1. A sheet feeding apparatus comprising:

the box body comprises an accommodating cavity;

the paper placing box is positioned in the accommodating cavity, and can be moved out of the accommodating cavity by pulling the paper placing box;

the regulating plate is positioned in the paper box, the position of the regulating plate in the paper box can be moved, and the regulating plate is suitable for regulating paper;

it is characterized by also comprising:

and the height limit display part is suitable for displaying the maximum allowable height of paper which can be placed in the paper placing box according to the position of the regulating plate.

2. The sheet feeding apparatus according to claim 1, wherein the height limit display portion is connected to the regulation plate, and when the regulation plate is moved in the horizontal direction, the height limit display portion is moved in the height direction to display a maximum allowable height at which different types of sheets can be placed in the cassette.

3. The sheet feeding apparatus according to claim 1, further comprising:

the paper information acquisition part is suitable for acquiring the paper information in the paper placing box;

and the calculation part calculates the maximum allowable height of paper which can be placed in the paper placing box according to the paper information acquired by the paper information acquisition part, and the height limit display part displays the calculated maximum allowable height.

4. The sheet feeding apparatus according to claim 3, wherein the regulation plates include side regulation plates located on both sides of the sheet and end regulation plates located at one end of the sheet; the paper information acquisition section includes:

the first sensing part is positioned on the side surface regulating plate and is suitable for sensing whether the side surface regulating plate is contacted with two sides of paper or not;

the first measuring part is used for obtaining the width information of the paper by measuring the distance between the side surface regulating plates when the first sensing part senses that the side surface regulating plates are contacted with the two sides of the paper;

the second sensing part is positioned on the end part regulating plate and is suitable for sensing whether the end part regulating plate is contacted with the end part of the paper or not;

the second measuring part is used for obtaining the length information of the paper by measuring the distance between the end regulating plate and the inner wall of the paper box when the second sensing part senses that the end regulating plate is contacted with the end part of the paper;

a level plateau amount acquiring section adapted to acquire sheet level plateau amount information.

5. The paper feeding apparatus according to claim 4, wherein the paper information acquiring section further includes: and the weight sensor is suitable for detecting the weight information of the current paper in the paper placing box.

6. The sheet feeding apparatus according to claim 5, further comprising:

the weight limiting part is suitable for calculating the maximum allowable weight of the paper sheets which can be placed in the paper placing box;

and an alarm unit configured to issue an alarm when the weight of the current paper detected by the weight sensor exceeds the maximum allowable weight calculated by the weight limiting unit.

7. The paper feeding device according to claim 5, wherein the bottom of the paper box is a supporting plate, and the supporting plate is movably connected with the inner wall of the paper box, and further comprising:

the lifting control part is suitable for controlling the pallet and the paper positioned on the pallet to move and lift;

a driving part adapted to supply a driving current to the rise control part;

and the current adjusting part is suitable for adjusting the driving current provided by the driving part according to the weight information of the current paper detected by the weight sensor.

8. The sheet feeding apparatus according to claim 3, further comprising: the regulating plates comprise side regulating plates and end regulating plates, the side regulating plates are positioned on two sides of the paper, and the end regulating plates are positioned at one end of the paper; the paper information acquisition section includes:

a first distance measuring unit for measuring the distance between the side regulating plates to obtain the width information of the paper;

a first button for pressing the first distance measuring unit to measure;

the second distance measuring part is used for measuring the distance between the end part regulating plate and the inner wall of the paper placing box to obtain the length information of the paper;

and a second button which is pressed to enable the second distance measuring part to measure.

9. The paper feeding apparatus according to any of claims 5 to 7, characterized in that the number of the weight sensors is plural; further comprising: a weight counting part adapted to count an average value of weight information of the current paper monitored by the plurality of weight sensors.

10. An image forming apparatus, characterized by comprising the sheet feeding apparatus according to claims 1 to 9.

Background

In the existing paper feeding apparatus, the paper feeding apparatus includes: the box, put paper box and cross the long-pending sensor of carrying. The box body comprises an accommodating cavity, the paper placing box is located in the accommodating cavity, and the paper placing box can be moved out of the accommodating cavity by pulling the paper placing box. The overload sensor is arranged at a fixed height position in the accommodating cavity, and the fixed height is a limit value calculated according to the maximum bearing capacity of paper of the maximum size type and the bottom metal plate.

The paper size that can be carried by the paper placing box has difference for different types of paper, namely the maximum allowable height that the paper can be placed in the paper placing box is different. Because the position of the overload sensor is fixed, the maximum height of the paper feeding device which allows the paper to be placed in the paper feeding device is difficult to adjust according to different paper types, the quantity of the small-size paper is too small, and the space in the paper box is not fully utilized.

Moreover, because the excessive load sensor is arranged in the accommodating cavity, only when the paper placing box is pushed into the accommodating cavity, the excessive load sensor can detect whether the height of the paper placing box exceeds the maximum allowable height. In order to stack the paper in the paper box to the maximum allowable height, the user needs to repeatedly push and pull the paper box to replenish the paper or take out the redundant paper, so that the operation is complicated, and the operation efficiency is low. In addition, the paper box is repeatedly pushed and pulled to cause the abrasion of the paper box, and the service life of the paper box is influenced.

Disclosure of Invention

The present invention has been made to solve the above problems, and an object thereof is to provide a paper feeding apparatus and an image forming apparatus having a high-precision and high-efficiency height limit display unit.

To solve the above problem, the present invention provides a paper feeding apparatus having: the box body comprises an accommodating cavity; the paper placing box is positioned in the accommodating cavity, and can be moved out of the accommodating cavity by pulling the paper placing box; the regulating plate is positioned in the paper box, the position of the regulating plate in the paper box can be moved, and the regulating plate is suitable for regulating paper; and the height limit display part is suitable for displaying the maximum allowable height of paper which can be placed in the paper placing box according to the position of the regulating plate.

Intensive studies by the inventors of the present invention have found that a regulating plate for regulating paper sheets, the regulating position of which differs for different paper sheet types, is provided in a paper feeding apparatus. The height limit display part displays the maximum allowable height of paper which can be placed in the paper box according to the position of the regulating plate, the accuracy is high, and the paper in the paper box can be effectively prevented from being overloaded.

In addition, when the paper placing box is moved out of the accommodating cavity, the height limit display part can also display the maximum allowable height of the paper to be placed, so that the operation is convenient, the operation efficiency is improved, the phenomenon that the paper placing box is in a closed state, overload is detected, the paper box is repeatedly pulled and pulled, and the damage to the paper placing box is reduced.

In the paper feeding device, the height limit display part is connected with the regulating plate, and when the regulating plate moves along the horizontal direction, the height limit display part moves along the height direction to display the maximum allowable height of different types of paper which can be placed in the paper placing box.

Therefore, as the regulating plate moves in the horizontal direction, the height limit display part moves in the height direction synchronously, and the maximum allowable height of the paper can be continuously displayed.

In the above paper feeding apparatus, further comprising: the paper information acquisition part is suitable for acquiring the paper information in the paper placing box; and the calculation part calculates the maximum allowable height of paper which can be placed in the paper placing box according to the paper information acquired by the paper information acquisition part, and the height limit display part displays the calculated maximum allowable height.

Therefore, in the state that the paper placing box is moved out of the accommodating cavity, the calculating part calculates the maximum allowable height of the paper placing box according to different paper types, and the accuracy can be further improved.

In the above sheet feeding apparatus, the regulating plates include side regulating plates located on both sides of the sheet and end regulating plates located at one end of the sheet; the paper information acquisition section includes: the first sensing part is positioned on the side surface regulating plate and is suitable for sensing whether the side surface regulating plate is contacted with two sides of paper or not; the first measuring part is used for obtaining the width information of the paper by measuring the distance between the side surface regulating plates when the first sensing part senses that the side surface regulating plates are contacted with the two sides of the paper; the second sensing part is positioned on the end part regulating plate and is suitable for sensing whether the end part regulating plate is contacted with the end part of the paper or not; the second measuring part is used for obtaining the length information of the paper by measuring the distance between the end regulating plate and the inner wall of the paper box when the second sensing part senses that the end regulating plate is contacted with the end part of the paper; a level plateau amount acquiring section adapted to acquire sheet level plateau amount information.

The first measuring part and the first sensing part are matched with the side surface regulating plate, so that the width information of the paper can be acquired; the second measuring part and the second sensing part are matched with the end part regulating plate, so that the length information of the paper can be acquired; the level mark amount acquisition unit may acquire sheet level mark amount information. Thus, the paper information acquiring unit can acquire the paper information in the paper receiving cassette.

In the above paper feeding apparatus, the paper information acquiring section further includes: and the weight sensor is suitable for detecting the weight information of the current paper in the paper placing box.

The weight sensor can acquire the weight information of current paper in the paper box, and the height of the current paper in the paper box can be acquired by combining the acquired paper length information, paper width information and paper level ground amount information, so that the height of the paper in the paper box can be conveniently monitored.

In the above paper feeding apparatus, further comprising: the weight limiting part is suitable for calculating the maximum allowable weight of the paper sheets which can be placed in the paper placing box; and an alarm unit configured to issue an alarm when the weight of the current paper detected by the weight sensor exceeds the maximum allowable weight calculated by the weight limiting unit.

Therefore, the alarm part can give an alarm when the weight of the current paper exceeds the maximum allowable weight so as to give a warning signal to a user, thereby preventing the paper in the paper box from being overloaded.

In above-mentioned paper feeding device, it is the layer board to put the carton bottom, the layer board with put carton inner wall swing joint, paper feeding device still includes: the lifting control part is suitable for controlling the pallet and the paper positioned on the pallet to move and lift; a driving part adapted to supply a driving current to the rise control part; and the current adjusting part is suitable for adjusting the driving current provided by the driving part according to the weight information of the current paper detected by the weight sensor.

Therefore, the driving current provided by the driving part for the rising control part has difference along with the different weight information of the current paper detected by the weight sensor, which is beneficial to reducing energy loss and achieving the purpose of energy saving.

In the above paper feeding apparatus, further comprising: the regulating plates comprise side regulating plates and end regulating plates, the side regulating plates are positioned on two sides of the paper, and the end regulating plates are positioned at one end of the paper; the paper information acquisition section includes: a first distance measuring unit for measuring the distance between the side regulating plates to obtain the width information of the paper; a first button for pressing the first distance measuring unit to measure; the second distance measuring part is used for measuring the distance between the end part regulating plate and the inner wall of the paper placing box to obtain the length information of the paper; and a second button which is pressed to enable the second distance measuring part to measure.

Prompting a first distance measuring part to measure the distance between the side surface regulating plates in a mechanical mode of pressing the first button so as to obtain paper width information; and the second distance measuring part is prompted to measure the distance between the end part regulating plate and the inner wall of the paper placing box in a mechanical mode of pressing the second button so as to obtain the length information of the paper, so that the production cost can be reduced.

In the above paper feeding apparatus, the number of the weight sensors is plural; further comprising: a weight counting part adapted to count an average value of weight information of the current paper monitored by the plurality of weight sensors.

Thus, the accuracy of the acquired current paper weight information can be improved.

Further, the paper feeding apparatus of the present invention can be applied to an image forming apparatus, and can thereby bring about the effects described above.

Drawings

FIG. 1 is a schematic view of an image forming apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a paper cassette of a paper feeding apparatus according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of the height limit display part shown in fig. 2;

fig. 4 is a comparison schematic diagram of different presentation situations of the LED light bar of the height-limiting display part shown in fig. 2.

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Further, it will be apparent to those skilled in the art that many alternatives thereof are possible in light of the above disclosure, and that the present invention is not limited to the preferred embodiments described herein.

Hereinafter, a specific configuration of the reading apparatus of the present invention will be described in detail.

Referring to fig. 1 and 2, a paper feeding apparatus 10 includes: the box body comprises an accommodating cavity; the paper placing box 100 is positioned in the accommodating cavity, and the paper placing box 100 can be moved out of the accommodating cavity by pulling the paper placing box 100; a regulating plate 200, wherein the regulating plate 200 is positioned in the paper placing box 100, and the position of the regulating plate 200 in the paper placing box 100 can be moved and is suitable for regulating paper; a height limit display part adapted to display a maximum allowable height of sheets that can be set in the paper setting box 100 according to a position of the regulation board 200.

As shown in fig. 1, the number of the paper feeding boxes 100 is one or more. In this embodiment, the number of the paper placing boxes 100 is plural.

As shown in fig. 2, the regulating positions of the regulating plate 200 differ for different paper types. The height limit display part displays the maximum allowable height of the paper placed in the paper placing box 100 according to the position of the regulating plate 200, has high accuracy, and can effectively prevent the paper in the paper placing box 100 from being overloaded. In addition, in the state that the paper box 100 is moved out of the accommodating cavity, the height limit display part can also display the maximum allowable height of the paper which can be placed, so that the operation is convenient, the operation efficiency is improved, and the phenomenon that the paper box 100 is repeatedly pulled and pulled when the paper box 100 is detected to be overloaded when the paper box 100 is in the closed state is avoided, so that the damage to the paper box 100 is reduced.

In this embodiment, the height limit display portion is connected to the regulating plate 200, and when the regulating plate 200 moves in the horizontal direction, the height limit display portion moves in the height direction to display the maximum allowable height at which different types of paper can be placed in the paper placing tray 100.

Thus, the height limit display unit moves in the height direction in synchronization with the movement of the regulating plate 200 in the horizontal direction, and the maximum allowable height at which the paper can be placed can be continuously displayed.

Referring to fig. 3, in the present embodiment, the height limit display portion includes: a limit marker 310 adapted to identify a height-limiting position; a transmission mechanism connecting the limit markers 310 and the regulation plate 200.

In this embodiment, the boundary indicator 310 has a plate shape, and the surface of the boundary indicator 310 is parallel to the surface of the bottom wall of the paper feeding cassette 100. When the limit marker 310 is plate-shaped, the limit marker 310 is disposed in the inner wall of the paper feeding cassette 100 to prevent the paper feeding device 10 from affecting the feeding of the paper. In other embodiments, the boundary marker 310 may also be in the form of a line, a bar, a rod, or a block.

In this embodiment, the regulating plate 200 has first and second opposing faces 201, which contact the paper during the regulation of the paper.

The transmission mechanism comprises a plurality of fixed pulleys and a connecting belt 330, one end of the connecting belt 330 is connected with the regulating plate 200, and the other end of the connecting belt is connected with the limit identification piece 310.

In this embodiment, the fixed pulley is located in the paper feeding box 100. The fixed pulleys comprise a first fixed pulley 321, a second fixed pulley 322, a third fixed pulley 323 and a fourth fixed pulley 324, wherein the first fixed pulley 321 and the second fixed pulley 322 are positioned in the bottom wall of the paper feeding box 100, and the rotating shafts of the first fixed pulley 321 and the second fixed pulley 322 are perpendicular to the surface of the bottom wall of the paper feeding box 100; the first face 201 faces the first fixed pulley 321, and the second face faces the second fixed pulley 322; the third fixed pulley 323 is positioned in the side wall of the paper discharge box 100, the circular surface of the third fixed pulley 323 is parallel to the second face, and the rotating shaft of the third fixed pulley 323 is perpendicular to the second face; the fourth fixed pulley 324 is positioned higher than the third fixed pulley 323, the circular surface of the fourth fixed pulley 324 is perpendicular to the second surface, and the rotation axis of the fourth fixed pulley 324 is parallel to the second surface.

In this embodiment, the connecting band 330 has a first end 331 and a second end 332 opposite to each other, the first end 331 is connected to the bottom end of the gauge plate 200, and the second end 332 is connected to the limit marker 310. From the first end 331 to the second end 332, the connecting belt 330 passes through the first fixed pulley 321, the second fixed pulley 322, the third fixed pulley 323 and the fourth fixed pulley 324 in sequence.

In this embodiment, the regulating plate 200 moves between the first fixed pulley 321 and the second fixed pulley 322 in the x-axis direction. When the regulation plate 200 moves toward the first fixed pulley 321, the limit marker 310 moves downward. When the regulation plate 200 moves toward the second fixed pulley 322, the limit marking member 310 moves upward.

As shown in fig. 2, the height limit display unit further includes: a guide 340, the guide 340 being adapted to limit a moving path of the connection band 330.

As shown in fig. 3, in this embodiment, the connecting strip 330 has a first connecting surface and a second connecting surface opposite to each other, the first connecting surface is green, and the second connecting surface is red. The second connection surface of the connection belt 330 between the fourth fixed pulley 324 and the limit marker 310 faces outward, and the first connection surface faces inward. The first connection surface of the connection belt 330 between the fourth fixed pulley 324 and the third fixed pulley 323 faces outward, and the second connection surface faces inward. The inside and outside are defined based on the orientation of the regulating plate 200, the connecting surface facing the regulating plate 200 is an outwardly facing connecting surface, and the connecting surface facing away from the regulating plate 200 is an inwardly facing connecting surface.

As the limit marker 310 descends, the length of the second connecting surface exposed outward in red gradually increases and the length of the first connecting surface exposed between the limit marker 310 and the third fixed pulley 323 in green gradually decreases when the limit marker 310 is viewed from the regulating plate 200 in the opposite direction to the x-axis.

As the limit marker 310 ascends, the length of the second connecting surface exposed outward in red is gradually decreased and the length of the first connecting surface exposed between the limit marker 310 and the third fixed pulley 323 in green is gradually increased when the limit marker 310 is viewed from the regulating plate 200 in the opposite direction of the x-axis.

When the limit indicator 310 is viewed from the regulating plate 200 along the x-axis, the second connecting surface exposed outward in red color indicates that the corresponding height area can not be used for placing paper, and the first connecting surface exposed between the limit indicator 310 and the third fixed pulley 323 in green color indicates that the corresponding height area can be used for placing paper. The boundary indicator 310 is the intersection of two areas, and the position of the boundary indicator 310 is the maximum allowable height of the paper placed in the paper placing box 100.

As shown in fig. 2, when the regulation board 200 is located at (x0, 0, 0) in the xyz coordinate system, the coordinate position of the limit marker 310 is (0, 0, h 0); when the regulation board 200 is moved to (x1, 0, 0), the coordinate position of the limit marker 310 is (0, 0, h 1); when the regulation board 200 is moved to (x2, 0, 0), the coordinate position of the limit marker 310 is (0, 0, h 2); when the regulation board 200 is moved to (x3, 0, 0), the coordinate position of the limit marker 310 is (0, 0, h 3). Wherein x0, x1, x2 and x3 are sequentially increased, and h0, h1, h2 and h3 are sequentially decreased.

Fig. 4 is a comparison schematic diagram of different presentation situations of the LED light bar of the height-limiting display part shown in fig. 2. The leftmost rectangular frame represents the inner wall of the paper placing box 100, and shows the side projection of the LED light bar, and the right four rectangular frames respectively show four different display conditions of the front projection of the LED light bar.

In another embodiment, as shown in fig. 4, the height limit display part further includes: the LED light bar extends along the z-axis direction, and is arranged on the inner wall of the paper placing box 100, or is arranged on the guide rail 340. The LED light bar above the boundary marker 310 is a first color, and the LED light bar below the boundary marker 310 is a second color, which is different from the first color. The LED lamp strip is characterized in that the whole LED lamp strip presents a first color elongated strip area and a second color elongated strip area which extend along the z-axis direction, and the height of the junction of the first color elongated strip area and the second color elongated strip area is the same as the height of the regulation plate 200. The second color elongated strip area shows an allowable height of the placeable paper, and the first color elongated strip area corresponds to the non-placeable paper at the height.

The second color is different from the first color, e.g., the first color is red and the second color is green.

In addition, the on/off of the LED light bar above or below the limit marker 310 can be controlled to display the unreleasable paper segment and the releasable paper segment.

In another embodiment, the paper feeding apparatus 10 further includes: a paper information acquisition section adapted to acquire information on the paper in the paper feed tray 100; and a calculation unit that calculates a maximum allowable height at which sheets can be placed in the sheet placing tray 100 based on the sheet information acquired by the sheet information acquisition unit, and the height limit display unit displays the calculated maximum allowable height.

Therefore, in the state that the paper placing box 100 is moved out of the accommodating cavity, the calculating part calculates the maximum allowable height of the paper to be placed according to different paper types, and the accuracy can be further improved.

The regulating plate 200 includes a side regulating plate and an end regulating plate, the side regulating plate is located at both sides of the paper, and the end regulating plate is located at one end of the paper.

The paper information acquisition section includes: the first sensing part is positioned on the side surface regulating plate and is suitable for sensing whether the side surface regulating plate is contacted with two sides of paper or not; the first measuring part is used for obtaining the width information of the paper by measuring the distance between the side surface regulating plates when the first sensing part senses that the side surface regulating plates are contacted with the two sides of the paper; the second sensing part is positioned on the end part regulating plate and is suitable for sensing whether the end part regulating plate is contacted with the end part of the paper or not; the second measuring part is used for obtaining the length information of the paper by measuring the distance between the end regulating plate and the inner wall of the paper placing box 100 when the second sensing part senses that the end regulating plate is contacted with the end of the paper; a level plateau amount acquiring section adapted to acquire sheet level plateau amount information.

The first measuring part and the first sensing part are matched with the side surface regulating plate, so that the width information of the paper can be acquired; the second measuring part and the second sensing part are matched with the end part regulating plate, so that the length information of the paper can be acquired; the level mark amount acquisition unit may acquire sheet level mark amount information. Thus, the sheet information acquiring portion can acquire the sheet information in the sheet cassette 100.

Wherein, the maximum weight of the paper that can be borne by the paper feeding cassette 100 is G (in grams), the width of the paper measured and obtained by the first measuring portion is W1 (in meters), the width of the paper measured and obtained by the second measuring portion is L1 (in meters), the information of the amount of paper flatting obtained by the flatting amount obtaining portion is δ 1 (in grams per square meter), and then the maximum number z of the paper that can be placed in the paper feeding cassette 100 is:

z＝G/(W1×L1×δ1)；

the maximum height H1 of the paper placed in the paper placing box 100 is as follows:

H1＝z×W1；

w1 is the thickness of a single sheet.

In another embodiment, the paper information acquiring section further includes: a weight sensor adapted to detect weight information of the current paper in the paper feeding cassette 100.

The weight sensor can acquire the weight information of the current paper in the paper placing box 100, and the height of the current paper in the paper placing box 100 can be acquired by combining the acquired paper length information, paper width information and paper level ground amount information, so that the height of the paper in the paper placing box 100 can be conveniently monitored.

The current paper weight in the paper box 100 obtained by the weight sensor is G1, and the height of the current paper in the paper box 100 is H11, wherein:

H11＝(G1×H1)/G；

the number of the weight sensors is one or more. When the number of the weight sensors is plural, the paper feeding apparatus 10 further includes: a weight counting part adapted to count an average value of weight information of the current paper monitored by the plurality of weight sensors.

The weight counting part can improve the accuracy of the obtained weight information of the current paper by counting the average value of the weight information displayed by the weight sensors, and is favorable for improving the accuracy of the obtained height information of the current paper.

The height limit display part further includes: the LED lamp bank comprises a plurality of LED lamps, the LED lamps are arranged on the inner side wall of the paper placing box 100 at equal intervals along the height direction, and the LED lamps extend from the bottom wall of the paper placing box 100 to the top wall of the paper placing box 100. From the bottom wall to the top wall of the paper placing box 100, the serial numbers of the LED lamps are 1, 2 and 3 … X in sequence, wherein X is the serial number of the LED lamp located at the top wall of the paper placing box 100.

The height of the paper placing box 100 is D, and the serial number of the LED lamp at the maximum allowable height of paper placed in the paper placing box 100 is X1:

X1＝(X×H1)/D；

the serial number of the LED lamp at the height of the current paper in the paper placing box 100 is X11:

X11＝(X1×H11)/H1；

the height limit display part further includes: and the lamp control part is suitable for controlling the on and off of the LED lamp set.

In the process of putting paper into the paper putting box 100, the light control part regulates and controls the LED lamp group, so that the LED lamps with the serial numbers of X11-X1 are in a light-on state, and the rest of the LED lamps are in a light-off state. As a user puts paper into the paper box 100, the number of the LED lamps in the on state is gradually reduced until all the LED lamps are turned off, and at this time, the height of the paper in the paper box 100 reaches the maximum allowable height.

The paper feeding apparatus 10 further includes: a weight limiting section adapted to calculate a maximum allowable weight of sheets that can be set in the sheet setting tray 100; and an alarm unit configured to issue an alarm when the weight of the current paper detected by the weight sensor exceeds the maximum allowable weight calculated by the weight limiting unit.

Thus, the alarm portion can give an alarm when the weight of the current paper exceeds the maximum allowable weight to give a warning signal to the user, thereby preventing the paper in the paper feeding cassette 100 from being overloaded.

The quantity of weight sensor is a plurality of, helps improving the accuracy of the current paper weight information who obtains, is favorable to making the opportunity that alarm portion sent out the police dispatch newspaper is more accurate.

In this embodiment, the bottom of the paper feeding box 100 is a supporting plate, the supporting plate is movably connected to the inner wall of the paper feeding box 100, and the paper feeding device 10 further includes: the lifting control part is suitable for controlling the pallet and the paper positioned on the pallet to move and lift; a driving part adapted to supply a driving current to the rise control part; and the current adjusting part is suitable for adjusting the driving current provided by the driving part according to the weight information of the current paper detected by the weight sensor.

Therefore, the driving current provided by the driving part for the rising control part has difference along with the different weight information of the current paper detected by the weight sensor, which is beneficial to reducing energy loss and achieving the purpose of energy saving.

When the weight of the paper in the paper box 100 reaches the maximum weight G, the driving current provided by the driving part is I. In the process of putting paper into the paper box 100, the weight of the current paper in the paper box 100 acquired by the weight sensor is G1, and the driving current provided by the driving part is I1:

I1＝(G1×I)/G。

the number of the weight sensors is multiple, and the weight counting portion can improve the accuracy of the obtained current paper weight information by counting the average value of the weight information displayed by the weight sensors, so that the driving current provided by the driving portion is more accurate and appropriate.

In still another embodiment, the method further comprises: the regulating plates 200 include side regulating plates located at both sides of the paper and end regulating plates located at one end of the paper; the paper information acquisition section includes: a first distance measuring unit for measuring the distance between the side regulating plates to obtain the width information of the paper; a first button for pressing the first distance measuring unit to measure; a second distance measuring part for measuring the distance between the end regulating plate and the inner wall of the paper placing box 100 to obtain the length information of the paper; and a second button which is pressed to enable the second distance measuring part to measure.

Prompting a first distance measuring part to measure the distance between the side surface regulating plates in a mechanical mode of pressing the first button so as to obtain paper width information; the second distance measuring part is prompted to measure the distance between the end regulating plate and the inner wall of the sheet discharge box 100 in a mechanical manner of pressing the second button to obtain the sheet length information, whereby the production cost can be reduced.

As shown in fig. 1, the present invention also provides an image forming apparatus 1 including the above-described paper feeding apparatus 10.

The above-described paper feeding apparatus 10 can be applied to an image forming apparatus, and can thereby bring about the effects as described above.

The image forming apparatus 1 further includes: a conveying section 30 including a plurality of sets of conveying roller pairs adapted to convey a sheet along a predetermined conveying path; a transfer section 31 adapted to transfer toner onto a sheet; and a fixing section 32 adapted to perform a fixing process on the paper.

The image forming apparatus 1 further includes: a display unit 20 adapted to display the operating states of the paper feeding device 10, the conveying unit 30, the transfer unit 31, and the fixing unit 32, and to display an operation instruction of an operator; and an operation panel 21 adapted for an operator to input an operation instruction.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.