CN1178795C - Paper pickup unit in paper feeder - Google Patents

Abstract

The invention provides a paper pick-up device in a paper feeding box with a top plate. In this paper pick-up device, a compressed coil spring is arranged under the top plate, which is used to press the top plate upwards and provide paper pick-up force, and a hinge shaft is rotatably connected to two sides of the paper supply box through a hinge on the side wall. An auxiliary plate provided under the top plate extends from the hinge shaft portion, and means for pressing the auxiliary plate upward is installed at the front of the paper supply cassette to press upward the compressed coil spring.

Description

Paper pickup unit in paper feeder

technical field

The present invention relates to a paper feeding cassette in a laser printer (LBP) utilizing an electrostatic developing method, and more particularly to a paper pick-up device capable of keeping a stack of paper always at a position where it can be picked up.

Background technique

Electrostatic imaging is commonly used in printers, copiers, LBPs, facsimile machines, and the like. The above-mentioned device is equipped with a paper feed cassette for accommodating a plurality of sheets, and the paper feed cassette has a paper pickup device capable of keeping a stack of paper always in a position where it can be picked up.

Fig. 1 is a perspective view of a conventional paper feeding cassette. As shown in FIG. 1 , a conventional paper feeding cassette is of a general type and includes at least one of a guide plate 201 and a guide plate 202 for adjusting the positions of papers with different lengths and widths so as to accommodate papers of different sizes. The paper supply cassette 200 includes a top plate 203 for loading paper, and the top plate 203 is elastically supported by one or more compression coil springs 204 . The compression coil spring 204 presses the top plate 203 upwards so that the paper on the top plate 203 is in a position where it can be picked up. Under the action of a pick-up roller (not shown) and a pointer (not shown), paper is fed one by one from the top plate 203 to registration rollers (not shown). As the pickup roller rotates, the topmost paper in the stack remains in contact with the pickup roller and is transported by friction between the paper and the pickup roller.

In the above structure, the paper feeding cassette 200 supplies papers of various sizes (eg, A4 size, letter size, OHP film size) as recording media. All kinds of paper not only have different sizes and thicknesses, but also have different weights.

The mechanism for setting the pick-up position utilizes one or two compressed coil springs under the top plate 203, and this mechanism cannot handle papers of different weights. In addition, depending on the type of paper, different loads are applied to a universal paper feeder that can accommodate up to 500 sheets. Compared with A4 paper and A6 paper, the load applied to the paper tray by A6 paper is greater than the load applied to the paper tray by A4 paper. The difference in pickup force makes paper feeding unreliable.

Japanese Patent Application JP-A-9-30663 discloses a paper feeding device, but it fails to solve the above-mentioned problems.

Contents of the invention

Therefore, an object of the present invention is to provide a paper pick-up device in a paper feeding cassette, which can reliably pick up papers of different sizes and weights.

Another object of the present invention is to provide a paper pickup device in the paper supply box, the device can control the magnitude of the paper pickup force.

Another object of the present invention is to provide a paper pickup device in the paper supply box, the user can control the magnitude of the paper pickup force of the device through simple operations.

According to the present invention, a paper pick-up device in a paper feeding box with a top plate includes: a compression coil spring arranged under the top plate, which is used to press the top plate upwards and provide paper pickup force; a hinge shaft, The shaft is rotatably connected to the side walls of the paper supply box by hinges; a curved groove is formed in the front of each side wall of the paper supply box; In the curved groove on the front of the box; a hinge shaft, which is rotatably connected to both side walls of the paper supply box by a hinge; an auxiliary plate provided under the top plate, which extends from the hinge shaft ; a connecting part, which extends from each end of the hinge shaft to a certain length along a direction perpendicular to the auxiliary plate, and a driving part is provided at the end of the part; an elastic part, one end of which is connected to each end of the shaft, Its other end is connected to the drive portion of each link so that the shaft and link are in tension with each other.

Another paper pick-up device in a paper feeding cassette with a top plate according to the present invention includes: a compression coil spring arranged under the top plate, which is used to press the top plate upward and provide paper pickup force; the first curved groove, The groove is formed at the front of each side wall of the paper supply cassette; a shaft, both ends of which are protrudingly inserted into the curved groove on the front of the paper supply cassette; a hinge shaft, which is rotatably connected by a hinge On both side walls of the paper supply box; an auxiliary plate provided under the top plate, the auxiliary plate extending from the hinge shaft portion; a connecting part, which runs from each end of the hinge shaft in a direction perpendicular to the auxiliary plate Extending to a certain length, a first drive portion is provided on one end of the member, and a second drive portion is provided on the other end of the member; a first elastic member, one end of which is connected to each end of the shaft, and the other end Connected to the first drive portion of each connecting member so that the shaft and connecting member are in tension with each other; a second curved slot formed in each side wall of the paper supply cassette; one located inside the paper supply cassette a fixed part; a lever, which is bent into two parts, one lever end of the lever is protrudingly inserted into the second groove, and the other lever end is rotatably connected with the fixed part through a hinge; one is located near the second groove A braking device, which is used to stop the movement of the lever end; a second elastic member, one end of which is connected to the second driving part of a connector, and the other end is connected to the lever end, so that the shaft and the connecting part exist between each other tension.

Another paper pick-up device in a paper feeding cassette with a top plate according to the present invention includes: a compression coil spring arranged under the top plate, which is used to press the top plate upward and provide paper pickup force; the first bending a groove formed at the front of each side wall of the paper feeding cassette; a hinge shaft rotatably connected to both side walls of the paper feeding cassette by a hinge; an auxiliary plate provided under the top plate, the An auxiliary plate extends from the hinge shaft portion; a device provided at the front of the paper feed cassette for pressing up the auxiliary plate to increase the upward pressure of the compression coil spring.

The above-mentioned objects and advantages of the present invention will become clearer by describing in detail the preferred embodiments of the present invention with reference to the accompanying drawings.

Description of drawings

Figure 1 is a perspective view of a conventional paper feeding cassette;

Figure 2 is a perspective view of a paper supply cassette in one embodiment of the present invention;

Fig. 3 is the schematic perspective view of the paper pick-up device in an embodiment of the present invention;

Figure 4 is a partial side view of the paper pickup device in one embodiment of the present invention, for explaining the position of the shaft when the tension coil spring is not tensioned;

Figure 5 is a partial side view of the paper pick-up device in one embodiment of the present invention, used to explain the position of the shaft when the tension coil spring is tensioned;

Figure 6 is a perspective view of a paper feeding cassette in another embodiment of the present invention;

7 is a schematic perspective view of a paper pickup device in a second embodiment of the present invention;

8 is a partial side view of the paper pickup device in the second embodiment of the present invention, for explaining the position of the shaft and the lever when the first tension coil spring and the second tension coil spring are not tensioned;

9 is a partial side view of the paper pickup device in the second embodiment of the present invention, for explaining the position of the shaft and the lever only when the first tension coil spring is tensioned;

10 is a partial side view of the paper pickup device in the second embodiment of the present invention, for explaining the position of the shaft and the lever when both the first tension coil spring and the second tension coil spring are tensioned.

Detailed ways

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It is worth noting that in the drawings, the same reference numerals represent the same components, and at the same time, for the sake of clarifying the subject matter of the present invention, detailed descriptions of known related functions or structures in the present invention are omitted.

Fig. 2 is a perspective view of a paper feeding cassette in an embodiment of the present invention; Fig. 3 is a schematic perspective view of a paper pickup device in an embodiment of the present invention.

Referring to FIG. 2 , the paper pickup device is disposed in the front portion 14 of the paper supply cassette 10 , and the top plate 13 is mounted on the bottom surface of the paper supply cassette 10 and can rotate relative to one side of the paper supply cassette 10 . One or more guide plate parts 11 and guide plate parts 12 are installed in the paper feeding cassette 10, and the guide plate parts 11 and guide plate parts 12 can move along the paper feeding direction and perpendicular to the paper feeding direction respectively, so as to adjust the different lengths and widths respectively. position of the paper.

A curved groove 16 is formed on the front of each side wall 15 of the paper feeding cassette 10 so as to movably insert the shaft 20 therein. A hinge hole for inserting a hinge shaft 30 is formed on one side of each bending groove 16 . Both ends of the curved groove 16 are in the shape of a circle, and the diameter of the circle is larger than the width of the curved groove 16 so as to position the shaft 20 .

Referring now to FIG. 3 , both ends of the hinge shaft 30 rotatably extend through the hinge holes on the pickup device. An auxiliary plate 31 is provided below the top plate 13, and the auxiliary plate 31 extends from the hinge shaft 30 along the paper feeding direction. The connecting part 32 vertically extends from both ends of the hinge shaft 30, and the connecting part 32 acts as a lever to press the auxiliary plate 31 upward, and is formed with a driving part 33 at one end thereof. That is, the auxiliary plate 31 , the connecting member 32 and the driving portion 33 are all integrally formed with the hinge shaft 30 .

A shaft of a certain length is inserted into the curved groove 16 on the side walls 15 of the paper cassette 10 shown in FIG. In order to prevent the shaft 20 from detaching from the curved groove 16 , an assembly groove 21 with a certain depth is formed on the outer circumference of each end of the shaft 20 , so that the shaft 20 is fixed in the curved groove 16 . Therefore, the shaft 20 is movable along the curved groove 16 under the operation of the user.

The elastic member connects the end of the shaft 20 to the drive portion 33 of the connecting member 32 so that the shaft 20 and the connecting member 32 are in tension with each other. In the present invention, a tension coil spring 40 is used as the elastic member.

In the paper pickup device described above, the user moves the shaft 20 in the curved groove 16 along the direction indicated by the arrow A in FIG. Therefore, the upward pressure applied to the top plate 13 by the auxiliary plate 31 changes in the direction indicated by the arrow B in FIG. 3 with respect to the hinge shaft 30 integrally formed with the lower end of the connecting member 32 .

4 is a partial side view of the paper pickup device in the first embodiment of the present invention, for explaining the position of the shaft when the tension coil spring is not tensioned;

As shown in Figure 4, when the shaft 20 is in the position a of the curved groove 16 on the side wall of the paper feeder, the stack of papers pushes down the top plate 13, but the tension coil spring 40 is not tensioned and only the tension under the top plate 13 The upward pressure of a pressure spring (not shown) is applied to the top plate 13 . In this case, the paper load is small.

Fig. 5 is a partial side view of the paper pickup device in the first embodiment of the present invention, for explaining the position of the shaft when the tension coil spring is tensioned.

When the shaft 20 is in position b of the curved slot 16 as shown in FIG. 5 , the stack of papers depresses the top plate 13 . In this way, the connecting part 32 moves around the hinge shaft 30, and the tension coil spring 40 has a certain tension. In this way, the pressure spring presses the top plate 13 upwards by means of the auxiliary plate 31 . In this case, the paper load is large.

In the first embodiment of the present invention, the auxiliary plate presses the top plate 13 upward in one step.

In a second embodiment of the invention, the auxiliary plate is operated in two steps by means of at least two elastic members, preferably tension coil springs.

Fig. 6 is a perspective view of a paper feeding cassette in a second embodiment of the present invention; Fig. 7 is a schematic perspective view of a paper pickup device in a second embodiment of the present invention.

As shown in FIG. 6 , the paper pickup device is disposed in the front portion 114 of the paper supply cassette 100 , and the top plate 113 is mounted on the bottom surface of the paper supply cassette 100 and can rotate relative to one side of the paper supply cassette 100 . One or more guide plate members 111 and guide plate members 112 are installed in the paper supply cassette 100. The guide plate members 111 and guide plate members 112 can move along the paper feeding direction and perpendicular to the paper feeding direction respectively, so as to adjust the paper with different lengths and widths respectively. position of the paper.

A first groove 116 having a certain curvature is formed on the front of each side wall 115 of the paper feeding cassette 100 so as to movably insert the shaft 120 therein. A hinge hole for inserting one end of the hinge shaft 130 is formed on one side of each groove 16 . Both ends of the slot 16 are in the shape of a circle, and the diameter of the circle is greater than the width of the first slot 116 for positioning the shaft 120 . In addition, the second groove 117 having a certain curvature is formed above the first groove 116 on the side wall 115 of the paper feeding cassette 100 , and both ends of the second groove 117 are also circular.

A locking device 170 with a certain shape is arranged above the second groove 117 to ensure that the locking device 170 rotates around the hinge shaft 171 and covers the bottom of the second groove 117. When the locking device 170 covers the locking In the lower part of the device 170 , the detent 173 protrudes from the second slot 117 to limit the rotation of the locking device 170 . That is, the locking device 170 is configured so that it can move freely around the hinge shaft 171 and is fixed by the stopper 173 to partially cover the second slot 117 . For the convenience of users to operate, a knob 172 protrudes from the outer surface of the locking device 170 .

Referring now to FIG. 7 , both ends of the hinge shaft 130 are rotatably extended through the hinge holes on the pickup device. An auxiliary plate 131 is provided below the top plate 13, and the auxiliary plate 131 extends from the hinge shaft 130 along the paper feeding direction. Connecting part 132 vertically extends from each of the two end portions of hinge shaft 130, and this connecting part 132 presses up auxiliary plate 131 as a lever, and this connecting part 132 is formed with a first driving part 133 and a slave from one end thereof. The second driving part 134 extends from the first driving part 133 . That is, the auxiliary plate 131 , the connecting part 132 , the first driving part 133 , and the second driving part 134 are all integrally formed with the hinge shaft 130 .

Both ends of the shaft 120 of a certain length are inserted into the first grooves 116 on the side walls 115 of the paper cassette 100 shown in FIG. In order to prevent the shaft 120 from disengaging from the first groove 116 , an assembly groove 121 with a certain depth is formed on the outer circumference of each end of the shaft 120 , so that the shaft 120 is fixed in the first groove 116 . Therefore, the shaft 120 can move along the curved first groove 116 under the user's operation.

The first elastic member connects the end of the shaft 120 with the first driving portion 133 of each connecting member 132 so that the shaft 120 and the connecting member 132 are in tension with each other. In the present invention, a tension coil spring 140 is used as the first elastic member.

On one side of the auxiliary plate 131 is provided a lever 150 bent at an angle into two parts. One end 151 of the lever 150 is protrudingly inserted into the second groove 117 , and the other end 152 of the lever 150 is rotatably connected with the fixing member 160 . Accordingly, lever end 151 rotates relative to lever end 152 . The lever end 151 and the lever end 152 of the lever 150 have a circular section so as to move or rotate.

The second elastic member connects the lever end 151 with the second driving portion 134 of the connecting member 132 so that the lever 150 and the connecting member 132 have tension between each other. The second elastic member is preferably a tension coil spring, see the second tension coil spring 141 used as the second elastic member below.

In the paper pickup device described above, the user moves the shaft 120 in the first slot 116 in the direction indicated by arrow A in FIG. Simultaneously, when the lever end 151 protruding from the second groove 117 moves in the direction indicated by the arrow C in FIG. 7 , the tension applied to the connecting member 132 changes again. In this way, the change of the upward pressure exerted by the auxiliary plate 131 on the top plate 113 can be carried out in two steps along the direction indicated by the arrow B in FIG. 7 .

8 is a partial side view of the paper pickup device in the second embodiment of the present invention, for explaining the position of the shaft and the lever when neither the first tension coil spring nor the second tension coil spring is tensioned;

As shown in Figure 8, when the shaft 120 is at the a position of the first groove 116 on the side wall of the paper feeding cassette and the lever end 151 is at the c position of the second groove 117, the stack of papers pushes down the top plate 113, however, the second Neither the first tension coil spring 140 nor the second tension coil spring 141 is in a tensioned state but only the upward pressure of a pressure spring (not shown) disposed under the top plate 113 is applied to the top plate 113 . In this case, the paper load is small.

Fig. 9 is a partial side view of the paper pickup device in the second embodiment of the present invention, for explaining the position of the shaft and the lever only when the first tension coil spring is tensioned.

As shown in Figure 9, when the shaft 20 is in the b position of the first groove 116 and the lever end 151 is in the c position of the second groove 117, the stack of papers depresses the top plate 113, so that the connecting part 132 moves around the hinge shaft 130 , only the first tension coil spring 140 has a certain tension. In this way, on the basis of the upward pressure of the pressure spring, the auxiliary plate 131 applies a certain force to the top plate 113 . In this case, the paper load is larger than that in FIG. 8 .

10 is a partial side view of the paper pickup device in the second embodiment of the present invention, for explaining the position of the shaft and the lever when both the first tension coil spring and the second tension coil spring are tensioned.

As shown in Figure 10, when the shaft 20 is in the b position of the first groove 116 and the lever end 151 is in the d position of the second groove 117, the stack of papers has depressed the top plate 113. Like this, the first tension coil spring 140 and the second The two tension coil springs 141 apply tension to the connecting part 132 at the same time. In this way, the force applied to the top plate 113 by the auxiliary plate 131 is greater than the force applied to the top plate 113 by the auxiliary plate 131 in FIG. 9 . In this case, the paper load is larger than that in FIG. 9 .

In FIG. 10 , when the lever end 151 moves to the position d of the second slot 117 , the lever end 151 pushes one end of the locking device 170 , and then the locking device 170 rotates around the hinge shaft 171 . Finally, the lever end 151 is set in the position d of the second slot 117 , and the locking device 170 returns to its initial position when the movement of the locking device 170 is restricted by the stopper 173 . The lever end 151 is in this position under the restriction of the locking device 170 and the stopper 173 , and is tensioned by the second tension coil spring 141 at the same time. On the other hand, in order to move the lever end 151 to the position c of the second slot 117 , the user can use the knob 172 to rotate the locking device 170 counterclockwise by a certain angle. Then, under the tension of the second tension coil spring 141 , the lever end 151 is moved to the position c of the second slot 117 , and the second tension coil spring 141 returns to the relaxed state.

In the second embodiment of the present invention, the user can increase the pressure applied to the top plate 113 by controlling the shaft 120 projectingly inserted into the first slot 116 and the lever end 151 projecting through the second slot 117 .

As described above, the present invention is advantageous in that the user can control the paper pickup force according to the paper loads of different sizes and quantities in the paper feed cassette of the LBP.

Although the present invention has been described in detail with reference to the embodiment, the foregoing is only an example. Therefore, for those skilled in the art, there are still many modifications within the protection scope of the present invention.

Claims (21)

1. the paper twisting device in the sheet feed cassette that has a top board comprises:

A coil compression springs of being located under the top board, this wind spring are used for upwards having pressed top board and paper-rubbing force being provided;

A hinge axis, this rotatably is connected on the two side of sheet feed cassette by hinge;

A curved slot, this groove is formed at the front portion of each sidewall of sheet feed cassette;

An axle, the curved slot on the front portion that is arranged in sheet feed cassette is inserted at its two ends highlightedly;

A hinge axis, this rotatably is connected on the two side of sheet feed cassette by hinge;

An accessory plate of being located under the top board, this accessory plate is from the extension of hinge axial region;

A link, these parts extend to certain-length from every end of hinge axis along the direction perpendicular to accessory plate, are provided with drive part at this ends;

An elastomeric element, the one end links to each other with each end of axle, and its other end links to each other with the drive part of each link, so that there are tensile force to each other in axle and link.

2. paper twisting device according to claim 1, wherein this elastomeric element is a tension coil springs.

3. paper twisting device according to claim 1 wherein for preventing that axle breaks away from from curved slot, is formed with the fitting recess of certain depth on the excircle of each end of edge axle.

4. paper twisting device according to claim 1, wherein the both ends of curved slot are round shape, this circle diameter greater than the width of curved slot, so that axle easily can be moved and is fixed in the groove.

5. the paper twisting device in the sheet feed cassette that has a top board comprises:

Be located at the coil compression springs under the top board, this wind spring is used for upwards having pressed top board and paper-rubbing force being provided;

First curved slot, this groove is formed at the front portion of each sidewall of sheet feed cassette;

An axle, the curved slot on the front portion that is arranged in sheet feed cassette is inserted at its two ends highlightedly;

A hinge axis, this rotatably is connected on the two side of sheet feed cassette by hinge;

An accessory plate of being located under the top board, this accessory plate is from the extension of hinge axial region;

A link, these parts extend to certain-length from every end of hinge axis along the direction perpendicular to accessory plate, are provided with first drive part on an end of these parts, are provided with second drive part on the other end of these parts;

One first elastomeric element, the one end links to each other with every end of axle, and its other end links to each other with first drive part of each link, so that there are tensile force to each other in axle and link;

Second curved slot, this groove are formed on each sidewall of sheet feed cassette;

A fixed parts that is positioned at sheet feed cassette;

A lever, this lever are bent to two parts, and a lever end of lever is inserted in second groove highlightedly, and another lever end rotatably is connected with fixed parts by hinge;

A near brake equipment that is located at second groove, this device is used to stop the motion of lever end;

One second elastomeric element, the one end links to each other with second drive part of an adaptor union, and its other end links to each other with lever end, so that there are tensile force to each other in axle and link.

6. paper twisting device according to claim 5, wherein this first, second elastomeric element is tension coil springs.

7. paper twisting device according to claim 5 wherein for preventing that axle breaks away from from first curved slot, is formed with the fitting recess of certain degree of depth on the excircle of each end of edge axle.

8. paper twisting device according to claim 5, wherein the both ends of first curved slot are round shape, this circle diameter greater than the width of first curved slot, so that axle easily can be moved and is fixed in first groove.

9. paper twisting device according to claim 5, wherein brake equipment comprises:

A locking device, this locking device are installed in the top of second groove on the sidewall of sheet feed cassette by hinge, be used for covering partly second groove; With

A drg of giving prominence to from second groove below is used to limit the rotation of locking device.

10. paper twisting device according to claim 9, wherein this locking device comprises a knob, this knob outwards is arranged on the outside face of locking device highlightedly, so that the user operates.

11. the paper twisting device in the sheet feed cassette that has a top board comprises:

A coil compression springs of being located under the top board, this wind spring are used for upwards having pressed top board and paper-rubbing force being provided;

First curved slot, this groove is formed at the front portion of each sidewall of sheet feed cassette;

A hinge axis, this rotatably is connected on the two side of sheet feed cassette by hinge;

An accessory plate of being located under the top board, this accessory plate is from the extension of hinge axial region;

A front portion that is arranged on sheet feed cassette is used for upwards having pressed the device of accessory plate, to increase the upward pressure of coil compression springs.

12. paper twisting device according to claim 11, wherein this pressure device comprises:

A curved slot, this groove are formed on the front portion of each sidewall of sheet feed cassette;

An axle, the curved slot on the front portion that is arranged in sheet feed cassette is inserted at its two ends highlightedly;

A link, these parts are provided with a drive part along perpendicular to the every end extension from hinge axis of the direction of accessory plate on an end of these parts;

One first elastomeric element, the one end links to each other with every end of axle, and its other end links to each other with the drive part of each link, so that there are tensile force to each other in axle and link.

13. paper twisting device according to claim 12, wherein this elastomeric element is a tension coil springs.

14. paper twisting device according to claim 12 wherein for preventing that axle breaks away from from this curved slot, is formed with the fitting recess of certain depth on the excircle of each end of edge axle.

15. paper twisting device according to claim 12, wherein the both ends of this curved slot form round shape, this circle diameter greater than the width of this curved slot, so that axle easily can be moved and is fixed in this groove.

16. paper twisting device according to claim 11, wherein this pressure device comprises:

First curved slot, this groove are formed on the front portion of each sidewall of sheet feed cassette;

An axle, the curved slot on the front portion that is positioned at sheet feed cassette is inserted at its two ends highlightedly;

A link, these parts extend along the direction perpendicular to accessory plate from every end of hinge axis, are provided with one first drive part on an end of these parts, and the other end is provided with one second drive part;

One first elastomeric element, the one end links to each other with every end of axle, and its other end links to each other with first drive part of each link, so that there are tensile force to each other in axle and link;

Second curved slot, this groove are formed on the sidewall of sheet feed cassette;

A fixed parts that is positioned at sheet feed cassette;

A lever, this lever are bent to two parts, and an end of lever inserts in second groove highlightedly, and another lever end rotatably is connected with fixed parts by hinge;

A near brake equipment that is located at second groove, this device is used to stop the motion of lever end;

One second elastomeric element, the one end links to each other with second drive part of an adaptor union, and its other end links to each other with lever end, so that there are tensile force to each other in axle and link.

17. paper twisting device according to claim 16, wherein this first, second elastomeric element is a tension coil springs.

18. paper twisting device according to claim 16 wherein for preventing that axle breaks away from from this first curved slot, is formed with the fitting recess of certain depth on the excircle of each end of edge axle.

19. paper twisting device according to claim 16, wherein the both ends of this first curved slot all form round shape, this circle diameter greater than the width of this first curved slot, so that axle easily can be moved and is fixed in this first groove.

20. paper twisting device according to claim 16, wherein brake equipment comprises:

A locking device, this locking device are installed in the top of second groove on the sidewall of sheet feed cassette by hinge, be used for covering partly second groove;

A drg of giving prominence to from second groove below, this drg is used to limit the rotation of locking device.

21. paper twisting device according to claim 20, wherein this locking device comprises a knob, and this knob outwards is arranged on the outside face of locking device highlightedly, so that the user operates.

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