CN108128644B

CN108128644B - Paper tray and image forming apparatus

Info

Publication number: CN108128644B
Application number: CN201711214079.8A
Authority: CN
Inventors: 容学宇; 刘金莲; 曹建新; 熊志强; 梁祺杰; 杨妙玲
Original assignee: Ninestar Corp
Current assignee: Ninestar Corp
Priority date: 2016-12-01
Filing date: 2017-11-28
Publication date: 2021-05-07
Anticipated expiration: 2037-11-28
Also published as: CN108128644A

Abstract

The invention provides a paper tray and an image forming apparatus, the paper tray includes: a positioning member including a blocking portion for blocking a recording medium in the sheet tray, a sliding portion, and an elastic member in contact with the blocking portion and the sliding portion, respectively; the mounting groove is arranged on the paper disc, and the sliding part is mounted in the mounting groove; the positioning member is retractable when it comes into contact with a side wall of the image forming apparatus, so that the paper tray can be retracted into the image forming apparatus without hindrance. The positioning component provided by the invention can be automatically folded in the paper tray folding process, so that the positioning component is prevented from interfering the paper tray, and the paper tray cannot be folded.

Description

Paper tray and image forming apparatus

[ technical field ] A method for producing a semiconductor device

The present invention relates to the field of printing technologies, and in particular, to an image forming apparatus and a sheet tray.

[ background of the invention ]

An image forming apparatus is a device that forms an image on a recording material by an electrophotographic image forming process technology, such as: electrophotographic copies, laser printers, electrophotographic printers, facsimile machines, word processors, and the like.

In the related art, as shown in fig. 1, an image forming apparatus 1 includes a main body 2, and a process cartridge 7 (shown in fig. 29) detachably mounted in the main body 2. The main body 2 is usually further provided with a paper tray 3 for supporting a recording medium (not shown), the paper tray 3 is rotatably connected with the main body 2, the paper tray 3 is provided with a mounting groove 31 extending along the X direction, a positioning member 4 capable of sliding along the mounting groove 31 is arranged in the mounting groove 31, and the positioning member 4 and the mounting groove 31 are in interference fit, so that the positioning member 4 can slide in the mounting groove 31 after being subjected to a certain acting force. When a recording medium (e.g., a sheet of paper) is set in the paper feed port 20, a part of the recording medium is positioned on the paper tray 3, and the positioning member 4 is slid in the X direction to a position abutting against the recording medium by applying a force in the X direction to the positioning member 4 to position the recording medium. In order to facilitate transportation and movement, the recording medium on the paper tray 3 needs to be removed before the image forming apparatus 1 is moved or transported, and then the paper tray 3 is rotated by a certain angle in the N direction around the connecting point of the paper tray 3 and the main body 2 to collect the paper tray 3, thereby reducing the space occupied by the image forming apparatus 1.

However, if the user forgets to push the positioning member 4 a certain distance in the X direction before the paper tray 3 is stored, the positioning member 4 can be inserted into the paper feed opening 20, or the positioning member 4 can be inserted into the paper feed opening 20 after the paper tray 3 is stored. The positioning member 4 is sandwiched between the sheet tray 3 and the side surface 21 of the main body 2, and the sheet tray 3 cannot be stored.

[ summary of the invention ]

The present invention provides a paper tray on an image forming apparatus, the paper tray including:

a positioning member including a blocking portion for blocking a recording medium in the sheet tray, a sliding portion, and an elastic member in contact with the blocking portion and the sliding portion, respectively;

the mounting groove is arranged on the paper disc, and the sliding part is mounted in the mounting groove;

the positioning member is retractable when it comes into contact with a side wall of the image forming apparatus, so that the paper tray can be retracted into the image forming apparatus without hindrance.

The technical scheme provided by the invention can achieve the following technical effects:

the positioning component provided by the invention can be automatically folded in the paper tray folding process, so that the positioning component is prevented from interfering the paper tray, and the paper tray cannot be folded.

[ description of the drawings ]

FIG. 1 is a schematic diagram of an image forming apparatus according to the prior art;

FIG. 2 is a schematic structural view of a first positioning member according to the present invention;

FIGS. 3 and 4 are schematic views showing the assembly of a first positioning member according to the present invention;

fig. 5 and 6 are schematic diagrams illustrating a movement process of a first positioning component according to the present invention;

FIG. 7 is a schematic view of a second positioning member according to the present invention;

FIG. 8 is a schematic view of a second positioning member assembly according to the present invention;

fig. 9 and 10 are schematic diagrams illustrating the movement process of a second positioning component according to the present invention;

FIG. 11 is a schematic view of a third positioning member according to the present invention;

FIGS. 12-15 are partial views of FIG. 11, respectively;

FIG. 16 is a schematic view of the assembly of a third positioning member according to the present invention;

FIG. 17 shows a partial view of FIG. 16;

FIGS. 18 and 19 are schematic views illustrating the movement process of a third positioning member according to the present invention;

fig. 20 to 22 are schematic views of a structure of a paper feeding wheel in the prior art;

fig. 23 and 24 are schematic structural views of a first paper feeding wheel according to the present invention;

fig. 25 and 26 are schematic structural views of a second paper feeding wheel according to the present invention;

fig. 27 and 28 are schematic structural views of a third paper feeding wheel according to the invention;

FIG. 29 is a schematic view showing a configuration of an image forming apparatus according to the present invention;

fig. 30 and 31 are schematic views showing a process of mounting the process cartridge to the image forming apparatus according to the related art;

FIG. 32 is a schematic view showing a structure of a process cartridge according to the present invention;

FIG. 33 is a schematic view showing a process cartridge according to the present invention engaged with a lower plate of an image forming apparatus;

[ detailed description ] embodiments

FIG. 1 is a schematic diagram of an image forming apparatus according to the prior art; FIG. 2 is a schematic structural view of a first positioning member according to the present invention; fig. 3 is a schematic diagram illustrating a movement process of a first positioning component according to the present invention.

The invention provides a first positioning component, which can automatically fold a paper tray 3 after the positioning component is abutted against a side surface 21 in the process of folding the paper tray 3, thereby avoiding that the paper tray 3 can not be folded due to the clamping between the paper tray 3 and the side surface 21.

As shown in fig. 2, the first positioning member 40 includes a stopper 401, a connection pin 403, an elastic member 406, and a sliding portion 408. The stopper portion 401 is adapted to abut against the recording medium on the sheet tray 3 to prevent the recording medium from moving in the reverse direction in the X direction, the slide portion 408 is slidable in the mounting groove 31 in the X direction or in the reverse direction in the X direction, and the stopper portion 401 and the slide portion 408 are rotatably connected to each other. Preferably, the blocking portion 401 is a plate-shaped structure, two first connection holes 402 for rotatably connecting with the sliding portion 408 are provided at one end of the blocking portion 401, the two first connection holes 402 are respectively provided at one side of the blocking portion 401 along the X direction and at the opposite side along the X direction, and the axes of the two first connection holes 402 are coaxial; the connection pin 403 is a cylindrical structure, and the shape of the cross section perpendicular to the axial direction thereof is substantially the same as the shape of the cross section perpendicular to the axial direction of the first connection hole 402; preferably, the elastic member 406 is a torsion spring; the sliding part 408 is of a plate-shaped structure, two sliding rails 407 are arranged on two sides of the sliding part 408 along the direction parallel to the Z direction, two second connecting holes 405 are arranged on one side of the sliding part 408 along the Z direction, the two second connecting holes 405 are respectively arranged on one side of the sliding part 408 along the X direction and one side opposite to the X direction, the axes of the two second connecting holes 405 are coaxial, and the shape of the cross section of the second connecting hole 405 perpendicular to the axial direction is basically the same as the shape of the cross section of the connecting pin 403 perpendicular to the axial direction; a first abutting portion 404 and a mounting post 409 are further provided on the sliding portion 408, the first abutting portion 404 is used for limiting the rotation angle of the blocking portion 401 relative to the sliding portion 408, the mounting post 409 is used for mounting the elastic member 406, and preferably, the first abutting portion 404 and the mounting post 409 are provided on the opposite side of the sliding portion 408 in the X direction.

The assembling relationship between the parts of the first positioning member 40 will be described in detail below.

As shown in fig. 3, the blocking section 401 is moved such that one of the two first connection holes 402 of the blocking section 401 is located at one side of the sliding section 408 in the X direction and the other is located at the opposite side of the sliding section 408 in the X direction, and the first connection hole 402 overlaps the second connection hole 405 in the X direction. Then, one of the two connection pins 403 is inserted into the first connection hole 402 of the blocking portion 401 on the opposite side in the X direction and the second connection hole 405 of the sliding portion 408 on the opposite side in the X direction along the X direction, and the other connection pin 403 is inserted into the first connection hole 402 of the blocking portion 401 on the opposite side in the X direction and the second connection hole 405 of the sliding portion 408 on the opposite side in the X direction along the X direction, so that the blocking portion 401 and the sliding portion 408 are rotatably connected; then, the elastic member 406 is sleeved on the mounting post 409, so that one end of the elastic member 406 abuts against the sliding portion 408, and the other end abuts against the blocking portion 401. The elastic member 406 applies an elastic force to the stopper portion 401, and rotates the stopper portion 401 relative to the sliding portion 408 about the axis of the connecting pin 403 in the M direction to a position where it abuts against the first abutting portion 404. At this time, a surface of the blocking portion 401 on one side in the X direction is substantially perpendicular to the X direction, a maximum included angle formed between the blocking portion 401 and the sliding portion 408 is δ, δ is smaller than 90 degrees, and the first positioning member 40 is in the first position.

FIG. 4 is a schematic view of the assembly of the first positioning member; fig. 5 and 6 are schematic diagrams illustrating the movement process of the first positioning component; for ease of viewing, some of the structures in the drawings are not shown.

As shown in fig. 4 to 6, a first guide groove 32 that fits the slide rail 407 on the slide portion 408 is provided in the mounting groove 31 of the sheet tray 3 along one side in the Z direction and one side in the reverse direction to the X direction, an opening is provided in the mounting groove 31 along one side in the X direction or one side in the reverse direction to the X direction through which the first type positioning member 40 can be mounted in the mounting groove 31, and the slide rail 407 of the slide portion 408 fits the first guide groove 32 of the mounting groove 31 so that the first type positioning member 40 can slide in the X direction or the reverse direction to the X direction in the first guide groove 32. Thus, when the recording medium is vibrated and moved in the reverse direction of the X direction on the sheet tray 3, the stopper 401 abutting against the recording medium applies a force in the reverse direction of the X direction to the recording medium, thereby stopping the movement of the recording medium. In order to avoid the situation that the acting force between the recording medium and the first positioning member 40 is too large to push the positioning member to slide, the first guide groove 32 and the slide rail 407 are in interference fit by setting the sizes of the first guide groove 32 and the slide rail 407, so that the maximum static friction force and the sliding friction force between the first guide groove 32 and the slide rail 407 when the first positioning member 40 slides in the mounting groove 31 are increased, and the maximum acting force between the recording medium and the first positioning member 40 is smaller than the maximum static friction force between the first guide groove 32 and the slide rail 407. Preferably, the maximum acting force between the recording medium and the first type positioning member 40 is smaller than the sliding friction between the first guide groove 32 and the slide rail 407.

In the process of storing the sheet tray 3, after the sheet tray 3 is rotated by a certain angle in the N direction with respect to the main body 2, as shown in fig. 5, the stopper 401 of the first positioning member 40 abuts against the side surface 21 of the main body 2 and receives a force F from the side surface 21. When the force F is large enough, the stopper 401 is pushed to rotate about the axis of the connecting pin 403 in the direction opposite to the direction M with respect to the slider 408, thereby reducing the maximum distance between the stopper 401 and the paper tray 3, enabling the paper tray 3 to continue to rotate in the direction N. When the stopper portion 401 is rotated to the set position in the M direction about the axis of the connecting pin 403 with respect to the sliding portion 408 by the urging force F, the paper tray 3 is completely retracted as shown in fig. 6. At this time, the first positioning member 40 is in the second position.

The present invention also provides a second positioning member that can be automatically stored after the positioning member abuts against the side surface 21 in the process of storing the sheet tray 3, thereby preventing the sheet tray 3 from being unable to be stored due to being sandwiched between the sheet tray 3 and the side surface 21.

FIG. 7 is a schematic view of a second positioning member according to the present invention; FIG. 8 is a schematic view of a second positioning member assembly according to the present invention; fig. 9 and 10 are schematic diagrams illustrating a second positioning component movement process according to the present invention. For the sake of easy observation, a part of the structure in the drawings is not shown.

As shown in fig. 7, the second positioning member 41 includes a stopper 410, an elastic member 416, and a gear 415. The stopper 410 is adapted to abut against the recording medium on the paper tray 3 and prevent the recording medium from moving in the reverse direction in the X direction after receiving a shock, and the stopper 410 is further provided with a second abutting portion 414 for restricting a rotation angle of the stopper 410, and a first support shaft 411 and a second support shaft 412 which are rotatably formed on the paper tray 3. Preferably, the blocking portion 410 is a plate-shaped structure, the first support shaft 411 is disposed at one side of the blocking portion 410 along the Z direction, the second support shaft 412 is disposed at the opposite side along the Z direction, the first support shaft 411 and the second support shaft 412 are cylindrical structures, and the axes of the first support shaft 411 and the second support shaft 412 are substantially coincident; preferably, the elastic member 416 is a torsion spring, and the elastic member 416 is sleeved on the second support shaft 412 and one end of the elastic member 416 abuts against the stopper 410. Preferably, a third abutting portion 413 protruding in the direction opposite to the Z direction is further provided on the side opposite to the Z direction of the stopper portion 410, and one end of the elastic member 416 abuts against the third abutting portion 413. The gear 415 is provided with a circular hole 4151 coaxial with the axis of the gear 415, the diameter of the circular hole 4151 is substantially the same as that of the second support shaft 412, and after the elastic member 416 is sleeved on the second support shaft 412, the gear 415 is sleeved on the second support shaft 412.

In correspondence with the first support shaft 411 and the second support shaft 412 of the second type positioning member 41, a first slide groove 35 is provided on one side of the mounting groove 31 in the Z direction, and a second slide groove 33 is provided on the opposite side in the Z direction, and preferably, a rack 34 extending in the X direction is further provided on one side of the second slide groove 33 in the thickness direction of the sheet tray 3, and the rack 34 can be engaged with a gear 415.

When the second type positioning member 41 is mounted in the mounting groove 31 of the paper tray 3, as shown in fig. 7 and 8, the positioning member 41 is moved to the opening of the mounting groove 31 in the X direction so that the first support shaft 411 of the positioning member 41 corresponds to the opening of the first chute 35 in the X direction and the second support shaft 412 corresponds to the opening of the second chute 33 in the X direction. Then, the positioning member 41 is moved in the reverse direction of the X direction, the first support shaft 411 of the second type positioning member 41 is inserted into the first slide groove 35, the second support shaft 412 fitted around is inserted into the second slide groove 33, the gear 415 fitted around the second support shaft 412 is engaged with the rack 34 provided in the second slide groove 33, and the other end of the elastic member 416 is abutted against the bottom surface 311 of the mounting groove 31.

By setting the sizes of the first support shaft 411 and the first chute 35, an interference fit is formed between the first support shaft 411 and the first chute 35, so that the maximum static friction force and the sliding friction force between the first support shaft 411 and the first chute 35 are increased, and the maximum acting force between the recording medium and the second positioning member 41 is smaller than the maximum static friction force between the first support shaft 411 and the first chute 35. Alternatively, the gear 415 is provided so as to form an interference fit between the gear 415 and the second chute 33, thereby increasing the maximum static friction force and the sliding friction force between the gear 415 and the second chute 33, and making the maximum acting force between the recording medium and the second type positioning member 41 smaller than the maximum static friction force between the first guide groove 32 and the slide rail 407. Further, the axes of the first support shaft 411 and the second support shaft 412 are kept substantially parallel to the Z direction by the engagement of the gear 415 with the rack 34.

By abutting one end of the elastic member 416 against the stopper 410 and the other end against the bottom surface 311 of the mounting groove 31, the elastic member 416 applies an urging force to the stopper 410, so that the stopper 410 rotates in the K direction around the axes of the first support shaft 411 and the second support shaft 412 until the second abutting portion 414 provided on the stopper 410 abuts against the bottom surface 311 of the mounting groove 31, and the stopper 410 stops rotating. At this time, as shown in fig. 9, a surface 4101 of the barrier 410 on one side in the X direction is perpendicular to the X direction, and the second type ground member 41 is in the first position.

When the paper tray 3 is rotated in the N direction with respect to the main body 2 to collect the paper tray 3, as shown in fig. 10, the stopper portion 410 of the second positioning member 41 abuts against the side face 21 of the main body 2, and receives a force F1 applied from the side face 21, and the force F1 pushes the stopper portion 410 to rotate in the direction opposite to the K direction with respect to the paper tray 3 about the axis of the second support shaft 412, so that the paper tray 3 can continue to rotate in the N direction. When the paper tray 3 is fully retracted when the stopper 410 is rotated to the set position by the force F1, the second type positioning member 41 is in the second position.

The present invention further provides a third positioning member, so that in the process of storing the paper tray 3, the positioning member can automatically move to one end of the paper tray 3 in the X direction, thereby preventing the paper tray 3 from being unable to be stored due to being clamped between the paper tray 3 and the side surface 21.

FIG. 11 is a schematic structural view of a third positioning member provided in the present invention; fig. 12-15 show partial views of fig. 11.

As shown in fig. 11 and 12, the third positioning member 42 includes a blocking member 420, a positioning slider 373, an elastic member 375, a first pulling member 371, and a second pulling member 372. The blocking member 420 includes a blocking portion 4201 and a sliding portion 4202, and a guide rail 421 is provided on one side of the sliding portion 4202 in the Z direction and on the opposite side in the Z direction; the stopper member 420 is further provided with a tension portion 423 for connecting to the second pulling member 372, and a positioned portion 422 for abutting against the positioning slider 373. Preferably, the positioned portion 422 is a positioned portion 422 provided on the rail 421, and the tension portion 423 is a hook provided on one side of the sliding portion 4202 in the X direction. The positioning slider 373 is brought into contact with the blocking member 420 by sliding relative to the blocking member 420 to position the blocking member 420, and preferably, the positioning slider 373 is provided as a ramp surface toward one side of one end of the blocking member 420 in the X direction and the side opposite to the X direction. The elastic member 375 abuts against the positioning slider 373 to apply an elastic force to the positioning slider 373 to move the positioning slider 373, and preferably, the elastic member 375 is a spring. The first pulling member 371 is connected to the positioning slider 373 to pull the positioning slider 373 to move, and preferably, the first pulling portion 371 has a linear structure. The second pulling member 372 is connected to the tension 423 of the blocking member 420 to pull the blocking member 420 to move in the X direction, and preferably, the second pulling member 372 is a linear structure made of an elastic material.

In correspondence with the first pulling member 371, the positioning slider 373, as shown in fig. 13, a second guide groove 321 and a third guide groove 323 which communicate with each other are provided on one side of the mounting groove 31 of the sheet tray 3 in the Z direction or on the opposite side in the Z direction, the second guide groove 321 being for accommodating the first pulling member 371, and the third guide groove 323 being for accommodating the positioning slider 373. The second guide groove 321 extends toward one end of the sheet tray 3 in the X direction, and has an opening at one end of the sheet tray 3 in the X direction; the third guide groove 323 extends toward the mounting groove 31 and communicates with the mounting groove 31. Preferably, the extending direction of the second guide groove 321 is parallel to the X direction, and the extending direction of the third guide groove 323 is perpendicular to the X direction (parallel to the Z direction), that is, the positioning slider 373 is capable of moving in the Z direction or in the direction opposite to the Z direction in the third guide groove 323. Preferably, the extending direction of the second guide groove 321 is parallel to the X direction, and the extending direction of the third guide groove 323 is perpendicular to the X direction.

The sheet tray 3 is further provided with a cover 374, and the cover 374 covers the second guide groove 321 and the third guide groove 323 of the sheet tray 3, so that displacement of each component of the third positioning member 42 in the thickness direction of the sheet tray 3 (the direction perpendicular to both the X direction and the Z direction) is restricted, and each component of the third positioning member 42 is prevented from falling off the sheet tray 3. Further, the cover plate 374 can partially cover one end of the mounting groove 31 in the Z direction and the opposite end in the Z direction after being mounted on the sheet tray 3, and forms a first guide groove 32 with the mounting groove 31, and the first guide groove 32 can be engaged with the guide rail 421 of the blocking member 420 to slide the blocking member 420 in the X direction in the mounting groove 31. Preferably, the cover 374 is provided in a "U" shaped configuration.

As shown in fig. 14 and 15, support shafts 39 are provided on one side of the paper tray 3 in the Z direction and on the opposite side in the Z direction, support holes 29 are further provided on one side in the Z direction and on the opposite side in the Z direction in the main body 2 of the image forming apparatus 1, and by fitting the support shafts 39 into the support holes 29, the paper tray 3 is connected to the main body 2, and the paper tray 3 can rotate relative to the main body 2 about the axis of the support shafts 39.

The fitting relationship between the respective components of the third positioning member provided by the present invention and the sheet tray 3 and the cover plate 374 will be described in detail below.

As shown in fig. 16 and 17, one end of the first pulling member 371 is connected to one end of the positioning slider 373 away from the blocking member 420 through the elastic member 375 by means of adhering, welding or screwing, or one end of the first pulling portion 371 in a linear structure is directly tied to one end of the positioning slider 373 away from the blocking member 420, specifically, the invention is not limited to the first pulling member 371 and the positioning slider 373, and then the other end of the first pulling member 371 is connected to the main body 2 of the image forming apparatus 1 or one end of the paper tray 3 in the X direction.

Then, the first pulling portion 371 is installed in the second guide groove 321, the positioning slider 373 and the elastic member 375 are installed in the third guide groove 323, one end of the elastic member 375 abuts on one end of the positioning slider 373 away from the mounting groove 31, and the other end abuts on the inner wall of the third guide groove 323 at the side away from the mounting groove 31, so that the elastic member 375 applies an elastic force to the positioning slider 373, and the positioning slider 373 extends out of the third guide groove 323 along the third guide groove 323 toward the mounting groove 31. When the first pulling portion 371 slides in the second guide groove 321 along the X direction, the positioning slider 373 is pulled to move along the third guide groove 323 toward a direction away from the mounting groove 31.

Thereafter, the "U" -shaped cover plate 374 is attached to the sheet tray 3 by welding, sticking, or screwing, etc., the second pulling member 372 is connected to the tension portion 423 of the blocking member 420, the blocking member 420 is attached to the mounting groove 31 from the opening at one end of the mounting groove 31 in the X direction, and the blocking member 420 is allowed to slide in the X direction or in the reverse direction of the X direction in the mounting groove 31 by the engagement of the guide rail 421 of the blocking member 420 with the first guide groove 32. Finally, the first pulling portion 371 is connected to the main body 2 of the image forming apparatus 1 (as shown in fig. 18). The other end of the second pulling member 372 is connected to the main body 2 of the image forming apparatus 1, or the second pulling member 372 is directly connected to one end of the paper tray 3 in the X direction. Since the second pulling member 372 is made of an elastic material, when the stopper member 420 is in a position abutting against the recording medium, the second pulling member 372 is in a stretched state, and applies an elastic force in the X direction to the stopper.

When the image forming apparatus 1 is in the operating state, as shown in fig. 17, the sheet tray 3 is in the operating position, and one end of the positioning slider 373 near the mounting groove 31 is extended out of the third guide groove 323 by the elastic member 375 and the first pulling member 371. After the recording medium is set on the paper tray 3, the blocking member 420 is moved in the X direction. When the guide rail 421 of the blocking member 420 abuts against the positioning slider 373 and extends out of the end portion of the third guide groove 323, the blocking member 420 applies a force to the inclined sliding surface on the opposite side of the end portion in the X direction, so that the positioning slider 373 is retracted into the third guide groove 323 in a direction away from the mounting groove 31. When the stopper member 420 is moved to a position where the stopper portion 4201 abuts against the recording medium, the positioned portion 422 provided on the guide rail 421 faces the third guide groove 323, the urging force of the guide rail 421 to the positioning slider 373 disappears, the positioning slider 373 protrudes toward the mounting groove 31 by the elastic member 375 and is inserted into the positioned portion 422, thereby positioning the stopper member 420, and the stopper member 420 needs to receive a large urging force in the X direction or in the reverse direction to the X direction to be slidable in the mounting groove 31. At this time, as shown in fig. 18, the length of the first pulling member 371 outside the second guide groove 321 is L1, i.e., the distance between the point R where the first pulling member 371 and the main body 2 are connected and the point T where the first pulling member 371 is located at the opening of the second guide groove 321 in the X direction is L1.

When it is necessary to collect the paper tray 3, as shown in fig. 19, after the paper tray 3 is rotated in the N direction about the support shaft 39 to a set position, the length of the first pulling portion 371 outside the second guide groove 321 is L2, i.e., the distance between the point R where the first pulling member 371 and the main body 2 are connected to the point T where the first pulling member 371 is located at the opening of the second guide groove 321 in the X direction is L2. Since L2 is larger than L1, that is, the first pulling member 371 moves in the second guide groove 321 in the X direction during the rotation of the paper tray 3 in the N direction around the support shaft 39, and thus the positioning slider 373 moves along the third guide groove 323 in the direction away from the mounting groove 31, so that the positioning slider 373 is drawn out from the positioned portion 422 of the stopper member 420, the positioning action of the positioning slider 373 on the stopper member 420 is lost, and the stopper member 420 needs to be subjected to a small force in the X direction or in the direction opposite to the X direction to slide in the mounting groove 31. At this time, since the second pulling member 372 made of an elastic material is in a stretched state, a force toward the X direction is applied to the blocking member 420 by the second pulling member 372, and the positioning slider 373 that is not positioned by the positioning slider 373 slides to one end of the paper tray 3 in the X direction by the second pulling member 372, so that when the paper tray 3 is stored, the blocking member 420 can enter the paper feeding port 20 of the main body 2, and the blocking member 420 is prevented from being sandwiched between the paper tray 3 and the side surface 21.

As shown in fig. 18 and 19, a connection line RS is formed between a connection point R of the first pulling member 371 and the main body 2 and an axis S of the support shaft 39, and a connection line ST is formed between the axis S of the support shaft 39 and a point T of the first pulling member 371 located at the opening of the second guide groove 321 in the X direction. When the sheet tray 3 is in the working position, the angle formed between the connecting line RS and the connecting line ST is α, and when the sheet tray 3 is rotated in the N direction about the support shaft 39 to the set position, the angle formed between the line RS and the connecting line ST is β. To ensure that distance L2 is greater than L1, included angle α should be less than included angle β. Preferably, the point T is located downstream of the connection point R in the direction of rotation N about the axis S.

For different types of recording media, the blocking member 420 needs to be moved to different positions in the mounting groove 31 to abut against one end of the recording medium in the direction opposite to the X direction. In the present invention, a plurality of positioning sliders 373 are disposed in the mounting groove 31 along the X direction, and a plurality of end portions may be disposed at an end of the first pulling member 371 opposite to the X direction to connect with the positioning sliders 373. When the first pulling portion 371 located in the second guide groove 321 slides in the X direction, the first pulling portion 371 simultaneously pulls the plurality of positioning sliders 373 to move away from the mounting groove 31.

Further, in order to enhance the positioning performance of the positioning slider 373 on the stopper member 420, it is preferable that the positioned portions 422 be provided simultaneously on the guide rail 421 of the stopper member 420 in the Z direction and in the direction opposite to the Z direction, and the positioning slider 373 be provided simultaneously on the side of the mounting groove 31 in the Z direction and in the direction opposite to the Z direction.

With the first type positioning member 40 and the second type positioning member 41, after the paper tray 3 is stored, the side surface 21 always applies a force to the first type positioning member 40 or the second type positioning member 41, and the force is transmitted to the paper tray 3, so that the paper tray 3 is rotated in the reverse direction of the N direction with respect to the main body 2, and the paper tray 3 cannot be stored. In order to avoid the situation, the invention is also provided with a detachable buckle between the paper tray 3 and the main body 2, and the folded paper tray 3 can be opened after being subjected to certain acting force through the action of the detachable buckle.

Specifically, as shown in fig. 14, the elastic arm 38 is provided on one side of the paper tray 3 in the Z direction and on the opposite side in the Z direction, and a positioning protrusion 381 protruding toward a direction away from the paper tray 3 is provided at a free end of the elastic arm 38. Preferably, the elastic arm 38 is made of plastic material and is integral with the paper tray 3; one end of the positioning projection 381 in the projecting direction thereof is provided as an arc surface. In correspondence with the positioning projections 381 of the elastic arm 38, positioning holes 28 (shown in fig. 15) are provided on the inner wall of the main body 2 of the image forming apparatus 1 on the side in the Z direction and on the side opposite to the Z direction. When the paper tray 3 is mounted on the main body 2, the positioning projections 381 of the elastic arms 38 abut against the inner wall of the main body 2, and the positioning projections 381 are pressed by the main body 2 to push the elastic arms 38 to swing in the direction opposite to the projecting direction of the positioning projections 381; when the paper tray 3 is retracted, the positioning projections 381 are rotated to positions corresponding to the positioning holes 28, the urging force of the main body 2 to the positioning projections 381 disappears, and the elastic arms 38 are swung toward the projecting direction of the positioning projections 381, so that the positioning projections 381 enter the positioning holes 28, thereby positioning the paper tray 3. When the paper tray 3 needs to be opened, a certain acting force is applied to the paper tray 3, the arc surface of the positioning protrusion 381 is abutted to the edge of the positioning hole 28, and a pressing force exists, when the acting force applied to the paper tray 3 is large enough, the pressing force can press the positioning protrusion 381, the elastic arm 38 swings in the direction opposite to the protruding direction of the positioning protrusion 381, the positioning protrusion 381 is separated from the positioning hole 28, and the paper tray 3 can rotate in the direction opposite to the N direction relative to the main body 2.

In the related art, as shown in fig. 1, a paper feeding wheel 6 for transporting a recording medium, including an upper paper feeding wheel 61 and a lower paper feeding wheel 62, is further provided at a paper discharge port 201 of a main body 2 of an image forming apparatus 1. The upper paper feed wheel 61 and the lower paper feed wheel 62 abut against each other, and the recording medium sandwiched between the upper paper feed wheel 61 and the lower paper feed wheel 62 is transported by rotating the upper paper feed wheel 61 and the lower paper feed wheel 62. As shown in fig. 20 and 21, the upper feed roller 61 is rotatably supported on the main body 2 by a rotary shaft 611 provided at both ends, and the position of the rotary shaft thereof is fixed with respect to the main body 2; the lower feed wheel 62 is rotatably supported on the support mechanism by a plurality of rotating shafts 621 provided at both ends of the lower feed wheel 62, and is symmetrical about a symmetry axis H1. The support mechanism is provided on the inner wall 22 below the sheet discharge port 201, and includes a support frame 63, a stopper 65, and a spring 66. The rotating shaft 621 of the lower feed roller 62 is rotatably supported on the supporting frame 63, and the supporting frame 63 is provided at both ends thereof with a restricted portion which is a cylindrical projection 631 projecting in a direction away from the symmetry axis H1. The limiting parts 65 are used for limiting the movement of the supporting frame 63, the number of the limiting parts is two, the two limiting parts are respectively arranged on two sides of the supporting frame 63, limiting grooves 651 extending along the Y direction are arranged on the limiting parts 65, and the cylindrical protrusions 631 on two sides of the supporting frame 63 are located in the limiting grooves 651 of the limiting parts 65. The spring 66 is disposed between the supporting frame 63 and the inner wall 22, has one end abutting against the inner wall 22 and the other end abutting against the supporting frame 63, and applies an elastic force to the supporting frame 63 to push the supporting frame 63 and the lower paper feeding wheel 62 to extend toward the Y direction, so that the lower paper feeding wheel 62 abuts against the upper paper feeding wheel 61 (as shown in fig. 21).

However, during the operation of the image forming apparatus 1, as shown in fig. 22, the support frame 3 may be tilted by a shock, and the rotation axis of the lower feed roller 62 is not parallel to the rotation axis of the upper feed roller 61, so that the pressing force between the lower feed roller 62 and the upper feed roller 61 tilted toward the upper feed roller 61 may increase. When the recording medium with the developer image passes through the upper and

lower feed rollers

61 and 62, the lower feed roller 62 having an excessive pressure with the upper feed roller 61 may scratch the developer image on the recording medium.

In order to avoid the above situation, the present invention provides a first supporting mechanism, which prevents the supporting frame from being inclined due to vibration during the operation of the image forming apparatus.

As shown in fig. 23, the first supporting mechanism provided by the present invention includes a supporting frame 630, an elastic member 66 and a limiting portion 67. The connection manner of the supporting frame 630 and the lower roller 62 and the elastic member 66 are substantially the same as those of the prior art, and the differences mainly lie in the structures of the supporting frame 630 and the limiting portion 67. The limited part of the support frame 630 of the first support mechanism provided by the invention is a long strip-shaped protrusion 632 arranged at two ends of the support frame 630 and extending along the Y direction, one side of the two limit parts 67 opposite to each other is provided with a limit sliding groove 671 corresponding to the long strip-shaped protrusion 632 on the support frame 630, and the cross section of the long strip-shaped protrusion 632 perpendicular to the Y direction is basically the same as the cross section of the limit sliding groove 671 perpendicular to the Y direction in shape. Preferably, the cross-section of the positioning protrusion 432 and the limit chute 671 perpendicular to the Y direction has a rectangular shape, and after the support frame 630 is mounted on the limit portion 67, the elongated protrusion 632 substantially overlaps the limit chute 671 in the Y direction. By making the outer surface of the elongated protrusion 632 closely contact with the inner surface of the limiting chute 671, the limiting support 630 can only slide along the Y direction or along the reverse direction of the Y direction, and cannot swing.

The invention also provides a second supporting mechanism which prevents the supporting frame from being inclined due to vibration in the working process of the image forming device.

As shown in fig. 25 and 26, the second support mechanism includes a support frame 633, an elastic member 68, and a stopper 65. The structure of the limiting portion 65 and the connection manner between the limiting portion 65 and the supporting frame 633 are basically the same as those of the prior art, and the difference is mainly the supporting frame 633 and the elastic member 68, and the supporting frame 633 is provided with an installation portion for installing the elastic member 68. The elastic member 68 is a double spring including a first support arm 681 positioned at a middle portion of the elastic member 68 and second and

third support arms

682 and 683 positioned at both ends of the elastic member 68, and the second and

third support arms

682 and 683 are substantially the same in shape. Preferably, the mounting portion of the support bracket 633 includes two protruding portions 634 further provided at a side of the support bracket 633 opposite to the Y direction, and a mounting shaft 636 supported at the protruding portions 634. Two protruding portions 634 are respectively provided at both ends of the support frame 633 in the axial direction of the lower roller 62, and mounting holes 635 are provided in the protruding portions 634. Preferably, the mounting shaft 636 has a cross-sectional shape that is substantially the same as the cross-sectional shape of the mounting bore 635. In assembling the second support mechanism, the mounting shaft 636 is inserted through the mounting hole 635 of one of the protruding portions 634, the elastic member 68 is fitted over the mounting shaft 636, the first support arm 681 of the elastic member 68 is supported by the support frame 633, the mounting shaft 636 is inserted through the mounting hole 635 of the other protruding portion 634, and finally the support frame 633 with the lower roller 62 mounted thereon is mounted in the limit groove 651 of the limit portion 65, so that the second support arm 682 and the third support arm 683 of the elastic member 68 abut against the inner wall 22. The assembling relationship between the supporting frame 633 and the limiting portion 65 and the assembling relationship between the lower roller 62 and the supporting frame 633 are substantially the same as those in the prior art, and are not described herein again.

After the second supporting arm 682 and the third supporting arm 683 abut against the inner wall 22, the acting forces F3 and F4 exerted by the inner wall 22 are respectively applied to the second supporting arm 682 and the third supporting arm 683, and since the shapes of the second supporting arm 682 and the third supporting arm 683 are substantially the same, the magnitudes and directions of the acting forces F3 and F4 are also substantially the same, and the acting forces are symmetrical about the symmetry axis H1, so that the two ends of the lower roller 62 along the axial direction of the lower roller 62 are applied with the same magnitude and direction, and the supporting frame 633 is prevented from being easily inclined relative to the upper roller 61 after being subjected to vibration.

The invention also provides a third supporting mechanism which prevents the supporting frame from being inclined due to vibration in the working process of the image forming device.

As shown in fig. 27 and 28, the third support mechanism includes a support frame 63, a stopper 65, an elastic member 69, and a mounting portion for mounting the elastic member 69. The structure of the limiting portion 65 and the supporting frame 63 is substantially the same as the prior art, and the differences mainly include the elastic member 69 and the mounting portion. The elastic member 69 is a double torsion spring, and includes a fourth support arm 691 located at the middle of the double torsion spring 69 and a fifth support arm 692 and a sixth support arm 693 located at both ends of the double torsion spring 68, and the shapes of the fifth support arm 692 and the sixth support arm 693 are substantially the same. The mounting portion is disposed on the inner wall 22 and includes a support portion 24 and a mounting shaft 637 for mounting the elastic member 69, and the support portion 24 is further provided with a mounting hole 25. Preferably, the number of the support portions 24 is two, and is symmetrical about the symmetry axis H1, the shape of the mounting hole 25 on the support portion 24 is substantially the same as the cross-sectional shape of the mounting shaft 637, and the length of the double torsion spring 68 in the axial direction is substantially the same as the distance between the two support portions 24. In assembling the third support mechanism, the mounting shaft 637 is passed through the mounting hole 25 of one support portion 24, then the elastic member 69 is fitted over the mounting shaft 637, the fourth support arm 691 at the middle of the elastic member 69 is supported on the inner wall 22, and then the mounting shaft 637 is passed through the mounting hole 25 of the other support portion 24, so that the elastic member 69 is symmetrical about the symmetry axis H1. Then, the supporting frame 63 with the lower roller 62 mounted thereon is mounted on the limiting portion 65, so that the fifth supporting arm 692 and the sixth supporting arm 693 at the two ends of the elastic member 69 are respectively abutted against the cylindrical protrusions 631 at the two sides of the supporting frame 63. The assembling relationship between the supporting frame 63 and the limiting portion 65 and the assembling relationship between the lower roller 62 and the supporting frame 63 are substantially the same as those of the prior art.

After the fifth supporting arm 692 and the sixth supporting arm 693 at the two ends of the elastic member 69 are respectively abutted to the cylindrical protrusions 631 at the two sides of the supporting frame 63, the cylindrical protrusions 631 at the two sides of the supporting frame 63 are respectively subjected to the acting forces F5 and F6 exerted by the fifth supporting arm 692 and the sixth supporting arm 693, because the elastic member 69 is symmetrical about the symmetry axis H1, the magnitudes and directions of the acting forces F5 and F6 are substantially the same, and are symmetrical about the symmetry axis H1, so that the two ends of the lower roller 62 along the axial direction of the lower roller 62 are subjected to the acting forces with the same magnitudes and directions, and the supporting frame is prevented from being easily inclined relative to the upper roller 61 after being subjected to vibration 63.

In the related art, as shown in fig. 29, an image forming apparatus 1 includes a main body 2 and a process cartridge 7 detachably attached to the main body 2. A space 23 for accommodating the process cartridge 7 is provided in the main body 2 of the image forming apparatus 1, and a first guide rail 27 and a second guide rail 28 (shown in fig. 30) for guiding the process cartridge 7 to be mounted to the main body 2 are also provided on inner walls of the space 23 on both sides in the longitudinal direction of the process cartridge 7. As shown in fig. 30, guide portions for supporting on the guide rails 27 are provided at the end portions in the longitudinal direction of the process cartridge 7, and specifically, the guide portions include a first guide portion 71 and a second guide portion 72 provided at one end in the longitudinal direction of the process cartridge 7, and a third guide portion 73 and a fourth guide portion 74 provided at the other end in the longitudinal direction of the process cartridge 7. When it is necessary to mount the process cartridge 7 in the direction Q into the main body 2, the user usually holds the third guide portion 73 of the process cartridge 7 with a hand, moves the process cartridge 7 to the opening of the space 23 with the first guide portion 71 and the second guide portion 72 of the process cartridge 7 supported on the second guide rail 28 and the third guide portion 73 and the fourth guide portion 74 supported on the first guide rail 27, and then moves the process cartridge 7 along the first guide rail 27 and the second guide rail 28 so that the process cartridge 7 can be moved to a predetermined position in the direction Q within the main body 2.

However, since the casing of the process cartridge 7 is generally made of a plastic material, it has a certain elasticity, and the length of the process cartridge 7 in the longitudinal direction is much longer than the length of the process cartridge 7 in the mounting direction. As shown in fig. 31, if the hand of the user shakes while the process cartridge 7 moves on the guide rail 27, the entire process cartridge 7 may be deflected in the relative direction Q, the guide portion of the process cartridge 7 may be separated from the guide rail 27, and the process cartridge 7 may not be mounted in place, or may be caught on the guide rail.

In order to avoid the above situation, the present invention provides a guide mechanism for preventing the deflection of the process cartridge during the process of mounting the process cartridge in the main body of the image forming apparatus, which results in the process cartridge not being mounted in place.

The guide mechanism provided by the invention comprises a guide part arranged on the main body of the image forming device and a guided part arranged on the processing box, when the processing box is arranged on the main body of the image forming device, the guide part on the main body and the guided part on the processing box can be matched with each other, thereby preventing the processing box from deflecting.

Specifically, as shown in fig. 30 and 32, a lower plate 25 is provided inside the main body 2, and when the process cartridge 7 is mounted in the main body 2, the lower plate 25 is located below the process cartridge 7 and near the process cartridge 7. The guide portion on the main body 2 is a guide groove 26 provided on the lower plate 25 of the main body 2 and extending in the mounting direction of the process cartridge 8; the guided portion on the process cartridge 8 is a guide plate 81 provided on a surface of the housing 80 of the process cartridge 8 opposite to the lower plate 25 and protruding toward the lower plate 25, the guide plate 81 being substantially perpendicular to the longitudinal direction of the process cartridge 8. Preferably, the guide plate 81 has a width substantially equal to the width of the guide groove 26 in the longitudinal direction of the process cartridge 8. The guide plate 81 of the process cartridge 8 corresponds to the guide groove 26 of the lower plate 25 of the main body 2, that is, as shown in fig. 33, the guide plate 81 can be inserted into the guide groove 26 during the process of mounting the process cartridge 8 into the main body 2, and both side surfaces of the guide plate 81 in the direction opposite to the longitudinal direction of the process cartridge 8 and both side surfaces of the guide groove 26 in the longitudinal direction of the process cartridge 8 are attached to each other. Thus, when the guide plate 81 slides in the guide groove 26, the guide groove 26 restricts the guide plate 81 so that the guide plate 81 and, therefore, the process cartridge 8 can move only in the direction Q. Of course, a plurality of guide grooves 26 may be provided on the lower plate 25, and a corresponding plurality of guide plates 81 may be provided on the process cartridge 8 to enhance the restraining action of the guide grooves 26 on the guide plates 81.

Further, the distance between the first guide portion 71 and the second guide portion 72 and/or the distance between the third guide portion 73 and the fourth guide portion 74 may be increased, and the guide portions may abut against the inner wall of the space 23, thereby preventing the process cartridge 7 from being separated from the guide rail 27 or caught on the guide rail 27 due to an excessively large deflection angle.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A paper tray for use on an image forming apparatus, the paper tray comprising:

the positioning component can be stored when contacting with the side wall of the image forming device, so that the paper tray can be stored in the image forming device without obstruction;

the sliding part is also provided with a first abutting part used for limiting the relative angle between the blocking part and the sliding part and an installation column used for installing an elastic piece; the stopper and the mounting post are located on the slider in a direction away from the recording medium.

2. A paper tray according to claim 1, wherein the blocking portion is further provided with two first connecting holes having coaxial axes, the sliding portion is further provided with two second connecting holes having coaxial axes, and the first connecting holes and the second connecting holes are connected by connecting pins to rotatably connect the blocking portion and the sliding portion; the connecting pin is of a cylindrical structure, and the shape of the cross section of the connecting pin perpendicular to the axial direction is basically the same as the shape of the cross section of the first connecting hole perpendicular to the axial direction and/or the shape of the cross section of the second connecting hole perpendicular to the axial direction.

3. The sheet tray as set forth in claim 1, wherein a slide rail is further provided on the slide section; the mounting groove is also provided with a first guide groove; and the mounting groove and the slide rail are in interference fit, so that the maximum acting force between the recording medium and the positioning part is smaller than the maximum friction force between the slide rail and the first guide groove.

4. A paper tray for use on an image forming apparatus, the paper tray comprising:

a positioning member including a stopper for stopping a recording medium in the sheet tray, an elastic member for restricting a movable range of the stopper, and a gear;

the mounting groove is arranged on the paper disc, a second sliding groove is formed in the mounting groove, a rack is further arranged on the second sliding groove, and the rack is meshed with the gear;

5. A paper tray according to claim 4, wherein a second abutting portion is provided on the blocking portion, the second abutting portion being capable of abutting against a bottom surface of the mounting groove to restrict rotation of the positioning member.

6. A sheet tray according to claim 4, wherein said blocking portion is provided with a first support shaft, a second support shaft and a first slide groove, said first support shaft being fitted into said first slide groove, said second support shaft being fitted into said second slide groove.

7. A paper tray as set forth in claim 6 wherein the first and second support shafts are of cylindrical configuration and the axis of the first support shaft is substantially coincident with the axis of the second support shaft; the elastic member is mounted on the second support shaft.

8. The sheet tray according to claim 6, wherein an interference fit is formed between the first support shaft and the first chute such that a maximum acting force between the recording medium and the positioning member is smaller than a maximum static friction force between the first support shaft and the first chute.

9. The paper tray of claim 4, wherein the gear forms an interference fit with the rack such that a maximum force between the recording medium and the positioning member is less than a maximum static friction between the gear and the rack.

10. The sheet tray according to claim 4, wherein one end of the elastic member abuts against a bottom surface of the mounting groove, and the other end thereof contacts the blocking portion.

11. An image forming apparatus, characterized in that the image forming apparatus comprises the paper tray according to any one of claims 1 to 10.