CN108128644A - Paper disc, support construction, guiding mechanism, buckle and image forming apparatus - Google Patents

Abstract

The present invention provides a kind of paper disc, support construction, guiding mechanism, buckle and image forming apparatus, the paper disc and includes：Positioning element, the positioning element include blocking portion, sliding part and elastic component three parts, and the blocking portion is used to stop the recording medium in paper disc, and the elastic component is in contact respectively with the blocking portion and the sliding part；Mounting groove, the mounting groove are set on the paper disc, and the sliding part is mounted in the mounting groove；Can be packed up when the positioning element is contacted with the side wall of described image forming apparatus, enable the paper disc it is accessible be retracted to described image forming apparatus.Positioning element provided by the invention can automatically be packed up during paper disc is packed up, and so as to prevent positioning element from being interfered to paper disc, make paper disc that can not pack up.

Description

Paper tray, support structure, guide mechanism, clips and image forming device

【Technical field】

The invention relates to the technical field of printing, in particular to an image forming device, a paper tray, a supporting structure, a guiding mechanism, and a buckle.

【Background technique】

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

In the prior art, as shown in FIG. 1 , an image forming apparatus 1 includes a main body 2, and a process cartridge 7 detachably installed in the main body 2 (as shown in FIG. 29 ). The main body 2 is usually also provided with a paper tray 3 for supporting recording media (not shown), the paper tray 3 is rotatably connected with the main body 2, and the paper tray 3 is provided with an installation groove 31 extending along the X direction. The installation groove 31 is provided with a positioning part 4 that can slide along the installation groove 31. The positioning part 4 and the installation groove 31 are interference fit, so that the positioning part 4 needs to be subject to a certain force before sliding in the installation groove 31. . After the recording medium (such as paper) is put into the paper inlet 20, a part of the recording medium will be located on the paper tray 3, and the positioning component 4 will slide along the X direction by applying a force along the X direction to the positioning component 4. to the position where it abuts against the recording medium 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 moving or transporting the image forming device 1, and then the paper tray 3 is rotated at a certain angle along the N direction around the connection point of the paper tray 3 and the main body 2, The space occupied by the image forming apparatus 1 is reduced by stowing the paper tray 3 .

However, before the paper tray 3 is put away, if the user forgets to push the positioning part 4 for a certain distance along the X direction, the positioning part 4 is inserted into the paper inlet 20, or the paper tray 3 is positioned after the paper tray 3 is put away. The component 4 can enter into the paper inlet 20 . Then the positioning component 4 will be sandwiched between the paper tray 3 and the side surface 21 of the main body 2, so that the paper tray 3 cannot be stowed.

【Content of invention】

The present invention provides a paper tray on an image forming device, and the paper tray includes:

A positioning component, the positioning component includes three parts: a blocking part, a sliding part and an elastic part, the blocking part is used to block the recording medium in the paper tray, and the elastic part is in contact with the blocking part and the sliding part respectively ;

an installation slot, the installation slot is set on the paper tray, and the sliding part is installed in the installation slot;

When the positioning component is in contact with the side wall of the image forming device, it can be retracted, so that the paper tray can be retracted to the image forming device without hindrance.

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

The positioning component provided by the present invention can be automatically retracted during the retraction process of the paper tray, thereby preventing the positioning component from interfering with the paper tray and making the paper tray unable to be retracted.

【Description of drawings】

FIG. 1 is a schematic structural diagram of an image forming device in the prior art;

Figure 2 is a schematic structural view of the first positioning component involved in the present invention;

Figure 3 and Figure 4 are schematic diagrams showing the assembly of the first positioning component involved in the present invention;

5 and 6 are schematic diagrams showing the movement process of the first positioning component involved in the present invention;

Fig. 7 is a schematic structural diagram of the second positioning component involved in the present invention;

Fig. 8 is a schematic diagram showing the assembly of the second positioning component involved in the present invention;

Fig. 9 and Fig. 10 are schematic diagrams showing the movement process of the second positioning component involved in the present invention;

Fig. 11 is a schematic structural diagram of the third positioning component involved in the present invention;

Shown in Fig. 12 to Fig. 15 is the partial view of Fig. 11 respectively;

Figure 16 is a schematic diagram of the assembly of the third positioning component involved in the present invention;

Figure 17 shows a partial view of Figure 16;

Figure 18 and Figure 19 are schematic diagrams showing the movement process of the third positioning component involved in the present invention;

Fig. 20 to Fig. 22 are schematic diagrams of the structure of the paper feeding wheel in the prior art;

Fig. 23 and Fig. 24 are schematic diagrams showing the structure of the first paper-feeding roller involved in the present invention;

Fig. 25 and Fig. 26 are schematic diagrams showing the structure of the second paper feeding wheel involved in the present invention;

Fig. 27 and Fig. 28 are schematic diagrams showing the structure of the third paper feeding wheel involved in the present invention;

FIG. 29 is a schematic structural diagram of an image forming device involved in the present invention;

Fig. 30 and Fig. 31 are schematic diagrams showing the process of installing the process cartridge to the image forming device in the prior art related to the present invention;

Figure 32 is a schematic structural view of the process box involved in the present invention;

Fig. 33 is a schematic diagram of cooperation between the process cartridge and the lower bottom plate of the image forming device according to the present invention;

【Detailed ways】

Fig. 1 is a schematic structural diagram of an image forming device in the prior art; Fig. 2 is a schematic structural diagram of the first positioning component involved in the present invention; Fig. 3 is a schematic diagram of the movement process of the first positioning component involved in the present invention .

The present invention provides the first positioning component, so that the paper tray 3 can be automatically retracted after the positioning component abuts against the side 21 in the process of retracting the paper tray 3, so as to avoid being caught between the paper tray 3 and the side 21 and causing the paper tray 3 Cannot be collapsed.

As shown in FIG. 2 , the first positioning component 40 includes a blocking portion 401 , a connecting pin 403 , an elastic member 406 and a sliding portion 408 . The blocking portion 401 is used to abut against the recording medium on the paper tray 3 to prevent the recording medium from moving in the opposite direction along the X direction. The sliding portion 408 can slide in the mounting groove 31 along the X direction or in the reverse direction along the X direction. The blocking portion 401 and the sliding part 408 are rotatably connected. Preferably, the blocking portion 401 is a plate-shaped structure, and two first connecting holes 402 for rotatably connecting with the sliding portion 408 are provided at one end of the blocking portion 401, and the two first connecting holes 402 are respectively provided on the blocking portion 401. One side along the X direction and the opposite side along the X direction, and the axes of the two first connecting holes 402 are coaxial; the connecting pin 403 is a cylindrical structure, and its cross-sectional shape perpendicular to the axial direction is the same as that of the first The cross-sectional shape of the connecting hole 402 perpendicular to the axial direction is basically the same; preferably, the elastic member 406 is a torsion spring; the sliding part 408 is a plate-shaped structure, and slide rails 407 are arranged on both sides of the sliding part 408 along the direction parallel to the Z direction. Two second connecting holes 405 are provided on one side of the sliding part 408 along the Z direction, and the two second connecting holes 405 are respectively provided on one side of the sliding part 408 along the X direction and the opposite side along the X direction, and The axes of the two second connecting holes 405 are coaxial, and the cross-sectional shape of the second connecting hole 405 perpendicular to the axial direction is basically the same as the cross-sectional shape of the connecting pin 403 perpendicular to the axial direction; Connecting portion 404, and mounting column 409, the first abutting portion 404 is used to limit the rotation angle of the blocking portion 401 relative to the sliding portion 408, and the mounting column 409 is used to install the elastic member 406, preferably, the first abutting portion 404 and the installation The post 409 is provided on the opposite side of the slider 408 in the X direction.

The assembly relationship among the parts of the first type of positioning component 40 will be described in detail below.

As shown in FIG. 3 , move the blocking part 401 so that one of the two first connection holes 402 of the blocking part 401 is located on one side of the sliding part 408 along the X direction, and the other is located on the opposite side of the sliding part 408 along the X direction. side, and make the first connection hole 402 and the second connection hole 405 overlap in the X direction. Then insert one of the two connecting pins 403 into the first connecting hole 402 on the opposite side of the blocking part 401 along the X direction and the second connecting hole 405 on the opposite side of the sliding part 408 along the X direction along the X direction, Another connecting pin 403 is inserted into the first connecting hole 402 on the opposite side of the blocking part 401 along the X direction and the second connecting hole 405 on the side of the sliding part 408 along the X direction along the opposite side of the X direction, so that the blocking part 401 It is rotatably connected with the sliding part 408 ; then the elastic member 406 is sleeved on the mounting post 409 , so that one end of the elastic member 406 abuts on the sliding part 408 and the other end abuts on the blocking part 401 . The elastic member 406 exerts an elastic force on the blocking portion 401 , so that the blocking portion 401 rotates relative to the sliding portion 408 along the M direction around the axis of the connecting pin 403 to a position where it abuts against the first abutting portion 404 . At this time, the side surface of the blocking portion 401 along the X direction is substantially perpendicular to the X direction, the maximum angle formed between the blocking portion 401 and the sliding portion 408 is δ, and δ is less than 90 degrees, and the first positioning component 40 is in the first position. a location.

Figure 4 is a schematic diagram of the assembly of the first positioning component; Figures 5 and 6 are schematic diagrams of the movement process of the first positioning component; for ease of observation, some structures are not shown in the drawings.

As shown in Fig. 4-Fig. 6, in the installation groove 31 of the paper tray 3, a first sliding rail 407 matching with the sliding part 408 is provided along one side of the Z direction and a side opposite to the X direction. The guide groove 32 is provided with an opening on one side of the installation groove 31 along the X direction or on the opposite side along the X direction. The first positioning component 40 can be installed into the installation groove 31 through the opening, and the sliding part 408 The slide rail 407 is matched with the first guide groove 32 of the installation groove 31, so that the first positioning component 40 can slide in the first guide groove 32 along the X direction or in the opposite direction along the X direction. In this way, when the recording medium moves reversely along the X direction on the paper tray 3 after being shaken, the blocking portion 401 abutting against the recording medium will exert a reverse force along the X direction on the recording medium, thereby blocking the recording medium of the mobile. In order to prevent the excessive force between the recording medium and the first positioning member 40 from pushing the positioning member to slide, the size of the first guide groove 32 and the slide rail 407 can be set so that the first guide groove 32 and the slide rail 407 is an interference fit, thereby increasing the maximum static friction force and sliding friction force between the first guide groove 32 and the slide rail 407 when the first positioning component 40 slides in the installation groove 31, so that the recording medium and the first The maximum force between the positioning components 40 is smaller than the maximum static friction force between the first guide groove 32 and the slide rail 407 . Preferably, the maximum force between the recording medium and the first positioning component 40 is smaller than the sliding friction force between the first guide groove 32 and the sliding rail 407 .

In the process of putting away the paper tray 3, when the paper tray 3 is rotated at a certain angle relative to the main body 2 along the N direction, as shown in FIG. connected, thereby receiving a force F from the side 21. When the acting force F is large enough, it will push the blocking part 401 around the axis of the connecting pin 403 relative to the sliding part 408 to rotate in the opposite direction in the M direction, thereby reducing the maximum distance between the blocking part 401 and the paper tray 3, and making the paper The disk 3 can continue to rotate in the N direction. When the blocking part 401 is pushed by the force F and rotates to the set position relative to the sliding part 408 around the axis of the connecting pin 403 in the direction M, as shown in FIG. 6 , the paper tray 3 is completely retracted. At this time, the first positioning component 40 is in the second position.

The present invention also provides a second type of positioning component, so that during the process of retracting the paper tray 3, the positioning component can be automatically retracted after abutting against the side 21, thereby avoiding being caught between the paper tray 3 and the side 21 and causing the paper tray 3 Cannot be collapsed.

Figure 7 is a schematic structural diagram of the second positioning component involved in the present invention; Figure 8 is a schematic assembly diagram of the second positioning component involved in the present invention; Figure 9 and Figure 10 are the second positioning components involved in the present invention Schematic diagram of the motion process of the components. For ease of observation, some structures in the drawings are not shown.

As shown in FIG. 7 , the second positioning component 41 includes a blocking portion 410 , an elastic member 416 and a gear 415 . The blocking part 410 is used to abut against the recording medium on the paper tray 3 to prevent the recording medium from moving in the opposite direction in the X direction after being shaken. 414 and a first support shaft 411 and a second support shaft 412 made on the paper tray 3 for rotation. Preferably, the blocking portion 410 is a plate-shaped structure, the first supporting shaft 411 is arranged on one side of the blocking portion 410 along the Z direction, the second supporting shaft 412 is arranged on the opposite side along the Z direction, and the first supporting shaft 411 and The second support shaft 412 is a cylindrical structure, 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, One end abuts against the blocking portion 410 . Preferably, on the opposite side of the blocking portion 410 along the Z direction, a third abutting portion 413 protruding in the opposite direction toward the Z direction is further provided, and one end of the elastic member 416 abuts on the third abutting portion 413 . A circular hole 4151 coaxial with the axis of the gear 415 is provided on the gear 415. The diameter of the circular hole 4151 is substantially the same as that of the second support shaft 412. After the elastic member 416 is sleeved on the second support shaft 412, Then the gear 415 is sleeved on the second support shaft 412 .

Corresponding to the first support shaft 411 and the second support shaft 412 on the second type of positioning component 41, a first slide groove 35 is provided on one side of the installation groove 31 along the Z direction, and on the opposite side along the Z direction A second chute 33 is provided. Preferably, a rack 34 extending along the X direction is provided on one side of the second chute 33 along the thickness direction of the paper tray 3 , and the rack 34 can mesh with the gear 415 .

When the second positioning component 41 is installed in the installation groove 31 of the paper tray 3, as shown in Figure 7 and Figure 8, the positioning component 41 is moved to the opening of the installation groove 31 along the X direction, so that the positioning component 41 The first support shaft 411 corresponds to the opening of the first slide slot 35 along the X direction, and the second support shaft 412 corresponds to the opening of the second slide slot 33 along the X direction. Then the positioning component 41 is moved in the opposite direction along the X direction, so that the first support shaft 411 of the second positioning component 41 enters the first sliding groove 35, and the second supporting shaft 412 sleeved on it enters the second sliding groove 33, and the gear 415 sleeved on the second support shaft 412 is engaged with the rack 34 provided in the second sliding groove 33, and the other end of the elastic member 416 abuts against the bottom surface 311 of the installation groove 31.

By setting the size 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, thereby increasing the size of the first support shaft 411 and the first chute. 35 between the maximum static friction and sliding friction, so that the maximum force between the recording medium and the second positioning component 41 is smaller than the maximum static friction between the first support shaft 411 and the first sliding groove 35 . Or, by setting the gears of the gear 415, an interference fit is formed between the gear 415 and the second chute 33, thereby increasing the maximum static friction and sliding friction between the gear 415 and the second chute 33, so that The maximum force between the recording medium and the second positioning component 41 is smaller than the maximum static friction force between the first guide groove 32 and the sliding rail 407 . In addition, through the cooperation between the gear 415 and the rack 34 , the axes of the first support shaft 411 and the second support shaft 412 are basically kept parallel to the Z direction.

By abutting one end of the elastic member 416 on the blocking portion 410 and the other end abutting on the bottom surface 311 of the mounting groove 31, the elastic member 416 exerts a force on the blocking portion 410, so that the blocking portion 410 surrounds the first support The axes of the shaft 411 and the second support shaft 412 rotate along the K direction until the second abutting portion 414 provided on the blocking portion 410 abuts against the bottom surface 311 of the mounting groove 31 , and the blocking portion 410 stops rotating. At this time, as shown in FIG. 9 , the side surface 4101 of the blocking portion 410 along the X direction is perpendicular to the X direction, and the second-type position member 41 is in the first position.

When the paper tray 3 rotates relative to the main body 2 in the N direction to collect the paper tray 3, as shown in FIG. An active force F1 will push the blocking part 410 around the axis of the second support shaft 412 to rotate in the opposite direction of the paper tray 3 in the K direction, so that the paper tray 3 can continue to rotate in the N direction. When the blocking part 410 is rotated to the set position under the action of the force F1 and the paper tray 3 is completely retracted, the second positioning component 41 is in the second position.

The present invention also provides a third positioning component, so that the positioning component can automatically move to one end of the paper tray 3 along the X direction during the process of retracting the paper tray 3, so as to avoid being caught between the paper tray 3 and the side 21 and causing the paper tray to 3 cannot be stowed.

FIG. 11 is a schematic structural view of the third positioning component provided by the present invention; FIGS. 12 to 15 are partial views of FIG. 11 .

As shown in FIG. 11 and FIG. 12 , the third positioning component 42 includes a blocking component 420 , a positioning slider 373 , an elastic member 375 , a first pulling component 371 and a second pulling component 372 . The blocking part 420 includes a blocking part 4201 and a sliding part 4202. A guide rail 421 is provided on one side of the sliding part 4202 along the Z direction and a side opposite to the Z direction; 372 connected to the tensioned part 423 and the positioned part 422 for abutting against the positioning slider 373 . Preferably, the positioned portion 422 is the positioned portion 422 disposed on the guide rail 421 , and the tensioned portion 423 is a hook disposed on one side of the sliding portion 4202 along the X direction. The positioning slider 373 slides relative to the blocking component 420 and contacts the blocking component 420 to position the blocking component 420. Preferably, the positioning slider 373 faces one side of the blocking component 420 along the X direction and the opposite side along the X direction. One side is set as an inclined sliding surface. 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. Preferably, the elastic member 375 is a spring. The first pulling part 371 is connected with the positioning slider 373 to pull the positioning slider 373 to move. Preferably, the first pulling part 371 is a linear structure. The second pulling member 372 is connected to the tension receiving portion 423 of the blocking member 420 to pull the blocking member 420 to move in the X direction. Preferably, the second pulling member 372 is a linear structure made of elastic material.

Corresponding to the first pulling member 371 and the positioning slider 373, as shown in FIG. The second guide slot 321 and the third guide slot 323 , the second guide slot 321 is used to accommodate the first pulling member 371 , and the third guide slot 323 is used to accommodate the positioning slider 373 . The second guide slot 321 extends toward one end of the paper tray 3 along the X direction, and has an opening at one end of the paper tray 3 along the X direction; the third guide slot 323 extends toward the installation slot 31 and communicates with the installation slot 31 . Preferably, the extension direction of the second guide groove 321 is parallel to the X direction, and the extension direction of the third guide groove 323 is perpendicular to the X direction (parallel to the Z direction), that is, the positioning slider 373 can move along the Z direction in the third guide groove 323. direction or move in the opposite direction in the Z direction. Preferably, the extension direction of the second guide groove 321 is parallel to the X direction, and the extension direction of the third guide groove 323 is perpendicular to the X direction.

A cover plate 374 is also provided on the paper tray 3, and the cover plate 374 covers the second guide groove 321 and the third guide groove 323 of the paper tray 3, so that the components of the third positioning member 42 can be aligned along the paper tray 3. The displacement in the thickness direction (direction perpendicular to the X direction and the Z direction at the same time) is limited to prevent the parts of the third positioning member 42 from falling off from the paper tray 3. In addition, after the cover plate 374 is installed on the paper tray 3, it can partially cover the end of the installation groove 31 along the Z direction and the end opposite to the Z direction, forming a first guide groove 32 with the installation groove 31, and the first guide groove 32 can Cooperate with the guide rail 421 of the blocking component 420 to make the blocking component 420 slide along the X direction in the installation groove 31 . Preferably, the cover plate 374 is arranged in a "U" shape.

As shown in Fig. 14 and Fig. 15 , a support shaft 39 is provided on one side of the paper tray 3 along the Z direction and on the opposite side along the Z direction. A support hole 29 is also provided on the opposite side along the Z direction. By installing the support shaft 39 into the support hole 29, the paper tray 3 is connected to the main body 2, and the paper tray 3 can be opposite to each other around the axis of the support shaft 39. Body 2 rotates.

The following will describe in detail the assembly relationship between the components of the third type of positioning component provided by the present invention, the paper tray 3 and the cover plate 374 .

As shown in Figure 16 and Figure 17, one end of the first pulling member 371 is connected to the end of the positioning slider 373 away from the blocking member 420 through the elastic member 375, and the connection method can be pasting, welding, screw connection, or directly Tie one end of the first pulling part 371 of the linear structure to the end of the positioning slider 373 away from the blocking part 420, which may be determined according to the structure of the first pulling part 371 and the positioning slider 373, which is not limited by the present invention. The other end of the first pulling member 371 is connected to the main body 2 of the image forming apparatus 1 , or to one end of the paper tray 3 along the X direction.

Then the first pulling part 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, and one end of the elastic member 375 abuts against the positioning slider 373 away from the installation groove 31 The other end abuts against the inner wall of the third guide groove 323 away from the side of the installation groove 31, so that the elastic member 375 exerts an elastic force on the positioning slider 373, so that the positioning slider 373 moves along the third guide groove. 323 extends out of the third guide groove 323 toward the installation groove 31 . When the first pulling part 371 slides along the X direction in the second guide slot 321 , it will pull the positioning slider 373 to move away from the installation slot 31 along the third guide slot 323 .

Afterwards, the "U"-shaped cover plate 374 is installed on the paper tray 3 by means of welding, pasting or screws, the second pulling member 372 is connected to the tension receiving part 423 of the blocking member 420, and the blocking member 420 is pulled out from the installation groove 31. The opening at one end along the X direction is installed in the installation groove 31, and through the cooperation of the guide rail 421 of the blocking member 420 and the first guide groove 32, the blocking member 420 can move along the X direction or in the direction opposite to the X direction in the installation groove 31. slide. Finally, the first pulling part 371 is connected to the main body 2 of the image forming apparatus 1 (as shown in FIG. 18 ). Connect the other end of the second pulling member 372 to the main body 2 of the image forming apparatus 1 , or directly connect the second pulling member 372 to one end of the paper tray 3 along the X direction. Since the second pulling member 372 is made of elastic material, when the blocking member 420 is in contact with the recording medium, the second pulling member 372 is in a stretched state and exerts an elastic force along the X direction on the blocking portion.

When the image forming apparatus 1 is in the working state, as shown in FIG. 17 , the paper tray 3 is in the working position, under the action of the elastic member 375 and the first pulling member 371, the end of the positioning slider 373 close to the installation groove 31 protrudes to outside the third guide groove 323 . After the recording medium is placed 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 end of the positioning slider 373 protruding outside the third guide groove 323, the blocking member 420 will exert an action on the inclined sliding surface on the opposite side of the end along the X direction. The force makes the positioning slider 373 shrink into the third guide groove 323 toward the direction away from the installation groove 31 . When the blocking member 420 is moved to the position where the blocking portion 4201 is in contact with the recording medium, the positioned portion 422 provided on the guide rail 421 is opposite to the third guide groove 323, and the active force of the guide rail 421 on the positioning slider 373 disappears, and the positioning Under the action of the elastic member 375, the slider 373 protrudes toward the installation groove 31 and is inserted into the positioned portion 422, so as to position the blocking member 420. The blocking member 420 needs to be moved along the X direction or in the opposite direction along the X direction. The larger active force can slide in the mounting groove 31 . At this time, as shown in FIG. 18 , the length of the first pulling part 371 outside the second guide groove 321 is L1, that is, the connection point R between the first pulling part 371 and the main body 2 to the point where the first pulling part 371 is located in the second guide groove. The distance between points T at the openings of 321 along the X direction is L1.

When the paper tray 3 needs to be put away, as shown in FIG. 19, after the paper tray 3 is rotated to the set position along the N direction around the support shaft 39, the length of the first pulling part 371 outside the second guide groove 321 is L2, that is, the distance between the connection point R of the first pulling member 371 and the main body 2 to the point T of the first pulling member 371 at the opening of the second guide groove 321 along the X direction is L2. Since L2 is greater than L1, that is, when the paper tray 3 rotates in the N direction around the support shaft 39, the first pulling member 371 will move in the X direction in the second guide groove 321, thereby pulling the positioning slider 373 along the first direction. The three guide grooves 323 move toward the direction away from the mounting groove 31, so that the positioning slider 373 is drawn out from the positioned portion 422 of the blocking member 420, and the positioning effect of the positioning slider 373 on the blocking member 420 disappears, and the blocking member 420 needs to be positioned along the X. direction or in the opposite direction along the X direction, it can slide in the mounting groove 31 only when a small force is applied. At this time, since the second pulling member 372 made of elastic material is in a stretched state, the second pulling member 372 exerts a force towards the X direction on the blocking member 420, and the positioning slider that is not positioned by the positioning slider 373 373 slides along the X direction to one end of the paper tray 3 along the X direction under the action of the second pulling member 372, so that when the paper tray 3 is retracted, the blocking member 420 can enter the paper inlet 20 of the main body 2 to avoid The blocking member 420 is sandwiched between the paper tray 3 and the side surface 21 .

As shown in Figures 18 and 19, a connecting line RS is formed between the connection point R between the first pulling member 371 and the main body 2 and the axis S of the support shaft 39, and the axis S of the support shaft 39 and the first pulling member 371 are located at A connecting line ST is formed between the points T at the openings of the second guiding groove 321 along the X direction. When the paper tray 3 is in the working position, the angle formed between the connecting line RS and the connecting line ST is α. The angle formed between them is β. In order to ensure that the distance L2 is greater than L1, the included angle α should be smaller than the included angle β. Preferably, the point T is located downstream of the connection point R in the rotation direction N around the axis S.

For different types of recording media, the blocking member 420 needs to move to different positions in the installation groove 31 to abut against the opposite end of the recording medium along the X direction. In the present invention, a plurality of positioning sliders 373 are provided in the installation groove 31 along the X direction, and the opposite end of the first pulling member 371 along the X direction can be provided with multiple ends connected with the positioning sliders 373 . When the first pulling part 371 located in the second guide groove 321 slides along the X direction, the first pulling part 371 simultaneously pulls the plurality of positioning sliders 373 to move away from the installation groove 31 .

In addition, in order to enhance the positioning performance of the positioning slider 373 on the blocking member 420, preferably, the positioned portion 422 can be provided on the blocking member 420 along the Z direction and on the guide rail 421 opposite to the Z direction at the same time, and the mounting groove 31 along the One side in the Z direction and the opposite side in the Z direction are provided with a positioning slider 373 at the same time.

For the first positioning component 40 and the second positioning component 41, after the paper tray 3 is put away, the side 21 always exerts a force on the first positioning component 40 or the second positioning component 41, and the force will be Transferred to the paper tray 3, the paper tray 3 is reversely rotated in the N direction relative to the main body 2, so that the paper tray 3 cannot be stowed. In order to avoid the above situation, the present invention is also provided with a detachable buckle between the paper tray 3 and the main body 2. Through the function of the detachable buckle, the paper tray 3 after being put away can only be released after being subjected to a certain force. is opened.

Specifically, as shown in FIG. 14 , an elastic arm 38 is provided on one side of the paper tray 3 along the Z direction and on the opposite side along the Z direction. The out positioning protrusion 381. Preferably, the elastic arm 38 is made of plastic material and integrated with the paper tray 3; one end of the positioning protrusion 381 along its protruding direction is arranged as an arc surface. Corresponding to the positioning protrusion 381 of the elastic arm 38, a positioning hole 28 (as shown in FIG. ). After the paper tray 3 is installed on the main body 2, the positioning protrusion 381 of the elastic arm 38 abuts against the inner wall of the main body 2, and the positioning protrusion 381 is pressed by the main body 2 to push the elastic arm 38 toward the positioning protrusion 381 Reverse swing in the protruding direction; when the paper tray 3 is closed, the positioning protrusion 381 rotates to the position corresponding to the positioning hole 28, the force of the main body 2 on the positioning protrusion 381 disappears, and the elastic arm 38 faces the positioning protrusion The protruding direction of 381 swings, so that the positioning protrusion 381 enters into the positioning hole 28 , thereby positioning the paper tray 3 . When it is necessary to open the paper tray 3, a certain force is applied to the paper tray 3, so that the arc surface of the positioning protrusion 381 abuts against the edge of the positioning hole 28 and there is a pressing force. When the force is large enough, the pressing force will squeeze the positioning protrusion 381, so that the elastic arm 38 swings in the opposite direction toward 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 be moved relative to the main body. 2 Reverse rotation along the N direction.

In the prior art, as shown in FIG. 1 , the paper outlet 201 of the main body 2 of the image forming apparatus 1 is further provided with paper feed rollers 6 for transporting recording media, including upper paper feed rollers 61 and lower paper feed rollers 62 . The upper paper feed roller 61 and the lower paper feed roller 62 abut against each other, and the recording medium sandwiched between the upper paper feed roller 61 and the lower paper feed roller 62 is transported by rotating the upper paper feed roller 61 and the lower paper feed roller 62 . As shown in Figure 20 and Figure 21, the upper paper feed wheel 61 is rotatably supported on the main body 2 through the rotating shafts 611 arranged at both ends, and its rotation axis is fixed relative to the position of the main body 2; The rotating shafts 621 at the two ends of the paper wheel 62 are rotatably supported on the supporting mechanism, and there are a plurality of them, which are symmetrical about the axis of symmetry H1. The supporting mechanism is arranged on the inner wall 22 at the lower side of the paper outlet 201 , and includes a supporting frame 63 , a limiting portion 65 and a spring 66 . The rotating shaft 621 of the lower paper feeding roller 62 is rotatably supported on the supporting frame 63, and the two ends of the supporting frame 63 are provided with restricted parts, and the restricted parts are cylindrical protrusions 631 protruding in a direction away from the axis of symmetry H1. . The limit part 65 is used to limit the movement of the support frame 63, and its number is two, which are respectively arranged on both sides of the support frame 63. The limit part 65 is provided with a limit groove 651 extending along the Y direction to support The cylindrical protrusions 631 on both sides of the frame 63 are located in the limiting groove 651 of the limiting portion 65 . The spring 66 is arranged between the support frame 63 and the inner wall 22, one end of which abuts against the inner wall 22, and the other end abuts against the support frame 63, and exerts an elastic force on the support frame 63 to push the support frame 63 and lower the paper. The wheel 62 protrudes 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 working process of the image forming apparatus 1, as shown in FIG. 22 , the support frame 3 may be vibrated and tilted, and the rotation axis of the lower paper feed roller 62 is not parallel to the rotation axis of the upper paper feed roller 61, resulting in The pressure between the lower paper feeding roller 62 inclined towards the upper paper feeding roller 61 and the upper paper feeding roller 61 will increase. When the recording medium with the developer image passes through the upper paper feeding roller 61 and the lower paper feeding roller 62, the lower paper feeding roller 62 with excessive pressure between the upper paper feeding roller 61 may scratch the developer on the recording medium. agent image.

In order to avoid the above situation, the present invention provides a first support mechanism, which prevents the support frame from being vibrated and tilted during the working process 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 mode between the support frame 630 and the lower roller 62 and the elastic member 66 are basically the same as those of the prior art, the difference mainly lies in the structures of the support frame 630 and the limiting portion 67 . The restricted portion of the support frame 630 of the first support mechanism provided by the present invention is the elongated protrusion 632 extending along the Y direction at both ends of the support frame 630 , and the elongated protrusion 632 on the support frame 630 Correspondingly, a limiting slide 671 is provided on the opposite side of the two limiting parts 67, and the shape of the cross section of the elongated protrusion 632 perpendicular to the Y direction is the same as that of the cross section of the limiting slide 671 perpendicular to the Y direction. basically the same. Preferably, the shape of the cross section of the positioning protrusion 432 and the limit slide groove 671 perpendicular to the Y direction is rectangular, and after the support frame 630 is installed on the limit portion 67, the elongated protrusion 632 and the limit slide The grooves 671 substantially overlap in the Y direction. By making the outer surface of the elongated protrusion 632 fit closely with the inner surface of the limiting chute 671 , the limiting support frame 630 can only slide along the Y direction or in the opposite direction along the Y direction without swinging.

The present invention also provides a second support mechanism, which prevents the support frame from tilting due to vibration during the working process of the image forming device.

As shown in FIG. 25 and FIG. 26 , the second support mechanism includes a support frame 633 , an elastic member 68 and a limiting portion 65 . The structure of the limiting part 65 and the connection mode between the limiting part 65 and the support frame 633 are basically the same as those of the prior art. department. The elastic member 68 is a double spring, comprising a first support arm 681 positioned at the middle of the elastic member 68 and a second support arm 682 and a third support arm 683 positioned at both ends of the elastic member 68, the second support arm 682 and the third support arm 683 The shapes are basically the same. Preferably, the installation part of the support frame 633 includes two extension parts 634 provided on the opposite side of the support frame 633 along the Y direction, and the installation shaft 636 supported on the extension parts 634 . The two protruding parts 634 are respectively provided at both ends of the supporting frame 633 along the axis direction of the lower roller 62 , and mounting holes 635 are provided on the protruding parts 634 . Preferably, the cross-sectional shape of the mounting shaft 636 is substantially the same as that of the mounting hole 635 . In the process of assembling the second supporting mechanism, the installation shaft 636 is passed through the installation hole 635 on an extension 634, and then the elastic member 68 is sleeved on the installation shaft 636, so that the first support arm 681 of the elastic member 68 Supported on the support frame 633, then pass the installation shaft 636 through the installation hole 635 of the other protruding part 634, and finally, install the support frame 633 with the lower roller 62 in the limit groove 651 of the limit part 65, 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 basically the same as those in the prior art, and will not be repeated here.

When the second support arm 682 and the third support arm 683 abut against the inner wall 22, they will be respectively subjected to the forces F3 and F4 exerted by the inner wall 22. Since the shapes of the second support arm 682 and the third support arm 683 are basically the same, The magnitude and direction of the acting forces F3 and F4 are also basically the same, and they are symmetrical about the axis of symmetry H1, so that the two ends of the lower roller 62 along the axial direction of the lower roller 62 are subjected to the same magnitude and direction of acting forces, thereby avoiding the support frame 633 from being vibrated Afterwards, it is easy to incline relative to the upper roller 61.

The present invention also provides a third support mechanism, which prevents the support frame from tilting due to vibration during the working process of the image forming device.

As shown in FIG. 27 and FIG. 28 , the third support mechanism includes a support frame 63 , a limiting portion 65 , an elastic member 69 and a mounting portion for installing the elastic member 69 . The structures of the limiting portion 65 and the supporting frame 63 are basically the same as those of the prior art, and the main difference lies in the elastic member 69 and the mounting portion. The elastic member 69 is a double torsion spring, including a fourth support arm 691 located in the middle of the double torsion spring 69, a fifth support arm 692 and a sixth support arm 693 located at both ends of the double torsion spring 68, the fifth support arm 692 and the sixth support arm The arms 693 are substantially the same shape. The installation part is disposed on the inner wall 22 and includes the support part 24 and the installation shaft 637 for installing the elastic member 69 . The support part 24 is also provided with the installation hole 25 . Preferably, there are two supporting parts 24, which are symmetrical about the axis of symmetry H1, the shape of the mounting hole 25 on the supporting part 24 is basically the same as the cross-sectional shape of the mounting shaft 637, and the length of the double torsion spring 68 along the axial direction The distance between the two supporting parts 24 is substantially the same. In the process of assembling the third support mechanism, the installation shaft 637 is passed through the installation hole 25 of a support part 24, and then the elastic member 69 is sleeved on the installation shaft 637, so that the fourth support arm 691 in the middle of the elastic member 69 is supported on On the inner wall 22 , 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 . Afterwards, the support frame 63 on which the lower roller 62 is installed is installed on the stopper 65, so that the fifth support arm 692 and the sixth support arm 693 located at both ends of the elastic member 69 are respectively connected to the cylindrical projections 631 on both sides of the support frame 63. Abut. 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 basically the same as those in the prior art.

When the fifth support arm 692 and the sixth support arm 693 at the two ends of the elastic member 69 abut against the cylindrical protrusions 631 on both sides of the support frame 63 respectively, the cylindrical protrusions 631 on both sides of the support frame 63 will be respectively supported by the fifth The force F5 and F6 exerted by the support arm 692 and the sixth support arm 693, because the elastic member 69 is symmetrical about the axis of symmetry H1, the magnitude and direction of the force F5 and F6 are basically the same, and are symmetrical about the axis of symmetry H1, so that the lower roller The two ends of 62 along the axial direction of the lower roller 62 are subjected to the same force in magnitude and direction, so as to prevent the supporting frame from easily tilting relative to the upper roller 61 after being vibrated by 63 .

In the prior 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 . In the main body 2 of image forming apparatus 1, be provided with the space 23 that is used to accommodate process box 7, also be provided with first guide rail 27 and second guide rail 28 (as shown in the figure) 30) for guiding the installation of the process cartridge 7 to the main body 2. As shown in Figure 30, the end portion of the longitudinal direction of the process cartridge 7 is provided with a guide portion for supporting on the guide rail 27, specifically, the guide portion includes a first guide portion 71 arranged at one end of the longitudinal direction of the process cartridge 7 and a second guide portion 72 , and a third guide portion 73 and a fourth guide portion 74 provided at the other end in the lengthwise direction of the process cartridge 7 . When the process box 7 needs to be installed in the main body 2 along the direction Q, the user usually grasps the third guide portion 73 of the process box 7 with his hand, and moves the process box 7 to the opening of the space 23, so that the process box The first guide part 71 and the second guide part 72 of 7 are supported on the second guide rail 28, the third guide part 73 and the fourth guide part 74 are supported on the first guide rail 27, and then the user follows the first guide rail 27 and The second guide rail 28 moves the process cartridge 7 so that the process cartridge 7 can move to a predetermined position in the direction Q within the main body 2 .

However, since the shell of the process box 7 is usually made of plastic material, it has certain elasticity, and the length of the process box 7 in the longitudinal direction is much larger than the length of the process box 7 in the installation direction. As shown in Figure 31, if the user's hand shakes during the movement of the process cartridge 7 on the guide rail 27, it is likely to cause the process cartridge 7 to deflect in the relative direction Q, so that the guide portion of the process cartridge 7 is aligned with the guide rail 27. The guide rail 27 breaks away, and then the process box 7 cannot be installed in place, and even gets stuck on the guide rail.

In order to avoid the above situation, the present invention provides a guide mechanism to prevent the process cartridge from deflecting during the process of installing the process cartridge into the main body of the image forming apparatus, so that the process cartridge cannot be installed in place.

The guiding mechanism provided by the present invention includes a guiding part arranged on the main body of the image forming apparatus and a guided part arranged on the process cartridge. When the process cartridge is installed on the main body of the image forming apparatus, the guiding part on the main body and the The guided portions on the process cartridge cooperate with each other, thereby preventing the process cartridge from deflecting.

Specifically, as shown in FIGS. 30 and 32 , a lower plate 25 is provided in the main body 2 . When the process cartridge 7 is installed in the main body 2 , the lower plate 25 is located below the process cartridge 7 and close to the process cartridge 7 . The guide part on the main body 2 is the guide groove 26 that is arranged on the lower plate 25 of the main body 2 and extends backward along the installation of the process box 8; On the opposite surface of the lower plate 25, there is a guide plate 81 protruding toward the lower plate 25, and the guide plate 81 is substantially perpendicular to the length direction of the process cartridge 8. As shown in FIG. Preferably, the width of the guide plate 81 is substantially equal to the width of the guide groove 26 in the lengthwise direction of the process cartridge 8 . The guide plate 81 on the process box 8 corresponds to the guide groove 26 on the lower plate 25 of the main body 2, that is, as shown in FIG. Inside the guide groove 26 , the opposite sides of the guide plate 81 along the length of the process box 8 are attached to the two sides of the guide groove 26 along the length of the process box 8 . In this way, 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 can only move along the direction Q, so that the process cartridge 8 can only move along the direction Q. Of course, a plurality of guide grooves 26 may be provided on the lower plate 25 , and a plurality of guide plates 81 may be correspondingly provided on the process box 8 , so as to enhance the restrictive effect of the guide grooves 26 on the guide plates 81 .

In addition, it is also possible to increase the distance between the first guide portion 71 and the second guide portion 72 and/or increase the distance between the third guide portion 73 and the fourth guide portion 74, by abutting the guide portion against the inner wall of the space 23 , can prevent the process box 7 from swinging at an excessive angle and falling off from the guide rail 27 or being stuck on the guide rail 27.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (23)

1. A paper tray used on an image forming device, wherein the paper tray comprises: A positioning component, the positioning component includes three parts: a blocking part, a sliding part and an elastic part, the blocking part is used to block the recording medium in the paper tray, and the elastic part is in contact with the blocking part and the sliding part respectively ; an installation slot, the installation slot is set on the paper tray, and the sliding part is installed in the installation slot; When the positioning component is in contact with the side wall of the image forming device, it can be retracted, so that the paper tray can be retracted to the image forming device without hindrance. 2. The paper tray according to claim 1, characterized in that, the blocking part is further provided with two coaxial first connecting holes, and the sliding part is further provided with two coaxial first connecting holes. The second connecting hole, the first connecting hole and the second connecting hole are connected by a connecting pin, so that the blocking part and the sliding part are rotatably connected; the connecting pin is a cylindrical structure And its cross-sectional shape perpendicular to the axial direction is substantially the same as the cross-sectional shape of the first connecting hole perpendicular to the axial direction and/or the cross-sectional shape of the second connecting hole perpendicular to the axial direction. 3. The paper tray according to claim 1, wherein a slide rail is also provided on the sliding part; a first guide groove is also provided on the installation groove; the installation groove and the slide rail An interference fit is adopted between them, so that the maximum force between the recording medium and the positioning member is smaller than the maximum friction force between the slide rail and the first guide groove. 4. The paper tray according to claim 1, wherein the sliding part is further provided with a first abutting part for limiting the relative angle between the blocking part and the sliding part and for A mounting post for installing the elastic member; the blocking portion and the mounting post are located on the sliding portion in a direction away from the recording medium. 5. A paper tray used on an image forming device, wherein the paper tray comprises: A positioning component, the positioning component includes three parts: a blocking portion, an elastic member and a gear, the blocking portion is used to block the recording medium in the paper tray, and the elastic member is used to restrict the movable range of the blocking portion; An installation groove, the installation groove is arranged on the paper tray, a second chute is arranged on the installation groove, a rack is also arranged on the second chute, and the rack meshes with the gear; When the positioning component is in contact with the side wall of the image forming device, it can be retracted, so that the paper tray can be retracted to the image forming device without hindrance. 6. The paper tray according to claim 5, wherein a second abutting portion is provided on the blocking portion, and the second abutting portion can be abutted against the bottom surface of the installation groove so as to constrain rotation of the positioning member. 7. The paper tray according to claim 5, wherein a first support shaft, a second support shaft and a first slide groove are arranged on the blocking part, and the first support shaft is installed into the first support shaft. A chute, the second support shaft is installed into the second chute. 8. The paper tray according to claim 7, characterized in that, the first support shaft and the second support shaft are cylindrical structures and the axis of the first support shaft and the axis of the second support shaft substantially coincident; the elastic member is installed on the second support shaft. 9. The paper tray according to claim 7, characterized in that, an interference fit is formed between the first support shaft and the first chute, so that the recording medium and the positioning member The maximum force is smaller than the maximum static friction force between the first support shaft and the first sliding groove. 10. The paper tray according to claim 5, wherein an interference fit is formed between the gear and the rack, so that the maximum force between the recording medium and the positioning member is smaller than that of the gear Maximum static friction with the rack. 11. The paper tray according to claim 5, wherein one end of the elastic member is in contact with the bottom surface of the installation groove, and the other end is in contact with the blocking portion. 12. A paper tray used on an image forming device, characterized in that the paper tray comprises: The positioning part, the positioning part includes four parts: a blocking part, a positioning slider, an elastic part and a pulling part, the blocking part is used to block the recording medium in the paper tray, the elastic part abuts against the positioning slider, It is used to control the expansion and contraction of the positioning slider in a direction perpendicular to the moving direction of the blocking component; the pulling component controls the movement of the blocking component and/or the positioning slider; The installation groove, the installation groove is set in the telescopic direction of the paper tray, the second guide groove and the third guide groove are also arranged in the installation groove, and the positioning slider is installed on the second guide groove and the in the third channel; A support shaft, the support shaft is arranged at one end of the paper tray close to the image forming device, and a support hole is also provided on the image forming device, and the support shaft is installed into the support hole so that the paper tray can wrap around the Support axis rotation; When the paper tray is retracted, that is, when the paper tray is rotated around the support shaft until the entire paper tray is close to the image forming device, the blocking member can enter the image forming device close to the support shaft into the paper inlet on the 13. The paper tray according to claim 12, wherein the blocking member comprises a blocking portion, a sliding portion, a tensioned portion and a positioned portion; the blocking portion abuts against the recording medium, the The sliding part is located in the installation groove, the tension receiving part is connected with the pulling part, and the positioned part is engaged with the free end of the blocking part; a hook is also arranged on the tension receiving part, and the The tension receiving part is connected with the pulling part through the hook. 14. The paper tray according to claim 12, wherein the pulling member comprises a first pulling member and a second pulling member, the first pulling member is connected to the positioning slider, and the first pulling member Two pulling parts are connected with the blocking part; both the first pulling part and the second pulling part are linear structures. 15. The paper tray according to claim 12, wherein a guide rail is further provided on the blocking member, and the guide rail can enter the installation groove. 16. The paper tray according to claim 12, characterized in that, the paper tray is also provided with a cover plate, the cover plate is a "U"-shaped structure; the cover plate covers the second guide The groove, the third guide groove and the installation groove are perpendicular to the direction of movement of the blocking member, forming a first guide groove; the first guide groove constrains the movement of the positioning slider to prevent the positioning slider from The components on the block are disengaged from the tray. 17. A supporting mechanism for a paper feed roller on an image forming device, characterized in that it is arranged on the inner wall of the lower side of the paper outlet of the image forming device, comprising: a support frame abutting against the paper feeding wheel; A limiting part is used to limit the support frame, and a limiting chute is arranged on the limiting part; an elastic member, one end of which is located at the end of the supporting frame away from the paper feeding roller, and the other end is located on the inner wall of the lower side of the paper outlet; The cross-sectional shape of the support frame and the limit chute in the direction perpendicular to the length direction of the limit chute is basically the same, so the support frame can only approach and move away from the limit chute The direction of the paper feed wheel is translated. 18. The support mechanism as described in claim 17, wherein the cross-sectional shape of the support frame and the limiting chute in a direction perpendicular to the length direction of the limiting chute is a rectangle. 19. A support mechanism for a paper feed roller on an image forming device, characterized in that it is arranged on the inner wall of the lower side of the paper outlet of the image forming device, comprising: A support frame, one end of which abuts against the paper feeding wheel, and the other end is provided with two extensions and a mounting shaft between the two extensions; A limiting part, used to limit the support frame; An elastic member, the elastic member is two identical torsion springs, which are respectively installed on the two ends of the installation shaft on the support frame close to the extension part; one end of the torsion spring is against the installation frame connected, and the other end abuts against the inner wall of the lower side of the paper outlet; The force of the two torsion springs of the elastic member on the extension part is basically equal, so that the extension part will not be inclined due to vibration. 20. A supporting mechanism for a paper feed roller on an image forming device, characterized in that it is arranged on the inner wall of the lower side of the paper outlet of the image forming device, comprising: a support frame abutting against the paper feeding wheel; A limiting part, used to limit the support frame; a mounting part, the mounting part is fixed on the inner wall of the lower side of the paper outlet of the image forming device, and is provided with two supporting parts, and there is a mounting shaft between the supporting parts; an elastic member, the elastic member is a double torsion spring, and the double torsion spring is installed on the installation shaft; The force exerted by the double torsion springs on the support frame is substantially equal, so that the protruding part will not tilt due to vibration. 21. A guide mechanism for an image forming device, comprising: a guide part provided inside the image forming device, the guide part including a guide groove provided on a lower plate of the image forming device; a guided portion provided on the process cartridge casing, the process cartridge is detachably mounted on the image forming device, and the guiding portion includes a guide plate; The guide plate may enter the guide groove so that the process cartridge is installed in the image forming apparatus in a fixed direction. 22. A buckle for a paper tray of an image forming device, characterized in that it comprises: an elastic arm, the elastic arm is arranged on one end of the paper tray close to the supporting shaft of the paper tray; A positioning protrusion, the positioning protrusion is arranged on the elastic arm, and the end of the positioning protrusion away from the elastic arm along its protruding direction is set as an arc surface; a positioning hole, the positioning hole is provided on the main body of the image forming device, near the support hole where the support shaft is installed; The positioning protrusion abuts against the main body of the image forming apparatus, and when the paper tray is closed, that is, when the paper tray is close to the main body of the image forming apparatus, the positioning protrusion enters the positioning hole. 23. An image forming device, characterized in that the image forming device comprises the paper tray according to any one of claims 1 to 16, the supporting mechanism of the paper feed roller according to any one of claims 17 to 20, and the paper tray according to any one of claims 17 to 20. One or more of the guide mechanism in claim 21 and the buckle in claim 22.