CN219031133U - Paper feed cassette and image forming apparatus - Google Patents

Abstract

The application provides a paper feed box, including box body, size detection device and paper baffle. The box body comprises a bottom wall and a side wall, and the bottom wall and the side wall enclose a containing cavity. The dimension detecting device is located on a side of the sidewall facing away from the accommodating chamber and includes a plurality of detectors spaced along a first direction. The paper blocking plate is slidably arranged on the bottom wall along a first direction and extends out of the side wall towards the direction of the size detection device. Each detector includes a detector body and a detector switch connected to the detector body, the detector switch having an end that is retractable away from the detector body as compared to the detector body. A roller is rotatably disposed at an end of the detector switch remote from the detector body. The abutting end of the extending side wall of the paper baffle is in an abutting state or a non-abutting state with a roller in the size detection device in the sliding process of the paper baffle along the first direction. The paper feeding box is beneficial to reducing occupied space and controlling detection precision and reducing the situation of clamping. The application also provides an image forming apparatus.

Description

Paper feed cassette and image forming apparatus

Technical Field

The present application relates to a paper feed cassette and an image forming apparatus using the same.

Background

In an image forming apparatus such as a printer, it is generally necessary to detect the size of a sheet in a sheet feeding cassette in order to print a pattern of a suitable size. However, the paper detection structure in the current image forming apparatus is complicated, occupies a large space while being unfavorable for control of accuracy, and is liable to be jammed during use.

Disclosure of Invention

The application provides a paper feed box and an application image forming equipment of paper feed box, detection structure in the paper feed box constructs succinctly, is favorable to reducing the space that occupies to be favorable to reducing the installation error in order to do benefit to the control of detection precision, still be favorable to reducing the possibility that the card was blocked in the use simultaneously.

A first aspect of embodiments of the present application provides a paper feed cassette including a cassette body, a size detection device, and a paper blocking plate. The box body comprises a bottom wall and a side wall, and the bottom wall and the side wall are surrounded to form a containing cavity. The size detection device is located on one side of the side wall, which faces away from the accommodating cavity, and comprises a plurality of detectors arranged at intervals along a first direction. The paper blocking plate is slidably arranged on the bottom wall along the first direction and extends out of the side wall towards the direction where the size detection device is located. Each detector includes a detector body and a detector switch connected to the detector body, and an end of the detector switch remote from the detector body is retractable as compared to the detector body. A roller is rotatably disposed at an end of the detector switch remote from the detector body. The abutting end of the paper blocking plate extending out of the side wall is in an abutting state or a non-abutting state with the roller in the size detection device in the sliding process of the paper blocking plate along the first direction.

The above-mentioned paper feed box of this application, it stretches out through the paper blocking board the butt end of box body is direct with a plurality of in the size detection device the detector switch cooperation is in order to realize being located the detection of the size of the paper in the holding chamber, its simple structure is favorable to reducing the space that is used for detecting the part occupation of paper size, simultaneously, still is favorable to reducing the installation error that arouses because of detecting part structure complicacy to be favorable to detecting the control of precision. In addition, the tip of detector switch is equipped with rotatable gyro wheel and through the gyro wheel with the butt end cooperates in order to open or close the detector switch is favorable to guaranteeing smooth access between the detector switch with the butt end reduces the condition of blocking between the two.

Based on the first aspect, in one possible implementation manner, a direction in which the paper blocking plate protrudes toward a direction in which the size detection device is located is defined as a second direction, and the first direction is perpendicular to the second direction.

In the above possible implementation manner, the first direction is perpendicular to the second direction, which is favorable for reducing the occupation of the paper blocking board to the space, and is also favorable for abutting the whole part of the paper blocking board in the box body with the edge of the paper in the accommodating cavity, thereby being favorable for more accurately detecting the size of the paper.

Based on the first aspect, in a possible implementation manner, the abutting end includes an abutting region protruding towards the box body and used for abutting against the roller; the abutting region comprises a first inclined portion, an abutting portion and a second inclined portion, and the first inclined portion and the second inclined portion are respectively located at two ends of the abutting portion opposite to each other in the first direction.

In the above possible implementation manner, the first inclined portion and the second inclined portion are respectively provided at two ends of the abutting portion, so that the first inclined portion and the second inclined portion can guide the roller in the sliding process of the paper blocking plate along the first direction, which is beneficial to smoothly sliding the roller to or from the abutting portion, thereby being beneficial to reducing the jamming situation in use.

Based on the first aspect, in one possible implementation manner, a connection between the first inclined portion and the abutting portion is a rounded corner, and a connection between the second inclined portion and the abutting portion is a rounded corner.

In the possible implementation manner, the design of the round angle is further beneficial to the roller to smoothly slide to or smoothly slide away from the abutting portion, so that the blocking condition during use is reduced.

Based on the first aspect, in one possible implementation manner, the number of the abutting regions is a plurality, and any two adjacent abutting regions are spaced apart in the first direction.

In the above possible implementation manner, the plurality of abutting areas may be disposed, so as to detect the size of the paper by abutting the different abutting areas with the rollers on the different detector switches during the sliding process of the paper blocking board along the first direction.

Based on the first aspect, in one possible implementation manner, the plurality of abutting regions include first abutting regions and second abutting regions spaced apart, and the plurality of detectors includes a first detector and a second detector. In the first direction, a distance between a center of the roller on the first detector and a center of the roller on the second detector is D1, a shortest distance between the abutting portion of the first abutting region and the abutting portion of the second abutting region is D2, and a longest distance between the abutting portion of the first abutting region and the abutting portion of the second abutting region is D3, wherein D2 is less than or equal to D1 and less than or equal to D3.

In the possible implementation manner, the design of d2.ltoreq.d1.ltoreq.d3 can realize that the first abutting area and the second abutting area are simultaneously abutted with the roller on the first detector and the roller on the second detector in the process that the paper blocking plate slides along the first direction, so that detection of the size of paper is realized by the fact that the rollers on different numbers of detector switches are abutted or not, and detection of more sizes is realized by setting a smaller number of light-on lights.

Based on the first aspect, in one possible implementation manner, the size detection device further includes a mounting frame, where the mounting frame is located on a side of the sidewall facing away from the accommodating cavity. The detector is arranged on the mounting frame, two buckles are arranged on the mounting frame corresponding to each detector, and the two buckles are clamped with two opposite sides of the detector in the first direction.

In the possible implementation manner, the two buckles are clamped with two opposite sides of the detector in the first direction, so that stability of the detector is kept when the paper blocking plate is abutted back and forth with the detector in the sliding process of the paper blocking plate along the first direction, the possibility that the detector is loosened due to abutting friction of the paper blocking plate in the first direction is reduced, and detection accuracy is guaranteed.

Based on the first aspect, in one possible implementation manner, the detector main body of each detector is provided with a positioning hole, and the mounting frame is further provided with a positioning piece corresponding to each detector, and the positioning piece is arranged in the positioning hole.

In the above possible implementation manner, the positioning piece and the positioning hole cooperate to position the detector on the mounting frame, so that the detector is prevented from moving when being clamped by the buckle, thereby being beneficial to accurate installation of the detector, and further being beneficial to accurate cooperation of the detector and the abutting end of the paper blocking board extending out of the side wall, so as to improve the accuracy of detection.

A second aspect of the embodiments of the present application provides an image forming apparatus including an image forming apparatus main body and a paper feed cassette as described above. The paper feed cassette is detachably provided to the image forming apparatus main body.

The above-mentioned image forming apparatus of this application, its paper feed box passes through the paper blocking board stretches out the box body the butt end is direct with a plurality of in the size detection device the detector switch cooperation is in order to realize being located the detection of the size of the paper in the holding chamber, its simple structure is favorable to reducing the space that is used for detecting the part occupation of paper size to be favorable to image forming apparatus's miniaturization, simultaneously, still be favorable to reducing the installation error that arouses because of detecting part structure is complicated, thereby be favorable to the control of detection precision. In addition, the tip of detector switch is equipped with rotatable gyro wheel and through the gyro wheel with the butt end cooperates in order to open or close the detector switch is favorable to guaranteeing the detector switch with smooth access between the butt end reduces the condition of blocking between the two, thereby is favorable to the normal operating of image forming equipment.

Based on the first aspect, in one possible implementation manner, the number of the paper feeding boxes is a plurality.

Drawings

Fig. 1 is a schematic configuration diagram of an image forming apparatus according to an embodiment of the present application.

Fig. 2 is a schematic structural view of a paper feed cassette according to an embodiment of the present application.

Fig. 3 is a schematic partial structure of the paper feeding cassette according to an embodiment of the present application.

Fig. 4 is a schematic partial structure of the paper feeding cassette according to an embodiment of the present application.

Fig. 5 is a schematic structural view of a mounting frame according to an embodiment of the present application.

Fig. 6 is a sectional view of the paper feed cassette of one embodiment of the present application along the second direction.

Fig. 7 is a partial cross-sectional use state view of the paper feed cassette according to an embodiment of the present application.

Fig. 8 is a partial cross-sectional use state view of the paper feed cassette according to an embodiment of the present application.

Fig. 9 is a partial cross-sectional use state view of the paper feed cassette of one embodiment of the present application.

Fig. 10 is a partial sectional use state view of the paper feed cassette of the embodiment of the present application.

Fig. 11 is a partial cross-sectional use state view of the paper feed cassette according to an embodiment of the present application.

Fig. 12 is a partial cross-sectional use state view of the paper feed cassette according to the embodiment of the present application.

Fig. 13 is a schematic exploded view of a case according to an embodiment of the present application.

Description of the main reference signs

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Detailed Description

Further advantages and effects of the present application will be readily apparent to those skilled in the art from the present disclosure, by describing embodiments of the present application with specific examples. While the description of the present application will be presented in conjunction with the preferred embodiments, it is not intended that the features of this application be limited to only this implementation. Rather, the purpose of the description presented in connection with the embodiments is to cover other alternatives or modifications, which may be extended by the claims based on the present application. The following description contains many specific details in order to provide a thorough understanding of the present application. The present application may be practiced without these specific details. Furthermore, some specific details are omitted from the description in order to avoid obscuring the focus of the application. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.

Hereinafter, the terms "first," "second," and the like, if used, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more. The terms of orientation such as "upper", "lower", "left", "right", etc. are defined with respect to the orientation of the components shown in the drawings as they are schematically disposed, and it should be understood that these directional terms are relative terms that are used for descriptive and clarity with respect to each other and that may be varied accordingly with respect to the orientation of the components shown in the drawings.

In the present application, the term "coupled" should be interpreted broadly, unless explicitly stated or defined otherwise, as such, as the term "coupled" may be fixedly coupled, detachably coupled, or as a single piece; can be directly connected or indirectly connected through an intermediate medium. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

In the following detailed description of the embodiments in conjunction with the drawings, which are not to scale in general, the drawings illustrating the partial structure of the device are not to scale and are merely examples, which should not limit the scope of the present application.

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

Fig. 1 shows an image forming apparatus 200 of an embodiment of the present application. The image forming apparatus 200 may be, but is not limited to, a copier, a printer, a facsimile machine, a compound machine, etc. As shown in fig. 1, the image forming apparatus 200 is a printer. The image forming apparatus 200 includes an image forming apparatus main body 201 and a paper feed cassette 100. The paper feed cassette 100 is detachably attached to the image forming apparatus main body 201, and is configured to store paper and convey paper to the image forming apparatus main body 201. The image forming apparatus main body 201 forms an image on the sheet conveyed from the sheet feeding cassette 100. In the image forming apparatus 200, the number of the paper feed cassettes 100 may be selected as required, for example, one as shown in fig. 1, or a plurality thereof may be included in other embodiments.

Fig. 2 shows a schematic configuration of the paper feed cassette 100 according to an embodiment of the present application. The paper feed cassette 100 includes a cassette body 10, a size detecting device 30, and a paper blocking plate 50.

The box body 10 includes a bottom wall 11 and a side wall 13, and the bottom wall 11 and the side wall 13 enclose to form a containing cavity 15. The accommodating chamber 15 is used for storing paper.

In this embodiment, the case 10 may have a substantially rectangular parallelepiped shape. The bottom wall 11 may have a substantially rectangular plate shape, and the side wall 13 may protrude toward one side of the bottom wall 11 along the periphery of the bottom wall 11. The side wall 13 includes a first wall 131, a second wall 132, a third wall 133 and a fourth wall 134 connected in series, and the fourth wall 134 is further connected to the first wall 131. The first wall 131 and the third wall 133 may be disposed in parallel, and the second wall 132 and the fourth wall 134 may be disposed in parallel.

As shown in fig. 2 and 3, the dimension detecting device 30 is located on a side of the first wall 131 facing away from the accommodating chamber 15. The size detection device 30 includes a plurality of detectors 31 arranged at intervals along the first direction X.

Referring to fig. 4 in combination, each detector 31 includes a detector main body 312 and a detector switch 314, wherein one end of the detector switch 314 is connected to the detector main body 312, and the other end is located on a side of the detector main body 312 close to the first wall 131. In this embodiment, the detector switch 314 is a resilient arm, the end of which remote from the detector body 312 is retractable as compared to the detector body 312. When the end of the detector switch 314 away from the detector body 312 is pressed, the end of the detector switch 314 away from the detector body 312 approaches the detector body 312. When the end of the detector switch 314 remote from the detector body 312 is released, the end of the detector switch 314 remote from the detector body 312 returns to its original position.

The end of the detector switch 314 remote from the detector body 312 is also rotatably provided with a roller 316.

The distance between any adjacent two of the detectors 31 in the first direction X may be the same or different. Further, in the first direction X, the distance between the centers of any two adjacent rollers 316 may be the same or different. The design can be specifically adjusted according to the actual detection requirement.

As shown in fig. 4, the size detecting device 30 may further include a mounting frame 33, and a plurality of the detectors 31 are mounted on the mounting frame 33. Specifically, in some embodiments, the mounting frame 33 may be provided with a buckle 331 corresponding to each of the detectors 31, and the buckle 331 is configured to hold the detector 31 for fixing the detector 31. As shown in fig. 4 and fig. 5, each of the opposite sides of the detector 31 in the first direction is provided with a buckle 331 respectively and is clamped with the buckle 331, so that stability of the detector 31 is maintained when the detector 31 is subjected to a force along the first direction (for example, when the roller 316 is subsequently contacted with the paper blocking plate 50 in a back-and-forth abutting manner), possibility of loosening the detector 31 in the first direction is reduced, and further probability of displacement of the detector 31 is reduced, thereby ensuring detection accuracy.

In some embodiments, the buckle 331 may further be disposed at other positions of the detector 31, for example, may further be disposed at a side of the detector main body 312 away from the case 10, so as to further improve stability of the detector 31, thereby being beneficial to further ensuring accuracy of detection.

The mounting frame 33 may further be provided with a positioning member 333 corresponding to each of the detector bodies 312, and correspondingly, each of the detector bodies 312 may be provided with a positioning hole 313. The locating piece 333 is disposed in the locating hole 313 so as to cooperate to locate the detector 31 on the mounting frame 33, so as to prevent the detector 31 from moving when the detector 31 is clamped by the buckle 331, thereby being beneficial to the accurate mounting of the detector 31 on the mounting frame 33, and further being beneficial to the accurate cooperation of the detector 31 and the paper blocking plate 50 so as to improve the detection accuracy. The number of the positioning members 333 corresponding to each of the detector bodies 312 may be selected according to needs, as shown in fig. 4, two positioning holes 313 may be provided on each of the detector bodies 312, and correspondingly, two positioning members 333 are provided on the mounting frame 33 corresponding to each of the detectors 31.

Referring to fig. 2 and 4, the size detecting device 30 may further include a housing 35, where the housing 35 may be located at a side of the first wall 131 facing away from the accommodating cavity 15, and disposed side by side with the box 10. The mounting 33 is fixed to the housing 35.

In some embodiments, the housing 35 may also be omitted. The mounting frame 33 may be directly mounted on a side of the first wall 131 facing away from the accommodating cavity 15. In some embodiments, the mounting 33 may be omitted. The plurality of detectors 31 may be directly mounted on a side of the first wall 131 facing away from the accommodating cavity 15.

Referring to fig. 2, the paper blocking plate 50 is slidably disposed on the bottom wall 11 along the first direction X. Specifically, in some embodiments, referring to fig. 3 and 6, the bottom wall 11 is provided with a sliding rail 110 extending along the first direction X, and the mounting end 51 of the paper blocking plate 50 is mounted on the sliding rail 110 and can slide along the first direction X on the sliding rail 110. In some embodiments, the sliding rail 110 may be a sliding groove formed on the bottom wall 11.

The paper blocking plate 50 also protrudes from the side wall 13 in the direction of the dimension detecting device 30. Specifically, referring to fig. 3, the first wall 131 is provided with a through slot 130, and the paper blocking plate 50 passes through the through slot 130, so that the abutting end 55 of the paper blocking plate 50 is located at a side of the first wall 131 facing away from the accommodating cavity 15. In some embodiments, the first wall 131 may be disposed along the first direction X, and the through slot 130 may be opened along the first direction X. As shown in fig. 7 to 12, during the sliding of the paper blocking plate 50 along the first direction X, the abutting end 55 of the paper blocking plate 50 is in an abutting state or a non-abutting state with the roller 316 in the size detecting device 30. Different states between the roller 316 and the abutting end 55 of the paper blocking plate 50 disposed on each of the detector switches 314 can reflect the size of the paper to be detected, for example, the states of fig. 7 to 12 respectively correspond to the states of different sizes of paper detection. The abutting end 55 of the paper blocking plate 50 is directly matched with the rollers 316 on the detector switches 314 of the detectors 31 in the size detecting device 30 to detect the size of the paper in the accommodating cavity 15, so that the size detecting device is simple in structure, beneficial to reducing the space occupied by the components for detecting the size of the paper, and beneficial to reducing the installation error caused by the complex structure of the detecting components, thereby facilitating the control of the detecting precision. The roller 316 cooperates with the abutting end 55 of the paper blocking plate 50 to turn on or off the detector switch 314, which is beneficial to ensuring smooth connection between the detector switch 314 and the abutting end 55 and reducing jamming therebetween.

In this application, as shown in fig. 2, a direction in which the paper blocking plate 50 protrudes toward the direction in which the size detecting device 30 is located is defined as a second direction Y. In some embodiments, the second direction Y may be perpendicular to the first direction X, which is favorable for reducing the space occupied by the paper blocking board 50, and also favorable for abutting the whole part of the paper blocking board 50 located in the box body 10 with the edge of the paper located in the accommodating cavity 15, so as to be favorable for detecting the size of the paper more accurately.

Referring to fig. 7 to 12, the abutting end 55 of the paper blocking plate 50 includes an abutting area 56 protruding away from the first wall 131 for abutting the roller 316. The abutting region 56 includes a first inclined portion 561, an abutting portion 563, and a second inclined portion 565, where the first inclined portion 561 and the second inclined portion 565 are respectively located at two ends of the abutting portion 563 opposite to each other in the first direction X, so that the roller 316 can be guided during the sliding process of the paper blocking plate 50 along the first direction X, thereby facilitating the roller 316 to smoothly slide away from the abutting portion 563 or smoothly slide away from the abutting portion 563, and further facilitating the reduction of the jamming situation when the paper feeding box is used.

The contact portion 563 may be a contact surface, or may be linear or dot-shaped.

When the abutment portion 563 is an abutment surface, the connection between the first inclined portion 561 and the abutment portion 563 may be rounded, so that the roller 316 may smoothly slide from the first inclined portion 561 to the abutment portion 563 or smoothly slide from the abutment portion 563 along the first inclined portion 561, thereby reducing the jamming of the paper feeding cassette 100 during use.

The connection between the second inclined portion 565 and the abutment portion 563 may be rounded, so that the roller 316 may smoothly slide from the second inclined portion 565 to the abutment portion 563 or smoothly slide from the abutment portion 563 along the second inclined portion 565, thereby reducing the jamming of the paper feeding cassette 100 during use.

The number of abutment regions 56 may be designed as desired. When the abutment end 55 includes more than one abutment region 56 (i.e., a plurality of abutment regions 56), a plurality of abutment regions 56 are disposed along the first direction X, and any adjacent two abutment regions 56 are spaced apart from each other. I.e. a recessed area (not shown) is provided between any two adjacent abutment areas 56. As shown in fig. 3 and 7-12, the abutment end 55 may include two abutment regions 56, the two abutment regions 56 being separated by a recess 57.

As shown in fig. 7 to 12, the plurality of abutting areas 56 are disposed, so that the paper size can be detected by abutting the different abutting areas 56 against the rollers 316 on the different detector switches 314 during the sliding process of the paper blocking plate 50 along the first direction X.

When the number of the abutment regions 56 is plural, the shortest distance between any adjacent two of the abutment regions 56 may be the same or different in the first direction X, and the longest distance between any adjacent two of the abutment regions 56 may be the same or different.

As shown in fig. 10, in some embodiments, a plurality of the detectors 31 includes a first detector 31a and a second detector 31b, and in the first direction, a distance between a center of the roller 316 on the first detector 31a and a center of the roller 316 on the second detector 31b is D1. The plurality of contact regions 56 includes first contact regions 56a and second contact regions 56b spaced apart from each other, and in the first direction, a shortest distance between the contact portions 563 of the first contact regions 56a and the contact portions 563 of the second contact regions 56b is D2, and a longest distance between the contact portions of the first contact regions and the contact portions of the second contact regions is D3. Wherein the sheet feeding cassette 100 may further satisfy the following conditions: d2 is more than or equal to d1 and less than or equal to D3. At this time, as shown in fig. 10, the first abutting area 56a and the second abutting area 56b are simultaneously abutted with the roller 316 on the first detector 31a and the roller 316 on the second detector 31b during the sliding of the paper blocking plate 50 along the first direction X, so that the detection of the size of the paper is realized by the abutment of the rollers 316 on the different numbers of the detector switches 314, which is advantageous for the detection of the size of the paper by setting a smaller number of lights. In some embodiments, the number of abutment regions and the number of detectors satisfying the requirement of d2.ltoreq.d1.ltoreq.d3 described above are not limited to the above, but may be increased as required.

In some embodiments, as shown in fig. 13, the case 10 may be formed by inserting the first portion 10a and the second portion 10b along a direction. The first portion 10a includes a first bottom 11a and a first side 13a, and the second portion 10b includes a second bottom 11b and a second side 13b. The first bottom 11a and the second bottom 11b are inserted into each other in the first direction X to form the bottom wall 11, and the first side 13a and the second side 13b are inserted into each other in the first direction X to form the side wall 13. Wherein the paper blocking plate 50 slides on the first bottom 11a and the second bottom 11b along the first direction X. The first portion 10a and the second portion 10b may be adjusted to match with each other along the first direction X, so as to adjust the size of the accommodating cavity 15, so that the paper feeding cassette 100 can accommodate more paper sheets with different sizes.

It should be noted that the above is only a specific embodiment of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes or substitutions should be covered in the scope of the present application; in the case of no conflict, the embodiments of the present application and features of the embodiments may be combined with one another. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A paper feed cassette, comprising:

the box body comprises a bottom wall and a side wall, wherein the bottom wall and the side wall are surrounded to form a containing cavity;

the size detection device is positioned on one side of the side wall, which is away from the accommodating cavity, and comprises a plurality of detectors which are arranged at intervals along a first direction;

the paper blocking plate is slidably arranged on the bottom wall along the first direction and extends out of the side wall towards the direction in which the size detection device is located;

each detector comprises a detector main body and a detector switch, wherein the detector switch is connected with the detector main body, the end part of the detector switch, which is far away from the detector main body, is telescopic compared with the detector main body, and a roller is rotatably arranged at the end part of the detector switch, which is far away from the detector main body;

the abutting end of the paper blocking plate extending out of the side wall is in an abutting state or a non-abutting state with the roller in the size detection device in the sliding process of the paper blocking plate along the first direction.

2. A sheet feeding cassette as claimed in claim 1, wherein a direction in which said sheet stopper protrudes toward a direction in which said size detecting means is located is defined as a second direction, said first direction being perpendicular to said second direction.

3. A sheet feeding cassette according to claim 1, wherein said abutting end includes an abutting region protruding toward away from said cassette body, said abutting region for abutting said roller; the abutting region comprises a first inclined portion, an abutting portion and a second inclined portion, and the first inclined portion and the second inclined portion are respectively located at two ends of the abutting portion opposite to each other in the first direction.

4. A sheet feeding cassette according to claim 3, wherein a junction of the first inclined portion and the abutting portion is a rounded corner, and a junction of the second inclined portion and the abutting portion is a rounded corner.

5. A sheet feeding cassette according to claim 3, wherein the number of said abutment regions is plural, and any adjacent two of said abutment regions are disposed at intervals in said first direction.

6. The paper feed cassette of claim 5, wherein a plurality of said abutment regions includes first and second spaced abutment regions, a plurality of said detectors includes first and second detectors, a distance between a center of said roller on said first detector and a center of said roller on said second detector in said first direction is D1, a shortest distance between said abutment portion of said first abutment region and said abutment portion of said second abutment region is D2, and a longest distance between said abutment portion of said first abutment region and said abutment portion of said second abutment region is D3, wherein D2 is D1.

7. The paper feed cassette of claim 1, wherein the size detection device further comprises a mounting bracket, the mounting bracket is located at a side of the side wall facing away from the accommodating chamber, the detectors are disposed on the mounting bracket, and the mounting bracket is provided with two buckles corresponding to each of the detectors, and the two buckles are clamped with two opposite sides of the detector in the first direction.

8. The paper feed cassette of claim 7, wherein said detector body of each of said detectors is provided with a positioning hole, and said mounting bracket is further provided with a positioning member corresponding to each of said detectors, said positioning member being provided in said positioning hole.

9. An image forming apparatus comprising an image forming apparatus main body and the sheet feeding cassette according to any one of claims 1 to 8, the sheet feeding cassette being detachably provided to the image forming apparatus main body.

10. The image forming apparatus according to claim 9, wherein the number of the paper feed cassettes is plural.

Images