JP2015187040A - Sheet feeding device and image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet feeding device that can surely regulate horizontal movement of a feeding cassette without deteriorating operability of the feeding cassette and to provide an image forming device.SOLUTION: The sheet feeding device comprises a device main body, a feeding cassette and positioning means that is configured to position the feeding cassette by engagement of a positioning protrusion to a positioning hole. In a zone from a position from which the feeding cassette is pulled out to an engagement start position at which engagement of the positioning means is started, inner spacers 47 and 48 and outer spacers 57 and 58 contact outer rails 53 and 54 and inner rails 43 and 44 respectively so as to regulate movement in a horizontal direction orthogonal to a sliding direction of the feeding cassette, and in a zone from the engagement start position to a position to which a sheet is fed, contact of the inner spacers 47 and 48 and the outer spacers 57 and 58 with the outer rails 53 and 54 and the inner rails 43 and 44 is released by first hole parts 61a and 61b and second hole parts 60a and 60b respectively.

Description

  The present invention relates to a sheet feeding apparatus and an image forming apparatus, and more particularly to a sheet feeding apparatus having a feeding cassette for stacking sheets and an image forming apparatus including the sheet feeding apparatus.

  2. Description of the Related Art Conventionally, image forming apparatuses such as copiers and printers are configured to include a sheet feeding unit that feeds sheets to an image forming unit, and the sheet feeding unit stores sheets of various sizes. A plurality of feeding cassettes.

  The plurality of feeding cassettes are provided with a guided member that is slidable on a guide member provided on the apparatus main body. By providing a sliding member on the guided member, the sliding movement to the apparatus main body is made smooth. The detachability operability of the feeding cassette is improved (see Patent Document 1).

  Here, FIG. 14 shows a state in which the feeding cassette according to Patent Document 1 is attached to the feeding apparatus body. If the feeding cassette 100 rotates in the direction of the arrow Y in the middle of attachment / detachment, the feeding cassette 100 may come into contact with the surrounding exterior cover or structural member, and the feeding cassette 100 may be damaged. Therefore, as shown in FIG. 14, the sheet feeding device described in Patent Document 1 is configured in the direction indicated by the arrow Y in the middle of attachment / detachment of the feeding cassette 100 by the side rollers 102 disposed at both horizontal ends of the inner rail 101. The rotation is limited within a certain angle. In addition, positioning rollers 112 are disposed at both ends of the outer rail 111 in the horizontal direction inside the apparatus main body 110, and the feeding cassette 100 is positioned inside the apparatus main body 110 by the positioning rollers 112.

Japanese Patent Laid-Open No. 2008-50081

  However, in view of the variation in the position of the positioning roller 112 provided in the apparatus main body 110, when the gap between the side roller 102 and the outer rail 111 becomes small, it becomes a sliding resistance when positioning the feeding cassette 100. In particular, in a large-capacity feeding cassette, since the size of the structural member is large, the sliding resistance is also increased. And when sliding resistance becomes large, the operation force required at the time of feeding cassette insertion / extraction will become large, and there existed a possibility that operativity might fall.

  SUMMARY An advantage of some aspects of the invention is that it provides a sheet feeding device that can reliably regulate the horizontal movement of the feeding cassette without deteriorating the operability of the feeding cassette, and an image forming apparatus including the sheet feeding device. To do.

  The present invention provides an apparatus main body, a sheet feeding position for stacking sheets and feeding sheets, and a feeding cassette slidable between a drawing position pulled out from the apparatus main body, the apparatus main body, and the A fitting projection provided on one side of the feeding cassette and a fitting hole provided on the other side of the apparatus main body and the feeding cassette, and when the feeding cassette slides to the sheet feeding position, Positioning means for positioning the position of the feeding cassette by fitting the fitting protrusion into the fitting hole, an outer rail provided in the apparatus main body, an inner rail provided in the feeding cassette, and the inner An inner spacer provided on the rail and capable of contacting the outer rail from the horizontal direction, and provided on the outer rail and capable of contacting the inner rail from the horizontal direction. An outer spacer, a first release portion that is formed on the inner rail in the mounting direction of the feeding cassette and releases the contact between the inner spacer and the outer rail, and a mounting direction of the feeding cassette on the inner rail And a second release portion that releases contact between the outer spacer and the inner rail, and when the feeding cassette slides, the positioning means is fitted from the drawer position. The inner spacer and the outer spacer are in contact with the outer rail and the inner rail, respectively, until the mating start position where the mating is started, and the horizontal movement perpendicular to the sliding direction of the feeding cassette is restricted, and From the fitting start position to the sheet feeding position, the first release section and the second release section are used to Spacers and the outer spacer contact with the respective said outer rail and the inner rail is released, characterized in that.

  According to the present invention, when the feeding cassette is positioned at the sheet feeding position, the horizontal restriction of the feeding cassette is released without degrading the horizontal regulation of the feeding cassette. Directional movement can be reliably controlled.

1 is a perspective view schematically showing an image forming apparatus according to an embodiment of the present invention. It is sectional drawing which shows typically the sheet feeding apparatus which concerns on this embodiment. It is a perspective view which shows the state which pulled out the feeding cassette from the apparatus main body which concerns on this embodiment. (A) is the perspective view which looked at the feeding cassette concerning a 1st embodiment from the upper part, and (b) is the perspective view which looked at the feeding cassette from the lower part. It is a perspective view which shows typically a part of internal structure of the apparatus main body which concerns on 1st Embodiment. (A) is AA arrow sectional drawing shown in FIG. 3 of the state which pulled out the supply cassette which concerns on 1st Embodiment from the apparatus main body, (b) is BB arrow view shown in FIG. It is sectional drawing. (A) is AA arrow sectional drawing shown in FIG. 3 in the state just before the feeding cassette which concerns on 1st Embodiment is fixed to an apparatus main body with a positioning pin, (b) is FIG. It is a BB arrow sectional view shown. (A) is AA arrow sectional drawing shown in FIG. 3 of the state with which the feeding cassette which concerns on 1st Embodiment was fixed to the apparatus main body by the positioning pin, (b) is B shown in FIG. It is -B arrow sectional drawing. (A) is the perspective view which looked at the feeding cassette which concerns on 2nd Embodiment from upper direction, (b) is the perspective view which looked at the feeding cassette from the downward direction. It is a perspective view which shows typically a part of internal structure of the apparatus main body which concerns on 2nd Embodiment. (A) is AA arrow sectional drawing shown in FIG. 3 of the state which pulled out the feed cassette which concerns on 2nd Embodiment from the apparatus main body, (b) is BB arrow view shown in FIG. It is sectional drawing. (A) is AA arrow sectional drawing shown in FIG. 3 in the state just before the feeding cassette which concerns on 2nd Embodiment is fixed to an apparatus main body with a positioning pin, (b) is FIG. It is a BB arrow sectional view shown. (A) is AA arrow sectional drawing shown in FIG. 3 of the state with which the supply cassette which concerns on 2nd Embodiment was fixed to the apparatus main body by the positioning pin, (b) is B shown in FIG. It is -B arrow sectional drawing. It is a figure which shows the state which mounts the feeding cassette which concerns on a prior art example to a feeding apparatus main body.

  Hereinafter, an image forming apparatus according to an embodiment of the present invention will be described with reference to the drawings. An image forming apparatus according to an embodiment of the present invention is an image forming apparatus provided with a sheet feeding device capable of mounting a plurality of feeding cassettes on the main body of the image forming device, such as a copying machine, a printer, a facsimile, and a composite device thereof. . In the following embodiments, an image forming apparatus including a sheet feeding device having two sheet feeding units, a right feeding unit and a left feeding unit, will be described.

<First Embodiment>
An image forming apparatus 1 according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 8B. First, the overall configuration of the image forming apparatus 1 according to the first embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view schematically showing an image forming apparatus 1 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view schematically showing the sheet feeding apparatus 3 according to the present embodiment.

  As shown in FIG. 1, the image forming apparatus 1 includes an image forming apparatus main body 2 that forms an image on a sheet S, and a sheet feeding apparatus 3 that feeds the sheet S to the image forming apparatus main body 2. The image forming apparatus main body 2 includes a sheet feeding unit 21 that feeds the sheet S, an image forming unit 22 that forms an image on the sheet S, and a first opening / closing door 23 that is supported by the image forming apparatus main body 2 so as to be freely opened and closed. And. The sheet feeding unit 21 includes a first storage unit 24 and a second storage unit 25 that are arranged in two stages on the top and bottom, and selectively selects the sheets stored in the first storage unit 24 and the second storage unit 25. To the image forming unit 22. The image forming unit 22 forms an image on the sheet S fed from the sheet feeding unit 21. Here, a description of a specific configuration of the image forming unit 22 is omitted. The first opening / closing door 23 is configured so that when the sheet S passing through the sheet conveying path 26 connecting the sheet feeding unit 21 and the image forming unit 22 causes a jam or the like, it can be easily jammed. The sheet conveyance path 26 is formed so as to be freely opened.

  The sheet feeding device 3 is connected to a sheet conveyance path 26 of the image forming apparatus main body 2, and sheets S stored in a right side feeding cassette 32 and a left side feeding cassette 33 described later are passed through the sheet conveyance path 26. To the image forming unit 22 of the image forming apparatus main body 2. As illustrated in FIG. 2, the sheet feeding device 3 includes a feeding device main body 31, a right feeding cassette 32 and a left feeding cassette 33 on which sheets S are stacked, and a second opening / closing door 34. . The sheet feeding device 3 also includes a right feeding unit 35 and a left feeding unit 36 that feed sheets one by one on the right feeding cassette 32 and the left feeding cassette 33, and a left feeding unit 36. A horizontal sheet feeding unit 37 that conveys the sheet fed from the sheet and a conveyance guide 38 are provided.

  The feeding device main body 31 is formed so that a substantially box-shaped right feeding cassette 32 and a left feeding cassette 33 are detachable, and the user pulls out the right feeding cassette 32 and the left feeding cassette 33 to pull out the sheet. Replace or add. The second opening / closing door 34 is formed so as to be able to open the joining portion of the right feeding unit 35 and the lateral sheet feeding unit 37, and for example, performs jam processing of the right feeding unit 35 and the lateral sheet feeding unit 37. Used when. The right feeding unit 35 is provided in the upper right part of the right feeding cassette 32 and feeds the sheets stacked on the right feeding cassette 32 one by one to the sheet conveyance path 26 of the image forming apparatus main body 2. The left feeding unit 36 is provided in the upper right part of the left feeding cassette 33 and feeds the sheets stacked on the left feeding cassette 33 to the lateral sheet feeding unit 37 one by one. The lateral sheet feeding unit 37 is provided above the right feeding cassette 32 and feeds the sheet conveyed by the left feeding unit 36 to the sheet conveying path 26 of the image forming apparatus main body 2. The conveyance guide 38 is disposed on the side of the lateral sheet feeding unit 37 and above the right feeding unit 35, and is arranged between a guide position and an open position around a rotation shaft (not shown) extending in the horizontal direction. The feed device main body 31 is rotatably supported. The conveyance guide 38 guides the sheet S fed to the sheet conveyance path 26 by the right feeding unit 35 and the lateral sheet feeding unit 37.

  Here, the feeding device main body 31, the right feeding cassette 32, and the left feeding cassette 33 will be described more specifically with reference to FIGS. 3 to 8B. First, each whole structure is demonstrated, referring FIGS. 3-5. Since the right feeding cassette 32 and the left feeding cassette 33 have the same basic configuration, the right feeding cassette 32 and the left feeding cassette 33 will be described as the feeding cassette 4 below. Further, the feeding apparatus main body 31 will be described as the apparatus main body 5 to which the feeding cassette 4 can be attached and detached.

  FIG. 3 is a perspective view showing a state in which the feeding cassette 4 is pulled out from the apparatus main body 5 according to the present embodiment. FIG. 4A is a perspective view of the feeding cassette 4 according to the first embodiment as viewed from above. FIG. 4B is a perspective view of the feeding cassette 4 viewed from the rear. FIG. 5 is a perspective view schematically showing a part of the internal structure of the apparatus main body 5 according to the first embodiment.

  As shown in FIG. 3, the feeding cassette 4 is formed to be slidable with respect to the apparatus main body 5 in the arrow X direction shown in FIG. 3 (hereinafter referred to as “sliding direction X”). Specifically, the feeding cassette 4 can be slid between a sheet feeding position for feeding the sheet S inside the apparatus main body 5 and a drawing position pulled out from the apparatus main body 5. Is formed.

  As shown in FIGS. 4A and 4B, the feeding cassette 4 includes a cassette body 40 that accommodates the sheet S, a first positioning pin 41 and a second positioning pin as fitting protrusions of positioning means. 42 and inner rails 43 and 44 as guided members of the regulating means. Further, the feeding cassette 4 includes inner bearings 45 and 46 and inner spacers 47 and 48 as guided members of the restricting means.

  As shown in FIG. 4A, the cassette body 40 is formed in a rectangular box shape having an open upper surface, and is formed so that sheets S can be stacked therein. The first positioning pin 41 is provided on the front X1 side in the sliding direction X of the cassette body 40, and the second positioning pin 42 is provided on the back X2 side in the sliding direction X of the cassette body 40. In the first embodiment, the positioning pins are provided on the front and back (front and back) of the cassette body 40 in the slide direction X, respectively.

  As shown in FIG. 4B, the inner rails 43 and 44 are extended in the sliding direction X on the bottom surface of the cassette body 40 and slidably engage with outer rails 53 and 54 described later. Further, the inner rail 43 is formed with first holes 61a and 61b on the front X1 side in the sliding direction X as release portions of the restricting means (see FIG. 8B described later). The first holes 61a and 61b are arranged from the position where the first positioning pin 41 and the second positioning pin 42 start to fit into the first positioning hole 51 and the second positioning hole 52 (fitting start position) to the fitting position. Is formed at a position facing outer spacers 57 and 58 described later. That is, the outer spacers 57 and 58 are not guided (restricted) by the inner rail 43 from the fitting start position to the fitting position. Slopes 43a and 43b are formed on the back X2 side in the sliding direction X of the first holes 61a and 61b. The slopes 43a and 43b are formed so as to expand toward the front X1 side in the slide direction X. When the feeding cassette 4 is pulled out, the outer spacers 57 and 58 are hooked on the inner rails 43 and 44, and the cassette body 40 is engaged. It is provided to prevent it from stopping.

  The inner bearings 45 and 46 are rotatably supported on the back X2 side in the sliding direction X of the inner rails 43 and 44 with a horizontal direction orthogonal to the sliding direction X as a rotation axis. The inner bearings 45 and 46 rotate on the outer rails 53 and 54 to assist the movement of the inner rails 43 and 44 in the slide direction X. Inner spacers 47 and 48 are attached to the inner rails 43 and 44 on the back X2 side in the sliding direction X, and come into contact with an outer rail 53 to be described later to guide the cassette body 40 in the sliding direction X. Suppress backlash. That is, the inner spacers 47 and 48 are in contact with the outer rail 53 and restrict the horizontal movement perpendicular to the slide direction X of the cassette body 40 (feed cassette 4).

  As shown in FIG. 5, the apparatus main body 5 includes a housing 50 that accommodates the feeding cassette 4, first positioning holes 51 and second positioning holes 52 as fitting holes for positioning means, and guide members for regulating means. And outer rails 53 and 54. The apparatus main body 5 includes outer bearings 55 and 56 and outer spacers 57 and 58 as guide members for restricting means.

  The housing 50 is formed in a rectangular box shape with the front X1 side opened in the sliding direction X, and a first positioning hole 51 and a second positioning hole 52 are provided on the upper surface inside the housing 50. The first positioning hole 51 is provided on the front X1 side in the sliding direction X of the housing 50, and is formed so as to be fitted to the first positioning pin 41. The second positioning hole 52 is provided on the inner side X <b> 2 in the sliding direction X of the housing 50, and is formed so as to be fitted to the second positioning pin 42. In the first embodiment, the first positioning pin 41 is fitted into the first positioning hole 51, and the second positioning pin 42 is fitted into the second positioning hole 52, so that the feeding cassette 4 is attached to the apparatus main body 5. Positioned at the sheet feeding position. This fitting position becomes the sheet feeding position.

  The outer rails 53 and 54 are extended on the lower surface of the housing 50 in the sliding direction X, and guide the cassette body 40 (feed cassette 4) engaged with the inner rails 43 and 44 to the sheet feeding position. The outer rail 53 is formed with second holes 60a and 60b as release portions on the back X2 side in the sliding direction X (see FIG. 8B described later). The second holes 60a and 60b are located between the fitting start position and the fitting position where the first positioning pin 41 and the second positioning pin 42 start fitting into the first positioning hole 51 and the second positioning hole 52. The inner spacers 47 and 48 are formed at positions facing each other. That is, the inner spacers 47 and 48 are not guided (restricted) by the outer rails 53 and 54 from the fitting start position to the fitting position. Slopes 53a and 53b are formed on the front X1 side in the sliding direction X of the second holes 60a and 60b. The slopes 53a and 53b are formed so as to spread toward the back X2 side in the slide direction X. When the feeding cassette 4 is pulled out, the inner spacers 47 and 48 are hooked on the outer rails 53 and 54, and the cassette body 40 is locked. It is provided to prevent this.

  The outer bearings 55 and 56 are rotatably supported on the front X1 side in the sliding direction X of the outer rails 53 and 54 with a horizontal direction orthogonal to the sliding direction X as a rotation axis. The outer bearings 55 and 56 roll when the inner rails 43 and 44 are engaged, and assist the movement of the inner rails 43 and 44 in the sliding direction X. The outer spacers 57 and 58 are attached to the front X1 side in the sliding direction X of the outer rails 53 and 54, and come into contact with the inner rails 43 and 44 to guide the cassette body 40 in the sliding direction X. Suppress backlash. That is, the outer spacers 57 and 58 are in contact with the inner rails 43 and 44 and restrict the horizontal movement perpendicular to the slide direction X of the cassette body 40 (feed cassette 4).

  Next, the gap between the inner spacers 47, 48 and the outer rail 53 and the gap between the outer spacers 57, 58 and the inner rail 43 will be described with reference to FIGS. 6 (a) to 8 (b). FIG. 6A is a cross-sectional view taken along line AA shown in FIG. 3 in a state where the feeding cassette 4 according to the first embodiment is pulled out from the apparatus main body 5. FIG. 6B is a cross-sectional view taken along the line BB shown in FIG. FIG. 7A is a cross-sectional view taken along the line AA shown in FIG. 3 in a state immediately before the feeding cassette 4 according to the first embodiment is fixed to the apparatus main body 5 by the positioning pins. FIG.7 (b) is BB arrow sectional drawing shown in FIG. FIG. 8A is a cross-sectional view taken along the line AA shown in FIG. 3 in a state where the feeding cassette 4 according to the first embodiment is fixed to the apparatus main body by a positioning pin. FIG. 8B is a cross-sectional view taken along arrow BB shown in FIG.

As shown in FIG. 6A, the feeding cassette 4 is in the drawer position (the first positioning pin 41 and the second positioning pin 42 are in a position away from the first positioning hole 51 and the second positioning hole 52). ) Is in the state shown in FIG. Specifically, the gap between the inner rail 43 and the outer spacer 57 is G _1, the gap between the inner rail 43 and the outer spacer 58 is G _2. Further, the gap between the outer rail 53 and the inner spacer 47 is _{G 3,} the gap between the outer rail 53 and the inner spacer 48 is _{G 4.} Those in the first embodiment, the gap _{G 1,} G _2, G 3, less configuration the number of parts constituting the _{G 4,} the gap _{G 1,} G _2, G 3, variation in the dimension of _{G 4} are relatively small become. Therefore, the gaps G ₁ , G ₂ , G ₃ , G ₄ can be set to small values. As a result, the movement of the cassette body 40 (feed cassette 4) in the horizontal direction perpendicular to the slide direction X can be reliably restricted, and the horizontal direction (see FIG. 14) perpendicular to the slide direction X during the mounting of the feed cassette 4 The amount of rotation in the direction indicated by arrow Y) can be reduced. As a result, it is possible to reliably prevent rattling when the cassette body 40 is attached or detached. Moreover, a sense of quality is improved by preventing rattling.

  Next, as shown in FIG. 7A, when the first positioning pin 41 and the second positioning pin 42 start fitting with the first positioning hole 51 and the second positioning hole 52 (fitting start position). The gap is in the state shown in FIG. Specifically, at the fitting start position, the first rails 61 a and 61 b are formed in the inner rails 43 and 44, and the second holes 60 a and 60 b are formed in the outer rails 53 and 54. That is, the inner spacers 47 and 48 are not regulated (guided) by the outer rail 53 by the second holes 60a and 60b at the opposing positions. Similarly, the outer spacers 57 and 58 are not regulated (guided) by the inner rail 43 by the first holes 61a and 61b located at opposing positions. Therefore, at the fitting start position, the first positioning pin 41 and the second positioning pin 42 are not restricted by the inner spacers 47, 48, the outer spacers 57, 58, and the like, and the first positioning hole 51 and the second positioning pin 42 are not restricted. It can be fitted into the hole 52.

Similarly, the gap when the feeding cassette 4 is in the fitting position from the fitting start position is as shown in FIGS. 8A and 8B. The gap between the inner rail 43 and the outer spacer 57 is as follows. is D _1, the gap between the inner rail 43 and the outer spacer 58 is _{D 2.} Further, the gap between the outer rail 53 and the inner spacer 47 is _{D 3,} the gap between the outer rail 53 and the inner spacer 48 is _{D 4.}

As described above, in the first embodiment, the first hole portion is formed in the inner rails 43 and 44 so that the gap does not disappear even if the components constituting the gaps D ₁ , D ₂ , D ₃ , and D ₄ vary. 61a and 61b are formed, and second holes 60a and 60b are formed in the outer rails 53 and 54, respectively. Therefore, from the fitting start position to the fitting position, the inner rail 43 and the outer spacers 57 and 58 are not in contact, and the outer rail 53 and the inner spacers 47 and 48 are not in contact. Thereby, the frictional force due to the contact between the rail and the spacer is not generated, and the fitting can be performed without interference with the rail and the spacer. As a result, the operation force at the time of attachment / detachment can be reduced.

  In addition, since the first positioning pin 41 and the second positioning pin 42 are configured to be fitted into the first positioning hole 51 and the second positioning hole 52 at the time of fitting, the horizontal direction (see FIG. It can be positioned without rotating in the direction of the arrow Y shown in FIG.

  As described above, the feeding cassette 4 and the apparatus main body 5 according to the first embodiment are arranged in the horizontal direction of the feeding cassette 4 without deteriorating the operability of the feeding cassette 4 when the feeding cassette 4 is mounted. The movement can be reliably controlled.

Second Embodiment
Next, an image forming apparatus 1A according to a second embodiment of the present invention will be described with reference to FIGS. 9A to 13B while using FIG. In the image forming apparatus 1A according to the second embodiment, the positioning positions of the positioning pins and the positioning blocks are provided, and the inner rails 43 and 44 are provided with relief portions 43c instead of the first holes 61a and 61b. This is different from the first embodiment. Therefore, in 2nd Embodiment, it demonstrates centering on the point which is different from 1st Embodiment, ie, the arrangement position of a positioning pin, a positioning block, and the escape part 43c. Note that in the second embodiment, the same components as those in the image forming apparatus 1 according to the first embodiment are denoted by the same reference numerals, and description thereof is omitted. That is, in the second embodiment, the same configuration as in the first embodiment has the same effect as in the first embodiment.

  First, the overall configuration of the image forming apparatus 1A according to the second embodiment will be described with reference to FIGS. 9A to 10 while using FIG. FIG. 9A is a perspective view of the feeding cassette 4A according to the second embodiment as viewed from above. FIG. 9B is a perspective view of the feeding cassette 4A as viewed from below. FIG. 10 is a perspective view schematically showing a part of the internal structure of the apparatus main body 5A according to the second embodiment.

  As shown in FIG. 1, the image forming apparatus 1 </ b> A includes an image forming apparatus main body 2 that forms an image on a sheet S, and a sheet feeding apparatus 3 </ b> A that feeds the sheet S to the image forming apparatus main body 2. 9A and 9B, the feeding cassette 4A includes a cassette body 40A, positioning pins 42A, positioning blocks 49a and 49b, inner rails 43A and 44, inner bearings 45, 46 and inner spacers 47 and 48. The positioning pin 42A is provided at a substantially central portion on the back X2 side in the slide direction X of the cassette body 40A. The positioning blocks 49a and 49b are provided on both sides of the positioning pin 42A, and are formed so as to contact the inner wall of the housing 50A at the fitting position. The inner rail 43A is provided with an escape portion 43c as a release portion of the restricting means on the front X1 side in the slide direction X (see FIGS. 12B and 13B). The escape portion 43c is formed so as to expand in a direction away from the outer spacers 57 and 58, and is provided to increase the gap between the outer spacers 57 and 58 from the fitting start position to the fitting position. Yes.

  As shown in FIG. 10, the apparatus main body 5A includes a housing 50A, positioning holes 52A, outer rails 53 and 54, outer bearings 55 and 56, and outer spacers 57 and 58. A positioning hole 52A is provided in the upper surface inside the housing 50A, and the positioning hole 52A is formed so that the positioning pin 42A can be fitted therein. In the second embodiment, the positioning pin 42A is fitted in the positioning hole 52A, and the positioning blocks 49a and 49b are in contact with the housing 50A, so that the feeding cassette 4A is positioned at the sheet feeding position of the apparatus main body 5. Is done. This fitting position becomes the sheet feeding position.

  Next, the gap between the inner spacers 47 and 48 and the outer rail 53 and the gap between the outer spacers 57 and 58 and the inner rail 43A will be described with reference to FIGS. 11 (a) to 13 (b). FIG. 11A is a cross-sectional view taken along line AA shown in FIG. 3 in a state where the feeding cassette 4 according to the second embodiment is pulled out from the apparatus main body 5. FIG.11 (b) is BB arrow sectional drawing shown in FIG. FIG. 12A is a cross-sectional view taken along line AA shown in FIG. 3 in a state immediately before the feeding cassette 4 according to the second embodiment is fixed to the apparatus main body 5 by the positioning pins 42A. FIG.12 (b) is BB arrow sectional drawing shown in FIG. FIG. 13A is a cross-sectional view taken along line AA shown in FIG. 3 in a state in which the feeding cassette 4 according to the second embodiment is fixed to the apparatus main body 5 by the positioning pins 42A. FIG. 13B is a cross-sectional view taken along arrow BB shown in FIG.

As shown in FIGS. 11 (a) and 11 (b), the state in which the feeding cassette 4A is in the drawer position is the same as that in the first embodiment, and the description thereof is omitted here. Next, the gap when the feeding cassette 4A is in the mating position from the mating start position is the gap between the inner rail 43A and the outer spacer 57, as shown in FIGS. the gap between the inner rail 43A and the outer spacer 58 is _{D 11.} Further, the gap between the outer rail 53 and the inner spacer 47 is _{D 12,} the gap between the outer rail 53 and the inner spacer 48 is _{D 13.}

In the second embodiment, the escape portion 43c is formed so that the gap between the inner rail 43A and the outer spacer 57 and the gap between the inner rail 43A and the outer spacer 58 are enlarged. Relief portion 43c, in a case where variation of the dimensions of such outer spacer 57, 58 gap D ₁₁ constitute occurs is also formed so as not to run out gap. Similarly, the gap _{D 12} and _{D 13,} the second hole portion 60a, a 60b, variation of the size of such inner spacers 47 and 48 even if generated, are formed so as not lost gap.

Also, the gap _{D 11} is set to be smaller than the gap _{D 12} and _{D 13.} Therefore, for example, even when the user touches the feeding cassette 4A at the fitting start position, the feeding cassette 4A is not rotated in the arrow Y direction shown in FIG. .

  As described above, in the second embodiment, even when the positioning member is concentrated on the back X2 side in the sliding direction X of the feeding cassette 4A, it is possible to suppress the play of the feeding cassette 4A, and a high-class feeling is achieved. Can be improved. Further, as in the first embodiment, the frictional force due to the contact between the rail and the spacer is not generated, and the fitting can be performed without interference with the rail and the spacer, so that the operation force at the time of attachment / detachment is reduced. Can do.

For example, when the rigidity of the feeding cassette is low, the operation force is affected even if the inner rail 43A, the outer spacer 57, and the outer spacer 58 are set to contact each other (gap D ₁₁ = 0). It is possible to prevent the play cassette 4A from rattling.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above. In addition, the effects described in the embodiments of the present invention only list the most preferable effects resulting from the present invention, and the effects of the present invention are not limited to those described in the embodiments of the present invention.

  For example, in the present embodiment, the restricting means is configured by forming the first hole portion and the second hole portion as the release portion on the inner rail and the outer rail, but the present invention is not limited to this. For example, the restricting means is configured to widen the width of the outer rail or narrow the width of the inner rail by reaching the fitting start position, thereby releasing the guide (regulation) of the feeding cassette in the horizontal direction. It may be.

  In this embodiment, a guide member is provided in the apparatus main body and the feeding cassette, and a guided member corresponding to the guide member is provided in the apparatus main body and the feeding cassette. However, the present invention is not limited to this. For example, a guide member may be provided on one of the apparatus main body and the feeding cassette, and a guided member may be provided on the other of the apparatus main body and the feeding cassette.

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 2 Image forming apparatus main body 3 Sheet feeding apparatus 4 Feed cassette 5 Apparatus main body 22 Image forming part 41 1st positioning pin (fitting protrusion)
42 Second positioning pin (fitting protrusion)
43, 44 Inner rail (guided member)
47, 48 Inner spacer (guided member)
51 First positioning hole (fitting hole)
52 Second positioning hole (fitting hole)
53, 54 Outer rail (guide member)
57, 58 Outer spacer (guide member)
60a, 60b 2nd hole (release part)
61a, 61b 1st hole (release part)

Claims (6)

The device body;
A feeding cassette that is slidable between a sheet feeding position where sheets are fed and a sheet is fed and a drawing position pulled out from the apparatus body;
A fitting projection provided on one of the apparatus main body and the feeding cassette and a fitting hole provided on the other of the apparatus main body and the feeding cassette; and the feeding cassette slides to the sheet feeding position. Positioning means for positioning the position of the feeding cassette by moving the fitting projection into the fitting hole when moving;
An outer rail provided in the apparatus body;
An inner rail provided in the feeding cassette;
An inner spacer provided on the inner rail and capable of contacting the outer rail from a horizontal direction;
An outer spacer provided on the outer rail and capable of contacting the inner rail from a horizontal direction;
A first release portion that is formed on the back side of the outer rail in the mounting direction of the feeding cassette and releases the contact between the inner spacer and the outer rail;
A second release portion that is formed on the near side of the inner rail in the mounting direction of the feeding cassette and releases the contact between the outer spacer and the inner rail;
When the feeding cassette slides, the inner spacer and the outer spacer are in contact with the outer rail and the inner rail, respectively, from the drawing position to the fitting start position where the fitting of the positioning means is started. The horizontal movement perpendicular to the sliding direction of the feeding cassette is restricted, and the inner spacer and the second releasing part are moved from the fitting start position to the sheet feeding position by the first releasing part and the second releasing part. The outer spacer is released from contact with the outer rail and the inner rail,
A sheet feeding apparatus characterized by that. The first release portion and the second release portion have a length corresponding to the amount of movement of the feeding cassette from the fitting start position to the sheet feeding position, and are formed in the sliding direction of the feeding cassette. ing,
The sheet feeding apparatus according to claim 1. The outer spacer is disposed on both sides of the inner rail in the horizontal direction, and the inner spacer is disposed on both sides of the outer rail in the horizontal direction.
The sheet feeding apparatus according to claim 1, wherein the sheet feeding apparatus is a sheet feeding apparatus. The positioning means are respectively provided on the back side and the front side in the sliding direction of the feeding cassette.
The sheet feeding device according to any one of claims 1 to 3, wherein the sheet feeding device is provided. The second release part is a hole or a relief part,
The sheet feeding device according to any one of claims 1 to 4, wherein the sheet feeding device is provided. A sheet feeding device according to any one of claims 1 to 5,
An image forming unit that forms an image on a sheet fed by the sheet feeding device;
An image forming apparatus comprising:

Images