JP2005231862A - Paper feeding cassette - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a cursor from moving widthwise when a user moves a paper feeding cassette in the direction of paper width with great force by a simple configuration never obstructing paper loading and paper feeding. <P>SOLUTION: The widthwise cursor 20 for positioning a paper sheet in the direction of width is provided inside a cassette frame 10. A lock piece 40 is rotatably supported in a face forming a right angle with the direction of paper width below the cursor widthwise 20. The lock piece 40 is energized in the direction of locking by an energizing means provided in its support shaft 41 part. An engaging hole 23 and a lock pin 42 are provided on a bottom face of the widthwise cursor 20 and an upper face of the lock piece 40, respectively, to lock the cursor 20 so that it is not displaced in the direction of paper width by inserting the lock pin 42 into the engaging hole 23. When pressing a release rod 50 provided on the cursor 20 downward, the lock piece 40 is displaced downward and moves to a lock release position. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a paper feed cassette used for stocking a large number of sheets to be supplied to an apparatus in advance.

  The paper feed cassette is used for feeding cut paper or the like in an image forming apparatus represented by a copying machine or a printer. Many paper feeders in an image forming apparatus stock a large number of papers before printing in a paper feed cassette and separate and feed the papers one by one from the uppermost layer of papers stacked in the cassette.

  Some paper cassettes are provided with a cursor. The cursor is movable along a rail provided in the paper feed cassette, and contacts the side surface of the paper stack stacked in the cassette to position the paper. As a result, the paper does not move from a predetermined position, and stable paper feeding can be performed.

  The cursor includes a length direction cursor for positioning the paper in the paper supply direction and a width direction cursor for positioning the paper in the paper width direction perpendicular to the paper supply direction. These cursors are provided with locking means for locking the cursor at a predetermined position corresponding to the paper size. As the locking means, one constituted by a saw-toothed rack and a lock piece provided with a locking claw that engages with this rack is generally widely used.

  However, when paper is loaded in the paper cassette and the user moves the paper cassette in the paper width direction, the paper bundle overcomes the restraint by the cursor and tries to move relative to the paper cassette due to inertia. A piece may move and unlock the cursor. As a result, the paper moves in the paper width direction together with the cursor. As a result, there is a problem that proper paper feeding cannot be performed, and problems such as misalignment of printed images and paper jam occur.

In order to solve such a problem, a technique for preventing unintentional movement of the locking piece for locking the width direction cursor at a predetermined position has been proposed, and an example of the paper feeding cassette can be seen in Patent Document 1. .
JP-A-8-239128 (page 3-4, Fig. 1-4)

  The paper feed tray (paper feed cassette) described in Patent Document 1 includes a pressure plate above the paper feed tray inside the paper feed tray insertion opening of the image forming apparatus into which the paper feed tray is inserted. Is inserted into the image forming apparatus, the pressure plate engages with the lock lever of the side fence (cursor) to prevent unintentional movement of the lock lever. However, when such a pressure plate is disposed above the paper feed cassette, the amount of paper sheets stored in the paper feed cassette is limited.

  Some sheet feeding cassettes have a sheet separation claw disposed at the downstream end in the sheet supply direction, and the uppermost sheet fed with sheet feeding is hooked on the separation claw so as to be separated from the lower layer sheet. In such a sheet feeding cassette, the uppermost sheet hooked by the separation claw is bent upward during sheet feeding. Therefore, if a pressure plate as described in Patent Document 1 exists above the sheet feeding cassette, May interfere with the paper feed.

  The present invention has been made in view of the above points, and in a paper feed cassette that stocks a large number of papers, the user can move the paper feed cassette with a simple configuration that does not interfere with paper stacking and paper feed. An object of the present invention is to provide a highly reliable paper feeding cassette capable of preventing the movement of the width direction cursor when it is frequently moved in the paper width direction.

  In order to solve the above-described problems, the present invention provides a cassette frame for stacking and storing sheets, a width direction cursor provided on the cassette frame, for positioning the sheet in the sheet width direction perpendicular to the sheet supply direction, and In addition, the paper feed cassette that can be pulled out from the apparatus body includes a lock piece that locks the width direction cursor at a predetermined position at the bottom of the cassette frame, and the lock piece engages with the width direction cursor from below. Thus, the width direction cursor is locked so as not to be displaced in the paper width direction.

  In addition, the lock piece includes an engaging portion that engages with the width direction cursor at a position corresponding to each width of a plurality of types of usable paper.

  In addition, biasing means for biasing the lock piece in the lock direction and release means for releasing the lock state of the lock piece are provided.

  Further, when the paper feed cassette is inserted into the device main body, the displacement in the unlocking direction of the lock piece is restricted by the displacement restricting surface provided in the device main body below the paper feed cassette.

  Also, an urging means for urging the lock piece in the unlocking direction is provided, and when the paper feed cassette is inserted into the device main body, the lock piece contacts a support surface provided on the device main body below the paper feed cassette. Thus, the lock piece is restrained at the lock position.

  According to the configuration of the present invention, in the paper feeding cassette that can be pulled out from the apparatus main body, the bottom of the cassette frame is provided with a lock piece for locking the width direction cursor at a predetermined position, and the lock piece is changed from the lower side to the width direction cursor. Since the engagement is locked so that the width direction cursor is not displaced in the paper width direction, there is no need to dispose a member related to the cursor lock above the paper feed cassette. Therefore, with a simple configuration that does not hinder paper stacking and paper feeding, it is possible to prevent movement in the paper width direction when the user moves the paper feeding cassette in the paper width direction. Is possible. Further, since it is not necessary to widen the space occupied by the paper feed cassette, it is possible to prevent the paper feed cassette and the equipment including the paper feed cassette from becoming large.

  In addition, since the lock piece includes an engaging portion that engages with the width direction cursor at a position corresponding to the width of each of a plurality of types of usable paper, any paper that can be used in the paper feed cassette is provided. Corresponding to the size, the width direction cursor can be locked. Thereby, it is possible to prevent movement of the paper in the width direction regardless of the paper size.

  Further, since the urging means for urging the lock piece in the lock direction and the release means for releasing the lock state of the lock piece are provided, the lock piece is automatically displaced to the lock position by the urging means. In addition, the unlocking can be easily performed by the releasing means. The width direction cursor can be locked by the lock piece with a simple configuration and operation.

  In addition, when the paper cassette is inserted into the device body, the displacement restriction surface provided on the device body below the paper cassette regulates the displacement of the lock piece in the unlocking direction. By inserting the paper feed cassette, the locked state of the width direction cursor can be firmly held. Thereby, the reliability with respect to prevention of movement of the paper in the width direction can be enhanced.

  Further, since the urging means for urging the lock piece in the unlocking direction is provided, the urging means can automatically displace the lock piece to the unlock position. Therefore, it is not necessary to separately prepare a member for performing the unlocking operation of the width direction cursor, so that the cost can be reduced and the trouble of the unlocking operation can be saved. Furthermore, when the paper feed cassette is inserted into the device main body, the lock piece is restrained at the lock position by being supported by the support surface provided on the device main body below the paper feed cassette. Therefore, the lock piece can be automatically displaced to the lock position and restrained only by inserting the paper feed cassette into the apparatus main body. Therefore, the cursor can be locked without taking time and the locked state can be firmly held.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  First, the outline of the structure of the paper feed cassette of the present invention will be described with reference to FIG. FIG. 1 is a perspective view of a paper feed cassette according to an embodiment of the present invention, as viewed from above the rear side. A panel is provided on the front side of the paper feed cassette to hang a finger and pull out the paper feed cassette, and the back is a surface facing this panel.

  In FIG. 1, a paper feed cassette 1 is accommodated in a lower part of an image forming apparatus such as a copying machine (not shown). The paper feed cassette 1 is inserted by horizontally sliding in the direction of arrow A shown in FIG. The main body of the paper feed cassette 1 is composed of a cassette frame 10. The cassette frame 10 is constituted by a flat box having an open upper surface, and stacks and accommodates sheets from the upper surface direction. Inside the image forming apparatus, a sheet feeding unit (not shown) is provided above the sheet feeding cassette 1, and the sheet is supplied in the direction of arrow B shown in FIG. A panel 3 is integrally formed on the front surface of the cassette frame 10, and this panel 3 plays a role of constituting a part of the housing at the lower front of the image forming apparatus. When pulling out the sheet cassette 1, a finger is put on the lower part of the panel 3.

  A lift plate 4 is provided on the inner bottom surface of the cassette frame 10. The paper is stacked on the lift plate 4. The upstream end of the lift plate 4 in the sheet supply direction is supported by the inner bottom surface of the cassette frame 10, and can rotate about the fulcrum and the downstream end as a free end. The lift plate 5 is a plate-like member, and a notch is provided in a movement area of a width direction cursor 20 and a length direction cursor 30 described later.

  A width direction cursor 20 is provided at the downstream side of the cassette frame 10 in the paper supply direction. Two width direction cursors 20 are provided, and abut against the side surface of the sheet bundle from both sides in the sheet width direction perpendicular to the sheet supply direction (arrow B). The width direction cursor 20 has an L-shaped vertical cross section viewed from the paper supply direction, and includes a horizontal portion 21 and a vertical paper abutting portion 22 (see FIG. 2). The two width direction cursors 20 are arranged so that the horizontal portions 21 face each other, and the sheets are stacked above the respective horizontal portions 21 and inside the sheet abutting portion 22. The width direction cursor 20 performs positioning in the width direction of the sheet so that the sheet is positioned at a sheet feeding position by the sheet feeding unit of the image forming apparatus.

  The width direction cursor 20 can be displaced along the movement groove 11 provided on the cassette frame 10 in the sheet width direction. Since the engagement portion (not shown) provided on the bottom surface of the width direction cursor 20 is caught in the movement groove 11, the width direction cursor 20 does not come off upward. An interlocking mechanism (not shown) is provided below the two width direction cursors 20 that come into contact with the side surface of the sheet bundle from both sides in the sheet width direction. The interlocking mechanism includes a rack provided in each of the two width direction cursors 20 and a pinion attached to the cassette frame 10. By this interlocking mechanism, when one of the width direction cursors 20 is displaced, the other is also displaced in conjunction therewith. At this time, the two width direction cursors 20 move symmetrically with respect to the center line in the width direction of the paper.

  A length direction cursor 30 is provided upstream of the cassette frame 10 in the paper supply direction. One length direction cursor 30 is provided and contacts the side surface of the sheet bundle from the upstream side in the sheet supply direction (arrow B). The length direction cursor 30 has an L-shaped vertical section viewed from the paper supply direction, and includes a horizontal portion 31 and a vertical paper abutting portion 32. The paper is stacked above the horizontal portion 31 and inside the paper abutting portion 32. The length direction cursor 30 performs positioning in the paper supply direction so that the downstream end of the paper is positioned at the paper feed position by the paper feed unit of the image forming apparatus.

  The length direction cursor 30 can be displaced along the moving rail 12 provided on the cassette frame 10 in the paper supply direction. Since the engaging portion (not shown) provided on the bottom surface of the length direction cursor 30 is engaged with the moving rail 12, the length direction cursor 30 does not come off upward.

  Next, the detailed configuration of the width direction cursor 20 in the paper feed cassette 1 according to the first embodiment of the present invention will be described with reference to FIGS. 2 is a schematic vertical cross-section right side view showing a width direction cursor mounting portion of the paper feed cassette, and FIG. 3 is a schematic vertical cross-section front view. 4 is a model vertical sectional right side view similar to FIG. 2, showing the unlocked state of the locking piece, and FIG. 5 is also a model vertical sectional partial front view. FIG. 6 is a right side view of a model vertical cross section of the paper feed cassette and shows a state in which the paper feed cassette is housed in the image forming apparatus. 2 and 4, the left side indicates the front side of the sheet feeding cassette 1, and the right side indicates the back side.

  2 and 3, a lock piece 40 that locks the width direction cursor 20 at a predetermined position is provided at the bottom of the cassette frame 10 and below the width direction cursor 20. The lock piece 40 is a plate-like member extending in the paper width direction, and is attached to the opening 13 provided in the cassette frame 10 extending in the paper width direction. As shown in FIGS. 3 and 5, the lock piece 40 can rotate within a plane perpendicular to the paper width direction, with the support shaft 41 at the upstream end as a center and the downstream end as a free end. It is supported by. The support shaft 41 is provided with a torsion coil spring which is a biasing means (not shown), and the lock piece 40 is biased counterclockwise, that is, in the lock direction. The torsion coil spring can be replaced with an elastic member such as a leaf spring, rubber, or sponge, or other urging means.

  On the upper surface of the lock piece 40, a lock pin 42 that is an engaging portion with the width direction cursor 20 is provided. The lock pin 42 is provided at a position corresponding to the width of each of a plurality of types of paper that can be used in the paper feed cassette 1. The lock pin 42 is configured such that one pin corresponding to the width of the sheet is symmetrically arranged on the left and right of the center line in the width direction with respect to each of the two width direction cursors 20.

  An engagement hole 23 is provided on the bottom surface of the horizontal portion 21 of each of the two width direction cursors 20. As shown in FIGS. 2 and 3, when the lock piece 40 is in the lock position, the lock pin 42 is inserted into the engagement hole 23, and the width direction cursor 20 is locked so as not to be displaced in the sheet width direction.

  2 and 3, the width direction cursor 20 on the front side of the paper feed cassette 1 is provided with a release rod 50 as a means for releasing the lock piece 40 on the front side. A vertical slot 51 is provided in the lower part of the release rod 50. The width direction cursor 20 is provided with two horizontal pins 24 attached at intervals in the vertical direction, and the horizontal pins 24 are inserted into the elongated holes 51. Accordingly, the release rod 50 can be displaced in the vertical direction so that the long hole 51 extends along the two horizontal pins 24. Since the periphery of the release rod 50 is covered with the cover 52, it does not come off in the paper width direction.

  Further, the release rod 50 is always urged upward by an urging means (not shown). An engagement pin 53 that engages with the lock piece 40 is provided at the lower end of the release rod 50, and a button portion 54 is provided at the upper part. The release rod 50 is displaced to the lock release position shown in FIGS. 4 and 5 by pushing the button portion 54 downward with a finger. At this time, when the engaging pin 53 contacts the lock piece 40, the downstream end of the lock piece 40 is displaced downward, and the lock piece 40 is displaced to the unlocking position.

  When the paper feed cassette 1 is inserted and stored in the image forming apparatus, the paper feed cassette 1 is positioned immediately above the frame 100 of the image forming apparatus as shown in FIG. A clearance is provided between the paper feed cassette 1 and the frame 100 so that the paper feed cassette 1 can be moved smoothly. However, this clearance is minute, and the upper surface of the frame 100 serves as a displacement regulating surface 101 that regulates the displacement of the lock piece 40. That is, in the storage state of the paper feed cassette 1, the lock piece 40 can be slightly displaced in the unlocking direction, but the engagement between the lock pin 42 of the lock piece 40 and the engagement hole 23 of the width direction cursor 20. It is impossible to displace until the condition is solved.

  Thus, the lock piece 40 for locking the width direction cursor 20 at a predetermined position is provided at the bottom of the cassette frame 10, and the lock piece 40 is engaged with the width direction cursor 20 from below and the width direction cursor 20 is engaged. Is locked so as not to be displaced in the paper width direction, it is not necessary to dispose a member related to the cursor lock above the paper feed cassette 1. Therefore, with a simple configuration that does not hinder paper stacking and paper feeding, it is possible to prevent the paper from moving in the width direction when the user vigorously moves the paper feeding cassette 1 in the paper width direction. Is possible. Further, since it is not necessary to widen the space occupied by the paper feed cassette 1, it is possible to prevent the paper feed cassette 1 and the image forming apparatus, which is a device equipped with the paper feed cassette 1, from increasing in size.

  In addition, the lock piece 40 includes a lock pin 42 that is an engaging portion that engages with the width direction cursor 20 at a position corresponding to the width of each of a plurality of types of usable paper. The width direction cursor 20 can be locked in correspondence with any possible paper size. Thereby, it is possible to prevent movement of the paper in the width direction regardless of the paper size.

  Moreover, since the torsion coil spring which is an urging means for urging the lock piece 40 in the lock direction and the release rod 50 which is a release means for releasing the lock piece 40 are provided, the lock piece 40 is moved by the torsion coil spring. It can be automatically displaced to the locked position, and unlocking can be easily performed by the release rod 50. The width direction cursor 20 can be locked by the lock piece 40 with a simple configuration and operation.

  Further, when the paper feed cassette 1 is inserted into the image forming apparatus that is the main body of the apparatus, the displacement regulating surface 101 provided on the frame 100 of the image forming apparatus below the paper feed cassette 1 causes the lock piece 40 to move in the unlocking direction. Since the displacement is restricted, the locked state of the width direction cursor 20 can be firmly held by inserting the paper feed cassette 1 into the image forming apparatus. Thereby, the reliability with respect to prevention of movement of the paper in the width direction can be enhanced.

  Next, a detailed configuration of the width direction cursor 20 in the paper feed cassette 1 according to the second embodiment of the present invention will be described with reference to FIGS. FIG. 7 is a schematic right side view of a vertical cross section showing a width direction cursor mounting portion of the paper feed cassette. FIG. 8 is a partially enlarged schematic vertical sectional view showing the periphery of the end of the lock piece, showing the unlocked state of the width direction cursor, and FIG. 9 shows the locked state. FIG. 10 is a schematic vertical sectional front view of a sheet feeding cassette, and FIG. 11 is a schematic partial top view of the same. FIG. 12 is a right side view of a model vertical cross section of the paper feeding cassette and shows a state in which the paper feeding cassette is housed in the image forming apparatus. Since the basic configuration of this embodiment is the same as that of the first embodiment described with reference to FIGS. 2 to 6, the same reference numerals are assigned to the same components as those of the first embodiment. The description will be omitted.

  In FIG. 7, a lock piece 40 that locks the width direction cursor 20 at a predetermined position is provided at the bottom of the cassette frame 10 and below the width direction cursor 20. One end of each locking piece 40 in the paper width direction is provided with one connecting member 43 that can telescopically expand and contract by a predetermined stroke. The locking piece 40 is supported by the cassette frame 10 via this connecting member 43. ing. Thereby, the lock piece 40 is movable in the up-down direction as shown in FIGS. 8 and 9. Around the connecting member 43, a spring 44 that is an urging means for urging the lock piece 40 is provided. The spring 44 is composed of a compression coil spring. Due to the action of the spring 44, the lock piece 40 is urged downward, that is, in the unlocking direction. The spring 44 can be replaced with an elastic member such as a leaf spring, rubber, or sponge, or other urging means.

  7, 10, and 11, a positioning lever 60 for positioning the width direction cursor 20 is attached to the front side of the width direction cursor 20 of the sheet feeding cassette 1. As shown in FIG. 10, the positioning lever 60 is rotatable in a plane perpendicular to the paper width direction around a support portion 61 provided substantially at the center in the vertical direction. An engaging projection 62 that engages with the cassette frame 10 is provided at the lower end of the positioning lever 60. A button portion 63 is provided on the upper portion of the positioning lever 60. Since the periphery of the positioning lever 60 is covered with the cover 64, it does not come off in the paper width direction.

  The positioning lever 60 is for setting the width direction cursor 20 at a predetermined position in accordance with the width of the paper loaded in the paper feed cassette 1. The positioning lever 60 may be weak in the action of keeping the width direction cursor 20 in a predetermined position with respect to the load that the width direction cursor 20 receives from the sheet bundle. The width direction cursor 20 is locked by the lock piece 40.

  10 and 11, an engagement groove 14 that engages with the positioning lever 60 is provided on the inner bottom surface of the cassette frame 10. As shown in FIG. 11, the engagement groove 14 is provided at a position corresponding to the width of each of a plurality of types of paper usable in the paper feed cassette 1.

  In FIG. 10, the positioning lever 60 is always urged counterclockwise by urging means (not shown). Thereby, when the engaging protrusion 62 of the positioning lever 60 is engaged with the engaging groove 14 of the cassette frame 10, the width direction cursor 20 is positioned. The positioning lever 60 is displaced to the positioning release position by pushing the button portion 63 downstream with the finger in the paper supply direction.

  In FIG. 12, when the paper feed cassette 1 is inserted into the image forming apparatus, the frame 100 of the image forming apparatus is disposed immediately below the paper feed cassette 1, that is, in the unlocking direction of the lock piece 40. A support surface 102 of the lock piece 40 is provided on the upper surface of the frame 100, and the lock piece 40 is supported by being in contact with the support surface 102. Thereby, the lock piece 40 is displaced upward against the elastic force of the spring 44 and is restrained at the lock position.

  Thus, since the spring 44 which is an urging means for urging the lock piece 40 in the unlocking direction is provided, the lock piece 40 can be automatically displaced to the unlock position by the spring 44. Therefore, it is not necessary to separately prepare a member for performing the unlocking operation of the width direction cursor 20, so that the cost can be reduced and the trouble of the unlocking operation can be saved. Further, when the paper feed cassette 1 is inserted into the image forming apparatus that is the apparatus main body, the lock piece 40 is supported by being in contact with and supported by the support surface 102 provided on the frame 100 below the paper feed cassette 1. Since 40 is restrained at the lock position, the lock piece 40 can be automatically displaced to the lock position and restrained only by inserting the paper feed cassette 1 into the image forming apparatus. Therefore, the width direction cursor 20 can be locked without taking time and the locked state can be firmly held.

  Although the embodiment of the present invention has been described above, various modifications can be made without departing from the spirit of the present invention.

  The present invention can be used in all sheet feeding cassettes that include a cursor for positioning a sheet at an appropriate sheet feeding position and can be pulled out from the apparatus main body.

These are the perspective views of the paper feed cassette which concerns on embodiment of this invention, and are seen from the back side upper direction. These are the model vertical cross-section right side views which show the width direction cursor attachment part of the paper feed cassette which concerns on the 1st Embodiment of this invention. FIG. 3 is a partial vertical sectional front view of the paper feed cassette shown in FIG. 2. Fig. 2 is a right side view of a model vertical cross section similar to Fig. 2 and shows the unlocked state of the lock piece. [Fig. 5] is a partial vertical sectional front view of the paper feed cassette shown in Fig. 4. FIG. 2 is a right side view of a schematic vertical section of the paper feed cassette shown in FIG. 2 and shows a state in which the paper feed cassette is housed in the image forming apparatus. These are the model vertical cross-section right side views which show the width direction cursor attachment part of the paper feed cassette which concerns on the 2nd Embodiment of this invention. Fig. 7 is a schematic vertical sectional partial enlarged view of the periphery of the lock piece end portion of the paper feed cassette shown in Fig. 7 and shows the unlocked state of the width direction cursor. Fig. 9 is a model vertical sectional partial enlarged view similar to Fig. 8, showing the locked state of the width direction cursor. FIG. 8 is a partial vertical cross-sectional front view of the paper feed cassette shown in FIG. 7. FIG. 8 is a schematic partial top view of the paper feed cassette shown in FIG. 7. Fig. 7 is a right side view of a schematic vertical section of the paper feed cassette shown in Fig. 7 and shows a state in which it is housed in the image forming apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Paper feed cassette 10 Cassette frame 13 Opening 14 Engagement groove 20 Width direction cursor 21 Horizontal part 23 Engagement hole 40 Lock piece 41 Support shaft 42 Lock pin 43 Connecting member 44 Spring (biasing means)
50 Release rod 53 Engagement pin 60 Positioning lever 62 Engagement protrusion 100 Frame 101 Displacement restricting surface 102 Support surface

Claims (5)

A cassette frame for loading and storing sheets, and a width direction cursor provided on the cassette frame for positioning the sheet in the sheet width direction perpendicular to the sheet supply direction, and capable of being pulled out from the apparatus body In the cassette
A lock piece for locking the width direction cursor at a predetermined position is provided at the bottom of the cassette frame, and the lock piece engages with the width direction cursor from below so that the width direction cursor is not displaced in the paper width direction. A paper feed cassette characterized by locking.   The paper feed cassette according to claim 1, wherein the lock piece includes an engagement portion that engages with the width direction cursor at a position corresponding to each width of a plurality of types of usable paper.   The sheet feeding cassette according to claim 1, further comprising: an urging unit that urges the lock piece in a locking direction; and a release unit that releases the lock state of the lock piece.   The displacement of the lock piece in the unlocking direction is regulated by a displacement regulating surface provided in the equipment body below the paper cassette when the paper cassette is inserted into the equipment body. The paper cassette described in 1.   There is provided an urging means for urging the lock piece in the unlocking direction, and when the paper feed cassette is inserted into the device main body, the lock piece comes into contact with a support surface provided on the device main body below the paper feed cassette. 3. The paper feed cassette according to claim 1, wherein the lock piece is restrained at the lock position by being supported.

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