JP4526118B2 - Image forming apparatus - Google Patents

Description

  The present invention relates to an image forming apparatus having a drawer.

  2. Description of the Related Art An image forming apparatus having an apparatus main body and a drawer that is detachably mounted on the apparatus main body has been conventionally known. Such an image forming apparatus is configured as a copier, a printer, a facsimile, or a complex machine thereof. (For example, refer to Patent Document 1). In this type of conventional image forming apparatus, when the drawer body is pushed inward, a positioning pin provided on the other side is fitted into a positioning hole formed in one of the apparatus main body and the drawer body. Thus, the drawer was positioned with respect to the apparatus main body. However, when the total weight of the drawer body and the apparatus mounted on the drawer body increases, when the drawer body is pushed into the image forming apparatus main body, a large force is required to fit the positioning pin and the positioning hole. Sex is reduced.

Japanese Patent No. 2698135

  SUMMARY OF THE INVENTION An object of the present invention is to provide an image forming apparatus having a drawer that can eliminate the above-mentioned conventional drawbacks and can position the drawer with respect to the apparatus main body with a smaller force than the conventional one.

  In order to achieve the above-mentioned object, the present invention provides an image forming apparatus having a drawer that is pulled forward with respect to the apparatus main body or is pushed inward to be positioned in the apparatus main body. A control member assembled in a possible manner, a positioning lock member provided at a back side portion of the control member, and a cam provided around a hole formed in a back side portion of the apparatus main body. When the body is pushed in the back direction and the positioning lock member provided in the regulation member is passed through the hole formed in the back side portion of the apparatus main body, the positioning member is rotated. The cam surface of the cam is formed so that the member is guided to the cam surface of the cam, and the positioning lock member and the regulating member move in the back direction together with the drawer, and the regulating member is attached to the drawer. The puller is provided with a booster, and the booster is configured to move the regulating member toward the front with respect to the drawer in order to pull out the drawer. When it is moved to the position, it is pressurized by the pressure part of the regulating member and presses the back side part of the apparatus main body with a force larger than the applied pressure, and the pulling body is moved forward by the reaction force. The first link is rotatably connected to the drawer, and the second link is connected to the one end side so as to be rotatable relative to the first link. Then, the arm length from the rotation center of the first link relative to the drawer to the pressed portion of the first link pressurized by the pressure member of the regulating member is the first length relative to the drawer. The second link is first from the center of rotation of the link. It is set to be longer than the arm length to the center of rotation when rotating relative to the link, and the first link is rotated by being pressed by the pressure member of the restricting member. When the second link rotates relative to the first link, the second link moves in the back direction with respect to the drawer, and the other end of the second link An image forming apparatus is proposed in which is configured to press the back side portion of the apparatus main body (claim 1).

  Further, in the image forming apparatus according to claim 1, it is advantageous that a plurality of the positioning lock members are provided, and the positioning lock members are arranged symmetrically with respect to the central axis of the restricting member ( Claim 2).

  Furthermore, in the image forming apparatus according to claim 1 or 2, a positioning hole is formed in a back side portion of the apparatus main body, a positioning pin is provided in a back side part of the drawer, and the positioning lock member is When the guide surface of the cam occupies the position in the farthest direction, the stepped portion of the positioning pin is pressed against the back side portion of the apparatus main body, and the drawer is positioned in the front-rear direction. It is advantageous that the back side portion of the apparatus main body provided with the cam and the back side portion of the apparatus main body formed with the positioning hole are the same member (Claim 3).

  The image forming apparatus according to claim 1 or 2, wherein a positioning hole is formed in a back side portion of the drawer body, a positioning pin is provided in a back side portion of the apparatus main body, and the positioning lock member is When guided by the cam surface of the cam and occupies the position in the innermost direction, the stepped portion of the positioning pin is pressed against the inner side of the drawer, and the drawer is positioned in the front-rear direction. It is advantageous that the back side portion of the apparatus main body provided with the cam and the back side portion of the apparatus main body formed with the positioning pins are the same member (claim 4).

  Furthermore, in the image forming apparatus according to any one of claims 1 to 4, it is advantageous that the positioning lock member is formed of a roller (claim 5).

  Further, in the image forming apparatus according to any one of claims 1 to 5, the portion of the booster that presses the back side portion of the apparatus main body is located substantially at the center in the width direction of the drawer. (Claim 6).

  Furthermore, in the image forming apparatus according to any one of claims 1 to 6, the pressurizing portion of the restricting member can pressurize the booster when the restricting member is in any angular position. It is advantageous if constituted (claim 7).

  8. The image forming apparatus according to claim 1, wherein a positioning pin is provided on one of the drawer body and the apparatus main body, a positioning hole is formed on the other side, and the drawer body is the apparatus main body. When the positioning pin is positioned at a predetermined position, a portion other than the tapered tip portion of the positioning pin is fitted in the positioning hole, and at least the portion other than the tapered tip portion of the positioning pin is fitted with the positioning hole. It is advantageous that the operation of moving the drawer body in the forward direction by the booster is performed until the engagement is released (Claim 8).

  According to the present invention, the drawer body can be positioned and locked with respect to the apparatus body with a smaller force than before, and the operability can be improved.

  Embodiments of an image forming apparatus according to the present invention will be described below.

  FIG. 1 is a vertical sectional view of an image forming apparatus. The image forming apparatus shown here includes a paper feed table 200, an image forming unit 100 supported by the paper feed table 200, and a scanner 300 mounted thereon. Further, an automatic document feeder 400 attached thereon is provided. The scanner 300 includes a contact glass 32 on which a document (not shown) is placed, a first traveling body 33 that is disposed below the contact glass 32 and includes a light source and a first mirror, and second and third mirrors. 2 It has the traveling body 34, the imaging lens 35, and the reading sensor 36 which consists of CCD, for example.

  When taking a copy using the image forming apparatus shown in FIG. 1, a document is set on the document table 30 of the automatic document feeder 400 or the automatic document feeder 400 is opened and the contact glass 32 of the scanner 300 is opened. Then, the automatic document feeder 400 is closed, and the original on the contact glass 32 is pressed by the device 400. When a start switch (not shown) is pressed, when an original is set on the automatic document feeder 400, the original is transferred onto the contact glass 32 and then set on the contact glass 32. Immediately, the scanner 300 starts operating, and the first and second traveling bodies 33 and 34 move to the right in FIG. 1 from their home positions. At this time, the document placed on the contact glass 32 is illuminated by the light emitted from the light source of the first traveling body 33, and the reflected light is reflected on the first mirror of the first traveling body 33 and the second mirror of the second traveling body. The document image is reflected by the second and third mirrors, passes through the imaging lens 35, forms an image on the reading sensor 36, and the content of the document image is read.

  On the other hand, in the image forming unit 100, a recorded image corresponding to the image information read as described above is formed as follows.

  The image forming unit 100 shown in FIG. 1 includes first to fourth image forming means 18Y, 18C, 18M, 18BK arranged in the apparatus main body 101, and first to third support rollers 14, 15, The intermediate transfer member 10 is composed of an endless belt wound around 16 and the intermediate transfer member 10 is driven to rotate in the direction of the arrow. Each of the image forming units 18Y to 18BK has image carriers 40Y, 40C, 40M, and 40BK made of a drum-shaped photoconductor, and an exposure device 21 is disposed above the image carriers. The exposure device 21 emits writing light modulated in accordance with the image information read by the scanner 300 as described above, and the writing light is applied to the charged image carriers 40Y to 40BK. Thereby, an electrostatic latent image is formed on each image carrier. These electrostatic latent images are developed by a developing device as known per se, and a yellow toner image, a cyan toner image, a magenta toner image, and a black toner image are formed on the image carriers 40Y to 40BK, respectively. . These toner images are transferred onto the intermediate transfer member 10 that is rotationally driven in the direction of the arrow by the action of the primary transfer devices 62Y, 62C, 62M, and 62BK, and a composite color image is formed on the intermediate transfer member 10. . The transfer residual toner adhering to each image carrier after the toner image transfer is removed by a cleaning device.

  On the other hand, a secondary transfer device 22 is provided on the side opposite to each image carrier with the intermediate transfer member 10 interposed therebetween. The secondary transfer device 22 illustrated here has an endless secondary transfer belt 24 that is stretched over two rollers 23 and 23 and is driven to rotate in the direction of the arrow. It is pressed against the third support roller 16 via the transfer body 10.

  As shown in FIG. 1, a recording medium (not shown) made up of a plurality of paper feed cassettes 44 and transfer paper or resin sheets accommodated in the paper feed cassettes 44 is fed into the paper feed table 200. A paper feeding device 43 having a paper feeding roller 42 is provided. As the start switch is pressed, the paper feed roller 42 corresponding to any one of the selected paper feed cassettes 44 rotates, and the recording medium loaded in the paper feed cassette 44 is sent out. The fed recording medium is separated one by one by the separation roller 45 and enters the paper feed path 46, and is then conveyed by the conveyance roller 47 to the paper feed path 48 of the image forming unit 100, and a registration roller pair 49. Stopped by hitting.

  Alternatively, a recording medium is set on the manual feed tray 51, the recording medium is sent out by rotation of the paper feed roller 50, the recording medium is separated one by one by the separation roller 52, and one separated recording medium is manually fed. It is also possible to guide to the paper feed path 53 and abut against the pair of registration rollers 49 to stop.

  In either case, the pair of registration rollers 49 starts to rotate at the timing when the composite color image transferred onto the intermediate transfer body 10 is aligned with the recording medium, and thereby, between the intermediate transfer body 10 and the secondary transfer belt 24. The recording medium is conveyed, and the composite color image on the intermediate transfer body 10 is secondarily transferred to the recording medium by the action of the secondary transfer device 22. The transfer residual toner that is not transferred to the recording medium and is attached to the intermediate transfer member 10 is disposed on the intermediate transfer member 10 so as to face the second support roller 15 and sandwich the intermediate transfer member 10. And the surface of the intermediate transfer member 10 is cleaned. The registration roller pair 49 is generally used while being grounded, but a bias can be applied to the registration roller pair 49 for removing paper dust.

  The recording medium to which the composite toner image has been transferred is subsequently carried on the secondary transfer belt 24 and conveyed, and then passes through the fixing device 25. At this time, the composite color image is fixed on the recording medium by the action of heat and pressure. The The recording medium that has passed through the fixing device 25 is discharged onto a discharge tray 57 by a discharge roller 56. The fixing device 25 shown in FIG. 1 has an endless fixing belt 26 and a pressure roller 27 pressed against the fixing belt 26, and a recording medium is conveyed between the fixing belt 26 and the pressure roller 27. Sometimes, the composite color image is fixed on the recording medium by the action of heat and pressure.

  In the image forming apparatus shown in FIG. 1, a sheet reversing device 28 for reversing the recording medium is provided below the secondary transfer device 22 and the fixing device 25 so as to form images on both sides of the recording medium. When forming images on both sides of the recording medium, the recording medium that has passed through the fixing device 25 is sent to the sheet reversing device 28 by switching the switching claw 55, where the front and back of the recording medium are reversed and the intermediate transfer is performed again. The image is fed between the body 10 and the secondary transfer device 22, the composite color image on the intermediate transfer body 10 is transferred also to the back surface of the recording medium, the image is fixed by the fixing device 25, and then the recording medium is discharged. The paper is discharged onto the paper discharge tray 57 by the paper roller 56.

  FIG. 2 is a perspective view showing the image forming unit 100 with the exterior cover of the apparatus main body 101 removed. As can be seen from this figure, the image forming unit 100 includes an apparatus main body 101 and a drawer body 102 that is detachably attached to the apparatus main body 101.

  As shown in FIG. 3, the drawer body 102 of this example includes a front side plate 103, a rear side plate 104, stays 105 and 106 that fixably connect these side plates 103 and 104, and a bottom plate fixed to the side plates 103 and 104. 107. Slide rails 108 and 109 are fixed to the left and right portions of the drawer body 102, and these slide rails 108 and 109 are slidably fitted to mating slide rails 110 and 111 fixed to the apparatus main body 101. ing. As a result, the drawer body 102 is pulled out from the apparatus main body 101 in the front direction indicated by the arrow A in FIGS. 2 and 3 or is pushed in the rear direction indicated by the arrow B to position it in the apparatus main body. be able to. The directions of arrows A and B are the front-rear direction perpendicular to the paper surface of FIG. Thus, the drawer body 102 can be attached to and detached from the apparatus main body 101 in the front and rear directions A and B.

  The drawer 102 is mounted with devices related to the conveyance of the recording medium, such as the registration roller pair 49, the secondary transfer device 22, the fixing device 25, and the switching claw 55 shown in FIG. When the recording medium is jammed in the recording medium conveyance path constituted by these apparatuses, the drawer body 102 is pulled out in the front direction A. As a result, the recording medium conveyance path is exposed, so that the recording medium jammed here can be easily removed. After the jam processing is completed, the drawer body 102 is pushed in the depth direction B, the drawer body 102 is set in the apparatus main body 101, and the image forming operation can be resumed.

  4 and 5 are perspective views showing a state in which the drawer body 102 on which the apparatus related to the conveyance of the recording medium is mounted is positioned and set in the apparatus main body 101. FIG. In this state, positioning pins 114 and 115 projecting from the apparatus main body 101 are fitted into the positioning holes 112 and 113 formed in the front side plate 103 of the drawer body 102 as shown in FIG. In addition, the positioning pins 116 and 117 projecting from the rear plate 104 of the drawer body 102 shown in FIG. 3 are shown in the rear side portion of the apparatus main body 101 as shown in FIG. In the example, the drawer body 102 is positioned with respect to the apparatus main body 101 by fitting in each positioning hole 151 formed in the back side plate 131 (see also FIGS. 7 and 8). More specifically, these positioning pins 114, 115, 116, and 117 are formed from a tapered tip portion 118 and a cylindrical portion 119 other than this, as shown in FIGS. 6 (a) and (b). Thus, the drawer body 102 is positioned with respect to the apparatus main body 101 by fitting the portions 119 other than the tapered tip 118 of each positioning pin into the positioning holes 112 and 113. At this time, as shown in FIGS. 6A and 6B, a stepped portion 150 having a diameter larger than that of the columnar portion 119 is provided at the base end portion of each positioning pin 114, 115, 116, 117. As shown in FIG. 6B, the stepped portion 150 of the positioning pins 116 and 117 on the back side presses against the back side plate 131 of the device main body 101, thereby pulling the drawer body against the device main body 101. Positioning in the front-rear direction of 102, that is, in the direction in which the drawer body 102 is pulled out or pushed in, is performed.

  The positioning pins 114, 115, 116, 117 and the positioning holes 112, 113, 151 can be provided in either the apparatus main body 101 or the drawer body 102.

  By the way, when a large number of devices are mounted on the drawer body 102, the total weight thereof increases. For this reason, when pulling out the drawer body, a large force is required when the drawer body is started to be pulled out, and the operability may be reduced. When the drawer body is set in the main body of the device, the positioning pin and the positioning hole are fitted so that the drawer body is positioned. Since a large sliding resistance is generated between the hole and the hole, a particularly large force is required to pull out the drawer.

  Therefore, the regulating member 120 shown in FIG. 3 is assembled to the drawer body 102 of this example so as to be movable with respect to the drawer body 102 in the front-rear directions A and B by a predetermined stroke. Moreover, the restricting member 120 is assembled to the drawer body 102 so as to be rotatable around its central axis. The illustrated regulating member 120 includes a regulating rod 121 extending through the front plate 103 and the rear plate 104 of the drawer body 102, and a pressurizing unit 123 configured by a disc 122 fixed to the regulating rod 121. ing. An operation lever 124 is fixed to the end of the restriction rod on the front side of the front plate 103, and a positioning lock comprising a roller 125 is provided on the end of the restriction rod on the back side of the rear plate 104 as shown in FIG. A member is provided.

  FIG. 7 shows a state in which the drawer body 102 is loaded at a predetermined position in the apparatus main body 101 as in FIG. As shown in these drawings, the drawer body 102 is provided with a booster 126. This booster is a device that can move the drawer body 102 forward with a small force when the drawer body 102 starts to be pulled out. The booster 126 shown as an example in the figure includes a first link 128 coupled to the bottom plate 107 of the drawer body 102 via a first pivot pin 127 so as to be rotatable in the directions of arrows C and D, and one end side 129A. Has a second link 129 that is pivotally connected to the first link 128 via a second pivot pin 130, and the second link 129 is disposed behind the drawer body 102. The other end 129B passes through a hole formed in the side plate 104 and extends in the back direction, and the other end 129B is in contact with the back side portion of the apparatus main body 101, in the illustrated example, the back side plate 131 of the apparatus main body 101.

  A roller 125, which is an example of a positioning lock member provided on the back side portion of the regulating member 120, cooperates with a cam provided on the back side plate 131 of the apparatus main body 101 to move the drawer body 102 to the apparatus main body 101. The positioning and locking are performed, and the specific configuration and operation will be described later.

  In order to pull out the drawer body 102 in the forward direction, first, an operator grasps the operation lever 124 shown in FIG. 3 and rotates it in the direction of arrow E by approximately 90 °, so that a roller 125 is formed on the back side plate 131. So that it can pass through the hole 132 (see FIG. 8). Next, the operator pulls the operation lever 124 in the forward direction A, and moves the regulating member 120 in the forward direction with respect to the drawer body 102. At this time, as shown in FIG. 8, the pressurizing part 123 of the regulating member 120 pressurizes the pressurized part 133 of the first link 128, so that the first link 128 has an arrow around the first pivot pin 127. Rotate in the C direction. As a result, the second link 129 rotates around the second pivot pin 130 relative to the first link 128, but the second link 129 rotates with respect to the drawer body 102. The second link 129 moves in the back direction B because it is regulated by a hole formed in the rear side plate 104 so as not to move. For this reason, the other end 129 </ b> B on the back side of the second link 129 presses the back side plate 131 of the apparatus main body 101 in the back direction B. As a result, the second link 129 receives a reaction force in the front direction from the back side plate 131, so that the drawer body 102 moves in the front direction A. The first link 128 is pressed by the pressing portion 123 of the restricting member 120 and rotates in the direction of arrow C. Accordingly, the second link 129 rotates relative to the first link 128. Then, the second link 129 moves in the back direction B with respect to the drawer body 102, and the other end 129B of the second link 129 moves the back side plate 131 which is an example of the back side portion of the apparatus main body 101. The drawer body 102 is pressed and moved by a predetermined distance in the front direction A by the reaction at this time. By this movement, the aforementioned positioning holes 112, 113, 151 are detached from the positioning pins 114, 115, 116, 117. FIG. 8 shows the relative positional relationship between the first and second links 128 and 129, the drawer body 102, and the regulating member 120 at this time. Even if the regulating member 120 is further pulled in the front direction A from this state, the regulating member 120 is regulated by a stopper (not shown) and does not move in the near direction A with respect to the drawer 102, and the regulating member 120. And the drawer body 102 both move in the front direction A.

Here, as is apparent from FIGS. 7 and 8, the first link 128 covered by the pressure member 123 of the regulating member 120 from the rotation center O ₁ of the first link 128 with respect to the drawer body 102. when the arm length to the pressure portion 133 and _{L 1,} a first rotation center _{O 1} of the second link 129 of the link 128 relative to drawer body 102 is relatively rotated with respect to the first link 128 When the arm length to the rotation center O ₂ is L ₂ , the former arm length L ₁ is set larger than the latter arm length L ₂ . For example, L ₁ : L ₂ = 2: 1 is set. For this reason, the second link 129 pressurizes the back side plate 131 with a force larger than the force applied to the first link 128 by the pressure member 123 of the regulating member 120. A force larger than the force when the operator pulls the operation lever 124 in the front direction A is applied to the drawer body 102, and the drawer body 102 moves in the front direction A. Therefore, the operator can easily remove the positioning holes 112 and 113 from the positioning pins 114 to 117 with a small force. When L ₁ : L ₂ = 2: 1 is set, the force pulling the operation lever 124 in the front direction A is reduced to ½ of the pulling sliding resistance of the drawer body 102. If the pulling sliding resistance of the drawer body 102 is 100 N (10 kgf), the pulling force of the operating lever 124 is 50 N (5 kgf), which is half that force.

  As described above, the booster 126 is pressurized by the pressurizing portion 123 of the regulating member 120 when the regulating member 120 is moved in the front direction A with respect to the drawer 102 in order to pull out the drawer 102. And it is comprised so that the back | inner side part of the apparatus main body 101 may be pressed with force larger than the applied pressure, and the drawer body 102 may be moved to the near side A with the reaction force.

  When the operator grasps the operation lever 124 and pulls it in the front direction A, and the fitting between the positioning holes 112, 113, 151 and the positioning pins 114 to 117 is released as described above, the drawer is pulled out thereafter. Since the resistance acting on the body 102 is only the resistance acting on the slide rails 108 and 109, the drawer body 102 can be pulled out together with the regulating member 120 in the front direction A with a small force.

  Next, in order to set the drawer body 102 at a predetermined position in the apparatus main body 101, the operator grasps the operation lever 124 and presses it in the back direction B, and together with the regulating member 120, pulls the drawer body 102 in the back direction. When pushing into B begins, the first and second links 128, 129, the regulating member 120, and the drawer 102 move in the back direction B while maintaining the relative positional relationship shown in FIG. Since the resistance acting on the drawer body 102 at this time is only the resistance acting on the slide rails 108 and 109, the drawer body 102 can be pushed in with a small force.

  However, when the drawer body 102 approaches the final position and the positioning holes 112, 113, 151 and the positioning pins 114 to 117 start to be fitted to each other, a large resistance acts on the drawer body 102. The drawer 102 stops. In this state, when the regulating member 120 is further pushed in the back direction, the regulating member 120 further moves in the back direction B, and a pair of rollers 125 supported by the regulating member 120 is formed on the back side plate 131 of the apparatus main body 101. Passes through the hole 132 and occupies the position indicated by the two-dot chain line in FIG. At this time, the regulating member 120 is regulated by a stopper (not shown) and is prohibited from moving in the back direction B with respect to the drawer body 102.

  When an operator grasps the operation lever 124 and presses it in the back direction B in order to set the drawer body 102 in the apparatus main body 101, first, the operation lever 124 and the regulating member 120 are moved with respect to the drawer body 102. Then, the regulating member 120 is stopped with respect to the drawer body 102 by a stopper (not shown), and the operating lever 124 and the regulating member 120 are further pushed in the backward direction B in this state. In addition, the drawer body 102 may be configured to move integrally in the back direction B. Also in this case, when the pair of rollers 125 passes through the hole 132 formed in the back side plate 131 and occupies the position indicated by the two-dot chain line in FIG. 8, the drawer body 102 occupies the position approaching the final position. ing.

  On the other hand, as shown in FIG. 9 as viewed in the direction of the arrow IX in FIG. 8, the hole 132 formed in the back side plate 131 is composed of a circular hole 134 and a pair of cutout portions 135 communicating with the circular hole 134. When the roller 125 is passed through the hole 132 of the back side plate 131, the roller 125 passes through the notch 135 of the hole 132. Further, as shown in FIG. 10, a cam 152 having a gradually increasing cam surface 138 from the start point 136 to the end point 137 is formed in the back side plate portion around the circular hole 134 of the hole 132. ing.

  When the regulating member 120 is moved in the back direction and the roller 125 reaches the position indicated by the two-dot chain line in FIG. 8, the operator holds the operation lever 124 while holding it in the direction of arrow F in FIG. Rotate only °. The operation lever 124 is returned to the position shown in FIG. As a result, the restricting member 120 also rotates in the same direction, and each roller 125 also rotates around the central axis of the restricting member 120 in the direction indicated by the arrow F in FIG. For this reason, each roller 125 rolls each cam surface 138 from its start point 136 to its end point 137, occupies the position indicated by the two-dot chain line in FIG. As a result, the regulating member 120 moves in the back direction B together with the drawer body 102 by the height H of the cam surface 138. At this time, when the positioning holes 112, 113, 151 and the positioning pins 114 to 117 are fitted to each other and the rollers 125 reach the end point portions 137 of the cam surfaces 138, as shown in FIG. As shown, the stepped portions 150 of the positioning pins 116 and 117 on the back side press against the back side plate 131 of the apparatus main body 101, and the drawer body 102 is positioned and locked in the front-rear direction in the apparatus main body 101. The positioning holes 112, 113, 151 and the positioning pins 114 to 117 are fitted while the rollers 125 roll on the inclined cam surfaces 138. At this time, the positioning holes and the positioning pins are moved with a small operating force. Can be fitted.

  When the drawer body 102 is positioned as described above, the other end 129B of the second link 129 shown in FIG. 8 is pressurized by the back side plate 131 of the apparatus main body 101, and the second link 129 and the first link The link 128 is returned to the initial position shown in FIG.

  When pulling out the drawer body 102, as described above, the regulating member 120 is rotated in the direction of the arrow E (FIG. 3), and each roller 125 is aligned with each notch 135 of the hole 132. The restricting member 120 can be moved in the front direction A without interfering with 131.

  As described above, the apparatus having the drawer body of this example has the cam 152 provided around the hole 132 formed in the back side portion of the apparatus main body 101, and pushes the drawer body 102 in the back direction. After the positioning lock member provided on the regulating member 120 is passed through the hole 132 formed in the back side portion of the apparatus main body 101, when the regulating member 120 is rotated around its central axis, the positioning locking member is The cam surface 138 of the cam 152 is formed so that the positioning lock member and the regulating member 120 are moved in the back direction together with the drawer body 102 while being guided by the cam surface 138 of the cam 152. With this configuration, the drawer body 102 can be easily positioned at a predetermined position in the apparatus main body 101 with a small force.

  Further, in the apparatus of this example, a plurality of positioning lock members (two in the example shown in the figure) including the rollers 125 are provided, and these positioning lock members are arranged symmetrically with respect to the central axis of the regulating member 120. Therefore, the regulating member can be easily rotated, and the positioning lock member can be smoothly moved along the cam surface 138.

  Further, in the apparatus of this example, as shown in FIG. 6B, a positioning hole 151 is formed in the back side portion of the apparatus main body 101, and positioning pins 116 and 117 are provided in the back side part of the drawer body 102. When the positioning lock member is guided to the cam surface 138 of the cam 152 and reaches the end point portion 137 of the cam surface 138 and occupies the position in the innermost direction, the stepped portion 150 of the positioning pins 116 and 117 is The drawer body is configured so as to be positioned in the front-rear direction by being pressed against the back side portion of the apparatus main body 101. At this time, the back side portion of the apparatus main body 101 provided with the cam 152 and the back side portion of the apparatus main body provided with the positioning hole 151 are formed of the same member, which is the back side plate 131 in the illustrated example. With this configuration, the number of parts interposed between the cam 152 and the positioning hole 151 can be minimized, and the positional accuracy of the drawer body 102 with respect to the apparatus main body 101 can be further increased.

  Further, as described above, a positioning hole can be formed in the drawer body, and a positioning pin can be provided in the apparatus main body. In this case, a positioning hole is formed in the back side portion of the drawer body, a positioning pin is provided in the back side portion of the apparatus main body, and the positioning lock member is guided by the cam surface of the cam and occupies the position in the deepest direction. When this occurs, the stepped portion of the positioning pin is pressed against the back side of the drawer, and the drawer is positioned in the front-rear direction. Also in this case, the position accuracy of the drawer body with respect to the apparatus main body can be improved by configuring the back side part of the apparatus main body provided with the cam and the back side part of the apparatus main body formed with the positioning pins with the same member. Can do.

  Further, in the apparatus having the drawer body of this example, since the positioning lock member is composed of the roller 125, the roller 125 can smoothly roll on the cam surface 138. This positioning lock member can be used as a member other than the roller. Can also be configured. For example, as shown in FIG. 12, a positioning lock member can be constituted by a sliding member 125A fixed to the regulating member, and the sliding member 125A can slide on the cam surface 138.

  In the illustrated example, the back portion of the apparatus main body 101, that is, the portion of the booster 126 that presses the back side plate 131 is the other end 129 </ b> B of the second link 129, but this other end 129 </ b> B is the drawer body 102. Since the other end 129 </ b> B presses the back side plate 131, the reaction force from the back side plate 131 is almost the same in the width direction of the drawer body 102. Added to the center. Thereby, since the rotational moment resulting from reaction force is not applied with respect to the drawer body 102, the drawer body 102 can move to the front direction A correctly, maintaining the attitude | position shown in FIG.

  Further, the regulating member 120 is assembled to the drawer body 102 so as to be rotatable around its central axis, and the pressurizing portion 123 of the regulating member 120 is constituted by the disc 122. The pressure unit 123 can pressurize the first link 128 of the booster 126 even when the regulating member 120 is in any angular position. Thereby, an operation mistake can be prevented.

  When a positioning pin is provided on one of the drawer body 102 and the apparatus body 101 and a positioning hole is formed on the other side, and the drawer body 102 is positioned at a predetermined position in the apparatus body 101, as shown in FIG. A portion 119 other than the tapered tip of the positioning pin is fitted in the positioning hole. At that time, when pulling out the drawer body 102 in the front direction A, if the positioning hole and the positioning pin are disengaged, the drawer body 102 can be pulled out in the front direction A with a small force thereafter. If the movement of the drawer body 102 in the front direction A by the booster 126 is performed until the fitting between the portion 119 other than the tapered tip portion of the positioning pin and the positioning hole is released, the drawer body 102 can be made. It can be pulled out with a small force.

  In the illustrated example, the second link 129 is configured to be pressed against the back side plate 131 of the apparatus main body 101. However, the second link 129 is omitted, and the first link 128 is directly connected to the back side plate 131. It can also comprise so that it may press.

  Further, although an image forming apparatus is shown as an apparatus having a drawer, the present invention can be applied to other appropriate apparatuses.

1 is a schematic vertical sectional view showing an example of an image forming apparatus. 1 is a perspective view of an image forming apparatus with an exterior cover removed. It is a perspective view of a drawer body. FIG. 4 is a perspective view showing a state when the drawer is loaded in the image forming apparatus main body. FIG. 4 is a perspective view showing a state when the drawer is loaded in the image forming apparatus main body. It is a figure which shows the relative positional relationship of a positioning pin and a positioning hole. It is a top view which shows the relative positional relationship of a regulating member, a booster, and a drawer body when the drawer body is positioned in an apparatus main body. It is a top view which shows the relative positional relationship of a regulating member, a booster, and a drawer body when a regulating member is pulled out in this direction. It is the enlarged view seen in the arrow IX direction of FIG. It is a perspective view which shows the cam surface provided around the hole formed in the back | inner side board. It is a perspective view of the positioning lock member comprised as a roller. It is a perspective view of the positioning lock member comprised as a sliding member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Apparatus main body 102 Pull-out body 112,113,151 Positioning hole 114,115,116,117 Positioning pin 118 Tapered front-end | tip part 119 Part 120 Regulating member 123 Pressurizing part 126 Booster 128 First link 129 Second link 132 Hole 133 Pressurized portion 138 Cam surface 152 Cam A Front direction B Back direction O ₁ , O ₂ Center of rotation L ₁ , L ₂ Arm length

Claims (8)

In the image forming apparatus having a drawer body that is pulled out toward the front of the apparatus main body or pushed in the back direction and positioned in the apparatus main body, a regulating member rotatably assembled to the drawer body, and the regulation A positioning lock member provided on the back side portion of the member, and a cam provided around a hole formed in the back side portion of the apparatus main body; When the regulating member is rotated after passing through the hole formed in the back side portion of the apparatus main body, the positioning lock member is guided to the cam surface of the cam. The cam surface of the cam is formed so that the positioning lock member and the regulating member move in the back direction together with the drawer, and the regulating member can move a predetermined stroke with respect to the drawer. And a pulling device is provided on the drawer body, and the boosting device moves the regulating member forward with respect to the drawer body in order to pull out the drawer body. It is configured to press the back side portion of the apparatus main body with a force larger than the pressure applied by the pressurizing part of the member, and to move the drawer body forward by the reaction force. A first link that is rotatably connected to the body, and a second link that is rotatably connected to one end side relative to the first link; The arm length from the center of rotation of the first link to the portion to be pressed of the first link pressed by the pressing portion of the regulating member is from the center of rotation of the first link relative to the drawer body to the first. When the two links rotate relative to the first link The first link is rotated by being pressed by the pressing portion of the restricting member, and accordingly the second link is rotated by the first link. When the second link rotates relative to the link, the second link moves in the back direction with respect to the drawer, and the other end of the second link presses the back side portion of the apparatus main body. An image forming apparatus comprising: The image forming apparatus according to claim 1, wherein a plurality of the positioning lock members are provided, and the positioning lock members are arranged symmetrically with respect to a central axis of the regulating member. A positioning hole is formed in the back side portion of the apparatus main body, a positioning pin is provided in the back side portion of the drawer body, and the positioning lock member is guided by the cam surface of the cam and occupies the position in the deepest direction. The stepped portion of the positioning pin is pressed against the back side portion of the apparatus main body, and the drawer is positioned in the front-rear direction, the back side portion of the apparatus main body provided with the cam; and The image forming apparatus according to claim 1, wherein a rear side portion of the apparatus main body in which the positioning hole is formed is the same member. A positioning hole is formed in the back side portion of the drawer body, a positioning pin is provided in the back side portion of the apparatus main body, and the positioning lock member is guided by the cam surface of the cam and occupies the position in the farthest direction. The stepped portion of the positioning pin is in pressure contact with the back side of the drawer, and the drawer is positioned in the front-rear direction, the back side of the apparatus main body provided with the cam, and The image forming apparatus according to claim 1, wherein the rear side portion of the apparatus main body on which the positioning pins are formed is the same member. The image forming apparatus according to claim 1, wherein the positioning lock member is a roller. The image forming apparatus according to claim 1, wherein a portion of the booster that presses a back side portion of the apparatus main body is located at a substantially central portion in the width direction of the drawer body. The image forming apparatus according to claim 1, wherein the pressing portion of the regulating member is configured to pressurize the booster when the regulating member is in any angular position. A positioning pin is provided on one of the drawer body and the apparatus body, and a positioning hole is formed on the other side. When the drawer body is positioned at a predetermined position in the apparatus body, other than the tapered tip portion of the positioning pin Is moved into the positioning hole, and at least until the positioning hole is disengaged from the positioning pin other than the tapered tip, the booster moves the drawer in the forward direction. The image forming apparatus according to claim 1, wherein:

Images