JP2014228098A - Fastening device for drive unit, sheet conveyance device, and image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fastening device that has a large degree of freedom in a vibration suppression direction, whose vibration control performance is not affected by a crushing state of an elastic body etc., and in which the number of components can be reduced, and to provide a sheet conveyance device and an image forming apparatus.SOLUTION: A vibration control part 154 has an elastic body 134 and a stepped screw 135 which is inserted into the elastic body 134 and where a male screw part 135c, a shaft part 135 having a larger diameter than the male screw part, and a head part 135a having a larger diameter than the shaft part are formed in order, and also has an opening part 138 on a motor holding plate 132 and a female screw hole 133a which can be opposed to the opening part 138 on a housing 133. The elastic body 134 has a first region R1 and a second region R2 around the shaft part 135b while the stepped screw 135 inserted into the elastic body 134 fitted in the opening part 138 and received by the housing 133 is screwed into the female screw hole 133a. The first area R1 is an area formed within a range of the diameter of the head part 135a having the smaller diameter than the opening part 138 and the second area R2 is an area outside the first area R1.

Description

  The present invention relates to a driving unit fastening device that fastens a support member in a state where vibration of a driving source is suppressed, a sheet conveying device including the fastening device, and an image forming apparatus including the sheet conveying device.

  In recent years, in image forming apparatuses such as copying machines, printers, and facsimiles, a printing system in which a sheet processing apparatus that performs various sheet processing such as alignment processing and binding processing on an image formed sheet is connected to the downstream side has been widely adopted. ing.

  In such a printing system, in order to gain processing time for performing sheet bundle processing such as binding processing on a sheet that has been image-formed and conveyed, conveyance control such as acceleration / deceleration of a motor that drives a conveyance roller is performed. Yes. Such a motor is fixed to the housing of the sheet processing apparatus. However, vibrations when the motor is driven may resonate the housing, resulting in annoying noise.

  As a device for suppressing such vibration, a device is known that fastens a housing and an external housing by screwing a support damper sandwiched between the housing and the external housing (see Patent Document 1). In this device, the vibration is prevented from being transmitted from the housing to the external housing due to the vibration-proofing effect of the support damper.

  Also, with the seal member sandwiched between the motor that is the source of vibration and the holding member, the mounting screw inserted from the motor side is screwed into the nut embedded in the vibration isolating member inserted into the insertion hole of the holding member And the apparatus which fastens a motor to a holding member is known (refer to patent documents 2). In this device, the vibration of the motor is not transmitted to the holding member side due to the vibration-proofing effect of the seal member and the vibration-proofing member.

JP 11-270625 A JP 2008-262065 A

  However, in the technique described in Patent Document 1, the degree of collapse of the support damper between the housing and the external housing changes due to the screw tightening, so that the hardness of the support damper varies and the vibration prevention performance varies. Therefore, process management such as performing fastening force management was necessary.

  In the technique described in Patent Document 2, a seal member is separately required between the motor and the holding member, and a large-diameter insertion hole into which the vibration isolating member can be inserted in a substantially free state is necessary. As a result, the number of parts increases, and the vibration isolating member may move in the large-diameter insertion hole, resulting in an unstable fastening state.

  The present invention has a drive unit fastening device having a large degree of freedom in a vibration suppression direction and capable of reducing the number of parts without being affected by vibration-proof performance due to the crushing condition of an elastic body or the like, and a sheet conveying device provided with the fastening device And an image forming apparatus including the sheet conveying device.

  In the fastening device for a drive unit, the present invention provides a first support member that supports a drive source, a second support member that can support the first support member in a state of being opposed to the first support member, and the first An anti-vibration means interposed between the support member and the second support member to suppress transmission of vibration between the two support members by the drive source, and the anti-vibration means includes an elastic body, The first member includes a stepped screw that is inserted through the elastic body and has a screw portion, a shaft portion having a larger diameter than the screw portion, and a head portion having a larger diameter than the shaft portion. And one of the second support members has an opening, and the other has a female screw hole that can face the opening, and the elastic body is fitted in the opening and is received by the other support member. The stepped screw inserted through the elastic body was screwed into the female screw hole. In this state, a first region formed within a range of the diameter of the head of the stepped screw having a smaller diameter than the opening, around the shaft portion of the stepped screw, and a first region deviated from the first region And two regions.

  According to the present invention, the elastic body has a first region formed in the range of the diameter of the head of the stepped screw having a smaller diameter than the opening, and a second region deviated from the first region. ing. Therefore, the degree of freedom in the direction of exerting the elastic force of the elastic body (vibration suppression direction) is increased, and the vibration-proof performance is not affected by the collapse of the elastic body, and the number of parts can be reduced. Can be obtained.

1 is a cross-sectional view showing an image forming apparatus provided with a finisher according to the present invention. FIG. 2 is a control block diagram illustrating a control system of the image forming apparatus according to the embodiment of the present invention. Sectional drawing which shows the finisher in this embodiment. The control block diagram which shows the control system of the finisher in this embodiment. The top view which shows the structure of the motor attachment in this embodiment. The side view which shows the structure of the motor attachment in this embodiment. FIG. 2 is a plan sectional view showing a configuration of motor attachment in the present embodiment. It is explanatory drawing of the component which concerns on the vibration proof in this embodiment, (a) is a perspective view of an elastic body, (b) is a front view of an elastic body, (c) is a perspective view of a motor holding plate. FIG. 6 is an operation flowchart of the finisher in the present embodiment.

  Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. First, an image forming apparatus to which the present invention is applied will be described with reference to FIG. FIG. 1 is a cross-sectional view showing an image forming apparatus provided with a finisher as viewed from the front side of the apparatus.

[Image forming apparatus]
As shown in FIG. 1, an image forming apparatus 600 includes an image forming apparatus main body (hereinafter referred to as an apparatus main body) 600a capable of selectively performing monochrome image formation and color image formation, and sheet processing connected to the apparatus main body 600a. And a bookbinding apparatus (finisher) 100 as an apparatus. For this reason, the sheet S discharged from the apparatus main body 600a can be processed by the finisher 100 connected online. A document feeder 650 and an operation unit 601 are arranged on the upper part of the apparatus main body 600a.

  The apparatus main body 600a is configured to be used alone without connecting the finisher 100 to the discharge port. Further, the apparatus main body 600a may be integrated with the finisher 100 as a sheet discharge apparatus. Here, the position where the user faces the operation unit 601 for performing various inputs / settings on the apparatus main body 600a is referred to as the front front side (hereinafter referred to as the front side) of the image forming apparatus 600, and the rear side of the apparatus is referred to as the back side. . The finisher 100 is connected to a side portion of the apparatus main body 600a.

  Paper feed cassettes 909a and 909b are arranged at the lower part in the apparatus main body 600a. Four-color toner images are transferred to the sheets S fed from the paper feed cassettes 909a and 909b by the yellow, magenta, cyan, and black photosensitive drums 914a to 914d that constitute the image forming unit, respectively. Further, the sheet S is conveyed to the fixing device 904 to fix the toner image, and is discharged from the discharge roller pair 907 to the outside of the apparatus main body as it is in the single-sided image forming mode.

  On the other hand, in the double-sided image forming mode, the sheet S is transferred from the fixing device 904 to the reverse roller 905, and when the rear end in the transport direction exceeds the reverse switching member P, the reverse roller 905 rotates reversely and is transported. It is conveyed in the direction of the double-sided conveyance rollers 906a to 906f opposite to the direction. Then, the toner image of four colors is transferred to the sheet S again by the yellow, magenta, cyan, and black photosensitive drums 914a to 914d. The sheet S transferred on both sides is conveyed again to the fixing device 904 to fix the toner image, and is discharged from the pair of discharge rollers 907 to the outside of the apparatus main body.

[Control system]
Next, a control system for controlling the image forming apparatus 600 of the present embodiment will be described with reference to FIG. FIG. 2 is a control block diagram showing a control system of the image forming apparatus 600 in this embodiment.

  That is, the image forming apparatus 600 is provided with a CPU circuit unit 630 having the CPU 629, the ROM 631, and the RAM 655 shown in FIG. The CPU circuit unit 630 controls the document feeder control unit 632, the image reader control unit 633, the image signal control unit 634, the printer control unit 635, the finisher control unit 636, and the external interface 637. The CPU circuit unit 630 controls each of the above units according to the program stored in the ROM 631 and the setting of the operation unit 601.

  The document feeder controller 632 controls the document feeder 650 disposed on the upper part of the apparatus main body 600a. The image reader control unit 633 controls an image reader (not shown). The printer control unit 635 controls various operations in the apparatus main body 600a. The finisher control unit 636 controls various operations in the finisher 100.

  In the present embodiment, a configuration in which the finisher control unit 636 is mounted on the finisher 100 will be described, but the present invention is not limited to this. That is, the finisher control unit 636 may be provided integrally with the CPU circuit unit 630 in the apparatus main body 600a, and the finisher 100 may be controlled from the apparatus main body 600a side.

  The RAM 655 is used as an area for temporarily storing control data and a work area for calculations associated with control. An external interface 637 is an interface from a computer (PC) 620, which develops print data into an image and outputs the image to the image signal control unit 634. An image read by the image sensor is output from the image reader control unit 633 to the image signal control unit 634, and an image output from the image signal control unit 634 to the printer control unit 635 is input to an exposure control unit (not shown). Is done.

  The finisher control unit 636 is mounted on the finisher 100 and performs drive control of the entire finisher by exchanging information with the CPU circuit unit 630 of the apparatus main body 600a. The finisher control unit 636 controls various motors and sensors.

  That is, as shown in FIG. 4, the finisher control unit 636 includes a microcomputer (CPU) 701, a RAM 702, a ROM 703, a communication interface 706, a network interface 704, and an input / output unit (I / O) 705.

  Various sensor signals such as the inlet sensor 101, the return paddle HP sensor 117a, and the sheet surface detection sensor 118 are input to the input port of the I / O 705.

  Each drive system such as a conveyance motor M1 as a drive source connected via various drivers is connected to the output port of the I / O 705. That is, the output port of the I / O 705 includes a transport motor M1, a processing support plate drive motor M2, a return paddle drive motor M3, a front alignment plate drive motor M4, a rear alignment plate drive motor M5, a clinch motor M6, and a push-out claw drive motor M7. The stacking tray drive motor M8 is connected.

[Finisher]
Next, the configuration of the finisher 100 will be described with reference to FIG. FIG. 3 is a cross-sectional view showing the finisher 100 in the present embodiment.

  As shown in FIG. 3, the finisher 100 sequentially takes in the sheets discharged from the apparatus main body 600a, sorts the received sheets in the width direction, aligns the plurality of taken-in sheets, and aligns the rear ends of the sheet bundle. A flat binding process for binding the parts is performed. The finisher 100 includes a conveyance path 115 as a sheet conveyance path from when a sheet from the apparatus main body 600 a is taken into the apparatus to when the sheet is discharged to the stacking tray 116, an inlet sensor 101, a conveyance roller 102, and a processing tray 104. doing.

  The sheet processing in the finisher 100 is performed in accordance with a user setting by the operation unit 601 provided in the apparatus main body 600a. That is, the conveyance roller 102 is a roller that conveys a received sheet and discharges it to the processing tray 104, and is driven by a conveyance motor M1 (see FIG. 4).

  The processing support plate 119 is driven by the processing support plate driving motor M2, and when the sheet is discharged to the processing tray 104, the processing support plate 119 protrudes as indicated by a broken line in FIG. This supports the leading edge of the sheet so that it does not hang down on the stacking tray 116. Further, the processing support plate 119 also plays a role of greatly extending the processing tray 104 surface. When the sheet bundle is discharged to the stacking tray 116, the position returns to the solid line in FIG.

  The return paddle 117 and the rear end paddle 103 are rotationally driven so that the rear end of the sheet discharged to the processing tray 104 abuts against the rear end wall 105, and performs alignment in the sheet conveyance direction. The return paddle 117 stands by at a home position (position shown in FIG. 3) that does not impair sheet conveyance based on detection of the return paddle HP (home position) sensor 117a (see FIG. 4). As a result, the return paddle 117 is driven once by the return paddle drive motor M3 with timing based on the detection of the inlet sensor 101.

  The trailing edge paddle 103 is connected to the conveying roller 102 via a timing belt (not shown) and is configured to rotate in the same direction as the conveying roller 102, so that the sheet is formed on the trailing edge wall 105 on the processing tray 104. Rotate in the direction of conveying. The return paddle 117 and the rear end paddle 103 are both made of an elastic body, and convey the sheet while being bent.

  The front alignment plate 106 and the rear alignment plate 107 align sheets on the processing tray 104 in a direction (sheet width direction) orthogonal to the sheet conveyance direction. It is driven in the sheet width direction by a plate drive motor M5.

  The stapler 120 is driven by a clinch motor M6 and staples a bundle of sheets stacked and stacked on the processing tray 104. The pushing claw 114 is driven by the pushing claw drive motor M7, and the sheet trailing edge can be reciprocated in the direction of arrow A in FIG. 3 in order to stack the sheet bundle on the processing tray 104 on the stacking tray 116. The stacking tray 116 is driven by the stacking tray drive motor M8 and moves up and down so as to have the sheet surface height detected by the sheet surface detection sensor 118.

  Here, the configuration of the drive unit 151 having the above-described transport motor M1, transport roller 102, and the like will be described with reference to FIG. FIG. 5 is a plan view showing the configuration of motor attachment in the present embodiment.

  That is, as shown in FIG. 5, the transport motor M <b> 1 held by the motor holding plate 132 has a vibration isolating portion 154 as an anti-vibration means having an elastic body 134 and a stepped screw 135 on the housing 133 of the finisher 100. Is supported through. The vibration isolator 154 is interposed between the motor holding plate 132 and the housing 133 (between both supporting members), and suppresses transmission of vibration between the motor holding plate 132 and the housing 133 by the transport motor M1.

  The motor holding plate 132 constitutes a first support member that supports the transport motor M1 as a drive source. The housing 133 constitutes a second support member that can support the motor holding plate 132 in a state of facing the motor holding plate 132 as the first support member.

  A conveyance roller 102 is supported on the housing 133 via a bearing 136. The conveying roller 102 has a driving pulley 144 and roller bodies 102b and 102b attached to a rotating shaft 102a supported by a bearing 136 in order from the housing 133 side. The other bearing 136 is attached to the lower side of FIG. 5 in the rotating shaft 102a. As a result, both ends of the transport roller 102 are supported by the housing 133 (the opposite side is not shown) by the bearings 136 and 136.

  The motor shaft pulley 141 fixed to the motor shaft 140 of the transport motor M1 includes an opening 150 (see FIG. 8C) formed in the motor holding plate 132 and an opening 153 formed in the housing 133 (FIG. 7). (See below). The rotation shaft 145 of the idler step pulley 142, the rotation shaft 146 of the idler step pulley 143, and the rotation shaft 102a of the transport roller 102 are attached so as to protrude in parallel from each corresponding position of the housing 133.

  A timing belt 147 is wound between the motor shaft pulley 141 and the idler pulley 142, and a timing belt 148 is wound between the idler pulley 142 and the idler pulley 143. A timing belt 149 is wound around the idler pulley 143 and the drive pulley 144. Thus, a drive train 152 that transmits the rotation of the transport motor M1 to the transport roller 102 is configured.

  With the above configuration, when the transport motor M1 is rotationally driven, the rotation is transmitted from the motor shaft pulley 141 to the transport roller 102 via the timing belts 147, 148, and 149.

  Further, the transport motor M1 is supported by the housing 133 in the drive train direction via two vibration isolators (anti-vibration means) 154 and 154 that sandwich the motor M1. This prevents the motor shaft 140 from being tilted more than necessary due to the tension of the timing belts 147, 148, and 149 when the motor is driven, and the distance between the axes of the drive train 152 is guaranteed.

  In the present embodiment, the sheet conveying apparatus is configured by the fastening device 155 and the conveying roller 102 that is rotated by the conveying motor (drive source) M1 and conveys the sheet. In other words, the image forming apparatus 600 of the present embodiment includes an image forming unit including yellow, magenta, cyan, and black photosensitive drums 914a to 914d and the sheet conveying apparatus that conveys the sheet S on which the image is formed. Yes.

[Description of Finisher 100 Operation]
Next, the operation in the staple mode including the sheet alignment process of the finisher 100 including the fastening device 155 of the driving unit 151 described above will be described with reference to the flowchart of FIG.

  That is, when the staple mode is selected by the operation unit 601 (step S1), the finisher control unit 636 starts printing after the initial operation (step S2) (step S3). Then, the transport motor M1 of the finisher 100 is driven (step S4), and when the sheet S is delivered from the apparatus main body 600a to the finisher 100, the inlet sensor 101 is turned on (step S5).

  When the sheet S is the first sheet in the bundle (step S6), the processing support plate 119 protrudes due to normal rotation of the processing support plate drive motor M2 (step S7). Further, the finisher control unit 636 drives the return paddle drive motor M3 after a predetermined time has elapsed from the inlet sensor 101 (step S8), and causes the rear alignment plate drive motor M5 to rotate forward to operate the rear alignment plate 107 (step S8). S9), width alignment is performed by the rear alignment plate 107. Thereafter, in step S10, it is determined whether or not it is the final sheet in the bundle.

  As a result, when it is determined that the sheet is not the final sheet in the bundle, the rear alignment plate 107 is retracted, and the next sheet can be received. Then, the rear alignment plate drive motor M5 is rotated in the reverse direction (step S11), the return paddle 117 is rotated once, the sheet is abutted against the rear end wall 105 and the conveyance direction alignment is performed, and then the processing from step S5 is repeated.

  On the other hand, when it is determined in step S10 that the sheet is the final sheet in the bundle, the finisher control unit 636 stops (OFF) the conveyance motor M1 and stops the conveyance roller 102 and the trailing edge paddle 103 (step S12). . In step S13, the clinch motor M6 is driven to staple the sheet bundle with the stapler 120. In step S14, the rear alignment plate drive motor M5 is reversely rotated to retract the rear alignment plate 107, and in step S15, the push-out claw drive motor M7 is turned on to advance and retract the push-out claw 114. Further, in step S16, the processing support plate drive motor M2 is reversed, the processing support plate 119 is retracted, and the sheet bundle is discharged onto the stacking tray 116.

  Subsequently, when the sheet surface detection sensor 118 is turned on by the discharged sheet bundle (step S17), the finisher control unit 636 drives the stacking tray drive motor M8 (step S18) to lower the stacking tray 116. Then, when the sheet surface detection sensor 118 is turned off, the lowering of the stacking tray 116 is stopped and the height of the stacked sheet surface is determined (steps S19 and S20).

  Subsequently, in step S21, the finisher control unit 636 determines whether or not the discharged sheet bundle is the final bundle. As a result, when it is determined that the bundle is not the final bundle, the processing from step S4 is repeated, and the conveyance motor M1 is driven so that the next sheet can be received. On the other hand, if it is determined in step S21 that the bundle is the final bundle, JOB is ended (completed).

  Next, the fastening device 155 and the like of the drive unit 151 in this embodiment will be described in detail with reference to FIG. 6, FIG. 7, and FIG. 6 is a diagram showing the finisher 100 as viewed from the back side (back side) of the apparatus in FIG.

  As shown in FIG. 6, the transport motor M <b> 1 is fixed to the motor holding plate 132 by two screws (screws) 131. The motor holding plate 132 has a transport motor M1 supported at a substantially central portion in the extending direction (left-right direction in FIG. 6). Openings 138 are formed at both ends of the conveyance motor M1 in the extending direction of the motor holding plate 132, respectively.

  Here, as shown in FIGS. 8A and 8B, the elastic body 134 is formed in a cylindrical shape, with an insertion hole 137d through which the shaft portion 135b of the stepped screw 135 is inserted, and the insertion hole 137d as the center. And a flange 137a protruding in a cylindrical shape. Furthermore, the elastic body 134 is formed so as to be confined in a cylindrical shape between the large-diameter portion 137c formed on the lower side from the cylindrical flange portion 137a and the flange portion 137a and the large-diameter portion 137c. And a cylindrical recess 137b.

  The flange portion 137a, the cylindrical concave portion 137b, and the large diameter portion 137c constitute a cylindrical portion that is fitted into the opening 138. The cylindrical recess 137b is formed on the outer periphery of the cylindrical portion so as to be inserted from the large diameter portion 138b of the opening 138 and fitted into the small diameter portion 138a, that is, to sandwich the outside of the opening 138.

  As shown in FIG. 8C, the opening 138 has a large-diameter portion 138b into which the elastic body 134 is fitted, and a small-diameter portion 138a into which the elastic body 134 is fitted while shifting from the large-diameter portion 138b. . The two small diameter portions 138 a are located on both sides in the extending direction (longitudinal direction) of the motor holding plate 132. In other words, the openings 138 and 138 and the female screw holes 133a and 133a (see FIG. 7) provided in the housing 133 corresponding to the openings 138 and 138 allow the transport motor M1 supported by the motor holding plate 132 to be connected to the motor holding plate 132. It is provided at a position sandwiched between both sides.

  Between the openings 138 at both ends of the motor holding plate 132, an attachment opening for projecting the motor shaft 140 and the motor shaft pulley 141 fixed to the motor shaft 140 when the transport motor M1 is fixed. 150 is provided.

  As shown in FIG. 7, the stepped screw 135 is inserted into the elastic body 134, and has a male screw portion (screw portion) 135c, a shaft portion 135b having a larger diameter than the male screw portion 135c, and a diameter larger than that of the shaft portion 135b. A head 135a is formed in order. That is, the stepped screw 135 includes a male screw part 135c that is screwed into the female screw hole 133a of the housing 133, a head part 135a that is rotated around the axis by a tool such as a screwdriver, and the head part 135a and the male screw part 135c. And a cylindrical shaft portion 135b formed between the two.

  As shown in FIG. 7, the outer diameter D1 of the cylindrical concave portion 137b of the elastic body 134 and the outer diameter D2 of the head portion 135a of the stepped screw 135 have a relationship of D1> D2. That is, the outer diameter D1 of the cylindrical recess 137b is formed larger than the outer diameter D2 of the head portion 135a of the stepped screw 135.

  In the vibration isolator 154 of the present embodiment, a stepped screw inserted into the elastic body 134 that is fitted into the opening 138 of the motor holding plate 132 (one support member) and received by the housing 133 (the other support member). 135 is screwed into the female screw hole 133a. In this state, a first region R1 that receives the compression force by the head portion 135a of the stepped screw 135 having a smaller diameter than the opening 138 by the shaft portion 135b and the housing 133, and a compression region by the head portion 135a (first region R1) The second region R2 that is out of the range is formed in the elastic body 134.

  In other words, the elastic body 134 is inserted into the opening 138 and the stepped screw 135 inserted through the elastic body 134 received by the housing 133 is screwed into the female screw hole 133a. A first region R1 and a second region R2 are provided around the portion 135b. The first region R1 is a region formed in a range of the diameter of the head portion 135a of the stepped screw 135 having a smaller diameter than the opening 138, and the second region R2 is a region deviated from the first region R1. It is.

  The elastic body 134 is configured such that the fastening direction length dimension L1 of the first region R1 and the fastening direction length dimension L2 of the shaft portion 135b satisfy the relationship of L1≈L2. Preferably, the fastening direction length dimension L1 of the first region R1 is configured to be larger by a predetermined amount than the fastening direction length dimension L2 of the shaft portion 135b. As described above, it is preferable that the fastening direction length dimension L2 is shorter than the fastening direction length dimension L1 by a predetermined amount in order to compress and settle the first region R1 of the elastic body 134.

  Therefore, when the motor holding plate 132 is fastened to the housing 133 via the elastic body 134 with the stepped screw 135 with the large diameter portion 137c interposed between the motor holding plate 132 and the housing 133, the motor holding plate 132 is stepped. It can be tilted in any direction around the screw 135. Therefore, the degree of freedom of vibration suppression is increased, and the elastic body 134 is not hardened by the fastening force of the stepped screw 135, so that the vibration isolation effect is enhanced.

  In the present embodiment, the vibration isolator 154 as an anti-vibration means has an elastic body 134 and a stepped screw 135 inserted through the elastic body 134, an opening 138 in the motor holding plate 132, and The housing 133 has a female screw hole 133a that can face the opening 138. Then, the male screw part 135c of the stepped screw 135 inserted through the insertion hole 137d of the elastic body 134 fitted into the small diameter part 138a of the opening 138 is screwed into the female screw hole 133a.

  As described above, according to this embodiment, the degree of freedom in the direction in which the elastic body 134 exerts the elastic force can be increased, the degree of freedom is increased in the vibration suppression direction, and the elastic body 134 is prevented from being crushed. It is possible to obtain a configuration in which the vibration performance is not affected and the number of parts can be reduced.

  That is, since the outer diameter D1 of the cylindrical recess 137b of the elastic body 134 is larger than the outer diameter D2 of the head 135a, which is the fastening force generation region of the stepped screw 135, the elastic body 134 exerts the elastic force in the direction. Great freedom. Further, since the fastening direction length dimension L1 of the elastic body 134 is only a minute amount larger than the fastening direction length dimension L2 of the shaft portion 135b, the elastic body 134 is not crushed by the fastening force. For this reason, the process management of a fastening force etc. become unnecessary.

  In the present embodiment, the opening 138 is formed in the motor holding plate 132 (one support member) and the female screw hole 133a is formed in the housing 133 (the other support member). However, this relationship may be reversed. . That is, an opening is formed in the housing 133 as the second support member, and a female screw hole is formed in the motor holding plate 132 as the first support member. Then, a stepped screw 135 is inserted into the elastic body 134 from the housing 133 side and screwed to the motor holding plate 132 side to fasten the housing 133 and the motor holding plate 132. Even in this case, the same effect as in the present embodiment can be obtained.

  In the present embodiment, the present invention has been described with reference to the conveyance motor M1 as a drive source that generates vibration. However, the same vibration preventing effect can be obtained even if the present invention is applied to a vibration source such as a fan. Of course.

  DESCRIPTION OF SYMBOLS 100 ... Finisher, 102,155 ... Sheet | seat conveyance apparatus (conveyance roller, fastening apparatus), 132 ... 1st support member (motor holding plate), 133 ... 2nd support member (casing), 133a ... Female screw hole, 134 ... Elasticity Body, 135 ... Screw with step, 135a ... Head, 135b ... Shaft part, 137a, 137b, 137c ... Cylindrical part (saddle part, cylindrical recess, large diameter part), 137d ... Insertion hole, 138 ... Opening part, 151 DESCRIPTION OF SYMBOLS ... Drive unit, 154 ... Anti-vibration means (anti-vibration part), 600 ... Image forming apparatus, D1 ... Outer diameter of cylindrical recess, D2 ... Outer diameter of head, L1 ... Length in fastening direction, L2 ... Fastening direction Length dimension, M1 ... drive source, motor (conveyance motor), R1 ... first area, R2 ... second area, S ... sheet

Claims (6)

A first support member that supports the drive source;
A second support member capable of supporting the first support member in a state of facing the first support member;
Anti-vibration means interposed between the first support member and the second support member to suppress the transmission of vibrations by the drive source between the two support members,
The vibration isolating means is
An elastic body, and a stepped screw that is inserted through the elastic body and has a screw portion, a shaft portion having a diameter larger than that of the screw portion, and a head portion having a diameter larger than that of the shaft portion. ,
One of the first and second support members has an opening, and the other has a female screw hole that can face the opening,
The elastic body is
In a state where the stepped screw inserted into the elastic body fitted into the opening and received by the other support member is screwed into the female screw hole, around the shaft portion of the stepped screw, A first region formed in a range of the diameter of the head of the stepped screw having a smaller diameter than the opening, and a second region deviating from the first region,
A drive unit fastening device characterized by that. The elastic body is
An insertion hole through which the shaft portion of the stepped screw is inserted; a cylindrical portion fitted into the opening; and a cylindrical recess formed on the outer periphery of the cylindrical portion so as to sandwich the outside of the opening. ,
The fastening device for a drive unit according to claim 1. The elastic body is formed such that a fastening direction length dimension of the first region is larger than a fastening direction length dimension of the shaft portion.
The drive unit fastening device according to claim 1, wherein the drive unit is fastened. The opening and the female screw hole are provided on both sides of the drive source supported by the first support member,
The fastening device for a drive unit according to any one of claims 1 to 3, wherein A fastening device for a drive unit according to any one of claims 1 to 4,
A sheet conveying apparatus comprising: a conveying roller that is rotated by a motor as the driving source and conveys the sheet. An image forming unit;
An image forming apparatus comprising: the sheet conveying apparatus according to claim 5 which conveys an image-formed sheet.

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