JP2017057037A - Image formation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable access to an operation part by inserting a hand from a side face of a device body to make a work of correcting tilt of a roller pair possible or readily be done.SOLUTION: An image formation device 100 includes: a roller holding plate 81 for pivotally supporting a front-side shaft of the roller pair 62; a tilt correcting part 80 provided in the device body 11 and having an adjustment screw 85 for displacing the roller holding plate 81 in a transportation direction of a recording sheet by receiving a rotation operation by an operator from a right-side face; and a side face door 12 provided at the right side face of the device body 11, where a head of the adjustment screw 85 is directed on a side of the side face door 12.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an image forming apparatus that conveys a sheet member between a pair of rollers.

  The image forming apparatus includes a paper transport unit that discharges a recording paper through a paper feeding unit, a printing unit, and a fixing unit. The paper transport unit includes a pair of rollers for forming a transport path with opposing guide plates and sequentially transporting the recording paper along the transport direction. The recording sheet is conveyed along the conveyance path by being conveyed while being sandwiched between the pair of rollers. Of the roller pairs, the registration roller pair detects the leading edge of the recording paper, temporarily stops transporting, and starts transporting downstream in line with the printing operation of the printing unit in the state where the leading edge is aligned. To do. Since the printing process is performed on the recording paper being transported, if the recording paper transported from the registration roller pair is tilted with respect to the proper transporting direction, the orientation of the recording paper and the print image are shifted. It will be. Therefore, conventionally, a configuration is adopted in which the alignment is adjusted so that the rotation axis of the registration roller pair is orthogonal to the intended conveyance direction.

  Patent Document 1 discloses a print queue correction mechanism that corrects the sheet conveyance inclination. This print cue correction mechanism supports a movable holder plate that pivotally supports a pair of registration rollers on the vertical side wall of the base frame on one side in the axial direction, and manually rotates a cam provided on the vertical side wall. The moving holder plate that engages with the cam receiving surface is moved up and down, that is, one shaft support portion of the registration roller pair is moved up and down to correct the inclination of the roller shaft. By performing such correction, the orientation of the recording paper is printed. Can be adapted to

JP 2009-57143 A

  In the print queue correction mechanism described in Patent Document 1, the shafts of a pair of registration rollers are arranged in a direction connecting the front surface and the back surface of the image forming apparatus. The cam and cam fixing screw for correcting the print queue have a configuration in which the operation surface is arranged toward the front side of the apparatus, while the front side of the apparatus has a frame configuration. Cannot work from the front side. Accordingly, the print queue correction operation is performed by taking out the registration roller pair to be adjusted together with the correction mechanism to the outside, adjusting it, and then loading it again. Therefore, there is a problem that workability is poor.

  SUMMARY An advantage of some aspects of the invention is to provide an image forming apparatus having a configuration in which an adjustment operation can be performed from a side surface of an apparatus main body.

  The present invention provides an image forming apparatus including a pair of rollers pivotally supported on both sides in one direction in the apparatus main body, and transporting the sheet body in a direction perpendicular to the one direction through the sheet body between the roller pairs. An open / close door provided on a side surface parallel to the one direction among the outer surfaces of the apparatus main body, and an opening / closing door provided on the apparatus main body, which receives an operation by an external force from the outside, and moves the roller pair in the sheet conveying direction. And a correction adjustment unit that performs tilting and correction. The correction adjusting unit includes a roller holding unit that pivotally supports one shaft side of the roller pair, and a support unit that is provided on the apparatus main body side and supports the roller holding unit so as to be displaceable in the conveyance direction of the sheet member. And an operation unit that receives an operation by an external force from the outside and displaces the roller holding unit in the conveyance direction of the sheet member. Moreover, the said operation part is open | released by the said opening / closing door side in the state in which the said opening / closing door was opened.

  According to the present invention, when an operator applies an external force such as a rotational force to the operation unit of the correction adjustment unit, the roller holding unit can move in the sheet conveying direction, that is, can be displaced. Then, this displacement makes it possible to correct the inclination of the roller pair. The action of external force is performed with the side doors open. Therefore, the operation part is installed so that it may be opened with the open / close door side opened. Therefore, even if the construction from the front side is difficult or impossible due to the frame construction on the front side of the apparatus main body, the operator can hold his / her hand from the side of the side door. By simply inserting the jig and accessing the external force acting surface of the operation unit in the inserted direction, the inclination can be adjusted, and the correction work can be performed easily or easily.

  The sheet body is provided with a sheet cassette on which the sheet body is stacked, and the one direction is a front-rear direction of the apparatus main body, which is a drawing direction from the sheet cassette, and a plane parallel to the one direction is If the configuration is one of the left and right sides of the main body, even if the work from the front side cannot be performed due to the need for space for loading and unloading the paper cassette in the front-rear direction, On the other hand, it is possible to correct the tilt by inserting a hand from the side.

  The operation unit locks and releases the movement of the roller holding unit in response to an operation by a direction regulating member that regulates the displacement direction of the roller holding unit in the transport direction and an external force from the outside. And a fixing member. According to this configuration, since the displacement direction is limited to the conveyance direction by the direction regulating member, the operation for the displacement becomes easy, and the inclination can be corrected by locking the fixing member with the displacement position determined. it can.

  The operation unit includes a direction regulating member that regulates a displacement direction of the roller holding unit in the transport direction, an eccentric cam that contacts the roller holding unit to perform displacement in the transport direction, and the eccentric cam. And an adjustment screw that causes a rotational force to act on the head, and the head of the adjustment screw is directed toward the door. According to this configuration, by inserting a jig or the like from the open / close door side and rotating the adjustment screw, the eccentric cam rotates and the inclination is corrected.

  Further, the roller holding portion and the support portion have a position mark on the roller holding portion on one side and a dimension mark indicating the displacement amount of the roller holding portion on the other side, and are visible from the open / close door side. It is possible to be provided. According to this configuration, referring to the positional relationship between the position mark and the dimension mark, it becomes easy to set or correct the orientation of the roller pair.

  According to the present invention, it is possible or easy to correct the inclination of the roller pair by inserting a hand from the side of the apparatus main body and allowing access to the operation unit.

1 is a configuration diagram showing an overall structure of an image forming apparatus according to the present invention. It is a front view shown with a partial cross section explaining the inclination correction structure concerning 1st Embodiment. It is a right view shown with a partial cross section explaining the inclination correction structure concerning 1st Embodiment. It is a figure explaining the inclination correction structure concerning 3rd Embodiment, (a) is a front view shown with a partial cross section, (b) is a right view shown with a partial cross section.

  As shown in FIG. 1, the image forming apparatus 100 includes an image forming unit 10, an intermediate transfer unit 20, a secondary transfer unit 31, a fixing unit 32, a paper feeding unit 40, and a transport guide unit 50 that forms a paper transport path. A roller unit 60 and a reading unit 71 are provided, and an automatic document feeder 72 is mounted on the upper portion of the apparatus main body 11. The image forming apparatus 100 performs color or monochrome image formation processing on color or monochrome image data read from the reading unit 71 or color or monochrome image data input from an external device (not shown) on a recording sheet (sheet body). Do.

  The image forming unit 10 includes the light beam scanning unit 1 and image forming units 10A to 10D (process units) for each color having the same structure. The light beam scanning unit 1 includes a semiconductor laser, and reads image data of R, G, and B pixels corresponding to a color document read by the reading unit 71 from black (K), cyan (C), magenta ( M) and yellow (Y) density data, and the surface of each photoconductive drum 2 of the image forming units 10A to 10D is axially aligned with a laser beam modulated with a duty ratio corresponding to each density data after conversion (in the axial direction). Exposure scanning is performed along the main scanning direction) to form respective electrostatic latent images. The image forming unit 10A described as a representative includes a photosensitive drum 2 as an image carrier, and includes a charger 3, a developing device 4, and a cleaner unit 5 along the rotation direction (sub-scanning direction). Yes.

  The intermediate transfer unit 20 includes an intermediate transfer belt 21, a driving roller 22, a driven roller 23, and each primary transfer roller 24, and a toner image formed on the peripheral surface of each photosensitive drum 2 is an intermediate as an image carrier. Primary transfer is performed on the surface of the transfer belt 21. The secondary transfer unit 31 secondarily transfers the toner image on the surface of the intermediate transfer belt 21 to the recording paper that has been conveyed. The fixing unit 32 heats and fixes the toner image transferred to the recording paper while being conveyed, and discharges the toner image to a paper discharge tray.

  The paper feed unit 40 includes a paper feed cassette and a manual feed tray, and feeds the selected recording paper from the corresponding paper feed cassette to the transport guide unit 50. By pulling out the paper feed cassette on which the paper is loaded in the Y direction in FIG. 1, the paper can be supplied to the paper feed cassette. The conveyance guide unit 50 includes a double-sided guide plate that is opposed and disposed as is well known. The conveyance guide unit 50 constitutes a conveyance path from the paper feeding position of the paper feeding unit 40 to the discharge position through the transfer position and the fixing position, and a switchback path.

  The transport roller unit 60 includes a pair of parallel rollers that are exposed from each other at a predetermined position along the transport direction of the transport guide unit 50 and are partially exposed from the double-sided guide plate. The transport roller unit 60 constitutes a pair of rollers 61 and 62 for transporting a fed recording sheet, a pair of discharge rollers, and a pair of rollers of a switchback unit. On the right side surface of the apparatus main body 11, there is a side door 12 that rotates around the hinge 12 a on the lower end side to open and close the side surface of the apparatus main body 11. On the inner surface of the side door 12, a guide constituting the switchback path and an appropriate number of roller pairs are disposed. In a state in which the side door 12 is opened (for example, horizontal), the roller pair 62 is exposed from the right side, and the structure becomes visible and accessible.

  The roller pair 62 includes a registration roller 621 and a driven roller 622. The roller pair 62 is disposed immediately before the secondary transfer unit 31 (upstream in the transport direction) and functions to adjust the orientation of the recording paper. In the drawing, the X direction indicates the left-right direction of the apparatus main body 11, the Y direction indicates the front-rear direction of the apparatus main body 11, and the Z direction indicates the conveyance direction of the recording paper at the position of the roller pair 62.

  The roller pair 62 is supported by the inclination correction unit 80. Next, the inclination correction unit 80 according to the first embodiment will be described with reference to FIGS. 2 and 3.

  The roller pair 62 is pivotally supported on both sides in the Y direction. FIG. 3 shows a support structure on the front side of the apparatus main body 11. Although not shown in the figure, the bearing on the depth side of the apparatus main body 11 has the same structure and is engaged with a drive source (motor) that drives the registration roller 621, and the recording paper is rotated by the rotation of the registration roller 621. It is sandwiched between the driven roller 622 and conveyed in the Z direction.

  The inclination correction unit 80 includes a roller holding plate 81 that holds the front end portions of the registration roller 621 and the driven roller 622, and is disposed on the front side of the apparatus body 11, for example, on one side of the structure that supports both sides of the roller pair 62 in the Y direction. Further, a side plate portion 51 which is a part of the conveyance guide portion 50 for supporting the roller holding plate 81 so as to be displaceable is included. The conveyance guide unit 50 is attached to a predetermined unit unit on the apparatus main body 11 side, for example, a process unit unit, and is assembled with the secondary transfer unit 31 and the like. The side plate portion 51 has a side surface 51a that is oriented in the right direction by partially bending the right side in the X direction. The thickness of the side surface 51a is such that a female screw can be formed.

  The roller holding plate 81 has holes 811 and 812 for pivotally supporting the shafts 621a and 622a of the registration roller 621 and the driven roller 622 via the bearing 621b (FIG. 3, the bearing of the driven roller 622 is not visible). Yes. The holes 811 and 812 are formed at a predetermined distance so that the axially supported registration roller 621 and the driven roller 622 are parallel to each other and are in pressure contact with each other.

  A part of the right end of the roller holding plate 81 (FIG. 2) is bent in the Y direction to form a bent portion 82 having a required width. As shown in FIG. 3, the bent portion 82 has a width dimension corresponding to the width of the side surface 51 a of the side plate portion 51, and is formed to face the side surface 51 a in parallel. The formation surface of the side surface 51a and the bent portion 82 is parallel to the YZ plane. Long holes 83 and 84 that are long in the Z direction are formed at predetermined positions on the main surface of the roller holding plate 81, respectively. The longitudinal dimension of the long holes 83 and 84 corresponds to an adjustment dimension at the time of inclination correction described later. The inclination correction operation will be described later.

  On the other hand, the side plate portion 51 is formed with a window 52 indicated by a broken line that passes through the shafts 621 a and 622 a of the registration roller 621 and the driven roller 622. In addition, columnar regulation pins 53 and 54 are erected on the side plate portion 51 on the front side facing the roller holding plate 81 and at positions corresponding to the long holes 83 and 84. The long holes 83 and 84 are fitted to the restricting pins 53 and 54, thereby restricting the moving range of the roller holding plate 81 in the Z direction and the width dimension of the window 52 in the Z direction. .

  An operation lever 91 extending to the right side of the apparatus main body 11 in the X direction is attached to the shaft 621a of the registration roller 621 via an inner one-way clutch 92 such as an E-ring of a retaining jig. The operation lever 91 feeds the jammed recording paper in one direction by the action of the one-way clutch 92 by reciprocatingly swinging the operation lever 91 around the roller axis when a paper jam occurs in the roller pair 62. Thus, the roller pair 62 is removed from the clamping state. The operation lever 91 and the one-way clutch 92 may be attached to a roller disposed on the right side of the rollers of the roller pair 62 in consideration of an operation from the right side.

  The bent portion 82 is provided with a long hole 821 having a long dimension in the Z direction on one side in the vertical direction, for example, on the upper side, and a long window 86 having a long dimension in the Z direction on the lower side. A mark 87 is written next to the mark 87.

  A female screw hole 55 is formed on the side surface 51 a of the side plate portion 51 at a position facing the long hole 821. An adjustment screw 85 (operation unit) such as a stepped screw is screwed into the female screw hole 55 through a long hole 821. Therefore, the adjustment screw 85 is screwed into the female screw hole 55 of the side surface 51a by the mounting operation from the right direction. The roller holding plate 81 is fastened to the side plate portion 51 by screwing the adjustment screw 85. The fastening position between the roller holding plate 81 and the side plate portion 51 can be set by moving and adjusting the roller holding plate 81 in the Z direction.

  Further, a plurality of marks 87 on the side of the long window 86 are indicated by gauges (dimension marks) indicating dimensions in the Z direction. On the other hand, a reference mark 56 such as a half punch is visibly attached to a position of the side surface 51a facing the long window 86. The reference mark 56 is a position mark, and is a position that is exposed from the long window 86 and corresponds to the central gauge line of the mark 87 in a state where the axis of the roller pair 62 is set in the correct direction in the process unit section. Is set in advance so that The upper line from the center gauge line indicates the amount of tilt adjustment (displacement amount of the roller holding plate 81) upward (downward in the Z direction), and the lower line indicates the downward tilt (upstream in the Z direction). The adjustment amount (the displacement amount of the roller holding plate 81) is shown. By referring to the positional relationship between the reference mark 56 and the mark 87, the direction setting or correction operation of the roller pair 62 can be easily performed. As long as the displacement amount can be recognized, the reference mark 56 and the mark 87 may be provided on the opposite member side.

  Next, an operation for correcting the inclination of the roller pair 62 will be described. The correction operation is performed when the recording paper and the print image are inclined. First, the side door 12 is opened. When the side door 12 is opened, the adjustment screw 85 is opened to the door 12 side. Next, the current positional relationship between the reference mark 56 and the mark 87 is recognized, a hand is inserted from the right side to support or grip the front side of the roller pair 62, and in that state, a jig such as a driver is also inserted. To fit the insertion groove on the head of the adjustment screw 85, and rotate to loosen. Then, a new positional relationship between the reference mark 56 and the mark 87 is predicted from the inclination of the printed image, the roller holding plate 81 is moved in the Z direction by the expected amount, and the adjustment screw 85 is tightened. In this state, the side door 12 is closed and test printing is performed. The inclination between the recording paper and the printed image is inspected, and if the inclination is not corrected, the same operation is repeated. The correction operation ends when the inclination is corrected.

  As described above, since the bent portion 82 and the side surface 51a are directed to the right and the head (operation part) of the adjustment screw 85 to be operated is directed to the right, a hand or a jig is inserted as it is from the right side of the apparatus main body 11. Therefore, the correction operation can be performed simply by opening the side door 12, and the operation is also easy.

Second Embodiment
In the above embodiment, a jig such as a screwdriver is inserted and the adjustment screw 85 is rotated while the roller pair 62 is supported by hand. Instead, the lever portion of the operation lever 91 is shown in FIG. 2, by arranging on the right side as shown in FIG. 3, as a second embodiment, the lever portion of the operation lever 91 may be used as a support for the correction operation. According to this, it is not necessary to insert a supporting finger deeper, and the correction operation becomes easier.

<Third Embodiment>
In the first and second embodiments, it is necessary to manually move the roller holding plate 81 in the Z direction and tighten the adjusting screw 85. Instead, the third embodiment shown in FIG. As described above, the correction operation may be performed with only one operation.

  In FIG. 4, a roller holding plate 181 corresponds to the roller holding plate 81 of the first embodiment, and the front end side of the roller pair 62 is pivotally supported through a bearing 621b and the like, and further, an E ring of a retaining jig. Etc. are hung. In the third embodiment, the roller holding plate 181 has a rectangular shape, and a contact portion 1811 is formed on the lower side. The side plate portion 151 that supports the roller holding plate 181 is formed with a window 152 that passes through the roller pair 62. On the front side of the side plate portion 151, protrusion regulating portions 1531 and 1532 that are in sliding contact with both sides of the roller holding plate 181 are formed. By the restriction portions 1531 and 1532, the movement range of the roller holding plate 181 is restricted along with the movement direction in the Z direction and the width dimension of the window 152 in the Z direction. The structure for regulating the adjustment direction may be the same as in the first embodiment.

  The side plate portion 151 is provided with an eccentric cam 155 that is in contact with the lower surface of the contact portion 1811 of the roller holding plate 181 and is rotatable around the shaft 154. The eccentric cam 155 is provided with an action piece 156 extending in the radial direction, and an adjustment screw 157 as an action portion for applying an external force in the circumferential direction to the action piece 156 is screwed.

  A bent portion 151 a is formed on the right end surface of the side plate portion 151. The adjustment screw 157 is screwed into a female screw hole screwed into the bent portion 151a. When the action piece 156 is moved in the insertion / removal direction according to the amount of rotation of the adjustment screw 157 by a tool such as a driver, the eccentric cam 155 rotates while receiving the biasing force in the counterclockwise direction of the spring 158, and the eccentricity thereof. The roller holding plate 181, that is, the roller pair 62 is moved and adjusted in the Z direction according to the dimension. And inclination is corrected by trying similarly to 1st Embodiment. As described above, in the third embodiment, the correction part is operated simply by turning the operation part of the adjustment screw 157 to the right and inserting the jig as it is from the right side of the apparatus main body 11 and performing the rotation operation. Further, the mark 87 and the reference mark 56 can be similarly adopted in the third embodiment.

  In the first to third embodiments, the correction work is performed by inserting the hand and turning the adjustment screw. However, instead of the rotation operation, the correction operation is performed or the insertion of the hand. A mode in which the amount of inclination correction is set according to the amount of movement in a direction orthogonal to the direction may be used. Even with such an operation, it is possible to apply an external force while maintaining the insertion direction of the hand.

  In addition, the description of the above-described embodiment is an example in all respects, and should be considered not restrictive. The scope of the present invention is shown not by the above embodiments but by the claims. Furthermore, the scope of the present invention is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

100 Image forming device 11 Device body 12 Side door
62 Roller pair 51, 151 Side plate part (support part, part of correction adjustment part)
53, 54 Restriction pin (part of direction restriction member)
55 Female screw hole (part of straightening adjustment part)
56 Reference mark (position mark)
80 Inclination correction part (part of correction adjustment part)
81,181 Roller holding plate (Roller holding part, part of correction adjustment part)
83,84 Long hole (part of direction regulating member)
85,157 Adjustment screw (operation unit)
87 mark (dimension mark)
1531, 1532 Restriction part (direction restriction member)
155 Eccentric cam

Claims (5)

In the apparatus main body, the image forming apparatus includes a pair of rollers pivotally supported on both sides in one direction, and passes the sheet body between the pair of rollers to convey the sheet body in a direction perpendicular to the one direction.
An open / close door provided on a side surface parallel to the one direction of the outer surface of the apparatus body;
A correction adjustment unit that is provided in the apparatus main body and receives an operation by an external force from the outside and performs correction by inclining the roller pair in the conveyance direction of the sheet body,
The correction adjustment unit
A roller holding portion that pivotally supports one shaft side of the roller pair;
A support portion provided on the apparatus main body side, and supporting the roller holding portion so as to be displaceable in the conveying direction of the sheet body;
An operation unit that receives an operation by an external force from the outside and displaces the roller holding unit in the sheet conveying direction;
The image forming apparatus, wherein the operation unit is opened to the door side in a state where the door is opened. A sheet feeding cassette on which the sheet bodies are stacked;
The one direction is a front-rear direction of the apparatus main body, which is a drawing direction from the paper feed cassette, and a plane parallel to the one direction is one of the left and right sides of the apparatus main body. The image forming apparatus according to claim 1. The operation unit includes a direction regulating member that regulates a displacement direction of the roller holding unit in the transport direction, and a fixing member that receives and operates the external force from the outside to lock and release the roller holding unit. The image forming apparatus according to claim 1, further comprising: The operation unit is a direction regulating member that regulates the displacement direction of the roller holding unit in the conveyance direction, an eccentric cam that contacts the roller holding unit to perform displacement in the conveyance direction, and rotates to the eccentric cam. The image forming apparatus according to claim 1, further comprising: an adjustment screw that applies force, wherein a head of the adjustment screw is directed toward the opening / closing door. The roller holding part and the support part have a position mark of the roller holding part on one side and a dimension mark indicating the amount of displacement of the roller holding part on the other side, and are visible from the opening / closing door side. The image forming apparatus according to claim 1, wherein the image forming apparatus is provided.

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