JP6768355B2 - Sheet transfer device and image forming device - Google Patents

Description

The present invention relates to a sheet transporting device for transporting sheets and an image forming apparatus including the same.

Conventionally, a sheet transfer device has been proposed in which a sheet is conveyed while correcting curl of the sheet by using a transfer roller and two driven rollers that come into contact with the transfer rollers (see Patent Document 1). These two driven rollers are held in one holder so that the axes of rotation are parallel.

On the other hand, when the sheet transfer device is arranged near the fixing device, the driven roller is tilted with respect to the transfer roller in order to prevent the semi-molten toner from adhering to the driven roller and causing an image defect. (See Patent Document 2).

JP-A-2007-145452 JP-A-2010-195544

However, as a configuration for curling correction and suppressing toner adhesion to the driven rollers, if a plurality of driven rollers are tilted with respect to the transport rollers while being kept parallel, the ends of the driven rollers come into strong contact with the transport rollers. , There is a risk of streak-shaped damage forming on the sheet.

Therefore, an object of the present invention is to provide a sheet transfer device for suppressing damage to a sheet and an image forming device provided with the sheet transfer device.

The present invention comprises a transfer roller, a first rotating body that rotates in contact with the transfer roller and forms a first nip portion that conveys the sheet in the first transfer direction together with the transfer roller. A second sheet provided downstream of the first rotating body in the rotation direction of the transfer roller and rotating in contact with the transfer roller to convey the sheet conveyed by the first nip portion in the second transfer direction. A second rotating body having two nip portions formed together with the transport roller is provided, and the rotating shaft of the first rotating body and the rotating shaft of the second rotating body are inclined with respect to the rotating shaft of the transport roller. a rotating shaft of the first rotating body, the rotation axis of said second rotary member, the Ri nonparallel der each other, the rotary shaft of the first rotating body, when viewed in the direction of the rotation axis of the conveying roller The center of one end of the first rotating body is tilted with respect to the rotation axis of the transport roller so as to be located at a position different from the center of the other end of the first rotating body in the first transport direction. The rotation axis of the second rotating body is such that the center of one end of the second rotating body is the center of the other end of the second rotating body when viewed in the direction of the rotation axis of the transport roller. 2. It is characterized in that it is tilted with respect to the rotation axis of the transport roller so as to be located at different positions in the transport direction .

According to the present invention, it is possible to suppress the action of a non-uniform force on the sheet, and to prevent the sheet from skewing or being damaged.

The whole schematic which shows the printer which concerns on 1st Embodiment. The perspective view which shows the sheet discharge part of the 1st Embodiment. The side sectional view which shows the 1st sheet transport part of 1st Embodiment. The perspective view which shows the 1st sheet transport part of 1st Embodiment. The side view for demonstrating the inclination of the 1st idler roller and the 2nd idler roller of 1st Embodiment. The perspective view for demonstrating the inclination of the 1st idler roller and the 2nd idler roller of 1st Embodiment. 5 and 6 are views from the A direction. 5 and 6 are views from the B direction. The perspective view which shows the 1st idler roller and the 2nd idler roller which concerns on 2nd Embodiment. The perspective view which shows the 1st idler roller and the 2nd idler roller which concerns on 3rd Embodiment. The perspective view which shows the 1st idler roller and the 2nd idler roller which concerns on 4th Embodiment. It is a figure which shows the holding member which concerns on 1st Embodiment, (a) is a perspective view, (b) is a front view. (A) is a figure explaining the inclination of the discharge roller, the first idler roller and the second idler roller according to the first embodiment. (B) is a perspective view showing the first idler roller. (C) is a perspective view showing a second idler roller. (A) is a figure explaining the inclination of the discharge roller, the first idler roller and the second idler roller according to the first embodiment. (B) is a perspective view showing the first idler roller. (C) is a perspective view showing a second idler roller.

<First Embodiment>
First, the first embodiment of the present invention will be described. The printer 100 (image forming apparatus) according to the first embodiment is an electrophotographic laser beam printer. As shown in FIG. 1, the printer 100 includes a feeding cassette 1 provided in the printer main body 100A so as to be insertable and retractable, an image forming unit 50 for forming an image on a sheet fed from the feeding cassette 1, and an image forming unit 50. It has a fixing portion 60 and a sheet discharging portion 70.

When the image formation command is output to the printer 100, the image formation process by the image forming unit 50 is started based on the image information input from an external computer or the like connected to the printer 100. The image forming unit 50 includes a cartridge 5 having a photoconductor drum 6 which is an image carrier, a laser scanner 8, and a transfer roller 7. The laser scanner 8 irradiates the photoconductor drum 6 with the laser beam 9 based on the input image information. At this time, the photoconductor drum 6 is precharged by a charging roller (not shown), and an electrostatic latent image is formed on the photoconductor drum 6 by being irradiated with the laser beam 9. After that, this electrostatic latent image is developed by a developing roller (not shown), and a toner image is formed on the photoconductor drum 6.

In parallel with the image forming process described above, the sheet S loaded on the feeding cassette 1 is sent out by the feeding roller 2. The sheets S are separated one by one by a separation portion (not shown). Then, the sheet S is conveyed toward the transfer roller 7 by the intermediate transfer roller 3 and the transfer idler roller 4. The transfer roller 7 (transfer unit) transfers the toner image formed on the photoconductor drum 6 to the sheet S by applying the transfer bias.

The sheet S on which the toner image is transferred by the transfer roller 7 is heated and pressurized by the fixing portion 60 composed of the heating roller 10 and the pressure roller 11, and the toner image is fixed. Then, the sheet S is discharged to the discharge tray 30 by the sheet discharge part 70 arranged downstream in the sheet transport direction of the fixing part.

Next, the sheet discharging unit 70 will be described in detail. As shown in FIG. 2, the seat discharge unit 70 rotates on the discharge upper guide 16 and the discharge lower guide 18 forming the discharge transport path 31 (see FIG. 3) and the bearings 17 and 17 press-fitted into the discharge upper guide 16. It has a drive shaft 12a that can be supported. Further, the sheet discharging section 70 includes a first sheet transport section 80A (sheet transport device) and a second sheet transport section 80B arranged side by side in the width direction orthogonal to the sheet transport direction. The first sheet transport section 80A and the second sheet transport section 80B are provided symmetrically with respect to the center line in the width direction of the discharge transport path 31, and in the present embodiment, the configuration of the first sheet transport section 80A The configuration of the second sheet transport unit 80B will be described and omitted.

As shown in FIGS. 2 to 4, the first sheet transport unit 80A includes a discharge roller 12 (convey roller) fixed to the drive shaft 12a and a first idler roller 13c (first idler roller 13c) that rotates in accordance with the discharge roller 12. 1 rotating body) and. Further, the first sheet transport unit 80A has a second idler roller 14c (second rotating body) that is arranged downstream of the first idler roller 13c in the rotation direction of the discharge roller 12 and rotates in accordance with the discharge roller 12. .. Further, the first sheet transport portion 80A extends from both ends of the first rotary shaft 13 (first shaft portion) extending from both ends of the first idler roller 13c and the second idler roller 14c in the rotation axis direction of the discharge roller 12. It has a second rotating shaft 14 (second shaft portion). Further, the first sheet transport unit 80A has a holding member 15 (holder) that rotatably supports the first rotation shaft 13 and the second rotation shaft 14.

A perspective view of the holding member 15 is shown in FIG. 12A, and the structure of the holding member 15 will be described in detail. The holding member 15 has a first side wall 15a (first support portion) and a second side wall 15b (second support portion) provided in parallel with the first side wall 15a. The first side wall 15a has support portions 1513a and 1514a that rotatably support one end portion 13a of the first rotation shaft 13 and one end portion 14a of the second rotation shaft 14 on the same side as the one end portion 13a, respectively. .. The second side wall 15b is a support portion 1513b that rotatably supports the other end portion 13b of the first rotating shaft 13 and the other end portion 14b of the second rotating shaft 14 on the same side as the other end portion 13b. It has 1514b. The virtual line L13 passing through the support portion 1513a and the support portion 1513b is non-parallel to the virtual line m14 passing through the support portion 1514a and the support portion 1514b.

FIG. 12B shows a view of the holding member 15 as viewed from a direction perpendicular to the first side wall 15a. The support portion 1513a and the support portion 1513b are provided coaxially, and the support portion 1514a and the support portion 1514b are provided non-coaxially. In other words, the support portion 1513a and the support portion 1513b are arranged at positions where the centers of the support portion 1513a and the support portion 1513b overlap each other when viewed from a direction perpendicular to the first side wall 15a, and the centers of the support portion 1514a and the support portion 1514b overlap each other. It is placed in a position where it does not become. The holding member 15 is formed so that the virtual line L13 is tilted with respect to the drive shaft 12a of the discharge roller 12.

Further, the holding member 15 is attached so as to be movable in a substantially vertical direction with respect to the discharging guide 18, and a spring 19 is reduced between the discharging guide 18 and the holding member 15. The spring 19 urges the first idler roller 13c and the second idler roller 14c to come into pressure contact with the discharge roller 12 via the holding member 15. Further, the spring 19 is arranged so that the first idler roller 13c and the second idler roller 14c pressurize the position of the discharge roller 12 substantially at the center in the axial direction.

The printer main body 100A is provided with a control unit (not shown), and the control unit drives a drive source (not shown) to rotate the drive shaft 12a. When the drive shaft 12a rotates, the discharge roller 12 fixed to the drive shaft 12a rotates, and the first idler roller 13c and the second idler roller 14c rotate in accordance with the rotation of the discharge roller 12.

Next, a more detailed arrangement of the first idler roller 13c and the second idler roller 14c will be described with reference to FIGS. 5 to 8. FIG. 5 is a side view showing the discharge roller 12, the first idler roller 13c, and the second idler roller 14c as viewed from the rotation axis L1 (rotation axis) of the discharge roller 12. FIG. 6 is a perspective view for explaining the inclination of the first idler roller 13c and the second idler roller 14c. 7 is a view seen from the direction of arrow A in FIGS. 5 and 6, and FIG. 8 is a view seen from the direction of arrow B in FIGS. 5 and 6. The direction of arrow A is the direction perpendicular to the contact surface F1 between the discharge roller 12 and the first idler roller 13c, and the direction of arrow B is perpendicular to the contact surface F2 between the discharge roller 12 and the second idler roller 14c. The direction.

As shown in FIG. 7, the first idler roller 13c is provided so that the first rotating shaft 13 is inclined with respect to the rotating axis L1 of the discharge roller 12. In other words, the rotation axis L2 (rotation axis) of the first idler roller 13c is inclined by an angle θ with respect to the rotation axis L1 of the discharge roller 12.

Further, as shown in FIG. 8, the second idler roller 14c is provided so that the second rotating shaft 14 is inclined with respect to the rotating axis L1 and the first rotating shaft 13 of the discharge roller 12. In other words, the rotation axis L3 (rotation axis) of the second idler roller 14c is inclined by an angle θ with respect to the rotation axis L1 of the discharge roller 12. In the present embodiment, the inclination angles of the rotation axes L2 and L3 with respect to the rotation axis L1 are the same at the angle θ, but may be different within a range that does not hinder the transportation of the sheet S. The inclination of the first idler roller 13c and the second idler roller 14c is set by the positions of the support portions 1513a, 1513b, 1514a, and 1514b of the holding member 15. The angle θ is preferably 1 ° or more and 3 ° or less.

Here, as shown in FIGS. 5 and 6, a plane parallel to the rotation axis L1 of the discharge roller 12 and including the contact surface F1 and the contact surface F2 is defined as the reference surface P. The first idler roller 13c and the second idler roller 14c are arranged so as to be inclined in the same direction with respect to the width direction when viewed from a direction orthogonal to the reference plane P. The one end portion 13a located upstream in the sheet transport direction of the first rotating shaft 13 is arranged at a position closer to the reference surface P than the other end portion 13b located downstream. The one end portion 14a located upstream in the sheet transport direction of the second rotating shaft 14 is arranged at a position farther from the reference surface P than the other end portion 14b located downstream.

As described above, in the present embodiment, the first idler roller 13c and the second idler roller 14c are inclined independently with respect to the discharge roller 12. As a result, the first idler roller 13c and the second idler roller 14c come into contact with the discharge roller 12 at the center position in the width direction. That is, since the first idler roller 13c and the second idler roller 14c symmetrically contact the discharge roller 12 with reference to the central position in the width direction, the sheet S can be stably conveyed. In addition, damage such as wrinkles on the sheet can be reduced. Further, it is possible to prevent the toner from sticking to the first idler roller 13c and the second idler roller 14c, and to correct the curl of the sheet.

Next, using FIGS. 13 (a), 13 (b) and 13 (c), how the first idler roller 13c and the second idler roller 14c are tilted with respect to the discharge roller 12. Will be explained in detail.

FIG. 13A is a view of the discharge roller 12, the first idler roller 13c, and the second idler roller 14c as viewed from the rotation axis direction of the discharge roller 12. In FIG. 13A, one end surface 13cF (one end) of the first idler roller 13c is represented by a solid line, and the other end surface 13cB (the other end) is represented by a broken line. The center of one end surface 13cF of the first idler roller 13c is C1, and the center of the other end surface 13cB is C1'. The sheet is conveyed by the nip portion N1 (first nip portion) formed by contacting the discharge roller 12 and the first idler roller 13c. The sheet transport direction D1 (first transport direction) of the nip portion N1 is the center (connecting C1 and C1'in the rotation axis direction of the first idler roller 13c when viewed from the rotation axis direction of the discharge roller 12. The direction is perpendicular to the line passing through the center of the minute) and the center of rotation of the discharge roller 12.

Similarly, for the second idler roller 14c, one end surface 14cF (one end) is represented by a solid line, and the other end surface 14cB (the other end) is represented by a broken line. The center of one end surface 14cF of the second idler roller 14c is C2, and the center of the other end surface 14cB is C2'. 13 (b) and 13 (c) are perspective views of the first idler roller 13c and the second idler roller 14c. The sheet is conveyed by the nip portion N2 (second nip portion) formed by contacting the discharge roller 12 and the second idler roller 14c. The sheet transport direction D2 (second transport direction) of the nip portion N2 is a line connecting the center (C2 and C2') of the second idler roller 14c in the rotation axis direction when viewed from the rotation axis direction of the discharge roller 12. The direction is perpendicular to the line passing through the center of the minute) and the center of rotation of the discharge roller 12.

The rotation axis of the first idler roller 13c is tilted with respect to the rotation axis of the discharge roller 12 as follows. When viewed in the rotation axis direction of the discharge roller 12, the center C1'of the other end surface 13cB of the first idler roller 13c in the rotation axis direction is located at the center C1 of the one end surface 13cF in the sheet transport direction D1 at the nip portion N1. On the other hand, it is shifting downstream. The rotation axis of the second idler roller 14c is tilted with respect to the rotation axis of the discharge roller 12 as follows. When viewed in the rotation axis direction of the discharge roller 12, the center C2'of the other end surface 14cB of the second idler roller 14c in the rotation axis direction is located at the center C2 of the one end surface 14cF in the sheet transport direction D2 at the nip portion N2. On the other hand, it is shifting downstream.

Further, with respect to how the first idler roller 13c and the second idler roller 14c are inclined with respect to the discharge roller 12, from a definition different from that described above, FIGS. 14 (a) and 14 (a) This will be described with reference to b) and FIG. 14 (c).

FIG. 14A is a view of the discharge roller 12, the first idler roller 13c, and the second idler roller 14c as viewed from the rotation axis direction of the discharge roller 12. In FIG. 14A, one end surface 13cF of the first idler roller 13c is represented by a solid line, and the other end surface 13cB is represented by a broken line. The center of one end surface 13cF of the first idler roller 13c is C1, and the center of the other end surface 13cB is C1'.

Similarly, for the second idler roller 14c, one end surface 14cF is represented by a solid line and the other end surface 14cB is represented by a broken line. The center of one end surface 14cF of the second idler roller 14c is C2, and the center of the other end surface 14cB is C2'. 14 (b) and 14 (c) are perspective views of the first idler roller 13c and the second idler roller 14c. The center C1 of the one end surface 13cF of the first idler roller 13c and the center C2 of the one end surface 14cF of the second idler roller 14c are on the same side in the rotation axis direction of the discharge roller 12.

Here, in the cross section perpendicular to the rotation axis of the discharge roller 12, the regions separated by the virtual line v12 passing through the center C1 and the center C2 are referred to as the first region A1 and the second region A2. The first idler roller 13c is tilted with respect to the discharge roller 12 so that the center C1'of the other end surface 13cB is in the first region A1. Similarly, the second idler roller 14c is tilted with respect to the discharge roller 12 so that the center C2'of the other end surface 14cB is in the second region A2.

Further, in the present embodiment, as described above, the first sheet transport section 80A and the second sheet transport section 80B have a center line in the width direction of the discharge transport path 31, that is, a central portion in the rotation axis direction of the discharge roller 12. It is provided symmetrically with respect to. The transport directions of the first idler rollers 13c and the second idler rollers 14c of the first sheet transport section 80A and the second sheet transport section 80B are directed outward by a predetermined angle with respect to the sheet transport direction. That is, when the sheet S is conveyed by the sheet discharging unit 70, the sheet S is stretched outward in the width direction, and it is possible to prevent skewing and wrinkle formation on the sheet S.

In the present embodiment, the sheet discharging unit 70 has a pair of sheet transporting units (80A, 80B), but the present invention is not limited to this, and for example, two or more pairs of sheets arranged side by side in the width direction. It may have a transport section.

<Second Embodiment>
Next, a second embodiment of the present invention will be described with reference to FIG. The second embodiment is a modification of the configurations of the first idler roller 13c and the second idler roller 14c of the first embodiment, and the same configurations as those of the first embodiment are shown in the illustration. The description will be omitted or the figures will be described with the same reference numerals.

The first idler roller 23 (first rotating body) of the present embodiment has a disk-shaped first disc portion 23a and a second disc portion 23b arranged side by side in the axial direction, and the first disc portion 23a The second disc portion 23b is fixed to the first rotating shaft 13. Further, the second idler roller 24 (second rotating body) has a disk-shaped third disc portion 24a and a fourth disc portion 24b arranged side by side in the axial direction, and these third disc portions 24a and the second disc portion 24b. The 4 disc portion 24b is fixed to the second rotating shaft 14.

The first disc portion 23a and the second disc portion 23b are arranged symmetrically with respect to the central position in the width direction of the discharge roller 12. The third disc portion 24a and the fourth disc portion 24b are arranged symmetrically with respect to the central position in the width direction of the discharge roller 12. In other words, recesses 23c and 24c that do not come into contact with the discharge roller 12 are formed in the central portion between the first disk portion 23a and the second disk portion 23b and between the third disk portion 24a and the fourth disk portion 24b. The first recess and the second recess) are formed, respectively. The inclinations of the first rotating shaft 13 and the second rotating shaft 14 with respect to the rotating axis L1 of the discharge roller 12 are set in the same manner as in the first embodiment.

Therefore, the first disc portion 23a and the second disc portion 23b come into contact with each other symmetrically with respect to the central position in the width direction of the discharge roller 12. Further, the third disc portion 24a and the fourth disc portion 24b come into contact with each other symmetrically with respect to the central position in the width direction of the discharge roller 12. As a result, the discharge roller 12, the first idler roller 23, and the second idler roller 24 can stably and more smoothly convey the sheet S, and can reduce damage such as wrinkles on the sheet.

In the present embodiment, both the first idler roller 23 and the second idler roller 24 have two disc portions, but one of them may be configured to have two disc portions. One or more may be formed.

<Third embodiment>
Next, a third embodiment of the present invention will be described with reference to FIG. The third embodiment is a modification of the configurations of the first idler roller 13c and the second idler roller 14c of the first embodiment, and the same configurations as those of the first or second embodiment are used. , Illustration is omitted, or the same reference numerals are given to the drawings. Further, the description of the same effect as that of the second embodiment will be omitted.

The first idler roller 33 (first rotating body) according to the present embodiment has a disk-shaped first disk portion 33a, a second disk portion 33b, a fifth disk portion 33c, and a sixth disk portion arranged side by side in the axial direction. It has a disk unit 33d. The first disc portion 33a and the second disc portion 33b are arranged symmetrically with respect to the central position in the width direction of the discharge roller 12. The fifth disc portion 33c and the sixth disc portion 33d are arranged symmetrically with respect to the central position in the width direction of the discharge roller 12. The inclinations of the first rotating shaft 13 and the second rotating shaft 14 with respect to the rotating axis L1 of the discharge roller 12 are set in the same manner as in the first embodiment.

The third disc portion 24a and the fourth disc portion 24b constituting the second idler roller 24 (second rotating body) are the first disc portion 33a, the second disc portion 33b, the fifth disc portion 33c, and the sixth disc portion 33d. It is arranged so as to be offset in the axial direction. Further, the third disc portion 24a and the fourth disc portion 24b overlap with the first disc portion 33a, the second disc portion 33b, the fifth disc portion 33c, and the sixth disc portion 33d in the radial direction. More specifically, the third disk unit 24a is inserted between the first disk unit 33a and the fifth disk unit 33c, and the fourth disk unit 24b is a combination of the second disk unit 33b and the sixth disk unit 33d. It is structured to get in between.

As a result, the outer diameters of the first disk unit 33a, the second disk unit 33b, the third disk unit 24a, the fourth disk unit 24b, the fifth disk unit 33c, and the sixth disk unit 33d can be made large. Therefore, the tip of the sheet S can be thrust into these discs at a shallow angle, and the occurrence of jam and damage to the tip of the sheet can be reduced.

In the present embodiment, the first idler roller 33 has four disc parts and the second idler roller 24 has two disc parts, but the number of these disc parts is any number. You may.

<Fourth Embodiment>
Next, a fourth embodiment of the present invention will be described with reference to FIG. The fourth embodiment is a modification of the configurations of the first idler roller 13c and the second idler roller 14c of the first embodiment, and the same configurations as those of the first embodiment are shown in the illustration. The description will be omitted or the figures will be described with the same reference numerals. Further, the description of the same effect as that of the second or third embodiment will be omitted.

The first idler roller 43 (first rotating body) according to the present embodiment has two central disc portions 43a and 43a provided at the central portion in the width direction and two both ends provided at both ends in the width direction. It has disk portions 43b and 43b. The outer diameters of the disc portions 43b and 43b at both ends are set to be smaller than those of the central disc portions 43a and 43a, and the entire first idler roller 43 is formed in a drum shape.

Further, the second idler roller 44 (second rotating body) has two central disc portions 44a and 44a provided at the central portion in the width direction and two both end disc portions 44b provided at both end portions in the width direction. It has 44b and. The outer diameters of the disc portions 44b and 44b at both ends are set to be smaller than those of the central disc portions 44a and 44a, and the entire second idler roller 44 is formed in a drum shape. Further, the inclinations of the first rotating shaft 13 and the second rotating shaft 14 with respect to the rotating axis L1 of the discharge roller 12 are set in the same manner as in the first embodiment.

In the present embodiment, since the first idler roller 43 is formed in a drum shape as a whole, the sheet S pulled between the fixing portion 60 and the sheet discharging portion 70 is formed at the end portion of the first idler roller 43. It is possible to prevent local contact. That is, since the first idler roller 43 is provided at an angle with respect to the discharge roller 12, the upstream side of the first idler roller 43 in the sheet transport direction hits more strongly than the downstream side. However, in the present embodiment, since the outer diameters of the disc portions 44b and 44b at both ends are set to be smaller than those of the central disc portions 44a and 44a, damage to the sheet can be prevented.

6: Image carrier (photoreceptor drum) / 7: Transfer part (transfer roller) / 12: Transfer roller (discharge roller) / 13: First shaft part (first rotation shaft) / 13a: One end part / 13b: Other Ends / 13c, 23, 33, 43: First rotating body (first idler roller) / 13cB: Other end (other end surface) / 13cF: One end (one end surface) / 14: Second shaft part (second rotating shaft) ) / 14a: One end / 14b: The other end / 14c, 24, 44: Second rotating body (second idler roller) / 14cB: The other end (the other end surface) / 14cF: One end (one end surface) / 15: Holder (Holding member) / 15a: First support portion (first side wall) / 15b: Second support portion (second side wall) / 23c: First recess (recess) / 24c: Second recess (recess) / 60: Fixation Part / 80A: Sheet transfer device (first sheet transfer unit) / 100: Image forming device (printer) / A1: First area / A2: Second area / C1: Center / C1': Center / D1: First transfer Direction (sheet transport direction) / D2: Second transport direction (sheet transport direction) / L1: Rotation axis (rotation axis) / L2: Rotation axis (rotation axis) / L3: Rotation axis (rotation axis) / N1: 1st nip part (nip part) / N2: 2nd nip part (nip part) / S: sheet / v12: virtual line

Claims (6)

With the transport roller
A first rotating body that rotates in contact with the transport roller and forms a first nip portion that transports the sheet in the first transport direction together with the transport roller.
A sheet provided downstream of the first rotating body in the rotation direction of the transfer roller and rotating in contact with the transfer roller to convey the sheet conveyed by the first nip portion in the second transfer direction. A second rotating body that forms a second nip portion together with the transport roller is provided.
The rotation axis of the first rotating body and the rotation axis of the second rotating body are inclined with respect to the rotation axis of the transport roller.
A rotating shaft of the first rotating body, the rotation axis of said second rotary member, the Ri nonparallel der each other,
In the rotation axis of the first rotating body, the center of one end of the first rotating body is the center of the other end of the first rotating body when viewed in the direction of the rotation axis of the transport roller. It is tilted with respect to the rotation axis of the transport roller so that it is located at a different position in the direction.
In the rotation axis of the second rotating body, the center of one end of the second rotating body is the center of the other end of the second rotating body when viewed in the direction of the rotation axis of the transport roller. It is tilted with respect to the rotation axis of the transport roller so that it is located at a different position in the direction.
A sheet transfer device characterized by this. A holder for holding the first rotating body and the second rotating body so as to be rotatable and so that the rotation axis of the first rotating body and the rotating axis of the second rotating body are non-parallel.
The sheet transporting apparatus according to claim 1 . The first rotating body has first shaft portions extending from both ends in the rotation axis direction of the transport roller.
The second rotating body has a second shaft portion extending from both ends in the rotation axis direction of the transport roller.
The holder includes a first support portion that supports one end portion of the first shaft portion and one end portion of the second shaft portion on the same side as the one end portion of the first shaft portion.
It has a second support portion that supports the other end of the first shaft portion and the other end of the second shaft portion on the same side as the other end of the first shaft portion.
The sheet transporting apparatus according to claim 2 . The angle formed by the rotating shaft of the transport roller and the rotating shaft of the first rotating body is 1 ° or more and 3 ° or less.
The angle formed by the rotating shaft of the transport roller and the rotating shaft of the second rotating body is 1 ° or more and 3 ° or less.
The sheet transport device according to any one of claims 1 to 3 , wherein the sheet transport device is characterized by this. The central portion of the first rotating body in the rotation axis direction has a first recess that does not come into contact with the transport roller.
The central portion of the second rotating body in the rotation axis direction has a second recess that does not come into contact with the transport roller.
The sheet transport device according to any one of claims 1 to 4 , wherein the sheet transport device is characterized by this. A transfer unit that transfers the toner image formed on the image carrier to the sheet,
A fixing portion for fixing the toner image transferred to the sheet by the transfer portion to the sheet, and a fixing portion.
The sheet transport device according to any one of claims 1 to 5 , which transports a sheet on which a toner image is fixed by the fixing portion, is provided.
An image forming apparatus characterized in that.

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