JPH08197794A - Sheet conveying device and recording device - Google Patents

Abstract

(57) [Abstract] [Purpose] The pressure to contact the sheet of the rotating body for conveyance is
The object is to prevent skewing by making the lengthwise uniform and maintaining the state in which the pair of conveying rotating bodies are parallel to each other. A first rotating body, a second rotating body that conveys a sheet in cooperation with the first rotating body, a support member that rotatably supports the second rotating body, and the first rotating body. In order to press the second rotary body against the first rotary body, a biasing means for biasing a position of the support member corresponding to the widthwise center of the second rotary body, and the support member of the first rotary body The second rotating body is tilted in the carrying direction, and the supporting means is in contact with a position corresponding to the center of the second rotating body in the width direction and receives the reaction force received by the second rotating body from the first rotating body. In order to prevent the above, the sheet conveying apparatus includes a movement regulating unit that abuts the supporting member and regulates the inclination of the second rotating body with respect to the conveying direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying device applied to a recording device or the like.

[0002]

2. Description of the Related Art Conventionally, a recording device installed in a printer, a copying machine, a facsimile, or the like, or a recording device used as an output device of a multifunction machine or a workstation including a computer, a word processor, etc. An image (including characters, symbols, etc.) is recorded on a recording material such as a plastic thin plate (for example, an OHP sheet). This recording device can be classified into an ink jet type, a wire dot type, a heat sensitive type, a thermal transfer type, a laser beam type and the like depending on the recording system of the recording means used.

Among the above-described recording apparatuses, in the serial type recording apparatus in which the recording head performs main scanning in a direction intersecting the recording material conveyance direction (sub-scanning direction), the recording material is set at a predetermined recording position. After that, an image (including characters and symbols) is recorded by a recording unit (recording head) mounted on a carriage that moves (main scanning) along a recording material, and after recording one line, a predetermined amount is recorded. The image is recorded in a desired range of the recording material by repeating the operation of feeding the paper (sub-scanning) and recording the image of the next line (main scanning). On the other hand, in a line type recording apparatus that performs recording by only sub-scanning in which the recording material is fed in the transport direction, the recording material is set at a predetermined recording position, and one line of recording is continuously performed at one time. While feeding a predetermined amount of paper (pitch conveyance), an image is recorded on the entire recording material.

As shown in FIGS. 12 and 13, a pinch roller 103 is arranged in the recording material conveying portion so as to press the recording sheet 101 against a paper feed roller 102 for conveying the recording sheet 101. ing. The pinch roller 103 is a holder fulcrum 1 which is a fulcrum of rotation.
It is rotatably supported by the pinch roller holder 104 having 04a. The pinch roller holder fulcrum 104a is rotatably mounted on a base (not shown), and the biasing force of the pinch roller spring 105 is applied to the pinch roller 103 via the pinch roller holder 104.

[0005]

However, in the above-mentioned conventional example, since the holder fulcrum portion 104a and two places are rotatably supported by the base, the two bearing portions are not supported due to, for example, manufacturing error or deformation of the frame due to impact. As shown in FIG. 14, when the paper feed roller 102 is not parallel, the pinch roller 103 is in a state of partial contact with the paper feed roller 102. Therefore, the pressure contact force to the recording sheet 101 becomes non-uniform, which causes skewing and the like. On the other hand, in order to solve the above-mentioned adverse effect of one-sided contact, the supporting portion 104a
As shown in FIG. 15, the left and right (upper and lower sides in FIG. 15) positions of the pinch roller 3 are not fixed when the center is located at one center, and the pressure contact state becomes unstable, which causes skewing.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to prevent skewing by making the pressure of the conveying rotary member in contact with the sheet uniform in the longitudinal direction.
A further object of the present invention is to prevent skewing by allowing the pair of transporting rotating bodies to remain parallel to each other.

The structure of the present invention for attaining the above object comprises a first rotating body, a second rotating body which cooperates with the first rotating body to convey a sheet, and the second rotating body. A support member for rotatably supporting the body and the second member of the support member for pressing the second rotary member against the first rotary member.
The biasing means for biasing the position corresponding to the center of the rotating body in the width direction and the position corresponding to the center of the supporting member in the width direction of the second rotating body. In order to prevent the supporting means that receives a reaction force received from the first rotating body and the second rotating body from inclining with respect to the conveying direction, the supporting means abuts on the supporting member and the conveying direction of the second rotating body. And a movement regulation unit that regulates an inclination with respect to the sheet conveyance device.

[0008]

1 to 3 show a recording apparatus embodying the present invention. In this embodiment, the present invention is applied to an inkjet recording device. First, the outline of the operation will be described.

A pressure plate 8 is rotatably supported at both ends in the longitudinal direction by the frame 4, and is urged toward the pickup roller 9 by pressure applying means. The recording medium P is loaded on the pressure plate 8. The recording medium P is sent out onto the pressure plate 8 by the pickup roller 9 which rotates in response to the paper feed command, and is separated by the separating means 29 into a single sheet and conveyed to the recording section. Separated recording medium P
Is a conveying roller whose both ends are supported by a frame 4 and a base 1.
The sheet 4 is conveyed while being sandwiched between the pinch roller 7 provided on the sheet No. 4 and the sheet discharge roller 15 and the spur-like rotator 16. A recording unit is between the transport roller 6 and the paper discharge roller 15. In the recording unit, the carriage 2 is slidably supported by the guide shaft 5, and recording is performed while moving in a direction orthogonal to the conveyance direction of the recording medium P. Here, the printhead cartridge 1 is mounted on the carriage 2, and signals and the like are transmitted to the printhead cartridge 1 from the flexible cable 3. The recording head cartridge 1 is integrally configured with a recording head and an ink tank that contains ink, and is attachable to and detachable from the carriage 2. The ink tank may be a replaceable ink tank that is detachable from the recording head. The carriage 2 is supported by the guide shaft 5 and also has guide rails 12 whose both ends are fixed to the frame 4.
The two supporting portions keep the distance between the nozzle of the recording head ejecting ink from the recording medium 13 and the surface of the recording medium 13 substantially constant. The carriage 2 is wound around a drive pulley that is rotated by the driving force of the carriage drive motor 10.

The carriage drive belt 11 moves along the guide shaft 5.

FIG. 2 is a view showing a state of the apparatus in which the carriage 2 and the recording head 1 shown in FIG. 1 are moved from the standby position.

A cap 17 is provided at a position facing a face surface of a recording head (not shown), and the cap 17 is connected to a cylinder 18. The driving force of the LF motor 19 is transmitted to the LF gear 20 fixed to the transport roller 6, and the pump gear 22 is driven by the switching operation of the trigger gear 21 at the same time as the transport roller 6 is driven. The rotation of the pump gear 22 is performed by the cylinder gear 23.
And a suction operation is performed from the cap 17 by moving a piston (not shown) in the cylinder 18. The driving force of the LF motor 19 is transmitted to the pickup gear 24 via a transmission switching mechanism (not shown), and the pickup roller 9 is driven.

On the other hand, on the opposite end side of the carrying roller 6, the driving force of the carrying roller 6 is pressed against the carrying roller 6, as shown in FIG. It is transmitted to the paper discharge idle roller 25, and further, via the paper discharge idle gear 26, a paper discharge gear 27.
And the paper discharge roller 15 is driven.

FIG. 3 is a cross-sectional view of the apparatus shown in FIGS. 1 and 2, showing the passage of the recording medium P. Recording medium P
The pressure plate spring 28 causes the pressure plate 8 to move the pickup roller 9
The pick-up roller 9 which is pressed against and rotates, provides a driving force for sheet feeding. As a separating means, a pressure plate 8
An embankment sheet 29 having elasticity is arranged at an end portion of the recording medium P stacked on the side on the feeding direction side. The bank sheet 29 has a lower end fixed to the base 14 and an upper end free. The separation of the recording medium P given the conveying force by the pickup roller 9 is stopped on the bank sheet 29 so that only the uppermost recording medium P is transported over the upper end of the bank sheet 29 and the remaining recording medium P is conveyed.
Is performed by being stopped by the bank sheet 29. The separation pad 30 is for separating the recording media P when the remaining recording media P are two.

The separated recording medium P contacts the DE sensor lever 31 which is rotatably supported about the support shaft 31a, and is swung from the position of the normal broken line to the position of the solid line while being conveyed to the conveying roller 6. Sent in. The movement of the DE sensor lever 31 turns the DE sensor 32 on and off,
The presence / absence of the recording medium P can be determined. DE sensor 3
ON / OFF of 2 is used to detect the position of the leading edge of the recording medium P, and is used to determine the sequence at the time of feeding.
It is also used to detect the trailing edge of the recording medium P.

The pinch roller 7 is a pinch roller holder 3
3 is rotatably held, and the pinch roller holder 33 is rotatably supported by the base 14 by cylindrical support portions 33a and 33b. In addition, the pinch roller holder is 33
A pinch roller spring 34 composed of a coil spring is mounted on the opposite side of the support portion 33a with the pinch roller 7 narrowed. The pinch roller 7 presses the recording medium P against the conveying roller 6 by the urging force of the pinch roller spring 34.

Recording medium 1 supplied by the conveying roller 6
The sheet 3 is printed by the recording head 1 mounted on the carriage 2 and then sent to the sheet discharge section. The paper discharge section is composed of two rows of paper discharge rollers 15 and two rows of spur rollers 16, and the recording medium P is held by the spurs 16 and paper discharge rollers 15 by the urging force of the paper discharge spring 35. The recording medium P on which recording has been completed is ejected out of the apparatus by the two rows of paper ejection rollers.

FIG. 4 is a view showing how the pinch roller 7 and the pinch roller holder 33 are attached to the apparatus. After the pinch roller holder 33 supporting the pinch roller 7 and the pinch roller spring 34 are mounted on the base 14, the frame 4 on which the transport roller 6 is mounted is the base 1.
It is attached to 4.

5 to 8 are views showing the periphery of the pinch roller holder 33, which is the main part of the present invention. FIG. 5 is a view of the pinch roller holder 33 as viewed from above (on the side of the transport roller 6). FIG. 6 is a schematic center view of the pinch roller holder.
FIG. FIG. 7 is a sectional view when the pinch roller holder 33 is viewed from the direction B in FIG. FIG. 8 is a plan view showing the support structure of the pinch roller 7.

At the central portion of the pinch roller holder 33, as shown in FIG. 6, a shaft-shaped holder supporting portion center (first shaft portion) 33c and a holder spring receiving portion 33g are provided. The pinch roller holder 33 is temporarily attached to the base 14 by the hook-shaped base holder temporary fixing portion 14 a, and the pinch roller spring 34 is provided even when the transport roller 6 is not provided.
It is in a state where it cannot be removed against the spring pressure of.

The pressure of the pinch roller spring 34 is received in the upward direction by the holder spring receiving portion 33g, and the pinch roller 7 is moved upward with respect to the conveying roller 6 via the holder pinch roller receiving portion left 33d and right 33e. Is pressed against.
At this time, the holder support portion center 33c is pressed by the reaction force toward the downward base 14. Base holder receiving center 1
4b is formed as an ellipse that is long in the lateral direction (conveyance direction), has a gap in the conveyance direction with respect to the holder support center 33c, and receives the pressure contact force of the pinch roller 7 without fail, but the recording medium 13 The pinch roller holder 33 in the transport direction is free to be positioned.

At the right end portion of the pinch roller holder 33, as shown in FIG. 7, the holder support portion right (second shaft portion) 33b.
Also, a holder pinch roller receiving portion right 33e is provided. The pinch roller 7 is rotatably supported by the holder pinch roller receiving portion right 33e, and the pinch roller holder 33 is mounted on the base 14 by the holder supporting portion right 33b.

Shaft-shaped holder support part right (second shaft part) 3
3b is mounted on the right side of the base holder receiving portion 14c formed by a long U-shaped groove long in the vertical direction (the direction intersecting the sheet conveying direction) without any gap in the conveying direction, and of the pinch roller holder 33 in the conveying direction of the recording medium 13. Positioning is surely performed. Since the base holder receiving portion right 14c has a vertically long U groove, the holder supporting portion right 33b is the pinch roller 7
It is configured so that the reaction force base 14 of the pressure contact force is not received. The holder supporting portion left (third shaft portion) 33a is attached to the base holder receiving portion left 14a similarly to the holder supporting portion right 33b.

Due to the shapes of the pinch roller holder 33 and the base 14 described above with reference to FIGS. 5 to 8, the pinch roller 7 has only one central supporting portion for receiving the reaction force of the pressing force, and the recording medium is positioned in the conveying direction. Is surely done in two places, left and right.

(Other Embodiments) FIGS. 9 to 11 show a second embodiment of the present invention, and FIG. 9 is a view of the pinch roller holder 33 seen from above. FIG. 10 is a cross-sectional view of the pinch roller holder 33 taken along the line A in the substantially central portion 9. Figure 11
Shows a sectional view of the pinch roller holder 33 seen from the direction B in FIG. 9.

The description overlapping with the first embodiment will be omitted. Figure 10
The center 33c of the holder support is positioned in the left / right direction and the up / down direction, which is different from the first embodiment. Further, a shaft-shaped holder pinch roller receiving portion center 33f which is not provided in the first embodiment is provided, and the center portion of the opposing pinch roller 7 also has a small diameter. The pressing force of the pinch roller spring 34 is transmitted to the pinch roller 7 via the center 33f of the holder pinch roller receiving portion. A gap is provided in the recording medium 13 transport direction at the center 33f of the holder pinch roller receiving portion, and the pinch roller 7 in this direction is provided.
Is not positioned.

In FIG. 11, the holder supporting portion right 33b is positioned in contact with the base 14 in the left / right direction and the up / down direction, which is different from the first embodiment. The holder pinch roller receiving right portion 33d is formed of a vertically long ellipse, and positions the pinch roller 7 in the recording medium 13 transport direction. Since the holder pinch roller receiving portion right 33d is an elongated oval, the pressing force cannot be transmitted from the pinch roller holder 33 to the pinch roller 7.

Due to the shapes of the pinch roller holder 33 and the pinch roller 7 described above with reference to FIGS. 6 to 8, the pinch roller 7 has a central supporting point that receives a pressing force, and the recording medium 13 is positioned in the conveying direction. Is left and right 2
It is surely done in several places.

In this embodiment, the holder supporting portions are left, right,
Although it is provided at three places in the center, it may be provided only at two places on the left and right.

In the ink jet head used in each of the above-mentioned embodiments, the heating element is provided in the nozzle for ejecting ink, and the thermal energy generated by the heating element forms a bubble in the ink, and the bubble expands. The ink droplets are ejected from the nozzles.

[0031]

As described above, according to the present invention, skewing can be prevented by making the pressure of the conveying rotary member in contact with the sheet uniform in the longitudinal direction. Further, according to the present invention, it is possible to prevent skewing by enabling the pair of rotating bodies for conveyance to be maintained in parallel with each other.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram showing a first embodiment of the present invention.

FIG. 3 is a diagram showing a first embodiment of the present invention.

FIG. 4 is a diagram showing a first embodiment of the present invention.

FIG. 5 is a diagram showing a first embodiment of the present invention.

FIG. 6 is a diagram showing a first embodiment of the present invention.

FIG. 7 is a diagram showing a first embodiment of the present invention.

FIG. 8 is a diagram showing a first embodiment of the present invention.

FIG. 9 is a diagram showing a second embodiment of the present invention.

FIG. 10 is a diagram showing a second embodiment of the present invention.

FIG. 11 is a diagram showing a second embodiment of the present invention.

FIG. 12 is a diagram showing a conventional example.

FIG. 13 is a diagram showing a conventional example.

FIG. 14 is a diagram showing a conventional example.

FIG. 15 is a diagram showing a conventional example.

[Explanation of symbols]

 1 Recording Head 2 Carriage 3 Flexible Cable 4 Frame 5 Guide Shaft 6 Conveying Roller 7 Pinch Roller 8 Pressure Plate 9 Pickup Roller 10 Carriage Drive Motor 11 Carriage Drive Belt 12 Guide Rail 13 Recording Medium 14 Base 15 Paper Ejection Roller 16 Spurs 17 Cap 18 Cylinder 19 LF motor 20 LF gear 21 Trigger gear 22 Pump gear 23 Cylinder gear 24 Pickup gear 25 Ejection idle roller 26 Ejection idle gear 27 Ejection gear 28 Pressure plate spring 29 Bank sheet 30 Separation pad 31 DE sensor lever 32 DE sensor 33 Pinch roller holder 34 Pinch roller spring 35 Paper ejection spring

 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Hideaki Kawakami 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Takashi Nojima 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon (72) Inventor Hideki Yamaguchi 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Akira Kida 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. ( 72) Inventor Takeshi Iwasaki 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (24)

[Claims] 1. A first rotating body, a second rotating body that cooperates with the first rotating body to convey a sheet, and a support member that rotatably supports the second rotating body. Urging means for urging a position of the support member corresponding to the widthwise center of the second rotator to press the second rotator against the first rotator; Supporting means for contacting with a position corresponding to the center of the second rotating body in the width direction and receiving a reaction force received by the second rotating body from the first rotating body; A sheet conveying device including: a regulation unit that is in contact with the support member and that regulates the inclination of the second rotating body with respect to the conveying direction in order to prevent the second rotating body from being inclined. 2. The sheet conveying apparatus according to claim 1, wherein the regulating means regulates the movement of the supporting member in the conveying direction by contacting the supporting member at both end portions of the supporting member. 3. The sheet conveying apparatus according to claim 1, wherein the first rotating body includes a conveying roller. 4. The sheet conveying apparatus according to claim 1, wherein the second rotating body includes a pinch roller. 5. The sheet conveying apparatus according to claim 1, wherein the supporting unit allows movement of the supporting member in a sheet conveying direction. 6. The regulating means is the first of the supporting means.
The sheet conveying apparatus according to claim 1, wherein the sheet conveying apparatus is allowed to move toward and away from the rotating body. 7. The supporting member has a first shaft portion extending in the width direction at the center in the width direction, and the supporting means has a bearing having a predetermined play in the carrying direction for supporting the first shaft portion. The sheet conveying device according to claim 1. 8. The support member has second and third shaft portions at both end portions, and the movement restricting means makes contact with the upstream and downstream sides of the second and third shaft portions in the transport direction. The sheet conveying device according to claim 1. 9. The sheet conveying apparatus according to claim 1, further comprising a borrowing member for temporarily fixing the supporting member to the apparatus main body. 10. The seat according to claim 1, wherein the second rotating body is supported between a position urged by the urging means of the support member and a position supported by the support means. Transport device. 11. A first rotating body, a second rotating body that cooperates with the first rotating body to convey a sheet, and a support member that rotatably supports the second rotating body. Urging means for urging a position of the support member corresponding to the widthwise center of the second rotator to press the second rotator against the first rotator; A support portion that is in contact with a position corresponding to the widthwise center of the second rotating body and receives a reaction force that the second rotating body receives from the first rotating body; and both ends of the second rotating body. A sheet conveying apparatus, comprising: a movement regulating portion that regulates movement of a portion in the conveying direction. 12. The sheet conveying apparatus according to claim 11, wherein the movement restricting portion has a groove that engages with both ends of the second rotating body. 13. The sheet conveying apparatus according to claim 11, wherein the first rotating body includes a conveying roller. 14. The sheet conveying apparatus according to claim 11, wherein the second rotating body includes a pinch roller. 15. The supporting member has shaft portions at both end portions on the upstream side in the transport direction with respect to the position supporting the second rotating body, and the movement restricting means includes the second and third moving portions. The sheet conveying apparatus according to claim 11, wherein the shaft portion comes into contact with the upstream side and the downstream side in the conveying direction. 16. The seat according to claim 11, wherein the second rotating body is supported between a position urged by the urging means of the supporting member and a position supported by the supporting means. Transport device. 17. The sheet conveying device according to claim 11, further comprising recording means for recording on the sheet conveyed by the first and second rotating bodies. 18. A first rotating body, a second rotating body that cooperates with the first rotating body to convey a sheet, and a support member that rotatably supports the second rotating body. Urging means for urging a position of the support member corresponding to the widthwise center of the second rotator to press the second rotator against the first rotator; Supporting means for contacting with a position corresponding to the center of the second rotating body in the width direction and receiving a reaction force received by the second rotating body from the first rotating body; And a sheet conveyed by the first and second rotating bodies, in order to prevent the sheet from being inclined with respect to each other, a movement regulating unit that abuts on the supporting member to regulate the inclination of the second rotating body with respect to the conveying direction. A recording device having: a recording unit that records on the recording medium. 19. The recording apparatus according to claim 18, wherein the recording unit performs recording by ejecting ink droplets. 20. The recording apparatus according to claim 19, wherein the recording unit records with ink droplets ejected by thermal energy. 21. The sheet conveying apparatus according to claim 1, wherein a plurality of pairs of the first and second rotating bodies are uniquely arranged and arranged side by side in the width direction. 22. A conveying device of a recording apparatus, comprising: a conveying roller for conveying a recording sheet; a pinch roller for pressing the recording sheet to the conveying roller; and a pinch roller holder for supporting the pinch roller. Conveying means for a recording apparatus, wherein a supporting portion for receiving a pressing force for the pressure contact of the pinch roller is different from a supporting portion for regulating the conveying direction of the pinch roller. 23. The pressing direction is regulated at the central portion of the axial direction of the pinch roller, and the recording sheet conveying direction is regulated at both ends of the axial direction axis of the pinch roller. 22. Conveying means of the recording apparatus according to item 22. 24. A pressing force for pressing the pinch roller against the conveying roller is given through the pinch roller holder, and a substantially central portion of the pinch roller holder is regulated in a pressing direction. 24. The conveying device of the recording apparatus according to claim 23, wherein substantially both ends of the sheet are regulated in the recording sheet conveying direction.