JPH10265083A - Sheet material carrying device and image processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet material carrying device which can remove a jammed sheet material easily without damaging the sheet material and inviting the wear and damage of a friction transmission part such as rollers at the time of unjamming. SOLUTION: In a carrying system having a carrying roller 31 and discharge roller 37 for carrying a sheet material and a transmission roller 36 for transmitting the drive force of the carrying roller 31 to the discharge roller 37 while press-contacting with both rollers 31, 37, a transmission roller spring 35 for energizing while pivoting the discharge roller 37 and transmission roller 36 is installed on an upper manuscript stand unit 25 openable/closable to a read base 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying apparatus, and more particularly, to a sheet conveying apparatus for conveying a sheet material such as a document or a recording sheet in an image processing apparatus such as a copying machine, a printer, a facsimile machine, and the like. It is about.

[0002]

2. Description of the Related Art Conventionally, in an image processing apparatus such as a copying machine, a printer, a facsimile machine, etc., as a sheet conveying apparatus for conveying a sheet material such as a document or a recording sheet, for example, a first conveying roller for conveying a sheet material and a A second transport roller that transports the sheet material downstream of the first transport roller in the transport direction, and a transmission roller that presses against the two rollers and transmits the driving force of the first transport roller to the second transport roller. Some have.

In the above-mentioned sheet conveying apparatus, the transmission roller is fixed to the apparatus main body, and is urged against the outer peripheral surface of the first conveying roller and the outer peripheral surface of the second conveying roller.

[0004]

However, in the above-mentioned conventional example, there is no mechanism for releasing the pressure-contact state of the transmission roller pressed against the first and second transport rollers, so that there are the following problems. Was.

[0005] For example, even if the sheet conveying path is opened to release the jam of the sheet, the pressed state of the transmission rollers is not released, so the jammed sheet is conveyed by the transmission rollers. The roller was pressed against the opposing position (a roller, a guide, or the like), and was kept nipped. Therefore, even if the sheet material conveying path is opened, the sheet material is still caught by the holding portion due to the above-described holding force (the urging force of the transmission roller), so that the sheet material cannot be pulled out. There was a risk of damaging the sheet material.

Further, even if the sheet material can be pulled out in the above-described state, the sheet material is forcibly pulled out. Therefore, the friction transmitting portion (between the first transport roller and the transmission roller, the transmission roller and the second (Between the conveying rollers), causing the rollers and the rollers to be worn or damaged, and the normal sheet conveyance may not be performed.

Accordingly, an object of the present invention is to easily remove a jammed sheet material without damaging the sheet material and causing abrasion or damage of a friction transmitting portion such as a roller or a roller at the time of jam processing. It is an object of the present invention to provide a sheet conveying device capable of performing the above-mentioned operations.

[0008]

In order to achieve the above object, a typical configuration of the present invention comprises a first rotating body and a second rotating body that convey a sheet material, and a first rotating body and a second rotating body that are brought into pressure contact with both rotating bodies. In a sheet conveying apparatus having a transmission rotator for transmitting a driving force of one rotator to a second rotator, a shaft supporting member for supporting the second rotator and the transmission rotator is opened and closed with respect to the apparatus main body. It is characterized in that it is attached to the same possible opening and closing member, and the bearing member has a function of pressing the transmission rotating body against the first rotating body and the second rotating body.

According to the above construction, by opening the opening / closing member, the positional relationship between the first rotating body and the transmission rotating body (ie, the bending of the shaft supporting member of the transmission rotating body) changes, and the transmission rotating body and the first rotating body are bent. Since the two rotators are separated from each other, the second rotator can idle, and the jammed sheet material can be easily pulled out without being damaged. Further, it is possible to prevent abrasion and damage of a friction transmitting portion such as a roller and a roller.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a sheet conveying apparatus to which the present invention is applied will be specifically described below.
In the following embodiment, an example is described in which the present invention is applied to a sheet conveying device that conveys a sheet material such as a document or a recording sheet in an image processing apparatus such as a copying machine, a laser beam printer, and a facsimile machine.

[First Embodiment] A sheet conveying apparatus according to a first embodiment will be described in detail with reference to the drawings.
In the present embodiment, an example is described in which the present invention is applied to a transport system that transports a document as a sheet material in a facsimile apparatus as an image processing apparatus.

FIG. 1 is a schematic cross-sectional view showing the overall structure of a facsimile apparatus according to the present embodiment, FIG. 2 is an external perspective view of the facsimile apparatus, FIG. 3 is a perspective view showing a CS unit of a reading system in the facsimile apparatus, FIG. 4 is a perspective view showing an upper platen unit of a reading system in the facsimile apparatus. 5 and 6 are enlarged views of a reading system in the facsimile apparatus, and FIG. 6 is an enlarged view showing a state when the upper document table unit is opened.

First, the schematic configuration of the facsimile apparatus will be briefly described. 1 and 2, reference numeral 1 denotes a facsimile apparatus main body, an operation unit A for operating the facsimile apparatus 1, and an ink jet system for discharging ink to a recording sheet as a sheet material in accordance with a signal to perform recording. The printing apparatus includes a recording unit B, a reading unit C for optically reading an image of a document as a sheet material, and the like. Hereinafter, the configuration of each unit will be described.

First, the configuration of the operation unit A will be described. The operation unit A is a key 2 for performing various operations such as a mode switching operation, a copy operation, a transmission operation, and a scanner operation.
And a display unit 3 for displaying various information. The operation unit A is provided above a document conveying system in a reading unit C described later, and is configured to be rotatable in the direction of arrow a shown in FIG.

Next, the configuration of the recording unit B will be described. Reference numeral 4 denotes a tray unit capable of stacking and storing a plurality of recording sheets. Reference numeral 5 denotes a middle plate on which recording paper is placed, and is provided rotatably with respect to the tray unit 4 with the upper end serving as a fulcrum. Reference numeral 6 denotes a pressure spring, which is configured to bias the middle plate 5 (and the recording paper stacked on the middle plate 5) in a direction in which the middle plate 5 contacts the pickup roller 11. Reference numeral 7 denotes a slider which is slidable with respect to the middle plate 5, and regulates the side of the recording paper to prevent the recording paper from skewing. Reference numeral 8 denotes an auxiliary tray, which can be pulled out and stored in the tray unit 4, and is configured to be compatible with long recording paper such as legal size.

Reference numeral 9 denotes a pickup roller sensor for detecting a protrusion (not shown) interlocked with the pickup roller 11 to detect the position of the pickup roller 11, and reference numeral 10 denotes an edge sensor for detecting the leading and trailing edges of the recording paper. .

The recording paper stacked and stored in the tray unit 4 is picked up by the pickup roller 11 and a separating claw (not shown), and is conveyed to the downstream conveying roller 12 only by the uppermost recording paper. At this time, the leading edge of the recording paper is detected by the edge sensor 10, and the transport roller 12 is driven by a driving unit (not shown) based on the detection signal. Then, the recording paper is nipped and conveyed by a conveyance roller 12 and a pinch roller 13 which is pressed against the conveyance roller 12 and is driven to rotate. When the recording paper reaches a predetermined position by rotating the transport roller 12 by a predetermined amount, recording is performed by a recording head 15 as recording means mounted on the carriage 14. The data recorded here is read data read by a reading unit C described later, or transmission data sent from another device.

In this embodiment, as described above, an ink jet type recording means for performing recording by discharging ink according to a signal is used. Further, in the present embodiment,
A cartridge type recording head in which an ink tank and an ink ejection head are integrated is used.
15 is configured to be detachable from the carriage 14 that can reciprocate in the width direction orthogonal to the transport direction. Therefore,
While scanning the carriage 14 in the width direction of the recording paper, an image is recorded by a recording head 15 mounted thereon. Reference numeral 16 denotes a waste ink tank for discharging clogged ink and the like in the head portion of the recording head 15.

The recording paper on which the recording has been performed as described above is driven by the transmission roller 17 to transmit the driving force of the transport roller 12, and the discharge roller 18 is rotated. It is nipped and conveyed by the spur 19 to be discharged, discharged onto the discharge tray 20, and stacked. Reference numeral 21 denotes an auxiliary tray which is detachably attached to the discharge tray 20. The auxiliary tray 21 prevents the leading end of a long recording sheet from slipping off the facsimile apparatus main body 1.

Next, the configuration of the reading unit C will be described. The reading unit C irradiates a document (not shown) with light, converts the reflected light into an electric signal, and transmits the signal to another device according to an operation mode, or transmits the signal to its own recording unit C. is there. The details will be described below.

Reference numeral 22 denotes a document placing tray on which a plurality of documents can be stacked, which also has a function as a cover member that can be opened and closed. That is, the original placing tray 22 is configured to be openable and closable about the fulcrum 22a in the direction of arrow b shown in FIG.
15 can be easily replaced.

Reference numeral 23 denotes a slider, which is slidable with respect to the document placing tray 22 and regulates the side of the document to prevent the document from skewing. Reference numeral 24 denotes an auxiliary tray, which is set at an optimum angle to support the rear end of the original placed on the original placing tray 22 and to maintain the separation and transport performance of the original.

Reference numeral 25 denotes an upper platen unit as an opening / closing member;
Reference numeral 26 denotes a reading base that supports the upper document table unit 25 so as to be openable and closable, and a part of both members is configured to function as a document conveyance guide, and forms a document conveyance path. This configuration will be described later in detail. Also, 27
Reference numeral denotes a document presence / absence detection sensor, which detects the presence / absence of a document via an actuator (not shown) when a document is set on the document placing tray 22.

Then, when the start key is pressed by the operator during transmission or copying, the separation roller 28 is rotated in the direction of the arrow in the figure by driving of a driving unit (not shown). Then, the originals placed on the original placing tray 22 are separated one by one by a friction piece unit 29 urged by the separation roller 28, and only the lowermost original is read by the reading means for reading the image of the original. And transferred to a contact sensor (CS) 32.

Between the separation roller 28 and the contact sensor 32, there is provided a document leading and trailing edge detecting sensor 30 for detecting the leading and trailing edges of the document via an actuator (not shown). The sensor 30 detects the leading edge of the document, and when the document reaches the reading position of the contact sensor 32,
The document is conveyed while measuring the timing so that the image of the document is accurately read.

Reference numeral 31 denotes a transport roller as a first rotating body, which is rotated in a direction indicated by an arrow in FIG.
Reference numeral 32 denotes a contact sensor as a reading unit, which is disposed at a position facing the transport roller 31 and is pressed against the transport roller 31. With this configuration, the document is prevented from floating from the contact sensor 32. In the present apparatus, the transport roller 31 is configured as a white roller because it also serves as a reading reference (white background) of the contact sensor 32.

The contact sensor 32 is held by a CS holder 33. The CS holder 33 is a rotary shaft shown in FIG.
It is rotatably held by the reading base 26 by 33c.
Between the reading base 26 and the CS holder 33, a CS spring 34 for biasing the contact sensor 32 to the transport roller 31 is provided, and biases the CS holder 32.

Reference numeral 35 denotes a transmission roller spring as a shaft support member, which is screwed to the upper document table unit 25 as an opening / closing member. In the present embodiment, a leaf spring is used as the transmission roller spring 35. Reference numeral 36 denotes a transmission roller as a transmission rotating body, which is rotatably supported by a transmission roller spring 35,
The transfer roller spring 35 presses against a discharge roller 37 as a second rotating body and a conveying roller 31 as the first rotating body, which will be described later.
To 37.

Reference numeral 37 denotes a discharge roller as a second rotating body, which is rotatably supported by the upper document table unit 25 as an opening / closing member. Reference numeral 38 (38a, 38b in FIG. 3) denotes discharge rollers, which are arranged at positions facing the respective roller portions 37a, 37b (see FIG. 4) of the discharge roller 37. 39 (39a in FIG. 3,
Reference numeral 39b) denotes a discharge roller spring which presses the discharge rollers 38a, 38b against the respective roller portions 37a, 37b of the discharge roller 37 while holding the shaft portions of the discharge rollers 38a, 38b. In the present embodiment, leaf springs are used as the discharge roller springs 39a and 39b, and the spring 39 is attached to the CS holder 33 with screws or the like.

As shown in FIG. 3, the CS holder 33 has CS holder ribs 41a, 41b, 41 as guide members.
c and 41d are integrally formed. This CS holder rib 41
Reference numerals a, 41b, 41c, and 41d are provided near the shaft portions on both sides of the discharge rollers 38a and 38b, and near both sides of the discharge roller springs 39a and 39b. Further, the CS holder rib 41a,
The guide surfaces of 41b, 41c and 41d are configured so as to be located between the original contact surface of the discharge roller 38 and the shaft support of the discharge roller 38. That is, as shown in FIG.
It is configured to be lower than the contact point (nip portion) between 37 and the discharge roller 38 and higher than the shaft support part by the discharge roller spring 39. Further, the CS holder ribs 41a, 41b, 41
The end faces c and 41d on the downstream side in the transport direction are configured to be more upstream than the end portions of the discharge rollers 38 on the downstream side in the transport direction.

With the above configuration, when the document read by the contact sensor 32 is discharged and conveyed by the discharge roller 37 and the discharge roller 38, the CS holder ribs 41a, 41b, 41c, and 41c formed integrally with the CS holder 33. 41d
As a result, the sheet is conveyed without being caught on a shaft support portion or the like by the discharge roller spring 39.

The image of the document is read by the contact sensor 32, and the trailing edge of the document is detected by the leading and trailing edge detecting sensor 30 of the document.
37 is rotated by a predetermined amount and discharged and stacked on the discharge tray 40. Also at this time, the CS holder ribs 41a, 41b, 41
By c and 41d, the trailing end of the document is discharged onto the discharge tray 40 without being left in the document conveying path and is stacked.

The discharge tray 40 is configured so as to be drawn out and stored in the facsimile apparatus main body 1.

As shown in FIG. 4, a rotary bearing 25c (the rotary bearing at the other end is not shown) is provided at both ends in the longitudinal direction (width direction) of the upper document table unit 25 as the opening / closing member. 5 and fitted on shafts (not shown) provided at both ends of the reading base 26 opposed thereto.
It can be opened and closed in any direction. Also, the upper platen unit
As shown in FIG. 4, the pressing portion 25a, 25b is provided on the 25, and when the unit 25 is opened, the CS holder 33 shown in FIG.
The pressed portions 33a and 33b are pressed to form a gap between the transport roller 31 and the contact sensor 32. The transfer roller 36 moves in a direction away from the transport roller 31 when the upper document table unit 25 is opened.
The positional relationship between the transmission roller 36 and the transmission roller 36, that is, the deflection of the transmission roller spring 35 changes, and the transmission roller 36 and the discharge roller 37 are brought into a non-contact state and released. Similarly, when the upper document table unit 25 is opened, the friction piece unit 29 and the separation roller 28 are brought into a non-contact state and are opened.

With the above arrangement, when the upper document table unit 25 is opened as shown in FIG. 5, the discharge roller 37 is brought into a non-contact state with the transmission roller 36 to be able to run idle, and the other rollers are also opened. When a document jams or the like, the document conveying path is opened simply by opening the upper document table unit 25, and the document can be removed smoothly. Also, when removing the original, no excessive load is applied to the friction transmission section (between the transport roller 31 and the transmission roller 36 and between the transmission roller 36 and the discharge roller 37), so that the rollers and rollers are prevented from being worn or damaged. can do.

[Other Embodiments] In the above embodiment,
Although the configuration in which the transmission roller 36 as the transmission rotary member is separated from the discharge roller 37 as the second rotary member when the upper platen unit 25 is opened is exemplified, the present invention is not limited to this. When the transmission roller 25 is opened, the transmission roller 36 as the transmission rotary member may be separated from the transport roller 31 as the first rotary member, or the transmission roller 36 may be separated from both rollers 31, 37. The transmission roller 36 may not be configured to transmit the driving force to the discharge roller 37 serving as the second rotating body.

In the above-described embodiment, a leaf spring that supports the transmission rotator and presses the first rotator and the second rotator while supporting the transmission rotator has been described as an example.
However, the present invention is not limited to this. For example, a configuration may be adopted in which a bearing member and a pressing member are separately provided to form the above-described bearing member (another member using a coil spring or the like).

In the above-described embodiment, an example is shown in which the present invention is applied to the transport system for transporting a document. However, the present invention is not limited to this. For example, the transport system for transporting recording paper as a sheet material The present invention is also effective when applied to the present invention.

In the above-described embodiment, the recording unit employing the ink jet system has been exemplified. However, the present invention is not limited to this. For example, an apparatus employing another recording system such as an electrophotographic system may be used. The present invention is effective.

Further, in the above-described embodiment, the facsimile apparatus is exemplified as the image processing apparatus. However, the present invention is not limited to this. For example, other apparatuses such as an electrophotographic copying machine, a laser beam printer, a scanner, and a word processor may be used. Naturally, it can be used for an image processing device.

[0041]

As described above, according to the present invention,
By opening the opening / closing member on which the second rotator and the transmission rotator are attached, the positional relationship between the first rotator and the transmission rotator (that is, the bending of the shaft support member of the transmission rotator) changes. Since the second rotator is separated, the second rotator can idle, and the jammed sheet material can be easily pulled out without being damaged. Further, it is possible to prevent abrasion and damage of a friction transmitting portion such as a roller and a roller.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing the entire structure of a facsimile apparatus to which the present invention is applied.

FIG. 2 is an external perspective view of the facsimile machine.

FIG. 3 is a perspective view showing a reading CS unit in the facsimile apparatus.

FIG. 4 is a perspective view showing an upper platen unit of a reading system in the facsimile apparatus;

FIG. 5 is an enlarged view of a reading system in the facsimile machine.

FIG. 6 is an enlarged view of a reading system (when the upper platen unit is opened) in the facsimile apparatus.

[Explanation of symbols]

 A: operation unit B: recording unit C: reading unit 1: facsimile apparatus main body 2: key 3, display unit 4: tray unit 5, middle plate 6, pressure spring 7, slider 8, auxiliary tray 9, pickup roller sensor 10 ... Edge sensor 11 ... Pickup roller 12 ... Transport roller 13 ... Pinch roller 14 ... Carriage 15 ... Recording head 16 ... Waste ink tank 17 ... Transmission roller 18 ... Discharge roller 19 ... Spur 20 ... Discharge tray 21 ... Auxiliary tray 22 ... Document loading Placement tray 22a ... Support point 23 ... Slider 24 ... Auxiliary tray 25 ... Upper document table unit 25a, 25b ... Pressing parts 25c, 25d ... Rotating bearing 26 ... Reading base 27 ... Document presence detection sensor 28 ... Separation roller 29 ... Friction piece unit 30 … Original document trailing edge detection sensor 31… transport roller 32… contact sensor 33… CS holder 33a, 33b… pressed part 33c… rotary shaft part 34… CS spring 35 Transmission roller spring 36 Transmission roller 37 Discharge rollers 37a, 37b Roller part 38 (38a, 38b) Discharge roller 39 (39a, 39b) Discharge roller spring 40 Discharge tray 41 (41a, 41b, 41c, 41d) CS Holder rib

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shigeyuki Sugiyama 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Kazuyuki Morinaga 3-30-2 Shimomaruko 3-chome, Ota-ku, Tokyo Inside the corporation

Claims (8)

[Claims] A first rotating body for conveying the sheet material and a second rotating body for conveying the sheet material;
In a sheet conveying apparatus having a rotator and a transmission rotator that presses against the two rotators to transmit the driving force of the first rotator to the second rotator, the second rotator and the transmission rotator are pivoted. A sheet conveying apparatus, wherein a supporting member to be supported is attached to the same opening and closing member that can be opened and closed with respect to the apparatus main body. 2. The sheet conveying apparatus according to claim 1, wherein the transmission rotator does not transmit a driving force to the second rotator when the opening / closing member is opened. 3. The sheet conveying apparatus according to claim 2, wherein when the opening / closing member is opened, the transmission rotator is separated from at least one of the first rotator and the second rotator. . 4. The sheet conveying apparatus according to claim 1, wherein a part of the opening and closing member functions as a conveying guide for guiding the sheet. 5. The opening and closing member according to claim 1, wherein a part of the opening and closing member functions as a conveyance guide for guiding the upper surface of the sheet material, and can be opened and closed with respect to a member for guiding the lower surface of the sheet material. The sheet conveying device according to any one of claims 1 to 3. 6. The apparatus according to claim 1, wherein the shaft support member has a function of pressing the transmission rotating body against the first rotating body and the second rotating body. The sheet material conveying device according to item 1. 7. The sheet conveying apparatus according to claim 6, wherein the shaft support member is a leaf spring. 8. An image processing apparatus having at least one image processing means such as recording means for recording an image on a sheet material such as recording paper or reading means for reading an image on a sheet material such as a document, wherein the sheet material is conveyed. An image processing apparatus comprising the sheet conveying apparatus according to any one of claims 1 to 7 as conveying means for performing the operation.