JPH08259047A - Manuscript carrying device - Google Patents

Abstract

PURPOSE: To correct skew and approach by axially shifting at least either the drive roller or driven roller arranged divided in the width direction of a manuscript and adjusting the position relation between the external peripheral surfaces of the drive roller and driven roller that are pressedly contacted with each other. CONSTITUTION: The position relation between the external peripheral surface 12a of a drive roller 12 and the external peripheral surface 15a of a driven roller 15 that are pressedly contacted with each other by varying the fixing position L of a drive gear 53 from the end section of a rotary shaft 51. The external surface 12a is formed in such a way that the external peripheral surface 12a is wider than the external surface 15a, and even if the fixing position L of the drive gear 53 is varied, the surfaces are pressedly contacted all over the surfaces with each other. Since the external surface 12a is formed into a drum shape, the external surface 15a is pressedly contacted with a taper section after adjustment, moving the document to be carried in the axial direction (arrow direction) in the large diameter side, causing skew and approach in arbitrary direction. The driven roller 15 is formed to be liable to deform with a gap 15b inside the external surface 15a, as a result, even after adjustment, the external surface 15a is pressedly contact with the external surface 12a of the drive roller 12 all over the surfaces.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a document transporting device for transporting a document to a predetermined position, for example, a document transporting device for transporting a document to an exposure position of a document reading device without causing skew or deviation.

[0002]

2. Description of the Related Art Conventionally, for example, a document feeding device mounted in a document reading device of a copying machine is known, in which images of a document passing through an exposure position are sequentially exposed and read from one end side, and the same document image is read. When is read multiple times, the exposure position is passed multiple times. This type of document feeder is roughly classified into an in-loop circulation system and a horizontal reciprocation system as a function of passing the exposure position a plurality of times.

An example of an original conveying apparatus of the circulation type in the loop is shown in FIG. This document feeder (hereinafter, referred to as a first conventional example) includes a document table 11
After the document placed and inserted on it is nipped and conveyed between the drive roller 12 and the driven roller 13 above it, the reversing roller 14 passes through the reversing path (not shown) and reverses it. The drive roller (12) and a driven roller (15) below the drive roller (12) nip and convey it to pass over the contact glass (21). Then, the drive roller 12 passes and reverses the original in an inversion path (not shown) switched by the switching claw 16 to circulate the original multiple times in the loop. In the first conventional example, since the document is circulated in the loop-shaped transport path and passed over the contact glass 21, the document transport time is not wasted and the processing capability is high.

As an example of a horizontal reciprocating document feeder, there is one shown in FIG. This document feeder (hereinafter, referred to as a second conventional example) includes a document table 11
The original inserted from above is nipped by the driving roller 12 and the driven roller 15 and conveyed as it is to pass on the contact glass 21. Then, the drive roller 12 rotates in the reverse direction and returns the original that has passed therethrough, and the original is horizontally reciprocated by repeating the forward and reverse rotations of the drive roller 12. In the second conventional example, since the document is reciprocally transported in a horizontal transport path and passed over the contact glass 21, the original cannot be exposed when the document is transported back, and the processing capability is inferior to that of the first conventional example. It is low in cost and low in cost. Reference numeral 17 is a white roller that presses the document passing on the contact glass 21.

The copying machines equipped with the first and second conventional examples are
As shown in FIG. 7 (mounting example of the second conventional example), a photoconductor that emits predetermined light from a lamp 22 to a document passing on the contact glass 21, is uniformly charged by a charging charger 24, and rotates clockwise. After the reflected light of the original image conveyed from the left to the right in the figure is guided onto the drum 23 to form an electrostatic latent image, the developing device 25 develops the electrostatic latent image to visualize it, and then the transfer charger. 26 is transferred onto the transfer paper superposed on the photosensitive drum 23, and the fixing roller 27 is heated and pressed to fix it. The transfer paper for transferring the original image is fed from the roll paper 31, conveyed by the roller 32 and the registration roller 33 between the transfer charger 26 and the transfer drum 26 in synchronization with the rotation of the photosensitive drum 23.
The paper is cut to a predetermined length according to the image by 28 and discharged to the outside of the apparatus. In FIG. 7, 34 is a lens that guides the reflected light of the original image passing on the contact glass 21 onto the photoconductor drum 23, and 35 is a separation charger that separates the transfer paper on which the visible image is transferred from the photoconductor drum 23. , 36 are the photosensitive drums 23 after transfer
Cleaning device for cleaning the surface of the
A discharging lamp for discharging the surface potential of 23, 38 is a transfer paper stacker for stocking the transfer paper cut by the cutter 28 and discharged by the fixing roller 27.

Such a first conventional example is disclosed in, for example, JP-A-60-83930, JP-A-4-172372, JP-B-62-61273, and JP-B-2-165.
16, gazette 60-177140 gazette, gazette 61-194822 gazette, or gaikaihei 3-735.
No. 51 publication. The second conventional example is disclosed in, for example, JP-A-57-83965 and JP-A-59-1.
No. 54464, JP-A-2-129669, JP-A-4-29543, JP-A-64-43349, or JP-A-4-79844.

[0007]

However, in such a conventional example, when a document is repeatedly conveyed onto the contact glass 21, there is a problem that the document is skewed or deviated at every conveyance. In order to solve this problem, in the first conventional example of the in-loop circulation system, for example, JP-A-4-172372 and Japanese Patent Publication No. 2-165.
No. 16, JP-A-60-177140, or JP-A-3-73551, there are some which are provided with means for correcting skews and deviations that occur during the conveyance of a document. . However, this correction means
Since it is complicated and costly, it can be applied to the second conventional example for providing an inexpensive copying machine, but it has not been practically carried out. However, there is a problem in that the conveyance accuracy of is low.

Therefore, according to the present invention, by correcting the skew and the deviation of the document by the driving roller and the driven roller itself for each conveyance, it is possible to correct the skew and the deviation with a simple structure, and the conveyance accuracy is excellent and the cost is low. It is an object of the present invention to provide a document feeder that can be applied to any device.

[0009]

In order to achieve the above object, the invention according to claim 1 constitutes a document conveying means by a driving roller which is rotationally driven in a predetermined direction and a driven roller which is pressed against the driving roller and driven to rotate. , A driving roller and an original feeding device for nipping and feeding an original between outer peripheral surfaces of the driving roller, wherein the driving roller and the driven roller of the original feeding means are arranged separately in the width direction of the original. The transport means is provided with adjusting means for moving at least one of the driving roller and the driven roller in the axial direction to adjust the positional relationship of the outer peripheral surfaces that are in pressure contact with each other, and the invention according to claim 2, Is characterized in that the outer peripheral surface of one of the driving roller and the driven roller has a diameter that changes symmetrically with respect to the axial center and is wider than the other outer peripheral surface. That.

Further, the invention according to claim 3 is characterized in that the document conveying means is arranged so as to be separated in the document conveying direction. The skew amount of the conveyed document caused by the original characteristics of the apparatus before adjustment is S, the deviation amount is Y, and the skew amount caused by the positional relationship between the outer peripheral surfaces of the drive roller and the driven roller. Is S0, the amount of deviation is Y0, the skew of the right leading edge and the sign of the right edge are positive, and the skew of the left leading edge and the sign of the left edge are negative, approximately S = -S0 and Y = -Y0 by the adjusting means. As described above, the positional relationship between the outer peripheral surfaces of the driving roller and the driven roller is adjusted.

According to a fifth aspect of the present invention, there is provided a conveyance path that enables the same original document to be repeatedly conveyed to a predetermined position, and the same original document is specified by passing the inside of the conveyance path. It is characterized in that it is conveyed to the position a plurality of times. Here, the diameter of the roller may be inclined in the axial direction, but it is preferable that the roller is formed so that the diameter changes symmetrically with respect to the axial center. It may or may not be larger than this.

The original characteristics of the device before adjustment are
For example, it refers to the accuracy of document transportation due to the assembling error of the document transportation means and the processing accuracy. In addition, the transportation route,
It refers to a circulation path that circulates a document or a reciprocal path that conveys a document back and forth.

[0013]

According to the first aspect of the invention, the driving roller and the driven roller of the document conveying means are arranged so as to be divided in the width direction of the document, and at least one of them is movable in the axial direction by the adjusting means and is mutually disposed. The positional relationship of the outer peripheral surface to be pressed is adjusted and held in a predetermined manner. Therefore, by shifting the positional relationship between the outer peripheral surfaces of the drive roller and the driven roller in the predetermined direction from the axial center, the load applied to the sandwiched original is not symmetrical about the axial center of the outer peripheral surface, and the original is being conveyed. It is moved in the axial direction according to the deviation. Further, since the driving roller and the driven roller are divided in the width direction of the document, the load due to the deviation of the conveyed document is evenly applied in the width direction.

According to the second aspect of the present invention, the outer peripheral surface of one of the driving roller and the driven roller is formed to have a diameter that changes symmetrically with respect to the axial center and is wider than the other outer peripheral surface. Therefore, even if the driving roller and the driven roller are displaced in the axial direction, the outer peripheral surface is reliably pressed against each other and is moved in the axial direction which is the larger diameter side when the conveyed document is displaced. Further, in the invention according to the third aspect, the document conveying means is arranged separately in the document conveying direction. Therefore, by shifting the driving roller and the driven roller in the same or different axial directions on the upstream side and the downstream side in the transport direction according to the skew or deviation of the transported document, the transported document can respond to the deviation on the upstream side and the downstream side. Moved in the axial direction.

According to the fourth aspect of the invention, the skew amount S and the deviation amount Y caused by the original characteristics of the device before adjustment, and the skew amount S0 and the deviation amount caused by the positional relationship between the outer peripheral surfaces of the driving roller and the driven roller. The positional relationship of Y0 and Y0 is adjusted by the adjusting means so that S = -S0 and Y = -Y0. Therefore, skews and deviations caused by the assembling error of the document conveying means and the processing accuracy are offset and corrected.

According to the invention of claim 5, the same document is repeatedly passed through the transport path by the document transport means and is transported to a predetermined position a plurality of times. Therefore, the skew and the deviation are corrected for each transportation.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. 1 to 4 are views showing an example of a copying machine equipped with an embodiment of a document feeder according to the present invention. In this embodiment, the same components as those in the above-described conventional example are designated by the same reference numerals and the description thereof will be omitted.

First, the structure will be described. In FIG. 1, 10
Is a document feeder installed in the copying machine 100. The document feeder 10 supports a document P placed thereon and guides it to an insertion opening 41 formed above the contact glass 21, and a document table 11. Upstream side of contact glass 21 (right side in the figure)
Reversing roller (driving roller) 14 arranged in
A driving roller 12 disposed on the downstream side (left side in the figure) of the contact glass 21 and rotating in the forward and reverse directions; and a driven roller 13 which is driven to rotate by being pressed against the reversing roller 14 from above with a predetermined pressure.
And a driven roller 15 that is driven to rotate by being pressed against each of the drive roller 12 and the reversing roller 14 from below with a predetermined pressure.
A driving roller 12, a white roller 17 pressed against the contact glass 21 with a predetermined pressure, and a document receiver 18 supporting the document P that has passed through the contact glass 21.
The reversing roller 14 and the driven roller 15 constitute a document conveying means.

In the document conveying device 10, a document P formed along the outer periphery of the reversing roller 14 and inserted through the insertion port 41.
The reverse path (conveyance path) 42 for reversing and guiding on the contact glass 21 (exposure position) and the document P formed between the document table 11 and the contact glass 21 and fed back from the reverse path 42 are inserted. An insertion path (conveyance path) 43, a reverse feed original receiver 44 that supports the original P that is reversely fed from the reverse path 42 and passed through the insertion path 43, and a conveyance path for the original P.
Alternatively, a switching claw 45 that switches to the insertion path 43, an insertion detection sensor 46 that is disposed near the insertion opening 41 and detects the leading edge of the document P that is inserted, and a document that is disposed upstream of the contact glass 21 and is conveyed. According to a registration detection sensor 47 that detects the leading edge or the trailing edge of P, a control signal from the copying machine 100 and a control program preset based on the sensor signals of the insertion detection sensor 46, the registration detection sensor 47, and the like, the drive roller 12 And a control unit (not shown) for driving and controlling the drive motor 48 and the switching claw 45. The reversing roller 14 is formed to have a larger diameter than that of the driving roller 12 in order to guide and reverse the document P in the reversing path 42.

Further, the copying machine 100 has a contact glass 2
1, lamp 22, photoconductor drum 23, transfer charger 26, fixing roller 27, cutter 28, feeding roller 32, registration roller 33, separation charger 35, transfer paper stacker 38, and paper discharge roller 39, and not shown. Electrified charger
The copying machine 100 includes a developing device 25, a developing device 25, a lens 34, a cleaning device 36, and a charge eliminating lamp 37. The copying machine 100 sets the roll paper 31 on the left side in the figure and removes the transfer paper fed from the roll paper 31. The superimposing image (original image) is transferred and fixed in synchronism with the photoconductor drum 23 that rotates counterclockwise in the figure, and then the sheet is ejected to the upper right side in the figure.
And is held by a transfer paper stacker 38 provided adjacent to the document feeder 10. The contact glass 21,
The lamp 22, the photoconductor drum 23, and the lens 34 constitute an exposure unit 49, and the charging charger 24, the developing device 25, the transfer charger 26, the separation charger 35, the cleaning device 36,
The charge eliminating lamp 37 constitutes a transfer unit 50.

In FIG. 2, reference numeral 51 denotes a rotary shaft on which the drive roller 12 or the reversing roller 14 divided into eight parts in the width direction of the document P are fixedly mounted, and the rotary shaft 51 is provided on the left and right chassis (side plates). ) 52 and the right side reinforcing plate 54 rotatably, and
It is supported so that it can move in the axial direction (thrust direction),
It is connected to a drive motor 48 via a drive gear 53 fixed at one end. This drive gear 53 is
It is sandwiched between the reinforcing plate 54 and the reinforcing plate 54 so as to be immovable in the axial direction and rotatably. The boss portion 53a is fixed to the rotating shaft 51 by screws 58 to position the rotating shaft 51 in the axial direction. Reference numeral 55 is a rotary shaft having a pair of driven rollers 15 fixed to both ends thereof. The rotary shaft 55 is a drive roller 12 and a reversing roller.
The driven rollers 15 are provided so as to correspond to each other, and the rotary shaft 55 is rotatably supported at both ends by a shaft holder 56 and the center thereof is formed by a spring (elastic member) 57 having a predetermined elastic force. Each is urged toward the corresponding drive roller 12 or reversing roller 14. These drive roller 12, reversing roller 14 and driven roller 15 are
Since the document P is reciprocally transported on the contact glass 21 by rotating in the forward and reverse directions, the outer diameter accuracy and the pressure contact balance are not uniform, and the assembling accuracy of the rotating shafts 51, 55, etc. is low.
There is a problem that the skew of the document P and the shift to the left and right become remarkable while the conveyance is repeated.

Therefore, the rotary shaft 51 is adjusted to the position shown in FIG.
As shown in (a), the driving roller 12 or the reversing roller 14
The driven roller 15 and the driven roller 15 are assembled so that the centers thereof in the axial direction coincide with each other. However, if the assembling accuracy and the processing accuracy are made high, the cost becomes high. Therefore, the skew of the document P becomes remarkable as the conveyance is repeated. The outer peripheral surface 12 that is pressed against each other by changing the fixed position L of the drive gear 53 from the end of the rotary shaft 51 and moving in the axial direction depending on the direction and degree of deviation.
The positional relationship between a and 14a and the outer peripheral surface 15a is adjusted. That is, the drive gear 53 constitutes an adjusting means for adjusting the positional relationship.

The drive roller 12 and the reversing roller 14 are
As shown in the drawing, the outer peripheral surfaces 12a and 14a are formed wider than the outer peripheral surface 15a of the driven roller 15, and the outer peripheral surfaces 12a and 14a of FIG.
As shown in (c), even if the fixed position L of the drive gear 53 is changed, the entire surface is pressed against the outer peripheral surface 12a.
Since 14b is formed in a so-called hourglass shape that changes to a larger diameter as it is separated from the axial center of the minimum diameter due to distortion such as polishing during processing, the outer peripheral surface 15a of the driven roller 15 is adjusted after the adjustment. The document P conveyed by being pressed against the taper portion is moved (moved) in the axial direction (indicated by an arrow in the drawing) on the large diameter side to generate skew or deviation in any direction. . As described above, it is generally known that the document P conveyed by the tapered roller is shifted toward the large diameter side. Further, the driven roller 15 has an outer peripheral surface 15 as shown in the drawing.
A predetermined space 15b is formed inside a so that the space is easily deformed, and the outer peripheral surface 15a is pressed against the outer peripheral surfaces 12a and 14a of the driving roller 12 and the reversing roller 14 even after the adjustment. Has become. The drive roller 12
Also, the shape of the reversing roller 14 is not limited to the processing factor, and may be processed into a drum shape having a large change in diameter, and even if the center is swollen, the moving direction of the document P is reversed. You may generate a deviation. Further, at least one of the drive roller 12 and the reversing roller 14 is made of an elastic material even if the drive roller 12 and the reversing roller 14 are not formed so as to change their diameters in the axial direction. Therefore, when the fixed position L of the drive gear 53 is changed. The outer peripheral surfaces 12a, 14a, 15a can be deformed in the radial direction to obtain the same effect.

Next, the positional relationship between the outer peripheral surfaces 12 and 14 of the drive roller 12 and the reversing roller 14 and the outer peripheral surface 15a of the driven roller 15 is adjusted by changing the fixed position L of the drive gear 53 from the end of the rotary shaft 51. Will be described with reference to FIG. 4, and the operation will also be described. Here, description will be made on the left and right with respect to the positive conveyance direction of the document P toward the image A. As shown in the right column in the figure,
As shown in the drawing, when the left preceding skew occurs, the document P rotates right with the image A surface (the back surface side in the drawing) as the front surface as the front and right sides are reversed with respect to the paper surface. The image A rotated to the right is copied (transferred) to the transfer sheet. On the contrary, when the right leading skew occurs, the document P rotates to the left (counterclockwise) and the image A rotated to the left is copied. Further, when the left side shift occurs, the document P moves to the left side, so that the image A shifted to the left side is copied onto the transfer paper, and conversely, when the right side shift occurs, the document P moves to the right side and thus the image A shifted to the right side.
Will be copied to the transfer paper. And the rotating shaft 5
The skew amount of the original P caused by the original conveying accuracy (characteristic) of the apparatus due to the assembling accuracy of 1, 55 and the processing accuracy of the rollers 12, 14, 15 is S, the deviation amount is Y, and the original P caused by the adjustment is The skew amount is S0, the shift amount is Y0, the signs of the right preceding skew amount and the rightward amount are plus, and the signs of the left preceding skew amount and the leftward amount are negative.

<When Left Leading Skew Occurs> The rotation shaft 51 of the driving roller 12 is positioned on the left side of the rotation shaft 51, while the rotation shaft 51 of the reversing roller 14 is positioned on the right side of the rotation shaft 51 of the reversing roller 14. As described above, the fixed position L of the drive gear 53 is changed and moved in the axial direction by the same amount, and due to the skew of the right front due to the positional relationship between the outer peripheral surfaces 12a, 14a and the outer peripheral surface 15a, approximately S = -S0. Is adjusted to correct the skew while confirming the amount of rotation of the image A on the transfer paper while performing copying a plurality of times.

At this time, the outer peripheral surface 15a of the drive roller 15 is
As shown in FIG. 3 (b) or FIG. 3 (c), the drive roller
12 or the outer peripheral surfaces 12a, 14a of the reversing roller 14 are displaced and pressed against the large diameter side, so that the document P is evenly loaded in the large diameter side axial direction at a plurality of positions in the width direction and the upstream side is It is moved to the right side and the downstream side is moved to the left side. Therefore, the document P is stably and effectively rotated to the left (skew to the right ahead) with each repeated conveyance, and the fixing position L of the drive gear 53 is changed so that S = -S0 approximately, and the outer peripheral surfaces 12a and 14a are changed.
By adjusting the positional relationship between the outer peripheral surface 15a and the outer peripheral surface 15a, the skew generated before the adjustment is canceled and corrected. Since the correction is performed by substantially the same operation also in the following, this description will be omitted below.

<When Right Leading Skew Occurs> As in the case of left leading skew, left leading skew is generated by reversing the axial movement of the rotation shaft 51 of the drive roller 12 and the reversing roller 14. Then, the skew is corrected so that S = -S0. <When leftward shift occurs> The rotation shaft 51 of the drive roller 12 and the reversing roller 14 is moved by the same amount in the axial direction by changing the fixed position L of the drive gear 53 so that the driven roller 15 is located on the right side, and the outer circumferences thereof. By adjusting the position of the surfaces 12a, 14a and the outer peripheral surface 15a to the right, it is adjusted so that Y = −Y0, and while making multiple copies, for example, while checking the amount of movement of the image A on the transfer paper, the deviation is made. to correct.

<When rightward shift occurs> Similar to the leftward shift, the leftward shift is generated by reversing the axial movement of the rotary shaft 51 of the drive roller 12 and the reversing roller 14 to generate a leftward shift, and approximately Y =-
Correct the deviation so that it becomes Y0. <When skew and deviation occur> Although not shown, after the fixed position L of the drive gear 53 is moved in the axial direction of the rotary shaft 51 of the drive roller 12 and the reversing roller 14 in a direction to correct the skew, Further, the rotation shaft 51 is moved in the direction of correcting the deviation and moved to change it, that is, the change amount of the fixed position L of the drive gear 53 that moves the rotation shaft 51 in the axial direction is different between the drive roller 12 and the reversing roller 14. Differently, the skew and the deviation due to the positional relationship between the outer peripheral surfaces 12a and 14a and the outer peripheral surface 15a are generated, and approximately S = -S0, and
Skew and deviation are corrected while making a plurality of copies so that, for example, the rotation amount and the movement amount of the image A on the transfer paper are confirmed so that Y = -Y0.

Next, the conveyance of the original P and the transfer paper will be described together with the operation. The drive roller 12 and the reversing roller
Although 14 is driven and stopped at the same time, only one may be omitted for convenience of description. First, the document P is placed on the document table 11 with the image A as the upper surface, inserted through the insertion port 41, and when the leading end is detected by the insertion detection sensor 46, the reversing roller 14
Rotates in the forward rotation direction (clockwise in FIG. 1), and the original P is nipped and conveyed between the reverse roller 14 and the driven roller 13 and is passed through the reverse path 42. At this time, the switching claw 45 is used for the document P.
It is located so that the transport path of the above is used as the insertion port 41. Then, the original P is passed through the reversing path 42 to form the image A.
Is inverted so that it is on the lower surface side, and is nipped and conveyed between the reversing roller 14 and the driven roller 15. When the registration detection sensor 47 detects the leading edge of the document P, the reversing roller 14
Rotation is stopped and conveyance is temporarily stopped. in this way,
Since the original P is inverted by the inversion path 42 and passed over the contact glass 21, it can be placed on the original table 11 with the image A as the upper surface, and the image A of the original P can be easily confirmed. it can.

Next, the transfer paper is unwound from the roll paper 31 by the unwinding roller 32 and is conveyed between the photosensitive drum 23 and the transfer charger 26 by the registration roller 33, and a predetermined timing is set so as to be synchronized with this transfer paper. The drive roller 12, the reversing roller 14 and the photoconductor drum 23 are rotated to expose the image A of the original P passing through the contact glass 21 from the leading end side, and the transfer paper is the image A of the original P. After being transferred and heated and pressed by the fixing roller 27 to fix the visible image, it is conveyed to the paper discharge roller 39, discharged to the outside of the machine, and held by the transfer paper stacker 38. Further, the original P passes through the contact glass 21 and is then sandwiched between the driving roller 12 and the driven roller 15 to receive the original 18.
When the sheet is exposed to the upper side and is exposed once, the sheet is directly discharged onto the document receiver 18.

In the case of a plurality of exposures, after the registration detection sensor 47 detects the trailing edge of the original P, the drive roller 12 is stopped at a predetermined timing and the original P drives the trailing edge. It is stopped at the position sandwiched between 12 and the driven roller 15. Next, the transport path of the document P is switched from the insertion port 41 to the insertion path 43 by the switching claw 45, and the drive roller 12 and the reversing roller 14 rotate in the reverse direction at twice the forward direction, so that the document P Reversed by being conveyed in the opposite direction
After being reversed at 42, it is inserted into the insertion passage 43 and received backward
It is transported and supported on 44. Next, when the registration detection sensor 47 detects the leading edge of the document P, the driving roller 12 and the reversing roller 14 are stopped and the leading edge of the document P is reversed by the reversing roller 14.
It is stopped at the position where it is nipped between the driven roller 15 and the driven roller 15.
As described above, when the document P is conveyed in the reverse direction, the driving roller 12 and the reversing roller 14 rotate in the reverse direction at a speed twice as fast as the forward direction and convey the document P onto the reverse document receiver 44. It is possible to shorten the operation time only for carrying, and shorten the processing time for exposing a plurality of times.

Next, the above-described reciprocating conveyance of the original P and the conveyance of the transfer paper are repeated, the image A of the same original P is exposed a predetermined number of times, and a plurality of transfer papers form the same image A. The document P that has been exposed and has been stocked in the transfer paper stacker 38 is discharged onto the document receiver 18. Then, when there is a document P to be exposed next, the document P is placed on the document table 11 with the image A as the upper surface and kept waiting, and the leading end of the document is detected from the insertion opening 41 by the insertion detection sensor 46. The same operation is repeated continuously by inserting to the position. In this way, the original table 11, the original receiver 18, and the reverse-feed original receiver 44 are arranged on the left side in the figure, and the original P is inverted and conveyed back and forth on the contact glass 21, so that the transfer paper is placed on the rear side. The transfer sheet stacker 38 can be discharged from the upper part of the apparatus to the outside adjacent to the rear side of the document conveying apparatus 10, and the document P and the transfer sheet can be collected from the same work position, for example, a wide sheet. When processing the document P, the document P and the transfer paper can be collected from the front side of the operation unit provided on the left side in FIG. When the image of the original document P is exposed a plurality of times, the original document P is switched from the insertion path 41 to the insertion path 43 so that the original document table is moved.
11 The document table is fed back and forth without returning to the top.
The next original P can be placed on the stand-by on 11 and can be continuously conveyed.

At this time, in the reciprocally conveyed original P, the skew S and the deviation Y caused by the assembling accuracy and the processing accuracy of the original conveying apparatus 10 are offset by the skew S0 and the deviation Y0 of the original P caused by the adjustment and corrected. Therefore, it is accurately conveyed back and forth and passed over the contact glass 21. Thus, in this embodiment, the outer peripheral surfaces 12a and 14a
A drive roller 12 and a driven roller 14 each having a drum shape and wider than the outer peripheral surface 15a of the driven roller 15 are divided in the width direction of the document P and fixedly mounted on the rotation shaft 51, and the rotation shaft 51.
Is arranged on the upstream and downstream sides of the contact glass 21 so as to be movable in the axial direction by changing the fixed position L of the drive gear 53, so that the skew of the document P which becomes remarkable by a plurality of conveyances and the skew of the document P can be noticed. Slightly S = -S0 and Y
By adjusting the positional relationship between the outer peripheral surfaces 12a, 14a and the outer peripheral surface 15a by changing the fixed position L of the drive gear 53 so that the outer peripheral surface 12 becomes equal to -Y0, the outer peripheral surface 12 is provided at a plurality of positions in the width direction on the upstream and downstream sides of the document P.
The load of a and 14a in the axial direction on the large diameter side can be added and moved for each conveyance, and skews and deviations caused by assembling errors and processing accuracy can be canceled out effectively and stably and easily. Can be corrected. Therefore, even if the same document P is repeatedly conveyed, skew and deviation are not accumulated, and the conveyance accuracy is excellent, and the positional relationship between the drive roller 12, the driven roller 14 and the driven roller 15 is simply shifted in the axial direction. Thus, it is possible to provide an inexpensive document feeder 10.

In this embodiment, the drive roller is moved in the axial direction to adjust the positional relationship with the driven roller. However, the driven roller is reversely moved in the axial direction, and both the drive roller and the driven roller are adjusted. It goes without saying that it may be configured to move in the axial direction to adjust these positional relationships. Further, since the skew and the deviation of the document are corrected while being conveyed, the skew and the deviation are corrected even in one conveyance, and the skew and the deviation become remarkable by conveying the same document a plurality of times, so that the conveyance is repeated. Application to a device having a function is preferable. Further, not only the reciprocating type, but the same effect can be obtained even when applied to a circulating type document conveying device.

[0035]

According to the first aspect of the invention, the positional relationship between the outer peripheral surfaces of the driving roller and the driven roller, which are divided in the width direction of the original, and which are in pressure contact with each other, can be adjusted and held in the axial direction. By shifting the positional relationship of these outer peripheral surfaces from the center in the axial direction, it is possible to apply a load to the document in the axial direction according to the deviation at a plurality of positions in the width direction, and to move the document in the axial direction while conveying the document. . Therefore, the skew and the deviation generated when the adjustment is not performed can be easily corrected by a simple configuration in which the positional relationship of the rollers is shifted in the axial direction. As a result, it is possible to provide a document conveying device which is excellent in document conveying accuracy and is inexpensive and can be applied to any device.

According to the second aspect of the present invention, the outer peripheral surface of the drive roller or the driven roller has a diameter that changes symmetrically with respect to the axial center and is formed wider than the other outer peripheral surface. The outer peripheral surfaces of the roller and the driven roller can be reliably pressed against each other, and the conveyed document can be moved in the axial direction, which is the larger diameter side when the positional relationship of the rollers is displaced from the axial center. Therefore, skew and deviation can be effectively corrected.

Further, according to the third aspect of the present invention, since the driving roller and the driven roller divided in the width direction of the document are arranged on the upstream side and the downstream side in the document transport direction, respectively, skew of the transported document and By shifting the positional relationship of the rollers in the same or different axial directions on the upstream side and the downstream side according to the deviation, it is possible to move the conveyed document on the upstream side and the downstream side in the axial direction according to the deviation. Therefore, skew and deviation can be corrected more effectively.

According to the fourth aspect of the invention, the positional relationship between the outer peripheral surfaces of the driving roller and the driven roller is adjusted so that the conveyed document moves in a direction opposite to the skew and deviation due to the original characteristics of the apparatus before adjustment. Therefore, it is possible to cancel and correct the skew and the deviation caused by the assembly error and the processing accuracy. Further, according to the fifth aspect of the invention, since the skew and the deviation of the conveyed original are corrected every time the original is conveyed to the predetermined position, there is no accumulation of the skew and the deviation even if the same original is repeatedly conveyed to the predetermined position. The carrying accuracy is improved when carrying a plurality of times.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an example of a copying machine equipped with an embodiment of a document feeder according to the present invention, and is a side view thereof.

FIG. 2 is a partial cross-sectional view showing a main part thereof.

3 is an enlarged partial cross-sectional view of a main part of FIG.

FIG. 4 is an explanatory diagram illustrating the adjustment of the main part.

FIG. 5 is a schematic configuration diagram showing a first conventional example thereof.

FIG. 6 is a schematic configuration diagram showing a second conventional example thereof.

FIG. 7 is a schematic configuration diagram showing a document reading device equipped with a second conventional example.

[Explanation of symbols]

 10 document transport device 11 document table 12 drive rollers (document transport means) 12a, 14a, 15a outer peripheral surface 14 reversing roller (drive roller, document transport means) 15 driven roller (document transport means) 18 document receiver 21 contact glass (predetermined position ) 41 Insertion port 42 Reverse path (conveyance path) 43 Insertion path (conveyance path) 44 Reverse feed document receiving 45 Switching claw 49 Exposure section 50 Transfer section 51 Rotating shaft 53 Drive gear (adjusting means) 100 Copier P Original S, S0 Skew amount Y, Y0 deviation amount

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location G03G 15/00 107 G03G 15/00 107

Claims (5)

[Claims] 1. An original conveying means is constituted by a drive roller which is rotationally driven in a predetermined direction and a driven roller which is pressed against the drive roller and is driven to rotate, and an original is sandwiched between the drive roller and the outer peripheral surface of the drive roller. In a document transporting device for transporting, the drive roller and the driven roller of the document transporting means are arranged separately in the width direction of the document, and at least one of the drive roller and the driven roller is moved in the axial direction by the document transporting means. An original conveying device, which is provided with adjusting means for adjusting a positional relationship between outer peripheral surfaces that are pressed against each other. 2. The transport according to claim 1, wherein the outer peripheral surface of one of the drive roller and the driven roller has a diameter that changes symmetrically with respect to the axial center and is wider than the other outer peripheral surface. apparatus. 3. The document conveying apparatus according to claim 1, wherein the document conveying means are arranged separately in the document conveying direction. 4. A skew amount of a conveyed document caused by the original characteristics of the apparatus before adjustment is S and a deviation amount is Y, and a skew amount caused by the positional relationship between the outer peripheral surfaces of the driving roller and the driven roller is S0, and the deviation amount. Is Y0, the right leading skew and the sign to the right are plus, and the skew leading to the left and the sign to the left are minus, the drive roller and the driven roller are controlled by the adjusting means to be approximately S = -S0 and Y = -Y0. 4. The document feeder according to claim 1, wherein the positional relationship of the outer peripheral surface of the roller is adjusted. 5. A transport path is provided which enables repeated transport of the same document to a predetermined position, and the document transport means transports the same document to a predetermined position a plurality of times by passing a sheet through the transport path. The document feeder according to any one of claims 1 to 4, which is characterized in that.