JP3913406B2 - Document feeder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a document feeding device, and more particularly, to a document feeding device that can effectively curl even a curled document.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there has been known a document feeder that separates and feeds documents set on a sheet feed table one by one and continuously conveys them to a processing position by the apparatus main body. For example, it is mounted on a document reading device or mounted on a facsimile machine or a copying machine.
[0003]
As shown in FIGS. 12 and 13, this type of document feeder includes a sheet feed table 11 on which a plurality of documents P to be processed can be placed (set). For example, when the filler 12 is pushed by the set document P and deviates from the detection position of the sensor S1, the filler 13 is detected by rotating the leading end with the upstream side in the paper feeding direction as a fulcrum by a stepping motor (not shown). Ascending from the home position (standby position) detected by S2.
[0004]
At this time, when the cam 14 rotates and the one rotating lever 15a protruding to both sides rises, the roller holding member 16 formed with the flange portion 16a supported by the other rotating lever 15b has its own weight. The roller holding member 16 is lowered so that the filler roller 17 is removed from the detection position of the sensor S3 and the call roller 18 that is rotatably held is fed. It is pressed against the upper surface of the document P on the paper table 11.
[0005]
Then, when the roller holding member 16 is raised at the leading end as the paper feed table 11 is raised and the filler 17 is detected again by the sensor S3, the original table 11 stops rising. The calling roller 18 presses and rotates on the upper surface of the original P on the paper supply table 11 at a proper paper supply position detected by the sensor S3, thereby sending the original P downstream in the paper supply direction. Note that after the feeding of the original P is finished, the paper feeding table 11 is lowered and returns to the home position where the filler 13 is detected by the sensor S2.
[0006]
A pair of side fences (side members) 19 provided so that at least one of them can be slid in the width direction of the original P is arranged on the paper feed table 11 along both sides of the original P to be set. The originals P to be set can be aligned.
[0007]
[Problems to be solved by the invention]
In such a conventional document feeding device, the document P on the sheet feeding table 11 is sent out by the calling rollers 18 arranged at one place or a plurality of places. In addition, it is difficult and usually only one of the side fences 19 is slidable, so that the calling roller 18 does not become a center reference located at the center of the document P in the width direction. For this reason, the document P is shifted to the back side or the near side on the paper feed table 11 depending on the size, and when it is sent out by the calling roller 18, the rotation (skew) of the back side preceding or the near side preceding is performed. try to.
[0008]
The skew of the original P is prevented by the side fence 19 coming into contact with the side of the original P and restricting the rotation. However, when the original P has a curl, the side of the original P only with the side fence 19. It is difficult to effectively limit the rotation even if it abuts on the surface. For this reason, a document pressing member (curl pressing member) 20 is provided on the inner side of each side fence 19 so as to protrude in parallel from the upper surface of the sheet feeding table 11 (the surface on which the document P is placed). A further curling of the document P curled by the pressing member 20 is limited so that the rotation of the document P can be effectively limited by the side fence 19.
[0009]
However, in the conventional document feeder, the document pressing member 20 is provided integrally with the side fence 19 at a position spaced apart from the document P placement surface of the sheet feed table 11 by a certain distance. As shown in FIG. 14, when the ascent of the paper feed table 11 stops at the proper paper feed position, the stop position of the calling roller 18 with respect to the apparatus main body side is substantially constant at the height h. The moving angle varies depending on the thickness of the set document P.
[0010]
For this reason, the distance from the upper surface of the document P to the document pressing member 20 is wide as shown in FIG. 14A when the number of documents P is small, while as shown in FIG. 14B when the number of documents P is large. The interval t2 is very narrow.
[0011]
Therefore, in such a document pressing member 20, the curled document P can be effectively pressed and restricted in rotation at a narrow interval t2, but the curled document P can be freely set at a wide interval t1. There has been a problem that there is a risk that the rotation may occur and the rotation cannot be limited, and skew may occur.
[0012]
In order to solve this problem, it is conceivable that the document pressing member 20 is brought close to the placement surface of the document P of the paper feed table 11, but in this case, the number of documents P that can be set is reduced. In addition, there is a problem that it is difficult to set the document P.
[0013]
Further, a plurality of protrusions are erected on the inner side surface of the side fence 19 that aligns both sides of the document P to be set. (Registered trademark) It is conceivable to limit the curling of the original P to be curled further by sticking one side of the original P so that the side of the original P is bitten. Since it is in a state of projecting from the side surface, it interferes when the document P is set on the document table 11 and becomes a load when the document P is separated and fed. There is a risk of damage.
[0014]
Therefore, the present invention effectively suppresses the curling of the originals regardless of the number of the originals so that the rotation of the originals can be reliably controlled, and the originals can be fed to the processing position of the apparatus body with high quality. The purpose is to. In addition, since it is considered that the skew of the document is caused by the load that slides on the document presser, it is advantageous to reduce the load.
[0015]
[Means for Solving the Problems]
A first invention that solves the above-described problems is a paper feed table on which a document is placed, a side member that abuts on a side of the document on the paper feed table and restricts rotation of the document, and a paper feed table that faces the paper feed table. And a curl pressing member that restricts the document on the sheet feed table from being curled more than a certain amount, and separates and feeds the documents on the sheet feed table one by one and conveys them to the processing position of the apparatus main body. A paper feeding device, wherein the distance between the curl pressing member and the paper feeding table facing each other is changed to change the upper surface of the original on the paper feeding table and the curl pressing member. And bring them close together This is characterized in that there is provided an interval adjusting means for making the interval of the above constant.
[0016]
In the present invention, the distance between the curl pressing member and the paper feed table is changed according to, for example, the number of originals set, and the upper surface of the original on the paper feed table and the curl press member And these are brought close together The interval is made constant. Therefore, the curl of the original on which the curl pressing member is set can be surely pressed regardless of the number of originals set, and the side member can effectively prevent the separately fed original from rotating. Can be restricted.
[0017]
In addition to the configuration of the first aspect of the invention, the second invention for solving the above-mentioned problem is that the curl holding member is fixed to the apparatus main body side and is relative to a paper feed table that is moved up and down by a driving means. The distance adjusting means detects that the distance between the upper surface of the document on the sheet feeding table adjacent to the curl pressing member and the curl pressing member is constant, The drive means is stopped.
[0018]
According to the present invention, when the distance between the paper feed table that is raised to separate and feed the document is close to the upper surface of the document in the vicinity of the curl pressing member fixed to the apparatus main body side, the movement is performed. Is stopped. Therefore, the distance between the curl pressing member and the paper feeding table facing each other can be changed according to the number of originals set by using the driving of the paper feeding table, and the distance between the upper surface of the original on the paper feeding table and the curl pressing member can be changed. The interval can be made constant.
[0019]
In addition to the configuration of the first invention, a third invention for solving the above-described problems is configured to hold the curl pressing member so as to be able to contact and separate with respect to a paper feed table that moves up and down by a driving means. There is provided a member holding means for holding the paper feed table that moves at the start of the paper operation so as to be close to the paper feed table. It is characterized in that the driving means is stopped upon detecting that the interval between them has become constant.
[0020]
According to the present invention, the curl holding member stands by at a position separated from the paper feed table, and the relative position is brought closer to the upper surface of the document as the paper feed table moves, so that the distance from the upper surface of the document becomes constant. The movement of the paper feed table is stopped. Therefore, the distance between the curl pressing member and the paper feed table can be changed according to the number of originals set, and the distance between the upper surface of the original on the paper feed table and the curl pressing member can be made constant.
[0021]
According to a fourth invention for solving the above problem, in addition to the configuration of the third invention, the member holding means maintains the posture in which the curl pressing member faces the paper feed table in parallel. It is characterized by being held so as to be able to contact and separate.
[0022]
In this invention, the curl holding member can be brought close to the paper feed table from the standby position while maintaining a posture facing the paper feed table in parallel. The interval can be made constant. Therefore, it is possible to suppress the curling of the document with a large area.
[0023]
According to a fifth invention for solving the above-mentioned problems, in addition to the configuration of any of the first to fourth inventions, when the curl pressing member comes into contact with a document on a paper feed table, the document rotates in the document transport direction. A rotating member is provided.
[0024]
In the present invention, even when the document to be fed comes into contact, the rotating member of the curl pressing member is driven to rotate (may be driven to rotate at the transfer speed) in the document transfer direction. Therefore, a load that restricts the transfer of the fed document is not given.
[0025]
According to a sixth aspect of the present invention for solving the above-described problems, a paper feed table for placing a document, a side member that abuts on a side of the document on the paper feed table and restricts rotation of the document, and faces the paper feed table And a curl pressing member that restricts the document on the sheet feed table from being curled more than a certain amount, and separates and feeds the documents on the sheet feed table one by one and conveys them to the processing position of the apparatus main body. The paper feeding device includes support means for supporting a plurality of the curl pressing members adjacent to each other in the document stacking direction, and the support means is configured to support the curl pressing member on the side of the document positioned laterally. Supports the side member so that it can be retracted by being pushed by the side, while projecting from the side of the side member to face the document on the paper feed table and pressing the curl of the document when there is no document on the side Also characterized by It is.
[0026]
In this invention, the curl holding member at a position less than the original stacking thickness is pushed by the side of the original and retracted into the side member, and the curl holding member located above the original is It protrudes from the side surface of the side member so as to press the curl and faces the upper surface of the document. Therefore, the curl of the original on which the curl pressing member is set can be surely pressed regardless of the number of originals set, and the side member can effectively prevent the separately fed original from rotating. Can be restricted.
[0027]
In addition to the configuration of the sixth invention, a seventh invention for solving the above-described problems is a support member in which a plurality of curl pressing members are juxtaposed as a supporting means and accommodated in a side member together with the curl pressing member; A curl presser setting means for moving the support member and projecting the curl presser members integrally from the side members or accommodating the curl presser members in the side members; When setting, the support member is moved so that the curl pressing member is accommodated in the side member.
[0028]
In the present invention, a plurality of curl pressing members are supported by a support member that can be accommodated in the side member, and the curl pressing members are moved together with the support member so that when the document is set on the paper feed table, While being accommodated in the member, it protrudes from the side surface of the side member when the document is fed. Therefore, even when a plurality of curl pressing members are juxtaposed in the document stacking direction, the document setting is not hindered.
[0029]
According to an eighth aspect of the present invention for solving the above-mentioned problems, in addition to the configuration of the seventh aspect, the curl presser setting means is configured to place the curl presser member in the side member when a jam occurs in the separated and fed document. The support member is moved so as to be accommodated.
[0030]
In the present invention, the curl pressing member is accommodated in the side member even when a jam of the fed document occurs. Therefore, even if a plurality of curl pressing members are juxtaposed in the document stacking direction, it does not hinder the document setting after the jam is eliminated.
[0031]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described with reference to the drawings. 1 to 5 are views showing a first embodiment of a document feeding device according to the present invention mounted on a copying machine, and this embodiment corresponds to the first and second inventions. In the present embodiment, the same components as those in the above-described conventional technology will be denoted by the same reference numerals, and description will be made focusing on the characteristic portions.
[0032]
In FIG. 1, the copying machine can continuously feed a plurality of documents P set on a document reading device 100 that reads an image of a document P located at a reading position (processing position) and a sheet feeding table 11 to the reading position. An original document feeder 10, and for example, an image forming apparatus (not shown) that employs an electrophotographic recording method is used to record toner and copy it. Light is irradiated from the light source 103 onto the original P set at the reading position where the rear end abuts on the original scale 102 on the contact glass 101, and the reflected light is polarized by the mirror 104 and taken into a reading element such as a CCD. By performing photoelectric conversion, the image of the original P is scanned and read in the main scanning direction, and the scanner unit including the light source 103 and the mirror 104 is sub-scanned. By traveling in direction, so that the scanning and reading an image of original P in the sub-scanning direction. Note that the paper feed table 11 is provided with an extended portion 11 a that is extended upstream in the paper feed direction and fixed so as not to rotate, so that even a large-size document P can be placed thereon.
[0033]
In the document feeder 10, the sheet feed table 11 on which the document P is loaded (set) is lifted by rotating the front end side, while the cam 14, the rotation lever 15a, The roller holding member 16 is rotated by its own weight by 15b to lower the calling roller 18 on the tip side, and the filler 17 of the roller holding member 16 is once again detected after being removed from the detection position of the sensor S3. When the proper feeding position is reached, the ascent of the feeding table 11 is stopped and the calling roller 18 that presses against the upper surface of the original P on the feeding table 11 is rotated to feed the original P. Send out downstream in the paper direction. In the bundle of documents P that have been sent out, the separation roller 21 that rotates in the direction opposite to the feeding direction prevents the feeding of the lower layer document P, while the separation belt 22 driven in the feeding direction moves the uppermost document P downstream. Pull out one by one and feed it separately.
[0034]
Thereafter, the document feeder 10 feeds the separated and fed document P between the feeding roller pair 23 and the registration roller pair 24 to the conveying belt 25, which conveys the conveying belt 25 to the contact glass 101. The document P is set at a reading position where the trailing edge of the document scale 102 abuts against the document scale 102. The document P, which has been read by the document reading device 100, is resumed from the contact glass 101 by restarting the driving of the conveying belt 25. Paper is discharged onto the paper discharge tray 26.
[0035]
Note that the document feeder 10 feeds the document P, which is transported from the contact glass 101 by the transport belt 25, onto the discharge tray 26 as it is, or is turned over onto the contact glass 101 and transported again. A reverse paper discharge mechanism 30 is provided for switching whether to discharge paper onto a paper discharge tray (not shown) below the paper table 11. The reverse paper discharge mechanism 30 includes drive rollers 31 and 32 and drive rollers. 31 and the driven rollers 33 and 34 for conveying the original P carried out from the contact glass 101 in contact with the contact glass 101 onto the contact glass 101 or the paper discharge tray 26, and the original P carried out from the contact glass 101. Switching claw 35 for switching the destination of the paper to either the paper discharge tray 26 side or the reverse conveyance side, and the document sent to the reverse conveyance side A switching claw 36 for switching the destination of the paper to either the contact glass 101 or the paper discharge tray below the paper feed table 11 and the original P sent to the paper discharge tray side below the paper feed table 11. A pair of paper discharge rollers 37 for discharging paper upward.
[0036]
The document feeder 10 also includes a feed stepping motor for separating and feeding the document P, a transport stepping motor for transporting and unloading the document P on the contact glass 101, and a discharge stepping for inverting and ejecting the document P. Each of the motors is driven independently, and the original P on the contact glass 101 is discharged and then the next original P is fed, or a plurality of originals P are arranged on the contact glass 101. In addition, it is possible to arbitrarily change the distance between the arranged originals P.
[0037]
In addition to the sensors S1 to S3, the document feeder 10 includes a document set sensor S4 that detects the setting of the document P, a first sheet feed sensor S5 that detects the presence of the document P in the separation unit, and a jam of the document P. Various sensors such as second and third paper feed sensors S6 and S7 for length detection, a carry-out sensor S8 for detecting the original P carried out from the contact glass 101, and a reverse sensor S9 are arranged. The length information of the original P detected based on the detection signals of the second and third paper feed sensors S6 and S7 is the original length when the original P is conveyed / stopped on the contact glass 101 for image reading. Stored in the storage memory (if there is only one document P on the contact glass 101, it will be stored in the first storage memory, if it is two, it will be stored in the second storage memory, if it is three, it will be stored in the third storage memory (hereinafter the same) ) Memories) and Hara Each time the discharge of P is completed, the contents of the second storage memory are stored in the first storage memory, and the contents of the third storage memory are stored in the second storage memory (hereinafter the same), so that the original P is discharged. During the paper operation, the pulses of the conveyance stepping motor are counted, and the conveyance belt 25 conveys the contact glass 101 on the contact glass 101 with a feed amount corresponding to the document P. Similarly, in the reverse paper discharge mechanism 30, the carry-out sensor S8 detects the jam of the original P and the discharge deceleration timing, and the stepping motor pulse after the leading edge of the original P passes through the carry-out sensor S8 is detected. By counting, the feed amount of the document P after passing the sensor can be known.
[0038]
Then, the document feeder 10 tries to rotate the document P, which is pulled out from the sheet feeding table 11 by the calling roller 18, the separation roller 21, and the separation belt 22 and separated and fed, by the side fence (side member) 19. When the document P is curled when guiding the sheet, the document pressing member (curl pressing member) 40 facing the sheet feeding table 11 inside the side fence 19 is on the lower surface side. Further curling is suppressed so that the rotation limitation by the side fence 19 can be reliably performed regardless of the number of documents P.
[0039]
In this embodiment, the document pressing member 40 provided on the fixed side of the side fence 19 is separated from the side fence 19 by bending the upper portion of the support plate 42 fixed to the stay member 41 that holds the paper feed table 11. It is formed on the body, and is fixed to the apparatus main body side so as to be movable relative to the paper feed table 11 in the vertical direction. According to this configuration, as shown in FIGS. 4 and 5, the document pressing member 40 is in a positional relationship with the calling roller 18 positioned at the appropriate feeding position where the filler 17 of the roller holding member 16 is detected by the sensor S3. Can be kept constant, and when the document P is fed, the distance t3 from the top surface of the document P on the sheet feed table 11 with which the calling roller 18 is pressed can always be kept constant. .
[0040]
Note that the support plate 42 is located in a recessed portion 43 formed on the inner surface side of the side fence 19 and constitutes a part of the inner surface of the side fence 19, and functions of the side fence 19 that regulates the side of the document P. It is arranged so as not to damage. In the present embodiment, the document pressing member 40 is fixed to the apparatus main body only on the fixed side of the side fence 19, but the support plate 42 is slidably attached to the stay member 41 on the moving side, for example, It goes without saying that the portion that supports the document pressing member 40 may be configured to pass through the slit provided in the paper feed table 11 and move together with the side fence 19 (also in other embodiments described below). The same).
[0041]
Therefore, by fixing the document pressing member 40 on the apparatus main body side, the filler 17 of the roller holding member 16 is detected by the sensor S3 so that the calling roller 18 that is in pressure contact with the upper surface of the document P is positioned at the proper feeding position. When the sheet feed table 11 stops rising, the distance of the document pressing member 40 facing the sheet feed table 11 changes according to the thickness of the document P, and the interval t3 with respect to the upper surface of the document P on the sheet feed table 11 is changed. Can be adjusted to a constant state, and when feeding the original P, regardless of the thickness of the original P, the curl of the original P on which the original pressing member 40 is set is suppressed, The side fence 19 can effectively restrict the original P drawn to the calling roller 18 or the like from being rotated.
[0042]
That is, by fixing the document pressing member 40 to the apparatus main body side, the interval adjusting means can be configured by using the filler 17 of the roller holding member 16 and the sensor S3, and this embodiment is easily constructed. be able to.
[0043]
As described above, in this embodiment, when the document pressing member 40 is fixed to the apparatus main body side, when the ascending paper feed table 11 stops at the timing when the calling roller 18 is positioned at the proper paper feed position, The distance at which the pressing member 40 faces the paper feed table 11 is adjusted (changed) according to the number of originals P set, and the original P with the distance t3 from the upper surface of the original P on the paper feed table 11 kept constant. The sheet feeding operation can be executed. Therefore, the curl of the original P can be reliably suppressed regardless of the number of the originals P set, and the original P can be fed on the contact glass 101 of the original reading apparatus 100 with high quality without being skewed. .
[0044]
Next, FIGS. 6 to 8 are views showing the main part of the second embodiment of the document feeder according to the present invention mounted on a copying machine. This embodiment corresponds to the third and fourth inventions. To do. In the present embodiment, the same components as those in the above-described embodiment will be denoted by the same reference numerals, and description will be made focusing on the characteristic portions.
[0045]
6 and 7, the document pressing member 50 is formed by bending the upper portion of the support plate 54 formed in a similar shape to the recessed portion 53 provided in the side fence 19 in the present embodiment. The support plate 54 is fitted so as to be movable in the vertical direction in a state where the lower portion of the support plate 54 is located below the upper surface of the paper feed table 11 (the surface on which the document P is placed).
[0046]
The support plate 54 is movable in the vertical direction as a part of the side fence 19 without being separated from the recess portion 53 by a pair of guide rails 55 and 56 provided on the opposing surfaces of the recess portion 53. It is held and guided, and is urged upward by a compression spring 59 interposed between spring holders 57 and 58 provided on the opposing surfaces thereof.
[0047]
Accordingly, the document pressing member 50 can move in the vertical direction as the support plate 54 moves while maintaining a posture facing the paper feed table 11 in parallel.
[0048]
Further, in the recessed portion 53 of the side fence 19, a stop plate 52 is provided separately from the side fence 19 fixed to the stay member 41 that holds the paper feed table 11 and the upper portion 52 a is bent in the direction of the support plate 54. Is arranged, and the baffle plate 52 moves relative to the sheet feeding table 11 moving in the vertical direction, and the lower surface of the upper portion 52a is on the upper surface of the lateral rib 50a provided on the back surface side of the document pressing member 50. After the contact, the movement of the support plate 54 (document pressing member 50) with respect to the apparatus main body is stopped.
[0049]
Therefore, when the paper feed table 11 is positioned at the home position (standby position) where the filler 13 is detected by the sensor S2, the upper portion 52a of the stopper plate 52 is supported by the support plate 54 as shown in FIG. Since the support plate 54 is urged by the compression spring 59, the document pressing member 50 is positioned at the uppermost portion (standby position) of the recess 53. Therefore, the document P can be easily set with a large gap between the document pressing member 50 and the paper feed table 11.
[0050]
When the original P is set, the paper feed table 11 starts to rise from the home position while the calling roller 18 is pressed against the upper surface of the original P on the paper feed table 11. When 50 a is hit by the upper part 52 a of the stop plate 52, the support plate 54 is fixed relative to the apparatus main body against the elastic force of the compression spring 59.
[0051]
Accordingly, similarly to the above-described first embodiment, the calling roller 18 is positioned at an appropriate feeding position corresponding to the thickness of the document P while changing the distance of the document pressing member 50 facing the sheet feeding table 11. When the paper feed table 11 is stopped, as shown in FIG. 8B, the document pressing member 50 is adjusted to have a constant interval t3 with respect to the upper surface of the document P on the paper feed table 11 and is parallel to the upper surface. The document P can be fed in a state of facing the document. Therefore, regardless of the thickness of the document P, the document P that is drawn out to the calling roller 18 or the like while effectively curling the curl of the document P on which the document pressing member 50 parallel to the paper feed table 11 is set. The side fence 19 can effectively restrict the rotation.
[0052]
That is, the stopper plate 52 and the lateral rib 50a together with the support plate 54 constitute member holding means.
[0053]
As described above, in the present embodiment, in addition to the operational effects of the above-described embodiment, the document pressing member 50 is formed separately from the stopper plate 52 that is directly fixed to the apparatus main body. After waiting at the top and the sheet feed table 11 is rotated by a predetermined angle, the distance t3 between the sheet feed table 11 and the upper surface of the document P can be made constant. Therefore, when waiting for the document pressing member 50 to be positioned at the uppermost portion of the depression 53, the document P can be easily set on the sheet feeding table 11, and the range of the rotation angle of the sheet feeding table 11 and the apparatus main body can be set. Regardless of the relative positional relationship with respect to, the separation distance of the document pressing member 50 from the upper surface (mounting surface) of the paper feed table 11 can be freely set.
[0054]
Further, the document pressing member 50 can maintain a posture facing the paper feed table 11 in parallel and can maintain a constant distance t3 from the upper surface of the document P in the vicinity of the document P, thereby curling the document P. Can be effectively suppressed in a large area.
[0055]
Next, FIG. 9 is a diagram showing a main part of a third embodiment of the document feeder according to the present invention mounted on a copying machine, and this embodiment corresponds to the fifth invention. In the present embodiment, a case where the present invention is applied to the above-described second embodiment will be described as an example, focusing on the characteristic portion.
[0056]
In FIG. 9, the document pressing member 50 is provided with a plurality of driven rollers (rotating members) 61 that face the roller surface from the opening on the side facing the sheet feeding table 11 so as to be rotatable in the sheet feeding direction of the document P. It has been.
[0057]
Therefore, when the document pressing member 50 presses the curl of the document P during feeding in a state where the distance t3 between the document pressing member 50 and the upper surface of the document P on the sheet feeding table 11 is adjusted to be constant while maintaining a parallel posture. The driven roller 61 is driven to rotate by being driven without applying a sliding contact force (load) to the document P to be fed.
[0058]
As described above, in this embodiment, in addition to the operational effects of the above-described embodiment, the curling of the document P can be effectively suppressed without applying a load to the fed document P. Accordingly, it is possible to eliminate the possibility that the document P is skewed by the load with which the document pressing member 50 slides.
[0059]
Next, FIGS. 10 and 11 are views showing the main part of the fourth embodiment of the document feeder according to the present invention mounted on a copying machine. This embodiment corresponds to the sixth to eighth inventions. To do. In the present embodiment, the same components as those in the above-described embodiment will be denoted by the same reference numerals, and description will be made focusing on the characteristic portions.
[0060]
In FIG. 10, the side fence 19 is provided with a rotation shaft 71 a in a base portion that intersects with the paper feed table 11, and rotates in a direction (width direction) orthogonal to the paper feed direction of the document P with the rotation shaft 71 a as a fulcrum. A movable arm 71 is housed, and a plurality of document pressing members 70 are juxtaposed in the arm 71 in a state adjacent to the stacking direction of the documents P set on the sheet feeding table 11.
[0061]
The arm 71 is provided with a lever 71b extending on the opposite side of the rotation shaft 71a, and the width direction of the document P is determined by the insertion / removal motion of the drive shaft 72a of the solenoid 72 connected to the other end of the lever 71b. The solenoid 72 is moved on the sheet feeding table 11 after the calling roller 18 is positioned at an appropriate sheet feeding position by the ascent of the sheet feeding table 11 and the filler 17 is detected by the sensor S3. The power supply is controlled so that it is kept on until the separation and feeding of the original P is completed, while it is turned off during standby or when a jam occurs in the fed original P.
[0062]
For this reason, the arm 71 is juxtaposed by rotating to the outer surface side with respect to the inner surface of the side fence 19 via the lever 71b when the solenoid 72 from which the drive shaft 72a protrudes by the elastic force of the built-in spring is OFF. All of the document pressing member 70 can be accommodated (withdrawn) inside the inner surface of the side fence 19, while when the solenoid 72 for attracting the drive shaft 72a is turned on, as shown in FIG. By being urged by the stopper (not shown) while being urged toward the inner surface side of the fence 19, the state parallel to the inner surface of the side fence 19 can be maintained, and the leading end portion of the document pressing member 70 can be maintained. Can be projected from an opening formed in the substantially same shape formed on the inner surface of the side fence 19. That is, the arm 71 constitutes a support member of the support means, while the solenoid 72 constitutes a curl presser setting means.
[0063]
On the other hand, the document pressing member 70 has a cross-sectional shape in the width direction of the document P having an inverted L shape, and a lower portion thereof is rotatably supported by a rotation shaft 70a. When the coil spring is biased in the counterclockwise direction and is rotated in the biasing direction of the coil spring, the extension portion from the rotation shaft 70a is stopped by the stopper at a position parallel to the arm 71. Yes.
[0064]
Therefore, when waiting or when a jam occurs in the fed document P, the solenoid 72 is turned off, and the arm 71 is rotated by the elastic force of the built-in spring of the solenoid 72 as shown in FIG. When the document pressing member 70 is retracted into the inner surface of the side fence 17 and the document P is set on the sheet feeding table 11 or when a jam occurs in the feeding document P, the document P on the sheet feeding table 11 is pulled out again. When setting, the document pressing member 70 does not get in the way.
[0065]
When the feeding of the original P set on the paper feed table 11 is started (including the restart after the jam is cleared), the calling roller 18 that presses the upper surface of the original P on the paper feed table 11 is lifted. When the filler 17 is positioned at a proper paper feed position detected by the sensor S3, the paper feed table 11 is stopped and the solenoid 72 is turned on, so that the arm 71 sucks the drive shaft 72a of the solenoid 72 as shown in FIG. The document pressing member 70 is moved so as to protrude from the inner surface of the side fence 19.
[0066]
At this time, the document pressing member 70 at a position less than the stacking thickness of the document P on the paper feed table 11 is pushed and rotated by the side of the document P against the elastic force of the torsion coil spring. The document pressing member 70 which is retracted into the inner surface of the fence 17 and located above the stacking thickness of the documents P on the sheet feeding table 11 is arranged such that the leading end from the inner surface of the side fence 19 is the document on the sheet feeding table 11. The curling of the original P that protrudes in a state of facing the P and is drawn out to the calling roller 18 or the like can be reliably suppressed, and the original P can be effectively restricted from rotating.
[0067]
That is, the torsion coil spring that biases the document pressing member 70 rotates the document pressing member 70 that is pressed by the side of the document P on the paper feed table 11 when the solenoid 72 is turned on and the arm 71 rotates. It is only necessary to set the elastic force to allow it to occur, and while maintaining the state of protruding from the inner surface of the side fence 19 to hold the curl of the original P, the side of the original P is not damaged. To. Note that the document pressing member 70 is biased in the direction protruding from the inner surface of the side fence 19 by the dead weight of the front end portion, so that the curl of the document P to be rotated can be pressed by this. The biasing means such as a torsion coil spring may be omitted. Further, the document pressing member 70 may be divided into two or more places separated in the feeding direction of the document P, and the inner surface of the side fence 19 may be secured between them.
[0068]
Thus, in the present embodiment, the document pressing member 70 that can be retracted / projected on the inner surface side of the side fence 19 depending on the presence or absence of the side of the document P is juxtaposed with the arm 71 adjacent to the stacking direction of the documents P. Thus, regardless of the number of documents P set, the curl of the document P can be reliably pressed by the document pressing member 70 facing the upper side without damaging the sides. Therefore, similarly to the above-described embodiment, the original P can be fed on the contact glass 101 of the original reading apparatus 100 with high quality without being skewed.
[0069]
Further, even when the document pressing member 70 is juxtaposed in the stacking direction of the documents P, when an operation for setting the documents P is necessary, the solenoid 72 is turned on / off in conjunction with a signal from the apparatus main body. It is automatically accommodated in the inner surface of the side fence 19 and does not deteriorate the setting property of the original P.
[0070]
【The invention's effect】
According to the present invention, the facing distance between the curl pressing member and the paper feed table (the interval between the curl pressing member and the document upper surface) is adjusted in accordance with the stop timing of the paper feed table that rises according to the number of documents. For example, the rotation of the document can be effectively restricted by restricting the curling of the document, and the document can be fed to the processing position of the main body without skewing regardless of the number of sheets set. Can be paper.
[0071]
By bringing the curl pressing members close to each other in a posture facing the paper feed table in parallel, the curl of the document can be effectively pressed down in a large area, and the paper feed quality can be further improved.
[0072]
By providing a rotating member on the curl pressing member, it is possible to reduce the load applied to the fed document, and it is possible to eliminate the risk of skew due to contact of the curl pressing member.
[0073]
Furthermore, the curl pressing member that retracts / protrudes into the side member depending on the presence / absence of the side of the document is juxtaposed with the stacking thickness of the document, so that the document can be held by the curl pressing member facing the upper side regardless of the number of sets. Thus, the curling of the original can be reliably suppressed and the rotation can be effectively restricted without damaging the sides of the original, and the original can be fed to the processing position of the apparatus main body without skewing.
[0074]
The curl holding member is automatically accommodated in the side member at the start of the work or when the original is set after the original jam is cleared, thereby preventing the skew of the original while securing the original setting property. .
[Brief description of the drawings]
FIG. 1 is a diagram showing a first embodiment of a document feeder according to the present invention, and is a front perspective view showing a schematic overall configuration thereof.
FIG. 2 is a perspective front view of a main part for explaining the configuration of document feeding.
FIG. 3 is a perspective front view of a main part for explaining the configuration of document feeding.
FIG. 4 is a perspective front view of a main part for explaining a configuration for suppressing curling of the document.
FIG. 5 is a perspective front view of a main part for explaining a configuration for suppressing curling of the document.
FIG. 6 is a diagram showing a second embodiment of the document feeder according to the present invention, and is a perspective view showing the main parts of the document feeder.
FIG. 7 is a perspective view showing components of the main part.
FIG. 8 is an elevation view of a main part for explaining a configuration for suppressing curling of the document.
FIG. 9 is a diagram showing a third embodiment of the document feeder according to the present invention, and is a perspective view showing the main components.
FIG. 10 is a perspective side view showing a main part of the document feeder according to the fourth embodiment of the present invention.
FIG. 11 is a perspective side view showing the original setting time.
FIG. 12 is a perspective view for explaining the prior art.
FIG. 13 is a perspective front view of the main part for explaining the configuration of document feeding.
FIG. 14 is a perspective front view of a main part for explaining a problem in the prior art.
[Explanation of symbols]
10 Document feeder
11 Feeding table
17 Filler (space adjustment means)
18 Calling roller
19 Side fence (side member)
40, 50, 70 Document holding member (curl holding member)
41 Stay member
42 Support plate
52 Stop plate (member holding means)
55 Guide rail
59 Compression spring
61 Followed roller (rotating member)
71 Arm (support member)
72 Solenoid (curl presser setting means)
100 Document reader
101 Contact glass
S3 sensor (interval adjustment means)

Claims (8)

A paper feed table on which the original is placed, a side member that contacts the side of the original on the paper feed table to limit the rotation of the original, and the original on the paper feed table facing the paper feed table is constant. A document feeding device that includes a curl pressing member that restricts curling as described above, and separates and feeds the documents on the sheet feeding table one by one to the processing position of the apparatus body,
A distance adjusting means for changing the distance between the curl pressing member and the sheet feeding table to bring the upper surface of the original on the sheet feeding table close to the curl pressing member and making the distance therebetween constant is provided. Original document feeder. The curl pressing member is fixed to the apparatus main body side, and is disposed so as to be in contact with and away from the sheet feeding table that moves in the vertical direction by the driving means.
The interval adjusting unit detects that the interval between the upper surface of the document on the sheet feeding table adjacent to the curl pressing member and the curl pressing member is constant, and stops the driving unit. The document feeder according to claim 1. A member holding means for holding the curl pressing member so as to be able to come into contact with and separate from a paper feed table that moves up and down by a drive means, and to come close to a paper feed table that moves when a paper feed operation starts. Provided,
The interval adjusting unit detects that the interval between the upper surface of the document on the sheet feeding table adjacent to the curl pressing member and the curl pressing member is constant, and stops the driving unit. The document feeder according to claim 1. 4. The document feeding device according to claim 3, wherein the member holding means holds the curl pressing member so as to be able to contact and separate from the paper feeding table while maintaining a posture facing the paper feeding table in parallel. apparatus. 5. The document feeding device according to claim 1, wherein the curl pressing member is provided with a rotating member that rotates in a direction in which the document is transported when contacting the document on the sheet feeding table. apparatus. A paper feed table on which the original is placed, a side member that contacts the side of the original on the paper feed table to limit the rotation of the original, and the original on the paper feed table facing the paper feed table is constant. A document feeding device that includes a curl pressing member that restricts curling as described above, and separates and feeds the documents on the sheet feeding table one by one to the processing position of the apparatus body,
Providing a support means for supporting the curl pressing member so as to be juxtaposed adjacent to each other in the document stacking direction;
The supporting means supports the curl pressing member so that it can be retracted into the side member by being pushed by the side of the document positioned on the side, and protrudes from the side surface of the side member when there is no document on the side. An original feeding apparatus characterized by supporting an original on a paper feeding table so as to face and curl the original. As the support means, a plurality of curl pressing members are juxtaposed and accommodated in the side member together with the curl pressing member, and the support member is moved to project the plurality of curl pressing members integrally from the side member, or A curl presser setting means to be accommodated in the side member,
7. The document feed according to claim 6, wherein when the document is set on the sheet feed table, the curl press setting means moves the support member so that the curl press member is accommodated in the side member. apparatus. 8. The document according to claim 7, wherein the curl presser setting means moves the support member so that the curl presser member is accommodated in the side member when a jam occurs in the separately fed document. Paper feeder.

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