JPH0549579B2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to a device for conveying sheet materials such as copy paper, transfer paper, and read manuscripts, and in particular to a copying machine,
The present invention relates to a device for gripping and conveying sheet materials, which is used to reliably convey sheet materials one by one in electronic files, facsimiles, printing machines, and the like.

<Prior art> Conventionally, as a device for conveying sheet materials such as sheets of paper or manuscripts one by one to a predetermined position, the sheet materials to be conveyed are picked up by a paper feed roller or the like and sandwiched between a pair of rollers. One that transports one sheet at a time is common and widely used.

A device using this pair of rollers uses friction between the rollers to carry out conveyance. Therefore, it may easily damage the sheet material (original) or stain the surface of the sheet material.
It has many drawbacks, such as slippage on art paper or coated paper with a low surface friction coefficient, and meandering caused by unbalanced roller shapes during the conveyance process.

In order to overcome these drawbacks, various devices have been proposed that use air suction to adsorb sheet materials and convey the adsorbed sheet materials.

This device that uses air suction connects a sheet material suction section with an air suction port on the bottom and a suction air casing with a negative pressure chamber inside, and sucks one side of the sheet material on the bottom surface of the sheet material suction section. The sheet material is conveyed while being in contact with one side of the attracted sheet material by rotation of a friction member such as a belt or a roller provided on the bottom surface.

However, the above-mentioned sheet material conveying device is difficult to transport due to the above-mentioned reasons, especially when handling thin sheet materials, for example, because it is troublesome to adjust the suction force, and when thin and thick sheet materials are mixed. Not only is this difficult, but even compared to the case where a pair of rollers is used, there is a greater risk of meandering occurring because the sheet material is not held down from both sides like a pair of rollers.

On the other hand, sheet material conveyance devices in which driving members such as chains are directly connected near both sides of the document gripping portion have been provided, but due to restrictions from the driving devices such as chains, it has not been possible to provide a small, high-precision device. Have difficulty.

<Object of the Invention> In view of the above-mentioned drawbacks, it is an object of the present invention to provide a small and highly reliable document conveying device that does not stain or damage sheet materials and does not cause conveyance errors. .

<Embodiment> The document conveying device of the present invention will be described in detail below with reference to the drawings showing an embodiment of the present invention.

FIG. 1 is a schematic perspective view of a document conveying device according to the present invention, and FIG. 2 is an explanatory diagram for explaining the operation of the present invention. FIG. 3 is an explanatory diagram for explaining the reversal motion. Identical parts are given the same reference numerals.

Reference numeral 12 in the figure indicates a base plate of the document conveying device, and two frames 13 are provided on the base plate 12 to support the grip plate rotating shaft 14 via a bearing member 25. A driving worm wheel 19 is attached to the grip plate rotation shaft 14, and the worm wheel 19 is attached to the output shaft of a grip plate rotation motor 15 attached to the lower part of the base plate 12. The worm 18 that is shown is engaged. On the other hand, the grip plate rotation shaft 14 is provided with an arm 11 for fixing the main support 3 for supporting the grip plates 1 and 2, and the arm 11 is positioned at the grip plate rotation shaft 14. The timing slit 16 is determined based on a signal from a sensor (not shown) mounted on the opposite side, and its rotation is locked by a worm 18 and a worm wheel 19. In other words, the grip plate rotation motor 15 rotates and stops the grip in the direction of arrow A in the figure.
The timing slit 16 is controlled and driven based on a signal from a sensor. The main column 3 attached to the arm 11 is provided with document gripping plates 1 and 2 via gripping plate mounting blocks 5 and 6, respectively. The document gripping plates 1 and 2 are drawn together with a constant force by a plurality of spring members, and are brought into contact with each other by an elastic friction member 9 provided at the tip (sheet material gripping portion) of each gripping plate. There is. And the aforementioned document gripping plate 1
The rotation in the direction of arrow B in the figure with the main support 3 of 2 as a fulcrum is achieved by the operation of a solenoid (not shown) attached to a solenoid mounting plate (not shown) fixed to the arm 11. However, the rotation angle is constant. Further, reference numerals 7 and 8 in the figure are sensors for detecting the edge of the document to be gripped. Further, a paper ejection claw 31 is provided on a paper ejection support post 30 mounted on the frame 13 via a paper ejection claw mounting block 35. The aforementioned rotation of the paper ejection claw 31 in the direction of the arrow C in the figure about the paper ejection post 30 as a fulcrum is achieved by the operation of a solenoid (not shown). The entire device configured as described above has a slider 2 provided at the bottom of the base plate 12.
Further, on the opposite side, two sets of rollers 21 attached to legs 22 move on the rail 24 via a driving motor (not shown) on the slide shaft 17 via a bearing material 28 provided inside the slide shaft 17. The drive transmission wire 23 is configured to run in the E direction in the figure. Also, code 7 in the figure
Reference numeral 6 denotes a support of the reversing assist bar 81, and as shown in the figure, the document gripping portion protrudes from the opposite side. The reversal assisting bar 81 is connected to the reversing assisting bar support column 76.
It is rotatably provided around the shaft via a bearing material (not shown).

Next, the operation of the document conveying apparatus according to the present invention constructed as described above will be explained with reference to FIG.

FIG. 2 shows the process of a double-sided document reading device as an embodiment using the document conveying device according to the present invention. In FIG. 2, reference numeral 50 indicates the upper surface of the platen glass, and reference numeral 55 indicates the document P by air suction, for example.
A document suction device that pulls up the document to a predetermined paper feeding position is shown in each case. Further, reference numeral 60 indicates a document storage tray, P and P' indicate sheet-shaped documents to be conveyed, and P'' indicates a document accommodated in the document storage tray 60.

First, when an instruction is given to start reading a document, the document suction device 55 pulls up the document P to a predetermined paper feeding position shown in FIG. 2a. At this time, the document conveyance device is in the standby position and is not in operation. Next, the document P to be transported by the document suction device 55
After confirming that the
As shown in the figure, the gripping plates 1 and 2 are
is opened, and the entire document feeder moves forward (as shown by arrow E in the figure).
movement in the direction). This forward movement stops when the edge of the document P is detected by the document edge detection sensors 7 and 8, the solenoid is released, and the document gripping plates 1 and 2 are closed by the action of the spring member as shown in FIG. In this state, the end of the document P is held between the document gripping members 9. The original P held between the original holding plates 1 and 2 in the manner described above is conveyed in the direction shown by the arrow E in the figure d, and then stopped at the position shown in the figure e, that is, the original reading position. . This operation is performed by a position detection means (not shown). Then, in order to make it easier for the reading surface of the original to come into contact with the upper surface of the platen glass 50, the original holding plates 1 and 2 are rotated by a certain angle while keeping the original P narrowed, that is, at the tip 88 of the original gripping part.
After the document comes into almost contact with the upper surface 50 of the platen glass, the original reading operation is performed. As described above, the original P whose one side has been read is rotated by the arm 11 as shown in FIG.

This reversing operation is performed when the document P held by the document gripping section
is a support 7 protruding from the side opposite to the document gripping portion.
This is done by rotating around an auxiliary reversal bar 81 rotatably provided around the reversing member 6 via a bearing material (not shown) (see FIG. 1). This reversing auxiliary bar 81 is particularly effective when, for example, as shown in FIG. 3a, the original cannot be turned over only by the rotating operation of the original gripping section, that is, the original is weak. Of course, as shown in FIG. 3b, this method is effective even when the original is stiff. Then, as the original P is conveyed in the direction of the arrow E as shown in FIG. 2g, the original P can be completely turned over without being damaged or soiled. The inverted original P is conveyed to the original back side reading position shown at h in the figure. Here, as described above, the document reading operation is performed while the tip 88 of the document gripping section is in substantially contact with the upper surface 50 of the platen glass. The arm 11 then rotates in the direction of arrow A, and enters the state shown in FIG. During this process, the gripping plates 1 and 2 are opened by the solenoid and the document P is dropped onto the upper surface 50 of the platen glass.

Next, the document conveyance device returns to the standby position, and in the same manner as described above, the end of the document P' is sandwiched between the elastic friction members 9, and the document P' is conveyed in the direction shown by arrow E in FIG. be done. At this time, the paper discharge claw 31 is rotated in the direction indicated by arrow C in FIG. Therefore, when the original P' is conveyed to the original reading position, the original P is stored in the tray 60 by the ejection claw 31 (k,
l). At this point, a solenoid (not shown) is released and the paper discharge claw 3 is pulled up by a spring (not shown). Thereafter, the double-sided document is read in the same manner as described above, and the next conveyance operation begins.
Although a paper ejecting claw is used here as an example of the document removal section, it is of course possible to use a removal section that sucks and removes the document.

Furthermore, it goes without saying that only one side can be read by opening the grip plates 1 and 2 after reading one side, dropping the document onto the platen glass upper surface 50, and starting the next conveyance operation.

<Effects> As described above, according to the document conveying device according to the present invention, by gripping and conveying the sheet material, unlike a conventional device that conveys the sheet material using a friction member, it is possible to avoid staining or damaging the sheet material. It is possible to reliably convey the sheet material without causing any errors or errors in conveyance. That is, according to the document conveying device of the present invention, one moving section is provided with the gripping means, the paper ejecting means, and the reversing means, so that the sheet conveying operation and the sheet ejecting operation are performed simultaneously, and the conveying operation is performed after the reversing operation. As a result, the apparatus can be simplified and miniaturized, and since the conveyance operation and paper ejection operation are performed simultaneously, the total conveyance time can be shortened.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view of the document conveying device according to the present invention, FIGS. 2 a to 1 are explanatory views for explaining the operation of the present invention, and FIGS. 3 a and 3 are supplementary explanatory views of the reversing operation. 1, 2...Document grip plate, 3...Main pillar,
7, 8... Original edge detection sensor, 9... Elastic friction member, 11... Arm, 12... Base plate, 14
...Gripping plate rotation axis, 15...Gripping plate rotation motor, 16...Timing slit, 18...Worm, 19...Worm foil, 24...Rail, 30... Paper ejection support, 31... ...Paper ejection claw, 5
0...Top surface of platen glass, 55...Document suction device, 60...Discharged document storage tray, 76...Support for reversing auxiliary bar, 81...Reversing auxiliary bar, S...
Spring material, P, P', P''...Manuscript (sheet material).

Claims (1)

[Scope of Claims] 1. A document gripping section that grips the leading edge of the document, a rotating section that rotates the document gripping section about a predetermined fulcrum, a document removal section that removes the document, and the document gripping section. a moving part that supports the rotating part and the document removal part and moves back and forth through a predetermined position; and a moving part that supports the rotating part and the document removing part, and assists in reversing the document by the operation of the rotating part when the document gripping part grips the leading edge of the document. a reversing auxiliary section, and when the moving section moves in the first direction while the document gripping section is gripping the leading edge of the document, the document removal section removes the document present in the movement path; When the moving section moves in the second direction after the rotating section is in a state where the leading edge of the document is gripped by the document gripping section, the reversing auxiliary section is configured to assist in reversing the document following the movement. A document conveyance device characterized by: