JPS6160536A - Sheet feeder - Google Patents

Abstract

PURPOSE:To stably feed a sheet by setting the travel of a sheet feed roller to a position corresponding to the width of a document through a control circuit according to a signal detecting the width of a document to be fed and moving the sheet feed roller according to a signal of the travel. CONSTITUTION:Documents 1a, 1b of the minimum width and the maximum width are placed on a sheet feed table 2, with the respective one ends thereof brought into a reference surface. In this case, there are provided a plurality of detectors 17 on the opposite side end of the surfaces 3 of the placed documents 1a, 1b. Accordingly, the number of the detectors 17 for detecting the existence of a document is determined by the width of the document, and according to the number of detection signals, a motor 15 is rotated normally and reversely through a control circuit. A holder 9 is moved to the left or to the right on a shaft 10 by the distance corresponding to the number of detection signals through a reversing roller 14 and a wire 16. Thus, a sheet feed roller 12 can be automatically located at a proper position corresponding to the width of a document 1 to stably feed the document.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] Optical character reading device (hereinafter referred to as OCR device) of the present invention
The present invention relates to a sheet feeding device for forms used in the like, and particularly to a sheet feeding device that can automatically set the position of a sheet feeding roller according to the width of a sheet.

[Technical Background of the Invention] Conventionally, document feed devices used in OCR devices, etc.
The paper feed roller that comes into contact with the forms on the paper feed tray and is rotated by a drive source to feed the forms from the paper feed table is fixed at a fixed position, and the In some cases, the paper feed roller is manually moved to set an appropriate feed roller position.

[Background Art Problem J] In the conventional paper feeding device described above, when the paper feeding roller is fixed, the document width that can stably feed paper is limited, and the ratio between the minimum width and the maximum width is limited. If the value exceeds the limit, stable paper feeding becomes difficult, and when setting the paper feed roller position manually, incorrect settings are likely to occur due to operator error, and manual operations are often cumbersome, resulting in stable paper feeding. The drawback was that it was not possible to expect a high paper feed rate.

[Object of the Invention] The present invention has been made in view of the above-mentioned points, and provides a paper feeding device that can automatically set the paper feed roller position according to the width of the document to be fed, and that can reliably and stably feed paper. The purpose is to provide.

[Summary of the Invention] The paper feeding device of the present invention uses a form width detection means for detecting the width of a fed form and a detection signal of the form width detected by the form width detection means to move the paper to a position according to the form width. a control circuit that determines the amount of movement of the 1iff paper feed roller;
A mechanism is provided in this 11 circuit for moving the paper feed roller in response to a signal indicating a predetermined amount of movement.

According to the above-described configuration, there is no need to manually set the position of the paper feed roller, and the paper feed roller automatically moves to an appropriate position according to the document width, so that stable paper feeding is possible.

[Embodiment of the Invention] An embodiment of a paper feeding device according to the present invention will be described below with reference to the drawings.

1 and 2 are a plan view and a side view, respectively, showing an embodiment of the present invention. In the same figure, the paper feed tray 1 is the paper feed tray 2.
The sheet is placed on top with one side of the sheet in contact with a reference surface 3 provided on one side of the paper feed tray 2.

This reference surface 3 is provided upwardly and perpendicularly to the paper feed tray 2. A shaft 4 rotated by a drive source (not shown) is rotatably supported on the reference surface 3 at right angles to the reference surface 3 and parallel to the paper feed tray 2 . A holder 5 is fixed concentrically with the shaft 4 and in the vicinity of the reference surface 3, and a fixed roller 6 is rotatably supported near one end of the holder 5 on the side opposite to the shaft 4. ing. A roller 7 is fixedly provided on the shaft 4 at a position opposing the roller 6. The rotation of the shaft 4 is transmitted to the roller 6 by the rotation of a feed belt 8 that connects these rollers 6 and 7. Further, another holder 9 is provided on the shaft 4 so as to be movable on the shaft 4 in the slat direction.
One end is slidably supported on a slide shaft 10 which is fixed at right angles to the reference plane 3 and parallel to the shaft 4 . A movable roller 11 is rotatably supported on this holder 9 concentrically with the shaft 4. The movable roller 11 is movable in the thrust direction on the shaft 4 via the shaft 4 and a key and keyway (not shown), and rotates together with the shaft 4. A movable roller 12 is rotatably supported at one end of the holder 9 on the opposite side from the slide shaft 10 at a position facing the movable roller 11. It is transmitted by the rotation of the connected feed belt 13.

- A reversing roller 14 is rotatably supported at one end of the holder 9 on the slide shaft 10 side, and is fixed to the holder 9.
J driven by the motor 15 which is
There is. Inversion lawn 14 has 14 surfaces 3 and paper feed stand 2 to the base.
A wire 16 whose both ends are fixed is wound around a frame (not shown) standing upright from the other end, and the rotation of the motor 15 causes a reversing roller 1 supported by 1 kl on this rotating shaft.
4 rotates. The holder 9 is moved on the slide shaft 10 and the shaft 4 due to the friction force between the wire A716 and the reversing roller 14 due to the rotation of the opposite roller 14. In this embodiment, the holder 9, slide shaft 10, moving rollers 11, 12, feed belt 13, reversing roller 14, motor 15 and wire 16 constitute a moving mechanism 20. Numeral 17 is a detector for detecting one side of the form 1 placed on the paper feed table 2 on the side opposite to the reference surface 3. A plurality of detectors 17 are arranged at equal intervals on the lower surface of the paper feed table 2 parallel to the shaft 4. The number indicating whether the right end position of the form 1 placed on the paper feed tray 2 covers the detector 17 is output as an ON/OFF signal.

The operation of this embodiment configured as described above will be explained below. X7) l-/I is connected to a power source (not shown).
'/A L, fixed [+-/6.7 and moving [1-11
The feed bells 8 and 13 are rotated through the respective feeders 8 and 12 to feed the form 1 on the paper feed table 2. If the minimum width form 1 is the maximum width form 1b, these forms 1 are set as reference plane 3.
Form 1 is stacked on paper feed tray 2 with one end in contact with
a and 1bl/) Since a plurality of detectors 1.7 are provided at the end opposite to the reference surface 3, the number of detectors that detect the presence of a form is determined by the length of the form width, and this detection signal The motor 15 is connected to the motor 15 via a control circuit (not shown) depending on the number of
make a forward and reverse rotational motion. As the motor 15 rotates, the holder 9 is moved to the left or right by a distance corresponding to the detected signal 8° on the slide shaft 10 via the reversing roller 74 and the wire V716. . In this way, the paper feed roller 12 can be automatically placed at an appropriate position according to the width of the form 1, so that stable paper feeding is possible. FIG. 3 shows the above operation flow as a block diagram.

In this embodiment, a case has been described in which the detection of a form is performed by turning on and off a detector that detects the presence of a plurality of forms, but other known detection means may be used. In addition, although the case where the moving roller 12 for paper feeding is driven by the motor 15 via the reversing roller 14 and the wire 16 has been described, it is also possible to move the moving roller 12 for paper feeding by driving the motor 15 via the reversing roller 14 and the wire 16. The moving roller 12 may also be moved.

[Effects of the Invention] As described above, according to the present invention, the width of the document to be fed is detected and the paper feed roller is automatically moved to a position according to the document width via the control circuit. Therefore, the operator's operation is no longer required to set the position of the paper feed roller, and the position of the paper feed roller can be set reliably, allowing stable paper feeding.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of a paper feeder according to the present invention, FIG. 2 is a side view of FIG. 1, and FIG. 3 is a flowchart showing the operation of this embodiment. 1... Form 2- Paper feed tray 3... Reference surface 4.
...Shaft 5, 9...Holder 6.7...-Fixed roller 11, 12...Moving roller 8.13--
Feed belt 10--Slide shaft 14-Reversing roller 15
・-・Motor 16・-Wire 17-・Detector agent Patent attorney Noriyuki Chika (and 1 other person) Fig. 1 Fig. 3

Claims (1)

[Claims] In a paper feeding device that feeds documents stacked on a paper feed tray by a paper feed roller driven by a drive source, the document width detection means detects the width of the documents, and the document width detection means A paper feeding device comprising: a moving means for moving the paper feeding roller to a position corresponding to the document width based on a detection signal detected by the document width.