JPS61106339A - Paper supply mechanism - Google Patents

Abstract

PURPOSE:To enable a sheet of paper to be securely fed in the next transfer by detecting the feed of a plurality of sheets of slips to return them to a paper supply bed and adjust properly pressure against the slip so as to feed them one by one. CONSTITUTION:When a plurality of slips are supplied to a transfer path, a plural slip feed detector 28 sends the detecting signal A for indicating errors to a control section 29. Upon receiving this signal A, the control section 29 sends the signal F to a motor controlling section 11 to stop the rotation of a feed roller 5 and a pick roller 8. Upon receiving the signal F, the motor controlling section 11 stops a motor 10 to stop the feed roller 5 and pick roller 8. Thereafter, the control section 29 sends the pressure adjusting signal E for indicating the obviation of pressure of the feed roller 5 and pick roller 17 applied to the slips and similarly the reverse roller pressure adjusting signal C at zero level to actuators 16, 24 so as to return a plurality of slips.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a paper feeding mechanism for forms.

[Technical background of the invention and its problems]

In a form transport mechanism such as an OCR or a copying machine, one of the important functions is to prevent multiple sheets of forms from being fed. FIG. 4 shows a conventional paper feeding mechanism. 1 is a form, 2 is a feed roller that sends out form 1, 3 is a pick roller that sends the form sent from feed roller 2 to the conveyance system, 4 is a reverse roller that prevents feeding of multiple forms, 5 is a reverse roller The arm 6 supporting the is attached to the T-arm 5 at one end with a tin ring, and the other end is fixed. 7 is a multiple sheet feed detection mechanism provided on the conveyance path. Next, this operation will be explained. Feed roller 2 is placed in moderate pressure contact with form 1.
is rotated in the direction of arrow a.

Then, the feed roller 2 feeds one sheet of paper to the pinoclaw 23 which is being rotated in the direction of the arrow. Pick roller 3
sends that one @me to the following transport system. On the other hand, a reverse roller 4 faces the pick roller 3 and is rotated in the direction of arrow C while being pressed by an arm 5 and a spring 6 to prevent multiple sheets from being fed. 10,000 - If multiple sheet feeding cannot be prevented, the multiple sheet feeding detection mechanism 7 etc. that detects the amount of transmitted light is used to detect 1! Detects the feeding of several sheets, stops the paper feeding operation, and issues a warning such as a buzzer to prompt the operator to remove multiple sheets. Therefore, with the conventional paper feeding mechanism, it is possible to prevent multiple sheets from being sent to the conveyance system, but unless the multiple sheet feeding detection device 7 requests operator intervention every time the multiple sheet feeding is detected, the sheets will not be fed. The disadvantage was that the paper operation could not be restored. Recently, as shown in FIG. 5, a device for restoring the multi-sheet feeding state without operator intervention has been devised. To explain the configuration of this device,
A feed roller 1 sends the form to a separation mechanism composed of a separation row 22 and a separation belt 3. Reference numeral 4 designates a form detection mechanism provided at a predetermined position on the conveyance path, 5 a paper feed tray, and 6 a motor that moves the paper feed tray 5 up and down. According to this, when a plurality of sheets of forms are constituted by a feed roller, the plurality of sheets of books M are stopped by a portion Maw constituted by a separation roller 2 and a separation belt 3. Then, the form detection section 4 detects that the form does not pass. From now on, the paper feed table 5 is lowered once by the septa 6, and the plurality of forms stuck in the separation mechanism are separated by their own weight. Thereafter, the paper feed tray 5 is raised by the motor 6 to resume paper feeding.

Although this conventional device can automatically restore the state of feeding multiple sheets, it takes time to recover, and there are also problems in that the documents cannot be separated accurately because the separation is performed only by the weight of the documents themselves.

[Purpose of the invention]

Even if multiple sheets are fed, the present invention automatically restores the multiple sheet feeding state without involving a person, and automatically controls the i! An object of the present invention is to provide a paper feeding mechanism that performs 14-fold alignment.

[Summary of the invention]

The paper feeding mechanism of the present invention has a paper feeding table for stacking forms, a conveying means for delivering one form loaded on the paper feeding table, and a conveying means for feeding a plurality of forms by this conveying means. The paper feeder If! of the present invention has a multi-sheet feeding υ detection means on the conveyance path in order to detect that the feeding of multiple sheets of forms is detected by this detection means. At this time, the multi-sheet feeding state is restored by means for driving the conveyance means to return the plurality of documents on the conveyance path onto the paper feed tray, and the plurality of sheets of documents are returned to the paper feed tray by the conveyance means. A pressure adjusting means is provided for iMfK adjusting the pressure exerted on the form by the conveyance means so that the form is conveyed one by one after the conveyance means is returned to the sheet, thereby ensuring that one sheet is fed in the next conveyance.

[Embodiments of the invention]

An embodiment in which the present invention is applied to a paper feeding mechanism of an optical character reader (OCR) will be described below with reference to FIGS. 1, 2, and 3. Reference numeral 1 denotes a paper feed tray, and forms 2 are stacked on the paper feed tray 1. An actuator 3 is attached to the bottom of this paper feed tray 1, and a form guide 4 is attached to the top of the paper feed tray 1. A feed roller 5 is provided above the book JPI2. As shown in FIG. 2, the quick draw 25 is in contact with a bearing 6, and the bearing 6 is in contact with the shaft 7 of the feed roller 5. A pick roller 8 is provided in the paper feeding direction of the feed roller 5. This pick roller 8 is attached to a shaft 9, and the shaft 9 is attached to a motor 10. The pick roller 8 is rotated by the motor 100 revolutions. A motor control unit 11 is connected to the motor 10 to control the direction in which the motor rotates. Also, this pick roller 8
A groove is provided in the foot roller 5 so that a belt can be hung thereon, and a bell 12 is hung thereon. This belt 1
2, the rotation of the pick roller 8 is transmitted to the feed roller 5. An arm 13 is provided on the shaft 9 of the pinocrawler 8 via a bearing 6. This arm 13 is attached to the shaft 7 of the feed roller 5. axis 7 and axis 9
There is a ring 14 on the outside of the bearing 6 to prevent it from coming off.
is the installation. Further, a spring 15 is attached to the other end of the arm 13, and an actuator 16 is attached to this spring 15. The rotation of the motor 10 is transmitted to the shaft 9 and rotates the pick roller 8, but the rotation is not transmitted to the arm 13 due to the action of the bearing 13. The 280 rotations of the pickrow are transmitted to the feed roller 5 by the belt 12, and the feed roller 5 rotates.
Due to the action of the bearing 6, the rotation of the feed roller 50 is not transmitted to the shaft 7. By operating the actuator 16, the feed roller 5 can move up and down using the shaft 9 of the pinocrawler 8 as a fulcrum. A reverse roller 17 is provided below the pick roller 8, facing the pick roller 8, and contacting the form with appropriate pressure to prevent the feeding of multiple forms. A one-way clutch 19 is attached to the shaft 18 of the reverse roller 17, so that the reverse roller 17 rotates only in one direction. Further, a belt 20 is wrapped around the reverse roller 17, and this belt 20 is driven by a motor (not shown).
X
It is turning in the direction (b). And the arm 22 is attached to the shaft 18.
is attached, and a spring 23 is attached to the other end of this arm 22.

An actuator 24 is attached to the other end of the spring 23, and the operation of the actuator 24 causes the reverse roller 17 to move around the shaft 25 of the roller 21 as a fulcrum.
can be moved up and down. Furthermore, a light emitting diode 26 and a phototransistor 27 are provided at predetermined positions on the conveyance path, and these are connected to a multiple sheet feed detection device 28.

This is a device that shines light onto paper and determines the number of sheets of paper based on the amount of light transmitted. This multiple sheet feed detection device 28 sends a detection signal A to the control section 29. In addition to the detection signal A, this control section 29 receives a feed signal Bt- from the main body side which instructs to start feeding. This feed signal B is sent out from the main body every time scanning of the form is completed. Also, the control section 29
A bar roller pressure adjustment signal C is sent to the actuator 24 to adjust the pressure between the reverse roller 17 and the form, and a paper feed tray adjustment signal D is sent to the actuator 3 to adjust the roughness of the paper feed tray.
t-, a feed lower roller pressure adjustment coefficient E that adjusts the contact pressure between the feed roller 5 and the form is applied to the actuator 16, and a rotation direction control coefficient E is applied to the Tanabata control section that controls the rotation direction of the feed row 25 and Hinotaro-28. Issue number F.

Next, the operation of this paper feeding device will be explained. As shown in FIG. 3, when the feed signal B instructing to start feeding the form is issued from the main body side to the control unit 29, the control unit 29 outputs a normal level feed signal that instructs the pressure in the normal form conveyance state. Roller pressure FAk61#44EN Normal
A level reverse roller pressure adjustment signal C is sent to the actuator 16.24. As a result, the feed row 2 is set to apply pressure to the form to carry out normal form conveyance, and the reverse roller is set to perform normal multi-sheet feeding prevention. Then, the control section 29 sends a rotation direction control signal F instructing the feed to the motor control section 11 to start conveyance. Upon receiving this signal F, the motor 10 begins to rotate in the transport direction, and the pick roller 8 and feed roller 5 rotate in the y direction.

Through these operations, even if one or more forms would normally be fed, the reverse roller 17 prevents the feeding of more than one form, and only one form is sent to the conveyance path. However, depending on the pressure exerted on the forms in each row 2 or the state of the forms, a plurality of forms may be sent to the conveyance path. Then, the multiple sheet feed detection device 28 detects that the amount of light transmitted is less than the amount of light transmitted through one sheet, and an E is sent to indicate an error.
The detection signal A at the rror level is sent to the control section 29. Upon receiving this signal A, the control section 29 instructs the feed roller 5 and the big row 280 to stop rotating.
A rotation direction control signal F of p level is sent to the motor control section 11. The motor control unit 11 receives the signal Ft- and stops the motor 10.

As a result, the feed roller 5 and pick roller 8 stop.

After that, in order to return the plurality of forms, the control unit 29 causes the actuator 16.24 to move the feed roller 5 over the forms.
A zero level feed roller pressure adjustment signal E1 instructing to eliminate the pressure of the pick roller 17 and a reverse roller pressure adjustment signal C also at zero level are sent. Further, in order to make it easier to return multiple sheets of documents onto the paper feed tray 1, the control section 29 sends a low level paper feed tray adjustment signal Dt instructing the seventh cutter 3 to lower the MJLt table 1t. As a result, the feed roller 5 and the form 2 on the paper feed table 1
As the number of courses spread, it will become easier to return several Fji forms.

Then, the control f529 sends a rotation direction instruction signal F at Reverse level that instructs the motor control section 11 to rotate the motor 10 in the reverse direction in order to return the plurality of chestnuts. This causes the motor 10 to start rotating in reverse, the feed roller 5 and the pick roller 8 to rotate in two directions, and the plurality of forms on the conveyance path to be returned. Here, the reverse row 217 is rotating in the X direction, but due to the action of the one-way clutch 19, even if it is rotating in the X direction slower than the speed of the pick roller 8, which rotates in two directions, it is possible to It cannot prevent the paper from returning, and it rotates to match the speed at which multiple sheets of paper are returned. When the multiple-sheet document returns, the multiple-sheet feed detection device 28 detects that the multiple-sheet document has returned, and sends a zero-level detection signal A to the control unit 29 indicating that there is no document. Upon receiving this detection signal A, the control section 29 controls the feed roller 5 after a certain period of time.
, sends a rotation direction control signal F of level 5 top to instruct the motor control unit 11 to stop the rotation of the pick row 28.

Here, how far to return the multiple sheets is determined by Pickrow 2.
It can be arbitrarily determined depending on the speed of 80 rotations and the timing from when the multi-sheet feed detection device 29 stops detecting a multi-sheet document until the pick row 28 is stopped. When the multiple sheets return to the desired location, the control unit 29
In order to stop the rotation of the feed row "y5", the rotation direction control signal F of the 5 top level is sent to the motor control section 11 to instruct the motor control section 11 to stop the rotation.When the rotation stops, the control section 29 changes the feed row to multiple sheet feeding. The reverse roller 8 is configured to increase the pressure of the feed roller 5 on the form from the normal state.
A high level feed roller pressure adjustment signal E1 instructs to increase the pressure applied to the form from the normal state to prevent multiple sheet feeding.

Same (H1gh level reverse roller pressure adjustment signal C
is sent to the actuators 16 and 24. As a result, the pressure of the shift roller 5 and the pressure of the reverse roller 17 are increased from the normal state so that one sheet can be fed more reliably. In addition, the control unit 29 instructs the paper feed tray l to be set to a high level of crystallization higher than the normal state so that it is easier to feed one sheet.
Paper feed tray adjustment signal Dt at h level is sent to the actuator 3. After that, the control unit 29 controls the motor control unit 11 to rotate the feed row 25 and the pick roller 8 in the X direction.
d level rotation direction control signal F is sent. When one sheet is fed in this manner, the multiple sheet feeding detection device 28 outputs a detection signal A of OK level, and it is detected that one sheet has been fed. When one sheet feed is detected, the control unit 29 returns the feed roller pressure adjustment signal E1 and the reverse roller pressure adjustment signal CtNormal level Pc to return the pressure of the feed roller 5 and the pressure of the reverse roller 8 to the pressure in the normal state, and the actuator Send on 16.24. Further, the control unit 29 sets the paper feed tray adjustment signal p tNoma 1 level and sends it to the actuator 3 so that the height of the paper feed tray 1 is returned to the height in the normal conveyance state. As a result, the pressure of the feed roller 5, the pressure of the reverse roller 8, and the height of the paper feed table 1 return to the pressure and height in the normal conveyance state. The next conveyance is performed at the same pressure and height as in the normal conveyance state. If multiple sheet feeding cannot be corrected in the first recovery operation, the level of each pressure adjustment signal is raised stepwise and the same operation is repeated a predetermined number of times until one sheet feed IC is reached.

〔Effect of the invention〕

According to the present invention, even if a plurality of sheets of the form is fed, it is possible to return the plurality of sheets automatically and without jamming, and after that, the contact pressure between the conveying means and the sheet can be adjusted. By changing the paper feeding conditions such as the height of the paper, the settings are made to ensure that one sheet can be fed, and then the paper feeding operation is performed again.
Compared to conventional paper feeding devices, the probability that an operator will have to perform recovery work for feeding multiple sheets of forms is further reduced, and processing can be performed more quickly.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of the paper feeding mechanism of the embodiment viewed from the side, #! 2
The figure is a configuration diagram of the feed row 2 and pick roller seen from above. Figure 3 is a timing chart of paper feeding operation.
FIG. 5 is a diagram showing a conventional paper feed fitting groove. l Paper feed stand, 2-11! ! ! Votes, 4 [Votes Kite, 3
゜16.24 Actuator, 5 Feed roller, 8・Bin roller, 11 Motor control section, 17・Reverse roller, 14.21 Arm, 26 Multiple sheet feed detection device, 27 Control 1111f15゜ (7317)
Representative patent attorney close aide Kensuke (1 or 1 person) Figure 2 Figure 3

Claims (2)

[Claims] (1) A paper feed table for stacking forms, a conveyance means for sending out the forms loaded on the paper feed table one by one, and a detection means provided on the conveyance path for detecting that a plurality of forms have been fed. , when multiple sheet feeding is detected by the detection means,
means for driving the conveyance means in a direction opposite to the paper feeding direction to return the plurality of sheets of forms onto the paper feed tray; A paper feeding mechanism characterized by comprising a pressure adjusting means for appropriately adjusting the pressure exerted on the forms so that the forms are conveyed one by one. (2) The conveyance means includes a feed roller provided above the paper feed tray, a pick roller that conveys the form in contact with the top surface of the form sent out from the feed roller, and a pick roller provided below the pick roller. It is composed of a reverse roller that faces the roller and contacts the form with appropriate pressure and rotates in a direction opposite to the conveyance direction, and the pressure adjustment section includes a reverse roller pressure adjustment section that adjusts the pressure of the reverse roller, and the feed roller. and a feed roller pressure adjustment section that adjusts the contact pressure with the forms stacked on the paper feed tray.
Paper feeding mechanism described in section.