JP2003285946A - Paper feeding mechanism of automatic paper feeder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To feed a precedent return cut sheet from the same paper feeding table in advance while keeping a reading order of the fed cut sheets in a simple mechanism. <P>SOLUTION: When paper jam of the cut sheets occurs in a paper feeding process from a paper feeding part 1 to a paper ejecting part 10, or a handling failure of a handling part 8 of the cut sheets occurs, a paper feeding roller 3 for feeding the cut sheets from the paper feeding table 5 is reversely rotated. The following cut sheet grappled by the paper feeding part is returned to the paper feeding table side. After the tip of the following cut sheet passes through a first detecting sensor 9, the paper feeding roller 3 is stopped in a state where the tip is grappled by the paper feeding roller 3 and a driven roller 4. The precedent cut sheet having running failure or reading disturbance is placed on the following cut sheet. This placed precedent cut sheet is fed by the normal rotation of the paper feeding roller. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic paper feeder for continuously transporting and processing cut sheets such as a printing machine, a copying machine and a mark sheet reader at a constant interval. Paper feed mechanism. 2. Description of the Related Art Conventionally, in a copying apparatus, an optical mark reading apparatus (OMR), an optical character reading apparatus (OCR), etc., several hundred sheets of recording paper, cut sheets of copy paper and entry sheets are stacked. From the heavy state, high-speed conveyance processing is performed for each sheet. As an automatic paper feeder that feeds the cut sheets one by one from the paper feed tray, the cut sheet fed from the paper feed tray to control the transport of cut sheets throughout the device until the paper is discharged after the processing is completed. Microswitches and photosensors are arranged at a plurality of locations as detection sensors for detecting the passing state, and the passing state is detected by changing the level of these detection sensors. In the event of a transport failure due to a paper jam or a mark sheet reading failure during the transport process of this cut sheet, stop feeding the cut sheet from the paper feed table, and remove the preceding cut sheet from the transport process or paper discharge unit, respectively. Then, the subsequent cut sheet at the sheet feeding position is returned to the sheet feeding table, and sheet feeding is restarted by rotation of the sheet feeding roller. For example, Japanese Utility Model Laid-Open Publication No. 3-56752 discloses a paper feed mechanism having a head roller for pressing a recording sheet and a discharge roller for conveying the recording sheet. When the recording paper that is driven by the electric motor and fed from the head roller is entangled with the discharge roller, the electric motor is reversed by the changeover switch, and the head roller and the discharge roller are rotated in the opposite sheet feeding direction to print the recording paper. It is stated to return. Japanese Patent Application Laid-Open No. 2-144334 discloses a paper feed mechanism in which a feed roller that presses against a sheet material on a paper feed table, a feed roller that feeds the fed sheet material, and a double feed prevention roller are arranged. Is described, and only one sheet is reliably fed. When two sheets are fed, the double feed prevention roller is reversed,
The sheet is returned to the sheet feeder. Further, Japanese Unexamined Patent Application Publication No.
In Japanese Patent Application Publication No. 0-218403, a pick roller for feeding out a sheet on a hopper (sheet feeding table) and a separation pad for pressing the pick roller to prevent two sheets from being fed are provided, and a sheet feeding operation is continuously performed. When the sheet feeding operation is completed, the pick roller is reversely rotated so that the sheet held between the pick roller and the separation pad is returned into the hopper, and the position of the hopper is restored to the sheet feeding start position. ing. In the automatic paper feeder, when a trouble occurs during the paper feeding / conveying process, the paper is fed out from the paper feeding position on the paper feeding table by the paper feeding roller. Various mechanisms have been devised for returning the succeeding cut sheet to the sheet feeding table, but all have the following problems. For example, in the apparatus described in Japanese Utility Model Laid-Open Publication No. 3-56752, the cut sheet is operated by a changeover switch of the electric motor, and the returned cut sheet is fed as it is. I can't. In the apparatus disclosed in Japanese Patent Application Laid-Open No. 2-144334, a double feed prevention roller and a feed roller are arranged, and further, a feed roller is required, the mechanism is complicated, and the sheet-like material is rotated by the reverse rotation of the double feed prevention roller. The return distance is specified,
The reversal of the feed roller and the feed roller by the one-way clutch is controlled, and the sheet-like material cannot be completely returned to the sheet feeding table. Therefore, even if the preceding sheet-like material is returned to the sheet feeding table, re-feeding cannot be performed. In the apparatus disclosed in Japanese Patent Application Laid-Open No. 10-218403, only an operation control program for forward / reverse rotation of a pick roller and up / down movement of a hopper is described. However, in a conventional automatic paper feeder,
If the cut sheet continuously fed from the paper feed table becomes jammed or a mark reading error occurs during conveyance and the feed roller stops feeding, feed the preceding cut sheet without changing the feed order. Therefore, a complicated paper feeding mechanism was required. Generally, the preceding cut sheet jammed is removed and the paper feeding operation is restarted. Therefore, the paper feeding order has been changed. In order to make the paper supply order the same, two paper supply positions are provided, and a cut sheet with poor reading or a preceding cut sheet with paper jam is supplied from a paper supply position different from the paper supply table. Was. SUMMARY OF THE INVENTION The present invention solves the conventional problem of the feeding order of the preceding cut sheets having poor reading, and eliminates a complicated feeding mechanism such as providing a plurality of feeding positions. SUMMARY OF THE INVENTION An object of the present invention is to provide a simple mechanism for maintaining a reading order of cut sheets to be fed and feeding a return cut sheet preceding from the same sheet feed table ahead of a subsequent cut sheet on the sheet feed table. An object of the present invention is to provide a paper feeding mechanism of a paper device. An object of the present invention is to provide an optical mark reader (OMR) and an optical character reader (OCR).
In such a case, the mark sheet that has been fed and has a reading error is temporarily stopped at a position where it can be easily taken out separately from the cut sheet that has already been ejected, so that the cut sheet can be easily removed. An object of the present invention is to provide a sheet feeding mechanism of an automatic sheet feeding apparatus which is placed on the sheet feeder and in which a sheet feeding operation is started in order. The above object of the paper feed mechanism of the automatic paper feeder of the present invention can be achieved by the following constitution. The automatic paper feeder continuously feeds cut sheets from a paper feed table to a copying or reading position by a paper feed roller and discharges the processed cut sheets to a paper discharge unit by paper discharge rollers. , The leading end slides up and down along the regulating guide plate, and the leading end is always urged by the elastic member toward the paper feed roller side, and the paper feed table is supported by the frame. Placed at the tip,
A paper feed roller having a friction member having an uneven surface and a driven roller pressed against the paper feed roller are rotatably supported on a frame body,
A sheet feeding unit for feeding a cut sheet from the sheet feeding table by the sheet feeding roller and the driven roller, and an upper side fixed to a frame so as to guide the cut sheet placed on the sheet feeding table to the sheet feeding roller; A guide plate and a regulating guide plate, a first detection sensor disposed downstream of the paper feed roller to detect a cut sheet fed from the paper feeding unit, and a copy of the cut sheet fed from the paper feed unit. , Printing, mark reading, etc., a processing section having a plurality of pairs of conveying rollers for conveying the cut sheet, and guiding the cut sheet conveyed by the conveying rollers downstream of the processing section. A paper discharge guide plate, a paper discharge roller, and a paper discharge unit for stocking the discharged cut sheet, wherein a paper discharge process from the paper supply unit to the paper discharge unit is performed. When a paper jam of a cut sheet or a processing failure of the cut sheet processing unit occurs, the rotation of the paper feed roller for feeding out the cut sheet from the paper feed table is reversed, and the subsequent cut sheet nipped by the paper feed unit is rotated. Is returned to the sheet feeding table side, and after the leading end of the succeeding cut sheet passes through the first detection sensor, the leading end of the succeeding cut sheet is sandwiched between the sheet feeding roller and the driven roller. Stop, and place the preceding cut sheet on which the running cut or the reading failure has occurred on the succeeding cut sheet, and feed the loaded preceding cut sheet by the forward rotation of the feed roller. This is the paper feed mechanism of the device. The paper feed mechanism of the automatic paper feeder of the present invention changes the stacking order of cut sheets by returning the cut sheets having a paper jam or the cut sheets having a processing failure in the processing section to the paper feed table again. Without returning, the return cut sheet is placed on the cut sheet on the paper feed table, and the paper can be reliably fed by the paper feed roller with a simple mechanism. In a state where the subsequent cut sheet is sandwiched between the sheet feeding rollers, the return cut sheet can be stacked and reliably fed back, so that the sheet feed processing time can be reduced. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A paper feed mechanism of an automatic paper feeder according to the present invention will be described in detail based on an embodiment shown in the drawings. FIG. 1 is a schematic explanatory view of a sheet feeding section of an embodiment of a sheet feeding mechanism of an automatic sheet feeding apparatus of the present invention. FIG. 2 is a schematic explanatory view of a reading device and a discharge unit according to the embodiment of the automatic sheet feeding device of the present invention. FIG. 3 is a time chart of the sheet feeding mechanism of the automatic sheet feeding apparatus of the present invention. The paper feeding section of the automatic paper feeder will be described.
On a side plate 2 of the frame of the sheet feeding unit 1, a sheet feeding roller 3 serving as a sheet feeding unit having a surface formed with a friction member with unevenness is rotatably supported. A driven roller 4 that comes into pressure contact with the paper feed roller 3 is also supported by the side plate 2. A regulating guide 6 at the leading end is arranged so that the uppermost cut sheet P stacked on the sheet supply table 5 is supplied to the pressure contact position between the sheet supply roller 3 and the driven roller 4. The paper feed table 5 is supported by the side plate 2, and the leading end thereof is urged so as to be constantly pressed against the paper feed roller 3 along the regulation guide 6 to move up and down. An upper guide 7 is fixed to the paper feed roller 3 side of the paper feed table 5. A reading device 8 is a processing unit for the cut sheet P. A pair of a front conveyance roller 11 and a rear conveyance roller 12 for conveying the cut sheet P to the paper supply unit 1 and the paper discharge unit 10 are provided on the shaft. I have. A first detection sensor 9 for the cut sheet P passing therethrough is provided upstream of the front conveyance roller 11. A reading unit 14 that reads a mark on the cut sheet P is disposed between the front conveyance roller 11 and the rear conveyance roller 12. A second detection sensor 13 for the cut sheet P is provided between the reading unit 14 and the front conveyance roller 11. On the other hand, a third detection sensor 15 is provided upstream of the rear conveyance roller 12. The paper discharge section 10 takes out a paper discharge stacker 16 for stacking the processed cut sheets P, a guide plate 17 for guiding the cut sheets P conveyed from the rear conveyance rollers 12, a guide roller 18, and the cut sheets P. Paper exit 19
It is composed of The guide plate 17 is provided with a step 17a for temporarily placing the rear end of the conveyed cut sheet P. The operation of the paper feed mechanism of the automatic paper feeder according to the present invention will be described with reference to an embodiment shown in the drawings. As shown in FIG. 1, in a state in which the leading end of a cut sheet P such as a mark sheet placed on the paper feed table 5 is in contact with the paper feed roller 3, the paper feed roller 3 is moved in the paper feed direction by the paper feed command signal. Then, the cut sheet P advances while being bitten by the sheet feeding roller 3 and the driven roller 4, and is fed while being guided by the upper end of the regulation guide 6. The fed cut sheet P passes through the first detection sensor 9 and is fed by the front conveyance roller 11, passes through the second detection sensor 13, and the reading section 14 reads the entry mark of the cut sheet P. . After passing through the third detection sensor 15, the read cut sheet P is fed by a post-conveyance roller 12 to the sheet discharge section 10.
Transported to The tip of this cut sheet P is a guide plate 1
7 and the rear end of the cut sheet P is stepped 17a.
Is reached, the cut sheet P is separated from the conveying roller 12 and stopped. The leading end of the stopped cut sheet P jumps out of the paper discharge port 19 and protrudes from the upper end of the cut sheet P already stocked. The leading end of the succeeding cut sheet P reaches the step 17a, and the preceding cut sheet P
Is pressed by the succeeding cut sheet P, and the preceding cut sheet P is dropped by the discharge stacker 16 and is stocked as a processed cut sheet. In this way, the cut sheets are processed and stocked continuously. The paper feed mechanism of the automatic paper feeder of the present invention will be described with reference to a time chart shown in FIG. Turn on the main switch (not shown) of the automatic paper feeder,
The sheet feed table 5 rises and the leading end of the cut sheet P placed thereon comes into contact with the sheet feed roller 3. The feed roller 3 rotates forward. With the first detection sensor 9 turned on, the front transport roller 1
1, the cut sheet P is fed and processed by the reading unit 14, and the cut sheet P is fed to the paper discharge unit 10 by the rear conveyance roller 12. When a signal indicating that the cut sheet P has a reading error is generated, the paper feed roller 3 stops, and the feed roller 3 rotates in reverse and the leading edge of the cut sheet P is retracted from the first detection sensor 9 and turned off. The feed roller 3 stops, and the cut sheet P enters a standby state. On the cut sheet P, the preceding cut sheet stopped at the step 17a of the sheet discharge guide 17 is picked up and placed back. Paper feed roller 3
And the cut sheet P is fed forward. The paper feed mechanism of the automatic paper feeder according to the present invention comprises:
The paper feed roller that feeds out cut sheets such as recording paper, copy paper, and mark sheets from the paper feed table is rotated forward, continuously feeds the cut sheets at predetermined intervals to the processing unit, and reads the paper discharged to the paper output stocker. A defective cut sheet can be taken out, placed on a succeeding cut sheet of the sheet feeding table, and fed reliably. In addition, the cut sheet can be fed by a simple mechanism, and the cut sheet having the poor reading can be returned to the sheet feeding table and fed again in order.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic explanatory view of a sheet feeding unit of an embodiment in a sheet feeding mechanism of an automatic sheet feeding apparatus of the present invention. FIG. 2 is a schematic explanatory view of a reading device and a discharge unit of the embodiment of the automatic sheet feeding device of the present invention. FIG. 3 is a time chart illustrating a sheet feeding mechanism of the present invention. [Description of Signs] 1... Paper feed unit 2... Side plate 3... Paper feed roller 4. 11 front conveyance roller 12 rear conveyance roller 13 second detection sensor 14 reading unit 15 third detection sensor 16 discharge stacker 17 guide plate 18 guide roller 19 discharge outlet

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Claims (1)

Claims: 1. A cut sheet is continuously fed from a feed table to a copy processing or reading processing position by a feed roller, and the processed cut sheet is discharged to a discharge section by a discharge roller. In an automatic paper feeder for discharging paper, a leading end slides up and down along a regulating guide plate, and the leading end is constantly urged by a resilient member toward a feed roller side, and is supported by a frame body. A paper feed roller disposed at the end of the paper feed table and having an uneven friction member on its surface, and a driven roller pressed against the paper feed roller are rotatably supported on a frame, and the paper feed roller A paper feed unit for feeding a cut sheet from the paper feed table while being sandwiched between the paper feed table and a driven roller; and an upper guide fixed to a frame so as to guide the cut sheet placed on the paper feed table to the paper feed roller. Board and regulatory guide A plate, a first detection sensor arranged downstream of the paper feed roller so as to detect a cut sheet fed from the paper feeding unit, and copying, printing, and reading a mark of the cut sheet fed from the paper feeding unit. A processing section in which a plurality of pairs of transport rollers for transporting the cut sheet are disposed, and a paper ejection guide plate for guiding the cut sheet transported by the transport rollers downstream of the processing section, A paper discharge unit for arranging a paper discharge roller and stocking the discharged cut sheet, and processing of a paper jam of the cut sheet and a cut sheet during a paper feeding process from the paper supply unit to the paper discharge unit. When a processing failure occurs in the sheet feeding unit, the rotation of the sheet feeding roller is reversely rotated, and the subsequent cut sheet nipped by the sheet feeding unit is returned to the sheet feeding table side. After passing through the first detection sensor, the feed roller is stopped in a state where the leading end of the succeeding cut sheet is sandwiched between the feed roller and the driven roller, and the preceding cut sheet having a running defect and reading trouble is removed from the succeeding cut sheet. A sheet feeding mechanism of an automatic sheet feeding device, wherein the sheet is placed on a cut sheet, and the placed cut sheet is fed by forward rotation of the sheet feeding roller.