JPS6247039A - Original inverting type automatic original feeding device - Google Patents

Abstract

PURPOSE:To set surely an original in a fixed position on an original platen and improve the original feeding speed as the whole by changing the original feeding speed in accordance with the original feed mode of the double face original copying operation. CONSTITUTION:In an original feed mode A, an original inverting mode C, and an original eject mode E during the double face original copying operation, the voltage applied to an original feeding motor 47 is set to V1 to raise the motor rotative speed and the feeding speed, the carrying speed, and the ejecting speed of the original are increased thereby. In an original front face set mode B and an original rear face set mode D, the voltage applied to the original feeding motor 47 is set to V2 to reduce rather the motor rotative speed, and the original is softly brought into contact with a stopper and is set surely in the fixed position on the original platen without getting over the stopper neither rebounding from the stopper.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a document reversing type automatic document feeding device that improves document feeding speed.

(Prior art) In many conventional copying machines, when copying multiple originals, the user places the originals one by one on the original table and replaces them, but when the number of originals to be copied increases, the user has to place the originals one by one on the original table and replace the originals while standing. The replacement work is quite difficult. Recently, an automatic document feeder has been developed that automatically feeds multiple documents one at a time and sets them in the specified position on the document table for copying. It has been put into practical use.

By the way, there are many so-called double-sided originals that have content that you want to copy on both sides, so an automatic document feeder that can be used for such double-sided originals has been devised. The device □ first copies the front side of the original, then reverses the original, copies the back side, and ejects it. The front and back sides are copied in the same way one after another, and the originals are ejected one after another. .

Now, improvement in copying speed is always desired, but
In order to improve the copying speed of a copying machine that uses this type of document reversing automatic document feeder, it is necessary to increase the conveyance speed of copy paper in relation to the electrophotographic processing speed within the copying machine body, and to There is a need to improve the document feeding speed by a reversing automatic document feeder. If we only think about improving the document feeding speed, it is easy to increase the document feeding speed. There is a problem in that it is difficult to set in a fixed position because it climbs over the stopper or bounces off the stopper, which limits the feeding speed. The purpose of this system is to improve the document feeding speed while ensuring that the document is set correctly.To achieve this purpose, the document feeding speed is changed depending on the mode during document feeding. Configured.

(Example) The present invention will be explained below based on the drawings.

FIG. 1 shows a document reversing type automatic document feeder according to the present invention.

The automatic document feeder consists of a document placement plate l on which documents are stacked and a feed roller 2 that feeds out only the topmost document.
, a feeding belt 4 that feeds the fed document in cooperation with a double feeding prevention roller 3, and a roller 5 for feeding the document disposed along the document feeding path. A conveyor belt 6 that conveys the original to a fixed position on a glass original table (not shown) of the copying machine main body, an original reversing guide 7, and three sets of reversing rollers 8a arranged along the original reversing guide 7. 8b
, 8c, and guide rollers 6a, 6b, and 6c are arranged along the conveyor belt 6. This conveyor belt 6
is driven by the drive roller 6d, and is switched between the forward rotation direction shown by the solid arrow and the reverse rotation direction shown by the broken line arrow between the driven roller 6e and the driven roller 6e. A stopper 9 is provided near one end of the conveyor belt 6 to stop the conveyed document at a fixed position on the glass document table. and is driven electromagnetically. Hara ma? The first document feeding path from plate 1 to the fixed position on the glass document table and the second document feeding path along the document reversing guide 7 form a common path in section C. Light-emitting element 1 that detects passage of a document
A document detection sensor consisting of a light receiving element 0a and a light receiving element Job is provided. 11 is a document discharge roller that discharges the exposed document; 12 is a document discharge device that stores the discharged document;
Reference numeral 13 denotes a document discharge sensor that detects that the document is discharged.

In this document reversing type automatic document feeder.

Feeding roller 2, double feeding prevention roller 3, feeding belt 4.
Original feed roller 5. Drive roller 6d of conveyor belt 6, reversing rollers 8a, 8 disposed along document reversing guide 7
b and 8c are each configured to be driven by one document feeding motor via a clutch or gear,
Among these, the rotation direction of the drive roller 6d changes when the rotation direction of the motor is changed, but the other rollers are rotated in one direction via a clutch mechanism regardless of the rotation direction of the motor.

FIG. 2 is a block diagram of a document feeding speed control circuit of an automatic document feeding apparatus according to the present invention.

In the figure, 40 is a copy start button that is turned on when copying starts, 41 is a double-sided copy button that is turned on when copying a double-sided original, 42 is a copy number setting button consisting of a numeric keypad for setting the number of copies you want to make, and 43 is an electronic photo. A paper discharge sensor 44 detects when the processed copy paper is discharged outside the copying machine main body; 44 indicates the state of the copy start button 40 and the double-sided copy button 41; and the number of copies set by the copy number setting button 42; A memory 45 temporarily stores the output status of the paper discharge sensor 43, etc., and determines whether the front side or the back side of the document is being copied from the data stored in the memory 44 according to a predetermined program, and then reverses the document or discharges the document. The CPU 46 that outputs the command is a drive circuit that drives the document feed motor 47, and this document feed motor 47 drives at least the drive roller 6d of the conveyor belt 6 via the clutch and gears as described above. It is configured as follows: a copy start button 40, a double-sided copy button 41, a copy number setting button 42, a paper ejection sensor 43, a memory 44, and a CPU.
45 and the drive circuit 46 are both provided on the copying machine main body side, and the CPU 45 controls both the original feeding sequence of the automatic document feeding device and the electrophotographic process sequence within the copying machine main body. .

Next, the copying operation according to the present invention will be explained using the time chart shown in FIG. 3 and the flow chart shown in FIG. In the following description, in order to simplify the explanation, it is assumed that the front and back sides of each double-sided document are copied once each.

First, place multiple double-sided originals that you want to copy on the original plate l, stacking them in page order from the top with the odd-numbered pages facing up, then press the double-sided copy button 41 and set the desired number of copies (
If the desired number of copies is 1, no setting is required), the CPU 45 determines that the duplex copy mode is in effect from the state of the duplex copy button 41 (F-1), and then turns on the copy start button 40 (see Figure 3 (a)). ), the document feed mode is entered, the maximum voltage V1 is applied to the document feed motor 47, and the document feed motor 47 rotates in the normal direction, rotating a series of rollers of the automatic document feeder (see figure (b)). The uppermost document on the placing plate L is sent out by the sending roller 2, and is fed by the feeding belt 4 and the feeding roller 5, and then sent to the conveying belt 6 (F-
2) During the document feeding, the leading edge of the document emits light, and the light receiving element 1
0a.

When it passes the position of the original detection sensor lO consisting of 10b (F-3), the output of the light receiving element iob rises as shown in FIG. Enter set mode. In synchronization with this rise, the stopper 9 is actuated and protruded, and the CPU 45 outputs a signal to the drive circuit 46 to lower the voltage applied to the document feed motor 47 (F-4). As a result, the drive circuit 46 is lower than Vl■2 is motor 47
is applied to When a time tl set by a timer set in the CPU 45 has elapsed from the rise of the output signal of the document detection sensor 10, the document feeding motor 47 is stopped. At this time, the leading edge of the original contacts the stopper 9 and is set in a fixed position on the glass original platen of the copying machine (at this time, the front side of the original (odd page side) is facing downward) (F-5
).

On the other hand, on the copying machine main body side, a series of electrophotographic processes begins, starting with exposure of the original using the optical scanning system (F
-6). The visible image formed on the photoreceptor in this way is transferred to the copy paper fed from the paper cassette, fixed by the fixing device, and then ejected to the paper output tray. As a result, the paper discharge sensor 43 is turned on.

The CPU 45 determines that the front side copy mode has ended based on the output from the paper discharge sensor 43 provided on the copying machine main body.
-7), outputs a motor reverse rotation signal CCW to the drive circuit 46; As a result, the document feed motor 47 is rotated in the reverse direction (F-8).
, enters document reversal mode. At this time, the voltage applied to the motor 47 is set to 1, the motor 47 is rotated at a high speed, and the original, which had been in a fixed position, is transported by the transport belt 6 in the opposite direction (in the direction of the dashed arrow) to the reversing section. The document is guided through the document reversing guide 7 by the reversing roller 8a.

It is conveyed in the direction of the arrow by 8b and 8c (F-9). C
The elapsed time is measured by a timer set in the PU 45, and when the predetermined time t2 has elapsed, a motor forward rotation signal CW is output in place of the motor reverse rotation signal CCW that had been output until then, and the motor 45 is thereby rotated in the forward rotation. Switch. On the other hand, at this time, the leading edge of the original that has been reversed by the reversing unit has reached the common path C, and as it continues to advance, the leading edge of the original passes the position of the original detection sensor 10 (F-10), and the conveyor belt 6 After reaching the original position, the original is continued to be transported by the transport belt 6 toward a fixed position for exposure on the glass original table. The document reversal mode ends when the output of the document detection sensor 10 rises. As shown in Figure 3 (b), the document feed motor 4
7, from the rise of the output of the document detection sensor 10, the applied voltage is lowered to V2 to slow down the document conveyance speed (F-11), and the operation is stopped when the time t1 set by the timer has passed. The period from the rise of the output of the document detection sensor IO to the stop of the document feed motor 47 is the document back side setting mode. At this time, the document is stopped by the stopper 9 and remains at a fixed position on the glass document table.

The original is placed with the back side facing down (F-12)
.

Thereafter, a series of electrophotographic processes are performed on the back side of this document (F-13), and the document is discharged. At this time, when the paper ejection sensor 43 provided on the copying machine main body side detects the paper ejection,
As the stopper 9 moves away from the document transport path, the CPU 4
Motor reversibility CCW is output from 5. At this time, the document ejection mode is entered, and the voltage 1 is applied to the document feed motor 47 again via the drive circuit 46, and the document is reversed (F-14), and the copied document is guided to the reversing section where it is reversed. After the original feeding motor 47 is switched to normal rotation (
(See FIG. 3(B)) (F-15) The next document is fed after waiting for an output from the document discharge sensor 13 (see FIG. 3(E)).

In order to confirm the effects of the present invention, the original feeding speed was fixed at 800 mm/sec as in the conventional case, 1000 mm/sec at high speed (when voltage v1 is applied) as in the present invention,
Comparing the number of sheets fed per minute when feeding A4 size originals at low speed (when voltage v2 is applied) and when switching to 800 mm/sec, it is 20.8 sheets in the conventional case. In contrast, in the present invention, the number of sheets is 24.8, indicating that it is possible to increase the number of sheets fed.

In this way, in the document feeding mode A during double-sided document copying, the original/document reversing mode C, and the document ejection mode E, by setting the voltage applied to the document feeding motor 47 to 1, the rotation of the motor is controlled. The speed is increased to increase the speed of feeding, transporting, and ejecting the original, and in the front-side original setting mode B and back-side original setting mode D, the motor rotation speed is slightly lowered by setting the voltage V2 to the original feeding mode 47. The document can then be brought into loose contact with the stopper, and the document can be reliably set at a fixed position on the document table without going over the stopper or bouncing off the stopper.

In the above embodiment, the document feeding speed during double-sided document copying is set to 2.
Although the document ejection speed is changed to three stages, the speed at which the original is ejected may be increased to three stages, and by doing so, the copying speed can be further improved.

(Effects of the Invention) As explained above, in the present invention, the document feeding speed is changed according to the document feeding mode in the double-sided document copying operation, so that the document is reliably placed at the fixed position on the document table. In addition, the overall document feeding speed can be improved, and the copying speed can be improved.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a document reversing type automatic document feeder according to the present invention, FIG. 2 is a block diagram of a document feeding speed control circuit of the automatic document feeder according to the present invention, and FIG. 3 is a block diagram of the document feeding speed control circuit of the automatic document feeder according to the present invention. Time chart of document feeding operation by automatic document feeding device,
FIG. 4 is a flowchart of the document feeding operation. ■...Document placement plate, 6...Conveyor belt, 7...Document reversal guide, 9...Store/par, 10...Document detection sensor, 11...Document ejection roller, 12... ...Manuscript discharge sensor patent applicant Konishiroku Photo Industry Co., Ltd. Agent Patent attorney Hiroshi Suzuki Male lineage 1 Figure 2

Claims (1)

[Claims] A document reversing type automatic document feeder comprising: a mode detection means for detecting a document feeding mode in a double-sided document copying operation; and a speed control means for changing the document feeding speed according to the document feeding mode.