JPS6046544A - Sheet original feeding method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for automatically feeding sheet originals in an electrophotographic apparatus such as a copying machine.

2. Description of the Related Art Conventionally, when automatically feeding sheet originals in an electrophotographic apparatus, the configuration is such that the operation is performed when an original presence/absence detection sensor in an original supply section detects the presence of an original. This document presence/absence detection sensor also performs so-called jam detection, which also detects whether automatic feeding has been performed smoothly. Note that some devices are provided with a jam detection sensor separately from the document presence/absence detection sensor. In any case, when such a sensor detects that a document remains, it is determined that the document is jammed, and the electrophotographic apparatus is configured not to start a photographing operation. If you feed a document that is longer than a standard sheet document (especially in the document feeding direction), the sensor in the document feeder will detect the presence of the document even if the leading edge of the document reaches the specified position on the document table, so it will be judged as a jam. and do not perform copy shooting operations. Therefore, fold the original, cancel automatic document feeding,
There is the hassle of having to manually place the original on the document table and copy it. In some cases, it is possible to cut the original and copy it, but this is time-consuming and requires the effort of re-editing and re-pasting the cut original.

In particular, recently, computer output paper is often used as a copy manuscript, and the sizes of such manuscripts are diversifying, with many long ones. Therefore, the conventional document feeding method described above is extremely inconvenient.

The present invention is intended to eliminate such disadvantages and inconveniences, and an object of the present invention is to provide a sheet document feeding method for electronic photography that can smoothly feed and photograph a sheet document that is longer than a standard sheet document. shall be.

To achieve this object, the present invention has a method for feeding a sheet original onto a document table, and when a sensor in a sheet document supply section detects the presence of a sheet document, a predetermined amount of a sheet document is fed onto the document table. The sheet original is fed by the same length as the sheet original, and the original image of the sheet original being fed to the original platen is recorded, and even after recording, the sensor detects whether the sheet original is
The gist is that if it is detected, the document is fed again and the recording process is repeated.

Hereinafter, embodiments of the present invention will be described in detail to clarify the above configuration.

FIG. 1 is a perspective view of a main part of a sheet original feeding section of an electrophotographic apparatus used to carry out the present invention.

In the figure, l is the paper feed tray for automatic document feeding (DF) (dashed line water), 2 is a document presence/absence detection sensor, and 3 is a document holding solenoid, which moves the document holding roller 4 up and down with respect to the document. It is for. 5 is the document feed roller, 6 is the DF
The drive motor 7 is a clutch. 8 is a conveyor belt 9 (
A drive roller 10 drives the belt 9 (dashed line), and a presser roller 10 presses the belt 9 against the document to provide conveyance properties. Reference numeral 11 denotes a clock plate, which is rotated by a clutch 7 in synchronization with the motor 6. 12 is a sensor for detecting pulses from the clock board 11; 13 is the clutch pawl 14 set to 0
A document feed solenoid is set to N-OF and F, 15 is V, a sensor detects the leading edge of the document, and 16 is a brake. 17
Reference numeral 18 indicates a turn roller driven by the conveyor belt 9, a discharge roller 18 interlocks with the turn roller 17, and 19 a document discharge tray (dashed line).

FIG. 2 is a block diagram of a circuit that controls the operation of the sheet document feeding section of the electrophotographic apparatus. In the figure, reference numeral 100 denotes a sequence controller of the main body of the electrophotographic apparatus, of which only the portion necessary for automatic document feeding control is shown. l
ot is the automatic document feeder (D'F) controller, and C
It consists of a microcomputer including a PU-ROM-RAM and an interface with external signals, and since the details are well known, their explanation will be omitted.

The main body controller 100 receives a copy size signal 49 selected by an operation switch (not shown) provided on the operation panel of the electrophotographic apparatus, an automatic document feed (or manual placement) signal 50, and a copy magnification signal. 51 enters. On the other hand, from the DF controller 101, a signal 54 is input when the feeding of the original is completed and it is possible to take a photograph.From the roller 100, an automatic feeding signal 53, a photographing signal 55, and a clock pulse signal are input. 56 outputs and inputs it to the DF controller 101. In addition, DF controller 10
A document detection signal 57 from the document presence/absence detection sensor 2, a document detection signal 58 from the document leading edge detection sensor 15, and a clock signal 59 from the clock pulse detection sensor 12 are input to 1. In addition, from the DF controller E01, a drive signal for the solenoid 3 (original holding signal), a drive signal for the solenoid 3 (original holding signal), a drive signal for the 60φ slip/a F'13 (original feed signal), a drive signal for the DF motor 6, a drive signal 62 for the clutch 7, a drive signal for the brake 16, and a drive signal for the brake 16 are sent. Drive signal 6
4 is output. These drive signals are connected to each device via a drive circuit (not shown).

With the control circuit having such a configuration, the DF controller 101
The operating procedure is stored in the ROM, and the operation is performed according to the stored information. A flowchart of the operating procedure is shown in FIG. The operation of each device will be explained below according to the flowchart.

When automatic document feeding is selected by the operator, the signal 50 is input as a signal 53 to the DF controller 101 via the main controller 100. Further, when the copy size is selected, the signal 49 is input to the main body controller 100, and when the copy magnification is selected, the signal 51 is input to the main body controller 100. Based on the copy size and copy magnification, the main body controller 100 determines the feed timing clock pulse signal 56 for feeding the document. In this embodiment, 754.7 clock pulses are generated per second, and the document is fed by 0.53 mm during one clock. For example, if the transfer paper is A3 size and is fed vertically, and you want to copy at the same size, 420/
1.010.53 near 93 clock, A4 vertical feed 0.
29710.8110.53- for 81x reduced copying
= H2 clock. The current copy size is A3 size.
When equal magnification is selected as the copy magnification, the clock pulse signal 56 becomes 793 clocks.

The DF controller 101 operates in response to the signal 53, and in step 111 of the program, the sensor 2 determines the presence or absence of a document. When a document is set on the paper feed tray L, the sensor 2 detects the document cloth, and in step 112, the document holding solenoid drive signal 60 is output, the solenoid 3 is turned on, and the document holding roller is activated. It is determined in step 113 whether or not. Since we are not taking photographs at the beginning of the photograph, there should be no signal 55 indicating that the photograph is being taken.
Proceed to Step 114. During the repetition of the automatic document feeding operation and the photographing operation, if the photographing operation is in progress, the signal 55 is output, and the process waits until the photographing is completed and steps 114 are performed.
Proceed to. In step 114, the drive signal 62 for the DF drive motor 6 is output, and the DF drive motor 6 rotates. Next, in step 115, a drive signal for the clutch 7 is output, the clutch 7 is activated, the belt drive roller 8 is rotated, and the belt 9 starts rotating. At the same time, the clock plate 11 starts rotating. At this point, the counter built into the DF controller starts counting the clock T (step 116).
). As the clock plate 11 rotates, a pulse signal is generated at the sensor 12. After 200 clock pulses have been passed (step 117), the DF clock T1 is stopped (step 118). Then, the leading edge of the document moves from the position of sensor 2 to the position of sensor 15. In step 119, a drive signal 61 for the solenoid 13 is issued to drive the solenoid 13, and by releasing the clutch pawl 14, the document holding roller 4 and the document feeding roller 5 start rotating, and feeding of the document is started. . When the sensor 15 detects the leading edge of the document (step 120), the solenoid 3
is stopped (step 121), and the document holding roller 4 is raised.

In step 122, the clock T of the DF controller 101 is
2 counts the clock pulses of sensor 12. During this count, the document is fed by the belt 9.

When clock T2 counts 922 clocks (step 123), the counter stops (step 124).
. At the same time, the drive signal 64 for the brake 16 (step 126
).

Stopping the drive signal 63 for the clutch 7 (step 127);
Stopping the drive signal 62 of the DF drive motor 6 (step 12
8), the document is fed to the photographing position on the document table and stopped. Note that 922 clocks is the time required for the leading edge of the document to be conveyed by the belt 9 from the position of the sensor 15 to the end of the photographing fixed position, and is constant regardless of the document size.

Here, the DF controller 101 is the main controller lO
A signal 54 indicating that the document has been completely fed to the normal position is output to O. Electrophotography is performed according to the sequence of the main body controller 100. During photographing, a signal 55 is output to the DF controller so that the DF motor 6 and other components are not driven. When the signal 55 disappears, the next step 129 detects the sensor 15.
determines whether there is a manuscript or not. If the document is on the right, the length of the document is longer than the standard length, so it is fed again. Belt 9 by steps 130-131 and 132
starts conveying the document, and in step 133 the DF
Clock T3 starts counting. This clock number T
3 is the DF controller l from the controller 100 of the main body.
It is sent to O1 as No. 56, and changes when the transfer paper size or copy magnification is changed. In this embodiment, since the same size of A3 size is selected, T3=793 clocks. After counting 793 clocks in step 3.34-135, the program returns to step 125 and repeats the same operation.

Even after feeding the original for a predetermined clock T3, if the original presence/absence detection sensor 15 continues to detect the original force as in the previous time, the next original is further fed. The feeding length is only a predetermined clock T3.

Thereafter, the feeding operation and the copying operation are continued in the same way, and when the document heat is detected in step 129 (this means that the trailing edge of the document has passed), the document is fed by the predetermined clock T3 of this time, Complete subsequent copy operations. after that,
Turn on the DF drive motor 6 and clutch 7 for about 100 minutes.
When the belt 9 is driven by 0 clock, the paper discharge roller 18 is also driven and the document is discharged onto the paper discharge tray 19.

With the above steps, automatic document feeding ends.

Although the automatic document feeder operates as in the above embodiment, the gist of the present invention is shown in the flowchart of FIG. As shown in the figure, when automatic feeding is started, fg, as long as there is a document in the document supply section, feeding and photographing a certain length are repeated. When there are no more originals in the supply section, the automatic original feeding enters the end stage and the final image is taken and the original is ejected.

In the case of a long original, copying and photographing operations are performed repeatedly in this way, so there is no need to fold the original and place it on the original table, or to cut the original and make copies, which is convenient.

In addition, when automatically feeding a long original, the method described in Example L is used, but when copying a standard length original, a changeover switch or the like is provided so that the normal mode can be selected. You can leave it there. In this case, when the normal mode is selected, the sensor in the document supply section can be used as a jam detection sensor.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of essential parts of an electrophotographic apparatus for carrying out the present invention, FIG. 2 is a control block diagram thereof, FIG. 3 is a flowchart of a control program, and FIG. 4 is a flowchart of the gist of the present invention. It is. 6 is a DF drive motor, 11 is a clock plate, 12 is its sensor, 15 is an original presence/absence detection sensor, lOO is a main body controller, and 101 is a DF controller.

Claims (1)

[Claims] (1) In the method of feeding a sheet original onto the document table, when a sensor in the sheet document supply section detects the presence of a sheet document, the sheet document is fed onto the document table with a predetermined length of the sheet document. It feeds the sheet original by the same length, records the original image of the sorted original being fed onto the document table, and if the sensor detects that there is a sheet original even after recording, feeds the original again. A sheet document feeding method characterized by repeating feeding and recording.