JPS6363903B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Technical Field> The present invention relates to a control device for a copying machine, and more particularly to a control device for a copying machine of a type that manually feeds a document and cuts the copy paper after the fixing process is completed. It is something.

<Prior Art> The general operation of a copying machine of the type that manually feeds a document and cuts the copy paper after the fixing process is completed will be described with reference to FIG.

An electrophotographic photoreceptor drum 2 is rotatably supported in a clockwise direction approximately at the center of the copying machine body 1, and around it is a charging charger 3, which will be described later, for uniformly charging the surface of the photoreceptor drum 2. A light-condensing photoconductor bundle 4, a developing device 5, a transfer unit 6, an eraser lamp 7, a cleaner unit 8, etc. for guiding the image of the original onto the surface of the photoreceptor drum 2 are arranged in this order.
An image of the document being conveyed in synchronization with the rotation of the photoreceptor drum 2 is projected onto the surface of the photoreceptor drum 2 to form an electrostatic latent image, which is developed into a visible image using toner. The toner image is also transferred to a copy paper P that is conveyed in synchronization with the rotation of the photoreceptor drum 2,
The surface of the copy paper P on which the image has been transferred is heated by the heater 9 to fix it, cut by the cutter 10 and discharged outside the machine, completing the copying process for one sheet.

A copying machine having such a configuration is provided for the purpose of copying a large-sized original, such as a drawing, and uses tracing paper or the like of a size commensurate with the size of the original as the copying paper P. Paper used for copying, such as tracing paper, becomes more difficult to handle as the size increases, and is particularly prone to curling and wrinkling under the influence of heat and humidity, which can lead to paper jams. In this method, the copy paper P is cut after the fixing process is completed, and the paper is continuously held from the paper feeding section to the cutting section, thereby preventing the above-mentioned paper jams and other inconveniences from occurring.
However, this method of transporting copy paper is
Each time a copy is made, the copy paper must be conveyed until the trailing edge of the copied image passes the cutter 10. Therefore, copy paper of a length equivalent to at least the distance from the cutter 10 to the transfer unit 6 is wasted. I had the inconvenience of becoming

In order to prevent this kind of inconvenience, once the number of originals reaches a certain level, they are continuously fed in to minimize the waste of copy paper P, and the control of the copying machine is also controlled in such a way. Normally, it is designed to allow various operations.

When continuously feeding documents like this, the timing of inserting the next document after one page of documents is currently up to the user. In copying, when an original is inserted, the copying operation starts and the conveyance of the copy paper is started. At the same time, along with the output of detection signals for the leading and trailing edges of the original, a cut is made at the leading and trailing edges of the copied image. 10
However, when controlling the operation when continuously inserting originals, the cutter usually only needs to be cut once between the first copy and the next copy. Therefore, there was an inconvenience that copies of irregular sizes could be made depending on the timing of the document insertion by the user.

<Purpose/Summary> The present invention has been made in view of the above points, and an object of the present invention is to provide a control device for a copying machine with less variation in copy size. means for feeding the inserted document in response to this detection signal; and means for detecting that the trailing edge of the inserted document has passed at least the feeding means; The means for setting Δt and the insertion of the next original within the set time, and when the insertion of the original is detected by the means for detecting the insertion of the original, the means for feeding the original is operated, and the insertion of the next original is performed within the set time. The apparatus is further provided with a control circuit that prevents the operation of the means for feeding the original until the copying operation for the preceding original is completed when the original is not inserted.

<Examples> Examples of the present invention will be described below with reference to the drawings.

FIG. 2 shows a circuit configuration when the control device of the present invention is applied to the copying machine shown in FIG. 1, and the specific arrangement of detection switches and the like is shown in FIG.

When the main switch (not shown) is turned on, power is started to be supplied to the heater 9 of the fuser, and when it reaches a predetermined temperature, or when the main switch is turned on,
After a predetermined time has elapsed, the signal turns on a relay (RYA), not shown, and the contact A1 closes. Copy possible indicator lamp PL in this state
lights up and a document (not shown) is inserted from the document insertion slot 11. When the first detection switch SW1 located immediately before the first transport roller 12 detects the leading edge of the document,
As a result, relay RY1 turns on, contact 1a closes, transistor Q1 becomes conductive, and clutch CL1 operates. Clutch CL1
When turned on, the first conveyance roller 12 is driven to rotate, and the document is thereby fed into the machine and transferred to the second conveyance roller 12.
Detection switch SW2 is inserted, its contacts are opened, and lamp PL is turned off.

Although not shown, the first detection switch SW1
When turned on, the circuit that starts the operation of the main motor, eraser 7, exposure lamp 13, charger 3, etc. is operated, and the photosensitive drum 2 starts rotating, and the second, third, and fourth conveyors are activated. roller 1
4, 15, and 16 are each rotated. At this time, the transfer unit 6 has been lifted by the cam device 17, the conveyance of the copy paper P has not started, and the heater 9 has also been retracted from the copy paper surface by a mechanism not shown.

Next, when the document is gripped by the second transport roller 14, the third detection switch SW3 is switched, and the relay is activated by the charge of the capacitor C1.
RY5 is turned on, contacts 5a1 and 5a2 are closed, contact 5b is open, and self-holding occurs when contact 5a1 is closed.
When contact 5a2 closes, relay RY2 turns on, and contact 2
a1 and 2a2 are closed, and 2b is open. When contact 5b opens, transistor Q1 turns OFF, clutch CL1 turns OFF, first conveyance roller 12 stops, and relay 2al closes.
RY2 maintains itself.

The document is further transported, and the leading edge of the document is
When detection switch SW4 is turned on, relay RY3 is activated.
When turned on, contact 3a closes and contact 3b opens. By closing the contact 3a, the transfer operation mechanism 2
0 is turned ON, the above-mentioned transfer unit 6 is lowered by the rotation of the cam device 17, conveyance of the copy paper P is started, the transfer charger 61 is turned ON, and the heater 9 is also moved to the surface of the copy paper P. They are moved so that they are close to each other, and switch SW6 is opened by a mechanism (not shown), releasing the self-holding state of relay RY5. These operations are such that an optical image of the original is projected onto the photosensitive drum 2, and the electrostatic latent image formed on the drum is turned into a toner image by the developing device 5 and reaches the transfer section. , after the operation of the fourth detection switch SW4, with an appropriate delay so that the transfer unit 6 finishes its descent and the conveyance of the copy paper P begins. Note that the cutter 10 operates at a position corresponding to the leading edge of the copied image.

Furthermore, if the rear edge of the document is connected to the first detection switch
1. Passing through the second detection switch SW2,
The second detection switch SW2 closes again and the relay
Capacitor C2 is charged through contact 2a2 of RY2, and timer T starts operating. After a slight delay by timer T, contacts t1 and t2 switch, and by switching t1, capacitor C2
is discharged.

The discharge time of this capacitor C2 is very short, but when the trailing edge of the document is detected by the second detection switch SW2.
The next document is inserted and the first document is inserted during the time from when the second detection switch SW2 closes until the timer T's contact t1 switches, that is, the timer T's set time (△t). When detection switch SW1 is pressed and closed, relay RY1 is activated and contact 1a is closed, transistors Q2 and Q3 are activated by discharge of capacitor C2, and transistor Q1 is activated. Clutch CL1 operates,
At the same time, relay RY6 turns on, contact 6a closes, and transistor Q1 continues to operate, sending the next document into the machine (at this time, relay RY5 turns on
Since it is OFF, contact 5b is closed. ). on the other hand,
The next document is not inserted during the set time (△t) of the timer T, the first detection switch SW1 is not closed, and the transistors Q2 and Q3 are not activated due to the discharge of the capacitor C2, so the clutch is closed.
CL1 does not work.

If the first detection switch SW1 is not pressed by the next document during the set time (△t), the timer T switches the third and third detection switches SW1 as the first document is transported (in the case of single copy). 4 detection switch SW
3. SW4 is turned off one after another, and relay RY3 is turned off by turning off the fourth detection switch SW4.
The contact 3a is opened and the contact 3b is closed.

By opening the contact point 3a, the transfer operation mechanism 20 is sequentially turned off in the reverse order from when the operation was started as described above.
Due to the operation of the auto-shut mechanism (not shown), the auto-shut switch SW5 momentarily opens to turn off the relay RY2, stopping the drive system such as the motor (not shown) and completing the copying operation. Note that in this single copy state, relay RY2
Since contact 2b is open while is operating,
When the first detection switch SW1 is pressed, the relay RY1
Even if it turns on, the transistor Q1 does not turn on, and the clutch CL1 does not operate, so insertion of the next document is blocked. Furthermore, during single copying, the trailing edge of the copy paper P that is ejected when the transfer operation mechanism is turned OFF is cut by the cutter 10, but at that point, paper feeding is stopped and the transfer unit 6 is exposed to light. The heater 9 is lifted away from the body drum 2, and the heater 9 is retracted.

On the other hand, during the set time (△t) of timer T, contact t3 of timer T does not switch, and the copy ready lamp
If PL is lit and the next document is inserted during that time and the first detection switch SW1 is closed (that is, in the case of multi-copy), the transistors Q2 and Q3 are turned on by the discharge of the capacitor C2 mentioned above.
When ON, transistor Q1 operates because contact 1a is closed, and clutch CL1 and relay RY6 are activated.
ON, clutch CL1 is contact 6a of relay RY6
By closing, the operation continues together with relay RY6, and the document is fed into the machine. At this time, the trailing edge of the first document passes through the third detection switch SW3,
After the contacts of switch SW3 are switched to charge capacitor C1, when the third detection switch SW3 is switched to the relay RY5 side again due to the leading edge of the second document, relay RY5 is activated by the charge of capacitor C1. It operates, contact 5b opens, transistor Q1 turns OFF, and clutch CL1 turns OFF.
However, the operation of the first conveyance roller 12 is stopped. Furthermore, when the first document passes through the fourth detection switch SW4, in the case of the single copy described above, the transfer operation mechanism 20 is sequentially turned off by opening the contact 3a of the relay RY3. However, in the case of this multi-copy, the contact t2 is open because the above-mentioned timer T is up, so even if the contact 3b is closed as the relay RY3 is turned off, the transistor Q4 is turned on. Therefore, the relay RY4 is turned on, and the contact 4a is closed to prevent the transfer operation mechanism 20 from turning off.
As a result, it is possible to perform the same image forming operation for two originals as for one continuous original. However, in this case, the cutter 10 is operated in synchronization with the trailing edge signal of the first document, and the cutting operation for the leading edge of the second copy is prevented.

In addition, in this transfer operation mechanism 20, when an ON signal is input, a cam device or the like operates to sequentially turn on each element as described above, and an OFF signal (contacts 3a, 4) is activated.
When both a are turned OFF, a cam device etc. is operated again to turn them OFF one after another.

To summarize the above operations, in the control device of the present invention, the first document is detected by the second detection switch.
When passing SW2, the timer T is activated, and when the second document is inserted during the delay time (△t) and the first detection switch SW1 is turned on, the first conveyance roller 12 is driven to remove the document. If the second original is not inserted during (△t), the second original is inserted until the copying operation for the first original is completed. It is designed to prevent it. That is, by doing this, the maximum interval between the preceding original and the following original when performing continuous copying (multi-copying) is regulated by time (△t), and further The space between the sheets is treated as a single copy, and variations in the size of the copied sheets are kept to a minimum.

Note that this time (△t) is determined as appropriate depending on the feeding speed of the original, etc., and it also depends on the tolerance when storing the copied paper, etc., but the feeding speed of the original (V ), then Δt·V2cm is preferable. Also, it is more convenient for the user to make this (Δt) as long as possible, but to do so, the paper feeding speed of the first conveying roller 12 must be
If the feeding speed is higher than that of the other rollers, good results can be obtained because the second and subsequent documents catch up with the preceding document.

Further, the specific configuration of the copying machine or the configuration of the control circuit shown in the above embodiments can be changed as appropriate within the scope of the technical idea of the present invention, and is limited to the configuration as described above. isn't it.

<Effects> As explained above, the present invention provides means for detecting the insertion of a document and a means for detecting insertion of the document in a type of copying machine that manually feeds the document and cuts the copy paper after the fixing process is completed. means for feeding the inserted original, means for detecting that the trailing edge of the inserted original has passed at least the feeding means, and setting a slight delay time Δt in response to this detection signal; When the next original is inserted within the set time and the insertion of the original is detected by the means for detecting the insertion of the original, the means for feeding the original is operated, and when the next original is not inserted within the set time. Since the control device is equipped with a control circuit that prevents the operation of the means for feeding the document until the copying operation for the preceding document is completed, variations in the size of the copied paper may occur even if continuous copying is performed. This is an extremely useful device in practice.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a copying machine to which a control device of the present invention is applied, and FIG. 2 is a control circuit diagram thereof. 1... Copying machine, 10... Cutter, 11... Document insertion slot, 12... First conveyance roller, 14, 15,
16...2nd, 3rd, 4th conveyance roller, SW1~SW
4...1st to 4th detection switch, CL1...1st
Clutch for conveyance roller, RY1-RY6...Relay, Q1-Q4...Transistor, T...Timer, C1, C2...Capacitor.

Claims (1)

[Scope of Claims] 1. In a copying machine of the type that manually feeds the original and cuts the copy paper after the fixing process, means for detecting the insertion of the original, and a means for detecting the insertion of the original in response to the detection signal. a means for detecting that the trailing edge of the inserted document has passed through at least the feeding means, and a means for setting a slight delay time Δt in response to this detection signal; When the original is inserted and the insertion of the original is detected by the means for detecting the insertion of the original, the means for feeding the original is operated, and if the next original is not inserted within the set time, the preceding original is inserted. A control device comprising: a control circuit that prevents operation of the means for feeding the document until the copying operation for the document is completed.