JPH0536789B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a method for controlling a copying machine that controls the document scanning length by the scanning time. The present invention relates to a method for controlling a copying machine in which a time interval is provided between the scanning of a plurality of original documents when copying onto copy paper so that the edges of the plurality of copy papers do not come into contact with each other at a registration roll section.

(Background Art) In order to improve copying speed, a copying machine has been proposed that copies a plurality of originals placed on a platen onto a plurality of copy sheets corresponding to the number of originals.

For example, this copying machine can print on an A3 size platen.
By arranging two A4-sized originals closely together, one copy operation can produce two copies, each corresponding to the two originals placed on the platen at the same time, reducing the number of times the originals must be set. Therefore, the total copying speed can be increased.

However, in conventional copying machines such as those described above, the electrostatic latent images of multiple originals formed on the photosensitive drum are formed continuously without any intervals, so they are fed from the paper feed section. A plurality of copy sheets must be fed to the transfer section in a continuous manner without any gaps. Therefore, the trailing edge of the first sheet of copy paper waiting in the registration roll section and the leading edge of the following copy sheet overlap and come into contact with each other. Even in such a state, a complicated gate mechanism must be provided in the registration roll section in order to accurately supply a plurality of copy sheets to the transfer section at a predetermined registration timing.

As a means of solving this problem, as shown in Japanese Patent Application Laid-Open No. 52-73042, a setting member 91 disposed near the platen so as to be movable in the scanning direction of the documents is used to set the center of the two documents. That is, the micro switch 137 indicates the end point of scanning for the first document and the start point of scanning for the second document, the micro switch 138 indicates the end point of the movement of the scanning system for the first document, and two A macro switch 136 is provided to indicate the starting point of the movement of the scanning system for the second original, and a macro switch 136 is provided on the mounting plate 99 that moves in conjunction with the setting member 91 in a predetermined relationship. It is shown that a microswitch 139 is provided to indicate the end point of travel. With such means, it is necessary to provide the above-mentioned mechanism, and when using this mechanism, the operator must move the setting member 91 and the mounting plate 99 according to the size of the document. However, the mechanism was complicated and operation was troublesome.

(Objects and Structure of the Invention) The present invention has been made in view of the above, and is capable of handling a plurality of originals placed on a platen without providing a complicated gate mechanism in the registration roll section. A predetermined time interval can be set between each scan of the optical system for multiple originals without using a complicated mechanical mechanism, and the scanning system can copy the paper size before and after the interval while making copies on copy paper. The present invention provides a method for controlling a copying machine that performs scanning over a predetermined distance according to a given distance.

The method for controlling a copying machine according to the present invention will be explained in detail below.

(Example) FIG. 1 shows an example of the present invention, for example,
A platen 2 on which two A4-sized originals 1a and 1b can be arranged in parallel, a start key 3, a copy number display section 4, a paper size key 51 for specifying the paper size, and a paper size key 51 for specifying the paper size. A console (operation panel) 6 having a sheet number command key 5 and the like for instructing copying is provided at the top of the copying machine 7. Inside the copying machine 7, there is a scanning system 8 (light source lamp 8a, mirrors 8b, 8c, lens 8d) that scans the original 1, a photosensitive drum 9 that is exposed by the scanning system 8, and a copy paper in the transfer section 9a. A paper feed tray 10 (having a paper feed roll 10a) is provided for supplying paper. An exposure slit 11 is provided around the photosensitive drum 9;
A developing section 12 that develops the latent image based on the potential of the latent image, a transfer corotron 13 provided in the transfer section 9a, and a cleaner 14 that removes the toner after transfer from the photosensitive drum 9 are provided. A transport belt 15 and a fixing section 16 are provided after the transfer section 9a, and a registration roll 20 is provided before the transfer section 9a. On the other hand, the operation of the copying machine 7 is controlled by a control section 17 (for example, a microcomputer). The control unit 17 is an input interface 17 that inputs sensor signals from various sensors in the copying machine 4 or operation command signals from a console (operation panel).
a, a ROM 17b that stores programs necessary for calculation processing of input signals, a CPU 17c that performs predetermined calculations based on the programs, a RAM 17d that temporarily stores calculation results, data, etc., and a ROM 17b that stores programs necessary for calculation processing of input signals; It has an output interface 17e that outputs control signals to various control objects of the machine 7 or to the display section of the console (operation panel) 6. A paper feed unit drive circuit 19 that controls the driving of the registration roll 20 and the paper feed roll 10a, and a scanning system drive circuit 18 that controls the operation of the scanning system 8 are connected to the output interface 17e.

In the above configuration, the operation of the scanning system 8 will be explained with reference to FIG. 1 and FIG. paper size key 51 of board) 6 and paper number command key 5 of "A4 x 2"
is turned on, the display on the copy number display section 4 is set to "1" by the copy number command key indicated by the numeric keypad, and the start key 3 is turned on to issue a copy start command signal, the scanning system drive circuit of the control section 17 is activated. 18, the scanning system 8 starts moving, the speed of the scanning system becomes Vp, and scanning of the original starts from the time when the leading edge of the original is reached. To explain the operation with reference to FIG. 2, the scanning system 8 reaches a constant speed Vp at time t1 and starts scanning the first document 1a, and when it reaches time t2, scans the width of the document 1a. When finished, the scanning system 8 starts decelerating and stops at time t3, and then increases the maximum speed V _R 1 in the opposite direction to the scanning direction.
The scanning optical system is driven and braked for a certain period of time so that The speed of the scanning system at is
It is set to become Vp. Incidentally, the scanning distance of the first original 1a is expressed by the area S2, and the moving distance of the scanning system is expressed by S1+S2+S3).

The scanning system 8 starts moving in the scanning direction from time t4, and starts scanning from one end of the second original 1b at time t5 when the speed reaches Vp, thereby scanning the second original 1b. At time t6, the other end of the original 1b is reached and the scanning is completed. Therefore, with the above operation, the original is imaged on the photosensitive drum 9 by the sum of the braking distance S3 of the first scan, the distance S4 returned in the opposite direction to the scanning direction, and the rising distance S5 of the second scan. 1
A certain distance is formed between the electrostatic latent image of document 1b and document 1b (the distance is determined by time (t5-t2) and the speed of photosensitive drum 9, which is rotating continuously during this period). . The control unit 17 determines this interval time (t5
-t2) to the paper feed unit drive circuit 19, the paper feed unit drive circuit 19
0a and the registration roll 20 to feed the copy paper to the transfer section 9a in accordance with the interval.
A copying operation is performed by feeding a copy sheet to the transfer section 9a (the subsequent copying operation is self-explanatory and will not be described). Scanning system 8 is A4 size 2
When the scanning of the sheets of originals 1a and 1b is completed at time t6, the scanning system 8 is braked and decelerated, travels a braking distance S7, stops at time t7, and then starts moving backwards and returns home at the maximum speed V _R 2. Return to position. Area S8
represents the return distance, and the following relationship holds between S1 to S8 (in the case of an A4 size document).

S2=S6=210mm (Length of short side of A4 size original) x
Vp S3+S5=S4 S1+S2+S6+S7=S8=420×Vp+2α Here, the rising distances S1 and S5 traveled from when the scanning system starts until it reaches the speed Vp are equal, and the scanning system stops after being braked. The braking distances S3 and S7 traveled up to this point are equal. and,
α is set to be equal to S1 and S7.

In the above embodiment, the scanning system 8 started braking at the time t2 after finishing scanning the first document, stopped at time t3, and then moved in the opposite direction to the scanning direction.
As shown in Figure B, the scanning system 8 is moved in the scanning direction at the time.
After moving at a predetermined speed Vp for a certain period of time from t2, braking is applied to overfeed by a distance corresponding to a predetermined area S3' until time t3', and then a distance corresponding to S3'+S5
It is also possible to move backward for a predetermined time so as to return by S4′.
By doing this, it is possible to freely set the scanning interval t5'-t2 between the first document and the second document.

In the above embodiment, it goes without saying that the settings for each time t2 and t6 can be automatically set by pressing down the paper size key 51 and the paper number command key 5.

(Effects of the Invention) As explained above, since the copying machine control method according to the present invention manages the document scanning process based on time, a mechanical mechanism for setting the document size as in the prior art is not required. It is possible to provide a simple scanning control method using the control mechanism of a conventional copying machine.

Specifically, since the scanning length of the scanning system can be automatically controlled according to a wide variety of paper sizes, operations become easier and the number of operations is reduced. Also, the mechanism can be simplified compared to the prior art. In addition, scanning control for braking, reversing, and starting between the end of the first document and the start of the second document is controlled at time intervals, making it flexible for various scanning speeds. It is possible to respond to such requests and to minimize the time interval required.

The scanning speed of the second document is started stably by time control.

A complicated mechanism is not required for the registration roll section.

It is possible to achieve remarkable effects such as:

Furthermore, compared to conventional control mechanisms, it has more flexibility in control than a position detection control device that requires a mechanical position detection mechanism, and has a less complicated configuration.
In addition to simplifying the manufacturing process, it is possible to provide an easy-to-operate control method that does not particularly require the operation of specifying the dividing position of the first document and the second document in the scanning system.

With the above configuration and effects, continuous copying of a wide variety of paper sizes and magnifications can be performed by operating the paper size switch and paper number command switch on the operation panel, and the efficiency of copying operations can be improved.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the structure of the present invention. Figures 2A and 2B are explanatory diagrams showing the operation of the present invention. Explanation of symbols, 1, 1a, 1b...manuscript, 2...
Platen, 5...Paper number command key, 6...Console (operation panel), 7...Copy machine, 8...Scanning system,
9... Photosensitive drum, 17... Control section, 18... Scanning system drive circuit, 19... Paper feed section drive circuit, 20...
...Registration roll, 51...Paper size key.

Claims (1)

[Scope of Claims] 1. A control method for a copying machine that controls copying operations by inputting operation command signals from an operation panel and sensor signals from various sensors, which comprises: 1 manuscript
In a copying machine control method that issues a command to copy onto two separate sheets of copy paper in response to a copy start command, (a) after applying a paper number command key signal and a paper size key signal, In response to the copy start command signal, the scanning system starts scanning the first document corresponding to the paper size command signal, waits for the time required to scan the width of the document, and then scans the first document. After completing the scanning and stopping the scanning system by applying a brake, the scanning system returns to the reverse direction for a certain period of time, and then resumes moving in the forward direction to scan the second document corresponding to the paper size command signal. A document scanning step in which the scanning of the second document is started, the scanning of the second document is finished after the time required to scan the width of the document has elapsed, and the scanning system is braked. (b) Electrostatic latent images of the two documents are formed on the photoreceptor rotating at a constant speed through the document scanning process, developed into a powder image, and aligned with the powder image at the transfer section. The process of transporting paper. (c) A method for controlling a copying machine, characterized by including each of the above steps.