JPS604176Y2 - Copy machine original scanning control device - Google Patents

Description

[Detailed description of the invention] This invention relates to an original scanning control device for a copying machine in which both the original placing table on which the original to be copied is placed and the optical system for scanning the original are movable, and the object of this invention is to The object of the present invention is to provide a document scanning control device for a copying machine that can control both the movement of the document table and the movement of the optical system with a single circuit configuration.

This invention will be described in detail below with reference to an illustrated embodiment.

In the figure, reference numeral 1 denotes a document table of a copying machine (not shown), which moves forward in the direction of arrow a and back in the direction of arrow 2 with a document 2 to be copied placed thereon.

Reference numeral 3 denotes a scanning optical system provided below the document table 1, which moves forward in the direction of arrow C and backward in the direction of arrow d. Further, the optical system 3 is configured such that the origin position is detected by an origin position detection switch 5.

The movements of the original platen 1 and the optical system 3 are selected depending on the paper size or the variable magnification of variable-magnification copying, and when only the optical system 3 moves (the selection signal at this time is A). There is a case where the optical system 3 and the document placing table 1 move simultaneously (the selection signal at this time is B), and each document placing table 1 and the optical system 3 move at the end position selected according to the paper size. The operation of the switches 6 and 7 causes a transition to the return operation.

On the other hand, FIG. 2 shows a control circuit for controlling the movement of the document table 1 and the optical system 3, in which signals A and B selected depending on the paper size or magnification ratio are used together with the scanning start signal C.
are input to AND gates 8 and 9.

For example, if signal A is selected and scanning signal C is input to AND gate 8, the output of AND gate 8 becomes rH.
This output sets the latch circuit 13 via the OR gate 10, and the output 13a of the latch circuit 13 causes only the optical system 3 to start moving, scan the original 2, and select the paper size according to the paper size. The latch circuit 13 is cleared by the signal 7a generated when the end position detection switch 7 is turned on.

At the same time, the latch circuit 14 is set via the timer 15, and the optical system 3 starts to move backward by the output 14a of the latch circuit 14. When the origin position detection switch 5 detects the return of the optical system 3, the latch circuit 14 is cleared and the return of the optical system 3 is completed.

Further, when signal B is selected and scan start signal C is input to AND gate 9, the output of AND gate 9 is
6 to latch circuits 11 and 13, respectively, and set them.

Note that the timer 16 is for correcting a time lag when the optical system 3 moves independently, and may be placed on the output side of the AND gate 8 depending on the starting characteristics, scanning speed, etc.

By setting each of the latch circuits 11 and 13, the document table 1 starts to move according to the signal 11a output from the latch circuit 11, and the optical system 3 starts to move according to the output signal 13a from the latch circuit 13, and the document 2 is scanned. At the same time, the latch circuit 11 is set by the signal 6a generated when the end position detection switches 6 and 7 selected according to the paper size are turned on, and the latch circuit 13 is set by the signal 7a.

At the same time, the latch circuit 12 is set by the signal 6a inputted via the timer 17, the document table 1 is set by the output 12a of the latch circuit 12, and the latch set by the signal 7a inputted via the timer 15 is set. circuit 14
The optical system 3 starts to move backward by the output 14a of
When the origin position detection switches 4 and 5 detect that the original positioning table 1 and the optical system 3 have returned to their original positions, the latch circuits 12 and 14 are cleared by the signals 4a and 5a, and the original positioning table 1 and the optical system 3 are returned to their original positions. is completed.

Note that in the above embodiment, the end positions of both the original platen 1 and the optical system 3 are detected by the detection switches 6 and 7, but once the detection of one is completed, there is no need to detect the end position of the other. Since both may be made to move back, a circuit configuration as shown in FIG. 3 may be used in which either one, preferably both, move back when the end position of the optical system 3 is detected. .

As detailed above, this device enables movement control of only the optical system with a single circuit configuration, as well as movement control when the optical system and document table move simultaneously, so there is no need to provide separate circuits. It is very economical.

[Brief explanation of drawings]

The drawings show one embodiment of this invention; Fig. 1 is a schematic diagram of the document mounting table, Fig. 2 is a circuit diagram of the control system, and Fig. 3 is a circuit diagram showing another embodiment of the control system. . Reference numeral 1 denotes a document placement table, 2 a document, 3 an optical system, 4 and 5 origin position detection switches, 6 and 7 end position detection switches, and 12 and 14 return movement means.

Claims (1)

[Scope of utility model registration request] In a copying machine in which both a document table 1 on which a document 2 to be copied is placed and an optical system 3 that scans the document 2 are movable in relative directions, a signal A and a scanning signal selected depending on the paper size or magnification ratio are used. A means for generating a movement start signal for the optical system 3 upon input of the start signal C, and a means for generating a return signal for the optical system 3 upon detecting that the optical system 3 has moved to a position selected in advance according to the paper size. a means for generating a movement start signal for the document mounting table 2 and the optical system 3 in conjunction with the input of the signal B and the scanning start signal C selected according to the paper size or variable magnification, and a position selected in advance according to the paper size. A document for a copying machine comprising a means for detecting that at least one of the document table 2 and the optical system 3 has moved up to the position and generating a return signal for the document table 2 and the optical system 3 in a single circuit. Scanning controller.