JPS5837538B2 - Document table control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a copying machine with a movable document table, and more particularly to a copying machine in which the document table is movable except when the document table is under drive control.

In this type of copying machine, by making the document table movable, maintenance and inspection of the machine, such as supplying toner to a toner supply device housed in the machine body below the document table and maintenance of other equipment, are facilitated.

However, since the document table is movable, there is a possibility that copying may be started while the document table is at a position other than the normal copying position.

SUMMARY OF THE INVENTION An object of the present invention is to provide a control device for a document table that can accurately control the drive of the document table and also facilitate timing adjustment between movement of the document table and paper feeding.

FIG. 1 is a mechanical diagram showing an embodiment of the present invention.

A document table 2 on the machine frame 1 is mounted so as to be movable in the direction of a guide rail (not shown), and a latch 3 provides a click at the normal standby position, and a wire 4, a sheave 5, and a pulley 6 rotate the pulley 6. One drive of forward and backward is performed.

The pulley 6 has a gear 7 integrally, and the gear 7 has gears 8 and 9.
are interlocked.

Gear 8 can be coupled to a sprocket 10 via an electromagnetic clutch (not shown), and gear 9 can similarly be coupled to a sprocket (not shown) via an electromagnetic clutch.

The sprocket 10 and the sprocket for the gear 9 are driven in opposite rotation directions via a chain 12 from a motor (not shown) for driving the photosensitive drum 11 and the like.

In this mechanism, by activating the electromagnetic clutch and connecting the sprocket 10 and the gear 8, the pulley 6 rotates in the direction of the arrow, and the document table 2 is moved forward and driven.

Further, by actuating the electromagnetic clutch on the gear 9 side, the pulley 6 rotates in the opposite direction to the above, and the document table 2 is driven backward.

Furthermore, by turning both electromagnetic clutches off, the document table 2 becomes movable.

Note that the forward drive of the document table 2 by the gear 8 is performed by the drum 11.
The gear ratio is changed so that the backward drive of the document table 2 by the gear 9 is faster than the forward drive.

An exposure lamp 13 is provided at a predetermined position under the document table, and the reflected light (indicated by an arrow) from the document illuminated by the exposure lamp 13 is passed through an optical system and output from a charger 14 provided on the surface of the photosensitive drum 11. As the drum 11 rotates, a latent image is formed on the peripheral surface of the drum 11, whose surface is uniformly charged.

Further, copy paper 16 is supplied around the photosensitive drum 11 via a paper feed roller 15, and toner is transferred thereto.

The paper feed roller can be driven by a chain 12 via an electromagnetic clutch, and the paper feed timing is controlled by the control of the electromagnetic clutch.

Next, the 1-drive control of the document table and the control of the paper feed roller will be explained.

First and second microswitches 20 and 21 are provided on the lower body of the document table 2 at a distance from each other along the direction of movement thereof.

On the other hand, the document table 2 has a first cam 22 that turns on the microphone port switches 20 and 21 at its standby position (click position), and a first cam 22 that turns on the first microswitch 20 when the document table 2 moves forward a predetermined distance. A second cam 23 is provided for actuation.

Here, the position of the microswitch 20 is fixed,
The distance between the microswitch 21 and the microswitch 20 can be adjusted.

Further, the cam 22 is fixed to the document table, and the cam 23 is fixed to the document table.
The structure is such that the distance between the two can be adjusted.

On the other hand, in order to detect the rotation angle of the photosensitive drum 11, a predetermined number of holes are provided evenly on the circumference of a disk 24 that rotates together with the photosensitive drum 11, and light is emitted on both sides of the hole position of the disk 24. A rotation angle sensor 2 which is provided with an element and a light receiving element and converts the rotation of the photosensitive drum 11 into a pulse output of the light receiving element.
5 is set.

The outputs of the microswitches 20 and 21, the pulse output of the angle sensor 25, and the output of the document size designation switch are input to a microcomputer 26 as a control circuit, as shown in FIG.

The microcomputer 26 allows the start of copying only when the switches 20 and 21 are both ON, and operates the copying start button switch 27 to operate and hold the document table advance clutch 28 to control the document table 2 to move forward.

Further, when the cam 23 turns on the switch 20 while the document table is moving forward, the microcomputer 26 operates the electromagnetic clutch 29 for driving the paper feed roller 15, and feeds the waiting copy paper 16 onto the surface of the drum 11.

Therefore, the distance between the cams 22 and 23 is adjusted to the distance at which the exposed surface at the position of the charger 14 reaches the paper feeding position.
Enables copy edge timing adjustment.

Further, the microcomputer 26 determines the distance traveled by the document table 2 specified by the document size designation switch 27 by counting the number of pulses of the sensor 25, turns off the electromagnetic clutch 28 for moving the document table forward, and turns off the electromagnetic clutch 28 for moving the document table backward. clutch 3
Activate 0.

Further, the microcomputer 26 turns off the backward electromagnetic clutch 30 when the cam 22 turns on the switch 21 due to the backward movement of the document table 2.

At this time, the document table 2 is separated from the drive system 1, but continues to move backward due to its inertia, and stops at the click position (standby position) by the latch 3.

Therefore, the distance between the switches 20 and 21 is adjusted to the degree of inertial energy absorption from the release of the backward drive of the document table to its stop, making it possible to adjust the shock when the document table stops.

Further, the microcomputer 26 controls the lighting of the exposure lamp 13 before starting the forward drive of the document table, and controls the exposure lamp 13 to be turned off during the backward drive and the drive.

Control by such a microcomputer is based on the state of the switches 20 and 21, the specified value of the document size, and the angle sensor 2.
Arithmetic processing using pulses from 5 as input is possible.

For example, switches 20, 21 are connected to cam 22. The ON/OFF operation is performed by the cam 23, but the ON/OFF operation is performed by the cam 22.
The difference between the F operation and the ON/OFF operation by the cam 23 can be determined depending on the position of the document table, that is, the pulse calculation value of the sensor 25.

FIG. 3 illustrates a program for obtaining the above control.

Note that the microswitches 20 and 21 and the cam 22 . Detection of the position state of the document table by 23 can be implemented by an electrical position detector including a light emitting element and a light receiving element instead of a microswitch.

Similarly, the sensor 25 may have a magnetic pole part instead of a hole in the disk 24, and the sensor may be configured with a magnetically sensitive element.

As described above, the control device according to the present invention allows the start of copying only when the document table is in the normal standby position, and changes the position of the switch 23 to command the paper feed and adjust the paper feed timing. The ability to adjust the shock when the document table stops moving backwards, etc.
By using the arithmetic processing function of the microcomputer for controlling the copying machine, the document table can be adjusted accurately with fewer switches and cams.
This has the effect of enabling drive control and facilitating paper feed timing adjustment.

[Brief explanation of drawings]

FIG. 1 is a mechanical diagram showing an embodiment of the document table control device according to the present invention, FIG. 2 is a block diagram showing an embodiment of the control unit according to the present invention, and FIG. 3 is a microcomputer 26 in FIG. 2. 2 is a flowchart illustrating a program. 2...Original table, 11...Photosensitive drum,
13... Exposure lamp, 15... Paper feed roller, 16... Copy paper, 20... First switch, 21...... First 2 switches, 22...
...First cam, 23... Second cam, 25.
... Rotation angle sensor, 26 ... Microcomputer, 27 ... Document size specification switch, 28 ... Document platen advance clutch, 29 ...
...Clutch for paper feed roller, 30...Clutch for backing up the original platen.

Claims (1)

[Scope of Claims] 1. In a moving document copying machine equipped with a document table that is driven forward at the start of copying and is driven backward to the original standby position after advancing to a predetermined position, the document an engaging means that engages a part of the document table to stop the document table at the standby position when the table is retreated to the standby position, and first and second switches provided at a distance in the direction of movement of the document table; , and turn on both the above switches in the standby position located on the document table.
Copying is allowed to start only when the first operating device to be operated and both of the above switches are both ON, and when the document table is retracted, the second operation is performed by the first operation device before the document table engages with the engaging means.
A control device for a document table, comprising: a control circuit that controls driving and stopping of the document table by turning on a switch. 2. In a moving document copying machine equipped with a document table that is driven forward at the start of copying and is driven backwards to the original standby position after advancing to a predetermined position, a first, a second switch; a first operating device provided on the manuscript table and configured to turn on both of the switches in its standby position; and a second manipulator that turns on the first switch when the document tray moves forward a predetermined distance. and both the above switches are OFF.
Copying is allowed to start only during the N operation, paper feeding control is started when the first switch is turned on by the second operating device, and paper feeding control is started when the second switch is turned on by the first operating device when the document table is retracted. What is claimed is: 1. A control device for a document table, comprising: a control circuit for controlling a connection between the document table and its drive source. 3. In a copying machine with a movable document table, which is equipped with a document table that is driven forward when copying starts and is driven backwards to the original standby position when it advances to a predetermined position, the document table is provided on the side of the copying machine body and the document table is moved back to the standby position. an engaging means that engages a part of the document table to stop the document table at the standby position when the document table is moved backward; first and second switches provided at a distance in the direction of movement of the document table; Both switches are turned OFF in their standby position.
The first operating device for N operation and the above-mentioned first operating device allow the start of copying only when both of the above switches are ON, and when the document table is retracted, the first operation device operates the first operation device before the document table engages with the engaging means. A control circuit for a document table characterized by comprising a control circuit that disconnects the document table from its first drive source and controls the document table to be in a free movement state and retreated to a standby position by turning on two switches. Device.