JPH0443253B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for positioning and placing an original on a platen glass of a copying machine.

Conventionally, in a copying machine that irradiates and exposes an original placed on the platen glass by reciprocating the scanning optical system along the platen glass, the scan starting reference position of the scanning optical system and the position of the original are It must be in the same position as the document alignment guide for alignment.

For example, as shown in FIG. 1, a platen glass 2 is provided in a copying machine main body 1, and a mirror 4 (or lens) of a scanning optical system 3 is movable back and forth along the platen glass 2, and an original image is transferred to a photoreceptor 5. In a copying machine, the image is exposed to light, transferred as a toner image onto paper 8 fed by a paper feeder 7, and discharged to a catch tray 9 provided on the right side of the copying machine main body 1 with the copy side facing upward. A document alignment guide 10 is provided on the right side of the platen glass 2, and the document is placed and set in alignment with the document alignment guide 10, and the scanning start reference position of the scanning optical system 3 (that is, the mirror 4) is set to the document alignment guide 10. The settings match.

With this copying machine, it is necessary to set the original by aligning it with the original alignment guide 10 provided on the right side of the platen glass, which requires more operational effort than setting the original with the original alignment guide provided on the left side. It has the disadvantage of being difficult to use.

In FIG. 1, 11 is a lens with a mirror, and 12 is a fixed mirror.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to set the document set position on the platen glass by an operator and the scanning start reference position of the scanning optical system with respect to the moving direction of the scanning optical system. It is an object of the present invention to provide a document positioning device for a copying machine that can be set in opposite positions.

Embodiments of the present invention will be described below with reference to FIG. 2 and subsequent figures. Note that members that are the same as those in the prior art have the same reference numerals.

On the right side of the platen glass 2 (that is, the position facing the scanning start reference position A of the scanning optical system 3),
A document stopper 13 is provided, and a platen glass 2
On the left side (that is, the position opposite to the scanning start reference position A) is a document alignment guide 14 for setting the document on the platen glass 2 in the correct orientation.
In addition, a belt 16 serving as a document feeding mechanism is wound around a drive shaft 17 and an idler shaft 18 within the platen cover 15. The drive shaft 17 is driven by a drive motor (not shown), and the belt 16 has a coefficient of friction sufficient to convey the original A along the platen glass 2, but after the original A comes into contact with the original stopper 13 and is stopped, the friction coefficient is sufficient to cause slippage between the original A and the original A. The driving distance of the belt 16 (driving time of the drive motor) may be set to a value that allows the minimum size document (for example, B5 size) to be conveyed to the document stopper 13.

Then, the operator sets the original A on the platen glass 2 in alignment with the original alignment guide 14, closes the platen cover 15, and presses the belt 16 against the original A.

By pressing a copy start button (not shown) provided on the copying machine main body 1, a drive motor (not shown) is driven for a predetermined period of time, and the drive shaft 17 is rotated to rotate the belt 1.
6 is moved a certain distance in the direction of the arrow, the document A is transported along the platen glass 2, and comes into contact with the document stopper 13 and is stopped. After this, the belt 16 moves slightly while sliding on the document A, and then the drive motor stops and the belt 16 also stops.

As a result, the original A is positioned and set at the scanning start reference position of the scanning optical system 3. By moving the scanning optical system 3, the original image is copied onto the paper 8 and placed on the right side of the copying machine main body 1. The copy side can be ejected onto the catch tray 9 with the copy side facing up.

As described above, in a copying machine in which the catch tray 9 and the scanning start reference position are on the right side of the copying machine main body 1, the original A can be set on the left side of the platen glass 2, making the operation easier.

In addition, as shown in FIGS. 3 and 4, a sensor light source 19 is provided at the lower right side of the platen glass 2.
is movably provided at a scanning start reference position and a position further away from the platen glass 2, and the platen cover 1
5 is provided with an original sensor 20 facing the scanning start reference position, and when the original A is fed as described above and comes into contact with the original stopper 13, the original sensor 20 detects the original A, and the detection signal is used to detect the original A. Alternatively, the belt 16 may be stopped by stopping the drive motor.

With this configuration, the slip time between the belt 16 and the document A can be shortened, and the copying speed can be increased.

That is, the sensor light source 19 is provided on a lever 22 that can swing freely on a pivot 21, and the lever 22 is connected to a movable rod 23a of a solenoid 23.
In addition, the sensor light source 19 is oscillated by the spring 24 so as to be at a position further away from the platen glass 2, and when the solenoid 23 is excited, the sensor light source 19 is swung to the scanning start reference position. It is configured so that

When the copy start button is pressed, the solenoid 23 is energized and the sensor light source 19 moves to the scanning start position. When the document A comes into contact with the document stopper 13, the light from the sensor light source 19 is blocked by the document A, and the document sensor 20 stops sensing light, it starts detecting the document A, and the detection signal stops the drive motor, demagnetizes the solenoid 23, and connects the sensor light source 19 to the platen glass 2.
It is located further away than the original A so that it does not interfere with the scanning of the original A.

In addition, in FIGS. 3 and 4, the document stopper 1
3 is omitted, and the sensor light source 19 and document sensor 2 are
0 and the leading edge of the document A is detected, the drive motor may be immediately stopped, the belt 16 may be stopped, and the document A may be positioned at the scanning start reference position and set to stop.

As described above, the present invention allows the operator to set the document at a position on the platen glass 2 opposite to the scanning start reference position of the scanning optical system 3.

Therefore, even in a copying machine where the paper is ejected to the right side of the copying machine main body with the copy side facing upward, and the scanning start reference position is on the right side of the platen glass,
The original can be set on the left side of the platen glass, making the original setting operation easier.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a conventional example, FIG. 2 is an explanatory diagram showing a first embodiment of the present invention, FIG. 3 is an explanatory diagram of main parts of the second embodiment, and FIG. 4 is a bottom view thereof. 1 is the main body of the copying machine, 2 is the platen glass, 14 is the document alignment guide, 15 is the platen cover, and A is the document.

Claims (1)

[Claims] 1. In a copying machine that performs a copying operation by moving the scanning optical system 3 from a scanning start reference position on one end side of the platen glass 2, an original alignment guide for setting the original A in the correct posture on the other end side of the platen glass 2. 14, and the platen cover 15 holds the document A.
A document positioning device for a copying machine, characterized in that a document feed mechanism for feeding the document A toward one end side is provided, and a means for stopping the feed of the document A when the document A is sent to a scanning start reference position is provided. .