JPS6116051B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic document feeder, and more particularly to an automatic document feeder that can perform continuous copying by applying an overlay technique.

Conventionally, as shown in FIG. 1, an automatic document feeder of this type has a document transporting member b such as a rotating belt placed on a platen a, and the document c is moved by the frictional force between the document transporting member b and the document c. There is a known structure in which the images are sequentially sent out along a platen a.

However, if the overlay method is applied to an automatic document feeder having such a structure, the overlay mask d moves together with the document c, making continuous copying difficult.

In other words, in order to copy only a predetermined position of the document c by making it opaque except for a predetermined position, or by copying a predetermined character or
An overlay mask d for writing figures and combining the original with characters/figures for copying is provided between the platen a and the original c, and the original c and the overlay mask d are in direct contact with each other. Due to the frictional force, the overlay mask d is transferred together with the document c.

For this reason, the overlay mask d must be set on the platen a every time the original c is transferred, making continuous copying difficult even if the same overlay mask d is used.

The present invention has been made in view of the above circumstances, and its purpose is to provide a transparent sheet below the platen side of the document transporter so that only the document is transported so that the document transporter and the overlay mask do not come into direct contact with each other. The purpose of the present invention is to provide an automatic document feeder in which the overlay mask is stationary on the platen and can perform continuous copying by applying the overlay method.

Embodiments of the present invention will be described below with reference to FIGS. 2 and 3.

A platen 2 is provided at a predetermined position on the main body 1 of the copying machine, and a platen cover 3 for closing and opening an upper surface 2a of the platen 2 is provided.

The platen cover 3 has an upper wall 3a and front and rear walls 3b, 3.
b and the left and right walls 3c, 3c form a box shape having a downward opening 3d, and a driving pulley 4 and a passive pulley 5 are provided inside the box, and a belt 6 is stretched between the driving pulley 4 and the passive pulley 5. The original transport body 7 is arranged opposite to the upper surface 2a of the platen 2.

Both ends 8a, 8a of the transparent sheet 8 are tightened and fixed with screws 9 across the left and right walls 3c, 3c of the platen cover 3, and the transparent sheet 8 is located at the center of the downward opening 1d in the front-back direction (original transport direction). A document inlet 10 and a document outlet 11 are formed by covering the transparent sheet 8 and forming a gap between the front and rear edges 8a', 8a' of the transparent sheet 8 and the front and rear walls 3b, 3b of the platen cover 3.

Reference numeral 12 denotes an overlay mask, which is provided between the platen 2 and the transparent sheet 8, and is opaque except for a predetermined position.

Then, with the overlay mask 12 set on the platen 2 and the platen cover 3 closed, the belt 6 is rotated in the direction of the arrow, and the original 13 is inserted between the belt 6 and the transparent sheet 8 from the original entrance 10. Then, the original 13 is transported along the transparent sheet 8 by the frictional force with the belt 6 and is set at a predetermined position on the platen 3.

In this state, if the belt 6 is stopped and a conventionally known copying operation is performed, only a predetermined position of the original 13 can be copied.

Then, when the belt 6 is driven again, the original 13 is ejected from the original exit 11.

During the above operation, the original 13 does not come into direct contact with the overlay mask 12, so the overlay mask 12 located under the transparent sheet 8 remains stationary on the platen 2 without being affected by the action (conveying force) of the belt 6. becomes.

Therefore, the same overlay mask 12
In case of continuous copying using the , it is sufficient to insert only the originals 12 one after another, and continuous copying can be performed efficiently.

Moreover, if the overlay mask 12 is made into a transparent sheet with predetermined characters and figures written on it, the original 1
3 and characters/figures can be combined and copied.

In the embodiments described above, the belt 6 is used as the document transport body 7, but it may also be a roller.

The present invention is as described above, and the transparent sheet 8 is installed below the document transport body 7, and the document 13 is moved between the transparent sheet 8 and the document transport body 7, so that the platen cover 3 covers the upper surface of the platen 2. 2a, the overlay mask 12 placed on the top surface 2a of the platen 2 comes into contact with the transparent sheet 8, and only the original 13 is transferred without contacting the document transporter 7 or the document 13, and the overlay mask 12 is placed on the platen 2. It is stationary on 2.

Therefore, the originals 13 can be continuously transferred with the overlay mask 12 placed on the upper surface 2a of the platen 2, and the same overlay mask 1 can be transferred.
2, it becomes an automatic document feeder that can make continuous copies using the overlay method.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional example, FIG. 2 is a sectional front view showing an embodiment of the present invention, and FIG. 3 is a longitudinal sectional view thereof. 2 is a platen, 3 is a platen cover, 7 is an original conveyor, 8 is a transparent sheet, 12 is an overlay mask, and 13 is an original.

Claims (1)

[Claims] 1. Upper surface 2 of platen 2 installed in copying machine main body 1
A document transporting body 7 such as a belt or roller is provided on the platen cover 3 that closes and opens the platen 2, and the document transporting body 7 in the platen cover 3 is
A transparent sheet 8 is disposed below the side so that a document inlet 10 and a document outlet 11 are formed between the transparent sheet 8 and the document transport body 7, and the upper surface 2a of the platen 2 is closed with the platen cover 3. An automatic document feeder characterized in that the transparent sheet 8 comes into contact with an overlay mask 12 placed on the upper surface 2a of the platen 2 when the document is moved.