JPS59177240A - Automatic document feeding apparatus - Google Patents

Abstract

PURPOSE:To prevent contamination in copying by installing a broad belt which has a white light exposure surface which can be shielded when a document is not supplied, onto the light exposure surface of a belt for discharging the document supplied into the light exposure part by a document feeding belt, when light exposure is completed. CONSTITUTION:A broad belt 32 which has each width and length which is snough for covering the surface of a document is taken-up onto a hollow shaft 31 which is rotatably supported by bearing and feeds-out the pilted documents loaded in a document supply part 11 from the lowermost document onto the document loading board in a light-exposure part 23 by a document feeding belt 17 and pressing rollers 18 and 19 by the aid of the operation of an automatic document feeding apparatus 1. Wires 33a and 33b are connected onto the both sides at the edge part 32a of the belt 32, and the other edges are taken-up onto the pulleys 36a and 36b on a rotary shaft 37, crossing the light exposure part 23. Said broad belt 32 is formed by applying white rubber onto a cloth through vulcanization. On the other hand, when the apparatus 1 is used manually, the light exposure part 23 is closed by the operation of a handle 38, and the belt 17 is shielded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic document feeder which is used in a copying machine such as an electrophotographic copying machine and which prevents copying from being smeared by a document feed belt even when copying is performed manually.

BACKGROUND OF THE INVENTION When a large number of originals are to be copied in succession, by attaching an automatic document feeder to a copying machine, the copying operation can be performed quickly, efficiently, and unattended.

However, when multiple copies of the same original are required, when the original is deformed, special originals, thin originals, or thick originals, or when the original gets caught on the original platen, the automatic original feed is used to handle the problem. Since it is necessary to temporarily remove the device from the document placement table, the automatic document feeder 1 is releasably attached to the copying machine 2 with hinges 3a and 3b, as shown in FIG. It is configured so that it can be manually crimped onto or released from the mounting base 4.

In general, the function of the automatic document feeder 10 is as shown in FIG. Thereafter, when the copy start button of the copying machine 2 is operated, the paper feed rollers 13 and 14 and the paper feed belt 15 rotate in the direction of the arrow, and the strike to prevent multilayer feeding and the collision with the propeller 16 occur. By working together, one sheet of the original 12 is sent out to the right on the diagram.

The sent out original 12 is moved onto the original placing table 4 by the original feeding belt 17, which has started rotating in the direction of the arrow in response to the copy start operation, and by the presser rollers 18 and 19, which rotate according to the movement of the original feeding belt 17. The document 12 is then conveyed as the document feeding belt 17 rotates to a position where the leading edge of the document 12 hits.

When the conveyance is completed and the original 12 is located in the exposure area, the copying machine 2
starts exposure, and when the exposure ends, the stopper moves diagonally downward to the left, and immediately after that, the document feeding belt 17 starts rotating, and the paper ejection roller 21 rotates following this movement. After copying, the original 12 is transferred to the original output tray 22! ): The paper is ejected to.

When the automatic document feeder 1 configured in this manner is manually operated as described above, all the above-mentioned functions are stopped, and the document is pressed sheet by sheet onto the document mounting table 4 by the document feeding belt 17. Then, it is held and exposed to light.

However, due to its function, the document feeding belt 17 has
It is divided into several narrow white belts, so when using a thin original, the outline of the narrow belt may be transferred in a line overlapping the image. Furthermore, even if the document is not thin, if the document size is small compared to the transfer paper size, the outline of the narrow belt will be copied in the margin portion.

In addition, the top surface of the document table 4 is covered with a lot of graphite due to the movement of lead-written documents, which causes the document feeding belt to become black and easily stained. The copying becomes even more noticeable and unsightly, and the quality of the recording paper is greatly degraded.

OBJECTS OF THE INVENTION The present invention provides an automatic document feeder that can obtain high-quality copies without unnecessary images being transferred by the document feed belt even when copies are made manually. The purpose is to

It is constructed by placing a wide white belt that can be opened and closed at the front overlapping the front side of the document feeding belt. In an automatic document feeder that ejects a document after completion of exposure, a wide belt with a white exposed surface is provided separately for the exposed portion of the document feed belt, which is shielded when the document is not being fed. This is achieved by an automatic document feeder featuring:

Example An embodiment according to the present invention is shown in FIGS. 3 and 4 (&).

Shown in (b).

FIG. 3 shows a device according to the present invention added to the automatic document feeder 1 having the function shown in FIG. A wide belt 32 having sufficient width and length is wound around it, and wires 33m and 33b connected to both sides of the end 32m cross the exposure section n via pulleys A and 35 and reach the other end of the device 1. It is wound around pulleys 36m and 36b of a rotary shaft 37 that is rotatably provided.

The hollow shaft 31 is fitted into the fixed shaft 39 and has one end fixed to the device 1, and a torsion spring 40 whose other end is engaged with the hole 31m above the hollow shaft 315 and stored energy. It is biased counterclockwise. Furthermore, the rotating shaft 3
7 is attached with a handle blade, and is provided with a reversal prevention device (not shown) which can be released at any time to prevent rotation in the opposite direction of the arrow by the torsion spring 40.゛The automatic document feeder 1 shown in FIG.
2 is wound around the hollow shaft 31, the exposure section n of the device 1 is opened, and the document is automatically fed, and the document is shown in the direction of arrow A.
As shown in FIG. 4(a), the document feeding belt 17 is positioned facing the exposure unit, and the operations and functions in this state are as described above.

On the other hand, when using the device 1 by switching to manual operation, the handle blade is rotated in the direction of the arrow to pull out the wide belt 32 against the torsion spring 40.
), the exposure section n of the apparatus 1 is closed and the document feeding belt 1f is shielded.

The wide belt 32 is made of cloth made of vulcanized white rubber, or made of white rubber cloth, vinyl cloth, etc., so that it can perform the same function as a platen cover in a general copying machine. Moreover, since the document feeding belt 17 can be completely shielded, it is possible to prevent unnecessary images from being duplicated or being transferred to the margin area.

Note that when returning the document from manual operation to automatic feeding, the above-mentioned reverse rotation prevention device (not shown) provided on the handle 38 is used.
When the wide belt 32 is released, the wide belt 32 is automatically wound around the hollow shaft 31 by the action of the stored torsion spring 40 and returns to its original state, and the exposure section A is opened again to perform automatic document feeding. It becomes possible to perform the functions of the device 10.

Effects of the Invention As is clear from the above explanation, the present invention eliminates the disadvantages of duplication of unnecessary images caused by the document feeding belt or transfer of unnecessary images to the margins, even in manual copying, and achieves high-quality copying. It has been achieved to provide an automatic document feeder capable of producing high quality copies.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of a copying machine equipped with an automatic document feeder. FIG. 2 is a sectional view showing an example of the structure of an automatic document feeder. FIG. 3 is a sectional view showing one embodiment of the automatic document feeder according to the present invention. Figure 4(a). (b) is a plan view of the main part in FIG. 3, showing two aspects. 31...Hollow shaft 32...Wide belt 33
IL, boo wire 34.35--pulley 36
a, 36b...Pulley 37...Between rotating shafts...
Handle 39...Fixed shaft 40...Torsion spring 41...Hin 17...Document feeding bell) 2
3...Exposure Department Agent Yoshimi Kuwahara

Claims (1)

[Claims] In an automatic document feeder that feeds a document from a document replenishing section to an exposure section using a document feed belt and discharges the document after exposure is completed, exposure that can be shielded from the exposure section of the document feed belt when the document is not being fed is provided. An automatic document feeder characterized by separately providing a wide belt with a white surface.