JPS63288857A - Method for feeding document in automatic document feeding device - Google Patents

Abstract

PURPOSE:To surely carry out a paper discharging action after a copying action without any trouble even with a thick document or a thin document by temporarily feeding a document reversely after the end of an exposure action, removing and displacing a document stopping claw from a document conveying passage and, then, discharging the document. CONSTITUTION:When an exposure action is over, a conveying belt 3 is slightly reversed to feed a document 4 temporarily backward, thereby, retracting the end of the document 4 from the end 5a of a document stopping claw 5. By electrifying a solenoid 8, the document stopping claw 5 is loweringly rotated and removed out of a document conveying passage. At the time of this removing action, since there is no document 4 on the end 5a part, the removing action of the document stopping claw 5 will not be hindered even with a thick document 4, while the document stopping claw 5 will not draw in the end of a document 4 even with a thin document 4. Hence, the paper discharging action of the document 4 after the exposure action can be surely carried out without any trouble.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a document feeding method in an automatic document feeding device of a copying machine.

PRIOR ART Conventionally, in order to increase the efficiency of copying operations, copying machines have been equipped with an automatic document feeder g! on the copying machine body. 1 (ADF). Such an ADF is generally arranged on a contact glass l, as shown in FIG.
A document 4 is automatically conveyed and set on the contact glass 1 by a conveyor belt 3 driven by a drive roller 2 or the like.

Here, in such an ADF, in order to accurately determine the stopping position of the original 4, correct the skew of the original 4, and improve the copy quality, the original 4 is placed on the downstream side in the traveling direction of the original 4 with respect to the contact glass 1. A document stopping claw 5 is provided at a predetermined position.

The document stopping claw 5 is rotatably displaceable around a fulcrum (shaft) 6, and is connected to a solenoid 8 via a lever 7 connected to the fulcrum 6. Normally, due to the biasing force of a tension spring 8 that is locked to the lever 7, the document stopping claw 5 is conveyed with its tip 5a protruding slightly above the surface of the contact glass 1, as shown by the solid line in FIG. belt 3
is in contact with. In this way, the conveyor belt 3
The tip end 5a of the document stop claw 5 that is in contact with the document stops the document 4 conveyed by the conveyor belt 3 to the document exposure reference position P.

In order to reliably stop the tip at a certain angle, it has a sharp edge as shown in the figure, and the tip surface is inclined at a slightly smaller angle than a right angle. In this state, the original 4 is transported by the transport belt 3. In this case, the conveyor belt 3 has the document 4 at the document exposure reference position P. The conveyor is driven to a target position slightly exceeding the target position and stops. By abutting the leading edge of the document 4, which is being conveyed in a slightly over-conveyed manner, against the document stop claw 5, the document 4 is reliably brought to the document exposure reference position P while correcting the skewed state. Stop at.

Then, it is subjected to exposure for copying.

After copying is completed, the lever 7 is sucked by the solenoid 8, and the document stopping claw 5 is rotated downward to a position where it does not interfere with the advance of the document 4, as shown by the imaginary line in FIG.

In this way, by releasing the document stopping claw 5 from the document conveyance path and driving the conveyance belt 3 again, the document 4 on the contact glass 1 is ejected and conveyed.

However, when such document conveyance processing is used, the following troubles may occur. For example, in the case of a thick document 4, since it is hard, when the document is ejected after the document stop-exposure operation, the tip 5a of the document stop claw 5 that stopped the document tip interferes with the hard document 4, and the release rotation occurs. Movement will be hindered. In particular, since the tip 5a of the document stopping claw 5 has an inclined shape, such a phenomenon is likely to occur. If the document stopping claw 5 is not released in this manner, the document cannot be ejected. On the other hand, in the case of a thin document 4, the release rotation operation of the document stop claw 5 during the paper ejection operation can be performed without being hindered.
may also be displaced downward, causing the leading end of the document 4 to enter the gap between the document stopping claw 5 and the contact glass 1.

In such a case, the document cannot be ejected, resulting in a paper ejection jam, and in some cases, the document 4 may be damaged.

Purpose The present invention has been made in view of the above-mentioned problems.The present invention uses a document stopping claw for document registration and skew correction, and is capable of copying whether the document is thick or thin. It is an object of the present invention to provide a document feeding method in an automatic document feeder that can reliably perform a paper ejecting operation after operation without any trouble.

Structure In order to achieve the above object, the present invention provides a document feeding method for an automatic document feeder in which a document conveyed by a conveyor belt is stopped at a document exposure reference position on a contact glass by a document stop claw. While in contact with the conveyor belt, the document is conveyed by forward rotation of the conveyor belt, and the leading edge of the document abuts the document stop claw and stopped. After the exposure operation is completed, the document is driven reversely to reverse the document. After the document is fed and the document stop claw is released and displaced from the document conveyance path, the conveyor belt is driven to rotate in the normal direction to eject the document.

An embodiment of the present invention will be described below with reference to FIG.

The structure is the same as that shown in FIG. 2, and the same parts are indicated by the same reference numerals. Note that in this embodiment, the drive roller 2
is capable of forward and reverse rotation, and the direction in which the original 4 is ejected is the forward rotation driving direction.

First, as shown in FIG. 1(a), the solenoid 8 is made inactive, and the document stopping claw 5 is
The leading edge 5a is the document exposure reference position P.

It is brought into contact with the conveyor belt 3 at . That is, it is in a state of protruding upward from one surface of the contact glass. In this state, the conveyor belt 3 is driven in the forward rotation direction indicated by the arrow to convey the document 4 onto the contact glass 1. In this case as well, the conveyor belt 3 has the document 4 at the document exposure reference position P.

The target is driven to a position slightly beyond the target position and then stopped. As a result, the original 4 is conveyed over the contact glass 1,
By hitting the tip 5a of the document stopping claw 5,
The document is positioned at the exposure reference position P6 and stopped while being prevented from being skewed. The original set in this state is subjected to exposure.

After the exposure operation is completed, as shown in FIG. 1(b),
By slightly driving the conveyor belt 3 in reverse, the original 4
Send it back once. As a result, the leading edge of the original document 4 is in a state of retreating from the leading edge 5a of the original stopping claw 5.

After the document 4 is once retreated in this manner, as shown in FIG. 1(c), the solenoid 8 is energized to rotate the document stopping claw 5 downward and release it from the document transport path. During this release operation, since there is no document 4 at the leading end 5a, the document stopping claw 5 rotates without any trouble. In other words, even in the case of a thick original, the releasing operation of the original stopping claw 5 is not obstructed by the original. Moreover, even in the case of a thin document, the document stopping claw 5 does not involve the leading edge of the document during the release operation.

In this manner, the document stopping claw 5 is released from the conveyance path, and with the conveyance path open, the document 4 is brought into contact by driving the conveyance belt 3 forward as shown in FIG. 1(d). Paper is ejected from above glass 1.

Effects In the present invention, as described above, after the document is stopped and exposed by the document stop pawl, the document is once reversely fed by the conveyor belt, and the document is moved backward, and then the document stop pawl is released, and then the document is stopped by the conveyor belt. Since the document is ejected, there is no interference with the document when the document stop claw is released in order to eject the document, and the release operation is not hindered even if the document is thick. Even if the original is thin, it will not be caught in the release operation, and troubles such as original jamming and damage to the original can be prevented.

[Brief explanation of drawings]

FIGS. 1(a) to 1(d) are side views showing an embodiment of the present invention in order of operation, and FIG. 2 is a side view showing a conventional example. 1... Contact glass, 3... Conveyor belt, 4...
...Original, 5...Document stop claw, P, ...Original exposure reference position Applicant Ricoh Co., Ltd. --□
7 Deputy Director Akira Aiki5
．． :5. “7! Riji・, 53J Diagram – Original Z Diagram

Claims (1)

[Claims] In a document feeding method of an automatic document feeder in which a document conveyed by a conveyor belt is stopped at a document exposure reference position on a contact glass by a document stop claw, the conveyor belt is stopped while the document stop claw is in contact with the conveyor belt. The document is conveyed by forward rotation drive, and the leading edge of the document hits the document stop pawl and is stopped. After the exposure operation is completed, the conveyor belt is driven in reverse to once reverse the document, and the document stop pawl is removed from the document conveyance path. A method for feeding a document in an automatic document feeder, characterized in that after the conveyance belt is released and displaced, the conveyor belt is driven in normal rotation to eject the document.