JPH06627B2 - Duplex copying machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a double-sided copying apparatus, and more particularly, to a catch when a recording sheet after one-sided copying is accommodated in a stacker or a sheet is re-fed from a stacker to a copying section. The present invention relates to a double-sided copying machine capable of preventing a paper tip from being bent or a conveyance failure.

[Background of the Invention]

Generally, in a double-sided copying apparatus, recording sheets copied on one side by a copying unit are accommodated in a stacker provided below the copying unit, and then re-fed from the stacker to the copying unit so that both sides can be copied. There is. When the recording paper storage and re-feeding mechanism is shared by one friction wheel capable of forward and reverse rotation, the lower end of the guide plate covering the outside of the friction wheel and the recording paper stored in the stacker are brought into pressure contact with the friction wheel. Thus, the relationship with the tip of the push-up plate whose tip moves up and down is important. That is, when the lower end a'of the guide plate a and the tip b'of the push-up plate b are close to each other as shown in FIG. 4I, the recording paper is moved when the tip of the push-up plate b moves upward during re-feeding. The tip c'of c may be broken, and the lower end a'of the guide plate a as shown in FIG.
And the tip b'of the push-up plate b are separated by a certain distance, and the lower end portion a'of the guide plate a is inclined toward the push-up plate b side,
Although the above fear can be eliminated, there is a fear that the leading edge of the recording sheet may be caught in the gap d between the guide plate and the leading edge of the push-up plate when the recording sheet is accommodated, and the record pushed up by the push-up plate as shown in FIG. There is a possibility that the leading end of the paper may hang down and come into line contact with the rotating member e, and the re-feeding may become unstable.

[Object of the Invention]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a double-sided copying apparatus that can prevent the recording paper from being caught when it is stored and from being bent or drooping at the leading edge when re-feeding.

[Structure of Invention]

In order to achieve the above-mentioned object, the present invention accommodates a recording sheet after one-sided copying in a stacker, and rotates in a forward and reverse direction so as to re-feed the sheet from the stacker to a copying section, and a guide that covers the outside of the rotating member. In the double-sided copying apparatus, the guide plate is provided with a plate and a push-up plate that moves down to the same level as the stacker when the recording paper is stored and moves up so that the recording paper is pressed against the rotating member when re-feeding. The lower end and the tip of the push-up plate are provided with projections that can be rubbed against each other.

〔Example〕

Next, the present invention will be described based on the embodiment shown in FIGS.

In FIG. 1, reference numeral 1 is a copying apparatus main body, 2 is a primary paper feeding means, and the primary paper feeding means 2 sends out recording papers 3 stored in a cassette (not shown) one by one and supplies them to a copying section 4. It is for doing. 5 is a conveyor belt for the recording paper 3 copied by the copying unit 4, 6 is a fixing unit for the recording paper 3 sent by the conveyor belt 5, and 7 is a paper discharge unit for discharging the recording paper 3 after fixing. Is. A guide roller 8 is provided on a paper discharge path 9 connecting the fixing unit 6 and the paper discharge unit 7, and the guide roller 8 is provided.
A movable guide plate 10 having a curved front end portion is provided so as to cover the sheet discharge unit 7 side. The movable guide plate 10 is pivotally supported at its base end by a frame 11 of the paper discharge unit 7 via a shaft 11.
A position (solid line) covering the guide roller 8 and a retracted position (two-dot chain line) can be selected by operating a solenoid (not shown).

Reference numeral 12 denotes a double-sided unit attached to the lower surface of the copying apparatus main body 1. The double-sided unit 12 linearly directs the recording paper 3 flowing down along the movable guide plate 10 toward the primary paper feeding means 2 side of the copying apparatus main body 1. In addition to the transport path 13 for transporting the target sheet, a secondary sheet feeding means 14 is provided in front of the transport section 13. The secondary paper feeding means 14 stores the recording paper after one-sided copying in the stacker 15 and reverses forward and backward so as to re-feed from the stacker 15 to the copying section 4 through the recording paper passage 2a of the primary paper feeding means 2. A rotary member (may be a rotary belt) 16, a guide plate 17 that covers the outside of the rotary member 16, and a recording sheet 3 stored in the stacker 15 that is pressed against the rotary member 16 during refeeding. Push-up board 1
8 and. Reference numeral 19 denotes a double feed prevention roller which is spring-biased so as to come into pressure contact with the outer surface of the rotating member 16, and 20 denotes an auxiliary roller.

The double feed prevention roller 19 is free to rotate when the recording paper 3 is fed to the stacker 15, while it is in a non-rotating state when the recording paper 3 is fed from the stacker 15, and one recording paper 3 is fed. It functions so that they can be separated one by one.

Reference numeral 21 is a drive shaft to which the base end portion of the push-up plate 18 is fixed. The drive shaft 21 holds the push-up plate 18 on the same surface as the bottom surface of the stacker 15 when the recording paper 3 is accommodated, and the drive shaft 21 moves from the stacker 15 to the copy unit 4 When the sheet is re-fed, the tip of the push-up plate 18 is rotated so as to move upward.

22 is a projection provided on the lower end 17 'of the guide plate 17, 2
Reference numeral 3 is a protrusion provided on the tip 18 ′ of the push-up plate 18.
The protrusions 22 and 23 are provided at positions where they can rub each other. For example, as shown in the second illustration, the protrusion 2 of the guide plate 17
If 2 is provided at both ends and the intermediate portion, the protrusion 23 of the push-up plate 18 may be provided at a position where the gap (concave groove) 22 ′ formed between the protrusions 22 can be slid through. Of course, the positions and the number of the protrusions are not limited as long as the protrusions 22 and 23 can be rubbed off from each other.

In the above-described embodiment, the recording paper after one-sided copying is rotated by rotating the rotating member 16 in the direction of the arrow as shown in FIG.
5, the push-up plate 18 is inserted into the stacker 1
5, which is on the same plane as the guide plate 17, and the guide plate 17 and the push-up plate 18
The protrusions 22 and 23 at the both ends of are fitted together. Therefore, no gap is formed at the tips of the guide plate 17 and the push-up plate 18, and even if the recording paper fed in is curled downward, it is not caught. Further, after a predetermined number of recording sheets 3 after one-sided copying are stored in the stacker 15, the push-up plate 18 is moved upward as shown in FIG. 11 and the uppermost layer of the recording sheet 3 on the upper surface of the rotating member 16 is moved. When pressure-bonded to the lower surface, the recording paper is
The tip is held so that it does not drip.

〔The invention's effect〕

As described above, according to the present invention, the recording member after one-sided copying is accommodated in the stacker, and is rotated in the forward and reverse directions so as to be re-fed from the stacker to the copying unit, and the guide plate covering the outside of the rotating member. A lower end of the guide plate in a double-sided copying machine having a push-up plate that moves down to the same level as the stacker when the recording paper is stored, and moves up to press the recording paper against the rotating member when re-feeding the paper. Since the protrusion and the tip of the push-up plate are provided so as to be able to rub each other, when the recording paper after one-sided copying is fed into the stacker by the forward rotation of the rotating member, the leading end of the recording paper. Even if the paper curls downwards, there is no gap between the tips of the guide plate and the push-up plate to catch the tip of the recording paper. Crimp Pressed into the recording paper between the tip of the guide plate and the push-up plate even if you have never a gap drip. Therefore, there is an excellent effect that it is possible to stably perform the feeding at the time of re-feeding.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention. FIG. 1 is an overall sectional view, FIG. 2 is a schematic perspective view of an essential part, and FIG.
FIGS. I and II are sectional views showing the operation, and FIGS. 4 to 4 are sectional views of a conventional example. 1 ... Copying device main body 2 ... Primary paper feeding means 3 ... Recording paper 4 ... Copying portion 14 ... Secondary paper feeding means 15 ... Friction wheel 16 ... Stacker 17 ... Guide plate 18 ... Push-up plate 22, 23 ... Protrusion

Claims (1)

[Claims] 1. A rotating member that stores the recording paper after one-sided copying in a stacker, and rotates in the forward and reverse directions so as to re-feed the stack of paper from the stacker to a copying unit, a guide plate that covers the outside of the rotating member, and a recording paper. In a double-sided copying machine equipped with a push-up plate that moves down to the same level as the stacker during storage and moves up to press the recording paper against the rotating member during re-feeding, the lower end of the guide plate and the A double-sided copying machine, characterized in that a protrusion capable of rubbing each other is provided on the tip of the push-up plate.