JPS6212569A - Both side copying device - Google Patents

Abstract

PURPOSE:To correct curling due to heat at the time of fixing and increase the capacity of passing through a conveying passage by providing a roller which can form a sheet of record paper into a wave shape, in a conveying passage through which said sheet of record paper one side of which has been subjected to copying, is invertedly conveyed. CONSTITUTION:A sheet of record paper 3 one side of which was subjected to copying, is fixed by a fixing part 6, made flow down along a movable guide board 10, held in between a flat roller 61 on the upper course part of a conveying passage 13 and a pressure contact roller 64 on the circumferential surface of which annular projections 64a are arranged at a certain interval and, passing through the conveying passage 13, is housed into a stacker 26 by means of the rotation of the friction wheel 19 of a second paper feeding means 17. In this case, the sheet of paper 3 is formed into a wave shape to be made stiff while being held between the rollers 61, 64, thereby, improving a sending capacity through the conveying passage 13. A paper-feeding capacity at the time of refeeding and a separating capacity by means of the friction wheel 19 at the time of recopying, can also be improved.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a double-sided copying device, and particularly to a double-sided copying device that can correct curling that occurs in recording paper after copying on one side during transportation. be.

[Background of the invention]

In general, in a double-sided copying machine, a recording sheet that has been copied on one side in the copying section is fixed, then reversed, and sent to the lower part of the copying section, which is then further reversed and stored in a stacker, and then further reversed from the stacker to the copying section and reproduced. It allows you to feed paper and make copies on both sides.

However, the recording paper that has been copied on one side curls due to the heat during copying and fusing, so it cannot pass through the conveyance path smoothly, and there is a risk of it jamming along the way, as well as having to be re-fed from the stacker. There have been various problems, such as sometimes paper curling and poor separation performance from the photoreceptor drum when recopying the other side in the copying section.

[Purpose of the invention]

In view of the above points, this invention forms the recording paper after copying on one side into a wave shape during conveyance to improve the passing performance in the conveyance path, the paper feeding performance when refeeding the paper, and the separation performance when recopying. The object of the present invention is to provide a double-sided copying device that has the following features.

[Structure of the invention]

In order to achieve the above object, the present invention provides a conveying path for reversing and conveying recording paper after single-sided copying.

In a double-sided copying device equipped with a stacker for storing the recording paper inverted and a secondary paper feeding means for feeding the stacker recording paper, a roller capable of forming the recording paper in a wave shape is provided in the conveyance path. It is composed of

〔Example〕

Next, the present invention will be described based on embodiments shown in the accompanying drawings.

In the figure, 1 is the main body of the copying machine, 2 is the primary paper feeding means,
The second paper feeding means 2 includes a first paper feeding section 2a that feeds recording paper 3 stored in a cassette (not shown) one by one, and a copying section 4.
It consists of a second sheet feeding section 2b provided in the middle of the path leading to.

5 is a conveyor belt for the recording paper 3 copied by the copying section 4; 6 is a fixing section for the recording paper 3 sent by the conveyor belt 5; 7
2 is a paper ejecting section that ejects the recording paper 3 after fixing.

A guide roller 8 is provided so as to be partially exposed on the paper discharge path 9 connecting the fixing section 6 and the paper discharge section 7, and the guide roller 8 is configured to actively rotate in the paper discharge direction. .

Reference numeral 10 denotes a movable guide plate whose tip end is curved so as to cover the guide roller 8 from the sheet discharge section 7 side. The guide roller 8 is pivotably supported, and a position P that covers the guide roller 8 and a retracted position P' can be selected by operating a solenoid (not shown) (see Fig. 2!, ■).

Reference numeral 12 denotes a duplex unit attached to the lower surface of the copying apparatus main body 1, and the duplex unit 12 linearly conveys the recording paper 3 flowing down along the movable guide plate 10 toward the next paper feeding means 2 side. It consists of a first unit 12a equipped with a conveyance path 13 for recording paper, and a second unit 12b equipped with a stacker 26 for storing recording paper. The first unit 12a
An upper plate 131 constituting the upper surface of the conveyance path 13 is screwed to the main body 1 of the copying apparatus. Also.

The lower plate 132 constituting the lower surface of the conveyance path 13 is connected to the upper plate 13
1 through a shaft 60.

The second unit 12b is connected to the first unit 12a via a hinge portion 14, and can be opened as shown in the third figure. A spring member 15 holds the first unit 12a in the open position, and the spring member 15 is connected to the first unit 12a and the second unit 12b near the hinge portion 14.
It is stretched between. 16 is a locking member that can be locked to a pin 16' provided on the first unit 12a to hold the second unit 12b in the closed position.

Reference numerals 61, 62, and 63 denote feed rollers that are pivotally supported by the upper plate 131 constituting the upper surface of the conveyance path 13 so that a portion thereof is exposed inside the conveyance path 13. are provided at the upstream, midstream, and downstream portions in the feeding direction. This downstream feed roller 63 is shown in FIG.

As shown in FIGS. 4 and 5, the drive gear 22 is fixed coaxially with the shaft 221 of the drive gear 22 which rotates in the direction of the arrow a in conjunction with the drive shaft 2b' of the second paper feed section 2b of the secondary paper feed means 2, as shown in FIGS. The downstream feed roller 63 is connected to the midstream feed roller 62, and the midstream feed roller 62 is connected to the upstream feed roller 61, which can be rotated in conjunction with each other by an endless belt or row 1222. In addition, the feed rollers 61 to
63 is a spring member 133 whose base end is fixed to the lower plate 132.
Pressure rollers 64, 65, and 66 which are pivotally supported on the tips of the rollers 64, 65, and 66 are in pressure contact with each other, so that the recording paper can be pinched and conveyed.

Therefore, at least the upstream feed roller 61 and the pressure roller 64 of the feed rollers 61 to 63 have a fifth
As shown in the figure, a roller is used that can form the recording paper into a wavy shape. Typical examples of this roller are shown in FIGS. 6I and 6N. In the case of FIG. They are installed side by side at intervals. Further, in the case of (3) in the same figure, the feed roller 61 is a short and small flat roller disposed on the shaft, and the pressure roller 64 is a short and small roller with a flange 64b disposed on the shaft.

The recording paper conveyed by these takes on a wavy shape as shown by the broken line.

Reference numeral 17 denotes a secondary sheet feeding means provided on the front side in the conveying direction of the conveying section 13, and the secondary sheet feeding means 17 is connected to the second unit 12.
A friction ring 19 (a friction belt may be used in some cases) fixed to the center of a shaft 18 inserted between the side frames attached to The feed prevention roller 20 and the shaft 20 of the double feed prevention roller 20
The roller 20 includes an auxiliary roller 21 which is pivotally supported by the tip of a lever 20b that is loosely fitted into the friction ring 19, and which is biased by a spring so as to come into pressure contact with the lower surface of the friction ring 19.

The friction ring 19 of the secondary sheet feeding means 17 can be switched between forward and reverse directions by the action of a gearing A provided at one end of the shaft 18 and a gearing B provided at the other end. Gear ration A uses a gear 22 connected to the drive shaft 2b' of the second paper feeding section 2b of the primary paper feeding means 2 and rotates in the direction of the arrow a as a driving source to rotate the friction wheel 19 in the direction of the arrow. is for rotation in the direction of arrow b', and these gears A.

B is switched by the action of solenoids A' and B'.

Reference numeral 30 denotes a push-up plate for the recording paper 3 housed in the stacker 26.

After fixing the recording paper that has been copied on one side, the movable guide plate 10
When the recording paper flows down along the conveyance path 13 of the first unit, the recording paper is sandwiched and conveyed by the feed roller 61 at the upstream portion of the conveyance path 13 of the first unit and the roller 64 that is in pressure contact with the feed roller 61.

The upstream feed roller 61 and pressure roller 64 are rollers that can form the recording paper into a wavy shape as described above. feed performance is improved.

In this way, the recording paper that has come out of the Wi feed path 13 is transferred to the second paper feeding means 1.
7 is housed in the stacker 26 by rotation of the friction ring 19 in the direction of arrow b'. In this case, the double feed prevention roller 20 which is in pressure contact with the friction ring 19 is free to rotate.

After a predetermined number of single-sided copies of the recording paper 3 are stored in the stacker 26, the friction wheel 19 is rotated in the direction indicated by the arrow, and the push-up plate 30 is moved upward before the rotation. The recording sheets are separated one by one from the stacker 26 and sent out through the opening 33, and then fed to the next sheet feeding means 2.
The recording paper path merges with the recording paper path, and the paper is fed to the copying section 4 again. As mentioned above, the recording paper fed to the copying section 4 is formed into a wave shape in the conveyance section 13, so even if the recording paper is strongly curled as a result of single-sided copying, the curl is corrected at this point. , improves separation performance from the photoreceptor drum 4a.

〔Effect of the invention〕

As explained above, the double-sided copying apparatus according to the present invention includes a conveyance path for inverting and conveying the recording paper after single-sided copying, a stacker for reversing and storing the recording paper, and a stacker for sending out the stacker recording paper. A double-sided copying apparatus equipped with a second paper feeding means is characterized in that a roller capable of forming the recording paper in a wavy shape is provided in the conveyance path, so that the recording paper copied on one side can be printed on one side during copying and fixing. Even if the paper curls due to heat, it will be formed into a wave shape in the conveyance path, so the curling property will be corrected and the paper passing performance in the conveyance path, paper feeding performance during re-feeding, and separation performance during re-copying will be improved. This has an excellent effect.

[Brief explanation of the drawing]

The figures show an embodiment of the invention, and FIG. 1 is an overall sectional view;
Figure 2 1. II is a cross-sectional view showing the action of the movable guide plate, FIG. 3 is a cross-sectional view with the second unit opened, FIG. FIG. 5 is a cross-sectional perspective view showing the feed roller and pressure roller of the conveyance path, and FIGS. 6I and If are front views showing embodiments of the corrugation forming roller. 1...-Copying device main body 2...-Next paper feeding means 3
- Recording paper 4 - Copying section 13 - Conveyance path 17 - Secondary paper feeding means 19 -
Friction wheel 26~・Stacker 61.62.6
3.-Feed roller 64, 65.66...-Pressure roller patent Applicant Konishiroku Photo Industry Co., Ltd. Figure 2 Figure 3 Figure 6 (I)

Claims (1)

[Claims] In the duplex copying apparatus, the duplex copying apparatus includes a conveyance path for reversing and conveying recording paper after single-sided copying, a stacker for reversing and storing the recording paper, and a secondary paper feeding means for feeding out the stacker recording paper. 1. A double-sided copying device characterized by being provided with a roller capable of forming recording paper in a wave shape in its path.