JPH0412057Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Table of contents] Industrial field of application Problems to be solved by the prior art invention Example of application to an electrophotographic printing device (Fig. 2) Effects of the invention [Industrial Field of Application] The present invention relates to a paper conveyance device for conveying continuous folded paper with perforations to a printing device using, for example, an electrophotographic recording method or an electrostatic recording method.

[Conventional technology]

FIG. 3 is a diagram for explaining a conventional paper conveyance device applied to a printing apparatus using an electrophotographic recording method.

In the figure, 6 is an initial charger (not shown), a photoconductor on which an electrostatic latent image is formed by an exposure source, and 7 is a developing device that develops the electrostatic latent image formed on the photoconductor 6 with toner to form a toner image. , 8 is a transfer charger for transferring the toner image on the photoreceptor 7 onto the continuous folding paper 1 with feed holes, and 9 is a cleaning brush for removing the toner image remaining on the photoreceptor 7.

Further, the continuous folding paper 1 with feed holes is produced by driving the guide plate 11, the transfer guide plate 12, , 13 to a fixing section (not shown).

Here, the continuous folding paper 1 with feed holes will be explained.

FIG. 4 is an explanatory diagram of the continuous folding paper 1 with feed holes.

As shown in the figure, the sheet 1 has feed holes 1a on both sides and perforations 1b formed at predetermined lengths, and is folded at each perforation 1b.

Further, the feed hole 1a is formed by punching with a cutter or the like. Thereafter, perforations 1b are formed on the paper at predetermined unit lengths,
It is folded at every perforation 1b and packed in a box.

[Problem that the invention attempts to solve]

As mentioned above, since the continuous folding paper 1 with feed holes has the feed holes 1a formed by punching with a cutter, the feed holes 1a are formed as shown in FIG. 5b.
A residual residue 1c may be generated.

Therefore, as shown in FIG. 5b, the remaining waste 1c
is caught in the feed hole 1a of the upper or lower paper 1, and if the continuous folded paper 1 with feed holes is conveyed in this state, two sheets may be fed in a pile.

When two sheets of continuous folded paper with feed holes are conveyed in a stacked state, the conveyance direction of the paper is changed by 180 degrees at the transfer charger 8, so that the double feed section hangs down and is rolled into the photoreceptor 7 side. It will be. Transfer charger 8
Since the gap between the transfer guide plates 12, 13 and the photoreceptor 6 at the part is extremely narrow, 0.5 to 0.7 mm, when the continuous folded paper 1 with feed holes is fed one after another,
The paper becomes jammed in that area, and the surface of the photoreceptor 7 is damaged. A damaged photoconductor 7 becomes unusable because it causes deterioration in printing quality, such as streaks or no printing.

In view of the above-mentioned conventional problems, the present invention prevents paper jams and damage to the photoreceptor by detecting double feeding of continuously folded paper with feed holes. An object of the present invention is to provide a paper conveying device that can perform the following tasks.

[Means for solving problems]

FIG. 1 is a block diagram of the principle of the present invention.

In Fig. 1, 1 is a continuous folding paper with feed holes;
Reference numeral 2 denotes a paper processing unit that performs a predetermined process (for example, printing) on the paper 1; 3, a conveying means that conveys the paper 1 to the paper processing unit 2; and 4, the conveyance direction of the paper 1 is reversed in the paper processing unit 2. A guide means 5 for guiding the paper 1 is a detection means for detecting multiple feeding of the paper 1 on the paper input side of the paper processing section 2, and is provided near the paper input side of the guide means to detect double feeding when reversing. This detects the drooping of the outer sheets of the double-fed sheets. 6 is the detection means 5
This is a control means that controls the conveying means 3 to stop the paper conveying operation based on the detection output.

[Effect]

The detection means 5 detects the paper with drooping on the outside,
When it is detected that multiple sheets of paper have been fed, the control means 6 stops the sheet conveyance operation of the conveyance means 3, so that the multiple sheets of paper 1 are not conveyed to the paper processing section 2 and the guide means 4 Paper jams that occur when the paper is reversed do not occur.

〔Example〕

FIG. 2 is an explanatory diagram of an embodiment of the present invention.

In the figure, parts that are the same as those in FIG. A drive control means for controlling the drive, 24 is a light emitting element, and 25 is a light receiving element.

Further, the light emitting element 24 and the light receiving element 25 are no longer engaged with the tractor pin 20, and the transfer guide plate 12
This is to detect the outer sheet 1' of the double-fed sheets that is not conveyed along the transfer guide plate 12 and hangs down outside the transfer guide plate 12.

The detection output of the light receiving element 25 is input to the drive control means 23. The drive control means 23 stops the drive of the motor 22 when there is a detection output from the light receiving element 25 indicating that there is a hanging sheet 1'.

Therefore, the continuous folding paper 1 with a feed hole has a feed hole 1a.
Even in the case of double feeding due to the remaining scraps 1c due to incomplete punching, the paper is not transported to the transfer charger 8, and no paper jam occurs, so the photoreceptor 6 is not damaged. .

[Effect of idea]

As described above, according to the present invention, it is possible to provide a paper conveyance device that can prevent paper jams even when paper is fed double.

[Brief explanation of the drawing]

Figure 1 is a block diagram of the principle of the present invention, Figure 2 is an explanatory diagram of an embodiment of the present invention, Figure 3 is an explanatory diagram of a conventional example, and Figure 4 is an explanatory diagram of continuous folding paper with feed holes. . In each figure, 1 is continuous folding paper with feed holes,
2 is a paper processing section, 3 is a conveyance means, 4 is a guide means,
5 is a detection means, and 6 is a control means.

Claims (1)

[Claims for Utility Model Registration] (1) Conveying means 3 for conveying continuous folded paper 1 with feed holes to paper processing section 2; Guide means 4 for guiding 1
a detection means 5 for detecting multiple feeding of the paper 1 on the paper input side of the paper processing section 2; and control so that the conveyance means 3 stops the paper conveyance operation based on the detection output of the detection means 5. The detection means 5 is provided on the paper inlet side of the guide means 4 and detects drooping of the outer paper of the double-fed paper during reversal. paper conveyance device. (2) The paper conveyance device according to claim (1), wherein the detection means 5 includes a light emitting element 24 and a light receiving element 25.