JPS58109350A - Conveyor - Google Patents

Abstract

PURPOSE:To prevent paper from being conveyed in an overlapped state, by using tractors to convey the paper through between rollers. CONSTITUTION:In tractors 3, pins 3b on revolving belts 3a are sequentially engaged in the feed holes 1a of paper 1 to convey it in a direction shown by an arrow (b). Both the ends 7a, 8a of slender rollers 7, 8 are coupled to each other by chains 10 hung with other chains 9 from a guide plate 2. Since the paper 1 is moved through between the rollers 7, 8 by the tractors 3, the paper is prevented from being conveyed in an overlapped state.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a conveying device for a long sheet such as fanfold paper used in an image forming apparatus such as a line printer or a laser beam printer. More specifically, the present invention relates to a conveying device that conveys long sheets without double feeding.

Hereinafter, a case will be explained using, as an example, a case in which 77-inch paper is used as the long sheet.

Line printers or laser beam printers that use fanfold paper have much better paper feeding stability than machines that use cut paper. However, if the fanfold paper is poorly processed) or if the ink preprinted on the fanfold paper is not sufficiently dry, double feeding as shown in the ex diagram may occur. In FIG. 1, 1 is fanfold paper, 2 is a guide plate, and 3 is a tractor for conveying the fanfold paper. The portion V shown by the person in the figure is a double feed, which is a phenomenon in which, for example, three pages of paper are fed overlappingly. Naturally, if double feeding occurs, a jam will occur, which may further cause a malfunction of the printer device. Nine, recent laser beam printers have very high paper feeding speeds (approximately 800 mm/cm).
5ec) Even if there is no problem with the paper, double feeding is likely to occur.

An example of a conventional technique for preventing double feeding is shown in Fig. 2.

In FIG. 2, 1 is a paper s2Fi guide plate, and 3 is a tractor. Further, 5 is a roller whose both ends are suspended by a chain 4 over the guide plate 2. 6 is a brush. In the device configured as described above, the roller 5 causes a pendulum motion to appropriately strike the paper IC)@@, thereby preventing double feeding. Further, the brush 6 applies paper IK tension to prevent double feeding. However, when the paper feeding speed increases to a high speed, the effect of preventing double feeding is insufficient. For example, when the paper feeding speed is high, the roller 5 is moved to the left side, and if the pressure of the brush 6 on the paper 1 is too high, the paper 1 may start to tear or come off the tractor 3. Not much effect can be expected to prevent transmission. Furthermore, if the paper l is preprinted (preprinted paper), double feeding may occur frequently even with the method shown in FIG. 2, depending on the type of printing ink and the degree of dryness.

SUMMARY OF THE INVENTION Therefore, the present invention provides a conveying device that can prevent double feeding of long sheets to a greater extent than ever before.

That is, the present invention provides a conveyance device for conveying a long sheet, including a first rod-like member, a second rod-like member, a supporting means for supporting both members in a movable state, and a conveying device for conveying a long sheet. The invention is characterized in that it has a conveying means for conveying through the medium. Furthermore, the present invention provides a conveying device for conveying a long sheet, in which a first rod-shaped member, a second rod-shaped member, a connecting member connecting both scissors members, and a connecting member connecting the centers of the first and second rod-shaped members. The method further includes: supporting means for supporting the connecting member in a movable state with a center line at an angle with respect to a vertical line; and a conveying means for conveying the elongated sheet through between the first and second rod-shaped members. It is expressed as a percentage.

The present invention will be described in detail below with reference to the drawings. FIG. 3 shows a first embodiment according to the present invention.

In the figure, 1 is fanfold paper, and 2 is a guide plate. Reference numeral 3 designates a tractor for transporting paper, which rotates in the direction of the arrow by receiving drive from a drive source (not shown). Here, the tractor 3 is configured so that the pin 3b on the rotating belt 3a is connected to the feed hole 1alt of the paper l.
They are engaged in sequence to transport the paper l in the direction indicated by the arrow. moreover,
7 and 8 are long and thin rollers, and both ends 7a and 8a of the rollers are connected by a chain IO.

This chain IO is further connected to the guide plate 2 by the chain 9.
hanging) Note that the O guide plate 2 is fixed to the main body.

With the above configuration, double feeding can be prevented by conveying the paper 1 between the rollers 7 and 8 by the tractor 3 as shown in the figure.

For example, according to the applicant's experiments, the distance between the rollers 7 and 8 is about 50 cm, the diameter of the aluminum row 27 and p-ra 8 is about 20 cm, the length is about 4001 cm, and the weight is about 200 to 300 cm.
The length of the PT chain 90 is approximately 200 to 250 yam (the length of one page of paper), and the paper 1 is approximately 470 cm/
If conveyed at a speed of 1.2 seconds, a good result without double feeding can be obtained.Since the roller 8 is suspended by a flexible member such as a chain, the row 27 and the roller 8 can escape properly even if the paper is made of cardboard. There is no need to run out of paper depending on the situation. Furthermore, since the rows 27 and 28 are unlikely to be completely separated from the paper l, a sufficient double-feed prevention effect can be exerted even for sheets that are prone to double-feed.

Furthermore, one other embodiment will be shown.

4 and 5 show a second embodiment to which the present invention is applied.

In FIG. 4, 1 is paper, 2 is a guide plate, and 3 is a tractor. Further, reference numeral 11-12 is a four-wheeler, and both ends thereof are rigidly fixed by connecting members 13 of 11a-12a. Furthermore, this connecting member 13 is suspended above the guide plate 2 by a chain 14. Figure 5 shows the roller 11-
It is a sectional view of 12 parts. Connecting member 13 and chain 14
The connection, that is, the attachment 15 of the chain 14 to the connecting member 13 is performed at a position eccentric to the center line B connecting the centers of the four-wheeler 11 and the roller 12. Therefore, the center sB is inclined upward by a distance of 0 from the vertical line C drawn perpendicularly from the center of the roller 11. In the embodiment shown in FIG. 5, the chain 14 is provided with an attachment 15 on the upper side of the connecting member 13 to the right of the center IIB. In the above configuration, if the paper 1 is conveyed through between the rollers 11 and 12 as shown in FIG. 4 or 5 WAK, the effect of preventing double feeding is very large. In addition, in this second embodiment, as in the first embodiment, even if the paper is made of thick paper, it is unlikely that the paper will run out.

According to the applicant's experiments, the length of the chain 14 and the roller 1
The distances 1 and 12 are the same lengths as in the first embodiment, and the inclination angle ge is approximately 1 (5) to 1 g to prevent double feeding.

It is preferable that the rows 27, 8, 11, 12JL, chains 9, 10, 14 and the connecting member 13 described above are electrically conductive, thereby preventing noise from being caused by static electricity.

Of course, the conductivity is limited to ah<, 18m. In this case, it is desirable to ground. Further, in this embodiment, an example in which an aluminum roller is used as a preferable example of the rod-shaped member O is shown, but the present invention is not limited to rollers, and may be used even if the rod-shaped member is made of, for example, a square timber or a flat plate. Furthermore, the material is not limited to aluminum, but may also be metal such as iron, wood, or the like.

In the case of insulating materials, it is preferable to apply conductive treatment.The supporting means is not limited to chains; for example, strands of stainless steel wire, or other flexible materials may be used. It is even better if conductive treatment is applied in the same manner.0 As described above, the present invention provides a conveying device that can convey long sheets without double feeding.

[Brief explanation of the drawing]

Figure w41 shows double feeding in fanfold paper■
Schematic diagram, Figure 112 is a schematic diagram showing a conventional example of a double feed prevention device - No. 3
The figure is a perspective view showing a tenth embodiment to which the present invention is applied, Fig. 3I4 is a perspective view showing a second embodiment to which the present invention is applied, and Fig. 5 is a perspective view showing a ninth embodiment to which the present IJl is applied. FIG. 9 is an enlarged cross-sectional view of a part of the embodiment. In the figure, 1 is a paper sheet, 2 is a guide plate 3, tractors 7, 8, 11, 12 are rollers 9, 10, 14, and a chain 13 is a connecting member. Applicant: Canon Co., Ltd. Ka3so-24゜1

Claims (3)

[Claims] (1) In a conveying device that conveys a long sheet, a first rod-shaped member. and a 20th rod-shaped member. A conveyance device comprising: a support means for movably supporting the inner core member; and a conveyance means for conveying the elongated sheet between the two members. (2) A first rod-shaped member in a conveyance device that conveys a long sheet. and a second rod-shaped member. a connecting member that connects the internal members, and a support means that supports the connecting member in a movable state such that a center line connecting the centers of the first and second rod-shaped members has an angle with respect to the vertical IIK; and a long sheet. The above 1st and 2nd. A conveying device comprising: a conveying means for conveying through between rod-shaped members. (3) The conveying device according to Claims (1) and (2), wherein the supporting means is a chain ◇ (4) Claim (1), wherein the conveying means is a tractor - No. (Transfer device described in Section 4).