JPH0739901Y2 - Roller vacuum transport device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a roller-vacuum conveying device that conveys a sheet by suctioning one side of a sheet with a vacuum device and pressing it against a conveying roller.

[Conventional technology]

When a toner image is conveyed to a conveying device at a stage where the toner image is not yet fixed, such as immediately after the image is transferred onto one side of a transfer sheet and then developed, as in the case of a copying machine. However, when the transfer sheet is conveyed by a conveying device that uses a pair of rollers that face each other vertically, the toner image is separated from the transfer sheet. Therefore, in such a case, a toner image is formed. A roller-vacuum transporting device is used in which one side of the other side is sucked and pressed against a transport roller provided on only one side by a vacuum device to transport it.

As the roller vacuum transporting device, for example, there is one as shown in FIGS. 7 to 9, and as shown in FIG. 7, a plurality of (two are shown) transporting rollers 2 are fixed to the roller shaft 1. The respective conveying rollers 2 are provided so as to slightly project upward from the openings 3a respectively formed in the guide plate 3 corresponding thereto.

As shown in FIG. 8, a suction box 5 communicating with a bakhumun 4 is provided under the guide plate 3, and a sufficient seal is provided between the guide plate 3 and the suction box 5 so that the arrow when the bakhumun 4 is rotated. The sheet P is sucked by the suction force generated in the direction A, and is conveyed in the direction B while being pressed against the conveyance roller 2 rotating in the direction indicated by the arrow.

[Problems to be solved by the device]

However, as shown in FIG. 9, such a conventional roller vaccum transport device has a transport roller 2 and a guide plate 3 as shown in FIG.
The sheet P is sucked from the gap S between the peripheral edge 3b of the opening 3a and pressed against the conveyance roller 2, so that the sheet P is attracted by the suction force to the outer edge portions 2a of both side surfaces of the conveyance roller 2. Since the sheet is pressed against the guide plate 3 and the peripheral edge 3b of the guide plate 3, the pressing of the sheet against the guide plate 3 hinders the sheet conveyance by the conveyance roller 2 and reduces the conveyance efficiency. There was a problem.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a roller-buckume transport device with good transport efficiency that can reliably transport a sheet without complicating the mechanism.

[Means for Solving the Problems]

For this reason, the roller-vacuum conveyance device according to the present invention is a roller-vacuum conveyance device that conveys a sheet while suctioning one side of the sheet by the vacuum device and pressing the sheet against the conveyance roller. A plurality of coaxial conveying rollers are provided in the openings formed in the guide plate for guiding the paper, respectively so as to slightly project from the paper guide surface of the guide plate. The suction port is arranged so that its center position is located on the line connecting the points at which the respective adjacent transport rollers between the plurality of transport rollers come into contact with the paper and does not project from the outer peripheral surface of each of the transport rollers. It was set up.

[Action]

According to the roller-vacuum transport device configured as described above, when a sheet is sucked by the vacuum device, the sheet is sucked at a portion corresponding to a line connecting points at which the transport rollers adjacent to each other come into contact with the sheet. Then, only the part near the suction port of the vacuum pipe is pressed against the transport roller in a state close to line contact and cannot be pressed against the guide plate.Therefore, press the paper other than the transport roller that interferes with the paper transport. Since the pad does not occur, it can be efficiently transported.

〔Example〕

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

FIG. 1 is a perspective view of a roller bucket carrying device showing an embodiment of the present invention, FIG. 2 is a side view showing a part of the roller bucket carrying device in section, and FIG. It is a top view.

As shown in FIG. 1, this roller-vacuum conveying device is provided with two conveying rollers 12A, 12A (which can be increased if necessary).
Are arranged coaxially with the roller shaft 11 at a predetermined interval, and are spaced in the carrying direction indicated by arrow C, and the carrying rollers 12B, 12B are provided coaxially with the same roller shaft 11 (hereinafter, unless otherwise specified). The transport rollers 12 are simply arranged at predetermined intervals.

And, between the respective transport rollers 12A, 12A and 12B, 12B,
The suction port 14a of the vacuum device 10 that sucks the lower surface of the paper P (FIG. 2) and presses it against each of the transport rollers 12 has the center position thereof as shown in FIG.
It is arranged close to the contact points a and b that come into contact with and the vacuum pipe 14 is attached so as to be inclined in the carrying direction.

The transport rollers 12A and 12B are provided with respective roller shafts 11 for fixing them.
Is driven by a drive motor (not shown) and is rotatable in the direction of arrow D in FIG. 2, and is formed on the guide plate 13 corresponding to each of the two coaxial transport rollers 12A and 12B. Each opening 13a, which shows only one of them in FIG. 3,
13b (same shape) is inserted from the lower side, and the upper end portion thereof is slightly projected from the upper surface 13c of the guide plate 13.

Therefore, the paper P fed on the guide plate 13 along the direction indicated by the arrow E in FIG. 2 is conveyed by the conveyance rollers 12A, 12B and the contact portions a, b which are arranged at intervals. Contact each other.

The vacuum device 10 has two vacuum pipes 14 each having a suction port 14a whose end is parallel to the upper surface 13c of the guide plate 13 and obliquely cut, and a diameter for gathering the vacuum pipes 14 into one pipe is larger than that of the vacuum pipe 14. The main pipe 15 and a vacuum case 16 having a discharge port 16a formed at the bottom thereof are built in, and generate a suction force in the F direction shown in FIG. 2 when the vacuum fan 17 is rotated by a motor (not shown). It is configured by the generating unit 20.

The vacuum pipe 14 is composed of two coaxial transport rollers 12A,
12A, 12B and 12B are installed between them, and neither of them interferes with the transport rollers 12A and 12B, and is arranged so as not to contact the roller shaft 11 either.
It does not interfere with the transportation of the paper.

Next, the operation of this embodiment configured as described above will be described.

The sheet P is conveyed on the guide plate 13 shown in FIG. 2 in the arrow E direction by another conveying means (not shown), and the leading end of the sheet P first rotates in the arrow D direction on the front side (left side). Laura 12
When the position A is reached, the suction force generated in the arrow F direction by the rotation of the vacuum fan 17 is applied to the suction port 14a.
From the transport roller 12 by the suction force.
It is transported while being pressed against.

Then, when the leading edge of the sheet P is conveyed to the conveying roller 12B on the downstream side (right side in FIG. 2), it is similarly sucked.
It is pressed against the transport roller 12 by the suction force from 4a,
It is conveyed in the direction of arrow E.

By the way, in this roller-vacuum conveying device, since the central position of each suction port 14a of the vacuum pipe 14 is mounted in close proximity to the contact portions a and b (FIG. 2) between the conveying rollers 12A and 12B and the paper P, respectively. When the paper P is sucked at the time of transportation, the paper P is brought into contact with the transportation roller 12 as shown in FIG. 3 only on one transportation roller 12A side.
Contact is made at the contact portion Ta (portion indicated by hatching) in a state close to line contact centered on a and b (for convenience, shown by a line connecting the transport rollers).

Therefore, as in the conventional case (Fig. 9), the paper is opened 13a.
Since it is not pressed against the peripheral edge portion 13d (also in the case of 13b), the transfer efficiency is improved by the amount of unnecessary pressing of the paper against the guide plate 13 which hinders the transfer of the paper.

In addition, this roller-bake worm transport device is provided with upper and lower guide plates 23a, 23b between the pair of rollers 21 and 22 shown in FIG.
A conveyance device using a pair of rollers that nips and conveys the paper P guided and fed by the line contact (d ₁ and d ₂ are contact portions) with high efficiency (contacts both sides of the paper with the rollers). It is possible to obtain a transportability close to (unable to be used if it is not possible) even though it is a single-sided contact transport device.

FIG. 5 shows another embodiment in which a large number of transport rollers are coaxially fixed, and parts corresponding to those in FIG. 3 are designated by the same reference numerals.

In this roller-vacuum conveying device, four conveying rollers 12 are fixedly mounted on a roller shaft 11 at predetermined intervals, and a vacuum pipe 14 of the vacuum device 10 similar to that shown in FIG. The center position of each suction port 14a is arranged close to the contact point a between the transport roller 12 and the sheet (for convenience, shown by a line connecting the transport rollers).

In this case, the transport roller 12 is configured to contact the attracted paper and the contact portion a.
Since contact is made at the contact portion Ta '(portion indicated by hatching) in a state close to the line contact centering on the center, it is a single-sided contact conveying device similar to the above-mentioned embodiment, but it has excellent conveying efficiency. Obtainable.

FIG. 6 shows a further different embodiment, and the portions corresponding to FIGS. 1 and 2 are designated by the same reference numerals.

This roller conveyor system has two conveyor rollers 1
2, 12 are arranged on the same axis as the roller shaft 11 with a predetermined space therebetween, and are further arranged on the same roller shaft 11 with a space therebetween 2
Although not shown in the drawing, a vacuum device 10 similar to that shown in FIG. 2 is provided, and the center position of each suction port 14a of the vacuum pipe 14 is arranged between the transfer rollers 12 and 12 by a transfer roller 12 It is arranged close to the contact point a with the paper (see FIG. 2).

Even in this case, it is possible to obtain the same effect as that of each of the above-described embodiments.

In each of the above-described embodiments, an example is shown in which separate transport rollers are arranged coaxially with a predetermined spacing, but the transport roller is provided with a plurality of rollers spaced at a predetermined spacing. The roller shaft may be integrally fixed to the roller shaft.

[Effect of device]

As described above, according to the present invention, when the sheet is conveyed, only the position near the contact portion between the conveying roller and the sheet is sucked and the sheet is conveyed while being pressed against the conveying roller. The transfer efficiency is improved because it is not pressed against the transfer rollers other than the transfer rollers that hinder the transfer.

Also, the structure of the device itself is simple, so it is easy to maintain.
Reliability is improved because troubles due to breakdowns are reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a roller bucket carrying device showing an embodiment of the present invention, FIG. 2 is a side view showing a part of the roller bucket carrying device in section, and FIG. FIG. 4 is a plan view, FIG. 4 is a side view showing an example of a transfer device using a pair of rollers with good transfer efficiency, and FIG. 5 is a plan view showing another embodiment in which a large number of transfer rollers are coaxially fixed. FIG. 6 is a perspective view showing a further different embodiment in a simplified manner, FIGS. 7 to 9 are perspective views showing an example of a conventional roller vaccum conveying device, a side view showing a part in section and a paper sheet. FIG. 6 is a cross-sectional view showing a contact state between a transport roller and a guide plate. 10 …… Bakiumu device, 11 …… Roller shaft 12 …… Conveying roller, 13 …… Guide plate 14a …… Suction port, a, b …… Contact part P …… Paper

Claims (1)

[Scope of utility model registration request] 1. A roller-vacuum transport device for transporting a sheet while suctioning one side of the sheet by a vacuum device and pressing it against a transport roller, wherein a plurality of the transport rollers are coaxially arranged at a predetermined interval. , A plurality of coaxial conveying rollers are provided in each opening formed in the guide plate for guiding the paper so as to slightly project from the paper guide surface of the guide plate, and a suction port of the vacuum pipe of the vacuum device is provided. The center position is located on the line connecting the points at which the respective adjacent transport rollers between the plurality of transport rollers contact the sheet, and is arranged so as not to project from the outer peripheral surface of each of the transport rollers. Characteristic roller backing transport device.