JPH0748595Y2 - Multi-part medium transport device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a multi-part medium conveying device used in a printer or the like.

Conventional Technology First, a conventional example is shown in FIGS. 3 and 4. FIG. 3 is a side view of a medium conveying device used in a printer. In the figure, 1 is a printing unit in which a print head 2 and a platen 3 are opposed to each other, and 4 is a medium passage through which a medium 30 passes. Is a pair of guide plates
It is formed by making 5 and 6 face each other with a predetermined gap. In the vicinity of the printing unit 1, the upper part of the medium passage 4 is formed by making the guide plate 5 and the other guide plate 6 face each other. Further, a feed roller 8 and a pinch roller 9 which are in contact with each other in the medium passage 4 are arranged to face each other. The shaft 10 to which the feed roller 8 is fixed is connected to a motor (not shown), and the shaft 11 to which the pinch roller 9 is connected is urged toward the feed roller 8 and is provided with an arm 12 (fourth (See the figure).
As a result, the pinch roller 9
Have been contacted elastically.

Therefore, the medium 30 can be conveyed to the printing unit 1 by the feed roller 8 and the pinch roller 9.

FIG. 4 is a plan view of the medium passage 4 as seen from the printing section 1 side. As shown in FIG. 4, a multi-part medium 13 is used instead of the ordinary medium 20. It also needs to be transported. The multi-part medium 13 is, as represented by a slip, a plurality of paper sheets stacked and glued on one side. However, the multi-part medium 13 is glued on one side. The part 14 is stiffer than the other parts. On the other hand, if the facing distance between the guide plates 5 and 6 is increased, the shafts 10 and 11
Has a limit because it contacts the back of the guide plates 5 and 6, and
If the facing distance between the guide plates 5 and 6 is large, it is difficult to guide the multi-part medium 13 in the narrow space between the print head 2 and the platen 3. For this reason, the distance between the guide plates 5 and 6 cannot be widened, and when the medium passage 4 is curved, the portion of the gluing portion 14 does not curve smoothly. As a result, the frictional resistance between the gluing portion 14 and the medium passage 4 increases, and the multi-part medium 13
Transport failure occurs. Therefore, in the office machine that conveys the multi-part medium 13, the medium passage 4 is not curved, but the route of the medium passage 4 cannot be freely changed, which has a great influence on component placement.

Means for Solving the Problems A gluing portion for binding a plurality of laminated sheets is formed by a pair of curved guide plates facing each other with a predetermined gap for passing a multi-part medium formed on one side A medium passage, a feed roller and a pinch roller that are in contact with each other in the medium passage, a shaft that holds the pinch roller and a feed roller that are located at a position where the gluing surface of the multi-part medium passes. It is composed of a small diameter portion formed on at least one of the shaft and an open space formed by widening a facing interval of a part of the guide plate by the small diameter portion.

By widening the facing distance between the guide plates in the part facing the gluing part, the frictional resistance between the gluing part and the medium passage can be reduced, and multi-part media can be conveyed. Since the facing space of the guide plates can be narrowed in the portion opposite to the other portions, the multi-part medium can be accurately guided to a desired position, which results in a curved medium passage. However, it can be set freely.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 and 2. The same parts as those described in FIGS. 3 and 4 are designated by the same reference numerals, and the description thereof will be omitted. An open space 15 is formed at least at the curved portion of the medium passage 4 so as to face the gluing portion 14 of the multi-part medium 13. That is, only the portion of the shaft 10 that holds the pinch roller 9 at the position where the gluing portion 14 passes is formed with the small diameter portion 16 having a reduced diameter d, and a portion 5a of the guide plate 5 is formed by the reduced dimension. The other guide plate 6,
An open space 15 is formed by separating it from 7. The diameter of the shaft 11 other than the small diameter portion 16 is D which is thicker than d.

In such a structure, the multi-part medium 13 is held by the rotating feed roller 8 and the pinch roller 9 and conveyed to the printing unit 1 from one end of the medium passage 4. In this case, the medium passage 4 is curved, and the gluing portion 14 of the multi-part medium 13 is stiff and cannot be smoothly curved. Since a wide open space 15 is formed, the glue part
The frictional resistance between the medium 14 and the medium passage 4 is reduced to make the multi-part medium 13
Can be transported smoothly. Further, since the space between the medium passages 4 can be narrowed in the portion located at the position where the portion other than the gluing portion 14 of the multi-part medium 13 passes, the multi-part medium 13 is separated from the print head 2 and the platen 3. You can accurately guide you in a narrow space. Further, although a part of the shaft 11 becomes thin due to the formation of the small-diameter portion 16, the small-diameter portion 16 is located at the end of the shaft 11 which is difficult to bend, so that the strength is not affected.

Effect of the Invention Since the present invention is configured as described above, the frictional resistance between the gluing portion and the medium passage is reduced by increasing the facing distance between the guide plates at the position where the gluing portion passes. Since it is possible to convey a multi-part medium, the facing space of the guide plates can be narrowed at a portion located at a position where a part other than the gluing portion of the multi-part medium passes, so that the multi-part medium is desired It can be accurately guided towards the position, which allows it to be set freely even in curved media passages, and in addition, part of the feed roller or pinch roller shaft can be made narrower due to the formation of a small diameter section. However, since the small-diameter portion is located at the end portion of the shaft that is difficult to bend, it has the effect of not being affected by the strength.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention. FIG. 1 is an enlarged side view showing an upper portion of a medium passage, FIG. 2 is a plan view thereof, and FIGS. 3 and 4 are shown. Is a conventional example,
FIG. 3 is a side view of the medium passage, and FIG. 4 is a plan view thereof. 4 ... Medium path, 5-7 ... Guide plate, 8 ... Feed roller, 9 ... Pinch roller, 10, 11 ... Shaft, 13 ... Multi-part medium, 14 ... Gluing section, 15 ... Open space, 16 …… Small diameter part

Claims (1)

[Scope of utility model registration request] 1. A medium passage formed by a pair of curved guide plates facing each other with a predetermined gap for passing a multi-part medium having a glue portion for binding a plurality of stacked sheets on one side. A feed roller and a pinch roller that contact each other in the medium passage, a shaft that holds the pinch roller and a shaft that holds the feed roller at a position where the gluing surface of the multi-part medium passes. And a small-diameter portion formed on at least one of the two, and an open space formed by widening the facing interval of a part of the guide plate by the small-diameter portion.