JPH0665499B2 - Paper feed mechanism - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to improvement of a paper feeding mechanism of a recording apparatus such as a so-called pin feed unit, and more particularly to a paper feeding mechanism provided with a rotatable paper control means.

[Prior art]

A pin feed unit, which is generally used as a paper feed mechanism of a printer, can be detached from a printer which is a recording device. FIG. 1 is a perspective view when the pin feed unit 4 is attached to the printer 2. In this pin feed unit 4, the holes of the continuous paper 6 with holes on both sides are engaged with the pins of the pin wheel 8, and the paper 6 is It is held between the tractor 10 and the tractor lid 12. Reference numeral 14 in the drawing denotes a gear chamber, and a gear (not shown) in the gear chamber 14 and a gear (not shown) in the printer 2 are engaged with each other, and the gear in the printer 2 is rotationally driven. The driving force is gear chamber 1
The paper 6 is sent by being transmitted to the gears in 4, the square shaft 16 and the pin wheel 8 to rotate the pin wheel 8.

Usually, inside the printer 2, a friction rotation means (not shown) is provided inside so that a cut paper without holes on both sides other than the continuous paper 6 with holes on both sides can be used, and the cut paper is conveyed by this friction rotation means. can do. However, when the continuous paper 6 with holes on both sides is used, if both the friction rotation means and the pin wheel 8 are fed to feed the paper, the two cannot be synchronized. Therefore, the friction rotation means is not driven and the pin wheel 8 is not driven. It is usual to feed paper only by itself. However, at this time, there is no engagement between the paper 6 and the friction rotation means, so that the paper 6 sags. For this reason, conventionally, there has been a method in which the printer 2 or the like is provided with a paper pressing means composed of a wire or the like, and the paper pressing means is made to act on the paper 6 before it is inserted into the printer 2 to slacken the paper 6. However, such a method has a drawback that the structure of the paper pressing means is complicated and the cost is increased.

Further, when a cut sheet having no holes on both sides is used with the pin feed unit 4 attached, the friction rotating means inside the printer 2 is used to feed the cut sheet without using the pin wheel 8. However, in general, the cut paper or the like is often curled at the end thereof, so that the end of the cut paper may be caught between the tractor 10 and the tractor lid 12 to hinder the subsequent paper feeding.

〔Purpose〕

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to realize a paper feeding mechanism which is simple in construction, has a low manufacturing cost, and can reliably feed paper in order to solve the above-mentioned drawbacks.

The configuration of the present invention for achieving the above object is provided with a rotating means capable of conveying continuous paper and cut paper, and a pin engaging with a hole formed in the continuous paper, and rotating the pin by moving the pin. A tractor for conveying the continuous paper conveyed by the means, a tractor lid for guiding the continuous paper to a position where the pin and the hole are engaged, and a cut sheet conveyed by the rotating means for the tractor and the tractor lid. A first position for guiding the cut sheet to a position away from the continuous sheet path between the tractor and the tractor lid to prevent the sheet from being sandwiched between the tractor and the tractor cover, and the continuous sheet conveyed by the rotating means and the tractor to the back position. A paper control means movable by rotating to a second position in contact with the continuous paper on the upstream side of the rotating means for applying tension. A paper feed mechanism, characterized in Rukoto.

〔Example〕

Hereinafter, embodiments of the present invention will be described specifically and in detail with reference to the drawings.

FIG. 2 shows a plan view of a pin feed unit which is the paper feeding mechanism of the present embodiment. In the present embodiment, a pair of paper control means 20 is provided on the rod 18 of the pin feed unit 4.
20 is rotatably provided. In the figure, 22 is a support rod.

FIG. 3 is an enlarged perspective view of a portion corresponding to part III in FIG. 1 in the present embodiment, in which A is a paper feeding side of the printer 2 which is a recording device, and B is a paper feeding side of the printer 2. is there. In the figure, the paper control means 20 is shown in a state of being turned over to the paper feeding side A, and in this state, the thickness of the protrusion 24 formed on the paper control means 20 is larger than the thickness of the tractor lid 12.
FIG. 4 is a sectional view taken along the line MM in FIG. 2 and shows the operation of the paper control means 20. The paper control means 20 when it is turned over to the paper sending side A is shown by a solid line (and a broken line) in the printer. The paper control means 20 which has been turned over to the paper feed side B of No. 2 is shown by a one-dot chain line. As shown in the figure, when the paper control means 20 is tumbled to the paper delivery side, the projecting portion 24 is projected, and when the paper control means 20 is tumbled to the paper feed side B, the top surface of the paper control means 20 is substantially It is configured to be horizontal. 26.2 in the figure
Denoted at 8 are a paper feed port and a delivery port provided in the printer.

Next, the operation will be described. FIG. 5 is a sectional view of the pin feed unit 4 when the continuous paper 6 with holes on both sides is used. At this time, the paper control means 20 is turned over to the paper feed side B of the printer 2. When the continuous paper 6 with holes on both sides is used, the rotary friction means built in the printer 2 is not driven and the paper is fed by the pin wheel 8 (FIG. 1). For this reason, the slack occurs in the paper as described above, but the paper control means 2
Since 0 is placed on the continuous paper 6 with holes on both sides of the paper feed side, back tension is given by the weight of the paper control means 20 and the slack of the continuous paper 6 with holes on both sides is removed. Further, the continuous paper 6 with holes on both sides sent from the delivery port 28 of the printer 2 is conveyed along the upper surface of the paper control means 20, but is smoothly conveyed because the upper surface of the paper control means 20 is substantially horizontal. . That is, the paper control unit 20 serves as a guide for the paper 6.

FIG. 6 shows the case where the cut sheet 30 having no holes on both sides is used. At this time, the rotary friction means built in the printer 2 and the cut sheet 30 come into contact with each other to friction feed the cut sheet 30. Thus, the cut sheet 30 is fed. At this time, if the paper control means 20 is turned over to the paper delivery side A of the printer 2, the tip end of the cut paper 30 is the tractor 10 and the tractor lid 12 (first (Fig.) Can be prevented from getting caught.

The present invention is not limited to the above-described embodiment, and for example, the tractor may be of a belt type instead of a pin feed type, and the paper feeding mechanism cannot be attached to or detached from the recording device and is integrated with the recording device. It may be something.

〔effect〕

As described above in detail and specifically, according to the present invention, reliable paper feeding can be performed, and the cost of the paper can be reduced because the construction of the paper pressing means is simple.

[Brief description of drawings]

FIG. 1 is a perspective view when a pin feed unit is attached to a printer, FIGS. 2 to 6 are views relating to the present embodiment, FIG. 2 is a plan view of the pin feed unit, and FIG. 3 is a part III in FIG. 4 is an enlarged perspective view of a portion corresponding to FIG. 4, FIG. 4 is a sectional view taken along the line MM of FIG. 2, and FIGS. 5 and 6 are explanatory views showing the action of the paper pressing means. In the figure, 2 ... printer, 4 ... pin feed unit, 12 ...
... tractor lid, 20 ... paper control means, 24 ... protruding portion,
A: Paper feeding side, B: Paper feeding side.

Claims (1)

[Claims] 1. A rotating means capable of conveying continuous paper and cut paper, and a pin engaging with a hole formed in the continuous paper, wherein the continuous paper conveyed by the rotating means is moved by moving the pin. In order to prevent the tractor to be conveyed, the tractor lid that guides the continuous paper to the position where the pin and the hole are engaged, and the cut paper that is conveyed by the rotating means from being caught between the tractor and the tractor lid, A first position for guiding the cut sheet to a position away from the continuous paper path between the tractor and the tractor lid, and the rotating means for applying back tension to the continuous paper conveyed by the rotating means and the tractor. A paper feed mechanism that is movable by rotating to a second position in contact with continuous paper on the upstream side of the paper feed mechanism. .