JPH066124Y2 - Paper feed mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a paper feed mechanism of a form printer (slip printer) for feeding paper by sandwiching the paper between a paper feed roller and a paper pressing roller.

[Prior Art] A conventional paper feed mechanism uses a slender gol roll and a slender metal roll to feed a paper, or a needle-like protrusion is formed on a part of a feed roller, and The method of preventing the meandering by sandwiching the paper between them has been adopted.

[Problems to be Solved by the Invention] However, in the conventional paper feeding mechanism, meandering depending on the setting state of paper, and parts such as needle-like protrusions have problems in durability and safety.

Therefore, the present invention provides a paper feed mechanism that can prevent the meandering, which has no problem in the setting state of paper, and has no problem in durability and safety by an inexpensive mechanism which does not have the conventional drawbacks. It is an object.

[Means for Solving the Problems] In order to solve the above problems, the paper feeding mechanism according to the present invention has a left and right paper feeding mechanism that is fixed to a paper feeding roller shaft rotated by an external driving means at a predetermined interval. In a paper feed mechanism including a roller and left and right paper pressing rollers that are arranged to face the paper feed roller and sandwich the paper by the paper feed roller, a left and right cylindrical paper feed rollers having different outer diameters The holding roller is arranged on the upstream side of the pressing portion that presses the paper feeding roller, is located on the side where the outer diameter of the paper feeding roller is large, and has a guide portion with which the side surface portion of the paper abuts. .

[Operation] When configured and arranged as described above, it is possible to always correct the deviation of the set state of the paper due to the difference in the feed amount due to the difference in the diameter of the paper feed roller, and to make a paper feed mechanism without meandering. Further, since a combination of a cylindrical paper feed roller and a paper pressing roller having no needle-shaped protrusion may be used, there is no problem in durability and safety.

[Embodiment] An embodiment according to the present invention will be described below with reference to the drawings. First
FIG. 1 is a perspective view generally showing a paper feeding mechanism according to an embodiment.

FIG. 2 is a plan view in which the paper is set with a shift of Δθ ₁ leftward with respect to the traveling direction C of the paper.

FIG. 3 is a plan view in which the paper is set with a deviation of Δθ ₂ rightward with respect to the traveling direction C of the paper.

The paper feed roller right 1 and the paper and roller left 2 are integrally fixed to the paper feed roller shaft 7. The paper pressing roller 3 and the paper pressing roller 4 are integrally fixed to the paper pressing roller shaft 8. The paper feed roller right 1 and the paper feed roller left 2 are rotated in the direction of arrow A by driving means from the outside, and the paper is nipped between the paper press roller 3 and the paper press roller 4 and moved in the direction of arrow C. It is a thing. The table 5 is in the form of a flat table, which is indispensable in the case of a slip printer and on which paper can be flatly set.

In this embodiment, the table has a guide portion 5a on the right side surface portion. When setting the paper, the guide portion 5a is set as a side reference. (In the present embodiment, the guide shape is formed by bending from the table 5, but this guide shape may be formed by other parts.) The roller diameter D1 of the paper feed roller right 1 and the paper feed roller left 2
The relationship with the roller diameter D2 is D1> D2, and the paper feed roller diameter difference ΔD (= D1-D2) is 0.1 to 0.2 mm.
The degree is enough.

The paper pressing roller 3 and the paper pressing roller 4 are supported by a paper pressing roller fulcrum member 9 located substantially at the center of the paper pressing roller 3, and another spring member (not shown) moves the paper feeding roller right through the paper 6 in the direction of arrow G. 1 and the paper feed roller left 2 are pressed against each other to generate a paper pressing force. Particularly, in this embodiment, the paper pressing roller has a free centering structure by the paper pressing roller fulcrum member 9 and always holds the paper by the right and left rollers, but about ΔD = 0.1 to 0.2 mm If the slip paper has a diameter difference of the paper feed roller of 0.1 to 0.6 mm, it is not necessary to have the free-centering structure as described above, and a general paper pressing method can be used. It is enough.

Now, as shown in FIG. 2, when the paper is set in a state of being shifted to the left by Δθ _{1 with} respect to the traveling direction C of the paper, the paper feeding roller 1 side has a larger amount of paper due to the diameter difference of the paper feeding roller. Since the paper is fed, the paper is fed with a slight deviation in the direction of arrow D, and the deviation amount Δθ ₁ at the time of setting is eliminated. After the deviation amount is further eliminated, the side surface portion of the paper and the guide portion 5a of the table 5 come into contact with each other, and the paper is fed while being always in contact with the guide portion 5a due to the straining strength of the paper. Guide part 5a
Is folded in parallel with the paper feeding direction, the paper is always fed parallel to the traveling direction C. Further, as shown in FIG. 3, when the paper is set in a state of being shifted to the right by Δθ _{2 with} respect to the traveling direction C of the paper, a paper feeding force F is generated due to a difference in the diameter of the paper feeding roller, and the guide portion 5a of the table is Contact point with paper 1
Due to the correction component f of the paper feed force F with 0 as the center of rotation, the paper is fed while being displaced in the arrow E direction. The deviation amount Δθ ₂ at the time of setting is gradually corrected and canceled while the paper is being fed.

After the deviation amount Δθ ₂ is eliminated and the guide portion 5a of the table comes into contact with the end portion of the paper to maintain the parallel state, the paper is always fed in the parallel state to the traveling direction C according to the idea of FIG. .

[Advantage of the Invention] As described above, according to the present invention, the cylindrical left and right paper feed rollers having different outer diameters and the paper pressing roller are arranged on the upstream side of the pressing portion that presses the paper feeding roller, and the paper feeding is performed. By having a guide portion located on the side where the outer diameter of the roller is large and in contact with the side surface portion of the paper, the load generated when the paper comes into contact with the guide portion is It occurs only on the downstream side of the pressing part of the paper pressing roller, but since the paper feeding force is stronger than the load, the paper is reliably conveyed while contacting the guide part. Therefore, even if the paper is thin and has no rigidity, the paper can be reliably conveyed and the meandering of the paper can be prevented.

Further, even when the width of the paper to be used changes and the position of the paper feed roller is changed, the paper feed roller is diverted so that the distance between the left and right rollers can be widened due to the cylindrical shape of the paper feed roller.

Furthermore, since it is a paper feeding roller and a paper pressing roller, it is possible to provide a highly reliable paper feeding mechanism having a remarkable effect that its handling is safe and durability is improved. The practical effect is extremely large.

[Brief description of drawings]

FIG. 1 is a perspective view generally showing a paper feeding mechanism according to this embodiment. FIG. 2 is a plan view in which the paper is set with a shift of Δθ ₁ leftward with respect to the traveling direction C of the paper. FIG. 3 is a plan view in which the paper is set with a deviation of Δθ ₂ rightward with respect to the traveling direction C of the paper. 1 …… Paper feed roller right 2 …… Paper feed roller left 3/4 …… Paper press roller 5 …… Table 6 …… Paper 7 …… Paper feed roller shaft 8 …… Paper press roller shaft

Claims (1)

[Scope of utility model registration request] 1. A left and right paper feed roller fixed at a predetermined interval to a paper feed roller shaft rotated by an external driving means, and a paper which is arranged so as to face the paper feed roller and is sandwiched by the paper feed roller. In a paper feeding mechanism including left and right paper pressing rollers, cylindrical left and right paper feeding rollers having different outer diameters, and the paper pressing roller is arranged upstream of a pressing portion that presses the paper feeding roller, and A paper feed mechanism, characterized in that it has a guide portion which is located on the side where the outer diameter of the paper feed roller is large and which abuts the side surface portion of the paper.