JPS6020115A - Recording form feeding mechanism - Google Patents

Abstract

PURPOSE:To improve a feeding accuracy by providing a smooth cylindrical part and plural projecting parts which are capable of putting a flaw consisting of a minute groove or hole to a recording paper, on the outside circumferential part of a pin wheel. CONSTITUTION:A recording form 1 placed between pin wheels 2, 2' and a roller 8 is pressed against a cylindrical part 7 of the pin wheel on which a minute groove or hole is pierced by projections 6, 6'. In this state, when a driving motor 3 is rotated, the recording form 1 is fed with a high accuracy without sliding against the cylindrical part 7. Also, even if said driving motor is rotated in reverse, as for the recording form 1, the groove or the hole pierced already by the projections 6, 6' is engaged with the original projection again, and the feed error is not integrated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an X-Y plotter, and more particularly to a recording paper drive device that is optimal for reversibly driving recording paper without a feed hole.

[Background of the invention]

Conventionally, X-Y plotters have two methods: a method in which a recording element is guided by two axes (x, y axes) that intersect on a recording sheet fixed in a flat surface and records in S-movement, and a method in which the recording element is driven reversibly in one direction. There is a method in which recording is performed by relative movement between a recording sheet and a recording element that moves and is guided along a single axis perpendicular to the recording sheet. The former is called the flatbed method and the latter is called the drum method, and the former has been mainly used for small and medium-sized machines, and the latter for large and medium-sized machines. Furthermore, the former has the characteristic that the recorded state is easy to see, but the installation area of the apparatus is large, whereas the latter is the opposite. Furthermore, the latter method includes a method in which the recording paper is fed using an all-tin rocket and a method in which the recording paper is fed by friction between rollers, each of which requires a feed hole in the paper.

The disadvantage was that the feed accuracy was poor. On the other hand, recently there has been a demand for a reduction in floor space and the ability to use paper without perforations (for example, commercially available graph paper or drawing paper).

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a small and easy-to-use X-Y plotter that does not have a feed size and can use paper of a size smaller than that of a drum-type X-Y plotter.

[Summary of the invention]

The present invention has one narrow-necked pin wheel or a plurality of pin wheels for driving the paper, and a plurality of small pin wheels sufficient to make minute grooves or holes in the paper on the highly precise and smooth outer circumference of the pin wheel. The roller is provided with a protrusion and is further provided with a rotatable roller whose surface is covered with an elastic material such as rubber for pressing the paper against the outer periphery of the pin wheel. By holding the drive shaft movably in the axial direction on a drive shaft that is reversibly rotated by a drive motor, it is possible to easily use sheets of different sizes and widths, and it is also possible to feed with high precision.

[Embodiments of the invention]

Next, embodiments of the present invention will be described with reference to the drawings.

One or more pin wheels 2, 2 that drive the recording paper 1
' is fixed or movable in the axial direction (even in the latter case, it is not fixed in the rotational direction), and the rotation of the drive motor 3 is transmitted by a belt, gears, or other joints to the drive shaft 4, which rotates in forward and reverse directions. is maintained). On the other hand, on the outer periphery of the pin wheels 2, 2', there are a plurality of protrusions 6, 6' that can be bored into the recording paper 1 with minute grooves (scratches) or holes 71Il sufficient to prevent the pin wheels from sliding on the outer periphery. is formed. The protrusion 6 is attached to the needle, thin plate, and grains, but the pin wheel 2
It is formed by knurling, gear cutting, pressing, etc. on the outer periphery. Further, the cylindrical portion 7 on the outer periphery of the pin wheel 2° 2' without the protrusion 6 is finished with high precision so that the outer periphery length is a predetermined dimension.

On the other hand, recording paper 1? Il-Pinch the pin wheel 2.2'
The outer M is pressed with a predetermined pressure against the outer periphery of the
A roller 8 covered with an elastic body such as J't rubber is rotatably held.

In the above configuration, the recording paper 1, which is held between the pin wheels 2, 2' and the roller 8, is pressed against the cylindrical portion 7 of the pin wheel, which has minute grooves or holes made by the protrusions 6, 6'. It will be done. When the drive motor 3 is rotated in this state, the recording paper 1 is fed by a high precision V without slipping on the cylindrical portion 7 of the pin wheel. Further, even if the drive motor is reversed, the grooves or holes already made in the recording paper 1 by the protrusions 6.about.6' will again engage with the original protrusions to prevent feed errors from accumulating a4.

On the other hand, as described above, the pin wheel is held movable in the axial direction, and by moving it in accordance with the width of the recording paper 1, it is possible to use paper of any width without feed holes. Of course, it is necessary to make the width of the roller 8 wider than the movement range of the pin wheel. Further, even if the position of the roller 8 in contact with the pin wheel 2.2' moves and a difference occurs in its diameter, the paper feeding accuracy will not change because it is determined only by the dimensions of the pin wheel 2.2'.

The material of the holder 8 is preferably rod-shaped rubber (for example, hardness 40 to 60°) that is sufficient to wrap around the protrusion 6 of the pin wheel and press the recording paper against the cylindrical portion, and has a protrusion height rj of 0.
i~i Il'l m is good. On the other hand, during recording, the roller is pressed against the recording paper by the force of a spring, etc., but when inserting and removing the paper, it is necessary to use your hands! 1III or a structure that can release the pressing force electrically is good.

〔Effect of the invention〕

According to the present invention, it is possible to feed recording sheets of different paper widths without feed holes with an accuracy of 11.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

Claims (1)

[Claims] 1. In a recording device having a drive motor, one or more pin wheels rotated by the drive motor, and a roller that presses recording paper against the pin wheels, A recording paper feeding mechanism characterized by having a smooth cylindrical part and a plurality of protrusions sufficient to inflict scratches in the form of minute grooves or holes on the recording paper on the outer peripheral part. 2. The recording paper feeding mechanism according to claim 1, wherein the pin wheel is held movably in the axial direction with respect to its rotating shaft.