JPS6377797A - Sheet-feed mechanism for automatic drawing instrument - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a friction roller type automatic drawing machine, and more particularly to a writing paper feeding mechanism.

1. Conventional technology - A friction roller type automatic drawing machine sends paper in one axis direction by friction drive using a drive roller and a pressure roller, sends a carriage in a direction perpendicular to this feeding direction, and loads the paper on the carriage. By driving the writing instrument (recording pen) -1-downward, writing on the paper is obtained. The conventional paper feeding mechanism of this automatic drafting machine has the configuration shown in FIG. A drive roller 11 and a pair of pressure rollers 12 on both sides of the drive roller 11
The paper 13 is sandwiched between the rollers 11 and 13, and the drive roller 11 is driven by a motor to send the paper 13 in the front-rear direction (X-axis direction). The gear ridge 14 holds the writing instrument 15 and moves in the left-right direction (Y-axis direction) on the trajectory of the guide rail 16, and the writing instrument 15 is driven downward (Z-axis direction) by a drive source provided in the carriage 14. , to draw, press the tip of the writing instrument 15 against the paper 13, and adjust the feed amount of the paper 13 and the carriage 1.
A writing figure on the X and -Y planes is obtained using the moving star 4. 1
7 is a feeding guide plate for the paper 13.

Problem to be Solved by the Invention - In the conventional feeding mechanism, in order to reliably feed the paper 13 by the drive roller 11 and the pressure roller 12, there must be no slippage between the drive roller 1 and the paper 13. is the condition, and in order to make the paper width arbitrary, the entire circumferential surface of the drive roller 11 is subjected to a surface treatment to increase the coefficient of friction, as shown in FIG. 4(A).

This surface treatment causes unevenness on the circumferential surface of the drive roller 11, which impairs its compatibility with the paper and significantly increases the friction between the writing instrument 15 and the paper 13. For this reason, when using thin paper, the line segment quality of drawn figures and the life of the writing instrument are reduced. To solve this problem, the drive roller 11 is replaced with a pressure roller 1 as shown in FIG. 4(B).
It is conceivable to perform a surface treatment to increase the coefficient of friction only on both side portions 11a where 2 is pressed. However, with this structure, the position of the pressure roller 12 in the Y direction is restricted to one location, and the paper width is also limited to one type. In other words, when the paper width is narrow, if the pressure roller 12 is moved to both sides of the paper, the paper cannot be fed reliably.

It is an object of the present invention to provide a paper feeding mechanism that does not cause slippage when feeding the paper and can use paper of any width to improve the fit between the writing instrument and the paper.

- Means for Solving the Problems - In order to achieve the above-mentioned object [1], the present invention provides a friction roller type dynamic drawing machine, in which the drive roller has its peripheral surface covered with an elastic material, and the pressure roller is constructed with a rough surface that increases the friction coefficient of the circumferential surface.

One Embodiment - Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2.

In FIGS. 1 and 2, 21 is a drive roller supported by bearings at both ends and driven by a motor 22 at one end. 23 is a pressure roller, and the drive roller 21
It is elastically pressed against the circumferential surface of and can be moved freely in the Y-axis direction. Reference numeral 24 denotes a paper used for writing, which is sandwiched between the drive roller 21 and the pressure roller 23 and is
The feed is controlled in the axial direction). Reference numerals 25 and 26 indicate paper guide plates, which are located before and after the writing surface of the drive roller 21 to guide the paper 2.
4. Guides the forward and backward feeding.

Reference numeral 27 denotes a carriage, which holds the writing instrument 28 so as to be drivable in the vertical direction (CZ axis direction), and drives the motor 3 along the track of the guide rail 29 via a traction wire 30 and a roller 31.
2 in the left-right direction (Y-axis direction).

Here, as shown in the second diagram, the entire circumferential surface of the drive roller 21 is coated with a rubber elastic member 21a or the like. on the other hand,
The pressure roller 23 has a surface treated to have a rough surface with concavities and convexities that increase the surface friction coefficient.

The operation of the above configuration will be described below.

The writing instrument 28 for writing is moved in the X-axis direction by feeding the paper 24 by rotating the drive roller 21. This feeding is performed by the friction force between the paper 24 and the surface of the drive roller 21 due to the pressing force between the pressure roller 23 and the drive roller 21 .

The writing instrument 28 is moved in the Y-axis direction by reciprocating the carriage 27 by rotation of the motor 33. Also, writing utensil 2
8 in the Z-axis direction is performed by turning on and off a drive source on the carriage 27.

Here, regarding the feeding of the paper 24 in the X-axis direction by the drive roller 21 and the pressure roller 23, the rough surface of the pressure roller 23 is pressed by the elastic portion 21a of the drive roller 21, and the paper 24 is moved to the drive roller. Send it in a state where it bites into 21. By this feeding, the drive roller 21
To eliminate slippage between the paper 24 and the paper 24. This feeding operation is
As shown in the first figure, when a narrow paper 24a is used as the paper 24, if the pressure roller 23 is moved to the positions on both sides of the paper 24a, the paper 24 can be fed in a similar manner without slippage. Moreover, since the contact between the paper 24 and the drive roller 21 is performed by the elastic member 21a, and the frictional force necessary for paper feeding is obtained by the pressure roller 23 as described above, the drive roller 21 has a significantly high coefficient of friction. The rough surface allows it to blend well even with thin paper. Further, since the writing surface is made of an elastic material and an appropriate amount of friction is maintained between the pen tip of the writing instrument 28 and the paper 24, drawing quality is improved.

Effects of the Invention - As is clear from the following explanation, the present invention provides a pressure roller with a roughened peripheral surface so as to generate the frictional force necessary for paper feeding, and a driving roller with a rough surface on the pressure roller. Since it has an elastic surface that absorbs the unevenness of the rough surface, it is possible to stably feed paper of any width, and also to improve the fit between the writing surface and the paper, resulting in high-quality drawings.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the present invention, and Fig. 2 is a perspective view showing an embodiment of the present invention.
FIG. 3 is a side view of a conventional main part, and FIGS. 4(A) and 4CB) are front views of main parts showing a conventional paper feeding mechanism. 21... Drive roller, 21a... Elastic member, 23... Pressure roller, 24. 24a... Paper, 25. 26... Paper guide plate, 27... Carriage, 28... Writing implements.

Claims (1)

[Claims] 1) A drive roller having a writing surface and a pressure roller that is in contact with the drive roller with the paper in between sends the paper in the front and back direction, and moves the paper on a guide rail in the left and right direction with respect to the paper. In a friction roller type automatic drawing machine that reciprocates a carriage and drives a writing instrument mounted on the carriage in a vertical direction relative to the paper, the drive roller has a peripheral surface covered with an elastic material, and the pressure roller has a surface covered with an elastic material. A paper feed mechanism for an automatic drafting machine characterized by having a rough surface with a high friction coefficient on the circumferential surface.