JPS6377798A - 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 - Industrial Field of Application 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) in the downward direction, writing on the paper is obtained. The conventional paper feeding mechanism of this automatic drafting machine has the configuration shown in FIG.

The paper 13 is sandwiched between a drive roller 11 and a pair of pressure rollers 12 on both sides thereof, and the drive roller 11 is driven by a motor to send the paper 13 in the front-rear direction (X-axis direction).

The carriage 14 holds a writing instrument 15 and moves along the guide rail 1.
Move the writing instrument 1 in the left and right direction (Y-axis direction) on the trajectory of 6.
5 is driven in the vertical direction (Z
axial direction), and when drawing, the tip of the writing instrument 15 is placed on the paper 1.
3, and a written figure on the X-Y plane is obtained by the amount of feed of the paper 13 and the amount of movement of the carriage 14. 17 is paper 1
This is the No. 3 feed guide plate.

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 pressure roller 12, there must be no slippage between the drive roller 1] and the paper 13. In addition, in order to make the paper width arbitrary, the drive roller 11 is subjected to a surface treatment on its entire circumferential surface to increase its friction coefficient, 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.

The f1 objective of the present invention is to provide a paper feeding mechanism that does not cause slipping when feeding the paper, and also allows a good fit between the writing instrument and the paper by using paper of an arbitrary width.

-Means for Solving the Problems- In order to achieve the above-mentioned object, the present invention provides a friction roller type automatic drafting machine, in which the pressure roller has a circumferential surface covered with an elastic material and has a width greater than or equal to the width of the paper. The drive roller has a rough surface with a high friction coefficient on the circumferential surface and is divided into a plurality of parts to narrowly contact the paper with the pressure roller. This is what I did.

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

In FIGS. 1 and 2, reference numeral 21 designates a pair of drive rollers having a rough surface treated with a high friction coefficient on the circumferential surface, through which a prismatic shaft 22 is slidably inserted in the Y-axis direction. The shaft 22 transmits driving force. The shaft 22 is supported at both ends by bearings (not shown) and is driven by a motor 23 at one end.

z4 is a pressure roller, which has a length of −L greater than the width (maximum width) of the paper 25 used for writing, and whose peripheral surface is coated with a rubber elastic member 24a suitable for writing. The paper is coated and urged toward the drive roller 21 by the spring member 26 to narrow the paper between the drive roller 21 and the drive roller 21 .

The paper 25 is sandwiched between the drive roller 21 and the pressure roller 24 and is controlled to be fed in the front-rear direction (X-axis direction). 27 is a carriage, which moves the writing instrument 28 in the downward direction (Z-axis direction).
The motor 32 is driven in the left-right direction (Y-axis direction) on the track of the guide rail 29 via a traction wire 30 and a roller 31. The pen tip of the writing instrument 28 of this carriage 27 is positioned approximately toward the axis of the pressure roller 24, and the drive roller 21 is
The writing instrument 2B is provided with a distance layer, L6, so as to be located outside the movement space of the writing instrument 7 and the writing section 28. 33.
34 is a paper guide plate, of which 33 is a pressure roller 2
4 and the drive roller 21 with an inclination that substantially coincides with the tangential direction, and the pressure roller 34 is aligned with the direction of contact with the writing surface of the pressure roller 24. 35 is a blower for air suction, which generates air in the gap between the paper 25 and the pressure roller 24 and the gap between the paper guide plate 33.34 and the paper 25, and moves the paper 25 toward the pressure roller 24 side and the paper guide. The sheet 25 is brought into close contact with the plates 33 and 34 to eliminate floating of the sheet 25. The operation of the above configuration will be explained below.

The writing instrument 28 for writing is moved in the X-axis direction by feeding the paper 25 by rotating the drive roller 21. This feeding is performed by the friction force between the paper 25 and the surface of the drive roller 21 due to the pressing force between the pressure roller 24 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 25 in the X-axis direction by the drive roller 21 and the pressure roller 24, the rough surface of the drive roller 21 is pressed by the elastic part 24a of the pressure roller 24, and the paper 25 is pressed. It is fed while being bit into the roller 24. By this feeding, the drive roller 21
To eliminate slippage between the paper 25 and the paper 25. This feeding operation is
As shown in the first figure, when a narrow paper 25a is used as the paper 25, if the drive roller 21 is moved to the positions on both sides of the paper 25a, the same feeding operation will occur and the paper 25 can be fed without slipping. Moreover, since the contact between the paper 25 and the pressure roller 24 is performed by the elastic member 24a, and the frictional force necessary for paper feeding is obtained by the drive roller 21 as described above, the drive roller 21 has a significantly high coefficient of friction. Even if the paper has a rough surface, the pressure roller 24 can improve the conformability even to thin paper. In addition, the slippage between the pen tip of the writing instrument 28 and the paper 25 is improved to improve drawing quality.

Effects of the Invention - As is clear from the above description, the present invention provides a drive roller with a roughened peripheral surface so as to generate the frictional force necessary for paper feeding, a pressure roller with a writing instrument surface, and a pressure roller with a writing instrument surface. 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 4(B) are front views of main parts showing a conventional paper feeding mechanism. 21... Drive roller, 24... Pressure roller, 24a... Elastic member, 25. 25a... Paper, 33. 34... Paper guide plate, 27... Carriage, 28... Writing implements.

Claims (1)

[Claims] 1) A drive roller and a pressure roller that is in contact with the drive roller with the paper in between sends the paper back and forth, and moves the carriage back and forth on a guide rail in the left and right directions with respect to the paper. In a friction roller type automatic drawing machine in which a writing instrument mounted on the carriage is driven vertically with respect to the paper, the pressure roller has a peripheral surface covered with an elastic material and has a length equal to or greater than the width of the paper. to constitute a writing surface for the writing instrument, and the drive roller has a rough surface with a high friction coefficient on the circumferential surface and is divided into a plurality of parts so that the paper is brought into narrow contact with the pressure roller. The paper feeding mechanism of automatic drafting machines is a feature.