JPH0337520B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drum-type automatic drawing machine that continuously draws drawings on a roll of drawing paper.

Conventionally, the paper feed shaft, drum, and take-up shaft of a drum-type automatic drafting machine have been arranged on the same plane, and the paper buffer section has been arranged perpendicular to the drum. However, according to this method, the paper buffer section is arranged in front and behind the drum, and the drawing paper feed shaft and winding shaft are arranged further outside, making it difficult to reduce the depth of the device. It was hot. Further, when replacing the drawing paper, there are also disadvantages such as having to reach a position deep inside the device to handle the heavy drawing paper.

In order to eliminate the above-mentioned drawbacks, the present invention makes the paper buffer section inclined with respect to the drum, and the drawing paper feed shaft and take-up shaft are arranged above and below the drum, thereby making the device more compact and improving operability. The purpose is to improve.

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings. Reference numeral 1 denotes a roll-shaped drawing paper, which has positioning holes 1a at both ends. A drum 2 has sprocket pins 2a at both ends for positioning the drawing paper 1. The carriage 3 has a writing instrument 3a. 4 is the belt, 5a, 5
b is the buffer of drawing paper 1, 6 is the paper feed shaft,
7 is a winding shaft. Motors 8, 9, 10, and 11 drive the drum 2, belt 4, paper feed shaft 6, and winding shaft 7, respectively.

In the above structure, the buffers 5a and 5b are inclined toward the drum 2, and the angle of inclination θ is within a practical range of about 20° to 40° with respect to the vertical. Also,
The paper feeding shaft 6 and the winding shaft 7 are arranged in the vertical direction of the drum 2.

Next, the operation will be explained. The drawing paper 1 is attached to a paper feed shaft 6, and is wound onto a winding shaft 7 via a buffer 5a, a drum 2, and a buffer 5b.
Further, the drawing paper 1 is positioned by the positioning holes 1a that match the sprocket pins 2a provided on the outer periphery of both ends of the drum 2, and the motor 8 drives the drum 2 to reciprocate by a control section (not shown). , the drawing paper 1 reciprocates in the direction of rotation of the drum. The carriage 3 is driven by a motor 9 via a belt 4 and reciprocates on the axis of the drum 2. The carriage 3 holds a writing instrument 3a so as to reciprocate up and down, and draws on the surface of the drawing paper 1.
The insides of the buffers 5a and 5b are under negative pressure due to air suction from a fan (not shown), and the drawing paper 1 is brought into close contact with the surface of the drum 2 by being suctioned within the buffers. The drum 2 is reciprocated by drawing data sent from a control unit (not shown),
The drawing paper 1 moves back and forth depending on the rotational direction of the drum. Depending on the amount of movement, the drawing paper 1 is fed and wound up by the paper feeding shaft 6 and the winding shaft 7, respectively. The inertia of the paper feeding shaft 6 and the winding shaft 7 is larger than that of the drum 2, so the response is slow, and the drum 2
There will be a time difference until the rotational speed is reached. The buffers 5a and 5b are provided to absorb this time difference, and a part of the rolled drawing paper 1 is slackened in the buffers, and the drawing is carried out on the drum 2.
However, in order to avoid applying excessive force to the drum 2 and the paper 1 when feeding the paper with rapid acceleration/deceleration toward the take-up shaft side and the paper feed shaft side, the paper feed shaft 6 and the take-up shaft 7 are Until the rotational speed of the drum 2 reaches the rotational speed of the drum 2, the drawing paper 1 is supplied and absorbed inside the buffers 5a and 5b. Since the drawing paper 1 is attracted by the buffers 5a, 5b by negative pressure, the above-mentioned effect will not be impaired even if the buffers 5a, 5b are tilted with respect to the drum.

As described above, according to the configuration of the present invention, by tilting the buffer with respect to the drum, the paper feeding shaft and the winding shaft can be arranged above and below the drum, so that the depth dimension of the device can be reduced. It has the advantage that the drawing paper can be easily replaced from the front of the device, and furthermore, as the device becomes smaller, it is possible to reduce the weight, which has great effects.

[Brief explanation of the drawing]

The drawing is a perspective view showing a schematic configuration of a drum-type automatic drawing machine according to the present invention. 1...Drawing paper, 1a...Positioning hole, 2...
...Drum, 2a... Sprocket pin, 3... Carriage, 4... Belt, 5a, 5b... Buffer, 6... Paper feed shaft, 7... Winding shaft, 8, 9, 1
0,11...Motor.

Claims (1)

[Claims] 1 A sprocket pin for driving the drawing paper provided on the outer periphery of the drum positions the roll of drawing paper and smoothly feeds and winds up the drawing paper in a drum-type automatic drawing machine that creates drawings. A drum-type automatic drafting machine characterized in that a paper buffer section provided for this purpose is inclined with respect to the drum, and a paper feed shaft and a winding shaft for drawing paper are arranged above and below the drum.