JPH0624239Y2 - Paper feeder for automatic drafting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a sheet feeding device of an automatic drafting machine that moves a writing instrument and a sheet in the X and Y directions for drawing.

2. Description of the Related Art In an automatic drafting machine that moves a sheet along a paper guide in the Y direction and moves a carriage equipped with a writing instrument in the X direction, the paper moves in the Y direction along the paper guide. Further, a pressure roller and a drive roller are arranged above and below the paper guide, and the pressure roller can be moved up and down so as to be in pressure contact with or separated from the drive roller.

Problems to be Solved by the Invention In such a sheet feeding device, since the pressing roller is directly moved up and down to press the driving roller, the pressing roller may not be properly pressed to the driving roller due to the mounting error of the pressing roller. .

Further, if a pair of left and right drive rollers and a pressure roller are respectively arranged on both sides orthogonal to the moving direction of the writing instrument in order to move the paper smoothly, the four pressure rollers must be moved up and down, which is a troublesome operation. Becomes

As shown in Japanese Utility Model Publication No. 59-79351, 4
There is known a device in which two rollers are moved up and down by one lever to come into pressure contact with and separate from a platen. With this device, the rollers are attached to a swinging support arm through a support shaft. Therefore, the roller may not be properly pressed against the platen due to a mounting error or the like.

In view of this, the present invention provides a paper feeding device for an automatic drafting machine in which four pressing rollers can be vertically moved in synchronization with one operating lever and the pressing rollers can be properly pressed against the driving rollers even if there is an error in mounting. The purpose is to do.

Means and Actions for Solving the Problems A horizontal shaft is rotatably supported horizontally above the paper guide, and one end of the left and right arms is fixed to both ends of the horizontal shaft.
Mounting horizontal shafts equipped with rear side press rolls on the other ends of the left and right arms are mounted vertically swingably and with a downward swinging bias, and the front side is mounted on the left and right mounting brackets attached to both sides of the horizontal shafts. A supporting arm equipped with a presser roll is swingable up and down and is urged downward by oscillating, and at least one of the right arm and the left and right arms is oscillated downward by a spring, and an operating lever is used. It is possible to swing upward with a rotating cam,
A pair of front and rear presser rolls can be moved up and down with a single operating lever, and each presser roll can be reliably pressed against the drive roll even if there is a mounting error or the like.

Example As shown in FIG. 5, the automatic drafting machine has a guide rail 3 extending horizontally between upper portions of a left frame 1 and a right frame 2 and a paper guide 4 attached between lower portions thereof. 3, a carriage 6 provided with a writing instrument 5 is provided so as to be movable in the left-right direction (X direction), and a slit-shaped opening 7 is formed in a portion of the paper guide 4 facing the lower part of the carriage 6 in the longitudinal direction. Then, opening windows 8 are formed on the front, rear, left and right sides of the slit-shaped opening 7, respectively, and the underlay roll 9 is made to face the slit-shaped opening 7, and the drive roll 10 is made to face each opening window 8. The drive roll 10 has a front side press roll 11 and a rear side press roll 12
Are pressed to move the paper in the front-back direction (Y direction).

An auxiliary opening window 8'is formed inside the front opening window 8, and an auxiliary driving roll 10 'faces the auxiliary opening window 8', and by moving the front pressing roll 11 left and right, the auxiliary driving roll 8'is moved. 10 'can be pressed.

As shown in FIG. 1, a horizontal shaft 20 is rotatably supported horizontally across the front sides of the left and right frames 1 and 2.
One end of the left arm 21 and one end of the right arm 22 are connected to both ends of each of the left and right arms 21, 22 and the mounting blocks 23 are fixed to the other ends of the left and right arms 21 and 22, respectively.
As shown in FIG. 2, a mounting body 24 is rotatably supported by pins 25 on the upper and lower portions of the mounting body 3 as shown in FIG.
The mounting horizontal shaft 26 fixed to 4 projects inward from the elongated holes 1a and 2a of the left and right frames 1 and 2, and the rear pressing rolls 12 are rotatably supported at the projecting ends, respectively, as shown in FIG. The mounting body 24 is urged downward by a spring 27 mounted across the left and right arms 21 and 22 and the mounting horizontal shaft 26 so that the stopper piece 28 abuts the side surface 23 a of the mounting block 23 and the mounting horizontal shaft 26. Is held in a slightly downward position,
When the rear side press roll 12 is brought into pressure contact with the drive roll 10, the mounting horizontal shaft 26 is placed in a substantially horizontal posture.

The lateral shaft 20 is provided with left and right side pieces 29a, 29a of a pair of left and right mounting brackets 29 so as to be slidable left and right, and the base portion of the support arm 30 is vertically swingable between the side pieces 29a, 29a of the respective mounting brackets 29. While being supported, the front pressing roll 11 is attached to the tip of the support arm 30 which has a two-pronged shape.
Is rotatably supported by a pin 31, and the support arm 30 is urged downward by a spring 32 so as to be held in a slightly downward position, and is supported when the front side press roll 11 is pressed against the drive roll 10. The arm 30 has a substantially horizontal posture.

A downward cam surface 33 is formed at the tip of the right arm 22, a cam 35 of a rotating shaft 34 rotatably supported by the right frame 2 faces the cam surface 33, and the right arm 22 is a spring. The cam surface 3 is urged to swing downward by 36.
3 is in contact with the cam 35, and an operating lever 37 is fixed to the rotary shaft 34.

A sheet pressing plate 38 is fixed to the left and right mounting horizontal shafts 26 so that the sheet can be smoothly inserted from the rear side to the front side along the sheet guide 4 and set.

The left arm 21 is also urged downward by a spring 36 and pressed against the upper portion of the stopper 1b attached to the left frame 1.

Note that either the left arm 21 or the right arm 22 may be urged to swing by a spring.

Since the right arm 22 is normally swung downward by the spring 36 and the cam surface 33 is in pressure contact with the lower portion of the cam 35 during normal operation, the mounting horizontal shaft 26 rotates downward and the horizontal shaft 20 rotates slightly downward. In this state, the front and rear presser rolls 11 and 12 are pressed against the drive roll 10.

At this time, the mounting horizontal shaft 26 swings slightly upwards against the spring 27, and the support arm 30 swings slightly upwards against the spring 32, so that the springs 27 and 32 absorb mounting errors and the like. Thus, the front and rear presser rolls 11 and 12 can be reliably pressed against the drive roll 10.

Further, when the operation lever 37 is operated upward to rotate the cam 35 together with the rotary shaft 34, the high portion of the cam 35 causes the cam surface 3 to move.
3, the right arm 22 swings upward, and the mounting horizontal shaft 26
As the horizontal shaft 20 rotates and the mounting bracket 29 swings upward, the front-rear side press roll 1
1 and 12 move upward and separate from the drive roll 10.

At this time, the mounting horizontal shaft 26 and the support arm 30 are slightly swung downward by the springs 27 and 32, but the upward swinging stroke of the mounting block 23 and the mounting bracket 29 is larger than the swinging stroke thereof. The side press rolls 11 and 12 are separated from the drive roll 10.

The drive roll 10 may have a long shape that is integrated in the left-right direction.

Effect of the Invention By operating the single operation lever 37 and rotating the cam 35, a pair of left and right presser rolls 11, 11, 1
2 and 12 can be moved up and down to be pressed against and separated from the front and rear drive rolls 10, and the mounting horizontal shaft 26 including the support arm 30 having the front presser roll 11 and the rear presser roll 12 is a horizontal axis. 20 and the right arm 22 can be swung up and down, and the springs 32 and 27 are urged downward so that mounting errors and the like are absorbed by the springs 32 and 27, and the driving roll 10 is reliably pressed. be able to.

[Brief description of drawings]

The drawings show an embodiment of the present invention. Fig. 1 is a partially cutaway plan view, Fig. 2 is a sectional view taken along the line II-II of Fig. 1, Fig. 3 is a perspective view, and Fig. 4 is an automatic drafting machine. FIG. 5 is a vertical sectional view of FIG. 4 is a paper guide, 10 is a drive roll, 11 and 12 are front and rear pressing rolls, 20 is a horizontal axis, 21 is a left arm, 22 is a right arm, 26 is a mounting horizontal axis, 27 is a spring, 29 is a mounting bracket, 30 Is a support arm, 32 is a spring, 33 is a cam surface, 3
5 is a cam, 36 is a spring, and 37 is an operating lever.

Claims (1)

[Scope of utility model registration request] 1. A drive roll 10 is arranged in front of and behind the paper guide 4 in the paper feed direction, and a pair of left and right front press rolls 11, 11 and a pair of left and right rear press rolls 12, 12 are pressed against each drive roll 10. In the paper feeding device for moving the paper in the front-rear direction, the horizontal shaft 20 is rotatably supported horizontally above the paper guide 4 along the direction orthogonal to the paper feeding direction, and at both ends of the horizontal shaft 20. Left arm 21
And one end of the right arm 22 are connected to each other, and the other end of the left arm 21 and the right arm 22 supports the mounting lateral shaft 26 that supports the rear presser roll 12 and can swing up and down by a predetermined stroke.
A pair of left and right mounting brackets 2 attached to both sides of the horizontal shaft 20 are mounted by swinging downwardly at 7 respectively.
Mounting arm 3 supporting the front side press roll 11 on 9, 29
0 is swingable up and down by a predetermined stroke and is urged downward by a spring 32 to be attached to the left and right arms 21,
A paper feeding device for an automatic drafting machine, characterized in that at least one of the members 22 is rocked downward by a spring 36 and the cam surface 33 is brought into pressure contact with a cam 35 rotated by an operating lever 37.