JP2501510Y2 - Paper feeder of automatic drafting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a paper feeding mechanism in a friction roller type automatic drafting machine.

[Conventional technology]

The friction roller type automatic drafting machine sandwiches a sheet between a driving roller and a pressure roller to feed the sheet in a uniaxial direction by frictional driving, feeds a carriage in a direction orthogonal to the feeding direction of the sheet, and carries the carriage on the carriage. By driving the writing instrument (recording pen) described above in the vertical direction, desired drawing is performed on the paper.

A conventional paper feeding mechanism in such a friction roller type automatic drafting machine has a structure as shown in FIG.

That is, the sheet 5 is nipped by the drive roller 1 and a pair of pressure rollers 4 supported by a pair of levers 3 each having a tension spring 2 attached to one end, and the drive roller 1 is driven by a motor to move the sheet 5 in the front-back direction. (X-axis direction in the figure). The carriage 6 carries the writing instrument 7 and moves in the left-right direction on the axis of the guide rail 8 (direction perpendicular to the plane of the drawing,
That is, the writing tool 7 is moved to the carriage 6
Is driven in the up-down direction (Z-axis direction in the drawing) by a drive source (not shown) to press the leading end of the sheet 5 against the sheet 5, and the feed guide plate 9 is moved depending on the feed amount of the sheet 5 and the movement amount of the carriage 6.
A desired figure in the XY plane is obtained on the sheet 5 supported above.

[Problems to be solved by the device]

The conventional paper feeding mechanism as described above has a structure in which the pressing force is kept constant by the spring 2 when the paper 5 is sandwiched by the pressure roller 4, and this pressing force is drawn on a film or thick paper. It is set higher to prevent misalignment. Therefore, in the case of paper quality such as thin paper or trancing paper, the sandwiched part may be deformed or discolored white, it becomes difficult to maintain the drawing accuracy, and in the case of trancing paper the discolored part However, there is a problem in that a problem occurs as a drawing because the color changes during copying.

In view of the above points, the present invention is to provide a sheet feeding mechanism that can obtain a pressing force of a pressure roller suitable for a sheet.

[Means for solving the problem]

According to the present invention, the above problem is solved by connecting the pressing force adjusting means to the pressure roller. That is,
As a means for solving the above problems, the present invention sandwiches a sheet between a driving roller and a pressure roller facing the sheet and feeds the sheet in the front-rear direction, and the carriage reciprocates on a guide rail in the left-right direction with respect to the sheet. In a friction roller type automatic drafting machine that draws on the paper by vertically driving the writing instrument carried on the carriage with respect to the paper, the pressing force of the pressure roller against the drive roller is adjusted. The pressing force adjusting means is connected to the pressure roller so that the force for sandwiching the paper by the pressing roller can be arbitrarily set according to the property of the paper, and the pressing force adjusting means is attached to one end of the pressing roller. Lever, a spring lever rotatably attached to the bracket, a tension spring connecting the spring lever and the lever, and the spring lever. And an eccentric roller for changing the vertical position of the handle, a handle for operating the eccentric roller, and a set position setting plate having a plurality of notches capable of locking the end of the handle. It is characterized by the paper feeding mechanism of the automatic drafting machine.

[Operation] According to the present invention, the pressing force adjusting means of the pressure roller is actuated according to the quality of the paper to adjust the pressing force of the pressure roller against the driving roller to obtain a pressing force suitable for the paper to be used. It is possible to avoid deformation and discoloration of the paper,
It is possible to maintain drawing accuracy.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a drive roller, which is rotationally driven by a motor (not shown) to feed the paper 5 in the X direction shown by the arrow in the figure, that is, in the front-back direction (X axis direction). Reference numeral 4 denotes a pair of left and right pressure rollers, and each roller 4 is rotatably supported at one end of a pair of left and right levers 3 rotatably supported at the lower end of the bracket 10. One end of a tension spring 2 is attached to the other end of each lever 3, and the other end of this spring 2 is attached to the center of a spring lever 11 rotatably attached to the upper end of a bracket 10. The pressure roller 4 is pressed against the drive roller 1 by the spring force. And this pressure roller 4
The sheet 5 is sandwiched between the drive roller 1 and the drive roller 1, and the sheet 5 is fed in the X-axis direction by the rotation of the drive roller 1 as described above.

A writing instrument 7 is arranged between the left and right pressure rollers 4, 4 so as to be movable in the left-right direction with respect to the sheet 5, that is, in the direction (Y-axis direction) perpendicular to the plane of the drawing. This writing instrument 7 is carried by a carriage 6, which is a bracket.
It is supported on the track of a guide rail 8 attached to 10 so as to be movable in the Y-axis direction. Further, the writing instrument 7 is driven by a drive source (not shown) provided on the carriage 6 in a direction perpendicular to the sheet 5, that is, in the vertical direction (Z-axis direction shown by the arrow in the figure), and the tip of the writing instrument 7 presses the sheet 5. There is.

In this way, a desired drawing can be obtained on the sheet 5 by the amount of movement of the sheet 5 in the X-axis direction, the amount of movement of the carriage 6 in the Y-axis direction, and the pressing force of the writing instrument 7 in the Z-axis direction. . The sheet 5 is supported by a feed guide plate 9 arranged below the sheet 5 and is fed while maintaining a correct flat shape.

The present embodiment further has means for adjusting the pressing force of the pressure roller 4 against the drive roller 1. The pressing force adjusting means comprises a spring lever 11 to which the tension spring 2 is attached, an eccentric roller 12 for changing the vertical position of the spring lever 11, and a handle 13 for operating the eccentric roller 12. The eccentric roller 12 is rotatably supported by the machine frame so that its outer peripheral edge contacts the spring lever 11, and one end of the handle 13 is fixed to a rotary shaft 14 of the eccentric roller 12. The other end of the handle 13 is locked to a set position setting plate 15 fixed to the machine frame. As shown in FIG. 2, the set position setting plate 15 has several U-shaped notches 16 in the front-rear direction. One of these notches 16 is selected and the handle 13 is attached to this. By locking, the position of the spring lever 11 in the vertical direction is set. In addition, the second eccentric roller is contacted with the lever 3.
Numeral 17 is rotatably supported on the machine frame, and the second eccentric roller 17 is operated to rotate the lever 3 in the clockwise direction to raise the pressure roller 4 so as to prepare for setting the paper 5. There is.

The operation of the present embodiment configured as above will be described.

The paper 3 is sandwiched between the driving roller 1 and the pressure roller 4 and is X-shaped.
Although it is sent in the axial direction, the pressing force of the pressure roller 4 at this time is determined by the spring force of the tension spring 2. Since one end of the tension spring 2 is connected to the lever 3 and the other end is connected to the spring lever 11, when the handle 13 is moved in the direction of arrow A, the eccentric roller 12 rotates and the displacement of the spring lever 11 corresponding to the amount of eccentricity is caused. can get. As a result, the tension of the tension spring 2 connected to the spring lever 11 is increased or decreased, and the pressing force of the pressure roller 4 can be adjusted.

Therefore, for example, when using thin paper or treasuring paper, the handle 13 is moved forward, and the notch 16 provided on the set position setting plate 15 shown in FIG. 2 is used.
When it is locked in the leftmost notch, the spring lever 11 descends, so that the tension of the tension spring 2 decreases and the pressure of the pressure roller 4 is exerted. This avoids deformation and discoloration of the paper due to excessive pressing force. On the contrary, when the paper is thick paper, it is necessary to increase the pressing force of the pressure roller 4, so the handle 13 is moved backward and the rightmost notch 16 shown in FIG.
When the spring lever 11 is raised, the tension of the tension spring 2 increases accordingly, and the pressing force of the pressure roller 4 suitable for thick paper can be obtained.

In this way, according to this embodiment, the optimum pressing force of the pressure roller for each sheet can be easily obtained.

A normal friction roller type automatic drafting machine has a paper pressing force of about 6 kg, but this is because heavy paper is assumed, and about 2 kg is sufficient for thin paper. According to this embodiment, it is possible to adjust the paper pressing force of 2 kg to 6 kg.

[Effect of device]

As described above, according to the present invention, when the paper is fed, the force for nipping the paper can be adjusted to an optimal state according to the property of each paper, and thus the drawing can be performed. It is possible to avoid damage such as deformation and discoloration, ensure printing accuracy and stable paper feed, and perform high-quality printing without discoloration. Further, according to the present invention, since the pressing force adjusting device for the pressure roller is constituted by the handle and the set position setting plate having the notch at the operating position of the handle, that is, the position corresponding to the pressing force, each sheet can be operated with one touch. It is possible to obtain a pressing force suitable for, and it is possible to determine which paper is adjusted to a suitable pressing force by just looking at the position of the handle. Therefore, it is possible to obtain an adjusting device having better operability than the conventional device in which the setting state cannot be discriminated at all even when the adjusting device is visually observed.

[Brief description of drawings]

1 is a side view of an embodiment of the present invention, FIG. 2 is a top view of a set position setting plate of a handle in the same embodiment, and FIG. 3 is a side view of a conventional friction roller type sheet feeding mechanism. 1 ... drive roller, 2 ... tension spring, 3 ... lever,
4 ... Pressure roller, 5 ... Paper, 6 ... Carriage, 7
…… Writing instrument, 8 …… Guide rail, 10 …… Bracket,
11 …… Spring lever, 12 …… Eccentric roller, 13 …… Handle, 15 …… Set position setting plate, 16 …… Notch.

Claims (1)

(57) [Scope of utility model registration request] 1. A sheet is sandwiched between a driving roller and a pressure roller facing the sheet and is fed in the front-rear direction, and a carriage is reciprocated on a guide rail in the left-right direction with respect to the sheet.
In a friction roller type automatic drafting machine that draws on the paper by driving a writing instrument carried on the carriage in the vertical direction, the pressing force for adjusting the pressing force of the pressure roller against the drive roller. The adjusting means is connected to the pressure roller so that the force for sandwiching the paper by the pressure roller can be arbitrarily set according to the property of the paper, and the pressing force adjusting means is attached to the one end of the pressure roller. A lever, a spring lever rotatably attached to the bracket, a tension spring that connects the spring lever and the lever, an eccentric roller that changes the vertical position of the spring lever, and a handle that operates the eccentric roller. And a set position setting plate having a plurality of notches capable of locking the end of the handle. Paper feed mechanism of dynamic drafting machine.