JP2508316Y2 - Roll paper take-up device for paper-driven automatic drafting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a roll paper winding device in a paper driven automatic drafting machine.

[Conventional technology]

In this type of paper drive type automatic drafting machine, when one drawing is completed, the roll paper slackened under the platen is driven by the motor and the winding shaft is rotated to drive the motor until the slack of the roll paper disappears. Then, the roll paper is wound around the winding shaft.

[Problems to be solved by the invention]

When one drawing is completed and the slack portion of the roll paper is wound by the winding shaft, the winding motor is driven for a sufficient winding time. In this case, since the diameter of the roll paper wound on the winding shaft is different, it is difficult to control the winding of the roll paper by driving the motor for one drawing, and drive the winding motor more than necessary. Therefore, there is a defect that the winding process time becomes long.

The present invention aims to eliminate the above defects.

[Means for solving problems]

In order to achieve the above object, the present invention sandwiches the roll paper on the platen 2 between the drive roller 6 and the pressing roller 8, and rotates the drive roller 6 to feed the roll paper on the platen 2 in the front-back direction. , The writing instrument 10 is moved in a direction traversing the platen 2 to draw an image on the roll paper on the platen 2, and after the drawing is completed, the roll paper loosened below the platen 2 is driven by a motor 18 to wind a roll. In the apparatus wound around 16, the platen 2 is provided with a sheet tension detecting means, and the motor is stopped based on the tension detection output of the sheet tension detecting means.

[Action]

When winding the slackened roll paper below the platen 2 after completion of one drawing, the motor 18 is driven and the roll paper is sequentially wound around the winding shaft 16. When the slack of the roll paper below the platen 2 is removed and a tension is generated in the roll paper, this tension causes the roll paper to press the platen surface and activate the paper tension detecting means. When the paper tension detecting means operates, the drive of the motor 16 is stopped based on the output signal.

〔Example〕

Hereinafter, the configuration of the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings.

Reference numeral 2 denotes a platen fixed to a main body (not shown) of a paper-driven automatic drafting machine, and a drawing roller 4 is rotatably arranged in a groove formed in the width direction of the platen, and the groove is adjacent to the groove. A drive roller 6 is rotatably disposed in the drive roller.
The rollers 4 and 6 are rotatably supported by a bracket fixed to the main body, and the rollers 4 and 6 are linked to a rotation drive device so as to rotate in the same direction in cooperation with each other. 8
Is a pressing roller, which is in pressure contact with the drive roller 6. A Y-rail (not shown) is fixed between both sides of the main body in a direction crossing the platen 2, and a pen head (not shown) is movably attached along the Y-rail.
A writing instrument 10 is supported by the. A roll paper holder 12 is rotatably supported by the main body and located below the rear end of the platen 2, and a roll paper 14 is held on the holder. Reference numeral 16 denotes a winding shaft which is rotatably supported by the main body and is located below the front end of the platen 2, and the roll paper 14 is wound around the shaft 16. The winding shaft 16 is connected to an output shaft of a winding motor 18 fixed to the main body. Reference numeral 20 denotes a strip plate-shaped platen cover, the upper end of which is pivotally supported 22 at a position where the front end of the platen 2 is separated from the platen 2 by a predetermined distance, and the rear surface of the open side is a predetermined amount from the surface of the platen 2 by a spring 24 force. It is held in an isolated position. A mechanical sensor 26 such as a limit switch is provided at a proper position near the front end of the platen 2, and the sensor 26 faces the back surface of the platen cover 20. The platen cover 20 and the mechanical sensor 26
Constitutes a paper tension detecting means.

 Next, the operation of this embodiment will be described.

The controller rotationally controls the X motor that rotates the drive roller 6 in the forward and reverse directions to feed the roll paper 14 on the platen 2 in the left-right direction, that is, the front-back direction of the main body, while the pen head moves the roll paper 14 in FIG. While rotating the Y motor that feeds along the Y rail in the direction that traverses, the writing tool 10 held by the pen head is brought into contact with and separated from the roll paper 14 on the platen 2, and drawing is performed within a predetermined range on the roll paper 14. To do. After the completion of one drawing, the roll paper 14 is sent by the drive roller 6 to loosen the roll paper 14 in the front part of the platen 2 according to the winding amount. After drawing, when winding the roll paper 14 around the winding shaft 16, the motor 18 is driven to move the winding shaft 16 into the winding shaft 16 in FIG.
Rotate counterclockwise. When the roll paper 14 is taken up by the take-up shaft 16 and tension is generated in the roll paper 14 between the take-up shaft 16 and the drive roller 6, as shown in FIG. Is pressed by the tension of (2) to swing counterclockwise in the figure around the pivot point 22 thereof, and the mechanical switch 26 is turned on by the back surface of the platen cover 20. When the mechanical switch 26 is turned on, the controller stops driving the motor 18. As a result, a predetermined amount of roll paper 14 is wound around the winding shaft 16.

〔effect〕

Since the present invention is configured as described above, it is not necessary to drive the take-up shaft more than the required time, so that the take-up work can be performed quickly and the drive time of the take-up shaft can be adjusted to the roll paper take-up amount. Since it is not necessary to control the motor by simply turning it on and off, the motor can be easily controlled.

[Brief description of drawings]

FIG. 1 is an external view, FIG. 2 is a side view, and FIG. 3 is a side view. 2 ... Platen, 4 ... Drawing roller, 6 ... Drive roller, 8 ... Press roller, 10 ... Writing tool, 12 ... Roll paper holder, 14 ... Roll paper, 16 ... Winding shaft, 18 ... …
Motor, 20 ... Platen cover, 22 ... Pivot support, 24 ... Spring, 26 ... Mechanical sensor.

Claims (1)

(57) [Scope of utility model registration request] 1. A roll paper on a platen 2 is sandwiched between a drive roller 6 and a pressing roller 8, and the roll paper is fed in the front-back direction on the platen 2 by the rotation of the drive roller 6, while the writing instrument 10 is moved to the platen. 2 rolls the roll paper on the platen 2 and draws the roll paper loosened below the platen 2 on the winding shaft 16 driven by the motor 18 after the drawing. In the apparatus described above, the platen 2 is provided with a paper tension detecting means, and the motor is stopped based on the tension detection output of the paper tension detecting means. apparatus.