JPH028778Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention is a printing paper position adjustment device that allows manual fine adjustment of the position of printing paper wound around a platen in typewriters and various printers. Regarding. (B) Prior art In general, when printing devices, especially printers, use continuous paper, the position of the paper is not a problem because they use a tractor to feed it, but typewriters and various printers use cut paper. When using this method, there is a drawback that the position of the cut sheet may shift due to various reasons when the cut sheet is transferred as the platen rotates. Here, in conventional printing devices, a gear for manual fine adjustment is provided in advance, and the connection between the platen and the drive motor is connected or disconnected by the gear to perform fine adjustment, or the drive motor for paper feeding is rotated. A method has been adopted in which the holding torque of the platen is limited and finely adjusted by reducing the current flowing through the drive motor during periods when the drive motor is not in use. Furthermore, when the motor for driving the printing paper stops,
Mechanical vibrations and shocks often caused the printing paper to shift. (c) Purpose of the invention The present invention aims to provide a new printing device that can finely adjust the positional deviation when feeding printing paper in typewriters, printers, etc., and can accurately set the position of printing paper. purpose. (d) Structure of the invention The present invention includes a rotation-holding motor coupled to a platen, a motor drive circuit for holding the rotation-holding motor in rotation, and a motor drive circuit connected to the input side of the motor drive circuit to control the rotational speed of the motor. , a control circuit that supplies a control signal for controlling the holding current, a detection circuit whose output side is connected to the control circuit, and a detection circuit that is attached to a rotation knob coupled to the rotation axis of the platen and connected to the detection circuit. It is equipped with a touch switch means and a printing paper pressing roller that presses the printing paper against the platen, and when an operator contacts the touch switch means, the holding current of the rotation holding motor is controlled, and fine adjustment rotation is possible using the rotation knob. The configuration is as follows. (E) Embodiment The present invention will be described with reference to the drawings. In the drawings, 1 is a printing paper, 2 is a platen, 3 is a pulley for driving the platen, 4 is a rotating shaft of the platen, 5 is a motor for holding rotation, and 6 is a motor for holding rotation. A transmission pulley, 7 is a motor drive circuit, 8 is a control circuit including a microprocessor 9, 10 is connected to a touch switch 11,
A detection circuit receives a detection signal from the touch switch 11 and outputs a detection output to the control circuit 8 in response to the detection signal; 12 is a rotary knob for manually rotating the platen 2; 13 is a printing press roller; show. Next, to explain the operation of the device of the present invention, the operator presses the rotary knob 1 provided coaxially on the platen 2.
Touch the touch switch 11 on 2, that is, the detection circuit 1
A detection signal is added to 0 based on the change in capacitance or resistance from the touch switch 11, and the detection circuit 1
Since a detection output is obtained from 0, the detection output is applied to the control circuit 8 . Accordingly, the microprocessor 9 in the control circuit 8 determines the detection output, and the control circuit 8 generates a control signal corresponding to the state in which the touch switch 11 is touched by the operator. The control signal stops the rotation of the drive motor 5, reduces the current flowing through the drive motor 5, and reduces the holding torque. Therefore, by rotating the rotary knob 12, the operator can rotate the platen 2 and move the printing paper to a desired position, that is, finely adjust the position. On the other hand, when the operator releases his hand from the rotary knob 12, a detection signal corresponding to the increase in capacitance or resistance in the touch switch 11 is applied to the detection circuit 10 in response to this, and the detection output of the detection circuit 10 causes A control signal for increasing the drive current is obtained from the control circuit 8 to the drive circuit 7 , and in response to this, the drive motor 5 recovers the holding torque, and the rotation of the platen 2 is held fixed. Note that when printing paper is automatically fed during printing work, the pulley 6 rotates in the direction A due to the rotation of the drive motor 5, and the platen 2 is rotated accordingly.
is rotated in the B direction by the rotation of the pulley 3 in the B direction, and the printing paper 1 is sent upward. In the above description, the printing paper 1 is wound around the platen 2, and the printing paper pressing roller 13 and the platen 2
is held by. As described above, according to the configuration of the printing paper position adjustment device of the present invention, it is sufficient to simply provide a touch switch on the rotary knob, connect a detection circuit to the touch switch, and connect the output side to the control circuit. . (f) Effects of the invention According to the printing paper position adjustment device of the invention, as mentioned above, it has an extremely simple configuration, and the holding current of the drive motor can be adjusted immediately by touching the rotary knob as required by the operator. The operator can move the printing paper to the desired position by rotating the rotary knob.
Fine adjustment is possible.

[Brief explanation of the drawing]

The drawing is a block diagram showing a printing paper position adjustment device according to the present invention. Explanation of the main drawing numbers, 1... Print paper, 2... Platen, 3... Platen drive pulley, 4... Platen rotation axis, 5... Rotation holding motor, 6...
...drive pulley, 7 ...motor drive circuit, 8 ...
...Control circuit, 10 ...Detection circuit, 11...Touch switch, 12...Rotary knob.

Claims (1)

[Scope of utility model registration request] A rotation holding motor coupled to the platen, a motor drive circuit for holding the rotation holding motor in rotation, and a control signal connected to the input side of the motor drive circuit to control the rotation speed and holding current of the motor. a detection circuit whose output side is connected to the control circuit; touch switch means attached to a rotary knob coupled to the rotation shaft of the platen and connected to the detection circuit; The printing paper is characterized in that the printing paper is provided with a printing paper pressing roller that presses the touch switch means, and when an operator contacts the touch switch means, the holding current of the rotation holding motor is controlled, and the printing paper is made finely rotatable by the rotation knob. Position adjustment device.