JPS5857982A - Motor-operated typewriter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric typewriter equipped with a cylindrical platen whose rotation in the circumferential direction is driven by a motor.
The purpose is to improve operability when changing paper.

Figure 1 shows a cylindrical platen (1), (2) is the upper paper presser, (3) is the lower paper presser, (4) is the upper paper presser release lever, and <S> is the set paper. . When it becomes necessary to load or remove the paper (6) in an electric typewriter equipped with such a platen (1), the platen (1) is not necessarily in a position where the paper (5) can be easily attached or removed. is not limited. Therefore, conventionally, the operator moves the platen (1) in the axial direction [in the direction of arrow A] and in the circumferential direction [in the direction of arrow B] to bring it to a position where the paper (6) can be easily attached and detached. (5) must be attached and detached.At this time, if the paper (6) is attached to or removed from the platen (1), the platen (1)
The platen (1) must be rotated circumferentially by hand, but the holding torque of the motor that drives the rotation in the circumferential direction is generated in the platen (1), and when the motor is energized, the platen (1) cannot be rotated. It cannot be rotated by hand. Therefore lI! to said motor! Turn off the power and turn off the holding torque, then rotate it freely into position by hand.
After completing the attachment and detachment of the paper (6), it is necessary to perform a series of operations such as returning the motor to the energized state again in preparation for the next printing.

Therefore, the present invention provides a control device that automatically rotates the platen to a predetermined position and automatically turns off the holding torque in the direction of the platen station when a paper replacement instruction is detected. One embodiment of the present invention, which has improved operability, will be described below with reference to FIG.

Figure 2 is a control circuit diagram of an electric typewriter, in which (6) is the first motor that drives the rotation of the platen (1) in the circumferential direction;
(7) is a second motor that drives the movement of the platen (1) in the axial direction, and (8) is the control device main body, which uses a microcomputer as its main part to drive the motor (control circuit) according to printing operations and line feeding operations. (9) and the first through the motor driver wheel or the motor control circuit and the motor driver υ
The motor (6) or the second motor (7) is driven to execute line feed and print feed.

O is a first position sensor that detects that the platen (1) is at a predetermined rotational position in the direction;
A second position sensor detects that the motor (6) is at a predetermined position within the axial movement range;
) is a switch circuit inserted in series with the power supply circuit, and consists of, for example, a transistor switch.

(to) is a timer circuit which is instructed to start timing by the control device main body (8), and this output switches on/off of the switch circuit (6) via a switch control circuit.

Next, the function of the control device main body (8) will be explained based on the operation.

When the controller detects that the paper exchange instruction button (not shown) has been operated, the first and second motors (6) (
7) Niyotte 1st. When the second position sensor o3Q41 drives the platen (1) to the detection position and detects that the first position sensor (to) has issued a circumferential positioning completion signal, the control device main body (8) Trigger the timer circuit. The timer circuit (2) is to provide a time delay until the inertia of the platen (1) in the local direction becomes zero after it has rotated to a predetermined position.When the timer circuit (to) detects that the predetermined time has elapsed, The switch circuit (6) is turned off, the power to the first motor (6) is turned off, the holding torque in the circumferential direction of the platen (11) is turned off, and the platen (1) can be rotated freely by hand. state.

When this state is reached, the operator performs the paper loading/unloading itself.The switch circuit (to), once in the OFF state, can then be used for key operations such as line spacing or printing operations. The control device body (8) is kept in the off state until it detects that the control device body (8) wil or is given an instruction that the platen (1) needs to be driven by the second motor (6) (7). When the switch circuit (2) is detected, the switch circuit (2)
is returned to the on state, and the instructed operation is executed while the circumferential direction of the platen (1) is locked.

With this configuration, the platen (1) can be connected to the first and second position sensors (
To) Move the platen (1) in the circumferential direction and axial direction to a position where the paper (5) can be easily attached and detached as specified in (Foundation), and at that position, the platen (1) can be rotated manually. . Furthermore, if the platen (1) is allowed to move freely in the circumferential direction immediately after completion of driving, the platen (1) may shift from a predetermined position in the circumferential direction due to inertia during rotation in the circumferential direction. However, in the above embodiment, the timer circuit Since the holding torque is released after the inertia in the local direction becomes zero depending on the side, the stopping position of the platen (1) can be accurately set to the position defined by the first position sensor (2). In addition, after the paper (f+) is attached or detached, normal line feeding or printing operations can be performed without having to take the trouble to restore power to the first motor (6) and lock the platen (1) as in the conventional case. By doing this, the switch circuit side is turned on and automatically locked.

As explained above, according to the electric typewriter of the present invention,
When a paper replacement instruction is detected, the platen is rotated by a motor to a predetermined paper replacement position, and the holding torque of the motor is then turned off at a predetermined timing.A control device is provided, so that the platen can be easily moved to a predetermined position when replacing paper. paper can be brought to the paper exchange position, and there is no need to perform a switch operation to turn off the power to the motor in order to turn off the holding torque in the station direction. The properties can be significantly improved and improved.

[Brief explanation of drawings]

FIG. 1 is an external perspective view of a conventional platen, and FIG. 2 is a structural diagram of an embodiment of an electric typewriter according to the present invention. (1)... platen, (6)... first motor, (
8)...control device main body, (to)...first position sensor, μs...switch circuit, -...timer circuit representative Yoshihiro Morimoto Figure 2

Claims (1)

[Claims] l. It has a cylindrical shape and its rotation in the circumferential direction is controlled by a motor.
In an electric typewriter with a moving platen,
An electric typewriter provided with a control device that rotates the platen to a predetermined paper exchange position by the motor when a paper exchange instruction is detected, and turns off the holding torque of the motor at a subsequent predetermined tie ring.