JPS60161172A - Printing line position adjustor - Google Patents

Abstract

PURPOSE:To enable a printing line position to be accurately positioned with a simple construction, by a method wherein a motor frame is turned around the axis of a platen together with a platen motor by a position-adjusting motor, and the platen itself is arbitrarily rotated. CONSTITUTION:A switch 16 is turned ON, and rotation of the platen motor 10 is transmitted through gears 9, 8 to intermittently rotate the platen 6, thereby feeding a paper at as fixed pitch. In starting printing, when the printing line on the paper is staggered relatively to the tip of a printing head 3, the platen motor 10 is stopped, the back lash between the gears 8, 9 is fixed by meshing a detent 11 with the gear 8, and a switch 17 is turned ON to drive the position-adjusting motor 15, thereby turning the motor frame 7 a predetermined angle together with the platen 6. Thereafter, the printing line position can be accurately adjusted without need for manual operation. Accordingly, it is unnecessary to provide clutches in a power transmitting path for the platen and the motor frame, and the construction can be simplified.

Description

TECHNICAL FIELD OF THE INVENTION This invention relates to a print line position adjustment device of the type that feeds paper using a platen.

Technical Background of the Invention and Problems Therein In an apparatus in which a platen motor rotates a sieve platen to feed paper, the position of the line to be printed on the paper may be misaligned with respect to the print head. In this case, there is a device in which a clutch provided between the platen and the platen motor is disengaged and the platen is manually rotated. However, manually rotating the platen is troublesome;
Furthermore, since a clutch is present, the power transmission structure has the disadvantage of becoming complicated.

In addition, a step motor is used as the platen motor, and the rotation of the platen motor is decelerated and transmitted to the platen, and the platen is rotated in 1/48 inch or 1/6 o inch increments according to the circumferential length. Some devices have also been devised in which the position of the device can be adjusted. On the other hand, since there is bank lash in the gear group that transmits rotation from the platen motor to the platen, the detent is meshed with the gear directly connected to the platen. (Gears are extremely difficult to manufacture), and in practice it is impossible to accurately adjust the row position due to the effects of bancranche.

Purpose of the Invention The present invention has been made in view of the above points, and provides a printing line position adjustment that can accurately determine the rotational position of the sieve platen using power, and can further simplify the power transmission path. The purpose is to obtain equipment.

SUMMARY OF THE INVENTION In this invention, a platen motor is fixed to a motor frame rotatably fitted to one end of a shaft of the platen, and normally the platen motor rotates the platen to feed paper, and the position adjustment motor rotates the motor. The frame is rotated along the axis of the platen together with the platen motor, and the platen itself is also rotated by an arbitrary angle, whereby the position in the rotational direction of the platen, that is, the print line position, is accurately determined by the driving force, and further, There is no need for a clutch in the power transmission path for rotating the platen and the motor frame, and therefore the power transmission structure can be simplified.

Examples of the invention An embodiment of this invention will be described based on the drawings.

Main frame T2) having a pair of left and right side plates (1)
A power is provided. A guide (5) for holding a carrier (4) on which a print head (3) is mounted is installed on the side plate (11), and a platen (6) is rotatably held therein.

At the right end of the platen (6) is a motor frame (
The force is rotatably fitted, and the gear (8) is fixedly fitted. A platen motor a1 that drives a gear (9) that meshes with a gear (8) is fixedly attached to this motor frame (7), and is biased counterclockwise in FIG. 1 by a spring (not shown). A detent 0υ is rotatably held by a bin a2. Furthermore, a fan-shaped gear 0th floor whose radius is centered around the axis of the platen (6) is formed on a part of the outer periphery of the motor frame (7), and drives a gear (14) that meshes with this gear (13). A position adjustment motor α9 is fixed to the right side plate (11). Step motors are used for these platen motors 4 and position adjustment motor a9, and each is connected to a switch aeα attached to the main frame (2).
η is connected to the stain source.

In such a configuration, a pinch roller (not shown) is brought into contact with the paper wound around the platen (6), and the rotation of the driven platen motor a is transferred from the gear (9) to the gear (9) by turning on the switch (LET-ON). (Tell 83 and platen (6
), the paper is fed in a constant pinch. When starting printing, if the line to be printed on the paper is misaligned in the paper feed direction with respect to the tip of the print head (3), the platen motor 0ω is stopped and the bank lash between the gears (8) and (9) is removed. With the platen (6) Q movement fixed by the meshing of the gear (8) and the detent 0υ, the position adjustment motor KASUMI is driven by operating the switch η, and this causes the shimo motor frame (
71 is rotated by a predetermined angle together with the platen (6) and gear (8). Even if the pitch of the teeth of the gear aωI is disturbed, the rotation angle of the platen (6) and motor frame (7) can be determined correctly by the rotation angle of the position adjustment motor (151). Therefore, the print line position can be adjusted manually. The rotation transmission can be carried out accurately without relying on it. Since a clutch is not required in the rotation transmission path to the platen (6) and the seven-tar frame (7), the rotation transmission structure can be simplified.

Further, a dial for manually rotating the platen (6) can be omitted, and a simple design can be achieved. Accordingly, there is no need to form a hole in the housing through which the shaft of the platen (6) projects in order to directly connect the platen (6) and the dial, and leakage of printing noise can also be prevented.

Note that the motor frame (7) may be provided with a portion that receives an external force from a cam (not shown) connected to the position adjustment motor l19 since the force does not need to be rotated over a wide range. In order to reduce the load on the adjustment motor (151) and perform fine adjustment, it is preferable to transmit the rotation of the position adjustment motor a9 to the motor frame (7) using a worm mechanism. 6) while directly connected to the motor frame (7).
It may be fixed to

Effects of the Invention Since the present invention is configured as described above, it is possible to adjust the print line position by moving the motor frame together with the platen at any angle using the position adjustment motor without relying on manual operation. , the design can be simplified by omitting the dial on the platen that is exposed to the outside, and the rotation is transmitted to the platen by engaging the detent with the gear on the platen shaft. Furthermore, there is no need to provide a clutch in the power transmission path between the platen and the motor frame, and the power transmission structure can be simplified.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a partially cutaway side view, FIG. 2 is a plan view, and FIG. 3 is a partially perspective view. 2... Main frame, 6... Platen, 7...
Motor frame, 8... Gear, 10... Platen motor, 11... Detent, 15... Position adjustment motor Applicant Tokyo Electric Corporation

Claims (1)

[Scope of Claims] 1. A motor frame is rotatably fitted to one end of a platen rotatably held by a main frame, a platen motor is fixedly attached to the motor frame by being connected to the platen, and the motor frame is fixedly attached to the motor frame. 1. A printing line position adjustment device, characterized in that a position adjustment motor for rotating the motor frame at an arbitrary angle is fixedly attached to a main frame. 2. A motor frame is rotatably fitted to one end of a platen rotatably held by the main frame, a platen motor is connected and fixedly attached to the platen to the motor frame, and the motor frame is attached to the main frame. A position adjusting motor for rotating the grating at any angle is fixedly attached, a gear is internally provided at the end of the grating, and a detent that elastically meshes with the gear is attached to the motor frame. Line position adjustment device.