JPS61255879A - Carrier-driving device for serial printer - Google Patents

Abstract

PURPOSE:To facilitate the adjustment to a stretch of spring material and to prevent the positional deviation of a carrier by making a supporting member to provide the spring material with tensile strength to offset a force of the spring and by fixing the supporting member with a tightening screw. CONSTITUTION:When a tightening screw 17 is loosen, a supporting member 10 pivots by a force of a spring 14, and it provides a belt 7 with an appropriate tensile strength to offset the force of the spring 14. When the tightening screw 17 is tightened to fix the supporting member 10, regardless of reciprocating movement of a carrier 1 by normal or reversed rotation of a motor 8, the supporting member 10 never pivots to stretch and shrink the belt 7. Therefore, as long as a step count to drive the motor 10 is set and the carrier 1 is moved accordingly, the position of the carrier 1 never changes because of a difference in forward or backward movement. Only to free the tightening screw 17 again from tightness is enough to provide the belt 7 with a tensile strength, and thus, the operation is quite easy.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a carrier drive device for a serial printer.

Conventional technology Conventionally, a strip material such as a belt or wire, which is partially held in a carrier, is wound around multiple pulleys arranged on the left and right, one pulley is connected to a motor, and the other pulley is used as a support member to freely rotate. There is a carrier that is supported by a carrier and driven by a motor to move the carrier by the tensile force of the strip.

If the strip material stretches due to long-term use, the amount of feed of the carrier will be inconsistent. In order to prevent this, there is a conventional example in which a support member supporting the driven pulley is held movably and the support member is fixed at an arbitrary position with a screw.

Another conventional example is one in which the support member that supports the driven pulley is biased by a spring to prevent the strip from loosening.

Problems to be Solved by the Invention Among the conventional examples described above, in the former, the screw must be tightened while measuring the tension of the strip, making adjustment work cumbersome.

In the latter case, when the direction of movement of the carrier changes, the amount of deflection of the spring changes, and the position of the carrier differs between the forward and return trips.
Misalignment occurs in the printing position or erasing position.

This invention was made in view of the above points, and it facilitates the adjustment work for the elongation of the strip material.

The purpose of this invention is to develop a carrier drive device for a serial printer that can prevent the carrier from being misaligned.

Means for Solving the Problems This invention provides a means for moving the strip 7 held on the carrier 1 to the pulley 9.
, 11, connect the pulley 9 to the motor 8, and connect the pulley 9 to the motor 8.
11 is supported on a support member 10, this support member 10 is displaceably attached to a frame 13, and the support member 10 is attached to a spring 14.
A tightening screw 17 is provided to tighten the supporting member 10 to the frame 13 at an arbitrary position.

When the working strip 7 is stretched, loosening the tightening screw 17 displaces the support member 10 and applies tension to the strip 7.

When the tightening screw 17 is tightened, the support member 10 is fixed. Therefore, even if the direction of movement of the carrier 1 changes, the strip 7 does not expand or contract, thereby preventing the carrier 1 from being misaligned.

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

1 is a carrier, and the carrier 1 holds a print head 2 and a ribbon cassette 3. The carrier 1 is slidably held by a carrier shaft 5 parallel to the platen 4 and a guide 6. A belt 7, which is a strip member partially held by the carrier 1, is wound around a pulley 9 directly connected to a motor 8 and a pulley 11 supported by a support member 10. The support member 10 is rotatably held by a frame 13 by a shaft 12, and is biased by a spring 14. Further, an arc-shaped elongated hole 15 whose radius is centered around the shaft 12 is formed in the support member 10, and a tightening screw 17 is provided which is inserted into the elongated hole 15 and screwed into the projection piece 16 of the frame 13. ing.

In such a configuration, when the tightening screw 17 is loosened, the support member 10 is rotated by the force of the spring 14, and the spring 14 is rotated by the force of the spring 14.
To give the belt 7 just the right amount of tension by balancing it with the force. When tightening the tightening screw 17, when the support member 10 is fixed, even if the motor 8 is rotated in both forward and reverse directions and the carrier 1 is reciprocated, the support member 1o will rotate and the belt 7 will not expand or contract. do not have. Therefore, as long as the number of steps for driving the motor 8 is determined and the carrier 1 is moved, the position of the carrier 1 will not change due to the difference between the outward and return trips. The tightening screw 17 also performs the work of applying tension to the belt 7.
It is extremely easy to operate, just loosen and retighten.

Effects of the Invention Since the present invention is configured as described above, the support member balances the spring force and applies an appropriate amount of tension to the strip material, and the support member is fixed with the tightening screw, thereby preventing the movement of the carrier. Even if the direction changes, the carrier can be accurately positioned by preventing the strip from expanding or contracting.Also, adjusting the tension on the strip can be done extremely easily by simply retightening the tightening screw. It has the effect of being able to.

[Brief explanation of the drawing]

The drawing is a perspective view showing an embodiment of the invention.

Claims (1)

[Claims] A plurality of pulleys for winding a strip partially held by a carrier are arranged at intervals in the moving direction of the carrier, one of the pulleys is connected to a motor and the other pulley is supported by a support member, This supporting member is attached to a frame so as to be freely displaceable along the moving direction of the carrier, and the supporting member is biased by a spring in a direction in which the distance between the pulleys is widened, and the supporting member is fastened to the frame at an arbitrary position. A carrier drive device for a serial printer, characterized by being provided with a tightening screw.