JPH039870A - Serial printer - Google Patents

Abstract

PURPOSE:To reduce the noise due to spacing operation by forming the drive pulley fixed on the shaft of a stepping motor into a multilayer structure and using a damping material therein. CONSTITUTION:When a stepping motor 7 is rotated in a certain direction, a timing belt 6 is rotated in a definite direction. At this time, the carrier unit 3 fixed to the timing belt 6 also moves in the definite direction. Therefore, the carrier unit 3 reciprocally moves left and right by forwardly and reversely rotating the stepping motor 7. Herein, a drive pulley 8 is constituted so that an inner case 8a is fixed to the motor shaft 7a of the stepping motor 7 in a pressure contact state and an outer case 8c having a tooth form 8d of the timing belt 6 on the outer periphery part thereof is integrally fixed to the outside of the inner case 8a through a damping material 8b without being brought into direct contact with the inner case. Therefore, noise can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a serial printer device used as an output device of an information processing device, and particularly to a serial printer device with an improved spacing power transmission structure.

[Conventional technology]

Conventionally, the spacing power transmission structure used in serial printer devices consists of a stepping motor, a drive pulley integrally made of a rigid body press-fitted onto the motor shaft, and a timing belt stretched between this pulley and a tension pulley. A part of the timing belt was fixed to the carrier unit as a power transmission means.

[Problem to be solved by the invention]

In the above-mentioned conventional structure in which the drive pulley, which is integrally constructed of a rigid body, is fixed to the stepping motor shaft by pressing or screwing, vibrations generated by the rotation of the stepping motor are transmitted to the timing belt. This has the disadvantage that the timing belt resonates, or in extreme cases, the printer frame resonates, which becomes a source of noise other than printing noise.

[Means to solve the problem]

The serial printer device of the present invention includes a stepping motor as a spacing power source, a drive pulley fixed on the motor shaft, and a tension pulley provided to correspond to the drive pulley. an inner case of a drive pulley, the inner case of the drive pulley being fixed on the stepping motor shaft; An outer case having a belt tooth profile on its circumference, over which the timing belt is stretched, is a rigid body, and the outer periphery of the inner case and the inner surface of the outer case are made of vibration isolating material (vibration isolating rubber) or damping material (such as Hanenite) or The inner case and outer case are fixed and held together by integrally forming a honeycomb-shaped aluminum member or a foamed aluminum member.

〔Example〕

FIG. 1 shows a configuration diagram of an embodiment of the present invention, and A-
A sectional view taken along arrow B is shown in FIG.

First, the configuration of the serial printer shown in FIG. 1 will be explained. Platen 1. The guide shaft 4゜5, the stepping motor 7, and the tension pulley 9 are fixed to a side frame (not shown), and the carrier unit 3 on which the print head 2 is mounted is mounted on the guide shafts 4 and 5, parallel to the platen 1 on the left and right sides. It is held so that it can be moved by sliding. Further, the timing belt 6 is connected to a stepping motor 7.
A part of the timing belt 6 is fixed to the carrier unit 3. Here, the drive pulley 8 has an inner case 8a fixed to the motor shaft 7a of the stepping motor 7 under pressure, and a timing belt tooth profile 8d on the outer periphery of the inner case 8a.
The outer case 8c having the outer case 8c is integrally fixed to the inner case via a vibration isolating material or damping material 8b without being directly attached to the inner case.

Next, the operation will be described. First, when the stepping motor 7 rotates in the same direction, the timing belt 6 rotates in a fixed direction. At this time, the carrier unit 3 fixed to the timing belt 6 also moves in a certain direction. Therefore, by rotating the stepping motor 7 in forward and reverse directions, the carrier unit 3 reciprocates from side to side.

FIG. 3 shows another embodiment of the invention, in which member 8b of FIG.
The embodiment is the same as the embodiment shown in FIGS. 1 and 2 except that a honeycomb-shaped aluminum member or a foamed aluminum member 8e is used instead.

[One effect of the invention]

As explained above, the present invention provides a multilayer structure for the drive pulley fixed on the stepping motor shaft, and uses a vibration isolating material or damping material, a honeycomb-shaped aluminum member, or a foamed aluminum member inside. Since it is possible to prevent or reduce the transmission of vibrations generated during rotation to the timing belt, there is an effect of reducing noise accompanying the spacing operation.

[Brief explanation of drawings]

1 and 2 are a perspective view and a partial sectional view of one embodiment of the invention, and FIG. 3 is a partial sectional view of another embodiment of the invention. 1...Platen, 2...Print spatula F13...Carrier uniform, 4, 5...
・・Guide shaft, 6・・・Timing belt, 7・・・Steer, ping motor, 7a・・・・
・Motor shaft, 8...Drive pulley, 8a...
...Inner case, 8b... River/vibration isolating material (or damping material), 8c... Outer case, 8d...
...Belt tooth profile, 8e, old...Honeycomb-shaped aluminum member (or foamed aluminum member), 9...Tension pulley.

Claims (1)

[Claims] This is a serial printer in which the print head is mounted on a carrier and prints while reciprocating along the printing surface.The power source for the reciprocating motion is a stepping motor, and the power transmission means is a pulley fixed on the stepping motor shaft. a tension pulley provided outside the movement range of the carrier to correspond to the pulley; and the pulley.
In a power transmission structure in which a timing belt is passed around a tension pulley in a closed loop, and a part of this timing belt is fixed to a carrier frame, the pulley fixed on the stepping motor shaft is connected to the motor shaft. An inner case fixed to the top and an outer case having belt teeth on the circumference over which the timing belt is stretched are made of rigid bodies (aluminum, iron, brass, sintered alloy, etc.), and the outer periphery of the inner case and the outer case are The inner surface of the case is integrally formed with a vibration-proofing material (vibration-proofing rubber, etc.) or vibration-damping material (hanenite, etc.) or a honeycomb-shaped aluminum member or foamed aluminum member, and the inner case and outer case are fixed and held. serial printer device.