JPS62297167A - Carriage driver - Google Patents

Abstract

PURPOSE:To automatically adjust the tension on a belt and restrain backlash, by providing a timing belt and a driving wire with appropriate tensions by a spring provided for a guide pulley, and biasing a driving pulley to a pulley on the prime mover side through the tensions. CONSTITUTION:A guide pulley 5 is constantly biased in the direction of an arrow D by the fore of a coil spring 16. Therefore, an appropriate tension is provided on a timing belt by the biasing force, and a driving pulley 4 and a driving gear 6 are also biased in the direction of the arrow D through the timing belt 3, whereby the driving gear 6 is engaged, under pressure, with a gear 8 on the motor side. By this, a play due to backlash between the driving gear 6 and the gear 8 is restrained. In addition, since the timing belt 3 is also provided with an appropriate tension, slipping between the pulleys 4 and 5 is also restrained.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a carriage drive device, and more specifically, to a timing belt or the like that drives a carriage of a recording device or the like. The present invention relates to a carriage drive device in which backlash between drive gears is suppressed by a tension adjustment device.

[Conventional technology]

Conventionally, this type of carriage drive device generally has:

Timing belts are often used, but backlash tends to occur between the timing belt and the belt drive pulley and between the drive gears in such devices, and backlash can make the position of the carriage unstable and hinder recording operations. This problem, which has a subtle impact on This can cause noise and damage, and sometimes the gears may stop working or the mesh may become misaligned by one tooth.

Regarding the various adjustments that have been made in the past, for example, to adjust the tension of the belt, a pulley for tension adjustment is provided between the drive pulley and the guide pulley.
Measures have been taken such as moving the position of the guide pulley or making it possible to adjust the length of the belt itself.

In order to prevent backlash, measures have been taken such as inserting silicone paper or aluminum foil between the gears and adjusting the distance between the axes of the gears.

However, such a conventional adjustment mechanism tends to have a complicated structure, is expensive, and is difficult to adjust, so it is not very effective.

[Problem that the invention seeks to solve]

In view of the above-mentioned problems, an object of the present invention is to provide an extremely simple structure, a small number of parts for adjustment, a low cost, and the ability to automatically adjust belt tension and suppress backlash. The object of the present invention is to provide a carriage driving device.

[Means for solving problems]

In order to achieve such an object, the present invention provides that both ends of a belt stretched between a drive pulley and a guide pulley are fixed to a carriage, and a gear coaxial with the drive pulley is driven by a gear of a prime mover. In a carriage drive device configured to move a belt, first and second support members each swingably supporting a drive pulley and a guide pulley, and a first support member and a second support member are provided in association with the second support member to apply tension to the belt. The belt has an elastic member, and the gear coaxial with the drive pulley is biased toward the gear of the prime mover via the first support member by the tension applied to the belt.

(Function) In the carriage drive device of the present invention, the tension of the timing belt is adjusted by the spring force acting on the support plate of the guide pulley, and the tension applied to the timing belt is used to drive the drive pulley and the same axis. By biasing the gear or the gear on the motor side with which it meshes, pack lash therebetween is suppressed.

(Examples) Examples of the present invention will be described below in detail and specifically based on the drawings.

FIG. 1 shows an embodiment of the invention. Here, 1 is a carriage on which a recording head 2 is mounted, and 3 is a timing belt which has a tooth profile on its inside and is stretched between a drive pulley 4 and a guide pulley 5, both of which have the same tooth profile. Both ends of the belt 3 are fixed to a fixed portion 3A of the carriage 1.

6 is a pulley drive gear provided coaxially with the drive pulley 4 on the rotating shaft 7, and 8 is a gear that meshes with the drive gear 6 and is driven by a motor (not shown).

Here, the rotation shafts 7 of the drive pulley 4 and the drive gear 6 are attached to a support member 9, and the support member 9 is rotatably supported around a support shaft 11 attached to a frame 10, and the guide pulley The drive gear 6 is biased toward the gear 8 on the motor side by the spring force of the spring on the 5 side, which will be described later. 9A is a sliding groove provided in the support member 9, and 12 is a pin fixed to the frame 10 and fitted into the sliding groove 9A to swingably hold the support member 9.

13 is a second pulley support member to which the rotation shaft 14 of the guide pulley 5 is attached; the support member 13 is swingably supported by the support shaft 15; 5 is given a biasing force in the direction of the arrow. 13A is a sliding groove, and 17 is a presser pin that is fitted into the sliding groove 13A and holds the support member 13 in a swingable manner.

To explain the operation of the carriage drive device configured in this way, since the guide pulley 5 is always biased in the D direction by the spring force of the coil spring 16, the timing belt 3 is applied with appropriate tension due to the bias force. At the same time, the drive pulley 4 and the drive gear 6 are also biased in the D direction via the timing belt 3, and the drive gear 6 is pressed and meshed with the gear 8 on the motor side. Therefore, this suppresses the play due to backlash between the drive gear 6 and the gear 8, and since the timing belt 3 is appropriately tensioned, the tension between it and the pulleys 4 and 5 is suppressed. Slippage is also suppressed.

Note that although the above explanation has been given regarding an example in which the carriage is driven by a timing belt, the application of the present invention is not limited to such a timing belt.
It goes without saying that similar effects can be obtained even in the case of wire drive.

〔Effect of the invention〕

As described above, according to the present invention, the spring force of the spring provided in connection with the guide pulley is used to maintain an appropriate tension in the timing belt and the drive wire, and the drive pulley is controlled through the tension. Since it is biased to the pulley on the prime mover side, the tension of the belt etc. can be automatically adjusted, and backlash in the drive gear can be suppressed, making it possible to always move the carriage to the correct position. It became.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an example of the configuration of a carriage driving device according to the present invention. DESCRIPTION OF SYMBOLS 1... Carriage, 3... Timing belt, 4... Drive pulley, 5... Guide pulley, 6... Drive gear, 8... Gear, 9.13... Support member, 11 .15...Support shaft, 16...Coil spring.

Claims (1)

[Claims] Both ends of a belt stretched between a drive pulley and a guide pulley are fixed to a carriage, and the carriage is moved by driving a gear coaxial with the drive pulley by a gear of a prime mover. A carriage drive device comprising: first and second support members that swingably support the drive pulley and the guide pulley, respectively; and an elastic member that is provided in association with the second support member and applies tension to the belt. a carriage drive device, comprising: a gear coaxial with the drive pulley toward a gear of the prime mover via the first support member due to tension applied to the belt; .