JPS6135809Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention involves stretching both ends of a belt wound around a drive pulley to the sides of a moving body, and causing the moving body to reciprocate by rotation of the drive pulley. The present invention relates to an improvement of such a reciprocating body drive device.

[Conventional technology]

3 and 4 show a conventional reciprocating body drive device used as a drive device for a serial printer, for example, in which a movable body (for example, a carrier of a serial printer) 1 is mounted on a base 2 in parallel. It is guided by two guide shafts 3, 3 and can reciprocate in the direction of arrow 4, and a stepping motor 5 for reciprocating the movable body 1 is attached to the lower surface of the base 2. A rotating shaft 6 of the motor 5 protrudes toward the upper surface of the base 2, and a driving pulley 7 is attached to the protruding portion of the rotating shaft 6 in close proximity to one side surface 8 (a side surface parallel to the moving direction) of the movable body 1. A belt 9 is wound around the drive pulley 7, and both ends of the belt 9 are screwed (screws 10, 10) to one side of the movable body 1, so that the belt 9 extends almost in a straight line in the direction of movement of the movable body 1. It is stretched so that Therefore, when the motor 5 is rotated, the moving body 1 is rotated as the drive pulley 7 is rotated.
moves back and forth in the direction of arrow 4, but in order to prevent slippage between belt 9 and pulley 7, belt 9 is also screwed to the outer circumferential surface of pulley 7 (screw 11).
has been done.

[Problem that the invention attempts to solve]

However, in such conventional devices, due to expansion and contraction of the belt 9 due to temperature changes, etc., the motor 5
The amount of movement of the moving body 1 with respect to the rotation angle changes.
Therefore, for example, when this device is applied to a carrier drive device of a serial printer, even if the motor 5 is rotated by a certain angle, the amount of movement of the carrier will not be constant, resulting in a decrease in printing accuracy. It is.

The present invention was made to eliminate the drawbacks of the conventional device, and the amount of movement of the movable body 1 does not change due to expansion and contraction of the belt 9 due to temperature changes, etc., and the carrier drive of a serial printer is It is an object of the present invention to provide a reciprocating body drive device with a simple configuration suitable for devices and the like.

[Means for solving problems]

The reciprocating body driving device of the present invention has both ends of a belt fixed to the sides of a movable body that is provided to be able to freely move back and forth, and this belt is wound around a drive pulley so that at least a portion of the belt is directed in the direction of movement of the movable body. The movable body is stretched in a substantially straight line toward the movable body, and a narrow relief recess is provided in the side surface of the movable body where the belt comes into contact with the belt, excluding the area facing the drive pulley. The present invention is characterized in that an elastic member is attached above the escape recess to press the belt from the outside.

[Effect]

With such a configuration, even if the belt expands or contracts due to temperature changes, the expansion or contraction is absorbed by the relief recesses, so the belt does not become sagging. Therefore, the amount of movement of the moving body relative to the rotation angle of the motor is always constant without being affected by the expansion and contraction of the belt.

[Example of idea]

FIG. 1 shows an embodiment of the present invention, in which a movable body 1 is guided by a guide shaft 3 and is provided so as to be movable back and forth in the direction of the arrow 4, similar to that shown in FIGS. 3 and 4. ing. Further, the intermediate portion of the belt 9 is wound around a drive pulley 7 attached to the rotating shaft 6 of the stepping motor, and is fixed with a screw 11 to prevent slippage. Both ends of the belt 9 are attached to one side 8 of the movable body 1 with screws 10,
10, and is stretched so as to be substantially in a straight line in the moving direction of the moving body 1.

A long and narrow recess 12 and a narrow relief recess 1 are provided on the side surface 8 of the movable body 1 in a region where the belt 9 comes into contact with the belt 9.
3 are provided independently. Note that the elongated recess 12 is provided so as to cover the range facing the pulley 7, and the narrow relief recess 13 is provided at a position near one of the screws 10 outside of the range facing the pulley 7. Respective recesses 12,1
3, the belt 9 is made to float above the moving body 1.

Further, in a position near the escape recess 13, one end of an elastic member 14 made of metal, for example, is overlapped with the belt 9 and fastened together with the one screw 10, and this elastic member 1
The other end of the belt 9 presses the belt 9 from the outside on the escape recess 13.

With the above configuration, since the belt 9 is pressed by the elastic member 14 on the escape recess 13, tension is constantly applied thereto. Therefore, due to temperature changes etc., the belt 9
When the belt 9 is stretched, it bends to a greater extent and enters the escape recess 13. Conversely, when the belt 9 contracts, the degree of bending decreases, and in any case, the tension is kept almost constant. Always driven pulley 7
The moving body 1 is moved by a fixed amount with respect to the rotation angle.

Furthermore, even if dirt or the like adheres between the belt 9 and the side surface 8 of the moving body 1, the pulley 7 on the side surface 8
A recess 12 is provided at a portion facing the belt 9, and a gap is formed between the belt 9 and the moving body 1 in this portion, so that the linearity of the belt 9 is not impaired. The amount of movement of the movable body 1 relative to the rotation angle of the drive pulley 7 is kept constant.

In assembling such a drive device, the belt 9 can be attached to the movable body 1 by the method shown in FIG. 2. That is, one end of the belt 9 wound around the pulley 7 is first screwed only to the right end side of the movable body 1 in the figure, and the other end of the belt 9 is pulled in the longitudinal direction by the spring 15 while the belt 9 and the elastic member are tightened. 14 are fastened together with the screw 10 to the left end side of the movable body 1 in the figure. In this way, the tension of the spring 15 allows the belt 9 to be stretched at a constant tension.

Note that the present invention is not limited to the above embodiments. For example, in the above embodiment, the belt 9 is stretched over one side of the moving body 1, but a belt 9 that is sufficiently longer than the length of one side of the moving body 1 is used, and is stretched across multiple sides of the moving body 1. It may also be strung up. In this case, the escape recess 13 may be provided on a side surface other than the side surface facing the drive pulley 7.

[Effects of the invention] As described above based on the embodiments, according to the invention, expansion and contraction of the belt due to temperature changes etc. can be absorbed within the escape recess 13, and the belt 9
Since the linearity of is maintained, the amount of movement of the movable body 1 relative to the rotation angle of the drive pulley 7 can always be kept constant, and the reciprocating body drive has a simple configuration and is suitable for a carrier drive device of a serial printer. equipment can be provided.

[Brief explanation of drawings]

FIG. 1 is a partial plan view showing an embodiment of the present invention;
FIG. 2 is a partial plan view for explaining the assembly process in the same embodiment, FIG. 3 is a perspective view showing a conventional example, and FIG. 4 is a partial plan view of the conventional example. DESCRIPTION OF SYMBOLS 1... Moving body, 3... Guide shaft, 5... Stepping motor, 7... Drive pulley, 8... Side surface of moving body, 9... Belt, 13... Narrow range recess,
14...Elastic member.

Claims (1)

[Scope of utility model registration request] Both ends of a belt are fixed to the sides of a movable body that is provided for reciprocating movement, and the belt is wound around a drive pulley so that at least a portion of the belt is stretched in a substantially straight line in the direction of movement of the movable body. A narrow relief recess is provided on the side surface of the movable body at a portion where the belt contacts, excluding the area facing the drive pulley, and the belt is disposed on the movable body above the relief recess. A reciprocating body drive device characterized in that an elastic member that applies pressure from the outer surface side is attached.