JPH0444910Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a timing belt elasticity adjusting device for driving an X cursor, etc. of an X-Y automatic drafting machine.

[Conventional technology]

This type of device generally has a configuration in which a timing belt is held under pressure between a substrate and a pressing member, as shown in Japanese Utility Model Application Publication No. 59-112061.

[Problem that the invention attempts to solve]

According to this configuration, if a large load is applied to the timing belt in a direction that causes it to shift relative to the board, the timing belt shifts relative to the board, resulting in a defect in that the tension of the timing belt becomes small.

The present invention aims to eliminate the above defects.

[Means to solve problems]

In order to achieve the above object, the present invention supports the pressing bodies 32 and 34 on the mounting surface of the board 22, disposing the timing belt 12 between the mounting surface and the pressing bodies 32 and 34, and supporting the pressing bodies 32 and 34 on the mounting surface of the substrate 22. In the device in which the timing belt 12 is pressed onto the mounting surface of the board 22 by a pressing force, the timing belt 12 is pressed against the mounting surface of the board 22.
The mounting surface of the timing belt 12 is provided with uneven portions 22a and 22b that engage with the teeth of the timing belt 12.

[Effect]

When the timing belt 12 is under a predetermined tension, its teeth touch the uneven portions 22 of the base plate 22.
a, 22b, and in this state is pressed between the mounting surface of the substrate 22 and the pressing bodies 32, 34. Therefore, even if a large load is applied to the timing belt 12 in a direction that deviates from the mounting surface of the board 22,
Since the mounting surfaces of the timing belt 12 and the board 22 are in mesh with each other, the timing belt 12 does not shift relative to the board 22, and the tension of the timing belt 12 is maintained in a constant state.

[Example] The structure of the present invention will be described in detail below based on an example shown in the accompanying drawings.

Reference numeral 2 designates the base of the X-Y automatic drafting machine, on both sides of which belt pulleys 6 (the other pulley is not shown) are rotatably supported, each having teeth for a timing belt. Pulley 6 is connected to a belt pulley 10 driven by an X motor.
An endless timing belt 12 is stretched between the pair of pulleys 6. An X-axis rail 18 is installed on plates 16 (the other plate is not shown) fixed to both sides of the base 2.
A horizontal hole for an X cursor 20 is slidably inserted into the shaft rail 18. Reference numeral 22 denotes a substrate integrally formed with the X cursor 20, and on both sides of the upper surface of this substrate, uneven portions 22a and 22b for engaging with the teeth of the timing belt 12 are formed. Reference numeral 24 denotes a cover member, both sides of which are formed in a U-shape, and the U-shaped portions fit into both sides of the substrate 22. The cover member 2
The vertical walls of the U-shaped portion 4 are in contact with both side surfaces of the substrate 22, and belt guide holes 2 are formed in the vertical walls.
6 and 28 are transparently provided, and the timing belt 12 is fitted into the guide holes 26 and 28. A hole 30 is provided in a substantially central portion of the flat plate portion of the cover member 24 . Screw holes are formed near both sides of the flat plate portion of the cover member 24, and pressing bodies 32 and 34 made of fixing screws are screwed into the screw holes. The tips of the pressing bodies 32 and 34 touch the substrate 2
It is set to be located directly above the uneven portions 22a and 22b of No.2. Numerals 36 and 38 are locking nuts. Note that the cover member 24 may be formed integrally with the substrate 24.

Next, the operation of this embodiment will be explained.

When applying tension to the timing belt 12, first use a screwdriver (not shown).
With this, the pressing bodies 32 and 34 are rotated to reduce the amount of protrusion of their tips from the inner wall surface of the flat plate portion of the cover member 24. Next, the timing belt 12 is pulled out by an appropriate amount from the hole 30 of the cover member 24 using a screwdriver or other suitable rod-like member, and the tension of the timing belt 12 is set to a desired level.

Next, with the timing belt 12 set at the desired tension, the pressing bodies 32 and 34 are screwed into the screw holes of the cover member 24, and the timing belt 12 is crimped onto the mounting surface of the board 22 with the tips of the pressing bodies 32 and 34. . Due to the pressure of the pressing bodies 32 and 34, the teeth of the timing belt 12 are pressed against the base plate 22.
The pressing members 32, 34 and the upper surface of the substrate 22 are held in a pinched state while engaging with the uneven portions 22a, 22b of the mounting surface. In this state, the timing belt 12
When the timing belt 12 is rotated, the X cursor 20 connected to the timing belt 12 moves along the X-axis rail 18.

〔effect〕

As described above, in the present invention, the teeth of the timing belt are engaged with the uneven portion of the board, and the timing belt is press-bonded to the uneven portion, so that the load is applied in the direction in which the timing belt shifts relative to the board. Even in the past, the belt did not shift relative to the board due to its meshing structure with the board.
The timing belt can be held at a desired tension. Further, since the U-shaped cover member having a hole in the center is provided, there is an effect that the tension adjustment work of the timing belt can be easily performed.

[Brief explanation of the drawing]

The figures show a preferred embodiment of the invention, with FIG. 1 being a side view and FIG. 2 being a plan view. 2...Base, 6...Belt pulley, 10...Belt pulley, 12...Timing belt, 18...
...X-axis rail, 20...X cursor, 22... Board, 22a, 22b... Uneven portion, 26, 28...
Guide hole, 24...Cover member.

Claims (1)

[Scope of utility model registration request] A U-shaped cover member 24 having a hole 30 in the center is disposed on the mounting surface of the substrate 22, and pressing bodies 32, 34 are supported on this cover member 24, and the timing belt 12 is connected to the mounting surface and the pressing body. 32 and 34, and the timing belt 12 is pressed onto the mounting surface of the substrate 22 by the pressing force of the pressing bodies 32 and 34.
It is characterized in that uneven parts 22a and 22b that mesh with the teeth of the timing belt 12 are formed on the mounting surface of the timing belt 12, so that the timing belt 12 is pinched by the pressing bodies 32 and 34 and the uneven parts 22a and 22b. Timing belt tension adjustment device.