JPH02275160A - Winding transmission device - Google Patents

Abstract

PURPOSE:To prevent to generate an uneven rotation in case of the load variation by making it possible to rotate an arm to hold two auxiliary wheels, and to contact the two auxiliary wheels with two springs under the condition to balance to a winding transmission member. CONSTITUTION:Two auxiliary wheels 7 and 8 are held rotatable to support shafts fixed to an arm 6 respectively, and the arm 6 is held rotatable to a bracket 10 by a holding pin 9 at the middle position between the auxiliary wheels 7 and 8. The bracket 10 is fixed to a device frame 11 by a pin 12, a tensile force or a pressing force is given by springs 13 and 14 to both ends of the arm 6, and by rotating the arm 6 in the arrow direction by the holding pin 9 as the fulcrum, the two auxiliary wheels 7 and 8 are contacted to a belt 3 with teeth in a good balance. Even through the load of an idler wheel 2 is varied and the belt 3 with teeth generates a looseness, the arm is rotated and the two auxiliary wheels 7 and 8 absorb the looseness. Consequently, the rotation of a driving wheel 1 is delivered to the idler wheels 2 accurately, and no uneven rotation is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wrap transmission device such as a belt device, a chain device, a wire device, etc.

[Prior art]

BACKGROUND ART Wrap transmission devices are widely used in which the driving force of a drive pulley or the like as a drive wheel is transmitted to at least one driven pulley or the like as a driven wheel using a toothed belt or the like as a wrap transmission member.

In a winding transmission, if there is a change in the load on the driven wheel, the winding transmission member will bend, and even if the driving wheel rotates accurately, the driven wheel will rotate unevenly, making it difficult for the driving side to rotate accurately. The problem was that it wasn't communicated.

[Problem to be solved by the invention]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and to provide a simple wrap-around transmission device that does not cause uneven rotation even when the load fluctuates.

[Means to solve the problem]

The present invention solves the above problem by a winding wheel having a driving wheel, at least 61 driven wheels, a winding transmission member wound around the driving wheel and the driven wheels, and a tensioner applying tension to the winding transmission member. In the hanging transmission device, one arm rotatably supports two auxiliary vehicles at respective fixed support positions, a bracket rotatably supports the arm at an intermediate position between the two support positions, and the auxiliary vehicle The problem has been solved by a wrap-around transmission device characterized in that a tensioner is provided with two springs attached to both ends of the arm so as to pressurize the wrap-around transmission member.

[Effect]

According to the present invention, two auxiliary wheels supported by an arm are pressed against the wrap-around transmission member, and apply tension to the wrap-around power transmission member. Two springs acting on both ends of the arm maintain the two auxiliary wheels in a balanced state and in pressure contact with the wrap-around transmission member.

Even if the load on the driven vehicle fluctuates and the wrapped transmission member bends due to elongation of the wrapped transmission member itself or inclination of the support shaft,
The arm rotates around the support shaft, absorbs deflection from the movement of the auxiliary vehicle, and transmits accurate motion to the driven vehicle.

The bracket that rotatably supports the arm is made movable, and the support member is pulled or pressed in a direction that presses the auxiliary vehicle against the wrapped transmission member using the force of the auxiliary spring, thereby reducing the wrapped transmission due to load fluctuations on the driven vehicle. The deflection of the member can be absorbed more reliably.

〔Example〕

The details of the present invention will be explained based on embodiments shown in the drawings.

1 and 2 show an example in which a toothed belt is used as the winding transmission member.

A toothed belt 3 is wound around a driving pulley I as a driving wheel and a driven pulley 2 as a driven wheel. Although one example of the slave pulley 2 is shown, it is also possible to arrange a plurality of slave pulleys.

The toothed belt 3 is rotatably supported at a fixed position, and initial tension is applied to the toothed belt 3 by a first auxiliary pulley 4 used as a tensioner. Furthermore, an auxiliary tensioner 5 is provided. The auxiliary tensioner 5 supports two auxiliary wheels at supporting positions set at intervals on the arm 6, for example, a second auxiliary pulley 7.
and a third auxiliary pulley 8, the arm 6
The second auxiliary pulley 7 and the third auxiliary pulley 8 are each rotatably supported on a support shaft fixed to. The spindle itself can also be rotatably supported.

The arm 6 is rotatably supported on the bracket 10 by a support pin 9 at a position approximately midway between the support shafts for both the auxiliary pulleys 7.8. The bracket 10 is fixed to the machine frame 11 with pins 12. In this case, the bracket 10 can also be formed as part of the machine frame 11 itself.

Both ends of the arm 6 are applied with tension or pressure by springs 13, 14 to press the second auxiliary pulley 7 and the third auxiliary boot 1 and 8 against the toothed belt 3, respectively.

By freely rotating the arm 6 about the support pin 9 in the direction shown by the arrow, two auxiliary boots U-7,
8 is pressed against the toothed belt 3 in a balanced state.

When the load on the driven pulley 2 fluctuates and the toothed belt 3 is deflected, the arm 6 rotates in accordance with the deflection.
The deflection of the toothed belt 3 is absorbed by the 21st pulley 7 and the third auxiliary pulley 8.

Therefore, the rotation of the drive pulley 1 is accurately transmitted to the driven pulley 2.

In some cases, the tensioner formed by the first auxiliary pulley 4 may be omitted, or may be additionally provided.

As shown in FIGS. 3 and 4 as a modified example of the example in FIG. An elongated hole 15 extending on a line extending through the support pin 9 in the intersecting direction is formed in the bracket lO. The bracket 10 is attached to the machine frame 11 by a pin 12 in its elongated hole 15.
is slidably supported. A pressing force that presses the second auxiliary pulley 7 and the third auxiliary pulley 8 against the toothed belt 3 by the tension or pressing force of the auxiliary spring 16 is additionally applied to the bracket 10 in addition to the force of the spring 13.14. Ru.

The other configurations in FIGS. 3 and 4 are the same as those in FIGS. 1 and 2, so the same or corresponding parts are given the same reference numerals and the explanation will be omitted.

〔effect〕

According to the present invention, the arm that supports the two auxiliary wheels is made rotatable, and the two springs press the two auxiliary wheels against the winding transmission member in a balanced state, so that the winding transmission can be reduced due to load fluctuations. It was possible to absorb the deflection of the wrapped transmission member by slightly moving it relative to the member, and it was possible to reduce rotational unevenness that occurs when power is transmitted from the driving wheel to the driven wheel.

According to the present invention, the bracket supporting the arm is slidably supported, and the auxiliary spring is used to pull or press the bracket, thereby making it possible to more reliably absorb the deflection of the wrapped transmission member.

[Brief explanation of drawings]

FIG. 1 is an explanatory front view of the wrapped transmission device according to the present invention, and FIG.
The figure is a plan view, FIG. 3 is a diagram corresponding to FIG. 1 of a modification, and FIG. 4 is a diagram corresponding to FIG. 2 of a modification. l... Drive wheel 2... Driven wheel 3... Wrap transmission member 4... Tensioner 5... Tensioner
6...Arm 7.8...Auxiliary vehicle 9...Support pin 10...Bracket 11...Machine frame 12...Pin 13.14...Spring 15...Elongated hole
16... Auxiliary spring Figure 1 Figure 2

Claims (2)

[Claims] (1) In a wrap transmission device having a driving wheel, at least one driven wheel, a wrap transmission member that is wound around the drive wheel and the driven wheel, and a tensioner that applies tension to the wrap transmission member, one arm that rotatably supports two auxiliary wheels at respective fixed support positions; a bracket that rotatably supports the arm at an intermediate position between the two support positions; 1. A wrap-around transmission device comprising: a tensioner having two springs attached to both ends of the arm so as to apply pressure toward the arm. (2) The bracket that rotatably supports the arm is supported by the machine frame so that its position can be adjusted in a direction intersecting a line connecting the support positions of the two auxiliary vehicles, and the bracket is supported by the machine frame so as to be adjustable in position, and receives the force of the auxiliary spring. The wrap transmission device according to claim 1, wherein the auxiliary wheel can be additionally pressurized toward the wrap transmission member.