JPH09210155A - Pulley belt mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the running performance more than the conventional pulley. SOLUTION: By providing a pulley 1 rotatable in the curved state, and by driving a belt 4 applied between the pulley 1 and another pulley 2 such that the axially center portion 5 of the pulley 1 is displaced inwardly by the belt tension, a force directed to the axially center portion 5 of the pulley 1 is applied to the belt 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt pulley mechanism such as a flat belt for power transmission.

[0002]

2. Description of the Related Art Conventionally, flat pulleys for conveyors have been tapered according to the concept of a crown in order to stabilize the running of the belt.

However, the crown effect is not always an effective countermeasure when the belt width is wide or the belt rigidity is high. In addition, the accuracy of the pulley mounting position is rough, and if the offset amount / offset angle exceeds the standard allowable value, the crown does not work at all. Further, when the belt mounting tension decreases with time, the frictional centripetal force due to the crown effect decreases and the belt running property deteriorates (belt deviation or meandering). When these phenomena occur, the belt eventually deviates from the pulley.

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention
It is an object of the present invention to provide a belt pulley mechanism that is more excellent in travelability than ever before.

[0005]

In order to solve the above-mentioned problems, the present invention employs the following technical means.

The belt pulley mechanism of the present invention is provided with a pulley capable of rotating in a curved state, and the belt is wound between the pulley and another pulley so that the pulley has a substantially central region in the axial direction. Is driven in a state of being displaced inward by the belt tension, so that a force acting on the belt toward the central area in the axial direction of the pulley acts on the belt.

The belt is wound around a pulley that can rotate in such a curved state and another pulley, and the belt is in a state where the pulley is inwardly displaced in a substantially central region in the axial direction of the pulley. When driven, the belt is wound around the pulley and driven following it. A component force is generated in the belt in the substantially central area in the axial direction. Works, so
The belt is difficult to separate from the pulley. Therefore, the running property is superior to the conventional one.

As the pulley, a driven pulley and / or a driving pulley can be selected. It is also possible that the pulley is divided into two or more portions substantially symmetrically with respect to the axial direction, and the divided ends are connected in a manner capable of transmitting the axial rotation.

Further, the pulley can be divided into three parts substantially symmetrically with respect to the axial direction. According to this structure, the belt that follows the parts on both sides of the three-part pulley has a force acting toward the central area in the axial direction as described above, and the belt is divided substantially symmetrically in three parts in the axial direction. The belt wound around the center is almost parallel to the other pulley, and the belt located in the center of the inwardly displaced pulley and following the place substantially parallel to the other pulley has a stable tension. Therefore, the running property of the belt is easily stabilized.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) In this embodiment, a conveyor for power transmission is formed using a flat belt, and the pulley mechanism of the belt is configured as follows.

As shown in FIGS. 1 to 3, the belt pulley mechanism of this embodiment includes a pulley 1 capable of rotating in a curved state as described later. In this embodiment, the driven pulley 1 is selected as the pulley 1. A driving pulley can be selected as the pulley that can rotate in a curved state.

The driving pulley 2 (corresponding to the other pulley in the means for solving the problems) is rotationally driven by the motor M via the toothed belt 3. The flat belt 4 is wound around the driven pulley 1 and the driving pulley 2, and the flat belt 4 is driven in a state where the substantially central region 5 in the axial direction of the driven pulley 1 is displaced inward by the belt tension. As a result, a force is exerted on the flat belt 4 toward the axial central region 5 of the driven pulley 1.

The driven pulley 1 is divided into two or more portions substantially symmetrically with respect to the axial direction. In this embodiment, the driven pulley 1 is symmetrically divided in three parts in the axial direction. The driven pulley 1 divided into three parts has a straight shape originally, and is not processed with a crown or a taper.

The split end 6 of the driven pulley 1 is connected in a manner capable of transmitting the shaft rotation. That is, the divided parts of the driven pulley 1 are connected by using a known universal joint 7 (see FIGS. 2 and 3). An inner part (not shown) with a built-in spring (or diaphragm plate) corresponding to the mounting tension of the flat belt 4 wound around the driven pulley 1 is used for this universal joint portion. It is easy to apply tension. A self-aligning type bearing (a known pillow block or the like) is used for the bearing portion 8 of the shaft of the driven pulley 1. With this bearing,
Belt tension can also be adjusted.

Next, a usage state of the belt pulley mechanism of this embodiment will be described. A flat belt 4 is wound around a driven pulley 1 and a driving pulley 2 that can rotate in a curved state, and a substantially central region 5 in the axial direction of the driven pulley 1 is displaced inward by belt tension. When the belt is driven in this state, the flat belt 4 wound around the driven pulley 1 and driven following the driven pulley 1 has a substantially central region 5 in the axial direction.
A component force toward the flat belt 4 is generated, and a force is exerted on the flat belt 4 toward the central area 5 in the axial direction of the driven pulley 1. Therefore, the belt is difficult to be separated from the pulley. That is, since the belt is difficult to be separated from the pulley, there is an advantage that the running property is superior to the conventional one.

Further, a force toward the central area 5 in the axial direction acts on the flat belt 4 which follows the parts on both sides of the three-part driven pulley 1, and the driven pulley 1 is symmetrically divided into three parts in the axial direction. The flat belt 4 wound around the center of the driven pulley 2 is parallel to the opposing drive pulley 2, and is located at the center of the driven pulley 1 displaced inward and parallel to the drive pulley 2. Since a stable tension is applied to the flat belt 4 that follows, there is an advantage that the running property of the belt is easily stabilized.

Further, according to this embodiment, it is not necessary to perform complicated processing such as crown and taper on the pulley, and the running stability of the belt is excellent. There is also an advantage that it can be suppressed more than the above, and the aligning action can be obtained even if the dimensional accuracy of the pulley is somewhat poor. (Embodiment 2) Next, Embodiment 2 will be described focusing on differences from Embodiment 1.

As shown in FIG. 4, in this embodiment, when the substantially central region 5 in the axial direction of the driven pulley 1 is displaced inward by a certain appropriate range due to the belt tension, the backup roller 9 is moved.
Are in contact with each other and prevent further displacement. With this configuration, excessive displacement of the driven pulley 1 inward and excessive bending deformation are prevented, and proper positioning of the driven pulley 1 and proper tension of the belt are ensured.

The pulley 1 may be divided into two (not shown) instead of three as described above, or may be divided into four or more (not shown).

When the pulley 1 is used in a divided form, the connecting element at the divided end may be one that utilizes the restoring force of the elastic body. Further, the pulley 1 which can be elastically deformed is used, and the pulley 1 is not divided.
It can also be carried out using a continuous pulley 1 of books.

[0021]

The present invention is configured as described above and has the following effects.

Since the belt is difficult to separate from the pulley, it is possible to provide a belt pulley mechanism which is more excellent in running property than conventional belts.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view illustrating a first embodiment of a belt pulley mechanism of the invention.

2 is a plan view illustrating the structure of a driven pulley of the pulley mechanism of the belt in FIG.

FIG. 3 is a plan view illustrating a state in which a substantially central region in an axial direction of a driven pulley of the belt pulley mechanism of FIG. 1 is displaced inward by belt tension.

FIG. 4 is a partially cutaway perspective view illustrating a second embodiment of the belt pulley mechanism of the invention.

[Explanation of symbols]

 1 pulley (driven pulley) 2 other pulley (driving pulley) 4 belt (flat belt) 5 axial center area 6 split end

Claims (4)

[Claims] 1. A pulley is provided which is rotatable in a curved state, and a belt is wound between the pulley and another pulley so that a substantially central region in the axial direction of the pulley is inward by belt tension. A belt pulley mechanism, wherein the belt is driven in a displaced state so that a force is exerted on the belt toward a central region in the axial direction of the pulley. 2. The driven pulley or / as the pulley
2. The belt deviation adjusting shaft mechanism according to claim 1, wherein the drive pulley is selected. 3. The pulley of a belt according to claim 1, wherein the pulley is divided into two or more portions substantially symmetrically with respect to the axial direction, and the divided ends are connected in a manner capable of transmitting the axial rotation. mechanism. 4. The pulley mechanism for a belt according to claim 3, wherein the pulley is divided into three parts substantially symmetrically with respect to the axial direction.