JP2002188700A - Support structure for pulley - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a support structure for a pulley having a compact meandering preventing mechanism. SOLUTION: A support axis 1 is provided with a coaxial female screw. A notch 11 is formed at a part of a protrusion 10a of the support axis 1 so as to allow the female screw to be exposed. A male screw member 4 having a tapered conical surface 41 on its tip is screwed into the female screw. The tapered conical surface 41 of the male screw member 4 is abutted on a bracket 3. The attitude of the support axis 1 toward the bracket 3 is thus determined.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pulley support structure.

[0002]

2. Description of the Related Art For transporting electronic substrates and the like, a transport mechanism is used in which both ends of the substrate are placed and transported on a pair of endless resin belts. The endless belt is formed by bonding both ends of the belt. However, it is inevitable that the joining state of the belts becomes uneven at the bonding position, and thereby the belt is likely to meander. When the meandering occurs, not only accurate conveyance is not performed, but also the belt may be detached from the pulley. Therefore, in order to prevent the meandering, it is important to provide a meandering prevention mechanism for adjusting the posture of the pulley supporting the belt. on the other hand,
In recent years, miniaturization of electronic substrates has progressed, and miniaturization of transport systems has been required. Therefore, miniaturization of the meandering prevention mechanism is important.

Accordingly, it is an object of the present invention to provide a pulley support structure having a compact meandering prevention mechanism.

[0004]

In order to achieve the above object, a pulley supporting structure of the present invention comprises a pulley on which an endless belt is wound, a pulley rotatably supported on the pulley, and a pulley. A pulley comprising: a support shaft having a protrusion protruding from both side surfaces of the support shaft; and a bracket having a pair of receiving portions into which the protrusion of the support shaft fits and rotatably supporting the pulley via the support shaft. The support shaft has a female screw formed coaxially on the support shaft, a notch hole is formed in a part of a protruding portion of the support shaft so that the female screw is exposed, and a tapered cone at a tip end. A male screw member having a tapered conical surface is screwed into the female screw, and the attitude of the support shaft with respect to the bracket is determined by the tapered conical surface of the male screw member being in contact with the bracket. The feature is that That.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the pulley 2 around which the endless belt B is wound is supported by a support structure including a support shaft 1 and a bracket 3.

FIG. 2 is an exploded perspective view of the support structure viewed from a plane. As shown in FIG. 2, the pulley 2 is rotatably supported on the support shaft 1 via a bearing 14 (FIG. 3). The support shaft 1 is provided with a pair of projecting portions 10a, 10b projecting from both side surfaces of the pulley 2, and at both ends of the projecting portions 10a, 10b, flange-shaped fixing portions 13, 13 are provided. I have. The support shaft 1
An adjustment hole 12 is formed coaxially in the inside, and a female screw is formed on the inner periphery of the adjustment hole 12. A cut-out hole 11 is formed in one of the protrusions 10a and 10b, in which a part of the protrusion 10a is opened to expose an adjustment hole 12.

The support shaft 1 has a male screw member 4 screwed into the adjusting hole 12 and a lock bolt (male member for locking) 5 for preventing the male screw member 4 from being loosened. On the outer periphery of the male screw member 4 and the lock bolt 5,
Each has an external thread. A hexagonal hole (not shown) is formed at the rear end of the male screw member 4 and the rear end of the lock bolt 5, respectively.
2 can be moved back and forth. A tapered conical surface 41 having a tapered conical shape is formed at the tip of the male screw member 4.

The bracket 3 is fixed to a frame 6 indicated by a two-dot chain line via a mounting portion 35, and has a pair of plate portions 32 at both ends. 3, the plate portions 32, 32 are provided so as to face both side surfaces of the pulley 2. As shown in FIG. Plate part 3 shown in FIG.
2, a receiving portion 30 fitted into the protruding portions 10a, 10b.
a and 30b are formed.

The notch 1 of the plate portions 32
1 at the end of the plate portion 32 that fits into the protrusion 10a having
A contact portion 31 that penetrates into the adjustment hole 12 and contacts the tapered conical surface 41 of the male screw member 4 is formed. FIG.
When the male screw member 4 is screwed into the adjustment hole 12 as shown in FIG.
Is exposed and comes into contact with the contact portion 31, and the plate portion 32 is fixed between the tapered conical surface 41 and the fixing portions 13, 13, whereby the attitude of the support shaft 1 with respect to the bracket 3 is determined.

Next, a method of adjusting the belt so as not to meander will be described. First, the belt B is wound around the pulley 2, and the male screw member 4 is screwed into the adjustment hole 12 so that the plate portion 3 is formed.
The pulley 2 is rotated in a state where the pulley 2 is in contact with the contact portion 31 of FIG. If the belt B meanders, the male screw member 4
Is rotated to move in the axial direction X, thereby performing meandering adjustment as described below.

The support shaft 1 and the male screw member 4 integrated by screws are attracted by a belt B in the direction of arrow A,
It is in contact with bracket 3 at points P1 and P2. The posture of the support shaft 1 is determined by this contact state.
For example, when the male screw member 4 is retracted in the X1 direction, the support shaft 1 tilts in the Y1 direction. On the other hand, when the male screw member 4 advances in the X2 direction, the support shaft 1 tilts in the Y2 direction. In this way, by moving the male screw member 4 forward and backward, the contact portion P2 on the tapered conical surface 41 contacting the plate portion 32 moves, and the mounting angle of the support shaft 1 to the bracket 3 changes, The attitude of the pulley 2 changes. Therefore, the belt B can be prevented from meandering by adjusting the attitude of the pulley 2 with respect to the belt B by moving the male screw member 4 forward and backward.

After the adjustment, the lock bolt 5 for preventing the male screw member 4 from being loosened is screwed into the female screw of the adjustment hole 12 and brought into contact with the rear end of the lock bolt 5.

As described above, the preferred embodiments have been described with reference to the drawings. However, those skilled in the art will easily envisage various changes and modifications within the obvious scope by referring to the present specification. Would. For example, the shape of the contact portion of the bracket that contacts the tapered conical surface of the male screw member may be any shape that allows the posture of the support shaft to be determined with respect to the bracket by contact of the tapered conical surface. Accordingly, such changes and modifications are to be construed as being within the scope of the invention as defined by the appended claims.

[0014]

As described above, according to the present invention,
Since the attitude of the support shaft with respect to the bracket is determined by the tapered conical surface of the male screw member abutting on the bracket, the attitude of the pulley is adjusted by moving the male screw member back and forth to meander the belt. Can be prevented.
Further, since the male screw member for adjusting the posture of the pulley is provided in the support shaft, the meandering prevention mechanism can be significantly reduced in size.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a pulley support structure according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a support structure of the pulley.

FIG. 3 is a plan end view showing a support structure of the pulley.

[Explanation of symbols]

 1: Support shaft B: Belt 2: Pulley 10a, 10b: Projecting portion 30a, 30b: Receiving portion 3: Bracket 11: Notched hole 41: Tapered conical surface 4: Male screw member 5: Lock bolt (male screw member for locking) )

Claims (2)

[Claims] 1. A pulley on which an endless belt is wound, a support shaft rotatably supporting the pulley and having a protrusion protruding from both side surfaces of the pulley, and a protrusion of the support shaft. A pulley support structure having a pair of receiving portions fitted therein and a bracket rotatably supporting the pulley via the support shaft, wherein the support shaft has a female screw formed coaxially. A notch hole is formed in a part of the projecting portion of the support shaft so that the female screw is exposed, and a male screw member having a tapered conical surface at the tip is screwed into the female screw. A pulley support structure in which the attitude of the support shaft with respect to the bracket is determined by the tapered conical surface of the member abutting on the bracket. 2. The pulley support structure according to claim 1, wherein a locking male screw member for preventing the male screw member from being loosened is screwed into the female screw.