JP4659207B2 - Pulley support structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a support structure for a pulley.
[0002]
BACKGROUND OF THE INVENTION
For transporting an electronic substrate or the like, a transport mechanism is used that transports by placing both ends of the substrate on a pair of endless resin belts. The endless belt is formed by bonding both end portions of the belt.
However, it is inevitable that the bonding state of the belt becomes uneven at the bonding position, and this makes it easy for the belt 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 that adjusts the posture of the pulley that supports the belt.
On the other hand, in recent years, electronic substrates have been downsized, and downsizing of a transport system is required. Therefore, downsizing of the meandering prevention mechanism is important.
[0003]
Accordingly, an object of the present invention is to provide a pulley support structure having a compact meandering prevention mechanism.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, a pulley support structure according to the present invention includes a pulley around which an endless belt is wound, and a protrusion that rotatably supports the pulley and protrudes from both side surfaces of the pulley. A pulley support structure comprising: a support shaft having a support shaft; and a bracket having a pair of receiving portions into which a protrusion portion of the support shaft fits, and the pulley rotatably supporting the pulley via the support shaft. The shaft is formed with a female screw on the same axis, a notch hole is formed in a part of the protruding portion of the support shaft so that the female screw is exposed, and a male screw having a tapered conical surface at the tip. The member is screwed into the female screw, and the tapered conical surface of the male screw member is in contact with the bracket, whereby the posture of the support shaft with respect to the bracket is determined.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, a pulley 2 around which an endless belt B is wound is supported by a support structure including a support shaft 1 and a bracket 3.
[0006]
FIG. 2 is an exploded perspective view of the support structure from the plane direction.
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 protrusions 10a and 10b protruding from both side surfaces of the pulley 2, and flange-like fixing parts 13 and 13 are provided at both ends of the protrusions 10a and 10b. Yes.
An adjustment hole 12 is bored coaxially in the support shaft 1, and a female screw is formed on the inner periphery of the adjustment hole 12. Of the two protruding portions 10a and 10b, one protruding portion 10a is formed with a notch hole 11 in which a part of the protruding portion 10a is opened and the adjustment hole 12 is exposed.
[0007]
The support shaft 1 includes a male screw member 4 screwed into the adjustment hole 12 and a lock bolt (lock male screw member) 5 for preventing the male screw member 4 from loosening. Male screws are formed on the outer circumferences of the male screw member 4 and the lock bolt 5, respectively. Hexagonal holes (not shown) are formed at the rear ends of the male screw member 4 and the lock bolt 5, respectively, and the inside of the adjustment hole 12 can be advanced and retracted using a hexagonal wrench. A tapered conical surface 41 having a tapered conical shape is formed at the tip of the male screw member 4.
[0008]
The bracket 3 is fixed to a frame 6 indicated by a two-dot chain line through an attachment portion 35, and has a pair of plate portions 32, 32 at both ends. As shown in the plan end view of FIG. 3, the plate portions 32, 32 are provided so as to face both side surfaces of the pulley 2. The plate portion 32 shown in FIG. 2 is formed with receiving portions 30a and 30b that fit into the protruding portions 10a and 10b.
[0009]
Of the plate portions 32, 32, the end portion of the plate portion 32 that fits into the protruding portion 10 a having the cutout hole 11 enters the adjustment hole 12, and forms a tapered conical surface 41 of the male screw member 4. An abutting portion 31 that abuts is formed. As shown in FIG. 3, when the male screw member 4 is screwed into the adjustment hole 12, the tapered conical surface 41 is exposed from the notch hole 11 to contact the contact portion 31, and the plate portion 32 is tapered. The posture of the support shaft 1 with respect to the bracket 3 is determined by being fixed between the conical surface 41 and the fixing portions 13 and 13.
[0010]
Next, a method for adjusting the belt so as not to meander will be described.
First, the belt B is wound around the pulley 2, and the pulley 2 is rotated in a state where the male screw member 4 is screwed into the adjustment hole 12 and is in contact with the contact portion 31 of the plate portion 32. When the belt B meanders, the meandering adjustment is performed as follows by rotating the male screw member 4 to advance and retreat in the axial direction X.
[0011]
The support shaft 1 and the male screw member 4 integrated by screws are attracted in the direction of the arrow A by the belt B, and are in contact with the 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 is tilted in the Y1 direction. On the other hand, when the male screw member 4 is advanced in the X2 direction, the support shaft 1 is tilted in the Y2 direction.
In this way, by moving the male screw member 4 back and forth, the contact portion P2 on the tapered conical surface 41 that is in contact with the plate portion 32 moves, and the attachment angle of the support shaft 1 to the bracket 3 changes, The posture of the pulley 2 changes. Therefore, the meandering of the belt B can be prevented by adjusting the posture of the pulley 2 with respect to the belt B by moving the male screw member 4 back and forth.
[0012]
After the adjustment, the lock bolt 5 for preventing loosening of the male screw member 4 is screwed into the female screw of the adjustment hole 12 and brought into contact with the rear end portion of the lock bolt 5.
[0013]
As described above, the preferred embodiments have been described with reference to the drawings. However, those skilled in the art will readily understand various changes and modifications within the obvious scope by looking at the present specification.
For example, the shape of the abutting portion of the bracket that abuts on the tapered conical surface of the male screw member may be any shape as long as the tapered conical surface abuts and the posture of the support shaft relative to the bracket can be determined.
Accordingly, such changes and modifications are to be construed as within the scope of the present invention as defined by the claims.
[0014]
【The invention's effect】
As described above, according to the present invention, since the tapered conical surface of the male screw member is in contact with the bracket, the posture of the support shaft with respect to the bracket is determined. By adjusting the posture of the pulley, the meandering of 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 remarkably 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 pulley support structure;
[Explanation of symbols]
1: Support shaft B: Belt 2: Pulleys 10a, 10b: Protrusions 30a, 30b: Receiving part 3: Bracket 11: Notch hole 41: Tapered conical surface 4: Male screw member 5: Lock bolt (Male screw member for locking) )

Claims (2)

A pulley around which an endless belt is wound;
A support shaft that rotatably supports the pulley and has protrusions protruding from both side surfaces of the pulley;
A pulley support structure comprising a pair of receiving portions into which the protruding portions of the support shaft fit, and a bracket for rotatably supporting the pulley via the support shaft,
The support shaft is formed with a female screw on the same axis,
A notch hole is formed in a part of the protruding portion of the support shaft so that the female screw is exposed,
A male screw member having a tapered conical surface having a tapered conical shape at the tip is screwed into the female screw,
A pulley support structure in which a taper conical surface of the male screw member is in contact with the bracket so that a posture of the support shaft with respect to the bracket is determined. In claim 1,
A pulley support structure in which a male screw member for locking that prevents loosening of the male screw member is screwed into the female screw.

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