JPH06335829A - Automatic detecting mechanism for hole position in rotating shaft end surface - Google Patents

Abstract

PURPOSE:To automatically detect the screw hole position of a work and efficiently execute screwing work. CONSTITUTION:A hole 15 is preliminarily formed in a work 11, and a pin 7 to be engaged with the hole 15 is also preliminarily formed on an orientation part 1. After the work 11 is positioned on a jig, the orientation part 1 is lowered from the just above direction, and the pin 7 is rotated. At that time, the pin is slid on the end surface until the hole position is coincident to the pin, and when the pin is fitted to the hole, the pin is inserted to the hole, so that the shaft can be rotated integrally with the pin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for use in a case where a pressing plate is attached to an end face of a rotary shaft with a screw and the holes of two things are aligned and positioned at a desired position.
The present invention relates to a screw hole position detection mechanism having a shaft rotation stopping function.

[0002]

2. Description of the Related Art In the conventional screw tightening work, a screw hole is manually moved to a position where it can be easily tightened, and a jig with a pin (rotation stopper) is inserted into the screw hole on the shaft end face which is not tightened. After fixing the direction of rotation, the screws are tightened. That is, the conventional method is as follows. (1) Visually find a screw hole, move it to a position where it is easy to tighten the screw, set a fixing jig for stopping rotation, and tighten the screw. (2) After the screw holes are positioned, the jigs with the pins are used to fix them only in the rotational direction so that the thrust (axial direction) load is not directly applied to the shaft.

[0003]

However, it is difficult to automatically position the shaft end surface whose screw hole position and direction are not fixed, and the positioning pin slides on the surface during positioning. Friction occurs, and as a result, it is necessary to stop the center to prevent rotation (positional deviation) of the shaft,
For this reason, there arises a problem that a thrust load must be applied to some extent. Therefore, an object of the present invention is to automatically detect a screw hole and set the screw hole at a predetermined position, and before detecting the screw hole of the pin, fix the shaft with a minute thrust force, and the pin fixes the screw hole. The function is to have a shaft rotation stop function that rotates simultaneously with the shaft after detection and insertion.

[0004]

In order to solve such a problem, according to the present invention, in order to detect a hole formed on a pitch circle on the end face of a rotatable rotary shaft, a spring is formed on the same pitch circle diameter. The orientation head with the pin that can be expanded and contracted by is lowered from directly above, slide the pin on the end face until the hole position and the pin match, and when the pin and the hole match, insert the pin into the hole and rotate. It is characterized by rotating the shaft integrally with the pin. In the present invention, when detecting the hole position, in order to prevent the rotating shaft from rotating due to the frictional force generated when the pin slides on the surface of the rotating shaft,
A shaft rotation stop mechanism can be provided. Further, the shaft rotation stopping mechanism can be formed of a spring and an adjusting screw to enable adjustment of stroke and load and control of thrust load applied to the shaft.

[0005]

With respect to the rotary shaft whose position in the rotation direction is not fixed, the pressing plate is attached to the screw holes arranged on the pitch circle with several screws, so that the screw holes of the rotary shaft must be positioned. The rotary shaft is intended for those that cannot be overloaded in the axial direction. Therefore, a pin that can be expanded and contracted by a weak spring is incorporated, and the pin is inserted into the screw hole and positioned while rotating the orientation head. Further, in order to stop the rotation of the motor, a rotation stopping mechanism that holds down the central portion of the motor is provided.

That is, the first characteristic is the orientation pin. That is, an orientation head incorporating a pin on the same radius as the pitch circle diameter of the hole is brought closer from the rotation axis, the pin and the screw hole are aligned while the pin is rotated, and the pin is inserted into the screw hole for positioning. The second feature resides in the rotation stopping mechanism of the rotary shaft during orientation (rotation). That is, when detecting the hole axis, the axis rotates together with the orientation pin. Therefore, we adopted a mechanism that reduces the spring constant attached to the pin and stops the rotation by pressing the center of the shaft. This is before the pin enters the screw hole,
Strength to prevent rotation of the shaft while the pin slides on the shaft, and to rotate the shaft after the pin enters the hole, so that the thrust direction of the shaft is not affected (overload) Set to.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS All the drawings show the embodiments of the present invention. FIG. 1 is a block diagram showing the overall structure, FIG. 2 is an enlarged view of an orientation portion, and FIG. 3 is an explanation for explaining the relationship between pins and holes. It is a figure. Further, FIG. 1A is a top view, and FIG.
3 shows side views, the left half of FIG. 2 shows a state before pin insertion, the right half shows a state after pin insertion, and FIG.
The upper part of the figure shows the orientation part, and the lower part shows the work. In these figures, 1 is an orientation part, 2 is a cylinder, 3 is a pulse motor, and 4 is a pulse motor.
Is a large pulley, 5 is a small pulley, 6 is a timing belt, 7
Is a pin, 8 is a pin pressing spring, 9 is a rotation suppressing spring, 10 is a rotation suppressing spring, 11 is a work (rotating body), 12 is a holding plate,
13 is a jig, 14 is a spring pressure adjusting screw, and 15 is a hole.

That is, as shown in FIG. 3, the work 11 has six holes 15 (diameter D) formed substantially evenly on the radius R, while the orientation head 1 has three holes 15 under the same conditions. Pin 7 (diameter d ≦ D) is formed. Of course, the number of these holes is not limited to the above. In such a configuration, first, the pressing plate 12, which is the object of screw tightening, is adsorbed (aerodynamic force, magnetic force, or the like) to the orientation head unit 1 and centered with the work 11. At this time, the work 11 having the hole 15 on the shaft end face is set on the jig 13, and the rotation restrainer 9 presses the work 11 by the cylinder 2 and lowers it until the restraining spring 10 bends (see FIG. 2).

When the work 11 is set, the hole 15 of the work 11 is not at the target position (posture), that is,
Since the pin 7 hardly enters the hole 15 as it is when it descends, the pin 7 is pressed by the surface of the work 11 at the same time as the orientation head part 1 is lowered, the pin 7 is retracted, and the pin pressing spring 8 bends. become. Next, orientation (positioning) is performed in this state.

That is, the pulse motor 3 shown in FIG. 1 is operated to move the small pulley (toothed pulley) 5 to 60 degrees (hole 15).
Since there are 6 at equal intervals, one interval is 60 degrees.
During rotation, the pin 7 will be inserted in line with the hole 15. At this time, since friction occurs when the pin 7 slides on the surface of the work 11, the work 11 is tried to be rotated, but the rotation can be suppressed by the rotation stopper 9 provided at the center. Also, pin 7
When entering the hole 15 and trying to rotate the work 11, the force overcomes the resistance force of the rotation suppression 9 and the work 11 can rotate.

For this reason, as shown in FIG. 2, the pressure of the pin 7 (friction force against the work 11) can be adjusted by the pin pressing spring 8, and the pressure of the rotation restraining member 9 (the rotation is stopped). The resistance force can be changed by the holding spring 10 and the spring adjusting screw 14.

[0012]

According to the present invention, (a) by positioning the work on the subordinate side,
It is possible to perform alignment with a rotary shaft that has not been positioned. (B) The direction of the work can be set at a step after the hole alignment, that is, at a position where the screw tightening work is easy. (C) Even if the load cannot be applied to the rotary shaft in the axial direction, the screws can be sufficiently tightened. The advantages such as are obtained.

[Brief description of drawings]

FIG. 1 is an overall view showing an embodiment of the present invention.

FIG. 2 is an enlarged view of an orientation unit in FIG.

FIG. 3 is an explanatory diagram for explaining a positional relationship between a pin and a hole.

[Explanation of symbols]

1 ... Orientation part, 2 ... Cylinder, 3 ... Pulse motor, 4 ... Large pulley, 5 ... Small pulley, 6 ... Timing belt, 7 ... Pin, 8 ... Pin pushing spring, 9 ... Rotation suppression,
10 ... Anti-rotation spring, 11 ... Work (rotating body), 12 ...
Pressing plate, 13 ... Jig, 14 ... Spring pressure adjusting screw, 15 ...
hole.

Claims (3)

[Claims] 1. An orientation head having a pin elastically expandable and contractible by a spring on the same pitch circle diameter is lowered from directly above in order to detect a hole formed on a pitch circle on the end face of a rotatable shaft. , Sliding the pin on the end face until the hole position and the pin match, inserting the pin into the hole when the pin and the hole match, and rotating the rotary shaft together with the pin. Automatic hole position detection mechanism. 2. A shaft rotation stopping mechanism is provided to prevent the rotation shaft from rotating due to a frictional force generated when the pin slides on the surface of the rotation shaft when detecting a hole position. Item 1. A hole position automatic detection mechanism for an end face of a rotating shaft according to item 1. 3. The shaft rotation stopping mechanism is formed of a spring and an adjusting screw so that the stroke and the load can be adjusted, and the thrust load applied to the shaft can be controlled. Automatic hole position detection mechanism on the end face of the rotating shaft.