JPS6310209A - Device for stopping mobile member at fixed position - Google Patents

Abstract

PURPOSE:To set the stopping position of an approximation switch with high accuracy in case the switch is moved vertically to a reference axis, by tilting the detecting plane of a detecting member opposite to the reference plane of the approximation switch against its moving direction. CONSTITUTION:An approximation switch 11 is fixed so that its reference axis 11a is set orthogonal to the moving direction P. While a detecting member 12 opposite to the reference plane 11b of the switch 11. Then the detecting plane 12a corresponding to the plane 11b is tilted so that the vertical distance between both planes 11b and 12a is gradually decreased toward the direction P. In such a constitution, said vertical distance is varied by the mutual movements of the switch 11 and the member 12. That is, y=xtantheta is satisfied among a horizontal shift distance (x), a vertical shift distance (y) and the sloping angle theta of the plane 12a against a horizontal plane respectively. Then the stopping accuracy of the switch 11 is improved with increase of the angle theta.

Description

Detailed Description of the Invention (Industrial Application Field) This invention is a method for detecting and stopping a moving member transported along a rail without contact when it reaches a predetermined position. Regarding a device for stopping a member in a fixed position, it is used when a part or the like is attached to or removed from a moving member at a predetermined position.

(Prior Art) As a means for detecting a moving member without contacting it and stopping it at a predetermined position, as shown in FIGS. 4 and 5,
One using a proximity switch is known. In FIG. 4, 1 is a proximity switch, which is fixed to a moving member (not shown) that moves up and down vertically so that its reference axis 1a is oriented vertically and the reference surface 1b is horizontal. On the other hand, a detection member 3 having a flat upper surface is fixed to a fixed member 2 such as a frame so as to face the base surface 1a of the proximity switch 1, and as the movable member descends, the proximity switch 1 moves above the detection member 3. Proximity switch l when approaching the specified position
gives a signal and the descent stops. FIG. 5 shows a case where a movable member (not shown) moving in the horizontal direction is stopped at a plurality of locations, in which the proximity switch 1 is fixed to the movable member with the reference axis 1a vertically oriented, while the fixed member A long detection member 4 having an upwardly projecting rectangular convex portion 4a with a flat upper surface is fixed to the proximity switch l which moves horizontally.
When the reference surface 1b faces the convex portion of the detection member 4, a signal is generated and the horizontal movement of the moving member is stopped.

(Problems to be Solved by the Invention) As shown in FIG. 4, when the proximity switch 1 is moved in the direction of the reference axis 1a and the reference surface 1b is opposed to the detection member 3, However, when the proximity switch 1 was moved in a direction perpendicular to the reference axis 1a as shown in FIG. 5, the accuracy of the detected position was extremely low.

This invention allows the stop position to be set with extremely high accuracy when the proximity switch 1 is moved in a direction perpendicular to the reference axis 1a.

(Means for Solving the Problem) It consists of a fixed member provided with a guide rail and a movable member that is transported along the guide rail, and a proximity switch 11 is attached to one of the fixed member and the movable member as a reference. Axis 11
a is fixed so that it is perpendicular to the moving direction, and a detection member 12 facing the reference surface 11b of the proximity switch 11 is fixed on the other side, and when the detection member 12 reaches the operating area of the proximity switch 11, this In a moving member fixed position stopping device configured to stop a moving member, a detection surface 12a corresponding to the reference surface 11b of the detection member 12,
The reference plane and the detection plane are tilted so that the vertical distance between them becomes gradually narrower along the direction of movement.

(Function) Since the detection surface 12a is inclined with respect to the moving direction (direction of arrow P), the reference surface 11b of the proximity switch 11 and the detection surface of the detection member 12 are separated by mutual movement between the proximity switch 11 and the detection member 12. The vertical distance between changes. That is, the horizontal movement distance is χ, the vertical movement distance is y, and the detection surface 1
If the inclination angle of 2a with respect to the horizontal plane is θ, then y=χt
The relationship anθ is obtained.

Precision is improved by setting the inclination angle θ to a large value.

(Example) In FIGS. 2 and 3, a guide rail 13 that is long in the width direction (left and right direction in FIG. 2) is fixed on the fixed member IO, and the movable member 14 is slidable on this guide rail 13. Fits in. This moving member 14 is connected to an upper main unit (not shown) via a transmission bar 15 protruding from the upper end, and as the main unit moves, the guide rail 13
It is designed to perform accurate linear motion along the . Further, an arm 16 extending forward (to the left in FIG. 3) is fixed to the upper surface of the moving member 14, and the proximity switch 2 is provided at a position slightly retreating from the tip of this arm 16 so as to face it. . A shielding plate 17 extending forward and to the left and right sides is fixed to the lower surface of the tip of the arm 16, and a high-frequency oscillation type proximity switch 11 is installed between the shielding plate 17 and the movable member 14 so that the reference axis 11a is vertical and the reference plane It is fixed with 11b facing downward.

On the other hand, a plywood 18 long in the width direction is fixed on the fixing member 10 so as to be located below the portion through which the proximity switch 11 passes, and a detection member 19 is fixed on the upper surface of this plywood 18. This detection member 19 is formed in a plate shape long in one width direction, and as shown in FIG.
9a and an inclined part (detection surface) inclined with respect to the movement direction
19b and a horizontal thin section 19c on the right side. A deceleration proximity switch 21 is fixed to the center of the front surface of the base plate 18 via a bracket 20 so as to face the shielding plate 17 with the reference surface 21a facing upward.

In the above structure, when the moving member 14 moves in the direction of arrow P and the left end of the shielding plate 17 reaches above the deceleration proximity switch 21, the traveling speed of the main unit is decelerated. When the object reaches the inclined detection surface 19b of the detection member 19, the main unit is stopped by a signal transmitted from the proximity switch 11, and accordingly, the moving member 1
4 stops.

High frequency oscillation type proximity switch 11 (AH manufactured by Reed Electric Co., Ltd.
-110) is attached to the moving member 14, the length D of the detection surface 12a of the detection member 12 is 15+am, and the slope of the detection surface 12a is 1/15. The distance S between the reference surface 11a and the detection surface 12a is 0.
．． 3m*, and the moving member 14 is fed at a speed of 2.5+m.
/second, the error in the stopping position was ±O, 15n.
It was n. On the other hand, when the movable member 14 was transferred under the same conditions as described above except for using the detection member 4 shown in FIG. 5, the error in the stop position was ±0.5 mm.

In the above embodiments, the proximity switch 11 may be of the high frequency oscillation type, or may be of the ultrasonic type, mechanical type, inductive bridge type, capacitive type, or the like.

Further, in the above embodiment, the proximity switch is attached to the moving member and the detection member is attached to the fixed member, but conversely, the detection member may be attached to the moving member and the proximity switch is attached to the fixed member.

(Effects of the Invention) In this invention, since the detection surface of the detection member facing the reference surface of the proximity switch is inclined with respect to the movement direction, the displacement in the direction perpendicular to the reference axis is measured in the direction of the reference axis. It can be converted into a displacement and measured, so that variations in the stopping position of the moving member are extremely small.

[Brief explanation of the drawing]

Fig. 1 is an enlarged view of the main parts of the embodiment of the present invention, Fig. 2 is a front view of the embodiment, Fig. 3 is a right side view of Fig. 2, and Figs. 4 and 5 are a front view of the conventional device. It is a diagram. 10: fixed member, 11: proximity switch, 12: detection member, 12a: detection surface, 13: guide rail, 14: moving member, 19: detection member, 19b: detection surface. Patent applicant Toyobo Co., Ltd. agent Patent attorney Takeshi Sakano Misspoken words 1) Tsukasa Ryo

Claims (1)

[Scope of Claims] [1] Consisting of a fixed member provided with a guide rail and a movable member that is transported along the guide rail, a proximity switch is mounted on one of the fixed member and the movable member, the reference axis of which is The moving member is fixed so as to be perpendicular to the moving direction, and a detecting member facing the reference surface of the proximity switch is fixed on the other side, and the moving member is stopped when the detecting member reaches the operating area of the proximity switch. In the fixed position stopping device for a moving member, the detection surface of the detection member facing the reference surface is inclined so that the vertical distance between the base surface and the detection surface gradually becomes narrower along the moving direction. A fixed position stopping device for a moving member, characterized in that: