JP3013582B2 - Work direction sorting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work for selecting the direction of a work by detecting the surface of a work having upper and lower surfaces formed asymmetrically by a change in back pressure of fluid pressure ejected from a nozzle of a detection head. The present invention relates to a direction sorting device.

[0002]

2. Description of the Related Art For example, in a guide roller used for guiding a magnetic tape, a roller as shown in FIGS. 5A and 5B is used. A metal cylinder 62 formed longer than this cylinder is inserted into the outer periphery of the cylinder 60, and a concave portion 64 is formed on one end surface of the metal cylinder 62. That is, in assembling the guide roller, it is necessary to convey the guide roller (referred to as a work W) which is continuously supplied in a fixed direction, and therefore, a detecting device for detecting the direction of the work W is used. I have.

[0003]

That is, the following detecting device has been proposed as a device for detecting this kind of directionality. That is, a clamp mechanism is installed above a work receiving table that is continuously separated and supplied one by one and that is naturally dropped in a vertical introduction hole by its own weight and guided. The clamp mechanism holds the work W. The work W dropped onto the work receiving table is held by a suitable holding force.

Further, a direction reversing device is provided in parallel with the clamp mechanism, and the cylinder device can rotate the direction of the work W by 180 ° together with the clamp mechanism.

[0005] The work receiving mechanism is provided with a work cradle that can move up and down on a support frame that supports the direction discriminating body. The support frame includes a cylinder device that is controlled by a control output of a control unit to move the work cradle. is set up.

The work receiving table is vertically movably supported by a support frame with a sliding cylinder supported by a bearing, and a piston rod of a cylinder device is connected to a lower end of the sliding cylinder and falls. The work W is received by the upper surface of the work receiving table raised by the cylinder device, and then clamped by the clamp mechanism.

A direction discriminating mechanism is provided below the work receiving mechanism. The tip of the direction discriminating mechanism is made to protrude upward from an opening formed in the center of the work receiving table. A cylinder device for raising and lowering the direction detection pin is attached to the lower end side. The direction detection pin is connected to the piston so as to penetrate the cylinder device. When detecting the direction of the workpiece W, a direction detection unit is provided at the lower end side of the direction detection pin. A proximity switch is provided which is elastically supported by a spring through a flange provided on the lower end side and which opens and closes according to the distance of the direction detection pin.

However, since the proximity switch is used in the direction detecting section, the sensitivity of the detecting device thus configured is apt to change, so that erroneous determination is increased, and the spring force of the direction detecting pin and the work W The relationship with the clamping force becomes delicate, the work W tends to move when the spring force is increased, and the detection pin malfunctions due to the contact resistance when the spring force is reduced. Had many difficulties, such as the inability to visually observe the condition.

It is an object of the present invention to electrically detect a change in back pressure when a fluid pressure is ejected from a nozzle of a detection head to one of the upper and lower surfaces of an asymmetrically formed work to change the direction of the work. By configuring to discriminate, it is possible to improve the detection accuracy and detect even if the detection surface of the work has a fine structure, and furthermore, a work direction selection device that can configure the structure of the device extremely simply. To provide.

[0010]

In order to achieve the above object, there is provided a transfer device for holding a work having asymmetrically formed upper and lower surfaces, continuously transferring the work, and individually positioning and stopping the work. Detecting means provided so as to be able to advance and retreat with respect to the upper portion of the workpiece, and having a detecting head at the tip thereof. The detecting means forms a flow passage inside the detecting head and communicates with the leading end of the detecting head. And a first resistance circuit branched from a pressure source to supply fluid pressure to the nozzle of the detection head is connected to a flow passage of the detection head, and the first resistance circuit and the other resistance circuit are connected to each other. A pneumatic bridge circuit configured by connecting a detector operated by a differential pressure between the first and second resistance circuits between the second resistance circuits, wherein the detection head approaches or abuts the surface of the work. Let me A change in the nozzle back pressure and detecting by the detector.

[0011]

According to the work direction selecting apparatus of the present invention,
Fluid pressure is ejected from a nozzle of a detection head to a detection surface of a work having upper and lower surfaces formed asymmetrically, and a change in back pressure of the fluid pressure is electrically detected to determine the direction of the work. Thereby, the detection accuracy is improved, and detection is possible even if the detection surface of the work has a fine structure.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an apparatus for selecting a direction of a workpiece according to the present invention. FIG. 1 is an overall side view showing one embodiment of a workpiece direction selecting apparatus according to the present invention.

In the drawings, reference numeral 10 denotes a detection head. The detection head 10 is supported by a holder 12 which moves up and down by a driving source (not shown). Head 1
A predetermined fluid pressure (air pressure) is supplied to the detection nozzle by a pipe 14 connected to the head of the zero. Reference numeral W indicates a work, and the work W is conveyed by the conveyance device 16 and is configured to stop positioning just below the detection head 10.

FIG. 2 shows a pneumatic bridge circuit diagram, in which a first resistor circuit 20 and a second resistor branch from the pneumatic source (P) 18 to supply a predetermined air pressure from the pneumatic source (P) 18. The first resistance circuit 20 includes a first throttle valve (R ₁ ) 24 and a detection head (R) connected to an end thereof.
_X ) 10 are provided, the second resistance circuit 22 is provided with a second throttle valve (R ₂ ) 28 and a variable throttle valve (R _V ) 26, and the first resistance circuit 20 and the second A of the resistance circuit 22,
A pneumatic bridge circuit is configured by connecting the reed switch 30 between B.

The reed switch 30 is composed of a cylinder chamber 32 communicated between the two resistance circuits 20 and 22, and a magnetic body inserted into the cylinder chamber 32 and moved by a differential pressure between A and B. The configured moving body 32 and the moving body 3
And a switch (not shown) for electrically detecting the movement of the second motor. In this case, the sensitivity of the reed switch 30 can be adjusted by the variable throttle valve (R _V ) 26.

Next, a modified example of the detection head for detecting the upper and lower surfaces according to the type of the work will be described. That is, FIGS. 3A and 3B are explanatory diagrams of a state in which the normal and reverse postures of the same work W are detected, and FIG.
Shows a case where the concave portion 42 is located on the upper surface of the head (a normal position), and the detection head 10 for detecting the concave portion 42
The outer diameter of the tip of the work W
Formed into a shape that can be inserted into the concave portion 42
A nozzle 38 communicating with the flow passage 36 is formed in the tip side surface of the cap 40.

In detecting the end of the work in this state, when a predetermined air pressure is supplied with the cap 40 inserted into the recess 42 of the work W, the air pressure delivered from the nozzle 38 is sealed in the recess 42. Therefore, back pressure is generated in the first resistance circuit 20 of the bridge circuit described above.

As a result, when the moving body 34 of the reed switch 30 moves to the second resistance circuit 22 side, the reed switch 30 operates and the shape of the end of the work W is detected.

FIG. 3B shows a case where a flat surface is located on the upper surface of the workpiece W (reverse position). When detecting this flat surface, the cap 40 inserted at the tip of the detection head 10 is used.
Since the air pressure sent from the nozzle 38 is discharged to the outside without resistance, the back pressure does not occur in the first resistance circuit 20 and the moving body 34 is located at the lowered position by its own weight. After the lapse of a predetermined time, the shape of the end of the work W is determined by the timer operation.

FIGS. 4A and 4B are explanatory diagrams of a state in which the normal and reverse postures of the same work W are detected.
(A) shows the case where the surface where the concave portion 54 having the center hole 44 is formed is located on the upper surface of the work W (the normal position).
In the detection head 10 for detecting the concave portion 54, a prism 50 having a center pin 48 is inserted into an enlarged hole formed at the end of a flow passage 36 formed inside the head 10, and the outer peripheral surface of the prism 50 is And the inner wall of the enlarged hole to form a ventilation hole 52.

When the end of the work in this state is detected, the center pin 48 is inserted into the center hole 44 of the work W when a predetermined air pressure is supplied. The second resistance circuit 22 of the above-described bridge circuit is sealed in the recess 54 formed at the end of the second circuit.
Back pressure occurs

Thus, when the moving body 34 of the reed switch 30 moves to the first resistance circuit 20 side, the switch is operated and the shape (normal position) of the end of the work W is detected.

FIG. 4B shows a case where a flat surface 46 is located on the upper surface of the work W (reverse position). When detecting this flat surface, the center pin 48 is brought into contact with this flat surface to form a vent hole. Since the air pressure sent out from 52 is discharged to the outside without any resistance, no back pressure is generated in the first resistance circuit 20 and the moving body 34 is located at the lowered position by its own weight, so that the reed switch 30 is operated. The shape of the end of the work W (reverse position)
Is determined.

As described above, if a minute concave or convex portion is formed at the end of the work, it is easy to replace only the tip of the detection head with one formed according to the shape of the end of the work. Can be detected.

[0025]

As is apparent from the above-described embodiment, according to the apparatus for selecting the direction of a work according to the present invention, the detecting means for detecting the end of the work forms a flow passage inside the detection head to form the flow passage. A detection nozzle provided at the tip of the detection head for communication and a first resistance circuit branched from a pressure source for supplying fluid pressure to the nozzle of the detection head are connected to the flow passage of the detection head. The detection accuracy can be improved by using a pneumatic bridge circuit configured by connecting a detector that operates by a differential pressure between the first and second resistance circuits between the first resistance circuit and the other second resistance circuit. Even if the detection surface of the workpiece has a fine structure, if the detection surface has an uneven surface, the detection can be performed by configuring the detection head to correspond to it, even if the detection surface has a fine structure. Has the effect.

The preferred embodiment of the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and various design changes can be made without departing from the spirit of the present invention. It is.

[Brief description of the drawings]

FIG. 1 is an overall side view showing an embodiment of a work direction selecting apparatus according to the present invention.

FIG. 2 is a pneumatic bridge circuit diagram showing an embodiment of a workpiece direction selecting apparatus according to the present invention.

FIGS. 3A and 3B are explanatory diagrams of a state where each end face is detected when the work is in a normal / reverse posture, where FIG. 3A is an explanatory diagram when a recess is located on the upper surface of the work, and FIG. FIG. 7 is an explanatory diagram in the case where a plane portion is located at FIG.

4A and 4B are explanatory diagrams illustrating a state in which each end face is detected when the workpiece is in a normal / reverse posture, and FIG. 4A is an explanatory diagram in a case where a concave portion is located on an upper surface in a surface where a center hole is formed; ,
(B) is an explanatory diagram in the case where a flat portion is located on the upper surface of the work.

FIG. 5 is an explanatory view of a conventional work, in which (a) is a perspective view and (b) is a cross-sectional view.

[Explanation of symbols]

Reference Signs List 10 detection head (R _X ) 12 holder 16 transfer device 18 pneumatic pressure source (P) 20 first resistance circuit 22 second resistance circuit 24 first throttle valve (R ₁ ) 26 variable throttle valve (R _V ) 28 Second throttle valve (R ₂ ) 30 Reed switch 32 Cylinder chamber 34 Moving body 36 Flow passage 38 Nozzle 40 Cap 42, 54 Recess 44 Center hole 48 Center pin 50 Square pillar 52 Vent hole 60 Column 62 Metal cylinder 64 Recess

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B23P 19/00 301 B23P 21/00 301 B23Q 17/22

Claims (1)

(57) [Claims] 1. A transfer device for holding a work having an asymmetrically formed upper and lower surface, continuously transferring the work, and individually positioning and stopping the work. A detection nozzle provided at the tip of the detection head to form a flow passage inside the detection head and communicate therewith, and a nozzle of the detection head. A first resistance circuit branched from a pressure source to supply fluid pressure to the detection head is connected to a flow passage of the detection head, and a first and a second resistance circuit are provided between the first resistance circuit and the other second resistance circuit. And a pneumatic bridge circuit configured by connecting a detector that operates by the differential pressure of the resistance circuit, and the detector head is brought into close proximity or in contact with the surface of the work to detect a change in the back pressure of the nozzle. Detect by An apparatus for selecting the direction of a workpiece, comprising: