JP2000343369A - Workpiece positioning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To machine-drill workpieces up reliably at desired places by fixing them reliably with their tip pressed on a stop. SOLUTION: This workpiece positioning device comprises a stop 2 for positioning a workpiece 1 whose tip is pressed thereon, a sensor part 3 spaced, as prescribed, from the stop 2 to detect the distance to the tip of the workpiece 1 or to determine whether the workpiece 1 is in contact with the stop 2 or not, fixing means for fixedly holding the workpiece 1 pressed on the stop 2, moving means for moving the stop 2 in the feeding direction of the workpiece 1, and lifting means 30 for moving the stop 2 vertically. The sensor part 3 consists of a magnetic flux sensor emitting magnetic flux when detecting the distance to the tip of the workpiece 1. The workpiece positioning device, when connected to a machining device 40, securely fixes the workpiece 1 with the tip pressed on the stop 2, such that the machining device 40 can drill the workpiece 1 at desired places with reliability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a work positioning device for accurately positioning a work with respect to a processing device, and in particular, to detecting whether or not the work is in contact with a stopper for positioning. The present invention relates to a work positioning device provided with a sensor unit capable of performing the following.

[0002]

2. Description of the Related Art For example, a device described in Japanese Patent Application Laid-Open No. 6-305557 is known as an example of a device for detecting and stopping the position of a work. In the apparatus described in this publication, the work conveyed by the conveyor is brought into contact with a stopper to position the work.

[0003]

By the way, in the above-described apparatus, when the work is positioned by bringing the work into contact with the stopper, there is a gap between the work and the stopper.
For example, when chips or dust generated from the processing device are present, it is determined that the workpiece has been positioned even though the workpiece is not in contact with the stopper, and the subsequent processing of the workpiece cannot be performed accurately. was there. Also, when the tip of the work is sharpened and the contact area of the work with the stopper when the work comes into contact with the stopper is reduced, it is determined whether or not the work is securely in contact with the stopper. In this case, as in the above case, there is a problem that the subsequent processing of the work cannot be performed accurately.

Accordingly, the present invention has been made in view of the above circumstances, and has as its object to provide a work positioning device capable of detecting whether or not a work is securely in contact with a stopper for positioning. I have.

[0005]

According to a first aspect of the present invention, there is provided a work positioning apparatus according to the present invention, wherein a front end of a work is brought into contact with the work as shown in FIG.
A stopper 2 for positioning the work 1 is provided at a position separated from the stopper 2 by a predetermined distance, and the work 1 comes into contact with the stopper 2 by detecting a distance from the tip of the work 1. And a sensor unit 3 for detecting whether or not the operation is performed.

Here, as the work 1, for example, as shown in FIG. 3, an H-shaped steel 1 is used, but it is not limited to this. For example, as shown in FIG. 1, the stopper 2 is provided so as to protrude from the arm 6 so as to overlap the work transfer surface, and stops the transferred work 1 on a work positioning reference line in a contact state. Work 1
Any material, shape, etc. may be used as long as the tip of the work 1 is not damaged when the workpiece 1 is brought into contact. The sensor section 3 may be any sensor as long as it can detect the work 1, and is provided on the arm 6 within a range where the tip of the work 1 can be detected. The sensor unit 3 detects a distance between a tip end of the work 1 stopped in contact with the stopper 2 and a detection unit of the sensor unit 3, and the sensor unit 3 is a control unit. It is connected to the. The control unit determines that the work 1 is in contact with the stopper 2 based on a signal output when the work 1 is in contact with the stopper 2.

According to the work positioning device of the first aspect, when the tip of the work 1 comes into contact with the stopper 2, the sensor section 3 moves between the tip of the work 1 and the sensor section 3. By detecting the distance, it is possible to detect whether or not the work 1 is securely in contact with the stopper 2 for positioning.

According to a second aspect of the present invention, as shown in FIG. 2, for example, as shown in FIG. 2, the work 1 is a steel material having an inclined surface formed at a tip end thereof, and the sensor section 3 is a magnetic flux sensor 3,
The magnetic flux sensor 3 detects a distance between the magnetic flux sensor 3 and the inclined surface.

Here, the magnetic flux sensor 3 is composed of, for example, a small proximity switch with a built-in amplifier, and detects a metallic object whose magnetic flux emitted from the detection head 4 of the magnetic flux sensor 3 is within a certain range. It detects and measures the distance.

According to the work positioning device of the present invention, when the tip of the work contacts the stopper, the tip of the work interferes with the magnetic field generated by the magnetic flux sensor. The distance between the magnetic flux sensor 3 and the tip of the work 1 can be reliably detected. Therefore, it can be detected whether or not the work 1 is securely in contact with the stopper 2 for positioning.

According to a third aspect of the present invention, as shown in FIG. 2, for example, in the work positioning apparatus according to the first or second aspect, the work 1 is brought into contact with the stopper 2 against the stopper 2. A fixing means 10 for fixing in a state is provided.

Here, the fixing means 10 is provided with, for example, a chuck 5 as shown in FIG.
When it is confirmed that the work 1 is in contact with the stopper 2, the chuck 5 moves toward the work 1 and grasps the end of the work 1.
Is fixed in a state of contact with the stopper 2. Preferably, the chuck 5 is provided near the stopper 2.

According to the work positioning device of the third aspect, when the sensor section 3 detects that the tip of the work 1 is securely in contact with the stopper 2, the fixing means 10 moves Since the work 1 is fixed in a state in which the work 1 is in contact with the stopper 2, the work 1 can be reliably processed in a state in which the work 1 is in contact with the stopper 2.

According to a fourth aspect of the present invention, there is provided a workpiece positioning apparatus according to any one of the first to third aspects of the present invention, as shown in FIG. 20 is provided.

Here, as shown in FIGS. 5 and 6, for example, the moving means 20 includes a motor 21 provided on a mounting table 50 on which the stopper 2 is mounted,
1 comprises a pinion 22 attached to an output shaft of the motor 1 and a rack 23 provided on a transfer table 100 for transporting the work 1 and meshing with the pinion 22. As the table 50 moves along the transfer table 100, the stopper 2
Are moved in the conveying direction of the work 1.

According to the work positioning device of the fourth aspect, the stopper 2 is moved by the moving means 20 in the conveying direction of the work 1 as shown in FIG. Can be moved to a desired position and fixed, so that the work 1 can be positioned at a desired position.

According to a fifth aspect of the present invention, there is provided a workpiece positioning apparatus according to any one of the first to fourth aspects, as shown in FIG. 1 or FIG. 30 is provided.

Here, the up-and-down moving means 30 is, for example, as shown in FIG.
As shown in FIG. 5, the cylinder device 31 is mounted on the mounting base 50, and the piston rod 32 of the cylinder device 31 is directed downward.
By connecting the base end of the arm 6 provided with the stopper 2 to the distal end thereof, and expanding and contracting the piston rod 32, the stopper 2 moves up and down via the arm 6. ing.

According to a fifth aspect of the present invention, when the positioning is not performed, the vertical movement means 30 is operated to move the stopper 2 upward, thereby retreating from the front of the work 1. By doing so, the work 1 can be transported smoothly. When positioning the workpieces 1 having different heights, the stopper 2 can be positioned at a desired position by operating the vertical movement means 30.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a work positioning device according to the present invention will be described below with reference to FIGS. First, FIG. 1 is a side view of the work positioning device of the present embodiment. FIG. 2 is a plan view of the fixing unit 10 and the sensor unit 3 in the work positioning device of the present embodiment. FIG. 3 is a front view of the fixing unit 10 and the sensor unit 3 in the work positioning device of the present embodiment. FIG. 4 is a plan view showing the work positioning device of the present example. FIG. 5 is a front view showing the vertical moving means 30 in the work positioning device of the present example. FIG. 6 is a plan view showing the moving means 20 in the work positioning device of the present example.

In the work positioning apparatus of this embodiment, as shown in FIGS. 2 and 3, the tip of the work 1 is brought into contact with the stopper 2 for positioning the work 1 and is separated from the stopper 2 by a predetermined distance. And a sensor unit 3 which is provided at a position and detects whether or not the work 1 is in contact with the stopper 2 by detecting a distance from the tip of the work 1. .

The stopper 2 is provided at the tip of the arm 6.
The H-shaped steel 1 as the work 1 is provided so as to protrude from the side of the arm 6.
The abutment is adapted to abut. This H-beam 1
Is used, for example, as a beam of a building, and has an inclined surface 1a formed at the tip thereof. The sensor unit 3 is provided below the stopper 2 with the work (H-section steel).
1, the sensor unit 3
The detection surface 3a at the tip of is located slightly to the left in FIG. 3 from the contact surface of the stopper 2.

The sensor section 3 is a magnetic flux sensor 3,
A detection head 4 that emits magnetic flux is provided at the tip. The magnetic flux sensor 3 is connected to a control unit (not shown). The control unit determines that the work 1 is in contact with the stopper 2 based on a signal output when the work 1 is in contact with the stopper 2. In the magnetic flux sensor 3, when the tip of the work 1 contacts the stopper 2, the tip of the work 1 interferes with the magnetic field generated by the magnetic flux sensor 3,
Thereby, the distance between the magnetic flux sensor 3 and the tip of the work 1 can be reliably detected. Therefore, the work 1 is attached to the stopper 2 for positioning.
Can reliably be detected as to whether or not the contact is made.

FIG. 2 shows a work positioning device according to this embodiment.
From FIG. 6 to FIG.
The fixing means 10 for fixing the workpiece 2 in a contact state, the moving means 20 for moving the stopper 2 in the conveying direction of the workpiece 1, and the vertical moving means 30 for vertically moving the stopper 2 are provided. I have.

The fixing means 10 comprises a chuck 5 and a cylinder device 14 for operating the chuck 5. The chuck 5 is rotatably attached to the distal end of the stopper 2, and the workpiece 1 is pressed against the stopper 2 by pressing the workpiece 1 against the distal end of the arm 6 at the distal end. It is designed to be fixed in contact. The cylinder device 14 includes a cylinder 11, a piston rod 12, and a spring 13. The cylinder 11 is attached to a base end of the chuck 5. The piston rod 12 faces the arm 6 side, and when the piston rod 12 is extended, the chuck 5 rotates so that the distal end thereof approaches the distal end of the arm 6. . The spring 13 is hung on the arm 6 and the cylinder 11, and is disposed so as to bias the base end of the chuck 5 toward the arm 6.

In the fixing means 10, when the magnetic flux sensor 3 confirms that the work 1 is in contact with the stopper 2, the cylinder device 14
The piston rod 12 extends and pushes the arm 6, whereby the chuck 5 rotates counterclockwise in FIG. 4 against the urging force of the spring 13, and the tip of the workpiece 1 Is pressed against the distal end of the arm 6 so that the work 1 is fixed in contact with the stopper 2. On the other hand, when the piston rod 12 is retracted, the chuck 5 rotates clockwise by the urging force of the spring 13, and its tip is separated from the tip of the arm 6 to release the work 1 from being fixed. It has become.

The moving means 20 includes a motor 21 provided on a mounting table 50 on which the stopper 2 is mounted, and a pinion 22 mounted on an output shaft of the motor 21.
And a rack 23 that is provided on a transfer table 100 that transfers the work 1 and meshes with the pinion 22. As shown in FIGS. 5 and 6, a pair of upper and lower rails 10 extending in the transport direction (the direction perpendicular to the plane of FIG. 5) is provided on the side surface of the transport table 100.
On the other hand, sliders 101, 101 slidable on the rails 102, 102 are attached to the mounting base 50. The arm 6 is mounted on the mounting base 50, and the stopper 2 is provided at the tip of the arm 6. As described above, the mounting table 50 is moved in the transfer direction of the transfer table 100.
(Transfer direction of work 1)
The stopper 2 attached to the mounting base 50 via the arm 6 is movable in the direction of transporting the work 1. In the moving means 20, when the motor 21 is started, the mounting table 50 is connected to the rail 10 via the pinion 22 and the rack 23.
2, the stopper 2 moves in the transport direction of the work 1. The motor 21 is connected to a control unit (not shown), and the control unit controls the rotation of the motor 21 so that the stopper 2 can be moved to a desired position.

The vertical moving means 30 is constituted by a cylinder device 31 mounted on the mounting base 50. That is, a support table 60 is erected on the mounting table 50, and the cylinder device 31 is fixed to the support table 60 with the piston rod 32 facing downward. The base end of the arm 6 is connected via a connecting member 33. Also,
A pair of left and right rails 61, 61 extending in the up-down direction is fixed to the support base 60.
Sliders 62, 62 slidable on the rails 61, 61 are attached to the base end of the slider. As described above, the arm 6 can move up and down along the rail 61, whereby the stopper 2 attached to the distal end of the arm 6 can move up and down. The vertical movement means 30 causes the arm 6 to move up and down along the rail 61 when the cylinder device 31 is activated and the piston rod 32 moves up and down, whereby the stopper 2 moves up and down. It is supposed to. The cylinder device 31 is connected to a control unit (not shown). The control unit controls the vertical movement of the piston rod 32 so that the stopper 2 can be moved to a desired height. .

Next, the operation of the work positioning device having the above configuration will be described. First, the work positioning device is moved to the processing device 40 side by activating the motor 21 of the moving means 20, and is stopped at a predetermined position. Here, the processing device 40 is a punching device 40 in this example, and a pair of punches 41, 41 that move up and down.
Thus, a pair of through holes are formed in the web 8 of the H-section steel (work) 1.

Thereafter, the work 1 is conveyed to the processing device 40 from the previous process, and the leading end of the work 1 comes into contact with the stopper 2 of the work positioning device of this embodiment and stops. At this time, the magnetic field generated by the magnetic flux sensor 3 is interfered by the work 1, and the magnetic flux sensor 3 detects the distance between the magnetic flux sensor 3 and the tip of the work 1,
If the detected distance is correct, the magnetic flux sensor 3 outputs a signal to the control unit. Then, a control unit connected to the magnetic flux sensor 3 determines whether the work 1 has contacted the stopper 2 based on an output signal from the magnetic flux sensor 3.

The control unit connected to the magnetic flux sensor 3 controls the magnetic flux sensor 3 if the distance between the tip of the work 1 and the detection head 4 actually detected by the magnetic flux sensor 3 is correct. From the signal output from
For example, it is determined that the tip of the work 1 is securely in contact with the stopper 2 without any chips or dust generated from the processing device 40 interposed between the work 1 and the stopper 2. . When it is determined that the tip of the work 1 is in contact with the stopper 2, the piston rod 12 of the cylinder device 14 is extended and pushes the arm 6, whereby the chuck 5
4 by rotating counterclockwise in FIG. 4 against the urging force of the work 3 and pressing the work 1 against the front end of the arm 6 at the front end thereof. Make sure it is fixed in contact with it. After that, the work 1 is reliably subjected to a boring process at a desired position by the processing device 40.

On the other hand, if the distance between the tip of the work 1 and the detection head 4 actually detected by the magnetic flux sensor 3 is not correct, the control unit connected to the magnetic flux sensor 3 Since no signal is output from the magnetic flux sensor 3, between the workpiece 1 and the stopper 2,
For example, it is determined that chips or debris generated from the processing device 40 are interposed and the tip of the work 1 is not securely in contact with the stopper 2, and for example, an alarm or a lamp is turned on. To inform the worker.

When the work 1 is perforated, the stopper 2 is raised by the vertical movement means 30, and the stopper 2 is retracted from the front of the work 1. The work 1 is transported forward by the table 100. Further, when it is desired to position the tip of the work 1 at a position in front of the transfer table 100, as shown by a two-dot chain line in FIG.
Then, the work positioning device is moved forward, and thereafter, the tip of the work 1 is brought into contact with the stopper 2 in the same manner as described above, thereby positioning the work 1. As described above, the work positioning device of this example can reliably position the work 1 at a desired position.

[0034]

As described above, according to the work positioning apparatus according to the first aspect of the present invention, when the front end of the work comes into contact with the stopper, the sensor section moves between the front end of the work and the sensor section. By detecting the distance, it is possible to detect whether or not the work reliably contacts the stopper for positioning.

According to the work positioning device according to the second aspect of the present invention, when the front end of the work contacts the stopper, the front end of the work interferes with the magnetic field from the magnetic flux sensor,
This makes it possible to reliably detect the distance between the magnetic flux sensor and the tip of the work. Therefore, it can be detected whether or not the work is securely in contact with the stopper for positioning.

According to the work positioning device according to the third aspect of the present invention, the same effect as that of the first or second aspect can be obtained, and the tip of the work can be securely connected to the stopper by the sensor. When it is detected that the workpiece is in contact with the stopper, the fixing means fixes the workpiece in a state in which the workpiece is in contact with the stopper, so that the work can be reliably processed in a state in which the workpiece is in contact with the stopper.

According to the work positioning device according to the fourth aspect of the present invention, the same effects as those of the first to third aspects can be obtained, and the stopper is moved by the moving means as shown in FIG. In addition, since the front end of the work can be moved to a desired position and fixed by moving the work in the transfer direction of the work, the work can be positioned at a desired position.

According to the work positioning apparatus according to the fifth aspect of the present invention, the same effects as those of the first to fourth aspects can be obtained, and when the positioning is not performed, the vertical movement means is operated. By doing so, by moving the stopper upward and retracting from the front of the work, the work can be transported smoothly.

[Brief description of the drawings]

FIG. 1 shows an example of a work positioning device according to the present invention, and is a side view of the work positioning device.

FIG. 2 is a plan view of a fixing unit and a sensor unit in the work positioning device.

FIG. 3 is a front view of a fixing unit and a sensor unit in the work positioning device.

FIG. 4 is a plan view showing the work positioning device.

FIG. 5 is a front view showing vertical movement means in the work positioning device.

FIG. 6 is a plan view showing moving means in the work positioning device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Work 2 Stopper 3 Sensor part (magnetic flux sensor) 10 Fixing means 20 Moving means 30 Vertical moving means

Claims (5)

[Claims] A stopper for positioning the work by contacting the tip of the work, and a stopper provided at a predetermined distance from the stopper to detect a distance from the tip of the work. And a sensor unit for detecting whether or not the work is in contact with the stopper. 2. The work positioning device according to claim 1, wherein the work is a steel material having an inclined surface formed at a front end portion, and the sensor section is a magnetic flux sensor, and the magnetic flux sensor is formed of the magnetic flux sensor and the magnetic flux sensor. A work positioning device for detecting a distance from an inclined surface. 3. The work positioning apparatus according to claim 1, wherein said stopper is provided with fixing means for fixing said work in contact with said stopper. . 4. The work positioning apparatus according to claim 1, further comprising: a moving unit configured to move the stopper in a direction in which the work is transported. 5. The work positioning apparatus according to claim 1, further comprising a vertical movement means for moving said stopper up and down.