JPS62275532A - Plate stock transfer/positioning method - Google Patents

Abstract

PURPOSE:To improve the positioning accuracy of a work by measuring the work total length by detecting the front and rear ends of the work transferred onto a measuring table with plural detecting means and setting the stopper position based on this measured value. CONSTITUTION:The measuring table 7 equipped with stopping sensors 11, 13 and speed reducing sensors 15 and the transfer table 5 equipped a stopper 3 are provided around a press brake 1. When a work W is carried in and the sensors 15, 11 detect the tip of the work W, the table 7 is reversed and retreated until the sensor 13 detects the rear end of the work W. When the retreating distance l of the work W is measured with this motion, the length of the work W, L=C-l is calculated from the relation with the distance C between the sensors 13, 11. Thereafter, the positioning of the work W is performed by setting automatically the position of the stopper 3 on the table 5 to L/2. In this way, the positioning accuracy of the work can be improved.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method for positioning the loading of plate materials, and more specifically, the present invention relates to a method for positioning the loading of a plate, and more specifically, a method for detecting a plurality of workpieces provided at regular intervals along the loading direction of the workpieces. The present invention relates to a method for positioning a board to carry in a workpiece by calculating the moving distance of the workpiece and determining the length of the workpiece.

[Technical background of the invention and its problems] Conventionally, in a device for bending a workpiece, such as a press brake, the workpiece is positioned using a movable stopper or the like provided on a workpiece conveyor.
Box bending was performed around the workpiece.

However, the position of the stool for positioning the workpiece had to be adjusted manually, making it impossible to save labor.

Furthermore, in order to omit manpower, a method has been adopted in which a photo sensor is provided in the carry-in device, and the length of the work is measured and positioned based on the time that the carried-in work blocks the photo sensor.

However, the above detection means detects workpieces with holes already machined,
For example, in the case of a frame-shaped workpiece, there is a problem in that it cannot be detected and malfunction occurs.

[Object of the Invention] The present invention was devised in view of the above-mentioned problems, and its purpose is to provide a plurality of workpiece detection means, determine the length of the workpiece to be carried in, and automatically set the stopper position.

As a result, it is an object of the present invention to provide a method for positioning the loading of plate materials that eliminates manual labor and improves product accuracy.

[Means for Solving the Problems] The present invention has been proposed to achieve the object, and includes providing a plurality of workpiece detection means at regular intervals along the workpiece loading direction, and detecting the workpieces when the workpieces are loaded. The workpiece is passed through the detection means on the side and stopped at the position of the detection means on the other side.
After that, the workpiece is moved back, and the workpiece is stopped at the detection means position on the workpiece carry-in side, and the length of the workpiece is determined by subtracting the distance traveled when the workpiece is retreated from the interval between the respective detection means.

[Operation] By adopting the method of the present invention, the front and rear ends of the workpiece carried into the length measuring table are detected by a plurality of detection means, the total length of the workpiece is measured, and the stopper position is set based on this measured value. Therefore, the positioning accuracy of the workpiece can be improved.

[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.

Referring to FIG. 1, in the peripheral equipment of the press brake 1 that performs bending, there is a transport table 5 equipped with a stopper 3 that centers and stops the transported workpiece W, and a transport table 5 that transports the workpiece W into the transport table 5. 1llll
It consists of a long table 7.

The length measuring table 7 is constructed by arranging a plurality of rollers 9 in parallel, but a belt conveyor or the like may also be used.

In Fig. 1, the work W is carried in from the left arrow direction,
On the length measuring table 7, a first stop sensor 11, a second stop sensor 13, and a deceleration sensor 15 for decelerating the carrying speed are arranged at predetermined intervals.

Next, the relationship between the movement of the workpiece W and each stop sensor will be explained based on the flowchart of FIG. 2.

The roller 9 of the length measuring table 7 is rotated by a drive motor (not shown), and when the leading end of the carried-in workpiece W passes the deceleration sensor 15, the roller 9 is decelerated.

When the roller 9 moves further forward and the first stop sensor 11 detects the leading edge of the work W, the roller 9 stops, and in response to this stop command, the length measuring table 7 switches to a low speed and reverses to move the work W backward.

When the second stop sensor 13 provided at the backward limit detects the trailing edge of the work W, the length measuring table 7 stops.

By this operation, the length history of the movement of the workpiece W can be measured in reverse, and the length of the workpiece L=C−A can be measured.

The length measurement is thus completed, and the calculated workpiece length is sent to the stopper 3 provided on the conveyance table 5, and its position is automatically set to L/2.

It should be noted that the stopper 3 and the conveyance table 5 have a generally known structure, and therefore a description thereof will be omitted. In addition, the second stop sensor 13
is designed not to be detected when the workpiece W is carried in and moves forward.

Although not shown, a roller 9 is used as a length measuring means for the workpiece.
The length is measured using an encoder or the like based on the rotation of the workpiece or the rotation of the motor, or it is also possible to measure the movement of the workpiece in terms of time using a timer counter.

Fig. 3 shows a length measuring means for a perforated workpiece W, which is one of the features of the present invention.
The total length of the workpiece W that has been machined can be determined by the same detection sequence as that of the length measuring means described above.

In other words, the leading edge of the work W is detected by the first stop sensor 11, and the rear edge of the work W is detected by the second stop sensor 13 due to reverse rotation, so the work is good L=C-1 and the total length can be measured. .

Note that, as described above, the second stop sensor 13 can detect only when the sub-length table 7 is reversed, so the hole 17 is Since each sensor is not overloaded, malfunctions do not occur.

Furthermore, FIG. 4 shows another embodiment, in which the press brake 1
A detection means is provided on the transport table 19 provided on the front side of the sensor, and the length measurement method is exactly the same as the method described above.

However, by detecting the trailing edge of the workpiece W by the second stop sensor 13 and transporting it by 2/2 of the workpiece W, it is possible to align the center of the workpiece W with the center of the press brake 1 and center the workpiece W.

It should be noted that it goes without saying that the embodiments described above are not limited to the embodiments described above, and that various modifications can be made without departing from the gist of the present invention. This applies to forged necks equipped with

[Effects of the Invention] As understood from the description of the embodiments above, the present invention measures the total length of the workpiece using a plurality of detection means and automatically sets the position of the stopper.

Therefore, it is possible to produce a product with high precision without requiring human labor, and in particular, it is possible to increase the length of a workpiece with holes, thereby improving product precision.

[Brief explanation of the drawing]

Fig. 1 and Fig. 3 show an embodiment of the plate material loading and positioning method according to the present invention, Fig. 'f41 is a plan view, Fig. 2 is an explanatory diagram of a flowchart, and Fig. 3 is an explanatory diagram of the operation of a perforated workpiece. . FIG. 4 is a plan view showing another embodiment. [Explanation of the symbols representing the main parts of the drawing] W...Work, 7...Length measurement table, 11...First stop sensor, 13...Second stop sensor, Agent Patent attorney Yasuo MiyoshiFigure 1Figure 4Figure 3

Claims (1)

[Claims] A plurality of workpiece detection means are provided at regular intervals along the workpiece carrying direction, and when the workpiece is carried in, the workpiece is passed through the detection means on the workpiece carrying-in side and stopped at the position of the other detection means, and then the workpiece is moved back and the workpiece is carried in the workpiece carrying-in side. A method for positioning a board for carrying in a plate material, characterized in that the length of the workpiece is determined by stopping the workpiece at the position of the detection means, and subtracting the distance traveled when the workpiece is retracted from the interval between the respective detection means.