JPH01193148A - Workpiece length detection device in insert formation system by robot - Google Patents

Abstract

PURPOSE:To dispense with stoppage of a robot, and to shorten tact time by providing a rotating deviation meter which rotates when the tip end of a workpiece retained at a plate insertion port is abutted thereon during movement of an escape plate, and by measuring the workpiece with the rotation angle. CONSTITUTION:A workpiece 12 fed from a parts feeder 11 is inserted into a workpiece insertion port 13 of an escape plate 10. Next, a rotary actuator 14 turns at 90 degrees to start escape motion, and the workpiece 12 abuts against the tip end inclination face 17a of a plate 17, and then the plate 17 is rotated. Due to the rotation angle, internal resistance changes, and output current varies by charging a specified current. Hereat, in case of a long and short workpieces, the rotation angles differ, and the difference between the lengths of workpieces come to be the difference between the amounts of current. This current amount, therefore, is electrically read out to judge inferiority in the lengths of workpieces.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a workpiece length inspection device in an insert molding system that inserts a workpiece into a mold using a robot and molds resin around it.

(Prior Art) In an insert molding system that uses a robot to insert a workpiece into a mold and mold resin around it, the workpiece inserted into the mold is required to have high dimensional accuracy. This is because there is a risk that the mold will be damaged during molding if there are variations in the dimensions of the workpiece. For this reason, it is necessary to manage the dimensions of the workpiece.

Conventionally, as shown in FIGS. 5 to 7, a robot finger 4 chucks a niscaped workpiece 3 from a parts feeder 1 to a niscape unit 2, stops once at the top of an inspection unit 5, and displaces the workpiece downward. The length was measured and then inserted into the mold 6.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional technology, the robot has to stop once in the inspection unit, making it difficult to speed up the takt time of the insert process. In this case, the movement of the robot from the Niscape unit to the inspection unit becomes wasteful, and if the defective rate of workpieces is high, there is a problem in that there is a large loss of time.

(Means for Solving the Problems) The present invention aims to solve the above-mentioned problems, and has a movement path of an escape plate that has a workpiece insertion port from a parts feeder and moves a certain amount to supply a workpiece to a robot. A rotational displacement meter is disposed inside the escape plate so that the tip of the workpiece held in the escape plate insertion port can contact and rotate, and the length of the workpiece is measured by the rotation angle of the rotational displacement meter. It is something to do.

A detailed explanation will be given below based on each embodiment shown in one figure.

FIGS. 1 and 2 show a first embodiment.

10 is a workpiece 1 fed by a straight parts feeder 11
It has an insertion opening 13 into which one 2 is inserted.

This is an escape plate that is rotated by a rotary actuator 14. 15 is a robot chuck.

Reference numeral 16 denotes a rotational displacement meter disposed in the rotation path of the escape plate 10, so that the tip of the wire 12 held in the insertion opening 13 of the escape plate 10 comes into contact with the slope 17a of the tip of the plate 17 of the rotational displacement meter 16. It has become.

Next, the effect will be explained. A workpiece 12 sent from the parts feeder 11 is inserted into a workpiece insertion opening 13 of the escape plate 10.

Next, the rotary actuator 14 rotates 90'' to perform a niscape operation. During this rotation, the workpiece 12 comes into contact with the slope 17a at the tip of the plate 17, causing the plate 17 to rotate, as shown in FIG.

This rotation angle changes the internal resistance, and by applying a constant current, the output current changes.

The rotation angle for long workpieces and short workpieces is different.

This difference in length of the workpiece results in a difference in the amount of current. This amount of current is electrically read to determine the length of the workpiece.
Determine defects.

FIGS. 3 and 4 show a second embodiment. 20 has an insertion opening 23 on one side into which one workpiece 22 fed by the linear parts feeder 21 is inserted.

It is an escape plate that slides a certain distance with an air cylinder 24. 25 is a rotational displacement meter disposed in the sliding path, and the tip of the workpiece 22 held in the insertion opening 23 of the escape plate 20 comes into contact with the slope 26a of the tip of the plate 26 of the rotational displacement meter 25.

The operation is the same as in the first embodiment except that the rotation is now linear.

(Effects) According to the present invention, the escape plate has a workpiece insertion port from the parts feeder and moves a certain amount to supply the workpiece to the robot.

A rotational displacement meter is arranged so that the tip of the workpiece held in the escape plate insertion port can contact and rotate, and the length of the workpiece is measured by the rotation angle of the rotational displacement meter, so that the workpiece can be niscaped. Since the workpiece length is detected during the inspection operation, the robot does not need to stop at the inspection unit, and the takt time can be shortened.

Furthermore, when a robot removes workpieces that have been determined to be defective, production capacity can be increased because conventionally the operations from the Niscape unit to the inspection unit are wasted, but this is no longer necessary.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the first embodiment of the present invention before inspection, FIG. 2 is a plan view during inspection, FIG. 3 is a front view of the second embodiment of the present invention, FIG. 4 is the same plan view, and FIG. 6 is a plan view of the conventional device, FIG. 6 is a pressure side view, and FIG. 7 is a front view of the inspection unit shown in FIG. 6. 10.20...Escape plate 11.21...Linear parts feeder 12.22...Work 13.23...Insertion port 14...Rotary actuator 15...Chuck 16.25...Rotation Displacement gauge 17... Plate 24... Air cylinder Figure 1 Figure 2 Figure 5 Figure 7

Claims (1)

[Claims] During the movement path of the escape plate, which has a workpiece insertion port from the parts feeder and moves a certain amount to supply the workpiece to the robot, the tip of the workpiece held in the escape plate insertion port contacts and rotates. A workpiece length inspection device in an insert molding system using a robot, in which a workpiece length is measured by the rotation angle of the rotational displacement meter.