JPS5917450Y2 - Misfeed detection device using optical fiber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an abnormality detection device for the next material feed for presses.

In the conventional abnormality detection method, for example, as shown in FIGS. 1 and 2 showing a progressive die layout, a material 1 is sent in the direction of an arrow 2, and a hole is first punched by a hole punch 4 attached to a die plate 3. Hole drilled, then moved and drilled 5
If the feed is correct, the pilot pin 6 will come to the same position as the spring type pilot pin 6 and the pilot pin 6 will enter the hole 5, but if the feed is incorrect and the position of the pilot pin 6 and hole 5 do not match, the pilot pin 6 is lifted first
As shown in FIG. 2, which is a detailed cross-sectional view taken along the line A-A in the figure, the ball 8 that was wetted in the upper groove 7 of the pilot pin 6 is pushed out from the groove 7 and stored in the horizontal hole provided in the die plate 3. When the push pin 10 that is being pressed is pressed and the tip of the bush pin 10 presses the limit switch 1, the limit switch 11 is activated, and the signal stops the operation of the press or controls the feed mechanism.

Therefore, in most cases, an auxiliary mechanism is used, which often causes troubles such as switch failures and electrical connection breaks.

The present invention aims to eliminate this drawback and provide an abnormality detection device that has a simple mechanism, does not require a switch, is free from failure, and is highly reliable.

To explain Fig. 3 of the drawing of an embodiment of the present invention, there is a thick part 12a fitted to the die plate 3 at the upper part of the pilot pin 6, and a thick part 12a fitted to the punch holder fixed to the lower part of the die plate. When the receiver is held down from the upper end by the spring 14 housed in the die plate 13, the pilot pin 6 and the die plate 3 penetrate from the side surface at the stepped portion 12C at the border with the narrow portion 12b. is a hole (or notch) cut through (or notch)
15, 16, and 17 are installed, and the optical fiber 18 leading to the light source and the optical fiber 19 leading to the charging element (not shown) are fitted into the holes 16 and 17, respectively, and the light is transmitted through the optical fiber 18 from the light source. When the light passes through the hole 15 (or notch) of the pilot pin 12, if it is correctly sent to the lower end of the pilot pin 12 and is aligned with the hole 20 drilled in the material, then the pilot is placed in the hole 20. Pin 12 is fitted and serves as a pilot.

Therefore, when there is material misfeed, the position of the pilot pin 12 does not match the hole 20 in the material, so the pilot pin 12 is pushed up by the material, and the horizontal hole 15 (or notch) of the pilot pin 12 is inserted into the optical fiber 14.
The position is above the position of the hole 16 where the light is inserted, and the light beam transmitted from the light source through the optical fiber 18 is cut off, and an electric signal is taken out from an externally provided charging element (not shown) to operate the press or Misfeed detection is performed by controlling the feed and issuing an alarm.

The present invention simplifies the misfeed detection mechanism and does not require a switch, improving reliability.

In particular, it eliminates the problem of vibration resistance, which is a problem when using a switch, and is safe because there is no electrical connection.

Moreover, it requires almost no space inside the mold.

Furthermore, optical fibers are lightweight and have high strength, and have the advantage that there is less risk of breakage in the connection between the movable part and the fixed part.

[Brief explanation of the drawing]

FIG. 1 shows an example of the layout of a conventional progressive die. FIG. 2 is a detailed cross-sectional view taken along the line A-A in FIG. 1, and FIG. 3 is a cross-sectional view for explaining a detection device according to an embodiment of the present invention. 1 is the material, 2 is the arrow, 3 is the die plate, 4 is the hole punch, 5 is the hole, 6 is the pilot pin, 7 is the stepped groove, 8 is the ball, 9 is the horizontal hole, 10 is the bushing pin, 11 is the limit 1
switch, 14 is a spring, 15 is a hole, 16 is a hole, 17 is a hole, 18 is an optical fiber, 19 is an optical fiber, 20 is a hole, 21
22 is a die, 22 is a die plate, 23 is a punch holder, 24 is a punch, and 25 is a notch punch.

Claims (1)

[Scope of utility model registration request] A pair of optical fibers are provided in the cross section of a hole in which a pilot pin used in the mold is housed, and the opening ends thereof face each other in the pilot pin hole, and the pilot pin advances. A misfeed detection device using optical fibers, characterized in that the pilot pin is provided with a path for a light beam that communicates the ends of the pair of optical fibers in the above-mentioned state.