JPH0672970B2 - Abnormality detection device for resin molding of spiral groove - Google Patents

Description

TECHNICAL FIELD The present invention relates to a groove abnormality detecting device for detecting abnormality of a groove portion of a resin molded product having a spiral groove, for example, narrow groove width or insufficient groove depth.

<< Background of the Invention >> As is well known, since an optical fiber has a low transmission loss and an extremely large transmission amount, it has been put to practical use in the field of communication.
When laying a plurality of optical fibers into a cable, a molded product having a spiral groove for carrying the optical fibers on the outer periphery is used as a cable element.

This kind of molded product is generally called a spiral spacer, and a spiral groove is formed by a thermoplastic resin on the outer periphery of a tensile strength wire such as a metal wire or an FRP wire, and the spacer part is provided with a plastic material. However, these spiral spacers have the following problems.

That is, the plastic spacer employs a method in which the thermoplastic resin is extruded from the die while rotating to form a spiral groove on the outer periphery of the tensile strength wire, so that the groove is slid in the groove portion in the process in which the thermoplastic resin is cooled and solidified. If deformation occurs, gel-like material is ejected from the extruder, or if the eyes or ridges that grow on the die surface adhere to the groove of the spacer,
Defects such as a partially narrow groove width or a shallow groove depth may occur.

If such an abnormal portion exists, when actually used as a cable element, troubles in the cabling process such as the optical fiber cannot be stably accommodated in the groove, or even if the cabling can be done The transmission loss may increase by giving unnecessary lateral pressure to the optical fiber depending on the abnormal portion, which may affect the transmission characteristic itself of the optical fiber.

From these points, the width and depth of the spacer groove portion must strictly satisfy the dimensional accuracy specified in the standard for the entire length and all grooves.

However, conventionally, there has not been provided a device capable of measuring a molded product having such a spiral groove over the entire length thereof, or a device for detecting a groove abnormality.

In view of the above background, the present inventors have earnestly studied for the purpose of completing an apparatus capable of detecting an abnormality in the groove width and the groove depth of a molded product having a continuous spiral groove, and have completed the present invention. It is a thing.

<< Means for Solving the Problems >> In order to achieve the above object, the present invention is a groove abnormality detecting device for a resin molded product having a plurality of spiral grooves on the outer periphery, which corresponds to the groove width of the spiral groove. A plurality of pins with different diameters, a pin holder that arranges these pins in the circumferential direction, and holds the plurality of pins at the same time so that they can move forward and backward, a support that rotatably supports this pin holder, and a sticker attached to this support. And a guide roller arranged before and after the pin holder to support the molded product so that the molded product can travel to a predetermined position. And a device.

<< Examples >> Hereinafter, preferred examples of the present invention will be described in detail with reference to the accompanying drawings.

1 to 4 show an embodiment of a groove abnormality detecting device for a resin molded product having a spiral groove according to the present invention.

The detection device shown in the figure illustrates a case where the detection device is applied to a spiral spacer 10 in which six spiral grooves 10a are formed of a thermoplastic resin on the outer periphery of a tensile strength line arranged at the center, and the device is shown in FIG. It is installed on a support base 13 between a pair of rollers 12, 12 provided in the middle of the manufacturing process of the spiral spacer 10 traveling in the direction of the arrow.

The detection device includes a detection unit 14 that detects an abnormality such as the width or depth of the spiral groove 10a and converts it into an electric signal, and an electronic circuit that receives a signal from the detection unit 14 and determines whether the detection is normal or not. The means 16 and a guide roller device 18 that supports the spiral spacer 10 so that the spiral spacer 10 can travel at a predetermined position with respect to the detection portion 14 are roughly configured.

The detection unit 14 has a spiral groove 10 as shown in detail in FIG.
Six pins 20 having a tip diameter corresponding to the groove width of a and the pins 20 are arranged at equal angular intervals in the circumferential direction.
A pin holder 22 that holds 20 at the same time so that they can move back and forth only in the same amount, a pillar 26 that rotatably supports the pin holder 22 via a bearing 24, and wires that are attached to both sides of the supporting end side of the pillar 26. Or the semiconductor type strain gauges 28, 28, the column 26 is provided on the support 13 in an upright state via the mounting base 30.

The advance / retreat mechanism of each pin 20 has the following structure.

The pin holder 22 has a main body block 32 in which a through hole 31 for inserting the spiral spacer 10 is formed in the center, an intermediate block 34, and a dial block 36, and one main body block 32 has one pin 20. The concave groove 32a for accommodating each
It is provided radially at intervals of 0 degree.

On the other hand, each pin 20 has a cylindrical tapered base portion 20a, a spring material locking portion 20b protruding from the axial center of the rear end of the base portion 20a, and a base portion 20b.
And a tapered guide protrusion 20c fixed to one side surface of the guide protrusion 20c, and the tip end side of the guide protrusion 20c is a tapered surface 20d.

Each of the pins 20 has a base portion 20a whose concave groove 3 of the main body block 32 is
The guide spring 20c is fitted into the V-shaped fitting groove provided in the intermediate block 34, and the coil spring 38 for biasing the pin 20 toward the locking portion 20b is provided. It is held by fixing the intermediate block 34 and the spring holder 40 to the main body block 32 by interposing.

A female screw portion is internally provided on the inner peripheral surface of the intermediate block 34, and a female screw portion engraved on the boss portion 36a of the dial block 36 is screwed into the female screw portion.

On the outer peripheral edge of the boss portion 36a of the dial block 36, a notch portion 36b having an inclination that engages with the tapered surface 20d of the pin 20 is provided.
Is provided.

In the above structure, when the dial block 36 is rotated, it moves in the direction of the solid line arrow in FIG. 2 (a), the notch 36b pushes the tapered surface 20d in the same direction, and the pin 36
20 retreats from the center of through hole 31 while dial block
When 36 is rotated in the opposite direction, the notch 36b retracts, and the pin 20 advances toward the center of the through hole 31 by the urging force of the coil spring 38.

The pin 20 can be moved back and forth at the same time by rotating the dial block 36 and by an almost equal amount.

The structure of the discrimination means 16 is shown in FIG.

The discriminating means 16 includes a bridge circuit 16a composed of a pair of strain gauges 28, 28 and a resistor R, a constant voltage power supply 16a for applying a predetermined voltage to the bridge circuit 16a, and an amplification for amplifying the output of the bridge circuit 16a. The circuit 16c, the peak hold circuit 16d that holds the maximum output voltage value of the amplifier circuit 16c, the comparator circuit 16e that compares the output value of the peak hold circuit 16d with the reference voltage, and the comparator circuit 16e When it is judged to be high, it is composed of an alarm circuit 16f for notifying the user by voice or lamp display.

The guide roller device 18 includes a pin holder 22 holding a pin 20.
A pair of the same structure is provided before and after so that the center of the holder 22 and the center of the spiral spacer 10 are accurately aligned with each other, but the figure shows only one structure.

The guide roller device 18 supports the spiral spacer 10 from the lower surface side, a large diameter roller 18a that rotates in the vertical direction, and a pair of small diameter rollers 18b that abut on both sides of the spiral spacer 10 and that rotate in the horizontal direction. , 18b and a support post 18c that rotatably supports the rollers 18a, 18b.

In the groove abnormality detecting device configured as described above, when there is an abnormality in the groove 10a of the spiral spacer 10 such as a narrow groove portion or a shallow groove depth, the smoothness of the pin holder 22 holding the pin 20 is smoothed. Rotation is hindered, which causes the column 26 to be displaced.

When the displacement occurs, the resistance value of the strain gauge 28 changes, the balance of the bridge circuit 16a is broken, and the output fluctuates.Therefore, if the fluctuation is amplified and compared with the reference voltage, whether or not the abnormality is acceptable within the standard. Is determined.

<< Effects of the Invention >> As described in detail in the above, according to the groove abnormality detecting device for a resin molded product having a spiral groove according to the present invention, a pin having a tip corresponding to a groove width and a groove depth is provided. Is directly inserted into the groove of the molded product and the pin holder is rotated to trace the groove to detect anomalies, so anomalies can be reliably detected over the entire groove and the entire length. The size can be guaranteed.

Also, depending on the groove depth, the tip of the pin can be moved back and forth at the same time by rotating the dial screw, so multiple pins can be adjusted evenly, and fine adjustments can be made based on the results of measuring the actual dimensions of the molded product. Can be done while operating.

Further, by urging the pin toward the axial center side by the coil spring, the pin can escape outward in the range exceeding the urging force of the coil spring when the groove portion has an abnormal convex portion. Therefore, the risk of damaging the pin or the detecting portion is reduced.

[Brief description of drawings]

FIG. 1 is an overall layout view of the device of the present invention, FIG. 2 (a) is a detailed view of a detection unit, FIG. 2 (b) is a partially cutaway plan view of a pin holder, and FIG. FIG. 3 is a detailed view, FIG. 3 is a block diagram of the discriminating means, and FIG. 4 is a detailed view of the guide roller device. 10 ... Spiral spacer, 14 ... Detection unit 16 ... Discrimination means, 18 ... Guide roller device

Claims (1)

[Claims] 1. A groove abnormality detecting device for a resin molded product having a plurality of spiral grooves on the outer circumference, wherein a plurality of pins having a diameter corresponding to the groove width and the pins are arranged in the circumferential direction. A pin holder that holds the pins at the same time so that they can move back and forth, a support that rotatably supports the pin holder, a detection unit that includes a strain gauge attached to the support, and a normal or normal condition that receives the output of the strain gauge. Abnormality detection of a resin molded article having a spiral groove, characterized by having a judging means for judging an abnormality, and a guide roller device arranged before and after the pin holder to movably support the molded article at a predetermined position. apparatus.