JPS629406B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an insert failure detection structure for detecting insert failure of a shaft supplied to a mold in an automatic shaft insert molding machine.

An automatic shaft insert molding machine is an automatic machine that sequentially feeds shafts into a mold, embeds the shafts and molds them, and automatically creates molded products.

The present invention aims to provide a structure for detecting shaft insert defects that occur when a shaft is supplied to a mold in this type of automatic shaft insert molding machine.

Hereinafter, the insert defect detection structure according to the present invention will be specifically explained based on the illustrated embodiments.

FIG. 1 is a partial sectional view of an automatic shaft insert molding machine showing a defective insert detection structure according to the present invention. FIG. 2 is a view in the direction of the - line arrow. What is indicated by the reference numeral 1 in the figure is a part of an arm that is held fixedly in the automatic shaft insert molding machine. Four holes are bored in this arm 1, and the spindle 2 passes through each hole freely. The support shaft 2 is placed squarely on the insert plate 3,
Around each of them are coil springs 4
is wound. Both ends of the coil springs 4 are fixed to the arm 1 or the insert plate 3, respectively. The illustrated insert plate 3 has a rectangular plate shape, and a circular hole 3a is bored in the center thereof. A shaft feeding passage 3b is bored from one outer side of the insert plate 3 as shown in FIG.
b communicates with the aforementioned circular hole 3a in the center. A disk-shaped rotating drum 5 is housed in the circular hole 3a so as to be substantially inscribed therein. Shaft holding grooves 5a are formed in the axial direction on the outer periphery of the rotating drum 5 at intervals of 90 degrees, and the rotary drum 5 is rotatably supported by a central shaft 6. A gear 7 is fixed to the central shaft 6, and the gear 7 meshes with a motor gear 9 via an intermediate wheel 8. Therefore, motor 10
The rotation is transmitted to the rotating drum 5 via these gears 9, 8, and 7, causing the rotating drum 5 to rotate. The shaft 11 is fed into the shaft feeding passage 3b from the outside, and the shaft 11 is always aligned and stored in the shaft feeding passage 3b. Therefore, when the rotating drum 5 rotates, the shafts 11 enter the shaft holding grooves 5a one by one as the drum 5 rotates. Then, the rotating drum 5 stops at a fixed position. On the other hand, a protruding plate 12 is provided facing the arm 1 side of the insert plate 3, and the protruding plate 12 is made reciprocatable in the axial direction of the rotary drum 5 by appropriate means. The protruding plate 1
2, four ejecting rods 13 are erected, each corresponding to the shaft holding groove 5a of the stopped rotating drum 5. Then, the ejector plate 12 is inserted into the shaft holding groove 5a by reciprocating movement, and the shaft holding groove 5a is inserted into the shaft holding groove 5a.
It is being drawn out from within. When the ejecting rods 13 are inserted into the shaft holding grooves 5a, the shafts 11 in the shaft holding grooves 5a are simultaneously ejected by the ejecting rods 13, and the insert plates 3
They are supplied to the molds 14 provided on the other side, and are fitted into the fitting holes 14a of the respective molds 14 and held. Thereafter, for example, a synthetic resin material is poured into the mold 14 to form a molded product in which the shaft 11 is embedded.

If the ejector rod 13 pushes the shaft 11,
Assuming that the shaft 11 is not fed out, the force of the ejector rod 13 causes the insert plate 3 to move toward the mold 14 against the coil spring 4. As the insert plate 3 moves, the support shaft 2 also moves, and the length l of the portion protruding from the arm 1 becomes shorter. A phototube 15 detects the decrease in the length l. The phototube 15 is fixed on the arm 1 via a spacer 16.

Therefore, according to the present invention, a gap detection mechanism using a phototube or the like can detect a change in the gap between a fixing member such as an arm and an insert plate, and can detect a defective shaft insert. This has the advantage of preventing damage to the mold etc. and increasing safety.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a partial cross-sectional view of an automatic shaft insert molding machine showing an insert defect detection structure according to the present invention, and FIG. 2 is a view in the direction of the - line arrow. DESCRIPTION OF SYMBOLS 1... Arm which is an example of a fixed member, 3... Insert plate, 4... Coil spring which is an example of an elastic member, 11... Shaft, 14... Mold, 2...
Push-out rod, 15... phototube of gap detection mechanism.

Claims (1)

[Claims] 1. A fixing member, an insert plate supported by the fixing member, an elastic member provided between the fixing member and the insert plate, and an ejector rod that feeds the shaft held in the insert plate to the mold. and a gap detection mechanism that detects a change in the gap between the fixing member and the insert plate that occurs when a force exceeding the elastic force of the elastic member is generated during the action of the ejector rod. structure.