Method and device for forcibly inserting drop into compression molding machine, and molding die follow-up type method and device for supplying drop

Patent metadata

Field	Value
Publication number	US-9492949-B2
Application number	US-56444504-A
Country	US
Kind code	B2
Filing date	Jul 13, 2004
Priority date	Jul 14, 2003
Publication date	Nov 15, 2016
Grant date	Nov 15, 2016

Abstract

When compression molding is performed continuously, lumps of molten synthetic resin (drops), which are supplied by extrusion, are continuously, accurately, and rapidly inserted into plurality of compression molding dies which are rotatingly movable. A method and device for continuously supplying drops into female moldings which are rotatingly movable for manufacturing moldings, wherein synthetic resin in molten condition extruded from an extrusion opening is cut by a cutter attached to a holding mechanism to form the molten resin into drops in a determined quantity, the drops are held and conveyed by the holding mechanism, and the drops are forcibly inserted and supplied into the concaves of the female moldings. At that time the holding mechanism on the rotary-and movable type drop supply is made to approach the rotating molding die and the rotation path of the holding mechanism is made to overlap with that of the molding die within a determined area to make the movement of the holding mechanisms follow that of the molding die.

First claim

The invention claimed is:

1. A method of supplying a drop to a compression molding machine comprising:
moving a molding die along a first path, the first path being a circular endless path;
moving a holding mechanism along a second path, the second path being an endless path abutting the first path in a plain view;
making the holding mechanism vary a rotation radius or oscillate such that a portion of the second path elastically conforms to the first path and that the first path and the second path coincide in a plain view over a distance thereby making a following zone;
synchronizing the movement of the molding die and the movement of the holding mechanism in the following zone;
carrying the drop by the holding mechanism to the following zone; and
transferring the drop from the holding mechanism to the molding die in the following zone,
wherein the holding mechanism supplies the drop into the molding die.

2. The method of supplying a drop according to claim 1 , wherein, in the transferring step, the drop released from the holding mechanism is forcibly inserted into a concave of the molding die.

3. The method of supplying a drop according to claim 1 , wherein a plurality of holding mechanisms is used, the first path is a rotary path, and the compression molding machine has a plurality of the molding dies.

4. The method of supplying a drop according to claim 1 , wherein the holding mechanism moves along a guide by a cam provided outside and a cam follower integrated with the holding mechanism.

5. The method of supplying a drop according to claim 4 , wherein the holding mechanism follows the position of the molding die by oscillation when the holding mechanism is made to approach the rotating molding die.

6. The method of supplying a drop according to claim 4 , wherein the holding mechanism is supported by a support, the support is biased outward with respect to a wheel on which the holding mechanism is attached, the cam follower abutting on the cam is set so that the holding mechanism does not move outward from its position, the support moves along the guide whose angle is varied to set at a specific angle toward a normal line so that, while the support moves along the guide, the holding mechanism abuts the die and approaches the molding die.

7. The method of supplying a drop according to claim 1 , wherein the holding mechanism is supported by a fixing member moved on the second path around an eccentric circle, a moving path of the fixing member is controlled by a controlling guide provided on the path of the fixing member.

8. The method of supplying a drop according to claim 7 , wherein the holding mechanism is supported by a conveyer going around two separate circles, the second path of the holding mechanism conforms and coincides in a plain view with the first path of the molding die making the second path into a shape of a portion of a circular path concentric with the circular path of the first path traced by the molding die.

9. The method of supplying a drop according to claim 8 , wherein the holding mechanism is supported by a support, the support is biased outward with respect to a wheel on which the holding mechanism is attached, a cam follower abutting on a cam is set so that the holding mechanism does not move outward from its position, the support moves along the guide, while the support approaches the rotating molding die, the rotation path of the holding mechanism conforms and coincides in a plain view with the first path of the molding die within the following zone.

10. The method of supplying a drop according to claim 7 , wherein the path around the eccentric circle is a path formed by vertical or horizontal rotation.

11. The method of supplying a drop according to claim 1 , wherein control is performed to adjust the moving rate of the holding mechanism to that of the molding die in the following zone.

12. The method of supplying a drop according to claim 1 , wherein the molding which is molded in the compression molding machine is a preform.

13. The method of supplying a drop according to claim 4 , wherein the holding mechanism is supported by a fixing member moved on the second path around an eccentric circle, a moving path of the fixing member is controlled by a controlling guide provided on the path of the fixing member or the cam within the following zone.

Assignees

• Nemoto Satoru
• Kimura Yoshihiko
• Itou Ken
• Takano Shoichiro
• Hashimoto Hiroyuki
• Sasaki Masayuki
• Toyo Seikan Group Holdings Ltd

Inventors

• Nemoto Satoru
• Kimura Yoshihiko
• Itou Ken
• Takano Shoichiro
• Hashimoto Hiroyuki
• Sasaki Masayuki

Classifications

• B30B11/12

  co-operating with moulds on the circumference of a rotating drum · CPC title

• B29C2043/3411

  mounted onto arms, e.g. grippers, fingers, clamping frame, suction means · CPC title

• B29C31/048 Primary

  the material being severed at the dispensing head exit, e.g. as ring, drop or gob, and transported immediately into the mould, e.g. by gravity · CPC title

• B29C43/34

  Feeding the material to the mould or the compression means {(B29C43/085 takes precedence)} · CPC title

• B29C43/08

  with circular movement {, e.g. mounted on rolls, turntables} · CPC title