Plastic article or earthenware shaping or treating: apparatus – With separate apparatus cleaning means
Patent
1994-02-03
1996-04-09
Heitbrink, Tim
Plastic article or earthenware shaping or treating: apparatus
With separate apparatus cleaning means
264 39, 425226, 425562, B29C 4500
Patent
active
055056067
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a nozzle hole sealing device for an injection nozzle, which is located between a nozzle of an injection molding machine and a tool used by a robot which is combined with the injection molding machine.
2. Description of the Related Art
In a highly automated injection molding system, a robot is combined with an injection molding machine to let it perform the change of core, the unloading of a product, and the opening/closing of a gate. For this purpose, various tools are made available, and changed by attaching to and detaching from the wrist of an arm end of the robot.
On the other hand, the injection molding machine undergoes a purging process when changing a resin or color. In order for the purging to be performed efficiently by changing the resin all over the screw, however, it is preferable to initially seal the nozzle hole at the nozzle tip, apply a back pressure on the screw, and perform the measuring operation for purging while increasing the resin density. Conventionally, however, a tool for a robot designed for use in blocking the nozzle hole at the nozzle tip of injection molding machine in purging has not been available. Therefore, something like a shutter used to be placed between the fixing platen and the nozzle (Japanese Unexamined Patent Publication No. S63-185617), or a shut-off nozzle has been used. Those methods, however, have some limitations such that the space for placing the blocking tool and that the usable resins are limited. Moreover despite the fact that a robot is capable of performing various works, a separate device is needed only for purging to entail an extra cost.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a nozzle sealing device capable of blocking a nozzle hole using a robot in purging an injection molding machine.
To achieve the above object, in one mode of the present invention, a robot tool is constituted so that a nozzle sealing body having a nozzle contact area formed on one side of the body and capable of sealing a hole of a nozzle disposed at the distal end of a heating cylinder by pressing the nozzle contact area against the nozzle hole can be mounted on a robot wrist via a tool changer.
Further, in another mode of the present invention, a robot tool is constituted so that a nozzle sealing body having a nozzle contact area formed on one side of the body and capable of sealing a hole of a nozzle disposed at the distal end of a heating cylinder by pressing the nozzle contact area against the nozzle hole can be mounted on a robot wrist via a tool changer, the nozzle sealing body being provided with an engagement mechanism for engaging the body with the nozzle or the heating cylinder, and the outer surface of the nozzle or the heating cylinder being provided with a recessed or protecting portion to engage with the engagement mechanism.
Preferably, the engagement mechanism comprises a plurality of chuck claws capable of being opened/closed by power supplied from the robot side, and an engagement groove for accommodating to the chuck claws is formed in the nozzle or the heating cylinder.
Further, in still another mode of the present invention, a robot tool is constituted so that a connected body formed at the distal end of a shaft member and comprising a flat-board-shaped nozzle sealing body, having a nozzle contact area extending in the axial direction and formed on the inner surface of the body, and a guide body, opposing to the nozzle contact area and having a space between the guide body and the nozzle contact area increasing toward the distal end, is mounted to a robot wrist via a tool changer, the guide body having a recess for accommodating a nozzle or a heating cylinder, and, on the other hand, a guide flange, having an inclined surface to engage with the inner flat surface of the guide body, is formed on the outer surface of the nozzle or the heating cylinder, so that, when the shaft member is moved toward the heating cylinder in the axial dir
REFERENCES:
patent: 4416605 (1983-11-01), Konno et al.
patent: 4808355 (1989-02-01), Kamiyama et al.
patent: 4952132 (1990-08-01), Lundquist
patent: 5281374 (1994-01-01), Matsuda et al.
Hackh's Chemical Dictionary, 1969, p. 674.
Ijima Kazunari
Ito Susumu
Kouketsu Akira
Yamanaka Katsuyuki
Fanuc Ltd.
Heitbrink Tim
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