Plastic article or earthenware shaping or treating: apparatus – Preform assembly means and means for bonding of plural... – Reshaping means utilizing fluid pressure directly contacting...
Reexamination Certificate
2000-07-14
2002-11-05
Heitbrink, Tim (Department: 1722)
Plastic article or earthenware shaping or treating: apparatus
Preform assembly means and means for bonding of plural...
Reshaping means utilizing fluid pressure directly contacting...
C425S542000, C425S504000
Reexamination Certificate
active
06474976
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a film or sheet holding apparatus for setting a film or sheet disposed on a panel-shaped resin injection molded product within an injection mold for the purpose of protecting or decorating the surface of the resin molded product, or other purposes in the case where, for example, the panel-shaped resin molded product is injection-molded.
2. Description of the Related Art
Up to now, for example, in a vehicle window for an automobile, in order to make the vehicle light in weight, there has been known a lighting member made of a resin that is smaller in specific gravity than glass. However, there arises such a problem that the surface of the resin window is liable to be damaged when it is brought into physical contact with another substance. To prevent the above problem, the surface of the resin window is protected by coating a hard coat layer thereon, for example, by coating a protective film with a hard coat that is high in abrasion resistance from the viewpoint of protecting the quality of the resin window.
The above resin window is molded by insert molding. That is, as shown in
FIG. 7
, a molten resin is injected into a cavity
102
in a state where a protective film
103
, which has been cut in a size corresponding to the shape of the resin window to be molded in advance, is set on one inner mold surface (or both of inner mold surfaces) of two coupled-type injection molds
101
having vertical coupled surfaces thereof, whereby the surface of the resin window is coated with the protective film
103
simultaneously upon being molded. In this situation, in the event that the surface of the resin window is coated with the protective film
103
identical shape with or smaller in shape than the surface of the resin window as shown in the figure, the protective film
103
is held within the cavity
102
.
Under the above circumstance, up to now, as means for holding the protective film
103
on the mold surface of the injection mold
101
, as shown in
FIG. 8
, the protective film
103
is adsorbed and held by a plurality of vacuum holes
105
disposed laterally with respect to two positioning pins
104
that are located on an upper edge side of the mold surface (a resin filling inlet side) in a state that an upper edge portion of the protective film
103
is hung on those positioning pins
104
.
Note that the small holes of the protective film
103
, which correspond to the positioning pins
104
, are so formed as to be larger in diameter than the positioning pins
104
with a margin, taking into consideration the expansion of the protective film
103
due to temperature, a manufacturing variation and the efficiency of working. For that reason, there is a case in which a floating
103
a
may be produced on the molded surface of the protective film
103
, as shown in
FIG. 9A
, when the protective film
103
is adsorbed by the vacuum holes
105
after the upper end portion of the protective film
103
is hung on the positioning pins
104
. Also, as shown in
FIG. 9B
, there is a possibility that a peeling
103
b
from the positioning pins
104
is produced on a portion apart from the vacuum holes
105
after the protective film
103
is adsorbed and before closing mold, or before the molten resin is injected.
When the floating
103
a
or the peeling
103
b
occurs, there arises such a problem that the molten resin goes to a front surface side of the protective film
103
beyond the portions of the floating
103
a
or the peeling
103
b
during an injection molding process, resulting in a defective.
SUMMARY OF THE INVENTION
The present invention has been made in view of the above problems inherent in the conventional apparatus, and therefore has an object to provide a film or sheet holding apparatus for an injection mold which is capable of surely holding a film or sheet at a specific position of a mold surface of the injection mold.
In order to achieve the above object, according to the present invention, there is provided a film or sheet holding apparatus for an injection mold for holding a film or sheet on a mold surface of the injection mold consisting of two coupled molds having substantially-vertical coupled surfaces thereof, said apparatus comprising: hanging means for hanging an upper edge side of a film or sheet on an upper edge portion of the mold surface of the injection mold; and an adsorbing device that adsorbs the film or sheet onto the mold surface of the injection mold through said upper and lower vacuum opening means disposed on the mold surface of the injection mold so as to interpose said hanging means therebetween from the upper and lower sides; wherein said respective upper and lower vacuum opening means extend along an upper edge of the mold surface of the injection mold.
REFERENCES:
patent: 5776509 (1998-07-01), Ota et al.
patent: 10-24443 (1998-01-01), None
patent: 10-113933 (1998-05-01), None
Oami Kotaro
Suzumura Masaaki
Heitbrink Tim
Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
Morgan & Finnegan , LLP
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