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US 4,790,738 AGranted
Injection mold having rotatable stamper holding ring
AssigneeMeiki Co., Ltd.
InventorsShunichi Shimojo, Ikuo Asai
Life of this patent
Estimating the term…
Abstract
An injection mold for disc molding such as in the manufacture of video or audio discs. The mold has a stamper removably clamped to one mold half by a rotating stamper holding ring. Both mold halves contain a plurality of clamping pins which selectively engage and hold slots in the holding ring. By rotating the holding ring, disengagement of the ring with the pins of the mold half carrying the stamper occurs simultaneously with engagement of the ring with the pins of the other mold half. Thereby, the stamper is released and may then be replaced.
Claims9
An injection molding apparatus comprising;
- first and second mold halves having first and second mold cavities respectively therein, at least one of said first and second mold halves being movable relative to the other to open and close the mold halves;
- a stamper removably disposed in the first mold cavity;
- outer stamper holding means for holding an outer edge portion of the stamper relative to the first mold half;
- first clamping means situated in the first mold half, said first clamping means releasably engaging the outer stamper holding means for immovably fixing the outer stamper holder means and the stamper to the first mold half and disengaging from the outer stamper holding means when the stamper is changed;
- and
- second clamping means situated in the second mold half, said second clamping means engaging and holding the outer stamper holding means only when the outer stamper holding means is released from the first clamping means, said outer stamper holding means including means for selectively engaging the outer stamper holding means with one of the clamping means while disengaging the outer stamper holding means from the other clamping means.
3 more elements
Dependencies are inferred from the claim text.