Patent ID: 7866363
Filing Date: 2011-01-11
Classification: B31F,B32B

Abstract:
1. A hold-down structure installed in a machine base of a machine and adapted for compacting a workpiece being transferred by said machine, said hold-down structure comprising: a conveyer unit, said conveyer unit comprising an upper conveyer means, a lower conveyer means spaced below said upper conveyer means, a transfer path defined between said upper conveyer means and said lower conveyer means through which said workpiece is transferred, said upper conveyer means comprising of a circulating endless transfer belt and a plurality of rollers rotatable to move said circulating endless transfer belt; and a pressure unit, said pressure unit comprising front and rear pairs of upright supports arranged at two opposite lateral sides relative to said conveyer unit, and multiple linked series of pressure blocks arranged in parallel and suspending between said front and rear pairs of upright supports and pressed on a top surface of a lower part of said circulating endless transfer belt of said upper conveyer means to give a downward pressure to said lower part of said circulating endless transfer belt of said upper conveyer means against said workpiece, wherein said pressure unit further comprises a controllable lifter to selectively lift said pressure blocks from the top surface of said lower part of said circulating endless transfer belt of said upper conveyer means, said lifter comprising two tracks arranged in parallel at two opposite lateral sides relative to said upper conveyer means and extending in a direction corresponding to said transfer path, two carts respectively mounted in and movable along said tracks, and a lifting block transversely set between said linked series of pressure blocks and said lower part of said circulating endless transfer belt of said upper conveyer means and connected between said two carts for lifting said selected pressure blocks from said lower part of said circulating endless transfer belt of said upper conveyer means.