Patent ID: 7128563
Filing Date: 2006-10-31
Classification: B29C

Abstract:
1. A clamping device for injection molding machine, comprising: a movable mold holder having a first side coupled to a mold; a guiding unit disposed on a platform of the injection molding machine for guiding the movable mold holder mounted thereon to move in linear motion; a gear wheel member having a first engaging part at a center thereof, and a second engaging part at a periphery thereof; a screw rod unit having one end coupled to a second side of the movable mold holder, the screw rod unit penetrating and engaging the first engaging part of the gear wheel member in such a way that a rotation of the gear wheel member drives the screw rod unit to move in linear motion; a transmission unit for transmitting power of a driving source to the screw rod unit via the gear wheel member; an engaging unit having a third engaging part; a first clamping unit disposed on one side of the screw rod unit away from the movable mold holder and coupled to the engaging unit, so that the first clamping unit drives the third engaging part to engage to/disengage from the second engaging part of the gear wheel member; and a second clamping unit coupled to the first clamping unit for driving the third engaging part, such that the third engaging part engages to the second engaging part to generate a rotational torque for driving the gear wheel member and actuating the screw rod unit to engage in a pressure clamping movement for clamping; the engagement between the third engaging part and the second engaging part is relieved, and the driving source is reversed to actuate the screw rod unit such that the screw rod unit drives the movable mold holder and the mold for opening the mold.