Patent ID: 7981334
Filing Date: 2011-07-19
Classification: B29C

Abstract:
1. An injection molding machine composing a fixed platen, a moveable platen located on one side of the fixed platen, a plurality of tie bars provided through the fixed platen and the moveable platen with gear teeth in the middle of the tie bars and a lock nut placed around the tie bars with a shrinking opening engaging the gear teeth, wherein the injection molding machine further comprises a plurality of mold-adjusting mechanisms provided on the opposite side of the fixed platen and being respectively coaxial with the tie bars, each of the mold-adjusting mechanisms comprises: a support frame fixed to the opposite side of the fixed platen; a motor mounted to the support frame; a mold-adjusting driving wheel with one end mounted to the shaft of the motor and the opposite end mounted to the support frame; a mold-adjusting driven wheel matching the driving wheel; a positioning cylinder mounted to the frame and connected to an external hydraulic circuit, wherein the mold-adjusting driven wheel is movably mounted to a piston rod of a hydraulic cylinder; a first sensor mounted to the lock nut for sensing the engagement between the gear teeth of the tie bars and the shrinking opening of the lock nut; and a control system connected to the motor, the first sensor and the external hydraulic circuit, wherein, when the first sensor senses that the gear teeth of the tie bars fail to engage with the shrinking opening of the lock nut, the control system controls the motor to rotate; once the first sensor senses that the gear teeth of the tie bars engage with the shrinking opening of the lock nut, the control system controls the injection molding machine to operate wherein a second sensor and a warning device are provided on the driven wheel, wherein the second sensor is a limit switch, and wherein both the second sensor and the warning device are connected to the control system in such a manner that the control system controls the warning device is controlled by the control system to alert once the driven wheel is beyond the limit switch.