Patent ID: 7431578
Filing Date: 2008-10-07
Classification: B29C

Abstract:
1. A vertical injection molding machine comprising: a retention plate having a lower portion to which an upper mold is mounted; and a turntable having an upper portion to which a lower mold forming a cavity with the upper mold is mounted, the turntable or the retention plate being moved up and down to clamp and release the upper and lower molds; wherein during operation of the vertical injection molding machine having one or more lower molds mounted on the turntable and the upper mold mounted on the retention plate, lubricant is fed periodically from a lubricant feeding device to a sliding portion of the revolving turntable to thereby maintain a substantially constant slide resistance of the sliding portion, so as to enable the repeatedly revolved turntable to stop at predetermined positions; the vertical injection molding machine further comprising: a reduction mechanism for setting a number of revolutions of the turntable and a number of revolutions of the servomotor which is a drive source of the turntable to integers; an encoder for storing the number of revolutions of the servomotor and for outputting the number of revolutions of the servomotor as a pulse; and a control means for resetting a count of the pulses output from the encoder at a timing at which the number of revolutions of the servomotor and the number of revolutions of the turntable are integers.