Actuation Of Undercut-Forming Side Inserts By The Gear And Rack

In Fig. 7. 37 the gear 4 driving the racks 3 and 5 is turned by hand. The lower rack 5 is supported by pins 1. The upper rack 3 is supported by the guide used for guiding the side insert. Turning handle 9, the upper rack 3 and lower rack 5 with side inserts move two end of mold,and the side inserts are pulled out of the workpiece

Fig.7.38 configuration of mold is is fully automatic. The gear 4 driving the racks 3 and 5 can be driven by another rack 2 fixed to the mobile mold. The rack 2 can be arranged between the gear and the mold frame. It is, however, essential to prevent the rack from rubbing against the mold frame