MOLD DRIVING SHAFT FRICTION CLAMP
The object of the friction clamp is to prevent the mold disk from vibrating when advancing to the casting or ejecting position, and is found attached to the mold driving shaft and held by a pin in the mold gear arm. The lost motion in several pinions from which the mold disk gets its action, will cause the disk to vibrate when stopping ready to advance on the vise stud blocks, unless it is held by the clamp which acts as a brake.
When the mold disk has made the one-quarter and three-quarter revolutions it must remain in that position, or the locking studs, coming in contact with the rims of the stud block, would wear.
The friction clamp which overcomes the vibration is made in two sections, with a leather lining, and connected to the mold turning shaft. A spring, washer, and lock nut add to its construction. The pin in the mold gear arm to which it is also connected prevents it from turning with the shaft. Do not have more friction than necessary, for if there is too much, the main clutch could not drive the machine, as the strong friction on the clamp would overcome the pull of the clutch spring.