| 摘要 |
An adjustable support for supporting bar or tube stock serving a turning machine spindle or feeder or stock support tube or the like. It includes a tube having therethrough a through-opening of infinitely variable diameter concentric with the tube center line and coincident with the work centerline of the served unit. The tube accommodates along its length a plurality of stock-supporting sections and at least one elongated longitudinally extending pusher-puller bars. Each such section is defined by a pair of pushers and a pair of opening-defining stock-supporting rings. The pushers and rings of each pair are mounted in spaced alternating disposition along the tube length. Each ring has a pair of diametrically-opposed oppositely-facing tongues, each extending outwardly from one of its sides. The rings of the pair are trunnion mounted relative to the tube with their axes disposed 90 DEG apart, and are swingable unisonly between an opened stock-non-supporting position and myriad closed stock-supporting positions. In opened position, they define a tube-through-opening of maximum diameter, and in closed positions, they define a tube-through-opening of less than maximum diameter as determined by the projection of the tongues inwardly toward the tube centerline. The diameter is variable in indirect ratio with the degree of ring angularization - the greater the angularization, the smaller the through-opening. The pushers are fixed to the pusher-puller bar or bars so as to be movable in opposite directions lengthwise of the tube. As the pusher-puller bars and pushers are driven in one direction, each pusher is moved into a contacting relationship with a respective ring, the pusher pushing its ring in a swinging through-opening defining movement on its respective axis and a supporting embracement of each tongue with the stock periphery and as driven in counter direction a connector between each pusher and its respective ring pulls the rings away from non-stock supporting positions.
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