| 摘要 |
A bar stock guide arrangement for screw machines having a rotatably mounted fitting which has a horizontal opening for loosely passing the bar stock and guide rollers in the fitting at circumferentially spaced locations around the bar stock. The guide rollers are on roller supports which are radially slidable in the fitting and have rack teeth on their opposite sides. Weights are slidable radially in the fitting between the successive roller supports, and these weights have rack teeth on their opposite sides. Pinion gears are removably mounted in the fitting to engage the rack teeth on the roller supports and the weights so that centrifugal force on each weight produces an inward force on the neighboring roller support. Springs bias the weights radially outward.
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