| 摘要 |
An electric motor driven roll feed system for intermittently advancing stock into the work station of a punch press. The roll feed system is designed so that its main rotating elements have greatly reduced rotational inertia. A low inertia overall roll arrangement is characterized by two relatively small diameter cooperating feed rolls that are respectively radially supported by a plurality of light back up rollers that peripherally engage these small feed rolls at locations spaced along the operative lengths of such feed rolls. The spaced rollers thus allow the applied operational stock gripping, feeding and braking forces to be distributed over several support locations along the operative axial length of each feed roll. This new roll arrangement has self aligning and load distributing characteristics by reason of the back up rollers engaging opposed sides of each respectively associated feed roll and bearing the major portion of the operational forces received from the feed rolls at spaced locations along the operative axial lengths of the latter. Next the power drive train or transmission from the output shaft of the electric drive motor to both of the feed rolls incorporate only relatively light low inertia rotating parts such as small diameter gear pulleys and a flexible gear belt; this drive train thus eliminating the high inertia gear sets and large gear pulleys found in the transmissions of conventional electric motor driven roll feeds. The greatly reduced rotational inertia of the present roll arrangement together with the simplified and lightened drive train thus permits the use of a smaller size electric drive motor that will have a lighter and lower inertia armature which in turn further reduces the overall amount of rotational inertia of the roll feeder system.
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