Pallet changing device for a machine tool and machine tool comprising a pallet changing device

摘要

A pallet changing device (40) for changing pallets on a machine tool comprises a changing device (15) including connecting elements (26, 28) for releasably connecting the pallet changing device (40) to pallets (7, 8), a rotational drive (19) for rotating the changing device (15) in a working plane (18), and a lifting device (20) for raising and lowering the changing device (15) and thus the working plane (18) within a workspace (21). The rotational drive (19) is arranged outside the workspace (21).

主权项

1. A pallet changing device for changing pallets for supporting workpieces on a machine tool, comprising:
a changing arm comprising two ends, each of the ends comprising a respective connecting element for releasably connecting the pallet changing device to a respective one of the pallets; a rotatable column, to the outside of which a spur gear is attached at a lower portion of the column, and on which rotatable column the changing arm is supported for rotation about a longitudinal axis of the column; a rotational drive assembly for rotating the changing arm and the column about the longitudinal axis, wherein the rotational drive assembly includes a motor, and also includes a pinion that is operationally connected to the spur gear in such a way that when the pinion is rotated by the motor, the spur gear is rotated, and thus the rotatable column and changing arm are rotated about the longitudinal axis of the column; and a lifting device for raising and lowering the changing arm and the column and the spur gear, and a guide structure for guiding the raising and lowering of the column, which guide structure comprises a stop against which an upper face of the spur gear strikes to impede the upward progress of the column being raised by the lifting device.