Conveyors: power-driven – With means to facilitate working – treating – or inspecting... – Means to convey a palleted load back and forth between an...
Patent
1987-07-21
1989-01-03
Valenza, Joseph E.
Conveyors: power-driven
With means to facilitate working, treating, or inspecting...
Means to convey a palleted load back and forth between an...
1984651, 1984761, B65G 4700
Patent
active
047950218
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a turntable apparatus combining vertical with rotary motion, having a table plate which can be made to rotate according to a given program of movement, and on which there is nonrotatably mounted a vertically ascending and descending carriage which surrounds a vertically disposed rotatable cylinder projecting centrally upward from the turntable plate and has incorporated into its circumferential surface a cam groove which is engaged by at least one cam follower pin which is coupled to the carriage and which, upon a rotation of the cylinder relative to the carriage, performs a vertical displacement and transmits it to the carriage.
Such a turntable apparatus combining vertical with rotary motion is known (DE-OS 33 44 805), which serves for the cyclical picking up of workpieces in a pick-up position, for bringing them smoothly into one or more working positions, and finally for advancing them to an offbearing position at which the workpieces are taken off and further advanced. The individual positions are at different levels which can be reached by the lift mechanism constructed on the turntable.
The invention is addressed to the problem of creating a turntable apparatus combining vertical with rotary motion in which the workpieces that are to be picked up, worked, and finally carried away, are to be brought to the individual cycle positions in a position that will be at the same level but situated radially outside of the turntable plate.
Setting out from an apparatus of the kind described above, this problem is solved according to the invention in that at least one threaded spindle with a thread pitch which is not self-locking is rotatably mounted on the turntable, and is in threaded engagement each with a complementary threaded bore in the lift carriage, and at its bottom end at the table plate is coupled by an angle drive to a threaded spindle which is rotatably mounted radially parallel to the table plate surface, and which is in threaded engagement with a driver for a workpiece carriage mounted for travel radially on the table plate, the ratio between the movement of the lift carriage and the displacement of the workpiece carriage associated therewith being selected such that the workpiece carriage, by starting the maximum vertical movement of the lift carriage, can be brought to a pick-up, working and/or offbearing station directly adjoining the turntable plate outside of the radial boundary of the latter. The vertical movement of the lift carriage, therefore, unlike the known apparatus, is converted by the threaded spindles coupled to one another by an angle drive, to a movement that is horizontal and radial to the turntable and is transferred to a workpiece carriage coupled thereto.
In a first embodiment of the invention, the cylinder driving the lift carriage, and its drive, are mounted centrally on a nonrotatable part of the housing for the stepping drive of the turntable, within an opening in the rotatable table plate, and the lift carriage is divided into two lift carriage rings which are rotatable relative to one another but coupled to one another in the lifting direction of the lift carriage, the threaded spindles driving the angle drive being engaged each with a threaded bore in the radially outer lift carriage ring, while the cam follower pin or pins engaging the cam groove of the cylinder are disposed on the inner lift carriage ring.
In an alternative second embodiment, the cylinder driving the lift carriage can also be mounted on the turntable so as to rotate with the latter, a motor being associated with it by which it can be driven for rotation relative to the turntable. Each vertical threaded drive spindle then passes through a threaded bore in a component of the lift table on which at least one cam follower pin engaging the cam groove of the cylinder is disposed. Dividing the lift table into two lift table rings rotatable relative to one another is then unnecessary.
The workpiece mounting carriages or the workpiece holders or tools mounted on them can, in an adva
REFERENCES:
patent: 2852960 (1958-09-01), Brems
patent: 4285233 (1981-08-01), Swis
patent: 4291797 (1981-09-01), Ewertowski
patent: 4326624 (1982-04-01), Ewertowski et al.
patent: 4669948 (1987-06-01), Moller
Expert Maschinenbau GmbH
Valenza Joseph E.
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