Conveyors: power-driven – With means to facilitate working – treating – or inspecting... – Load supporting conveyor portion is retarded or stopped with...
Patent
1991-10-21
1993-04-27
Valenza, Joseph E.
Conveyors: power-driven
With means to facilitate working, treating, or inspecting...
Load supporting conveyor portion is retarded or stopped with...
1983432, 1984741, 29430, 29792, 29563, 72422, B65G 1700
Patent
active
052053920
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method and an apparatus for guiding a closed row of workpiece holders through a closed sequence of forming stations which are arranged in a stationary position in a circular shape and in which the workpiece holders are temporarily held in place and periodically transferred.
In the manufacture of mass products which pass through a row of forming stations, such as, for example, packing containers and paper cups, a row of stationary forming stations having forming tools is provided in a known method of this type (FR-B-1,376,657) which forms the basis for the wording of the claims, which forming stations have running along them a conveying member, for example a chain or a rotatable table having holders for the workpieces, which holders are stopped temporarily in the forming stations for carrying out the forming steps (FR-B-1,376,657). The transfer of the workpieces from one station to the next takes place simultaneously for all workpieces. As a result, considerable mass forces occur which impose limits on the acceleration of the operating sequence. In contrast to such a discontinuous machine operation, there are also continuously working machines in which workpiece holders which are arranged on a chain run around rotary tables on which tools are arranged. In these machines, usually only forming operations of the same type can be carried out by tools of the same type on each rotary table. A multiplicity of tools must therefore be provided in each case, when entails considerable expense. However, machines of such a type are also known in which a plurality of different series of tools are arranged on a rotary table and the workpieces are brought in succession into connection with various of these tools by the chain which carries the workpiece holders being run over an external deflection sprocket, the deflection section being selected to be so large that the workpiece holders, after-passing through the deflection section at the rotary table, reach a forming station which is of a different type from the forming position passed beforehand (FR-A-2,463,081). Since the tools in such continuously working machines are always arranged on revolving rotary tables, they are not suitable for such forming operations in which, on account of high precision or the size of the tools or for other reasons, the revolving arrangement of the tool is undesirable or impossible.
The object of the invention is therefore to provide a method of the type mentioned at the beginning which permits a stationary tool arrangement in a continuous mode of operation.
This object is achieved according to the invention in that the forming stations are constantly occupied by workpiece holders except for at least one empty forming station and the workpiece holders, which are arranged flexibility in a row and the number of which is different from the number of forming stations, are transferred in succession by means of a transfer means, revolving continuously and concentrically to the sequence of forming stations, by first of all one workpiece holder being transferred to the empty forming station, by a following workpiece holder being transferred to the forming station occupied beforehand by the first workpiece holder, etc.
Compared with the known machined described at the beginning in which all workpiece holders are transferred simultaneously, a considerable approximation to a continuous mode of operation is achieved by the invention by the workpiece holders not all being transferred simultaneously but by their being transferred individually in succession. The division of the transfer operation into a multiplicity of individual steps allocated to the respective holding positions reduces the masses to be accelerated and braked in each case to a small fraction, the continuous advance of the transfer operation from one holder position to the next providing the precondition for substantial masses, namely those parts which perform the transfer movement, to be able to be moved continuously.
Compared with the known machines mentioned
REFERENCES:
patent: 3765268 (1973-10-01), McMillan
patent: 3868867 (1975-03-01), Hoos
patent: 4697688 (1987-10-01), Kimbell et al.
Maschinenfabrik Rissen GmbH
Valenza Joseph E.
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