Manufacturing container or tube from paper; or other manufacturi – Bending – Folding
Patent
1995-04-14
1998-09-08
Rowan, Kurt
Manufacturing container or tube from paper; or other manufacturi
Bending
Folding
B65B 5710, B31F 100, B65H 4514
Patent
active
058038906
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a buckle folding machine comprising a stationary machine frame and four parallel working cylinders, which have the same outside diameter and in pairs define at least two folding nips for the material to be folded and are adapted to be rotated at the same speed by a common transmission.
PRIOR ART
In a known buckle folding machine of that kind (German Patent Specification 2, 757, 182) the four working cylinders are rotatably mounted in stationary frame plates and operatively interconnected by gears. Three of said four working cylinders are so arranged that pairs of them define two folding nips, each of which is preceded by a feeding path, in which the material to be folded is received by two parallel guide plates and which is preceded by an electromagnetically pivotally movable feed limiter, whereas the fourth working cylinder consists only of a forwarding cylinder. The feed limiters consist of pressure-applying rollers and are pivotally moved by means of electromagnets and urge the material to be folded against that working cylinder which is adjacent to the associated feeding path so that the feed movement of the material to be folded is stopped before the succeeding folding operation and the direction of movement of that portion of the material to be folded which is being fed is reversed. The two electromagnets which impart the pivotal movement to the two feed limiters are actuated by electronic control means for a control of the folding operation in dependence of the length of the folds. Those control means receive pulses from an electronic pilse generator which is synchronized with the working cylinders and the signals from stationary sensors, which sense the material to be folded and detect the leading edge of each section of the material to be folded. In that known buckle folding machine, at least two electromagnets are required for the actuation of the feed limiters and together with the guide plates defining the feed path, the sensor for detecting the material to be folded and the electonic apparatus require the machine to have a certain minimum size.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a novel buckle folding machine which is as small as possible.
In a buckle folding machine of the kind described first herein before this is accomplished in accordance with the invention in that the four working cylinders in the common transmission are provided in a rotary frame, which is rotatably mounted in the machine frame and is adapted to be rotated by a drive in order to draw in, fold, and eject the material which is to be or has been folded and in which at least one of the working cylinders revolving with said rotary frame is displaceable, that at least one of the working cylinders is adapted to be positively displaceable within the rotaty frame by means of a mechanical control device, and that means for drawing in the materials to be folded are associated with the first folding nip and arranged to cooperate with the rotaty frame during the drawing-in and folding operations.
The design in accordance with the invention provides for a mechanical control of both folding stations which are required for a zigzag fold and parallel fold by the rotating rotary frame. During an intermittent or continous rotation of the rotary frame the material to be folded is drawn in and folded and the folded material is ejected. Owing to the design in accordance with the invention the structure of the buckle folding machine is simplified and reduced in size because the parallel guide plates which define the feeding path are omitted. The feed movement of the material to be folded is arrested by a relative movement between the working cylinders, which act as buckling cylinders, and that relative movement is derived from the rotation of the rotary frame so that additional control means for actuating the feed limiters are not required. Owing to the design in accordance with the invention it is possible to fold even multi-ply material or stitched mate
REFERENCES:
patent: 3986711 (1976-10-01), Anikanov et al.
patent: 4020616 (1977-05-01), Nakajima
patent: 4218052 (1980-08-01), Noren
patent: 4403981 (1983-09-01), Wuthrich
patent: 4900002 (1990-02-01), Zechner
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