Boots – shoes – and leggings
Patent
1989-01-19
1992-06-23
Smith, Jerry
Boots, shoes, and leggings
36447431, 36416701, G06F 1546
Patent
active
051249294
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a control circuit for controlling the linear transverse movement and the rotary movement of a blade according to the preamble of claim 1.
The German Patent 33 36 145 describes a device for manufacturing plastic bags in which a cutting blade effects a longitudinal undulatory separating cut in a continuous foil tubing web. This undulatory separating cut consists of sinusoidal curve pieces as well as straight sections. The device has a cutter head carrying the blade which can be moved in a guide tranversally to the longitudinal movement of the foil tubing web and can be rotated about an axis extending transversally to the guide. On the side opposite the blade, the cutter head has a guide pin which engages into the groove of a drum controller whose axis of rotation extends parallel to the guide. This groove determines the position of the blade in transverse direction as well as the rotating position of the blade. In this case, the rotating position of the blade is supposed to be approximately tangential to the curve piece to be cut of the longitudinally extending undulatory separating cut. Since plastic bags have different transverse dimensions and even the amplitude of the separating cut is different from bag to bag, it is necessary to supply drum controllers whose control groove is adapted to the respective width of the bag and the amplitude of the undulatory separating cut. This requires that a number of drum controllers and their spare parts be kept in stock if separating cuts for different plastic bags are to be manufactured.
It is the object of the invention to provide a control circuit of the above-noted type with which it is possible to cut longitudinally extending, repeating separating cut curves in webs whose longitudinal and transverse dimensions can be easily altered.
An embodiment is described in greater detail in the following with reference to the drawings, in which:
FIG. 1 is a curve path to be cut and composed of sinusoidal pieces and longitudinally extending straight lines as well as the path of the knife position,
FIG. 2 is a top view onto the cutting device,
FIG. 3 is a frontal view of the cutting device,
FIG. 4 is a block diagram of the control circuit,
FIG. 5 is a block diagram of a simplified version of the control circuit, and
FIG. 6 is an output diagram of the second memory storing the transverse increments.
The embodiment of the invention concerns the manufacture of longitudinally extending, undulatory separating cuts which are composed of sinusoidal curve pieces and longitudinally extending straight lines. According to FIG. 1, the separating cut consists of a first sinusoidal curve piece AB, which extends in the fourth quadrant. The adjoining sinusoidal curve pieces BC extends in the first quadrant. A longitudinally extending straight line CD adjoings said sinusoidal curve piece. Said straight line passes over into the sinusoidal curve piece DE which extends in the first quadrant and which the sinusoidal curve piece EF adjoins, which extends in the fourth quadrant. The longitudinally extending straight line FA adjoins said curve piece EF. This undulatory separating cut has a dimension W.sub.o in longitudinal direction X. The dimension in transverse direction Y is 2U. Both W.sub.o and U are variable.
The X- component of the length of the sinusoidal curve piece AB+BC and DE+EF is W.sub.1 in each case. The longitudinal dimension of the straight line CD is W.sub.2 and of the straight line FA equal to W.sub.3.
The ratio between the dimensions W.sub.1, on the one hand, and the dimensions W.sub.2 and W.sub.3, on the other hand, is given in the undulatory separating cut.
The rotating position of the blade is illustrated by the curve path A', B', C', and D', E', F'. These curves correspond to the inclination of the tangents at curve path AA. If curve AA is defined as y=f(x), then the curve A'A' corresponds to the function y'=f'(x).
According to FIGS. 2 and 3, the cutting blade 20 is disposed on the shaft 21 of a motor 22 which is carried by a slide 23. The slide 23 i
REFERENCES:
patent: 3969615 (1976-07-01), Bowers et al.
patent: 4262336 (1981-04-01), Pritchard
patent: 4415978 (1983-11-01), Craemer et al.
patent: 4493032 (1985-01-01), Johnson
patent: 4704688 (1987-11-01), Kamata
patent: 4829219 (1989-05-01), Penkar
Gordon Paul
Smith Jerry
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