Sewing – Work manipulating – Guides
Patent
1980-12-24
1983-06-28
Nerbun, Peter P.
Sewing
Work manipulating
Guides
D05B 302
Patent
active
043899536
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a sewing machine with electronic pattern data circuits for the generation of signals which, converted into movements of the stitch-forming elements of the machine, are used for carrying out fancy seams.
Within the art of electronic pattern data circuits for sewing machines, several systems have been developed for the generation of control signals. Such a typical system may include a set of rather obvious units and be composed as follows: There is a memory unit, in which the patterns are stored so that every position of the needle in the transverse direction corresponds to a digital code word in the memory. Circuits of this kind must include an address counter in order to make the addressing of the successive needle positions run forwards, which counter is stepped by pulses in synchronism with the running of the machine. The address counter is supplied with the address (start address) of the selected pattern. Such a start address is carried out by an input selector, e.g. a set of change-over switches, and a logic circuit for supplying a digital input signal to an address memory and the like. The address counter then releases the code words for every one of the following stitches out of the memory. In addition to such typical systems there are embodiments of pattern data circuits in which computers are substituted for the memory unit for stitch data words and are capable of computing digital operations such as addition and multiplication, starting from given data, thereby successively generating code words for a determined fancy seam. Moreover, there are at least in theory combinations of systems with memory units and computers in which the memory unit can be used for certain types of fancy seams and the computer for other types.
However, the prior art systems have the disadvantage that the memory unit will be large, when the number of fancy seams is great. Assuming that a hypothetical sewing machine can sew 100 different fancy seams, everyone including 15 stitches on the average, and that the feeding movement demands digital stitch data of 5 bits and the zig-zag movement demands 4 bits, every stitch word in the prior art system thus takes 5+4=9 bits. If every stitch word of each seam is stored separately, the hypothetical sewing machine needs a memory comprising 100.times.15.times.9=13500 bits. Thereto a small amount of code for control of the addressing in the memory etc. is added. A memory with so many bits is large and expensive. It is therefore important to find solutions for reducing the number of bits without decreasing the capability of the machine.
A way to save memory spacing is offered by dividing the fancy seams into seam elements so that every fancy seam will consist of one or more seam elements. One and the same seam element is a part of several fancy seams whereby the memory spacing is minimized. Assuming for instance that two different seam elements A and B have an appearance according to the attached FIG. 1, i.a. the two zig-zag seams according to FIG. 2 can be composed by combination of the seam elements A and B.
A sewing machine having a seam element system for storing data needs two different memories: one memory for describing the appearance of every seam element stitch by stitch, herein called the stitch memory, and one memory describing for every fancy seam the sequence of seam elements forming the selected fancy seam. This memory is called a seam instruction list. The following exemplifying compilation will present an idea of what can be saved by the use of the seam element principle. The inventive idea is stated in claim 1.
A sewing machine with the 100 different fancy seams should, according to the seam element system, be able to sew these seams by means of e.g. 50 different seam elements, each one consisting of 5 stitches on the average. For identification of the seam elements 6 bits (2.sup.6 >50) are required. Every fancy seam comprises 15:5=3 seam elements on the average.
The seam instruction list then needs 100.times.3.times.6=1800 bits and th
REFERENCES:
patent: 4122786 (1978-10-01), Tanimoto et al.
patent: 4200048 (1980-04-01), Makabe et al.
patent: 4275674 (1981-06-01), Carbonato et al.
patent: 4334486 (1982-06-01), Toshiaki et al.
Husqvarna
Miller Alfred E.
Nerbun Peter P.
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