US 5,076,184 AGranted

Method of controlling a sewing machine and a sewing machine utilizing this method

AssigneeMefina S.A.

InventorsGerard Tschopp, Claude Buchilly, Christian R. Kohli

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Abstract

A method for controlling a computerized sewing machine which enables designs or patterns of modified length with respect to the standard value of each original design or pattern available to be sewn while retaining the density of stitches and the general shape of the original design. Algorithms are utilized indicating, for each block of stitches included in the original design or pattern, the number of times that this block is to be sewn to obtain the design of modified length. The microprocessor sewing machine using the method of the invention includes means requiring the microprocessor to read ongoing instructions repeatedly for at least certain blocks among the block of stitches for the basic design or pattern.

Claims5

Dependent claims

A computerized sewing machine, comprising:

first means for controlling alternating axial movement of a needle to penetrate into material to be sewn, and a loop pick-up for cooperating with the needle to form a sewing stitch,
second means for controlling relative displacements of the needle and the material to be sewn in two orthogonal directions with a specific amplitude in each direction,
at least one electronic memory for storing sewing instructions corresponding to various patterns to be sewn, said instructions being readable sequentially and selectively to effect control of said second means,
first selection units for said patterns,
a microprocessor for co-operating with said memory to read from it sewing instructions for any selected pattern and to control the second control means in accordance with read instructions, p1 third means for controlling the operation of the microprocessor, based on instructions stored in the memory, to control execution of patterns of a length different from that corresponding to said instructions, and
second units for selection of the variation in length to be implemented for any preselected pattern, wherein said third means embodies, stored in the memory, a first sequence of computerized instructions for sewing at least certain blocks of stitches defining the selected pattern as stored so as to obtain a corresponding repetition of the sewing of these blocks to form the pattern of modified length as a function of the variation selected by actuation of said second units, and at least a second sequence of computerized instructions setting the number of times that each block belonging to the stored pattern should be sewn, in the modified pattern, as well as the positioning of the blocks within the modified pattern, the procedure being effected so that the elongated pattern sewn on the material has the modified length required while retaining a general shape resembling that of the pattern stored in the memory and from which it is derived.

3 more elements

A method for controlling a sewing machine having an axially movable needle, a device for driving the needle in an alternating axial movement, a mechanism for controlling a relative displacement, in translation, of the needle and of a material to be sewn, a loop pick-up, first means for driving said loop pick-up an second means for controlling, in synchrony, said device for driving, said mechanism for controlling, and said first means for driving so as to sew designs or patterns onto the material, each said design or pattern, comprising a plurality of blocks of stitches, at least a portion of an outline of each of said blocks of stitches embodying at least a series of two adjacent stitches resulting from a relative displacement of the cloth and the needle, of different amplitude or different orientation from stitch to stitch, the machine further including a control unit whereby an original length of a basic pattern can be respectively increased and decreased while keeping the density of the stitches sewn constant wherein, in order to increase the original length of a basic pattern, the method comprising repeating at least once the sewing of at least certain blocks of stitches of the basic pattern, immediately after the block to be repeated and wherein, to reduce the length of said basic pattern, the method comprises suppressing the sewing of at least certain of the blocks of the basic pattern, a total number of blocks of the pattern thus modified being equal to the number of blocks of the basic pattern multiplied by the ratio of the length desired for the modified pattern to the length of the basic pattern.

Dependencies are inferred from the claim text.

Facts

Application: 07/550,833Filed 11 Jul 1990
Priority: CH 2582/8911 Jul 1989
Granted: 31 Dec 1991
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

D05B 19/10
Characterised by memory aspects: arrangements for selecting combinations of stitch or pattern data from memory ; Handling data in order to control…
G05B 19/408
Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to…
G05B 2219/36097
Nc in input of data, input key till input tape: override program to scale workpiece
G05B 2219/36098
Nc in input of data, input key till input tape: overide program to execute a certain number of same blocks, repeat pattern