Sewing – Work manipulating – Guides
Patent
1981-08-06
1983-08-23
Nerbun, Peter P.
Sewing
Work manipulating
Guides
D05B 302
Patent
active
043997597
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a sewing machine provided with pattern selection means and an electronic memory for the supply of stitch data to needle positioning and feeding mechanisms for sewing 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 for instance be 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 position 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 or the like. The address counter then releases the code words for everyone of the following stitches out of the memory as the fancy seam is sewn. The input selector here said and assumed to be a set of change-over switches can, in the known systems, be carried out as described in U.S. Pat. No. 3,913,506. The selector arrangement thus described has a row of single-pole switches, one of which is actuated for the selection of a pattern. All the switches comprise in an encoder, which generates a unique code for the selected seam. However, the encoder is complicated when using a large number of switches in the selector, a reason why it is desirable to simplify or, if possible, totally eliminate the same in the systems.
The present invention provides an input selector having a code generated in a row of switches, one by one representing one or more patterns. The requirement for an encoder is eliminated and, moreover, the number of wires from the selector is reduced as the information is already there composed of data bits. Thanks to the possibility of using double-pole switches in the selector a better reliability is achieved than by using sliding contacts, capacitive transducers etc. The selector according to the invention is simple but somewhat unconventional in form.
An embodiment of the input selector according to the invention will be described in the following paragraphs with reference to the accompanying drawing, wherein
FIG. 1 shows a panel with pattern selection knobs of an input selector in a sewing machine,
FIG. 2 is a wiring diagram of the input selector,
FIG. 3 is an embodiment of a start address memory (standard circuit TTL "271") to which the input selector is connected, and
FIG. 4 is a diagram of an encoder (standard circuit "74148").
A panel 11 is provided as a carrier for a set of push-buttons 12 and a pair of controls 13, 14 on a sewing machine provided with a post 10. These buttons and controls are used for transferring a determined selection of a seam to the electronics in the machine, e.g. the controls may be used for re-adjustment of a determined series of seam patterns, for instance utility seams of which at least one can be selected the buttons 12. When the operator pushes such a button, a so-called seam selection code is created which is fed to a so-called start address memory (FIG. 3), which is here assumed to be a standard circuit TTL 74S271. The procedure of creating such a code is explained with reference to FIG. 2.
In the illustrated embodiment the number of push-buttons is 6, since this number of double-pole combinations go into a four-wire group 15 (4-bits code). If more combinations are desired, e.g. ten, another wire is needed (5-bit code) etc. A double-pole switch 16 is provided for every push-button and has a common (ground) contact 17, through which the two other contacts 18, 19 connected to two of the wires 15 are grounded. The distribution of the contacts 18, 19 of the several switches 16 to the wires 15 is such that a pushed, arbitrary b
REFERENCES:
patent: 4086862 (1978-05-01), Makabe et al.
patent: 4323022 (1982-04-01), Hanyu et al.
Husqvarna Aktiebolag
Miller Alfred E.
Nerbun Peter P.
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