Sewing – Work manipulating – Guides
Patent
1982-12-20
1984-09-04
Nerbun, Peter P.
Sewing
Work manipulating
Guides
112158E, D05B 306
Patent
active
044690355
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an arrangement in an electronic sewing machine with a memory and data circuits for performing fancy seams, such as button holes.
When sewing two seams, e.g. rows of zigzag stitches of a button hole made by forward feeding in a first row and reverse feeding in a second row, it will be found that equal length of the feeding movement in each seam does not provide equally tight seams (rows), since the cloth feeder does not work as effectively in the reverse direction as in the forward direction, and the feeding mechanism does not effect exactly the same length of the feeding movements in the forward direction as in the reverse direction. It is therefore necessary to make a correction when sewing the second seam in order to have the same stitch density of the second seam as that of the first seam. Every kind of cloth demands a special correction, and this must therefore be adjusted by the operator.
The present invention provides a memory arrangement in an electronic sewing machine by which it is possible to automatically perform seams having equal stitch lengths independent of the feed direction. The arrangement comprises two individually usable memory units which are to be individually adjusted for the different stitch lengths of the respective seams. Electronic sewing machines are already provided with a stitch length memory which keeps the adjustment of a stitch length control from the one fancy seam to the other, and this memory can preferably be used when sewing the first seam.
A sewing machine according to the invention, has the ability to reproduce seams with a stitch length determined in advance for a selected seam and having adjusting means on which the opertor selects such a seam.
An example of such an arrangement in a sewing machine according to the invention will be described in the following with references to the attached drawing which shows in
FIG. 1 a panel with a seam selection device of a sewing machine,
FIG. 2 a general diagram of a control unit for performing i.a. a button hole seam, and
FIG. 3 a general diagram of a variation of such a control unit.
On a sewing machine provided with a post 10 is mounted a control panel 11 with indicating means 12, buttons 13 and a rotary control 14. These members are used for informing the electronic control unit of the machine (FIGS. 2 and 3) of a certain seam selection. The rotary control is used for making an adjustment on a certain fancy seam, such as a button hole which may be shown by symbols at several positions around the rotary control. After the adjustment of this control the zigzag width and the stitch length can be adjusted individually on a couple of switches 15,16. The indicating means above these switches show the adjusted width and length respectively.
Output wires are provided from the contacts of every adjusted position on the rotary control, e.g. a wore 17 for the first row of zigzag stitches of the button hole, a wire 18 for the second row, and a group 19 for the other seams (FIGS. 2 and 3). The diagram of these figures are only related to the control of the stitch length for the sewing of the seams. However, a similar diagram may be used for the control of the zigzag width, but in the illustrated embodiment the problem of concern is the balance between forward and reverse feeding, so the zigzag control is not specifically discussed here.
An embodiment of a control unit is shown in FIG. 2 where two binary counters 20,21 are used as two individual memories, one for each one of the rows of zigzag stitches of a button hole. The stitch length changing switch 15 is so connected that during the sewing of the first row only the counter 20 is adjusted and during the sewing of the second row only the counter 21 is adjusted. Counter 21 contains then a stitch length difference which can be positive, negative or zero. The code of the total stitch length of the second row is put together in an adding unit 22.
An embodiment supplying these functions is shown in FIG. 2. The switch 15 has three positions, i.e. a neutral
REFERENCES:
patent: 4185571 (1980-01-01), Minalga
patent: 4250821 (1981-02-01), Miyao et al.
patent: 4343249 (1982-08-01), Takenoya et al.
Husqvarna Aktiebolag
Nerbun Peter P.
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