Sewing – Special machines – Darning
Patent
1988-05-31
1990-03-20
Nerbun, Peter
Sewing
Special machines
Darning
11212127, 112130, 112152, 112235, D05B 3506
Patent
active
049091654
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a sewing machine for sewing a rubber strip to a garment.
German DE-OS No. 34 10 181 discloses a sewing machine in which a cutting system is used to cut a rubber strip arranged between a braking device and an insertion opening of the presser foot. This known sewing machine also has an additional braking device between the cutting system and the presser foot, and has a drive system thereof. The additional braking device is not actuated during insertion of the rubber strip, and is actuated immediately before actuation of the cutting system to hold the cut rear end of the rubber band under tension. After sewing the cut rear end of the rubber strip to the garment, it is necessary to insert the forward end of the rubber strip in the insertion opening of the presser foot. The forward end of the rubber strip is moved with the garment to the transporter. The condition that after forming each endless elastic band of the rubber strip, inserting the forward end into the insertion opening of the presser foot must be renewed, presents a very high work delay.
The object of the present invention is to improve the above-mentioned sewing machine, such that after cutting the rear end of each sewn rubber strip, the renewed insertion of the rubber band into the insertion opening of the presser foot is eliminated.
By the present invention, it is attained that after cutting the rear end of each sewn rubber strip, the forward end portion of the rubber strip coming from stock remains in the presser foot and therefore it is unnecessary to renew the insertion thereof.
One embodiment of the present invention is shown in the drawings and will be described later. In the drawings:
FIG. 1 is a schematic illustration of essential parts of a sewing machine, according to the present invention; and
FIGS. 2a and 2b are schematic illustrations of a cutting device to cut a rubber strip.
FIG. 1 shows a schematically shown side view of a sewing machine which is especially suited to sew a rubber strip to a tubular end piece of a garment made from an elastic textile material to produce an endless elastic band. As an under-support for sewing material, a base plate 10 is rigidly secured with the frame of the sewing machine. In an opening of the base plate 10, a transporter 12 to feed the sewing material is movably supported as known. The base plate 10 has also an opening 14 to receive a sewing needle 16. The electric drive for the transporter 12 and the sewing needle is known, and is not shown in the drawing for sake of clarity. A presser foot 18 is in the frame of the sewing machine upward and downward movably supported perpendicular to the base plate 10. A pneumatic cylinder 20 drives the presser foot 18, and is secured with the frame of the sewing machine and the piston rod thereof is connected with the presser foot 18. A forward portion of the pressure foot 18 has an insertion opening 22 for an elastic strip, that is, a rubber strip, 24 for an elastic strip which is supplied from a stock (not shown). In the presser foot 18, a cutting system 26 to cut the rubber strip is mounted, and the construction thereof will be described later.
As shown especially in FIGS. 2a and 2b, the cutting system 26 comprises a cylinder 30 which is rotatably supported in a case 32. The case 32 is non-rotatably secured in the presser foot 18, and has diametrically opposed slits 34 and 36 which align with an inlet opening 22 and with an outlet opening of the presser foot 18 respectively. When the presser foot 18 has no outlet opening, the slit 36 of the case 32 acts as the outlet opening. The cylinder 30 has a through passage 38, and the wall of inlet side is funnellike tapered. Clearly, the outlet side of the passage 38 aligns only at a predetermined angle position of the cylinder with the outlet slit 36 of the case 32, whereas the inlet side of the passage aligns with the inlet slit 34 of the case 32 over a large angle range of the cylinder 30 by the conical widening. In the presser foot 18, a cutting knife 40 is mounted, and the cutting
REFERENCES:
patent: 3094089 (1963-06-01), Shuman
patent: 3149589 (1964-09-01), Fowler, Sr.
patent: 3468269 (1969-09-01), Des Ormeaux et al.
patent: 3847099 (1974-11-01), Braun
patent: 3972296 (1976-08-01), Marforio
Juki Corporation
Nerbun Peter
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