Sewing – Stitch forming – Feeding work material
Patent
1989-10-13
1991-03-12
Schroeder, Werner H.
Sewing
Stitch forming
Feeding work material
11212126, 112152, 112313, 112318, 11212127, 112307, D05B 2710, D05B 3506
Patent
active
049989650
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION.
This invention relates to a feeding device for a sewing machine and more particularly concerns a feeding device which is adapted for feeding to a sewing machine elastic strip material to be sewn into a garment.
DESCRIPTION OF PRIOR ART.
The elastic strip material may be of the type described in our U.K Patent No. 1406821; examples of suitable strip material are available under the registered Trade Marks "BONADEX", "TRICOFLEX" and "PLEATEX".
It is known to feed elastic strip material to a sewing machine through guide means to fold a portion of a garment fabric around the strip ready for sewing. It is also known to feed the strip to a sewing machine under tension so that after sewing into the garment it relaxes to produce an elasticated portion of the garment, e.g. a waistband.
Sometimes intermittent elastication is desired in a portion of a garment and this can be achieved by sewing in discrete lengths of elastic strip material or by using an intermittent tensioning technique such as that described in our copending application No. 8605501.
It is also known to control the tension in an elastic strip of material being fed to a sewing machine in response to the speed of rotation of a portion of the sewing machine.
SUMMARY OF THE INVENTION.
It is an object of the present invention to provide an improved feeding device for feeding elastic strip material to a sewing machine.
According to the present invention a feeding device for feeding elastic strip material to a sewing machine comprises strip feeding means arranged to feed strip in response to one or more control signals, sensing means arranged to sense the rate of feed of the strip and to generate one or more sensing signals and control means arranged to receive said sensing signals and to generate control signals for controlling the strip feeding means.
The strip feeding means preferably comprises a roller having an associated pressure roller to provide a feed nip with the feeding roller. The feeding roller may be driven by a motor which, advantageously, is a stepper motor.
The sensing means may also comprise a roller arranged to be rotated by the strip as it is fed to the sewing machine. The roller may be connected to a signal generator which is conveniently a rotary pulse generator.
Alternatively the sensing means may comprise detecting means arranged to detect features of the strip, or means associated with the strip, to produce sensing signals dependent upon the rate of feed or extension of the strip. Such detecting means may, for example, be arranged to detect marks on the strip which are spaced a predetermined distance apart when the strip is in a relaxed condition.
The control means is arranged to provide the desired control signals in response to sensing signals to adjust the feed rate to a required rate.
The control means is preferably an electronic signal processing device having a display panel and may also be provided with adjusting means, conveniently manually operable adjusting means.
Conveniently the control means can be preset to provide a plurality of preset feed rates and switch means are provided to switch from one preset feed rate to another. Such an arrangement enables an operator to switch from one extension to a different extension in the strip fed to the sewing machine, e.g. intermittent elastication. The switch means may be controlled automatically according to a pre-programmed pattern, or by automatic sensing, such as a position sensing device or stitch count. Alternatively it may be operator-controlled e.g. by means of a knee-switch, foot-switch or hand switch.
BRIEF DESCRIPTION OF THE DRAWINGS.
Reference is now made to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a device according to the invention shown associated with a representation of a sewing machine in dashed lines; and
FIG. 2 is a schematic diagram of a pre-tensioning device for use with the device of FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENTS.
Referring to FIG. 1 a conventional sewing machine is shown in
REFERENCES:
patent: 3721203 (1973-03-01), George
patent: 3856224 (1974-12-01), Van der Aa
patent: 4030429 (1977-06-01), Boser
patent: 4303027 (1981-12-01), Uemura
patent: 4377122 (1983-03-01), Boser
patent: 4389951 (1983-06-01), von Hagen
patent: 4590874 (1986-05-01), Baclagis
patent: 4635575 (1987-01-01), Schips
patent: 4703706 (1987-11-01), Plante
Izaguirre Ismael
Schroeder Werner H.
LandOfFree
Feeding device having control means, feed rollers, a pulse gener does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Feeding device having control means, feed rollers, a pulse gener, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Feeding device having control means, feed rollers, a pulse gener will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-446111