US3847099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ribbon feeding attachment for sewing machines
Assignee: Pfaff Industriemaschinen GmbH
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Filing: 1973-07-31
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Granted: 1974-11-12
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Expires: 1993-07-31
Abstract
Abstract A device attached to a sewing machine for a tension-free feeding of ribbons to be sewn on a fabric, comprises a delivery roller driven at least at the maximum speed of the fabric advance, around which the ribbon drawn off a magazine roll is loosely wrapped in at least one loop before being fed under the pressure foot of the sewing machine. A comb-shaped ribbon retarder defines a meander ribbon feed path and it is mounted between the magazine roll and the delivery roller to hold the ribbon prestressed. At low speeds of the fabric, the draw-off force is small, the ribbon loop is kept loose and the delivery roller is permitted to slip on the ribbon, while at higher speeds of the fabric, the loop is tightened and the increased friction enables the delivery roller to drive the ribbon more effectively so that at any fabric speed, the draw-off and the friction forces are balanced and the ribbon is uniformly and easily fed. The necessary draw-off force to be applied may be reduced by increasing the member of ribbon loops on the delivery roller in which case, in order to prevent superposing of the loops, spacers are provided which are disposed on a rod extending parallel and close to the roller surface.
Inventors
- 👤 O Braun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:36
CPC Classifications
D; D05; D05B; D05B35/00; D05B35/06; D05B29/00; D05B29/06; D05D; D05D2305/00; D05D2305/14
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
129 words
An attachment for feeding ribbon-like strips to be treated under a small tensile stress to the stitch forming location below a foot of a sewing machine, comprising a ribbon supply reel, a delivery roller adjacent said ribbon supply reel, a separate drive motor connected to said delivery roller for rotating said delivery roller at a permanently constant circumferential speed corresponding at least to the maximum possible advance speed of the strip in the machine, means for guiding the ribbon from the ribbon supply reel loosely around said delivery roller in at least one complete and loose loop of at least 360* and following the sense of rotation of the delivery roller and to the sewing machine foot, said delivery roller being driven continuously at least during each sewing operation.
Claim 2
Dependent Claim
129 words
An attachment for feeding ribbon-like strips to be treated under a small tensile stress to the stitch forming location below a foot of a sewing machine, comprising a ribbon supply reel, a delivery roller adjacent said ribbon supply reel, a separate drive motor connected to said delivery roller for rotating said delivery roller at a permanently constant circumferential speed corresponding at least to the maximum possible advance speed of the strip in the machine, means for guiding the ribbon from the ribbon supply reel loosely around said delivery roller in at least one complete and loose loop of at least 360* and following the sense of rotation of the delivery roller and to the sewing machine foot, said delivery roller being driven continuously at least during each sewing operation.
Claim 3
Dependent Claim
30 words
An attachment according to claim 1, including a guide fixture located close to the circumferential surface of the delivery roller defining a meander path through which the ribbon is directed.
Claim 4
Dependent Claim
40 words
An attachment according to claim 2, wherein said guide fixture comprises a guide rod extending along and close to the circumferential surface of the delivery roller, on which spaced apart guide fingers are disposed around which the ribbon is guided.
Claim 5
Dependent Claim
35 words
An attachment according to claim 2, wherein the circumferential surface of said delivery roller is provided with a surface friction coating, so as to increase the friction coefficient between the strip and the delivery roller.
Claim 6
Dependent Claim
20 words
An attachment according to claim 1, wherein in order to increase the angle of wrap, two delivery rollers are provided.
Claim 7
Dependent Claim
58 words
An attachment according to claim 1, including a comb-like guide disposed between said ribbon supply reel and said delivery roller having spaced parallel fingers over which the ribbon is alternately looped over and under so as to follow a meander path thereover, and a guide member disposed between said delivery roller and the foot of the sewing machine.
Claim 8
Independent Claim
83 words
A method of feeding ribbon to the foot of a sewing machine for sewing to a material comprising directing at least one complete loop of 360* of the ribbon from a supply reel over a rotatable delivery roller on its way to the foot and rotating the roller continuously at a constant circumferential speed corresponding at least to the maximum possible advance speed of the ribbon in the foOt during sewing while retarding the ribbon between the supply reel and the delivery roller.
Claim 9
Independent Claim
83 words
A method of feeding ribbon to the foot of a sewing machine for sewing to a material comprising directing at least one complete loop of 360* of the ribbon from a supply reel over a rotatable delivery roller on its way to the foot and rotating the roller continuously at a constant circumferential speed corresponding at least to the maximum possible advance speed of the ribbon in the foOt during sewing while retarding the ribbon between the supply reel and the delivery roller.
Claim 10
Dependent Claim
22 words
A method, according to claim 7, wherein the ribbon is retarded by directing it through a meander path before the delivery roller.
Claim 11
Dependent Claim
67 words
An attachment according to claim 1, including a fixed bar guide located alongside and substantially parallel to said delivery roller, said at least one loop of said ribbon comprising a plurality of loops engaged around said delivery roller and said guide bar, and a plurality of spacer pieces overlying said bar located between adjacent loops of said ribbon and maintaining the spacing between the loops during operation.
References Cited (Backward Citations)
US2266538A
Cited
US2377204A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |