US3911840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Guide and sewing device for fabric layers along a shaped edge
Assignee: Virginio Rimoldi and Co SpA
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Filing: 1974-05-09
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Granted: 1975-10-14
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Expires: 1994-05-09
Abstract
Abstract An improved apparatus for guiding layers of fabric to be sewn along an edge of irregular configuration having clamping members for moving the work along a support plane to a sewing machine. The apparatus includes sensing elements for detecting irregularities in the edge to be sewn and devices operatively associated with the sensing elements for orienting the work as it is advanced to the sewing machine, reducing the speed of the sewing machine while sewing in the area of a variation in the fabric edge and returning the sewing machine to normal operating speed upon completion of the sewing in the area of the variation.
Inventors
- 👤 Nerino Marforio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:36
CPC Classifications
D; D05; D05B; D05B35/00; D05B35/10; D05B35/105; D05B29/00; D05B29/06; D05D; D05D2203/00; D05D2207/00; D05D2207/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
207 words
An apparatus for guiding and sewing layers of fabric along an edge of irregular configuration comprising: a. a support plane; b. a sewing machine fixed to one end of said support plane having a drive motor of the electromagnetic friction brakeclutch type; c. a support arm extending from said support plane having rotatable guide means carried thereby in a plane parallel with and spaced from said support plane; d. means movable along said rotatable guide means for clamping the fabric and advancing the same toward said sewing machine along said support plane; e. sensing means carried by said support plane for detecting variations in the edge of the layer of fabric to be sewn which includes: 1. means operatively connected to said sensing means for rotating said rotatable guide means and clamping means carried thereby so as to orient the position of the fabric as it is advanced to said sewing machine; 2. means for reducing the speed of said sewing machine when the fabric is shifted to accommodate an acute variation in the edge of the fabric; and 3. means for returning said sewing machine to its initial operating speed upon completion of the sewing in the area of the acute variation in the fabric edge.
Claim 2
Independent Claim
207 words
An apparatus for guiding and sewing layers of fabric along an edge of irregular configuration comprising: a. a support plane; b. a sewing machine fixed to one end of said support plane having a drive motor of the electromagnetic friction brakeclutch type; c. a support arm extending from said support plane having rotatable guide means carried thereby in a plane parallel with and spaced from said support plane; d. means movable along said rotatable guide means for clamping the fabric and advancing the same toward said sewing machine along said support plane; e. sensing means carried by said support plane for detecting variations in the edge of the layer of fabric to be sewn which includes: 1. means operatively connected to said sensing means for rotating said rotatable guide means and clamping means carried thereby so as to orient the position of the fabric as it is advanced to said sewing machine; 2. means for reducing the speed of said sewing machine when the fabric is shifted to accommodate an acute variation in the edge of the fabric; and 3. means for returning said sewing machine to its initial operating speed upon completion of the sewing in the area of the acute variation in the fabric edge.
Claim 3
Dependent Claim
26 words
means for reducing the speed of said sewing machine when the fabric is shifted to accommodate an acute variation in the edge of the fabric; and
Claim 4
Dependent Claim
26 words
means for reducing the speed of said sewing machine when the fabric is shifted to accommodate an acute variation in the edge of the fabric; and
Claim 5
Dependent Claim
49 words
The apparatus for guiding and sewing layers of fabric according to claim 1 wherein said sensing means includes first and second pairs of photoelectric cells located adjacent to said sewing machine and disposed in a plane extending transversely to the direction of advance of the fabric to be sewn.
Claim 6
Dependent Claim
27 words
means for returning said sewing machine to its initial operating speed upon completion of the sewing in the area of the acute variation in the fabric edge.
Claim 7
Dependent Claim
27 words
means for returning said sewing machine to its initial operating speed upon completion of the sewing in the area of the acute variation in the fabric edge.
Claim 8
Dependent Claim
45 words
The apparatus for guiding and sewing layers of fabric according to claim 2 wheRein said means for rotating said rotatable guide means and clamping means includes a pneumatic cylinder having a solenoid controlled valve in circuit with said first and second pairs of photoelectric cells.
Claim 9
Dependent Claim
56 words
The apparatus for guiding and sewing layers of fabric according to claim 2 wherein said means for reducing the speed of said sewing machine includes an electrical control in circuit with said second pair of photoelectric cells for effecting energizing and deenergizing with pre-established frequency the electromagnetic components of the clutch portion of said drive motor.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |