Patent US3623441A successfully refreshed from Google Patents.
US3623441A
Expired / Lapsed
US
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Presser mechanism for sewing machines
Assignee: Union Special Machine Co
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Filing: 1969-11-21
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Granted: 1971-11-30
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Expires: 1989-11-21
Abstract
Abstract This disclosure relates to a low-inertia adjustable stroke presser foot for sewing machines which is operable to feed the uppermost ply of superimposed plies being sewn to compensate for the drag exerted by the presser foot sole upon the upper ply. The presser foot is automatically driven through its cooperation with the feed dog and effects the feeding of the upper ply at the termination of the work feeding action of the feed dog. The presser mechanism is adjustable to vary the work feeding movement of the presser foot in accordance with the requirements of the fabric being sewn.
Inventors
- 👤 Edgar Schoij
- 👤 Frederick M Klose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:00
CPC Classifications
D; D05; D05B; D05B29/00
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
107 words
A presser mechanism for sewing machines comprising a presser bar, a presser foot sole, and means mounting said presser foot sole on said presser bar for cooperation with a feed dog, said mounting means including means for imparting to said presser foot sole a work-feeding movement during each work-feeding operation of sufficient magnitude to advance an upper work ply to substantially compensate for any holding back of such upper ply by said presser foot sole during the work-feeding operation, said mounting means including means for adjusting the amount of work advancing movement of said presser foot sole in accordance with he requirements of the work being sewn.
Claim 2
Dependent Claim
107 words
A presser mechanism for sewing machines comprising a presser bar, a presser foot sole, and means mounting said presser foot sole on said presser bar for cooperation with a feed dog, said mounting means including means for imparting to said presser foot sole a work-feeding movement during each work-feeding operation of sufficient magnitude to advance an upper work ply to substantially compensate for any holding back of such upper ply by said presser foot sole during the work-feeding operation, said mounting means including means for adjusting the amount of work advancing movement of said presser foot sole in accordance with he requirements of the work being sewn.
Claim 3
Dependent Claim
40 words
The presser mechanism of claim 1 wherein said means for adjusting the amount of work-advancing movement of said pressure foot sole in accordance with the requirements of the work being sewn are also in part carried by said presser bar.
Claim 4
Dependent Claim
119 words
A presser mechanism for sewing machines comprising a presser bar, a presser foot sole, and means mounting said presser foot sole on said presser bar for cooperation with a feed dog, said mounting means including means for imparting to said presser foot sole a work feeding movement during each work-feeding operation of sufficient magnitude to advance an upper work ply to substantially compensate for any holding back of such upper ply by said presser foot sole during the work-feeding operation, said mounting means being of a construction to effect a faster feeding movement of said presser foot sole than the feeding movement of an associated feed dog during the end portion of the feeding movement of such feed dog.
Claim 5
Dependent Claim
119 words
A presser mechanism for sewing machines comprising a presser bar, a presser foot sole, and means mounting said presser foot sole on said presser bar for cooperation with a feed dog, said mounting means including means for imparting to said presser foot sole a work feeding movement during each work-feeding operation of sufficient magnitude to advance an upper work ply to substantially compensate for any holding back of such upper ply by said presser foot sole during the work-feeding operation, said mounting means being of a construction to effect a faster feeding movement of said presser foot sole than the feeding movement of an associated feed dog during the end portion of the feeding movement of such feed dog.
Claim 6
Dependent Claim
139 words
A presser mechanism for sewing machines comprising a presser bar, a presser foot sole, and means mounting said presser foot sole on said presser bar for cooperation with a feed dog, said mounting means including means for imparting to said presser foot sole a work-feeding movement during each work feeding operation of sufficient magnitude to advance an upper work ply to substantially compensate for any holding back of such upper ply by said presser foot sole during the work-feeding operation, said mounting means including a lever mounted for pivotal movement relative to said presser bar and having a pivotal connection with said presser foot sole, said lever sloping downwardly toward said presser foot sole, in a direction generally opposing the direction of work feed and at an angle including an appreciable component parallel to the plane of work feed.
Claim 7
Dependent Claim
139 words
A presser mechanism for sewing machines comprising a presser bar, a presser foot sole, and means mounting said presser foot sole on said presser bar for cooperation with a feed dog, said mounting means including means for imparting to said presser foot sole a work-feeding movement during each work feeding operation of sufficient magnitude to advance an upper work ply to substantially compensate for any holding back of such upper ply by said presser foot sole during the work-feeding operation, said mounting means including a lever mounted for pivotal movement relative to said presser bar and having a pivotal connection with said presser foot sole, said lever sloping downwardly toward said presser foot sole, in a direction generally opposing the direction of work feed and at an angle including an appreciable component parallel to the plane of work feed.
Claim 8
Dependent Claim
26 words
The presser mechanism of claim 4 wherein the included angle between said lever and the plane of work feed is between 15* and b 75* .
Claim 9
Dependent Claim
26 words
The presser mechanism of claim 4 wherein the included angle between said lever and the plane of work feed is between 30* and 50 * .
Claim 10
Dependent Claim
44 words
The presser mechanism of claim 4 wherein said mounting means also includes a bracket carried by said presser bar, and said lever is mounted on a pin carried by said bracket, and said pin is adjustable relative to said bracket to vary said angle.
Claim 11
Dependent Claim
21 words
The presser mechanism of claim 7 wherein said pin adjustment has a component parallel to the plane of said work feed.
Claim 12
Dependent Claim
35 words
The presser mechanism of claim 7 wherein said pin adjustment has a component parallel to the plane of said work feed, and said presser bar is adjustable along a line generally normal to said plane,
Claim 13
Dependent Claim
24 words
The presser mechanism of claim 7 wherein said pin adjustment has components both normal to and parallel to the plane of said work feed.
Claim 14
Dependent Claim
38 words
The presser mechanism of claim 7 wherein said pin adjustment has components both normal to and parallel to the plane of said work feed, and said presser bar is adjustable along a line generally normal to said plane.
Claim 15
Dependent Claim
55 words
The presser mechanism of claim 4 wherein said mounting means also includes a bracket carried by said presser bar, and said lever is mounted on a pin carried by said bracket, and an adjustable spring member mounted on said pin reacting on said lever to resiliently urge said presser foot sole to an operative position.
Claim 16
Dependent Claim
66 words
The presser mechanism of claim 1 wherein said mounting means also includes a bracket carried by said presser bar, and said lever is mounted on a pin carried by said bracket, said lever being part of a bellcrank, and an adjustable spring mounted on said bracket and coupled to said bellcrank reacting on said lever to resiliently urge said presser foot sole to an operative position.
Claim 17
Dependent Claim
66 words
The presser mechanism of claim 4 wherein said mounting means also includes a bracket carried by said presser bar, and said lever is mounted on a pin carried by said bracket, a second pin carried by said bracket, a spring mounted on said second pin and adjustably connected to said bracket reacting on said lever to resiliently urge said presser foot sole to an operative position.
Claim 18
Dependent Claim
69 words
The presser mechanism of claim 4 wherein sad presser bar is constantly resiliently urged toward a lowermost position wherein said presser foot sole is operative, an adjustable stop cooperating with said presser bar to determine said lowermost position, and said adjustable stop being operative to vary the angle of said lever to the plane of work feed and thereby vary the work feeding movement of said presser foot sole.
Claim 19
Dependent Claim
48 words
The presser mechanism of claim 15 wherein said presser bar is guidedly mounted in an upper guide for axial movement therethrough with the upper end of said presser bar being exposed, and said adjustable stop being mounted on said presser bar upper end for engagement with said guide.
Claim 20
Dependent Claim
115 words
The presser mechanism of claim 4 wherein a feed dog is mounted in cooperation with said presser foot sole, means coupled with said feed dog for moving said feed do along an elevated work feeding path and thereafter along a rapidly changing path toward a retracted work releasing position wherein the component of feed dog movement parallel to the plane of work feed rapidly decreased toward zero, and the angle of said lever to the plane of work feed effecting at the same time an initail movement of said presser foot sole with said feed dog followed by a significant movement of said presser foot sole relative to said feed dog in a work-feeding direction.
Claim 21
Dependent Claim
58 words
The pressure mechanism of claim 17 wherein said mounting means includes means for adjusting the angle of said lever to the plane of work feed to thereby selectively adjust the amount of movement of said presser foot sole relative to said feed dog in a work feeding direction in accordance with the requirements of the work being sewn.
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) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |