US3828704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined upper and lower feed for sewing machines
Assignee: Union Special GmbH
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Filing: 1973-02-15
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Granted: 1974-08-13
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Expires: 1993-02-15
Abstract
Abstract This disclosure relates to a feed mechanism for sewing machines wherein the upper feed assembly includes a pressure foot and a separate upper fabric slide which operates in conjunction with a lower fabric slide. The pressure foot is constantly resiliently urged towards the needle plate and the mounting means for the upper fabric side includes a spring and means for compressing the spring and tightly applying the upper fabric slide against fabric during the feeding movement thereof with the force required to compress the spring reacting against the means resiliently retaining the pressure foot in place so as to reduce the pressure exerted by the pressure foot during the feeding of fabric relative thereto while at the same time permitting the restoring of the pressure on the pressure foot during the retracting movement of the fabric slides. The lower fabric slide may also have incorporated therein a spring resiliently urging the same towards the pressure foot with the combined reactive forces of the fabric slides springs being less than that applied on the pressure foot.
Inventors
- 👤 Hagen W Von
- 👤 H Gauch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:37
CPC Classifications
D; D05; D05B; D05B27/00; D05B27/02; D05B27/04
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
138 words
A fabric feeding device for a sewing machine comprising a needle plate, a pressure foot, first means mounting said pressure foot for cooperation with said needle plate including a pressure foot spring constantly urging said pressure foot towards said needle plate, a lower fabric slide disposed in cooperating relation with said pressure foot, second means mounting said lower fabric slide for reciprocating movement generally parallel to said needle plate, third means connected to said pressure foot for reducing the effective pressure of said pressure foot spring on said pressure foot during the fabric feeding movement of said lower fabric slide and said lower fabric slide projects through said needle plate only to the extent that fabric being sewn is effectively gripped thereby, and means limiting such projection to one wherein lifting movement of said pressure foot is avoided.
Claim 2
Dependent Claim
138 words
A fabric feeding device for a sewing machine comprising a needle plate, a pressure foot, first means mounting said pressure foot for cooperation with said needle plate including a pressure foot spring constantly urging said pressure foot towards said needle plate, a lower fabric slide disposed in cooperating relation with said pressure foot, second means mounting said lower fabric slide for reciprocating movement generally parallel to said needle plate, third means connected to said pressure foot for reducing the effective pressure of said pressure foot spring on said pressure foot during the fabric feeding movement of said lower fabric slide and said lower fabric slide projects through said needle plate only to the extent that fabric being sewn is effectively gripped thereby, and means limiting such projection to one wherein lifting movement of said pressure foot is avoided.
Claim 3
Dependent Claim
138 words
A fabric feeding device for a Sewing machine comprising a needle plate, a pressure foot, first means mounting said pressure foot for cooperation with said needle plate including a pressure foot spring constantly urging said pressure foot towards said needle plate, a lower fabric slide disposed in cooperating relation with said pressure foot, second means mounting said lower fabric slide for reciprocating movement generally parallel to said needle plate, third means connected to said pressure foot for reducing the effective pressure of said pressure foot spring on said pressure foot during the fabric feeding movement of said lower fabric slide said second means includes a lower fabric slide spring resiliently urging said lower fabric slide towards said pressure foot, and the effective force of said lower fabric slide spring is less than that of said pressure foot spring.
Claim 4
Dependent Claim
138 words
A fabric feeding device for a Sewing machine comprising a needle plate, a pressure foot, first means mounting said pressure foot for cooperation with said needle plate including a pressure foot spring constantly urging said pressure foot towards said needle plate, a lower fabric slide disposed in cooperating relation with said pressure foot, second means mounting said lower fabric slide for reciprocating movement generally parallel to said needle plate, third means connected to said pressure foot for reducing the effective pressure of said pressure foot spring on said pressure foot during the fabric feeding movement of said lower fabric slide said second means includes a lower fabric slide spring resiliently urging said lower fabric slide towards said pressure foot, and the effective force of said lower fabric slide spring is less than that of said pressure foot spring.
Claim 5
Dependent Claim
137 words
A fabric feeding device for a sewing machine comprising a needle plate, a pressure foot, first means mounting said pressure foot for cooperation with said needle plate including a pressure foot spring constantly urging said pressure foot towards said needle plate, a lower fabric slide disposed in cooperating relation with said pressure foot, second means mounting said lower fabric slide for reciprocating movement generally parallel to said needle plate, third means connected to said pressure foot for reducing the effective pressure of said pressure foot spring on said pressure foot during the fabric feeding movement of said lower fabric slide, said second means mount said lower fabric slide for reciprocating movement only, and said lower fabric slide has fabric engaging teeth with upper edges lying substantially in the plane of the upper surface of said needle plate.
Claim 6
Dependent Claim
137 words
A fabric feeding device for a sewing machine comprising a needle plate, a pressure foot, first means mounting said pressure foot for cooperation with said needle plate including a pressure foot spring constantly urging said pressure foot towards said needle plate, a lower fabric slide disposed in cooperating relation with said pressure foot, second means mounting said lower fabric slide for reciprocating movement generally parallel to said needle plate, third means connected to said pressure foot for reducing the effective pressure of said pressure foot spring on said pressure foot during the fabric feeding movement of said lower fabric slide, said second means mount said lower fabric slide for reciprocating movement only, and said lower fabric slide has fabric engaging teeth with upper edges lying substantially in the plane of the upper surface of said needle plate.
Claim 7
Dependent Claim
126 words
A fabric feeding device for a sewing machine comprising a needle plate, a pressure foot, first means mounting said pressure foot for cooperation with said needle plate including a pressure foot spring constantly urging said pressure foot towards said needle plate, a lower fabric slide disposed in cooperating relation with said pressure foot, second means mounting said lower fabric slide for reciprocating movement generally parallel to said needle plate, third means connected to said pressure foot for reducing the effective pressure of said pressure foot spring on said pressure foot during the fabric feeding movement of said lower fabric slide, an upper fabric slide, and fourth means mounting said upper fabric slide for cooperation with said lower fabric slide and for reciprocating movement in unison therewith.
Claim 8
Dependent Claim
126 words
A fabric feeding device for a sewing machine comprising a needle plate, a pressure foot, first means mounting said pressure foot for cooperation with said needle plate including a pressure foot spring constantly urging said pressure foot towards said needle plate, a lower fabric slide disposed in cooperating relation with said pressure foot, second means mounting said lower fabric slide for reciprocating movement generally parallel to said needle plate, third means connected to said pressure foot for reducing the effective pressure of said pressure foot spring on said pressure foot during the fabric feeding movement of said lower fabric slide, an upper fabric slide, and fourth means mounting said upper fabric slide for cooperation with said lower fabric slide and for reciprocating movement in unison therewith.
Claim 9
Dependent Claim
76 words
The device of claim 4 wherein said fourth means includes an upper fabric slide spring urging said upper fabric slide towards said needle plate, and said third means includes means for actuating said fourth means to move said upper fabric slide towards said needle plate compressing said upper fabric slide spring and transferring the force thereof to oppose the force of said pressure foot spring and thus relieve the effective pressure of said pressure foot spring.
Claim 10
Dependent Claim
70 words
The device of claim 4 wherein said first and fourth means include first and second support rods for said pressure foot and said upper fabric slide respectively, and said third means includes a ternary member separately pivotally connected to said first and second support ends, and actuating means connected to said ternary member to effect pivoting thereof in timed relation to the reciprocation of said upper and lower fabric slides.
Claim 11
Dependent Claim
24 words
The device of claim 6 wherein the connection between said ternary member and said first support rod defines a pivot for said ternary member.
Claim 12
Dependent Claim
69 words
The device of claim 6 wherein said fourth means includes an upper fabric slide spring extending between said upper fabric slide and said second support rod and said ternary member being operable when pivoted to depress said second support rod against the force of said upper fabric slide spring and transfer the reaction therefrom to said pressure foot spring to reduce the force exerted thereby on said pressure foot.
Claim 13
Dependent Claim
24 words
The device of claim 8 wherein the connection between said ternary member and said first support rod defines a pivot for said ternary member.
Claim 14
Dependent Claim
51 words
The device of claim 8 wherein said second means includes a lower fabric slide spring resiliently urging said lower fabric slide towards said pressure foot, and the combined effective force on said pressure foot of said upper and lower fabric slide springs is less than that of said pressure foot spring.
Claim 15
Dependent Claim
49 words
The device of claim 4 wherein said second mounting means include spring means for biasing said lower fabric slide in a direction towards that upper fabric slide, and said fourth mounting means includes spring means for biasing said upper fabric slide in a direction towards said lower fabric slide.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |