US3559601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Skip stitch mechanism for household sewing machines
Assignee: Singer Co
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Filing: 1969-08-07
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Granted: 1971-02-02
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Expires: 1989-08-07
Abstract
Abstract A needle bar reciprocation interrupting mechanism is disclosed for sewing machines by which the formation of stitches may be intentionally skipped so that extremely long stitches as for basting may be formed, or by which isolated stitch groups may be sewn. In the mechanism disclosed the stitches will be skipped each time the zigzag mechanism jogs the needle bar beyond a range of positions in which it can cooperate with the stitch-forming mechanism to form a stitch. In this manner the complete range of zigzag stitch capabilities of the sewing machine will remain available and the skip stitch mechanism does not require any more than setting of the conventional zigzag control means to render it selectively effective. Also disclosed is a safety cam means by which the needle bar when jogged to an abnormal position will automatically be deflected back into the range of positions capable of forming a stitch in the event that the needle bar interrupting means should accidentally malfunction.
Inventors
- 👤 Edward J Tullman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:33
CPC Classifications
D; D05; D05B; D05B81/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
145 words
A skip stitch mechanism in a sewing machine having a frame, actuating mechanism carried in said frame, a needle bar carried by said frame for endwise reciprocation and for lateral jogging movement for the formation of zigzag stitches, means on said sewing machine establishing a predetermined range of laterally jogged positions of said needle bar in which it is possible for stitches to be formed, means driven by said actuating mechanism for imparting endwise reciprocation to said needle bar, mechanism driven by said actuating mechanism for imparting lateral jogging movement to said needle carrying bar within said predetermined range of laterally jogged positions, means for influencing the lateral jogging movement of said needle bar beyond said predetermined range of laterally jogged positions, and interrupting means for said needle bar reciprocating means effective only during lateral jogging movement of said needle bar beyond said predetermined range.
Claim 2
Dependent Claim
145 words
A skip stitch mechanism in a sewing machine having a frame, actuating mechanism carried in said frame, a needle bar carried by said frame for endwise reciprocation and for lateral jogging movement for the formation of zigzag stitches, means on said sewing machine establishing a predetermined range of laterally jogged positions of said needle bar in which it is possible for stitches to be formed, means driven by said actuating mechanism for imparting endwise reciprocation to said needle bar, mechanism driven by said actuating mechanism for imparting lateral jogging movement to said needle carrying bar within said predetermined range of laterally jogged positions, means for influencing the lateral jogging movement of said needle bar beyond said predetermined range of laterally jogged positions, and interrupting means for said needle bar reciprocating means effective only during lateral jogging movement of said needle bar beyond said predetermined range.
Claim 3
Dependent Claim
99 words
A skip stitch mechanism as set forth in claim 1 in which said mechanism for imparting lateral jogging movement to said needle bar within said predetermined range in which it is possible for stitches to be formed is adapted to be influenced by a selectable response producing record, and in which said means for influencing lateral jogging movement of said needle bar beyond said predetermined range includes a different response producing record substitutable in said mechanism for imparting lateral jogging movement to said needle in place of a response producing record for said predetermined range of laterally jogged positions.
Claim 4
Dependent Claim
92 words
A skip stitch mechanism as set forth in claim 2 in which said response producing record for imparting lateral jogging movement to said needle bar within said predetermined range comprises a rotary pattern cam having a peripheral cam track of which the radius varies within predetermined limits, and in which said means for influencing lateral jogging movement of said needle bar beyond said predetermined range includes a rotary pattern cam having a peripheral cam track with portions formed at a radius smaller than said predetermined limits of a pattern cam for stitching.
Claim 5
Dependent Claim
172 words
A skip stitch mechanism as set forth in claim 1 in which said needle bar is driven in only one direction by said mechanism for imparting lateral jogging movement to said needle bar and in which means biases said needle bar in the opposite direction, and in which said interrupting means includes interengaging latch means on said needle carrying bar and on said means For imparting endwise reciprocation to said needle carrying bar, and abutment means carried by said sewing machine frame and located for contact with said latch means to effect unlatching thereof only during lateral jogging movement of said needle bar beyond said predetermined range in said opposite direction, and in which safety cam means is carried by said sewing machine frame and disposed in the path of reciprocation of means on said needle bar when said needle bar is jogged in said opposite direction beyond said predetermined range of laterally jogged positions so as to deflect said needle bar in opposition to the bias and into said predetermined range.
Claim 6
Dependent Claim
45 words
A skip stitch mechanism as set forth in claim 4 in which a keeper element adjoins said safety cam means and cooperates with said latch means on said needle bar for retaining said interrupted needle bar substantially at the top of said needle bar reciprocation.
References Cited (Backward Citations)
US3433190A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |