Patent US3436862A successfully refreshed from Google Patents.
Patent US3815532A successfully refreshed from Google Patents.
US3815532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Needle bar release and raising mechanisms
Assignee: Singer Co
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Filing: 1973-04-04
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Granted: 1974-06-11
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Expires: 1993-04-04
Abstract
Abstract A mechanism for use in a sewing machine having a latch mechanism affixed to a needle bar and connecting the needle bar to an endwise reciprocating driving mechanism. The mechanism is supported by a guide block of a presser mechanism and is effective, when the presser mechanism is super-elevated, to disconnect the needle bar from its endwise reciprocating driving mechanism. In the preferred embodiment, a supporting member affixed to the presser bar guide block pivotably supports a bell crank, one arm of which contains a series of teeth. As the presser bar is being super-elevated a spring bias is applied to the bell crank causing the bell crank to be rotated, placing the teeth in contact with an arm of a latch lever of the latch mechanism affixed to the needle bar. Continued elevation disconnects the needle bar from its driving mechanism and also raises the needle bar a slight amount. Concurrently the presser foot is brought to a super-elevated position.
Inventors
- 👤 W Weisz
- 👤 C Odermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:25
CPC Classifications
D; D05; D05B; D05B55/00; D05B55/14; D05B55/16
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
151 words
In a sewing machine having a frame, a needle bar endwise reciprocable in said frame, needle bar reciprocating mechanism including a drive link carried in said frame, a latch mechanism carried on said needle bar for selectively coupling said drive link to said needle bar, a presser mechanism including a work engaging presser foot, the improvement comprising an operator influenced presser lifting element on said sewing machine for selectively lifting said presser mechanism to raise said presser foot to a normal lifted position or to a super-elevated position, a latch release element arranged in said sewing machine so as to be raised with said presser mechanism by said presser lifting element, and camming means on said sewing machine frame operatively engageable with said latch release element upon raising movement of said presser mechanism above said normal lifted position for shifting said latch release element into effective position releasing said latch mechanism.
Claim 2
Dependent Claim
151 words
In a sewing machine having a frame, a needle bar endwise reciprocable in said frame, needle bar reciprocating mechanism including a drive link carried in said frame, a latch mechanism carried on said needle bar for selectively coupling said drive link to said needle bar, a presser mechanism including a work engaging presser foot, the improvement comprising an operator influenced presser lifting element on said sewing machine for selectively lifting said presser mechanism to raise said presser foot to a normal lifted position or to a super-elevated position, a latch release element arranged in said sewing machine so as to be raised with said presser mechanism by said presser lifting element, and camming means on said sewing machine frame operatively engageable with said latch release element upon raising movement of said presser mechanism above said normal lifted position for shifting said latch release element into effective position releasing said latch mechanism.
Claim 3
Dependent Claim
111 words
In a sewing machine as set forth in claim 1 in which said latch mechanism on said needle bar includes a latch lever, an arm projecting from said latch lever and partaking of reciprocatory movement within a predetermined plane during needle bar reciprocation in response to said needle bar reciprocating movement, in which said latch release element includes an arm portion extending substantially parallel to said predetermiNed plane of movement of said latch lever arm, and means operative in said effective position of said latch release element for positioning said arm portion within the path of motion of said latch lever arm in any position of reciprocation of said needle bar.
Claim 4
Dependent Claim
143 words
In a sewing machine as set forth in claim 2 in which said means for lifting said presser mechanism includes a first position for influencing a normal raised position of said presser foot and a second position for influencing a super-elevated position of said presser foot, and in which said camming means is arranged to shift said latch release element into effective position releasing said latch mechanism as said presser lifting means is shifted from said first to said second position and in which said latch release element comprises a member pivotally supported on said presser mechanism, in which said camming means is arranged when said presser lifting means is shifted from said first to said second position to engage and turn said pivotally supported latch release element to bring said arm portion within the path of motion of said latch lever arm.
Claim 5
Dependent Claim
34 words
In a sewing machine as set forth in claim 2 in which said arm portion of said latch release element is formed with serrations to engage and sustain said latch lever arm from descending.
Claim 6
Dependent Claim
84 words
In a sewing machine as set forth in claim 4 in which means are provided whereby said latch release arm portion is resiliently shifted into the path of motion of said latch lever arm, and in which said serrations in said latch release arm portion take the form of ratchet teeth with upwardly inclined lower edges to accommodate elevation of said needle bar to the top of its stroke subsequent to release of the latch mechanism in any lower position of the needle bar.
Claim 7
Dependent Claim
37 words
In a sewing machine as set forth in claim 1 in which means are provided effective after release of said latch mechanism, for rendering said presser lifting mechanism effective to impart lifting movement to said needle bar.
Claim 8
Dependent Claim
67 words
In a sewing machine as set forth in claim 1 in which abutment means are provided effective before the presser mechanism attains said second position for limiting the unlatched position to which said latch mechanism may be shifted under the influence of said latch release element for causing said latch release element to elevate said needle bar during movement of said presser foot into said super-elevated position.
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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |