Patent US3834334A successfully refreshed from Google Patents.
US3834334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Work feed control mechanism
Assignee: Singer Co
•
Filing: 1973-06-14
•
Granted: 1974-09-10
•
Expires: 1993-06-14
Abstract
Abstract A stitch length and cam feed mode ratio control mechanism for the work feed regulating system of a sewing machine that includes a feed regulator shaft rotatably mounted in the frame of the machine operably connected to a feed dog and adapted to influence movement imparted thereto so as to cause same to transport work transversely across the work supporting bed of the machine by predetermined incremental distances. A feed regulator lever arm is secured to the regulator shaft. A floating link member is carried at one end thereof by an element associated with the cam feed linkage system and is provided at its other end with a pin positionable along said feed regulator lever arm and engageable therewith. Manually operable means are provided for guiding said pin along the feed regulator lever arm for stitch length selection and for simultaneously establishing the proportionate amount of motion transmitted from the feed cam to the regulator shaft, the radius of curvature of the feed regulator lever arm and path of movement of said pin being such as to enable the positioning of the pin along the lever without effecting angular movement of the said lever arm when a portion of the cam is being tracked which dictates a zero stitch length. The cam, while in any position other than the zero position, causes the pin to be urged against the said lever arm so as to rotate same and the regulator shaft by an amount representative of the radial location of the pin along the lever.
Inventors
- 👤 K Adams
- 👤 W Herron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:20
CPC Classifications
D; D05; D05B; D05B19/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
284 words
In a sewing machine a stitch length and ratio control mechanism for the work feed regulating system, said machine having a frame and a work-supporting bed carried thereby, a feed regulator shaft being rotatably mounted in said frame operably connected to a feed dog and adapted to influence movement imparted thereto so as to cause same to transport work transversely across said bed by predetermined incremental distances, at least one feed cam being mounted in said frame, and a linkage system operatively connecting said cam to said feed regulator shaft, said stitch length and ratio control mechanism comprising an arcuate radially extending feed regulator lever arm secured to said feed regulator shaft and movable angularly therewith, a first element operably associated with said linkage system, a floating link member pivotally supported adjacent one end thereof on said first element, a pin carried adjacent the other end of said floating link member, said pin being positionable along said feed regulator lever arm and engageable therewith, means for guiding said pin to move in a path transversely across said feed regulator lever arm, and manually operable means for selectively shifting said guiding means to move said pin radially along said feed regulator lever arm to thereby simultaneously establish stitch length and the proportionate amount of motion to be transmitted from said feed cam to said feed regulator shaft when operating in the cam mode, the radius of curvature of said feed regulator lever arm at zero stitch length having its center substantially coincident with that of said pivotal support by which said floating link member is supported by said first element when a portion of said cam is being tracked which dictates a zero stitch length.
Claim 2
Dependent Claim
284 words
In a sewing machine a stitch length and ratio control mechanism for the work feed regulating system, said machine having a frame and a work-supporting bed carried thereby, a feed regulator shaft being rotatably mounted in said frame operably connected to a feed dog and adapted to influence movement imparted thereto so as to cause same to transport work transversely across said bed by predetermined incremental distances, at least one feed cam being mounted in said frame, and a linkage system operatively connecting said cam to said feed regulator shaft, said stitch length and ratio control mechanism comprising an arcuate radially extending feed regulator lever arm secured to said feed regulator shaft and movable angularly therewith, a first element operably associated with said linkage system, a floating link member pivotally supported adjacent one end thereof on said first element, a pin carried adjacent the other end of said floating link member, said pin being positionable along said feed regulator lever arm and engageable therewith, means for guiding said pin to move in a path transversely across said feed regulator lever arm, and manually operable means for selectively shifting said guiding means to move said pin radially along said feed regulator lever arm to thereby simultaneously establish stitch length and the proportionate amount of motion to be transmitted from said feed cam to said feed regulator shaft when operating in the cam mode, the radius of curvature of said feed regulator lever arm at zero stitch length having its center substantially coincident with that of said pivotal support by which said floating link member is supported by said first element when a portion of said cam is being tracked which dictates a zero stitch length.
Claim 3
Dependent Claim
91 words
A machine according to claim 1 wherein said first element operatively associated with said linkage system comprises a lever, means pivotally supporting said lever relative to said sewing machine on an axis which is located substantially along a straight line joining said pin when it is adjusted to an extreme position radially outwardly along said feed regulator lever arm and said pivotal support by which said floating link member is supported by said first element when a portion of said feed cam is being tracked which dictates a zero stitch length.
Claim 4
Dependent Claim
95 words
A machine according to claim 1, wherein said manually operable means includes a selector dial coupled to a cylindrical cam member provided with a generally spiral peripheral cam track and said pin guiding means includes a first bell crank pivotally mounted in the frame of said machine, a cam follower being carried by said bell crank cooperable with said cam track to determine the pivotal movement of said bell crank, said bell crank being further provided with a guide slot on one arm thereof dimensioned to slidably receive the pin on said floating link member.
Claim 5
Dependent Claim
64 words
A machine according to claim 3, wherein said first element comprises a second bell crank, one arm of said second bell crank having a sector gear formed at the end thereof, said linkage system being operatively connected to said sector gear by means of a cooperable second sector gear, said floating link member being supported by the other arm of said second bell crank.
Claim 6
Dependent Claim
224 words
A machine according to claim 3, wherein said selector dial is provided with a depending shaft, said cylindrical cam having an axially extending keyway therethrough, said depending shaft extending slidably but non-rotatably through said keyway and cooperable therewith to impart rotative motion to said cylindrical cam upon rotation of said selector dial, a spring biased pivot shaft being journaled in said machine beneath said depending shaft, a block being affixed to said pivot shaft having an arm integral therewith positioned directly below the lower terminus of said depending shaft and urged towards said shaft, a link member secured at one end thereof to a portion of said pivot shaft remote from said block, the othere end of said link member being connected slidably within a slot formed in a slotted lever, a head section surmounting said feed regulator lever arm secured to said regulator shaft, said slotted lever being affixed to said head section and extending generally radially of said regulator shaft, whereby depression of said selector dial causes the lower terminus of the depending shaft to engage with the said arm on said pivot shaft to effectuate rotation of said shaft, pivotal movement of said link and pivotal movement of said slotted lever about the regulator shaft to thereby rotate said regulator shaft and impart a quick reverse movement to the feed dog.
Claim 7
Dependent Claim
35 words
A machine according to claim 5, wherein rotation of said selector dial causes movement of said slotted lever and a repositioning of the slot thereof relative to the end of said link member connected therein.
Claim 8
Dependent Claim
42 words
A machine according to claim 1, wherein means are provided for biasing said feed regulator lever arm in the forward feed direction, the pin member on said floating link member being slidable along the convex surface of said feed regulator lever arm.
References Cited (Backward Citations)
US2986107A
Cited
US3065716A
Cited
US3108555A
Cited
US3131658A
Cited
US3081724A
Cited
US3221573A
Cited
US3455258A
Cited
US3638593A
Cited
US3766871A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |