US3894499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bobbin thread guide means
Assignee: White Sewing Machine Corp
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Filing: 1974-07-05
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Granted: 1975-07-15
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Expires: 1994-07-05
Abstract
Abstract Bobbin thread guide means for feeding thread in a zig-zag sewing machine to the needle area from a point along the work feed direction centered with respect to the lateral positions of the needle to avoid irregular stitches of variable loop length during zig-zag sewing. The centered first guide point is fixed on a bobbin carrier adjacent the needle, while a second guide point is provided on the carrier diametrically opposite the first guide point, and, in a conventional manner, lateral of the line of work feed. Bobbin thread is manually positioned in the centered guide point for zig-zag sewing, and is manually withdrawn from this first guide point and allowed to be fed laterally to the work area from the second guide point to avoid hitch stitches during straight sewing.
Inventors
- 👤 Sidney J Hamlett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:45
CPC Classifications
D; D05; D05B; D05B57/00; D05B57/08; D05B57/10; D05B57/14; D05B57/143
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
216 words
In a zig-zag sewing machine, a work area including a throat plate, the throat plate having a needle receiving aperture, means for feeding work along the throat plate in a feed direction, a needle adapted to oscillate laterally of the feed direction from one side of the aperture to the other between stitches, a loop taker mounted on the machine for rotation about a generally vertical axis, the loop taker being disposed below the plane of the throat plate and generally forwardly of the needle aperture, a bobbin carrier, means supporting the bobbin carrier within the rotating loop taker, a bobbin rotatably supported within the bobbin carrier, manually selectable bobbin thread guide means having a first mode for feeding the bobbin thread from a point lateral of the feed path whereby during normal sewing the needle descends on one side of the bobbin thread during successive stitches to avoid irregular stitch formation, said guide means having a second mode for feeding the bobbin from a second point substantially centered on the feed path and mid position of the needle whereby the angularity of the bobbin thread between the second mode feed point and either needle side position in zig-zag sewing operation relative to the feed line is substantially the same and uniform stitch formation is achieved.
Claim 2
Dependent Claim
216 words
In a zig-zag sewing machine, a work area including a throat plate, the throat plate having a needle receiving aperture, means for feeding work along the throat plate in a feed direction, a needle adapted to oscillate laterally of the feed direction from one side of the aperture to the other between stitches, a loop taker mounted on the machine for rotation about a generally vertical axis, the loop taker being disposed below the plane of the throat plate and generally forwardly of the needle aperture, a bobbin carrier, means supporting the bobbin carrier within the rotating loop taker, a bobbin rotatably supported within the bobbin carrier, manually selectable bobbin thread guide means having a first mode for feeding the bobbin thread from a point lateral of the feed path whereby during normal sewing the needle descends on one side of the bobbin thread during successive stitches to avoid irregular stitch formation, said guide means having a second mode for feeding the bobbin from a second point substantially centered on the feed path and mid position of the needle whereby the angularity of the bobbin thread between the second mode feed point and either needle side position in zig-zag sewing operation relative to the feed line is substantially the same and uniform stitch formation is achieved.
Claim 3
Dependent Claim
77 words
A zig-zag sewing machine as set forth in claim 1, wherein said manually selectable bobbin thread guide means comprises a first guide point fixed on the bobbin carrier in a zone diametrically opposite the needle and lateral of the feed path through a mid position of the needle, and a second guide point fixed on the bobbin carrier in a zone adjacent the needle and on the line of feed through the mid position of the needle.
Claim 4
Dependent Claim
208 words
In a zig-zag sewing machine, a work area including a throat plate, the throat plate having a needle receiving aperture, means for feeding the work along the throat plate in a feed direction, a needle adapted to oscillate laterally of the feed direction from one side of the aperture to the other between stitches, a loop taker mounted on the machine for rotation about a generally vertical axis, the loop taker being disposed below the plane of the throat plate and generally forwardly of the needle aperture, a bobbin carrier, means supporting the bobbin carrier within the rotating loop taker, a bobbin rotatably supported within the bobbin carrier, said bobbin carrier having an upper edge, said bobbin having an upper side substantially coplanar with the upper edge of the bobbin carrier, bobbin thread guide means for feeding the bobbin thread to the needle area, said guide means including a guide eyelet fixed on the bobbin carrier at said upper edge at a point substantially centered on the feed path and mid position of the needle, whereby the angularity of bobbin thread between said point and either needle side position in zig-zag sewing operation relative to the feed line is substantially the same and uniform stitch formation is achieved.
Claim 5
Dependent Claim
208 words
In a zig-zag sewing machine, a work area including a throat plate, the throat plate having a needle receiving aperture, means for feeding the work along the throat plate in a feed direction, a needle adapted to oscillate laterally of the feed direction from one side of the aperture to the other between stitches, a loop taker mounted on the machine for rotation about a generally vertical axis, the loop taker being disposed below the plane of the throat plate and generally forwardly of the needle aperture, a bobbin carrier, means supporting the bobbin carrier within the rotating loop taker, a bobbin rotatably supported within the bobbin carrier, said bobbin carrier having an upper edge, said bobbin having an upper side substantially coplanar with the upper edge of the bobbin carrier, bobbin thread guide means for feeding the bobbin thread to the needle area, said guide means including a guide eyelet fixed on the bobbin carrier at said upper edge at a point substantially centered on the feed path and mid position of the needle, whereby the angularity of bobbin thread between said point and either needle side position in zig-zag sewing operation relative to the feed line is substantially the same and uniform stitch formation is achieved.
Claim 6
Dependent Claim
24 words
A sewing machine as set forth in claim 3, wherein said eyelet is fixed on a side of the bobbin carrier adjacent the needle.
Claim 7
Dependent Claim
152 words
A bobbin carrier for a zig-zag sewing machine, comprising a body having a generally cylindrical recess for receiving a bobbin, means on the bobbin carrier for engagement with supporting surfaces of a rotating loop taker and permitting relative rotation therebetween, means in said recess for rotatably supporting a bobbin therein, said body having an upper side substantially coplanar with an upper face of the bobbin received in said recess, thread guide means on said body for directing thread from the bobbin to a stitching station in the machine, a bobbin thread tension adjustment spring on the body, said thread guide means including a first guide point fixed on the body adjacent said thread tension spring, said thread guide means including a second guide point diametrically opposite said first guide point, said second guide point being provided by a slotted eyelet, said slotted eyelet being disposed at said upper side of said body.
Claim 8
Dependent Claim
152 words
A bobbin carrier for a zig-zag sewing machine, comprising a body having a generally cylindrical recess for receiving a bobbin, means on the bobbin carrier for engagement with supporting surfaces of a rotating loop taker and permitting relative rotation therebetween, means in said recess for rotatably supporting a bobbin therein, said body having an upper side substantially coplanar with an upper face of the bobbin received in said recess, thread guide means on said body for directing thread from the bobbin to a stitching station in the machine, a bobbin thread tension adjustment spring on the body, said thread guide means including a first guide point fixed on the body adjacent said thread tension spring, said thread guide means including a second guide point diametrically opposite said first guide point, said second guide point being provided by a slotted eyelet, said slotted eyelet being disposed at said upper side of said body.
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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) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |