Patent US3601073A successfully refreshed from Google Patents.
US3601073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sewing machines
Assignee: Newey Goodman Ltd
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Filing: 1969-06-20
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Granted: 1971-08-24
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Expires: 1989-06-20
Abstract
Abstract A lockstitch sewing machine including a bobbin holder capable of receiving a bobbin with a part movable to a signalling position when there is little or no thread on the bobbin but held in a normal position by the thread when there is more than a little thread on the bobbin, the machine being characterized in that it is provided with sensing means capable of sensing the position of the movable part of such a bobbin and operative to produce a characteristic signal when the part is in its signalling position.
Inventors
- 👤 William Leslie Simpson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:45
CPC Classifications
D; D05; D05B; D05B51/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
205 words
A lockstitch sewing machine including a bobbin holder and provided with a bobbin having a spindle on which bobbin thread can be wound and a part movable from a normal position to a signalling state, the presence of more than a little bobbin thread on the spindle, retaining the movable part in its normal position and thus preventing such movement, the machine also being provided with sensing means comprising a mechanical probe and operating means for causing the probe to approach the movable part of the bobbin intermittently when the machine is in use and to be spaced from such part when the bobbin thread is being passed through the loop of needle thread during the formation of each stitch, movement of the probe being restricted by engagement with the movable part of the bobbin when said movable part is in its normal position, such movement not being so restricted when the movable part is in its signalling state, and means operative to produce a characteristic signal when said probe approaches the movable part of the bobbin and its movement is not restricted by the presence of the movable part of the bobbin in its normal position, said movable part being in its signalling state.
Claim 2
Dependent Claim
205 words
A lockstitch sewing machine including a bobbin holder and provided with a bobbin having a spindle on which bobbin thread can be wound and a part movable from a normal position to a signalling state, the presence of more than a little bobbin thread on the spindle, retaining the movable part in its normal position and thus preventing such movement, the machine also being provided with sensing means comprising a mechanical probe and operating means for causing the probe to approach the movable part of the bobbin intermittently when the machine is in use and to be spaced from such part when the bobbin thread is being passed through the loop of needle thread during the formation of each stitch, movement of the probe being restricted by engagement with the movable part of the bobbin when said movable part is in its normal position, such movement not being so restricted when the movable part is in its signalling state, and means operative to produce a characteristic signal when said probe approaches the movable part of the bobbin and its movement is not restricted by the presence of the movable part of the bobbin in its normal position, said movable part being in its signalling state.
Claim 3
Dependent Claim
26 words
A lockstitch sewing machine according to claim 1 in which there is a removable cover for the bobbin holder, the probe being mounted on said cover.
Claim 4
Dependent Claim
40 words
A lockstitch sewing machine according to claim 1 in which the operating means is such as to cause the probe to approach the movable part of the bobbin only at intervals, each interval being of a predetermined number of stitches.
Claim 5
Dependent Claim
125 words
A lockstitch sewing machine according to claim 1 in which the operating means comprises a rotatable cam coupled to the drive of the machine and having a hole, there being a cam follower operatively coupleD to the probe in such a manner that the follower can enter the hole to only a limited extent when the movable part of the bobbin is in its normal position and the movement of the probe is restricted by the contact between the probe and the movable part of the bobbin, but the follower can enter the hole more deeply when the movable part is in its signalling state and the movement of the probe is no longer restricted by the presence of the movable part of the bobbin.
Claim 6
Dependent Claim
66 words
A lockstitch sewing machine according to claim 1 in which there is a broad outwardly directed flange at one end of the bobbin spindle and a stop at the other end thereof, the movable part of the bobbin comprising an annular plate similar in extent to the broad flange, slidable lengthwise of the spindle and being retained on the spindle by the flange and the stop.
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) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |