US3683831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic guiding apparatus for sewing machine
Assignee: Individual
•
Filing: 1969-08-18
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Granted: 1972-08-15
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Expires: 1989-08-18
Abstract
Abstract An apparatus for guiding work past a sewing machine needle along a predetermined path to form a line of stitching corresponding to the path with deviations of the work from a normal feed path to the needle being sensed and causing a pivotal movement of the work about the needle to overcome the deviation. The ability of the apparatus to correct the deviation is related to the speed of sewing and to maintain this sewing speed within the deviation correcting ability there are fast and slow sewing speeds and sensing means that senses the occurrence of a large deviation and decreases the sewing speed to the slow speed to enable the apparatus to correct the deviation. For sewing a line of stitching a preselected distance from the edge of a workpiece, the vertical axis on which the work is pivoted is slightly tilted so that the workpiece is positioned to have the portion of its edge at the needle normally extend transversely beyond the needle a distance greater than the preselected distance from the needle. The edge of the workpiece engages the guide and is forced to be the preselected transverse distance from the needle. The apparatus utilizes a method when the work is two plies of cloth that are to be sewed together of holding the plies at a plurality of spaced points and feeding it at a determined rate while the feed dogs of the sewing machine are set to advance the cloth at a faster rate. The presser foot is made to exert only a light pressure on the cloth to permit slippage therebetween in order to minimize relative shifting and stretching of the two plies as they are sewn together with stitches having a stitch length determined by the rate of the apparatus.
Inventors
- 👤 Ernest M Junkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:47
CPC Classifications
D; D05; D05B; D05B69/00; D05B19/00; D05B19/02; D05B19/12; D05B19/16; D05B27/00; D05B27/02; D05B27/10; D05B3/00; D05D; D05D2203/00; D05D2305/00; D05D2305/02; D05D2305/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
172 words
In an apparatus for guiding work along a predetermined path with respect to a sewing machine having a needle to form a line of stitching corresponding to the path, said apparatus including a work holder for holding the work, drive means for moving the work holder and driving the sewing machine, means for sensing the deviation of the work holder from the normal feed path to the needle and means responsive to the sensing means for pivoting the work holder about the needle to overcome the deviation, the improvement comprising said drive means having at least a fast and a slow speed, additional means for sensing the extent of the deviation including means for altering the speed of the drive means in response to the extent of the deviation, in which the apparatus includes a cam that moves with the work holder and has a surface essentially corresponding to the predetermined path and in which the additional means includes means bearing against the surface to continuously monitor the extent of the deviation.
Claim 2
Dependent Claim
172 words
In an apparatus for guiding work along a predetermined path with respect to a sewing machine having a needle to form a line of stitching corresponding to the path, said apparatus including a work holder for holding the work, drive means for moving the work holder and driving the sewing machine, means for sensing the deviation of the work holder from the normal feed path to the needle and means responsive to the sensing means for pivoting the work holder about the needle to overcome the deviation, the improvement comprising said drive means having at least a fast and a slow speed, additional means for sensing the extent of the deviation including means for altering the speed of the drive means in response to the extent of the deviation, in which the apparatus includes a cam that moves with the work holder and has a surface essentially corresponding to the predetermined path and in which the additional means includes means bearing against the surface to continuously monitor the extent of the deviation.
Claim 3
Dependent Claim
24 words
The invention as defined in claim 1 in which the additional means includes a switch and the bearing means includes a switch operating arm.
Claim 4
Dependent Claim
229 words
In an apparatus for guiding work along a predetermined path with respect to a sewing machine having a needle to form a line of stitching corresponding to the path, said apparatus including a work holder for holding the work, drive means for moving the work holder and driving the sewing machine, means for sensing the deviation of the work holder from the normal feed path to the needle and means responsive to the sensing means for pivoting the work holder about the needle to overcome the deviation, the improvement comprising said drive means having at least a fast and a slow speed, additional means for sensing the extent of the deviation, including means for altering the speed of the drive means in response to the extent of the deviation, in which the work holder moves past the needle along the predetermined path and in which the additional means is positioned ahead of the needle to sense the deviation at a point of the path prior to the point being at the needle and in which the additional means includes means positioned behind the needle in the direction of the path, the deviation can be in one or another direction and in which deviation in one direction is sensed in the path prior to the needle and deviation in the other direction sensed in the path subsequent to the needle.
Claim 5
Dependent Claim
229 words
In an apparatus for guiding work along a predetermined path with respect to a sewing machine having a needle to form a line of stitching corresponding to the path, said apparatus including a work holder for holding the work, drive means for moving the work holder and driving the sewing machine, means for sensing the deviation of the work holder from the normal feed path to the needle and means responsive to the sensing means for pivoting the work holder about the needle to overcome the deviation, the improvement comprising said drive means having at least a fast and a slow speed, additional means for sensing the extent of the deviation, including means for altering the speed of the drive means in response to the extent of the deviation, in which the work holder moves past the needle along the predetermined path and in which the additional means is positioned ahead of the needle to sense the deviation at a point of the path prior to the point being at the needle and in which the additional means includes means positioned behind the needle in the direction of the path, the deviation can be in one or another direction and in which deviation in one direction is sensed in the path prior to the needle and deviation in the other direction sensed in the path subsequent to the needle.
Claim 6
Dependent Claim
160 words
In an apparatus for guiding work along a predetermined path with respect to a sewing machine having a needle to form a line of stitching corresponding to at least some of the path, said apparatus including a work holder for holding the work, drive means for moving the work holder and driving the sewing machine, means for sensing the deviation of the work holder from the normal feed path to the needle and means responsive to the sensing means for pivoting the work holder about the needle to overcome the deviation, the improvement comprising said drive means having at least a fast and a slow speed, additional means for continually sensing the extent of the deviation on both sides of the feed path of the work holder and including means for altering the speed of the drive means in response to the extent of the deviation, said additional means further maintaining a fast speed when the deviation is relatively small.
Claim 7
Dependent Claim
160 words
In an apparatus for guiding work along a predetermined path with respect to a sewing machine having a needle to form a line of stitching corresponding to at least some of the path, said apparatus including a work holder for holding the work, drive means for moving the work holder and driving the sewing machine, means for sensing the deviation of the work holder from the normal feed path to the needle and means responsive to the sensing means for pivoting the work holder about the needle to overcome the deviation, the improvement comprising said drive means having at least a fast and a slow speed, additional means for continually sensing the extent of the deviation on both sides of the feed path of the work holder and including means for altering the speed of the drive means in response to the extent of the deviation, said additional means further maintaining a fast speed when the deviation is relatively small.
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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |