US3716007A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic stitch-cutting mechanism for bag-closing sewing machines
Assignee: Dave Fischbein Manufacturing Co
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Filing: 1972-03-31
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Granted: 1973-02-13
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Expires: 1992-03-31
Abstract
Abstract A mechanism for automatically and successively cutting the thread chain in a bag-closing sewing machine after the upper edges of each bag are stitched together which essentially employs: (a) a novel and special throat plate cooperating with the presser foot of the sewing machine for receiving and guiding the upper edges of filled bags as they are moved through the machine by carrier means, and for accommodating and assuring the cooperation of the needle mechanism and looper mechanism to stitch horizontally the upper edges in said guiding action; (b) at the bag delivery end of the throat plate an outwardly protruding bag-edge guiding ramp is provided, extending horizontally and spaced outwardly from the main body of the throat plate and joined with the body in an inclined, outwardly projected juncture and thereafter extending for a short distance in substantially planar form to an abrupt outer end; (c) a thread chain receiving slot extending longitudinally therein through said ramp and open at the bag delivery end of said ramp whereby stitching produced by the machine immediately following the trailing end of each stitched bag is automatically engaged in said slot and moved outwardly a slight distance with the trailing bag; (d) a thread chain cutting mechanism mounted inwardly of the ramp or at least its outer portion and comprising a movable sharp edge blade operating in a general plane perpendicularly of said slot and in position inwardly of said ramp; (e) and driving connections between the shiftable cutter blade and a powered element of the sewing machine to cause operation of the blade for each cycle of operation of the general components of the sewing machine.
Inventors
- 👤 S Shark
- 👤 H Fischbein
- 👤 I Fischbein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:08
CPC Classifications
D; D05; D05B; D05B65/00; D10; D10B; D10B2505/00; D10B2505/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
344 words
For use with a sewing machine of the type for stitching together and closing the lapped upper edges of filled bags and sacks where continuous stitching in a horizontal line is effected and where advance of the material stitched is accomplished solely by a feed dog and presser foot mechanism working in cooperation with a stationary bag-edge-guiding, throat plate, and wherein said machine includes a conveyor for causing filled bags to travel through a horizontal course at a speed synchronized with the advance of the bags during stitching, mechanism for automatically cutting the thread chain produced by said sewing machine after sequential stitchings of said horizontally moved filled bags are respectively completed, having in combination: the guiding surface of said throat plate having a receiving end and a delivery or trailing end, a mounting structure rigidly attached to the delivery or trailing end of said throat plate, a stationary bag-edge guiding ramp constituting a part of said mounting structure and extending convergingly from the trailing end of said throat plate for a relatively short distance and diverging outwardly therefrom, said ramp comprising two parallel, generally horizontally extending tracks defining therebetween a deep, straight slot horizontally aligned with the line of stitching of the machine, said tracks in operation of the machine guiding the stitched edges of bags along a path disposed outwardly of the line of stitching of the machine and ending abruptly at the track ends opposite from said convergence with said throat plate, whereby the trailing upper edges of stitched bags successively and automatically drop inwardly towards the housing of said machine, causing the line of stitching to positively be disposed in said deep recess, thread cutting mechanism mounted inwardly of said ramp and having a movable sharp-edge blade operating in a plane generally perpendicular to said slot for cutting said thread chain whenever said thread chain is moving within said slot, and driving connections between said blade and a powered element of said sewing machine for operating said blade for each cycle of operation of the components of said sewing machine.
Claim 2
Dependent Claim
344 words
For use with a sewing machine of the type for stitching together and closing the lapped upper edges of filled bags and sacks where continuous stitching in a horizontal line is effected and where advance of the material stitched is accomplished solely by a feed dog and presser foot mechanism working in cooperation with a stationary bag-edge-guiding, throat plate, and wherein said machine includes a conveyor for causing filled bags to travel through a horizontal course at a speed synchronized with the advance of the bags during stitching, mechanism for automatically cutting the thread chain produced by said sewing machine after sequential stitchings of said horizontally moved filled bags are respectively completed, having in combination: the guiding surface of said throat plate having a receiving end and a delivery or trailing end, a mounting structure rigidly attached to the delivery or trailing end of said throat plate, a stationary bag-edge guiding ramp constituting a part of said mounting structure and extending convergingly from the trailing end of said throat plate for a relatively short distance and diverging outwardly therefrom, said ramp comprising two parallel, generally horizontally extending tracks defining therebetween a deep, straight slot horizontally aligned with the line of stitching of the machine, said tracks in operation of the machine guiding the stitched edges of bags along a path disposed outwardly of the line of stitching of the machine and ending abruptly at the track ends opposite from said convergence with said throat plate, whereby the trailing upper edges of stitched bags successively and automatically drop inwardly towards the housing of said machine, causing the line of stitching to positively be disposed in said deep recess, thread cutting mechanism mounted inwardly of said ramp and having a movable sharp-edge blade operating in a plane generally perpendicular to said slot for cutting said thread chain whenever said thread chain is moving within said slot, and driving connections between said blade and a powered element of said sewing machine for operating said blade for each cycle of operation of the components of said sewing machine.
Claim 3
Dependent Claim
344 words
For use with a sewing machine of the type for stitching together and closing the lapped upper edges of filled bags and sacks where continuous stitching in a horizontal line is effected and where advance of the material stitched is accomplished solely by a feed dog and presser foot mechanism working in cooperation with a stationary bag-edge-guiding, throat plate, and wherein said machine includes a conveyor for causing filled bags to travel through a horizontal course at a speed synchronized with the advance of the bags during stitching, mechanism for automatically cutting the thread chain produced by said sewing machine after sequential stitchings of said horizontally moved filled bags are respectively completed, having in combination: the guiding surface of said throat plate having a receiving end and a delivery or trailing end, a mounting structure rigidly attached to the delivery or trailing end of said throat plate, a stationary bag-edge guiding ramp constituting a part of said mounting structure and extending convergingly from the trailing end of said throat plate for a relatively short distance and diverging outwardly therefrom, said ramp comprising two parallel, generally horizontally extending tracks defining therebetween a deep, straight slot horizontally aligned with the line of stitching of the machine, said tracks in operation of the machine guiding the stitched edges of bags along a path disposed outwardly of the line of stitching of the machine and ending abruptly at the track ends opposite from said convergence with said throat plate, whereby the trailing upper edges of stitched bags successively and automatically drop inwardly towards the housing of said machine, causing the line of stitching to positively be disposed in said deep recess, thread cutting mechanism mounted inwardly of said ramp and having a movable sharp-edge blade operating in a plane generally perpendicular to said slot for cutting said thread chain whenever said thread chain is moving within said slot, and driving connections between said blade and a powered element of said sewing machine for operating said blade for each cycle of operation of the components of said sewing machine.
Claim 4
Dependent Claim
344 words
For use with a sewing machine of the type for stitching together and closing the lapped upper edges of filled bags and sacks where continuous stitching in a horizontal line is effected and where advance of the material stitched is accomplished solely by a feed dog and presser foot mechanism working in cooperation with a stationary bag-edge-guiding, throat plate, and wherein said machine includes a conveyor for causing filled bags to travel through a horizontal course at a speed synchronized with the advance of the bags during stitching, mechanism for automatically cutting the thread chain produced by said sewing machine after sequential stitchings of said horizontally moved filled bags are respectively completed, having in combination: the guiding surface of said throat plate having a receiving end and a delivery or trailing end, a mounting structure rigidly attached to the delivery or trailing end of said throat plate, a stationary bag-edge guiding ramp constituting a part of said mounting structure and extending convergingly from the trailing end of said throat plate for a relatively short distance and diverging outwardly therefrom, said ramp comprising two parallel, generally horizontally extending tracks defining therebetween a deep, straight slot horizontally aligned with the line of stitching of the machine, said tracks in operation of the machine guiding the stitched edges of bags along a path disposed outwardly of the line of stitching of the machine and ending abruptly at the track ends opposite from said convergence with said throat plate, whereby the trailing upper edges of stitched bags successively and automatically drop inwardly towards the housing of said machine, causing the line of stitching to positively be disposed in said deep recess, thread cutting mechanism mounted inwardly of said ramp and having a movable sharp-edge blade operating in a plane generally perpendicular to said slot for cutting said thread chain whenever said thread chain is moving within said slot, and driving connections between said blade and a powered element of said sewing machine for operating said blade for each cycle of operation of the components of said sewing machine.
Claim 5
Dependent Claim
33 words
The structure and combination set forth in claim 1 wherein said thread cutting mechanism comprises in combination with said movable blade, a stationary, sharp-edged bedknife disposed in shearing relation to the movable blade.
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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) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |