US3812801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic drive system for a sewing machine
Assignee: Individual
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Filing: 1973-01-19
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Granted: 1974-05-28
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Expires: 1993-01-19
Abstract
Abstract A pneumatic drive system for controlling the stitching direction of a sewing machine including a base and having a needle bar with a sewing needle driven between uppermost and lowermost position by a motor connected to the sewing machine through a clutch comprising a main air supply, a clutch air control cylinder, a clevis assembly connecting between the clutch air control cylinder and the clutch a four-way air control valve, and various pneumatic lines interconnecting the clutch air control cylinder, the four-way air control valve and a main air regulator that connects to the main air supply, so that the sewing needle sews straight stitches as a foot pedal is depressed closing the various pneumatic lines between the main air supply and clutch air control cylinder and releasing the clutch. A brain member connects to the machine, and a jet sensor is attached to the brain member and has a structure defining a substantially Ushaped member having at least one opening in each arm through which air from the brain member flows. Various pneumatic lines and regulator valves interconnect with the main air regulator and are closed to the main air supply as a second pedal is depressed to send air to the brain member. A flag member breaks the flow of air through the openings in the arms which causes a number of flow control valves and booster valves interconnected by pneumatic lines to cause the base of the machine to oscillate and cause the sewing machine to reciprocate and sew zig-zag stitches.
Inventors
- 👤 N Lukowicz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:58
CPC Classifications
D; D05; D05B; D05B69/00; D05B69/22
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
353 words
A pneumatic drive system for controlling the stitching direction of a sewing machine including a base and having a needle bar with a sewing needle driven between uppermost and lowermost position by a motor connected to the sewing machine through a clutch, comprising a main air supply, means connected to said main air supply for actuating said clutch to start said sewing needle of said machine sewing straight stitches, and means for causing said sewing machine to reciprocate and sew zig-zag stitches, said means for actuating said clutch comprising a clutch air control cylinder, a clevis assembly connecting between said clutch air control cylinder and said clutch, a four-way air control valve, a first pneumatic line and a second pneumatic line each connecting between said air control valve and said clutch air control cylinder, a third pneumatic line connecting said main air supply and said air control valve, and means for releasing air from said main air supply line to said air control valve to release said air to said clutch air control cylinder causing said air control cylinder to engage said clevis assembly and release said clutch, said means for releasing air from said main air supply to said air control valve comprising a main air regulator connected within said third pneumatic line, and a pedal connected within said third pneumatic line between said main air regulator and said air control valve so that when said pedal is depressed said air is released to said air control valve, said means for causing said sewing machine to reciprocate and sew zig-zag stitches comprising a brain member connected to said machine, a jet sensor attached to said brain member and including a structure defining a substantially U-shaped member having at least one opening in each arm through which said air from said brain member flows, means for releasing air to said brain member, means for breaking the flow of air through said opening, and means for responding to said breaking of flow of air to cause said base of said machine to oscillate and cause said sewing machine to reciprocate and sew zig-zag stitches.
Claim 2
Dependent Claim
353 words
A pneumatic drive system for controlling the stitching direction of a sewing machine including a base and having a needle bar with a sewing needle driven between uppermost and lowermost position by a motor connected to the sewing machine through a clutch, comprising a main air supply, means connected to said main air supply for actuating said clutch to start said sewing needle of said machine sewing straight stitches, and means for causing said sewing machine to reciprocate and sew zig-zag stitches, said means for actuating said clutch comprising a clutch air control cylinder, a clevis assembly connecting between said clutch air control cylinder and said clutch, a four-way air control valve, a first pneumatic line and a second pneumatic line each connecting between said air control valve and said clutch air control cylinder, a third pneumatic line connecting said main air supply and said air control valve, and means for releasing air from said main air supply line to said air control valve to release said air to said clutch air control cylinder causing said air control cylinder to engage said clevis assembly and release said clutch, said means for releasing air from said main air supply to said air control valve comprising a main air regulator connected within said third pneumatic line, and a pedal connected within said third pneumatic line between said main air regulator and said air control valve so that when said pedal is depressed said air is released to said air control valve, said means for causing said sewing machine to reciprocate and sew zig-zag stitches comprising a brain member connected to said machine, a jet sensor attached to said brain member and including a structure defining a substantially U-shaped member having at least one opening in each arm through which said air from said brain member flows, means for releasing air to said brain member, means for breaking the flow of air through said opening, and means for responding to said breaking of flow of air to cause said base of said machine to oscillate and cause said sewing machine to reciprocate and sew zig-zag stitches.
Claim 3
Dependent Claim
68 words
The drive system of claim 1, wherein said means for breaking the flow of air through said opening includes a flag member attached to said needle bar and situated such that when said bar is driven between uppermost and lowermost position by said motion, said flag member passes through said arms of said U-shaped jet sensor to break the flow of air from said opening in each arm.
Claim 4
Dependent Claim
175 words
The drive system of claim 1, wherein said means for releasing air to said brain member includes a second pedal, a fourth pneumatic line connecting between said main air regulator and said second pedal, a fifth pneumatic line connecting between said second pedal and said brain member, a sixth pneumatic line connecting between said second pedal, and said brain member, a first regulator valve connecting within said sixth pneumatic line between said brain member and said second pedal, a seventh pneumatic line connecting to said brain member and to said sixth line between said first regulator valve and said second pedal, a second air regulator valve connecting within said seventh pneumatic line, an eighth pneumatic line connecting to said brain member and to said sixth line and said second pedal, and a third air regulator valve connecting within said eighth pneumatic line whereby when said second pedal is depressed air is conducted from said main air regulator through said fourth pneumatic line to said brain member by said fifth, sixth, seventh and eighth pneumatic lines.
Claim 5
Dependent Claim
192 words
The drive system of claim 3, wherein said means for responding to said breaking of the flow of air to cause said base of said machine to oscillate and cause sewing of zig-zag stitches includes a machine oscillation cylinder having a piston within, a connecting bar attached to said base of said machine and to said piston, a ninth pneumatic line connected between said main air regulator and said machine oscillation cylinder, a first flow control valve connected within said ninth pneumatic line between said oscillation cylinder and said air regulator, a first booster valve connected within said ninth pneumatic line between said first contrOl valve and said air regulator, a tenth pneumatic line connecting from said oscillation cylinder to said ninth pneumatic line between said first booster valve and said air regulator, a second booster valve connecting within said tenth pneumatic line, a second flow control valve connecting within said tenth pneumatic line between said second booster valve and said oscillation cylinder, an eleventh pneumatic line connecting from said second booster valve to said brain member and a twelfth pneumatic line connecting from said first booster valve to said brain member.
Claim 6
Dependent Claim
225 words
The drive system of claim 4, wherein said brain member comprises said sixth pneumatic line connecting to said jet sensor, a binary counter connecting to said seventh pneumatic line, a thirteenth pneumatic line connecting from said jet sensor to said binary counter, a first amplifier air valve, a fourteenth pneumatic line connecting between said binary counter and said first amplifier air valve, a second amplifier air valve, a fifteenth pneumatic line connecting between said binary counter and said second amplifier a air valve, said fifth line connecting to said fifteenth line within said second amplifier valve and connecting to said eighth line which connects to said fourteenth line within said first amplifier air valve, said eighth line also connecting between said first amplifier air valve and said eleventh and said twelfth lines so that said binary counter causes switching of air impulses to said first and said second amplifier air valvues as said thirteenth line detects the breaking of air flow across said jet sensor by said flag member, which changes the direction of said piston within said oscillation cylinder by fluctuating air pressure through said eleventh line, said second booster valve, said tenth line, said second flow control valve, said twelfth line, said first booster valve, said first control valve causing said machine to move in a zig zag fashion and sew zig-zag stitches.
Claim 7
Dependent Claim
187 words
A pneumatic drive system for controlling the stitching direction of a sewing machine including a base and having a needle bar with a sewing needle driven between uppermost and lowermost position by a motor connected to the sewing machine through a clutch, comprising a main air supply, means connected to said main air supply for actuating said clutch to start said sewing needle of said machine sewing straight stitches, and means for causing said sewing machine to reciprocate and sew zig-zag stitches, said means for causing said sewing machine to reciprocate and sew zig-zag stitches comprising a brain member connected to said machine, a jet sensor attached to said brain member and including a structure defining a substantially unitary U-shaped member having at least one opening in each arm through which said arm from said brain member flows, means for releasing air to said brain member, means for breaking the flow of air through said opening, and means or responding to said breaking of flow of air to cause said base of said machine to oscillate and cause said sewing machine to reciprocate and sew zig-zag stitches.
Claim 8
Dependent Claim
187 words
A pneumatic drive system for controlling the stitching direction of a sewing machine including a base and having a needle bar with a sewing needle driven between uppermost and lowermost position by a motor connected to the sewing machine through a clutch, comprising a main air supply, means connected to said main air supply for actuating said clutch to start said sewing needle of said machine sewing straight stitches, and means for causing said sewing machine to reciprocate and sew zig-zag stitches, said means for causing said sewing machine to reciprocate and sew zig-zag stitches comprising a brain member connected to said machine, a jet sensor attached to said brain member and including a structure defining a substantially unitary U-shaped member having at least one opening in each arm through which said arm from said brain member flows, means for releasing air to said brain member, means for breaking the flow of air through said opening, and means or responding to said breaking of flow of air to cause said base of said machine to oscillate and cause said sewing machine to reciprocate and sew zig-zag stitches.
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) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |