US3667410A - Drive and control system in sewing machines producing groups of stitches - Google Patents

Drive and control system in sewing machines producing groups of stitches Download PDF

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Publication number
US3667410A
US3667410A US31252A US3667410DA US3667410A US 3667410 A US3667410 A US 3667410A US 31252 A US31252 A US 31252A US 3667410D A US3667410D A US 3667410DA US 3667410 A US3667410 A US 3667410A
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Prior art keywords
valve
circuit
sewing
arm
piston assembly
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Expired - Lifetime
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US31252A
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English (en)
Inventor
Nereo Bianchi
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Necchi SpA
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Necchi SpA
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B69/00—Driving-gear; Control devices
    • D05B69/28—Applications of servo devices for tool-positioning purposes

Definitions

  • the present invention is a pneumatically actuated control system for sewing machines to begin and end the sewing cycle and simultaneously to place and retain the work clamp or presser foot into proper relationship with the material during the sewing cycle and comprises a first pneumatic circuit of a control valve, adjustable inlet valve and exhaust valve which circuit is mechanically linked to the sewing cycle control element in the sewing machine and a second pneumatic circuit of a first control valve, a second control valve actuated by the mechanical linkage of the first circuit, a third control valve actuated by the work clamp control element in the sewing machine, an adjustable inlet valve, and an exhaust valve which second circuit is mechanically linked to the work clamp and means to selectively actuate the control valve of the first circuit and the first control valve of the second circuit.
  • the present invention refers to a drive and control system in sewing machineswhich produces groups of stitches which includes pneumatically driven means to automatically control the beginning and ending of the sewing cycle and the lifting and lowering of the work clamp or presser foot.
  • the present invention is a pneumatic drive system which operates in a reliable manner and at the same time is simple in its design and functioning and inexpensive to construct.
  • the technical problem to be solved was that of incorporating simple and inexpensive members into the existing drive system circuit in such a way as to provide the performance and the reliability required.
  • the solution of the technical problem is achieved by providing an adjustable inlet valve and a quick exhaust valve within the pneumatic circuit which valves are connected in series with each of the we drive cylinders provided to cause the starting of the machine and the lowering and lifting of the work clamp.
  • FIG. 1 shows schematically the drive and control system in a buttonhole sewing machine in which the present invention is incorporated;
  • FIGS. 2-6 show the pneumatic circuits of the system of FIG. 1 during the different phases of the sewing cycle in which the solid black lines depict the flow of air to actuate the different elements of the machine, wherein p FIG. 2 is a schematic presentation of the invention at the end of the sewing cycle;
  • FIG. 3 is a schematic presentation of the invention just prior to the start of thesewing cyclej
  • FIG. 4 is aschematic presentation of the invention atthe start of the sewing cycle;
  • FIG. 5 is a schematic presentation of the sewing cycle
  • FIG. 6 is a schematic presentation of the invention when the sewing cycle is interrupted
  • FIG. 7 shows schematically, the exhaust valve of the invention in an open condition
  • FIG. 8 shows schematically the valve of FIG. 7 in the exhaust condition.
  • the sewing machine of the type producing groups of stitches for buttonholes is schematically shown and indicated as 10.
  • the machine comprises a bed 11, a standard 12, a horizontal arm 13 overhanging the bed 11.
  • the work table 14 is provided for mounting the machine the invention during thereon.
  • the particular pneumatic drive and control system for the machine comprises a filter 15, a pressure gauge 16 and a lubricator 17 inserted adjacent the inlet of the main feed line.
  • Two three-way valves 18 and 19 are inserted in parallel in the pneumatic circuit downstream of the lubricator 17 and are altematively actuated by a rod 20 pivoted at one end on a pin 21 and connected by link 22 to a treadle 23 pivoted about pin 24 on mounting 25.
  • the first three-way valve 18 is connected by means of conduit 26 with a needle valve 27 of the invention placed in series with the quick exhaust valve 28 of the invention which is connected with a pneumatic piston cylinder 29.
  • the operating rod 29' of the cylinder 29 is operatively connected to a bent arm lever 30 pivotally mounted about a pin 31, to act upon one arm of the multi-arm lever 32 which in turn is pivoted about pin 33.
  • the lever 32 has a second arm 32' carrying a projection 47 at its end which engages a tooth 34 of the handwheel 35 of the sewing machine as schematically shown in FIGS. 2-6.
  • a third arm 32" of said lever acts on a first two-.way valve 36 which is connected at one end by means of conduit 37 with the second three-way valve 19.
  • Valve 36 is connected at the opposite end by conduit 38 with a second two-way valve 39 which is operated by a cam 40 provided in the machine and suitably timed relative to its rotation cycle.
  • valve 39 is also connected by means of a conduit 41 to another needle valve 42 in series with another quick exhaust valve 43 which is connected with another pneumatic cylinder 44 similar to cylinder 29.
  • Cylinder 44 is operatively connected to a lever 46 pivotally mounted in the machine for lifting and lowering the work clamp 45.
  • Sewing machine drive members are shown in FIG. 2 in the position at the completion of the sewing cycle.
  • Treadle 23 is up and rod 20 acts on valve 19 keeping it open.
  • compressed air flows through conduit 37 to valve 36, which is kept open by arm 32" of the lever 32, said lever forming by its projection 47, and together with tooth 34, a lock for the machine.
  • conduit 38 which connects valve 36 with valve 39, compressed air reaches said valve 39 which is kept open by cam 40.
  • compressed air passes through needle valve 42 and quick exhaust valve 43 to cylinder 44 which moves downward and thus actuates the lifting of work clamp 45 by means of lever 46.
  • valve 19 When treadle 23 is in the intermediate @sition shown in FIG. 3, rod 20 is not in engagement with valve 19 which then closes, thus interrupting the air flow to cylinder 44. This interruption allows the pressurized air in said cylinder 44 to vent through quick exhaust valve 43 thus causing lowering of arm 46 which is connected to work clamp 45. At this point of the cycle the clamp can be lifted in order to position or to reposition the fabric to be sewn, without having to effect particular maneuvers. For this it is only necessary to release the treadle which returns, under the bias of a suitable spring (not shown in the drawings) to the position of FIG. 2. Thus valve 19 is opened again and compressed air flows to cylinder 44 operating the arm 46 raising the work clamp 45.
  • rod 20 By pressing treadle 23 further down as shown in FIG. 4, rod 20 opens valve 18 and compressed air, through conduit 26, needle valve 27 and quick exhaust valve 28, enters cylinder 29.
  • the actuation of cylinder 29 causes rotation of lever 30 about pin 31 and the consequent rotation of levers 32 about pin 33.
  • Said lever 32 because of its rotation, disengages projection 47 from tooth 34 of handwheel 35 and the machine begins its sewing cycle.
  • Lever 32 by its rotation causes the closing of valve 36 which shuts off conduit 38.
  • valve 36 will be opened by arm 32" of said lever 32 and air passes through conduit 38 to valve 39.
  • the valve is closed as described with reference to FIG. 2 and it is opened only by cam 40 at the end of every sewing cycle. Since valve 36 is closed air cannot flow into cylinder 44. In this manner the raising of work clamp 45 is prevented making it possible to resume sewing at the same point at which it has been interrupted.
  • Needle valve 27 and 42 used in the pneumatic circuit above described allow for the adjustment of the compressed air flow therethrough by use of a suitable member provided to adjust the flow port.
  • Quick exhaust valves 28 and 43 have the shape schematically shown in FIGS. 7 and 8 wherein they are shown in the open and exhaust positions respectively.
  • An inlet port 50 is provided having its diameter smaller than the diameter of the outlet ports 51, 52.
  • Outlet port 51 leads to cylinder 29 or 44.
  • sealing member 49 is urged by the compressed air against the inner end of exhaust port 52 and closes it thus directing the air into cylinder 29 or 44.
  • member 49 is biased by spring 48 against the inner end of the inlet port 50, closing it and opening exhaust port 52 to the atmosphere.
  • needle valve 27 when suitably adjusted, is used for delaying the starting of the sewing cycle which is determined by cylinder 29 in correlation with the lowering of the work clamp.
  • Safety systems as described above which are suitable to allow the predetermined sequence of the work clamp lowering and raising relative to the starting or stopping of the operating cycle, could seem useless in the cycle starting phase, if the operator would control lowering of treadle 23 to the two positions shown in FIGS. 3 and 4 and allow a certain time interval between the two movements. However, this does not take place normally, because when the operator has acquired a certain experience in the work, the operations are carried out in quick succession.
  • a first pneumatic circuit comprising a conduit leading from a source of compressed air to a first piston assembly, a plurality of levers operatively associated with said first piston assembly to selectively engage said sewing cycle control element
  • a second pneumatic circuit comprising a second piston assembly and three interconnected conduits leading from said source of compressed air to said second piston assembly, means operatively connecting said second piston assembly to said work clamp to move said clamp in response to the direction of flow of air in said second circuit, a control valve in each circuit adjacent said source of compressed air to open and close each circuit to the flow of said air to the respective piston assembly, a common means to selectively operate each of said control valves, a first valve in said second circuit interconnecting the first and second conduits and adapted to be actuated by

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US31252A 1969-04-23 1970-04-23 Drive and control system in sewing machines producing groups of stitches Expired - Lifetime US3667410A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT3241069 1969-04-23

Publications (1)

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US3667410A true US3667410A (en) 1972-06-06

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US31252A Expired - Lifetime US3667410A (en) 1969-04-23 1970-04-23 Drive and control system in sewing machines producing groups of stitches

Country Status (5)

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US (1) US3667410A (de)
BE (1) BE748893A (de)
DE (1) DE2019524A1 (de)
FR (1) FR2039370A1 (de)
GB (1) GB1282385A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3721204A (en) * 1971-11-17 1973-03-20 Teledyne Inc Automatic needle positioning and presser foot lifting mechanism
US3782313A (en) * 1971-11-24 1974-01-01 C Conti Device for synchronizing the slackening of the needle thread with the threadcutting, with timing of the slackening of the needle thread and independent control of the delay of disc opening for lockstitch sewing machines
US3788251A (en) * 1971-12-04 1974-01-29 Union Special Maschinenfab Multistage device for the control of the air supply for pneumatic aligning members
US4230056A (en) * 1978-08-15 1980-10-28 Glen Manufacturing Company Automatic thread wiper for sewing machines
US4470362A (en) * 1983-10-11 1984-09-11 Kear Jerry S Thread saver control
US4552080A (en) * 1982-04-30 1985-11-12 Mitsubishi Denki Kabushiki Kaisha Cloth cutting device in button-hole sewing machine
US6058861A (en) * 1999-07-14 2000-05-09 Sicama Sewing Machine Co., Ltd. Air control switch set for an overedge sewing machine
CN101469489B (zh) * 2007-12-28 2012-07-04 中国标准缝纫机公司上海惠工缝纫机三厂 一种缝纫机拖布轮的自动控制装置及方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8302034U1 (de) * 1983-01-26 1983-07-14 Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern, De Vorrichtung zum bearbeiten der umfangskanten von roehrenfoermigen kleidungsstuecken, z.b. roecken und kleidern

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2764112A (en) * 1954-04-26 1956-09-25 Singer Mfg Co Power operated control units for sewing machines
US3245369A (en) * 1962-10-24 1966-04-12 Durkoppwerke A G Servosystem for sewing machines
US3298341A (en) * 1964-10-05 1967-01-17 Sunstates Sportswear Inc Sewing machine control system
US3425373A (en) * 1967-10-31 1969-02-04 Robert F Miller Work piece sensor and tape cutoff for sewing machines
US3565024A (en) * 1968-06-24 1971-02-23 Richard E Tice Control system for cyclically operated stitching machines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2764112A (en) * 1954-04-26 1956-09-25 Singer Mfg Co Power operated control units for sewing machines
US3245369A (en) * 1962-10-24 1966-04-12 Durkoppwerke A G Servosystem for sewing machines
US3298341A (en) * 1964-10-05 1967-01-17 Sunstates Sportswear Inc Sewing machine control system
US3425373A (en) * 1967-10-31 1969-02-04 Robert F Miller Work piece sensor and tape cutoff for sewing machines
US3565024A (en) * 1968-06-24 1971-02-23 Richard E Tice Control system for cyclically operated stitching machines

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3721204A (en) * 1971-11-17 1973-03-20 Teledyne Inc Automatic needle positioning and presser foot lifting mechanism
US3782313A (en) * 1971-11-24 1974-01-01 C Conti Device for synchronizing the slackening of the needle thread with the threadcutting, with timing of the slackening of the needle thread and independent control of the delay of disc opening for lockstitch sewing machines
US3788251A (en) * 1971-12-04 1974-01-29 Union Special Maschinenfab Multistage device for the control of the air supply for pneumatic aligning members
US4230056A (en) * 1978-08-15 1980-10-28 Glen Manufacturing Company Automatic thread wiper for sewing machines
US4552080A (en) * 1982-04-30 1985-11-12 Mitsubishi Denki Kabushiki Kaisha Cloth cutting device in button-hole sewing machine
US4470362A (en) * 1983-10-11 1984-09-11 Kear Jerry S Thread saver control
US6058861A (en) * 1999-07-14 2000-05-09 Sicama Sewing Machine Co., Ltd. Air control switch set for an overedge sewing machine
CN101469489B (zh) * 2007-12-28 2012-07-04 中国标准缝纫机公司上海惠工缝纫机三厂 一种缝纫机拖布轮的自动控制装置及方法

Also Published As

Publication number Publication date
DE2019524A1 (de) 1970-11-12
BE748893A (fr) 1970-09-16
FR2039370A1 (de) 1971-01-15
GB1282385A (en) 1972-07-19

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