US3659538A - Sewing machine having contactless position control means - Google Patents

Sewing machine having contactless position control means Download PDF

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Publication number
US3659538A
US3659538A US37542A US3659538DA US3659538A US 3659538 A US3659538 A US 3659538A US 37542 A US37542 A US 37542A US 3659538D A US3659538D A US 3659538DA US 3659538 A US3659538 A US 3659538A
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United States
Prior art keywords
sewing machine
needle
control
sector
relay
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US37542A
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English (en)
Inventor
Hugo F Bosken
Alfred K Heidt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Frankl and Kirchner GmbH and Co KG
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Frankl and Kirchner GmbH and Co KG
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Application filed by Frankl and Kirchner GmbH and Co KG filed Critical Frankl and Kirchner GmbH and Co KG
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Publication of US3659538A publication Critical patent/US3659538A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B69/00—Driving-gear; Control devices
    • D05B69/22—Devices for stopping drive when sewing tools have reached a predetermined position
    • D05B69/24—Applications of devices for indicating or ascertaining sewing-tool position
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B65/00—Devices for severing the needle or lower thread
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B73/00—Casings
    • D05B73/04—Lower casings
    • D05B73/12—Slides; Needle plates

Definitions

  • Sewing machine having contactless position control means [52] U.S. Cl. ..112/219 A, 1 12/252, 250/233 operating with one or more rotating shield blades where the [5 1 It ll. Cl. ..D05b 69/22 control means for operating a thread cutter has an additional Field of Search "112/219 A, 219 220, displaced phase shield blade sector that is effective to determine the stopping of the sewing machine in relation to the position determined by the control means.
  • the invention involves as a prerequisite the use of a sewing machine which includes a position control or determining means for stopping when the needle is in a predetermined position, which has a rotating shield blade, for example a blade that has a perforation or slot.
  • a rotating shield blade for example a blade that has a perforation or slot.
  • a sewing machine of this type is arranged so that its position control means includes an additional shield blade sector for guiding or controlling a thread cutter.
  • the position control means is designed for example with a rotating slotted blade
  • the controlling shield blade sector may be in the form of an additional blade slot which may advantageously be provided in the same shield blade which controls the stopping of the sewing machine after the cutting operation while the needle is in the uppermost position.
  • the controlled part of the control means can forward the impulses produced by the passage of the effective shield blade sector in the light ray or field to an electrically operated thread cutter drive means, and operate the same at the proper point of time and/or block the same against inadmissible operation in an unsuitable position of the sewing machine needle.
  • shield blade disks When a plurality of shield blade disks are employed they may be rotatable relative to one another for accurate mutual angular positioning. They may also be arranged in amanner that the effective control sector in one of the blades may optionally be covered or shielded by another disk or blade.
  • control impulses are not directly supplied to the drive means for the thread cutter, but by way of a relay circuit by means of which the control operations are further refined and adapted to the practical requirements.
  • FIG. 2 shows an end view of the control head with the cover removed
  • FIG. 3 shows a shield blade in plan view with two slots displaced relatively to one another
  • FIG. 4 is a circuit diagram of a relay arrangement which transmits the control impulses to the drive for the thread cutter
  • FIG. 5 is the time schedule of the relay arrangement
  • FIG. 6 is a schematic illustration of the sewing machine with a front view of the thread cutter
  • FIG. 7 is a plan view of the thread cutter drawn to a somewhat larger scale.
  • the control head includes a connecting socket 1 provided with an inner shaft 2 which can be connected by means of the socket to the end of the shaft of the sewing machine.
  • the shaft is journalled in a base plate 4 whichis mounted in a ball bearing 3.
  • the shaft 2 also supports the rotating part of the control device that comprises two shield blades 5 and 6 and whose stationary parts 7, 8 and 9 are mounted on the base plate 4 or are directly carried thereby.
  • the end of the shaft 2 disposed opposite the socket 1 is provided with a thread 10 on which nuts 11, 12 and 13 are threadedly mounted which carry and clamp into position the shield blades 5 and 6.
  • the shield blades project between elements 14, 15 and 16, to be described later, of the signal receiver 17 of an optical or electrical or electronic indicating device, which when a lot in a blade passes through causes the signal receiver to transmit a setting signal to the lead 20.
  • FIG. 3 shows the shield blade 6 with two slots 18 and 19 that are angularly displaced relative to one another by about
  • the slot 18 which advances or runs ahead in the direction of rotation as indicated by arrow 21, on passing through the signal receiver effects the emission of a first signal S1 to the thread cutter, whereby the same is caused to move below the stitch plate with a specially shaped cutter.
  • a second signal S2 is emitted which is caused by the slot 19 in the blade, and thereby the cutter is pulled back and the thread is cut.
  • the slots 18 and 19 in the blade can also be seen in FIG. 2, There the slot 22 of the blade 5 which determines the low position of the needle, and which runs ahead of the slot 18 of the blade 6, is indicated in dashed lines.
  • the shield blades can be provided with inserts or sectors of material having different shielding characteristics instead of the slots l8, l9 and 22 described above.
  • the blades are arranged for angular displacement relative to one another in order to better adapt the control of the thread cutter to its special requirements, so that the control head described is usable for different thread cutting systems.
  • the circuit diagram in accordance with FIG. 4 calls for athread cutter having four magnets, illustrated by way of example in FIGS. 6 and 7, which itself is not the subject of the present application.
  • Its exciter coils are identified as ML, Ml MII and MIII, and they are operable in the periodic sequence illustrated in FIG. 5. They are controlled by means of the multi-stage relay arrangement reflected by the schedule.
  • the individual relays are identified as RS] to RS5 and their contacts as rsl to rs5,, rs5 etc.
  • the control device or position definer P is coupled with the sewing machine shaft, and Q indicates a circuit arrangement, which is not described here in detail, for controlling the sewing machine by means of an electromagnetic coupling and an electromagnetic brake that connect the machine with the continuously rotating drive motor, and where the couplingand the brake are provided with field coils MK or MB.
  • a system of this type is disclosed in US. Pat. No. 3,407,910 to Alfred Heidt, one of the present applicants.
  • the circuit in accordance with FIG. 4 in addition contains resistors R1, R2 and R3, a capacitor C, and a series connected diode D, as well as a manually operable switch in the form of a key T.
  • the time schedule in FIG. 5 shows the sequence in which the five relays RS1 to RS5 and the four field coils MI, to Mill have to be operated.
  • the lowermost part in the schedule indicates the movement of the sewing machine shaft W, which progresses in accordance with the positioning speed, and the time position of the signals S1 and S2 caused by the passage of the shield blade slots 18 and 19.
  • the machine Prior to starting the thread cutting operation the machine is located in the lower needle position. The operation is initiated by operating the key T which connects relay RS3 into the circuit. The relay holds itself by way of contact 133,. Relays RS1 and RS2 are connected by means of contact rs3 After a short pull-up time delay RS1 switches over. These delay periods are indicated in FIG. 5 by hatching.
  • the condenser C is charged by way of resistors R2 and R3. Since the position donor does not allow current to pass at 2, C discharges by way of contact rs2 position donor P, contact r32 and resistor R3.
  • the diode D at this time prevents any discharge by way of relay RS5.
  • the parallel resistor R3 is so proportioned that it does not interfere with this function.
  • relay RS5 is cut in and holds itself by way of its contact r35
  • the simultaneously closing contact m5 makes possible an action on the brake by means of the position donor.
  • the contact r35 which likewise closes connects relay RS4 with the position donor, so that it can be controlled by it.
  • the magnet Ml With contact rsS, the magnet Ml is operated which actuates the thread cutter.
  • As the second slot 19 passes through the braking is initiated by the signal across resistor R1.
  • RS4 pulls up, holding itself by its contact rs4,.
  • Contact rs4 disconnects relay RS3.
  • Contact r54 cuts in the magnet coils M1 and M11.
  • the arrangement described makes it possible to control the thread cutter by only two signals S1 and S2 from the position donor, where the signal S2 corresponds to the same top needle position in which the sewing machine is stopped.
  • the position donor therefore needs to be arranged only for emitting the intermediate signal S1. For this an additional blade sector is sufficient, thus with slotted blades only one additional slot in the same blade which already has the slot that is associated with the top position of the needle.
  • the operation of the thread cutting magnets in the required accurate sequence is effected by the multiple-stage relay circuit. Mechanical interlocking with the driving system for the needle or the looper is not necessary. Different needle cutter systems can be subsequently installed in any sewing machine and controlled by position donors that require only small changes.
  • the manual switch or key controls a pre-relay RS3, at whose operating contact m3, the coils of relays RS1 and RS2 are connected which respond in time sequence, which in steps, partly directly and partly by way of further relays RS4 and RS5, effect directly the connecting of the magnet coils MI to M11].
  • the operating contacts of the further pre-relaysthese and RS5 are connected ahead of these magnet coils, which in turn are in communication with the receiving system 17 of the position donor and are caused to respond by its output signals S1 and S2.
  • the relays RS1 and RS2 which control the thread cutter include additional contacts rsl and rs2 for controlling the brake or its coil MB that stops the sewing machine.
  • At least one of the pre-relays, RS5 in this case, is connected to a condenser C which is discharged through the control means as the aforementioned intermediate signal S1 is released by way of the field coil of the pre-relay and causes it to respond.
  • the circuit can be adapted to different thread cutting systems while retaining the foregoing features.
  • the arrangement of the shield blades can be varied by adding additional blades. If, for example, a cover blade having its own slot is arranged parallel to the slotted blade and turnable relative thereto, then the slot of the first blade can optionally be covered completely or partially, and its effectiveness can be changed or made ineffective.
  • a brushless synchronizer including a control head comprising a control shaft portion at the other end of said drive shaft, shielding means including at least one shield blade mounted on said shaft portion and having a control sector effective to stop the sewing machine in a predetermined upper positionof the needle, control circuit means having an operating part disposed proximate said shielding means, and having a part controlling the operation of said coupling and said brake and a cutter control part for operating said cutter, said shielding means including an additional control sector in said one shield blade arranged in phase displaced relationship with said control sector effective to operate said cutter control part, a
  • Sewing machine in accordance with claim 2 including a signal receiving system having circuit elements proximate and shielded by said shield blades and comprising aplurality of relays operatively connected to said circuit elements and having relay contacts, electromagnetic means for operating said thread cutter including a plurality of magnet coils connected to said relay contacts.
  • Sewing machine in accordance with claim 3, comprising a pre-relay and a manual switch for initiating the thread cutting operation, said pre-relay having a working contact, a plurality of sequentially operated relays having coils operatively connected to said working contact and operative to energize said magnet coils of said thread cutter.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US37542A 1969-05-17 1970-05-15 Sewing machine having contactless position control means Expired - Lifetime US3659538A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1925301A DE1925301C3 (de) 1969-05-17 1969-05-17 Nähmaschine mit Fadenabschneider

Publications (1)

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US3659538A true US3659538A (en) 1972-05-02

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US37542A Expired - Lifetime US3659538A (en) 1969-05-17 1970-05-15 Sewing machine having contactless position control means

Country Status (10)

Country Link
US (1) US3659538A (de)
AT (1) AT313690B (de)
BE (1) BE750285A (de)
CH (1) CH511314A (de)
DE (1) DE1925301C3 (de)
DK (1) DK137247B (de)
FR (1) FR2047667A5 (de)
GB (1) GB1311755A (de)
NL (1) NL7006883A (de)
NO (1) NO128718B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3788250A (en) * 1970-06-19 1974-01-29 Yamamoto Electric Ind Co Ltd System for stopping sewing machine needle at predetermined position
US3990374A (en) * 1975-03-28 1976-11-09 Frankl & Kirchner Contactless synchronizer for sewing machines
WO1984002933A1 (fr) * 1983-01-24 1984-08-02 Inst Cercetari Stiintifice Dispositif de commande electronique pour systemes d'entrainement avec accouplements electromagnetiques pour machines industrielles a coudre et/ou de surjet

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3133333C2 (de) * 1981-08-22 1986-08-14 Aktiengesellschaft Adolph Saurer, Arbon Schiffchenstickmaschine
DE3600938C1 (de) * 1986-01-15 1987-08-06 Pfaff Haushaltmasch Impulsgeber fuer einen Naehmaschinenantrieb
JPH0229286A (ja) * 1988-07-19 1990-01-31 Mitsubishi Electric Corp ミシンの制御装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU193295A1 (ru) * В. А. Уйманов , Л. А. Дивинский Электрическое управляющее устройство для привода швейной машины
US3157261A (en) * 1961-02-10 1964-11-17 Necchi Spa Programmed start and stop for a machine such as a sewing machine
US3204592A (en) * 1961-11-20 1965-09-07 Jong Wilhelmus Maria De Sewing machine with needle position control means
US3477399A (en) * 1969-02-19 1969-11-11 Quick Rotan Becker & Co Switching device for a sewing machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU193295A1 (ru) * В. А. Уйманов , Л. А. Дивинский Электрическое управляющее устройство для привода швейной машины
US3157261A (en) * 1961-02-10 1964-11-17 Necchi Spa Programmed start and stop for a machine such as a sewing machine
US3204592A (en) * 1961-11-20 1965-09-07 Jong Wilhelmus Maria De Sewing machine with needle position control means
US3477399A (en) * 1969-02-19 1969-11-11 Quick Rotan Becker & Co Switching device for a sewing machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3788250A (en) * 1970-06-19 1974-01-29 Yamamoto Electric Ind Co Ltd System for stopping sewing machine needle at predetermined position
US3990374A (en) * 1975-03-28 1976-11-09 Frankl & Kirchner Contactless synchronizer for sewing machines
WO1984002933A1 (fr) * 1983-01-24 1984-08-02 Inst Cercetari Stiintifice Dispositif de commande electronique pour systemes d'entrainement avec accouplements electromagnetiques pour machines industrielles a coudre et/ou de surjet

Also Published As

Publication number Publication date
DE1925301A1 (de) 1970-11-19
DE1925301C3 (de) 1976-01-02
GB1311755A (en) 1973-03-28
DE1925301B2 (de) 1975-05-22
NO128718B (de) 1974-01-02
DK137247B (da) 1978-02-06
CH511314A (de) 1971-08-15
FR2047667A5 (de) 1971-03-12
BE750285A (fr) 1970-10-16
AT313690B (de) 1974-02-25
DK137247C (de) 1978-07-10
NL7006883A (de) 1970-11-19

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