US3683294A - Contactless synchronizer, particularly for sewing machines - Google Patents

Contactless synchronizer, particularly for sewing machines Download PDF

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Publication number
US3683294A
US3683294A US11099A US3683294DA US3683294A US 3683294 A US3683294 A US 3683294A US 11099 A US11099 A US 11099A US 3683294D A US3683294D A US 3683294DA US 3683294 A US3683294 A US 3683294A
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United States
Prior art keywords
synchronizer
indicators
accordance
magnetic
coils
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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
US11099A
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English (en)
Inventor
Hans Gaa
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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    • 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

Definitions

  • ABSTRACT [52] CL -331/65v 112/219 A, 250/220 R, Synchronizer without contacts, particularly for sewing 250/233, 318/467, 331/66, 331/117 R, machines, utilizes a unitary assembly of rotating posi- 331/172, 340/271 340/282 tion indicators for reducing flux changes in a common [51] Int. Cl. ..D05b 69/00, H03b 5/12 field and a transistorized oscillating circuit for com [58] Field of Search ..112/219 A; 331/65, 66,172,
  • Position setters are intended to initiate certain control operations such as stopping of the machine, actuation of a thread cutter or of a presser foot on reaching or passing through predetermined operating positions of the controlled machine.
  • Position indicators include position indicators coupled with the moving part of the machine, which in the position for which they are set automatically initiate the desired control operation.
  • Synchronizers operating with electrical contactors may include several contact cam disks intended for different control operations; synchronizers operating without contacts, on the other hand, require sources of rays such as light sources or magnetic field sources, for example permanent magnets or electromagnetic coils, that are provided in the vicinity of the rotating position indicator and which therefore must be installed directly in the synchronizing device.
  • sources of rays such as light sources or magnetic field sources, for example permanent magnets or electromagnetic coils, that are provided in the vicinity of the rotating position indicator and which therefore must be installed directly in the synchronizing device.
  • sources of rays such as light sources or magnetic field sources, for example permanent magnets or electromagnetic coils
  • the invention is intended to eliminate the problems of the prior art. It is particularly concerned with a contactless synchronizer particularly for sewing machines having several rotating position indicators for different control operations, and it is characterized in that a common field or radiating source is provided for several control operations in the range of which at least two position indicators that act on the field are rotating as a unit.
  • position indicators may be perforated shield disks known per se which are coupled with the machine that is being surveyed and which, depending on their position, interrupt or release the field or the ray.
  • receivers At the side remote from the source there are located receivers that respond to changes of the field or of the radiation, which emit corresponding impulses to the control devices which cause or initiate the desired control functions.
  • a common light source is disposed between at least two rotating slotted shields or a magnetic coil between at least two magnetic shields which, depending on their position, alternately shield and open the light source or the magnetic field and thereby effect different control operations.
  • the action of the control means to be influenced may, moreover, be the same as in a contact making or contact breaking action.
  • the invention makes it possible to utilize one and the same source of rays or field source for several control operations whereby different sectors of the field of rays or of the magnetic field can be acted on by the position indicators cooperating with the same source.
  • a magnetic coil is arranged between at least two magnetic shields.
  • this magnetic coil is a component of a feedback coupled transistor oscillating circuit, and magnetic shields with passage areas that are displaced with respect to one another rotate in the magnetic field of the feedback coil.
  • FIG. 1 shows the synchronizing device in a longitudinal section
  • FIG. 2 shows another section similar to FIG. 1 to an enlarged scale, illustrating particularly the circuit components
  • FIG. 3 is a bottom view of the components illustrated in FIG. 2,
  • FIG. 4 is a circuit diagram of the feedback oscillating transistor circuit
  • FIG. 5 shows a synchronizer in accordance with FIG.
  • the synchronizer is in the form of a structural unit enclosed in a removable housing 1 adapted to be coupled to the end of the arm shaft of a sewing machine. It includes a base plate 2 in which a shaft 3 is journalled in the ball bearing 6. This shaft carries at one end a connecting socket 3a that can be connected to the end of the arm shaft of the sewing machine.
  • the shaft 3 has secured thereto shield disks 4 and 5 which serve as position indicators and rotate with the shaft and which are suitably angularly adjustable.
  • the stationary part of the synchronizer is supported by a frame 7 that can be seated on the base plate 2 and which upon mounting of the circuit components may be filled with a resinous substance.
  • the components are protected by the resin filling 8 and held in their respective positions.
  • the synchronizer frame 7 in accordance with FIG. 5 has a common light source 9 disposed between the rotating slotted disks 4 and 5.
  • the rays emitted by the light source 9 are bunched in the lenses 12, 13 and are received by photocells 10, 11 as determined by the movement of shields 4, 5.
  • the feedback transistor circuit in accordance with FIG. 4 comprises three magnet coils L1, L2 and L3, between which project the shield disks 4 and 5.
  • These shield disks which are provided with radial slots constitute magnetic shields which upon rotation establish and interrupt the passage of magnetic flux therethrough, or which in other words interrupt or open the magnetic fields that extend between the coils L1 and L3, respectively L2 and L3, depending on whether the closed portions of the disks or the slots provided therein are at the time disposed between the coils.
  • the circuit in accordance with FIG. 4 includes, besides the back coupled transistor T and the coils L1, L2 and L3, five ohmic resistors R2, R3, R36, R37, R39, two adjustable temperature responsive resistors or hot conductors R1 and R38 serving for temperature compensation, as well as three capacitors C8, C9 and C11.
  • the resistor R36 and the combination of the resistors R37, R38 and R39 form together a potential divider at the juncture point of which the base of the transistor T15 is connected.
  • the emitter-base potential of the transistor is adjusted by means of the potential divider to its bias value.
  • the resonance frequency of the oscillating circuit is determined by the inductance and'the capacitance of the oscillating circuit defined by the coil L3 and the condenser C9.
  • the condenser C8 serves for bridging the high frequency of the resistor network R37, R38, R39.
  • This circuit branch contains the resistors R1, R2.
  • the capacitor C11 forms a supplemental feedback coupling.
  • the oscillator circuit is connected by means of the terminal A3 to the negative pole and, depending on the control operation to which it is adjusted, either with the terminal Al or A2 by means of a switch sw to the positive pole of a direct current source B of, for example, 7 volts.
  • a resistor R40 of, for example, 1,000 ohms at which the initial signal is picked up. This is then fed, if need be upon further amplification, to the control devices of the sewing machine that are to be operated.
  • the oscillating circuit operates as follows:
  • coil L1 is in circuit by way of the terminal A1.
  • the closed part of the shielding disk 4 is between the coils L1 and L3, there exists no feedback.
  • the transistor T15 carries a small collector current determined by the emitter-base potential. If the slot of the shield disk 4 passes between the coils L1 and L3, there develops a rectified altemating current between the emitter and the baseas a result of the feedback arising between them. As a con-' sequence the bias of the base and thereby the-collector current increases.
  • a synchronizer having two rotatable position indicators for different control functions, the combination of an rotary shaft supporting said indicators coaxi ally in laterally spaced and rotatably adjustable relation to each other, energy flux producing means fixedly positioned at the axially outer sides, respectively of said position indicators, said indicators being operable upon rotation thereof to control passage of said energy flux therethrough, sensing means fixedly positioned intermediate, said indicators and responsive to said passage of said energy flux through said indicators; and an electrical circuit controlled by said sensing means to produce signal outputs in response to rotation of said position indicators, said energy flux producing means being magnetic coils and said position indicators being magnetic shield disks having radial slots, respectively, for the passage of magnetic flux from said coils through said disks to said sensing means.
  • Synchronizer in accordance with claim 5 including a capacitive circuit branch serving as a high frequency bridge for a plurality of potential dividers and including a second hot conductor for temperature compensation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US11099A 1969-02-18 1970-02-13 Contactless synchronizer, particularly for sewing machines Expired - Lifetime US3683294A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1907975A DE1907975C3 (de) 1969-02-18 1969-02-18 Kontaktfrei arbeitender Synchronisator

Publications (1)

Publication Number Publication Date
US3683294A true US3683294A (en) 1972-08-08

Family

ID=5725541

Family Applications (1)

Application Number Title Priority Date Filing Date
US11099A Expired - Lifetime US3683294A (en) 1969-02-18 1970-02-13 Contactless synchronizer, particularly for sewing machines

Country Status (11)

Country Link
US (1) US3683294A (de)
AT (1) AT313689B (de)
BE (1) BE737363A (de)
CH (1) CH493677A (de)
DE (1) DE1907975C3 (de)
DK (1) DK135731B (de)
FR (1) FR2031484A1 (de)
GB (1) GB1273772A (de)
NL (1) NL163646C (de)
NO (1) NO128409B (de)
SE (1) SE346344B (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3738297A (en) * 1971-06-21 1973-06-12 Elettromeccania Sas Mazzini Mo Electronic control arrangement for the needle and threadcutter in an industrial sewing machine
US3805185A (en) * 1972-07-05 1974-04-16 Stanley Electric Co Ltd Switching oscillator controlled by a moving metal piece
US3989943A (en) * 1975-07-03 1976-11-02 Campbell John E Angularly adjustable optical switch assembly
US4002128A (en) * 1974-08-12 1977-01-11 Union Special Corporation Automatic sewing machine
US4287762A (en) * 1979-08-06 1981-09-08 Rainwise, Inc. Digital weather station
US4463698A (en) * 1980-12-19 1984-08-07 Matsushita Electric Industrial Co., Ltd. Needle position detector
US4584954A (en) * 1981-07-10 1986-04-29 Mitsubishi Denki Kabushiki Kaisha Detector for use on sewing machines
US4751888A (en) * 1986-01-15 1988-06-21 Pfaff Haushaltmaschinen Gmbh Pulse generator for a sewing machine drive
US4987842A (en) * 1981-07-10 1991-01-29 Mitsubishi Denki Kabushiki Kaisha Detector for use on sewing machine
US5540161A (en) * 1995-08-29 1996-07-30 Quick Technologies, Inc. Sewing apparatus having a sandwich synchronizer

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4052946A (en) * 1976-03-26 1977-10-11 The Singer Company Electronic control package for sewing machine
DE2837743C3 (de) * 1978-08-30 1982-02-04 Frankl & Kirchner GmbH & Co KG Fabrik für Elektromotoren u.elektrische Apparate, 6830 Schwetzingen Opto-elektronischer Positionsgeber
FR2462920A1 (fr) * 1979-08-07 1981-02-20 Nyman Alice Dispositif generateur de son synchronise a un modele reduit de locomotive

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2154287A (en) * 1935-06-20 1939-04-11 Westinghouse Electric & Mfg Co Electrical control system
US3128387A (en) * 1959-09-22 1964-04-07 Harold K Hughes Photosensitive low-torque transducer
GB1047560A (en) * 1965-03-08 1966-11-09 Altenburg Naehmasch Veb Improvements in or relating to control devices for sewing machine drives
US3311824A (en) * 1963-09-06 1967-03-28 Duncan Electric Co Inc Transient insensitive photoelectric impulse device for use with watthour meter to actuate demand recorder
US3502955A (en) * 1966-11-03 1970-03-24 Brunswick Corp Pulse forming circuit and capacitor discharge ignition systems therewith

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2154287A (en) * 1935-06-20 1939-04-11 Westinghouse Electric & Mfg Co Electrical control system
US3128387A (en) * 1959-09-22 1964-04-07 Harold K Hughes Photosensitive low-torque transducer
US3311824A (en) * 1963-09-06 1967-03-28 Duncan Electric Co Inc Transient insensitive photoelectric impulse device for use with watthour meter to actuate demand recorder
GB1047560A (en) * 1965-03-08 1966-11-09 Altenburg Naehmasch Veb Improvements in or relating to control devices for sewing machine drives
US3502955A (en) * 1966-11-03 1970-03-24 Brunswick Corp Pulse forming circuit and capacitor discharge ignition systems therewith

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3738297A (en) * 1971-06-21 1973-06-12 Elettromeccania Sas Mazzini Mo Electronic control arrangement for the needle and threadcutter in an industrial sewing machine
US3805185A (en) * 1972-07-05 1974-04-16 Stanley Electric Co Ltd Switching oscillator controlled by a moving metal piece
US4002128A (en) * 1974-08-12 1977-01-11 Union Special Corporation Automatic sewing machine
US3989943A (en) * 1975-07-03 1976-11-02 Campbell John E Angularly adjustable optical switch assembly
US4287762A (en) * 1979-08-06 1981-09-08 Rainwise, Inc. Digital weather station
US4463698A (en) * 1980-12-19 1984-08-07 Matsushita Electric Industrial Co., Ltd. Needle position detector
US4584954A (en) * 1981-07-10 1986-04-29 Mitsubishi Denki Kabushiki Kaisha Detector for use on sewing machines
US4920905A (en) * 1981-07-10 1990-05-01 Mitsubishi Denki Kabushiki Kaisha Detector for use on sewing machines
US4987842A (en) * 1981-07-10 1991-01-29 Mitsubishi Denki Kabushiki Kaisha Detector for use on sewing machine
US4751888A (en) * 1986-01-15 1988-06-21 Pfaff Haushaltmaschinen Gmbh Pulse generator for a sewing machine drive
US5540161A (en) * 1995-08-29 1996-07-30 Quick Technologies, Inc. Sewing apparatus having a sandwich synchronizer

Also Published As

Publication number Publication date
DE1907975C3 (de) 1975-03-27
DK135731C (de) 1977-11-14
NL163646B (nl) 1980-04-15
BE737363A (de) 1970-01-16
DE1907975A1 (de) 1970-09-03
DK135731B (da) 1977-06-13
NL163646C (nl) 1980-09-15
GB1273772A (en) 1972-05-10
DE1907975B2 (de) 1974-07-25
FR2031484A1 (de) 1970-11-20
SE346344B (de) 1972-07-03
CH493677A (de) 1970-07-15
NO128409B (de) 1973-11-12
NL6906819A (de) 1970-08-20
AT313689B (de) 1974-02-25

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KR20000015922A (ko) 최소한 하나의 방적사 센서를 갖는 방적사 공급기