EP0179742A1 - Steuer- und Abstellvorrichtung für automatische Nähmaschinen, besonders Mehrnadelstrickmaschinen - Google Patents

Steuer- und Abstellvorrichtung für automatische Nähmaschinen, besonders Mehrnadelstrickmaschinen Download PDF

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Publication number
EP0179742A1
EP0179742A1 EP85830159A EP85830159A EP0179742A1 EP 0179742 A1 EP0179742 A1 EP 0179742A1 EP 85830159 A EP85830159 A EP 85830159A EP 85830159 A EP85830159 A EP 85830159A EP 0179742 A1 EP0179742 A1 EP 0179742A1
Authority
EP
European Patent Office
Prior art keywords
thread
control
stopping
disc
pulley
Prior art date
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.)
Withdrawn
Application number
EP85830159A
Other languages
English (en)
French (fr)
Inventor
Giannino Landoni
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.)
Meca Sas Di Cagnoni Landoni & C
Original Assignee
Meca Sas Di Cagnoni Landoni & C
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Meca Sas Di Cagnoni Landoni & C filed Critical Meca Sas Di Cagnoni Landoni & C
Publication of EP0179742A1 publication Critical patent/EP0179742A1/de
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B51/00—Applications of needle-thread guards; Thread-break detectors
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05C—EMBROIDERING; TUFTING
    • D05C11/00—Devices for guiding, feeding, handling, or treating the threads in embroidering machines; Machine needles; Operating or control mechanisms therefor
    • D05C11/08—Thread-tensioning arrangements
    • D05C11/14—Stop motions responsive to thread tension or breakage

Definitions

  • the present invention relates to a device for the control and stopping of automatic sewing machines, prefe rably but not exclusively of automatic multi-needle embroidering machines.
  • the purpose of this invention is to provide a device for the control and stopping of sewing machines, in particular automatic embroidering machines and apt to command stopping of the machines not only as a result of breakage of the needles thread, but also in case of breakage or depletion of the lower crochet or shuttle thread, skipping of stitches or irregular tension applied on the yarn.
  • the invention consists of a device for the control and stopping of automatic sewing machines, characterized in that it comprises:
  • the thread under control identified as 1 is unwound from a reel S and, after having crossed guide bar 8 and device 10 according to the invention, is led to the sewing zone where it engages, in the fabric, with the other thread 6.
  • the arrangement of only one thread is shown, but as it can be seen from Fig. 1, the machine is provided with a plurality of devices 10, each associated with the corresponding thread which unwinds from the different reels.
  • the device of the invention illustrated in more detail in Figs. 2 and 3, comprises a housing formed by two halves 11 and 12.
  • a shaft 18 crosses the two halves and is free to rotate, if necessary, under the control of friction means.
  • Shaft 18 is provided with a pulley 15 located outside the housing and with a disc 20, located inside the housing.
  • Half 12 is moreover provided with a sensor 24, connected to an electronic processing circuit 26.
  • Disc 20 is provided, peripherally, with a plurality of reference elements 21, the passage of which, through the angular position (corresponding to that of the sensor) can be detected by the sensor.
  • the reference elements consist of equally spaced notches or slots and the sensor is an optic coupler apt to generate an electric pulse each time a slot is passing.
  • a set of magnets in conjunction with a hall type detector may be used, provided the combination is apt to generate a succession of pulses representing the rotating speed of the disc.
  • thread 1 is wound on the pulley, forming one or two complete turns around it, before going on toward the sewing zone.
  • the rotating speed of the pulley (hence of the disc) is proportional to the consum ption of the thread.
  • Said value in addition to being dependent on the type of stitch applied, is also variable in a given interval which defines two acceptable operating limit conditions.
  • An electronic control circuit processes the pulse signals issued by sensor 24 and compares them with preset limits. More specifically, the pulses can be memorized periodically in a counter and successively converted to a direct voltage of proportional value by means of a digital-analogue converter.
  • the pulses can be integrated in a preset time interval or processed in other known ways to obtain a voltage (or a current) proportional to the rotating speed of the disc. This voltage is then compared by applying it to the reference inputs polarized with voltages proportional to the preset limit values. A digital type logic will then determine if the value of the detected voltage is compris ed within the limits or not. If not, a signal is generated which, suitably amplified, controls stopping of the machine.
  • Control circuit 26 is shown schematically in Fig. 2 as a wired circuit with discrete components and, in this case, the setting of the limit values is effected by adjusting two components (for example, two potentiometers) on two graduated scales.
  • the control circuit comprises a programmable microprocessor 27, serving all the control devices 10, the operation of which is much more flexible, as any modification of the limit values can be entered directly from a keyboard or by the same program governing operation of the entire machine.
  • disc 20 is keyed directly on shaft 18 of the pulley and reference elements 21 are set at equal distances from each other so that a linear proportionality exists between the speed (or consum ption rate) of the thread and the electric signal to be compared.
  • This ration of proportionality can however be varied by providing step-up gears between the pulley and the disc and/or providing a different distribution of the reference elements so as to obtain an improved sensiti vity of the device in the regular operating zone.
  • Another alternative is to operate a non linear digital-analogue conversion, again for the purpose of expanding the interval of the values measured during a regular operation. It is understood that these and other changes and modifications,which are within the reach of the average technician of the sector, are included in the protective scope of this invention.
  • thc invention is not limited to said embodiment, but also extends to other embodiments contemplating control of thread consumption (controlled thread) to verify the operating regularity of a sewing machine and to control stopping of same when thread consumption deviates from a preset and selectable interval.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
EP85830159A 1984-10-19 1985-06-25 Steuer- und Abstellvorrichtung für automatische Nähmaschinen, besonders Mehrnadelstrickmaschinen Withdrawn EP0179742A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2324084 1984-10-19
IT23240/84A IT1175873B (it) 1984-10-19 1984-10-19 Dispositivo per il controllo e l'arresto di una macchina cucitrice automatica, particolarmente una macchina trapuntatrice multiaghi

Publications (1)

Publication Number Publication Date
EP0179742A1 true EP0179742A1 (de) 1986-04-30

Family

ID=11205231

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85830159A Withdrawn EP0179742A1 (de) 1984-10-19 1985-06-25 Steuer- und Abstellvorrichtung für automatische Nähmaschinen, besonders Mehrnadelstrickmaschinen

Country Status (2)

Country Link
EP (1) EP0179742A1 (de)
IT (1) IT1175873B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2618167A1 (fr) * 1987-07-14 1989-01-20 Tokai Ind Sewing Machine Machine a broder.
EP1208483A1 (de) * 1999-04-06 2002-05-29 Laurence P. Rubel System für die kontrolle und die defektsvoraussage für textilverarbeitungsmaschinen
CN101624761B (zh) * 2009-08-07 2011-12-07 浙江青本缝纫机有限公司 多针缝纫机中的橡筋线输送装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2041627A5 (en) * 1969-05-08 1971-01-29 Wittenberge Naehmasch Veb Sewing machine thread breakage detector
US3843883A (en) * 1973-03-08 1974-10-22 Usm Corp Thread use monitor
US4196685A (en) * 1977-07-25 1980-04-08 Aisin Seiki Kabushiki Kaisha Thread abnormality detection utilizing integrator and comparator in conjunction with rotary thread tension disk

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2041627A5 (en) * 1969-05-08 1971-01-29 Wittenberge Naehmasch Veb Sewing machine thread breakage detector
US3843883A (en) * 1973-03-08 1974-10-22 Usm Corp Thread use monitor
US4196685A (en) * 1977-07-25 1980-04-08 Aisin Seiki Kabushiki Kaisha Thread abnormality detection utilizing integrator and comparator in conjunction with rotary thread tension disk

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2618167A1 (fr) * 1987-07-14 1989-01-20 Tokai Ind Sewing Machine Machine a broder.
EP1208483A1 (de) * 1999-04-06 2002-05-29 Laurence P. Rubel System für die kontrolle und die defektsvoraussage für textilverarbeitungsmaschinen
EP1208483A4 (de) * 1999-04-06 2006-11-02 Laurence P Rubel System für die kontrolle und die defektsvoraussage für textilverarbeitungsmaschinen
CN101624761B (zh) * 2009-08-07 2011-12-07 浙江青本缝纫机有限公司 多针缝纫机中的橡筋线输送装置

Also Published As

Publication number Publication date
IT8423240A0 (it) 1984-10-19
IT1175873B (it) 1987-07-15
IT8423240A1 (it) 1986-04-19

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Inventor name: LANDONI, GIANNINO