(19)
(11) EP 1 867 767 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
27.05.2009 Bulletin 2009/22

(43) Date of publication A2:
19.12.2007 Bulletin 2007/51

(21) Application number: 07008337.3

(22) Date of filing: 24.04.2007
(51) International Patent Classification (IPC): 
D03D 51/02(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK RS

(30) Priority: 13.06.2006 JP 2006163242

(71) Applicant: TSUDAKOMA KOGYO KABUSHIKI KAISHA
Kanazawa-shi, Ishikawa-ken 921-8650 (JP)

(72) Inventors:
  • Yamamoto, Akihiro
    Kanazawa-shi Ishikawa-ken, 921-8650 (JP)
  • Yamazaki, Morikazu
    Kanazawa-shi Ishikawa-ken, 921-8650 (JP)
  • Ishita, Tomokazu
    Kanazawa-shi Ishikawa-ken, 921-8650 (JP)
  • Yama, Kazufumi
    Kanazawa-shi Ishikawa-ken, 921-8650 (JP)
  • Matsumoto, Masato
    Kanazawa-shi Ishikawa-ken, 921-8650 (JP)

(74) Representative: Fritsche, Rainer 
Eisenführ, Speiser & Partner Postfach 31 02 60
80102 München
80102 München (DE)

   


(54) Driving apparatus for loom


(57) A driving apparatus (30, 50) for a loom (10) includes a main shaft (14) that transmits a rotational force to devices included in the loom (10), an alternating-current motor (16), a speed-reducing mechanism for transmitting rotation of the motor (16) to the main shaft (14) while reducing a rotational speed of the motor (16) at a predetermined ratio, an electromagnetic brake (24) that applies a braking torque to the main shaft (14) when an excitation current is supplied thereto, a drive circuit (34) that supplies alternating-current power to the motor (16), and a brake circuit (36) that supplies the excitation current to the electromagnetic brake (24). When the loom (10) stops, the drive circuit (34) outputs an alternating-current voltage at a frequency corresponding to a synchronous speed lower than the actual rotational speed of the motor (16), so that the motor (16) generates a braking torque in a direction opposite to the rotating direction. In addition, the brake circuit (36) outputs the excitation current to stop the main shaft (14).







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