(19)
(11) EP 0 405 338 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
24.07.1991 Bulletin 1991/30

(43) Date of publication A2:
02.01.1991 Bulletin 1991/01

(21) Application number: 90111799.4

(22) Date of filing: 21.06.1990
(51) International Patent Classification (IPC)5: B24B 3/26
(84) Designated Contracting States:
AT BE CH DE DK ES FR GB GR LI LU NL SE

(30) Priority: 28.06.1989 IT 2101289

(71) Applicant: V.P.M. s.r.l.
I-46018 Sabbioneta (Mantova) (IT)

(72) Inventors:
  • Carrera, Pietro
    I-22040 Malgrate (Como) (IT)
  • Rui, Clementina
    I-22040 Malgrate (Como) (IT)

(74) Representative: Lunati, Vittoriano 
LUNATI & MAZZONI S.a.s. Via Carlo Pisacane, 36
I-20129 Milano
I-20129 Milano (IT)


(56) References cited: : 
   
       


    (54) Sharpening machine for twist drills, in particular for drilling machines


    (57) A sharpening machine for twist drills, in particular for drilling machines, including: a basement (2), a motor (4), an abrasive wheel (5) driven by the motor (4), a support and guide device (6) suitable for locating a twist drill (7) in sharpening position and for causing a shaping movement to the same twist drill, and handling means (42) suitable for obtaining the reciprocal approaching of the twist drill (7) and the abrasive wheel (5), the support and guide device (6) including a guide pin (10) engaged with the basement (2), an oscillating base (8) hinged to the guide pin (10) and supporting the positioning means (12) engaging the tang (7a) of the helical twist drill (7), and tightening means (19) including grip cheeks (20) located in proximity of the abrasive wheel (5) and rotating in reciprocal approaching for tightening the helical twist drill (7) in proximity of the cutting end thereof (7b).







    Search report