Global Patent Index - EP 1161710 A1

EP 1161710 A1 2001-12-12 - DEVICE FOR CONTROLLING THE WORKING FEED SPEED OF THE WORK UNIT OF A PROCESSING MACHINE

Title (en)

DEVICE FOR CONTROLLING THE WORKING FEED SPEED OF THE WORK UNIT OF A PROCESSING MACHINE

Title (de)

EINRICHTUNG ZUR REGELUNG DER ARBEITS- VORSCHUBGESCHWINDIGKEIT DER ARBEITSEINHEIT EINER BEARBEITUNGSMASCHINE

Title (fr)

DISPOSITIF POUR LA REGULATION DE LA VITESSE D'AVANCE DE TRAVAIL DE L'UNITE DE TRAVAIL D'UNE MACHINE D'USINAGE

Publication

EP 1161710 A1 (DE)

Application

EP 00925121 A

Priority

  • DE 19911789 A
  • EP 0002369 W

Abstract (en)

[origin: DE19911789A1] The invention relates to a device for controlling the working feed speed of the work unit of a processing machine (1) which machines a workpiece (11) by material removal. The device comprises a double-acting hydraulic cylinder (17) serving as drive element for the work unit whose feed speed is controlled by a restriction of the hydraulic oil flow which in feed mode flows through a throttle passage (49) and out of a pressure chamber (36) of the hydraulic cylinder. Said throttle passage comprises an adjustment throttle (59) which on the input side is connected to the hydraulic cylinder, as well as a pressure balance (63) which is arranged between said adjustment throttle and the reservoir (42) of the pressure-supply unit (41) and functions as a control throttle. The pressure balance comprises a balance piston (63) which on one side, on a control surface (91) having a value Aw, is subjected to the input pressure pL of the adjustment throttle (59) and can thus be displaced against the restoring force of a balance spring (86) with a view to reducing the flow section of the control throttle. The invention also provides for a control device (94, 96, 98) which as soon and for as long as the total pressure drop along the throttle passage (41) is lower than a defined threshold value pLS mediates, monotonically to the change in said pressure difference, an equivalent decrease or increase in the restoring force acting on the balance piston (63).

IPC 1-7 (main, further and additional classification)

G05B 19/43; B23Q 17/20; G05B 19/46

IPC 8 full level (invention and additional information)

B23Q 15/013 (2006.01)

CPC (invention and additional information)

B23Q 15/013 (2013.01); G05B 2219/49062 (2013.01); G05B 2219/49078 (2013.01)

Citation (search report)

See references of WO 0055701A1

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

DE 19911789 A1 20000921; EP 1161710 A1 20011212; WO 0055701 A1 20000921

INPADOC legal status


2002-12-18 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20020618

2002-03-27 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20020206

2001-12-12 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20010901

2001-12-12 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE