Apparatus for operating the clamping jaws of a chuck

In an apparatus for operating the clamping jaws of a chuck that is part of a machining tool, with said clamping jaws being radially displaceably guided in a driven chuck body, which for that purpose is secured to the main spindle of said machining tool, said clamping jaws being coupled with a rotatable or axially displaceably adjustment member via intermediate means, and said adjustment member being in driving connection with an adjusting drive mechanism for producing an adjustment movement, the improvement wherein:

• said adjusting drive mechanism is formed exclusively by a two-part rotary motor that is disposed externally of said main spindle and parallel thereto, with said rotary motor being rotatably mounted as a self-contained unit, and having a first functional member and a second functional member, with said first functional member being driveable by said main spindle and being drivingly supported on the latter, and with said second functional member being drivingly connected with said adjustment member;
• said two functional members of said rotary motor can, via the latter, be positively secured to one another to maintain a clamping force, and be infinitely variably moved relative to one another to effect an adjustment movement;
• said first functional member of said rotary motor being drivingly connected with, and supported on, said main spindle via first transmission means;
• said second functional member of said rotary motor being drivingly connected with said adjustment member via second transmission means;
• said first transmission means including a first pulley that is fixedly disposed on said first functional member, a second pulley that is fixedly disposed on said main spindle, and a toothed belt that meshes with said first and second pulleys;
• said second transmission means
• including a third pulley that is fixedly disposed on said second functional member, a fourth pulley that is fixedly disposed on said adjustment member, and a toothed belt that meshes with said third and fourth pulleys.

In an apparatus for operating the clamping jaws of a chuck that is part of a machining tool, with said clamping jaws being radially displaceably guided in a driven chuck body, which for that purpose is secured to the main spindle of said machining tool, said clamping jaws being coupled with a rotatable or axially displaceable adjustment member via intermediate means, and said adjustment member being in driving connection with an adjusting drive mechanism for producing an adjustment movement, the improvement wherein:

• said adjusting drive mechanism is formed exclusively by a two-part rotary motor that is disposed externally of said main spindle and parallel thereto, with said rotary motor being rotatably mounted as a self-contained unit, and having a first functional member and a second functional member, with said first functional member being driveable by said main spindle and being drivingly supported on the latter, and with said second functional member being drivingly connected with said adjustment member;
• said two functional members of said rotary motor can, via the latter, be positively secured to one another to maintain a clamping force, and be infinitely variably moved relative to one another to effect an adjustment movement;
• said apparatus to convert a relative rotation of said second functional member of said rotary motor relative to said first functional member thereof, including a hydraulic system that is in the form of a liquid column and acts upon a piston, which is connected to said adjustment member and can be acted upon on opposite sides;
• and in which includes a pump for displacing said liquid column, said pump being operable as a function of the relative rotation of said two functional members of said rotary motor.

In an apparatus for operating the clamping jaws of a chuck that is part of a machining tool, with said clamping jaws being radially displaceably guided in a driven chuck body, which for that purpose is secured to the main spindle of said machining tool, said clamping jaws being coupled with a rotatable or axially displaceable adjustment member via intermediate means, and said adjustment member being in driving connection with an adjusting drive mechanism for producing an adjustment movement, the improvement wherein:

• said adjusting drive mechanism is formed exclusively by a two-part rotary motor that is disposed externally of said main spindle and parallel thereto, with said rotary motor being rotatably mounted as a self-contained unit, and having a first functional member and a second functional member, with said first functional member being driveable by said main spindle and being drivingly supported on the latter, and with said second functional member being drivingly connected with said adjustment member;
• said two functional members of said rotary motor can, via the latter, be positively secured to one another to maintain a clamping force, and be infinitely variably moved relative to one another to effect an adjustment movement;
• said machining tool including a housing, with said rotary motor being disposed directly in said housing, and with said functional members, which are adjustable relative to one another, being in driving connection with said main spindle and said adjustment member via transmission means;
• said adjustment member being nonrotatably and axially displaceably connected to said main spindle;
• and a sleeve that is rotatably disposed on said main spindle and is coupled with said adjustment member via a screw drive;
• said second functional member of said rotary motor being in driving connection with said main spindle, while said rotatably mounted first functional member is in driving connection with said sleeve.

In an apparatus for operating the clamping jaws of a chuck that is part of a machining tool, with said clamping jaws being radially displaceably guided in a driven chuck body, which for that purpose is secured to the main spindle of said machining tool, said clamping jaws being coupled with a rotatable or axially displaceable adjustment member via intermediate means, and said adjustment member being in driving connection with an adjusting drive mechanism for producing an adjustment movement, the improvement wherein:

• said adjusting drive mechanism is formed exclusively by a two-part rotary motor that is disposed externally of said main spindle and parallel thereto, with said rotary motor being rotatably mounted as a self-contained unit, and having a first functional member and a second functional member, with said first functional member being driveable by said main spindle and being drivingly supported on the latter, and with said second functional member being drivingly connected with said adjustment member;
• said two functional members of said rotary motor can, via the latter, be positively secured to one another to maintain a clamping force, and be infinitely variably moved relative to one another to effect an adjustment movement;
• said first functional member of said rotary motor being in driving connection with said chuck body, while said second functional member is in driving connection with said adjustment member, which is disposed in said chuck, said chuck body being provided with tooth means by means of which, via a toothed belt, said chuck body is in driving connection with said first functional member of said rotary motor.