Machine tool

In a turret drill machine having a driving spindle, a turret wheel for holding a plurality of tool carriers and for displacing a selected tool carrier into an operational position in alignment with said driving spindle, means for coupling said driving spindle to the selected tool carrier and means for displacing said tool carrier in a feeding direction, a combination comprising a direct current motor for driving said driving spindle, said motor having a relatively stable torque in a wide range of rotational speeds, programmable means for electrically controlling the rotational speed of said motor and the feeding movement of said tool carrier according to a predetermined program prepared for machining a particular workpiece, a plurality of drill spindles each including tool carrier and transmission gears arranged between said tool carrier and said coupling means, the transmission ratio in at least one group of said drill spindles being the same, and wherein one group of drill spindles in said machine has transmission gears with a first transmission ratio and another group of spindles has gear with a different transmission ratio.

In a machine tool having a driving spindle, a turret wheel for holding a plurality of tool carriers and for displacing a selected tool carrier into an operational position in alignment with said driving spindle, means for coupling said driving spindle to the selected tool carrier and means for displacing said tool carrier in a feeding direction, a combination comprising a direct current motor for driving said driving spindle, said motor having a relatively stable torque in a wide range of rotational speeds, programmable means for electrically controlling the rotational speed of said motor and the feeding movement of said tool carrier according to a predetermined program prepared for machining a particular workpiece, additional clutch means for coupling said turret wheel to said driving motor, and wherein said turret wheel has an axle provided with a gear, said gear being engageable with transmission gears to said driving motor.

In a machine tool having a driving spindle, a turret wheel for holding a plurality of tool carriers and for displacing a selected tool carrier into an operational position in alignment with said driving spindle, means for coupling said driving spindle to the selected tool carrier and means for displacing said tool carrier in a feeding direction, a combination comprising a direct current motor for driving said driving spindle, said motor having a relatively stable torque in a wide range of rotational speeds, programmable means for electrically controlling the rotational speed of said motor and the feeding movement of said tool carrier according to a predetermined program prepared for machining a particular workpiece, additional clutch means for coupling said turret wheel to said driving motor, said additional clutch means including a spline shaft and a coupling gear having a grooved central passage for engaging the splines of said spindle shaft, and wherein said driving spindle is positively connected to the driving gear, said driving gear being in mesh with said coupling gear.

In a machine tool having a driving spindle, a turret wheel for holding a plurality of tool carriers and for displacing a selected tool carrier into an operational position in alignment with said driving spindle, means for coupling said driving spindle to the selected tool carrier and means for displacing said tool carrier in a feeding direction, a combination comprising a direct current motor for driving said driving spindle, said motor having a relatively stable torque in a wide range of rotational speeds, programmable means for electrically controlling the rotational speed of said motor and the feeding movement of said tool carrier according to a predetermined program prepared for machining a particular workpiece, additional clutch means for coupling said turret wheel to said driving motor, and wherein said coupling mechanism for said tool spindle includes an intermediate coupling disc co-axially attached to said driving spindle and defining two opposite coupling surfaces, said driving spindle being axially movable between a first switching position in which one coupling surface of said intermediate member is in engagement with said coupling gear and a second position in which said one coupling surface is disengaged from said coupling gear and the other coupling surface is in engagement with said drill spindle.