Abstract: Centring device for centring bars, tubes or similar to supply to a spindle of a machine tool, includes: a support base body, along which a through opening is obtained for the passage of the bar, oblong centring elements, connected rotatably to the support base body and arranged circumferentially with respect thereto to maintain the bar axially aligned on the spindle of the machine tool, an elastic element arranged for urging elastically the oblong centring elements to a radial collecting and contraction position in which they are in mutual proximity.

Abstract: An apparatus for advancing and supplying bars to a machine tool, comprises: a plurality of tubular elements each suitable for containing longitudinally a respective bar; at least one first carriage unit and a second carriage unit supporting the tubular elements and movable longitudinally on a drum structure to move the tubular elements parallel to an advancement direction for the bars; the drum structure extends from a front end, suitable for being placed in a position adjacent to a spindle of the machine tool, to a rear end, suitable for being further from the machine tool. Each tubular element is provided with a feed finger unit that is suitable for clamping and pulling a respective bar to advance the bar advancement direction.

Abstract: A propulsion device for a two-wheeled vehicle includes a mechanism for providing traction to a rear wheel for manual advancement of the vehicle and a first epicyclic gear reducer coupled with the mechanism and drivable by a first control device configured for varying the geometric configuration of the first epicyclic gear reducer and thus the gear ratio. A motor for assisting pedalling is interposed between the mechanism for the bottom bracket and the rear wheel and is coupled with a second epicyclic gear reducer, drivable by a second control device configured for varying the geometric configuration of the second epicyclic gear reducer and thus the corresponding gear ratio. The second epicyclic gear reducer is coupled and directly in contact with the rear wheel in order to transmit the movement from the propulsion device thereto.

Abstract: A device and method for recovering and unloading bar crop ends is suitable for use with a loading apparatus for supplying bars to a machine tool. The devices includes a grasping element suitable for engaging a bar-pushing unit of the loading apparatus and a bar crop-end to be taken and unloaded. A slide element receives and conveys the bar crop ends to a collecting zone. A supporting and transferring unit transfers the grasping element from an upper position, in which it is axially aligned on the advancement trajectory of the bar-pushing unit, to a lower position in which it is near the slide element. The device further includes an ejecting unit that is drivable for penetrating the grasping element in the lower position to eject the crop end and sending the crop end, by the slide element, to the collecting zone. A method is also disclosed for recovering and unloading bar crop ends from a machine tool.

Abstract: A device and method for recovering and unloading bar crop ends is suitable for use with a loading apparatus for supplying bars to a machine tool. The devices includes a grasping element suitable for engaging a bar-pushing unit of the loading apparatus and a bar crop-end to be taken and unloaded. A slide element receives and conveys the bar crop ends to a collecting zone. A supporting and transferring unit transfers the grasping element from an upper position, in which it is axially aligned on the advancement trajectory of the bar-pushing unit, to a lower position in which it is near the slide element. The device further includes an ejecting unit that is drivable for penetrating the grasping element in the lower position to eject the crop end and sending the crop end, by the slide element, to the collecting zone. A method is also disclosed for recovering and unloading bar crop ends from a machine tool.

Abstract: An apparatus for feeding bars to a machine tool including an end adjacent a working zone in which a spindle is provided; a drum element, rotatable around an axis; a movable support provided on the drum element for supporting and guiding a bar parallel to the axis. The movable support slidably drivable on the drum element parallel to the axis between a disengagement retracted configuration and an engagement extended configuration. The movable support having telescopic tube configured for being received inside tubular housing and guide for coupling with the spindle. The telescopic tube defines, a cylindrical containing structure configured for enclosing and supporting in a distributed manner a respective bar along the entire supporting zone, so as to prevent the bar from flexing because of the centrifugal actions generated by rotation.

Abstract: An apparatus for feeding bars to a lathe comprises a first end couplable with a spindle of the lathe; a stationary arrangement for guiding and supporting a bar in a first region; a drum element between a first end and an intermediate zone; a movable supporting arrangement provided on the drum element; the movable supporting arrangement is slidably drivable along the drum element parallel to the rotation axis between a contracted disengagement configuration, in which the movable supporting arrangement is collected near the first end to enable a bar to be positioned on the stationary guiding and supporting arrangement, and an extended engagement configuration, in which it is distributed between the first end and the intermediate zone to engage with the respective bar to be supported and guided.

Abstract: An apparatus for feeding bars to a machine tool including an end adjacent a working zone in which a spindle is provided; a drum element, rotatable around an axis; a movable support provided on the drum element for supporting and guiding a bar parallel to the axis. The movable support slidably drivable on the drum element parallel to the axis between a disengagement retracted configuration and an engagement extended configuration. The movable support having telescopic tube configured for being received inside tubular housing and guide for coupling with the spindle. The telescopic tube defines, a cylindrical containing structure configured for enclosing and supporting in a distributed manner a respective bar along the entire supporting zone, so as to prevent the bar from flexing because of the centrifugal actions generated by rotation.

Abstract: A bar feeding device for multi-spindle machine tools includes a rotating drum provided with a plurality of guides for the bars, which longitudinally extend in different angular positions on the outer surface of the drum. Bar pushing members slidingly movable along the guides are connected to a control system comprising a set of peripheral gears circumferentially arranged at one end, and supported to rotate with the drum, coplanarly around a central pinion gear connected to a drive motor. The pinion gear is tangentially arranged in an offset angular position to selectively engage each peripheral gear over a predetermined arch shaped path by rotation of the drum.

Abstract: A guide device for rotatably supporting and for guiding a bar to a spindle of a machine tool; the device comprises: a first and a second set of opposed jaws to receive and rotatably support a bar to be fed to the spindle of the machine; one set of jaws is rotatably journalled by support members to rotate between a closed and an open condition of the guide. Axially spaced apart support members are provided for removable journalling the first and the second set of jaws, and a square rod system longitudinally extending between adjacent support members to slidably engage each set of jaws, preventing rotation of the same jaws in respect to the support square rods. Removable shaft members are provided in the square rod system for rotatably journalling the supporting rods for movable jaws, and elastically biasing elements to rotate the square rods and the set of movable jaws towards the fixed set of jaws of the guide device.

Abstract: An angularly swingable and self-centering bar support device for supporting and guiding bar and tube stock material along a feeding path coaxially arranged to a turning spindle of a machine tool. The device comprises a support frame for at least one idly rotating bar-support which is swingably pivoted to the support frame; and a control means to rotate and selectively lock the bar support in a plurality of positions angularly oriented in respect to the feeding path for the bar.

Abstract: A bar feeder for machine tools, comprising at least first and second carriages for bearing the bars, the carriages being movable along guide rods which are supported at their ends so as to freely oscillate with the carriages and the bar. The guide rods bear the carriages by sliding bushes which maintain the bars parallel and at a suitable distance from one another during oscillations. A supplementary bar guide comprising a bar pushing member is supported between a position coaxially arranged with the supporting carriages and a side or underlying position.