Abstract: A feeder for rods into a lathe by a motorized thruster for sliding and pushing a rod along a guide towards a processing lathe until the rod is taken by the lathe. An automatic control device actuates the thruster to advance according to a first thrust value and a sensor detects the movement of the thruster. If the sensor detects a minimum movement or no movement at all a thrust increase is commanded up to a predetermined maximum value. If the thruster does not move at all, this indicates jamming.

Abstract: A feeder for rods into a lathe comprising a motorized thruster for sliding and pushing a rod along a guide towards a processing lathe until the rod is taken by the lathe. An automatic control device actuates the thruster to advance according to a first thrust value and a sensor detects the movement of the thruster. If the sensor detects a minimum movement or no movement at all a thrust increase is commanded up to a predetermined maximum value. If the thruster does not move at all, this indicates jamming.

Abstract: An automatic bar-loader for lathes including a channel for feeding of a bar to the lathe mandrel and a bar-pusher powered by an electric motor controlled by a control unit and having a head collet for grasping the tail of a bar in the channel to make it run therein. The loader includes a sensor for measurement of the axial shifting of the bar-pusher designed for supplying a feedback signal to the control unit for control of the bar-pusher motor.

Abstract: A bar magazine for lathes includes at least one channel designed to receive a bar being machined and pushed along the channel by a bar-pusher collet. The magazine includes at least one bar centering member arranged in a zone along the channel. The bar centering member is movable, upon passage of the collet in the zone, between a first position of engagement with the bar for to center the bar in the channel and a second position removed from the bar to allow passage of the bar-pusher collet through the zone.

Abstract: An automatic bar-loader for lathes including a channel for feeding of a bar to the lathe mandrel and a bar-pusher powered by an electric motor controlled by a control unit and having a head collet for grasping the tail of a bar in the channel to make it run therein. The loader includes a sensor for measurement of the axial shifting of the bar-pusher designed for supplying a feedback signal to the control unit for control of the bar-pusher motor.

Abstract: A bar magazine for lathes including at least one channel designed to receive in it a bar being machined and pushed along the channel by a bar-pusher collet with said magazine including at least one bar centering member arranged in a zone along the channel and characterized in that said centering member is movable upon passage of the collet in said zone between a first position of engagement with the bar for its centering in the channel and a second position removed from the bar to allow passage of the bar-pusher collet through said zone.

Abstract: An automatic lathe bar magazine comprises a feed channel (11) for a bar to the lathe chuck and a powered bar pusher (15) grasping with a head collet (17) the tail of a bar in the channel to cause it to run therein. The bar pusher (15) is made telescopic to have an outermost part (18) running with reduced side play in the channel (11) acting as a guide therefor and an internal part (16) with smaller diameter bearing at its head said collet (17) and growing longer on command from the outermost part to protrude from the magazine and enter the lathe. In this manner the bar being machined does not touch the channel and this greatly reduces vibrations and noise produced by the high speed rotation of the bar.

Abstract: An automatic bar feeder for automatic multispindle lathes comprises a revolving drum (12) supporting guides (15) for the running of bars to take them in succession into positions of advancement and machining in a lathe. The guides (15) are equipped with a running bar pusher (17) powered with a hydraulic motor (18) for running of the bars therein. The feeder (10) comprises a first sensor unit (21) which emits signals which are a function of the position of an advancing bar. The signal is received by a control device (23) which commands a proportional flow rate valve (24) for fluid feed to the hydraulic motor to control the movement of the bar by feedback.

Abstract: The devices guides a bar that is advanced by the retractable collet of a bar feeder magazine to the mandrel of a lathe by employing an insert which is slidable with slight clearance within a duct that is connected to the mandrel. The insert has therethrough an axial passage registering at one end with an inlet end of the duct, which is disposed to receive the bar and collet, and the opposite end of the passage designed to be traversed by the bar with slight clearance. The insert is disposed to be engaged and impelled by the advancing collet along the duct a predetermined distance towards the mandrel, after which means is provided to engage and effect return of the insert to a starting position close to the inlet end of the duct upon re-extraction of the collet from the duct.

Abstract: A rotary loader for feeding bars to lathes comprises a stepped rotary drum (11) and supporting guides (13) for sliding of the bars. A flange (16) coaxial and integral with the drum supports peripherally braking surfaces (17) such as pins arranged with a pitch equal to the drum braking pitch. An opposing surface (20) is pushed elastically towards the drum rotation axis to meet the braking surfaces in sequence and supply drum braking and stopping action against its inertial movement.

Abstract: A centering device for rods fed to a lathe is designed to be arranged between a rod feeder outlet and a lathe inlet and comprises at least one centering unit (11) having a passage port therein to be run through by a rod to which it supplies lateral containment. The centering unit (11) comprises a first (14) and a second (15) sectors superimposed with each sector having a passage (16 or 17) therein. Linkage actuators (18,19) operable to move the superimposed sectors to change the superimposed quantity of the passages (16,17) therein and thereby the rod passage port.

Abstract: A support and centering device for a fed bar, in a bar magazine for lathes, comprises a plurality of rods (11) supported at the ends by a first (12) and a second (13) support elements facing each other. The rods (11) are such arranged as to identify a passageway (19) for the bar internally of the plurality of rods and the support elements (12, 13) are mutually rotatable about the passageway axis (36) to tilt the rods (11) relative to this axis, thereby varying the transverse size of the passageway. The supports are spring urged against each other to provide a spring support to the bar and enable passage of a pusher of the bar magazine.

Abstract: A loading device comprises a pusher for feeding a bar along a guide towards a lathe spindle. The pusher comprises a first thrust part (16, 116) which is constrained to traversing means (14) along, said path. Said first part comprises a constraint element (18, 118) for coupling with a complementary constraint element (19, 119) located on a second and removable pusher part (17, 117) which constitutes the axial extension of the first part along the guides. The two elements (18, 118, 19, 119) extend axially between the first and second parts and have their transverse dimension within the transverse dimension of the guide to run therein.

Abstract: A device (10,110) for loading bars in an automatic lathe comprises guide means (19,119,119') along which is supported and made to run a bar (12,112) with leading end projecting from said guide means to be inserted in a lathe chuck (11,111) to be grasped by handling means (21,121) of the lathe moving parallel to the bar axis to feed the bar under machining tools (31,131). At least a first part of the guide means (19,119,119') nearest the chuck has kinematic connection with the handling means (21,121) for moving axially and substantially synchronously therewith.

Abstract: A device (10) for loading bars in an automatic lathe comprises a pusher (13) with handling means (15,18) to push axially the leading end of a bar (12) into a lathe chuck (11) to be grasped by lathe means (21) moving parallel to the bar axis to feed the bar under machining tools (31). The pusher (13) with its own handling means (15,18) is supported on a truck (24) moving along guides parallel to the direction of movement of the bar (12). The truck (24) comprises connection means (30) to be constrained to the lathe bar-feed means for moving synchronously therewith.

Abstract: A loading device for sequential loading of bars in machine tools comprises chutes (16) for arrival of a bar against stops (17) for stopping in a withdrawal position. Beyond the stops (17) there is a guide (20,20') for axial sliding of a bar in a direction aligned with the inlet of a machine tool (14). Raising elements (22) have their upper surface (23) inclined and terminating with a stop part (24) arranged substantially vertically to the guide (20,20'). Said raising elements (22) are mobile between a first position below the chutes (16) and the guides (20,20') and a second position above the stops (17) and the guides (20,20') in which they raise the bar placed in the withdrawal position to cause sliding onto the upper inclined surface (23) toward the guide ( 20,20') to a stop position (26). Upon return of the raising elements to the first position the bar in the stop position (26) is placed on the underlying guides (20,20') to be pushed by (pushers) (37,38) into the machine tool.

Abstract: A guide (10) for automatic bar feeders for lathes, comprises a plurality of elements (11) with a C-shaped guiding portion (16), disposed aligned and facing each other to form a channel through which the bar (15) slides. Each C-shaped portion (16) is supported by an arm (17) connected to it in an assymetrical position to define portions (19 and 20) of different lengths so as to uniform the flexibility of the elements (11) due to the arm variations with respect to their point of connection (12) to the rest of the feeding device (13, 14).

Abstract: A control device for feeding metal bars to a multispindle automatic lathe comprises a rotating drum which bears a plurality of bar pushers arranged peripherally and equidistantly from each other, control means being associated with said bar pushers. In accordance with the invention said control means consist of a hydraulic motor for each bar pusher, said motor being fixed to said rotating drum. Fluid under pressure is fed selectively to at least one or more of said hydraulic motors, depending on the feed requirements, through a unit which comprises a distributor designed to place in communication fluid delivered under pressure with said at least one or more motors during rotation of the drum to which it is constrained.

Abstract: A device for controlling in sequence or at the same time the feed of metal bars into a suitable guide equipment for supplying the bars to an automatic multi-spindle lathe is described.In order to connect the main control or drive to the bar feeding apparatus, the device includes a clutch, the coupling and decoupling of the clutch being caused by the rotation of the guide equipment. The portion of the clutch which is connected to the drive can rock around the axis of its support on the fixed frame during the coupling operation, and a return spring is provided to return rockable portion back to its starting position ready for the next coupling operation.

Abstract: An apparatus for feeding bars to a machine tool, in particular a multispindle lathe, comprising a plurality of pairs of opposed arrays of respectively stationary and movable jaws extending radially from a rotary drum, wherein the movable array of each pair can be distanced from the opposed, stationary array through the intermediary of a control system.The stationary arrays are formed of side-by-side sets of jaws extending radially in one piece from respective central hubs fitted onto the drum and there locked against rotation, whereas the movable arrays are secured to radial tongues swing-mounted on axles carried by the stationary arrays. The control system for the movable arrays is, on the contrary, carried by sets of radial tongues extending from respective central hubs which are also fitted and locked to the drum between the sets of jaws.