The cutting machine for cutting logs of web material, includes a cutting head arranged along the feeding path of the logs. The cutting head includes a coupling for a disc-shaped cutting blade and is designed to impart the disc-shaped cutting blade a rotary motion around the axis thereof and a cyclic movement to cut the logs into single rolls, and to allow the logs to move forward along the feeding path. The machine also includes a store unit for disc-shaped cutting blades associated with the cutting head. A handling member is provided to remove a worn disc-shaped cutting blade from the cutting head and replace the worn disc-shaped cutting blade with a new disc-shaped cutting blade taken from the store unit.

A fast tool changing method with pre-unclamping step for controlling operations of the spindle, tool unclamping cylinder, and tool changing arm. The spindle has one end clamping the tool at the clamping position. The method includes following steps. In a tool pre-unclamping step, the clamp end of the spindle moves the used tool to a pre-unclamping position; the tool unclamping cylinder pushes the used tool to leave a taper of the spindle. In a tool changing step, the tool changing arm rotates to clamp the used tool and pulls the used tool away from the clamp end, and further aligns a target tool with the clamp end. In a tool inserting step, the tool changing arm inserts the target tool into the clamp end, to be clamped therein. Therefore, the tool unclamping and tool clamping operations are accelerated.

A machine tool includes a spindle, a tool exchanger that attaches or detaches one of tools to or from the spindle, a spindle mover that moves the spindle to one of tool exchange coordinates when the one of the tools is to be attached or detached by the tool exchanger, and a tool exchange controller that controls, when the one of the tools is to be attached or detached by the tool exchanger, the spindle mover so as to move, on the basis of a first tool exchange coordinate associated with an attaching-target tool to be attached to the spindle and a second tool exchange coordinate associated with a detaching-target tool to be detached from the spindle, among a preliminarily-set plurality of the tool exchange coordinates respectively associated with the tools, the spindle to one of the tool exchange coordinates that are the first tool exchange coordinate and the second tool exchange coordinate, whichever is farther from a machining point.

Disclosed are an automatic attachment changer and a boring machine having the same. The automatic attachment changer includes a stacker in which a plurality of attachments is stacked in a height direction by a unit of housing cell having a length larger than the attachments such that the attachment is individually arranged in each housing cell horizontally with respect to a bottom of the stacker, a stacker carrier having a carrier body secured to the stacker, a body transfer transferring the carrier body and a carrier power driving the body transfer, and an attachment changer controlling the stacker and the stacker carrier such that a select attachment is selected among the attachments and the select attachment is combined to a spindle assembly. The attachment is changed in the boring machine with high reliability and correctness.

A machining apparatus includes: a shuttle unit (3) that holds a differential case (10) and rotates the differential case (10); a pair of opposed right and left machining units (4); and a tool support (6) that supports a tool (40) for machining the differential case (10), in which the pair of right and left machining units (4) each include a slide mechanism dedicated for uniaxial sliding in right and left directions, the shuttle unit (3) is movable in up and down directions and front and back directions, a tool attached to each of the pair of right and left machining units (4) enables machining an end portion of an inner surface of the differential case (10) and a flange hole of the differential case (10), the end portion surrounding a through hole, and a cutting edge of the tool (40) supported by the tool support (6) enables spherically cutting the inner surface of the differential case (10) held and rotated by the shuttle unit (3).

The present invention is a novel lanyard system for a piece releaseably connected to a tool by a piece receiver that includes a lanyard assembly with a two ended strap and a retraction system fixed to the tool in a storage region of the tool. In particular, one end of the strap is connected to the piece and the other strap end is connected to one end of the retraction system. The other end of the retraction system is connected to the tool. The strap is of sufficient length for the retraction system to retract a piece to the storage region after disconnection from the piece receiver. It is contemplated that the retraction system includes at least one spring (coil or helical) to cause the lanyard system to remain under tension while the piece is mounted in a piece receiver, thereby preventing or at least reducing the strap from interfering with the task at hand, the piece, the piece receiver or tool itself. The retraction system has sufficient tensional force to cause the retraction of a piece to the storage region once released from the work region of the tool.

A blade mounting and dismounting jig is provided for mounting a blade on and dismounting a blade from a flange of a cutting apparatus which includes a boss, a blade mount for mounting the blade fitted thereover, the flange having an annular end face for supporting the blade thereon and being fixed to a distal end of a spindle, and a holder that cooperates with the flange in gripping and securing the blade in position. The blade mounting and dismounting jig includes a cylindrical jig body, a grip coupled to the jig body and having a diameter larger than the jig body, a plurality of first air ejection ports defined in a distal end portion of the jig body, a plurality of second air ejection ports defined in the jig body at a juncture between the jig body and the grip.

A machine tool for machining workpieces comprises at least one tool spindle, at least one workpiece table, at least one first tool magazine, and at least one second tool magazine. The at least one tool spindle and the at least one workpiece table are movable relative to one another along a vertical axis and two horizontal axes to machine a workpiece that is clamped on the workpiece table with a tool that is clamped in the tool spindle. The vertical axis and the two horizontal axes are orthogonal to one another. The at least one first tool magazine, a tool set is provided that comprises a plurality of tools for machining, wherein the tools can be selectively clamped in the tool spindle. The at least one second tool magazine, a tool set is provided that comprises a plurality of tools for machining, wherein the tools can be selectively clamped in the tool spindle. Only one tool magazine of the at least one first tool magazine and the at least one second tool magazine is active at a time, so that exclusively the tool set from the respective active tool magazine is used for machining the clamped workpiece. There is also provided a corresponding method of machining workpieces.

The cutting machine for cutting logs of web material, includes a cutting head arranged along the feeding path of the logs. The cutting head includes a coupling for a disc-shaped cutting blade and is designed to impart the disc-shaped cutting blade a rotary motion around the axis thereof and a cyclic movement to cut the logs into single rolls, and to allow the logs to move forward along the feeding path. The machine also includes a store unit for disc-shaped cutting blades associated with the cutting head. A handling member is provided to remove a worn disc-shaped cutting blade from the cutting head and replace the worn disc-shaped cutting blade with a new disc-shaped cutting blade taken from the store unit.

A cutting blade supplying apparatus includes a cutting blade stocker that stocks a plurality of cutting blades, a carrying unit that carries out the cutting blade from the cutting blade stocker and carries the cutting blade to a cutting apparatus, a transferring unit that transfers the cutting blade carried by the carrying unit to a blade replacing unit of the cutting apparatus, and a control unit. The control unit selects the cutting blade needed by the cutting apparatus and causes the cutting blade to be carried by the carrying unit to the cutting apparatus.