Abstract: A telescopic cover has a plurality of cover pieces nested in the order of their size for extension and retraction. A rubber cushion is on a side surface of an end portion of an insert-side cover piece, a wiper is inside an upper surface of a receiving-side cover piece receiving the insert-side cover piece so as to contact the upper surface of the insert-side cover piece, and a stopper is on the inner side surface of the end portion so as to be offset from the position of the wiper and face the rubber cushion. When the telescopic cover is retracted so that the respective end surfaces of the receiving-side and insert-side cover pieces become flush with each other, a gap between the cover pieces is closed by the wiper.

Abstract: To provide a telescopic cover having a structure in which a stopper is easy to be exchanged, and a machine tool. A telescopic cover of a machine tool is formed to be freely expandable and contractible in a predetermined direction. A first cover piece and a second cover piece have a pair of receiving side stoppers that project outward in both ends of side surfaces along a predetermined direction, and slits formed along the predetermined direction in between the pair of receiving side stoppers, as receiving side cover pieces. The second cover piece and the third cover piece have nesting side stoppers that are inserted into the slits by projecting outward in the side surfaces along the predetermined direction, and move between the pair of receiving side stoppers as nesting side cover pieces.

Abstract: A machine tool includes: two Y-axis sliders arranged parallel to each other on the bed for allowing the saddle to move in the first direction; two X-axis sliders arranged parallel to each other on the saddle to move the table; and a controller. The controller, before controlling a first motor to move the saddle, controls a second motor to move the table so that the centroid position of a moving object assembly including the table and a loaded object placed on the table is positioned in a predetermined range including the center position between the two Y-axis sliders.

Abstract: To provide a telescopic cover having a structure in which a stopper is easy to be exchanged, and a machine tool. A telescopic cover of a machine tool is formed to be freely expandable and contractible in a predetermined direction. A first cover piece and a second cover piece have a pair of receiving side stoppers that project outward in both ends of side surfaces along a predetermined direction, and slits formed along the predetermined direction in between the pair of receiving side stoppers, as receiving side cover pieces. The second cover piece and the third cover piece have nesting side stoppers that are inserted into the slits by projecting outward in the side surfaces along the predetermined direction, and move between the pair of receiving side stoppers as nesting side cover pieces.

Abstract: A telescopic cover has a plurality of cover pieces nested in the order of their size for extension and retraction. A rubber cushion is on a side surface of an end portion of an insert-side cover piece, a wiper is inside an upper surface of a receiving-side cover piece receiving the insert-side cover piece so as to contact the upper surface of the insert-side cover piece, and a stopper is on the inner side surface of the end portion so as to be offset from the position of the wiper and face the rubber cushion. When the telescopic cover is retracted so that the respective end surfaces of the receiving-side and insert-side cover pieces become flush with each other, a gap between the cover pieces is closed by the wiper.

Abstract: A machine tool includes a saddle supported by a guide member installed on a bed and configured to move relative to the bed in a first direction and a table supported by a guide member installed on the saddle and configured to move relative to the saddle in a second direction orthogonal to the first direction. The machine tool further includes a protective cover installed on a side face of the table or the saddle which is parallel to a travel direction of the table or the saddle and adapted to protect the guide member from chips and a scraper installed on the protective cover and adapted to scrape out chips built up in a neighborhood of the guide member.

Abstract: A slide door of a machine tool which slide door is constituted by first and second doors for opening and closing, in a sliding manner, an opening of the machine tool includes: a first nut fixed to the first door; a first ball screw engaged threadedly to the first nut; a second ball screw placed in parallel with the first ball screw; a second nut engaged threadedly to the second ball screw and fixed to the second door is fixed thereto; and a motor for driving the first and second ball screws via a power transmission mechanism.

Abstract: A machine tool has a telescopic cover. One end of the telescopic cover is fixed to the machine tool via a cover supporting member. In the cover supporting member, through holes through which fixing bolts pass are formed on a surface to be fixed to the telescopic cover and a surface to be attached to the machine tool. Gaps between the through holes and fixing bolts are used to adjust the attachment position of the cover supporting member with respect to the machine tool and the position of the telescopic cover with respect to the cover supporting member.

Abstract: A telescopic cover of a machine tool is provided with two movable covers connected by a joint, two pulleys mounted on the joint, and a single wire stretched around and between the two pulleys. One and the other ends of the wire are secured to the mobile element, and a middle portion of the wire to a fixed portion. In this arrangement, the two movable covers connected by the joint move half the movement stroke of the mobile element in association with the action of the mobile element.

Abstract: A machine tool includes a saddle supported by a guide member installed on a bed and configured to move relative to the bed in a first direction and a table supported by a guide member installed on the saddle and configured to move relative to the saddle in a second direction orthogonal to the first direction. The machine tool further includes a protective cover installed on a side face of the table or the saddle which is parallel to a travel direction of the table or the saddle and adapted to protect the guide member from chips and a scraper installed on the protective cover and adapted to scrape out chips built up in a neighborhood of the guide member.

Abstract: A telescopic cover of a machine tool is provided with two movable covers connected by a joint, two pulleys mounted on the joint, and a single wire stretched around and between the two pulleys. One and the other ends of the wire are secured to the mobile element, and a middle portion of the wire to a fixed portion. In this arrangement, the two movable covers connected by the joint move half the movement stroke of the mobile element in association with the action of the mobile element.

Abstract: A feeder for a machine tool adapted to move a table relative to a saddle by rotation of a motor includes a ball thread nut fixed to the saddle and a ball thread shaft that engages with the ball thread nut in a rotatable manner but is immovable in an axial direction of the ball thread shaft relative to the table. The motor is fixed to the table and the ball thread shaft is coupled to the motor. A sum of a movable distance of the table relative to the saddle and a length of the saddle in the axial direction is shorter than a length of the table in the axial direction. The feeder further includes rails fixed to the table on its surface where the motor is fixed and bearings that are fixed to the saddle and bear the rails.

Abstract: A feeder for a machine tool moves a table relative to a saddle in one axial direction by rotation of a motor. A ball thread shaft is attached in a manner engaging with a nut fixed to the saddle, and rotatable but immovable relative to the table, and is coupled to the motor fixed to the table. A length obtained by adding a relative movement distance S of the saddle relative to the table to a size Ls of the saddle in a direction of movement relative to the table is shorter than a size Lt of the table in a direction of movement relative to the saddle (i.e., (Ls+S)<Lt).

Abstract: An N-acylamino acid compound represented by the general formula (1):R--CO--(NH--X--CO).sub.n --OR.sup.1 (1)wherein (NH--X--CO) is an amino acid residue, X in (NX--X--CO) is variable with the kind of amino acid to be used, R--CO is a saturated or an unsaturated fatty acid residue having 6 to 24 carbon atoms, R.sup.1 is hydrogen atom, sodium atom, potassium atom, or methyl group and n is an integer in the range of from 1 to 3, indicating that at least one histidine is contained as a component amino acid is disclosed, which is obtained by causing an N-hydroxysuccinimide ester to react with an amino acid or a peptide.The compound excels in antioxidizing power, emulsifying power, antibacterial power, chelating power, infrared absorbing power, and humidity-retaining power.