Back to results
US 5,117,544 AGranted
Two-spindle opposed type CNC lathe
AssigneeNakamura-Tome Precision Ind. Co., Ltd.
InventorsSuzuki Kousaku, Okuno Naoki
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeNakamura-Tome Precision Ind. Co., Ltd.
InventorsSuzuki Kousaku, Okuno Naoki
Estimating the term…
A CNC lathe comprising two opposed spindle stocks (2a, 2b) and two turret type tool rests (3a, 3b), in which a base (1) is of a slant type, the first spindle stock (2a) is secured to the base (1), the second spindle stock (2b) is provided to be capable of being moved and located only in a direction to the spindle, and both the tool rests (3a, 3b) are arranged in the deep side of the spindle stocks (2a, 2b). The CNC lathe having said construction in which both spindle stocks include an independent spindle motor (21), a spindle indexing and driving device (23) capable of mechanically releasing connection, and encoders (27, 26) on the side of the spindle, and the indexing and driving device wherein an index motor (40) is rotated on the basis of a phase difference detected by the encoder to match a phase when the spindle indexing and driving device (23) is connected to the spindle 11), so when a work (16) is delivered between both the spindles (2a, 2b). The CNC lathe having said construction comprising a synchronous control device (53) for cutting the output pulses of the encoders 27 mounted on both the spindles through a fine time unit to correct a speed command according to large and small relation therebetween. This invention provides a CNC lathe in the rigidity of the first spindle stock is high, a bar feeder having a conventional construction can be used, and efficiency for working the work including indexing working by both the spindles and efficiency for working a bar material which requires cutting-off when the work is delivered between both the spindles are enhanced much.
In a CNC controlled lathe for forming a work piece into the shape of a rotary body, said lathe having a base and a pair of opposing spindle stocks and associated first and second turret type tool rests located on said base, the first spindle stock being fixedly mounted on the base, the first tool rest being mounted on a ZX slide movable in a direction parallel to the spindle stocks and in a direction at a right angle to the spindle stocks, the second spindle stock being mounted on a Z slide movable only in a direction having an axis parallel to the axes of said spindle stocks, the second tool rest being mounted on an X slide movable only in a direction at a right angle to the direction of the spindle stocks, said first and second tool rests being arranged to the rear of their associated spindle stocks, the improvement wherein the base is arranged at a forwardly directed incline, and the respective first and second spindle stocks are each provided with driving means for rotating said spindles and provided with indexing and driving means for moving said spindle stocks, an encoder for detecting the phase of the spindle, and an encoder for detecting the phase of the spindle stock indexing and driving means, means for mechanically connecting and disconnecting the respective spindles, including a CNC device for selectively controlling the connection and disconnection of the spindle driving means and the spindle stock indexing and driving means with the respective spindles.
Dependencies are inferred from the claim text.