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WO-2026095028-A1 - WORKPIECE CONVEYANCE DEVICE AND MACHINE TOOL

WO2026095028A1WO 2026095028 A1WO2026095028 A1WO 2026095028A1WO-2026095028-A1

Abstract

This workpiece conveyance device (200) comprises: a ball screw (231) having a screw (232) into which rotation is inputted, and a nut (233) that engages with the screw (232); and a double-speed mechanism (240) having an intermediate member (241) to which the nut (233) is attached and which is capable of sliding along a first direction (101), a pinion (243) which is attached to the intermediate member (241), and a first rack (246) and a second rack (247) which engage with the pinion (243) and extend in the first direction (101), the double-speed mechanism (240) outputting, through the second rack (247), a sliding motion along the first direction (101) toward a hand (261) for holding a workpiece. The screw (232) and the intermediate member (241) are disposed so as to be displaced from each other in a second direction (102) orthogonal to the first direction (101).

Inventors

  • NONAKA, TAKAAKI

Assignees

  • DMG森精機株式会社

Dates

Publication Date
20260507
Application Date
20251031
Priority Date
20241101

Claims (10)

  1. A ball screw having a screw to which rotation is input, and a nut that engages with the screw, The device comprises an intermediate member to which the nut is attached and which is slidable along a first direction, a pinion attached to the intermediate member, and a double-speed mechanism having a first rack and a second rack that engage with the pinion and extend in the first direction, and which outputs a sliding motion along the first direction toward a hand for holding a workpiece through the second rack, A workpiece transport device in which the screw and the intermediate member are arranged offset in a second direction perpendicular to the first direction.
  2. The workpiece transport device according to claim 1, wherein the first direction is oblique to the vertical direction.
  3. In the second direction, a first servo motor is positioned opposite the screw, The workpiece transport device according to claim 1 or 2, further comprising a transmission mechanism for transmitting rotation from the first servo motor to the screw.
  4. The aforementioned transmission mechanism is, A first pulley connected to the output shaft of the first servo motor, A second pulley connected to the aforementioned screw, The system includes a timing belt stretched between the first pulley and the second pulley, and further, A first rotating body having a first locking portion and connected to the second pulley, A second rotating body having a second locking portion and rotatably supported between the first pulley and the second pulley, The system comprises an elastic member that applies an elastic force to the second rotating body along the direction of rotation of the second rotating body, The second rotating body operates between a first state in which the second locking portion is positioned away from the first rotating body by being locked by the timing belt, and a second state in which, when the locking by the timing belt is released, the second rotating body rotates due to the elastic force of the elastic member, and the second locking portion locks with the first locking portion, and further, The workpiece transfer device according to claim 3, further comprising a sensor capable of sensing the movement of the second rotating body.
  5. A traveling body equipped with the aforementioned ball screw and the aforementioned double-speed mechanism, which is slidable along a third direction perpendicular to the first direction and parallel to the horizontal direction, The workpiece transport device according to claim 1 or 2, further comprising a second servo motor provided as a power source for the sliding motion of the traveling body along the third direction.
  6. A turret-type tool post that can rotate around a horizontally extending pivot axis, In the horizontal direction perpendicular to the pivot axis, a front cover is positioned at a distance from the tool post, A workpiece spindle is positioned between the tool post and the front cover, and rotates the workpiece around a rotation axis that extends parallel to the pivot axis, A machine tool comprising a workpiece transport device according to claim 1 or 2, which is positioned between the tool post and the front cover and above the workpiece spindle.
  7. The workpiece transport device is, A cover body having an opening that opens in a direction parallel to the pivot axis, which houses the ball screw and the speed-doubling mechanism, The machine tool according to claim 6, further comprising a door rotatably attached to the cover body for opening and closing the opening.
  8. A gap is provided between the cover body and the front cover, and further, The machine tool according to claim 7, comprising a line body that includes at least one of piping and wiring and is routed in the gap.
  9. With additional ceiling covers, The machine tool according to claim 8, wherein the line body extends from the workpiece spindle and is supported by the ceiling cover.
  10. With additional ceiling covers, The machine tool according to claim 7, wherein the cover body is attached to the ceiling cover.

Description

Workpiece handling equipment and machine tools This invention relates to a workpiece handling device and a machine tool. For example, Japanese Patent Publication No. 2000-61704 (Patent Document 1) discloses a workpiece unloading device that transports a machined workpiece mounted on a spindle between a receiving position located below the spindle and an unloading position outside the machining area. This is a perspective view showing a machine tool equipped with a workpiece transfer device and a workpiece retrieval device.Another perspective view showing a machine tool equipped with a workpiece transfer device and a workpiece retrieval device.Figure 1 is a perspective view showing the tool post and the tool post movement mechanism of the machine tool.This diagram shows the internal structure of a machine tool as viewed along the rotation axis of the tool post (with the workpiece transfer device lid closed).This diagram shows the internal structure of a machine tool as viewed along the rotation axis of the tool post (with the workpiece transfer device cover in the open position).Figure 5 shows a partially enlarged view of the internal structure of the machine tool (with the lid of the workpiece transfer device in the open position).This figure shows the operation of the workpiece transport mechanism in Figure 6.Another diagram showing the operation of the workpiece transfer mechanism in Figure 6.Another diagram showing the operation of the workpiece transport mechanism in Figure 6.This figure shows the workpiece transport mechanism (with the arm in the raised position) within the area enclosed by the dashed line X in Figure 8.This figure shows the workpiece transport mechanism (arm in the lowered position) within the area enclosed by the dashed line XI in Figure 9.This is a top view showing the transmission mechanism (when the timing belt is functioning normally).This is a top view showing the transmission mechanism (in the event of a timing belt malfunction).This is a perspective view showing the cover and door of a workpiece handling device.This is a perspective view of the door as seen in the direction indicated by arrow XV in Figure 14.This is a perspective view of the door as seen in the direction indicated by arrow XVI in Figure 14.Figure 2 is a front view showing the machine tool.This is a cross-sectional view showing a machine tool along the line XVIII-XVIII in Figure 17.Figure 4 shows a partially enlarged view of the internal structure of the machine tool (the closed state of the lid of the workpiece transfer device).This is a perspective view showing the door opening/closing drive mechanism and the door open state detection mechanism.This is a cross-sectional view showing the door opening and closing drive mechanism (door in the closed state) in Figure 20.This is a cross-sectional view showing the door opening and closing drive mechanism (door in the open position) in Figure 20.This is a cross-sectional view showing the door open state detection mechanism (door closed state) in Figure 20.This is a cross-sectional view showing the door open state detection mechanism (door open state) in Figure 20.Figure 1 is a perspective view showing the external appearance of the machine tool (with the workpiece retrieval device bucket attached).Figure 1 is a perspective view showing the external appearance of the machine tool (with the workpiece retrieval device bucket removed).This is a cross-sectional view showing the workpiece recovery device in Figure 25 (with the first lid of the bucket closed).This is a cross-sectional view showing the workpiece recovery device in Figure 25 (with the first lid of the bucket open).This is a perspective view showing the bucket (with the first lid closed) as seen from the front.This is a perspective view of the bucket from the rear side (with the first lid closed and the second lid removed).This is a perspective view of the bucket from the rear side (with the first lid open and the second lid removed).This is a perspective view of the bucket from the rear side (with the first lid closed and the second lid attached).This is a cross-sectional view showing the workpiece retrieval device within the area enclosed by the dashed line XXXIII in Figure 27.This is a cross-sectional view showing the workpiece retrieval device within the area enclosed by the dashed line XXXIV in Figure 28. Embodiments of this invention will be described with reference to the drawings. In the drawings referred to below, identical or equivalent components are given the same number. [Overall structure of a machine tool] Figures 1 and 2 are perspective views showing a machine tool equipped with a workpiece transport device and a workpiece retrieval device. In Figure 2, the internal structure of the machine tool 100 is shown by not illustrating the front cover 15, control panel 16, and front door 13, which will be described later. Figure 3 is a perspective view showing the tool post and the tool post movement