JPS6110902Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pallet changer that alternately exchanges pallets on a table of a machine tool.

Pallet changers that automatically exchange pallets on the table of a machine tool are widely used in order to prevent a decrease in the operating rate of a machine tool due to workpiece setup work. However, when exchanging pallets, conventional pallet changers first pull out processed pallets to a waiting station, but at this time, the exchange claw of the exchange arm operated by a hydraulic cylinder etc. moves forward, hooks it on the hook, and then retreats in one reciprocating motion. and one reciprocating operation to pull out the unprocessed bullet to the processing position with the exchange arm in the same manner as above, totaling 2
Since it is a reciprocating operation, replacement time is long and productivity is low. Further, when attempting to rotate the pallet for setup at the pallet standby position, the exchange arm becomes jammed, so the pallet must be lifted and rotated, necessitating a lifting mechanism, increasing costs.

The purpose of the present invention is to eliminate such drawbacks and to provide a pallet changer that can shorten the pallet exchange time and enable setup rotation in a stable state at the standby position.

The present invention will be explained below with reference to figures showing one embodiment. In Fig. 1, the machine tool saddle 11
A pallet changer 12 is provided near the pallet changer 12. The frame 13 of the pallet changer 12 is mounted on a saddle, and has a standby station 14 rotated by a drive mechanism (not shown).
are provided in parallel in the longitudinal direction of the saddle 11. Two guides 15 are attached to the top surface of the waiting station 14 to guide the pallet.
A left arm 16 and a right arm 17 are placed near the ends of the frame 13 on the left and right sides thereof, and the respective arms 16 and 17 are arranged as shown in FIGS.
As shown in the figure, it has two links 18 and 19 rotatably attached to the frame 13 on one side and the arm 16 or 17 on the other side, and the link 18 on one side is connected to the link 20 via a shaft 41. connected. When this link 20 is swung by the cylinder 21, the arms 16 and/or 17 move left and right in FIG. 1 while maintaining their parallel state. Note that FIG. 1 shows the retracted position.

A shuttle claw 22 is inserted into the inner groove of the left and right arms 16 and 17, and this shuttle claw 22 is connected to the front and rear sprockets 23 and 24.
Since the sprocket 23 on one side is connected to the hydraulic motor 35 below, the hydraulic motor 35
By driving the shuttle claw 22, the shuttle claw 22 is moved in the front-back direction. There is a table 27 on the upper surface of the saddle 11 for placing a pallet 26 on which a workpiece (not shown) is placed and performing machining, or for moving the pallet 26 back and forth. A clamp plate 28 is provided for movable clamping of the pallet 26. Further, a fixed guide 29 is fixed to the frame 13 between the table 27 and the frame 13 in order to guide the pallet 26. Further, in order to position the pallet 26 with respect to the table 27, a rod 31 which is moved up and down by a cylinder 30 is inserted as shown in FIG. (See Figure 1). Note that the reference numeral 33 is also a pallet, and since unprocessed items are placed on this pallet 33, this pallet will hereinafter be referred to as an unprocessed pallet, and the pallet 26 on the table 27 described above will be referred to as a processed pallet.

Next, the operation of the present invention will be explained with reference to FIGS. 5 to 8. FIG. 5 shows when the machining of the workpieces on the machined pallet 26 has been completed and the table 27 has been moved to a position facing the waiting station 14 on the right side, and at this time, the left and right arms 16 and 17 inward to engage the shuttle claws 22 with the hooks 32 of pallets 26 and 33. Figure 6 shows the right arm 17.
This figure shows a state in which the processed pallet 26 is moved from the table 27 to the standby station 14 by the shuttle claw 22 by driving the side hydraulic motor 35 (see FIG. 3). FIG. 7 shows the table 27 moved to the left to a position facing the waiting station 14 on the left side. FIG. 8 shows the unprocessed pallet 3 on the left waiting station 14 and already engaged with the shuttle claw 22.
3 to the table 2 by advancing the shuttle claw 22.
7 shows when it has been moved to the top. After this, if the table 27 is moved to the processing position, the pallet changer is completed.

As mentioned above, the pallet changer of the present invention consists of a frame in which two standby stations are arranged in parallel in the longitudinal direction of the saddle close to the saddle of the machine tool, and two links located near both left and right ends of the frame. A set of arms that move in the left and right direction while maintaining a parallel state through the pallet, and a set of arms that are located in the grooves of the arms and are driven by a motor via a roller chain, and that are engaged with or disengaged from the pallet by movement of the arms. It was composed of a shutter claw that was made into

For this reason, the shuttle claw, which plays a major role during pallet exchange, only moves forward when moving processed and unprocessed pallets, and there is no return movement, which shortens the exchange time. Furthermore, since the pair of arms near both ends of the frame approach the pallet only when exchanging the pallet, the pallet can rotate freely when the pallet is on standby, which has the advantage of lowering costs.

[Brief explanation of the drawing]

Each of the figures shows an embodiment of the present invention, and Fig. 1 is a plan view, Fig. 2 is a partially sectional plan view, and Fig. 3 is a partially sectional side view of Fig. 1 from three directions. 4 is a partially sectional side view of FIG. 1 viewed from four directions, and FIGS. 5 to 8 are plan views schematically showing the operation of the present invention. 11...Saddle, 13...Frame, 14...
Waiting station, 16, 17...Arm, 1
8, 19... Link, 22... Shuttle claw, 2
5...Roller chain, 35...Motor.

Claims (1)

[Scope of utility model registration request] In a machine tool, a frame provided adjacent to a saddle provided with a movable table; a pair of standby stations provided on the frame and capable of moving pallets between them;
a pair of arms that are located near both left and right sides of the frame and are movable in parallel in the left and right direction via two links; a drive cylinder that is supported by the frame and moves the pair of arms in the left and right direction;
A pallet changer supported by the frame and comprising a shuttle claw for moving the pallet back and forth between the standby station and the table from a motor via a chain.