JPH0123719Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an indexing and rotating device for a pallet for supporting a workpiece in a machine tool or the like.

[Conventional technology]

Conventionally, in a pallet feeding mechanism in which a pallet holding and fixing a workpiece is reciprocated in a linear direction using a chain drive method, the pallet is positioned at a predetermined rotational angle position around a spindle. In other words, workpiece indexing is usually done manually, and it has been difficult to develop a technique for automatically indexing pallets by driving a chain.

[Problem that the invention attempts to solve]

The present invention was developed in view of the above-mentioned circumstances of the conventional chain drive type pallet feeding mechanism, and its purpose is to use the same drive device for the linear feed movement and indexing rotation of pallets using the chain drive type. The object of the present invention is to provide a pallet indexing and rotating device that enables the pallet indexing and rotation.

[Means for solving problems]

In order to achieve the above object, the present invention fixedly supports a turntable that slidably supports a pallet toward a machine tool on a rotating main shaft that is pivotally supported on a base, and pivots are placed on the turntable at appropriate intervals. A first chain is installed between the supported sprockets, and a second chain is provided that transmits the rotation of the sprocket that rotates while being pivotally supported by the rotating main shaft to the first chain, and is fixed to the first chain. A pallet indexing and rotating device is used as a pallet indexing and rotating device, the drive rod being slidably engaged with a guide fitting fixed to the pallet, and provided with a restraining means for restraining the movement of the drive rod. It is.

[Effect]

driving the first chain, winding the second chain, sending the pallet toward the machine tool by engaging the drive rod and the guide fitting, and restraining the drive rod at a predetermined position by a restraining means; The winding of the first and second chains is stopped, and the sprocket of the second chain is rotated about the main axis of rotation to index and rotate the turntable and the pallet placed thereon.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

In Figure 1, a movable table 2 is placed on a base 1.
is supported so as to be slidable in a direction (Z direction in FIG. 1) toward or away from a machine tool (not shown). A bracket 3 is fixed to the movable table 2, and a cylinder 4 engages with the bracket 3 to move the movable table 2 in the Z direction. The rotating main shaft 5 is pivotally supported by the movable table 2 via a bearing 6 or the like. A turntable 7 is fixed and supported by collars 8, bolts 9, etc. above the rotating main shaft 5 in the drawing. Palette 1 is placed on the turntable 7 as shown in Figure 2.
0 is placed so as to be slidably reciprocated along the direction toward the machine tool (Z direction).

Further, sprockets 11 and 12 are pivotally supported on the turntable 7 at appropriate intervals, and a first chain 13 is installed between the sprockets 11 and 12. Note that the first chain 13 is formed in a two-row structure to ensure more reliable transmission.

A sprocket 15 is pivotally supported in the space between the turntable 7 and the movable table 2 of the rotating main shaft 5 via a bearing 14. Specifically, a large gear 16 is pivotally supported on the rotating main shaft 5 via a bearing 14, and a sprocket 15 is fixed to the outer periphery of the large gear.

Sprocket 1 pivoted to turntable 7
A sprocket 18 is fixed to the shaft 17 of the shaft 1.
There is a second sprocket between sprocket 18 and sprocket 15.
A chain 19 is constructed.

A rod support 20 is fixed to the first chain 13, and a drive rod 21 is fixed to the rod support 20.
The head 21a of the drive rod 21 is slidably engaged in a groove 23 of a guide fitting 22 fixed to the pallet 10. As shown in FIGS. 2 and 3, the guide fitting 22 is formed with an elongated groove 23 that opens at both ends, and the length is such that the drive rod 21 is connected to the first chain 13.
The drive rod 21 and the groove 23 are formed to have an appropriate shape that does not disengage from the groove 23 when the drive rod 21 and the groove 23 rotate together.

Next, the restraining means will be explained.

The stopping means is the drive rod 21, more precisely, the rod support 20.
a locking rod 24 that removably abuts on the outer periphery of the locking rod 24; a bracket 25 that slidably supports the locking rod 24 and is fixed to the turntable 7;
A handle 26 (more precisely, for example, a pinion fixed to the handle,
(The locking rod 24 is moved in and out through a rack formed on the locking rod 24.), a detection means 27 for detecting the locking rod 24 is moved in and out, and the like. When the locking rod 24 comes into contact with the rod support 20, the first chain 13 cannot be wound, and when it is released, the first chain 13 can freely roll.

A small gear 28 meshes with the large gear 16, and the small gear 2
8 is a hydraulic motor 29 fixed to the movable table 2
Rotationally driven by.

Further, a cylinder 31 that moves the lock pin 30 in and out is fixed to the movable table 2, and a lock bush 32, in which the lock pin 30 engages in a manner that allows the lock pin 30 to move in and out, is formed on the turntable 7 in a manner corresponding to the indexing angle. (4 pieces indexed at 90 degrees).

Furthermore, although not shown, the hydraulic motor 29 is controlled by a control means (not shown) so as to rotate by an amount corresponding to the indexing angle. Further, the detection means 27, cylinder 31, etc. are tuned and adjusted by the above-mentioned control means.

Next, the operation of this embodiment will be explained.

First, the operation of moving the pallet 10 in the Z direction will be explained. Pull down the locking rod 24 to free the drive rod 21. When the hydraulic motor 29 is rotated, the small gear 2
8. The sprocket 15 rotates via the large gear 16, and the sprocket 18 is rotated by the second chain 19.
And the sprocket 11 rotates. Therefore, the first
The chain 13 rotates, and along with this, the drive rod 2
1 moves. Since the drive rod 21 is engaged with the guide fitting 22 as described above, it presses the pallet 10 in the Z direction while sliding in the groove 23, and moves the pallet 10 toward the machine tool. The initial positioning of the pallet 10 is performed by the cylinder 4, and the moving in and out of the machine tool table (not shown) for the pallet 10 is performed by the first and second chains 13, 19.
This will be done by.

Next, the indexing operation of the pallet 10 will be explained.

The locking rod 24 is advanced by the handle 26 to restrict movement of the driving rod 21. Therefore, the rotation of sprockets 11, 12, and 18 is restricted. Therefore, when the hydraulic motor 29 rotates, the sprocket 15 rotates around the main shaft 5, and the turntable 7 rotates together with the sprocket 15 around the main shaft 5. Appropriate indexing is performed by appropriately controlling the rotation of the hydraulic motor 29. In this embodiment, when the turntable 7 rotates 90 degrees, the lock pin 30 is advanced by the cylinder 31 and inserted into the lock bush 32, and the rotation is performed by 90 degrees. Dispatch is made. Thereafter, 180 degree and 270 degree indexing is performed in the same manner.

As described above, by locking and releasing the locking rod 24 and winding the first and second chains 13, 19, rotational indexing and loading/unloading of the pallet 10 are automatically and easily performed.

[Effect of idea]

As is clear from the above description, according to the present invention, the chain drive system has the effect of enabling linear feeding movement and indexing rotation of the pallet.

[Brief explanation of the drawing]

FIG. 1 is an axial sectional view showing one embodiment of the present invention, FIG. 2 is an explanatory side view showing the state of engagement between the pallet and the drive rod in the direction of the arrow in FIG. 1, and FIG. It is an explanatory plan view explaining an effect. 1...Base, 2...Movable table, 3...Bracket, 4...Cylinder, 5...Rotating main shaft, 6...Bearing, 7
...turntable, 8...color, 9...volt, 10
...Pallet, 11, 12, 15, 18... Sprocket, 13... First chain, 14... Bearing, 16
...Big gear, 17...Axle, 19...Second chain, 2
0... Rod supporter, 21... Drive rod, 22... Guide metal fitting,
23...groove, 24...locking rod, 25...bracket, 2
6... Handle, 27... Detection means, 28... Small gear,
29...Hydraulic motor, 30...Lock pin, 31...Cylinder, 32...Lock bush.

Claims (1)

[Scope of utility model registration request] A pallet indexing and rotation device that moves a pallet in and out of a machine tool side, and also indexes and rotates the pallet to a predetermined position, comprising: a movable table that reciprocates on a base in a direction toward or away from the machine tool; A rotary main shaft pivotally supported by a movable table, a turntable fixedly supported by the rotary main shaft and slidably supporting the pallet along the above direction, and pivots arranged at appropriate intervals on the turntable. a first chain that winds between supported sprockets; a second chain that is installed between the sprocket that rotates while being pivotally supported on the rotational main shaft; and the axis of the sprocket that is pivotally supported on the turntable.
and fixed to the first chain,
A drive rod slidably abuts and engages with a guide fitting fixed to the pallet, and a drive rod fixed to the turntable side and removably engaged with the drive rod to restrain or release the movement of the drive rod. 1. A pallet indexing and rotating device, characterized in that a pallet indexing and rotating device is provided with a restraining means for