JPH0569653B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a pallet exchange device for exchanging pallets between a machine table and a loading position by means of a rotating arm.

<Prior art> In this type of pallet changing device, a swivel table is provided at the loading position to support the pallet, and the swivel table is rotated to a predetermined angular position so that workpieces can be easily attached and removed at the loading position. We are providing what you can do.

<Problems to be Solved by the Invention> In a pallet changing device equipped with such a swivel table, it is necessary to keep the swivel table fixed when exchanging pallets, but the swivel table cannot be rotated to attach or remove a workpiece. Sometimes it is necessary to make the swivel table rotatable and to connect the pallet to the swivel table.
When replacing the pallet, it is necessary to engage the pallet with the rotating arm, and when the rotating table is rotating, it is necessary to separate the pallet from the rotating arm.

Therefore, in this type of pallet exchange device,
An actuating device that fixes and releases the swivel base from the fixed part, an actuator that engages and disengages the pallet from the swivel base, and an actuator that engages and disengages the pallet from the swivel arm are required. This has led to problems such as complexity and high cost.

<Means for Solving the Problems> In order to solve the above-mentioned conventional problems, the present invention provides a single operation for the engagement and disengagement between the pallet and the rotating arm at the loading position and the engagement and disengagement between the rotating table and the pallet. This is made possible by a device that allows the pallets to be reliably loaded.The configuration is such that a rotating table is rotatably provided at the loading position, a support rail that slidably supports the pallet is provided on the rotating table so that it can be raised and lowered, and the support rail The revolving table is provided with an elevating means for raising and lowering a predetermined amount so that the pallet supported by the revolving arm engages and disengages from the revolving arm, and a knock pin that engages and disengages from the pallet by raising and lowering the support rail by the elevating means. The rotary table is provided with positioning means for positioning the rotary table at a predetermined angular position.

<Operation> With the machine table positioned at a predetermined position, the clamp rail on the machine table and the support rail at the loading position are raised, and the machine table and both pallets at the loading position are respectively engaged with the engaging portions at both ends of the swing arm. will be combined. At the same time, the pallet at the loading position is released from the knock pin on the rotating table. In this state, the pivot arm is pivoted, and both pallets on the clamp rail and the support rail are exchanged. Thereafter, the clamp rail and the support rail are lowered, both pallets are released from the engaging portions at both ends of the swing arm, and the pallet at the loading position is engaged with the dowel pin on the swing table and positioned. When the pallet at the loading position is to be rotated, the positioning of the rotation table is released and the rotation table is positioned at a predetermined angular position.

<Examples> Examples of the present invention will be described below based on the drawings. 1 and 2, 10 indicates a machine table, and this machine table 10 includes a slide table 12 mounted horizontally movably on a bed 11, and a rotary indexable device mounted on the slide table 12. It consists of a suspended index table 13. A support frame 15 is installed on the front surface of the bed 11, and a rotation arm 32 is supported on the support plate 16 fixed to the support frame 15 via a rotation shaft 31 on the machine table 10 side. An arc-shaped support rail 20 and first guide rails 22, 22 are provided concentrically with each other. A clamp rail 21 and second guide rails 23, 23 are provided on the machine table 10 so as to be concentric with the rotation axis 31 at the fixed position of the machine table 10 and continuous with the rails 20, 22, 22. . Each rail 20,2
Pallets 1, 22, and 23 are designed to guide and support pallets 26, 26 on which workpieces (not shown) are removably placed, movably along the arc direction of the pallets via rollers. Engagement blocks 71, 71 that engage with the engagement portion 32a of the pivot arm 32 are provided on the pivot shaft 31 side of each pallet 26, 26.
Note that the clamp rail 21 can move up and down with respect to the table 12, and in the raised state, the upper surface of the clamp rail 21 touches the other rails 20, 22,
It is at the same height as pallet 23 and can receive pallet 26, and in the lowered state, pallet 2
6 is positioned and fixed on the machine table 10, and as shown by the solid line in FIG.
from the engaging portion 32a of the swing arm 32,
The pallet 26 is movable together with the machine table 10. The swing arm 32 is fixed to the upper end of a vertical swing shaft 31 supported by a support tube 30 fixed on the support plate 16, and has a rack 34 that is reciprocated by a cylinder device (not shown).
The engaging portions 32a, 32a formed at opposite ends rotate reciprocally within a range of 180 degrees via a pinion 33 integrally provided at the lower end of the rotating shaft 31.
First, the engagement blocks 71, 71 of the pallets 26, 26 on the support rail 20 and clamp rail 21 are engaged to exchange the positions of both pallets 26, 26.

A fixed shaft 40 is vertically installed on the support plate 16, and a rotating table 4 is attached to the fixed shaft 40.
1 is rotatably fitted and received by a bearing 42 on the support plate 16. As shown in FIG. 3, lifting cylinders 43 are formed at two locations on the rotating table 41 with a fixed shaft 40 in between, and pistons 44 are fitted into these cylinders 43 so as to be slidable in a direction parallel to the fixed shaft 40. has been done. Piston 44
The rod 45, which is engaged with
is fixed.

Further, a knock pin 47 is fixed on the turning table 41 and removably engages with the engagement hole 26a of the pallet 26 supported by the support rail 20.
This knock pin 47 is engaged with and disengaged from the engagement hole 26a of the pallet 26 as the support rail 20 is raised and lowered by the lifting cylinder 43. Also, the support plate 16
A positioning cylinder 48 is fixed to the positioning cylinder 48, and an engagement pin 50 that removably engages with an engagement hole 41a formed on the lower surface of the turning table 41 is connected to a piston rod 49 of the positioning cylinder 48. As an example, the engagement holes 41a are arranged at four equal angles on the circumference.
With this, the rotating table 41 is
It allows positioning in 90° increments.

Next, the operation in the above configuration will be explained.

When the machining of the workpiece on the machine table 10 is completed, the machine table 10 is positioned at a fixed position for pallet exchange, and then the clamp rail 21 is raised to unclamp the pallet 26 and its engagement block is unclamped. 71 is engaged with one engagement portion 32a of the swing arm 32. At the same time, at the loading position, the support rail 20 is raised by the lifting cylinder 43, and the pallet 26 on the support rail 20 is lifted by a certain amount and disengaged from the knock pin 47, and the engagement block 71 is moved to the pivot arm 32. is engaged with the other engaging portion 32a. By positioning the machine table 10 and raising the clamp rail 21 and support rail 20, the swing arm 32
A circular orbit of the same height centered at is constructed.

Subsequently, the pivoting arm 32 is pivoted to simultaneously exchange the pallet 26 on the clamp rail 21 with the processed workpiece placed thereon and the pallet 26 on the support rail 20 with the unprocessed workpiece placed on it.
Next, the clamp rail 21 is lowered and the pallet 26 is positioned and clamped on the machine table 10, and the engagement block 71 is disengaged from the engagement portion 32a of the swing arm 32, and in this state, the machine table 10 is moved for processing. will be moved. In parallel with this, the support rail 20 is connected to the lifting cylinder 43.
As a result, the engaging block 71 is disengaged from the engaging portion 32a of the rotating arm 32, and the pallet 26 is engaged with the knock pin 47 and positioned on the rotating table 41. In this state, the processed workpiece is removed from the pallet 26, and a new unprocessed workpiece is mounted.

At this time, the pallet 2 is placed in an angular position that makes it easy to attach and detach the workpieces on the pallet 26 relative to the worker's position.
When rotating the engagement pin 5, operate the positioning cylinder 48 by operating the push button switch.
0 from the engagement hole 41a of the rotation table 41, rotate the rotation table 41 in this state, and position the rotation table 41 again at a predetermined angular position using the engagement pin 50. After the attachment and detachment of the workpiece is completed, the support rail 20 is positioned at its original angular position.

In addition to using the cylinder 43 described above, the engagement pin 50 for positioning the turning table 41 may be operated by operating a foot pedal or a manual lever via a link mechanism or the like.

<Effects of the Invention> As described above, in the present invention, a support rail that slidably supports a pallet is provided on a revolving table provided at a loading position so that it can be raised and lowered, and the pallet on the support rail is moved up and down by raising and lowering the support rail. At the same time as the swivel arm is engaged and disengaged, the dowel pin on the swivel table is also engaged and disengaged.
The separation of the pallet from the swivel arm and the connection of the pallet to the swivel table, which are necessary to swivel the swivel table, can be performed by a single actuating device, and the loading position allows for easy loading and unloading of workpieces. This has the effect of simplifying the pallet rotation structure.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a sectional view showing a pallet exchange device, FIG. 2 is a plan view thereof, and FIG. 3 is a sectional view taken along the line -- in FIG. 10...Machine table, 15...Support frame, 20...Support rail, 21...Clamp rail, 26...Pallet, 32...Swivel arm, 4
1... Turning table, 43... Lifting cylinder, 4
7... Knock pin, 48... Positioning cylinder.

Claims (1)

[Claims] 1. In a pallet exchange device that exchanges pallets between a machine table and a loading position using a rotating arm, a rotating table is rotatably provided at the loading position, and a support rail that slidably supports the pallet is provided on the rotating table. A knock pin is provided to releasably engage the pallet supported on the support rail, and the support rail is attached to the rotating table, and the pallet supported on the support rail is attached to the rotating arm. A pallet exchange device comprising a lifting means for engaging and disengaging and raising and lowering a predetermined amount so that the dowel pin is engaged and disengaged, and a positioning means for positioning the rotary table at a predetermined angular position.