JPS59335B2 - Katsu changing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for changing a cutter, which is a tool in a machine tool, and is particularly aimed at making it possible to quickly and easily change a large, heavy cutter.

In a vertical milling wall, it requires considerable effort for the operator to directly lift and lower the cutter in order to attach and replace the large, heavy milling cutter (hereinafter referred to as the cutter) to the spindle. Due to the dangers involved in bolt tightening work, there are devices that perform mechanical work.

A typical device is one in which a cutter is placed on the swing arm outside the spindle axis by a swing arm that can freely rotate on an axis parallel to the spindle, and the swing arm is rotated on the spindle axis to move up and down.

In this conventional device, the mechanism for raising and lowering the swing arm is a feeding operation using a screw shaft or a crane, and the raising and lowering operation requires a considerable amount of time and lacks promptness.
It also has the disadvantage of requiring separate equipment such as a crane.

Furthermore, in conventional devices, the swing arm supports the lower or middle part of the cutter.
There are also drawbacks such as the swing arm supporting the cutter interfering with the work when tightening and removing bolts when attaching and detaching the cutter to the spindle, making it difficult to perform the work easily.

The present invention aims to provide a cutter changing device that eliminates the above-mentioned problems.The feature is that the tension of the spring is changed stepwise to raise and lower the swing arm that supports the cutter, thereby allowing quick raising and lowering. In addition, the swing arm supports a flange provided on the outer periphery of the cutter, and bolts can be tightened from the bottom of the cutter to facilitate removal.

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, 1 is a processing head, 2 is a spindle with a vertical axis supported on the processing head 1 so as to be rotatable around the vertical axis, and 11 is a spindle fixed to the spindle 2. A cutter 13, which will be described later, is attached to and detached from the adapter using a tightening bolt 15.

Reference numeral 3 denotes a support body fixed to the side surface of the processing head 1, and a support shaft 4 is vertically supported on this support body along an axis parallel to the spindle 2 so as to be vertically movable up and down.

A rack sleeve 5 having a rack 5a is fitted into the support body 3 so as to be slidable relative to the support shaft 4.

A coil spring 6 concentric with the support shaft 4 is installed inside the rack sleeve 5, and the lower end of the coil spring 6 is connected to a needle bearing 2.
5 to the lower inner surface of the rack sleeve 5, and its upper end abuts to a ring 24 screwed onto the support shaft 24.

The rack 5a of the rack sleeve 5 is engaged with a pinion 8 formed on a rotation shaft 16 rotatably supported on the support body 3 perpendicular to the axis of the support shaft 4.
is moved up and down, and the spring force of the coil spring 6 is changed according to the state of the cutter replacement.

7 is a balance weight attached to the upper end of the support shaft 4.

The swing arm 9 has a bearing 26 at the lower end of the support shaft 4.
It is installed so that it can be rotated horizontally.

This swing arm 9 has a two-fork shape, and has engaging pawls 10 protruding from three locations on the inside.

Reference numeral 13 denotes a cutter, and the cutter has a collar portion 14 on its outer periphery with which the engaging claw 10 of the swing arm 9 engages.

This cutter 13 is attached to the spindle adapter 11 with the centering shaft 12.
It is then centered and fixed by tightening bolts 15.

On the other hand, an operating lever 17 is fixed to the end of the rotating shaft 16 having the pinion 8.

The operating lever 17 is provided with a knock pin 18 that is pressed by a spring 19.

This knock pin 18 has notched holes 2 recessed in several locations around the outer circumference of the index plate 20 centered on the rotation axis 16.
1 is removably engaged.

The index plate 20 is fixed to the support 3.

In the figure, reference numeral 22 indicates a stopper for positioning the swing end of the swing arm 9 directly below the spindle, and reference numeral 23 indicates a stopper for positioning the rising end of the swing arm 9 during cutting.

Next, the operation of the apparatus of the present invention having the above configuration will be explained.

The swing arm 9 is rotated to a position outside the axis of the spindle 2, and the operating lever 17 is kept in the position shown in FIG. 4A when replacing the cutter.

At position A when the cutter is replaced, the rack sleeve 5 is at its lowest position, and the spring force of the coil spring 6 is at its weakest setting.

When the cutter 13 is placed on the swing arm 9, the engaging claw 1
0 engages with the flange 14, the weight of the cutter 13 compresses the coil spring 6, and the swing arm 9 descends to a position where it does not interfere with the spindle adapter 11.

In this state, the swing arm 9 is rotated until it abuts against the stopper 22, and the cutter 13 is positioned directly below the spindle adapter 11.

At this position, the operating lever 17 is rotated to the cutter mounting position shown in FIG. 4B.

As a result, the pinion 8 raises the rack sleeve 5 by an amount corresponding to the rotation angle of the operating lever 17, thereby increasing the spring force of the coil spring 6.

The strengthened spring force is applied to the support shaft 4 via the ring 24.
The swing arm 9 is raised to a position where the cutter 13 is close to the spindle adapter 11 and balanced.

In this state, the cutter 13 can be lifted up to the spindle adapter 11 with a slight force.

At this point, the spindle 2 and the cutter 13 are aligned in phase, and the cutter 13 is attached to the spindle adapter 1 using the tightening bolt 15.
Tighten and fix at 1.

As a result, the flange 14 on the outer periphery of the cutter 13 is attached to the stopper 2.
The swing arm 9 is separated from the engagement claw 10 of the swing arm 9 which is in contact with the swing arm 3, and a clearance is created between the two.

Furthermore, after the cutter is attached, the operating lever 17 is rotated to the cutting position shown in FIG. 4C, so that the spring force of the coil spring 6 is maximized.

Therefore, the contact force of the swing arm 9 to the stopper 23 is strengthened, and a clearance is maintained between the engaging claw 10 and the flange 14 on the outer periphery of the cutter 13, and the cutter 13 is firmly held in a fixed position, so that the swing arm 9 is not oscillated during cutting. It prevents you from moving.

Note that the cutter 1 attached to the spindle adapter 11
Removal of item 3 is performed by reversing the above procedure.

Further, in the embodiment, the spring force of the coil spring 6 is changed in three stages, but the purpose can be achieved even with two stages.

As described above, in the apparatus of the present invention, the swing arm that moves the cutter up and down uses a coil spring to gradually change the strength of the spring force based on the weight of the cutter.
Moreover, since this is done by rotating the operating lever, the cutter can be moved up and down quickly, and the swing arm of the cutter is supported by a fork-shaped swing arm attached to the collar provided on the outer periphery of the cutter. Since the cutter is operated by an engaging pawl provided on the cutter, the lower surface of the cutter is in an open state, and the tightening bolt has the advantage of being easily operated without any interference.

[Brief explanation of the drawing]

Fig. 1 is a sectional front view of the device of the present invention, Fig. 2 is a view taken in the direction of the ■ arrow in Fig. 1, Fig. 3 is a sectional view taken along the line 1-1 in Fig. 1, and Fig. 4 is a front view of the operation bundle portion. . DESCRIPTION OF SYMBOLS 1... Processing head, 2... Spindle, 3... Support body, 4... Support shaft, 5...
... Rack sleeve, 6 ... Coil spring, 8 ... Pinion, 9 ... Swing arm, 10 ... Engagement pawl, 13.・・・・・・
・Cutter, 14... Flange, 15... Tightening bolt, 17... Operation bundle, 18...
... Dowel pin, 20 ... Index plate, 21 ... Notch hole.

Claims (1)

[Claims] 1. A support shaft supported by a spring whose spring force can be switched in stages by rotating an operating bundle is provided in parallel with a spindle that can be rotated around a vertical axis,
A cutter changing device in which a swing arm is horizontally pivotably attached to the lower end of the support shaft, the swing arm having an engaging pawl that engages with a flange provided on the outer periphery of the cutter holder to support the cutter.