JPS6260962B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a processing motor used in woodworking routers and the like.

Conventionally used machining motors have a spindle equipped with a chuck operating mechanism installed above the chuck mechanism that grips and releases the cutting tool, protrudes above the casing, and has a pulley fixedly attached.
The spindle is connected to a pulley on a motor shaft having a separately provided cooling fan. This conventional structure had the disadvantage that when the chuck mechanism was operated, a load was applied to the bearing supporting the spindle, which could damage the bearing.

The present invention was created with the aim of eliminating these drawbacks.

The illustrated embodiment will be described below.

In the figure, numeral 1 indicates a cylindrical casing,
Inside the casing 1 are installed a chuck mechanism a, a motor mechanism b, and a chuck operating mechanism c, which sequentially grip and release the cutting tool T from the bottom. In the center of the casing 1, a hollow spindle 7 is vertically installed, the lower end of which is supported by a seat 2 fixed to the casing 1 via a bearing 3, and the upper part supported by a partition 5 of the casing 1 via a bearing 6. A chuck 9 with an operating rod 8 extending upwardly is inserted into the hollow of the spindle 7 from the lower end and fitted into the tapered part 7'.
is fitted and fixed to protrude from the upper end of the spindle 7, and in the cylinder 10, between the upper end of the spindle 7 and the receiving plate 11 fixed to the upper end of the operating rod 8 protruding from the hollow part of the spindle 7. , the operating rod 8 is pulled up, the chuck 9 is fitted into the taper 7' of the spindle 7, and the leaf spring 12 is compressed in the direction of gripping the cutting tool T, thereby forming a chuck mechanism a;
Furthermore, an outer piston ring 13 that moves up and down on the inner wall of the casing 1 is disposed above the cylinder 10 fixed to the upper end of the spindle 7, and inside the outer piston ring 13,
A sensing rod 14 for sensing the chuck gripping and releasing, which penetrates the upper wall 13' and projects outside the casing 1, is provided to protrude upward.
The lower part passes through the lower wall 13'' and is connected to the receiving plate 1 of the operating rod 8.
An inner piston 16 with a protruding abutment rod 15 facing the inner piston 16 is installed inside the inner piston 16 and an upper chamber 17 between the upper wall 13' of the outer piston 13 and a lower chamber 17' between the lower wall 13''. Vent hole 18 for supplying compressed air,
18' is opened in casing 1. Further, an outer cylindrical body 19 surrounding the cylindrical body 10 that is fitted and fixed to the upper end of the spindle 7 is suspended from the lower surface of the outer piston 13, and the flange 19' at the lower edge thereof is attached to the partition wall 5.
A support plate 21 is attached that slides into the cylinder body 20 fixed on the upper surface and slides on the outer periphery of the cylinder body 10.
The outer peripheral side surface of the flange 19' provided on the outer cylinder body 19 is opposed to the lower surface of the flange 10' of the cylinder body 10 via the cylinder body 20, and the outer peripheral side surface of the flange 19' is in sliding contact with the inner peripheral side surface of the cover plate 20' of the cylinder body 20. A recessed step 19'' is provided at the lower part of the circumferential surface, and this and the lower chamber 17' of the outer piston 13 are communicated through the ventilation hole 23, so that the compressed air supplied to the lower chamber 17' is connected to the support plate 21. A gap 24 acting on the cover plate 20' is formed, and the gap is
As the support plate 21 rises, the cylindrical body 10 faces it.
When the flange 10' of the vent hole 23 comes into contact with the
The opening of the concave stepped portion 19'' is the same as that of the cylinder body 20.
A chuck operating mechanism c having a width located inside the chuck is formed, and a rotor 25 is fitted and fixed on the outer periphery of the spindle 7 between the chuck operating mechanism c and the chuck mechanism a. The stator 26 is enclosed to form a motor mechanism b, and a spiral ventilation groove 27 is formed downward in the inner wall of the casing 1 in contact with the outer periphery of the stator 26. It communicates with the air supply machine outside the machine through the supply port 5', and the lower part communicates with the motor mechanism b through the ventilation hole 28 and reaches the upper part through the openings 29, 29' of the partition body 5 and the cylinder body 20. Then, a discharge port 30 provided in the casing 1 communicates with the outside of the machine via a steel plate 31.

The present invention has the above-described configuration, and the chuck actuating mechanism c for gripping and releasing the cutting tool T has the air hole 18
Compressed air is supplied to the upper chamber 17 of the outer piston ring 13 to lower the inner piston 16, and the abutting rod 1
5 comes into contact with the receiving plate 11 fixed to the upper end of the operating rod 8, and the compressed air entering the upper chamber 17 pushes up the upper wall 13' of the outer piston 13, so the outer piston ring 13 rises and the outer piston The inner upper edge of the support plate 21 fixed to the outer cylinder 19 suspended from the ring 13 is in contact with the lower surface of the flange 10' of the cylinder 10 fixed to the upper end of the spindle 7, supporting the spindle 7. As the inner piston 16 further descends, the operating rod 8 is pushed down against the leaf spring 12, and the chuck 9 is detached from the taper 7' of the spindle 7. After fitting the cutting tool T therein, the chuck 9 is disengaged from the taper 7' of the spindle 7.
By supplying compressed air from 8' to the lower chamber 17' of the outer piston ring 13, as the inner piston 16 rises, the outer piston ring 13 also descends and the air gap is filled from the lower chamber 17' through the vent hole 23. 24
Compressed air acts on the support plate 21, and the flange 10' of the cylinder 10, the inner upper edge of the support plate 21, the receiving plate 11, and the abutment rod 15 are separated, and the leaf spring 12
The operating rod 8 is pulled up, and the chuck 9 fits into the taper 7' of the spindle 7, gripping the cutting tool T, and the motor mechanism b disposed on the spindle 7 between the chuck mechanism a and the chuck operating mechanism c As a result, the spindle 7 is rotated, the cutting tool T performs the desired processing, and air is circulated through the spiral ventilation groove 27 circumscribing the stator 26 through the air supply port 5' from the air supply device outside the machine. The cooling air passage for motor b extends downward from the air vent 28, passes through the gap between the stator 26 and the rotary 25, and reaches the upper discharge port 30. Then, the operating rod 8 is pushed down to grasp and release the cutting tool. Therefore, when the cutting tool is gripped and released, no load is applied to the bearings that support the spindle, and damage to the bearings can be prevented. This particularly improves the durability of high-frequency motors and when cutting workpieces with high-speed rotating tools. It is also possible to address accuracy and performance issues such as:

[Brief explanation of the drawing]

The figure is a longitudinal sectional side view showing an embodiment of a processing motor according to the present invention. 1... Casing, 7... Hollow spindle, 8
...Operating rod, a...Chuck mechanism, b...Motor mechanism, c...Chuck operating mechanism, T...Cutting tool, 12...Leaf spring, 13...Outer piston, 1
6...Inner piston, 15...Butting rod, 10'...
...Flange, 21...Base plate.

Claims (1)

[Claims] 1. A chuck mechanism for gripping and releasing a cutting tool is provided at the lower end of a cylindrical casing, and a motor mechanism and a chuck operating mechanism are sequentially installed above the chuck mechanism and housed in the casing, and the chuck mechanism has a bearing in the center of the casing. The chuck operating mechanism consists of an operating rod, a chuck for gripping and releasing the cutting tool by moving the operating rod back and forth, and a leaf spring compressed between the upper end of the hollow spindle and the upper end of the operating rod. is arranged on the motor mechanism provided on the outer periphery of the hollow spindle, including an outer piston that moves up and down the inner wall of the casing using compressed air, and an inner piston that is housed within the outer piston and moves up and down opposite to the up and down movement of the outer piston. The inner piston is provided with a protruding abutment rod that presses down the upper end of the operating rod against the leaf spring when the inner piston is lowered, and the lower surface of the outer piston that rises as the inner piston is pressed downward is provided with a protruding rod that presses down the upper end of the operating rod when the inner piston is lowered. A processing motor is provided with a support plate that supports a flange disposed on the circumferential side of the upper end of the hollow spindle.