JPS6241765Y2 - - Google Patents

Description

Detailed Description of the Invention This invention relates to a braking device for a woodworking machine that selectively drives multiple functions using one electric motor and its drive shaft.

Conventional woodworking machines of this type selectively drive multiple functions, so there is no room to store a brake device, and it would be expensive to have a brake device for each function, so they did not have a brake device. . In addition, the braking device has been formed by connecting a DC braking unit to an electric motor with a braking device or a general-purpose electric machine, but it is structurally large and expensive.

The purpose of the present invention is to eliminate these drawbacks of the prior art and to provide a smaller and cheaper braking device to increase the safety of such woodworking machines, and to promote the widespread use of the braking function.

This invention has a structure in which multiple functions are selectively driven by a single output shaft by changing the belt or by connecting a key, and the drive pulley other than near the electric motor or near the motor mounting wall is used for selectively driving functions. Focusing on this point, the positional relationship and shape of the brake ring, brake piece retainer, brake piece, and motor mounting wall were devised so that the motor mounting wall was formed as one surface in order to hold the brake piece.

An embodiment of the present invention will be shown below. 1st
In Fig. 2, an electric motor 2, its drive shaft 3, and a function conversion lever 4 are installed on the electric motor mounting wall 1.
and a shift key 7 for moving a moving key 6 within the key groove of the drive shaft 3 by a ring 5, a plane pulley 8 and a plane V-belt 9 selectively driven by the moving key 6, a milling pulley 10 and a plane. belt 1
1, a pulley 12 for a circular saw, a V-belt 13 for a circular saw, a brake piece 14 in contact with the outer periphery of a brake ring 26 attached to the drive shaft 3 with a fixed key 25, and a motor mounting wall with a bolt 15. A brake piece holder 16 that is fixed to 1 and holds the brake piece 14; a spring 17 that is inside the brake piece holder 16 and applies a braking load to the brake piece 14; A solenoid 24 for separating the brake piece 14 from the ring 26, a rod 18 that connects the solenoid 24 and the brake piece 14 and slides in engagement with the brake piece holder, and a brake piece that forms a spring chamber and is a mounting member for the brake piece 14. Plate 19, locking arm 21 and rod 18, and rod 18 and brake piece 14
mounting screw 20, solenoid 24 and rod 1
A connecting member locking arm 21, a locking pin 22, a retaining ring 23, and a solenoid 24 are attached to the motor mounting wall 1 and connected to a power switch.

In the above configuration, the rotational force of the electric motor 2 is selectively transmitted to each function via the movement key 6. On the other hand, the braking ring 26 is connected to the drive shaft 3 by the fixed key 25.
It is rotated integrally with the When the power switch is turned on, the electric motor 2 rotates and at the same time the solenoid 24
pulls the locking pin 22, locking arm 21, screw 2
0, the brake piece 14 is moved against the spring 17 via the rod 18 and the brake piece plate 19 to the brake ring 2.
Pull away from 6. As a result, the drive shaft 3 of the electric motor 2
The braking force is released. Furthermore, when the power switch is cut off, the solenoid power is also cut off, the solenoid retracting force disappears, and the spring 17 causes the brake piece to
4 is pressed against the outer periphery of the braking ring 26 and applies a braking force to the drive shaft 3.

The brake piece 14 is guided into a rectangular chamber formed by the brake piece holder 16 and the motor mounting wall 1 and slides thereon. Further, the brake piece retainer 16 has an elongated mounting hole 27 for mounting with the bolt 15, thereby making it possible to adjust the braking load. The locking arm 21 is the brake piece 14
When the brake piece is worn out, the brake piece comes into contact with the retainer 16 and the screw 2
0 will not come into contact with the braking ring 26 and damage the outer periphery of the ring.

According to the present invention, the braking ring is placed close to the motor mounting wall, and the mounting wall and the brake piece retainer are integrally formed, so that the structure can selectively drive functions similar to those of this type of woodworking machine. It is possible to achieve a smaller and cheaper braking device even in the case of

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of a braking device for a combination woodworking machine according to the present invention, and FIG. 2 is a partial sectional view of FIG. 1. In the figure, 1 is the motor mounting wall, 2 is the motor,
3 is a drive shaft, 8 is a planer pulley, 10 is a milling pulley, 14 is a brake piece, 16 is a brake piece retainer, 1
7 is a spring, 19 is a brake plate, and 24 is a solenoid.

Claims (1)

[Scope of utility model registration request] In a combination woodworking machine that selectively drives multiple functions using a single electric motor and a power switching means attached to the motor drive shaft, a braking ring is installed at the base of the motor drive shaft that is mounted perpendicularly to the motor mounting wall. , the brake piece is held in a retainer on the mounting wall so that it can slide freely in the normal direction of the brake ring, and the brake piece is always pressed horizontally against the outer circumference of the brake ring using a spring, and then the power is turned on. A braking device in which a solenoid separates a braking piece from a braking ring.