JPS5829307Y2 - Speed governor in shutter opening/closing machine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a speed governor in a shutter opening/closing machine that smoothly adjusts the lowering speed of the shutter.

Conventionally, the first speed governor device that replaces the shutter opening/closing machine is
The one shown in the figure is known.

To explain what is shown in FIG. 1, the speed governor A is:
One end of the brake piece C that acts on the inner circumferential surface of the brake wheel B is pivotally connected to the rotating ring by a pin E that is hung vertically, and is rotatable by the centrifugal force generated by the rotation of the rotating ring. The movable end C' is brought into contact with a pin F hanging from a rotating wheel, and a tension spring G is hooked to the opposing brake piece C.

In the case of this speed governor A, as the shutter descends under its own weight, the rotational speed of the rotary ring increases, and the brake pieces C rotate about the pin E as a fulcrum due to the centrifugal force of rotation, and the inner circumference of the brake wheel B. It acts on the surface to generate braking force and works to reduce the rotational speed of the rotating wheel.

However, in this case, the brake piece C acts on the inner circumferential surface of the brake wheel B only on one side determined by the rotation direction, so the value of the braking force is small, making it difficult to adjust the speed smoothly and increasing the braking force. However, since the contact surface of the brake piece C needs to be made larger, the brake piece C becomes stiffer and the entire shutter opening/closing machine becomes larger.

When the shutter opening/closing device was pressed, the rotational direction of the button remained constant, so the brake piece C wore out on one side, resulting in a short service life of the brake piece C.

Since the rotating wheel rotates with the brake piece C biased to one side, the unbalanced center of gravity generates vibrations, which has the disadvantage of causing noise from the shutter.

In addition, as another speed governor, There is one disclosed in Japanese Patent No. 4818.

This is a speed governor equipped with two brake pieces that are pressed against the inner circumferential surface of a brake cylinder by centrifugal force, and unlike the one shown in FIG. (restricted ends) are not provided so that they are close to each other and face each other, and -
The pivot portion (restricted end) of the brake piece on one side and the movable end of the brake piece on the other side are provided so as to be close to each other.

As described above, in the conventional system, there is a difference in the braking force generated when the drum to which the brake piece is attached rotates clockwise and when the drum rotates counterclockwise because the conditions for acting as a brake are different. , and sufficient braking force cannot be obtained by rotating in the opposite direction to the specified rotation direction.

The shutter opening/closing device may be attached to the right end of the shutter winding shaft or to the left shaft end of the shutter winding shaft, and the direction of rotation of the shutter opening/closing device is determined by the position of attachment to the shutter winding shaft.

The speed governor with the above structure can only handle rotation in one direction, and two types of shutter opening/closing devices must be prepared depending on the mounting position.

Therefore, an increase in cost is unavoidable, and if the installation of the shutter opening/closing device requires changing its position, it takes time and effort, such as ordering a model with a different rotation direction, which leads to a decrease in work efficiency.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks, to provide a speed regulating device that can obtain the same speed regulating effect regardless of the rotational direction of the shutter winding shaft, and can immediately respond to changes in the rotational direction.

The basic structure of the present invention is that a brake wheel having a circular hollow part is installed in an opening/closing machine, a rotating shaft whose axis is aligned with the circular hollow part is provided in the circular hollow part of the brake wheel, and a disc is attached to the rotating shaft. A rotating ring of a shape is fitted onto the outside and fixed, and a pin is provided protruding from one end face of the rotating ring with a rotating shaft sandwiched therebetween at a predetermined interval, and whose axis is parallel to the rotating shaft, and the braking action is performed by A semi-circular arc shape corresponding to the circumferential surface of the pin is attached to each end of two arcuate brake pieces, the outer circumferential surface of which is a circular curved surface corresponding to the inner circumferential surface of the circular hollow part of the brake wheel. A semi-concave ring is provided, and the circular curved surface of the outer circumference of the two brake pieces faces outward.
The brake pieces are made to face each other, and the semi-concave rings at both ends of the two brake pieces are provided so as to be able to freely approach and separate from the circumferential surface of the pin, and a common tension spring is hooked to each end of the two brake pieces. This is what happens.

The brake piece rotates due to the centrifugal force that accompanies the rotation of the rotating wheel, and the brake piece acts to press against the inner circumferential surface of the brake wheel to generate a braking force and slow down the rotation of the rotating wheel.

In this speed governor, both ends of the brake piece are not restrained and are only pressed against the pin, so the brake piece rotates in accordance with the rotational direction of the rotating wheel.

Therefore, it is possible to cope with the case where the rotating wheel rotates in any direction, and the same speed regulating effect can be obtained.

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

In FIGS. 2 and 3, a brake wheel 4 having a circular hollow part is provided in series with the electric motor 2 of the shutter opening/closing machine 1,
The rotating shaft 3 of the electric motor 2 is extended and supported at the axis of the circular hollow part of the brake wheel 4.

A disc-shaped rotating ring 5 is fitted onto the rotating shaft 3 and fixed thereto, so that the rotating shaft 3 and the rotating ring 5 rotate together.

A pin 6 is provided on one end face of the rotating ring 5 at two positions opposite to the rotating shaft 3 so as to sandwich the rotating shaft 3 therebetween, and protrudingly parallel to the axis of the rotating shaft 3.

An arcuate 2 whose outer circumferential surface serving as a brake action surface is formed into a circularly curved surface corresponding to the inner circumferential surface of the circular hollow part of the brake wheel 4.
The brake pieces I, 7' have semi-concave rings 8, 8' formed in semi-circular arcs corresponding to the pins 6 at both ends thereof.

The two brake pieces 7, 7' are housed in the brake wheel 4 so that the braking surface faces the inner circumferential surface of the brake wheel 4, and the semi-concave rings 8, 8' abut the pin 6 so as to be able to move toward and away from the pin 6. being touched.

The pin 6 connects the half-quad wheels 8, 8' of the two brake pieces 7, 7'.
The brake pieces I and 7 will be held in place from both sides.
A gap of a predetermined width is formed between the end surfaces 9 of both brake pieces I.

The end faces of 7' are never in equal contact.

A tension spring 10 is hooked to each end of the two brake pieces I, 1' so that the two brake pieces I, 7' attract each other.

To explain the operation of the above embodiment, as shown in FIG. 4, when the rotating shaft 3 rotates in the P direction and the rotational speed exceeds a set value, both ends of the brake pieces 7 and 7' become movable ends. Therefore, in accordance with the direction of rotation, the left brake piece T rotates with the semi-concave ring 8 at the upper end in contact with the upper pin 6, and the right brake piece T' rotates by contacting the semi-concave ring 8 at the lower end with the lower semi-concave ring 8'. It contacts pin 6VC and rotates in the outer circumferential direction.

The two brake pieces 7, 7' each act on the inner circumferential surface of the brake wheel 4 to generate a braking force and reduce the rotational speed of the rotating shaft 30 so that the rotational speed of the rotating shaft 30 does not rise above a set value. to work.

When the rotational speed falls below the set value, the two brake pieces I and 7' are pulled inward by the elasticity of the tension spring 10, so that they no longer come into contact with the inner circumferential surface of the brake wheel 4, and no braking force is generated. It disappears.

By repeating such operations alternately, the rotational speed is kept approximately constant.

Since the present invention has the above configuration, it has the following advantages.

(1) Since the ends of the brake pieces are not restrained by pins, the brake pieces generate a constant braking force regardless of the direction of rotation of the rotating wheel.

Therefore, the same speed regulating effect can be obtained whether the shutter is attached to the right end or the left end of the shutter winding shaft.

(2) Since the same regulating effect can be obtained regardless of the direction of rotation, changes in the direction of rotation can be responded to immediately, and installation leads to improved work efficiency.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a conventional speed governor, Figure 2 is a partial sectional view of a shutter opening/closing machine equipped with the speed governor of the present invention, and Figure 3
The figure is a cross-sectional view of the tooth taken along the line X--X in FIG. 2, and FIG. 4 is an explanatory diagram of the action of FIG. 3. Explanation of symbols of main parts, 3...Rotation axis, 4...
... Brake wheel, 5 ... Rotating wheel, 6 ...
...Hi:/, 7.7'...Brake piece, 8.
8'...Semi-concave ring, 10...Tension spring.

Claims (1)

[Scope of utility model registration request] In a shutter opening/closing machine that raises and lowers a shutter, a brake wheel 4 having a circular hollow part is provided, and a rotating shaft 3 whose axis is aligned with the circular hollow part is provided in the circular hollow part of the brake wheel 4, and the rotation thereof is A disk-shaped rotating ring 5 is fitted and fixed onto the shaft 3, and the rotating shaft 3 is attached to one end surface of the rotating ring 5.
Pins 6 are protruded from each other at two locations at a predetermined interval, and whose axis is parallel to the rotating shaft 3, so that the outer circumferential surface that becomes the braking surface is on the inner circumferential surface of the circular hollow part of the brake wheel 4. Semi-concave rings 8, 8' having semi-circular arcs corresponding to the circumferential surface of the pin 6 are provided at both ends of each of two arcuate brake pieces I, 7' formed on corresponding circular curved surfaces, The two brake pieces 7,
7' are opposed to each other, and semi-concave rings 8, 8' at both ends of the two brake pieces 7, 7' are provided so as to be able to freely approach and separate from the circumferential surface of the pin 60, and the ends of the two brake pieces 7, 7' A speed governor in a shutter opening/closing machine in which a common tension spring 10 is attached to each section.