JPH0126871Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a reduction gear device for a roll blind.

The inventor of the present application previously proposed a device (Utility Model Application No. 165188/1988) that reduces the screen winding speed of a spring built into a roll blind. The device connects the input shaft of a planetary gear mechanism to the fixed shaft of the roll blind via a single brake, fixes a planetary gear support arm to the input shaft, and allows multiple planetary gears to freely rotate on the planetary gear support arm. A ring gear that meshes with each planetary gear is installed integrally with the roll pipe of the roll blind, and an output shaft is integrally formed with the sun gear that also meshes with and is supported by each planetary gear and protrudes on the opposite side from the input shaft.
An arm was attached to the output shaft, and the arm supported the brake shoe so that it could move forward and backward in the radial direction, and a brake shoe drum that frictionally engaged with the brake shoe was provided integrally with the roll pipe. A one-sided brake does not brake the rotation of the input shaft, that is, the planetary gear support arm, in the screen lowering direction, but
It is set to prevent rotation in the opposite screen winding direction. Therefore, when lowering the screen, the output shaft or brake shoe rotates together with the roll pipe, so the centrifugal force is small and there is almost no deceleration effect due to frictional contact with the brake shoe drum, but when the screen is lowered, the brake shoe rotates faster than the roll pipe. Since it rotates in reverse at a high speed, the centrifugal force is large and the deceleration effect due to frictional contact with the brake shoe drum is also very strong. However, since the brake show drum was provided integrally with the roll pipe, there was a problem in that the vibrations of the planetary gear mechanism were directly transmitted to the roll pipe, resulting in large noise.

An object of the present invention is to solve the above-mentioned problems by providing a reduction gear for a roll blind equipped with a planetary gear mechanism, which produces less noise.

In order to achieve the above-mentioned problems, the feature of the device of the present invention is that a gear mount integrated with the roll pipe is connected to one end face of the ring gear of the planetary gear mechanism via a vibration isolating material, and a gear mount integrated with the roll pipe is connected to the other end face via a vibration isolating material. The purpose is to connect the governor case that engages with the brake shoe to prevent the vibrations of the planetary gear from being directly transmitted to the roll pipe.

The device of the present invention will be explained based on the embodiments shown in the drawings. As shown in FIG. 1, an end block 2 is fixed to one end of a roll pipe 1, and a round shaft 3 is implanted in the block. The round shaft 3 is rotatably supported by a bracket (not shown). A clutch case 4 is fitted to the other end of the roll pipe 1, and the clutch case is rotatably fitted to a fixed shaft 7 via a bearing receiver 5 and a bearing ball 6. A spring core 9 is fixed to the tip of the fixed shaft 7 with a rivet 8, and a spring mount 25 is fixed to the spring core with a rivet 10. Cover the spring core with cover 11, and
2 to determine the position. Both ends of the spring 13 are locked to the clutch case 4 and spring mount 25, respectively.

The gear mount 14 is loosely fitted into the spring mount 25 which is the extended end of the fixed shaft 7 so as not to slide in the axial direction, and the outer peripheral groove of the gear mount is fitted into the inner peripheral protrusion of the roll pipe 1. is rotated together with roll pipe 1. A ring gear 16 is fixed to a seat of a gear mount 14 via a vibration-proof rubber plate 15. The brake spring 17 is loosely fitted into the spring mount 25, and the locking end 18 of the brake spring is hung on the spring mount 25. A brake drum 19 is tightly and releasably fitted to the brake spring 17, and an input shaft 27 of a planetary gear mechanism is inserted into the shaft hole of the brake drum and coupled together.
A governor cup 20 is screwed to the back surface of the ring gear 16 via a vibration-proof rubber plate 21. Ring gear 1
An arm 23 is fixed to an output shaft 22 protruding from the center of the shaft 6, and a governor weight 24 is swingably attached to the arm with a rivet 37. A brake shoe 26 is attached to the governor weight 24, and the brake shoe 26 is brought into frictional contact with the brake shoe drum on the inner periphery of the governor cup 20 to reduce the rotation of the roll pipe 1 when the screen is rolled up. Although not shown, the input shaft 2 is located inside the ring gear 16.
A sun gear is fixed to 7, a plurality of planetary gears are interposed between the sun gear and a ring gear on the inner periphery of a ring gear 16, and the planetary gears are rotatably attached to a planetary gear support arm integral with the input shaft.

The brake spring 18 relaxes when the brake drum 19 rotates in the screen withdrawal direction. However, when the screen is about to rotate in the winding direction, the brake spring 18
Tighten to 9. At this time, since the ring gear of the screen rotates together with the roll pipe, the output shaft 22 rotates in the opposite direction at high speed.

As shown in FIGS. 2 and 3, the gear mount 14 has a ring portion 3 that fits into the spring mount.
A peripheral wall portion 31 that extends radially in three directions from 0 and extends in the axial direction, and a flange portion 32 that forms the rear end surface of the peripheral wall portion 31.
Consisting of A set screw is passed through the screw hole of the flange portion 32, and the gear mount 14 is fixed to the front surface of the ring gear via the vibration-proof rubber plate.

As shown in FIG. 4, a crescent-shaped governor weight 24 is riveted to the top and bottom of the arm 23 so as to be swingable, and a brake unit 24 is provided on the outer periphery of the governor weight 24. When the output shaft 22 rotates, the governor weight 24 opens due to centrifugal force, and the brake shoe 26 frictionally engages with the inner peripheral surface of the governor cup 20.

As shown in FIGS. 5 and 6, the ring gear 1
The output shaft 22 protruding from the back surface of the output shaft 6 has a notched circular cross section, and a groove 34 is provided on the circumferential side of the tip thereof. As shown in FIG. 7, a part of the cross section of the shaft hole 35 of the arm 23, which is made of a highly elastic synthetic resin molded product, is also formed into a notched circular shape so as to be integrally engaged with the output shaft 22. As shown in FIGS. 4 and 7, the inner circumferential wall of the shaft hole 35 is extended into a bifurcated shape, and the distal end thereof is bent inward in the radial direction to form a hook 36. As shown in FIG.
4 to prevent the arm 23 from coming off. Therefore, there is no need to separately attach a snap spring or the like to prevent the arm 23 from coming off.

As mentioned above, the device of the present invention inserts a vibration-proof rubber plate between the governor cup and the ring gear that frictionally engages with the brake shoe, and between the ring gear and the gear mount. Almost no vibrations from the governor cup or ring gear are transmitted. Therefore, there is little risk that the roll pipe will resonate with the governor cup or ring gear and generate noise.

In addition, since the position of the governor arm on the output shaft is fixed by a forked hook protruding from around the shaft hole, even if the brake shoe and governor hook engage frictionally, vibrations due to rattling of the output shaft will be avoided. There is no fear of

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a roll blind equipped with a speed reducer according to an embodiment of the present invention, Figs. 2 and 3 are sectional views and side views of the gear mount of Fig. 1, and Fig. 4
5 is a rear view of the governor shown in FIG. 1, FIG. 5 is a view showing the output shaft, FIG. 6 is a sectional view taken along the - line in FIG. 5, and FIG. 7 is a sectional view of the arm. 1... Roll pipe, 7... Fixed shaft, 14...
Gear mount, 15... Anti-vibration rubber plate, 16... Ring gear, 17... Brake spring, 19... Brake drum, 20... Governor cup, 21... Anti-vibration rubber plate, 22... Output shaft, 23... Arm, 2
6...Brake shoe, 27...Input shaft.

Claims (1)

[Claims for Utility Model Registration] 1. An input shaft connected to the fixed shaft of the roll blind via a one-sided brake that does not brake the rotation in the screen lowering direction but brakes the rotation in the screen winding direction, and the roll pipe of the roll blind. a ring gear fitted therein so as to rotate integrally with the input shaft; a planetary gear support arm fixed to the input shaft; a plurality of planetary gears rotatably attached to the planetary gear support arm and meshing with the ring gear; a sun gear meshing with the planetary gears at the center; an output shaft integrally formed with the sun gear and protruding to the opposite side of the input shaft; an arm integrally attached to the output shaft; A device comprising a brake shoe held movably forward and backward, and a brake drum fitted into the roll pipe so as to rotate integrally with the roll pipe, wherein a cylindrical gear mount is provided between the roll pipe and the fixed shaft. The gear mount is attached to rotate together with the roll pipe but not to slide in the axial direction, the gear mount is fixed to the input shaft side end surface of the ring gear via a vibration isolating material, and the gear mount is fixed to the output shaft side end surface of the ring gear. 1. A speed reduction device for a roll blind, characterized in that a governor cup is fixed between the shaft holes through a vibration isolating material, and the inner circumferential surface of the governor cup is formed into a brake shoe drum. 2 Shaft holes in the output shaft and arm are formed in a notched circular shape so that they fit together, a circumferential groove is provided on the arcuate side of the portion of the output shaft that protrudes from the arm, and the arcuate side of the shaft hole is bifurcated. A roll blind according to claim 1, characterized in that the arm is protruded in the axial direction and has a hook formed at its tip, and the hook is fitted into the circumferential groove to fix the position of the arm. reduction gear.