JP2015075138A - Speed reducer with brake and blind device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new speed reducer with a brake capable of surely transmitting a force of a motor shaft and capable of exerting a sufficient brake force, and a blind device using th same.SOLUTION: A speed reducer with a brake includes: a rotary top 21 for performing normal/reverse rotation together with an output shaft 11 of a motor 10; a case adaptor 22 located so as to surround the rotary top 21; a transmission top 24 for rotating with the rotary top 21 and transmitting the rotation to the speed reducer; and a brake spring 23 for expanding the diameter when the transmission top 24 side rotates by input from the speed reducer 30 and coming into press-contact with an inner wall of the case adaptor 22. The brake spring 23 has: an annular plate spring body 23a extending along the inner wall of the case adaptor 22; and an engaging claw 23b provided at an end part of the plate spring body 23a and engaged with the transmission top 24. Thereby, the force of the motor shaft 11 can be transmitted surely and a sufficient brake force can be exerted.

Description

  The present invention relates to a brake-equipped reduction device capable of transmitting an output from a motor to the outside and restricting an input to the motor from the outside, and a blind device using the same.

In general, a blind installed at a window, a shutter of a store, a projection screen, and the like are provided with a winding device for moving the screen up and down. Many of these winding devices are manually operated as well as those driven by a motor as a drive source, and the configuration is reduced by reducing the number of revolutions of the electric motor as a drive source and its output shaft. In general, a motor equipped with a speed reducer for obtaining a winding torque and a brake mechanism for preventing the weight of the shielding material from falling.

  For example, in Patent Document 1 below, a forward / reverse motor and a planetary gear speed reduction mechanism for reducing the motor output are provided inside a cylindrical winding shaft, and the motor is controlled to perform forward / reverse drive control. A screen winder that moves the screen up and down is disclosed.

  Patent Document 2 below discloses a blind in which a rotating shaft provided with a winding pipe is provided with a brake device having a DC motor to prevent the shield material from falling under its own weight. Patent Document 3 below discloses an electric shutter driving device in which a clutch mechanism is connected to an output shaft of an electric motor via a speed reduction mechanism.

JP-A-60-138196 JP 2000-186477 A JP 2002-256785 A

  By the way, the brake mechanism used in the above-described conventional winding device or the like uses a coiled spring as shown in, for example, Patent Document 3, and expands and contracts this to use the friction force to apply the brake. It comes to control. However, with a coiled spring, it is difficult to reliably transmit the force of the input shaft and the output shaft, and it is difficult to exert a sufficient braking force. Further, since the end of the linear coil is engaged or locked with the input shaft, the output shaft, or the like, the engagement or locking of the tip is easily released, and the reliability is poor. .

  Therefore, the present invention has been devised to solve these problems, and its purpose is to reliably transmit and output the force of the motor shaft and to provide a sufficient braking force for external input. It is intended to provide a novel brake device with a brake capable of exhibiting the above and a blind device using the same.

  In order to solve the above-mentioned problem, a first invention provides a motor capable of forward and reverse rotation, a speed reducer for reducing the output rotational speed of the motor, and an output from the motor provided between the motor and the speed reducer. And a brake part having a brake part that can restrict an input from the reducer to the motor, and the brake part includes a rotating piece that rotates forward and backward together with the output shaft of the motor. A case adapter positioned so as to surround the rotating piece, a transmission piece that is housed in the case adapter and rotates together with the rotating piece and transmits the rotation of the rotating piece to the speed reducer, and the case adapter Provided along the inner wall, the diameter of the transmission piece is increased when the transmission piece side is rotated by the input from the speed reducer and is pressed against the inner wall of the case adapter. A brake spring, and the brake spring includes an annular leaf spring body extending along the inner wall of the case adapter, and an engagement claw provided at an end of the leaf spring body and engaged with the transmission piece. It is the deceleration device with a brake characterized by these.

  According to such a configuration, since the brake spring is made of a leaf spring having a predetermined width, the contact area with the transmission piece and the rotation piece is widened, and the force can be reliably transmitted. Moreover, the contact area with respect to a case adapter inner wall can be taken large. As a result, the force of the motor shaft can be reliably transmitted and output, and a sufficient braking force can be exerted against external input.

  According to a second aspect of the present invention, the engagement pawl is formed by bending an end portion of the leaf spring body inward. According to such a configuration, it is possible to easily form the engaging claw integrally by simply bending the end portion of the belt spring.

  A third invention is provided between a motor capable of forward and reverse rotation, a speed reducer that decelerates the output rotational speed of the motor, and the motor and the speed reducer, and transmits an output from the motor to the speed reducer. And a brake-equipped reduction device that can restrict an input from the speed reducer to the motor, wherein the brake portion surrounds the rotary piece that rotates forward and backward together with the output shaft of the motor. A case adapter that is positioned as described above, a transmission piece that is housed in the case adapter and rotates with the rotary piece and transmits the rotation of the rotary piece to the speed reducer, and is provided along the inner wall of the case adapter, A brake spring that expands in diameter when the transmission piece rotates by input from the speed reducer and presses against the inner wall of the case adapter; And between the engaging claw of the brake spring, a brake-equipped reduction gear device characterized in that it comprises a rotating element adapter with a leaf spring which acts so as to separate between them.

  According to such a configuration, the area and frequency with which the braking spring contacts the inner wall surface of the case adapter when the rotating piece rotates is greatly reduced, so that the driving resistance at the brake portion when the motor is driven is greatly increased. Can be reduced.

  According to a fourth aspect of the present invention, there is provided a blind device characterized in that the reduction device with a brake is directly or indirectly provided on a winding shaft for winding and unwinding a shielding material up and down. According to such a configuration, the winding shaft can be rotated and stopped with high accuracy, so that the shielding material can be smoothly raised and lowered, and can be reliably prevented from dropping due to its own weight.

  According to the present invention, since the braking spring is made of a leaf spring having a predetermined width, the contact area with the transmission piece and the rotating piece is widened, and the force can be reliably transmitted. Moreover, the contact area with respect to a case adapter inner wall can be taken large. As a result, the force of the motor shaft can be reliably transmitted and output, and a sufficient braking force can be exerted against external input. And by attaching such a brake-equipped reduction gear to a winding shaft for winding and unwinding the shielding material up and down, a highly reliable blind device with stable operation can be provided.

It is a disassembled perspective view which shows one Embodiment of the deceleration device 100 with a brake concerning this invention. It is a longitudinal cross-sectional view which shows one Embodiment of the deceleration device 100 with a brake concerning this invention. 2 is a plan view showing a state in which a rotary piece 21 is attached to a shaft 11 of a motor 10. FIG. 3 is a plan view showing a state in which a case adapter 22 is attached to an end of the motor 10 so as to surround a rotary piece 21. FIG. 3 is a perspective view showing an embodiment of a braking spring 23. FIG. FIG. 3 is a plan view showing a state in which a braking spring 23 is attached between a rotary piece 21 and a case adapter 22. 3 is a longitudinal sectional view showing a transmission piece 24. FIG. It is a top view which shows the state which attached the transmission piece 24 from the state of FIG. It is a conceptual diagram which shows the motion of the brake spring 23 and the transmission piece 24 when rotating the rotation piece 21 to one direction (right direction) (forward rotation). It is a conceptual diagram which shows the motion of the braking spring 23 and the transmission piece 24 when rotating the rotation piece 21 in the opposite direction (left direction) (reverse rotation). It is a conceptual diagram which shows the state of the brake spring 23 and the rotation piece 21 when rotating the transmission piece 24 to one direction (right direction) (forward rotation). It is a conceptual diagram which shows the state of the brake spring 23 and the rotation piece 21 when the transmission piece 24 is rotated (reversely rotated) in the opposite direction (left direction). (A) is a top view which shows an example of the coil spring 40, (B) is the side view. It is a disassembled perspective view which shows other embodiment of the deceleration device 100 with a brake concerning this invention. It is a perspective view which shows an example of the rotary top 21 which attached the rotary top adapter 50. FIG. FIG. 6 is a plan view and a partially enlarged view showing an example of a rotary piece 21 with a rotary piece adapter 50 attached thereto. It is a top view which shows the effect | action of the rotary top 21 which attached the rotary top adapter 50. FIG. It is a general view which shows one Embodiment of the blind apparatus 200 using the deceleration device 100 with a brake concerning this invention.

  Next, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is an exploded perspective view showing an embodiment of a speed reducer 100 with a brake according to the present invention. As shown in the figure, the brake-equipped reduction device 100 is mainly composed of a motor 10, a brake unit 20, and a reduction gear 30.

  The motor 10 is not particularly limited, and a commercially available AC (alternating current) motor or DC (direct current) motor can be used as it is, and at a predetermined torque when rotated at a rated rotational speed by a controller (not shown). The motor shaft 11 is rotationally driven in any direction.

  As shown in FIGS. 1 and 2, the brake unit 20 mainly includes a rotating piece 21, a case adapter 22, a braking spring 23, and a transmission piece 24 in order from the motor 10 side. As shown in FIG. 3, the rotary piece 21 has a structure in which a pair of fan-shaped protrusions 21b and 21b are provided on the side surface of a cylindrical piece body 21a so as to face each other. The motor shaft 11 is fixed to the motor shaft 11 by a bolt 12a from the side surface in a state where the motor shaft 11 is passed through a through hole 21c formed at the center of the top body 21a, and the motor shaft 11 is driven as the motor 10 is driven. And rotate in forward and reverse directions.

  As shown in FIGS. 1, 2, and 4, the case adapter 22 is composed of an annular metal part positioned so as to surround the rotary piece 21, and a pair of bolts penetrating in the height direction thereof. It is attached to the end face of the motor 10 by fixing bolts (not shown) through the holes 22a and 22a. As will be described later, the outer diameter of the case adapter 22 is slightly smaller than the outer diameter of the motor 10 for the convenience of mounting the internal gear 31 constituting the outer shell of the speed reducer 30. As shown in FIG. 3, screw holes 12 and 12 are formed in the end face of the motor 10 for screwing the front ends of bolts for attaching the case adapter 22.

  As shown in FIG. 5, the braking spring 23 includes an annular leaf spring body 23 a and engagement claws 23 b and 23 b provided at both ends of the leaf spring body 23 a. Specifically, the engaging claws 23b and 23b are integrated with the leaf spring body 23a by bending the end portions of the strip-like plate spring body 23a inward at an angle of 90 ° or more. Is formed. The outer diameter of the brake spring 23 is substantially the same as or slightly smaller than the inner diameter of the case adapter 22 and larger than the outer diameter of the rotary piece 21, and as shown in FIG. It is attached so that it may be fitted in the inner wall along the inner wall.

  As shown in FIGS. 1 and 7, the transmission piece 24 includes a disk-shaped piece body 24a, a motor pinion 24b, and a pair of locking pieces 24c and 24c. A motor pinion 24b is provided at the center of the front surface (upper surface) of the top body 24a so as to protrude upward therefrom, and the locking pieces 24c and 24c are respectively provided below the periphery of the rear surface (lower surface) thereof. It is provided to extend. The locking pieces 24c and 24c have a curved shape along the inner wall surface of the case adapter 22 as shown in FIG.

  Further, a shaft hole 24d is formed at the center of the motor pinion 24b of the transmission piece 24 so as to penetrate therethrough. Then, by inserting the tip of the motor shaft 11 into the shaft hole 24d, the transmission piece 24 is mounted in the case adapter 22 so as to be placed on the rotary piece 21. Therefore, when the transmission piece 24 is mounted on the rotary piece 21 and is mounted in the case adapter 22, one of the locking pieces 24c and 24c of the transmission piece 24 is connected to the rotary piece 21 as shown in FIG. And the inner wall of the case adapter 22 between the engaging claws 23b and 23b of the brake spring 23, and the other is positioned in the gap between the rotary piece 21 and the brake spring 23. It is supposed to be.

  In addition, annular step portions 24e and 22e are formed on the outer peripheral surface of the top body 24a of the transmission piece 24 and the inner peripheral portion of the upper surface of the case adapter 22, respectively. After mounting, the dough plate-shaped adapter 25 as shown in FIG. 1 is fitted into the stepped portions 24e and 22e, thereby supporting the transmission piece 24 so that the motor pinion 24b is positioned on the axis of the motor 10. It is supposed to be.

  As shown in FIG. 2, the speed reducer 30 includes an internal gear 31 that forms an outer shell thereof, an end cover 32 provided at an end of the internal gear 31, and an output that passes through the center of the end cover 32. It is mainly composed of a shaft 33 and a gear group 34 accommodated in the internal gear 31.

  The internal gear 31 is formed so that the internal teeth extend along the longitudinal direction on the inner surface of a metal cylinder having both ends opened, and bolt holes 31a and 31a formed at the ends thereof are used. It is integrally attached to the motor 10 so as to cover the case adapter 22 of the brake unit 20 described above with a mounting bolt (not shown).

  The end cover 32 is formed with a shaft hole 32b for penetrating the output shaft 33 at the center of a cylindrical end cover main body 32a, and annular bearing houses 32c at the upper and lower edges of the shaft hole 32b. , 32c are formed. Then, ring-shaped end cover bearings 32d and 32d are fitted in these bearing houses 32c and 32c, respectively, and the output shaft 33 penetrating the shaft hole 32b by the pair of end cover bearings 32d and 32d. It comes to support.

  A pair of bolt holes 32e and 32e are provided in the skirt portion 32f at the lower end of the end cover main body 32a so as to face each other, and the end cover 32 is attached to the end cover 32 by means of a mounting bolt (not shown) using the bolt holes 32e and 32e. Are integrally attached so as to close the upper end portion of the internal gear 31.

  The gear group 34 is mainly composed of first to third gears 34a, 34b, 34c and a shaft portion 35 penetrating the center of the first to third gears 34a, 34b, 34c. The output speed of the motor shaft 11 transmitted through the transmission piece 24 is reduced to about 1/100, for example, and the output shaft 33 is rotated.

  That is, the first gear 34a includes a sun gear 36b at the center of a disk-shaped carrier 36a, and three planetary gears meshed with the motor pinion 24a and the internal gear 31 of the transmission piece 24 on the lower surface thereof. (Not shown) is rotatably provided. Further, the second gear 34b includes a sun gear 37b at the center of the disk-shaped carrier 37a, and the lower surface thereof has four gears meshed with the sun gear 36b and the internal gear 31 of the first gear 34a. A planetary gear (not shown) is rotatably provided.

  Further, the third gear 34c has a lower end of the output shaft 33 connected to the center of a disc-shaped carrier 38a, and a sun gear 37b and an internal gear 31 of the second gear 34b on the lower surface thereof. Three planetary gears (not shown) that mesh with each other are rotatably provided. As described above, the rotational speed of the motor shaft 11 transmitted through the motor pinion 24a of the transmission piece 24 is reduced to, for example, 1/4 by the first gear 34a, and further, for example, 1 by the second gear 34b. By decelerating to / 6 and further decelerating to 1/4, for example, by the third gear 34c, the output shaft 33 is rotationally driven by decelerating to about 1/100.

  Next, the operation of the brake-equipped reduction device 100 of the present invention having such a configuration will be described mainly with reference to FIGS. 9 to 12. First, as shown in FIG. 9, the motor 10 is driven to rotate (rotate normally) the rotary piece 21 in one direction (right direction). Then, as shown in FIGS. 4A to 4B, the protrusions 21b and 21b of the rotary piece 21 come into contact with the locking pieces 24c and 24c of the transmission piece 24, respectively, and rotate (forward) direction. Move to. As a result, the transmission piece 24 rotates in the forward rotation direction to drive the gear group 34, and the rotational speed of the motor shaft 11 is reduced to about 1/100 to drive the output shaft 33 to rotate in the forward rotation direction. At this time, the braking spring 23 rotates idle together with the rotating piece 21, so that it does not become a rotational resistance.

  On the other hand, when the motor 10 is driven as shown in FIG. 10 to rotate (reversely rotate) the rotating piece 21 in the opposite direction (left direction), as shown in FIGS. Projecting portions 21b and 21b abut against the opposite sides of the locking pieces 24c and 24c of the transmission piece 24 and move them in the rotation (reverse) direction. As a result, the transmission piece 24 rotates in the reverse direction to drive the gear group 34, and the rotational speed of the motor shaft 11 is reduced to about 1/100 to drive the output shaft 33 to rotate in the reverse direction. Similarly, at this time, the braking spring 23 idles together with the rotating piece 21, so that it does not become a rotational resistance.

  On the other hand, FIGS. 11 and 12 show the braking spring 23 and the rotation when the external force in the rotational direction is input from the output shaft 33 side to the transmission piece 24 through the gear group 34 when the motor 10 is stopped. The state of the frame 21 is shown. First, as shown in FIG. 11, the transmission piece 24 rotates leftward by an external force, and one locking piece 24 c of the transmission piece 24 hits one engagement claw 23 b of the braking spring 23. Then, the engagement claw 23b is pressed, the leaf spring body 23a is expanded in diameter, and the outer peripheral surface thereof is strongly pressed against the inner wall surface of the case adapter 22 to generate a strong frictional force. As a result, the rotation of the transmission piece 24 is restricted, the rotation input to the motor shaft 11 is blocked, and the brake is applied.

  Similarly, as shown in FIG. 12, when the transmission piece 24 is rotated leftward by an external force and one locking piece 24c of the transmission piece 24 hits the other engagement claw 23b of the brake spring 23, the engagement claw 23b When the leaf spring body 23a is pressed and the outer peripheral surface thereof is strongly pressed against the inner wall surface of the case adapter 22 to generate a strong frictional force, the rotation of the transmission piece 24 is restricted, and the motor shaft 11 is prevented from rotating. The rotation is blocked and the brake is applied.

  On the other hand, when the motor shaft 11 side rotates, the brake spring 23 does not act as described above, that is, the leaf spring main body 23a does not expand and is not pressed against the inner wall surface of the case adapter 22, so Therefore, the rotational force is transmitted directly to the output shaft 33 via the gear group 34 as described above.

  In the brake-equipped deceleration device 100 according to the present invention having such a configuration, since the braking spring 23 is a leaf spring having a predetermined width in the height direction, the engaging claws 23b and 23b are also wide. The contact area between the locking piece 24c of the transmission piece 24 and the protrusions 21b and 21b of the rotary piece 21 is widened. Thereby, since each other's force can be transmitted reliably, sufficient braking force can be exhibited. In addition, since the engaging claws 23b and 23b can be formed integrally simply by bending the end portion of the belt spring, the manufacturing cost can be kept low.

  It is possible to use a coil spring 40 as shown in FIG. 13 in place of the braking spring 23 made of a plate spring having a predetermined width. When such a coil spring 40 is used, a case adapter is used. Since the contact with the inner wall surface of 22 becomes a spiral line, it is difficult to exert a sufficient braking force. In addition, since the end portion of the linear coil comes into contact with the locking piece 24c of the transmission piece 24 and the protruding portions 21b and 21b of the rotating piece 21, the engagement and locking of the tip end is easily released. I have to say that it is not reliable.

  Next, FIG. 14 thru | or FIG. 17 shows other embodiment of the deceleration device 100 with a brake which concerns on this invention. As shown in the figure, in this embodiment, the rotary piece 21 is provided with a rotary piece adapter 50.

  As shown in FIGS. 14 and 15, the rotary piece adapter 50 has a peripheral plate 52 erected along an edge of a disc 51 that penetrates the motor shaft 11, and both ends of the peripheral plate 52 are radially outward. Folded folded pieces 52a and 52b are provided, and the folded pieces 52a and 52b are respectively provided with leaf springs 53a and 53b which are folded in a square shape (folded in two) and overlapped. That is, as shown in FIG. 15, the disc 51 is located on the bottom surface of the rotary piece 21, the peripheral plate 52 is located along one side of the side surface, and the folded pieces 52a and 52b are respectively protruding. It is located on the side surfaces of the parts 21b and 21b.

  And as shown in FIG. 16, when the front-end | tip of leaf | plate spring 53a, 53b provided in this folding | turning piece 52a, 52b touches the side surface of the projection part 21b of the rotation piece 21, respectively, the folding | turning piece 52a, 52b and rotation piece A certain gap (distance) is maintained between the 21 projections 21b and 21b.

  Therefore, as shown in FIG. 17A, for example, when the rotary piece 21 rotates in the clockwise direction in the figure, one of the protrusions 21b becomes a braking spring via the leaf spring 53a and the folded piece 52a of the rotary piece adapter 50. 23, the engaging claw 23b of the transmission piece 24 is moved to turn to the locking piece 24c side of the transmission piece 24, and the transmission piece 24 is rotated in the clockwise direction in the drawing by contacting with the locking piece 24c. At this time, one of the leaf springs 53a is deformed so as to be crushed and the gap is eliminated, so that the rotational force of the rotary piece 21 is efficiently transmitted to the locking piece 24c of the transmission piece 24 and at the same time the other leaf spring 53b is By further opening as the gap increases, the force in the direction of reducing the diameter of the brake spring 23 is sustained.

  As a result, the braking spring 23 expands in diameter and no braking force is generated, so that the rotational force in the clockwise direction of the rotary piece 21 is transmitted to the transmission piece 24 more efficiently. Further, as shown in FIG. 17B, when the rotating piece 21 rotates counterclockwise in the figure, one leaf spring 53b sticks and the other leaf spring 53a opens to similarly apply a braking force by the braking spring 23. Therefore, the rotational force of the rotary piece 21 in the counterclockwise direction is transmitted to the transmission piece 24 more efficiently.

  On the other hand, when a force is applied from the locking piece 24c side of the transmission piece 24, the locking piece 24c pushes one engagement claw 23b of the brake spring 23, and the other folded piece 52b of the rotary piece adapter 50 Since the brake spring 23 acts in the direction of pushing out the other engagement claw 23 b of the brake spring 23, an excellent braking force can be exhibited when the brake spring 23 instantaneously expands in diameter and abuts against the inner wall of the case adapter 22.

  Then, as shown in FIG. 17, the speed reducer 100 with a brake according to the present invention is directly or as another speed reducer as an actuator (drive source) on a winding shaft 70 for winding and unwinding the shielding member 60 up and down. Therefore, it is possible to provide the blind device 200 with stable operation and high reliability. In the figure, reference numeral 80 denotes a controller that controls the motor 10 of the brake-equipped reduction device 100 of the present invention.

  Moreover, the brake device 100 with a brake according to the present invention can be used not only as a drive source for the blind device 200 but also as an electric actuator with a brake for other various devices. For example, if the brake-equipped deceleration device 100 according to the present invention is used as an actuator for an electric wheelchair, it is possible to prevent a phenomenon in which a wheel rotates without permission when a wheelchair is stopped without using a separate brake mechanism. Moreover, if it is used as an actuator for an electric bed that can stand up as a backrest, it is possible to easily achieve such as holding the backrest at an arbitrary angle without using a complicated brake mechanism.

DESCRIPTION OF SYMBOLS 100 ... Decelerator with brake 200 ... Blind device 10 ... Motor 11 ... Motor shaft 20 ... Brake part 21 ... Rotating piece 22 ... Case adapter 23 ... Braking spring 24 ... Transmission piece 30 ... Reducer 40 ... Coil spring 50 ... Rotating piece adapter 51 ... Disc 52 ... Peripheral plates 52a and 52b ... Folded pieces 53a and 53b ... Plate spring 60 ... Shielding material 70 ... Winding shaft 80 ... Controller

Claims (4)

A motor capable of forward and reverse rotation, a speed reducer that decelerates the output rotational speed of the motor, and an output provided between the motor and the speed reducer to transmit the output from the motor to the speed reducer and from the speed reducer A brake with a brake having a brake part capable of restricting input to the motor,
The brake part is
A rotating piece that rotates forward and backward together with the output shaft of the motor, a case adapter that is positioned so as to surround the rotating piece, and that rotates within the case adapter and rotates together with the rotating piece to reduce the rotation of the rotating piece. A transmission piece that is transmitted to the machine, and a braking spring that is provided along the inner wall of the case adapter and that expands when the transmission piece side rotates by input from the speed reducer and presses against the inner wall of the case adapter. Have
The brake spring includes an annular leaf spring main body extending along an inner wall of the case adapter, and an engaging claw provided at an end of the leaf spring main body and engaged with the transmission piece. Reducer with brake. The speed reducer with brake according to claim 1,
The brake device according to claim 1, wherein the engaging claw is formed by bending an end portion of the leaf spring body inward. A motor capable of forward and reverse rotation, a speed reducer that decelerates the output rotational speed of the motor, and an output provided between the motor and the speed reducer to transmit the output from the motor to the speed reducer and from the speed reducer A brake with a brake having a brake part capable of restricting input to the motor,
The brake part is
A rotating piece that rotates forward and backward together with the output shaft of the motor, a case adapter that is positioned so as to surround the rotating piece, and that rotates within the case adapter and rotates together with the rotating piece to reduce the rotation of the rotating piece. A transmission piece to be transmitted to the machine, a braking spring provided along the inner wall of the case adapter, and having a diameter increased when the transmission piece is rotated by an input from the speed reducer and pressed against the inner wall of the case adapter; A speed reducer with a brake, comprising: a top adapter provided with a leaf spring acting between the rotating top and the engaging claw of the braking spring so as to separate them.   A blind device comprising the brake reduction device according to any one of claims 1 to 3 directly or indirectly on a winding shaft for winding and unwinding the shielding material up and down.

Images