JP7016279B2 - Cord-like braking device - Google Patents

Description

The present invention relates to a cord-like body braking device.

Patent Document 1 describes a blind in which an elevating cord is sandwiched between a pair of shafts, the shaft is rotated by the movement of the elevating cord, and a brake portion connected to the shaft is operated to reliably give resistance to the elevating cord. Elevating device is disclosed.

Japanese Unexamined Patent Publication No. 2005-3084

However, in the invention described in Patent Document 1, since the shaft diameter of the brake device is small and slip is likely to occur between the elevating cord (cord) and the shaft, the movement of the cord can be reliably stopped. It may not be possible. Further, in the invention described in Patent Document 1, since the shaft of the braking device constantly rotates together with the cord-shaped body, the cord-shaped body may be braked even when braking is not required.

The present invention has been made in view of such circumstances, and provides a cord-like body braking device capable of reliably stopping the movement of the cord-like body and moving the cord-like body without a load when not braking. The purpose is.

In order to solve the above problems, the cord-shaped body braking device according to the present invention is provided, for example, in a box-shaped housing having an upper plate and a lower plate, and inside the housing so as to be adjacent to the upper plate. A pulley having a substantially cylindrical first tubular portion and rotatably provided around an axis, a cord-like body that abuts on the outer peripheral surface of the first tubular portion, and the above. A shaft member provided inside the housing so as to be rotatable around the axis and movable in the axial direction, a pin provided on the shaft member so as to project outward in the radial direction, and a pin fixed to the pulley. Further, the rotor is provided in the hollow portion of the first tubular portion, has a second cylindrical portion having a substantially cylindrical shape, and the shaft member is rotatably inserted into the inside of the second tubular portion. A rotor in which a cam groove into which the pin is inserted is inclined with respect to the circumferential direction in the second cylindrical portion, and a substantially disk shape fixed to the shaft member and provided in the hollow portion. A shaft plate having a plurality of serrated first protrusions formed on a surface on the lower plate side in a direction substantially orthogonal to the surface, and the shaft plate adjacent to the shaft plate. A clutch plate provided in parallel and having a substantially disk-shaped clutch plate having a plurality of serrated second protrusions that can mesh with the first protrusion on a surface facing the shaft plate, and a lower portion thereof. It is provided with a braking portion provided between the plate and the clutch plate, and an elastic member provided between the shaft member and the housing and urging the shaft member with a downward force. The pin is located at the lower end of the cam groove due to the urging force of the elastic member, the shaft plate and the clutch plate are in contact with each other, and the elastic member presses the shaft plate toward the clutch plate. When the first protrusion and the second protrusion mesh with each other and the braking portion brakes the rotation of the pulley and moves the cord-like body to rotate the pulley and the rotor in the first direction, the elastic member. The pin moves upward along the cam groove, the shaft member and the shaft plate move upward, the shaft plate separates from the clutch plate, and the pulley rotates against the urging force of the cylinder. It is characterized by being possible.

According to the present invention, the pin is located at the lower end of the cam groove due to the urging force of the elastic member, the shaft plate and the clutch plate are in contact with each other, and the elastic member presses the shaft plate toward the clutch plate to form the shaft plate. The generated first protrusion and the second protrusion formed on the clutch plate mesh with each other, and the braking portion brakes the rotation of the pulley, that is, the movement of the cord-like body. As a result, the movement of the cord can be reliably stopped. In particular, by providing a shaft plate and rotor inside the pulley, the diameter of the pulley is increased, the contact length between the cord and the pulley is secured, the friction between the cord and the pulley is increased, and the cord becomes the pulley. On the other hand, do not slip. This makes it possible to reliably brake the pulley, that is, the cord-like body.

Further, according to the present invention, when the cord-like body is moved to rotate the pulley and the rotor in the first direction, the pin moves upward along the cam groove against the urging force of the elastic member. As a result, the shaft member and the shaft plate move upward, the shaft plate is separated from the clutch plate, and the pulley can rotate. As a result, the cord can be moved without a load when not braking.

Here, the braking portion is a bearing inserted into a hole formed in the upper plate and the shaft member is inserted therein, and is in the housing in a state where the rotation phase is in agreement with the shaft member. On the other hand, a rotatable bearing, a substantially disk-shaped planetary shaft portion provided under the clutch plate so that the central axis is different from the axis, and the planeta so that the central axis substantially coincides with the axis. A shaft portion provided on the lower side of the reshafting portion and pivotally supported by the lower plate, a substantially disk-shaped planetary gear in which a hole is formed in the central portion and the planetary shaft portion is fitted into the hole, and the above-mentioned It may have a substantially annular ring gear provided on the lower plate and meshing with the planetary gear. This creates some rotational resistance between the housing and the bearing, the bearing, shaft parts and shaft plate do not rotate with the pulley, connecting the shaft plate and clutch plate, and the planetary gear and ring gear. The rotational force of the shaft component or shaft plate can be damped by the frictional force and drive loss between the two. Further, since the planetary gear and the ring gear are arranged on the same plane, the brake mechanism can be made thinner. Further, the braking force can be freely set by changing the diameter and the number of teeth of the planetary gear and the ring gear, and changing the amount of eccentricity of the planetary gear.

Here, two rod-shaped rope guides provided inside the housing and with which the cord-like body abuts are provided, and the line connecting the axis and the center of the rope guide in a plan view forms an isosceles triangle. A line that is substantially parallel to the base of the isosceles triangle and passes through the axis and the base may have different positions in a plan view. As a result, in a state where a tensile force is generated on the cord-like body, the cord-like body can be strongly pressed against the pulley and the frictional force between the cord-like body and the pulley can be increased.

Here, on the outer peripheral surface of the first tubular portion, a groove and two substantially annular convex portions adjacent to the groove are formed over the entire circumference, and the cord-shaped body is formed with the groove. May be housed in. As a result, when the cord-like body is accommodated in the groove, the cord-like body and the convex portion are brought into contact with each other, and the frictional force between the cord-like body and the pulley can be further increased.

According to the present invention, the movement of the cord can be reliably stopped, and the cord can be moved without a load when the brake is not applied.

It is a perspective view which shows the outline of the cord-like body braking device 1, and is the figure which looked at the cord-like body braking device 1 from diagonally above. It is a perspective view which shows the outline of the cord-like body braking device 1, and is the figure which looked at the cord-like body braking device 1 from diagonally below. It is a perspective view which shows the outline of the internal structure of the cord-like body braking device 1. It is sectional drawing which shows the outline of the internal structure of the cord-like body braking device 1. FIG. It is an exploded perspective view of the cord-like body braking device 1. It is a side view which shows the outline in the state which the shaft component 23, the shaft plate 24 and the rotor 26 are assembled. It is sectional drawing which cut | cut the cord-like body braking device 1 in the plane substantially parallel to the xy plane. It is sectional drawing of the cord-like body braking device 1 at the time of braking. It is sectional drawing of the cord-like body braking device 1 at the time of reverse rotation.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The cord-shaped body braking device of the present invention can be applied to a cable device for emergency escape, an elevating device driven by using a cord-shaped body, a device for raising and lowering a blind by a cord-shaped body, and the like.

1 and 2 are perspective views showing an outline of the cord-shaped body braking device 1, FIG. 1 is a view of the cord-shaped body braking device 1 viewed from diagonally above, and FIG. 2 is a view of the cord-shaped body braking device 1. It is a view seen from diagonally below. The cord-shaped body braking device 1 moves the cord-shaped body 21 (detailed later) in one direction (see the thick arrow in FIG. 1), and brakes the cord-shaped body 21 so as not to move the cord-shaped body 21 in the opposite direction. It is a device to do.

Hereinafter, the extending direction of the cord-shaped body 21 outside the cord-shaped body braking device 1 is defined as the x direction, the direction of the axis ax is defined as the z direction, and the x direction and the direction orthogonal to the z direction are defined as the y direction. Further, the x direction is the left-right direction, the y direction is the depth direction, and the z direction is the height direction. Further, in the figure, only the portion of the cord-shaped body 21 located in the vicinity of the cord-shaped body braking device 1 is shown, and the other parts are not shown.

The cord-like body braking device 1 mainly includes a housing 10, a rotary drive unit 20 (detailed later), a braking unit 30 (detailed later), and a rope guide 40. The rotary drive unit 20, the braking unit 30, and the rope guide 40 are provided inside the housing 10.

The housing 10 is a box-shaped member, and mainly has a lower plate 11 and a case portion 12. The bottom surface (upper plate 13) of the case portion 12 is arranged on the uppermost side (+ z side), and the lower plate 11 is provided so as to cover the opening portion 12a (see FIG. 5) of the case portion 12.

In FIGS. 1 and 2, the cord-like body braking device 1 is arranged so that the lower plate 11 is located on the lower side (−z side) and the upper plate 13 is located on the upper side (+ z side). The arrangement of the cord-like body braking device 1 is not limited to this. For example, the upper plate 13 may be located on the lower side and the lower plate 11 may be located on the upper side, or the upper plate 13 may be located on the left side (−x side) and the lower plate 11 may be located on the right side. ..

Two openings 12a are formed on the side surface of the case portion 12. The openings 12a are provided symmetrically at two locations on the + x side and the −x side. The opening 12a is a hole through which the cord-like body 21 is inserted, and a rope guide 40 is provided in the vicinity of the opening 12a.

A hole 13a (see FIG. 5) is formed in the upper plate 13, and a bearing 14 is inserted into the hole 13a. The bearing 14 is rotatable with respect to the hole 13a, i.e., the housing 10. The bearing 14 has a cylindrical portion, the tubular portion is inserted into the hole 13a, and the shaft member 23 (detailed later) is inserted into the tubular portion. The bearing 14 is provided in the case portion 12 so as not to move in the axial direction by the fixing member 19.

The cord-like body 21 is a flexible string-like body, for example, a rope. In the present embodiment, the rope is used as the cord-shaped body 21, but wires, cables, strings, steel wires and the like may be used as the cord-shaped body 21. Further, the cross-sectional shape of the cord-shaped body 21 is not limited to a substantially circular shape.

FIG. 3 is a perspective view showing an outline of the internal configuration of the cord-like body braking device 1. FIG. 4 is a cross-sectional perspective view showing an outline of the internal configuration of the cord-shaped body braking device 1. FIG. 5 is an exploded perspective view of the cord-like body braking device 1.

The rotation drive unit 20 mainly includes a pulley 22, a shaft component 23, a shaft plate 24, a pin 25, a rotor 26, and an elastic member 27. The pulley 22, the shaft component 23, the shaft plate 24, the rotor 26, and the elastic member 27 are arranged coaxially.

The pulley 22 is a component that changes the linear movement of the cord-like body 21 into a rotary motion, and is provided inside the case portion 12 so as to be rotatable around the axis ax. The pulley 22 mainly has a substantially cylindrical tubular portion 22a and a plate-shaped portion 22b provided at the upper end of the tubular portion 22a. A groove 22c in which the cord-shaped body 21 is housed is formed on the outer peripheral surface of the tubular portion 22a. A shaft component 23, a shaft plate 24, a pin 25, a rotor 26, and an elastic member 27 are provided in the hollow portion 22d, which is an inner region of the tubular portion 22a.

The groove 22c is formed over the entire circumference of the outer peripheral surface of the tubular portion 22a. The cord-like body 21 comes into contact with the tubular portion 22a (here, the groove 22c) over substantially half the circumference of the tubular portion 22a. Above and below the groove 22c, convex portions 22g having a substantially annular shape are provided adjacent to the groove 22c. The convex portion 22g prevents the cord-like body 21 from being displaced from the groove 22c. The groove 22c and the convex portion 22g are not essential.

Further, the number of the grooves 22c and the convex portions 22g is not limited to the illustrated form. For example, when the cord-like body braking device 1 is applied to the device for raising and lowering the blind, three grooves 22c may be provided and six convex portions 22g may be provided for opening and closing the blind and for raising and lowering the blind.

An opening 22e is formed substantially in the center of the plate-shaped portion 22b, and a bearing 14 is inserted into the opening 22e. Further, in the plate-shaped portion 22b, a shaft portion 22f substantially parallel to the tubular portion 22a is formed along the opening portion 22e.

The shaft component 23 is a substantially rod-shaped member, and is provided inside the housing 10 so as to be movable in the axial direction (z direction). The shaft component 23 has a large diameter portion 23a having a larger diameter than the other portions, and a plurality of holes 23b (here, three) into which the pins 25 are fitted are formed. The pin 25 is a metal rod, and is provided so as to project outward from the shaft component 23 in the radial direction.

A hole 14a is formed in the bearing 14. The upper shaft portion 23c on the upper end side (the portion on the upper side (+ z side) of the large diameter portion 23a) of the shaft component 23 is inserted into the hole 14a. That is, the upper shaft portion 23c is inserted into the hollow portion of the pulley 22 via the bearing 14.

The tip portion 23c-1 of the upper shaft portion 23c and the inner portion 14a-1 of the hole 14a have a substantially hexagonal shape (hereinafter, simply referred to as a cross-sectional shape) when cut on a plane substantially orthogonal to the axis line ax. Pillar shape). When the upper shaft portion 23c is inserted into the hole 14a, the tip portion 23c-1 and the back portion 14a-1 are fitted (there is a slight gap between the tip portion 23c-1 and the back portion 14a-1). May be). Therefore, the bearing 14 can rotate with respect to the housing 10 and the pulley 22 in a state where the rotation phase coincides with the shaft member 23.

In the present embodiment, the tip portion 23c-1 and the back portion 14a-1 have a substantially hexagonal column shape, and the other portions of the upper shaft portion 23c and the hole 14a have a substantially cylindrical shape, but the upper shaft portion 23c. And the entire hole 14a may have a substantially hexagonal column shape. Further, the shapes of the tip portion 23c-1 and the back portion 14a-1 are not limited to a substantially hexagonal column shape. The upper shaft portion 23c and the hole 14a may have planes that match the rotational phases of the upper shaft portion 23c and the hole 14a, respectively. For example, the tip portion 23c-1 and the back portion 14a-1 have a cross-sectional shape. It may have a substantially D shape, or it may have a substantially oval shape having two lines having substantially parallel cross-sectional shapes.

Further, a flange portion 14c is formed at the tip of the bearing 14. The flange portion 14c comes into contact with the upper end surface of the large diameter portion 23a when the shaft component 23 moves in the + z direction.

A shaft plate 24 is fixed to the shaft component 23. The shaft plate 24 is provided on the lower side (−z side) of the large diameter portion 23a of the shaft component 23, adjacent to the large diameter portion 23a. The shaft plate 24 is a substantially disk-shaped member, and the surface 24a on the lower plate 11 side has a sawtooth-shaped protrusion 24b (see FIG. 6) that projects in a direction (downward, −z direction) substantially orthogonal to the surface 24a. ) Are formed.

A hole 23d in which the elastic member 27 is provided is formed on the upper end surface of the upper shaft portion 23c. The elastic member 27 is, for example, a coil spring (here, a compression coil spring), and is provided between the housing 10 (here, the bottom surface 14b of the bearing 14) and the bottom surface 23e of the hole 23d. The elastic member 27 pushes the shaft component 23 and the shaft plate 24 toward the clutch plate 31 (detailed later), that is, in the downward direction (−z direction).

The lower shaft portion 23f, which is the lower portion of the shaft plate 24 of the shaft component 23, is inserted into the hole 32c of the clutch component 32 (detailed later). That is, the lower shaft portion 23f is pivotally supported by the lower plate 11 via the clutch component 32.

The rotor 26 is a member having a substantially cylindrical shape, and is provided in the hollow portion 22d of the pulley 22. The rotor 26 mainly has a substantially cylindrical tubular portion 26a and a plate-shaped portion 26b provided at the upper end of the tubular portion 26a. The plate-shaped portion 26b has a substantially disk shape, and a hole 26c is formed in the center thereof. The shaft portion 22f is inserted into the hole 26c. The plate-shaped portion 26b and the plate-shaped portion 22b are fixed by screws or the like.

A flange portion 14c and a large diameter portion 23a are inserted into the hollow portion 26g of the tubular portion 26a. The rotor 26 is rotatable with respect to the bearing 14, and the shaft component 23 is rotatable with respect to the rotor 26. A plurality of (here, three) cam grooves 26d into which the pins 25 are inserted are formed on the tubular portion 26a, that is, the outer peripheral surface of the rotor 26.

FIG. 6 is a side view showing an outline in a state where the shaft component 23, the shaft plate 24 and the rotor 26 are assembled. The cam groove 26d is an elongated hole and is formed so as to be inclined with respect to the circumferential direction (left-right direction in FIG. 6). The pin 25 slides along the cam groove 26d between the lower end (−z side end) 26e of the cam groove 26d and the upper end (+ z side end) 26f of the cam groove 26d. When the pin 25 is located at the lower end 26e, the shaft plate 24 is located on the lower side (−z side), and the shaft plate 24 is separated from the rotor 26 (see the solid line in FIG. 6). When the pin 25 is located at the upper end 26f, the shaft plate 24 is located on the upper side (+ z side), and the shaft plate 24 is adjacent to the rotor 26 (see the dotted line in FIG. 6).

Since the pin 25 fixed to the shaft component 23 is inserted into the cam groove 26d, the rotor 26 has a range of a certain angle (for example, about 60 degrees) in which the cam groove 26d is formed with respect to the shaft component 23. It can only rotate within.

Returning to the description of FIGS. 3 to 5. The clutch plate 31 is a member having a substantially disk shape, and is provided inside the housing 10. The clutch plate 31 is provided adjacent to the shaft plate 24 and substantially parallel to the shaft plate 24. On the surface 31a on the upper plate 13 side of the clutch plate 31, that is, the surface 31a facing the shaft plate 24, a plurality of serrated protrusions 31b protruding in a direction substantially orthogonal to the surface 31a (upward) are formed. The protrusion 31b and the protrusion 24b have substantially the same shape, and the protrusion 31b and the protrusion 24b can be meshed with each other.

When the shaft plate 24 is pressed against the clutch plate 31 by the urging force of the elastic member 27, the protrusions 31b and the protrusions 24b come into contact with each other and mesh with each other. The state in which the protrusion 31b and the protrusion 24b are in contact with each other and meshed with each other is a state in which the shaft plate 24 and the clutch plate 31 are connected, and in this state, the rotation of the pulley 22 and the rotor 26 is the braking portion 30 (detailed later). Is braked by.

The braking portion 30 is a component for braking the rotation of the pulley 22 and the rotor 26, that is, the movement of the cord-like body 21, and is provided between the lower plate 11 of the housing 10 and the clutch plate 31. The braking portion 30 mainly includes a clutch component 32 provided integrally with the clutch plate 31, a planetary gear 33, and a ring gear 34.

The clutch component 32 has a substantially disk-shaped planetary shaft portion 32a provided adjacent to the clutch plate 31 on the lower side of the clutch plate 31. The center of the planetary shaft portion 32a is eccentric so that the central axis differs from the axis ax.

A shaft portion 32b projects downward from the lower side of the planetary shaft portion 32a. The central axis of the shaft portion 32b substantially coincides with the axis ax, and the shaft portion 32b is inserted into the hole 11a formed in the lower plate 11. The shaft portion 32b is fixed to the lower plate 11 via the fixing member 19.

A hole 32c is formed in the clutch component 32 substantially in the center, and a lower shaft portion 23f is inserted into the hole 32c. The lower shaft portion 23f is slidable in the vertical direction, that is, in the axial direction inside the hole 32c, and is rotatable inside the hole 32c.

The planetary gear 33 and the ring gear 34 are brake mechanisms that make the clutch plate 31 (clutch component 32) unable to rotate due to frictional force. The planetary gear 33 is a member having a substantially disk shape, and a plurality of teeth 33a are formed on the outer peripheral surface thereof. A hole 33b is formed in the central portion of the planetary gear 33, and the planetary shaft portion 32a is fitted into the hole 33b.

The ring gear 34 is a substantially annular member formed on the lower plate 11, and is provided so as to project from the lower plate 11 toward the inside of the housing 10 (upward). A tooth 34a that meshes with the tooth 33a is formed on the inner peripheral surface of the ring gear 34.

By arranging the planetary gear 33 and the ring gear 34 on the same plane, the brake mechanism can be made thinner. The diameter and number of teeth of the planetary gear 33 and the ring gear 34, and the amount of eccentricity of the planetary gear 33 can be arbitrarily set.

When the shaft plate 24 and the clutch plate 31 are connected, the rotational force transmitted from the shaft component 23 to the brake mechanism is the frictional force or drive generated when the planetary gear 33 tries to move along the ring gear 34. It is braked by the loss.

Two rope guides 40 are provided inside the housing. The rope guide 40 is a rod-shaped member, and a groove 40a for accommodating the rope-shaped body 21 is formed on the outer peripheral surface thereof. The cord 21 abuts on the side surface of the rope guide 40, here the bottom surface of the groove 40a. Although the groove 40a is not essential, it is desirable to have the groove 40a in order to prevent the position of the cord-like body 21 from shifting.

FIG. 7 is a cross-sectional view of the cord-like body braking device 1 cut along a plane substantially parallel to the xy plane. The line connecting the axis ax and the center ax1 of the rope guide 40 in a plan view (when viewed from the z direction) forms an isosceles triangle. The line connecting the center ax1 of the rope guide 40 (the base of the isosceles triangle) is substantially parallel to the x direction.

The rope guide 40 is arranged so that the bottom surface of the groove 40a is located near the tangent line of the rope-shaped body 21 at a position where the pulley 22 and the rope-shaped body 21 are separated from each other. Further, the line connecting the center ax1 of the rope guide 40 and the line substantially parallel to the x direction and passing through the axis ax are different in position in a plan view. That is, the center ax1 of the rope guide 40 is offset with respect to the axis ax. As a result, the cord 21 is wound around the pulley 22 as long as possible (at least about half a circumference), and the angle (winding angle θ) formed by the portion where the pulley 22 and the cord 21 are in contact with each other is increased. The movement of 21 can be easily transmitted to the rotation of the pulley 22.

In FIG. 7, the winding angle θ is approximately 180 degrees, but the winding angle θ can be set to approximately 180 degrees or more by reducing the distance between the two rope guides 40 in the x direction.

Next, the operation and function of the cord-like body braking device 1 configured in this way will be described. FIG. 8 is a cross-sectional view of the cord-shaped body braking device 1 during braking (normal state). FIG. 9 is a cross-sectional view of the cord-like body braking device 1 at the time of reverse rotation.

During braking shown in FIG. 8, the shaft plate 24 is brought into close contact with the clutch plate 31 due to the repulsive force of the elastic member 27, the shaft plate 24 and the clutch plate 31 are connected, and the rotational driving force of the pulley 22 is applied to the braking portion 30. Is transmitted to. The braking portion 30 is braked by the frictional resistance when the planetary gear 33 rotates and the frictional resistance at the portion where the planetary gear 33 and the ring gear 34 mesh with each other, and as a result, the rotation of the pulley 22 is braked. As a result, the movement of the cord-like body 21 is dampened.

The bearing 14 is rotatable with respect to the housing 10, and the pulley 22 is rotatable with respect to the bearing 14. Further, since the tip portion 23c-1 and the back portion 14a-1 are fitted to match the rotational phases of the shaft component 23 and the bearing 14, there is some rotational resistance between the housing 10 and the bearing 14. Occur. Due to this rotational resistance, the bearing 14, the shaft component 23, and the shaft plate 24 do not rotate together with the pulley 22, and the shaft plate 24 and the clutch plate 31 can be connected to each other.

At the time of reverse rotation shown in FIG. 9, the cord-shaped body 21 outside the cord-shaped body braking device 1 is in a state of being pulled in the −x direction. From the state shown in FIG. 8, when the cord 21 outside the cord braking device 1 is pulled in the −x direction, the pulley 22 and the rotor 26 rotate clockwise (see the arrow in FIG. 9) when viewed from the + z direction. do. As a result, the pin 25 moves upward (from the lower end 26e toward the upper end 26f) along the cam groove 26d against the urging force of the elastic member 27, and the shaft component 23 and the shaft plate 24 move upward. Moving.

Since the tip portion 23c-1 and the back portion 14a-1 are fitted and the bearing 14 rotates together with the shaft component 23, the elastic member is deformed when the shaft component 23 moves in the axial direction and the elastic member 27 is deformed. No force is applied to the 27 in the rotational direction, and the elastic member 27 is prevented from being damaged.

When the shaft plate 24 moves upward, the shaft plate 24 and the clutch plate 31 are separated from each other, the rotation drive unit 20 is cut off from the braking unit 30, and the rotation of the pulley 22, that is, the movement of the cord 21 is not braked. It becomes a state.

In the state shown in FIG. 9, when the movement of the cord 21 is stopped, the pin 25 moves downward (from the upper end 26f toward the lower end 26e) along the cam groove 26d due to the urging force of the elastic member 27. Then, the shaft plate 24 moves downward. When the shaft plate 24 moves downward, the shaft plate 24 is pressed toward the clutch plate 31 by the urging force of the elastic member 27, the protrusions 24b and the protrusions 31b mesh with each other, and the shaft plate 24 and the clutch plate 31 are connected. Return to the state shown in FIG.

According to the present embodiment, by rotating the pulley 22 in only one direction and not rotating it in the other direction, the cord-like body 21 wound around the pulley 22 is prevented from moving in one direction. The cord 21 can be reliably braked. In particular, by providing the shaft plate 24 and the rotor 26 inside the pulley 22, the diameter of the pulley 22 is increased, thereby ensuring the contact length between the cord-like body 21 and the pulley 22, and the cord-like body 21 and the pulley 22. Friction can be increased. As a result, the cord 21 can be prevented from slipping with respect to the pulley 22 (slip loss is eliminated), and the pulley 22, that is, the cord 21 can be reliably braked. Further, by providing the shaft plate 24 and the rotor 26 inside the pulley 22, the cord-shaped body braking device 1 can be miniaturized.

Further, according to the present embodiment, since the two rope guides 40 with which the cord-like body 21 abuts are provided, the cord-like body 21 is strongly pressed against the pulley 22 by pulling the cord-like body 21. As a result, the frictional force between the cord-shaped body 21 and the pulley 22 becomes large, and by moving the cord-shaped body 21, the pulley 22 can be efficiently rotated and the cord-shaped body 21 can be reliably braked. ..

Further, according to the present embodiment, by providing the convex portions 22g having a substantially annular shape above and below the groove 22c, the cord-like body 21 and the convex portion 22g are formed when the cord-like body 21 is accommodated in the groove 22c. The frictional force between the cord 21 and the pulley 22 can be further increased by abutting them.

Further, according to the present embodiment, the pulley 22 and the rotor 26 are rotated and the pin 25 is moved along the cam groove 26d to switch between the connection and the non-connection between the shaft plate 24 and the clutch plate 31. Therefore, the operation becomes smooth. Further, the connection / non-connection between the shaft plate 24 and the clutch plate 31 can be easily and surely switched, whereby the braking force can be reliably switched on / off.

Further, according to the present embodiment, during reverse rotation (see FIG. 9), the shaft plate 24 and the clutch plate 31 are separated from each other, and the rotation drive unit 20 is disconnected from the braking unit 30, so that there is no load. The cord 21 can be moved.

Further, according to the present embodiment, since the structural parts other than the pin 25 can be formed of resin, it can be manufactured easily and at low cost.

Further, according to the present embodiment, the brake mechanism can be made thinner by adopting a brake mechanism using a plate-shaped planetary gear 33 and a ring gear 34 arranged on the same plane. Further, the braking force can be freely set by changing the diameter and the number of teeth of the planetary gear 33 and the ring gear 34, or changing the amount of eccentricity of the planetary gear 33. Therefore, the cord-like body braking device 1 can be applied to various devices.

In the present embodiment, the brake mechanism using the planetary gear 33 and the ring gear 34 is adopted, but the brake mechanism is not limited to this. For example, a rotor is provided instead of the planetary gear 33, a rib is provided instead of the ring gear 34, a viscous fluid (for example, silicon oil) is filled in the space inside the rib, and the rotor is rotated in the silicon oil. A brake mechanism that exerts power may be used. Further, for example, a brake mechanism may be used in which a plurality of gears are provided between the clutch plate 31 and the lower plate 11 and the braking force is exerted by increasing the reduction ratio. Further, for example, a brake mechanism may be used in which an eccentric weight is attached to the clutch plate 31 to intentionally disperse the rotational energy to exert a braking force. Further, for example, a brake mechanism may be used in which a magnet or an electromagnet is provided between the clutch plate 31 and the lower plate 11 to exert a braking force by a magnetic force. Further, for example, a friction plate provided between the clutch plate 31 and the lower plate 11 may be used as the brake mechanism.

Further, in the present embodiment, the rope-shaped body 21 abuts on the rope guide 40 at approximately 90 degrees, and the rope-shaped body 21 is extended in the x direction outside the rope-shaped body braking device 1, but the rope-shaped body 21 is extended in the x direction. The extension direction of the body 21 is not limited to the x direction. For example, when the cord 21 abuts on the rope guide 40 over approximately 180 degrees, the cord 21 extends in the y direction outside the cord braking device 1.

Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment and includes design changes and the like within a range not deviating from the gist of the present invention. ..

Further, in the present invention, the "abbreviation" is a concept including not only a case where the identity is exactly the same but also an error or a deformation to the extent that the identity is not lost. For example, substantially parallel and substantially orthogonal are not limited to cases of strictly parallel and orthogonal. Further, for example, even when it is simply expressed as parallel, orthogonal, etc., it includes not only the case of strictly parallel, orthogonal, etc., but also the case of substantially parallel, substantially orthogonal, etc. Further, in the present invention, the "neighborhood" is a concept indicating that, for example, when it is in the vicinity of A, it is near A and may or may not include A.

1: Cord-shaped body braking device 10: Housing 11: Lower plate 11a: Hole 12: Case portion 12a: Opening 13: Upper plate 13a: Hole 14: Bearing 14a: Hole 14b: Bottom surface 14c: Flange portion 19: Fixing member 20 : Rotation drive part 21: Cord-shaped body 22: Pulley 22a: Cylindrical part 22b: Plate-shaped part 22c: Groove 22d: Hollow part 22e: Opening part 22f: Shaft part 22g: Convex part 23: Shaft part 23a: Large diameter part 23b: Hole 23c: Upper shaft part 23d: Hole 23e: Bottom surface 23f: Lower shaft part 24: Shaft plate 24a: Surface 24b: Protrusion 25: Pin 26: Rotor 26a: Cylindrical part 26b: Plate-shaped part 26c: Hole 26d: Cam groove 26e: Lower end 26f: Upper end 26g: Hollow part 27: Elastic member 30: Braking part 31: Clutch plate 31a: Surface 31b: Protrusion 32: Clutch part 32a: Planetary shaft part 32b: Shaft part 32c: Hole 33: Planetary gear 33a: Tooth 33b: Hole 34: Ring gear 34a: Tooth 40: Rope guide 40a: Groove

Claims (4)

A box-shaped housing with an upper plate and a lower plate,
A pulley provided inside the housing so as to be adjacent to the upper plate, having a substantially cylindrical first tubular portion, and rotatably provided around an axis.
A cord-like body that abuts on the outer peripheral surface of the first tubular portion,
A shaft member provided inside the housing so as to be rotatable around the axis and movable in the axial direction,
A pin provided on the shaft member so as to project outward in the radial direction,
A rotor fixed to the pulley and provided in the hollow portion of the first tubular portion, having a second tubular portion having a substantially cylindrical shape, and the shaft member inside the second tubular portion. With a rotor formed by rotatably inserting a cam groove into which the pin is inserted into the second cylindrical portion and tilting with respect to the circumferential direction.
A substantially disk-shaped shaft plate fixed to the shaft member and provided in the hollow portion, and has a sawtooth-shaped first protrusion protruding in a direction substantially orthogonal to the surface on the lower plate side surface. With multiple formed shaft plates,
A clutch plate provided adjacent to the shaft plate and substantially parallel to the shaft plate, and a plurality of serrated second protrusions that can mesh with the first protrusion are formed on a surface facing the shaft plate. With a clutch plate in the shape of an approximately disk,
A braking portion provided between the lower plate and the clutch plate,
An elastic member provided between the shaft member and the housing and urging the shaft member with a downward force, and an elastic member.
Equipped with
In a normal state, the pin is located at the lower end of the cam groove due to the urging force of the elastic member, the shaft plate and the clutch plate are in contact with each other, and the elastic member presses the shaft plate toward the clutch plate. Then, the first protrusion and the second protrusion mesh with each other, and the braking portion brakes the rotation of the pulley.
When the pulley and the rotor are rotated in the first direction by moving the cord-like body, the pin moves upward along the cam groove against the urging force of the elastic member, and the shaft A cord-like body braking device, wherein the member and the shaft plate move upward, and the shaft plate is separated from the clutch plate so that the pulley can rotate. The braking part is
A bearing that is inserted into a hole formed in the upper plate and has a shaft member inserted therein, and is rotatable with respect to the housing in a state where the rotation phase is in agreement with the shaft member.
A substantially disk-shaped planetary shaft portion provided under the clutch plate so that the central axis is different from the axis, and
A shaft portion provided on the lower side of the planetary shaft portion so that the central axis substantially coincides with the axis line, and pivotally supported by the lower plate,
A substantially disk-shaped planetary gear in which a hole is formed in the center and the planetary shaft portion is fitted into the hole.
The cord-like body braking device according to claim 1, further comprising a substantially annular ring gear provided on the lower plate and meshing with the planetary gear. Two rod-shaped rope guides provided inside the housing and with which the cord-like body abuts are provided on the side surface thereof.
In a plan view, the line connecting the axis and the center of the rope guide forms an isosceles triangle.
The cord-like body braking device according to claim 1 or 2, wherein a line substantially parallel to the base of the isosceles triangle and passing through the axis and the base have different positions in a plan view. A groove and two substantially annular convex portions adjacent to the groove are formed on the outer peripheral surface of the first tubular portion over the entire circumference.
The cord-like body braking device according to any one of claims 1 to 3, wherein the cord-like body is housed in the groove.

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