JPS60135052A - Massaging machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a massage machine having a rotationally driven drive shaft and a massaging wheel mounted eccentrically on the drive shaft.

[Background technology] A massage machine that rotates an eccentric wheel uses the fact that the distance from the drive shaft of the part of the wheel that comes into contact with the human body changes as the wheel rotates due to the eccentricity of the wheel. As this distance gradually increases, force is applied to the human body to perform a shiatsu massage.By the way, the part of the wheel with the greatest distance from the drive shaft is called the distal axis point, and the smallest part is called the distal axis point. When the paraxial point is taken as the paraxial point, when the distal point approaches the human body and the paraxial point moves away from the human body, the drive shaft is operating with torque from the rotational power, but the distal point is far away from the human body. When descending, a state occurs in which the drive shaft receives synchronous torque from the human body side, that is, the load side, and rotates.When these two states switch, backlash occurs in the power transmission mechanism from the rotational power to the drive shaft. Instead of simply making the wheels eccentric, they are attached to the drive shaft with the wheels tilted at the same time as the eccentricity, and each wheel of the pair is rotated by the rotation of the drive shaft. The same thing happened in the device in which the action of pinching the human body was performed at the same time as the acupressure action by changing the distance between the contact portions with the human body.

``Object of the Invention'' The present invention has been made in view of the above points, and its object is to provide a massage machine that can perform comfortable massage without rattling due to backlash. be.

[Disclosure of the Invention] The present invention provides a massage machine having a rotationally driven drive shaft and a massaging wheel mounted eccentrically on the drive shaft. The wheel body is characterized in that it is equipped with a braking means that applies braking to the drive shaft, and the braking means applies braking to the drive shaft for half a turn in which the part of the wheel body that is the longest distance from the drive shaft moves away from the human body. Braking is applied, and this braking prevents the drive shaft from being rotated by the body, which is the cause of backlash, that is, from the load side.

The present invention will be described in detail below based on an embodiment in which a massage mechanism is incorporated into the backrest of a chair shown in the drawings.

The chair here is framed by a pair of underframes 2 as legs, a headrest 10 at the upper end, side cushions 20 at the front of both sides, a backrest frame 1 with a seat cover 8 on the front, and a seat frame 3. A seat frame 3 is arranged between both underframes 2, and the frame 1 is connected to the seat frame 3. Both the frame 1 and the underframe 2 are made of synthetic resin, and a cushion 30 is arranged on the upper surface of the seat frame 3. Each underframe 2 includes an upper horizontal piece 22 on which an armrest 23 is provided, a ground horizontal piece 21,
A front vertical piece 24 and a rear vertical piece 2 connect these two pieces.
5, the seat frame 3 is composed of the vertical piece 24
and the rear vertical piece 25 with screws. Since the frame 1 of the backrest is pivoted on both sides of the lower end to the rear end of the seat frame 3 and can be reclined freely, the grounding horizontal piece 21 extends further rearward than the rear vertical piece 25 and extends rearward. Wheels 29 are attached to the ends for ease of movement.

As is clear from FIG. 2, the frame 1 has a box-like shape with an open front and a bottom, and a vertically long gate rib 12 is formed in the center of the back to improve strength.
An outer wall 15 and protrusions 16 protruding toward the front surface located inside the outer wall 15 are provided on both sides of the front surface, and a rack 11 is further formed integrally with the frame 1 inside each protrusion 16. Note that rollers 49 for running guides of the massage mechanism, which will be described later, are composed of these protrusions 16 and racks 11, and plates (not shown) that face the protrusions 16 at a predetermined distance from each other on the front sides of the frame 1. The rail section, which serves as a running path, has a curved shape that matches the curved shape of the back of the human body.

Now, the massage mechanism 4 supported by the frame 1 will be explained next. The massage mechanism 4 shown here has a pair of wheels 5 that are rotationally driven as massage members, both eccentric in the same direction and inclined in opposite directions. It is attached to the shaft 41. The drive shaft 41 is formed of a hollow pipe, into which the traveling shaft 12 is inserted. The drive shaft 41 is fixed to the wheel body 5 and rotates the wheel body 5;
The running shaft 42 connects these drive shafts 41 and wheels 5 to the frame 1.
A roller 49 and a pinion 48 are attached to one end via a cylindrical body 19, and a roller 49 and a pinion 48 are directly attached to the other end. Note that the cylindrical body 19 is freely rotatable with respect to the drive shaft 41. A control box 17 is disposed on one end of these shafts, and a gearbox 18 is disposed on the other end, and the shafts on which the rollers 49 are mounted protrude from the control box 17 and gearbox 18. It is set up. Therefore, this massage mechanism 4 has a total of four rollers 49.

The control box 17 houses a control circuit that controls the operation of the massage mechanism 4 based on input from the operator, and the gear box 18 has a motor 47 attached to its side and a differential reduction gear inside. 50 and electromagnetic clutch 80
A power transmission mechanism such as a group of reduction gears is housed therein. This power transmission mechanism selectively transmits the power of the motor 47 to the drive shaft 41 and the traveling shaft 42,
The differential reducer 50 includes an output shaft 51 of the motor 47 and a carrier 5.
A planetary roller 52 which is held by a shaft 7 and rotates on the outer circumferential surface of an output shaft 51, an inscribed ring 53 and an inscribed ring 54 in which the large diameter part and small diameter part of the planetary roller 52 are respectively inscribed, and the outer circumference of the inscribed ring 53. Output gear 55 provided on the surface, internal ring 5
4, and when one of the output gears 55 is braked to prevent it from rotating, the other output gear 56 is provided with a differential deceleration output or the other output gear is When the output gear 56 is braked to prevent rotation, a differential deceleration output appears at one output gear 55. The electromagnetic clutch S0 selectively applies braking to the output gear 55 and the output gear 56 of the differential reducer 50. To briefly explain the structure of the electromagnetic clutch S0, it consists of a total of four coil springs S1. A solenoid (
(not shown), the coil spring S1 applies braking to the rotation in both directions to the hub S3 fixed to one end of the shaft S2 and the hub S4 located at the other end of the shaft S2. The output gear 56 is connected to the hub S4 via a gear 64 supported by a shaft 63.
A gear S7 that meshes with the output gear 55 is connected to the shaft 82 via a gear 65 supported by the shaft 63, and a gear S8 that meshes with the output gear 55.
is fixed. An elliptical gear 59 that rotates together with the gear 64 meshes with a driven elliptical gear 5S fixed to the drive shaft 41, and a gear 60 that rotates together with the gear 65 is a gear supported on the cylindrical body 19. It meshes with 57. In addition, the gear 57 and the cylinder 19 are connected to an overload clutch 90.
are connected via.

Here, the wheel body 5 is attached to the drive shaft 41 in an eccentric and inclined state as described above, so when the drive shaft 41 is rotated, the wheel body 5 is attached to the seat cover due to this rotation. The amount of protrusion toward the 8 side is periodically changed, and the interval of the part in contact with the seat cover 3 is also periodically changed, and by these movements, the back part of the human body leaning against the backrest is massaged. When the running shaft 42 is rotated, the pinion 48 that engages with the rack 11 through the cylindrical body 19 rotates, so that the massage mechanism 4, which brings each roller 49 into contact with the running path in front of the protrusion 16, rotates. It moves up and down by itself. The wheel body 5 is composed of an eccentric inner ring 44 fixed to the drive shaft 41 and an outer ring 46 freely rotatable around the outer periphery of the eccentric inner ring 44 via balls 45. Furthermore, the reason why the elliptical gear 58 and the driven elliptical gear 59 are provided in the power transmission path to the drive shaft 41 is to increase the amount of protrusion of the wheel body 5 toward the seat cover 8, that is, to increase the force exerted on the human body. When you do,
This is because the torque of the wheel body 5 is increased.

Now, this is a braking means that applies braking to the drive shaft 41 for at least approximately half a rotation of the drive shaft 41. This is a braking means that applies a brake to the drive shaft 41 for at least approximately half a rotation of the drive shaft 41. The plate 34 serves as a braking member that is urged into contact with the brake member. And this bearing 31 has race 3.
3 is eccentric in the same direction as the wheel body 5, and a plate 34 located at the other end of the coiled spring 35, one end of which is in contact with the back plate extending from the gear box 18, is eccentric in the same direction as the wheel body 5.
When the portion of the outer race 32 of the bearing 31 that is the longest distance from the drive shaft 41 contacts the human body as a load, the portion of the outer race 32 of the bearing 31 that is the shortest distance from the drive shaft 41 is pressed. In other words, Fig. 6(a) or Fig. 6(b)
It may be configured as shown in .

However, in the braking means configured in this way, since the bearing 31 is eccentric and the spring-biased plate 34 is in contact with it, the wheel body 5 presses the human body as shown in FIG. This is to provide the drive shaft 41 with a torque change that is in opposite phase to the torque change that occurs when driving.

That is, when the part of the wheel body 5 that is the longest distance from the drive shaft 41 approaches the human body, the bearing 3
The part with the greatest distance from the drive 41 of 1 is plate 3
4, the wheel body 5 is pressing against the human body, and the bearing 31 is being pressed in the opposite direction, and the distance of the wheel body 5 from the drive shaft 41 is the largest. When the part moves away from the human body, the part of the bearing 31 that is the greatest distance from the drive shaft 41 is the plate 34.
In this state, the wheel body 5 is pressed by the human body, and the bearing 31 is in a state of pressing the plate 34.

In addition, the solid line in FIG. 7 shows the torque due to the load, and the broken line shows the torque due to the braking means. These two torques, which are in opposite phases to each other, cancel each other out and cause the drive shaft 41 to
The torque change of the drive shaft 41 is reduced, and the drive shaft 41 can be rotated even with small power.
The torque applied to 1 is from the power side (+) and the load side (
-), thereby eliminating the occurrence of rattling caused by backlash in the power transmission mechanism.

In the embodiment shown in FIGS. 8 to 10, instead of pressing the bearing 31 with a spring-biased plate 34, an eccentric inner ring 44 and an outer ring 4 rotatably attached to the eccentric inner ring 44 are used.
6, and when the part of the wheel body 5 having the greatest distance from the drive shaft 41 presses the human body, the distance from the drive shaft 41 The plate 34 is supposed to press the part where is the smallest. Other than this point, the operation is the same as that of the above-mentioned embodiment. Further, other embodiments are shown in FIG. 11 and subsequent figures. The braking means here is composed of a brake cam 37 fixed to the drive shaft 41, and a braking material 38 that comes into contact with the outer peripheral surface of the brake cam 37 with a spring bias. Each braking material 38 is arranged at a position sandwiching the brake cam 37 between the brake members 38 and 37. The brake cam 37 is such that the outer diameter of approximately half its circumference is larger than the outer diameter of the remaining portion, and each braking material 38 is a tip of a plunger that is biased in the protruding direction by a spring 35 in a solenoid 39. It is set in. Therefore, if only one of the braking materials 38 is placed in a position in contact with the outer surface of the large diameter portion of the brake cam 37 and the drive shaft 41 is rotated, the part of the wheel body 5 that is the longest distance from the drive shaft 41 will be the part of the human body. When trying to move away from the brake cam 37, the braking material 38
The drive shaft 4 of the wheel body 5 starts to apply braking in contact with the large diameter part of the wheel body 5.
In order for the braking material 38 to separate from the large diameter part of the brake cam 37 when the part with the largest distance from the brake cam 37 begins to approach the human body, a torque as shown by the broken line in FIG. 13 is applied to the drive shaft. . In this case, the braking material 38 may be kept in contact with the brake cam 37 over the entire section, but since braking torque is applied to the drive shaft 41 only in the required section, the braking torque is not applied over the entire section. This requires less power than when applying a load.

Note that the other braking material 38 is used when rotating the drive shaft 41 in the reverse direction. In other words, the reason why there are two braking materials 38 and the position of each braking material 38 can be changed by a solenoid 39 is because of the drive shaft 4.
This is because the same braking action can be performed for rotations in both directions. When rotating the drive shaft 41 in the direction of the arrow shown in the figure, the braking material 38 on the right side in the figure is protruded and the braking material 38 on the left side is retracted to a position where it does not come into contact with the brake cam 37. When the rotation direction of the drive shaft 41 is reversed, the braking material 38 on the right side in the figure is moved back and the braking material 38 on the left side is protruded to apply braking. Braking is applied by the material 38. In either case, braking is applied to the drive shaft 41 only during half a rotation in which the portion of the wheel body 5 that is the longest distance from the drive shaft 41 moves away from the human body. If the drive shaft 41 rotates in only one direction, only one braking member 38 is required.

"Effects of the Invention" As described above, in the present invention, the load received through the wheels from the state in which the drive shaft is rotating due to torque from the power side is achieved by applying braking to at least approximately half a rotation of the drive shaft. It is possible to eliminate the torque switching point where the motor rotates due to torque from the side, and this prevents rattling due to backlash in the power transmission mechanism from the power source to the drive shaft. It is possible to perform a comfortable massage operation.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the appearance of an embodiment of the present invention, FIG. 2 is a horizontal cross-sectional view of the same massage mechanism, FIG. 3 is a cutaway sectional view of the same massage mechanism, and FIGS. 4 and 5 are 6(a) and 6(b) are side views showing different arrangement examples of the above braking means, FIG. 7 is a characteristic diagram showing the torque curve of the same drive shaft, and FIG. 8 is a horizontal sectional view of a massage mechanism of another embodiment. 9 and 10 are side views of the braking means as above, FIG. 11 is a horizontal sectional view of a massage mechanism of another embodiment, FIG. 12 is a side view of the braking means as above, and FIG. 13 is as above. 3 is a characteristic diagram showing the torque curve of the drive shaft of , 5 is a wheel body, 41 is a drive shaft, 31 is a bearing, 32 is an outer race, 34 is a plate as a braking member, and 37 is a brake cam. 38 is a braking material, 39 is a solenoid, 44 is an eccentric inner ring, and 46 is an outer ring. Agent Patent Attorney 1 I', III i<LFigure 4Figure 5Figure 9Figure 10

Claims (5)

[Claims] (1) A massage machine having a rotationally driven drive shaft and a massaging wheel mounted eccentrically on the drive shaft, and braking that applies braking to at least approximately half a rotation of the drive shaft. A massage machine characterized by comprising means. (2) The braking means comprises a bearing mounted eccentrically on the drive shaft, and a braking member that is spring-biased and abuts against the outer circumferential surface of the outer race of the bearing. The massage machine according to item 1. (3) The braking means is formed by a braking member that is biased by a spring and comes into contact with the outer ring of a wheel body consisting of an eccentric inner ring fixed to the drive shaft and an outer ring that can freely rotate with respect to the eccentric inner ring. The massage machine according to claim 1, characterized in that: (4) The massage machine according to claim 1, wherein the braking means comprises a cam member fixed to the drive shaft and a braking member abutting the outer peripheral surface of the cam member. (5) The massage machine according to claim 4, wherein the braking member is formed of a pair of members that protrude in accordance with the rotational direction of the drive shaft and come into contact with the outer peripheral surface of the cam member.