JPS6314987B2 - - Google Patents

Description

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

[Background technology]

The pine surge machine that rotates an eccentric wheel utilizes the fact that the distance from the drive shaft to 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. Shiatsu-style pine surgery is performed by applying force to the human body as the pine gradually increases in size. By the way, if the part of the wheel with the largest distance from the drive shaft is the distal axis point and the smallest part is the paraxial point, then when the distal axis approaches the human body and the paraxial point moves away from the human body, Although the drive shaft is operated by torque from rotational power, when the far axis point moves away from the human body, a state occurs where the drive shaft receives rotational torque from the human body side, that is, the load side, and rotates. And this 2
When the two states are switched, the power transmission mechanism from the rotational power to the drive shaft becomes bumpy, resulting in rattling. Rather than simply making the wheels eccentric, they are attached to the drive shaft so that they are tilted at the same time as they are eccentric, and the distance between the parts of the pair of wheels that come in contact with the human body is changed by rotation of the drive shaft. The same result was obtained when the pinching motion was performed at the same time as the acupressure motion.

[Purpose of the invention]

The present invention has been made in view of these points, and its object is to provide a pine surgery machine that can perform comfortable pine surgery without rattling due to backlash.

[Disclosure of the invention]

Accordingly, the present invention provides a pine surgery machine having a rotationally driven drive shaft and a pine surge wheel mounted eccentrically on the drive shaft. The wheel is characterized in that it is equipped with a braking means that applies braking to the drive shaft in approximately a half-rotation range of the drive shaft that changes the amount of protrusion toward the human body from the maximum to the minimum. The braking means applies braking to the drive shaft during half a turn in which the part of the body that is the longest distance from the drive shaft moves away from the human body. This prevents the drive shaft from being rotated from the load side.

The present invention will be described in detail below based on an embodiment in which a pine surge 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 is composed of an upper horizontal piece 22 on which an armrest 23 is provided, a grounding horizontal piece 21, and a front vertical piece 24 and a rear vertical piece 25 that connect these two pieces. and rear vertical piece 25
It is fixed 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 horizontal grounding piece 21 extends further rearward than the rear vertical piece 25, and the grounding horizontal piece 21 extends further rearward than the rear vertical piece 25. Wheels 29 are attached to the ends for ease of movement.

As is clear from FIG. 2, the frame 1 is a bottomed box with an open front, and a vertically long concave rib 12 is formed in the center of the back to improve strength. On both sides of the front side, an outer wall 15 and protrusions 16 protruding toward the front side located inside the outer wall 15 are provided. Inside each protrusion 16, a rack 11 is further formed integrally with the frame 1. Note that rollers 49 for running guides of the pine surge 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 portion, which serves as a running path, has a curved shape that matches the curved shape of the back of the human body.

Now, the pine surge mechanism 4 supported by the frame 1
This will be explained next. The pine surge mechanism 4 shown here has a pair of wheels 5 that are rotationally driven as pine surge 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 a running shaft 42 is inserted. The drive shaft 41 is fixed to the wheel body 5 and rotates the wheel body 5, whereas the running shaft 42 is connected to the drive shaft 41 and the wheel body 5.
is for vertically moving the frame 1, and a roller 4 is connected to one end via a cylindrical body 19.
9 and a pinion 48, and a roller 49 and a pinion 48 are directly attached to the other end. The cylindrical body 19 is freely rotatable with respect to the drive shaft 41. A control box 17 is disposed at one end of these shafts, and a gear box 18 is disposed at the other end, and shafts on which rollers 49 are mounted protrude from the control box 17 and gear box 18. ing. Therefore, this pine surge mechanism 4 has a total of 4
It has two rollers 49.

The control box 17 houses a control circuit that controls the operation of the masturbation mechanism 4 based on input from the operating device, and the gear box 18 has a motor 47 attached to its side and a differential reducer 50 inside. Power transmission mechanisms such as an electromagnetic clutch 80 and a group of reduction gears are 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 a motor 47, a planetary roller 52 held by a carrier 57 and rolling on the outer peripheral surface of the output shaft 51, and an inner shaft in which a large diameter portion and a small diameter portion of the planetary roller 52 are inscribed, respectively. It is composed of a contact ring 53, an inscribed ring 54, an output gear 55 provided on the outer circumferential surface of the inscribed ring 53, and an output gear 56 provided on the outer circumferential surface of the inscribed ring 54. When braking is applied to prevent rotation, a differential deceleration output is sent to the other output gear 56.
When the other output gear 56 is braked so that it does not rotate, a differential deceleration output appears in one output gear 55. The electromagnetic clutch 80 selectively applies braking to the output gear 55 and output gear 56 of the differential reducer 50. To briefly explain the structure of the electromagnetic clutch 80, it has a total of four coil springs 81. The hub 83 fixed to one end of the shaft 82 and the shaft 82 are controlled by a solenoid (not shown) via a movable hub 85 and a movable collar 86 to which one end of each of the coil springs 81 is connected.
A coil spring 81 applies braking to the hub 84 located at the other end for rotation in both directions, and the output gear 56 is connected to the hub 84 via a gear 64 supported by a shaft 63. A gear 87 that meshes with the output gear 55 is fixed to the shaft 82 via a gear 65 supported by the shaft 63. An elliptical gear 59 that rotates together with the gear 64 meshes with a driven elliptical gear 58 fixed to the drive shaft 41, and a gear 60 that rotates together with the gear 65 engages with the cylindrical body 19.
It meshes with a gear 57 supported by. Further, the gear 57 and the cylindrical body 19 are connected via an overload clutch 90.

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 as the drive shaft 41 rotates. The amount of protrusion toward the seat cover 8 side is changed periodically, and the distance between the parts in contact with the seat cover 8 is also changed periodically, and these movements prevent the massage of the back of a person leaning against the backrest. Let's do it. When the running shaft 42 is rotated, the pinion 48 meshing with the rack 11 through the cylinder 19 rotates, so the pine surge mechanism 4 brings each roller 49 into contact with the running path in front of the protrusion 16. 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. This is because the torque of the wheel body 5 is increased when the rotation is performed.

Now, the braking means applies braking to the drive shaft 41 for at least approximately half a rotation of the drive shaft 41, and this is made up of a bearing 31 attached to the drive shaft 41 and a spring 35 attached to the outer peripheral surface of the outer race 32 of this bearing 31. The plate 34 serves as a braking member that is urged into contact with the brake member. This bearing 31 has an inner race 33 eccentric in the same direction as the wheel 5, and one end of which is in contact with a back plate extending from the gear box 18, and a plate located at the other end of a coiled spring 35. 3
4 is designed to press the part of the outer race 32 of the bearing 31 which is the shortest distance from the drive shaft 41 when the part of the wheel body 5 which is the longest distance from the drive shaft 41 comes into contact with the human body as a load. . In other words, it may be arranged as shown in FIG. 6a or FIG. 6b.

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 part of the bearing 31 that is the longest distance from the drive shaft 41 moves away from the plate 34, and the wheel body 5 is pressed against the human body, and the bearing 31 is in a state of being pressed in the opposite direction, and when the part of the wheel body 5 that is the longest distance from the drive shaft 41 moves away from the human body, that is, the wheel body 5 When the amount of protrusion toward the human body changes from the maximum to the minimum, the portion of the bearing 31 having the greatest distance from the drive shaft 41 approaches the plate 34,
The ring 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 Figure 7 is the torque due to the load,
The broken line shows the torque due to the braking means. These two torques having opposite phases cancel each other out, thereby reducing the change in the torque of the drive shaft 41, making it possible to rotate the drive shaft 41 even with a small amount of power, and reducing the torque applied to the drive shaft 41. This prevents the transmission from switching between the power side (+) and the load side (-), thereby eliminating rattling caused by backlash in the power transmission mechanism.

The embodiment shown in FIGS. 8 to 10 does not press the bearing 31 with a spring-loaded plate 34, but instead consists of an eccentric inner ring 44 and an outer ring 46 rotatably attached to the eccentric inner ring 44. The outer circumferential surface of the outer ring 46 of the body 5 is pressed,
When the part of the wheel body 5 that is the longest distance from the drive shaft 41 presses the human body, the plate 34 presses the part that is the shortest distance from the drive shaft 41. Other than this point, the operation is the same as the previous embodiment.

Furthermore, other embodiments are shown in FIG. 11 and below. 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 brake material 38 is placed between the brake cams 37 and the brake cams 37.
is located. The brake cam 37 has an outer diameter larger than that of the remaining part of the brake cam 37, and each brake member 38 is attached to the tip of the plunger which is biased in the projecting direction by the spring 35 in the solenoid 39. It is provided. 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 the brake material 38 comes into contact with the large diameter part of the brake cam 37 and starts to apply braking, the drive shaft 41 of the wheel body 5
In order for the braking material 38 to separate from the large diameter portion of the brake cam 37 when the portion 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 is applied to the brake cam 3 in the entire section.
7, but since the braking torque is applied to the drive shaft 41 only in the necessary section, it is possible to use less power than when applying the braking torque in the entire section. It's summery. 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 to enable the same braking action to be performed in both directions of rotation of the drive shaft 41. This is because 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 connected to the brake cam 3.
7, and the brake material 38 on the right side applies braking. If the direction of rotation of the drive shaft 41 is reversed, the brake material 38 on the right side in the figure is As the vehicle is moved backward, the left braking material 38 is protruded to apply braking. 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.

〔Effect of the invention〕

As described above, in the present invention, during one rotation of the drive shaft, the braking means is activated at least in the approximately half-rotation region of the drive shaft where the amount of protrusion toward the human body of the eccentric wheel changes from the maximum to the minimum. By applying braking to the shaft, it is possible to eliminate the torque switching point where the drive shaft changes from being rotated by the torque from the power side to being rotated by the torque from the load side received via the wheels. Therefore, it is possible to prevent the occurrence of backlash in the power transmission mechanism from the power to the drive shaft, and it is possible to perform a comfortable pine surge operation. .

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the appearance of an embodiment of the present invention;
Figure 2 is a horizontal sectional view of the same pine surge mechanism as above, Figure 3 is a broken rear view of the same pine surge mechanism as above, and Figure 4
5 and 5 are side views of the above braking means, FIGS. 6 a and 6 b are side views showing different arrangement examples of the above braking means, and FIG. 7 is a characteristic diagram showing the torque curve of the same drive shaft. FIG. 8 is a horizontal sectional view of the pine surge mechanism of another embodiment, FIGS. 9 and 10 are side views of the same braking means, and FIG. 11 is a horizontal sectional view of the pine surge mechanism of still another embodiment. Fig. 12 is a side view of the braking means same as above, and Fig. 13 is a characteristic diagram showing the torque curve of the drive shaft same as above, in which 5 is a wheel body, 41 is a drive shaft, 31 is a bearing, 32 is an outer race, 3
4 is a plate as a braking member, 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.

Claims (1)

[Scope of Claims] 1. A pine surge machine having a rotationally driven drive shaft and a pine surge wheel mounted eccentrically on the drive shaft, wherein during one rotation of the drive shaft,
A pine surge machine characterized by comprising a braking means for applying braking to the drive shaft at least in an approximately half-rotation range of the drive shaft that changes the amount of protrusion of the eccentric wheel toward the human body from the maximum to the minimum. 2. Claim 1, characterized in that 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 peripheral surface of the outer race of the bearing.
Pine surge machine as described in section. 3. The braking means is formed of 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 that is fixed to the drive shaft and an outer ring that is freely rotatable with respect to the eccentric inner ring. A pine surge machine according to claim 1, characterized in that: 4. 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.
Pine surge machine as described in section. 5. Claim 4, characterized in that 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.
Pine surge machine as described in section.