JP3539845B2 - Rotary shaft braking mechanism - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention is, for example, such that when the rotating shaft is rotated in one direction, it does not rotate unless a certain degree of rotational force is applied, and when the rotating shaft is rotated in the opposite direction, an appropriate sense of resistance is obtained. The present invention relates to a braking mechanism for a rotating shaft.
[0002]
[Prior art]
A technique for receiving a braking force when the rotating shaft rotates in either the forward or reverse direction is disclosed in, for example, Japanese Patent Publication No. 1-47656 and Japanese Patent Publication No. 3-28607.
[0003]
[Problems to be solved by the invention]
In each of the above publications, there is described an operation and effect that a predetermined braking force is exerted without any backlash when the rotation axis is changed from forward rotation to reverse rotation or vice versa. However, in a specific field, it is possible to control the braking force when rotating the rotating shaft in at least one direction so that the rotating shaft can be rotated, that is, to obtain an appropriate resistance when rotating the rotating shaft. A simple configuration is required. The technology described in each of the above publications is impossible to satisfy such demands, and development thereof has been desired.
Therefore, an object of the present invention is to provide a rotating shaft braking mechanism that satisfies the above-mentioned requirements.
[0004]
[Means for Solving the Problems]
The present invention has a main shaft, a cylindrical portion, a fixed shaft fixedly or rotatably mounted on the main shaft through the cylindrical portion, and a cylindrical portion, through the cylindrical portion A state in which the cylindrical portion of the rotary shaft is sandwiched between itself and the cylindrical portion of the fixed shaft, the rotary shaft being rotatably mounted on the main shaft and being arranged alongside the fixed shaft. A spring member that presses the tubular portion of the rotating shaft against the tubular portion of the fixed shaft with its resilient force to brake the rotating shaft, and is screwed to an end of the main shaft on the spring member side, A screw member for adjusting the resilience of a spring member according to the amount of screwing, and wound around each of the cylindrical portions of the fixed shaft and the rotating shaft, the diameter of which is reduced as the rotating shaft rotates in one direction. And a coil spring capable of braking the rotary shaft.
[0005]
According to the above configuration, the cylindrical portion of the rotating shaft is pressed against the cylindrical portion of the fixed shaft by the elastic force of the spring member, so that the rotating shaft has a braking force corresponding to the elastic force of the spring member. Works. Therefore, when the rotating shaft is rotated in either the forward or reverse direction, a sense of resistance corresponding to the elastic force of the spring member is received. Here, when the screw member is screwed in the direction of the spring member, the spring force of the spring member increases and the braking force increases, and conversely, when the spring member is loosened, the braking force decreases. Therefore, it is possible to arbitrarily adjust the resistance when rotating the rotation shaft in the opposite direction.
When the fixed shaft is fixedly mounted on the main shaft and the rotating shaft is rotated in one direction, the coil springs wound on the cylindrical portions of both the fixed shaft and the rotating shaft are reduced in diameter, thereby causing rotation. The shaft is braked. The braking force by the coil spring changes depending on the frictional resistance according to the winding force of the coil spring around each tubular portion. That is, when the winding force of the coil spring is weak, the braking force is weak, and when the winding force is strong, the braking force is strong. Further, when the coil spring is a torsion coil spring having an arm at one end and the arm is engaged with either the fixed shaft or the rotating shaft, the winding force is generated with the rotation of the rotating shaft. (Frictional resistance) increases, and it becomes impossible to rotate the rotating shaft below a certain rotational force. Then, when the rotating shaft is rotated against the frictional resistance that cannot be rotated, the rotating shaft rotates. When the fixed shaft is rotatably mounted on the main shaft, the fixed shaft relatively rotates in one direction with a speed difference with respect to the rotating shaft in accordance with the winding force of the coil spring.
[0006]
Further, when the braking force on the rotation axis of the coil spring is set stronger than the braking force on the rotation axis of the spring member, the braking force of the coil spring acts substantially when rotating the rotation axis in one direction, When rotating in a direction opposite to one direction, a braking force by a spring member acts.
Furthermore, when it is desired to restrict the rotation range of the rotary shaft to a desired range, a stopper means for restricting the rotation range of the rotary shaft may be provided on the fixed shaft.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
Reference numeral 6 in FIG. 1 denotes a disk-shaped fixed plate, and a main shaft 7 is inserted into the center of the fixed plate 6 via a fixed collar (cylindrical portion) 8. The main shaft 7 is press-fitted into a fixed collar 8 and both are integrated with each other. In this case, the fixed plate 30 and the fixed collar 8 constitute the fixed shaft 30. As shown in FIG. 1B, the main shaft 7 has a head portion 7b at one end of a shaft portion 7a and a screw portion 7c at the other end. The fixed collar 8 is non-rotatably fitted to the fixed plate 6. Therefore, the main shaft 7 is fixed to the fixed plate 6 together with the fixed collar 8 and cannot be rotated. In FIG. 1B, a rotating collar (tubular portion) 9 having the same outer diameter as the fixed collar 8 is rotatably mounted on the left side of the fixed collar 8 in the shaft portion 7a of the main shaft 7. A disk-shaped rotating plate 12 is fitted to the rotating collar 9 so as not to rotate relatively. As shown in FIG. 2, an elliptical fitting hole 12a is formed in the rotating plate 12, and the end of the rotating collar 9 is fitted into the fitting hole 12a. Thus, the rotating plate 12 and the rotating collar 9 cannot rotate relative to each other and can rotate integrally. In this case, the rotating collar 9 and the rotating plate 12 constitute a rotating shaft 40. As shown in FIG. 2, a stopper piece 13 projecting leftward in FIGS. 1 and 2 is formed at a position 180 degrees apart from the outer periphery of the rotary plate 12.
[0008]
As shown in FIG. 1 (b), a substantially elliptical regulating plate (stopper means) 15 shown in FIG. A member 16 is provided, and two sets of nuts (screw members) 17a and 17b are screwed into the screw portion 7c. The nuts 17a and 17b prevent the loosening of each other, and the disc spring 16 is elastically brought into contact with the regulating plate 15 by the nuts 17a and 17b. Accordingly, both the rotating plate 12 and the rotating collar 9 are applied with a certain amount of braking force due to the frictional resistance generated by the elastic force of the disc spring 16. By the way, if the fixing position of the two nuts 17a and 17b is set to the left end side of the main shaft (if it is loosened), the elastic force of the disc spring 16 becomes small, the braking force becomes weak, and the more the nuts 17a and 17b are screwed in The spring force of the disc spring 16 is increased to increase the braking force. That is, by changing the screwing amounts of the nuts 17a and 17b, the braking force for braking the rotation of the rotating shaft 40 can be adjusted.
[0009]
As shown in FIG. 1B, a torsion coil spring 18 is wound around the outer periphery of the fixed collar 8 and the rotating collar 9. The torsion coil spring 18 has an arm (not shown) at one end, and the arm is locked to the rotating collar 9. The torsion coil spring 18 is reduced in diameter when the rotating shaft 40 tries to rotate in one direction indicated by the Q direction in FIGS. 9 is integrated with the fixed collar 8 so that the rotation of the rotating shaft 40 in the Q direction is braked. Conversely, when the rotating shaft 40 is rotated in the P direction, the torsion coil spring 18 is unwound and loosened, and the rotation of the rotating shaft 40 is allowed. The braking force of the torsion coil spring 18 on the rotating shaft 40 acts when the force for rotating the rotating shaft 40 in the Q direction is equal to or less than a predetermined value. When a further rotational force is applied, the rotating collar 9 rotates together with the torsion coil spring 18 against the wrapping force of the torsion coil spring 18 and slides on the outer peripheral surface of the fixed collar 8 to rotate. Numeral 40 rotates in the Q direction. The torsion coil spring 18 is reduced in diameter when the rotating shaft 40 rotates in one direction, and exerts the same braking action even when the arm at one end is engaged with the fixed collar 8.
[0010]
The braking force of the torsion coil spring 18 on the rotating shaft 40 is set to be stronger than the braking force of the disc spring 16 on the rotating shaft 40, and therefore, the rotating shaft 40 is substantially set in FIGS. 1 (a) and 1 (c). 2) The braking force of the torsion coil spring 18 acts when rotating in the Q direction, and the braking force by the disc spring 16 acts when rotating in the P direction, which is the opposite direction.
[0011]
As shown in FIG. 3, an oval fitting hole 15a is formed at the center of the regulating plate 15, and the shaft portion 7a of the main shaft 7 is fitted into the fitting hole 15a. Therefore, the regulating plate 15 is integrated with the main shaft 7. A pair of notches 20 are formed on the outer periphery of the regulating plate 15 in a point-symmetric manner, and a pair of steps formed at both ends of each notch 20 are respectively provided with a first stopper portion 20a and a first stopper portion 20a. The second stopper portion 20b is provided. Each of the stopper pieces 13 formed on the rotary plate 12 has an angle along the peripheral surface of the notch portion 20 between the first stopper portion 20a and the second stopper portion 20b as the rotation shaft 40 rotates. Rotate in the range of α ゜. That is, the rotation range of the rotation shaft 40 is restricted to the angle α ゜ by the restriction plate 15. The rotation range α ゜ of the rotating shaft 40 determined by the first stopper portion 20a and the second stopper portion 20b can be arbitrarily set depending on how much the peripheral length of the notch portion 20 is formed. The rotation angle α ゜ in this case is set to 70 to 80 °.
[0012]
Next, the rotating action of the rotating shaft 40 will be described.
The rotation shaft 40 is rotated in the direction P in FIGS. 1A and 1C from the state where each stopper piece 13 of the rotation plate 12 of the rotation shaft 40 is in contact with the first stopper portion 20a of the regulating plate 15. Then, the rotating shaft 40 can be rotated while feeling the resistance according to the braking force by the disc spring 16. The resistance can be adjusted to the user's preference by adjusting the screwing amounts of the nuts 17a and 17b. By the way, if the nuts 17a and 17b are completely loosened to eliminate the elasticity of the disc spring 16, there is no resistance and the rotating shaft 40 can be rotated with a very light force. If the rotation shaft 40 is rotated in the Q direction with the rotation shaft 40 rotated to a desired position, the rotation shaft 40 does not rotate due to the braking force of the torsion coil spring 18 described above. When the force for rotating the rotating shaft 40 is further increased, the rotating collar 9 rotates together with the torsion coil spring 18 against the wrapping force of the torsion coil spring 18 and slides on the outer peripheral surface of the fixed collar 8 to rotate. 40 can be rotated in the Q direction. The rotating shaft 40 is always held at a position rotated by the braking force of the disc spring 16.
The fixed shaft 30 and the rotating shaft 40 are provided with levers on the rotating plates 6 and 12, gears are formed on the outer peripheral surfaces of the rotating plates 6 and 12, and the rotating plates 6 and 12 are used as pulleys. By doing so, it can be applied to various rotation mechanisms.
[0013]
Further, such a rotating shaft braking mechanism can hold the rotating shaft at a certain rotational position, brake the rotating shaft in one direction, and rotate the rotating shaft in the same direction if the braking force is exceeded. It is suitable for a field in which a structure that can receive an appropriate resistance when rotating in the opposite direction is desired. For example, various types of lids and hinges of doors can be mentioned. Specifically, doors for document lockers, lids for manuscript holders of copiers, lids for opening and closing paper feed trays for printers, lids for cooking devices such as microwave ovens, etc. Applicable to
[0014]
The present invention is not limited to the above embodiment. For example, the coil spring wound around the fixed collar 8 of the fixed shaft 30 and the rotating collar 9 of the rotating shaft 40 does not have an arm. It may be something. The braking force of the coil spring in that case depends on the frictional resistance corresponding to the winding force of the coil spring on each of the collars 8 and 9. That is, when the winding force of the coil spring is weak, the braking force is weak, and when the winding force is strong, the braking force is strong. In addition, by making the outer diameters of the collars 8 and 9 different to change the winding force of the coil springs around the collars 8 and 9, it is possible to change the sense of resistance obtained when the rotating shaft 40 is rotated.
Further, the fixed shaft 30 may be rotatably mounted on the main shaft 7. In this case, the fixed shaft 30 relatively rotates in one direction with a speed difference with respect to the rotating shaft 40 according to the winding force of the coil spring. Therefore, the present invention can be applied to, for example, a mechanism for rotating the fixed shaft 30 at a reduced speed as the rotating shaft 40 is rotated.
Further, in the fixed shaft 30, the rotating plate 6 and the fixed collar 8 may be integrated, and similarly, the rotating plate 6 and the fixed collar 8 may be integrated. The means for fixing the fixed shaft 30 to the main shaft 7 may be, other than press-fitting, bonding with an adhesive, fitting with an oval or rectangular cross section, fitting with unevenness, or the like.
[0015]
【The invention's effect】
As described above, according to the present invention, an appropriate feeling of resistance is obtained when rotating the rotating shaft, and a braking force acts when rotating in one direction, and if the braking force is opposed to the braking force, the rotating A configuration that can rotate the shaft can be realized.
[Brief description of the drawings]
1A is a side view, FIG. 1B is a cross-sectional view taken along line BB of FIG. 1A, and FIG. 1C is another side view of an embodiment of the present invention.
FIG. 2A is a side view of the rotating plate, and FIG.
FIG. 3 is a side view of a regulating plate.
[Explanation of symbols]
7 ... spindle, 8 ... fixed collar (tubular part of fixed shaft),
9: rotating collar (cylindrical portion of rotating shaft), 15: regulating plate (stopper means),
16: Belleville spring (spring member), 17a, 17b: Nut (screw member),
18 ... torsion coil spring, 30 ... fixed shaft, 40 ... rotating shaft.

Claims (3)

Spindle and
A fixed shaft having a cylindrical portion, fixedly or rotatably mounted on the main shaft through the cylindrical portion,
A rotating shaft having a tubular portion, rotatably mounted on the main shaft through the tubular portion, and mounted alongside the fixed shaft;
The main shaft is mounted with the cylindrical portion of the rotating shaft sandwiched between itself and the cylindrical portion of the fixed shaft, and the elastic portion of the cylindrical portion of the rotating shaft is attached to the cylindrical portion of the fixed shaft. A spring member that presses against and brakes the rotating shaft;
A screw member which is screwed to the end of the main shaft on the side of the spring member, and whose elasticity of the spring member is adjusted by the amount of screwing;
A coil spring wound around each of the cylindrical portions of the fixed shaft and the rotating shaft, the coil spring being capable of braking the rotating shaft by reducing its diameter as the rotating shaft rotates in one direction. And a rotating shaft braking mechanism. The braking mechanism for a rotating shaft according to claim 1, wherein a braking force of the coil spring on the rotating shaft is set stronger than a braking force of the spring member on the rotating shaft. The braking mechanism for a rotating shaft according to claim 1, wherein the main shaft is provided with stopper means for regulating a rotation range of the rotating shaft.

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