JPH0351549Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a deformation removal device for a bevel gear.

``Prior Art'' Conventionally, a pair of mutually meshing bevel gears is provided in the power transmission system of various mechanical devices as necessary, and the rotation of one bevel gear is transmitted to the other bevel gear.

``Problem that the invention aims to solve'' However, when power is intermittently transmitted through a pair of bevel gears, there is a backlash between the teeth of both bevel gears, as in the case of normal gears. Even if the rotation of one bevel gear is stopped, the other bevel gear can continue to rotate reciprocatingly within the above-mentioned backlash range, causing a problem.

"Means for Solving Problems" In view of such circumstances, the present invention is a cam that rotates integrally with one of the bevel gears as a de-cluttering device for a pair of bevel gears that mesh with each other and transmit power intermittently. and a cam follower that rotates together with the other bevel gear and whose movement trajectory partially overlaps the movement trajectory of the cam member,
A cam groove is formed in the cam member to allow the cam follower to pass along the locus of movement of the cam follower, and at the same time the cam follower is engaged with the cam groove at the rotation stop position of the bevel gear, the pair of bevel gears The cam groove is tightly engaged with the cam follower to prevent relative rotation due to backlash.

"Operation" According to the above-mentioned configuration, when the rotation of the mutually meshed bevel gears stops, the cam groove tightly engages with the cam follower to prevent relative rotation due to backlash. When the rotation of the bevel gear is stopped, it is possible to reliably stop the rotation of the other bevel gear.

“Example” An example in which the present invention is applied to a rotary powder measuring device will be described below. In FIGS. 4 and 5, a bottomed cylindrical hopper 2 that accommodates a powder 1 such as a pharmaceutical product, etc. The shaft is arranged vertically, and a drive shaft 3 is rotatably supported at the center of the bottom. To this drive shaft 3, an agitating blade 4 made of a frame member assembled from rods is attached inside the hopper 2, and a pulley 5 is attached outside the hopper 2. This pulley 5 is interlocked with a pulley 8 attached to the drive shaft of a motor 7 via a belt 6, and is adapted to be rotated as the motor 7 is driven.

A second hopper 10 communicating with the inside of the hopper 2 is connected to the lower outer peripheral position of the cylindrical hopper 2, and a stirring blade 11 is also provided inside the second hopper 10. The stirring blades 11 are fixed to a horizontally disposed drive shaft 12, and the drive shaft 12 is communicated with the motor 7 via a power transmission system (not shown). The inside of the second hopper 10 is formed into an arc shape with its lower part adjacent to the locus of the tip of the stirring blade 11, and a supply hole 13 is opened in the center thereof.

A measuring means 1 is located below the second hopper 10.
4 is provided, and this measuring means 14 measures a predetermined amount of powder 1 supplied from the supply hole 13 of the second hopper 10, and then measures the powder 1 from the lower discharge hole 15 into the container 1.
It is designed to be filled within 6.

The measuring means 14 includes a housing 18 which is connected to the lower part of the second hopper 10 and has a circular through hole 17, and a circular housing 18 which is fitted into the through hole 17 and rotated intermittently therein. A rotary plate 19 in the form of a plate is provided, and the outer peripheral surface of the rotary plate 19 is slidably in close contact with the supply hole 13 of the second hopper 10 to close the supply hole 13.

On the outer periphery of the rotary plate 19, the rotary plate 1
A measuring chamber 20 is provided which opens on the outer peripheral surface of 9.
The opening of each measuring chamber 20 is sealed by the inner circumferential surface of the through hole 17 of the housing 18, and the measuring chamber 20 located above is connected to the supply hole 13 of the second hopper 10, and the measuring chamber 20 located below is sealed. The metering chamber 20 can be communicated with a discharge hole 15 formed in the lower part of the housing 18.

A bevel gear 22 is attached to a rotating shaft 21 provided integrally with the shaft portion of the rotating plate 19, and the bevel gear 22 meshes with a bevel gear 24 on a drive shaft 23 side that is pivotally supported in the vertical direction. The drive shaft 23 is interlocked with a motor (not shown) and is intermittently driven to rotate in 45 degree increments, thereby rotating the rotary shaft 21 and the rotary plate 19 in 45 deg increments via bevel gears 22 and 24. It can be rotated intermittently.

As shown enlarged in FIG. 1, a disk-shaped cam member 25 is attached to the outer circumference of the bevel gear 24, and a second ring-shaped member 26 is attached to the outer circumference of the other bevel gear 22. As shown in the figure, eight measuring chambers 20 are arranged at equal intervals on the rotating plate 19.
In correspondence with the provision of the cam followers 27, eight cam followers 27 are installed at equally spaced positions in the circumferential direction.

The cam follower 27 rotates integrally with the rotation of the bevel gear 22, and is set so that a part of its movement locus overlaps the outer circumference of the disc-shaped cam member 25. Cam member 2
As shown in FIG. 3, a cam groove 28 is formed on the outer periphery of the cam follower 5 to allow each cam follower 27 to pass along the locus of movement of the cam follower 27. The cam grooves 28 are formed at eight positions equally spaced in the circumferential direction depending on the number of the cam followers 27, and each cam groove 28 has a substantially V-shape.

Furthermore, the groove width of each cam groove 28 is the same as that of the cam groove 28.
The diameter of the cam follower 27 is set to be larger than the diameter of the cam follower 27 at the inlet part 28a and the outlet part 28b of the cam follower 27 to the inlet part 28. This allows for a smooth exit.

On the other hand, the groove width at the bent portion 28c of the V-shaped cam groove 28 is set to be substantially the same as the diameter of the cam follower 27.
8, it is possible to prevent the pair of bevel gears 22, 24 from rotating relative to each other due to backlash. When the cam follower 27 is located at the bent portion 28c, the rotation of the drive shaft 23 is stopped, and in this state, the upper measuring chamber 20 is connected to the supply hole 13, and the lower measuring chamber 20 is connected to the discharge hole. I am trying to communicate with 15.

In the above configuration, when the drive shaft 23 is rotationally driven, the rotation shaft 21 is rotated by the meshing of both the bevel gears 22 and 24, and thereby the cam follower 2
7 comes to be engaged in the cam groove 28 from the entrance portion 28a of the cam groove 28. And cam follower 27
When it reaches the bent portion 28c of the cam groove 28, the drive shaft 23
The rotation of the rotary shaft 21 is stopped, and thereby the rotation of the rotating shaft 21 is also stopped.

In this state, the measuring chamber 2 located above
0 is located in the supply hole 13, and the metering chamber 2 located below
0 communicates with the discharge hole 15, powder is supplied from the second hopper 10 into the measuring chamber 20 located above, and powder 1 in the measuring chamber 20 located below is supplied.
is filled into the container 16 through the discharge hole 15.

At this time, as described above, the cam follower 27 tightly engages with the cam groove 28 at the bent portion 28c and prevents the pair of bevel gears 22 and 24 from rotating relative to each other due to backlash.
It has never happened that the rotary plate 19 is suddenly reversed due to backlash at the moment when the rotation of the measuring chamber 2 stops.
It is possible to prevent the powder 1 filled into the container 16 from inside the container 16 from being scattered to the outside of the container and causing a measurement error.

"Effects of the Invention" As described above, according to the present invention, when one bevel gear stops rotating, the cam groove tightly engages with the cam follower to prevent relative rotation due to backlash. It is possible to reliably stop the rotation of the bevel gear, thereby preventing inconveniences caused by play in the other bevel gear, such as the scattering of powder as described above, or positioning errors in the rotational direction. Effects can be obtained.

[Brief explanation of the drawing]

Fig. 1 is an enlarged sectional view of the main part of Fig. 4 showing an embodiment of the present invention, Fig. 2 is a sectional view taken along the - line in Fig. 1, and Fig. 3 is a sectional view taken from the direction of arrow A in Fig. 1. FIG. 4 is a sectional view taken along the - line in FIG. 5, and FIG. 5 is a front view of the powder measuring device. 21... Rotating shaft, 23... Drive shaft, 22, 24
...bevel gear, 25...cam member, 27...cam follower, 28...cam groove.

Claims (1)

[Scope of utility model registration request] A pair of bevel gears that mesh with each other and transmit power intermittently, a cam member that rotates integrally with one bevel gear, and a cam member that rotates integrally with the other bevel gear, and a part of the locus of movement corresponds to the movement of the cam member. a cam follower that overlaps the locus, the cam member is provided with a cam groove that allows the cam follower to pass along the locus of movement of the cam follower, and the cam follower is engaged with the cam groove at a rotation stop position of the bevel gear. At the same time, the cam groove is tightly engaged with the cam follower so as to prevent the pair of bevel gears from rotating relative to each other due to backlash.