JPS5841409Y2 - variable speed device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a variable speed device that can arbitrarily change the rotational speed of a rotatably supported output shaft.

Although there have been many types of variable speed devices, there is still no variable speed device that uses an endless chain that moves at a constant speed in one direction to vary the rotational speed of the output shaft. .

Therefore, this idea is a new idea that uses the movement of an endless chain to rotate the output shaft continuously in one direction, and the rotational speed of the output shaft can be arbitrarily varied by a simple operation. It provides a transmission.

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

As shown in the figure, a drive wheel 2 rotatably driven by a motor or the like and a wheel 3 for guiding a chain are rotatably supported on a fixed support plate 1, and an endless chain 4 is mounted between the wheels 2 and 3. is being passed over.

Teeth 6 provided on the outer periphery of a transmission wheel 5 are engaged with a part of the endless chain 4, and rotated by movement of the chain 74.

The wheel shaft 7 of the transmission wheel 5 is inserted into a horizontally elongated hole 8 formed in the support plate 1 and a vertically elongated hole 10 of a swingable lever 9 whose lower part is supported by the support plate 1, so that it can rotate freely.
When the lever 9 is swung, the transmission wheel 5 moves along the horizontally elongated hole 8, and its position can be adjusted in the direction of movement of the endless chain 4.

A disc 11 is fixed to the end of the wheel shaft 7 as shown in FIG. ing.

The fan-shaped gear 13 has a pin 15 provided at the center of the fan shape that connects to the support plate 1.
The long hole 14 formed in the fan-shaped gear 13 extends toward the pin 15.

The fan-shaped gear 13 includes a gear 17 fixed to the end of the first shaft 16.
are engaged with each other, and the first shaft 16 is rotated by the swinging of the fan-shaped gear 13.

The first shaft 16 is rotatably supported by the support plate 1, a second shaft 18 is rotatably provided in parallel to the first shaft 16, and an output shaft 19 is rotatably provided in parallel to both shafts 16 and 18. It is provided.

The gear 20 fixed to the first shaft 16 meshes with the gear 21 attached to the second shaft 18, and when the first shaft 16 rotates, the second shaft 16 is rotated.
The shaft 18 rotates in opposite directions at the same speed.

Each of the first shaft 16 and the second shaft 18 has a rook 22,
23 is mounted immovably in the axial direction and rotatable with respect to the shaft, and the tooth 22 of the rook 22 provided on the first shaft 16
' and the teeth 23' of the rook 23 provided on the second shaft 18 are opposite, and the teeth 22', 23 of each rook 22, 23 are opposite.
'A ratchet 24,25 engageable with the first shaft 1
6 and the second shaft 18, respectively.
is swingably supported on the outer periphery of the

Transmission gears 28 and 29 are connected to each of the rook 22 mounted on the first shaft 16 and the rook 23 mounted on the second shaft 18,
These transmission gears 28 and 29 are integrally provided and mesh with a gear 30 fixed to the output shaft 19.

The variable speed device shown in the embodiment has the above structure, and its operation will be explained next.

Now, when the drive wheel 2 is rotated to move the endless chain 4 at a constant speed in the direction of the arrow in FIG. 1, the transmission wheel 5 rotates at a constant speed in the direction of the arrow in FIG.

As the transmission wheel 50 rotates, the eccentric pin 12 of the disc 11 that rotates together with the transmission wheel moves in a circular motion, so that the sector gear 13 swings around the pin 15.
Gear 17 meshing with gear 3 rotates forward and backward.

Therefore, the first shaft 16 rotates forward and backward, and the rotation of the first shaft 16 is transmitted to the second shaft 18 via the gear 20.
The shaft 18 also rotates forward and backward.

A disc 26.27 is fixed to the first shaft 16 and the second shaft 18, and a ratchet 24.25 attached to the outer periphery of the disc 26.27 engages the teeth 22', 23' of the rooks 22, 23. The teeth 22 of the rooks 22 and 23 can be engaged with each other.
Since ', 23' are in opposite directions, the rooks 22 and 23 rotate or stop depending on the direction of the swinging force of the fan-shaped gear 13, and when one rook rotates, the other rook stops.

That is, when the sector gear 13 swings in the direction of the arrow in FIG. 1, the first shaft 16 rotates in the direction of the arrow in FIG. Since the shaft 18 rotates in the opposite direction to the first shaft 16, the ratchet 25 shown in FIG. 4 only moves around the outer circumference of the rook 23, and the rotation of the second shaft 18 is not transmitted to the rook 23.

Furthermore, when the sector gear 13 swings in the direction opposite to the direction of the arrow in FIG. 1, the second shaft 18 rotates in the direction of the arrow in FIG. The rotation of the second shaft 18 is thereby transmitted to the rook 23, and the ratchet 24 shown in FIG.
The rotation of the first shaft 16 is not transmitted to the rook 22.

Each rook 22, 23 is integrally equipped with a transmission gear 28.2.
9 is fixed, and the gear 30 of the output shaft 19 meshes with the transmission gears 28 and 29, so the rotation of the rooks 22 and 23 is transmitted to the output shaft 19, and the output shaft 19 rotates continuously in one direction. do.

When the lever 9 shown in FIG. 1 is swung while the output shaft 19 is rotating, the transmission wheel 5 moves along the horizontally elongated hole 8, and the transmission wheel 5 is moved to the left side in FIG. Since the circular motion locus of the eccentric pin 12 of the transmission wheel 5 is constant, the swing angle of the sector gear 13 becomes small, and as a result, the rotational speed of the output shaft 19 decreases.

Furthermore, when the transmission wheel 5 is moved to the right side in Fig. 1,
The swing angle of the fan-shaped gear 13 becomes larger, and the rotation speed of the output shaft 190 can be increased.

As described above, according to this invention, by moving the endless chain in one direction at a constant speed, the rotatably supported output shaft can be continuously rotated in one direction. The position of the transmission wheel that meshes with can be adjusted in the direction of movement of the chino, and by adjusting the position of the transmission wheel, the swinging angle of the sector gear can be arbitrarily changed. The rotational speed of the output shaft interlocked with the sector gear can be arbitrarily varied by a simple operation.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the variable speed device according to the invention, FIG. 2 is a cross-sectional plan view of the same, and FIG. 3 is a side view showing an enlarged main part of the same. 4 and 5 are longitudinal sectional front views of FIG. 3. 4... Endless chain, 5... Transmission wheel, 12... Eccentric pin, 13...
・Sector gear, 14... Long hole, 16...
1st axis, 17...Gear, 18...2nd
Axis, 19... Output shaft, 20, 21...
Gear, 22.23... Water wheel, 22', 23'.
...Teeth, 24゜25...Ratchets l-1
26, 27...disc, 28°29...
Transmission gear, 30...gear.

Claims (1)

[Scope of utility model registration request] An endless chain 4 that moves at a constant speed in one direction, a transmission wheel 5 whose position can be set in the moving direction of the chain 74 by partially engaging the teeth formed on its outer periphery with the chain 74, and a fan-shaped center supported. An eccentric pin 12 is provided on the outer periphery of the transmission wheel 5 in a long hole 14 that extends toward the center.
A sector-shaped gear 13 into which is inserted, a rotatable first shaft 16 in which a gear 17 fixed to one end meshes with the sector-shaped gear 13, and a second shaft 18 provided parallel to this first shaft 16.
Then, the gear 20 fixed to the first shaft 16 is meshed with the gear 21 fixed to the second shaft 18 to change the rotation of the first shaft 16 to the second shaft 1.
8, and an output shaft 19 provided in parallel to both shafts 16 and 18, a first transmission mechanism 22 transmitting rotation of the first shaft 16 in one direction to the output shaft 19,
24°26, 28, 30, and a second transmission mechanism 23, 25, 27, 29°30 for transmitting the rotation of the second shaft 18 in the opposite direction to the first shaft 16 to the output shaft 19. A variable speed device configured to rotate the output shaft 18 in one direction.