JPS6280350A - Mechanical speed converter - Google Patents

Abstract

PURPOSE:To prevent the generation of slip due to the variation of load during the transmission at low speed by forming a planetary traveling body into a roller in three-layer structure and freely reducing the inner diameter between a sun body and a planetary body receiver, in a mechanical speed converter for a sawing machine, etc. CONSTITUTION:A planetary traveling body is formed into a roller in three-layer structure constituted of an inner ring 1, elastic body 2, and an outer ring 3, and each inscribed diameter of a sun body 7 which inscribes the outer ring 3 of the planetary traveling body and a planetary body receiver 8 can be reduced freely. Therefore, when the gap between the sun body 7 and the planetary body receiver 8 is reduced by fastening a bolt 9, the inscribed diameter between the sun body 7 which inscribed the outer ring 3 of the planetary traveling body and the planetary body receiver 8 reduces. The outer ring 3 of the planetary traveling body compresses or pulls the elastic body 2, and is set eccentric for the inner ring 1, and contacts with a slidable body 4. In other words, the outer ring 3 of the planetary traveling body can be press- attached in adjustable ways by a proper pressure between the inscribed sun body 7, planetary body receiver 8, and a circumscribed slidable body 5 by adjusting the fastening for the bolt 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a mechanical speed conversion device and can be widely used in the field of drive construction.

(Prior Art) This type of device is disclosed in the drawings of U.S. Pat. No. 3,832,961 and used in a sewing machine.
The technique shown in Figure 0 is known.

That is, in the drawing, 53 is a main shaft, 61 is a ball, a plurality of balls 61 are arranged on the circumference around the main shaft 53, 54 is an inner ring of the ball 61, and the inner ring 54 is structurally rotatable. It is integrated with the body 56.

The rotating body 56 is rotatably fitted loosely into the main shaft 53, and is connected to the main shaft 53.
is a rotating pulley, which is constantly rotated at high speed by a motor (not shown) via a belt 80, with respect to the rotating body 56.
The key 76 allows movement in the axial direction and restricts the direction of rotation.

Reference numeral 65 denotes an outer ring of the ball 61, which is structurally integrated with the rotating body 70, and this rotating body 70 has a friction material 67 on the conical part of the outer periphery.
A friction body 68 is fixed thereto. 62.63 is
A retainer for the balls 61, which is an integral one, and the retainer 63 is fixed to the main shaft 53 with a dowel pin 64, and a friction body 74 having a friction material 63 on a conical portion on the outer periphery is fixed to the retainer 62. . The rotating body 70 is rotatably fitted loosely into the retainer 63, and includes a plurality of balls 61. Inner ring 54. Outer ring 65. Each member of the retainers 62 and 63 forms a ball bearing. still,
Reference numeral 90 denotes a brake body, which is movable in the axial direction and regulated in the direction of rotation by a pin 96 inserted into the arm.

FIG. 9 shows a state in which the main shaft 53 is rotating at a low speed, and the outer ring of the bearing is
5 is stationary, and the inner ring 54 is constantly rotated at variable speed by a rotary pulley 78 via a key 76. Then, the braking surface 77 of the rotary pulley 78 and the friction material 73 are in a separated state. From the above, the retainers 62 and 63 are the balls 61.
The main shaft 53 rotates at a reduced speed due to the planetary motion of
Rotate at low speed.

Next, when the braking body 90 and the speed change pulley 78 are moved to the left in the figure by the switching means, the braking surface 77 of the rotary pulley 78 and the friction material 73 come into contact with each other, and the braking body 90 and the friction material 6
7 leaves. From this, the power is transmitted via the knock pin 58 and the main shaft 53 rotates at high speed.

(Problems to be Solved by the Invention) However, in this prior art described above, during low speed rotation, the inner ring 54 of the bearing, the ball 61, and the ball 61
For example, in the case of a sewing machine, slippage occurs on the abutment surface of the outer ring 65 due to load fluctuations during operation, and stable low-speed transmission is no longer possible.

The present invention is intended to prevent such conventional inconveniences from occurring.

[Structure of the invention]

(Means for Solving the Problems) In the present invention, the following measures have been taken to eliminate the drawbacks of the prior art. (See Figures 1 to 6) That is, the planetary moving body shown in the figure is a roller with a three-layer structure consisting of an inner ring 11, an elastic body 2, and an outer ring 3, and the outer ring 3 of this planetary moving body The inscribed diameters of the solar body 7 and the planetary body support 8 that are inscribed with the solar body 7 and the planetary body support 8 can be freely reduced.

(Function) Remove the gap between the solar body 7 and the planetary body holder 8 shown in Figure 3 with the port 9.
When it is tightened and compressed, the inscribed diameter between the outer ring 3 of the planetary motion body, the sun body 7 and the planetary body support 8 that are inscribed therein is reduced. Therefore,
The outer ring 3 of the planetary motion body compresses and tensions the elastic body 2, and contacts the slide body 4 eccentrically with respect to the inner ring 1. (4th.
(See Figure 6) That is, by tightening the bolt 9, the outer ring 3 of the sexual movement body is press-fitted between the sun body 7 and the planetary body holder 8, which are inscribed therein, and between the sliding body 5 which is circumscribed, with an appropriate pressure that can be adjusted. be done.

(Example) In Figures 1 to 8, 1 is the inner ring of the planetary moving body, 3 is the outer ring of the planetary moving body whose outer periphery is tapered at both ends, and 2 is a circumscribing stand on the inner ring 1 and on the outer ring 3. It is a rubber-based elastic body that is inscribed. And inner ring 1 degree elasticity 2. The three members, including the outer ring 3, constitute a planetary moving body.

In the following, this embodiment will be described in the case where it is applied to a sewing machine.

4 is a planetary body shaft that rotatably supports the planetary moving body with a needle bearing 10 interposed therebetween; 5 is a planetary body shaft whose rotational direction is fixed to the shaft 6 by a parallel pin 17, and which is fitted so as to be movable in the axial direction; 7 is a solar body inscribed along a tapered part of one of the outer rings of the plurality of planetary moving bodies; 8 is a planetary body holder inscribed along the other taper of the outer ring of the plurality of planetary moving bodies; The planet receiver 8 is rotatably loosely fitted to the slide body 5 via a needle bearing 20. 9 tightens the gap between the sun body 7 and the planetary body support 9 shown in FIG. This is a bolt for press-contacting the body 5 and the solar body 7/'t1 star body support 8. Reference numeral 13 denotes a high-speed pulley that constantly rotates at high speed in conjunction with a motor via a belt (not shown). The high-speed pulley 13 is fixed to the shaft 6 with a bolt 11 via a washer 12. Reference numeral 14 indicates the slide body and the parts loosely fitted on the outer periphery of the slide body 5.
It is a spring that applies an elastic force in the direction away from the surface.

Numeral 15 is a friction material joined along the tapered surface of the high-speed pulley. Numeral 16 is a plurality of planetary shafts 4 fixed to the sliding body 5 rotatably loosely fitted through a needle bearing 19, and a friction material on one side. A driven pulley 16 having a tapered surface along the friction surface of 15 is interlocked with a sewing machine main shaft (not shown) via a belt and a contact clutch. 18 is a driven pulley 16
Thrust washers 21 and 23 between the slide body 5 and the thrust washer 22 are thrust bearings, and 24 is a washer interposed between the bolt 9 and the solar body 7.

25.27 is the thrust washer, 26 is the thrust bearing. Reference numeral 28 denotes a friction material joined along the tapered surface of the planetary receiver 8. A brake body 29 is stationary and fixed to the sewing machine arm 39 via a mounting base, and has a tapered surface along the friction surface of the friction material 28 on the inside. 30 is the sewing machine arm 39
31 is a thrust washer; 31 is a thrust washer;
32 is a thrust bearing, 33 is a thrust washer.
-134 is a retaining ring that holds a component loosely fitted on the outer periphery of the slide body 5 on the slide body.

Reference numeral 35 denotes a slide driven body having a concave cam on the side of the slide driving body 36, and a slide driven body 35 as shown in FIG.
has a groove that fits into a pin 48 fixed to the mounting base 30, thereby being fixed in the rotational direction and loosely fitted around the boss outer periphery of the mounting base 30 so as to be movable in the axial direction. 36 is a slide drive body which has a convex cam corresponding to the concave cam of the slide driven body 36 on the slide driven body 35 side, and the slide drive body 36 is structurally integrated with the clutch lever 49 (the eighth
(see figure). 38 and 40 are needle bearings, 41 is a collar, and 43 is a pin for preventing the planetary moving body from being pulled out from the planetary body axis. 44 is a link rotatably connected to the clutch lever 49; 45 is a spring that applies an elastic force so that the contact finger 46 is always in contact with the switching cam 47; 46 is a link whose one end rotates in conjunction with the main shaft; This is a switching cam (see Figure 7).

The present invention will be explained in detail below.

FIG. 1.7 shows a state in which the driven pulley 16 is rotating at a low speed. The high-speed pulley 13 is constantly rotated at high speed by a motor (not shown) via a belt (not shown). The shaft 6 rotates at high speed integrally with the high speed pulley 13, and the slide body 5 connected to the shaft 6 by a parallel pin 17 rotates at high speed. Further, the friction material 28 bonded to the tapered surface of the planetary receiver 8 is pressed against the brake body 29 by the spring 14, and the planetary receiver 8 and the solar body 7 fixed to the planetary receiver 8 with bolts 9 are fixed stationary. Ru. Therefore, the planetary motion body rotates on its own axis on the planetary body axis 4 and is prevented from pivoting on the sliding body 5, so that the driven boolean 16, which fixedly connects the planetary body axis 4, is decelerated with respect to the high speed pulley 13. Rotates at low speed. At this time, when a close clutch (not shown) between the driven pulley 16 and the sewing machine main shaft (not shown) interlocked via a belt (not shown) is connected, the sewing machine main shaft rotates at a low speed. When the main shaft of the sewing machine starts rotating at a low speed, the switching force arm 47 linked to the main shaft of the sewing machine starts rotating (FIG. 7). When the contact finger 46 contacts the switch 47 from the peak to the valley, the clutch lever 49 rotates clockwise in FIG. 7 due to the elastic force of the spring 45, and the slide drive body integrated with the clutch lever 49 moves. 36 rotates clockwise.

As the slide drive body 36 rotates clockwise, the slope of the convex cam of the slide drive body 36 engages with the slope of the slide driven body 35, causing the slide driven body 35 to slide in the axial direction. Due to the axial displacement of the slide driven body 35, the slide body 5 and the parts loosely fitted on the outer periphery of the slide body 5 are pushed against the elastic force of the spring 14. With this, the brake body 29 and the friction material 28 are separated, and the driven pulley 16 is joined together with the high speed pulley 13 via the friction material 15. Therefore, the driven pulley 16 rotates at high speed, and the main shaft of the sewing machine rotates at high speed. Further, when the contact portion between the switching cam 47 and the contact finger 46 changes from a valley to a peak, the clutch lever 49 rotates counterclockwise, and the slide drive body 36 integrated with the clutch lever 49 rotates counterclockwise. .

Due to this counterclockwise rotational movement of the slide drive body 36, the convex cam of the slide drive body 36 and the concave cam of the slide driven body 35 are fitted, and the elastic force of the spring 14 causes the slide body 5 and the slide body 5 to fit together. The parts loosely fitted on the outer periphery of the brake body 2 are pushed in the direction away from the high speed pulley 13, and
9 and the friction material 28 are joined, the driven pulley 16 rotates at low speed, and the sewing machine rotates at low speed. After a predetermined number of low-speed rotations, the contact clutch between the driven boob IJ-16 and the main shaft of the sewing machine is disengaged, and the sewing machine stops.

As described above, one cycle of low speed-high speed-low speed of the cycle sewing machine is completed.

〔Effect of the invention〕

It is conceivable to improve the assembly accuracy of parts such as the foot-moving body contact wheels and circumferential wheels constituting the planetary motion mechanism to address the shortcomings of the prior art, but this poses a problem in terms of cost. In the present invention, the inscribed diameter of the inscribed shaft of the planetary motion mechanism can be easily adjusted freely, and the elastic body is deformed accordingly, thereby eliminating the need for high parts manufacturing and assembly accuracy. The contact pressure between the moving body and the internal and external rings can be freely assembled as appropriate.

Therefore, there is no problem in terms of cost, and since the planetary moving body is provided with an elastic body, it also has secondary effects that are useful for vibration and sound insulation.

[Brief explanation of drawings]

FIG. 1 is a sectional view of one embodiment of the device of the present invention, FIG. 2 is a sectional view of the main part of the device shown in the first embodiment, and FIGS. 3 to 6 are horizontal explanatory views of the planetary motion a.
Figure 1 is an enlarged view of part A, Figure 7 is the first clutch lever described in the embodiment section of the present invention.
FIG. 8 is an explanatory perspective view of the switching section to the first and second movement positions; FIG. 9 is a cross-sectional view of a portion of the prior art device; and FIG. FIG. 1... Inner ring, 2... Elastic body, 3... Outer ring, 4...
・Planetary body axis, 5...Slide body, 6...Axis, 7...
・Solar body, 8... Planetary body support, 9... Bolt, 13
...High speed pulley, 14... Spring, 15... Friction material, 16... Driven pulley, 28... Friction material, 29
...Brake body, 30...Mounting base, 35...Slide driven body, 36...Slide drive body, 49...Taraccchi Reno Y - Figure 2, Figure 5, Figure 6, Figure 3, Figure 4vI5 Figure 9 Figure 10

Claims (1)

[Scope of Claims] A high-speed pulley that is constantly rotated at variable speeds by a motor; and a high-speed pulley that rotates in conjunction with the high-speed pulley under an elastic acting force in a direction that always moves away from the high-speed pulley at a first movement position of the clutch lever; a slide body movable in the direction; and a plurality of planetary motion bodies in contact with the outer periphery of the slide body rotatably supported, loosely fitted to the slide body and integrally engaged with a high-speed pulley at a second movement position of the clutch lever. a driven pulley that is loosely fitted to the inner periphery so that each planetary moving body is connected to the slide body; a planetary body receiver that is loosely fitted to the slide body so that it can rotate freely; a solar body fixed to the planetary body support with a bolt; a braking body that integrally engages with the planetary body support at the first movement position of the clutch lever and fixes the planetary body support and the solar body stationary; and a second brake body of the clutch lever. In a speed switching device having a slide drive body and a slide driven body that move the slide body so as to engage a high speed pulley and a driven pulley in a moving position and disengage a brake body and a planetary receiver, the inner ring and the elastic A three-layered roller-type planetary motion body having a three-part structure consisting of a body and an outer ring, and each inscribed ring in which the inscribed diameter of the inscribed ring inscribed in the planetary motion body can be reduced and adjusted. Become. Mechanical speed converter.