JPS6131751Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a connecting member with multiple spherical pairs, and in particular, to form first and second sockets by opposing and joining a first connecting piece which has a recess which is a part of each socket of each spherical pair and a second connecting piece which has a recess which is the other part of each socket, thereby reducing the number of parts and assembly labor and reducing the cost of the connecting member with spherical pairs.

As a conventional connecting member with spherical pairs,
For example, there is one described in Japanese Utility Model Publication No. 56-43269. That is, in a connecting rod equipped with two spherical bearings, a concave surface that coincides with the spherical surface of one of the motion transmitting members is formed on the inner surface so as to rotatably hold the spherical surface of the motion transmitting member. a first bearing body that can be divided into a plurality of parts and has an annular protrusion formed on its outer peripheral surface; A second bearing body formed in the same manner, a pair of support plates made of sheet metal placed on both sides of the annular protrusion of both bearing bodies, and these support plates are combined to support the bearing body. This is a connecting rod consisting of a fixing member for holding the body between both support plates, and a connecting rod. Therefore, in addition to the ball, two bearing bodies that can be divided into multiple parts, two support plates, and fixing members (bolts and nuts in the drawing) are required. In addition to the large number of parts, such as having an annular protrusion on the outer surface in addition to the concave inner surface, the structure of the parts is complex, which increases the cost of the connecting member and increases the weight of the connecting member. Therefore, there is a problem that the kinetic inertia becomes large.

Therefore, this invention was devised by focusing on such conventional problems, and its purpose is to
The purpose is to reduce the number of parts, the purpose is to reduce assembly man-hours, the purpose is to reduce weight and kinetic inertia, and the purpose is to reduce cost. The aim is to reduce the

That is, as shown in the figure, this invention has a first connection member 151 consisting of a first ball 151a and a first socket 151b that holds the first ball 151a, and a second
In a connecting member having a second spherical pair 152 consisting of a ball 152a and a second socket 152b that embraces the ball, the first socket 151b
and the first connecting piece 153 forming recesses 151c and 152c which are a part of the second socket 152b, respectively, and the recess 1 which is the other part of the first socket 151b and the second socket 152b, respectively.
The second connecting piece 154 formed with 51d and 152d
The present invention relates to a connecting member having a pair of spherical surfaces, characterized in that the first and second sockets 151b and 152b are formed by connecting the sockets 151b and 152b facing each other.

This invention will be explained below with reference to illustrated embodiments.

This embodiment shows an example in which the connecting member 15 of this invention is implemented in a power transmission mechanism for operating a looper 3 of an overlock sewing machine.

As shown in FIG. 1, the looper mechanism 2 of this overlocking sewing machine has a looper link 4 extending vertically below the throat plate 10, and a looper 3 is detachably attached to the upper end of the looper link 4 with a screw 9. I am carrying it. One end of a first swing link 5 is pivotally attached to the lower end of the looper link 4, and the other end of the first swing link 5 is attached to a sewing machine frame 6, as shown in FIG. It is rotatably mounted on a fixed shaft 11. The first swing link 5 is constructed such that one end thereof can swing in a fan shape as shown by arrow B in FIG. 1, and supports the lower end of the looper link 4. One end of a second swing link 7 is pivotally attached to the midway in the longitudinal direction of the looper link 4, and the other end of the second swing link 7 is at a height slightly above a drive shaft D, which will be described later. In the sewing machine frame 6, a looper operating shaft 8 is rotatably installed.
is fixed to. Therefore, the second swing link 7
is constructed so as to swing in a fan-shape as shown by arrow A in FIG. In the figure, reference numeral 1 denotes a needle, which is carried by a needle bar (not shown), passes through a needle hole (not shown) in the throat plate 10, and moves up and down and back and forth.

As shown in FIG. 2, the looper actuating shaft 8, which can firmly support the second swing link 7 at one end, is connected to the sewing machine by a bushing 13 that is fixedly held in a sleeve 12 that is integral with the sewing machine frame 6. It is held rotatably so that the remaining end faces inside the frame 6. An L-shaped lever 14 is fixed to the remaining end of the looper operating shaft 8 facing into the sewing machine frame 6. The L-shaped lever 14 includes a cylindrical portion 14a that is fitted onto and fixed to the looper operating shaft 8, a solid portion 14b that is coaxial and integral with the cylindrical portion 14a, and a swing shaft 14c that is fixed at right angles to the solid portion 14b. It consists of. Swing shaft 14c
is connected to a crank pin 17 via a connecting member 15, which will be described later, and the crank pin 17 is connected to a drive shaft D, which is a crankshaft, via an eccentric device 16, which is a crank arm. The drive shaft D extends in a direction perpendicular to the looper operating shaft 8, and is connected at the other end (not shown) to a rotational drive source such as a motor directly or via a known transmission means.

The connecting member 15 includes two symmetrical connecting pieces 153, 1, as shown in FIGS. 5 to 7.
54, spherical recesses 151c and 152c are formed in the first connecting piece 153, and the second connecting piece 1
54, spherical recesses 151d and 152d are formed. Each recess 151c, 152c, 151d, 1
52d has the same size and shape, and both connecting pieces 15
3 and 154 facing each other and fixed with bolts and nuts 155, the recesses 151c and 151d form the first socket 151b, and the recess 152
c, 152d form the second socket 152b. First and second sockets 151b, 152
In b, there are a first ball 151a and a second ball 152a.
are individually incorporated to form a first spherical pair 151 and a second spherical pair 152, and the first sphere 151
The second ball 152a is inserted and fixed to the end of the swing shaft 14c of the L-shaped lever 14, while the second ball 152a is inserted and fixed to the end of the crank pin 17.

Both the connecting pieces 153 and 154 are made of plastic,
For example, by molding with polyacetal resin, the productivity of parts can be increased and costs can be reduced, and furthermore, by mixing molybdenum sulfide with this, lubricity can be improved.

Next, the effect will be explained.

When the eccentric device 16 is rotated by the drive of the drive shaft D, the connecting member 15 reciprocates up and down, as will be described later. As a result, the L-shaped lever 14
It rotates back and forth in the direction of the arrow in Figure 3. Thus, the looper operating shaft 8 reciprocates in the direction of arrow C in FIG. Therefore, the second swing link 7, which is firmly supported on the looper operating shaft 8, reciprocates in the direction of the bold arrow A, as shown in FIG. 1, and causes the looper link 4 to swing up and down. At this time, the first swing link 5
is driven back and forth in the direction of thick arrow B while regulating the lower end of the looper link 4. As a result, the looper 3 reciprocates up and down on the throat plate 10 so as to intersect with the needle 1 at the position shown by the dashed line, and performs overlock stitching in cooperation with the needle 1. In this embodiment, since the second swing link 7 is the operating source, the swing angle of the link 7 is small, so that the amount of eccentricity of the eccentric device 16 can be small.

The vertical reciprocating movement of the connecting member 15 is performed by the circular movement of the crank pin 17 caused by the rotation of the eccentric device 16. The circular motion of the crank pin 17 is centered on the axis of the drive shaft D, and
The second ball 152a moves circularly along the same trajectory as the circular movement. Thus, in the second spherical pair 152, the sphere 152a
While slippage occurs between the socket 152b and the socket 152b,
The connecting member 15 makes a circular motion that is a combination of vertical and horizontal movements in FIG. 6. On the other hand, the swing shaft 14c fixed to the first ball 152a
does not swing in the left-right direction in FIG. 6, but can only swing in the vertical direction. Only vertical motion is transmitted. Therefore, the connecting member 15 moves up and down while rocking left and right in FIG. 6, centering on the first ball 151a. At this time, in the first spherical pair 151, while slipping occurs between the ball 151a and the socket 151b, the connecting member 1
5 is transmitted to the ball 151a, thus causing the swing shaft 14c to swing up and down about the solid portion 14b of the L-shaped lever 14. The looper operating shaft 8 coaxially fixed to the L-shaped lever 14 rotates as described above to operate the looper 3.

8 and 9 show another embodiment, in which the tip of the swing shaft 14c of the L-shaped lever 14 is made to protrude from the first ball 151a, while the tip of the swing shaft 14c is made to protrude from the first ball 151a, Guides 153a, 15
This is an example in which 4a is provided protrudingly. Guides 153a, 15
4a are parallel to each other, and both connecting pieces 15
3,154 extending in the longitudinal direction, and facing the tip of the swing shaft 14c between them. When the connecting member 15 moves, the outer peripheral surface of the swing shaft 14c hits the inside of the guides 153a and 154a, so that the connecting member 15 rotates around the line L connecting the centers of the balls 151a and 152a. prevent movement. Other configurations and operations are the same as in the previous embodiment.

In addition, in these embodiments, both connecting pieces 15
3,154 are formed symmetrically, but they do not necessarily have to be mutually symmetrical.

As explained above, according to this invention, the first connecting piece has a recess formed as a part of each socket in a plurality of spherical pairs, and the recess is formed as the other part of each socket. Since the connecting member is constructed by simply placing the ball in the second connecting piece so as to face each other and connecting them, the number of parts is reduced, and the number of assembly steps is also reduced. Further, since no complicated processing is required, it is possible to reduce costs by reducing the number of parts and assembly man-hours, and it also has the effect of contributing to weight reduction.

[Brief explanation of the drawing]

Fig. 1 is a front view of the needle and looper mechanism showing an embodiment of this invention, Fig. 2 is a sectional view taken along the line 2-2 in Fig. 1,
Figure 3 is a sectional view taken along the line 3-3 in Figure 2, and Figure 4 is a cross-sectional view of Figure 1.
4-4 line sectional view, FIG. 5 is an enlarged sectional view of the connecting member in FIG. 3, FIG. 6 is a 6-6 line sectional view in FIG. 5, and FIG. -7 line sectional view, 8th
The figure is a sectional view showing another embodiment, and FIG. 9 is a sectional view taken along the line 9--9 in FIG. 8. In the figure, 15 is a connecting member, 151 is a first spherical pair, 152 is a second spherical pair, 151a is a first sphere, 152a is a second sphere, 151b is a first socket, and 152b is a second socket. , 151c, 1
51d, 152c, and 152d are recessed portions, 153 is a first connecting piece, and 154 is a second connecting piece.

Claims (1)

[Scope of utility model registration request] A connecting member having a first spherical pair consisting of a first sphere and a first socket that embraces the first sphere, and a second spherical pair consisting of a second sphere and a second socket that embraces the second sphere. A first connecting piece forming a concave portion which is a part of each of the first socket and the second socket;
A spherical pair is characterized in that the first and second sockets are formed by connecting the other parts of the respective sockets, ie, the second connecting pieces in which a recess is formed, to face each other. Connecting member provided.