JPH0424265A - Driving force changing mechanism of sewing machine - Google Patents

Abstract

PURPOSE:To surely change drive force of interlocking shaft providing an embroidery material with zigzag traverse by changing sliding direction of drive lever to slide by action of a second cam rotating together with a main shaft of sewing machine through a solenoid. CONSTITUTION:First cams 16 and 17 and second cams 24 and 25 are rotated in the same direction with revolution of a main shaft 14 of sewing machine, cam-followers 68 and 69 of a pair of cam levers 60 and 61 are pushed out along a slant face of the second cams 24 and 25, an actuator 58 is transferred along a shaft line of an output shaft 30 with pushing out of the cam-followers to slide a drive lever 36, one of a pair of cam-followers 40 and 41 (e.g. 41) thereof is engaged with a groove 23 of the first cam 17 and rotation of the output shaft 30 based on revolution of the derive lever 36 is transmitted through a joint member 42 and a lever 92 to an interlocking shaft 90 for zigzag traverse. Sliding diction of the drive lever 36 is changed to movement direction of the actuator 58 by conversion of a solenoid 80 to surely control actuator with small force.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to an embroidery sewing machine that sews string-like embroidery material onto fabric by a so-called zigzag stitch, for example. Regarding force conversion mechanism.

[Conventional technology]

A mechanism for converting the rotation of the main shaft in an industrial embroidery sewing machine into reciprocating rotation for the above-mentioned zigzag is disclosed in, for example, Japanese Patent Laid-Open No. 63-47817.

According to the device disclosed in this publication, a pair of cams are provided on the axis of the main shaft so as to rotate together with the main shaft, and cam grooves are formed on opposing surfaces of the cams. Further, a cam follower is provided at the free end of the drive lever, which is supported so as to be slidable in the direction along the axis of the output shaft, which is arranged parallel to the main shaft.

While the cam is rotating, the drive lever is repeatedly slid at a predetermined timing by switching control of a solenoid. As a result, the cam followers alternately engage with the cam grooves of each cam, and the drive lever reciprocates around its axis together with the output shaft. This rotation of the output shaft is extracted as a driving force for imparting a fluttering motion to the embroidery material.

[Problem to be solved by the invention]

In the technique disclosed in the publication, the drive lever is slid by the actuation force of a solenoid. In particular, in the case of the drive source for the plovers swing, a large load is applied to the drive lever, so a large-capacity solenoid with a large operating force is required to slide the drive lever.

Furthermore, when the drive lever is repeatedly slid with a large operating force, the impact force is large, and the drive lever may return from its normal sliding position due to the reaction. As a result, the cam follower is engaged with the cam grooves of both cams, causing trouble.

The technical problems of this invention are that the force of the actuator for switching and controlling the sliding direction of the drive lever can be reduced, the impact force can be reduced, and the driving force of the sewing machine can reliably slide the drive lever to the normal position. The purpose is to provide a conversion mechanism.

[Means to solve the problem]

In order to solve the above problems, the present invention is configured as follows.

That is, the motion conversion mechanism of the present invention includes an input shaft that continuously rotates in one direction, a pair of first cams that are rotatable together with the input shaft and have cam grooves on opposing surfaces, and a first cam that is parallel to the input shaft. an output shaft disposed on the output shaft; a drive lever supported so as to be able to slide only along the axis of the output shaft; and a drive lever provided at the free end of the drive lever that allows the drive lever to move and a cam follower that selectively engages with the cam groove of either one of the first cams by sliding the cam follower along the cam groove of the rotating first cam. By engaging with the output shaft, the drive lever is configured to reciprocate around its axis together with the output shaft.

In this configuration, a pair of second cams are provided on the axis of the input shaft so as to rotate together with the input shaft, an actuating body that moves the drive lever in the sliding direction, and a second cam that rotates with respect to the actuating body. a pair of cam levers that are movably mounted and that alternately move the actuating body in the direction along the axis of the output shaft under the action of the corresponding second cam; and an actuator that rotates the second cam alternately to a position where the second cam is applied or a position where the second cam is not applied.

[For production]

According to the above configuration, by alternately rotating the pair of cam levers by the actuator, either one of the cam levers or the corresponding second cam is acted upon, and the drive lever is repeatedly slid through the actuating body. Ru.

As a result, the cam followers of the drive lever alternately engage with the cam grooves of both second cams, causing the drive lever to reciprocate around the axis of the output shaft. In other words, the sliding motion of the drive lever is based on the action of the second cam that rotates together with the input shaft, and this sliding position is ensured, and the actuator is operated with a small force that only rotates each cam lever. It's over.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. In the following embodiments, the driving force conversion mechanism of the present invention is applied to an embroidery sewing machine that sews string-like embroidery material onto fabric.

1 to 4, the main shaft 14 of the sewing machine, which is the input shaft of the driving force conversion mechanism, is arranged to pass through the housing 10 of the driving force motion conversion mechanism, and the main shaft 14 is connected to a motor (not shown). It can be continuously rotated in one direction by driving. Furthermore, a pair of first cams 16 and 17 using grooved cams are assembled on the axis of the main shaft 14 within the housing 10. The boss portions 18.19 of these first cams 16.17 are fixed to the outer periphery of the main shaft 14 by set screws 20 (see FIG. 2).
．． 17 is rotatable together with the main shaft 14. Moreover, cam grooves 22,23 are formed on the opposing inner surfaces of each first cam 16,17, respectively.

On the outer surface of the first cam 16.17, a second cam 24.25 using a plate cam is integrally attached to each first cam 16.17 with a screw 28, as shown in FIG. installed on. Therefore, these second cams 24.
25 also rotates around its axis together with the main shaft 14. A slope 26, 27 inclined in a direction along the axis of the main shaft 14 is formed on a part of the outer surface of each second cam 24, 25, respectively.

The shape and mutual relationship of the cam grooves 22, 23 of the first cam 16.17, or the relationship between these cam grooves 22.23 and the slope 26.27 of the second cam 24.25 will be described in detail later. Describe.

An output shaft 30 arranged parallel to the main shaft 14 is rotatably supported by the housing IO. A cylindrical boss member 32 is assembled on the output shaft 30 within the housing 10 . This boss member 32 can be slid in the direction along the axis with respect to the output shaft 30 by a key member 34 using a plurality of balls as shown in FIGS. 3 and 5. Rotation around it is not possible.

The drive lever 36 is attached to the housing 1 with its base end fixed to the outer periphery of the boss member 32 with a set screw 38.
It is included in 0. A pair of left and right cam followers 40 and 41 are provided at the tip (free end) of the drive lever 36, as shown in FIG. These cam followers 40.41 selectively engage the cam grooves 22.23 of one of the first cams 16.17 by sliding the drive lever 36 together with the host member 32.

Both ends of the output shaft 30 protrude outside the housing 10, and a joint member 42 is fixed to one end, and a pulley 44 is fixed to the other end. As is clear from FIG. 5, the joint member 42 has a groove 43 extending in the radial direction of the output shaft 3o (vertical direction in FIG. 5), and a lever 9 fixed to an interlocking shaft 90, which will be described later, is provided here.
No. 2 rollers 100 are engaged.

Also, a link groove 45 formed on the outer periphery of the pulley 44
A spring member 48 is wound around the output shaft 3.
It is designed to apply braking force to the rotation of 0. Both end portions of this spring member 48 are supported by support bolts 50 fixed to the outer wall of the housing 10 via brackets 11. By changing the screwing amount of the adjustment nut 52 with respect to the support bolt 50, the pulley 4 can be adjusted.
The contact force of the spring member 48 with respect to the ring groove 45 of No. 4 changes, thereby adjusting the braking force applied to the output shaft 30.

Furthermore, a support shaft 56 is arranged in the housing 10 in parallel with the main shaft 14 and the output shaft 30. An actuating body 58 and a pair of cam levers 60 and 61 are supported on the support shaft 56 in the housing 10, respectively. For details, see the boss section 62.6 of each cam lever 60.61.
3 is supported on the support shaft 56 so that it can slide in the direction along the axis and rotate around the axis. The actuating body 58 is attached to the outer periphery of both boss portions 62, 63 so as to be relatively rotatable. In addition, both boss parts 62.6
The actuating body 58 and both cam levers 60.
61 and slide in an integral relationship along the axis of the support shaft 56.

The actuating body 58 extends toward the output shaft 30, and is connected to the output shaft 30 on the outside of both ends of the boss member 32 on this shaft.
It has been accepted that it can be slid against. Therefore, if this actuating body 58 is operated along the axis of the support shaft 56,
The drive lever 36 slides along the axis of the output shaft 30.

A cam follower 68.69 is provided at the tip (free end) of the cam lever 60.61.

These cam levers 60 and 61 are connected to the solenoid 80 described later.
By rotating the actuating body 58 about the axis, the individual cam followers 68, 69 can alternately contact the slopes 26° 27 of the second cam 24, 25 corresponding to the respective cam followers 68, 69. Also, the boss portion 62 of each cam lever 60, 61,
63 includes an arm portion 7 extending upward in FIGS. 1 to 3.
0 is integrally formed. These arm portions 70 are
a plate 1 covering the upper surface of the opening of the housing 10;
2 and protrudes above the plate 12 (see FIGS. 2 and 4).

A support plate 74 is fixed to the upper surface of the plate 12 by a combination of two spacers 76 and bolts 78, with a predetermined space maintained between the plates 12, 74. A rotary type solenoid 80 used as an actuator is provided on the upper surface of the support plate 74. As shown in FIGS. 2 and 3, the shaft 82 of the solenoid 80 passes through a hole in the support plate 74 and is located between the plate 12 and the support plate 74. A substantially middle portion of a rotating member 84 is fixed to this shaft 82 by a set screw 86 (see FIGS. 2 to 4). Therefore, the rotating member 84 rotates about the axis of the shaft 82 in conjunction with the driving of the shaft 82 in accordance with the on/off control of the solenoid 80.

A roll-shaped connector 8 is provided at both ends of the rotating member 84.
8 are assembled so as to be movable in directions along their respective axes and rotatable about their respective axes.

A coupling bar 72 fixed to the arm portion 70 of the cam lever 60, 61 is inserted into a through hole formed perpendicularly to the axis of these couplings 88 so as to be slidable along its axis. It is inserted. Therefore, when the rotating member 84 rotates under the control of the solenoid 80, the cam levers 60 and 61 are rotated about the axis of the support shaft 56 through the coupling tool 88 and the coupling bar 72. Further, the rotating member 84 is connected to the upper surface plate 12.
The amount of rotation is regulated by hitting a pair of stoppers 85 fixed to.

The connection structure between the coupling tool 88 and the coupling bar 72 allows each cam lever 60, 61 to slide in the direction along the axis of the support shaft 56.

A drive shaft 90 for swinging the sewing machine is rotatably supported in the housing IO, and a base end of a lever 92 is fixed to a part of the shaft. As is clear from FIG. 5, a long hole 96 is formed at the tip of the lever 92, and an adjustment bolt 98 having a roller 100 at the tip is tightened therein so that its position can be adjusted within the range of the long hole 96. There is.

As already explained, the roller 100 is connected to the output shaft 30.
It is engaged in a groove 43 of a joint member 42 that is fixed to.

By adjusting the position of the adjustment bolt 98 as described above, the lever ratio between the output shaft 30 and the interlocking shaft 90 is changed, and the amount of rotation of the output shaft 9o is adjusted.

Next, the function based on the shape of the cam grooves 22, 23 of the first cam 16.17 and the relationship of the second cam 24.25a will be explained together with the switching control of the solenoid 80.

First, in Fig. 6 (A) and (B), the first cam 16.17 or the first
It is shown in a state in which it is unfolded from side to side when viewed from the front in FIGS. As is clear from this drawing, both cylinders - cam 1
The cam grooves 22 and 23 of 6.17 are composed of an outer groove and an inner groove having the same diameter.

However, the cam groove 2 of the cam 16 shown in FIG. 6(A)
As for No. 2, the inner groove is continuous within the rotation angle range of 36o0, and the outer groove is connected to the inner bay within the range of 3500 to 100'. On the other hand, regarding the cam groove 23 of the cam 17 shown in FIG. 6(B), the rotation angle 36
It is continuous in the range of 0°, and the inner bay is 3500 to 100'.
It communicates with the outer groove within the range of .

That is, when the cam follower 40 of the drive lever 36 is engaged with the outer groove of one of the cams 16, the cam follower 40 rotates from 350 degrees to 10 degrees as the main shaft 14 rotates.
0° into the inner groove, thereby driving the drive lever 36
The output shaft 30 rotates around its axis together with the output shaft 30. Further, when the cam follower 41 is engaged with the inner groove of the other cam 17, the cam follower 41 moves to the outer groove during the same rotation angle (350° to 100°) of the output shaft 30. The drive lever 36 rotates in the opposite direction together with the output shaft 30.

Note that the timing of shifting the engagement of the cam follower 40.41 from one side of both cam grooves 22.23 to the other is 100°.
~330°, or in this example 28
The angle between 0° and 330° is used.

Along with this, the slope 26.27 of the second cam 24.25 is also 28.
It is formed in the range of 0° to 330°. This means that
The cam groove 22.23 of the first cam 16.17 and the second cam 2
The relationship between slopes 26 and 27 of 4.25 is also clear from FIG. 7, which shows a development view of each direction of rotation.

The head of the embroidery sewing machine is shown in cross-section in FIGS. 8 and 9, respectively. To briefly explain the configuration for chidori swinging with reference to these drawings, the main shaft 14 and the interlocking shaft 90 are arranged so as to pass through the sewing machine head,
An interlocking lever 104 is fixed on the axis of this interlocking shaft 90. Interlocking lever 10 based on reciprocating rotation of interlocking shaft 90
4 is converted into an up-and-down movement of the elevating shaft 106. Further, the vertical movement of the lifting shaft 106 is transmitted to an interlocking ring 108 on the outer periphery of the bush 120, which is arranged coaxially with the needle bar 122. Note that this interlocking ring 108 moves up and down along a bush 120 together with an elevating ring 110 assembled on its outer periphery.

A guide lever 1 is provided on a part of the outer periphery of the bush 120.
14 is rotatably attached around a screw 118 as a fulcrum. The tip (lower end) of this guide lever 114 has a guide l"1 for properly guiding a string-like embroidery material (not shown) under the sewing needle 124 attached to the lower end of the needle bar 112.
There are 16. Further, the kite lever 114 and the elevating link 110 are connected by a link 112.

In the above configuration, when the main shaft 14 of the sewing machine rotates, the first cam 16, 17 and the second cam 24.degree. 25 continuously rotate in the same direction. Further, as is well known, the rotation of the main shaft 14 operates the vertical movement of the needle bar 122 and other mechanisms necessary for sewing. Now, the solenoid 80 is in an OFF state, and the drive lever 36 is in an OFF state.
, the operating body 58 and each cam lever 60, 61 are assumed to be in the states shown in FIGS. 1 to 5, respectively.

At this time, the drive lever 36 is in a state where its cam follower 41 is engaged with the cam groove 23 (outer groove) of the first cam 17 shown in FIG. 6(B). Therefore, Figure 6 (
A) Rotation angle shown in (B) and Fig. 7 110°
When the solenoid 80 is turned on at the timing shown in FIG. 4, the shaft 82 of the solenoid 80 rotates in the counterclockwise direction from the state shown in FIG. As a result, each cam lever 60, 61 rotates about the axis of the support shaft 56 in mutually opposite directions. As a result, the cam lever 60, which had been at the solid line position in FIG. 3, rotates to the imaginary line position, and conversely, the cam lever 61, which until then was at the imaginary line position in FIG. 3, rotates to the solid line position. do.

Now, as the rotation of the first cam 16, 17 and the second cam 24°25 progresses, the angle of 280° shown in Figs. 6(A), (B) and 7.
The cam follower 68 of the cam lever 60 between ~330°
is pushed along the slope 26 of the second cam 24. Accordingly, the drive lever 36 is moved to the output shaft 3 through the actuating body 58.
For example, it is slid to the left in FIG. 2 along the zero axis. Therefore, the drive lever 36 is in a state where its cam follower 40 is engaged with the cam groove 22 (outer groove) of the first cam 16 shown in FIG. 6(A). After this, as already explained, the cam follower 40 moves from the outer groove to the inner groove of the cam groove 22 between 350° and 100', and the drive lever 36 rotates together with the output shaft 3o. When the follower 40 is moved to the inner groove of the cam groove 22, the drive lever 36 is moved regardless of the rotation of the first cam 16.
does not rotate.

Rotation angle 3 shown in FIGS. 6(A)(B) and 7
When the solenoid 80 is turned off at timing 300, the pivot member 84 pivots to the original state shown in the drawing. This allows each cam lever 60.61
is also rotated around the axis of the support shaft 56 to its original position. That is, one cam lever 60 is rotated to the solid line position in FIG. 3, and the other cam lever 61 is rotated to the imaginary line position. Therefore, the cam follower 69 of the cam lever 61 is pushed along the slope 27 of the second cam 25 between 280° and 330°.

Accordingly, the drive lever 36 is slid along the axis of the output shaft 30, for example, to the right in FIG. It is in a state where it is engaged with the cam groove 23 (inner groove) of the cam 17. After this, the cam follower 41 moves from the inner groove to the outer groove of the cam groove 23 between 350° and 100°, and the drive lever 36 rotates together with the output shaft 30 in the opposite direction to that in the above case. When the follower 41 is in the outer groove of the cam groove 23, the drive lever 36 does not rotate regardless of the rotation of the first cam 17.

Rotation of the output shaft 30 around its axis based on the rotation of the drive lever 36 is transmitted to the interlocking shaft 90 through the joint member 42 and the lever 92.

Now, the rotation of the interlocking shaft 90 causes the elevating shaft 106 to move up and down through the interlocking lever 104 shown in FIGS. 8 and 9. Due to the vertical movement of the interlocking ring 108 and the elevating ring 110, the guide lever 11
4 rotates (swings) about the screw 118 as a fulcrum.

The rotation of the guide lever 114 is performed at a predetermined timing with respect to the vertical movement of the needle bar 122, so that the embroidery material guided by the guide 116 is rotated with respect to the movement of the sewing needle 124, for example, every - stitch. It will be. As a result, the embroidery material is sewn onto the fabric using a zigzag stitch.

Further, the sliding operation of the drive lever 36 is reliably controlled by the action of the second cams 24 and 25 based on the switching of the solenoid 80. Therefore, this drive lever 3
6 almost never returns due to the reaction when sliding, or if necessary, the actuating body 58 and the housing lO
A sliding resistance member such as a leaf spring may be provided between the upper plate 12 and the upper plate 12.

〔Effect of the invention〕

In this way, the present invention slides the drive lever based on the action of the second cam that rotates together with the input shaft, and uses the actuator to control only switching the sliding direction, so the force of this actuator is small. ,
Moreover, the impact force when sliding the drive lever can be reduced, and the drive lever can be reliably slid to the normal position.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is an external perspective view showing the main components of the sewing machine drive conversion mechanism, FIG. 2 is a front sectional view of the drive conversion mechanism, FIG. 3 is a side sectional view, and FIG. Figure 4 is a partially cutaway plan view, Figure 5 is a plane sectional view, and Figures 6 (A) and (B).
) is a plan view of a pair of first cams expanded from side to side, FIG. The figure is a side sectional view of the sewing machine head, and FIG. 9 is a front sectional view of the sewing machine head. 14... Input shaft (sewing machine main shaft) 16, 17... First cam 22, 23... Cam groove 24, 25... Second cam 30... Output shaft 36... Drive lever 58. ... Actuating body 60, 61 ... Cam lever 80 ... Solenoid Applicant Tokai Kogyo Sewing Machine Co., Ltd. Agent Patent attorney Oka 1) Hidehiko (3 others) Fig. Fig.

Claims (1)

[Claims] An input shaft that continuously rotates in one direction, a pair of first cams that are rotatable together with the input shaft and have cam grooves on opposing surfaces, and are arranged parallel to the input shaft. an output shaft; a drive lever supported so as to be able to slide only along the axis with respect to the output shaft; and a drive lever provided at the free end of the drive lever for sliding the drive lever along the axis of the output shaft. The cam follower selectively engages with the cam groove of one of the first cams, and the cam follower alternately engages with the cam groove of the rotating first cam. Accordingly, in the drive force conversion mechanism configured such that the drive lever reciprocates around its axis together with the output shaft, a pair of second cams provided on the axis of the input shaft so as to rotate together with the input shaft; , an actuating body that moves the drive lever in its sliding direction; and a second cam that is rotatably attached to the actuating body and that moves the actuating body along the axis of the output shaft under the action of the corresponding second cam. a pair of cam levers that alternately move in a direction along the sewing machine; and an actuator that alternately rotates both cam levers to a position where they are acted upon by the second cam or a position where they are not acted upon by the second cam. Driving force conversion mechanism.