CN1095006C

CN1095006C - Rotating shuttle device

Info

Publication number: CN1095006C
Application number: CN99102138A
Authority: CN
Inventors: 田岛郁夫
Original assignee: Tokai Kogyo Sewing Machine Co Ltd
Current assignee: Tokai Kogyo Sewing Machine Co Ltd
Priority date: 1998-02-16
Filing date: 1999-02-12
Publication date: 2002-11-27
Anticipated expiration: 2019-02-12
Also published as: CN1233681A; KR19990072631A; JPH11226284A

Abstract

The present invention provides a rotating shuttle device which can prevent excessive tension when an upper thread loop passes through a shuttle. The rotating shuttle device of a sewing machine comprises a rotating hook 10 which integrally rotates with a shuttle axis 20, a bobbin case holder 30 which is assembled so as to rotate with respect to the rotating hook 10, and a control member which controls rotation of the bobbin case holder 30 by butting an engaging part formed on the bobbin case holder 30. A center axis P of the rotating hook 10 and a rotating axis Q of the shuttle axis 20 are eccentricity arraigned so that the bobbin case holder 30 rocks vertically and horizontally with each rotating of the rotating hook 10.

Description

Rotating shuttle device

Technical field

The present invention relates to the shuttle-rotating device for sewing machine that bobbin case and shuttle frame can assemble pivotally relatively.

Background technology

As this rotating shuttle device, shown technology is well known on Fig. 7.This technology is: rotating shuttle device comprises bobbin case 70 and shuttle frame 74, and bobbin case 70 is fixed on and sewing needle (not shown) lifting action simultaneously on the rotating shuttle axle 72; Shuttle frame 74 relative bobbin cases 70 can be assembled in the bobbin case 70 freely to rotate; Be equipped with the shuttle housing (not shown) of bottom line shuttle in the inside of shuttle frame 74.And bobbin case 70 and shuttle frame 74 central axis and the axis of rotation of shuttle axle 72 separately is all consistent.In addition, formed joint portion 76, had the projection 82 of shuttle supporting 80 to be positioned on this joint portion 76 at the circumference of the front face side of shuttle frame 74.

In rotating shuttle device shown in Figure 7, when Sewing machines drives,, then shuttle frame 74 is often being acted on by making it to equidirectional rotating power with the friction of bobbin case 70 if bobbin case 70 is pressed arrow R direction and aforementioned shuttle axle 72 turns round integratedly.Therefore, when Sewing machines drove, shuttle frame 74 was often keeping the butt state of the one-sided wall 76a of its joint portion 76 to the projection 82 of shuttle supporting 80.Thereby, by bobbin case 70 by spur colluding pass through shuttle frame 74 around upper thread ring (not shown), when extracting out upward, will add bigger pulling force to this upper thread circulating application by aforementioned

joint portion

76 and 82 of projections, this has become the reason that breaks.

As the measure of avoiding these problems, have and use the person of mechanism who is called " shuttle opener ".This mechanism when extracting the upper thread ring out, forces shuttle frame 74 by the direction revolution opposite with arrow R among Fig. 7, can form the gap in aforementioned

joint portion

76 and 82 of projections.Successively, can not apply aforementioned pulling force by the opposite wire loop again.

But, state the occasion of " shuttle opener " before use, for making its action in the aforementioned moment, must setting at first be the complex mechanism of cam mechanism etc., Sewing machines has been maintained as problem.In addition, produce very big impact sound during owing to " shuttle opener " work, it is big that the Sewing machines noise becomes, and working environment has also become problem.

Summary of the invention

The objective of the invention is to not use " shuttle opener " with bad problems such as mechanism's complexity and noise are big, and provide a kind of when shuttle is extracted the upper thread ring out, prevent to produce the rotating shuttle device of excessive pulling force.

By the invention that the present invention program 1 is recorded and narrated, this rotating shuttle device includes bobbin case, shuttle frame and limiting member, wherein, bobbin case and the revolution of shuttle axle one, shuttle frame bobbin case relatively assembles pivotally; Limiting member is by the withstand effect of the joint portion that forms on the shuttle frame, the revolution of restriction shuttle frame; Simultaneously, make the axis of rotation off-centre of the central axis of aforementioned bobbin case to aforementioned shuttle axle, bobbin case is whenever goed around, and the shuttle frame is done oscillating motion up and down; The eccentric direction of the central axis of its bobbin case and shuttle axle axis of rotation is set at this axis of rotation and leaves central axis colludes extension usefulness spur side for deflection bobbin case upper thread direction.

Like this since with the revolution interlock of bobbin case, the shuttle frame is done oscillating motion, has produced in order to extract the gap of upper thread ring out between the joint portion of this shuttle frame and aforementioned limitations member, can prevent to act on the upper thread ring excessive pulling force.Thereby, can not re-use mechanism's complexity, " shuttle opener " that noise is big, and eliminate a reason of broken string.

In 1 of bobbin case changes, produce the moment in gap between aforementioned joint portion and limiting member, can just in time match from the moment that shuttle is extracted out with the upper thread ring.

The invention of being recorded and narrated by the present invention program 2 is on the basis of the rotating shuttle device recorded and narrated in scheme 1, makes axis this bobbin case central axis off-centre relatively of the installing hole of the bobbin case that is incorporated into aforementioned shuttle axle.

According to this invention, only taked to make its installing hole axis to the eccentric so simple measure of bobbin case central axis in the bobbin case side, can reach aforesaid purpose.

The invention that the present invention program 3 is recorded and narrated is on the basis of the rotating shuttle device recorded and narrated in scheme 1, makes the axis of aforementioned bobbin case installing hole consistent with the bobbin case central axis; On the other hand, make the shuttle axle that is incorporated into this installing hole in conjunction with the axis of rotation off-centre of axial region to this shuttle axle.

At this moment, aforementioned in conjunction with the such measure of axial region owing to having taked to form in shuttle axle side, shuttle itself still can use existing thing.

Description of drawings

Fig. 1 is the front view of rotating shuttle device; Fig. 2 is the back view of same rotating shuttle device; Fig. 3 is the A-A cutaway view of Fig. 1; Fig. 4 is the front view of expression rotating shuttle device open mode; Fig. 5 is the key diagram of the time diagram of expression rotating shuttle device, shank and crossbeam; Fig. 6 is the sectional drawing with the corresponding expression with Fig. 3 of rotating shuttle device of embodiment 2; Fig. 7 is existing rotating shuttle device front view.

The specific embodiment

The following describes embodiments of the invention.

Embodiment 1

Fig. 1 is the front view of rotating shuttle device; Fig. 2 is the rearview of same rotating shuttle device; Fig. 3 is the A-A cutaway view of Fig. 1.As shown in these figures, assembling shuttle frame 30 rotatably in the inside of bobbin case 10.On the integrally formed wheel hub 12 in these bobbin case 10 back sides, formed installing hole 14.This installing hole 14, the lifting action while of the shank (not shown) when driving with Sewing machines, insert wherein the end of rotating shuttle axle 20, and integrally combine with wheel hub 12.At the front face side circumference of bobbin case 10, formed in order to collude the spur of upper thread ring.

On the other hand, in the centre of aforementioned shuttle frame 30, integrally formed mandrel 32, this mandrel 32 is in order to the supporting shuttle sleeve, and the bottom line shuttle can be contained in (all not shown among these figure) in the shuttle sleeve freely to rotate.The axis of this mandrel 32 is concentric with the central axis P of bobbin case 10, the only eccentric each other X of the axis of rotation Q of this central axis P and aforementioned shuttle axle 20.In the present embodiment, aforementioned installing hole 14 is formed on the position of the eccentric X of the relative central axis P of its axis (being the axis of rotation Q of shuttle axle 20).This offset X specifically is set at about 0.25mm; Simultaneously, eccentric direction fixes on the direction of aforementioned axis of rotation Q from spur 16 1 sides of central axis P deflection bobbin case 10.

Fig. 4 is the front view of expression rotating shuttle device open mode.Also can see clearly from this drawing,, form the joint portion 34 of the notch geometry that outside it, cuts out in week in thoughtful at the circumference of the front face side of aforementioned shuttle frame 30.With respect to this joint portion 34, the projection 42 that is fixed on the shuttle supporting 40 on the Sewing machines static part has regulation at the gyratory directions of shuttle frame 30 and combines more than neededly.

When Sewing machines drives, bobbin case 10 is pressed the direction revolution of Fig. 4 arrow R by shuttle axle 20, shuttle frame 30 also and the friction between the bobbin case 10 to the related revolution of same direction, but when the projection 42 of the one-sided wall 34a of aforementioned joint portion 34 and shuttle supporting 40 connects, stopped revolution.Thereby, 42 one-tenth of the projections of this shuttle supporting 40 rotating " limiting member " of restriction shuttle frame 30.

Fig. 5 is the key diagram that the time diagram of the time diagram of rotating shuttle device and shank and crossbeam is together represented.It mainly is the effect that rotating shuttle device is described by Fig. 5.The transverse axis of this Fig. 5 is the angle of revolution of machine spindle, and the machine spindle shank of going around is once reciprocal, and the top dead-centre of shank has become 0 ° of the angle of revolution of machine spindle.On the other hand, the bobbin case 10 of rotating shuttle device is in once back and forth commentaries on classics 2 commentaries on classics between (machine spindle 1 changes) of shank.Be set at machine spindle from the bottom dead centre of shank and then change moment about 20 °, spur 16 wire loop above top dead-centre colludes of bobbin case 10, therefore, the lagged behind phase place of about 20 ° of machine spindle angles of revolution of bobbin case 10 relative shanks.

Since aforementioned such, the axis of rotation Q off-centre of the central shaft P of bobbin case 10 and shuttle axle 20, the 10 one-tenth circular runout states revolutions of bobbin case by shuttle axle 20 drives are accompanied by this motion, and bobbin case 10 is whenever goed around, the motion that shuttle frame 30 promptly shakes up and down.Because this motion, main shaft gyration angle shown in Figure 5 is from a to b.Form the gap between the projection 42 of the one-sided wall 34a of aforementioned joint portion 34 and shuttle supporting 40.And, thisly act on the angle of revolution c from machine spindle shown in Figure 5 to also producing d, but do not utilize them.

Aforementioned angle of revolution a is near 344 °, and angle of revolution b is near 50 °.In addition, about the upper thread ring by between aforementioned joint portion 34 and the projection 42, moment of Chou Chuing upward, some changes a little according to the setting of take-up action (flat scale), but in the angle of revolution of machine spindle on Fig. 5 (shank is crossed near the top dead-centre slightly) near 10 °.Since this be constantly at angle of revolution a to the scope of b in, have the gap as shown in Figure 4 between the one-sided wall 34a of joint portion 34 and the projection 42, the upper thread ring is not released with can having any obstruction, has eliminated a reason that breaks.

Embodiment 2

Fig. 6 is with the rotating shuttle device of embodiment 2 and the sectional drawing of the corresponding expression of Fig. 3.In present embodiment shown in Figure 6, make the axis of the installing hole 15 that forms in the wheel hub 12 of bobbin case 10 concentric with the central axis P of bobbin case 10, thus, shuttle itself is still in statu quo.To this, in the end of shuttle axle 22, formed leave this shuttle axle 22 axis (axis of rotation Q) only eccentric X in conjunction with axial region 24.This inserts installing hole 15 in conjunction with axial region 24, and combines with wheel hub 12 one.

As a result, the same with embodiment owing to taked measure in shuttle axle 22 1 sides, also make the central axis P of bobbin case 10 and the axis of rotation Q off-centre X of shuttle axle 22.And this offset X is the same with embodiment 1 with eccentric direction.Thereby the rotating shuttle device of embodiment 2 also has function similarly to Example 1.

Claims

1. rotating shuttle device, it has bobbin case, shuttle frame and limiting member; Wherein, bobbin case and shuttle axle turn round with being integral; Shuttle frame bobbin case relatively assembles pivotally; Limiting member can limit the revolution of shuttle frame by being formed at the withstand effect of the joint portion on the shuttle frame; It is characterized in that make the axis of rotation off-centre of the central axis and the aforementioned shuttle axle of aforementioned bobbin case, bobbin case is whenever goed around, the shuttle frame is done oscillating motion up and down; The eccentric direction of the axis of rotation of the central axis of bobbin case and shuttle axle is set to: this axis of rotation colludes the direction of the most advanced and sophisticated side of hanging usefulness from the upper thread on the central axis deflection bobbin case.

2. the rotating shuttle device of recording and narrating by claim 1 is characterized in that, is incorporated into the relative central axis off-centre of this bobbin case of axis of installing hole of the bobbin case of aforementioned shuttle axle.

3. the rotating shuttle device of recording and narrating by claim 1 is characterized in that, the axis of the installing hole of aforementioned bobbin case and the central axis of bobbin case are consistent, on the other hand, be incorporated into this installing hole the shuttle axle in conjunction with the axis of rotation off-centre of axial region from this shuttle axle.