JPS58169486A - Stitch line forming mechanism of cycle sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a stitch forming mechanism for a cycle sewing machine.

When sewing a label as shown in Figure 1, if the 1st to 6th stitches are in the normal feed state, the 1st to 6th stitches will be part-eft stitches, but the 12th to
Up to the 16th stitch, the reverse feed state occurs and a hit stitch is formed, and from the 7th m+-11th stitch, the 17th gold stitch to the 20th stitch, the forwarding state is between normal forwarding and reverse feeding. Depending on the condition, either a vertical stitch or a pitch stitch is formed arbitrarily.

For this reason, the label sewing stitches are not all barfect stitches, but are irregular stitches that are a mixture of barfefect stitches and pitch stitches, which has the disadvantage of lowering the quality of the sewn product. .

The object of the present invention is to provide a seam forming mechanism for a Yaikuru sewing machine that can eliminate such drawbacks.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIGS. 1 to 8, l is an outer hook fixed to the machine frame below the throat plate, 2 is a thread w4 catcher supported rotatably about a fixed axis in the outer hook 1, and A thread ring catcher 20 is detachably mounted in the running groove.

This thread ring catcher 2 is attached to the main shaft (not shown) of the sewing machine.
A driver 6 provided at the tip of a rotating shaft 4 interlocking with the needle rotates the needle reciprocally in synchronization with the vertical movement of the needle.

Reference numeral 6 denotes a movable body that is in contact with the upper part 8a of the inner hook holder 8 and is movable in the horizontal direction.The movable body 6 is supported on the machine frame by step screws 8 inserted into long holes 7 opened on both sides of the movable body. It is a locking part provided in the center.

1O is a bobbin case rotatably supported on the central axis gm of the thread ring catcher, and a corner 11 protruding from the outer periphery of the bobbin case engages with a locking part 9 of the movable body 6 to prevent the bobbin case from moving around. .

12 is the bobbin thread TH attached to the outer peripheral surface of the bobbin case IO.
A leaf spring 18 is opened at the tip of the corner 11 of the bobbin case 10, and the lower thread TB exits from the bobbin case 10. 14 is a needle through hole opened at the top of the outer hook l. , 15 is a thread handling piece attached to the upper part of the outer hook l, and an opening 15b facing the needle through hole 14 and forming a thread handling part 15& is formed in the center. Zaba the thread TB.

Reference numeral 16 denotes a known feed cam that rotates in conjunction with the main shaft (not shown) of the sewing machine (see Fig. 8).This feed cam 16 has a certain cam portion (not shown) formed therein. A known holder 1 (not shown), which holds the workpiece W on the sewing section of the sewing machine, is moved back and forth and left and right to form a cycle stitch line on the workpiece W, which is scheduled to have a certain number of stitches. It is supposed to form.

17 is a rotating lever rotatably supported on a shaft 18 supported on the machine frame; 19 is an engagement pin formed at the tip of the rotating lever 17 so that it can be held on the outer peripheral surface of the feed cam 16; An elastic force (not shown) acts in the direction in which the engagement pin 19 contacts the outer periphery mI of the feed cam 16.

Reference numeral 80 denotes a connecting link rotatably supported by the base end of the rotary lever 17 and the movable body e.

A reference cam surface portion 2 is provided on the outer peripheral surface of the feed cam 16.
1. The convex cam surface sI8 and man of the knee are formed higher than the upper surface of the reference cam surface section 11 by MIIC formation. is in contact with the reference cam lf17Mgl, the lower thread outlet 18 of the bobbin case IO is located at a position overlapping the needle drop path of the needle N when viewed from the front of the bobbin case 10, and the retaining bin 1g is in the concave cam portion. sl, the lower thread outlet 1B of the bobbin case 10 is on the left side of the needle drop path of the needle N when viewed from the front of the bobbin case IO, and the retaining pin 10 is on the convex cam surface portions g8A, jl1.
When the lower thread outlet 1B of the bobbin nurse 10 is in contact with the bobbin case 10, the lower thread outlet 1B of the bobbin nurse 10 is positioned on the right side of the bobbin case 1O.

Next, the present invention will be explained in detail.

When the sewing machine is started, the feed cam 16 rotates counterclockwise, and the rotation of the feed cam 16 causes the needle to move from the first needle to @6.
Until it reaches the needle, a holder m (not shown) normally feeds the workpiece in the direction of arrow X in FIG.

In the normal feeding state, the movable body 6 does not operate because the retaining bin 19 is in contact with the reference force surface portion z1 of the feeding cam 160.

As shown in FIG. 4, in the state of normal feeding (direction of arrow (The lower thread Tll is located on the left side of the needle N.) Since the upper thread loop is formed in front of the lower thread Tl, a knot of a par 7 exact stitch, which is a regular stitch, is formed.

Then, when the feed cam 16 further rotates L and changes to the feed direction constituting needles 7 to M11 as shown in FIG. (Y1 direction), and it becomes unstable whether a par 7 etato stitch or a hit stitch will be formed.

In this intermediate feeding state, due to the rotation of the feed cam 16, the locking pin 19 comes into contact with the concave cam surface 3S of the feed cam 16, so the synchronized lever 1? rotates clockwise to move the movable body 6 to the left in FIG. 8 via the connecting link 80.

By moving the moving body 6 in the left direction, the ivth! As shown in J, the bobbin case 10 rotates counterclockwise.

As a result, the bobbin thread outlet 1B opened at the tip of the corner 11 of the bobbin case IO moves to the left of the needle N in FIG. It is located behind the needle N with respect to the capture direction 2.

For this reason, the upper thread loop is formed forward of the lower thread Tll, and as shown in FIG. 7, a knot of a par 7 Exi stitch, which is a regular stitch, is formed in the same way as in normal feed.

Next, the feed cam 16 further rotates, and the 11th feed cam shown in FIG.
The case of configuring the needles to the 16th needle will be explained.

In this case, the state of intermediate feeding changes and the feeding direction becomes a feeding direction (direction of arrow P) opposite to the normal feeding direction.

In the reverse feeding direction P, the catching direction Z of the yarn W4 catching body S
Contrary to normal feeding, the bobbin thread Tl is always located in front of the needle N with respect to the IC, and the needle thread loop is formed behind the bobbin thread T1, forming a knot in the pitch stitch. However, even in the reverse feed direction P, the retaining bin 19 is moved by the feed cam 16.
Since the movable body 6 also contacts the concave cam surface part ms of #l! sW
J Move to the left.

Therefore, as described above, the bobbin case 10 rotates counterclockwise, and as a result, the bobbin thread outlet 18 opened at the tip of the corner 11 of the bobbin case 10 moves to the left of the needle N at the eighth point. #I8 As shown in figure I8, the bobbin thread B is located behind the needle N in the catching direction 2 of the thread ring catcher. Therefore, the needle thread loop is formed in front of the bobbin thread T1, which is similar to normal feeding. A knot of a par 7 etato-o stitch, which is a regular seam, is formed.

Next, when constructing the Jno needle from the 17th needle shown in Fig.
2 directions), and the feed is in an unstable state as to whether perfect stitch or pitch stitch will be formed.

Even in the case of this intermediate feed, the holding bottle 1g comes into contact with the concave cam surface 3z of the feed cam 16, so the seventh needle to the first needle
As in the case of configuring one stitch, the movable body 6 moves to the left, and as shown in FIG.
It is located at the rear with respect to the acquisition direction 2 of . This creates a perfect stitch knot as before. Then, the feed cam 16 further rotates counterclockwise, and the 8 stitches before the final needle 38, that is, the 31st stitch to ##
! 28 stitches are sewn, and when the 1st stitch (31st stitch) and 3rd stitch (1S needle) of this tacking stitch are reached, the retaining pin 19 closes the three holes formed on the outer circumferential surface of the feed cam 16. Since the convex cam surface contacts the 8th m and s31, the 81st needle i
Every time the s needle is sewn, the rotating lever 2 rotates counterclockwise in FIG. .

This rightward movement of the movable body 6 causes the bobbin case IO to rotate clockwise as shown in FIG. 1θ. Then, the bobbin thread outlet 1B opened at the tip of the corner 11 of the bobbin case 10 moves to the right of the needle N in FIG. It is located behind the needle N with respect to the capture direction 2 of the needle N.

For this reason, the upper thread loop is formed behind the lower thread TB, so the lower thread TB is caught in a twisted state by the upper thread TN as shown in R11l, and the knot of the pitch stitch is formed in the 21st gold 1. It is formed continuously on the 21st needle.

Then, the needle falls onto the S@ needle, which is the 8th needle, and the upper and lower threads are cut, forming a complete knot that cannot be unraveled by the two pitch stitches.

Incidentally, although a vertical pot was used in this Embodiment '-No.4, a horizontal pot may be used instead. In addition, in the case of a well-known hook consisting of a thread ring catcher, an inner hook rotatably supported within the thread ring catcher, and (11) a bobbin case installed in the inner hook, the inner hook tl-me can be moved. It can be used in place of the body and operate as in the previous embodiment. Further, in this embodiment, a half-rotation hook has been described, but a full-rotation hook may also be used.

As described above, according to the present invention, when the bobbin case is not normally fed, the bobbin thread is drawn out [-1] by the movable body that operates in conjunction with the back and forth and left and right movement of the holding device. By doing this, I formed a parts eft stitch, so I formed a perfect stitch for both the forward and reverse feeds, so I was able to create beautiful stitches that lined up in one part eft stitch [ 1 can be obtained and the quality of sewn products can be improved.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of nail drop in label sewing, Fig. 2 is a partial perspective view of a mechanism according to an embodiment of the present invention, Fig. 3 is a front view of a mechanism according to an embodiment of the present invention, and Figs. 4 to 10. The figures are partial perspective views showing the process of forming pitch stitches and par (12) fect stitches, respectively. 2... Thread ring catcher 6... Moving body 10... Bobbin case 13... Lower thread lead-out [I 22... Four cam surface parts 23A, 23B... Name of convex cam surface part agent Patent Attorney Nagoya - Yukoko

Claims (1)

[Scope of Claims] A thread ring catcher supported below a needle plate having a needle hole and capable of swinging or rotating about a fixed axis in synchronization with the vertical movement of a needle holding an upper thread; and a bobbin thread. a bobbin case that is swingably mounted inside the thread ring catcher and has a bobbin thread outlet from which the bobbin thread comes out; a holding mechanism that is connected to the holding mechanism and rotates in conjunction with the rotation of the main shaft so as to form a scheduled cycle stitch line consisting of a fixed number of stitches on the workpiece with the upper thread and the bobbin thread; A cycle sewing machine equipped with a feed cam having a cam portion that moves back and forth and left and right, and which engages with the bobbin case and is movably supported on the machine frame so that the bobbin case swings about a rotation axis. When the movable body and the workpiece are in a state other than normal feed, position the needle hole and the bobbin thread of the bobbin case on one side with respect to the needle movement path so that the stitches become part-free stitches. a cam surface part formed on the feed cam and linked to the movable body to move the movable body so as to guide the lower thread outlet of the bobbin case to one side with respect to the movement path of the needle; Formation mechanism.