JPS6161835B2 - - Google Patents

Description

[Detailed Description of the Invention] 3-1 Purpose of the Invention 3-1-1 Industrial Application Field The invention of this patent application (hereinafter referred to as the “Claim Invention”)
(abbreviated as ) is a knot formed when the needle thread accompanying the needle that moves up and down through the fabric intersects with the thread wound on the bobbin held inside the thread ring catcher that rotates below the needle. Regarding sewing machines that form lock stitches in fabric, in particular, when the bobbin is held in the thread ring catcher, the needle thread supply source (spool)
It relates to a means for supplying thread to a bobbin from another source different from that of the bobbin.

3-1-2 Conventional technology Conventionally, in order to replace, replenish, and supply thread on a bobbin, 1. either remove the bobbin and replace it with another bobbin pre-wound with thread, or insert thread onto the removed bobbin. I was wrapping it up and attaching it,
Since this method is extremely complicated, the following method has been proposed.

2. Like the inventions described in Japanese Patent Publication No. 36-9736 and others, the needle thread is supplied to the needle from the needle thread supply source (spool) without attaching or detaching the bobbin, and the needle thread protruding from the needle is captured, and the needle thread is A method has been proposed in which the needle thread is directed toward the bobbin and engaged with the bobbin, and the bobbin is rotated to wind the needle thread onto the bobbin.

However, in order to use this method to sew the type of seam thread under the fabric (color, thickness, material) that is different from the seam thread on the fabric, the thread from the first supply source must be applied to the needle. After removal, it is necessary to supply thread from another second supply source and wind it onto a bobbin, and then to supply thread from the first supply source to the needle, which is a complicated operation.

Therefore, in order to solve this complicated work, the following method was proposed for supplying thread to the bobbin from a source other than the needle thread.

3 The invention described in the Japanese Patent Publication No. 43-4828 is a spool 25 for supplying needle thread N to a needle 30.
The bobbin thread B is supplied to the bobbin 62 from a different spool 300 than the first one.
As shown in Figures 0 and 10A, at the end of the sewing cycle, the bobbin thread B-1 from the first stitch S-1 passes under the fourth stitch S-4 and becomes longer. It is connected to the spool 300 via the thread introduction finger 270. In other words, the bobbin thread B-1 is sequentially connected under many seams...for example, S1 to S4 while forming them, so when the workpiece W is fed to form the seams, the workpiece W is placed on it. Since the upper surface of the throat plate 20 and the bobbin thread B-1 rub, feeding of the workpiece W is inhibited.
This has resulted in the disadvantage that the seam formation is uncertain and its length is inaccurate.

3-1-3 Problems to be solved by the invention The present invention solves the above-mentioned conventional techniques 1, 2, 3,
This eliminates the troublesome work of replacing the bobbin, eliminating the need to replace the thread spool that is the supply source, and removing the thread by replacing it with the needle. To provide a sewing machine that accurately feeds cloth and accurately adjusts the length of seams without continuous bobbin thread below the seam line.

3-2 Structure of the Invention 3-2-1 Means for Solving Problems The structure of the present invention will be described below based on embodiments with drawings.

A bowl-shaped outer hook 4 that captures the thread ring 3 of the needle 2 is fixed to the outer circumferential surface of the lower shaft 1, which rotates around a horizontal axis below the sewing machine bed in conjunction with the source power of the sewing machine, such as a rotary motor. Rotatably supported.

A rod 5 is supported inside the lower shaft 1 so as to be able to slide back and forth on the axis of the lower shaft 1 through the rod 5, and inside the bowl of the outer hook 4 on the same axis as the rod 5, a rod 5 is fixed to the sewing machine bed. A bowl-shaped inner hook 8 is integrally formed with a flange piece 7 that fits into the inner hook stopper piece 6, and the outer hook 4 is attached to the inner circumferential surface of the outer hook 4 so that the outer hook 4 rotates. The bobbin thread is screwed onto the step screw 9 and supported with a gap left for forming a seam.
A movable shaft 5A is loosely fitted on the same axis inside the stepped screw 9 so as to be able to slide on the axis, and the inner hook 8 of the movable shaft 5A is sandwiched between the inner hook 8 and the outer circumferential surface on the opposite side from the outer hook 4.
A collar 10 integrally formed at the tip of the moving shaft 5A
A bobbin case 12 in which the bobbin is to be housed is fixed by a set screw 11 screwed into the tip of the stepped screw 9.

The bowl-shaped bobbin case 12 has an aperture 13 formed in the bottom of the bobbin case 12 that extends outward from the center of rotation, approaches the outer circumferential circle, and opens inwardly and outwardly in a vertical direction facing the outer circumferential circle.
At the edge, a notch 14 is formed by cutting out about 150 degrees of the center angle, leaving a part connected to the bottom, and a part of the outer periphery of the edge has an elastic force that presses the outer periphery in order to apply tension to the bobbin thread. Lower thread spring 12A with
to be fixed.

A stationary bobbin 17 is provided on the outer peripheral surface of a stepped portion 15 formed at the base of the stepped screw 9 on the opposite side from the collar 10 at the tip of the moving shaft 5A. It is supported rotatably and immovably in the direction of the center axis of the step screw 9.

The outer circumferential surface of the shaft portion 18 formed at the center of the bobbin case 12 and protruding inwardly has a
The movable bobbin 20, which has a collar 19 that loosely fits on the inner circumferential surface of the bobbin case 12, can be rotated, but cannot be moved in the direction of its central axis by an E ring 18a fitted on the outer circumference near the free end of the shaft portion 18 of the bobbin case 12. The bobbin 17 is supported oppositely to the stationary bobbin 17.

The stationary bobbin 17 is provided with a guide rod 21 protruding from its base toward the movable bobbin 20 in parallel to the axis of the movable shaft 5A, and an aperture that opens at the base of the movable bobbin 20 and faces the guide rod 21. 22 is loosely fitted into the guide rod 21, one end of the helical spring 23 is fixed to the base opposite to the movable bobbin 20, and the other end of the helical spring 23 is fixed to the base of the movable bobbin 20. The movable bobbin 20 is actuated to be drawn toward the stationary bobbin 17.

A stepped portion 20A is provided on the outer circumferential surface of the base of the movable bobbin 20 so as to form two steps inside and outside in the radial direction, thereby forming a thread holding portion.

As shown by the solid line in Figure 1, when rod 5 moves to the right,
Push the left end of the moving shaft 5A to move it to the left. When the rod 5 moves to the left, the right end of the rod 5 separates from the moving shaft 5A and moves into the lower shaft 1, as shown by the two-dot chain line in Figure 2. As the movable bobbin 20 and the bobbin case 12 move to the left due to the return pulling force of the helical spring 23, the left end of the shaft 5A is connected to the inner hook 8.
Stops without protruding beyond the left edge of.

On the outside of the bobbin case 12 on the opposite side from the movable bobbin 20, a rod 5 is arranged at a position opposite to the aperture 13 so as to be rotatable horizontally orthogonal to the central axis of the rod 5 and to be movable toward and away from the movable bobbin 20. A rotor 2 that can rotate in one direction around a shaft 24 that is
5 is provided, and the outer diameter and width of the rotor 25 are made large enough to be rotatable within the opening 13 of the bobbin case 12, and the outer peripheral surface of the rotor 25 is always spaced apart from the outer surface of the bottom of the bobbin case 12. Position to,
By moving the shaft 24 in the direction of the bobbin case 12, the collar 1 of the movable bobbin 20 is fitted into the opening 13.
Place related so that it comes in contact with.

The outer hook 4, the inner hook 8, the bobbins 17, 20,
On one side below the bobbin case 12, etc., the thread to be supplied to the bobbins 17 and 20 is wound and supports a supply source and a supply source 27A for supplying the thread to the needle 2,
A shaft 26A supported rotatably around an axis parallel to the central axis of the rod 5 is disposed on the opposite side of the supply source 27A with the bobbin case 12 in between, and a free end is provided on the outer peripheral surface of the shaft 26A. fixing the yarn feeding lever 26 extending toward the source 27A;
At the free end of the yarn feeding lever 26, a yarn feeding port 28, which is open to allow the bobbin yarn 27 of the supply source 27A to pass through, is provided on an arm 29 bent toward the bobbin case 12. 29 is rotatably arranged between a position between the bobbin case 12 and the supply source 27A and a position approaching the bobbin case 12.

A locking body 30 whose base is fixed to the machine frame and whose free end facing the bobbin case 12 is bent upward to have upward elastic force is provided between the shaft 26A and the bobbin case, and the upper surface of the locking body 30. A thread cutting body 31 which faces the bobbin case 12 and has a cutting blade and whose free end facing the bobbin case 12 is bent downward to have a downward elastic force; a locking body 30 and a thread cutting body 31
A cutting body 32 is sandwiched between the bobbin case 12 and the yarn feeding lever 26 by supporting the base thereof so as to be movable left and right, and having a free end movably between the bobbin case 12 and the yarn feeding lever 26.
The free end of the cutting body 32 is provided with an upward cutting part corresponding to the cutting blade of the thread cutting body 31 and an engaging part that crosses the bobbin thread 27 and captures it.

When the arm 29 at the free end of the lever 26 is rotated so as to approach the bobbin case 12, from the yarn feeder 28 to the part sandwiched between the locking body 30 and the cutting body 32, The continuous bobbin thread 27 enters the inside through the notch 14 of the bobbin case 12, which has moved to the right against the pulling elastic force of the helical spring 23 due to the rightward movement of the rod 5, and also enters the inside through the notch 14 of the bobbin case 12, which has moved to the right due to the rightward movement of the rod 5. They are arranged so as to fit into the gap below the portion 20A.

3-2-2 Effects of the Invention Since the present invention has the above configuration, it produces the following effects.

A After the sewing machine is stopped and the lower shaft 1 is stopped, when the rod 5 is moved to the right by an external force and stopped, the moving shaft 5 is moved as shown by the solid line in Figure 1.
A is pushed to the right and the collar 10 and set screw 11 sandwich the bobbin case 12 and the helical spring 2
At the same time, the moving bobbin 20 is also pushed by the E-ring 18a of the shaft portion 18 of the bobbin case 12, and the opening 22 is moved toward the guide rod 21 of the stationary bobbin 17.
The notch 14 of the bobbin case 12 emerges from the inner hook 8 to the outside, and stops.
The stepped portion 20A of the moving bobbin 20 is the stationary bobbin 1.
7 to the right to create a gap, and each of the above-mentioned parts maintains the above-mentioned state.

B When the yarn feeding lever 26 is turned and its shaft 26A is rotated clockwise, the arm portion 29 is rotated clockwise so as to approach the outer periphery of the bobbin case 12 as shown in FIG. The bobbin thread 27 is fed out from the supply source 27A toward the yarn feeder 28, and as shown in FIGS.
The bobbin thread 27 is cut and held under pressure by the locking body 30 and the cutting body 2, but the bobbin thread 27 from there to the thread feeding port 28 of the thread feeding lever 26 is
As the yarn feeding lever 26 rotates, the yarn passes through the notch 14 of the bobbin case 12 and enters the gap between the stepped portion 20A of the movable bobbin 20 and the stationary bobbin 17 below the stepped portion 20A, and the above-mentioned parts maintain the state of

C Next, when the rod 5 is moved to the left as indicated by the chain line in FIG.
It is pulled by the helical spring 23 and moves to the left, and its shaft portion contacts the E-ring 18a of the bobbin case 12 and stops, and the step portion 20A contacts the collar 16 of the stationary bobbin 17 and stops. The bobbin thread 27 between them is pinched by the pulling force of the helical spring 23.

When the shaft 26A of the rotor 25 is moved to the left,
The rotor 25 passes through the opening 13 of the bobbin case 12 and stops at a position where it contacts the collar 19 of the movable bobbin 20. Next, when the shaft 24 of the rotor 25 is rotated in one direction, the movable bobbin 2
6 also rotates the stationary bobbin 17 together with the guide rod 21 through its opening 22 in one direction, and the bobbin yarn 27 coming out from the supply source 24 is fed out from the yarn feeding port 28 of the yarn feeding lever 26, and is transferred to both bobbins. The ribs 17 and 20 are sequentially wrapped around the gap outside the stepped portion 20A between the ribs 16 and 19.

Further, when the bobbin case 12 moves to the left, the bobbin thread 27 connected from the thread feeder port 28 of the thread feeder lever 26 to the portion held by the locking body 30 and the cutting body 32 is moved by the bobbin thread spring of the bobbin case 12. It goes under 12A and is sandwiched between it and the outer peripheral surface of the edge.

D When the shaft 24 of the rotor 25 is rotated and its rotation is stopped, the rotor 25 moves to the right in FIG.
Move away from 9 and move to the right, bobbin case 12
It passes through the opening 13 and moves away to the right and stops.
Next, as shown in FIG. 3, when the shaft 26A of the yarn feeding lever 26 is rotated counterclockwise and stopped, the yarn feeding lever 26 is rotated counterclockwise and stopped. Further, when the cutting body 32 is moved to the left, the tip of the yarn feeding lever 26 crosses the bobbin thread 27 between the yarn feeding port 28 of the yarn feeding lever 26 and the bobbin thread spring 12A of the bobbin case 12.
Eliminate this and move further to the left while making contact on one side, then stop.

E When the cutting body 32 is moved to the right, its catching part captures the bobbin thread 27 that came in contact with it and still moves to the right, and when the cutting part and the thread cutting body 31 are engaged, both of them are attached to the bobbin thread 27 mentioned above. After cutting the thread 27, the vicinity of the cut end of the bobbin thread 27 from the thread feeder port 28 of the thread feeder lever 26 to the cutting body 32 is as follows:
Due to the elastic force of the locking body 30, it is held between the cutting body 32 and the locking body 30 and maintained.

3-2-3 Other Examples The bobbin was divided into two parts, a stationary bobbin 17 and a movable bobbin 20, and connected by a spiral spring 23. However, the bobbin was formed in a V shape, and the V-shaped part at the bottom was set at an acute angle. It is also possible to replace the bobbin by configuring a clamping part that ensures the engagement of the bobbin thread spring 1.
In order to ensure that the bobbin thread 27 is inserted under the bobbin thread 2A, a device is provided to lift the bobbin thread spring 12A, or the shaft 26A of the thread feeding lever 26 is moved to the right in the axial direction in FIG. , the bobbin thread 27 can be more reliably inserted under the lower thread spring 12A.

3-3 Effects of the Invention The present invention has the above-mentioned configuration and produces the above-mentioned effects, and therefore has the following effects.

When the bobbin thread 27 wound around the movable bobbin 20 is completely consumed, the bobbin is replaced with a bobbin wound with another thread, thereby eliminating the troublesome work of attaching and detaching both bobbins to a bobbin case, as in the prior art. I can do it.

In addition, in the conventional method of supplying thread from a supply source to a needle through a needle thread supply path and winding the thread onto a bobbin, the type of stitching thread under the fabric is different from the type of stitching thread on the fabric. Complicated work when sewing something different from the needle - Remove the thread from the needle and replace the thread supply with a different type of thread, or prepare another supply source in advance and use the thread from that other supply source. The thread is fed through the needle thread path to the needle, and the bobbin is rotated to wind the thread.
The problem of starting sewing after removing the thread from the needle and the needle thread path and feeding it to the needle through the needle thread supply source from the original supply source can be eliminated.

Furthermore, after winding the bobbin thread 27 around the movable bobbin 20, the bobbin thread 27 that protrudes from the bobbin case 12 toward the cutting body 32 is cut, so if the length is appropriately selected, the bobbin thread 27 can be cut at the beginning of sewing. In,
The vicinity of the thread end of the bobbin thread 27 passes through the needle thread ring, making it possible to reliably form the first stitch.
As in the invention described in Patent Publication No. 43-4828, it is possible to eliminate the drawback that the bobbin thread continues under each seam and obstructs cloth feeding.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the main parts, FIGS. 2, 3, and 4 are explanatory views showing the order of operations, and FIG. 5 is a perspective view of the bobbin case in the state shown in FIG. 2. Needle thread ring...3, Lower shaft...1, Outer hook...4, Inner hook...8, Inner hook shaft...step screw 9, Part of the inner hook...
...7, Bobbin case...12, Hole...13, Notch...14, Shaft...18, Bobbin case...2
0, Holding part...Stepped part 20A, Rod...5, Moving axis...5A, End part...Brim 10, Set screw...1
1, Rotor...25, Bobbin thread...27, Supply source...27A, Yarn feeder lever 26, Yarn feeder...28,
Arm part...29, Locking body...30, Cutting body...3
2.

Claims (1)

[Scope of Claims] 1. An outer hook fixed to the outer peripheral surface of a lower shaft that rotates around a fixed straight line so as to capture the needle thread ring and forming a bowl shape, and a shaft portion on the axis of the lower shaft. an inner hook whose outer edge fits loosely into the inner circumferential surface of the outer hook and a part of which is locked to the machine frame to form a bowl shape; It has a bowl-shaped shaft facing the inner pot and is housed in the inner circumferential surface of the inner pot, and has a linear opening at the bottom facing the outer circumference at a distance from the axis. , a bobbin case with a notch cut out at a central angle on the edge, and a bobbin case that is rotatable on the outer peripheral surface of the shaft of the bobbin case and moves along with the bobbin case so as to be accommodated inside the bobbin case. The movable bobbin is provided with a clamping part 20A and a collar 19 that can support the bobbin thread end, and the end of the movable bobbin is arranged such that the notch of the bobbin case and the clamping part of the movable bobbin protrude outward from the inner hook. The movable shaft is fixed to the bobbin case and supported inside the lower shaft and inner hook shaft so that it can move along their axes by external force. The rotor is rotatable around orthogonal axes and is movable so as to pass through an opening in the bobbin case and come into contact with the brim of the moving bobbin.The rotor is provided separately from the needle thread supply source to supply the thread to the bobbin. A notch in the bobbin case that approaches the bobbin case from a position between the bobbin case and the supply source and protrudes out of the inner hook, having an arm portion that has a supply source to hold and a yarn feeder that passes through the bobbin thread coming out from the supply source. A yarn feeding lever whose base end is rotatably supported around an axis parallel to the axis of the rod so as to guide the bobbin thread from the holding portion of the moving bobbin to the holding portion of the moving bobbin. The bobbin thread leading to the yarn feeder is provided with a catching part that intersects in the forward motion and captures it in the backward motion, and a cutting part that cuts the bobbin thread on one side by the backward motion, and cooperates with a locking body to cut the cut end on the other side. A bobbin thread replenishment device for a lockstitch sewing machine, comprising: a cutting body movable in a clamping manner;