JP2855060B2 - Sewing machine bobbin and bobbin thread automatic feeding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a sewing machine bobbin and
The present invention relates to a lower thread automatic supply device .

[0002]

2. Description of the Related Art In the case of a conventional lockstitch sewing machine, when the bobbin wound around the bobbin runs out, the bobbin is removed together with the bobbin case from the shuttle, the bobbin is wound around the bobbin, and the bobbin is attached to the shuttle again. Or a work to replace the bobbin with a wound bobbin prepared in advance has been performed. However, since the work requires a lot of time and labor, for example, JP-A-61-168387 Gazette, JP-A-61-16
Japanese Patent Application Laid-Open No. 8388, Japanese Patent Application Laid-Open No. S61-168389, and the like have proposed various devices for automatically winding a bobbin on a bobbin.

[0003]

However, the above proposed device has the following problems. That is,
In these devices, a special shape different from the conventional bobbin case and bobbin must be used. For this reason, the bobbin and the bobbin case have special shapes, and the entire apparatus has a complicated mechanism, resulting in a problem of high cost.

Accordingly, the present invention provides a bobbin of a sewing machine in which a thread is wound on a bobbin automatically by only making a slight change to a conventional bobbin, thereby maintaining good sewing quality.
The first purpose is to do so.

[0005] The present invention also provides a conventional bobbin with a small amount.
Simply make changes and the bobbin is automatically wound
Are, together with the sewing quality is well maintained, the apparatus overall simple structure, and that you provide a lower thread automatic supply apparatus cost can be reduced second object.

Further , the present invention relates to a conventional bobbin case.
The bobbin case is automatically threaded without any changes
This ensures that the sewing quality is
Bobbin thread automatic feeder with simple structure and low cost
The third object is to provide

[0007] The present invention also relates to a threaded bobbin.
The supply yarn to the case is automatically cut with a simple configuration.
It is a fourth object of the present invention to provide a bobbin thread automatic feeding device.
You.

[0008]

Means for Solving the Problems The first object is achieved.
The bobbin of the sewing machine of the first invention
Vignetting with winding bobbin thread on the shaft itself is rotated, the bobbin of the sewing machine in which the lower thread wound is accommodated in the bobbin case at the time of stitch formation is decremental <br/>, release from the shaft portion
A thread hooking member that protrudes in the shooting direction and has a key
At the start of bobbin winding as the bobbin rotates for bobbin winding
The thread catching member catches the thread end of the lower thread to be wound around
It is characterized by being wound around.

In order to achieve the first object, a second
The bobbin of the sewing machine according to the present invention includes, in addition to the first aspect, a shaft portion.
At a position close to the radial extension of the thread hooking member.
It is characterized by forming a V-shaped groove along the direction.
You.

In order to achieve the second object, a third
The automatic bobbin thread feeding device according to the invention has a bobbin having an opening at a peripheral edge.
A bin case and a thread that can be stored in this bobbin case
A thread hooking member is formed to project radially from the shaft to be wound.
Bobbin and the bobbin housed in the bobbin case.
A thread winding hand that can be rotated about the same axis as the bobbin
Bifurcated to hold the yarn to be wound crossing the step
Part is formed at the tip, and the forked part is separated from the bobbin case.
From the initial position, and into the bobbin case opening.
An operation position that enables the yarn hooking member to be able to face the moving path;
The thread hooking means,
When the step is in the working position, the bobbin winding means provides
By rotating the bin, the yarn held by the forked portion
Is wound after being captured by the thread hooking member.
And

In order to achieve the third object, the fourth object
Lower thread automatic supply apparatus of the invention has opened the one axial off
Open in one of the frame and the axial direction and bend in a substantially L-shape.
A slit groove formed on the peripheral edge of the frame;
Outer periphery of the frame so as to cover an intermediate portion of the slit groove
A bobbin case having a thread tension leaf spring fixed to a side edge,
Shaft that can be housed in this bobbin case and winds the yarn
And a bobbin holding the bobbin case and holding the bobbin.
Connected to the bobbin housed in the case and coaxial with the bobbin
A thread winding means rotatable about
The bobbin in the bobbin case is rotated by the winding means
Is supplied from the lower thread supply means to the shaft portion of the bobbin.
In the automatic lower yarn feeding device for winding the
Wound around the bobbin in the case and connected to the lower thread supply means.
The bobbin case so that it can engage with the thread outside the bobbin case.
Yarn guide means arranged close to the outer periphery of the bin case, and this yarn plan
The thread engaged by the inner means is moved from the open end of the slit groove.
And fitted after inserted between the plate spring and said slit groove in so that to guide the slit groove tip, the bobbin case
The bobbin in the circumferential direction, the axial direction, or the combined direction thereof
Moving means for relatively moving the case and the yarn guiding means
And with.

In order to achieve the third object, the fifth object
The automatic lower thread supply device according to the invention further includes a thread
The guide means is wound around the bobbin in the bobbin case and
Engage with the yarn connected to the feeding means outside the bobbin case
A guide is provided as close to the outer periphery of the bobbin case as possible.
The bobbin case has a circumferential direction and an axial direction, and
The moving means can be moved along the combining direction,
Insert the thread engaged by the body from the open end of the slit groove
From the slit groove and the leaf spring
Bobbin casing so that the yarn guiding means is guided to the tip of the groove.
Movement in the circumferential or axial direction of the
It is characterized by that.

In order to achieve the fourth object, the sixth object
The automatic lower thread supply device according to the invention further includes a thread
A movable blade which constitutes a thread cutting means is formed in the guide means,
A fixed blade constituting the thread cutting means is held by the thread winding means.
Fixed to the machine frame close to the bobbin case
When the step moves relatively beyond the range of movement, the lower thread
Characterized by cutting the yarn between the supply means and the bobbin
ing.

In order to achieve the third object, the sixth object
The automatic lower thread feeding device according to the present invention is the same as the fourth invention, except that
Tension application to apply a certain tension to the yarn during pair movement
It is characterized in that means are provided.

[0015]

According to the bobbin of the sewing machine of the first aspect,
If the end of the lower thread to be wound at the start of
Radiation from the bobbin shaft as the bobbin rotates for
Captured by a thread hooking member that protrudes in the
It is caught and wound around the bobbin shaft. Such a bo
The bins are slightly modified from conventional bobbins.

In the bobbin of the sewing machine according to the second aspect,
According to this, it is located close to the radial extension of the threading member.
V-shaped groove formed on the bobbin shaft along the radial direction
On the other hand, the tip of the lower thread captured by the
Attached. Such bobbins are slightly less than conventional bobbins.
We just made changes.

The lower thread automatic feeding device according to the third aspect of the present invention.
According to the above, the yarn hooking means is formed so as to protrude from the bobbin shaft.
Located in the opposing position of the hanging member on its movement path
The bobbin is rotated by the bobbin winding
Therefore, the yarn held by the forked portion of the yarn hooking means
After being captured more, it is wound around a bobbin shaft. This
Una bobbin is a small change to the conventional bobbin
Yes, and the device configuration is simple.

In the fourth and fifth aspects of the present invention, the lower thread automatic supply
According to the feeding device, it is wound around the bobbin in the bobbin case and
The yarn connected to the yarn supply means is bobbin
The thread guide means
After the thread is inserted through the open end of the slit groove,
Between the slot groove and the leaf spring to guide to the tip of the slit groove
Moving means, around the bobbin case
With the bobbin case in the
The yarn guide is moved relatively to the bobbin case.
Threading is performed. Such bobbin cases have strange
No further changes have been made and the device configuration is simple.
You.

The automatic lower thread feeding device according to the sixth aspect of the present invention.
According to the above, the yarn guide means moves relatively beyond the range of movement.
The thread was hooked on the bobbin case
The thread between the lower thread supply means and the bobbin is formed on the thread guide means.
Is cut between the movable blade thus set and the fixed blade fixedly arranged on the machine frame. Such a device configuration is simple .

[0020] Such a lower thread automatic supply device of the seventh invention.
According to the above, during the relative movement, the tension is applied to the yarn by the tension applying means.
A predetermined tension is applied to keep the lower thread tension constant.
The bobbin case is threaded properly.
Become so.

[0021]

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of a lower thread automatic supply device and a bobbin changing device to which the lower thread automatic supply device according to an embodiment of the present invention is applied. In FIG. 1, a lower shaft 3 is connected to a shuttle 2 disposed directly below a needle plate 1 of the sewing machine, and a bobbin case 4 is housed in the shuttle 2. Further, in the bobbin case 4, a bobbin 5 on which a lower thread is wound by a lower thread automatic supply device 100 described later is stored. As the shuttle 2 and the bobbin case 4, a conventional structure having a normal structure is used without being deformed. Therefore, detailed description of these structures is omitted.

A bobbin case automatic supply device 100 for automatically winding the bobbin 5 and threading the bobbin case 4 is provided below the shuttle 2 in the figure, and a bobbin case accommodated in the shuttle 2 is provided at the lower right. A transfer mechanism 7 as a bobbin exchange device for holding a new bobbin case 4 prepared in the bobbin thread automatic feeding device 100 and mounting the same in the hook 2 while grasping and removing the bobbin from the inside of the hook 2 is provided. I have.

Hereinafter, first, the lower thread automatic supply device 100 will be described. FIG. 2 shows an automatic lower thread feeding device 10 shown in FIG.
0 is an enlarged cross-sectional view, FIG. 3 is a view taken along the line XX of FIG. 2, and FIG. 4 is a plan view of the cylindrical grooved cam, the bobbin case, and the thread handling plate of FIG. For convenience of explanation, the automatic lower thread supply device 100 shown in FIG. 2 is drawn upside down and further inverted from the automatic lower thread supply device 100 shown in FIG.

In FIG. 2, reference numeral MC denotes a winding motor, and a motor shaft M of the winding motor MC is shown.
A clutch shaft 17 is fixed to the tip of C1. The clutch shaft 17 is rotatably fitted in a bearing 20 fixed to a base 21, and a clutch board 17 a detachably attached to the bobbin 5 is provided at a tip end thereof. These volumes
Scraping motor MC, clutch shaft 17, clutch board 17a
The winding means (including the tension applying means) is constituted by
I have. A spline shaft 22 is rotatably fitted on the bearing 20. A spline groove 22 a is formed on the outer periphery of the spline shaft 22 along the axial direction. A driven gear 9 is provided at an end of the spline shaft 22 on the winding motor MC side, and a driven gear 23 is meshed with the driven gear 9. The drive gear 23 is fixed to a motor shaft MR1 of the yarn guide mechanism drive motor MR, and the yarn guide mechanism drive motor MR is capable of reversible rotation.

A spline nut 24 in which a spline corresponding to the spline groove 22 a is formed on an inner periphery of the spline shaft 22 is fitted around the outer periphery of the spline shaft 22. Therefore, the spline nut 24 is rotatable by the yarn guide mechanism drive motor MR, and is capable of moving forward and backward in the axial direction by the spline. Spline nut 24
The other end of a coil spring 25 having one end fixed to the end surface of the spline shaft 22 on the bobbin 5 side is fixed to the end surface on the bobbin 5 side, and the spline nut 24 is attached to the winding motor MC side by the coil spring 25. It is being rushed. On the outer peripheral surface of the spline nut 24, a cam follower pin 29 and a thread handling plate (plan ) protruding outward (upward in FIG. 2).
Inner means) 30 are fixed respectively. This thread handling plate 30 is obtained by bending a flat plate into an arc shape as shown in FIG. 3, and the end portion thereof is connected to a bobbin 5 as shown in FIG.
Extending to the side of.

As shown in FIG. 4, the thread handling plate 30 has a substantially L-shape when expanded and shown, and a main portion thereof is fixed to the spline nut 24 to form an L-shape. The extending portion 30a, a thread trapping portion 30b formed in a key shape at the intersection of the L shape, the other extending portion 30c forming the L shape, and the thread formed on the other extending portion 30c A guide groove 30d, a movable knife portion 30e (see FIGS. 3 and 5) serving as a movable blade provided on the bobbin case 4 side at the V-shaped crotch portion formed by the yarn guide groove 30d, and the other extension. A flat-plate-shaped thread end pressing leaf spring portion 30f formed along the circumferential direction at the end of the portion 30c and standing outward (see FIG. 3,
5) and an inclined portion 30g which is connected to the thread end pressing leaf spring portion 30f and facilitates guiding the lower thread upward in FIG.

As shown in FIG. 3 and FIG. 7, a fixed knife 37 as a fixed blade whose end is fixed to the base 21 is arranged inward along the circumferential direction of the thread handling plate 30. . The position of the distal end of the fixed blade 37 is opposite to the position of the movable blade 30e at the time when the thread hooking on the bobbin case 4 is completed (details will be described later).
The bobbin thread is cut between the distal end and the movable blade 30e.

On the other hand, a hollow cylindrical outer cam 26 fixed to the base 21 is disposed outwardly along the circumferential direction of the thread handling plate 30 and the spline shaft 22. An opening is formed in the outer cam 26 as shown in FIG.
Is arranged. The inner cam 27 is fixed to the base 21 by a support plate 28, and a cam groove 33 is formed by the outer cam 26 and the inner cam 27. The cam follower pin 29 is loosely fitted in the cam groove 33, so that the cam follower pin 29
When the thread guide mechanism drive motor MR is driven, the yarn guide mechanism moves in the cam groove 33 by being restrained by the spline and the cam groove 33 described above. Here, the yarn guide mechanism
Drive motor MR, driven gear 9, drive gear 23, splice
Shaft 22, spline groove 22a, spline nut 2
4, coil spring 25, cam follow pin 29, base 2
1, outer cam 26, inner cam 27, support plate 28, cam groove 33
The moving means is constituted by.

The branch portion of the cam groove 33 has an inner cam 27
Non-return guide valves 32A and 32B are rotatably supported by the crane springs 32a and 32b attached to the non-return guide valves 32A and 32B. This has been done (details will be described later).

As shown in FIGS. 2, 4, and 5, the end of the outer cam 26 on the bobbin 5 side extends to the side of the bobbin 5 and has a U-shaped end. Is fixed. The U-shaped portion 31A, which is the lower thread tensioning member of the U-shaped member 31, is composed of two parallel flat plates 31a and 31b which are vertically arranged with respect to the axis of the spline shaft 22.
2 and have a U shape when viewed from above in FIG. The U-shaped portion 31A is provided in the bobbin case 4
2 and 9 are arranged so as to face the opening 4a of the bobbin case 4, and the one flat plate 31a has a thread guide hole as shown in FIG. 31c, a V-shaped notch 31d is formed in the other flat plate 31b as shown in FIGS.

As shown in FIG. 3, a rotating lever 13 serving as an arm member is provided on the side of the set bobbin case 4.
The rotation lever 13 is rotatably supported by a pin 34 fixed to the base 21.
The right part in FIG. 3 of the rotating lever 13 from the pin 34 is curved toward the opening 4a of the set bobbin case 4. The tip 13a of the rotating lever 13 is
As shown in FIG. 2, a key-shaped thread hooking member 40 formed on a bobbin 5 described later is bifurcated so that it can pass between them, and is stretched over a U-shaped portion 31A described later. In order to reliably catch the lower thread, a V-shaped notch as shown in FIG. 3 is formed at each of the forked ends of the end portion 13a. A long groove 13b is provided at the end of the rotating lever 13.
Is formed, and a pin 35 is loosely fitted in the long groove 13b. The pin 35 is fixed to a cylinder head 36a of a cylinder 36, and the cylinder 36 is fixed to the base 21. Therefore, when the cylinder head 36a slides in the up and down direction in FIG. 3, the rotating lever 13 swings around the pin 34 as a fulcrum.
The tip 13a of the rotating lever 13 is configured to rotate to the vicinity of the outer periphery of the bobbin shaft 5a (see FIG. 9). A thread hooking means is inserted through the opening 4a of the bobbin case 4 to the vicinity of the outer periphery of the bobbin shaft 5a by the rotation lever 13, the cylinder 36 and the like .

By the way, in the present embodiment, the bobbin 5 is also minimally changed. That is, as shown in FIGS. 9 to 11, the bobbin shaft 5
An annular V-shaped groove 5b cut out in a V-shape along the circumferential direction is formed on the outer periphery of a, and a key-shaped threading member 40 protruding outward is formed in the V-shaped groove 5b. . here,
At a position rearward of the rotation of the thread hooking member 40 (on the side opposite to the hook), the depth of the groove slope 5c on the yarn end side (left side in FIG. 10) is set to the groove slope on the lower thread supply side (FIG. 10). (Right side in FIG. 5). That is, of the V-groove 5b formed over the entire circumference, the thread hooking member 40
Only the groove depth on the yarn end side at the rear position at the time of rotation is deepened, and the groove depth of this deep groove gradually decreases as the distance from the yarn hooking member 40 increases, and finally, the groove inclination on the lower yarn supply side The structure is such that the step is eliminated in accordance with the depth of the surface 5d. The lower thread automatic supply device 100 is configured as described above.

Next, regarding the transfer mechanism 7,
This will be described with reference to FIG. This transfer mechanism 7
Holds the bobbin case 4 housed in the shuttle 2 and
The bobbin case 4 having the bobbin thread already wound and prepared in the bobbin automatic thread feeding device 100 is gripped and mounted in the shuttle 2 while being pulled out from the inside. That is, in the transfer mechanism 7, a cylindrical bearing 7c is attached to a support body 7b provided above the mounting base 7a so as to project in a substantially horizontal direction.
On the outer peripheral surface side of c, a rotary cylinder 7d having a hollow cylindrical shape and a spline groove 7k formed in the outer peripheral surface along the axial direction is mounted so as to be rotatable and axially movable. A gear 7e having a spline 7m formed on the inner circumference is provided on the base end side (right end side in the figure) of the rotary cylinder 7d, and the gear 7e is provided on the output shaft of the drive motor 7f. The pinion gear 7g is meshed with the pinion gear 7g. The drive motor 7f is fixed to the mount 7a.

On the other hand, an air cylinder 7h is provided inside the bearing 7c so as to extend in the axial direction, and an output shaft 7i of the air cylinder 7h is provided with respect to the bottom of the rotary cylinder 7d. It is axially engaged. In this engagement portion, the output shaft 7i and the rotary cylinder 7d are rotatably engaged.

Further, from the outer peripheral surface side of the rotary cylinder 7d, arms 7j, 7j, 7j spaced apart at 120 ° intervals on the same circumference radially extend toward the opposite side. A bobbin gripping mechanism 8 is provided at the tip of each of the arms 7j, 7j, 7j. These bobbin gripping mechanisms 8 will be described with reference to FIGS. 29 and 30) and FIG. As shown in FIG. 29, FIG. 30, and FIG. 31, a pair of side plates 8a, 8a
Between them, the rotating shaft 8b is rotatably hung,
A lock lever 4e of the bobbin case 4 is attached to the rotation shaft 8b.
Is released from the closed position to open. The rotation shaft 8b is provided on one side plate 8a.
And one end of a drive arm 8d is fixed to an outwardly protruding portion of the rotating shaft 8b.
A cam groove 8e extending in the longitudinal direction of the drive arm 8d is formed in the other end of the drive arm 8d,
A pin 8g of a driving piece 8f is movably fitted in the cam groove 8e. The driving piece 8f is connected to an output shaft (cylinder rod) 8j of an air cylinder 8h fixed to the side plate 8a via an arm 8i. Therefore, the operating force of the air cylinder 8h is equal to the driving piece 8f,
The rotation is transmitted to the lever claw 8c via the pin 8g, the drive arm 8d, and the rotation shaft 8b, whereby the lever claw 8c is rotated.

The lever claw 8c has a distal end curved in an arc shape, and the curved distal end can be inserted into an overlapping portion between the lock lever 4e of the bobbin case 4 and the bobbin locking plate 4b. Are located in The tip of the lever claw 8c rotates according to the locus indicated by the solid line P in FIG.
The rotation of the lock lever 4e causes the lock lever 4e of the bobbin case 4 to rotate.
Are rotated and opened according to the trajectory indicated by the two-dot chain line Q in FIG.

At this time, the both side plates 8a, 8a
Is formed in a substantially rectangular shape on the side surface, and a tip end portion thereof, that is, an edge portion on the left side in the drawing facing the shuttle 2 is formed in a shape along the outer surface shape of the bobbin case 4. The rotation stopper plate 8k provided so as to protrude from the side plate 8a is inserted into the recess 4g on the bobbin case 4 side, whereby the bobbin case 4 and the bobbin gripping mechanism 8 are positioned. Have been.

Further, a base body 8m that receives the opened lock lever 4e at the open position is provided between the both side plates 8a, 8a. The lever receiving surface of the base body 8m is provided with a lock lever 4e (FIG.
1 is formed on an inclined surface along a two-dot chain line), and a rectangular trapezoidal convex portion 8n that enters into the hole 4f of the lock lever 4e is formed at an intermediate portion thereof. In addition, this convex portion 8
An arc-shaped concave portion 8p for receiving the tip portion of the lock lever 4e is formed slightly above the inclined surface of n. The lock lever 4e received by the base body 8m is clamped and fixed in an open state by the pressing force from the lever claw 8c, whereby the entire bobbin case 4 is gripped. I have. The transfer mechanism 7 is configured as described above.

Next, the operation of the automatic lower thread supply device 100 configured as described above and the transfer mechanism 7 to which the automatic lower thread supply device 100 is applied will be described. First, the position of the cam follower pin 29 of the automatic lower thread supply device 100 in the cam groove 33 is set to the initial position shown in FIG. Pull out from the spool 45 serving as a supply means,
The yarn end is passed over a V-shaped notch 31d formed in the other flat plate 31b through the yarn guide hole 31c (FIGS. 4 and 5).
reference).

When the power of the apparatus is turned on, the yarn guide mechanism drive motor MR starts rotating counterclockwise in FIG.
The spline shaft 22 starts rotating clockwise. The cam follower pin 29 connected to the spline nut 24 is restricted by the cam groove 33 and moves from the position shown in FIG. 4 to the position shown in FIG. At this time, the thread end holding plate spring portion 30f of the thread handling plate 30 is, as shown in FIGS.
The U-shaped portion 31A is located at a position facing the other flat plate 31b.
The lower thread 46 is sandwiched between the first thread 1b and the thread end presser leaf spring portion 30f, and the lower thread 46 is stretched between the flat plates 31a and 31b, and is in a standby state.

On the other hand, when the lower thread of the bobbin 5 accommodated in the bobbin case 4 in the shuttle 2 is consumed, the rotary cylinder 7 d is rotated by the operation of the drive motor 7 f from the state of FIG. Stop at the position. Next, the output shaft 7i of the air cylinder 7h of the transfer mechanism 7 is advanced toward the left side in FIG. 1, and the bobbin gripping means 8 approaches the shuttle 2 side. At this time, the lever claw 8c of the bobbin gripping means 8
As shown in FIG. 29, the open state is maintained, and in this state, the front edge of the side plate 8a is pressed against the outer surface of the bobbin case 4.

After the bobbin gripping means 8 is pressed against the bobbin case 4, the lever claw 8 c is turned in the closing direction (the lower side in FIG. 29) by the air cylinder 8 h of the bobbin gripping means 8, whereby the bobbin case 4 is rotated. Lock lever 4e
Is released. That is, the distal end of the lever claw 8c in the open state is connected to the lock lever 4 of the bobbin case 4 in the closed position.
Then, the lock lever 4e is moved inward from the closed position by entering the inside from the front end portion of e and is opened. The released lock lever 4e is received and stopped by the base body 8m of the bobbin gripping means 8 at the open position. In a state where the lock lever 4e is opened, the lock lever 4e is pressed against the base body 8m by the pressing force of the lever claw 8c and is clamped. As a result, the entire bobbin case 4 is gripped by the bobbin gripping means 8. You. Also, by maintaining the lock lever 4e in the open state in this manner, the hook 2
The bobbin case 4 is set in a free state in which the bobbin case 4 can be detached, and the bobbin 5 is held so as not to be detached from the bobbin case 4.

Next, the output shaft 7 i of the air cylinder 7 h of the transfer mechanism 7 is pulled in toward the right side in FIG. 1, whereby the bobbin case 4 is pulled out of the shuttle 2. The rotation cylinder 7 is driven by the operation of the drive motor 7f.
The bobbin case 4 gripped by the gripping means 8 is rotated by the clutch disc 17a of the bobbin thread automatic supply device 100.
Is located to face. And the air cylinder 7
The output shaft 7i of h moves forward toward the left side in FIG. 1, and the held bobbin 5 is pressed against the clutch disc 17a, so that the bobbin 5 and the clutch disc 17a are connected.
At this time, the position of the opening 4a of the bobbin case 4 is a position where the tip 13a can pass when the rotating lever 13 rotates.

In this state, when the cylinder head 36 a of the cylinder 36 is moved upward in FIG. 3, the rotation lever 13 rotates clockwise about the pin 34 as a fulcrum. Then, as shown in FIGS. 8 and 9, the distal end portion 13a catches the lower thread 46 laid between the flat plates 31a and 31b, and the rotating lever 13 further rotates. Then, the leading end 13a that has captured the lower thread passes through the opening 4a of the bobbin case 4, and then reaches the vicinity of the outer periphery of the bobbin shaft 5a and stops. At this time, the rotation of the rotation lever 13 exerts a force to draw the yarn on the yarn end side toward the bobbin shaft 5a, but the yarn on the yarn end side is located between the other flat plate 31b and the yarn end holding plate spring portion 30f. Since the pinching force is greater than the force that pulls the yarn at the yarn end side toward the bobbin shaft 5a, the bobbin thread 46 is pulled from the bobbin 45.

When the rotation lever 13 stops, the winding motor MC starts rotating, and the bobbin 5 connected to the clutch shaft 17 by the clutch board 17a also starts rotating. Then, the key-shaped thread hooking member 40 formed on the bobbin 5 rotates, and the lower thread stretched between the side plates of the tip portion 13a of the rotating lever 13 is captured. The lower thread hooked on the thread hooking member 40 enters the V groove 5b behind the thread hooking member 40 as the bobbin 5 rotates.

Here, as described above, since the V-groove 5b is formed so that the groove depth on the yarn end side is deeper than that on the lower yarn supply side, as shown in FIG. 11, the yarn on the yarn end side Is always lower than the yarn on the supply side and is superposed.The binding force generated by the lower yarn on the supply side exceeds the clamping force on the yarn end side, and the yarn on the yarn end side is placed in the bobbin case. Be drawn in. Thereafter, the bobbin thread drawn into the bobbin case is also held down by the supply-side bobbin with the rotation of the bobbin 5, and the bobbin 46 is wound around the bobbin 5 with the bobbin 5 fixed. To go. When the rotation amount reaches a preset rotation amount, the winding motor MC stops, and the winding of the bobbin thread 46 around the bobbin 5 ends, and the state shown in FIGS.

When the winding of the bobbin 5 is completed as described above, the bobbin case 4 is then started to be threaded. That is, the yarn guide mechanism drive motor MR starts to rotate in a direction opposite to the rotation before the standby, and the cam follower pin 29 is restricted by the cam groove 33 and moves upward from the position shown in FIG. Then, it reaches the lower branch portion of the cam groove 33 in the figure, and its course is regulated by the check guide valve 32A, and further proceeds obliquely upward to the right in the figure. The thread handling plate 30 moves in accordance with the cam follow pin 29, and the lower thread 46 led out from the bobbin 5 is hooked on the inner surface of the other extending portion 30c, as shown in FIGS. , To the right in the figure.

The cam follower pin 29 is restricted by the cam groove 33 from the position shown in FIG. 14, moves this time diagonally to the upper left, and reaches the upper side of the cam groove 33 in the drawing. The thread handling plate 30 moves in accordance with the cam follow pin 29, and the lower thread 46 led out from the bobbin 5 in the right direction as shown in FIG.
, And is further derived obliquely upward to the right, and as shown in FIG. 17, is derived through a gap formed between the bobbin case 4 and the bobbin 5.

The cam follower pin 29 is restricted by the cam groove 33 from the position shown in FIG. 16, passes through the upper branch in the figure, and further moves upward in the figure. The thread handling plate 30 moves in accordance with the cam follow pin 29, and the lower thread 46 led out through a gap formed between the bobbin case 4 and the bobbin 5, as shown in FIG. While moving further upward while being captured by the capturing pool portion 30b, as shown in FIG.
Into the slit groove 4b formed in the groove.

Then, the yarn guide mechanism drive motor MR starts reverse rotation, and the cam follower pin 29 is regulated by the cam groove 33 from the position shown in FIG. 18 and reaches the upper branch portion in FIG. The course is regulated by the guide valve 32B, and the vehicle further proceeds in a diagonally lower left direction in the figure. Thread handling board 3
0 moves according to the cam follow pin 29 and the bobbin 5
Lower thread 46 which is led out through the slit groove 4b
As shown in FIG. 20, the bobbin moves further leftward while being captured by the yarn capturing pool 30b, and reaches the lower thread outlet hole 4c of the bobbin case 4 as shown in FIG. The thread hooking on the case 4 ends.

Thereafter, the cutting process of the lower thread 46 is started, and the cam follower pin 29 is regulated by the cam groove 33 from the position shown in FIG. It takes a course that passes through and goes downward in the figure. The thread handling plate 30 moves in accordance with the cam follow pin 29, and the lower thread 46 led out from the lower thread lead-out hole 4c of the bobbin case 4 is captured by the thread capturing pool portion 30b as shown in FIG. As it moves further downward, it is caught in the yarn guide groove 30d.

Then, the cam follow pin 29 is
The position shown in FIG. 1 is restricted by the cam groove 33, and further proceeds downward in the figure and returns to the standby position shown in FIG.
The thread handling plate 30 moves in accordance with the cam follow pin 29, and the thread end holding plate spring portion 30f of the thread handling plate 30 moves to a position facing the other flat plate 31b of the U-shaped portion 31A and stops. Accordingly, the lower thread 46 led out from the lower thread lead-out hole 4c of the bobbin case 4 moves further downward while being captured by the thread guide groove 30d as shown in FIG. The lower thread 46 is captured by the formed V-shaped notch 31d, and the flat thread 31a, 3
1b (see FIG. 5).

At this time, the lower thread outlet hole 4 of the bobbin case 4
As shown in FIG. 5, the lower thread 46 derived from c passes under the movable blade 30e formed on the inner peripheral side of the thread handling plate 30 in the drawing, and at the crotch portion of the thread guide groove 30d. The movable blade 30e is folded back and is led out to the outer peripheral side of the thread handling plate 30, and the movable blade 30e reaches a position facing the distal end of the fixed blade 37 as shown in FIG. The supply yarn is automatically cut between the tip of the fixed blade 37 and the movable blade 30e.

After the lower thread 46 wound on the bobbin 5 is automatically cut in this way, when the lower thread stored in the bobbin case 4 in the shuttle 2 is consumed,
The bobbin 5 on which the bobbin thread is wound is moved by the transfer mechanism 7 to a position facing the shuttle 2 together with the bobbin case 4, and the bobbin 5 in which the bobbin thread is consumed in the shuttle 2 is moved together with the bobbin case 4. The bobbin 5 around which the bobbin thread has been wound is attached to the shuttle 2 together with the bobbin case 4, and the bobbin 5 where the bobbin thread has been consumed is attached to the bobbin case 4.
Each is attached to the lower thread automatic supply device 100. A series of attachment / detachment operations of the transfer mechanism 7 by the rotation and the forward / backward movement are performed by driving the drive motor 7f and the air cylinder 7h. Hereinafter, by repeating the same operation, the winding of the bobbin 5, the hooking of the bobbin case 4, and the replacement of the bobbin 5 are automatically performed as appropriate.

In the lower bobbin automatic supply device 100, during the driving of the yarn guide mechanism driving motor MR, that is, during the yarn hooking operation of the bobbin case 4, the winding motor MC supplies a lower electric power than when the bobbin 5 is wound. Is supplied, an attempt is made to rotate at a low speed, and a force for winding the yarn is generated. Therefore, the tension of the lower thread 46 is kept constant.

As described above, in the present embodiment, the bobbin thread 46 supplied from the bobbin 45 is placed outside the opening 4a of the bobbin case 4 in which the bobbin 5 is built, and in the axial direction of the bobbin shaft 5a. A U-shaped part 31A that can be stretched and held along the lower thread 46 and the lower thread 46 stretched by the U-shaped part 31A are inserted through the opening 4a of the bobbin case 4 near the outer periphery of the bobbin shaft 5a. Rotating lever 13 to be inserted up to
A V-shaped groove 5b and a key-shaped thread hooking member 40 protruding outward are formed on the outer periphery of the bobbin shaft 5a, respectively, and the groove depth on the thread end side behind the thread hooking member 40 is smaller than that on the lower thread supply side. A bobbin 5 that is formed deeper, a winding motor MC that imparts rotation to the bobbin 5, and a bobbin thread that is rotatable along the outer periphery of the bobbin case 4 and the axial direction of the bobbin shaft 5a. A yarn guide mechanism 30 (22, 24, 26, 27, 29, 33) movable in accordance with the mounting path, and a reversible rotatable yarn guide mechanism drive motor MR for imparting rotation to the yarn guide mechanism 30 are provided. With this configuration, it is possible to automatically wind the bobbin 5 on the bobbin 5 and hook the bobbin case 4 with a slight change to the conventional bobbin 5. In addition, it is possible to maintain good sewing quality as before.

As described above, the bobbin 5 is only slightly changed, and the bobbin automatic supply device 100
Has a simple configuration, so that cost reduction can be achieved.

During the threading operation of the bobbin case 4,
Since a lower power is supplied to the winding motor MC than when the bobbin 5 is wound, the tension of the lower thread 46 is kept constant.
Can be carried out extremely well.

Further, at the time when the yarn hooking on the bobbin case 4 is completed, the supply yarn is separated between the moving movable blade 30 e and the opposing fixed blade 37, so that the configuration is simple. It is also possible to automatically cut the lower thread.

FIG. 25 is a front view of a bobbin 15 used in a lower thread automatic supply device 100 according to another embodiment of the present invention.
FIG. 26 is a diagram showing an arrow AA in FIG. 25, and FIG.
FIG. 28 is a diagram shown by an arrow B in FIG. 26, and FIG. In the bobbin 15 of this embodiment, a V-shaped annular V-shaped groove 15b along the circumferential direction is cut out on the outer periphery of the bobbin shaft 15a, and a key protruding outward into the V-shaped groove 15b. The point that a thread-shaped threading member 40 is formed is the same as in the previous embodiment, but a recess is formed in a V-groove 15b that is rearward when the threading member 40 rotates, and the recess is formed in this recess. The point that the small pin 15e is fitted and fixed is different from the previous embodiment.

Here, a groove having a step is formed on the upper surface of the small pin 15 e, and the step has a groove depth on the yarn end side (left side in FIG. 28) similar to the previous embodiment. It is formed to be deeper than that on the lower thread supply side (the right side in FIG. 28). Even with such a configuration, the lower thread hooked on the thread hooking member 40 enters the stepped groove of the small pin 15e behind the thread hooking member 40 as the bobbin 15 rotates, and the yarn on the yarn end side. Are always lower than the yarn on the supply side and are superposed, so that the operation is the same as that of the previous embodiment, and it is needless to say that the same effect as that of the previous embodiment can be obtained. As in the previous example,
Since the step groove is not formed directly on the bobbin shaft,
There is the further advantage that processing is easy.

Although the invention made by the inventor has been specifically described based on each embodiment, the present invention is not limited to the above embodiments, and can be variously modified without departing from the gist thereof. Needless to say, there is.

[0063]

As described above, the sewing machine according to the first aspect of the present invention
According to the bobbin, the bobbin thread to be wound
As the bobbin rotates for winding the bobbin, the bobbin
A thread hook that protrudes radially from the shaft and has a key at the tip
Captured by the member and wound around the bobbin shaft.
Therefore, a small change to the conventional bobbin
Can be automatically wound. In addition, its of
As a result, the meeting quality must be maintained as good as before.
Becomes possible.

Further , according to the bobbin of the sewing machine of the second invention,
Preferably, in addition to the first aspect, a radial extension of the thread hooking member is provided.
Formed on the bobbin shaft along the radial direction, located close to the top
To the V-shaped groove
The end of the thread is wound around, so it can be
Automatically winds the bobbin with only minor changes
become able to. Also, as a result, the sewing quality is
It is possible to maintain good without changing.

Further , according to the automatic lower thread supply device of the third invention,
If this is the case, the yarn hooking means is formed so as to protrude from the bobbin shaft.
When the material is located at the opposing position on its movement path
In addition, by rotating the bobbin by the thread winding means,
The yarn held by the forked portion of the yarn hooking means is captured by the yarn hooking member.
Since it is wrapped around the bobbin shaft after capturing,
With a slight change to the bobbin
Automatically. Also, as a result, sewing products
It is possible to maintain good quality as before
You. In addition, since the above device configuration is simple, the device
Cost can be reduced.

In the fourth and fifth inventions, an automatic lower thread supply device is provided.
According to the position, the bobbin thread is wound around the bobbin in the bobbin case.
The yarn connected to the feeding means is fed to the bobbin case by the yarn guiding means.
Engaged outside and engaged by this thread guiding means
Insert the thread from the open end of the slit groove
Between the plate spring and the leaf spring
As described above, depending on the moving means, the circumferential direction of the bobbin case or
The bobbin case and the thread guide
The relative movement of the step and the conventional bobbin
Thread the bobbin case without changing the case
You can do it automatically. Also, as a result, the sewing quality
Can be satisfactorily maintained without changing from the prior art.
In addition, since the above device configuration is simple, the device
Costs can be reduced.

Also, according to the automatic lower thread supply device of the sixth invention,
In this case, in addition to the above-described fourth aspect, the yarn guide means can be moved within a movable range.
Relative to the bobbin case
Yarn between the lower thread supply means and the bobbin
Are fixedly arranged on the movable blade formed on the yarn guiding means and the machine frame.
Since the cutting is performed between the fixed blade and the fixed blade, the effect of the fourth invention is obtained.
In addition to the fruit, the bobbin case can be threaded with a simple device configuration.
It is possible to automatically cut the lower thread made.

Further , according to the seventh embodiment of the automatic lower thread supply device,
Then, in addition to the above-described fourth aspect, tension is applied during the relative movement.
Means to apply a predetermined tension to the yarn.
As a result, the lower thread tension can be maintained at a constant
Threading of the case is performed better than the fourth invention.
Becomes possible.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an automatic lower thread supply device and a bobbin changing device to which the automatic lower thread supply device according to an embodiment of the present invention is applied.

FIG. 2 is an enlarged cross-sectional view of the lower thread automatic supply device in FIG.

FIG. 3 is a view taken along the line XX of FIG. 2;

FIG. 4 is a diagram showing the cylindrical grooved cam, bobbin case, and thread handling plate of FIG. 2 developed in a plane.

FIG. 5 is an enlarged perspective view of a U-shaped member and a thread end pressing leaf spring portion showing a state in which a yarn end of a supply yarn is clamped.

FIG. 6 is a plan development view of a cylindrical grooved cam, a bobbin case, and a yarn handling plate showing a state in which a yarn end of a supply yarn is held.

FIG. 7 is an essential part extraction diagram of FIG. 3 showing a cutting mechanism for separating the yarn on the supply side and the yarn wound on the bobbin.

FIG. 8 is a schematic view of FIG. 3 showing an operation of an arm member for inserting the lower thread stretched by the lower thread stretching member to a position near the outer periphery of the bobbin shaft.

FIG. 9 is a cross-sectional view of FIG.

FIG. 10 is an enlarged view of a main part of the bobbin showing an annular groove and a thread hooking member of the bobbin.

FIG. 11 is a side view of FIG. 10 showing a state in which a supply yarn is hooked on a yarn hooking member.

FIG. 12 is a developed plan view of the cylindrical groove cam, the bobbin case, and the thread handling plate at the time when the thread winding on the bobbin is completed.

13 is a perspective view of the bobbin case showing a relationship between the wound lower thread and the bobbin case in the state of FIG. 12;

FIG. 14 is a developed plan view of the cylindrical grooved cam, the bobbin case, and the thread handling plate in a state where the thread handling plate of FIG. 12 is moved.

15 is a perspective view of the bobbin case showing a relationship between the wound bobbin thread and the bobbin case in the state shown in FIG. 14;

FIG. 16 is a plan development view of the cylindrical groove cam, the bobbin case, and the thread handling plate in a state where the thread handling plate of FIG. 14 is further moved.

17 is a perspective view of the bobbin case showing a relationship between the wound lower thread and the bobbin case in the state of FIG. 16;

FIG. 18 is a plan development view of the cylindrical groove cam, the bobbin case, and the thread handling plate, showing a state where the thread handling plate of FIG. 16 is further moved.

FIG. 19 is a perspective view of the bobbin case showing a relationship between the wound bobbin thread and the bobbin case in the state of FIG. 18;

20 is a developed plan view of the cylindrical groove cam, the bobbin case, and the thread handling plate in a state where the thread handling plate of FIG. 18 is further moved.

FIG. 21 is a developed plan view of the cylindrical groove cam, the bobbin case, and the thread handling plate in a state where the thread handling plate of FIG. 20 is further moved.

FIG. 22 is a perspective view of the bobbin case showing a relationship between the wound bobbin thread and the bobbin case in the state of FIGS. 20 and 21.

FIG. 23 is a plan development view of the cylindrical grooved cam, the bobbin case, and the thread handling plate showing the thread cutting operation at the time when the thread handling plate of FIG. 21 is further moved.

24 is a perspective view of the bobbin case showing a relationship between the wound bobbin thread and the bobbin case in the state of FIG. 23.

FIG. 25 is a front view of a bobbin used in an automatic lower thread supplying device according to another embodiment of the present invention.

FIG. 26 is a diagram showing an AA arrow in FIG. 25;

FIG. 27 is a view as indicated by arrows BB in FIG. 26;

FIG. 28 is a diagram showing a line CC in FIG. 26;

FIG. 29 is a partially enlarged side view showing a configuration of a bobbin gripping means used in the bobbin exchanging device in FIG.

FIG. 30 is a partially enlarged rear view showing the configuration of the bobbin gripping means shown in FIG. 29.

31 is a partially enlarged longitudinal sectional view taken along the line ZZ in FIG. 30, showing the operation of the bobbin gripping means shown in FIG. 29.

[Explanation of symbols]

Reference Signs List 4 bobbin case 4a bobbin case opening 4b slit groove 5, 15 bobbin 5a, 15a bobbin shaft 5b, 15b V-shaped groove 5c thread end side groove 5d lower thread supply side groove 13 , 36 thread hooking means 13a Parts 17, 17a, MC thread winding means (tension applying means) 9 , 21, 22, 22a, 23 to 29, 33, MR transfer
Moving means 30 Guide means 30e Movable blade 31A Lower thread passing member 37 Fixed blade 40 Threading member 45 Lower thread supply means 46 Lower thread 100 Lower thread automatic feeder

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Masayuki Ito 8-2, Kokuryo-cho, Chofu-shi, Tokyo Juki Corporation (56) References JP-A-4-73094 (JP, A) Shokai Sho60 164 378 (JP, U) JP 61-61835 (JP, B2) JP 4-40039 (JP, B2) JP 4-40040 (JP, B2) (58) Fields surveyed (Int. Cl) . ⁶ , DB name) D05B 59/00 D05B 57/28 D05B 59/04

Claims (7)

(57) [Claims] (1) The bobbin thread rotates on the shaft when the bobbin is wound.
Wound and stored in bobbin case during seam formation
Bobbin of the sewing machine from which the bobbin thread wound out is fed out
In the yarn, a key portion is formed at a tip protruding radially from the shaft portion.
A hooking member is provided to wind the bobbin at the start of bobbin winding as the bobbin rotates.
The end of the lower thread to be tightened is caught by the thread hooking member and wound.
A bobbin of a sewing machine characterized by being sewn. 2. The bobbin of the sewing machine according to claim 1.
And located close to the shaft on the radial extension of the thread hooking member.
V-shaped grooves are formed along the radial direction.
Bobbin of sewing machine. 3. A bobbin case having an opening at a peripheral edge.
And a shaft that can be housed in this bobbin case and winds the yarn
A bobbin formed with a threading member projecting more radially, and a bobbin connected to the bobbin housed in the bobbin case.
First , a thread winding means that can rotate around the same axis, and a bifurcated portion that can hold the thread to be wound crosswise.
Formed at the end and separating the forked part from the bobbin case
Position and into the opening of the bobbin case and
To the operating position where it can be opposed to the moving path of the mounting member
The thread winding means, when the thread hanging means is located at the operating position,
By rotating the bobbin by means,
Is wound after the thread holding member captures the thread held by
An automatic lower thread feeding device, characterized in that: 4. A frame and an open front in one axial direction.
The frame is opened at one side in the axial direction and bent in a substantially L-shape to form the frame.
Slit formed on the peripheral edge of the system and the slit groove
Fixed to the outer peripheral edge of the frame so as to cover the middle part of
A bobbin case having a thread tension leaf spring;
With a shaft that can be accommodated in
A bin and the bobbin case are held and held in the bobbin case.
Connected to the stored bobbin and rotate about the same axis as the bobbin
And the bobbin in the bobbin case is rotated by the bobbin winding means.
By this, the lower thread supply means supplies the shaft portion of the bobbin to the shaft portion.
In a lower thread automatic supply device for winding a supplied thread, the lower thread supply device is wound around a bobbin in the bobbin case.
Can be engaged with the thread connected to the step outside the bobbin case
The yarn guide means disposed close to the outer periphery of the bobbin case, and the yarn engaged by the yarn guide means is opened to open the slit groove.
After passing through the release end, the slit groove and the leaf spring
Bobbin so that it fits between
Forward in the circumferential or axial direction of the case or in its combined direction
The bobbin case and the yarn guiding means are relatively moved.
A lower thread automatic supply device comprising: a moving unit. 5. An apparatus for automatically supplying a lower thread according to claim 4.
The thread guide means is wound around the bobbin in the bobbin case and
The yarn connected to the supply means is engaged outside the bobbin case.
The guide body which is arranged in the vicinity of the bobbin case
In the circumferential and axial directions of the bobbin case, and
The moving means moves the yarn engaged by the guide body into a slit groove.
Between the slit groove and the leaf spring
The thread is inserted into the gap and guided to the tip of the slit groove.
Guide means in the circumferential or axial direction of the bobbin case or
Automatic lower thread feeding characterized by moving in the synthesis direction
apparatus. 6. A lower thread automatic feeding device according to claim 4.
The thread guide means is provided with a movable blade constituting the thread cutting means.
The fixed blade constituting the thread cutting means is held by the thread winding means.
Fixed to the machine frame close to the bobbin case, and the means moves relative to each other beyond the range of movement.
Cutting the thread between the lower thread supply means and the bobbin.
Automatic bobbin thread feeding device. 7. The lower thread automatic feeding device according to claim 4, wherein
Tension during the relative movement to apply a predetermined tension to the yarn.
An automatic lower thread feeding device characterized by providing a feeding means.