JPS5949829B2 - Automatic exchange device for bobbin thread bobbin in sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic exchange device for a bobbin thread bobbin in a sewing machine.

Conventionally, this type of automatic exchange device did not exist, and when a bobbin thread came to be replaced due to discharge of the bobbin thread, it was replaced with a new one by five people.

Such manual replacement work is extremely tedious and troublesome, and has problems such as low work efficiency, which causes a decrease in the operating rate of the sewing machine.

θ This invention was made in view of the above circumstances, and aims to automate the work of replacing the bobbin thread bobbin, thereby eliminating the troublesome work of replacing the bobbin, and improving the operating efficiency of the sewing machine by improving the efficiency of the replacement work. It is an object of the present invention to provide a new automatic lower thread bobbin exchange device that can increase the retention of the bobbin thread and has a simple structure by using a magnetic attraction mechanism.

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

First, is it a sewing machine that incorporates a bobbin thread bobbin? An example of a rotary hook mechanism will be briefly explained.

That is, the hook mechanism of the sewing machine includes an inner hook 3 that is relatively rotatably assembled inside an outer hook 2 that is rotationally driven by a shaft 1, and a bobbin thread bobbin (hereinafter referred to simply as It consists of a bobbin (referred to as a "bobbin") 4 and a bobbin case 5 that are detachably assembled.

This bobbin 4 is temporarily held in a bobbin case 5 with the bobbin thread 6 of the sewing machine wound in multiple threads, and is then simultaneously assembled inside the inner hook 3 together with the bobbin case 5. There is.

And, these assemblies are in condition, bobbin case 5
is prevented from rotating relative to the inner pot 3 by matching with the inner periphery of the inner pot 3, and is also held at the tip of the central pin 8 of the inner pot 3 to prevent it from being removed. It has become so.

The hook mechanism configured as described above is installed near the bottom of the upper plate 9 of the sewing machine, and guides the bobbin thread 6 wound around the bobbin 4 through the circumference of the bobbin case 5 and then into the inner hook 3. At the same time, the upper thread of the sewing machine (not shown) is pulled downward from the sewing machine needle by the cooperation of the outer hook 2 and the inner hook 3, and the lower thread 6 and upper thread are used to stitch a predetermined stitch. It is designed to perform its function by forming a

The locking mechanism 7 is attached between the upper and lower guide portions 10, 10 on the front surface of the bobbin case 5 so as to be movable in the left-right direction in FIG. 4, and is always urged rightward in the figure by a spring (not shown). The lock plate 11 is made up of a lock plate 11, and an operating piece 12 is connected to one 411a side of the lock plate 11 so as to be able to be operated in an upright manner.

Normally, the lock plate 11 is in the left position as shown in FIG. 4, and the left side of the lock hole 13 fits into the constricted end portion 8a of the central pin 8 of the inner pot 3. The bobbin case 5 itself is held and prevented from being removed.

Then, by placing your finger on the tip 12a of the operation piece 12 and lifting it up to the front side of the paper in FIG. (not shown) and the corresponding contact surface part (not shown) on the bobbin case 5 side work together to move the lock plate 11 to the left in FIG. 4 against the force of the spring, and this This releases the lock on the bobbin case 5 itself.

In addition, the lock mechanism 7 is in its unlocked state.
The lock plate 11 matches a part of the bobbin 4 to prevent the bobbin 4 from being removed from the bobbin case 5.

Further, the other end 11b of the lock plate 11 projects slightly outward from the bobbin case 5.

The configuration of such a hook mechanism and its locking mechanism 7 is as follows:
It is the same as the conventional one.

The device according to the present invention automatically replaces the bobbin 4 in the hook mechanism as described above, and its configuration will be described below.

Reference numeral 14 in the figure is an L-shaped board provided on the sewing machine main body side, and the bobbin case 5 in the hook mechanism of the sewing machine.
It is located opposite to the front side of.

A guide body 15 is provided on the substrate 14, and a rod 16 is guided and attached to the guide body 15 so as to be movable in the directions of arrows A and B toward and away from the bobbin case 5.

A moving body 17 is attached to the tip of the rod 16.

A piston rod of an electric cylinder (moving means) 8 provided on the side of the base plate 14 is connected to the movable body 17, and when the cylinder 18 expands and contracts, the movable body 17
is moved in the directions of arrows A and B.

The movable body 17 is equipped with an attraction mechanism 19 that can magnetically attract the bobbin case 5 and an unlocking mechanism 20 that can operate to unlock the locking mechanism 7 of the bobbin case 5.

Therefore, first, the former suction mechanism 19 will be explained.

That is, as shown in FIG. 1, each of the upper and lower pair of opposing arm portions 17a and 17H in the substantially U-shaped portion of the movable body 17 is provided with a pair of flat plate-shaped upper and lower supports extending in the left-right direction in the figure. The left end of piece 21.21 is attached.

At the tip of each support piece 21, 21, there are electromagnets 22, 2, respectively.
2 is attached with its electromagnetic adsorption action section facing right.

These electromagnets 22,22 are connected to an external current-carrying circuit (not shown) via cords 23.23.

Next, the lock release mechanism denoted by the reference numeral 20 in the above description will be explained.

That is, an operating piece 25 is provided on the distal end side of the movable body 17 with an L-shaped support plate 24 interposed therebetween toward the right in FIG.

This operating piece 25 is connected to the locking mechanism 7 of the bobbin case 5.
The upper side surface in FIG. 2 is an inclined surface 25a so as to face the other end 11b of the lock plate 11, and has a tapered shape.

When the movable body 17 is moved in the direction of arrow A, the inclined surface 25a is aligned with the other end 1 of the lock plate 11 as shown in FIG.
1b is pressed to move this lock plate 11 to the left in FIG. Then, the lock plate 11 is moved to the right in FIG. 4 and returned.

By the way, the main body side of the sewing machine is equipped with a bobbin storage mechanism 26 capable of storing a plurality of the bobbin cases 5, and the structure thereof will be explained next.

That is, a shaft 29 is supported on the main body side of the sewing machine via a support plate 27 and a bearing 28 so as to be rotatable about an axis in the right direction in FIG. 30 is attached, and a spacer 3 is attached to the other end of the shaft 29.
A disk-shaped storage chamber structure 32 is attached via 1.

The sprocket 30 is meshed with a drive-side sprocket 34 of a motor 33 provided on the main body side of the sewing machine.

In addition, in each of the six positions of the storage chamber structure 32, which are equally spaced along the circumferential direction by a center angle of 60°, there are a total of six bobbins that pass through the middle cloth in the right direction in FIG. A storage room (hereinafter simply referred to as "storage room") E is formed.

When the storage chamber structure 32 is rotated by 60 degrees, one bobbin storage chamber E located above is sequentially connected to the front side of the bobbin case 5 in the hook mechanism and the suction mechanism. 19.

The storage chamber E located sequentially on the front side of the bobbin case 5 includes a support piece 21, 21 on the movable body 17 side and an operation piece 2.
5 can be inserted in the directions of arrows A and B.

Further, one end of a locking plate 35 is attached to each opening edge on the left side in FIG. 1 of each storage chamber E.

At the other end of each locking plate 35, a positioning pin 36 of the same size as the central pin 8 of the inner pot 3 is provided in the corresponding storage chamber E.
It is planted toward the right in FIG. 1 along its center line.

Replacement bobbin cases (not shown) containing bobbins fully wound with bobbin thread are stored and held in five of the total six storage chambers E from the right side in FIG. 1, respectively.

Each storage chamber E has a corresponding shape as shown in FIG. 6, and when located in front of the hook mechanism, the replacement bobbin case can be positioned in the same manner as the bobbin case 5 in the hook mechanism. It is meant to be stored and kept.

Further, in the stored state of such replacement bobbin cases, the central through hole of each bobbin case is fitted with the corresponding positioning pin 36.

Next, the operation of the automatic exchange device configured as described above will be explained.

Normally, the piston rod of cylinder 18 is retracted.

Therefore, at this time, the movable body 17 is at the movement limit position in the direction of arrow B, and the support pieces 21, 21 and the operation piece 25 are located on the left side of the storage chamber structure 32 in FIG. , each electromagnet 22.22 is de-energized.

Therefore, in such normal times, the rotary hook mechanism itself is
When the outer hook 2 is rotationally driven via the shaft 1, it performs a predetermined function below the upper plate 9.

When the remaining amount of bobbin thread 6 on the bobbin 4 in the hook mechanism becomes low, that is, when it is time to replace the bobbin 4 in the evening, automatic control or Under manual control, the automatic exchange device operates sequentially as follows.

That is, first, the cylinder 18 is operated and its cup piston rod is extended.

At this time, the rotary hook mechanism has already been stopped, and the storage chamber structure 32 positions one empty storage chamber E, in which no replacement bobbin case is stored, among the six storage chambers E, above it. It is stopped at a one-turn position facing the front of the hook mechanism.

Therefore, the support piece 21.21 penetrates into this storage chamber E from above and below the locking plate 35 in the one empty storage chamber E, and the operation piece 25 penetrates into this storage chamber E. Penetrate the storage chamber E from the rightward position in FIG. 1 of the locking plate 35 in FIG.
The other end 11b of the lock plate 11 in the bobbin case 5 is brought into contact.

Therefore, this lock plate 11 is gradually moved to the left in FIG. 4, and when the movable body 17 reaches the movement limit position 1 in the direction of arrow A, the lock mechanism 7 of the bobbin case 5 is completely unlocked. Ru.

At this time, each electromagnet 22, 22 has moved to a position where it contacts or faces the front surface of the bobbin case 5 with a slight interval.

Thereafter, each electromagnet 22, 22 is energized.

Therefore, each electromagnet 22, 22 attracts and holds the front surface of the bobbin case 5 by its electromagnetic force.

Thereafter, the cylinder 18 operates and its piston rod gradually retracts and returns.

Therefore, the support pieces 21.21 take out the bobbin case 5 with the bobbin 4 still housed therein in the direction of the arrow B and move it into the empty storage chamber E at the upper position.

Then, when the bobbin case 5 comes into contact with the opposing locking plate 35, the operation of the cylinder 18 is temporarily stopped.

In addition, the operation stop position of the cylinder 18 at this time is
Hereinafter, □ will simply be referred to as "predetermined intermediate position."

Thereafter, each electromagnet 22.22 is de-energized.

Therefore, the suction of the bobbin case 5 is released.

Thereafter, the screw rod of the cylinder 18 retracts to the leftmost position, and the support pieces 21, 21 and the operating piece 25 return to the left position of the storage chamber structure 32 in FIG.

Thereafter, the storage chamber structure 32 is rotated by 60 degrees in one direction by the motor 33, and the storage chamber E containing the replacement bobbin case is located in front of the hook mechanism.

Thereafter, the cylinder 18 is operated to extend its piston rod to the predetermined halfway position, and then each electromagnet 2
2.22 is energized.

Therefore, the replacement bobbin case in the storage chamber structure 32 is attracted to the electromagnet 22, 22 with its lock plate 11 moved to the left in FIG.

Thereafter, the piston rod of the cylinder 18 is moved to the right quadrant position, and each electromagnet 22.22 is then de-energized.

Therefore, the replacement bobbin case is transferred to the inner hook 3 of the hook mechanism while still containing the bobbin 4 fully wound with bobbin thread.

Thereafter, the piston rod of the cylinder 18 retracts to the leftmost position, and the support piece 21.21 and the operating piece 25 return to the left position of the storage chamber structure 32 in FIG.

As the operating piece 25 separates from the other end 11b of the lock plate 11 as the cylinder 18 retracts, the lock plate 11 returns to the right position in FIG.

As a result, the replacement bobbin case is set in the inner pot 3.

In this way, the bobbin 4 in the inner pot 3 is automatically replaced together with the bobbin case 5.

The above series of operations is performed by the bobbin 4 in the hook mechanism.
is automatically repeated each time it is time to replace it.

Therefore, a total of five replacement bobbin cases in the storage chamber structure 32 are replaced with those in the inner pot 3 in order from those along the rotational direction of the storage chamber structure 32.

When all of these five replacement bobbin cases have been replaced with those in the inner pot 3, the bobbin cases in the storage chamber E are lowered with the storage chamber structure 32 removed or attached. Replace the bobbin with a new one containing the fully wound bobbin 4.

In the above embodiment, the electric cylinder 18 is used as a driving means for reciprocating the suction mechanism 19 in the right direction in FIG. 1, but the configuration of this driving means can be changed in design as appropriate. be.

Also, on the main body side of the sewing machine, it covers the right openings of the other five storage chambers E located on the right side of the storage chamber structure 32 in the figure and excluding the one storage chamber E on the upper side in FIG. 1. If a baffle plate (not shown) is provided, it is possible to prevent the bobbin case from falling out of each storage chamber E, and a central A constriction similar to the constriction 8a of the pin 8 is provided, and the locking mechanism 7 locks the bobbin case there. But that's fine.

Further, in the above embodiment, the plurality of storage chambers E are formed as a so-called revolver set so as to sequentially rotate and move in front of the hook mechanism, but the invention is not limited to this in any way; for example, the plurality of storage chambers E can be It is optional, such as configuring it so that it moves linearly in front of one hook mechanism, and it is also possible to replace the replacement bobbin case and the replaced bobbin case at once in a so-called magazine type. Moreover, the number of storage chambers E formed is arbitrary.

□ As described in detail above, according to the automatic bobbin thread bobbin changing device according to the present invention, the bobbin thread bobbin is automatically replaced, thereby eliminating the troublesome task of replacing the bobbin, and The operation rate of the sewing machine can be increased by improving the efficiency of replacement work, and the structure uses a magnetic attraction mechanism to allow the electromagnet to pass linearly through the storage chamber provided in the storage chamber structure. , the structure is simple, there is no malfunction, and the implementation is easy.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a longitudinal sectional view of the main part thereof, Fig. 2 is a view taken in the direction of arrow II in Fig. 1, and Fig. 3 is a suction mechanism showing a state in which a bobbin case is suctioned. 4 is a cross-sectional view taken along line IV-IV in FIG. 3, FIG. 5 is a side view of the storage chamber structure seen from the left in FIG. 1, and FIG. It is an explanatory view of the storage room shape in a room structure. 3...Inner pot, 4...Bobbin, 5...
...Bobbin case, 7...Lock mechanism, 1
8...Cylinder, 19...Adsorption mechanism,
20...Lock release mechanism, 22...Electromagnet, 26...Bobbin storage mechanism.

Claims (1)

[Claims] 1. A bobbin case 5 containing a bobbin thread bobbin 4 is attached to a locking plate 3.
A bobbin case 5 having a built-in bobbin thread bobbin 4 is replaceably installed by engaging a locking plate 11 with a constricted portion 8a of a central pin 8. ,
A storage chamber structure 32 that is movably provided so that the storage chambers E can be individually positioned in front of the inner pot 3 of the hook mechanism.
and an electromagnet 22 that electrically attracts the bobbin case 5.
a support piece 21 having a support piece 21; a moving means 18 for moving the support piece 21 to move the electromagnet 22 through the storage chamber E of the storage chamber structure 32 to the inner pot 3; The present invention is characterized by comprising an operation piece 12 that presses the lock plate 11 to release the engagement of the lock plate 11 with the central pin 8 when the bobbin case 5 installed in the bobbin case 3 is attracted by the electromagnet 22. Automatic replacement of bobbin thread bobbin in sewing machine. Replacement type.