JPS6020371Y2 - Lockstitch and lockstitch sewing machine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sewing machine that can perform both lockstitch and lockstitch at the same time.

Conventionally, this type of sewing machine was first published in 1986-309.
Although the sewing machine described in Publication No. 1 can be seen, such a sewing machine has an overlock mechanism, a lock stitch mechanism, and a cloth feeding mechanism, and the overseam mechanism moves up and down to form an overseam stitch. The lockstitch mechanism is composed of a looper that cooperates with the darning needle to form an overlock stitch, and a needle plate provided with a thread guide piece that maintains a predetermined shape of the combination of loops immediately before being formed. A lockstitch needle that moves up and down to form a lockstitch stitch, a throat plate that is substantially the same as the throat plate that forms the overlocking mechanism, through which several needles pass, and Regarding a sewing machine consisting of several sewing needles and a reciprocating rotary pot that rotates reciprocatingly in synchronization, a darning needle that moves up and down in conjunction with the lockstitch needle is integrated so that it moves up and down in the vertical direction parallel to the lockstitch needle. Because they are arranged side by side, they have the following drawbacks.

That is, as is well known, in order to form a lock stitch, the lock stitch needle and the looper that cooperate with it must be set so that their operating planes intersect at a predetermined angle of inclination. However, in the conventional type, a darning needle that moves up and down in conjunction with the lockstitch needle is arranged side by side integrally so that it moves up and down in the vertical direction parallel to the lockstitch needle.
The looper disposed inside the bed must be disposed in an inclined manner so that the darning needle operates vertically on a predetermined inclined plane, and on the other hand, a cloth feeding mechanism, a rotary hook, etc. must be disposed. There is limited space inside the head due to the complicated mechanisms associated with these devices, and therefore it is unreasonable in terms of space to set the operating trajectory of the looper in an inclined manner due to interference with the internal mechanisms. However, since the piercing points of the lockstitch needle and the darning needle are very close to each other, the lockstitch mechanism and the darning mechanism interfere with each other.As a result, a reciprocating rotary hook that rotates back and forth in synchronization with the lockstitch needle is used. It is necessary to change the arrangement to the front direction, etc., and in order to drive the rotary hook, a rotational direction changing mechanism such as a bevel gear is required between the lower shaft and the rotary hook, and as a result, the bed This has the drawbacks that the internal space becomes narrower, the mechanism becomes more complicated, and the cost increases.

In view of these drawbacks, the present invention has developed a lockstitch needle that is driven vertically up and down, a hook that cooperates with a counter to form lockstitch stitches, and a needle that is driven vertically up and down, and a hook that forms a lockstitch stitch along a trajectory having a predetermined inclination angle. In a sewing machine equipped with a lock sewing needle that is driven forward and backward, and a looper mechanism that cooperates with the lock sewing needle to form lock sewing stitches, the lock sewing needle is inserted through the needle bar. Supported so as to be slidable up and down on a track having a predetermined inclination angle,
The lower end of the needle bar on which the lockstitch needle is attached and the lower end of the lockstitch needle bar are opposed to each other in the direction of inclination of the lockstitch needle by a connecting member that has a horizontally protruding guide pin inserted through the needle bar. An embodiment of the present invention will be described below with reference to the drawings. 1 shows a bed 2 and an arm. 3, the head 4 of the arm 3 is equipped with a needle bar 5 that moves up and down in the vertical direction, similar to a C-main ordinary lockstitch sewing machine, and a mounting member 6 is attached to the lower end of the needle bar 5. A lockstitch needle mechanism 8 is constructed by fixing the lockstitch needle 7 with the needle 7 through a predetermined mechanism by the rotation of the main shaft 10 which is rotated by the drive of the pulley 9.
It seems to control the vertical drive.

Reference numeral 11 denotes a lock sewing needle mechanism arranged on the right side of the lock stitch needle mechanism 8. A guide hole 12 inclined in the cloth feeding direction is formed in the head 4 of the arm 3, and the needle is inserted into the guide hole 12. stick 1
3 is inserted into the lower end of the needle bar 13 so as to be slidable up and down at a predetermined inclination angle.

A lock sewing needle 15 is fixed via a mounting member 14.

Reference numeral 16 denotes a connecting member, one end of which is attached to the attachment member 6 at the lower end of the needle bar 5 for lock stitching with a screw 17, and the other end has a guide pin 18 protruding in the horizontal direction, and a connecting member for lock stitching. Hole 1 corresponding to the guide pin 18 at the lower end of the needle bar 13
9 is inserted through the hole 19, and a guide pin 18 is inserted and connected to the hole 19 from a direction opposite to the direction of inclination of the needle 15 for lock stitching. The needle bar 13 for lock stitching is forced to synchronize and interlock up and down in an inclined manner.

The guide hole 12 is set so that the piercing point A of the lock stitching needle 15 into the fabric W is located in front of the piercing point B of the lock stitching needle 7.
The motion trajectory of the needle 15 is set by

Further, the sewing section 20 on the bed 2 has a presser foot 21, a throat plate 22, and a feed dog 2 that protrudes from and retracts from the throat plate 22, as in a normal sewing machine.
3, and forces the fabric W to be transferred backward sequentially,
Further, a cutting device 24 for trimming the edges of the cloth is provided on the front right side of the sewing section 20.

FIG. 3 shows the internal mechanism of the bed 2, in which a lower shaft 25 is provided in the longitudinal direction of the center and is driven to rotate in the opposite direction in relation to the rotation of the main shaft 10. A hook 26 is attached which cooperates with the needle 7 to perform lock stitching.

Reference numeral 27 denotes a looper mechanism unit that performs lock sewing in cooperation with the lock sewing needle 15, and is comprised of an inverted dog-shaped over looper 28 and a < character shaped under looper 29. It is attached to the upper end of a swinging rod 32 which is pivotally connected via a pin 31 to a wall portion 30 which is protruded from the wall 30, and one end of a slide rod 33 is slidably inserted into the lower end of the swinging rod 32. At the same time, the other end of the slide rod 33 is pivotally connected to one end of the connecting rod 34,
The other end of the connecting rod 34 is inserted into an operating shaft 35 that is rotatably supported on the wall 30 in a downward cross direction of the lower shaft 25, and the reciprocating angular movement of the operating shaft 35 moves the overlooper 28 to a predetermined position. It is forced to swing back and forth along the orbit.

Further, the under looper 29 is attached to the upper end of a swinging rod 37 whose lower end is inserted into an operating shaft 36 which is rotatably supported on the wall 30 parallel to the operating shaft 35 for driving the over looper 28. The reciprocating angular movement of the operating shaft 36 forces the underlooper 29 to reciprocate along a predetermined trajectory.

Note that 3B, 38', and 39.39' are thread holes formed through the under-over looper 28 and under-looper 29, respectively, 40.41 is a thread groove, and 42.43 is a thread hole protruding from the back side of the over-looper 28 and under-looper 29. This is a piece of nail attached.

Reference numeral 44 denotes a drive shaft, which is rotatably supported between both sides of the wall portion 30 so as to be parallel to the lower shaft 25 and below the operating shafts 35 and 36. The sprocket 45 is inserted and the corresponding sprocket 46 is inserted into the lower shaft 25, and the chain 47 is wound between the sprockets 45 and 46 so that the drive shaft 44 rotates in the same direction as the lower shaft 25. In addition, eccentric cams 48 and 49 are fitted on the drive shaft 44, and the driven rods 50 and 51, which are driven up and down by the rotation of the eccentric cams 48 and 49, are connected to the operating shafts 35 of the overlooper 28 and underlooper 29. The over looper 28, the under looper 28 and the under looper are connected to the arm rods 52 and 58 fitted in the . This forces the looper 29 to swing.

In addition, 56 is the upper thread inserted into the lock stitch needle 7, 57 is the lower thread of the hook 26, and 58, 59, and 60 are inserted into the lock stitch needle 15, over looper 28, and under looper 29, respectively. It's a thread.

Next, to explain the operation of the lockstitch and lockstitch sewing machine according to the present invention, first, the needle 7,
Overlooper 2 at the position where 15 is the highest
8 has entered a position close to the front of the needle 15, and the under looper 29 has entered in front of the over looper 28 in a crossing manner.

When the lockstitch needle 7 descends from this state, the connecting member 16
The lock sewing needle 15 is also connected to the guide hole 2 by the guide pin 18.
As shown in FIG. 26 to intertwine the upper thread 56 and bobbin thread 57, while the lock stitch needle 15 descends on a predetermined inclined trajectory and enters through the piercing point A before the lock stitch needle 7. In this process, when the over looper 28 is moved backward, it passes through the loop 61 that is loosened and formed, and the under looper 29 is also moved backward at the same time.

Next, as shown in FIG. 11, when the needles 7 and 15 enter the ascending process, first the bobbin thread 5 entwined with the upper thread 56 by the lockstitch needle 7
7 is pulled out to form a lockstitch stitch, while as the lock stitch needle 15 rises, the thread 58 inserted through the needle 15 loosens and a loop 62 is formed, and the loop 62 is pulled out by the needle 1.
5, the thread 60 inserted into the under looper 29 is caught by the claw piece 43 of the under looper 29 which is interlocked with the advance, and the thread 60 inserted into the under looper 29 is captured and pulled up by the claw piece 42 of the over looper 28 which is interlocked with the advance at the same time. tooth 23
At this point, the fabric W is fed backwards to the needles 7 and 1 shown in FIG.
By returning to the raised position in step 5 and repeating the above operations, lockstitch and lockstitch stitches as shown in FIGS. 13 and 14 are simultaneously formed.

In short, the present invention consists of a lockstitch needle that is driven vertically up and down, a hook that cooperates with the counter to form lockstitch stitches, and a lockstitch needle that is driven forward and backward along a trajectory having a predetermined inclination angle. In a sewing machine equipped with a lock sewing needle and a looper mechanism that cooperates with the lock sewing needle to form lock sewing stitches, the lock sewing needle 15 is moved to a predetermined position via the needle bar 13. Supported so as to be able to slide up and down on a track having an inclination angle of
A guide pin 18 is inserted through the lower end of the needle bar 5 to which the lockstitch needle 7 is attached and the lower end of the lock stitch needle bar 13.
The needle 1 for lock sewing is connected to the connecting member 16 which is horizontally protruded.
5, the needle 15 for lock stitching moves up and down on a different inclined trajectory from the needle 7 for lock stitching that moves up and down in the vertical direction, and is synchronously interlocked by the connecting member 16. The interlocking mechanism is very simple, and since the lock sewing needle 15 moves up and down in a predetermined inclined trajectory, the overlooper 28 in the looper mechanism section 27 disposed inside the bed 2 The operating plane of the under looper 29 can be set on a vertical plane, and there is a gap between the piercing point A- of the lock sewing needle 15 and the piercing point B of the lock sewing needle 7. As a result, the looper mechanism section 27 can be placed at a reasonable location in terms of space, and the looper mechanism section 27 does not interfere with the lockstitch hook 26. Therefore, the hook 26 can be directly connected to the lower shaft 25 in the same way as a normal lockstitch-only sewing machine, resulting in an efficient mechanism, and it is possible to provide a sewing machine that can perform lockstitch and lockstitch at the same time. Its practical effects are enormous.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, and FIG. 1 is a front view of a lockstitch and lockstitch sewing machine according to the present invention, and FIG.
The figure is a partially cutaway side view of the same as the above, Figure 3 is a bottom view of the same as the above, Figure 4 is an exploded perspective view of the needle, Figure 5 is a side view of the needle when it is raised, and Figure 6 is a side view of the same as the above when it is lowered. , FIG. 7 is a front view of the looper mechanism, FIG. 8 is a sectional view taken along line XX in FIG. 13 is a plan view of the fabric after sewing, and FIG. 14 is a top and bottom view of the same. 3...Arm, 4...Head, 5...
... Needle bar, 7... Needle, 13... Needle bar, 15... Needle, 16... Connection member, 1
8...Guide pin, 26...Kama, 2
7... Looper mechanism section.

Claims (1)

[Scope of utility model registration request] A lockstitch needle that is driven vertically up and down, a hook that cooperates with the counter to form lockstitch stitches, and a lockstitch needle that is driven forward and backward along a trajectory with a predetermined inclination angle. needle and
In a sewing machine equipped with a looper mechanism that cooperates with the lock stitch needle to form a lock stitch, the lock stitch needle is slid up and down on a track having a predetermined inclination angle via a needle bar. The lower end of the needle bar to which the lock stitch needle is attached and the lower end of the needle bar for lock stitch are freely supported, and the lower end of the needle bar for lock stitch is connected to the lock stitch needle by a connecting member having a horizontally projecting guide pin inserted through the needle bar. A lockstitch and lockstitch sewing machine characterized in that the lockstitch and lockstitch are inserted and connected from a direction opposite to the direction of inclination of the lockstitch.