JPH026555B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a sewing machine equipped with a thread take-up device for taking up sewing thread in time with the rotation of the main shaft of the sewing machine.

(Prior Art) In a conventional sewing machine of this type, a thread holding end provided in a thread take-up device for holding the thread is reciprocated in the vertical direction to pick up the thread. .

(Problem to be Solved by the Invention) However, the vertical movement stroke of this thread holding end is determined in relation to the size of the loop created by the thread loop catcher, and it cannot be made smaller. This is a major obstacle when trying to make the entire sewing machine more compact by lowering the height of the sewing machine frame.

Furthermore, since this thread holding end reciprocates in the same vertical direction as the thread guide groove that guides the thread to the needle, there is a problem in that the thread may get entangled in the thread holding end during movement.

In addition, in conventional sewing machines, a thread take-up spring is provided on the thread supply path leading to the thread take-up device in order to absorb the loosened sewing thread picked up by the thread take-up device. Another problem was that threading was troublesome and time-consuming.

Structure of the Invention (Means for Solving the Problems) The present invention has been made by focusing on the above-mentioned problems, and in order to guide the sewing thread Y from the thread supply source 9 to the needle 4, Thread guide grooves 5 and 6 continuously formed in the horizontal and vertical directions on the sewing machine frame 1
In order to pick up the sewing thread Y guided in the thread guide grooves 5 and 6, there is a thread holder that can reciprocate in the front and rear directions orthogonal to the thread guide grooves 5 and 6 in synchronization with the rotation of the sewing machine main shaft 2. a balance device 21 having an end 24;
A locking body 33 in which a large number of fine bristles 34 are implanted so that the sewing thread Y can be locked, and a thread holding hole 2 that is recessed on the thread holding end portion 24 and for engaging and holding the sewing thread Y.
9, and a flat surface 35 provided on the thread holding end 24 for pressing the sewing thread Y held in the thread holding hole 29 against the large number of fine hairs 34. The locking body 33 is made to extend in a predetermined area in the vertical direction along the movement trajectory on at least one side of the movement trajectory, and the balance device 21
In order to lock the sewing thread Y that has been picked up and loosened by the large number of fine bristles 34, the locking body 33 is inserted into the sewing machine frame 1 with the large number of fine bristles 34 in contact with the thread holding end 24. It is located in

(Function) Therefore, in the sewing machine of the present invention, as the sewing machine main shaft 2 rotates, the thread holding end 2 of the thread take-up device 21
4 is reciprocated in the front-rear direction perpendicular to the thread guide grooves 5 and 6 to pick up the sewing thread Y, and
In the picked up state, the loosened sewing thread Y is attached to the locking body 33.
It is held and held by a large number of fine bristles 34 on the top. Therefore, unlike conventional sewing machines in which the thread holding end of the thread take-up device moves back and forth in the vertical direction, the height of the sewing machine frame can be lowered to make the entire sewing machine more compact. There is no occurrence of yarn entanglement in the holding end 24, and the structure can be simplified by omitting the yarn take-up spring on the yarn supply path, and the thread can be easily threaded onto the yarn supply path.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

Now, in the sewing machine of this embodiment, a sewing machine main shaft 2 is rotatably supported within a sewing machine frame 1.
It extends horizontally from side to side. A needle bar 3 is supported within the tip of the sewing machine frame 1 so as to be movable up and down, and a needle 4 is attached to the lower end of the needle bar 3. A horizontal thread guide groove 5 is formed on the front edge of the upper surface of the sewing machine frame 1 and extends linearly in the left-right direction. A longitudinal yarn guide groove 6 is formed extending in the direction of the needle, and the yarn guide grooves 5 and 6 constitute a yarn supply path to the needle 4. An opening 7 is formed in the front upper part of the sewing machine frame 1 so as to be located near the connecting portion of both thread guide grooves 5 and 6, and extends in the front-rear direction so as to be orthogonal to the main shaft 2 of the sewing machine.

A recess 8 is formed at the front edge of the upper surface of the sewing machine frame 1 so as to be continuous with the right end of the horizontal thread guide groove 5;
Inside the recess 8 is a needle thread bobbin 9 on which sewing thread Y is wound.
A spool pin 10 is provided for inserting and supporting the spool. A thread tension device 11 is provided on the sewing machine frame 1 so as to be located approximately in the center of the horizontal thread guide groove 5, and the thread insertion portion between the pair of thread tension discs 12 is located in the horizontal thread guide groove 5. They are arranged so as to extend linearly from side to side. Sewing machine frame 1 is positioned between spool pin 10 and thread tension device 11.
A thread guide body 13 is provided on the upper surface of the thread guide member 13 to apply a weak tension to the sewing thread Y moving along the lateral thread guide groove 5.

A thread hook 14 made of bent wire is attached to the sewing machine frame 1 so as to be located at the upper part of the front end inside the opening 7, and is guided along the horizontal thread guide groove 5. The sewing thread Y can be inserted and latched from above, and in this latched state, the sewing thread Y is stretched across the extension direction of the opening 7 in the width direction of the opening 7, and then inserted into the longitudinal thread guide groove 6. It is meant to lead. Thread guides 15, 16, and 17 are provided on the front surface of the sewing machine frame 1 and the lower end of the needle bar 3 to guide the sewing thread Y along the longitudinal guide groove 6 and into the needle hole of the needle 4. It's summery.

On the other hand, inside the sewing machine frame 1, there is a sewing machine main shaft 2.
A balance device 21 is provided for picking up the sewing thread Y in time with the rotation of the thread Y. That is, a take-up crank 22 is fixed to the left end of the sewing machine main shaft 2,
It is adapted to be rotated integrally with the sewing machine main shaft 2. At a position on the left side of the take-up crank 22 and offset from the center of rotation of the sewing machine main shaft 2, a take-up main body 23 is rotatably supported at its base end.
A thread holding end portion 24 serving as a holding portion for holding the sewing thread Y is provided at its free end. sewing machine frame 1
Inside, a balance support 25 is rotatably supported by a spindle 26 around a fixed axis parallel to the main shaft 2 of the sewing machine, and is rotatably connected at its free end to an intermediate portion of the balance body 23 by a pin 27. has been done.
Further, a needle bar crank 28 is provided between the thread take-up crank 22 and the needle bar 3, and as the thread take-up crank 22 rotates, the needle bar 3 is moved through the needle bar crank 28.
is designed to be reciprocated in the vertical direction.

In this embodiment, as is clear from FIG. 1, the fixed axis supporting the scale support 25 is located below the rotation center of the sewing machine main shaft 2 and on the front side of the sewing machine from the rotation center. . As a result, as the thread take-up crank 22 rotates, the thread holding end 24 of the thread take-up body 23 is reciprocated in the front-rear direction almost horizontally, and reaches the rearmost position when the sewing thread Y is picked up at its maximum, as shown by the chain line in FIG. It is starting to be moved. Further, when the thread holding end 24 of the thread take-up body 23 is moved to the vicinity of the forwardmost position as shown in FIG. Therefore, it is arranged close to the sewing thread Y stretched in a direction intersecting the direction of movement of the thread holding end 24.

As shown in FIG. 4, a thread holding hole 29 is formed on the thread holding end 24, and a part of the thread holding hole 29 has an open opening 3.
0 is set. A guide surface 31 is formed on the thread holding end 24 on one side of the opening 30, and as shown in FIG. Y, the sewing thread Y is passed through the opening 30 to the thread holding hole 2.
It is now designed to guide you inside 9th grade. Thread holding hole 29
An extending piece 32 is formed on the thread holding end 24 so as to extend above the opening 30 of the thread holding hole 29 to prevent the sewing thread Y in the thread holding hole 29 from falling out from the opening 30. There is.

As shown in FIGS. 1 and 3, a locking body 33 is arranged in the sewing machine frame 1 near the opening 7,
On one side of the movement trajectory of the thread holding end 24 of the thread take-up body 23, it extends in a predetermined area in the vertical direction along the movement trajectory. A large number of fine bristles 34 capable of locking the sewing thread Y are implanted on the surface of the locking body 33 and are arranged so as to be in contact with the thread holding end portion 24 . On the other hand, a flat surface 35 is formed on one side of the thread holding end 24 so as to be located within the plane of movement of the thread holding end 24, and a flat surface 35 is formed on one side of the thread holding end 24 so that the sewing thread Y inserted and held in the thread holding hole 29 is moved through the thread 34. As shown in FIG. 9, the sewing thread Y, which has been picked up by the thread holding end 24 of the thread take-up body 23 and loosened as the thread holding end 24 moves forward, is transferred to the numerous fine hairs 34 on the locking body 33. It is designed to be locked and held by.

Next, the operation of the sewing machine configured as described above will be explained.

Now, when threading is carried out in this sewing machine, the sewing thread Y is pulled out from the upper thread bobbin 9 inserted and supported by the thread spool pin 10, guided to the left, and passed from above the horizontal thread guide groove 5 to the thread guide groove. If you insert it within 5,
The sewing thread Y is inserted into the thread guide body 13, thread tension device 11, and thread hanging body 14, and is stretched in the transverse direction within the transverse thread guide groove 5. Thereafter, the end of the sewing thread Y is guided downward and inserted into the thread guide groove 6 from the front of the longitudinal thread guide groove 6, and is inserted and latched onto the thread guides 15 and 16, while the thread on the needle bar 3 When the needle 4 is hooked onto the guide body 17 and inserted into the needle hole of the needle 4, as is clear from FIGS. It is strung in the direction that intersects with.

When the sewing machine starts operating in this state, the thread take-up crank 22 is rotated as the sewing machine main shaft 2 rotates, and the needle bar 3 is lowered to the lowest point via the needle bar crank 28 and then raised. The needle thread loop is captured by the capture device, and the sewing thread Y in the above-mentioned wrapped state is tensioned. On the other hand, as the thread take-up crank 22 rotates, the thread holding end 24 of the thread take-up body 23 is moved forward from the rearmost position as shown in FIG. 5, FIG. 1, and FIG. , the sewing thread Y stretched on the thread hook 14 engages with the guide surface 31 on the thread holding end 24 and is guided and inserted into the thread holding hole 29, and the extending piece 32
This prevents it from falling off. Therefore, the thread can be automatically threaded onto the thread holding end 24 of the thread take-up body 23.

Thereafter, as the balance crank 22 rotates,
The thread holding end 24 of the balance main body 23 is
As shown in the figure, when the sewing machine is moved rearward from the frontmost position and reaches the rearmost position as shown by the chain line in FIG. 9, the sewing thread Y is picked up to the maximum and a stitch is formed. Then, as shown by the solid line in FIG. 9, when the thread holding end 24 is moved forward from the rearmost position,
The loosened sewing thread Y picked up by the thread holding end 24 is caught by a large number of fine hairs 34 on the locking body 33, and the slack of the sewing thread Y is absorbed. In this way, as the thread take-up crank 22 rotates, the thread holding end 24 of the thread take-up body 23 is reciprocated in the front and back direction, and when the thread holding end 24 moves backward, the sewing thread Y is picked up, and the thread holding end When the portion 24 moves forward, the slack of the sewing thread Y is absorbed by the numerous thin hairs 34 on the locking body 33.

Further, in this embodiment, the thread holding end 24 of the thread take-up body 23 is connected to the horizontal thread guide groove 5 and the longitudinal thread guide groove 6.
Since the thread is reciprocated in the front and back direction without following the upper thread supply path, the thread holding end 24 will never become entangled. Furthermore, when the thread holding end 24 is reciprocated in the front-rear direction, the many fine hairs 34 on the locking body 33 engage with the flat surface 35 on the thread holding end 24, thereby resisting its own elasticity. Since the bristles 34 are bent and bent, the fine bristles 34 are not worn out significantly.

Furthermore, as shown in FIG.
In a sewing machine in which the thread holding end 37 moves up and down, the spindle 39 of the thread take-up support 38 is disposed above the thread take-up crank in order to move the thread holding end 37 up and down. The vertical movement range of the sewing machine is located upward, making the sewing machine frame taller and larger. On the other hand, in the sewing machine of this embodiment, the spindle 26 of the take-up lever support 25 is arranged below the front of the take-up crank 22 so that the take-up take-up body 23 can move back and forth. The height of the machine frame can be lowered.

It should be noted that the present invention is not limited to the configuration of the embodiment described above, and for example, locking bodies 33 formed by implanting a large number of fine bristles 34 may be arranged on both sides of the movement trajectory of the thread holding end 24. It is also possible to change the configuration of each part as desired without departing from the spirit of the invention.

Effects of the Invention As described in detail above, in the present invention, the thread holding end of the thread take-up device is reciprocated in the front-rear direction perpendicular to the thread guide groove as the main shaft of the sewing machine rotates, and the sewing thread is picked up and removed. The thread holding end of the thread take-up device reciprocates in the vertical direction along the thread guide groove because the suture thread loosened in the pick-up state is held and held by a large number of fine bristles on the thread take-up body. Unlike other sewing machines, the height of the sewing machine frame can be lowered to make the entire sewing machine more compact.
Moreover, the thread take-up spring on the thread supply path is omitted,
This has the excellent effect of simplifying the structure and making it easier to thread the thread onto the thread supply path, as well as preventing the thread from becoming entangled with the thread holding end.

[Brief explanation of drawings]

Fig. 1 is a partial longitudinal sectional view showing an embodiment of a sewing machine embodying the present invention, Fig. 2 is a partial front view of the sewing machine, Fig. 3 is a partial plan view of the same, and Fig. 4 is a thread of the thread take-up body. A partial side view showing an enlarged view of the holding end; FIGS. 5 to 7 are partial longitudinal cross-sectional views of the sewing machine sequentially showing thread threading operations on the thread holding end; FIGS. 8 and 9 show the thread holding end. Fig. 10 is a partial longitudinal cross-sectional view of the sewing machine showing the sewing thread picking-up operation by the sewing machine and the sewing thread slack absorption action by the numerous fine hairs on the locking body. be. 1... Sewing machine frame, 2... Sewing machine main shaft, 4...
Needle, 5, 6... Thread guide groove, 21... Balance device, 2
3... Balance body, 24... Thread holding end, 25...
Balance support, 29...thread holding hole, 33...locking body, 34...fine hair, 35...flat surface, Y...sewing thread.

Claims (1)

[Scope of Claims] 1. Thread guide grooves 5 and 6 formed continuously in the horizontal and vertical directions in the sewing machine frame 1 in order to guide the sewing thread Y from the thread supply source 9 to the needle 4; In order to pick up the sewing thread Y guided in the guide grooves 5 and 6, the thread holding end 24 is movable back and forth in a direction orthogonal to the thread guide grooves 5 and 6 in synchronization with the rotation of the main shaft 2 of the sewing machine. a locking body 33 in which a large number of fine bristles 34 are implanted to be able to lock the sewing thread Y; A thread holding hole 29 is provided in the thread holding end portion 24, and the sewing thread Y held in the thread holding hole 29 is connected to the large number of fine hairs 3.
4, and on at least one side of the locus of movement of the thread holding end 24, the locking body 33 extends in a predetermined area in the vertical direction along the locus of movement; In order to lock the loosened sewing thread Y picked up by the thread take-up device 21 with the large number of fine bristles 34, the locking body 33 is attached to the sewing machine with the large number of fine bristles 34 in contact with the thread holding end 24. Frame 1
A sewing machine characterized by being placed inside the sewing machine. 2. The thread take-up device 21 is pivoted at a position on a take-up crank 22 that rotates together with the sewing machine main shaft 2 and is offset from the center of rotation of the sewing machine main shaft 2, and the thread holding end portion 24 is formed at the free end. It is rotatably supported around a fixed axis on the sewing machine frame 1 which is parallel to the main shaft 2 of the sewing machine and located on the front side of the sewing machine with respect to the rotation center of the main shaft 2, and has a free end in the middle part of the thread take-up main body 23. 2. The sewing machine according to claim 1, further comprising a take-up lever support 25 rotatably connected.