JPH0642628Y2 - Threading device for sewing machine - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention adjusts the tension of the upper thread and the lower thread used when sewing a sewing machine having at least one or more needles step by step only by using a looper. The present invention relates to a thread reeling device for a sewing machine, which is capable of preventing a phenomenon such as thread breakage and performing good sewing.

[0002]

2. Description of the Related Art Generally, sewing machines are capable of sewing various patterns by changing the number of needles and the ratio of the number of needles to the lower thread looper, and the ratio of the needle to the lower thread looper is 1. Two-to-one double chainstitch sewing machine, flat two-needle sewing machine with a needle to bobbin looper ratio of 2: 1, flat three-needle sewing machine with a needle to bobbin looper ratio of 3: 1, needle to bobbin thread There are various types such as seamer sewing machines with a looper ratio of 4: 1, and any one is used depending on the material to be sewn and the purpose of sewing.

[0003] A lockstitch sewing machine is generally used as a material to be sewn which has a relatively small stretchability. For example, when performing double thread double chain stitching when the sewing machine has one needle. After the needle penetrates through the material to be sewn and is located at the lowest point, the needle rises while forming a loop in the needle thread, and the lower thread looper enters and engages in the loop of the needle thread. Next, after the material is fed to the next stitch by the feeding mechanism, the lower thread looper performs a retracting operation with respect to the needle, and at the same time, the needle enters the loop of engagement between the lower thread and the needle thread of the looper, The needle reaches the lowest point again when the lower thread looper is completely retracted from the needle. By repeating the above-mentioned operations, the double chain stitch for the material to be sewn is completed. Further, in order to neatly perform sewing with respect to the material to be sewn as described above without causing twitching or looseness, it is determined whether or not the tension of the upper thread and the lower thread is properly set to determine whether the sewing state is good or bad. The mechanism that feeds the yarns with the proper tension of both yarns is the most important point during sewing. In particular, when the needle and the bobbin looper always operate in association with each other, it is necessary to form the loop yarn between the needle and the lower thread looper continuously and smoothly while adjusting a predetermined tension. Adjusting the lower thread tension of the lower thread looper, which requires repeated thread tensioning, thread slackening, thread returning, and thread pulling operations, has been an important issue that is closely related to the quality of sewing.

By the way, in the conventional looper sewing machine, as described above, in order to continuously adjust the lower thread tension of the lower thread looper with respect to the needle in accordance with the retracting stage of the needle, as shown in FIG. There was no other way than using a claw-shaped rotating cam.

That is, the bobbin thread tension adjusting mechanism for the bobbin thread looper using the claw-shaped rotary cam shown in FIG. 1 has a groove 24 for installing the rotary cam in the lower or inside of the sewing machine arm 22 of the sewing machine main body 21 or in the sewing machine bed 23. And a claw-shaped rotary cam 25 is installed inside the groove 24.
Is a method of pulling, pulling, loosening, etc., the lower thread by utilizing the hooking and releasing of the flat surface 26 of the end portion 27 of the flat surface 26. It is designed to adjust the tension of the lower thread,
It is well known that almost all sewing machines adopt this mechanism.

[0006]

However, in the above-described thread reeling device of the looper sewing machine, the bobbin thread looper adjusts the bobbin thread tension of the bobbin thread looper at right angles to the direction in which the sewing machine arm 22 is installed. Since the lower shaft looper mechanism is configured so as to be able to rotate and the lower thread needs to be arranged so as to be engaged at right angles to the rotation direction of the rotating cam 25, the lower thread is pulled by hand, that is, the thread slackening operation. During the subsequent thread tensioning operation, the rotary cam installation groove 24 of the sewing machine bed 23
There have been many problems that the phenomenon of winding the yarn into the inside or the phenomenon of pulling in the yarn occurs, which causes yarn breakage.

Further, in connection with the thread breakage problem, the lower thread is provided in the lower thread guide holes 251, 251 arranged on both sides of the rotary cam 25 in order to dispose the lower thread again at the engaging position of the rotary cam 25. When the thread is inserted, the rotary cam 25 is installed at the end as much as possible, and moreover, the bobbin thread needs to be inserted in the lateral direction on both sides orthogonal to the cam 25, which makes the insertion operation difficult. However, there is also a drawback that it wastes time and labor.

Further, in the thread reeling device for the looper sewing machine as well, since the structure is complicated and the complicated structure is adopted, the manufacturing cost of the sewing machine is high, and further the rotary cam as described above is used. Since the lower shaft also rotates at a high speed in the same manner as the rotation of 25, the rotary cam 25
In addition to the entrainment phenomenon and the entrainment phenomenon of No. 2, the phenomenon of winding around the lower shaft also occurs, and a great deal of labor is required to remove and redeploy the wound bobbin thread.

Therefore, in recent years, in particular, it has been strongly desired to develop a lower shaft looper mechanism having a lower thread tension adjustment in a sewing machine, which does not cause a thread breakage phenomenon, can easily perform thread insertion work, and can be carried out at low cost. However, the present situation is that the means for satisfying the demand has not yet been developed, and the thread reeling device of the looper sewing machine must be developed or improved according to the development of the mechanism. Therefore, it is the actual situation that active development is not possible.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and the tension of the upper thread and the lower thread used when sewing a sewing machine is repeated by the upper and lower sides of the needle and the lower thread separating member. It is possible to always adjust in steps only by advancing and retreating, and it is possible to adjust the tension for bobbin thread looper to be always in a good condition when feeding, so that twitching and slackening of the material to be sewn, The purpose of the present invention is to provide a thread take-up device for a sewing machine having an inexpensive and simple structure, which prevents a phenomenon such as thread breakage or bobbin thread pull-in due to unstable tension and enables good sewing. is there.

Another object of the present invention is to provide a bobbin thread separating member for facilitating re-insertion work when a bobbin thread breaks and performing as good sewing as possible. Is.

[0012]

DISCLOSURE OF THE INVENTION A thread reeling device for a sewing machine according to the present invention is a sewing machine having at least one or more needles, and the thread feeding device of the sewing machine has an upper shaft which rotates in association with rotation of a pulley. An upper shaft mechanism for moving a needle bar up and down linked to an upper shaft equipped with a bevel gear, and a lower shaft looper provided at the front end of the mechanism, interlocked with a rigid shaft that meshes with the upper shaft bevel gear of the mechanism at the same ratio. A lower shaft looper mechanism that reciprocally advances and retracts the lower thread separating member, and a horizontal feed arm and a vertical feed that are linked to these through a forked lot and a crank lot that move up and down in conjunction with the rotation of the upper shaft. The present invention is characterized in that the feed mechanism pivotally mounted on the shaft is moved forward and backward and circularly, and the feed dog provided on the feed base is moved circularly and forward and backward.

According to the present invention, the lower shaft looper mechanism having the above structure is provided with a hard shaft having a hard shaft bevel gear at the upper end that meshes with the upper shaft bevel gear that rotates in conjunction with the rotation of the pulley at the same ratio. An advancing / retreating shaft eccentrically attached to one side of a rigid rotating shaft attached to the lower end of the shaft and pivotally supporting the base end thereof, and a front end bobbin thread looper connected to the extreme end of the advancing / retreating shaft are arranged so as to be advancing and retracting. It is also characterized in that it is composed of a lower shaft and a lower thread separating member fixed to the rear upper part of the connecting portion of the lower shaft.

Further, according to the present invention, the bobbin thread separating member of each of the above-mentioned constitutions forms a curved hole at a base end portion thereof, and a lower base end of the curved hole is protruded upward to a lower thread hooking hook. Characterized in that a pair of locking plates provided with parts are integrally formed with a certain interval, and a bobbin thread insertion hole is provided in the vicinity of at least one of the locking plates. To do.

[0015]

Therefore, the thread reeling device of the sewing machine of the present invention has the following effects by being constructed as described above. That is, in the thread reeling device of the sewing machine of the present invention, the upper shaft mechanism moves the needle bar up and down,
The lower shaft looper mechanism and the feed mechanism are interlocked, and the tension between the upper thread and the lower thread can be adjusted by the upper and lower parts of the needle bar and the lower thread separating member of the lower shaft feed mechanism. It is possible to prevent a phenomenon such as a bobbin thread breakage due to unstable tension and a bobbin thread pull-in due to the rotation of a cam without requiring a member, and it is possible to always perform stable sewing.

Further, according to the present invention, since the lower shaft looper mechanism does not use the claw-shaped rotary cam, it is not necessary to rotate the lower shaft, and the lower thread separating member is configured to be repeatedly moved forward and backward. In addition to the relatively expensive hard shaft bevel gear and lower shaft bevel gear that are required to rotate the lower shaft, there is no need for a claw-shaped rotating cam, and it can be manufactured at low cost, and in the sewing machine bed groove due to the rotation of the lower shaft and cam. It is possible to prevent as much as possible the winding phenomenon, the drawing phenomenon, and the yarn breakage phenomenon of the yarn.

Further, according to the present invention, the bobbin thread separating member is constructed so that the bobbin thread passing through the bobbin thread inserting hole for the bobbin thread separating member can be easily performed. Easy and does not require wasted time and effort.

[0018]

[Embodiment 1] FIG. 3 shows an embodiment of a three-needle flat rotary sewing machine which employs the thread reeling device of the present invention, and FIG. 10 shows the sewing machine of the present invention. Is an example of a full-rotation rotary type single needle lockstitch sewing machine that employs the above thread reeling device. 2 and 4 show one embodiment of the internal schematic mechanism of FIGS. 3 and 10, and FIG. 5 is linked to the upper shaft 32 of the upper shaft mechanism 31 of FIGS. 2 and 4. Lower shaft looper mechanism 41 and feed mechanism 5 that operate
FIG. 6 to FIG. 9 are explanatory views showing an example of the operating state of the lower thread separating member 81 connected to the lower shaft looper mechanism 41.

As shown in FIG. 2, FIG. 3, FIG. 4, and FIG. 5, the sewing machine 71 has a sewing machine arm 73 disposed above the sewing machine bed 72, and an upper shaft mechanism 31 incorporated in the sewing machine arm 73 is used. A needle 74 attached to a lower end of the sewing machine arm 73 is arranged in the sewing machine bed 72 so as to move up and down by pulling the upper thread by hand, and is operated in conjunction with the upper shaft mechanism 31. A bobbin thread separating member 81 that is attached to the shaft looper mechanism 41 and is capable of advancing and retreating, a bobbin thread looper 46 that is provided at the tip of the lower shaft looper mechanism 41 that feeds the bobbin thread, and the upper shaft mechanism 31.
By linking with the feed mechanism 51 that moves the feed dog 58 in an arc and moves back and forth in conjunction with the above, the material to be sewn can be stably sewn.

As shown in FIGS. 2 and 4, the upper shaft mechanism 31 is provided inside the sewing machine arm 73, and the pulley 3 provided on the side of the sewing machine arm 73.
2, an upper shaft 33 having an upper shaft bevel gear 331 whose base end is concentrically connected to the pulley 32, a crank 34 which is concentrically connected to the extreme end of the upper shaft 33, and the crank 34, a needle bar connecting rod 35 eccentrically connected to the needle bar 34, a needle bar holder 36 that is disposed orthogonally to the upper shaft, is pivotally attached to the needle bar connecting rod 35, and moves up and down, and a needle connected thereto. Stick 37
And an upper needle bar metal 38 for guiding the needle bar 37 up and down and a lower needle bar metal 39, the rotation of the pulley 32 is transmitted to the upper shaft 33, and the crank 34 is rotated by the rotation of the upper shaft 33. Then, the rotational movement of the crank 34 is converted into vertical advancing / retracting movement by the needle bar 37 via the needle bar connecting rod 35 eccentrically connected to the crank 34, and the needle 74 attached to the lower end of the needle bar 37 is moved up and down. It is made to repeatedly move back and forth.

The lower shaft looper mechanism 41 is shown in FIGS.
Further, as shown in FIG. 5, a hard shaft 42 having a hard shaft bevel gear 421 that meshes with the upper shaft bevel gear 331 of the upper shaft 33 at the same ratio is mounted on the upper end, and the lower end of the hard shaft 42 is concentrically attached. The rigid rotation shaft 43, the forward / backward movement shaft 44 eccentric to one side of the rotation rigid shaft 43 and pivotally supporting the base end thereof, and the forward / backward movement shaft 44.
A lower shaft 45 that moves forward and backward by being connected to the extreme end of the
A lower thread looper 46 that is connected to the front end of the lower shaft 45 and moves back and forth in synchronization with the lower shaft 45; and a lower thread separating member 81 fixed to the upper rear part of the connecting portion 451 of the lower shaft 45 via a connecting rod 452. The hard shaft bevel gear 4 configured to mesh the rotation of the pulley 32 of the upper shaft mechanism 31 with the upper shaft bevel gear 331.
The forward-backward-moving shaft 4 which is transmitted to the hard shaft 42 via 21 at the same ratio (1: 1) and is eccentrically supported by the rotating hard shaft 43 of the hard shaft 42.
The rotary motion of the rigid shaft 42 is converted into a left and right forward / backward motion by the lower shaft 45 via 4, so that the lower thread looper 46 attached to the tip of the lower shaft 45 is repeatedly moved forward and backward. The repeated movement of the needle 74 of the upper shaft mechanism 31 and the lower thread looper 46 of the lower shaft looper mechanism 41 is converted so that the rotation of the same pulley 32 is synchronously moved at a ratio of 1: 1. Therefore, the needle 74 and the bobbin thread looper 46 are repeatedly moved forward and backward by the entrainer.

The feed mechanism 51 is for feeding the material to be sewn in one direction by the circular movement and the forward and backward movement of the feed dog 57, and as shown in FIG. 7, the forward and backward movement mechanism 52 and the circular arc movement mechanism 61. It is composed by combining with.

That is, as shown in FIG. 5, the forward / backward moving mechanism 52 is provided with a feed cam on the upper shaft 33 of the upper shaft mechanism 31 and an angular mass, and the base end of the angular mass is eccentrically arranged. A two-pronged lot 53 that is attached and can move up and down at the very end,
A horizontal feed arm 55 fixed to one end of the horizontal feed shaft 55 so as to be movable in an arc through a horizontal feed arm 54 pivotally fixed to the extreme end of the forked lot 53, and a horizontal feed shaft fixed to the other end of the horizontal feed shaft 55. A feed table 57 that pivots this base through a feed table shaft 56;
The feed dog 57 is provided on the upper portion of the feed base 57.

Further, the circular arc moving mechanism 61 has a crank lot 62 whose base end is eccentrically attached to the feed cam on the upper shaft 33 of the upper shaft mechanism 31 and whose extreme end is vertically movable, and the crank lot 62. A vertical feed shaft 63 having one end attached to 62 and moving up and down, and a base end attached to the other end of the vertical feed shaft 63, have their extreme ends pivotally attached to the extreme part of the feed base 57. An upper and lower feed platform arm assembly 64, and a connecting member 65 provided substantially in the center of the crank lot 62, and fixed to one side of the connecting member 65 in parallel with the crank lot 62 and slidable to the left and right ends. A slide rod 66 in which a fixing member 67 is pivotally attached to
And a connecting portion 45 of the lower shaft looper mechanism 41.
By fixing the fixing member 67 of the slide rod 66 to the slide rod holding member 452 provided in No. 1, the vertical feed movement can be performed and the looper back and forth movement can be performed.

Therefore, the feed table 57 connected to the horizontal feed table shaft 56 of the forward / backward moving mechanism 52 and the vertical feed table arm assembly 64 of the circular arc moving mechanism 61 has the forward / backward movement of the forward / backward moving mechanism 52 and the circular arc moving mechanism 61. The feed dog 58 provided on the feed base 57 horizontally operates from the rear direction to the front direction in the first stage, and further moves in the front direction in the second stage. The stepwise operation of moving obliquely upward, horizontally moving from the front to the rear in the third step, and further moving downward in the oblique rearward in the fourth step is repeated.

The lower thread separating member 81 is shown in FIGS.
In order to adjust the tension of the bobbin thread in a stepwise manner, the bobbin thread separating member 81 has a curved hole 83 formed at the base end thereof. ,
A lower thread hooking portion 84 is provided in which the lower base end of the curved hole 83 is projected upward, and a lower thread insertion hole 85 is provided in the suburbs.
And a first locking plate 82 having substantially the same shape as the first locking plate 82, a curved hole 83 is formed at the base end, and the lower base end of the curved hole 83 is slightly upward. A pair of second locking plates 82 'provided with the protruding lower thread hooking portion 84 are integrally formed so as to face each other, and the whole thereof is integrated with the lower shaft looper mechanism 41.
The lower shaft 45 is fixed at the upper rear part of the connecting portion 451 via a connecting rod 452, and can be moved left and right by moving the lower shaft 45 forward and backward.

Reference numeral 86 is a first lower thread guide plate having a lower thread guide hole 86 'provided near the lower thread hooking portion 84 of the second locking plate 82'. Is a second lower thread guide plate that is provided upright near the lower thread hooking portion 84 of the first locking plate 82 and has a lower thread guide hole 88 that faces the lower thread guide hole 86 '. .

Further, numeral 89 is a third lower thread guide plate for guiding the lower thread to the lower thread looper 46 connected to the front end of the lower shaft 45, and the guide plate 89 has a lower thread guide hole 891. The third lower thread guide plate 89 is provided with the lower thread guided through the lower thread guide holes 86 'and 88 of the first lower thread guide plate 85 and the second lower thread guide plate 87. The lower thread guide hole 891 guides the inside of the sewing machine bed 72, and the lower thread looper 46
It can be attached to.

The lower thread separating member 81 is shown in FIGS.
The above-mentioned operations are continuously and sequentially repeated, and the needle 74 of the upper shaft mechanism 31 is continuously moved up and down in association with each operation.

[0030]

[Detailed operation of the first embodiment] The relationship between the lower thread by the lower thread separating member 81 and the upper thread by the needle 74 of the upper shaft mechanism 31 and the respective operations by the thread reeling device of the sewing machine of the present invention configured as described above, will be described. This will be sequentially described with reference to FIGS. 6 to 9.

First of all, when the needle 74 withdraws from the material to be sewn and is located at the uppermost point, the lower thread looper 46 is in the state closest to the needle 74, and in this case, the lower thread separating member. 81 also approaches the lower thread looper 46 in synchronization with the lower thread as shown in FIG.
And both lower thread hooking portions 84, 84 of the second locking plate 82 '
The thread tensioning operation released from is performed to prepare for the next operation.

Secondly, when the needles 74 are positioned in a state of being slightly lowered with respect to the material to be sewn, the lower thread looper 46 is in a state of being slightly retracted from the needles 74, and in this case, the lower thread separating member 81. Also, as shown in FIG. 7, the lower thread is retracted in synchronization with the lower thread looper 46, and the lower thread is moved to the first locking plate 82.
And both lower thread hooking portions 84, 84 of the second locking plate 82 '
The yarn is slackened by and becomes a state in which it is engaged.

Third, when the needle 74 is positioned to start penetrating the material to be sewn, the lower thread looper 46 is further retracted from the needle 74, and in this case, the lower thread separating member 81 is also. As shown in FIG. 8, the lower thread is further retracted in synchronism with the lower thread looper 46, and the lower thread is engaged with the lower thread hooking portion 84 of both the first locking plate 82 and the second locking plate 82 '.・
84 The thread pulling operation is performed to bring the thread into the most engaged state.

Fourth, when the needles 74 penetrate the material to be sewn and are located at the lowest points, the lower thread looper 46
Is retracted farthest from the needle 74. In this case, the bobbin thread separating member 81 also retreats in synchronization with the bobbin thread looper 46 as shown in FIG. Both bobbin thread hooking engaging portions 84 of the plate 82 and the second locking plate 82 '
-It is detached from 84 and positioned in the curved hole 83, and the bobbin thread is returned to prepare for the next step.

Further, the bobbin thread separating member 81 reverses the respective operations from the fourth to the first to return to the first state position where the engagement with the bobbin thread is released. Then, the above-mentioned operations are continuously and sequentially repeated to make the needle 74
The slack and tension of the lower thread of the lower thread looper 46 corresponding to the above are appropriately adjusted.

[0036]

[Embodiment 2] The thread winding device of the present invention can be applied to a half-rotating hook type lockstitch sewing machine, and FIGS. 11 and 12 show a half-rotating hook type lockstitch adopting the thread winding device of the present invention. It is explanatory drawing which showed the relationship with the lower shaft looper mechanism 41 'which works in conjunction with the upper shaft mechanism 31' of a sewing machine.

Like the full-rotation rotary hook type lockstitch sewing machine, the half-rotation rotary hook type lockstitch sewing machine has a sewing machine arm provided on the upper portion of the sewing machine bed, and an upper shaft mechanism 31 'incorporated in the sewing machine arm allows A needle attached to the lower part of the tip of the sewing machine arm is arranged in the sewing machine bed such that the needle is pulled up and moved up and down.
1'movable bobbin thread separating member attached to a bobbin looper mechanism 41 ', and bobbin thread provided at the tip of the bobbin looper mechanism 41' for feeding bobbin thread The looper and the feed mechanism for moving the feed dog in a circular motion and back and forth in conjunction with the upper shaft mechanism 31 'are adapted to perform stable sewing on the material to be sewn.

The lower shaft looper mechanism 41 'shown in FIGS. 11 and 12 is a rigid shaft which is vertically coupled with the upper shaft 33' or the upper shaft 33 "or the upper crank 331 'or the upper crank 331". 42 ', a rocking rigid shaft 43' connected to the lower end of the rocking rigid shaft 42 ', and an advance / retreat shaft 44' eccentric to one side of the rocking rigid shaft 43 'to pivotally support its proximal end. Advance axis 4
A lower shaft which is connected to the extreme end of 4'to move forward and backward, a lower thread looper which is connected to a front end of the lower shaft and moves forward and backward in synchronization with the lower shaft, and a connecting portion of the lower shaft at a rear upper part. The upper shaft mechanism 3 is composed of a lower thread separating member fixed via a connecting rod.
1 ′ or the rotation of the pulley 32 ′ or the pulley 32 ″ of the upper shaft mechanism 31 ″ is transmitted to the hard shaft 42 ′ at the same ratio (1: 1) via the upper shaft crank 331 ′ or the upper shaft crank 331 ″, Oscillation of the rigid shaft 42 'The vertical motion of the rigid shaft 42' is converted into the left and right motions of the rigid shaft 42 'via the advancing / retreating shaft 44' which is eccentrically supported by the rigid shaft 43 ', and is attached to the tip of the lower shaft. The looper for bobbin thread is repeatedly moved back and forth from side to side.

[0039]

[Embodiment 2] According to the thread reeling device for a sewing machine of the present invention constructed as described above, the upper shaft mechanism 31 'or the upper shaft mechanism 3 can be used even when used in a sewing machine for a half-turn rotary hook.
The needle is repeatedly moved up and down by 1 "to move the upper shaft mechanism 31 '.
Alternatively, the bobbin thread separating member attached to the bobbin looper mechanism 41 ′ which operates in conjunction with the bobbin shaft mechanism 31 ″ moves forward and backward, and the bobbin thread looper mechanism 4 for feeding the bobbin thread
Since the lower thread looper provided at the tip of 1'is also capable of advancing and retreating in synchronization, the feed mechanism 51 is provided so as to interlock with the upper shaft mechanism 31 'or the upper shaft mechanism 31 ",
By moving the feed dog in an arc and back and forth, it is possible to perform stable sewing on the material to be sewn.

[0040]

EFFECT OF THE INVENTION The thread reeling device for a sewing machine according to the present invention applies the tension of the upper thread and the lower thread used when sewing the sewing machine to the upper and lower needles by the upper shaft mechanism and the lower thread looper by the lower shaft looper mechanism to repeat the looper. Since it is configured so that it can be adjusted in stages in an appropriate manner only by advancing and retracting and repeating advancing and retracting the bobbin thread separating member, it is possible to rotate the claw-shaped rotary cam in the direction orthogonal to the installation direction of the sewing machine arm. Unlike conventional sewing machines that adjust bobbin thread engagement, it does not require a relatively expensive hard shaft bevel gear or lower shaft bevel gear, and a claw-shaped rotating cam. It is possible to eliminate the phenomenon of bobbin thread pulling into the groove for installing the rotary cam at the time,
It is possible to obtain a sewing machine that is inexpensive and has a simple structure that can perform good sewing. Further, according to the present invention, since the lower thread guide plate having the lower thread guide holes is provided on both sides of the lower thread separating member, unlike the case of using the conventional rotary cam, the tension of the lower thread is judged. In addition to enabling adjustment by a member, the work is completed only by inserting the lower thread into the lower thread guide hole. Therefore, even in the unlikely event of a lower thread breakage, the lower thread insertion work is easy and You can save time. Therefore, the thread take-up device for a sewing machine of the present invention can completely change the basic concept to solve the conventional drawbacks and problems, satisfy various needs, and be applied to any looper sewing machine using a plurality of needles. It was made possible, and its effect was enormous.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a bobbin thread tension adjusting mechanism for a bobbin thread looper using a claw-shaped rotating cam used in a conventional sewing machine.

FIG. 2 is an explanatory view showing an embodiment of the thread reeling device of the sewing machine of the present invention.

FIG. 3 is a perspective view showing an embodiment of a full-rotating rotary type three-needle sewing machine using the thread reeling device of the present invention.

FIG. 4 is an explanatory view showing an embodiment of the thread reeling device of the sewing machine of the present invention.

FIG. 5 is an explanatory view showing an embodiment of the thread reeling device of the sewing machine of the present invention.

FIG. 6 is an explanatory view showing an embodiment of a lower thread separating member used in the thread reeling device of the sewing machine of the present invention.

FIG. 7 is an explanatory view showing an embodiment of a lower thread separating member used in the thread reeling device of the sewing machine of the present invention.

FIG. 8 is an explanatory view showing an embodiment of a lower thread separating member used in the thread reeling device of the sewing machine of the present invention.

FIG. 9 is an explanatory view showing an embodiment of a lower thread separating member used in the thread reeling device of the sewing machine of the present invention.

FIG. 10 is a perspective view showing an embodiment of a full-rotation rotary type single needle lockstitch sewing machine using the thread reeling device of the present invention.

FIG. 11 is an explanatory view showing an embodiment in which the thread reeling device of the sewing machine of the present invention is used in a half-turn rotary hook type lockstitch sewing machine.

FIG. 12 is an explanatory view showing an embodiment in which the thread reeling device of the sewing machine of the present invention is used in a half-rotation rotary hook type lockstitch sewing machine.

[Explanation of symbols] 31 upper shaft mechanism 31 ′ upper shaft mechanism 31 ″ upper shaft mechanism 32 pulley 32 ′ pulley 32 ″ pulley 33 upper shaft 33 ′ upper shaft 33 ″ upper shaft 331 upper shaft bevel gear 331 ′ upper shaft bevel gear 331 ″ upper Shaft bevel gear 37 Needle bar 41 Lower shaft looper mechanism 41 'Lower shaft looper mechanism 42 Hard shaft 42' Hard shaft 421 Hard shaft bevel gear 43 Rotating hard shaft 43 'Swing hard shaft 44 Advance / retreat shaft 44' Advance shaft 45 Lower shaft 46 Lower thread Looper 51 Feed mechanism 52 Forward-backward movement mechanism 53 Bifurcated lot 54 Horizontal feed arm 55 Horizontal feed shaft 57 Feed base 58 Feed tooth 61 Arc movement mechanism 62 Crank lot 63 Vertical feed shaft 74 Needle 81 Blower thread separating member 82 First locking Plate 82 'Second locking plate 83 Curved hole 84 Engagement portion for hooking

Claims (3)

[Scope of utility model registration request] 1. In a sewing machine having at least one or more needles, a thread feeding device of the sewing machine is linked to an upper shaft having an upper shaft bevel gear that rotates in conjunction with the rotation of a pulley to move a needle bar up and down. A lower shaft looper mechanism that interlocks with an upper shaft mechanism that allows the upper shaft bevel gear to mesh with the upper shaft bevel gear at the same ratio to reciprocally move the lower thread separating member back and forth in synchronization with the lower thread looper provided at the front end. Then, through a forked lot and a crank lot that move up and down in conjunction with the rotation of the upper shaft, the horizontal feed arm connected to them and the feed base pivotally attached to the vertical feed shaft are moved back and forth and circularly. A thread winding device for a sewing machine, comprising: a feed mechanism for moving a feed dog provided on the feed base in an arc and back and forth. 2. The lower shaft looper mechanism according to claim 1, wherein the upper shaft is provided with a hard shaft bevel gear that meshes with the upper shaft bevel gear that rotates in conjunction with the rotation of the pulley at the same ratio, and the lower shaft looper mechanism is provided at the lower end of the hard shaft. An advancing / retreating shaft that is eccentrically attached to one side of the attached rotating rigid shaft and pivotally supports the base end thereof, and a lower shaft that is connected to the extreme end of the advancing / retreating shaft and that is provided with a bobbin thread looper at the front end that is capable of advancing and retracting. 2. The thread winding device for a sewing machine according to claim 1, further comprising: a lower thread separating member fixed to a rear upper portion of the connecting portion of the lower shaft. 3. The lower thread catching pulling portion in which the lower thread handling member of claim 1 or 2 has a curved hole formed at a base end portion, and a lower base end of the curved hole is projected upward. Characterized in that a pair of locking plates provided with is integrally formed with a certain interval, and a bobbin thread insertion hole is provided in the vicinity of at least one locking plate of the locking plate. A thread reeling device in the sewing machine according to claim 1 or 2.