KR20090104763A - Upper-thread clamp mechanism in sewing machine - Google Patents

Abstract

PURPOSE: An upper thread clamping device of a sewing machine is provided to prevent formation of a loop formed by sewing an end of upper thread on the rear side of fabric, and to prevent failure rates in sewing. CONSTITUTION: An upper thread clamping device of a sewing machine includes an upper thread sticking support unit, a driving unit(27), and a thread removing unit(30). The upper thread sticking support unit catches an end of the upper thread, and supports the end of the thread. The driving unit drives the upper thread sticking support unit. The end of the upper thread is caught on a location which is separated from an up and down movement route. The thread removing unit removes the end of the thread from a pull-up route of the upper loop.

Description

Upper thread clamping device of sewing machine {UPPER-THREAD CLAMP MECHANISM IN SEWING MACHINE}

The present invention relates to an upper thread clamping device of a sewing machine for fitting the thread end of the upper thread inserted into the sewing needle at the beginning of sewing to the lower side of the needle plate.

Conventionally, the thread end of the upper thread (needle thread) inserted into the thread through hole of the sewing needle at the start of sewing is held under the needle plate for the reason of reliably forming the needle stitch at the beginning of sewing. The upper thread clamping device has been proposed (see Patent Document 1, for example).

In this upper thread clamping device, at the start of sewing, a thread trapping part (perforated hole) formed in a frame shape is disposed on the shanghai path of the sewing needle, and the thread at the first needle at the start of sewing. After capturing the upper thread inside the capturing section, the thread capturing section is spaced apart from the shanghai path of the sewing needle, and then contacted and spaced so as to face the first clamping section constituting a part of the thread capturing section and the first clamping section. The thread end of the upper thread, in particular, the vicinity of the tip (thread end) of the upper thread is sandwiched between the arranged second fitting supports, and then a predetermined number of needles, for example, two (two needles) or three (three needles) ) After dropping the needle, it is formed to release the thread end of the upper thread.

[Patent Document 1] Japanese Patent Laid-Open No. 2004-167007

However, in the conventional upper thread clamping device, there is a problem in that a tip end side of the threaded upper end of the threaded upper thread is sewn into the needle stitches on the back side of the fabric, and a loop passing through the thread trapping part may be formed.

 If such a loop is formed, the loop cannot be pulled out of the thread catching portion, that is, if the threaded end of the upper thread does not fall out of the thread catching portion, a cloth shift (sewing-like shift), a thread cut, a malfunction of the device, etc. may occur. It is not possible to obtain stable needle stitches.

Here, the back side of cloth means the surface of the needle board side of the cloth as a sewing object put on the needle board at the time of sewing.

 The loop of the upper thread from the thread capturing section will be described in detail with reference to FIGS. 25 to 28.

 In the conventional upper thread clamping device 101, when the first needle drop (first needle) at the start of sewing is made, the sewing needle N moves along the shank east route NL. At this time, the sewing needle N is placed on the needle plate P provided in the bed portion MB in a state where the upper thread T is inserted into the thread passage hole Na formed near the distal end portion. (C) is punctured and lowered below the needle hole Pa of the needle plate P. FIG. The lowering of the sewing needle N is made by passing through a thread trapping portion 103 (transmission hole) having a rectangular plane formed on the first fitting member 102. And, when the sewing needle (N) rises, the upper thread loop (TL) is formed. The upper thread loop TL is hung from the cutting edge Ka of the kiln K, so that the tip Ta is draped downward, so that the upper thread T is formed inside the thread catching part 103. Is captured. After the upper thread T is captured, the thread capturing part 103 is spaced apart from the side of the shank east path NL of the sewing needle N, and then, a part of the inner surface 103a of the thread capturing part 103. The first fitting support 104 and the second fitting support 106 formed on the second fitting support member 105 (disposed to face the first fitting support 104) are formed. The upper thread T is sandwiched between and (FIG. 25).

 In this state, if the number of needles set in advance is also dropped, for example, when the sewing needle N is shaken once (second needle) or two times (second needle and third needle), the upper thread T is shown. Knot the lower thread and knots, and needle stitches S are formed on the cloth C placed on the needle plate P. Then, before the needle drop (third needle or fourth needle) after the upper thread T and the lower thread have knotted, they are sandwiched between the first fitting support 104 and the second fitting support 106. The upper thread T is released, and needle stitches S are sequentially formed in this state. In addition, the tip Ta of the upper thread T is pulled out of the thread capturing unit 103 by being fed the cloth C with the progress of sewing.

Here, the thread end TA which is connected to the blood-supporting part of the upper thread T clamped between the 1st clamping part 104 and the 2nd clamping part 106 at the 1st needle is 2 needles. If it is located on the pulling path of the upper thread loop TL after the second, for example, the passage path of the cutting edge Ka of the kiln K, the thread end portion is formed inside the upper thread loop TL of the second needle. TA) (FIG. 26).

At this time, the length of the thread end portion TA of the upper thread T held between the first fitting support 104 and the second fitting support 106, in detail, the tip from the fitting supporting portion of the upper thread T. When the length (hereinafter referred to as "length of thread end") to (Ta) is longer than the distance from the clamping part of the upper thread T to the needle dropping point DP of the cloth C, the upper thread ( The threaded end TA of T) enters the upper thread loop TL, and the upper thread T is pulled up by a threader (not shown), so that the upper end thread T of the upper thread T together with the upper thread loop TL ( TA) is pulled up (FIG. 27).

Therefore, when the pulling up of the upper thread T is completed, the tip Ta side of the threaded end TA of the upper thread T that has passed through the thread trapping part 103 is sewn into the needle stitch S of the cloth back side. , The loop W passing through the thread catching part 103 (different from the upper thread loop TL provided to form the needle stitch S) is formed (FIG. 28).

 The loop W is separated from the thread catching part 103 even when the upper thread T is released by separating the first fitting part 104 and the second fitting part 106 from each other. Since the fabric is entangled with the thread capturing section 103, the number of needles is increased, that is, the fabric C is transferred as the sewing progresses, so that the fabric C is pulled or the fabric C is pulled. , Misalignment of fabric (separation of sewing shape), cutting of thread, malfunction of device, and the like.

In the conventional thread clamping device 101, the "length of thread end" of the upper thread T is longer than the distance from the fitting portion of the upper thread T to the needle dropping point DP of the cloth C. In this case, since the upper thread loop TL passes repeatedly as the time (the number of needles) which is clamped increases, the thread end TA is pulled up and the frequency which it inserts and sews becomes high.

Therefore, there is a demand for an upper thread clamping device capable of avoiding the formation of a loop through which the front end side of the threaded end of the upper thread being held is sewn into the needle stitches on the back side of the fabric and passing through the thread trapping portion.

An object of the present invention is to avoid the formation of a loop through which the front end side of the upper thread end being fitted is sewn into the stitches of the fabric backside and passes through the thread trapping portion.

A feature of the upper thread clamping device of the sewing machine of the present invention is that the upper thread clamping means for capturing and threading the threaded end of the upper thread, and the driving means for driving the upper thread clamping means, start sewing At the same time, the thread end of the upper thread inserted into the thread passage hole of the sewing needle is caught and held below the needle plate of the bed portion and at a position spaced apart from the shanghai path of the sewing needle, An upper thread clamping device of a sewing machine configured to release a threaded end of the upper thread to which the upper thread is held after dropping a needle, wherein the upper thread clamping means is supported when the upper thread clamping means catches and threades the upper thread of the upper thread. Pulling path of the upper thread loop to the part of the threaded part which falls down from the fitting end of the threaded end by means. The thread removal means for removing the yarn so as to be spaced apart from the point that is formed. By adopting such a configuration, the thread removing means includes an end portion of the thread which is lowered from the threaded portion of the threaded end by the threaded threaded support means when the threaded threaded means catches and threaded the threaded end of the upper thread. Since the part can be detached from the pulling path of the upper thread loop, it is possible to avoid the formation of a loop through which the front end side of the threaded end of the upper thread that is being fitted is sewn into the needle stitches on the back side of the fabric and passes through the thread trapping part.

In addition, the upper thread clamping device of the sewing machine of the present invention according to claim 2, characterized in that, in the upper thread fitting means, the thread through hole of the sewing needle passing through the needle hole of the needle plate passes through the inside. And a thread capturing portion formed in a frame shape, wherein the thread removing means is movable along a horizontal plane and pressurized and held so as to be spaced apart from the thread capturing portion by pressing means. And a seal removal operation member which is in contact with and spaced apart from the seal removal main body and is formed to operate the seal removal main body to remove the seal by bringing the seal removal operation member into contact with the seal removal main body. have. By adopting such a configuration, the upper thread can be captured and the thread removing operation can be surely executed by a simple operation of bringing the thread removing operating member into contact with the thread removing main body.

In addition, the upper thread clamping device of the sewing machine of the present invention according to claim 3, characterized in that, the upper thread clamping means, the first clamping member having a first clamping portion formed in the thread capture portion; And a second fitting support member having a second fitting support portion for fitting the threaded end portion between the first fitting support portions provided to be relatively in contact with and spaced apart from the first fitting support portion, wherein the driving means is provided. Is an initial position of at least an interior of the seal capturing portion located on the shanghai east route, wherein the first fitting support and the second fitting supporting unit oppose to both sides with the shanghai east route interposed therebetween; The support part and the second fitting support part are spaced apart from the side of the shanghai path, and between the first fitting support part and the second fitting support part. The upper thread fitting means is formed to be capable of driving so as to selectively take two positions with the fitting supporting position for fitting the thread end portion, wherein the thread removing main body is formed in the first fitting supporting member, The seal removing operation member is formed in the driving means, and the seal removal main body is configured to operate in conjunction with an operation when the first fitting support and the second fitting support hold the threaded end of the upper thread. It is at that point. By adopting such a configuration, since the drive source is not individually required to operate the seal removing means, the structure of the seal removing means can be made simple, and it is related to the deviation of the operation of the first fitting member and the precision of the parts. You can certainly remove the thread without.

In addition, the upper thread clamping device of the sewing machine of the present invention according to claim 4, characterized in that, the upper thread clamping means, the first clamping member having a first clamping portion formed in the thread capture portion; And a second fitting member provided with a second fitting support portion which is installed to be relatively in contact with and spaced apart from the first fitting support portion and supports the threaded end portion between the first fitting support portion, and the drive The means may include at least an initial position in which the inside of the seal capturing unit is located on the shanghai east route, and wherein the first fitting support and the second fitting support unit are opposed to both sides with the shanghai east path interposed therebetween, and The first fitting support and the second fitting support are spaced apart to the side of the shanghai path, and between the first fitting support and the second fitting support. The upper thread fitting means is formed to be capable of driving so as to selectively take two positions with the fitting supporting position for fitting the thread end portion, and the thread removing main body is formed in the driving means, and the thread removing is performed. A forging member is formed in the first fitting support member, and the thread removing body is configured to operate in conjunction with an operation when the first fitting support and the second fitting support fit the threaded end of the upper thread. It is in a point. By adopting such a configuration, since the drive source is not individually required to operate the seal removing means, the configuration of the seal removing means can be simplified, and it is related to the deviation of the operation of the first fitting member and the precision of the parts. You can certainly remove the thread without. In addition, even if the upper thread is thick, stable thread removal can be reliably performed.

According to the upper thread clamping device of the sewing machine according to the present invention, when the upper thread fitting means catches and threades the threaded end of the upper thread, the thread removing means falls down from the fitting portion of the upper thread by the upper thread fitting means. Since the part of the threaded end of the upper thread can be removed from the lifting mirror of the upper thread loop, the threaded end of the threaded upper thread can be prevented from entering the upper thread loop. As a result, the front end side of the threaded end portion of the upper thread to be fitted is sewn into the stitches of the fabric back side, and thus an excellent effect can be avoided from forming a loop passing through the thread trapping portion.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated according to embodiment shown to drawing.

For convenience of explanation, the sewing machine provided with the upper thread clamping device (hereinafter, simply referred to as the 'thread thread clamping device') of the sewing machine according to the present embodiment will first be described with reference to FIGS. 1 to 3.

1 to 3 show a sewing machine having a upper thread clamping device of the sewing machine according to the present invention.

The sewing machine of this embodiment is provided with the basic structure of the cylinder bed sewing machine set in which the front-end | tip part of a bed part was formed in substantially cylindrical shape, and the width | variety of the X-axis direction mentioned later is narrower than another site | part.

As shown in FIG. 1, the sewing machine 1 of this embodiment is a bed part 2 and the connection trunk | drum part which was formed in the back side and protruded upward as shown to the right side of FIG. (3) and approximately 'co' with an arm portion (4) extending so as to extend in parallel with the bed (2) toward the front as shown on the left side of FIG. 1 from the top of the connecting body (3). 'It is formed in a shape.

Here, for convenience of explanation, the shank east direction of the sewing needle N, which will be described later, is referred to as the Z axis direction, and the direction perpendicular to this is the longitudinal direction of the bed part 2 and the arm part 4 in the Y axis direction. The direction orthogonal to both the Z axis direction and the Y axis direction is referred to as the X axis direction.

In addition, when the sewing machine 1 is installed on the horizontal plane, the + side in the Z-axis direction is set to the upper side and the-side, and the + side in the X-axis direction is set to the left side and the-side to the right side, in the Y-axis direction. The + side of is explained below with the front and-side of the back.

The sewing machine 1 is formed on the front end of the arm portion 4 and is formed on the sewing needle (N) and reciprocating in the vertical direction by the driving force of the sewing machine motor (5), the upper portion of the arm portion (4) An upper thread supply source (not shown) for supplying the upper thread T to the needle N, and the upper thread T is sandwiched between the upper thread supply source and the sewing needle N with a predetermined load and moved in the transfer direction. Thread tensioner 6 for generating a resistance force, and a thread take-up that pulls up the upper thread T by the thread take-up 7 at a predetermined timing between the thread tension control device 6 and the sewing needle N. FIG. A device, a needle plate 8 formed on the upper surface of the bed portion 2 and having a needle hole 8a (FIG. 2) for inserting a leading end portion of the sewing needle N therein, and inside the bed portion 2, the needle It is formed below the plate 8 and shows the upper thread loop TL while hooking the upper thread loop TL from the lowered sewing needle N. When the first needle of the sewing needle N rises between the needle plate 8 and the kiln mechanism 9 with a vertical semi-rotating kiln through which an unthreaded lower thread is inserted. The upper thread clamping device 10 (hereinafter, simply referred to as the upper thread clamping device 10) of the sewing machine for fitting the thread end TA of the upper thread T to the sewing machine, and is formed inside the bed part 2 and sewn It has a thread cutting device (not shown) which cuts the upper thread T and the lower thread later, and control means 11 (FIG. 3) which control the operation | movement of each part.

In the sewing needle N, a thread through hole Na (needle stitch hole: FIG. 2) is formed slightly above the distal end as shown below in FIG. 1, and an upper thread T in the thread through hole Na. ) Is to be inserted. Moreover, the base end shown above the sewing needle N of FIG. 1 is detachably attached to the lower end part of the needle bar 12 via the needle fixing part which is not shown in figure. The needle bar 12 is disposed on the free end side shown in the left side of FIG. 1 of the arm part 4, and the lower end of the needle bar 12 is formed from the lower surface of the free end side of the arm part 4. The needle dropping position, in detail, is provided so as to protrude toward the needle hole 8a of the needle plate 8. In addition, the needle bar 12 is connected to a needle bar drive mechanism (not shown), and the needle bar drive mechanism rotates the needle bar 12 with the sewing needle N attached to the lower end by a driving force of the sewing machine motor 5. In conjunction with the rotation of the main shaft of the sewing machine (not shown) which is driven, it is formed to reciprocate in the vertical direction at a predetermined cycle and with a predetermined stroke.

The sewing machine motor 5 is provided with an encoder 13 (Fig. 3) for detecting the rotational phase angle thereof. When the sewing needle N is located at the top dead center, 0 ° is set. The output shaft of the current sewing machine motor 5 is output to the control means 11 at which angular position of 0 to 360 degrees.

The thread take-up (7) is formed with a guide hole (not shown) through which the upper thread (T) is inserted, and moves up and down in the state where the upper thread (T) is inserted, thereby raising the thread of the sewing needle (N) at its rise. The upper thread T passed through the insertion hole Na is pulled up. The thread take-up device moves the thread take-up 7 at the same cycle as the sewing needle N, but the timing at which the thread take-up 7 is located at the top dead center is that the sewing needle N is located at the top dead center. It is set to be a little later than the viewpoint.

As shown in Fig. 2, the kiln mechanism 9 performs a rocking motion (reciprocating half-turn motion of alternately repeating a half-turn motion in the forward rotation direction and a half-turn motion in the reverse rotation direction) , The middle kiln 16 for capturing the upper thread loop TL by the knife tip 15 protruding along the circumferential direction, and the large kiln 17 for rotatably supporting the middle kiln 16. And the upper thread guide plate 18 formed on the upper part of the large kiln 17 and the connecting trunk 3 in parallel in the longitudinal direction of the bed 2 toward the large kiln 17 from the arrangement side. It has a kiln shaft 19 (only part of which is shown in Fig. 1) which extends and imparts a rocking drive force to the middle kiln 16 through a driver (not shown). The kiln shaft 19 is configured such that the driving force branched from the sewing machine motor 5 is converted into the oscillation driving force and transmitted, and the reciprocating movement of the sewing needle N in the vertical direction and the oscillation movement of the middle kiln 16 are performed. Synchronization is achieved with a predetermined phase difference with respect to. In addition, the upper thread guide plate 18 is in contact with the race surface of the middle kiln 16 of the upper thread T, or the sliding movement surface (the race of the large kiln 17) between the middle kiln 16 and the large kiln 17. It is a plate-shaped member for preventing the invasion of the surface and the contact surface between the race surface of the middle kiln 16).

As shown in Fig. 3, the control means 11 is not shown in detail, but a CPU (which may be an MPU) for performing various arithmetic processes, a ROM for storing and storing various programs for various processes such as control and judgment, It has RAM used as work memory in various processes. In addition, a nonvolatile memory is provided as necessary for rewriting data. The control means 11 includes a thread clamping motor 58 as a driving source of the sewing machine motor 5, the encoder 13, and the driving means 27 to be described later, via a system bus and a driving circuit. The first cutting state motor 66, the first state sensor 66 and the second state sensor 67 of the moving position detecting means 56, which will be described later, the start / stop switch 21 for inputting the start and stop of sewing; An operation panel, a power switch, and the like, which are not shown, are connected.

The control means 11 can recognize the rotation angle of the sewing machine motor 5 on the basis of a pulse signal input from the encoder 13 provided on the output shaft of the sewing machine motor 5.

Further, the control means 11 is based on the detection signal input from the first state sensor 66, the second state sensor 67, the upper thread fitting means 26 to be described later; ), Three positions of the initial position, the clamping position, and the release position can be confirmed.

In addition, when the sewing start signal is input from the start / stop switch 21, the control means 11 according to the rotation angle of the sewing machine motor 5 or the operation position detection of the movement position detecting means 56, The drive of the seal clamping motor 58 as a drive source of the drive means 27 can be controlled.

Next, an embodiment of the upper thread clamping device according to the present invention will be described.

4 to 6 is a view showing an embodiment of the upper thread clamping device according to the invention, Figure 4 is a perspective view of the main part, Figure 5 is an exploded perspective view of the main part of Figure 4, Figure 6 is an enlarged exploded perspective view of the main part of Figure 5 .

In the upper thread clamping device 10 of the present embodiment, the needle stitches S (see Fig. 28) at the start of sewing are reliably formed, that is, the thread end TA of the upper thread T at the start of sewing is the cloth C; In order to prevent it from coming off, the thread end TA of the upper thread T inserted into the sewing needle N of the first needle at the start of sewing is further sewn under the needle plate 8; At the position spaced apart from the shank east path NL (FIG. 2) of the needle N, the needle portion TA of the threaded upper thread T is inserted after the needle number is dropped. To liberate.

As shown in FIG. 4 and FIG. 5, the upper thread clamping apparatus 10 of this embodiment is the 1st fitting which became relatively contactable and spaced apart in order to capture and hold the threaded end TA of the upper thread T. FIG. It has a fitting means 26 which has a support part 24 and a 2nd fitting part 25, and the drive means 27 for driving the said fitting means 26. As shown in FIG. The drive means 27 further includes a moving means 28 and an associated operating means 29. Moreover, the upper thread clamping device 10 of this embodiment has the thread removal means 30. As shown in FIG.

The moving means 28 includes an initial position (Figs. 7 to 10) in which the fitting support 26 is located on the shanghai east path NL of the sewing needle N, and the sewing needle N from this initial position. (NL) is parallel to the Z-axis direction and rearward from the distal position of the sewing needle N at the top dead center to the line unit value of the sewing needle N at the bottom dead center). 13 and 14 spaced apart (connecting body side) and the release position (FIG. 15, 16) spaced further rearward (connecting body side) than the fitting support position. At the same time, it is made to move from the initial position to the clamping position at the start of sewing and stop while the needle of the predetermined number of needles falls, and then move from the clamping position to the release position.

The associated operation means 29, when the fitting means 26 is located in the initial position, the second fitting portion 25 is located at the position closer to the connecting body portion than the shank east path NL of the sewing needle N. At the same time, the first fitting support part 24 is disposed at a position opposite to the fitting support part 31 with the shank east path NL of the sewing needle N interposed therebetween, and the fitting supporting means 26 is positioned at an initial position. When moving to the fitting support position, the first fitting support 24 and the second fitting support 25 are moved in a direction approaching the thread end portion TA of the upper thread T to be fitted, and the fitting support means ( When the 26) is moved to the release position, the first fitting support part is spaced apart from the first fitting support part 24 so as to release the threaded end TA of the upper thread T held by the second fitting support part 25. The 24 and the second fitting portion 25 are mechanically interlocked with the movement of the moving means 28.

That is, the drive means 27 of this embodiment is comprised so that the engagement means 26 can operate so that it can selectively take 3 positions of an initial position, an insertion support position, and a release position.

As the driving means 27, instead of the moving means 28 and the associated operation means 29, the entirety of the fitting means 26 is driven by the driving force of the first actuator so as to provide the initial position, the fitting position and the release position. The first fitting portion 24 and the second fitting portion 25 are configured to move selectively to three positions (sometimes, two positions of the initial position and the fitting position) and the driving force of the second actuator. May be used together with the configuration of relatively contact and spaced operation.

The thread removing means 30, at least when the fitting means 26 is moved to the fitting position to capture the upper thread (T) to be fitted, the upper thread (T) by the fitting means 26 is supported It is for removing the thread so that the threaded end TA of the upper thread T draped downward from the part is spaced apart from the pulling path of the upper thread loop TL, and mechanically interlocked with the operation of the fitting means 26. have.

As shown in FIG. 4 and FIG. 5, the fitting means 26 of the present embodiment includes a first fitting member 31 having a first fitting support 24, and a second fitting support 25. It has the 2nd clamping member 32 provided. Each of these members 31 and 32 has a long plate shape in its entire shape, and they are stacked with the second fitting member 32 facing up, and both of them are directed in parallel to the Y-axis direction. Both sides are supported by the associated operating means 29 so as to be slidably moved along the Y axis direction (front and rear direction) in the state.

Hereinafter, in the description of each part of the fitting means 26, when a term indicating a direction is used, unless otherwise specified, the fitting means 26 is supported by the associated operating means 29. It is assumed that the direction is indicated.

As shown in FIG. 5 and FIG. 6, the first capturing member 31 is provided with a thread capturing portion 33 at the tip portion located at the + side in the Y-axis direction. In the present embodiment, the thread capturing section 33 has a frame shape through which the thread passage hole Na of the sewing needle N, which has passed through the needle hole Pa of the needle plate P, can pass through. The plane is formed in a long rectangular shape along the front-rear direction. And the 1st clamping part 24 used when clamping the upper thread T is formed by the front inner surface located in the Y-axis direction + side among the inner surfaces of the thread capture part 33. As shown in FIG. That is, the first clamping portion 24 forms a part of the thread trapping portion 33. Further, on the distal end side of the outer surface located on the -axis side in the X-axis direction of the first fitting member 31, a thread removing main body 83 having a substantially rectangular shape in the plane of the thread removing means 30 described later is attached. The attachment plate portion 34 for the seal removal main body extends so as to protrude toward the -axis in the X-axis direction, and a screw hole 35 penetrating in the vertical direction is formed in the substantially central portion thereof. Further, the stopper 36 extends downward toward the Z-axis direction-side on the rear end side of the outer surface positioned on the X-axis direction-side of the seal removal main assembly attachment plate 34 located on the X-axis direction-side. have.

The two inner surfaces located on both sides of the X-axis direction of the yarn trapping portion 33 of the present embodiment are guide guides for guiding the movement in the front-back direction of the second sandwiching portion 25 of the second sandwiching member 32. It is also formed to function as.

In addition, as the shape of the thread capture | acquisition part 33, as needed, such as a design concept, a plane may be made into shapes other than a rectangular shape, for example, the Y-axis direction-side may be made into substantially circular arc shape or semi-circle shape, and especially of this embodiment The plane is not limited to the rectangular shape.

As shown in Fig. 5 and Fig. 6, a rectangular through hole 43 having a long plane along the front and rear direction is formed at the rear end located on the Y-axis direction-side of the first fitting member 31. As shown in Figs. In the through hole 43, as shown in Fig. 5, a tension spring 44 of the associated operation means 29, which will be described later, is disposed to form an operation region for stretching. One end of the tension spring 44 is connected to the front end of the through hole 43. In addition, a bracket portion 45 extending toward the X-axis direction is formed at a position slightly behind the Y-axis intermediate portion of the first fitting member 31, and a round bar extending downward toward the tip portion thereof. (Iii)) The engaging pin 46 of the shape is fixed with the tip facing downward. In addition, the first fitting member 31 is formed such that the moving force in the front-rear direction by the associated operation means 29 is input through the engaging pin 46.

As shown in FIG. 5, the second fitting member 32 is divided into two parts, the front part 48 and the rear part 49, and are integrally roughly formed by being connected by the connecting member 50. It is formed in long plate shape. And the 2nd clamping part 25 is formed in the front end part of the front side part 48, The said 2nd clamping part 25 is the 1st clamping part which comprises a part of thread capture part 33 ( The tip of the first fitting support member 31 passes through the fitting surface 25a which can be contacted and spaced apart from the 24) and the lower side of the first fitting support 24 during contact with the first fitting support 24. It has the curved part 25b which protrudes ahead of a surface.

Accordingly, the upper thread T inserted through the thread catching portion 33 of the first fitting member 31 from above by the relative approach operation of the first fitting member 31 and the second fitting member 32. ) Is formed to be fitted by the fitting surface 25a of the first fitting support 24 and the second fitting support 25. Moreover, the upper thread T which was fitted is bent toward the front by the bent part 25b extended toward the front from the lower end part of the fitting surface 25a, and let the upper thread T bend from the front side downward. It is supposed to be. As a result, since the threaded end TA of the upper thread T is hung downward by the bent part 25b in the state located further forward, the middle kiln 16 of the kiln mechanism 9 located below it is lowered. The position is shifted more forward, and is formed to prevent the middle kiln 16 from being touched or rolled up.

Moreover, as the clamping surface 25a of the 1st clamping part 24 and the 2nd clamping part 25, the clamping surface 25a of the 1st clamping part 24 and the 2nd clamping part 25 is the upper thread. You may form the shape which can be contacted through (T), for example, the plane in curvature like an arc shape.

In the rear side 49, a through hole 51 is formed along the front and rear directions, and the second fitting support member 32 and the first fitting support member 31 are superimposed on the associated operation means 29. In the case of being supported, the through hole 51 is polymerized with the through hole 43 of the first fitting member 31 described above, and the tension spring 44 of the associated operation means 29 is disposed inside thereof. In addition, the operation region is formed to perform the expansion and contraction. The other end of the tension spring 44 is connected to the rear end of the through hole 51.

Accordingly, the second fitting member 32 is connected to the first fitting member 31 through the tension spring 44, and the first fitting member 24 and the first fitting member 24 of the first fitting member 31 are formed. The 2nd clamping part 25 of the 2nd clamping member 32 is always provided with a pressing force in the direction which approaches and abuts each other.

A middle portion of the rear side 49 of the second fitting member 32 in the Y-axis direction is provided with a bracket portion 52 extending toward the X-axis direction, and the tip portion extends downward. A round bar-shaped engaging pin 53 is fixed to the front end thereof downward. In addition, the second fitting member 32 is configured to input a moving force in the front-rear direction by the associated operating means 29 through the engaging pin 53.

The moving means 28 is, for the first fitting portion 24 and the second fitting portion 25 of the fitting means 26, before the start of sewing of the shank east path NL of the sewing needle N in advance. After the start of sewing and when the sewing needle N of the first needle is removed from the fabric, the clamping position becomes rearward from the initial position with respect to the shank east path NL of the sewing needle N. Three positions of moving the needle to the release position that is later than the fitted position with respect to the shank east route NL of the sewing needle N when the needle falls a predetermined number of times (for example, 2-3 needles). Is to go for.

To this end, the moving means 28 includes a Y-axis moving mechanism 55 for reciprocatingly driving the fitting means 26 supported by the associated operation means 29 along the Y-axis direction, and the fitting means 26. The Y-axis moving mechanism 55 based on the detection of the movement position detecting means 56 (Fig. 9) and the movement position detecting means 56 for detecting whether the position is at the initial position, the clamping position, or the release position. And moving positioning control means for controlling the operation of the < RTI ID = 0.0 >

As shown in Fig. 5, the Y-axis moving mechanism 55 itself is provided on the output shaft of the seal clamping motor 58 and the seal clamping motor 58 which output the rotational driving force as a drive source of the drive means 27. The main link body 59 to which the pivot center position of the main body is connected, the driven link body 61 for imparting the movement force in the Y-axis direction to the relative position adjusting link body 60 of the associated operation means 29, and the main link body The transmission link body 62 which transmits a driving force from the 59 to the driven link body 61 is provided.

As the seal clamping motor 58, for example, a stepping motor is used, and is driven at an arbitrary rotation angle with respect to the forward and reverse directions by the operation control of the control means 11.

One end of the main link body 59 is fixedly connected to the output shaft of the seal clamping motor 58, and the other end thereof is rotatably connected to one end of the transmission link body 62.

One end of the driven link member 61 is axially supported by a guide plate 63 to be described later of the associated operation means 29, and the other end thereof is rotatably connected to the other end of the transmission link member 62. have. In addition, a substantially engaging " shaped " driven link member 61 is provided with a engaging projection 64 for imparting a moving force in the Y-axis direction to the relative position adjusting link member 60 of the associated operation means 29. It is.

The transmission link member 62 is provided to substantially follow the Y-axis direction, and swings the driven link member 61 together with the oscillation of the main link member 59 by the drive of the seal clamping motor 58. Formed.

With this configuration, when the seal clamping motor 58 is driven, the driven link member 61 swings together with the swing of the main link member 59, and the associated operating means 29 is connected via the engaging projection 64. The relative position adjusting link member 60 is formed to move along the Y axis direction.

The moving position detecting means 56 has a light emitting element and a light receiving element, first and second state sensors 66 and 67 for detecting the presence or absence of a shield between them, and the aforementioned Y axis moving mechanism 55. And a shielding plate 70 formed on the transmission link member 62 and having first and second shielding regions 68 and 69 (FIG. 9).

The first and second state sensors 66 and 67 are arranged side by side along the moving line of the shielding plate 70, and the first state sensor 66 is disposed at the rear side. Accordingly, the state sensors 66 and 67 are in a state arranged side by side substantially along the Y axis direction. The light receiving elements of the respective state sensors 66 and 67 turn the state with the shield ON and the state without the shield with the OFF state, so as to output a signal for identifying each state to the control means 11. It is.

On the other hand, the shielding plate 70 is fixedly supported by the transmission link member 62 so as to pass between the light emitting element and the light receiving element with respect to both of the first and second state sensors 66 and 67. The first shielding region 68 is located between the first state sensor 66 and the second state sensor 67 when the fitting means 26 is in the initial position, and the first shielding region 68 is positioned when the fitting means 26 is in the initial position. The Y-axis position and the Y-axis direction length are set so that it is in the position which shields the 1 state sensor 66, and is still in the position which shields the 1st state sensor 66 when it is in a release position.

The second shielding area 69 is located in front of the second state sensor 67 in any case when the fitting means 26 is in the initial position or the fitting support position, and only when the second shielding area 69 is in the release position. The Y-axis direction position is set so that it may become the position which shields the sensor 67. FIG.

Therefore, in the control means 11, it can be discriminated from the fact that both the 1st and 2nd state sensors 66 and 67 are in the OFF state that the fitting means 26 is in an initial position, and the fitting means 26 ) Can be discriminated from the fact that the first state sensor is in the ON state and the second state sensor 67 is in the OFF state, and that the fitting means 26 is in the released position. And the second state sensors 66 and 67 can be discriminated from being in the ON state.

The movement positioning control means is actually realized by the control of the control means 11. In this way, the movement positioning control means may be realized by borrowing a part of the function of the control means 11 for controlling the operation of the entire sewing machine, or may be realized by an independent control means.

The control means 11 as the movement positioning control means is a position in which the rotation angle of the seal clamping motor 58 for moving the clamping means 26 from the initial position to the clamping position and the release position from the clamping position. The amount of rotation angle to be moved to is stored. When the fitting means 26 is positioned at the second and release positions, the operation of the seal clamping motor 58 is controlled with reference to the storage angle position.

For the initial position, the control means 11 performs control (initializing operation processing) as the initial position control part by using the movement position detecting means 56 when the sewing machine 1 is powered on, and for thread clamping. The motor 58 is driven to search for a position where both the first and second state sensors 66 and 67 are turned off and wait at that position.

In addition, when the first needle after the start of sewing, the encoder 13 of the sewing machine motor 5 detects that the output shaft angle is 245 °, for example, it recognizes that the sewing needle N has fallen upward from the cloth C. Control as the upper thread holding control part for positioning the fitting means 26 in the fitting position is performed.

In the sewing machine 1 of the present embodiment, when the top dead center position of the sewing needle N is set to 0 ° with respect to the output shaft of the sewing machine motor 5, the sewing needle N is lowered when it rotates to 245 °. It is set to pass through the point and to be pulled out above the needle plate 8. Further, by the output of the encoder 13, when a predetermined number of needle drops after the start of sewing is detected, the control as the upper thread release control unit for positioning the fitting means 26 at the release position is performed. Here, the recognition of the number of needles by the output of the encoder 13 is achieved by counting the number of signal outputs indicating 180 degrees by the encoder 13, for example.

As shown in Fig. 5, the associated operation means 29 includes a guide plate as a guide means for supporting the second fitting member 32 and the first fitting member 31 in a reciprocating manner along the Y-axis direction, respectively ( 63) and the tension between the second fitting member 32 and the first fitting member 31 is always applied in the direction in which the second fitting member 25 and the first fitting member 24 approach each other. The second spring-supporting member 32 can be brought into contact with and spaced apart from the tension spring 44 as the tension-pressing means and the second spring-supporting portion 25 and the first spring-supporting portion 24 in accordance with a change in posture caused by its own swing. Relative position control linkage 60 is engaged with each of the first and the first supporting member 31, and at the same time the movement force for each moving position of the fitting means 26 by the moving means 28 is input. And when the fitting means 26 is in the initial position, the second position is brought into contact with the relative position adjusting link member 60. The relative position adjusting link member 60 when the first contact member 72 swings in the direction away from the claw 25 and the first clamped portion 24 and the clamping means 26 is in the released position. ) And a second contact member 73 which swings in the direction of separating the second fitting support 25 and the first fitting support 24 from each other.

The guide plate 63 is upper part of the bed portion 2 and fixed to the rear of the needle plate 8.

Hereinafter, in the case where the term indicating the direction is used in the description of each part of the associated operation means 29, unless otherwise indicated, the direction in the state where the guide plate 63 is fixed to the bed part 2 is shown. It shall be present.

On the upper surface of the guide plate 63, a guide groove 75 along the Y-axis direction is formed at an intermediate position in the X-axis direction. In the guide groove 75, the first fitting member 31 and the second fitting member 32 of the fitting means 26 are accommodated in an overlapped state in a longitudinal direction, and the pressing plate therefrom. The lid 76 is covered so that the first fitting member 31 and the second fitting member 32 do not fall out of the guide groove 75. Accordingly, the first fitting support member 31 and the second fitting support member 32 are guided to the guide grooves 75 so as to slide along the Y axis direction, respectively.

However, as described above, since the first fitting member 31 and the second fitting member 32 are connected via the tension spring 44, unless the external force is applied, each member 31, 32 The first fitting support part 24 and the second fitting support part 25 are kept in contact with each other.

Through-holes 77 and 78 are formed at both sides with guide grooves 75 of the guide plate 63 interposed therebetween. The engaging pin 46 formed in the first fitting member 31 is inserted into the one through hole 77 from above, and the second fitting member 32 is inserted into the other through hole 78. The engaging pin 53 is inserted. In addition, each of the through-hole yoke 77, 78 is a movement from the initial position of the fitting means 26 to the release position and thus the first fitting member 31 and the second fitting member 32. In the relative movement, the length in the Y-axis direction is set so that neither the front end nor the rear end of each of the holes 77 and 78 comes into contact with each of the engaging pins 46 and 53. Further, the respective engaging pins 46 and 53 inserted through the through holes 77 and 78 are slightly protruded from the lower surface side of the guide plate 63, so that the relative positioning link bodies 60 are individually. Is engaged in

The relative position adjustment link member 60 is arranged in parallel with the longitudinal direction thereof, and rotates between the locking engagement portion 79 with the first fitting member 31 and the second fitting member 32. The rotation engaging portion 81 between the engaging portion 80 and the moving means 28 positioned therebetween is formed.

That is, the rotation engaging portion 79 with the first fitting member 31 is a long hole-shaped through hole in the longitudinal direction of the relative positioning link member 60, and the engaging pin 46 passes through the insertion portion. It is. The rotation engaging portion 80 with the second fitting member 32 is a circular through hole, and the engaging pin 53 is inserted through. The rotation engaging portion 81 with the moving means 28 is a long hole-shaped through hole in the longitudinal direction of the relative position adjusting link member 60, and the engaging projection 64 is inserted therethrough.

As shown in FIG. 6, the seal removing means 30 has a seal removing main body 83 and a seal removing operating member 84 for operating the seal removing main body 83.

The thread removal main body 83 faces the X-axis direction-side from the rear end which is located in the Y-axis direction-side of the plate-shaped thread removal arm 85 which is elongate in the front-back direction, and the said thread removal arm 85. It is formed in the bell crank shape as a whole by the plate-shaped input arm 86 extended at substantially right angle. Moreover, the claw part 85a extended toward the X-axis direction + side is formed in the front-end | tip part of the thread removal arm 85, and is formed so that it may become a hook shape as a whole. And the thread capture | acquisition by the thread removal main body 83 is carried out to the base part of the claw part 85a which is the connection part of each side surface located in the X-axis direction + side of the claw part 85a and the thread removal arm 85. FIG. The recessed part 85b as a part is formed. In addition, an insertion through hole 87 penetrating in the vertical direction is formed in the connection portion between the seal removal arm 85 and the input arm 86, and the seal removal main body 83 is formed in the insertion hole 87. ), An attaching stepped screw 88 that functions as a support pin for supporting the) is inserted from below.

The mounting step screw 88 is screwed to the threaded hole 35 of the mounting plate portion 34 for thread removal main body, and the thread removal main body 83 is centered on the mounting step screw 88 for mounting. The rotation is possible. A torsion coil spring 89 as an urging means is attached to the mounting step screw 88. The torsion coil spring 89 is disposed on the lower surface side of the seal removal main body 83, and one end thereof is located on the Y-axis direction-side of the stopper 36 formed on the attachment plate portion 34 for the seal removal main body. It is caught by the cross section, and the other end is caught by the front surface located in the + -axis direction + side of the drive arm of the thread removal main body 83 (FIG. 10).

As for the said thread removal main body 83, the rear end surface always located in the Y-axis direction-side of the input arm 86 abuts on the stopper 36 by the pressing force (spring force) of the torsion coil spring 89, , The maximum rotational position in the counterclockwise direction is regulated when viewed from above in the Z-axis direction + side, and the seal removal arm 85 is centered around the mounting stepped screw 88, and clockwise along the horizontal plane when viewed from above (Fig. 10 counterclockwise). In this state, the thread removal arm 85 is disposed substantially parallel to the thread trapping portion 33 on the side located on the X-axis direction − side of the thread trapping portion 33, and the thread trapping portion ( 33) to maintain the position away from. Moreover, the claw part 85a of the thread removal arm 85 is arrange | positioned from the front-end | tip of the thread capture | acquisition part 33 to the Y-axis direction + side, and the thread removal main body 83 attaches the stepped screw 88 for attachment. When it rotates clockwise as viewed from the center, the thread removal arm 85 is comprised so that it may cross immediately below the thread capture | acquisition part 33. As shown in FIG.

The seal removing operation member 84 is formed in a rod shape protruding from the central portion of the tip end face positioned on the + axis direction + side of the guide plate 63 to the Y axis direction + side near the X axis direction − side. . Further, the distal end of the thread removal operating member 84 is opposed to a portion at the distal end side located on the X-axis direction-side of the side located on the Y-axis direction-side of the input arm 86 of the thread removal main body 83. It is arrange | positioned at the position to say. Of course, the seal removal operation member 84 is arrange | positioned in the position which does not interfere with the stopper 36. As shown in FIG.

In addition, the seal removal operation member 84 is not limited to the guide plate 63, You may arrange | position it to other fixed parts, such as the bed part 2 and the like.

In addition, the seal removal operation member 84 has its tip in contact with the input arm 86 to start the rotation of the seal removal main body 83 while the fitting means 26 reaches the fitting support position from the initial position. When the clamping means 26 reaches the release position beyond the clamping position, the rotation of the thread removing main body 83 is completed. As the rotation angle for rotating the thread removal main body 83, a thread of the upper thread T draped downward from the fitting portion of the upper thread T by the first fitting part 24 and the second fitting part 25. It is comprised so that the edge part TA may be made into the angle which can be spaced apart from the pulling path of the upper thread loop TL.

Therefore, the seal removal operation | movement member 84 may be set as the structure which can adjust the position of the front end of the + -axis direction + side along a Y-axis direction. For example, a screw portion is formed at the base end of the seal removing operation member 84, and the screw insertion amount is changed when the screw portion is screwed into the screw hole formed in the guide plate 63 or another fixed portion. Can be mentioned. With such a configuration, the precision of the parts can be reduced and the cost can be reduced, and the rotation timing and the opening angle of the thread removing main body 83 can be adjusted in detail, and the fineness and the strength of the upper thread T can be set in detail. This can prevent thread cutting and further improve the quality of the finished product.

Other configurations are formed in the same manner as a sewing machine having a conventional upper thread clamping device, and thus detailed description thereof will be omitted.

Next, the operation of the present embodiment having the above-described configuration will be described.

7-16 is explanatory drawing explaining the operation | movement in embodiment of the upper thread clamping device which concerns on this invention. 7-16, only the principal part is attached | subjected.

As shown in FIGS. 7-10, when the power switch of the sewing machine 1 of this embodiment is operated ON, the control means 11 performs an initialization operation and positions the fitting means 26 to an initial position. Decide Therefore, the fitting support 26 is located on the shanghai east path NL of the sewing needle N, and the first fitting support 24 is located in front of the shanghai east path NL of the sewing needle N. And, the second fitting portion 25 is located behind the straight line (M). In the state where the fitting means 26 is positioned at the initial position, the thread removing means 30 has a Y-axis from the input arm 86 of the thread removing operation member 84 at the tip of the thread removing operation member 84. The thread removal arm 85 abuts on the stopper 36 by the pressing force of the torsion coil spring 89, spaced apart in the direction-side. Thereby, the thread removal arm 85 is positioned in the longitudinal direction toward the front-back direction, and in the side where the thread removal arm 85 is located in the X-axis direction-side of the thread capture | acquisition part 33, It is arrange | positioned substantially parallel with respect to the thread capture | acquisition part, and the thread removal main body 83 hold | maintains the position spaced apart from the yarn capture part 33. As shown in FIG. Further, it is determined that the fitting means 26 is positioned at the initial position by the control means 11 receiving the OFF signals from the first and second state sensors 66 and 67.

Subsequently, the control means 11 detects the initial position by the movement position detecting means 56 when receiving the sewing start signal from the start / stop switch 21. When it is detected that both the signals from the first and second state sensors 66 and 67 are in the OFF state, the drive of the sewing machine motor 5 is started. Thereby, the sewing needle N penetrates through the needle hole 8a of the needle plate 8, and also inside the thread catching portion 33 which is in a closed state, the first fitting portion 24 and the second fitting portion. The upper thread T passes through the spaces 25. Moreover, below it, the upper thread loop TL of the sewing needle N is caught by the knife tip 15 of the kiln mechanism 9 which drives. Then, the upper thread loop TL is enlarged by the rotation of the middle kiln 16 and the upper thread guide plate 18. At this time, since the distal end portion of the second fitting support 25 is sufficiently positioned rearward, the upper thread guide plate ( 18) expansion of the upper thread loop TL is not prevented. Therefore, contact of the upper thread T with the race surface 22 of the middle kiln 16 located behind is prevented. At this time, the thread removal main body 83 maintains the position spaced apart from the thread trapping part 33.

  Subsequently, from the encoder 13 of the sewing machine motor 5, the needle N of the first needle emerges from the cloth C, and it is detected whether the thread take-up 7 has reached the top dead center. Judging from the angle, when the output of the encoder 13 indicates that the thread take-up 7 has reached the top dead center, the control means 11 is not fitted to the thread clamping motor 58 of the moving means 28. The operation of starting the drive is controlled to move the fitting means 26 to the position. That is, the thread clamping motor 58 is driven accordingly with reference to the storage of the rotation angle amount corresponding to the movement amount from the preset initial position to the clamping position.

Accordingly, the fitting means 26 starts moving from the initial position toward the fitting support position. At this time, since the relative position adjusting link body 60 of the associated operation means 29 starts swinging along the X-axis direction by the pressing force of the tension spring 44, the first fitting portion 24 moves backward. And, the second fitting portion 25 moves forward.

After the thread taker 7 reaches the top dead center, the thread end portion TA of the upper thread T is clamped by the first clamping part 24 and the second clamping part 25. The upper thread T, which is lower than the needle hole 8a, is in the shortest state because the pulling up of the thread take-up 7 to the upper thread T is completed at the top dead center of When the upper thread T is clamped by the fitting support 24 and the second fitting support 25, the length of the thread end, which is the length of the upper thread T from the fitted portion to the end, can be shortest. Because there is.

Next, as shown in FIG. 11 and FIG. 12, the 1st clamping part 24 moves to the rear in the middle of the clamping means 26 moving from an initial position toward a clamping position, and the thread removal means 30 is carried out. The tip of the thread removal operating member 84 of the ()) abuts on the side located at the Y-axis direction-side of the input arm 86 of the thread removal main body 83. Further, since the input arm 86 is pressed by the thread removing operation member 84 by further moving backward toward the fitting position of the first fitting portion 24, the thread removing main body 83 is a torsion coil spring ( Against the pressing force of 89, the counterclockwise direction (clockwise when viewed from the top) of FIG. 12, that is, the front end side of the thread removal arm 85, moves the thread catching portion 33 to the center. Initiate rotation along the horizontal plane to face. Therefore, the thread removal main body 83 operates in association with the operation | movement at which the 1st clamping part 24 and the 2nd clamping part 25 clamp the upper thread T. FIG.

Subsequently, when the thread clamping motor 58 is driven and stopped by a predetermined rotation angle amount, as shown in Figs. 13 and 14, the fitting means 26 reaches the fitting support position and at the same time, the first fitting portion is supported. 24 moves to the rear, and the second clamping portion 25 moves forward to approach each other and at the same time the fitting surface 25a of the first clamping portion 24 and the second clamping portion 25 abuts. All. As a result, the thread end portion TA of the upper thread T, which has been inserted between them, is fitted. Further, in practice, the fitting surface 25a of the first fitting portion 24 and the second fitting portion 25 abuts on the way of the fitting means 26 reaching the fitting position. In addition, the clamping means 26 has reached the clamping position and is positioned so that the control means 11 receives the ON signal of the first state sensor 66 and the OFF signal from the second state sensor 67. do. In addition, the movement to the fitting support position is completed while the needle tip of the sewing needle N is above the needle plate 8.

At this time, the thread removing means 30 is rotated so that the front end side of the thread removing arm 85 faces the thread trapping portion 33 with the attaching stepped screw 88 as the center, as shown in FIG. The thread removal arm 85 has a track crossing the threaded portion V of the upper thread T by the first fitting portion 24 and the second fitting portion 25 and the thread path V connecting the kiln K. Take In addition, since the claw portion 85a of the thread removing main body 83 passes through the shank east path NL of the sewing needle N, it does not interfere with the sewing needle N.

As a result, the thread removing means 30 has the thread end portion TA of the upper thread T draped downward from the sandwiching portion of the upper thread T by the fitting means 26. Directly below, the thread is captured by the recessed portion 85b of the thread removal arm 85, and the thread is removed from the X-axis direction + side and the Y-axis direction-side. By removing the thread, a thread end portion which is a portion passing through the thread trapping portion 33 of the upper thread T held between the first fitting portion 24 and the second fitting portion 25 at the first needle ( In the TA, the threaded end TA draped downward from the thread removing main body 83 moves to be spaced apart from the pulling path of the upper thread loop TL of the second needle. This thread removal is to move the thread end TA located below the thread removal main body 83 so as to be spaced apart from the middle kiln 16 so as not to be caught by the passage of the knife tip 15 of the middle kiln 16. You may also

In addition, since the thread end portion TA of the upper thread T is moved from the + -axis side to the Y-axis direction by the thread removing means 30, the upper thread loop TL of the second needle, for example. Even if it is pulled up, the tip Ta side of the threaded end TA of the upper thread T is not sewn into the needle stitch S on the back side of the fabric.

Subsequently, the control means 11 stores the rotation angle amount in accordance with the movement amount from the preset clamping position to the release position, when the needle drop of the preset number of needles (for example, two needle drops) is made. Reference is made to drive the seal clamping motor 58 accordingly.

Accordingly, the fitting means 26 starts moving from the fitting support position toward the release position. Then, while the fitting means 26 approaches the release position, the sliding contact portion 60a of the relative position adjusting link member 60 of the associated operation means 29 makes sliding contact with the second contact member 73. And, if the movement of the fitting means 26 is further continued, the relative position control linkage 60 is oscillated against the pressing force of the tension spring 44, the second fitting portion 25 is the first fitting portion ( Go backwards greater than 24). Therefore, the fitting state of the threaded end TA of the upper thread T is released, so that the threaded end TA of the upper thread T is released from the fitting support means 26, and the fitting support means 26 is in the released position. To reach. In addition, it is detected that the control means 11 receives the ON signals from the first and second state sensors 66 and 67, respectively, when the fitting means 26 reaches the release position and is positioned.

When the fitting means 26 reaches the release position, as shown in Figs. 15 and 16, the thread removing means 30 is formed of the thread removing arm 85 around the mounting stepped screw 88. The tip end side is further rotated so as to face the thread catching part 33, and the thread end part TA of the upper thread T, which is lowered down from the fitting part of the upper thread T by the fitting means 26, is captured. Just below the part 33, it hangs to the recessed part 85b of the thread removal arm 85, and further removes a thread from the X-axis direction + side and a Y-axis direction-side, and completes thread removal (sewing needle ( N) further away from the Shanghai East Route (NL)).

In the upper thread clamping device 10 of the present embodiment, the seal removing means 30 is operated between the initial position of the clamping means 26 and the intermediate position between the clamping position and the release position. However, these are because the upper thread (T) in the fitting support position is prioritized to be firmly supported without being violently moved, and the range where the upper thread (T) is not disturbed, for example, the initial position and the fitting support position. It may be formed so as to complete the operation of the thread removing means 30 from the midway position to the clamping position.

In addition, as a fitting position, the 1st clamping part 24 and the 2nd clamping part 25 are spaced apart to the side of the shanghai east route NL, ie, the 1st clamping part 24 and the 2nd clamping part 25 ) May be a position that does not interfere with the sewing needle N from the shank east path NL of the sewing needle N. FIG.

In addition, the threaded end TA of the upper thread T may be clamped while moving from the initial position to the clamping position.

When the fitting means 26 is moved to a release position and positioned, the first fitting support part 24 and the second fitting support part may be spaced apart by a distance to release the upper thread T.

In addition, as for the release position, the 1st clamping part 24 and the 2nd clamping part 25 may be a position which does not interfere with the sewing needle N from the shanghai-dong path NL of the sewing needle N, It is set behind the clamping position so as not to interfere with other instruments required for sewing.

In addition, as the upper thread clamping device 10, both the threading end TA of the upper thread T is released and released at the same position as the clamping position, that is, the clamping position, without providing the release position individually. You may comprise so that.

As described above, according to the upper thread clamping device 10 of the present embodiment, when the fitting means 26 catches and holds the upper thread T, the upper thread T is held by the fitting means 26. Since the thread removal means 30 for removing the thread is formed so as to space the thread end portion TA of the upper thread T, which is dropped down from the portion, from the lifting path of the upper thread loop TL, The tip Ta side of the threaded end TA of the upper thread T can be reliably and easily avoided from being sewn into the needle stitches S on the back of the fabric to form a loop W passing through the thread catching portion 33. There is a number.

Therefore, according to the upper thread clamping device 10 of the present embodiment, it is possible to easily and reliably prevent shifts in cloth, thread cutting, and malfunction of the device, and ensure high sewing quality. .

In addition, according to the upper thread clamping device 10 of the present embodiment, the sewing condition in which the "insertion passage length", which is the length from the thread passage hole Na of the upper thread T to the tip Ta at the start of sewing, changes. Also, since the thread clamping device 10 can be used, the secondary effect of improving the quality of the finished product and speeding up the productivity (productivity) at the start of sewing can be maintained and implemented.

In addition, according to the upper thread clamping device 10 of the present embodiment, since the thread clamping device 10 can be used irrespective of the "insertion through length", the adjustment of the thread catching spring affecting the "insertion through length" and As a result, there is no side effect of improving productivity since the thread guide (gauge) parts need not be replaced.

Further, according to the upper thread clamping device 10 of the present embodiment, the thread removing means 30 is movable along the horizontal plane, and the thread catching means of the clamping means 26 is clamped by the torsion coil spring 89 as the pressing means. The seal removal main body 83 is pressed and held so as to be spaced apart from the portion 33, and the seal removal operation member 84 in contact with and spaced apart from the seal removal main body 83, By contacting the thread removing main body 83, the thread removing main body 83 is formed to operate to remove the yarn. Therefore, in the simple operation of bringing the thread removing operating member 84 into contact with the thread removing main body 83, As a result, the upper thread T can be captured to more reliably execute the thread removing operation.

Further, according to the upper thread clamping device 10 of the present embodiment, the seal removing main body 83 is formed in the first fitting member 31, and the seal removing operating member 84 is formed in the driving means 27. Since the thread removal main body 83 is formed to operate in conjunction with the operation when the first fitting support 24 and the second fitting support 25 are fitted with the upper thread T, the thread removal is performed. Since the drive source is not required to operate the means 30 individually, the configuration of the seal removing means 30 can be made simple, and irrespective of the deviation of the operation of the first fitting member 31 or the precision of the parts. The thread can be removed reliably.

Further, according to the upper thread clamping device 10 of the present embodiment, the seal removing main body 83 is formed in the first fitting member 31, and the seal removing operating member 84 is formed in the driving means 27. Since the thread removing main body 83 is formed to operate in conjunction with the operation when the first fitting support 24 and the second fitting support 25 are fitted with the upper thread T, the upper thread T ) Can always be a fixed position (timing).

17 to 24 show another embodiment of the upper thread clamping device of the sewing machine according to the present invention. In addition, about the structure similar to the upper thread clamping apparatus of 1st Embodiment mentioned above, the same code | symbol is attached | subjected to a main part only in a figure, and detailed description is abbreviate | omitted. 17-24, only the main part is attached | subjected.

The upper thread clamping device 10A of the present embodiment forms the seal removal main body 83A of the seal removal means 30A in the drive means 27, and simultaneously seals the seal removal operation member 84A with the first fitting member ( 31), and the thread removing main body 83A is formed to operate in conjunction with the operation when the first fitting portion 24 and the second fitting portion 25 are fitted with the upper thread T.

That is, as shown in FIG. 17 and FIG. 18, in the Y-axis direction-side part of the formation position of the real trap part 33 of the outer surface located in the X-axis direction-side of the 1st fitting member 31, The seal removal operation member 84A is extended. The seal removal operation member 84A includes a base portion 84Aa (base body) having a substantially rectangular shape in a plane extending from the first fitting support member 31 toward the X-axis direction -side, and the base portion. It has the flat-shaped drive part 84Ab extended downward from the front-end | tip located in the X-axis direction-side of 84Aa to the Z-axis direction-side. The rear end located on the X-axis direction − side of the drive portion 87Ab is in contact with and spaced apart from the input arm 86a of the seal removal arm 85A of the seal removal main body 83A.

The seal removal main body 83A is attached to the lower surface of the seal removal main body attaching portion 91 formed on the guide plate 63. The seal removal main body attaching portion 91 extends from the central portion of the distal end face positioned on the + -axis side of the guide plate 63 to protrude toward the + -axis direction + side near the X-axis direction-side. A substantially rectangular parallelepiped stopper 92 extends downward at a tip end having a portion 91a and located on the Y-axis direction + side of the bottom surface of the attachment base portion 91a. And the screw hole 93 which penetrates in the thickness direction is formed in the substantially center part of the attachment base part 91a.

83 A of said thread removal main bodies are substantially flat toward the X-axis direction + side from the rear end located in the Y-axis direction-side of the flat thread-shaped thread removal arm 85A long in the front-back direction, and the said thread removal arm 85A. It is formed in the bell crank shape as a whole by the plate-shaped input arm 86A extended at right angles. Moreover, the claw part 85Aa extended toward the X-axis direction + side is formed in the front-end | tip part of the thread removal arm 85A, and is formed so that it may become a hook shape as a whole. The thread is captured by the thread removal main body 83A on the base portion of the claw portion 85Aa, which is a connecting portion of each side surface located on the X-axis direction + side of the claw portion 85Aa and the thread removal arm 85A. The recessed part 85Ab as a part is formed. In addition, an insertion through hole 87A penetrating in the vertical direction is formed in the connection portion between the seal removal arm 85A and the input arm 86A, and the seal removal main body 83A is formed in the insertion hole 87A. (88A) for the stepped mounting screws which function as a support pin for supporting () are inserted from below.

The attaching stepped screw 88A is screwed to the threaded hole 93 of the attaching plate portion 91 for the thread removing main body, and the seal removing main body 83A is centered on the attaching stepped screw 88A. The rotation is possible. A torsion coil spring 89A as a pressing means is attached to the stepping screw 88a for attachment. The torsion coil spring 89A is disposed on the lower surface side of the seal removal main body 83A, and one end thereof is caught by the rear end located on the Y-axis direction-side of the input arm 86A, and the other end is attached to the seal removal main body. It hangs on the outer periphery of the pin-shaped spring hanger part 94 (FIG. 18) erected on the lower surface of the attachment base part 91a of 91. As shown in FIG.

The seal removing main body 83A is always in contact with the stopper 92 by the pressing force (spring force) of the torsion coil spring 89A on the right side located at the X-axis direction-side of the seal removing arm 85A. , The maximum rotational position in the counterclockwise direction is regulated when viewed from above, which is the Z-axis direction + side, so that the seal removal arm 85A is clockwise along the horizontal plane when viewed from the top with respect to the mounting stepped screw 88A. It is configured to allow rotation only in the counterclockwise direction. In this state, 85 A of thread removal arms are arrange | positioned substantially parallel to the thread capture | acquisition part 33 in the side located in the X-axis direction-side of the thread capture part 33, 33) to maintain the position away from. Moreover, the claw part 85a of the thread removal arm 85 is arrange | positioned on the extension line substantially along the X-axis direction of the front end of the thread capture | acquisition part 33, and the thread removal main body 83A has a stepped screw for attachment ( When it rotates clockwise as viewed from the top with respect to 88A, the thread removal arm 85A is comprised so that it may cross immediately below the thread capture | acquisition part 33. As shown in FIG.

While the seal removal operation member 84A and the fitting means 26 reach the fitting support position from the initial position, the tip abuts against the input arm 86A to initiate rotation of the thread removing main body 83A. When the support means 26 reaches the release position beyond the fitted support position, the rotation of the seal removal main body 83A is configured to end.

Incidentally, the seal removal operating member 84A is not limited to the first fitting member 31, but may be disposed on other fixing portions such as the bed portion 2 or the like.

The seal removal operation member 84A may be a screw member capable of adjusting the amount of protrusion on the Y-axis direction − side, and may be configured to change the contact position with the input arm 86A. According to such a structure, the precision of a component can be eased and cost can be reduced, and the rotation timing and opening angle of the thread removal main body 83A can be adjusted in detail, and it sets finely about the thickness and strength of the upper thread T. It can prevent a thread cutting, and can further improve the quality of sewing.

The other configurations are the same as those of the upper thread clamping device 10 of the first embodiment described above, and thus detailed description thereof will be omitted.

The upper thread clamping device 10A of the present embodiment operates in the same manner as the upper thread clamping device 10 of the first embodiment described above.

That is, the thread removal means 30A of the upper thread clamping device 10A of the present embodiment is, as shown in Figs. 19 and 20, while the fitting means 26 reaches the fitting supporting position from the initial position. The rear end of the removal operation member 84A abuts the input arm 86A. And since the input arm 86A is pressed against the thread removal operation member 84A by further moving to the rearward direction toward the insertion position of the 1st fitting support part 24, the seal removal main body 83A is a torsion coil spring ( Against the pressing force of 89A), the counter-clockwise direction (clockwise when viewed from the top) of FIG. 20, that is, the tip side of the thread removal arm 85A, is centered around the mounting stepped screw 88A. Initiate rotation along the horizontal plane to face.

Subsequently, when the fitting means 26 is positioned at the fitting supporting position from the initial position, the thread removing means 30A has a seal centered around the attaching stepped screw 88A as shown in Figs. 21 and 22. The thread end portion of the upper thread T, which is rotated so that the distal end side of the removal arm 85A faces the thread trapping portion 33, and is lowered from the fitting portion of the upper thread T by the fitting means 26 ( TA) is captured by the recessed portion 85Aa of the thread removal arm 85A just below the thread trapping portion 33, and is removed from the X-axis direction + side and the Y-axis direction-side.

Subsequently, when the fitting means 26 is positioned at the release position from the fitting support position, the thread removing means 30A is centered around the mounting stepped screw 88A as shown in FIGS. 23 and 24. The distal end of the thread removal arm 85A is further rotated to face the thread capture portion 33 to complete the thread removal.

According to the upper thread clamping device 10A of the present embodiment having such a configuration, the seal removing main body 83A is formed on the driving means 27, specifically, the guide plate 63, and the seal removing operating member 84A. Is formed in the first fitting member 31, and the thread removal main body 83 is interlocked with the operation when the first fitting support 24 and the second fitting support 25 fit the upper thread T. Since it is formed so that it can operate, it can exhibit the same effect as the upper thread clamping device 10 of the above-mentioned embodiment, and can fix | immobilize (stabilize) the path | route of thread removal with respect to the path | route of the upper thread T, Since the load of the removed upper thread T can be received by the fixed guide plate 63, even if the upper thread T is thick, stable thread removal can be reliably performed.

In addition, the thread removal means of the upper thread clamping device of the sewing machine of the present invention can be used for the upper thread clamping device of various conventional sewing machines.

In addition, this invention is not limited to each embodiment mentioned above, It can change variously as needed.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an external front view of a part of an essential part of a sewing machine provided with an embodiment of an upper thread clamping device of a sewing machine according to the present invention.

FIG. 2 is an enlarged view showing the main part near the kiln of the sewing machine of FIG.

3 is a block diagram showing the main part of the sewing machine of FIG.

Figure 4 is a perspective view showing the main part of an embodiment of the upper thread clamping device of the sewing machine according to the present invention.

5 is an exploded perspective view of the main part of FIG. 4.

6 is an enlarged exploded perspective view of the main part of FIG. 4.

7 is an explanatory view showing a main part of an operating state in which the upper thread fitting means of the upper thread clamping device of FIG. 4 is located at an initial position.

8 is an enlarged view of a main part of the upper thread fitting means of FIG.

9 is a bottom view of an essential part of the upper thread clamping device of FIG. 7;

FIG. 10 is a partially enlarged view near the thread removing means of FIG. 9. FIG.

FIG. 11 is a view similar to FIG. 7 showing a main part of an operating state in which the upper thread clamping means of the upper thread clamping device subsequent to FIG. 7 reaches a position where the thread removing means starts operating at an intermediate position between the initial position and the clamping position; .

12 is a bottom view of the main part of FIG.

FIG. 13 is a view similar to FIG. 7 showing a main part of an operating state in which the upper thread clamping means of the upper thread clamping device subsequent to FIG. 11 is located at the clamping position.

14 is a bottom view of the main part of FIG. 13.

FIG. 15 is the same view as FIG. 7 showing the main part of the operating state in which the upper thread fitting means of the upper thread clamping device continued from FIG. 13 is in the released position.

16 is a bottom view of the main part of FIG. 15.

17 is the same view as FIG. 6 which shows the principal part of another embodiment of the upper thread clamping apparatus of the sewing machine which concerns on this invention.

18 is a bottom view of FIG. 17.

FIG. 19 is a view similar to FIG. 7 showing a main part of an operating state in which the upper thread clamping means of the upper thread clamping device of FIG. 17 has reached the position where the thread removing means starts its operation at an intermediate position between the initial position and the clamping position.

20 is a bottom view of the main part of FIG. 19.

FIG. 21 is a view similar to FIG. 7 showing a main part of an operating state in which the upper thread clamping means of the upper thread clamping device subsequent to FIG. 19 is located at the clamping position; FIG.

22 is a bottom view of the main part of FIG. 21.

FIG. 23 is the same view as FIG. 7 showing the main part of the operating state in which the upper thread fitting means of the upper thread clamping device continued from FIG. 21 is in the released position;

24 is a bottom view of a main part of FIG. 23.

25 is an explanatory view showing a state where the upper thread is clamped in the upper thread clamping device of the conventional sewing machine.

Fig. 26 is an explanatory view showing a state where a thread end enters into the upper thread loop in the upper thread clamping device of the conventional sewing machine.

FIG. 27 is an explanatory diagram showing a state in which the thread end of the upper thread is pulled up together with the upper thread loop continued from FIG. 26.

It is explanatory drawing which shows the state in which the loop part which the threaded end part of the upper thread following FIG. 27 sewed into the stitches of the back of a cloth, and passes through a thread capture part was formed.

Explanation of symbols on the main parts of the drawings

1: sewing machine 8: needle plate

8a: needle hole 9: kiln mechanism

10, 10A: upper thread clamping device 11: control means

24: first fitting support 25: second fitting support

26: upper thread fitting means 27: driving means

28: means of movement 29: related movement means

30, 30A: seal removing means 31: first fitting member

32: second fitting member 33: seal capture

34: Attachment plate part for seal removal main body 35, 93: Screw hole

36, 92: stopper 55: Y-axis moving mechanism

56: moving position detecting means 63: guide plate

83, 83A: Thread removal body 84, 84A: Thread removal operating member

85, 85A: Thread removal arm 86, 86A: Input arm

89, 89A: torsion coil spring 91: seal removal body attachment part

94: spring hook portion N: sewing needle

Na: Thread through hole NL: Shanghai east route

T: Upper thread TA: Thread end

TL: upper thread loop

V: Thread path (connecting the upper thread fitting support and the kiln)

W: loop

Claims (4)

Upper thread fitting means for capturing and threading the threaded end of the upper thread, and driving means for driving the upper thread fitting means, At the start of sewing, the thread end portion of the upper thread inserted into the thread passage hole of the sewing needle is caught and supported at the position below the needle plate and at a position spaced apart from the shanghai route of the sewing needle, and then set in advance. As the upper thread clamping device of the sewing machine which is formed to release the end of the thread of the upper thread which is held after the needle drop to When the upper thread clamping means catches and threades the threaded end of the upper thread, the thread is arranged to be spaced apart from the pulling path of the upper thread loop in the threaded end of the threaded end by the upper thread clamping means. Upper thread clamping device of the sewing machine characterized in that it has a thread removal means for removing the. The method of claim 1, The upper thread fitting means has a thread capture portion formed in a frame shape through which the sewing needle penetrating the needle hole of the needle plate can pass through the inside, The seal removing means includes: a seal removing main body which is movable in the horizontal direction and is pressurized to be spaced apart from the seal trap by the pressing means; And a seal removal operation member disposed to be in contact with and spaced apart from the seal removal body, And the thread removing operating member abuts on the thread removing main body to operate the thread removing main body to remove a portion of the thread end portion. The method of claim 2, The upper thread fitting means includes a first fitting member having a first fitting portion formed in the thread capturing portion, and a first fitting supporting portion arranged to be relatively in contact and spaced apart from the first fitting supporting portion. It has a 2nd fitting support member which has a 2nd fitting support part which clamps the said thread end part between, The driving means may include at least an initial position in which the inside of the seal capturing unit is located on the shanghai east route, and wherein the first fitting support and the second fitting support unit oppose to both sides with the shanghai east route interposed therebetween; The first fitting support and the second fitting support are spaced apart to the side of the shanghai path, and two positions with the fitting supporting position for fitting the threaded end between the first fitting support and the second fitting support. It is formed to be capable of driving the upper thread fitting means to be selectively taken, The seal removing body is formed in the first fitting member, The seal removing operation member is formed in the drive means, The upper thread clamping device of the sewing machine, characterized in that the thread removal main body is operated in conjunction with the operation when the first fitting support and the second fitting support to hold the thread end. The method of claim 2, The upper thread fitting means may include a first fitting member including a first fitting support portion formed at the thread catching portion, and a first fitting support member and a first fitting support member to be relatively in contact and spaced apart from each other. It has a 2nd fitting support member which has a 2nd fitting support part which clamps the said thread end part between, The driving means may include at least an initial position in which the inside of the seal capturing unit is located on the shanghai east route, and wherein the first fitting support and the second fitting support unit oppose to both sides with the shanghai east route interposed therebetween; The first fitting support and the second fitting support are spaced apart to the side of the shanghai path, and two positions with the fitting supporting position for fitting the threaded end between the first fitting support and the second fitting support. It is formed to be capable of driving the upper thread fitting means to be selectively taken, The seal removing body is formed in the driving means, The seal removal operation member is formed in the first fitting support member, The upper thread clamping device of the sewing machine, characterized in that the thread removal main body is operated in conjunction with the operation when the first fitting support and the second fitting support to hold the thread end.

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