KR101419409B1 - Sewing machine - Google Patents

Abstract

In the present invention, the release amount of the thread is changed in conjunction with the up-and-down movement of the cloth press.

A sewing machine (1) comprises a presser bar (33) which is provided at the lower end of the sewing machine to press the cloth and which moves the cloth presser up and down by upward and downward movement, A thread take-off unit is provided between the thread take-up unit and the thread take-up unit, and the thread is fixed by hanging the thread. At the same time, by moving in one direction, A yarn guide portion 5 for reducing the amount of yarn loosening by the yarn feeder and an interlocking mechanism 7 for moving the yarn guide portion 5 in one direction or reverse direction in conjunction with the vertical movement of the push rod 33 do.

Description

[0001] SEWING MACHINE [0002]

The present invention relates to a sewing machine having a yarn guide portion.

Generally, a sewing machine is provided with a yarn guide portion for guiding a thread loosened from a yarn supply source such as a yarn winding portion to a needle eye of a needle (see, for example, Patent Document 1). The yarn guide portion is provided, for example, between yarn paths extending from the yarn winding portion to the yarn winding machine, and guides the yarn loosened by the up-and-down movement of the yarn take- The yarn guide portion is fixed to the front side (the side facing the user) of the sewing machine body. When the amount of loosening of the yarn by the yarn dispenser is adjusted, the yarn guide portion is moved leftward and rightward It was.

[Patent Document 1] Japanese Utility Model Laid-Open Publication No. H6 (1994) -72575

However, since the yarn guide portion can not move the yarn guide portion during sewing, the vertical stroke of the yarn drawing during sewing, that is, the yarn unwinding amount by the yarn drawing machine was always constant. Therefore, in the case of sewing a workpiece having a suddenly changing thickness, such as an end portion, the consumption amount of the yarn at the end portion is abruptly changed, and the sewing defects such as the phenomenon of skipping of the needle, skipping of the yarn, There has been a problem in that it occurs.

9, a yarn guide portion 203 is attached to a push rod 202 for supporting a cloth pusher 201, and a cloth pusher 201 is attached to the end portion of the end portion The bottom dead point of the yarn guide portion 203 is raised together with the push rod 202 to slacken the yarn, thereby increasing the thread loosening amount.

However, although the thread releasing amount can be increased at the moment when the cloth presser 201 is placed on the end portion, since the thread releasing amount is restored to its original value after the cloth presser 201 is placed on the end portion, It was difficult to do.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a sewing machine capable of changing the unloading amount of a thread in conjunction with the up and down movement of a cloth press.

According to a first aspect of the present invention, there is provided a sewing machine comprising: a push rod which is supported by a device frame so as to be movable up and down and which is supported by a lower end of the cloth presser and which is urged downward; And a yarn guide portion provided between the yarn feeding portion and the yarn feeding portion to allow the position of the yarn feeder to be displaced by fixing the yarn by fixing the yarn therebetween, the sewing machine comprising: And the thread guide portion is connected to the push rod so as to displace the thread guide portion in one direction or the opposite direction by moving the thread guide portion to the adjusting body And an interlocking mechanism.

According to the invention as set forth in claim 1, when the cloth thickness is changed and the cloth pad is moved up and down, the pad pushing up the cloth pad also moves up and down. At this time, the interlocking mechanism moves the yarn guide in one direction or reverse direction in conjunction with the vertical movement of the push rod. The yarn guide portion moves in one direction or in the reverse direction, thereby making it possible to change the loosening amount of the yarn by the yarn breaker.

Thereby, the amount of unwinding of the yarn can be changed in conjunction with the up-and-down movement of the cloth press.

According to a second aspect of the present invention, in the sewing machine according to the first aspect of the present invention, the adjusting member includes a cam, the interlocking mechanism includes a cam pressing plate fixed to the push rod, And the cam is pushed by the cam pressing plate by the up and down movement of the push rod, so that the abutment position of the yarn guide portion and the cam is displaced in the one direction or the opposite direction Is formed.

According to the invention as set forth in claim 2, when the push rod ascends, the cam rotates. Since the outer shape of the cam is formed such that the abutment position between the yarn guide portion and the cam is displaced in one direction or the opposite direction, when the cam is rotated, the yarn guide portion attached to the urging member is moved in one direction Moves in the reverse direction.

As a result, the amount of unwinding of the yarn by the yarn breaker can be increased.

As a result, when the thickness of the cloth pressed by the cloth presser becomes thick, the yarn guide portion moves in one direction or in the reverse direction, and the amount of loosening of the yarn by the yarn breaker can be increased. Therefore, the amount of loosening of the yarn can be adjusted according to the thickness of the cloth.

According to a third aspect of the invention, there is provided a sewing machine according to the second aspect, wherein the sewing machine includes a gap adjusting member which contacts the cam and adjusts the distance between the cam pressing plate and the cam by rotation thereof.

According to the invention as set forth in claim 3, since the distance between the cam pressing plate and the cam is formed in advance by the amount of projection from the needle plate of the feed tooth located below the cloth presser by the gap adjusting member, (Backlash) of the camshaft is not transmitted to the cam.

Thus, the amount of unwinding of the yarn can be adjusted in a state in which the influence of the feeding teeth at the time of sewing is removed.

According to a fourth aspect of the present invention, there is provided a sewing machine according to the second aspect of the present invention, wherein the yarn guide portion includes a guide portion for guiding the yarn to the machine tool by fixing the yarn thereto, and the guide portion is provided so as to adjust the attachment position in the one direction and the reverse direction And a base portion attached to the biasing member to come into contact with the cam.

According to the invention as set forth in claim 4, since the guide portion is provided on the toe portion, and the base portion is brought into contact with the cam, the guide portion can adjust the attachment position in one direction and reverse direction even when attached to the toe portion. In addition, the toe portion itself can also be controlled to move in one direction and the opposite direction by the toe portion and the cam.

Accordingly, since the position of the guide portion can be adjusted in two steps with respect to the cam, the adjustment range of the position can be widened, so that the amount of loosening of the thread by the thread winding machine can be finely adjusted.

According to the invention as set forth in claim 1, the release amount of the thread can be changed in conjunction with the vertical movement of the cloth press.

According to the invention as set forth in claim 2, when the thickness of the cloth pressed by the cloth presser becomes thick, the thread guide portion moves in one direction or the opposite direction, and the amount of unwinding of the thread by the thread threader can be increased. Therefore, the amount of loosening of the yarn can be adjusted according to the thickness of the cloth.

According to the invention described in claim 3, the amount of unwinding of the yarn can be adjusted in a state in which the influence of the feeding teeth at the time of sewing is removed.

According to the invention as set forth in claim 4, since the guide part can adjust the position in two steps with respect to the cam, the adjustment range of the position can be widened, and the amount of loosening of the thread by the thread machine can be finely adjusted.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the best mode of a sewing machine according to the present invention will be described in detail with reference to the drawings.

≪ Embodiment 1 >

(Configuration of sewing machine)

1, the sewing machine 1 is provided with a bed portion 2 for accommodating a bobbin 21 and a lower shaft 22, a needle bar (not shown) provided upright on the bed portion 2 for holding the needle 31 32) and an arm portion (3) for receiving the phase shaft.

On the upper surface of the bed part 2, a needle plate 23 having a needle hole 24 is provided. A hook 21 is provided below the needle plate 23 in the bed part 2. [

The hook 21 is also rotated by the sewing machine motor 21 in conjunction with the lower shaft 22 by driving of the sewing machine motor.

The arm portion (3) has a shoulder portion (3a) extending downward from its tip end. A needle bar (32) having a needle (31) supported at its lower end is provided on the jaw (3a) so as to be movable up and down. The needle bar 32 is connected to an upper shaft (not shown) through a crank mechanism or the like. The upper shaft rotates in conjunction with the sewing machine motor. Therefore, the needle 31 and the needle bar 32 are moved up and down by driving the sewing machine motor.

At the tip of the arm portion 3, a push rod 33 is supported so as to be movable up and down. At the lower end of the push rod 33, a cloth pad 34 is detachably attached and has a well-known structure in which a cloth pad 34 is pressed against the upper surface of the needle plate 23 by a spring . 2, a cam pressing plate 35 is newly provided on the upper end of the push rod 33. In this case,

As shown in Fig. 1, on the upper surface of the arm portion 3, a yarn guide bar 41 for guiding a yarn from a thread wound portion (not shown) is provided. A first thread tension regulating device 42 is provided on the front surface of the arm portion 3. A second thread tension regulating device 43 is provided below the front face of the arm portion 3 below the first thread tension regulating device 42. [ The second thread tension regulating device (43) is provided with a thread catch spring (44). On the left side of the second yarn tension adjusting device 43, there is provided an arm chamber guide portion (push rod holder thread guide portion) 45.

A yarn guide portion 5 is provided on the front face of the arm portion 3 and between the first yarn tension adjusting device 42 and the second yarn tension adjusting device 43. [ A thread take-up unit 6 is provided on the left side of the yarn guide unit 5 so as to extend from the front of the arm unit 3 to the front side (operator side), and the thread take- As shown in Fig. The thread take-up device 6 is connected to the upper shaft via a thread take-up gear train mechanism or the like, and moves up and down by driving the sewing machine motor.

The thread path of the upper thread (T) is as follows. The upper thread T from the upper thread supply source is passed through the hole of the thread guide rod 41 and is then guided to the first thread tension regulating device 42 and thereafter guided to the second thread tension regulating device 43 do. Then, the thread catch is caught by the spring 44, then caught by the arm chamber guide portion 45, then passed through the yarn guide portion 5, then passed through the thread catcher 6, And passes through the needle hole of the needle 31.

The upper thread T and the bobbin thread (lower thread) in the bobbin case 21 are intertwined with each other by the cooperation with the bobbin 21 when the needle 31 is moved up and down to form needle stitches.

(Yarn guide)

2 to 4, the yarn guide portion 5 is provided with an upper opening and a lower opening so as to allow the thread T between the thread take-up 6 and the thread catching spring 44 to pass therethrough, And a seal member 51 having an annular thread passage portion 51b formed at a left side of the thread passage 6 between the thread take- (The left side in FIG. 2A) of the arm portion 3 and the right side position (the arm portion 3 in which the thread passing portion 51b is moved from the left side to the right side so as to bend the thread path) (The right-hand side in Fig. 2 (a)). The base member 52 has an abutting portion 52a abutting on the cam body 71 (regulating member) to be described later.

The guide member 51 is formed in a plate shape and has an elongated hole 51 extending along the extending direction of the arm portion 3, that is, in the direction of intersection between the thread take- And an attaching portion 51a on which the second engaging portion 51c is formed.

The elongated hole 51c adjusts the position when the guide member 51 is attached to the base member 52. The elongated hole 51c is provided with a fixing screw 53 The guide member 51 is fixed to the base member 52. [ The guide member 51 moves so as to relatively change the position of the fixing screw 53 in the long hole 51c so that the attachment position of the guide member 51 with respect to the base member 52 is adjusted .

The base member 52 is provided at one end thereof with the abutment portion 52a which abuts against the surface of the cam body 71 (the cam surface), and the other end of the base member 52 is provided with a base extending in the moving direction of the guide member 51 One end of the shaft 54 is fixed. The other end of the base shaft (54) is movably inserted into a guide hole (3a) formed in the arm portion (3). Therefore, the arm portion 3 functions as a bearing of the base shaft 54. [

(Interlocking mechanism)

2 to 4, the interlocking mechanism 7 includes a cam body 71 which is disposed above the cam pressing plate 35 and is rotatable by the elevation of the push rod 33 and has a cam surface on the outer periphery, And a spring 73 as a pressing member for urging the abutting portion 52a of the yarn guide portion 5 against the cam surface of the cam body 71. [

The cam body 71 is formed in a substantially triangular shape when viewed from the front with three top portions 71a, 71b and 71c and rotates about the top portion 71a with respect to the camshaft 72 fixed to the arm portion 3 So that it is supported as much as possible. The height of the top portion 71b and the top portion 71c are substantially the same as shown in Fig. 2 (a).

2 (b), a coil spring 75 having one end fixed to the arm 3 and the other end fixed to the cam body 71 is mounted on the camshaft 72, The cam body 71 is attached in the counterclockwise direction of Fig. The spring constant of the coil spring 75 is set to be a spring force that is stronger than that of the spring 73.

The presser bar 33 is provided with a cam presser plate 35 that abuts the lower side of the top portion 71b side located on the left side in Fig. 2 (a) in a state in which the cloth is not pressed.

The abutment portion 52a of the base member 52 is disposed so as to abut the cam surface in the vicinity of the top portion 71c between the top portion 71a and the top portion 71c. The spring 73 is compressed and wound on the base shaft 54 so as to engage both ends with the base member 52 and the arm portion 3 so that the yarn guide portion 5 is always wound on the cam body 71 It is added in the direction of pressing.

3) of the base member 52 in the leftward direction of FIG. 3 (as shown in FIG. 2) so as to face the front end side (left side in FIG. 3) of the arm portion 3 in the movement path of the base member 52, (left direction in Fig. 7A).

(Yarn guidance operation)

As shown in Fig. 5, when the push rod 33 is lifted by the thickness of the end portion of the cloth pushing pin 35 as the cloth pusher 34 sits on the edge of the cloth during sewing, the cam pushing plate 35 is integrally lifted. The cam body 71 in which the leading end of the cam pressing plate 35 is engaged in the vicinity of the top portion 71b is moved in the direction in which the cam pressing plate 35 is lifted up against the spring force of the coil spring 75, And rotates in the clockwise direction of Fig. 5 by the rotation angle. The outer periphery connecting the top portion 71a and the top portion 71c is displaced toward the tip end side of the arm portion 3 (left direction in Fig. 5) by the rotation of the cam body 71 in the clockwise direction. The base member 52 that engages the abutting portion 52a with the cam body 71 moves to the tip end side of the arm portion 3 following the displacement of the cam body 71 by the biasing force of the spring 73 . The position of the thread passing portion 51b of the thread guide portion 5 is also displaced toward the tip end side of the arm portion 3 by the amount of movement corresponding to the cloth thickness of the end portion so that the gap between the thread take- Thereby shortening the actual path of the light beam. In this state, when the thread take-up machine 6 is raised by the operation of the sewing machine, the actual thread take-up amount is increased.

This state continues until the end passes under the cloth pusher 34.

It is not limited to the end portion but may follow the rising amount of the push rod 33 depending on the cloth thickness under the cloth pusher 34 so that the thread passing portion 51b are displaced and held.

Further, when the thickness of the cloth is reduced and the push rod 33 is lowered, the cam body 7 is urged counterclockwise by the coil spring 75 and rotates. Therefore, As shown in Fig.

(Action effect)

As described above, according to the sewing machine 1, when the push rod 33 rises, the cam body 71 rotates, and the abutting position between the yarn guide portion 5 and the cam body 71 is displaced toward the tip side of the arm portion 3 The yarn guide portion 5 attached to the spring 73 moves toward the tip end side of the arm portion 3 along the outer shape of the cam body 71. As a result,

As a result, the unwinding amount of the yarn when the thread take-up machine 6 is lifted can be increased.

As a result, when the thickness of the cloth pressed by the cloth pusher 34 becomes thick, the yarn guide portion 5 moves to the tip end side of the arm portion 3 and the amount of loosening of the yarn by the thread take- It is possible to adjust the loosening amount of the yarn depending on the thickness of the cloth at all times.

The yarn guide portion 5 is structured so that the guide member 51 for hanging and fixing the thread is provided on the base member 52 and the base member 52 is brought into contact with the cam body 71, Even when the base member 51 is attached to the base member 52, the attachment position can be adjusted to the front end side and the base end side of the arm portion 3. The base member 52 itself can also control the movement toward the tip end side and the base end side of the arm portion 3 by the base member 52 and the cam body 71. [

Thus, the range of adjustment of the position of the guide member 51 is widened, and the amount of loosening of the thread by the thread take-up unit 6 can be finely adjusted.

≪ Embodiment 2 >

Next, a second embodiment will be described with reference to FIG. In Embodiment 2, the same components as those in Embodiment 1 are denoted by the same reference numerals, and a description thereof will be omitted.

The cam body (adjustable body) 84 rotatably supported on the machine frame of the sewing machine 1a is formed in a substantially triangular shape when viewed from the front with three crests 84a, 84b and 84c, Which is rotatably supported by a camshaft 85. [0031] The cam body 84 is formed such that the outer periphery connecting the top portion 84a and the top portion 84b is longer than the outer periphery connecting the top portion 84a and the top portion 84c, 71).

The cam presser plate 35 is disposed so as to abut the outer circumference that connects the top portion 84b and the top portion 84c in the vicinity of the top portion 84b.

The base member 52 of the yarn guide portion 5 is arranged so as to abut the outer periphery connecting the top 84a and the top 84c in the vicinity of the top 84c. The outer circumferential portion connecting the top portion 84a and the top portion 84c is formed so that the abutment position between the yarn guide portion 5 and the cam body 84 is displaced toward the tip side of the arm portion 3 by the rotation of the cam body 84 Respectively.

Here, the yarn guide portion 5 is urged in the direction in which the cam body 84 is pressed by the spring 73. The base shaft 54 is passed through the spring 73 and the spring 73 is expanded and contracted in accordance with the change in the distance between the arm portion 3 and the base member 52. The spring 73 is provided between the base member 52 and the arm portion 3 in a state of being reduced in length from the natural length and by applying the reaction force to the arm portion 3 by the elastic force, And is pressed against the cam body 84.

(Gap adjusting member)

The eccentric pin 8 functioning as the gap adjusting member includes a rotating shaft 81 formed of screws screwed on the machine frame so as to be rotatable by a user or the like while exposing the head portion to the front side of the arm portion 3, And an eccentric portion (82) eccentrically disposed with respect to the base. The rotating shaft 81 is provided so that the tangent line passing through any point on the outer circumference coincides with the tangent line passing through any point on the outer periphery of the eccentric portion 82 and the upper end of the rotating shaft 81 is not pressed And the height of the upper end of the cam pressing plate 35 in the push rod 33 of the cam plate 33 is made equal.

The eccentric portion 82 of the eccentric pin 8 is arranged to be engageable with the lower side connecting the top portion 84b and the top portion 84c of the cam body 84 in the vicinity of the top portion 84b.

The eccentric pin 8 rotates the rotation shaft 81 to change the engaging part of the eccentric part 82 with the cam body 84 so that the upper end of the cam pressing plate 35 and the top part 84b of the cam body 84, And the outer circumferential portion connecting the outer circumferential portion 84c.

A stopper screw 83 for preventing the rotation of the rotary shaft 81 is provided on the side of the rotary shaft 81. The rotation of the rotary shaft 81 is prevented by abutting the stopper screw 83 against the rotary shaft 81 , The position of the eccentric pin 8 can be determined.

(Operation of eccentric pin)

6, when the distance between the cam body 84 and the cam pressing plate 35 is adjusted by the eccentric pin 8, the amount of protrusion of the feed tooth provided on the bed portion 2 from the needle plate 23 The distance between the rotary shaft 81 and the outer circumference connecting the summit 84b and the summit 84c of the cam body 84 is changed.

When the cam body 84 and the cam presser plate 35 are to be brought into contact with each other, a portion of the eccentric portion 82 which is eccentric from the rotary shaft 81 is positioned so that the rotary shaft 81 is positioned above the eccentric pin 8 Is moved downward relative to the rotary shaft (81). On the other hand, when it is desired to drop the cam body 84 and the cam pressing plate 35 as much as possible, the rotating shaft 81 is eccentrically rotated from the rotating shaft 81 of the eccentric portion 82 so as to be positioned below the eccentric pin 8 Thereby moving the part above the rotating shaft 81. [

(Action effect)

According to the sewing machine 1a, the cam pressing plate 35 at the upper end of the push rod 33 and the cam plate 35 at the upper end of the push rod 33 are pushed by the eccentric pin 8 by the projecting amount of the feed tooth from the needle plate 23 below the cloth push- The interval between the first and second electrodes 84 and 84 can be previously formed. Since this space absorbs the seizure of the feeding teeth, the seizure at the time of feeding the cloth by the feeding teeth is not transmitted to the cam body 84.

Thus, the amount of unwinding of the yarn can be adjusted in a state in which the influence of the feeding teeth at the time of sewing is removed.

≪ Embodiment 3 >

Next, the third embodiment will be described with reference to FIG. In the third embodiment, the cam shape of the cam body is changed, and the same components as those in the first embodiment are denoted by the same reference numerals, and a description thereof will be omitted.

The cam body (regulating body) 90 is formed in a rough diamond shape when viewed from the front with four crests 90a, 90b, 90c and 90d. The heights of the top portion 90b and the top portion 90d are substantially the same.

The cam body 90 is pivotally supported by the machine frame of the sewing machine 1b so as to be rotatable by the camshaft 91 in the vicinity of the top portion 90a at the uppermost position.

The cam presser plate 35 is disposed so as to abut the outer periphery connecting the top portion 90b and the top portion 90c in the vicinity of the top portion 90b.

In addition, the cam body 90 is formed such that the length thereof to the outer periphery connecting the adjacent top portions 90a to 90d is substantially equal.

The base member 52 of the yarn guide portion 5 is disposed so as to abut the outer periphery connecting the top portion 90c and the top portion 90d in the vicinity of the top portion 90d. The outer periphery connecting the top portion 90c and the top portion 90d is formed so as to extend obliquely upward from the top portion 90c in Fig. 7, and the rotation of the cam body 90 by the elevation of the push rod 33 (Reverse direction) of the arm portion 3 by the cam guiding portion 5 and the cam guiding portion 5, as shown in Fig.

Here, the yarn guide portion 5 is attached in the direction in which the cam body 90 is pressed by the spring 73. The base shaft 54 is passed through the spring 73 and the spring 73 is expanded and contracted by a change in the distance between the arm portion 3 and the base member 52. The spring 73 is provided between the base member 52 and the arm portion 3 in a state of being reduced in length from the natural length and by applying the reaction force to the arm portion 3 by the elastic force, And is pressed against the cam body 90.

(Yarn guidance operation)

7, when the push rod 33 rises as the cloth pusher 34 comes to the end of the cloth during sewing, the top portion 90b of the cam body 90 is lifted from the front face of the arm portion 3 And rotates clockwise about the camshaft 91 when viewed. The top portion 90d of the cam body 90 also rotates clockwise around the camshaft 91 when viewed from the front of the arm portion 3. [ As a result, the top portion 90b moves upward, and the top portion 90d moves downward. As the top portion 90d moves downward, the outer periphery connecting the top portion 90c and the top portion 90d moves toward the tip side (one direction) of the arm portion 3. The rotational movement of the cam body 90 causes the base member of the yarn guide portion 5 pressed by the spring 73 to the outer periphery connecting the top portion 90c and the top portion 90d of the cam body 90, The cam body 52 is pushed by the cam body 90 and moves to the base end side (reverse direction) of the arm portion 3. Therefore, the abutting position between the yarn guide portion 5 and the cam body 90 is displaced to the base end side of the arm portion 3, and the engagement position of the yarn between the yarn guide portion 5 and the cam body 90 is also shifted to the base end .

(Action effect)

As described above, according to the sewing machine 1b, when the push rod 33 rises, the cam body 90 rotates. The outer shape of the cam body 90 is formed such that the abutting position between the yarn guide portion 5 and the cam body 90 is displaced toward the base end side of the arm portion 3. When the cam body 90 rotates, 5 move toward the proximal end side of the arm portion 3 against the urging force of the spring 73 along the outer shape of the cam body 90.

As a result, the amount of loosening of the yarn when the thread take-up 6 is lifted can be reduced.

This allows the yarn guide portion 5 to move to the proximal end side of the arm portion 3 in accordance with the rotation angle of the cam body 90 when the push rod 33 is lifted due to the thick cloth, It is possible to make the needle sweat hard.

≪ Fourth Embodiment >

Next, a fourth embodiment will be described with reference to FIG. In Embodiment 4, the configuration of the yarn guide portion and the interlocking mechanism is changed. Particularly, the yarn guide portion is moved up and down in accordance with the fabric thickness, thereby adjusting the yarn unwinding amount at the time of thread take- The same reference numerals are assigned to the same components as those of the first embodiment, and a description thereof will be omitted. The vertical direction in Fig. 8 coincides with the vertical direction of the sewing machine 1c.

The yarn guide portion 10 includes a guide member 11 for guiding the yarn from the yarn winding portion to the yarn feeder 6 and a guide member 11 for guiding the yarn from the yarn take- And a base member 12 provided so as to be adjustable in an upward direction to reduce the amount of unwinding of the thread and abutting against the cam body (adjustment body) 101 by being attached to the spring 103.

The guide member 11 is formed in the shape of a plate and has an attachment portion 11a arranged so as to extend along the vertical direction of the guide member 11 and an annularly formed portion extending laterally from one end of the attachment portion 11a, And a thread passing portion 11b so as to be able to pass therethrough.

The attachment portion 11a is formed with an elongated hole 11c extending in the vertical direction and a fixing screw 13 is inserted through the elongated hole 11c into the base member 12, Is fixed to the base member (12). The attachment position of the guide member 11 with respect to the base member 12 can be adjusted in the vertical direction by changing the position of the fixing screw 13 in the long hole 11c.

The base member 12 is disposed such that its one end is in contact with the surface of the cam body 101. The other end of the base member 12 is connected to one end of a base shaft 14 extending in the up and down direction of the arm portion 3 and the other end of the base member 14 is moved in the axial direction Possibly inserted. Thus, the arm portion 3 functions as a bearing of the base shaft 14.

(Interlocking mechanism)

8, the interlocking mechanism 100 is disposed above the push rod 33 and has a substantially rectangular cam body 101 (see Fig. 8) as viewed from the front, which is pivotally supported by the cam shaft 102 at a substantially central position. And a spring 103 as a pressing member for urging the base member 12 of the yarn guide portion 10 against the cam body 101.

The cam presser plate 35 is disposed so as to abut the lower side of the cam body 101 in the vicinity of the top portion 101c in the right lower portion of Fig.

The base member 12 of the yarn guide portion 10 is arranged so as to abut the upper side portion in the vicinity of the top portion 101a of the cam body 101 on the upper left side in Fig.

The spring 103 is wound around the base shaft 14 between the arm portion 3 and the base member 12 and is usually compressed so as to generate a biasing force in the downward direction so that the lower end of the base member 12 And acts to press the cam body 101 against it.

(Yarn guidance operation)

8, when the push rod 33 rises as the cloth pusher 34 sits on the end portion of the cloth during sewing, the top portion 101c of the cam body 101 is pushed up by the push rod 33 The cam body 101 rotates about the camshaft 102 in the counterclockwise direction in Fig. The top portion 101a of the cam body 101 also rotates counterclockwise about the camshaft 102 when viewed from the front of the arm portion 3. Thus, the top portion 101c moves upward, and the top portion 101a, which faces the top portion 101c with the camshaft 102 therebetween, moves downward. The base member 12 of the yarn guide portion 10 pressed by the spring 103 also moves downward in the vicinity of the top portion 101a. Therefore, the abutting position between the yarn guide portion 10 and the cam body 101 is downwardly displaced, and the yarn passage portion 11b of the yarn guide portion 10 is also downwardly displaced.

(Action effect)

As described above, according to the sewing machine 1c, the cam body 101 rotates clockwise or counterclockwise in accordance with the upward and downward movement of the push rod 33, and the yarn guide portion 10 attached to the spring 103 And is displaced in the vertical direction in accordance with the rotation angle of the cam body 101.

Thus, in accordance with the operation of the sewing machine, the amount of unloading of the thread at the time of lifting the thread take-up machine 6 can be increased or decreased according to the position of the push rod.

The yarn guide portion 10 is structured so that the guide member 11 for hanging and fixing the thread is provided on the base member 12 and the base member 12 is brought into contact with the cam body 101, Even when the base 11 is attached to the base member 12, the attachment position can be adjusted above and below the arm portion 3. The base member 12 itself can also control the upward and downward movement of the arm portion 3 by the base member 12 and the cam body 101. [

Accordingly, the position of the guide member 11 can be adjusted according to the rotation angle of the cam body 101, and the adjustment range of the position can be widened, so that the amount of unwinding of the yarn by the thread take-

1 is a front view of a sewing machine.

Fig. 2 (a) is a front view showing the construction of the yarn guide portion and the interlocking mechanism, and Fig. 2 (b) is a side view showing the structure in the vicinity of the cam.

3 is a plan view showing the arrangement of the yarn guide portion and the interlocking mechanism.

4 is a side view showing the arrangement of the yarn guide portion and the interlocking mechanism.

5 is a front view for explaining the operation of the yarn guide portion and the interlocking mechanism.

6 is a front view showing a structure of a yarn guide portion and an interlocking mechanism according to Embodiment 2;

7 is a front view for explaining the operation of the yarn guide portion and the interlocking mechanism according to the third embodiment.

8 is a front view for explaining the operation of the yarn guide portion and the interlocking mechanism according to the fourth embodiment.

9 is a view showing a relationship between a conventional yarn guide portion and a push rod.

Description of the Related Art [0002]

1: sewing machine 5: yarn guide part

6: Thread pulling 7: Interlocking mechanism

8: eccentric pin (gap adjusting member) 11:

12: toothed portion 31: needle

33: Push rod 34: Cloth pad

51: guide portion 52:

71: cam 73: spring (urging member)

84: cam 90: cam

101: cam 103: spring (urging member)

Claims (4)

A push rod which is supported by the device frame so as to be movable up and down and which supports the cloth presser at the lower end and is given an elastic force downward, A thread take-up unit which is operated by the driving of the sewing machine to unwind the thread to be supplied to the needle from the thread take- And a yarn guide portion provided between the yarn winding portion and the yarn feeding portion to allow the position of the yarn removing device to be displaced, An interlock mechanism for connecting the thread guide to the push rod so as to displace the thread guide portion in one direction or the opposite direction by moving the thread guide portion to follow the up and down movement of the push rod, Respectively, The regulator has a cam, Wherein the interlocking mechanism comprises: A cam pressing plate fixed to the push rod, Further comprising a biasing member for biasing the yarn guide portion to abut on the cam, Wherein the cam is formed so that the abutment position of the yarn guide portion and the cam is displaced in the one direction or the opposite direction when the cam is pressed and rotated by the up and down movement of the push rod. delete The method according to claim 1, And a gap adjusting member which contacts the cam and adjusts the distance between the cam pressing plate and the cam by its own rotation. The method according to claim 1, Wherein, A guide member for holding and fixing the thread to guide the thread to the thread take- Wherein the guide member is provided so as to adjust the attachment position in the one direction and the reverse direction, and is abutted against the cam by the biasing member.

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