WO2001090470A1

WO2001090470A1 - Sewing machine

Info

Publication number: WO2001090470A1
Application number: PCT/JP2001/004263
Authority: WO
Inventors: Hiroyuki Kotaki
Original assignee: Juki Corporation
Priority date: 2000-05-23
Filing date: 2001-05-22
Publication date: 2001-11-29
Also published as: JP2002045586A

Abstract

A sewing machine capable of providing a tension by surely holding a needle thread by a tensioning member when the thread is guided automatically, comprising a thread transfer means transferring the needle thread pulled from a thread reel to near a sewing needle, a restricting member (23) covering a specified thread route, and means (13, 25) uncovering the thread route by the restricting member, wherein, when the thread transfer means transfers the needle thread, the needle thread is guided on the thread route.

Description

Specification

Technical field

The present invention relates to a sewing machine for automatically threading an upper thread from a thread spool to a thread path to a needle and then threading the thread through a thread hole of the needle.

Background art

Japanese Patent Publication and Unexamined Patent Publication No. Hei 11-2355391 disclose thread transfer means for transferring an upper thread pulled out from an upper thread supply section so as to protrude near the eye of a sewing needle. A device for interlocking a thread hooking means for passing a thread through a predetermined thread path and a threading means for inserting an upper thread transferred by the thread passing means into a stitch hole is provided, and a thread hooking threader is automatically provided. A sewing machine adapted to perform is disclosed.

The sewing machine according to the conventional example includes a base tension device as a tension applying member for applying tension to the upper thread reaching the ceiling during sewing. The base tension device includes two plate-shaped members, a spring for urging one member to press the other member, and a means for opening the two members in opposition to the urging force of the spring. In operation, tension is applied by clamping the upper thread between the two members. In threading, it is necessary to pass the upper thread through this base tension device. This base tension device has an effect of stabilizing the upper yarn in the yarn path by applying tension to the upper yarn when the yarn is hooked.

Further, the above-mentioned sewing machine is provided with a needle thread feeding device having a feeding roller and an auxiliary stitcher, and a predetermined amount of upper thread is automatically fed by the needle thread feeding device at the time of sewing. When threading, it is necessary to pass the upper thread through the needle thread feeding device.However, when threading is performed, if the feeding roller and the auxiliary roller remain in contact, the upper thread may be passed between them. Can not. Therefore, when using the automatic threading device, control is performed so that the feeding roller and the auxiliary roller are automatically separated. It is.

In addition, when the sewn material is taken out from under the presser foot, if the feeding roller and the auxiliary roller remain in contact with each other, the upper thread is pulled when the material is pulled out, making it difficult to take out the material. For this reason, the feeding roller and the auxiliary roller are separated from each other in accordance with the operation of raising the presser foot to take out the material.

In addition, when the thread is manually threaded without using the automatic thread threading device, the upper thread cannot be inserted when the feeding roller of the upper thread feeding device is in contact with the auxiliary opening roller. . Then, when manually threading, raise the presser foot lifting lever to raise the auxiliary opening roller from the feed roller, and then manually move the upper thread along the guide groove formed in the sewing machine cover. By doing so, the upper thread is hooked.

However, in the conventional sewing machine, since the base tension device is not linked with the upper thread hooking device, the upper thread may not enter between the two members of the base tension during automatic thread hooking.

Also, since the feeding device is located inside the sewing machine and the state of the catching roller cannot be checked from the guide groove formed in the sewing machine cover, do not raise the presser foot lifting lever when manually threading. However, if the thread is manually threaded, the upper thread cannot be reliably threaded over the needle thread feeder, and if the operator drives the sewing machine without noticing, stitch formation will not be possible. Inadvertently leaving the needle after needle drop on the fabric, the product may be damaged, and the thread may become entangled, requiring a complicated operation to unravel the thread or causing a failure of the device. Was. SUMMARY OF THE INVENTION An object of the present invention is to provide a sewing machine that can reliably prevent threading when the threading is inappropriate, and can reliably perform the threading operation during automatic threading. Disclosure of the invention According to one aspect of the present invention, there is provided a thread transfer means for transferring an upper thread drawn from a thread sesame to a vicinity of a sewing needle, and the thread transfer means transfers the upper thread. At this time, in a sewing machine in which the upper thread is threaded on a predetermined thread path, a regulating member for covering the thread path and a means for removing the covering of the thread path by the regulating member are provided. Features.

According to another aspect of the present invention, a thread transfer means for transferring an upper thread pulled out from a thread sesame to a position near a sewing needle, and a thread hook on a predetermined thread path when the thread transfer means transfers the upper thread. A sewing machine provided with a thread hooking means for preventing the thread from entering the predetermined thread path, and a means for releasing the blocking by the regulation member when the yarn transfer means transfers the upper thread. It is characterized by.

According to still another aspect of the present invention, in a sewing machine provided with a means for transferring an upper thread pulled out from a thread sesame to a vicinity of a sewing needle, a cover for covering a surface portion is opened and closed, and the cover is used for manual threading. The upper thread can be guided along the guide groove between the surface exposed when the fabric is opened and the front panel. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a perspective view of an embodiment of a sewing machine according to the present invention.

FIG. 2 is a plan view of the yarn hooking means shown in FIG.

FIG. 3 is a plan view showing a state in which the stepping damper and the threading drive gear are not linked with each other with respect to a part of the configuration of the threading means shown in FIG.

FIG. 4 is a plan view showing a state in which a stepping motor and a threading drive gear are linked with each other with respect to a partial configuration of the threading means shown in FIG.

FIG. 5 is a front view of the drive mechanism of the thread connecting means.

FIG. 6 is a left side view of a partial configuration of the thread hooking device in a standby state.

FIG. 7 is a left side view showing a partial configuration of the thread hooking device in an operating state. FIG. 8 is a left side view showing a state in which the regulating member is lowered from the upper surface of the face plate. is there.

FIG. 9 is a left side view showing the auxiliary roller arm in the operating state.

FIG. 10 is a left side view showing the auxiliary roller arm in a separated state.

FIG. 11 is a front view for explaining the relationship between the presser lifting lever, the presser lifting link, and the auxiliary roller arm.

FIG. 12 is a rear view of the switching operation plate, the switching cam, and the floating base tension of the sewing machine of FIG.

FIG. 13 is a rear view of the switching operation plate, the switching cam, and the floating base tension of the sewing machine of FIG.

FIG. 14 is a rear view of the switching operation plate, the switching cam, and the floating base tension of the sewing machine of FIG.

FIG. 15 is a left side view of the drive mechanism of the base tension device of the sewing machine of FIG. FIG. 16 is an external perspective view of the sewing machine with the face cover open.

FIG. 17 is an external perspective view of the sewing machine with the face cover closed.

FIG. 18 is a block diagram of a control system of the sewing machine of FIG. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Hereinafter, an embodiment of a sewing machine according to the present invention will be described with reference to FIGS. The head of the sewing machine is provided with a thread passing means A having a thread passing function, a thread passing means B having a thread passing function, and a feeding thread hooking means C having a feeding function and a thread hooking function.

The thread transfer function is to transfer the upper thread drawn from the upper thread supply section so as to protrude near the eye of the sewing needle. The threading function is to sew the upper thread transferred by the thread transfer operation. It is intended to pass through the eye. These thread passing means and thread passing means are disclosed in Japanese Patent Application Laid-Open Publication No. Hei 11-235491, and It has the same structure as the art.

Regarding the thread hooking means C, first, in FIGS. 3 and 4, the motor gear 2 fixed to the drive shaft of the stepping motor 1 for thread feeding is engaged with the drive gear 3. The drive gear 3 does not rotate because the shaft 3b is slidably fitted to the roller shaft 5 and the pin 6 provided on the roller shaft 5 is engaged with the long hole 3d provided in the shaft 3b. Like that. The feeding roller 4 is fixed to the tip of the roller shaft 5. A stopper 3c is formed on the outer periphery of the shaft 3b, and a compression spring 9 is disposed between the stopper 3c and the gear 3d. A forked portion 7a provided at one end of the switching plate 7 is fitted to the shaft portion 3b between the compression spring 9 and the stopper portion 3c.

The driven gear 15 fixed to one end of the roller shaft 5 has a claw 15a on the end face facing the drive gear 3, and the drive gear 3 has a claw 3a on the end face facing the driven gear 15 similarly. Is provided. The pawl 3a of the driving gear 3 and the pawl 15a of the driven gear 15 can engage with each other, so that when engaged, the rotation of the driving gear 3 is transmitted to the driven gear 15 .

The switching plate 7 is rotatably supported by a sewing machine frame (not shown) via a shaft 7c in the vicinity of the central portion thereof, and has a hole 7b formed at the other end thereof. Is biased in a direction (clockwise) in which the forked portion 7a is pushed toward the feed roller 4 side.

A switching arm 27 b of a switching operation plate 27, which will be described later, is inserted into the hole 7 b, and the operation of the switching operation plate 27 causes the switching plate 7 to rotate about the shaft 7 c, thereby driving the driving gear 3. Is moved on the roller shaft 5 in the axial direction, and the driving gear 3, that is, the stepping motor 1 and the driven gear 15 are connected as shown in FIG. 4 and connected as shown in FIGS. 2 and 3. Switch between no state.

The driven gear 15 is connected to a substantially semicircular working gear 17 via an intermediate gear 16. The intermediate gear 16 is a large-diameter gear part 16a that engages the driven gear 15 and the operating gear 1. And a small-diameter gear portion 16 b engaged with the gear 7.

The operating gear 17 is fixed to one end of the arm 17 A by the support shaft 17 a and rotatably supported by the sewing machine frame, and the other end of the arm 17 A rotates to one end of the link arm 18. The other end of the link arm 18 is rotatably supported by the thread hook 19. The thread hook 19 is attached to the machine frame at one end so as to be rotatable about a support shaft 19c.

When the intermediate gear 16 rotates from the state shown in Fig. 6, the operating gear 17 follows and the spindle 1

The arm 1 7A, which is integral with the operating gear 1 し, rotates counterclockwise in Fig. 6, and the link arm 18 is pulled to the right in Fig. 6.

The thread hook 19 rotates around the support shaft 19c by the above-described movements of the operating gear 17 and the link arm 18, and the tip 19a follows the shape of the upper surface 20a of the face plate 20. In this way, it moves by passing between the feeder roller 4 and the auxiliary rollers 10 and 11 opposed thereto and reaches the state shown in FIG. The thread hook 19 is urged counterclockwise in FIG. 6 by a torsion spring 73.

At the bottom of the face plate 20, a notch 20c that opens downward as shown in Figs. 6 and 7 is formed, and the upper thread that has entered the notch 20c can be held. The thread take-up spring 2 protrudes the hook-shaped tip 2 1 a into the notch 20 c so that

1 is fixed.

The thread take-up spring 21 is used to prevent the needle thread from reaching the sewing needle 51 during sewing, and is housed in a thread take-up spring cover 22 fixed to the lower end of the face plate 20 (FIG. 5). I have. An elastic pile 60 is provided in the vicinity of the opening of the cutout portion 20c (the guide groove for the thread take-up spring 21).

As shown in FIG. 2, a notch 20d (FIG. 2) that opens up and down is formed on one side of the upper surface of the face plate 20. A U-shaped cross section is formed in the notch 20d. Guides 24 are fitted and fixed. In the space defined by this guide 24 and notch 20d, a regulating member 23 for preventing threading errors can be moved vertically. It is arranged on the face plate 20. As shown in FIGS. 6 and 8, the regulating member 23 has a groove 23a extending in the horizontal direction, and the guide 24 has an arc-shaped groove 24a extending in the vertical direction.

In FIGS. 2, 9 and 10, on the top of the face plate 20, a substantially U-shaped operating body 25 having both ends of the shaft portion 25A extending in parallel to the horizontal direction is provided with a cutout portion 20d. It is arranged on the opposite side, and is rotatably attached to the face plate 20 by a support shaft 25c having the same center axis as the shaft portion 25A.

The operating body 25 has an operating shaft 25 a protruding into the notch 20 d and communicating with the groove 23 a of the regulating member 23 and the groove 24 a of the guide 24. A connecting shaft 25b protruding on the opposite side to 5a and facing the lower side of the bent portion 13a of the auxiliary roller arm 13 is provided along the rotation axis thereof. The auxiliary roller arm 13 is rotatably mounted on a sewing machine frame (not shown) with a support shaft 13c.

The operating body 25 is rotationally urged by a torsion spring 26 wound around the shaft portion 25A so that the operating shaft 25a and the support shaft 25c are raised, and the operating shaft 25a is grooved. 4a, the regulating member 23 connected to the operating shaft 25a in the groove 23a is raised so as to protrude upward from the face plate 20, and the connecting shaft 25b is assisted. It is close to the bent portion 13 a of the roller arm 13.

At one end of the auxiliary roller arm 13, the mounting plate 12 is rotatably mounted by the support shaft 12 c, and the fork parts 12 a, 12 b of the mounting plate 12 are provided with auxiliary rollers 10, 11. It is rotatably mounted. A feeding port 4 penetrates between the forked portions 12a and 12b and faces the auxiliary rollers 10 and 11 respectively.

A tension spring 14 is provided between the sewing machine frame and the other end of the auxiliary roller arm 13. The auxiliary roller arm 13 is provided with a tension spring 14 so that the auxiliary rollers 10 and 11 are pressed against the feeding roller 4. 9 rotates clockwise around the support shaft 13c. Auxiliary roller arm 13 supports support shaft 13 against tension spring 14 As shown in Fig. 9, the bending part 13a pushes the operating shaft 25a of the operating body 25 downward, and the regulating member 23 moves the face plate 2 as shown in Fig. 8. 0 descends from the upper surface 20a.

As shown in Fig. 9 to Fig. 11, the auxiliary opening side arm 13 is provided with a long hole 13b, and the upper end of the press-up link 31 is inserted into this long hole 13b. The auxiliary roller arm 13 can be rotated around the support shaft 13c with the vertical movement of the raising link 31.

The lower end of the lifting link 31 is attached to the floating plate 32. The floating plate 32 is rotatably supported by a sewing machine frame (not shown) via its shaft 32c.

The presser lifting lever 3 3 is rotatably supported by the sewing machine frame via the shaft 3 3 c, and the cam 3 3 a acting on the floating plate 3 2 and the presser rod holder 3 fixed to the presser rod 3 4 3 4 There is provided a cam portion 33b that acts on the cam. A presser foot (not shown) is attached to the lower end of the presser bar 35.

In FIG. 2 and FIGS. 12 to 14, the switching operation plate 27 is rotatably mounted on a sewing machine frame (not shown) via a shaft 27 c, and a portion which comes into contact with the switching cam 28. d, an arm 27 a that contacts the auxiliary roller arm 13, and a switching arm 27 b that is inserted into a hole 7 b provided in the switching plate 7. The switching operation plate 27 is urged to the right in FIG. 2 and counterclockwise in FIG. 12 by a tension spring 8 (FIG. 2) acting on the switching plate 7.

The switching cam 28 is rotatably mounted on the sewing machine frame via a shaft 28c, and at one end thereof, a switching link 71 linked to a stepping motor 74 (FIG. 18) is mounted. ing. A tension spring 72 is attached to the other end of the switching cam 28, and the switching cam 28 is urged clockwise in FIG. 12 by the tension spring 72.

The switching cam 28 has a cam 28 a acting on the switching plate 27 and a floating member 29. A working cam 28b is formed. The floating member 29 is rotatably attached to the frame via a shaft 29c, and one end of the floating link 30 is attached to one end thereof.

Fig. 15 shows the drive mechanism of the base tension device. The other end of the floating link 30 passes through one end of the base tension dish 39. A compression spring 40 is inserted into the other end of the floating link 30 penetrating the base tension plate 39, and is prevented from falling off by an E-ring 40a. .

A base tension shaft 37 fixed to a base tension member 36 is inserted into the base tension plate 39, and a compression spring 38 is prevented from being removed from the base tension shaft 37 by an E-ring 38a. I have. The base tension plate 39 is urged toward the base tension member 36 by the compression spring 38.

In the appearance of the sewing machine shown in FIGS. 16 and 17, the front panel 41 has a start switch 48 for starting the sewing machine and a threading switch 49 for operating the automatic threading threader. Is provided.

The yarn passing means A has a configuration described in Japanese Patent Application Laid-Open No. H11-123549, and the configuration will be briefly described. 100 is a screw shaft rotatably supported by the sewing machine frame, 101 is an actuating member that is screwed to the screw shaft 100 and is capable of moving up and down in accordance with the rotation direction of the screw shaft 100. 2 is a gear for rotating the screw shaft 100 by driving a stepping motor (not shown) for thread transfer operation, 103 is a drive shaft rotatably supported by the operating member 101, 100 Reference numeral 4 denotes a gear for rotating the drive shaft 103 by driving the stepping motor 105 (FIG. 18) for thread transfer. The thread transfer body 50 is for tensioning the upper thread hooked on the thread hooking portion 50a at the tip of the thread transfer body 50 to the front surface of the sewing needle 51, and has a base end fixed to the drive shaft 103.

The threading means B has the configuration described in Japanese Patent Application Laid-Open No. H11-235491, and a description of the configuration is omitted, but the threading portion 50a of the thread transfer body 50 is provided.糸 A threading member that passes the upper thread stretched on the front of the sewing machine through the eye of the sewing needle 51 It is.

The face cover 43 is openable and closable, and when closed as shown in Fig. 17, the rear panel 45 is extended so as to extend the guide groove 53 formed between the front panel 41 and the rear panel 45. A gap is formed between the front panel cover 43 and the front panel 41, and no gap is formed between the front panel 41 and the surface cover 43. The guide groove 53 is for guiding the upper thread drawn from the thread sesame 46 to the thread hooking portion 50a of the thread transfer body 50.

Also, the face cover 43 covers the face plate 20 when closed, and the gap formed between the side face 41a of the front panel 41 and the face plate 20 when opened and the front of the yarn transfer device. (Worker side) is exposed. In this state, as will be described later, with the face cover 43 open, a gap formed between the face plate 20 and the side face 41a of the front panel 41 is formed in a thread guide groove for manually threading. This is because it is possible to eliminate troubles such as entanglement of the yarn on the yarn path and failure of the device.

FIG. 18 is a block diagram of the control system of the present embodiment. The control means 54 includes a CPU 55, a ROM 56, and a RAM 57.A start switch 48 and a threading switch 49 are connected to the input side, and a stepping motor 1 (a feeding step pin motor) is connected to the output side. ), Stepping motor 74 (switching stepping motor) Stepping motor 105 is connected via motor driving circuits 58, 59, 106, respectively.

Next, before explaining the operation at the time of performing the automatic threading threading, the state of each mechanism before the threading switch 49 is turned ON will be described. The switching link 71, the switching cam 28, The floating links 30 and the like are located as shown in FIG. Further, the switching plate 7, the drive gear 3 and the like are at the positions shown in FIG. Further, the auxiliary mouth opening arm 13 is in the state shown in FIG. 9, and the regulating member 23 is in the state shown in FIG.

That is, the switching link 71 moves to the right in FIG. Since the cam 28b is separated from the floating member 29, the floating link 30 is moving upward, and the base tension plate 39 is pushed by the compression spring 38 to contact the base tension member 36. I have.

In addition, the switching operation plate 27 rotates counterclockwise in FIG. 14 according to the shape of the cam 28 a of the switching cam 28 abutting.

As shown in FIG. 3, the switching plate 7 engaged with the switching arm 27 b is rotated clockwise by the tension spring 8, and the driving gear 3 moves in a direction away from the driven gear 15. Therefore, since the pawl 3a of the driving gear 3 is separated from the pawl 15a of the driven gear 15, the link between the stepping motor 1 and the thread hook 19 is released. Further, as shown in FIG. 9, the arm 27a of the switching operation plate 27 is separated from the auxiliary roller arm 13 so that the auxiliary roller arm 13 is rotated clockwise in FIG. As a result, the auxiliary rollers 10 and 11 are in contact with the feeding roller 4. At the same time, since the bent portion 13a of the auxiliary roller arm 13 is located above the connecting shaft 25b of the operating body 25, as shown in FIG. The upper thread protrudes upward from the upper surface 20a, and covers the thread path (thread path) through which the upper thread passes, thereby restricting (preventing) the upper thread from entering or leaving the thread path. Next, an operation of performing automatic threading threading will be described.

First, the operator pulls out the upper thread from thread thread 46 shown in Figs. 16 and 17 and guides it along guide groove 53. After passing through the top of 52 in order, finally, the yarn is hooked on the yarn hooking portion 50a of the yarn transfer body 50.

When the threading switch 49 is turned on in this state, the control by the control means 54 shown in FIG. 18 is started. That is, first, the stepping motor 74 rotates, the switching link 71 moves, and the switching cam 28 rotates until it reaches the position shown in FIG. In this position, since the cam 28 b comes into contact with the floating member 29, the floating link 30 moves downward as shown in FIG. 15 and the base tension plate 39 is compressed. The compression spring 38 is compressed by the spring 40 and the base tension member 36 and the base tension plate 39 are separated from each other.

The switching operation plate 27 rotates in the clockwise direction in FIG. 12 with the rotation of the cam 28 a of the switching cam 28. In this state, the switching arm 27 b is at the position shown in FIG. 4, the switching plate 7 rotates against the force of the tension spring 8, and the driving gear 3 is driven by the force of the compression spring 9 to operate the driven gear 1. Move in the direction of 5. Therefore, the pawl 3a of the driving gear 3 and the pawl 15a of the driven gear 15 engage with each other, and the stepping motor 1 and the thread hook 19 interlock.

Further, as shown in FIG. 10, the arm 27 a of the switching operation plate 27 pushes the auxiliary opening arm 13 to rotate about the support shaft 13 c, and as a result, the auxiliary rollers 10, 1 1 moves away from feeding roller 4.

At the same time, the bending portion 13a of the auxiliary roller arm 13 pushes the connecting shaft 25b of the operating body 25, thereby rotating the operating body 25 around the support shaft 25c. As a result, as shown in FIG. 8, the operating shaft 25a of the operating body 5 descends, and the regulating member 23 descends below the upper surface 20a of the face plate 20. Release the cover to release the upper thread from entering the thread path.

Next, when the stepping motor 105 for yarn transfer of the yarn transfer device is operated, the screw shaft 100 and the gear 104 rotate synchronously, so that the yarn transfer body 50 is moved to the yarn hooking section 5. While rotating the drive shaft 103 with the upper thread held at 0a, it descends in accordance with the lowering of the drive shaft 103, and lowers the upper thread held at the thread hooking section 50a with the sewing needle 51. To the front of the eye hole.

At this time, since the regulating member 23 is below the upper surface 20a of the face plate, the upper thread 75 near the upper surface 20a of the face plate moves on the upper surface 20a of the face plate without being caught by the regulating member 23. As a result, as shown in FIG. 8, the thread hook 19 crosses the front end 19 a of the thread hook 19. Further, as shown in FIG. 15, since the base tension member 36 and the base tension plate 39 are separated from each other, the upper thread 75 is moved toward the base tension shaft 37. To move between the base tension member 36 and the base tension plate 39.

Next, when the stepping motor 1 is driven and rotated by the control means 54, and the stepping motor overnight gear 2 is rotated, the thread hook 19 rotates the intermediate gear 16, the operating gear 17, and the link arm 18. Rotate through. Since the upper thread 75 is at the position as shown in FIG. 8, the thread hook 19 hooks the upper thread 75 by the tip 19a at the beginning of its rotation.

At the same time, under the control of the control means 54, when the stepping motor 74 is driven and rotated to move the switching link 71, the switching cam 28 is rotated to the position shown in FIG. In this position, the floating member 29 is separated from the cam 28b, so that the base tension plate 39 is pressed against the base tension member 36 by the compression spring 38, and the upper thread 75 is moved to the base tension member 36, the base tension member 36. It is sandwiched between three tension dishes 39.

Therefore, when the upper thread 75 is pulled out from the base tension member 36, tension is generated. Due to this tension, there is an effect that the yarn can be stably hooked to each part. In this way, the switching cam 28 rotates from the position shown in FIG. 12 to the position shown in FIG. 13, but the cam 28 a is formed so that the switching operation plate 27 nevertheless does not move. Therefore, the feeding roller 4 and the auxiliary rollers 10 and 11 are separated from each other, and the stepping motor 1 and the driven gear 15 are linked.

When the thread hook 19 with the upper thread hooked on the distal end 19 a further rotates, the upper thread 75 enters between the feeding roller 4 and the auxiliary rollers 10 and 11. Further, when the thread is rotated to the position shown in FIG. 7, the upper thread 75 enters the cutout portion 20c of the face plate 20, and is hooked on the hook-shaped tip portion 21a of the thread take-up spring 21.

Thereafter, the control means 54 causes the stepping motor 1 to rotate in the reverse direction. The thread hook 19 also rotates in the opposite direction, and the upper thread 75 is retained by the thread take-up spring 21. It is. Even if the thread hook 19 is rotated in the opposite direction from the position shown in FIG. 7, since the pile 60 is provided near the entrance of the notch portion 20c, the thread take-up spring in the notch portion 20c is provided. The needle thread 75 hanged on 21 is not returned together with the thread hook 19.

When the threading device performs threading of the sewing needle 51 into the eye hole, the stepping motor 74 rotates to return to the state shown in FIG. In this state, the upper thread is caught between the feeding roller 4 and the auxiliary rollers 10 and 11, and the interlock between the stepping motor 1 and the driven gear 15 is released. As described above, the threading thread is passed through the feeding section (feeding port 4, auxiliary rollers 10 and 11), thread take-up spring 21, balance 47, and needle 51, and sewing preparation is completed.

Next, the case of manually threading the thread will be described.

Manual thread hooking is performed with the face cover 43 open as shown in FIG. First, the presser foot is raised by rotating the presser foot lifting lever 33 in the direction of the arrow in FIG. At this time, the cam portion 33a comes into contact with the floating plate 32, the floating plate 32 rotates around the shaft 32c, and the presser link 31 moves downward. As a result, the auxiliary roller arm 13 rotates to separate the auxiliary port rollers 10 and 11 from the pay-out roller 4, and the upper thread can be inserted between them.

At the same time, the bending portion 13a of the auxiliary roller arm 13 pushes the connecting shaft 25b of the operating body 25, so that the operating body 25 rotates. Then, the regulating member 23 descends below the upper surface 20a of the face plate 20 via the operation shaft 25a, releases the covering of the yarn path (yarn path), and enters the upper thread into the yarn path. Unblock.

In this state, the operator pulls out the upper thread from the thread sesame 46, guides the upper thread along the guide groove 53, and from the middle, the side 4 1a (Figs. 6, 16) of the front panel 41 and the face plate. After lowering along the gap of 20 and threading the upper thread 75 from the notch 20 c of the face plate 20 c on the thread take-up spring 2 1 5 Pass the needle thread through the eyelet of 1 to finish the threading threading and complete the sewing preparation. In this embodiment, prior to manual threading and threading, If you forget to raise the presser foot by rotating the lever 33, the thread through which the upper thread passes with the regulating member 23 protruding above the upper surface 20a of the face plate 20 By covering the path (yarn path), the upper thread is restricted (prevented) from entering or leaving the yarn path. That is, since the gap formed between the face plate 20 and the side surface 41a of the front panel 4'1 is closed, the upper thread cannot pass therethrough. Therefore, at this point, the worker notices that he has forgotten to raise the presser.

Also, during manual threading, the gap between the side surface 41a of the front panel 41 and the face plate 20 formed when the face cover 43 is opened is used as a thread guide groove. There is no need to form a thread guide groove. Therefore, a beautifully shaped sewing machine can be maintained.

According to the present invention, there is provided thread transfer means for transferring the upper thread drawn from the thread sesame to the vicinity of the sewing needle, and when the thread transfer means transfers the upper thread, the upper thread is threaded on a predetermined thread path. In the above-described sewing machine, by providing a regulating member that covers the thread path and a unit that releases the covering of the thread path with the regulating member, the regulating member is used to raise the thread when manual threading cannot be performed. Since the thread cannot be inserted into the thread path, the operator does not need to carry out uncertain threading work, and there is no need to perform a work such as damaging the sewing product or untangling the thread.

A sewing machine provided with a thread transfer means for transferring the upper thread drawn from the thread sesame to the vicinity of the sewing needle; and a threading means for threading the upper thread on a predetermined thread path when the thread transfer means transfers the upper thread. In the above, a manual threading is performed by providing a regulating member for preventing entry into the predetermined yarn path, and a means for releasing the inhibition by the regulating member when the yarn transferring means transfers the upper yarn. When it is not possible, it is possible to prevent the upper thread from being inserted into the thread path by the regulating member, and to perform the automatic threading by manually operating the presser lifting means etc. Components There is no need to release, and threading can be performed reliably. Industrial applicability

INDUSTRIAL APPLICABILITY The present invention is suitable for use in a sewing machine in which an upper thread from a thread spool is automatically threaded in a thread path to a needle and then threaded through a thread hole of the needle.

Claims

The scope of the claims

1. A sewing machine provided with thread transfer means for transferring the upper thread drawn from the thread sesame to the vicinity of the sewing needle, so that the upper thread is threaded on a predetermined thread path when the thread transfer means transfers the upper thread. At

A regulating member that covers the yarn path;

A sewing machine, comprising: means for releasing the covering of the thread path by the regulating member.

2. Thread transfer means for transferring the upper thread drawn from the thread sesame to the vicinity of the sewing needle, and threading means for threading the upper thread on a predetermined thread path when the thread transfer means transfers the upper thread. In the sewing machine,

A regulating member for preventing entry into the predetermined yarn path;

A sewing machine provided with a means for releasing the restriction by the regulating member when the thread transfer means transfers the upper thread.

3. The sewing machine according to claim 2, wherein the releasing means performs a releasing operation in conjunction with an operation of the press-up means.

4. The micom according to claim 2, wherein the releasing means performs a releasing operation in conjunction with an operation of the yarn passing means or the yarn hooking means.