JP4272041B2 - Sewing machine threading device. - Google Patents

Description

  The present invention is located in a stage before the thread supplied from the sewing machine main body passes through the hole of the needle, and allows the thread to be easily and quickly inserted into a thread hook for supplying the thread in a stable state. The present invention relates to a threading device for a sewing machine capable of

  Many inventions related to threading devices for needle holes have been made. For example, the following mechanism is basically used. There is a mechanism in which the threading rod descends and rotates at the position of the needle hole. When the threading lever is lowered, the threading rod pushed by the threading lever descends and stops descending at the stopper position, that is, the needle hole position. Further, when the threading lever is lowered, the threading bar is rotated at the needle hole position by the cam that converts the lowering operation of the threading lever into the rotation operation of the threading bar. By this movement, the threading hook is inserted into the needle hole from the rear side to the front side of the needle, and the thread is hooked on the threading hook protruding from the needle hole manually.

After that, by releasing or raising the operation of the threading lever, the threading hook is first retracted to the rear side of the needle and the threading rod is further raised, so that the thread is passed through the needle hole of the needle. To complete. However, the needle bar to which the needle is fixed is usually provided with a thread hook for guiding the thread while it reaches the needle hole. In many cases, the thread hooking section is manually performed separately from the above-described threading device for threading the thread through the needle hole. However, it is quite troublesome to hang the thread on the thread hook, or the thread hook may be forgotten. An example of an apparatus for solving such a problem is disclosed in Patent Document 1 below.
Japanese Patent Laid-Open No. 9-192381

  However, the structure of the invention described in Patent Document 1 is extremely complicated. Moreover, the number of parts constituting the invention according to Patent Document 1 is large and the shape is complicated. In such an apparatus, high accuracy is required for assembling, and in terms of durability, it is difficult to ensure what is structurally satisfactory. A problem (technical problem or object) to be solved by the present invention is to allow a thread to be hung on a thread hook by an extremely simple operation and to have a very simple structure.

  Accordingly, as a result of earnest and research to solve the above-mentioned problems, the present invention is based on the invention of claim 1, wherein a needle bar that moves up and down while holding a needle having a needle hole at the lower end, and a sliding needle bar A needle bar support that can be supported and swings in a direction perpendicular to the cloth feed direction, a needle bar threading portion located at the lower end of the needle bar, and a threading unit on the swing free end side of the swing center. A threading device having a needle hole threading portion having a hook; a threading rod having the threading device at a lower end; and an operation member for moving the threading rod up and down and rotating the operation member. In the threading device of the sewing machine for threading the upper thread through the needle hole, the threading tool is provided with a thread hook, and the needle thread is threaded onto the needle bar thread hanging portion from the back side of the sewing machine main body. An insertion port is provided so that the thread can be inserted toward the side, and the thread hook on which the upper thread is hung is lowered. By the upper yarn is a sewing machine threading device characterized by comprising moving such that it enters toward the insertion opening of the needle bar thread hook which is open to the rear, the above-mentioned problems are eliminated.

  Further, in the present invention, a needle bar that moves up and down while holding a needle having a needle hole at the lower end, and a needle bar support that supports the needle bar to be slidable and swings in a direction perpendicular to the cloth feeding direction. A needle bar threading portion located at the lower end of the needle bar, a threading tool having a threading hook, a threading bar equipped with the threading tool at the lower end, and moving and rotating the threading bar up and down. A sewing machine threading device for threading the upper thread through the needle hole by operating the operating member, wherein the thread hook provided on the threading tool is in the up-and-down motion region of the upper thread. An outer edge that can be threaded to guide the rear position is provided, and the outer edge is guided by lowering and rotating the threading of the threading rod by the operation of the operating member on which the upper thread is hung. Further, the upper thread enters the inside of the thread hook from the insertion opening opened to the rear of the needle bar thread hook. It is moved by the sewing machine of the threading device according to claim as, the above-mentioned problems are eliminated.

  In the present invention, a needle bar that moves up and down while holding a needle having a needle hole at the lower end, a needle bar support that slidably supports the needle bar and swings in a direction perpendicular to the cloth feed direction, A threading rod provided with a threading tool that is supported by the needle bar support so as to move up and down and rotate behind the needle bar, and has a needle hole threading portion having a threading hook at the lower end, and the needle bar A needle bar thread hooking portion that is provided at the lower end of the needle hole and opens rearward to guide the needle thread so that the upper thread can be inserted into the needle hole, and an operating member that moves the threading bar up and down. In a threading device for a sewing machine, wherein the threading hook is protruded and retracted into and out of the needle hole by operating the operating member, and the upper thread is threaded through the needle hole. A thread hook that holds one end of the upper thread between the swinging center portion that is the rotation center of the thread and the threading hook An upper position guide portion is formed between the thread hook and the threading hook, and the upper thread is guided from the front side of the upper position guide portion to the back side of the thread hook, and the thread hook is lowered. The needle thread threading device is characterized in that the upper thread is made to enter the needle bar threading part from an insertion port opened rearward of the needle bar threading part. Is a solution.

  Furthermore, in the above-described configuration, the thread hook is a sewing machine threading device formed in a substantially plate shape, thereby solving the above-described problems. In the above-described structure, the lower end edge of the thread hook is a threading device for a sewing machine formed so as to be inclined downward from the swinging free end side toward the swinging center side. The problem is solved.

  According to the present invention, the threading operation at the yarn hooking portion can be performed easily and quickly together with the threading operation through the needle hole. Also, the structure of the present invention is very simple and does not interfere with other devices. Moreover, the threading operation can be performed reliably. Further, by forming the lower end edge of the threading guide portion so as to be inclined downward from the swinging free end side toward the swinging center side, the upper thread can be guided to the upper position guide unit, The work efficiency is improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The configuration of the present invention mainly comprises a threading shaft member A, a fixed guide member B, an operation member C and the like as shown in FIGS. These are mainly mounted on the needle bar support 1. The needle bar support 1 is mounted in the sewing machine main body so as to slidably support the needle bar and swing in a direction orthogonal to the cloth feeding direction. The needle bar support 1 is mounted with a threading shaft member A, a fixed guide member B, a needle bar 16 and the like which will be described later. The needle bar support 1 is formed with two mounting support portions 1a in the vertical direction for slidably supporting the threading rod 2 of the threading shaft member A.

  A needle bar thread hook 20 is attached to the lower end of the needle bar 16. The needle bar thread hooking portion 20 is provided on a needle stop portion 19 having a substantially cubic block shape attached to the lower end of the needle bar 16. Specifically, a member formed by appropriately bending a band plate, a bar-like metal, a synthetic resin material, or the like is fixed through corners on the outer periphery of the needle stopper 19. The needle bar thread hooking portion 20 is formed in a substantially frame shape, and is open on the rear side of the sewing machine main body, and this portion serves as an insertion port 20a. The inside of the needle bar thread hook portion 20 is referred to as a thread hook inner portion 20b. The upper thread n can enter the thread hooking interior 20b from the insertion port 20a.

The threading shaft member A, as shown in FIG. 2 (c), threading bar 2, and a guide pin 3 and threading tool A ₁ Tokyo. The guide pin 3 penetrates and is fixed at an appropriate right angle at an appropriate position in the axial direction of the threading rod 2, and both shaft ends of the guide pin 3 protrude outward from the diameter direction of the threading rod 2. Yes. Further, the guide pin 3 is mounted from the upper side of the threading rod 2 at a position about 1/3 of its axial length. The guide pin 3 is moved up and down via a movable guide portion 9 of the operation member C, which will be described later, and the threading rod 2 moves up and down together with the guide pin 3.

Next, the threading device A ₁ is FIG. 3 (a), as shown in FIG. 5 or the like, mainly needle hole threader portion 4, and a yarn hooking 5. First, the needle hole threading portion 4 is formed of a swing arm portion 4a, a threading hook 4b, a swing center portion 4c, and the like. The needle hole threading portion 4 is fixed to the lower end of the threading rod 2 via the swing center portion 4c, and the swing center portion 4c is formed in a substantially cylindrical shape and is diametrically oriented. The threading rod 2 is inserted into the center of the thread and fixed by a pin or the like so as not to idle (see FIG. 2C).

  The threading hook 4b is provided at a position on the swinging free end side of the swinging arm portion 4a. The threading hook 4b has a hook shape and is large enough to be loosely inserted into the needle hole 17a of the needle 17. As shown in FIG. 4, the swinging free end means a side swinging on a horizontal plane with the swinging center portion 4c as the swinging center. Needle guides 4d, 4d are formed on both sides of the threading hook 4b in the swing arm 4a, and when the swing free end of the swing arm 4a is brought close to the needle 17, The needle guides 4d and 4d guide the needle hole 17a of the needle 17 to the threading hook 4b so as to surround both side portions of the needle 17.

Next, the yarn hooking 5 constituting the threading tool A ₁ is FIG. 3 (a), as shown in FIG. 5 or the like, is integrally formed on the swing arm portions 4a. The thread hook 5 is formed in a plate shape having an appropriate thickness, and is formed in a trapezoidal shape in which both side edges in the width direction are substantially parallel and the lower edge is inclined. Moreover, the yarn hooking 5 has a needle thread movement guide walls 5a, referred to the front side of the upper yarn movement guide wall 5a and the front portion 5a _1. Also referred to as the back side of the yarn hooking 5 and the rear portion 5a _2. At both side edges in the width direction of the thread hook 5, the vertical dimension of the outer end edge 5c positioned on the swing free side is shorter than the vertical dimension of the inner end edge 5d positioned on the swing center side. Has been. The lower end edge 5e of the thread hook 5 is formed to be inclined downward from the swinging free end side toward the swinging center side.

Further, the back surface portion 5a ₂ of the thread hook 5 is structured to be inclined at an appropriate angle θ with respect to the longitudinal direction of the swing arm portion 4a. That is, the back surface portion 5a ₂ is formed on an inclined surface on a vertical plane. Specifically, the back surface portion 5a ₂ on the swing free end side of the swing arm portion 4a is rear side of the arm portion 4a and is formed on substantially the same plane, are formed so as to protrude to the front side spaced from the swing arm portion 4a toward the swing center portion 4c side of the rear portion 5a ₂ Yes.

A thread holding convex portion 5f is formed on the back surface portion 5a ₂ and at the lower end edge 5e. The yarn holding projection 5f, as shown in FIG. 5 (a), (b) , are bulged formed from the rear portion 5a ₂ toward the outside and along the longitudinal direction of the lower edge 5e Although formed, it is formed so that the amount of bulging gradually increases from the swing center side toward the swing free end side. Further, it is preferable that a smooth arcuate surface and the thread holding projection 5f and the rear portion 5a _2. As a result, the thread holding convex portion 5 f has fewer sharp parts so that the upper thread n can be smoothly separated from the thread hook 5. Further, since the lower end edge 5e is formed to be inclined upward on the swing free end side, as shown in FIG. 7, the upper thread n is hung on the lower end edge 5e and pulled to the swing free end side as it is. Only the upper thread n can be locked to the upper position guide portion 5g. The upper position guide portion 5g is a substantially gate-shaped portion surrounded by the outer end edge 5c, the swing arm portion 4a, and the needle guide 4d closer to the swing center portion 4c. The upper position guide portion 5g is opened portion is positioned on the lower side, the upper yarn n is made to be able to pass through the rear portion 5a ₂ enters the upper position guiding portion 5g than its opening.

Further, as described above, by making the back surface portion 5a ₂ as an inclined surface, the upper thread n that has passed through the back surface portion 5a ₂ from the swinging free end side is again transferred to the thread hook 5 from the swinging center portion 4c side. The operation of pulling out to the front surface 5a ₁ side can be facilitated, and the upper thread n is guided along the back surface 5a ₂ so that an excessive load is not applied to the upper thread n. It is something that can be done. As shown in FIG. 8A, the second type of the thread hook 5 is formed of a shaft member 5h formed along the vertical direction, and the swinging center portion 4c from the lower end of the shaft member 5h. A guide shaft 5j is formed toward the side, and the shaft member 5h and the guide shaft 5j form a substantially L shape. An upper position guide portion 5g is formed between the shaft member 5h and the inner needle guide 4d. Further, as a third type of the thread hook 5, as shown in FIG. 8B, there is one constituted only by the shaft member 5h.

Wherein the guide pins 3, and the swinging arm portion 4a of the threading tool A _1, are respectively mounted at a predetermined angle. The angle formed by the guide pin 3 and the swing arm 4a is determined by the rotation angle of the threading rod 2 determined by the guide groove 7 and the guide pin 3 of the fixed guide member B described later. . An elastic member 25 is attached to the threading rod 2, and between the guide pin 3 on which the elastic member 25 is fixed to the threading rod 2 and the mounting support portion 1 a on the lower side of the needle bar support 1. It is attached. The elastic member 25 always elastically biases the threading rod 2 upward. That is, the threading tool A ₁ fixed to the lower end of the threading bar 2 is normally positioned above.

  Next, as shown in FIGS. 2A and 2B, the fixed guide member B is a guide plate 6 having a guide groove 7 formed therein. The guide groove 7 includes a first region in which one of the guide pins 3 of the threading shaft member A is inserted, the guide pin 3 moves along the guide groove 7 and moves in the vertical direction, and the region. At the end, a second region is provided in which the threading rod 2 rotates in the axial direction. The guide groove 7 is formed continuously from above by forming a vertical groove 7a, an angle shift groove 7b, and a set groove 7c. In the vertical groove 7a, the guide pin 3 moves up and down in a non-rotating state in the horizontal direction. Next, in the angle transition groove 7b, the guide pin 3 takes charge of the first region by moving in the vertical direction while rotating in the horizontal direction.

The angle transition groove 7b forms a slight inclination angle with respect to the vertical groove 7a, and the threading hook 4b at the time of lowering forms an operation of avoiding other mechanical parts. Also, the set groove 7c, those in charge of the second region for rotating the threading tool A ₁ of the threading shaft member A to a predetermined position via the guide pin 3. In the guide groove 7, the threading rod 2 is rotated by the inserted guide pin 3, and the threading hook 4 b of the swinging arm portion 4 a of the threading device A ₁ is connected to the lower end of the needle bar 16 via the needle stopper 19. In this case, the needle 17 is moved toward the needle hole 17a. The guide pin 3 starts to rotate in the horizontal direction by the angle shift groove 7b, and the threading hook 4b is inserted into the needle hole 17a by the set groove 7c.

  That is, as shown in FIGS. 2A and 2B, the angle transition groove 7b is formed in a slightly inclined state with respect to the vertical groove 7a, and is a guide pin attached to the threading rod 2. 3 rotates when it moves in the up-down direction along the angle transition groove 7b in the inclined shape. The rotation of the guide pin 3 is transmitted to the threading rod 2, the threading rod 2 is rotated, and the swinging arm portion 4 a is rotated together with the threading rod 2. The set groove 7c is a groove that exists at the lower end of the angle shift groove 7b and expands along the inclination direction from the lower end of the angle shift groove 7b.

As shown in FIG. 2B, a positioning member 13 is mounted on the needle bar 16 (or needle bar support 1). The positioning member 13, when the threading tool A ₁ reaches the needle hole 17a position of the needle bar 16 to be mounted needle 17, the guide pin 3 abuts to stop the descent of the threading bar 2, It serves to rotate the threading rod 2 in the axial direction. The positioning member 13 has a substantially vertical plate shape, and is attached to a stop projection 13a that the guide pin 3 contacts when the guide pin 3 is lowered, a holding groove 13b into which the guide pin 3 is loosely inserted, and a needle bar 16. And a connecting portion 13c. From the stop protrusion 13a to the inside of the holding groove 13b, it continues substantially horizontally.

  The stop projection piece 13a and the holding groove 13b of the positioning member 13 determine a position where the threading hook 4b can enter the needle hole 17a, and at the time of the retracting operation of the threading hook 4b into the needle hole 17a, the guide pin 3 This suppresses the vertical movement and prevents breakage of the threading hook 4b, the needle 17, and the like. The connecting portion 13c of the positioning member 13 is fixed at an appropriate position in the axial direction of the needle bar 16 so that the lowering stop position of the guide pin 3 can correspond to the change in the height of the needle hole 17a. Can be fixed via a fixing tool such as a screw.

  Next, the operation member C is attached to the fixed guide member B so as to be movable in the vertical direction. The operation member C includes a movable base portion 8, a movable guide portion 9, a guided groove 10, and an operation lever portion 11. The movable base portion 8 is formed with a shaft hole 8a through which the threading rod 2 is inserted, and the movable base portion 8 is pivotally supported by the threading rod 2 through the shaft hole 8a.

  Further, as shown in FIGS. 1, 2, etc., the operation member C has a movable guide portion 9 integrally formed adjacent to the movable base portion 8. A guided groove 10 is formed between the movable base portion 8 and the movable guide portion 9. The guided groove 10 is a portion into which the guide plate 6 of the fixed guide member B is inserted, and constitutes a guide when the operation member C moves up and down. The threading rod 2 is inserted into the shaft hole 8 a of the movable base portion 8, the movable base portion 8 is connected to the threading shaft member A, and the elastic member 25 is disposed directly below the movable base portion 8. The movable base portion 8 is biased upward.

  That is, as shown in FIG. 1, the threading rod 2 is inserted into the coil spring type elastic member 25, and the upper end of the elastic member 25 is in contact with the movable base portion 8. The lower end of the arm is in contact with the mounting support portion 1a below the needle bar support 1, and always presses the movable base portion 8 upward, and the movable guide portion 9 is also pressed upward together with the movable base portion 8. . Then, the threading shaft member A is urged upward together with the guide pin 3 through the movable guide portion 9, and is maintained at the upper position.

  Further, as shown in FIG. 2 (c), the movable guide portion 9 is formed with a long hole portion 9a. The guide pin 3 is inserted into the long hole portion 9a, and the guide pin 3 is moved in the vertical direction. In addition, the threading shaft member A is moved in the vertical direction. The long hole portion 9a is inclined at an appropriate angle. The inclination angle of the long hole portion 9a is specifically about 45 degrees, but is not limited to this value and may be set appropriately. The inclination direction of the long hole portion 9a is opposite to the inclination direction of the angle transition groove 7b of the guide groove 7.

  The long hole portion 9a is formed in an inclined shape in the direction opposite to the inclination direction of the angle transition groove 7b, so that when the long hole portion 9a descends the region of the angle change groove 7b, the horizontal direction of the guide pin 3 is increased. It serves to adjust the rotational speed in the direction appropriately. The rotation speed of the guide pin 3 becomes slower when the inclination of the long hole portion 9a is large, and becomes faster when the inclination is small. That is, the rotational speed of the threading rod 2 and the swing plate 4a is determined by the inclination angle of the long hole portion 9a. Moreover, although the elongate hole part 9a is not specifically illustrated, the Example formed in the substantially horizontal shape also exists. In addition, when this long hole part 9a is substantially horizontal shape, the rotational speed of the guide pin 3 becomes the fastest.

  As shown in FIGS. 2A and 2C, the operation lever portion 11 includes an operation photographing portion 11a and a shaft flange portion 11b. The shaft flange portion 11b is a portion formed vertically from the lower end of the movable base portion 8, and an operation photographing portion 11a is formed at the lower end of the shaft flange portion 11b. The operation photographing unit 11a is pressed by an operator's fingertip to cause the threading shaft member A to perform a threading descending step. The operation member C is mounted on the fixed guide member B so as to be movable up and down. First, the guide plate 6 of the fixed guide member B is inserted into the guided groove 10 of the operation member C.

Next, threading and threading operations will be described. First, the needle thread n supplied from the sewing machine main body to the yarn hooking 5 of the threading tool A _1, as shown in FIG. 6 (a), (b) , the yarn hooking 5 from the front side of the swing arm portion 4a The back portion 5a ₂ is passed through and pulled out to the front portion 5a ₁ of the thread hook 5 again. At this time, one end of the upper thread n is picked by hand and is kept in a slight tension state. Then, as shown in FIG. 6C, the guide groove 7 of the fixed guide member B and the movable guide portion 9 of the operation lever portion 11 are lowered by lowering the operation lever portion 11 via the operation photographing portion 11a. Then, the guide pin 3 pushed down is lowered, and the threading tool A ₁ is lowered together with the threading rod 2.

When the guide pin 3 is locked by the threading positioning member 13, the descending of the threading rod 2 is stopped. In this case the threading device A ₁ is oscillating arms 4a is swung in a horizontal plane with the rotation of the threading bar 2, as shown in FIG. 6 (d), the upper yarn n is the needle It gradually approaches the insertion port 20a of the bar thread hook portion 20.

Further, when lowering the operating lever unit 11, the threading bar 2 is rotated downward and through the guide pin 3 guided by the long hole portion 9a of the movable guide portion 9, the threading device A ₁ is rocking The moving arm portion 4 a rotates, and the upper thread n enters from the insertion port 20 a of the needle bar thread hook portion 20 and the upper thread n is received in the thread hook inner portion 20 b of the needle bar thread hook portion 20. The threading hook 4b attached to the swing arm 4a is set to be positioned at the height of the needle hole 17a of the needle 17, and is loosely inserted into the needle hole 17a of the needle 17.

  Next, by hooking one end of the upper thread n from the opposite side of the needle hole 17a to the threading hook 4b and releasing the operation shooting portion 11a, the swing arm portion 4a is swung in the opposite direction. Then, when the threading hook 4b is separated from the needle hole 17a, the upper thread n is inserted into the needle hole 17a. Further, the upper thread n is maintained in a state of being inserted through the needle bar thread hooking portion 20.

Further, when withdrawing the hooks 4b threading to release the operation lever portion 11 from the needle hole 17a, the threading device A ₁ is raised, the upper thread n is the outer edge from the inner edge 5d of the thread holding projection 5f It gradually comes off toward the 5c side. At this time, since the thread holding convex portion 5f gradually disappears from the outer end edge 5c toward the inner end edge 5d, the upper thread n gradually disengages from the outer end edge 5d toward the inner end edge 5c. n can be smoothly removed from the yarn holding convex portion 5f. Thus, once the rising needle thread n which fits the needle bar thread hooking portion 20 of the threading device A _1, do not depart from the needle bar thread hook 20.

The present invention, in the threading device A ₁ is holding one end of the upper yarn n between the needle hole threader portion 4 of the rotation center and becomes swing center portion 4c and the threading hook 4b A thread hook 5 is formed, an upper position guide portion 5g is formed between the thread hook 5 and the threading hook 4b, and the upper thread n passes from the front side of the upper position guide portion 5g to the back side of the thread hook 5 When the thread hook 5 is lowered, the upper thread n is made to enter the thread hook inside 20b from the push-through opening 20a opened to the rear of the needle bar thread hook portion 20. In the process of lowering C and threading the upper thread n through the needle hole 17a, the threading operation at the threading section can be performed easily and quickly. Moreover, since it can be performed together with threading, it is possible to prevent forgetting threading. Further, the thread hook is formed in a substantially plate shape, so that the structure can be made very simple. Further, the lower end edge 5e of the threading guide portion 5 is formed so as to be inclined downward from the swinging free end side toward the swinging center side, and the end edge has a thread holding convex portion along the tilting direction. Since the threading device for the sewing machine in which 5f is formed, the inclined upper end of the inclined lower end edge 5e faces the upper position guide portion 5g, and the upper thread n is moved to the lower end edge 5e in the threading operation. By folding back at any position and pulling the upper thread n upward, the upper thread n moves to the upper position guide part 5g along the inclined end edge, and the upper thread n is very easily moved to the upper position guide part 5g. Can be guided to. Thus, the operator simply turns the upper thread n back to any position of the lower end edge 5e and moves it while applying tension in the direction of the upper position guide 5g, so that the upper thread n is locked to the upper position guide 5g. In particular, it does not take time to guide and guide the upper thread n to the upper position guide portion 5g, and the working efficiency can be further improved.

  Next, according to the present invention, the thread holding convex portion 5f that disposes the upper thread n in front of the needle hole for threading by the thread holding portion that holds one end of the upper thread n and the thread guide on the threading hook 4b side. The thread hook 5 is arranged so as to move up and down close to the needle bar thread hook portion 20, and the upper thread n is maintained by the upper position guide portion 5 g of the yarn hook 5, and the yarn hook 5 is lowered. Thus, the upper thread n enters the thread hooking portion of the needle bar thread hooking portion 20 from the insertion port 20a opened to the rear of the needle bar thread hooking portion 20.

  That is, as an invention, the present embodiment is one of them, and, in addition, the “thread hook 5” may be a simple rod-like one provided with the “upper position guide portion 5g”. In this case, the threading member can be combined with known “threading”. The shape of the inclined portion below the “thread hook 5” is a guide shape of the upper thread n at the time of thread hanging, and guides the upper thread n into the groove of the “upper position guide portion 5g”. The operator can guide the upper thread n without aiming and guiding the upper thread n in the groove direction.

It is a front view which shows the structure of the threading device of this invention. (A) is a perspective view which shows the structure of this invention, (b) is an exploded perspective view which shows a needle bar support body and a fixed guide member, (c) is an exploded perspective view of an operation member and a threading tool. (A) is a perspective view of a threading tool, (b) is a perspective view of essential parts of a needle bar and a thread hooking portion. It is the top view made into the partial cross section which shows the positional relationship of a threading tool and a thread hook part. (A) is a front view of a threading tool, (b) is a longitudinal sectional side view of the main part of (a). (A) is a perspective view of a state where an upper thread is wound around a thread hook, (b) is a front view of (a), (c) is a perspective view of a state where the upper thread is hooked on a thread hook, and (d) is an operation. FIG. 4E is a perspective view of a state in which the member is lowered and the upper thread moves toward the insertion port of the thread hooking portion, and FIG. 5E is a perspective view of a state in which the upper thread is hooked on a threading hook inserted into the needle hole. It is an effect | action figure which shows the thread | yarn guide to the upper position guide part of the thread hook lower end edge in this invention. (A) is a perspective view of a second type of thread hook, and (b) is a front view of a third type of thread hook.

Explanation of symbols

A ₁ ... Threading tool C ... Operation member n ... Upper thread 1 ... Needle bar support 2 ... Threading bar 4a ... Oscillating arm part 4b ... Threading hook 5 ... Thread hook 5a ₁ ... Front part 5a ₂ ... Back part 5c ... Outer edge 5d ... Inner edge 5e ... Lower edge 5f ... Thread holding convex part 5g ... Upper position guide part 16 ... Needle bar 17 ... Needle 17a ... Needle hole 20 ... Thread hook part 20a ... Insertion port

Claims (5)

A needle bar moving up and down while holding the needle having a needle hole at the lower end, slidably supports the needle bar, a needle bar supporting member that swings in a direction orthogonal to the cloth feeding direction, of the needle bar A needle bar threading portion located at the lower end, a threading tool having a needle hole threading section having a threading hook on the swinging free end side of the swinging center part, and a thread having the threading tool at the lower end In a threading device for a sewing machine comprising a threading bar and an operating member for moving the threading bar up and down and rotating, and threading an upper thread through a needle hole by operating the operating member.
The threader is provided with a thread hook, and the needle bar thread hook is provided with an insertion port so that the upper thread can be inserted from the back side to the front side of the sewing machine body. The threading device for a sewing machine, wherein the threading device is moved so that the upper thread moves toward the insertion port of the needle bar threading portion opened rearward when the threading device is lowered. . A needle bar that moves up and down while holding a needle having a needle hole at the lower end, a needle bar support that slidably supports the needle bar and swings in a direction perpendicular to the cloth feed direction, A needle bar threading portion located at the lower end, a threading tool having a threading hook, a threading bar having the threading tool at the lower end, and an operation member for moving the threading bar up and down and rotating. In the threading device of the sewing machine for threading the upper thread through the needle hole by operating the operating member,
The threading device provided on the threader is provided with a threadable outer edge that guides the rear position of the upper thread in the vertical movement region, and the threading member is operated by operating the operation member on which the upper thread is hung. When the thread hook of the threading bar descends and rotates, the upper thread guided by the outer edge moves so as to enter the thread hook part from the insertion opening opened behind the needle bar thread hook part. A threading device for a sewing machine, characterized by comprising: A needle bar that moves up and down while holding a needle having a needle hole at the lower end, a needle bar support that slidably supports the needle bar and swings in a direction perpendicular to the cloth feed direction, and the needle bar support A threading rod having a needle threader having a needle hole threading portion that is supported by the body so that it can be moved up and down and rotated behind the needle bar and has a threading hook at the lower end, and attached to the lower end of the needle bar A needle bar thread hooking portion that is provided with an insertion opening that opens rearward and guides the upper thread into the needle hole so that the upper thread can be inserted, and an operation member that moves the threading bar up and down and rotates, In a threading device of a sewing machine that causes the threading hook to protrude and retract in the needle hole by operating an operation member and thread the upper thread into the needle hole,
In the threader, a thread hook that holds one end of the upper thread is formed between a swinging center portion that is a rotation center of the needle hole threading portion and the threading hook. An upper position guide part is formed between the threading hook and the upper thread is guided from the front side of the upper position guide part to the back side of the thread hook. A threading device for a sewing machine, wherein the threading device is configured to enter the inside of the needle bar thread hooking portion from an insertion opening opened to the rear of the bar thread hooking portion.   The threading device for a sewing machine according to claim 1, 2 or 3, wherein the thread hook is formed in a substantially plate shape.   The lower end edge of the yarn hook is formed so as to be inclined downward from the swinging free end side toward the swinging center side. Sewing machine threading device.

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