JP6426059B2 - Threading device of sewing machine - Google Patents

Description

  The present invention relates to a threading device of a sewing machine which passes an upper thread through a needle hole of a sewing machine needle.

  Some sewing machines of this type incorporate a threading mechanism for passing an upper thread through a needle hole of a sewing machine needle. However, in consideration of the complication of the internal structure of the sewing machine, it is desirable to separately provide the threading device on the sewing machine. For example, the sewing machine disclosed in Patent Document 1 includes a yarn separately from the internal mechanism of the sewing machine, an intake nozzle, an air cylinder for advancing and retracting the intake nozzle toward the upper thread, and a vacuum pump communicating with the air cylinder. A threading device is provided. In the prior art, the upper thread is disposed to cross the needle hole of the sewing needle, and the intake nozzle is disposed at the facing position of the upper thread across the needle hole by an air cylinder. By operating the intake nozzle in this state, the upper thread can be passed through the needle hole while being sucked.

Japanese Patent Application Laid-Open No. 06-154461

  However, in the prior art, since the intake nozzle, the air cylinder, and the vacuum pump are essential, the configuration of the threading device is complicated, and the configuration can not be adopted easily. The present invention has been made in view of the above-described points, and the problem to be solved by the present invention is to separately attach a threading device having a relatively simple configuration to a sewing machine.

  As means for solving the above problems, the threading device of the sewing machine according to the first aspect of the present invention is a threading device for passing an upper thread through the needle hole of a sewing machine needle provided in the sewing machine. A fixing portion and a threading portion for passing the upper thread through the needle hole are provided. And although the threading device of the sewing machine of the present invention is separately attached to the sewing machine through the fixing portion, it is desirable that this type of device has a simple structure of the threading portion.

  Therefore, in the present invention, the threading portion can be disposed adjacent to the sewing needle, with a guide path through which the upper thread can pass. Further, the guide path is a passage extending in a direction away from the needle hole, and is opened to the other side of the threading portion different from the first side opening to one side of the threading portion facing the needle hole. And a second opening. Then, in a state where the fixing portion is externally attached to the sewing machine, the threading portion provided directly or indirectly to the fixing portion is adjacent to the sewing needle, and the first opening is disposed at the facing position of the needle hole. In this state, the upper thread is pulled out from the second opening through the guide path while pulling the upper thread, and then the upper thread is cut outside the second opening, so that the upper thread passes through the guide path while being contracted by its own elasticity. Thus, it is configured to be inserted into the needle hole from the first opening. In the present invention, the configuration of the threading portion can be simplified as much as possible by passing the upper thread through the needle hole utilizing the elasticity of the upper thread itself.

  A threading device for a sewing machine according to a second aspect of the present invention is the threading device for a sewing machine according to the first aspect, wherein the guide path has a low friction portion with less friction compared to the outer surface of the threading portion different from the guide path. I decided to provide. In the present invention, the upper thread can be smoothly introduced into the needle hole through the low friction portion of the guide path.

  A threading device for a sewing machine according to a third aspect of the present invention is the threading device for a sewing machine according to the first aspect or the second aspect, wherein the threading device includes a movable portion mounted so as to be movable relative to the fixed portion. A threading portion is provided on the Then, in a state where the fixed portion is externally attached to the sewing machine, the threading portion moves relative to the fixed portion together with the movable portion, thereby comparing the first state disposed adjacent to the sewing needle and the first state. It is displaceable between a second state spaced apart from and above the sewing needle. In the present invention, when the upper thread is passed through the needle hole, the threading portion is placed in the first state adjacent to the sewing needle. Further, after passing the upper thread through the needle hole, the threading portion is placed in the second state and is separated upward from the sewing needle. As described above, in the present invention, the threading portion can be appropriately brought close to or separated from the sewing needle via the movable portion, and the device configuration is easy to use.

  According to the first aspect of the present invention, the threading device having a relatively simple structure can be separately attached to the sewing machine. According to the second aspect of the invention, the threading device having a simple and excellent performance can be separately attached to the sewing machine. According to the third aspect of the present invention, it is possible to separately attach a threading device having a simple and excellent performance to the sewing machine.

It is a perspective view of a threading device and a sewing machine. It is a partially enlarged front view of a threading device and a sewing machine. It is a perspective view of threading device. It is the perspective view which looked at the threading apparatus from another angle. It is a perspective view which disassembles and shows a fixing | fixed part. It is a perspective view which disassembles and shows a movable part and a threading part. It is a perspective view of a threading part. It is sectional drawing of a threading part. It is sectional drawing of the threading part concerning a modification. It is a perspective view of the threading device and sewing machine of the initial stage of a threading procedure. It is a perspective view of the threading device and sewing machine of a threading procedure middle stage. FIG. 2 is a perspective view of a threading device and a sewing machine in a later stage of the threading procedure. It is a perspective view of a threading device and a sewing machine after threading.

  Hereinafter, modes for carrying out the present invention will be described with reference to FIGS. 1 to 13. In the drawings, the symbol F is attached to the front of the sewing machine, the symbol B to the rear of the sewing machine, the symbol UP to the upper part of the sewing machine, the symbol DW to the lower part of the sewing machine, the symbol R to the right of the sewing machine, and the symbol L to the left of the sewing machine. Also in the drawing showing the threading device and its constituent members, the symbol F in the front, the symbol B in the rear, the symbol UP in the upper, the symbol DW in the lower, the right To the left, and L to the left. For the sake of convenience, the reference numerals of the bolt material and the nut material of the threading device shown in each drawing are omitted except for some of the bolt materials (BM1, BM2, A1).

[sewing machine]
The sewing machine 2 shown in FIG. 1 is an electric sewing machine provided with a bed 4 and a head 6 and is provided with a sewing needle 8 and a threading device 10 described later. The sewing needle 8 is provided at the lower left of the head 6 so as to be vertically movable, and the tip end side of the sewing needle 8 is provided with a needle hole 8H for passing the upper thread NY with reference to FIGS. Be Then, referring to FIGS. 1 and 2, the upper thread NY is drawn through the thread guide 6b of the bed 4 while the upper thread NY is drawn out from a thread spool (not shown) set to the sprue pin 6a protruding to the upper right Pass through the needle hole 8 H of the sewing needle 8. At this time, the upper thread NY is passed through the needle hole 8H using the threading device 10 (described in detail later). This type of threading device 10 has a simple structure and simplifies the internal configuration of the sewing machine 2 It is desirable that the machine be separately attached to the sewing machine 2 from the viewpoint of Therefore, in the present embodiment, the threading device 10 having a relatively simple configuration described later is attached to the sewing machine 2 separately. Each component will be described in detail below.

[Threading device]
Referring to FIGS. 1 and 2, threading device 10 is provided on left side 21 of head 6, and has fixed portion 11, movable portion 14 and threading portion 50 (the details of each portion will be described later) ). In the present embodiment, the threading device 10 is externally attached to the sewing machine 2 through the fixing portion 11, and the upper thread is inserted into the needle hole 8H of the sewing needle 8 using the threading portion 50 having a relatively simple configuration. I decided to pass through NY.

[Fixed part]
The fixing portion 11 is a portion externally attached to the sewing machine 2 so as not to move relative to the sewing machine 2 with reference to FIGS. 1 and 2. Referring to FIGS. 3 to 5, this fixing portion 11 is mainly composed of the mounting plate 12 and the guiding plate 13, the first magnet 20, the connecting portion 22, the retaining plate 24, and the thread. The cutting unit 26 and the releasing unit 28 are provided. Then, when the threading device 10 described later is attached, the flat mounting plate 12 is externally attached along the left side 21 of the head 6, and the flat guiding plate 13 is attached to the mounting plate 12. Arrange orthogonally to the left and project to the left. And related structures (20, 22, 24, 26, 28) are disposed at appropriate positions of the main structures 12, 13.

  The mounting plate portion 12 is formed of a flat plate member which can be disposed along the left side surface 21 of the head 6. Referring to FIG. 5, the biasing portion 16 and a plurality of disposition portions (first disposition portions) 31 and the second arrangement 32 and the third arrangement 33). The upper portion of the mounting plate portion 12 is substantially rectangular based on the mounting state of the threading device 10, and the lower portion of the mounting plate portion 12 is broadened to provide a groove-like recess 12c in the approximate center. Further, the surface 12 a of the mounting plate 12 is exposed to the outside in the mounted state, and the back surface 12 b of the mounting plate 12 is disposed to face the left side 21 of the head 6.

  The biasing portion 16 is a portion that biases a movable portion 14 described later upward with reference to FIGS. 2 to 5. Referring to FIG. 3, this biasing portion 16 is comprised of a support pin 16a protruding leftwardly from the top of the surface 12a of the mounting plate 12 and a coil spring 16b attached to the support pin 16a and extending downward. . The first disposition portion 31 is a portion to which the first magnet portion 20 described later is attached with reference to FIG. 5, and is constituted by a pair of through holes H juxtaposed back and forth behind the recessed portion 12c The term “through hole” in the present embodiment means a hole that penetrates the corresponding parts in the thickness direction). The second arrangement portion 32 is a portion to which a connection portion 22 described later can be attached, and is provided at the center of the rear of the mounting plate portion 12. The second disposition portion 32 is constituted by an elongated hole LH extending vertically, and penetrates the mounting plate portion 12 in the thickness direction to open on the front surface 12 a and the back surface 12 b. Then, the shaft portion can be inserted into the edge portion of the second disposition portion 32 while the head portion of the bolt material is locked. The third disposition portion 33 is a portion to which a retaining plate portion 24 to be described later is attached, and is constituted by three through holes H arranged vertically in front of the second disposition portion 32.

  Further, the guide plate portion 13 is formed of a substantially rectangular flat plate member, and referring to FIG. 5, the guide groove portion 18 and a plurality of arrangement portions (the fourth arrangement portion 34, the fifth arrangement portion 35, It has a sixth arrangement portion 36). The guide plate portion 13 projects leftward from the mounting plate portion 12 when the threading device 10 is attached, and the right edge 13 r of the guide plate portion 13 is disposed close to the head 6. Further, the left edge 13l of the guide plate portion 13 is disposed apart from the head 6, and the lower portion of the left edge 13l is cut out in a substantially rectangular shape. The guide groove portion 18 is a groove portion extending up and down while penetrating the guide plate portion 13 in the thickness direction, and can slidably hold the movable portion 14 described later. The guide groove portion 18 is substantially L-shaped in front view, and the upper side is linear, and the lower side is gradually bent toward the right edge 13 r while being bifurcated. A claw portion 19 having a substantially rectangular shape in a front view is formed on the lower right side of the guide groove portion 18, and the claw portion 19 is disposed between the bifurcated guide groove portions 18.

  Further, the fourth arrangement portion 34 is a portion to which a thread cutting portion 26 to be described later is attached with reference to FIG. 5, and is constituted by three through holes H which are vertically aligned in the lower left side of the guide plate portion 13. The fifth disposition portion 35 is a portion to which a release portion 28 described later is rotatably attached, and is constituted by a through hole H formed at the center on the right side of the guide plate portion 13. Further, the sixth arrangement portion 36 is a portion to which a connection portion 22 described later is attached, and is constituted by a pair of elongated holes WH1 arranged vertically in parallel on the upper right side of the guide plate portion 13. Each of the long holes WH1 is a through hole which is widened laterally, and the shaft can be inserted into the edge of the long hole WH1 while the head of the bolt material is locked.

  The first magnet unit 20 is a part that holds a movable unit 14 described later in a first state with reference to FIG. 3 and can magnetically attract the second magnet unit 40 described later. Referring to FIG. 5, the first magnet unit 20 is formed of a substantially rectangular flat plate member, and a pair of through holes H is provided in the upper portion of the first magnet unit 20 to form the first disposition unit 31. It arranges so that facing of each through-hole H of can be carried out. Further, the retaining plate portion 24 is a portion where the mounting plate portion 12 is externally attached and fixed to the left side surface 21 of the head 6, and is constituted by a flat plate member substantially rectangular in a front view. Three through holes H are vertically provided in parallel in the retaining plate portion 24, and the through holes H face the respective through holes H of the third arrangement portion 33 in a face-to-face manner.

  Further, referring to FIG. 5, the connecting portion 22 is a portion connecting the mounting plate portion 12 and the guide plate portion 13, and is formed of a substantially L-shaped flat plate member. A pair of through holes H which can face each through hole H of the sixth arrangement portion 36 is provided in one piece 22a of the connection portion, and each other of the second arrangement portion 32 is provided in the other piece 22b of the connection portion. A pair of long holes WH2 that can face the through holes H are provided. Each of the long holes WH2 is a through hole which is widened in the front and rear direction, and the shaft can be inserted into the edge of the long hole WH2 while the head of the bolt material is locked.

  Further, referring to FIG. 11, the thread cutting portion 26 is a portion for cutting the upper thread NY, and is constituted by a flat plate member substantially rectangular in a front view. Referring to FIG. 5, this threading portion 26 has a long hole 26a extending vertically and a bolt-like cutting portion 26b. The long holes 26a are through holes that can be disposed facing each through hole H of the fourth arrangement portion 34, and the shaft portion of the long holes 26a is locked while the head portion of the bolt material is locked. It can be inserted. The cutting portion 26 b is provided at the lower end of the thread cutting portion 26, and is exposed from a notch portion provided on the lower left side of the guide plate portion 13 in the mounted state. The release portion 28 is a portion for displacing the movable portion 14 described later from the first state to the second state, and is formed of a flat plate member bent in a crank shape. A through hole H is provided at the center of the release portion 28 so as to face the fifth arrangement portion 35.

[movable part]
The movable portion 14 is a portion provided so as to be movable relative to the fixed portion 11 with reference to FIGS. 2 to 4 and 6, and is configured by a flat member having a substantially L shape in a front view. The movable portion 14 includes a plurality of disposition portions (the seventh disposition portion 37, the eighth disposition portion 38, the ninth disposition portion 39, the auxiliary disposition portion 60), the second magnet portion 40, and the engagement. It has a section 42. The upper portion of the movable portion 14 is linear based on the attachment state of the threading device 10, and the lower portion of the movable portion 14 is gradually bent toward the left side surface 21 of the head 6.

  The seventh arrangement portion 37 is a portion to which a threading portion 50 to be described later is attached, and is constituted by a pair of through holes H juxtaposed vertically at the lower end of the movable portion 14. The eighth arrangement portion 38 is a portion to which a second magnet portion 40 to be described later is attached, and is constituted by a pair of through holes H which are vertically aligned in the upper portion of the movable portion 14. Further, the ninth arrangement portion 39 is a portion to which a later-described locking portion 42 is attached, and is constituted by a pair of through holes H arranged in parallel above and below the eighth arrangement portion 38. The auxiliary disposition portion 60 is constituted by the through hole H at the upper end of the movable portion 14, and a pin member (not shown) to which the lower portion of the coil spring 16b can be attached can be inserted. The configuration in which the auxiliary disposition unit 60 is not used will be described).

  Further, referring to FIG. 3, second magnet unit 40 is a site that magnetically attracts to first magnet unit 20, and is configured of a substantially L-shaped flat plate member as shown in FIG. 6. A pair of through holes H is provided in one piece of the second magnet unit 40 and arranged to face the eighth disposition unit 38, and the other piece of the second magnet unit 40 is bent at a right angle to the one piece. Do. The locking portion 42 is a portion that can be locked to the claw portion 19 of the guide groove portion 18 with reference to FIG. 4, and is a substantially cubic member having a pair of through holes H with reference to FIG. 6. Configured The left and right width dimensions of the locking portion 42 are set larger than the opening dimension of the guide groove portion 18. Further, the pair of through holes H of the locking portion 42 are disposed so as to face the ninth arrangement portion 39, and the separation dimension of the pair of through holes H is larger than the dimension of the claw portion 19 in the vertical direction. It is set.

[Threading section]
Threading portion 50 is a portion for passing upper thread NY through needle hole 8H with reference to FIGS. 10 to 13, and with reference to FIGS. 6 to 9, a pair of through holes H and needle groove portion 52. , Guide path 54 and an insertion port 56. Here, the material of the threading portion 50 is not particularly limited, but metal and resin can be typically exemplified, and metal such as aluminum and brass having small frictional resistance is preferable among them. 6 and 7, the threading portion 50 is formed of a substantially cubic member, and the surface 50a of the threading portion 50 is exposed to the outside in the mounted state, and the threading portion 50 is formed. The rear surface 50 b of the second embodiment is disposed to face the movable portion 14.

  The threading portion 50 is displaced between the first state and the second state by the relative movement of the movable portion 14 with respect to the fixed portion 11 described later with reference to FIG. The threading portion 50 in the first state is disposed adjacent to the sewing needle 8 so that the upper thread NY can be passed through the needle hole 8H (see the two-dot broken line state in FIG. 2 and FIG. 10). At this time, the right side surface 50r of the threading portion 50 is disposed adjacent to the needle hole 8H, and the left side surface 50l of the threading portion 50 is disposed away from the needle hole 8H. In addition, the threading portion 50 in the second state is spaced apart from the needle hole 8H and disposed above the first state (see the solid line state in FIG. 2 and FIG. 13).

  The pair of through holes H of the threading portion 50 penetrates from the surface 50a to the back surface 50b of the threading portion 50 with reference to FIGS. 6 and 7, and the respective through holes of the seventh arrangement portion 37 Placed face-to-face in H. The needle groove portion 52 is a portion for positioning the threading portion 50 and the sewing needle 8. The needle groove portion 52 is a groove-like recess extending in the vertical direction formed on the right side surface 50r of the threading portion 50, and is disposed at a position where the sewing needle 8 can be held therein in the first state.

[Guideway]
Further, referring to FIGS. 8 and 10 to 13, guide path 54 is a straight passage through which upper thread NY can pass, and has a first opening 54a, a second opening 54b, and a narrow portion 54c. Have. The threading portion 50 is a passage that penetrates the threading portion 50 from the right side surface 50r to the left side surface 50l, and gradually inclines upward as going from the right side surface 50r to the left side surface 50l. The first opening 54a is an opening that has a substantially circular shape in a front view, and is disposed below the right side surface 50r. The second opening 54b is a substantially circular opening having a diameter larger than that of the first opening 54a, and is disposed above the first opening 54a on the left side surface 21. The narrow portion 54c is, as shown in FIG. 8, a conical portion provided in the middle of the guide path 54, and the opening dimension gradually decreases from the second opening 54b side toward the first opening 54a side. Be tightened to The narrowing portion 54c causes the guide path 54, which has a large diameter at the second opening 54b side, to be tightened while being tightened, and travels toward the first opening 54a.

  7 and 10, the insertion port 56 is an opening for inserting the upper thread NY into the guiding path 54, and communicates with the guiding path 54 from the surface 50a of the threading portion 50. The insertion port 56 has a substantially reverse T-shape in a front view, and a first insertion portion 58a extending from the upper surface of the threading portion 50 toward the guide path 54, and the first insertion portion 58a. And a second insertion portion 58b communicating and extending along the guide path 54. The first insertion portion 58a communicates with the middle of the guide path 54 on the lower side thereof, and the second insertion portion 58b is gradually inclined upward along the guide path 54 and the left side surface of the threading portion 50 It opens in 2 l.

[Modification]
Here, the configuration of the guiding path can take various configurations other than the above-described configuration. For example, in the present modification, referring to FIG. 9, a funnel-shaped low friction portion 70 can be press-fit into the guide passage 54. The low friction portion 70 can be composed of a member with less friction than the outer surface (front surface 50a, back surface 50b, right side surface 50r, left side surface 50l, upper surface and lower surface of reference numerals omitted) of the threading portion 50. For example, in the present modification, the threading portion 50 can be formed of a resin such as acrylic resin which is easy to be molded, and the low friction portion 70 is formed of a metal such as aluminum or brass having a coefficient of friction smaller than that of the resin. it can. Then, the low friction portion 70 is disposed in the guide path portion from the narrow portion 54 c to the first opening 54 a. Thus, in the present modification, referring to FIG. 12, upper thread NY can be smoothly introduced to needle hole 8H through low friction portion 70 shown in FIG. 9 in the threading operation described later. As another example, after forming the metal threading portion 50 such as aluminum or brass, a low friction portion made of a resin layer such as silicon having a small coefficient of friction is formed in all or part of the guide path 54 It can also be done. When the entire threading portion 50 is made of metal, the inner surface of the guide path 54 can be polished to form a low friction portion.

[Installation work of fixed part]
Referring to FIG. 5, the mounting plate portion 12 and the guide plate portion 13 are connected, and the related configurations (22, 24, 26, 28) are attached to appropriate positions of the both plate portions. In the present embodiment, the mounting plate portion 12 and the guide plate portion 13 are connected via the connecting portion 22. That is, one piece 22a of the connecting portion is connected to the sixth arrangement portion 36 of the guide plate portion 13 via the bolt material and the nut material. At this time, by adjusting the locking position of each bolt material to the elongated hole WH1 of the sixth arrangement portion 36, the arrangement position of the guide plate portion 13 relative to the mounting plate portion 12 can be adjusted. Next, while the guide plate portion 13 is disposed orthogonal to the surface 12 a of the mounting plate portion 12, the other piece 22 b of the connecting portion is connected to the second disposition portion 32 of the mounting plate portion 12 via the bolt material and the nut material. Connect to At this time, by adjusting the locking position of each bolt material to the long hole LH of the second arrangement portion 32, the arrangement position of the guide plate portion 13 with respect to the mounting plate portion 12 in the vertical direction can be adjusted. Furthermore, the adjustment position of the guide plate portion 13 with respect to the mounting plate portion 12 can be adjusted in the front-rear direction by adjusting the locking position of each bolt member to the long hole WH2 provided in the other piece 22b of the connecting portion.

  Before and after the above-mentioned work, in the guide plate portion 13, the cut portion 26b is guided while being attached to the fourth disposition portion 34 of the guide plate portion 13 via the bolt material and the nut material. It protrudes from the lower part of the board part 13, and is arrange | positioned. At this time, by adjusting the locking position of each bolt material with respect to the long hole 26a of the thread cutting portion 26, the position of the cutting portion 26b in the vertical direction can be adjusted. In the present embodiment, referring to FIG. 10, it is preferable to dispose the cut portion 26b on an extension line of the upper thread NY drawn out from the second opening 54b and extended straightly to the left and upward. Further, the release portion 28 is rotatably attached to the fifth arrangement portion 35 of the guide plate portion 13 via a bolt material as the rotation axis A1. At this time, the lower portion of the release portion 28 extending downward from the rotation axis A1 is disposed to the right of the guide groove portion 18, and the lower portion of the release portion 28 is rotated by the rotation of the release portion 28 around the rotation axis A1. Allows rotational movement to the side. Then, in the mounting plate portion 12, while mounting the first magnet portion 20 to the first disposition portion 31 of the mounting plate portion 12 via a bolt material, the lower portion of the first magnet portion 20 is viewed from the lower portion of the mounting plate portion 12 Put out protruding.

[Arranging work of movable part and threading part]
Referring to FIG. 6, the second magnet 40, the locking portion 42, and the threading portion 50 are attached to the movable portion 14. At this time, the threading portion 50 is attached to the seventh arrangement portion 37 of the movable portion 14 via a bolt material while the first opening 54a is directed to the right. Further, the second magnet portion 40 is protruded from the back surface of the movable portion 14 while being attached to the eighth arrangement portion 38 of the movable portion 14 via a bolt material. Then, as described later, referring to FIG. 3, the second magnet unit 40 comes into contact with the first magnet unit 20 while moving downward and to the right as the movable unit 14 moves relative to the second magnet unit 40.

  Further, referring to FIG. 6, while attaching the locking portion 42 to the ninth arrangement portion 39 of the movable portion 14, the movable portion 14 is attached so as to be relatively movable to the fixed portion 11 with reference to FIGS. . At this time, referring to FIG. 4, the movable portion 14 is disposed to face the guide groove portion 18 from the back surface side of the guide plate portion 13, and the locking portion 42 is applied from the surface side of the guide plate portion 13. In this state, the locking portion 42 is attached to the ninth arrangement portion 39 of FIG. 6 via the bolt members BM1 and BM2, and the movable portion 14 is slidably attached to the guide groove portion 18. Then, the lower part of the coil spring 16b constituting the biasing part 16 is attached to the shaft part of the bolt material BM1 on the upper side connecting the movable part 14 and the locking part 42, thereby biasing the movable part 14 upward. . By thus disposing the movable portion 14 in the upper portion of the guide groove portion 18 with reference to FIGS. 2 and 13, the threading portion 50 is held in the second state.

  Further, the movable portion 14 is slid along the guide groove 18 from the upper side to the lower side and to the right, against the biasing force of the biasing portion 16. The sliding movement of the movable portion 14 displaces the threading portion 50 from the second state to the first state to be adjacent to the sewing needle 8 with reference to FIG. At this time, in the present embodiment, the locking portion 42 moves to the lower end of the guide groove portion 18 with reference to FIG. 4 so that the space between the pair of bolt members BM1 and BM2 connecting the locking portion 42 and the movable portion 14. The claws 19 are locked. Furthermore, referring to FIG. 3, the second magnet unit 40 slides along with the movable unit 14 and abuts on the first magnet unit 20 to be attracted to each other. Thus, referring to FIG. 10, the threading portion 50 is held in the first state by the locking of the locking portion 42 and the claw portion 19 and the adsorption of the first magnet portion 20 and the second magnet portion 40. .

[External work of threading device]
Referring to FIG. 5, fixing portion 11 is fixed to left side surface 21 of head 6 with reference to FIG. 2 while fixing plate portion 24 is mounted to third arrangement portion 33 of mounting plate portion 12. At this time, referring to FIG. 2, the mounting plate portion 12 is placed on the left side surface 21 and the retaining plate portion 24 is disposed in the head 6. Then, the threading device 10 is fixed by bolting the third arrangement portion 33 and the retaining plate portion 24 of FIG. 5 through a not-shown through hole (typically an elongated hole extending vertically) provided on the left side surface 21; It can be externally attached to the sewing machine 2 via the fixing portion 11. At this time, by adjusting the locking positions of the bolt members with respect to the long holes (not shown) of the left side surface 21, it is possible to adjust the vertically arranged position of the fixing portion 11 with respect to the left side surface 21 of the head 6.

[Threading work]
Referring to FIGS. 1 and 2, the upper thread NY is passed through the thread guide 6b of the bed 4 through the needle hole 8H of the sewing needle 8 while being pulled out from the top of the head 6. At this time, the upper thread NY is passed through the needle hole 8H using the threading device 10 externally attached to the sewing machine 2. It is desirable that this type of threading device 10 be simple in structure. Therefore, in the present embodiment, the configuration of the threading portion 50 is simplified by using a threading procedure described later.

  That is, referring to FIG. 10, threading portion 50 is displaced from the second state to the first state by sliding movement of movable portion 14 from the upper side of guide groove portion 18 to the lower side and the sewing machine needle 8. Adjacent to In the threading portion 50 in the first state, referring to FIG. 7, the sewing needle 8 is held in the needle groove portion 52, and the needle hole 8H is disposed at the facing position of the first opening 54a. Referring to FIG. 10, the upper thread NY is guided into the guide path 54 through the insertion port 56 while being pulled. At this time, the upper thread NY is drawn from the second opening 54b while being inserted into the guide passage 54 through the second insertion portion 58b while passing through the first insertion portion 58a. Then, referring to FIG. 11, the upper thread NY coming out of the second opening 54b is cut at the cutting portion 26b while being pulled leftward and upward. By doing this, referring to FIG. 12, the upper thread NY is inserted into the needle hole 8H from the first opening 54a through the guide path 54 while being contracted by its own elasticity. At this time, since the guide path 54 gradually inclines downward as going from the second opening 54b to the first opening 54a, the upper thread NY can be smoothly introduced into the needle hole 8H. Furthermore, the guiding path 54 is tightened by the narrow portion 54c, whereby the upper thread NY can be more reliably guided to the needle hole 8H.

  Then, after the threading operation, referring to FIG. 13, the movable portion 14 is slid upward and leftward with respect to the fixed portion 11 to displace the threading portion 50 from the first state to the second state. . At this time, by rotating the release portion 28 clockwise around the rotation axis A1, the lower portion of the release portion 28 separates the first magnet portion 20 and the second magnet portion 40, and the locking portion 42 is leftward. It is pushed and disengaged from the nail portion 19. As a result, the movable portion 14 is moved to the upper side of the guide groove portion 18 by the biasing force of the biasing portion 16 to displace the threading portion 50 to the second state, and the sewing needle 8 compared to the first state. Can be spaced apart from and above. By setting the threading portion 50 in the second state in this way, it is possible to avoid the threading portion 50 from interfering with the sewing operation as much as possible.

  As described above, in the present embodiment, the threading device 10 is separately attached to the sewing machine 2 via the fixing portion 11. Moreover, the configuration of the threading portion 50 can be simplified as much as possible by the principle of passing the upper yarn NY through the needle hole 8H by utilizing the elasticity of the upper yarn NY itself. Further, in the present embodiment, the threading portion 50 can be appropriately brought close to or separated from the sewing needle 8 via the movable portion 14, and the device configuration is easy to use. Therefore, according to this embodiment, the threading device 10 having a relatively simple configuration can be separately attached to the sewing machine 2.

  The threading device of the sewing machine of the present embodiment is not limited to the above-described embodiment, and various other embodiments can be taken. In the present embodiment, the configuration (shape, size, arrangement position, etc.) of the threading device 10 is exemplified, but the configuration of the device can be changed as appropriate. For example, by making the fixed part removable from the sewing machine as appropriate, the movable part can be omitted and the threading part can be directly provided to the fixed part. Further, the attachment position of the threading device can be changed according to the configuration of the sewing machine. Moreover, while urging | biasing a movable part below, the structure which latches a movable part in the upper part of a guide plate part can also be provided.

  Further, in the present embodiment, the configurations (shapes, dimensions, arrangement positions, relative movement directions, types of related configurations, etc.) of the fixed portion 11 and the movable portion 14 are illustrated, but the configuration of these portions is not limited. For example, in addition to the case where the movable part is moved relative to the fixed part in the vertical and horizontal directions, relative movement (sliding movement, rotational movement, etc.) is also possible. In addition, the related configuration of the fixed portion and the movable portion can be omitted or changed as appropriate. For example, instead of each magnet portion, a locking portion that regulates relative movement between the fixed portion and the movable portion in the left-right direction can be provided. Further, as a mounting method of the related configuration, in addition to bolting, various methods such as screwing, integral molding, welding, bonding and the like can be exemplified.

  Further, in the present embodiment, the configuration (shape, dimensions, arrangement position, etc.) of the threading portion 50 is exemplified, but the configuration of the same portion is not limited. For example, the threading portion in the second state may be disposed at a position that does not interfere with the sewing operation, and is separated from the sewing needle in any of the vertical direction, the horizontal direction, and the longitudinal direction compared to the first state. Can be arranged. Further, the guide path may extend horizontally as well as when extending in an inclined manner, and may be bent or curved midway as long as the upper thread can pass through. And the opening position and opening size of the first opening and the second opening can be appropriately changed according to the types of upper thread and needle thread to be used.

  The sewing machine to which the threading device 10 of the present embodiment is attached can sew various face materials, for example, can sew a seat cover of a vehicle seat. As this kind of vehicle seat, vehicle seats for vehicles, aircraft, trains, etc. can be illustrated.

Reference Signs List 2 sewing machine 2 l left side 4 bed 6 head 8 sewing needle 8 H needle thread 10 threading device 11 fixing portion 12 mounting plate portion 13 guide plate portion 14 movable portion 16 urging portion 18 guide groove portion 19 claw portion 20 first magnet portion 22 connection Part 24 Retaining plate part 26 Thread cutting part 28 Release part 31-39 Placement part 40 Second magnet part 42 Locking part 50 Threading part 52 Needle groove part 54 Guideway 54a First opening 54b Second opening 54c Narrow part 56 Insertion 70 Low friction part NY Upper thread

Claims (3)

In a threading device for passing an upper thread through a needle hole of a sewing machine needle provided in a sewing machine,
The threading device includes a fixing portion that can be externally attached to the sewing machine, and a threading portion that passes the upper thread through the needle hole, and the threading portion has a guide path through which the upper thread can pass. And the guide path is a passage extending in a direction away from the needle hole, the guide path being open at one side of the threading portion facing the needle hole. And an opening portion, and a second opening portion opened to the other side of the threading portion different from the one side,
In a state in which the fixing portion is externally attached to the sewing machine, the threading portion provided directly or indirectly to the fixing portion is adjacent to the sewing needle to set the first opening at the facing position of the needle hole The upper thread is made elastic by pulling out the upper thread while pulling out the upper thread from the second opening through the guide path and then cutting the upper thread outside the second opening. A threading device of a sewing machine configured to be inserted into the needle hole from the first opening through the guide path while being contracted by the movement.   The threading device for a sewing machine according to claim 1, wherein the guide path is provided with a low friction portion with less friction compared to the outer surface of the threading portion different from the guide path. The threading device includes a movable portion attached to be able to move relative to the fixed portion, and the movable portion is provided with the threading portion.
In a state in which the fixing portion is externally attached to the sewing machine, the threading portion moves relative to the fixing portion together with the movable portion to position the threading portion adjacent to the sewing needle; 3. The threading device for a sewing machine according to claim 1, wherein the threading device is displaceable between a second state spaced apart from the sewing machine needle and disposed above the first state.

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