JP2013094423A - Sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sewing machine that prevents noise from being generated from a contact portion between a needle bar linkage rod and a needle bar.SOLUTION: A sewing machine comprises a needle bar linkage rod 50. The needle bar linkage rod 50 includes an upper end portion 51 incorporating a bearing therein, a lower end portion 52, and a shaft portion connecting the upper end portion 51 and the lower end portion 52. The lower end portion 52 is formed in a cylindrical form and a shaft portion 57 is disposed through a center portion of the lower end portion, a first square piece 55 and a second square piece 54 so as to be overlapped with each other. The shaft portion 57 includes a shaft 57A and a flange portion 57B formed at one end of the shaft 57A. The flange portion 57B has a diameter larger than that of the shaft 57A. The first square piece 55 and the second square piece 54 are positioned between the flange portion 57B and the lower end portion 52 and are rotatably held around the shaft 57A. A screw is screwed into the shaft 57A to fix it. A pair of protruding members 53 spaced from each other are provided in the lower end portion 52. A third guiding member 60 is disposed between the protruding members 53.

Description

  The present invention relates to a sewing machine, and more particularly to a sewing machine having a needle bar drive mechanism.

  2. Description of the Related Art Conventionally, there are sewing machines that perform zigzag stitching, hole stitching, and the like while a needle bar swings. The sewing machine includes a needle bar drive mechanism that is connected to the upper shaft, transmits the rotation of the upper shaft to the needle bar, and drives the needle bar in the vertical direction. The needle bar drive mechanism includes a needle bar linkage that connects the upper shaft and the needle bar. The needle bar linkage may tilt in the horizontal plane due to rattling of the connecting portion with the upper shaft. For example, the sewing machine disclosed in Patent Document 1 includes first guide means and second guide means for guiding the lower end of the needle bar linkage in the vertical direction. As shown in FIG. 12, the first guide means 230 includes a guide member 231 and a square piece 232 disposed on the right side (in FIG. 12) of the needle bar linkage 220. The guide member 231 is a substantially rectangular member for guiding the vertical movement of the square piece 232, and has a groove portion 231A extending in the vertical direction on the side surface of the needle bar linkage 220 side. In the groove portion 231A, the square piece 232 is slidable in the vertical direction.

  The square piece 232 is a substantially rectangular member that slides in the groove portion 231A of the guide member 231 as described above. The square piece 232 is provided at a lower end 222 of the needle bar linkage 220 on an axis (not shown) provided in a direction orthogonal to the moving surface of the needle bar linkage 220.

  The second guide means 240 includes a guide member 241 and a square piece 242 disposed on the left side (in FIG. 12) of the needle bar linkage 220. The guide member 241 is a substantially rectangular member for guiding the vertical movement of a square piece 242 to be described later, and has a slit 241 </ b> A opened in the vertical direction on the side surface facing the needle bar linkage 220. The slit 241A allows the square piece 242 to slide up and down.

  The square piece 242 is a substantially rectangular member that slides in the slit 241 </ b> A of the second guide unit 240. The square piece 242 is provided at a lower end 222 of the needle bar linkage 220 on a shaft 242A provided in a direction orthogonal to the movement surface of the needle bar linkage 220. The shaft 242A is provided with a square piece 252 on the left side (in FIG. 12) of the square piece 242. The square piece 252 slides in a guide groove 251B formed in the guide member 251 of the driving force transmission means 250. The driving force transmission means 250 transmits the movement of the lower end 222 of the needle bar linkage 220 to the needle bar 212 via the square piece 252. The sewing machine guides the movement of the lower end 222 of the needle bar linkage 220 by first guide means 230 and second guide means 240 provided on the left and right sides of the needle bar linkage 220. Therefore, the sewing machine prevents the needle bar linkage 220 from tilting in the horizontal plane.

JP 2003-24664 A

  However, in the sewing machine disclosed in Patent Document 1, there is a possibility that the square piece 252 provided at the lower end 222 of the needle bar linkage 220 moves in the axial direction of the shaft 242A and approaches or separates from the needle bar 212. When the square piece 252 moves in the axial direction of the shaft 242A, the square piece 252 and the wall surface 251D of the guide groove 251B come into contact with each other and noise is generated.

  The objective of this invention is providing the sewing machine which prevents that a noise generate | occur | produces from the connection part of a needle bar linkage and a needle bar.

  The sewing machine according to the first aspect of the present invention includes a needle bar base that supports a needle bar so as to be movable in the axial direction of the needle bar, and a swing that swings the needle bar together with the needle bar base in a vertical plane. Means and a needle bar linkage for driving one end of the needle bar in the axial direction with one end circularly moving in a vertical plane parallel to the vertical plane by a driving force supplied from a driving source. In the sewing machine, a first guide member that is provided integrally with the needle bar and has a first guide groove formed in the swinging direction of the needle bar by the swinging means, and the other end of the needle bar linkage. A first square piece that moves in the first guide groove and transmits the movement of the needle bar linkage to the needle bar via the first guide member; and parallel to the axial direction of the needle bar. A second guide member having a second guide groove formed on the other end of the needle bar linkage, and moving in the second guide groove A second square piece that guides the other end of the needle bar linkage along the second guide groove; and a collar part, rotatably supporting the first square piece and the second square piece, and A shaft portion fixed to the other end of the needle bar linkage, a projection provided to project at the other end of the needle bar linkage in a direction perpendicular to the extending direction of the shaft portion, and guide the projection Thus, a third guide member for guiding the needle bar linkage in parallel with the axial direction of the needle bar is provided.

  In this sewing machine, the movement of the needle bar linkage is transmitted to the needle bar via the first guide member by the first square piece. The second square piece moves in the second guide groove and guides the other end of the needle bar linkage along the second guide groove. In addition, the third guide member guides the needle bar linkage to the other end of the needle bar linkage by projecting the protruding portion provided in a direction orthogonal to the extending direction of the shaft portion. Guide in parallel with the axial direction of the needle bar. Therefore, the third guide member can prevent the needle bar linkage from being inclined to the needle bar side or the opposite side of the needle bar.

  In the sewing machine, the shaft portion may be inserted between the first square piece and the second square piece so as to be sandwiched between the collar portion and the other end of the needle bar linkage. . In this sewing machine, since the collar portion sandwiches the first square piece and the second square piece between the other end of the needle bar linkage, the first square piece and the second square piece are arranged on the shaft. It can prevent moving in the axial direction of the part. Therefore, the sewing machine can prevent noise from the contact portion between the first square piece and the first guide member and improve durability. In the sewing machine, the first square piece and the second square piece are inserted through the shaft portion and fixed to the other end of the needle bar linkage, so that the needle bar linkage can be easily assembled. In addition, it is easy to supply oil to mechanisms that require lubrication, such as the first square piece and the second square piece.

  Further, in the sewing machine, the protruding portion is a pair of protruding members provided in a direction perpendicular to the extending direction of the shaft portion at the other end of the needle bar linkage, and the third guide member is A plate-like portion inserted between the pair of protruding members and extending in parallel with the axial direction of the needle bar may be provided. In this sewing machine, the plate-like portion of the third guide member is inserted between the pair of protruding members, and the other end of the needle bar linkage is guided in parallel with the axial direction of the needle bar. Therefore, the sewing machine can prevent the needle bar linkage from being inclined in the direction of the needle bar side or the opposite side of the needle bar.

  In the sewing machine, the third guide member may be fixed to an arm portion of the sewing machine. In this sewing machine, since the third guide member is fixed to the arm portion of the sewing machine, the assembling work is facilitated.

2 is a perspective view showing an internal drive mechanism of the sewing machine 1. FIG. 2 is an exploded perspective view of an internal drive mechanism of the sewing machine 1. FIG. It is a perspective view from the diagonally upper right of the needle bar linkage 50. It is a perspective view from the upper left diagonal of the needle bar linkage 50. It is an enlarged view of the lower end part 52 of the needle bar linkage 50. 2 is a perspective view from the front side of an arm 100. FIG. FIG. 6 is a perspective view of a structure in the vicinity of a needle bar linkage 50, a second square piece 54, and a first square piece 55. It is the perspective view seen from the back side of the mechanism of the needle bar linkage 50 vicinity of FIG. FIG. 8 is a rear view of the mechanism in the vicinity of the needle bar linkage 50 in FIG. 7. FIG. 6 is a perspective view (the second guide member 80 is omitted) viewed from the front side of the arm 100. FIG. 3 is a perspective view of the arm 100 viewed from the upper right side. It is a perspective view which shows the drive mechanism inside the sewing machine of a prior art.

  Hereinafter, a sewing machine 1 according to an embodiment of the present invention will be described. In the following description, the front side, the back side, the upper side, the lower side, the left side, and the right side in FIG. 1 are the right side, left side, upper side, lower side, front side, and rear side of the sewing machine 1, respectively.

  As shown in FIG. 1, the sewing machine 1 includes a needle bar drive mechanism 2 and a sewing machine motor 3. The needle bar drive mechanism 2 is provided on the front side of the sewing machine 1. The sewing machine motor 3 is provided on the rear side of the sewing machine 1. The needle bar drive mechanism 2 is connected to the sewing machine motor 3 via the upper shaft 4. The sewing machine 1 is provided with a swing shaft 5 that swings a swing lever 15 (described later) in parallel with the upper shaft 4 below the upper shaft 4. The needle bar drive mechanism 2 includes a balance crank 30, a needle bar linkage 50, a needle bar base 10, a needle bar 8, a third guide member 60, and the like. The needle bar base 10 can swing in the left-right direction about the shaft 12.

  Details of the structure of the needle bar drive mechanism 2 will be described with reference to FIG. The needle bar 8 extends in the vertical direction, and fixes the sewing needle 6 to the lower end portion. The needle bar 8 integrally fixes the needle bar holder 22 slightly above the central part in the axial direction (longitudinal direction). The needle bar holder 22 includes a needle bar support 22A, a first guide groove 22B, a sliding protrusion 22C, and the like.

  The needle bar support portion 22 </ b> A is a member for supporting and fixing the needle bar 8 and has an opening along the axial direction of the needle bar 8. By inserting the needle bar 8 into the opening, the needle bar holder 22 supports the needle bar 8 on the needle bar support portion 22A so as to be movable integrally.

  The first guide groove 22 </ b> B is a substantially U-shaped groove portion that rolls over in the left side view and extends in the direction orthogonal to the axial direction of the needle bar 8 and in the left-right direction of the sewing machine 1 (see FIG. 1). The first guide groove 22B is disposed such that the opening portion faces rearward. The vertical height of the first guide groove 22B is slightly larger than the vertical height of the first square piece 55 so that a first square piece 55 described later can slide in the first guide groove 22B.

  The sliding protrusion 22C is a member disposed so as to protrude from the left side surface portion of the needle bar support portion 22A. The sliding projection 22C is slidable along the elongated hole 21A of the needle bar guide member 21 fixed to the left end of the needle bar base 10. The needle bar guide member 21 is a substantially rectangular plate that can swing in the left-right direction integrally with the needle bar base 10. The long hole 21 </ b> A is a long hole extending in the vertical direction of the needle bar guide member 21. Therefore, the needle bar holder 22 can guide the needle bar 8 up and down and prevent rotation about the axis of the needle bar 8 by sliding the sliding projection 22C along the long hole 21A.

  The needle bar base 10 supports the needle bar 8 so as to be swingable in the left-right direction. The needle bar base 10 includes a support part 11, a shaft 12, a lower end part 13, a connection part 14, and the like. The support portion 11 is provided at the upper end portion of the needle bar base 10. The support portion 11 can be inserted through the shaft 12. The shaft 12 is fixed to the head 101 (see FIG. 6) of the arm 100 of the sewing machine 1. The support portion 11 can swing around the head 101 about the shaft 12. The lower end 13 has a hole (not shown) through which the needle bar 8 can be inserted. The connecting portion 14 is a substantially U-shaped recess in plan view that protrudes behind the lower end portion 13. The connecting portion 14 is connected to a first triangular piece 17 provided on a shaft 16 of a swing lever 15 described later. The needle bar base 10 swings in the left-right direction within the vertical plane about the shaft 12 by the swing of the swing lever 15.

  The needle bar base 10 includes a needle bar base guide 18 and a needle bar base stopper 19 in front of the lower end portion 13. The needle bar guide 18 is an L-shaped member in plan view attached to the head 101 (see FIG. 6). The needle bar base guide 18 positions the needle bar base 10 in the front-rear direction and guides swinging in the left-right direction. The needle bar base stopper 19 is located to the left of the needle bar base guide 18 and restricts the swing of the lower end portion 13 of the needle bar base 10. The needle bar base stopper 19 is fixed to the head 101 by a pair of screws 20.

  The balance crank 30 is fixed to the front end portion of the upper shaft 4. The balance crank 30 includes a balance 31 and a balance body 32. The balance 31 is provided at the tip of the balance body 32 and protrudes upward. The balance body 32 is rotatably attached to the balance crank 30. The balance crank 30 inserts and fixes the needle bar crank 40 in the center of the left side surface. The needle bar crank 40 has a protrusion 41 inserted and fixed at the center of an upper end 51 of a needle bar linkage 50 described later.

  The structure of the needle bar linkage 50 will be described with reference to FIGS. The needle bar linkage 50 is a substantially bar-shaped member for transmitting the rotation of the upper shaft 4 to the needle bar 8. The needle bar linkage 50 includes an upper end portion 51, a lower end portion 52, and a shaft portion 50A. The upper end 51 is formed in a substantially circular shape when viewed from the front, and a bearing built-in portion 51A having a built-in bearing is fitted inside. 51 A of built-in bearings provide the screw 51B in the center. The screw 51B is screwed into the protrusion 41 of the needle bar crank 40. Therefore, the needle bar linkage 50 is rotatable at the upper end 51 around the screw 51B. The lower end portion 52 is formed in a cylindrical shape, and the shaft portion 57 can be inserted through the center portion thereof. The shaft portion 50 </ b> A connects the upper end portion 51 and the lower end portion 52.

  As shown in FIG. 5, the shaft portion 57 includes a shaft 57A and a flange portion 57B formed at one end portion of the shaft 57A. The flange portion 57B has a diameter larger than that of the shaft 57A. The first square piece 55 and the second square piece 54 are substantially rectangular members, each having a hole through which the shaft 57A can be inserted. The shaft portion 57 is inserted into the lower end portion 52 through the first square piece 55 and the second square piece 54 overlapped with each other. The screws 58 and 59 are screwed into the lower end portion 52 to fix the shaft portion 57. The first square piece 55 and the second square piece 54 are sandwiched between the flange portion 57B and the lower end portion 52, and are held rotatably around the shaft 57A.

  As shown in FIG. 3, the lower end portion 52 has a pair of projecting members 53, 53 projecting in a direction perpendicular to the axial direction (longitudinal direction) of the shaft 57 </ b> A (see FIG. 5) on the right side surface and provided at a predetermined interval. I have. The pair of projecting members 53 and 53 are plate-like and have a through hole 56 for weight reduction at the center.

  As shown in FIGS. 8 and 9, the pair of projecting members 53, 53 insert the plate-like portion 60 </ b> A of the third guide member 60 therebetween. The third guide member 60 is a horizontal cross-sectional L-shaped metal member including a flat plate-like portion 60A and a flat plate-like fixing portion 60B extending in a direction orthogonal to the plate-like portion 60A.

  As shown in FIGS. 10 and 11, the third guide member 60 has a fixing portion 60 </ b> B fixed inside the side surface 102 of the head 101. In the third guide member 60, the fixing portion 60 </ b> B is sandwiched between the side surface 102 and the pressing plate 70. The screws 71, 71 fix the third guide member 60 by being screwed into the holding plate 70 from the outside of the side surface 102. The interval between the protruding members 53 and 53 is slightly wider than the thickness of the plate-like portion 60 </ b> A of the third guide member 60. The protruding members 53 and 53 move in the vertical direction along the plate-like portion 60 </ b> A of the third guide member 60. Therefore, the sewing machine 1 can prevent the needle bar linkage 50 from falling to the needle bar 8 side or the opposite side of the needle bar 8 even when the sewing machine motor 3 is rotated at high speed.

  As shown in FIGS. 2 to 4, the first square piece 55 is slidable in the first guide groove 22 </ b> B of the needle bar holder 22. The first square piece 55 transmits the movement of the lower end portion 52 of the needle bar linkage 50 to the needle bar holder 22. The second square piece 54 slides in the second guide groove 81 of the second guide member 80 and guides the lower end portion 52 of the needle bar linkage 50 in the vertical direction.

  The 2nd guide member 80 is demonstrated with reference to FIG.2, FIG6 and FIG.7. The second guide member 80 is disposed on the head 101 in parallel with the motion surface of the needle bar linkage 50 on the front side of the needle bar linkage 50. The second guide member 80 is a substantially rectangular plate-like member that guides the vertical movement of the second square piece 54. The second guide member 80 has a second guide groove 81 which is a rectangular through hole extending in the vertical direction at the center. The lateral width of the second guide groove 81 is slightly larger than the lateral width of the second square piece 54 so that the second square piece 54 can slide in the second guide groove 81. The second guide member 80 guides the lower end portion 52 of the needle bar linkage 50 in the vertical direction by guiding the second square piece 54 in the vertical direction.

  The operation of the sewing machine 1 configured as described above will be described with reference to FIGS. When the sewing machine motor 3 rotates, the upper shaft 4 rotates and the balance crank 30 and the needle bar crank 40 rotate. When the protrusion 41 of the needle bar crank 40 moves circularly on a vertical plane perpendicular to the axis of the upper shaft 4, the upper end 51 of the needle bar linkage 50 moves circularly on a vertical plane parallel to the vertical plane.

  The lower end portion 52 of the needle bar linkage 50 moves up and down as the second square piece 54 slides up and down along the second guide groove 81 of the second guide member 80. The needle bar linkage 50 holds the first square piece 55 inserted into the lower end portion 52 so as to overlap the second square piece 54 by the shaft portion 57. Since the first square piece 55 is inserted into the first guide groove 22B of the needle bar holder 22, the needle bar holder 22 moves up and down when the lower end portion 52 of the needle bar linkage 50 moves up and down. Therefore, the needle bar 8 moves up and down and sewing is performed by the sewing needle 6.

  When zigzag sewing is performed, the swing shaft 5 rotates and the swing lever 15 swings left and right. Since the third triangular piece 17 provided on the shaft 16 of the swing lever 15 is fitted to the connecting portion 14 of the lower end portion 13 of the needle bar base 10, the needle bar base 10 swings left and right about the shaft 12. To do. The needle bar holder 22 swings in the left-right direction together with the needle bar base 10. Accordingly, since the needle bar 8 swings in the left-right direction, the sewing needle 6 swings in the left-right direction and zigzag sewing is performed.

  As described above, in the sewing machine 1 of the present embodiment, the needle bar linkage 50 has the protruding members 53 and 53 at the lower end 52 in the vertical direction along the plate-like portion 60A (see FIG. 8) of the third guide member 60. Move to. Therefore, the third guide member 60 can prevent the needle bar linkage 50 from tilting toward the needle bar 8 side or the opposite side of the needle bar 8.

  In the sewing machine 1 of the present embodiment, the shaft portion 57 that rotatably holds the first square piece 55 and the second square piece 54 has a flange portion 57B. Since the flange portion 57B holds the first square piece 55 and the second square piece 54 between the lower end portions 52, the first square piece 55 and the second square piece 54 move in the axial direction of the shaft portion 57. Can be prevented. Therefore, in the sewing machine 1, the movement of the first square piece 55 and the second square piece 54 causes the front surface of the first square piece 55 to contact the inner surface of the first guide groove 22 </ b> B of the needle bar holder 22 to generate noise. This can be prevented and the durability of the needle bar drive mechanism 2 is improved.

  The needle bar linkage 50 holds the first square piece 55 and the second square piece 54 on the front side of the lower end portion 52 in an overlapping manner. Therefore, in the sewing machine 1, the assembly of the needle bar linkage 50 is easier than in the conventional sewing machine, and the oil supply to the mechanism that requires lubrication of the first square piece 55 and the second square piece 54 is also easy. become.

  In the above embodiment, the swing shaft 5 and the swing lever 15 are examples of “swing means”. The needle bar holder 22 is an example of a “first guide member”. The protruding member 53 is an example of a “projecting portion”.

  The present invention is not limited to the above embodiment, and various modifications can be made. For example, the needle bar linkage 50 forms a pair of projecting members 53, 53 at the lower end portion 52, and inserts the plate-shaped portion 60 </ b> A of the third guide member 60 between the pair of projecting members 53, 53. The sewing machine may have one protruding member 53, a pair of plate-like portions 60A of the third guide member 60 provided at predetermined intervals, and the protruding member 53 inserted between them. The needle bar linkage 50 is provided with the pair of protruding members 53 and 53 on the right side surface of the lower end portion 52, but may be provided on the left side surface of the lower end portion 52.

  The 3rd guide member 60 is not restricted to the horizontal cross-section L shape which consists of plate-shaped part 60A and the fixing | fixed part 60B. The third guide member may be formed in a prismatic shape, and one side surface may be fixed inside the side surface 102 of the head 101.

  The second guide member 80 is not limited to the configuration provided on the front side of the needle bar linkage 50. The second guide member may be provided on the rear side of the needle bar linkage 50. In this case, two shaft portions 57 are provided to sandwich the first square piece 55 and the second square piece 54 with the lower end portion 52, respectively. One shaft portion supports the first square piece 55 sandwiched between the collar portion and the lower end portion. The other shaft portion may be supported by sandwiching the second square piece 54 between the collar portion and the lower end portion.

DESCRIPTION OF SYMBOLS 1 Sewing machine 2 Needle bar drive mechanism 5 Oscillating shaft 8 Needle bar 10 Needle bar base 15 Oscillating lever 21 Needle bar guide member 22 Needle bar holder 22A Needle bar support 22B First guide groove 22C Sliding protrusion 50 Needle bar linkage 50A Shaft portion 51 Upper end portion 51A Bearing built-in portion 51B Screw 52 Lower end portion 53 Projection member 54 Second square piece 55 First square piece 57 Shaft portion 57A Shaft 57B Hook portion 60 Third guide member 60A Plate-like portion 60B Fixing portion 80 First Two guide members 81 Second guide groove 100 Arm 101 Head

Claims (4)

A needle bar base that supports the needle bar so as to be movable in the axial direction of the needle bar;
Rocking means for rocking the needle bar together with the needle bar base in a vertical plane;
In a sewing machine having one end circularly moved in a vertical plane parallel to the vertical plane by a driving force supplied from a driving source, and the other end having a needle bar linkage for driving the needle bar in the axial direction. ,
A first guide member provided integrally with the needle bar and having a first guide groove formed in the swinging direction of the needle bar by the swinging means;
A first square piece that is provided at the other end of the needle bar linkage, moves in the first guide groove, and transmits the movement of the needle bar linkage to the needle bar via the first guide member; ,
A second guide member having a second guide groove formed parallel to the axial direction of the needle bar;
A second square piece provided at the other end of the needle bar linkage, moving in the second guide groove, and guiding the other end of the needle bar linkage along the second guide groove;
A shaft portion having a collar portion, rotatably supporting the first square piece and the second square piece and being fixed to the other end of the needle bar linkage;
A protruding portion provided at the other end of the needle bar linkage to protrude in a direction perpendicular to the extending direction of the shaft portion;
A sewing machine comprising: a third guide member for guiding the needle bar linkage in parallel with an axial direction of the needle bar by guiding the protrusion.   The shaft portion is inserted between the first square piece and the second square piece so as to be sandwiched between the collar portion and the other end of the needle bar linkage. The described sewing machine. The projecting portions are a pair of projecting members provided at the other end of the needle bar linkage so as to project in a direction perpendicular to the extending direction of the shaft portion,
The sewing machine according to claim 1, wherein the third guide member has a plate-like portion that is inserted between the pair of projecting members and extends in parallel with the axial direction of the needle bar.   The sewing machine according to any one of claims 1 to 3, wherein the third guide member is fixed to an arm portion of the sewing machine.

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