JP2013208222A - Sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To move a workpiece to the vertical movement position of a sewing needle and always move the workpiece to a position where the workpiece comes into contact with a needle plate while keeping the shape of the workpiece even when the workpiece is three-dimensional.SOLUTION: In a sewing machine, three-dimensional workpieces 16 and 18 are held by a cloth holding mechanism 10. The cloth holding mechanism 10 holding the workpieces 16 and 18 is moved in a horizontal plane by an X-Y movement mechanism 30. The cloth holding mechanism 10 holding the workpieces 16 and 18 is rotated by wires 20 and 21. In this case, the center of the rotation is located above a needle plate through which a sewing needle for sewing the workpieces 16 and 18 passes vertically.

Description

  The present invention relates to a sewing machine, and more particularly, to a sewing machine that performs sewing in a state in which a sewing object curved in a three-dimensional shape is held.

  2. Description of the Related Art Conventionally, a sewing machine is provided with a driving mechanism for moving a sewing needle up and down and horizontally moving a workpiece (for example, see Patent Document 1). When the sewing product is planar, the sewing machine can be sewn by moving the sewing product horizontally in the XY directions on the same plane by a drive mechanism and moving the sewing needle up and down.

JP 2005-102792 A

  In the sewing machine disclosed in Patent Document 1, in order to form a stitch on the sewing product, the sewing product must always contact the needle plate at the vertical movement position of the sewing needle. However, since the sewing machine described above moves the sewing object within the same horizontal plane, the three-dimensional sewing object such as a curve cannot be moved so as to always contact the needle plate at the vertical movement position of the sewing needle. Therefore, when forming a seam on a three-dimensional sewing object such as a curve, the operator has to move the sewing object manually, which is troublesome.

  An object of the present invention is to provide a feed mechanism capable of always moving a sewing product in contact with a needle plate at a vertical movement position of a sewing needle while maintaining the shape of the sewing product even when the sewing product is three-dimensional. It is to provide a sewing machine equipped with.

  In order to achieve the above object, a sewing machine according to a first aspect of the present invention includes a needle plate having a needle hole through which a sewing needle for sewing a sewing product is inserted, a holding portion for holding the sewing product, and a horizontal plane together with the holding portion. In the sewing machine provided with a first moving part movable in one direction and a moving mechanism for moving the first moving part, the holding part is disposed on the needle plate and is three-dimensionally sewn. A holding plate capable of holding and placing an object in a three-dimensional shape, a support portion to which the holding plate is fixed, and a rotation shaft extending in the one direction and rotatably supporting the holding plate. A rotation mechanism that rotates the support portion around the rotation shaft is provided.

  The sewing machine according to the first aspect of the present invention includes a holding plate that is disposed on the needle plate and that can hold and place a three-dimensional sewing product in a three-dimensional shape. The holding plate is rotatably supported by a rotation shaft. The holding plate is fixed to the support portion, and is rotated around a rotation axis by a rotation mechanism. Therefore, even if the sewing object is three-dimensional, the sewing machine can move the sewing object to the vertical movement position of the sewing needle while maintaining the three-dimensional shape. The sewing machine can always move the sewing product to a position in contact with the needle plate by rotating the holding plate.

  In the sewing machine according to the second aspect of the invention, the holding plate is formed in an arc shape with the rotation axis as the center. In this case, the sewing machine can surely move the sewing product to a position in contact with the needle plate when the sewing product is moved to the vertical movement position of the sewing needle with the holding plate holding the three-dimensional shape.

  In the sewing machine according to a third aspect of the present invention, the rotating mechanism is movable in the one direction together with the first moving part and is movable in the other direction perpendicular to the one direction in a horizontal plane, and the moving mechanism. When the second moving part is moved in the other direction, a connecting mechanism for turning the holding plate around the turning shaft is provided, and the moving mechanism moves the second moving part. In this case, when the second moving unit moves in the other direction orthogonal to one direction by the moving mechanism, the holding plate rotates around the rotation axis. Therefore, the sewing machine can achieve a mechanism for rotating the holding plate around the rotation axis with a simple configuration.

  In the sewing machine according to a fourth aspect of the invention, the coupling mechanism connects one end in the other direction and the other end side from the rotation shaft of the holding portion, and the other end in the other direction and the rotation of the holding portion. It is a pair of cable-shaped parts which connect one end side from a shaft. In this case, the sewing machine can be reliably rotated by guiding the rotating holding portion by the pair of cord-like portions.

  In the sewing machine according to a fifth aspect of the present invention, the holding portion has a shape along the shape of the holding plate, further includes a pressing portion capable of pressing the holding plate, and presses the pressing portion toward the holding plate. A pressing part is provided. In this case, since the sewing machine presses the presser portion having a shape along the shape of the holding plate to the holding plate by the pressing portion, the sewing product on the holding plate can be reliably held.

  In the sewing machine according to a sixth aspect of the invention, the sewing product includes a first sewing product and a second sewing product that is sewn to the first sewing product, and the first sewing product is disposed between the holding plate and the first sewing product. And an auxiliary presser part sandwiched between the two. In this case, the sewing machine can hold the first sewing product and the second sewing product independently.

  According to the present invention, even if the sewing product is three-dimensional, the sewing product can always be moved in contact with the needle plate at the vertical movement position of the sewing needle while maintaining the shape of the sewing product.

It is a perspective view showing the appearance composition of a sewing machine. It is the perspective view which looked at the holding | maintenance part from diagonally forward. It is a top view of a bed part provided with a moving part.

  Hereinafter, an embodiment of a sewing machine according to the present invention will be described with reference to the drawings. The upper side, the lower side, the left side, the right side, the near side, and the back side in FIG. 3 are the rear side, the front side, the left side, the right side, the upper side, and the lower side of the sewing machine 1, respectively. The left-right direction of the sewing machine 1 is the X direction. The front-rear direction of the sewing machine 1 is the Y direction.

  As shown in FIG. 1, the sewing machine 1 includes a bed portion 2, a pedestal column portion 3, and an arm portion 4. The bed unit 2 is placed on a table (not shown). The pedestal 3 is erected upward from the rear end of the bed 2. The arm portion 4 extends forward from the upper end portion of the pedestal column portion 3 so as to face the bed portion 2.

  The pedestal 3 includes a drive motor (not shown) inside. The arm portion 4 includes a needle bar 5 inside the front end portion. The needle bar 5 has a sewing needle 6 attached to its lower end. The needle bar 5 and the sewing needle 6 are driven up and down by a drive motor via a transmission mechanism (not shown). Since a known technique can be applied to the transmission mechanism, detailed description thereof is omitted.

  The bed unit 2 includes a cloth holding mechanism 10 and an XY movement mechanism 30. The cloth holding mechanism 10 holds a three-dimensional sewing object such as a curve on the upper surface of the bed portion 2.

  The cloth holding mechanism 10 will be described with reference to FIG. The cloth holding mechanism 10 includes a Y-axis moving frame 11, a rotation shaft (swing shaft) 12, a shaft support frame 13, a swing bracket 14, a work receiving plate 15, a pair of grips 17, and a pair of grips. A presser bar 19, a pair of wires 20 and 21, a wire guide 22, and a guide plate 24 are provided.

  The Y-axis moving frame 11 is fixed to a Y-direction moving body 36 (see FIG. 3), which will be described later, and is movable in the front-rear direction. The rotating shaft 12 extends in the front-rear direction near the upper end of the Y-axis moving frame 11. The rotation shaft 12 has a base end rotatably supported by the Y-axis moving frame 11 and protrudes forward. The shaft support frame 13 is fixed to the Y-axis moving frame 11 and has a substantially L shape in plan view extending in the front-rear direction. The shaft support frame 13 rotatably supports the front end side of the rotation shaft 12.

  The swing bracket 14 is fixed to the front end of the rotating shaft 12 and swings as the rotating shaft 12 rotates. The guide plate 24 is fixed to the front lower side of the swing bracket 14. The work receiving plate 15 is disposed above the needle plate 8 and fixed to the lower end of the guide plate 24, and places a workpiece to be sewn. The work receiving plate 15 is a curved member having a circular arc shape when viewed from the front centering on the rotation shaft 12. The pair of grips 17 are provided near the left and right ends of the work receiving plate 15 and support the lower workpiece 16 to be pressed against the work receiving plate 15. The pair of pressers 19 is provided near the center of the work receiving plate 15 and supports the upper workpiece 18 to be pressed against the work receiving plate 15. The pair of pressers 19 has a shape that follows the shape of the work receiving plate 15 and is guided by the guide plate 24.

  The wire guide 22 is fixed to the lower end of the swing bracket 14. The wire guide 22 has an arc shape centering on the rotation shaft 12 in front view, supporting one end of each of the wires 20 and 21 at both left and right ends. The pair of wires 20 and 21 swings while guiding the work receiving plate 15 in the left-right direction via the wire guide 22.

  The to-be-sewn product 16 is, for example, a cover material in the vicinity of a shoe heel. The sewing product 18 is a reinforcing cloth for the sewing product 16. The sewing object 16 is three-dimensionally formed in a substantially arc shape in advance. The sewing product 18 has elasticity or shape retention in the shape of the vicinity of the attachment target of the sewing product 16 depending on the material to be applied. Since the workpiece receiving plate 15 is a curved member having a circular arc shape when viewed from the front centering on the rotation shaft 12, the workpiece 16 can be placed in a three-dimensional shape. The sewing machine 1 sews the sewing product 18 to the sewing product 16 while following the shape of the sewing product 16.

  The rotation shaft 12 is a rotation fulcrum (center) around which the workpiece receiving plate 15 rotates (swings) by pulling the wires 20 and 21 as the rotation portions. The rotary shaft 12 is above the needle plate 8 (see FIG. 1) provided with a needle hole (not shown) through which the sewing needle 6 forming a stitch in the sewing products 16 and 18 penetrates in the vertical direction, and the sewing needle 6 Is provided at a position orthogonal to the vertical movement position. The rotation shaft 12 extends in the Y direction.

  The work receiving plate 15 is made of a resin or metal plate, and can be exchanged according to the types of the sewing objects 16 and 18. The workpiece receiving plate 15 is formed with a slit through which the sewing needle 6 penetrates in a vertical direction from between the pair of pressers 19.

  The pair of grips 17 are connected to the left and right side surfaces of the guide plate 24 via air cylinders 25, respectively. When the air cylinder 25 is driven to advance, the grip 17 approaches the workpiece receiving plate 15 and clamps the workpiece 16 in cooperation with the workpiece receiving plate 15. When the air cylinder 25 is driven to retract, the grip 17 is separated from the work receiving plate 15 to release the workpiece 16 from being clamped.

  The presser 19 is fixed to the front end of a presser guide bracket 27 provided on the front side of the guide plate 24. The presser guide bracket 27 is guided in the up-and-down direction by a restricting member 26 fixed to the front surface of the guide plate 24. The presser 19 is moved up and down via a presser guide bracket 27 by driving an air cylinder 28 (see FIG. 1) disposed on the back side of the guide plate 24. When the air cylinder 28 is driven to advance, the presser 19 is lowered in a direction for switching the direction by a link mechanism (not shown) and pressing the work receiving plate 15. The presser 19 holds the workpieces 16 and 18 in cooperation with the work receiving plate 15. The pusher 19 rises in a direction away from the work receiving plate 15 when the air cylinder 28 is driven to retract. That is, the presser 19 moves up and down independently of the grip 17.

  The wire guide 22 is fixed to the back side of the guide plate 24. One end of the wire 20 is fixed to the left end of the rotating shaft 12 of the wire guide 22 and the other end is fixed to the right end of a wire frame 44 described later. One end of the wire 21 is fixed to an end portion on the right side of the rotating shaft 12 of the wire guide 22, and the other end is fixed to a left end portion of a wire frame 45 described later. The wires 20 and 21 transmit power to the wire guide 22 by moving the wire frames 44 and 45 in the left-right direction. The rotating shaft 12 is rotated via the wire guide 22 by the power. The work receiving plate 15 swings through the swing bracket 14 and the guide plate 24 as the rotating shaft 12 rotates.

  The XY movement mechanism 30 will be described with reference to FIG. The XY movement mechanism 30 includes a Y direction movement mechanism 32 and an X direction movement mechanism 33. The Y-direction moving mechanism 32 is disposed in a substantially rectangular bed frame 31 in plan view along the lower shaft 29 extending in the Y direction (front-rear direction), and moves the Y-direction moving body 36 in the Y direction. Let The X direction moving mechanism 33 is located above the Y direction moving mechanism 32 and moves the X direction moving body 52 in the X direction.

  The Y direction moving mechanism 32 will be described. The Y direction moving mechanism 32 includes a Y direction rail member 35, a driven pulley 38, a drive pulley 39, a Y direction timing belt 40, and a Y axis motor 42. The Y-direction rail members 35 are provided in a pair of left and right in a substantially front half portion inside the bed frame 31 and extend parallel to the front-rear direction. Each Y-direction rail member 35 is fixed to the bed frame 31 at both front and rear ends thereof. The Y direction rail member 35 supports the Y direction moving body 36 in a suspended state. The Y-direction moving body 36 has a predetermined width in the front-rear direction and extends in the left-right direction.

  The driven pulley 38 is provided at the front end portion inside the bed frame 31 so as to be rotatable by a support shaft oriented in the left-right direction. The drive pulley 39 is provided on the rear end side in the bed frame 31 so as to be rotatable by a support shaft in the left-right direction. The Y-direction timing belt 40 is a toothed belt having a large number of teeth (not shown) on the inner periphery, and is hung between the driven pulley 38 and the drive pulley 39. A driven gear 41 is fixed to the support shaft of the drive pulley 39. The Y-axis motor 42 is fixed to the right rear part inside the bed frame 31. A drive gear 43 fixed to the drive shaft of the Y-axis motor 42 meshes with the driven gear 41. A part of the Y-direction timing belt 40 is fixed to a part of the Y-direction moving body 36 by a fixing bracket (not shown).

  By driving the Y-axis motor 42, the Y-direction timing belt 40 moves in the Y direction via the driven gear 41, the driving gear 43, the driven pulley 38, and the driving pulley 39. Therefore, the Y-direction moving body 36 moves in the Y direction along the Y-direction rail member 35.

  The X direction moving mechanism 33 will be described. The X direction moving mechanism 33 includes an X direction rail member 50, a driven pulley 53, a drive pulley 55, an X direction timing belt 56, and an X axis motor 58. The X-direction rail member 50 is fixed to the upper surface of the front end portion of the Y-direction moving body 36 and extends in the left-right direction. The X-direction rail member 50 is disposed so that the X-direction moving body 52 can move in the X direction via a slide bearing 51 fitted on the upper side.

  The driven pulley 53 is rotatably supported on the right end side of the Y-direction moving body 36 by a support shaft oriented in the front-rear direction. The drive pulley 55 is rotatably supported on the left end side of the Y-direction moving body 36 by a support shaft in the front-rear direction. The X-direction timing belt 56 is a toothed belt having a large number of teeth (not shown) on the inner periphery, and is hung between the driven pulley 53 and the drive pulley 55. A part of the X-direction timing belt 56 is fixed to a part of the X-direction moving body 52 by a fixing bracket (not shown).

  The X-axis motor 58 is fixed to the left rear part inside the bed frame 31. A drive gear 59 fixed to the drive shaft of the X-axis motor 58 meshes with the driven gear 57. The driven gear 57 connects the left end side of the bed frame 31 to a spline shaft 54 extending in the front-rear direction. The spline shaft 54 engages with the drive pulley 55. The drive pulley 55 moves in the front-rear direction along the spline shaft 54 and rotates together with the spline shaft 54.

  By driving the X-axis motor 58, the X-direction timing belt 56 moves in the X direction via the driven gear 57, the drive gear 59, the spline shaft 54, the driven pulley 53, and the drive pulley 55. Therefore, the X direction moving body 52 moves in the X direction along the X direction rail member 50.

  The Y-axis moving frame 11 is fixed on the upper surface of the Y-direction moving body 36 so that the rotation shaft 12 provided at the upper end is parallel to the Y-axis and the extension line of the axis is perpendicular to the sewing needle 6. It can move in the Y direction integrally with the direction moving body 36.

  Wire frames 44 and 45 for fixing the wires 20 and 21 are fixed to the X-direction moving body 52, respectively. The wire frames 44 and 45 pull the wires 20 and 21 by the movement of the X-direction moving body 52 in the X direction. As described above, the wires 20 and 21 transmit power to the wire guide 22 by the movement of the wire frames 44 and 45 in the left-right direction. The rotating shaft 12 is rotated via the wire guide 22 by the power. As the rotary shaft 12 rotates, the work receiving plate 15 swings about the rotary shaft 12 via the swing bracket 14 and the guide plate 24.

  As described above, in the sewing machine 1 of the present embodiment, the work receiving plate 15 having a circular arc shape when viewed from the front centered on the rotation shaft 12 is rotated (swinged) by the rotation shaft 12 being pulled by the wires 20 and 21. . The rotary shaft 12 is located above the needle plate 8 provided with a needle hole through which the sewing needle 6 forming a stitch in the sewing products 16 and 18 penetrates in the vertical direction and orthogonal to the vertical movement position of the sewing needle 6. Is provided. Therefore, the sewing machine 1 can be placed and moved on the work receiving plate 15 in a state where the shape of the sewing product 16 that is three-dimensionally formed in a substantially arc shape in advance is maintained. The sewing machine 1 can always move the workpieces 16 and 18 to a position in contact with the needle plate 8 when the rotation shaft 12 rotates the workpiece receiving plate 15.

  Wire frames 44 and 45 for fixing the wires 20 and 21 are fixed to the X-direction moving body 52, respectively. The wire frames 44 and 45 pull the wires 20 and 21 by the movement of the X-direction moving body 52 in the X direction. The X-direction moving body 52 moves in the X direction by driving the X-axis motor 58. Therefore, the sewing machine 1 moves the X-direction moving body 52 in the X direction by driving the X-axis motor 58 by a mechanism for rotating (swinging) the work receiving plate 15 by pulling the wires 20 and 21 on the rotating shaft 12. This can be achieved with a simple configuration.

  The sewing machine 1 transmits power to the wire guide 22 when the wires 20 and 21 move in the left-right direction of the wire frames 44 and 45. Therefore, the sewing machine 1 can be reliably swung by the pair of wires 20 and 21 being swung while guiding the work receiving plate 15 in the left-right direction via the wire guide 22.

  The presser 19 is lowered in a direction in which the air cylinder 28 presses the work receiving plate 15 by the advance drive. Therefore, the sewing machine 1 can hold the workpieces 16 and 18 by the presser 19 in cooperation with the work receiving plate 15 and hold them securely. The grip 17 approaches the work receiving plate 15 when the air cylinder 25 is driven to advance, and holds and holds the workpiece 16 in cooperation with the work receiving plate 15. Therefore, the sewing machine 1 can hold the sewing product 16 and the sewing product 18 independently by the presser 19 and the grip 17.

  The cloth holding mechanism 10 corresponds to a “holding portion” of the present invention. The Y-direction moving body 36 corresponds to the “first moving portion” of the present invention. The XY movement mechanism 30 corresponds to the “movement mechanism” of the present invention. The work receiving plate 15 corresponds to the “holding plate” of the present invention. The swing bracket 14 and the guide plate 24 correspond to the “support portion” of the present invention. The wires 20 and 21 correspond to the “connecting mechanism” and “corrugated portion” of the present invention. The presser 19 corresponds to the “presser part” of the present invention. The air cylinder 28 corresponds to the “pressing portion” of the present invention. The sewing products 16 and 18 correspond to the “first sewing product” and the “second sewing product” of the present invention, respectively. The grip 17 corresponds to the “auxiliary presser portion” of the present invention.

  The present invention is not limited to the above embodiment, and various modifications can be made. The wires 20 and 21 may be, for example, string-like. The mechanism for rotating the work receiving plate 15 around the rotation shaft 12 does not have to go through the wires 20 and 21. For example, an actuator for directly rotating the rotation shaft 12 may be provided. The grip 17 may not be provided. In this case, the presser 19 may be used to hold the workpieces 16 and 18 with the work receiving plate 15 alone.

1 sewing machine 8 throat plate 10 cloth holding mechanism (holding part)
12 Rotating shaft 14 Oscillating bracket 15 Work receiving plate (holding plate)
16 Sewing product (first sewing product)
17 Grip (auxiliary presser part)
18 Sewing product (second sewing product)
19 Presser foot (presser foot)
20 wires (connection mechanism)
21 wire (connection mechanism)
24 guide plate 30 XY movement mechanism (movement mechanism)
36 Y-direction moving body (first moving part)
52 X direction moving body (second moving part)

Claims (6)

A needle plate having a needle hole through which a sewing needle for sewing the workpiece is inserted;
A holding part for holding the sewing product;
A first moving part movable together with the holding part in one direction in a horizontal plane;
In a sewing machine comprising a moving mechanism for moving the first moving unit,
The holding part is
A holding plate arranged on the needle plate and capable of holding the three-dimensional sewing object in a three-dimensional shape and placing it;
A support part to which the holding plate is fixed;
A rotation shaft extending in the one direction and rotatably supporting the holding plate;
A sewing machine comprising a turning mechanism for turning the support portion around the turning shaft. The sewing machine according to claim 1, wherein the holding plate is formed in an arc shape with the rotation axis as a center. The rotation mechanism is
A second moving part movable in the one direction together with the first moving part and movable in another direction orthogonal to the one direction in a horizontal plane;
A connection mechanism for rotating the holding plate around the rotation shaft when the second moving portion is moved in the other direction by the moving mechanism;
The sewing machine according to claim 1, wherein the moving mechanism moves the second moving unit. The coupling mechanism is
A pair of cords connecting one end in the other direction and the other end side from the rotating shaft of the holding portion, and connecting the other end in the other direction and one end side from the rotating shaft of the holding portion. The sewing machine according to claim 3, wherein the sewing machine is a part. The holding part is
It has a shape along the shape of the holding plate, further comprising a presser part that can press the holding plate,
The sewing machine according to any one of claims 1 to 4, further comprising a pressing portion that presses the pressing portion toward the holding plate. The sewing product is
A first sewing product and a second sewing product sewn on the first sewing product,
The sewing machine according to any one of claims 1 to 5, further comprising an auxiliary presser that holds the first sewing product with the holding plate.

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