Sewing machine mechanism

Abstract

The invention provides a sewing machine mechanism which can restrain cost and realize low noise. The sewing machine mechanism comprises: a switching mechanism for switching a needle bar for sewing among a pair of needle bars provided in the sewing machine to two or any one of the needle bars; a single-needle releasing mechanism which releases the switching mechanism to enable the two needle bars to perform double-needle sewing under the condition that one needle bar performs single-needle sewing, and a single-needle releasing mechanism which performs double-needle sewing under the condition that any one needle bar performs single-needle sewing; the presser foot lifting mechanism is used for lifting the cloth presser foot to which the force is applied downwards; and a cam mechanism. The cam mechanism is provided with an eccentric cam which rotates around a fulcrum shaft through a motor, a presser foot lifting contact which is supported by the presser foot lifting mechanism and abuts against the periphery of the eccentric cam, and a single-needle releasing contact which is supported by the single-needle releasing mechanism and abuts against the periphery of the eccentric cam. The sewing machine mechanism operates the presser foot raising mechanism via the presser foot raising contact and operates the single-needle releasing mechanism via the single-needle releasing contact based on the rotation position of the eccentric cam.

Description

Technical Field

[0001] The invention relates to a sewing machine mechanism. Background Art

[0002] In a double-needle sewing machine that uses the position of a switching lever to switch between driving either one needle bar or both needle bars, a single needle release mechanism is disclosed that releases the single needle state by pulling a reset plate with a solenoid (for example, see Patent Document 1). On the other hand, a presser foot lifting mechanism is disclosed, which has: a presser foot bar that holds a fabric presser foot; a presser foot spring that applies downward pressing pressure to the fabric presser foot via the presser foot bar; a rod that overcomes the presser foot spring and applies an upward movement to the presser foot bar; and a solenoid that applies an upward movement to the rod via a plurality of connecting rods (for example, see Patent Document 2).

[0003] [Prior art literature]

[0004] [Patent Document]

[0005] [Patent Document 1] Chinese Patent Application Publication No. 106948094

[0006] [Patent Document 2] Japanese Patent Application Publication No. 2011-092523 Summary of the invention

[0007] [Problems to be solved by the invention]

[0008] In addition, the single needle release mechanism of Patent Document 1 and the presser foot lifting mechanism of Patent Document 2 are both driven by a solenoid. However, when such a single needle release mechanism and a presser foot lifting mechanism are applied to a double needle sewing machine, two solenoids are required accordingly, so there are problems such as noise during operation of the solenoids and increased costs.

[0009] An object of an aspect of the present invention is to suppress costs and achieve low noise in a double-needle sewing machine having a single needle releasing mechanism and a presser foot lifting mechanism.

[0010] [Technical means to solve the problem]

[0011] According to a form of the present invention, a sewing machine mechanism is provided, the sewing machine mechanism comprising: a switching mechanism for switching a pair of needle bars provided in the sewing machine for sewing to two needle bars or any one of the needle bars; a single needle releasing mechanism for releasing the switching mechanism when any one of the needle bars is in a state of single-thread sewing and setting the state of double-thread sewing to be performed by the two needle bars; a presser foot lifting mechanism for lifting a presser foot of a fabric which is forced downward; and a cam mechanism, the cam mechanism comprising: an eccentric cam which is rotated around a support shaft by a motor, a presser foot lifting contact which is supported by the presser foot lifting mechanism and abuts against the outer periphery of the eccentric cam, and a single needle releasing contact which is supported by the single needle releasing mechanism and abuts against the outer periphery of the eccentric cam, the sewing machine mechanism operates the presser foot lifting mechanism via the presser foot lifting contact based on the rotational position of the eccentric cam, and operates the single needle releasing mechanism via the single needle releasing contact.

[0012] [Effects of the Invention]

[0013] According to the aspect of the present invention, it is possible to suppress costs and realize low noise in a double-needle sewing machine having a single needle releasing mechanism and a presser foot lifting mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a perspective view showing the front side of the sewing machine mechanism of this embodiment.

[0015] Figure 2 It is a perspective view showing the back side of the sewing machine mechanism of this embodiment.

[0016] Figure 3 It is a front view showing the sewing machine mechanism of this embodiment.

[0017] Figure 4 It is a rear view showing the sewing machine mechanism of this embodiment.

[0018] Figure 5 It is a left side view showing the sewing machine mechanism of this embodiment.

[0019] Figure 6 It is a three-dimensional view showing a part of the sewing machine mechanism of the present embodiment as viewed from the upper left front.

[0020] Figure 7 It is a left side view showing a part of the sewing machine mechanism of this embodiment.

[0021] Figure 8 It is a front view showing the eccentric cam of this embodiment.

[0022] Fig. 9 It means by Figure 8A front view of the sewing machine mechanism showing the action of the eccentric cam.

[0023] Fig.10 This is a diagram showing the eccentric cam of the present embodiment when viewed from the rear.

[0024] Fig.11 It means by Fig.10 A front view of the sewing machine mechanism showing the action of the eccentric cam.

[0025] Fig.12 This is a diagram showing the eccentric cam of the present embodiment when viewed from the rear.

[0026] Fig.13 It means by Fig.12 A front view of the sewing machine mechanism showing the action of the eccentric cam.

[0027] Fig.14 This is a diagram showing the eccentric cam of the present embodiment when viewed from the rear.

[0028] Fig.15 It means by Fig.14 A front view of the sewing machine mechanism showing the action of the eccentric cam.

[0029] [Explanation of Symbols]

[0030] 1: Sewing machine mechanism

[0031] 10: Needle bar mechanism

[0032] 11: Support frame

[0033] 12, 12A, 12B: Needle bar

[0034] 13, 13A, 13B: stitches

[0035] 14: Needle bar holding part

[0036] 15, 15A, 15B: Clutch mechanism

[0037] 16: Stopper mechanism

[0038] 17: Switch widget

[0039] 20: Switching mechanism

[0040] 21: Switching lever

[0041] 21A: Grip

[0042] 21B: snap-on screw

[0043] 22: Rod shaft

[0044] 23: Switching arm

[0045] 24: Switchboard

[0046] 24A: Long hole

[0047] 24B: Support screw

[0048] 24C: Clamping plate

[0049] 25: Neutral maintenance agency

[0050] 25A: Base

[0051] 25B: Switching spring

[0052] 26: Leaf spring

[0053] 30: Fabric presser foot

[0054] 31: Presser foot bar

[0055] 32: Rod holding part

[0056] 32A: protrusion

[0057] 33: Presser foot spring

[0058] 40: Presser foot lifting mechanism

[0059] 41: Push up component

[0060] 41A: Hook

[0061] 42: Driven connecting rod

[0062] 42A: Support shaft

[0063] 43: Connecting rod

[0064] 44: Active connecting rod

[0065] 44A: Support shaft

[0066] 50: Single needle release mechanism

[0067] 51: Mounting plate

[0068] 51A: Support screw

[0069] 52: Release lever

[0070] 52A: Side edge

[0071] 52B: Side edge

[0072] 52C: Long hole

[0073] 52D: Incision

[0074] 53: Elastic component

[0075] 54: Driven link (second release lever)

[0076] 54A: Support shaft

[0077] 55: Connecting shaft

[0078] 56: Connecting plate

[0079] 56A: Long hole

[0080] 56B: Support screw

[0081] 56C: Long hole

[0082] 56D: Shaft

[0083] 57: Active connecting rod

[0084] 57A: Support shaft

[0085] 57B: Long hole

[0086] 60: Cam mechanism

[0087] 61: Eccentric cam

[0088] 61A: Support shaft

[0089] 62: Presser foot lift contact

[0090] 63: Single pin release contact

[0091] 64A: First presser foot lifting interval

[0092] 64B: Second presser foot lifting section

[0093] 64C: Presser foot lift hold zone

[0094] 64D: No functional area

[0095] 64E: Single needle release interval

[0096] 64F: No function area

[0097] 70: Motor

[0098] 71: Motor mounting plate DETAILED DESCRIPTION

[0099] Hereinafter, the embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited thereto. The structural components of the embodiments described below can be appropriately combined. In addition, some structural components may not be used.

[0100] In the present embodiment, a local coordinate system is defined for the sewing machine mechanism 1. In the following description, the local coordinate system defined for the sewing machine mechanism 1 is appropriately referred to as the sewing machine coordinate system. The sewing machine coordinate system is defined by the XYZ orthogonal coordinate system. In the present embodiment, the positional relationship of each part is described based on the sewing machine coordinate system. The direction parallel to the X-axis in the specified plane is set as the X-axis direction. The direction parallel to the Y-axis in the specified plane orthogonal to the X-axis is set as the Y-axis direction. The direction parallel to the Z-axis orthogonal to the specified plane is set as the Z-axis direction. In addition, in the present embodiment, the plane containing the X-axis and the Y-axis is appropriately referred to as the XY plane. The plane containing the X-axis and the Z-axis is appropriately referred to as the XZ plane. The plane containing the Y-axis and the Z-axis is appropriately referred to as the YZ plane. The XY plane is parallel to the specified plane. The XY plane, the XZ plane, and the YZ plane are orthogonal. In addition, in the present embodiment, the XY plane is set to be parallel to the horizontal plane. The Z-axis direction is the up-down direction. The +Z direction is the up direction, and the -Z direction is the down direction. Furthermore, the XY plane may also be tilted relative to the horizontal plane.

[0101] [Sewing machine mechanism]

[0102] Figure 1 It is a perspective view showing the front side of the sewing machine mechanism 1 according to the present embodiment. Figure 2 It is a perspective view showing the back side of the sewing machine mechanism 1 according to the present embodiment. Figure 3 It is a front view showing the sewing machine mechanism 1 of this embodiment. Figure 4 It is a rear view showing the sewing machine mechanism 1 of this embodiment. Figure 5 This is a left side view showing a sewing machine mechanism 1 of the present embodiment. The sewing machine mechanism 1 is provided inside a sewing machine frame included in the sewing machine.

[0103] The sewing machine described as the present embodiment is a so-called lockstitch sewing machine, and is a so-called double-needle sewing machine having two sewing needles 13A and 13B. In the following description, the characteristic sewing machine mechanism 1 of the present invention is mainly described, and the needle up-and-down moving mechanism, cloth feeding mechanism, shuttle mechanism, thread adjusting device, balance mechanism, thread cutting device, etc. of a general lockstitch sewing machine are regarded as including the same structure as the well-known structure and the description is omitted.

[0104] The sewing machine mechanism 1 includes: a needle bar mechanism 10 of a double-needle sewing machine, a switching mechanism 20 for switching the double-needle state and any single-needle state of the needle bar mechanism 10, a cloth presser foot 30 for pressing a sewing object during sewing, a presser foot lifting mechanism 40 for raising and lowering the cloth presser foot 30, a single-needle releasing mechanism 50 for releasing the single-needle state of the needle bar mechanism 10, a cam mechanism 60 for operating the presser foot lifting mechanism 40 and the single-needle releasing mechanism 50, and a motor 70 for driving the cam mechanism 60.

[0105] The needle bar mechanism 10 is provided at the head portion of the front end side (-X side) of the horizontal arm portion along the X-axis direction inside the sewing machine frame on which the sewing machine mechanism 1 is mounted. The needle bar mechanism 10 comprises: a support frame 11, a needle bar 12, a sewing needle 13, a needle bar holding portion 14, a clutch mechanism 15, a stopper mechanism 16, and a switching member 17. The support frame 11 is fixed to the sewing machine frame.

[0106] The needle bar 12 includes a pair of needle bars 12A and 12B. The needle bars 12A and 12B are arranged in the X-axis direction and supported by the support frame 11 in a manner along the Z-axis direction. The needle bars 12A and 12B can move up and down in the Z-axis direction within a predetermined range while being supported by the support frame 11 in a manner along the Z-axis direction.

[0107] The sewing needle 13 includes a pair of sewing needles 13A and 13B. The sewing needle 13A is held at the lower end of the needle bar 12A. In addition, the sewing needle 13B is held at the lower end of the needle bar 12B. The sewing needles 13A and 13B are held at the same height at the lower ends when the needle bars 12A and 12B are at the same height.

[0108] The needle bar holding part 14 supports the pair of needle bars 12A and 12B respectively via the clutch mechanism 15. The needle bar holding part 14 is moved up and down in the Z-axis direction by a needle bar up and down moving mechanism that transmits the rotational driving force of a sewing machine motor (not shown) as a driving source for moving the needle bar 12 up and down.

[0109] The clutch mechanism 15 is supported by the needle bar holding portion 14 and moves up and down in the Z-axis direction together with the needle bar holding portion 14. The clutch mechanism 15 includes a pair of clutch mechanisms 15A and 15B. The clutch mechanism 15A releases the needle bar 12A at the top dead center of the needle bar holding portion 14 when the switching member 17 described later is located at a predetermined first position. In addition, the clutch mechanism 15B releases the needle bar 12B at the top dead center of the needle bar holding portion 14 when the switching member 17 described later is located at a predetermined second position.

[0110] The clutch mechanism 15A returns to a state of holding the needle bar 12A when reaching the top dead center when the switching member 17 described later is located at a predetermined release position while the needle bar 12A is released. The clutch mechanism 15B returns to a state of holding the needle bar 12B when reaching the top dead center when the switching member 17 described later is located at a predetermined release position while the needle bar 12B is released.

[0111] The stopper mechanism 16 is supported by the support frame 11. When the switching member 17 described later is located at a predetermined first position, the stopper mechanism 16 holds the needle bar 12A released by the clutch mechanism 15A at the top dead center of the needle bar holding portion 14. Thus, the needle bar 12A is held by the support frame 11 at the top dead center position. In addition, when the switching member 17 described later is located at a predetermined second position, the stopper mechanism 16 holds the needle bar 12B released by the clutch mechanism 15B at the top dead center of the needle bar holding portion 14. Thus, the needle bar 12B is held by the support frame 11 at the top dead center position.

[0112] When the stopper mechanism 16 holds the needle bar 12A, if the switching member 17 described later moves to a predetermined release position, the clutch mechanism 15A returns to the state of holding the needle bar 12A when reaching the top dead center, and the stopper mechanism 16 releases the needle bar 12A. In addition, when the stopper mechanism 16 holds the needle bar 12B, if the switching member 17 described later moves to a predetermined release position, the clutch mechanism 15B returns to the state of holding the needle bar 12B when reaching the top dead center, and the stopper mechanism 16 releases the needle bar 12B.

[0113] The switching member 17 is supported by the support frame 11 in a state that it can slide in the X-axis direction at a position closer to the +Z side than the needle bar holding portion 14. As described above, the switching member 17 can slide in the X-axis direction between the first position, in which the needle bar 12A located at the top dead center is released by the clutch mechanism 15A and held by the stopper mechanism 16, the second position, and the release position, in which the retention by the stopper mechanism 16 is released and the needle bar 12A and the needle bar 12B are held by the clutch mechanism 15B and the clutch mechanism 15B, respectively.

[0114] By moving the switching member 17 to the first position, the state in which the vertical movement of the needle bar 12A is stopped and sewing is performed by only the single needle of the needle bar 12B can be switched. By moving the switching member 17 to the second position, the state in which the vertical movement of the needle bar 12B is stopped and sewing is performed by only the single needle of the needle bar 12A can be switched. By moving the switching member 17 to the release position, the state in which sewing is performed by two needles of the needle bar 12A and the needle bar 12B can be switched.

[0115] The switching mechanism 20 is a mechanism for positioning the switching member 17 of the needle bar mechanism 10 at the first position, the second position, and the release position. The switching mechanism 20 switches the needle bar 12 used for sewing in the needle bar mechanism 10 of the double-needle sewing machine by moving the switching member 17 to a predetermined position in the X-axis direction. The switching mechanism 20 includes a switching lever 21, a lever shaft 22, a switching arm 23, a switching plate 24, a neutral holding mechanism 25, and a leaf spring 26.

[0116] The switching lever 21 is provided on the front side (-Y side) of the sewing machine mechanism 1 and is operated by an operator who sews using a double-needle sewing machine. The switching lever 21 is a plate material that is bent toward the -X side near the center portion in such a manner that the long side direction from one end on the +Z side to the curved portion is roughly along the Z-axis direction, and the long side direction from the curved portion to the other end is roughly along the X-axis direction. The switching lever 21 has a gripping portion 21A at the other end that is gripped by the operator when operating. On the surface on the +Y side of the switching lever 21 that is closer to the curved portion side than the gripping portion 21A, there is installed a locking screw 21B that engages with the release lever 52 of the single needle release mechanism 50 described later when the switching operation is performed.

[0117] The rod shaft 22 is a cylindrical shaft member extending in the Y-axis direction and is supported on the sewing machine frame so as to be rotatable around the Y-axis. One end of the rod shaft 22 on the -Y side is connected to one end of the switching lever 21 on the +Z side. The rod shaft 22 rotates around the Y-axis by the swing of the switching lever 21.

[0118] The switching arm 23 is a member provided on the back side (+Y side) of the sewing machine mechanism 1 and extending in the Z-axis direction. One end of the switching arm 23 on the +Z side is connected to the other end of the rod shaft 22 on the +Y side, and rotates coaxially with the rod shaft 22 and in the same direction as the rod shaft 22 through the rotation of the rod shaft 22 around the Y-axis.

[0119] The switching plate 24 is a plate that is provided on the back side (+Y side) of the sewing machine mechanism 1 and extends in the X-axis direction. One end of the switching plate 24 on the +X side is supported to be able to rotate around the Y-axis at the other end on the -Z side of the switching arm 23. A long hole 24A having a long side direction in the X-axis direction is formed at the other end on the -X side of the switching plate 24. A support screw 24B is inserted into the long hole 24A. The support screw 24B is fixed to the sewing machine frame, and supports the switching plate 24 to be able to move in the X-axis direction via the long hole 24A.

[0120] The switching plate 24 has a clamping plate portion 24C bent toward the +Y side near one end on the +X side. The clamping plate portion 24C is always urged from the +X side and the -X side by the neutral holding mechanism 25 described later. Thus, the switching plate 24 is always urged from the +X side and the -X side by the neutral holding mechanism 25 described later.

[0121] The neutral holding mechanism 25 is a mechanism for maintaining the neutral posture of the switching arm 23. The neutral holding mechanism 25 includes: a base 25A fixed to the sewing machine frame, and a pair of switching springs 25B supported by the base 25A. The base 25A includes a pair of plates arranged opposite to each other in the X-axis direction, and a pair of switching springs 25B are supported between the pair of plates. The switching spring 25B is a compression spring that applies an applied force in the direction along the X-axis direction. One end of the +X side of one of the switching springs 25B is fixed to the base 25A, and the other end of the -X side applies force to the surface of the +X side of the clamping plate portion 24C in the -X direction. One end of the -X side of the other switching spring 25B is fixed to the base 25A, and the other end of the +X side applies force to the surface of the -X side of the clamping plate portion 24C in the +X direction.

[0122] The leaf spring 26 is a plate material provided on the side of the head side (-X side) of the sewing machine mechanism 1 and extending in the Y-axis direction. One end of the leaf spring 26 on the +Y side is connected to the other end on the -X side of the switching plate 24. The leaf spring 26 moves in the X-axis direction as the switching plate 24 moves in the X-axis direction. The other end on the -Y side of the leaf spring 26 engages with the switching member 17 of the needle bar mechanism 10. The leaf spring 26 pushes the switching member 17 in the moving direction with the other end on the -Y side as it moves in the X-axis direction.

[0123] The leaf spring 26 can be bent around the Z axis with one end on the +Y side connected to the switching plate 24 as a fulcrum. The movement of the switching member 17 in the X-axis direction is sometimes restricted depending on the position of the needle bars 12A and 12B when the needle bars 12A and 12B move up and down. In this case, the leaf spring 26 is bent, and the switching member 17 is moved at the moment when the restriction on the movement of the switching member 17 in the X-axis direction is released.

[0124] The cloth presser foot 30 is a member disposed around the sewing needles 13A and 13B and used to press the sewing object at the sewing position from above. The cloth presser foot 30 holds the sewing object between it and the upper surface of the iron plate supporting the sewing object. The cloth presser foot 30 is a so-called boat-shaped presser foot with a smooth bottom surface and an upstream side (-Y side) in the cloth feeding direction tilted upward.

[0125] The cloth presser foot 30 is held at the lower end of a presser bar 31 extending in the Z-axis direction. The presser bar 31 is supported on the sewing machine frame so as to be movable up and down in the Z-axis direction. A bar holding portion 32 is fixed to the upper end of the presser bar 31. The bar holding portion 32 is urged downward (in the -Z direction) by a presser spring 33 disposed above the presser bar 31. The bar holding portion 32 has a protrusion 32A protruding toward the +Y side. The protrusion 32A is engaged with an upward push member 41 of a presser foot lifting mechanism 40 described later, and is given an upward push force upward (in the +Z direction).

[0126] The presser foot lifting mechanism 40 is a mechanism for changing the height position of the cloth presser foot 30. The presser foot lifting mechanism 40 is operated by a cam mechanism 60 and a motor 70 described later. The presser foot lifting mechanism 40 includes a push-up member 41, a driven link 42, a connecting rod 43, and a driving link 44.

[0127] The push-up member 41 is a hook-shaped plate that is bent downward (-Z side) when viewed in the Y-axis direction, and is configured so that the hook portion 41A holds up the protrusion 32A of the rod holding portion 32. By pulling the push-up member 41 upward (+Z side), the presser bar 31 and the cloth presser foot 30 are pulled up through the rod holding portion 32.

[0128] The driven connecting rod 42 is a so-called bell crank, and is supported on the sewing machine frame so as to be rotatable around the Y-axis by a support shaft 42A extending in the Y-axis direction. The driven connecting rod 42 includes two arms in two directions toward the radially outer side centered on the support shaft 42A. One of the arms extends to the -X side, and its front end is connected to the upper end of the push-up member 41 so as to be rotatable around the Y-axis. The other arm extends to the +Z side, and its front end is connected to one end of the -X side of the connecting rod 43 so as to be rotatable around the Y-axis.

[0129] The connecting rod 43 is a rod extending substantially in the X-axis direction. The connecting rod 43 connects the driven link 42 and the active link 44 via one end on the +X side and the other end on the −X side.

[0130] The active connecting rod 44 is a so-called bell crank, and is supported on the sewing machine frame so as to be rotatable around the Y axis by a support shaft 44A extending in the Y axis direction. The active connecting rod 44 includes two arms in two directions toward the radially outer side centered on the support shaft 44A. One of the arms extends to the -Z side, and its front end is connected to the other end of the +X side of the connecting rod 43 so as to be rotatable around the Y axis. The other arm extends to the +X side, and supports the presser foot lifting contact 62 of the cam mechanism 60 described later at its front end.

[0131] The single needle release mechanism 50 is a mechanism for releasing the state in which a single needle is sewn by any one of the needle bars 12, and making the state in which double needles are sewn by the needle bars 12A and 12B. The single needle release mechanism 50 includes a mounting plate 51, a release lever 52, an elastic member 53, a driven link 54, a connecting shaft 55, a connecting plate 56, and an active link 57.

[0132] Figure 6 It is a perspective view showing a part of the sewing machine mechanism 1 of the present embodiment, as seen from the upper left front. Figure 7 It is a left side view showing a part of the sewing machine mechanism 1 of this embodiment.

[0133] The mounting plate 51 is fixed to the sewing machine frame. The mounting plate 51 is a plate whose central portion extends in the Y-axis direction in a horizontal posture, and whose end on the -Y side is bent to have a flat portion parallel to the XZ plane, and whose other end on the +Y side is bent in an L shape toward the +Z side. One end of the mounting plate 51 on the -Y side is located closer to the +Y side than the switching lever 21.

[0134] The release lever 52 is a plate extending in the Y-axis direction in a horizontal posture, and one end of the -Y side is bent in an L-shape toward the -Z side. The release lever 52 is supported on the -Z side of the central part of the mounting plate 51 so as to be movable in the Y-axis direction. A long hole 52C having a long side direction in the Y-axis direction is formed in the horizontal posture part of the release lever 52. A support screw 51A is inserted into the long hole 52C. The support screw 51A is fixed to the mounting plate 51, and supports the release lever 52 through the long hole 52C so as to be movable in the Y-axis direction.

[0135] One end of the -Y side of the release lever 52 is located closer to the -Y side than one end of the -Y side of the mounting plate 51 and closer to the +Y side than the switching lever 21. The release lever 52 is urged toward the -Y side by the elastic member 53. The release lever 52 abuts against the engagement screw 21B provided on the surface of the switching lever 21 on the +Y side, thereby maintaining the position of the switching lever 21 to rotate.

[0136] Specifically, by operating the grip 21A of the switching lever 21 toward the -X side, the switching lever 21 is moved to the -X side. Figure 3 , the locking screw 21B moves toward the -X side of the release lever 52. When the locking screw 21B moves to the -X side closer to the -X side than the side edge 52A on the -X side of the release lever 52, the release lever 52 abuts against the surface on the +Y side of the switching lever 21 (maintains the position) by the force applied in the -Y direction by the elastic member 53. At this time, the locking screw 21B abuts against the side edge 52A of the release lever 52, thereby preventing it from returning to its original position. In the state where the locking screw 21B abuts against the side edge 52A, the switching member 17 is maintained in the first position, thereby maintaining the state where the up and down movement of the needle bar 12A is stopped and sewing is performed by only the single needle of the needle bar 12B.

[0137] In addition, by operating the grip portion 21A of the switching lever 21 toward the +X side, the switching lever 21 is moved to the +X side. Figure 3, the locking screw 21B moves toward the +X side of the release lever 52. When the locking screw 21B moves to the +X side closer to the +X side than the side edge 52B on the +X side of the release lever 52, the release lever 52 abuts against the surface on the +Y side of the switching lever 21 (maintains the position) by the force applied in the -Y direction by the elastic member 53. At this time, the locking screw 21B abuts against the side edge 52B of the release lever 52, thereby preventing it from returning to its original position. In the state where the locking screw 21B abuts against the side edge 52B, the switching member 17 is maintained in the second position, thereby maintaining the state where the up and down movement of the needle bar 12B is stopped and sewing is performed by only the single needle of the needle bar 12A.

[0138] When the release lever 52 overcomes the force applied in the -Y direction by the elastic member 53 and moves in the +Y direction (release position), the restriction of the side edge portion 52A or the side edge portion 52B on the engaging screw 21B is released, and the switching lever 21 returns to the original position through the neutral holding mechanism 25. At the position where the switching lever 21 returns, the switching member 17 is maintained in the release position, thereby maintaining the state of sewing by the two needles of the needle bar 12A and the needle bar 12B.

[0139] The release lever 52 has a notch 52D formed at the edge of the -X side at the other end on the +Y side, which is V-shaped when viewed in the Z-axis direction. The notch 52D is formed so that the edge on the +Y side is inclined from the -X side toward the +X side and from the +Y side toward the -Y side. The driven link 54 described later is inserted through the notch 52D in the Z-axis direction, and the edge of the notch 52D is pushed in the +X direction by the driven link 54 as the driven link 54 moves. Since the edge is inclined, it is pushed in the +Y direction by the driven link 54 in the +X direction. The release lever 52 moves in the +Y direction via the notch 52D as the driven link 54 moves. The release lever 52 is pulled in the +Y direction by the driven link 54 via the notch 52D to return the switching lever 21 to its original position, but the operator can also manually push one end of the -Y side in the +Y direction to return the switching lever 21 to its original position.

[0140] The elastic member 53 urges the release lever 52 toward the -Y side, i.e., the switching lever 21 side, relative to the mounting plate 51. The elastic member 53 is a compression spring disposed between the -Y side surface of the flat portion of the -Y side of the mounting plate 51 and the +Y side surface of one end of the release lever 52 at the -Y side.

[0141] The driven connecting rod 54, the connecting shaft 55, the connecting plate 56, and the active connecting rod 57 are arranged on the back side (+Y side) of the sewing machine mechanism 1. The driven connecting rod 54 is a so-called double-arm crank, which is supported on the sewing machine frame so as to be rotatable around the Y-axis by a support shaft 54A extending in the Y-axis direction. The driven connecting rod 54 includes two arms in two directions toward the radial outer side centered on the support shaft 54A. One of the arms extends to the -Z side, and its front end is inserted into the cutout 52D of the release lever 52. The other arm extends to the +Z side, and its front end is connected to the connecting shaft 55 extending in the Y-axis direction. Regarding the driven connecting rod 54, on the support shaft 54A, the front end (lower end) of one of the arms is subjected to a rotational force in a direction away from the cutout 52D toward the -X direction.

[0142] The connecting shaft 55 is a cylindrical shaft member extending in the Y-axis direction, and rotates in the same direction as the driven link 54 as the driven link 54 rotates about the support shaft 54A.

[0143] The connecting plate 56 is a plate extending in the X-axis direction. A long hole 56A having a long side direction in the X-axis direction is formed in the central part of the long side direction of the connecting plate 56. A support screw 56B is inserted into the long hole 56A. The support screw 56B is fixed to the sewing machine frame, and supports the connecting plate 56 to be movable in the X-axis direction through the long hole 56A. A long hole 56C having a long side direction in the Z-axis direction is formed at one end on the -X side of the connecting plate 56. A connecting shaft 55 is inserted into the long hole 56C. The long hole 56C holds the connecting shaft 55. As the connecting plate 56 moves in the X-axis direction, the connecting shaft 55 moves in the X-axis direction through the long hole 56C, causing the driven connecting rod 54 to rotate around the Y-axis with the support shaft 54A as the center. A cylindrical shaft portion 56D extending in the Y-axis direction is formed at one end on the +X side of the connecting plate 56.

[0144] The active link 57 is a so-called bell crank, and is supported on the sewing machine frame so as to be rotatable about the Y axis by a support shaft 57A extending in the Y axis direction. The active link 57 has a long side direction in the Z axis direction, and is bent in the center to bulge toward the -X side. The active link 57 includes a support shaft 57A at one end on the +Z side. A long hole 57B having a long side direction in the Z axis direction is formed in the bent portion of the active link 57. The shaft portion 56D of the connecting plate 56 is inserted into the long hole 57B. When the active link 57 is turned to Figure 4 When the connecting plate 56 rotates counterclockwise in the -X axis direction, the connecting plate 56 moves in the -X axis direction via the shaft portion 56D held by the long hole 57B. The active link 57 supports a single-needle release contactor 63 of a cam mechanism 60 described later at the other end on the -Z side.

[0145] The cam mechanism 60 is a mechanism for operating the presser foot lifting mechanism 40 and the single needle releasing mechanism 50. The cam mechanism 60 includes an eccentric cam 61, a presser foot lifting contact 62, and a single needle releasing contact 63.

[0146] The eccentric cam 61 is a flat cam in which a support shaft 61A extending in the Y-axis direction is coaxially connected to the output shaft of the motor 70. The eccentric cam 61 is pressed against the presser foot lifting contact 62 on the +Z side of the outer periphery and is pressed against the single needle release contact 63 on the -X side of the outer periphery. The radial distance from the support shaft 61A to the outer periphery of the eccentric cam 61 changes according to the rotation angle. The outer periphery of the eccentric cam 61 at each rotation angle abuts against the presser foot lifting contact 62 or the single needle release contact 63, thereby causing either the presser foot lifting mechanism 40 or the single needle release mechanism 50 to operate. Their operations will be described in detail later.

[0147] The presser foot lifting contact member 62 is supported by the active link 44 so as to be rotatable about the Y axis and is configured as a roller member that contacts the +Z side of the outer periphery of the eccentric cam 61. As described above, the presser foot 30 and the presser foot bar 31 are urged downward (in the -Z direction) by the presser foot spring 33. As a result, the driven link 42 is supported via the push-up member 41. Figure 3 Furthermore, the active link 44 is given a clockwise rotational force via the connecting rod 43. As a result, the presser foot lifting contact piece 62 is pressed against the outer periphery of the eccentric cam 61.

[0148] The single-needle release contact 63 is supported by the active link 57 so as to be rotatable about the Y axis and is arranged as a roller member that abuts against the -X side of the outer periphery of the eccentric cam 61. As described above, the driven link 54 is centered on the support shaft 54A. Figure 4 The connecting plate 56 is thus subjected to a force in the +X direction via the connecting shaft 55. Furthermore, the active link 57 is given a clockwise rotational force via the shaft portion 56D of the connecting plate 56. As a result, the single-needle release contact 63 is pressed against the outer periphery of the eccentric cam 61.

[0149] The motor 70 is fixed to a motor mounting plate 71 of the sewing machine frame. The motor 70 is a stepping motor serving as a driving source for the cam mechanism 60. The motor 70 has an output shaft extending in the Y-axis direction and coaxially connected to the support shaft 61A of the eccentric cam 61.

[0150] [Operation of the sewing machine mechanism]

[0151] Figure 8 , Fig.10 , Fig.12 , Fig.14 It is a front view showing the eccentric cam 61 of this embodiment. Fig. 9 It means by Figure 8The front view of the operation of the sewing machine mechanism 1 performed by the eccentric cam 61 is shown. Fig.11 It means by Fig.10 The front view of the operation of the sewing machine mechanism 1 performed by the eccentric cam 61 is shown. Fig.13 It means by Fig.12 The front view of the operation of the sewing machine mechanism 1 performed by the eccentric cam 61 is shown. Fig.15 It means by Fig.14 The front view of the operation of the sewing machine mechanism 1 performed by the eccentric cam 61 is shown.

[0152] like Figure 8 As shown, the eccentric cam 61 has a first presser foot lifting interval 64A, a second presser foot lifting interval 64B, a presser foot lifting and holding interval 64C, a non-functional interval 64D, a single needle release interval 64E, and a non-functional interval 64F in sequence on its outer periphery along the clockwise direction shown in the figure. In the following description, unless otherwise specified, the direction of rotation from the +Z side to the +X side when viewed in the Y-axis direction is referred to as the clockwise direction, and the direction of rotation from the +Z side to the -X side is referred to as the counterclockwise direction.

[0153] Figure 8 and Fig. 9 The initial position of the eccentric cam 61 shown is a state where the end of the first presser foot lifting section 64A on the counterclockwise side faces the +Z direction. In the initial position of the eccentric cam 61, the presser foot lifting contact 62 abuts between the first presser foot lifting section 64A and the non-functional section 64F adjacent to the counterclockwise side of the first presser foot lifting section 64A. In addition, the single needle release contact 63 abuts between the single needle release section 64E and the non-functional section 64F adjacent to the clockwise side of the single needle release section 64E.

[0154] When the eccentric cam 61 is in the initial position, the presser foot lifting mechanism 40 does not lift the presser foot 30, and the single needle release mechanism 50 does not release the single sewing state. That is, the presser foot 30 is in the lowest pressing position pressed against the upper surface side of the iron plate supporting the sewing object, and the release lever 52 is not pushed toward the +Y side by the driven link 54 but is forced toward the -Y direction relative to the switching lever 21.

[0155] The first presser foot lifting interval 64A and the second presser foot lifting interval 64B are intervals where the radial distance of the eccentric cam 61 gradually increases in the clockwise direction. The presser foot lifting and holding interval 64C is an interval where the radial distance of the eccentric cam 61 is the same as the maximum radial distance of the eccentric cam 61 in the second presser foot lifting interval 64B and is constant. The presser foot lifting contact member 62 contacts the outer periphery of the eccentric cam 61 in the first presser foot lifting interval 64A, the second presser foot lifting interval 64B, and the presser foot lifting and holding interval 64C.

[0156] The single needle release section 64E is a section where the radial distance of the eccentric cam 61 gradually increases in the counterclockwise direction. The single needle release contact 63 contacts the outer periphery of the eccentric cam 61 in the single needle release section 64E. The non-functional section 64D is a section between the presser foot lifting and holding section 64C and the single needle release section 64E. The non-functional section 64F is a section between the first presser foot lifting section 64A and the single needle release section 64E. Neither the presser foot lifting contact 62 nor the single needle release contact 63 contacts the non-functional section 64D and the non-functional section 64F.

[0157] like Fig.10 and Fig.11 As shown in FIG. 1 , when the eccentric cam 61 rotates counterclockwise from the initial position, the presser foot lifting contact member 62 is in the first presser foot lifting interval 64A (refer to FIG. 1 ). Figure 8 ) moves in the clockwise direction, the presser foot lifting contact member 62 is pushed in the +Z direction. As a result, when the active link 44 rotates counterclockwise around the support shaft 44A, the connecting rod 43 is pulled in the +X direction, the driven link 42 rotates counterclockwise around the support shaft 42A, and the push-up member 41 rises. The rod holding portion 32 is pulled up by the push-up member 41, and the cloth presser foot 30 and the presser foot rod 31 rise from the lowest pressing position to the middle position.

[0158] The intermediate position is a height used to release the pressing pressure of the fabric presser foot 30 when, for example, the orientation of the sewing object is changed while the sewing needles 13A and 13B are inserted into the sewing object. The intermediate position is a height between the pressing position and the presser foot lifting position, for example, a position 7 mm higher than the pressing position. The presser foot lifting position is a height used to make the fabric presser foot 30 retreat so as not to interfere with the operation when, for example, the sewing object is arranged, replaced, or removed. The presser foot lifting position is a height higher than the pressing position and the intermediate position, for example, a position 13 mm higher than the pressing position.

[0159] like Fig.12 and Fig.13 As shown in FIG. 1 , when the eccentric cam 61 further rotates counterclockwise, the presser foot lifting contact member 62 is in the second presser foot lifting interval 64B (refer to FIG. 1 ). Figure 8 ) moves in the clockwise direction, the presser foot lifting contact member 62 is further pushed in the +Z direction. As a result, when the active link 44 rotates counterclockwise around the support shaft 44A, the connecting rod 43 is pulled in the +X direction, the driven link 42 rotates counterclockwise around the support shaft 42A, and the push-up member 41 rises. The rod holding portion 32 is pulled up by the push-up member 41, and the cloth presser foot 30 and the presser foot rod 31 rise from the middle position to the presser foot lifting position.

[0160] When the eccentric cam 61 further rotates counterclockwise, the presser foot lifting contact piece 62 abuts against the presser foot lifting holding section 64C (see Figure 8 ), the presser foot lifting contact piece 62 maintains its position while being pressed against the eccentric cam 61, so the active link 44, the connecting rod 43, the driven link 42 and the push-up member 41 do not move. As a result, the height position of the rod holding portion 32 is maintained by the push-up member 41, and the cloth presser foot 30 and the presser foot rod 31 are maintained in the presser foot lifting position.

[0161] like Fig.14 and Fig.15 As shown in FIG. 1 , when the eccentric cam 61 rotates clockwise from the initial position, the single needle release contact 63 moves counterclockwise on the outer periphery of the single needle release section 64E, and the single needle release contact 63 is pushed in the -X direction. As a result, when the active link 57 rotates clockwise around the support shaft 57A, the connecting plate 56 is pushed in the -X direction, and the connecting shaft 55 is pushed in the -X direction, and the driven link 54 (see FIG. 1 ) is moved in the -X direction. Figure 2 and Figure 4 ) rotates in the direction of moving in the +X direction with the support shaft 54A as the center. Figure 6 The cutout 52D shown is pushed in the +X direction and the +Y direction by the lower end of the driven link 54, and the release lever 52 moves in the +Y axis direction. Figure 7 As shown, when the release lever 52 overcomes the force applied by the elastic member 53 and is pulled in the +Y direction and moves from the engagement screw 21B to the +Y side, the switching lever 21 returns to its original position and the single needle state is released by the switching mechanism 20 .

[0162] [Effect]

[0163] As described above, according to the sewing machine mechanism 1 of this embodiment, the single needle releasing mechanism 50 and the presser foot lifting mechanism 40 can be operated by a motor 70 and via the cam mechanism 60. The single needle releasing mechanism 50 is for switching the needle bar 12 used for sewing in a pair of needle bars 12A, 12B provided in the sewing machine to two needle bars 12A, 12B or any one of the needle bars 12. When the state is that single sewing is performed by any one of the needle bars 12, the state is released and the state is changed to double sewing by the two needle bars 12A, 12B. The presser foot lifting mechanism 40 lifts the presser foot 30 of the fabric that is forced downward.

[0164] The cam mechanism 60 includes an eccentric cam 61 that rotates about a support shaft 61A by a motor 70, a presser foot lifting contact 62 that is supported by the presser foot lifting mechanism 40 and abuts against the outer periphery of the eccentric cam 61, and a single needle release contact 63 that is supported by the single needle release mechanism 50 and abuts against the outer periphery of the eccentric cam 61. The sewing machine mechanism 1 can operate the presser foot lifting mechanism 40 via the presser foot lifting contact 62 and the single needle release mechanism 50 via the single needle release contact 63 based on the rotational position of the eccentric cam 61. Thus, two mechanisms can be operated by one motor 70, so that cost can be suppressed and low noise can be achieved compared to the case where each mechanism is operated by a solenoid in the past.

[0165] [Other embodiments]

[0166] The above describes the embodiments of the present application, but the present invention is not limited to the contents of these embodiments. The embodiments can be appropriately combined within the scope that does not cause contradictions in structure, function and operation. In addition, the structural components include components that can be easily assumed by those skilled in the art, substantially the same components, and components of so-called equal scope. Furthermore, the structural components can be appropriately combined. Furthermore, various omissions, replacements or changes of structural components can be made within the scope that does not deviate from the main purpose of the embodiments.

[0167] For example, the structural components of the parts shown in the figure are conceptual functions and do not need to be physically constructed as shown in the figure. That is, the specific forms of decomposition and synthesis of the parts are not limited to the forms shown in the figure, and all or part of them can be functionally or physically decomposed and synthesized into arbitrary units.

Claims

1. A sewing machine mechanism, comprising: A switching mechanism switches a pair of needle bars provided in the sewing machine for sewing to the two needle bars or any one of the needle bars; A single needle release mechanism releases the switching mechanism when a single needle bar is used for single sewing, thereby enabling the two needle bars to perform double sewing. A presser foot lifting mechanism for lifting the presser foot of the fabric that is forced downward; and Cam mechanism, The cam mechanism has: An eccentric cam that rotates around a support shaft via a motor. a presser foot lifting contact piece supported by the presser foot lifting mechanism and pressed against the outer periphery of the eccentric cam, and a single-needle release contact piece supported by the single-needle release mechanism and pressed against the outer periphery of the eccentric cam, The sewing machine mechanism operates the presser foot lifting mechanism via the presser foot lifting contact and operates the single needle releasing mechanism via the single needle releasing contact based on the rotational position of the eccentric cam.

2. The sewing machine mechanism according to claim 1, wherein: The switching mechanism has a switching lever, The switching lever swings between a first position for performing single-thread sewing with one of the needle bars, a second position for performing single-thread sewing with the other needle bar, and a release position for performing double-thread sewing with the two needle bars, and is urged toward the release position. The single needle release mechanism has: a release lever movable between a holding position for holding the switching lever at the first position or the second position and a release position for releasing the holding; an elastic member for applying force to the release lever from the release position toward the retaining position; as well as The second release lever pushes the release lever and moves it to the release position as the presser foot lifting contact moves.

3. The sewing machine mechanism according to claim 2, wherein: The eccentric cam has on its outer periphery: In the first presser foot lifting section, the cloth presser foot is lifted to a middle position when in contact with the presser foot lifting contact member; a second presser foot lifting section, adjacent to the first presser foot lifting section, wherein the cloth presser foot is lifted to a presser foot lifting position higher than the middle position when in contact with the presser foot lifting contact piece; a presser foot lifting holding section, adjacent to the second presser foot lifting section, wherein the cloth presser foot is maintained at the presser foot lifting position when in contact with the presser foot lifting contact piece; as well as In the single-needle release section, the release lever moves to the release position when in contact with the single-needle release contactor.

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