CN116892087A - Upper thread holding mechanism and sewing device - Google Patents

Abstract

The invention provides a needle thread holding mechanism and a sewing device, which reduces the possibility of the needle thread end being entangled into a stitch compared with the prior art. The upper thread holding mechanism (80) is provided with a first holding member (81), a second holding member (82), and a holding moving part. The first holding member (81) is provided below the needle plate (11), and the second holding member (82) includes a first holding portion (86), a second holding portion (87), and a support portion (84). The first holding part is arranged below the needle plate (11) and above the first holding member (81). The second holding part (87) is provided below the first holding member. A support portion (84) supports the first holding portion and the second holding portion so as to be movable in the horizontal direction. The holding and moving part is provided with a motor, and the second holding member (82) is moved in the horizontal direction by the power of the motor. The holding movement unit can move the second holding member (82) to a standby position (Q1) and a holding position (Q2).

Description

Upper thread holding mechanism and sewing device

Technical Field

The present invention relates to an upper thread holding mechanism and a sewing device.

Background

The conventional sewing device is provided with a thread cutting mechanism and an upper thread clamping mechanism between a needle plate and a rotating shuttle. The thread cutting mechanism is provided with a movable knife and a fixed knife. The thread cutting mechanism makes the movable knife rotate reciprocally along the horizontal direction to cut off the upper thread extending from the needle eye of the machine needle through the processing cloth and the bottom thread extending from the rotating shuttle. The upper thread clamping mechanism is provided with a first thread clamping member and a second thread clamping member. When the needle of the first needle after the start of sewing moves to the upper side of the needle plate, the upper thread clamping mechanism rotates the second thread clamping member to the clamping position and clamps the thread end in cooperation with the first thread clamping member.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open publication No. 2005-278928

Disclosure of Invention

Problems to be solved by the invention

In the conventional sewing device, when the length of the upper thread held by the upper thread holding mechanism is relatively long, the upper thread end may be entangled in the stitch.

The present invention provides a needle thread holding mechanism and a sewing device, which reduces the possibility of the needle thread end being entangled with a stitch compared with the prior art.

Solution for solving the problem

An aspect 1 of the present invention provides an upper thread holding mechanism, comprising: a first holding member provided below a needle plate formed with a needle accommodating hole through which a needle of the sewing device is inserted; a second holding member that holds a thread end of an upper thread in cooperation with the first holding member, the second holding member having a first holding portion provided below the needle plate and above the first holding member, a second holding portion provided below the first holding member, and a support portion that supports the first holding portion and the second holding portion so as to be movable in a horizontal direction; and a holding moving portion having a motor that moves the second holding member in the horizontal direction by a power of the motor, the holding moving portion being capable of moving the second holding member to a standby position when the pin hole is arranged between the first holding member and the second holding member in the horizontal direction, and a holding position when the second holding member is separated from the pin hole in the horizontal direction and the second holding member overlaps the first holding member in an up-down direction. The needle thread holding mechanism according to claim 1 can hold the end portion of the needle thread in a state of being bent in an S-shape along the first holding member and the second holding member by positioning the second holding member at the holding position. The needle thread holding mechanism can lengthen the length of the portion held by the needle thread holding mechanism compared to a mechanism that holds the needle thread end without bending the needle thread end in an S-shape, and therefore, the possibility of the needle thread end being caught in the stitch can be reduced compared to the conventional one.

In the needle thread retaining mechanism according to claim 2 of the present invention, at least one of the first retaining portion and the second retaining portion is formed with an insertion portion that allows the needle to pass therethrough when the second retaining member is located at the standby position. The upper thread holding mechanism according to claim 2 can more stably hold the upper thread end by guiding the upper thread end to the position held by the first holding member and the second holding member when the second holding member moves to the holding position by the insertion portion provided in at least one of the first holding portion and the second holding portion.

In the needle thread holding mechanism according to claim 3 of the present invention, the supporting portion of the second holding member is a pin member that is perpendicular to the needle plate, and the second holding member is rotatably supported by the needle plate via the supporting portion, and is rotatable about the supporting portion to the standby position and the holding position. The upper thread holding mechanism of claim 3 can stably move the second holding member to the standby position and the holding position with the pin member center.

In the needle thread holding mechanism according to claim 4 of the present invention, the supporting portion is provided on the motor side with respect to the Rong Zhenkong in a direction from the motor toward the needle accommodating hole on a surface parallel to the needle plate. The needle thread holding mechanism can improve the degree of freedom of design of the side opposite to the motor side relative to the needle hole in the direction from the motor to the needle hole on the surface parallel to the needle plate.

A 5 of the present invention provides a sewing device, comprising: a needle bar mechanism having a needle bar to which a machine needle can be attached at a lower end, the needle bar being swingable in an up-down direction; a needle plate formed with a needle accommodating hole through which the needle is inserted; and the needle thread retaining mechanism according to any one of claims 1 to 4. In the sewing device according to claim 5, the second holding member of the upper thread holding mechanism is positioned at the holding position, whereby the upper thread end can be held in a state of being bent in an S-shape along the first holding member and the second holding member. In the sewing device, compared with a mechanism for holding the upper thread end part without bending the upper thread end part into an S shape, the length of the part held by the upper thread holding mechanism can be prolonged, so the possibility of the upper thread end part being wound into a stitch can be reduced compared with the prior art.

The sewing device according to claim 6 of the present invention includes a cutting mechanism for cutting an upper thread and a lower thread, the cutting mechanism including a fixed knife fixed to the lower side of the needle plate and a movable knife rotatable in the horizontal direction with respect to the fixed knife, the movable knife being movable between a knife standby position at a position separated from the fixed knife, a cutting position at which the fixed knife intersects the upper thread and the lower thread to cut the upper thread and a movable end position on a side opposite to the knife standby position with respect to the cutting position, the movable knife being movable by a power of the motor. In the sewing device according to claim 6, the power of the upper thread holding mechanism is shared with the cutting mechanism, so that the structure can be simplified as compared with a sewing device in which the power of the upper thread holding mechanism and the power of the cutting mechanism are independently provided.

In the sewing device according to claim 7 of the present invention, the rotation center of the movable knife is provided on the opposite side of the Rong Zhenkong from the motor side in a direction from the motor toward the needle accommodating hole on a surface parallel to the needle plate. In the sewing machine according to claim 7, when the second holding member of the needle thread holding mechanism rotates around the rotation center on the motor side with respect to the needle hole in the direction from the motor toward the needle hole on the surface parallel to the needle plate, the possibility of interference between the needle thread holding mechanism and the cutting mechanism can be reduced, and the degree of freedom in designing the motor side with respect to the needle hole can be improved.

The sewing device according to claim 8 of the present invention further includes a control device that performs a needle thread holding control process of moving the second holding member from the standby position to the holding position after the first needle sewing and before the second needle sewing. In the sewing device according to claim 8, the second holding member is moved from the standby position to the holding position after the first needle sewing and before the second needle sewing, thereby holding the upper thread end.

Drawings

Fig. 1 is an overall perspective view of the sewing apparatus 1.

Fig. 2 is a perspective view of the cutting mechanism 60 and the dough-line holding mechanism 80.

Fig. 3 is an exploded perspective view of a part of the cutting mechanism 60 and a part of the needle thread holding mechanism 80.

Fig. 4 is a bottom view of a part of the cutting mechanism 60 and a part of the upper thread holding mechanism 80.

Fig. 5 is a partial bottom view of the cutting mechanism 60.

Fig. 6 is a bottom view of the motor 59, the cam plate 70, and the links 73, 74 as part of the link mechanism 72.

Fig. 7 is a partial bottom view of the needle thread holding mechanism 80.

Fig. 8 is a block diagram showing an electrical structure of the sewing apparatus 1.

Fig. 9 is a flowchart of a main process of the sewing apparatus 1.

Fig. 10 (a) is a partial bottom view of the motor 59, the cam plate 70, and the link mechanism 72 when the second holding member 82 is in the standby position Q1, fig. 10 (B) is a partial bottom view of the motor 59, the cam plate 70, and the link mechanism 72 when the second holding member 82 is in the holding position Q2, and fig. 10 (C) is a partial bottom view of the motor 59, the cam plate 70, and the link mechanism 72 when the second holding member 82 is in the upper thread cutting position Q3.

Fig. 11 (a) is a bottom view of a part of the cutting mechanism 60 and a part of the needle thread holding mechanism 80 when the second holding member 82 is at the standby position Q1, fig. 11 (B) is a bottom view of a part of the cutting mechanism 60 and a part of the needle thread holding mechanism 80 when the second holding member 82 is at the holding position Q2, and fig. 11 (C) is a bottom view of a part of the cutting mechanism 60 and a part of the needle thread holding mechanism 80 when the second holding member 82 is at the needle thread cutting position Q3.

Fig. 12 (a) is a cross-sectional view taken along line G1-G1 of fig. 11 (a), fig. 12 (B) is a cross-sectional view taken along line G2-G2 of fig. 11 (B), and fig. 12 (C) is a cross-sectional view taken along line G3-G3 of fig. 11 (C).

Fig. 13 (a) is a cross-sectional view taken along line F1-F1 of fig. 11 (a), fig. 13 (B) is a cross-sectional view taken along line F2-F2 of fig. 11 (B), and fig. 13 (C) is a cross-sectional view taken along line F3-F3 of fig. 11 (C).

Fig. 14 (a) is a partial bottom view of the motor 59, the cam plate 70, and the link mechanism 72 when the movable blade 62 is at the movable end position P4, and fig. 14 (B) is a partial bottom view of the motor 59, the cam plate 70, and the link mechanism 72 when the movable blade 62 is at the cutting position P3.

Fig. 15 (a) is a bottom view of a part of the cutting mechanism 60 and a part of the needle thread holding mechanism 80 when the movable blade 62 is at the movable end position P4, and fig. 15 (B) is a bottom view of a part of the cutting mechanism 60 and a part of the needle thread holding mechanism 80 when the movable blade 62 is at the cutting position P3.

Description of the reference numerals

1. A sewing device; 11. a needle plate; 12. rong Zhenkong; 14. a needle bar; 15. a needle; 30. a needle bar mechanism; 41. a CPU; 59. a motor; 60. a cutting mechanism; 61. fixing the knife; 62. a movable knife; 69. a support shaft; 67. a moving part; 80. an upper thread holding mechanism; 81. a first holding member; 82. a second holding member; 84. a support section; 86. a first holding portion; 87. a second holding portion; 88. an insertion portion; p1, a knife standby position; p3, cutting position; p4, the position of the movable end; q1, standby position; q2, hold position; u, upper thread end.

Detailed Description

Embodiments of the present invention are described. In the following description, the left and right, front and back, and up and down indicated by arrows in the drawings are used. The left-right direction, front-rear direction, and up-down direction of the sewing device 1 are an X-axis direction, a Y-axis direction, and a Z-axis direction, respectively.

The structure of the suture device 1 will be described with reference to fig. 1. In the sewing device 1, the sewing object 19 is conveyed in the X-axis direction and the Y-axis direction relative to the needle 15, and sewing can be performed in the 360-degree direction. The sewing object 19 is, for example, cloth, leather, or the like. The sewing device 1 includes a seat portion 2, a stay portion 3, a arm portion 4, a cloth feeder 5, a control portion 10 (see fig. 8), and an operation panel 18. The seat 2 is provided on the sewing machine table 6. The base 2 includes a table 7 on the front side of the upper surface. The table 7 includes a needle plate 11 at a substantially center. A needle receiving hole 12 is formed in a substantially center of the needle plate 11. The sewing device 1 includes a lower shaft and a vertical shuttle, not shown, inside the housing 2. The vertical shuttle is disposed below the needle plate 11, and the lower shaft extends in the front-rear direction. The front end of the lower shaft is connected with the vertical shuttle. The vertical shuttle accommodates a bobbin around which a bobbin thread is wound and swings reciprocally centering on a lower shaft.

The pillar portion 3 extends upward from the rear portion of the seat portion 2. The arm portion 4 extends forward from the upper portion of the pillar portion 3, and rotatably supports the main shaft therein. The main shaft extends in the front-rear direction and is coupled to a main motor 17 (see fig. 8) provided inside the arm portion 4 at the rear side. The connecting rod extends in the vertical direction inside the pillar portion 3. The main shaft is connected with the lower shaft through a connecting rod. Therefore, when the main motor 17 is driven, the main shaft rotates, and the vertical shuttle is driven in accordance with the rotation of the main shaft. The sewing machine table 6 is provided with an operation panel 18 on the right side of the upper surface. The operation panel 18 is, for example, a touch panel, and includes the display unit 13 and the input unit 16. The display unit 13 displays various information, and the input unit 16 receives various information such as an instruction to start sewing.

The arm portion 4 has a distal end portion 8 at a distal end portion. The lower end of the tip portion 8 is opposed to the upper surface of the needle plate 11. The distal end portion 8 supports the needle bar 14 and the presser bar 20 so as to be movable up and down. The needle bar 14 extends in the up-down direction and protrudes downward from the tip end portion 8. The needle bar 14 is fitted with a needle 15 at the lower end. The needle 15 has an eye through which the upper thread is passed to hold the upper thread. The needle bar 14 is coupled to the main shaft. When the needle bar 14 moves up and down by the rotation of the main shaft, the needle 15 moves up and down, passing through the needle accommodating hole 12. The needle 15, which moves up and down, forms a stitch on the sewing object 19 in cooperation with the vertical shuttle. The presser bar 20 extends in the up-down direction on the left side of the needle bar 14, and protrudes downward from the distal end portion 8. The presser bar 20 is fitted with a presser foot 9 at the lower end. The presser foot 9 intermittently presses the sewing object 19 downward.

The cloth feeding device 5 includes an X motor 21 (see fig. 8), a cloth holder 22, a support 23, a lever 24, a Y motor 25 (see fig. 8), and the like. The cloth feeding device 5 includes an X guide rail, an X moving plate, a Y guide rail, and a Y moving plate, which are not shown. The X motor 21 is provided inside the seat portion 2 at the rear side. The X rail extends in the X axis direction inside the housing 2 and in front of the X motor 21. The X moving plate is connected to the X rail so as to be movable in the left-right direction and is connected to the X motor 21. The X moving plate moves left and right along the X guide rail by the driving force of the X motor 21. The Y guide rail is fixed on the upper surface of the X moving plate and extends along the Y axis direction. The Y guide rail moves left and right integrally with the X moving plate. The Y moving plate is connected to the Y guide rail in a manner capable of moving back and forth. The cloth holder 22 is fixed to the upper surface of the Y moving plate. The cloth holder 22 moves in the front-rear direction integrally with the X moving plate and the Y moving plate while moving in the left-right direction integrally with the Y moving plate. Accordingly, the cloth holder 22 can move in the horizontal direction. The support 23 is connected to the rear portion of the pressing arm 32 of the cloth holder 22. The support portion 23 can move left and right together with the cloth holder 22. The lever portion 24 extends rearward from the support portion 23 into the pillar portion 3, and is movable forward and backward. The front end of the lever 24 is connected to the support 23 via a slider. The Y motor 25 is provided inside the pillar portion 3 and is connected to the rod portion 24. When the lever portion 24 moves forward and backward by the driving force of the Y motor 25, the support portion 23, the cloth holder 22, and the Y moving plate integrally move forward and backward.

The cloth holder 22 includes a conveying plate 31, a pressing arm 32, a pair of connecting portions 33, a pressing frame 34, a pair of cylinders 35 (only one of which is shown in fig. 1), and the like. The transport plate 31 extends forward from the upper surface of the Y-moving plate, and includes a clamp frame 36 at the front end. The holding frame 36 is rectangular in plan view, and is capable of supporting the sewing object 19. The pressing arm 32 extends upward from the rear end portion of the conveying plate 31, and then bends and extends toward the front side. The pressing arm 32 sandwiches the rear end of the conveying plate 31 between the pressing arm 32 and the upper surface of the Y moving plate to fix the conveying plate 31. The tip end 37 of the pressing arm 32 is substantially rectangular in front view. The pair of coupling portions 33 are arranged in the left-right direction at the tip end portion 37 and are movable up and down. The pair of connecting portions 33 support the pressure-receiving frame 34. The pressing frame 34 is substantially rectangular in plan view, and faces the holding frame 36 in the up-down direction. A pair of cylinders 35 are provided at left and right portions of the pressing arm 32. The pair of cylinders 35 are connected to the pair of connecting portions 33, respectively. When the pair of cylinders 35 are driven to move the pair of coupling portions 33 up and down, the press frame 34 moves up and down between the gripping position and the spaced-apart position. The holding position is a position where the pressing frame 34 presses the sewing object 19 supported by the holding frame 36 from above. The separated position is a position where the press frame 34 is separated upward from the sewing object 19. The sewing device 1 can perform sewing in the 360-degree direction by moving the cloth holder 22 holding the sewing object 19 relative to the needle 15 in the X-axis direction and the Y-axis direction.

As shown in fig. 2, the sewing apparatus 1 includes a cutting mechanism 60 and a knitting thread holding mechanism 80 on the lower surface side of the needle plate 11. The cutting mechanism 60 is driven by the power of the motor 59, and cuts the upper thread and the lower thread at the end of the sewing operation. The needle thread holding mechanism 80 is driven by the power of the motor 59, and releasably holds the needle thread end U of the needle thread passing through the needle 15 at the lower side of the needle plate 11 (see fig. 12). The upper thread holding mechanism 80 bends and holds an upper thread passing under the sewing object 19 by a first needle at the start of sewing. Accordingly, the needle thread holding mechanism 80 prevents the needle thread from being removed from the needle 15. A motor 59 is fixed to the back surface side of the base 2 of the sewing device 1. The motor 59 is a pulse motor, and is a driving source of the cutting mechanism 60 and the noodle wire holding mechanism 80.

As shown in fig. 2 to 5, the cutting mechanism 60 includes a fixed blade 61, a movable blade 62, a biasing member 65, a support shaft 69, and a moving portion 67. As shown in the drawing, the fixed blade 61 is fixed to the lower side of the needle plate 11, and the needle plate 11 is formed with a needle accommodating hole 12 through which the needle 15 of the sewing device 1 is inserted. The fixed blade 61 is substantially L-shaped in plan view and is fixed to the lower surface of the needle plate 11 by two screws 611. The fixed blade 61 includes a blade portion 612. The knife portion 612 is provided at the right rear portion of the fixed knife 61 and extends from the left side of the container pin hole 12 toward the front of the container pin hole 12.

The movable blade 62 is provided to be horizontally rotatable with respect to the fixed blade 61. The movable blade 62 includes a branching portion 621, a blade portion 622, a wire engaging portion 623, a wire guiding portion 624, a wire catching portion 625, a wire holding portion 66, a wire releasing portion 68, and the like. The branching portion 621 has a tip end portion tapered rearward, and is a portion that enters the needle thread loop formed by the needle thread. The knife portion 622 is an end portion of a through hole penetrating the movable knife 62 in the vertical direction and having a circular shape in a planar view. The wire engaging portion 623 is a portion for hooking one side of the face wire loop extending from the needle 15. The wire guide portion 624 is a portion bent between the branching portion 621 and the wire catching portion 625 on the opposite side of the pin 763 of the link 76 with respect to the support shaft 69. The thread guide 624 guides the side of the thread loop extending from the sewing object 19 to the thread catching part 625. The wire capturing portion 625 is a portion that captures the face wire loop.

The thread clamp 66 is a portion of the lower surface of the movable blade 62 that can clamp the bobbin thread end D (see fig. 13 (a)) of the bobbin thread cut by the movable blade 62 between the lower surface and the biasing member 65. The wire releasing portion 68 is a portion of the lower surface of the movable blade 62 that cannot clamp the base wire end portion D with the urging member 65. The wire releasing portion 68 is a recess which is provided adjacent to the wire holding portion 66 and is recessed upward in a portion which is in contact with the wire capturing portion 625 in the lower surface of the movable blade 62 in a portion sandwiched between the wire branching portion 621 and the wire capturing portion 625. That is, the wire holding portion 66 is located below the wire releasing portion 68.

Insertion portions 626 and 627 are formed in the movable blade 62. The insertion portion 626 is a hole penetrating in the vertical direction at an end portion of the movable blade 62 (a rear end portion of the movable blade 62 in the position of fig. 3) provided on the opposite side to the side where the branching portion 621 is provided. The insertion portion 626 is inserted by a pin 763 of a link 76 described later. The insertion portion 627 is a hole provided in the center portion of the movable blade 62 in the longitudinal direction and penetrating in the vertical direction. The support shaft 69 is inserted through the insertion portion 627, fixed to the lower surface of the needle plate 11, and supports the movable blade 62 so as to be capable of reciprocating rotation in a horizontal direction parallel to the needle plate 11. The support shaft 69, which is the rotation center of the movable blade 62, is provided on the opposite side of the needle hole 12 from the motor 59 side in the front-rear direction in the present embodiment in the direction from the motor 59 toward the needle hole 12 on the surface parallel to the needle plate 11. The support shaft 69 is located to the right of the screw 611.

As shown in fig. 4, the biasing member 65 is fixed to the lower side of the needle plate 11 by two screws 651 at a position forward of the needle hole 12. The urging member 65 is a curved plate spring. The urging member 65 includes a fixing portion 652, a pressing portion 653, and guide portions 654, 655. The fixing portion 652 is a plate-like member extending from the front to the right and back of the needle hole 12 and parallel to the needle plate 11, and is fixed to the needle plate 11 by two screws 651. The pressing portion 653 is a portion bent downward from the left rear end portion of the fixing portion 652 and then bent rearward in a U-shape in bottom view. The pressing portion 653 is gently inclined toward the rear lower side. As shown in fig. 13 (a), the guide portion 654 is inclined so as to be lower toward the rear in the rear of the pressing portion 653. The guide portion 655 is a portion bent upward from the left end of the guide portion 654. The guide portions 654 and 655 guide the movable blade 62 to move so as to be disposed between the biasing member 65 and the needle plate 11. The urging member 65 can urge the wire holding portion 66 of the movable blade 62 upward.

As shown in fig. 2, the moving unit 67 includes a motor 59, and rotates the movable blade 62 in the horizontal direction by the power of the motor 59. The moving unit 67 includes a motor 59, a cam plate 70, and a link mechanism 72. The motor 59 is a pulse motor, and is fixed to the lower back surface of the base 2 in a posture in which the output shaft 98 faces downward (see fig. 1). The cam plate 70 converts the rotational force of the output shaft 98 of the motor 59 into power that drives the link mechanism 72. The link mechanism 72 drives the movable blade 62 of the cutting mechanism 60 according to the rotation direction and angle of the cam plate 70 to cut the upper thread and the lower thread. The link mechanism 72 drives the second holding member 82 of the needle thread holding mechanism 80 in accordance with the rotation direction and angle of the cam plate 70 to hold the needle thread end U at a predetermined timing when the sewing starts.

As shown in fig. 6, the cam plate 70 is disposed below the motor 59 and is fixed to the distal end portion of the output shaft 98 of the motor 59. The cam plate 70 is formed in a substantially semicircular shape in bottom view, and has a shaft hole 701 formed in the center. The tip end portion of the output shaft 98 of the motor 59 is inserted into and fixed to the shaft hole 701. The cam plate 70 rotates integrally with the output shaft 98. The cam plate 70 includes the grooved cam 71 within a range of about 180 degrees around the shaft hole 701. The groove cam 71 is semicircular in plan view and has a groove shape in which the lower surface of the cam plate 70 is recessed in the thickness direction.

As shown in fig. 2 and 6, the link mechanism 72 includes links 73 to 76 and a roller member 77. The links 73 to 76 are arranged in order from the motor 59 side toward the cutting mechanism 60 side. The link 73 has a substantially L-shaped plate shape in plan view, and is disposed below the cam plate 70. The roller member 77 is rotatably fixed to an upper side of one end 731 of the link 73. The roller member 77 includes a rotation shaft extending in the up-down direction. The roller member 77 engages with the groove cam 71 of the cam plate 70. A shaft hole 734 is provided in a central portion 733 bent substantially at right angles between one end 731 and the other end 732 of the link 73. Since the support shaft 735 is inserted into the shaft hole 734, the link 73 can rotate around the support shaft 735. The roller member 77 engages with the groove cam 71 of the cam plate 70. The other end 732 of the link 73 is rotatably coupled to an end 741 of the link 74 via a pin 736.

The link 74 is rod-shaped extending in the front-rear direction. The other end 742 of the link 74 is secured to an end 751 of the link 75 by a screw 743. The link 75 is a C-shaped plate member that is open to the right in the main view. The other end 752 of the link 75 is positioned above the one end 751 and is fixed to the one end 761 of the link 76 by a screw 744. A center portion 753 of the link 75 extending in the up-down direction is inserted through a support shaft 754 extending in the up-down direction. The link 75 is rotatable about a support shaft 754. The link 76 extends in the front-rear direction. As shown in fig. 3 and 4, the other end 762 of the link 76 bulges in a substantially circular arc shape to the right. The other end 762 of the link 76 has upwardly projecting pins 763, 764. The pin 763 is provided at the distal end portion of the link 76, and is inserted into the insertion portion 626 of the movable blade 62. The movable blade 62 is coupled to the link 76 by a pin 763 of the link 76. The pin 764 is provided at a position rearward of the pin 763, and is inserted into an insertion portion 861 of a second holding member 82 of the needle thread holding mechanism 80 described later. The second holding member 82 is coupled to the link 76 by a pin 764 of the link 76. The link 76 is located below the second retaining member 82 and the movable knife 62.

The moving unit 67 moves the link 76 in the front-rear direction by the power of the motor 59, and thereby can rotate the movable blade 62 in the horizontal direction parallel to the needle plate 11 about the support shaft 69. The moving unit 67 can move the movable blade 62 to the blade standby position P1, the release position P2, the cutting position P3, and the movable end position P4 shown in fig. 5 in response to the driving of the motor 59. In fig. 5, the fixed blade 61, the movable blade 62, and the link 76 are not shown, and the position of the movable blade 62 is shown as the position of the blade portion 622.

The knife standby position P1 is a position when: the movable blade 62 is located at a position separated from the fixed blade 61, and the thread holding portion 66 of the movable blade 62 is disposed between the needle plate 11 and the biasing member 65 so as to face the biasing member 65, and the thread holding portion 66 can hold the bottom thread end D together with the biasing member 65. The release position P2 is a position where the thread release portion 68 of the movable blade 62 is disposed between the needle plate 11 and the biasing member 65 so as to face the biasing member 65. The cutting position P3 is a position at which the movable blade 62 intersects the fixed blade 61 to cut the upper thread and the lower thread. The movable end position P4 is a position on the opposite side of the cutting position P3 from the knife standby position P1. That is, the movable end position P4 is located in a counterclockwise direction with respect to the cutting position P3 when the support shaft 69 is a center, and the knife standby position P1 is located in a clockwise direction with respect to the cutting position P3 when the support shaft 69 is a center. On the moving rail J1 of the movable blade 62, the cutting position P3 is located between the blade standby position P1 and the movable end position P4, and the release position P2 is located between the blade standby position P1 and the cutting position P3. The main process of moving the movable knife 62 to each position in the sewing apparatus 1 will be described later.

As shown in fig. 2 to 4 and 7, the needle thread holding mechanism 80 includes a first holding member 81, a second holding member 82, and a moving portion 67. The needle thread holding mechanism 80 of the present embodiment further includes a fixed cutter 97. The moving unit 67 is common to the cutting mechanism 60. The first holding member 81 is provided below the needle plate 11, and the needle plate 11 is formed with a needle accommodating hole 12 through which the needle 15 of the sewing device 1 is inserted. The first holding member 81 is a plate-like member extending in the horizontal direction parallel to the needle plate 11 and long in the left-right direction. The first holding member 81 extends in the horizontal direction at a position below the wire guide portion 624 of the movable blade 62. The first holding member 81 is disposed in the left direction with respect to the needle hole 12, and is fixed to the lower side of the needle plate 11 by a pair of front and rear screws 811. The right end portion of the first holding member 81 is inclined rearward as going to the right. As shown in fig. 13 (a), the first holding portion 86 of the second holding member 82 is disposed on the same horizontal plane as the movable blade 62. Here, the same horizontal plane refers to an arbitrary virtual horizontal plane passing through both the first holding portion 86 and the movable blade 62, and the extending range in the up-down direction of the first holding portion 86 overlaps at least a part of the extending range in the up-down direction of the movable blade 62.

As shown in fig. 2 to 4 and 7, the second holding member 82 holds the upper thread end U of the upper thread in cooperation with the first holding member 81. The second holding member 82 includes a first holding portion 86, a second holding portion 87, and a supporting portion 84. The first holding portion 86 is provided below the needle plate 11 and above the first holding member 81. The first holding portion 86 is formed with an insertion portion 88, and the insertion portion 88 has a plate shape long in the front-rear direction and allows the needle 15 to pass through when the second holding member 82 is located at the standby position Q1 of fig. 7. The first holding portion 86 is formed with insertion portions 861, 863, and a pair of screw holes 862. The insertion portion 861 is a hole penetrating in the vertical direction provided at the end of the first holding portion 86. The pin 764 of the link 76 is inserted into the insertion portion 861. The insertion portion 863 is a hole penetrating in the vertical direction provided in front of the insertion portion 861. The second holding member 82 is rotatably supported by a support portion 84 of an insertion portion 863 inserted in the first holding portion 86 in a horizontal direction parallel to the needle plate 11. The support portion 84 is a pin member provided perpendicularly to the needle plate 11. The second holding member 82 is supported by a support portion 84 inserted through the first holding portion 86 so as to be rotatable in a horizontal direction parallel to the needle plate 11. The support portion 84 is provided behind the receiving hole 12. That is, the support portion 84 is provided on the motor 59 side with respect to the needle hole 12 in a direction from the motor 59 toward the needle hole 12 and a direction opposite thereto (in the present embodiment, a front-rear direction) of a surface parallel to the needle plate 11. The distance between the center of the support shaft 69 and the center of the pin 764 is smaller than the distance between the center of the support portion 84 and the center of the pin 764. Accordingly, the amount of rotation of the movable blade 62 with respect to the amount of movement of the link 76 is greater than the amount of rotation of the second holding member 82 with respect to the amount of movement of the link 76.

The second holding portion 87 is plate-shaped and long in the front-rear direction, and is provided below the first holding member 81. The length of the second holding portion 87 in the front-rear direction is shorter than the length of the first holding portion 86 in the front-rear direction. The second holding portion 87 is formed with an insertion portion 89, and the insertion portion 89 allows the needle 15 to pass through when the second holding member 82 is located at the standby position Q1. The second holding portion 87 is formed with two holes 872 penetrating in the up-down direction. The second holding portion 87 is fixed to the lower surface of the first holding portion 86 by a screw 871 inserted through the hole 872 in a state of overlapping with the first holding portion 86. At this time, the second holding portion 87 is located forward of the support portion 84. The insertion portions 88, 89 of the present embodiment are notches open to the left, and the contours of the insertion portions 88, 89 overlap each other in a plan view. The insertion portions 88, 89 are formed in the second holding member 82 on the opposite side of the insertion portion 861 to the support portion 84. The second holding portion 87 is not movable relative to the first holding portion 86, but moves in the horizontal direction together with the first holding portion 86. As in fig. 12 (a), the thickness of the first holding portion 86 and the second holding portion 87 is larger than the thickness of the first holding member 81. The thickness of the first holding portion 86 is larger than that of the second holding portion 87.

As shown in fig. 3, the fixed cutter 97 is fixed to the lower side of the needle plate 11, and the needle plate 11 is formed with a needle accommodating hole 12 through which the needle 15 is inserted. The fixed cutter 97 includes a cutter portion 96. The knife portion 96 is provided on the right side of the fixed cutter 97, and is disposed on the left side of the receiving hole 12. As in fig. 12 (a), the right end of the blade 96 is inclined downward and rightward. The fixed cutter 97 includes a pair of front and rear holes 971 penetrating in the vertical direction. The fixed cutter 97 is located above the first holding member 81. The fixing cutter 97 is fixed to the lower side of the needle plate 11 together with the first holding member 81 by screws 811 inserted through a pair of holes 971.

The pin 764 of the link 76 is inserted into the insertion portion 861 of the second holding member 82, whereby the moving portion 67 and the second holding member 82 are coupled. The moving portion 67 moves the link 76 forward and backward by the power of the motor 59, and thereby the second holding member 82 can be rotated in the horizontal direction parallel to the needle plate 11 around the supporting portion 84. That is, the moving portion 67 can move the movable blade 62 and the second holding member 82, respectively. Specifically, the moving unit 67 moves the second holding member 82 to the standby position Q1, the holding position Q2, the upper thread cutting position Q3, the cutting position Q4, and the movable end position Q5 shown in fig. 7. In fig. 7, the first holding portion 86, the second holding portion 87, the supporting portion 84, the fixed cutter 97, and the link 76 are not shown, and the position of the second holding member 82 is indicated by the position of an imaginary circle inscribed in the circular-arc-shaped right end portion of the insertion portion 89.

The standby position Q1 is a position when the pin hole 12 is arranged between the first holding member 81 and the second holding member 82 in the horizontal direction. The holding position Q2 is a position when the second holding member 82 is separated from the receptacle hole 12 in the horizontal direction and the second holding member 82 overlaps the first holding member 81 in the up-down direction. The upper thread cutting position Q3 is a position at which the upper thread end U held by the first holding member 81 and the second holding member 82 is cut by the fixed cutter 97. On the moving rail J2 of the second holding member 82, the holding position Q2 is located between the standby position Q1 and the upper thread cutting position Q3. The cutting position Q4 and the movable end position Q5 are positions corresponding to the cutting position P3 and the movable end position P4 of the movable blade 62, respectively. The main process of moving the second holding member 82 to each position in the sewing apparatus 1 will be described later.

The electrical structure of the sewing device 1 will be described with reference to fig. 8. The control unit 10 of the sewing apparatus 1 includes a CPU41, a ROM42, a RAM43, a storage device 45, an I/O interface (hereinafter referred to as I/O) 46, drive circuits 51 to 56, and the like. The CPU41 controls the operation of the sewing device 1. The CPU41 is connected to the ROM42, the RAM43, the storage device 45, and the I/O46. The ROM42 stores programs and the like for executing various processes such as a main process (see fig. 9) described later. The RAM43 temporarily stores various information. The storage device 45 is nonvolatile and stores sewing information and the like. The sewing information is information including needle falling points.

The I/O46 is connected to the driving circuits 51 to 56 and the input unit 16. The drive circuit 51 is connected to the main motor 17. The drive circuit 52 is connected to the X motor 21. The driving circuit 53 is connected to the Y motor 25. The drive circuit 56 is connected to a motor 59. The X motor 21, Y motor 25, and motor 59 are pulse motors. The driving circuit 54 is connected to the pair of cylinders 35. The driving circuit 55 is connected to the display unit 13. The CPU41 controls the drive circuits 51 to 54 to drive and control the main motor 17, the X motor 21, the Y motor 25, and the pair of cylinders 35. The CPU41 controls the display section 13 by controlling the driving circuit 56. The input unit 16 detects information input by the operator, and outputs the detection result to the CPU41 via the I/O46.

The encoders 91 to 93 are connected to the main motor 17, the X motor 21, and the Y motor 25, respectively. The encoder 91 detects the rotational position of the output shaft of the main motor 17. The encoder 92 detects the rotational position of the output shaft of the X motor 21. The encoder 93 detects the rotational position of the output shaft of the Y motor 25. The encoders 91 to 93 output the detection results to the CPU41 via the I/O46.

With reference to fig. 9 to 15, the main processing performed by the sewing device 1 of specific examples 1 and 2 in which the timing of cutting the upper thread is different from each other will be described. In the main process, a process of forming a stitch on the sewing object 19 according to the sewing pattern is performed. When the power of the sewing apparatus 1 is turned on, the CPU41 starts the main process. When the power of the sewing apparatus 1 is turned on, the CPU41 reads out a program for executing the main process stored in a program storage area of the ROM42 to the RAM43. The CPU41 executes the following steps in accordance with instructions included in the program read out to the RAM43. Hereinafter, the step is simply referred to as S. Various parameters necessary for performing the main processing are stored in the storage device 45. Various data obtained during the main processing are appropriately stored in the RAM43. The timing of cutting the upper thread may be set before the main process is performed, and may be set by a worker or may be automatically set according to the sewing conditions such as the type and thickness of the sewing object 19.

As shown in fig. 9, the CPU41 determines whether or not an origin detection instruction is detected (S1). The operator operates the input unit 16 to input an origin detection instruction. When the origin detection instruction is not detected (S1: no), the CPU41 returns the process to S1. When the origin detection instruction is detected (S1: yes), the CPU41 executes the origin detection (S2), and then raises the presser foot 9 (S3).

The operator sets a sewing object 19 to be sewn between the cloth holders 22, operates the input unit 16, and inputs a lowering instruction of the presser foot 9. The CPU41 determines whether or not a lowering instruction of the presser foot 9 is detected (S4). When the down instruction is not detected (S4: no), the CPU41 returns the process to S4. When the lowering instruction is detected (S4: yes), the CPU41 lowers the presser foot 9 (S5). As in fig. 10 (a), the roller member 77 provided at the one end 731 of the link 73 of the moving portion 67 is located at the left end of the slot cam 71. As shown in fig. 11 (a), the movable blade 62 of the cutting mechanism 60 is positioned at the blade standby position P1, and the second holding member 82 of the upper thread holding mechanism 80 is positioned at the standby position Q1. That is, when the second holding member 82 is located at the standby position Q1, the movable blade 62 is located at the blade standby position P1. The first holding member 81 and the second holding member 82 partially overlap in the up-down direction when viewed from the bottom. In a bottom view, rong Zhenkong is surrounded by the first and second holding members 81 and 82. The blade portion 622 of the movable blade 62 is located near the boundary between the guide portion 654 and the pressing portion 653. As in fig. 12 (a), the second holding member 82 of the needle thread holding mechanism 80 is separated from the needle thread end U. The upper thread end U located below the needle-receiving hole 12 is surrounded by the first and second holding members 81 and 82. As shown in fig. 13 (a), the wire holding portion 66 of the movable blade 62 of the cutting mechanism 60 holds the base wire end D in the up-down direction together with the biasing member 65. The upper end of the pressing portion 653 of the urging member 65 abuts against the wire holding portion 66 of the movable blade 62.

The CPU41 determines whether or not a sewing instruction is detected (S6). The operator operates the input unit 16 to input a sewing instruction. When the sewing instruction is not detected (S6: NO), the CPU41 returns the process to S6. When the sewing instruction is detected (S6: yes), the CPU41 drives the main motor 17 to start sewing the sewing pattern (S7). The CPU41 determines whether or not the upper thread holding timing is based on the detection result of the encoder 91 (S8). The needle thread holding timing of the sewing device 1 of the present embodiment is set after the first needle sewing and before the second needle sewing. When it is not the upper thread holding timing (S8: no), the CPU41 returns the process to S8. When the needle thread holding timing is established (S8: yes), the CPU41 performs a needle thread holding control process for moving the second holding member 82 from the standby position Q1 to the holding position Q2 (S9).

The CPU41 drives the motor 59 to rotate the output shaft 98 of the motor 59 from the origin in the bottom clockwise direction to the position of fig. 10 (B). As in fig. 10 (B), the roller member 77 relatively moves from the left end portion of the slot cam 71 to a position rotated in the counterclockwise direction in the bottom view. The link 73 rotates in the counterclockwise direction as viewed from above about the support shaft 735, and moves the links 74 to 76. As shown in fig. 11 (B), the movable blade 62 of the cutting mechanism 60 moves to the rear of the blade standby position P1, and the second holding member 82 of the upper thread holding mechanism 80 moves from the standby position Q1 to the holding position Q2. The second holding member 82 is separated from the receiving hole 12 in the horizontal direction, and the second holding member 82 overlaps the first holding member 81 in the up-down direction. As shown in fig. 12 (B), the needle thread holding mechanism 80 holds the needle thread end U in a state of being bent in a side view S-shape between the first holding member 81 and the second holding member 82. As shown in fig. 13 (B), the wire holding portion 66 of the movable blade 62 of the cutting mechanism 60 is held in a state of holding the base wire end portion D in the up-down direction together with the biasing member 65.

The CPU41 determines whether or not the upper thread cutting timing is based on the detection result of the encoder 91 (S10). The upper thread cutting timing of the sewing device 1 of the present embodiment may be set after S9. In specific example 1, the needle thread cutting timing is set after the needle thread holding control process and before the needle fall of the second needle. In specific example 2, the needle thread cutting timing is set at a predetermined timing after the needle thread holding control process and after the needle fall of the second needle. The predetermined timing of specific example 2 may be set appropriately, in this example, after the needle of the third needle and before the needle of the fourth needle. When the upper thread cutting timing is not present (S10: NO), the CPU41 returns the process to S10. When the needle thread holding timing is established (S10: yes), the CPU41 controls the motor 59 to execute the needle thread cutting process of moving the second holding member 82 from the holding position Q2 to the needle thread cutting position Q3 after S9 (S12). The CPU41 controls the motor 59 to move the movable blade 62 from the blade standby position P1 to the release position P2, and executes a release process of releasing the bobbin thread end portion D held in the process of S17 of the previous main process (S12).

The CPU41 drives the motor 59 to rotate the output shaft 98 of the motor 59 from the position of fig. 10 (B) to the position of fig. 10 (C) in the clockwise direction in the bottom view. As in fig. 10 (C), the roller member 77 relatively moves from the position of fig. 10 (B) to a position rotated in the counterclockwise direction in the bottom view. The link 73 rotates in the counterclockwise direction as viewed from above about the support shaft 735, and moves the links 74 to 76. As shown in fig. 11 (C), the movable blade 62 of the cutting mechanism 60 is moved to the release position P2, and the second holding member 82 of the upper thread holding mechanism 80 is moved from the holding position Q2 to the upper thread cutting position Q3. The state in which the second holding member 82 is separated from the receiving hole 12 in the horizontal direction and the second holding member 82 overlaps the first holding member 81 in the up-down direction is maintained. The second holding member 82 is overlapped up and down with the knife portion 96 of the fixed cutter 97. When the movable blade 62 of the cutting mechanism 60 is positioned in a range from the blade standby position P1 to the release position P2, the branching portion 621 of the movable blade 62 is positioned forward of the pinhole 12.

As shown in fig. 12 (C), the needle thread holding mechanism 80 maintains a state in which the needle thread end U is bent in a side view S-shape between the first holding member 81 and the second holding member 82, and the first holding portion 86 of the second holding member 82 overlaps the fixed cutter 97 in the up-down direction. Thereby, the upper thread end U is cut by the fixed cutter 97. The first holding member 81 and the second holding member 82 continue to hold the upper thread end U while the second holding member 82 moves from the holding position Q2 to the upper thread cutting position Q3. Accordingly, the upper thread end U is cut by the fixed cutter 97 in a state of being held by the first and second holding members 81 and 82. The position at which the upper thread to be cut by the fixing cutter 97 is cut is a portion upstream, i.e., above, of the position at which the upper thread is held by the first holding member 81 and the second holding member 82. As shown in fig. 13 (C), the wire releasing portion 68 of the movable blade 62 of the cutting mechanism 60 is spaced apart from and faces the pressing portion 653 of the biasing member 65 in the up-down direction. The wire holding portion 66 moves to a state of being retracted with respect to the pressing portion 653 of the biasing member 65, and the state of holding the base wire end portion D in the up-down direction together with the biasing member 65 is released. Thereby, the upper thread end U held by the upper thread holding mechanism 80 at the start of sewing is released after cutting near the needle accommodating hole 12, and the lower thread end D held by the cutting mechanism 60 is released.

The CPU41 drives the motor 59 to move the movable blade 62 of the cutting mechanism 60 to the blade standby position P1, and moves the second holding member 82 of the upper thread holding mechanism 80 to the standby position Q1 (S13). The CPU41 rotates the output shaft 98 of the motor 59 from the position of fig. 10 (C) to the position of fig. 10 (a) in the counterclockwise direction from the bottom view.

The CPU41 determines whether or not the next needle falling operation of the needle 15 is the last needle of the sewing operation (S14). The CPU41 counts the number of stitches of the sewing pattern currently being sewn and stores it in the RAM43. Accordingly, the CPU41 can determine whether or not the next needle falling operation is the last needle by referring to the sewing information of the sewing pattern stored in the ROM 42. If the needle is not the last needle (S14: NO), the CPU41 returns the process to S14, and continues the sewing operation. In the case of the last needle (S14: yes), the CPU41 stops the main motor 17 (S15).

The CPU41 controls the motor 59 to move the movable blade 62 from the blade standby position P1 to the movable end position P4 and then to the cutting position P3, and executes the thread cutting process for cutting the upper thread and the lower thread (S16). The CPU41 drives the motor 59, rotates the output shaft 98 of the motor 59 from the position of fig. 10 (a) to the position of fig. 14 (a) in the clockwise direction from the bottom view, and moves the movable blade 62 from the blade standby position P1 to the movable end position P4. As in fig. 14 (a), the roller member 77 moves to the right end portion of the grooved cam 71 (the end portion on the opposite side of the left end portion of the grooved cam 71 of fig. 10 (a)). The link 73 rotates in the counterclockwise direction as viewed from above about the support shaft 735, and moves the links 74 to 76. As shown in fig. 15 (a), the movable blade 62 of the cutting mechanism 60 is moved to the movable end position P4. The knife portion 622 of the movable knife 62 is located behind the support shaft 69 and behind the pinhole 12. The wire holding portion 66 and the wire releasing portion 68 of the movable blade 62 are disposed at positions retracted relative to the urging member 65. The part of the movable blade 62 passes over the first holding member 81 in the process of moving from the blade standby position P1 to the movable end position P4. The second holding member 82 of the needle thread holding mechanism 80 moves to the movable end time position Q5. The second holding member 82 is separated from the receiving hole 12 in the horizontal direction, and the second holding member 82 is not overlapped with the first holding member 81 and the fixed cutter 97 in the up-down direction. The branching portion 621 of the movable blade 62 of the cutting mechanism 60 is located rearward of the support shaft 69 and rearward of the pinhole 12. The branching portion 621 of the movable blade 62 of the cutting mechanism 60 is located forward of the pin 764 and does not interfere with the second holding member 82.

The CPU41 drives the motor 59, rotates the output shaft 98 of the motor 59 from the position of fig. 14 (a) to the position of fig. 14 (B) in the counterclockwise direction from the bottom view, and moves the movable blade 62 from the movable end position P4 to the cutting position P3. As shown in fig. 14 (B), the roller member 77 is relatively moved from the right end portion of the slot cam 71 to a position moved clockwise in the bottom view. The link 73 rotates in the clockwise direction from the position shown in fig. 14 (a) about the support shaft 735, and moves the links 74 to 76. As shown in fig. 15 (B), the movable blade 62 of the cutting mechanism 60 moves to the cutting position P3. The knife portion 622 of the movable knife 62 is located at a position overlapping the pinhole 12 up and down. The front portions of the wire holding portion 66 and the wire releasing portion 68 of the movable blade 62 are disposed at positions retracted relative to the urging member 65. The second holding member 82 of the needle thread holding mechanism 80 moves to the cut-off time position Q4. The second holding member 82 is separated from the receiving hole 12 in the horizontal direction, and the second holding member 82 is not overlapped with the first holding member 81 and the fixed cutter 97 in the up-down direction. When the movable blade 62 of the cutting mechanism 60 is positioned in a range from the movable end position P4 to the cutting position P3, the branching portion 621 of the movable blade 62 is positioned behind the pinhole 12.

The CPU41 controls the motor 59 to move the movable blade 62 from the cutting position P3 to the blade standby position P1, and performs a clamping process of clamping the base wire end portion D cut in the wire cutting process by the urging member 65 and the wire clamping portion 66 (S17). The CPU41 drives the motor 59, rotates the output shaft 98 of the motor 59 from the position (B) of fig. 14 in the counterclockwise direction from the position (a) of fig. 10, and moves the movable blade 62 from the cutting position P3 to the blade standby position P1. The link 73 rotates in the clockwise direction from the position (B) of fig. 14 about the support shaft 735, and moves the links 74 to 76. In the process of moving from the cutting position P3 to the knife standby position P1, the movable knife 62 is guided by the guide portions 654 and 655 of the biasing member 65 while the base thread end portion D cut in S16 is disposed on the thread holding portion 66, and the thread holding portion 66 is disposed between the biasing member 65 and the needle plate 11. As a result, as shown in fig. 13 (a), when the movable blade 62 moves from the cutting position P3 to the blade standby position P1, the wire end D is sandwiched between the wire clamping portion 66 of the movable blade 62 and the pressing portion 653 of the biasing member 65. The wire end D is held by the wire holding portion 66 of the movable blade 62 and the pressing portion 653 of the urging member 65 until S12 of the next main process is performed. The CPU41 ends the main processing so far.

In the above embodiment, the sewing device 1, the needle plate 11, the needle accommodating hole 12, the needle bar 14, the needle 15, the needle bar mechanism 30, and the CPU41 are examples of the sewing device, the needle plate, the needle accommodating hole, the needle bar, the needle bar mechanism, and the control device of the present invention, respectively. The upper thread holding mechanism 80, the first holding member 81, the second holding member 82, the first holding portion 86, the second holding portion 87, the supporting portion 84, the motor 59, and the moving portion 67 are examples of the upper thread holding mechanism, the first holding member, the second holding member, the first holding portion, the second holding portion, the supporting portion, the motor, and the holding moving portion of the present invention, respectively. The insertion portions 88, 89 are examples of the insertion portion of the present invention. The cutting mechanism 60, the fixed blade 61, the movable blade 62, and the support shaft 69 are examples of the cutting mechanism, the fixed blade, the movable blade, and the rotation center of the present invention. The knife standby position P1, the cutting position P3, the movable end position P4, the standby position Q1, and the holding position Q2 are examples of the knife standby position, the cutting position, the movable end position, the standby position, and the holding position of the present invention, respectively. The process of S9 is an example of the upper thread holding control process of the present invention.

In the sewing device 1 of the above embodiment, the upper thread holding mechanism 80 includes the first holding member 81, the second holding member 82, and the moving portion 67. The first holding member 81 is provided below the needle plate 11, and the needle plate 11 is formed with a needle accommodating hole 12 through which the needle 15 of the sewing device 1 is inserted. The second holding member 82 holds the upper thread end U of the upper thread in cooperation with the first holding member 81. The second holding member 82 includes a first holding portion 86, a second holding portion 87, and a supporting portion 84. The first holding portion 86 is provided below the needle plate 11 and above the first holding member 81. The second holding portion 87 is provided below the first holding member 81. The support portion 84 supports the first holding portion 86 and the second holding portion 87 so as to be movable in the horizontal direction. The moving portion 67 has a motor 59, and moves the second holding member 82 in the horizontal direction by the power of the motor 59. The moving section 67 moves the second holding member 82 to the standby position Q1 and the holding position Q2. The standby position Q1 is a position when the pin hole 12 is arranged between the first holding member 81 and the second holding member 82 in the horizontal direction. In the holding position Q2, the second holding member 82 is separated from the receptacle hole 12 in the horizontal direction. The needle thread holding mechanism 80 can hold the needle thread end U in a state of being bent in an S-shape along the first holding member 81 and the second holding member 82 by positioning the second holding member 82 at the holding position Q2. The needle thread holding mechanism 80 can lengthen the length of the portion held by the needle thread holding mechanism 80 as compared with a mechanism that holds the needle thread end U without bending the needle thread end U in an S-shape, and therefore, the possibility that the needle thread end U is caught in a stitch can be reduced as compared with the conventional one.

The first holding portion 86 is formed with an insertion portion 88 that allows the needle 15 to pass through when the second holding member 82 is located at the standby position Q1, and the second holding portion 87 is formed with an insertion portion 89 that allows the needle 15 to pass through when the second holding member 82 is located at the standby position Q1. The needle thread holding mechanism 80 can more stably hold the needle thread end U by guiding the needle thread end U to a position held by the first holding member 81 and the second holding member 82 when the second holding member 82 moves to the holding position Q2 by the insertion portion 88 provided in at least one of the first holding portion 86 and the second holding portion 87.

The support portion 84 of the second holding member 82 is a pin member that is perpendicular to the needle plate 11, and the second holding member 82 is rotatably supported by the needle plate 11 through the support portion 84, and is rotatable about the support portion 84 to the standby position Q1 and the holding position Q2. The needle thread holding mechanism 80 can stably move the second holding member 82 to the standby position Q1 and the holding position Q2 around the supporting portion 84.

The support portion 84 is provided on the motor 59 side with respect to the needle hole 12, that is, is provided rearward with respect to the needle hole 12 in a direction from the motor 59 toward the needle hole 12 on a surface parallel to the needle plate 11. The needle thread holding mechanism 80 can improve the degree of freedom in design of the opposite side of the needle hole 12 to the motor 59 side.

The sewing device 1 includes a needle bar mechanism 30, a needle plate 11, and a knitting yarn holding mechanism 80. The needle bar mechanism 30 has a needle bar 14 to which the machine needle 15 is attached at the lower end, and swings the needle bar 14 in the up-down direction. The needle plate 11 is formed with a needle accommodating hole 12 through which the needle 15 is inserted. In the sewing device 1, the second holding member 82 of the upper thread holding mechanism 80 is positioned at the holding position Q2, so that the upper thread end U can be held in a state of being bent in an S-shape along the first holding member 81 and the second holding member 82. In the sewing device 1, the length of the portion held by the needle thread holding mechanism 80 can be increased as compared with a mechanism that holds the needle thread end U without bending it in an S-shape, and therefore, the possibility that the needle thread end U is involved in a stitch can be reduced as compared with the conventional one.

The sewing device 1 is provided with a cutting mechanism 60 for cutting the upper thread and the lower thread. The cutting mechanism 60 includes a fixed blade 61, a movable blade 62, and a moving portion 67. The fixed knife 61 is fixed below the needle plate 11. The movable blade 62 is provided rotatably in the horizontal direction with respect to the fixed blade 61, and is movable between a blade standby position P1 at a position separated from the fixed blade 61, a cutting position P3 at which the fixed blade 61 intersects to cut the upper thread and the lower thread, and a movable end position P4 at a side opposite to the blade standby position P1 with respect to the cutting position P3. The moving unit 67 moves the movable blade 62 by the power of the motor 59. In the sewing device 1, the power of the upper thread holding mechanism 80 is shared with the cutting mechanism 60, so that the structure can be simplified as compared with the sewing device 1 in which the power of the upper thread holding mechanism 80 and the power of the cutting mechanism 60 are independently provided. In the sewing machine 1, the link mechanism 72 of the needle thread holding mechanism 80 is shared with the cutting mechanism 60, so that the structure can be simplified and the degree of freedom in designing the space below the needle plate 11 can be improved as compared with the case where both are independent.

The support shaft 69 of the movable blade 62 is provided on the opposite side of the needle hole 12 from the motor 59 side in the direction from the motor 59 toward the needle hole 12 on the surface parallel to the needle plate 11. In the sewing device 1, the second holding member 82 of the needle thread holding mechanism 80 rotates around the support shaft 69 located on the motor 59 side with respect to the needle hole 12, so that the possibility of interference between the needle thread holding mechanism 80 and the cutting mechanism 60 can be reduced, and the degree of freedom in design of the motor 59 side with respect to the needle hole 12 can be improved.

The movable knife 62 of the sewing device 1 and the first holding portion 86 are disposed on the same horizontal plane. When the movable blade 62 moves to the cutting position P3, the second holding member 82 does not need to be moved to the cutting position Q4, but when the movable blade 62 is positioned at the cutting position P3 and the second holding member 82 is positioned at the standby position Q1, the movable blade 62 interferes with the second holding member 82. In contrast, the movable blade 62 and the second holding member 82 are coupled to the same link 76, and the support portion 84 and the support shaft 69 are located on the front side of the needle hole 12, i.e., on the front side, with respect to the link 76. Therefore, when the movable blade 62 rotates about the support shaft 69, the second holding member 82 also rotates about the support portion 84. When the movable blade 62 moves from the blade standby position P1 to the cutting position P3, the end portions of the second holding member 82 on the insertion portions 88, 89 side rotate in the counterclockwise direction in the bottom view around the supporting portion 84, and move to the side away from the needle accommodating hole 12. Therefore, when the movable blade 62 is positioned at the cutting position P3, the second holding member 82 moves to the cutting position Q4, and the movable blade 62 and the second holding member 82 do not interfere with each other. Accordingly, in the sewing apparatus 1, the upper thread holding mechanism 80 and the cutting mechanism 60 can be compactly arranged with a relatively simple structure.

After the first needle sewing and before the second needle sewing, the CPU41 performs the upper thread holding control process of moving the second holding member 82 from the standby position Q1 to the holding position Q2 (S9). In the sewing device 1, after the first needle sewing and before the second needle sewing, the second holding member 82 is moved from the standby position Q1 to the holding position Q2, whereby the upper thread end U can be held.

The upper thread holding mechanism and the sewing device of the present invention can be variously modified in addition to the above-described embodiments. The structures of the sewing device 1 and the knitting yarn holding mechanism 80 may be changed as appropriate, and for example, the sewing device 1 may not include at least one of the cloth feeding device 5, the cutting mechanism 60, the fixing cutter 97, and the display unit 13. The structures, shapes, sizes, arrangements, and the like of the first holding member 81 and the second holding member 82 may be changed as appropriate. The first holding portion 86 and the second holding portion 87 may be integral members. At least one of the first holding portion 86 and the second holding portion 87 may not be formed with insertion portions 88 and 89 that allow the needle 15 to pass through when the second holding member 82 is located at the standby position Q1. The planar shape of the insertion portions 88, 89 may be such that the upper thread end portion U is restricted from moving in a direction orthogonal to the moving direction of the second holding member 82 in the process of moving the second holding member 82 from the standby position Q1 to the holding position Q2. The shape of the insertion portions 88, 89 in plan view may be, for example, holes of arbitrary shape penetrating in the vertical direction. The insertion portions 88, 89 may have the same shape as each other or may have different shapes from each other. The first holding member 81 may be formed with a notch, a through hole, or the like through which the needle 15 is allowed to pass. The first holding portion 86 may not be provided on the same horizontal plane as the movable blade 62. The standby position Q1 and the holding position Q2 may be appropriately changed with respect to the position of the second holding member 82. The second holding member 82 may be separated from the receiving hole 12 and the first holding member 81 in the horizontal direction when the second holding member 82 is at the standby position Q1. The support portion 84 may be a cylindrical member as long as it can rotatably support the second holding member 82. The support portion 84 may be fixed to the opposite side of the receptacle hole 12 from the motor 59 side, that is, the front side.

The structure of the cutting mechanism 60 may be changed as appropriate. The cutting mechanism 60 may not include at least one of the biasing member 65, the thread holding portion 66, and the thread releasing portion 68, and in S17, the bobbin thread end D may not be held between the biasing member 65 after the upper thread and the bobbin thread are cut. The cutting mechanism 60 may be operated by a motor power different from the motor 59 of the needle thread holding mechanism 80, or the movable blade 62 may be moved by a power of the motor 59 via a power transmission member different from the link mechanism 72. The correspondence between the position of the movable blade 62 of the cutting mechanism 60 and the position of the second holding member 82 of the upper thread holding mechanism 80 can be changed appropriately. The urging member 65 may be a structure other than a leaf spring such as a coil spring. The support shaft 69 may be fixed to the motor 59 side, i.e., the rear side, with respect to the receptacle hole 12.

The program including the instruction for causing the sewing apparatus 1 to perform the main process may be stored in the storage device 45 before the CPU41 executes the program. Therefore, the program acquisition method, the acquisition path, and the device storing the program can be changed as appropriate. The program executed by the CPU41 may be received from another device by cable or wireless communication, and stored in a nonvolatile memory device. Other devices include PCs, servers connected via a network.

Some or all of the processing performed by the sewing apparatus 1 may be performed by an electronic device (for example, ASIC) other than the CPU 41. The processing performed by the sewing apparatus 1 may be distributed processing by a plurality of electronic devices (e.g., a plurality of CPUs). The steps of the processing performed by the sewing device 1 can be changed in order, omitted, and added as needed. The scope of the invention also includes the following ways: some or all of the respective processes are performed by an Operating System (OS) or the like operating on the sewing apparatus 1 by instructions of the CPU 41.

If the sewing device 1 does not include the fixing cutter 97, the CPU41 may determine whether or not the loosening timing is the loosening timing of the upper thread end portion U in S10, and release the upper thread end portion U from being held by the upper thread holding mechanism 80 if the loosening timing is the loosening timing. In this case, the CPU41 may move the second holding member 82 to the standby position Q1 as a process of releasing the holding of the upper thread end U. The timing of releasing the bobbin thread end portion D by the cutting mechanism 60 and the timing of releasing or cutting the upper thread end portion U may be the same as each other or may be different from each other. In the case where the sewing device 1 does not include the cutting mechanism 60, the sewing device 1 may omit the processing of S16 and S17. The sewing device 1 may not rotate the second holding member 82 in the processes of S16 and S17.

The fixed cutter 97 may be positioned below the first holding member 81, and when the second holding member 82 moves from the holding position Q2 to the upper thread cutting position Q3, the second holding portion 87 of the second holding member 82 and the fixed cutter 97 may overlap in the vertical direction to cut the upper thread. In this case, the position at which the upper thread to be cut by the fixing cutter 97 is cut is a portion downstream, i.e., lower, of the position at which the upper thread is held by the first holding member 81 and the second holding member 82. In addition, even if the upper thread is cut, the upper thread is held by the first holding member 81 and the second holding member 82 at a position upstream of the cutting portion, and therefore, even if the upper thread cutting process is performed before the needle fall of the third needle, the upper thread does not come out from the container needle hole 12.

The above modifications may be appropriately combined within a range not contradictory. The technology disclosed in the present specification can be realized in various forms, and for example, can be realized in forms such as a control method of a sewing apparatus, a computer program for realizing the method, and a recording medium on which the computer program is recorded.

Claims (8)

1. A needle thread retaining mechanism is characterized in that,

the upper thread holding mechanism comprises:

A first holding member provided below a needle plate formed with a needle accommodating hole through which a needle of the sewing device is inserted;

a second holding member that holds a thread end of an upper thread in cooperation with the first holding member, the second holding member having a first holding portion provided below the needle plate and above the first holding member, a second holding portion provided below the first holding member, and a support portion that supports the first holding portion and the second holding portion so as to be movable in a horizontal direction; and

and a holding moving portion having a motor for moving the second holding member in the horizontal direction by a power of the motor, the holding moving portion being capable of moving the second holding member to a standby position when the pin accommodating hole is arranged between the first holding member and the second holding member in the horizontal direction, and a holding position when the second holding member is separated from the pin accommodating hole in the horizontal direction and the second holding member overlaps the first holding member in the up-down direction.

2. An upper thread holding mechanism as recited in claim 1, wherein,

at least one of the first holding portion and the second holding portion is formed with an insertion portion that allows the needle to pass therethrough when the second holding member is located at the standby position.

3. The needle thread holding mechanism as recited in claim 1 or 2, wherein,

the support portion of the second holding member is a pin member plumbed to the needle plate,

the second holding member is rotatably supported by the needle plate via the supporting portion, and is rotatable about the supporting portion to the standby position and the holding position.

4. An upper thread holding mechanism according to claim 3, wherein,

the support portion is provided on the motor side with respect to the Rong Zhenkong in a direction from the motor toward the needle accommodating hole on a surface parallel to the needle plate.

5. A sewing device is characterized in that,

the sewing device comprises:

a needle bar mechanism having a needle bar to which a machine needle can be attached at a lower end, the needle bar being swingable in an up-down direction;

a needle plate formed with a needle accommodating hole through which the needle is inserted; and

The needle thread retaining mechanism of any one of claims 1 to 4.

6. The sewing apparatus of claim 5, wherein the sewing machine is configured to perform the sewing operation,

the sewing device is provided with a cutting mechanism for cutting the upper thread and the lower thread, the cutting mechanism is provided with a fixed knife and a movable knife,

the fixed knife is fixed below the needle plate,

the movable blade is provided rotatably in the horizontal direction with respect to the fixed blade, and is movable between a blade standby position at a position separated from the fixed blade, a cutting position at which the fixed blade intersects the fixed blade to cut the upper thread and the lower thread, and a movable end position at a side opposite to the blade standby position with respect to the cutting position,

the movable blade moves by the power of the motor.

7. The sewing apparatus of claim 6, wherein the sewing machine is configured to perform the sewing operation,

the center of rotation of the movable blade is provided on the opposite side of the Rong Zhenkong from the motor side in a direction from the motor toward the needle receiving hole on a surface parallel to the needle plate.

8. The sewing apparatus of any of claims 5-7, wherein the sewing machine is configured to perform the sewing operation,

the sewing device further comprises a control device for executing the upper thread holding control process for moving the second holding member from the standby position to the holding position after the first needle sewing and before the second needle sewing.