EP2524987B1 - Nähmaschine - Google Patents

Nähmaschine Download PDF

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Publication number
EP2524987B1
EP2524987B1 EP20120168200 EP12168200A EP2524987B1 EP 2524987 B1 EP2524987 B1 EP 2524987B1 EP 20120168200 EP20120168200 EP 20120168200 EP 12168200 A EP12168200 A EP 12168200A EP 2524987 B1 EP2524987 B1 EP 2524987B1
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EP
European Patent Office
Prior art keywords
knife
link member
cloth
sewing machine
end portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP20120168200
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English (en)
French (fr)
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EP2524987A1 (de
Inventor
Shinichi Sakamoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Juki Corp
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Juki Corp
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Publication date
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Publication of EP2524987A1 publication Critical patent/EP2524987A1/de
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Publication of EP2524987B1 publication Critical patent/EP2524987B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B65/00—Devices for severing the needle or lower thread

Definitions

  • the present invention relates to a sewing machine equipped with a lower thread cutting device disposed inside a bed.
  • a sewing machine according to a related art is disclosed in, for example, JP2003-154184A .
  • the thread cutting device 100 includes a lower moving knife 101 including an edge portion 101A and an upper moving knife 102 including an edge portion 102A.
  • the lower moving knife 101 and the upper moving knife 102 are supported rotatably around a horizontal axis.
  • the thread cutting device 100 further includes a guide member 103 for guiding the lower thread T to the position between the edge portions 101A, 102A.
  • the guide member 103 extends above the upper moving knife 102. Specifically, when the moving knives 101 and 102 advance so as to cross the path of the lower thread T, the guide member 103 moves integrally with the moving knives 101 and 102 and pushes the lower thread T down so as to position the lower thread T on the path of both moving knives 101 and 102.
  • the lower thread T slides on the guide member 103, and the lower thread T enters the space between the guide member 103 and the upper moving knife 102 and deviates from the path of the edge portions 101A, 102A, and it becomes impossible to cut the lower thread T.
  • An object of the present invention is to provide a sewing machine capable of reliably cutting a lower thread without using a guide member that is provided integrally with a pair of moving knives.
  • a sewing machine includes a cloth feed base on which a cloth is placed, a stitch forming means for forming stitches by an upper thread and a lower thread on the cloth placed on the cloth feed base, and a thread cutting device disposed below the cloth feed base and having a lower knife and an upper knife that cuts the lower thread in cooperation with the lower knife.
  • the cloth feed base has a bulged portion protruding upward to separate the lower thread and the cloth from each other.
  • the bulged portion has a portion defining at least a part of a gap portion serving as a movement path of the upper knife, the movement path being above the lower surface of the cloth feed base.
  • the bulged portion protruding upward is provided on the cloth feed base to separate the lower thread and the cloth, and the bulged portion is provided to form a gap portion serving as the movement path of the upper knife and the lower knife, so that the upper knife can be guided to the gap formed between the thread and the cloth by the bulged portion, and the lower thread can be reliably cut.
  • the lower thread path may be arranged along the cloth feed base (along the cloth), that is, along the horizontal direction.
  • the upper and lower knives move below the cloth feed base, so that if the lower thread path is made parallel to the cloth feed base, the lower thread cannot be captured by the upper and lower knives.
  • the movement path of the upper and lower knives can reliably capture and cut the lower thread, so that the lower thread can be reliably cut, and the remaining length of the thread connected to the cloth can be shortened. Further, even without using a guide member provided integrally with the upper and lower knives, the lower thread can be reliably cut.
  • a sewing machine 10 according to an embodiment shown in Fig. 1 and Fig. 2 is an automatic-control eyelet sewing machine that forms overlock stitches and a buttonhole B on a cloth H.
  • the sewing machine 10 includes a bed portion 11 having a substantially rectangular box shape, a vertical drum portion 12 provided on the rear portion of the bed portion 11, an arm portion 13 extending forward substantially parallel to the bed portion 11 from the upper portion of the vertical drum portion 12, a cloth feed base 16 on which a cloth (workpiece) H is placed and which moves the cloth within a horizontal plane, a cloth presser 17 that presses the cloth H against the upper surface of the cloth feed base 16, a cloth cutting knife 41 for forming a buttonhole and a knife receiver 42.
  • the upper shaft is provided to extend in the front-rear direction (Y direction in Fig. 1 ) of the arm portion 13 inside the arm portion 13.
  • the upper shaft that is rotated by a main shaft motor not illustrated is provided to extend in the front-rear direction.
  • a lower shaft is connected to the upper shaft via a transmission mechanism including a timing belt, and a rotative force of the upper shaft is transmitted via the transmission mechanism to rotate the lower shaft.
  • a needle bar 15 is provided so as to be moved up and down by a known needle bar up-down drive mechanism (not illustrated) that is driven by the upper shaft and to be moved for needle oscillation in the left-right direction (X direction in Fig. 2 ) by a known needle oscillation mechanism (not illustrated).
  • a sewing machine needle 14 is fixed, and through a thread insertion hole at the tip end (lower end) of the sewing machine needle 14, an upper thread is inserted.
  • the sewing machine needle 14 projects downward and withdraws by penetrating through an eye (not illustrated) made in a throat plate 11A ( Fig. 2 ) provided in the bed portion 11 according to up-down movements of the needle bar 15.
  • the needle oscillation mechanism has a conventional configuration that enables mechanical adjustment of the needle oscillation width.
  • a looper (not illustrated) having a hole on the tip end through which the lower thread T2 is inserted is provided just below the throat plate 11A.
  • the looper is connected to the lower shaft and swings in synch with the up-down movements of the needle bar 15.
  • the sewing machine needle 14 and the looper form a stitch forming means.
  • the stitch forming means in the present invention is not limited to the sewing machine needle 14 and looper of the present embodiment, and includes other known stitch forming means.
  • the needle bar 15 and the looper are connected to a turning mechanism 71 having a turning pulse motor and a timing belt, rotate around a vertical axis in synch with each other, and accordingly, eyelet sewing stitches are formed on the peripheral edge portion of an droplet-shaped eyelet forming a part of a buttonhole.
  • the cloth feed base 16 that is in a hollow rectangular shape as a whole is provided movably on the upper surface of the bed portion 11, and is movable in the left-right direction (X direction) and the front-rear direction (Y direction) by operations of an X-axis pulse motor and a Y-axis pulse motor provided inside the bed portion 11.
  • a cloth H can be placed on the upper surface of the cloth feed base 16, and the cloth presser 17 is provided on the cloth feed base 16 so as to move up and down to press or release the cloth H against or from the upper surface of the cloth feed base 16.
  • the cloth presser 17 presses both sides of buttonhole stitches that should be formed on the cloth H.
  • This cloth feed base 16 is set so that the cloth cutting knife 41 and the knife receiver 42 face each other above and below a position at which the buttonhole B is to be formed on the cloth H placed on the upper surface of the cloth feed base in a state where the cloth feed base is positioned at a predetermined origin, and at this position, the buttonhole B is formed.
  • the cloth feed base 16 moves to a sewing start position ahead (right in Fig. 2 ) of the origin according to starting of the sewing machine, and is driven so that the cloth H placed on the cloth feed base 16 relatively moves to a necessary position just below the sewing machine needle 14.
  • the needle bar 15, the looper, and the turning mechanism 71 are driven, and accordingly, overlock stitches are formed around the buttonhole B.
  • the cloth feed base 16 moves in the Y direction from the final stitch formed position, and moves the cloth so that the portion at which the buttonhole B is to be formed comes to a position facing the cloth cutting knife 41 and the knife receiver 42, and the state shown in Fig. 2 is obtained.
  • the lower thread T2 extends along the Y direction.
  • the cloth cutting knife 41 is disposed on one side (rear side) in the Y direction of the position at which the looper is provided in the bed portion 11, and disposed at a position matching the origin of the cloth feed base 16 as described above.
  • the knife receiver 42 moves down toward the cloth cutting knife 41 by an operation of a drive means (not illustrated) such as an air cylinder.
  • a drive means such as an air cylinder.
  • the cloth H set between the knife receiver 42 and the cloth cutting knife 41 is pushed and cut, and accordingly, the buttonhole B is formed.
  • a bulged portion 161 long in the Y direction and divided substantially bilaterally symmetrically is formed.
  • the cloth cutting knife-side end edge of this bulged portion 161 is formed straight along the X direction, and protrudes upward so that a level difference is formed between this and the upper plane surface of the cloth feed base 16. Accordingly, as shown in Fig. 13 , the cloth H on the cloth feed base 16 is bent at the boundary between the upper end face of the cloth feed base 16 and the upper surface of the bulged portion 161.
  • a substantially oval hole portion 162 opened so as to expose the upper side of the throat plate 11A and a guide hole portion 162A opened on the Y-axis direction line passing through the center of the hole portion 162 are formed along the Y direction.
  • the oval shape along the Y direction of the hole portion 162 is for allowing the throat plate 11A to relatively move according to movement of the cloth feed base 16.
  • the lower thread T2 passing between the cloth H and the throat plate 11A passes through the inside of the guide hole portion 162 and becomes almost straight.
  • the cloth H positioned on the upper end face of the cloth feed base 16 and pressed by the cloth presser 17 is bent at the boundary with the upper surface of the bulged portion 161. Therefore, the paths of the bent cloth H and the lower thread T2 are separated up and down at the bulged portion 161.
  • the cloth feed base 16 includes the bulged portion 161 protruding upward for separating the lower thread T2 and the cloth H from each other and a groove 163 that is formed in the bulged portion 161 along the X direction and forms a gap portion as a movement path above the lower surface of the cloth feed base 16 of the movement path of the upper knife 52.
  • the bulged portion 161 is fixed to the cloth feed base 16 via a cloth feed plate by attaching screws not illustrated in a plurality of fixation holes provided along the front-rear direction. By selecting fixation holes, the attaching position of the bulged portion 161 can be changed along the front-rear direction Y.
  • the sewing machine 10 includes an upper thread cutting device (not illustrated) that cuts the upper thread T1 and a lower thread cutting device 50 (thread cutting device) that cuts the lower thread T2.
  • the upper thread cutting device may use a known thread cutting structure, so that description thereof is omitted.
  • the lower thread cutting device 50 is disposed below the cloth feed base 16 as shown in Fig. 1 .
  • the lower thread cutting device 50 includes a lower knife 51 in a narrow and long plate shape having an edge portion 51A formed on the tip end lower side edge, an upper knife 52 in a narrow and long plate shape having an intermediate portion joined rotatably to the lower knife 51 by a support shaft 56 and an edge portion 52A formed on the tip end upper side edge, an air cylinder 53 as an actuator fixed to the bed 11, a link mechanism 54 that transmits extending and contracting movements of the air cylinder 53 to the lower knife 51 and the upper knife 52 and rotates the lower knife 51 and the upper knife 52 around the support shaft 56 to make the edge portions 51A and 52A approach and separate from each other (open and close), and a support base 55 that is fixed to the bed 11 and support the components described above.
  • the support base 55 formed by bending a plane plate material includes a bottom portion 553 extending horizontally, a first wall portion 551 as a wall portion that is bent along the X direction line from the bottom portion 553 to stand to support the link mechanism 54, and a second wall portion 552 that is bent along the Y direction line from the bottom portion 553 to stand to fix and support the air cylinder 53.
  • a plurality of slots 554 extending in the Y direction are formed, and the support base is fixed to and positioned on the bed portion 11 (sewing machine frame) by inserting fixation screws 555 (guide members) through the slots 554.
  • fixation screws 555 guide members
  • the guide members are not limited to screws, and may be other known members fixable to the bed portion 11.
  • the thread cutting position is adjustable along the front-rear direction.
  • the air cylinder 53 includes a pair of rods 531 that can extend and contract in the up-down direction, and to the upper portions of the pair of rods 531, an engagement piece 532 bent in a substantially L shape is fixed. To the bent portion of the engagement piece 532, the link mechanism 54 is joined.
  • the link mechanism 54 includes a first link mechanism and a second link mechanism.
  • the first link mechanism includes a first link member 541 and an L-shaped thread cutting lever 542.
  • the first link member 541 extends in the up-down direction.
  • the first link member 541 has an upper end portion joined to and supported on the engagement piece 532 rotatably, and a lower end portion joined to the thread cutting lever 542.
  • the thread cutting lever 542 has a horizontal end portion joined to the lower end portion of the first link member 541, and an intermediate portion supported rotatably on the first wall portion 551 by a support shaft 543.
  • the first link mechanism is disposed on the inner wall surface side of the first wall portion 551.
  • a slot 544 long along the longitudinal direction (up-down direction) is formed.
  • the second link mechanism of the link mechanism 54 includes a second link member 545 and a third link member 546.
  • the second link member 545 has a lower end portion supported rotatably on the first wall portion 551 and an upper end portion joined rotatably to the base end portion of the upper knife 52.
  • the third link member 546 has a lower end portion supported rotatably on the first wall portion 551 and an upper end portion joined rotatably to the center portion side of the upper knife 52.
  • the second link mechanism is disposed on the outer wall surface side of the first wall portion 551.
  • the second link member 545 and the third link member 546 are parallel to each other.
  • a convex portion 547 convexed outward is formed at the center portion of the third link member 546.
  • the lower end portion of the fourth link member 548 that joins the third link member 546 and the lower knife 51 is joined rotatably.
  • the upper end portion of the fourth link member 548 is joined rotatably to the base end portion of the lower knife 51 by a support shaft 57.
  • a pin 549 is attached, and the pin 549 fits in the slot 544 of the thread cutting lever 542 slidably in the longitudinal direction and rotatably.
  • This pin 549 transmits the swing of the thread cutting lever 542 around the support shaft 543 to the fourth link member 548, so that the fourth link member 548 swings the third link member 546 by following the swing of the thread cutting lever 542. Accordingly, the second link 545 and the third link member 546 swing around their lower ends, and the upper knife 52 swings in the X direction.
  • the support shaft 57 supporting the pin 549 is joined to the lower knife 51, so that the lower knife 51 swings around the support shaft 56, and both edge portions 52A and 51A open and close (approach or separate from each other).
  • the link mechanism 54 includes a second link member 545 having one end portion joined rotatably to the base end portion of the upper knife 52 and the other end portion supported rotatably on the wall portion 551, and a third link member 546 provided parallel to the second link member 545 and having one end portion joined rotatably to the center portion of the upper knife 52 and the other end portion supported rotatably on the wall portion 551, and the upper knife 52 and the lower knife 51 is opened and closed by a pantograph mechanism formed by the second link member 545, the third link member 546, the upper knife 52, and the wall portion 551.
  • the link mechanism 54 includes the thread cutting lever 542 having one end portion supported rotatably on the wall portion 551 and the other end portion in which a slot 544 is formed, and the fourth link member 548 having one end portion joined rotatably to the lower knife 51 via the slot 544 of the thread cutting lever 542 and the other end portion joined rotatably to the third link member 546, and the lower knife 51 is interlocked with the thread cutting lever 542 and the pantograph mechanism is also interlocked with the thread cutting lever 542 by a toggle mechanism formed by the upper knife 52, the fourth link member 548, and the thread cutting lever 542.
  • Fig. 4 to Fig. 6 show a case where the lower knife 51 and the upper knife 52 are in a closed state.
  • the rods 531 of the air cylinder 53 extend and the engagement piece 532 is positioned at the upper position.
  • the engagement piece 532 moves down, so that the first link member 541 whose upper end is supported by the engagement piece 532 also moves down to rotate the thread cutting lever 542 in the arrow Y1 direction.
  • the rotative movement is transmitted to the fourth link member 548 via the pin 549, and the fourth link member 548 also moves in the arrow Y1 direction ( Fig. 7 ). Accordingly, the second link member 545, the third link member 546, the lower knife 51, and the upper knife 52 also move in the arrow Y1 direction. At this time, the pin 549 slides inside the slot 544, so that the positional relationship between the lower knife 51 and the upper knife 52 changes and they open as shown in Fig. 8 and Fig. 9 .
  • a pantograph mechanism is formed by the second link member 545, the third link member 546, the upper knife 52, and the first wall portion 551.
  • This pantograph mechanism is interlocked by a toggle mechanism formed by the upper knife 52, the fourth link member 548, and the thread cutting lever 542.
  • the upper knife 52 and the fourth link member 548 are moved by a biasing force of the thread cutting lever 542, and closed with respect to the lower knife 51.
  • the fourth link member 548 and the lower knife 51 form a toggle mechanism, so that at the moment of thread cutting at which the lower knife 51 and the upper knife 52 close to each other, a great force can be generated.
  • the upper knife 52 when moving the upper knife 52 to the thread cutting position by actuation of the air cylinder 53, as shown in Fig. 10 , the upper knife 52 is disposed so that its movement path is set to make the upper knife 52 enter the groove 163 of the cloth feed base 16.
  • the predetermined width K of the groove 163 is formed to a length that allows the upper knife 52 to move according to a position adjustable range of the lower thread cutting device 50.
  • the lower thread T2 and the cloth H are separated from each other by the bulged portion 161 of the cloth feed base 16 to form a space.
  • the cloth H may be left pressed by the cloth presser 17.
  • the upper knife 52 in an opened state is housed inside the groove 163 of the cloth feed base 16, so that the point of the upper knife 52 is positioned so that it can pass through the space between the lower thread T2 and the cloth H.
  • the lower thread cutting device 50 switches to a closed state, as shown in Fig. 13 , the upper knife 52 gradually shortens its distance to the lower knife 51 while being guided by the groove 163, and finally, the upper knife 52 and the lower knife 51 close to each other, and accordingly, the lower thread T2 is cut.
  • the lower thread cutting device 50 is slidable in the Y direction in the range of the lengths of the slots 554, so that by adjusting the position of the lower thread cutting device 50 before thread cutting, the cutting position of the lower thread T2 can also be adjusted.
  • the bulged portion 161 protruding upward to separate the lower thread T2 and the cloth H from each other is provided, and the groove 163 serving as a movement path of the upper knife 52 is formed in the bulged portion 161, so that the upper knife 52 can be guided into the space between the lower thread T2 and the cloth H formed by the bulged portion 161, and the lower thread T2 can be reliably cut. Therefore, without using a guide member integral with the pair of moving knives which is used in the conventional case, the lower thread T2 can be reliably cut.
  • the position at which the lower thread T2 is cut by the lower thread cutting device 50 is adjustable by sliding the support base 55a along the thread extending direction (Y direction), so that the length of the lower thread T2 after it is cut can be adjusted.
  • the upper knife 52 and the lower knife 51 are opened and closed by a pantograph mechanism, so that the upper knife 52 and the lower knife 51 can be opened and closed by a simple configuration.
  • pantograph mechanism includes a toggle mechanism, so that the thread can be reliably cut even if the external force for cutting is small.
  • the right side (lower thread cutting device 50a side) bulged portion 161a of the pair of left and right bulged portions 161a and 161b is shorter in the Y direction than the left side (opposite) bulged portion 161b.
  • a notched portion 164a extending in the X direction is formed below the portion on the inner side (cloth presser 17 side) of the bulged portion 161a so as to face this portion.
  • the bulged portion 161a is separated from the cloth presser 17 so that a gap portion 163a is formed by the end face of the notched portion 164a of the cloth feed base 16a and the inner end face of the right side bulged portion 161a.
  • This gap portion 163a becomes a movement path of the upper knife 52.
  • the inner side end portion of the bulged portion 161a has a recessed shape curved as a whole, and on the other hand, the inner side end portion of the bulged portion 161b curves only at the end portion on the front side, and the other portion is formed by straight notching. Accordingly, the region on the extension of the movement path of the upper knife 52 can be formed as a space to prevent the left side bulged portion 161b from interfering with the upper knife 52.
  • the lower thread cutting device 50A has a structure substantially similar to the structure of the lower thread cutting device 50 according to the above-described embodiment.
  • the lower thread cutting device 50A includes a lower knife 51a for cutting a thread, an upper knife 52a that is supported rotatably by the lower knife 51a, opens and closes substantially along the up-down direction, and cuts a thread in cooperation with the lower knife 51a, an air cylinder 53a as an actuator serving as a drive source, a link mechanism 54a that conducts an extending/contracting movement of the air cylinder 53a to the lower knife 51a and the upper knife 52a and makes edge portions of these lower knife 51a and upper knife 52a approach or separate from each other (open and close), and a support base 55a that supports these components.
  • the upper knife 52a is bent so that the base end portion thereof is spaced from the lower knife 51a.
  • the support base 55a includes a wall portion 551a for supporting the link mechanism 54a and a bottom portion 553a extending horizontally from the lower end portion of the wall portion 551a.
  • a block member 556a for fixing the air cylinder 53a to the bottom portion 553a is attached to the bottom portion 553a.
  • the block member 556a is fixed to the bottom portion 553a of the support base 55a by auxiliary screws 558a inserted through the through holes 557a.
  • a screw hole (not illustrated) for fixing the air cylinder 53a is formed on the surface facing the air cylinder 53a of the block member 556a.
  • a slot 556ab is formed in the Y direction (front-rear direction).
  • slots 554a along the Y direction are formed in the bottom portion 553a of the support base 55a.
  • the support base 55a is positionally adjusted along the Y direction by the slots 554a and 556ab, and fixed to the sewing machine frame at a predetermined position by fixation screws 555a.
  • the slots 554a are formed in the block member 556a, the slot 556ab is formed in the support base 55a, respectively, however, it is also easily conceived that a plurality of slots are provided in the block member 556a or the support base 55a to adjust the position of the support base 55a.
  • a pair of rods 531a of the air cylinder 53a can extend and contract in the up-down direction, and to upper portions of the pair of rods 531a, an engagement piece 532a that engages with the link mechanism 54a is attached.
  • the engagement piece 532a is fixed to the pair of rods 531a by flat head screws 69a. When the flat head screws 69a are used, space-saving can be realized more than in the case using hexagon socket head bolts.
  • One end portion of the engagement piece 532a is bent downward, and this bent portion is joined to the link mechanism 54a.
  • through holes 533a are formed to face the screw holes of the block member 556a.
  • the link mechanism 54a includes a first link member 541a whose one end portion is joined rotatably to the engagement piece 532a and an L-shaped thread cutting lever 542a joined to the other end portion of the first link member 541a, and these are disposed on the inner wall surface side of the wall portion 551a.
  • the first link member 541a transmits power of the air cylinder 53a to the thread cutting lever 542a.
  • a projection 541b is formed on the other end portion of the first link member 541a.
  • An intermediate portion of the thread cutting lever 542a is supported rotatably on the wall portion 551a by a support shaft 543a.
  • An end portion of the shorter side portion of the thread cutting lever 542a is joined rotatably to the first link member 541a, and an end portion of the longer side portion projects from the wall portion 551a.
  • a slot 544a is formed in the end portion (the other end portion) of the longer side portion of the thread cutting lever 542a.
  • the link mechanism 54a includes a second link member 545a joined to the base end portion of the upper knife 52a and a third link member 546a joined to the center portion of the upper knife 52a, and these are disposed on the outer wall surface side of the wall portion 551a.
  • the second link member 545a and the third link member 546a are parallel to each other.
  • One end portion of the second link member 545a is joined rotatably to the base end portion of the upper knife 52a, and the other end portion is supported rotatably on the wall portion 551a.
  • a slot 551b extending along the up-down direction is formed.
  • the base end portion of the upper knife 52a is bent, so that the base end portion of the upper knife 52a engages with the outer side surfaces of the second link member 545a and the third link member 546a.
  • a shaft body 546b integrated with the third link member is provided, and the center portion of the upper knife 52a is joined rotatably to this shaft body 546b via a thrust collar 60a.
  • the shaft body 546b is integrated with the third link member 546a, so that the strength can be improved, and by the thrust collar 60a, the upper knife 52a is prevented from rattling.
  • the other end portion of the third link member 546a is supported rotatably on the wall portion 551a.
  • a convex portion 547a convexed outward is formed, and to this convex portion 547a, a fourth link member 548a that joins the third link member 546a and the lower knife 51a is joined via a shoulder screw 61a.
  • the fourth link member 548a is held and joined by the shoulder screw 61a, so that the lower knife 51a can be prevented from rattling.
  • the shaft 62a of the shoulder screw 61a is eccentric with the screw head 63a.
  • the shaft 62a of the shoulder screw 61a passes through the base end portion of the lower knife 51 and is fixed to the fourth link member 548a by a set screw 64a.
  • fixation by the set screw 64a is released and the screw head 63a of the shoulder screw 61a is rotated, the shaft 62a rotates around the rotation axis of the screw head 63a, and the position of the shaft 62a changes. According to this change, the position of the base end portion of the lower knife 51a also changes, and the opening/closing position of the tip end portion of the lower knife 51 is adjusted.
  • a pin 549a that engages in the slot 544a of the thread cutting lever 542a is attached via a washer 549b and a shoulder screw 549c.
  • the shoulder screw 549c and one end portion of the fourth link member 548a hold the pin 549a therebetween, so that rattling in the axial direction is prevented.
  • the pin 549a transmits the rotative movement of the thread cutting lever 542a to the fourth link member 548a, so that the fourth link member 548a swings the third link member 546a by following the rotative movement of the thread cutting lever 542a.
  • the movement of the third link member 546a is also transmitted to the second link member 545a via the upper knife 52a, so that the upper knife 52a and the second link member 545a also swing together with the third link member 546a.
  • the fourth link member 548a moves the lower knife 51a as well, so that the lower knife 51a and the upper knife 52a have opening and closing movements.
  • Fig. 20 the case where the lower knife 51a and the upper knife 52a are in an opened state is shown.
  • the positions in the up-down direction of the lower knife 51a and the upper knife 52a can be adjusted (for example, refer to the alternate long and two short dashed line shown in Fig. 19 ).
  • the position of the other end portion of the second link member 545a changes, and the position of the upper knife 52a also changes.
  • the knife position adjustment mechanism that performs positional adjustment of the lower knife 51a and the upper knife 52a includes the slot 551b of the wall portion 551a, the rotary shaft 545c, the second link member 545a, the shoulder screw 61a, and the fourth link member 548a.
  • the lower thread cutting device 50A is provided with a stopper member 80a for adjusting the movable range of the first link member 541a.
  • the stopper member 80a includes a base portion 81a attached to the wall portion 551a and a restricting portion 82a that is bent with respect to the base portion 81a and extends in the up-down direction.
  • a pair of slots 84a extending in the up-down direction are formed, and by inserting fixation screws 85a through the slots 84a and screwing these to the wall portion 551a, the base portion 81a is fixed to the wall portion 551a.
  • fixation screws 85a By moving up and down the base portion 81a along the slots 84a via the fixation screws 85a, the position in the up-down direction of the whole stopper member 80a can be adjusted.
  • a guide hole 83a extending in the up-down direction is formed, and the projection 541b of the first link member 541a engages in this guide hole 83a.
  • the upper end position of the guide hole 83a is also adjusted, so that the top dead point of the projection 541b of the first link member 541a, that is, the movable range of the upper side of the first link member 541a can be changed.
  • the stopper member 80a that adjusts the movable range of the first link member 541a is attached to the support base 55a in a position adjustable manner, so that by adjusting the position of the stopper member 80a, the movable range of the first link member 541a can be adjusted.
  • the present invention is not limited to the embodiments described above, but is changeable as appropriate.
  • the drive source of the lower thread cutting device 50 is the air cylinder 53
  • other actuators such as a motor or solenoid can also be used as the drive source.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)

Claims (11)

  1. Nähmaschine (10), umfassend:
    eine Nähgutvorschubbasis (16, 16a), auf welcher ein Nähgut (H) platziert ist;
    ein Stichbildungsmittel (14) zum Bilden von Stichen mittels eines Oberfadens (T1) und eines Unterfadens (T2) an dem auf der Nähgutvorschubbasis (16, 16a) platzierten Nähgut (H); und
    eine Fadenschneidvorrichtung (50, 50A), welche unterhalb der Nähgutvorschubbasis (16, 16a) angeordnet ist und ein Untermesser (51, 51a) und ein Obermesser (52, 52a) aufweist, welches den Unterfaden (T2) in Zusammenwirken mit dem Untermesser (51, 51a) schneidet,
    dadurch gekennzeichnet, dass
    die Nähgutvorschubbasis (16, 16a) einen gebauchten Bereich (161, 161a) aufweist, welcher nach oben vorsteht, um den Unterfaden und das Nähgut voneinander zu trennen, und dass
    der gebauchte Bereich (161, 161a) einen Bereich aufweist, der mindestens einen Teil eines Spaltbereichs (163, 163a) definiert, welcher als Bewegungspfad des Obermessers (52, 52a) dient, wobei der Bewegungspfad oberhalb einer unteren Oberfläche der Nähgutvorschubbasis (16, 16a) liegt.
  2. Nähmaschine (10) nach Anspruch 1, wobei der Spaltbereich (163) als eine in dem gebauchten Bereich (161) gebildete Nut ausgebildet ist.
  3. Nähmaschine (10) nach Anspruch 1, wobei der Spaltbereich (163a) gebildet ist von einem ausgesparten Bereich (164a), welcher in der Nähgutvorschubbasis (16a) gebildet ist, um das Obermesser (52a) hindurchtreten zu lassen, und einem Endbereich des gebauchten Bereichs (161a).
  4. Nähmaschine (10) nach Anspruch 3, wobei die Nähgutvorschubbasis (16a) ferner einen weiteren gebauchten Bereich (161b) umfasst, welcher getrennt von dem gebauchten Bereich (161a) angeordnet ist, und wobei eine dem Spaltbereich (163a) zugewandte Fläche des anderen gebauchten Bereichs (161b) eine Form aufweist, welche von dem Bewegungspfad des Obermessers (52a) beabstandet ist.
  5. Nähmaschine (10) nach Anspruch 1, wobei die Fadenschneidvorrichtung (50, 50A) umfasst:
    einen Verbindungsmechanismus (54, 54a) zum Öffnen und Schließen des Obermessers (52, 52a) und des Untermessers (51, 51a), und
    eine Haltebasis (55, 55a), welche das Obermesser (52, 52a), das Untermesser (51, 51a) und den Verbindungsmechanismus (54, 54a) hält,
    wobei die Haltebasis (55, 55a) derart bereitgestellt ist, dass eine Position der Haltebasis (55, 55a) relativ zu einem Nähmaschinenrahmen (11) entlang einer den Bewegungspfad des Obermessers (52, 52a) schneidenden Richtung einstellbar ist.
  6. Nähmaschine (10) nach Anspruch 5, ferner umfassend:
    einen Aktuator (53, 53a), welcher als Antriebsquelle für den Verbindungsmechanismus (54, 54a) dient,
    wobei der Verbindungsmechanismus (54, 54a) ein erstes Verbindungsglied (541, 541a) zum Übertragen von Leistung des Aktuators (53, 53a) umfasst.
  7. Nähmaschine (10) nach Anspruch 6, wobei der Verbindungsmechanismus (54, 54a) ferner umfasst:
    ein zweites Verbindungsglied (545, 545a), dessen einer Endbereich mit einem Basisendbereich des Obermessers (52, 52a) drehbar verbunden ist und dessen anderer Endbereich an der Haltebasis (55, 55a) drehbar gelagert ist, und
    ein drittes Verbindungsglied (546, 546a), welches parallel zu dem zweiten Verbindungsglied (545, 545a) bereitgestellt ist und dessen einer Endbereich mit einem mittleren Bereich des Obermessers (52, 52a) drehbar verbunden ist und dessen anderer Endbereich an der Haltebasis (55, 55a) drehbar gelagert ist,
    wobei das Obermesser (52, 52a) und das Untermesser (51, 51a) über einen von dem zweiten Verbindungsglied (545, 545a), dem dritten Verbindungsglied (546, 546a), dem Obermesser (52, 52a) und der Haltebasis (55, 55a) gebildeten Pantograph-Mechanismus geöffnet und geschlossen wird.
  8. Nähmaschine (10) nach Anspruch 7, wobei der Verbindungsmechanismus (54, 54a) ferner umfasst:
    einen Fadenschneidhebel (542, 542a), dessen einer Endbereich an der Haltebasis (55, 55a) drehbar gelagert ist und dessen anderer Endbereich mit einem Schlitz ausgebildet ist, und
    ein viertes Verbindungsglied (548, 548a), dessen einer Endbereich über den Schlitz des Fadenschneidhebels (542, 542a) mit dem Untermesser (51, 51a) drehbar verbunden ist und dessen anderer Endbereich mit dem dritten Verbindungsglied (546, 546a) drehbar verbunden ist,
    wobei das Untermesser (51, 51a) und der Fadenschneidhebel (542, 542a) und auch der Pantograph-Mechanismus und der Fadenschneidhebel (542, 542a) über einen von dem Obermesser (52, 52a),
    dem vierten Verbindungsglied (548, 548a) und dem Fadenschneidhebel (542, 542a) gebildeten Winkelhebelmechanismus ineinandergreifen.
  9. Nähmaschine (10) nach Anspruch 8, wobei die Haltebasis (55, 55a) einen Wandbereich (551, 551a) zum Halten des Verbindungsmechanismus (54, 54a) und einen unteren Bereich (553, 553a), der sich in horizontaler Richtung ausgehend von einem unteren Endbereich der Haltebasis (55, 55a) erstreckt, umfasst,
    wobei der untere Bereich (553, 553a) mit einer Mehrzahl von Schlitzen (554, 554a) entlang einer den Bewegungspfad des Obermessers (52, 52a) schneidenden Richtung ausgebildet ist und wobei Führungsglieder (555, 555a) die Schlitze (554, 554a) durchgreifen, derart, dass die Fadenschneidvorrichtung (50, 50A) gleitbeweglich ist, um eine Schneidposition des Unterfadens (T2) entlang der Richtung, in der sich der Unterfaden (T2) erstreckt, einzustellen.
  10. Nähmaschine (10) nach Anspruch 8, wobei das erste Verbindungsglied (541a) die Leistung des Aktuators (53a) auf den Fadenschneidhebel (542a) überträgt, indem es dem Aktuator (53a) folgt, und wobei ein Stopper-Glied (80a) mit der Haltebasis (55a) verbunden ist, derart, dass eine Position desselben einstellbar ist, um einen Bewegungsbereich des ersten Verbindungsglieds (541a) einzustellen.
  11. Nähmaschine (10) nach Anspruch 8, wobei ein Messerposition-Einstellungsmechanismus (551a, 545c, 61a, 548a) zum Einstellen der Positionen des Untermessers (51, 51a) und des Obermessers (52, 52a) für das zweite Verbindungsglied (545, 545a) und das vierte Verbindungsglied (548, 548a) bereitgestellt ist.
EP20120168200 2011-05-18 2012-05-16 Nähmaschine Active EP2524987B1 (de)

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CN105113147B (zh) * 2015-08-18 2017-09-01 浙江中捷缝纫科技有限公司 一种缝纫机的剪线机构
CN105133214B (zh) * 2015-09-19 2017-08-25 浙江中捷缝纫科技有限公司 一种平缝机的防鸟巢结构
CN111074439A (zh) * 2018-10-19 2020-04-28 顾飞龙 缝纫机的车缝线勾切装置

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US3922983A (en) * 1974-05-09 1975-12-02 Helmut Schips Device for automatic cutting of thread in sewing machines
JPH05192481A (ja) * 1992-01-22 1993-08-03 Aisin Seiki Co Ltd ミシンの糸切り装置
JP3508371B2 (ja) * 1996-02-27 2004-03-22 ブラザー工業株式会社 鳩目穴かがりミシン
JP3779912B2 (ja) * 2001-11-19 2006-05-31 Ｊｕｋｉ株式会社 ボタン穴かがりミシン
JP3779921B2 (ja) * 2001-12-13 2006-05-31 Ｊｕｋｉ株式会社 ボタン穴かがり縫いミシン
JP4702606B2 (ja) * 2005-05-27 2011-06-15 ブラザー工業株式会社 穴かがりミシンのスロートプレート高さ調整機構
JP2007296094A (ja) * 2006-04-28 2007-11-15 Juki Corp 下糸クランプ機構
JP4940799B2 (ja) * 2006-07-12 2012-05-30 ブラザー工業株式会社 鳩目穴かがりミシンの糸切り装置
JP5042573B2 (ja) * 2006-09-15 2012-10-03 Ｊｕｋｉ株式会社 ミシン
KR101319610B1 (ko) * 2009-03-06 2013-10-23 야마토 미싱 세이조 가부시키가이샤 상자형 베드 이중환봉 재봉틀

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JP6031255B2 (ja) 2016-11-24

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