CN101831768B - Thread cutting device for sewing machine - Google Patents
Thread cutting device for sewing machine Download PDFInfo
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- CN101831768B CN101831768B CN 201010130428 CN201010130428A CN101831768B CN 101831768 B CN101831768 B CN 101831768B CN 201010130428 CN201010130428 CN 201010130428 CN 201010130428 A CN201010130428 A CN 201010130428A CN 101831768 B CN101831768 B CN 101831768B
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B65/00—Devices for severing the needle or lower thread
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Abstract
The invention relates to a thread cutting device for a sewing machine, capable of reducing fluctuation of thread apart from that to be cutted by making stabilization of the thread cutting position of a lower knife, such that appearance is attractive. The thread cutting device (20) includes an upper knife (22), a lower knife (23), an open-close link (24) coupled to the upper knife (22) and the lower knife (23), a drive source (28) coupled to the open-close link (24) to move the open-close link (24) back and forth along a linear direction. A thread is cut by closing the upper knife (22) and the lower knife (23). The thread cutting device (20) further includes a conversion link (25) having one end rotatably coupled to the open-close link (24) and the other end rotatably coupled to the lower knife (23). The conversion link (25) converts the back-and-forth movement of the open-close link (24) into a circular movement and transmits the circular movement to the lower knife (23).
Description
Technical field
The present invention relates to cut off the thread cutting device of the Sewing machines of suture or heart yearn (core rope) after making.
Background technology
For example, in thread cutting device on being arranged at round-nose button hole serging machine, as patent documentation 1 record, be provided with on tabular base station along a direction and carry out straight-line straight-line motion connecting rod, transmit connecting rod via driving on this straight-line motion connecting rod, link the cylinder apparatus as drive source.In addition, link upper cutter and lower cutter via 2 cutter connecting rods on straight-line motion connecting rod.
And, if being driven, cylinder apparatus make straight-line motion connecting rod along a direction rectilinear motion, cutter connecting rod also moves, and moves that wire clamp is entered and upper cutter and lower cutter are approached, thereby cuts off suture.
This thread cutting device is arranged near needle downing position, to carry out tangent line in the mode of the upper residual certain-length suture of cloth (sewn object).At this moment, also consistent because remain in the length of the suture on cloth if can make the position stability that cuts off suture, so outward appearance is beautiful.
Patent documentation 1: the JP 2001-232086 of Japan communique
Summary of the invention
But as shown in round-nose button hole lock seaming was made, in the situation that form the stitching that direction all around has certain width, final needle downing position was set in rectangular regional L shown in Figure 9.The longitudinal length of zone L is the adjustable range of the final needle downing position on the length direction (fore-and-aft direction) of round-nose button hole lock seaming stitching, and the lateral length of regional L is the adjustable range of the final needle downing position on the width (left and right directions) of round-nose button hole lock seaming stitching.That is, this zone L is according to when setting round-nose button hole lock seaming stitching big or small, the minimum of a value of the final needle downing position that can set on length direction and maximum, and width on the minimum of a value of the final needle downing position that can set and maximum and determine.
As shown in Figure 9, in the thread cutting device of existing Sewing machines, upper cutter 301 and lower cutter 302 are configured on base station 201, can rotate centered by the axial region of screw 316.At the fixing wired capture unit part 301A of the front end of upper cutter 301.In order to cut off the suture that is connected with sewn object, be arranged on the cutting knife 301a of section and the position (tangent position) that side edge part (cutting knife section) 302a of lower cutter 302 aligns that this line catches the side of parts 301A, be set to and be divided into centre position rear region L1 and forefoot area L2, that represented by straight line C with aforementioned areas L is roughly second-class.And in the situation that final needle downing position is positioned at rear region L1, the length that remains in the suture on sewn object after cut-out is shorter, and in addition, in the situation that final needle downing position is positioned at forefoot area L2, the length that remains in the suture on sewn object is longer.
When above-mentioned thread cutting device carried out thread cutting action, upper cutter 301 and lower cutter 302 moved in mode close to each other, but in the situation that final needle downing position is positioned at rear region L1, the cutting knife 302a of section of lower cutter 302 first engages with the suture that will cut off.Therefore, in the situation that the opening and closing speed of the lower cutter 302 that engages with suture at first is high speed, because can impact suture, so suture can be drawn out from the sewn object side, or make the tangent position on length direction with the cutting knife 302a of section of the lower cutter 302 of the cutting knife 301a of the section co-operating of upper cutter 301 unstable, thereby there is the problem of remaining line length fluctuation.
The object of the invention is to make the tangent position of cutting knife section of lower cutter stable, the fluctuation that alleviates the remaining line length that is connected with sewn object.
The invention of technical scheme 1 record is a kind of thread cutting device of Sewing machines, and it has:
Upper cutter, it can be rotatably set on base station;
Lower cutter, it can be rotatably set on aforementioned base station, with the same axle center of aforementioned upper cutter,
Open and close connecting rod, it links with aforementioned upper cutter and lower cutter, can be with respect to aforementioned base station along the rectilinear direction reciprocating motion; And
Drive source, it links with aforementioned switching connecting rod via transmitting connecting rod, makes aforementioned switching connecting rod along aforementioned rectilinear direction reciprocating motion,
Aforementioned upper cutter and lower cutter, corresponding with the reciprocating motion of aforementioned switching connecting rod and rotate, thus open and close, closed and suture is cut off by making aforementioned upper cutter and aforementioned lower cutter,
It is characterized in that,
Have the conversion connecting rod, it has rotatably an end that links with aforementioned switching connecting rod, and the other end that rotatably links with aforementioned lower cutter,
Aforementioned conversion connecting rod is transformed to rotatablely moving centered by the point of contact of an aforementioned end and aforementioned switching connecting rod with the reciprocating motion of aforementioned switching connecting rod, and will rotatablely move is passed to aforementioned lower cutter.
The invention of technical scheme 2 record is, in the Sewing machines of technical scheme 1 record, it is characterized in that,
Aforementioned transmission connecting rod is supported on aforementioned base station, can rotate centered by the 1st axle,
Aforementioned switching connecting rod has an end that links with aforementioned transmission connecting rod, and this opens and closes that connecting rod rotates centered by aforementioned the 1st axle along with aforementioned transmission connecting rod and along aforementioned rectilinear direction reciprocating motion,
Aforementioned lower cutter has an end that forms cutting knife section at a lateral margin, and is supported on aforementioned base station and the pars intermedia that can rotate centered by the 2nd axle that is parallel to aforementioned the 1st axle,
Aforementioned upper cutter has: base end part, and itself and aforementioned switching connecting rod link; Pars intermedia, it is supported on aforementioned base station, can rotate centered by aforementioned the 2nd axle; And leading section, its lateral margin form can with the cutting knife section of the cutting knife section sliding-contact of aforementioned lower cutter,
One end of aforementioned conversion connecting rod rotatably links with the pars intermedia of aforementioned switching connecting rod,
The other end of aforementioned conversion connecting rod rotatably links with the other end of aforementioned lower cutter.
Technical scheme 3 and 4 the record inventions be, technical scheme 1 or 2 the record Sewing machiness in, it is characterized in that,
Aforementioned switching link configurations is, makes the length direction of aforementioned switching connecting rod along aforementioned rectilinear direction, and this switching connecting rod has the protuberance that protrudes to the direction that intersects with aforementioned length direction,
One end of aforementioned conversion connecting rod rotatably links with aforementioned protuberance, rotates to make aforementioned conversion connecting rod along with the reciprocating motion of aforementioned switching connecting rod,
Aforementioned conversion connecting rod is connected link in the following manner with aforementioned switching connecting rod, namely, the rotation amount of the aforementioned lower cutter of the per unit amount of movement of aforementioned switching connecting rod is along with reducing near the right angle along the straight line of the length direction of conversion connecting rod and along angulation between the straight line of the length direction of aforementioned switching connecting rod.
The invention of technical scheme 5 record is, in the Sewing machines of any one record in technical scheme 1 to 4, it is characterized in that,
Point of contact between aforementioned switching connecting rod and aforementioned conversion connecting rod is set to, can be along the track of the circle centered by the point of contact between aforementioned conversion connecting rod and aforementioned lower cutter and adjust.
The invention of technical scheme 6 record is, in the Sewing machines of technical scheme 5 records, it is characterized in that,
On aforementioned switching connecting rod, along the track of circle centered by the point of contact between aforementioned conversion connecting rod and aforementioned lower cutter, a plurality of holes that are connected for aforementioned switching connecting rod and aforementioned conversion connecting rod are set.
The effect of invention
Invention according to technical scheme 1 record, can realize following structure, it links via the conversion connecting rod by opening and closing connecting rod and lower cutter, the reciprocating motion that opens and closes connecting rod is transformed to rotatablely moving of conversion connecting rod, make lower cutter carry out rotational action, lower cutter speed is reduced, thereby can make the tangent position of cutting knife section of lower cutter stable, make the residual length of the suture that is connected with sewn object or heart yearn become the length of regulation, improve marketing quality.
Invention according to technical scheme 2 records, can utilize simple structure to realize the structure that cutting knife speed is reduced, thereby can make the tangent position of cutting knife section of lower cutter stable, make the suture that is connected with sewn object or the residual length of heart yearn become specific length, the raising marketing quality.
invention according to technical scheme 3 and 4 records, can realize following structure, it is because so that the rotary speed of aforementioned lower cutter, along with the mode that reduces near the right angle along the straight line of the length direction of conversion connecting rod and straight line angulation along the vibration-direction of aforementioned switching connecting rod, link with aforementioned switching connecting rod, aforementioned conversion connecting rod rotates by the reciprocating motion of aforementioned switching connecting rod, so can be in the second half section that rotatablely moves of the lower cutter of thread cutting action, the speed of lower cutter is reduced, thereby can not increase thread cutting action speed, and make the tangent position of cutting knife section of lower cutter stable, making the suture that is connected with sewn object or the residual length of heart yearn is specific length, improve marketing quality.
According to the invention of technical scheme 5 record, because can regulate the operating space of lower cutter, thus can select best tangent position, thus the suture that is connected with sewn object or the residual length of heart yearn, raising marketing quality can be adjusted.
According to the invention of technical scheme 6 records, switching connecting rod and conversion connecting rod are linked at a plurality of diverse locations.Therefore, can select best tangent position from a plurality of tangent positions with respect to the setting regions of final needle downing position, tangential length is adjusted to the length of regulation.
Description of drawings
Fig. 1 means the oblique view of Sewing machines overview.
Fig. 2 is the exploded perspective view of the thread cutting device that relates to of an embodiment of the invention.
Fig. 3 is the top view of thread cutting device.
Fig. 4 is the bottom view of thread cutting device.
Fig. 5 is the top view of the action of explanation thread cutting device.
The top view of the thread cutting device of the state when Fig. 6 means tangent line.
Fig. 7 is the top view of the thread cutting device in situation about change opening and closing after the point of contact of connecting rod and conversion connecting rod.
The top view of the thread cutting device of the state when Fig. 8 means tangent line in situation after the point of contact that change to open and close connecting rod and conversion connecting rod.
Fig. 9 be existing thread cutting device upper lower cutter overlook key diagram.
The specific embodiment
Below, at length describe with reference to the embodiment of accompanying drawing to the thread cutting device of Sewing machines.In the present embodiment, describe as example take the thread cutting device that is arranged in round-nose button hole serging machine.
The structure of＜Sewing machines 〉
As shown in Figure 1, round-nose button hole serging machine 1 has sewing machine stand 10.Sewing machine stand 10 has: base portion 11, and it forms the case shape of essentially rectangular; Vertically body section 12, and its rear portion in this base portion 11 is upright; And arm 13, itself and base portion 11 almost parallel ground forwards extend from the top of vertical body section 12.Sewing machine stand 10 loads on sewing machine table (omitting diagram) via bottom 14.
Head (leading section) at arm 13 arranges the needle bar 16 that the bottom has suture needle 15, and it can move up and down, and can carry out the pin oscillating motion of left and right when every 1 pin.
On base portion 11, be provided be positioned at needle bar 16 under 2 looper devices (omit diagram).These two looper devices and needle bar 16 move up and down and the pin oscillating motion is synchronously moved, thereby with suture needle 15 co-operatings, form stitching loading on the sewn object above feeding platform 17.
Be provided with on base portion 11: cloth cutting knife (omitting diagram), it is positioned at the inboard (rear side) of looper device; And the hammer parts, its from the top of this cloth cutting knife with respect to the cloth cutting knife approaching/separate.Cloth-cutting apparatus and cuts out the round-nose button hole that is made of round hole part and line part by moving in the timing of regulation on sewn object.
Be provided with the feeding platform 17 of mounting sewn object at the upper surface of base portion 11.Consist of left feeding plate 18 and the right feeding plate 19 of these feeding platform 17 upper surfaces, be arranged on feeding platform 17.Left feeding plate 18 and right feeding plate 19 are centered by the straight line of the fore-and-aft direction of the upper lower railway by suture needle 15, and the left and right configures relatively.
And, it is set to, and form the Buttonhole seam on sewn object along round-nose button hole after, feeding platform 17 returns to origin position, round-nose button hole on the surperficial thereon sewn object of mounting forms the up and down of position, makes the cloth cutting knife relative with the hammer parts.At this position (cloth cut off device), the hammer parts descend and form joint-cutting along round-nose button hole lock seaming stitching.
Be provided with thread cutting device 20 on the right feeding plate 19 of feeding platform 17.Thread cutting device 20 is after the lock seaming sewing finishing, and the end of the stitching that will form from the round-nose button hole along sewn object extends to the suture of needle plate (omitting diagram) and cuts off from the heart yearn that the stitching end extends.Thread cutting device 20 can be also the structure that is arranged on left feeding plate 18.
The structure of＜thread cutting device 〉
As shown in Figure 2 and Figure 3, thread cutting device 20 has base station 21, upper cutter 22 and lower cutter 23, switching connecting rod 24, conversion connecting rod 25, drives and transmit connecting rod 27 and drive source 28.
The pars intermedia of upper cutter 22 rotatably is supported on the face side (upper surface side) of base station 21 by connecting pin 22a.A lateral margin in an end of upper cutter 22 (leading section) forms by sharp-pointed processing to be used for cutting off the cutting knife 22b of section of suture.The other end of upper cutter 22 (base end part) rotatably links with switching connecting rod 24 by connecting pin 22c.
One end of lower cutter 23 forms rectangle, a lateral margin (cutting knife section) 23b on its rotation direction can with the cutting knife 22b of the section sliding-contact of upper cutter 22.By making the cutting knife 22b of section and the cutting knife 23b of section sliding-contact, can cut off suture.The linking part 23a (the other end) of lower cutter 23 rotatably links with conversion connecting rod 25 by connecting pin 26.
Opening and closing connecting rod 24 is set to be housed in the recess 21a that is formed on base station 21.Recess 21a forms along the length direction of base station 21 and extends.Opening and closing connecting rod 24 is to form the sheet material of strip shape along a direction along recess 21a, can be along the reciprocating motion in recess 21a of its length direction.
An end that opens and closes connecting rod 24 links with the base end part of upper cutter 22 by connecting pin 22c.The other end that opens and closes connecting rod 24 links with an end that drives transmission connecting rod 27 by connecting pin 24a.In the other end that opens and closes connecting rod 24, be formed for along its length inserting a plurality of (being in the present embodiment 3) connect apertures 24b of connecting pin 24a, can change it and to drive the coupling position that transmits connecting rod 27.Transmit connecting rod 27 in certain connect apertures 24b place's link by making to open and close connecting rod 24 and drive, can change the initial position on the length direction that opens and closes connecting rod 24.
Because by opening and closing connecting rod 24, upper cutter 22, drive and transmit connecting rod 27 and consist of four sections linkages, so open and close connecting rod 24 can move back and forth along the length direction of the recess 21a of base station 21 (roughly rectilinear motion).
Middle part at the length direction that opens and closes connecting rod 24 forms protuberance 30, and it is to extend to the mode of protruding with the direction of length direction quadrature.
On protuberance 30, form to insert be used for a plurality of (being in the present embodiment 2) connect apertures 30a, 30b of the connecting pin 25a that links with conversion connecting rod 25. Connect apertures 30a, 30b form along the track of the circle centered by connecting pin 26, and aforementioned connecting pin 26 links linking part 23a and the conversion connecting rod 25 of lower cutters 23.Utilize upper cutter 22 and lower cutter 23 to cut off the position of sutures by making conversion connecting rod 25 and protuberance 30 in certain connect apertures 30a, 30b place's link, can changing.
In Fig. 1 to Fig. 4, conversion connecting rod 25 and protuberance 30 are linked by connect apertures 30a.
On protuberance 30, as mentioned above, rotatably link conversion connecting rod 25 via connecting pin 25a.
As conversion connecting rod 25, the one end links at the upper surface of protuberance 30, and the other end rotatably links with the linking part 23a of lower cutter 23 by connecting pin 26.Thus, if 25 rotations of conversion connecting rod, lower cutter 23 also rotates centered by connecting pin 22a.
The linking part 23a of the other end of conversion connecting rod 25 and lower cutter 23 links, thus an end of the conversion connecting rod 25 that links with protuberance 30 compare, from the pivot of lower cutter 23 be connecting pin 22a away from.At this moment, lower cutter 23 becomes the state that separates with upper cutter 22 and separate.And, rotate centered by connecting pin 25a by making conversion connecting rod 25, the other end of conversion connecting rod 25 is with to upper cutter 22 side shiftings, thereby so that lower cutter 23 move with the mode that upper cutter 22 approaches.
Driving an end that transmits connecting rod 27 rotatably links with switching connecting rod 24 by connecting pin 24a.
As shown in Figure 4, drive the other end of transmission connecting rod 27 in the rear side (lower face side) of base station 21, link with the 1st intermediate connecting rod 31 via connecting pin 27a (the 1st axle), thereby rotatably be supported on base station 21.The 1st intermediate connecting rod 31 rotatably links with the 2nd intermediate connecting rod 2 via connecting pin 31a, and the 2nd intermediate connecting rod 32 rotatably links with rotation connecting rod 33 via connecting pin 32a.Rotation connecting rod 33 can be supported on base station 21 centered by axial region 33a rotatably at the middle part of length direction.
One end of rotation connecting rod 33 and the 2nd intermediate connecting rod 32 link.At the other end of rotation connecting rod 33, be provided with the pin 33b that protrudes towards the below.Pin 33b embeds in the pin driver part 29 that arranges thereunder.Pin driver part 29 links with the drive source 28 that is fixed on feeding platform 17.Drive source 28 is for example cylinder 28, and pin driver part 29 links with the plunger rod 28a of cylinder 28.Cylinder 28 is connected with the control device (omitting diagram) of Sewing machines, utilizes control device to control and drives.
If the plunger rod 28a of cylinder 28 is mobile to the direction of stretching out (the D1 direction in Fig. 4), the wall 29a of section and pin 33b butt, the 29a of section presses pad 33b by wall, can make to rotate connecting rod 33 to the D2 direction rotation of Fig. 4.On the other hand, if the plunger rod 28a of cylinder 28 is mobile to the direction of keeping out of the way (with the direction of D1 opposite direction in Fig. 4), the wall 29b of section and pin 33b butt, the 29b of section presses pad 33b by wall, can make rotation connecting rod 33 to the direction rotation opposite with D2 in Fig. 4.
By adopting this structure, as long as carry out operation that base station 21 is pulled down from feeding platform 17, just thread cutting device 20 can be pulled down from feeding platform 17.
＜thread cutting action 〉
Fig. 3 means the figure of the state of the thread cutting device 20 before tangent line.When carrying out tangent line, if from state shown in Figure 3, cylinder 28 is driven, as shown in Figure 4, plunger rod 28a is moved to D 1 direction, rotate connecting rod 33 centered by axial region 33a to the D2 direction rotation.If rotation connecting rod 33 is to the D2 direction rotation, the 2nd intermediate connecting rod 32 moves to the D3 direction, and the 1st intermediate connecting rod 31 rotates to D4 direction (counter clockwise direction in Fig. 4) centered by connecting pin 27a.
If the 1st intermediate connecting rod 31 to the D4 direction rotation, as shown in Figure 5, drives transmission connecting rod 27 and rotates to D5 direction (clockwise direction in Fig. 5) centered by connecting pin 27a.Transmit connecting rod 27 to the D5 direction rotation if drive, open and close the driven transmission connecting rod 27 of connecting rod 24 and draw and carry out roughly traveling priority to the D6 direction.Move to the D6 direction if open and close connecting rod 24, upper cutter 22 rotates to D7 direction (clockwise direction in Fig. 5) centered by connecting pin 22a (the 2nd axle parallel with the 1st axle).Thus, the cutting knife 22b of section of upper cutter 22 moves to the D8 direction, to approach to lower cutter 23.
On the other hand, move to the D6 direction if open and close connecting rod 24, by connecting pin 25a and the conversion connecting rod 25 that the protuberance 30 that opens and closes connecting rod 24 links, rotate to D9 direction (counter clockwise direction in Fig. 5) centered by connecting pin 25a.By making conversion connecting rod 25 to the D9 direction rotation, the lower cutter 23 that links with conversion connecting rod 25 rotates to D10 direction (counter clockwise direction in Fig. 5) centered by connecting pin 22a (the 2nd axle).Thus, the cutting knife 23b of section of lower cutter 23 moves in the mode that the cutting knife 22b of section to upper cutter 22 approaches.
at this moment, with the horizontal linear X of the left and right directions of the pivot that passes connecting pin 25a as benchmark, the length direction of conversion connecting rod 25 and this horizontal linear X angulation, namely pass the straight line W (W1 of the pivot of the pivot of connecting pin 25a and connecting pin 26, W2, W3) angle of present position, from full-gear shown in Figure 3 (θ 1), along with becoming mobile status (Fig. 5, θ 2), and on cut 22 and the cutting knife 22b of section of lower cutter 23,23b alignment and position D (Fig. 6 that suture is cut off, tangent position, θ 3), and reduce gradually.
Therefore, move to the D6 direction with certain speed in the situation that open and close connecting rod 24, open and close the rotation amount of the incision 23 of connecting rod 24 per unit amount of movements, along with horizontal linear X reduce with straight line W angulation along the length direction of conversion connecting rod 25 (in other words, along with along the straight line W of the length direction of conversion connecting rod 25 with along the straight line angulation of the length direction that opens and closes connecting rod 24 near the right angle) and reduce.That is, cut 22 and incision 23 when rotating to tangent position from original state (state that separates) upper, upper cutter 22 is with the certain speed rotation, and on the other hand, lower cutter 23 slows down gradually.
Then, as shown in Figure 6, upper cutter 22 and lower cutter 23 sliding-contacts, thus overlapping up and down at tangent position (position of straight line D shown in Figure 3), by making two cutting knifes 22,23, suture being sandwiched, two the cutting knife 22b of section, 23b can cut off suture.
As mentioned above, because along with the rotation of lower cutter 23 to tangent position, the speed of lower cutter 23 reduces, so the speed of the lower cutter 23 in the time of can suppressing tangent line.Therefore, can make the tangent position at the cutting knife 23b of section place of incision 23 stable, thus the fluctuation that alleviates remaining line length.
The actuating quantity of＜adjusting lower cutter 〉
Below, with reference to Fig. 7, Fig. 8, the situation of regulating tangent position for the actuating quantity of regulating lower cutter 23 describes.
The point of contact that Fig. 7 represents to open and close connecting rod 24 and conversion connecting rod 25 changes to connect apertures 30b from connect apertures 30a, tangent position is changed to the state of dotted line B position from straight line D position.
Namely, if connecting pin 25a is extracted and inserts connect apertures 30b from connect apertures 30a, pass connecting pin 25a the center horizontal linear X and along the angle of the original state between the straight line W of the length direction of conversion connecting rod 25, be decreased to angle θ shown in Figure 74 from angle θ shown in Figure 31.And, forwards moving along with opening and closing connecting rod 24, the length direction of conversion connecting rod 25 is with respect to horizontal linear X, from the direction of angle θ 4, is changed to roughly consistent direction of shown in Figure 8 and horizontal linear X.Therefore, because the rotation amount of the lower cutter 23 from initial position to tangent position reduces, so the tangent position that the cutting knife 23b of section of incision 23 engages with the cutting knife 22b of section of upper cutter 22 changes to the dotted line B position at rear, straight line D position.
Tangent position is the situation of dotted line B position, compares with the situation that tangent position is straight line D position, can shorten the length of the cut-out end of the suture that remains on sewn object.
In the situation that regional A shown in Figure 7 and regional L shown in Figure 9 are suitable, for example, straight line D is corresponding with straight line C, and straight line B becomes the position in rear region L1.
In the above-described embodiment, by 2 connect apertures 30a, 30b are set, can select tangent position from 2 positions, but three connect apertures also can be set, select arbitrarily tangent position the position in the position consistent with center line C shown in Figure 9, rear region L 1, these 3 positions, position in forefoot area L2.
Thus, can select best tangent position from a plurality of tangent positions with respect to the setting regions of final needle downing position, thereby tangential length is adjusted to the length of regulation.
As mentioned above, utilize the thread cutting device 20 of Sewing machines, open and close connecting rod 24 and lower cutters 23 by linking via conversion connecting rod 25, and the reciprocating motion that will open and close connecting rod 24 is transformed to rotatablely moving of conversion connecting rod 25.
Thus, and the rotation amount of the lower cutter 23 that links of conversion connecting rod 25 and only and open and close between the rotation amount of the upper cutter 22 that connecting rod 24 links and form residual quantity.And along with the straight line W along the length direction of conversion connecting rod 25 approaches rotation to horizontal linear X, the rotary speed of lower cutter 23 reduces gradually.That is, in the situation that conversion connecting rod 25 rotates Δ θ from original state to counter clockwise direction with certain speed, the rotation amount of lower cutter 23 is directly proportional to the displacement cos Δ θ along the horizontal linear directions X of conversion connecting rod 25.
As mentioned above, by the point of contact of connecting rod 24 and conversion connecting rod 25 can be selected to open and close from a plurality of diverse locations, can regulate tangent position.
And, illustrated and be provided with the example that a plurality of insertions make the connect apertures of the connecting pin 25a that opens and closes connecting rod 24 and 25 links of conversion connecting rod, but the connect apertures of a circular-arc or elongate for example can only be set also, connecting pin 25a can be moved to the optional position in this connect apertures, and adjust the fixed position of the connecting pin 25a in connect apertures.
Claims (6)
1. the thread cutting device of a Sewing machines, it has:
Upper cutter, it can be rotatably set on base station;
Lower cutter, it can be rotatably set on aforementioned base station, with the same axle center of aforementioned upper cutter,
Open and close connecting rod, it links with aforementioned upper cutter and lower cutter, can be with respect to aforementioned base station along the rectilinear direction reciprocating motion; And
Drive source, it links with aforementioned switching connecting rod via transmitting connecting rod, makes aforementioned switching connecting rod along aforementioned rectilinear direction reciprocating motion,
Aforementioned upper cutter and lower cutter, corresponding with the reciprocating motion of aforementioned switching connecting rod and rotate, thus open and close, closed and suture is cut off by making aforementioned upper cutter and aforementioned lower cutter,
It is characterized in that,
Have the conversion connecting rod, it has rotatably an end that links with aforementioned switching connecting rod, and the other end that rotatably links with aforementioned lower cutter,
Aforementioned conversion connecting rod is transformed to rotatablely moving centered by the point of contact of an aforementioned end and aforementioned switching connecting rod with the reciprocating motion of aforementioned switching connecting rod, and will rotatablely move is passed to aforementioned lower cutter.
2. the thread cutting device of Sewing machines as claimed in claim 1, is characterized in that,
Aforementioned transmission connecting rod is supported on aforementioned base station, can rotate centered by the 1st axle,
Aforementioned switching connecting rod has an end that links with aforementioned transmission connecting rod, and this opens and closes that connecting rod rotates centered by aforementioned the 1st axle along with aforementioned transmission connecting rod and along aforementioned rectilinear direction reciprocating motion,
Aforementioned lower cutter has an end that forms cutting knife section at a lateral margin, and is supported on aforementioned base station and the pars intermedia that can rotate centered by the 2nd axle that is parallel to aforementioned the 1st axle,
Aforementioned upper cutter has: base end part, and itself and aforementioned switching connecting rod link; Pars intermedia, it is supported on aforementioned base station, can rotate centered by aforementioned the 2nd axle; And leading section, its lateral margin form can with the cutting knife section of the cutting knife section sliding-contact of aforementioned lower cutter,
One end of aforementioned conversion connecting rod rotatably links with the pars intermedia of aforementioned switching connecting rod,
The other end of aforementioned conversion connecting rod rotatably links with the other end of aforementioned lower cutter.
3. the thread cutting device of Sewing machines as claimed in claim 1, is characterized in that,
Aforementioned switching link configurations is, makes the length direction of aforementioned switching connecting rod along aforementioned rectilinear direction, and this switching connecting rod has the protuberance that protrudes to the direction that intersects with aforementioned length direction,
One end of aforementioned conversion connecting rod rotatably links with aforementioned protuberance, rotates to make aforementioned conversion connecting rod along with the reciprocating motion of aforementioned switching connecting rod,
Aforementioned conversion connecting rod and aforementioned switching connecting rod link in the following manner, namely, the rotation amount of the aforementioned lower cutter of the per unit amount of movement of aforementioned switching connecting rod is along with reducing near the right angle along the straight line of the length direction of conversion connecting rod and along angulation between the straight line of the length direction of aforementioned switching connecting rod.
4. the thread cutting device of Sewing machines as claimed in claim 2, is characterized in that,
Aforementioned switching link configurations is, makes the length direction of aforementioned switching connecting rod along aforementioned rectilinear direction, and this switching connecting rod has the protuberance that protrudes to the direction that intersects with aforementioned length direction,
One end of aforementioned conversion connecting rod rotatably links with aforementioned protuberance, rotates to make aforementioned conversion connecting rod along with the reciprocating motion of aforementioned switching connecting rod,
Aforementioned conversion connecting rod and aforementioned switching connecting rod link in the following manner, namely, the rotation amount of the aforementioned lower cutter of the per unit amount of movement of aforementioned switching connecting rod is along with reducing near the right angle along the straight line of the length direction of conversion connecting rod and along angulation between the straight line of the length direction of aforementioned switching connecting rod.
5. as the thread cutting device of the described Sewing machines of any one in claim 1 to 4, it is characterized in that,
Point of contact between aforementioned switching connecting rod and aforementioned conversion connecting rod is set to, can be along the track of the circle centered by the point of contact between aforementioned conversion connecting rod and aforementioned lower cutter and adjust.
6. the thread cutting device of Sewing machines as claimed in claim 5, is characterized in that,
On aforementioned switching connecting rod, along the track of circle centered by the point of contact between aforementioned conversion connecting rod and aforementioned lower cutter, a plurality of holes that are connected for aforementioned switching connecting rod and aforementioned conversion connecting rod are set.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009061059A JP2010213767A (en) | 2009-03-13 | 2009-03-13 | Thread-cutting device of sewing machine |
| JP2009-061059 | 2009-03-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101831768A CN101831768A (en) | 2010-09-15 |
| CN101831768B true CN101831768B (en) | 2013-06-12 |
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| CN 201010130428 Active CN101831768B (en) | 2009-03-13 | 2010-03-12 | Thread cutting device for sewing machine |
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| EP (1) | EP2228477B1 (en) |
| JP (1) | JP2010213767A (en) |
| CN (1) | CN101831768B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2018000522A (en) * | 2016-06-30 | 2018-01-11 | ブラザー工業株式会社 | Thread cutting mechanism and sewing apparatus |
| CN106120194B (en) * | 2016-08-10 | 2019-08-23 | 湖州冠炯机电科技有限公司 | The method of rope embroidery machine automatic shearing |
| CN106120196B (en) * | 2016-08-10 | 2019-11-22 | 湖州冠炯机电科技有限公司 | Embroidery machine automatic shearing rope device |
| CN106120197B (en) * | 2016-08-10 | 2019-10-25 | 湖州冠炯机电科技有限公司 | Cut rope device |
| CN111020903B (en) * | 2019-12-17 | 2021-08-24 | 杰克缝纫机股份有限公司 | Seam-making thread trimming mechanism and method thereof |
| CN112064221B (en) * | 2020-09-30 | 2021-10-15 | 拓卡奔马机电科技有限公司 | Thread cutting system of sewing machine and sewing method |
| US11879195B2 (en) * | 2022-03-02 | 2024-01-23 | Hongcheng Precision Industry CO., Ltd. | Automatic thread trimming device of sewing machine |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1357661A (en) * | 2000-12-07 | 2002-07-10 | 重机公司 | Tread cutter |
| CN101144230A (en) * | 2006-09-15 | 2008-03-19 | Juki株式会社 | Sewing machine |
| CN101270538A (en) * | 2007-03-22 | 2008-09-24 | 兄弟工业株式会社 | Wire cutting device of sewing machine |
| CN201125312Y (en) * | 2008-05-28 | 2008-10-01 | 阮孟定 | Numerical control automatic double sule cutting cup seaming machine |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL267472A (en) * | 1960-09-22 | 1900-01-01 | ||
| JPS62129093A (en) * | 1985-11-29 | 1987-06-11 | ジューキ株式会社 | Yarn cutter of sewing machine |
| JP3426709B2 (en) * | 1994-05-30 | 2003-07-14 | ブラザー工業株式会社 | Eyelet overhole sewing machine thread trimming device |
| JP4686025B2 (en) * | 1999-12-16 | 2011-05-18 | Ｊｕｋｉ株式会社 | Sewing machine thread trimmer |
| JP4468550B2 (en) * | 2000-05-16 | 2010-05-26 | Ｊｕｋｉ株式会社 | Thread trimming device for eyelet sewing machine |
-
2009
- 2009-03-13 JP JP2009061059A patent/JP2010213767A/en active Pending
-
2010
- 2010-03-12 EP EP10156348.4A patent/EP2228477B1/en active Active
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1357661A (en) * | 2000-12-07 | 2002-07-10 | 重机公司 | Tread cutter |
| CN101144230A (en) * | 2006-09-15 | 2008-03-19 | Juki株式会社 | Sewing machine |
| CN101270538A (en) * | 2007-03-22 | 2008-09-24 | 兄弟工业株式会社 | Wire cutting device of sewing machine |
| CN201125312Y (en) * | 2008-05-28 | 2008-10-01 | 阮孟定 | Numerical control automatic double sule cutting cup seaming machine |
Non-Patent Citations (2)
| Title |
|---|
| JP昭62-129093A 1987.06.11 |
| JP特开2001-321589A 2001.11.20 |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2228477A2 (en) | 2010-09-15 |
| EP2228477B1 (en) | 2016-03-02 |
| CN101831768A (en) | 2010-09-15 |
| JP2010213767A (en) | 2010-09-30 |
| EP2228477A3 (en) | 2015-03-11 |
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