CN2317238Y - Thread-severing device for sewing machine - Google Patents
Thread-severing device for sewing machine Download PDFInfo
- Publication number
- CN2317238Y CN2317238Y CN 97204668 CN97204668U CN2317238Y CN 2317238 Y CN2317238 Y CN 2317238Y CN 97204668 CN97204668 CN 97204668 CN 97204668 U CN97204668 U CN 97204668U CN 2317238 Y CN2317238 Y CN 2317238Y
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- trimming
- cam
- thread
- action
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Abstract
The utility model relates to a thread-severing device for a sewing machine. The utility model can sever threads accurately and excellently in the state of high-speed tailoring, for the thread-severing device is provided with a thread-severing cam 1 which rotates correspondingly to the rotation of a main shaft, and linking members 24, 23, 25, 26, 27, 28, 31 of the main shaft are used for ensuring the thread-severing operation and plate-releasing operation to synchronize with the main shaft; thus, the utility model can realize consecutive thread-severing operation according to the strict linked relation.
Description
The utility model is with relevant according to the Sewing machines cutting facility that carries out the trimming action from the trimming action message of trimming cam.
In the prior art, the trimming of Sewing machines action utilizes the trimming cam that rotates along with main shaft that the trimming cutting knife is moved to realize.Promptly, when carrying out trimming, the connecting rod input part of trimming linkage is pressed against on the cam surface of trimming cam, to pass to movable cutting knife from the trimming action message of above-mentioned trimming cam by linkage, movable cutting knife is rotated, will cut off at the line between this movable cutting knife and the fixed cutting tool.
When carrying out trimming as described above action, utilize loose disc mechanism to loosen the clamp power of clamp dish, the tension force by reducing line, make trimming action failsafe, this technology is in the past known.Loose disc mechanism as realization disc separating action as described above discloses various structures in the prior art.
But existing loose disc mechanism owing to do not have tight synchronized relation with thread cutting mechanism, particularly during high-speed sewing, can produce the problem of poor stitching quality when making again behind the bad and trimming of trimming.
Therefore, the purpose of this utility model is, the problem of above-mentioned existence during pin provides a kind of and can carry out good trimming action when high-speed sewing, and the Sewing machines cutting facility that can make with good state behind trimming.
In order to realize above-mentioned purpose, the utility model provides a kind of cutting facility of Sewing machines, comprise: a thread cutting mechanism, this thread cutting mechanism has and is fixed on the main shaft trimming cam that rotates with integrated spindle axis, with the grooved cam that is wearing on the axial rearward end side end face of trimming cam, this grooved cam forms the trimming action message that makes the trimming cutting knife carry out the trimming action; Carry out the loose disc mechanism of trimming action the time the loosening clamp pressure of tension disk with one at described trimming cutting knife; It is characterized in that the cutting facility of described Sewing machines is provided with: with the pine dish recess of trimming cam unitary rotation; With will pass to the linkage of tension disk side from the loose ends action message of this pine dish recess.
In the cutting facility of Sewing machines of the present utility model, because the corresponding trimming cam that rotates with integrated spindle axis, make thread cutting mechanism and loose disc mechanism realize synchronization action by the main shaft interlinked mechanism, continuous trimming action is carried out according to tight synchronized relation, so just guaranteed when high-speed sewing, can advance the high good trimming action of precision.
Fig. 1 is the three-dimensional exploded view of structure of cutting facility of the Sewing machines of an expression embodiment of the present utility model;
The main amplification stereogram partly of Fig. 2 pine disc mechanism;
Fig. 3 shows the programme diagram of making the basic order of action of the present utility model;
Fig. 4 is the figure of the action of expression trimming pine disc mechanism.
Below, be described with reference to the accompanying drawings embodiment of the present utility model.
In Fig. 1, arrow A is opposite with the arrow B direction, arrow A, B are vertical mutually with the direction of arrow C, D indication with arrow D direction is opposite for arrow C.In the represented example of Fig. 1, the trimming cam 1 that constitutes thread cutting mechanism be fixing in the drawings not the Sewing machines master of expression on axis direction rear end side (arrow B direction) end face of trimming cam 1, wearing the grooved cam (not shown) of ring-type by on (go up by).Form the information that makes its trimming of stipulating action of corresponding trimming cutting knife described later by this grooved cam.
With the shear spool 2 and main shaft almost parallel of above-mentioned machine spindle in abutting connection with configuration, on the axis direction of arrow A (B) direction, moving back and forth, and can be that the mode that rotate at the center is bearing on the frame with the axis, the hub portion 3a of cardinal extremity one side of cam follower arm 3 (arrow D direction) is fixed on this shear spool 2.That is, this cam follower arm 3 can move back and forth along axis direction with above-mentioned shear spool 2, also can rotate with above-mentioned shear spool 2, and cross from hub portion 3a main shaft the top approximate horizontal extend out.Described as the back, cam follower arm 3 is that trimming is carried out the position towards the position that cardinal extremity one side (arrow A direction) is advanced near trimming cam 1 ground, is to wait for the trimming position and deviate from the position that base end side (arrow B direction) retreats.
In addition, in the end towards the arrow A direction of shear spool 2 the trimming return spring 4 that is in compressive state is installed also, because the elastic force effect of this trimming return spring 4, cam follower arm 3 is pushed to the arrow B direction with shear spool 2.
On the other hand, the trimming roller bearing 5 substantially parallel with main shaft is installed, is installed with simultaneously and can rolls 6 with respect to the trimming that this trimming roller bearing 5 freely rotates in the middle part of stretching out direction of above-mentioned cam follower arm 3.This trimming rolls 6 and should be abutted against with the cam surface of above-mentioned trimming cam 1, but usually because the elastic force effect of above-mentioned trimming return spring 4, it along with cam follower arm 3 rearward (B direction) retreat, leave the cam surface of trimming cam 1 along axis direction, in the contactless state off working state) wait for trimming.
Above above-mentioned cam follower arm 3, the driven check plate 7 of cam by approximate horizontal be fixed on the sewing machine frame (not shown).Front edge portion at the driven check plate 7 of this cam is provided with along the stop protuberance 7a of the outstanding scheduled volume of major axes orientation, and the protuberance 3b that is abutted against that is arranged on the base end side of cam follower arm 3 makes and can be abutted against from the place ahead of major axes orientation and the stop tab 7a of the driven check plate 7 of this cam.
Exactly, advance to trimming at cam follower arm 3 to cardinal extremity one side and carry out position quantity, the stop protuberance 7a that is abutted against protuberance 3b and the driven check plate 7 of cam of driven 3 arms of this cam is abutted against, and is in trimming and carries out state, and promptly trimming rolls 6 and keeps the state that is abutted against with the cam surface of trimming cam 1.And in the trimming release, when cam follower arm 3 is rotated, this cam follower arm 3 be abutted against the stop tab 7a that protuberance 3b leaves the driven check plate 7 of cam, and cam follower arm 3 retreats into off-position towards the direction opposite with base end side under the elastic force effect of above-mentioned trimming return spring 4.
On the driven check plate 7 of above-mentioned cam, supporting with ladder bolt 33 can vertical axis be the middle part of the trimming magnetic head arm 8 that freely rotates of center.This trimming magnetic head arm 8 is configured to cross the top of main shaft, and forms hook portion 8a in a side at the tip of trimming magnetic head arm 8, and this hook portion 8a leans against being abutted against on the protuberance 3b of above-mentioned cam follower arm 3 from a side opposite with base end side along major axes orientation.
Side in the arrow B direction of the cardinal extremity of above-mentioned trimming magnetic head arm 8, trimming solenoid coil 11 is fixed on the sewing machine frame with erection support 9, and the output shaft 11a of this trimming solenoid coil 11 is being connected with the end 8b of above-mentioned trimming magnetic head arm 8 free to rotately.And, when this trimming solenoid coil 11 is switched on, when output shaft 11a was attracted back, above-mentioned trimming magnetic head arm 8 was that rotate at the center with ladder bolt 33 just, and the protuberance 3b that is abutted against of above-mentioned cam follower arm 3 is pushed to the arrow A direction by the hook portion 8a of this trimming magnetic head arm 8.
And locate in the end towards the arrow C direction of above-mentioned cam follower arm 3, supporting along the upper part of the trimming connecting rod 12 of vertical extension free to rotately.The end portion of this trimming connecting rod 12 is connected with the rearward end that slightly is horizontally extending trimming connecting rod 14 by the connecting rod 13 of L font free to rotately, along with swinging up and down of above-mentioned cam follower arm 3, make trimming connecting rod 14 along the ground reciprocating motion of axis direction approximate horizontal.At this moment, the trimming rod spring 15 that is extended state is installed in the middle part of above-mentioned trimming connecting rod 14, because the tensile-elasticity effect of this trimming rod spring 15, above-mentioned trimming connecting rod 14 is pulled to L font connecting rod 13 here.
In addition, normal pin 17 is connected on the leading section of above-mentioned trimming connecting rod 14 (towards the end of arrow A direction) free to rotately, constitute the input part of cutter connecting rod mechanism, and this cutter connecting rod mechanism is used to make cutting knife 16 to rotate, when above-mentioned trimming connecting rod 14 moves horizontally and when cutting knife 16 was rotated, line was cut off between this moving cutting knife 16 and fixed cutting tool 18.
The loose ends notch plate 21 that the long arc plate of about quarter turn constitutes is installed on the axial forward end face (end face of arrow A direction) of above-mentioned trimming cam 1.This loose ends notch plate 21 constitutes the line loosening up that clamp dish 22 described later is stipulated, is the part of loose disc mechanism, and the outer peripheral face of this loose ends notch plate 21 is configured at radial direction more protruding than the outer peripheral face of above-mentioned trimming cam 1.
Above-mentioned shear spool 2 is supporting the central part of roughly L-shaped thread tension releasing disc 23, and this thread tension releasing disc 23 is in abutting connection with the hub portion 3a of cam follower arm 3, and is free to rotate, but can not move along axis direction.Therefore, thread tension releasing disc 23 can only move along axis direction with shear spool 2.This thread tension releasing disc 23 has horizontal arm 23a that extends and the upright arm 23b that extends downwards above main shaft, at the front end position of horizontal arm 23a, (arrow A direction) fixing loose ends arm pin 24 highlightedly towards axis direction the place ahead.
Loose ends arm pin 24 is normally isolated with axle and relatively is configured on the radiation direction than on the more outer position of the outer coplanar of loose ends notch plate 21 with the direction of arrow B, when thread tension releasing disc 23 along with cam follower arm 3 when trimming cam 1 side (arrow A direction) is mobile, above-mentioned loose ends arm pin 24 can move on on the outer peripheral face of loose ends notch plate 21 and realize being abutted against.
The cardinal extremity (end of arrow B direction) that is also disposing L font connecting rod 25, L font connecting rod 25 below thread tension releasing disc 23 can be that the center is bearing on the frame rotationally with vertical commentaries on classics line, and the outside portion of this L font connecting rod 25 is connected with the lower end of the upright arm 23b of thread tension releasing disc 23 is inboard usually.Connecting at the other end of L font connecting rod 25 can vertical axis be an end of the loose ends connecting rod 26 that freely rotates of center.Promptly, when loose ends notch plate 21 rotates with trimming cam 1, the loose ends arm pin 24 that abuts against on the loose ends notch plate 21 makes thread tension releasing disc 23 rotate around shear spool 2, simultaneously this thread tension releasing disc 23 with shear spool 2 to trimming cam 1 side shifting, like this, the lower end of thread tension releasing disc 23 just connects 25 the outside portion away from cardinal extremity with the L font and is connected, and at this moment, is that rotate at the center owing to the rotation of thread tension releasing disc 23 makes L font connecting rod 25 with the cardinal extremity.The rotation of L font connecting rod 25 makes loose ends connecting rod 26 along continuous straight runs (arrow A, B direction) reciprocating motion again.
The other end of above-mentioned loose ends connecting rod 26 is connected with an end of clamp connecting rod 28 by connecting adjustment part 27, and this clamp connecting rod 28 is along with moving horizontally of above-mentioned loose ends connecting rod 26 moves back and forth.This clamp connecting rod 28 is processed to tortuous in the horizontal direction shape, and its part (side of arrow A direction) near front end can supported by supporting plate 29 with being free to slide.
Above-mentioned tension disk 32, well-known, be that the pressure with regulation is held in wire clamp between a pair of clamp dish 22, therefore, when above-mentioned loose ends pin 31 during to tension disk 32 side shiftings, the clamp power of the clamp dish 22 of this tension disk 32 is just loosened.
In the such loose disc mechanism of present embodiment, be provided with the main shaft interlinked mechanism that carries out disc separating action according to the action of trimming cam 1, the same with thread cutting mechanism, realize synchronized relation with main shaft by the main shaft interlinked mechanism.
The following describes the thread cutting method that adopts this cutting facility.
When making release, when sending the signal of trimming, connect trimming solenoid coil 11 according to this trimming signal by control device for sewing-machine.At this moment, like that, trimming magnetic head arm 8 rotates, and makes shear spool 2 and cam follower arm 3 overcome the elastic force of trimming spring 4 shown in Fig. 4 (1), (2), forwards (arrow A direction) moves, and is arranged on trimming on the cam follower arm 3 and rolls 6 and be abutted against with the cam surface of trimming cam 1.Like this, make the knee-action of cam follower arm 3 conversion self from the trimming action message of the trimming cam 1 that rotates with main shaft, then, such knee-action is by trimming connecting rod 12, L font connecting rod 13 and trimming connecting rod 14, as horizontally rotating the input part 17 of transmission of power to cutter connecting rod mechanism.Cutting knife 16 is rotated, thereby will cut off at the line between this moving cutting knife 16 and the fixed cutting tool 18.
When carrying out such trimming action, shown in Fig. 4 (3); The stop protuberance 7a that is abutted against protuberance 3b and the driven check plate 7 of cam of cam follower arm 3 is abutted against, and therefore, cam follower arm 3 is maintained at the trimming of front side and carries out the position.After trimming solenoid coil 11 and power supply disconnected, up to the trimming release, trimming rolls 6 to be continued to be abutted against with the cam surface of trimming cam 1.
On the other hand, the trimming magnetic head arm 8 that is caused by above-mentioned trimming solenoid coil 11 energisings moves, push cam follower arm 3 and thread tension releasing disc 23 to the place ahead (arrow A direction) together, the loose ends arm pin 24 that is arranged on the thread tension releasing disc 23 can be abutted against on the outer peripheral face of loose ends notch plate 21.
And before above-mentioned moving cutting knife 16 carried out the trimming action, the outer coplanar of above-mentioned loose ends arm pin 24 and loose ends notch plate 21 entered and is abutted against state, thereby thread tension releasing disc 23 is rotated in vertical plane.The rotational action of this thread tension releasing disc 23 passes to clamp connecting rod 28 by L font connecting rod 25, loose ends connecting rod 26 as diagram pulling force inwards.As a result, the step element 28a that is arranged on the front part of above-mentioned clamp connecting rod 28 releases loose ends pin 31, because this loose ends pin 31 is pushed out along the dish direction of principal axis towards tension disk 32, thereby the clamp pressure that the clamp dish 22 by clamp road 32 is formed is loosened.That is, this loose ends action is to carry out synchronously and in the correct time with above-mentioned trimming action.
Like this, in the cutting facility and method of the Sewing machines of present embodiment, because trimming cam 1 and the thread cutting mechanism and the mechanism that sells at reduced prices that rotate by main shaft interlinked mechanism and integrated spindle axis have realized correct synchronized relation, according to above-mentioned tight continuous action relation, can carry out continuous trimming action.Therefore, just can guarantee occasion, realize the trimming action that good precision is high at high-speed sewing.
In addition, in the thread cutting method of the Sewing machines of the foregoing description, after the action of beginning trimming make action again before to make Sewing machines reverse action.As realizing that this reverses the means of action, can be to adopt just to reverse sewing electric motor, be equipped with special-purpose reverse with motor and utilize o etc. to make machinery reverse or the like.
More particularly as shown in Figure 3, make and carry out trimming action (program 1,2) after the release, confirm that then shank reverses (program 3), carries out shank and reverse (program 4).Like this, the pin that is positioned at stop position reverses and to turn back to upper dead center position.This pin detects at the position sensor of upper dead center position by main shaft.At this moment just be in the state that can easily seam band system thing be taken off or load onto.
In the present embodiment, reverse back (program 5) at above-mentioned shank, the 1st pin of making beginning is (for example, 400SPM) just to change (program 6) finished at shank with minimum sewing velocity.Because above-mentioned shank reverses action, make mechanism get back to trimming and carry out state, therefore, the loose ends arm pin 24 of thread releasing mechanism becomes again the state that the outer peripheral face with loose ends notch plate 21 is abutted against, thereby makes tension disk 32 carry out disc separating action again.That is to say, the possibility of the bad phenomenon that produces line knotting etc. is just arranged if carry out the high-speed sewing action immediately from the loose plate-like attitude that reverses after the release.
In addition, when making pin get back to top dead-centre nearby the time because shank reverses, among the figure not the thread take-up tension lever of expression turn back to the position that is lower than top dead-centre slightly, therefore, when then making, pin is when descending, thread take-up tension lever is once rising to after top dead center decline.At this moment, if begin high-speed sewing immediately, because the initial stage of this thread take-up tension lever rises, with the thread end behind the trimming unnecessarily from the suture needle pull-up, in like this with the line pull-up, just reduced the line amount of drawing by the pin hole of pin, just can not with the bottom line access node, will produce the unfavorable condition of trying to make a match and making when beginning knotting etc.But, adopt above-mentioned to begin to make with low speed, just can obtain the good action of making.
The 2nd pin is made action (program 7) with the speed of regulation later on, for example, waits making of stipulating by the x-y driving.In program 3,4, under the situation that shank does not reverse, also the speed with regulation begins to make action.
In such Sewing machines thread cutting method, because the action of making after the trimming release begins with low speed, therefore no matter the state of trimming how, the action of following of making is all carried out under kilter, this has just guaranteed that the state of making behind the trimming is very good.
More than be that the utility model people is revolved the specific description of moving to reality of the present utility model, but the utility model is not limited to the above embodiments, all conversion examples in the scope that does not break away from the utility model essence all belong to the utility model.
The cutting facility of above-described Sewing machines of the present utility model and method, rotation corresponding to the trimming cam that rotates with integrated spindle axis, make trimming action and disc separating action and main shaft synchronous by the main shaft interlinked mechanism, owing to carry out continuous trimming action according to tight interaction relation, even therefore under the situation of sewing speed, also can carry out good trimming action accurately, thereby can improve the reliability of the trimming action of Sewing machines.
Claims (2)
1, the cutting facility of Sewing machines comprises:
One thread cutting mechanism, this thread cutting mechanism have be fixed on the main shaft trimming cam that rotates with integrated spindle axis and the grooved cam that is wearing on the axial rearward end side end faces of trimming cam, and this grooved cam forms the trimming action message that makes the trimming cutting knife carry out the trimming action; With
One loosens the loose disc mechanism of the clamp pressure of tension disk when described trimming cutting knife carries out the trimming action;
It is characterized in that the cutting facility of described Sewing machines is provided with:
Pine dish recess with trimming cam unitary rotation; With
To pass to the linkage of tension disk side from the loose ends action message of this pine dish recess.
2, according to the cutting facility of the Sewing machines of claim 1, it is characterized in that,
It is the cam follower arm of center rotatably support that described thread cutting mechanism has corresponding to described trimming cam, with the horizontal axis;
Described linkage has: can according to from the loose ends action message of above-mentioned pine dish recess, with the shared horizontal axis of above-mentioned cam be the thread tension releasing disc that support rotationally at the center;
To be with the horizontal axis of above-mentioned thread tension releasing disc the rotation at center be converted to the vertical axis be the center rotate with thread tension releasing disc L font connecting rod in succession; With
The arm member that the clamping force that makes tension disk that corresponding L font connecting rod is the center rotation with the vertical axis is loosened.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14367496A JP3594735B2 (en) | 1996-05-14 | 1996-05-14 | Sewing machine thread trimmer |
| JP143674/96 | 1996-05-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2317238Y true CN2317238Y (en) | 1999-05-05 |
Family
ID=15344306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97204668 Expired - Lifetime CN2317238Y (en) | 1996-05-14 | 1997-05-14 | Thread-severing device for sewing machine |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP3594735B2 (en) |
| CN (1) | CN2317238Y (en) |
| TW (1) | TW330955B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100396837C (en) * | 2002-05-14 | 2008-06-25 | 重机公司 | Sewing machine with thread cutter |
| CN105951320A (en) * | 2016-06-22 | 2016-09-21 | 西安标准工业股份有限公司 | Thread cutting mechanism of sewing machine |
| CN115142252A (en) * | 2022-08-12 | 2022-10-04 | 江阴市埃夫隆电子科技有限公司 | Novel yarn cutter |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4686025B2 (en) * | 1999-12-16 | 2011-05-18 | Ｊｕｋｉ株式会社 | Sewing machine thread trimmer |
| CN102268787A (en) * | 2010-06-03 | 2011-12-07 | 顾飞龙 | Automatic thread trimming device of industrial sewing machine |
| CN102877230A (en) * | 2012-06-19 | 2013-01-16 | 新杰克缝纫机股份有限公司 | Automatic cutting device of sewing machine |
-
1996
- 1996-05-14 JP JP14367496A patent/JP3594735B2/en not_active Expired - Fee Related
-
1997
- 1997-05-13 TW TW086106352A patent/TW330955B/en not_active IP Right Cessation
- 1997-05-14 CN CN 97204668 patent/CN2317238Y/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100396837C (en) * | 2002-05-14 | 2008-06-25 | 重机公司 | Sewing machine with thread cutter |
| CN101230523B (en) * | 2002-05-14 | 2012-04-25 | 重机公司 | Sewing machine with thread cutter |
| CN105951320A (en) * | 2016-06-22 | 2016-09-21 | 西安标准工业股份有限公司 | Thread cutting mechanism of sewing machine |
| CN105951320B (en) * | 2016-06-22 | 2019-04-16 | 西安标准工业股份有限公司 | Thread cutting mechanism of sewing machine |
| CN115142252A (en) * | 2022-08-12 | 2022-10-04 | 江阴市埃夫隆电子科技有限公司 | Novel yarn cutter |
| CN115142252B (en) * | 2022-08-12 | 2023-11-17 | 江阴市埃夫隆电子科技有限公司 | Novel yarn cutter |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3594735B2 (en) | 2004-12-02 |
| TW330955B (en) | 1998-05-01 |
| JPH09299661A (en) | 1997-11-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |