CN1256476C - Double-thread overlock sewing machine - Google Patents
Double-thread overlock sewing machine Download PDFInfo
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- CN1256476C CN1256476C CN 01110337 CN01110337A CN1256476C CN 1256476 C CN1256476 C CN 1256476C CN 01110337 CN01110337 CN 01110337 CN 01110337 A CN01110337 A CN 01110337A CN 1256476 C CN1256476 C CN 1256476C
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Abstract
The present invention provides a double chain stitch sewing machine which is capable of changing over a thread balancing thread tension at a low cost. A thread tension device of the double chain stitch sewing machine is capable of vertically moving a tension releasing lever. When the lever is moved upward, the first thread balancing thread tension in which the tension of a needle thread is put into a tense state and the tension of a looper thread is put into a slackened state, is attained. When the tension releasing lever is moved downward, the second thread balancing thread tension, in which the needle thread is put into the slackened state and the looper thread is put into the tense state, is attained. When a presser foot is moved upward, the tension releasing lever moves upward cooperatively therewith and the thread balancing thread tension changes over to the first thread balancing thread tension. When a control lever is controlled, the tension releasing lever moves downward and the thread balancing thread tension is changed over to the second thread balancing thread tension.
Description
Technical field
The present invention relates to a kind of double-thread overlock sewing machine, particularly relate to the double-thread overlock sewing machine that a kind of clamp state can be changed.
Background technology
Utilizing double-thread overlock sewing machine to make continuously under the situation of many layers cloth (grey cloth), reserving between cloth and cloth sometimes at interval, the linear slit (needle tracking) that forms so-called " idle loop " between cloth and cloth is connected, thereby makes operation continuously.
Be tension with upper thread when making, bottom line is the clamp condition mode of relaxed state to be made, but idle loop adopts upper thread to be relaxed state when forming, and bottom line is the clamp condition mode of tension.Like this, the switching of the clamp state (tension state) of upper thread and bottom line is to be undertaken by the line tension device.
The line tension device has: a pair of clamp dish that upper thread and bottom line are seized on both sides by the arms, and to move the thread tension releasing disc that freely mode is set between a pair of clamp dish and has a pair of loose ends pawl.Each yarn is tension under the state of being seized on both sides by the arms by the clamp dish, if insert the loose ends pawl of thread tension releasing disc, then yarn is relaxed state.That is: thread tension releasing disc displaceably is set up between 2 positions, when it was positioned at a side, the loose ends pawl of this side was inserted in the clamp dish of upper thread side, and upper thread is relaxed state, the loose ends pawl of opposite side is not inserted in the clamp dish of bottom line side, and bottom line is tension.On the contrary, when thread tension releasing disc was positioned at opposite side, the loose ends pawl of a side was not inserted in the clamp dish of upper thread side, and upper thread is tension, and another loose ends pawl is inserted in the clamp dish of bottom line side, and bottom line is relaxed state.
So, can switch the clamp state by mobile thread tension releasing disc.This thread tension releasing disc is driven by cylinder or solenoid.
And the switching of this clamp state is not limited only to carry out cloth and makes the occasion that forms with idle loop, also changeable clamp state under the situation that fabric thickness changes when making.
The switching of clamp state must be carried out according to the opportunity of making, and therefore must carry out high-precision control, for this reason, must carry out Electronic Control to cylinder or the solenoid that drives thread tension releasing disc.And for according to switching the clamp state opportunity of handling the needle of Sewing machines, motor also must employing can carry out electronically controlled electric motor.
But, if adopt electric motor, whole Sewing machines is carried out electronically controlled words like this, just the problem that manufacturing cost improves appears then.
Summary of the invention
The object of the present invention is to provide the double-thread overlock sewing machine that a kind of cost is low, can switch the clamp state.
Above-mentioned purpose of the present invention is achieved in that a kind of double-thread overlock sewing machine, and it utilizes upper thread and bottom line to form linear slit, and this double-thread overlock sewing machine has:
Upper thread clamp portion is used for the tension force of upper thread is switched to tension and relaxed state;
Bottom line clamp portion is used for the tension force of bottom line is switched to tension and relaxed state;
Wherein, also have:
Clamp state switching member, it is provided with pin between described upper thread clamp portion and described bottom line clamp portion, and this clamp state switching member moves back and forth between described upper thread clamp portion and described bottom line clamp portion, when it is positioned at a side, the clamp state of the combination of the tension force of upper thread and bottom line as the 1st clamp state, when being positioned at opposite side, the clamp state of the combination of the tension force of upper thread and bottom line as the 2nd clamp state different with above-mentioned the 1st clamp state;
Reciprocating device, it comprises: the loose ends back bar, it engages with pin on being arranged on described clamp state switching member, makes described clamp state switching member to a described side shifting by angle displacement; Bend, it is arranged on the end of a side of described clamp state switching member, and this reciprocating device makes described clamp state switching member move to described opposite side by the described bend that stretches to described opposite side,
The angle displacement of described loose ends back bar, interlock carries out in the function operations that presser feet is risen, and rise by making presser feet, thereby any clamp state from the 1st or the 2nd switches to another kind of clamp state.
According to the present invention, move by making clamp state switching member, can between the 1st clamp state and the 2nd clamp state, switch the clamp state of upper thread and bottom line.Because this clamp state switching member is the member that a kind of dependence moves its reciprocating device that moves back and forth with manpower from structure, so the operator can be by switching the clamp state arbitrarily opportunity.Therefore, do not need to resemble and carry out Electronic Control the prior art,, can reduce whole cost significantly so motor also can use cheap clutch motor.
In Sewing machines, has pedal etc. for example promotes presser feet with manpower mechanism.From structure clamp state switching member is moved mutually linkedly with this hoisting mechanism, do not need to install in addition separately drive unit, utilize the existing mechanism power mode of promptly can choosing that clamp state switching member is moved.
And the rising of presser feet is for example beginning when cloth is sent in sewing etc. presser feet to be risen.That is: in idle loop forms, switch to when making usually presser feet is promoted.So, on the structure with the rising of this presser feet mutually interlock clamp state switching member is moved, can automatically switch to clamp state when making according to the time of making beginning like this.
Double-thread overlock sewing machine of the present invention, it is characterized in that having a kind of when presser feet rises mutually linkedly make the clamp state switching member that switches on the another kind of clamp state send back to mechanism on preceding a kind of clamp state with the manpower mode.
The formation of claim 2 of the present invention is: with presser feet mutually interlock clamp state switching member is moved, can switch the clamp state making when beginning like this.And in claim 3 of the present invention, be provided with a kind of like this mechanism, it utilizes manpower to make clamp state switching member turn back to original state, so, the state the when operator can be when with the naked eye confirming the cloth sewing finishing switches to the clamp state idle loop and forms.
Double-thread overlock sewing machine of the present invention, wherein, has retainer, described retainer is formed with elastic stage and is embedded into protuberance in two holes that form on the assigned position of described clamp state switching member, be embedded in any one hole in described two holes with elastic stage by described protuberance, thereby the described clamp state switching member that moves to a described side or described opposite side by described reciprocating device is fixed.
According to the present invention, because clamp state switching member remains on 2 positions with elastic stage, so the vibration during operation etc. is not easy to cause clamp state switching member to move.And the switching of clamp state only need overcome elastic force to be moved clamp state switching member to get final product, do not need complicated operations.
Double-thread overlock sewing machine of the present invention is characterized in that above-mentioned the 1st clamp state is that upper thread is a tension, and bottom line is a relaxed state; Above-mentioned the 2nd clamp state is that upper thread is a relaxed state, and bottom line is a tension.
According to the present invention, for example, carry out cloth by the 1st clamp state and make, carry out idle loop by the 2nd clamp state and form, so just can very successfully form the idle loop of rope form.
The switching of clamp state is not limited to this form, for example also can switch the 1st clamp state and the 2nd clamp state under the situation when the fabric thickness of making changes etc.
Below in conjunction with accompanying drawing shown in the embodiment, the present invention is described in further detail.
Description of drawings
Fig. 1 is the oblique view of formation of the double-thread overlock sewing machine 30 of expression the present invention the 1st embodiment;
Fig. 2 watches the needle plate 32 of Sewing machines 30 and the oblique view of presser feet 37 from oblique rear;
Fig. 3 is the exploded perspective view of presser feet 37;
The presser feet 37 when Fig. 4 is 35,36 risings of expression pin and the sectional drawing of needle plate 32;
The presser feet 37 when Fig. 5 is 35,36 declines of expression pin and the sectional drawing of needle plate 32;
Fig. 6 is the expression cloth is formed the process of linear slit when making by upper thread 77,78 and bottom line 79 a oblique view;
Fig. 7 is the oblique view of the route of expression upper thread 77,78 of Sewing machines 30 and bottom line 79;
Fig. 8 is the oblique view of the formation of expression presser feet elevating mechanism 200;
Fig. 9 is the exploded perspective view of line tension device 60;
The front elevation of the line tension device 60 when Figure 10 is the formation of expression idle loop;
The side view of the line tension device 60 when Figure 11 is idle loop formation;
Figure 12 is the front elevation of the line tension device 60 of expression cloth when making;
Figure 13 is the side view of the line tension device 60 of expression cloth when making;
The oblique view of the state of each line 77～79 when Figure 14 is the formation of expression idle loop;
The schematic diagram of the Sewing machines when Figure 15 is expression employing pedal 250, knee switch 260;
Figure 16 is the schematic diagram of the Sewing machines when representing not use operating portion.
The specific embodiment
See figures.1.and.2, wherein Fig. 1 is the oblique view of the double-thread overlock sewing machine 30 of expression the present invention the 1st embodiment, and Fig. 2 represents from behind with the oblique view after near the amplification needle plate 32 of Sewing machines 30.Sewing machines 30 has sewing machine head 31, and the sewing machine body 33 that is arranged on sewing machine head 31 tops.Be provided with the tension disk 39 and the line tension device 60 of a plurality of clamp members 130 of tool at the base end part of this sewing machine body 33; Leading section at this sewing machine body 33 is equipped with pin 35,36 by needle bar 61.Needle bar 61 is supported in the leading section of sewing machine body 33, and can vertical lift displacement, in the pin folder 34 of the bottom of needle bar 61,2 pins 35,36 by about leave the compartment of terrain vertical fixing.At the rear of needle bar 61, be provided with pressure bar 59 abreast with needle bar 61.In the bottom of this pressure bar 59 presser feet 37 is installed.Pressure bar 59 is supported in the mode that can carry out free upper and lower displacement, and is subjected to the downward pressure of spring.Flatly dispose needle plate 32 on sewing machine head 31, presser feet 37 is pressed against on this needle plate 32 with elastic stage.
Making operation is, cloth is layered on the sewing machine head 31, seizes cloth on both sides by the arms by needle plate 32 and presser feet 37, according to predetermined cloth feeding direction A (among Fig. 1 be a left side tiltedly rear) carry cloth on one side, pin 35,36 is pumped on one side, cloth is made.
This crosspointer double-thread overlock sewing machine 30 is used to make around the sleeve and the bottom of T-shirt for example (cotta garden neck shirt) etc., when making operation, carry some clothes continuously, reserve at interval, between cloth and cloth, form idle loop 38 on one side, Yi Bian make operation continuously.And idle loop 38 is cut off by suitable shearing device.
With reference to Fig. 3, it is the exploded perspective view of presser feet 37.The component part of presser feet 37 comprises: presser feet body 40, presser feet base portion 41 and auxiliary presser feet 152.Presser feet base portion 41 is fixed on the bottom of foot-pressing bar 59 via screw 52, and presser feet body 40 is installed on this presser feet base portion 41.Presser feet body 40 is tabular, and its leading section (cloth feeding direction A upstream-side-end) is crooked upward, and the mode that can carry out free displacement with angle around the angle displacement axis L1 that direction is to the left and right extended is installed on the presser feet base portion 41.Bolt 62 and nut 63 are screwed in the presser feet base portion 41, limit the angle displacement amount of presser feet body 40 with the bottom of bolt 62.On this presser feet body 40, be formed with the rectangular-shaped opening 43 that extends to cloth feeding direction A, be embedded in auxiliary presser feet 152 at this opening 43.
On auxiliary presser feet 152, more be partial to cloth feeding direction A downstream place comparing with needle falling hole 48,49, form through hole 153.This through hole 153 is formed on the position than the horizontal stripe 73 of needle plate 32 more inclined to one side on the front (cloth feeding direction A upstream side) shown in Fig. 4,5.
And leaf spring 151 is installed into above the back side 55 of pressing plate 44 covers rearward end (end in cloth feeding direction A downstream).The end of leaf spring 151 rotates into the rearward end (end in cloth feeding direction A downstream) of auxiliary presser feet 152, fix with screw 53, be formed with crooked upward bend 154 on leading section (end of cloth feeding direction A upstream side), this bend 154 is inserted in the above-mentioned through hole 153 of auxiliary presser feet 152.
Compression helical spring 47 is inserted on the bolster 45 of auxiliary presser feet 152.Bolster 45 and spring 47 vertically are inserted into from the below on the presser feet base portion 41 in the formed patchhole 46.The bolster 45 that inserts from the below of patchhole 46 is twisted with the screw 64 that inserts from the top of patchhole 46 and is lumped together, and like this, auxiliary presser feet 152 is being installed on the presser feet body 40 under the state that bears the spring downward pressure.And at this moment, the pressure foot 44 of auxiliary presser feet 152 is embedded in the opening 43 of presser feet body 40.
Following with reference to Fig. 4～Fig. 6, describe the operation of making of double-thread overlock sewing machine 30 in detail.State when the sectional drawing of the presser feet 37 when Fig. 4 and Fig. 5 are the formation of expression idle loop and the state of needle plate 32, Fig. 4 are pin 35,36 risings; Fig. 5 is pin 35,36 state when descending, and Fig. 6 is the oblique view of expression cloth linear slit (needle tracking) shape that upper thread 77,78 and bottom line 79 produce when making.
On needle plate 32 from cloth feeding direction A upstream side side downstream, work feed groove 80, pawl 72 and back work feed groove 81 before forming.Each work feed groove 80,81 extends along cloth feeding direction A, work feed tooth 70 before being provided with in preceding work feed groove 80; In back work feed groove 81, be provided with back work feed tooth 71.Each work feed tooth 70,71 moves by elliptical orbit in work feed groove 80,81 respectively, the cloth on the needle plate 32 is sent to the downstream of cloth feeding direction A.
Before formed pawl 72 between work feed groove 80 and the back work feed groove 81, the otch that goes out the コ font by cutting on needle plate 32 forms, the both ends at the cloth feeding direction A upstream side of the otch of this コ font are formed with the pin portion 75 that falls that is used to insert pin 35,36.And, between the cloth feeding direction A downstream of the otch of this コ font and back work feed groove 81, have the horizontal stripe 73 that direction to the left and right (in Fig. 4,5 with the perpendicular direction of paper) is extended.
And, presser feet 37, corresponding with the above-mentioned a pair of pin portion 75 that falls of needle plate 32, disposed a pair of needle falling hole 48,49 of above-mentioned auxiliary presser feet 152, pin 35,36 is inserted into respectively in the pin portion 75 that falls of the needle falling hole 48,49 of auxiliary presser feet 152 and needle plate 32.And below the pin portion 75 that falls, ring apical organ (looper) 74 direction (with Fig. 4,5 the perpendicular direction of paper) to the left and right moves back and forth.
The formation method of the linear slit of double-thread overlock sewing machine 30 below is described.On the pin 35,36 on right and the left side, penetrate upper thread 77,78 respectively and pump.If pin 35,36 drops to and after bottom dead center begins to rise, then form upper thread ring (coil) 82,83.At this moment, the ring apical organ 74 from the right side move to the left side (Fig. 4,5 from the paper inboard in face of; Among Fig. 6 from the right side to the left), be inserted in each upper thread ring 82,83.At this moment state as shown in Figure 4.
Like this, under the state that each upper thread 77,78 is caught by ring apical organs 74, as Fig. 4, shown in Figure 6 like that, each pin 35,36 rising.When pin 35,36 rises, the cloth on the needle plate 32 is sent the amount of 1 pin by preceding work feed tooth 70 and back work feed tooth 71 to the downstream of cloth feeding direction A.And, in Fig. 4, drawing shown in Figure 5, the state when expressing idle loop and forming, so, at this moment established idle loop 38 is rearward sent the amount of 1 pin by back work feed tooth 71.
In addition, with the work feed action synchronised of work feed tooth 70,71, the ring apical organ 74 that is inserted in the upper thread ring 82,83 moves to cloth feeding direction A upstream side, makes a concession action.Like this, between bottom line 79, each upper thread 77,78 and ring apical organ 74, form 2 spaces 84,85.Thus, when the pin 35,36 that reaches top dead-centre descends once more, be inserted in the above-mentioned space 84,85, then, ring apical organ 74 moves to the right, withdraws from each upper thread ring 82,83.Below identical with foregoing, ring apical organ 74 is inserted into the pin 35,36 that reaches bottom dead centre when rising once more in the formed upper thread ring 82,83 from the right side, and catches upper thread 77,78.By repeating such action, as shown in Figure 6, can form linear slit.
As mentioned above, on auxiliary presser feet 152, form needle falling hole 48,49, forming spigot surface 50 than this side end the inside, needle falling hole 48,49 more close the place aheads (cloth feeding direction A upstream side).Spigot surface 50 forms the state of inclination downwards towards cloth feeding direction A downstream, so that the cloth of sending into is successfully led.
In addition, as described above, auxiliary presser feet 152 is provided with helical spring 47 and leaf spring 151, and leaf spring 151 is set at the back of needle falling hole 48,49 between the position of rearward end.Helical spring 47 is pressed into auxiliary presser feet 152 on the needle plate 32 with elastic type.
Begin the work feed material once more if form state with idle loop, begin to make operation, the cloth front end that is then sent is inserted on the spigot surface 50 below the leading section of auxiliary presser feet 152, and auxiliary presser feet 152 is raised, and upwards floats.Leaf spring 151, the bend 154 of its front end is inserted in the through hole 153, and can carry out elastic displacement up and down significantly, so, even auxiliary presser feet 152 upwards floats, also can be pressed in reliably on the horizontal stripe 73, idle loop is kept.
With reference to Fig. 7, the oblique view of the upper thread 77,78 of its expression Sewing machines 30 and the route of bottom line 79.Each line 77～79 of reeling is directed into pin 35,36 or ring apical organ 74 by tension disk 39 pairing clamp members 130 respectively.In upper thread 77,78, the upper thread 77 and the bottom line 79 on right side are directed on the tension disk 39 by line tension device 60 after reeling.That is to say to have only the upper thread 78 in left side not utilize line tension device 60 to switch the clamp state.
With reference to Fig. 8, the oblique view of the formation of its expression presser feet elevating mechanism 200.Presser feet 37 is pushed downwards by stage clip 204, utilizes manpower, pushes down on the pedal by the operator in the present embodiment, and presser feet is risen.
The presser feet elevating lever 202 of presser feet elevating mechanism 200 is connected on the sewing machine body in the inboard of sewing machine body, and it can be swung around axis L2, and leading section is connected on the pedal by mechanical power transmission mechanisms such as chain and steel wire ropes.And the base end part of presser feet elevating lever 202 and presser feet elevating shaft 201 links together.
Therefore, if the operator pushes down on the pedal, the leading section of presser feet elevating lever 202 is applied downforce to arrow F direction, so, presser feet elevating shaft 201 makes pressure bar 59 overcome the elastic force of giving as security excellent spring 204 by this rotation and rises just along the rotation of arrow B direction, so presser feet 37 rises.
On presser feet elevating lever 202, be connected with from the sewing machine body inboard to face side in front and back upwardly extending thread tension releasing lever rod 203.This thread tension releasing lever rod 203 is propped up by axle in the mode that can rotate around axis, if depress presser feet elevating lever 202 along arrow F direction, thread tension releasing lever rod 203 just carries out angle displacement along arrow D direction so.Front end at this thread tension releasing lever rod 203 is fixed with loose ends back bar 211 by loose ends piece 210.Utilize this loose ends back bar 211 to come control wire tensioner 60, the clamp state (tension force) of upper thread and bottom line is switched.
With reference to Fig. 9, the exploded perspective view that its expression line tension device 60 constitutes.Line tension device 60 is by clamp platform 100, constitute as the thread tension releasing disc 102 of tension adjustment member and upper thread clamp portion 103 and bottom line clamp portion 104.Clamp platform 100 is fixed on the base end part of sewing machine body 33 by screw 110.
Thread tension releasing disc 102 is a long plate shape, and it displaceably is installed on the clamp platform 100.On this thread tension releasing disc 102, it is formed with slotted hole 107,108 in both ends up and down, inserts the clamp rod 109 of upper thread clamp portion 103 in the slotted hole 107 of upside, and the base end part of this clamp rod 109 is fixed on the clamp platform 100.Equally, insert the clamp rod 109 of bottom line clamp portion 104 in the slotted hole 108 of downside, the base end part of this clamp rod 109 is fixed on the clamp platform 100.Like this, thread tension releasing disc 102 is to be supported in the mode that can move up and down with respect to clamp platform 100.
Be installed in base end part one side of the clamp rod 109 on the clamp platform 100, upper thread guider 115 be installed, and upper thread clamp portion 103 be installed in front end one side.Upper thread clamp portion 103, its a pair of clamp dish 116,117, felt 118, cap 119 and spring 120 are inserted on the clamp rod 109, and leading section is twisted mutually with clamp button 121 and is closed.Clamp dish 116,117 overlaps with elastic stage mutually under the elastic force effect of spring 120 mutually, and the precession that basic elastic force can be by clamp button 121 or screw is adjusted.Tension force during upper thread 82 tensionings of therefore, being seized on both sides by the arms between a pair of clamp dish 116,117 can be by clamp button 121 precession or screw adjust.Because this to be formed in the ring apical organ plate tension portion 104 also be the same, so for these corresponding component parts, mark identical reference symbol, its explanation is omitted.
Top at the slotted hole 107 of above-mentioned thread tension releasing disc 102 is formed with loose ends pawl 122, below the bottom of slotted hole 108 in be formed with ring apical organ loose ends pawl 123.Loose ends pawl 122 is configured in the opposite of a pair of clamp dish 116,117 of upper thread clamp portion 103, and is same, and ring apical organ loose ends pawl 123 is configured in the opposite of a pair of clamp dish 116,117 of bottom line clamp portion 104.
In addition, in the bottom of thread tension releasing disc 102, be formed with locating hole 212 and following locating hole 213 these 2 slotted holes.The bending forwards bottom of thread tension releasing disc 102 forms bend 216.In the bottom of clamp platform 100 retainer 214 that is made of leaf spring is installed, on this retainer 214, is formed with the protuberance 215 that is embedded into elastic stage in the above-mentioned locating hole 212,213.So, when thread tension releasing disc 102 is moved upward, in the locating hole 213, thread tension releasing disc 102 is positioned under the protuberance 215 of retainer 214 is embedded into elastic stage.On the contrary, when thread tension releasing disc 102 was mobile downwards, the protuberance 215 of retainer 214 was embedded in the locating hole 212 with elastic stage, positions.
As mentioned above, on the leading section of the front side of the thread tension releasing lever rod 210 of presser feet elevating mechanism 200, be fixed with the thread tension releasing lever 211 that is the L type substantially by loose ends piece 210.This thread tension releasing lever 211 moves up and down leading section by the rotation of thread tension releasing lever rod 203.
Central portion at thread tension releasing disc 102 is equipped with pin 217, if above-mentioned thread tension releasing lever 211 carries out angle displacement, and the displacement upward of bar front end, so, the pin 217 of thread tension releasing disc 102 just is pulled on the bar front end, and thread tension releasing disc 102 is moved upward.
One end of steel wire rope 221 is installed on the bend 216 of bottom of thread tension releasing disc 102.The other end of this steel wire rope is connected with the action bars 220 that is installed in sewing machine body 33 leading sections as shown in Figure 1.The leading section that action bars 220 is installed in sewing machine body 33 allows on the maneuverable position of operator, and can carry out angle displacement.
The used brake wire of the structure of steel wire rope 221 and bicycle etc. is identical.That is to say, the steel wire that inserts the free displacement of energy at flexible tube interior constitutes, this steel wire rope 221 is arranged on the thread tension releasing disc 102 from action bars 220 to line tension device 60, if the bottom of push bar 220, make it carry out angle displacement, so, just can pass through steel wire rope 221, pulling thread tension releasing disc 102 moves down thread tension releasing disc 102 downwards.
That is to say, can utilize loose ends back bar 211 that thread tension releasing disc 102 is moved up; Utilize action bars 220 that thread tension releasing disc 102 is moved down.
Therefore, as Figure 10, shown in Figure 11, if utilize action bars 220 thread tension releasing disc 102 to be placed the words of below by steel wire rope 221, then the lax pawl 122 of upper thread is inserted in the clamp dish 116,117 of upper thread clamp portion 103, simultaneously, the loose pawl 123 of bottom line is drawn out from the clamp dish 116,117 of bottom line clamp portion 104.So clamp state at this moment makes upper thread 77 be in relaxed state, make bottom line 79 be in tensioning state.
At this moment thread tension releasing disc 102 utilizes retainer 214 and last locating hole 212 to position.
On the contrary, as shown in Figure 12 and Figure 13, as if the words that thread tension releasing disc 102 moved up with loose ends back bar 211, clamp dish 116, the 117 interior lax pawls 122 of upper thread that then are inserted into upper thread clamp portion 103 are drawn out, simultaneously, the lax pawl 123 of bottom line is inserted in the clamp dish 116,117 of bottom line clamp portion 104.At this moment clamp state makes upper thread 77 be in tensioning state, makes bottom line be in relaxed state.
At this moment thread tension releasing disc 102 utilizes retainer 214 and following locating hole 213 to position.
As Fig. 6 explanation like that, when cloth is made, about upper thread 77,78 between reel the formation linear slit by bottom line about 79.So, when cloth is made, bottom line 79 about upper thread 77,78 between can successfully reel, and, with about upper thread 77,78 be wound onto on the bottom line 79 and not produce lax requirement such, set the tension force of bottom line 79, upper thread 77,78.During ordinary sewing, the tension force of upper thread 77,78 is generally greater than bottom line 79.
To this, when idle loop forms, if the state that the idle loop that forms is opened about being then might be winding on the ring apical organ 74, so, must with bottom line 79 twist around about upper thread 77,78, make idle loop 38 be the knot shape.Therefore, when forming idle loop, the tension force of bottom line 79 must be higher than cloth when making.
As mentioned above, ring apical organ 74 carries out left and right sides reciprocating motion, and opposite wire loop 82,83 is come in and gone out from the right side.So if encircle apical organ 74 from 82,83 drawings to the right of 2 upper thread rings, then at first the upper thread ring 83 in left side leaves from ring apical organ 74 when idle loop forms.At this moment, when both tension force of the upper thread 77 on right side and the upper thread in left side 78 was high, under the state that ring apical organ 74 is not extracted from the ring of the upper thread 77 on right side as yet, the upper thread 78 in the left side that spins off from ring apical organ 74 was tightened up earlier, can not form the idle loop of knot shape.
In order to prevent this problem, as shown in figure 14, when idle loop forms, the upper thread that extract the apical organ 74 from ring the back, the tension force of the upper thread 77 on right side is less than cloth when making in the present embodiment.So when extracting the upper thread 78 in left side from ring apical organ 74, the upper thread 77 on the right side that tension force is little also is pulled out from ring apical organ 74 together, can successfully form the idle loop of knot shape.
That is to say when idle loop forms, be not 2 upper threads 77,78, and only be that the upper thread 77 on right side is switched to relaxed state that the upper thread 78 in left side is protected common tension with the clamp member 130 of tension disk 39 as shown in Figure 7.
Followingly make the switching that operation illustrates the tension force of upper thread 77,78 and bottom line 74 according to actual.
When making beginning, the operator pushes down on the pedal for cloth being inserted between needle plate 32 and the presser feet 37, promotes presser feet 37.So, phase interlock therewith, LSOR back bar 211 carries out angle displacement, thread tension releasing disc 102 is pushed to, shown in Figure 12,13 like that, be located on the top position.At this moment, bottom line 74 is in relaxed state; The upper thread 77 on right side is in tension.At this moment clamp state is the 1st clamp state.
Then, on one side the work feed material, operation made on one side.And, when cloth makes when making the end of job to the end, because following formation idle loop, so, when operator's Visual Confirmation has arrived cloth when terminal, press aforesaid operations bar 220.So thread tension releasing disc 102 is left behind by steel wire rope 221, be in Figure 10, state shown in Figure 11.
That is to say that the upper thread 77 on right side is in relaxed state; Bottom line 79 is in tension.At this moment clamp state is the 2nd clamp state.Like this, by switching to the 2nd clamp state, can successfully form the rope form idle loop from the 1st clamp state.And, utilize retainer 214 that thread tension releasing disc 103 is remained on the lower position with elastic stage.
Then,, promote presser feet 37 once more, insert cloth in order to make following cloth.At this moment, as described above,, utilize LSOR back bar 211 that line tension device 60 is automatically switched to the 1st clamp state with presser feet elevating mechanism interlock mutually.
In the above-described embodiments, move on the lower position (the second clamp state), structurally carry out move operation with action bars 220 in the hand operated mode in order to make upper thread thread tension releasing disc 102.But the present invention is not limited only to this formation, for example, as shown in Figure 15, also can utilize pedal 250 or knee switch 260 to make upper thread thread tension releasing disc 102 move to the version of lower position.Pedal 250, knee switch 260 are connected to the bend 216 of thread tension releasing disc 102 respectively with steel wire rope 231 or chain, by pulling down steel wire rope 231, thread tension releasing disc 102 is moved on the lower position.
If further describe, then can carry out the angle displacement operation with operator's pin as the pedal 250 shown in Figure 15 is upper right, steel wire rope 231 is connected on the pedal front end, and the operator can make thread tension releasing disc 102 move on the lower position by pushing down on the pedal.
The operator is if push knee receiving plate 261 with knee, then 261 of knee receiving plates shown in the arrow E symbol like that, be that swing downwards at the center with pin 263.Along with the swing of this knee receiving plate 261, piece 264 and the connecting axle 262 that is fixed on the piece 264 are swung around pin 263, and the steel wire rope 231 that is connected on the connecting axle 262 is tightened up, and thread tension releasing disc 102 moves downwards.Like this, operate with knee, thread tension releasing disc 102 is moved the position downwards by the operator.
Another embodiment also can not establish functional units such as action bars 220, pedal 250, knee switch 260 in its formation as shown in figure 16.That is to say, as shown in Figure 16, also can adopt such formation: promptly the bottom of thread tension releasing disc 102 only is provided with the bend 216 to the front bending, downwards by this bend 216, thread tension releasing disc 102 is moved the position by the operator downwards.
In addition, in the above-described embodiments, the switching of line tension state can be adopted as when cloth is made and the structure of idle loop switching when forming, but the present invention also not only is confined to such embodiment, for example also can adopt such structure, i.e. structure as being applicable to the occasion of when the cloth state changes, switching tension state.
For example, when making the cloth that thickness changes, the part thin to cloth reduces tension force, and the part thick to cloth increases tension force, so that can be applicable to the occasion of switching tension state as described above.
In addition, the tension state of upper thread and bottom line combination is not limited only to be tension on one side, and another side is the combination of relaxed state, also can be that both sides all are the 1st clamp states of tension, and both sides all are the combinations etc. of the 2nd clamp state of relaxed state.
As mentioned above, according to the present invention, a kind ofly carry out the mechanism that the clamp state switches with manpower because be provided with, so do not need to carry out Electronic Control etc., motor also can adopt cheap clutch motor, can reduce the totle drilling cost of Sewing machines significantly.
In addition, its formation is and the mechanism that makes presser feet lifting interlock mutually to come the clamp state is switched, so can automatically switch the clamp state according to the time of making beginning.Yet be provided with by with presser feet interlock mutually, after switching the clamp state, make the mechanism of its hairpinning in the manpower mode.
Moreover, by retainer is set, can carry out the location and the maintenance of clamp state switching member at an easy rate.
The switching of this clamp state is applicable to that alternately carrying out cloth makes the occasion that forms with idle loop, and the occasion of making cloth that thickness changes etc.
Claims (6)
1, a kind of double-thread overlock sewing machine, it utilizes upper thread and bottom line to form linear slit, and this double-thread overlock sewing machine has:
Upper thread clamp portion, it is used for the tension force of upper thread is switched to tension and relaxed state;
Bottom line clamp portion, it is used for the tension force of bottom line is switched to tension and relaxed state,
It is characterized in that also having:
Clamp state switching member, it is provided with pin between described upper thread clamp portion and described bottom line clamp portion, and this clamp state switching member moves back and forth between described upper thread clamp portion and described bottom line clamp portion, when it is positioned at a side, the clamp state of the combination of the tension force of upper thread and bottom line as the 1st clamp state, when being positioned at opposite side, the clamp state of the combination of the tension force of upper thread and bottom line as the 2nd clamp state different with above-mentioned the 1st clamp state;
Reciprocating device, it comprises: the loose ends back bar, it engages with pin on being arranged on described clamp state switching member, makes described clamp state switching member to a described side shifting by angle displacement; Bend, it is arranged on the end of a side of described clamp state switching member, and this reciprocating device makes described clamp state switching member move to described opposite side by the described bend that stretches to described opposite side,
The angle displacement of described loose ends back bar, interlock carries out in the function operations that presser feet is risen, and rise by making presser feet, thereby any clamp state from the 1st or the 2nd switches to another kind of clamp state.
2, double-thread overlock sewing machine as claimed in claim 1 is characterized in that: have a kind of when presser feet rises mutually linkedly make the clamp state switching member that switches on the another kind of clamp state send back to mechanism on preceding a kind of clamp state with the manpower mode.
3, double-thread overlock sewing machine as claimed in claim 1 or 2 is characterized in that: have retainer, described retainer is formed with elastic stage and is embedded into protuberance in two holes that form on the assigned position of described clamp state switching member,
Be embedded in any one hole in described two holes with elastic stage by described protuberance, thereby the described clamp state switching member that moves to a described side or described opposite side by described reciprocating device is fixed.
4, double-thread overlock sewing machine as claimed in claim 1 is characterized in that: above-mentioned the 1st clamp state is that upper thread is a tension, and bottom line is a relaxed state; Above-mentioned the 2nd clamp state is that upper thread is a relaxed state, and bottom line is a tension.
5, double-thread overlock sewing machine as claimed in claim 2 is characterized in that: above-mentioned the 1st clamp state is that upper thread is a tension, and bottom line is a relaxed state; Above-mentioned the 2nd clamp state is that upper thread is a relaxed state, and bottom line is a tension.
6, double-thread overlock sewing machine as claimed in claim 3 is characterized in that: above-mentioned the 1st clamp state is that upper thread is a tension, and bottom line is a relaxed state; Above-mentioned the 2nd clamp state is that upper thread is a relaxed state, and bottom line is a tension.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000125183A JP2001300169A (en) | 2000-04-26 | 2000-04-26 | Double chain stitch sewing machine |
| JP2000125183 | 2000-04-26 | ||
| JP2000-125183 | 2000-04-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1320737A CN1320737A (en) | 2001-11-07 |
| CN1256476C true CN1256476C (en) | 2006-05-17 |
Family
ID=18635178
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01110337 Expired - Fee Related CN1256476C (en) | 2000-04-26 | 2001-04-04 | Double-thread overlock sewing machine |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2001300169A (en) |
| CN (1) | CN1256476C (en) |
| TW (1) | TW552332B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITVR20050056A1 (en) | 2005-05-06 | 2006-11-07 | Vi Be Mac Spa | SEWING MACHINE PRESENTING A BASE FOR WELCOMING INTERCHANGEABLE MEANS FOR THE SEWING OF FABRICS BY DIFFERENT TYPES OF POINT. |
| DE102009036988A1 (en) * | 2009-05-12 | 2010-12-16 | Nähmaschinenfabrik Emil Stutznäcker GmbH & Co. KG | Method for sewing a sewing material |
| CN103290625B (en) * | 2012-02-28 | 2017-03-01 | 顾飞龙 | The method of overseam sewing machine amount of saving the thread when trimming |
| CN103526455A (en) * | 2013-11-04 | 2014-01-22 | 吴江市祥盛纺织品有限公司 | Multifunctional sewing machine |
| CN108118454B (en) * | 2016-11-29 | 2023-07-07 | 拓卡奔马机电科技有限公司 | But fast separation and reunion's adjust knob lifts presser foot altitude mixture control mechanism |
| CN107354610B (en) * | 2017-09-11 | 2023-07-25 | 广东溢达纺织有限公司 | Electronic wire clamp device and sewing mechanism |
| CN108914403A (en) * | 2018-09-29 | 2018-11-30 | 广东金悦来自动化设备有限公司 | A kind of hat cap gas vent automatic sewing machine |
-
2000
- 2000-04-26 JP JP2000125183A patent/JP2001300169A/en active Pending
-
2001
- 2001-03-20 TW TW90106429A patent/TW552332B/en not_active IP Right Cessation
- 2001-04-04 CN CN 01110337 patent/CN1256476C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| TW552332B (en) | 2003-09-11 |
| CN1320737A (en) | 2001-11-07 |
| JP2001300169A (en) | 2001-10-30 |
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Granted publication date: 20060517 Termination date: 20100404 |