CN204570202U

CN204570202U - Sewing machines

Info

Publication number: CN204570202U
Application number: CN201520118558.XU
Authority: CN
Inventors: 桑原幸治; 中野元就
Original assignee: Brother Industries Ltd
Current assignee: Brother Industries Ltd
Priority date: 2014-02-28
Filing date: 2015-02-27
Publication date: 2015-08-19
Anticipated expiration: 2025-02-27
Also published as: JP2015160115A

Abstract

The utility model relates to Sewing machines, and it stably can switch upper thread applying tension force than ever, remove upper thread applying tension force.Sewing machines comprises depression bar, up-down mechanism, thread take-up tension lever, tension disk, switching mechanism, the first driving mechanism and the second driving mechanism.Switching mechanism has the first arm, the first force application component and switching member.First arm can swing to first direction and second direction.First force application component exerts a force to first direction to the first arm.During tangent line, the first driving mechanism makes the first arm swing ormal weight from usual position to second direction.When up-down mechanism makes depression bar rise, the second driving mechanism makes the first arm swing to second direction from usual position with the amount corresponding to the upper-lower position of depression bar.When depression bar up-down mechanism makes depression bar decline, the second driving mechanism makes the first arm swing to first direction from usual position with the amount corresponding to the upper-lower position of depression bar.Therefore, Sewing machines can stably perform tension force switching action than ever.

Description

Sewing machines

Technical field

The utility model relates to the Sewing machines that can be used in the presser feet of pushing down cloth and move up and down.

Background technology

Have kind of Sewing machines its can to presser feet move up and down with switch tension force is applied to upper thread, remove the interlock of both action of switching action (hereinafter referred to as tension force switching action) of tension force is applied to upper thread, non-interlock makes with switching.Japanese Unexamined Patent Publication Heisei 11 years No. 290568 Sewing machiness described in publication comprise operating rocker, screw, thread tension releasing disc and have the pull-up connecting rod etc. of groove.When making the thick thinner cloth of cloth, or do not have by change cloth feeding direction form the manufacturing process of needle tracking time, operator rotates operating rocker and is fixed on below groove by screw.Presser feet move up and down parts make to be equipped with presser feet depression bar rise.Screw is sticked in thread tension releasing disc, and tension disk is removed and applied tension force to upper thread.That is, presser feet movement upward applies tension force interlock each other with releasing to upper thread.In above-mentioned Sewing machines, do not rotate when operating rocker switches to because putting on the load of operating rocker and applies tension force after removing upper thread applying tension force.Therefore, the tension force switching action of Sewing machines is sometimes unstable.

Utility model content

The purpose of this utility model is to provide the Sewing machines that stably can switch than ever and upper thread be applied to tension force and releasing opposite line applying tension force.

The Sewing machines of technical scheme 1 comprises: depression bar, and it can load and unload the presser feet for pushing down cloth, up-down mechanism, it can make above-mentioned depression bar move up and down, thread take-up tension lever, it moves up and down along with the rotation of main shaft, tension disk, it is positioned at the upstream side of above-mentioned thread take-up tension lever on the feed path of upper thread, can apply tension force to upper thread, and switching mechanism, its can switch by above-mentioned tension disk to upper thread apply tension force and remove by above-mentioned tension disk, tension force is applied to upper thread, above-mentioned switching mechanism comprises: the first arm, and it extends along the vertical direction, can be fulcrum with bolster and swing to first direction and the second direction contrary with above-mentioned first direction, first force application component, it makes above-mentioned first arm swing to usual position to above-mentioned first direction to above-mentioned first arm force, and switching member, itself and above-mentioned first arm abut against, by above-mentioned tension disk tension force applied to upper thread or removing the state by above-mentioned tension disk, upper thread being applied to tension force when above-mentioned first arm is in usual position is switched according to the swing position of above-mentioned first arm after usual position swings to above-mentioned second direction, in this Sewing machines, comprise: the first driving mechanism, it is connected with above-mentioned first arm, when tangent line, this first driving mechanism makes above-mentioned first arm overcome the active force of above-mentioned first force application component and swing ormal weight from usual position to above-mentioned second direction thus operate above-mentioned switching member, and second driving mechanism, it is connected with above-mentioned up-down mechanism and above-mentioned first arm, when above-mentioned up-down mechanism makes above-mentioned depression bar rise, this second driving mechanism makes above-mentioned first arm swing to above-mentioned second direction with the amount corresponding to the upper-lower position of above-mentioned depression bar from usual position, when above-mentioned up-down mechanism makes above-mentioned depression bar decline, this second driving mechanism makes above-mentioned first arm swing to above-mentioned first direction with the amount corresponding to the upper-lower position of above-mentioned depression bar, above-mentioned first arm has to the outstanding protuberance in the direction orthogonal with the bearing of trend of above-mentioned first arm, the full swing amount that above-mentioned first arm swings to above-mentioned second direction from usual position under the effect of above-mentioned second driving mechanism is greater than the oscillating quantity that above-mentioned first arm swings to above-mentioned second direction from usual position under the effect of above-mentioned first driving mechanism, above-mentioned second driving mechanism comprises: the second arm, and it is connected with above-mentioned up-down mechanism and extends along the vertical direction, can with above-mentioned bolster for fulcrum swings to above-mentioned first direction and above-mentioned second direction, second force application component, it exerts a force to above-mentioned first direction to above-mentioned second arm, first abutting part, it is configured at than the position of above-mentioned protuberance by above-mentioned first direction side, and extends to above-mentioned first arm side from above-mentioned second arm, and shank, it is configured at than the position of above-mentioned first arm by above-mentioned second direction side, and extends to above-mentioned first arm side from above-mentioned second arm, above-mentioned first abutting part can abut against with above-mentioned first arm when above-mentioned second arm overcomes the active force of above-mentioned second force application component and swings to above-mentioned second direction, above-mentioned shank when above-mentioned first abutting part and above-mentioned first arm abut against away from above-mentioned first arm, further, above-mentioned shank can abut against with above-mentioned first arm when above-mentioned second arm swings to above-mentioned first direction from the state that above-mentioned first abutting part abuts with above-mentioned first arm.

First force application component of Sewing machines exerts a force to first direction to the first arm.First arm is in usual position when not being subject to the power from the first driving mechanism, the second driving mechanism.When up-down mechanism makes depression bar decline, the first arm swings to first direction under the effect of the active force of the second force application component of the first force application component and the second driving mechanism.Sewing machines has shank, and therefore, the first arm can stably turn back to usual position when having swung more than ormal weight.Therefore, the first arm stably turns back to usual position than during the power be only subject to from the first force application component.That is, Sewing machines can stably perform tension force switching action than ever.

The Sewing machines of technical scheme 2 can adopt following structure: above-mentioned second driving mechanism comprises adjustment part, and this adjustment part is connected with above-mentioned first abutting part and extends along the vertical direction, can be assemblied in above-mentioned second arm; Above-mentioned adjustment part has the long elongated hole of above-below direction; The above-below direction position of above-mentioned first abutting part relative to above-mentioned second arm can be changed by above-mentioned adjustment part being assemblied in above-mentioned second arm in the scope of above-mentioned elongated hole.The position of the first abutting part relative to the second arm can be changed in adjustment part in the scope of elongated hole, therefore, it is possible to the opportunity that adjustment the first abutting part and the first arm abut against.That is, Sewing machines can switch according to the position on the above-below direction of presser feet by tension disk to upper thread apply tension force and remove by tension disk, tension force is applied to upper thread.

The Sewing machines of technical scheme 3,4 can adopt following structure: above-mentioned second force application component is helical spring, and exerts a force to above-mentioned depression bar downwards; Above-mentioned second force application component to above-mentioned first direction to above-mentioned second arm apply active force be greater than above-mentioned first force application component to above-mentioned first direction to above-mentioned first arm apply active force.Therefore, the shank of the second arm pushes the first arm to first direction afterwards what abut against with the first arm.Therefore, the first arm is subject to the active force of the second force application component, and therefore, the first arm swings to first direction and turns back to usual position together with the second arm.Sewing machines can more stably perform tension force switching action.

The Sewing machines of technical scheme 5 can adopt following structure: above-mentioned tension disk comprises: the first tension disk, and it can apply tension force to upper thread; And second tension disk, it can apply tension force to upper thread, and is in than the position of above-mentioned first tension disk by above-mentioned feed path upstream side; Above-mentioned switching member, when above-mentioned first arm is in usual position, makes to apply tension force by above-mentioned first tension disk to upper thread, and releasing applies tension force by above-mentioned second tension disk to upper thread; Above-mentioned switching member, when above-mentioned first arm has swung more than afore mentioned rules amount to above-mentioned second direction from usual position, makes to remove applying tension force by above-mentioned first tension disk to upper thread, and applies tension force by above-mentioned second tension disk to upper thread.When making, the first tension disk applies tension force to upper thread, and the second tension disk is removed the tension force that upper thread applies.Upper thread can obtain suitable tension force from the first tension disk and form needle tracking with bottom line.When tangent line or when making presser feet increase, switching member applies tension force and removes to be switched upper thread applying tension force by the first tension disk, the second tension disk to upper thread to by the first tension disk, the second tension disk respectively.First tension disk is removed the tension force that upper thread applies, and the second tension disk applies tension force to upper thread.When tangent line, Sewing machines can obtain suitable tension force from the second tension disk and cut off upper thread.When making presser feet rise, Sewing machines can maintain suitable tension force from the second tension disk.Therefore, Sewing machines suitably can use the first tension disk and the second tension disk, and switches the tension force acting on upper thread.

The Sewing machines of technical scheme 6 can adopt following structure: above-mentioned first tension disk comprises: clamp axle, clamp platform, is inserted with the end side of above-mentioned clamp axle within it, a pair cable-clamping disc, it is supported on another side of above-mentioned clamp axle, can clip upper thread and apply tension force to upper thread, 3rd force application component, it is coated at the position of above-mentioned a pair cable-clamping disc of ratio by another side of above-mentioned clamp axle, to above-mentioned clamp platform side to above-mentioned a pair cable-clamping disc force, drive rod, it is inserted into the inside of above-mentioned clamp axle, this drive rod, when moving along the axle center of above-mentioned clamp axle to the direction of the other end of above-mentioned clamp axle, reduces above-mentioned 3rd force application component can remove the upper thread clamped by above-mentioned a pair cable-clamping disc tension force to the active force of above-mentioned a pair cable-clamping disc, and thread take-up spring, its end side is fixed on above-mentioned clamp axle, and another side is passed through from the groove being located at above-mentioned clamp platform, swings with the movement of upper thread under the effect of above-mentioned thread take-up tension lever, above-mentioned switching member comprises: spacer pin, and itself and above-mentioned clamp axle are abreast through the inside of above-mentioned clamp platform, and when this spacer pin moves to above-mentioned first tension disk side, its end side can block the swing path of above-mentioned thread take-up spring, 4th force application component, it exerts a force to the side making above-mentioned spacer pin away from above-mentioned first tension disk to another side of above-mentioned spacer pin, and switching pin, itself and above-mentioned spacer pin extend abreast, one end and above-mentioned first arm of this switching pin abut against, and when this switching pin moves to the direction of above-mentioned first tension disk, its other end can abut against with the other end of above-mentioned spacer pin and above-mentioned drive rod, when above-mentioned first arm has swung more than afore mentioned rules amount to above-mentioned second direction from usual position, above-mentioned switching pin moves to the direction of above-mentioned first tension disk, above-mentioned switching pin and above-mentioned drive rod abut against and above-mentioned drive rod are moved to above-mentioned first tension disk side, above-mentioned drive rod reduces above-mentioned 3rd force application component removes the upper thread clamped by above-mentioned a pair cable-clamping disc tension force to the active force of above-mentioned a pair cable-clamping disc, and, above-mentioned spacer pin overcomes the active force of above-mentioned 4th force application component and moves to above-mentioned first tension disk side and block the swing path of above-mentioned thread take-up spring.When making the first arm swing to second direction the amount being greater than ormal weight from usual position, spacer pin blocks the swing path of thread take-up spring.Spacer pin, regardless of the positioning precision of clamp platform relative to the rigging position of Sewing machines, can both block the swing path of thread take-up spring.

The Sewing machines of technical scheme 7,8 can adopt following structure: above-mentioned second arm comprises the second abutting part, this second abutting part is positioned at the side contrary with above-mentioned tension disk relative to above-mentioned first arm, and abuts against with the face by above-mentioned second that side of arm of above-mentioned first arm.First arm and the second abutting part abut against.Second abutting part prevents the first arm from moving to the second arm side when being subject to the power from tension disk.Therefore, Sewing machines can prevent from the first arm when swinging to first direction or second direction etc. with the second abutting part twisting.

Accompanying drawing explanation

Fig. 1 is the stereogram of Sewing machines 1.

Fig. 2 is the perspective elevation of Sewing machines 1.

Fig. 3 is the stereogram of driving mechanism 185, switching mechanism 150 and thread clamping mechanism 100.

Fig. 4 is the left view of switching mechanism 150 and thread clamping mechanism 100.

Fig. 5 is the II-II sectional view of Fig. 3.

Fig. 6 is the stereogram of depression bar up-down mechanism 20 and driving mechanism 60.

Fig. 7 is the rearview after being amplified by the second arm 61 of driving mechanism 60.

Fig. 8 is the I-I sectional view of switching mechanism 150 Fig. 1 when being in usual position.

Fig. 9 is the stereogram of the interlinked mechanism 95 of presser foot lifter spanner 96 when being in usual position.

Figure 10 is the stereogram of the interlinked mechanism 95 of presser foot lifter spanner 96 when being in the position swinging full swing amount.

Figure 11 is the front view of first arm 160 of switching mechanism 150 when being in usual position.

Figure 12 is the front view of the first arm 160 when switching mechanism 150 has swung the first ormal weight from usual position to second direction when tangent line.

Figure 13 is the I-I sectional view of switching mechanism 150 Fig. 1 when having swung the first ormal weight from usual position to second direction.

Figure 14 makes presser feet 25 be set up liter from lowermost position, the front view of the first arm 160 when switching mechanism 150 has swung the first ormal weight from usual position to second direction.

Figure 15 makes presser feet 25 move to uppermost position in fig-ure, the front view of the first arm 160 when switching mechanism 150 has swung more than first ormal weight to second direction from usual position.

Figure 16 makes presser feet 25 decline from uppermost position in fig-ure, and the second arm 61 returns in the way of usual position, the front view of the first arm 160 when shank 76 abuts with the main body 161 of the first arm 160.

Detailed description of the invention

With reference to accompanying drawing, an embodiment of the present utility model is described.The general structure of Sewing machines 1 is described with reference to Fig. 1, Fig. 2.In the following description, the top to bottom, left and right, front and rear shown in arrow in figure are used.

Sewing machines 1 comprises support portion 2, column sections 3, horn portion 4 and top ends 5.Support portion 2 extends in left-right direction, is provided with needle plate 9 in its left upper portion.Needle plate 9 has appearance pin hole.Support portion 2 has shuttle axle 21, shuttle mechanism 80, tangent mechanism 90 and motor of sewing machine etc. in inside.Shuttle axle 21 extends in left-right direction.The right-hand member of shuttle axle 21 is connected with lower shaft, and lower shaft is connected with belt wheel 23.The left end of shuttle axle 21 is connected with shuttle mechanism 80.Shuttle mechanism 80 has rotating shuttle.Rotating shuttle is positioned at the below of needle plate 9.Rotating shuttle is provided with shuttle sleeve.Shuttle sleeve holds the shuttle being wound with bottom line.Tangent mechanism 90 be positioned at shuttle mechanism 80 top and be needle plate 9 appearance pin hole near position.Tangent mechanism 90 comprises movable knife and dead knife.Movable knife can swing along the periphery of rotating shuttle.Tangent mechanism 90 also can be comprise two movable knifes, and two movable knifes can or the mechanism that remotely swing closer to each other along the periphery of rotating shuttle.Tangent mechanism 90 is connected with electromagnetic component 190 (with reference to Fig. 3) by tangential cam etc.Electromagnetic component 190 drives according to the input of tangent line signal.When electromagnetic component 190 drives, tangential cam action.Tangential cam transmits the driving force of shuttle axle 21 to movable knife.Upper thread 8 and bottom line are clipped between two cuttves and cut off upper thread 8 and bottom line by movable knife and dead knife.Motor of sewing machine is positioned at the right of belt wheel 23.The output shaft of motor of sewing machine is connected with belt wheel 23.Motor of sewing machine makes lower shaft rotate around the clockwise direction when left surface is observed, and shuttle axle 21 rotates around the counter clockwise direction when left surface is observed.Column sections 3 extends upward from the right part in support portion 2, has Timing Belt 31 etc. therein.Horn portion 4 extends to the left from the upper end of column sections 3, has top ends 5 in its left part.Horn portion 4 is relative with the upper surface in support portion 2, has main shaft 41 etc. therein.The right-hand member of main shaft 41 has belt wheel 42.Belt wheel 42 is positioned at the top of belt wheel 23, and both are connected by Timing Belt 31.Belt wheel 42 is linked with belt shaft 33 on right side.The right-hand member of belt shaft 33 is fixed with manual belt pulley 32.Manual belt pulley 32 can make main shaft 41 rotate by the operation of operator.Top ends 5 comprises shank supporting device 10, shank up-down mechanism 45, thread take-up tension lever driving mechanism 50, switching mechanism 150 (with reference to Fig. 3) and depression bar up-down mechanism 20 etc. in inside.Top ends 5 has thread clamping mechanism 100 at front surface.

As shown in Figure 2, shank supporting device 10 comprises shank 11, shank carrying cylinder 12, shank carrying cylinder 13 and shank anchor ear 14 etc.Shank 11 extends along the vertical direction.Shank carrying cylinder 12,13 is individually fixed in the frame of Sewing machines 1.Shank carrying cylinder 12,13 supports the upper and lower of shank 11 respectively, guides shank 11 to move along the vertical direction.The position of shank anchor ear 14 between shank carrying cylinder 12 and shank carrying cylinder 13 keeps shank 11.Shank anchor ear 14 is connected with shank up-down mechanism 45 by thread take-up tension lever driving mechanism 50.Shank up-down mechanism 45 is connected with the left end of main shaft 41.Motor of sewing machine can make main shaft 41 rotate.The driving force that shank up-down mechanism 45 is transmitted the rotation with main shaft 41 to shank anchor ear 14 and produced.Shank anchor ear 14 and thread take-up tension lever 51 are driven linkedly, and shank 11 is moved up and down.That is, main shaft 41 transmits driving with motor of sewing machine and the revolving force that produces to shank up-down mechanism 45 and thread take-up tension lever driving mechanism 50, thus drives shank up-down mechanism 45 and thread take-up tension lever driving mechanism 50.Thread take-up tension lever driving mechanism 50 has thread take-up tension lever 51.Thread take-up tension lever 51 moves up and down along with the rotation of main shaft 41, upwards mentions upper thread 8 (with reference to Fig. 1).The lower end side of shank 11 is exposed from the downside of top ends 5, and extends downwards.Shank 11 can install eedle 7 in lower end.The lower end of eedle 7 drops at shank 11 and passes through from the appearance pin hole of needle plate 9 (with reference to Fig. 1) when lowermost position is put and arrive rotating shuttle.Eedle 7 keeps upper thread 8.Rotating shuttle cooperates with eedle 7 and the bottom line of drawing from shuttle sleeve is interwoven in upper thread 8.The upper thread 8 interweaved with bottom line lifts on needle plate 9, so Sewing machines 1 forms needle tracking on cloth by thread take-up tension lever 51.

The structure of thread clamping mechanism 100 is described with reference to Fig. 1 ~ Fig. 5.Thread clamping mechanism 100 comprises main tension disk 110 and secondary tension disk 130.Main tension disk 110 and secondary tension disk 130 are fixed on the frame of Sewing machines 1, and are exposed to the front surface of top ends 5.Main tension disk 110 and secondary tension disk 130 apply tension force to upper thread 8 respectively.Main tension disk 110 is positioned at the bottom of the front surface of top ends 5.Secondary tension disk 130 is positioned at the top of the front surface of top ends 5.Main tension disk 110 and secondary tension disk 130 are positioned at the upstream side of thread take-up tension lever 51 on the feed path of upper thread 8.The feed path of upper thread 8 is the paths supplying upper thread 8 from line cylinder 6 to eedle 7.Secondary tension disk 130 is positioned at the feed path upstream side of main tension disk 110.As shown in Figure 1, in feed path, from supply path upstream side, comprise cable guiding device 43, secondary tension disk 130, main tension disk 110, seton device 55, thread take-up tension lever 51, cable guiding device 56, cable guiding device 57 and cable guiding device 58 successively.Cable guiding device 43 is given prominence to upward at the upper surface in horn portion 4, guides the upper thread 8 of drawing from line cylinder 6 to secondary tension disk 130.Seton device 55 is positioned at the left of main tension disk 110.Seton device 55 guides the upper thread 8 after passing through from secondary tension disk 130 and main tension disk 110 to thread take-up tension lever 51.Cable guiding device 56 is positioned at the upper left side of main tension disk 110.Cable guiding device 57,58 is located at the bottom of shank 11.Cable guiding device 56 ~ cable guiding device 58 guides the upper thread 8 after passing through from thread take-up tension lever 51 to eedle 7.

As shown in Figure 4, Figure 5, main tension disk 110 mainly comprises clamp platform 111, clamp axle 112, first cable-clamping disc 113, second cable-clamping disc 114, thread take-up spring 115, platen 116, clamp spring 117, fixed component 118 and drive rod 119.Clamp platform 111 has axis hole 201 (with reference to Fig. 5) through along the longitudinal direction, the base of the drum of 208 (with reference to Fig. 8).Axis hole 201 is on the axle center of clamp platform 111.Axis hole 208 extends with the centerline axis parallel ground of the fore-and-aft direction of clamp platform 111.The position of axis hole 208 is from the axis deviation of clamp platform 111.Clamp platform 111 is screwed the frame in Sewing machines 1.Clamp platform 111 has groove 209 in front portion.Groove 209 extends diametrically along the periphery of clamp platform 111, and arrives axis hole 201.Clamp axle 112 is the axis bodies of the substantially cylindrical shape extended along the longitudinal direction.Clamp axle 112 thereafter end to be inserted in the axis hole 201 of clamp platform 111 and to be fixed with screw.The front end of clamp axle 112 is projected into the position on the front, front end than clamp platform 111.The axle center of clamp axle 112 has the axis hole 202 extended along the longitudinal direction.Clamp axle 112 is formed with external screw thread at front outer peripheral face, and has grooving in side.Grooving is formed near central authorities along the axle center of clamp axle 112 from front end.Grooving is connected with the axis hole 202 of clamp axle 112.Grooving can insert for the bridge part of platen 116.

First cable-clamping disc 113 is the metallic plate of plate-like, and its axle center has axis hole 206 through along the longitudinal direction.Clamp axle 112 runs through the axis hole 206 of the first cable-clamping disc 113.Second cable-clamping disc 114 is the metallic plate of plate-like, and its axle center has axis hole 207 through along the longitudinal direction.Clamp axle 112 runs through the axis hole 207 of the second cable-clamping disc 114.Second cable-clamping disc 114 is positioned at the front side of the first cable-clamping disc 113.First cable-clamping disc 113 and the second cable-clamping disc 114 configure to make respective plate face mode toward each other, and the direction warpage that respective periphery is separated toward each other.First cable-clamping disc 113 and the second cable-clamping disc 114 can rotate relative to clamp axle 112.Platen 116 is discoideus component, and its axle center has the axis hole extended along the longitudinal direction.The axis hole of platen 116 is a pair semi-circular shape, has banded bridge part between each axis hole.Clamp axle 112 runs through the axis hole of platen 116.Bridge part is positioned at the grooving of clamp axle 112.

Its end side of thread take-up spring 115 is fixed on clamp axle 112, and another side is passed through from the groove 209 being located at clamp platform 111.Thread take-up spring 115 swings with the movement of upper thread 8 under the effect of thread take-up tension lever 51.Thread take-up spring 115 comprises spire 203 (with reference to Fig. 5) and wire portion 205 (with reference to Fig. 4).Spire 203 is helical spring.Spire 203 overcoat is fixed on the periphery of the stem portion 204 of clamp axle 112, and is contained in clamp platform 111.Wire portion 205 is in the front of thread take-up spring 115.Wire portion 205 is projected into the outside of clamp platform 111 from the groove 209 of clamp platform 111.Thread take-up spring 115 has to clockwise active force when observing from front, can swing in the vertical direction.Clamp spring 117 is helical spring.The outer front without leave of clamp spring 117 is gone towards rear end side and becomes large.Clamp spring 117 is configured at the front side of platen 116, and is coated at clamp axle 112.Clamp spring 117 rearward pushes platen 116, thus exerts a force to clamp platform 111 side to the second cable-clamping disc 114 and the first cable-clamping disc 113.Fixed component 118 is the component of nut type.Fixed component 118 threadingly engages in the external screw thread of clamp axle 112.Fixed component 118 is by being screwed into the arbitrary position on fore-and-aft direction relative to clamp axle 112 and determining the position of the front end of clamp spring 117.Clamp spring 117 presses the power of the second cable-clamping disc 114 and the first cable-clamping disc 113 to change relative to the position of clamp axle 112 according to fixed component 118 to clamp platform 111 thruster.Drive rod 119 is bars that diameter is less than clamp axle 112.Drive rod 119 is inserted in the axis hole 202 of clamp axle 112 from the rear end of clamp platform 111.The front end of drive rod 119 abuts against with the bridge part of platen 116 in the axis hole 202 of clamp axle 112.The rear end of drive rod 119 is rearward given prominence to from the rear end of clamp platform 111.Upper thread 8 is clipped between the first cable-clamping disc 113 and the second cable-clamping disc 114 by main tension disk 110, correspondingly can apply tension force to upper thread 8 with the active force of clamp spring 117.Drive rod 119, when forwards moving along the axle center of clamp axle 112, reduces the active force of clamp spring 117 to the first cable-clamping disc 113 and the second cable-clamping disc 114.Therefore, main tension disk 110 can remove the tension force of upper thread 8.

Secondary tension disk 130 comprises clamp axle 132, first cable-clamping disc 133, second cable-clamping disc 134, cable guiding device 135, platen 136, clamp spring 137, fixed component 138, drive rod 139 and secondary spring 149.Secondary tension disk 130 utilizes the active force of clamp spring 137 to be clipped in by upper thread 8 between first cable-clamping disc 133 and the second cable-clamping disc 134, can apply tension force to upper thread 8.The structure of secondary tension disk 130 is roughly the same with the structure of main tension disk 110, therefore different structures is only described.Secondary tension disk 130 does not have clamp platform, and clamp axle 132 is fixed on the frame of Sewing machines 1 with screw.Secondary tension disk 130 does not have thread take-up spring.

Cable guiding device 135 is the board members extended along the vertical direction.Cable guiding device 135 is positioned at the rear of the first cable-clamping disc 133.The above-below direction both ends of cable guiding device 135 bend separately forward.Cable guiding device 135 has wire guide 146 at the kink 145 of upper end side, has wire guide 148 (with reference to Fig. 3) at the kink 147 of lower end side.Upper thread 8 after passing through from cable guiding device 43 (with reference to Fig. 1) is by wire guide 146.Upper thread 8 after passing through from wire guide 146 is by being directed into main tension disk 110 by wire guide 148 again between the first cable-clamping disc 133 and the second cable-clamping disc 134.

Secondary spring 149 is located between the first cable-clamping disc 133 and cable guiding device 135.Secondary spring 149 is helical spring.Secondary spring 149 is coated at clamp axle 132.Secondary spring 149 exerts a force to the second cable-clamping disc 134 side to the first cable-clamping disc 133.Relieve apply tension force by secondary tension disk 130 pairs of upper threads 8 time, having the faint power of secondary spring 149 from upper thread 8 effect passed through between the first cable-clamping disc 133 and the second cable-clamping disc 134.Therefore, secondary spring 149 suppresses upper thread 8 to come off from secondary tension disk 130.

With reference to Fig. 3 ~ Fig. 5, switching mechanism 150 is described.Switching mechanism 150 switches and applies tension force by main tension disk 110 and secondary tension disk 130 pairs of upper threads 8 (with reference to Fig. 1) and remove main folder line device 110 and secondary tension disk 130 pairs of upper threads 8 apply tension force.Switching mechanism 150 mainly comprises the first arm 160, force application component 170 (with reference to Fig. 3) and switching member 180.

The elongated plate body that first arm 160 extends when being and observing from front along the vertical direction.First arm 160 comprises main body 161, first cam part 162, second cam part 163, hook portion 164, protuberance 171 and engaging portion 175.Main body 161 is the positions of the plane tabular extended along the vertical direction.The above-below direction substantially central portion of support holes 165 (with reference to Fig. 5) through main body 161 along the longitudinal direction.Bolster 151 is fixed on the frame of Sewing machines 1, and is embedded in support holes 165.First arm 160 can be that fulcrum swings to first direction and the second direction contrary with first direction with bolster 151.The first direction of present embodiment is counter clockwise direction when observing from front, and second direction is clockwise direction when observing from front.

First cam part 162 is connected with the bottom of main body 161, and extends towards right.First cam part 162 bends in the longitudinal direction.First cam part 162 comprises plane 172, inclined-plane 166 and plane 167 at front surface.Plane 172 is mutually continuous with the bottom front surface of main body 161.Inclined-plane 166 is connected with the right-hand member of plane 172.Inclined-plane 166 tilts relative to plane 172.Inclined-plane 166 extends to right front.Plane 167 extends to the right from the right-hand member on inclined-plane 166.Plane 167 is almost parallel with plane 172.

Second cam part 163 is connected with the upper end of main body 161, and extends to the right.Second cam part 163 bends in the longitudinal direction.Second cam part 163 comprises plane 173, inclined-plane 168 and plane 169 at front surface.Plane 173 is mutually continuous with the upper front surface of main body 161.Inclined-plane 168 is connected with the right-hand member of plane 173.Inclined-plane 168 tilts relative to plane 173.Inclined-plane 168 extends towards right front.Plane 169 extends to the right from the right-hand member on inclined-plane 168.Plane 169 is almost parallel with plane 173.The right-hand member of hook portion 164 and the second cam part 163 is connected.Hook portion 164 is arranged by rearward being turned back by plate body.As shown in Figure 4, hook portion 164 is hook-shaped when left surface is observed, for tangling the anti-delinking part 198 of operating line 195 left end.Protuberance 171 is tabular positions that the above-below direction substantially central portion of main body 161 extends to the right.The right-hand member of protuberance 171 when observing from front in roughly semicircle shape.Engaging portion 175 is tabular positions that the downside of the above-below direction substantial middle of autonomous agent 161 is forwards given prominence to.One end of the locking force application component 170 of engaging portion 175.Force application component 170 (with reference to Fig. 3) is torsion spring.Force application component 170 is coated at bolster 151 in the front of the first arm 160.One end of force application component 170 is engaging in engaging portion 175.The other end of force application component 170 is engaging in the axle 97 (with reference to Fig. 9) of presser foot lifter spanner 96.Force application component 170 exerts a force to first direction to the first arm 160, makes the first arm 160 swing to usual position.Switching member 180 and the first arm 160 abut against, and switch and are applied tension force and remove to apply tension force by thread clamping mechanism 100 pairs of upper threads 8 by thread clamping mechanism 100 pairs of upper threads 8.Switching member 180 according to the position of the first arm 160 over there line 8 apply tension force and remove opposite line 8 to apply to switch between tension force.The position of the first arm 160 is the usual position that is positioned under the force effect of force application component 170 and the swing position after usual position swings to second direction.Switching member 180, when the first arm 160 is in usual position, applies tension force by main tension disk 110 pairs of upper threads 8, and releasing applies tension force by secondary tension disk 130 pairs of upper threads 8.Switching member 180, when the first arm 160 has swung more than first ormal weight to second direction from usual position, is removed and is applied tension force by main tension disk 110 pairs of upper threads 8, and applies tension force by secondary tension disk 130 pairs of upper threads 8.Switching member 180 comprises the first switching part 181 and the second switching part 182.First switching part 181 can switch by main tension disk 110 pairs of upper threads 8 apply tension force and remove apply tension force by main tension disk 110 pairs of upper threads 8.Second switching part 182 can switch by secondary tension disk 130 pairs of upper threads 8 apply tension force and remove apply tension force by secondary tension disk 130 pairs of upper threads 8.

First switching part 181 comprises switching pin 120, supporting plate 121, spacer pin 122 and force application component 123.Switching pin 120 is the components of the pole shape extended along the longitudinal direction.The rearward end 124 of switching pin 120 and the first arm 160 abut against.Rearward end 124 is in hemispherical.The front surface of the first cam part 162 of rearward end 124 and the first arm 160 abuts against.The retaining member being located at the frame of Sewing machines 1 mode of movement in front-rear direction can keep this switching pin 120 with switching pin 120.First cam part 162 of the first arm 160, when the first arm 160 has swung more than first ormal weight to second direction from usual position, pushes switching pin 120 and makes switching pin 120 mobile to the direction (front) of main tension disk 110.

Supporting plate 121 is board members of rounded shape when observing from front.The leading section 125 of switching pin 120 is inserted and is fixed on the rear surface of supporting plate 121.Leading section 125 abuts against by supporting plate 121 and the rearward end (the other end) of spacer pin 122 and the rearward end of drive rod 119 when switching pin 120 moves to the direction (front) of main tension disk 110.Spacer pin 122 extends along the longitudinal direction, runs through the axis hole 208 (with reference to Fig. 8) of clamp platform 111 inside abreast with clamp axle 112.Spacer pin 122 is when moving to main tension disk 110 side, and its front (end side) enters groove 209 and block the swing path of thread take-up spring 115.The rear end of spacer pin 122 and the front surface of supporting plate 121 abut against.The rear end of spacer pin 122 is exposed from the rear end of clamp platform 111.Force application component 123 is helical spring, between the rearward end and clamp platform 111 of spacer pin 122, be coated at spacer pin 122.Force application component 123 exerts a force to the side (rear) making the rear end of spacer pin 122 away from main tension disk 110 to the rear end of spacer pin 122.Second switching part 182 has switching pin 140.Switching pin 140 is the components of the pole shape extended along the longitudinal direction.The retaining member being located at the frame of Sewing machines 1 mode of movement in front-rear direction can keep this switching pin 140 with switching pin 140.The front surface 141 of switching pin 140 is in plane.Front surface 141 abuts against with the rear end of the drive rod 139 of secondary tension disk 130.The rearward end 142 of switching pin 140 is in hemispherical.Second cam part 163 of rearward end 142 and the first arm 160 abuts against.

With reference to Fig. 2, depression bar up-down mechanism 20 is described.Depression bar up-down mechanism 20 comprises depression bar 24, Pressure bar hoop 26, force application component 27 and knob 29.Depression bar 24 is bar-shaped in what extend along the vertical direction, can move up and down.The lower end of depression bar 24 is provided with presser feet 25 removably.Presser feet 25 can push down cloth from top.Pressure bar hoop 26 is the bar-shaped components extended along the longitudinal direction, is located at the above-below direction substantial middle part of depression bar 24.Pressure bar hoop 26 is screwed in depression bar 24.Force application component 27 is helical spring.Force application component 27 is coated at depression bar 24 above Pressure bar hoop 26.Force application component 27 exerts a force to depression bar 24 downwards by Pressure bar hoop 26.The active force of force application component 27 is greater than the active force of force application component 170.Knob 29 is located at the upper end of top ends 5.Knob 29 fixes the upper end of force application component 27.Depression bar up-down mechanism 20 carries out action according to the operation of driving mechanism 60 (with reference to Fig. 6).

With reference to Fig. 3, driving mechanism 185 is described.Driving mechanism 185 is connected with the first arm 160 of switching mechanism 150.During tangent line, driving mechanism 185 can overcome the active force of force application component 170 and make the first arm 160 swing the first ormal weight from usual position to second direction.Driving mechanism 185 operates switching member 180 by making the first arm 160 swing, thus is being applied tension force by thread clamping mechanism 100 pairs of upper threads 8 and removing to be applied to switch between tension force by thread clamping mechanism 100 pairs of upper threads 8.Driving mechanism 185 mainly comprises electromagnetic component 190, push rod 191, electromagnetic component bar 192, operating line 195 and sleeve pipe 197.Electromagnetic component 190 is the power sources making tangent mechanism 90 (with reference to Fig. 2) and switching mechanism 150 action.Push rod 191 extends to the right from electromagnetic component 190.Push rod 191 is connected with an end of electromagnetic component bar 192.Electromagnetic component bar 192 comprises axis hole 196, jut 193 and fixed part 194.Axis hole 196 is located at the front portion of electromagnetic component bar 192, is hole through along the vertical direction.Be fixed on the axis body 183 in support portion 2 (with reference to Fig. 1) through axis hole 196, and support this electromagnetic component bar 192 in the mode that electromagnetic component bar 192 can swing.Electromagnetic component 190 drives push rod 191, and electromagnetic component bar 192 is swung centered by axis body 183.Jut 193 is given prominence to the left from the fore-and-aft direction substantially central portion of electromagnetic component bar 192.Jut 193 transmits power when electromagnetic component bar 192 swings to tangent line bar axle.Tangent line bar axle makes tangential cam action, thus drives tangent mechanism 90.Fixed part 194 extends downwards from the rearward end of electromagnetic component bar 192.The other end of fixed part 194 fixing operation line 195.Operating line 195 passes in the sleeve pipe 197 be disposed in support portion 2, column sections 3 and horn portion 4.One end and the anti-delinking part 198 (with reference to Fig. 4) of operating line 195 are connected.Anti-delinking part 198 is stuck in the hook portion 164 of the first arm 160.

With reference to Fig. 6, Fig. 7, driving mechanism 60 is described.Driving mechanism 60 is connected with the first arm 160 of depression bar up-down mechanism 20 and switching mechanism 150.When the state down-pressed pole up-down mechanism 20 that driving mechanism 185 does not drive makes depression bar 24 rise, driving mechanism 60 can make the first arm 160 swing to second direction with the amount corresponding to the upper-lower position of depression bar 24.First arm 160 is greater than to the full swing amount that second direction swings the oscillating quantity (the first ormal weight) that the first arm 160 swings to second direction from usual position under the effect of driving mechanism 185 from usual position under the effect of driving mechanism 60.When depression bar up-down mechanism 20 makes depression bar 24 decline, driving mechanism 60 can make the first arm 160 swing to first direction with the amount corresponding to the upper-lower position of depression bar 24.Driving mechanism 60 comprises the second arm 61, adjustment part 77, abutting part 81, force application component 27, connecting rod 62, crank member 65, axle 66, bar component 68, knee operating mechanism 69 and knee action bars 70.

As shown in Figure 7, be board members of T-shaped when the second arm 61 is and observes from the back side.Second arm 61 is located at the rear of the first arm 160.Second arm 61 has the axis hole passed through for bolster 151.Second arm 61 can swing to first direction and second direction centered by bolster 151.Second arm 61 comprises extension 71, the extension 72 extended upward and the extension 73 extended to the right of confessing that the axis hole that bolster 151 passes through extends to the left.Extension 71 is connected with the Pressure bar hoop 26 of depression bar up-down mechanism 20 by plate 28.Plate 28 is the tabular components extended along the vertical direction, and its upper end utilizes connecting elements 74 to be connected with the left part of extension 71.The bottom of plate 28 has the opening 35 of substantially rectangular shape, and the rearward end 36 of Pressure bar hoop 26 is through opening 35.Extension 71 operates depression bar 24 by Pressure bar hoop 26.Force application component 27 exerts a force to the second arm 61 to first direction by plate 28.

Extension 72 overleaf upper right quarter screw 75 is connected with connecting rod 62.Extension 72 has shank 76 and abutting part 82 (with reference to Figure 16).Shank 76 forwards extends from the right part of extension 72.Shank 76 at the first arm 160 with the oscillating quantity being greater than the first ormal weight from usual position to after second direction swings, when depression bar up-down mechanism 20 makes depression bar 24 decline and the first arm 160 abut against, the first arm 160 is swung to first direction with the amount corresponding to the upper-lower position of depression bar 24.As shown in figure 16, abutting part 82 is positioned at the side contrary with thread clamping mechanism 100 relative to the first arm 160, abuts against with the face 174 (with reference to Fig. 4) by second that side of arm 61 of the first arm 160.Face 174 is faces of side contrary with the face by that side of thread clamping mechanism 100 in the face of the first arm 160.Abutting part 82 is positioned at the front upper left quarter of extension 72, roughly cylindric in what forwards give prominence to.Extension 73 overleaf right part screw 78 is fixed with adjustment part 77.Adjustment part 77 is the tabular components extended along the vertical direction.Adjustment part 77 has elongated hole 79.Elongated hole 79 is holes of above-below direction length.Elongated hole 79 can run through for the axle portion of screw 78.The head of screw 78 is located at the rearward end in the axle portion of screw 78.The diameter of the head of screw 78 is greater than the minor axis of elongated hole 79.The axle portion of screw 78 is anchored on the extension 73 of the second arm 61.Abutting part 81 is connected with the upper end of adjustment part 77, and the upper end of self-regulated whole 77 forwards extends.By screw 78 is anchored on extension 73 again through elongated hole 79, adjustment part 77 is assemblied in the second arm 61.Adjustment part 77 can adjust the above-below direction position of abutting part 81 relative to extension 73 in the scope of elongated hole 79.That is, adjustment part 77 can adjust the interval between abutting part 81 and the first arm 160.When extension 73 is fixed on through the upper end side of elongated hole 79 in adjustment part 77 by screw 78, if the second arm 61 swings to second direction, then abutting part 81 abuts with the upper end of the protuberance 171 of the first arm 160 and the first arm 160 is swung to second direction.When extension 73 is fixed on through the lower end side of elongated hole 79 in adjustment part 77 by screw 78, even if the second arm 61 swings to second direction, abutting part 81 does not also abut against with the first arm 160.

As shown in Figure 6, connecting rod 62 is the bar-shaped components extended in left-right direction in horn portion 4.Connecting rod 62 moves left and right linkedly with the operation of operator, thus operation depression bar up-down mechanism 20 and switching mechanism 150.Crank member 65 is located at the inside of column sections 3.Crank member 65 swings linkedly with the operation of operator, thus connecting rod 62 is moved left and right.Crank member 65 is tortuous sheet material.Axle 66 supports the meanders of this crank member 65 in the mode that crank member 65 can swing.The meanders that crank member 65 supports from axle 66 extends with below to the right.Connecting rod 62 is connected with the lower end of the part extended downwards of crank member 65.The right-hand member of crank member 65 is connected with the upper end of bar component 68.Bar component 68 in column sections 3 on downward-extension.Support portion 2 has knee operating mechanism 69 in inside.The lower end of bar component 68 is connected with knee operating mechanism 69.Knee operating mechanism 69 is connected with knee action bars 70.Knee action bars 70 is board members of rounded shape when left surface is observed, operates for operator.Operator operates knee action bars 70 with knee, and knee operating mechanism 69 is swung.Bar component 68 moves up and down when knee operating mechanism 69 swings.

With reference to Fig. 9, Figure 10, interlinked mechanism 95 is described.Interlinked mechanism 95 is connected with switching mechanism 150 and driving mechanism 60.When the state down-pressed pole up-down mechanism 20 that driving mechanism 185 does not drive makes depression bar 24 rise, interlinked mechanism 95 can make the first arm 160 swing to second direction with the amount corresponding to the upper-lower position of depression bar 24.The full swing amount that first arm 160 swings to second direction from usual position under the effect of interlinked mechanism 95 is roughly the same with the oscillating quantity (the first ormal weight) that the first arm 160 swings to second direction from usual position under the effect of driving mechanism 185.Interlinked mechanism 95 comprises presser foot lifter spanner 96, axle 97 and cam 98.

The left back of the second arm 61 is located at by presser foot lifter spanner 96, and is positioned at the outside of top ends 5.Presser foot lifter spanner 96 at one end portion is fixed with axle 97.Axle 97 forwards extends from an end of presser foot lifter spanner 96.Presser foot lifter spanner 96 and axle 97 extend orthogonally.Axle 97 is rotatably supported on the frame of Sewing machines 1.Presser foot lifter spanner 96 can swing centered by axle 97.The other end of the locking force application component 170 in front end of axle 97.Cam 98 is located at the fore-and-aft direction middle body of axle 97.Cam 98 has thickness in the longitudinal direction.Cam 98 is radially given prominence to from axle 97.Cam 98 swings centered by axle 97 with the swing of presser foot lifter spanner 96.The right flank of cam 98 can engage with the left surface of the extension 72 of the left surface of the main body 161 of the first arm 160 and the second arm 61.

The position of the presser foot lifter spanner 96 shown in Fig. 9 is usual position, and the right flank of cam 98 does not act on the left surface of main body 161 and the left surface of extension 72.When presser foot lifter spanner 96 swings around counter clockwise direction when observing from the back side centered by axle 97, cam 98 swings around counter clockwise direction when observing from the back side centered by axle 97.When cam 98 swings, below is mobile left for the right flank of cam 98, pushes the left surface of main body 161 and the left surface of extension 72 to the right.First arm 160 and the second arm 61 swing to second direction centered by bolster 151.The position of the presser foot lifter spanner 96 shown in Figure 10 is the positions having been swung full swing amount by interlinked mechanism 95 from usual position to second direction.Cam 98, when adjustment part 77 have adjusted the interval between abutting part 81 and the first arm 160, also can push the left surface of main body 161 and the left surface of extension 72 to the right.

As shown in Figure 9, Figure 10, fulcrum post 83,84 arranges the rear being located at the first arm 160 in the vertical direction.Fulcrum post 83,84 is positioned at the side contrary with thread clamping mechanism 100 relative to the first arm 160.The face 174 (with reference to Fig. 4) by second that side of arm 61 of fulcrum post 83,84 and first arm 160 abuts against.Fulcrum post 83,84 through be formed at top ends 5 rear surface hole and be fixed.Fulcrum post 83,84, when the first arm 160 is subject to the rearward power from switching pin 120,140, prevents the first arm 160 from rearward moving.Therefore, Sewing machines 1 can utilize fulcrum post 83,84 to prevent the first arm 160 when swinging to first direction or second direction etc. to twist.

The action of driving mechanism 185, switching mechanism 150 and thread clamping mechanism 100 when tangent line is described.The usual position of switching mechanism 150 is the position shown in Figure 11.The main body 161 of the first arm 160 extends along roughly vertical direction in usual position.The hook portion 164 of the first arm 160 makes anti-delinking part 198 move to leftmost in usual position under the effect of force application component 170 (with reference to Fig. 4).When anti-delinking part 198 moves to leftmost, push rod 191 is externally projected at utmost from electromagnetic component 190.The upper end of protuberance 171 and the lower end of abutting part 81 abut against.Main body 161 is in from the left surface of shank 76 position spaced apart.Position near the rearward end 124 of switching pin 120 and the boundary on plane 172 and inclined-plane 166 abuts against.Rearward end 142 and the plane 169 of switching pin 140 abut against.Switching mechanism 150 is in when lowermost position is put at presser feet 25 and is in usual position.When making or not during tangent line, presser feet 25 is in lowermost position and puts.

After sewing finishing, Sewing machines 1 inputs tangent line signal.Electromagnetic component 190 shown in Fig. 3 is driven according to the input of tangent line signal, push rod 191 is drawn in the inside of electromagnetic component 190.Electromagnetic component bar 192 centered by axis body 183 to electromagnetic component 190 side oscillation.Fixed part 194 moves to electromagnetic component 190 side, drags operating line 195 to electromagnetic component 190 layback.Operating line 195 transmits the driving force of electromagnetic component 190 to switching mechanism 150.

Anti-delinking part 198 (with reference to Fig. 5) is moved to the right when electromagnetic component 190 pulls operating line 195.Anti-delinking part 198 pushes the hook portion 164 of the first arm 160 to the right.First arm 160 is that fulcrum swings around clockwise direction when observing from front with bolster 151.Even if main body 161 does not also abut against with the shank 76 of the second arm 61 when the first arm 160 swings.First cam part 162 moves for fulcrum with bolster 151 to the left with the swing of the first arm 160.As shown in figure 12, the position near the rearward end 124 of switching pin 120 and the boundary of inclined-plane 166 and plane 167 abuts against.Switching pin 120 forwards moves.

As shown in figure 13, supporting plate 121, spacer pin 122 overcome the active force of force application component 123 and move to main tension disk 110 side (front).Spacer pin 122 transverse slot 209.Spacer pin 122 blocks the swing path of the wire portion 205 of thread take-up spring 115.Spacer pin 122 limits the swing of wire portion 205.Switching pin 120 abuts against by supporting plate 121 and drive rod 119 with movement forwards.Supporting plate 121 forwards pushes drive rod 119.Drive rod 119 pushes platen 116.Platen 116 overcomes the active force of clamp spring 117 and forwards pushes clamp spring 117.The power that second cable-clamping disc 114 rearward pushes the first cable-clamping disc 113 reduces.The tension force that main tension disk 110 pairs of upper threads 8 apply is removed.First cam part 162 to the first arm 160 forwards pushes switching pin 120 when being in usual position more energetically.Switching pin 120 to the first arm 160 rearward pushes the first cam part 162 when being in usual position more energetically.The abutting part 82 of the second arm 61 is connected to the face 174 of the first arm 160 and supports the first arm 160.

Second cam part 163 moves for fulcrum with bolster 151 to the right with the swing of the first arm 160.As shown in figure 12, the position near the rearward end 142 of switching pin 140 and the boundary of inclined-plane 168 and plane 173 abuts against.First arm 160 reduces with the pushing force comparing switching pin 140 when being in usual position.The power that drive rod 139 pushes platen 136 reduces.Clamp spring 137 rearward exerts a force to platen 136.Therefore, secondary tension disk 130 utilizes the active force of clamp spring 137 to be clipped in by upper thread 8 between first cable-clamping disc 133 and the second cable-clamping disc 134, applies tension force to upper thread 8.

Remove according to the input of tangent line signal the tension force that main tension disk 110 pairs of upper threads 8 apply time the confidential opportunity applying tension force early than secondary tension disk 130 pairs of upper threads 8.Now, thread take-up tension lever 51 moves downwards, is in before starting to lift upper thread 8.

After tangent line, push rod 191 is released the outside of electromagnetic component 190 by electromagnetic component 190.Electromagnetic component bar 192 centered by axis body 183 to the side oscillation away from electromagnetic component 190.Fixed part 194 moves to the side away from electromagnetic component 190, thus promotes operating line 195 to the side away from electromagnetic component 190.When electromagnetic component 190 promotes operating line 195, to be fulcrum with bolster 151 under the effect of the active force of force application component 170 swing around counter clockwise direction when observing from front the first arm 160.Hook portion 164 and anti-delinking part 198 together move to leftmost, and the first arm 160 turns back to usual position.

The action of the driving mechanism 60 when presser feet 25 is elevated, switching mechanism 150 and thread clamping mechanism 100 is described.Switching mechanism 150 is in when lowermost position is put at presser feet 25 and is in the usual position shown in Figure 11.Presser feet 25 be in lowermost position put time, operator does not operate the knee action bars 70 of driving mechanism 60.Second arm 61 of driving mechanism 60 is in when lowermost position is put at presser feet 25 and is in the usual position shown in Fig. 7, Figure 11.

When operator pushes knee action bars 70 to the right, knee operating mechanism 69 swings around counter clockwise direction when observing from front with the amount corresponding to the operational ton of knee action bars 70.Bar component 68 is moved upward with the swing of knee operating mechanism 69.Crank member 65 swings around clockwise direction when observing from the back side centered by axle 66 with bar component 68 is moved upward.Connecting rod 62 moves with the amount corresponding to the operational ton of knee action bars 70 to the right with the swing of crank member 65.Second arm 61 swings around counter clockwise direction when observing from the back side centered by bolster 151 with connecting rod 62 moves to the right.The oscillating quantity of the second arm 61 is amounts corresponding to the amount of movement of connecting rod 62.Extension 71 is moved upward with the amount corresponding to the oscillating quantity of the second arm 61, pushes Pressure bar hoop 26 upward by plate 28.Depression bar 24 and Pressure bar hoop 26 are together moved upward.Therefore, presser feet 25 is moved upward with the amount corresponding to the operational ton of knee action bars 70.Below is mobile left with the amount corresponding to the oscillating quantity of the second arm 61 for extension 73 shown in Fig. 7.Now, the abutting part 81 of extension 73 and the protuberance 171 of the first arm 160 abut against, and below is mobile left to make protuberance 171.The rigging position depending on adjustment part 77 opportunity that abutting part 81 and protuberance 171 abut.After abutting part 81 and protuberance 171 abut, the first arm 160 swings around clockwise direction when observing from front together with the second arm 61 centered by bolster 151.

As shown in figure 14, presser feet 25 be in put the position rising the second ormal weight from lowermost position time, the first arm 160 is in the position identical with Figure 12.Therefore, the tension force that main tension disk 110 pairs of upper threads 8 apply is removed.Secondary tension disk 130 pairs of upper threads 8 apply tension force.When presser feet 25 is in uppermost position in fig-ure, the first arm 160 is in the position (with reference to Figure 15) after the posture shown in Figure 14 swings around the clockwise direction when front is observed further.Uppermost position in fig-ure to put also top position, the position that rises the second ormal weight from lowermost position than presser feet 25.As shown in figure 15, the first cam part 162 moves for fulcrum with bolster 151 to the left with the swing of the first arm 160.Rearward end 124 and the plane 167 of switching pin 120 abut against.Plane 167 forwards pushes switching pin 120.Switching pin 120 also will forwards move than during the position be in shown in Figure 14.Supporting plate 121, spacer pin 122 also will forwards move than during the position be in shown in Figure 14.Spacer pin 122 transverse slot 209.Spacer pin 122 is retreated according to the amount of movement of supporting plate 121.Spacer pin 122 blocks the swing path of the wire portion 205 of thread take-up spring 115.Supporting plate 121 forwards pushes the drive rod 119 of main tension disk 110.Drive rod 119 pushes platen 116.The active force that platen 116 overcomes clamp spring 117 forwards pushes clamp spring 117.The power that second cable-clamping disc 114 rearward pushes the first cable-clamping disc 113 reduces.The tension force that main tension disk 110 pairs of upper threads 8 apply is removed.Second cam part 163 moves for fulcrum with bolster 151 to the right with the swing of the first arm 160.Rearward end 142 and the plane 173 of switching pin 140 abut against.First arm 160 reduces with the pushing force comparing switching pin 140 when being in usual position.The power that drive rod 139 pushes platen 136 reduces.Clamp spring 137 rearward exerts a force to platen 136.Therefore, secondary tension disk 130 utilizes the active force of clamp spring 137 to be clipped in by upper thread 8 between first cable-clamping disc 133 and the second cable-clamping disc 134, applies tension force to upper thread 8.

When operator removes the operation of knee action bars 70, knee operating mechanism 69 swings around clockwise direction when observing from front.When knee operating mechanism 69 swings around clockwise direction when observing from front, bar component 68 moves downwards.Crank member 65 swings around clockwise direction when observing from front centered by axle 66 with bar component 68 moves downwards.Connecting rod 62 moves to the left with the swing of crank member 65.Force application component 27 pushes Pressure bar hoop 26 downwards.Force application component 27 exerts a force to the second arm 61 to first direction by plate 28.Second arm 61 swings around counter clockwise direction when observing from front under the effect of the active force of force application component 27 with connecting rod 62 moves to the left centered by bolster 151.Depression bar 24 and Pressure bar hoop 26 together move downwards.Therefore, presser feet 25 moves downwards.

When presser feet 25 is put mobile from uppermost position in fig-ure to lowermost position, the second arm 61 turns back to usual position around counter clockwise direction when observing from front swings under the effect of the active force of force application component 27.After the second arm 61 starts to swing around counter clockwise direction when observing from front, the first arm 160 does not only sometimes turn back to the usual position shown in Figure 11 under the effect of the active force of force application component 170.Such as, when presser feet 25 is in uppermost position in fig-ure, when switching pin 120 to the first arm 160 is in usual position, rearward push the first cam part 162 more energetically.Therefore, be difficult to swing to first direction compared with when the first arm 160 and the position be in apart from usual location comparison is near.Now, as shown in figure 16, the shank 76 of the second arm 61 is turning back in the process of usual position abutting against with the right-hand member of main body 161 around counter clockwise direction when observing from front swings.The active force of force application component 27 is greater than the active force of force application component 170.Therefore, shank 76, after abutting against with main body 161, pushes main body 161 to counter clockwise direction when observing from front.Therefore, the first arm 160 is subject to the active force of the force application component 27 that the second arm 61 is swung, and therefore turns back to usual position around counter clockwise direction when observing from front swings together with the second arm 61.

Depression bar 24, depression bar up-down mechanism 20, thread take-up tension lever 51 are an example of depression bar of the present utility model, up-down mechanism, thread take-up tension lever respectively.Main tension disk 110, secondary tension disk 130 are an example of the first tension disk of the present utility model, the second tension disk respectively.Clamp axle 112, clamp platform 111, drive rod 119, thread take-up spring 115, clamp spring 117 are an example of clamp axle of the present utility model, clamp platform, drive rod, thread take-up spring, the 3rd force application component respectively.First cable-clamping disc 113 and the second cable-clamping disc 114 are examples for a pair cable-clamping disc of the present utility model.Switching mechanism 150, first arm 160, force application component 170, switching member 180 are an example of switching mechanism of the present utility model, the first arm, the first force application component, switching member respectively.Spacer pin 122, force application component 123, switching pin 120 are an example of spacer pin of the present utility model, the 4th force application component, switching pin respectively.Driving mechanism 185 is examples for the first driving mechanism of the present utility model.Driving mechanism 60, second arm 61, force application component 27, shank 76, abutting part 81, adjustment part 77, abutting part 82 are an example of the second driving mechanism of the present utility model, the second arm, the second force application component, shank, the first abutting part, adjustment part, the second abutting part respectively.

The force application component 170 (with reference to Fig. 3) of Sewing machines 1 exerts a force to first direction (counter clockwise direction when observing from front) to the first arm 160.First arm 160 is in usual position when not being subject to the power of self-driven mechanism 60,185.When depression bar up-down mechanism 20 makes depression bar 24 decline, the first arm 160 swings to first direction under the effect of the active force of the force application component 27 of force application component 170 and driving mechanism 60.Therefore, the first arm 160 stably turns back to usual position than during the power be only subject to from force application component 170.That is, Sewing machines 1 can stably perform tension force switching action than ever.Adjustment part 77 (with reference to Fig. 7) can adjust the opportunity that abutting part 81 and the first arm 160 abut against.That is, Sewing machines 1 can be applied tension force and remove to apply tension force by thread clamping mechanism 100 pairs of upper threads 8 by thread clamping mechanism 100 pairs of upper threads 8 according to the position switching on the above-below direction of presser feet 25.When operator makes the first arm 160 swing more than first ormal weight by the knee action bars 70 of operation driving mechanism 60, the first arm 160 does not turn back to usual position because of the power from switching member 180 (with reference to Fig. 4) sometimes.Sewing machines 1 is owing to having shank 76, and therefore, the first arm 160 also can stably turn back to usual position when having swung more than first ormal weight.That is, Sewing machines 1 can stably perform tension force switching action than ever.Sewing machines 1, owing to having the so fairly simple structure of shank 76, therefore can not cause price significantly to rise.Such as, when improving the stability of tension force switching action at the active force by increasing force application component 170, the load that operator pushes needed for knee action bars 70 to the right increases.Sewing machines 1 swings, therefore, it is possible to improve the stability of tension force switching action when not increasing the active force of force application component 170 to first direction because the first arm 160 is subject to the power from force application component 170 and driving mechanism 60.Therefore, Sewing machines 1 can stably perform tension force switching action when not impairing operability when operator pushes knee action bars 70 to the right.

When making, main tension disk 110 pairs of upper threads 8 apply tension force, and the tension force that secondary tension disk 130 pairs of upper threads 8 apply is removed.Upper thread 8 can independently obtain suitable tension force and form needle tracking with bottom line by tension disk 110.When tangent line or when making presser feet increase, switching member 180 is applied tension force to being applied tension force by main tension disk 110, secondary tension disk 130 pairs of upper threads 8 and removing switched by main tension disk 110, secondary tension disk 130 pairs of upper thread 8 respectively.Now, the tension force that main tension disk 110 pairs of upper threads 8 apply is removed, and secondary tension disk 130 pairs of upper threads 8 apply tension force.When tangent line, Sewing machines 1 can obtain suitable tension force from secondary tension disk 130 and cut off upper thread 8.When making presser feet 25 rise, Sewing machines 1 can maintain suitable tension force from secondary tension disk 130.Therefore, Sewing machines 1 suitably can use main tension disk 110 and secondary tension disk 130, and switches the tension force acting on upper thread 8.When making the first arm 160 swing more than first ormal weight to second direction from usual position, spacer pin 122 blocks the swing path of thread take-up spring 115.Spacer pin 122, regardless of the positioning precision of clamp platform 111 relative to the rigging position of Sewing machines 1, can both block the swing path of thread take-up spring 115.That is, the free degree of the rigging position of clamp platform 111 is higher.The face 174 of the first arm 160 abuts against with the abutting part 82 of driving mechanism 60.When the first arm 160 to be subject to the rearward power from main tension disk 110 and secondary tension disk 130 via switching pin 120,140, abutting part 82 prevent the first arm 160 rearward (the second arm 61 side) mobile.Therefore, Sewing machines 1 can utilize abutting part 82 to prevent the first arm 160 when swinging to first direction or second direction etc. to twist.

The utility model is not limited to above-mentioned embodiment, and such as, the quantity of the tension disk that Sewing machines possesses is more than one.When Sewing machines has multiple tension disk, as long as each tension disk is configured in the upstream side of thread take-up tension lever on the feed path of upper thread.As long as tension disk can apply tension force to upper thread 8, also can be other structures.Being applied tension force and remove to apply tension force by tension disk to upper thread to upper thread by tension disk as long as switching mechanism can switch, also can be other structures.

As long as driving mechanism 185 is connected with the first arm 160 of switching mechanism 150, making the first arm 160 swing the first ormal weight from usual position to second direction when tangent line, also can be other structures.Such as, force application component 170 also can be helical spring.Switching member 180 also can not have spacer pin 122 and force application component 123.Such as, also can replace operating line 195, be connected with the push rod 191 of the component such as connecting rod or rod member and electromagnetic component 190.Such as, the driver drives switching mechanism 150 cylinder, motor etc. also can being used different from electromagnetic component 190.Usual position, first direction, second direction, ormal weight (the first ormal weight, the second ormal weight) all can suitably change.

As long as when depression bar up-down mechanism 20 makes depression bar 24 rise, driving mechanism 60 makes the first arm 160 swing to second direction with the amount corresponding to the upper-lower position of depression bar 24 from usual position, and, when depression bar up-down mechanism 20 makes depression bar 24 decline, driving mechanism 60 makes the first arm 160 swing to first direction with the amount corresponding to the upper-lower position of depression bar 24, also can be other structures.Such as, adjustment part 77 can be omitted.Configuration, the shape of shank 76 can suitably change.Driving mechanism 60 also can carry out the cylinder, motor, electromagnetic component etc. that drive for power source and drive with the operation according to operating portion.

Claims

1. a Sewing machines, it comprises:

Depression bar, it can load and unload the presser feet for pushing down cloth;

Up-down mechanism, it can make above-mentioned depression bar move up and down;

Thread take-up tension lever, it moves up and down along with the rotation of main shaft;

Tension disk, it is positioned at the upstream side of above-mentioned thread take-up tension lever on the feed path of upper thread, can apply tension force to upper thread; And

Switching mechanism, its can switch by above-mentioned tension disk to upper thread apply tension force and remove by above-mentioned tension disk, tension force is applied to upper thread;

Above-mentioned switching mechanism comprises:

First arm, it extends along the vertical direction, can be fulcrum with bolster and swing to first direction and the second direction contrary with above-mentioned first direction;

First force application component, it makes above-mentioned first arm swing to usual position to above-mentioned first direction to above-mentioned first arm force; And

Switching member, itself and above-mentioned first arm abut against, by above-mentioned tension disk tension force applied to upper thread or removing the state by above-mentioned tension disk, upper thread being applied to tension force when above-mentioned first arm is in usual position is switched according to the swing position of above-mentioned first arm after usual position swings to above-mentioned second direction

The feature of this Sewing machines is,

This Sewing machines comprises:

First driving mechanism, it is connected with above-mentioned first arm, and when tangent line, this first driving mechanism makes above-mentioned first arm overcome the active force of above-mentioned first force application component and swing ormal weight from usual position to above-mentioned second direction thus operate above-mentioned switching member; And

Second driving mechanism, it is connected with above-mentioned up-down mechanism and above-mentioned first arm, when above-mentioned up-down mechanism makes above-mentioned depression bar rise, this second driving mechanism makes above-mentioned first arm swing to above-mentioned second direction with the amount corresponding to the upper-lower position of above-mentioned depression bar from usual position, when above-mentioned up-down mechanism makes above-mentioned depression bar decline, this second driving mechanism makes above-mentioned first arm swing to above-mentioned first direction with the amount corresponding to the upper-lower position of above-mentioned depression bar;

Above-mentioned first arm has to the outstanding protuberance in the direction orthogonal with the bearing of trend of above-mentioned first arm;

The full swing amount that above-mentioned first arm swings to above-mentioned second direction from usual position under the effect of above-mentioned second driving mechanism is greater than the oscillating quantity that above-mentioned first arm swings to above-mentioned second direction from usual position under the effect of above-mentioned first driving mechanism;

Above-mentioned second driving mechanism comprises:

Second arm, it is connected with above-mentioned up-down mechanism and extends along the vertical direction, can with above-mentioned bolster for fulcrum swings to above-mentioned first direction and above-mentioned second direction;

Second force application component, it exerts a force to above-mentioned first direction to above-mentioned second arm;

First abutting part, it is configured at than the position of above-mentioned protuberance by above-mentioned first direction side, and extends to above-mentioned first arm side from above-mentioned second arm; And

Shank, it is configured at than the position of above-mentioned first arm by above-mentioned second direction side, and extends to above-mentioned first arm side from above-mentioned second arm;

Above-mentioned first abutting part can abut against with above-mentioned first arm when above-mentioned second arm overcomes the active force of above-mentioned second force application component and swings to above-mentioned second direction;

Above-mentioned shank when above-mentioned first abutting part and above-mentioned first arm abut against away from above-mentioned first arm, further, above-mentioned shank can abut against with above-mentioned first arm when above-mentioned second arm swings to above-mentioned first direction from the state that above-mentioned first abutting part abuts with above-mentioned first arm.

2. Sewing machines according to claim 1, is characterized in that,

Above-mentioned second driving mechanism comprises adjustment part, and this adjustment part is connected with above-mentioned first abutting part and extends along the vertical direction, can be assemblied in above-mentioned second arm;

Above-mentioned adjustment part has the long elongated hole of above-below direction;

The above-below direction position of above-mentioned first abutting part relative to above-mentioned second arm can be changed by above-mentioned adjustment part being assemblied in above-mentioned second arm in the scope of above-mentioned elongated hole.

3. Sewing machines according to claim 1, is characterized in that,

Above-mentioned second force application component is helical spring, and exerts a force to above-mentioned depression bar downwards;

Above-mentioned second force application component to above-mentioned first direction to above-mentioned second arm apply active force be greater than above-mentioned first force application component to above-mentioned first direction to above-mentioned first arm apply active force.

4. Sewing machines according to claim 2, is characterized in that,

5. the Sewing machines according to any one of Claims 1 to 4, is characterized in that,

Above-mentioned tension disk comprises:

First tension disk, it can apply tension force to upper thread; And

Second tension disk, it can apply tension force to upper thread, and is in than the position of above-mentioned first tension disk by above-mentioned feed path upstream side;

Above-mentioned switching member, when above-mentioned first arm is in usual position, makes to apply tension force by above-mentioned first tension disk to upper thread, and releasing applies tension force by above-mentioned second tension disk to upper thread; Above-mentioned switching member, when above-mentioned first arm has swung more than afore mentioned rules amount to above-mentioned second direction from usual position, makes to remove applying tension force by above-mentioned first tension disk to upper thread, and applies tension force by above-mentioned second tension disk to upper thread.

6. Sewing machines according to claim 5, is characterized in that,

Above-mentioned first tension disk comprises:

Clamp axle;

Clamp platform, is inserted with the end side of above-mentioned clamp axle within it;

A pair cable-clamping disc, it is supported on another side of above-mentioned clamp axle, can clip upper thread and apply tension force to upper thread;

3rd force application component, it is coated at the position of above-mentioned a pair cable-clamping disc of ratio by another side of above-mentioned clamp axle, to above-mentioned clamp platform side to above-mentioned a pair cable-clamping disc force;

Drive rod, it is inserted into the inside of above-mentioned clamp axle, this drive rod, when moving along the axle center of above-mentioned clamp axle to the direction of the other end of above-mentioned clamp axle, reduces above-mentioned 3rd force application component can remove the upper thread clamped by above-mentioned a pair cable-clamping disc tension force to the active force of above-mentioned a pair cable-clamping disc; And

Thread take-up spring, its end side is fixed on above-mentioned clamp axle, and another side is passed through from the groove being located at above-mentioned clamp platform, swings with the movement of upper thread under the effect of above-mentioned thread take-up tension lever;

Above-mentioned switching member comprises:

Spacer pin, itself and above-mentioned clamp axle are abreast through the inside of above-mentioned clamp platform, and when this spacer pin moves to above-mentioned first tension disk side, its end side can block the swing path of above-mentioned thread take-up spring;

4th force application component, it exerts a force to the side making above-mentioned spacer pin away from above-mentioned first tension disk to another side of above-mentioned spacer pin; And

Switching pin, itself and above-mentioned spacer pin extend abreast, one end and above-mentioned first arm of this switching pin abut against, and when this switching pin moves to the direction of above-mentioned first tension disk, its other end can abut against with the other end of above-mentioned spacer pin and above-mentioned drive rod;

When above-mentioned first arm has swung more than afore mentioned rules amount to above-mentioned second direction from usual position, above-mentioned switching pin moves to the direction of above-mentioned first tension disk, above-mentioned switching pin and above-mentioned drive rod abut against and above-mentioned drive rod are moved to above-mentioned first tension disk side, above-mentioned drive rod reduces above-mentioned 3rd force application component removes the upper thread clamped by above-mentioned a pair cable-clamping disc tension force to the active force of above-mentioned a pair cable-clamping disc, and, above-mentioned spacer pin overcomes the active force of above-mentioned 4th force application component and moves to above-mentioned first tension disk side and block the swing path of above-mentioned thread take-up spring.

7. Sewing machines according to claim 5, is characterized in that,

Above-mentioned second arm comprises the second abutting part, and this second abutting part is positioned at the side contrary with above-mentioned tension disk relative to above-mentioned first arm, and abuts against with the face by above-mentioned second that side of arm of above-mentioned first arm.

8. Sewing machines according to claim 6, is characterized in that,