CN201158747Y

CN201158747Y - Lower thread cutter of sewing machine

Info

Publication number: CN201158747Y
Application number: CNU2007201862631U
Authority: CN
Inventors: 顾飞龙
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-12-28
Filing date: 2007-12-28
Publication date: 2008-12-03
Anticipated expiration: 2017-12-28

Abstract

The utility model relates to a lower thread cutter of a sewing machine, which comprises a fixed plate, a lower mounting plate, a slide guide sheet and a connected rocker, wherein the fixed plate is fixed on the bed station of the sewing machine, and is provided with an inclined guide slot and a first guide element in order to respectively and relatively assemble and hold a second guide element and a guide hole of the lower mounting plate, and the upper surface and the lower surface of the lower mounting plate are respectively assembled with a fixed cutting knife group and a clip group, a third guide element is arranged on the lower mounting plate, and is relatively penetrated on an elongated chute on the slide guide sheet, a thread drawing rod is assembled on the slide guide sheet, and the front end of the slide guide sheet is limited through being clamped by the fixed cutting knife group, rectangle holes are further arranged on the slide guide sheet for relatively holding a fourth guide element on the connected rocker, and the middle portion of the connected rocker is pivoted with the fixed plate. Thus a lower thread cutter group can shorten the distance from the fixed cutting knife group to a closing thread in the thread cutting operation, thereby relatively shortening thread tail length left on cloth after being finished the thread cutting operation.

Description

The lower thread cutter of Sewing machines

Technical field

The lower thread cutter of the relevant a kind of Sewing machines of the utility model.

Background technology

The lower thread cutter of existing sewing machine has a fixed head, this fixed head is to fix with the bed platform of Sewing machines, and for line shearing group assembling location, this line shearing group has an installing plate, this installing plate is fixed on the fixed head, and group is established a sliding guide plate on the installing plate, and the front end of this sliding guide plate is provided with a moving cutting tool, this installing plate, sliding guide plate and moving cutting tool and a linking swing arm interlock again, and this linking swing arm is driven by electromagnetic valve and swings.Like this, when the start of solenoid-driven linking swing arm, this linking swing arm will drive the action that installing plate, sliding guide plate and moving cutting tool are done beat, moved, collude line and tangent line.

Yet, this existing lower thread cutter structure is when carrying out the trimming operation, all only first whole lower installation board of drive of its linking swing arm and sliding guide plate are done the beat action on the angle, when linking swing arm continues by interlock, just sliding guide plate can be released fully, and the collude line bar of interlock on it protrudes out to collude the line action, because the fixed cutting tool group and the intermediate plate group of this lower thread cutter are to be fixed on the lower installation board, and this lower installation board is only done low-angle beat action in whole tangent line operation process, therefore the whole stroke that colludes line that protrudes out that colludes the line bar is longer, be that the fixed cutting tool group is longer to the distance of suture position, make and after cutting off suture, stay the thread end length on cloth longer relatively, this not only causes the situation of waste suture, and for the sophistication of asking commodity must increase and make cost of processing on foot again manually to carry out the operation of cutting out of line tail.

Please refer to No. the 84205229th, TaiWan, China patent and No. 86218218, it is the novel patent case of the relevant thread cutting device of the utility model people institute utility model, and above-mentioned two patent cases all have the aforesaid disadvantages associated of staying on cloth such as the relative length of thread end length after cutting off suture.

The utility model content

The purpose of this utility model provides a kind of lower thread cutter of Sewing machines, and it stays the thread end length on cloth to shorten relatively after cutting off suture.For achieving the above object, the lower thread cutter of Sewing machines of the present utility model is characterized in comprising: a fixed head, and it is fixedly arranged on the bed platform of Sewing machines, is provided with inclined guide groove in first end of fixed head, and establishes first guide member in this end; One lower installation board, the above and below of its front end is respectively equipped with fixed cutting tool group and intermediate plate group, and establish second guide member at this end, and correspondence is placed in the aforesaid inclined guide groove, guide hole is established in rear end at lower installation board, be provided with for described first guide member is corresponding, and establish the 3rd guide member in a side of guide channel; One sliding guide plate, its front end are equipped with and collude the line bar, and establish an elongated hole longitudinally at the rear of colluding assembling place of line bar, and the rear of elongated hole establishes a horizontal microscler chute, and be ccontaining for described the 3rd guide member correspondence; One linking swing arm, its first end is convexly equipped with the 4th guide member, and correspondence convexedly stretches in the described elongated hole, and its second end and electromagnetic valve are connected with, and are pivoted with fixed head in the place, centre.

This time line shearing group is when carrying out the trimming operation, this linking swing arm will drive lower installation board and sliding guide plate beat and displacement simultaneously, make the fixed cutting tool group of being located at lower installation board, intermediate plate group and be located at the action that the line bar is also done angle beat and displacement simultaneously of colluding of sliding guide plate, linking swing arm interlock sliding guide plate displacement separately to the primary importance, make the line bar that colludes on it protrude out and collude line action, and under the interlock of follow-up linking swing arm, suture is colluded the fixed cutting tool group of locating the primary importance place to the position and finish the trimming operation, reach to utilize and shorten this fixed cutting tool group to colluding the distance of establishing the suture place, with after finishing the trimming operation, the effect that left thread end length shortens relatively on cloth.

The lower thread cutter of Sewing machines of the present utility model has the following advantages compared to prior art: when carrying out the trimming operation, this fixed cutting tool group, intermediate plate group and collude the line bar and can earlier be driven beat simultaneously and be displaced to primary importance, make it comparatively near car pin place, this colludes the line bar and is driven to the second place return primary importance after colluding line afterwards, and under the cooperation of fixed cutting tool group and intermediate plate group, finish the action of trimming, the distance of the second place when shortening the fixed cutting tool group like this and colluding line, left thread end length shortens relatively on cloth and make after finishing the trimming operation.

Description of drawings

For clearlyer understanding the purpose of this utility model, characteristics and advantage, below conjunction with figs. is elaborated to preferred embodiment of the present utility model, wherein:

Fig. 1 is the three-dimensional exploded view of lower thread cutter of the present utility model;

Fig. 2 is that lower thread cutter of the present utility model is assembled in the schematic isometric on the sewing machine platform;

Fig. 3 is the combination stereogram of lower thread cutter of the present utility model;

Fig. 4 is the combination vertical view of lower thread cutter of the present utility model;

Fig. 5 is the combination start vertical view () of lower thread cutter of the present utility model; And

Fig. 6 is the combination start vertical view (two) of lower thread cutter of the present utility model.

The specific embodiment

At first, see also shown in Figure 1ly, it is the three-dimensional exploded view of the lower thread cutter of Sewing machines of the present utility model.

The lower thread cutter of Sewing machines of the present utility model comprises a fixed head 1, a lower installation board 2, a sliding guide plate 3 and a linking swing arm 4; Wherein (below see also Fig. 2):

This fixed head 1, be a reservation shape and by bolt 11 be fixedly arranged on Sewing machines 5 the bed platform 51 on, first end in fixed head 1 is provided with inclined guide groove 12, periphery at this inclined guide groove 12 is provided with the restriction portion 13 that protrudes into inclined guide groove 12 notch peripheries, and establish screw 14 in a side of this end, establish first guide member 15 for group, establish sheathed post 16 in the side of screw 14 again, sheathed fixing for an end of extension spring 17;

This lower installation board 2, on its front end, be respectively equipped with fixed cutting tool group 21 and intermediate plate group 22 below, and establish second guide member 23 in inclined guide groove 12 parts of the corresponding fixed head 1 of this end, fix a guide plate 24 in the rear end of lower installation board 2 side in addition, and establish guide hole 25 at the relative opposite side of guide plate 24, for first guide member, 15 corresponding settings the on the fixed head 1, and be provided with the 3rd guide member 26 asking of guide plate 24 and guide hole 25, the block edge 27 that has an epirelief again in ora terminalis place, the rear end of this lower installation board 2, the other end of the fixing described extension spring 17 in ora terminalis place below lower installation board 2 in addition;

This sliding guide plate 3, its front end is equipped with and colludes line bar 31, and establish an elongated hole 32 longitudinally at the rear of colluding 31 assemblings place of line bar, and a horizontal microscler chute 33 is established at the rear of elongated hole 32, this microscler chute 33 is corresponding ccontaining for the 3rd guide member 26 on the lower installation board 2, and the lower periphery of sliding guide plate 3 is resisted against the upper peripheral edge of the guide plate 24 of lower installation board 2;

This linking swing arm 4, its first end is convexly equipped with the 4th guide member 41, and corresponding establishing in the elongated hole 32 that convexedly stretches in sliding guide plate 3, second end of linking swing arm 4 and electromagnetic valve (not shown))))) be connected with, drive this linking swing arm 4 by electromagnetic valve, be pivoted mutually with fixed head 1 in the middle paragraph place of linking swing arm 4 in addition.

During assembling (please and referring to Fig. 2 to Fig. 4))))), be earlier this linking swing arm 4 to be hubbed on the fixed head 1, again this lower installation board 2 is placed on the linking swing arm 4, and this first guide member 15 is passed the back correspondence to be locked in the screw 14 of fixed head 1 from guide hole 25 places of lower installation board 2, be placed in the inclined guide groove 12 of fixed head 1 and second guide member 23 on the lower installation board 2 is just corresponding, and by the restriction portion 13 restriction blocks that stretch into inclined guide groove 12, to avoid second guide member 23 to break away from this inclined guide groove 12, and an end of extension spring 17 is sheathed on sheathed post 16 on the fixed head 1, it holds the ora terminalis place, below of then being fixed in lower installation board 2 in addition, makes this lower installation board 2 remain an active force toward the displacement of fixed head 1 the place ahead; Continue this sliding guide plate 3 is placed on the lower installation board 2, and microscler chute 33 backs that make the 3rd guide member 26 pass on the sliding guide plate 3 set firmly with lower installation board 2, and the 4th guide member 41 that is arranged on linking swing arm 4 first ends is elongated holes 32 that correspondence is placed through sliding guide plate 3, simultaneously the lower end periphery of sliding guide plate 3 will with guide plate 24 corresponding the reclining of lower installation board 2, and it colludes line bar 31 and passes in the fixed cutting tool group 21 of lower installation board 2.

When this lower thread cutter desires to carry out the trimming action (seeing also Fig. 4 to Fig. 6))), this linking swing arm 4 will be subjected to the driving of electromagnetic valve and articulate part with itself and fixed head 1 is that fulcrum is made first end wobbling action forward, because the 4th guide member 41 on these linking swing arm 4 first ends is to be arranged in the elongated hole 32 of sliding guide plate 3, and the fixed cutting tool group 21 on the lower installation board 2 is colluded line bar 31 because of what establish sliding guide plate 3 with appropriate clamping force folder, simultaneously between fixed head 1 and the lower installation board 2 and be provided with an extension spring 17, make this lower installation board 2 remain an active force toward the displacement of fixed head 1 the place ahead, make the block edge 27 of lower installation board 2 push sliding guide plate 3, add first guide member 15 of the guide hole 25 that stretches into lower installation board 2, and second guide member 23 of lower installation board 2 is placed in the inclined guide groove 12 of fixed head 1 and is subjected to inclined guide groove 12 to set up the guiding of direction to cooperate down, interlock sliding guide plate 3 and lower installation board 2 make it oblique beat displacement forward simultaneously to make operating state that these linking swing arm 4 first ends swing forward, arrive the rear end of guide hole 25 and the front end place that second guide member 23 arrives inclined guide groove 12 until first guide member 15, this lower installation board 2 will be limited in relatively on the fixed head 1 and can't be continued displacement again, this moment this fixed cutting tool group 21 and collude line bar 31 and be positioned at the primary importance (as shown in Figure 5) that the line action is colluded in preparation; When wobbling action is done in first end continuation of linking swing arm 4 forward, to directly drive sliding guide plate 3 separately, because the root edge of this sliding guide plate 3 is subjected to guide plate 24 guiding that limits, simultaneously under the 3rd guide member 26 is embedded at cooperation guiding in the microscler chute 33, drive this sliding guide plate 3 toward anterior displacement, and make it collude line bar 31 like this protruding out fixed cutting tool group 21 to the second place of colluding the line operation, hold suture 6 to prepare to collude.

When finish collude line action after, this electromagnetic valve just begins to return original position and this linking swing arm 4 of interlock, make this linking swing arm 4 retract sliding guide plate 3 by the 4th guide member 41, order is colluded line bar 31 and is got back to primary importance and cooperate fixed cutting tool group 21 to do the trimming action, utilize the relation of the 3rd guide member 26 and microscler chute 33 afterwards again, follow the direction of setting up of inclined guide groove 12 and guide hole 25 to carry out the beat displacement together with sliding guide plate 3 this lower installation board 2, to get back to the home position.

Via above implementation, lower thread cutter of the present utility model as can be known is because of after the lower installation board that this tool can be provided with the fixed cutting tool group and tool establish the sliding guide plate that colludes the line bar and do beat simultaneously and be displaced to primary importance, make sliding guide plate be displaced to again separately for colluding the second place that the line bar colludes line, so as to shortening the distance that the primary importance and the second place are asked, and finish to continue after colluding line action and get back to primary importance colluding the line bar, with this collude the suture got under the cooperation of fixed cutting tool group with its cut-out, and reach the thread end length of staying the suture on the cloth is the distance of relative primary importance to the second place, and therefore thread end length can be shortened relatively.

Claims

1. the lower thread cutter of a Sewing machines is characterized in that comprising:

One fixed head, it is fixedly arranged on the bed platform of Sewing machines, is provided with inclined guide groove in first end of fixed head, and establishes first guide member in this end;

One lower installation board, the above and below of its front end is respectively equipped with fixed cutting tool group and intermediate plate group, and establish second guide member at this end, and correspondence is placed in the aforesaid inclined guide groove, guide hole is established in rear end at lower installation board, be provided with for described first guide member is corresponding, and establish the 3rd guide member in a side of guide channel;

One sliding guide plate, its front end are equipped with and collude the line bar, and establish an elongated hole longitudinally at the rear of colluding assembling place of line bar, and the rear of elongated hole establishes a horizontal microscler chute, and be ccontaining for described the 3rd guide member correspondence;

One linking swing arm, its first end is convexly equipped with the 4th guide member, and correspondence convexedly stretches in the described elongated hole, and its second end and electromagnetic valve are connected with, and are pivoted with fixed head in the place, centre.

2. the lower thread cutter of Sewing machines according to claim 1 is characterized in that, the periphery of this inclined guide groove is provided with the restriction portion that protrudes into inclined guide groove notch periphery, and this second guide member of retaining system.

3. the lower thread cutter of Sewing machines according to claim 1 is characterized in that, this fixed head is provided with screw, establishes fixing for the corresponding spiral shell of first guide member.

4. the lower thread cutter of Sewing machines according to claim 1 is characterized in that, is provided with extension spring between fixed head and lower installation board.

5. the lower thread cutter of Sewing machines according to claim 4 is characterized in that, fixed head is provided with sheathed post, and is sheathed fixing for an end of extension spring.

6. the lower thread cutter of Sewing machines according to claim 1 is characterized in that, rear end one side of lower installation board is fixed a guide plate, for the sliding guide plate guiding that offsets.

7. the lower thread cutter of Sewing machines according to claim 6 is characterized in that, guide plate is located at the opposite side of relative guide hole, and its upper limb also supports the lower edge that is affixed on sliding guide plate.

8. the lower thread cutter of Sewing machines according to claim 1 is characterized in that, the ora terminalis place, rear end of this lower installation board has the block edge of an epirelief.