CN101532222B

CN101532222B - Upper thread-trimming device of a sewing machine

Info

Publication number: CN101532222B
Application number: CN2008100864342A
Authority: CN
Inventors: 顾飞龙
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-03-13
Filing date: 2008-03-13
Publication date: 2012-11-21
Anticipated expiration: 2028-03-13
Also published as: CN101532222A

Abstract

The invention relates to an upper thread-trimming device of a sewing machine. The device is provided with a bottom plate, a trimmer arm pivoted with the bottom plate, a drive arm interlocked with the trimmer arm, a hook bar fixedly arranged on the drive arm, a crank and a connecting bar, wherein a trimmer and a clamping piece are connected with and arranged on the trimmer arm and the crank and the connecting bar are used for assembling the device between the drive arm and a power supply. With the design, the hook bar can swing within a certain range and threads of an upper interlocking machine within the swinging range of the hook bar are gathered and drawn by the hook bar; and accordingly, under the condition that the threads of the upper interlocking machine become loose and deviate from the drawing position originally corresponding to the hook bar of the upper thread-trimming device, the hook bar can still draw the threads of the upper interlocking machine and have effect of cutting off threads.

Description

Thread cutting device on the Sewing machines

Technical field

Thread cutting device on the relevant a kind of Sewing machines of the present invention.

Background technology

General common sewing machine is installed with three car pins to wear the online thread, so that behind sewing, had online thread in three roads on the fabric on the needle stand of upper and lower sewing start; Be in addition the effect that goes out to knot of sewing on three roads online thread again, and be provided with upper and lower shuttle needlework, after sewing finishes; To surf the Net the end of a thread of thread of the last thread cutting device that promptly installs additional with correspondence colludes with raker and pulls; With cutting knife the end of a thread is cut off again, and with intermediate plate with the end of a thread clamping, for the carrying out of sewing operation next time; According to this, reach the effect of a rapid automatized tangent line.

See also Fig. 8, shown in Figure 9, be the last thread cutting device 9 of existing a kind of Sewing machines, it mainly is provided with a base plate 91; And on this base plate 91, be installed with cutting knife plate 92; And in this cutting knife plate 92, be equipped with an actuating arm 93, in the affixed raker 94 of these actuating arm 93 front ends, on this cutting knife plate 92, protrude out cutter arm 921 again again; Be connected with cutting knife 95 in these cutter arm 921 front ends again; And be provided with intermediate plate 96 in these cutting knife 95 inboards, and raker 94 front end hook parts 941 passed by

cutting knife

95 and 96 of intermediate plates, pass again outer actuating arm 93 rear ends of cutting knife plate 92 then with a power source 97 force-output shafts 971 on the driver blade 98 that is connected connect;

Whereby, when the sewing take-up, the raker 94 that driver blade 98 drivings that the force-output shaft 971 of power source 97 promptly does to be dynamically connected are connected with mutually parallel lines forward stretches out; Pull after the suture and raker 94 front end hook parts 941 are colluded, power source 97 drives the driver blade 98 that is connected again with raker 94 take-up of pulling back, when suture retracts; Promptly can pass through cutting knife 95; After by cutting knife 95 suture being cut off again, and clamp, to accomplish the effect of automatic tangent by 96 of intermediate plates.

Yet when reality was used, the normal thread of finding to surf the Net not was to remain in tension often; Sometimes be loosening state on the contrary; Be loosening in this online thread, and depart under the corresponding situation of colluding the position of pulling of its raker of original and last thread cutting device 94, because the action that its raker 94 of thread cutting device only can stretch out as parallel lines on existing; So raker 94 front end hook parts 941 promptly can't be caught on the online thread really; In this, promptly cause Sewing machines automatic tangent function that mistake takes place and lose, so that influence the smoothness of whole sewing operation.

" auxiliary location structure of thread cutting device on sewing machine " of No. the 587637th, TaiWan, China patent announcement in addition; And " the upper hook meedle line thread cutting device of Sewing machines " of No. the 284206th, TaiWan, China patent announcement is all the application case of the last thread cutting device of relevant Sewing machines; And in the last thread cutting device of above-mentioned Sewing machines; All there is the online thread loosening; Only make can't really the online thread to be colluded and pull as the raker that parallel lines is stretched out action, and the disappearance that causes the sewing operation to have some setbacks.

Therefore; Because in the last thread cutting device design of existing Sewing machines; Can't catch on the disappearance of online thread really; For many years in the manufacturing of association area and design experiences and knowledge and through clever thought in many ways, the research and development of making renewal to the last thread cutting device of this Sewing machines improve the application inventor, in the hope of bringing into play its higher Practical Benefit property by it.

Summary of the invention

The purpose of this invention is to provide thread cutting device on a kind of Sewing machines; Thread is loosening state to prevent to surf the Net; And depart under the corresponding situation of colluding the position of pulling of original and last its raker of thread cutting device, still can really the online thread be colluded and pull, and reach the effect of automatic tangent.Thread cutting device on the Sewing machines of the present invention, it includes base plate, and is articulated in the cutter arm on the base plate; Cutting knife and intermediate plate with being arranged on the cutter arm are provided with actuating arm again, to set firmly mutually with raker; Also be provided with crank, connecting rod, for being connected between actuating arm and power source; Wherein:

This base plate, the affixed power source in its rear end sets firmly cutter arm in the base plate front end again;

This cutter arm, it is articulated in the base plate front end, and locking is corresponding cutting knife of setting up and intermediate plate in the cutter arm front side; And between this cutting knife and intermediate plate, be formed with the gap; Make this cutter arm be provided with a lockhole again, pull, be arranged with a blocking part in this cutter arm rear side root edge again for locking mutually with a navigation button; And make base plate be positioned at this root edge place, blocking part lock spacing button of pulling, with preparatory confession and blocking part block mutually;

This actuating arm; Be provided with a long slot bore on it, and the lock navigation button of pulling on cutter arm is passed in this long slot bore thus, again in the affixed raker of actuating arm front end; And this raker front end is the hook part of shaping one overhead kick; And this raker front end is set out by the gap that forms between cutting knife that is fixed in cutter arm and intermediate plate, this actuating arm rear end and connecting rod one end are pivoted each other, and other end of this connecting rod is articulated with crank one end; And make this connecting rod and crank form angle and set up, crank is held in addition set firmly mutually with the power transmission shaft of power source.

The useful technique effect of above-mentioned design of the present invention is: make raker can do the swing of certain amplitude; And the online thread in raker amplitude of fluctuation scope all receives raker to draw in to collude and pulls, therefore; Produce loosening in the online thread; And depart under the corresponding situation of colluding the position of pulling of original and last its raker of thread cutting device, can also reach and collude the online thread of pulling really, and take-up is cut off reliably.

Description of drawings

Fig. 1 is the overall perspective view of one embodiment of the invention;

Fig. 2 is the side view of one embodiment of the invention;

Fig. 3 is that the raker of one embodiment of the invention stretches out state diagram;

Fig. 4 is that the state diagram of pulling is colluded in the raker swing of one embodiment of the invention;

Fig. 5 is the raker retracted state figure of one embodiment of the invention;

Fig. 6 is the raker swing return state diagram of one embodiment of the invention;

Fig. 7 is the another embodiment of the present invention side view;

Fig. 8 is the stereogram of prior art structure;

Fig. 9 is the user mode figure of prior art structure.

The specific embodiment

And be more to know the effect of understanding technological means of the present invention and reaching, conjunction with figs. is elaborated as follows to preferred embodiment of the present invention at present:

At first, see also Fig. 1, shown in 2, be thread cutting device on the Sewing machines of the present invention; It is installed on the sewing machine side edge, includes base plate 1, and is articulated in the cutter arm 2 of base plate 1; Cutting knife 3 and intermediate plate 4 with being arranged on the cutter arm 2 are provided with actuating arm 5 again, to set firmly mutually with raker 6; Be provided with crank 71, connecting rod 72 again, for being connected to 8 of actuating arm 5 and power sources; Wherein:

This base plate 1 is provided with lockhole 11 in its rear end, wear with preparatory confession locking part 12, and with power source 8 Joints, make this base plate 1 front end be provided with pivot hole 13 in addition again, wear with preparatory confession articulated part 14, to be pivoted mutually, make cutter arm 2 form a swing fulcrum at this with cutter arm 2;

This cutter arm 2, it is articulated in base plate 1 front end, and the locking correspondence is set up in cutter arm 2 front sides cutting knife 3 and intermediate plate 4; And between this cutting knife 3 and intermediate plate 4, promptly be formed with the gap, and be set out for raker 6, make this cutter arm 2 be provided with a lockhole again; Pull for locking mutually with a navigation button 21; Be provided with the blocking part 22 in a rounded hole in these cutter arm 2 rear side root edges again, and make base plate 1 be positioned at this 22 root edge places, blocking part lock spacing button 23 of pulling, with preparatory confession and blocking part 22 block mutually;

This actuating arm 5 is provided with a long slot bore 51 on it, and the navigation button 21 of pulling on cutter arm 2 for lock passes in this long slot bore 51 thus; Again in the affixed raker 6 of actuating arm 5 front ends; And these raker 6 front ends are the hook parts 61 of an overhead kick that are shaped, and these raker 6 front ends are set out by the cutting knife that is fixed in

cutter arm

23 and 4 gaps that form of intermediate plate, and these actuating arm 5 rear ends and connecting rod 72 1 ends are pivoted each other; This connecting rod 72 is held with crank 71 1 ends in addition to be articulated; And make this connecting rod 72 form angles with crank 71 to set up, making crank 71 power transmission shaft 81 Joints of end and power source 8 in addition again, this power source 8 is electromagnet; Be equipped with an elastic component 73 at

crank

71 and 1 of base plate in addition, this elastic component 73 is a spring.

In view of the above; After the needlework sewing comes to an end, and desire to make on the Sewing machines thread cutting device will surf the Net thread when cutting off, see also shown in Figure 3; The power source 8 of thread cutting device is activated on the Sewing machines; The power transmission shaft 81 of this power source 8 rotates, and the crank 71 that the power transmission shaft 81 in the rotation just drives Joint rotates, turn left in rotating crank 71 immediately the connecting rod 72 that joins of interlock do the swing that moves down; At this moment, toward the connecting rod 72 of lower swing, promptly drive the actuating arm 5 past anterior displacements that are connected gradually, making cutter arm 2 is the beat that fulcrum is done an angle with articulated

part

14, and 22 upper limbs limit by being butted on spacing button 23 up to the blocking part;

Please continue to consult shown in Figure 4; Along with connecting rod 72 continues toward lower swing, and push actuating arm 5 rear ends, the long slot bore 51 on the actuating arm 5 also be fixed in relatively on the cutter arm 2 navigation button 21 and toward anterior displacement; After supporting under the pressure of long slot bore 51 rear ends to navigation button 21; Actuating arm 5 promptly stops start forward, this moment, toward actuating arm 5 front ends of anterior displacement projection and going out in the gap that promptly gradually forms by cutting knife 3 and intermediate plate 4 of affixed raker 6;

Continuing, seeing also shown in Figure 5ly, turning right driven by power source 8 when rotating when crank 71, was that the elastic component 73 under the compressive state is promptly discharged originally; At this moment, crank 71 is by elastic component 73 pushing and pressing homings, and the connecting rod 72 that is articulated with crank 71; I.e. up swing, and make connecting rod 72 pulling actuating arms 5 toward superior displacement, making cutter arm 2 is the beat that fulcrum is done an angle with articulated part 14; 22 lower edges limit by being butted on spacing button 23 up to the blocking part, and make actuating arm 5 front ends with respect to actuating arm 5 rear ends of up swinging, and do an action toward lower swing; Whereby, the raker 6 that is fixed in actuating arm 5 front ends also is the swing of an amplitude, in this effect down; Online thread in raker 6 amplitude of fluctuation scopes can be colluded by 61 gatherings in hook part of raker 6 and pull, in view of the above; Even produce looseningly at the online thread, and depart under the corresponding situation of colluding the position of pulling of its raker of original and last thread cutting device 6, raker 6 can also reach really the thread of surfing the Net is colluded the effect of pulling.

At last, see also shown in Figure 6 because the lasting travelling backwards of connecting rod 72; Move after driving actuating arm 5, and the navigation button 21 that the long slot bore of being located on the actuating arm 5 51 also is fixed on the cutter arm 2 is relatively done toward backward shift, after supporting under the pressure of long slot bore 51 front ends to navigation button 21; The raker 6 that these actuating arm 5 front ends set firmly promptly along with actuating arm 5 front ends are done retraction, and will utilize 61 of its hook parts to collude the online thread of holding by raker 6; Setting by intermediate plate 4 and cutting knife 3; The thread of will surfing the Net cuts off, and by intermediate plate 4 with the end of a thread clamping, to wait for the sewing of next time.

Program is according to this promptly accomplished thread cutting device on the Sewing machines of the present invention-raker 6 is stretched out, and makes raker 6 do the swing of an amplitude again; Collude the online thread of pulling with gathering; Continuing regains raker 6, and cuts off the online thread and the end of a thread folder is pulled, then the motion flow of raker 6 homings.

See also shown in Figure 7ly, be another embodiment of the present invention, it can make power transmission shaft 81 Joints (and this power source 8 is cylinders) of connecting rod 72 and power source 8; According to this, utilize the power transmission shaft 81 of this power source 8 directly to promote connecting rod 72 starts, and then drive actuating arm 5, cutter arm 2 and raker 6 starts; Make raker 6 do the swing of an amplitude with completion; Draw in again and collude the online thread of pulling, and after raker 6 is regained, cut off the online thread; And the end of a thread folder pulled, then make the equivalent action flow process of raker 6 homings.

Can know that by said structure and embodiment the present invention has following advantage:

1. thread cutting device can make raker be the swing of certain amplitude on the Sewing machines of the present invention, acts on down the online thread in raker amplitude of fluctuation scope in this; All can receive raker to draw in to collude pulls; Whereby, even produce looseningly at the online thread, and depart under the corresponding situation of colluding the position of pulling of original and last its raker of thread cutting device; Can also reach the thread of to surf the Net really and collude the effect of pulling; And effectively improve on the existing sewing machine the linearly mode of translation start of its raker of thread cutting device, can't the online thread that become flexible be done to collude and pull, the situation that the generation mistake on the automatic tangent that is caused is lost.

2. thread cutting device is on base plate, to set firmly a spacing button on the Sewing machines of the present invention; And the blocking part that this spacing button can be arranged with cutter arm rear side root edge block mutually; Therefore, promptly the position of spacing button is provided with whereby, and reaches the effect of setting the raker amplitude of fluctuation that is connected with cutter arm.

Claims

1. thread cutting device on the Sewing machines, it includes base plate, cutter arm, cutting knife and intermediate plate, actuating arm, raker, and connecting rod and power source; It is characterized in that:

This base plate is affixed power source in its rear end, is provided with the pivot hole in the base plate front end again, with the cutter arm that is pivoted;

This cutter arm; Be that activity is articulated in base plate front end pivot hole, and locking is corresponding cutting knife of setting up and intermediate plate in the cutter arm front side, and is to be formed with the gap between this cutting knife and intermediate plate; Be provided with navigation button in this cutter arm again; Establish a blocking part in this cutter arm rear side root edge again, and make base plate be positioned at place, this blocking part lock spacing button of pulling, with preparatory confession and blocking part block mutually;

This actuating arm; Be to be provided with a long slot bore on it, and the navigation button of being located on the cutter arm is passed in this long slot bore thus, again in the affixed raker of actuating arm front end; And this raker front end is the hook part of shaping one overhead kick; And this raker front end is set out by the gap that forms between cutting knife that is fixed in cutter arm and intermediate plate, this actuating arm rear end and connecting rod one end are pivoted each other, and make this connecting rod in addition the power transmission shaft of end and power source connect and make this connecting rod and this actuating arm formation angle to set up.

2. thread cutting device on the Sewing machines according to claim 1; It is characterized in that; Further be provided with a crank between the power transmission shaft of this power source and connecting rod; This crank one end and connecting rod one end are articulated, crank in addition end then with the power transmission shaft Joint of power source, and this connecting rod and crank formation angle are set up.

3. thread cutting device on the Sewing machines according to claim 2 is characterized in that, is equipped with an elastic component between this crank and base plate.

4. thread cutting device on the Sewing machines according to claim 3 is characterized in that this elastic component is a spring.

5. thread cutting device on the Sewing machines according to claim 1 is characterized in that, this blocking part is to be configured as a circular port.

6. thread cutting device on the Sewing machines according to claim 1 is characterized in that this power source is a cylinder.

7. thread cutting device on the Sewing machines according to claim 1 and 2 is characterized in that this power source is an electromagnet.