CN101397730B

CN101397730B - Lower line shearing device of sewing machine

Info

Publication number: CN101397730B
Application number: CN2007101406629A
Authority: CN
Inventors: 林培嘉
Original assignee: GAOLIN CO Ltd
Current assignee: GAOLIN CO Ltd; Kaulin Manufacturing Co Ltd
Priority date: 2007-09-28
Filing date: 2007-09-28
Publication date: 2012-05-30
Anticipated expiration: 2027-09-28
Also published as: CN101397730A

Abstract

The invention relates to an off-thread cutting device of a sewing machine, which comprises a needle board structure, a thread capturing mechanism, a thread cutting mechanism and a swing arm connecting rod mechanism, wherein, the needle board structure comprises a needle board table and a needle board on which needle holes and cutter edge penetrating holes are arranged; the thread capturing mechanism, the thread cutting mechanism and the swing arm connecting rod mechanism are connected under the needle board table. The thread capturing mechanism comprises an upper capturing board and a lower capturing board which are respectively shaped with hook parts corresponding to the needle holes; the thread cutting mechanism comprises an upper cutter edge and a lower cutter edge that are between the needle board and the upper capturing board and the lower capturing board; the swing arm connecting rod mechanism comprises a swing arm, a first connecting rod and a second connecting rod; the first connecting rod and the second connecting rod are respectively connected with the swing arm, the upper cutter edge or the lower capturing board; therefore, the cutting device can stably clamp and cut off-cut threads drawn from a shuttle and ensure that the lengths of thread ends are greatly shortened after the threads are cut.

Description

The lower line shearing device of Sewing machines

Technical field

The present invention refers to a kind of lower line shearing device of Sewing machines especially about a kind of Sewing machines.

Background technology

The lower line shearing device of known Sewing machines; Such as the TaiWan, China patent of invention announce No. 470799 announcement; Mainly comprise vertical line falling bar and lower line shearing device, wherein the line falling bar is fixed in needle plate platform below, and with from sewn object and through being formed on the tabling that rolls off the production line that pinprick on the Sewing machines needle plate arrives shuttle; This line falling bar rolls off the production line along furthering with this direction of intersecting of rolling off the production line, and pulls out rolling off the production line of scheduled volume from this shuttle; Lower line shearing device is being borrowed the broken string that is configured in needle plate below action, will near pinprick, be cut off by rolling off the production line of pulling out of line falling bar; This shearing device comprises rolling off the production line catches member and catches component mobile device; The above-below direction of catching member is disposed between needle plate and the lower line shearing device; And it is removable in being positioned at the pinprick below; Thereby make the active position that shortens from the wire length of cloth to off-position, and and pinprick separate and do not harm between the position of readiness of action of pin; This seizure component mobile device that rolls off the production line makes the seizure member that rolls off the production line when making, be positioned at position of readiness, and after making, before the broken string action of lower line shearing device, moves to active position from position of readiness.

Yet; The lower line shearing device of known Sewing machines though can behind trimming, shorten the end of a thread length, still has following problem points on reality is used; Its line falling bar is vertical; When catching rolling off the production line jointly with the seizure member, easy reasons such as material, elastic force or thickness because of rolling off the production line, and produce fixing instability or clamp bad phenomenon; In addition, its line falling bar pushes against action by cam part and protuberance each other with catching between the member, and usually because of the mismachining tolerance and the matching problem of assembly, and the apprentice increases the manpower time and the cost of assembling.

Summary of the invention

In view of this, main purpose of the present invention, being to provide a kind of can carry out stable clamping and cut off rolling off the production line of pulling out from shuttle, and can guarantee the lower line shearing device of the Sewing machines that the end of a thread length behind the trimming significantly shortens.

In order to reach above-mentioned purpose; The present invention provides a kind of lower line shearing device of Sewing machines; Comprise needle plate structure, catch line mechanism, tangent mechanism and swing arm linkage; Wherein this needle plate structure comprises the needle plate platform and is fixed in the needle plate of this needle plate platform top, on this needle plate, offers pin hole and blade inserting hole; Catch line mechanism and be connected this needle plate platform below, this is caught line mechanism and comprises the following seizure plate of catching plate and being formed at seizure plate below, forms the hook portion corresponding to this pin hole respectively on this upper and lower seizure plate; This tangent mechanism comprises upper knife edge that is connected in this needle plate platform below and the following blade that is connected in this upper knife edge, and this upper and lower blade is between this needle plate and upper and lower seizure plate; The swing arm linkage comprises the swing arm that is connected in this needle plate platform below, is connected in the first connecting rod of this swing arm and this upper knife edge and is connected in this swing arm and the second connecting rod of this time seizure plate; This first connecting rod is made thread cutting action in order to order about this upper and lower blade in this pin hole below, and this second connecting rod then is that the hook portion of ordering about this upper and lower seizure plate is made relative gripping action.

Can know by such scheme, the lower line shearing device of Sewing machines of the present invention, it forms the mutual configuration between mechanism by each, can carry out stable clamping and cut off rolling off the production line of pulling out from shuttle, and can guarantee that the end of a thread length behind the trimming significantly shortens; It is able to move according to the corresponding adjustment of mismachining tolerance do of each composition assembly by the setting of adjustable location-plate, and simplification assembling process and lifting assembling; It directly drives by second connecting rod and catches plate down, can make transmission between the two certain more and stable.

Description of drawings

Fig. 1 is a three-dimensional exploded view of the present invention;

Fig. 2 is a combination upward view of the present invention;

Fig. 3 is applied to the three-dimensional exploded view of Sewing machines for the present invention;

Fig. 4 is applied to each module position figure of sewing state of Sewing machines for the present invention;

Fig. 5 is applied to the catching of Sewing machines, tangent line state diagram for the present invention;

Fig. 6 is applied to the catching of Sewing machines, tangent line state diagram for the present invention;

Fig. 7 is applied to the catching of Sewing machines, tangent line state diagram for the present invention.

Description of reference numerals:

10 needle plate structures, 11 needle plate platforms

111 perforative spaces, 113 first reference columns

114 second reference columns, 115 fixed legs

12 needle plates, 121 pin holes

122 inserting holes, 13 backplates

131 grooves 20 are caught line mechanism

Catch plate 211,223 hook portions on 21

Catch plate 221 oscillating decks 22 times

222 line falling arms, 224 blocking parts

23 location-plates, 231 first blocks

232 second blocks, 233 elongated holes

24 extension springs

30 tangent mechanisms, 31 upper knife edges

32 times blade 33 pressure-ray films

41 swing arms of 40 swing arm linkages

411 limited posts, 42 first connecting rods

43 second connecting rods, 50 driving levers

8 Sewing machiness, 81 horns

82 bases

The specific embodiment

Relevant detailed description of the present invention and technology contents, conjunction with figs. are explained as follows, yet appended accompanying drawing only provides reference and explanation usefulness, is not to be used for the present invention is limited.

Please with reference to Fig. 1 and shown in Figure 2, be respectively three-dimensional exploded view of the present invention and combination upward view, the present invention provides a kind of lower line shearing device of Sewing machines, and it mainly comprises needle plate structure 10, catches line mechanism 20, tangent mechanism 30 and swing arm linkage 40, wherein:

Needle plate structure 10 comprises needle plate platform 11, needle plate 12 and backplate 13; Middle section at needle plate platform 11 offers perforative space 111; And around perforative space 111, be provided with the plural number screw of equal aperture not, below needle plate platform 11, be connected with first reference column 113, second reference column 114 and fixed leg 115 in addition; On needle plate 12, offer microscler pin hole 121 and the blade inserting hole 122 vertical with the long side direction of pin hole 121, this needle plate 12 is fixed in needle plate platform 11 tops by screw; Backplate 13 is pulled between needle plate platform 11 and needle plate 12 by folder in addition, and it is provided with the groove 131 of corresponding aforementioned pin hole 121 and inserting hole 122.

Catch line mechanism 20 and comprise seizure plate 21, be formed at the following seizure plate 22 of catching plate 21 belows and be fixed in the adjustable location-plate 23 of catching plate 21 1 sides, upper and

lower seizure plate

21,22 wears through bolt and repeatedly is connected on aforementioned needle plate platform 11 belows; Side at last seizure plate 21 is connected with extension spring 24 by double-screw bolt in addition, and the other end of this extension spring 24 then is socketed on the aforementioned fixation post 115, so as to controlling the involution effect of catching plate 21; The following seizure plate 22 of present embodiment is combined by oscillating

deck

221 and 222 on line falling arm being connected in oscillating deck 221 1 sides; In like manner it also can be the kenel (figure does not show) that one constitutes; On last seizure plate 21 and line falling arm 222, form shackle link portion 211 and flat U-shaped hook portion 223 respectively, on oscillating deck 221, form corresponding aforementioned first reference column 113 in addition and do spacing blocking part 224 corresponding to aforementioned pin hole 121; Adjustable location-plate 23 has first block 231 and second block 232; And on location-plate 23, offer two elongated holes 233; First block 231 is done spacing corresponding to aforementioned first reference column 113, the adjustment that elongated hole 233 then provides location-plate 23 can do the position is moved.

Tangent mechanism 30 comprises upper knife edge 31, be connected in the following blade 32 of upper knife edge 31 belows and amplexiform in the pressure-ray film 33 of the bottom surface of blade 32 down; This upper and

lower blade

31,32 is between needle plate 12 and upper and lower seizure plate 21, between 22; And be located in the perforative space 111 of needle plate platform 11; Can be arranged in an end of upper knife edge 31 and be articulated in needle plate platform 11 belows by bolt, following blade 32 can be made rotary oscillation and carry out shear line with respect to upper knife edge 31 and pressure-ray film 33.

Swing arm linkage 40 comprises swing arm 41, first connecting rod 42 and second connecting rod 43, is arranged in swing arm 41 and is connected in needle plate platform 11 belows by bolt, and these swing arm 41 1 sides are connected with the limited post 411 of second block 232 of corresponding aforementioned location-plate 23; One end of first and second connecting

rod

42,43 repeatedly pastes each other and wears by bolt and is connected in the swing arm 41; The other end of first connecting rod 42 wears by bolt and is connected on the upper knife edge 31, and the other end of second connecting rod 43 also wears on the oscillating deck 221 that is connected in down seizure plate 22 by bolt; And the bottom of swing arm 41 is by driving mechanism (figure does not show) transmission.

In addition, the present invention also includes driving lever 50, is arranged in driving lever 50 and is connected in needle plate platform 11 belows and corresponding to tangent mechanism 30 configuration, an end of this driving lever 50 opens action in order to promote down blade 32 with respect to upper knife edge 31 works by bolt.

Please with reference to Fig. 3 and shown in Figure 4; Be respectively the present invention and be applied to three-dimensional exploded view and each module position figure of sewing state of Sewing machines, lower line shearing device of the present invention is installed on the sewing machine for binding buttonhole 8, and this Sewing machines 8 has horn 81 and is connected in the base 82 of horn 81 belows; After this shearing device is assembled in advance; Relend by screw and wear the place, left side that is fixed in base 82, in the process of carrying out sewing, drive swing arm 41 by driving mechanism (figure does not show) and be rotated counterclockwise; To drive upper knife edge 31 via first connecting rod 42 turns clockwise; Simultaneously promote second block 232 of location-plates 23, catch plate 21 and do the clockwise direction rotation, catch plate 22 down by second connecting rod 43 pullings in addition and also make clockwise direction and rotate and make by limited post 411; So, upper and

lower seizure plate

21,22 and tangent mechanism 30 pin hole 121 and inserting hole 122 be can make, and the sewing action of car pin (figure does not show) and the work that cuts of rag knife (figure does not show) do not hindered away from needle plate 12.In addition, when swing arm 41 is rotated counterclockwise, can drives driving lever 50 by another driving mechanism (figure do not show) and do the clockwise direction rotation, open kenel and the end of end and the upper knife edge 31 and the pressure-ray film 33 of blade 32 is, so as to preparation as the preshearing line.

Please with reference to Fig. 5, Fig. 6 and shown in Figure 7; Be respectively the present invention and be applied to the catching of Sewing machines, tangent line state diagram; After accomplishing the action of aforesaid sewing and fabric dividing; Can step on action by the counter of pedal (figure does not show), and make drive mechanism swing arm 41 turn clockwise, catch the restriction that plate 21 will break away from limited post 411 by second block 232 of location-plate 23 on this moment; And the elastic force effect of going up extension spring 24; Also draw close toward the centre below of pin hole 121 and the hook portion 211 of catching plate 21 is rotated in a counter-clockwise direction, tangent mechanism 30 moves by the rotation of first connecting rod 42 simultaneously, and makes upper and

lower blade

31,32 formed openings also draw close (as shown in Figure 5) towards the centre below of pin hole 121; By turning clockwise of swing arm 41; Can driving down with second connecting rod 43 simultaneously, seizure plate 22 turns clockwise; And utilize its hook portion 223 to stablize to collude pulling to roll off the production line from what shuttle (figure does not show) was seen off, can will roll off the production line by the relative action of upper and

lower seizure plate

21,22 grips; Simultaneously, upper and

lower blade

31,32 moves by the rotation of first connecting rod 42, and makes down the end of blade 32 do closed and will roll off the production line to cut off with respect to upper knife edge 31 and pressure-ray film 33; So, can guarantee that the end of a thread length behind the trimming significantly shortens.

Claims

1. the lower line shearing device of a Sewing machines is characterized in that, comprising:

Needle plate structure comprises the needle plate platform and is fixed in the needle plate of this needle plate platform top, on this needle plate, offers pin hole and blade inserting hole;

Catch line mechanism, be connected this needle plate platform below, this is caught line mechanism and comprises the following seizure plate of catching plate and being formed at seizure plate below on this, forms the hook portion corresponding to this pin hole respectively on this upper and lower seizure plate;

Tangent mechanism comprises upper knife edge that is connected in this needle plate platform below and the following blade that is connected in this upper knife edge, and this upper knife edge and following blade are between this needle plate and should go up and catch between plate and the following seizure plate; And

The swing arm linkage; Comprise the swing arm that is connected in this needle plate platform below, be connected in the first connecting rod of this swing arm and this upper knife edge and be connected in this swing arm and the second connecting rod of this time seizure plate; This first connecting rod orders about this upper and lower blade and below this pin hole, makes thread cutting action, and this second connecting rod then is that the hook portion of ordering about this upper and lower seizure plate is made relative gripping action.

2. the lower line shearing device of Sewing machines as claimed in claim 1 is characterized in that, said needle plate structure also comprises backplate, and this backplate is pulled between this needle plate platform and this needle plate by folder, and on this backplate, is provided with the groove of corresponding aforementioned pin hole and inserting hole.

3. the lower line shearing device of Sewing machines as claimed in claim 1 is characterized in that, offers perforative space on the said needle plate platform, and this tangent mechanism is located in this perforative space.

4. the lower line shearing device of Sewing machines as claimed in claim 1; It is characterized in that; Said needle plate platform below is connected with first reference column; In addition this is caught line mechanism and also comprises the adjustable location-plate that is fixed in seizure plate one side this on, and on this location-plate, be provided with to should first reference column to stop the first spacing block each other.

5. the lower line shearing device of Sewing machines as claimed in claim 4 is characterized in that, said location-plate also is provided with second block, in addition this swing arm one side be connected with to should second block to stop spacing limited post each other.

6. the lower line shearing device of Sewing machines as claimed in claim 4; It is characterized in that; Said needle plate platform below is connected with second reference column, and this time seizure plate comprises oscillating deck in addition, and on this oscillating deck, form to should second reference column to stop spacing blocking part each other.

7. the lower line shearing device of Sewing machines as claimed in claim 6 is characterized in that, the said plate of catching down also comprises the line falling arm that is connected in this oscillating deck one side, and this hook portion is formed on this line falling arm.

8. the lower line shearing device of Sewing machines as claimed in claim 7 is characterized in that, the said hook portion that is formed at this line falling arm is flat U-shaped.

9. the lower line shearing device of Sewing machines as claimed in claim 1 is characterized in that, the said hook portion of catching plate on this that is formed at is V-shaped.

10. the lower line shearing device of Sewing machines as claimed in claim 1; It is characterized in that said needle plate platform below is connected with fixed leg, this is caught line mechanism and more comprises extension spring in addition; One end of this extension spring is connected in this fixed leg, and the other end then is connected in a side of catching plate on this.

11. the lower line shearing device of Sewing machines as claimed in claim 1 is characterized in that, said tangent mechanism also comprises the pressure-ray film that amplexiforms in the bottom surface of following blade, and this time blade can be made rotary oscillation with respect to this upper knife edge and this pressure-ray film.

12. the lower line shearing device of Sewing machines as claimed in claim 1; It is characterized in that; Also comprise driving lever, this driving lever is connected in this needle plate platform below and corresponding to this tangent mechanism configuration, an end of this driving lever promotes this time blade and does to open action with respect to this upper knife edge.