CN101392438A

CN101392438A - Needle line cutting off device of sewing machine

Info

Publication number: CN101392438A
Application number: CNA2007101518338A
Authority: CN
Inventors: 林培嘉
Original assignee: GAOLIN CO Ltd
Current assignee: GAOLIN CO Ltd; Kaulin Manufacturing Co Ltd
Priority date: 2007-09-20
Filing date: 2007-09-20
Publication date: 2009-03-25

Abstract

The invention relates to a thread-cutting device of a sewing machine, which is connected with the sewing machine and includes a cam mechanism, a fixedly holding mechanism, a supporting mechanism, a scissors driving group and a thread scissors; wherein, the cam mechanism comprises a cam, a scissors and a locating cam arm; the fixed holding mechanism comprises a fixed arm and a moving component which can slide relative to the fixed arm; the supporting mechanism comprises a seat plate that is driven by the cam arm and is connected with the moving component and a supporting arm group connected to the seat plate; the scissors driving group comprises a driving arm which is connected to the scissors cam arm and a shifter lever that is pivoted with the supporting arm group; and the thread scissors comprises a counteredge connected to the supporting arm group and a movable blade connected to the counteredge. Therefore, the structure leads the movement of the whole structure to be stable and the position to be accurate so as to improve the thread-cutting effect.

Description

The needlework shearing device of Sewing machines

Technical field

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

Background technology

The needlework shearing device of known Sewing machines, such as the Taiwan patent of invention announce No. 548360 announcement, this needlework shearing device comprises cam mechanism, supporting mechanism, scissors driving group and needlework scissors, and wherein cam mechanism comprises and driven by positioning motor and the cam of rotation, be subjected to cam drive and weft cutter cam arm and the positioning cam arm swung; This supporting mechanism comprises the seat board that driven by this positioning cam arm, and an end of this seat board is fixed on the flat board; Scissors driving group comprises projection that is connected in this weft cutter cam arm and the driving lever that is articulated in seat board; This needlework scissors comprises counteredge that is connected in seat board and the mobile blade that is connected in counteredge; So, to be combined into the needlework shearing device.

Yet, the needlework shearing device of known Sewing machines, on using, reality still has following problem points, because shearing device is when carrying out the trimming action, need do front, rear, left and right and upper and lower to move, and its only with support arm carry all wt (static load) that supports most of assembly, and each assembly between relative action (dynamic load), often make shearing device produce upset and off normal phenomenon, and cause the shear effect instability, remain really to be improved.

Summary of the invention

In view of this, main purpose of the present invention is to provide that a kind of overall structure horizontal and vertical movement are stable, the needlework shearing device of the Sewing machines of accurate positioning.

In order to reach above-mentioned purpose, the invention provides a kind of needlework shearing device of Sewing machines, in order to be connected on the Sewing machines body, this Sewing machines has motor, this shearing device comprises cam mechanism, fixing structure, supporting mechanism, scissors driving group and needlework scissors, and wherein this cam mechanism comprises and driven by described positioning motor and the cam of rotation, be subjected to this cam drive and weft cutter cam arm and the positioning cam arm swung; This fixing structure comprises fixed arm that is connected in described body and the moving assembly that can make sliding transfer with respect to this fixed arm; This supporting mechanism comprises seat board that is subjected to this positioning cam arm driving and the support arm group that is connected in an end of this seat board, and the other end of this seat board is connected on this moving assembly; The driving lever that this scissors driving group comprises the actuating arm that is connected in this weft cutter cam arm and is connected in this actuating arm and is articulated in this support arm group; This needlework scissors comprises counteredge that is connected in this support arm group and the mobile blade that is connected in this counteredge, and this mobile blade is driven by this driving lever and can swing with respect to this counteredge.

By such scheme as can be seen, the needlework shearing device of Sewing machines of the present invention, it forms mutual configuration between mechanism by each, can make that integrally-built horizontal and vertical movement are stable, accurate positioning, to increase the needlework scissors to the needlework shear effect; Be located at a side near the needlework scissors by the weft cutter cam arm, can significantly shorten the length of actuating arm and increase its bulk strength, really stable more when driving lever is driven; End by each extension spring is fixed on the body respectively, and increases the advancing and the involution active force of left and right direction of supporting mechanism, scissors driving group, needlework scissors.

Description of drawings

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

Fig. 2 is a combined front view of the present invention;

Fig. 3 is a combination vertical view of the present invention;

Fig. 4 is applied to the three-dimensional exploded view of Sewing machines for the present invention;

Fig. 5 is applied to the cutter initial point front view of Sewing machines for the present invention;

Fig. 5 A is applied to the cutter initial point vertical view of Sewing machines for the present invention;

Fig. 6 waits to cut the state front view for what the present invention was applied to Sewing machines;

Fig. 6 A waits to cut the state vertical view for what the present invention was applied to Sewing machines;

Fig. 7 is applied to the preshearing state front view of Sewing machines for the present invention;

Fig. 7 A is applied to the preshearing state vertical view of Sewing machines for the present invention;

Fig. 8 is applied to the shearing condition front view of Sewing machines for the present invention;

Fig. 8 A is applied to the shearing condition vertical view of Sewing machines for the present invention.

Description of reference numerals:

10 cam mechanisms, 11 cams

111 centre bores, 112 front guide slot

113 back guide groove 114 detecting parts

12 weft cutter cam arms, 121 rollers

13 positioning cam arms, 131 rollers

132 spreaders

20 fixing structures, 21 fixed arms

211 fixed blocks, 212 U-shaped plates

213 guide rods, 22 moving assemblies

221 rollers, 222 inner props

223 sleeves

30 supporting mechanisms, 31 seat boards

311 skewed slots, 312 fixing holes

313 arcuate sockets, 314 screw rods

32 support arm groups, 321 support arms

322 fixed blocks, 33 first extension springs

34 adjust assembly 35 second extension springs

41 actuating arms are organized in 40 scissors drivings

42 driving levers, 43 d-axis

50 needlework scissors, 51 counteredges

52 mobile blades, 521 flanges

53 thread tension discs

60 inductors

70 blades hold follow block 71 and hold to sheet

8 bodies, 81 bases

82 upper arm, 83 flat boards

84 positioning motors, 85 needle plates

851 inserting holes, 852 pin holes

86 pressing elements

The specific embodiment

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

Please refer to Fig. 1, Fig. 2 and shown in Figure 3, be respectively three-dimensional exploded view of the present invention, combined front view and combination vertical view, the invention provides a kind of needlework shearing device of Sewing machines, it is in order to be fixedly connected on (as shown in Figure 4) on the Sewing machines body 8, this Sewing machines has flat board 83 and is connected in the positioning motor 84 of flat board 83, and the needlework shearing device mainly comprises cam mechanism 10, fixing structure 20, supporting mechanism 30, scissors driving group 40 and needlework scissors 50, wherein:

Cam mechanism 10 comprises cam 11, weft cutter cam arm 12 and positioning cam arm 13, and this cam 11 is the subcircular dish, has been formed centrally centre bore 111 therein, in order to the motor 84 axle cross-under that pass dull and stereotyped 83; Guide groove 113 after 111 appropriate positions, distance center hole are respectively equipped with arc front guide slot 112 and arc convexes with detecting part 114 at the outer peripheral edges one side place of cam 11 again in addition.One end of weft cutter cam arm 12 is articulated on the flat board 83 of body 8 with bolt, and is connected with the roller 121 that is installed with in the front guide slot 112 of cam 11 thereon.One end of positioning cam arm 13 also is articulated on dull and stereotyped 83 with bolt, and be positioned at the rear side of weft cutter cam arm 12, be connected with the roller 131 of the back guide groove 113 that is located in cam 11 on positioning cam arm 13, the right side is connected with spreader 132 below positioning cam arm 13 in addition.

Fixing structure 20 comprises fixed arm 21 that is connected in dull and stereotyped 83 and the moving assembly 22 that can make sliding transfer with respect to fixed arm 21, and the fixed arm 21 of present embodiment is made up of the guide rod 213 that is fixed in dull and stereotyped 83 fixed block 211, is connected in the U-shaped plate 212 of fixed block 211 1 sides and is connected and fixed piece 211 and be parallel to U-shaped plate 212; The moving assembly 22 of present embodiment by the roller 221 that is located in U-shaped plate 212 inside, be connected in the inner prop 222 of roller 221 and be socketed on the sleeve 223 of the outside of inner prop 222, this inner prop 222 and sleeve 223 are socketed on the aforementioned guide rod 213, and be more stable so as to moving of the horizontal direction that makes moving assembly 22.

Supporting mechanism 30 comprises seat board 31 and support arm group 32, and this seat board 31 is roughly L-shaped, is provided with the skewed slot 311 of the spreader 132 that is socketed in positioning cam arm 13 at vertical plate body a corner of seat board 31, so as to the mobile orientation of control seat board 31; Be provided with in addition for bolt and wear the fixing hole 312 that is connected aforementioned sleeve 223, and be pivot and supply bolt to wear the arcuate socket 313 that is connected aforementioned sleeve 223, and seat board 31 can be swung with respect to sleeve 223 with fixing hole 312 at the horizontal plate body rear of seat board 31; Be connected with first extension spring 33 that screw rod 314 and two ends are connected to screw rod 314 and body 8 inside in addition in the horizontal plate body bottom of seat board 31, so as to increasing the involution active force of supporting mechanism 30 front and rear directions; And, on the horizontal plate body of seat board 31, be connected with and adjust assembly 34, to adjust the involution location point of seat board 31.Support arm group 32 comprises support arm 321 and fixed block 322, the rear end of support arm 321 is fixed on vertical plate body of seat board 31 with screw, 322 front ends that are fixed in support arm 321 of fixed block, be connected with second extension spring 35 at support arm 321 rear sides in addition, the other end of second extension spring 35 then is connected on the column of body 8, so as to increasing the progression force of supporting mechanism 30 left and right directions.

Scissors driving group 40 comprises actuating arm 41 and driving lever 42, the rear end of actuating arm 41 is connected in the bottom of weft cutter cam arm 12, the front end of actuating arm 41 passes d-axis 43 with screw and is connected in driving lever 42 tops again, the place, upper middle side of driving lever 42 then wears and is fixedly connected on the aforementioned fixation piece 322 by screw, and orders about driving lever 42 and do forward and backward swing by the forward and backward mobile of actuating arm 41.

Needlework scissors 50 comprises counteredge 51 and mobile blade 52, counteredge 51 is fixed in the front end of support arm 321, mobile blade 52 then is connected in counteredge 51 tops, and on mobile blade 52, form the flange 521 of two corresponding aforementioned driving levers, 42 bottoms, can order about mobile blade 52 and do to open or closed action by the forward and backward swing of driving lever 42 with respect to counteredge 51; Above mobile blade 52, be connected with in addition thread tension disc 53,, still can temporaryly carry out fixing, and prevent that effectively needlework break away from from needle bar needlework in order to after counteredge 51 and mobile blade 52 are cut off needlework (figure does not show).

In addition, the present invention also comprises inductor 60, this inductor 60 is fixed on the flat board 83 of body 8, and corresponding to detecting part 114 configuration of aforementioned cam 11, when 60 pairs of detecting parts 114 of inductor are detected, inductor 60 will be exported the control device (figure do not show) of detection signal to Sewing machines, and the signal that this control device is sent according to inductor 60 judges whether this shearing device is in (shown in Fig. 5 A) on the cutter initial point.

Please refer to shown in Figure 4, be applied to the three-dimensional exploded view of Sewing machines for the present invention, needlework shearing device of the present invention is installed on the sewing machine for binding buttonhole body 8, this body 8 has base 81 and is connected in the upper arm 82 of base 81 tops, this shearing device earlier with aforementioned dull and stereotyped 83 and positioning motor 84 assemblings after, relend by screw and wear dull and stereotyped 83 and be fixed in upper arm 82 back sides, and the needle bar (figure does not show) that makes needlework scissors 50 correspondences be formed at body 8 is located on every side; So, can reach the combination of shearing device and body 8.

Please refer to Fig. 5 to shown in Figure 8, be respectively the present invention and be applied to the front view and the vertical view of each step of tangent line of Sewing machines, wherein Fig. 5 and Fig. 5 A, initial detecting location after start, detecting part 114 sensings by 60 pairs of cams 11 of inductor, and control device is to orientation, the axle center control of positioning motor 84, can make each roller 121 of weft cutter cam arm 12 and positioning cam arm 13,131 and the detecting part 114 of cam 11 roughly on same horizontal line (as shown in Figure 5), and the front end of needlework scissors 50 then is positioned at inserting hole 851 tops (shown in Fig. 5 A) of the needle plate 85 of Sewing machines body 8; And be used as the cutter initial point of Sewing machines with this.

Fig. 6 and Fig. 6 A, desire carries out sewing and cuts the hole adding man-hour to cloth, with pressing element 86 the cloth feed collet is pulled between itself and the needle plate 85, and make clockwise direction by positioning motor 84 driving cams 11 and rotate, and make cam 11 with its each guide groove 112,113, drive each roller 121 of weft cutter cam arm 12 and positioning cam arm 13 respectively, 131, and make weft cutter cam arm 12 and positioning cam arm 13 according to roller 121,131 curve is done corresponding swing, and make each roller 121,131 lay respectively at before, back guide groove 112,113 start of a run place, and drive needlework scissors 50 and be shifted in the inserting hole 851 and pin hole 852 outsides (as shown in Figure 6A) of needle plate 85, and do not interfere the perforate of the sewing and the cutting knife (figure does not show) of suture needle.

Fig. 7 and Fig. 7 A, after finishing aforesaid sewing and cutting out the hole action, and preparation is when cutting off needlework, then do rotation counterclockwise by positioning motor 84 driving cams 11, and make cam 11 drive each roller 121 of weft cutter cam arm 12 and positioning cam arm 13 respectively, 131, and make each roller 121,131 lay respectively at each guide groove 112, place, inclined to one side rear in the middle of 113 the stroke, while is with the spreader 132 of positioning cam arm 13, the moving assembly 22 of fixing structure 20 and the seat board 31 and the support arm group 32 of supporting mechanism 30 are forwards moved, and make weft cutter cam arm 12 drive the actuating arm 41 and the driving lever 42 of scissors driving group 40, and the bottom that makes driving lever 42 promotes the downside flange 521 of mobile blade 52, make the end of counteredge 51 and mobile blade 52 form opening shape (shown in Fig. 7 A), with preparation as preshearing.

Fig. 8 and Fig. 8 A, after finishing the warming-up exercise of aforementioned preshearing, when needlework are cut off, this needlework shearing device comprises that also the terminal blade of pressing element arm (dotted line) that is fixed in base 81 holds follow block 70, and hold the middle of follow block 70 in this and locate to extend to convex with downwards to hold to sheet 71, continue to do rotation counterclockwise by positioning motor 84 driving cams 11, and make cam 11 drive each roller 121 of weft cutter cam arm 12 and positioning cam arm 13 respectively, 131, and make each roller 121,131 lay respectively at each guide groove 112,113 place, stroke end, while is with the spreader 132 of positioning cam arm 13, with moving assembly 22, seat board 31, support arm group 32 and needlework scissors 50 move to pin hole 852 centers of right front, recline towards holding to support by the upside flange 521 of mobile blade 52 to the direction of sheet 71, the end of military order mobile blade 52 is done closed with respect to counteredge 51 and needlework (figure does not show) is cut off, and the needlework folder that will be connected in suture needle is pulled between mobile blade 52 and thread tension disc 53, come off from suture needle by the needlework after cutting off so as to preventing, to finish the action of trimming.

Claims

1, a kind of needlework shearing device of Sewing machines, in order to be connected on the Sewing machines body, this Sewing machines has motor, it is characterized in that, and described shearing device comprises:

Cam mechanism comprises and driven by described motor and the cam of rotation and be subjected to this cam drive and weft cutter cam arm and the positioning cam arm swung;

Fixing structure comprises fixed arm that is connected in described body and the moving assembly that can make sliding transfer with respect to this fixed arm;

Supporting mechanism comprises seat board that is subjected to this positioning cam arm driving and the support arm group that is connected in an end of this seat board, and the other end of this seat board is connected on this moving assembly;

Scissors driving group comprises the actuating arm that is connected in this weft cutter cam arm and is connected in this actuating arm and is articulated in the driving lever of this support arm group; And

The needlework scissors comprises counteredge that is connected in this support arm group and the mobile blade that is connected in this counteredge, and this mobile blade is driven by this driving lever and can swing with respect to this counteredge.

2, the needlework shearing device of Sewing machines as claimed in claim 1 is characterized in that, described cam is respectively equipped with front guide slot and back guide groove, and this weft cutter cam arm and this positioning cam arm are connected with the roller that is located in this forward and backward guide groove respectively.

3, the needlework shearing device of Sewing machines as claimed in claim 1 is characterized in that, described fixed arm comprises the fixed block that is fixed in described body, the U-shaped plate that is connected in this fixed block one side, reaches the guide rod that connects this fixed block and be parallel to the U-shaped plate.

4, the needlework shearing device of Sewing machines as claimed in claim 3, it is characterized in that, described moving assembly then comprises the roller that is located in the U-shaped intralamellar part, be connected in the inner prop of this roller and be socketed on the sleeve of the outside of this inner prop, and this inner prop and jacket casing are connected on this guide rod.

5, the needlework shearing device of Sewing machines as claimed in claim 4, it is characterized in that, described seat board be provided with for bolt wear the fixing hole that is connected this sleeve, and with this fixing hole be pivot and for bolt wear be connected this sleeve so that this seat board can be made the arcuate socket of swing with respect to sleeve.

6, the needlework shearing device of Sewing machines as claimed in claim 1 is characterized in that, described positioning cam arm is connected with spreader, and this seat board then is provided with and is socketed in the skewed slot of this spreader with the mobile orientation of controlling this seat board.

7, the needlework shearing device of Sewing machines as claimed in claim 1 is characterized in that, described supporting mechanism also comprises first extension spring, and the two ends of this first extension spring are connected on this seat board and the described Sewing machines body.

8, the needlework shearing device of Sewing machines as claimed in claim 1 is characterized in that, described supporting mechanism also comprises second extension spring, and the two ends of this second extension spring are connected on this support arm group and the described Sewing machines body.

9, the needlework shearing device of Sewing machines as claimed in claim 1, it is characterized in that, described support arm group comprises support arm that is connected in this seat board and the fixed block that is connected in this support arm, and the driving lever that this scissors driving group comprises the actuating arm that is connected in this weft cutter cam arm and is connected in this actuating arm and is articulated in this fixed block.

10, the needlework shearing device of Sewing machines as claimed in claim 9 is characterized in that, form on the described mobile blade two pairs should the driving lever bottom flange, can order about mobile blade with respect to this counteredge action by the swing of this driving lever.

11, the needlework shearing device of Sewing machines as claimed in claim 10, it is characterized in that, comprise that also the blade that is fixed in described body holds follow block, and hold in this and to form holding on follow block flange that should mobile blade to sheet, this flange towards this hold to the sheet direction against, do closed with respect to this counteredge and control this mobile blade.

12, the needlework shearing device of Sewing machines as claimed in claim 1 is characterized in that, described needlework scissors also comprises thread tension disc, and this thread tension disc is connected this mobile blade top, can temporaryly make fixing to it after needlework are cut off.

13, the needlework shearing device of Sewing machines as claimed in claim 1 is characterized in that, also comprises inductor, and this inductor is fixed on the described body, and this cam forms detecting part in addition, and this inductor is corresponding to this detecting part configuration.