CN1173089C

CN1173089C - Improved string cutter for sewing machine

Info

Publication number: CN1173089C
Application number: CNB011121939A
Authority: CN
Inventors: 顾飞龙
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-09-20
Filing date: 2001-03-30
Publication date: 2004-10-27
Anticipated expiration: 2021-03-30
Also published as: CN1344829A

Abstract

The present invention relates to an improved string cutter for a sewing machine, which mainly uses a cantilever group, the displacement of which can be precisely adjusted. A convex post below a left cantilever is directly arranged in a left long hole of a hooked lever arm, and a convex post of a right cantilever arm is arranged in a lug hole of a cutting knife arm, so the convex post can serve as a swinging supporting point of the knife cutting arm. Thus, the swinging torque is greatly reduced, and the load and the dynamic force of the swinging arm are reduced. The targets of change of traveling of a cutting string and the fine adjustment of a route are obtained, and the improved string cutter has characteristics of smoothness and demulcent performance, so the string cutting effect is increased. The disadvantages of loosening and non-true performance are effectively reduced, and the improved string cutter becomes the string cutter which has precise string cutting effect and practical effect.

Description

Improved string cutter for sewing machine

(1) technical field

The present invention refers in particular to a kind of special-purpose cable cutter new construction of Sewing machines that is applicable to chain stitch about a kind of improved string cutter for sewing machine.

(2) background technology

Be applicable to that the use in sewing machine cable cutter of chain stitch such as traditional the 4th, 098, No. 209 cases of United States Patent (USP) are an example; And the inventor has applied for the formerly also approved bulletin architecture advances that No. 2892012 case is promptly done at the aforesaid U.S. Patent case; See also shown in Figure 10ly, this cable cutter system is combined by plate body 61, cutter arm 62, intermediate plate 63, cutting knife 64, raker arm 65, raker 66 and swing arm 67; Wherein:

Plate body 61, its periphery have many locating holes 611, are positioned on the sewing machine table to cooperate screw 6111 to wear, and simultaneously, 61 last sides of plate body have a configured slot 612, and the rear end has a screw 6121 in the groove; And side also has a screw 613 in addition;

Cutter arm 62 has a through hole 621 in its back-end, locatees by being nested with an axle cap 6211 and cooperating a screw 6212 to wear into the screw 6121 of aforementioned plate body 61; Simultaneously, the rear end side has a guide groove 622, and this guide groove 622 is the strip of the differential of the arc, and its rear end wing rises; And interlude has two screws 623, and respectively there are two screws 624 and two through holes 625 in the front and back of front end;

Intermediate plate 63, its rear end have two through hole 631, wear through hole 625,631 by screw 632 and go into the front end below that the screw 6331 of stator 633 is positioned at cutter arm 62;

Cutting knife 64, its rear end have an elongated hole 641, wear and go into screw 624 through the through hole 6431 of pad 643 by screw 642, make cutting knife 64 be positioned at the front end top of cutter arm 62;

Raker arm 65, its rear end have a breach 651, and central sections has two elongated holes 652, simultaneously, be matched with elongated hole 652 front ends and be nested with an axle cap 6521, and wear into screw 623 by screw 6522, raker wall 65 is stacked on the cutter arm 62, and simultaneously, its front end has two screws 653;

Raker 66, rear end have two through hole 661, wear into screw 653 by screw 662, and raker 66 is fixed in the front end of raker arm 65, and raker 66 front ends have forward and backward hook part 663,664 respectively;

Swing arm 67, centre have a through hole 671, by being nested with an axle cap 672 and cooperating a screw 6721 to penetrate screw 613, will put wall 67 and be positioned on the plate body 61; Simultaneously, head end 673 enters the breach 651 of raker arm 65, and there is a through hole 674 at the rear of head end 673, it is equipped with a buttress shaft 675 and goes in the guide groove 622 of cutter arm 62, the top of this buttress shaft 675 has screw thread 6751 and the solid nut 676 of spiral shell, and the then sheathed slip ring 677 in below makes the slip ring 677 can be in guide groove 622 slippages; In addition, the rear end of swing arm 67 is then affixed with a drive member (not shown), and making swing arm 67 is fulcrum with screw 6721, and head end 673 removable suitable angular displacements.

As shown in figure 11, at the beginning of angular displacement is done in drive member drive swing arm 67, the slip ring 677 of swing arm 67 will be from the former wing end that is arranged in the guide groove 622 of cutter arm 62, wing to guide groove 622 plays place's front end, and drive cutter arm 62 by former askew status, be that fulcrum shifts into straightened condition with screw 6212; Simultaneously, the skew of cutter arm 62 also interlock 65 one-tenth straightened condition of raker wall placed on it.

Continue it, as shown in figure 12, in the angular displacement that swing arm 67 moves on, the slip ring 677 of swing arm 67 will move to the front end of guide groove 622 again, and in this process, cutter arm 62 does not have any action; Counter-example is, under the promotion of breach 651, slippage forward makes former elongated hole 652 front ends that are positioned at screw 6522 places to raker arm 65, moves the rear end into elongated hole 652 at the head end 673 of swing arm 67; The slippage forward of raker arm 65 then drives raker 66 and protrudes out forward, catches on relevant line body by forward and backward hook part 663,664.

Then, the angular displacement that swing arm 67 works are return, then driving raker arm 65 resets, and raker 66 is in retraction process, the cutting edge of forward and backward hook part 663,664 and cutting knife 64 interlocks and mistake, this has at raker 66 under the holding of intermediate plate 63, all the time with 64 one-tenth of cutting knifes by pasting, so the line body that cutting knife 64 can catch on raker 66 cut-out; At last, the location is return in swing arm 67, simultaneously, drives cutter arm 62 and resets to deflected condition with raker arm 65, and finish the action of tangent line.

By the enforcement of aforesaid structure and action, can directly drive raker arm 65 and cutter arm 62 starts respectively by swing arm 67, to improve the defective in the prior art.

But this structure is gone through long-term use for many years, in central some problem of still finding, as:

1. make fulcrum with screw 6212, make cutter arm 62 and collude, thread cutting device etc. swings, entire length, be that screw 6212 is that the buttress shaft 75 of fulcrum to 663,664 the length multiples in forward and backward hook part in swing arm 67 is to screw 6212, so the pushing torque of swing arm 67 will increase relatively, its power and loss are also significantly increased; As can be seen from Figure 13, the distance of A and B surpasses 1: 4.5, and promptly its application of force arm of force promotes with the vast scale that surpasses 1: 4.5.

2. make fulcrum with screw 6212, the amplitude of fluctuation at 663,664 places, then forward and backward hook part is also bigger, be used as to collude and hold and during the action of tangent line, outside the pause and transition in rhythm or melody sense that it stops, starting is big, also be easier to produce vibration and loss for parts, have the impairment parts life-span virtually or increase the situation that perplexs and take place.

3. only make fulcrum with screw 6212, then whole cutter arm 62 and on each element can't effectively finely tune its position or amplitude of fluctuation, the backguy during for tangent line, collude hold, practical operation such as cut-out has harmful effect to a certain degree.

4. protruding out very long knife bar 66 when carefully approaching and operating relatively is easy to generate vibration and influences raker and cut-out.

(3) summary of the invention

Main purpose of the present invention is to provide a kind of improved string cutter for sewing machine, reduces the swing of existing thread cutting device or pause and transition in rhythm or melody sense when stopping with this, and quite cunning is suitable to make line cut action, and can increase the service life of parts.

For achieving the above object, technical scheme of the present invention is: a kind of improved string cutter for sewing machine comprises plate body, cutter arm, raker arm and intermediate plate, cutting knife, raker and the swing arm commonly used that cooperates with them; This plate body periphery is provided with plate body is fixed in locating hole on the Sewing machines, the configured slot that wherein also has depression; One end of this cutter arm is inserted in the configured slot of cutter arm, and the other end is provided with hole and screw, and intermediate plate and cutting knife are arranged on this other end by described hole and described screw respectively; The raker arm is provided with left and right two elongated holes and a breach, and swing arm one end is inserted in the breach, and raker is arranged on this raker arm tail end; Also comprise the cantilever group, it comprise be individually fixed in plate body, have a left and right cantilever of projection down, one end of cutter arm has a lug that a hole wherein arranged, be provided with an elongated hole near the tail end place, cantilever projection down in a left side is inserted in the left elongated hole of raker arm, and the projection under the right cantilever inserts in the hole of lug of cutter arm the fulcrum as the cutter arm swing, and the projection in the elongated hole of the cutter arm inserted is arranged below the raker arm tail end.

(4) description of drawings

For technical scheme, creation characteristic, purpose and the effect that the present invention is used is easy to understand, be described with reference to the accompanying drawings as follows now:

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

Fig. 2 is a plan structure combination schematic diagram of the present invention;

Fig. 3 is another plan structure combination schematic diagram of the present invention;

Fig. 4 is an another plan structure combination schematic diagram of the present invention;

Fig. 5 is the combination of an a plan structure again schematic diagram of the present invention;

Fig. 6 is a cross-sectional view of the present invention;

Fig. 7 is another cross-sectional view of the present invention;

Fig. 8 is a cut-away section schematic diagram of the present invention;

Fig. 9 is that of the present invention overlooking implemented application of force schematic diagram;

Figure 10 is the three-dimensional exploded view of prior art;

Figure 11 is a plan structure schematic diagram of prior art;

Figure 12 is another plan structure schematic diagram of prior art; And

Figure 13 is the schematic diagram of the embodiment of prior art.

(5) specific embodiment

At first, see also shown in Figure 1ly, the present invention cooperates intermediate plate 63, cutting knife 64, raker 66 and swing arm 67 commonly used to combine by plate body 1, cutter arm 2, raker arm 3 and cantilever group 4.

See also shown in Fig. 1 to 5, plate body 1 periphery has several locating holes 11, in have and all have screw 131 in a configured slot 12 and two positioning runners, 13, two positioning runners 13 and pass cantilever group 4 back spiral shells for screws 132 and establish.

Cutter arm 2 one ends just can be inserted in the configured slot 12, and are provided with a hole 21 and establish projection 210 for group, and end then is provided with elongated hole 22 in addition, and tail end then is respectively equipped with hole 23 and screw 24 is established intermediate plate 63 and cutting knife 64 for group.And the hole is provided with lug 25 outside 21 right sides in addition, has hole 26 in this lug 25.

Raker arm 3 is provided with the right side, left

elongated hole

31,32 and a breach 33, is provided with bending segment 321 in left elongated hole 32 1 ends, and tail end is provided with screw 34 and establishes raker 66 for group, has a projection 35 in screw 34 and just can insert in the elongated hole 22 of cutter arm 2.

Cantilever 4 is that right,

left cantilever

41,42 is formed, utilize flat segments 411,421 to insert in two positioning runners 13, again by going in the screw 131 behind screw 132 perforatings 412,422, other holds the next projection 413,423 that is installed with, wherein projection 423 places left elongated hole 32, right cantilever 41 projections 413 place in the hole 26 of cutter arm 2 lugs 25, make cutter arm 2 with this projection 413 as fulcrum (seeing also shown in Fig. 2,6 to 8).

When pine a little moves back screw 132, make right cantilever 41 or left cantilever 42 do the fine setting of front and back position, this operation is quite easy to be certain again, to change swing position of the fulcrum or the amplitude of oscillation and the course thereof etc. of cutter arm 2, as actual tangent line adjustment.(seeing also shown in Fig. 2,6 to 8).

Please consult shown in Figure 2ly again, projection 423 is positioned near the bending segment 321 of left elongated hole 32, is the tangent line armed state; When swing arm 67 continued to promote raker arms 3, projection 423 left bending segment 321 fully and left elongated hole 32 in (as shown in Figure 3), then whole thread cutting device is all towards preceding (below the figure), and preceding hook part 663 has been positioned near suture needle 8 places; Swing arm this moment 67 continues to advance, and when making projection 423 be positioned at left elongated hole 32 stage casings (as shown in Figure 4), preceding hook part 663 is before suture needle 8; When swing arm 67 is pushed into when fixed point (as shown in Figure 5), forward and backward hook part 663,664 all surpasses the left side of suture needle 8, when treating that swing arm 67 pushes back, the suture of suture needle 8 can be colluded to the right and hold and be pulled to cutting knife 64 places and cut off.

Comprehensive the above, the structure of prior art of the present invention is compared, and has following advantage, as:

1. see also shown in Figure 9, whole cutter arm 2 is made fulcrum with the projection 413 of right cantilever 41, make its left-hand end and on cut, collude devices such as line swing is arranged the time, significantly dwindle the moment of swing, can effectively slow down the starting in when swing and the pause and transition in rhythm or melody sense when stopping, thread cutting action is quite sliding mild along reaching, to improve the tangent line quality.

Since the swing fulcrum of cutter arm 2 significantly move forward, make projection 413 to preceding hook part 663 with from B with the application of force of putting and stressed moment is relative dwindles to the stressed bending of bending segment 321, for the effect that providing of power alleviates relatively, can be comparatively laborsaving.

3. cutter arm 2 is except that the moment that reduces swing, and the fulcrum of its swing also can utilize the front and back displacement of right cantilever 41 to adjust, and cooperates the adjustment of right cantilever 42, make tangent line advance and relative adjustment also can be done in the path, the tangent line operation more can be corresponded to actual needs.

4. the significantly swing and the raker arm 3 of displacement about whole, have the right side, left two

elongated holes

31,32 and projection 35 can do more than 3 against and guiding, can be more smooth-going and gentle when making its swing and displacement, and do not have slack and undisciplined untrue situation and take place.

Claims

1. an improved string cutter for sewing machine comprises plate body, cutter arm, raker arm and intermediate plate, cutting knife, raker and the swing arm commonly used that cooperates with them;

This plate body periphery is provided with plate body is fixed in locating hole on the Sewing machines, the configured slot that wherein also has depression;

One end of this cutter arm is inserted in the configured slot of cutter arm, and the other end is provided with hole and screw, and intermediate plate and cutting knife are arranged on this other end by described hole and described screw respectively;

The raker arm is provided with left and right two elongated holes and a breach, and swing arm one end is inserted in the breach, and raker is arranged on this raker arm tail end; It is characterized in that,

Also comprise the cantilever group, it comprise be individually fixed in plate body, have a left and right cantilever of projection down,

One end of cutter arm has a lug that a hole wherein arranged, and is provided with an elongated hole near the tail end place, and left cantilever projection is down inserted in the left elongated hole of raker arm, and the projection right cantilever under inserts the fulcrum of swinging as cutter arm in the hole of lug of cutter arm,

Projection in the elongated hole of the cutter arm inserted is arranged below the raker arm tail end.

2. improved string cutter for sewing machine as claimed in claim 1 is characterized in that, plate body is provided with two positioning runners near described configured slot, and the flat segments of left and right cantilever is inserted wherein by screw respectively, adjusts screw and can make the cantilever group do the front and back displacement.