CN201071438Y

CN201071438Y - Automatic stitching mechanism of sewing machine

Info

Publication number: CN201071438Y
Application number: CNU2007200724973U
Authority: CN
Inventors: 叶昆忠
Original assignee: CHEESIANG SEWING MACHINE (SHANGHAI) Co Ltd
Current assignee: CHEESIANG SEWING MACHINE (SHANGHAI) Co Ltd
Priority date: 2007-07-16
Filing date: 2007-07-16
Publication date: 2008-06-11
Anticipated expiration: 2017-07-16

Abstract

The utility model relates to a sewing machine automatic thread cutting mechanism, and mainly comprises such components as a base plate, a thread clamping set and a cutting knife set and etc; the base plate set is arranged on the bottom end surface of a needle pad, so as to provide an alignment datum between the thread clamping set and the cutting knife set; the thread clamping set makes for supporting for ends of lower sewing thread; the cutting knife set is composed of a fixed cutting knife and a movable cutting knife set, so that the fixed cutting knife can be mounted on the base plate, and meanwhile, the cutting knife can be fixed on the base plate via a shaft. In actual operation, the movable cutting knife is controlled with the thread cutting connecting rod, so as to screw out and tick the upper and lower sewing threads; moreover, in returning stroke, the movable cutting knife matches with the fixed cutting knife, so that the upper and lower sewing threads can be cut off simultaneously. The utility model integral has the advantages of smooth action and high speed without blockage; and meanwhile, in both assembling and maintenance, the integral elements on the cutting knife set have the advantages of simple and easy operation. Therefore, for industrial sewing machines, the utility model can take effects in shortening sewing stroke but improving working efficiency.

Description

Sewing machines automatic tangent mechanism

Technical field

The utility model relates to a kind of Sewing machines automatic tangent mechanism, relates in particular to a kind ofly the upper and lower suture of Sewing machines to be utilized a moving cutting tool arrest the automatic tangent mechanism that cuts synchronously.

Background technology

General Sewing machines must be shifted out working substance by the operator, and utilize manual mode that upper and lower suture is cut off respectively when each sewing stroke termination by the presser feet place, make working substance break away from the yoke of Sewing machines suture fully.This traditional job step can make whole sewing operation time-histories reduce, because when each sewing stroke termination shifts out the sanction line with working substance, must will go up suture scissors earlier at the upper surface of working substance has no progeny, again the working substance turn-over is cut off down suture, according to such words, cut off, turn-over, the action of cutting off must constantly show behind each sewing stroke, it certainly will have a strong impact on the fluency of operation, thereby causes operating efficiency to promote.

Summary of the invention

The purpose of this utility model provides a kind of can colluding automatically and catches the also automatic tangent mechanism of severing synchronously of upper and lower suture, and the time-histories of each sewing stroke just can be quickened to finish like this, and then promotes operating efficiency effectively.

For solving the problems of the technologies described above, the utility model mainly comprises: a substrate, it is fixedly installed on the plate body of Sewing machines needle plate bottom face, offer a through hole in these plate body central authorities, side offers several lockholes around this through hole, passes lockhole by fixed screw and revolves and be locked to needle plate and the smooth needle plate bottom face that is consolidated in; The clamp group, it is made of assemblies such as shell fragment, pressing plate, Upper gasket and lower gaskets, mutual storehouse is locked in substrate to each assembly according to the order of lower gasket, shell fragment, pressing plate, Upper gasket, make the overhanging pressure arm roof pressure of pressing plate in the overhanging elastic arm of shell fragment, make the shell fragment bottom side be subjected to the lower gasket bracketing and form a suitable spacing with substrate; The cutting knife group, it is made up of a fixed cutting tool and a moving cutting tool, the fixed cutting tool lock is set to be positioned on the substrate, make moving cutting tool be provided with an axis hole and a pivot hole in the stiff end of cutter hub one side, collude groove and second and collude groove and another open end is provided with first, make the axis hole movable axis of moving cutting tool be located at substrate, this pivot hole then with the tangent line connecting rod pivot of thread-cutting driving device.Utilize above-mentioned member, make moving cutting tool adhere on the fixed cutting tool, and shell fragment compression plate roof pressure and force in moving cutting tool, make the tangent line connecting rod lead moving cutting tool to produce swing action and outwards back-out, make first to collude groove and second and collude groove and collude groove down suture and last suture synchronously individually, and cooperate fixed cutting tool to produce a shearing operation with the swing backhaul of moving cutting tool with the track of independently working separately.

As a kind of preferred structure of the present utility model, revolving lock on the described Upper gasket has an adjustment screw to contact at the overhanging pressure arm of pressing plate.

As a kind of preferred structure of the present utility model, the cutter hub of described moving cutting tool is hook solid.

Further, as a kind of preferred structure of the present utility model, described moving cutting tool is concaved with the conduit of an oblique sinking in the bottom land place of first groove.

The utility model is owing to adopted above-mentioned technical scheme, make it compared with prior art, have following advantage and good effect: because the utility model is when carrying out the tangent line operation, moving cutting tool is to lie in the single swing stroke, being about to upper and lower suture colludes in the lump and catches tangent line, so the molar behavior smoothness, rapidly, do not have and block up, and no matter the integrated member of cutting knife group is in assembling or maintenance, the easy advantage of operation is all arranged, so for industrial sewing machine, have the effect of reduction sewing stroke, lifting operating efficiency.

Description of drawings

To embodiment of the present utility model and in conjunction with the description of its accompanying drawing, can further understand the purpose of this utility model, specific structural features and advantage by following.Wherein, accompanying drawing is:

Fig. 1 is a perspective exploded view of the present utility model.

Fig. 2 is three-dimensional combination schematic diagram (looking up state) of the present utility model.

Fig. 3 is the generalized section of Fig. 2.

Fig. 4 is the schematic perspective view of back-out state for moving cutting tool of the present utility model.

Fig. 5 is the planar structure schematic diagram of moving cutting tool of the present utility model.

Fig. 6 is the A-A cutaway view among Fig. 5.

The specific embodiment

As shown in Figures 1 and 2, the utility model Sewing machines automatic tangent mechanism mainly is made of assemblies such as a substrate 1, a clamp group 2 and cutting knife groups 3, wherein:

Substrate 1, be one to be fixedly arranged on the plate body of Sewing machines needle plate 10 bottom faces, offer a through hole 11 in these plate body central authorities, side offers

several lockholes

12,13,14,15 around through hole 11, passing lockhole 12 by fixed screw 16 revolves and is locked to needle plate 10, make substrate 1 can fixed flat card in needle plate 10 bottom faces, again because lockhole 12 offer and be strip, so substrate 1 can be adjusted the fixed position of itself and needle plate by it;

Clamp group 2, provide down the assembly that suture the end of a thread grips, comprise shell fragment 21, pressing plate 22, assemblies such as Upper gasket 23 and lower gasket 24 constitute, make each assembly according to lower gasket 24, shell fragment 21, pressing plate 22, the order of Upper gasket 23 and mutually storehouse be locked in the lockhole 13 of substrate 1, and revolving lock on this Upper gasket 23 in addition has one to adjust screw 231, make the end of adjusting screw 231 contact at the overhanging pressure arm 221 of pressing plate 22, and pressure arm 221 roof pressures are in the overhanging elastic arm 211 of shell fragment 21, because of this shell fragment 21 and the another side that pressing plate 22 attaches are subjected to 24 bracketings of lower gasket, make elastic arm 211 and substrate 1 form a suitable spacing, utilized this spacing to maintain the elastic force that presses down of an appropriateness by making shell fragment 21 like this;

Cutting knife group 3, be one to provide on the Sewing machines, the disconnected assembly of cutting of following suture, it is made up of a fixed cutting tool 31 and a moving cutting tool 32, this moving cutting tool 32 comes priming by the tangent line connecting rod 4 of thread-cutting driving device, make moving cutting tool 32 be provided with an axis hole 321 and a pivot hole 322 in the stiff end of its shape such as hook solid cutter hub one side, collude groove 323 and second and collude groove 324 (as shown in Figure 5) and the scratching part of the other end (open end) is provided with first, fixed cutting tool 31 locks are set to be positioned on the lockhole 14 of substrate 1, movable axis is located on the lockhole 15 by axis hole 321 for 32 of moving cutting tools, and utilizing tangent line connecting rod 4 to be articulated in pivot hole 322 leads moving cutting tool 3 to produce shuttle swing action, make first to collude groove 323 and second and collude groove 324, make fixed cutting tool 31 and moving cutting tool 32 produce an action of cutting out with the track cutting edge by fixed cutting tool 31 in regular turn of independently working separately.

Utilize above-mentioned member, make the scratching part of moving cutting tool 32 adhere on the fixed cutting tool 31, and pressure arm 221 roof pressures of elastic arm 211 compression plates 22 of shell fragment 21 and forcing in (as shown in Figure 3) on the moving cutting tool 32, after treating that tangent line connecting rod 4 is subjected to the thread-cutting driving device interlock, promptly get and draw moving cutting tool 32 generation swing actions, make the scratching part of moving cutting tool 32 open ends outwards screw out (as shown in Figure 4), make first to collude groove 323 and second and collude groove 324 and can collude respectively synchronously and catch down suture and last suture, and will go up in the swing backhaul of moving cutting tool 32, following suture is sent towards the cutting edge of fixed cutting tool 31 in the lump, the operation of automatic tangent is so promptly finished in severing.

Further, for the end of a thread that makes down suture still can carry out in next sewing stroke after severing smoothly, the utility model utilizes the incompatible action of carrying out clamping the end of a thread that matches of clamp group 2 and moving cutting tool 32, catch down after suture is delivered to fixed cutting tool 31 tangent lines in colluding for making first of moving cutting tool 32 collude groove 323, the end of a thread of this time suture can be come off by blade portion, so this first colludes groove 323 is concaved with an oblique sinking in its trench bottom place conduit 3231 (as Fig. 4 and shown in Figure 6), utilize the conduit 3231 of this oblique sinking, make down suture when passing through the edge of a knife of fixed cutting tool 31, must keep a end of a thread that is complementary with conduit 3231 length, make the end of a thread gripped by moving cutting tool 32 and shell fragment 21.

Moreover, because of moving cutting tool 32 movable axis are located on the lockhole 15, so must be adjusted control for its open end and fixed cutting tool 31 applying degree each other, sharp degree when cutting to keep upper and lower suture to break, the utility model is to utilize the pressing plate 22 of shell fragment 21 top end faces to come roof pressure shell fragment 21, and utilize and adjust the dynamics that screw 231 adjustment control pressing plates 22 press down, make shell fragment 21 can have the applying degree that a preferable elastic force comes pushing tow moving cutting tool 32 and fixed cutting tool 31.So this clamp group 2 is except that the effect with clamping the end of a thread, it also has the effect of auxiliary cutting knife group 3 smooth tangent lines, so be an excellent design with double utility.

Though the utility model is illustrated hereinbefore according to preferred embodiment of the present utility model; but this does not represent that scope of the present utility model is confined to above-mentioned structure, if by structure that claim of the present utility model covered all within protection domain.Those skilled in the art can be developed the equivalent substitution structure that at an easy rate after reading above-mentioned explanation, and these equivalent alternative structure are also within the scope that this case requires.

Claims

1. a Sewing machines automatic tangent mechanism is characterized in that, mainly comprises:

One substrate, it is fixedly installed on the plate body of Sewing machines needle plate bottom face, offers a through hole in these plate body central authorities, and side offers several lockholes around this through hole, passes lockhole by fixed screw and revolves and be locked to needle plate and the smooth needle plate bottom face that is consolidated in;

The clamp group, constitute by assemblies such as shell fragment, pressing plate, Upper gasket and lower gaskets, mutual storehouse is locked in substrate to each assembly according to the order of lower gasket, shell fragment, pressing plate, Upper gasket, make the overhanging pressure arm roof pressure of pressing plate in the overhanging elastic arm of shell fragment, make the shell fragment bottom side be subjected to the lower gasket bracketing and form a suitable spacing with substrate;

The cutting knife group, form by a fixed cutting tool and a moving cutting tool, the fixed cutting tool lock is set to be positioned on the substrate, make moving cutting tool be provided with an axis hole and a pivot hole in the stiff end of cutter hub one side, collude groove and second and collude groove and another open end is provided with first, make the axis hole movable axis of moving cutting tool be located at substrate, this pivot hole then with the tangent line connecting rod pivot of thread-cutting driving device;

Described moving cutting tool adheres on the fixed cutting tool, and shell fragment compression plate roof pressure and force in moving cutting tool, the tangent line connecting rod leads moving cutting tool to produce the swing action and outwards screws out, first colludes groove and second colludes groove and colludes groove down suture and last suture synchronously respectively with the track of independently working separately, and cooperates fixed cutting tool to produce a shearing operation with the swing backhaul of moving cutting tool.

2. Sewing machines automatic tangent as claimed in claim 1 mechanism is characterized in that: revolving lock on the described Upper gasket has one to adjust screw and contact at the overhanging pressure arm of pressing plate.

3. Sewing machines automatic tangent as claimed in claim 1 mechanism, it is characterized in that: the cutter hub of described moving cutting tool is hook solid.

4. Sewing machines automatic tangent as claimed in claim 1 mechanism, it is characterized in that: described moving cutting tool is concaved with the conduit of an oblique sinking in the bottom land place of first groove.