CN1036410C

CN1036410C - Sewing machine

Info

Publication number: CN1036410C
Application number: CN93107420A
Authority: CN
Inventors: 赵舜培
Original assignee: YIQIANG METAL MASTIC PRODUCT CO Ltd
Current assignee: YIQIANG METAL MASTIC PRODUCT CO Ltd
Priority date: 1992-06-23
Filing date: 1993-06-23
Publication date: 1997-11-12
Anticipated expiration: 2013-06-23
Also published as: GB2268940A; GB9213316D0; CN1082640A; GB2268940B

Abstract

Work is fed in a sewing machine by means, which may be the needle (29) or presser foot (37) acting on the workpiece from above. As shown the needle bar (25) is pivotable as well as axially movable and a drive crank engaging a follower (33) on the needle bar displaces the latter pivotally to feed the workpiece, the needle bar being returned by spring bias. To form chain stitches a looper (46) is pivoted by the needle and returns under spring bias to seize the loop. The needle and presser foot may be provided in a module. The sewing machine may be a hand-held machine. The needle may also have lateral motion for zig-zag stitching.

Description

Sewing machines

The present invention relates to Sewing machines, particularly relate to a kind of improved novel sewing machine that the feed dog device is not set.

Existing sewing machine generally includes a main body, and this main body has upper and lower two parts, the article by sewing up between these two parts; A sewing mechanism wherein has a sewing needle and a presser feet, has spring on the described presser feet, and presser feet applies bias voltage by spring; A transmission mechanism, it drives the upper and lower motion of sewing needle, thereby carries out sewing operation; And a table top, it is made of the lower body part branch, and is provided with pin hole on table top, the article of sewing up are pressed on this table top by presser feet, be located at the table top below and also have a feed dog device, it is in the Sewing machines operating process, and the article that will sew up are sent to synchronously.Above-mentioned habitual Sewing machines has shortcomings such as complex structure.

For overcoming the shortcoming that above-mentioned existing Sewing machines structure exists, the present invention improves Sewing machines, the present invention seeks to propose a kind of novel sewing machine, it is not provided with the feed dog device that advances fabric, the Sewing needles swing is reached send the effect that to sew up article synchronously to, simplified the general structure of Sewing machines greatly, reach simple in structure and adopt, easily manufactured, operate terse effect.

According to the present invention, a kind of such Sewing machines is provided, it comprises: one has top and lower part, thus between two parts, form one can be by will sewing up article the main body of sewing area; One contains a sewing needle and a presser feet, and by the sewing mechanism of the top of main body supporting, described presser feet is elastically biased toward downwards by spring; One be positioned at main body be used for driving sewing needle axially up and down the motion so that carry out the transmission mechanism of sewing operation; With a table top that comprises a pin hole that constitutes by the lower body part branch, when driving sewing needle by presser feet and into and out of pin hole, the described article that will sew up are pressed against on the table top by presser feet, so that carry out sew application, it is characterized in that, also comprise travel mechanism, it is under the situation that does not adopt the feed dog device, carry out during the sewing operation, in order to send described article to, axially upwards transmission and presser feet remain in extreme lower position simultaneously, the also swing backward of described sewing needle that is driven by transmission mechanism at sewing needle.

Best, above-mentioned travel mechanism is driven by above-mentioned transmission mechanism in sewing work and does moving backward at least, advances so that drive above-mentioned article.

Be more preferably, above-mentioned travel mechanism is driven, is worked in the above-mentioned article mode that just makes a round trip that whenever takes a step forward by above-mentioned transmission mechanism in sewing work.

In a specific structure, transmission mechanism contains a member of cranking arm that is used for driving travel mechanism.

Preferably, travel mechanism constitutes the part of sewing mechanism.

In a most preferred embodiment, travel mechanism is the sewing needle in the sewing mechanism.

In another most preferred embodiment, travel mechanism is the presser feet in the sewing mechanism.

Best, the sewing needle of formation travel mechanism or presser feet are supported and move axially and rotate.

In an ad hoc structure, sewing mechanism contain fix with respect to the sewing needle of travel mechanism or presser feet and to have one be the driven member of the passage that extends of horizontal direction basically, above-mentioned passage engages so that drive transmission with the member of cranking arm, it has a blind end, and above-mentioned sewing needle or presser feet are rotated.

Above-mentioned Sewing machines also can have a bottom that is arranged in main body and table top pin hole under the cover line components, be used for one of clamping just by the coil of pin band needle passing hole.

Above-mentioned cover line components is rotatably support preferably, so that at the clip position of the above-mentioned coil of clamping with unclamp subsequently between the disengaged position of above-mentioned coil and move.

Best, above-mentioned cover line components is elastically biased toward to clip position, and can make it move on to disengaged position from clip position by the sewing needle that passes the table top pin hole.

The cover line components can comprise a pinhock structure that is used for the above-mentioned coil of clamping.

Preferably a kind of assembly that can remove of sewing mechanism from the main body of Sewing machines.

Be described more specifically the present invention below with reference to accompanying drawing (only as an example), in the accompanying drawing:

Fig. 1 is the perspective view of an embodiment of Sewing machines of the present invention;

Fig. 2 is the perspective view of drive gear of sewing machine shown in Figure 1;

Fig. 3 is the perspective view of the sewing mechanism of Sewing machines shown in Figure 1;

Fig. 4 A and 4B are the side views of sewing mechanism shown in Figure 3, represent that respectively its presser feet is in when reducing and the relative position when raising;

Fig. 5 A and 5B are the perspective views that part is analysed and observe, and represent that transmission mechanism shown in Figure 2 drives the method for sewing mechanism shown in Figure 3 on two different transmission direction;

Fig. 6 A～6F is the side view that expression transmission mechanism shown in Figure 2 acts on the order of the drive state on the sewing mechanism shown in Figure 3;

Fig. 7 A and 7B represent the needle tracking that the sewing needle of sewing mechanism shown in Figure 3 forms on workpiece under the gearing of transmission mechanism shown in Figure 2;

Fig. 8 is the perspective view of the cover line mechanism of Sewing machines shown in Figure 1, and it is what install with the associated working of the sewing needle of sewing mechanism shown in Figure 3;

The side view of the order of duty when Fig. 9 A～9F is expression transmission mechanism shown in Figure 2, sewing mechanism shown in Figure 3 and cover line mechanism associated working shown in Figure 8;

The order of duty when Figure 10 A～10K represents the sewing needle of sewing mechanism shown in Figure 2 and cover line mechanism associated working shown in Figure 8.

At first with reference to figure 1～3, there is shown the present invention and Sewing machines 10 below, it is by a main body 11 of being made up of pedestal 12 and head 13.Pedestal 12 is box, and it has a sewing table top 14, and a pin hole 43 is arranged in the table top 14.Head 13 falls L shaped, it from pedestal 12 1 end 13A extend upward and then lateral extensometer to the relative other end of pedestal 12, and end at the free end 13B that is positioned at pedestal 12 tops, thereby between them, formed a sewing area.

Above-mentioned Sewing machines 10 also has a transmission mechanism 15 and a sewing mechanism 16, and they lay respectively at head 13 relative two ends 13A and 13B.

Can clearly be seen that from Fig. 2 slow down big pinion 20 and crown wheel 21 that is fixedly mounted on the axle head 17A of the motor 18, that transmission mechanism 15 drives axle head 17A by the power transmission shaft 17 with opposite end 17A and 17B, by transmission output pinion 19 formed.Be provided with a handwheel 53 in the end of axle head 17A, it is exposed at the outside of head 13, can be used for by hand turning cylinder 17.Axle head 17B extend in the

sewing mechanism

16, and 22 engages with it by having radially cranking arm of an axial pin 23 on the free end.

Can clearly be seen that from Fig. 3 sewing mechanism 16 has a vertical cuboidal outer cover 24, a sewing needle assembly 25 and a presser foot component 26.Sewing needle assembly 25 is by shank 27, cross bar 28 and a sewing needle 29 of stretching from shank 27 bottoms of crossing shank 27 and casting out with its integral body.Shank 27 usefulness axle journals supportings also can be passed outer cover 24 and vertically slide, and cross bar 28 then passes the square aperture 30 on 15 the side 24A from outer cover 24 towards transmission mechanism and is exposed at the outside of outer cover 24.Cross bar 28 has the groove 31 that extends along its body, groove 31 is also towards transmission mechanism 15, and it has a blind end 32 and an openend 33, and openend 33 does not arrive cross bar 28 respective end portions, cross bar stretches out forward from the end 13B of main body top band opening, as a thread take-up tension lever 34.As shown in the figure, the width of the general outer cover 24 with a side 24A who is with opening of the length of groove 31 equates.

As showing of Fig. 4 A and 4B, presser foot component 26 is by presser bar 35, axially extending integral stem 36 and the presser feet 37 that is positioned at presser bar 35 bottoms are formed from the top of presser bar 35.Bar 35 and bar 36 are by the axle journal supporting and can pass outer cover 24 vertical slip, and they are by the helical spring 38 that is arranged on the interior bar 36 of outer cover 24 and applies power of enforcement between bar 35 and outer cover roof fexible bias pressure in addition downwards.Presser foot component 26 also has a normally L shaped presser feet handle 39, and presser feet 37 is used for raising.Presser feet handle 39 has a inner, and this end is provided with a side pin 40 in the blind hole 41 on the adjacent side that is hinged on presser bar 35, and therefore, presser feet handle 39 engages rotationally with presser bar 35.The other end of presser feet handle 39 is exposed at the back of head end 13B, rotate it for the user between the upper and lower position, when it is in when the next, presser feet 37 drops on the sewing table top 14 (Fig. 4 A), when it is in when upper, presser feet 37 is from table top 14 raise (Fig. 4 B).

Fig. 5 A and 5B clearly show that the connected structure of 16 of transmission mechanism 15 and sewing mechanisms, and wherein, the pin 23 of cranking arm of transmission mechanism 15 is slidably engaged within the groove 31 in the cross bar 28 of sewing mechanism 16.When power transmission shaft 17 rotates, crank arm 22 and sell 23 and just rotate, thereby make sewing needle assembly 25 enter reciprocating motion, generally be the reciprocating motion of doing perpendicular to outer cover 24.In each cycle of rotation, the pin 23 of cranking arm is blind end 32 certain hours (Fig. 5 B) of collision slot 31, thereby makes whole sewing needle assembly 25 instantaneous swings backward.Shank 27 is elastically biased toward under the effect of spring 42 and enters vertical normal sewing position (Fig. 5 A) forward.Obviously, in case the pin 23 of cranking arm leaves the blind end 32 of groove, spring 42 just plays the effect that makes sewing needle 29 get back to the upright position.

Fig. 6 A～6F shows sewing needle assembly 25 in the circulation and cranks arm 22 and the work and the relative position thereof of pin 23 by the transmission that the inhour of the method shown in the arrow A among the figure is rotated.In Fig. 6 A, the pin 23 thereby also be that sewing needle assembly 25 is in the highest position of cranking arm.When the pin 23 of cranking arm rotated, sewing needle assembly 25 moved down (shown in Fig. 6 B) immediately, and at this moment, the pin 23 of cranking arm is freely mobile along the openend 33 of the groove 31 of cross bar 28.Fig. 6 C represents that sewing needle assembly 25 takes minimum position to by the pin 23 of cranking arm.When cranking arm pin 23 when upwards rotate minimum position, sewing needle assembly 25 begins to move up.When the blind end 32 of the pin 23 bump cross bar grooves 31 of cranking arm, the sewing needle assembly no longer just moves up, but also the intersection point of the active force cast-over bar 27 that overcomes spring 42 (not shown) and outer cover 24 roofs rotates backward (shown in Fig. 6 D).Fig. 6 E represent to crank arm pin 23 thereby also be that sewing needle assembly 25 is in rearmost position.When the pin 23 of cranking arm further upwards rotated by this rearmost position, sewing needle assembly 25 was being got back to original upright position (shown in dotted line among Fig. 6 F) immediately under the effect of spring 42, and this position is equivalent to the position shown in Fig. 6 A.

Should be understood that sewing needle 29 moves in other words along a vertical plane on both direction, that is to say, move along a Z axle (vertically upward or downwards) with along a Y-axis (backward or forward).

During use, make presser feet 37 drop to workpiece 44 (article that will make) and go up it is pressed on the table top 14 so that carry out sewing operation, Fig. 7 A represents the motion track to sewing needle 29 in each sewing circulation of workpiece 44.Shown in Fig. 6 A～6F, crank arm 22 and pin 23 go to downwards from the most preceding position arrive last position before (at least one complete cycle of Fig. 6 B～6E), sewing needle 29 through presser feet 37 following, pass workpiece 44 again and enter in the pedestal 12, in this course, when upwards withdrawal of sewing needle 29 1, swing (Fig. 6 D and 6E) backward just instantaneously, thus keep with situation that workpiece engages under make workpiece 44 take a step forward (needle gage).The pressure of 37 pairs of workpiece 44 of presser feet mixes up in advance, and pressure just is unlikely to too big and hinders giving of workpiece like this.Fig. 7 B is illustrated in the track of pin in each circulation of sewing process.Obviously, the working cycles of mentioning just now is repeatably, so that finish sewing/stitching work continuously.

Have slightly among the embodiment of change one,, needle gage can be adjusted by the user by a kind of mechanism of groove 31 along sealing (the ending in other words) position of cross bar 28 that be used to change is set.

When Sewing machines 10 designs of the present invention were used for eyelet, it also was provided with a cover line mechanism 45 (as shown in Figure 8) under table top 14.Cover line mechanism 45 has a pedestal 48 that has the cover line device 46 and a rotatably support axle 47 of integral shaft 47 and overlap line device 46.Cover line device 46 be arranged in sewing pedestal 14 pin hole 43 under, and apply clockwise fexible bias pressure shown in arrow B among the figure by the helical spring 49 on axle 47 1 ends.Cover line device 46 has the first inclined-plane 50A, the second inclined-plane 50B and a whole pinhock 52.

Below with reference to Fig. 9 A～9F, there is shown sewing needle assembly 25, crank arm 22, pin 23 and cover line device 46 be corresponding to work and relative position in the program shown in Fig. 6 A～6F.Beginning, sewing needle 29 is passed down through hole 43, first leaning against with a low-angle on the first inclined-plane 50A that overlaps the line device and towards the second inclined-plane 50B (Fig. 9 A and 9B) that overlaps the line device, then by the first inclined-plane 50A of cover line device, the second inclined-plane 50B of bump cover line device more subsequently, thereby make cover line device 46 turn to the extreme lower position that arrives it by the counter-clockwise direction shown in the arrow C among Fig. 9 C.When sewing needle 29 1 moves up, overlap line device 46 and just discharge gradually, then, on the home position of getting back to it under the effect of spring 49 (Fig. 9 A), at this moment, cover line device no longer engages with sewing needle 29.To 9F, cover line device 46 keeps resting positions motionless from Fig. 9 D, and sewing needle assembly 25 crank arm 22 and the effect of pin 23 under, to swing backward with reference to the described identical mode of figure 6D～6F is instantaneous with top.

Figure 10 A～10K clearly show that the program of associated working between the sewing needle 29 that overlaps line device 46 and be installed with line 51.The sewing needle 29 that has line 51 is passed down through hole 43, cover line device 46 is rotated, shown in Figure 10 A and 10B.When cover line device 46 since sewing needle 29 move up and when getting loose gradually, just hook line 51 (Figure 10 C), and when returning original resting position, formed the coil 51A (Figure 10 D) of a line 51 from the extreme lower position of Figure 10 B with whole pinhock 52.When the next one that Figure 10 E is illustrated in sewing needle 29 moved down, it passed the coil 51A of clamping with next section of line 51, meanwhile with a low-angle lean against, and the first inclined-plane 50A by cover line device.Sewing needle 29 leans against and has guaranteed on the first inclined-plane 50A of cover line device that it can not miss coil 51A, because inclined-plane 50A is one with the pinhock 52 that cover line device 46 passes the coil 51A of clamping.

When sewing needle 29 1 its extreme lower positions of arrival, the coil 51A of first front clamp is decontroled, shown in Figure 10 F.In case sewing needle 29 leaves its extreme lower position, the pinhock 52 of cover line device 46 hooks second coil 51B (shown in Figure 10 G and 10H) of line 51 again, and is last, pins first coil 51A by above-mentioned second coil 51B.After sewing needle 29 passes second coil 51B, move downward in an identical manner again and form the 3rd the coil 51C (Figure 10 I) of line 51, and in next one circulation, pass the 3rd coil 51C again and form the 4th coil 51D (Figure 10 J), and so on, pin previous coil by a back coil, at last, on workpiece 44, formed a kind of chain-type stitch, shown in Figure 10 K.

As can be seen, sewing needle mechanism 25, the sewing needle 29 of more specifically saying so sews up and progressively advances/give workpiece 44 in the motor synchronizing mode.In fact, this synchronism is intrinsic, because sewing needle 29 is used for carrying out two kinds of relevant work: sew up and work feed, and in existing sewing machine, these two kinds work the former finish by sewing needle, the latter then by the identical transmission mechanism Synchronous Transmission of a kind of usefulness, independently feed dog mechanism finishes.

Owing to do not have this feed dog mechanism and relevant transmission system, the structure of transmission mechanism 15 and manufacturing are much just simple, the more important thing is, the pedestal 12 of Sewing machines 10 and head 13 can link together simply and not need to provide condition for any transmission between them engages, because transmission mechanism 15 is placed in 13 li of heads fully.

In addition as can be seen, the sewing mechanism 16 of Sewing machines 10 of the present invention makes an independently assembly, and like this, manufacturing and assembling are just more convenient.The installation of sewing assembly is fairly simple, only it need be engaged into cross bar 28 and cranks arm and then can between the pin 23.

Should see that in different embodiment, the presser foot component of sewing mechanism can be made instantaneous ground backward and move forward, so that replace sewing needle to give workpiece.

Should see that also Sewing machines of the present invention can be made manual Sewing machines.

In a kind of more advanced embodiment, the sewing needle assembly of Sewing machines or presser foot component are designed under the drive of transmission mechanism, not only can be backward and move forward and give workpiece, but also can form a kind of jagged or interrupted jagged needle tracking or embroider out a pattern to two side shiftings.In this Sewing machines, the sewing needle assembly can be moved along three directions (solid) or x-y-z direction (or coordinate) by drive.This Sewing machines can have be used for controlling sewing needle assembly moving in the x and y direction, independently cam drive and one are used for upper and lower mobile sewing needle assembly, the separate transmission mechanism to sew.This Sewing machines also can have memory mechanism, is used for storing control instruction, is the bearing data of storing the selected moving direction of sewing needle assembly at least.This Sewing machines also can be programme controlled, that is to say, it also has the device of energy sense order and the instruction that will store is transformed into the signal of telecommunication so that operate the device of above-mentioned transmission mechanism.

Only be to illustrate the present invention above, any person skilled in the art person in not breaking away from the appendix claim book under the scope of the present invention of defined, can carry out various other modification and/or conversion to the above embodiments.

Claims

1, a kind of Sewing machines comprises: one has top and lower part, thus between two parts, form one can be by will sewing up article the main body of sewing area; One contains a sewing needle and a presser feet, and by the sewing mechanism of the top of main body supporting, described presser feet is elastically biased toward downwards by spring; One is positioned at main body, is used for driving axially motion up and down of sewing needle, so that carry out the transmission mechanism of sewing operation; The table top that constitutes by the lower body part branch with one, comprise a pin hole, when driving sewing needle by presser feet and into and out of pin hole, the described article that will sew up are pressed against on the table top by presser feet, so that carry out sew application, it is characterized in that, also comprise travel mechanism, it is under the situation that does not adopt the feed dog device, carry out during the sewing operation, in order to send described article to, axially upwards transmission and presser feet remain in extreme lower position simultaneously, the also swing backward of described sewing needle that is driven by transmission mechanism at sewing needle.

2, according to the described Sewing machines of claim 1, wherein, for described article are further swung with regard to the mode that makes a round trip with every row, sewing needle is subjected to fexible bias pressure by spring and swing forward.

3, according to the described Sewing machines of claim 1, wherein, transmission mechanism comprises a member of cranking arm that is used to drive sewing needle.

4, according to the described Sewing machines of claim 3, wherein, sewing mechanism comprises that a relative sewing needle is fixed and has one is the driven member of horizontally extending passage basically, this passage engages with crank member, so that drive transmission, described passage has a blind end, and the member supporting of cranking arm comes to blind end, so that make the sewing needle swing.

5, according to the described Sewing machines of claim 1, it comprises that also one is arranged in the lower part of main body and the cover line components under the table top pin hole, is used for one of temporary transient clamping just by the coil of sewing needle band needle passing hole.

6, according to the described Sewing machines of claim 5, wherein, the cover line components is pivotally supported, so that move between the disengaged position of the clip position of the described coil of clamping and the described coil that gets loose subsequently.

7, according to the described Sewing machines of claim 6, wherein, the cover line components is elastically biased toward to clip position, and the arrangement of cover line components makes by the sewing needle that passes the table top pin hole it is moved to disengaged position from clip position.

8, according to the described Sewing machines of claim 5, wherein, the cover line components comprises a pinhock structure that is used for the described coil of clamping.

9, according to the described Sewing machines of claim 1, wherein, sewing mechanism is a kind of assembly that can dismantle from sewing machine main body.