CN2692179Y - Sewing mechanism of sewing machine - Google Patents

Abstract

The utility model relates to the product technical field of a sewing machine, in particular to the sewing mechanism of the sewing machine. The utility model has the technical proposal that the sewing mechanism comprises a housing, a sewing needle assembly and a presser foot assembly. The sewing needle assembly comprises a needle bar, a cross bar which is longitudinally arranged on the needle bar and firmly integrated with the needle bar and a sewing needle extending from the bottom of the needle bar. One side of the housing which is corresponding to the cross bar is provided with a baffle plate, and the baffle plate is arranged on a horizontal plane when the cross bar slides to the lowest position. By adopting the structure, the baffle plate of the utility model can keep the sewing needle assembly doing vertical up-and-down movement before the sewing needle assembly reaches the lateral misalignment. So the generation of the intense abrasion between the sewing needle and the second bevel of a sleeve wire machine can be avoided. The operation of the sewing mechanism is more stable and accurate.

Description

A kind of sewing mechanism of Sewing machines

Technical field:

The utility model relates to the Sewing machines product technical field, particularly relates to a kind of sewing mechanism of Sewing machines.

Background technology:

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.Wherein top comprises 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.Its lower body part branch is made of a table top, and is provided with pin hole on table top, and the article that sew up are pressed on this table top by presser feet, is located at the table top below and also has people's feed dog device, and 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 characteristics such as complex structure.At this shortcoming, the inventor once proposed a kind of Sewing machines that structure is simplified greatly, saw the patent No. for details and was: 93107420.7 patent of invention.This product is not provided with the feed dog device that advances fabric, the Sewing needles swing is reached send the effect that will sew up article synchronously to, simplified the general structure of Sewing machines greatly, reach simple in structure and adopt, and is easily manufactured, operates terse effect.The swing of sewing needle is that the cross bar that the pin of cranking arm by transmission mechanism drives sewing mechanism is realized in this patent of invention.The rotation that will constantly go round and begin again during the pin of promptly cranking arm work, in each cycle of rotation, the pin of cranking arm will collide the blind end of a horizontal pole gain in the sewing mechanism, make the instantaneous swing of whole sewing needle assembly, and sewing mechanism relies on the effect of spring to reset smoothly more simultaneously.So pin leaves the blind end of groove in case crank arm, back-moving spring just makes suture needle get back to the upright position.But when real work, when cranking arm pin when minimum position moves up, be the Sewing machines assembly begin to move up until the pin of cranking arm strike the cross bar groove blind end during this period of time in, the sewing needle assembly should only be done vertical motion up and down, but crank arm pin in rotating process, it will produce a frictional force of pointing to blind end to groove, will be at this frictional force effect sheer pole to its blind end motion, and the needle point of sewing needle has arrived on the cover line device that is positioned at the sewing mechanism below at this moment, and act on second inclined-plane that overlaps the line device, so that cover line device is counterclockwise to turn to the extreme lower position that arrives it.So just caused sewing needle the time to lower compression cover line device, it will produce transverse movement simultaneously, cause the needle point of sewing needle and overlap friction aggravation between line device second inclined-plane, not only easily cause the wearing and tearing on second inclined-plane, the easier distortion that causes sewing needle, What is more causes fractureing of sewing needle.

Summary of the invention:

The purpose of this utility model is intended to overcome the existing deficiency of sewing mechanism in the related Sewing machines of foregoing invention patent, proposes a kind of stable, sewing mechanism of Sewing machines accurately of guaranteeing.

For achieving the above object, the technical scheme that the utility model adopted is: this sewing mechanism comprises an outer cover, a sewing needle assembly and a presser foot component, the sewing needle assembly by shank, cross at shank and the cross bar that is solidified as a whole with it and a sewing needle of stretching from the shank bottom and constitute, side in the relative cross bar of outer cover is provided with a baffle plate, and this baffle plate is positioned on the horizontal plane that slides into extreme lower position under the cross bar.

After the utility model adopts this structure, in the process of its work, baffle plate will stop that the sewing needle assembly kept vertical moving up and down before no show lateral shift state, with guarantee sewing needle not can with the second inclined-plane generation sharp wear of cover line device, make the operation of sewing mechanism stable more, accurately.

Description of drawings:

Fig. 1 is the structural representation of the related Sewing machines of the utility model;

Fig. 2 is the structural representation of the related drive gear of sewing machine of the utility model;

Fig. 3 is a structural representation of the present utility model;

Fig. 4 A and 4B are that the utility model presser feet is in when reducing and the side view of the relative position when raising;

Fig. 5 A and 5B are the utility model and the work schematic diagram of transmission mechanism under two kinds of different conditions;

Fig. 6 A～6F is the side view of the utility model order of different conditions under transmission mechanism drives;

Fig. 7 is the needle tracking schematic diagram that the utility model forms on workpiece under the gearing of transmission mechanism;

Fig. 8 is the structural representation of the cover line mechanism of the related Sewing machines of the utility model;

The side view of the order of duty when Fig. 9 A～9F is the utility model and the associated working of cover line mechanism;

The sequential schematic of duty when Figure 10 A～10K sewing needle of the present utility model and the associated working of cover line mechanism.

The specific embodiment:

For the utility model being made more detailed description, will do detailed description to the related Sewing machines of the utility model here.

At first with reference to figure 1～3, shown in the figure related Sewing machines 10 of the utility model and the utility model and transmission mechanism 15 below.Wherein Sewing machines 10 comprises 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 pin hole 43 (see figure 4)s are arranged in the table top 14.Head 13 falls L shaped, it extend upward from pedestal 12 1 ends 131 and then lateral extensometer to the relative other end of pedestal 12, and end at the free end 132 that is positioned at pedestal 12 tops, thereby between them, formed a sewing area.

The utility model (being sewing mechanism 16) and transmission mechanism 15 lay respectively at the relative two ends 132 and 131 of head 13.

See Fig. 2, transmission mechanism 15 drives the motor 18 of power transmission shafts 17, a deceleration duplicate gear 20 and a crown wheel 21 that is fixedly mounted on power transmission shaft 17 1 axle heads 171 by a power transmission shaft 17, one by transmission output pinion 19 and forms.Be provided with a handwheel 53 in the end of axle head 171, it is exposed at the outside of head 13, can be used for by hand rotating drive shaft 17.Another axle head 172 of power transmission shaft 17 extend into sewing mechanism 16, and has radially cranking arm of the pin 23 of axially cranking arm by one and 22 engage with it.

See Fig. 3, sewing mechanism 16 (the utility model) has the outer cover 24 of a vertical cuboid, a sewing needle assembly 25 and a presser foot component 26.Sewing needle assembly 25 by shank 27, cross at shank 27 and cross bar 28 and a sewing needle 29 of stretching from shank 27 bottoms of being solidified as a whole out with it are formed.Shank 27 usefulness axle journals supportings also can be passed the through hole that outer cover 24 offered and vertically slide, and cross bar 28 then passes the square aperture 30 on 15 the side 240 from outer cover 24 towards transmission mechanism and is exposed at the outside of outer cover 24.Cross bar 28 is provided with the groove 31 that extends along its body, and groove 31 is also towards driving face structure 15, and it has a blind end 32 and an openend 33, and openend 33 does not arrive cross bar 28 respective end portions, and cross bar 28 stretches out forward from its openend 33, forms a thread take-up tension lever 34.As shown in the figure, the width of the general outer cover 24 with a side 240 of being with opening 30 of the length of groove 31 equates.In addition a side of groove 31 blind ends 32 is provided with a baffle plate 241 on outer cover 24 relative cross bars 28, and this baffle plate 241 is positioned on the horizontal plane that cross bar slides into extreme lower position for 28 times.

See shown in Fig. 4 A and the 4B that 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.Presser bar 35 and integral stem 36 are by the axle journal supporting and can pass outer cover 24 vertical slip, and they are by the spring 38 that is arranged on the interior integral stem 36 of outer cover 24 and applies power of enforcement between presser bar 35 and outer cover 24 roofs fexible bias pressure in addition downwards.Presser foot component 26 also has a normally L shaped presser feet handle 39, to be used for the presser feet 37 that raises.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 13 free ends 132 (see figure 1)s, rotates 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 (seeing Fig. 4 A), and when it is in when upper, presser feet 37 is from table top 14 raise (seeing Fig. 4 B).

See Fig. 5 A and 5B, it is the connected structure between transmission mechanism 15 and the sewing mechanism 16.Wherein, the pin 23 of cranking arm of transmission mechanism 15 is slidably engaged within the groove 31 in sewing mechanism 16 cross bars 28.When power transmission shaft 17 rotates, crank arm 22 and the pin 23 of cranking arm just rotates, thereby make sewing needle assembly 25 enter reciprocating motion, generally be the reciprocating motion of do 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 simultaneously, and promptly spring 42 can reset sewing needle assembly 25 smoothly.So pin 23 leaves the blind end 32 of groove 31 in case crank arm, 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 duty and the relative position thereof of the pin 23 of cranking arm with the transmission that rotates counterclockwise.In Fig. 6 A, the pin 23 of cranking arm is in the extreme higher position, also is that Sewing machines assembly 25 is positioned the highest position.When the pin 23 of cranking arm rotated, sewing needle was formed 25 and is moved down (shown in Fig. 6 B) immediately, and at this moment, the pin 23 of cranking arm is mobile freely along the openend 33 of the groove 31 of cross bar 28.Fig. 6 C represents that sewing needle assembly 25 23 takes minimum position to by cranking arm.When cranking arm pin 23 when minimum position moves up, Sewing machines assembly 25 begins to move up, and strikes the blind end 32 of cross bar groove 31 until the pin 23 of cranking arm.In background technology, illustrated, during this period of time, sewing needle assembly 25 should only be done vertical motion up and down, but crank arm pin 23 in rotating process, it will produce a frictional force of pointing to blind end 32 to groove 31, will be at this frictional force effect sheer pole 31 to its blind end 32 motions, but the needle point of sewing needle 29 is to being positioned on the cover line device 46 that reaches sewing mechanism 16 belows (seeing below described) at this moment, and act on second inclined-plane 502 that overlaps line device 46, so that cover line device 46 is counterclockwise to turn to the extreme lower position that arrives it.So just make sewing needle 29 the time to lower compression cover line device 46, it will produce transverse movement simultaneously, thereby cause the needle point of sewing needle 29 and overlap friction aggravation between line device 46 second inclined-planes 502, not only easily cause the wearing and tearing of the second inclined-plane 50B, the easier distortion that causes sewing needle 29, What is more causes fractureing of sewing needle 29.The utility model is for addressing this problem, and its side at outer cover 24 opposed slots 31 blind ends 32 is provided with a baffle plate 241, and this baffle plate 241 is positioned on the horizontal plane that cross bar slides into extreme lower position for 28 times.Baffle plate 241 will stop that sewing needle assembly 25 kept vertical moving up and down before no show lateral shift state like this, with guarantee sewing needle 29 not can with the second inclined-plane generation sharp wear of cover line device 46, make the operation of sewing mechanism stable more, accurately.When the blind end 32 of the pin 23 bump cross bar grooves 31 of cranking arm, sewing needle assembly 25 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 turns right (shown in Fig. 6 D).Fig. 6 E pin 23 of representing to crank arm is in the rightest position, also is the position that sewing needle assembly 25 is in the right side.When the pin 23 of cranking arm further upwards rotated by this least significant, 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 the 6A.

See Fig. 7, it is illustrated in the track of sewing needle 29 in each circulation of sewing process.Along with the periodic duty of sewing assembly 25, just finish sewing/stitching work continuously.During use, presser feet 37 is dropped on the workpiece 44 (article that will make), it is pressed on the table top 14 so that carry out sewing operation, shown in Fig. 6 A～6F, cranking arm 22 and the pin 23 of cranking arm in the complete cycle of rotating, 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, it is instantaneous ground swing (Fig. 6 D and 6E) to the right under the pin 23 of cranking arm drives just, thus keep with situation that workpiece 44 engages under make workpiece 44 take a step forward (needle gage) to the right.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 44 like this.

Certainly, in other embodiments, can needle gage can be adjusted 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 by the user.

When related Sewing machines 10 designs of the utility model 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 among the figure by the helical spring 49 on axle 47 1 ends.Cover line device 46 is provided with first inclined-plane 501, second inclined-plane 502 and a whole pinhock 52.

Below with reference to Fig. 9 A～9F, there is shown sewing needle assembly 25, crank arm 22, crank arm 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, lean against on first inclined-plane 501 of cover line device with a low-angle earlier, and towards second inclined-plane 502 (Fig. 9 A and 9B) that overlaps line device 46, then by first inclined-plane 501 of cover line device, second inclined-plane 502 of bump cover line device more subsequently, thereby make cover line device turn to the extreme lower position that arrives it by the counter clockwise direction shown in 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 46 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 the pin 23 of cranking arm under, to swing to the right 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 511 (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 511 of clamping with next section of line 51, meanwhile with a low-angle lean against, and first inclined-plane 501 by cover line device.Sewing needle 29 leans against and has guaranteed on the first inclined-plane 50A of cover line device 46 that it can not miss the sub-51A of coil, because inclined-plane 50A is one with the pinhock 52 that cover line device 46 passes the coil 511 of clamping.When sewing needle 29 1 its extreme lower positions of arrival, the coil 511 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 512 (shown in Figure 10 G and 10H) of line 51 again, and is last, pins first coil 511 by above-mentioned second coil 512.After sewing needle 29 passes second coil 512, move downward in an identical manner again and form the 3rd coil 513 (Figure 10 I) of line 51, and in next one circulation, pass the 3rd coil 513 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.

In sum, workpiece 44 sewed up and progressively advances/give by the Sewing machines 10 that the utility model is related, its sewing needle 29 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 the utility model is by being provided with baffle plate 241 on outer cover 24, to guarantee that sewing needle 29 is being in when overlapping line device 46 and contact (when sewing needle 29 is positioned at lowest positions), lateral deflection can not take place in it, remain under the vertical state that moves, when the cross bar 28 in sewing mechanism 16 rises to the position that is higher than baffle plate 241, it just can deflection to the right under the pin 23 of cranking arm drives, and finishes the action of work feed.

The above only is the utility model one embodiment, does not therefore limit the protection domain of utility model.

Claims (2)

1, a kind of sewing mechanism of Sewing machines, comprise: an outer cover (24), a sewing needle assembly (25) and a presser foot component (26), sewing needle assembly (25) by shank (27), cross at shank (27) and the cross bar (28) that is solidified as a whole out with it and a sewing needle (29) of stretching from shank (27) bottom constitute, it is characterized in that: in outer cover (24) relatively a side of cross bar (28) be provided with a baffle plate (241), and this baffle plate (241) is positioned under the cross bar (28) and slides on the horizontal plane of extreme lower position.

2, the sewing mechanism of a kind of Sewing machines according to claim 1 is characterized in that: cross bar (28) is exposed at the outside of outer cover (24) by passing in the opening (30) on outer cover (24) one sides (240); Cross bar (28) is provided with the groove (31) that extends along its body, and groove (31) has a blind end (32) and an openend (33), and baffle plate (241) is positioned at the side that cross bar (28) is gone up groove (31) blind end (32).

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