CN2709475Y - Sewing machine of sewing machine - Google Patents

Abstract

The utility model relates to the technical field of a sewing machine, in particular to the sewing mechanism of the sewing machine. The sewing mechanism comprises a housing, a sewing needle assembly and a presser foot assembly. The sewing needle assembly is composed of a needle bar, a cross bar which is arranged on the needle bar and integrated with the needle bar and a sewing needle extending from the bottom of the needle bar. One end of the cross bar is provided with an extending panel which is vertically fixed with the cross bar and integrated with the cross bar. The side of the cross bar which is contiguous with an outer housing is provided with a positioning board, and an elastic gasket is provided above the positioning board. By adopting the structure, the positioning board of the utility model can block the displacement of the cross bar on the horizontal direction. So the movement of the sewing needle assembly on the vertical direction without errors caused by other factors can be ensured. When the extending board moves to the position of the elastic gasket along the vertical direction, the sewing needle assembly moves horizontally through the function of the elastic gasket.

Description

The sewing mechanism of Sewing machines

Technical field:

The utility model relates to the sewing machine technical field, refers in particular to a kind of sewing mechanism of Sewing machines.

Background technology:

The existing sewing machine tool is made up of a main body usually, 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 spring applies bias voltage to presser feet.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 machine 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 needle 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.Simultaneously, because the vertical motion of cross bar and horizontal deflection all drive by the pin of cranking arm and realize in this sewing needle assembly, be prone to the situation of mechanism's fluctuation of service.

Summary of the invention:

The purpose of this utility model is intended to overcome the existing deficiency of sewing mechanism in the above-mentioned Sewing machines, proposes a kind of improvement of the sewing mechanism to Sewing machines, makes it to guarantee stable in the course of the work, accurate.

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 on the shank and cross bar and a sewing needle that is stretched out by the shank bottom of being solidified as a whole with it constitute, one end of cross bar is provided with and the extension board that be solidified as a whole vertical with cross bar, side in the outer cover adjacent crossbars is provided with a limiting plate, and the limiting plate top is provided with an elastomeric pad.

Above-mentioned cross bar is exposed at the outside of outer cover by passing in the opening on outer cover one side, and which is provided with the groove that extends along its body.

Described limiting plate is positioned on the horizontal plane that slides into extreme lower position under the cross bar, and form between limiting plate and the outer cover side one can ccontaining cross bar on the groove of extension board.

One end of described elastomeric pad is fixed on the outer cover, and the other end that is positioned at directly over the limiting plate is formed with a lug boss.

Form an angle between described extension board upper side edge and the outer cover side, its lower side is affixed on the side of outer cover; Form an angle on the elastomeric pad between the upper side edge of lug boss and the outer cover side, its lower side is affixed on the side of outer cover.

After the utility model adopted this structure, the vertical motion of cross bar and level are moving to realize that by two different modes wherein vertical motion is still by the pin mobile realization in the transverse groove on cross bar of cranking arm; And horizontal hunting is to realize by the pad that the extension board of cross bar one end is crossed on the outer cover.Limiting plate can stop cross bar displacement in the horizontal direction in the process of its work, guarantee that the motion on the whole sewing needle assembly vertical direction can error not occur because of its factor, when extension board vertically moves to pads placement, to at first cross pad by its outer surface, again by the interior gap of passing between pad and the outer cover side, by the effect of pad, the sewing needle assembly is laterally moved.More than device has been guaranteed the sewing needle assembly in running, and error reduces, more stable work, accurate.

Description of drawings:

Fig. 1 is the structural representation of the related sewing machine of the utility model;

Fig. 2 is the structural representation of the transmission mechanism of the related 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 schematic diagram of the utility model order of different conditions under transmission mechanism drives;

Fig. 7 A～7F is the schematic perspective view of the utility model order of motion process under transmission mechanism drives;

Fig. 8 is the schematic diagram of the utility model sewing needle running orbit;

Fig. 9 is the structural representation of the cover line mechanism of the related Sewing machines of the utility model;

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 machine of the utility model here.

At first with reference to figure 1～3, shown in the figure related sewing mechanism 10 of the utility model and the utility model and transmission mechanism 15 below.Wherein sewing machine 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 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 transmission mechanism 15.One end of cross bar 28 is provided with and the extension board 281 that be solidified as a whole vertical with cross bar 28, and its other end 33 stretches out forward and 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 thread take-up tension lever 30 of the length of groove 31 equates.In conjunction with Fig. 7 A～7F, be provided with a limiting plate 241 in a side 242 of outer cover 24 adjacent crossbars 28, and limiting plate 241 tops there is an elastomeric pad 244.This limiting plate 241 is positioned on the horizontal plane that cross bar slides into extreme lower position for 28 times, and form between limiting plate 241 and outer cover 24 sides 242 one can ccontaining cross bar 28 on the groove 243 of extension board 281.And an end of elastomeric pad 244 is fixed on the outer cover 24, and the other end that is positioned at directly over the limiting plate 241 is formed with a lug boss 245.Form an angle 282 between extension board 281 upper side edges on the cross bar 28 and outer cover 24 sides 242, its lower side is affixed on the side 242 of outer cover 24; Form an angle 246 on the elastomeric pad 244 between the upper side edge of lug boss 245 and outer cover 24 sides 242, its lower side is affixed on the side 242 of outer cover 24.

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 conjunction with Fig. 7 A～7F in each cycle of rotation, cross bar 28 is in the process of motion from bottom to top, its terminal extension board 281 will be crossed this elastomeric pad 244 by the outer surface of lug boss 245, thereby realize that cross bar 281 drives whole sewing needle assembly 25 and swings backward, because extension board 281 top edges are formed with an angle 282, so extension board 281 can be crossed lug boss 245 smoothly.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.In case so extension board 281 is crossed on the elastomeric pad 244 behind the lug boss 245, spring 42 just plays the effect that makes sewing needle 29 get back to the upright position.After extension board 281 is crossed lug boss 245, it will do motion from top to bottom, because elastomeric pad 244 has certain elasticity, so extension board 281 will be easy to elastomeric pad 244 is formed with an end of lug boss 245 and prop up, and enter gap between lug boss 245 and the side 242 by the angle 246 that lug boss 245 upper side edges form, slippage straight down so just guarantees that cross bar 28 lateral displacement can not occur.In addition, 241 of limiting plates are to be used to limit cross bar 28 to occur lateral displacement during to its lowest position in slippage, the i.e. motive force that stops the 23 pairs of cross bars of pin 28 of cranking arm to produce by limiting plate 241, the motion to guarantee that 25 this moments of whole sewing needle assembly can be in vertical direction reduces error.

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 rotates, sewing needle assembly 25 moves down (shown in Fig. 6 B) immediately, at this moment, the pin 23 of cranking arm is mobile freely along an end 33 of the groove 31 of cross bar 28, and the extension board 281 on the cross bar 28 will be by the downward slippage in gap between lug boss 245 on the elastomeric pad 244 and outer cover 24 1 sides 242.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.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 extension board 241 1 ends 32 to groove 31, will be at this frictional force effect sheer pole 31 to an end 32 motions of extension board 241, 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 on second inclined-plane 502, the easier distortion that causes sewing needle 29, What is more causes fractureing of sewing needle 29.The utility model is provided with limiting plate 241 for addressing this problem on the side 242 of this outer cover 24, and limiting plate 241 is positioned on the horizontal plane that cross bar slides into extreme lower position for 28 times.Limiting 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, after the extension board 281 of cross bar 28 touches lug boss on the pad 244, 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 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.After extension board 281 passed through elastomeric pad 244, when further upwards rotating, 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.

Seeing Fig. 7 A～7F, is the schematic perspective view of the order of the utility model motion process, schemes the extension board 281 that we can clearly see clearly on the cross bar 28 thus and how to move.Cross bar 28 moves at first from top to bottom, extension board 281 also will move from top to bottom along the side 242 of outer cover 24 (seeing Fig. 7 A).Because elastomeric pad 244 has certain elasticity, and be formed with an angle 246 between elastomeric pad 244 lug bosses, 245 upper side edges and outer cover 24 sides 242, so the bottom of extension board 281 will be easy to strut lug boss 245, enter between lug boss 245 and the side 242 by angle 246, and slippage straight down (seeing Fig. 7 B), so just guarantee that cross bar 28 lateral displacement can not occur, until passing lug boss 245 (seeing Fig. 7 C).After treating that extension board 281 enters in the limiting plate 241 formed grooves 243, this moment, cross bar 28 also slided to extreme lower position just down, extension board 281 is arranged in groove 243 can guarantee that cross bar 28 lateral displacement can not occur, with the motion that guarantees that whole sewing needle assembly 25 can be in vertical direction, reduce error (as seeing Fig. 7 D).When cross bar 28 is mobile from bottom to top, its terminal extension board 281 will be crossed lug boss 245 on this elastomeric pad 244 by the outer surface of lug boss 245, thereby realize that cross bar 281 drives whole sewing needle assembly 25 and swings backward, because extension board 281 top edges are formed with an angle 282, so extension board 281 can be crossed lug boss 245 (as seeing Fig. 7 E) smoothly.In case and extension board 281 is crossed on the elastomeric pad 244 behind the lug boss 245, spring 42 just plays the effect that makes shank 27 get back to the upright position, and does motion vertical motion from top to bottom once more, and promptly whole sewing mechanism is got back to original position.

Fig. 8 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, is 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 swing (Fig. 6 D and 6E) to the right under extension board 281 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 that is used to control elastomeric pad 244 lug bosses 245 thickness is set by the user.

See Fig. 9, this be the utility model related cover line mechanism 45, it is positioned under the table top 14.This 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 Figure 10 A～10F, 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 position motionless from Fig. 9 D, and sewing needle assembly 25 is realized the lateral displacement of cross bar 28 under the effect of crank arm pin 23 and extension board 281.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 first inclined-plane 501 of cover line device 46 that it can not miss coil 511, because inclined-plane 501 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 514 (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 limiting 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 of pad 244, it just can deflection to the right under the effect of pad 244, 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 (5)

1, the 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) is by shank (27), cross at cross bar (28) and sewing needle (a 29) formation of stretching out that shank (27) is gone up and is solidified as a whole with it by shank (27) bottom, it is characterized in that: an end of cross bar (28) is provided with and the extension board (281) that be solidified as a whole vertical with cross bar (28), side (242) in outer cover (24) adjacent crossbars (28) is provided with a limiting plate (241), and limiting plate (241) top is provided with an elastomeric pad (244).

2, the sewing mechanism 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, and which is provided with the groove (31) that extends along its body.

3, the sewing mechanism of Sewing machines according to claim 1, it is characterized in that: described limiting plate (241) is positioned under the cross bar (28) and slides on the horizontal plane of extreme lower position, and forms a groove (243) of can ccontaining cross bar (28) going up extension board (281) between limiting plate (241) and outer cover (24) side (242).

4, the sewing mechanism of Sewing machines according to claim 3 is characterized in that: an end of described elastomeric pad (244) is fixed on the outer cover (24), and the other end that is positioned at directly over the limiting plate (241) is formed with a lug boss (245).

5, the sewing mechanism of Sewing machines according to claim 4 is characterized in that: form an angle (282) between extension board (281) upper side edge and outer cover (24) side (242), its lower side is affixed on the side (242) of outer cover (24); Form an angle (246) between the upper side edge of the last lug boss (245) of elastomeric pad (244) and outer cover (24) side (242), its lower side is affixed on the side (242) of outer cover (24).

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