A kind of middle presser feet drive unit of Sewing machines
Technical field
The utility model belongs to the sewing machine technique field, relates to the middle presser feet drive unit of a kind of drive unit of sewing-machine foot, particularly a kind of Sewing machines.
Background technology
Sewing machines generally comprises support, is provided with workbench at the upper surface of support, is provided with the presser feet for the compress material above workbench, and the head of band shank.Some is used for making the Sewing machines of pattern design, and presser feet is pressed in the outer rim of sewing pattern, because institute's pressure scope is bigger, when eedle was extracted from the cloth of making, the cloth with the eedle place took up easily, influences the quality of tailoring pattern.Therefore, by a middle presser feet is set at the eedle place, make in the sewing process around the eedle cloth by in presser feet push down, improve sewing quality.
When work, middle presser feet can be sheathed on outside the eedle, and is driven and can be moved up and down with eedle by axle on the head.When eedle moved downward, middle presser feet was followed eedle and is pressed down fabric; After eedle was extracted cloth, middle presser feet moved upward with eedle.
As Chinese patent notification number: CN202227085U disclose in a kind of Sewing machines foot device it comprise in presser feet and middle presser feet lifting mechanism, presser feet synchronously moves up and down with shank under the driving of machine spindle, machine spindle drives presser foot component by linkage and moves up and down, presser foot component comprises middle presser feet, the stepper motor driving shaft that middle presser feet lifting mechanism comprises stepper motor, links to each other with stepper motor, the output of stepper motor driving shaft is fixedlyed connected with swing arm after stretching out driving shaft pilot sleeve.
Foot device is when work in the above-mentioned Sewing machines, moving up and down of middle presser feet and shank is synchronously mobile along the vertical direction, sewing needle insert make thing before in presser feet drop to and press the position of making thing, sewing needle from make thing extract after presser feet leave and rise from making thing again; When sewing needle and middle presser feet quit work, when middle presser feet need lift, stepper motor started, and presser feet lifts in making.
Yet, though the lifting of presser feet during foot device can be realized in the above-mentioned Sewing machines, the number of parts of its use is more, and transmission process is loaded down with trivial details, therefore cause the complicated integral structure of device, and volume is bigger, still has more inconvenience when installation and maintenance.
Summary of the invention
The purpose of this utility model is the problems referred to above that exist at prior art, has proposed a kind of presser feet simple in structure, middle and has driven the middle presser feet drive unit of Sewing machines easily.
The purpose of this utility model can realize by following technical proposal:
A kind of middle presser feet drive unit of Sewing machines, the middle presser feet of Sewing machines is positioned at the big presser feet inside of Sewing machines, it is characterized in that, this device comprises the depression bar that is arranged in head of sewing machine and is connected with presser feet and is enclosed within power drive part on the depression bar, described power drive part can drive above-mentioned depression bar and move up and down, also be with spring on the described depression bar, the two ends of spring are inner and have the trend that moves down at the elastic force effect down-pressed pole of spring at depression bar and head respectively.
The middle presser feet drive unit of this Sewing machines is that the drive unit with big presser feet independently arranges, and particularly uses when Sewing machines carries out the style sewing to two blocks of clothes.
After the big presser feet of Sewing machines compresses piece of cloth material, driving depression bar by the power drive part overcomes the elastic force effect of spring and middle presser feet is lifted, operating personnel are placed on second block of cloth between big presser feet and the middle presser feet again, cut off the power drive part afterwards again, second block of cloth of presser feet compressed during depression bar moved down and will drive under the elastic force effect of spring, and Sewing machines carries out the style sewing to two blocks of clothes more then.
In the middle presser feet drive unit of above-mentioned Sewing machines, be fixed with tubular depression bar cover in the described head, above-mentioned depression bar is enclosed in the depression bar cover, described power drive part comprises seal and the cylinder body that is connected with depression bar, described cylinder body is enclosed within depression bar and puts, the quantity of above-mentioned seal is two, and seal is axially disposed between cylinder body and the depression bar cover along depression bar, and the cylinder body sidepiece between described two seals has the air inlet that runs through.
Utilize source of the gas to the air inlet ventilation of cylinder body, since air inlet along pressure shaft between two seals that arrange, therefore the source of the gas that feeds can promote to move on the cylinder body, and depression bar one the same the moving that be connected of drive and cylinder body, thereby makes the middle presser feet of Sewing machines upwards lift.
In the middle presser feet drive unit of above-mentioned Sewing machines, have the lead parallel with depression bar in the described head, have pilot hole and lead on the described cylinder body and be positioned at the pilot hole place.Lead can play guide effect when cylinder body moves, guarantee that cylinder body can not rotate in moving process.
In the middle presser feet drive unit of above-mentioned Sewing machines, the described depression bar cover outside has the shoulder block of protrusion, and described cylinder body inboard has the retaining edge, forms inflatable chamber between described shoulder block, retaining edge, depression bar cover and the cylinder body.
In the middle presser feet drive unit of above-mentioned Sewing machines, described cylinder body inboard has the recessed seal groove of annular, and above-mentioned seal is the O RunddichtringO and is positioned at the seal groove place.The O RunddichtringO is common seal.
In the middle presser feet drive unit of above-mentioned Sewing machines, described cylinder body inboard has the recessed seal groove of annular, and above-mentioned seal packing and packing are positioned at the seal groove place.Packing is named airtight and watertight padding again, also is a kind of common seal.
In the middle presser feet drive unit of above-mentioned Sewing machines, described air inlet place has valve.
In the middle presser feet drive unit of above-mentioned Sewing machines, be fixed with saddle on the described depression bar, have locating part in the above-mentioned head, the saddle when moving on the depression bar on it can be resisted against on the locating part.
In the middle presser feet drive unit of above-mentioned Sewing machines, described locating part comprises position-limited rack and is threaded in stop screw on the position-limited rack, stop screw and above-mentioned saddle over against and be positioned at above the saddle.
By rotation set screw, in can arranging presser feet on the Cheng Daxiao that divides a word with a hyphen at the end of a line.
Saddle moves along with depression bar one is the same and when leaning with stop screw, the amount of moving reaches maximum on the depression bar.
In the middle presser feet drive unit of above-mentioned Sewing machines, described depression bar upper end has adjusting knob, described depression bar is tubular and has guide rod on depression bar top, above-mentioned saddle is connected on the depression bar, described lower end of the guide rod is positioned at depression bar, above-mentioned spring housing acts on respectively on depression bar and the guide rod on the guide rod and the two ends of spring, has the trend that is resisted against on the adjusting knob in the elastic force effect lower guide rod upper end of spring.
Guide rod heads on adjusting knob under the elastic force effect of above-mentioned spring, adjusting knob is threaded with head, can change the pretightning force of spring, the power that presser feet descends in the control by rotating adjusting knob.
In the middle presser feet drive unit of above-mentioned Sewing machines, have recessed positioning recess on the described adjusting knob, above-mentioned guide rod upper end is positioned at the positioning recess place.
Compared with prior art, the middle presser feet drive unit of this Sewing machines has following structure:
1, during the middle presser feet drive unit utilization of this Sewing machines ventilates to control to cylinder body presser feet lift and utilize pressing down of presser feet in the spring control, not only simple in structure, and easy to operate;
2, the middle presser feet drive unit of this Sewing machines adopts lead that guide effect is played in the movement of cylinder body, guarantees that rotating can not appear in moving process in cylinder body, has improved stability;
3, the downforce size of presser feet had higher utility during the middle presser feet drive unit of this Sewing machines can arrange by adjusting knob, and applicability is wide;
4, the middle presser feet drive unit of this Sewing machines also utilizes the stroke size of presser feet in the stop screw adjustment, and is undertaken spacing by saddle and stop screw;
5, the major part of the middle presser feet drive unit of this Sewing machines all is arranged at head of sewing machine inside, has not only improved the space availability ratio at head of sewing machine place, and simultaneously owing to simple in structure, so production cost is also lower.
Description of drawings
Fig. 1 is the structural representation of the middle presser feet drive unit embodiment one of this Sewing machines.
Fig. 2 is cylinder body in the middle presser feet drive unit of this Sewing machines and the structural representation at depression bar cover place.
Fig. 3 is the structural representation of the middle presser feet drive unit embodiment two of this Sewing machines.
Among the figure, 1, middle presser feet; 2, depression bar; 3, spring; 4, depression bar cover; 5, cylinder body; 6, air inlet; 7, lead; 8, pilot hole; 9, shoulder block; 10, retaining edge; 11, seal groove; 12, O RunddichtringO; 13, valve; 14, saddle; 15, position-limited rack; 16, stop screw; 17, adjusting knob; 18, guide rod; 19, positioning recess.
The specific embodiment
Below be specific embodiment of the utility model and by reference to the accompanying drawings, the technical solution of the utility model is further described, but the utility model be not limited to these embodiment.
Embodiment one
As depicted in figs. 1 and 2, a kind of middle presser feet drive unit of Sewing machines, the tubular depression bar cover 4 that it comprises the depression bar 2 that is positioned at head of sewing machine and is connected in head, the middle presser feet 1 of depression bar 2 and Sewing machines is connected and depression bar 2 is enclosed in the depression bar cover 4.Be fixed with cylinder body 5 on the depression bar 2, cylinder body 5 is enclosed within on the depression bar cover 4.Depression bar overlaps the shoulder block 9 that 4 outsides have protrusion, and cylinder body 5 inboards have retaining along 10, and shoulder block 9, retaining form inflatable chamber along 10, between depression bar cover 4 and the cylinder body 5.
As shown in Figure 2, be provided with two O RunddichtringOs 12 between cylinder body 5 and the depression bar cover 4, O RunddichtringO 12 axially arranges along depression bar 2, and cylinder body 5 inboards have the recessed seal groove 11 of annular, and O RunddichtringO 12 is positioned at seal groove 11 places.Cylinder body 5 sidepieces between two O RunddichtringOs 12 have the air inlet 6 that runs through, and air inlet 6 places have valve 13.
As shown in Figure 1, also be with spring 3 on the depression bar 2, the two ends of spring 3 act on depression bar 2 and head inside respectively, and depression bar 2 has the trend that moves down under the elastic force effect of spring 3.Depression bar 2 upper ends stretch out head and depression bar 2 upper ends have adjusting knob 17, and the external part of depression bar 2 adjusting nut that has been threaded, adjusting nut are resisted against the head outside under the elastic force effect of spring 3.
Have the lead 7 parallel with depression bar 2 in the head, have on the cylinder body 5 and pilot hole 8, lead 7 is positioned at pilot hole 8 places.Also have position-limited rack 15 in the head and be threaded in stop screw 16 on the position-limited rack 15, also be fixed with on the lead 7 with stop screw 16 over against saddle 14, saddle 14 can be resisted against on the stop screw 16 when lead 7 moves.
Sewing machines is when work, and middle presser feet 1 is positioned at big presser feet inside.The middle presser feet drive unit of this Sewing machines is independent the setting with the drive unit of big presser feet, and when two blocks of clothes being carried out the style sewing, use, be that the drive unit of big presser feet drives big presser feet and lifts, operating personnel are placed on first block of cloth on the sewing machine table face, and big presser feet presses down first block of cloth is pressed between big presser feet and the sewing machine table face.Press down again after presser feet 1 lifted during the middle presser feet drive unit of this Sewing machines drove then again second block of cloth is pressed between big presser feet and the middle presser feet 1, and then begin sewing.
The concrete course of work of presser feet 1 was during the middle presser feet drive unit of this Sewing machines drove: valve 13 places at cylinder body 5 sidepieces ventilate by source of the gas, because the air inlet 6 of cylinder body 5 is between two O RunddichtringOs 12, gas feeds and makes air pressure increase, and owing to depression bar cover 4 is fixed in the head, therefore the gas that feeds can promote elastic force that cylinder body 5 overcomes spring 3 and uses and move, then the depression bar 2 that is connected with cylinder body 5 also along with on move, middle presser feet 1 is connected with depression bar 2, and therefore middle presser feet 1 is just along with the same moving.This moment, operating personnel just can be placed on second block of cloth between big presser feet and the middle presser feet 1.Afterwards, source of the gas is disconnected, presser feet 1 together moved down during depression bar 2 moved down and drives under the elastic force effect of spring 3, thereby second block of cloth compressed.
In the process that middle presser feet 1 lifts and presses down, because the existence of lead 7 in the head, presser feet 1 can not rotate in moving process and circumferentially rotate in can guaranteeing.The saddle that is connected 14 on the depression bar 2 then plays position-limiting action to moving on the depression bar 2, and when moving on the depression bar 2, saddle 14 leans with stop screw 16, and the amount of moving reaches maximum on the depression bar 2.In addition, by the adjusting knob 17 of depression bar 2 upper ends, the initial position of presser feet 1 during operating personnel also can arrange easily.
Certainly, seal also can adopt the mode that the seal packing is set at seal groove 11 places except the mode of O RunddichtringO 12.
Embodiment two
Present embodiment is basic identical with structure and the principle of embodiment one, and difference is: as shown in Figure 3, the depression bar 2 in the present embodiment is tubular, and has guide rod 18 on depression bar 2 tops, and saddle 14 is connected on the depression bar 2.The adjusting knob 17 that has been threaded on the head has recessed positioning recess 19 on the adjusting knob 17.Guide rod 18 lower ends are positioned at depression bar 2, and guide rod 18 upper ends are positioned at positioning recess 19 places, and spring 3 is enclosed within on the guide rod 18, and guide rod 18 has the trend that is resisted against adjusting knob 17 under the elastic force effect of spring 3.Operating personnel can change the pretightning force of spring 3 by rotating adjusting knob 17, thus the power when presser feet 1 descends in the control.
Specific embodiment described herein only is that the utility model spirit is illustrated.The utility model person of ordinary skill in the field can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present utility model or surmount the defined scope of appended claims.