CN108118454B

CN108118454B - But fast separation and reunion's adjust knob lifts presser foot altitude mixture control mechanism

Info

Publication number: CN108118454B
Application number: CN201611075333.6A
Authority: CN
Inventors: 严文进; 谭炜军
Original assignee: Bullmer Electromechanical Technology Co Ltd
Current assignee: Bullmer Electromechanical Technology Co Ltd
Priority date: 2016-11-29
Filing date: 2016-11-29
Publication date: 2023-07-07
Anticipated expiration: 2036-11-29
Also published as: CN108118454A

Abstract

The invention provides an adjusting knob capable of being quickly engaged and disengaged, which comprises an adjusting limiting plate with a fixed position, a rotating shaft rotatably penetrating through the adjusting limiting plate, a knob fixed at one end of the rotating shaft, an adjusting wheel fixed at the other end of the rotating shaft, and a spring positioned between the knob and the adjusting limiting plate, wherein the spring is in a compressed state, a limiting protruding part is arranged on one end face of the adjusting wheel, facing the adjusting limiting plate, of the adjusting wheel, an eccentric shaft part eccentrically arranged with the rotating shaft is arranged on the other end face of the adjusting wheel, facing away from the adjusting limiting plate, of the adjusting wheel, and a limiting concave part facing the adjusting wheel and matched with the limiting protruding part is arranged on the adjusting limiting plate. According to the adjusting knob, the clutch between the adjusting wheel and the adjusting limiting plate can be realized by pressing or loosening the knob, and then when the knob is loosened, the adjusting knob is wholly in a self-locking state by matching the limiting protruding part on the adjusting wheel with the limiting concave part on the adjusting limiting plate, so that the self-locking is reliable and stable, and the presser foot lifting height adjusting mechanism is guaranteed to reliably operate after the presser foot height adjusting is finished.

Description

But fast separation and reunion's adjust knob lifts presser foot altitude mixture control mechanism

Technical Field

The invention relates to an adjusting piece, in particular to a quick-clutch adjusting knob suitable for a presser foot lifting height adjusting mechanism in a buttonholing machine and the presser foot lifting height adjusting mechanism with the quick-clutch adjusting knob.

Background

Buttonholing machine is one type of industrial sewing machine, belongs to special machine, and is mainly used for processing buttonholes in various clothes. Along with the continuous development of technology, the buttonholing machine also develops towards the direction of semi-automation and full automation, so that the functions of the buttonholing machine are more and more perfect, for example, a presser foot lifting height adjusting mechanism is arranged in the buttonholing machine and is used for adjusting the upward or downward moving stroke of the presser foot, so that the presser foot mechanism in the buttonholing machine can be suitable for cloth with different thicknesses, and further the normal work of the buttonholing machine is ensured, and the buttonholing machine has higher work efficiency. Generally, in buttonholing machines with presser foot lifting height adjusting mechanisms, operation members are configured, and the operation members may be a knob adjusting type structure, a thread adjusting type structure, a spanner adjusting type structure, etc., but most of the operation members currently cannot realize fast clutch well, so the reliability of self-locking is poor, and thus the reliable operation of the presser foot lifting height adjusting mechanism cannot be ensured.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide a quick-clutch adjusting knob, which is reliable and stable in self-locking and simple and quick in operation.

In order to achieve the above purpose, the invention provides an adjusting knob capable of being quickly engaged and disengaged, which comprises an adjusting limiting plate with fixed positions, a rotating shaft rotatably penetrating through the adjusting limiting plate, a knob fixed at one end of the rotating shaft, an adjusting wheel fixed at the other end of the rotating shaft, and a spring positioned between the knob and the adjusting limiting plate, wherein the spring is in a compressed state, a limiting protruding part is arranged on one end surface of the adjusting wheel facing the adjusting limiting plate, an eccentric shaft part eccentrically arranged with the rotating shaft is arranged on the other end surface of the adjusting wheel facing away from the adjusting limiting plate, and a limiting concave part facing the adjusting wheel and matched with the limiting protruding part is arranged on the adjusting limiting plate; when the knob is pressed, the limit protruding part on the adjusting wheel is separated from the limit concave part on the adjusting limit plate, and the knob drives the adjusting wheel to rotate through the rotating shaft; when the knob is loosened, the limit protruding part on the adjusting wheel is matched with the limit concave part on the adjusting limit plate, and the adjusting knob is self-locking.

Further, the rotary knob adjusting device also comprises a scale disc which is fixed in position and provided with scales, the scale disc is positioned between the rotary knob and the adjusting limiting plate, and a through hole for allowing the spring and the rotating shaft to pass through is formed in the scale disc.

Preferably, a guiding shaft part is arranged on one end face of the knob, facing the adjusting limiting plate, of the rotary shaft, the spring is sleeved on the rotary shaft, and one end of the spring is sleeved on the guiding shaft part of the knob.

Further, the limiting protruding part on the adjusting wheel is a limiting bolt, and the limiting concave part on the adjusting limiting plate is a plurality of limiting holes; when the knob is loosened, the end part of the limiting bolt is inserted into one limiting hole of the limiting holes.

Preferably, two blocking pins are arranged on one end face, facing the adjusting wheel, of the adjusting limiting plate, and the two blocking pins are respectively located at two ends of the limiting concave part and used for limiting rotation of the limiting plug pin.

Further, the limiting protruding part on the adjusting wheel is a gear part, and the limiting concave part on the adjusting limiting plate is a gear groove matched with the gear part; when the knob is released, the gear is positioned in the gear groove.

Further, the limit protruding part on the adjusting wheel is a polygonal part, and the limit concave part on the adjusting limit plate is a polygonal groove matched with the polygonal part; when the knob is released, the polygonal portion is positioned in the polygonal groove.

The application also provides a presser foot lifting height adjusting mechanism which is arranged in a machine shell, wherein the presser foot lifting height adjusting mechanism comprises a presser foot lifting driving assembly arranged in the machine shell, a swinging rod which is arranged in the machine shell and provided with a first fixed swinging fulcrum, a transmission part which extends along the length direction of the machine shell, and a presser foot lifting executing assembly arranged in the machine shell, a presser foot rod is arranged in the presser foot lifting executing assembly, the presser foot lifting driving assembly is connected with one end of the swinging rod and drives one end of the swinging rod to swing, the other end of the swinging rod is hinged with one end of the transmission part, the other end of the transmission part is connected with the presser foot lifting executing assembly and drives the presser foot rod to move upwards or downwards, the presser foot lifting height adjusting assembly comprises an adjusting knob which can be quickly separated and combined, and the adjusting limiting plate is fixed on the inner wall of the machine shell and is positioned outside the machine shell; when the knob is pressed and the adjusting wheel is driven to rotate through the rotating shaft, the eccentric shaft part enables the hinging point of the swing rod and the transmission part to move upwards or downwards.

Further, the presser foot lifting height adjusting assembly further comprises a guide rail plate capable of moving up and down and a connecting pin, the guide rail plate is provided with a first guide rail plate arm part and a second guide rail plate arm part which are arranged in parallel, one end of the second guide rail plate arm part, one end of a transmission part and the other end of a swinging rod are hinged through the connecting pin, a first sliding groove extending along the length direction of the swinging rod is formed in the swinging rod, a second sliding groove extending along the length direction of the second guide rail plate arm part is formed in the second guide rail plate arm part, and the connecting pin is arranged in the first sliding groove and the second sliding groove in a penetrating mode; the first guide rail plate arm is provided with a third sliding groove extending along the length direction of the first guide rail plate arm, and the eccentric shaft part is arranged in the third sliding groove in a penetrating mode.

Preferably, the presser foot lifting height adjusting assembly further comprises a mounting frame, the mounting frame comprises a mounting frame fixing portion fixed with the machine shell and a mounting frame guiding portion provided with a first guiding groove extending up and down, the guide rail plate further comprises a guide rail plate body portion located between the first guide rail plate arm portion and the second guide rail plate arm portion, a guide bolt is fixed on the guide rail plate body portion, and the guide bolt is arranged in the first guiding groove of the mounting frame guiding portion in a penetrating mode.

As described above, the invention relates to a quick clutch adjusting knob and a presser foot lifting height adjusting mechanism, has the following beneficial effects:

the adjusting knob can realize the separation and reunion between the adjusting wheel and the adjusting limiting plate by pressing or loosening the knob, so that when the knob is loosened, the whole adjusting knob is in a self-locking state by matching the limiting protruding part on the adjusting wheel with the limiting concave part on the adjusting limiting plate, and the self-locking is reliable and stable, thereby ensuring that the presser foot lifting height adjusting mechanism can reliably operate after the presser foot height adjustment is finished; in addition, the adjusting knob only needs to be pressed and rotated during adjustment, and the operation is simple and quick.

Drawings

Fig. 1 is a schematic structural view of an adjusting knob capable of being quickly engaged and disengaged in the present application.

Fig. 2 and 3 are exploded views of fig. 1.

Fig. 4-6 illustrate various embodiments of the retention tab of fig. 1.

Fig. 7 is a schematic structural view of the buttonholing machine in the present application.

Fig. 8 and 9 are schematic structural views of the presser foot lifting height adjusting mechanism in the present application under different viewing angles.

Fig. 10 is an exploded view of fig. 9.

Fig. 11 is a schematic structural view of the presser foot lifting driving assembly in fig. 9.

Fig. 12 is a schematic view of the presser foot lifting actuator assembly of fig. 9.

Fig. 13 is a schematic diagram of a presser foot height adjustment mechanism in the present application.

Figures 14 and 15 illustrate different embodiments of the lift foot height adjustment assembly of figure 13.

Fig. 16 is a side view of fig. 15.

Fig. 17 and 18 show different embodiments of the rotor of fig. 9.

Description of element reference numerals

10. Guide plate of casing 64

101. Second guide groove of tail 641

102. Nose 65 support

20. Slide block of driving motor 651

30. Presser foot lifting driving assembly 66 axial screw

31. Rotating member 70 lifts presser foot height adjustment assembly

311. Cam peripheral surface 71 guide rail plate

312. Cam groove 711 first rail plate arm

313. First arc segment 712 second rail plate arm

314. Second arc section 713 rail plate body portion

315. Third arc segment 714 second chute

32. Third slide way of driving crank 715

321. Connecting pin for crank body 72

322. First crank arm 73 mounting bracket

323. Second crank arm 731 mounting bracket fixing portion

33. Roller 732 mounting frame guide

34. First guide groove of adapter 733

341. Guide bolt for adapter body part 74

342. Adapter shaft 80 adjustment knob

35. Fixed pin 81 adjusting limiting plate

36. Motor mounting plate 811 limit hole

37. Balance bar pin 812 stop pin

38. Torsion spring 82 rotation shaft

39. Screw 83 knob

40. Swing link 831 guide shaft part

41. First chute 84 adjusting wheel

42. Eccentric shaft portion of retainer 841

50. Driving part 842 limit bolt

60. Gear part of presser foot lifting execution assembly 843

61. Polygonal portion of presser foot bar 844

62. Spring of presser foot lifting swinging rod 85

63. Presser foot lifting connecting rod 86 scale plate

631. Through hole of adjusting groove 861

Detailed Description

Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.

It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the invention, are not intended to be critical to the essential characteristics of the invention, but are intended to fall within the spirit and scope of the invention. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the invention, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the invention may be practiced.

In the following examples, the directions are defined as follows: the longitudinal direction of the buttonholing machine is defined as the left-right direction, the width direction of the buttonholing machine is defined as the front-rear direction, and the height direction of the buttonholing machine is defined as the up-down direction.

The present application provides a quick-clutch adjusting knob 80, as shown in fig. 1 to 3, the quick-clutch adjusting knob 80 includes a fixed adjusting limiting plate 81, a rotating shaft 82 extending back and forth along the width direction of the casing 10, a knob 83 fixed at the front end of the rotating shaft 82, an adjusting wheel 84 fixed at the rear end of the rotating shaft 82, and a spring 85 located between the knob 83 and the adjusting limiting plate 81; the rotating shaft 82 is rotatably arranged in the machine shell 10 and the adjusting limiting plate 81 in a penetrating way; the spring 85 extends axially along the front-rear direction and is in a compressed state, so the spring 85 is a compression spring; the knob 83, the spring 85, the adjusting limiting plate 81 and the adjusting wheel 84 are sequentially arranged from front to back, a limiting protrusion protruding forward is arranged on the front end face of the adjusting wheel 84 facing the adjusting limiting plate 81, an eccentric shaft portion 841 eccentrically arranged with the rotating shaft 82 and extending backwards is arranged on the rear end face of the adjusting wheel 84 facing away from the adjusting limiting plate 81, and a limiting concave portion facing the adjusting wheel 84 and matched with the limiting protrusion is arranged on the rear end face of the adjusting limiting plate 81. When the knob 83 is pressed backward, the knob 83 drives the regulating wheel 84 to synchronously move backward through the rotating shaft 82, so that the limit protrusion on the regulating wheel 84 is separated from the limit recess on the regulating limit plate 81, at this time, the knob 83 drives the regulating wheel 84 to synchronously rotate through the rotating shaft 82 by operating the knob 83, and the height position of the eccentric shaft 841 is changed, so that the height position of the component acted by the eccentric shaft 841 can be regulated. After the adjustment is finished, the knob 83 is loosened, and because the spring 85 is in a compressed state, the spring 85 applies a forward acting force to the knob 83, the knob 83 moves forward to reset under the acting force of the spring 85, and then the knob 83 drives the adjusting wheel 84 to synchronously move forward to reset through the rotating shaft 82, so that the limit protruding part on the adjusting wheel 84 is matched with the limit concave part on the adjusting limit plate 81, the adjusting wheel 84 cannot rotate, the adjusting knob 80 is self-locked, and the knob 83 cannot rotate. Therefore, the adjusting knob 80 can quickly realize the separation and reunion between the adjusting wheel 84 and the adjusting limiting plate 81 by pressing or loosening the knob 83, and when the knob 83 is loosened, the whole adjusting knob 80 is in a self-locking state by matching the limiting protruding part on the adjusting wheel 84 with the limiting concave part on the adjusting limiting plate 81, so that the self-locking is reliable and stable; in addition, when the adjusting knob 80 is used for adjusting the height of the component, the knob 83 is only required to be pressed and turned, so that the operation is simple and quick.

The above-mentioned quick-clutch adjusting knob 80 is mainly used in the lifting presser foot height adjusting mechanism of the buttonholing machine in this application, at this time, as shown in fig. 7, the quick-clutch adjusting knob 80 is mounted on the front wall of the buttonholing machine casing 10, the adjusting limiting plate 81 is fixed with the inner wall of the casing 10, the knob 83 and the spring 85 are located outside the casing 10, and the adjusting limiting plate 81 and the adjusting wheel 84 are located inside the casing 10. As shown in fig. 8 to 10, the presser foot lifting height adjusting mechanism is installed in a casing 10 of the buttonholing machine, the casing 10 has a tail portion 101 and a head portion 102, wherein the tail portion 101 is located at the left end of the casing 10, and the head portion 102 is located at the right end of the casing 10; the presser foot lifting height adjusting mechanism comprises a presser foot lifting height adjusting assembly 70, a presser foot lifting driving assembly 30 arranged in the machine tail part 101, a swinging rod 40 arranged in the machine tail part 101 and provided with a first fixed swinging fulcrum O1, a transmission piece 50 extending leftwards and rightwards along the length direction of the machine shell 10, and a presser foot lifting executing assembly 60 arranged in the machine head part 102; the swing rod 40 extends vertically, the swing rod 40 is rotatably connected to the casing 10 through a fixing pin extending back and forth, or the swing rod 40 is rotatably connected to a fixing plate through a fixing pin extending back and forth, and the fixing plate is fixed to the casing 10, so the fixing pin is a first fixed swing fulcrum O1 of the swing rod 40; the presser foot lifting executing assembly 60 is provided with a vertically extending presser foot bar 61, and the lower end of the presser foot bar 61 extends downwards from the casing 10 and is fixedly provided with a presser foot; the presser foot lifting driving assembly 30 is connected with the lower end of the swing rod 40, drives the lower end of the swing rod 40 to swing, the upper end of the swing rod 40 is hinged with the left end of the transmission member 50, and the right end of the transmission member 50 is connected with the presser foot lifting executing assembly 60, and drives the presser foot bar 61 to move upwards or downwards, so that upward presser foot lifting or downward presser foot releasing can be realized; the eccentric shaft portion 841 of the quick-clutch adjusting knob 80 acts on the hinge point of the swing link 40 and the transmission member 50, and adjusts the height position of the hinge point of the swing link 40 and the transmission member 50. In the presser foot lifting height adjusting mechanism, except for the presser foot lifting height adjusting assembly 70, the presser foot lifting driving assembly 30, the swinging rod 40, the transmission piece 50 and the presser foot lifting executing assembly 60 form a presser foot lifting driving mechanism of the buttonholing machine.

When the knob 83 is pressed and rotated backward, the limit protrusion on the adjusting wheel 84 is separated from the limit recess on the adjusting limit plate 81, the knob 83 drives the adjusting wheel 84 to rotate synchronously through the rotating shaft 82, so that the height position of the eccentric shaft 841 is changed, the hinge point of the swing rod 40 and the transmission member 50 is moved up or down, the length between the hinge point of the swing rod 40 and the transmission member 50 and the first fixed swing pivot O1 of the swing rod 40 is adjusted, the swing amplitude of the transmission member 50 is further adjusted by the swing rod 40, and finally, the stroke of the presser foot lifting rod 61 in the presser foot lifting executing assembly 60 is adjusted by the transmission member 50, so that the presser foot lifting height adjustment is realized, the presser foot lifting driving mechanism can be suitable for cloth with different thicknesses, and normal work of a lock hole can be ensured, and higher working efficiency is ensured. Specifically, after the adjustment of the height of the presser foot is finished, in the operation process of the buttonholing machine, the presser foot lifting driving assembly 30 drives the lower end of the swing rod 40 to swing, so that the upper end of the swing rod 40 also swings; when the hinge point of the swing rod 40 and the transmission member 50 is located at a high position through the adjusting knob 80, the length between the hinge point of the swing rod 40 and the transmission member 50 and the first fixed swing pivot point O1 of the swing rod 40 is longer, so that the swing amplitude of the upper end of the swing rod 40 is larger, the stroke of the swing rod 40 for driving the presser foot lifting rod 61 in the presser foot lifting execution assembly 60 to move up or down through the transmission member 50 is increased, and the swing rod is suitable for thin materials; when the hinge point of the swing rod 40 and the transmission member 50 is located at the low position through the adjusting knob 80, the length between the hinge point of the swing rod 40 and the transmission member 50 and the first fixed swing pivot O1 of the swing rod 40 is shorter, so that the swing amplitude of the upper end of the swing rod 40 is smaller, and the stroke of the swing rod 40 for driving the presser foot lifting rod 61 in the presser foot lifting executing assembly 60 to move up or down through the transmission member 50 is reduced, so that the presser foot lifting executing assembly is suitable for thick materials.

In the above-mentioned presser foot lifting height adjusting mechanism, the transmission member 50 may be a connecting rod, or may be a wire rope, and in the presser foot lifting height adjusting mechanism shown in fig. 8 and 9, the transmission member 50 is a transmission connecting rod.

Further, as shown in fig. 1 to 3, the device further comprises a scale dial 86 fixed on the casing 10 and located outside the casing 10, so that the scale dial 86 is located between the knob 83 and the adjusting limiting plate 81, and a through hole 861 for allowing the spring 85 and the rotating shaft 82 to pass through is formed in the scale dial 86; the front surface of the scale dial 86 is provided with a scale for indicating the height of the presser foot, when the knob 83 is pressed backwards and rotated, the pointer on the knob 83 is aligned with a scale on the scale dial 86, and then the knob 83 is loosened, the pointer on the knob 83 is aligned with a new scale, the whole presser foot lifting height adjusting assembly 70 also realizes self-locking, and the operation of the presser foot lifting height adjustment is facilitated for operators. Preferably, the scale plate 86, the casing 10, and the adjusting limiting plate 81 are fixed by a plurality of fixing screws extending back and forth; the knob 83 is fixed to the rotating shaft 82, and the rotating shaft 82 and the adjusting wheel 84 are fixed by a plurality of fixing screws extending radially along the rotating shaft 82.

Preferably, as shown in fig. 2, a rearward extending guiding shaft 831 is provided on a rear end surface of the knob 83 facing the adjusting limiting plate 81, the spring 85 is sleeved on the rotating shaft 82, and a front end of the spring 85 is sleeved on the guiding shaft 831 of the knob 83, and a rear end of the spring 85 abuts against a front end surface of the casing 10, so that accuracy of forward movement and resetting of the knob 83 by the spring 85 after the knob 83 is released is improved.

In this application, the limit protrusion of the adjusting wheel 84 and the limit recess of the adjusting limit plate 81 have various forms: form one of the limit protrusion and the limit recess, as shown in fig. 2 and 3, the limit protrusion on the adjusting wheel 84 is a limit latch 842 extending forward, and the limit recess on the adjusting limit plate 81 is a plurality of limit holes 811; when the knob 83 is released, an end of the limit plug 842 is inserted into one of the limit holes 811, thereby restricting rotation of the adjustment wheel 84 and the knob 83; preferably, the adjusting limiting plate 81 is provided with two blocking pins 812 extending backward towards the rear end face of the adjusting wheel 84, the two blocking pins 812 are respectively located at two ends of the limiting recess, that is, the plurality of limiting holes 811 are located between the two blocking pins 812, and in the process that the knob 83 drives the adjusting wheel 84 to rotate, the blocking pins 812 are used for limiting the rotation of the limiting plug 842 on the adjusting wheel 84, so that the limiting plug 842 can only rotate within the range with the limiting holes 811, and the rotation range of the knob 83 is limited. As shown in fig. 4, the second form of the limiting protrusion and the limiting recess is a gear portion 843, and the limiting recess on the adjusting limiting plate 81 is a gear groove adapted to the gear portion 843; when the knob 83 is released, the gear portion 843 is located in the gear groove, thereby restricting the rotation of the adjustment wheel 84 and the knob 83. As shown in fig. 5 or 6, the limiting protrusion on the adjusting wheel 84 is a polygonal portion 844, and the limiting recess on the adjusting limiting plate 81 is a polygonal groove adapted to the polygonal portion 844; when the knob 83 is released, the polygonal portion 844 is positioned in the polygonal groove, thereby restricting rotation of the adjustment wheel 84 and the knob 83; preferably, the limit protrusion on the adjusting wheel 84 is a regular polygon, and the limit recess on the adjusting limit plate 81 is a regular polygon groove adapted to the regular polygon 844. Of course, the limit protrusion and the limit recess may also take other forms such as splines.

Further, as shown in fig. 8 to 10, the presser foot lifting height adjusting assembly 70 further includes a guide rail plate 71 which can move up and down, and a connecting pin 72 which extends back and forth; the rail 71 has a first rail arm 711 and a second rail arm 712 arranged in parallel, and the first rail arm 711 and the second rail arm 712 extend laterally along the longitudinal direction of the casing 10, so that the first rail arm 711 and the second rail arm 712 are arranged in front-rear opposition; the eccentric shaft 841 of the adjusting knob 80 is connected to the first rail plate arm 711 and drives the first rail plate arm 711 to move up and down; the second rail plate arm 712, the left end of the driving member 50, and the upper end of the swing link 40 are hinged by the connection pin 72, so the connection pin 72 is a hinge point between the swing link 40 and the driving member 50, a first chute 41 extending up and down along the length direction of the swing link 40 is provided in the swing link 40, a second chute 714 extending left and right along the length direction of the second rail plate arm 712 is provided in the second rail plate arm 712, the connection pin 72 is inserted into the first chute 41 and the second chute 714, and a retainer ring 42 located at the front side of the second rail plate arm 712 is fixed at the front end of the connection pin 72. When the eccentric shaft portion 841 of the adjusting knob 80 moves the first rail plate arm portion 711 up and down, the rail plate 71 moves up and down as a whole, so that the second rail plate arm portion 712 of the rail plate 71 also moves up and down synchronously, thereby driving the hinge points of the swing link 40, the transmission member 50 and the second rail plate arm portion 712 to move up and down synchronously, that is, adjusting the positions of the connecting pin 72 in the first chute 41 and the second chute 714, that is, adjusting the distance between the connecting pin 72 and the first fixed swing fulcrum O1 of the swing link 40.

Preferably, as shown in fig. 8 to 10, the presser foot lifting height adjusting assembly 70 further includes a mounting bracket 73, the mounting bracket 73 includes a mounting bracket fixing portion 731 fixed to the top of the casing 10, and a mounting bracket guide portion 732 provided with a first guide groove 733 extending up and down, the guide rail plate 71 further has a guide rail plate body portion 713 between the first guide rail plate arm portion 711 and the second guide rail plate arm portion 712, so that the guide rail plate body portion 713 extends forward and backward in the width direction of the casing 10, the first guide rail plate arm portion 711 is located at a front end of the guide rail plate body portion 713, and the second guide rail plate arm portion 712 is located at a rear end of the guide rail plate body portion 713; the guide bolts 74 are fixed on the guide rail plate body 713, the guide bolts 74 are inserted into the first guide grooves 733 of the mounting frame guide parts 732, the heads of the guide bolts 74 are positioned outside the first guide grooves 733, the guide bolts 74 form the tracks of the guide rail plate 71, and the accuracy and stability of the vertical movement of the guide rail plate 71 driven by the adjusting knob 80 can be improved through the mutual matching of the guide bolts 74 and the first guide grooves 733, so that the accuracy and precision of the height adjustment of the presser foot are improved. The first rail plate arm 711 is provided with a third sliding groove 715 extending leftwards and rightwards along the length direction of the first rail plate arm 711, and the eccentric shaft portion 841 is arranged in the third sliding groove 715 in a penetrating manner; when the knob 83 is turned, the eccentric shaft 841 drives the first rail plate arm 711 to move up and down, and the eccentric shaft 841 also slides left and right in the third chute 715, so as to adjust the height of the hinge point between the swing rod 40 and the transmission member 50, thereby realizing the height adjustment of the presser foot.

Further, as shown in fig. 10 and 11, the presser foot lifting driving assembly 30 includes a rotating member 31 having a cam circumferential surface 311, a driving crank 32 having a second fixed swing fulcrum O2, a roller 33, an adapter 34, and a fixing pin 35 fixed at the lower end of the swing lever 40; the fixing pin 35 extends back and forth in the width direction of the casing 10; the adapter 34 includes an adapter body portion 341, and an adapter shaft portion 342 extending vertically downward from a lower end of the adapter body portion 341; the rotating member 31 is directly or indirectly driven to rotate by a power source, the roller 33 is rotatably connected to one end of the driving crank 32 and abuts against the cam circumferential surface 311 of the rotating member 31, the adaptor shaft 342 is rotatably and axially movably inserted into the rear end of the driving crank 32, and the fixing pin 35 is rotatably and axially movably inserted into the adaptor body 341.

In this embodiment, the power source is a driving motor 20 vertically installed in the tail 101, so it may be built in the casing 10, and further the presser foot lifting driving mechanism of the buttonholing machine may be integrally built in the casing 10 of the buttonholing machine, so as to simplify the overall structure of the presser foot lifting driving mechanism, reduce the occupation space thereof, and greatly improve the overall aesthetic property of the buttonholing machine. In addition, after the driving motor 20 is vertically installed and is built in the casing 10, the driving motor 20 is adopted by the power sources of other mechanisms (such as an upper thread cutting mechanism and a lower thread cutting mechanism) in the buttonholing machine conveniently, namely, the presser foot lifting driving mechanism and the other mechanisms can share one driving motor 20 and the same motor shaft, so that the cost of the whole buttonholing machine is reduced.

The driving motor 20 may be directly connected to the rotating member 31 to directly drive the rotating member 31 to rotate; the driving motor 20 may be indirectly connected to the rotating member 31 through a gear, a timing belt, or other transmission mechanism, to indirectly drive the rotating member 31 to rotate; in this embodiment, the rotating member 31 is fixed on the output shaft of the driving motor 20, so the driving motor 20 directly drives the rotating member 31 to rotate. The driving motor 20 may be directly fixed to the casing 10, or may be fixed by providing a motor mounting plate 36; in this embodiment, as shown in fig. 8 to 10, a motor mounting plate 36 fixed to the casing 10 is disposed in a tail portion 101 of the casing 10, the driving motor 20 is vertically fixed on a lower end surface of the motor mounting plate 36, and an output shaft of the driving motor 20 extending vertically passes through the motor mounting plate 36 upwards and is fixed in the rotating member 31, so that the rotating member 31 is rotatably supported on an upper end surface of the motor mounting plate 36; the fixing plate for mounting the swing link 40 is located at the rear side of the motor mounting plate 36. Further, as shown in fig. 4, the driving crank 32 includes a crank body 321, a first crank arm portion 322 extending substantially forward from the outer periphery of the crank body 321, and a second crank arm portion 323 extending substantially rearward from the outer periphery of the crank body 321, the crank body 321 of the driving crank 32 is rotatably connected to the motor mounting plate 36 by a vertically extending rocker pin 37, so that the rocker pin 37 forms a second fixed pivot point O2 of the driving crank 32, the roller 33 is rotatably connected to the front end of the first crank arm portion 322 of the driving crank 32 by a vertically extending screw 39, and the adapter shaft portion 342 of the adapter 34 is rotatably and vertically axially movably penetrating the rear end of the second crank arm portion 323 of the driving crank 32. The lower extreme of drive crank 32 is equipped with a torsional spring 38, the both ends of torsional spring 38 are connected in second crank arm 323 and motor mounting panel 36 respectively, and torsional spring 38 is used for exerting an effort to drive crank 32 for the front end of drive crank 32 is close to rotor 31, thereby makes the roller 33 of drive crank 32 front end hug closely in the cam global 311 of rotor 31 all the time, guarantees the accuracy and the reliability of force transmission.

Further, as shown in fig. 17, the rotating member 31 is directly a cam, and the outer peripheral surface of the cam constitutes the cam peripheral surface 311. Alternatively, as shown in fig. 18, the rotating member 31 is a cylinder, the outer circumferential surface of the cylinder is provided with a cam groove 312, the groove circumferential surface of the cam groove 312 forms the cam circumferential surface 311, and in order to realize that the other mechanism of the buttonholing machine and the presser foot lifting mechanism share one driving motor 20, the rotating member 31 is preferably in a cylinder shape, and by combining the structure that the driving motor 20 and the rotating member 31 are both built in the casing 10, the other mechanism of the buttonholing machine can be conveniently driven by providing grooves on the upper end surface and the lower end surface of the rotating member 31.

Further, as shown in fig. 10 and 12, the presser foot lifting and lowering execution assembly 60 includes a presser foot lifting and lowering swing lever 62 having a third fixed swing fulcrum O3, a presser foot lifting and lowering link 63, a guide plate 64 fixed to the casing 10, and a bracket 65, wherein the guide plate 64 is provided with a second guide groove 641 extending vertically; a slide block 651 protruding forwards is arranged on the front end surface of the bracket 65, and the presser foot bar 61 is fixed in the bracket 65; the presser foot lifting and lowering swinging rod 62 is substantially L-shaped, the right end of the transmission member 50 is hinged to the upper end of the left side of the presser foot lifting and lowering swinging rod 62, the lower end of the right side of the presser foot lifting and lowering swinging rod 62 is hinged to the upper end of the presser foot lifting and lowering connecting rod 63, the lower end of the presser foot lifting and lowering connecting rod 63 is hinged to the slider 651, and the slider 651 is located in the second guide groove 641 of the guide plate 64 and can slide up and down in the second guide groove 641, namely, the presser foot lifting and lowering swinging rod 62, the presser foot lifting and lowering connecting rod 63, the bracket 65 with the slider 651, and the guide plate 64 with the second guide groove 641 form a crank slider mechanism. The transmission member 50 is hinged to the presser foot lifting/lowering swing lever 62, and the presser foot lifting/lowering swing lever 62 and the presser foot lifting/lowering link 63 are each hinged to each other by an axial screw 66 extending in the front-rear direction.

Preferably, as shown in fig. 10 and 12, the presser foot lifting link 63 is provided with an adjusting slot 631 extending up and down, and the axial screw 66 for hinging the presser foot lifting swing lever 62 and the presser foot lifting link 63 is inserted into the adjusting slot 631; the presser bar 61 is sleeved with a compression spring, which is not shown in the drawing, and the upper and lower ends of the compression spring respectively abut against the casing 10 and the bracket 65. In the process of lifting and releasing the presser foot, the presser foot is not contacted with the cloth, so that the pressure of the pressure spring fully acts on the bracket 65, and the axial screw 66 penetrating through the adjusting groove 631 always abuts against the upper edge of the adjusting groove 631, thereby accurately executing the presser foot lifting action and the presser foot releasing action. When the presser foot is put down, the presser foot contacts with the cloth, and the pressure of the pressure spring is borne by the cloth and the needle plate, so that the axial screw 66 penetrating the adjusting groove 631 is loosened from the upper edge of the adjusting groove 631. Since the adjusting groove 631 is a vertically extending elongated groove, it enables the presser foot lifting driving mechanism to be adapted to different thickness cloths, and also facilitates adjustment of the stroke of the presser foot bar 61 to move up or down.

Fig. 13 is a schematic diagram of the presser foot height adjusting mechanism in the present application, which is compared with the structure diagrams of the presser foot height adjusting mechanism shown in fig. 8 to 10, the driving crank 32 is K-J-I, the adapter 34 is I-H, the swing bar 40 is H-G-F, the connecting pin 72 is F, the second chute 714 on the arm 712 of the second rail plate is F-M, the mounting bracket 73 is P-Q, the adjusting knob 80 is O-N, the knob 83 in the adjusting knob 80 is O, the eccentric shaft 841 in the adjusting knob 80 is N, the transmission member 50 is F-E, the presser foot lifting swing plate is E-a-B, the presser foot lifting link 63 is B-C, the presser foot bar 61 is C-D, the presser foot J is the second fixed swing pivot O2 of the driving crank 32, G is the first fixed swing pivot O1 of the swing bar 40, and a is the third fixed swing pivot O3 of the presser foot lifting swing bar 62. As can be seen from fig. 13: when the swing link 40 (H-G-F) swings driven by the driving crank 32 (K-J-I) and the adapter 34 (I-H), the connection pin 72 (F) can slide along the second slide groove 714 (F-M); the height of the guide rail plate 71 where the second sliding groove 714 (F-M) is located can move up and down along the mounting frame 73 (P-Q) through the adjusting knob 80 (O-N), when the guide rail plate 71 where the second sliding groove 714 (F-M) is located is in a high position, F-G is longer, the swing amplitude of the F point is also larger, and the transmission member 50 (F-E) drives the presser foot bar 61 (C-D) to move up or down to form larger, so that the presser foot lifting height is higher; conversely, when the guide rail plate 71 where the second chute 714 (F-M) is located is in the low position, F-G is shorter, and the swing amplitude of the point F is smaller, the formation that the transmission member 50 (F-E) drives the presser foot bar 61 (C-D) to move up or down is smaller, and the height of the presser foot is lower; after the adjustment is finished, the N point is locked, the height of the presser foot is kept fixed, or the heights of the N point and the F-M are changed only when the height of the presser foot is required to be adjusted, and the heights of the N point and the F-M are kept fixed in the rest states. The shape of the second chute 714 (F-M) may be an arc, spline, straight line or oblique line, as long as the presser foot lifting height adjusting mechanism can meet the use requirement. The connecting pin 72F may be in direct contact with the groove wall of the second sliding groove 714 (F-M) on the second rail plate arm 712, or may be in indirect contact by sleeving a rotatable slider on the outer periphery of the connecting pin 72.

Further, in the schematic diagram of the presser foot lifting height adjustment mechanism shown in fig. 13, the height position of the guide rail plate 71 where the second chute 714F-M is located is controlled by the external action point N, and the controlled manner of the point N in the presser foot lifting height adjustment assembly 70 shown in fig. 13 is: by means of the eccentric shaft portion 841 of the adjustment knob 80, which may also be realized in other ways; such as: in the presser foot height adjustment assembly 70 shown in fig. 14, the controlled manner of point N is: realized by thread adjustment; alternatively, in the presser foot height adjustment assembly 70 shown in fig. 15 and 16, the controlled manner of point N is: the height adjustment of the presser foot is realized by realizing the T-O-N of the spanner, wherein O is a fixed swinging fulcrum of the spanner, the T end is positioned outside the shell 10, and the N end of the spanner can be driven to move upwards or downwards by pulling the T end of the spanner.

Further, as shown in fig. 10 and 13, the rotating member 31 has a rotation center L, the cam circumferential surface 311 on the rotating member 31 includes a first arc segment 313 with a constant diameter, a second arc segment 314 with a gradually increasing diameter, and a third arc segment 315 with a gradually decreasing diameter, the second arc segment 314 and the third arc segment 315 are eccentric to the rotation center L of the rotating member 31, that is, the second arc segment 314 and the third arc segment 315 are eccentric to the output shaft of the driving motor 20, the first arc segment 313 is concentrically arranged with the output shaft of the driving motor 20, the first arc segment 313, the second arc segment 314 and the third arc segment 315 are sequentially connected, and the second arc segment 314 and the third arc segment 315 are symmetrically arranged. When the roller 33 contacts the first arc section 313 of the cam circumferential surface 311, the drive crank 32 is not operated, and the presser foot is in a lowered state, in which the buttonholing machine performs a sewing operation and a thread cutting operation. When the roller 33 contacts with the second arc section 314 of the cam circumferential surface 311, the driving crank 32 swings clockwise around the second fixed swinging fulcrum O2, the driving crank 32 drives the swinging rod 40 to swing anticlockwise around the first fixed swinging fulcrum O1 through the adapter 34, the swinging rod 40 drives the presser foot lifting swinging rod 62 to swing anticlockwise around the third fixed swinging fulcrum O3 through the transmission piece 50, the presser foot lifting connecting rod 63 and the bracket 65 are driven to move upwards together under the interaction of the second guide groove 641 and the sliding block 651, and the presser foot rod 61 and the presser foot are driven to move upwards synchronously, so that the presser foot is lifted. When the roller 33 contacts with the third arc section 315 of the cam circumferential surface 311, the driving crank 32 swings anticlockwise around the second fixed swinging fulcrum O2, the driving crank 32 drives the swinging rod 40 to swing clockwise around the first fixed swinging fulcrum O1 through the adapter 34, the swinging rod 40 drives the presser foot lifting swinging rod 62 to swing clockwise around the third fixed swinging fulcrum O3 through the transmission piece 50, the presser foot lifting connecting rod 63 and the bracket 65 are driven to move downwards together under the interaction of the second guide groove 641 and the sliding block 651, and the presser foot rod 61 and the presser foot are driven to move downwards synchronously, so that the presser foot is released. Thus, the first arc segment 313 is a presser foot lifting idle stroke segment, the second arc segment 314 is a presser foot lifting idle stroke segment, and the third arc segment 315 is a presser foot releasing idle stroke segment.

In summary, the quick-clutch adjusting knob 80 according to the present invention has a quick clutch and self-locking function, so that an operator can quickly and easily adjust the height of the presser foot. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.

The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims

1. The utility model provides a lift presser foot height adjustment mechanism installs in casing (10), its characterized in that: the presser foot lifting height adjusting mechanism comprises a presser foot lifting height adjusting assembly (70), a presser foot lifting driving assembly (30) arranged in a machine shell (10), a swinging rod (40) arranged in the machine shell (10) and provided with a first fixed swinging fulcrum (O1), a transmission part (50) extending along the length direction of the machine shell (10) and a presser foot lifting executing assembly (60) arranged in the machine shell (10), wherein the presser foot lifting executing assembly (60) is internally provided with a presser foot rod (61), the presser foot lifting driving assembly (30) is connected with one end of the swinging rod (40) and drives one end of the swinging rod (40) to swing, the other end of the swinging rod (40) is hinged with one end of the transmission part (50), the other end of the transmission part (50) is connected with the presser foot lifting executing assembly (60) and drives the presser foot rod (61) to move upwards or downwards, the presser foot lifting height adjusting assembly (70) comprises a rapidly clutchable adjusting knob (80), the rapidly clutchable adjusting knob (80) comprises a position-fixed limiting plate (81), a rotating shaft (82) rotatably arranged in the adjusting plate (82), a rotating shaft (82) rotatably penetrates the adjusting plate (82), a rotating shaft (82) is fixed between the rotating shaft (81) and the rotating shaft (82) which are fixed between the adjusting plate (81), the spring (85) is in a compressed state, a limiting protruding part is arranged on one end face, facing the adjusting limiting plate (81), of the adjusting wheel (84), an eccentric shaft part (841) eccentrically arranged with the rotating shaft (82) is arranged on the other end face, facing the adjusting limiting plate (81), of the adjusting wheel (84), a limiting concave part which faces the adjusting wheel (84) and is matched with the limiting protruding part is arranged on the adjusting limiting plate (81), the adjusting limiting plate (81) is fixed on the inner wall of the shell (10), and the knob (83) is positioned outside the shell (10); when the knob (83) is pressed and the adjusting wheel (84) is driven to rotate through the rotating shaft (82), the eccentric shaft (841) enables the hinge point of the swing rod (40) and the transmission piece (50) to move upwards or downwards; when the knob (83) is pressed, a limit protruding part on the adjusting wheel (84) is separated from a limit recessed part on the adjusting limit plate (81), and the knob (83) drives the adjusting wheel (84) to rotate through the rotating shaft (82); when the knob (83) is loosened, the limit protruding part on the adjusting wheel (84) is matched with the limit concave part on the adjusting limit plate (81), and the adjusting knob (80) is self-locked.

2. The presser foot elevation adjustment mechanism of claim 1 wherein: the quick-clutch adjusting knob (80) further comprises a scale dial (86) which is fixed in position and provided with scales, the scale dial (86) is positioned between the knob (83) and the adjusting limiting plate (81), and a through hole (861) through which the containing spring (85) and the rotating shaft (82) penetrate is formed in the scale dial (86).

3. The presser foot elevation adjustment mechanism of claim 1 wherein: a guide shaft part (831) is arranged on one end surface of the knob (83) facing the adjusting limiting plate (81), the spring (85) is sleeved on the rotating shaft (82), and one end of the spring (85) is sleeved on the guide shaft part (831) of the knob (83).

4. The presser foot elevation adjustment mechanism of claim 1 wherein: the limiting protruding part on the adjusting wheel (84) is a limiting bolt (842), and the limiting concave part on the adjusting limiting plate (81) is a plurality of limiting holes (811); when the knob (83) is released, an end of the limit plug (842) is inserted into one limit hole (811) of the plurality of limit holes (811).

5. The presser foot elevation adjustment mechanism of claim 4 wherein: two stop pins (812) are arranged on one end face, facing the adjusting wheel (84), of the adjusting limiting plate (81), and the two stop pins (812) are respectively located at two ends of the limiting concave part and used for limiting rotation of the limiting plug pins (842).

6. The presser foot elevation adjustment mechanism of claim 1 wherein: the limiting protruding part on the adjusting wheel (84) is a gear part (843), and the limiting concave part on the adjusting limiting plate (81) is a gear groove matched with the gear part (843); when the knob (83) is released, the gear portion (843) is located in the gear groove.

7. The presser foot elevation adjustment mechanism of claim 1 wherein: the limiting protruding part on the adjusting wheel (84) is a polygonal part (844), and the limiting concave part on the adjusting limiting plate (81) is a polygonal groove matched with the polygonal part (844); when the knob (83) is released, the polygonal portion (844) is located in the polygonal slot.

8. The presser foot elevation adjustment mechanism of claim 1 wherein: the presser foot lifting height adjusting assembly (70) further comprises a guide rail plate (71) capable of moving up and down and a connecting pin (72), the guide rail plate (71) is provided with a first guide rail plate arm part (711) and a second guide rail plate arm part (712) which are arranged in parallel, one end of the second guide rail plate arm part (712), one end of the transmission piece (50) and the other end of the swinging rod (40) are hinged through the connecting pin (72), a first sliding groove (41) extending along the length direction of the swinging rod (40) is formed in the swinging rod (40), a second sliding groove (714) extending along the length direction of the second guide rail plate arm part (712) is formed in the second guide rail plate arm part (712), and the connecting pin (72) is arranged in the first sliding groove (41) and the second sliding groove (714) in a penetrating mode; the first rail plate arm (711) is provided with a third sliding groove (715) extending along the length direction of the first rail plate arm (711), and the eccentric shaft portion (841) is arranged in the third sliding groove (715) in a penetrating manner.

9. The presser foot elevation adjustment mechanism of claim 8, wherein: the presser foot lifting height adjusting assembly (70) further comprises a mounting frame (73), the mounting frame (73) comprises a mounting frame fixing portion (731) fixed with the machine shell (10) and a mounting frame guide portion (732) provided with a first guide groove (733) extending up and down, the guide rail plate (71) further comprises a guide rail plate body portion (713) located between the first guide rail plate arm portion (711) and the second guide rail plate arm portion (712), a guide bolt (74) is fixed on the guide rail plate body portion (713), and the guide bolt (74) is arranged in the first guide groove (733) of the mounting frame guide portion (732) in a penetrating mode.