CN108118469B - Buttonhole sewing machine - Google Patents

Abstract

The invention provides a buttonholing machine which comprises an upper thread trimming mechanism for trimming a thread and a presser foot lifting mechanism for lifting a presser foot, wherein the upper thread trimming mechanism comprises an upper thread trimming driving assembly and an upper thread trimming executing assembly which is connected with the upper thread trimming driving assembly and driven by the upper thread trimming driving assembly to act, the presser foot lifting mechanism comprises a presser foot lifting driving assembly and a presser foot lifting executing assembly which is connected with the presser foot lifting driving assembly and driven by the presser foot lifting driving assembly to act, and the upper thread trimming driving assembly and the presser foot lifting driving assembly are driven by the same driving motor to act. In the buttonholing machine, the upper thread trimming mechanism and the presser foot lifting mechanism can be driven to act simultaneously by only using one driving motor, so that the structure and the electric control of the buttonholing machine are greatly simplified and optimized, and the manufacturing cost of the buttonholing machine can be greatly reduced.

Description

Buttonhole sewing machine

Technical Field

The invention relates to clothing sewing equipment, in particular to a buttonholing machine.

Background

The buttonhole machine is one type of industrial sewing machine, belongs to special machine and is used mainly in making buttonhole in various kinds of clothing. With the continuous development of the technology, the buttonholing machine is developed towards the direction of semi-automation and full automation, so that the functions of the buttonholing machine are more and more complete, for example, the buttonholing machine can realize the functions of automatic thread cutting, automatic presser foot lifting, automatic sewing and the like. Therefore, the buttonholing machine is provided with an upper thread trimming mechanism for trimming upper threads, a lower thread trimming mechanism for trimming lower threads and a presser foot lifting mechanism for lifting a presser foot. At present, an upper thread trimming mechanism, a lower thread trimming mechanism and a presser foot lifting mechanism are respectively driven by three motors, so that automatic thread trimming, automatic bottom thread trimming and automatic presser foot lifting are respectively realized, and therefore, the mechanical structure and the electric control of the buttonholing machine with the structure are very complex, the electric control failure rate is extremely high, and the cost is also high.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a buttonholing machine that uses one motor to drive two mechanisms, thereby simplifying the structure and reducing the cost.

In order to achieve the purpose, the invention provides a buttonholing machine which comprises an upper thread trimming mechanism for trimming a thread and a presser foot lifting mechanism for lifting a presser foot, wherein the upper thread trimming mechanism comprises an upper thread trimming driving component and an upper thread trimming executing component which is connected with the upper thread trimming driving component and driven by the upper thread trimming driving component to act, the presser foot lifting mechanism comprises a presser foot lifting driving component and a presser foot lifting executing component which is connected with the presser foot lifting driving component and driven by the presser foot lifting driving component to act, and the upper thread trimming driving component and the presser foot lifting driving component are driven by the same driving motor to act.

The device further comprises an upper cam, the upper cam is directly or indirectly driven to rotate by a driving motor, and the upper trimming line driving assembly and the lifting and pressing foot driving assembly are connected with the upper cam.

Preferably, the driving motor is vertically installed and has a motor output shaft extending up and down, and the upper end of the motor output shaft of the driving motor extends upwards from a motor shell of the driving motor and then is fixed with the upper cam.

Furthermore, the upper thread trimming executing assembly comprises a first rocker, a second rocker and an upper scissors assembly for trimming upper threads, and the upper thread trimming driving assembly comprises a first upper thread trimming cam chute and a second upper thread trimming cam chute which are arranged on the upper cam, a first upper thread trimming driving rod group and a second upper thread trimming driving rod group; the first upper trimming cam chute and the second upper trimming cam chute are both in a closed curve shape, and each of the first upper trimming cam chute and the second upper trimming cam chute comprises an upper trimming cutting section, an upper trimming to-be-cut section, an upper trimming cutting section and an upper trimming resetting section which are sequentially connected end to end; the first upper trimming driving rod group is provided with a rotatable first upper trimming roller, the first upper trimming roller is embedded into a first upper trimming cam sliding groove of the upper cam and is matched with the first upper trimming cam sliding groove, and the tail end of the first upper trimming driving rod group is hinged with a first rocker and is used for controlling the opening and closing of the upper scissor assembly; the second upper trimming driving rod group is provided with a rotatable second upper trimming roller, the second upper trimming roller is embedded into a second upper trimming cam sliding groove of the upper cam and matched with the second upper trimming cam sliding groove, and the tail end of the second upper trimming driving rod group is hinged with the second rocker and used for controlling the upper trimmer assembly to move.

Furthermore, the first upper trimming driving rod group comprises a first upper trimming driving crank and a first upper trimming connecting rod which is bent and extended, one end of the first upper trimming driving crank is provided with a first fixed swing fulcrum, the other end of the first upper trimming driving crank is hinged with one end of the first upper trimming connecting rod, the other end of the first upper trimming connecting rod is hinged with the first rocker, and the first upper trimming roller is rotatably installed on the first upper trimming driving crank.

Furthermore, the second upper trimming driving rod group comprises a second upper trimming driving crank and a second upper trimming connecting rod which is bent and extended, one end of the second upper trimming driving crank is provided with a second fixed swing fulcrum, the other end of the second upper trimming driving crank is hinged with one end of the second upper trimming connecting rod, the other end of the second upper trimming connecting rod is hinged with the second rocker, and the second upper trimming roller is rotatably installed on the second upper trimming driving crank.

Preferably, the first upper trimming cam sliding groove and the second upper trimming cam sliding groove are respectively formed on the upper end surface and the lower end surface of the upper cam.

Further, the change rule of the radius of the first upper trimming cam chute is as follows: the radius of the upper trimming line cutting section is gradually reduced and then gradually increased, the radius of the upper trimming line section to be cut is gradually reduced and then gradually increased, the radius of the upper trimming line cutting section is gradually reduced, the tail end of the upper trimming line section is provided with the minimum radius of the first upper trimming line cam sliding groove, and the radius of the upper trimming line resetting section is unchanged and then gradually increased.

Further, the change rule of the radius of the second upper trimming cam chute is as follows: the radius of the upper trimming line cutting section is firstly unchanged and then gradually reduced, the radius of the upper trimming line section to be trimmed is firstly gradually increased and then unchanged, the radius of the upper trimming line cutting section is gradually increased, the tail end of the upper trimming line section is provided with the maximum radius of the second upper trimming line cam sliding groove, and the radius of the upper trimming line resetting section is gradually reduced.

Preferably, the first upper trimming cam sliding groove and the second upper trimming cam sliding groove both further include an upper trimming idle stroke section, the upper trimming idle stroke section is located between the upper trimming resetting section and the upper trimming cutting section, and a radius of the upper trimming idle stroke section is unchanged.

Further, the presser foot lifting execution assembly is provided with a presser foot rod, the presser foot lifting driving assembly comprises a presser foot lifting cam chute arranged on the upper cam, a presser foot lifting driving crank with a sixth fixed swing fulcrum, a presser foot lifting roller rotatably connected to one end of the presser foot lifting driving crank, a presser foot lifting swing rod with one end connected to the other end of the presser foot lifting driving crank and a seventh fixed swing fulcrum, and a transmission member, the presser foot lifting cam chute is in a closed curve shape, the presser foot lifting roller is embedded into the presser foot lifting cam chute of the upper cam and matched with the presser foot lifting cam chute, one end of the transmission member is hinged to the other end of the presser foot lifting swing rod, and the other end of the transmission member is connected with the presser foot lifting execution assembly and drives the presser foot rod to move upwards or downwards.

Preferably, the pressure foot lifting driving crank is connected with the pressure foot lifting swing rod through a connecting piece, the connecting piece comprises a connecting piece body part and a connecting piece shaft part vertically and downwardly extending from the lower end of the connecting piece body part, a pressure foot lifting fixing pin extending forwards and backwards is fixed in one end of the pressure foot lifting swing rod, the connecting piece shaft part is rotatably and axially movably arranged in the other end of the pressure foot lifting driving crank in a penetrating mode, and the pressure foot lifting fixing pin is rotatably and axially movably arranged in the connecting piece body part in a penetrating mode.

Preferably, the lower end of the presser foot lifting driving crank is provided with a torsion spring, and the torsion spring enables the presser foot lifting roller to be tightly attached to the groove peripheral surface of the presser foot lifting cam sliding groove.

Further, the presser foot lifting execution assembly comprises a presser foot lifting swing rod with an eighth fixed swing fulcrum, a presser foot lifting connecting rod, a guide plate with relatively fixed positions and a support, wherein a first guide groove extending up and down is formed in the guide plate, a protruding sliding block is arranged on the support, the presser foot rod is fixed in the support, the other end of the transmission piece is hinged with one end of the presser foot lifting swing rod, the other end of the presser foot lifting swing rod is hinged with the upper end of the presser foot lifting connecting rod, the lower end of the presser foot lifting connecting rod is hinged with the sliding block, and the sliding block is located in the first guide groove of the guide plate and can slide up and down in the first guide groove.

Preferably, an adjusting groove extending up and down is formed in the presser foot lifting connecting rod, and the presser foot lifting swinging rod is hinged with the presser foot lifting connecting rod through a shaft position screw penetrating in the adjusting groove; the presser bar is sleeved with a pressure spring, and the upper end and the lower end of the pressure spring are respectively abutted against the shell and the support of the buttonholing machine.

Further, the presser foot lifting mechanism further comprises a presser foot lifting height adjusting assembly acting on a hinge point of the presser foot lifting swing rod and the transmission piece, and the presser foot lifting height adjusting assembly is used for adjusting the height position of the hinge point of the presser foot lifting swing rod and the transmission piece.

Preferably, the presser foot lifting height adjusting assembly comprises a guide rail plate capable of moving up and down, an operating member for driving the guide rail plate to move 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, the operating member is connected with the first guide rail plate arm part, the second guide rail plate arm part, one end of the transmission member and the other end of the presser foot lifting swing rod are hinged through the connecting pin, a first sliding groove extending along the length direction of the presser foot lifting swing rod is formed in the presser foot lifting swing 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.

Preferably, the presser foot lifting height adjusting assembly further includes a mounting bracket, the mounting bracket includes a mounting bracket fixing portion fixed to the housing of the buttonholing machine and a mounting bracket guide portion provided with a second guide groove extending vertically, the guide rail plate further includes 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 to the guide rail plate body portion, and the guide bolt is inserted into the second guide groove of the mounting bracket guide portion.

Furthermore, the operating element is an adjusting knob capable of being quickly clutched, the adjusting knob comprises an adjusting limiting plate with a fixed position, a rotating shaft which is rotatably arranged in the adjusting limiting plate in a penetrating mode, 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, the spring is in a compressed state, a limiting protruding part is arranged on one end face, facing the adjusting limiting plate, of the adjusting wheel, an eccentric shaft part which is eccentrically arranged with the rotating shaft is arranged on the other end face, facing away from the adjusting limiting plate, of the adjusting wheel, and a limiting concave part which faces the adjusting wheel and is matched with the limiting; when the knob is pressed, the limiting protruding part on the adjusting wheel is separated from the limiting concave part on the adjusting limiting plate, and the knob drives the adjusting wheel to rotate through the rotating shaft; when the knob is loosened, the limiting protruding part on the adjusting wheel is matched with the limiting concave part on the adjusting limiting plate, and the adjusting knob is self-locked.

Preferably, the limiting projection 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 in the plurality of limiting holes.

Preferably, two stop pins are arranged on one end face, facing the adjusting wheel, of the adjusting limiting plate, and the two stop pins are located at two ends of the limiting concave portion respectively and used for limiting rotation of the limiting bolt.

As described above, the buttonholing machine according to the present invention has the following advantageous effects:

in the buttonholing machine, the upper thread trimming mechanism and the presser foot lifting mechanism can be driven to act simultaneously by only using one driving motor, so that the structure and the electric control of the buttonholing machine are greatly simplified and optimized, the manufacturing cost of the buttonholing machine can be greatly reduced, and the buttonholing machine has a very good application prospect.

Drawings

Fig. 1 is a schematic structural diagram of a buttonholing machine according to the present application.

Fig. 2 is a schematic structural view of fig. 1 without the housing.

Fig. 3 is a schematic structural diagram of an upper thread trimming mechanism in the present application.

Fig. 4 is a schematic structural view of the first upper trimming driving rod set in fig. 3.

Fig. 5 is a schematic structural view of the second upper trimming driving rod set in fig. 3.

Fig. 6 is a schematic structural view of the first upper trimming cam chute of fig. 3.

Fig. 7 is a schematic structural view of the second upper trimming cam chute of fig. 3.

Fig. 8 is a graph showing a change in radius of the first upper trimming cam groove and the second upper trimming cam groove in the present application.

Fig. 9 and 10 are schematic structural views of the lower thread trimming mechanism in the present application, in which the driving motor is not shown.

Fig. 11 is a bottom view of fig. 9.

Fig. 12 is a bottom view of the lower cam of fig. 9, that is, a structural schematic diagram of the first lower trimming cam runner and the second lower trimming cam runner.

Fig. 13 is a graph showing the change of radius of the first lower trimming cam runner and the second lower trimming cam runner in the present application.

Fig. 14 and 15 are schematic structural views of the presser foot lifting mechanism in different viewing angles.

Fig. 16 is an exploded view of fig. 15.

Fig. 17 is a schematic view of the presser foot lift drive assembly of fig. 15.

Fig. 18 is a schematic view of the lift foot actuator assembly of fig. 15.

Fig. 19 is a schematic diagram of a presser foot lifting mechanism in the present application.

Fig. 20 and 21 illustrate different embodiments of the lift foot height adjustment assembly of fig. 19.

Fig. 22 is a side view of fig. 21.

Fig. 22 is a schematic view of the structure of the cam runner of the presser foot lift in the present application.

Fig. 23 is a diagram showing a change in the trajectory of the cam runner of the presser foot lift in the present application.

Fig. 24 is a schematic structural diagram of a quick-clutching adjusting knob in the present application.

Fig. 25 and 26 are exploded views of fig. 24.

Fig. 27-29 are different embodiments of the limit tab of fig. 26.

Fig. 30 is a diagram showing the change of the trajectory of the first upper trimming cam chute, the second upper trimming cam chute, the first lower trimming cam chute, the second lower trimming cam chute, and the presser foot lifting cam chute when the driving motor rotates by one revolution.

Fig. 31 is a timing chart showing the operation of the upper thread trimming mechanism, the lower thread trimming mechanism and the presser foot lifting mechanism when the driving motor rotates one revolution.

Description of the element reference numerals

1 go up trimming mechanism 37 and lift presser foot height adjustment subassembly

11 upper trimming drive assembly 38 guide rail plate

12 first upper shear line drive rod group 381 first guide rail plate arm part

121 first upper shear line roller 382 second guide plate arm portion

122 first upper trimming drive crank 383 to guide the track plate body part

123 first upper trimming connecting rod 384 second sliding groove

13 third sliding groove of second upper trimming driving rod group 385

131 second upper trimming roller 39 mounting rack

132 second upper trimming driving crank 391 mounting rack fixing part

133 second upper shear link 392 mount guide

Second guide groove of 14 upper trimming executing component 393

141 first rocker 310 guide bolt

142 second rocker 311 connecting pin

Cam on 143 upper scissor assembly 4

2 lower trimming mechanism 41 first upper trimming cam chute

21 lower trimming drive assembly 42 second upper trimming cam runner

22 first lower thread cutting driving rod set 43 upper thread cutting section

221 first lower trimming roller 44 for trimming the to-be-trimmed section

222 first lower trimming drive crank 45 upper trimming segment

223 first crank connecting rod 46 upper trimming reset section

224 section of idle stroke of trimming line on the second crank connecting rod 47

23 second lower trimming drive rod group 48 pressure raising and pressing foot cam chute

231 second lower trimming roller 481 pressure lifting foot idle stroke section

232 second lower trimming drive crank 482 pressure foot lifting section

233 third crank connecting rod 483 presser foot placing section

234 lower shear line connecting rod 5 lower cam

24 lower trimming actuating assembly 51 first lower trimming cam chute

241 first scissors control plate 52 first lower trimming cam chute

242 first scissors control panel 53 lower trimming cutting section

3 lift presser foot mechanism 54 lower trimming and wait to cut section

31 lift presser foot drive assembly 55 lower thread trimming and trimming segment

32 lift presser foot drive crank 56 lower trimming reset segment

321 crank body 57 lower shearing line idle stroke section

322 first crank arm 6 drive motor

323 second crank arm 7 adjusting knob

324 lifting presser foot roller 71 adjusting limit plate

33 adaptor 711 limiting hole

331 adaptor body portion 712 stop pin

332 adaptor shaft part 72 rotating shaft

333 lifting presser foot fixing pin 73 knob

334 swing link pin 731 guide shaft part

335 torsional spring 74 regulating wheel

34 lifting presser foot swing rod 741 eccentric shaft part

341 first chute 742 limit bolt

342 retaining ring 743 gear part

35 drive member 744 polygonal portion

36 Lift presser foot actuator assembly 75 spring

361 presser bar 76 scale

362 presser foot lifting swing rod 761 through hole

363 Presser foot lifting Link 8 casing

364 regulating groove 81 motor mounting plate

365 deflector 82 tail

366 first guide groove 83 nose part

367 support 9 axle position screw

368 slider

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.

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

The application provides a buttonholing machine, as shown in fig. 1 and 2, the buttonholing machine comprises a machine shell 8, an upper thread trimming mechanism 1 for trimming upper threads, a lower thread trimming mechanism 2 for trimming bottom threads and a presser foot lifting mechanism 3 for lifting a presser foot; as shown in fig. 3, the upper thread trimming mechanism 1 includes an upper thread trimming driving assembly 11, and an upper thread trimming executing assembly 14 connected to the upper thread trimming driving assembly 11 and driven by the upper thread trimming driving assembly 11 to operate; as shown in fig. 9, the lower thread trimming mechanism 2 includes a lower thread trimming driving assembly 21, and a lower thread trimming executing assembly 24 connected to the lower thread trimming driving assembly 21 and driven by the lower thread trimming driving assembly 21; as shown in fig. 14, the presser foot lifting mechanism 3 includes a presser foot lifting drive assembly 31 and a presser foot lifting actuator assembly 36 connected to the presser foot lifting drive assembly 31 and driven by the presser foot lifting drive assembly 31; the upper trimming drive unit 11, the lower trimming drive unit 21, and the presser foot lifting drive unit 31 are driven by the same drive motor 6. Therefore, in the buttonholing machine related to the application, only one driving motor 6 is used for driving the upper thread trimming mechanism 1, the lower thread trimming mechanism 2 and the presser foot lifting mechanism 3 to act simultaneously, so that the structure and the electric control of the buttonholing machine are greatly simplified and optimized, the manufacturing cost of the buttonholing machine can be greatly reduced, and the buttonholing machine has a good application prospect. Of course, the buttonholing machine may be changed to: the upper trimming drive component 11 and the lower trimming drive component 21 are driven by the same drive motor 6 to act, so that the upper trimming mechanism 1 and the lower trimming mechanism 2 are driven by one drive motor 6 at the same time; or, the upper trimming drive component 11 and the presser foot lifting drive component 31 are driven by the same drive motor 6 to act, so that one drive motor 6 drives the upper trimming mechanism 1 and the presser foot lifting mechanism 3 simultaneously; or, the lower trimming drive component 21 and the presser foot lifting drive component 31 are driven by the same drive motor 6 to act, so that one drive motor 6 drives the lower trimming mechanism 2 and the presser foot lifting mechanism 3 simultaneously; compared with the prior art, the structure can be simplified and the cost can be reduced.

Further, as shown in fig. 2, the buttonholing machine further comprises an upper cam 4 and a lower cam 5, wherein the upper cam 4 and the lower cam 5 are driven by a driving motor 6 to rotate directly or indirectly, the upper trimming drive assembly 11 and the presser foot lifting drive assembly 31 are connected with the upper cam 4, and the driving motor 6 drives the upper cam 4 to rotate so as to drive the upper trimming drive assembly 11 and the presser foot lifting drive assembly 31 to act; the lower trimming line driving component 21 is connected with the lower cam 5, and the lower cam 5 is driven to rotate by the driving motor 6, so that the lower trimming line driving component 21 is driven to act. Preferably, the driving motor 6 is vertically installed and has a vertically extending motor output shaft, the upper end and the lower end of the motor output shaft of the driving motor 6 respectively extend upwards and downwards from the motor housing of the driving motor 6, the upper cam 4 is fixed at the lower end of the motor output shaft, and the lower cam 5 is fixed at the lower end of the motor output shaft. Therefore, the driving motor 6 directly drives the upper cam 4 and the lower cam 5 to rotate; in addition, because the driving motor 6 is vertically installed, the driving motor can be arranged in the machine shell 8, so that the structure of the buttonholing machine is more compact, and the manufacturing cost of the buttonholing machine is further reduced.

As shown in fig. 1 and 2, the left end of the casing 8 is a tail portion 82, the right end of the casing 8 is a nose portion 83, a motor mounting plate 81 fixed to the casing 8 is disposed in the tail portion 82 of the casing 8, and the driving motor 6 is fixed to the lower end surface of the motor mounting plate 81, so that the driving motor 6 is disposed in the tail portion 82 of the casing 8. The upper cam 4 is rotatably located on the upper side of the motor mounting plate 81, an output shaft of the driving motor 6 upwards penetrates through the motor mounting plate 81 and then is fixed with the upper cam 4, and the lower cam 5 is rotatably located on the lower side of the motor mounting plate 81.

The upper thread trimming mechanism 1 has the following specific structure:

the structure of the upper trimming actuator 14 in the upper trimming mechanism 1 belongs to the prior art, and the specific structure can be referred to a model JK-1790 of a buttonholing machine manufactured by jack sewing machine gmbh. Generally, as shown in fig. 3, the upper thread trimming executing assembly 14 includes a first rocker 141, a second rocker 142 and an upper scissors assembly 143 for trimming upper threads, an upper end of the first rocker 141 and an upper end of the second rocker 142 are both hinged to the housing 8 of the buttonholing machine, a middle-lower section of the first rocker 141 and a middle-lower section of the second rocker 142 are both connected to the upper thread trimming driving assembly 11, so that the first rocker 141 and the second rocker 142 are both driven by the upper thread trimming driving assembly 11 to swing, thereby driving the upper scissors assembly 143 to move, and the movement of the upper scissors assembly 143 includes opening and closing, and walking in front and back and left and right directions. The upper thread trimming actuating assembly 14 is located outside the buttonholing machine housing 8, below the housing 8, and above the sewing table.

As shown in fig. 3 to 7, the upper trimming driving assembly 11 is installed in the tail portion 82 of the housing 8, and the upper trimming driving assembly 11 includes a first upper trimming cam sliding slot 41 and a second upper trimming cam sliding slot 42 which are opened on the upper cam 4, a first upper trimming driving lever group 12, and a second upper trimming driving lever group 13. The first upper trimming cam sliding groove 41 and the second upper trimming cam sliding groove 42 are both in a closed curve shape and used for outputting an upper trimming motion track, and each of the first upper trimming cam sliding groove 41 and the second upper trimming cam sliding groove 42 comprises an upper trimming cutting section 43, an upper trimming to-be-cut section 44, an upper trimming cutting section 45 and an upper trimming resetting section 46 which are sequentially connected end to end. The first upper trimming driving rod group 12 is provided with a rotatable first upper trimming roller 121, the first upper trimming roller 121 is embedded into the first upper trimming cam sliding groove 41 of the upper cam 4 and is matched with the first upper trimming cam sliding groove 41 to transmit an upper trimming motion track output by the upper cam 4 to the first upper trimming driving rod group 12, and the tail end of the first upper trimming driving rod group 12 is hinged to the first rocker 141 to control the opening and closing of the upper cutter assembly 143. The second upper trimming driving lever group 13 is provided with a rotatable second upper trimming roller 131, the second upper trimming roller 131 is embedded in the second upper trimming cam sliding groove 42 of the upper cam 4 and is matched with the second upper trimming cam sliding groove 42 to transmit the upper trimming motion trail output by the upper cam 4 to the second upper trimming driving lever group 13, and the tail end of the second upper trimming driving lever group 13 is hinged to the second rocker 142 to control the moving position of the upper trimmer assembly 143.

In the operation process of the upper thread trimming mechanism 1 with the above structure, the driving motor 6 drives the upper cam 4 to rotate, the upper cam 4 drives the first upper thread trimming cam chute 41 to rotate relative to the first upper thread trimming roller 121 and drives the second upper thread trimming cam chute 42 to rotate relative to the second upper thread trimming roller 131, that is: the first upper trimming roller 121 moves relatively along the extending track of the first upper trimming cam chute 41, the second upper trimming roller 131 moves relatively along the extending track of the second upper trimming cam chute 42, and due to the change of the track radius of the first upper trimming cam chute 41 and the second upper trimming cam chute 42, the first upper trimming roller 121 drives the first upper trimming driving rod group 12 to move, and the second upper trimming roller 131 drives the second upper trimming driving rod group 13 to move, so as to drive the upper trimming assembly 143 in the upper trimming executing assembly 14 to move together, so that the upper trimming assembly 143 sequentially executes the opening action, the action to be trimmed, the trimming action and the resetting action. Preferably, the first upper trimming cam sliding groove 41 and the second upper trimming cam sliding groove 42 are respectively arranged on the upper end surface and the lower end surface of the upper cam 4; of course, the positions of the two can be interchanged.

Specifically, when the buttonholing machine starts sewing, the first upper thread trimming roller 121 and the second upper thread trimming roller 131 are both located at the head end of the upper thread trimming cut section 43, the upper scissors assembly 143 is closed and clamps the upper thread, the upper scissors assembly 143 is located at the initial position, the first upper thread trimming roller 121 is located at the head end of the upper thread trimming cut section 43 in the first upper thread trimming cam sliding groove 41, and the second upper thread trimming roller 131 is located at the head end of the upper thread trimming cut section 43 in the second upper thread trimming cam sliding groove 42. After the start of sewing, the first upper thread cutting roller 121 of the first upper thread cutting driving lever group 12 moves relatively in the upper thread cutting section 43 of the first upper thread cutting cam sliding groove 41, and the second upper thread cutting roller 131 of the second upper thread cutting driving lever group 13 moves relatively in the upper thread cutting section 43 of the second upper thread cutting cam sliding groove 42, so that the upper scissors assembly 143 opens, releases the upper thread, and drives the upper scissors assembly 143 to move to the position to be cut. Then, the first upper trimming roller 121 in the first upper trimming driving lever group 12 moves relatively in the upper trimming to-be-trimmed section 44 in the first upper trimming cam slide groove 41, and the second upper trimming roller 131 in the second upper trimming driving lever group 13 moves relatively in the upper trimming to-be-trimmed section 44 in the second upper trimming cam slide groove 42, so as to drive the upper trimmer assembly 143 to move to the trimming position. Then, the first upper thread cutting roller 121 of the first upper thread cutting driving lever group 12 moves relatively in the upper thread cutting section 45 of the first upper thread cutting cam sliding groove 41, and the second upper thread cutting roller 131 of the second upper thread cutting driving lever group 13 moves relatively in the upper thread cutting section 45 of the second upper thread cutting cam sliding groove 42, so that the upper scissors assembly 143 is driven to close, the upper thread is cut, and the cut upper thread is held. Finally, the first upper thread trimming roller 121 of the first upper thread trimming driving lever set 12 moves relatively in the upper thread trimming reset segment 46 of the first upper thread trimming cam slide groove 41, the second upper thread trimming roller 131 of the second upper thread trimming driving lever set 13 moves relatively in the upper thread trimming reset segment 46 of the second upper thread trimming cam slide groove 42, the upper scissors assembly 143 is driven to clamp the upper thread and move back to its initial position, a thread trimming cycle of an upper thread trimming operation is completed, and a next thread trimming cycle is ready to start. The action sequence of the upper scissors assembly 143 is: origin → open → pending cut → cutting line → origin point.

As shown in fig. 4, the first upper trimming driving lever group 12 includes a first upper trimming driving crank 122 and a first upper trimming connecting rod 123 extending in a bending manner, a front end of the first upper trimming driving crank 122 is hinged to the motor mounting plate 81, so that the first upper trimming driving crank 122 has a first fixed swing fulcrum O1, a rear end of the first upper trimming driving crank 122 is hinged to a left end of the first upper trimming connecting rod 123, a right end of the first upper trimming connecting rod 123 is hinged to the first rocking bar 141, and the first upper trimming roller 121 is rotatably mounted on a lower end face of the first upper trimming driving crank 122 through a pin extending vertically. The first upper trimming driving lever group 12 is close to a spatial four-bar mechanism, and when the first upper trimming roller 121 moves relative to the first upper trimming cam runner 41 of the upper cam 4, the first upper trimming driving crank 122 swings around the first fixed swing fulcrum O1 to a certain extent, so as to drive the first upper trimming connecting rod 123 and the first rocker 141 to swing, and further drive the upper scissors assembly 143 to perform related actions. Preferably, the first upper trimming driving crank 122 is hinged to the motor mounting plate 81, the first upper trimming driving crank 122 is hinged to the first upper trimming connecting rod 123 through an up-down extending axial screw 9, and the first upper trimming connecting rod 123 is hinged to the first rocker 141 through a front-back extending axial screw 9.

As shown in fig. 5, the second upper trimming driving lever group 13 includes a second upper trimming driving crank 132 and a second upper trimming connecting rod 133 extending in a bending manner, a front end of the second upper trimming driving crank 132 is hinged to the motor mounting plate 81, so that the second upper trimming driving crank 132 has a second fixed swing fulcrum O2, a rear end of the second upper trimming driving crank 132 is hinged to a left end of the second upper trimming connecting rod 133, a right end of the second upper trimming connecting rod 133 is hinged to the second rocking rod 142, and the second upper trimming roller 131 is rotatably mounted on an upper end surface of the second upper trimming driving crank 132 through a pin extending vertically. The second upper trimming driving lever group 13 is also close to a spatial four-bar mechanism, and when the second upper trimming roller 131 moves relative to the second upper trimming cam runner 42 of the upper cam 4, the second upper trimming driving crank 132 swings around the second fixed swing fulcrum O2 to drive the second upper trimming connecting rod 133 and the second rocker 142 to swing, so as to drive the upper scissor assembly 143 to perform a related action. Preferably, the second upper trimming driving crank 132 is hinged to the motor mounting plate 81, the second upper trimming driving crank 132 is hinged to the second upper trimming connecting rod 133 through an up-down extending axial screw 9, and the second upper trimming connecting rod 133 is hinged to the second rocker 142 through a back-and-forth extending axial screw 9.

Since the upper trimming mechanism 1 and the presser foot lifting mechanism 3 share one driving motor 6, as shown in fig. 6 and 7, the first upper trimming cam chute 41 and the second upper trimming cam chute 42 both further include an upper trimming idle stroke section 47, the upper trimming idle stroke section 47 is located between the upper trimming return section 46 and the upper trimming cutting section 43, and the radius of the upper trimming idle stroke section 47 is not changed. Therefore, when the first upper trimming roller 121 of the first upper trimming driving lever group 12 moves relatively in the upper trimming idle stroke section 47 of the first upper trimming cam slide groove 41 and the second upper trimming roller 131 of the second upper trimming driving lever group 13 moves relatively in the upper trimming idle stroke section 47 of the second upper trimming cam slide groove 42, neither the first upper trimming driving lever group 12 nor the second upper trimming driving lever group 13 operates, so that the upper trimming mechanism 1 does not operate as a whole, but the presser foot lifting mechanism 3 performs the presser foot lifting operation, and the upper trimming idle stroke section 47 is the presser foot lifting stroke section of the presser foot lifting mechanism 3.

As shown in fig. 8, the change rule of the radius of the first upper trimming cam chute 41 is as follows: the radius of the upper trimming cutting section 43 is gradually reduced and then gradually increased, the radius of the upper trimming to-be-trimmed section 44 is gradually reduced and then gradually increased, the radius of the upper trimming cutting section 45 is gradually reduced, and the tail end of the upper trimming cutting section has the minimum radius of the first upper trimming cam chute 41, so that the inclination of the upper trimming cutting section 45 is larger, the radius of the upper trimming resetting section 46 is unchanged and then gradually increased, and the radius of the upper trimming idle stroke section 47 is unchanged. The change rule of the radius of the second upper trimming cam chute 42 is as follows: the radius of the upper trimming cutting section 43 is firstly unchanged and then gradually reduced, the radius of the upper trimming to-be-trimmed section 44 is firstly gradually increased and then unchanged, the radius of the upper trimming cutting section 45 is gradually increased, and the tail end of the upper trimming cutting section has the maximum radius of the second upper trimming cam chute 42, so that the inclination of the upper trimming cutting section 45 is larger, the radius of the upper trimming resetting section 46 is gradually reduced, and the radius of the upper trimming idle stroke section 47 is unchanged.

The lower thread trimming mechanism 2 has the following specific structure:

the lower thread trimming executing assembly 24 is arranged inside the buttonholing machine and is positioned below the sewing table; the structure of the lower trimming executing unit 24 is known in the art, and the specific structure can be found in a model JK-1790 of a buttonholing machine manufactured by jack sewing machine gmbh. In general, as shown in fig. 9, the lower thread cutting execution assembly 24 in the buttonholing machine includes a first scissors control plate 241, a second scissors control plate 242, and a lower scissors assembly for cutting the bobbin thread, and the first scissors control plate 241 and the second scissors control plate 242 are both driven by the lower thread cutting driving assembly 21 to drive the lower scissors assembly to move, and the movement of the lower scissors assembly includes opening and closing, and walking of front and rear and left and right.

The lower trimming drive assembly 21 is mounted at the lower end of the tail part 82 of the machine shell 8; as shown in fig. 9 to 12, the lower trimming driving assembly 21 includes a first lower trimming cam sliding slot 51 and a second lower trimming cam sliding slot 52 formed on the lower cam 5, a first lower trimming driving lever group 22, and a second lower trimming driving lever group 23; the first lower trimming cam sliding groove 51 and the second lower trimming cam sliding groove 52 are both in a closed curve shape and used for outputting a lower trimming motion track, and the first lower trimming cam sliding groove 51 and the second lower trimming cam sliding groove 52 both comprise a lower trimming cutting section 53, a lower trimming to-be-cut section 54, a lower trimming cutting section 55 and a lower trimming resetting section 56 which are sequentially connected end to end. The first lower trimming driving rod group 22 is provided with a rotatable first lower trimming roller 221, the first lower trimming roller 221 is embedded in the first lower trimming cam sliding groove 51 of the lower cam 5 and is matched with the first lower trimming cam sliding groove 51 for transmitting a lower trimming motion track output by the lower cam 5 to the first lower trimming driving rod group 22, and the tail end of the first lower trimming driving rod group 22 is hinged to the first scissor control plate 241 and is used for controlling the opening and closing of the lower scissor assembly. The second lower trimming driving rod group 23 is provided with a rotatable second lower trimming roller 231, the second lower trimming roller 231 is embedded into the second lower trimming cam sliding groove 52 of the lower cam 5 and is matched with the second lower trimming cam sliding groove 52 for transmitting the lower trimming motion trail output by the lower cam 5 to the second lower trimming driving rod group 23, and the tail end of the second lower trimming driving rod group 23 is hinged to the second scissors control plate 242 for controlling the lower scissors assembly to move.

In the operation process of the lower trimming mechanism 2 with the above structure, the driving motor 6 drives the lower cam 5 to rotate, the lower cam 5 drives the first lower trimming cam sliding groove 51 to rotate relative to the first lower trimming roller 221, and drives the second lower trimming cam sliding groove 52 to rotate relative to the second lower trimming roller 231, that is: the first lower trimming roller 221 moves relatively along the extending track of the first lower trimming cam sliding groove 51, the second lower trimming roller 231 moves relatively along the extending track of the second lower trimming cam sliding groove 52, and due to the change of the track radius of the first lower trimming cam sliding groove 51 and the second lower trimming cam sliding groove 52, the first lower trimming roller 221 drives the first lower trimming driving rod group 22 to move, and the second lower trimming roller 231 drives the second lower trimming driving rod group 23 to move, so as to drive the lower scissor assemblies in the lower trimming actuating assembly 24 to move together, and the lower scissor assemblies sequentially execute a cutting action, a waiting cutting action, a trimming action and a resetting action.

Specifically, when the buttonholing machine starts sewing, the first lower thread trimming roller 221 and the second lower thread trimming roller 231 are both located at the head end of the lower thread trimming cut section 53, the lower scissors assembly is closed and clamps the bottom thread, the lower scissors assembly is located at the initial position, the first lower thread trimming roller 221 is located at the head end of the lower thread trimming cut section 53 in the first lower thread trimming cam sliding groove 51, and the second lower thread trimming roller 231 is located at the head end of the lower thread trimming cut section 53 in the second lower thread trimming cam sliding groove 52. After the start of sewing, the first lower thread cutting roller 221 in the first lower thread cutting driving lever group 22 relatively moves in the lower thread cutting section 53 in the first lower thread cutting cam sliding groove 51, and the second lower thread cutting roller 231 in the second lower thread cutting driving lever group 23 relatively moves in the lower thread cutting section 53 in the second lower thread cutting cam sliding groove 52, so that the lower scissors assembly opens, releases the upper thread, and drives the lower scissors assembly to move to the position to be cut. Then, the first lower trimming roller 221 of the first lower trimming driving lever group 22 moves relatively in the lower trimming ready segment 54 of the first lower trimming cam slide groove 51, and the second lower trimming roller 231 of the second lower trimming driving lever group 23 moves relatively in the lower trimming ready segment 54 of the second lower trimming cam slide groove 52, so as to drive the lower trimming assembly to move to the trimming position. Then, the first lower trimming roller 221 of the first lower trimming driving lever group 22 moves relatively in the lower trimming line segment 55 of the first lower trimming cam slide groove 51, and the second lower trimming roller 231 of the second lower trimming driving lever group 23 moves relatively in the lower trimming line segment 55 of the second lower trimming cam slide groove 52, so that the lower trimmer assembly is driven to close, the bobbin thread is trimmed, and the trimmed bobbin thread is clamped. Finally, the first lower trimming roller 221 of the first lower trimming driving lever group 22 moves relatively in the lower trimming return section 56 of the first lower trimming cam slide groove 51, the second lower trimming roller 231 of the second lower trimming driving lever group 23 moves relatively in the lower trimming return section 56 of the second lower trimming cam slide groove 52, the lower scissor assembly is driven to clamp the bottom wire and move back to the initial position, the trimming cycle of one lower trimming action is completed, and the next trimming cycle is ready to start. The action time sequence of the lower scissors assembly is as follows: origin → open → pending cut → cutting line → origin point.

In this embodiment, as shown in fig. 12, the first lower trimming cam sliding groove 51 and the second lower trimming cam sliding groove 52 are both formed on the lower end surface of the lower cam 5, and the first lower trimming cam sliding groove 51 is located on the inner ring side of the second lower trimming cam sliding groove 52 and is concentrically disposed with the second lower trimming cam sliding groove; of course, in other embodiments, the first lower trimming cam sliding groove 51 may be located at the outer ring side of the second lower trimming cam sliding groove 52, and both may be arranged concentrically.

As shown in fig. 9 to 11, the first lower trimming drive lever group 22 includes a first lower trimming drive crank 222, a first crank link 223 and a second crank link 224, the rear end of the first lower trimming drive crank 222 is hinged to the housing 8, so that the rear end of the first lower trimming drive crank 222 has a third fixed swing fulcrum O3, the front end of the first lower trimming drive crank 222 is hinged to the left end of the first crank link 223, the right end of the first crank link 223 is fixed to the left end of the second crank link 224 by a screw, the right end of the second crank link 224 is hinged to the left end of the first scissor control plate 241, and the first lower trimming roller 221 is rotatably mounted on the upper end surface of the first lower trimming drive crank 222 by a pin extending up and down. The first lower trimming driving lever group 22 is a large-span four-bar mechanism, and when the first lower trimming roller 221 moves relative to the first lower trimming cam sliding groove 51 of the lower cam 5, the first lower trimming driving crank 222 swings around the third fixed swing fulcrum O3 to a certain extent, so that the first crank connecting rod 223 and the second crank connecting rod 224 drive the first scissor control plate 241 to move, and further the lower trimming executing assembly 24 drives the lower scissor assembly to execute related actions. Preferably, the first lower trimming line driving crank 222 and the housing 8, the first lower trimming line driving crank 222 and the first crank connecting rod 223, and the first crank connecting rod 223 and the first scissor control plate 241 are hinged by a shaft screw 9 extending up and down.

As shown in fig. 9 to 11, the second lower cutting drive link group 23 includes a second lower cutting drive crank 232, a third crank link 233, and a lower cutting link 234, the rear end of the second lower trimming driving crank 232 is hinged to the housing 8, so that the rear end of the second lower trimming driving crank 232 has a fourth fixed swing fulcrum O4, the front end of the second lower trimming driving crank 232 is hinged with the left end of the third crank connecting rod 233, the right end of the third crank connecting rod 233 is hinged with the left end of the lower trimming connecting rod 234, the right end of the lower trimming connecting rod 234 is hinged with the second scissor control plate 242, the left section of the lower trimming link 234 is hinged to the housing 8 by a pin extending up and down, so that the lower trimming link 234 has a fifth fixed swing fulcrum O5, the second lower trimming roller 231 is rotatably mounted on a second lower trimming driving crank 232 through a pin extending up and down. The first lower trimming driving lever group 22 is a four-bar mechanism, and when the second lower trimming roller 231 moves relative to the second lower trimming cam runner 52 of the lower cam 5, the second lower trimming driving crank 232 swings around the fourth fixed swing fulcrum O4 to drive the second scissors control board 242 to move through the third crank connecting rod 233 and the lower trimming connecting rod 234, so as to drive the lower scissors assembly to execute the related movement through the lower trimming executing assembly 24. Preferably, the second lower trimming driving crank 232 is hinged to the housing 8, the second lower trimming driving crank 232 is hinged to the third crank connecting rod 233, the third crank connecting rod 233 is hinged to the lower trimming connecting rod 234, and the lower trimming connecting rod 234 is hinged to the second scissors control plate 242 by an up-down extending shaft bolt 9.

In addition, the positional relationship of the respective constituent members of the first lower scissors drive lever group 22 and the second lower scissors drive lever group 23 is as follows: as shown in fig. 9 to 11, the first lower trimming drive crank 222 is located on the left side of the second lower trimming drive crank 232, the first crank link 223 is located on the front side of the third crank link 233, the second crank link 224 is located on the front side of the lower trimming link 234, and the first scissor control plate 241 is located on the right side of the second scissor control plate 242.

Preferably, since the lower trimming mechanism 2 and the presser foot lifting mechanism 3 share the same driving motor 6, as shown in fig. 12, the first lower trimming cam slide groove 51 and the second lower trimming cam slide groove 52 each further include a lower trimming idle stroke section 57, the lower trimming idle stroke section 57 is located between the lower trimming return section 56 and the lower trimming cutting section 53, and the radius of the lower trimming idle stroke section 57 is not changed. Therefore, when the first lower trimming roller 221 of the first lower trimming driving lever group 22 moves relatively in the lower trimming idle stroke section 57 of the first lower trimming cam slide groove 51 and the second lower trimming roller 231 of the second lower trimming driving lever group 23 moves relatively in the lower trimming idle stroke section 57 of the second lower trimming cam slide groove 52, neither the first lower trimming driving lever group 22 nor the second lower trimming driving lever group 23 operates, and therefore the lower trimming driving unit 21 does not operate, and the lower scissors unit does not operate, but the presser foot lifting mechanism 3 of the buttonholing machine operates, and therefore the lower trimming idle stroke section 57 is the presser foot lifting stroke section of the buttonholing machine.

Further, as shown in fig. 3, the change rule of the radius of the first lower trimming cam runner 51 is as follows: the radius of the lower trimming cutting section 53 is unchanged and then gradually reduced, and the tail end of the lower trimming cutting section is provided with the minimum radius of the first lower trimming cam sliding groove 51, the radius of the lower trimming to-be-trimmed section 54 is gradually increased and then is unchanged, the radius of the lower trimming cutting section 55 is unchanged, the radius of the lower trimming resetting section 56 is unchanged, and the radius of the lower trimming idle stroke section 57 is unchanged. The change rule of the radius of the second lower trimming cam chute 52 is as follows: the radius of the lower trimming line cutting section 53 is not changed, the radius of the lower trimming line section to be cut 54 is not changed, the radius of the lower trimming line cutting line section 55 is gradually increased, the tail end of the lower trimming line section has the maximum radius of the second lower trimming line cam chute 52, the radius of the lower trimming line resetting section 56 is gradually reduced and then is not changed, and the radius of the lower trimming line idle stroke section 57 is not changed.

The specific structure of the presser foot lifting mechanism 3 is as follows:

as shown in fig. 14 to 17, the presser foot lifting actuating assembly 36 is mounted in the head portion 83 of the housing 8, and has a presser foot bar 361 extending vertically, and a presser foot is fixed to the presser foot bar 361 and extending downward from the housing 8 at a lower end of the presser foot bar 361. The presser foot lifting driving component 31 is arranged in the tail part 82 of the machine shell 8 and comprises a presser foot lifting cam chute 48 arranged on the outer peripheral surface of the upper cam 4, a presser foot lifting driving crank 32 with a sixth fixed swing fulcrum O6, a presser foot lifting roller 324 rotatably connected at the front end of the presser foot lifting driving crank 32, a presser foot lifting swing rod 34 with the lower end connected with the rear end of the presser foot lifting driving crank 32 and a seventh fixed swing fulcrum O7, and a transmission piece 35 extending left and right along the length direction of the machine shell 8; the presser foot lifting cam chute 48 is in a closed curve shape and is used for outputting a motion track of the presser foot lifting; the presser foot lifting roller 324 is embedded in the presser foot lifting cam chute 48 of the upper cam 4, is matched with the presser foot lifting cam chute 48, and is used for transmitting the presser foot lifting motion track output by the upper cam 4 to the presser foot lifting driving crank 32 so as to drive the lower end of the presser foot lifting swing rod 34 to swing; the left end of the transmission piece 35 is hinged with the upper end of the presser foot lifting swing rod 34, so that the swinging of the presser foot lifting swing rod 34 can drive the transmission piece 35 to act; the right end of the transmission member 35 is connected to the presser foot lifting actuating assembly 36 to drive the presser foot lever 361 to move up or down, thereby realizing the upward presser foot lifting or downward presser foot placing.

Preferably, the transmission member 35 may be a link or a wire rope, and in the presser foot lifting mechanism 3 shown in fig. 14 and 15, the transmission member 35 is a transmission link. The presser foot lifting and swinging rod 34 extends vertically, and the presser foot lifting and swinging rod 34 is rotatably connected to the casing 8 through a fixing pin extending back and forth, or the presser foot lifting and swinging rod 34 is rotatably connected to a fixing plate through a fixing pin extending back and forth, and the fixing plate is fixed to the casing 8, so the fixing pin is a seventh fixed swinging fulcrum O7 of the presser foot lifting and swinging rod 34.

Preferably, as shown in fig. 16 and 17, the rear end of the presser foot lifting driving crank 32 is connected to the presser foot lifting swing rod 34 through an adapter 33, the adapter 33 includes an adapter body 331 and an adapter shaft 332 extending vertically downward from the lower end of the adapter body 331, a presser foot lifting fixing pin 333 extending forward and backward in the width direction of the chassis 8 is fixed in one end of the presser foot lifting swing rod 34, the adapter shaft 332 is rotatably and axially movably inserted in the other end of the presser foot lifting driving crank 32 in the up-down direction, and the presser foot lifting fixing pin 333 is rotatably and axially movably inserted in the adapter body 331 in the forward-down direction. The presser foot lifting drive crank 32 includes a crank body 321, a first crank arm 322 extending substantially forward from the outer periphery of the crank body 321, and a second crank arm 323 extending substantially rearward from the outer periphery of the crank body 321, the crank body 321 of the presser foot lifting drive crank 32 is rotatably connected to the motor mounting plate 81 by a vertically extending rocker pin 334, so that the rocker pin 334 forms a sixth fixed swing fulcrum O6 of the presser foot lifting drive crank 32, the presser foot lifting roller 324 is rotatably connected to the front end of the first crank arm 322 of the presser foot lifting drive crank 32 by a vertically extending screw, and the adaptor shaft 332 of the adaptor 33 is rotatably and vertically axially movably inserted through the rear end of the second crank arm 323 of the presser foot lifting drive crank 32. The lower end of the presser foot lifting driving crank 32 is provided with a torsion spring 335, two ends of the torsion spring 335 are respectively connected to the second crank arm part 323 and the motor mounting plate 81, and the torsion spring 335 is used for applying an acting force to the presser foot lifting driving crank 32, so that the front end of the presser foot lifting driving crank 32 is close to the presser foot lifting cam sliding groove 48 of the upper cam 4, and the presser foot lifting roller 324 at the front end of the presser foot lifting driving crank 32 is always tightly attached to the groove peripheral surface of the presser foot lifting cam sliding groove 48, thereby ensuring the accuracy and reliability of force transmission.

Further, as shown in fig. 16 and 18, the presser foot lifting actuating assembly 36 includes a presser foot lifting swing lever 362 having an eighth fixed swing fulcrum O8, a presser foot lifting link 363, a guide plate 365 fixed to the housing 8, and a bracket 367, wherein a first guide groove 366 extending vertically is formed in the guide plate 365, a slider 368 protruding forward is provided on a front end surface of the bracket 367, and the presser foot lever 361 is fixed in the bracket 367; the presser foot lifting and lowering swing lever 362 is substantially L-shaped, the right end of the transmission member 35 is hinged to the upper end of the left side of the presser foot lifting and lowering swing lever 362, the lower end of the right side of the presser foot lifting and lowering swing lever 362 is hinged to the upper end of the presser foot lifting and lowering link 363, the lower end of the presser foot lifting and lowering link 363 is hinged to the slider 368, the slider 368 is located in the first guide groove 366 of the guide plate 365 and can slide up and down in the first guide groove 366, that is, the presser foot lifting and lowering swing lever 362, the presser foot lifting and lowering link 363, the bracket 367 with the slider 368, and the guide plate 365 with the first guide groove 366 constitute a crank slider mechanism. The transmission member 35 is hinged to the presser foot vertically-moving link 362, and the presser foot vertically-moving link 363 by shaft screws 9 extending in the front-rear direction.

Preferably, as shown in fig. 16 and 18, an adjusting groove 364 extending up and down is formed in the presser foot lifting link 363, and a shaft position screw 9 for hinging the presser foot lifting swing rod 362 and the presser foot lifting link 363 is inserted into the adjusting groove 364; the presser bar 361 is sleeved with a pressure spring, not shown in the figure, and the upper end and the lower end of the pressure spring are respectively abutted against the casing 8 and the bracket 367. In the process of lifting and releasing the presser foot, the presser foot is not contacted with the cloth, so the pressure of the pressure spring is all acted on the bracket 367, thereby the shaft position screw 9 penetrating in the adjusting groove 364 is always abutted against the upper edge of the adjusting groove 364, and the presser foot lifting action and the presser foot releasing action are accurately executed. When the presser foot is put down, the presser foot is contacted with the cloth, the pressure of the pressure spring is born by the cloth and the needle plate, and therefore, the shaft position screw 9 penetrating in the adjusting groove 364 and the upper edge of the adjusting groove 364 can be loosened. Since the adjustment groove 364 is a long groove extending vertically, it enables the presser foot lifting mechanism to be suitable for different thicknesses of cloth, and is also convenient for adjusting the upward or downward stroke of the presser foot bar 361.

Further, as shown in fig. 14 to 16, the presser foot lifting mechanism 3 further includes a presser foot lifting height adjusting assembly 37 acting on a hinge point of the presser foot lifting swing rod 34 and the transmission member 35, the presser foot lifting height adjusting assembly 37 is used for adjusting a height position of the hinge point of the presser foot lifting swing rod 34 and the transmission member 35, so as to adjust a length between the hinge point of the presser foot lifting swing rod 34 and the transmission member 35 and a seventh fixed swing fulcrum O7 of the presser foot lifting swing rod 34, further adjust a swing amplitude of the transmission member 35 driven by the presser foot lifting swing rod 34, and finally adjust a stroke of the presser foot rod 361 in the presser foot lifting execution assembly 36 driven by the transmission member 35 to move up or down, so as to realize presser foot lifting height adjustment, so that the presser foot lifting mechanism can be suitable for cloth with different thicknesses, and further ensure that the buttonholing sewing machine can normally.

Specifically, after the adjustment of the height of the presser foot is finished, the lower end of the presser foot lifting swing rod 34 is driven to swing by the presser foot lifting driving assembly 31 in the operation process of the buttonholing machine, so that the upper end of the presser foot lifting swing rod 34 also swings. When the hinged point of the presser foot lifting and swinging rod 34 and the transmission piece 35 is located at the high position through the presser foot lifting height adjusting assembly 37, the length between the hinged point of the presser foot lifting and swinging rod 34 and the transmission piece 35 and the seventh fixed swinging fulcrum O7 of the presser foot lifting and swinging rod 34 is longer, so that the swinging amplitude of the upper end of the presser foot lifting and swinging rod 34 is larger, the stroke of the presser foot lifting and swinging rod 34 for driving the presser foot lifting and executing assembly 36 to move up and down through the transmission piece 35 is increased, and the presser foot lifting and swinging assembly is suitable for thin materials. When the hinged point of the presser foot lifting and swinging rod 34 and the transmission piece 35 is located at the low position through the presser foot lifting height adjusting assembly 37, the length between the hinged point of the presser foot lifting and swinging rod 34 and the transmission piece 35 and the seventh fixed swinging fulcrum O7 of the presser foot lifting and swinging rod 34 is shorter, so that the swinging amplitude of the upper end of the presser foot lifting and swinging rod 34 is smaller, and the stroke of the presser foot lifting and swinging rod 34 for driving the presser foot lifting and executing assembly 36 to move up or down through the transmission piece 35 is reduced, so that the presser foot lifting and swinging rod is suitable for.

Further, as shown in fig. 14 to 16, the presser foot height adjustment assembly 37 includes a rail plate 38 movable up and down, an operation member for driving the rail plate 38 to move up and down, and a connecting pin 311 extending forward and backward; the rail plate 38 has a first rail plate arm portion 381 and a second rail plate arm portion 382 which are arranged in parallel, and the first rail plate arm portion 381 and the second rail plate arm portion 382 both extend right and left in the longitudinal direction of the housing 8, so that the first rail plate arm portion 381 and the second rail plate arm portion 382 are arranged to face each other in the front-rear direction; the operating member is connected with the first guide rail plate arm 381, and drives the first guide rail plate arm 381 to move up and down; the second guide rail plate arm 382, the left end of the transmission member 35 and the upper end of the pressure lifting and pressing foot swing rod 34 are hinged through the connecting pin 311, so that the connecting pin 311 is a hinge point of the pressure lifting and pressing foot swing rod 34 and the transmission member 35, a first sliding groove 341 extending up and down along the length direction of the pressure lifting and pressing foot swing rod 34 is arranged in the pressure lifting and pressing foot swing rod 34, a second sliding groove 384 extending left and right along the length direction of the second guide rail plate arm 382 is arranged in the second guide rail plate arm 382, and the connecting pin 311 is inserted into the first sliding groove 341 and the second sliding groove 384; a stopper 342 located on the front side of the second rail plate arm portion 382 is fixed to the front end of the connecting pin 311. When the operating member moves the first rail plate arm 381 up and down, the rail plate 38 moves up and down as a whole, so that the second rail plate arm 382 of the rail plate 38 also moves up and down in synchronization, and the hinge points of the presser foot swing lever 34, the transmission member 35, and the second rail plate arm 382 are also driven to move up and down in synchronization, that is, the positions of the connecting pin 311 in the first runner 341 and the second runner 384, that is, the distance between the connecting pin 311 and the seventh fixed swing fulcrum O7 of the presser foot swing lever 34, is adjusted.

Preferably, as shown in fig. 14 to 16, the lift foot height adjusting assembly 37 further includes a mounting bracket 39, the mounting bracket 39 includes a mounting bracket fixing portion 391 fixed to the top of the housing 8, and a mounting bracket guide portion 392 provided with a second guide groove 393 extending up and down, the guide rail plate 38 further has a guide rail plate body portion 383 between a first guide rail plate arm portion 381 and a second guide rail plate arm portion 382, so that the guide rail plate body portion 383 extends back and forth in the width direction of the housing 8, the first guide rail plate arm portion 381 is located at the front end of the guide rail plate body portion 383, and the second guide rail plate arm portion 382 is located at the rear end of the guide rail plate body portion 383; the guide bolt 310 is fixed on the guide rail plate body 383, the guide bolt 310 is arranged in the second guide groove 393 of the mounting frame guide part 392 in a penetrating mode, the head of the guide bolt 310 is located outside the second guide groove 393, the guide bolt 310 forms a track of the guide rail plate 38, accuracy and stability of the operation piece driving the guide rail plate 38 to move up and down can be improved through mutual matching of the guide bolt 310 and the second guide groove 393, and then accuracy and precision of the presser foot lifting height adjustment are improved.

Preferably, as shown in fig. 1 and 14, the operating member is an adjusting knob 7 which is rotatably mounted on the front surface of the housing 8 and can be quickly disengaged and disengaged, the adjusting knob 7 includes an eccentric shaft portion 741 that is eccentrically disposed, that is, the eccentric shaft portion 741 is eccentric to the rotation axis of the adjusting knob 7, the first rail plate arm portion 381 is opened with a third slide groove 385 that extends left and right along the length direction of the first rail plate arm portion 381, and the eccentric shaft portion 741 is inserted into the third slide groove 385. When the adjusting knob 7 is rotated, the eccentric shaft portion 741 drives the first guide rail plate arm portion 381 to move up and down, and simultaneously, the eccentric shaft portion 741 further slides left and right in the third sliding groove 385, so that the height of the hinge point of the presser foot lifting swing rod 34 and the transmission member 35 is adjusted, and further the height adjustment of the presser foot is realized.

The specific structure of the adjusting knob 7 capable of being quickly clutched is as follows:

the adjusting knob 7 capable of being quickly clutched comprises an adjusting limit plate 71 fixed on the inner wall of the machine shell 8, a rotating shaft 72 extending forwards and backwards along the width direction of the machine shell 8, a knob 73 fixed at the front end of the rotating shaft 72, an adjusting wheel 74 fixed at the rear end of the rotating shaft 72 and a spring 75 positioned between the knob 73 and the adjusting limit plate 71; the rotating shaft 72 is rotatably arranged in the machine shell 8 and the adjusting limit plate 71 in a penetrating way; the spring 75 extends axially in the front-rear direction and is in a compressed state, so that the spring 75 is a compression spring; the knob 73, the spring 75, the adjusting limit plate 71 and the adjusting wheel 74 are sequentially arranged from front to back, the knob 73 and the spring 75 are positioned outside the machine shell 8, the adjusting limit plate 71 and the adjusting wheel 74 are positioned inside the machine shell 8, and the eccentric shaft portion 741 is arranged on the back end face of the adjusting wheel 74, which faces away from the adjusting limit plate 71; furthermore, a front end surface of the adjusting wheel 74 facing the adjusting limiting plate 71 is provided with a limiting protrusion protruding forwards, and a rear end surface of the adjusting limiting plate 71 is provided with a limiting concave portion facing the adjusting wheel 74 and matched with the limiting protrusion. When the knob 73 is pressed backwards, the knob 73 drives the adjusting wheel 74 to synchronously move backwards through the rotating shaft 72, so that the limit protrusion on the adjusting wheel 74 is separated from the limit concave part on the adjusting limit plate 71, at this time, an operator rotates the knob 73, the knob 73 drives the adjusting wheel 74 to synchronously rotate through the rotating shaft 72, the height position of the eccentric shaft part 741 changes, and the guide rail plate 38 is synchronously driven to move upwards or downwards, so that the height adjustment of the pressure foot is completed. After the height adjustment of the presser foot is finished, the knob 73 is loosened, the spring 75 is in a compressed state, a forward acting force is applied to the knob 73 by the spring 75, the knob 73 moves forwards under the acting force of the spring 75 to reset, the knob 73 drives the adjusting wheel 74 to synchronously move forwards through the rotating shaft 72 to reset, so that the limiting protruding part on the adjusting wheel 74 is matched with the limiting concave part on the adjusting limiting plate 71, the adjusting wheel 74 cannot rotate, the adjusting knob 7 is self-locked, the knob 73 cannot rotate, and the height of the presser foot cannot be adjusted. Therefore, the adjusting knob 7 can quickly realize the clutch between the adjusting wheel 74 and the adjusting limit plate 71 by pressing or loosening the knob 73, and further, when the knob 73 is loosened, the whole adjusting knob 7 is in a self-locking state by matching the limit protruding part on the adjusting wheel 74 with the limit concave part on the adjusting limit plate 71, so that the self-locking is reliable and stable, and the presser foot lifting mechanism 3 can reliably run after the height adjustment of the presser foot is finished; in addition, when the height of the presser foot is adjusted by using the adjusting knob 7, the knob 73 is only required to be pressed and rotated, and the operation is simple and rapid.

Further, as shown in fig. 24 to 26, the electronic device further includes a scale plate 76 fixed on the housing 8 and located outside the housing 8, so that the scale plate 76 is located between the knob 73 and the adjusting limit plate 71, and the scale plate 76 is further provided with a through hole 761 for allowing the spring 75 and the rotating shaft 72 to pass through; the scale used for indicating the height of the presser foot is arranged on the front surface of the scale dial 76, when the knob 73 is pressed backwards and rotated, the pointer on the knob 73 is aligned with a certain scale on the scale dial 76, and then the knob 73 is loosened, the pointer on the knob 73 is aligned with a new scale, and the whole presser foot lifting height adjusting assembly 37 also realizes self-locking, so that the operation of presser foot lifting height adjustment by an operator is facilitated. Preferably, the scale mark disc 76, the casing 8 and the adjusting limit plate 71 are fixed by a plurality of fixing screws extending back and forth; the knob 73 is fixed to the shaft 72, and the shaft 72 is fixed to the adjustment wheel 74 by a plurality of fixing screws extending in a radial direction of the shaft 72.

Preferably, as shown in fig. 25, a guide shaft portion 74 extending rearward is provided on a rear end surface of the knob 73 facing the adjustment limiting plate 71, the spring 75 is sleeved on the rotating shaft 72, a front end of the spring 75 is sleeved on the guide shaft portion 74 of the knob 73, and a rear end of the spring 75 abuts on a front end surface of the housing 8, so that accuracy of returning the knob 73 by moving the spring 75 forward after the knob 73 is released is improved.

In the present application, the limit protrusion of the adjustment wheel 74 and the limit recess of the adjustment limit plate 71 have various forms: as shown in fig. 25 and 26, the limiting protrusion on the adjusting wheel 74 is a limiting bolt 742 extending forward, and the limiting recess on the adjusting limiting plate 71 is a plurality of limiting holes 711; when the knob 73 is loosened, the end of the limit bolt 742 is inserted into one of the limit holes 711 in the plurality of limit holes 711, so that the rotation of the adjusting wheel 74 and the knob 73 is limited; preferably, two stop pins 712 extending backward are disposed on the rear end surface of the adjustment limiting plate 71 facing the adjustment wheel 74, the two stop pins 712 are respectively located at two ends of the limiting concave portion, that is, the plurality of limiting holes 711 are located between the two stop pins 712, and in the process that the knob 73 drives the adjustment wheel 74 to rotate, the stop pins 712 are used for limiting the rotation of the limiting bolt 742 on the adjustment wheel 74, so that the limiting bolt 742 can only rotate within the range of the limiting holes 711, and the rotation range of the knob 73 is also limited. As shown in fig. 27, the second form of the limit protrusion and the limit recess is that the limit protrusion on the adjustment wheel 74 is a gear 743, and the limit recess on the adjustment limit plate 71 is a gear groove adapted to the gear 743; when the knob 73 is released, the gear portion 743 is located in the gear groove, thereby restricting the rotation of the adjustment wheel 74 and the knob 73. As shown in fig. 28 or 29, the limiting protrusion on the adjusting wheel 74 is a polygonal portion 744, and the limiting recess on the adjusting limiting plate 71 is a polygonal groove adapted to the polygonal portion 744; when the knob 73 is released, the polygonal portion 744 is positioned in the polygonal groove, thereby restricting the rotation of the adjustment wheel 74 and the knob 73; preferably, the limit protrusion on the adjustment wheel 74 is a regular polygon 744, and the limit recess on the adjustment limit plate 71 is a regular polygon groove matching with the regular polygon 744. Of course, the limit protrusion and the limit recess may also adopt other forms such as a spline.

The working principle of the presser foot lifting mechanism 3 is as follows:

fig. 19 is a schematic diagram of the presser foot lifting mechanism 3 in the present application, which is compared with the structure diagram of the presser foot lifting mechanism 3 shown in fig. 14 to 16, wherein the presser foot lifting driving crank 32 is K-J-I, the adaptor 33 is I-H, the presser foot lifting swing rod 34 is H-G-F, the connecting pin 311 is F, the second sliding groove 384 on the second guide rail plate arm 382 is F-M, the mounting bracket 39 is P-Q, the adjusting knob 7 is O-N, the knob 73 in the adjusting knob 7 is O, the eccentric shaft 741 in the adjusting knob 7 is N, the transmission member 35 is F-E, the presser foot lifting swing plate is E-a-B, the presser foot lifting link 363 is B-C, the presser foot lever 361 is C-D, and J is the sixth fixed swing fulcrum O6O of the presser foot lifting driving crank 32, g is the seventh fixed pivot point O7O of the presser foot lifting and swinging lever 34, and a is the eighth fixed pivot point O8O of the presser foot lifting and swinging lever 362. As can be seen from fig. 19: when the presser foot lifting swing rod 34(H-G-F) is driven by the presser foot lifting driving crank 32(K-J-I) and the adaptor 33(I-H) to swing, the connecting pin 311(F) can slide along the second sliding groove 384 (F-M); the height of the guide rail plate 38 where the second sliding groove 384(F-M) is located can move up and down along the mounting frame 39(P-Q) through the adjusting knob 7(O-N), when the guide rail plate 38 where the second sliding groove 384(F-M) is located is at a high position, F-G is longer, the swing amplitude of the point F is larger, the transmission member 35(F-E) drives the presser bar 361(C-D) to move up and down to form a larger movement, and the presser bar lifting height is higher; on the contrary, when the guide rail plate 38 where the second sliding groove 384(F-M) is located is in the low position, F-G is shorter, the swing amplitude of the point F is smaller, the transmission member 35(F-E) drives the presser bar 361(C-D) to move up or down, so that the formation of the presser bar lifting height is smaller; after the adjustment is finished, the N point is locked, and the height of the pressure foot lifting is kept fixed, or only when the height of the pressure foot lifting needs to be adjusted, the heights of the N point and the F-M need to be changed, and in other states, the heights of the N point and the F-M are kept fixed. The shape of the second sliding groove 384(F-M) may be an arc, a spline, a straight line or a slant line, as long as the presser foot lifting mechanism 3 can meet the use requirement. The connecting pin 311(F) may be in direct contact with the groove wall of the second sliding groove 384(F-M) of the second rail plate arm 382, or may be in indirect contact with the groove wall by fitting a rotatable slider 368 around the connecting pin 311.

Further, in the schematic diagram of the presser foot lifting mechanism 3 shown in fig. 19, the height position of the guide rail plate 38 where the second sliding groove 384F-M is located is controlled by the external action point N, and the control manner of the point N in the presser foot lifting height adjusting assembly 37 shown in fig. 19 is as follows: by the eccentric shaft portion 741 of the adjusting knob 7, which may also be realized in other ways; such as: in the presser foot elevation adjustment assembly 37 shown in fig. 20, the control manner of the N points is: the adjustment is realized through threads; alternatively, in the lifting and pressing foot height adjusting assembly 37 shown in fig. 21 and 22, the control manner of the N points is as follows: the height adjustment of the pressure foot is realized by a wrench T-O-N, wherein O is a fixed swing fulcrum of the wrench, the T end is positioned outside the shell 8, and the N end of the wrench can be driven to move upwards or downwards by pulling the T end of the wrench, so that the height adjustment of the pressure foot is realized.

Further, as shown in fig. 23, the presser foot lifting cam chute 48 includes a presser foot lifting section 482 and a presser foot releasing section 483 which are connected end to end in sequence, and since the presser foot lifting mechanism 3 needs to share one driving motor 6 with the upper thread trimming mechanism 1 and the lower thread trimming mechanism 2, the presser foot lifting cam chute 48 further includes a presser foot lifting idle stroke section 481. The change rule of the radius of the presser foot lifting cam chute 48 is as follows: the radius of the pressure foot lifting section 482 is gradually increased, the radius of the pressure foot releasing section 483 is gradually reduced, and the diameter change of the pressure foot lifting idle stroke section 481 is unchanged. When the presser foot lifting roller 324 is fitted to the groove peripheral surface of the presser foot lifting idle stroke section 481, the presser foot lifting drive crank 32 is not operated, and the presser foot is in a laid-down state in which the buttonholing machine performs a sewing operation, a surface thread cutting operation, and a bottom thread cutting operation. When the presser foot lifting roller 324 is matched with the groove peripheral surface of the presser foot lifting section 482, the presser foot lifting driving crank 32 swings clockwise around a sixth fixed swing fulcrum O6, the presser foot lifting driving crank 32 drives the presser foot lifting swing rod 34 to swing anticlockwise around a seventh fixed swing fulcrum O7 through an adapter 33, the presser foot lifting swing rod 34 drives the presser foot lifting swing rod 362 to swing anticlockwise around an eighth fixed swing fulcrum O8 through a transmission piece 35, the presser foot lifting connecting rod 363 and the bracket 367 are driven to move upwards together under the mutual matching action of the first guide groove 366 and the sliding block 368, and the presser foot driving rod 361 and the presser foot synchronously move upwards to realize presser foot lifting. When the presser foot lifting roller 324 is matched with the groove peripheral surface of the presser foot releasing section 483, the presser foot lifting driving crank 32 swings anticlockwise around a sixth fixed swing fulcrum O6, the presser foot lifting driving crank 32 drives the presser foot lifting swing rod 34 to swing clockwise around a seventh fixed swing fulcrum O7 through an adapter 33, the presser foot lifting swing rod 34 drives the presser foot lifting swing rod 362 to swing clockwise around an eighth fixed swing fulcrum O8 through a transmission piece 35, the presser foot lifting connecting rod 363 and the bracket 367 are driven to move downwards together under the mutual matching action of the first guide groove 366 and the sliding block 368, and the presser foot driving rod 361 and the presser foot synchronously move downwards to realize presser foot releasing. Therefore, the operation sequence of the presser bar 361 is: the origin is the state of the presser foot being laid down → the presser foot being lifted → the presser foot being laid down and returning to the origin.

In the present embodiment, the trajectory changes of the first upper trimming cam chute 41, the second upper trimming cam chute 42, the first lower trimming cam chute 51, the second lower trimming cam chute 52, and the presser foot lifting cam chute 48 are as shown in fig. 30, but of course, the trajectory changes of the five cam chutes may be different in the buttonholing machines of different sizes. Fig. 31 is a timing chart showing the operation of the upper thread trimming mechanism 1, the lower thread trimming mechanism 2 and the presser foot lifting mechanism 3, and as can be seen from fig. 31: after the buttonholing machine is started, the driving motor 6 drives the upper cam 4 and the lower cam 5 to rotate, at the moment, the presser foot lifting roller 324 is matched with a presser foot placing section 483 of the presser foot lifting cam chute 48, the first upper trimming roller 121 and the second upper trimming roller 131 are matched with the upper trimming idle stroke section 47, and the first lower trimming roller 221 and the second lower trimming roller 231 are matched with the lower trimming idle stroke section 57, so that the presser foot lifting mechanism 3 executes the presser foot placing action, and the upper trimming mechanism 1 and the lower trimming mechanism 2 do not act; after a distance of set up, upper scissor assembly 143 is opened, followed by the opening of the lower scissor assembly; after a further distance, the upper scissor assembly 143 and the lower scissor assembly move to their respective positions to be cut; when the sewing is finished, the upper scissors assembly 143 firstly cuts off the upper thread by driving the tracks of the first upper trimming cam chute 41, the second upper trimming cam chute 42, the first lower trimming cam chute 51 and the second lower trimming cam chute 52, and when the action of the upper scissors assembly 143 is about to finish, the lower scissors assembly starts to cut the bottom thread; after the upper thread is cut off, the lower scissors assembly starts to sweep and cut the thread, so that the residual thread end of the upper thread can be pulled down, and the thread end of the upper thread is reduced; after the thread cutting is finished, the upper scissors assembly 143 and the lower scissors assembly start to return to respective original points; then, the presser foot lifting mechanism 3 immediately starts to lift the presser foot, and one cycle is completed after the presser foot is lifted to the highest position.

In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (18)

1. The utility model provides a buttonhole sewing machine, is including last trimming mechanism (1) that is used for cutting the facial line and being used for lifting presser foot lift presser foot mechanism (3) of presser foot, its characterized in that: the upper trimming mechanism (1) comprises an upper trimming drive component (11) and an upper trimming execution component (14) which is connected with the upper trimming drive component (11) and driven by the upper trimming drive component (11) to act, the presser foot lifting mechanism (3) comprises a presser foot lifting drive component (31) and a presser foot lifting execution component (36) which is connected with the presser foot lifting drive component (31) and driven by the presser foot lifting drive component (31) to act, and the upper trimming drive component (11) and the presser foot lifting drive component (31) are driven by the same drive motor (6) to act; the upper trimming mechanism is characterized by further comprising an upper cam (4), wherein the upper cam (4) is directly or indirectly driven to rotate by a driving motor (6), and the upper trimming driving assembly (11) and the presser foot lifting driving assembly (31) are connected with the upper cam (4); the upper trimming executing assembly (14) comprises a first rocker (141), a second rocker (142) and an upper trimming assembly (143) for trimming upper threads, and the upper trimming driving assembly (11) comprises a first upper trimming cam sliding chute (41) and a second upper trimming cam sliding chute (42) which are arranged on an upper cam (4), a first upper trimming driving rod group (12) and a second upper trimming driving rod group (13); the first upper trimming cam chute (41) and the second upper trimming cam chute (42) are both in a closed curve shape, and the first upper trimming cam chute (41) and the second upper trimming cam chute (42) respectively comprise an upper trimming cutting section (43), an upper trimming section-to-be-cut section (44), an upper trimming cutting section (45) and an upper trimming resetting section (46) which are sequentially connected end to end; the first upper trimming driving rod group (12) is provided with a rotatable first upper trimming roller (121), the first upper trimming roller (121) is embedded into a first upper trimming cam sliding groove (41) of the upper cam (4) and is matched with the first upper trimming cam sliding groove (41), and the tail end of the first upper trimming driving rod group (12) is hinged with a first rocker (141) and is used for controlling the opening and closing of the upper trimmer assembly (143); be equipped with on the second on the trimming actuating lever group (13) rotatable second trimming roller (131), trimming roller (131) are gone up to the second in trimming cam spout (42) on the second of cam (4) is gone up in the embedding and cooperate with trimming cam spout (42) on the second, the end of trimming actuating lever group (13) is articulated mutually with second rocker (142), is used for controlling the walking of going up scissors subassembly (143) on the second, the radial change law of first trimming cam spout (41) is: the radius of the upper trimming line cutting section (43) is gradually reduced and then gradually increased, the radius of the upper trimming line section to be trimmed (44) is gradually reduced and then gradually increased, the radius of the upper trimming line trimming section (45) is gradually reduced, the tail end of the upper trimming line trimming section is provided with the minimum radius of the first upper trimming line cam sliding groove (41), and the radius of the upper trimming line resetting section (46) is unchanged and then gradually increased.

2. The buttonholing machine according to claim 1, wherein: the driving motor (6) is vertically installed and is provided with a motor output shaft extending up and down, and the upper end of the motor output shaft of the driving motor (6) extends upwards from the motor shell of the driving motor (6) and then is fixed with the upper cam (4).

3. The buttonholing machine according to claim 1, wherein: the first upper trimming driving rod group (12) comprises a first upper trimming driving crank (122) and a first upper trimming connecting rod (123) extending in a bending mode, one end of the first upper trimming driving crank (122) is provided with a first fixed swing fulcrum (O1), the other end of the first upper trimming driving crank (122) is hinged to one end of the first upper trimming connecting rod (123), the other end of the first upper trimming connecting rod (123) is hinged to the first rocker (141), and the first upper trimming roller (121) is rotatably mounted on the first upper trimming driving crank (122).

4. The buttonholing machine according to claim 1, wherein: the second upper trimming driving rod group (13) comprises a second upper trimming driving crank (132) and a second upper trimming connecting rod (133) extending in a bending mode, one end of the second upper trimming driving crank (132) is provided with a second fixed swing fulcrum (O2), the other end of the second upper trimming driving crank (132) is hinged to one end of the second upper trimming connecting rod (133), the other end of the second upper trimming connecting rod (133) is hinged to the second rocker (142), and the second upper trimming roller (131) is rotatably mounted on the second upper trimming driving crank (132).

5. The buttonholing machine according to claim 1, wherein: the first upper trimming cam sliding groove (41) and the second upper trimming cam sliding groove (42) are respectively formed in the upper end face and the lower end face of the upper cam (4).

6. The buttonholing machine according to claim 1, wherein: the change rule of the radius of the second upper trimming cam chute (42) is as follows: the radius of the upper trimming line cutting section (43) is unchanged firstly and then gradually reduced, the radius of the upper trimming line section to be trimmed (44) is gradually increased firstly and then unchanged, the radius of the upper trimming line trimming section (45) is gradually increased, the tail end of the upper trimming line trimming section is provided with the maximum radius of the second upper trimming line cam sliding groove (42), and the radius of the upper trimming line resetting section (46) is gradually reduced.

7. The buttonholing machine according to claim 1, wherein: the first upper trimming cam sliding groove (41) and the second upper trimming cam sliding groove (42) further comprise an upper trimming idle stroke section (47), the upper trimming idle stroke section (47) is located between the upper trimming resetting section (46) and the upper trimming cutting section (43), and the radius of the upper trimming idle stroke section (47) is unchanged.

8. The buttonholing machine according to claim 1, wherein: the presser foot lifting actuating component (36) is provided with a presser foot rod (361), the presser foot lifting driving component (31) comprises a presser foot lifting cam chute (48) arranged on the upper cam (4), a presser foot lifting driving crank (32) with a sixth fixed swing fulcrum (O6), a presser foot lifting roller (324) rotatably connected at one end of the presser foot lifting driving crank (32), a presser foot lifting swing rod (34) with one end connected with the other end of the presser foot lifting driving crank (32) and a seventh fixed swing fulcrum (O7), and a transmission piece (35), the presser foot lifting cam chute (48) is in a closed curve shape, the presser foot lifting roller (324) is embedded into the presser foot lifting cam chute (48) of the upper cam (4) and is matched with the presser foot lifting cam chute (48), one end of the transmission piece (35) is hinged with the other end of the presser foot lifting swing rod (34), the other end of the transmission piece (35) is connected with the presser foot lifting execution component (36) and drives the presser foot rod (361) to move up or down.

9. The buttonholing machine according to claim 8, wherein: the pressure foot lifting driving crank (32) is connected with the pressure foot lifting swing rod (34) through a connecting piece (33), the connecting piece (33) comprises a connecting piece body portion (331) and a connecting piece shaft portion (332) vertically and downwardly extending from the lower end of the connecting piece body portion (331), a pressure foot lifting fixing pin (333) extending front and back is fixed in one end of the pressure foot lifting swing rod (34), the connecting piece shaft portion (332) penetrates through the other end of the pressure foot lifting driving crank (32) in a rotatable and axially movable mode, and the pressure foot lifting fixing pin (333) penetrates through the connecting piece body portion (331) in a rotatable and axially movable mode.

10. The buttonholing machine according to claim 8, wherein: the lower end of the lifting and pressing foot driving crank (32) is provided with a torsion spring (335), and the torsion spring (335) enables the lifting and pressing foot roller (324) to be tightly attached to the groove peripheral surface of the lifting and pressing foot cam sliding groove (48).

11. The buttonholing machine according to claim 8, wherein: the presser foot lifting and executing assembly (36) comprises a presser foot lifting and swinging rod (362) with an eighth fixed swinging fulcrum (O8), a presser foot lifting and swinging connecting rod (363), a guide plate (365) with relatively fixed positions and a support (367), a first guide groove (366) extending up and down is arranged in the guide plate (365), a protruding sliding block (368) is arranged on the bracket (367), the presser bar (361) is fixed in the bracket (367), the other end of the transmission piece (35) is hinged with one end of the presser lifting swing rod (362), the other end of the presser foot lifting swing rod (362) is hinged with the upper end of a presser foot lifting connecting rod (363), the lower end of the presser foot lifting connecting rod (363) is hinged with a sliding block (368), and the sliding block (368) is positioned in a first guide groove (366) of the guide plate (365) and can slide up and down in the first guide groove (366).

12. The buttonholing machine according to claim 11, wherein: an adjusting groove (364) extending up and down is formed in the presser foot lifting connecting rod (363), and the presser foot lifting swinging rod (362) is hinged with the presser foot lifting connecting rod (363) through a shaft position screw (9) penetrating in the adjusting groove (364); and a pressure spring is sleeved on the presser bar (361), and the upper end and the lower end of the pressure spring are respectively abutted against a shell (8) and a support (367) of the buttonholing machine.

13. The buttonholing machine according to claim 9, wherein: the presser foot lifting mechanism (3) further comprises a presser foot lifting height adjusting assembly (37) acting on a hinge point of the presser foot lifting swing rod (34) and the transmission piece (35), and the presser foot lifting height adjusting assembly (37) is used for adjusting the height position of the hinge point of the presser foot lifting swing rod (34) and the transmission piece (35).

14. The buttonholing machine according to claim 13, wherein: the lifting and pressing foot height adjusting component (37) comprises a guide rail plate (38) capable of moving up and down, an operating piece for driving the guide rail plate (38) to move up and down and a connecting pin (311), the rail plate (38) has a first rail plate arm portion (381) and a second rail plate arm portion (382) which are arranged in parallel, the operating piece is connected with a first guide rail plate arm part (381), the second guide rail plate arm part (382), one end of the transmission piece (35) and the other end of the presser foot lifting and swinging rod (34) are hinged through the connecting pin (311), a first chute (341) extending along the length direction of the presser foot lifting swing rod (34) is arranged in the presser foot lifting swing rod (34), the second guide rail plate arm part (382) is provided with a second sliding chute (384) which extends along the length direction of the second guide rail plate arm part (382), the connecting pin (311) is arranged in the first sliding chute (341) and the second sliding chute (384) in a penetrating way.

15. The buttonholing machine according to claim 14, wherein: the presser foot lifting height adjusting assembly (37) further comprises an installation frame (39), the installation frame (39) comprises an installation frame fixing part (391) fixed with the shell (8) of the buttonholing machine and an installation frame guide part (392) provided with a second guide groove (393) extending up and down, the guide rail plate (38) further comprises a guide rail plate body part (383) located between the first guide rail plate arm part (381) and the second guide rail plate arm part (382), a guide bolt (310) is fixed on the guide rail plate body part (383), and the guide bolt (310) penetrates through the second guide groove (393) of the installation frame guide part (392).

16. The buttonholing machine according to claim 14, wherein: the operating piece is an adjusting knob (7) capable of being quickly clutched, the adjusting knob (7) comprises an adjusting limit plate (71) with a fixed position, a rotating shaft (72) rotatably penetrating the adjusting limit plate (71), a knob (73) fixed at one end of the rotating shaft (72), an adjusting wheel (74) fixed at the other end of the rotating shaft (72), and a spring (75) located between the knob (73) and the adjusting limit plate (71), the spring (75) is in a compressed state, a limit protrusion is arranged on one end face, facing the adjusting limit plate (71), of the adjusting wheel (74), an eccentric shaft part (741) eccentrically arranged with the rotating shaft (72) is arranged on the other end face, facing away from the adjusting limit plate (71), of the adjusting wheel (74), and a limit concave part matched with the limit protrusion is arranged on the adjusting limit plate (71), and faces the adjusting wheel (74); when the knob (73) is pressed, the limiting protruding part on the adjusting wheel (74) is separated from the limiting concave part on the adjusting limiting plate (71), and the knob (73) drives the adjusting wheel (74) to rotate through the rotating shaft (72); when the knob (73) is loosened, the limiting protruding part on the adjusting wheel (74) is matched with the limiting concave part on the adjusting limiting plate (71), and the adjusting knob (7) is self-locked.

17. The buttonholing machine of claim 16, wherein: the limiting protruding part on the adjusting wheel (74) is a limiting bolt (742), and the limiting concave part on the adjusting limiting plate (71) is a plurality of limiting holes (711); when the knob (73) is loosened, the end of the limiting bolt (742) is inserted into one limiting hole (711) of the limiting holes (711).

18. The buttonholing machine of claim 17, wherein: two stop pins (712) are arranged on one end face, facing the adjusting wheel (74), of the adjusting limiting plate (71), and the two stop pins (712) are located at two ends of the limiting concave part respectively and used for limiting the rotation of the limiting bolt (742).

Images