CN215163641U - A drive wheel and sewing machine for trimming and lift presser foot - Google Patents

Abstract

The utility model belongs to the technical field of sewing machines, in particular to a driving wheel for trimming and lifting presser foot and a sewing machine, which comprises a driving wheel body, wherein a lifting and pressing cam part and a trimming curved surface part are respectively arranged on the driving wheel body, two sides of the lifting and pressing cam part are respectively provided with a first non-executed lifting and pressing stroke surface and a second executed lifting and pressing top end stroke surface, a first lifting and pressing process stroke surface and a second lifting and pressing process stroke surface are arranged between the first non-executed lifting and pressing stroke surface and the second executed lifting and pressing top end stroke surface, and the trimming curved surface part is provided with a first non-executed trimming stroke surface, a second executed trimming top end stroke surface, a first trimming process stroke surface and a second trimming process stroke surface. And can realize the action of trimming under lifting the presser foot state, solve prior art and can not carry out the problem of trimming when lifting the presser foot.

Description

A drive wheel and sewing machine for trimming and lift presser foot

Technical Field

The utility model relates to a sewing machine technical field refers in particular to a drive wheel and sewing machine that is used for trimming and lifts presser foot.

Background

Along with the continuous improvement of sewing machine degree of automation, sewing machine generally possesses automatic thread trimming mechanism and lifts presser foot mechanism automatically, realizes respectively that the action of automatic presser foot and automatic thread trimming is lifted to save time, reduce the labour, improve work efficiency.

For example, the invention discloses a sewing machine and an automatic presser foot lifting and trimming control method, wherein the publication number is CN 109537194A.

Although the device can realize automatic trimming or presser foot lifting action through the rotation of the motor, the trimming and presser foot lifting mechanisms cannot work simultaneously, and only the trimming or presser foot lifting mechanisms can be controlled independently in one period.

Therefore, the structure of the existing overlock sewing machine needs to be further improved.

Disclosure of Invention

The utility model aims at providing a drive wheel and sewing machine for trimming and lift presser foot solves the problem of function singleness through the structure of the drive wheel body of novel design.

The purpose of the utility model is realized like this: a drive wheel for trimming and lifting presser foot, comprises

The wire shearing machine comprises a driving wheel body, wherein a pressure lifting cam part and a wire shearing curved surface part are respectively arranged on the driving wheel body, a first non-pressure lifting idle stroke surface and a second pressure lifting top idle stroke surface are respectively arranged on two sides of the pressure lifting cam part, a first pressure lifting process stroke surface and a second pressure lifting process stroke surface are arranged between the first non-pressure lifting idle stroke surface and the second pressure lifting top idle stroke surface, a first non-wire shearing idle stroke surface and a second shearing top idle stroke surface are arranged on two sides of the wire shearing curved surface part, and a first shearing process stroke surface and a second shearing process stroke surface are arranged between the first non-wire shearing idle stroke surface and the second shearing top idle stroke surface;

the pressure foot lifting connecting rod assembly is positioned on the side surface of the pressure cam part and is connected with the pressure foot lifting assembly and used for executing pressure foot lifting action;

the trimming connecting rod assembly is positioned on the side surface of the trimming curved surface part, is connected with the trimming assembly and is used for executing trimming action;

the rotating area of the driving wheel body can be divided into a first adjusting area, a second adjusting area, a third adjusting area, a fourth adjusting area and a fifth adjusting area, and the first adjusting area, the second adjusting area, the third adjusting area, the fourth adjusting area and the fifth adjusting area form a continuous circular area;

the first non-execution pressure lifting empty stroke surface and the first thread trimming process stroke surface correspond to a first adjusting area;

the first stroke surface in the pressure lifting process and the first idle stroke surface without the thread trimming correspond to a second adjusting area;

the second stroke surface of the top end which is subjected to lifting and pressing and the second stroke surface of the thread trimming process correspond to a third adjusting area;

the second stroke surface in the pressure lifting process and the second idle stroke surface at the top end of the executed trimming line correspond to a fourth adjusting area;

the empty stroke surface of the top end of the lifted and pressed part corresponds to a fifth adjusting area;

an origin point is arranged on the driving wheel body, the origin point is a junction point of the first adjusting area and the second adjusting area, a junction point between the first adjusting area and the fourth adjusting area is marked as a first junction point, a junction point between the fourth adjusting area and the third adjusting area is marked as a second junction point, a junction point between the third adjusting area and the fifth adjusting area is marked as a third junction point, and a junction point between the fifth adjusting area and the second adjusting area is marked as a fourth junction point;

the driving wheel body can rotate for 360 degrees, the angle of the first junction point relative to the origin is 90 degrees +/-15 degrees, the angle of the second junction point relative to the origin is 180 degrees +/-15 degrees, the angle of the third junction point relative to the origin is 270 degrees +/-15 degrees, and the angle of the fourth junction point relative to the origin is 280 degrees +/-15 degrees;

when the driving wheel body rotates clockwise to the first adjusting area, the presser foot lifting connecting rod assembly and the thread trimming connecting rod assembly are located in the first adjusting area, the presser foot lifting assembly is in idle stroke contact, and the thread trimming assembly performs thread trimming;

when the driving wheel body rotates anticlockwise to the second adjusting area, the presser foot lifting connecting rod assembly and the thread trimming connecting rod assembly are located in the second adjusting area, the thread trimming assemblies are in idle stroke contact, and the presser foot lifting assembly performs a presser foot lifting action;

when the driving wheel body rotates anticlockwise to the fifth adjusting area, the presser foot lifting connecting rod assembly is located in the fifth adjusting area, the presser foot lifting assembly is lifted, and the thread trimming assembly can move anticlockwise to perform the thread trimming action by keeping the presser foot lifting assembly in the third adjusting area in a lifting state;

the driving wheel body rotates clockwise and passes through the first adjusting area, the fourth adjusting area, the third adjusting area and the fifth adjusting area in sequence, the thread cutting assembly performs thread cutting action, the presser foot lifting assembly performs presser foot lifting action, and after the actions are completed, the driving wheel body resets clockwise.

A sewing machine comprises a machine shell, wherein a motor is transversely arranged on one side of the machine shell, a driving wheel body is arranged on an output shaft of the motor, a driving pin shaft which drives a trimming connecting rod assembly within a certain stroke is arranged in a trimming curved surface portion, and the driving pin shaft is connected with the trimming connecting rod assembly.

Preferably, the presser foot lifting connecting rod assembly comprises a rotating shaft which is rotatably arranged in the machine shell, a middle lever is installed at one end of the rotating shaft, the upper end of the middle lever is located on one side of the presser foot lifting cam portion, and the other end of the rotating shaft is connected with the presser foot lifting assembly.

Preferably, the periphery of axis of rotation is installed the drive block, seted up the arc wall on the middle lever, the one end shaping of drive block has the ejector pad, and the ejector pad setting is in the arc wall.

Preferably, a rotatable foot-controlled lifting and pressing lever is arranged on the machine shell, one end of the foot-controlled lifting and pressing lever is connected with the lower end of the middle lever through a pull rod, and the other end of the foot-controlled lifting and pressing lever is connected with a foot-controlled lifting and pressing assembly.

Preferably, the upper end of the middle lever is formed with a pushing part, and the pushing part is provided with a rotatable rotating wheel.

Preferably, a reset torsion spring is arranged between the lower end of the middle lever and the machine shell.

Preferably, the thread trimming connecting rod assembly comprises a long rocker arm, the upper end of the long rocker arm is provided with the driving pin shaft, the middle part of the long rocker arm is hinged on the casing or the upper end of the long rocker arm is hinged on the machine body, the middle part of the long rocker arm is provided with the driving pin shaft, the lower end of the long rocker arm is hinged with a short rocker arm, the other end of the short rocker arm is hinged with a crank, and the other end of the crank is connected with the thread trimming assembly.

Preferably, the end of the driving pin shaft is spherical; the pressure raising cam part is arranged on the periphery of the driving wheel body in a protruding mode.

Preferably, a plane bearing is arranged between the driving wheel body and the end face of the motor, and a limiting block is installed at the outer end of the driving wheel body.

Compared with the prior art, the utility model outstanding and profitable technological effect is:

1. the utility model discloses a design of drive wheel realizes that a motor can be synchronous respectively or asynchronous control lifts presser foot subassembly and trimming subassembly action, and can 360 operations two actions of accomplishing, simple structure reduces manufacturing cost, and is efficient to can realize the trimming action lifting under the presser foot state, solve and can not carry out the problem of trimming when lifting the presser foot among the current motor drive technique.

2. The utility model discloses a drive wheel can 360 moving designs, can guarantee motor operation under any angle, can not cause the mechanical hinge to block various strong wearing and tearing that cause with the striking, the fracture, or damage the problem.

Drawings

Fig. 1 is a schematic structural view of a driving wheel body.

Fig. 2 is a schematic structural view of a trimming curved surface portion on the driving wheel body.

Fig. 3 is a schematic structural view of the pressure raising cam portion on the drive wheel body.

FIG. 4 is a schematic structural diagram of the overedger.

Fig. 5 is a first structural schematic diagram of the driving wheel, the presser foot lifting connecting rod assembly and the thread trimming connecting rod assembly.

Fig. 6 is a second structural schematic diagram of the driving wheel, the presser foot lifting connecting rod assembly and the thread trimming connecting rod assembly.

Fig. 7 is a schematic structural diagram of a driving wheel, an intermediate lever and a long rocker arm.

Fig. 8 is a third schematic structural diagram of the driving wheel, the presser foot lifting connecting rod assembly and the thread trimming connecting rod assembly.

Reference numerals: 1-a machine shell; 2, a motor; 3-a reset torsion spring; 4-lifting the presser foot assembly; 5-a thread trimming assembly; 6-lifting and pressing the lever by foot control; 7-a pull rod; 8-plane bearings; 9-a limiting block; 10-a drive wheel body;

12-cutting a curved surface part; 13-a spring; 14-lifting the pressure cam part; 20-lifting the presser foot link assembly; 21-a rotating shaft; 22-intermediate lever; 23-a drive block; 30-a trimming link assembly; 31-a drive pin;

32-long rocker arm; 33-rocker arm fixing plate; 34-short rocker arm; 35-crank 221-arc slot; 222-a pushing part; 223-a rotating wheel; 231-a push block;

121-no trimming idle stroke face one; 122-the line cutting executed top end idle stroke surface two; 123-stroke surface one in the process of trimming;

124-stroke surface II in the thread trimming process;

141-no pressure raising empty stroke face one; 142-the executed lifting and pressing top end idle stroke surface two; 143-lifting and pressing process stroke surface one;

144-lifting and pressing process stroke surface two;

a1 — first regulatory region; a2 — second regulatory region; a 3-third regulatory region; a 4-fourth regulatory region;

a 5-fifth regulatory region;

p 0-origin; p 1-boundary point one; p 2-boundary point two; p 3-boundary point three; p 4-boundary point four.

Detailed Description

The following describes the present invention in further detail with reference to the accompanying drawings.

With reference to fig. 1, 2 and 3, a driving wheel for trimming and lifting presser foot comprises

The wire shearing machine comprises a driving wheel body 10, wherein a pressure lifting cam part 14 and a wire shearing curved surface part 12 are respectively arranged on the driving wheel body 10, a first non-pressure lifting idle stroke surface 141 and a second non-pressure lifting top idle stroke surface 142 are respectively arranged on two sides of the pressure lifting cam part 14, a first pressure lifting process stroke surface 143 and a second pressure lifting process stroke surface 144 are arranged between the first non-pressure lifting idle stroke surface 141 and the second non-pressure lifting top idle stroke surface 142, a first non-wire shearing idle stroke surface 121 and a second shearing top idle stroke surface 122 are arranged on two sides of the wire shearing curved surface part 12, and a first wire shearing process stroke surface 123 and a second wire shearing process stroke surface 124 are arranged between the first non-pressure lifting idle stroke surface 121 and the second shearing top idle stroke surface 122;

the pressure foot lifting connecting rod assembly 20 is positioned on the side surface of the pressure cam part 14, and the pressure foot lifting connecting rod assembly 20 is connected with the pressure foot lifting assembly 4 and is used for executing pressure foot lifting action;

the trimming connecting rod assembly 30 is positioned on the side surface of the trimming curved surface part 12, and the trimming connecting rod assembly 30 is connected with the trimming component 5 and is used for executing trimming;

the rotation area of the driving wheel body 10 can be divided into a first regulation area A1, a second regulation area A2, a third regulation area A3, a fourth regulation area A4 and a fifth regulation area A5, wherein the first regulation area A1, the second regulation area A2, the third regulation area A3, the fourth regulation area A4 and the fifth regulation area A5 form a continuous 360-degree circular area;

the first non-pressure-lifting idle stroke surface 141 and the second pressure-lifting top idle stroke surface 142 correspond to the state of keeping lifting or putting down the pressure-lifting foot assembly 4 respectively;

the first lifting and pressing process stroke surface 143 and the second lifting and pressing process stroke surface 144 correspond to the lifting and pressing processes of the presser foot lifting assembly 4 respectively;

when the first trimming-executed stroke surface 121 reaches the second trimming-executed stroke surface 122, the first trimming-process stroke surface 123 and the second trimming-process stroke surface 124 are passed, so that the trimming assembly 5 executes the trimming operation.

The first non-performed lift-off stroke plane 141 and the first trimming process stroke plane 123 correspond to the first adjustment area a 1;

the first lifting and pressing process stroke surface 143 and the first non-cutting-line-cutting idle stroke surface 121 correspond to the second adjusting area a 2;

the second lift-off top end empty stroke face 142 and the second trimming process stroke face 124 which have been performed correspond to the third adjustment area a 3;

the second lifting and pressing process stroke surface 144 and the second executed trimming top end idle stroke surface 122 correspond to a fourth adjusting area A4;

the second lift-and-press top end idle stroke face 142 executed corresponds to the fifth regulation area a 5;

an origin p0 is arranged on the driving wheel body 10, the origin p0 is a boundary point between the first adjustment area a1 and the second adjustment area a2, a boundary point between the first adjustment area a1 and the fourth adjustment area a4 is marked as a boundary point one p1, a boundary point between the fourth adjustment area a4 and the third adjustment area A3 is marked as a boundary point two p2, a boundary point between the third adjustment area A3 and the fifth adjustment area a5 is marked as a boundary point three p3, and a boundary point between the fifth adjustment area a5 and the second adjustment area a2 is marked as a boundary point four p 4;

the driving wheel body 10 can rotate 360 degrees without dead points to solve the problem of mechanical part twisting caused by abnormal work of the motor, and realizes origin positioning, clockwise and anticlockwise rotation through programming of a system controller,

the angle of the first junction point p1 relative to the origin p0 is 90 ° ± 15 °, the angle of the second junction point p2 relative to the origin p0 is 180 ° ± 15 °, the angle of the third junction point p3 relative to the origin p0 is 270 ° ± 15 °, the angle of the fourth junction point p4 relative to the origin p0 is 280 ° ± 15 °, ± 15 ° in the present technical solution, and the variable angle range region of each junction point can be adjusted according to actual conditions.

In the device, the specific scheme is that the angle of the first boundary point p1 relative to the origin p0 is 85 degrees, the angle of the second boundary point p2 relative to the origin p0 is 195 degrees, the angle of the third boundary point p3 relative to the origin p0 is 280 degrees, and the angle of the fourth boundary point p4 relative to the origin p0 is 290 degrees.

1. The method for independently executing the thread cutting is as follows:

when the driving wheel body 10 rotates clockwise to the first adjusting area a1, the lifting and pressing foot link assembly 20 and the trimming link assembly 30 are located in the first adjusting area a1, that is, the lifting and pressing foot link assembly 20 passes through a first unexecuted lifting and pressing idle stroke plane 141, the trimming link assembly 30 passes through a first trimming process stroke plane 123, at this time, the lifting and pressing foot assembly 4 does not execute any action in idle stroke contact, then the trimming assembly 5 executes the trimming action from an original point p0 to a first junction point p1, and returns to the original point p0 after reciprocating once;

2. the method for independently lifting the presser foot comprises the following steps:

when the driving wheel body 10 rotates anticlockwise to the second adjusting area a2, the lifting pressure foot connecting rod assembly 20 and the trimming connecting rod assembly 30 are located in the second adjusting area a2, that is, the lifting pressure foot connecting rod assembly 20 passes through a first lifting pressure process stroke surface 143, the trimming connecting rod assembly 30 passes through a first non-trimming idle stroke surface 121, and at the moment, the idle stroke contact of the trimming assembly 5 does not perform any action, so that the lifting pressure foot assembly 4 performs a pressure foot lifting action from an original point p0 to a junction point four p4, and returns to the original point p0 after reciprocating once;

3. the method for trimming the thread when the pressure foot is lifted and the lifting state of the pressure foot is kept after the pressure foot is lifted comprises the following steps:

when the driving wheel body 10 rotates anticlockwise to the fifth adjusting area A5, the lifting presser foot connecting rod assembly 20 is located in the fifth adjusting area A5, the lifting presser foot assembly 4 is lifted, the thread trimming assembly 5 can execute the third adjusting area A3 through anticlockwise movement, namely, the thread trimming action is carried out when the lifting presser foot assembly 4 keeps a lifting state from a junction point three p3 to a junction point two p2, the thread trimming returns to the fifth adjusting area A5 after reciprocating once, and the lifting presser foot assembly 4 can manually control thread trimming repeatedly through the controller under the condition that the lifting presser foot assembly 4 keeps the lifting state;

4. the method for continuously executing the action of lifting the presser foot after trimming comprises the following steps:

the driving wheel body 10 rotates clockwise to pass through a first adjusting area A1, a fourth adjusting area A4, a third adjusting area A3 and a fifth adjusting area A5 in turn, the thread trimming component 5 executes thread trimming action, the consecutive presser foot lifting component 4 executes presser foot lifting action,

that is, the thread cutting and the presser foot lifting actions complete two actions within one circle of the driving wheel body 10

The method comprises the following steps: clockwise executing half stroke of trimming action (closing edge process) from an original point p0 to a boundary point p1, continuously executing lifting state of presser foot action from the boundary point p1 to a boundary point two p2, continuously executing the latter half stroke (opening edge process) of trimming action from the boundary point two p2 to a boundary point three p3 to a fifth adjusting area A5, keeping the lifting state of the fifth adjusting area A5 area by the presser foot after trimming execution is finished,

after the actions are finished, the pressure foot lifting assembly is rotated clockwise to enable the pressure foot lifting assembly to lower the pressure foot to the reset original point p 0. The actions of trimming and lifting the presser foot are executed by rotating 360 degrees;

5. the method for lifting the presser foot after the trimming is finished comprises the following steps:

firstly, executing the method 1 of independently executing the thread trimming, and continuously executing the method 2 of independently executing the method of lifting the presser foot. In the production sewing application, different methods can be used for operation corresponding to different production process technical requirements, and various auxiliary functions are realized;

the utility model provides a drive wheel body 10 can 5 actions of independent control trimming subassembly, moreover, the steam generator is simple in structure, the equipment cost is reduced, and is convenient and practical, when lifting the presser foot and not acting, can through automatically controlled execution trimming action, and when the presser foot action is lifted in the motor control execution, can also through automatically controlled execution trimming action, perhaps through manual button, control trimming mechanism action, carry out manual trimming, the motor is closed zone initial point step motor, the absolute initial point p0 position of the automatic encoder of looking for of start

With reference to fig. 4 to 7, a sewing machine includes a housing 1, a motor 2 is transversely disposed on one side of the housing 1, the driving wheel body 10 is disposed on an output shaft of the motor 2, a driving pin 31 for driving a trimming link assembly 30 within a certain stroke is disposed in a trimming curved surface portion 12, and the driving pin 31 is connected with the trimming link assembly 30.

The utility model discloses a design of drive wheel body 10, drive wheel body 10 can 360 clockwise or anticlockwise rotations, carry out synchronous or asynchronous trimming respectively and lift presser foot work, and a motor 2 can control respectively and lift presser foot subassembly 4 and 5 actions of trimming subassembly, accomplishes two actions, simple structure, reduction equipment cost, convenient and practical to when the execution lifts the presser foot action, can also carry out the trimming action, convenient to use.

Next, a specific structure of the presser foot lifting link assembly 20 will be further described, where the presser foot lifting link assembly 20 includes a rotating shaft 21 rotatably disposed in the housing 1, an intermediate lever 22 is mounted at one end of the rotating shaft 21, an upper end of the intermediate lever 22 is located at one side of the presser cam lifting portion 14, when the driving wheel body 10 rotates, the intermediate lever 22 will be pushed and driven to rotate, and the presser foot lifting assembly 4 is connected to the other end of the rotating shaft 21, so as to drive the presser foot lifting assembly 4 to operate.

The drive block 23 is installed to the periphery of axis of rotation 21, the arc wall 221 has been seted up on the middle lever 22, and the one end shaping of drive block 23 has ejector pad 231, and ejector pad 231 sets up in arc wall 221, and in the actual work process, when middle lever 22 rotated, will drive the drive block 23 through the cooperation of arc wall 221 and ejector pad 231 and rotate, drive axis of rotation 21 simultaneously and rotate.

The sewing machine is characterized in that a rotatable foot control lifting and pressing lever 6 is arranged on the machine shell 1, one end of the foot control lifting and pressing lever 6 is connected with the lower end of a middle lever 22 through a pull rod 7, the other end of the foot control lifting and pressing lever 6 is connected with a foot control lifting and pressing assembly, in the actual working process, a lifting pressing plate on the sewing machine is stepped by a foot, the foot control lifting and pressing assembly drives the foot control lifting and pressing lever 6 to rotate, the middle lever 22 in the pressing foot connecting rod assembly 20 is driven to rotate through the pull rod 7, and the pressing foot is lifted by foot.

The structure of the current market is as follows: lift presser foot and trimming can not simultaneous working, and the utility model discloses a lift the structure setting for the separation between presser foot link assembly 20 and the drive wheel body 10, consequently can the simultaneous working, advance to lift the presser foot in single step and can control with step motor, also can with traditional foot chain simultaneous control, when the presser foot is lifted to the foot chain, can the simultaneous operation button step-by-step trimming, in the trimming, also can carry out the foot chain simultaneously and lift the presser foot, and present current single step advance the trimming is unable the realization the utility model discloses a function.

The upper end of the middle lever 22 is formed with a pushing part 222, the pushing part 222 is provided with a rotatable rotating wheel 223, and the rotating wheel 223 is used for contacting with the pressure raising cam part 14, so that friction force can be reduced, abrasion can be reduced, and the service life can be prolonged.

And a reset torsion spring 3 is arranged between the lower end of the middle lever 22 and the machine shell 1, and the reset torsion spring 3 is used for resetting the middle lever 22.

Next, the specific structure of the trimming link assembly 30 is further described, where the trimming link assembly 30 includes a long rocker 32, the upper end of the long rocker 32 is provided with the driving pin 31, the middle of the long rocker 32 is hinged with a rocker fixing plate 33, and the other end of the rocker fixing plate 33 is connected with the casing 1, and referring to fig. 8 in particular, the structure of the long rocker 32 may also be: the upper end of long rocking arm 32 articulates on the organism, and the middle part of long rocking arm 32 is provided with drive pin 31, and the lower extreme of long rocking arm 32 articulates there is short rocking arm 34, and the other end of short rocking arm 34 is connected with trimming subassembly 5, and when drive pin 31 passed through trimming curved surface portion 12, will stimulate long rocking arm 32 to through short rocking arm 34 pulling scissors subassembly 5 motion, when drive pin 31 passed through trimming curved surface portion 12, will drive long rocking arm 32 and rotate, and drive scissors subassembly 5 through short rocking arm 34 and move.

The end of the drive pin 31 is spherical to facilitate its sliding within the shear curve section 12.

The trimming curved surface part 12 is formed on one side surface of the driving wheel body 10, a driving groove is formed in the driving wheel body 10, and the trimming curved surface part 12 is formed on the side wall of the driving groove.

Wherein, still be provided with the spring 13 that is used for making its reset on trimming link assembly 30, the spring includes extension spring or torsional spring etc. and when only trimming curved surface portion 12 unilateral promoted trimming subassembly 5, trimming subassembly 5's return will rely on the effect of spring 13 to reset.

Be provided with flat bearing 8 between the terminal surface of drive wheel body 10 and motor 2, stability when can improving drive wheel body 10 and rotate, stopper 9 is installed to the outer end of drive wheel body 10, can restrict the shift position of drive pin 31, prevents that the skew of drive pin 31 from breaking away from drive wheel body 10.

The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. A driving wheel for trimming and lifting presser foot is characterized by comprising

The wire shearing machine comprises a driving wheel body (10), wherein a pressure lifting cam part (14) and a wire shearing curved surface part (12) are respectively arranged on the driving wheel body (10), a first non-pressure lifting idle stroke surface (141) and a second top-end idle stroke surface (142) which is already subjected to pressure lifting are respectively arranged on two sides of the pressure lifting cam part (14), a first pressure lifting process stroke surface (143) and a second pressure lifting process stroke surface (144) are arranged between the first non-pressure lifting idle stroke surface (141) and the second top-end idle stroke surface (142) which is already subjected to pressure lifting, a first non-wire shearing idle stroke surface (121) and a second top-end idle stroke surface (122) which is already subjected to wire shearing are arranged on two sides of the wire shearing curved surface part (12), and a first wire shearing process stroke surface (123) and a second wire shearing process stroke surface (124) are arranged between the first non-pressure lifting idle stroke surface (121) and the second top-end idle stroke surface (122) which is already subjected to wire shearing;

the pressure foot lifting connecting rod assembly (20) is positioned on the side surface of the pressure cam lifting part (14), and the pressure foot lifting connecting rod assembly (20) is connected with the pressure foot lifting assembly (4) and is used for executing pressure foot lifting action;

the trimming connecting rod assembly (30) is positioned on the side surface of the trimming curved surface part (12), and the trimming connecting rod assembly (30) is connected with the trimming assembly (5) and is used for executing trimming;

the rotating area of the driving wheel body (10) can be divided into a first adjusting area (A1), a second adjusting area (A2), a third adjusting area (A3), a fourth adjusting area (A4) and a fifth adjusting area (A5), and the first adjusting area (A1), the second adjusting area (A2), the third adjusting area (A3), the fourth adjusting area (A4) and the fifth adjusting area (A5) form a continuous circular area;

the first non-pressure-lifting stroke surface (141) and the first thread trimming stroke surface (123) correspond to a first adjustment area (A1);

the first lifting and pressing process stroke surface (143) and the first non-cutting-line-cutting idle stroke surface (121) correspond to a second adjusting area (A2);

the second lifting and pressing top end empty stroke surface (142) and the second trimming process stroke surface (124) correspond to a third adjusting area (A3);

a second lifting and pressing process stroke surface (144) and a second executed trimming top end idle stroke surface (122) correspond to a fourth adjusting area (A4);

the second lifting and pressing top end idle stroke surface (142) corresponds to a fifth adjusting area (A5);

an origin (p0) is arranged on the driving wheel body (10), the origin (p0) is a boundary point of a first adjusting area (A1) and a second adjusting area (A2), a boundary point between the first adjusting area (A1) and a fourth adjusting area (A4) is a boundary point I (p1), a boundary point between the fourth adjusting area (A4) and a third adjusting area (A3) is a boundary point II (p2), a boundary point between the third adjusting area (A3) and a fifth adjusting area (A5) is a boundary point III (p3), and a boundary point between the fifth adjusting area (A5) and the second adjusting area (A2) is a boundary point IV (p 4);

the drive wheel body (10) is rotatable by 360 degrees, the angle of the first boundary point (p1) with respect to the origin (p0) is 90 ° ± 15 °, the angle of the second boundary point (p2) with respect to the origin (p0) is 180 ° ± 15 °, the angle of the third boundary point (p3) with respect to the origin (p0) is 270 ° ± 15 °, and the angle of the fourth boundary point (p4) with respect to the origin (p0) is 280 ° ± 15 °.

2. A sewing machine, characterized in that, has the drive wheel for trimming and presser foot lifting of claim 1, including a casing (1), a motor (2) is transversely arranged on one side of the casing (1), the drive wheel body (10) is arranged on the output shaft of the motor (2), a drive pin shaft (31) for driving a trimming link assembly (30) within a certain stroke is arranged in the trimming curved surface portion (12), and the drive pin shaft (31) is connected with the trimming link assembly (30).

3. A sewing machine according to claim 2, wherein: the trimming connecting rod assembly (30) comprises a long rocker arm (32), the upper end of the long rocker arm (32) is provided with a driving pin shaft (31), the middle part of the long rocker arm (32) is hinged to the machine shell (1) or the upper end of the long rocker arm (32) is hinged to the machine body, the middle part of the long rocker arm (32) is provided with the driving pin shaft (31), the lower end of the long rocker arm (32) is hinged to a short rocker arm (34), the other end of the short rocker arm (34) is hinged to a crank (35), and the other end of the crank (35) is connected with a trimming assembly (5).

4. A sewing machine according to claim 2, wherein: the end part of the driving pin shaft (31) is spherical; the pressure raising cam part (14) is arranged on the periphery of the driving wheel body (10) in a protruding mode.

5. A sewing machine according to claim 2, wherein: a plane bearing (8) is arranged between the end faces of the driving wheel body (10) and the motor (2), and a limiting block (9) is installed at the outer end of the driving wheel body (10).

6. A sewing machine according to claim 2, wherein: the pressure foot lifting connecting rod component (20) comprises a rotating shaft (21) which is rotatably arranged in the machine shell (1), a middle lever (22) is installed at one end of the rotating shaft (21), the upper end of the middle lever (22) is located on one side of the pressure lifting cam portion (14), and the other end of the rotating shaft (21) is connected with a pressure foot lifting component (4).

7. A sewing machine according to claim 6, wherein: the periphery of axis of rotation (21) is installed drive block (23), arc wall (221) have been seted up on middle lever (22), and the one end shaping of drive block (23) has ejector pad (231), and ejector pad (231) sets up in arc wall (221).

8. A sewing machine according to claim 6, wherein: the machine shell (1) is provided with a rotatable foot control lifting and pressing lever (6), one end of the foot control lifting and pressing lever (6) is connected with the lower end of the middle lever (22) through a pull rod (7), and the other end of the foot control lifting and pressing lever (6) is connected with a foot control lifting and pressing assembly.

9. A sewing machine according to claim 6, wherein: the upper end of the middle lever (22) is formed with a pushing part (222), and the pushing part (222) is provided with a rotatable rotating wheel (223).

10. A sewing machine according to claim 9, wherein: and a reset torsion spring (3) is arranged between the lower end of the middle lever (22) and the machine shell (1).

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