CN212771306U - Presser foot lifting mechanism of sewing machine - Google Patents

Abstract

The utility model belongs to the technical field of sewing machine equipment, concretely relates to sewing machine lift presser foot mechanism. The sewing machine solves the problems that the conventional sewing machine has too long stroke for pulling the handle rod, and has large amplitude and inconvenience. This sewing machine includes the casing, the front end of lifting pull rod is articulated with the lifting lever, the end of lifting pull rod is articulated with the lifting plate, this lift presser foot mechanism including lifting the presser foot subassembly automatically and manually lifting the presser foot subassembly, it includes linear drive device to lift the presser foot subassembly automatically, it is connected with the crank to rotate on linear drive device's the output, the pivot has been linked firmly on the crank, it can drive lifting plate pivoted rotor plate to link firmly in the pivot, manually lift the presser foot subassembly including rotating the presser foot spanner shaft that sets up in the casing, presser foot spanner shaft level is placed, presser foot spanner shaft one end is stretched out the casing external connection and is had the presser foot spanner, the other end links firmly and can makes lifting plate pivoted cam that pushes down. The utility model discloses realize lifting up that the presser foot can be convenient when lifting the presser foot subassembly automatically and became invalid.

Description

Presser foot lifting mechanism of sewing machine

Technical Field

The utility model belongs to the technical field of sewing machine equipment, concretely relates to sewing machine lift presser foot mechanism.

Background

A sewing machine is a machine that uses one or more sewing threads to form one or more stitches in a material to be sewn, thereby interweaving or stitching one or more layers of material. When the sewing machine sews or embroiders the cloth, a presser foot is needed to be arranged on the sewing machine, and the presser foot applies pressure on the surface of the sewing material so as to ensure the stability of the cloth at the needle falling position of the needle of the sewing machine. When the sewing machine feeds materials, the presser foot presses on the cloth, when the sewing machine feeds materials and discharges the materials, the presser foot is lifted upwards, and the lifting of the presser foot is realized by the presser foot lifting mechanism.

With the continuous lifting of the technical level of the sewing machine, the lifting or falling of the presser foot controlled by the air cylinder appears in the existing sewing machine. For example, chinese patent application No. 201721007558.8 discloses a starting presser foot lifting mechanism of a sewing machine, wherein a cylinder is rotatably connected with a crank, the crank is connected with a lifting plate, and the lifting plate is connected with a lifting pull rod. The cylinder works to drive the crank to rotate, the crank drives the lifting plate to rotate, and the lifting plate pulls the lifting pull rod to lift the pressure rod, so that the pressure foot connected to the pressure rod is lifted.

Although the technical scheme enables the sewing machine to realize automatic pressure lever lifting to a certain extent, the automation degree of the sewing machine is improved, when the air cylinder or a component for driving the lifting plate to rotate is damaged or the air cylinder is not ventilated, the lifting of the presser foot is very inconvenient.

For example, in chinese patent application No. 200920057571.3, a pneumatic hand-operated presser foot lifting device for a sewing machine is proposed, in which a handle lever is manually moved from a vertical state to a horizontal state in order to turn the handle lever from the horizontal state, and an end of the handle lever is moved from a top of the sewing machine to a side of the sewing machine, so that if a user manually lifts the presser foot, a stroke for pulling the handle lever is too long and large, which is inconvenient.

Disclosure of Invention

The utility model aims at having the above-mentioned problem to current technique, provided a sewing machine lift presser foot mechanism, the utility model aims to solve the technical problem that: how to realize when automatic lifting presser foot subassembly became invalid, the presser foot can be convenient lifts.

The purpose of the utility model can be realized by the following technical proposal:

the utility model provides a sewing machine lift presser foot mechanism, sewing machine includes the casing, promote the lever, promote the pull rod and rotate the lifting plate that sets up in the casing, promote the front end of pull rod and promote the lever articulated, promote the end of pull rod and promote the board articulated, its characterized in that, originally, it lifts the presser foot subassembly including automatic lifting presser foot subassembly and manual, lifts the presser foot subassembly including fixing the linear drive device on the casing automatically, the rotation is connected with the crank on linear drive device's the output, has linked firmly the pivot on the crank, has linked firmly in the pivot and can has driven lifting plate pivoted rotor plate, manual presser foot subassembly of lifting is including rotating the presser foot spanner axle that sets up in the casing, and presser foot spanner axle level is placed, and presser foot spanner axle one end stretches out the casing outer joint has the presser foot spanner, and the other end links firmly and can make lifting plate pivoted cam that pushes down.

The automatic presser foot lifting assembly comprises a linear driving device for providing power, the linear driving device drives a crank to rotate, the crank drives a rotating shaft fixedly connected with the crank to rotate, the rotating shaft drives a rotating plate fixedly connected with the rotating shaft to rotate, the rotating plate rotates to drive a lifting plate to rotate, the lifting plate pulls a lifting pull rod hinged with the lifting plate, and the lifting pull rod acts on a lifting lever to lift the presser foot; the manual presser foot subassembly of lifting includes the presser foot spanner, if need manually lift the presser foot, then only need stir the presser foot spanner and drive the presser foot spanner axle and use its axis to rotate as rotation center, the presser foot spanner axle rotates and drives down the cam rotation and make the lifting plate take place to rotate, lifting plate pulling rather than articulated lifting pull rod, lifting pull rod effect makes the presser foot lift on promoting the lever, the presser foot spanner is located the lateral part of casing all the time, and stir presser foot spanner pivoted stroke weak point, operating personnel can lift up the presser foot through manual the convenient with the presser foot of lifting the presser foot subassembly. Because this sewing machine lift presser foot mechanism including automatic lift presser foot subassembly and manual lift presser foot subassembly, when automatic lift presser foot subassembly back that became invalid, still can be convenient through manual lift presser foot subassembly make the presser foot lift.

In the presser foot lifting mechanism of the sewing machine, the lifting plate is provided with a lower pressing handle rod and an upper lifting handle rod, a mounting hole is formed between the lower pressing handle rod and the upper lifting handle rod, the rotating shaft penetrates through the mounting hole, and the mounting hole is in clearance fit with the rotating shaft. Because clearance fit is between mounting hole and the pivot, after pushing down the handle pole or lifting the handle pole atress on, the lifting plate uses the pivot to rotate as rotation center.

In the presser foot lifting mechanism of the sewing machine, the rotating plate is provided with a poking shaft positioned below the lifting handle rod. The rotating plate rotates anticlockwise under the driving of the rotating shaft, the shifting shaft can move upwards to abut against the lifting handle rod, lifting force is applied to the lifting handle rod, the rotating plate rotates anticlockwise by taking the rotating shaft as a rotating center, and the lifting pull rod is pulled to move backwards.

In the presser foot lifting mechanism of the sewing machine, the pressing cam is positioned above the pressing handle rod, and the pressing cam is provided with a toggle part capable of applying pressing force to the pressing handle rod. The push-down cam rotates along with the presser foot and wrench shaft anticlockwise, the shifting part gradually butts against the push-down handle rod, and after the push-down handle rod is pressed down, the lifting plate rotates anticlockwise by taking the rotating shaft as a center, and the lifting pull rod is pulled to move backwards.

In the presser foot lifting mechanism of the sewing machine, a limiting pin for limiting the over-rotation of the pressing cam is fixedly arranged in the machine shell, and the shifting part is positioned between the limiting pin and the pressing handle rod. The limiting pin limits the over-rotation of the pressing cam, so that the rotation stroke of the pressing cam is kept consistent, and the operation of a user is facilitated.

In the presser foot lifting mechanism of the sewing machine, the lifting plate is provided with the convex handle, the convex handle is positioned at the front part of the rotating shaft, the shell is also provided with the pin shaft, the pin shaft is positioned above the convex handle, the return spring is arranged between the pin shaft and the convex handle, and two ends of the return spring are respectively connected to the pin shaft and the convex handle. When pushing down cam or rotor plate and being used in on the lifting plate, make lifting plate anticlockwise rotation, the presser foot is lifted up, and the interval grow between protruding handle and the round pin axle, reset spring is stretched, and when pushing down the cam or the power that the rotor plate was used in on the lifting plate disappears, reset spring reconversion drives the lifting plate and resets, and the presser foot falls down.

In the presser foot lifting mechanism of the sewing machine, the linear driving device comprises a telescopic rod, the end part of the telescopic rod, which is positioned outside the linear driving device, is an output end, the output end is connected with the crank shaft through a connecting rod, and two ends of the connecting rod are respectively hinged on the output end and the crank. The both ends of connecting rod are articulated with output and crank respectively, can increase telescopic link and articulate rotational degree of freedom.

Compared with the prior art, the presser foot lifting mechanism of the sewing machine has the following advantages:

1. the automatic presser foot lifting assembly and the manual presser foot lifting assembly are arranged on one sewing machine, and when the automatic presser foot lifting assembly fails, the manual presser foot lifting assembly can lift the presser foot, so that production sewing is not delayed.

2. Mounting hole and pivot clearance fit on the lifting plate, lifting plate and pivot ability relative rotation need not additionally set up dead axle and lifting plate cooperation on the casing, reduce part quantity.

Drawings

Fig. 1 is a schematic perspective view of the sewing machine of the present invention.

Fig. 2 is a schematic perspective view of another view angle of the sewing machine of the present invention.

Fig. 3 is a schematic view of the structural relationship between the automatic presser foot lifting assembly and the manual presser foot lifting assembly.

Fig. 4 is a schematic view of the construction of the lifting plate.

In the figure, 1, a housing; 2. a lifting lever; 3. a lifting plate; 3a, pressing down the handle rod; 3b, lifting the handle rod; 3c, mounting holes; 3d, a convex handle; 4. automatically lifting the presser foot assembly; 4a, a linear driving device; 4a1, telescopic rod; 4b, a crank; 4c, a rotating shaft; 4d, rotating the plate; 4d1, a shifting shaft; 4e, a connecting rod; 5. a manual pressure foot lifting assembly; 5a, a presser foot and spanner shaft; 5b, a pressure foot wrench; 5c, pressing the cam; 5c1, a toggle part; 6. a spacing pin; 7. a return spring; 8. a pin shaft; 9. and lifting the pull rod.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

Example one

As shown in fig. 1 to 4, the sewing machine includes a machine shell 1, a press rod is arranged at the front end of the machine shell 1, a press foot is connected to the bottom end of the press rod, and a press rod guide is connected to the press rod. Still be equipped with in the casing 1 and promote lever 2, promote lever 2 and be L shape, promote lever 2's one end and be located the compression bar guide frame below, the other end articulates there is promotion pull rod 9, and the end of promotion pull rod 9 articulates there is lifting plate 3. The lifting plate 3 is rotatably arranged in the machine shell 1, the lifting pull rod 9 can be pulled by rotating the lifting plate 3, the lifting pull rod 9 drives the lifting lever 2 to rotate, the lifting lever 2 lifts the pressing rod guide frame upwards, and the lifting of the pressing foot is realized.

As shown in fig. 1 to 4, the present presser foot lifting mechanism comprises an automatic presser foot lifting assembly 4 and a manual presser foot lifting assembly 5. Automatic pressure foot lifting component 4 is including fixing linear drive device 4a on casing 1, linear drive device 4a can be electro-magnet or cylinder or pneumatic cylinder, linear drive device 4a includes telescopic link 4a1, the tip that telescopic link 4a1 is located outside linear drive device 4a is the output, it has connecting rod 4e to articulate on the output, it has crank 4b still to articulate on the connecting rod 4e, crank 4b is the L shape, pivot 4c has been linked firmly at crank 4 b's middle part, set up the through-hole that can supply pivot 4c to pass on casing 1, be equipped with the axle sleeve between pivot 4c and the through-hole, pivot 4c is located and has linked firmly rotor plate 4d on one section in the through-hole, be equipped with stirring axle 4d 1. The lifting plate 3 is provided with a lower pressing handle rod 3a and an upper lifting handle rod 3b, a mounting hole 3c is formed between the lower pressing handle rod 3a and the upper lifting handle rod 3b, the rotating shaft 4c penetrates through the mounting hole 3c to enable the lifting plate 3 to be arranged on the rotating shaft 4c, the mounting hole 3c is in clearance fit with the rotating shaft 4c, the lifting plate 3 can rotate by taking the rotating shaft 4c as a rotating point, and the rotating shaft 4c can not directly drive the lifting plate 3 to rotate synchronously. The toggle shaft 4d1 is located below the lift lever 3b, when the rotating plate 4d rotates to drive the toggle shaft 4d1 to move upward, the toggle shaft 4d1 applies an upward force to the lift lever 3b, the lifting plate 3 rotates counterclockwise, and the lifting plate 3 pulls the lifting rod 9 to lift the presser foot.

As shown in fig. 1 to 4, the manual presser foot lifting assembly 5 includes a presser foot wrench shaft 5a, the presser foot wrench shaft 5a is always horizontally disposed, two ends of the presser foot wrench shaft 5a are respectively located inside the casing 1 and outside the casing 1, a pressing cam 5c is fixedly connected to the presser foot wrench shaft 5a located inside the casing 1, a shifting portion 5c1 is provided on the pressing cam 5c, the shifting portion 5c1 is located on the outer peripheral wall of the pressing cam 5c, when the axis of the presser foot wrench shaft 5a is used as the rotation center, and the presser foot wrench shaft 5a is rotated, the pressing cam 5c also follows the rotation center by using the axis of the presser foot wrench shaft 5a, the shifting portion 5c1 will abut against the pressing handle rod 3a and apply downward pressure to the pressing handle rod 3a, so that the lifting plate 3 rotates counterclockwise, and the lifting pull the lifting rod 9 to lift the presser foot. One end of the presser foot wrench shaft 5a positioned outside the machine shell 1 is connected with a presser foot wrench 5b which is wrenched by an operator.

As shown in fig. 1 to 4, a limit pin 6 for limiting the over-rotation of the push-down cam 5c is further fixedly arranged in the housing 1, the toggle portion 5c1 is located between the limit pin 6 and the push-down handle rod 3a, and the limit pin 6 limits the over-clockwise rotation of the push-down cam 5c, so that the rotation stroke of the push-down cam 5c is controlled within a certain range, and the operation is convenient for a user.

As shown in fig. 1 to 4, a protruding handle 3d is further provided on the side surface of the lifting plate 3, the protruding handle 3d is located in front of the rotating shaft 4c, a pin shaft 8 is further provided on the casing 1, the pin shaft 8 is located above the protruding handle 3d, a return spring 7 is provided between the pin shaft 8 and the protruding handle 3d, two ends of the return spring 7 are respectively connected to the pin shaft 8 and the protruding handle 3d, when the pressing cam 5c or the rotating plate 4d acts on the lifting plate 3, the lifting plate 3 rotates counterclockwise, the presser foot is lifted up, the distance between the protruding handle 3d and the pin shaft 8 is increased, the return spring 7 is stretched, when the force acting on the lifting plate 3 by the pressing cam 5c or the rotating plate 4d disappears, the return spring 7 returns to its original state, the lifting plate 3 is driven to reset, and the presser foot falls down.

Because the presser foot lifting mechanism of the sewing machine comprises the automatic presser foot lifting assembly 4 and the manual presser foot lifting assembly 5, when the automatic presser foot lifting assembly 4 fails, the presser foot can still be lifted through the manual presser foot lifting assembly 5. And, because pivot 4c passes mounting hole 3c and makes lifting plate 3 set up on pivot 4c, mounting hole 3c and pivot 4c clearance fit, lifting plate 3 can use pivot 4c to rotate as the rotation point, but the rotation of pivot 4c can directly not drive lifting plate 3 synchronous rotation, so drive pivot 4c pivoted straight line drive 4a just can not directly drive lifting plate 3 and rotate yet, lifting plate 3's motion is relatively independent. Therefore, when the presser foot is lifted by manually lifting the presser foot assembly 5, the presser foot does not need to be lifted against the resistance of the linear driving device 4 a.

Example two

The difference between the present embodiment and the first embodiment is that:

a fixed shaft for installing the lifting plate 3 is fixedly arranged in the machine shell 1, the fixed shaft rotates through an installation hole 3c of the lifting plate 3, and the fixed shaft is in clearance fit with the installation hole 3 c. The rotating plate 4d is hinged with the upper lifting handle rod 3b through a hinge shaft, and the rotating plate 4d rotates anticlockwise to directly drive the lifting plate 3 to rotate. The projecting shank 3d is located on the top edge of the lifting plate 3.

The guide way has been seted up on casing 1, and the guide way is the J form, and presser foot spanner axle 5a is located the guide way, is equipped with down cam 5c on the presser foot spanner axle 5a, and presser foot spanner axle 5a can reciprocate along the guide way, moves down when presser foot spanner axle 5a, and down cam 5c exerts pressure to pushing down handle pole 3a, makes lifting plate 3 anticlockwise rotation, and then lifts up the presser foot. A reset elastic piece is arranged in the machine shell 1, one end of the reset elastic piece is connected to the presser foot and wrench shaft 5a, and the other end of the reset elastic piece is connected to the top of the guide groove.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims (7)

1. A presser foot lifting mechanism of a sewing machine comprises a machine shell (1), a lifting lever (2), a lifting pull rod (9) and a lifting plate (3) which is rotatably arranged in the machine shell (1), wherein the front end of the lifting pull rod (9) is hinged with the lifting lever (2), and the tail end of the lifting pull rod (9) is hinged with the lifting plate (3), and is characterized in that the presser foot lifting mechanism comprises an automatic presser foot lifting assembly (4) and a manual presser foot lifting assembly (5), the automatic presser foot lifting assembly (4) comprises a linear driving device (4a) fixed on the machine shell (1), the output end of the linear driving device (4a) is rotatably connected with a crank (4b), a rotating shaft (4c) is fixedly connected on the crank (4b), a rotating plate (4d) capable of driving the lifting plate (3) to rotate is fixedly connected on the rotating shaft (4c), the manual presser foot lifting assembly (5) comprises a presser foot shaft (5a) which is rotatably arranged in the machine shell (1), the presser foot wrench shaft (5a) is horizontally arranged, one end of the presser foot wrench shaft (5a) extends out of the machine shell (1) and is connected with the presser foot wrench (5b), and the other end of the presser foot wrench shaft is fixedly connected with a pressing cam (5c) which can enable the lifting plate (3) to rotate.

2. The presser foot lifting mechanism of a sewing machine according to claim 1, wherein the lifting plate (3) has a lower pressing handle rod (3a) and an upper lifting handle rod (3b), a mounting hole (3c) is formed between the lower pressing handle rod (3a) and the upper lifting handle rod (3b), the rotating shaft (4c) passes through the mounting hole (3c), and the mounting hole (3c) is in clearance fit with the rotating shaft (4 c).

3. The presser foot lifting mechanism of sewing machine according to claim 2, wherein said rotating plate (4d) has a moving shaft (4d1) located below the lift lever (3 b).

4. The presser foot lifting mechanism of a sewing machine according to claim 2 or 3, wherein said push-down cam (5c) is located above the push-down lever (3a), and the push-down cam (5c) has a dial portion (5c1) capable of applying a pushing-down force to the push-down lever (3 a).

5. The presser foot lifting mechanism of sewing machine according to claim 4, wherein a limit pin (6) for limiting the over-rotation of the pressing cam (5c) is further fixed in the housing (1), and the toggle part (5c1) is located between the limit pin (6) and the pressing handle rod (3 a).

6. The presser foot lifting mechanism of sewing machine according to claim 4, wherein the lifting plate (3) is provided with a protruding handle (3d), the protruding handle (3d) is located at the front part of the rotating shaft (4c), the housing (1) is further provided with a pin shaft (8), the pin shaft (8) is located above the protruding handle (3d), a return spring (7) is arranged between the pin shaft (8) and the protruding handle (3d), and two ends of the return spring (7) are respectively connected to the pin shaft (8) and the protruding handle (3 d).

7. The presser foot lifting mechanism of sewing machine according to claim 1, wherein the linear driving device (4a) comprises a telescopic rod (4a1), the end of the telescopic rod (4a1) located outside the linear driving device (4a) is an output end, the output end is connected with the crank (4b) shaft through a connecting rod (4e), and two ends of the connecting rod (4e) are respectively hinged on the output end and the crank (4 b).

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