CN111945306A - Concealed drive structure of lifting device for presser foot of crank-arm sewing machine - Google Patents

Abstract

The utility model provides a crank arm sewing machine presser foot lifting device's hidden type drive structure, includes: a containing cavity arranged inwards from the side surface of the crank arm of the sewing machine; the driving device is arranged in the accommodating hole and comprises a driving rod, so that the driving rod can extend out of the side surface of the crank arm, and the stroke range of the driving rod does not exceed the upper part of the end surface of the top end of the crank arm; and a connecting rod group which is composed of a plurality of connecting rods and is arranged between the cloth pressing foot of the sewing machine and the stroke of the driving rod, wherein the first end of the connecting rod group is driven by the driving rod, so that the second end of the connecting rod group is linked with the cloth pressing foot to move up and down.

Description

Concealed drive structure of lifting device for presser foot of crank-arm sewing machine

technical field

The invention relates to a concealed driving structure of a lifting device for a presser foot of a crank-arm sewing machine.

Background technique

The so-called crank arm sewing machine uses a crank arm to suspend a main machine and a sewing platform. The operator feeds the cloth from the front of the main machine. The drive motor used to drive the main machine is installed at the rear of the main machine. When the operator finishes sewing or stops sewing In addition to lifting the presser foot upward, the drive motor behind the main machine must also be manually rotated to lift the sewing needle up, and then the sewing object can be withdrawn.

Taiwan Utility Model Patent No. M252719 or M271878, as shown in Figure 1, the current articulated arm sewing machine is usually equipped with a presser foot lifting device to facilitate sewing operations. The presser foot lifting device includes a drive unit 130 , which is connected between the driving unit 130 and the presser foot 160 by a driving mechanism 140 , through the driving of the driving unit 130 , an electromagnet 131 is raised to lift the presser foot 160 in conjunction. In the above structure, the driving unit 130 is vertically embedded from the top of a machine table 120, and its electromagnet 131 can push up a driving mechanism 140 horizontally placed above the machine table 120. Since most sewing machines operate The operator is right-handed, so when the operator stretches the right arm A to rotate the shaft 111 of the drive unit 130, the arm A must pass over the drive unit 130, the electromagnet 131 and the driving mechanism 140 exposed at the top of the crank arm, so that the By turning the rotating shaft 111 of the driving unit 130, the operator's arm A will come into contact with the driving unit 130 and the driving mechanism 140, which may easily cause accidents such as cuts to the operator. In addition, the exposed type will also affect the operator's operation. smoothness of action.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a concealed driving structure for the lifting device of the presser foot of a crank arm sewing machine, which includes: an accommodating hole arranged inward from the side of the crank arm of the sewing machine; a driving device, which is arranged in the accommodating hole and the driving device includes a driving rod, so that the driving rod can extend from the side surface of the crank arm, and the stroke range of the driving rod does not exceed the top end face of the crank arm; and a connecting rod group, It is composed of a plurality of connecting rods and is installed between the sewing machine presser foot and the stroke of the driving rod. The first end of the connecting rod group is driven by the driving rod, so that the second end of the connecting rod group is linked to the presser foot. , lower movement.

In the concealed driving structure of the lifting device for the presser foot of the crank arm sewing machine disclosed in the present invention, the accommodating hole is horizontally arranged in the crank arm.

In the concealed driving structure of the lifting device for the presser foot of the curved arm sewing machine disclosed in the present invention, one end of the curved arm forms a fixing seat to be fixed on a fixed object, so that the accommodating hole is vertically projected on the fixed object. within the seat range. The center of gravity of the driving device placed in the accommodating hole falls within the range of the fixing seat, so as to prevent the crank arm of the sewing machine from being subjected to a bending moment and causing vibration.

The concealed drive structure of the lifting device for the presser foot of the crank-arm sewing machine disclosed in the present invention, wherein the connecting rod group includes: a first rocker arm pivotally mounted on the fixed object, and the first rocker arm is provided with an actuating part , the bottom end of the actuating part is extended to the stroke of the driving rod, so that the driving rod is linked; the second rocker arm is pivotally mounted on the fixed object, and is longitudinally connected along the axis direction of the second rocker arm A shaft is extended, and a toggle block is arranged at the end of the shaft to link the up and down displacement of the presser foot; a connecting rod is pivotally connected between the first rocker arm and the second rocker arm.

The concealed driving structure of the lifting device for the presser foot of the crank-arm sewing machine disclosed in the present invention, wherein the driving device is a solenoid valve or a pneumatic cylinder or a hydraulic cylinder.

In the concealed driving structure of the lifting device for the presser foot of the crank arm sewing machine disclosed in the present invention, the accommodating hole is horizontally penetrated through the crank arm.

In the concealed driving structure of the lifting device of the presser foot of the crank-arm sewing machine disclosed in the present invention, the peripheral edge of the accommodating hole is provided with a fixing hole for locking the fixing plate, so as to stably fix the driving device on the in the hole.

Due to the concealed drive structure of the lifting device for the presser foot of the curved arm sewing machine disclosed in the present invention, there is no mechanical structure installed directly above the curved arm, and the top surface of the curved arm is a flat surface, so the operator can directly lift the arm The adjustment of the drive motor rotating shaft astride the crank arm can not only avoid the operator's injury, but also improve the smoothness of the operator's operation.

Description of drawings

FIG. 1 is a schematic diagram of a cloth presser foot lifting device of an exposed articulated arm sewing machine in the prior art.

FIG. 2 is a perspective view of a concealed driving structure of a cloth presser foot lifting device of a crank-arm sewing machine disclosed in an embodiment of the present invention.

FIG. 3 is a partial perspective exploded view of a concealed drive structure of the lifting device for the presser foot of the crank-arm sewing machine disclosed in the embodiment of the present invention.

FIG. 4 is an exploded perspective view of FIG. 3 from another perspective.

FIG. 5 is a perspective view of FIG. 3 after assembly and the device with the presser foot.

FIG. 6 is a schematic front view of FIG. 2 .

FIG. 7 is a schematic diagram of another embodiment of the present invention.

Description of reference numbers:

10 Side surface of crank arm 10a 10b Top end surface

11 accommodating hole 111 fixing hole 112 fixing plate

12 Holder 20 Drive 21 Drive Rod

30 connecting rod set 30a first end 30b second end

31 The first rocker arm 311 The actuating part 32 The second rocker arm

321 Axle 322 Block 33 Tie Rod

40 Presser foot W Center of gravity

Detailed ways

Please refer to FIGS. 2-6. The present invention is a concealed drive structure of the lifting device of the presser foot of a crank arm sewing machine, comprising: an accommodating hole 11 set inward from the side 10a of the crank arm 10 of the sewing machine; a The driving device 20 is installed in the accommodating hole 11 , and the driving device 20 includes a driving rod 21 , so that the driving rod 21 can extend from the side surface 10a of the crank arm 10 , and make the travel range of the driving rod 21 Not exceeding the top end face 10b of the crank arm 10 and a connecting rod group 30, composed of a plurality of connecting rods, installed between the presser foot 40 of the sewing machine and the stroke of the driving rod 21, the first end of the connecting rod group 30 30a is the actuation of the driving rod 21, so that the second end 30b of the connecting rod group 30 is used to link the presser foot 40 to move up and down.

As shown in FIGS. 2 , 3 and 6 , in the concealed drive structure of the lifting device for the presser foot of the crank arm sewing machine disclosed in the present invention, the accommodating hole 11 is horizontally arranged in the crank arm 10 .

As shown in FIG. 7 , the concealed driving structure of the lifting device for the presser foot of the crank arm sewing machine disclosed in the present invention, wherein one end of the crank arm 10 forms a fixing seat 12 to be fixed on a fixed object such as a table top, so that the The accommodating hole 11 is vertically projected within the range of the fixing seat 12 . The center of gravity W of the driving device 20 placed in the accommodating hole 11 is placed within the range of the fixing seat 12 to prevent the crank arm 10 of the sewing machine from being vibrated by a bending moment.

As shown in Figures 2, 3, and 4, in the concealed drive structure of the lifting device for the presser foot of the crank-arm sewing machine disclosed in the present invention, the connecting rod group 30 includes: a first rocker arm 31, which is pivotally mounted on a fixed object and can On the casing of the sewing machine, the first rocker arm 31 is provided with an actuating portion 311, and the bottom end of the actuating portion 311 extends to the stroke of the driving rod 21, so that the driving rod 21 is linked; the second rocker arm 32 is pivotally mounted on the casing of the sewing machine, which can be the fixed object. Along the axis direction of the second rocker arm 32, a shaft rod 321 is extended longitudinally, and a toggle block 322 is arranged at the end of the shaft rod 321 to use A link 33 is pivotally connected between the first rocker arm 31 and the second rocker arm 32 .

In the concealed driving structure of the lifting device for the presser foot of the crank-arm sewing machine disclosed in the present invention, the driving device 20 refers to a solenoid valve or an air/hydraulic cylinder, which is not limited by the present invention.

As shown in Figures 2 and 3, in the concealed drive structure of the lifting device for the presser foot of the crank-arm sewing machine disclosed in the present invention, the accommodating hole 11 horizontally penetrates the crank arm 10; The hole 11 is set in the crank arm 10 at an angle, which is not limited by the present invention.

As shown in FIG. 4 , in the concealed driving structure of the lifting device for the presser foot of the crank-arm sewing machine disclosed in the present invention, the periphery of the accommodating hole 11 is provided with a fixing hole 111 for locking the fixing plate 112 to The driving device 20 is fixed in the accommodating cavity 11 .

As shown in FIG. 1 or 7, due to the concealed drive structure of the presser foot lifting device of the crank arm sewing machine disclosed in the present invention, there is no mechanical structure installed directly above the top end face 10b of the crank arm 10, so the top end face of the crank arm 10 is not installed. 10b is a flat surface, the operator can directly straddle the arm above the crank arm to adjust the rotation axis of the drive motor 20, which not only avoids the operator's injury, but also improves the smoothness of the operation.

The structure, features and effects of the present invention have been described in detail above according to the embodiments shown in the drawings. The above are only the preferred embodiments of the present invention, but the scope of the present invention is not limited by the drawings. Changes made to the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, shall fall within the protection scope of the present invention as long as they do not exceed the spirit covered by the description and drawings.

Claims (7)

1. A concealed drive structure of a presser foot lifting device of a crank-arm sewing machine, characterized in that, comprising: an accommodating hole provided inward from the side of the crank arm of the sewing machine; A driving device is arranged in the accommodating cavity, and the driving device includes a driving rod, so that the driving rod can extend from the side of the crank arm, and the stroke range of the driving rod does not exceed the crank arm the top end face; and A connecting rod group, consisting of a plurality of connecting rods, is installed between the presser foot of the sewing machine and the stroke of the driving rod. The first end of the connecting rod group is driven by the driving rod, so that the second end of the connecting rod group is driven by the driving rod. Link up and down movement of the presser foot. 2 . The concealed drive structure of the lifting device for the presser foot of a crank-arm sewing machine according to claim 1 , wherein the accommodating hole is horizontally arranged in the crank-arm. 3 . 3 . The concealed drive structure of the lifting device for the presser foot of a crank arm sewing machine according to claim 1 , wherein one end of the crank arm forms a fixing seat to be fixed on a fixing object, so that the accommodating hole is formed. 4 . Projected vertically within the range of the mount. 4. The concealed drive structure of the lifting device for the presser foot of a crank-arm sewing machine according to claim 1, wherein the connecting rod group comprises: a first rocker arm pivotally mounted on a fixed object, the first rocker arm There is an actuating part, the bottom end of the actuating part is extended to the stroke of the driving rod, so that the driving rod is linked; the second rocker arm is pivotally mounted on the fixed object, along the axis direction of the second rocker arm , extending a shaft longitudinally, and a toggle block is arranged at the end of the shaft to link the up and down displacement of the presser foot; a connecting rod is pivotally connected to the first rocker arm and the second rocker arm between. 5 . The concealed driving structure of the lifting device for the presser foot of the crank-arm sewing machine according to claim 1 , wherein the driving device is a solenoid valve or a pneumatic cylinder or a hydraulic cylinder. 6 . 6 . The concealed drive structure of the lifting device for the presser foot of a crank-arm sewing machine according to claim 1 , wherein the accommodating hole penetrates the crank arm horizontally. 7 . 7 . The concealed driving structure of the lifting device of the presser foot of the crank-arm sewing machine according to claim 1 , wherein the peripheral edge of the accommodating hole is provided with a fixing hole for locking the fixing plate to stabilize the driving device. 8 . fixed in the accommodating cavity.

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