CN210916566U - Novel presser foot mechanism is lifted to flush joint machine tangent line - Google Patents

Abstract

The utility model discloses a novel flat bed sewing machine tangent line presser foot lifting mechanism, which comprises a fixed frame, a stepping motor, a first crank, a second crank, a third crank, a crank connecting rod, a short shaft, a forked rod, a slider, a cutter connecting rod, a lower shaft sleeve, a large blade, a small blade and a presser foot lifting crank, wherein the stepping motor is provided with a rotating shaft which synchronously rotates and is respectively connected with the presser foot lifting crank and the first crank; the first crank is linked with the second crank, and the short shaft is connected with the second crank and rotates on the fixed frame; one end of the third crank is connected with the short shaft, and the other end of the third crank is connected with the large blade upper sleeve piece; the fork-shaped rod is hinged on the fixed frame, the sliding block is arranged on the fork-shaped rod, and the extension shaft of the sliding block is fixedly connected with the third crank; the lower end of the forked rod is connected with the small blade sleeve; the sleeve piece is sleeved on the lower shaft sleeve, and the large blade and the small blade are in cross shearing fit. The advantages are that: the utility model discloses reduce machine part, let manufacturing cost obtain reducing to and avoided the interference between the spare part to strike, make life longer.

Description

Novel presser foot mechanism is lifted to flush joint machine tangent line

Technical Field

The utility model belongs to the technical field of the last part of sewing machine, especially, relate to a novel presser foot mechanism is lifted to flush joint machine tangent line.

Background

At present, a thread cutting mechanism and a presser foot lifting mechanism on a lockstitch sewing machine are two parts which work independently, the thread cutting mechanism generally drives a cutter on a tool rest to cut threads by an air cylinder or an electromagnet, the presser foot lifting mechanism generally adopts a small air cylinder or a small electromagnet to drive a presser foot knock pin to carry out lifting operation, the structure has various parts, and execution conflict and impact are easy to generate between the parts, so that the service life of the parts is influenced; meanwhile, the structure has more parts, so the production cost is higher; there is a need for improvement.

Disclosure of Invention

The utility model aims at the not enough of above-mentioned prior art existence, provide a novel presser foot mechanism is lifted to flush joint machine tangent line, it has reduced machine part, lets manufacturing cost obtain reducing to and avoided the interference between the spare part to strike, make the longer characteristics of life.

In order to realize the purpose, the utility model discloses the technical scheme who adopts is: a novel tangent presser foot lifting mechanism of a lockstitch sewing machine comprises a fixing frame, a stepping motor, a first crank, a second crank, a third crank, a crank connecting rod, a short shaft, a forked rod, a sliding block, a cutter connecting rod, a lower shaft sleeve, a large blade, a small blade and a presser foot lifting crank, wherein the stepping motor is fixed on the fixing frame, two ends of the stepping motor are provided with rotating shafts which rotate synchronously, the rotating shaft at one side is connected with the presser foot lifting crank, and the rotating shaft at the other side is connected with the first crank; the first crank is connected with the second crank through a crank connecting rod and is linked with the second crank, the short shaft is fixedly connected with the second crank and is linked with the second crank, and two ends of the short shaft are respectively positioned on the fixed frame and can freely rotate on the fixed frame; one end of the third crank is connected with the end part of the short shaft, and the other end of the third crank is connected with the external member on the large blade through the cutter connecting rod; the fork-shaped rod is hinged to the fixing frame through a pin shaft, the sliding block is fixed at the upper end of the fork-shaped rod, and an extension shaft on the sliding block is fixedly connected with the third crank; the lower end of the forked rod is connected with the external member of the small blade through the cutter connecting rod; the sleeve pieces on the large blade and the small blade are sleeved on the lower shaft sleeve and rotate on the lower shaft sleeve; the lower shaft sleeve is arranged on the fixing frame, and the large blade and the small blade are in cross shearing fit.

The fixing frame is provided with a positioning supporting rod, the positioning supporting rod is positioned between the first crank and the stepping motor and is provided with a positioning hole, and the rotating shaft is inserted in the positioning hole.

After the structure is adopted, compared with the prior art, the utility model the advantage that has is: the utility model drives the rotating shaft to rotate through the stepping motor, and realizes the functions of trimming and lifting the presser foot through the synchronous rotation of the rotating shaft, compared with the prior structure, the structure has fewer mechanical parts, so that the production cost is reduced; meanwhile, interference conflict of mechanical parts is avoided, and the service life is longer.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

The following description is only for the preferred embodiment of the present invention, and the protection scope of the present invention is not limited thereby, the present invention will be further explained with reference to the drawings and the embodiments.

Example, see figure 1: a novel tangent presser foot lifting mechanism of a lockstitch sewing machine comprises a fixed frame 10, a stepping motor 11, a first crank 12, a second crank 13, a third crank 14, a crank connecting rod 15, a short shaft 16, a forked rod 17, a sliding block 18, a cutter connecting rod 19, a lower shaft sleeve 20, a large blade 21, a small blade 22 and a presser foot lifting crank 23, wherein the stepping motor 11 is fixed on the fixed frame 10, and two ends of the stepping motor are provided with rotating shafts 24 which rotate synchronously, wherein the rotating shaft 24 on one side is connected with the presser foot lifting crank 23, and the rotating shaft 24 on the other side is connected with the first crank 12; that is, when the stepping motor 11 is working, the rotating shafts 24 at both ends can rotate in the same direction at the same time, and respectively drive the presser foot lifting crank 23 and the first crank 12 to rotate. The other end of the presser foot lifting crank 23 is connected with a jacking pin 26 in use, and the function of lifting the presser foot is achieved by driving the jacking pin 26 to lift and press. In order to reduce the deviation of the top pin 26 in vertical lifting, the connection position of the top pin 26 and the pressure raising and pressing foot crank 23 is a bevel and bevel connection structure, namely, the extending end of the pressure raising and pressing foot crank 23 has a certain inclination relative to the rotating end thereof, and the top end of the top pin 26 is also in a matched inclined structure. The first crank 12 is connected with the second crank 13 through a crank connecting rod 15 and is linked with the second crank 13, the short shaft 16 is fixedly connected with the second crank 13 and is linked with the second crank 13, and two ends of the short shaft 16 are respectively positioned on the fixed frame 10 and can freely rotate on the fixed frame; in operation, the first crank 12 can drive the second crank 13 to rotate in the same direction, and the second crank 13 can drive the short shaft 16 to rotate. One end of the third crank 14 is connected with the end of the short shaft 16, and the other end is connected with a sleeve on the large blade 21 through a cutter connecting rod 19; i.e. when the stub 16 rotates, it can drive the third crank 14 to rotate, and the third crank 14 drives the large blade 21 to rotate by driving the sleeve on the large blade 21. The sleeve on the large blade 21 is sleeved on the lower shaft sleeve 20 and can freely rotate thereon, and the lower shaft sleeve 20 is arranged on the fixing frame 10, so that when the sleeve rotates, the large blade 21 can perform arc cutting. The forked rod 17 is hinged on the fixed frame 10 through a pin shaft, the slide block 18 is fixed at the upper end of the forked rod 17, and an extension shaft on the slide block is fixedly connected with the third crank 14; in operation, rotation of the third crank 14 causes rotation of the slider 18, and rotation of the fork 17 is caused by the slider 18. The lower end of the forked lever 17 is connected via a cutter link 19 to a set of small blades 22, which are likewise mounted on a lower bushing 20 and rotate freely thereon, and which, when rotated, can drive the small blades 22 to perform an arc cut. The large blade 21 and the small blade 22 are rotated in opposite directions in use to achieve a thread cutting effect.

The utility model discloses specific trimming and lift foot process as follows: the stepping motor 11 rotates anticlockwise, the rotating shaft 24 drives the first crank 12 to rotate anticlockwise, and the second crank 13 connected with the first crank 12 also rotates anticlockwise; the second crank 13 drives the third crank 14 to rotate anticlockwise through the short shaft 16, and the large blade 21 is fed clockwise under the pulling of the third crank 14; meanwhile, the slider 18 connected to the third crank 14 pushes the forked lever 17 to rotate counterclockwise, and the forked lever 17 pulls the small blade 22 to feed counterclockwise, so that the small blade and the large blade 21 can cut the thread while being crossed. When the stepping motor 11 rotates counterclockwise, the rotating shaft 24 on the other side drives one end of the presser foot lifting crank 23 to rotate counterclockwise, and the other end drives the knock pin 26 to move upward, so as to achieve the purpose of lifting the foot. In order to prevent the rotating shaft 24 from deviating, a positioning rod 25 is provided on the fixing frame 10, the positioning rod 25 is located between the first crank 12 and the stepping motor 11 and has a positioning hole thereon, and the rotating shaft 24 is inserted into the positioning hole.

The stepping motor 11 is widely used to drive the two-end rotating shaft 24 to synchronously rotate, and other structures and principles are the same as those in the prior art, and are not described in detail here.

Claims (2)

1. The utility model provides a presser foot mechanism is lifted to novel flush joint machine tangent line which characterized in that: the cutting device comprises a fixed frame (10), a stepping motor (11), a first crank (12), a second crank (13), a third crank (14), a crank connecting rod (15), a short shaft (16), a forked rod (17), a sliding block (18), a cutter connecting rod (19), a lower shaft sleeve (20), a large blade (21), a small blade (22) and a presser foot lifting crank (23), wherein the stepping motor (11) is fixed on the fixed frame (10), two ends of the stepping motor are provided with rotating shafts (24) which rotate synchronously, the rotating shaft (24) on one side is connected with the presser foot lifting crank (23), and the rotating shaft (24) on the other side is connected with the first crank (12); the first crank (12) is connected with the second crank (13) through a crank connecting rod (15) and is in linkage with the second crank, the short shaft (16) is fixedly connected with the second crank (13) and is in linkage with the second crank, and two ends of the short shaft (16) are respectively positioned on the fixed frame (10) and can freely rotate on the fixed frame; one end of the third crank (14) is connected with the end part of the short shaft (16), and the other end of the third crank is connected with a sleeve on the large blade (21) through a cutter connecting rod (19); the fork-shaped rod (17) is hinged on the fixed frame (10) through a pin shaft, the sliding block (18) is fixed at the upper end of the fork-shaped rod (17), and an extension shaft on the sliding block is fixedly connected with the third crank (14); the lower end of the forked rod (17) is connected with a sleeve of the small blade (22) through a cutter connecting rod (19); the external members on the large blade (21) and the small blade (22) are sleeved on the lower shaft sleeve (20) and rotate on the lower shaft sleeve; the lower shaft sleeve (20) is arranged on the fixing frame (10), and the large blade (21) and the small blade (22) are in cross shearing fit.

2. The novel flat bed sewing machine tangent pressure foot lifting mechanism as claimed in claim 1, characterized in that: the fixing frame (10) is provided with a positioning support rod (25), the positioning support rod (25) is positioned between the first crank (12) and the stepping motor (11) and is provided with a positioning hole, and the rotating shaft (24) is inserted and sleeved in the positioning hole.

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