WO2022111510A1

WO2022111510A1 - Feed dog assembly of separate-type sewing machine

Info

Publication number: WO2022111510A1
Application number: PCT/CN2021/132702
Authority: WO
Inventors: 林子春; 潘林勇; 李质彬; 刘霖; 刘冰; 林群; 吴文俊
Original assignee: 琦星智能科技股份有限公司
Priority date: 2020-11-30
Filing date: 2021-11-24
Publication date: 2022-06-02
Also published as: CN114575052A

Abstract

Provided is a feed dog assembly of a separate-type sewing machine, which particularly relates to the technical field of sewing machine manufacturing. In the feed dog assembly, an up-down lifting electric motor and a front-back feeding electric motor respectively apply an up-down swing source and a front-back swing source to a feed dog, and the up-down lifting electric motor and the front-back feeding electric motor indirectly act on the feed dog to execute a feeding action. The up-down lifting electric motor and the front-back feeding electric motor are used to transfer the swing sources to the feed dog assembly, and the feed dog assembly can be additionally mounted on a bottom thread mechanism and manufactured into a modular unit for use on various sewing machines, such that the sewing machine has a more simplified mechanical structure, a higher sewing transmission efficiency, and a higher value of popularization.

Description

A feed dog assembly of a separate sewing machine

technical field

The present application proposes a cloth feed dog assembly of a separable sewing machine, and specifically relates to the technical field of sewing machine manufacturing.

Background technique

A sewing machine is a sewing equipment for sewing garments, bags, shoes and hats, and quilts. In a traditional sewing machine, the main shaft motor is connected to the upper main shaft, and the main shaft motor drives the upper main shaft to rotate, thereby driving the eccentric rotating wheel, the bevel gear and the needle bar crankshaft fixed to the upper main shaft to run at the same time. In the bottom thread sewing transmission mechanism, the eccentric rotating wheel drives the feed link and the lift link at the same time, the feed link drives the feed shaft through the swing seat assembly, and the lift link drives the lift shaft through the lift crank. Swing; the cloth feed shaft and the tooth-lifting shaft are arranged on both sides of the sewing machine base, and the cloth-feeding shaft and the tooth-lifting shaft are jointly connected to the cloth feed dog frame in the middle by a crank. The feeding shaft and the tooth lifting shaft transmit the swing source to the feeding dog frame from the two sides of the feeding dog frame. The direction swings, the swing of the tooth-lifting shaft drives the swinging of the tooth-lifting fork fixed on the tooth-lifting shaft to provide the feed dog with an approximate up and down direction swing. Feed dog running track. At the same time, the bevel gear is connected to the vertical shaft in the vertical direction, the vertical shaft transmits the torque to the lower shaft, and the lower shaft is connected to run the hook by changing the size of the gear to increase the speed by 2 times.

In summary, in the sewing process of the sewing machine, the eccentric rotating wheel, bevel gear and needle bar crankshaft on the main shaft are actually driven by the main shaft motor to realize the coordinated feeding of the cloth feeding dog, the presser foot and the needle, and the rotary hook is used to run. stitching process. The upper and lower linkage transmission mechanism of traditional sewing machines is complex. On the one hand, it causes high noise of the sewing machine. high. The traditional mechanical transmission structure of the sewing machine has been in use since the advent of the sewing machine. A feasible solution is needed to improve the transmission efficiency of the sewing machine, so as to overcome the above-mentioned technical shortcomings, and at the same time, it can reduce the manufacturing difficulty of the sewing machine, reduce the cost of the sewing machine and improve the sewing machine. Intelligent control level.

SUMMARY OF THE INVENTION

Aiming at the problem of the complex mechanical transmission structure of the feed dog existing in the existing sewing machine, the present application provides a cloth feed dog assembly of a separate sewing machine with high transmission efficiency and low manufacturing difficulty, which has the up-down lift motor of the cloth feed dog assembly. The front and rear feeding motors apply up and down and front and rear swing sources to the feeding dog respectively, and the up-down lifting motor and the front and rear feeding motors indirectly act on the feeding dog to perform the feeding action.

Preferably, a tooth-lifting cam and a tooth-lifting cam are respectively installed on the output shafts at both ends of the upper and lower lift motors, and the distal ends of the tooth-lifting cam and the tooth-lifting cam are respectively staggered and act on the feed dog assembly with the bottom of the support frame. of two bumps.

Preferably, the up and down motor is fixed on the bottom plate of the sewing machine.

Preferably, the front and rear feeding motors drive the turntable and then drive the connecting rod, the connecting rod is movably connected to the eccentric position of the turntable, and the connecting rod is movably connected to the feeding dog connecting frame, and the feeding dog is arranged on the feeding dog connecting frame.

Preferably, the copper sleeve swinging rod and the driving end swinging rod at both ends of the feed dog connecting frame are respectively arranged on the fixed copper sleeves at both ends of the support frame, and the feeding dog is connected to the upper part of the feeding dog connecting frame, so the The front and rear feeding motors are fixed on the upper part of the support frame provided by the sewing machine.

Preferably, the front and rear sides of the support frame are respectively provided with support rods, the front and rear positions of the upper and lower lift motors are respectively provided with brackets, and the top of the bracket has a groove, and the support rod is rotatably arranged in the groove.

Preferably, the tooth-lifting cam 1 and the tooth-lifting cam 2 are respectively replaced by a multi-stage cam 1 and a multi-stage cam 2, and the multi-stage cam 1 and the multi-stage cam 2 both have several adjustment high points and several adjustment points. The low point, the adjustment high point and the adjustment low point are installed in dislocation at both ends of the upper and lower lift motors.

Preferably, the adjustment high points of the first multi-stage cam and the second multi-stage cam have adjacent adjustment low points before and after the adjustment high point.

The cloth feed dog assembly of the separate sewing machine of the present application cancels the traditional upper and lower linkage mechanical transmission structure, and uses the up and down lifting motors and the front and rear cloth feeding motors to transmit the swing source to the cloth feed dog assembly, so as to realize the oil-free operation of the cloth feed dog of the sewing machine. , cleverly realize the separation of the upper thread mechanism and the lower thread mechanism on the mechanical transmission, and the feed dog assembly can be added to the lower thread mechanism and can be made into a modular package for use on various sewing machines. The separated sewing machine feed dog assembly of the present application maximizes the transmission efficiency, further realizes the intelligent control of the sewing feed dog assembly, simplifies the mechanical structure of the sewing machine, and the sewing transmission efficiency is higher, and has high promotion value.

Description of drawings

1 is a schematic structural diagram of a feed dog assembly of a separate sewing machine of the present application;

FIG. 2 is a structural diagram of a bottom thread mechanism of a feed dog assembly of a separate sewing machine of the present application;

3 is a schematic diagram of a feed dog assembly of a cloth feed dog assembly of a separate sewing machine of the present application;

4 is a structural diagram of a feed dog of a cloth feed dog assembly of a separate sewing machine of the present application;

5 is a schematic diagram of a feed dog of a cloth feed dog assembly of a separate sewing machine of the present application;

6 is a schematic diagram of a multi-stage cam of a feed dog assembly of a separate sewing machine of the present application;

7 is a schematic diagram of inclined feeding after the feeding dog of a separate sewing machine of the present application;

8 is a schematic diagram of inclined feeding before the feeding dog of a separate sewing machine of the present application;

9 is a schematic diagram of a hook assembly of a feed dog assembly of a separate sewing machine of the present application;

10 is a structural diagram of a hook assembly of a feed dog assembly of a separate sewing machine of the present application;

11 is a schematic diagram of a thread trimmer assembly of a feed dog assembly of a separate sewing machine of the present application;

12 is an internal structure diagram of a thread trimmer assembly of a feed dog assembly of a separate sewing machine of the present application;

13 is a schematic diagram of a thread trimmer push rod of a feed dog assembly of a separate sewing machine of the present application;

14 is a schematic diagram of a thread take-up assembly of a feed dog assembly of a separate sewing machine of the present application;

Fig. 15 is a schematic diagram of a thread take-up disc of a feed dog assembly of a separate sewing machine of the present application.

Reference numerals: upper thread mechanism 10, needle bar 11, needle 12, lower thread mechanism 20, fixed seat 21, bottom plate 211, cloth feed dog assembly 25, cloth feed dog 251, up and down lift motor 252, front and rear cloth feed motor 253, feed The cloth tooth connecting frame 254, the supporting frame 255, the first tooth lifting cam 256, the second tooth lifting cam 257, the needle plate 258, the fixed copper sleeve 259, the driving end swing rod 25a, the copper sleeve swing rod 25b, the turntable 25e, the connecting rod 25f, Bracket 250, support rod 25c, groove 25d, hook assembly 26, suspension hook 261, bobbin thread drive motor 262, notch 262c, hook 263, fixing rod 264, hook fixing seat 265, anti-slip cover 266, hollow Rotary shaft 267, thread stand 268, thread trimmer assembly 27, thread trimmer drive source 271, thread trimmer push rod 272, push block 272a, connecting rod end 272b, chute 272c, thread trimmer drive source bracket 27e, elastic piece 273, pusher 274, pusher link 275, secondary pusher 276, thread trimmer bracket 277, pusher seat 278, pusher link seat 279, secondary pusher link seat 270, bump 28, table 30, machine head 40, Spindle motor 41, platen 30, controller 60, control panel 61, base 70, wire take-up assembly 80, wire take-up sub-disk 81, wire take-up plate 82, wire take-up column 821, wire slot 822, wire take-up link 83 , Thread gripper one 84, thread gripper 2 85, thread take-up shaft 86, multi-stage cam 1 91, multi-stage cam 2 92, adjustment high point 912, adjustment low point 913.

Detailed ways

The preferred embodiments of the present application will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present application can be more easily understood by those skilled in the art, so that the protection scope of the present application can be more clearly defined. These embodiments It is only used to illustrate the present invention, but not to limit the present invention.

FIG. 1 is a schematic structural diagram of a feed dog assembly of a separable sewing machine according to the present application. The structure of the sewing machine of the present application includes a head 40 , a table 30 and a base 70 . The above-mentioned machine head 40 has an upper thread mechanism 10, a spindle motor 41 and a controller 60. The control panel 61 of the controller 60 is installed on the front of the machine head 40; The lower thread mechanism 20 is two sewing mechanisms independently provided in this sewing machine. The upper thread mechanism 10 is driven by the spindle motor 41 ; the lower thread mechanism 20 has several independent driving sources, and several driving sources work together to complete the lower thread sewing action.

The mechanical transmission mode of the sewing machine is separated up and down, and the upper thread mechanism 10 and the lower thread mechanism 20 have their own running power devices. The feed dog assembly of a separate sewing machine of the present application adopts a mechanical transmission separation structure. The upper thread mechanism 10 basically maintains the structure of the original sewing machine, and the lower thread mechanism 20 has undergone major changes, especially the feed dog assembly 25 and the rotary Shuttle assembly 26 has a subversive change. The sewing machine can realize the sewing operation of the bottom thread by using several micro drive sources, and realize the miniaturization and modular manufacturing of the bottom thread mechanism 20, which is suitable for the installation and use of various types of sewing machines, so that the sewing machine has a simplified mechanical transmission structure, and the machine The transmission structure does not need to provide a lubrication system during operation.

2 and 3 are schematic structural diagrams of the lower thread mechanism 20 of the feed dog assembly of a separate sewing machine according to the present application. The lower thread mechanism 20 has a feed dog assembly 25 , a hook assembly 26 and a thread trimmer assembly 27 . The lower thread mechanism 20 is installed on the side of the platen 30 close to the upper thread mechanism 10 .

In FIGS. 2 , 3 , 4 and 5 , the feeding dog assembly 25 of the present application has an up-down elevating motor 252 and a front and rear feeding motor 253 , which are realized by outputting a swing source at the same time and in coordination with the up and down elevating motor 252 and the front and rear feeding motors 253 . Feeding action of the feed dog. The above two swing driving sources implement non-lateral transmission of the swing source to the cloth dog 251 to realize the feeding action of the cloth dog, while the cloth feeding action of the existing sewing machine is realized by receiving the swing source from the two sides of the cloth dog. This is a significant feature that distinguishes the wobble source of the present application from the prior art. The two oscillating driving sources provided in the present application indirectly act on the feeding dog 251 to realize the feeding action. The specific implementation of the feeding dog assembly 25 includes a vertical lifting motor 252, a front and rear feeding motor 253, a support frame 255, and a feeding dog connecting frame. 254, the bracket 250, the driving tooth-lifting cam one 256 and the tooth-lifting cam two 257, etc. The output shafts at both ends of the up-down lift motor 252 are provided with a driving tooth-lifting cam 1 256 and a tooth-lifting cam 2 257 .

The above-mentioned up-down lift motor 252 is fixed on the bottom plate 211 of the fixed seat 21 . Both ends of the up and down lift motor 252 are provided with a driving tooth-lifting cam 256 and a tooth-lifting cam 257 arranged on both sides of the fixed seat 21 . The first tooth-lifting cam 256 and the second tooth-lifting cam 257 act on the two projections 28 on both sides of the bottom of the support frame 255 respectively. The front and rear sides of the above-mentioned support frame 255 are respectively provided with support rods 25c, and there are brackets 250 fixed on the bottom plate 211. The brackets 250 are located at the front and rear of the up and down lift motor 252, and the top of the bracket 250 has a groove 25d for supporting and supporting The rod 25c and the groove 25d hold the entire support frame 255. The up-and-down motor 252 controlled by the controller 60 makes a rotating action to drive the tooth-lifting cam 1 256 and the tooth-lifting cam 2 257 to rotate. Since the driving tooth-lifting cam 1 256 and the tooth-lifting cam 2 257 have the structural characteristics of unequal diameters, the The support frame 255 performs the up-and-down swinging motion to satisfy the feeding dog 251, and at the same time is limited in the groove 25d, so as to realize the driving of the feeding dog 251 to swing up and down.

A back-and-forth swinger is installed on the output shaft of the front and rear cloth feeding motor 253 to realize the forward and backward swinging motion of the cloth feeding dog 251 . The back-and-forth oscillator in this embodiment is specifically: the upper two ends of the support frame 255 are provided with fixed copper sleeves 259 , and the front and rear cloth feeding motors 253 are arranged on the sides of the support frame 255 . The top of the feed dog connecting frame 254 is connected and fixed with the feeding dog 251. The copper sleeve swing rod 25b and the driving end swing rod 25a at both ends of the cloth feed dog connection frame 254 are respectively arranged on the fixed copper sleeves at both ends of the support frame 255. 259 on. The feed dog connecting frame 254 is movably connected to the connecting rod 25f, which is movably connected to the turntable 25e. The front and rear feeding motors 253 controlled by the controller 60 drive the turntable 25e and then drive the connecting rod 25f. The moving connecting rod 25f swings so that the feeding dog connecting frame 254 swings forward and backward to meet the feeding requirements of the feeding dog 251, thereby realizing the feeding dog. The 251 swings back and forth.

Under the control and driving of the controller 60, the forward and backward swinging motions of the front and rear cloth feeding motors 253 and the up and down swinging motions of the up and down lifting motors 252 are transmitted to the cloth feeding dogs 251 through the feeding dog connecting frame 254, and are also limited in the concave It is carried out in the groove 25d to form a cloth feeding dog 251 in a cloth feeding action state, so as to realize the feeding action of the cloth feeding dog 251 of the flat sewing machine.

The above-mentioned fixing base 21 also has and is connected with the fixing base 21 as an integral needle plate 258 , and the feeding dog 251 operates in the needle plate 258 .

The up-and-down swing source from the up-and-down motor 252 controlled by the controller 60 and the back-and-forth swing source from the front and rear cloth feeding motor 253 together indirectly act on the above-mentioned cloth feeding dog 251 to realize the feeding action of the cloth feeding dog 251 of the sewing machine. The above-mentioned up and down lifting motor 252 and front and rear cloth feeding motor 253 are controlled by the controller 60 to realize programmed control in the adjustment of the sewing needle distance, which overcomes the traditional method of adjusting the needle distance of the original sewing machine, and at the same time, realizes the mechanical transmission mechanism of the sewing machine. Separation overcomes the technical defect of the complex mechanical transmission mechanism of the existing sewing machine and the need for lubricating system to run the mechanism, greatly reducing the manufacturing difficulty of the sewing machine, and the sewing machine has epoch-making technical value.

FIG. 6 , FIG. 7 and FIG. 8 show schematic diagrams of the first multi-stage cam 91 and the second multi-stage cam 92 of the feed dog assembly 25 of the present application. The above-mentioned multi-stage cam 1 91 and multi-stage cam 2 92 have the same shape and size, but the multi-stage cam 1 91 and multi-stage cam 2 92 are installed at both ends of the up-down motor 252 at different positions and angles. Both the multi-stage cam 1 91 and the multi-stage cam 2 92 have several adjustment high points 912 that determine the highest position of the feeding dog 251, and have several adjusting low points 913 that determine the lowest position of the feeding dog 251. The above-mentioned adjustment high points 912 There are adjustment low points 913 adjacent to the front and rear. On the output shafts installed at both ends of the up-down lift motor 252, the adjustment high point 912 and the adjustment low point 913 of the multi-stage cam 1 91 and the multi-stage cam 2 92 are installed at both ends of the up-down lift motor 252 by dislocation, that is, the adjustment high point 912 does not correspond to the installation of the adjustment high point 912, and the second is that the adjustment high point 912 corresponds to the adjustment low point 913 to install.

In FIG. 7, the adjustment high point 912 of the multi-stage cam 2 92 abuts on the bump 28, while the multi-stage cam one 91 adjusts the low point 913 against the bump 28. At this time, the up and down lift motor is running. What 252 transmits to the feed dog 251 is the feeding operation in the backward tilted state.

On the contrary, in FIG. 8 , the adjustment low point 913 of the multi-stage cam 92 abuts on the bump 28 , and the adjustment high point 912 of the multi-stage cam 91 abuts on the bump 28 . What the elevating motor 252 transmits to the feeding dog 251 is the feeding operation in the forward tilt state.

In FIGS. 9 and 10 , the hook assembly 26 of the present application has a suspended hook 261 , a hook fixing seat 265 , an anti-slip cover 266 , a thread stand 268 , a lower thread driving motor 262 and a hook 263 . When the sewing machine is sewing, the hook fixing seat 265 is fixed and stationary. A suspension hook 261 is placed inside the hook fixing seat 265, a thread rack 268 is placed inside the suspension hook 261, and an anti-slip cover is provided outside the thread rack 268. The plate 266 is fixedly connected to the hook fixing seat 265, the anti-slip cover plate 266 is used to abut against the suspension hook 261 and/or the thread rack 268, and the anti-slip cover 266 is used to prevent the suspension hook 261 and/or the thread The rack slides out of the hook fixing seat 265 .

The above-mentioned hook 263 is fixedly connected with the hollow rotating shaft 267 of the lower thread driving motor 262. The hollow rotating shaft 267 of the lower thread driving motor 262 is sleeved on the fixing rod 264 with the hook fixing seat 265. The running track of the above-mentioned hook 263 is connected to the fixing rod 264. Concentric, and the fixing rod 264 is arranged concentrically with the wire frame 268 .

Generally speaking, the hollow shaft 267 of the bobbin thread driving motor 262 drives the hook needle 263 to hook the sewing upper thread on the needle 12 and the sewing lower thread of the inner thread holder 268 of the suspension hook 261 to form a hook. Between the suspension hook 261 and the hook fixing base 265 there is a slip line gap and a positioning arrangement, and there is a slip line gap between the suspension hook 261 and the anti-slip cover plate 266 . The rotary hook assembly 26 of the present application cancels the mechanical transmission mechanism of the original sewing machine, and removes the speed change gear and its connecting transmission rod, so that the rotary hook assembly 26 directly uses the lower thread drive motor 262 to facilitate the intelligent control of the controller 60 and greatly reduces the cost of The manufacturing difficulty and manufacturing cost of the sewing machine have high practicability.

11 , 12 and 13 , the thread trimmer assembly 27 of the present application has a lower thread drive motor 262 , a hollow shaft 267 , a thread trimmer drive source 271 , a push knife holder 270 , a thread trimmer push rod 272 , an elastic member 273 , and a main knife 274 , The main pusher connecting rod 275, the secondary knife 276, the thread trimming bracket 277, the main pusher knife holder 278 and the secondary pusher connecting rod 279. The general scheme of the thread trimmer assembly 27 of the present application is: the thread trimmer push rod 272 of the thread trimmer assembly 27 is pushed and displaced by the thread trimmer drive source 271 , and the displaced thread trimmer push rod 272 is driven by the lower thread of the rotary hook assembly 26 The motor 262 rotates and pushes to realize the thread trimming action.

When the sewing is about to end, that is, when the lower thread driving motor 262 runs to the last circle to complete the sewing, the controller 60 starts the above-mentioned thread trimming action. First, the thread trimming drive source 271 is activated to push the thread trimming push rod 272, and then the push block 272a at the front end of the thread trimming push rod 272 reaches the gap 262c of the hollow rotating shaft 267, so that the hollow rotating shaft 267 in operation drives the thread trimming push rod 272 Rotate, and finally the thread trimming push rod 272 pushes each component of the thread trimming assembly 27 to perform the thread trimming action.

The specific embodiment is as follows: the above-mentioned thread trimmer push rod 272 is first pushed by the thread trimmer drive source 271, the thread trimmer drive source 271 is pushed and rotated by the lower thread drive motor 262, and the rotating thread trimmer push rod 272 is driven by the secondary pusher connecting rod 279. and the main pusher link 275 to generate thrust, the secondary pusher link 279 and the main pusher link 275 push the main pusher tool rest 278 and the pusher tool rest 270, and the above-mentioned main pusher tool rest 278 and pusher tool rest 270 are respectively connected to the main tool 274 and push the secondary knife 276, the main knife 274 and the secondary knife 276 are connected to the main knife 274 and the secondary knife 276 is pushed to complete the thread trimming action when the main push knife rest 278 and the push knife rest 270 are pushed toward each other.

The connecting rod end 272 b of the thread trimming push rod 272 is hinged with the main push knife connecting rod 275 , and the secondary push knife connecting rod 279 is hinged with the middle position of the thread trimming push rod 272 . The thread trimming push rod 272 also has a sliding groove 272c in the middle. The sliding groove 272c matches the sliding rod 262a provided on the lower thread driving motor 262 or the thread trimming drive source bracket 27e. An elastic member 273 is also provided between the above-mentioned thread trimming drive source bracket 27e and the thread trimming push rod 272 . After the thread trimming action is completed, the thread trimming drive source 271 is immediately reset to the initial position, and subsequently, the thread trimming push rod 272, the main knife 274, and the secondary knife 276 also return to the initial position to complete a thread trimming action.

The above has introduced a rotary thread trimming action implemented by using the notch 262c of the hollow rotating shaft 267 in operation to drive the push block 272a of the thread trimming push rod 272. Using this method, thread trimming components of different structures can be used to perform the thread trimming action. , this solution is not limited to the above-mentioned trimmer assembly structure.

In FIGS. 14 and 15 , the thread take-up assembly 80 of the feed dog assembly of a separate sewing machine of the present application has a thread take-up sub-disk 81, a thread take-up disk 82, a rotating shaft 86, a thread gripper 84, a thread gripper Two 85 and thread take-up link 83. The thread take-up post 821 is fixed on the eccentric position of the thread take-up disc 82. The thread take-up post 821 has a thread pulling slot 822. , the sewing thread is sleeved on the thread pulling groove 822, the thread take-up disc 82 and the thread take-up post rotate in a circle, and the thread take-up post 821 is taken up or paid off with the change of the position of the sewing thread under the circular operation. The circular rotation of the take-up disc 82 is driven by the thread take-up shaft 86 connected to the take-up sub-disc 81 to transmit power. The rotation of the take-up sub-disc 81 comes from the up and down thrust of the needle bar 11 driven by the spindle motor 41 of the sewing machine, that is, the needle bar. 11 and the take-up sub-disk 81 are connected with a take-up connecting rod 83, and the take-up connecting rod 83 is connected to the eccentric position of the take-up sub-disk 81, and the up and down thrust of the needle bar 11 drives the take-up sub-disk 81 to rotate in an eccentric manner. .

In short, while the spindle motor 41 drives the needle bar 11 to move up and down, the thread take-up link 83 drives the thread take-up sub-disk 81 to rotate in a circle, and the thread-take-up sub-disk 81 transmits the power to the thread take-up plate 82. Finally, the wire take-up column 821 is driven to take up the wire. The thread take-up assembly 80 of the present application has a simple structure, and the thread take-up speed is consistent with the operation of the needle bar 11, so that the thread take-up and pay-off of the sewing upper thread is more accurate, and the intelligent control level of the sewing machine is improved.

The above are only the preferred embodiments of the present application, and are not intended to limit the scope of the patent of the present application. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present application, or directly or indirectly applied in other related technical fields , are similarly included within the scope of patent protection of this application.

Claims

A cloth feed dog assembly of a separable sewing machine is characterized in that the upper and lower lift motors (252) and the front and rear cloth feeding motors (253) of the cloth feed dog assembly (25) respectively apply up and down movements to the cloth feed dog (251) And the front and rear swing source, the up and down lift motor (252) and the front and rear cloth feeding motor (253) indirectly act on the feeding dog (251) to perform the feeding action.
The cloth feed dog assembly of a separable sewing machine according to claim 1, characterized in that a tooth-lifting cam (256) and a tooth-lifting cam two are respectively installed on the output shafts at both ends of the upper and lower lift motors (252). (257), the distal ends of the first tooth-lifting cam (256) and the second tooth-lifting cam (257) are respectively dislocated and act on the two protrusions (28) at the bottom of the support frame (255) of the feeding dog assembly (25).
A cloth feed dog assembly of a separable sewing machine according to claim 1, characterized in that the up-down lift motor (252) is fixed on the bottom plate (211) of the cloth feed dog assembly (25).
A cloth feed dog assembly for a separable sewing machine according to claim 1, characterized in that the front and rear cloth feeding motors (253) drive the turntable (25e) and then drive the connecting rod (25f), and the connecting rod (25f) The connecting rod (25f) is dynamically connected to the eccentric position of the turntable (25e), and the connecting rod (25f) is dynamically connected to the feeding dog connecting frame (254), and the feeding dog (251) is arranged on the feeding dog connecting frame (254).
The cloth feed dog assembly of a separable sewing machine according to claim 4, characterized in that the copper sleeve swing rod (25b) and the drive end swing rod (25a) are provided at both ends of the cloth feed dog connecting frame (254). ) are respectively arranged on the fixed copper sleeves (259) provided at both ends of the support frame (255), the upper part of the feeding dog connecting frame (254) is connected to the feeding dog (251), and the front and rear feeding motors (253) are fixed On the upper part of the support frame (255) that the sewing machine has.
The cloth feed dog assembly of a separable sewing machine according to claim 2, wherein the front and rear sides of the support frame (255) are respectively provided with support rods (25c), and the front and rear positions of the up and down motor (252) A bracket (250) is respectively provided, the top of the bracket (250) has a groove (25d), and the support rod (25c) is rotatably arranged in the groove (25d).
A cloth feed dog assembly for a separable sewing machine according to claim 2, characterized in that, the first tooth-lifting cam (256) and the second tooth-lifting cam (257) are respectively composed of a multi-stage cam one (91) and a multi-stage cam Instead of the second stage cam (92), the multi-stage cam one (91) and the multi-stage cam two (92) both have several adjustment high points (912) and several adjustment low points (913), and the adjustment high point ( 912) and the adjustment low point (913) are installed in dislocation at both ends of the up and down lift motor (252).
A cloth feed dog assembly for a separable sewing machine according to claim 7, characterized in that the adjustment high points (912) of the multi-stage cam one (91) and the multi-stage cam two (92) are in phase with each other before and after. Adjacent has adjustment low (913).