CN209722457U - Cloth feeding dog frame adjustment mechanism and overlock sewing machine - Google Patents

Abstract

The utility model relates to a cloth feeding tooth frame adjustment mechanism, which is used for adjusting the cloth feeding tooth frame in an overlock machine. The cloth feeding tooth frame adjustment mechanism includes an adjustment component and an operation component. The slider is embedded in the feed dog rack and can slide relative to the feed dog rack. The eccentric shaft has a concentric section and an eccentric section connected to the concentric section. The eccentric section of the eccentric shaft passes through the adjustment slider and cooperates with the adjustment slider. ;The operation component includes the electric control element and the synchronous belt connected between the electric control element and the eccentric shaft. The electric control element drives the synchronous belt through electric control to control the rotation of the eccentric shaft and drives the adjustment slider to adjust the inclination angle of the feeding dog frame and height, so that the overlock sewing machine with the feed dog adjustment mechanism can adapt to the sewing of fabrics of different thicknesses.

Description

Cloth feeding dog frame adjustment mechanism and overlock sewing machine

technical field

The utility model relates to the technical field of sewing, in particular to a cloth feeding dog frame adjustment mechanism and an overlock sewing machine.

Background technique

Overlock sewing machine is mainly used for overlock sewing of textiles, and has a wide range of applications in the field of sewing. The feeding process of the overlock sewing machine mainly depends on the reciprocating elliptical motion of the feed dog. The overlock sewing machine continuously lifts and pulls the cloth on the needle plate through the feed dog, so that the cloth to be processed is continuously dragged to the machine. head to complete the entire feeding process. However, the current overlock sewing machine uses a traditional gear structure or a worm gear structure to adjust the feed dog frame. Due to the complex working environment of the overlock sewing machine, there will be external force collisions that will cause rigidity in the adjustment mechanism for adjusting the cloth feed dog frame. Loss of adjustment function due to damage or inaccurate adjustment.

Contents of the invention

Based on this, in order to solve the above problems, it is necessary to provide an improved feeding dog adjustment mechanism.

A cloth feed dog adjustment mechanism, used for adjusting the cloth feed dog in an overlock sewing machine, the cloth feed dog adjustment mechanism includes an adjustment component and an operation component,

The adjustment assembly includes an adjustment slider and an eccentric shaft, the adjustment slider is embedded in the feed dog frame and can slide relative to the cloth feed dog frame, the eccentric shaft has a concentric section and is connected to the The eccentric section of the concentric section, the eccentric section of the eccentric shaft passes through the adjustment slider and is rotatably matched with the adjustment slider;

The operation assembly includes an electric control element and a synchronous belt connected between the electric control element and the eccentric shaft, the operation assembly also includes: a driving wheel and a driven wheel, the output shaft of the electric control element is connected to the driving wheel, The driven wheel is connected with the concentric section of the eccentric shaft, and the driving wheel drives the driven wheel to rotate through the synchronous belt under the drive of the electric control element, so as to control the rotation of the eccentric shaft and drive the adjusting slider to adjust the cloth feeding dog inclination and height.

Further, the side of the synchronous belt in contact with the driving wheel and the driven wheel has a toothed structure, and the synchronous belt meshes with the driving wheel and the driven wheel through the toothed structure.

Further, the timing belt is also installed with a tension member that drives the timing belt to be in a tensioned state.

Further, the adjusting mechanism of the feed dog frame also includes an induction component for detecting the rotation angle of the eccentric shaft.

Further, the eccentric shaft is equipped with a limiting member, the eccentric shaft is installed on the housing of the overlock sewing machine, and the housing is provided with a limiting member for accommodating the limiting member to limit the rotation angle of the eccentric shaft. groove.

Further, the limiting member is strip-shaped, and the limiting groove is set as a fan-shaped groove.

Further, a feed dog is provided on the feed dog, and the feed dog includes an active feed dog and a differential feed dog, and the feed dog includes a The active teeth on the frame and the differential teeth set on the differential feed dog rack, the active cloth feed dog rack and the differential cloth feed dog rack are at different inclination angles, and the relative position of the cloth feed dog rack is changed. high and low.

Further, the adjusting slider is embedded in the sliding groove provided in the length direction of the feed dog frame, and the sliding of the adjusting slider in the sliding groove is used to release the movement of the eccentric shaft on the feeding dog. The motion traction of the tooth frame in the length direction.

The embodiment of the utility model is also an overlock sewing machine, including a cloth feeding dog frame and a cloth feeding dog frame adjusting mechanism connected to the cloth feeding dog frame, characterized in that the cloth feeding dog frame adjusting mechanism is any of the above-mentioned One of the cloth feeding dog frame adjustment mechanisms.

The cloth feeding tooth frame adjustment mechanism provided in the embodiment of the utility model realizes the purpose of adjusting the inclination and height of the cloth feeding tooth frame by setting the electric control element to drive the synchronous belt and driving the eccentric shaft to rotate a certain angle, so that The overlock sewing machine with the cloth feed dog frame adjustment mechanism can adapt to the sewing of cloths of different thicknesses.

Description of drawings

Fig. 1 is a structural schematic diagram of an overlock sewing machine according to an embodiment of the present invention after omitting part of the structure;

Fig. 2 is a schematic structural view of the main shaft in the overlock sewing machine shown in Fig. 1;

Fig. 3 is a structural schematic diagram of the cloth feeding mechanism in the overlock sewing machine shown in Fig. 1;

Fig. 4 is an exploded schematic diagram after omitting part of the structure in Fig. 3;

Fig. 5 is a structural schematic diagram of another viewing angle of the cloth feeding mechanism shown in Fig. 3;

Fig. 6 is a structural schematic diagram of the differential amount adjusting mechanism in the overlock sewing machine shown in Fig. 1;

Fig. 7 is a structural schematic diagram of the cloth feed dog frame adjustment mechanism in the overlock sewing machine shown in Fig. 1;

Fig. 8 is a structural schematic diagram of another perspective of the overlock sewing machine shown in Fig. 1;

Fig. 9 is an exploded schematic diagram of the cloth feeding dog frame adjustment mechanism shown in Fig. 7 after omitting part of the structure;

Fig. 10a is a schematic diagram of the principle when the cloth feed dog is in a normal working state;

Fig. 10b is a schematic diagram of the principle when the cloth feeding tooth frame is in the thick material working state;

Fig. 10c is a schematic diagram of the principle when the cloth feed dog is in the working state of thin material.

Description of main component symbols

The above description of the symbols of the main components will further describe the embodiments of the utility model in detail in combination with the accompanying drawings and specific implementation methods.

Detailed ways

In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific embodiments described here are only used to explain the utility model, and do not limit the protection scope of the utility model.

It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for purposes of illustration only and are not intended to represent the only embodiments.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of this invention. The terminology used herein in the description of the utility model is only for the purpose of describing specific implementations, and is not intended to limit the utility model.

Please refer to FIG. 1 , the overlock sewing machine 100 is mainly used for overlock sewing of textiles, and is widely used in industrial and home sewing, and is an extremely important and precise sewing machine.

As shown in Figure 1, the overlock sewing machine 100 provided by the utility model includes a housing 10, a main shaft 20, a presser foot mechanism (not shown), a cloth feeding mechanism 30 and a machine head (not shown), and the main shaft 20 is arranged on the housing The inside of the body 10 is connected to the cloth feeding mechanism 30 and the machine head. The presser foot mechanism, the cloth feeding mechanism 30 and the machine head are all arranged on the housing 10, and the presser foot mechanism is opposite to the cloth feeding mechanism 30 and arranged near the machine head.

The housing 10 is used to carry the main shaft 20, the presser foot mechanism, the cloth feeding mechanism 30 and the machine head. The main shaft 20 is connected to a power source (not shown), and can drive the presser foot mechanism and the cloth feeding mechanism 30 under the drive of the power source. And machine head operation, the presser foot mechanism is used to press the cloth transported by the cloth feeding mechanism 30 to improve the quality and quality of sewing processing, the cloth feeding mechanism 30 is used to transport the cloth to be processed, and the machine head is used for sewing processing The cloth feeding mechanism 30 conveys to the fabric. The main shaft 20 drives the cloth feeding mechanism 30 to reciprocally transport the cloth, and then the cloth is properly tensioned by the presser foot mechanism, and the machine head can sew the cloth in a good tension state, thereby completing the sewing seam of the overlock sewing machine 100 process.

Of course, in addition to the above-mentioned housing 10, main shaft 20, presser foot mechanism, cloth feeding mechanism 30 and machine head, auxiliary mechanisms such as a thread passing mechanism and a lubricating mechanism will also be set in the overlock sewing machine 100 to realize the sewing of the overlock sewing machine 100 The successful completion of the process will not be repeated here.

As shown in Figure 1, the housing 10 is roughly box-shaped, and it has a complex shape to match the installation and movement of different components in the overlock sewing machine 100. The housing 10 integrates the main shaft 20, presser foot mechanism, cloth feeding mechanism 30 and machine head. Separated from the external environment, the actuator inside the overlock sewing machine 100 can be protected, and the operator can be prevented from accidentally touching the moving parts of the actuator, so as to protect the operating safety of the operator.

The housing 10 is provided with a main shaft hole (not shown) corresponding to the main shaft 20, and the main shaft hole is used for mounting the main shaft 20; The middle part of the side of the casing 10 is concave and forms a working space. The working space provides the active area of the cloth feeding mechanism 30, so that the cloth feeding mechanism 30 can reciprocate in the area of the working space, thereby continuously feeding the cloth for the machine head. . The housing 10 is also provided with a needle plate 11 for sewing cloth. The needle plate 11 is roughly a flat plate, and its upper surface is the cloth bearing surface, that is, the working plane for sewing and seaming operations. The cloth feeding mechanism 30 is in the working space. The inner reciprocating elliptical movement, thereby constantly rising to the top of the working plane or falling below the working plane, the cloth feeding mechanism 30 can drag the cloth during the rising process, and can reset its own position during the descending process, and the cloth feeding mechanism 30 reciprocates Rise and fall, can realize continuous feeding process.

The outer surface of the housing 10 can also be provided with an operation port and a cover (not shown), the cover is rotatably connected to the side of the housing 10 close to the operation port, the rotation of the cover can close or open the operation port, including Part of the adjustment mechanism of the sewing machine 100 is disposed inside the casing 10 and near the operation port. When the cover body opens the operation port, part of the adjustment mechanism can be exposed from the operation port, and when the cover body closes the operation port, the part of the adjustment mechanism is also enclosed in the housing 10 . in this way. When the overlock sewing machine 100 needs to adjust parameters, the operator can turn over and open the cover, so that the internal parameter adjustment component 51 is exposed, and the operator can adjust through the exposed adjustment component 51 . The cover body isolates part of the adjustment mechanism of the overlock sewing machine 100 from the external environment, and can better protect the overlock sewing machine 100 on the basis of meeting adjustment requirements.

As shown in FIG. 2 , the main shaft 20 passes through the main shaft hole opened on the housing 10 , and the main shaft 20 can rotate under the driving of the power source and drive each actuator in the overlock sewing machine 100 to run. The main shaft 20 has a central axis 21, the main shaft 20 can rotate around its own central axis 21, and the position of the central axis 21 is fixed relative to the housing 10, that is, the main shaft 20 rotates around the central axis 21 at a fixed axis.

The main shaft 20 includes an eccentric shaft section 22 arranged eccentrically so as to be connected to the transmission mechanism (not shown in the figure) of the eccentric shaft section 22. The rotation of the main shaft 20 will drive the eccentric shaft section 22 to orbit the central axis 21 eccentrically, and the eccentric shaft section 22 The eccentric orbiting and then transmit the power to each actuator through the transmission mechanism, so as to realize the driving operation of the actuator; the power transmission of multiple eccentric shaft sections 22 on the main shaft 20 also realizes the different functions in the overlock sewing machine 100. Operation and coordination of executive agencies.

The machine head is arranged in the part of the casing 10 opposite to the working space and is set close to the presser foot mechanism. The machine head can rotate under the drive of the main shaft 20, and control the internal machine needle (not shown) and looper through the crank transmission. (not shown in the figure) is actuated so that the machine needle moves up and down in a straight line regularly, and the looper swings back and forth regularly, and the machine head forms stitches through the mutual cooperation of the machine needle and the looper, thereby completing the sewing and seaming operation of textiles .

As shown in Figures 3 to 5, the cloth feeding mechanism 30 includes a cloth feeding dog frame 31, a first transmission assembly 32, a second transmission assembly 33 and a third transmission assembly 34, and the number of the cloth feeding dog frames 31 is two, respectively For the active cloth feeding dog rack 311 and the differential feeding dog rack 312, the first transmission assembly 32 is connected to the active cloth feeding dog rack 311 and the differential feeding dog rack 312, and the first transmission assembly 32 can be driven by the main shaft 20 Rotate to drive the active cloth feeding dog frame 311 and the differential cloth feeding dog frame 312 to reciprocate and linearly move in the first direction; the second transmission assembly 33 is arranged between the first transmission assembly 32 and the differential cloth feeding dog frame 312, the second The second transmission assembly 33 can drive the differential feed dog frame 312 to reciprocate and linearly move in the second direction under the drive of the first transmission assembly 32; the third transmission assembly 34 is arranged between the second transmission assembly 33 and the active cloth feed dog frame 311 Between them, the third transmission assembly 34 can drive the active cloth feeding dog frame 311 to reciprocate and linearly move in the second direction under the drive of the second transmission assembly 33 .

In this embodiment, the first direction is a vertical direction, and the second direction is a horizontal direction perpendicular to the vertical direction. It can be understood that the first direction can also be other directions inclined to the vertical direction, and the second direction can also be other directions inclined to the horizontal direction; the first direction and the second direction can be perpendicular to each other, or can be at other angles. The first direction and the second direction can be correspondingly set according to actual production needs.

Driven by the first transmission assembly 32, the active cloth feeding dog frame 311 reciprocates and linearly moves in the first direction, and drives the second transmission assembly 33 to reciprocate and linearly move in the second direction. The motion superposition on the surface is expressed as a reciprocating circular motion in space.

The motion form of the differential feeding dog frame 312 is similar to that of the active cloth feeding dog frame 311. The differential feeding dog frame 312 is driven by the first transmission assembly 32 to reciprocate linearly in the first direction, and in the third Driven by the transmission assembly 34 , the reciprocating linear motion along the second direction, and the superposition of the motions of the differential feeding dog frame 312 in the two directions are manifested as a reciprocating circular motion in space.

Because the drag stroke of the active cloth feeding dog 311 and the differential cloth feeding dog 312 in the second direction is often greater than the movement stroke of the cloth feeding dog 31 in the first direction, so the active cloth feeding dog 311 The reciprocating circular motion of the differential feeding dog frame 312 has a relatively large stroke in the lateral direction, and a relatively small stroke in the first direction. The active cloth feeding dog frame 311 and the differential feeding dog frame 312 are reciprocating in space. elliptical motion.

The movement of the active cloth feeding tooth frame 311 and the differential cloth feeding tooth frame 312 can drag the cloth after it is higher than the working plane, and the movement after falling into the working plane can reset its dragging position. The active cloth feeding tooth frame 311 and the differential The reciprocating elliptical motion of the dynamic feeding dog frame 312 can cooperate with the actuation of the machine head. The active cloth feeding dog frame 311 and the differential feeding dog frame 312 convey the cloth into the machine head. 311 and the differential feeding dog frame 312 carry out sewing processing on the current cloth section after feeding, and the cloth feeding dog frame 31 continues to drag the next piece of cloth after the machine head finishes processing the current cloth, so as to circulate and realize continuous operation .

The cloth feeding dog frame 31 is provided with a cloth feeding dog 313 for dragging the cloth. The cloth feeding dog 313 can pass through the needle plate 11 under the drive of the reciprocating elliptical motion of the cloth feeding dog frame 31 and connect with the presser foot plate in the presser foot mechanism. In cooperation, the cloth feeding dog 313 presses the cloth by abutting against the presser foot plate and moving in the first direction, and drags the cloth by moving in the second direction. The cloth feeding dog 313 includes the active tooth 3131 arranged on the active cloth feeding dog frame 311 and the differential dog 3132 arranged on the differential cloth feeding dog frame 312. Teeth 3131, the active teeth 3131 have a serrated surface to increase the drag force on the cloth; differential teeth 3132 for dragging the cloth are arranged on the differential feeding tooth frame 312, and the differential teeth 3132 are also provided with serrated teeth. surface to increase the drag on the cloth. The active tooth 3131 and the differential tooth 3132 are spaced apart from each other, and the gap between the active tooth 3131 and the differential tooth 3132 is used to provide a processing space for the machine head on the machine head. 3131 and the cloth in the gap between differential teeth 3132 are processed to complete the sewing operation.

In this embodiment, the movement of the active feed dog frame 311 and the differential feed dog frame 312 in the first direction is relatively synchronous, and the movement in the second direction is asynchronous, so that the overlock sewing machine 100 can obtain better sewing Processing effect. Certainly, the active cloth feeding dog frame 311 and the differential cloth feeding dog frame 312 may also move synchronously.

In order to ensure the stability and reliability of the active cloth feeding dog 311 and the differential feeding dog 312 during the cloth feeding process, the housing 10 is also provided with an active cloth feeding dog 311 and a differential feeding dog The oil baffle plate 314 and the guide rail 315 of the 312 movement, the oil baffle plate 314 is roughly in the shape of a "mouth", the active cloth feeding dog frame 311 and the differential cloth feeding dog frame 312 pass through the center hole of the oil baffle plate 314 and in the center hole operate within the space. It can be understood that in order to ensure the smooth movement of the active cloth feeding dog 311 and the differential feeding dog 312, the diameter of the central hole of the oil baffle 314 and the size and movement of the active cloth feeding dog 311 and the differential feeding dog 312 A match is required. The two sides of the oil baffle 314 are in corresponding contact with the sides of the active cloth feeding rack 311 and the differential feeding rack 312, and the sides of the oil baffle 314 can scrape off the active cloth feeding rack 311 and the differential feeding rack 312 Lubricating oil on the top, to avoid the part where the lubricating oil infiltrates the flow and the fabric is in direct contact, which will cause problems such as fabric contamination.

The guide rail 315 is roughly in the shape of "concave", which is fixedly arranged at the housing 10 and nested in the active cloth feeding dog frame 311 and the differential cloth feeding dog frame 312. The guide rail 315 is used to improve the active cloth feeding dog frame 311 and the differential The stability of the movement of the cloth feeding dog 312 avoids the movement deviation between the active cloth feeding dog 311 and the differential feeding dog 312 .

A plurality of through holes (unlabeled) are also provided on the active cloth feeding dog frame 311 and the differential cloth feeding dog frame 312. The through holes are used for passing oil, which not only facilitates the infiltration of lubricating oil on the cloth feeding dog frame 31, It can also reduce the weight of the active feed dog frame 311 and the differential feed dog frame 312 , which helps to reduce the weight of the overlock sewing machine 100 as a whole.

The end of the active feed dog frame 311 away from the active tooth 3131 and the end of the differential feed dog frame 312 away from the differential tooth 3132 both extend outward and form two parallel extension arms 316, between the two parallel extension arms 316 A sliding groove 319 extending along the length direction of the feed dog frame 31 is formed between them, and two mutually parallel extension arms 316 are provided for adjusting the overall angle of the feed dog frame 31 .

There is a first chute in the shape of a "mouth" in the approximate middle of the active feed dog rack 311 and the differential feed dog rack 312. The first chute 317 is used to cooperate with the first transmission assembly 32 to facilitate the first transmission. The component 32 drives the active cloth feeding dog frame 311 and the differential cloth feeding dog frame 312 to perform reciprocating linear motion in the first direction.

In addition, a second chute 318 is provided on the differential feed dog 312 along the first direction, and the second chute 318 is used for inserting and sliding part of the structure of the second transmission assembly 33 to realize the differential feed dog. 312 reciprocates linearly in a second direction. The active feeding dog frame 311 is also provided with a through hole (not labeled), which is used for the third transmission assembly 34 to be connected and embedded, so as to realize the mutual fixing between the third transmission assembly 34 and the active cloth feeding dog frame 311.

Please refer to FIG. 4 . FIG. 4 is an exploded view of the cloth feeding mechanism 30 . The first transmission assembly 32 is sleeved on the main shaft 20 and connected to the active feeding dog frame 311 and the differential feeding dog frame 312. The first transmission assembly 32 is used to transmit the kinetic energy of the main shaft 20 and drive the active feeding dog frame 311 and the differential feeding dog frame 312. The differential feed dog 312 reciprocates linearly in the first direction.

The first transmission assembly 32 includes a vertical driving slider 321, an eccentric wheel 322, and a feeding connecting rod 323. The vertical driving slider 321 is used to drive the active feeding dog 311 and the differential feeding dog 312 to reciprocate along the first direction. Movement, the eccentric wheel 322 cooperates with the feeding connecting rod 323 to drive the operation of the second transmission assembly 33 .

The vertical driving slider 321 is roughly block-shaped, and a through hole is opened in the approximate center of the vertical driving slider 321 , and the vertical driving slider 321 is sleeved on an eccentric shaft section 22 of the main shaft 20 through the through hole. The vertical drive slider 321 is embedded in the first chute 317 in the center of the "mouth"-shaped cloth feed dog 31, and is in contact with the inner side wall of the cloth feed dog 31. The rotation of the main shaft 20 around its central axis will make the When the eccentric shaft section 22 rotates eccentrically, it also drives the vertical drive slider 321 sleeved on the eccentric shaft section 22 to perform parallel orbiting in the circumferential direction. Since the vertical driving slider 321 is arranged at the first chute 317 provided inside the feed dog frame 31, the vertical driving slider 321 will reciprocally slide along the first chute 317 under the guidance of the first chute 317. , that is, the movement of the vertical drive slider 321 in the second direction is released by the first chute 317 inside the feed dog 31, and the vertical drive slider 321 only drives the feed dog 31 to reciprocate in the first direction. Linear movement, so as to realize the process that the main shaft 20 drives the feed dog frame 31 to reciprocate along the first direction.

The eccentric wheel 322 and the feeding connecting rod 323 are sleeved on the main shaft 20 in sequence, and the eccentric wheel 322 and the feeding connecting rod 323 cooperate with each other to drive the second transmission assembly 33 to move, thereby driving the active cloth feeding dog for the second transmission assembly 33. The reciprocating linear motion of the frame 311 and the differential feed dog frame 312 in the lateral direction provides a power source. Eccentric wheel 322 is fixed on the main shaft 20 and can rotate under the drive of main shaft 20; The eccentric wheel 322 is sleeved on the straight axis section of the main shaft 20. Due to the eccentric setting of the eccentric wheel 322, the rotational drive of the main shaft 20 is shown as the eccentric rotation of the eccentric wheel 322 around the main shaft 20; On the eccentric wheel 322, the driving effect of the eccentric wheel 322 on the feeding connecting rod 323 is expressed as the epicyclic motion of the feeding connecting rod 323, and the eccentric wheel 322 and the feeding connecting rod 323 form a crank rocker mechanism, thereby driving the second transmission assembly 33 to reciprocate swing.

In this embodiment, the first transmission assembly 32 also includes an eccentric cam 324 and a ratchet (not labeled) arranged on the eccentric cam 324. The relative position of the eccentric wheel 322 and the feeding link 323 on the main shaft 20 is determined by the eccentric cam 324 and the ratchet. The pawl is fixed; of course, the eccentric cam 324 and the pawl also have the function of adjusting the actuators in the overlock sewing machine 100, so details are not repeated here.

As shown in FIG. 4 , one end of the second transmission assembly 33 is connected to the feeding link 323 in the first transmission assembly 32 , and the other end is connected to the differential feed dog frame 312 . The second transmission assembly 33 includes a feed shaft 331, a differential feed crank 332, a connecting block 333, a cover plate 334, and a lateral drive slider 335. The feed shaft 331 passes through the differential feed crank 332 and is installed in the casing. 10 , through the bearing of the feeding shaft 331 , the second transmission assembly 33 can be set at the casing 10 in a stable state. Both ends of the cloth feeding shaft 331 are also provided with axle sleeves (not labeled), through which the cloth feeding shaft 331 is fixed on the housing 10 and can rotate under the bearing of the housing 10.

The differential feed crank 332 is roughly "L" shaped, a part of its short side is fixed to the cloth feed shaft 331, the remaining part of the short side is rotatably connected with the feeding connecting rod 323, and the long side stretches into the connecting block 333 and Inside the cavity surrounded by the cover plate 334. The differential feed crank 332 is rotatably connected to the feed link 323 in the first transmission assembly 32 , and the swing of the feed link 323 will drive the differential feed crank 332 to rotate reciprocally. The differential feed crank 332 is also provided with a plurality of through holes on the long side, and the through holes are used for passing oil, so that lubricating oil can better infiltrate the differential feed crank 332 .

The connecting block 333 and the cover plate 334 are mutually fixed, and an opening is formed between the two for the long side of the differential feed crank 332 to stretch into; number), the corresponding positions of the connection block 333 and the cover plate 334 are provided with screw holes (not numbered), and the connection block 333 and the cover plate 334 can be fixed to each other by threaded fasteners.

The lateral driving slider 335 is embedded in the second chute 318 provided along the first direction by the differential feeding dog frame 312. The approximate central position of the lateral driving slider 335 is hollow, and the lateral driving slider 335 is hollow. A part is used for embedding the protrusion on the connecting block 333 , so as to realize the rotational connection between the connecting block 333 and the lateral driving slider 335 .

With the transmission of the first transmission assembly 32 to the second transmission assembly 33, the feeding connecting rod 323 will drive the differential feed crank 332 in the second transmission assembly 33 to swing back and forth under the drive of the main shaft 20, and the differential feed crank 332 and the feed shaft 331 are fixed to each other, and at this time, the differential feed crank 332 and the feed shaft 331 will swing back and forth as a whole. The long end of the differential feed crank 332 extends into the space surrounded by the connection block 333 and the cover plate 334, and the swing of the differential feed crank 332 will drive the connection block 333, the cover plate 334 and the lateral drive slider 335 to also move. Do reciprocating swings.

Since the lateral drive slider 335 can slide in the second chute 318 of the differential feeding dog frame 312, the swing of the lateral drive slider 335 in space is divided into the lateral movement of the lateral drive slider 335 along the second chute. 318 and the reciprocating linear motion of the laterally driven slider 335 in the direction perpendicular to the extension of the second chute 318, since the laterally driven slider 335 is arranged on the differential feeding tooth frame 312, the laterally driven slider The reciprocating linear motion of 335 in the direction perpendicular to the extension of the second chute 318 will drive the differential feed dog frame 312 to reciprocate linearly in the lateral direction perpendicular to the first direction, thereby realizing that the second transmission assembly 33 is driven by the first transmission assembly 32 The process of driving the differential feed dog frame 312 to make a reciprocating linear motion along the side.

Through the opening of the second chute 318, the movement of the lateral driving slider 335 in the first direction is released, and the lateral driving slider 335 will only transmit its own movement along the lateral direction to the differential feeding dog frame 312 . It should be noted that the swing angle of the differential feed crank 332 will be released through the rotational connection between the lateral drive slider 335 and the connecting block 333 , so as to avoid movement interference caused by the differential feed crank 332 being unable to rotate.

As shown in Figure 5, the third transmission assembly 34 includes an active cloth feeding crank 341, a connecting rod 342 and a connecting rod sleeve 343. The active cloth feeding crank 341 is sleeved on the cloth feeding shaft 331 and is rotatably connected with the connecting rod 342, and the connecting rod 342 is arranged between the connecting rod cover 343 and the active cloth feeding crank 341, and one end of the connecting rod 342 is used to embed the connector (not labeled) arranged on the active cloth feeding crank 341, and the other end is used for the connecting rod cover 343 to embed, and the connecting rod The sleeve 343 passes through one end of the connecting rod 342 and is fixed on the active cloth feeding dog frame 311 , so as to realize the interconnection between the third transmission assembly 34 and the active cloth feeding crank 341 .

A chute (not labeled) is opened on the active cloth feeding crank 341, the chute is arc-shaped and extends approximately in the first direction, and a connecting pin (not labeled) for connecting one end of the connecting rod 342 is embedded in the chute, The active cloth feeding crank 341 is connected to the connecting rod 342 through the connecting pin, and the active cloth feeding crank 341 releases the motion component in the first direction through the connecting rod 342, so that the combined motion of the active cloth feeding crank 341 in the vertical and lateral directions will only The lateral movement is transmitted to the active feeding dog frame 311.

Both ends of the connecting rod 342 are provided with through holes. One of the two through holes is used for inserting the connecting rod sleeve 343 , and the other is used for inserting the connecting pin on the active cloth feeding crank 341 . The connecting rod 342 can drive the active cloth feeding dog frame 311 to reciprocate linearly in the lateral direction perpendicular to the first direction under the driving action of the active cloth feeding crank 341 and the connecting action of the connecting rod sleeve 343 .

The feed shaft 331 connects the active feed rack 311 and the differential feed rack 312, so that the motion sources of the active feed rack 311 and the differential feed rack 312 are consistent, and only the second transmission assembly 33 and the differential feed rack 312 need to be adjusted. The initial position or length of each structure in the third transmission assembly 34 makes the active feed dog frame 311 and the differential feed dog frame 312 have different motion trajectories, and are kept flush in the vertical position.

Drive the active cloth feeding dog frame 311 and the differential cloth feeding dog frame 312 to reciprocate in the first direction and lateral direction through the main shaft 20, so that the driving source of the active cloth feeding dog frame 311 and the differential cloth feeding dog frame 312 is the same, which is beneficial Keep the synchronous movement form of the active cloth feeding dog 311 and the differential feeding dog 312, and avoid multiple driving sources respectively driving the active cloth feeding dog 311 and the differential feeding dog 312 to move, resulting in vertical and lateral Problems with out-of-sync movements.

Of course, if the synchronization problem is not considered, the elliptical motions of the active cloth feeding rack 311 and the differential feeding rack 312 can also be driven by multiple driving sources respectively.

As shown in Figure 6, in order to realize the adjustment of the differential amount between the active cloth feeding dog frame 311 and the differential cloth feeding dog frame 312 in the overlock sewing machine 100, a differential amount adjusting mechanism 40 is also arranged in the overlock sewing machine 100, The differential amount adjusting mechanism 40 includes an adjusting rod 41 , a differential crank 42 and a differential connecting piece 43 , one end of the differential connecting piece 43 is pivotally connected to the differential crank 42 , and the other end is connected to the cover plate in the second transmission assembly 33 334 , one end of the differential crank 42 is connected to the adjustment rod 41 , which can adjust the rotation when the adjustment rod 41 swings and drives the differential connecting piece 43 to move. One end of the adjusting rod 41 is fixedly connected to the differential crank 42 , and the adjusting rod 41 adjusts the positional relationship of the differential link 43 by changing its own angle.

The adjustment rod 41 rotates around the connection point between the adjustment rod 41 and the differential crank 42 under the adjustment of the operator, the rotation of the adjustment rod 41 will drive the rotation of the differential crank 42 fixedly connected with it, and the rotation of the differential crank 42 will drag the differential crank 42 to rotate. Moving connecting piece 43 moves. Since the differential connecting piece 43 is rotatably connected to the cover plate 334 in the second transmission assembly 33, the differential connecting piece 43 is driven by the differential crank 42 to perform its own rotation around the cover plate 334 and to be integrated with the cover plate 334 along the chute. slide. Driven by the differential connecting piece 43, the position of the lateral drive slider 335 fixedly connected to the connection block 333 and the cover plate 334 in the second chute 318 changes, thereby changing the initial motion of the lateral drive slider 335. Position, as the decomposition of the actual movement of the lateral drive slider 335 in the lateral direction, the motion state of the differential feed dog 312 will also change, thereby realizing the difference between the active feed dog 311 and the differential feed dog 312 The adjustment of the differential amount between.

In order to further improve the convenience of differential adjustment, the differential adjustment mechanism 40 provided by the utility model also includes an adjustment panel 44 arranged on the outside of the housing 10, and a chute (not labeled) is opened on the adjustment panel 44, and the adjustment rod 41 is fixedly connected with the slide block (unlabeled) that is arranged in the chute, and the slide block is fixedly provided with the adjuster 441, and the operator can adjust the swing position of the adjuster rod 41 by operating the adjuster 441, thereby facilitating the operation of the operator.

Further, the adjustment panel 44 may also be provided with status marks such as a dial, so as to facilitate the visualization and quantitative adjustment of the differential amount.

The differential amount adjustment mechanism 40 provided by the utility model is also provided with a fixed shaft 421 on the differential crank 42. The fixed shaft 421 is fixed inside the housing 10 and is fixedly connected to the adjustment rod 41 through an axial screw 422. . By setting the fixed shaft 421, the differential crank 42 can be stably arranged on the housing 10, and the axial screw 422 can also realize a reliable connection between the differential crank 42 and the adjustment rod 41, which further improves the operation of the overlock sewing machine 100. reliability and stability.

The existing overlock sewing machine 100 can only process fabrics of a specific thickness during the sewing process, and the sewing effect on fabrics in other thickness ranges is very poor. In order to improve the adaptability to fabrics of different thicknesses and improve the flexible manufacturing capability of the whole machine system, the overlock sewing machine 100 is also provided with a feed dog adjustment mechanism 50, please refer to Figures 7 to 9, the cloth feed dog adjustment mechanism 50 Connected to the feed dog frame 31, by adjusting the angle and height of the feed dog frame 31, the feed dog 313 is used to change the feeding state of the cloth of different thickness, so that the cloth is in a proper tension state, thereby improving the sewing of cloth of different thickness Effect.

The feed dog adjustment mechanism 50 is arranged on the side of the housing 10 and is connected to the cloth feed dog 31. The cloth feed dog adjustment mechanism 50 includes an adjustment assembly 51 and an operation assembly 52. One end of the adjustment assembly 51 is connected to the operation assembly 52. The other end is connected to the feed dog frame 31 , and the adjustment assembly 51 is used to adjust the angle of the cloth feed dog frame 31 ; the operation assembly 52 is arranged on the housing 10 and is used to control the adjustment assembly 51 .

Under the control of the operation assembly 52, the adjustment assembly 51 adjusts the inclination angle of the feed dog frame 31 accordingly according to the thickness of the cloth, thereby changing the inclination angle of the feed dog 313 on the cloth feed dog frame 31, and the overall inclination of the cloth feed dog 313 will be Changing its own height, the cloth feeding dog 313 adapts to cloths of different thicknesses through the change of its own height and inclination angle.

The adjustment assembly 51 includes an eccentric shaft 511 and an adjustment slider 512. The eccentric shaft 511 is connected to the operation assembly 52. The adjustment slider 512 is sleeved on the eccentric shaft 511 and embedded in two parallel extension arms on the feed dog 31. At 316 , the eccentric shaft 511 can drive the adjusting slider 512 to move under the driving of the operating assembly 52 , thereby adjusting the angle of the feeding dog 31 .

The eccentric shaft 511 includes a concentric section 5111 and an eccentric section 5112 connected to the concentric section 5111. The concentric section 5111 of the eccentric shaft 511 is fixed on the housing 10, and the eccentric shaft 511 can rotate around the central axis of the concentric section 5111; the center of the eccentric section 5112 The center of the concentric section 5111 is not concentric, and the two are offset by a preset distance, and the eccentric section 5112 can be driven by the concentric section 5111 to revolve.

The adjustment slider 512 is block-shaped, and its interior is hollow and the eccentric section 5112 of the eccentric shaft 511 is sheathed. 5112 is rotationally connected, and the orbiting of the eccentric section 5112 of the eccentric shaft 511 will drive the adjustment slider 512 to orbit in parallel.

Because the adjustment slider 512 is embedded between the two parallel extension arms 316, the adjustment slider 512 can slide on the track formed by the extension arms 316, and the adjustment slider 512 is in the sliding groove 319 formed between the extension arms 316 Sliding can release the movement in the second direction brought by the eccentric shaft 511 , so that the parallel rotation of the adjusting slider 512 will only drive the extension arm 316 to rise or fall in the first direction. The extension arm 316 is arranged on one end of the cloth feeding dog frame 31, and the other end of the cloth feeding dog frame 31 is fixed by the main shaft 20, so the extension arm 316 rises or falls in the first direction, which will drive the cloth feeding dog frame 31 to tilt, and the feeding dog The tilting angle of the tooth frame 31 is determined by the moving distance of the extension arm 316 in the first direction.

In one embodiment of the present utility model, the operating assembly 52 adjusts the rotation angle of the eccentric shaft 511 through electric control, thereby adjusting the cloth feeding dog frame 31 to a preset angle.

Further, the operation assembly 52 includes an electric control element 521 and a transmission assembly 522, the transmission assembly 522 is arranged between the electric control element 521 and the eccentric shaft 511, and the electric control element 521 adjusts the position of the eccentric shaft 511 through the transmission assembly 522 by means of electric control. Deflection angle, thereby adjusting the angle and height of the feeding dog 313.

As shown in Figure 7, the transmission assembly 522 includes a driving wheel 5221 sleeved on the output shaft 5211 of the electric control element 521, a driven wheel 5222 sleeved on the concentric section 5111 of the eccentric shaft 511, and a driving wheel 5221 and a driven wheel 5222 Between the synchronous belt 5223, the driving wheel 5221 is fixedly connected with the output shaft 5211 of the electric control element 521, the driven wheel 5222 is fixedly connected with the concentric section 5111 of the eccentric shaft 511, and the driving wheel 5221 transmits the output shaft of the electric control element 521 through the synchronous belt 5223 The power of 5211 also drives driven wheel 5222 to rotate.

Both the outer circumference of the driving wheel 5221 and the driven wheel 5222 have gear teeth, and the inner side of the synchronous belt 5223 has a tooth structure, so that the synchronous belt 5223 meshes with the driving wheel 5221 and the driven wheel 5222. After the electric control element 521 is energized to generate power, the rotation of the output shaft 5211 of the electric control element 521 will drive the driving wheel 5221 to rotate, and the driven wheel 5222 transmits the rotational power from the driving wheel 5221 through the synchronous belt 5223, and the eccentric shaft fixedly connected with the driven wheel 5222 511 rotate together, the rotation of the eccentric shaft 511 will drive the adjustment slider 512 which is rotationally connected with the eccentric shaft 511 to change its position in the first direction, thereby realizing the adjustment of the angle and height of the feeding dog frame 31.

The power output of the electronic control unit 521 drives the eccentric shaft 511 to rotate a certain preset angle through the transmission mode of the synchronous belt 5223, which can not only effectively and accurately adjust the height and inclination angle of the feeding dog frame 31 and the feeding dog 313, but also further adapt to different thicknesses. The sewing of the cloth and the transmission of the synchronous belt 5223 can effectively prevent the transmission efficiency of the transmission assembly 522 from being affected by accidental collisions, and also reduce the probability of damage to the transmission assembly 522.

Preferably, the synchronous belt 5223 can be a steel wire rope or glass fiber as a strong layer, covered with an endless belt of polyurethane or neoprene. It can be understood that the synchronous belt 5223 can be made of other composite materials, as long as it can maintain a certain strength, The purpose of belt transmission can be realized.

Further, the driving wheel 5221 is provided with a central through hole and the output shaft 5211 of the electric control element 521 is fixed on the electric control element 521 through an interference fit; the driven wheel is fixed on the concentric section 5111 of the eccentric shaft 511 through screw compression, and the driven wheel 5222 Positioning plates (not numbered) extending radially from the driven wheel 5222 are respectively provided on the two side end surfaces of the two sides, and the positioning plates are used to limit the synchronous belt 5223 from accidentally slipping out of the driven wheel 5222 in the axial direction.

Of course, the driving wheel 5221 can also be fixed on the electronic control element 521 by means such as screw fastening, and the driven wheel 5222 can also be fixed on the concentric section 5111 by means other than screw fixing; as long as the fixing method It only needs to realize the reliable connection and linkage among the driving wheel 5221 , the driven wheel 5222 and the synchronous belt 5223 .

In this embodiment, the electric control element 521 is a stepping motor. It can be understood that in other embodiments, the electric control element 521 can also be replaced by other electric drive elements except the stepping motor. As long as the electric drive element can realize electric control.

In one embodiment of the present utility model, the electric control element 521 is screwed on the side of the housing 10 through a fixing seat (not labeled), and the fixing seat and the electric control element 521 are also fixed by threads, so that the electric control element 521 Being fixed on the side of the housing 10 can facilitate the disassembly and adjustment of the electronic control element 521 .

Of course, in other embodiments, the electric control element 521 and the fixing seat, and between the fixing seat and the housing 10 can also be fixed to each other by means of gluing, riveting, etc.; the electric control element 521 can also be fixed to the housing by other structures. 10, the fixing seat can be omitted at this time.

In the normal power-on state, the rotation angle of the eccentric shaft 511 preset by the electronic control element 521 is within a certain range; in the power-off state, the eccentric shaft 511 may deflect at any angle under the action of an external force, so that during calibration, it will It is difficult to judge which direction the electronic control element 521 is facing. Driving the eccentric shaft 511 can restore the calibration of the feed dog 31 to the initial position. The initial position is the position where the feed dog 313 corresponds to the feed dog 31 in FIG. 10a.

For this reason, further, a stopper 5224 is set on the eccentric shaft 511, and the eccentric shaft 511 is installed on the casing 10 of the overlock sewing machine 100 through a through hole (unlabeled), and the casing 10 is provided with the stopper 5224 The matching limiting groove 5225 is used to limit the rotation angle of the eccentric shaft 511 , that is, the eccentric shaft 511 can rotate within a certain range. Preferably, the limiting groove 5225 is arranged near the through hole.

As shown in Figures 7 to 9, in this embodiment, the limiting member 5224 is set as a strip structure, and one end of the limiting member 5224 is fixedly clamped on the concentric section 5111 of the eccentric shaft 511, so that the eccentric shaft 511 can be linked and limited Part 5224, the other end is inserted into the limiting groove 5225, the limiting groove 5225 is opened as a fan-shaped groove, the limiting member 5224 extends along the radial direction of the sector and the angle range that can rotate in the limiting groove 5225 is a fixed value (Figure 8 The rotatable range of the limiting member shown is 0-120°), when the limiting member 5224 touches the side wall of the limiting groove 5225, the further rotation of the eccentric shaft 511 is restricted, that is, the electric control element 521 controls the eccentric shaft 511 The rotatable angle is limited within a certain range.

The limit piece 5224 and the limit groove 5225 are set to limit the rotatable angle range of the eccentric shaft 511. After the overlock sewing machine 100 is powered on again, the eccentric shaft 511 can realize the positioning of the initial position of starting up more quickly, saving the identification and adjustment time.

It can be understood that the shapes of the limiting member 5224 and the limiting slot 5225 may be other mutually cooperating structures, such as a limiting block, as long as the rotation angle of the eccentric shaft 511 can be limited.

Further, the feeding dog frame adjustment mechanism 50 also includes an induction component for detecting the rotation angle of the eccentric shaft 511 . The induction component includes a magnetic piece and a Hall element 5227. The end of the limit piece 5224 inserted into the limit groove 5225 is fixed with a magnetic piece. The Hall element 5227 for changing the position of the magnetic element, preferably, the Hall element 5227 is arranged at a position adjacent to the magnetic element. It can be understood that the magnetic parts and the Hall element 5227 can be arranged relatively, and the positions can be interchanged.

The output shaft 5211 of the electronic control element 521 drives the driving wheel 5221 to rotate. The driving wheel 5221 transmits power to the driven wheel 5222 through the synchronous belt 5223 and drives the eccentric shaft 511 to rotate. Sensing the magnetic field strength at the position of the magnetic part in the limiter 5224 and generating a corresponding induced voltage to judge and correct the position of the magnetic part, that is, to detect and correct the preset rotation angle of the eccentric shaft 511 .

Further, in order to maintain the transmission efficiency of the synchronous belt 5223, a tension member 5226 that drives the synchronous belt 5223 in a tensioned state is also installed on the synchronous belt 5223. Preferably, as shown in FIG. 8, the tension member 5226 is arranged in strips One end of the tension member 5226 is fixed on the housing 10, and the other end is pressed on the outside of the timing belt 5223. The tension member 5226 is used to control the tension of the timing belt 5223.

In this embodiment, as shown in FIG. 9 , since the central axis of the output shaft 5211 of the electric control element 521 and the central axis of the eccentric shaft 511 are parallel to each other, the transmission direction of the synchronous belt 5223 is consistent with the rotational direction of the eccentric shaft 511 . It can be understood that, in other embodiments, when the central axis of the output shaft 5211 of the electric control element 521 and the central axis of the eccentric shaft 511 deflect at other angles, the central axis of the driving wheel 5221 and the central axis of the driven wheel 5222 can also form a For other angles, such as vertical arrangement, the synchronous belt 5223 forms a cross-belt transmission, as long as the electronic control element 521 can be transmitted through the synchronous belt 5223 to control the rotation of the eccentric shaft 511 to a preset angle.

In one embodiment of the present utility model, the adjustment assembly 51 further includes a shaft sleeve 513, the shaft sleeve 513 sleeves the concentric section 5111 of the eccentric shaft 511 and is fixed on the housing 10, the shaft sleeve 513 is used to carry the eccentric shaft 511, providing A stable rotating environment for the eccentric shaft 511 is ensured. The shaft sleeve 513 has the advantages of corrosion resistance and low cost, and is more suitable for low-speed rotating working conditions.

Further, the shaft sleeve 513 is a copper sleeve. It can be understood that, in other embodiments, the bushing can also be made of other materials than copper; the bushing 513 can also be made of a rolling bearing if cost and low-speed rotation requirements are not considered.

In one embodiment of the present utility model, two retaining rings 514 are respectively arranged on both sides of the adjusting slider 512, and the two retaining rings 514 are oppositely arranged on both sides of the adjusting slider 512, and are sequentially sleeved with the adjusting slider 512. Installed on the eccentric section 5112 of the eccentric shaft 511 , the retaining ring 514 is used to fix the position of the adjusting slider 512 on the eccentric shaft 511 to prevent the adjusting slider 512 from shifting out of the sliding groove 319 due to vibration.

Further, the retaining ring 514 is fixed on the eccentric section 5112 of the eccentric shaft 511 by means of screw compression. Of course, the retaining ring 514 can also be fixed on the eccentric shaft 511 by other methods such as glue fixing and riveting, as long as the retaining ring 514 can be firmly fixed on the eccentric section 5112 of the eccentric shaft 511; Components to realize its own position limiting, at this time the retaining ring 514 can be omitted.

The principle that the overlock sewing machine 100 adjusts the angle and height of the dog frame 31 through the dog frame adjusting mechanism 50 to adapt to different thicknesses of cloth will be explained below.

When one end of the feed dog 31 changes in height under the adjustment of the feed dog adjustment mechanism 50, the overall inclination of the feed dog 31 changes, and the change in the overall inclination of the feed dog 31 will change the height of the feed dog 313. The inclination angle of the active tooth 3131 and the differential tooth 3132 changes from being horizontally aligned to being evenly aligned at an oblique angle. Since the active tooth 3131 and the differential tooth 3132 are fed in different elliptical trajectories, the angle between the two is inclined. Changing the height of the machine head will change the sewing effect.

Please refer to Figure 10a to Figure 10c together, Figure 10a is a schematic diagram of the principle when the cloth feed dog 31 is in a normal working state, Figure 10b is a schematic diagram of the principle when the cloth feed dog 31 is in a thick material working state, and Figure 10c is a schematic diagram of the cloth feeding Schematic diagram of the principle when the tooth frame 31 is in the thin material working state. In the figure, the sign S represents the elliptical motion track of the active tooth 3131 and the differential tooth 3132, V represents the cutting angle direction when the active tooth 3131 and the differential tooth 3132 cut out the working plane, and F represents the pairing of the active tooth 3131 and the differential tooth 3132. The stretch direction of the cloth.

(1) When the cloth feeding dog frame 31 is in the normal working state: the cloth feeding dog frame 31 is not tilted, the driving tooth 3131 is level with the differential tooth 3132, and the driving tooth 3131 and the differential tooth 3132 are in contact with the cloth synchronously. The direction of the elastic force F of 3131 and differential teeth 3132 acting on the fabric is the same as the cutting angle direction when the active teeth 3131 and differential teeth 3132 cut out the working plane, both of which are vertical directions. This state is suitable for sewing with normal thickness and moderate hardness fabric.

(2) When the cloth feeding dog frame 31 is in the working state of thick material: the cloth feeding dog frame 31 is tilted so that the height of the active tooth 3131 is lower than the height of the differential tooth 3132. At this time, the active tooth 3131 and the differential tooth 3132 act on the cloth The direction of the elastic force F remains vertical, but the cutting angle direction when the active tooth 3131 and the differential tooth 3132 cut out the working plane no longer maintains the vertical direction, but feeds cloth in an oblique cutting manner;

Since the height of the active tooth 3131 is lower than that of the differential tooth 3132, the differential tooth 3132 rises above the needle plate 11 before the active tooth 3131 and contacts the cloth in advance, the feeding efficiency of the differential tooth 3132 is higher than that of the active tooth 3131 Therefore, when the active tooth 3131 and the differential tooth 3132 are conveying the cloth, the differential tooth 3132 has a certain catch-up effect relative to the active tooth 3131, forming a pushing effect on the cloth, so that thick materials such as multi-layers and stem seams are fed. Smooth, uniform stitch distance, better sewing quality.

(3) When the cloth feeding dog frame 31 is in the working state of thin material: the cloth feeding dog frame 31 is inclined so that the height of the active tooth 3131 is higher than the height of the differential tooth 3132, and at this time the active tooth 3131 and the differential tooth 3132 act on the cloth The direction of the elastic force F still remains vertical, but the cutting angle direction when the active tooth 3131 and the differential tooth 3132 cut out the working plane no longer maintains the vertical direction, and the active tooth 3131 and the differential tooth 3132 are cut obliquely. send cloth;

Since the height of the active tooth 3131 is higher than that of the differential tooth 3132, the active tooth 3131 rises above the needle plate 11 before the differential tooth 3132 and contacts the cloth in advance, so the feeding efficiency of the active tooth 3131 is higher than that of the differential tooth 3132. Therefore, when the active tooth 3131 and the differential tooth 3132 are conveying the cloth, the active tooth 3131 has a certain distance away from the differential tooth 3132, forming a drag effect on the cloth, so that thin materials such as mesh are flat and not wrinkled. Better quality.

The cloth feed dog frame adjustment mechanism 50 provided by the utility model can adjust the inclination and height of the cloth feed dog frame 31, so that the cloth feed dog frame 31 can change the feeding state of the cloth feed dog 313 according to the thickness of different cloth. The overlock sewing machine 100 using the above-mentioned feed dog adjustment mechanism 50 can improve the sewing quality and the flexible manufacturing capability of the whole machine system, and has wide application prospects.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the present utility model, and the description thereof is relatively specific and detailed, but it should not be construed as limiting the patent scope of the invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the scope of protection of the utility model patent should be based on the appended claims.

Claims (9)

1. A cloth feeding dog adjustment mechanism for adjusting the cloth feeding dog in the overlock sewing machine, characterized in that, the cloth feeding dog adjustment mechanism includes an adjustment assembly and an operating assembly, The adjustment assembly includes an adjustment slider and an eccentric shaft, the adjustment slider is embedded in the feed dog frame and can slide relative to the cloth feed dog frame, the eccentric shaft has a concentric section and is connected to the The eccentric section of the concentric section, the eccentric section of the eccentric shaft passes through the adjustment slider and is rotatably matched with the adjustment slider; The operation assembly includes an electric control element and a synchronous belt connected between the electric control element and the eccentric shaft, the operation assembly also includes: a driving wheel and a driven wheel, the output shaft of the electric control element is connected to the driving wheel, The driven wheel is connected with the concentric section of the eccentric shaft, and the driving wheel drives the driven wheel to rotate through the synchronous belt under the drive of the electric control element, so as to control the rotation of the eccentric shaft and drive the adjusting slider to adjust the cloth feeding dog inclination and height. 2. The adjusting mechanism according to claim 1, characterized in that, the side of the synchronous belt in contact with the driving wheel and the driven wheel has a toothed structure, and the synchronous belt is connected with the toothed structure through the toothed structure. The driving wheel and the driven wheel mesh with each other. 3 . The adjusting mechanism of the cloth feed dog according to claim 1 , wherein a tensioning member for driving the timing belt to be in a tensioned state is installed on the timing belt. 4 . 4. The adjusting mechanism of the feeding dog according to claim 1, characterized in that, the adjusting mechanism of the feeding dog further comprises an induction component for detecting the rotation angle of the eccentric shaft. 5. The adjusting mechanism of the dog frame according to claim 1, characterized in that, the eccentric shaft is installed with a limiter, the eccentric shaft is installed on the housing of the overlock sewing machine, and the housing is provided with There is a limiting groove for accommodating the limiting member to limit the rotation angle of the eccentric shaft. 6 . The adjusting mechanism of the feed dog according to claim 5 , wherein the limiting groove is configured as a fan-shaped groove, and the limiting member is strip-shaped and extends radially of the fan. 7 . 7. The adjusting mechanism of the cloth feeding dog according to claim 1, characterized in that, the cloth feeding dog is provided with a cloth feeding dog, and the cloth feeding dog includes an active cloth feeding dog and a differential feeding dog The tooth frame, the cloth feeding dog includes the active tooth set on the active cloth feeding tooth frame and the differential tooth set on the differential feeding tooth frame, the active cloth feeding tooth frame and the differential feeding tooth frame When the cloth dog rack is at different inclination angles, the relative height of the position is changed. 8. The adjusting mechanism of the feed dog according to claim 1, characterized in that, the adjusting slider is embedded in a sliding groove opened in the length direction of the feeding dog, and the adjusting slider is in the The sliding in the sliding groove is used to release the traction of the eccentric shaft on the motion of the feed dog frame in the length direction. 9. An overlock sewing machine, comprising a cloth feed dog and a cloth feed dog adjustment mechanism connected to the cloth feed dog, characterized in that, the cloth feed dog adjustment mechanism is any one of claims 1-8 One of the cloth feeding dog frame adjustment mechanisms.