CN209873291U - Overedger - Google Patents

Abstract

The utility model provides an overlock sewing machine, which comprises a cloth feeding tooth frame and a cloth feeding tooth frame adjustment mechanism connected to the cloth feeding tooth frame. The cloth feeding tooth frame adjustment mechanism includes an adjustment component and an operation component. The eccentric shaft of the tooth frame, the eccentric shaft rotates under the drive of the operating component and adjusts the inclination and height of the cloth feeding tooth frame; the overlock sewing machine includes a sensing component, a driver and a control part, the sensing component is used to sense the rotation angle of the eccentric shaft, the driver It is connected to the eccentric shaft and can drive the rotation of the eccentric shaft. The control part is electrically connected to the driver and can control the operation of the driver. The control part controls the operation of the driver according to the detection result of the induction component. The driver drives the eccentric shaft to rotate to a preset angle and resets the cloth feeding tooth frame. The overlock sewing machine provided by the utility model can detect the rotation angle of the eccentric shaft by setting the induction component, so that the cloth feeding dog frame can be reset to the initial position every time it is turned on or before detection, thereby ensuring the accuracy of subsequent adjustments.

Description

overlock sewing machine

technical field

The utility model relates to the technical field of sewing, in particular to 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. In order to adapt to fabrics of different thicknesses, the inside of the overlock sewing machine is also equipped with a feed dog frame adjustment mechanism to synchronously adjust the inclination and height of the cloth feed dog frame. However, the current overlock sewing machine is still unable to reset the inclination and height of the cloth feed dog, and the inability of the cloth feed dog to reset causes the deviation of the follow-up adjustment amount and reduces the production quality.

Utility model content

In view of this, it is necessary to provide an improved overlock sewing machine capable of resetting the inclination and height of the feed dog frame.

The utility model provides an overlock sewing machine. The overlock sewing machine includes a cloth feeding dog frame and a cloth feeding dog frame adjusting mechanism connected to the cloth feeding dog frame. The cloth feeding dog frame adjusting mechanism includes an adjustment component and an operation Assemblies, the adjustment assembly includes an eccentric shaft connected to the feed dog, the eccentric shaft is driven by the operation assembly to rotate and adjust the inclination and height of the feed dog;

The overlock sewing machine includes an induction component, a driver and a control member. The induction component is used to sense the rotation angle of the eccentric shaft. The driver is connected to the eccentric shaft and can drive the eccentric shaft to rotate. The control The component is electrically connected to the driver and can control the operation of the driver, the control component controls the operation of the driver according to the detection result of the induction component, and the driver drives the eccentric shaft to rotate to a preset angle and reset The cloth feed dog frame.

Further, the inductive component includes a Hall sensor and a magnetic part, the Hall sensor and the magnetic part are arranged opposite to each other, the magnetic part is connected to the eccentric shaft, and the Hall sensor follows the magnetic part through the magnetic part. The movement of the eccentric shaft detects the rotation angle of the eccentric shaft.

Further, the magnetic member is a magnetic steel.

Further, a connecting piece is provided between the eccentric shaft and the magnetic piece, one end of the connecting piece is connected to the eccentric shaft, and the other end carries the magnetic piece.

Further, a groove is opened on the connecting piece, and the magnetic piece is embedded in the groove and arranged corresponding to the Hall sensor.

Further, the overlock sewing machine has a housing, and the housing is provided with a limit groove for accommodating the connecting piece, and the limit groove limits the swing angle of the eccentric shaft by limiting the swing angle of the connecting piece. angle of rotation.

Further, the limiting groove is fan-shaped, and the connecting piece is strip-shaped and extends along the radial direction of the limiting groove.

Further, the adjustment assembly includes an adjustment slider, 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 transmission assembly, and the electric control element controls the rotation of the eccentric shaft under the transmission action of the transmission assembly and drives the adjustment slider to adjust the inclination and height of the feeding dog frame ;

The overlock sewing machine has a control center, which is used to control the operation of each component of the overlock sewing machine.

Further, the driver is the electric control element, and the control part is the control center.

Further, the transmission assembly is one or more of chain transmission, belt transmission, gear transmission, and worm gear transmission.

The overlock sewing machine provided by the utility model can detect the rotation angle of the eccentric shaft by setting the induction component electrically connected with the control member, so that the cloth feeding dog frame can be reset to The initial position, thereby ensuring the accuracy of the subsequent adjustment, the working capacity of the whole machine of the overlock sewing machine is improved, and has a wide application prospect.

Description of drawings

Fig. 1 is the schematic diagram of the structure of the overlock sewing machine provided by the utility model after omitting part of the structure;

Fig. 2 is an exploded schematic view of the overlock sewing machine shown in Fig. 1;

Fig. 3 is a schematic structural view of the overlock sewing machine shown in Fig. 2 after the shell is omitted;

Fig. 4 is a structural schematic diagram of the housing shown in Fig. 1;

Fig. 5 is the structural representation of main shaft shown in Fig. 2;

Fig. 6 is a structural schematic diagram of the presser foot mechanism shown in Fig. 2;

Fig. 7 is a schematic structural view of the cloth feeding mechanism shown in Fig. 2;

Fig. 8 is a structural schematic diagram of the cloth feeding mechanism shown in Fig. 7 under another viewing angle;

Fig. 9 is an exploded schematic diagram of the cloth feeding mechanism shown in Fig. 7;

Fig. 10 is an exploded schematic view of the third transmission assembly in the cloth feeding mechanism shown in Fig. 8;

Fig. 11 is a structural schematic diagram of the differential amount adjusting mechanism in the overlock sewing machine shown in Fig. 2;

Fig. 12 is a schematic diagram of the structure of the cloth feed dog frame adjustment mechanism in the overlock sewing machine shown in Fig. 2 when it cooperates with the cloth feed dog frame;

Fig. 13 is an exploded schematic view of the adjusting mechanism of the cloth feeding dog frame shown in Fig. 12;

Fig. 14 is an exploded schematic view of the cloth feed dog adjustment mechanism shown in Fig. 13 under another viewing angle;

Fig. 15a is a schematic diagram of the principle when the cloth feed dog is in a normal working state;

Fig. 15b is a schematic diagram of the principle when the cloth feeding tooth frame is in the thick material working state;

Fig. 15c is a schematic diagram of the principle when the cloth feed dog is in a thin material working state.

Explanation of main component symbols

The following specific embodiments will further illustrate the utility model in conjunction with the above-mentioned accompanying drawings.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

It should be noted that when a component is said to be "mounted on" another component, it may be directly mounted on another component or there may be an intervening component. When a component is said to be "set on" another component, it may be set directly on the other component or there may be an intervening component at the same time. When a component is said to be "fixed" to another component, it may be directly fixed to the other component or there may be an intervening component at the same time.

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 in the description of the utility model herein is only for the purpose of describing specific embodiments, and is not intended to limit the utility model. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

Please refer to Fig. 1 and Fig. 3, Fig. 1 is a schematic structural view of the overlock sewing machine 100 provided by the present invention after omitting part of the structure, Fig. 2 is an exploded schematic view of the overlock sewing machine 100 shown in Fig. 1, and Fig. 3 is a schematic diagram of the overlock sewing machine shown in Fig. 1 A schematic structural view of the overlock sewing machine 100 omitting the housing 10 . The overlock sewing machine 100 is mainly used for overlock sewing of textiles, and is widely used in industry and household sewing, and is an extremely important and precise sewing machine.

The overlock sewing machine 100 provided by the utility model includes a housing 10, a main shaft 20, a presser foot mechanism 30, a cloth feeding mechanism 40 and a machine head (not shown in the figure), and the main shaft 20 is arranged inside the housing 10 and connected to the cloth feeding mechanism 40 and the machine head, the presser foot mechanism 30, the cloth feeding mechanism 40 and the machine head are all arranged on the housing 10, and the presser foot mechanism 30 is opposite to the cloth feeding mechanism 40 and arranged near the machine head.

The housing 10 is used to carry the main shaft 20, the presser foot mechanism 30, the cloth feeding mechanism 40 and the machine head. The main shaft 20 is connected to a power source (not shown), and can drive the presser foot mechanism 30, cloth feeding The mechanism 40 and the machine head are running, the presser foot mechanism 30 is used to press the cloth transported by the cloth feeding mechanism 40 to improve the quality and quality of sewing processing, the cloth feeding mechanism 40 is used to transport the cloth to be processed, and the machine head is used to feed cloth for sewing The cloth delivered by mechanism 40. The main shaft 20 drives the cloth feeding mechanism 40 to reciprocate the cloth, and then the presser foot mechanism 30 properly tensions the cloth, and the machine head can sew the cloth in a good tension state, thereby completing the sewing lock of the overlock sewing machine 100 side process.

Of course, in addition to the above-mentioned housing 10, main shaft 20, presser foot mechanism 30, cloth feeding mechanism 40 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 overlock sewing. The successful completion of the process will not be repeated here.

Please also refer to FIG. 4 , which is a schematic structural diagram of the housing 10 shown in FIG. 1 . The housing 10 is roughly box-shaped, and has a complex shape to match the installation and movement of different components in the overlock sewing machine 100. The housing 10 separates the main shaft 20, the presser foot mechanism 30, the cloth feeding mechanism 40 and the machine head from the external environment. , can protect the executive mechanism inside the overlock sewing machine, and prevent the operator 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 11 corresponding to the main shaft 20 , and the main shaft hole 11 is used for mounting and fixing the main shaft 20 ; The middle part of the side of the housing 10 is concave and forms a working space 12. The working space 12 provides the active area of the cloth feeding mechanism 40, so that the cloth feeding mechanism 40 can reciprocate in the area of the working space 12, thereby continuously providing head to feed the fabric. The housing 10 is also provided with a needle plate 13 for sewing cloth. The needle plate 13 is roughly a flat plate, and its upper surface is a cloth bearing surface, that is, a working plane 131 for sewing and hemming operations. The cloth feeding mechanism 40 is working The space 12 reciprocates in an elliptical motion, thereby continuously rising above or falling below the working plane 131. The cloth feeding mechanism 40 can drag the cloth during the rising process, and can reset its position during the descending process. The cloth feeding mechanism 40 cycles of rising and falling can realize continuous feeding process.

The outer surface of the housing 10 is also provided with a cover 14, an operation port 15 is formed between the cover 14 and the housing 10, the cover 14 is rotatably connected to the side of the housing 10, the upper surface of the cover 14 is in contact with the working plane 131 flush, the rotation of the cover body 14 can close or open the operation port 15 . Part of the adjustment mechanism of the overlock sewing machine 100 is arranged inside the housing 10 and near the operation port 15. When the cover body 14 opens the operation port 15, part of the adjustment mechanism can be exposed from the operation port 15. When the cover body 14 closes the operation port 15 At this time, part of the adjustment mechanism is also enclosed in the housing 10 .

in this way. When the overlock sewing machine 100 needs parameter adjustment, the operator can overturn and open the cover body 14, so that the internal parameter adjustment assembly is exposed, and the operator can adjust through the exposed adjustment assembly. The cover body 14 isolates part of the adjustment mechanism of the overlock sewing machine 100 from the external environment, and can better protect the overlock sewing machine on the basis of meeting adjustment requirements.

The cross-section of the cover body 14 is roughly "L" shape, and it includes two plates arranged obliquely to each other, named as the first plate 141 and the second plate 142 respectively, the first plate 141 and the second plate 142 are connected to each other, the first The plate surface of the plate 141 is approximately parallel to the upper side of the housing 10, the second plate 142 is approximately parallel to the outer surface of the housing 10, and the end of the first plate 141 away from the needle plate 13 is rotationally connected to the housing 10, so that the cover The body 14 can rotate relative to the casing 10 and open or close the above-mentioned operation port 15 .

The length of the second plate 142 is shorter than that of the first plate 141 , because the length of the second plate 142 is shorter than the length of the first plate 141 , a gap 143 relative to the first plate 141 is formed on the second plate 142 . When the cover 14 is fully opened, one end of the second plate 142 abuts against the outer surface of the housing 10 , and the notch 143 is closed. The notch is used to prevent the rotation of the second plate 142 and prevent the second plate 142 from being unable to rotate due to assembly interference.

Please refer to FIG. 5 together. FIG. 5 is a schematic structural view of the main shaft 20 shown in FIG. 2 . The main shaft 20 passes through the main shaft hole 11 provided on the housing 10 . The various executive agencies in the operation. The main shaft 20 has a central axis X, and the main shaft 20 can rotate around its own central axis X. The position of the central axis X is fixed relative to the housing 10, that is, the main shaft 20 rotates around the central axis X at a fixed axis.

The main shaft 20 includes an eccentric shaft section 21 arranged eccentrically to connect to the transmission mechanism (not shown in the figure) of the eccentric shaft section 21. The rotation of the main shaft 20 will drive the eccentric shaft section 21 to orbit the central axis X eccentrically. The eccentric shaft section 21 The eccentric orbiting of the transmission mechanism transmits the power to each actuator, thereby realizing the driving operation of the actuator; the power transmission of multiple eccentric shaft sections 21 on the main shaft 20 also realizes the different functions in the overlock sewing machine 100. Operation and coordination of executive agencies.

Please also refer to FIG. 6. FIG. 6 is a schematic structural view of the presser foot mechanism 30 shown in FIG. The cloth delivered by the cloth feeding mechanism 40 makes the cloth in a state of moderate tension, thereby improving the quality of the machine head sewing process.

The presser foot mechanism 30 includes a presser foot shaft 31, a presser foot arm 32, a presser foot support 33 and a presser foot plate 34. The presser foot shaft 31 is installed on the housing 10 and can rotate relative to the housing 10. One end of the presser foot shaft 31 is connected to On the presser arm 32 , a presser support 33 is disposed on the other end of the presser arm 32 opposite to the presser shaft 31 , and the presser plate 34 is disposed on the presser support 33 and can rotate relative to the presser support 33 . The presser foot shaft 31 is used to drive the presser foot arm 32 to rotate, thereby adjusting the installation angle of the entire presser foot mechanism 30 ; the presser foot arm 32 is used to support the presser foot support 33 ; the presser foot support 33 is used to support the presser foot plate 34 . The two-axis adjustment of the presser foot plate 34 is realized through the rotation of the presser foot shaft 31 and the rotation of the presser foot plate 34 relative to the presser foot support 33 .

The machine head is arranged in the part opposite to the working space 12 on the housing 10 and is arranged adjacent to the presser foot mechanism 30. The machine head can rotate under the drive of the main shaft 20, and control the inner machine needle (not shown) and The action of the looper (not shown in the figure) makes the needle move 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 needle and the looper, thereby completing the sewing and seaming of textiles Operation.

Please refer to FIG. 7 to FIG. 8 together. FIG. 7 is a schematic structural diagram of the cloth feeding mechanism 40 shown in FIG. 2 , and FIG. 8 is a structural schematic diagram of the cloth feeding mechanism 40 shown in FIG. 7 under another viewing angle. The cloth feeding mechanism 40 includes a cloth feeding dog frame 41, a first transmission assembly 42, a second transmission assembly 43 and a third transmission assembly 44. The number of the cloth feeding dog frames 41 is two, which are respectively the active cloth feeding dog frame 411 and the differential The dynamic feed dog frame 412, the first transmission assembly 42 is connected to the active cloth feed dog frame 411 and the differential cloth feed dog frame 412, the first transmission assembly 42 can rotate under the drive of the main shaft 20 to drive the active cloth feed dog frame 411 And the differential feed dog frame 412 reciprocates linearly in the first direction; the second transmission assembly 43 is arranged between the first transmission assembly 42 and the differential feed dog frame 412, and the second transmission assembly 43 can move in the first transmission Driven by the assembly 42, the differential feed dog frame 412 is driven to reciprocate and linearly move in the second direction; the third transmission assembly 44 is arranged between the second transmission assembly 43 and the active cloth feed dog frame 411, and the third transmission assembly 44 can Driven by the second transmission assembly 43, the active cloth feeding dog frame 411 is driven to reciprocate and linearly move in the second direction.

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 42, the active cloth feeding dog frame 411 reciprocates linearly in the first direction, and is driven by the second transmission assembly 43 to reciprocate linearly in the second direction. The active cloth feeding dog frame 411 moves in two directions. The motion superposition on the surface is expressed as a reciprocating circular motion in space.

The motion form of the differential feeding dog frame 412 is similar to that of the active cloth feeding dog frame 411. The differential feeding dog frame 412 is driven by the first transmission assembly 42 to reciprocate linearly in the first direction, and in the third Driven by the transmission assembly 44, the reciprocating linear motion along the second direction, and the superposition of the motions of the differential feed dog frame 412 in the two directions are manifested as reciprocating circular motions in space.

Since the dragging stroke of the active cloth feeding dog 411 and the differential cloth feeding dog 412 in the second direction is often greater than the movement stroke of the cloth feeding dog 41 in the first direction, so the active cloth feeding dog 411 The reciprocating circular motion of the differential feeding dog frame 412 has a relatively large stroke in the lateral direction, and a relatively small stroke in the first direction. The active cloth feeding dog frame 411 and the differential feeding dog frame 412 are reciprocating in space. elliptical motion.

The movement of the active cloth feeding dog rack 411 and the differential cloth feeding dog rack 412 above the working plane 131 can drag the cloth, and the movement after falling into the working plane 131 can reset its dragging position. The active cloth feeding dog rack 411 The reciprocating elliptical motion of the differential feeding dog frame 412 can cooperate with the movement of the machine head. The active cloth feeding dog frame 411 and the differential cloth feeding dog frame 412 convey the cloth into the machine head. After the frame 411 and the differential feed dog frame 412 are fed, the current cloth section is sewn and processed, and the cloth feed dog frame 41 continues to drag the next section of cloth after the machine head finishes processing the current cloth, so as to circulate and realize continuous sewing. Operation.

The cloth feed dog 41 is provided with a cloth feed dog 413 for dragging the cloth. The cloth feed dog 413 can pass through the needle plate 13 under the drive of the reciprocating elliptical motion of the cloth feed dog 41, and is connected with the presser foot mechanism 30. The foot plate 34 cooperates, and the cloth feeding dog 413 presses the cloth by abutting against the presser foot plate 34 and moving in the first direction, and drags the cloth by moving in the second direction. The cloth feed dog 413 includes the active tooth 4131 arranged on the active cloth feed dog frame 411 and the differential tooth 4132 arranged on the differential cloth feed dog frame 412. Teeth 4131, the active teeth 4131 have a serrated surface to increase the drag force on the cloth; differential teeth 4132 for dragging the cloth are arranged on the differential feeding tooth frame 412, and the differential teeth 4132 are also provided with serrated teeth. surface to increase the drag on the cloth. The active tooth 4131 and the differential tooth 4132 are spaced apart from each other, and the gap between the active tooth 4131 and the differential tooth 4132 is used to provide a processing space for the machine head on the machine head. 4131 and the cloth of differential tooth 4132 gap are processed, thereby finish sewing operation.

In this embodiment, the movement of the active feed dog frame 411 and the differential feed dog frame 412 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 411 and the differential cloth feeding dog frame 412 may also move synchronously.

In order to ensure the stability and reliability of the active cloth feeding dog 411 and the differential feeding dog 412 during the cloth feeding process, the housing 10 is also provided with an active cloth feeding dog 411 and a differential feeding dog. The oil baffle plate 414 and the guide rail 415 that move at 412, the oil baffle plate 414 is roughly in the shape of a "mouth", the active cloth feeding dog frame 411 and the differential cloth feeding dog frame 412 pass through the center hole of the oil baffle plate 414 and are in the center hole action in the space. It can be understood that in order to ensure the smooth movement of the active cloth feeding dog 411 and the differential feeding dog 412, the diameter of the central hole of the oil baffle 414 and the size and movement of the active cloth feeding dog 411 and the differential feeding dog 412 A match is required. The two sides of the oil baffle 414 are in corresponding contact with the sides of the active cloth feeding rack 411 and the differential feeding rack 412, and the sides of the oil baffle 414 can scrape off the active cloth feeding rack 411 and the differential feeding rack 412 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 415 is roughly in the shape of "concave", which is fixedly arranged at the housing 10 and nested in the active cloth feeding dog frame 411 and the differential cloth feeding dog frame 412. The guide rail 415 is used to improve the active cloth feeding dog frame 411 and the differential The stability of the movement of the cloth feeding dog 412 avoids the movement deviation between the active cloth feeding dog 411 and the differential feeding dog 412 .

There are also multiple through holes (unlabeled) on the active cloth feeding dog frame 411 and the differential cloth feeding dog frame 412. The through holes are used for passing oil, which not only facilitates the infiltration of lubricating oil on the cloth feeding dog frame 41, It can also reduce the weight of the active feed dog frame 411 and the differential feed dog frame 412 , which helps to reduce the weight of the overlock sewing machine 100 as a whole.

The end of the active feed dog frame 411 away from the active tooth 4131 and the end of the differential feed dog frame 412 away from the differential tooth 4132 both extend outward and form two parallel extension arms 416, between the two parallel extension arms 416 A sliding groove 418 extending along the length direction of the feed dog 41 is formed between them, and two mutually parallel extension arms 416 are provided for adjusting the overall angle of the feed dog 41 .

The approximate middle of the active feed dog frame 411 and the differential feed dog frame 412 is provided with a "mouth"-shaped chute (not labeled), which is used to cooperate with the first transmission assembly 42, so that the first transmission assembly 42 Drive the active cloth feeding dog frame 411 and the differential cloth feeding dog frame 412 to perform reciprocating linear motion in the first direction.

In addition, the differential feed dog frame 412 is also provided with a chute 417 along the first direction, and the chute 417 is used for the partial structure of the second transmission assembly 43 to embed and slide, so as to realize the differential feed dog frame 412 in the second direction. Reciprocating linear motion in the direction. The active feeding dog frame 411 is also provided with a through hole (not labeled), which is used for connecting and inserting the third transmission assembly 44 , so as to realize the mutual fixing between the third transmission assembly 44 and the active cloth feeding dog frame 411 .

Please also refer to FIG. 9 . FIG. 9 is an exploded view of the cloth feeding mechanism 40 shown in FIG. 7 . The first transmission assembly 42 is sleeved on the main shaft 20 and connected to the active feed dog frame 411 and the differential feed dog frame 412. The first transmission assembly 42 is used to transmit the kinetic energy of the main shaft 20 and drive the active cloth feed dog frame 411 and the differential feed dog frame 412. The differential feed dog 412 reciprocates linearly in the first direction.

The first transmission assembly 42 includes a vertical driving slider 421, an eccentric wheel 422, and a feeding connecting rod 423. The vertical driving slider 421 is used to drive the active feeding dog 411 and the differential feeding dog 412 to reciprocate along the first direction. Movement, the eccentric wheel 422 cooperates with the feeding connecting rod 423 to drive the operation of the second transmission assembly 43 .

The vertical driving slider 421 is roughly block-shaped, and a through hole is opened in the approximate center of the vertical driving slider 421 , and the vertical driving slider 421 is sleeved on an eccentric shaft section 21 of the main shaft 20 through the through hole. The vertical drive slider 421 is embedded in the center chute of the "mouth"-shaped cloth feed dog 41, and is in contact with the inner side wall of the cloth feed dog 41. The rotation of the main shaft 20 around its central axis will make the eccentric shaft section 21 rotates eccentrically, which also drives the vertical drive slider 421 sleeved on the eccentric shaft section 21 to perform parallel orbiting in the circumferential direction. Since the vertical driving slider 421 is arranged at the chute provided inside the cloth feed dog frame 41, the vertical driving slider 421 will slide back and forth along the chute under the guidance of the chute, that is, the vertical driving slider 421 The movement in the side direction is released by the chute inside the feed dog 41, and the vertical drive slider 421 only drives the feed dog 41 to reciprocate linearly in the first direction, so that the main shaft 20 drives the cloth feed dog 41 The process of reciprocating motion in a first direction.

The eccentric wheel 422 and the feeding connecting rod 423 are sleeved on the main shaft 20 in sequence, and the eccentric wheel 422 and the feeding connecting rod 423 cooperate with each other to drive the second transmission assembly 43 to move, thereby driving the active cloth feeding dog for the second transmission assembly 43 The reciprocating linear motion of the frame 411 and the differential feed dog frame 412 in the lateral direction provides a power source. Eccentric wheel 422 is fixed on the main shaft 20 and can rotate under the drive of main shaft 20; The eccentric wheel 22 (unlabeled) is sleeved on the straight shaft section of the main shaft 20. Due to the eccentric setting of the eccentric wheel 22, the rotational drive of the main shaft 20 is shown as the eccentric rotation of the eccentric wheel 22 around the main shaft 20; 423 is set on the eccentric wheel 22, and the driving effect of the eccentric wheel 22 on the feeding connecting rod 423 is shown as the turnover movement of the feeding connecting rod 423. The eccentric wheel 22 and the feeding connecting rod 423 form a crank rocker mechanism, thereby driving the second transmission Assembly 43 swings back and forth.

In this embodiment, the first transmission assembly 42 also includes an eccentric cam 424 and a ratchet (not labeled) arranged on the eccentric cam 424. The relative position of the eccentric wheel 22 and the feeding link 423 on the main shaft 20 is determined by the eccentric cam 424 and the ratchet. The pawl is fixed; of course, the eccentric cam 424 and the pawl also have the function of adjusting the actuators in the overlock sewing machine 100, and details will not be described here.

Please refer to FIG. 7 and FIG. 8 again, one end of the second transmission assembly 43 is connected to the feeding link 423 in the first transmission assembly 42 , and the other end is connected to the differential feed dog frame 412 . The second transmission assembly 43 includes a feed shaft 431, a differential feed crank 432, a connecting block 433, a cover plate 434, and a lateral drive slider 435. The feed shaft 431 passes through the differential feed crank 432 and is installed in the casing. 10 , through the bearing of the feeding shaft 431 , the second transmission assembly 43 can be set at the casing 10 in a stable state. The two ends of the cloth feeding shaft 431 are also provided with shaft sleeves (not labeled), through which the cloth feeding shaft 431 is fixed on the housing 10 and can rotate under the bearing of the housing 10 .

The differential feed crank 432 is roughly in the shape of an "L", a part of its short side is fixed to the feed shaft 431, the remaining part of the short side is connected to the feed connecting rod 423 in rotation, and the long side stretches into the connecting block 433 and Inside the cavity surrounded by the cover plate 434. The differential feed crank 432 is rotatably connected to the feed link 423 in the first transmission assembly 42 , and the swing of the feed link 423 will drive the differential feed crank 432 to rotate reciprocally. The differential feed crank 432 also has 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 432 .

The connecting block 433 and the cover plate 434 are mutually fixed, and an opening for the long side of the differential feeding crank 432 is enclosed between the two; number), the corresponding positions of the connection block 433 and the cover plate 434 are provided with screw holes (not numbered), and the connection block 433 and the cover plate 434 can be fixed to each other by threaded fasteners.

The lateral driving slider 435 is embedded in the chute 417 provided by the differential feeding dog frame 412 along the first direction, the approximate center of the lateral driving slider 435 is hollow, and the hollow part of the lateral driving slider 435 is used for The protrusions on the connecting block 433 are embedded to realize the rotational connection between the connecting block 433 and the lateral driving slider 435 .

With the transmission of the first transmission assembly 42 to the second transmission assembly 43, the feed link 423 will drive the differential feed crank 432 in the second transmission assembly 43 to swing back and forth under the drive of the main shaft 20, and the differential feed crank 432 and the feed shaft 431 are fixed to each other, and at this time, the differential feed crank 432 and the feed shaft 431 will swing back and forth as a whole. The long end of the differential feed crank 432 extends into the space surrounded by the connecting block 433 and the cover plate 434, and the swing of the differential feed crank 432 will drive the connecting block 433, the cover plate 434 and the lateral drive slider 435 to Do reciprocating swings.

Since the lateral driving slider 435 can slide in the chute 417 of the differential feeding tooth frame 412, the swing of the lateral driving slider 435 in space is respectively caused by the reciprocating sliding of the lateral driving slider 435 along the chute 417. And the reciprocating linear motion of the lateral drive slider 435 on the extension direction of the vertical chute 417, since the lateral drive slider 435 is arranged on the differential feed dog frame 412, the lateral drive slider 435 will move in the vertical chute 417 The reciprocating linear motion in the extension direction will drive the differential feed dog frame 412 to reciprocate and linearly move laterally perpendicular to the first direction, so that the second transmission assembly 43 drives the differential feed tooth frame 412 driven by the first transmission assembly 42 The process of reciprocating linear motion along the side.

Through the opening of the chute 417 , the movement of the lateral driving slider 435 in the first direction is released, and the lateral driving slider 435 only transmits its own movement along the lateral direction to the differential feeding dog frame 412 . It should be noted that the swing angle of the differential feed crank 432 will be released through the rotational connection between the lateral drive slider 435 and the connecting block 433 , so as to avoid movement interference caused by the differential feed crank 432 being unable to rotate.

Please also refer to FIG. 10 . FIG. 10 is an exploded view of the third transmission assembly 44 in the cloth feeding mechanism 40 shown in FIG. 8 . The third transmission assembly 44 includes an active cloth feeding crank 441, a connecting rod 442 and a connecting rod sleeve 443. The active cloth feeding crank 441 is sleeved on the cloth feeding shaft 431 and is rotatably connected with the connecting rod 442. The connecting rod 442 is arranged on the connecting rod sleeve. Between 443 and the active cloth feed crank 441, one end of the connecting rod 442 is embedded for a connecting piece (not labeled) arranged on the active cloth feed crank 441, and the other end is embedded for the connecting rod sleeve 443, and the connecting rod sleeve 443 wears the connecting rod 442 and is fixed on the active cloth feeding tooth frame 411, so as to realize the mutual connection between the third transmission assembly 44 and the active cloth feeding crank 441.

A chute (not labeled) is opened on the active cloth feeding crank 441, the chute is arc-shaped and extends roughly in the first direction, and a connecting pin (not labeled) for connecting one end of the connecting rod 442 is embedded in the chute, The active cloth feeding crank 441 is connected to the connecting rod 442 through the connecting pin, and the active cloth feeding crank 441 releases the motion component in the first direction through the connecting rod 442, so that the synthetic motion of the active cloth feeding crank 441 in the vertical and lateral directions will only The lateral movement is transmitted to the active feeding dog frame 411.

Both ends of the connecting rod 442 are provided with through holes. One of the two through holes is used for the insertion of the connecting rod sleeve 443 , and the other is used for the insertion of the connecting pin on the active cloth feeding crank 441 . The connecting rod 442 can drive the active cloth feeding dog frame 411 to reciprocate linearly in the lateral direction perpendicular to the first direction under the driving action of the active cloth feeding crank 441 and the connecting action of the connecting rod sleeve 443 .

The feed shaft 431 is connected to the active feed rack 411 and the differential feed rack 412, so that the motion sources of the active feed rack 411 and the differential feed rack 412 are consistent, and only the second transmission assembly 43 and the differential feed rack 412 need to be adjusted. The initial position or length of each structure in the third transmission assembly 44 makes the active feeding dog frame 411 and the differential feeding dog frame 412 have different motion trajectories, and they are kept flush in the vertical position.

Drive the active cloth feeding dog frame 411 and the differential cloth feeding dog frame 412 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 411 and the differential cloth feeding dog frame 412 is the same, which is beneficial Keep the synchronization of the active cloth feeding dog frame 411 and the differential cloth feeding dog frame 412 to avoid the occurrence of multiple driving sources respectively driving the active cloth feeding dog frame 411 and the differential cloth feeding dog frame 412 to move, resulting in vertical and lateral Problems with out-of-sync movement.

Of course, if the synchronization problem is not considered, the elliptical motions of the active cloth feeding dog 411 and the differential feeding dog 412 can also be driven by multiple driving sources respectively.

Please also refer to FIG. 11 . FIG. 11 is a schematic structural diagram of the differential adjustment mechanism 50 in the overlock sewing machine 100 shown in FIG. 2 . In order to realize the adjustment of the differential amount between the active cloth feeding dog frame 411 and the differential cloth feeding dog frame 412 in the overlock sewing machine 100, the overlock sewing machine 100 is also provided with a differential amount adjusting mechanism 50, a differential amount adjusting mechanism 50 It includes an adjustment rod 51, a differential crank 52, and a differential connecting piece 53. One end of the differential connecting piece 53 is pivotally connected to the differential crank 52, and the other end is connected to the cover plate 434 in the second transmission assembly 43. The differential crank 52 One end is connected to the adjusting rod 51, which can adjust the rotation when the adjusting rod 51 swings and drives the differential link 53 to move. One end of the adjusting rod 51 is fixedly connected to the differential crank 52 , and the adjusting rod 51 adjusts the positional relationship of the differential connecting piece 53 by changing its own angle.

The adjustment rod 51 rotates around the connection point between the adjustment rod 51 and the differential crank 52 under the adjustment of the operator, the rotation of the adjustment rod 51 will drive the rotation of the differential crank 52 fixedly connected with it, and the rotation of the differential crank 52 will drag the differential crank 52 to rotate. Moving connecting piece 53 moves. Since the differential connecting piece 53 is rotationally connected with the cover plate 434 in the second transmission assembly 43, the differential connecting piece 53 is driven by the differential crank 52 to perform its own rotation around the cover plate 434 and along with the cover plate 434 along the chute 417. Overall sliding. Driven by the differential connecting piece 53, the position of the lateral driving slider 435 fixedly connected to the connection block 433 and the cover plate 434 in the chute 417 changes, thereby changing the initial position of the lateral driving slider 435, As the decomposition of the actual movement of the lateral drive slider 435 in the lateral direction, the motion state of the differential feed dog 412 also changes, thereby realizing the difference between the active feed dog 411 and the differential feed dog 412. Momentum regulation.

In order to further improve the convenience of adjusting the differential amount, the differential amount adjusting mechanism 50 provided by the utility model also includes an adjusting panel 54 arranged on the outside of the housing 10. The adjusting panel 54 is provided with a chute (not labeled), and the adjusting rod 51 is fixedly connected with a slide block (not numbered) arranged in the chute, and an adjustment member 541 is fixed on the slide block. The operator can adjust the swing position of the adjustment rod 51 by operating the adjustment member 541, thereby facilitating the operation of the operator.

Further, the adjustment panel 54 may also be provided with status signs such as a dial, so as to facilitate the visualization and quantitative adjustment of the differential amount.

The differential amount adjustment mechanism 50 provided by the utility model is also provided with a fixed shaft 521 on the differential crank 52. The fixed shaft 521 is fixed inside the housing 10 and is fixedly connected to the adjustment rod 51 through a shaft screw 522. . By setting the fixed shaft 521, the differential crank 52 can be stably arranged on the housing 10, and the axial screw 522 can also realize a reliable connection between the differential crank 52 and the adjusting rod 51, which further improves the operation of the overlock sewing machine 100. reliability and stability.

Please refer to Fig. 12 to Fig. 14 together. Fig. 12 is a schematic diagram of the structure of the cloth feed dog frame adjustment mechanism 60 in the overlock sewing machine 100 shown in Fig. 2 when it cooperates with the cloth feed dog frame 41. An exploded schematic view of the dog frame adjusting mechanism 60 , and FIG. 14 is an exploded schematic view of the cloth feeding dog frame adjusting mechanism 60 shown in FIG. 13 from another perspective.

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 frame adjustment mechanism 60, which is connected to the cloth feed dog frame 41, By adjusting the angle and height of the feed dog frame 41, the feed dog 413 is used to change the feeding state of the cloth with different thickness, so that the cloth is in a proper tension state, thereby improving the sewing effect of the cloth with different thickness.

The feed dog adjustment mechanism 60 is arranged on the side of the housing 10 and connected to the cloth feed dog 41. The cloth feed dog adjustment mechanism 60 includes an adjustment assembly 61 and an operation assembly 62. One end of the adjustment assembly 61 is connected to the operation assembly 62. The other end is connected to the feed dog frame 41 , and the adjustment assembly 61 is used to adjust the angle of the cloth feed dog frame 41 ; the operation assembly 62 is arranged on the housing 10 and is used to control the adjustment assembly 61 .

Under the control of the operation assembly 62, the adjustment assembly 61 adjusts the inclination angle of the feed dog frame 41 accordingly according to the thickness of the cloth, thereby changing the inclination angle of the feed dog 413 on the cloth feed dog frame 41, and the overall inclination of the cloth feed dog 413 will be Changing its own height, the cloth feeding dog 413 adapts to cloths of different thicknesses through the change of its own height and inclination angle.

The adjustment assembly 61 includes an eccentric shaft 611 and an adjustment slider 612. The eccentric shaft 611 is connected to the operation assembly 62. The adjustment slider 612 is sleeved on the eccentric shaft 611 and embedded in two parallel extension arms on the feed dog 41. At 416 , the eccentric shaft 611 can drive the adjusting slider 612 to move under the driving of the operating assembly 62 , so as to adjust the angle of the feeding dog 41 .

The eccentric shaft 611 includes a concentric section 6111 and an eccentric section 6112 connected to the concentric section 6111. The concentric section 6111 of the eccentric shaft 611 is fixed on the housing 10, and the eccentric shaft 611 can rotate around the central axis of the concentric section 6111; the center of the eccentric section 6112 The center of the concentric section 6111 is not concentric, and the two are offset by a preset distance, and the eccentric section 6112 can be driven by the concentric section 6111 to revolve.

The adjustment slider 612 is block-shaped, and its interior is hollow and the eccentric section 6112 of the eccentric shaft 611 is sheathed. The adjustment slider 612 is embedded between the two parallel extension arms 416. 6112 is rotationally connected, and the orbiting of the eccentric section 6112 of the eccentric shaft 611 will drive the adjustment slider 612 to orbit in parallel.

Because the adjustment slider 612 is embedded between the two parallel extension arms 416, the adjustment slider 612 can slide on the track formed by the extension arms 416, and the adjustment slider 612 is in the sliding groove 319 formed between the extension arms 416 Sliding can release the movement in the second direction brought by the eccentric shaft 611 , so that the parallel rotation of the adjusting slider 612 will only drive the extension arm 416 to rise or fall in the first direction. The extension arm 416 is arranged on one end of the cloth feed dog frame 41, and the other end of the cloth feed dog frame 41 is fixed by the main shaft 20, so the extension arm 416 will drive the cloth feed dog frame 41 to tilt when the extension arm 416 rises or falls in the first direction. The tilting angle of the tooth frame 41 is determined by the moving distance of the extension arm 416 in the first direction.

In one embodiment of the present utility model, the operating assembly 62 adjusts the rotation angle of the eccentric shaft 611 through electric control, thereby adjusting the cloth feeding dog frame 41 to a preset angle.

Further, the operation assembly 62 includes an electric control element 621 and a transmission assembly 622, the transmission assembly 622 is arranged between the electric control element 621 and the eccentric shaft 611, and the electric control element 621 adjusts the position of the eccentric shaft 611 through the transmission assembly 622 through electric control. The deflection angle, thereby adjusting the angle and height of the feeding dog 413.

In this embodiment, the transmission assembly 622 transmits the power output by the electric control element 621 to the adjustment assembly 61 in a belt transmission manner.

Specifically, the transmission assembly 622 includes a driving wheel 6221, a driven wheel 6222 and a timing belt 6223. The driving wheel 6221 is sleeved on the output shaft 6211 of the electric control element 621, the driven wheel 6222 is sleeved on the concentric section 6111 of the eccentric shaft 611, and the timing belt 6223 is arranged between the driving wheel 6221 and the driven wheel 6222. The driving wheel 6221 is fixedly connected to the output shaft 6211 of the electric control element 621, and the driven wheel 6222 is fixedly connected to the concentric section 6111 of the eccentric shaft 611. The driving wheel 6221 transmits the power of the output shaft 6211 of the electric control element 621 through the synchronous belt 6223 and drives the driven wheel 6222 turns.

In this embodiment, the driven wheel 6222 is provided with a threaded fixing part 6224, and the threaded fixing part 6224 is threaded through the center of the driven wheel 6222 and then screwed to the concentric section 6113 of the eccentric shaft 611, thereby realizing the connection between the driven wheel 6222 and the eccentric shaft 611. mutually fixed.

It can be understood that in other embodiments, the driven wheel 6222 can also be fixed to the eccentric shaft 611 in other ways, and the threaded fixing member 6224 can be omitted at this time.

The outer periphery of the driving wheel 6221 and the driven wheel 6222 have gear teeth, and the inside of the synchronous belt 6223 has a tooth structure, so that the synchronous belt 6223 meshes with the driving wheel 6221 and the driven wheel 6222. After the electric control element 621 is energized to generate power, the rotation of the output shaft 6211 of the electric control element 621 will drive the driving wheel 6221 to rotate, and the driven wheel 6222 transmits the rotational power from the driving wheel 6221 through the synchronous belt 6223, and the eccentric shaft fixedly connected with the driven wheel 6222 611 rotates together, and the rotation of the eccentric shaft 611 will drive the adjustment slider 612 which is rotationally connected with the eccentric shaft 611 to change its position in the first direction, thereby realizing the adjustment of the angle and height of the feed dog 41 .

The power output of the electronic control unit 621 drives the eccentric shaft 611 to rotate a certain preset angle through the transmission mode of the synchronous belt 6223, which can effectively and accurately adjust the height and inclination angle of the feed dog 41 and the feed dog 413, and further adapt to different thicknesses of fabrics It is easy to sew, and it is not easy to have problems such as fabric wrinkling or fabric layering.

Preferably, the synchronous belt 6223 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 6223 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 6221 is provided with a central through hole and the output shaft 6211 of the electric control element 621 is fixed on the electric control element 621 through an interference fit; Positioning plates (not numbered) extending radially from the wheel 6222 are respectively provided on both end surfaces of the 6222, and the positioning plates are used to limit the synchronous belt 6223 from accidentally falling out of the wheel 6222 in the axial direction.

Of course, the driving wheel 6221 can also be fixed on the electric control element 621 by means such as screw fastening, and the driven wheel 6222 can also be fixed on the concentric section 6111 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 6221 , the driven wheel 6222 and the synchronous belt 6223 .

Further, in order to maintain the transmission efficiency of the synchronous belt 6223, a tension member (not shown) is installed on the synchronous belt 6223 to drive the synchronous belt 6223 in a tensioned state.

Preferably, the tension member is arranged in a strip structure, one end of the tension member can be fixed on the housing 10 , and the other end is pressed on the outside of the timing belt 6223 , and the tension member 6226 is used to control the tension of the timing belt 6223 .

In this embodiment, since the central axis of the output shaft 6211 of the electric control element 621 and the central axis of the eccentric shaft 611 are parallel to each other, the transmission direction of the synchronous belt 6223 is consistent with the rotational direction of the eccentric shaft 611 . It can be understood that, in other embodiments, when the central axis of the output shaft 6211 of the electric control element 621 and the central axis of the eccentric shaft 611 deflect at other angles, the central axis of the driving wheel 6221 and the central axis of the driven wheel 6222 can also form a For other angles, such as vertical setting or the synchronous belt 6223 forming a cross-belt transmission, as long as the electronic control element 621 can be transmitted through the synchronous belt 6223 to control the rotation of the eccentric shaft 611 to a preset angle.

It can be understood that the utility model does not limit the transmission assembly 622 to only adopt the above-mentioned belt transmission transmission mode; One or more than one.

In this embodiment, the electric control element 621 is a stepping motor. It can be understood that in other embodiments, the electric control element 621 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 adjustment assembly 61 further includes a shaft sleeve 613, the shaft sleeve 613 sleeves the concentric section 6111 of the eccentric shaft 611 and is fixed on the housing 10, the shaft sleeve 613 is used to carry the eccentric shaft 611, providing A stable rotating environment for the eccentric shaft 611 is ensured. The shaft sleeve 613 has the advantages of anti-corrosion and low cost, and is more suitable for working conditions of low-speed rotation.

Further, the shaft sleeve 613 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 613 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 614 are respectively arranged on both sides of the adjusting slider 612, and the two retaining rings 614 are arranged on both sides of the adjusting slider 612 oppositely, and are sequentially sleeved with the adjusting slider 612. Installed on the eccentric section 6112 of the eccentric shaft 611 , the retaining ring 614 is used to fix the position of the adjusting slider 612 on the eccentric shaft 611 to prevent the adjusting slider 612 from shifting out of the sliding groove 418 due to vibration.

Further, the retaining ring 614 is fixed on the eccentric section 6112 of the eccentric shaft 611 by means of screw compression. Of course, the retaining ring 614 can also be fixed on the eccentric shaft 611 by other methods such as glue fixing and riveting, as long as the retaining ring 614 can be firmly fixed on the eccentric section 6112 of the eccentric shaft 611; To achieve its own positioning, the stop ring 614 can be omitted.

In order to realize the reset of the inclination and height of the feed dog frame, so that the overlock sewing machine 100 can reset the cloth feed dog frame 41 every time it is turned on or adjusted, an induction component 63 is also arranged in the overlock sewing machine 100, and the induction component 63 is used to sense and detect the deflection angle of the eccentric shaft 611. The sensing component 63 is electrically connected to a control element, and the control element is electrically connected to a driver. The driver is connected to the eccentric shaft 611 and can drive the eccentric shaft 611 to rotate.

The sensing component 63 continuously senses and acquires the deflection angle of the eccentric shaft 611. When the feed dog needs to be reset, the control part drives the driver to rotate, and the operation of the driver will drive the correspondingly connected eccentric shaft 611 to rotate until the eccentric shaft 611 is in the position of the control part. At the preset angle, the eccentric rotation of the eccentric shaft 611 can drive the cloth feeding dog 41 to reset, thereby realizing the whole reset process of the cloth feeding dog 41 .

Wherein, the rotation angle of the eccentric shaft 611 in the reset process is calculated by the control member according to the detection result of the sensing component 63 and the preset angle, that is, the detection result of the sensing component 63 to the deflection angle of the eccentric shaft 611 is compared with the preset angle The deviation between them is the rotation angle of the eccentric shaft 611 during the reset process.

It should be noted that the preset angle of the control member refers to the target angle to which the eccentric shaft 611 needs to be adjusted, and at this time the feed dog frame 41 is at the target inclination angle and height. In this embodiment, the preset angle refers to the angle of the eccentric shaft 611 when the cloth feeding dog frame 41 is horizontal, and at this time the cloth feeding dog frame 41 is in a horizontal position. Certainly, in other implementation manners, the preset angle may also be other angles than those mentioned above, and the specific value of the preset angle may be selected according to the requirements of actual working conditions.

In this embodiment, the above-mentioned driver is selected as the electronic control element 621, thereby avoiding the need for an additional driver for the overlock sewing machine 100, reducing the number of parts of the whole machine, and improving the compactness of the whole machine; the control part is selected as an overlock sewing machine 100 control center, the control center also controls the operation of each actuator of the overlock sewing machine 100 at the same time, and the control part is selected as the control center of the overlock sewing machine 100, which can avoid the need for additional control parts, reduce the number of parts of the whole machine, and improve the overall performance. The compactness of the machine.

At this time, the induction component 63 continuously senses and obtains the deflection angle of the eccentric shaft 611. When the cloth feed dog needs to be reset, the control center of the whole machine that controls the operation of each actuator of the overlock sewing machine 100 drives the electric control element 621 to operate, and the electric control element 621 runs and drives the eccentric shaft 611 to rotate to the preset angle of the control center through the transmission assembly 622, and the rotation of the eccentric shaft 611 drives the feeding dog frame 41 to reset to the target inclination angle and height, thereby realizing the reset process.

It can be understood that the present invention does not limit the driver to be selected as the above-mentioned electric control element 621. In other embodiments, the overlock sewing machine 100 can also be provided with an additional motor, cylinder or electromagnet to realize the rotation of the eccentric shaft 611. Adjustment of the angle; the utility model does not limit the control member to be only the complete machine control center of the overlock sewing machine 100. In other embodiments, the overlock sewing machine 100 can also be provided with additional control members such as control elements and control chips. To realize the control of the electric control element 621 and the processing of the detection signal of the sensing component 63 .

In this embodiment, the sensing component 63 uses the Hall effect to detect the rotation angle of the eccentric shaft 611 . The induction assembly 63 includes a Hall sensor 631 and a magnetic part (not shown in the figure), the magnetic part is connected to the eccentric shaft 611, and its position can change with the change of the deflection angle of the eccentric shaft 611; the Hall sensor 631 can sense the magnetic field around itself , when the position of the magnetic part changes, the Hall sensor 631 can calculate the position change of the magnetic part through the change of the magnetic field around itself; when the offset between the magnetic part and the Hall sensor 631 is the same as the current When the angles form a corresponding relationship, the Hall sensor 631 can detect the current deflection angle of the eccentric shaft 611 through the change of the magnetic field caused by the magnetic element.

In one embodiment of the present utility model, the magnetic member is magnet steel. It can be understood that, in other implementation manners, the magnetic member can also be other magnetic elements besides the magnetic steel.

In this embodiment, in order to realize the fixed connection between the magnetic part and the eccentric shaft 611, the magnetic part is provided with a connecting part 632. The connecting part 632 is roughly strip-shaped, one end of which is fixed and clamped on the concentric section 6111 of the eccentric shaft 611, The other end protrudes from the eccentric shaft 611 and extends between the Hall sensor 631 and the housing 10 .

Specifically, a groove (not shown) is formed on the end of the connecting piece 632 away from the eccentric shaft 611 , and the magnetic element is embedded and fixed in the groove and corresponds to the Hall sensor 631 . It can be understood that in other embodiments, the magnetic piece can also be fixed on other positions of the eccentric shaft 611 by bonding, screwing, etc., as long as the magnetic piece can be arranged on the connecting piece 632 and can be detected by the Hall sensor 631 just arrive.

By providing a connecting piece 632 connected to the eccentric shaft 611 between the eccentric shaft 611 and the Hall sensor 631, on the one hand, the connecting piece 632 can carry and fix the magnetic piece; on the other hand, the connecting piece 632 can enlarge the rotation angle of the eccentric shaft 611, It helps to improve the detection accuracy of the Hall sensor 632. Of course, the magnetic piece can also be directly arranged on the eccentric shaft 611, and the connecting piece 632 can be omitted in this case.

The induction component 63 forms the corresponding relationship between the rotation angle of the eccentric shaft 611 and the position of the magnetic part through the mutual connection between the magnetic part and the eccentric shaft 611. The specific position of the magnetic part can be detected by the Hall sensor 631, thereby realizing the use of induction The component 63 detects and obtains parameters of the current rotation angle of the eccentric shaft 611 .

The Hall sensor 631 is electrically connected to the above-mentioned control part, and the Hall sensor 631 can send the rotation angle parameter obtained by itself to the above-mentioned control part, and the control part then controls the electric control component 621 to rotate to a preset angle according to the parameter , so as to realize the reset process of the feed dog frame 41.

It can be understood that the present utility model is not limited to only using the Hall effect to detect the rotation angle of the eccentric shaft 611; in other embodiments, the sensing component 63 can also use other devices and principles such as an angle sensor and a gyroscope to detect the eccentricity The angle of rotation of the shaft 611.

Furthermore, in order to limit the rotation angle of the eccentric shaft 611 and avoid the excessive rotation of the eccentric shaft 611 when the machine stops, the magnetic parts will move too far, causing the magnetic parts to leave the detection range of the Hall sensor 631. The utility model provides In the overlock sewing machine 100 of the present invention, a limiting groove 633 is provided on the housing 10, and the limiting groove 633 is opened in a fan shape, and the connecting member 632 extends radially along the fan-shaped limiting groove 633 and can only rotate within a limited angle range.

In this embodiment, the rotatable angle range of the connecting piece 632 is limited to 0-120°, that is, the range of the fan-shaped central angle of the limiting groove 633 is 0-120°; it can be understood that in other embodiments, the connecting piece 632 The rotatable angle range can also be set to other angles than the above.

The principle that the overlock sewing machine 100 adjusts the angle and height of the feed dog 41 through the feed dog adjustment mechanism 60 to adapt to different thicknesses of cloth will be explained below.

When one end of the feed dog 41 changes in height under the adjustment of the feed dog adjustment mechanism 60, the overall inclination of the feed dog 41 changes, and the change in the overall inclination of the feed dog 41 will change the height of the feed dog 413. The inclination angle of the active tooth 4131 and the differential tooth 4132 is changed from being horizontally aligned to being evenly aligned at an oblique angle. Since the active tooth 4131 and the differential tooth 4132 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 15a to Figure 15c together, Figure 15a is a schematic diagram of the principle when the cloth feed dog 41 is in a normal working state, Figure 15b is a schematic diagram of the principle when the cloth feed dog 41 is in a thick material working state, and Figure 15c is a schematic diagram of the cloth feeding Schematic diagram of the principle when the tooth frame 41 is in the thin material working state. In the figure, the sign S represents the elliptical motion track of the active tooth 4131 and the differential tooth 4132, V represents the cutting angle direction when the active tooth 4131 and the differential tooth 4132 cut out the working plane, and F represents the pairing of the active tooth 4131 and the differential tooth 4132. The stretch direction of the cloth.

(1) When the cloth feeding dog frame 41 is in the normal working state: the cloth feeding dog frame 41 is not tilted, the driving tooth 4131 is level with the differential tooth 4132, and the driving tooth 4131 and the differential tooth 4132 contact the cloth synchronously. The direction of the elastic force F of 4131 and differential tooth 4132 acting on the fabric is the same as the cutting angle direction when the active tooth 4131 and differential tooth 4132 cut out the working plane, both are vertical directions, and this state is suitable for sewing with normal thickness and moderate hardness fabric.

(2) When the cloth feeding dog frame 41 is in the working state of thick material: the cloth feeding dog frame 41 is tilted so that the height of the active tooth 4131 is lower than the height of the differential tooth 4132. At this time, the active tooth 4131 and the differential tooth 4132 act on the cloth The direction of the elastic force F remains vertical, but the cutting angle direction when the active tooth 4131 and the differential tooth 4132 cut out the working plane no longer maintains the vertical direction, but feeds the cloth in an oblique cutting manner;

Since the height of the active tooth 4131 is lower than that of the differential tooth 4132, the differential tooth 4132 rises above the needle plate before the active tooth 4131 and contacts the cloth in advance, and the cloth feeding efficiency of the differential tooth 4132 is higher than that of the active tooth 4131 Therefore, when the active tooth 4131 and the differential tooth 4132 are conveying the cloth, the differential tooth 4132 has a certain catch-up effect relative to the active tooth 4131, forming a pushing effect on the cloth, so that the thick materials such as multi-layer and stem seams can be fed smoothly , the needle pitch is uniform, and the sewing quality is better.

(3) When the cloth feeding dog frame 41 is in the working state of thin material: the cloth feeding dog frame 41 is tilted so that the height of the active tooth 4131 is higher than the height of the differential tooth 4132. At this time, the active tooth 4131 and the differential tooth 4132 act on the cloth The direction of the elastic force F still remains vertical, but the cutting angle direction when the active tooth 4131 and the differential tooth 4132 cut out the working plane no longer maintains the vertical direction, and the active tooth 4131 and the differential tooth 4132 are cut obliquely. send cloth;

Since the height of the active tooth 4131 is higher than that of the differential tooth 4132, the active tooth 4131 rises above the needle plate 13 before the differential tooth 4132 and contacts the cloth in advance, and the feeding efficiency of the active tooth 4131 is higher than that of the differential tooth 4132. Therefore, when the active tooth 4131 and the differential tooth 4132 are conveying the cloth, the active tooth 4131 has a certain distance away from the differential tooth 4132, forming a drag effect on the cloth, so that the thin material such as mesh is flat and does not wrinkle, and the sewing Better quality.

The overlock sewing machine 100 provided by the utility model can detect the rotation angle of the eccentric shaft 611 by setting the induction component 63 electrically connected with the control member, so that the cloth feeding dog 41 can be reset to the initial position every time the machine is turned on or before detection, thereby To ensure the accuracy of subsequent adjustments, the working capacity of the overlock sewing machine 100 is improved, and has broad application prospects.

Those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the utility model, rather than as a limitation to the utility model, as long as within the spirit of the utility model, the above implementation methods Appropriate changes and changes all fall within the scope of protection of the utility model.

Claims (10)

1. A kind of overlock sewing machine, it is characterized in that, described overlock sewing machine comprises cloth feed dog frame and the cloth feed dog frame adjustment mechanism that is connected with described cloth feed dog frame, and described cloth feed dog frame adjustment mechanism comprises adjustment assembly And an operation assembly, the adjustment assembly includes an eccentric shaft connected to the feed dog, and the eccentric shaft rotates under the drive of the operation assembly to adjust the inclination and height of the feed dog; The overlock sewing machine includes an induction component, a driver and a control member. The induction component is used to sense the rotation angle of the eccentric shaft. The driver is connected to the eccentric shaft and can drive the eccentric shaft to rotate. The control The component is electrically connected to the driver and can control the operation of the driver, the control component controls the operation of the driver according to the detection result of the induction component, and the driver drives the eccentric shaft to rotate to a preset angle and reset The cloth feed dog frame. 2. The overlock sewing machine according to claim 1, wherein the induction component comprises a Hall sensor and a magnetic piece, the Hall sensor and the magnetic piece are oppositely arranged, and the magnetic piece is connected to the The eccentric shaft, the Hall sensor detects the rotation angle of the eccentric shaft through the movement of the magnetic part along with the eccentric shaft. 3. The overlock sewing machine according to claim 2, characterized in that, the magnetic member is a magnetic steel. 4. The overlock sewing machine according to claim 2, wherein a connecting piece is arranged between the eccentric shaft and the magnetic piece, one end of the connecting piece is connected to the eccentric shaft, and the other end carries the The magnetic parts. 5 . The overlock sewing machine according to claim 4 , wherein a groove is formed on the connecting member, and the magnetic member is embedded in the groove and arranged corresponding to the Hall sensor. 6 . 6. The overlock sewing machine according to claim 4, wherein the overlock sewing machine has a housing, and the housing is provided with a limiting groove for accommodating the connector, and the limiting groove is restricted by The swing angle of the connecting piece is used to limit the rotation angle of the eccentric shaft. 7 . The overlock sewing machine according to claim 6 , wherein the limiting groove is fan-shaped, and the connecting piece is strip-shaped and extends radially of the limiting groove. 8 . 8. The overlock sewing machine according to claim 1, wherein the adjustment assembly includes an adjustment slider, and the adjustment slider is embedded in the feed dog frame and can be opposite to the cloth feed dog frame Sliding, 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 rotatably cooperates with the adjustment slider; The operation assembly includes an electric control element and a transmission assembly, and the electric control element controls the rotation of the eccentric shaft under the transmission action of the transmission assembly and drives the adjustment slider to adjust the inclination and height of the feeding dog frame ; The overlock sewing machine has a control center, which is used to control the operation of each component of the overlock sewing machine. 9. The overlock sewing machine according to claim 8, wherein the driver is integrated with the electronic control element, and/or The control part is integrated with the control center. 10. The overlock sewing machine according to claim 8, wherein the transmission assembly is at least one of a chain drive, a belt drive, a gear drive, and a worm gear drive.