CN112160078B

CN112160078B - Cloth feeding tooth frame adjusting mechanism and overedger

Info

Publication number: CN112160078B
Application number: CN202010813615.1A
Authority: CN
Inventors: 朱赛瑞; 芈韶雷; 徐永明; 赵林蔚
Original assignee: Jack Sewing Machine Co Ltd
Current assignee: Jack Technology Co Ltd
Priority date: 2020-08-13
Filing date: 2020-08-13
Publication date: 2021-11-02
Anticipated expiration: 2040-08-13
Also published as: CN112160078A; CN113737400A; CN113737400B

Abstract

The invention relates to a feed dog adjusting mechanism and a overedger, wherein the feed dog adjusting mechanism comprises: the device comprises a main shaft, a cloth feeding tooth frame, a sliding block and an upper and lower amplitude adjusting assembly. The feed dog frame is provided with a first sliding groove, the sliding block is embedded in the first sliding groove in a front-back sliding mode, the sliding block is provided with a first through hole, and the main shaft penetrates through the first through hole. The main shaft is located to upper and lower range adjusting part cover, and upper and lower range adjusting part one end is worn to locate first through-hole and is used for the position of adjusting the slider, and upper and lower range adjusting part is through the position of the first through-hole of adjusting the slider for the main shaft to change the center of main shaft and the relative distance in center of first through-hole. The invention solves the problem that the vertical movement amplitude of the feed dog frame in the prior art can not be adjusted.

Description

Cloth feeding tooth frame adjusting mechanism and overedger

Technical Field

The invention relates to the technical field of sewing machines, in particular to a cloth feeding tooth rack adjusting mechanism and an overedger.

Background

The overlock sewing machine is mainly used for serging and sewing textiles and has wide application in the field of sewing. The feeding process of the overedger is mainly realized by the reciprocating elliptical motion of the feed dog frame, and the overedger continuously jacks and pulls the cloth on the needle plate through the feed dog frame, so that the cloth to be processed is continuously dragged and conveyed to the machine head to complete the whole feeding process.

Usually, the feed dog is driven by a spindle and the feed dog forms an ellipse-like motion trajectory in a plane. However, the conventional feed dog adjusting mechanism can only adjust the forward and backward movement amplitude of the feed dog, but cannot adjust the up and down movement amplitude of the feed dog. Therefore, the range of use of the feed dog is greatly reduced.

Disclosure of Invention

In view of the above, it is necessary to provide a feed dog adjusting mechanism and a overedger, which solve the problem that the vertical movement amplitude of the feed dog in the prior art cannot be adjusted.

The invention provides a feed dog adjusting mechanism, comprising: the device comprises a main shaft, a cloth feeding tooth frame, a sliding block and an upper and lower amplitude adjusting assembly. The feed dog frame is provided with a first sliding groove, the sliding block is embedded in the first sliding groove in a front-back sliding mode, the sliding block is provided with a first through hole, and the main shaft penetrates through the first through hole. The main shaft is located to upper and lower range adjusting part cover, and upper and lower range adjusting part one end is worn to locate first through-hole and is used for the position of adjusting the slider, and upper and lower range adjusting part is through the position of the first through-hole of adjusting the slider for the main shaft to change the center of main shaft and the relative distance in center of first through-hole. The upper and lower amplitude adjusting assembly comprises an upper and lower adjusting sleeve, the upper and lower adjusting sleeve is sleeved on the main shaft, and the upper and lower adjusting sleeve is penetrated in the first through hole. The upper and lower adjusting sleeve is provided with a second through hole, the inner wall of the second through hole is provided with two mutually parallel first sliding surfaces, the outer wall of the main shaft is provided with two mutually parallel second sliding surfaces corresponding to the first sliding surfaces, and the first sliding surfaces of the upper and lower adjusting sleeve can slide by being attached to the second sliding surfaces of the main shaft so as to adjust the relative distance between the center of the main shaft and the center of the first through hole.

In an embodiment of the present invention, the vertical amplitude adjustment assembly further includes a vertical driving wheel and a vertical driving sliding sleeve, and the spindle sequentially penetrates through the vertical adjustment sleeve, the vertical driving sliding sleeve and the vertical driving wheel. The end of the upper and lower adjusting sleeve far away from the feed dog frame is provided with a second chute, the upper and lower driving sliding sleeve is slidably arranged in the second chute, and the sliding direction of the upper and lower driving sliding sleeve in the second chute is not parallel to the sliding direction of the upper and lower adjusting sleeve on the main shaft. One end of the upper and lower driving wheels, which is close to the feed dog frame, is provided with a first eccentric part, the first eccentric part and the main shaft are eccentrically arranged, and the upper and lower driving sliding sleeves are sleeved outside the first eccentric part. So set up, can utilize the rotation of main shaft to reach the purpose of the eccentric degree of first through-hole for the main shaft for the operation that changes the up-and-down motion range size of work feed dental articulator becomes simple effective.

In an embodiment of the present invention, the upper and lower driving wheels are provided at outer peripheral sides thereof with a locking groove for an external tool to be inserted into to fix the upper and lower driving wheels. So set up, can firmly fix upper and lower drive wheel, be favorable to the range adjustment process of sending out cloth dental frame to keep stable.

In an embodiment of the invention, the vertical amplitude adjusting assembly further includes a vertical moving sliding sleeve, a vertical ratchet wheel, and the main shaft is further disposed through the vertical moving sliding sleeve and the vertical ratchet wheel, and the vertical ratchet wheel is fixedly disposed on the main shaft. One end of the upper and lower driving wheels, which is far away from the feed dog frame, is provided with a third chute, and the up-and-down moving sliding sleeve is arranged in the third chute in a sliding manner. The up-down moving sliding sleeve is arranged on the peripheral sides of the upper ratchet wheel and the lower ratchet wheel, an upper pawl and a lower pawl are fixedly arranged on the inner wall of one side of the up-down moving sliding sleeve, and the up-down moving sliding sleeve slides in the third sliding chute so as to enable the upper pawl and the lower pawl to be meshed with or separated from the upper ratchet wheel and the lower ratchet wheel. The use mode and the adjusting mode of the feed dog frame adjusting mechanism can be quickly switched by the sliding fit of the up-and-down moving sliding sleeve with the upper pawl and the lower pawl and the upper ratchet wheel and the lower ratchet wheel.

In an embodiment of the invention, the upper and lower amplitude adjustment assembly further includes an upper and lower return spring, one end of the upper and lower return spring is connected to the upper and lower driving wheels, and the other end of the upper and lower return spring abuts against one side of the upper and lower pawls away from the upper and lower ratchet wheels, so that the upper and lower pawls of the up-and-down moving sliding sleeve have a tendency to move towards the upper and lower ratchet wheels and mesh with the upper and lower ratchet wheels. So set up, can make the upper and lower pawl of separation and upper and lower ratchet mesh together automatically under the effect of upper and lower reset spring when the external force effect that drives upper and lower pawl and upper and lower ratchet separation disappears. And under the action of the upper and lower return springs, the engagement between the upper and lower pawls and the upper and lower ratchets is more stable.

In one embodiment of the present invention, the upper and lower pawls have a limit groove on one side away from the upper and lower ratchet wheels, and the upper and lower return springs comprise torsion springs; the middle part of the torsion spring is rotatably connected with the upper and lower driving wheels through a short pin; one end of the torsion spring is fixedly connected with the upper and lower driving wheels; the other end of the torsion spring is connected with the limiting groove in an abutting mode. The torsion spring is simple in structure and can provide large elastic force, the middle of the torsion spring can rotate around the short pin under the supporting action of the short pin, the upper and lower driving wheels are fixedly connected with one end of the torsion spring, and the other end of the torsion spring is abutted to the limiting grooves of the upper and lower pawls. Therefore, when the upper and lower pawls are pushed away from the upper and lower ratchet wheels, the torsion spring will elastically deform, and will generate elastic force tending to the upper and lower ratchet wheels to the upper and lower pawls under the supporting action of one end fixed to the upper and lower driving wheels and the short pin. When the acting force pushing the upper pawl and the lower pawl to be far away from the upper ratchet wheel and the lower ratchet wheel is removed, the torsion spring pushes the upper pawl and the lower pawl to be meshed with the upper ratchet wheel and the lower ratchet wheel again.

In one embodiment of the invention, the feed dog frame adjusting mechanism further comprises a front and rear amplitude adjusting component and a transmission mechanism, and the main shaft sequentially penetrates through the upper and lower amplitude adjusting component and the front and rear amplitude adjusting component; the transmission mechanism is connected with the front and rear amplitude adjusting assembly and the cloth feeding tooth rack, so that the front and rear amplitude adjusting assembly can drive the cloth feeding tooth rack to move along the front and rear directions through the transmission mechanism. By the arrangement, the vertical movement amplitude and the front-back movement amplitude of the cloth feeding tooth frame can be adjusted simultaneously, and the application range of the overedger with the cloth feeding tooth frame is greatly expanded.

In an embodiment of the present invention, the front-back amplitude adjustment assembly includes: the device comprises a fixed wheel, a large eccentric wheel, a bearing, a front output connecting rod, a rear output connecting rod, a front driving wheel, a rear driving wheel, a front moving sliding sleeve, a rear pawl, a front ratchet wheel, a rear ratchet wheel and a front return spring. The fixed wheel is connected with the upper and lower amplitude adjusting components in a clamping manner. One end of the large eccentric wheel is connected with the fixed wheel, and the other end of the large eccentric wheel is provided with a second eccentric part. The bearing sleeve is arranged on the second eccentric part. The front and rear output connecting rods are sleeved on the bearings. And one end of the front and rear driving wheels is provided with a third eccentric part, the third eccentric part penetrates through the second eccentric part, and the other end of the front and rear driving wheels is provided with a fourth chute. The front-back moving sliding sleeve is slidably arranged in the fourth sliding groove, and a front pawl and a rear pawl are fixedly arranged on the inner wall of one side of the front-back moving sliding sleeve. The front ratchet wheel and the rear ratchet wheel are fixedly arranged on the main shaft, the front-back moving sliding sleeve is arranged on the outer peripheral side of the front ratchet wheel and the rear ratchet wheel, and the front-back moving sliding sleeve slides in the fourth sliding groove to enable the front pawl and the rear pawl to be meshed with or separated from the front ratchet wheel and the rear ratchet wheel. One end of the front return spring and the rear return spring is connected with the front driving wheel and the rear driving wheel, and the other end of the front return spring and the rear return spring are abutted to one side of the front pawl and the rear pawl far away from the front ratchet wheel and the rear ratchet wheel, so that the front pawl and the rear pawl have the tendency of moving towards the front ratchet wheel and the rear ratchet wheel and being meshed with the front ratchet wheel and the rear ratchet wheel. So set up, work feed dental frame adjustment mechanism's structure is compacter, is favorable to the moment of main shaft output to transmit to work feed dental frame fast.

According to the feed dog frame adjusting mechanism provided by the invention, the spindle and the first through hole of the sliding block are not coaxial, and the vertical amplitude adjusting assembly for transmitting the moment of the spindle is sleeved between the spindle and the sliding block, so that when the spindle tends to rotate, the sliding block tends to rotate relative to the spindle and also tends to revolve around the axis of the spindle. However, the sliding block is embedded in the first sliding groove of the feed dog frame in a manner of sliding back and forth. Therefore, the tendency of the sliding block to rotate is converted into the tendency of sliding back and forth along the first sliding groove, namely, the feed dog holder limits the sliding block to rotate. That is, when the main shaft rotates, the slide block can drive the cloth feeding tooth frame to revolve around the axis of the main shaft. At the moment, the motion trail of the feed dog frame is approximately elliptical.

Because the slider is equipped with first through-hole, the main shaft wears to locate first through-hole. Therefore, the relative distance between the center of the main shaft and the center of the first through hole is changed, namely the up-and-down movement amplitude of the sliding block relative to the main shaft can be changed. Therefore, the vertical amplitude adjusting component can change the vertical motion amplitude of the cloth feeding tooth rack. That is, the feed dog adjusting mechanism effectively solves the problem that the up-and-down motion amplitude of the feed dog in the prior art cannot be adjusted.

The invention also provides an overedger which comprises the cloth feeding tooth rack adjusting mechanism in any one of the embodiments.

Drawings

FIG. 1 is a perspective view of a feed dog adjustment mechanism according to an embodiment of the present invention;

FIG. 2 is an exploded view of a feed dog adjustment mechanism according to an embodiment of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is a schematic view of the upper and lower adjustment sleeves engaged with the spindle according to an embodiment of the present invention;

FIG. 5 is a schematic structural view of the upper and lower driving wheels having a first eccentric portion according to an embodiment of the present invention;

FIG. 6 is a schematic structural view of the front and rear driving wheels having a third eccentric portion according to an embodiment of the present invention.

Reference numerals: 1. a main shaft; 11. a second sliding surface; 2. a feed dog frame; 21. a first chute; 3. a slider; 31. a first through hole; 4. an up-down amplitude adjustment component; 41. an upper and lower adjusting sleeve; 411. a second through hole; 412. a first sliding surface; 413. a second chute; 42. an upper driving wheel and a lower driving wheel; 421. a first eccentric portion; 422. a card slot; 423. a third chute; 43. driving the sliding sleeve up and down; 44. moving the sliding sleeve up and down; 45. an upper pawl and a lower pawl; 451. a limiting groove; 46. an upper ratchet wheel and a lower ratchet wheel; 47. an upper and lower return spring; 48. a short pin; 5. a front-back amplitude adjustment component; 51. a fixed wheel; 52. a large eccentric wheel; 521. a second eccentric portion; 53. a bearing; 54. a front and rear output link; 55. front and rear drive wheels; 551. a third eccentric portion; 552. a fourth chute; 56. moving the sliding sleeve back and forth; 57. front and rear pawls; 58. a front ratchet wheel and a rear ratchet wheel; 59. a front and rear return spring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly mounted on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and 2, fig. 1 is a perspective view of an adjusting mechanism of a feed dog 2 according to an embodiment of the present invention, and fig. 2 is an exploded view of the adjusting mechanism of the feed dog 2 according to an embodiment of the present invention. The invention provides a feed dog 2 regulating mechanism, comprising: the cloth feeding device comprises a main shaft 1, a cloth feeding tooth frame 2, a sliding block 3 and an upper and lower amplitude adjusting component 4. The feed dog frame 2 is provided with a first sliding groove 21, the sliding block 3 is embedded in the first sliding groove 21 in a front-back sliding manner, the sliding block 3 is provided with a first through hole 31, and the main shaft 1 penetrates through the first through hole 31. The main shaft 1 is located to upper and lower range adjusting part 4 cover, and the position that first through-hole 31 was used for adjusting slider 3 is worn to locate by upper and lower range adjusting part 4 one end, and upper and lower range adjusting part 4 is through the relative distance of the center of adjusting main shaft 1 and the center of first through-hole 31, adjusts the position of slider 3 for main shaft 1 to change the eccentric degree of first through-hole 31 for main shaft 1. The term "degree of eccentricity of the first through hole 31 with respect to the spindle 1" means a distance between the center line of the spindle 1 and the center line of the first through hole 31. It can be understood that, when the distance between the center line of the spindle 1 and the center line of the first through hole 31 is zero, the spindle 1 and the first through hole 31 are concentrically arranged; when the distance between the center line of the main shaft 1 and the center line of the first through hole 31 is greater than zero, the main shaft 1 and the first through hole 31 are eccentrically arranged. The greater the distance between the center line of the main shaft 1 and the center line of the first through hole 31, the greater the degree of eccentricity.

In this embodiment, an up-down amplitude adjusting assembly 4 for transmitting the torque of the spindle 1 is further sleeved between the spindle 1 and the slider 3, so that when the spindle 1 tends to rotate, the slider 3 tends to rotate relative to the spindle 1 and also tends to revolve around the axis of the spindle 1. However, the slider 3 is slidably fitted into the first slide groove 21 of the feed dog holder 2 in the front-rear direction. Therefore, the tendency of the slider 3 to rotate is converted into the tendency of sliding back and forth along the first slide groove 21, that is, the feed dog 2 restricts the slider 3 from rotating. That is, when the main shaft 1 rotates, the slider 3 drives the feed dog carrier 2 to revolve around the axis of the main shaft 1. At this time, the motion trail of the feed dog frame 2 is approximately elliptical.

Since the slider 3 is provided with the first through hole 31, the main shaft 1 is inserted into the first through hole 31. Therefore, by changing the eccentricity of the first through hole 31 with respect to the main shaft 1, the vertical movement amplitude of the slider 3 can be changed. And the up-down amplitude adjustment assembly 4 can change the eccentric position of the first through hole 31 with respect to the main shaft 1. Therefore, the vertical amplitude adjustment assembly 4 can change the vertical movement amplitude of the feed dog frame 2. That is, the adjusting mechanism of the feed dog frame 2 in the embodiment effectively solves the problem that the up-and-down movement amplitude of the feed dog frame 2 in the prior art cannot be adjusted.

In one embodiment, as shown in fig. 2 and 4, fig. 4 is a schematic view of the up-down adjusting sleeve 41 and the main shaft 1 according to one embodiment of the present invention. The vertical amplitude adjusting assembly 4 includes a vertical adjusting sleeve 41, the spindle 1 is sleeved with the vertical adjusting sleeve 41, and the vertical adjusting sleeve 41 penetrates through the first through hole 31. The up-down adjusting sleeve 41 is provided with a second through hole 411, the inner wall of the second through hole 411 is provided with two mutually parallel first sliding surfaces 412, the outer wall of the spindle 1 is provided with two mutually parallel second sliding surfaces 11 corresponding to the first sliding surfaces 412, and the first sliding surfaces 412 of the up-down adjusting sleeve 41 can slide against the second sliding surfaces 11 of the spindle 1 to adjust the eccentricity degree of the first through hole 31 relative to the spindle 1.

Because the up-down adjusting sleeve 41 is sleeved on the main shaft 1, and the up-down adjusting sleeve 41 is inserted into the first through hole 31. Therefore, the first sliding surface 412 of the vertical adjustment sleeve 41 slides against the second sliding surface 11 of the spindle 1, and the degree of eccentricity of the first through hole 31 with respect to the spindle 1 can be adjusted. At this time, the vertical movement range adjusting assembly 4 can change the vertical movement range of the feed dog frame 2 through the vertical adjusting sleeve 41.

In an embodiment, as shown in fig. 2 and 5, fig. 5 is a schematic structural view illustrating that the upper and lower driving wheels 42 are provided with the first eccentric portion 421 according to an embodiment of the present invention. The vertical amplitude adjusting assembly 4 further comprises a vertical driving wheel 42 and a vertical driving sliding sleeve 43, and the spindle 1 sequentially penetrates through the vertical adjusting sleeve 41, the vertical driving sliding sleeve 43 and the vertical driving wheel 42. The upper and lower adjusting sleeve 41 is provided with a second sliding groove 413 at one end far away from the feed dog frame 2, the upper and lower driving sliding sleeve 43 is slidably arranged in the second sliding groove 413, and the sliding direction of the upper and lower driving sliding sleeve 43 in the second sliding groove 413 is not parallel to the sliding direction of the upper and lower adjusting sleeve 41 on the main shaft 1. The upper and lower driving wheel 42 is provided with a first eccentric portion 421 at one end close to the feed dog frame 2, the first eccentric portion 421 is eccentrically arranged with the main shaft 1, and the upper and lower driving sliding sleeve 43 is sleeved outside the first eccentric portion 421. "the first eccentric portion 421 is eccentrically provided to the main shaft 1" means that a distance between a center line of the main shaft 1 and a center line of the first eccentric portion 421 is greater than zero.

In the process of adjusting the eccentricity of the first through hole 31 relative to the main shaft 1, the upper and lower driving wheels 42 are radially fixed, so that the upper and lower driving wheels 42 cannot rotate relative to the main shaft 1; then, the main shaft 1 is rotated, and at the moment, the main shaft 1 transmits the torque to the up-down adjusting sleeve 41 through the first sliding surface 412 and the second sliding surface 11; because the end of the up-down adjusting sleeve 41 far away from the feed dog frame 2 is provided with the second sliding groove 413, the up-down driving sliding sleeve 43 is slidably arranged in the second sliding groove 413, and the sliding direction of the up-down driving sliding sleeve 43 in the second sliding groove 413 is not parallel to the sliding direction of the up-down adjusting sleeve 41 on the main shaft 1, the up-down adjusting sleeve 41 further transmits the moment to the up-down driving sliding sleeve 43 through the second sliding groove 413; the upper and lower driving wheels 42 are provided with a first eccentric portion 421 at one end close to the feed dog carrier 2, the first eccentric portion 421 is eccentrically arranged with the main shaft 1, and the upper and lower driving sliding sleeves 43 are sleeved outside the first eccentric portion 421, so that the upper and lower driving sliding sleeves 43 continuously transmit the moment to the upper and lower driving wheels 42 through the first eccentric portion 421; because the upper and lower drive wheels 42 are radially locked during adjustment, the upper and lower drive wheels 42 do not rotate but provide a counter support force; after the reverse supporting force is transmitted to the up-down driving sliding sleeve 43 through the first eccentric portion 421, the reverse supporting force will be decomposed into a component force perpendicular to the sliding direction of the up-down driving sliding sleeve 43 in the second sliding slot 413 and a component force parallel to the sliding direction of the up-down driving sliding sleeve 43 in the second sliding slot 413, the component force parallel to the sliding direction of the up-down driving sliding sleeve 43 in the second sliding slot 413 will be cancelled by the friction force generated by the friction between the up-down driving sliding sleeve 43 and the second sliding slot 413, the component force perpendicular to the sliding direction of the up-down driving sliding sleeve 43 in the second sliding slot 413 will push the up-down driving sliding sleeve 43 to move, and the moving direction of the up-down driving sliding sleeve 43 is along the direction parallel to the sliding direction of the up-down driving sliding sleeve 43 in the second sliding slot 413; at this time, the inner wall of the second sliding slot 413 of the up-down adjusting sleeve 41 is pushed by the up-down driving sliding sleeve 43, and the up-down adjusting sleeve 41 is displaced relative to the main shaft 1 by the pushing force, that is, the first sliding surface 412 of the up-down adjusting sleeve 41 slides against the second sliding surface 11 of the main shaft 1, and finally the eccentricity of the first through hole 31 relative to the main shaft 1 is changed. In this way, the rotation of the main shaft 1 can be utilized to achieve the purpose of the eccentricity degree of the main shaft 1 relative to the first through hole 31, so that the operation of changing the vertical movement amplitude of the feed dog frame 2 is simple and efficient.

In one embodiment, as shown in fig. 2 and 5, the upper and lower driving wheels 42 are provided with locking grooves 422 at the outer circumferential sides thereof, and the locking grooves 422 are used for inserting an external tool to limit the rotation of the upper and lower driving wheels 42. Specifically, when the upper and lower drive wheels 42 need to be locked, an external tool (e.g., a screwdriver) is inserted into the slot 422 to radially lock the upper and lower drive wheels 42. With such an arrangement, the upper and lower driving wheels 42 can be firmly fixed, which is beneficial to keeping the adjustment process of the vertical amplitude of the feed dog frame 2 stable. In one embodiment, as shown in fig. 2 and 3, fig. 3 is an enlarged view of a shown in fig. 2. The up-down amplitude adjusting assembly 4 further comprises an up-down moving sliding sleeve 44 and an up-down ratchet 46, the main shaft 1 further penetrates through the up-down moving sliding sleeve 44 and the up-down ratchet 46, and the up-down ratchet 46 is fixedly arranged on the main shaft 1. A third sliding groove 423 is formed at one end of the upper and lower driving wheel 42 away from the feed dog carrier 2, and the upper and lower sliding sleeve 44 is slidably disposed in the third sliding groove 423. The up-down moving sliding bush 44 is provided on the outer peripheral side of the up-down ratchet 46, and the up-down pawl 45 is fixedly provided on the inner wall of one side of the up-down moving sliding bush 44, and the up-down moving sliding bush 44 slides in the third sliding groove 423 to engage or disengage the up-down pawl 45 with or from the up-down ratchet 46.

When the upper and lower pawls 45 and the upper and lower ratchet wheels 46 are engaged together, since the upper and lower ratchet wheels 46 are fixedly arranged on the main shaft 1, the main shaft 1 will drive the upper and lower ratchet wheels 46 to rotate, and the upper and lower ratchet wheels 46 drive the up-and-down moving sliding sleeve 44 to rotate through the engaged upper and lower pawls 45. The up-down sliding sleeve 44 is slidably disposed in the third sliding slot 423, so that the up-down sliding sleeve 44 rotates to drive the up-down driving wheel 42 to rotate. Eventually, the slide 3 and the feed adjustment mechanism will also rotate.

When the up-and-down movement amplitude of the feed dog frame 2 needs to be adjusted, the up-and-down moving sliding sleeve 44 is pushed to slide along the third sliding groove 423, so that the upper and lower pawls 45 and the upper and lower ratchet wheels 46 can be separated. Then, the eccentricity of the first through hole 31 with respect to the main shaft 1 can be changed by rotating the main shaft 1, and finally, the vertical movement amplitude of the feed dog carrier 2 is changed. The specific process has been mentioned above and will not be described repeatedly here.

The use mode and the adjustment mode of the adjustment mechanism of the feed dog carrier 2 can be switched rapidly by the sliding fit of the up-and-down moving slide bush 44 provided with the up-and-down pawls 45 and the up-and-down ratchet 46. The use mode of the feed dog 2 adjusting mechanism refers to: when the upper and lower pawls 45 and the upper and lower ratchet gears 46 are engaged together, the main shaft 1 drives the feed dog carrier 2 to move up and down by its rotation. The adjusting mode of the adjusting mechanism of the feed dog carrier 2 refers to: when the up-down pawl 45 and the up-down ratchet 46 are separated, the main shaft 1 drives the first sliding surface 412 of the up-down adjusting sleeve 41 to slide against the second sliding surface 11 of the main shaft 1 through rotation of the main shaft 1, and finally the eccentricity degree of the first through hole 31 relative to the main shaft 1 is changed.

In one embodiment, as shown in fig. 2 and 3, the up-down amplitude adjustment assembly 4 further comprises an up-down return spring 47, one end of the up-down return spring 47 is connected with the up-down driving wheel 42 and the other end abuts against one side of the up-down pawl 45 away from the up-down ratchet wheel 46, so that the up-down pawl 45 of the up-down moving sliding sleeve 44 has a tendency to move towards the up-down ratchet wheel 46 and to engage with the up-down ratchet wheel 46. With this arrangement, when the external force for separating the upper and lower pawls 45 and the upper and lower ratchet gears 46 is eliminated, the separated upper and lower pawls 45 and the separated upper and lower ratchet gears 46 are automatically engaged together by the upper and lower return springs 47. And, the engagement of the upper and lower pawls 45 and the upper and lower ratchet gears 46 is more stabilized by the upper and lower return springs 47. But not limited thereto, the automatic engagement of the upper and lower pawls 45 and the upper and lower ratchet gears 46 may also be achieved by an extension spring.

In one embodiment, as shown in fig. 2 and 3, the upper and lower pawls 45 are provided with a limit groove 451 at a side thereof away from the upper and lower ratchet wheels 46, and the upper and lower return springs 47 comprise torsion springs; the middle of the torsion spring is rotatably connected to the upper and lower drive wheels 42 by a short pin 48; one end of the torsion spring is fixedly connected to the upper and lower driving wheels 42; the other end of the torsion spring is abutted against the limiting groove 451. The torsion spring has a simple structure and can provide a large elastic force, the middle part of the torsion spring can rotate around the short pin 48 under the supporting action of the short pin 48, and one end of the torsion spring is fixedly connected with the upper and lower driving wheels 42, and the other end of the torsion spring is abutted to the limit groove 451 of the upper and lower pawls 45. Therefore, when the upper and lower pawls 45 are pushed away from the upper and lower ratchet wheels 46, the torsion spring is elastically deformed, and the torsion spring exerts an elastic force on the upper and lower pawls 45 toward the upper and lower ratchet wheels 46 under the support of the one end fixed to the upper and lower drive wheels 42 and the short pin 48. When the force pushing the upper and lower pawls 45 away from the upper and lower ratchet gears 46 is removed, the torsion spring will push the upper and lower pawls 45 and the upper and lower ratchet gears 46 to re-engage. The limiting groove 451 can enable the connection between the torsion spring and the upper and lower pawls 45 to be more stable, so that the torsion spring cannot slide on the side of the upper and lower pawls 45 away from the upper and lower ratchet wheels 46.

In one embodiment, as shown in fig. 1 and 2, the adjusting mechanism of the feed dog carrier 2 further comprises a front-back amplitude adjusting assembly 5 and a transmission mechanism, and the spindle 1 sequentially penetrates through the upper-lower amplitude adjusting assembly 4 and the front-back amplitude adjusting assembly 5; the transmission mechanism is connected with the front and back amplitude adjusting component 5 and the feed dog frame 2, so that the front and back amplitude adjusting component 5 can drive the feed dog frame 2 to move along the front and back direction through the transmission mechanism. With the arrangement, the vertical movement amplitude and the front-back movement amplitude of the cloth feeding tooth frame 2 can be adjusted simultaneously, and the application range of the overedger with the cloth feeding tooth frame 2 is greatly expanded.

In one embodiment, as shown in fig. 1, 2 and 6, fig. 5 is a schematic structural view illustrating that the front and rear driving wheels 55 are provided with the third eccentric portions 551 according to one embodiment of the present invention. The front-rear amplitude adjustment assembly 5 includes: a fixed wheel 51, a large eccentric wheel 52, a bearing 53, a front and rear output connecting rod 54, a front and rear driving wheel 55, a front and rear moving sliding sleeve 56, a front and rear pawl 57, a front and rear ratchet wheel 58 and a front and rear return spring 59. The fixed wheel 51 is connected with the up-down amplitude adjusting component 4 in a clamping way. One end of the large eccentric wheel 52 is connected with the fixed wheel 51, and the other end of the large eccentric wheel 52 is provided with a second eccentric part 521. The bearing 53 is sleeved on the second eccentric portion 521. The front and rear output links 54 are fitted to the bearings 53. One end of the front and rear driving wheel 55 is provided with a third eccentric portion 551, the third eccentric portion 551 is inserted into the second eccentric portion 521, and the other end of the front and rear driving wheel 55 is provided with a fourth sliding slot 552. The front-back moving sliding sleeve 56 is slidably arranged in the fourth sliding groove 552, and a front pawl 57 and a back pawl are fixedly arranged on the inner wall of one side of the front-back moving sliding sleeve 56. The front and rear ratchet wheels 58 are fixedly arranged on the main shaft 1, the front and rear moving sliding sleeve 56 is arranged on the outer peripheral side of the front and rear ratchet wheels 58, and the front and rear moving sliding sleeve 56 slides in the fourth sliding groove 552 to enable the front and rear pawls 57 to be meshed with or separated from the front and rear ratchet wheels 58. The front and rear return spring 59 has one end connected to the front and rear drive wheels 55 and the other end abutting on a side of the front and rear pawls 57 remote from the front and rear ratchet wheels 58, so that the front and rear pawls 57 have a tendency to move toward the front and rear ratchet wheels 58 and to engage with the front and rear ratchet wheels 58.

When the front and rear pawls 57 and the front and rear ratchet wheels 58 are engaged together, since the front and rear ratchet wheels 58 are fixed to the main shaft 1, the rotation of the main shaft 1 drives the front and rear ratchet wheels 58 to rotate, and the front and rear ratchet wheels 58 drive the front and rear sliding sleeves 56 to rotate through the engaged front and rear pawls 57. Because the forward-backward moving bush 56 is disposed in the fourth sliding groove 552 of the forward-backward driving wheel 55, the forward-backward moving bush 56 further rotates the forward-backward driving wheel 55. Since the front and rear driving wheels 55 are provided with the third eccentric portion 551 and the third eccentric portion 551 is inserted into the second eccentric portion 521 of the large eccentric wheel 52, the front and rear driving wheels 55 and the large eccentric wheel 52 are eccentrically rotated. The bearing 53 is sleeved on the second eccentric portion 521, so that the bearing 53 will also generate eccentric rotation, and finally, the front and rear output links 54 sleeved on the bearing 53 are driven to move in the front and rear directions. The front and rear output links 54 drive the feed dog carrier 2 to move in the front and rear directions through a transmission mechanism.

When the back-and-forth movement amplitude of the feed dog carrier 2 needs to be adjusted, the front-and-back pawl 57 and the front-and-back ratchet wheel 58 can be separated by pushing the front-and-back moving sliding sleeve 56 to slide in the fourth sliding groove 552. The front and rear drive wheels 55 are fixed so that the front and rear drive wheels 55 do not rotate with the rotation of the main shaft 1. At this time, the main shaft 1 is rotated to drive the fixed wheel 51 connected with the vertical amplitude adjusting assembly 4 in a clamping manner to rotate. Since the fixed wheel 51 is connected to the large eccentric wheel 52 through a key wheel mechanism, the fixed wheel 51 will drive the large eccentric wheel 52 to rotate, the third eccentric portion 551 of the large eccentric wheel 52 will rotate at a certain angle relative to the bearing 53, at this time, the eccentricity between the bearing 53 and the main shaft 1 will change, and finally the eccentricity between the front and rear output links 54 and the main shaft 1 will change. The front and rear output links 54 drive the feed dog carrier 2 through the transmission mechanism to change the movement amplitude in the front and rear directions.

So set up, the structure of 2 adjustment mechanism of work feed teeth frame is compacter, is favorable to the moment of main shaft 1 output to transmit to work feed teeth frame 2 fast.

The features of the above-described embodiments may be arbitrarily combined, and for the sake of brevity, all possible combinations of the features in the above-described embodiments are not described, but should be construed as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the features.

It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that suitable changes and modifications of the above embodiments are within the scope of the claimed invention as long as they are within the spirit and scope of the present invention.

Claims

1. A feed dog adjustment mechanism, comprising:

a main shaft (1);

the cloth feeding tooth rack (2) is provided with a first sliding chute (21);

the sliding block (3) is embedded in the first sliding groove (21) in a front-back sliding manner, the sliding block (3) is provided with a first through hole (31), and the main shaft (1) penetrates through the first through hole (31); and

the upper and lower amplitude adjusting component (4) is sleeved on the main shaft (1), one end of the upper and lower amplitude adjusting component (4) penetrates through the first through hole (31) and is used for adjusting the position of the sliding block (3), and the upper and lower amplitude adjusting component (4) changes the eccentric degree of the main shaft (1) in the first through hole (31) by adjusting the position of the sliding block (3) relative to the main shaft (1);

the vertical amplitude adjusting assembly (4) comprises a vertical adjusting sleeve (41), the vertical adjusting sleeve (41) is sleeved on the main shaft (1), and the vertical adjusting sleeve (41) penetrates through the first through hole (31); adjusting collar (41) is equipped with second through-hole (411) from top to bottom, the inner wall of second through-hole (411) is equipped with two first glide plane (412) that are parallel to each other, the outer wall of main shaft (1) corresponds first glide plane (412) are equipped with two second glide plane (11) that are parallel to each other, the first glide plane (412) of adjusting collar (41) from top to bottom can paste and lean on the second glide plane (11) of main shaft (1) slide, in order to adjust main shaft (1) for the eccentric degree of first through-hole (31).

2. The feed dog adjusting mechanism according to claim 1, wherein the vertical amplitude adjusting assembly (4) further comprises a vertical driving wheel (42) and a vertical driving sliding sleeve (43), and the main shaft (1) is sequentially inserted into the vertical adjusting sleeve (41), the vertical driving sliding sleeve (43) and the vertical driving wheel (42); a second sliding groove (413) is formed in one end, far away from the cloth feeding tooth rack (2), of the upper and lower adjusting sleeve (41), the upper and lower driving sliding sleeve (43) is slidably arranged in the second sliding groove (413), and the sliding direction of the upper and lower driving sliding sleeve (43) in the second sliding groove (413) is not parallel to the sliding direction of the upper and lower adjusting sleeve (41) on the main shaft (1); one end of the upper and lower driving wheels (42) close to the cloth feeding tooth rack (2) is provided with a first eccentric part (421), the first eccentric part (421) and the main shaft (1) are eccentrically arranged, and an upper and lower driving sliding sleeve (43) is sleeved outside the first eccentric part (421).

3. The feed dog adjusting mechanism according to claim 2, wherein a catching groove (422) is provided on an outer circumferential side of the upper and lower driving wheels (42), the catching groove (422) being used for an external tool to be inserted to fix the upper and lower driving wheels (42).

4. The feed dog adjusting mechanism according to claim 2, wherein the up-down amplitude adjusting assembly (4) further comprises an up-down moving sliding sleeve (44) and an up-down ratchet wheel (46), the main shaft (1) is further arranged through the up-down moving sliding sleeve (44) and the up-down ratchet wheel (46), and the up-down ratchet wheel (46) is fixedly arranged on the main shaft (1); a third sliding groove (423) is formed in one end, far away from the cloth feeding tooth frame (2), of the upper and lower driving wheel (42), and the up-and-down moving sliding sleeve (44) is arranged in the third sliding groove (423) in a sliding mode; the up-down moving sliding sleeve (44) is arranged on the outer peripheral side of the upper ratchet wheel (46) and the lower ratchet wheel (46), an upper pawl (45) and a lower pawl (45) are fixedly arranged on the inner wall of one side of the up-down moving sliding sleeve (44), and the up-down moving sliding sleeve (44) slides in the third sliding groove (423) to enable the upper pawl (45) and the lower pawl (45) to be meshed with or separated from the upper ratchet wheel (46).

5. The feed dog adjustment mechanism according to claim 4, wherein the up-down amplitude adjustment assembly (4) further comprises an up-down return spring (47), one end of the up-down return spring (47) is connected to the up-down drive wheel (42) and the other end abuts against a side of the up-down pawl (45) away from the up-down ratchet wheel (46), so that the up-down pawl (45) of the up-down sliding sleeve (44) has a tendency to move towards the up-down ratchet wheel (46) and to engage with the up-down ratchet wheel (46).

6. The feed dog adjusting mechanism according to claim 5, wherein a limiting groove (451) is formed in one side of the upper and lower pawls (45) away from the upper and lower ratchet wheels (46), and the upper and lower return springs (47) comprise torsion springs; the middle part of the torsion spring is rotatably connected with the upper and lower driving wheels (42) through a short pin (48); one end of the torsion spring is fixedly connected with the upper and lower driving wheels (42); the other end of the torsion spring is abutted against the limiting groove (451).

7. The feed dog adjusting mechanism according to claim 1, characterized in that the feed dog (2) adjusting mechanism further comprises a front and rear amplitude adjusting assembly (5) and a transmission mechanism, the main shaft (1) is sequentially inserted through the upper and lower amplitude adjusting assembly (4) and the front and rear amplitude adjusting assembly (5); the transmission mechanism is connected with the front and rear amplitude adjusting component (5) and the feed dog frame (2), so that the front and rear amplitude adjusting component (5) can drive the feed dog frame (2) to move along the front and rear directions through the transmission mechanism.

8. Feed dog adjustment mechanism according to claim 7, characterized in that the fore-aft amplitude adjustment assembly (5) comprises:

the fixed wheel (51) is connected with the upper and lower amplitude adjusting assembly (4) in a clamping manner;

one end of the large eccentric wheel (52) is connected with the fixed wheel (51), and the other end of the large eccentric wheel (52) is provided with a second eccentric part (521);

a bearing (53) sleeved on the second eccentric part (521);

a front and rear output link (54) sleeved on the bearing (53);

one end of the front and rear driving wheel (55) is provided with a third eccentric part (551), the third eccentric part (551) is arranged on the second eccentric part (521) in a penetrating way, and the other end of the front and rear driving wheel (55) is provided with a fourth sliding chute (552);

the front-back moving sliding sleeve (56) is slidably arranged in the fourth sliding groove (552), and a front pawl and a rear pawl (57) are fixedly arranged on the inner wall of one side of the front-back moving sliding sleeve (56);

the front ratchet wheel and the rear ratchet wheel (58) are fixedly arranged on the main shaft (1), the front-back moving sliding sleeve (56) is arranged on the outer peripheral side of the front ratchet wheel and the rear ratchet wheel (58), and the front-back moving sliding sleeve (56) slides in the fourth sliding groove (552) to enable the front pawl (57) and the rear pawl (58) to be meshed or separated; and

and a front and rear return spring (59) having one end connected to the front and rear drive wheels (55) and the other end abutting against a side of the front and rear pawls (57) away from the front and rear ratchet wheels (58) so that the front and rear pawls (57) have a tendency to move toward the front and rear ratchet wheels (58) and to engage with the front and rear ratchet wheels (58).

9. An overlock machine, characterized in that it comprises a feed dog adjustment mechanism according to any one of claims 1 to 8.