CN114635233B - Joint debugging mechanism, sewing machine and sewing machine joint debugging method - Google Patents

Joint debugging mechanism, sewing machine and sewing machine joint debugging method Download PDF

Info

Publication number
CN114635233B
CN114635233B CN202110936969.XA CN202110936969A CN114635233B CN 114635233 B CN114635233 B CN 114635233B CN 202110936969 A CN202110936969 A CN 202110936969A CN 114635233 B CN114635233 B CN 114635233B
Authority
CN
China
Prior art keywords
joint
crank
transmission assembly
differential
adjustment
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202110936969.XA
Other languages
Chinese (zh)
Other versions
CN114635233A (en
Inventor
朱赛瑞
芈韶雷
徐永明
赵林蔚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jack Technology Co Ltd
Original Assignee
Jack Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jack Technology Co Ltd filed Critical Jack Technology Co Ltd
Publication of CN114635233A publication Critical patent/CN114635233A/en
Application granted granted Critical
Publication of CN114635233B publication Critical patent/CN114635233B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B27/00—Work-feeding means
    • D05B27/02—Work-feeding means with feed dogs having horizontal and vertical movements
    • D05B27/08—Work-feeding means with feed dogs having horizontal and vertical movements with differential feed motions

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)

Abstract

The invention relates to a joint debugging mechanism, a sewing machine and a sewing machine joint debugging method. A joint debugging mechanism for adjusting a feed dog frame in a sewing machine, the joint debugging mechanism comprising: the joint adjustment crank can adjust the rotation angle; the first end of the joint adjustment crank is connected with the differential quantity adjusting mechanism and adjusts the movement differential quantity between the differential feed tooth frame and the active feed tooth frame; the second end of the joint debugging crank is selectively connected with the transmission assembly, the joint debugging crank releases the locking state between the transmission assembly and the main shaft, and the eccentric amount between the transmission assembly and the main shaft can be changed by adjusting the angle of the main shaft so as to adjust the movement amplitude of the feed dog frame. The sewing machine is provided with the joint adjustment mechanism, so that the adjustment of the difference between the two feed dog holders and the whole movement amplitude of the feed dog holders can be adjusted only by arranging one driving piece, the adjustment precision and convenience are improved, the production cost is reduced, and the possibility is provided for the development of the whole miniaturization of the sewing machine.

Description

Joint debugging mechanism, sewing machine and sewing machine joint debugging method
Technical Field
The invention relates to the technical field of sewing machine equipment, in particular to a joint debugging mechanism, a sewing machine and a sewing machine joint debugging method.
Background
Aiming at different processes and product patterns, the flatness of the cloth to be sewn is different, some of the cloth to be sewn is flat, and some of the processes are required to be sewn to be provided with folds, so that the motion amounts of the main feed teeth and the differential teeth in the sewing machine are required to be adjusted, namely the motion difference of the differential feed teeth frame and the active teeth frame in the feed teeth frame is adjusted, and the required stitch length and flatness are obtained.
When the sewing machine is used for sewing different fabrics, the required stitch length is different so as to keep the sewing evenness, so that the whole fabric feeding speed of the fabric feeding teeth, namely the whole motion amplitude of the fabric feeding tooth frame, is required to be adjusted, and the required stitch length is obtained.
The sewing machine adjusts the motion trail of the feed dog through adjusting the motion trail of the feed dog, namely adjusting the motion trail of the feed dog connected with the feed dog, so that the sewing machine can meet the sewing requirements of different fabrics. The existing adjusting mechanism of the feed dog frame needs manual adjustment by manpower, the adjusting process is complex, and the convenient and low-cost development of the sewing machine is not facilitated.
Disclosure of Invention
In view of the foregoing, there is a need for an improved joint debugging mechanism, sewing machine, and joint debugging method. The sewing machine is provided with the joint adjustment mechanism, so that the adjustment of the difference between the two feed dog holders and the whole movement amplitude of the feed dog holders can be adjusted only by arranging one driving piece, the adjustment precision and convenience are improved, the production cost is reduced, and the possibility is provided for the development of the whole miniaturization of the sewing machine.
The joint debugging mechanism is used for adjusting a feed dog frame in a sewing machine, the sewing machine comprises a main shaft, a feed mechanism and a differential motion adjusting mechanism, the feed mechanism comprises the feed dog frame and a transmission assembly, the transmission assembly is in locking connection with the main shaft and operates under the action of the main shaft, the active feed dog frame and the differential feed dog frame of the feed dog frame are connected with the transmission assembly, and the main shaft drives the feed dog frame to operate through the transmission assembly; the differential quantity adjusting mechanism is connected with the differential feed tooth frame and is used for adjusting the movement difference between the differential feed tooth frame and the active feed tooth frame;
the joint debugging mechanism comprises:
the joint adjustment crank can adjust the rotation angle;
the first end of the joint adjustment crank is connected with the differential quantity adjusting mechanism and adjusts the movement differential quantity between the differential feed tooth frame and the active feed tooth frame under the rotation action;
the second end of the joint debugging crank is selectively connected with the transmission assembly under the rotation action, the joint debugging crank releases the locking state between the transmission assembly and the main shaft, and the eccentric amount between the transmission assembly and the main shaft can be changed by adjusting the angle of the main shaft, and the movement amplitude of the feed dog frame is adjusted.
Further, an unlocking bayonet lock is fixedly arranged at the second end of the joint debugging crank, and the unlocking bayonet lock is used for extending into the transmission assembly and releasing the locking state between the transmission assembly and the main shaft.
Further, the joint debugging mechanism further comprises a joint debugging driving piece, wherein the joint debugging driving piece drives the joint debugging crank to rotate and controls the rotation angle of the joint debugging crank.
Further, the joint debugging mechanism further comprises a joint debugging transmission assembly, the joint debugging transmission assembly is arranged between the joint debugging crank and the joint debugging driving piece, and the joint debugging driving piece drives the joint debugging crank to rotate through the joint debugging transmission assembly.
Further, the joint modulation transmission assembly comprises:
the driving screw rod is connected to the output shaft of the joint adjustment driving piece and rotates along with the output shaft;
the sliding screw is sleeved on the driving screw rod and connected with the joint adjustment crank;
the driving screw rod drives the joint adjustment crank to rotate through the sliding screw nut.
Further, the joint modulation transmission assembly further comprises:
the fixed seat is fixed with the joint adjustment driving piece and is used for installing the driving screw rod;
the rotating fork is embedded in the joint adjustment crank and drives the joint adjustment crank to rotate along the rotating axis of the joint adjustment crank;
The fixed seat is provided with a first slideway; the rotating fork is provided with a mounting groove; one end of the sliding screw is sleeved on the driving screw rod, and the other end of the sliding screw sequentially extends into the first slideway and the mounting groove;
the driving screw rod drives the sliding screw nut to slide along the first slideway under the action of the joint adjustment driving piece and drives the rotating fork to swing around the rotating axis of the joint adjustment crank so as to enable the joint adjustment crank to rotate.
Further, the joint adjustment crank comprises a first rod and a second rod which are arranged in a split mode, the first rod comprises the first end, and the first rod is hinged to a shell of the sewing machine; the second rod comprises a second end and is hinged to the shell of the sewing machine; the joint adjustment transmission assembly is arranged between the first rod and the second rod; the joint adjustment transmission assembly can drive the first rod and the second rod to rotate around the hinge point respectively.
Further, the joint adjustment transmission assembly comprises a first cam and a second cam, one end of the first cam is eccentrically connected with the first rod, and the other end of the first cam is connected with the output end of the joint adjustment driving piece; the second cam and the second rod are coaxially hinged to the shell, and are abutted against the first cam, and the second rod rotates around the hinge point along with the second cam;
The joint adjustment driving piece drives the first cam, can drive the first rod to rotate around the hinge point, and drives the second rod to rotate around the hinge point through cooperation between the first cam and the second cam.
Further, the first rod is provided with a second slideway, the joint adjustment transmission assembly further comprises a joint adjustment driving sliding block, and the joint adjustment driving sliding block is arranged in the second slideway; the first cam comprises a first eccentric shaft, a second eccentric shaft and a cam part, the first eccentric shaft and the second eccentric shaft are respectively fixed on two end surfaces of the cam part,
the first eccentric shaft is connected to the output end of the joint adjustment driving piece, the second eccentric shaft is fixed to the joint adjustment driving sliding block, and the cam part is propped against the second cam;
the first eccentric shaft drives the sliding block to drive the first rod to swing around the hinge point through the joint adjustment.
Further, the joint adjustment transmission assembly further comprises an elastic connecting piece, the elastic connecting piece is installed between the second cam and the second rod, the second cam drives the second rod to rotate around a hinge point through the elastic connecting piece, and the elastic connecting piece provides acting force for resetting of the second rod.
In one embodiment of the present invention, there is further provided a sewing machine including a main shaft, a cloth feeding mechanism, and a differential amount adjusting mechanism, and further including the joint adjusting mechanism according to any one of the above.
Further, the differential-amount adjusting mechanism includes:
the differential connecting piece, the first end of differential connecting piece with the joint debugging crank is connected, the second end of differential connecting piece rotates to be connected on the differential feed dog frame, the differential connecting piece is followed the joint debugging crank is around joint debugging crank's axis of rotation swings to adjust the second end of differential connecting piece in the position on the differential feed dog frame, and adjust the swing range of differential feed dog frame.
Further, the differential feed dog frame is further provided with a chute along the first direction, the chute comprises a differential adjusting section and a bayonet lock unlocking section, and the joint adjustment crank can drive the differential connecting piece to move to a position corresponding to one of the differential adjusting section and the bayonet lock unlocking section;
when the differential connecting piece corresponds to the differential adjusting section, a preset interval is reserved between the joint adjusting crank and the transmission assembly, so that the transmission assembly is in an operable state;
When the differential connecting piece corresponds to the bayonet lock unlocking section, the joint adjustment crank is contacted with the transmission assembly, and the locking state between the transmission assembly and the main shaft can be released.
Further, the transmission assembly comprises a first transmission assembly and a cloth feeding shaft, the first transmission assembly is connected to the main shaft in a locking mode, one end of the cloth feeding shaft is connected to the first transmission assembly, and the other end of the cloth feeding shaft is connected to the cloth feeding tooth frame;
the second end of the joint adjustment crank is selectively connected with the first transmission assembly under the rotation action, the locking state between the first transmission assembly and the main shaft is relieved, and the eccentric amount between the first transmission assembly and the main shaft can be changed by adjusting the angle of the main shaft so as to adjust the movement amplitude of the feed dog frame.
The embodiment of the invention also provides a joint debugging method of the sewing machine, which comprises the following steps:
controlling the first end of the joint adjustment crank to rotate to a first preset angle so as to adjust the movement difference between the differential feed dog frame and the active feed dog frame;
recording the position of the current joint debugging crank at the first preset angle;
controlling the joint adjustment crank to rotate to a second preset angle, and enabling the second end of the joint adjustment crank to be unlocked from the locking state between the transmission assembly and the main shaft;
Driving the main shaft to rotate, and changing the eccentric amount between the transmission component and the main shaft to adjust the movement amplitude of the feed dog frame;
and turning the joint adjustment crank to the position of the first preset angle.
Further, the main shaft is provided with an angle sensor for acquiring main shaft position data, and before the step of controlling the joint adjustment crank to rotate to a second preset angle, the method further comprises the following steps:
and driving the main shaft to a preset position so that a transmission assembly connected with the main shaft is aligned with the joint adjustment crank.
Drawings
FIG. 1 is a schematic view of a sewing machine according to an embodiment of the present invention, wherein parts of the sewing machine are omitted;
FIG. 2 is a schematic view of the structure of a main shaft in the sewing machine shown in FIG. 1;
FIG. 3 is a schematic view of a cloth feeding mechanism of the sewing machine shown in FIG. 1;
FIG. 4 is a schematic view showing a cloth feeding mechanism of the sewing machine of FIG. 1 in a disassembled state;
FIG. 5 is a schematic view illustrating the eccentric cam of the feed mechanism of FIG. 4 in a disassembled state;
FIG. 6 is a schematic view of the feed mechanism of FIG. 3 from another perspective;
FIG. 7 is a schematic view illustrating a disassembly of the feed mechanism shown in FIG. 6;
FIG. 8 is a schematic view of the sewing machine of FIG. 1, wherein parts of the feed mechanism and the differential adjusting mechanism are omitted;
FIG. 9 is a schematic view of a sewing machine according to another embodiment of the present invention with parts omitted;
FIG. 10 is a schematic view of a part of the sewing machine of FIG. 9 with parts omitted;
FIG. 11 is a schematic view showing a disassembly of the joint debugging mechanism in the sewing machine shown in FIG. 9;
FIG. 12 is a schematic view of a sewing machine according to another embodiment of the present invention with parts omitted;
FIG. 13 is a schematic view of the sewing machine of FIG. 12 shown in an exploded view with parts omitted;
FIG. 14 is a schematic view of a first cam of the joint transmission assembly of FIG. 13;
FIG. 15 is a schematic view of a sewing machine according to an embodiment of the present invention, showing a stitch length adjusting mechanism according to an embodiment;
fig. 16 is a schematic view of the structure shown in fig. 15 with further omission of some elements;
FIG. 17 is a schematic view of a sewing machine according to an embodiment of the present invention, showing a stitch length adjusting mechanism according to another embodiment;
FIG. 18 is a front view of an eccentric cam in the drive assembly showing the configuration of the slot of one embodiment;
FIG. 19 is a schematic view of an embodiment of an unlocking detent.
Description of element reference numerals
100. A sewing machine; 20. a main shaft; 21. a spindle drive; 22. an eccentric shaft section; 30. a cloth feeding mechanism; 31. a feed dog frame; 311. an active feed dog frame; 312. differential feed dog holders; 313. a feed dog; 3131. an active tooth; 3132. differential teeth; 314. an oil baffle plate; 315. a guide rail; 316. an extension arm; 317. a chute; 318. a sliding groove; 40. a transmission assembly; 41. a first transmission assembly; 411. a vertical driving slide block; 412. an eccentric wheel; 413. a feeding connecting rod; 414. an eccentric cam; 4141. pawl sheet; 4142. a rotating groove; 4143. a clamping groove; 415. a ratchet wheel; 42. a second transmission assembly; 421. a cloth feeding shaft; 422. a differential cloth feeding crank; 423. a connecting block; 424. a cover plate; 425. laterally driving the slider; 43. a third transmission assembly; 431. an active cloth feeding crank; 432. a connecting rod; 50. a differential amount adjusting mechanism; 51. differential connection sheets; 60. a joint debugging mechanism; 61. a joint debugging crank; 611. a first end; 612. a second end; 6121. unlocking the bayonet lock; 61211. an inclined plane; 613. a first lever; 6131. a second slideway; 614. a second lever; 62. a joint debugging driving piece; 63. 63a, a joint debugging transmission assembly; 631. driving a screw rod; 632. a sliding nut; 633. an adjusting shaft; 6331. a mounting groove; 634. rotating the fork; 635. a fixing seat; 6351. a first slideway; 636. a buckle; 637. a coupling; 641. a first cam; 6411. a cam section; 6412. a first eccentric shaft; 6413. a second eccentric shaft; 642. a joint adjustment driving sliding block; 643. a second cam; 644. an elastic connection member; 65. an eccentric wheel; 66. a linkage member; 661. a connection part; 662. a sliding fit portion; 6621. a sliding fit groove; 671. a pressing member; 672. a fixing member; 681. a drive crank; 682. a drive link; 683. and a driven connecting rod.
The foregoing general description of the invention will be described in further detail with reference to the drawings and detailed description.
Detailed Description
The present invention will be further described in detail with reference to the drawings and the detailed description, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the detailed description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the invention.
It is noted that when an element is referred to as being "mounted to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements 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. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
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. The term "or/and" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, fig. 1 is a schematic diagram of a sewing machine 100 according to an embodiment of the invention, wherein part of the elements are omitted. The invention provides a sewing machine which is used for sewing cloth with different materials. The sewing machine of the present invention may be any type of sewing machine, such as an overedger or a flush joint machine.
The sewing machine 100 provided by the invention comprises a shell (not shown), a main shaft 20 and a cloth feeding mechanism 30, wherein the main shaft 20 is arranged in the shell and connected with the cloth feeding mechanism 30, and the cloth feeding mechanism 30 is arranged in the shell.
The shell is used for bearing the main shaft 20 and the cloth feeding mechanism 30, the main shaft 20 is connected to the main shaft driving piece 21 and can drive the cloth feeding mechanism 30 to operate under the driving of the main shaft driving piece 21, the cloth feeding mechanism 30 is used for conveying cloth to be processed, and the machine head is used for sewing the cloth conveyed by the cloth feeding mechanism 30. The cloth feeding mechanism 30 is driven by the main shaft 20 to reciprocally transport the cloth.
Of course, in addition to the above-mentioned housing, main shaft 20 and cloth feeding mechanism 30, auxiliary mechanisms such as a presser foot mechanism, a thread passing mechanism, a lubrication mechanism and a machine head are further provided in the sewing machine 100 to achieve smooth completion of the sewing process of the overedger, which will not be described herein.
The position of the shell corresponding to the main shaft 20 is provided with a main shaft hole, and the main shaft hole is used for installing the main shaft 20; a cavity for accommodating the spindle driver 21 is also provided in the housing, and is communicated with the spindle hole. The medial portion of the side of the housing is concave and forms a working space that provides the active area of the feed mechanism 30 such that the feed mechanism 30 can reciprocate within the area of the working space to continuously feed the material to the handpiece. The shell is also provided with a needle plate for sewing cloth, the needle plate is approximately a flat plate, the upper surface of the needle plate is a cloth bearing surface, namely a working plane for sewing and serging operation, the cloth feeding mechanism 30 moves reciprocally and elliptically in the working space, so that the needle plate is continuously lifted above the working plane or falls below the working plane, the cloth can be dragged in the lifting process of the cloth feeding mechanism 30, the position of the needle plate can be reset in the descending process, and the cloth feeding mechanism 30 can be lifted and lowered repeatedly and continuously.
Referring to fig. 2, fig. 2 is a schematic structural view of a main shaft 20 in the sewing machine 100 shown in fig. 1. The main shaft 20 is inserted into a main shaft hole formed in the casing, and the main shaft 20 can rotate under the drive of the main shaft driving member 21 and drive each actuator in the sewing machine 100 to operate. The main shaft 20 has a central axis X, the main shaft 20 can rotate around its central axis X, and the position of the central axis X is fixed relative to the housing, that is, the main shaft 20 does fixed-axis rotation around the central axis X.
The main shaft 20 comprises an eccentric shaft section 22 which is eccentrically arranged so as to be connected with a transmission mechanism (not shown) of the eccentric shaft section 22, the rotation of the main shaft 20 drives the eccentric shaft section 22 to eccentrically rotate around a central axis X, and the eccentric rotation of the eccentric shaft section 22 transmits power to each executing mechanism through the transmission mechanism, so that the driving operation of the executing mechanism is realized; the power transmission of the eccentric shaft segments 22 on the main shaft 20 also realizes the operation and coordination of different execution mechanisms in the sewing machine 100.
Referring to fig. 3, fig. 3 is a schematic structural view of a cloth feeding mechanism 30 in the sewing machine 100 shown in fig. 1. The cloth feeding mechanism 30 comprises a cloth feeding tooth frame 31 and a transmission assembly 40, wherein the transmission assembly 40 comprises a first transmission assembly 41, a second transmission assembly 42 and a third transmission assembly 43. The number of the feed dog holders 31 is two, namely an active feed dog holder 311 and a differential feed dog holder 312, the first transmission component 41 is connected with the active feed dog holder 311 and the differential feed dog holder 312, and the first transmission component 41 is eccentrically matched with the main shaft 20 and drives the active feed dog holder 311 and the differential feed dog holder 312 to reciprocate in a linear motion in a first direction; the second transmission assembly 42 is arranged between the first transmission assembly 41 and the differential feed dog frame 312, and the second transmission assembly 42 can drive the differential feed dog frame 312 to reciprocate in a linear motion in a second direction under the drive of the first transmission assembly 41; the third transmission assembly 43 is disposed between the second transmission assembly 42 and the active feeding tooth frame 311, and the third transmission assembly 43 can drive the active feeding tooth frame 311 to reciprocate in the second direction under the driving of the second transmission assembly 42.
In this embodiment, the first direction is a vertical direction, and the second direction is a horizontal direction perpendicular to the vertical direction. It will be appreciated that the first direction may also be other directions inclined to the vertical and the second direction may also be other directions inclined to the horizontal; the first direction and the second direction can be mutually perpendicular, can also take other angles, and the first direction and the second direction can be correspondingly arranged according to actual production needs.
The active feed dog 311 is driven by the first transmission component 41 to reciprocate in a first direction, and driven by the second transmission component 42 to reciprocate in a second direction, so that the movements of the active feed dog 311 in the two directions are overlapped and are expressed as a reciprocating circular movement in space.
The motion form of the differential feed dog frame 312 is similar to that of the active feed dog frame 311, the differential feed dog frame 312 is driven by the first transmission assembly 41 to reciprocate in a first direction and is driven by the third transmission assembly 43 to reciprocate in a second direction, and the motions of the differential feed dog frame 312 in the two directions are overlapped and are expressed as reciprocating circular motions in space.
Since the dragging stroke of the active feed dog 311 and the differential feed dog 312 to the cloth in the second direction is often larger than the moving stroke of the feed dog 31 in the first direction, the reciprocating circular motion of the active feed dog 311 and the differential feed dog 312 is relatively larger in the lateral upward stroke, and the stroke in the first direction is relatively smaller, and the active feed dog 311 and the differential feed dog 312 are spatially represented as elliptical motion in a reciprocating manner.
The motion of the active feed dog 311 and the differential feed dog 312 after being higher than the working plane can drag the cloth, the motion after falling into the working plane can reset the dragging position of the active feed dog 311 and the differential feed dog 312, the reciprocating elliptical motion of the active feed dog 311 and the differential feed dog 312 can be matched with the motion of the machine head, the active feed dog 311 and the differential feed dog 312 convey the cloth into the machine head, the machine head performs sewing processing on the current cloth segment after the active feed dog 311 and the differential feed dog 312 feed, and the feed dog 31 continues dragging the next cloth segment after the machine head finishes processing on the current cloth, so that the cycle is circulated and continuous operation is realized.
The feed dog frame 31 is provided with a feed dog 313 for dragging the cloth, the feed dog 313 can pass through the needle plate under the drive of the reciprocating elliptical motion of the feed dog frame 31 and is matched with a presser foot plate in the presser foot mechanism, the feed dog 313 compresses the cloth by mutually supporting the presser foot plate and moving in the first direction, and the cloth is dragged by moving in the second direction. The feed dog 313 comprises a drive dog 3131 arranged on the drive dog frame 311 and a differential dog 3132 arranged on the differential dog frame 312, the drive dog frame 311 is provided with a drive dog 3131 for dragging cloth, and the drive dog 3131 is provided with a serrated surface to increase the dragging force on the cloth; the differential feed dog frame 312 is provided with differential dogs 3132 for dragging the cloth, and the differential dogs 3132 are also provided with serrated surfaces to increase the dragging force on the cloth. The driving teeth 3131 and the differential teeth 3132 are arranged at intervals, a gap between the driving teeth 3131 and the differential teeth 3132 is used for providing a processing space of a machine head on the machine head, and the machine head can process cloth at the gap between the driving teeth 3131 and the differential teeth 3132, so that sewing operation is completed.
In the present embodiment, the active feed dog 311 and the differential feed dog 312 are relatively synchronized in movement in the first direction, and are not synchronized in movement in the second direction, so that the sewing machine 100 obtains a better sewing effect. Of course, the active feed dog 311 and the differential feed dog 312 may also move synchronously.
In order to ensure the stability and reliability of the active feed dog 311 and the differential feed dog 312 in the feed process, the casing is further provided with an oil baffle 314 and a guide rail 315 for matching the movement of the active feed dog 311 and the differential feed dog 312, the oil baffle 314 is approximately shaped like a Chinese character 'kou', and the active feed dog 311 and the differential feed dog 312 pass through a central hole of the oil baffle 314 and act within the space range of the central hole. It will be appreciated that in order to ensure smooth movement of the active feed dog 311 and the differential feed dog 312, the aperture of the central aperture of the oil baffle 314 is matched with the dimensions and movement of the active feed dog 311 and the differential feed dog 312. The two sides of the oil baffle 314 are correspondingly contacted with the sides of the active feed dog 311 and the differential feed dog 312, and the sides of the oil baffle 314 can scrape the lubricating oil on the active feed dog 311 and the differential feed dog 312, so that the problems of cloth pollution and the like caused by direct contact between the flow of the lubricating oil infiltration and the cloth are avoided.
The guide rail 315 is approximately concave, is fixedly arranged at the housing and is nested in the active feed dog 311 and the differential feed dog 312, and the guide rail 315 is used for improving the stability of the movement of the active feed dog 311 and the differential feed dog 312 and avoiding the movement deviation of the active feed dog 311 and the differential feed dog 312.
The active feed dog 311 and the differential feed dog 312 are further provided with a plurality of through holes (not numbered), and the through holes are used for oiling, so that not only can the lubricating oil on the feed dog 31 be conveniently soaked, but also the active feed dog 311 and the differential feed dog 312 can be lightened, and the weight of the whole sewing machine 100 can be reduced.
The end of the active feed dog 311 far away from the active dog 3131 and the end of the differential feed dog 312 far away from the differential dog 3132 are extended outwards to form two parallel extension arms 316, a sliding groove 318 extending along the length direction of the feed dog 31 is formed between the two parallel extension arms 316, and the two extension arms 316 parallel to each other are used for adjusting the overall angle of the feed dog 31.
The active feed dog 311 and the differential feed dog 312 are provided with a chute (not numbered) in a shape of a Chinese character 'kou' at a substantially middle position, and the chute is used for being matched with the first transmission component 41 so that the first transmission component 41 drives the active feed dog 311 and the differential feed dog 312 to do reciprocating linear motion in a first direction.
In addition, the differential feed dog frame 312 is further provided with a sliding groove 317 along the first direction, and the sliding groove 317 is used for embedding and sliding a part of the structure of the second transmission assembly 42, so as to realize the reciprocating linear motion of the differential feed dog frame 312 in the second direction. The active feed dog 311 is further provided with a through hole (not numbered) for connecting and embedding the third transmission assembly 43, so as to realize the interconnection between the third transmission assembly 43 and the active feed dog 311.
Referring to fig. 4, fig. 4 is a schematic diagram illustrating a disassembly of the cloth feeding mechanism 30 in the sewing machine 100 shown in fig. 1. The first transmission component 41 is sleeved on the main shaft 20 and connected to the active feed dog 311 and the differential feed dog 312, and the first transmission component 41 is used for transmitting kinetic energy of the main shaft 20 and driving the active feed dog 311 and the differential feed dog 312 to reciprocate in a linear motion along a first direction.
The first transmission assembly 41 includes a vertical driving slider 411, an eccentric wheel 412, and a feeding connecting rod 413, where the vertical driving slider 411 is used to drive the active feed dog 311 and the differential feed dog 312 to reciprocate along a first direction, and the eccentric wheel 412 is matched with the feeding connecting rod 413 to drive the second transmission assembly 42 to operate.
The vertical driving slide 411 is substantially block-shaped, and a through hole is formed in the substantially center of the vertical driving slide 411, and the vertical driving slide 411 is sleeved at one eccentric shaft section 22 of the main shaft 20 through the through hole. The vertical driving sliding block 411 is embedded in the central chute of the 'mouth' -shaped feed dog frame 31 and contacts with the inner side wall of the feed dog frame 31, and the rotation of the main shaft 20 around the central axis of the main shaft can make the eccentric shaft section 22 eccentrically rotate, so that the vertical driving sliding block 411 sleeved on the eccentric shaft section 22 is driven to do parallel rotation in the circumferential direction. Since the vertical driving slider 411 is disposed at the chute formed inside the feed dog 31, the vertical driving slider 411 will slide reciprocally along the chute under the guidance of the chute 317, that is, the motion of the vertical driving slider 411 in the lateral direction is released by the chute inside the feed dog 31, and the vertical driving slider 411 only drives the feed dog 31 to reciprocate in the first direction, so as to realize the process of driving the feed dog 31 by the spindle 20 to reciprocate along the first direction.
The eccentric wheel 412 and the feeding connecting rod 413 are sequentially sleeved on the main shaft 20, and the eccentric wheel 412 and the feeding connecting rod 413 are mutually matched and used for driving the second transmission assembly 42 to move, so that a power source is provided for the second transmission assembly 42 to drive the active feed dog frame 311 and the differential feed dog frame 312 to reciprocate in the lateral direction. Eccentric wheel 412 is fixed on main shaft 20 and can rotate under the drive of main shaft 20; one end of the feeding connecting rod 413 is sleeved on the eccentric wheel 412 and is rotationally connected with the eccentric wheel 412, and the other end is connected with the second transmission assembly 42. The eccentric wheel 412 is sleeved on the straight shaft section of the main shaft 20, and the rotation driving of the main shaft 20 is represented by eccentric rotation of the eccentric wheel 412 around the main shaft 20 due to the eccentric arrangement of the eccentric wheel 412; since the feeding connecting rod 413 is sleeved on the eccentric wheel 412, the driving action of the eccentric wheel 412 on the feeding connecting rod 413 is represented by the turnover motion of the feeding connecting rod 413, and the eccentric wheel 412 and the feeding connecting rod 413 form a crank-rocker mechanism, so that the second transmission assembly 42 is driven to swing in a reciprocating manner.
Referring to fig. 5, fig. 5 is a schematic exploded view of the eccentric cam 414 in the feed mechanism 30 shown in fig. 4.
In this embodiment, the first transmission assembly 41 further includes an eccentric cam 414, a pawl plate 4141 disposed on the eccentric cam 414, and a ratchet 415; the ratchet 415 is disposed at an end of the main shaft 20 relatively close to the eccentric cam 414, and is fixed to the main shaft 20. The ratchet 415 is adapted to intermesh with the pawl plate 4141. The relative position of the eccentric 412 and the feed link 413 on the spindle 20 is fixed by the interengagement of the pawl tab 4141 of the eccentric cam 414 with the ratchet 415.
The pawl 4141 is generally kidney-shaped and has a slide hole (not shown) formed in the middle thereof for sliding along the radial direction of the spindle 20. The pawl plate 4141 is reciprocally slidably disposed within the kidney-shaped rotation groove 4142 of the eccentric cam 414 by a spring (not shown). The eccentric cam 414 is mounted with the pawl plate 4141 over the spindle 20 and adjacent the feed link 413. The spring is used to return the pawl plate 4141 and can act on the pawl plate 4141 to cause the pawl plate 4141 to engage the ratchet 415. When the first transmission assembly 41 is in turn mounted on the spindle 20, the pawl plate 4141 is held against and engaged with the ratchet 415 by the spring. Correspondingly, a locking groove 4143 is formed on the outer peripheral side of the eccentric cam 414. The catch groove 4143 communicates with the rotation groove 4142, and the catch groove 4143 is used for allowing an external member to extend laterally into the slide groove 318 and push the pawl plate 4141 to slide in the rotation groove 4142.
When the external element extends into the clamping groove 4143 and abuts against the pawl plate 4141, the pawl plate 4141 overcomes the elastic force of the spring, so that the pawl plate 4141 is disengaged from the ratchet 415 and is unlocked, and the locked state between the feeding connecting rod 413 and the main shaft 20 can be unlocked, i.e. the rotation of the main shaft 20 does not drive the feeding connecting rod 413 to move. At this time, the spindle 20 can independently drive the eccentric wheel 412 to rotate under the action of the corresponding driving motor, and the current positions of the feeding connecting rod 413 and the eccentric cam 414 are kept unchanged. Thus, the amount of eccentricity between the feed link 413 and the spindle 20 can be changed accordingly, and thus the movement amplitude of the feed dog 31 in the second direction can be changed.
Referring to fig. 4 again, one end of the second transmission assembly 42 is connected to the feeding link 413 in the first transmission assembly 41, and the other end is connected to the differential feed dog frame 312. The second transmission assembly 42 includes a cloth feeding shaft 421, a differential cloth feeding crank 422, a connecting block 423, a cover plate 424, and a lateral driving slider 425, where the cloth feeding shaft 421 is inserted through the differential cloth feeding crank 422 and mounted on the housing, and the second transmission assembly 42 can be disposed at the housing in a stable state by the bearing of the cloth feeding shaft 421. The two ends of the cloth feeding shaft 421 are also provided with shaft sleeves (not numbered), through which the cloth feeding shaft 421 is fixedly arranged on the housing and can rotate under the bearing of the housing.
The differential feed crank 422 is substantially L-shaped, a part of its short side is fixed to the feed shaft 421, the remaining part of the short side is rotatably connected to the feed link 413, and the long side extends into a cavity defined by the connection block 423 and the cover plate 424. The differential feed crank 422 is rotatably connected to the feed link 413 in the first transmission assembly 41, and the swinging of the feed link 413 drives the differential feed crank 422 to reciprocally rotate. The differential feed crank 422 is further provided with a plurality of through holes at the long side portion, and the through holes are used for oil passing, so that lubricating oil can well infiltrate the differential feed crank 422.
The connecting block 423 and the cover plate 424 are fixed with each other, and an opening for the long side of the differential cloth feeding crank 422 to extend in is formed between the connecting block 423 and the cover plate 424; the connection block 423 is provided with a protrusion (not numbered) towards the lateral driving sliding block 425, a screw hole (not numbered) is formed in the corresponding position of the connection block 423 and the cover plate 424, and the connection block 423 and the cover plate 424 can be mutually fixed through a threaded fastener.
The lateral driving sliding block 425 is embedded in the sliding groove 317 which is further formed in the differential feed dog frame 312 along the first direction, the approximate center position of the lateral driving sliding block 425 is hollow, and the hollow part of the lateral driving sliding block 425 is used for embedding the protrusion on the connecting block 423, so that the rotating connection between the connecting block 423 and the lateral driving sliding block 425 is realized.
Along with the transmission of the first transmission component 41 to the second transmission component 42, the feeding connecting rod 413 drives the differential cloth feeding crank 422 in the second transmission component 42 to swing reciprocally under the driving of the spindle 20, the differential cloth feeding crank 422 and the cloth feeding shaft 421 are fixed to each other, and at this time, the differential cloth feeding crank 422 and the cloth feeding shaft 421 swing reciprocally in an integral form. The long end of the differential feed crank 422 extends into the space surrounded by the connecting block 423 and the cover plate 424, and the swing of the differential feed crank 422 drives the connecting block 423, the cover plate 424 and the lateral driving sliding block 425 to do reciprocating swing.
Because the lateral driving sliding block 425 can slide in the sliding groove 317 of the differential feed dog frame 312, the space swing of the lateral driving sliding block 425 is respectively the reciprocating sliding of the lateral driving sliding block 425 along the sliding groove 317 and the reciprocating rectilinear motion of the lateral driving sliding block 425 in the extending direction of the vertical sliding groove 317, and because the lateral driving sliding block 425 is arranged on the differential feed dog frame 312, the reciprocating rectilinear motion of the lateral driving sliding block 425 in the extending direction of the vertical sliding groove 317 can drive the differential feed dog frame 312 to reciprocate rectilinear motion in the lateral direction vertical to the first direction, so that the process that the second transmission component 42 drives the differential feed dog frame 312 to reciprocate rectilinear motion in the lateral direction under the drive of the first transmission component 41 is realized.
By opening the slide 317, the movement of the lateral drive slider 425 in the first direction is released, and the lateral drive slider 425 will only transmit its movement in the lateral direction to the differential feed dog holder 312. It should be noted that the swing angle of the differential feed crank 422 is released by the rotational connection between the lateral driving slider 425 and the connecting block 423, so as to avoid the motion interference of the differential feed crank 422 caused by the inability to rotate.
Referring to fig. 6 and fig. 7, fig. 6 is a schematic structural diagram of the cloth feeding mechanism 30 shown in fig. 3 at another view angle; fig. 7 is a schematic exploded view of the cloth feeding mechanism 30 shown in fig. 6.
The third transmission assembly 43 comprises an active cloth feeding crank 431, a connecting rod 432 and a connecting rod sleeve 433, wherein the active cloth feeding crank 431 is sleeved on the cloth feeding shaft 421 and is in rotary connection with the connecting rod 432, the connecting rod 432 is arranged between the connecting rod sleeve 433 and the active cloth feeding crank 431, one end of the connecting rod 432 is embedded by a connecting piece (not numbered) arranged on the active cloth feeding crank 431, the other end of the connecting rod 432 is embedded by the connecting rod sleeve 433, and the connecting rod sleeve 433 penetrates through one end of the connecting rod 432 and is fixed on the active cloth feeding tooth frame 311, so that the third transmission assembly 43 and the active cloth feeding crank 431 are connected with each other.
The active feed crank 431 is provided with a chute (not numbered) which is arc-shaped and extends in a first direction, a connecting pin (not numbered) for connecting one end of the connecting rod 432 is embedded in the chute, the active feed crank 431 is connected to the connecting rod 432 through the connecting pin, and the active feed crank 431 releases a motion component in the first direction through the connecting rod 432, so that the combined motion of the active feed crank 431 in the vertical and lateral directions only transmits the lateral motion to the active feed tooth frame 311.
Through holes are formed in two opposite ends of the connecting rod 432, one of the two through holes is used for embedding the connecting rod sleeve 433, and the other is used for embedding the connecting pin on the active cloth feeding crank 431. The connecting rod 432 can drive the active feed dog 311 to reciprocate in a straight line in a lateral direction perpendicular to the first direction under the connection effect of the driving action of the active feed crank 431 and the connecting rod sleeve 433.
The cloth feeding shaft 421 connects the active cloth feeding rack 311 and the differential cloth feeding rack 312, so that the motion sources of the active cloth feeding rack 311 and the differential cloth feeding rack 312 are kept consistent, and only the initial positions or lengths of the structures in the second transmission assembly 42 and the third transmission assembly 43 need to be adjusted, so that the active cloth feeding rack 311 and the differential cloth feeding rack 312 have different motion tracks and are kept level in the vertical position.
The main shaft 20 drives the active feed dog 311 and the differential feed dog 312 to reciprocate in the first direction and the lateral direction, so that the active feed dog 311 and the differential feed dog 312 have the same driving source, which is beneficial to keeping the synchronization of the movement forms of the active feed dog 311 and the differential feed dog 312, and the problem that a plurality of driving sources respectively drive the active feed dog 311 and the differential feed dog 312 to move and cause the asynchronous vertical and lateral movement is avoided.
Of course, if synchronization is not considered, the elliptical motion of the active feed dog 311 and the differential feed dog 312 may be driven by a plurality of driving sources.
Referring to fig. 8, fig. 8 is a schematic diagram of the sewing machine shown in fig. 1, in which part of the components of the cloth feeding mechanism 30 and the differential adjusting mechanism 50 are omitted.
As shown in fig. 8, in order to implement adjustment of the difference between the active feed dog 311 and the differential feed dog 312, the sewing machine 100 is further provided with a differential adjustment mechanism 50, where the differential adjustment mechanism 50 includes a differential link 51, and one end of the differential link 51 is pivotally connected to a manual or electric control driving mechanism, and the other end is connected to a cover plate 424 in the second transmission assembly 42. The differential link 51 is capable of adjusting the position of the differential link 51 within the chute 317 under the influence of a manual or electronically controlled drive mechanism.
Because the differential link 51 is rotatably connected to the cover plate 424 in the second transmission assembly 42, the differential link 51 is driven by a manual or electric drive mechanism to rotate about the cover plate 424 and slide integrally with the cover plate 424 along the slide groove 317. The position of the lateral driving sliding block 425 fixedly connected with the connecting block 423 and the cover plate 424 in the sliding groove 317 is changed under the driving of the differential connecting piece 51, so that the movement initial position of the lateral driving sliding block 425 is changed, the movement state of the differential feed dog frame 312 is changed as the actual movement of the lateral driving sliding block 425 is decomposed in the lateral direction, and the adjustment of the difference between the active feed dog frame 311 and the differential feed dog frame 312 is realized.
Referring to fig. 9 and 10 together, fig. 9 is a schematic structural diagram of a sewing machine 100 according to another embodiment of the invention, wherein part of the elements are omitted; fig. 10 is a schematic view of a part of the sewing machine 100 shown in fig. 9, with parts omitted.
In the operation process of the existing sewing machine, the adjustment of the difference between the two feed dog holders and the adjustment of the integral movement amplitude of the feed dog holders are often independently adjusted through a plurality of adjusting mechanisms, the adjusting process is complicated, and the adjusting precision is not high. As shown in fig. 9, in order to improve the accuracy of the adjustment of the movement amplitude of the feed dog 31 and the amount of difference between the two feed dog 31 and to improve the convenience of the adjustment at the same time, the sewing machine 100 further includes a joint adjustment mechanism 60. The joint adjustment mechanism 60 can respectively adjust the position of the differential motion adjusting mechanism 50 at the differential feed dog frame 312 and change the locking state between the transmission assembly 40 and the spindle 20, so as to adjust the motion difference between the active feed dog frame 311 and the differential feed dog frame 312 and the motion amplitude of the whole feed dog frame 31, and simultaneously, the adjustment of the two can be accurately controlled, and the adjustment process can be correspondingly simplified.
The joint adjustment mechanism 60 is disposed in the housing and is connected to the transmission assembly 40 and the differential adjustment mechanism 50, respectively. The joint debugging mechanism 60 includes a joint debugging crank 61. The first end 611 of the joint adjustment crank 61 is connected to the differential volume adjustment mechanism 50, and the second end 612 can be connected to the transmission assembly 40. The joint adjustment crank 61 is adjustably connected to the joint adjustment driving member 62, and is capable of adjusting the position of the differential quantity adjusting mechanism 50 on the differential feed dog frame 312 and changing the connection relationship between the transmission assembly 40 and the spindle 20 under the action of the joint adjustment driving member 62. The joint adjustment crank 61 is used to adjust the differential amount adjusting mechanism 50 and to release the lock state between the transmission assembly 40 and the main shaft 20, respectively, and can switch the adjustment targets of the two. By the arrangement, the movement track of the feed dog 31 is flexibly and conveniently adjusted.
Through setting up joint adjustment crank 61 for the object of above-mentioned adjustment can only install an automatically controlled or manual driving piece and can realize adjusting, consequently simplified originally need set up a plurality of driving pieces and just can reach above-mentioned purpose of adjusting, corresponding reduction in production cost and installation process, and adjustment process can simplify greatly.
In one embodiment, as shown in fig. 9 and 10, the joint adjustment crank 61 is generally L-shaped, the connection between two sides of the joint adjustment crank is hinged to the housing, and the end portions relatively far from the hinge point are a first end 611 and a second end 612 respectively. Wherein the first end 611 is hinged to an end of the differential link 51 opposite to the cover 424; the second end 612 is provided with an unlocking detent 6121, and the unlocking detent 6121 can extend into the second drive assembly 42 and push the pawl plate 4141. The first end 611 is used for connecting the differential-amount adjusting mechanism 50; the second end 612 is configured to be selectively coupled to the first transmission assembly 41 and to enable a locked state between the first transmission assembly 41 and the spindle 20 to be released.
On the one hand, the rotation of the joint adjustment crank 61 can drive the differential connecting piece 51 to rotate around the hinge point through the first end 611, and the position of the lateral driving sliding block 425 in the sliding groove 317 is changed through the connecting block 423, so that the position of the lateral driving sliding block 425 fixedly connected with the connecting block 423 and the cover plate 424 in the sliding groove 317 is changed, the initial movement position of the lateral driving sliding block 425 is changed, the differential feeding tooth rack 312 is decomposed in the lateral direction as the actual movement of the lateral driving sliding block 425, and the movement state of the differential feeding tooth rack 312 is changed.
On the other hand, the rotation of the joint adjustment crank 61 drives the second end 612 to unlock the bayonet 6121, extend into the bayonet 4143 formed by the eccentric cam 414, and push the pawl plate 4141 to slide along the rotation groove 4142 of the eccentric cam 414, and release the engagement with the ratchet 415 of the main shaft 20; at this time, the spindle 20 is continuously rotated, and the position of the first transmission assembly 41 is kept at the current position, so that the phase between the first transmission assembly 41 and the spindle 20 is changed, that is, the eccentric amount between the first transmission assembly 41 and the spindle 20 is changed, so that the movement amplitude of the feed dog 31 driven by the first transmission assembly 41 along the second direction can be changed. The eccentric cam 414 and the eccentric wheel 412 together eccentrically connect the feed link 413 to the spindle 20, and at this time, rotating the spindle 20 to change the eccentric amount between the first transmission assembly 41 and the spindle 20 is actually adjusting the eccentric amount between the spindle 20 and the feed link 413, so that the swing amplitude of the two feed brackets 31 along the second direction is changed.
It will be appreciated that in other embodiments, when the eccentric cam 414 and the eccentric 412 together eccentrically connect the vertical driving slider 411 to the main shaft 20, then the adjustment of the eccentric amount between the first transmission assembly 41 and the main shaft 20 means changing the eccentric amount between the main shaft 20 and the vertical driving slider 411, thereby changing the movement amplitude of the cloth carrier 31 in the first direction. Thus, the joint adjustment crank 61 may be used to change the amplitude of movement of the cloth carrier 31 in the first direction or the second direction.
In one embodiment, the unlocking detent 6121 may be integral with the joint adjustment crank 61; or, the unlocking detent 6121 may be detachably connected to the second end 612 of the joint adjustment crank 61. The detachable connection may be a clamping connection or a threaded connection, so long as the unlocking bayonet 6121 can be fixed on the joint adjustment crank 61.
As shown in fig. 10, the sliding groove 317 includes a differential adjustment section α and a latch unlocking section β, and the rotation of the joint adjustment crank 61 can drive the differential link plate 51 to move to one of the differential adjustment section α and the latch unlocking section β.
When the joint adjustment crank 61 is moved leftward in the direction shown in fig. 10 until the unlocking detent 6121 is snapped into the detent 4143, the differential link 51 corresponds to the detent unlocking section β, i.e., the differential link 51 can correspondingly position the lateral drive slider 425 in the detent unlocking section β; at this time, the joint adjustment crank 61 contacts the transmission assembly 40, and the locking state between the transmission assembly 40 and the spindle 20 can be released. Specifically, the joint adjustment crank 61 contacts the locked state between the first transmission assembly 41 and the main shaft 20.
When the joint adjustment crank 61 is moved rightward in the direction shown in fig. 10, the differential link 51 corresponds to the differential adjustment section α, i.e., the differential link 51 can correspondingly position the lateral drive slider 425 in the differential adjustment section α; at this time, a predetermined interval is provided between the joint adjustment crank 61 and the transmission assembly 40; at this time, the differential link plate 51 can adjust the movement difference between the differential feed dog 312 and the active feed dog 311 by the rotation of the joint adjustment crank 61; and the transmission assembly 40 is in an operative state.
The predetermined interval is that the joint adjustment crank 61 and the transmission assembly 40 are not in direct contact, and a distance greater than zero is formed between the joint adjustment crank and the transmission assembly.
In one embodiment, the joint debugging mechanism 60 further includes a joint debugging drive 62. The joint debugging drive is connected to the joint debugging crank 61 and is used for electrically driving the joint debugging crank 61. Preferably, the joint adjustment drive 62 is a stepper motor, the output shaft of which is connected to the joint adjustment crank 61. So set up for joint adjustment crank 61's rotation angle can accurate control, thereby make the regulation of corresponding feed dog frame 31 also can accurate control, and be convenient for manual operation promotes sewing machine 100 whole automated control degree.
In one embodiment, the joint debugging mechanism 60 further includes joint debugging transmission assemblies 63, 63a. The joint debugging transmission components 63, 63a are disposed between the joint debugging crank 61 and the joint debugging driving piece 62 for transmitting the output power of the joint debugging driving piece 62. It will be appreciated that in other embodiments, the joint adjustment drive 62 may be directly coupled to the hinge point of the joint adjustment crank 61, and the joint adjustment transmission assembly 63 may be omitted accordingly, as in the embodiment of the sewing machine shown in fig. 1.
Referring to fig. 11, fig. 11 is a schematic exploded view of the joint adjustment mechanism 60 in the sewing machine 100 shown in fig. 9.
In one embodiment, as shown in fig. 11, the joint adjustment transmission assembly 63 includes a drive screw 631 and a sliding screw 632. The drive screw 631 is connected to the output shaft of the joint adjustment drive 62; the sliding nut 632 is sleeved on the driving screw rod 631 and can slide along the driving screw rod 631, and part of the sliding nut 632 stretches into the joint adjustment crank 61 and drives the joint adjustment crank 61 to rotate. Correspondingly, an adjusting shaft 633 is arranged at the hinge point of the joint adjusting crank 61 hinged to the shell, and a rotating fork 634 synchronously rotating with the adjusting shaft 633 is arranged on the adjusting shaft. The rotating fork 634 is fixed on the adjusting shaft 633 and is provided with a mounting groove 6331 correspondingly; the sliding nut 632 partially protrudes into the mounting slot 6331.
When the joint adjustment driving member 62 controls the driving screw rod 631 to operate, the sliding screw 632 slides along the axial direction of the driving screw rod 631 and drives the joint adjustment crank 61 to rotate around the hinge point through the rotating fork 634, so as to realize rotation of the first end 611 and/or the second end 612 of the joint adjustment crank 61 around the hinge point of the joint adjustment crank 61.
It will be appreciated that in other embodiments, the joint adjustment transmission assembly 63 may be other transmission structures, so long as the transmission of the power from the output shaft of the joint adjustment drive 62 to the joint adjustment crank is enabled.
Further, to increase the stability of installing the driving screw 631 and the sliding screw 632, the joint adjustment transmission assembly 63 further includes a fixing base 635, and the fixing base 635 and the joint adjustment driving member 62 are fixed together in the housing. The fixed base 635 has a substantially square frame structure, and has one end connected to the joint adjustment driving member 62 and the other end for engaging the driving screw 631. The driving screw 631 penetrates through the fixed base 635, one end of the driving screw is connected with the output shaft of the joint adjustment driving piece 62, and the other end of the driving screw is clamped in the fixed base 635 through the annular buckle 636, so that the driving screw can rotate relative to the fixed base 635, and the axial position of the driving screw is kept unchanged. The sliding nut 632 is substantially cylindrical and is radially sleeved on the driving screw 631. Correspondingly, a side of the fixed base 635 is provided with a first sliding rail 6351. One end of the sliding nut 632 sequentially extends into the first slideway 6351 and the mounting groove 6331 of the rotating fork 634. The first slide 6351 is used to drive the sliding nut 632 to slide in the first slide 6351.
In one embodiment, a coupling 637 is provided between the drive screw 631 and the joint adjustment drive 62 for ease of installation and to ensure connection strength, etc. The coupling 637 is used to connect the drive screw 631 and the output shaft of the joint adjustment drive 62. The provision of the coupling 637 also protects the joint adjustment drive 62 to some extent. Of course, in other embodiments, as shown, if the joint adjustment drive 62 is not connected to the joint adjustment crank 61 through the joint adjustment transmission assembly 63, the coupling 637 is directly connected to the hinge point of the adjustment shaft 633 or the joint adjustment crank 61.
Referring to fig. 12 and 13 together, fig. 12 is a schematic structural view of a sewing machine 100 according to another embodiment of the present invention, wherein part of the elements are omitted; fig. 13 is a schematic exploded view of the sewing machine 100 of fig. 12 with parts omitted.
In another embodiment of the present invention, the joint adjustment transmission assembly 63a is provided in a cam structure; correspondingly, the joint adjustment crank 61 includes a first lever 613 and a second lever 614 that are separately provided. The first rod 613 includes a first end 611 for connecting the differential link 51, and an end of the first rod 613 opposite the first end 611 is hinged to the housing; the second lever 614 includes a second end 612 that is capable of extending into the catch 4143 and pushing against the pawl tab 4141, the second lever 614 being hinged to the housing. The first rod 613 and the second rod 614 are rod-shaped members. The first lever 613 can rotate relative to the hinge point of the first lever 613 and adjust the position of the differential link 51 in the chute 317; the second lever 614 is able to extend into the catch slot 4143 and push the pawl tab 4141 and correspondingly unlock the second transmission assembly 42 from the spindle 20.
The joint adjustment transmission assembly 63a comprises a first cam 641 and a second cam 643, wherein the first cam 641 is arranged in the middle of the first rod 613 and is connected with the joint adjustment driving piece 62; the second cam 643 is disposed at an end of the second rod 614 opposite the second end 612; and the first cam 641 and the second cam 643 are abutted against each other. The first cam 641 is used for connecting the joint adjustment driving piece 62 and transmitting power thereof to the first rod 613 and the second cam 643; the second cam 643 is used to connect with the first cam 641 and rotate the second lever 614.
The joint adjustment driving piece 62 drives the first rod 613 to rotate around the hinge point of the first rod through the first cam 641, so that the aim of adjusting the differential connecting piece 51 is fulfilled; at the same time, the first cam 641 is always engaged with the second cam 643 and rotates the second lever 614 connected to the second cam 643 about its hinge point, thereby allowing the second end 612 to extend into the slot 4143 and disengage the eccentric cam 414 from the ratchet 415 of the spindle 20.
Referring to fig. 14, fig. 14 is a schematic structural view of a first cam 641 in the joint adjustment transmission assembly 63a shown in fig. 13.
Specifically, the first cam 641 includes a cam portion 6411, a first eccentric shaft 6412 connected to one end surface of the cam portion 6411, and a second eccentric shaft 6413 connected to the other end surface of the cam portion 6411. The first eccentric shaft 6412 is eccentrically disposed with the second eccentric shaft 6413. The cam 6411 is configured to abut against the outer peripheral surface of the second cam 643; the first eccentric shaft 6412 is for connecting the output shaft of the joint debugging drive 62 and outputting power to the cam portion 6411 and the second eccentric shaft 6413; the second eccentric shaft 6413 serves to transmit eccentric power from the first eccentric shaft 6412 to the first lever 613. Correspondingly, a second slide 6131 is provided at the middle position of the first lever 613. The second slide 6131 is opened along the rotation radial direction of the first lever 613. A joint adjustment driving sliding block 642 is slidably mounted in the second slideway 6131. The joint adjustment driving sliding block 642 is matched with the second slideway 6131, and drives the first rod 613 to rotate around the hinge point under the eccentric rotation of the first cam 641, so as to achieve the purpose of adjusting the differential connecting piece 51 connected with the first rod 613. The second eccentric shaft 6413 drives the joint adjustment drive slider 642 to release the movement in the rotational radial direction by the second slide 6131.
Preferably, the first eccentric shaft 6412 is connected to the output shaft of the joint debugging drive 62 by a connecting sleeve.
The joint adjustment mechanism 60 also includes a resilient connector 644. The elastic connection 644 is disposed between the hinge point of the second cam 643 and the second lever 614; the elastic connection 644 is fixed to the second rod 614 and the other end is fixed to the second cam 643. The elastic connection 644 is used to transmit the output power of the second cam 643 to the second lever 614 and to control the second lever 614 to return. It will be appreciated that in other embodiments, the elastic connection 644 need not be fixed to the second rod 614 or the second cam 643, as long as the two ends of the elastic connection 644 can abut and act on the second rod 614 and the second cam 643, respectively.
When the second cam 643 is driven by the cam portion 6411 of the first cam 641, the second cam 643 drives the second lever 614 to rotate along the hinge point thereof through the elastic connection 644. At this time, the elastic connection member 644 is provided to make the second rod 614 have a certain elastic buffer against the pushing of the pawl 4141, so that the second rod 614 is not easy to be blocked or rigidly collided with the pawl 4141, and further the abrasion between the two is reduced.
The following specifically describes the operation principle of the joint adjustment mechanism 60 in the above embodiment:
The first cam 641 is driven to rotate by rotating the joint adjustment driving piece 62 by a first preset angle, so that the first rod 613 rotates around the center of the hinge shaft, and the position adjustment of the differential connecting piece 51 in the sliding groove 317 is realized, so that the movement difference of the differential feed dog frame 312 and the active feed dog frame 311 is adjusted. After the differential connecting piece 51 enters the bayonet triggering area through the rotation of the joint adjustment driving piece 62 by a second preset angle, the unlocking bayonet 6121 is clamped into the clamping groove 4143 so as to release the engagement between the pawl piece 4141 and the pawl, and then the main shaft 20 is driven by the main shaft 20 driving motor to drive the main shaft 20 and the eccentric wheel 412 to rotate, so that the aim of adjusting the overall forward and backward movement amplitude of the feed dog frame 31 is fulfilled. At this time, the unlocking detent 6121 is snapped into the detent 4143 and the movable link 51 can stay at any position of the slide. If the differential link 51 needs to be adjusted back to the first predetermined angle, the rotation of the joint adjustment driving member 62 can be achieved.
The sewing machine is provided with the joint adjustment mechanism, so that the adjustment of the difference between the two feed dog holders and the whole movement amplitude of the feed dog holders can be adjusted only by arranging one driving piece, the adjustment precision and convenience are improved, the production cost is reduced, and the possibility is provided for the development of the whole miniaturization of the sewing machine.
Referring to fig. 15 and 16, fig. 15 and 16 illustrate an embodiment of a stitch length adjustment mechanism.
In order to meet the requirements of different sewing occasions, the needle pitch in the sewing machine has the requirement of adjustment. The joint adjustment mechanism described above is connected to the transmission assembly 40 and the differential amount adjustment mechanism 50, respectively, and is connected to the transmission assembly 40 alone to constitute a stitch length adjustment mechanism when the forward and backward movement amplitude of the feed dog 31 is changed.
From the foregoing, the movement of the feed dog 31 in the second direction is the movement of dragging the cloth, and the stitch length can be changed by changing the movement amplitude of the feed dog 31 in the second direction. Defining the second direction as the front-rear direction, the adjustment target of the stitch length adjustment mechanism is to change the front-rear movement amplitude of the cloth carrier 31.
Further, as shown in fig. 4 and 5, the feeding link 413 is used to drive the feed dog 31 to move back and forth, and the linkage/de-linkage between the feeding link 413 and the spindle 20 depends on the state of the eccentric cam 414: when an element is inserted into the clamping groove 4143 on the eccentric cam 414, the eccentric cam 414 can temporarily release the locking state between the feeding connecting rod 413 and the spindle 20, at this time, the spindle 20 can rotate along with the spindle driving piece 21 (marked in fig. 1 and 15) but does not drive the feeding connecting rod 413 to move, after the spindle 20 rotates by a preset angle, the eccentric amount between the feeding connecting rod 413 and the spindle 20 changes, so that the forward and backward movement amplitude adjustment of the feeding tooth rack 31 is realized, and finally the needle pitch adjustment is realized; when no component is inserted into the slot 4143, the pawl 4141 on the eccentric cam 414 is engaged with the ratchet 415, and the spindle 20 moves the feed link 413.
As shown in fig. 15 to 17, the stitch length adjusting mechanism includes a joint adjustment drive 62, an adjustment drive assembly, an adjustment shaft 633, a second lever 614, and an unlocking detent 6121. Wherein: the joint adjustment drive 62 is used to output rotational movement to the outside, and may be selected to be a structure capable of outputting selective movement by a stepping motor, a servo motor, or the like. One end of the adjustment driving assembly is connected to the joint adjustment driving member 62, and the other end thereof is connected to the adjustment shaft 633, and the adjustment driving assembly is used for transmitting motion between the joint adjustment driving member 62 and the adjustment shaft 633 so that the adjustment shaft 633 can rotate. One end of the second lever 614 is fixed to the adjusting shaft 633, the other end is used for fixedly setting the unlocking bayonet 6121, and rotation of the adjusting shaft 633 can drive the second lever 614 to swing, so that the unlocking bayonet 6121 at the end thereof can be inserted into/withdrawn from the bayonet slot 4143 on the eccentric cam 414.
Referring to fig. 15 and 16, in the illustrated embodiment, the adjustment drive assembly includes an eccentric 65 connected to the motion output of the joint adjustment drive 62 and a linkage 66, wherein: the eccentric wheel 65 can eccentrically rotate under the drive of the joint adjustment driving piece 62, and the eccentric wheel 65 is in contact fit with the linkage piece 66, so that the eccentric rotation of the eccentric wheel 65 can be converted into the swing of the linkage piece 66; the end of the linkage 66 remote from the eccentric 65 is connected to the adjustment shaft 633 such that the swinging movement of the linkage 66 can be finally converted into a fixed shaft rotation of the adjustment shaft 633.
Referring specifically to fig. 16, the linkage 66 includes a connecting portion 661 fixedly connected to the adjustment shaft 633 and a sliding engagement portion 662 engaged with the eccentric 65, the sliding engagement portion 662 being provided with a sliding engagement groove 6621, and in the assembled state, the eccentric 65 is positioned in the sliding engagement groove 6621, and when the eccentric 65 rotates, its outer contour contacts the groove side wall of the sliding engagement groove 6621, thereby pushing the linkage 66 to swing.
The adjustment driving assembly further includes a pressing member 671 and a fixing member 672, by which the connecting portion 661 of the link member 66 can be fixed to the shaft end of the adjustment shaft 633. The linkage member 66 is fixedly connected to one shaft end of the adjusting shaft 633, so that the space layout of the adjusting driving assembly is more reasonable, and the space occupation of the structure in the sewing machine shell is reduced. In other embodiments, the linkage 66 may be connected to the adjustment shaft 633 in other ways.
Referring to fig. 17, another embodiment of an adjustment drive assembly is shown in fig. 17. In the illustrated embodiment, the adjustment drive assembly includes a drive crank 681, a drive link 682, and a follower link 683. Wherein: the driving crank 681 is fixed on the motion output end of the joint adjustment driving piece 62, one end of the driving crank 681 extends out in a direction away from the motion output end of the joint adjustment driving piece 62, and one end of the driving connecting rod 682 is connected with the end of the driving crank 681; the driven link 683 is connected to the other end of the driving link 682, so that when the driving crank 681 is driven by the joint adjustment driving member 62 to rotate, the driving link 682 connected thereto can be driven to swing, and the driven link 683 is driven to swing by the driving link 682. The end of the follower link 683 distal from the end thereof connected to the drive link 682 is connected to the adjustment shaft 633 such that the swinging movement of the follower link 683 ultimately drives the adjustment shaft 633 in rotation.
Comparing the two embodiments of the adjustment drive assembly shown in fig. 15 and 17: in both embodiments, the adjusting driving assembly is driven by the joint adjusting driving element 62 to finally drive the adjusting shaft 633 to rotate in a fixed shaft manner, so as to drive the second rod 614 fixedly connected to the adjusting shaft 633 to swing in a fixed shaft manner along the rotation axis of the adjusting shaft 633, and thus, the unlocking bayonet 6121 fixed to the second rod 614 can be inserted into/withdrawn from the bayonet 4143 on the eccentric cam 414 along with the swing of the second rod 614. There are many linkages capable of performing the above functions and many simple variations on the adjustment drive assembly shown in fig. 15-17 will be apparent to those skilled in the art.
Referring back to fig. 15, along the extending direction of the feed dog 31 (i.e., the direction perpendicular to the axis of the main shaft 20 in the drawing), there is a certain space between the main shaft 20 and the feed shaft 421, and the feed link 413 connected between the main shaft 20 and the feed shaft 421 is disposed at this space position. In the present invention, since the joint adjustment driving element 62 is in transmission connection with the second rod 614 through the adjustment driving assembly, and the second rod 614 drives the unlocking bayonet 6121 to insert/withdraw in a fixed shaft swinging manner of the second rod 614, the second rod 614 is also disposed in a space between the main shaft 20 and the cloth feeding shaft 421, and meanwhile, the adjustment shaft 633 and a part of the structure of the adjustment driving assembly are also disposed in the space, so that a limited space in the sewing machine is fully utilized, compared with a linear insertion manner of the unlocking bayonet 6121, the swinging insertion manner can make the setting position of related parts more flexible, thereby facilitating the full utilization of the internal space and facilitating the miniaturization development trend of the sewing machine.
Referring to fig. 18 and 19, since the unlocking detent 6121 is inserted into/withdrawn from the detent 4143 with the swing of the second lever 614, the path of withdrawing from the detent 4143 is of an arc type, and if the unlocking detent 6121 touches the groove wall of the detent 4143 at the time of withdrawing from the detent 4143, the eccentric cam 414 may be driven to rotate by a minute angle, affecting the adjustment result of the needle pitch. To avoid this, as shown in fig. 18, by providing the card slot 4143 as a flaring structure near the edge of the eccentric cam 414, a larger space is reserved for the insertion/withdrawal of the unlocking bayonet 6121, thereby solving the problem that the unlocking bayonet 6121 touches the wall of the card slot 4143 at the time of withdrawal.
Similarly, as shown in fig. 19, the end of the unlocking detent 6121, which is far from the end fixedly connected with the second rod 614, may be provided with a detent, and the cross-sectional dimension of the detent is gradually reduced towards the tail end of the unlocking detent 6121, so that the tail end of the unlocking detent 6121 forms a detent with smaller radial dimension, and the problem that the unlocking detent 6121 touches the groove wall of the detent 4143 when withdrawing can be solved. In one embodiment, to form the latching portion with a slightly smaller cross-sectional dimension, the distal end of the unlocking detent 6121 is provided with at least one inclined surface 61211 disposed obliquely with respect to the axial direction of the unlocking detent 6121 itself, as in the embodiment shown in fig. 19, the inclined surfaces 61211 are provided in a pair. It is understood that the forming manner of the locking portion is not limited to that shown in fig. 19, and the end of the unlocking detent 6121 may be directly formed into a frustum-shaped structure, so long as a small end can be formed at the end of the unlocking detent 6121, the problem that the unlocking detent 6121 touches the slot wall of the slot 4143 when withdrawing can be solved.
In addition, the flaring of the locking portion and the slot 4143 can be used simultaneously, so that the unlocking pin 6121 can be better prevented from touching the slot wall of the slot 4143 when withdrawing. At the same time, the flaring and the locking part can facilitate the unlocking bayonet 6121 to be inserted into the slot 4143.
The invention also provides a joint debugging method of the sewing machine, which comprises the following steps:
step S10, controlling the first end of the joint adjustment crank to rotate to a first preset angle so as to adjust the movement difference between the differential feed tooth frame and the active feed tooth frame;
step S20, recording the position of the current joint debugging crank at a first preset angle;
step S30, controlling the joint adjustment crank to rotate to a second preset angle, and enabling the second end of the joint adjustment crank to be unlocked from the locking state between the transmission assembly and the main shaft;
step S40, driving the main shaft to rotate, and changing the eccentric amount between the transmission component and the main shaft to adjust the swing amplitude of the feed dog frame;
and S50, turning the joint adjustment crank to a first preset angle position.
Further, an angle sensor for acquiring the position data of the spindle is arranged on the spindle, and before the step of controlling the joint debugging crank to rotate to the second preset angle, the step of S30 further comprises:
In step S301, the spindle is driven to a predetermined position, so that the transmission assembly connected to the spindle is aligned with the joint adjustment crank.
Because the joint debugging crank needs to be in contact with the locking state between the main shaft and the transmission assembly after aligning the clamping groove, the current position of the main shaft needs to be obtained through an external angle sensor, and the main shaft is adjusted to a preset position, so that the clamping groove is aligned with the joint debugging crank. By the arrangement, the joint adjustment mechanism can be ensured to unlock the locking state between the main shaft and the transmission assembly.
The joint adjustment method can respectively adjust two parameters of motion difference between the differential feed dog frame and the active feed dog frame and eccentric amount between the transmission component and the main shaft, thereby realizing the adjustment aims of accurate adjustment and flexible activation.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (16)

1. The joint debugging mechanism is used for adjusting a feed dog frame in a sewing machine, the sewing machine comprises a main shaft, a feed mechanism and a differential motion adjusting mechanism, the feed mechanism comprises the feed dog frame and a transmission assembly, the transmission assembly is in locking connection with the main shaft and operates under the action of the main shaft, the active feed dog frame and the differential feed dog frame of the feed dog frame are connected with the transmission assembly, and the main shaft drives the feed dog frame to operate through the transmission assembly; the differential quantity adjusting mechanism is connected with the differential feed tooth frame and is used for adjusting the movement difference between the differential feed tooth frame and the active feed tooth frame;
the method is characterized in that the joint debugging mechanism comprises the following steps:
the joint adjustment crank can adjust the rotation angle;
the first end of the joint adjustment crank is connected with the differential quantity adjusting mechanism and adjusts the movement differential quantity between the differential feed tooth frame and the active feed tooth frame under the rotation action;
the second end of the joint debugging crank is selectively connected with the transmission assembly under the rotation action, the joint debugging crank releases the locking state between the transmission assembly and the main shaft, and the eccentric amount between the transmission assembly and the main shaft can be changed by adjusting the angle of the main shaft, and the movement amplitude of the feed dog frame is adjusted.
2. The joint debugging mechanism according to claim 1, wherein an unlocking bayonet lock is fixed at the second end of the joint debugging crank, and the unlocking bayonet lock is used for extending into the transmission assembly and releasing the locking state between the transmission assembly and the main shaft.
3. The joint debugging mechanism of claim 1, further comprising a joint debugging drive that drives rotation of the joint debugging crank and controls the rotation angle of the joint debugging crank.
4. The joint debugging mechanism according to claim 3, further comprising a joint debugging transmission assembly disposed between the joint debugging crank and the joint debugging driving member, the joint debugging driving member driving the joint debugging crank to rotate through the joint debugging transmission assembly.
5. The joint debugging mechanism of claim 4, wherein the joint debugging transmission assembly comprises:
the driving screw rod is connected to the output shaft of the joint adjustment driving piece and rotates along with the output shaft;
the sliding screw is sleeved on the driving screw rod and connected with the joint adjustment crank;
the driving screw rod drives the joint adjustment crank to rotate through the sliding screw nut.
6. The joint debugging mechanism of claim 5, wherein the joint debugging transmission assembly further comprises:
the fixed seat is fixed with the joint adjustment driving piece and is used for installing the driving screw rod;
the rotating fork is embedded in the joint adjustment crank and drives the joint adjustment crank to rotate along the rotating axis of the joint adjustment crank;
the fixed seat is provided with a first slideway; the rotating fork is provided with a mounting groove; one end of the sliding screw is sleeved on the driving screw rod, and the other end of the sliding screw sequentially extends into the first slideway and the mounting groove;
the driving screw rod drives the sliding screw nut to slide along the first slideway under the action of the joint adjustment driving piece and drives the rotating fork to swing around the rotating axis of the joint adjustment crank so as to enable the joint adjustment crank to rotate.
7. The joint debugging mechanism according to claim 4, wherein the joint debugging crank comprises a first rod and a second rod which are arranged separately, wherein the first rod comprises the first end, and the first rod is hinged to a shell of the sewing machine; the second rod comprises a second end and is hinged to the shell of the sewing machine; the joint adjustment transmission assembly is arranged between the first rod and the second rod; the joint adjustment transmission assembly can drive the first rod and the second rod to rotate around the hinge point respectively.
8. The joint adjustment mechanism of claim 7, wherein the joint adjustment transmission assembly comprises a first cam and a second cam, one end of the first cam is eccentrically connected to the first rod, and the other end is connected to the output end of the joint adjustment driving member; the second cam and the second rod are coaxially hinged to the shell, and are abutted against the first cam, and the second rod rotates around the hinge point along with the second cam;
the joint adjustment driving piece drives the first cam, can drive the first rod to rotate around the hinge point, and drives the second rod to rotate around the hinge point through cooperation between the first cam and the second cam.
9. The joint debugging mechanism according to claim 8, wherein the first rod is provided with a second slide way, and the joint debugging transmission assembly further comprises a joint debugging driving slide block, and the joint debugging driving slide block is arranged in the second slide way; the first cam comprises a first eccentric shaft, a second eccentric shaft and a cam part, the first eccentric shaft and the second eccentric shaft are respectively fixed on two end surfaces of the cam part,
the first eccentric shaft is connected to the output end of the joint adjustment driving piece, the second eccentric shaft is fixed to the joint adjustment driving sliding block, and the cam part is propped against the second cam;
The first eccentric shaft drives the sliding block to drive the first rod to swing around the hinge point through the joint adjustment.
10. The joint adjustment mechanism of claim 8, wherein the joint adjustment transmission assembly further comprises an elastic connection mounted between the second cam and the second lever, the second cam driving the second lever to rotate about a hinge point via the elastic connection, the elastic connection providing a force for resetting the second lever.
11. A sewing machine comprising a main shaft, a cloth feed mechanism, and a differential amount adjusting mechanism, characterized in that the sewing machine further comprises the joint adjusting mechanism according to any one of claims 1 to 10.
12. The sewing machine of claim 11, wherein the differential-amount adjusting mechanism comprises:
the differential connecting piece, the first end of differential connecting piece with the joint debugging crank is connected, the second end of differential connecting piece rotates to be connected on the differential feed dog frame, the differential connecting piece is followed the joint debugging crank is around joint debugging crank's axis of rotation swings to adjust the second end of differential connecting piece in the position on the differential feed dog frame, and adjust the swing range of differential feed dog frame.
13. The sewing machine of claim 12, wherein the differential feed dog frame is further provided with a chute along a first direction, the chute including a differential adjustment section and a bayonet unlocking section, the joint adjustment crank being capable of driving the differential linkage to move to a position corresponding to one of the differential adjustment section and the bayonet unlocking section;
when the differential connecting piece corresponds to the differential adjusting section, a preset interval is reserved between the joint adjusting crank and the transmission assembly, so that the transmission assembly is in an operable state;
when the differential connecting piece corresponds to the bayonet lock unlocking section, the joint adjustment crank is contacted with the transmission assembly, and the locking state between the transmission assembly and the main shaft can be released.
14. The sewing machine of claim 11, wherein the transmission assembly comprises a first transmission assembly and a feed shaft, the first transmission assembly is in locking connection with the main shaft, one end of the feed shaft is connected with the first transmission assembly, and the other end is connected with the feed dog frame;
the second end of the joint adjustment crank is selectively connected with the first transmission assembly under the rotation action, the locking state between the first transmission assembly and the main shaft is relieved, and the eccentric amount between the first transmission assembly and the main shaft can be changed by adjusting the angle of the main shaft so as to adjust the movement amplitude of the feed dog frame.
15. A sewing machine joint debugging method, suitable for use in a sewing machine according to any one of claims 11-14, comprising:
controlling the first end of the joint adjustment crank to rotate to a first preset angle so as to adjust the movement difference between the differential feed dog frame and the active feed dog frame;
recording the position of the current joint debugging crank at the first preset angle;
controlling the joint adjustment crank to rotate to a second preset angle, and enabling the second end of the joint adjustment crank to be unlocked from the locking state between the transmission assembly and the main shaft;
driving the main shaft to rotate, and changing the eccentric amount between the transmission component and the main shaft to adjust the movement amplitude of the feed dog frame;
and turning the joint adjustment crank to the position of the first preset angle.
16. The joint debugging method of claim 15, wherein the main shaft is provided with an angle sensor for acquiring main shaft position data, and the step of controlling the joint debugging crank to rotate to a second preset angle further comprises:
and driving the main shaft to a preset position so that a transmission assembly connected with the main shaft is aligned with the joint adjustment crank.
CN202110936969.XA 2020-12-15 2021-08-16 Joint debugging mechanism, sewing machine and sewing machine joint debugging method Active CN114635233B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2020114782669 2020-12-15
CN202011478266 2020-12-15

Publications (2)

Publication Number Publication Date
CN114635233A CN114635233A (en) 2022-06-17
CN114635233B true CN114635233B (en) 2023-07-07

Family

ID=80519127

Family Applications (2)

Application Number Title Priority Date Filing Date
CN202110936969.XA Active CN114635233B (en) 2020-12-15 2021-08-16 Joint debugging mechanism, sewing machine and sewing machine joint debugging method
CN202121917578.5U Active CN215976321U (en) 2020-12-15 2021-08-16 Needle pitch adjusting mechanism and sewing machine with same

Family Applications After (1)

Application Number Title Priority Date Filing Date
CN202121917578.5U Active CN215976321U (en) 2020-12-15 2021-08-16 Needle pitch adjusting mechanism and sewing machine with same

Country Status (1)

Country Link
CN (2) CN114635233B (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007111170A (en) * 2005-10-19 2007-05-10 Shing Ray Sewing Machine Co Ltd Front/rear feed dog differential feeding mechanism in cylinder bed type sewing machine
CN105970492A (en) * 2016-08-03 2016-09-28 杰克缝纫机股份有限公司 Differential cloth feeding adjustment mechanism and sewing machine
CN106988031A (en) * 2017-06-02 2017-07-28 杰克缝纫机股份有限公司 A kind of sewing machine
CN109371577A (en) * 2018-11-19 2019-02-22 杰克缝纫机股份有限公司 Feed dog frame regulating mechanism and the overedger for using the mechanism
CN109371576A (en) * 2018-11-19 2019-02-22 杰克缝纫机股份有限公司 Feed dog frame regulating mechanism and the overedger for using the mechanism
CN109487446A (en) * 2018-12-17 2019-03-19 浙江翔科缝纫机股份有限公司 A kind of sewing machine
CN209722457U (en) * 2018-12-22 2019-12-03 杰克缝纫机股份有限公司 Feed dog frame regulating mechanism and overedger

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007111170A (en) * 2005-10-19 2007-05-10 Shing Ray Sewing Machine Co Ltd Front/rear feed dog differential feeding mechanism in cylinder bed type sewing machine
CN105970492A (en) * 2016-08-03 2016-09-28 杰克缝纫机股份有限公司 Differential cloth feeding adjustment mechanism and sewing machine
CN106988031A (en) * 2017-06-02 2017-07-28 杰克缝纫机股份有限公司 A kind of sewing machine
CN109371577A (en) * 2018-11-19 2019-02-22 杰克缝纫机股份有限公司 Feed dog frame regulating mechanism and the overedger for using the mechanism
CN109371576A (en) * 2018-11-19 2019-02-22 杰克缝纫机股份有限公司 Feed dog frame regulating mechanism and the overedger for using the mechanism
CN109487446A (en) * 2018-12-17 2019-03-19 浙江翔科缝纫机股份有限公司 A kind of sewing machine
CN209722457U (en) * 2018-12-22 2019-12-03 杰克缝纫机股份有限公司 Feed dog frame regulating mechanism and overedger

Also Published As

Publication number Publication date
CN215976321U (en) 2022-03-08
CN114635233A (en) 2022-06-17

Similar Documents

Publication Publication Date Title
CN109371576B (en) Cloth feeding tooth frame adjusting mechanism and overedger using same
CN109355814B (en) Cloth feeding tooth rack adjusting method
CN109371577B (en) Feed dog frame adjustment mechanism and overedger using same
KR20130085003A (en) Cloth feed adjusting device of sewing machine
CN114635233B (en) Joint debugging mechanism, sewing machine and sewing machine joint debugging method
CN101100788A (en) Sewing machine
CN210066121U (en) Cloth feeding tooth frame adjusting mechanism and overedger using same
JPH06262A (en) Rocking sewing machine
US8402903B2 (en) Feed dog device for a sewing machine
CN107761258A (en) A kind of work feed governor motion of sewing machine
CN103469499A (en) Fabric conveying mechanism for back tacking of sewing machine
CA1201021A (en) Fabric feeder mechanism for sewing machine
CN111074433B (en) Feeding mechanism of sewing machine and sewing machine with feeding mechanism
CN210636178U (en) Transfer gear transmission configuration structure of sewing machine
JP3940023B2 (en) Rake sewing machine
CN108118448B (en) Buttonhole sewing machine
CN108118450B (en) Buttonhole sewing machine
CN210826669U (en) Needle pitch limiting mechanism
US4662296A (en) Buttonholder for zigzag sewing machine
CN109629125B (en) Presser foot pressure and tooth rack inclination angle synchronous adjustment method based on overedger
CN108118469B (en) Buttonhole sewing machine
CN219137104U (en) Pattern sewing machine
CN216107513U (en) Needle pitch adjusting mechanism
CN210002050U (en) Needle pitch adjusting and backstitch control device on sewing machines
WO2021128842A1 (en) Feeding mechanism of sewing machine and sewing machine comprising feeding mechanism

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant