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CN-121992582-A - Needle distance electronic adjusting method and system of sewing machine and overedger

CN121992582ACN 121992582 ACN121992582 ACN 121992582ACN-121992582-A

Abstract

The invention discloses a stitch length electronic adjusting method of a sewing machine, a stitch length electronic adjusting system and an overedger, wherein the stitch length electronic adjusting method of the sewing machine comprises the steps that a control mechanism outputs a stitch length adjusting signal; the spindle motor controls the spindle to rotate for a certain angle, the opening eccentric cam rotates along with the spindle to enable the second circumferential section or the fourth circumferential section to rotate to face the opening pin, the needle pitch motor controls the opening pin to act and prop against the second circumferential section or the fourth circumferential section, the spindle motor controls the spindle to rotate for a certain angle, the opening eccentric cam rotates along with the spindle to enable the first circumferential section to rotate to face the opening pin, the opening pin enters an opening groove in the first circumferential section and applies a certain acting force to the pawl to enable the pawl to be separated from the ratchet, and then subsequent needle pitch adjusting action is carried out. The invention can avoid the problem of ineffective needle distance adjusting function caused by abrasion of the open pin, and still can realize the needle distance adjusting function after the open pin is abraded.

Inventors

  • WANG LINFENG
  • Zhu sairui
  • SONG GUOQING

Assignees

  • 杰克科技股份有限公司

Dates

Publication Date
20260508
Application Date
20260326

Claims (10)

  1. 1. An electronic stitch length adjusting method of a sewing machine is characterized by comprising the following steps: s1, outputting a signal for adjusting the stitch length by a control mechanism of the sewing machine; S2, controlling the spindle (6) to rotate by a certain angle by the spindle motor (1), and enabling the open-needle eccentric cam (2) sleeved on the spindle (6) to rotate by a certain angle along with the spindle (6) so that the second circumferential surface section (202) or the fourth circumferential surface section (204) of the open-needle eccentric cam (2) rotates to face the open-needle pin (301); S3, controlling the motion of the open pin (301) by the stitch length motor (5) so that the open pin (301) is propped against the second circumferential surface section (202) or the fourth circumferential surface section (204) of the open eccentric cam (2); S4, the spindle motor (1) controls the spindle (6) to rotate at a certain angle, the open-needle eccentric cam (2) rotates at a certain angle along with the spindle (6), so that a first circumferential section (201) of the open-needle eccentric cam (2) rotates to face an open-needle pin (301), the open-needle pin (301) enters an open-needle groove (20101) on the first circumferential section (201), a certain force is applied to a pawl (7) which is arranged on the surface of the open-needle eccentric cam (2) in a sliding manner in the radial direction, the pawl (7) is separated from a ratchet wheel (8) fixed on the spindle (6), and then a subsequent needle pitch adjusting action is carried out, wherein the first circumferential section (201) is located between a second circumferential section (202) and a fourth circumferential section (204), and the width of the first circumferential section (201) is smaller than the widths of the second circumferential section (202) and the fourth circumferential section (204).
  2. 2. The method for electronically adjusting the stitch length of a sewing machine as recited in claim 1, further comprising the steps of: S5, after the subsequent needle distance adjusting action is completed, the needle distance motor (5) controls the needle opening pin (301) to act reversely, so that the needle opening pin (301) is withdrawn out of the needle opening groove (20101), and the pawl (7) is meshed with the ratchet wheel (8) again under the action of the reset component.
  3. 3. The electronic stitch length adjusting method for a sewing machine according to claim 2, wherein the step S3 is characterized in that the stitch length motor (5) controls the action of the needle opening assembly (3) through the connecting rod assembly, so that the needle opening pin (301) at one end of the needle opening assembly (3) acts and is propped against the second circumferential surface section (202) or the fourth circumferential surface section (204) of the needle opening eccentric cam (2).
  4. 4. The electronic stitch length adjusting method for a sewing machine according to claim 3, wherein in the step S3, the connecting rod assembly comprises a first connecting rod (401) and a second connecting rod (402), one end of the first connecting rod (401) is fixedly connected with an output shaft of the stitch length motor (5), the other end of the first connecting rod (401) is hinged with one end of the second connecting rod (402), the other end of the second connecting rod (402) is fixedly connected with the stitch opening assembly (3), and the stitch opening pin (301) is fixed at one end of the stitch opening assembly (3).
  5. 5. The electronic stitch length adjusting method of a sewing machine according to claim 2, wherein in step S5, the reset component is a torsion spring, one end of the torsion spring is fixed on the surface of the open needle eccentric cam (2) and the other end is fixedly connected with the pawl (7).
  6. 6. The method for electronically adjusting the stitch length of a sewing machine as recited in claim 2, wherein, The step S2 is specifically that the spindle motor (1) controls the spindle (6) to rotate for a certain angle, and the open needle eccentric cam (2) sleeved on the spindle (6) rotates for a certain angle along with the spindle (6) so that the second circumferential surface section (202) of the open needle eccentric cam (2) rotates to face the open needle pin (301); Step S3 is specifically that the needle distance motor (5) controls the action of the needle opening pin (301) to enable the needle opening pin (301) to prop against the second circumferential surface section (202) of the needle opening eccentric cam (2); The step S4 is specifically that the spindle motor (1) controls the spindle (6) to rotate clockwise for a certain angle, the open needle eccentric cam (2) rotates clockwise for a certain angle along with the spindle (6), so that the first circumferential section (201) of the open needle eccentric cam (2) rotates to face the open needle pin (301), the open needle pin (301) enters the open needle groove (20101) on the first circumferential section (201), and a certain force is applied to the pawl (7) which is arranged on the surface of the open needle eccentric cam (2) in a sliding way in the radial direction, so that the pawl (7) is separated from the ratchet wheel (8) fixed on the spindle (6), and then the subsequent needle pitch adjusting action is carried out.
  7. 7. The method for electronically adjusting the stitch length of a sewing machine as recited in claim 2, wherein, The step S2 is specifically that the spindle motor (1) controls the spindle (6) to rotate for a certain angle, and the open needle eccentric cam (2) sleeved on the spindle (6) rotates for a certain angle along with the spindle (6) so that the fourth circumferential surface section (204) of the open needle eccentric cam (2) rotates to face the open needle pin (301); step S3 is specifically that the needle distance motor (5) controls the action of the needle opening pin (301) to enable the needle opening pin (301) to prop against the fourth circumferential surface section (204) of the needle opening eccentric cam (2); The step S4 specifically comprises the steps that the spindle motor (1) controls the spindle (6) to rotate anticlockwise by a certain angle, the open needle eccentric cam (2) rotates anticlockwise along with the spindle (6) by a certain angle, the first circumferential surface section (201) of the open needle eccentric cam (2) rotates to face the open needle pin (301), the open needle pin (301) enters the open needle groove (20101) on the first circumferential surface section (201), a certain acting force is applied to the pawl (7) which is arranged on the surface of the open needle eccentric cam (2) in a sliding manner in the radial direction, so that the pawl (7) is separated from the ratchet wheel (8) fixed on the spindle (6), and then subsequent needle pitch adjustment actions are carried out.
  8. 8. A needle pitch electronic adjusting system of a sewing machine for executing the needle pitch electronic adjusting method of the sewing machine according to any one of claims 1 to 7, characterized by comprising a spindle motor (1), a spindle (6), a needle opening eccentric cam (2), a needle opening pin (301), a needle pitch motor (5), a pawl (7) and a ratchet wheel (8), wherein the spindle (6) is driven to rotate by the spindle motor (1), the needle opening eccentric cam (2) is sleeved on the spindle (6), the circumference of the needle opening eccentric cam (2) is divided into four sections, and is respectively called a first circumference section (201), a second circumference section (202), a third circumference section (203) and a fourth circumference section (204) according to the clockwise direction, the pawl (7) is radially and slidingly arranged on the surface of the needle opening eccentric cam (2) and is meshed with the ratchet wheel (8) sleeved on the spindle (6), the needle opening pin (301) is driven to act by the needle pitch motor (5) so that the needle opening pin (301) is propped against the first circumference section (201), the needle opening eccentric cam (2) enters into the ratchet wheel (201) to be separated from the first circumference section (201) and the ratchet wheel (201) to be separated from the ratchet wheel (20101), or the open pin (301) is withdrawn from the open slot (20101) and the pawl (7) is re-engaged with the ratchet wheel (8).
  9. 9. The electronic needle distance adjusting system of the sewing machine according to claim 8, further comprising a reset assembly, a connecting rod assembly and a needle opening assembly (3), wherein one end of the reset assembly is fixed on the surface of the needle opening eccentric cam (2) and the other end of the reset assembly is fixedly connected with the pawl (7), the connecting rod assembly comprises a first connecting rod (401) and a second connecting rod (402), one end of the first connecting rod (401) is fixedly connected with an output shaft of the needle distance motor (5), the other end of the first connecting rod (401) is hinged with one end of the second connecting rod (402), the other end of the second connecting rod (402) is fixedly connected with the needle opening assembly (3), and the needle opening pin (301) is fixed at one end of the needle opening assembly (3).
  10. 10. An overedger comprising the electronic stitch control system of the sewing machine of claim 8.

Description

Needle distance electronic adjusting method and system of sewing machine and overedger Technical Field The invention belongs to the technical field of sewing machines, and particularly relates to a stitch length electronic adjusting method and a stitch length electronic adjusting system of a sewing machine and an overedger. Background With the popularization of electronics, the electronic stitch adjusting technology of the overedger is more and more, and compared with the original stitch adjusting mode, most electronic stitch adjusting modes are that a stitch motor drives a stitch opening pin to act, so that the stitch opening pin is propped in a stitch opening groove on the circumferential surface of a stitch opening eccentric cam, a pawl which is arranged on the surface of the stitch opening eccentric cam in a sliding way along the radial direction is separated from a ratchet wheel fixed on a main shaft, so that the stitch adjusting action is realized, but the abrasion problem of the stitch opening pin is aggravated because the driving force of the stitch motor is far greater than the manpower, and the stitch adjusting function is invalid after the stitch opening pin is worn, and particularly: as shown in fig. 1 to 3, the circumferential surface of the open-needle eccentric cam 2 is divided into four segments, and is respectively referred to as a first circumferential segment 201, a second circumferential segment 202, a third circumferential segment, Third circumferential surface segment 203 and fourth circumferential surface segment 204, wherein first circumferential surface segment 201 and third circumferential surface segment 203 have the same width and are arranged oppositely, second circumferential surface segment 202 and fourth circumferential surface segment 204 have the same width and are arranged oppositely, and first circumferential surface segment 201 has a smaller width than second circumferential surface segment 202, as shown in fig. 5, when stitch length motor 5 controls stitch length motor 301 to act, stitch length motor 301 abuts against a corresponding segment of the circumferential surface of stitch length eccentric cam 2, spindle motor 1 drives spindle 6 to rotate, and pawl 7 radially sliding on the surface of stitch length eccentric cam 2 engages ratchet wheel 8 sleeved on spindle 6, so that stitch length eccentric cam 2 sleeved on spindle 6 rotates along with spindle 6, and stitch length cam 2 is driven to rotate by spindle 6, and stitch length cam 301 may need to pass through first circumferential surface segment 201 of stitch length eccentric cam 2, A second circumferential segment 202, Third and fourth circumferential sections 203 and 204 until the ejector pin 301 enters the open groove 20101 on the first circumferential section 201 and applies a certain force to the pawl 7 to separate the pawl 7 from the ratchet wheel 8, thereby facilitating the stitch length adjustment, wherein the surface of the ejector pin 301 abutting against the circumferential surface of the ejector eccentric cam 2 is called the ejector pin abutment surface, the rear portion of the ejector pin abutment surface contacts and rubs with the first circumferential section 201 during the passage of the ejector pin 301 through the first circumferential section 201, the front portion of the ejector pin abutment surface is suspended on one side of the first circumferential section 201 without friction, and likewise, the rear portion of the ejector pin abutment surface contacts and rubs with the third circumferential section 203 during the passage of the ejector pin 301 through the third circumferential section 203, while the front part of the abutting surface of the opening pin is suspended on one side of the third circumferential surface segment 203 without friction, the whole surface of the abutting surface of the opening pin, namely the front part and the rear part, can be contacted with the second circumferential surface segment 202 and friction occurs in the process of passing through the second circumferential surface segment 202, and likewise, the whole surface of the abutting surface of the opening pin, namely the front part and the rear part, can be contacted with the fourth circumferential surface segment 204 and friction occurs in the process of passing through the fourth circumferential surface segment 204, so that the abrasion degree of the rear part of the abutting surface of the opening pin is more serious than that of the front part after long-term use, and when the main shaft 6 drives the opening eccentric cam 2 to rotate, the opening pin 301 transits from the first circumferential surface segment 201 or the third circumferential surface segment 203 with smaller width to the second circumferential surface segment 202 or the fourth circumferential surface segment 204 with larger width, the problem that the front part of the abutting surface of the open pin is blocked at the junction between two ad