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CN-224212920-U - Needle distance adjusting mechanism, presser foot lifting mechanism and sewing machine

CN224212920UCN 224212920 UCN224212920 UCN 224212920UCN-224212920-U

Abstract

The utility model provides a stitch length adjusting mechanism, a presser foot lifting mechanism and a sewing machine, wherein the stitch length adjusting mechanism comprises a shell, a tooth frame and a transmission shaft assembly, the tooth frame is hinged on the transmission rod assembly, the sewing machine further comprises a first power source, a stitch length cam, a driven piece, a transmission piece and a first reset piece, the output end of the first power source is provided with a power rod, the stitch length cam is arranged on the power rod, the driven piece is arranged between the transmission piece and the stitch length cam, when the first power source drives the stitch length cam to rotate, the stitch length cam drives the driven piece to swing and enables the transmission piece to drive the transmission shaft assembly to adjust the position of the tooth frame, and the first reset piece is provided with the side end of the driven piece and controls the stitch length cam to rotate so as to drive the driven piece to swing, so that the transmission piece drives the transmission shaft assembly to rotate, and the purposes of saving labor and high adjustment precision are achieved.

Inventors

  • Ruan Shanbing
  • LIU MENGTING
  • HUANG DAOMAN

Assignees

  • 浙江新顺发缝纫机科技股份有限公司

Dates

Publication Date
20260508
Application Date
20250430

Claims (10)

  1. 1. The needle pitch adjusting mechanism comprises a machine shell (60), a tooth rack (10) and a transmission shaft assembly (11), wherein the tooth rack (10) is hinged to the transmission rod assembly, and is characterized by further comprising a first power source (12), a needle pitch cam (13), a driven piece (14), a transmission piece (141) and a first reset piece (15), wherein the output end of the first power source (12) is provided with a power rod (121), the needle pitch cam (13) is arranged on the power rod (121), the driven piece (14) is arranged between the transmission piece (141) and the needle pitch cam (13), when the first power source (12) drives the needle pitch cam (13) to rotate, the needle pitch cam (13) drives the driven piece (14) to swing and enables the transmission piece (141) to drive the transmission shaft assembly (11) to adjust the position of the tooth rack (10), and the first reset piece (15) is provided with a side end of the driven piece (14).
  2. 2. A stitch length adjustment mechanism as set forth in claim 1, wherein said follower (14) comprises a stitch length link (16) having one end hinged to the housing (60) and defining a hinge point (161) and the other end fixedly connected to the transmission member (141) and defining a fixed point (162), said stitch length link (16) further having an abutment (142) engaging the stitch length cam (13), said abutment (142) being disposed between the hinge point (161) and the fixed point (162).
  3. 3. The stitch length adjustment mechanism as recited in claim 2, wherein said abutment member (142) comprises a bearing one (20), and wherein a side end of said stitch cam (13) abuts a side end of said bearing one (20).
  4. 4. The stitch length adjusting mechanism as set forth in claim 2, wherein the transmission member (141) comprises a stitch length adjusting connecting rod (17), a first joint (18) and a cloth feeding swing rod (19), the stitch length adjusting connecting rod (17) is fixed with the stitch length connecting rod (16), the first joint (18) is hinged on the casing (60), one end of the first joint is hinged with the stitch length adjusting connecting rod (17), the other end of the first joint is fixed with the cloth feeding swing rod (19), and the other end of the cloth feeding swing rod (19) is fixed with the transmission shaft assembly (11).
  5. 5. The needle pitch adjusting mechanism according to claim 4, wherein the transmission shaft assembly (11) comprises a guide rod (23), a dental frame crank (24) and a cloth feeding crank (25), the dental frame crank (24) and the cloth feeding crank (25) are fixedly sleeved on the guide rod (23), the cloth feeding swing rod (19) is hinged with the cloth feeding crank (25), and the dental frame crank (24) is hinged with the dental frame (10).
  6. 6. The presser foot lifting mechanism comprises a presser foot assembly (30), and comprises a casing (60) and a first power source (12) as claimed in claim 1, wherein the output end of the first power source (12) is provided with a power rod (121), and the presser foot lifting mechanism is characterized by further comprising a presser foot lifting cam (32), a second transmission adjusting assembly (33) and a second reset piece (34), wherein the presser foot lifting cam (32) is arranged on the power rod (121), the second transmission adjusting assembly (33) is arranged between the presser foot assembly (30) and the presser foot lifting cam (32), and when the power rod (121) drives the presser foot lifting cam (32) to rotate, the second transmission adjusting assembly (33) drives the presser foot assembly (30) to move upwards, and the second reset piece (34) is arranged at the upper end of the presser foot assembly (30) and is used for resetting the presser foot assembly (30).
  7. 7. The presser foot lifting mechanism according to claim 6, wherein the second transmission adjusting component (33) comprises a guide plate connecting rod (35), a presser foot lifting guide plate (36), a presser foot rear lever (37), a lever pull rod (38), a knee-control lifting lever (39) and a presser foot lifting frame (40), one end of the guide plate connecting rod (35) is hinged on the machine shell (60), the other end of the guide plate connecting rod is hinged with one end of the presser foot lifting guide plate (36), a long waist hole I (42) is formed in the other end of the presser foot lifting guide plate (36), one end of the presser foot rear lever (37) slides in the long waist hole I (42), the middle part of the presser foot rear lever (37) is hinged on the machine shell (60), the other end of the presser foot rear lever is fixedly connected with one end of the lever pull rod (38), the other end of the lever pull rod (38) is fixedly connected with the knee-control lifting lever knee (39), the other end of the lever pull rod (39) is hinged on the machine shell (60) and fixedly connected with the presser foot lifting frame (40), one end of the lever is hinged with the knee-control lifting lever (39), one end of the presser foot lifting lever is fixedly connected with the presser foot lifting frame (40), one end is in a sliding component.
  8. 8. The presser foot lifting mechanism as set forth in claim 6, wherein the presser foot assembly (30) comprises a pressing rod (45), a pressure regulating guide rod (46) and a presser foot (47), the presser foot (47) is arranged at the bottom of the pressing rod (45), a guide hole is further formed in the pressing rod (45), the pressure regulating guide rod (46) is slidably arranged in the guide hole, and the resetting piece II (34) comprises a pressure regulating spring (48) which is sleeved on the pressure regulating guide rod (46).
  9. 9. The sewing machine comprises a machine shell (60) and is characterized by further comprising a stitch length adjusting mechanism according to any one of claims 1-5 and a presser foot lifting (47) mechanism according to any one of claims 6-8, wherein the power source I (12) comprises a servo motor (61), the stitch length cam (13) and the presser foot lifting cam (32) are fixedly arranged on a power rod (121), and the stitch length cam (13) and a flange of the presser foot lifting cam (32) are reversely arranged.
  10. 10. The sewing machine of claim 9, wherein the presser foot lifting cam (32) drives the guide plate connecting rod (35) to swing when the power source I (12) drives the power rod (121) to rotate clockwise, and the stitch cam (13) drives the stitch connecting rod (16) to swing when the power source I (12) drives the power rod (121) to rotate anticlockwise.

Description

Needle distance adjusting mechanism, presser foot lifting mechanism and sewing machine Technical Field The utility model relates to a sewing machine, in particular to a stitch length adjusting mechanism, a presser foot lifting mechanism and a sewing machine. Background The old-fashioned sewing machine is usually through spanner axle pair to lift presser foot adjustment mechanism through old-fashioned knee rest device control, current sewing machine is when adjusting the stitch, adjusts through manual control stitch adjustment mechanism, adjusts the presser foot through lifting the presser foot mechanism simultaneously, and operating personnel is comparatively laborious when adjusting, and the regulation precision is relatively poor. Disclosure of utility model In view of the above, a first object of the present utility model is to provide a stitch length adjusting mechanism, which has the advantages of accurate and labor-saving stitch length adjustment. The technical scheme is that the needle pitch adjusting mechanism comprises a shell, a tooth frame and a transmission shaft assembly, wherein the tooth frame is hinged to the transmission rod assembly, the needle pitch adjusting mechanism further comprises a first power source, a needle pitch cam, a driven piece, a transmission piece and a first reset piece, the output end of the first power source is provided with a power rod, the needle pitch cam is arranged on the power rod, the driven piece is arranged between the transmission piece and the needle pitch cam, when the first power source drives the needle pitch cam to rotate, the needle pitch cam drives the driven piece to swing, the transmission piece drives the transmission shaft assembly to adjust the position of the tooth frame, and the first reset piece is provided with a side end of the driven piece. Through the technical means, the needle pitch cam is controlled to rotate by the power source I, so that the driven piece is driven to swing, the transmission piece drives the transmission shaft assembly to rotate, the position of the dental articulator is adjusted, and the purposes of saving labor and high adjustment precision are achieved. Preferably, the follower comprises a pitch link, one end of the pitch link is hinged on the casing and forms a hinge point, the other end of the pitch link is fixedly connected with the transmission piece and forms a fixed point, an abutting piece matched with the pitch cam is further arranged on the pitch link, and the abutting piece is arranged between the hinge point and the fixed point. Through the technical means, the needle distance connecting rod is hinged with the machine shell, and the transmission piece is fixed at the other end of the needle distance connecting rod, so that the needle distance connecting rod is driven to rotate around a hinge point when the needle distance cam rotates, and the swing of the transmission piece is realized. Preferably, the abutting piece comprises a bearing I, and the side end of the needle distance cam abuts against the side end of the bearing I. Through the technical means, the friction force between the needle pitch cam and the needle pitch connection is reduced through the bearing, and the noise emitted by equipment is reduced. Preferably, the transmission piece comprises a needle pitch adjusting connecting rod, a first connector and a cloth feeding swing rod, wherein the needle pitch adjusting connecting rod is fixed with the needle pitch connecting rod, the first connector is hinged to the machine shell, one end of the first connector is hinged to the needle pitch adjusting connecting rod, the other end of the first connector is fixed with the cloth feeding swing rod, and the other end of the cloth feeding swing rod is fixed with the transmission shaft assembly. Through the technical means, the needle distance adjusting connecting rod is driven to move by hinging the needle distance connecting rod around the hinging point, and the first connector and the cloth feeding swing rod are driven to swing, so that the transmission shaft assembly is driven to adjust the position of the pressing frame. Preferably, the transmission shaft assembly comprises a guide rod, a tooth frame crank and a feed crank, wherein the tooth frame crank and the feed crank are fixedly sleeved on the guide rod, the feed swing rod is hinged with the feed crank, and the tooth frame crank is hinged with the tooth frame. Through the technical means, the needle distance is adjusted through the hinging between the dental frame crank and the dental frame. The second object of the utility model is to provide a presser foot lifting mechanism which has the advantage of accurately and laborsaving adjusting the speed of lifting the presser foot. The technical scheme is that the presser foot lifting mechanism comprises a presser foot assembly, wherein a power rod is arranged at the output end of a first power source, the presser foot lifting mechanism further com