CN210341308U - Sewing machine needle pitch control structure - Google Patents
Sewing machine needle pitch control structure Download PDFInfo
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- CN210341308U CN210341308U CN201920359691.2U CN201920359691U CN210341308U CN 210341308 U CN210341308 U CN 210341308U CN 201920359691 U CN201920359691 U CN 201920359691U CN 210341308 U CN210341308 U CN 210341308U
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- plate body
- sewing machine
- feeding
- free end
- needle pitch
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Abstract
The utility model provides a sewing machine gauge needle control structure, is including being used for driving the lever lower extreme pivoted driver source that sewing machine backstitch mechanism was upwards through the drive disk assembly, the driver source is fixed in through the installing support on sewing machine's the casing. The utility model discloses can change the positive stitch gauge length, and the change of positive stitch gauge length is controllable, simultaneously, and is comparatively convenient, can adapt to the demand of specific technology.
Description
Technical Field
The utility model relates to a sewing machine technical field especially relates to a sewing machine gauge needle control structure.
Background
The stitch length of the existing industrial flat sewing machine during sewing is set by a mechanical structure to change the position angle of a swinging plate of a feeding eccentric wheel component, thereby changing the stitch length. The lockstitch sewing machine runs with a first positive stitch pitch during sewing, but also needs to run with a second positive stitch pitch under certain process requirements. At present, the stitch length can be changed only by a backstitch mode: the backstitch spanner is manually pulled to change the needle pitch, or the backstitch electromagnet is used for driving the reverse feeding according to the same needle pitch, but the needle pitch is uncontrollable and inconvenient.
The patent application specification with the application number of 201810244778.5 discloses a close sewing device, which realizes close sewing by driving a limiting plate to change the stroke of a backstitch electromagnet through a driver. The defect is that the stitch length of the close seam can not be adjusted.
SUMMERY OF THE UTILITY MODEL
Therefore, the technical problem is solved by providing a stitch length control structure of a sewing machine.
In order to solve the technical problem, the utility model adopts the following technical scheme:
the utility model provides a sewing machine gauge needle control structure, is including being used for driving the lever lower extreme pivoted driver source that sewing machine backstitch mechanism was upwards through the drive disk assembly, the driver source is fixed in through the installing support on sewing machine's the casing.
The mounting bracket is a first plate body which is horizontally arranged, an orifice in the vertical direction is formed in the first plate body, the driving source is a needle pitch adjusting electromagnet which is fixed on the lower surface of the first plate body, and an iron core of the needle pitch adjusting electromagnet penetrates through the orifice to the front surface of the first plate body.
The iron core backstitch mechanism comprises a first plate body, a second plate body, a transmission part, a third plate body and a backstitch mechanism, wherein the first plate body is fixed on the first plate body, one end of the second plate body is a turnover end perpendicular to the first plate body, the transmission part is the third plate body, the third plate body is hinged with the turnover end through a horizontal hinged shaft, the third plate body is provided with a first free end and a second free end, the first free end is located above the iron core, and the second free end is located below a lever of the backstitch mechanism and a connecting rod pin of a connecting rod in a hinged mode.
This scheme still includes the reset torsion spring, the upper surface of first free end has the caulking groove, the one end of reset torsion spring with the second plate body is fixed, the other end inlay in the caulking groove.
The utility model discloses can change the positive stitch gauge length, and the change of positive stitch gauge length is controllable, simultaneously, and is comparatively convenient, can adapt to the demand of specific technology.
Drawings
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments:
fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the present invention mounted on a sewing machine;
FIG. 3 is a schematic view illustrating the rotation variation of the swing plate base of the present invention;
FIG. 4 is a schematic structural view of a backstitch mechanism of the sewing machine;
FIG. 5 is a first schematic structural view of a feeding mechanism of the sewing machine;
FIG. 6 is a second schematic structural view of a feeding mechanism of the sewing machine;
FIG. 7 is a third schematic structural view of a feeding mechanism of the sewing machine;
FIG. 8 is a schematic view showing the structural relationship between the swing plate seat and the feeding crank of the sewing machine.
Detailed Description
As shown in fig. 1, a needle pitch control structure of a sewing machine includes a mounting bracket 1100, a driving source 1200, a transmission piece 1300, and a restoring torsion spring 1400.
The mounting bracket 1100 is a horizontally disposed first plate 1110 having an up-and-down aperture 1111 formed therein.
A second plate 1120 is fixed on the first plate 1110, and one end of the second plate 1120 is a turning end 1121 perpendicular to the first plate 1110.
The driving source 1200 is controlled by a control system for driving the lower end 223a of the lever 223 of the backstitch mechanism of the sewing machine to rotate upward through the driving transmission member 1300, and the driving source 1200 is fixed to the housing 21 of the sewing machine 2 through the mounting bracket 1100, see fig. 2.
The driving source 1200 is a pin pitch electromagnet fixed to the lower surface of the first plate 1110, and the iron core 1210 penetrates through the hole 1111 to the front surface of the first plate 1110.
The transmission member 1300 is a third plate body hinged to the folding end 1121 through a horizontal hinge axis 1310, and has a first free end 1320 and a second free end 1330 lower than the first free end 1320, wherein the first free end 1320 is located above the iron core 1210, and the second free end 1330 is located below the lever 223 and the link pin 225 of the hinge backstitch mechanism 220.
The upper surface of the first free end 1320 has a slot 1321, one end of the torsion spring 1400 is fixed to the second plate 1220, and the other end is embedded in the slot 1321.
When the needle pitch needs to be changed, the control system controls the driving source 1200 to drive the transmission piece 1300 to drive the lower end 223a of the lever 223 of the backstitch mechanism of the sewing machine to rotate upwards (anticlockwise in fig. 4), and the connecting rod 224 drives the swing plate seat 234 to rotate upwards (anticlockwise in fig. 3), so that the swing plate seat 234 swings from the α angular position to the β angular position, and the first positive needle pitch at the α angular position is changed into the second positive needle pitch at the β angular position.
The utility model discloses a driving source 1200 is under control system's control, adjustable transmission piece 1300's stroke, so to sewing needle pitch's change controllable, and comparatively convenient, can adapt to the demand of specific technology.
In this embodiment, the control system controls the needle pitch adjusting electromagnet to close, and the iron core 1210 moves to push the transmission member 1300 to swing around the hinge axis 1310 thereof, so as to drive the lower end 223a of the lever 223 to rotate upward.
When the needle pitch adjusting electromagnet discharges electricity, the reset torsion spring 1400 resets the transmission piece 1300 and the iron core 1210 by using elasticity.
For a better understanding of the principles of the present invention, it is necessary to describe the backstitch mechanism 220 and the feed mechanism 230 of the sewing machine 2.
As shown in fig. 4, the backstitch mechanism 220 includes a backstitch electromagnet 221, a backstitch link 222, a lever 223, a link 224, and a link pin 225, the backstitch electromagnet 221 is fixed to the housing 21, the lever 223 is rotatably fixed to the housing 21, the backstitch link 222 is hinged to an upper end of the lever 223, and a lower end of the lever 223 is hinged to an upper end of the link 224 through the link pin 225.
As shown in fig. 5 to 8, the feeding mechanism 230 includes a main shaft 231, a feeding shaft 232, a feed lifting shaft 233, a swing plate base 234, an eccentric wheel 235, a feeding link 236a, a feeding short swing plate 236b, a feeding long swing plate 236c, a feeding crank 236d, a rack crank 237a, a rack 237b, a feeding tooth 237c, a slider 237d, a feed lifting link 238a, a feed lifting tooth rear crank 238b, a feed lifting tooth front crank 238c, and a backstitch wrench 239.
Wherein, the eccentric wheel 235 is fixed on the main shaft 231, one end of the feeding connecting rod 236a is hinged on the eccentric wheel 235, the other end of the feeding connecting rod 236a is hinged with one end of the feeding short swinging plate 236b and one end of the feeding long swinging plate 236c, the other end of the feeding long swinging plate 236c is hinged with one end of the feeding crank 236d, the other end of the feeding short swinging plate 236b is hinged on the swinging plate seat 234, the other end of the feeding crank 236d is fixedly connected on the feeding shaft 232, the feeding shaft 232 is simultaneously and fixedly connected with a tooth frame crank 237a, the other end of the tooth frame crank 237a is hinged with one end of a tooth frame 237b, the other end of the tooth frame 237b is hinged with a slide block 237d, the slide block 237d is in sliding connection with a tooth lifting front crank 238c, and the tooth lifting front crank 238 c.
As shown in fig. 4, the swing plate seat 234 is hinged to the lower end of the connecting rod 224.
One end of the lifting tooth connecting rod 238a is hinged on the eccentric wheel 235, the other end of the lifting tooth connecting rod 238a is hinged with one end of the lifting tooth rear crank 238b, and the other end of the lifting tooth rear crank 238b is fixedly connected on the lifting tooth shaft 233.
The backstitch wrench 239 is connected to the swing plate base 234.
When the feeding mechanism 230 operates, the main shaft 231 rotates to drive the eccentric wheel 235 to rotate, the feeding connecting rod 236a and the lifting tooth connecting rod 238a are respectively driven to move up and down, and the lifting tooth connecting rod 238a enables the feeding tooth 237c to move up and down through the lifting tooth rear crank 238b, the lifting tooth shaft 233 and the lifting tooth front crank 238 c.
The swinging plate base 234 is fixed in relative position, the feeding short swinging plate 236b swings along the hinge center of the swinging plate base 234, the feeding connecting rod 236a drives the feeding crank 236d to swing through the feeding long swinging plate 236c, and the feed dog crank 237a which is fixedly connected to the feeding shaft 232 like the feeding crank 236d swings along with the feeding short swinging plate, so that the feeding dog 237c fixedly connected to the feed dog 237b moves back and forth.
The feed dog 237c moves up and down and back and forth simultaneously to form a feeding action.
It can be seen that the feeding crank 236d has different swing angles due to different angles of the swing plate 234, so that the feeding teeth 237c have different moving distances and thus different needle pitches, and thus the needle pitches can be controlled by controlling the angles of the swing plate 234. The stitch length of the flat sewing machine is formed by moving the sewing material for a certain distance by the feeding teeth, then the machine needle pierces the cloth, and the cycle is repeated in sequence, in the process, the machine needle only pierces the cloth, and the cloth moving is realized by the feeding teeth, so the stitch length can be controlled by controlling the feeding teeth to move.
However, those skilled in the art should realize that the above embodiments are only used for illustrating the present invention and not used as a limitation of the present invention, and that the changes and modifications to the above embodiments are within the scope of the appended claims as long as they are within the true spirit of the present invention.
Claims (1)
1. A needle pitch control structure of a sewing machine is characterized by comprising a driving source which is used for driving the lower end of a lever of a backstitch mechanism of the sewing machine to rotate upwards through a driving transmission part, the driving source is fixed on a shell of the sewing machine through a mounting bracket, the mounting bracket is a first plate body which is horizontally arranged, an orifice in the upper direction and the lower direction is arranged on the first plate body, the driving source is a needle pitch adjusting electromagnet, the needle pitch adjusting electromagnet is fixed on the lower surface of the first plate body, an iron core of the needle pitch adjusting electromagnet penetrates through the orifice to the front side of the first plate body, a second plate body is fixed on the first plate body, one end of the second plate body is a turnover end which is vertical to the first plate body, the transmission part is a third plate body, the third plate body is hinged with the turnover end through a horizontal hinge shaft, the third plate body is provided with a first free end and a second free end, and the first free end is positioned, the second free end is located below a lever hinged with the backstitch mechanism and a connecting rod pin of the connecting rod, the second free end further comprises a reset torsion spring, an embedded groove is formed in the upper surface of the first free end, one end of the reset torsion spring is fixed with the second plate body, and the other end of the reset torsion spring is embedded in the embedded groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920359691.2U CN210341308U (en) | 2019-03-21 | 2019-03-21 | Sewing machine needle pitch control structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920359691.2U CN210341308U (en) | 2019-03-21 | 2019-03-21 | Sewing machine needle pitch control structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210341308U true CN210341308U (en) | 2020-04-17 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920359691.2U Active CN210341308U (en) | 2019-03-21 | 2019-03-21 | Sewing machine needle pitch control structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210341308U (en) |
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2019
- 2019-03-21 CN CN201920359691.2U patent/CN210341308U/en active Active
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