CN213978117U

CN213978117U - Needle bar rotating mechanism of sewing machine

Info

Publication number: CN213978117U
Application number: CN202021880593.2U
Authority: CN
Inventors: 毕兴国
Original assignee: Zhejiang Maqi Sewing Machine Co Ltd
Current assignee: Zhejiang Maqi Sewing Machine Co Ltd
Priority date: 2020-09-01
Filing date: 2020-09-01
Publication date: 2021-08-17
Anticipated expiration: 2030-09-01

Abstract

The utility model belongs to the technical field of make up equipment, a sewing machine's needle bar rotary mechanism is related to, it has solved the longer relatively poor scheduling problem of back stability of current sewing machine's needle bar rotary mechanism operating duration. The sewing machine comprises a machine shell and a needle rod, wherein the needle rod is movably arranged on the machine shell, the needle rod rotating mechanism comprises a rotating driving source fixed on the machine shell, the output end of the rotating driving source is provided with a driving part, a driven part synchronously rotating with the driving part is rotatably arranged on the machine shell, the driven part is provided with a through hole along the vertical direction, the needle rod penetrates through the through hole, and the side wall of the needle rod is provided with a vertical groove; the side wall of the driven part is provided with a limiting hole communicated with the through hole, a limiting part is arranged in the limiting hole, the inner end of the limiting part is provided with a limiting part, the limiting part is positioned in the groove, and two sides of the limiting part are in sliding contact with two side walls of the groove. Even some looseness take place for the locating part in this application, because spacing portion still is located the needle bar recess, consequently can not produce the clearance, still can stabilize the sewing.

Description

Needle bar rotating mechanism of sewing machine

Technical Field

The utility model belongs to the technical field of make up equipment, a needle bar rotary mechanism of sewing machine is related to.

Background

When the traditional sewing machine sews, the needle bar can not rotate correspondingly according to the sewing pattern, thereby affecting the stitch aesthetic property and even causing the phenomenon of thread breakage.

In order to solve the above problems, chinese patent CN109554846A discloses a needle bar and thread take-up mechanism of a sewing machine capable of infinitely rotating, which comprises a main shaft motor and a second motor, wherein the main shaft motor rotates to drive a first main shaft to rotate, so that a needle bar crank drives the needle bar to move up and down; and the second motor rotates, and the needle rod can be driven to rotate by the worm gear mechanism. In order to ensure that the up-and-down movement and the rotation of the needle rod are not interfered with each other, a clamping surface is arranged on the excircle of the needle rod, a lower needle rod sleeve is sleeved on the needle rod and connected with a worm wheel into a whole, pin holes are radially formed in the lower needle rod sleeve, and cylindrical clamping blocks attached to the clamping surface on the needle rod are arranged in the pin holes, so that the circumferential positioning and the axial sliding between the needle rod and the worm wheel are ensured, the up-and-down movement and the rotation of the needle rod are not interfered with each other, the needle rod can rotate for a certain angle along with the trend of a sewing pattern in sewing, the consistency and the attractiveness of stitches are improved, and the probability of thread breakage is reduced.

However, in the prior art, in order to drive the needle bar to rotate, the inner hole of the worm wheel needs to be designed with a non-circular surface which is the same as the sliding part of the needle bar (i.e. the clamping surface in the above patent), but the scheme has high requirements on the processing of the inner hole of the worm wheel and is difficult to ensure the fit clearance; the rotation limitation is implemented on the non-cylindrical plane part on the needle rod through the limiting pins, the processing difficulty of the scheme is lower than that of the scheme in the front, but the risk exists in the locking of the limiting pins, and the limiting pins can be loosened during long-time movement, so that the gap is formed between the needle rod and the worm wheel in the rotating direction.

SUMMERY OF THE UTILITY MODEL

The utility model aims at having the above-mentioned problem to current technique, provided a sewing machine's needle bar rotary mechanism, the utility model aims to solve the technical problem that: how to reduce the probability that the clearance appears between needle bar and the driving medium in the direction of rotation, improve sewing stability.

The purpose of the utility model can be realized by the following technical proposal:

a needle bar rotating mechanism of a sewing machine comprises a machine shell and a needle bar, wherein the needle bar is movably arranged on the machine shell, and the needle bar rotating mechanism is characterized by comprising a rotating driving source fixed on the machine shell, the output end of the rotating driving source is provided with a driving part, a driven part synchronously rotating with the driving part is rotatably arranged on the machine shell, the driven part is provided with a through hole along the vertical direction, the needle bar penetrates through the through hole, and the side wall of the needle bar is provided with a groove along the vertical direction; the side wall of the driven piece is provided with a limiting hole communicated with the through hole, a limiting part is arranged in the limiting hole, the inner end of the limiting part is provided with a limiting part, the limiting part is located in the groove, and two sides of the limiting part are in sliding contact with two side walls of the groove.

The working principle is as follows: during sewing, the needle rod reciprocates up and down to drive the needle to move to realize sewing. When the sewing pattern is in arc-shaped non-linear condition, the rotary driving source can drive the driving part to drive the driven part to rotate, the limiting part is designed on the driven part, the limiting part of the limiting part is positioned in the groove, and two sides of the limiting part are in sliding contact with two side walls of the groove. Because the limiting part on the limiting part is positioned in the groove of the needle rod, even if the limiting part looses, as long as the limiting part is still positioned in the groove, a gap can not be generated in the rotating direction, the needle rod can be normally driven to rotate, and the sewing stability is improved; in the prior art, once the limiting part loosens, the limiting part is separated from the clamping surface between the needle bars, and the limiting part and the clamping surface are in clearance in the rotating direction, so that sewing stitches can be influenced.

In the above needle bar rotating mechanism of a sewing machine, as an aspect, the driving member includes a worm connected to an output end of the rotary driving source, and the driven member includes a worm wheel sleeved on the needle bar, and the worm is engaged with the worm wheel. The worm is driven to rotate by the rotary driving source, so that the worm wheel is driven to rotate, and finally the needle rod is driven to rotate.

In the above-mentioned needle bar rotating mechanism of a sewing machine, as another scheme, the driving member includes a driving bevel gear connected to an output end of the rotary driving source, and the driven member includes a driven bevel gear sleeved on the needle bar, the driving bevel gear being engaged with the driven bevel gear. The rotary driving source drives the driving bevel gear to rotate, so as to drive the driven bevel gear to rotate, and finally drive the needle rod to rotate.

In foretell needle bar rotary mechanism of sewing machine, the rotary drive source is including being fixed in motor on the casing, the output shaft of motor sets up along the horizontal direction, the worm is coaxial and be connected with the output shaft of motor, the axis of worm wheel sets up along vertical direction, spacing hole sets up along the radial of worm wheel.

In the needle bar rotating mechanism of the sewing machine, the limiting part comprises an anti-rotation pin inserted in the limiting hole, the limiting part is a protrusion at the inner end of the anti-rotation pin, the protrusion is positioned in the groove of the needle bar, and two sides of the protrusion are in zero clearance fit with two side walls of the groove. The worm gear is provided with the limiting hole, transmission is realized through the scheme that the anti-rotation pin is matched with the groove, and compared with the scheme that the groove is directly formed in the worm gear and is matched with the needle rod, the processing difficulty of the worm gear can be reduced.

In the needle bar rotating mechanism of the sewing machine, the side wall of the worm wheel is provided with a positioning hole which is perpendicular to and communicated with the limiting hole, and a positioning part which can tightly abut against the side wall of the limiting part is arranged in the positioning hole. During installation, the limiting part can be inserted into the limiting hole firstly and adjusted to a preset position, and then the positioning part is installed in the positioning hole and abuts against the limiting part, so that the limiting part is fixed.

In the needle bar rotating mechanism of the sewing machine, the grooves on the needle bar are provided with a plurality of grooves, and the limiting holes and the limiting parts correspond to the grooves one to one.

Compared with the prior art, the utility model has the advantages of it is following:

1. because the limiting part on the limiting part is positioned in the groove of the needle rod, even if the limiting part looses, as long as the limiting part is still positioned in the groove, a gap can not be generated in the rotating direction, the needle rod can be normally driven to rotate, and the sewing stability is improved;

2. spacing hole is designed on the worm wheel, transmission is realized through the scheme that the anti-rotation pin is matched with the groove, and the processing difficulty of the worm wheel can be reduced.

Drawings

Fig. 1 is a schematic structural view of the needle bar rotating mechanism mounted on a sewing machine.

Fig. 2 is a schematic structural view of the present needle bar rotating mechanism.

Fig. 3 is an exploded view of the present needle bar rotating mechanism.

Fig. 4 is a longitudinal sectional view of the worm wheel mounted on the needle bar.

Fig. 5 is a cross-sectional view of the worm wheel mounted to the needle bar.

In the figure, 1, a housing; 2. a needle bar; 21. a groove; 3. a rotary drive source; 31. a motor; 4. a driving member; 41. a worm; 5. a driven member; 51. a worm gear; 52. a through hole; 53. a limiting hole; 54. positioning holes; 6. a limiting member; 61. a limiting part; 7. a positioning member; 8. a coupling is provided.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1, the sewing machine includes a housing 1 and a needle bar 2, the needle bar 2 is movably disposed on the housing 1, and a driving device capable of driving the needle bar 2 to reciprocate up and down is disposed on the housing 1. The driving device may include a motor and a needle bar shaft, and the driving device realizes transmission through a connecting rod and the like so as to drive the needle bar 2 to reciprocate up and down, and of course, other solutions may also be adopted, the contents of which are the prior art, such as patent documents CN109554846A and the like, and are not described herein again.

As shown in fig. 1, 2 and 3, the needle bar rotating mechanism includes a rotating drive source 3 fixed on a casing 1, an output end of the rotating drive source 3 is provided with a drive member 4, a driven member 5 rotating synchronously with the drive member 4 is rotatably arranged on the casing 1, the driven member 5 is provided with a through hole 52 along a vertical direction, a needle bar 2 passes through the through hole 52, and a groove 21 is formed on a side wall of the needle bar 2 along the vertical direction; the side wall of the driven member 5 is provided with a limiting hole 53 communicated with the through hole 52, a limiting member 6 is arranged in the limiting hole 53, the inner end of the limiting member 6 is provided with a limiting part 61, the limiting part 61 is positioned in the groove 21, and two sides of the limiting part 61 are in sliding contact with two side walls of the groove 21.

Specifically, in the present embodiment, the driving member 4 includes a worm 41 connected to an output end of the rotation driving source 3, the driven member 5 includes a worm wheel 51 fitted over the needle bar 2, and the worm 41 is engaged with the worm wheel 51. Of course, as other solutions, the driving member 4 may also include a driving bevel gear connected to the output end of the rotary driving source 3, and the driven member 5 includes a driven bevel gear sleeved on the needle bar 2, and the driving bevel gear is engaged with the driven bevel gear. Only the power output by the rotary driving source 3 can be transmitted to the needle bar 2 to drive the needle bar 2 to rotate.

Preferably, in the present embodiment, the rotation driving source 3 includes a motor 31 fixed to the housing 1, an output shaft of the motor 31 is disposed along a horizontal direction, a worm 41 is coaxially and connected to the output shaft of the motor 31, an axis of the worm wheel 51 is disposed along a vertical direction, and a limiting hole 53 is disposed along a radial direction of the worm wheel 51.

It should be noted that the distribution of the motor 31, the worm 41 and the worm wheel 51 is not limited to the embodiment and the description shown in the drawings, and those skilled in the art can make corresponding adjustments as necessary without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

The connection between the worm 41 and the motor 31 can be realized by using the coupling 8 as described in the present embodiment, or can be realized by using other connecting members, even by designing a direct connection structure.

When the driving part and the driven part adopt the driving bevel gear and the driven bevel gear, the driving and layout mode can still be selected. Even under the premise that the assembly space of the sewing machine is enough, the driving part and the driven part can be straight gears. In summary, the driving member 4 and the driven member 5 in the present application cover a mechanical structure capable of realizing rotation transmission.

Preferably, the plurality of grooves 21 on the needle bar 2 are provided, and the limiting holes 53 and the limiting pieces 6 correspond to the grooves 21 one by one. In this embodiment, there are two grooves 21 on the needle bar 2, and the two grooves 21 are symmetrically distributed about the center line of the needle bar 2; the limiting holes 53 and the limiting pieces 6 correspond to the grooves 21 one by one. Of course, the number of the grooves 21 can be adjusted according to actual needs.

As further preferred, as shown in fig. 4 and 5, the position-limiting member 6 includes an anti-rotation pin inserted into the position-limiting hole 53, the position-limiting portion 61 is a protrusion at an inner end of the anti-rotation pin, the protrusion is located in the groove 21 of the needle bar 2, and two sides of the protrusion are in clearance-free fit with two side walls of the groove 21.

It should be noted that, in the present embodiment, the shape of the limiting portion 61 is selected to be cylindrical, but as another scheme, it may also be designed to be square, only the two sides of the limiting portion are required to be in clearance-free fit with the two side walls of the groove 21, so that the needle rod can be driven to rotate while the worm wheel 51 rotates while the needle rod reciprocates up and down relative to the limiting portion 6.

It should be noted here, of course, that in order to ensure the precision and stability of the rotation of the needle bar 2, the gap between the limiting part 61 of the limiting part 6 and the groove 21 on the needle bar 2 is reduced as much as possible, but it is not equal to the increase of the gap by those skilled in the art, which deviates from the spirit of the present invention or exceeds the scope defined by the appended claims.

As shown in fig. 3, 4 and 5, in order to fix the limiting member 6, in the embodiment, a positioning hole 54 perpendicular to and communicated with the limiting hole 53 is formed on a side wall of the worm wheel 51, and a positioning member 7 capable of abutting against the side wall of the limiting member 6 is disposed in the positioning hole 54.

Specifically, the positioning hole 54 may be designed as a threaded hole, and the positioning member 7 may be designed as a screw, a bolt, or the like to be threadedly coupled thereto.

Of course, in order to fix the limiting member 6, the limiting hole 53 may be designed as a threaded hole instead of the positioning hole 54, and the limiting member may be designed as a threaded fastener which is in threaded engagement with the threaded hole.

The working principle of the utility model is as follows: during sewing, the needle rod 2 reciprocates up and down, so that the needle is driven to move to realize sewing. When the sewing pattern is in arc-shaped or other non-linear conditions, the rotary driving source 3 can drive the driving part 4 to drive the driven part 5 to rotate, the limiting part 6 is designed on the driven part 5, the limiting part 61 of the limiting part 6 is positioned in the groove 21, and two sides of the limiting part 61 are in sliding contact with two side walls of the groove 21, therefore, when the driven part 5 rotates, the needle rod 2 can be driven to rotate by matching of the limiting part 61 and the groove 21 and be matched with the sewing pattern, meanwhile, the up-and-down motion of the needle rod 2 cannot be influenced due to the sliding contact of the limiting part 61 and the groove 21, and therefore, the sewing direction can be guaranteed to be consistent with the preset stitch.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. A needle bar rotating mechanism of a sewing machine comprises a machine shell (1) and a needle bar (2), wherein the needle bar (2) is movably arranged on the machine shell (1), and is characterized in that the needle bar rotating mechanism comprises a rotating driving source (3) fixed on the machine shell (1), the output end of the rotating driving source (3) is provided with a driving part (4), a driven part (5) which synchronously rotates with the driving part (4) is rotatably arranged on the machine shell (1), the driven part (5) is provided with a through hole (52) along the vertical direction, the needle bar (2) penetrates through the through hole (52), and the side wall of the needle bar (2) is provided with a groove (21) along the vertical direction; the side wall of the driven part (5) is provided with a limiting hole (53) communicated with the through hole (52), a limiting part (6) is arranged in the limiting hole (53), the inner end of the limiting part (6) is provided with a limiting part (61), the limiting part (61) is located in the groove (21), and two sides of the limiting part (61) are in sliding contact with two side walls of the groove (21).

2. A needle bar rotating mechanism of a sewing machine according to claim 1, wherein the driving member (4) includes a worm (41) connected to an output end of the rotary driving source (3), and the driven member (5) includes a worm wheel (51) fitted over the needle bar (2), and the worm (41) is engaged with the worm wheel (51).

3. A needle bar rotating mechanism according to claim 1, wherein the driving member (4) includes a driving bevel gear connected to an output end of the rotary driving source (3), and the driven member (5) includes a driven bevel gear fitted around the needle bar (2), the driving bevel gear being engaged with the driven bevel gear.

4. A needle bar rotating mechanism of a sewing machine according to claim 2, wherein the rotary drive source (3) includes a motor (31) fixed to the housing (1), an output shaft of the motor (31) is arranged in a horizontal direction, the worm (41) is coaxial and connected to the output shaft of the motor (31), an axis of the worm wheel (51) is arranged in a vertical direction, and the limit hole (53) is arranged in a radial direction of the worm wheel (51).

5. A needle bar rotating mechanism according to claim 1, 2, 3 or 4, wherein the limiting member (6) comprises an anti-rotation pin inserted into the limiting hole (53), the limiting portion (61) is a protrusion at an inner end of the anti-rotation pin, the protrusion is located in the groove (21) of the needle bar (2), and two sides of the protrusion are in gapless fit with two side walls of the groove (21).

6. The needle bar rotating mechanism of the sewing machine according to claim 4, wherein a positioning hole (54) perpendicular to and communicating with the limiting hole (53) is formed in a side wall of the worm wheel (51), and a positioning member (7) capable of abutting against a side wall of the limiting member (6) is arranged in the positioning hole (54).

7. A needle bar rotating mechanism of a sewing machine according to claim 1, 2, 3 or 4, wherein there are a plurality of grooves (21) on the needle bar (2), and the limiting holes (53) and the limiting pieces (6) are in one-to-one correspondence with the grooves (21).