A rotary needle mechanism

Abstract

This utility model relates to a rotating needle mechanism, including a needle bar installed inside a machine housing. The needle bar has a hollow tubular structure and also includes a fixed sleeve, a transmission sleeve, a needle holder, and a stepper motor. The fixed sleeve is fixedly connected to the machine housing. The upper end of the transmission sleeve is inserted into the fixed sleeve. The upper end of the needle holder is connected to the inner wall of the needle bar. The outer wall of the lower end of the needle holder and the inner wall of the transmission sleeve have a spline structure that mates with each other. The needle holder has a needle insertion hole with an opening facing downwards, into which a sewing needle is inserted. The needle bar rotating mechanism of this utility model has stronger adaptability and can be compatible with multiple types of template machines and sewing scenarios. The core components of this mechanism adopt a modular design: the fixed sleeve is fixed to the machine housing by bolts. Only the length of the fixed sleeve needs to be adjusted according to the machine housing size of different template machines to achieve quick adaptation without redesigning the overall structure of the mechanism.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, and in particular to a rotating needle mechanism. Background Technology

[0002] As consumer demand for decorative and personalized product designs continues to rise, automated production in the industry is placing new demands on sewing equipment, requiring it to reliably complete complex pattern sewing with threads moving in any direction. Traditional sewing machines have inherent limitations in their motion structure, requiring operators to repeatedly adjust fabric positioning, change specialized auxiliary tools, or interrupt sewing multiple times to correct the stitch path.

[0003] Currently, template machines capable of adapting to complex sewing patterns have appeared on the market. For example, referring to the utility model patent with patent publication number CN 210368223 U, a template machine head with a rotatable needle bar is disclosed. The rotation drive mechanism in this application is driven by a transmission belt to the lower drive shaft, and the angle can be adjusted in real time according to the sewing path. However, this template machine still has defects: High structural complexity: In order to achieve stable rotation and precise angle positioning of the needle bar, multiple sets of transmission gears and high-precision guide rails are required, resulting in redundancy in the overall structure of the equipment, and the precision requirements for the cooperation between the components are extremely high. High overall cost: The complex structure not only increases the difficulty of processing and procurement costs of parts, but also increases the complexity of equipment assembly, making it easy for assembly errors to affect equipment stability; In addition, the fact that the drive mechanism is located above the lower drive shaft increases the size of the template machine itself, occupies a lot of space, and makes operation inconvenient. Summary of the Invention

[0004] This invention provides a rotating needle mechanism that solves the aforementioned problems in existing sewing machines.

[0005] The present invention adopts the following technical solution: A rotating needle mechanism includes a needle bar installed inside a housing, the needle bar having a hollow tubular structure, a fixed sleeve, a transmission sleeve, a needle holder, and a stepper motor. The fixed sleeve is fixedly connected to the housing, the upper end of the transmission sleeve is inserted into the fixed sleeve, the upper end of the needle holder is rotatably connected to the inner wall of the needle bar, the lower end of the outer wall of the needle holder and the inner wall of the transmission sleeve have a spline structure that matches each other, the needle holder has a needle insertion hole with an opening facing downward, a sewing needle is inserted into the needle insertion hole, the upper surface of the needle holder has a first threading hole adjacent to the needle insertion hole, the first threading hole extends longitudinally through the needle holder, the outer wall of the needle bar has a second threading hole, the outer wall of the fixed sleeve has a third threading hole and a gear hole, the upper end of the transmission sleeve has a driven gear extending into the gear hole, and the stepper motor is used to drive and connect the driven gear.

[0006] Furthermore, the outer wall of the needle holder is provided with an inner annular groove, and a bead loading channel is provided between the inner annular groove and the needle loading hole. The inner wall of the needle bar is provided with an outer annular groove, and the outer annular groove and the inner annular groove cooperate to form an annular bead channel, in which a number of rolling balls are installed.

[0007] Furthermore, the inner wall of the aforementioned transmission sleeve is provided with an internal spline, and the outer wall of the aforementioned needle seat is provided with an external spline that matches the internal spline.

[0008] Furthermore, the output end of the aforementioned stepper motor is provided with a motor gear, which is connected to the aforementioned driven gear via a transmission gear or a transmission belt.

[0009] Furthermore, the outer wall of the needle holder is provided with a screw hole that connects to the needle mounting hole, and a screw for locking the sewing needle is inserted into the screw hole.

[0010] Furthermore, the aforementioned first threading hole has a funnel-shaped structure.

[0011] Furthermore, the length of the aforementioned ball-loading channel is equal to the diameter of the ball.

[0012] As can be seen from the above description of the structure of this utility model, compared with the prior art, this utility model has the following advantages: 1. The needle bar rotation mechanism of this utility model drives the sewing needle to rotate through a transmission sleeve. The needle bar is designed with a long thread hole, which allows the sewing needle to rotate in multiple directions without being affected by the needle thread. The needle seat and the transmission sleeve are splined together, and the angle adjustment precision control of the sewing needle is far superior to the positioning error caused by the "multi-set gear transmission clearance" in the prior art. The existing thread path cannot work with the needle bar perpendicular to the same direction. The new model, through the long thread hole of the needle bar, can be aligned with the standard sewing machine thread path to achieve the best thread tightening effect. The splined fit can withstand greater radial force and avoid radial movement when the sewing needle rotates at high speed, ensuring the straightness and curvature accuracy of the thread path when sewing complex patterns.

[0013] 2. The stepper motor and passive gear transmission structure of this utility model does not require additional downward extension installation space; the core motion components (needle bar, needle seat, transmission sleeve) are arranged in a coaxial stacked layout, and the radial space occupied is only 1 / 2 of the existing mechanism. It can be directly adapted to the compact machine head design of small and medium-sized template machines, avoiding the problem of crowded operating space caused by excessive equipment size. It is especially suitable for multi-machine parallel operation on narrow worktables.

[0014] 3. The needle bar rotation mechanism of this utility model has stronger adaptability and can be compatible with multiple types of template machines and sewing scenarios. The core components of this mechanism (fixed sleeve, transmission sleeve, needle seat) adopt a modular design: the fixed sleeve is fixed to the machine housing by bolts. Only the length of the fixed sleeve needs to be adjusted according to the machine housing size of different template machines to achieve quick adaptation without redesigning the overall structure of the mechanism. At the same time, the speed and angle of the stepper motor can be flexibly adjusted by pulse signals, which can meet the needs of low-speed fine sewing of thin materials (such as silk) and also adapt to high-speed stable sewing of thick materials (such as denim). The scenario compatibility is better than that of existing template machines that require the replacement of special auxiliary tooling. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the needle bar rotating mechanism and the housing of this utility model. Figure 1 .

[0016] Figure 2 This is a schematic diagram of the needle bar rotating mechanism and the housing of this utility model. Figure 2 .

[0017] Figure 3 for Figure 1 A magnified structural diagram of part A in the middle.

[0018] Figure 4 This is a schematic diagram of the needle bar and needle seat of this utility model.

[0019] Figure 5 This is a schematic diagram of the structure of the fixing sleeve of this utility model.

[0020] Figure 6 This is a schematic diagram of the transmission sleeve of this utility model.

[0021] Figure 7 This is a schematic diagram of the needle bar of this utility model.

[0022] The components are as follows: 1. Fixed sleeve; 2. Transmission sleeve; 3. Needle holder; 4. Stepper motor; 5. Housing; 10. Gear hole; 100. Needle and thread; 101. First thread hole; 102. Second thread hole; 103. Third thread hole; 21. Driven gear; 22. Internal spline; 30. Needle hole; 31. Sewing needle; 32. Bead loading channel; 33. Ball bearing; 34. Inner annular groove; 35. External spline; 300. Annular bead track; 301. Screw hole; 41. Motor gear; 42. Transmission gear; 51. Needle bar; 52. Guide sleeve; 53. Follower presser foot; 54. Conductor coil; 55. Swing arm. Detailed Implementation

[0023] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0024] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0025] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this utility model, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, the terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this utility model.

[0026] Reference Figures 1-6 A needle bar 51 rotating mechanism includes a needle bar 51 installed inside a housing 5. The needle bar 51 has a hollow tubular structure. It also includes a fixed sleeve 1, a transmission sleeve 2, a needle holder 3, and a stepper motor 4. The housing 5 has a guide sleeve 52 fitted around the outside of the needle bar 51. The fixed sleeve 1 is fixed to the housing 5 and fits onto the outer wall of the guide sleeve 52. The housing 1 has a follower presser foot 53 that mates with a sewing needle. The upper end of the transmission sleeve 2 is inserted into the fixed sleeve 1, and the transmission sleeve 2 can rotate around an axis within the fixed sleeve 1. The upper end of the needle holder 3 is inserted into the lower end of the needle bar 51. The upper end of the needle holder 3 is rotatably connected to the inner wall of the needle bar 51. The outer wall of the lower end of the needle holder 3 and the inner wall of the transmission sleeve 2 are a spline structure that fits each other. The needle holder 3 is provided with a needle hole 30 with the opening facing downward. A sewing needle 31 is inserted into the needle hole 30. The upper surface of the needle holder 3 is provided with a first thread hole 101 adjacent to the needle hole 30. The first thread hole 101 passes through the needle holder 3 longitudinally. The outer wall of the needle bar 51 is provided with a second thread hole 102. The outer wall of the fixed sleeve 1 is provided with a third thread hole 103 and a gear hole 10. The upper end of the transmission sleeve 2 is provided with a driven gear 21 extending into the gear hole 10. The stepper motor 4 is used to drive and connect the driven gear 21.

[0027] Reference Figures 1-3The outer wall of the needle holder 3 is provided with an inner annular groove 34, and a bead loading channel 32 is provided between the inner annular groove 34 and the needle loading hole 30. The inner wall of the needle rod 51 is provided with an outer annular groove 510, and the outer annular groove 510 and the inner annular groove 34 cooperate to form an annular bead channel 300, and a number of balls 33 are installed in the annular bead channel 300. During installation, the needle holder 3 is inserted into the bottom of the needle bar 51. The ball bearing 33 enters the ball bearing channel 32 through the needle hole 30. At the same time, the previous ball bearing 33 in the ball bearing channel 32 is pushed into the annular ball channel 300 until the ball bearing 33 fills the annular ball channel 300. The ball bearing channel 32 retains one ball bearing 33, which prevents the ball bearing 33 in the annular ball channel 300 from returning to the ball bearing channel 32. The annular ball channel 300 prevents the needle holder 3 from falling off the needle bar 51. The needle holder 3 is rotatably connected to the inner wall of the needle bar 51 through multiple balls bearing 33. The sewing needle 31 is inserted into the needle hole 30. The sewing needle 31 prevents the ball bearing 33 in the ball bearing channel 32 from returning.

[0028] Reference Figure 1 , Figure 3 and Figure 5 The inner wall of the transmission sleeve 2 is provided with an inner spline 22, and the outer wall of the needle holder 3 is provided with an outer spline 35 that cooperates with the inner spline 22. The transmission sleeve 2 guides the needle rod 51 to maintain precision lifting and lowering through the cooperation of the inner spline 22 and the outer spline 35. At the same time, the sewing needle 31 can rotate synchronously with the transmission sleeve 2 to adapt to the needs of thread routing in any direction.

[0029] Reference Figure 1 The output end of the stepper motor 4 is provided with a motor gear 41, which is connected to the passive gear 21 through a transmission gear 42 or a transmission belt. Preferably, the motor gear 41 is connected to the passive gear 21 through the transmission gear 42.

[0030] Reference Figure 2 The outer wall of the needle holder 3 is provided with a screw hole 301 that connects to the needle mounting hole 30. A screw for locking the sewing needle 31 is inserted into the screw hole 301.

[0031] Reference Figure 2 The first threading hole 101 has a funnel-shaped structure, which facilitates the thread to pass through the needle holder 3 and smoothly thread the sewing needle 31. During threading, the thread 100 passes through the swing arm 55 of the machine housing and the guide coil 54, and then passes through the third threading hole 103, the second threading hole 102, and the first threading hole 101 in sequence. The thread 100 is then guided into the needle holder threading hole (i.e., the first threading hole 101) through the long hole of the needle bar (i.e., the second threading hole 102), so that the thread will not tangle when the sewing needle 31 rotates, making it suitable for complex pattern sewing with threads in any direction.

[0032] The length of the aforementioned bead-filling channel 32 is equal to the diameter of the ball 33. The sewing needle 31 abuts against the ball 33 in the bead-filling channel 32. The ball 33 in the bead-filling channel 32 prevents the ball 33 in the annular bead track 300 from returning. The structural design is reasonable.

[0033] In use, the needle bar 51 is mechanically raised and lowered according to the instructions of the receiving control module. The stepper motor 4 controls the motor gear 41 to rotate according to the instructions of the receiving control module. The motor gear 41 drives the passive gear 21 to rotate through the transmission gear. The transmission sleeve 2 rotates synchronously with the passive gear 21. The transmission sleeve 2 drives the needle holder 3 to rotate through the spline structure. The sewing needle 31 rotates synchronously with the needle holder 3.

[0034] The above are merely specific embodiments of this utility model, but the design concept of this utility model is not limited thereto. Any non-substantial modifications made to this utility model using this concept shall be considered as an infringement of the protection scope of this utility model.

Claims

1. A rotating needle mechanism, comprising a needle bar installed within a housing, the needle bar having a hollow tubular structure, characterized in that: It also includes a fixed sleeve, a transmission sleeve, a needle holder, and a stepper motor. The fixed sleeve is fixed to the machine housing. The upper end of the transmission sleeve is inserted into the fixed sleeve. The upper end of the needle holder is connected to the inner wall of the needle bar. The outer wall of the lower end of the needle holder and the inner wall of the transmission sleeve have a spline structure that matches each other. The needle holder has a needle hole with an opening facing downward. A sewing needle is inserted into the needle hole. The needle holder has a first thread hole adjacent to the needle hole. The outer wall of the needle bar has a second thread hole. The outer wall of the fixed sleeve has a third thread hole and a gear hole. The upper end of the transmission sleeve has a driven gear that extends into the gear hole. The stepper motor is used to drive and connect the driven gear.

2. The rotating needle mechanism as described in claim 1, characterized in that: The outer wall of the needle holder is provided with an inner annular groove, and a bead loading channel is provided between the inner annular groove and the needle loading hole. The inner wall of the needle bar is provided with an outer annular groove, which cooperates with the inner annular groove to form an annular bead channel, and a number of rolling balls are installed in the annular bead channel.

3. The rotating needle mechanism as described in claim 1, characterized in that: The inner wall of the transmission sleeve is provided with an internal spline, and the outer wall of the needle seat is provided with an external spline that matches the internal spline.

4. The rotating needle mechanism as described in claim 1, characterized in that: The stepper motor has a motor gear at its output end, which is connected to the driven gear via a transmission gear or a transmission belt.

5. A rotating needle mechanism as described in claim 1, characterized in that: The outer wall of the needle holder is provided with a screw hole that connects to the needle mounting hole, and a screw for locking the sewing needle is inserted into the screw hole.

6. A rotating needle mechanism as described in claim 1, characterized in that: The first threading hole has a funnel-shaped structure.

7. A rotating needle mechanism as described in claim 2, characterized in that: The length of the ball loading channel is equal to the diameter of the ball.

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