Correcting mechanism for rotation angle of needle bar

Abstract

The utility model discloses a needle bar rotation angle deviation rectifying mechanism, which relates to the technical field of sewing equipment and comprises a mounting frame, a longitudinally sliding needle bar, a lifting mechanism for driving the needle bar to move up and down and a rotating mechanism. The rotating mechanism comprises a rotor driven by a motor; a longitudinal through hole of the rotor is in transmission connection with a flat part at the upper part of the needle rod. A guide part is arranged on the mounting frame; symmetrical cambered guide surfaces are arranged at the upper part of the stop block; two guide rods are symmetrically fixed to the outer wall of the needle rod. When the rotation angle of the needle rod deviates from a set value due to assembly errors, the guide rod makes contact with the cambered guide face in the descending process of the needle rod, and the needle rod is forced to be reversely and finely adjusted through sliding guide and automatically corrected to the set angle. The rotor adopts a split type driving wheel and rotating shaft sleeve design, and is linked with a motor through a transmission gear. According to the utility model, the rotation angle deviation can be dynamically eliminated, the accurate sewing direction is ensured, the stitch quality and the production efficiency are improved, and the maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a needle bar rotation angle deviation correction mechanism. Background Art

[0002] In the technical field of sewing equipment, the rotation accuracy of the needle bar directly determines the quality of the sewing stitch, especially in complex stitch or high-precision sewing scenarios. The needle bar of traditional sewing machines usually realizes the rotation function through the drive of a motor. For example, through the transmission connection structure between the rotor and the needle bar (as described in patent CN203174324U), although it can realize the synchronous rotation of the needle bar and the bobbin case, there are still significant defects: the rotation angle of the needle bar is easily affected by assembly errors, part wear, or mechanical clearances during dynamic operation, resulting in the actual rotation angle deviating from the set value. Such deviations will cause the stitching direction of the sewing needle to deviate from the expected stitch, thereby causing problems such as loose, uneven, or misaligned stitches, seriously reducing the product qualification rate.

[0003] In the prior art, although it has been proposed to achieve precise angle control of the needle bar through a servo motor or a stepper motor, during the actual assembly process, the machining accuracy of parts, installation tolerances, and mechanical deformations after long-term use may all introduce non-negligible angle deviations. Such deviations are difficult to completely eliminate through simple electrical control, and there is a lack of a dynamic deviation correction mechanism, resulting in the need for frequent manual calibration of the equipment, increasing the maintenance cost and affecting the production efficiency. In addition, the existing needle bar rotation mechanisms mostly rely on rigid transmission structures and lack adaptability to instantaneous offsets during operation, making it difficult to meet the requirements of high-precision sewing processes.

[0004] Therefore, there is an urgent need to design a needle bar rotation angle deviation correction mechanism that can automatically compensate for assembly errors and dynamic offsets to correct angle deviations in real time during the up and down movement of the needle bar, ensuring that the rotation angle of the sewing needle is always consistent with the set value, thereby improving the stability and consistency of sewing quality. Summary of the Utility Model

[0005] The purpose of the utility model is to overcome the deficiencies existing in the prior art and provide a needle bar rotation angle deviation correction mechanism.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a needle bar rotation angle correction mechanism, comprising a mounting frame, a needle bar longitudinally slidably arranged on the mounting frame, a lifting mechanism for driving the needle bar to move up and down, and a rotating mechanism for driving the needle bar to rotate; the rotating mechanism comprises a rotor and a motor for driving the rotor to rotate, the rotor is provided with a longitudinal through hole, the upper part of the needle bar is inserted into the longitudinal through hole and is transmission-connected to the rotor and can move up and down along the longitudinal through hole; a guide part is provided on the mounting frame, the guide part has a guide channel for the needle bar to pass through and a guide surface extending along the guide channel; at least one guide rod is integrally or fixedly arranged on the outer wall of the needle bar, and when the needle bar rotation angle deviates from the set value, the guide rod contacts and is guided by the guide surface during the needle bar descending process, so that the needle bar rotation angle is automatically corrected to the set angle.

[0007] As a preferred technical solution of the present utility model, the guide portion is configured as a blocking block, and the guide channel is arranged through the blocking block.

[0008] As a preferred technical solution of the utility model, the guide surface is an arc surface and is arranged on the upper part of the blocking block; two guide rods are symmetrically fixed on the outer wall of the needle rod, and two guide surfaces are symmetrically arranged on the blocking block, and each guide surface is adapted to the corresponding guide rod motion trajectory.

[0009] As a preferred technical solution of the utility model, it also includes a guide assembly arranged on the needle bar, and the lifting mechanism is linked with the guide assembly to drive the guide assembly to drive the needle bar to move up and down, and the guide assembly includes a guide component, a first locking block and a second locking block, the first locking block and the second locking block are respectively sleeved on the outside of the needle bar and fixed by screws, and the two locking blocks are arranged at intervals, the guide component is sleeved on the outside of the needle bar and limited between the two locking blocks, the guide component is fixed relative to the longitudinal position of the needle bar, and the needle bar rotates circumferentially relative to the guide component.

[0010] As a preferred technical solution of the utility model, the rotor includes a transmission wheel and a rotating sleeve inserted in the transmission wheel, the longitudinal through hole is opened in the rotating sleeve, the outer wall of the transmission wheel is provided with a mounting hole, and the rotating sleeve is fixedly connected to the transmission wheel by fasteners.

[0011] As a preferred technical solution of the utility model, a transmission gear is provided on the outer wall of the transmission wheel, the transmission gear is linked to the driving wheel through a chain, and the driving wheel is driven by the motor.

[0012] As a preferred technical solution of the utility model, the longitudinal through hole is a flat hole, the upper part of the needle rod is provided with a flat part adapted to the flat hole, the flat part is inserted into the longitudinal through hole and is transmission-connected to the rotor, and can move up and down along the longitudinal through hole.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows: During the process of the needle bar descending (before contacting the guiding part, the needle bar rotates 180° in advance at a preset angle), the symmetrically arranged guiding rods contact the arc-shaped guiding surface, and through sliding friction or mechanical limit, the needle bar is forced to rotate and fine-tune, so as to eliminate in real time the rotation angle deviation caused by assembly errors or mechanical wear, ensuring that the rotation angle of the sewing needle is always consistent with the set value. Thereby, the tightness, uniformity and consistency of the stitch are significantly improved, effectively solving the problems of loose and misaligned stitches caused by angle deviation in the traditional needle bar mechanism, significantly increasing the qualified rate of sewing products, reducing the frequency of manual calibration, and having the advantages of high precision, high stability and low-cost maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of the present utility model;

[0015] Figure 2 is a schematic structural diagram of the present utility model with the mounting bracket removed;

[0016] Figure 3 is a schematic structural diagram of the mounting bracket of the present utility model.

[0017] Reference numerals: 1, mounting bracket; 2, needle bar; 3, longitudinal through hole; 4, guiding part; 5, guiding channel; 6, guiding surface; 7, guiding rod; 8, blocking block; 9, guiding component; 10, driving wheel; 11, rotating shaft sleeve; 12, mounting hole; 13, driving gear; 14, driving wheel; 15, flat part; 16, chain; 17, guiding component; 18, first locking block; 19, second locking block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] In order to make the technical means, creative features, achieved purposes and functions of the present utility model easy to understand, the present utility model will be further described below in conjunction with specific embodiments and the accompanying drawings. However, the following embodiments are only the preferred embodiments of the present utility model and not all of them. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative efforts all fall within the protection scope of the present utility model.

[0019] The specific embodiments of the present utility model will be described below in conjunction with the accompanying drawings.

[0020] Such as Figures 1 to 3A kind of deviation rectification mechanism for the rotation angle of the needle bar shown, includes a mounting frame 1, a needle bar 2 longitudinally slidably arranged on the mounting frame 1, a lifting mechanism for driving the needle bar 2 to move up and down, and a rotating mechanism for driving the needle bar 2 to rotate; the rotating mechanism includes a rotor and a motor for driving the rotor to rotate. There is a longitudinal through hole 3 on the rotor. The upper part of the needle bar 2 is inserted into the longitudinal through hole 3 and is in transmission connection with the rotor and can move up and down along the longitudinal through hole 3; there is a guiding part 4 on the mounting frame 1. The guiding part 4 has a guiding channel 5 for the needle bar 2 to pass through and a guiding surface 6 extending along the guiding channel 5; at least one guiding rod 7 is integrally or fixedly arranged on the outer wall of the needle bar 2. When the rotation angle of the needle bar 2 deviates from the set value, the guiding rod 7 contacts the guiding surface 6 during the downward movement of the needle bar 2 and is guided by the guiding surface 6, so that the rotation angle of the needle bar 2 is automatically corrected to the set angle.

[0021] The core improvement of the utility model lies in the dynamic deviation rectification mechanism of the rotation angle of the needle bar 2, and the automatic correction function is specifically realized through the contact guidance between the guiding rod 7 and the guiding surface 6. Except for the deviation rectification related structures (including the guiding part 4, the guiding rod 7, the guiding surface 6 and their cooperation relationship), the rest of the components such as the flat cooperation structure between the needle bar 2 and the rotor, the tooth ring linkage mode between the transmission wheel 10 and the motor, the driving principle of the lifting mechanism, the linkage mode between the lifting mechanism and the guiding component 9, etc., all adopt the mature sewing equipment structures in the prior art and no substantial changes are made to them. This design strengthens the deviation rectification function specifically while retaining the stability of the traditional mechanism, avoiding the repeated development cost and ensuring the compatibility and feasibility of the technical solution.

[0022] During the downward movement of the needle bar 2 (before contacting the guiding part 4, the needle bar 2 rotates 180° in advance according to the preset angle), the symmetrically arranged guiding rods 7 contact the arc-shaped guiding surface 6, and the needle bar 2 is forced to rotate and fine-tune through sliding friction or mechanical limit, eliminating the rotation angle deviation caused by assembly errors or mechanical wear in real time, ensuring that the rotation angle of the sewing needle is always consistent with the set value, thereby significantly improving the tightness, uniformity and consistency of the stitch, effectively solving the problems of loose and misaligned stitches caused by the angle deviation of the traditional needle bar 2 mechanism, significantly improving the qualified rate of sewing products, reducing the manual calibration frequency, and having the advantages of high precision, high stability and low-cost maintenance.

[0023] The guiding part 4 is configured as a blocking block 8, and the guiding channel 5 runs through the blocking block 8.

[0024] The guiding surface 6 is an arc surface and is arranged on the upper part of the blocking block 8; two guiding rods 7 are symmetrically and fixedly arranged on the outer wall of the needle bar 2, two of the said guiding surfaces 6 are symmetrically arranged on the blocking block 8, and each guiding surface 6 is adapted to the movement track of the corresponding guiding rod 7. The symmetrically arranged guiding rods 7 cooperate with the arc-shaped guiding surface 6 to provide a smooth guiding effect during the deviation rectification process, reducing impact and wear and prolonging the service life of the mechanism.

[0025] It further includes a guiding component 9 arranged on the needle bar 2. The lifting mechanism is linked with the guiding component 9 and can drive the guiding component 9 to drive the needle bar 2 to move up and down. The guiding component 9 includes a guiding part 17, a first locking block 18 and a second locking block 19. The first locking block 18 and the second locking block 19 are respectively sleeved outside the needle bar 2 and fixed by screws. The two locking blocks are arranged at intervals. The guiding part 17 is sleeved outside the needle bar 2 and limited between the two locking blocks. The longitudinal position of the guiding part 17 relative to the needle bar 2 is fixed, and the needle bar 2 rotates circumferentially relative to the guiding part 17. The guiding part 17, the first locking block 18, the second locking block 19 and the needle bar 2 move up and down synchronously together to complete the sewing work. The linkage mode between the lifting mechanism and the guiding component 9 is the prior art, so it will not be specifically described. The three components can also be made into one body, as long as the needle bar rotates circumferentially relative to the guiding part 17 and the two locking blocks are fixed on the needle bar 2. The specific structure can be designed according to the actual situation.

[0026] The rotor includes a transmission wheel 10 and a rotating shaft sleeve 11 inserted into the transmission wheel 10. A longitudinal through hole 3 is opened in the rotating shaft sleeve 11. An installation hole 12 is provided on the transmission wheel 10. The rotating shaft sleeve 11 and the transmission wheel 10 are fixedly connected by fasteners. The rotor adopts a split design (the transmission wheel 10 and the rotating shaft sleeve 11) and is fixedly connected by fasteners, which is convenient for quickly replacing rotating shaft sleeves 11 of different specifications to adapt to the requirements of various needle bars 2, and at the same time reduces the maintenance difficulty and cost. In this embodiment, the transmission wheel 10, the rotating shaft sleeve 11 and the transmission gear 13 are integrally formed parts, and they can also be separately installed and fixed together.

[0027] A transmission gear 13 is provided on the transmission wheel 10. The transmission gear 13 is linked with the driving wheel 14 through a chain 16. The driving wheel 14 is driven by the motor. The transmission wheel 10 is linked with the motor through the transmission gear 13. Combining the precise control of the servo or stepper motor, the rapid response and precise adjustment of the rotation angle of the needle bar 2 are realized, which adapts to the requirements of complex stitch sewing and greatly improves the production efficiency.

[0028] The longitudinal through hole 3 is a flat hole. The upper part of the needle bar 2 is provided with a flat part 15 adapted to the flat hole. The flat part 15 is inserted into the longitudinal through hole 3 and is in transmission connection with the rotor, and can move up and down along the longitudinal through hole 3. The matching design of the flat hole and the flat part 15 of the needle bar 2 not only ensures the stability of the rotational transmission, but also allows the needle bar 2 to slide freely axially, avoiding movement interference.

[0029] The above has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present utility model and are not used to limit the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A needle bar rotation angle deviation correction mechanism, comprising a mounting frame (1), a needle bar (2) longitudinally slidably arranged on the mounting frame (1), a lifting mechanism for driving the needle bar (2) to move up and down, and a rotation mechanism for driving the needle bar (2) to rotate; the rotation mechanism includes a rotor and a motor for driving the rotor to rotate, a longitudinal through hole (3) is provided on the rotor, and the upper part of the needle bar (2) is inserted into the longitudinal through hole (3) to be in transmission connection with the rotor and can move up and down along the longitudinal through hole (3); characterized in that: The mounting frame (1) is provided with a guide portion (4), the guide portion (4) having a guide channel (5) for the needle bar (2) to pass through and a guide surface (6) extending along the guide channel (5); at least one guide rod (7) is integrally or fixedly provided on the outer wall of the needle bar (2); when the rotation angle of the needle bar (2) deviates from a set value, the guide rod (7) contacts the guide surface (6) during the descent of the needle bar (2) and is guided by the guide surface (6), so that the rotation angle of the needle bar (2) is automatically corrected to the set angle.

2. The needle bar rotation angle deviation correction mechanism according to claim 1, characterized in that: The guide portion (4) is configured as a blocking block (8), and the guide channel (5) is arranged to penetrate the blocking block (8).

3. The needle bar rotation angle deviation correction mechanism according to claim 2, characterized in that: The guide surface (6) is an arc surface and is arranged on the upper part of the blocking block (8); two guide rods (7) are symmetrically fixedly arranged on the outer wall of the needle rod (2), and two guide surfaces (6) are symmetrically arranged on the blocking block (8), and each guide surface (6) is adapted to the motion trajectory of the corresponding guide rod (7).

4. The needle bar rotation angle deviation correction mechanism according to claim 1, wherein: The lifting mechanism further comprises a guide assembly (9) arranged on the needle bar (2); the lifting mechanism and the guide assembly (9) are linked to drive the guide assembly (9) to drive the needle bar (2) to move up and down; the guide assembly (9) comprises a guide component (17), a first locking block (18) and a second locking block (19); the first locking block (18) and the second locking block (19) are respectively sleeved outside the needle bar (2) and fixed by screws; the two locking blocks are arranged at intervals; the guide component (17) is sleeved outside the needle bar (2) and limited between the two locking blocks; the guide component (17) is fixed in a longitudinal position relative to the needle bar (2); the needle bar (2) rotates circumferentially relative to the guide component (17).

5. The needle bar rotation angle deviation correction mechanism according to claim 2, characterized in that: The rotor comprises a transmission wheel (10) and a rotating sleeve (11) inserted into the transmission wheel (10); the longitudinal through hole (3) is opened in the rotating sleeve (11); a mounting hole (12) is provided on the transmission wheel (10); and the rotating sleeve (11) is fixedly connected to the transmission wheel (10) by a fastener.

6. The needle bar rotation angle deviation correction mechanism according to claim 5, characterized in that: The transmission wheel (10) is provided with a transmission gear (13), the transmission gear (13) is linked with a driving wheel (14) through a chain (16), and the driving wheel (14) is driven by the motor.

7. The needle bar rotation angle deviation correction mechanism according to claim 1 or 5, characterized in that: The longitudinal through hole (3) is a flat hole. The upper part of the needle rod (2) is provided with a flat portion (15) adapted to the flat hole. The flat portion (15) is inserted into the longitudinal through hole (3) and is transmission-connected to the rotor, and can move up and down along the longitudinal through hole (3).

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