Needle bar structure

Abstract

The utility model provides a needle bar structure which comprises a needle bar and an upper head block arranged on the needle bar in an injection molding mode, and at least one annular groove and at least one tangent plane limiting rotation of the needle bar are arranged at the position, matched with the upper head block, of the needle bar. The upper head block is positioned before injection molding, so that the needle chuck hole of the needle rod and the upper head block form a specific angle, then injection molding is performed, the error is small, the production cost is low, and the mounting step is omitted.

Description

TECHNICAL FIELD

[0001] The utility model relates to embroidery machine technical field especially a needle bar structure. BACKGROUND

[0002] There is a needle bar in the prior art, an injection molded upper head block is arranged at the upper end of the needle bar, the injection molded upper head block is installed in cooperation with the needle bar, the upper head block has a specific preset angle with the needle clamp hole of the needle bar after installation, therefore, a positioning structure is arranged on the needle bar and the upper head block to form a specific required angle between the needle clamp hole of the needle bar and the upper head block, which results in high production and assembly cost. SUMMARY

[0003] In order to solve the problems of the prior art, the utility model provides a needle bar structure, which directly injects the upper head block on the needle bar, thereby omitting the installation steps of the upper head block and the needle bar, directly forming a specific angle between the needle clamp hole of the needle bar and the upper head block before injection, and then injection molding, with small error and low production cost.

[0004] The technical scheme adopted is as follows:

[0005] A needle bar structure comprises a needle bar and an upper head block injection molded on the needle bar, and at least one annular groove and at least one cutting surface for positioning are arranged at the cooperation position of the needle bar and the upper head block.

[0006] Further, two annular grooves are arranged in sequence on the upper head block.

[0007] Further, the upper head block is provided with a convex column injection molded to wrap the needle bar.

[0008] Further, the convex column is provided with an installation hole formed after injection and matched with the needle bar.

[0009] Compared with the prior art, the utility model has the beneficial effects that:

[0010] The utility model provides a needle bar structure, which injects the upper head block at the upper end of the needle bar on the needle bar, and the cooperation position of the needle bar and the upper head block is provided with an annular groove and a cutting surface, the plastic is matched more closely with the needle bar during injection, and the needle bar is not easy to fall off. Through the injection setting, the upper head block can be directly injection molded on the needle bar, without the need of setting an installation hole in advance for installation, thereby omitting the processing and installation steps, directly positioning during injection, forming the required angle between the upper head block and the needle bar, molding fixation, low cost, and convenient operation. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 Partially disassembled view of the utility model;

[0012] Figure 2 Perspective view of the utility model;

[0013] Wherein, needle bar 1, upper head block 2, convex column 3, ring groove 4, cutting surface 5. DETAILED DESCRIPTION

[0014] The utility model will be further described below in combination with specific embodiments.

[0015] REFERENCE Figure 1 , 2 A needle bar structure, comprising a needle bar 1 and an upper head block 2 that can be directly injection molded onto the needle bar, wherein at least one ring groove 4 and at least one cutting surface 5 for positioning are provided on the needle bar 1 at the cooperation position with the upper head block 2. The ring groove 4 is provided to prevent the needle bar 1 from falling off after injection molding, so that the needle bar 1 cooperates more closely with the upper head block 2. The upper head block 2 can be made of engineering plastic and formed by mold injection. During injection molding, the plastic can be attached to the ring groove 4 provided on the needle bar 1, and after molding, the needle bar 1 is not easy to slip off.

[0016] As a preferred embodiment, two ring grooves 4 can be provided on the upper head block 2 in sequence, so that the upper head block 2 cooperates more closely with the needle bar 1. The cutting surface 5 can be used for auxiliary positioning. The position of the cutting surface 5 can be perpendicular to the center line of the needle clamp hole of the needle bar 1. During injection molding of the upper head block, the position is directly positioned according to the position of the cutting surface 5, and then injection molding is performed for fixation, so that the installation step is omitted, the position of the needle bar 1 and the upper head block 2 does not need to be adjusted to form a specific angle, and one step is completed during injection molding, the error is small, the production cost is low, and the operation is convenient. It is not easy to fall off. Of course, the cutting surface 5 can also be provided at other positions on the outer circumferential surface of the needle bar.

[0017] The cutting surface 5 can further fix the position of the needle bar 1. Since the needle bar 1 is cylindrical, if the attachment effect is not good when the needle bar 1 cooperates with the upper head block 2, the needle bar 1 is easy to rotate in the installation hole. If the cutting surface 5 is provided, the needle bar 1 is not easy to rotate and slide, and the fixing effect is better.

[0018] The upper head block 2 is provided with a convex column 3 that injection molds and wraps the needle bar 1. The convex column 3 is provided with an installation hole that is formed after injection molding and cooperates with the needle bar. The convex column 3 can increase the contact surface of the upper head block 2 and the needle bar 1, and the connection is more closely. At the same time, the height of the part of the upper head block 2 that exceeds the needle bar can be reduced, the volume of the upper head block 2 can be reduced, and the space occupied is smaller.

[0019] In the prior art, a metal upper head block is usually used, a certain precision installation hole needs to be provided, and the needle clamp hole of the needle bar needs to be at a certain angle with the upper head block, which increases the difficulty of positioning. At the same time, a pin needs to be used for fixation during installation. The utility model not only reduces the installation steps, but also has low cost and simple positioning.

[0020] The above only describes optional embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation made by using the content of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A needle bar structure characterized by: The utility model relates to a needle rod (1), an upper head block (2) injection molded on the needle rod, at least one annular groove (4) and at least one cutting surface (5) limiting rotation of the needle rod are arranged on the needle rod (1) in cooperation with the upper head block (2).

2. The needle bar structure of claim 1 wherein: Two annular grooves (4) are arranged on the upper head block (2) in sequence from top to bottom.

3. The needle bar structure of claim 1 wherein: The upper head block (2) is provided with a convex column (3) injection molded to wrap the needle rod (1).

4. The needle bar structure of claim 3 wherein: The convex column (3) is provided with an installation hole formed after injection molding and matched with the needle rod.

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