JPS6138540Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a full-rotation hook for a sewing machine.

During the full rotation of the sewing machine, the outer hook rotates with a track groove formed in the outer hook being guided by a track formed in the inner hook. Therefore, when the sewing machine is operated at high speed, there is a risk of seizure due to the frictional resistance generated at the contact surface between the inner hook and the outer hook. Furthermore, due to the burning, the inner hook tries to rotate in the direction of rotation of the outer hook, creating resistance at the hook stop, which may make it difficult to remove the needle thread from the hook stop when forming stitches, or may cause thread breakage. It was hot.

The purpose of this invention is to reduce the frictional resistance on the contact surface between the inner hook and outer hook to prevent seizing, and to improve thread sliding on the outside of the inner hook to prevent thread breakage when forming seams. To provide a full-rotation hook for a sewing machine that improves thread tightness.

The present invention has an inner hook having a storage chamber for storing a bobbin case, a track is formed on the outer periphery of the inner hook, and a coating made only of titanium nitride is coated on the surface by an ion plating method. The hardness of the titanium nitride coating is
An inner hook having a hardness of 1000 to 2000 Bitkers, and an outer hook having a storage chamber for storing the inner hook, wherein a raceway groove is formed on the inner periphery of the outer hook, and the raceway groove is formed on the inner circumference of the inner hook. A coating made only of titanium nitride is deposited on the surface of the outer hook by ion plating, and the hardness of the titanium nitride coating is 1000 to 1000. an outer hook having a hardness of 2000 Bitkers; a bobbin case having a grip means for holding the bobbin case in the storage chamber of the inner hook, the surface of the bobbin case having a hardness of 1000 to 2000 Bitkers; and a bobbin case in which a coating made only of titanium nitride is deposited by ion plating, the bobbin case is housed in the inner hook, and the inner hook housing the bobbin case is connected to the outer hook. A full-rotation hook for a sewing machine housed in a hook, which prevents thread breakage by reducing the coefficient of friction between the outer hook, inner hook and bobbin case, and improves the hardness and wear resistance of the coating made of titanium nitride. There is a full-rotation hook for a sewing machine, characterized in that the durability of the outer hook, inner hook and bobbin case is improved depending on the height.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of an inner pot 1 according to an embodiment of the present invention. A track 2 is provided protruding from the outer periphery of the inner hook 1 to guide the rotation of an outer hook 10 (shown in a second figure to be described later). Inside the inner hook 1, there is a bobbin on which the bobbin thread is wound and a bobbin case 1 that stores the bobbin.
4 (shown in the third diagram below).
is formed. A hardened metal film 5 made of titanium nitride is formed on the outer periphery of the inner pot 1 including the track 2.

FIG. 2 is a front view of an outer hook 10 according to another embodiment of the present invention. A track groove 11 guided by the track 2 of the inner hook 1 is formed on the inner periphery of the outer hook 10. A storage chamber 12 for storing the inner hook 1 is formed within the outer hook 10. On the inner periphery of the outer hook 10 (inner surface of the storage chamber 12) including the track groove 11, a hardened metal film 13 made of titanium nitride is formed, similarly to the outer periphery of the inner hook 1.

FIG. 3 is a perspective view of the bobbin case 14. The bobbin case 14 is provided with a knob 16 that allows attachment and detachment from the inner hook 1, and a tension spring 15.
is installed. Bobbin case 1 like this
The outer periphery of 4 is coated with a metal cured film 17 in the same manner as described above.

When coating titanium nitride (TiN) on the inner hook 1, outer hook 10, and bobbin case 14,
This is carried out by a so-called ion plating method.
That is, during glow discharge of nitrogen (N) gas, titanium (Ti) is evaporated in the discharge space,
The coatings to which a negative voltage is applied (in the above embodiment, the outer circumference of the inner hook 1, the inner circumference of the outer hook 10, the bobbin case 14)
The coating with the metal cured films 5, 13, 17 is achieved by vapor-depositing titanium nitride (TiN) on the surface of the outer periphery of the metal. When coating the inner hook 1, outer hook 10, and bobbin case 14 with titanium nitride,
Although each surface may be covered,
A portion of each may be coated.

According to the inventor of the present invention, the following advantages have been obtained regarding the metal cured films 5, 13, 17 formed by the ion plating method.

(a) The cured metal film itself has a golden yellow color. Furthermore, the color tone can be adjusted from a strong gold to a strong reddish gold, so if you apply this to the inner hook, outer hook, and bobbin case,
You can make the appearance beautiful.

(b) High hardness. For details, see Bitkers hardness 1000.
The above hardness can be obtained under a relatively wide range of production conditions, and under optimal conditions, a hardness of 2000 on the Vickers scale can be obtained. By obtaining high hardness, the friction resistance of the contact surface between the inner hook and the outer hook is improved.

(c) Low coefficient of friction and good sliding properties prevent thread breakage.

(d) Good heat conduction allows the inner pot, outer pot, and other parts to be cooled easily, improving durability.

(e) Excellent wear resistance due to high Young's modulus.

As described above, according to the present invention, by coating with titanium nitride, the frictional resistance on the contact surface between the inner hook and the outer hook is reduced, so seizure is prevented, and thread slippage on the outer portion of the inner hook is prevented. This improves thread breakage and improves thread tightness during stitch formation.

In particular, according to the present invention, a golden color can be obtained with a controllable color tone by means of a coating layer consisting only of titanium nitride. This gives the inner rotor, outer rotor, and bobbin case a beautiful appearance. Further, the hardness is 1000 to 2000 Vickers hardness, so it is highly hard and the friction resistance of the contact surface between the inner hook and the outer hook is improved. Furthermore, such a coating layer has a low coefficient of friction and good slippage, thereby preventing yarn breakage. Moreover, the coating layer has good thermal conductivity, is easily cooled, and has improved durability.
Furthermore, such a coating layer has a high Young's modulus and excellent wear resistance.

[Brief explanation of the drawing]

FIG. 1 is a front view of an inner hook 1 according to an embodiment of the present invention, FIG. 2 is a front view of an outer hook 10 according to another embodiment of the present invention, and FIG. 3 is a front view of an outer hook 10 according to another embodiment of the present invention. 3 is a perspective view of a bobbin case 14. FIG. 1...Inner hook, 5, 13, 17...Metal hardened film, 10...Outer hook, 14...Bobbin case.

Claims (1)

[Claims for Utility Model Registration] An inner hook has a storage chamber for storing a bobbin case, a track is formed on the outer periphery of the inner hook, and a coating made only of titanium nitride is ion-plated on the surface. an inner pot which is formed by vapor deposition using a titanium nitride coating and has a hardness of 1000 to 2000 Vickers hardness; an outer pot having a storage chamber for storing the inner pot; A raceway groove is formed on the inner periphery of the rotary hook, the raceway groove is formed in a size that supports the raceway of the inner rotor, and a coating made only of titanium nitride is coated on the surface of the outer rotor using an ion plating method. an outer hook, the titanium nitride coating having a hardness of 1000 to 2000 Vickers hardness; and a bobbin case having a grip means for holding the bobbin case in the storage chamber of the inner hook. The bobbin case has a surface having a Vickers hardness of 1000 to 2000 and is formed by depositing a coating made only of titanium nitride by an ion plating method, The inner hook is housed in an inner hook, and the bobbin case is housed in the inner hook, which is a fully rotating hook of the sewing machine that is housed in the outer hook. A full-rotation hook for a sewing machine, which prevents cuts and improves the durability of the outer hook, inner hook, and bobbin case due to the high hardness and wear resistance of the coating made of titanium nitride.