JPH01268591A - Sewing machine frame and bobbin case - Google Patents

Abstract

PURPOSE:To reduce friction between an internal needle bed track band and an external needle bed track band groove, and improve durability, and facilitate the separation of needle thread, by forming a rugged section on the front surface of a frame main-body, and by forming the films of ethylene tetrafluoride, ethylene chloride trifluoride, and polymer. CONSTITUTION:An external needle bed 1 consists of the materials of steel and the like, and the front surface of an external needle bed main-body 10 is formed to be a satin-finish rough face 10a having a plurality of minute rugged sections, and on the front surface, a film 11 is formed, and the film 11 consists of the materials of ethylene tetrafluoride, ethylene chloride trifluoride, the polymer of these, and the like. On the front surface of an internal needle bed 3, a rail 15 fitted on the track groove 12 of the external needle bed 1 is formed, and the front surface of an internal needle bed main-body 13 is set to be a rough face in the same manner, and a film 14 is formed. A bobbin case 7 consists of a bobbin case main-body 16 consisting of the materials of steel and the like, and a film 17. The film 14 on the front surface of the internal needle bed main-body, and the film 17 on the front surface of the bobbin case main-body consist of the materials of ethylene tetrafluoride, ethylene chloride trifluoride, the polymer of these, and the like, in the same manner. Accordingly, friction between an internal needle bed track band and the external needle bed track band groove is reduced, and the feed of lubricant is not needed, and the separation of needle thread is facilitated.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a sewing machine hook and bobbin case.

Conventional technology-a is that when a sewing machine is operated at high speed, friction between the inner hook track and the outer hook track causes seizure between the inner hook track and the outer hook track groove, and noise is generated. Because of this, lubricating oil had to be supplied between the tracks and the tracks. In addition, when the inner hook tries to rotate in the same direction as the outer hook rotation direction due to the rotation of the outer hook, the inner hook locking member that is stuck in the hook locking recess of the inner hook may be damaged on the upstream side of the rotational direction of the recess. The end faces will come into contact. A tensile force is generated in the needle thread passing between the abutting end face and the rotation stopper member, making it difficult to separate the needle thread from the hook stop portion during stitch formation.

Problems to be Solved by the Invention An object of the present invention is to reduce the friction between the inner hook raceway and the outer hook raceway groove as described above, thereby eliminating the need for supplying lubricating oil and improving durability. , the resistance at the hook stopper is reduced to make it easier for the needle thread to come off, and the thread slipping on the outside of the inner hook is improved to reduce thread breakage and form stitches with good thread alignment. The purpose of the present invention is to provide hooks and bobbin cases for sewing machines.

Means for Solving the Problems The present invention forms irregularities on the surface of the hook body, and forms a film of tetrafluoroethylene, trifluorochloroethylene, and a polymer thereof on the irregular surface. There is a sewing machine hook that is characterized by

The hook of the present invention is a sewing machine hook characterized by having an outer hook.

The hook of the present invention is a sewing machine hook characterized by having an inner hook.

The present invention is characterized in that unevenness is formed on the surface of the bobbin case body, and a film of tetrafluoroethylene, trifluorochloroethylene, and a polymer thereof is formed on the uneven surface. This is a sewing machine bobbin case.

According to the present invention, irregularities are formed on the surface of at least one or more of the outer hook body, inner hook body, and bobbin case body of the sewing machine, and the four foot By forming a film of ethylene chloride, trifluoroethylene chloride, and a polymer thereof, the friction between the inner hook raceway belt and the outer hook race track belt is reduced, and the supply of lubricating oil becomes unnecessary. In addition, the resistance at the hook stopper portion is reduced, the needle thread can be easily removed, the thread slipping on the outside portion of the inner hook is improved, thread breakage is reduced, and thread straightness is improved.

Since the surfaces of the outer hook body, inner hook body, and bobbin case body are uneven, the coatings of tetrafluoroethylene, trifluorochloride ethylene, and these polymers are easily absorbed by the outer hook. It is prevented from peeling off from the main body, inner hook main body, and bobbin case main body, and durability is improved.

Furthermore, by operating this sewing machine, tetrafluoroethylene,
Even if the film of trifluorochloroethylene and these polymers wears out, the portion of the film remaining in the recesses of the uneven surface also reduces friction, improving lubricity. The condition is maintained, which also improves durability.

Embodiment FIG. 1 is an exploded perspective view of a vertical full-rotation hook according to an embodiment of the present invention. An outer hook 1 is fixed to a rotating shaft 2, and an inner hook 3 is housed inside the outer hook 1. The stud 4 of the inner hook 3 is inserted into the cylinder part 7a of the bobbin case 7, and the stud 4 of the inner hook 3 is inserted into the cylinder part 7a of the bobbin case 7.
a is inserted into the shaft hole 6 of the bobbin 5 around which the bobbin thread is wound. The bobbin case 7 containing the bobbin 5 can be attached to the inner hook 3. A convex portion 9a of an inner hook stopper member 9 whose base end is fixed to the body of the sewing machine fits into the locking recess 8 of the inner hook 3.

FIG. 2 is a sectional view of the outer hook 1. The outer hook is made of a material such as steel. A film 11 is provided on the surface of the outer hook body 10.
is formed. This outer hook 1 has a raceway groove 12 formed therein.

30 is an enlarged sectional view of section (2) in FIG. 2;

The surface of the outer hook body 10 is formed into a satin-like rough surface 10a having many fine irregularities, and the skin Ill is formed on this surface as described above. Skin II! ill is
For example, tetrafluoroethylene, trifluorochloroethylene,
and their polymers, which are commercially available under the trade name Teflon.

FIG. 4 is a sectional view of the inner pot 3. The inner hook 3 includes an inner hook body 13 made of a material such as steel, and a skin M14 formed on the surface of the inner hook body 13. Inner pot 3
A rail 15 that fits into the rail groove 12 of the outer hook 1 is formed on the surface of the hook. The surface of the inner hook main body 13 is a matte-like rough surface having unevenness like the surface of the outer hook main body 10, and a coating 14 is formed on this rough surface.

FIG. 5 is a sectional view of the bobbin case 7. This bobbin case 7 is a bobbin case body 1 made of material such as steel.
6 and the skin 1 formed on this surface! ! It consists of 17.

The coating 14 on the surface of the inner hook body and the coating 17 on the surface of the bobbin case body, like the coating 11 on the surface of the outer hook body, are made of tetrafluoroethylene, trifluorochloroethylene, and heavy 6-polymers of these. Since it is made of the same material, it is possible to reduce the friction between the inner hook track and the outer hook track during operation of the sewing machine, and it is possible to eliminate the need for lubricating oil supply.

In addition, the resistance at the hook stopper part can be reduced to make it easier to remove the upper thread, and the thread sliding on the outer part of the inner hook can be improved to reduce thread breakage and improve thread tightening. . Furthermore, in the present invention, since a film is formed on the surface of the inner pot, finishing steps such as polishing work can be omitted, making it possible to easily manufacture the entire inner pot, and also having a rust-preventing effect.

The surface of the outer hook 1, the surface of the inner hook 3, and the surface of the bobbin coupe are rough surfaces with satin-like unevenness, and since a film is formed on the rough surfaces, the film will not peel off and its adhesion strength will increase. can be improved. Also, the skin on the surface of this outer hook body II! 11. Even if the coating 14 on the surface of the inner hook body and the skin [17 on the surface of the bobbin case body] are worn and the outer hook body 10, inner hook body 13, and bobbin case body 16 are partially exposed, the surface will not be rough. The film material remains in the recess of the outer hook body 1.
0 and the inner hook body 13 are prevented from coming into direct contact with each other as much as possible to avoid the generation of a large frictional force. Also, generation of large frictional force due to direct contact with the bobbin case body 16 can be avoided as much as possible.

As another embodiment of the present invention, a film may be formed on the surface of at least one of the main bodies of the outer hook 1, the inner hook 3, and the bobbin case 7 as in the above-described configuration. Furthermore, the present invention can be implemented not only for vertical full-rotation hooks but also for horizontal full-rotation hooks.

Effects of the Invention As described above, according to the present invention, each surface of the outer hook body, inner hook body, and bobbin case body of a sewing machine is coated with tetrafluoroethylene, trifluorochloroethylene, and a polymer thereof. By forming a film, the friction between the inner hook raceway and the outer hook raceway groove is reduced, eliminating the need for lubricating oil to be interposed between these raceways and the raceway edge, thus reducing the supply of lubricating oil. becomes unnecessary. In addition, the outer hook body,
The film is prevented from peeling off by being attached to the uneven surfaces formed on each surface of the inner hook body and the bobbin case body. Even if the film is worn out, the film remains in the recesses of the uneven surface, so that improved lubricity is maintained and durability is improved. can.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of the vertical full rotation hook, Fig. 2 is a sectional view of the outer hook 1, Fig. 3 is an enlarged sectional view of the second section ■, Fig. 4 is a sectional view of the inner hook 3, FIG. 5 is a sectional view of the bobbin case 7. 1...Outer hook, 3...Inner hook, 5...Bobbin, 7
．． 1. Bobbin case, 10...outer hook body, 11...
・Coating on the surface of the outer hook body, 13...Inner hook body, 14
...Film on the surface of the inner hook body, 16...Bobbin case body, 17...Film on the surface of the bobbin case body Agent Patent attorney Number of strokes Keiichi Part 2 Figure 3 N4 Figure 5

Claims (4)

[Claims] (1) A sewing machine characterized by forming an uneven surface on the surface of the hook body, and forming a film of tetrafluoroethylene, trifluorochloroethylene, or a polymer thereof on the uneven surface. Ma. (2) The sewing machine hook according to claim 1, wherein the hook is an outer hook. (3) The sewing machine hook according to claim 1, wherein the hook is an inner hook. (4) A sewing machine characterized by forming an uneven surface on the surface of the bobbin case body, and forming a film of tetrafluoroethylene, trifluorochloroethylene, or a polymer thereof on the uneven surface. bobbin case.