JPH0646467Y2 - Sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a sewing machine hook, and more particularly to a sewing machine hook having an oil supply port.

(Prior Art) FIGS. 3 to 5 show a conventional sewing machine hook having a filler port, 1 is a rotating outer hook, 1a is an outer hook point, 2 is an outer hook race surface, and 3 is this outer hook race. The inner hook 4 which slides on the surface 2 is for supplying the lubricating oil to the race surface 2 and is for the outer hook race surface 2
Is a hook oil supply port opened on the race wall surface 5 of the outer hook 1 connected to the above.

(Problems to be solved by the invention) However, in the conventional sewing machine hook as described above, the hook refueling port 4 is formed on the race wall surface 5 of the outer hook 1 as shown in FIG. A portion of the outer peripheral surface of a cylindrical oil passage 7 having a diameter of 1.2 mm, which extends vertically upward in the outer kettle 1 from the hook shaft 6, is provided on the race wall surface 5 with a width H smaller than the diameter of the cylindrical oil passage 7, for example 0.8. It is a rectangular opening formed by opening over mm, and since the opening width H is small, it may be blocked by a burr at the time of processing or become an extremely narrow opening.

Further, the angles α, α ′ formed between the inner peripheral surface of the cylindrical oil passage 7 and the race wall surface 5 on both side edges of the rectangular opening are the opening width H.
Is an acute angle because it is smaller than the diameter of the cylindrical oil passage 7, as shown in FIGS. 6 (a) to 6 (c), for example, a cloth dust caused by friction between the cloth feed dog and the cloth during sewing. 8
Is dropped on the outer hook race surface 2 and moves on the outer hook race surface 2 as the outer hook 1 rotates, the outer hook 1 is moved by the outer peripheral portion of the inner hook 3.
When pressed from the side edge on the upstream side of the hook refueling port 4 when viewed from the rotation direction of the hook, the cloth dust 8 accumulates in this portion, and finally there is a drawback that the hook refueling port 4 is blocked and defective hook refueling occurs. Inconveniences such as seizure and abrasion occur on the sliding parts of the hook 1 and the inner hook 3.

The present invention eliminates the above drawbacks.

(Means for Solving the Problems) In the hook of the sewing machine of the present invention, a part of the outer peripheral surface of the cylindrical oil passage extends over a width smaller than the diameter of the cylindrical oil passage on the race wall surface connected to the race surface of the outer hook. In the hook of the sewing machine in which the hook refueling port is formed by opening the hook refueling port, the upstream side edge of the hook refueling port is shifted to the upstream side when viewed from the rotation direction of the outer hook, and the race wall surface is formed at the upstream side edge. And the angle formed by the inner peripheral surface of the hook refueling port is made an obtuse angle.

(Operation) In the hook of the sewing machine of the present invention, the dust on the race surface of the outer hook moves without accumulating on the side edge of the hook oiling port.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In the present invention, as shown in FIGS. 1 and 2, the opening width of the rectangular kettle oil supply port 4 formed on the race wall surface 5 of the outer kettle 1 is a value H which is sufficiently larger than the diameter of the cylindrical oil passage 7. The side edge on the upstream side is positioned so as to be shifted to the upstream side so as to be '.

Since the hook of the sewing machine of the present invention has the above-described structure, the angle α ′ formed between the race wall surface 5 and the inner peripheral surface of the hook oil filler port 4 at the upstream side edge of the hook oil filler port 4 is shown in FIG. As shown in FIG. 5, the obtuse angle causes the cloth dust 8 not to be caught on the side edge of the hook oiling port 4, and even if the cloth dust 8 enters the hook oiling port 4, it becomes easy to get out of it.

(Effects of the Invention) As described above, according to the sewing machine hook of the present invention, clogging due to dust on the hook filler port can be easily prevented, so that the hook is burned or damaged.
There is a great advantage that inconveniences such as wear are eliminated.

[Brief description of drawings]

FIG. 1 is a perspective view of the outer hook portion of the hook of the sewing machine of the present invention, and FIG.
FIG. 4 is a plan view of a part thereof, FIG. 3 is a plan view of a hook part of a hook of a conventional sewing machine, FIG. 4 is a perspective view of an outer hook part thereof, and FIG. (A)-(c) is explanatory drawing of a kettle oil supply port, respectively. 1 ... Outer hook, 1a ... Outer hook sword tip, 2 ... Outer hook race surface, 3
…… Inner pot, 4 …… pot filling port, 5 …… race wall, 6 ……
Hook shaft, 7 ... Cylindrical oil passage, 8 ... Dust dust.

Claims (1)

[Scope of utility model registration request] 1. A kettle oil supply port is formed by opening a part of the outer peripheral surface of a cylindrical oil passage over a width smaller than the diameter of the cylindrical oil passage on a race wall surface connected to the race surface of the outer kettle. In the sewing machine hook, the upstream side edge of the hook oil supply port is shifted to the upstream side when viewed from the rotation direction of the outer hook, and the angle formed between the race wall surface and the inner surface of the hook oil supply port at the upstream side edge. A sewing machine kettle characterized by an obtuse angle.