Sewing – Special machines – Darning
Patent
1988-02-12
1989-09-12
Hunter, H. Hampton
Sewing
Special machines
Darning
112220, 11212112, D05B 300
Patent
active
048649473
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a nonstandard sewing machine for industrial use, which is suitable for sewing clothes, bedclothes and the like, and, in particular, for thick bed quilts or futon comforters.
BACKGROUND ART
The applicant of this invention previously developed a nonstandard sewing machine for sewing thick quilts, which is disclosed in Japanese Patent Publication No. sho 56-8638. This sewing machine includes, a machine frame provided with upper and lower horizontal guide rails, an arm unit with a needle bar and a bed unit with a rotating hook. The arm and bed units confront each other and are connected respectively to the upper and lower guide rails for movement along the respective upper and lower guide rails. This sewing machine has an advantage in that it requires only about a quarter to a half of the floor space that is required by a conventional sewing machine including a horizontally movable quilt-supporting bed and an stable machine body with an arm and bed unit.
However, in the above-described sewing machine, since the distance between the arm unit and the bed unit is not adjustable, there arises a problem that it is not easy to efficiently perform the setting and withdrawing of a quilt into and from the proper position between the arm and bed units.
Accordingly, it is an object of the present invention to provide a sewing machine which can be installed in a rather narrow floor space.
Another object of the present invention is to provide a sewing machine in which the setting and the withdrawing of an article to be sewn are easily performed upon the beginning and the ending of the sewing operation.
DISCLOSURE OF THE INVENTION
With the aforementioned objects in view, the present invention provides a sewing machine comprising: a machine frame; upper and lower support bases connected to the machine frame; upper and lower rotary members connected respectively to the upper and lower support bases for rotational movement about vertical axes; a machine body including an arm unit and a separate bed unit, the arm unit being connected to the upper rotary member, the bed unit confronting the arm unit and being secured to the lower rotary member; mounting means interconnecting the arm unit with the upper rotary member for upward and downward movement of the arm unit with respect to the upper rotary member; and vertical drive means for driving the arm unit upward and downward. The machine frame has upper and lower spaced parallel X-axis guide members extending horizontally. The upper and lower support bases are connected respectively to the upper and lower X-axis guide members for movement along the respective upper and lower guide members. The upper and lower support bases are adapted to be driven synchronously with each other along the respective upper and lower X-axis guide members by support bases drive means. The upper and lower rotary members are adapted to be turned synchronously with each other by turning means. The arm unit has a needle bar, while the bed unit has a rotating hook. The needle bar of the arm unit and the rotating hook of the bed unit are adapted to be operated synchronously with each other by machine body drive means. The sewing machine with the aforementioned construction does not occupy a inconveniently wide floor space, and enhances efficiency of the setting and withdrawing of quilts since, due to the movable arm unit, the distance between the arm unit and the bed unit is adjustable.
It is preferred that the upper rotary member is of a vertical tubular construction with a flange portion formed therearound. It is also preferred that the mounting means comprises a support rod having upper and lower end portions, the upper end portion slidably passing through the flange portion of the upper rotary member for upward and downward movement, the lower end portion being fixed to the arm unit.
The vertical drive means may be a cylinder actuator interposed between the upper rotary member and the arm unit.
The machine body drive means may include: a transmitting shaft
REFERENCES:
patent: 3515080 (1970-06-01), Ramsey
patent: 3765349 (1973-10-01), Gerber
patent: 4512269 (1985-04-01), Bowditch
patent: 4557206 (1985-12-01), Iwase
patent: 4674421 (1987-06-01), Iwase
Hunter H. Hampton
Iwase Prince Kabushiki Kaisha
Prince Mishin Kabushiki Kaisha
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