Illumination – Machinery lighting – Sewing
Patent
1990-12-19
1992-05-12
Lazarus, Ira S.
Illumination
Machinery lighting
Sewing
362 32, 362 33, 362368, D05B 7900
Patent
active
051133245
DESCRIPTION:
BRIEF SUMMARY
The innovation pertains to a sewing machine according to the introductory part of claim 1.
Such a sewing machine is known from [West] German Utility Patent Specification No. 87,03,621. The lamp has a light source, whose beams are transmitted via fiber-optic light guides. These project from the housing in close proximity of the needle bar on the lower side of the head and illuminate the needle plate.
The fiber-optic light guides considerably reduce the free space under the head, and it cannot be ruled out that the sewing machine operator may move the fiber-optic light guides while guiding a fabric to be sewn, so that they may have to be readjusted.
The basic task of the innovation described in claim 1 is to design the lamp and arrange it on the sewing machine such that any part of the machine can be illuminated without the lamp adversely affecting the work area and the field of view of the sewing machine operator.
This task is accomplished in the device according to the present innovation by the characterizing part of claim 1.
Since the housing part is also intended to receive the lamp, besides its actual purpose, an additional holder, which not only often affects the appearance of the sewing machine disadvantageously, but is also often seen as a nuisance due to reaching into the sewing machine operator's work area, is eliminated.
The covered arrangement of the fiber-optic light guide, as well as the shape of its end piece adapted to the housing part, cause the sewing machine operator to be protected from scattered light and the lamp, as an integral part of the sewing machine, to perform its function without blocking the sewing machine operator's view.
Due to the end piece being able to be adjusted according to claim 2, the position and the sharpness of a light spot imaged on the machine part to be illuminated are adjustable, the position of the light spot can be changed by pivoting the end piece, and the light spot can be focused on the machine part by movements with a vertical component.
The housing part according to claim 3 is particularly suitable for receiving the end piece, because the protective bracket is guided along the head at a distance predetermined by the path of movement of the thread lever. The protective bracket receiving the end piece should be directed at its lower end toward the needle, so that the end of the end piece corresponding to the shape of the protective bracket is inherently oriented toward the needle plate. The swiveling mounting of the end piece now serves only for fine adjustment.
Claim 4 discloses a design measure for adjusting the end piece.
The innovation will be explained on the basis of an embodiment shown in the drawing.
Here,
FIG. 1 shows a schematic diagram of a sewing machine with a lamp,
FIG. 2 shows a section of the lamp along line II--II in FIG. 1,
FIG. 3 shows, partially cut away, the front side of the sewing machine along line III--III in FIG. 1,
FIG. 4 shows a section along line IV--IV according to FIG. 1, and
FIG. 5 shows an enlarged detail indicated by dash-dotted lines in FIG. 3.
FIG. 1 shows a sewing machine whose housing (1) is formed by a base plate (2) with a needle plate (3), a stand (4), an arm (5), and a head (6). A protective bracket attaching part (7), which covers a thread lever (8) driven in the usual manner, is fastened by a holder (9) on the top side of said head (6). A needle bar (10), which carries the needle (11), and a presser foot device (12) are also mounted in said head (6) in a manner not shown.
Said housing (1) receives a lamp (13), which has a light source (14) (FIG. 2). Said light source (14) is followed by lenses (16) represented in an abstract form, which are arranged in a cylindrical housing (15). On the other side of said lenses (16), a fiber-optic light guide (17) is introduced into said cylindrical housing (15).
Said fiber-optic light guide (17) extends from said cylindrical housing (15) to the sewing machine (FIG. 1), enters said housing (1) on the rear side [of the sewing machine], is led along said arm (5) and said head (6),
REFERENCES:
patent: 2226689 (1940-12-01), Barber
patent: 4322781 (1982-03-01), Peterson
patent: 4382273 (1983-05-01), Jones
patent: 4841415 (1989-06-01), Dobner
Hagaman Sue
Lazarus Ira S.
Pfaff Industriemaschinen GmbH
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