Apparatus for feeding material to be stitched in a sewing...

Sewing – Special machines – Positionable work carrier

Reexamination Certificate

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Reexamination Certificate

active

06295941

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to an apparatus for feeding a material to be stitched to desired positions on a sewing machine table so as to apply to it stitches such as embroidery.
DESCRIPTION OF THE RELATED ART
Taking an embroidering machine, for example, there is known one which contains, as an apparatus for feeding a material to be stitched to desired positions within an X-Y rectangular coordinate plane of a machine table, an X-direction drive mechanism and a Y-direction drive mechanism disposed under the table and a rectangular frame body for holding the material to be stitched on the table. This frame body is connected to the X-direction drive mechanism and to the Y-direction drive mechanism so that the frame body is driven in the X direction and Y direction.
While the frame body holding the material to be stitched is driven in the X direction and Y direction as described above, it is not adapted to be guided securely by an X-direction guide member and a Y-direction guide member on the table, so that the frame body is likely to undergo strain when it is driven, unless it has substantial rigidity. Once the frame body is strained, the frame body and the material to be stitched held by it as a whole cannot be fed accurately, and stitched patterns are also strained depending on the location of machine heads in the embroidering machine, inconveniently.
Under such circumstances, a constitution for solving such inconvenience is proposed as disclosed, for example, in Japanese Unexamined Patent Publication (KOKAI) No. Hei 5-163660. According to this proposition, an X-direction guide member which is longer than the X-direction length of the frame body is disposed on the machine table and is connected directly to a Y-direction drive mechanism located under the table, and likewise a Y-direction guide member which is longer than the Y-direction length of the frame body is disposed on the machine table and is connected directly to an X-direction drive mechanism located under the table. The frame body according to this constitution is connected to the X-direction guide member and to the Y-direction guide member to be movable relative to them in the X direction and in the Y direction, respectively. Therefore, according to this constitution, the frame body is driven in the X direction and Y direction as desired under constant guiding by the X-direction guide member and Y-direction guide member, so that this constitution enjoys an advantage of preventing strain from occurring in the frame body.
However, in the above constitution, the X-direction guide member and the Y-direction guide member themselves can strain depending on the position of the frame body due to the arrangement relationship of the X-direction drive mechanism and the Y-direction drive mechanism located under the table. In such cases, the entire frame body is caused to be tilted even if the frame body itself is not strained, so that the material to be stitched held by the frame body cannot eventually be fed accurately in the X direction and Y direction, disadvantageously.
SUMMARY OF THE INVENTION
The present invention was accomplished in view of the problems involved in the prior art described above and is directed to providing an apparatus for feeding a material to be stitched in a sewing machine, which can feed the material accurately.
In order to overcome the problems described above and attain the intended objective, the present invention provides an apparatus for feeding a material to be stitched to desired positions within an X-Y rectangular coordinate plane on a sewing machine table. The apparatus contains a plurality of Y-direction drive mechanisms arranged parallelwise at predetermined intervals; a plurality of X-direction drive mechanisms also arranged parallelwise at predetermined intervals; a Y-direction driven body connected to the Y-direction drive mechanisms to be driven on the machine table in the Y direction only; an X-direction driven body connected to the X-direction drive mechanisms to be driven on the machine table in the X direction only; and a frame body for releasably holding the material to be stitched, which is connected to be movable in the X direction relative to the Y-direction driven body and in the Y direction relative to the X-direction driven body; wherein the plurality of X-direction drive mechanisms are designed to be disposed between a Y-direction drive mechanism located at an outermost position among the plurality of Y-direction drive mechanisms and that located adjacent to it.
Here “the X direction and the Y direction” may be taken either depthwise and crosswise respectively or vice versa with respect to the machine table.


REFERENCES:
patent: 4406234 (1983-09-01), Johnson et al.
patent: 5003895 (1991-04-01), Talanker
patent: 5553565 (1996-09-01), Ono et al.

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