Sewing – Special machines – Positionable work carrier
Reexamination Certificate
2000-04-13
2001-09-25
Nerbun, Peter (Department: 3741)
Sewing
Special machines
Positionable work carrier
Reexamination Certificate
active
06293214
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a sewing machine frame drive device, more particularly, to a device for freely conveying on an X-Y coordinate plane a frame, on which an article being sewn is set.
DESCRIPTION OF THE RELATED ART
Generally known as a sewing machine frame drive device of the type is a drive unit comprising two timing pulleys disposed with a predetermined spacing therebetween, a timing belt extended between the timing pulleys in an endless fashion, and a driving force transmitting member mounted on the linear running portion of the timing belt. With the drive unit, a shaft of one of the timing pulleys is rotatingly driven by a motor, whereby the timing belt is made to run alternately to move a frame, by which an article being sewn is supported, through the driving force transmitting member provided on the belt.
In the above-described drive unit of the prior art, the timing belt generates elongation when the unit is driven, and an error in movement is caused by backlash when the timing pulleys are reversed. Therefore, it is difficult to perform precise control of movement of the frame, on which an article being sewn is supported. Accordingly, in some cases, correction control of various types is needed for compensation of the above-mentioned disadvantage.
SUMMARY OF THE INVENTION
The present invention has been proposed to preferably solve the disadvantage inherent in the above-mentioned prior art, and provides as its object a sewing machine frame drive device capable of precisely conveying on an X-Y coordinate plane a frame, on which an article being sewn is set.
To overcome the above-mentioned problem and to preferably attain the intended object, a sewing machine frame drive device, according to the present invention, comprises X-direction drive units and Y-direction drive units for imparting driving forces to a frame of various types, on which an article being sewn is set, at least one of the drive units being composed of screw rods rotatingly driven by a motor in alternate directions, and moving bodies threaded on the screw rods.
Further, the frame driving unit is composed of a screw rod and a moving body threaded on the screw rod to eliminate any contracting and extending element from a driving force transmitting system and to involve less influence due to backlash, so that the frame can be precisely driven.
REFERENCES:
patent: 3830175 (1974-08-01), Levor
patent: 5003895 (1991-04-01), Talanker
patent: 5018462 (1991-05-01), Brocklehurst
patent: 5809918 (1998-09-01), Tajima et al.
patent: 5964645 (1999-10-01), Jemt
Koda & Androlia
Nerbun Peter
Tokai Kogyo Mishin Kabushiki Kaisha
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