Buttonhole sewing machine

Details Buttonhole sewing machine Buttonhole sewing machine

2003-04-09

2003-11-18

Nerbun, Peter (Department: 3765)

Sewing

Special machines

Buttonhole

C112S073000

Reexamination Certificate

active

06647905

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a buttonhole sewing machine comprising a needle drivable via an arm shaft; an x-y table, which is movable by an x drive in an x direction and by a y drive in a y direction. which supports a first and a second work piece clamp mounted for displacement one relative to the other, and which comprises a displacement drive for displacing the work piece clamps relative to each other from an initial position of spread by a length of spread into a final position of spread.
2. Background Art
The JUKI MEB-3200 Instruction Manual leaflet no. 02 29343316 describes a buttonhole sewing machine of the generic type. It comprises an x-y table which is displaceable on the sewing plane by two stepper motors as x and y drives. Two work piece clamps arc disposed on the x-y table, holding a work piece thereon. By means of a pneumatic cylinder, they are displaceable in the x direction on the sewing plane, which is formed by the x-y plane, in mirror symmetry to a center plane. Both pneumatic cylinders are operable by means of a control command that is stored in the control unit. Provided on each side of the x-y table are setscrews, enabling the length of spread of each work piece clamp to be set from a non-modifiable inner initial position of spread to a final position of spread.
Shifting the work piece clamps enables the tightly clamped work piece to be stretched and spread into a tautened plain position. It is possible in this way to produce high quality buttonholes. Spreading the work piece also creates sufficient room for the needle, in case the buttonhole is first cut and then sewn i.e., with the sewing machine working in a so-called preconditioning mode. The displacement of each work piece clamp is in the range of 1.0 mm so that the clamps can be moved apart by a length of spread of 2.0 mm. The length of spread depends on various sewing parameters such as the structure of the work piece i.e., material, thickness and the like, the kind of threads used for sewing, thread tightening, needle size, possible use of a gimp thread and further parameters.
Drawbacks of this known machine reside in that the work piece clamps must be made rather solid if not, they would be warped by the clamping forces that occur. Considerable frictional forces occur upon spreading, which must be overcome by the displacement drive for execution of the spreading motion.
SUMMARY OF THE INVENTION
It is an object of the invention to develop a buttonhole sewing machine of the generic type for as simple a design as possible of the at least one work piece clamp.
According to the invention. this object is attained by at least the first work piece clamp comprising a supporting plate for accommodation of a work piece and a clamping plate which is mounted on the supporting plate; and by a clamping drive for actuation of the clamping plate supporting itself on the supporting plate.
The measures according to the invention help ensure that, at least by the displaceable work piece clamp, no forces are transmitted to the guides of the work piece clamp on the x-y table. No frictional forces that might oppose the displacement of the work piece clamp for spreading are occasioned in positioning the work piece clamp. The forces that occasion when a work piece is clamped are kept within the work piece clamp itself. This works in favor of the rapidity and accuracy of the spreading job. Lightweight construction of the entire spreading arrangement is possible, reducing material consumption.


REFERENCES:
patent: 6095066 (2000-08-01), Nöltge et al.
patent: 6105519 (2000-08-01), Kastrup
patent: 6205939 (2001-03-01), Janocha et al.
patent: 299 12 970 (1999-10-01), None
JUKI Corporation, 2000-2001, JUKI MEB-3200, Instruction Manual Leaflet No. 0229343316.

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