Buttonhole sewing machine

Details Buttonhole sewing machine Buttonhole sewing machine

2000-04-05

2001-04-24

Nerbun, Peter (Department: 3741)

Sewing

Special machines

Buttonhole

C112S447000, C112S470040

Reexamination Certificate

active

06220192

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a buttonhole sewing machine for the production of a group of buttonholes on a workpiece, the group having at least two buttonholes of varying design and/or size, the buttonhole sewing machine comprising a needle, which is mounted in an arm, and which is drivable to reciprocate in a Z direction by means of a driving motor, and which is drivable by a jogging drive for the production of a zigzag seam by a motion of the needle relative to the workpiece, and which is drivable to pivot about an axis by means of a pivot drive; a hook bearing, which is disposed in a base plate, and which is drivable by a pivot drive to pivot synchronously and equiangularly of the needle about a pivot axis which extends in the Z direction; a hook, which is disposed in the hook bearing; a stitch hole, which is allocated to the needle and the hook; a holder for the workpiece, which holder is displaceable by drives in an X direction and a Y direction; and an operating and control unit.
2. Background Art
In a buttonhole sewing machine of the generic type known from U.S. Ser. No. 09/063,965, U.S. Pat. No. 6,006,685 the workpiece holder in the form of an X-Y table is actuated by two stepper motors. Furthermore, the needle bar and the hook bearing are driven synchronously and equiangularly by a stepper motor so that the sewing tools are rotatable about the axis of the needle, which helps attain a constant position of the sewing tools relative to the direction of sewing and thus considerable flexibility of the machine as regards the geometry of the seam.
SUMMARY OF THE INVENTION
It is an object of the invention to embody the buttonhole sewing machine of the generic type such that a group of buttonholes of varying design and/or dimensions can be sewn by it successively, there being no need of manual adjustment of the machine.
According to the invention, this object is attained by devices for the entry, storage and processing of information about the varying design and/or size of the group of buttonholes; and by a device for triggering the drives for the successive production of the buttonholes on the workpiece. The measures according to the invention help attain that all the relevant parameters of buttonholes that are to be produced successively at a single work place, i.e. by one and the same buttonhole sewing machine, are entered in advance and that the buttonholes are then sewn one after the other. The buttonholes can be cut if a cutter is provided for the production of an incision in the zigzag seam; if the operating and control unit comprises means for the entry, storage and processing of information about the execution and non-execution and the type of the incision; and if the device for triggering the drives also comprises means for triggering the cutter. In this case it is of no importance whether cutting the buttonholes takes place in the pre- or after-cutting mode.
Provision is made for a gimp thread feeder, which is very often desired, automatic feeding and cutting of the gimp thread being provided within the scope of automation of the sewing operation of the varying buttonholes. Of course, this design of the gimp thread feeder can also be employed when buttonholes are sewn successively which are identical in design and size and/or when no automation is provided.
Details of the invention will become apparent from the ensuing description of an exemplary embodiment, taken in conjunction with the drawing.


REFERENCES:
patent: 1991627 (1935-02-01), Reece
patent: 4501207 (1985-02-01), Miyazaki et al.
patent: 4953486 (1990-09-01), Sano et al.
patent: 6006685 (1999-12-01), Kastrup et al.
patent: 1 208 167 (1965-12-01), None
patent: 33 02 385 A1 (1983-08-01), None
patent: 35 90 091 T1 (1985-09-01), None

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