Sewing – Special machines – Buttonhole
Reexamination Certificate
2000-02-29
2001-05-15
Nerbun, Peter (Department: 3741)
Sewing
Special machines
Buttonhole
C112S129000, C112S470050
Reexamination Certificate
active
06230637
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a sewing installation for the production of a piped pocket opening on a cloth workpiece.
2. Background Art
U.S. Pat. No. 3,747,545 teaches a sewing apparatus for the formation of a piped pocket opening on a cloth workpiece which comprises a working plate, a two-needle sewing machine disposed on the working plate, and a workpiece advancing device for the transport of the workpiece in a Y-direction on the working plate. Furthermore, a knife is available for the production of a straight incision in the Y-direction in the workpiece during transport in the Y-direction. A cutout, which extends in the Y-direction, is formed in the working plate. Underneath the working plate, provision is made for a cutting device for the production of corner cuts, the cutting device comprising two corner cutting knives. Each corner cutting knife consists of two blades. For the production of so-called diagonal corner cuts which are necessary in diagonal pocket openings, the corner cutting knives are of pivotal design. This kind of adjustment of the corner cutting knives permits only a comparatively restricted influence on the feasible corner cuts; therefore, this type of knife adjustment has not been successful in practice. Moreover the structure is very complicated. Any adjustment of the corner cutting knives can be triggered only in constructionally defined stages. The known cutting device is accompanied with considerable requirements in terms of assembly, adjustment and fabrication.
U.S. Pat. No. 3,820,481 teaches a sewing apparatus for the production of a piped pocket opening on a cloth workpiece, the pocket opening being alternatively straight or diagonal. It comprises a cutting device with corner cutting knives which consist of two individual knives. Variability of the angles of the corner cuts at the respective end of the pocket opening is attained in that on the one hand the corner cutting knives are rotatable in defined given stages and in that moreover the two knives of a corner cutting knife penetrate into the workpiece by varying depths. The known design is constructionally complicated and correspondingly costly. Assembly and adjustment are also accompanied with considerable time expenditure. Moreover, the angles of the corner cuts can only be triggered in given stages. Since these knives penetrate into the workpiece by varying depths, the cutting lengths in the corner cut depend on the material.
U.S. Pat. No. 5,400,731 teaches a sewing system for the production of a piped pocket opening on a cloth workpiece, which fundamentally corresponds to that according to U.S. Pat. No. 3,820,481 described above. In this case, however, rotation of the knives takes place by means of stepping motors that can be triggered continuously, and the cutting motion of the knives is effected by pneumatically actuated piston-cylinder drives. The drawbacks are fundamentally the same as described above.
A sewing apparatus is known from DE 42 24 034 A1, having a cutting device for the production of corner cuts. The corner cutting knives are drivable by means of electric motors, each knife of a corner cutting knife being adjustable to varying cutting strokes and angles for corner cuts of varying angles and cutting lengths to be carried out. Correspondingly, each corner cutting knife is provided with four motors so that the cutting device, which comprises two corner cutting knives, has a complicated design. In this case, too, there is the drawback that the cutting lengths in the corner cut depend on the material due to the varying depths of penetration of the knives.
SUMMARY OF THE INVENTION
It is an object of the invention to embody a sewing installation for the production of a piped pocket opening on a workpiece, in which adjustment of the corner cutting knives is feasible at a low construction cost and in which steady quality of the corner cuts is ensured.
This object is attained in a sewing installation for the production of a piped pocket opening on a workpiece, comprising a working plate; a two-needle sewing machine disposed on the working plate; a workpiece advancing device for the transport of the workpiece in a Y-direction on the working plate; a knife for the production of a straight incision running in the Y-direction in the workpiece during the transport thereof in the Y-direction; a cutout running in the Y-direction in the working plate; a cutting device for the production of corner cuts in the workpiece, which cutting device is disposed underneath the cutout of the working plate, comprises a first and a second cutting unit, which are adjustable relative to each other in the Y-direction, and a drive for the adjustment relative to each other of the first and the second cutting unit; a first corner cutting knife, which is disposed on the first cutting unit, and a second corner cutting knife, which is disposed on the second cutting unit, each of the first and second corner cutting knives comprising a first knife, a second knife, and a cutting point, at least one knife being adjustable in a pivot guide to pivot about an axis which intersects the cutting point and runs in an X-direction; at least one drive disposed on the first and the second cutting unit for the displacement of the corner cutting knives by a uniform stroke in a Z-direction through the cutout in the working plate and through the workpiece resting thereon; at least one drive disposed on each cutting unit for the pivotal adjustment of at least one knife relative to the cutting unit; and a control unit for the triggering of the drives. The pivotal adjustment of one or preferably of both knives of a corner cutting knife only serves to change the position of the cutting edges. The tips of the cutting edges remain in a common point which can be formed by a cutting point for instance of an awl or by the tips of the knives themselves. These adjustments serve to modify the length of the cuts to be performed at a constant cutting stroke and the angular position of the cuts relative to each other. Owing to the uniform depth of incision of the knives, simple actuation, for instance by pneumatically actuated piston-cylinder drives, is possible at a constant stroke. The design is simple, which keeps the number of components low.
REFERENCES:
patent: 6047654 (2000-04-01), Kaufhold
patent: 6095072 (2000-08-01), Kaufhold
patent: 42 24 034 A1 (1993-01-01), None
Rausch Bernd
Seufert Klaus
Wengerter Karl-Heinz
Beisler GmbH
Conte Robert F. I.
Lee Mann Smith McWilliams Sweeney & Ohlson
Nerbun Peter
LandOfFree
Sewing installation for the production of a piped pocket... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Sewing installation for the production of a piped pocket..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sewing installation for the production of a piped pocket... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2436293