Sewing – Special machines – Darning
Patent
1993-07-02
1995-01-17
Crowder, Clifford D.
Sewing
Special machines
Darning
112 21, D05B 2100
Patent
active
053817435
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a device for making seams on three-dimensional objects made of materials such as textile woven materials, leather, synthetics or similar materials. Such devices are used for the production of clothing, upholstery for seating furniture and automobiles, and for the production of shoes.
Usually, three-dimensional objects such as envelopes made of fabric are manufactured in such a way that pre-made two-dimensional cuttings are sewn lying flat on top of each other with a sewing machine. The two cuttings are sewn together at an exactly specified distance from the cutting edges. Beforehand, the cuttings have been provided with markings which have to match during sewing, and it is also necessary to displace the cuttings relative to each other during sewing. Joining of the cuttings by means of a sewing machine is very time-consuming and requires a high degree of routine of the operator who has to guide the cuttings and operate the sewing machine. Because of the relatively slow manual control, the performance possibilities of the sewing machine are not fully utilized. The feeding of the materials is made by the sewing machine intermittently between the penetration movements of the needle. From DE 33 38 405 A1, a device for producing three-dimensional articles provided with seams is known wherein a sewing machine is attached to a manipulator in the form of a robot arm. This sewing machine is moved by the manipulator in such a manner that said sewing machine is guided along the intended seam line of the two cuttings to be sewn. An under-thread bobbin grips underneath the cuttings to be sewn and a presser presses against the top cutting. The lower cutting is supported by a brush bed through which the under-thread bobbin moves.
A similar sewing device is known from EP 0 344 400 A1. Here, too, a sewing machine is secured to the manipulator arm of a robot, the details of which sewing machine, however, are not described.
The known devices on which a sewing machine is moved by a manipulator in a three-dimensional system involve the difficulty of obtaining a neat and distortion-free seam and still carrying out the sewing action at high working speed.
SUMMARY OF THE INVENTION
It is the object of the invention to provide a vice for making seams on three-dimensional objects, which permits the production of perfect and distortion-free seams.
This object is solved, according to the invention; with the features indicated in claim 1.
In the sewing device according to the invention, the sewing machine comprises a sewing head the movement of which is controlled such that during the penetrations of the needle into the material, it is at a standstill relative to the holding device carrying the workpiece. These standstill actions can be produced in different ways. One possibility is to move the manipulator arm in coordination with the needle movements of the sewing machine along the seam line such that said manipulator arm is at a standstill during the penetration and withdrawal movements of the needle and only moves the sewing machine when the needle is pulled out of the material. Another possibility envisages that the sewing head is movably guided in a linear direction on the manipulator arm such that at the point when the needle is in the material, said sewing head is moved backward along the intended seam line relative to the manipulator arm at about the same speed and afterwards, when the needle is pulled out of the material, the amount of lost movement is caught up again. The manipulator arm can then be moved at constant speed such that the tool center point of the manipulator moves at constant speed along the seam line, the sewing machine, however, alternately falling short of the tool center point and catching up the lost movement again. To this end, a guide is secured to the manipulator arm which guide is always aligned parallel to the intended seam line and along which the entire sewing machine is linearly guided. Finally, it is also possible to move the holding device f
REFERENCES:
patent: 3775795 (1973-12-01), Collins et al.
patent: 4155317 (1979-05-01), Enomoto
patent: 4327653 (1982-05-01), Blessing
patent: 4423691 (1984-01-01), Schwaab
patent: 4848252 (1989-07-01), Ciucani
patent: 4905615 (1990-03-01), Pofferi
patent: 4989525 (1991-02-01), Portilla
patent: 5022335 (1991-06-01), Hanyu et al.
Crowder Clifford D.
Lewis Paul C.
Moll Automatische Naehsysteme GmbH i.g.
LandOfFree
Device for making seams on three-dimensional objects does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for making seams on three-dimensional objects, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for making seams on three-dimensional objects will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-741637