Sewing – Special machines – Darning
Patent
1992-08-24
1994-05-24
Nerbun, Peter
Sewing
Special machines
Darning
901 15, D05B 2100
Patent
active
053138970
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a machine for automating sewing operations.
BACKGROUND OF THE INVENTION
Sewing operations have evolved from a method wherein a sewing machine is fixed and a sheet of cloth is moved on a flat surface so that it is continuously brought into contact with a reciprocating needle, and there has been developed a sewing machine for industrial use which is moved on a sheet of cloth fixed on a flat surface. However, this type of sewing machine has failed to sufficiently perform a variety of sewing operations required for clothes having puffs and the like. In order to solve this, a sewing operation robot has been developed wherein a sheet of cloth is temporarily fixed on a model simulating a human body: a sewing machine is mounted on an industrial robot capable of arbitrarily positioning in a three-dimensional space and causing the needle thereof to assume arbitrary attitudes: and sewing is carried out by moving the sewing machine freely around the model and the like.
Sewing operations include an inching operation wherein seam pitches are repeatedly operated and stopped at very short intervals (during which the needle is moved up and down). However, conventional general-purpose robots have been subjected to vibrations due to insufficient rigidity and have been unusable in some cases.
There is another problem in that sliding friction occurs between the needle and cloth resulting in breakage of the needle due to the increase in the temperature of the needle.
There is still another problem in that the configurations of the mechanical components are enlarged in order to improve the mechanical rigidity of the robot, for which the weight of the robot and the capacity of the motor driving it must be thus increased and, as a result, the configuration is enlarged and the weight of the entire robot is increased.
DISCLOSURE OF THE INVENTION
The present invention is a sewing operation robot wherein a sewing machine for performing sewing operations is fixed on a wrist portion, arbitrarily positioned in a three-dimensional space, and freely attitude-controlled, characterized in that a simple harmonic motion device for putting said sewing machine in a simple harmonic motion is provided between the wrist portion and sewing machine of said sewing operation robot.
Said sewing operation robot is operated at a velocity V.sub.R =P/T when the circular frequency .omega. of said simple harmonic motion device coincides with the circular frequency of the vertical motion of a needle provided on said sewing machine; the seam pitch of said sewing machine is represented by P; the half amplitude A of said simple harmonic motion device equals P/2.pi.; and the cycle of the simple harmonic motion of said simple harmonic motion device is represented by T.
Further, said simple harmonic motion device is equipped with a counter weight whose weight is equal to that of said sewing machine, and which makes a simple harmonic motion in the direction opposite to the direction in which said sewing machine vibrates.
The sewing operation robot is operated at the constant velocity V.sub.R (=P/T). In the direction in which the robot moves, the simple harmonic motion device having the half amplitude A (=P/2.pi.) and the circular frequency coinciding with the vertical motion of the needle is provided between the sewing machine and the sewing robot. Thus, the needle portion makes an inching operation.
When the sewing machine makes an inching operation, the counter weight balances with vibrational energy, preventing vibration from occurring.
The present invention provides the following advantages.
(1) Instead of using a robot having extremely high rigidity, a simple harmonic motion device having a simple structure added to an existing robot allows an inching operation which does not cause sliding friction between the sewing machine and the cloth. This results in a reduction in both cost and failure.
(2) Since the inching operation is performed only by the sewing machine along with a part of the simple harmo
REFERENCES:
patent: 4957054 (1990-09-01), Sakuma et al.
patent: 5065684 (1991-11-01), Hansberry
Katamine Kuniaki
Kimura Kaoru
Kabushiki Kaisha Yaskawa Denki
Nerbun Peter
LandOfFree
Sewing operation robot 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 operation robot, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sewing operation robot will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1966052