Sewing – Elements – Frames
Patent
1992-10-28
1994-11-29
Crowder, Clifford D.
Sewing
Elements
Frames
112 21, 112304, 112309, D05B 1100, D05B 2700
Patent
active
053679687
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the invention
The present invention relates to a process and apparatus for sewing upholstered furnitures and more particularly, the invention is a system for sewing workpieces such as mattresses or the like, which contains notable advantages and innovations over the sewing systems actually used in the market.
2. Description of the Prior Art
Presently there are known several electromechanical devices and processes used for accomplishing semi-automatic sewing of upholstered furnitures. Unfortunately, each of these prior art systems are excessively complex, suffer frequent breakdown and result in high costs. Additionally, using the prior art systems, the corners of the mattresses or the like cannot be satisfactorily sewn. Unsatisfactorily sewing the corners, reduces the quality of the sewing and considerably increases the time of work and the consequential expenses.
SUMMARY OF THE INVENTION
For the purpose of avoiding the disadvantages associated with the prior art, the process and apparatus for sewing upholstered furniture that is the subject of the present invention was created. The invention, being of simple constitution and easy working, reduces costs and satisfactorily solves the technical defects of the prior art sewing devices. Specifically, the present invention teaches adequate means for sewing the corners of mattresses or the like with a continuity with respect to the rest of the same, thus obtaining a perfect quality of the sewing finish of the mattresses in addition to notably reduced work time.
The proposed method and apparatus (machine) for sewing upholstered furniture involves a set of components including a movable support, a sewing machine, a rotating arm and suitable fastening means to attach the mattress to the movable support. All this is suitably arranged in order to sew the mattress through electromechanical means. As a novelty, only one motor equipped with a speed regulator is provided. This motor moves the above-mentioned components by means of a transmission system, so that it is possible to sew the rounded edges of a mattress or similar continuously with the rest of the edges of the mattress.
The described machine only sews when the operator actuates a pushbutton, preferably a pedal provided for this purpose. This machine is equipped for sewing at two speeds; the faster speed is used for rectilinear sewing and the slower speed, which automatically starts up, is used at the end of a rectilinear seam, specifically, the slower speed is activated before coming to the curve. In particular, the slower speed is used for sewing the curved seams of the mattress.
Additionally, the machine is equipped with photoelectric cells; one of them is provided approximately 150 mm from the end of the rectilinear seam and provides a signal which causes the slow sewing speed to begin. The other cell is located some 75 mm from the end of the rectilinear mattress seam, signaling the mattress to turn and to be sewn at the slow speed along the curved seam.
BRIEF DESCRIPTION OF THE DRAWINGS
The following detailed description of the invention refers to the attached figures in which the execution deemed suitable and in accordance with the preceding comment has been shown by way of example and thus a purely unrestrictive nature, since in practice some slight modifications may be advisable that do not alter the essence of the invention.
In the drawings:
FIGS. 1 and 2 are elevated and cross-sections, respectively, of the machine.
FIGS. 3 and 4 represent partial plan views of the machine in which different phases of the sewing operation are shown.
DETAILED DESCRIPTION
Referring to the attached figures, their execution shows a machine for sewing upholstered furniture such as mattresses 1. This machine works only when the operator actuates a pushbutton, preferably pedal type, that starts up the reducer motor with speed regulator 2. The reducer motor moves, via the transmission 3 and the shaft 4, the sewing head transmission 5.
Simultaneously, the motor 2 moves the shaft
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Brosemer Jeffrey J.
Crowder Clifford D.
Fabricas Lucia Antonio Betere, S.A.
Lewis Paul C.
Michaelson Peter L.
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