Metal working – Upholstered article making – Method
Patent
1989-05-08
1991-10-08
Gorski, Joseph M.
Metal working
Upholstered article making
Method
29 91, 29771, 29787, B68G 700, B23P 2100
Patent
active
050541781
DESCRIPTION:
BRIEF SUMMARY
Subject of the invention is an automatic frame bending machine used for bending steel rods or band steel as well as a process and device for the production of innersprings for mattresses and upholstered furniture.
The disadvantage of the frame bending machines known so far is the possibility of material losses during adjustment attempts. Furthermore, with the frame bending machines known so far the change-over to other frame shapes was expensive, since re-alignment, particularly close to the angles, was required during the production. It was also very difficult to integrate the known frame bending machines into production lines.
The objective of this invention is to design a frame bending machine in such a way that frames of the most diverse types can be automatically produced with ease and without the danger of material losses or the danger of distortion of the frames. Furthermore, the frame bending machine should be easily integrated in a production line for the production of innersprings for mattresses and upholstered furniture.
The nature of the invention is in the special combination of the individual aggregates which are consecutively or in series connected with the micro processor controls and the hydraulic aggregate, whereby the individual aggregates are synchronized and arranged in the plane of the steel rods or band steel.
In one of the design versions of the frame bending machine the traction rollers pull the steel rods to be aligned through the rollers of the wire alignment device, whereby the rotor arranges the angles of the frame to be bent in a plane by twisting the steel rods or the band steel respectively.
Thus is achieved that the wire alignment device operates without wear and tear and, furthermore, that the frames remain flat due to the position of the wire alignment device, but particularly due to the special arrangement of the feeder and bending aggregate, so that subsequent re-alignment is no longer required.
In one advanced design of the frame bending machine the bending device consists of a pin which pivots around a fixed axis, whereby the steel rods or bands to be bent run between said axis and pin.
The pin on a swivel arm is driven by a hydraulic motor designed to obtain high accuracy throughout the entire range.
In a further design the bending device consists of a center disk and a bending roller, whereby the center disk is designed with a groove around its circumference for the steel rods or bands to be bent, and whereby the bending roller--in accordance with the angle to be bent--is led around the outer circumference of the center disk in the area of a swivel arm.
Thus, high bending accuracy in the desired angle range is achieved, whereby setting or re-setting of the angle is easily accomplished from the front, due to the mounting of the center disk or the bending roller respectively.
The design of the bending device is such that the cutting device in the area of the diverters in extension of the bending device is opposite to the moving direction of the bending device, whereby the steel rods or bands to be cut run in a counter bearing.
This results in precise guidance of the steel rods or bands in a privileged direction with cuts of millimeter accuracy.
The centering plate is located at the end of the frame bending machine, semicircular and preferably arched upwards.
This results in limiting the length of the frame bending machine, since the completely bent frame parts are caught by the centering plate and are arched upwards to the front without causing a distortion of the completed frames.
Thus it is possible to use a much smaller space for the frame production than was previously required.
With the integration of the automatic frame bending machine as per the invention into a production line, the subject invention also covers a process for the production of innersprings for mattresses or upholstered furniture, whereby an innerspring is to be equipped with a frame each, both at the upper and lower side.
Some of the processes and devices known so far require quite a bit of add
REFERENCES:
patent: 2184517 (1939-12-01), Duvall et al.
patent: 4161110 (1979-07-01), Ritter et al.
patent: 4280350 (1981-07-01), King et al.
patent: 4590779 (1986-05-01), Stang et al.
patent: 4724590 (1988-02-01), Langas et al.
patent: 4815182 (1989-03-01), Langas et al.
patent: 4829643 (1989-05-01), Ayres et al.
Gorski Joseph M.
Hughes S. Thomas
Spuhl AG
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