Metal working – Upholstered article making – Method
Patent
1997-01-06
2000-04-18
Gorski, Joseph M.
Metal working
Upholstered article making
Method
29430, 29451, 29782, 29783, 29787, 29795, 29819, 29822, 53114, 53436, B65B 5107, B65B 124, B65G 700
Patent
active
060499591
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention concerns a method and a machine for making a spring-mattress web. The invention further relates to a mattress web made using the machine of the invention, in accordance with the method of the invention.
WO 91/05732 teaches a method and a machine for encapsulating elongated springs between two fabric webs, thereby to produce a mattress web.
One drawback of this prior art technique is that, when the shuttle by means of which a spring is introduced between the fabric webs is retracted, there is a considerable risk that the friction between the shuttle and the spring as well as between the webs and the spring will stretch the spring in its longitudinal direction, such that the spring will, when trying to revert to a non-tensioned state, contract or crease the webs. As a result, the webs have to be stretched in the transverse direction in the mattress web or in the mattress blank separated from the mattress web, which is a costly operation.
SUMMARY OF THE INVENTION
The object of this invention is to provide a method and a machine which do not suffer from this drawback.
A mattress web made in the inventive machine in accordance with the inventive method is encompassed by the protective scope of the appended claims directed to a mattress web. A mattress cut off from such a mattress web constructed in accordance with the principles of the present invention is, owing to the fact that its bottom fabric and top fabric are connected to one another on the one side of the web, more flexible and, hence, more comfortable than a mattress made from the mattress web according to WO 91/05732, whose spring-accommodating sleeves are attached to one another at the middle.
Thus, the basic concept of the present invention is that the spring is to be introduced, in non-tensioned state and in its longitudinal direction, into a curve or pocket formed in a fabric web and that the curve with the spring therein is to be closed by means of the other fabric web, such that the spring is slightly compressed, as it should be in the mattress web, but however is non-tensioned in its longitudinal direction, resulting in the elimination of the fabric-creasing forces arising in the prior art technique.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail with regard to an embodiment of a machine for implementing the method of the invention. In the accompanying drawings,
FIG. 1 is a partly sectional and partly schematic side view of the machine, and
FIG. 2 is a view of a spring-holder device.
Thus, the illustrated machine comprises an endless conveyor belt 1, which is made up of chains 2 and T-sections 3 which with their crossbars are connected to the chains in the transverse direction of the conveyor belt, such that the stems 4 of the T-sections point upwards in the upper run of the belt. The chains are driven by chain wheels (not shown) and a motor in unison fashion with an indexed movement, the step length corresponding to the width of grooves 5 of equal width formed between two successive T-sections 3.
DETAILED DESCRIPTION
During its indexed movement, the conveyor belt 1 travels in the direction indicated by the arrow A past stations I-V, the mutual distance of which is an indexation step.
The conveyor belt 1 conveys a bottom fabric L and springs 6 from station I to station V. After station V, the conveyor belt conveys a finished mattress web 7, in which parallel sleeves 8 arranged in the transverse direction of the belt each contains a spring 6, which is slightly compressed in the vertical direction. These sleeves are formed of the bottom web L and a top web U, which are attached to one another in the transverse direction of the conveyor belt. Lengths of the mattress web can be cut off between the sleeves 8 in order to produce mattress blanks, the ends of the sleeves being sealed in some suitable manner to form a finished mattress.
There follows a description of the passage of a groove, a curve and a spring from station I to station V.
The bottom web L is con
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Dux Design AB
Gorski Joseph M.
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