Metal working – Venetian blind assembling
Patent
1995-06-28
1998-02-24
Bryant, David P.
Metal working
Venetian blind assembling
B23P 1904
Patent
active
057200874
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention concerns a procedure for production of slat packages for Venetian blinds whose slats, placed over each other, are introduced between a first and a second transverse band in double rungs in carrying bands or ladders consisting of bands or cords, by which procedure the slats are conveyed one by one to the carrying band and lifted after being introduced into a double rung of the carrying band or ladder.
1. Background of the Invention
It is possible in order to ensure that the slats of a Venetian blind cannot turn round in the carrying bands to use carrying bands with two transverse bands in each rung, between which the slats are introduced. In principle, the introduction can take place in two ways, either by each slat being introduced directly between the two bands in each rung or by each slat being introduced after the two bands have been crossed in such a way that the lower band lies over the slat and the upper band lies under the slat.
2. Description of the Prior Art
From DE patent paper 2,003,304 a procedure is known where a carrying band with double ladder rungs is stretched between two rotary discs having recesses placed in the periphery. The distance between two successive pairs of recesses corresponds to the distance between two successive double rungs of the carrying ladder. Before a slat is introduced between the two bands of a rung, the bands are separated by means of special spreading devices, which are then placed in the conveying path of the slat. After the slat has been introduced, the spreading devices must be moved away from this conveying path. The known procedure thus requires a comparatively complicated equipment. Besides, it is not possible by the known procedure to introduce a slat into a rung whose transverse bands are twisted.
SUMMARY OF THE INVENTION
The purpose of the invention is to present a procedure which makes introduction of the slats by means of a simple and safe equipment possible. Furthermore, it must be possible to introduce the slats between twisted transverse bands.
This is achieved according to the invention in such a way that a double rung of ladder is stretched between two teeth projecting over the plane in which the slats are conveyed, that a slat is conveyed until it has passed under the first of the two transverse bands, and that the slat is then lifted so that when further conveyed it passes over the second of the two transverse bands.
The presented procedure can immediately be mechanized by means of an appropriate mechanism which moves and stretches the carrying band.
It is desirable that the slat, after being conveyed until it has passed under the first of the two transverse bands, is lifted by means of an inclined plane placed between the teeth. Hereby correct lifting of the slat is ensured in a very simple way.
It should be noted that the double rung can be stretched between the two teeth with the end of the carrying band that is uppermost in the finished slat package turning either towards or away from the conveyed slat. In the first case the slat will be introduced immediately between the two transverse bands. In the second case the slat will be introduced between twisted transverse bands.
As previously mentioned, the invention also concerns a mechanism for use in the exercise of the procedure and comprising protruding teeth between which a double rung of ladder can be stretched. According to the invention this mechanism comprises a rotary roller with pairs of teeth placed on the periphery, and where the distance between two successive pairs of teeth corresponds to the distance between two successive double rungs of a carrying ladder. The roller is turned a tooth every time an introduced slat is lifted free of the mechanism, so that the succeeding double rung is in the right place for the introduction of the succeeding slat.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following the invention will be explained in more detail in connection with the drawing, where
FIG. 1 is a schematic presentation of a carrying b
REFERENCES:
patent: 3292232 (1966-12-01), Millsson
patent: 3710464 (1973-01-01), Persson
patent: 5099556 (1992-03-01), Lim
patent: 5179771 (1993-01-01), Hebsgaard
patent: 5349730 (1994-09-01), Anderson et al.
A/S Chr. Fabers Fabriker
Bryant David P.
Stewart Tisa
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