Manufacturing container or tube from paper; or other manufacturi – Control means energized in response to activator stimulated... – Responsive to work material – the product or means engaging...
Patent
1995-01-17
1997-04-01
Hail, III, Joseph J.
Manufacturing container or tube from paper; or other manufacturi
Control means energized in response to activator stimulated...
Responsive to work material, the product or means engaging...
493 8, 493 12, 493 22, 493 27, 493 29, 493409, 493411, 493412, 493413, 493414, 493415, 270 3905, B31B 152
Patent
active
056161131
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Field of the Invention
The invention concerns a machine for folding a web in a zigzag manner, whereby said machine contains a transport mechanism for the web, a receiving device at the bottom for collecting the folded web, a folding mechanism erected between the transport mechanism and the receiving device and a detection means to detect improper folds.
Related Art
Such machines, which may contain a cutting device or perforating device, are usually coupled to a printing machine. The web may be whether or not prefolded or, in other words, the web which is supplied to the printing machine may come from a zigzag folded stack as well as from a roll.
The printing machine/folding machine unit requires supervision and thus cannot work overnight or during weekends, when no personnel are present. From time to time, a fold is not formed correctly. Such an improper fold is detected by the detection means which then emits a signal or stops the unit. Consequently, the unit is frequently inoperative for quite some time during unattended periods, which reduces its performance and upsets the production scheme or planning.
BRIEF SUMMARY OF THE INVENTION
The invention aims to remedy this disadvantage by providing a machine for folding a web in a zigzag manner which contains a detection means for the detection of improper folds and with which improper folds in the web folded on a stack can be avoided, but with which the standstill of the machine as a result of a detected improper fold lasts significantly shorter than with the known machines.
To this aim, the folding machine contains means to move the web backward in the folding mechanism and a control device which is connected to these means and the detection means, so that, at least with a first detection of an improper fold, the web is moved backward in the folding mechanism by said means over such a distance that the improper fold is entirely unfolded and so as to afterwards allow again for the normal forward movement of the web through the folding mechanism.
When an improper fold is detected, there is an intervention, but the machine is not stopped permanently. The improper fold is unfolded and at least one new attempt for folding is made. In most cases, the folding is done normally and the machine just continues working until the next improper fold or until the folding job is completed.
The folding mechanism may contain a suspended web guide which hinges to and fro in the usual manner, means to hinge this guide to and fro and smoothing means for smoothing the folds of the web put down in a zigzag manner by the guide.
According to a special embodiment of the invention, the means for moving the wed backward are means to reverse the driving direction of the transport mechanism and the control device contains means to, as an improper fold is detected, order said means for reversing the driving direction to temporarily reverse the driving direction of the transport mechanism such that this transport mechanism itself moves the web backward.
The transport mechanism may hereby either contain pin tractors or a driven roller working in conjunction with a counter roller
According to another special embodiment of the invention, the means for moving the web backward consist of separate driving means which can be switched on and off which can move the web backward.
According to this embodiment, the control device can selectively stop the transport mechanism or even reverse its driving direction when the driving means which move the wed backward are activated. Except when the driving direction is reversed, a buffer should be provided between the transport mechanism and the driving means in which an amount of the web can be stored, whereby said buffer should of course be larger in case the transport mechanism just continues working than when it is brought to a standstill.
According to a practical embodiment, the machine contains a cross cutting mechanism for cutting the web, whereas the control device contains means to control the cross cutting mec
REFERENCES:
patent: 4573670 (1986-03-01), Felix
patent: 4597752 (1986-07-01), Muller et al.
patent: 4810239 (1989-03-01), Moss
patent: 4846454 (1989-07-01), Parkander
patent: 5062597 (1991-11-01), Martin et al.
patent: 5360213 (1994-11-01), Crowley et al.
Ark Darren
Hail III Joseph J.
Web Converting Equipment, naamloze vennootschap
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