Severing by tearing or breaking – Breaking or tearing apparatus – Work-parting pullers
Patent
1984-01-12
1986-03-25
Yost, Frank T.
Severing by tearing or breaking
Breaking or tearing apparatus
Work-parting pullers
270 525, B65H 3510
Patent
active
045777896
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for severing single-layer or multi-layer sets of endless forms or the like provided with transverse perforations, with a tear-off arrangement of two transporters arranged with spacing from one another in the transport path of the set, which may be formed by transport roller pairs holding the set between them, the forward transporter in the transport direction being drivable with higher speed than the rear transporter in order to generate, in the section of the set situated between the transporters, a tension stress instigating the tearing of one of the transverse perforations.
In a known device of this kind the two transporters each run at constant speed, the forward transporter running faster than the rear. As soon as the leading end of the set is grasped by the forward transporter, the latter exerts an increasing traction upon the length of the set between the two transporters, until finally the set tears in this region along a transverse perforation. The torn-off forward piece of the set is transported further by the forward transporter with the comparatively higher speed to a reception box, whereas the following leader end of the endless form set is moved with the lower speed to the forward transporter. As soon as this new leading end is grasped by the forward transporter a tension stress builds up again in the set, leading finally to the tearing off of the next piece of the set. The distance between the two transporters must here be adapted to the selected length of the set piece to be severed; the distance as a rule corresponds to this length, this is because in the case of a shorter distance the tension stress builds up too soon and the set tears off too soon, possibly on an intermediate transverse perforation.
On the other hand it is the problem of the invention to prepare a device of the initially stated kind which, without variation of the distance between the transporters, is suitable for the severing of endless form sets with different lengths of the pieces of the sets to be severed.
This problem is solved in that the transporters are drivable according to choice with the same and different speeds in dependence upon the position of the transverse perforation to be severed next. The transporters, which may be arranged at relatively short distance from one another, are driven at the same speed until the transverse perforation to be severed comes into the transporter region. Now the two transporters are driven at different speeds, namely the forward transporter at higher speed than the rear transporter. Consequently a tension stress builds up in the section of the set between the transporters, leading finally to the tearing apart of the set along the previously fixed transverse perforation. Now the two transporters can again be driven at the same speed until the transverse perforation to be severed next comes into the region of the transporters, and so forth. Accordingly set pieces of greatly differing lengths can be severed with one and the same transporter arrangement. The short distance between the two transporters results in an advantageously compact structural form of the device. It is also of special advantage that by reason of the possible short distance between the transporters it is ensured that the transverse perforation actually to be severed is exclusively situated between the transporters during the severing phase, whereas in the known device it is also possible for one or more intermediate transverse perforations to be arranged in this section, so that in the known device it is not impossible for the wrong transverse perforation to tear apart. Therefore the device according to the invention guarantees reliable severance function in each case at the predetermined position of the set.
In accordance with the invention an automatic operation of the device is also possible. In this case a control apparatus is provided to receive information as to the length of the set pieces to be severed and to emit speed command signals to the forward and/or rear transp
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Hofmann Horst
Reckert Jurgen
Systemform Datenbelege GmbH
Yost Frank T.
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