DE1611278A1 - Device in the folder, especially in rotary printing machines, for automatically cutting the paper web and stopping the machine - Google Patents

Description

Schnellpressenrabriic Frankenthal Albert & Cie AG

Frankenthal / Pfalζ

Device in the folder, especially of rotary printing machines, for the automatic cutting of the paper web and stopping the machine

The invention relates to a device in the folder, in particular of rotary printing machines, for automatic cutting of the paper web and stopping the machine when Absence of a normal folded product at a reflective point on a folder cylinder, with a a light beam that can be registered by a photocell generates a switching pulse triggers.

Such devices are used when in the folder Irregularities. Occur when collecting or folding, which can lead to stoppages, serious consequences such as damage or even to avoid destruction of cylinders, bearings and drive elements of the folder.

In a known device of this type, the light beam is emitted in the machine cycle, so that the pulse is emitted Can only be successful if the sensor is scanned by the photocell If you run normally, place it next to the one in question Folded product due at the time is missing. The response the photocell on the light beam takes place through a different intensity of the reflection, depending on whether it comes from the folded product (paper) or from the one below located part of the folder (cylinder or reflective shaped part), since the angle of reflection is the same in each case.

According to the knowledge on which the invention is based, the known device has various disadvantages : it is cumbersome and expensive due to the light radiation depending on the machine cycle and requires complicated adjustments;

009850/0034

the intensity differences for the response of the photocell are small and therefore slightly susceptible to interference ', ζ “3. senone due to the large amounts of paper dust that accumulates, which requires special wiping devices to be avoided.

The invention is intended to avoid all of these disadvantages will. This is achieved according to the invention by arranging the reflection point, which is preferably lined with reflective film, in one of the malt flaps of the malt flap cylinder in FIG Direction of rotation downstream of the cheek section of the cylinder groove used for immersing a wiper tongue.

In the invention, the spatial position of the reflection point on the malt product or on the paper web differs from that of the Reflective tape off, so that the angle of reflection when properly Malt product is completely different from the flour of one of these. In the first mall he can really go out the reflection recording area of the photocell to be burned out.

An embodiment of the invention is shown in the drawing. It shows

Mig »1 shows a cross section through a jaw valve cylinder with proper malt product unu

Mig. 2 a longitudinal section to Mig »1, but without Malt product.

From the j'alz flap cylinder 1, which is located in the ü'ig. 1 rotates in the direction indicated by the arrow P, the malt flap 2 can be seen, which holds a malt product 3. The malt product 3 covers a certain portion of the Oberfläcne 'of Ji'alzklappenzylinders 1 with its cylinder grooves 4. This cylinder grooves 4 dienes for dipping not shown in the Zeicnnung Abstreifzungen for malt products _o At a cheek 5 of a cylinder groove 4 is attached a reflection film. It extends from the malt flap 2 to just before the end of the malt product 3 - A photocell 7 is arranged next to the malt flap cylinder 1. Its optical axis is slightly inclined to the axis of the malt flap cylinder in a plane containing these two axes. The photocell 7 forms a structural unit with the light source and has a narrowly limited measuring angle in order to eliminate interference caused by external light from the side.

009850/0094

■ - 3 - ■■■■■. -

- The one from the light source under the particular from Figo ί recognizable \ 7winkel emitted light beam is from the bare surfaces of the I'al zlciappenzy Linders 1 or ,, from any paper on it (for example from the ialzproduKt 3 in Fig. 1) according to the law of reflection reflected away by the photo cell 7. Likewise, the free catch 5 of the cylinder groove 4 slurping light in the direction reflected on the bottom of the cylinder groove 4. The one with the .rteflexxonsfolie 6 lined catch section 5 is at normal workflow of the folded product 3 covered. Consequently In this case, the photocell 7 cannot receive a light reflex from any point. «The light source can burn all the time.

If, on the other hand, a malt product falls as a result of a malfunction (like "For example m Fig«, 2 shown) or in its position is shifted so that the reflective film 6 is exposed, may its special reflective properties - like a mirror, it does not have a specific one Flexion diaper, but because of its surface texture or the glass beads embedded in it almost 120 ° angle of reflection - light when turning past reflect in the photocell 7, as a switching pulse triggers, which stops the lascnine and cuts the paper web and rejects.

009850 / 009A

BATH

Claims (1)

Claim Device in the folder, in particular of rotary printing machines, for automatic cutting of the paper web and shutdown of the machine in the absence of a normal one Folded product at a reflective location of a folder cylinder, one of a Emergency cell recordable light beam a switching pulse triggers, marked by the arrangement of the flexion point, which is preferably lined with reflective film (6) in one of the jaws (2) of the jaw cylinder (1) in the direction of rotation downstream of the cheek section (5) of the Immersion of a wiper tongue serving cylinder groove (4).