DE1156635B - Pressure fluid operated knife holder for slitter rewinder - Google Patents

Description

INTERNAT. KL. D 21 g

GERMAN

PATENT OFFICE

D 36769 Vnb / 55e

REGISTRATION DATE: AUGUST 9, 1961

NOTIFICATION OF REGISTRATION AND ISSUE OF
EDITORIAL: OCTOBER 31, 1963

The invention relates to a pressure medium-operated knife holder for roll cutting machines, for example for cutting paper and cellulose webs, each with a spring-loaded piston for lowering of the circular knife on the track and for the sideways adjustment of the circular knife to the lower knife.

This known knife holder only requires a common pressure medium connection for both pistons. It must be ensured that when pressure medium is applied first the lowering and then the adjustment takes place because otherwise the knife through the adjustment movement with the cutting edge on the counter knife could be pressed, whereby both circular knives would be damaged.

In the known knife holder, the spring loading of the two pistons is graduated so that of the associated movements when applied via the common pressure medium connection first the lowering on the track and then the axial adjustment of the knife to the counter knife take place.

This sequence of knife movements had to go through considerable with the known knife holder Differences in the spring loading of the two pistons are enforced because when initiating the Movement is the considerable and not appropriately graduated static friction between piston and cylinder to the spring loading occurs.

However, a considerable gradation of the spring load requires a correspondingly large counter pressure of the Pressure medium, which affects the profitability of the system.

With the invention, the initiation of the lowering movement before the adjustment movement is reliably enforced, even with low spring loads and correspondingly low gradation of the spring load, in that the axial connecting bore for the two pressure chambers at the upper end has a radial bore which is arranged in such a way that it is in the rest position of the lowering piston is located just above the lowering pressure chamber and, after a short lowering movement, connects the pressure chamber with the axial bore.

The harmful influence of piston friction, especially during the control movement, is shown in Further development of the invention is further reduced by the fact that both the adjusting piston and the lowering piston are provided with grooved sealing rings.

The invention is based on the in

Fig. 1 in axial section and in

Fig. 2 explained in more detail the embodiment shown in side view.

Pressure medium operated knife holder
for slitter winder

Applicant:

Karl Rud. Dienes manufacturing company

for machine spare parts

with limited liability,

Vilkerath near Cologne

Peter Wingen, Overath,
has been named as the inventor

The knife holder has a knife head 1 on which the hub 3 is mounted by means of ball bearings 2, on the circumference of the circular knife 4 with the plate springs 6 supported against the shoulder 5 can be exchanged is attached and pressed against the opposite shoulder 7.

The cutter head 1 is on the adjusting piston rod 8 with the adjusting piston 10, the one in a Groove arranged sealing ring 9 has to the right against the loading of the return spring 12 by the pressure medium employed up to the adjustable stop 11.

The cutter head is attached to the piston rod 13 of the lowering piston 14 and connects via a axial bore 15 the pressure chamber 16 of the lowering piston with the pressure chamber 17 of the adjusting piston. The return spring 12 of the adjusting piston is stronger than the piston area compared to the associated piston area Load by the return spring 18 of the lowering piston, so that when pressure medium is applied over the nozzle 33 of the cutter head is first lowered and then turned on, while when the Press the movements in reverse order. The correct initiation of this is enforced Movements through the radial bore 20, which the connection of the adjustment pressure chamber 17 via the Axial bore 15 with the lowering pressure chamber 16 only releases after the lowering movement has been initiated, if the static friction of the guide of the lowering piston has already been overcome.

The lowering depth is by means of the lock nuts 21, which are on a thread 22 on the lead out upwards Extension of the lowering piston rod 13 sit, adjustable beforehand. The thread 22 on the

309 730/181

relatively thick piston rod can be slightly surface-hardened and does not affect the Space available for the lowering movement between the lowering cylinder and cutter head 1.

For the same reason, the non-rotatable guide of the lowering piston rod 13 is provided by means of screws 26 lower adjusting cylinder cover 23, which can be adjusted in circumferential slots, is drawn into the lowering cylinder: A disc spring 25 is with its convex side in a correspondingly concave recess the lowering piston rod 13 fixed positively, possibly with the help of a countersunk screw 31, while the prismatic surface of the disk spring 25 is in an axial groove of the lower cylinder cover 23 is performed.

Claims (2)

PATENT CLAIMS: 1. Pressure medium-operated knife holder for roll cutting machines, for example for cutting paper and cellulose webs, each with a spring-loaded piston for lowering the circular knife onto the web and for lateral positioning of the circular knife on the lower knife, the spring loading of which is graduated so that when pressure medium is applied first the lowering and then the adjustment take place, whereby a common pressure medium connection is provided for both pistons and the lowering piston rod contains an axial connecting bore for the pressure chambers to the two pistons mentioned, characterized in that the axial connecting bore (15) at the upper end has a radial bore ( 20), which is arranged in such a way that in the rest position of the lowering piston (14) it is located just above the lowering pressure chamber (16) and, after a short lowering movement, connects the pressure chamber (16) to the axial bore (15). 2. Knife holder according to claim 1, characterized in that both the adjusting piston (10) and the lowering piston (14) are provided with grooved sealing rings (9). Considered publications:
German interpretative document No. 1024 341. 1 sheet of drawings © 309 730/181 10.63