DE2939649A1 - PNEUMATIC REEL SHAFT - Google Patents

Description

Heberlein Textildruck AG. 9630 Wattwil Pneumatic winding shaft

The invention relates to a pneumatic winding shaft for winding webs of material

are / iateri albahnen of paper, textiles or plastic sheets to cardboard, plastic or metal sleeves wound, said sleeves before the winding operation on the winding shaft pushed open and after completion of the winding to be removed from the shaft. During the winding process, the sleeve must be secured against rotation on the winding shaft in order to be able to absorb the considerable torques or braking torques that occur.

So-called expansion winding shafts are already known, which are designed as hollow shafts and have an inflatable rubber tube inside . Openings are attached at intervals on the shaft jacket, through which radially movable bolts with cam-like end parts are guided. When the rubber hose is inflated , the bolts are pressed outwards and fix the sleeve on the winding shaft.

030016/0792

However, such expansion winding shafts have the disadvantage that they are relatively complicated and expensive. In addition, because of the radially movable Due to the unfavorable space conditions caused by bolts, the shaft diameter cannot be kept as small as desired,

The aim of the invention is to create a pneumatic winding shaft in which the disadvantages of the known Expansion winding shaft can be avoided.

This is achieved according to the invention in that the hose extends in at least one line along a connecting line of the radial bores extending area is not connected to the outer surface of the core is «The compressed air flowing in through the bores penetrates the areas mentioned and presses the hose against the inside of the winding tube.

The radial holes in the core and the areas in which the outer surface of the core and the hose are not connected to each other, can extend along surface lines, which evenly on the pipe circumference are distributed, extend.

030016/0792

Furthermore, the radial bores and the areas in which the outer surface of the core and the hose are not connected to each other, are spaced on circumferential lines or are along a Extend the helical line on the outer surface of the core.

The winding shaft according to the invention has the advantage that no radially movable bolts and cams are required so that it is relatively simple and thus inexpensive and with relatively small outer diameters up to approx. 30 - 35 mm can be produced »

Some exemplary embodiments are explained in more detail below with reference to the figures of the drawing. Show it in a purely schematic representation:

Fig. 1 is a central longitudinal section of the entire winding shaft with sleeve and winding

2 shows a central longitudinal section of part of the rocker shaft

Fig. 3 shows a cross section according to line A-A in Fig.

0 30016/0792

1 shows the entire winding shaft with an opened cardboard tube 12 and a fabric roll 13. The steel pins 14, 14 'are pressed into the ends of the tubular core 1 and welded to the pipe ends. In the steel pin 14 is also a check valve 16 and a pipe 17 for supplying compressed air to the both sides hermetically sealed cavity 18 of the core available ₀

030016/0792

The Gunimi tube 2 rests on the core 1, v.'elcher is vulcanized onto this in places. To protect the ends of the Guitmischhose 2 are two conical steel sleeves 15, 15 'pressed onto the core 1, which at the same time facilitate the pushing on and removal of the sleeve 12. The core 1 has three radial bores 6 evenly distributed along its circumference, 7, 8, as can be seen from FIGS. 2 and 3. The rubber hose 2 is in the along the mentioned Areas 20, 21, 22 extending over the surface lines are not vulcanized onto the core 1.

The compressed air introduced into the cavity 18 flows through the bores 6, 7, 8 and presses the rubber hose into the Areas 20, 21, 22 against the inside of the cardboard tube 12, so that it cannot rotate on the winding shaft is fixed. This fixation can be released and the sleeve removed by releasing air.

030016/0792

Claims (4)

Hebertain Textildruck AG., Ch 9630 Wattvil patent claims 1. Pneumatic winding shaft with a tubular core and an airtight cavity and means for supplying air into the interior of the pipe, the jacket surface of the core is provided with radial bores extending into the inside of the pipe and one on the outer surface of the core lying on top and in places with this firmly connected hose made of elastic material, thereby characterized in that the hose (2) in at least one, extending along a connecting line of the radial Bores (6, 7, 8) extending area (20, 21, 22) is not connected to the outer surface of the core (1). 2. Winding shaft according to claim 1, characterized in that the radial bores (6, 7, 8) in the core (1) and the Areas (20, 21, 22) in which the outer surface of the core (1) and the tube (2) are not connected to one another are along surface lines, which are evenly distributed over the circumference of the pipe. 3. Winding shaft according to claim 1, characterized in that the radial bores (6, 7, 8) in the core (1) and the areas in which the outer surface of the core (1) and the hose (2) are not connected to one another 030016/0792 at intervals on the circumferential lines of the outer surface of the core (1). 4. Winding shaft according to claim 1, characterized in that the radial bores (6, 7, 8) in the core (1) and the areas in which the lateral surfaces of the core (1) and the hose (2) are not connected to each other are longitudinal extend a helical line on the lateral surface of the core (1). 03 Ü016 / 0792