DE1120857B - Device for controlling the knife movement in a machine for the helical winding of paper tubes - Google Patents

Description

The invention relates to a device for controlling the axial and, at the same time, radial knife movement in a machine for the helical winding of paper tubes with a knife movement causing, on a pipe sleeve with the pipe axially displaceable coupling ring.

It is known to control the knife with the aid of the advanced paper tube, a stop plate being used which is coupled to the knife is. This design has the disadvantage that the end of the paper tube from the stop plate is loaded, whereby the pipe can be deformed.

In one of these known devices for cutting tubes from paper or another cut material, the pipe end acts on a stop plate, which a coupling via a linkage actuated, which connects a cam disk with a rotating gear. The cam disc acts via an angle lever on a disk, which is displaceable on a stationary sleeve surrounding the tube is stored. On the inner circumference of the stationary sleeve is a pipe to be cut off also surrounding sleeve rotatably mounted, which is drivable at one end and at the other Has several knife rollers at the end, which circle with the bushing around the pipe and when moving the disc, which is conically widened at its edge, is pressed against the pipe via levers and tapered rollers and cut it off at this point. As the force to turn on the clutch from the end of the paper tube must be applied, this end can be easily deformed.

But it is also already known, the knife by means of the acted upon by the tube end plate over a Operate electromagnets. The knife is arranged on a circumferential sleeve, which on a hollow rod is mounted longitudinally displaceable, and is directly from the constant speed moving paper tube against the force of a spring located inside the hollow rod is located and the knife returns after the cutting process, taken along. With this arrangement the end of the pipe is subjected to an unusually high load, namely by a spring force rotating knife.

The prior art also includes a machine for producing helically wound Tubes with a winding mandrel, a winding device for helical winding a strip with control marks on the winding mandrel and for simultaneous axial VerVorrichtung

to control the knife movement

in a machine for helical

Winding paper tubes

Applicant:

Döring and others, working group
for the development of paper processing machines,
Düsseldorf-Reisholz, Henkelstr. 243

Mathias Pröpper, Düsseldorf-Wersten,
has been named as the inventor

pushing the pipe and a cutting device for cutting off pieces of pipe of a certain length. The cutting device is actuated from the pipe end via a plate. The cutting device is on a slide, which is next to the pipe to be cut at its speed is displaceable and from which the cutting knife or the saw can be lowered transversely into the pipe. The parallel guidance of the cutting element next to the workpiece results in a more complex and complex one Structure which the invention aims to avoid.

This is according to the invention in a device for controlling the axial and at the same time radial Knife movement in a machine for the helical winding of paper tubes with a die Knife movement causing, on a pipe sleeve with the pipe axially displaceable coupling ring achieved in that the coupling ring is provided with drivers and the tubular sleeve as a carriage is designed to move the knife arranged on parallel links. The drivers take hold of the coupling ring on the part of the paper tube that is not yet to be separated.

In the practical implementation of a device according to the invention, in addition to the paper tube two rods or the like. Be arranged for the car, on which a switching ring for the circulating Mit-

109 757/37

slave is slidably mounted. This switching ring acts via roller bearings on a circumferential pressure ring, which is in connection with the drivers guided in the support ring. The support ring be supported on roller bearings which are held on the car by means of bolts or the like.

This design of the cutting device has the advantage that the cut paper tubes not be damaged. Another advantage can be seen in the fact that the cutting device fans out is under construction as the known cutting devices, in which the ends of the freshly wound Paper tubes are more or less heavily loaded and thus deformed.

In the drawing, an embodiment of a control device according to the invention is schematically shown, namely shows

Fig. 1 is a plan view,

FIG. 2 shows a longitudinal section through the driver and FIG. 3 shows a view of the driver.

The endlessly wound paper tube 1 is fed to the cutting device from the right (FIG. 1). The end face la of the paper tube abuts against a contact device 2 which is used to switch on a magnet 3 (FIG. 2). If the magnet is switched on, the driver 4 comes into effect. This driver is connected to the rotating knife 6 via a push rod 5. This knife is mounted in a known manner in a sleeve 7 which is controlled by rods 8. The knife 6 is driven by an electric motor 9 via V-belts 10.

The driver device 4 consists of a carriage 11 which is provided with lateral eyes 11a and Ub (FIG. 3) which can slide on guide rods 12 and 13. These rods lie parallel to the paper tube 1, as can be clearly seen in FIG. A switching ring 14 is axially displaceable on the tubular part of the carriage 11 , via a double lever 15 which is connected to the magnetic core 3 α . The switching ringl4 carries several roller bearings 16 which lie against a pressure ring 17.

On the end face of the carriage 11 there are several bolts 18 on which roller bearings 19 are also arranged. These roller bearings 19 hold a support ring 20 in which the bolts 21 are guided on driver segments 22. The bolts 21 have a head 21 α, which lies against the conical pressure bar 17 α of the pressure ring 17. Springs 23 are used to return the segments.

When the cardboard tube 1 is advanced, the end face la hits against the switching arm 2 a of the switch, so the magnet 3 is switched on. Here (according to FIG. 2) the switching ring 14 is moved to the right, whereby also the pressure ring 17 with its bar 17 a is shifted to the right. Here, the bar acts 17 a on the bolts 21 and thus on the segments 22, which rest on the cardboard tube 1 and on the further Feeding the cardboard tube causes the entire device to be carried along. When the driver device is shifted to the left, the knife 6 is controlled accordingly to the left and can Now cut into the cardboard tube during the further advance in order to cut off the desired length.

Claims (5)

PATENT CLAIMS: 1. Device for controlling the axial and at the same time radial knife movement in a machine for the helical winding of paper tubes with a coupling ring which causes the knife movement and is axially displaceable on a pipe sleeve with the pipe, characterized in that the coupling ring (20) with drivers (22) provided and the tubular sleeve is designed as a carriage (11) for moving the knife (6) arranged on parallel links (8). 2. Apparatus according to claim 1, characterized in that the drivers (22) of the coupling ring (20) attack the part of the paper tube (1) that is not yet to be separated. 3. Apparatus according to claim 1 and 2, characterized in that in addition to the paper tube (I) two rods (12, 13) or the like for the car (II) are arranged on which a switching ring (14) is slidably mounted for the rotating driver (22). 4. Apparatus according to claim 1 to 3, characterized in that the switching ring (14) over Rolling bearing (16) acts on a circumferential pressure ring (17) which is guided with the in the support ring (20) Driver (22) is in connection. 5. Apparatus according to claim 1 to 4, characterized in that the support ring (20) on roller bearings (19) which are held on the carriage (11) by means of bolts (18) or the like. Considered publications:
U.S. Patent Nos. 2734 432, 1709 369, 325 173. For this purpose, 1 sheet of drawings © 109 757/37 12.61