GB2037400A - Rollers - Google Patents

Abstract

A roller has one end arranged to impart precessional motion to the roller in order to impart transverse motion to a web of material carried by the roller, the end of the roller having a stub shaft 9 which can be displaced from the roller axis 6 to any selected eccentric position. The stub shaft is mounted on a disc 7 rotatable about an axis 5 in a cover 3 by a worm wheel 11 in mesh with and rotatable by a worm 16. The worm 16 is fixed on a diametral shaft 17 at one outer end of which is fixed a pinion 15. The latter is in engagement with a toothed rim 14 of an externally milled adjusting ring 13 rotatably mounted by a ball bearing device 12 on the periphery of the cover 3. When the ring 13 is manually turned, the worm wheel 11 turns the disc 7 by means of a pin and the position of the stub shaft 9 is thereby changed in relation to the roller axis 6. <IMAGE>

Description

SPECIFICATION Traversing motion device including a roller This invention relates to a traversing motion device comprising a roller rotatably mounted at each end, one end being eccentrically mounted to impart precession motion to the roller.

To prevent the formation of bulges at the edges of a roll of sheet material, it is known to equip a traversing motion device with rollers which have a traversing motion of their axes. A web of sheet material carried by the device thus undergoes an alteration in its transverse direction which also has an effect in the longitudinal direction. During this movement, additional relative movements take place between the roller and the web, with the result that the selvedge of the material can become unevenly placed on a winding lap, so that folds form in the material. The friction due to the sliding movements between the material and the surface of the roller produces an electrostatic charge in the material, which not only causes the material to become more heavily soiled but may endanger the operator.In other known forms of such a device, the winding lap is shifted axially so that the material on it must also be shifted.

In view of the disadvantages of the known devices, it has been proposed to simplify them and provide for accurate placing of the edges of the web when formed into a roll, and for this purpose a roller is mounted on a shaft and is connected to the shaft by way of a planet gear, the pinion of which is rotatably mounted on a stud fixed to the roller, one sun wheel of the planet gear being fixed to the shaft and the other sun wheel being fixed to an end face of an eccentric and to an eccentric mounting shaft which is mounted in a swing bearing.

It is an object of the present invention to provide a further improvement in the continuous adjustment of the known eccentric mounting shaft, using simple constructional means, so as to provide for manually selected adjustment of the magnitude of the precession movement during rotation of the roller.

According to this invention a traversing motion device comprises a roller rotatably mounted at each end, one end being eccentrically mounted to impart a precession motion to the roller, the said one end having a stub shaft, wherein the stub shaft is arranged on an adjustment disc mounted in a cover on the said one end, which disc is rotatable about an axis parallel to the axis of the roller and is fixed to a worm wheel which engages with a worm arranged substantially perpendicular to the axis of the roller, the adjustment disc and the stub shaft being adjustable by a pinion connected to the worm and in engagement with a toothed adjustment ring rotatably mounted on the cover.

An advantage of the invention is that all the components necessary for adjusting the eccentricity of the eccentric scrub shaft or the magnitude of the precession movement are within the roller. The adjustment means is situated in the circumferential region of the roller, an adjustment ring, easily adjusted manually being arranged on that end of the roller which is eccentrically adjustably mounted. When the adjustment ring and its toothed rim are turned, a pinion fixed to the end of a worm and in engagement with the toothed rim, is rotated about its axis, whereby a worm wheel which engages with the worm, and an adjustment disc connected to the worm wheel, are rotated about-the axis of the disc together with an eccentric stub shaft mounted on the disc.The eccentric stub shaft can be displaced between the axis of the roller and the largest radius of the cover, depending on the amount of displacement of the adjustment ring, so that the precession motion or eccentricity of the roller is infinitely adjustable between zero and a maximum setting.

This also permits adjustment while the roller is in operation.

An embodiment of the invention is described below by way of example with reference to the drawings, in which: Fig. 1 is a section through one half of a travesing motion roller having a cover with an eccentric mounting stub shaft on one of its end faces; and Fig. 2 is an elevation of the cover.

Referring to the drawings, Figure 1 shows that end face 1 of a traversing motion roller 2 which is to be eccentrically adjustably movable.

A cover 3 is mounted on the end face and fixed to it by screws 4, 4'. An adjustment disc 7 mounted in the cover 3 is rotatable about an axis 5 which is displaced from and parallel to the roller axis 6. On its external surface, the adjustment disc 7 mounts an eccentric stub shaft 9 for mounting the roller, the axis 8 of the shaft being displaced from but parallel to the axis 5 of the disc 7. On its inner surface (i.e. its surface facing the roller), the disc 7 is fixed by a pin 10 to a worm wheel 11 rotable about the axis 5. A peripherally milled adjustment ring 1 3 is rotatably mounted on a ball bearing ring 12 which in turn is mounted on the circumference of the cover 3.The adjustment ring 13 has a toothed rim 1 4 on its inner face (i.e. its surface facing the roller). the rim 1 4 engages a pinion 1 5 fixed to a worm 18 arranged perpendicularly to the axis 6 of the roller 2. Thus when the cover is rotated about the axis 6, the rim 14 turns the pinion 1 5 and with it the worm 1 6 about an axis 17, so rotating the worm wheel 11 together with the adjustment disc 7 fixed to it by the pin 10, and also the eccentric roller-mounting stub shaft 9.

Referring to Figure 2, it will be seen that the axis 8 of the stub shaft 9 in the position shown coincides with the axis 6 of the roller 2, so that the eccentricity in this adjustment position is zero and the roller 2 does not therefore execute any precession or traversing motion. The adjustment disc 7 with the stub shaft 9 have been set in the zero position by means of the adjacent ring 13, toothed rim 14, pinion 15, worm 16, and worm wheel 1 , the amount of the eccentricity can be adjusted using a mark 1 9 on the cover 3 and a graduated scale 1 8 on the adjustment disc 7.

Adjustment of the eccentric stub shaft 9 to obtain a particular amount of eccentricity and precession or traverse motion of the roller 2 is effected by manual rotation of the adjustment ring 13. The stub shaft 9 is thereby shifted to a required position between zero and the maximum indicated on the scale 1 8 by the marker 1 9.

Claims (6)

1. A traversing motion device comprising a roller rotatably mounted at each end, one end being eccentrically mounted to impart a precession motion to the roller, the said one end having a stub shaft, wherein the stub shaft is arranged on an adjustment disc mounted in a cover on the said one end, which disc is rotatable about an axis parallel to the axis of the roller and is fixed to a worm wheel which engages with a worm arranged substantially perpendicular to the axis of the roller, the adjustment disc and the stub shaft being adjustable by a pinion connected to the worm and in engagement with a toothed adjustment ring rotatably mounted on the cover.

2. A device according to claim 1, wherein the amount of eccentricity of the stub shaft is indicated on the adjustment disc.

3. A device according to claim 2 wherein the adjustment disc and the cover have a marking corresponding to the amount of the eccentricity.

4. A device according to any preceding claim wherein the adjustment ring is manually adjustable.

5. A device according to any preceding claim wherein the adjustment ring has a toothed rim rotatably mounted on the circumference of the cover.

6. A traversing motion device constructed and arranged substantially as herein described and shown in the drawings.