Drives pertaining to a reel changer

Abstract

A drive for a reel changer includes at least one electric motor. This drive is used to rotatably drive a web supply roll that is held in the reel changer. A web of material is wound on the supply roll. The electric motor is embodied as a synchronous motor.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is the U.S. national phase, under 35 USC 371, of PCT / EP2005 / 050308, filed Jan. 25, 2005, published as WO 2005 / 073114 A2 on Aug. 11, 2005 and claiming priority to DE 10 2004 004 759.6, filed Jan. 30, 2004 and to DE 10 2004 030 490.4, filed Jun. 24, 2004, the disclosures of which are expressly incorporated herein by reference.FIELD OF THE INVENTION [0002] The present invention is directed to drives of a reel changer. The drive includes at least one electric motor which drives a material reel, held in the reel changer, in a rotational manner. BACKGROUND OF THE INVENTION [0003] EP 1 155 987 A2 discloses a reel changer for a printing press. To drive the supply reels in this reel changer, three-phase asynchronous motors, general rotary current motors or alternating current motors, universal motors, or direct current motors are provided. In accordance with one embodiment, the supply reels may be driven only on one side of the ...

AI Technical Summary

Benefits of technology

[0023] A further advantage of the present invention particularly lies in combining the generally already known virtues of a tensile receiving shaft with the advantages of a direct central drive of a supply reel. In this manner, the component cost, as well as the complexity of the machine are reduced. The device of the present invention overall is more compact and simpler than prior devices, while maintaining at least an equally high level of functionality. On the receiving shaft, there is a fixing device that may be set to either a work position or an idle position in order to either fix the core of a supply reel in the receiving position or to release it again. The rotational drive momentum is transferred to the supply reel through a hollow shaft which is provided as a motor drive shaft, and which is preferably embodied as one piece with the receiving unit.

[0024] The process of fixing the reel onto the receiving unit may be activated by the use of an adjustment element that is axially mounted in the hollow shaft. The hollow shaft has recesses in which a spring element is disposed. The spring element ensures that a core tension acts on the adjustment element so that the adjustment element guides the fixing device back into an idle position that fixes the supply reel in place. An activation device is arranged on the adjustment element, on a side that is opposite to the receiving unit in an axial position. This activation device switches the adjustment element into a working position, which releases the supply reel. In addition, a decoupled arrangement is provided, in the idle position, between the fixed activation device and the adjustment element that rotates with the hollow shaft and which is due to a distance that arises between these two components. The purpose of this arrangement is to prevent friction between the fixed activation device and the rotating adjustment element.

[0025] It is practical for the activation device to be diaphragm or a membrane cylinder that is disposed in an extended axial direction of the adjustment element. In order to be able to construct the diaphragm cylinder in a smaller fashion and to make the device more compact, the activation device is a lever mechanism with a lever arm that may be activated by a diaphragm cylinder which is disposed in a parallel axis orientation with respect to the electric motor.

[0026] Two receiving shafts, for use in guiding a supply reel, may each have an electric motor as a drive. In this manner, the rotational momentum output, which would otherwise be required from one electric motor, is divided between two electric motors, which two electric motors can therefore each have smaller dimensions.

[0027] An ejector unit, for use in removing the material reel from the receiving unit, may be disposed in the axial direction and concentric to the receiving unit. In order to activate the ejector unit, the adjustment element may be used. More preferably, pneumatic cylinders may be provided and which are embodied parallel to the central axis.

Problems solved by technology

It is not possible to tense the cones.

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