Abstract:
The position-controlled stopping of rotating components of shaftless drive mechanisms, in the case of a loss of voltage, is accomplished by the provision of an external connectable network. That external connectable network supplies the process power which is missing due to a loss of rotational power in the event of a voltage loss.

Description:
The present invention is directed to a device for position-controlled stopping of rotating components with position-controlled drive mechanisms in the case of a voltage loss. The rotating component is supplied with a necessary differential energy from an external network. 
   BACKGROUND OF THE INVENTION 
   In the case of a voltage loss, the drive mechanisms of a production train, such as the drive mechanisms of a web-fed rotary printing press, are shut down in a controlled angularly synchronous manner in order to thus prevent a rupture or a breakage of the web. Units with excess kinetic energy, such as, for example, rotating centrifugal masses, are brought to a stop within the normal rapid stop sequence through controlled reduction of the kinetic energy, for example, by the use of braking resistances, such as so-called bleeders. 
   Those units such as, for example, folding apparatuses, which cannot themselves supply enough rotational energy in relation to the required process energy during the normal rapid stopping time, are continuously operated by the provision of external, uninterruptible power supplies, so-called UPS&#39;s, in order to be able to exert the required process energy in case of a voltage loss. 
   “MACHINE DRIVE” RESEARCH DISCLOSURE, KENNETH MASON PUBLICATIONS, HAMPSHIRE, GB, No. 297, 1989, pp. 23 to 24 describes a device for the position-controlled stopping of rotating components in the case of a voltage loss. The energy required for this position-controlled stoppage is supplied by a battery. 
   However, this publication discloses neither which part of the regulator the battery is connected to nor what type of motor is used. 
   SUMMARY OF THE INVENTION 
   The object of the present invention is to produce a device for the position-controlled stopping of rotating components with position-controlled drive mechanisms in the case of a voltage loss. 
   This object is attained in accordance with the present invention by supplying the rotating components with a necessary differential energy. An external network is provided to supply this differential energy and it includes a battery. The battery can be connected to an intermediate DC element of a drive converter. The drive mechanisms which are used to drive the rotating components are three phase motors. 
   The advantages that can be achieved with the present invention are comprised particularly in that those units with an insufficient inherent kinetic energy for accomplishing their own controlled stopping are supplied only with the differential energy quantity required for the stopping process. The supplied differential energy quantity is the difference between the existing rotation energy quantity and the process energy quantity required for the respective drive mechanism to properly stop the particular unit. 
   In a second preferred embodiment of the present invention, some components of a conventional UPS can also be eliminated in that only the energy storage device of the UPS is used. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The present invention will be explained in detail below in conjunction with two preferred embodiments and as depicted in the accompanying drawings, in which: 
       FIG. 1  shows a schematic circuit diagram of a circuit arrangement in accordance with the present invention in a first preferred embodiment; and 
       FIG. 2  shows a schematic circuit diagram of a circuit arrangement in accordance with the present invention in a second preferred embodiment. 
   

   DESCRIPTION OF THE PREFERRED EMBODIMENT 
   Referring initially to  FIG. 1 , a rotating component  01 , such as, for example, a folding apparatus of a web-fed rotary printing press, is driven in a speed-controlled and position-controlled manner by the use of a shaftless drive mechanism  02 , such as an electric motor. The electric motor  02 , which is preferably a three-phase motor, receives its energy supply via a line  03  from a generally conventional drive converter  04 , which is connected, via a line  06 , an electronic switch  07 , a network-disconnecting switch  08 , and a line  09  to an operating network  11 , of, for example, 400 Volt three-phase current. 
   The drive converter  04  can be comprised at least of sub-units, which are not specifically shown, such as a rectifier, an intermediate DC circuit, a DC-AC converter, and a control element. In addition, the drive converter  04  can contain a dropping resistor or bleeder in order to convert excess braking energy into heat if necessary. 
   For the eventuality of a voltage loss of the operating network  11 , the drive converter  04  is connected, via a line  12 , to an electronic switch  13 , which is parallel to the switch  07  and which switch  13  is connected, via a network-disconnecting switch  14  and a line  16 , to an external network  17  with, for example, an external uninterruptible power supply  17 , a so-called UPS or uninterruptible power supply network  17 , of, for example, 400 Volt AC current. 
   Between the drive converter  04  and the two electronic switches  07  and  13 , control lines  19  are provided, which control lines  19  are depicted with dashed lines in  FIG. 1 . A tachometer generator T, which is coupled to the electric motor  02 , is likewise connected, via a control line  18 , to the drive converter  04 . The drive converter  04  contains a control element, which is not specifically shown. 
   In the case of a voltage loss of the operating network  11  depicted in  FIG. 1 , the electronic switches  07 ;  13  switch over from the operating network  11  to the external power supply  17  in an uninterrupted fashion. As a result, the electric motor  02  is supplied, through the drive converter  04  and the line  03 , with enough differential energy E D , such as, for example with, 15 kWs, for the rotating component  01  to receive a total process energy E P , such as, for example, 50 kWs, which total process energy is required for a correctly-positioned stopping of the rotating component. The total process energy is arrived at when the differential energy is added to the, for example, 35 kWs supplied from the rotation energy E R  of the folding apparatus  01 . 
   In accordance with a second preferred embodiment of the present invention, as depicted in  FIG. 2 , the correctly-positioned stopping of the rotating component  22 , such as, for example, a folding apparatus, driven in a shaftless manner by an electric motor  21 , is carried out by the use of an uninterruptible power supply  29 ,  31 , which is connected directly to a drive converter  23 . 
   The drive converter  23  is essentially comprised of a rectifier  24 , an intermediate DC element  26 , and a DC-AC converter  27 . The drive converter  23  is also associated with a generally conventional bleeder  28 , which is configured as a braking resistance, and a battery  31 , of, for example, 400 Volt, with an associated battery management  29 . 
   All of the sub-units  21 ,  26  to  28 ,  29 ,  31  are connected to a control element  33  by a control line  32 . 
   A separate power supply, as was depicted as the UPS network  17  in the first preferred embodiment shown in  FIG. 1 , can be omitted in this second preferred embodiment since the input and output elements  24 ;  27 , the rectifier  24  and the DC-AC converter  27 , which are respectively provided in the power supply  17  and in the drive converter  23 , can be used together. 
   Only the battery management  29 , and the battery  31 , with, for example, 15 kWs, temporarily take over for the former external uninterruptible power supply, i.e. are associated with the intermediate DC element  26  of the drive converter  23 . 
   In the case of a failure of the operating network  11  depicted in  FIG. 2 , the battery management  29  switches over to battery operation. The differential energy E D , of, for example, 15 kWs, which is thus obtained from the power supply  29 ,  31 , together with the rotation energy E R , of, for example, 35 kWs, of the folding apparatus  22 , is sufficient to supply the required process energy E P , of, for example, 50 kWs that is needed to accomplish the correctly-positioned stopping of the rotating component  22 . 
   The intermediate DC element  26  is connected by lines  36  to the bleeder  28 , as well as to the power supply  29 ,  31 . 
   While preferred embodiments of devices for the position-controlled stopping of rotating components with position-controlled drive mechanisms in the case of voltage loss in accordance with the present invention have been set forth fully and completely hereinabove, it will be apparent to one of skill in the art that various changes in, for example, the specific rotating component used, the type of web-fed rotary printing press, and the like, could be made without departing from the true spirit and scope of the present invention which is accordingly to be limited only by the appended claims.