FR2501587A1 - DRIVE DEVICE FOR ROTARY MULTI-COLOR SHEET PRINTING MACHINES - Google Patents

Abstract

A. DRIVE DEVICE FOR ROTARY PRINTING MACHINES. B. CHARACTERIZED IN THAT ON EACH OF THE SHEET GUIDING CYLINDERS 4, 5 OF EACH PRINTING GROUP, IS DIRECTLY MOUNTED A CONSTANT CYLINDER HYDRAULIC MOTOR 7 WHICH CORRESPONDS, BY ITS SIZE OF CONSTRUCTION, TO THE TORQUE REQUIREMENTS OF THE GROUP D '' INDIVIDUAL PRINTING PLUS AN ADDITIONAL TORQUE REQUIREMENT FOR THE DEVICE OF THE TEETH PROFILES OF THE GEAR TRAIN AND WHICH IS DESIGNED AS A RADIAL PISTON ACHIEVEMENT WITH SEVERAL PISTONS WITH AN INPUT AND OUTPUT DISTRIBUTION 19 ASSOCIATED WITH EACH PISTON RADIAL AND SHOWING A "POSITIVE OVERLAP". C. THE INVENTION APPLIES TO PRINTING MACHINES WITH MULTIPLE COLORS.

Description

The invention relates to a training device

  for rotary sheet printing machines in several colors, comprising several printing units

mounted in series.

  DD 90799 discloses a device

  for printing machines in which the di-

  to separate printing units of the printing machine

  are connected to each other by a gear train.

  Hydraulic motors are associated, in order to obtain

  a gradation of the torques, reducing valves

  flow regulating valves and a control unit for carrying out variants of operation.

  Such a device has the disadvantage

  that the known training variant using the

  hydraulic units with upstream mounted valves

  a technically complicated variant which is costly from the economic point of view and which, moreover, can not be used for all types of operation, in particular for

  range of rotation speed adjustment from 1 s to 100

  stop on printing machines, in the slow walking zone at 1.5 rpm to the operating speed; and also, it does not meet the requirement to have a regular high torque with constant speed in order to

  to guarantee a good quality of printing.

  On the other hand, when

  the operating variant in step-by-step

  by pulses), it is not possible to obtain a

start smoothly.

  The object of the invention is to obtain a drive device for rotary sheet printing machines in several colors, which makes it possible to ensure

  high print quality, also by

  appropriate for the system and very low excitation of

  brations, as well as the ability to perform all types of operation with a very low expense at points

technical and economic point of view.

  The object of the invention is therefore to provide a

  Positive drive that meets the special requirements of the machine to print constant high torque,

  very wide range of speed control,

  extremely low continuous speeds, constant speed

  requiring only a very low technical expense.

  The invention relates, for this purpose, to a drive device characterized in that on each

  sheet-guiding cylinders of each printing group.

  a hydraulic motor with a constant displacement which corresponds, by its size of construction, to the need for torque of the individual printing unit more

  additional torque need for the device

  gear teeth of the gear train and which is designed under

  radial piston embodiment comprising several pistons

  tones with an input and output distribution associated with

  each radial piston and having a "positive recovery".

  The "positive recovery" of the inlet and outlet distributions of the constant displacement hydraulic motors which is then provided is greater than 0.3 mm. In the supply duct to the dispensing valve provided for the particular operation and belonging to the 'control unit, is provided a throttling

  to dampen the kick-start and, in the flow duct,

  starting from this valve distributing function-

  Specifically, a flow control valve is mounted to provide a constant rotational speed in the slow running operation variant, regardless of variatons of the machine's rotational torques. The passage sections of the throttle and the flow control valve are adapted to each other; the passage section

  the throttle is greater than that of the valve

flow gulatrice.

  The invention will be better understood using

  the following description and the attached drawings represent-

  as an exemplary embodiment of the invention, drawings in which:

  FIG. 1 is a view (in FIG.

  schematic diagram) of the printing machine;

  - Figure 2 shows a diagram of

  of hydraulic motors with schematic drawing

tick;

  - Figure 3 shows a form of reali-

hydraulic motor assembly;

  Figure 4 shows the schematic

  than that provided for the operation of the device comprising

  throttling and flow control valve.

  FIG. 1 shows a rotating machine for printing sheets in several colors, in series assembly with a sheet feeder device 1, several

  printing groups 2 and a sheet catcher.

  the printing press is transported by means of the sheet guide rolls arranged in the embodiment in print rolls 4 and transfer drums through the rotary printing machine. The sheet guide rolls are connected to each other by means of a gear train 6. To each of the guide rolls

  of a printing group, is associated directly, without

  of transmission mechanisms, a hydraulic motor

  than at constant displacement 7, in one embodiment

  radial piston with multiple pistons.

  The hydraulic motors 7 of all the printing cylinders are connected in parallel. The rotational torques of these constant displacement motors are adapted to the power required for the various printing units 2 and to the excess of torques required for the device.

  tooth profiles that the gear train contains. The syn-

  printing group 2 - that is, the

  positive gear tooth profile 6 which is

  necessary to obtain a good quality of printing-

  is achieved thanks to the gear train 6 and the concordance

  torque of the constant displacement hydraulic motors as-

printing groups.

  It is irrelevant whether for printing groups, printing groups with three

  cylinders or five-cylinder.

  Upstream of all the hydraulic motors connected in parallel are arranged: a control unit 8, a hydraulic generator 9 and an electric motor 10.

  Rotational speed of this motor 10 is constant.

  The different speeds of the machine are obtained by means of a mechanical adjustment of the generator

hydraulic 9.

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  The control unit 8 comprises a dispensing valve 21 serving for the main operation in order to

  to make the variants of this main func-

  corresponding to the advance and stop, as well as a distributing valve. 22 for the particular operation to realize the variants of this particular operation

  corresponding to slow walking forward and backward,

step by step and stop.

  Such control units with

  vending machines are generally known and,

  therefore, do not require further explanation.

  In the duct 12 'supplying the valve 22 is provided a throttling 17 for the purpose of damping the starter. In the flow conduit 13 'from this valve 22 is mounted a flow control valve 18

  in order to ensure a constant speed irrespective of

  rotational torque of the machine.

  The hydraulic generator 9 is connected to a container 20, in which the conduit also opens

  flow 13 of the overall system.

  The usual hydraulic motors in 1 '

  industry, do not make it possible to

  tion, extremely low for hydraulic motors,

  born at the slow march of the printing machine (about 1.5 turns / m * rn of the printing cylinders). For this reason, the engine

  radial piston which is used is equipped with a

  input and output 19- for each piston which has a "positive overlap". Figure 3 shows this "recovery

  positive "of the corresponding input and output distribution

  example of a piston control. Other forms of

  distribution that may be used, for example distribution

  bution with rotating drawers, can also be equipped

a "positive recovery".

  Under the term "positive recovery" of the 4dstribution intended for the radial piston hydraulic motor, it should be understood that, in the intake and exhaust reversing phase, and conversely, the circulation current of the the pump is interrupted for a short time, that is to say that, during a short interval, in the 4o reverse phase, there is no connection between the chamber 11 of the piston of the piston engine radial and the duct

  13, ii between the piston chamber 11 and the

  For this purpose, the control piston 14 is constituted in such a way that the dimension b of the annular groove 15 of this piston is smaller than the dimension a of the bore 16 of the piston (distance between conduit 'feed

  12 and flow conduit 13 attached to the bore 16 of the piston

your command tone).

  In order to achieve rotation speeds

  low end, mentioned above, the size of the "recou-

  positive ("a-b), for adjustment tolerances u-

  for the control piston 14 and the bore 16 of the piston

  your (slit width), is of at Smins 0.3 mm.

  The combination of all the characteristics

  mentioned, for the first time, it is practically possible to produce a drive device for printing machines with hydraulic motors without major expense.

  while ensuring all the functional variants

  and good print quality.

  The operating mode of the drive device is described below: Starting the electric motor 10 produces, by means of the hydraulic generator 9 connected to the

  container 20, a stream of pressurized oil, which is

  progressively through the intermediary of the internal adjustment device. This pressurized oil stream, in

  the case of the main operating variants, is

  passing through the supply duct 12 and the distribution valve

  21 for the main operation of the unit

  8 - with constant displacement hydraulic motors

  7, which each actuate a guide cylinder of

  sheets (4, 5) of a printing unit 2. By means of

  of the flow conduit 13, the oil flow of re. t

turn is returned to the container 20.

  Due to the gradation of the couples between the motors 7, it is supplied to each printing group 2 only the fraction of power which is necessary.

  for this printing group and which in addition ensures the function-

  of the gear profile of the gear wheels of the train

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  6. Also, it is not necessary to provide

  a synchronization of the rotational speeds of the hy-

Hydraulics 7.

  The inlet and outlet distribution 19 provided for each piston of the constant displacement hydraulic motor-consisting of a control piston 14 guided in a bore 16 and displaced in a known manner by the engine to

  radial pistons- provides assurance that each piston chamber

  your engine 11 is connected, at the exact moment, with the

  supply 12 (working phase) and then to the duct

  flow 13 (non-working phase).

  In the reverse phase, for

  from the supply to the evacuation flow, and reciprocal-

  The piston ring 11 is separated from the supply as well as from the flow ("positive overlap"). With this "positive overlap" of a determined minimum dimension value, with adjustment tolerances (slot widths)

  conventional for piston 14 and bore 16, this result is obtained.

  that the hydraulic motor rotational speed zone is extremely offset downwards, so that the hydraulic motor can be used for the first time for printing machine drives

  achieve what is called slow walking.

  Through the constriction 17 formed in the supply duct 12 'leading to the dispensing valve 22, the pressurized oil flow, when the dispensing valve 21 provided for the main operation.

  closed, is influenced in such a way by a

  determined section of the section of passage, that with this section determined the current of passage is modified under the effectrde the pressure difference produced at the place

of the strangulation.

When the hydraulic motors to

  constant displacement move from standstill to

  As a result, due to the pressure difference which is modified at the location of the throttle 17, a differentiated oil flow is produced which is dimensioned, by the determined passage section of the throttle 17, to a predetermined value. such,

  that the hydraulic motors 7 are accelerated by

  4o continued and practically smooth.

  This gives the result that, in the case of the operating variant in stepwise mode (pulsed operation), there is no movement pattern affected by jolts by sudden switching on of the current. 'oil.

  As soon as the regulating valve of

  bit 18, inserted in the flow conduit 13 'from the dispensing valve 22, is traversed by the flow of oil flowing from the hydraulic motors 7, this valve,

  when entering into action, adjust their speed on the value

  necessary aunt (about 1.5 rpm). At the same time, he

  throttling 17 becomes ineffective.

  The throttle 17 is adapted, by its passage section, to the flow regulating valve 18 in such a way that it can only act at the start-up time, when no oil current is still passing through this valve 18 , which is to say that the constriction has a larger cross-section than the valve

flow regulator 18.

  With this valve 18 which is mounted

  in the flow conduit 13 'from the valve dis-

  22, which becomes active in the slow-running type of operation, the established oil flow is kept constant, irrespective of the variations in the torques.

  machine rotation; as a result, we obtain for this vari-

  te of operation, a constant rotation speed of

hydraulic motors 7.

  In the case of other types of

  the throttle 17 and the throttle valve 1 $

are without action.

Claims (3)

  1- Machine training device   multi-color sheet printing presses, operating with a plurality of series-connected printing units connected by a gear train, consisting of an electric motor, a hydraulic generator, a control unit comprising a distributing valve for the main operation and a distributing valve for particular operation, and a plurality of parallel hydraulic motors, characterized in that on each of the sheet guide rolls (4, 5) of each printing unit ( 2) is directly mounted a constant displacement hydraulic motor (7) which corresponds, by its size of construction, to the torque requirement of the individual printing unit plus additional torque requirement for the device of the tooth profiles of the train of gears and which is designed as a radial piston embodiment comprising a plurality of pistons with an input distribution   and outlet (19) associated with each radial piston and both a "positive recovery".   2- Drive device according to   claim 1, characterized in that the covering   the input and output distribution (19) of the engines   hydraulic cylinders (7) is greater than 0.3 mm.   3- Training device according to the claim   1, characterized in that in the flow conduit (13 ') extending from the dispensing valve (22) provided for the particular operation and belonging to the control unit (8), a flow control valve is mounted (18) for assute   a constant speed of rotation in the operating variant   in operation, irrespective of machine torque variations, and in the supply line (12 ') leading to the specially arranged distributor valve (22) belonging to the control unit ( 8)   a choke (17) with a larger   the flow control valve (18) for cushion the jolt of start.