FR2630719A1 - INSTALLATION FOR ACCELERATING A REPLACEMENT COIL FOR MACHINES WORKING BAND PRODUCTS SUCH AS ROTATIVES SUPPLIED BY COILS - Google Patents

Abstract

Installation characterized in that the sensor for measuring the peripheral speed of the replacement coil 3 supplies a differentiator 15 whose output is connected to the real value input of a comparator 16 whose setpoint input is connected to a setpoint sensor, the output of which is connected to the regulation installation 17, a current converter 19 being mounted in the current path of the regulator of the drive means and the actual value generator is connected to the calculation and memory unit 7.

Description

"Installation to accelerate a replacement coil

  for machines working on products in

  tape as reel-fed presses ".

  The invention relates to an installation for accelerating a reel, replacing it in

  reeling stations for products in the form of ban-

  of, feeding machines processing products in

  strip form, especially rotary presses.

  In the winding machines with

  coil, it is necessary to deter-

  undermine the moment of implementation of the phases of

  reel change and, in particular, the time required

  re to accelerate the replacement coil and change its speed from zero speed to tape speed. This time is predetermined deo

  fixed way in the control systems con-

  nude (DE-26 19 236). For the reasons set out above

  afterwards, however, the acceleration time must be as accurate as possible. For a time or duration

  too much acceleration, the replacement coil

  accelerated at the speed of the web of the press, made other rotations until the end of this period too large. This results in the risk that the sticking point prepared to ensure

  the bonding connection is detached from the coil and

  draws a bad bond or that this point is torn off before the reel change and that

  fault stick by hand. On the other hand, if the time

  really necessary celeration is greater than the expected time, the sticking phase following acceleration will start late so that the residue of the old roll ends completely before

  the collage is done, thus causing the collapse

  automatic lage. In any case, we must stop

  the machines and there is waste by staining.

  The advantage of a reeling installation is also knowing the moment of inertia of the replacement reel. According to EP-18,555, this moment is calculated from the measured time for acceleration of the replacement coil until

  that it is at the speed of scrolling of the band.

  The disadvantage is that we do not have the moment of inertia to create a regulated braking moment of the replacement coil in case it should

  brake to a standstill during the acceleration phase.

  ration. Thus, during the braking until the stop of a small coil, one brakes with a moment

  unnecessarily large braking force in the case of

  belt drive for the sticking point and in the case of a central drive, the cone bush is heavily loaded. In the

  first case, the sticking point may shift

  and cause bad bonding. In the second

  In this case, damage to the socket may

  Be it possible to continue printing operations at a reduced tape speed, or even to eliminate the reel, which results in an interruption of printing. The disadvantage is, moreover, that the acceleration of the replacement coil is done with a constant torque. In the case of a small replacement coil, the bonding tip is thus strongly stressed, which can lead to its lifting and the corresponding disadvantages

already mentioned.

  The present invention aims to create an installation to prevent gluing defects and reduce the amount of product spotted and times

stopping the machines.

  The present invention thus proposes to create an installation for accelerating a replacement reel in strip-shaped products reeling installations, comprising a controlled drive means for the replacement reel,

  a measuring value sensor for the periodic speed

  as well as a computing and memory unit which are powered by the sensors for measuring the peripheral speed and the speed of rotation of the replacement coil, as well as a sensor for measuring the speed of rotation of the the band as well

  , that of a regulatory facility followed by an orga-

  a rotational speed control device which cooperates with the adjustment member of the drive means for

  determine in good time the acceleration time of the bobbin

  no substitute and its moment of inertia and protect

the sticking point.

  For this purpose, the installation is characterized

  in that the sensor for measuring the peripheral speed

  replacement coil feeds a different

  annuitant whose output is connected to the actual value input of a comparator whose value entry

  setpoint is connected to a value sensor of

  sign and whose output is connected to the regulating installation, a current converter being mounted in the path of the current of the control element of the drive means and the real value generator

  is connected to the computing and memory unit.

  In this way, all replacement coils are accelerated regardless of their importance or moment of inertia, always with the same preselected tangential acceleration,

  kept constant. This makes it possible to calculate exact-

  the time (duration) of acceleration necessary for the replacement coil, at any time, using the running speed of the band in the processing machine, according to a very simple mathematical relationship. The acceleration time thus correctly determined makes it possible to optimally set the beginning of the acceleration of the replacement coil so as to prevent the accelerated coil from effecting

  unnecessary rotations until the moment of collage or

  re that the spool does not reach the speed of the tape too late and that the old spool is

  completely emptied before gluing.

  This avoids bad collages resulting in

  stains and machine part stops.

  The installation according to the invention makes it possible

  in addition to the beginning of the acceleration phase,

  the moment of inertia of the replacement coil.

  Thus, in the case of braking to a stop during the rise in speed, the braking moment is determined according to the moment of inertia. For a small spool and peripheral drive, the glue point is protected; in the case of the central drive, the sleeve is protected from the spool and the risk of failure to glue, stop the machine,

  reduced printing speed or bobbin removal

  born. The moment of inertia makes it possible to determine also simply the mass of the coil and this quantity is available for example to detect the parameters of

  operation of the processing machine.

  Finally, the acceleration of all replacement coils to the same tangential acceleration, offers the advantage that for small coils, the bonding tip is not exposed to significant inertia forces, which excludes the risk of lifting. The present invention will be described hereinafter in more detail with the aid of an example of

  schematically represented in the drawings.

  in which: - Figure 1 shows an installation with a belt drive, - Figure 2 shows an installation with

a central training.

  The throttle device shown in FIG. 1 consists of a two-armed bobbin holder 1 carrying the old empty bobbin or bobbin 2 and the new bobbin or replacement bobbin 3. The bobbin 4 unwinds from the old coil 2 and feeds the processing machine, for example a printing machine. The strip thus drives a tape master roll 5 and a tape pulse generator 6; the latter is connected to a computing and memory unit 7. Each arm of the frame i carries a rotation pulse generator 8, 9 which provides a

  pulse for each rotation of the coil. A community

  controller 10 respectively links the pulse generator

  rotation associated with the replacement coil, i.e. the pulse generator 8 according to the

  drawing to the calculating and memory unit.

  driving belt 11 is applied against the replacement spool 3; this belt drives an engine

  This motor is connected to a gener-

  13 and a peripheral pulse generator 14. While the peripheral pulse generator 14 is connected to the calculation and memory unit 7, the tachometer generator 13 supplies a

  differentiator 15 whose output is connected to the

  value of a comparator 16. The reference value input of the comparator 16 is connected to

  the computing and memory unit 7 and the output of the com-

  The controller is connected to a control system 17. This control system is followed by a rotation speed regulator 18 whose output

  is connected to the DC motor 12 which constitutes

  kills the regulator. The current circuit of

  motor 12 includes a power converter

  19 that is connected through a converts

  intensity / voltage at the computing and

  7. This last unit is connected to the installation

Regulation 17.

  For the rest of the description we will use

  the following elements: at tangential acceleration atBr tangential deceleration D diameter of the replacement coil f function IM armature current of the acceleration motor Jz inertia of the central drive JG inertia of the belt drive JK inertia of the bearings of the coil (cones) JR inertia of the replacement coil K1 ... K9 constants MAG motor moment of the belt drive MAZ motor moment of the central drive

  MBrG braking moment for braking the yard

  belt MBrz braking moment of central braking MR moment of friction of reel bearing MR0 moment of friction of belt drive m mass of replacement spool N peripheral path by pulse n speed of rotation of acceleration motor S length bandwidth pulse Tv time interval -ta duration of the acceleration VB band speed as seen peripheral speed ZB number of band pulses ZD number of rotation pulses Zu number of peripheral pulses

  X - winding speed of the acceleration motor.

  During a coil change phase not described in detail here, it is necessary to stick the beginning of the replacement bob 3 on the strip of material 4 unwound from the old coil 2 which is practically empty. For this purpose, the replacement coil 3 is accelerated by means of the DC motor 12 to change its peripheral speed from zero to the speed of the band vB. This is done by a constant tangential acceleration that is materialized by a

  voltage on the comparator 16.

  The setpoint is stored in the memory and calculation unit 7. It can also be another setpoint generator, such as a potentiometer which is connected to the calculation and memory unit. memory 7 and the comparator 16. The actual value of the tangential acceleration is obtained as an electrical voltage by differentiating the voltage supplied by the tachometer 13 as a function of time in

  the differentiator 15; this real value is

  The difference in actual value determined by the comparator gives a control variable supplied to the control system 17. The rotational speed controller 18 thus supplied controls the corresponding change in the speed of rotation of the current motor. continuous 12.

  As the increase in peripheral speed

  per unit of time is a linear relation since the tangential acceleration is constant, one obtains the necessary acceleration time ta of the replacement coil 3 according to the relation B ta (1) a at or t 1 v (2) a K. B having K = (3) 1 a

K1 is a constant.

  The speed VB of the band is calculated in the calculation and memory unit 7 from the number of band pulses ZB supplied by the band pulse generator 6 in a predetermined time interval Tv and the trajectory S of the band. the band pulse band according to equation ZB. S

- B T (4)

VB = T

  v The motor moment MAG supplied by the motor

  acceleration of the belt drive is given

  born by the following relation: 4 JR at 4 JK at M = M + J a.K + _R t + K t AG = MRG JG 'at' 2 2 2

D.K2 D. K2

K22 2MR

+2 R (5)

  D. K2 In this relation we have 2 v 2. n (6) Equation (5) gives the moment of inertia JR of the replacement coil 3:

2 2 2 2

MG. D 2 MRG 2D. K2G

= _ .. t JR 4 = a 4 to 4 MR M D

- R (7)

  K 2 at The motor moment MAG is a known function of the armature current IM of the DC motor 12, M f (IM)

AG M

  The value of the armature current IM is

  undermined by the current converter 19 to be

  transformed into a voltage by the inten-

  sity / voltage 20 to be applied to the unit of

calculation memory study 7.

  Using equation (8) and the following constants: K2-

K = - (9)

3 4

MRG K2

K = RG 2 (10)

K4 = 4

J. K2

JG '2

K - G 2 (11)

4

M

K (12)

6 2

K = J (13)

7 K

  we transform equation (7) to obtain

= 1 -K K5]

[1 M.K3 - K4 KD

J = [3 4 K. D 6a K7 (14) R at at

  Constants are fixed and linked in a way

  characteristic of reeling so that the function

  The armature current is fixed and the tangential acceleration is predetermined. The initial diameter D of the replacement coil 3 is determined during

  of the first rotation from the number of

  Zu initials provided by the pulse generator.

  between two ZD pulses from the general

  rotational pulse 8 and the peripheral path N by initial pulse according to the equation ZU. NOT

D = (15)

  This value is calculated by the calculation and memory unit 7. This makes it possible to calculate the

moment of inertia JR.

  At the same time, the mass m of the replacement coil is calculated according to the formula: ## EQU1 ## This mass can be used for example as process data of the processing machine.

  Having the moment of inertia JR, we can calculate

  the braking moment MBrG braking the yard-

  of the replacement coil using

  analogous way, the components acting to accelerate

  ration: 4 J atB M = M + J.a K + R tBr MBrG RG JG atBr K2 + 2 D. K2 4 JK. atBr 2 R (17) 1 5 2 atM- R

D2 DK

D.K 2

  In this formula, we give the tangential deceleration atBr. In the case of a sudden braking, the braking moment MBrG calculated by the calculation and memory unit 7 is applied in the form of a voltage to the regulation installation 17. The latter then cuts the regulation of accelerating the replacement coil 3 and controls the rotational speed regulator 18 so that the DC motor 12 working in four dials, generates the

braking moment.

  In the exemplary embodiment, the accelerator

  The replacement coil is supplied by a motor. The invention can also be used for example if the drive of the replacement coil

  is ensured from the main drive (motor)

  of the processing machine, for example

  intermediate of an electric clutch constituting the adjustment member. It must then be introduced into

  the unit of calculation and memory the corresponding function

  the torque to be transmitted by the clutch and the excitation current, as well as the modified constant K5 due to the integration of

  the clutch in the moment of inertia JG.

  Figure 2 shows an installation of access

  leration composed of a two-armed bobbin holder frame 21. This frame carries an old coil 22 (empty coil) and the replacement coil 23. The strip of material 24 is unwound from the old coil 22 and passes in particular on a steering roller 25 which carries a band 27 pulse generator connected individually

  of calculation and memory 26. A continuous current motor

  29 is connected to pin 28 of the replacement coil

  cement 23; a DC motor 31 is connected to the pin 30 of the old coil 22. Each arm of the

  coil holder 21 is provided with a generator of

  rotational pulses 32, 33 providing a pulse for each rotation of the coil. Switches 34, 35 make it possible to use each time the DC motor associated with the replacement coil and

  the rotary pulse generator. According to the

  2, the rotation pulse generator 32 is connected to the computing and memory unit 26 and the DC motor 29 is connected to the output of a rotational speed regulator 36. A roller 37

  rolls on the replacement spool 23 and a general

  A peripheral pulse generator 38 and a tachometer generator 39 connected to the computing and memory unit 26 are controlled by this roller. The generator

  tachometer feeds a differentiator 40. The

  of the latter is applied to the actual value input of a comparator 41 whose setpoint input is connected to the computing and memory unit 26 whose output is connected to a control installation 42 The output of this installation is applied to the rotational speed regulator 36. A current converter 43 is mounted in the path of the armature current of the DC motors 29, 31; this converter is itself connected to the unit of

  calculation and memory 26 by an intensive converter

  44. The computing and memory unit 26 is

  also connected to the control system 42.

  During the coil replacement phase, you have to stick the end of the tape of the

  replacement coil 23 on tape 24 of the old

  no coil 22 that ends. For this, it is necessary to

  the peripheral speed vude zero up to the running speed of the vB band for the replacement coil 23 by means of the DC motor 29. This is done with a constant tangential acceleration and which is materialized by a voltage on the comparator 41. As a reference quantity, the calculation and memory unit 26 contains the set value of the tangential acceleration at. The actual value of tangential acceleration is applied as value

  voltage, by differentiating the voltage of the generator

  tachometer 39 as a function of time in the differentiator 40; this value is supplied to the comparator 41. The setpoint deviation determined by this comparator gives a magnitude of

  setting for the regulating installation 42. The

  rotational speed limiter 36 thus fed leads a corresponding change in speed

  rotation of the DC motor 29.

  To determine the acceleration ta of the replacement coil 23, equation (2) is used as in the first embodiment.

14 2630719

  a K1 vB (2) In this equation K a (3) t1

K1 is a constant.

  Similarly, according to equation (4), the speed of the VB: Z.S band is calculated

ZB (4)

B T (4)

  v from the number of ZB band pulses provided by

  the band pulse generator 27 in an inter-

  predetermined time range Tv and the trajectory of the

S band by band pulse.

  For the moment engine MAz provided by the acceleration engine at the central drive, we use the following relation: 2 JR 'at 2 JZ + JK at M Az = D + Z KD + MR (18) From the equation (19) the

  moment of inertia JR of the coil winding coil

placement 23:

MAZ. MR. D

  JRZ - Ra (19) R 2 a Z - JK 2 at t The motor moment MAZ is a known function of the armature current IM of the DC motor 29: MAZ = f (IM) (20) The value of the current d induced IM is supplied by the current converter 43 and is converted into a voltage by the intensity / voltage converter 44 to be applied to the computing and memory unit 26. The equation (20) and the following constants: M

8 = 2 (21)

K = J (22)

  give the following equation from equation (19): r I M> R = [2 K8 g K (23) J = 2 KS at g

  The constants K8 and K9g are typically

  unwinding, so that the function of the armature current is fixed and the tangential acceleration is predetermined. The initial diameter D of the coil

  replacement 23 is calculated as for the installation

  belt acceleration, during the first rotation of the spool, using equation (15): Z. N

D = (15)

  from the number of peripheral pulses Zu provided by the peripheral pulse generator 38 between two pulses ZD of the rotational pulse generator 32 and the peripheral path N per peripheral pulse in the computing and memory unit 26. L unit 26 can thus calculate next

  equation (23) the moment of inertia JR.

  At the same time, the mass m of the replacement coil 23 is calculated using equation (16): 8 JR m - (16) D

  Having the moment of inertia JR one determines

  likewise the braking moment MBrz of the central braking of the replacement coil 23, using analogously the components serving for the acceleration: 2 JR atBr 2 (Jz + JK at MBr D + D MR; (24) BrZ DDR in this relationship, atBr tangential deceleration

is predetermined.

  In the case of stop braking, it is

  the braking moment MBrZ calculated by the unit 26

  in the form of a voltage at the control system

  42. The latter then cuts the acceleration regulation of the replacement coil 23 and controls the rotational speed regulator 36 so that the DC motor 29 operating on

  four dials, generates the braking moment.

  In the embodiments described below,

  above, the reel frame comprises two arms each time. However, the invention also applies

  to three-armed reel frames.

  In addition, using the invention can also feed the calculation unit and memory from analog measurement sensors. The measurement value sensor can also provide a sequence of pulses per rotation for the rotational speed

  of the replacement coil and, in this case,

  in formula (15) the ratio of the number of

  by rotation and pulses exploited as a coefficient. Similarly, to control the differentiator, one can use a digital sensor with interposition, if necessary, a digital / analog converter. The differentiating member and the computing and memory unit can also be connected to a measurement value sensor, common to the

  peripheral speed of the replacement coil.

  List of references: 1 Reel stand 2 Empty reel 3 Replacement reel 4 Tape Guide roll 6 Band pulse generator 7 Computing and memory unit 8 Rotating pulse generators

9 "

  Switch 11 Drive belt 12 DC motor 13 Tachogenerator 14 Initial pulse generator Differentiator 16 Comparator 17 Control arrangement 18 Speed controller 19 Current converter Current / voltage converter 21 Coil holder 22 Empty coil 23 Replacement Coil 24 Tape Roller 26 Compute and Memory Unit 27 Pulse Generator 28 Coil Pin 29 DC Motor Coil Pin 31 DC Motor 32 Rotation Pulse Generator

33 "

34 Switch

"

* 36 Cruise control 37 Coil 38 Pulse generator 39 Tachogenerator Differentiator 41 Comparator 42 Control unit 43 Current converter 44 Current / voltage converter at Tangential acceleration

atBr Tangential deceleration.

  D Replacement coil diameter f iM function Armature current of the acceleration motor Jz Moment of inertia of the central drive

  Jz Moment of Inertia of Courtship Training

ROIE

  JK Moment of inertia of the reel bearing (side

nes)

  JR Moment of inertia of the replacement coil

  is lying. K1 ... K9 Constants MAG Motor moment of the belt drive Mg Motor moment of the central drive MBrG Moment of braking for belt braking MBrz Braking moment for central braking MR Moment of friction of the reel bearing MRG Moment of friction of the belt drive. m Mass of the replacement coil

  N Peripheral Pulse Peripheral Path

  velocity n Acceleration motor rotation speed S Tv pulse path Tv Time interval ta Acceleration time VB Band speed seen Peripheral speed ZB Number of pulses of the Zu band Number of peripheral pulses Angular velocity of the acceleration engine

ZD Number of rotation pulses.

2630719-

Claims (1)

CLAIM   Installation to accelerate a replacement reel in the reeling facilities of a   produced in the form of a band using a means of   controlled dragging of the replacement coil (3),   of a value sensor for measuring the speed of   and a computing and memory unit (7, 26) which is powered by the measurement sensors   giving the peripheral speed and rotational speed   replacing the replacement coil (3) as well as a sensor for measuring the speed of the belt and a regulating device (17, 42) with a downstream speed or rotation controller connected to the device of   setting of the drive means   in that the sensor for measuring the speed   of the replacement coil (3, 23)   a differentiator (15, 40) whose output is connected to the actual value input of a comparator   (16, 41) whose nominal value input is re-   connected to a set-point sensor and the output of which is connected to the control system (17, 42), a current converter (19, 43) being mounted in the current path of the setting device of the means drive and the real value generator   is connected to the computing and memory unit (7, 26).