DE1561703A1 - Automatic cutting device - Google Patents

Description

KHBM

BELOIT CORPORATION, 1, St Lawrence Avenue, Beloit, Wisconsin,

V.Sft.v.Ä.

Automatic cutting device -

The invention relates to a cutting device for sheet film materials or the like, and in particular a device, by means of a paper web or the like removed from a supply roll into two or more narrower webs is divided, which can then be wound onto separate rolls. The device according to the invention performs a great deal Number of steps that were previously only manual.

The known winding devices for unwinding, cutting and rewinding a tissue - z * B. Paper web work in a certain way, whereby only one large roll is clamped into the device »unwound and one οάβί» is divided into several smaller rolls. The real one

, The shear effect causes several anti- BAD ORIGINAL

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ingeniously rotating leaves. The cutting device must each have a different structure according to the individual customer requirements and the properties of the tissue to be cut. Part of the time available must therefore be used for the unproductive work steps, such as changing the large rolls, adapting the settings of the cutting tools to customer requirements, exchanging the winding cores for the roller conveyors and for a lot of other things to name and request the narrower rolls required work steps are used. > -

A considerably simplified actuatable winding and cutting device is described in US Pat. No. 376 56 * 6, according to which the manual adjustment of the cutting tools is replaced by a precision adjustment device. Although the set-up and operating times are considerably reduced, the time savings achieved do not represent a possible minimum, since an operator must pay attention to a table or the like provided with the individual steps in order to determine the position of the cutting tools for subsequent work steps to be determined. Another time period occurs because the operator of the winding device has to manually label the rolls with transport, storage information and other relevant data. Further problems are those of the optimal determination of the sequence in which the roll is to be divided up and that of the bestiaemi of the pattern "or the arrangement of the cutting tools""£ e in" iner

Cross machine direction to be used when cutting. Originally this operation took place exclusively manually, with an operator entrusted with the task of “defining the cutting process so that minimal sennitt losses were achieved. The loss of cut is that part of the great roles that are involved in dividing them up accrues as unusable waste according to customer requirements.

The above recorded procedure is time consuming and does not usually result in a minimal marker Cutting losses.

The present invention has for its object to be a to create a digital or large-scalar analog computer that can automatically adjust one or more cutting tools are used and to create a facility that is used to Identification of the finished rolls with information e.g. Order, transport or storage data is suitable.

Further features and advantages of the object according to the invention can be seen from the figures and the following description of these figures.

1 shows an exemplary embodiment in a block diagram according to the invention, wherein a cutting device is provided with a digital control.

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Fig. 2 shows a block diagram of a further embodiment according to the invention, with an analog Information to control the cutting device is used.

Fig. 3 shows a block diagram of a further embodiment according to the invention.

In the same representation, FIG. K shows a relatively simple exemplary embodiment according to the invention.

F, ig. 5 shows in a block diagram the simplest exemplary embodiment of an automatic control of a Cutting device and

¹ Xg. 6 shows in a circuit diagram devices according to the invention for barking the cutting device.

1 shows an arrangement according to the invention for the automatic adjustment of the cutting tools for marking the rolls and for receiving the rolls in the cutting device. A digital computer 11 is used here for selection heritable νώη Iriformationen that these have been supplied via a plurality of punched cards 12, wherein the information was again taken job sheets 13 and fed into the hole cards 12. The order sheets 13 contain the customer's name, the desired dimensions of the role provided and the other relevant data. This information must be implemented in corresponding information units in

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a suitable medium, such as the punch cards 12, can be stored, the other interpolation of this information through the computer 11 enable.

After the information has been selected and read from the punch cards 12, the computer 11 feeds digital output signals via a line 16 into a display device and control panel lh . Line printers, oscilloscopes or rows of lamps arranged on the control console can serve as the display device; —4 The display device Ik can be used to display the position of each cutting tool for a subsequent cutting process, to recognize the customer's name and / or the quality of the cut paper. The display device lh may correspond to the usual digitally operated display device. Selector switches l * + a and I ^ b are arranged on the control panel, with switch l4a numbered from 1 to the number of cutting devices and switch l * + b from 1 to 3 . The switch 14b is used to control the mode of operation of the display device. In a preferred embodiment according to the invention, the distance of the cutting tool from the web edge or from any other starting point of each cutting tool is indicated by selecting the special cutting tool number using the switch I ** a. The second position of the switch I! + B can be used, for example, when selecting a specific number on the switch I ¹ Fa to set the web width. The third position of the switch l ^ b can be used to indicate

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the cutting losses, with the percentage cutting loss of each pattern being shown if necessary. The switch lHa can also be put out of operation or to select different displays, such as. the losses in cm _t ton percentages, the loss in currency units, etc., are used. The control console lh also contains switches 1 * + ο, which are used to store additional information in the computer 11 that cannot be removed from the punch cards 12. With this manually fed information, the computer 11 is reset to its initial state. This information can contain, for example, changes in the available step width which can be attributed to a reduced Fourdrinier wire thickness or a reduced paper thickness or the like. These and other factors which lead to a reduction in the usable proportion of paper are used for integration with the information taken from the punch cards 12 via a line Y? the receiver 11 is supplied.

A manual input station 18 is coupled to the computer 11 via a line and is used for manual input of information, e.g. storage capacity data in the sequencer 11.

Information such as order data, transport data and customer code numbers are through the punch cards 12 in fed into the computer 11 and via a line 21 one Characteristic line 20 supplied. Beyond that

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Storage data from the input station 18 via the computer 11 led to labeling device 20 * The labeling device 20 prints a label or prints immediately on the paper web, all of the data that envelops are required for further handling of the role. the The label will be sent to the warehouse before the roll is transported applied to the roll, e.g. glued on.

Command signals from computer 11 are fed via a line 23 to a cutting tool control 22 »The cutting tool control 22 derives from digital command signals

appropriate control information used to control the operation of a plurality of cutting tool motors 2h . The control signal information from the cutting tool controller 22 'is fed ^{into the motors 2 1 + via a line 26.} A return information indicating the actual position of the cutting tools is fed via a line 27 from the motors 2 * f to the cutting tool control 22. The motors 2k can be coupled to one or more positively working devices, by means of which a return signal corresponding to the actual cutting tool position is generated in a known manner.

The cutter controller 22 also becomes suitable Contain devices that the return signal corresponding to the actual position in a corresponding convert digital signal information, which in turn uses ■ a line 28 is fed back to the computer 11.

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A manual input control 29 is coupled to the cutting tool control 22 and operates the cutting tool control 22 via a line 30. The input control 29 can serve to override one or all of the command signals that are fed into the cutting tool control 22 by the computer 11. The distance between the web to be cut, for example paper web, and the corresponding cutting tool blade is controlled by a manual input control 31, which feeds signal information to the cutting tool control 22 via a line 32, such that the distance between the web to be cut and the corresponding cutting tool blade in Steps of 2.5 ¹ + x 10 "cm ßsteuerbar. In operation, all punch cards 12, each containing a specific customer order,

introduced

into the computer IV, all cards being evaluated at the same time will be. The information on cards 12 is stored in fed into a runtime memory. A piece of information indicating the available width of the rolls to be divided into smaller rolls Contains parent roll, is also introduced into the computer 11. The stored information of the punch cards 12 are then evaluated that the combination of the order data is selected that results in the least possible loss of cutting leads.

This is shown in the following using a parent roll, the width of which is 305 cm.

Four punch cards 12, in the four different con * den orders for rolls with webs of different widths

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are stored «have been fed into the computer 11. The computer 11 then evaluates the various combinations of web widths that are desired by customers and selects the combination of orders which results in minimal cutting losses when the master roll is cut up. The four web width are 61 cm, 76.2 s, 91, ¹ I cm and 182.8 cm. Only a combination of these data leads to a maximum utilization of the 305 cm wide maternal role. The combination of the lanes with 61 cm, 76.2 cm and 91t ¹ * om results in a

cm of samtbreite of 228.6 so that when a parent roll / 305 cm a residue of 76 cm h remains, which may optionally be used for another order 1st.Die combination of webs with a width of 76.2 cm, 91 ' ¹ + cm and 182.8 cm results in a total width of 35O, H cm, which exceeds the total available width of the parent roll. On the other hand, the combination of the lengths of 182.8 cm and 91.V cm results in a usable width of 27 ^, 2 cm, with a remaining length of only 30.5 cm.

There are therefore the application for the 91st ¹ ^ and 182.8 cm

broad roles corresponding digital information from Computer 11 led to the cutting tool control 22, the in turn controls the corresponding cutting tools in the required positions. The cutting tools that come with a combination is not required to split the parent role are «are transported to a distant place, in such a way that they do not interfere with the operation of the cutting tools used for dividing the parent roll. So it can

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a web transport cutting device with six or more cutting tools can be provided, in which case, for example, only three cutting tools are required in the case shown above in order to cut the master roll into sheets of 91, k cm and 182.8 cm wide. However, a fourth cutting tool can be provided for you to prepare the unused remaining part of the roll, the width of which is 30.5 cn.

FIG. 2 shows an arrangement which is suitable for automatic adjustment of the cutting tools and which is provided with an external analog comparator. Several punched cards k2 provided with information, for example order data or the like, are introduced into a computer * t1, the information from the punched cards initially being taken from order sheets ** 3 and stored in the punched cards k2. The computer kl is coupled to a selection device kk which is used to actuate one of several first holders 50 to 55 and a corresponding switch of several second switches 57 to 62. A switch k9 has a contact k6 which is connected to At of the warning device kk. When the switch ^ 9 contacts the contact k6 , the switches 50 to 55 and 57 to 62 are coupled to the selection device Mt. Another contact 48 of the switch * + 9 is coupled to a manual selection device k7. When the switch ^ 9 is in operation, the switches 50 to 55 and the switches 57 to 62 can be operated either automatically by the computer kl or manually by the selection device k7. Digital information from the computer 4l is transmitted via a line 6k

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a digital-to-analog converter 63 is supplied. This converter transmits the "digital information for use in an analog summing amplifier 66 in an analogous form. A signal information corresponding to a desired position of a cutting tool is fed to the converter 66 via a line 68 when a selector switch 69 makes contact with a contact 70 .'A signal information which corresponds to a desired position of the cutting tool is supplied to the digital-to-analog converter 63 as a direct voltage. the value of which is from 0 to 50 volts "and fed via a line 71 to the contact 70. A 1 + * θ- 50 volt voltage source is connected via a potentiometer 72 to a contact 73 ', whereby the manual adjustment of the cutting tools When one of the switches 50 to 55 is in the closed position, a signal information corresponding to the actual position of the particular cutting tool is fed via a line 7.6 into the summing amplifier 66. The summing amplifier 66 then compares the signal information fed in via the lines 68 and 76 with one another and generates an output signal corresponding to the difference or the error between the actual and the desired position of the cutting tool. Line 75 returned to the computer hl .

The error taken from the output of the summing amplifier 66

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Teaching signal information is also fed via one of the switches 57 to 62, the associated cutting tool of which is to be set, to a specific one of several power amplifiers 79 to 8k in order to control a cutting tool drive motor 86 coupled to this amplifier. In operation, the Xundenaufträge are holed in the above described manner in the card and then 6k2 + l is fed into the calculator *. In the case of automatic operation, the switch h9 comes into engagement with the deadline contact * + 6, the selection device Mt actuating one of the switches up to 55 and one of the switches 57 to 62 in each case. By closing the switches 50 and 57 , for example, a signal corresponding to the actual position of the first cutting tool is generated, which reaches the summing amplifier 66 via the line 76 and sends an error signal to the amplifier 79 via the closed switch 57. The amplifier # 9 then controls the associated cutting tool drive motor 86 together with the corresponding cutting tool until the desired position entered into the computer is adjusted by the return signal of the conductor 76. At this point in time, the signal information from the summing amplifier is zero. The output signal taken from the amplifier 66, the value zero, is then fed via the analog-to-digital converter 67 and via the line 75 into the computer * + 1, whereby a suitable shift signal is generated that opens the switches 50 and 57 and to the Setting the second cutting tool closes switches 51 and 58. Before generation

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such an overshoot signal is made by pressing 'a cutting path against a corresponding cutting tool a-att Serving signal created. The setting of the second and the following cutting tools are carried out in the same way.

In manual operation, the selector switch k9 is brought into connection with the contact k8 , and manual devices can be provided to control the switches 50 and 57.51 and 58, 52 and 59, which are assigned to one another. 53 and $ 0 _% 5k and 6l, 55 and 62 optionally to excite. Even in manual operation, the selector switch 59 can be brought into engagement with the contact 73 and an analog signal corresponding to a cutting tool division can be fed to the summing amplifier 66 by changing the position of the potentiometer 72. In addition, a device 85 is provided which sends a signal to the computer HI when a cutting tool position overlaps the position of an adjacent cutting tool. One arranged on the computer Hl. Console can serve to display such an overlap and to display information such as is created by the display device 1H according to FIG.

Fig. 3 shows a simplified embodiment of a automatic cutting tool adjustment all comparison signals are generated in the computer itself. Here, several punch cards 892 are placed in a computer 91 introduced into the order or Trim data can be saved. A return

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Information which indicates the actual position of the individual cutting tools is fed to an analog-digital converter 9k via several lines 96 to 101. Each of the lines 96 to 101 can be provided with suitable selection devices in order to selectively and specifically in each case lead one piece of signal information to the analog-to-digital converter 9k at a specific point in time. The analog-digital converter Sh can, however, itself be provided with selection devices, so that external selection devices are unnecessary.

The output signal of the ^analog-D igital converter 9 ** is χ via lines supplied ο2 to 107 the digital computer 91st The lines 102 to 107 are each assigned to cutting tools}. The signal information corresponding to the position of a cutting tool can be selected individually and compared with the desired position of this cutting tool, an error signal being generated in the computer 91 in the event of any deviations. This error signal corresponding to the new cutting tool division is then fed to each of the cutting tools from the computer 91 via lines 108 to 113.

The computer 91 is via a line 11 * + with a die Order of control of the setting of the cutting tools interrupting device provided, the-between adjacent Overlaps occurring with cutting tools indicates

FIG. H shows a simplified representation

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Another example of an embodiment of an automatic one according to the invention Adjustment device for cutting tools.

In this case, the punch cards are fed into a digital computer 121 122 information taken from the punch cards have been supplied via order sheets 123. To the generation digital signal information »that correspond to the actual positions of the cutting tools are the cutting tools each provided with suitable feedback devices. The return signals taken from these facilities can of a shaft driven by a gear shaft position encoder before digital Adjustment transducers (position transducers) can be removed, which are each coupled to a cutting tool. The received digital signal information is transmitted over several lines 126 to 131 fed to the computer 121. The actual positions of the in the form of digital signal information vcELecondary return signals make it possible to dispense with Analog-to-digital converter, as shown in FIG. 3. The computer 121 compares the desired position of each cutting tool with its actual position and generates an error signal at its output, which is transmitted via Leitunffti 132 to 137 is output to one of the controls used to control the cutting tool settings. Depending on the digital signals on lines 132-137, the cutting tools can be operated by stepping motors be controlled, and / or by clutch control that of

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are dependent on the digital signals. I _n other are provided, the already above-indicated means for feeding Signalinformfctionen dne over line 138 to the computer 121, which come into operative connection with Auftretei of overlapping of the settings of the cutting tools.

FIG. 5 shows a further simplified exemplary embodiment of an automatic cutting tool setting device. A digital computer 1 ^ 1 is fed with punch cards Ik2 into which order data 1 ^ 3 extracted have been fed. The output signal of the computer 1 * + 1 is fed to the corresponding cutting tool setting controls via lines ikG - 151 in order to control the position of the cutting tools coupled to the individual lines.

In this simplified embodiment according to the invention, no return information is required to indicate the actual positions of the cutting tools. Indeed, the movement of the cutting tools is controlled by stepping motors coupled to the cutting tools. The movement of each cutting tool begins at a certain reference point, with the computer I ¹ +! only ensures that the number of pulses supplied to each of the stepper motors is maintained. The computer can have several manually operable inputs, such as a selectable index input 152, an input used to set the cutting tool contact pressure, and an input

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have, which is used to switch off the cutting tool. The index input selects 1 ^ 2 for all cutting tools the starting position so that the computer llf-l ^ the movement holding cutting tools upright relative to a starting position. The one for setting the mold contact pressure Serving input - regulates the relative position between the cutting tool blade and the rolls to be cut only in Steps of 2.5% χ 10 cm. The one to switch off the cutting tool The serving input conveys any cutting tool that is not in use to a rest position, thereby causing an impairment operation of the cutting tool is avoided.

Fig. 6 shows a further embodiment of a device for the automatic adjustment of the cutting tools to a device coupled to this device for controlling the cutting tool eyes in a position remote from a working position, which is shown in US Pat. No. 3-17-6 566 Control device is similar. A digital computer 161 can be fed with several punch cards 162 into which the order data taken from order sheets I63 have been fed. Two digital stepping motors 16k and 166 are coupled to outputs of the digital computer 161. The motors I6 ¹ +, I66 are provided with shafts I67 and I68, the angular positions of which correspond to the output signals of the computer Ιοί. Wave 16? drives an encoder generator I69, which is connected to a control transmitter I70, which has an output corresponding to the position of I67

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Ver-The output of the control converter 170 is connected to an amplifier 171, which leads a return signal to an analog-digital converter 17h via lines 172-173. The analog information of the amplifier 17I is converted into digital information and fed into the digital computer Ιοί. The ^output Output of the amplifier I7I controls the position of a strip to be cut.

Similarly, the shaft I68 is the engine I66 with coupled to a transmitter generator 177, which outputs an output signal which is carried by a control transformer I80 to an amplifier 179 evokes. The amplifier 179 is via leads

180 - 181 are connected to the analog-to-digital converter Y? K , via which a return signal is sent to the computer I6I. The output signal of the amplifier 179 controls the position of the cutting tool as a function of signals that are sent from the computer to the motor I66.

"As described in US Patent 3,176,566, the cutting tool blade and the tape to be cut carried by separate support members. These support elements are slidable on guides, e.g. Rails attached to the for setting the cutting tool blade and the to cutting tape in the direction of the crosshairs. Of course other settings can also be selected.

An adjustment motor 182 (see Fig. $) Is mounted on the carrier element that carries the tape , while the

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The carrier element carrying the mold sheet is an adjusting motor 183. “The engines I82 and I83 are over Switch 18If as. Or lift; b with input terminals 186.'or. connected, which are coupled to a power source. During the adjustment of the tape to be cut and the cutting tool blade are the switches 18 ^ a and 18 ^ b to achieve constant operation of the adjusting motors 182, 183 closed.

A shaft of the motor l82 is via a gearbox as well Forward and reverse clutches I88 and I89 with one drive wheel in operative connection, which in turn is connected to a rack (rastk) connected to the corresponding guide is engaged · When operating one of the two clutches 188, I89, the shaft of the motor 182 passes through the gearbox with the rack and the drive wheel in power Connection so that the tape to be cut along the Leadership is moved. The adjustment screw I83 of the cutting tool blade is similar about a gearbox as well Forward and reverse clutches 190 and 191, respectively, with a drive wheel in a positive connection, which is connected to a Rack is engaged, which is mounted on the guide carrying the sheet.

The clutches 188 and I89 are through the amplifier I7I excitable, which is connected to an output of the control transmitter I70 connected is. In the same way are the couplings I90, 191 coupled to the output of amplifier 179, whose

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Output signal proportional to the output signal of the control transmitter 178 is. A rotor 192 of the control transmitter I7o and a rotor 193 of the control transmitter 173 are each connected to drive wheels, with the output signals of the respective transducers I70 and I78 so reduced until an output signal of the value zero is reached and the excitation of the corresponding clutches 188 - 1891 has subsided.

During operation, the motor I6 ¹ + is driven as a function of signals from the computer I6I in such a way that a rotor 19 ¹ + of the generator I69 is controlled into an angular position corresponding to these signals. The angular deflection of the rotor 19 ^ generates an output signal at the control transmitter I70 which is proportional to the ^{displacement of the rotor 19 1 +.} This output signal is amplified and is used to control the excitation of the clutches I88, I89. As a result of the excitation of the clutches 188, I89, the carrier element is displaced along the guide, the angular position of the rotor 192 of the control transmitter I70 being changed at the same time. If the rotor 192 is rotated by an angular amount which ^{corresponds to that of the rotor 19 1} +, then the output signal of the control transmitter 170 drops to the value zero. The setting of the tape to be cut on the guide therefore takes place as a function of output signals that are fed from the computer Ιοί to the stepping motor l6 * f.

By operating the stepper motor I66, the 0098U / 02B6 - ²¹ "

Adjustment of the cutting tool sheet controlled in the same manner as that of the is in the adjustment to be cut of the band F _a ll. A rotor I96 of the encoder generator 177 is displaced in its angular position by the motor I66 as a function of corresponding signals from the digital computer 16l. The control transmitter I78 forms an output signal corresponding to this angular displacement of the rotor I96, which is amplified by the amplifier 179 to excite the clutches 190, I9I. The excitation of one of the two clutches 190, 19I leads to the adjustment of the carrier element which carries the cutting tool blade arranged on the guide, the angular position of the rotor 193 of the control transmitter I78 being changed at the same time. If the rotor I93 has been displaced by the same amount as the angular displacement of the rotor 1.96 «then the starting point is

reduced by the signal of the control transmitter 178 / the value zero, where-

can be de-excited by the clutches 190,191.

To create feedback fed into the computer Ιοί, the actual positions of the tape to be cut and the cutting tool blade on the respective Repeats guides, an output signal is output from the control transmitters 170, 178 through the respective amplifiers or 179 fed into the analog-to-digital converter 17 ^. Conveniently, each amplifier is 171 "x 179 with a Phase-sensitive detector provided, which is used for the AnMge the directions of rotation of the Rptoren 192, 193 and the appropriate Excitation of one of the two clutches 192 "193 is used"

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such that the support elements in the desired direction to be postponed on the tours.

In the position of switches 197 199 shown in FIG. 6, the stator windings of encoder generator 177 are each with stator windings of the control transformer I78 coupled. In another position the switch I97 are the stator windings of the control transformer I78 are connected to the stator windings of the encoder generator I69. This coupling of the encoder generator I69 with the Control transmitter I78 controls the position of the cutting tool blade depending on the angular rotation of the rotor

19 ^ controlled. I _n a third position of the switch - 199 the rotor windings de are "Steuerübertragers I78 with denStatorwicklungen an encoder generator 200 coupled" which has a rotor 201 which is mechanically connected to the rotor 192 of the SteuerUbertragers I70 and with the drive wheel by which the setting deszu cutting tape takes place. This coupling between the encoder generator and the control transformer I78 has the effect that

the cutting tool blade precisely follows the movement of the tape to be cut. It is common to use more than one • Cutters for a single winder desired. In these cases the cutting tool blades are and the tapes to be cut each on common

Guides, e.g. fastened rails. When attaching several Devices on a single guide must operate the drive elements of the individual cutting tools automatically can be switched off when the cutting tools overlap.

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In addition, it is desirable that the drive elements can each be switched off when the cutting tools have a certain distance in one direction or another have traversed in three cross machine direction.

^u emäß of the invention are mounted on opposite sides 202 and 203 of the switch carrier element carrying the tape to be cut and the motor L82. The switches 202, 203 can be with a fixed stop or with a be ~

■. -. ** ■ '■ -neighbors Carrier element come into engagement, such that the respective switch opened and the corresponding Clutch 188 or 189 is switched off.

According to FIG. 6, the switches 202 and 203 are arranged between the amplifier 1-1 and the forward clutch I88 or the reverse clutch I89. Similarly, switches 20 ¹ + and 206 are placed between booster 179 and forward clutch 190 and reverse clutch 19I, respectively. The switches 20, 4 and 206 are mounted on opposite sides of the support member which carries the cutting tool blade and adjustment motor 183 and are engageable with a fixed stop mounted on a support member for a cutting tool. The switches 202, 203 and 206 are coupled to a device 207 which supplies the digital computer 161 with appropriate signals when adjacent cutting tools overlap. If the computer 161 is unable to correct any overlaps that may occur, it can use a to display

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Reading consoles serving cutting tool overlays be provided.

Upon receipt of the correct setting of the to be cut Tape and the cutting tool blade, the carrier elements are locked on the guides, e.g. rails. In this position, the return information from the amplifier 171, 179 causes the computer to open the switch 181 + a and l8 * f b opens, whereby the adjustment gates I82 or 183 get into their rest positions. A relay 208 is connected via switches 18 ^ a and 18 ^ b to the input terminals 186 and 187 of the power source, respectively. The relay

208 is with multiple normally closed switches

209-212.

A current source is coupled to a pair of terminals 213 and 2l4. The switches 209-212 are each connected to the terminal 213 and one of the couplings I88-19I. Terminal 21 ¹ + is connected to a common line of clutches I88 - I9I. When the switches 19-8 ¹ Ia and 18 * fb are in the closed position, as is the case, for example, during the setting of the cutting tools, the motors 182, I83 and the relay 208 are energized, as a result of which the switches 209-212 remain in the open state and the current source connected to terminals 213, 21 * + is disconnected from couplings I88 to 19I. When switches 18 ¹ ^ a and l8 * + b are open, setting gates 182 and I83 and relay 208 are de-energized,

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whereby the switches 209 to 212 are in their closed state and the current source coupled to the terminals 213, 2lk is connected to the couplings £ 8 - 191. If the clutches 188-191 are energized and the motors 182, 183 are de-energized, the cutting tools will lock in their positions due to the high frictional resistance encountered during rotation, due to a large reduction in speed in the reducer portion of each motor.

For driving the belt and cutting tool of each cutting tool assembly drive motors can optionally be provided in each case. Whereby the cutting toolbH-att through Friction connection with. the belt is set in rotation. In this ISLl, the cutting tool blade must be pressed against the tape; to effect the frictional connection. Before the adjustment motors 182, I83 the carrier elements on the respective Lock guides, it is therefore necessary to shift the adjustment motor I83 by the amount of one or more steps. To achieve this shift is a so-called. contact pressure input 216 coupled to motor I66 is provided, through which a small step-wise shift of the cutting tool blade takes place relative to the band.

The invention is not limited to the embodiment shown above Exercise examples limited. For example, the Encoder generators 169 »177 and the control transmitters 170. 178

replaced by an electronic feedback device the positions of the individual, cutting unit

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Scans stuff devices. The stepping rotors 164,166 can be used directly with the cutting tool or be coupled to the tape to be cut. The stepping motors 164, l66 can also be connected to the computer l6l his «to get the exact setting of the cutting tools. By choosing this embodiment, the majority of the after arrangement is superfluous Fig. 6 required control device, since its functions be exercised by the computer 16l. An even simpler and therefore less complex and reliable arrangement is obtained by dispensing with the return signals indicating the actual position of the cutting tools. In this case the cutting tools are driven by precision stepping motors. The position of the cutting tools will determined here by keeping constant an algebraic sum of the pulses in a memory of the computer, which the Cutting tool, are supplied. This sum is linearly related to the position of the zero point, the can be selected at will.

The arrangement according to the invention is particularly suitable for the cutting tool assembly of U.S. Patent No.

3,176,566, according to which the cutting tool blade as an essentially flat disc is formed, the opposite Surfaces are connected to one another by a strip-shaped or conical surface element which has a sharp Forms cutting edge. The edge part of this element engages part of the circumferential edge of the lower band, whereby a shear effect is obtained. As already

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mentioned, the belt can frictionally drive the cutting tool blade.

For this purpose the cutting indexing motor 166 is elected
Small, step-shaped pulses supplied to the cutting tool blade are provided, whereby the cutting tool blade is pressed against the associated band and the frictional connection between these two is facilitated. The pressing process can be done manually
or can be controlled by the computer 16l, namely by a Mbsiganl supplied to it with the value zero.

- patent claims -

0098U / 0256

Claims (1)

-Patent claims: IJ device for controlling the position of several cutting tools which are used to cut a master roll made of a tissue material, for example paper, into at least two rolls of the desired smaller size, characterized in that a computer (11,41,91,121, I ¹ +! Or 16l ) is provided, in which several input signals corresponding to certain roles are fed in, the computer selecting from these signals that group of signals which results in minimal cutting losses when dividing the parent roll, and that the cutting tools each have an addressable approach to the selected AE input signals; ellmotpren (2 * +, 86 or 182,183) are coupled in such a way that the cutting tools are controlled in the positions corresponding to the selected input signals. 2. Apparatus according to claim 1, characterized in that two, with outputs of the computer (Id) coupled, digital Stepper motors (ΐό ^, ΐόό) are provided that each have shafts (16? or I68), their angular positions are proportional to the selected group of input signals and that control means are provided., each for exciting the adjustment motors (182,183) depending on the angular graduation of the associated Serve stepping motor. - 2 Q098U / Q256 3. Device according to claim 1, characterized in that "that scanning devices are provided for scanning the position of each cutting tool relative to a reference point are and that these positions corresponding return signals can be fed into the computer, which is dependent on these return signals energized the setting mark. H. Device according to Claim 3i, characterized in that the scanning devices have two digital setting transmitters which are each connected to a cutting tool. 5. Apparatus according to claim 3 «characterized in that that the scanners - (two shaft position encoders have, which are each coupled to one of the adjustment motors. 6. device according to claim 5 »characterized in that that an analog-digital converter responsive to the shaft position encoder is provided, which is connected to the computer, such that the computer jerks ignale guide bar which are proportional to the position of each cutting tool relative to a reference point. 7. Apparatus according to claim 1, characterized in that the computer is designed such that digital output signals can be generated that the adjustment motors each are responsive to these pulses in such a way that the corresponding cutting tools track a certain path 00981 A / 0256 are transported and that the computer has memory elements has, which are fed to the storage of the adjustment motors Number of pulses and to compare this number with the desired sizes of the roles. 8. Apparatus according to claim 1, characterized in that a digital-to-analog converter coupled to the computer it is provided that a coupled to the digital-to-analog converter Analog summer (66) is connected to each of the adjusting motors (86) and that feedback means are provided whose output diffiale is the one with the Ard.ag totalizer correspond to coupled cutting tool positions 9. Apparatus according to claim 8, 'characterized in that an analog DJgLtalwandler (77) is provided which is connected between the output of the analog summer (66) and the computer. 10. Device according to claim 1, characterized in that that several stepper motors connected to the computer (I6O (164 and 166) are provided, each having shafts 0.67) and (I68), the angular positions of which are the selected Group of input signals are proportional to the fact that encoder generators (I69 and 177) are provided, each are coupled to one of the stepping motors, that in each case by one of the transmitter control transmitters controlled (170 and I78) are provided, which are coupled to amplifiers (171 and 179) each with the 00 9 8 14/0256 - ^ - corresponding outputs of the control transmitter are connected and that the amplifiers with the adjustment motors (l82 resp. 183), which are dependent on the output signals of the respective amplifier. 11. The device according to claim 10, characterized in that that several clutches (188, 189 or 190, 19I) are provided which are each between the adjustment motors (l82 resp. 183) and a corresponding cutting tool are arranged, and that each coupling with a corresponding output one of the amplifiers (171 or 179) is coupled, each having a phase-sensitive detector. H / 0256