GB2274646A - Monitoring and controlling feed of webs - Google Patents
Monitoring and controlling feed of webs Download PDFInfo
- Publication number
- GB2274646A GB2274646A GB9401507A GB9401507A GB2274646A GB 2274646 A GB2274646 A GB 2274646A GB 9401507 A GB9401507 A GB 9401507A GB 9401507 A GB9401507 A GB 9401507A GB 2274646 A GB2274646 A GB 2274646A
- Authority
- GB
- United Kingdom
- Prior art keywords
- traction
- roller
- traction unit
- web
- motor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H23/00—Registering, tensioning, smoothing or guiding webs
- B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
- B65H23/18—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web
- B65H23/188—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web
- B65H23/1888—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web and controlling web tension
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H26/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms
- B65H26/02—Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms responsive to presence of irregularities in running webs
- B65H26/025—Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms responsive to presence of irregularities in running webs responsive to web breakage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2402/00—Constructional details of the handling apparatus
- B65H2402/60—Coupling, adapter or locking means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
- B65H2511/20—Location in space
- B65H2511/21—Angle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2513/00—Dynamic entities; Timing aspects
- B65H2513/10—Speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2513/00—Dynamic entities; Timing aspects
- B65H2513/50—Timing
- B65H2513/512—Starting; Stopping
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2553/00—Sensing or detecting means
- B65H2553/40—Sensing or detecting means using optical, e.g. photographic, elements
- B65H2553/41—Photoelectric detectors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2557/00—Means for control not provided for in groups B65H2551/00 - B65H2555/00
- B65H2557/20—Calculating means; Controlling methods
Landscapes
- Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Rotary Presses (AREA)
Description
2274646 TRACTION UNIT FOR A PRINTING MACHINE The invention relates to a
preferably electric traction unit for a printing machine with a central console and a central console computer, the traction unit, i.e. the unit for drawing the web off the reel, incorporating a traction roller driven by its own motor for drawing from a reel changer a web of material that is to be printed, an impression (pressure) roller for pressing the web of material that is to be printed against the traction roller, and a jockey roller arranged downstream of the traction roller in the direction of feed to equalise variations in the tension of the web.
Every printing machine for printing onto a web of material to be printed has a traction unit in order to feed the web of material to be printed from the reel changer to the printing units. An electric traction unit of the type mentioned at the beginning is known from the journal "Zeitungstechnik" (= "Newspaper Technology"), October 1992, pages 65 to 66. A web of material for printing is fed to a traction roller by means of a first directing or guide roller and a pressure roller presses it against the traction roller. The web of material to be printed is then looped around a jockey roller and is withdrawn from the traction unit via a second directing roller. The traction roller has its own motor; there is no mechanical link to the primary shaft of the printing machine, which means that it should be possible to site the traction unit anywhere in the substructure of the printing machine and to associate it as desired with various production systems within the printing machine without using auxiliary shafts and clutches. No explanation is given as to how to generate the optimum constant web traction for the printing process ahead of the first printing unit.
It is an object of the present invention to create a traction unit of the type mentioned at the beginning that ensures uniform traction of the web of material to be printed and greater flexibility.
According to one aspect of the invention there is provided a traction unit for a printing machine, the traction unit incorporating a traction roller driven by its own traction unit motor to draw out of a reel changer a web of material to be printed, a pressure roller for pressing the web of material to be printed against the traction roller, and a jockey roller arranged downstream of the traction roller in the direction in which the web runs, to compensate for fluctuations in the tension of the web of material to be printed, characterised in that a control and regulating unit controlled by a console computer is associated with the traction unit to specify the nominal speed of the traction unit motor and of the traction roller powered by the traction unit motor, the web of material to be printed imparting to the traction roller the web tension generated by the jockey roller, and in that the jockey roller is linked to the control and regulating unit by an angle sensor to transmit its actual angle, the control and regulating unit being adapted to regulate the speed of the traction unit motor in accordance with this angle output. The invention is also concerned with a corresponding method, in which the angle of the jockey arm is measured and used to control the motor speed. 30 It is especially advantageous to make the traction unit of modular construction; it consists of a large number of components which can easily be assembled together. The traction unit may be built onto a steel framework, a concrete base or a reel changer. By arranging the bores in its side walls mirrorsymmetrically it may be used for paper intake from either the right or the left without the design needing to be adapted.
The motor used to drive the traction roller is preferably a three-phase a. c. motor which is also able to operate in reverse and which feeds current back into the power system when braked. It preferably drives the traction roller via a V-belt, thereby reducing noise levels. All machine parts requiring regular maintenance, e.g. the V-belt or the supply of lubricant to the bearings, are arranged so as to be readily accessible from the outside. Overall the traction unit is distinguished by economy of space, constant traction of the web of material to be printed, and accurate and fast adjustment. The web of material for printing can be braked by the motor without a mechanical brake.
The traction unit can also be designed to be controlled independently of the other parts of the printing machine, e.g. by key switches for manually advancing the unit in the jog range (step operation).
In the direction in which the web of material for printing moves, websevering devices are arranged before and after the traction roller in order to limit the amount by which the remainder of the web of material for printing winds itself onto the traction roller when the web is torn off.
The traction roller may be monitored by optical sensors to check that the material to be printed does not wind itself around the traction rollers. The sensors are preferably self-cleaning. The traction unit preferably has a low-inertia jockey roller.
The pressure roller can be moved into and out of position electropneumatically; the force with which it is applied can be adjusted. The traction roller preferably has a four-quadrant three-phase servo drive.
A tacho-generator fitted to the traction roller transmits the speed thereof to the reel changer. The -4 fact that the jockey roller is arranged downstream of the traction roller means that peaks of web tension produced when the pressure roller is swung against the traction roller and when the printing operation begins can be readily eliminated; the traction of the web can be very precisely specified. It is a simple matter to remove any material that might wind itself onto the traction roller in the jog range, thereby minimising machine stoppage times. The traction roller and the jockey roller are preferably so arranged that if the paper web tears it drops downwards without getting caught in other moving parts of the traction unit. The pressure roller is so arranged that in the event of a pressure or power loss, its own weight will cause it to move away from the traction roller, thereby preventing the paper web from becoming wound around the pressure roller. During the paper intake operation and while the printing machine is being brought up to speed, pressure equal to the web traction programmed at the console is advantageously arranged to act on the jockey roller of the traction unit. Because the web traction at this instant is less than the programmed traction, the jockey roller assumes the upper extreme position and behaves like a directing or guide roller installed in a fixed position. This has the following advantages: The paper is drawn in with the web traction at a very low level predetermined by the reel changer; 30 Once web traction adjustment has been activated, the paper web is not suddenly tensioned and torn off, but is increasingly tensioned linearly until the nominal value is attained; and During paper intake the web traction is not lost 35 as the jockey roller moves, thereby preventing the paper from tearing due to abrupt tautening of the web.
On its upper surface the traction unit preferably incorporates a protective grating which prevents the intake of paper webs that fall from above from becoming wound in. The tacho-generator, which measures the speed of rotation of the traction roller, can"also be used to determine the length of paper web that has already been unwound, by multiplying the diameter of the traction roller by the number of revolutions. This value can be permanently displayed on the console.
The framework of the traction unit preferably consists of rigid side walls and cross-members which reinforce the traction unit sufficiently for sectional assembly and for shipping. It is possible to assemble and disassemble all the individual parts of the traction unit between the side walls at a later date, specifically also the traction roller. The traction roller may be constructed as a stackable module, which makes it suitable for container shipping and means that it takes up less floor space than conventional traction units. The traction unit preferably also has feet to stand on, thereby allowing it to be fitted at a suitable height. Also the V-belt between the motor and the traction roller can be fitted from the outside.
This makes it easy to remove; the tension of the V-belt can be adjusted with a setting device.
The complete module of the traction unit should include a pneumatic connection and an electrical preinstallation. The roller-contact bearings for feeding the paper are lubricated for life. If lubricated by hand, the traction unit will preferably have centrally concentrated lubricating nipples, and preferably also a very low-maintenance automatic central lubrication system with a lubricant filling level indicator on the console. All maintenance operations for the electrical and pneumatic systems of the traction unit can be carried out from just one side wall. Maintenance work is carried out on mechanical components of the traction unit from the other side wall.
The invention will now explained in greater detail in relation to one embodying example with reference to the drawings, wherein:
Fig. 1 shows a function chart of a printing machine with a traction unit and a reel changer; Fig. 2 shows a lateral cutaway view of the traction unit; Fig. 3 shows a partially cut away, plan view onto the traction unit; and Fig. 4 shows a further plan view onto the traction unit.
A printing machine incorporates a console 1 (Fig. 1) with a console computer V, from which an operator inputs the desired production parameters for the printing machine, for example the number of printed copies per hour and the web traction for a traction unit and the printing units of the printing machine.
The console computer 1' sends the nominal web traction value direct to an electropneumatic converter 2, which is part of a traction unit 10. In addition to the traction unit 10, the printing machine has a reel changer 16 mounted ahead of the traction unit 10 and at least one printing unit or a plurality of printing units.
On the basis of the production parameters input by the operator, the console computer 11 ascertains the desired or nominal speed of a directing or main motor 5, which is part of a main drive 50 of the printing machine, and passes this value to a production computer 3 arranged downstream of the console computer 1'. The production computer 3 passes on this value to a control and regulating unit 4 for the directing motor 5.
-7 If, when the paper web is being drawn in from the reel changer or at the start of printing, the directing motor 5 is accelerated to the nominal speed in accordance with an acceleration curve stored either in 5 the console computer 1' or in the production computer 3, the speed of the directing motor 5 is then notified to the production computer 3 at fixed time intervals by a tacho-generator 6 via the control unit 4. The production computer 3 converts the speeds thus obtained from the directing motor 5 into nominal speeds for the traction unit 10 and sends them on down a data line 31 to a control and regulating unit 7 for the traction unit 10. In the event that other traction units are provided in addition to the traction unit 10, the production computer 3 passes on the nominal speeds to the other traction units down additional data lines 32, 33.
Furthermore, the console computer 1' passes on the nominal web traction value direct to the control and regulating unit 7 and to an electropneumatic converter 2. The electropneumatic converter 2 converts the electrical signal to a proportional air pressure, which bears on a jockey roller 100 during the printing operation. The jockey roller 100 dances to and fro between two stops 109 and 110 (Fig. 2) during the printing operation; an angle sensor 11 advises the control and regulating unit 7 of the rotational angle assumed by the jockey roller 100 at that particular point, based on a zero position. The control and regulating unit 7 regulates the speed of rotation of a traction unit motor 8. The mid-position of the jockey roller 100 is defined in the control and regulating unit 7 as the "zero" nominal angular value.
Regulation of the mid-position of the jockey roller 100 is initiated upon receipt of the first "faster" command. From this point in time the speed correction value from the jockey roller adjustment is 1q- superimposed upon the speed specified by the production computer 3. Because the traction of the web is smaller than demanded until the first "faster" command is received, the jockey roller 100 is situated in the upper limit position. In order for web traction to be correct, the jockey roller 100 must be located in the horizontal position (mid-position). Because the traction unit control system detects a difference in angle via the angle sensor 11, the speed of the motor of the traction unit 10 is reduced in relation to the nominal value specified by the production computer 3 until the nominal value in respect of the angle has been reached. The traction unit motor 8 re-advises the control and regulating unit 7 of its current speed via a tacho-generator 9.
The traction unit motor 8 drives a traction roller 120 by means of a Vbelt 80. A paper web is looped around part of the traction roller 120, and during the printing operation a pressure roller 130 presses the paper web at a fixed programmed pressure against the traction roller 120 in order to impart friction so that a given web tension can be set up in the paper web.
The pressure roller 130 is brought up against the traction roller 120 at a different time from, and preferably later than, the activation of the jockey roller control system. This has the advantage that the resulting jump in web traction as the pressure roller 130 is brought into position is damped by the jockey roller adjustment system already activated.
So that the paper web also exhibits sufficient web tension on the input side on the traction roller 120, the speed of the traction roller 120 is sent on via a tacho-generator 12 to a control and regulating unit 13 for the reel changer 16. The control and regulating unit 13 converts the traction roller speed specified by -g- the traction unit 10 into a nominal speed value for a 19- motor 14 which rotates the particular roll of paper to be unreeled. Via a tacho-generator 15 it sends its actual speed value to the control and regulating unit 13. The reel changer 16 incorporates a jockey roller 160 which passes its actual angular value, based on a zero position, via atangle sensor 18 to the control and regulating unit 13. In order to obtain the desired web traction, a correction value ascertained by the jockey roller adjustment system is superimposed on the nominal speed value ascertained by the control and regulating unit 13.
The sequence of jockey roller adjustment in the reel changer 16 is identical to that in the traction unit 10.
An electrical signal generated by the control and regulating unit 13 is converted to a pneumatic signal in an electropneumatic converter 19. A pressure corresponding to the desired web traction then bears on the jockey cylinders in the form of diaphragm cylinders 105.
The traction unit 10 (Fig. 2) has side walls made of cast iron joined together by cross-members and strengtheners 101. The strengtheners or cross-rails 101 are preferably of hollow internal construction so as to accommodate electrical cables or pressure lines. A protective grating 102 protects the traction unit 10 from paper falling from above. A pressure equalisation tank 103 (Figs. 2-4) is provided which is connected to jockey cylinders 105 (Figs. 2 and 3) via pressure lines 104 (Fig. 3). The jockey roller 100 is attached via mounts 106 to a rotatable bar 107. The angle by which the jockey roller 100 swivels out in each case is notified to the control and regulating unit 7 via the angle sensor 11 (Fig. 3). A permanently adjustable pneumatic cylinder 131 presses the pressure roller 130 against the traction roller 120.
A paper web 140 (Fig. 2) is drawn out of the reel changer 16 via directing rollers 141, 142 and through between the traction roller 120 and the pressure roller 130, and via additional directing rollers 143, 144 out of the traction unit and into the first printing unit (not shown) of the printing machine. Severing devices 145 and 146 for severing the paper web 140 in the event of a paper tear are arranged between directing rollers 141 and 142 and between directing rollers 143 and 144 respectively.
To see to it that the paper web 140 does not wind itself onto the traction roller 120 in the event of the web tearing, the traction unit 10 incorporates sensors 151 to 154. These optically monitor the surface of the traction roller 120 on the side away from the pressure roller and in the event of paper winding itself onto the traction roller they cause the cutting devices 145, 146 to sever the paper web 140 and stop the traction unit motor 8 as quickly as possible. There are preferably four of these sensors 151 to 154, each monitoring a quarter of the paper web 140 in the axial direction. They react to a tear in the web within a fraction of a second.
The sensors take advantage of the difference in the surface of the paper web 140 from the polished surface of the traction roller 120, and each may include an optical transmitter and an optical receiver.
The optical transmitters generate a light spot on the surface of the traction roller 120. The nature of the surface gives rise to a certain contrast ratio, which causes a greater or lesser amount of scattering back into the optical receivers in the sensors 151 to 154.
The optical receivers in the sensors 151 to 154 for example generate a voltage proportional to the intensity of the light entering them. Because the difference in contrast between the consistency of the surface of the metal traction roller 120 and the paper is not sufficient for the paper web 140 to be recognised by simple reflection the sensors 151 to 154 are arranged at an acute angle, i.e. inclined to the surface of the traction roller 120, with the result that the optical receivers only receive light once the traction roller 120 has begun to wind the paper web 140 around itself, whereupon the surface consistency of the paper scatters enough light back to the optical receivers to generate a voltage signal that triggers the cutting devices 145, 146. As long as the sensors 151 to 154 radiate light onto the metallic surface of the traction roller 120 light is not diffused back but is reflected away from the sensor.
To remove any contaminants such as paper dust or fluff from the sensors 151 to 154 they are cleaned with compressed air, either whilst they are in operation, or preferably when the pressure roller 130 is parked. The sensors 151 to 154 reduce the adverse effects of paper becoming wrapped round the traction unit as the paper web 140 is being drawn in or during production itself; a signal emitted by the sensors 151 to 154 tells the operator on the console 1 that paper has become wrapped around the traction roller.
Several instances of paper wraps around the traction unit may be differentiated while the traction unit 10 is in operation: if the sensors 151 to 154 detect paper on the traction roller 120, it suffices if the cutting device 145 severs the paper web 140 and the traction unit motor 8 is switched off without the paper web 140 tearing. Should the paper happen to tear in the area between the reel changer 16 and the traction unit 10, the tear is detected on the basis of the angular position of the jockey roller 160 in the reel changer 16; a corresponding signal is sent to the lq control and regulating unit 13, which switches off the motor 14. If, however, the paper should happen to tear between the traction unit 10 and the first printing unit of the printing machine, the tear will be discovered by the jockey roller 100, and the cutting devices 145, 146 both sever the paper web 140. The traction unit motor 8 is quickly brought to a standstill by a rapid-response stop. If a tear in the paper web 140 causes paper to become wrapped around the traction roller during printing, this will be detected by the sensors 151 to 154 as described above. In this event, too, both cutting devices 145, 146 sever the paper web 140; the traction unit motor 8 is again halted by a rapid-response stop. If a paper-cutting device in one of the printing units or between the printing units responds, this will be recognised by the respective paper tear security device, and both cutting devices 145, 146 will respond by cutting through the paper web 140, and the traction unit motor 8 will be halted by a rapid-response stop. A voltage failure is recognised by the fact that the contactor drops out; the traction unit motor 8 is halted by a rapid-response stop; the cutting devices 145, 146 are not triggered.
If a new paper web 140 is to be drawn into the printing machine, the speed of the machine must be accelerated from standstill to a drawing-in speed. The control and regulating unit of the reel changer 16 applies a "hover" pressure to the jockey roller 160, causing the latter to remain in a mid-position. In contrast, a signal from the console computer 11 causes a pressure proportional to the programmed web traction to be applied to the jockey roller 100 of the traction unit 10, causing the jockey roller 100 to be locked in its upper extreme position. The jockey roller 100 thus behaves like a guide roller installed in a fixed position. This has the advantage that when the jockey roller 100 is brought into position during paper intake, the traction of the web is not lost and the paper is prevented from tearing due to any sudden tautening of the paper web. During the paper intake operation the pressure roller 130 remains parked, lifted off the traction roller 120; the production computer 3 passes on the speed of the directing motor 5 to the control and regulating unit 7 and thence to the traction unit motor 8.
The starting of the printing machine for printing operation takes place under the same conditions, until a speed is reached at which the operator gives a 'faster' instruction. The jockey roller 160 is now at operating pressure but remains in mid-position. Midposition adjustment of the jockey roller 100 of the traction unit 10 is initiated by the console computer V, and, in staggered (delayed) timing to the initiation of mid- position adjustment, the pressure roller 130 is set against the traction roller 120. Simultaneously the jockey roller 100 moves from the upper extreme position to the middle position. Midposition adjustment of the jockey roller 100 is now triggered. This means that the jockey roller swings out of its mid-position in accordance with the tension of the paper web 140, that the phase-angle sensor 11 transmits the amount of this deflection to the control and regulating unit 7 and the latter modifies the rotational speed of the traction unit motor 8 in accordance with the excursion, which in turn affects the rotational speed of the traction roller 120 and thus the traction of the paper web 140. Once the directing motor 5 has attained a sufficiently high speed, the 'print-on position' is reached.
In summary, the invention concerns an electric traction unit 10 for a printing machine, incorporating a traction roller 120 driven by its own traction unit motor 8 to draw in from a reel changer 16 a web 140 of material to be printed, a pressure roller 130 for pressing the web of material to be printed against the traction roller 120, and a jockey roller 100 arranged downstream of the traction roller 120 in the direction in which the web runs, to compensate for fluctuations in web tension. The traction unit 10 possesses a control and regulating unit 7 controlled by a console computer 1' of the printing machine, to specify the nominal speed of rotation of the traction unit motor 8 and of the traction roller 120 powered by it. The web 140 of material to be printed imparts the web tension generated by the traction roller 120 and the pressure roller 130 to the jockey roller. The jockey roller 100 sends its angular deviation from the zero position to the control and regulating unit 7 via an angle sensor 11, so that the unit 7 can control and regulate the speed of the motor 8 accordingly. The traction unit 10 is preferably equipped with cutting devices 145, 146 to avoid paper continuing to be wrapped around the traction roller if the web 140 of material to be printed should tear. The traction roller 120 is preferably fitted with optical sensors 151 to 154, which recognise when paper becomes wrapped around the traction roller by the surface consistency of the traction roller 120, and then trigger the cutters. The sensor and cutter arrangement can also be used for other kinds of feed devices for webs to ensure that the feed is stopped and/or the web is cut once the sensor detects that the web has wrapped itself round the traction roller.
Claims (21)
1. Traction unit for a printing machine, the traction unit (10) incorporating a traction roller (120) driven by its own traction unit motor (8) to draw out of a reel changer (16) a web (140) of material tobe printed, a pressure roller (130) for pressing the web (140) of material to be printed against the traction roller (120), and a jockey roller (100) arranged downstream of the traction roller (120) in the direction in which the web (140) runs, to compensate for fluctuations in the tension of the web (140) of material to be printed, characterised in that a control and regulating unit (7) controlled by a console computer (1') is associated with the traction unit (10) to specify the nominal speed of the traction unit motor (8) and of the traction roller (120) powered by the traction unit motor (8), the web (140) of material to be printed imparting to the traction roller (120) the web tension generated by the jockey roller (100), and in that the jockey roller (100) is linked to the control and regulating unit (7) by an angle sensor (11) to transmit its actual angle, the control and regulating unit (7) being adapted to regulate the speed of the traction unit motor (8) in accordance with this angle output.
2. Traction unit according to claim 1, in which associated with the traction unit motor (8) is a first tacho-generator (9) which outputs the actual speed of the motor to the control and regulating unit (7).
3. Traction unit according to claim 1 or 2, in which associated with the traction roller (120) is a second tacho-generator (12) which outputs the speed of the roller to the reel changer (16).
4. Traction unit according to claim 2 or 3, in which the traction unit motor (8) is a four-quadrant three-phase a.c. motor which acts as a generator when braked, the current thereby generated being fed back, X in use, into the power circuit.
5. Traction unit according to any of claims 2 to 4, in which the traction unit motor (8) drives the traction roller (120) via a V-belt (80).
6. Traction unit according to any of claims 1 to 5, further including means enabling it to be operated manually independently of the printing machine in jog mode.
7. Traction unit according to any of the preceding claims, in which the pressure roller (130) is arranged beneath the traction roller (120).
8. Traction unit according to any of the preceding claims and incorporating side walls, one of w]ich is provided for the pneumatic connections and the electrical connections.
9. Traction unit according to any of the preceding claims, which on its upper face is protected from paper falling from above by a protective grating. 20
10. Traction unit according to any of the preceding claims and incorporating centrally concentrated lubricating nipples forming a central lubrication system, with a filling level indicator to be arranged on a printing machine console (1). 25
11. A press including a printing machine and a traction unit according to any of claims 1 to 10, in which the traction unit is arranged beneath the steel substructure or concrete base of the printing machine and alongside the reel changer (16). 30
12. Traction unit for a printing machine, the traction unit (10) incorporating a traction roller (120) driven by its own traction unit motor (8) to draw out of a reel changer (16) a web (140) of material to be printed, a pressure roller (130) for pressing the web (140) of material to be printed against the traction roller (120), and a jockey roller (100) arranged downstream of the traction roller (120) in the direction in which the web (140) runs, to compensate for fluctuations in the tension of the web (140) of material to be printed, characterised in that at least one sensor (151 to 154) is provided to monitor the surface of the traction roller (120).
13. Traction unit according to claim 12, in that the or each sensor (151 to 154) incorporates an optical transmitter and an optical receiver, the transmitter radiating light onto the surface of the traction roller (120) and the receiver receiving light reflected back from the surface of the traction roller (120).
14. Traction unit according to claim 13, in which each sensor (151 to 154) is directed at an acute angle onto one surface of the traction roller (120) and in that it is only when the surface of the traction roller (120) is covered with paper, owing to paper having wound itself around it, that light is scattered back from its surface to the optical receiver of the or each sensor (151 to 154).
15. Traction unit according to any of claims 12 to 14 and having cutting devices (145, 146) which can be activated by the sensors (151 to 154) to sever the web (140) of material to be printed.
16. Traction unit according to any of claims 12 to 15, characterised in that the sensors (151 to 154) are associated with a means for cleaning them using compressed air.
17. Method for operating a traction unit according to any of claims 1 to 10 and 12 to 16, characterised in that when drawing in a web (140) of material to be printed the jockey roller (100) of the traction unit (10) is locked in its upper extreme position.
18. Method according to claim 17, in which the jockey roller (100) is initially locked pneumatically 18- in its upper extreme position, that a mid-position T_ adjustment command is then output by the console computer (1'), that the roller assumes its mid-position once a higher speed is reached, at which point its mid- position adjustment cuts in, and that the pressure roller (130) is brought up against the traction roller (120) with staggered timing to the mid-position adjustment.
19. A method of operating a traction unit for a printing machine, the traction unit (10) incorporating a traction roller (120) driven by its own traction unit motor (8) to draw out of a reel changer (16) a web (140) of material to be printed, a pressure roller (130) for pressing the web (140) of material to be printed against the traction roller (120), and a jockey roller (100) arranged downstream of the traction roller (120) in the direction in which the web (140) runs, to compensate for fluctuations in the tension of the web (140) of material to be printed,
20 characterised in that the speed of the traction unit motor (8) and thus of the traction roller (120) powered by the traction unit motor (8) are controlled in dependence on the angle of the jockey roller (100). 20. A method according to claim 19, in which the motor speed is controlled in such a way as to keep the jockey arm in a substantially constant position.
21. A traction unit substantially as described herein with reference to the accompanying drawings.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4302189A DE4302189A1 (en) | 1993-01-27 | 1993-01-27 | Electric traction mechanism |
Publications (2)
Publication Number | Publication Date |
---|---|
GB9401507D0 GB9401507D0 (en) | 1994-03-23 |
GB2274646A true GB2274646A (en) | 1994-08-03 |
Family
ID=6479025
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9401507A Withdrawn GB2274646A (en) | 1993-01-27 | 1994-01-26 | Monitoring and controlling feed of webs |
Country Status (5)
Country | Link |
---|---|
JP (1) | JPH06340059A (en) |
DE (1) | DE4302189A1 (en) |
FR (1) | FR2700760A1 (en) |
GB (1) | GB2274646A (en) |
IT (1) | IT1266461B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015184079A1 (en) * | 2014-05-29 | 2015-12-03 | Corning Incorporated | Apparatuses and methods for measuring an angle between a web of material and a conveyance direction |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0745890A1 (en) * | 1995-05-30 | 1996-12-04 | Eastman Kodak Company | Film web motion control system |
DE19712689A1 (en) * | 1997-03-26 | 1998-10-01 | Heidelberger Druckmasch Ag | Method of regulating paper tension in offset printing machine |
DE19820764C2 (en) * | 1998-05-08 | 2003-08-28 | Roland Man Druckmasch | unwinding |
DE19834725A1 (en) * | 1998-07-31 | 2000-02-03 | Wifag Maschf | Web tension control device |
JP2002240234A (en) * | 2001-02-21 | 2002-08-28 | Miyakoshi Printing Machinery Co Ltd | Multi-web machine |
DE10222364C1 (en) * | 2002-05-21 | 2003-11-27 | Roland Man Druckmasch | Web breakage detection device, for rotary printing machine, uses displacement of guide roller bearing shell relative to carrier element upon loss of web tension |
DE10222363A1 (en) * | 2002-05-21 | 2003-12-11 | Roland Man Druckmasch | Retention device for printing material path moving in roller rotation printing machine has rapid-reaction actuator arrangement for clamping device directly driven by sensor on detecting material tear |
DE10227694A1 (en) * | 2002-06-19 | 2004-01-29 | Koenig & Bauer Ag | Device and method for detecting a running disturbance in a running material web |
DE102016109873A1 (en) * | 2016-05-30 | 2017-11-30 | Manroland Web Systems Gmbh | Method for operating a web-fed printing machine |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1348673A (en) * | 1970-07-31 | 1974-03-20 | Benninger Ag Maschf | Apparatus for simultaneously feeding a number of webs |
GB1501292A (en) * | 1974-03-04 | 1978-02-15 | Butler Automatic Inc | Web tension control apparatus |
GB2250273A (en) * | 1990-11-29 | 1992-06-03 | Molins Plc | Web tension control system |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
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FR426833A (en) * | 1910-05-12 | 1911-07-19 | Thenard Soc | Feeding device with automatic adjustment of strips of paper, fabric or other materials, cables and all articles liable to be rolled up |
GB843184A (en) * | 1955-11-08 | 1960-08-04 | Hilmar Vits | A variable speed hydraulic drive |
DE7046973U (en) * | 1970-12-19 | 1973-11-22 | Koenig & Bauer Ag | Draw roller drive |
NL7408757A (en) * | 1974-06-28 | 1975-12-30 | Tno | LIKE FOR ANTS. |
DE2549762C2 (en) * | 1975-11-06 | 1987-02-12 | Maschinenfabrik Goebel Gmbh, 6100 Darmstadt | Device for maintaining a stretch |
JPS60115449A (en) * | 1983-11-28 | 1985-06-21 | Toshiba Mach Co Ltd | Protecting apparatus for printing machine |
WO1986002318A1 (en) * | 1984-10-18 | 1986-04-24 | Mitsubishi Jukogyo Kabushiki Kaisha | Rotary press starting structure |
IT1208728B (en) * | 1984-12-27 | 1989-07-10 | Colgate Palmolive Co | STRETCH CONTROL DEVICE IN THE LAMINATION OF BAND WINGS |
DE3731214A1 (en) * | 1987-09-17 | 1989-03-30 | Koenig & Bauer Ag | DEVICE FOR THE CONTROLLED FEEDING OF TAPE MATERIAL TO PRINTING MACHINES, AND A METHOD AND DEVICE FOR IMPLEMENTING THE METHOD FOR REGULATING A CORRESPONDING CONTROL SIGNAL |
DE3812295C1 (en) * | 1988-04-13 | 1989-07-06 | Albert-Frankenthal Ag, 6710 Frankenthal, De | |
JP2666146B2 (en) * | 1988-06-03 | 1997-10-22 | 株式会社小森コーポレーション | Paper feed error detection device for sheet-fed printing press |
US4966074A (en) * | 1989-02-13 | 1990-10-30 | Aldrich Jr Wesley C | Web wrap detection system for an offset web printing press |
-
1993
- 1993-01-27 DE DE4302189A patent/DE4302189A1/en not_active Ceased
- 1993-12-13 IT IT93RM000823A patent/IT1266461B1/en active IP Right Grant
-
1994
- 1994-01-25 FR FR9400749A patent/FR2700760A1/en active Pending
- 1994-01-26 GB GB9401507A patent/GB2274646A/en not_active Withdrawn
- 1994-01-27 JP JP6007635A patent/JPH06340059A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1348673A (en) * | 1970-07-31 | 1974-03-20 | Benninger Ag Maschf | Apparatus for simultaneously feeding a number of webs |
GB1501292A (en) * | 1974-03-04 | 1978-02-15 | Butler Automatic Inc | Web tension control apparatus |
GB2250273A (en) * | 1990-11-29 | 1992-06-03 | Molins Plc | Web tension control system |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015184079A1 (en) * | 2014-05-29 | 2015-12-03 | Corning Incorporated | Apparatuses and methods for measuring an angle between a web of material and a conveyance direction |
Also Published As
Publication number | Publication date |
---|---|
ITRM930823A1 (en) | 1995-06-13 |
GB9401507D0 (en) | 1994-03-23 |
IT1266461B1 (en) | 1996-12-30 |
JPH06340059A (en) | 1994-12-13 |
ITRM930823A0 (en) | 1993-12-13 |
DE4302189A1 (en) | 1994-07-28 |
FR2700760A1 (en) | 1994-07-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |