EP0349705A2 - Roll unwinding device, especially for a printing machine, and method for introducing clamping sleeves in the core of a roll - Google Patents

Abstract

A roll unwinding device, especially for a printing machine, possesses clamping sleeves (23) having tapering end sections (41). The carrier receiving the roll (2) is freely movable, at least to a degree of horizontal freedom of movement, so that an automatic alignment of the core with the clamping sleeve takes place when the clamping sleeves (23) are introduced in the core. In the vertical direction, the force exerted by the tapering end section (41) can be determined by a force measuring device and be used for adjusting a lifting device. The height of the roller carrier can also be adjusted while the clamping sleeves are loaded in the direction of introduction. This permits a simple automatic alignment. <IMAGE>

Description

The invention relates to a roll unwinding device, in particular for a printing press, with a roll holding device which has two clamping pins which can be displaced relative to one another by a drive for engaging in a sleeve of the roll, and with a roll feed device which has a roll carrier. which is adjustable in height by means of a lifting device and on which the roller can be moved between the clamping pins, in particular by means of a first carriage which can be moved parallel to the clamping pin axis and by means of a second carriage which can be moved perpendicular to the clamping pin axis, and to a method for inserting the clamping pins into the sleeve a roll in such a roll unwinding device.

In a known device of this type (DE-PS 34 02 582), the first carriage having the roller carrier can be moved on a lifting platform. This is supported with the interposition of the lifting device on the second carriage, which can be moved on a stationary path. For the purpose of aligning the ends of the roller sleeve with the clamping pins, the roller mounted on the roller carrier can be adjusted in the vertical direction, parallel to the axis of the clamping pin and perpendicular to it. The Alignment is done by hand by an operator, which is time and personnel consuming. If you want to automate the process by determining the desired position based on a previous measurement of the roll data, difficulties arise if the roll circumference is not cylindrical, but conical and / or the sleeve is not exactly centered on the roll circumference, as is often the case in practice the case is.

It is therefore already known (brochure "Cerutti's new robot-driven photogravure presses") to determine the position of the sleeve ends in a separate measuring station with the aid of conical sensors and to eliminate any deviations from the nominal value by means of motorized displacement of the roll. In addition to the lifting, longitudinal and transverse movement, the roller carrier can also perform a pivoting movement about a vertical axis of rotation. This measuring station requires additional space and requires a sensitive and therefore expensive special measuring device.

The invention has for its object to provide a roll unwinding device of the type described above, which enables an automatic alignment process taking into account the actual position of the sleeve ends, but without a separate measuring station.

This object is achieved in that the clamping pins have tapered end sections and the roller carrier is freely movable in at least one horizontal degree of freedom of movement when the clamping pins are inserted into the sleeve, so that the sleeve is automatically aligned with the clamping pin during this insertion.

When the clamping pins are moved against each other, they engage with their tapered end sections in the sleeve ends and, in the event of deviations from the central position, exert forces which, because of the free mobility of the roller carrier, lead to a displacement of the roller in the horizontal plane until the sleeve ends are centered have set to the chucking spigot. This "shaving" results in alignment in the horizontal plane, in which no motors and therefore no control loops are required for motor control. Rather, the roller carrier can be separated from the horizontal drives. Alignment is quick. No additional space is required for a measuring station.

The roller carrier is expediently pivotable in the horizontal plane when the clamping pins are inserted. In this way, even conically wound rolls are aligned safely. Since the swiveling again takes place under the influence of the tapering end sections of the clamping pins, a swiveling drive is unnecessary.

In a preferred solution, the pivoting takes place in that the roller carrier is pivotable on a pivoting element about a vertical axis of rotation.

The best results can be seen if the roller carrier is freely movable when inserting the clamping pins in all three horizontal degrees of freedom of movement, namely displacement parallel to the clamping pin axis, displacement perpendicular to the clamping pin axis and pivoting about a vertical axis of rotation. An exact alignment in the horizontal plane is obtained without constraints.

It can be ensured that a one-way clutch is connected between the first and / or second carriage and the associated motor.

An alternative is that the roller carrier is supported on at least one gas cushion when the clamping pins are inserted. The gas cushion, in particular an air cushion, has a supporting surface which allows a movement relative to the lower support which is sufficiently large for the alignment process.

It is particularly favorable that the first and / or second carriage can be moved on air cushions. In particular, the second carriage can have four air cushions, which are arranged at the ends of a rectangle. Such air cushions for driving purposes are known (EP-A-0 148 502). In the present case, however, they have the further function of giving the roller carrier sufficient horizontal mobility when inserting the pins and of simply changing the height of the roller axis.

In a preferred embodiment, it is ensured that the lifting device is arranged in a stationary manner and adjusts a lifting frame in height and that the second carriage can be moved on the lifting frame and the first carriage can be moved onto the second carriage. As a result, the mass to be displaced by the clamping pins when aligning in the horizontal plane is kept small. Because the lifting device and lifting frame do not take part in the movement.

In particular, the swivel element can be arranged in the path of the second carriage and a bearing forming the axis of rotation can be arranged on the lifting frame below the clamping pins located in the receiving position. The advantage of the low moving mass also applies here. Because the parts firmly connected to the lifting frame do not take part in the alignment shift.

It is very particularly favorable that the gas cushion is arranged on the second carriage and carries a track section for the first carriage. This is because the mass of the feed device to be displaced is limited to the first carriage and an associated path section.

It is particularly advantageous to ensure that the roller carrier can be lowered when the tensioning pin is loaded in the insertion direction. This allows a particularly low-force insertion.

To align the sleeve ends in the vertical direction, it is provided that the lifting device has at least two lifting elements which are arranged offset in the direction of the clamping pin axis and are adjustable independently of one another. With such a lifting device, one-sided stroke adjustment can be carried out to adapt to the sleeve axis in the case of a conical winding.

It is particularly recommended that a force measuring device is assigned to the sides of the roller carrier which are offset in the direction of the clamping pin axis, depending on which the mutually offset lifting elements can be adjusted. The tapered end sections exert a corresponding force on the roller in the event of a positional deviation of the sleeve in the vertical direction, which leads to a change in the signal of the force measuring device leads to the appropriate page. The corresponding sleeve end can be adjusted by one-sided stroke adjustment until the force measuring device shows the original value again at the correct altitude.

The force measuring device on each side expediently consists of at least one measuring unit, each measuring a wheel load of the second carriage. This allows a very simple measurement.

It is particularly favorable that the lifting elements for rough alignment in rapid traverse and for fine alignment can be actuated in creep speed by means of the force measuring devices. This results in a particularly quick overall alignment.

It is also recommended that the lifting device has gas cushions which are offset in the direction of the clamping pin axis and whose gas pressure can be changed by means of a valve arrangement. Such gas cushions, also in the form of air cushions, allow a very simple change in height by changing the pressure.

In particular, the gas cushions can be arranged on a lifting table which remains aligned horizontally when the height is adjusted. This results in a particularly simple embodiment in which the lifting table effects the rough height adjustment and the gas cushion the fine height adjustment.

In this embodiment, the lifting table can be a scissor lifting table.

To control the gas cushion, the valve arrangement can have a pressure reducing valve with an adjustable outlet pressure. The desired change in height results from a change in pressure.

Another alternative is that the valve arrangement has a height position controller whose setpoint is adjustable. If the setpoint changes, the support surface of the gas cushion follows this setpoint.

In particular, a roller diameter measuring device can be provided, depending on which the lifting device can be actuated for rough height adjustment. The relatively simple diameter measurement, which is unusable in the case of conical rollers and eccentrically arranged sleeves, can be used because the rough alignment is followed by a fine alignment.

A comparator, which receives force signals from the force measuring devices and actuates the trunnion drive in the pull-out direction when an adjustable value is reached, also offers advantages. Here, the force measuring devices are also used to automatically pull out the clamping pins when removing a roll.

According to a further embodiment, a residual roll receiving surface is located on the second carriage next to the track for the first carriage, which is inclined in the direction of said track and ends at the level of the roll carrier. In this way, residual rolls with a small diameter can also be removed from the unwinder. You then roll over the inclined surface onto the roller carrier.

In this context, it is advantageous if the residual roll receiving surface is assigned a clamp for clamping the remaining roll. It is also recommended that the second carriage carry a roll stop device on the side of the web opposite the residual roll receiving surface for the first carriage.

From a procedural point of view, it is advisable to proceed in such a way that the roller carrier is roughly aligned in height and that the height of the roller carrier is then changed in order to insert the clamping pins into the sleeve. In this way, the clamping pins can be securely inserted into the sleeve with relatively low forces.

This can be done in particular by arranging the roller carrier at such a height that the sleeve axis is located somewhat above the clamping pin axis, and then lowering the roller carrier to insert the clamping pin into the sleeve.

• Fig. 1 eine schematische Seitenansicht einer erfindungs­gemäßen Rollen-Abwickelvorrichtung mit in der Eingangsposition befindlicher Rolle,
• Fig. 2 eine Draufsicht auf die Zuführvorrichtung der Fig. 1,
• Fig. 3 eine Seitenansicht ähnlich Fig. 1 einer abgewan­delten Ausführungsform mit in Übergabeposition befindlicher Rolle,
• Fig. 4 eine Teilansicht der Zuführvorrichtung mit aufge­spannter Restrolle,
• Fig. 5 in einem Funktionsbild die Anordnung von Frei­laufkupplungen,
• Fig. 6 eine Ausführungsform einer Kraftmeßvorrichtung,
• Fig. 7 eine Draufsicht auf die Rolle mit einem Spann­zapfen kurz vor der Einführung in die Hülse,
• Fig. 8 eine Draufsicht auf die Rolle mit horizontaler Parallelverschiebung,
• Fig. 9 eine Draufsicht auf die Rolle mit Drehung um eine vertikale Achse,
• Fig. 10 eine Vorderansicht einer konischen Rolle vor dem Ausrichten,
• Fig. 11 eine Vorderansicht der konischen Rolle nach dem Ausrichten,
• Fig. 12 eine Vorderansicht einer Restrolle beim Abnehmen,
• Fig. 13 eine weitere Ausführungsform in der Seitenansicht gemäß Fig. 1,
• Fig. 14 eine Draufsicht auf die Ausführungsform der Fig. 13,
• Fig. 15 eine schematische Ansicht von unten auf den zweiten Wagen der weiteren Ausführungsform,
• Fig. 16 eine Steuervorrichtung für die Luftkissen des Wagens der Fig. 15 und
• Fig. 17 eine abgewandelte Steuervorrichtung in zwei Stellungen.

The invention is explained in more detail below with reference to preferred exemplary embodiments illustrated in the drawing. Show it:

• 1 is a schematic side view of a roll unwinding device according to the invention with a roll in the initial position,
• 2 is a plan view of the feeder of FIG. 1,
• 3 is a side view similar to FIG. 1 of a modified embodiment with the roll in the transfer position,
• 4 shows a partial view of the feed device with the residual roll clamped on,
• 5 in a functional diagram the arrangement of one-way clutches,
• 6 shows an embodiment of a force measuring device,
• 7 is a plan view of the roll with a clamping pin shortly before insertion into the sleeve,
• 8 is a plan view of the roll with horizontal parallel displacement,
• 9 is a plan view of the roll with rotation about a vertical axis,
• 10 is a front view of a conical roller before alignment,
• 11 is a front view of the conical roller after alignment,
• 12 is a front view of a residual roll when removing,
• 13 shows a further embodiment in the side view according to FIG. 1,
• 14 is a plan view of the embodiment of FIG. 13,
• 15 is a schematic bottom view of the second carriage of the further embodiment,
• Fig. 16 shows a control device for the air cushion of the car of Figs. 15 and
• Fig. 17 shows a modified control device in two positions.

1 and 2, a roll carrier 1 is provided for feeding a roll 2. The roller carrier is formed by the troughed surface of a first carriage 3, that is to say a dump truck, which can be moved with its wheels 4 by motor on a track 5, in particular a rail track. This track has fixed sections 5a and 5b and a movable section 5c on a second carriage 6, a so-called loading carriage. With its wheels 7, the latter can be moved by motor on a track 8, in particular in turn a rail track. This consists of a section 8a on a lifting frame 9 and a section 8b on a pivoting element 10 which can be pivoted about a vertical axis 12 on the lifting frame 9 by means of a pivot bearing 11 and can be locked in its central position. The lifting frame 9 is supported at its four corners on four lifting elements 13 to 16, which are arranged in a stationary manner and can each consist of a hydraulic piston-cylinder unit.

The roll unwinding device has a frame 17, on which a rolling star 18 or 19, rotatable about an axis 20, is mounted on both sides. Each rolling star 18 has two arms 21 and 22, each of which carries a clamping pin 23 or 24 for engagement in the sleeve end 25 of a paper roll 2. In Fig. 1, the roll 2a, from which a paper web 26 is drawn, is almost used up. Therefore, a new roller 2 is fed to the clamping pin 23. The new roller 2 is then brought into the working position by rotating the unwinding star by 180 °.

• a) Mit Hilfe der Hubelemente 13 bis 16 ergibt sich eine vertikale Verlagerung S1.
• b) Mit Hilfe des ersten Wagens 1 ergibt sich eine Verla­gerung S2 parallel zur Spannzapfenachse.
• c) Mit Hilfe des zweiten Wagens 6 ergibt sich eine Be­wegung S3 senkrecht zur Spannzapfenachse.
• d) Mit Hilfe des Schwenkelementes 10 ergibt sich eine Drehbewegung S4 um die vertikale Achse 12 unterhalb der in der Aufnahmestellung befindlichen Spannzapfen 23.

The roller carrier 1 is accordingly movable in several respects relative to the clamping pins in the receiving position:

• a) With the help of the lifting elements 13 to 16 there is a vertical displacement S1.
• b) With the help of the first carriage 1 there is a displacement S2 parallel to the chucking pin axis.
• c) With the help of the second carriage 6 there is a movement S3 perpendicular to the clamping pin axis.
• d) With the aid of the swivel element 10, there is a rotary movement S4 about the vertical axis 12 below the clamping pin 23 located in the receiving position.

As will be explained in more detail later, the sleeve ends 25 are aligned with the clamping pins 23 using these four movement possibilities in such a way that the roller 2 is securely received by the clamping pins, as is illustrated in FIG. 3.

In the embodiment of FIG. 3, the track section 5c for the first carriage 103 rests on the second carriage 106 with the interposition of a gas cushion 110 or an air cushion. The lifting frame 109 does not require a pivoting element 10 because the gas cushion moves in the directions S1, S2 and S3 allows.

To remove the respective remaining roll, the roller carrier 1 is driven under this remaining roll by a motor and raised until it comes into contact. Then the clamping pins are removed and the remaining roll can be removed on the first carriage 3. If the diameter of the residual roll is smaller than the width of the arms 21, 22, it is received on a residual roll receiving surface 27 of the second carriage 6 and held by means of a clamp 28 when the clamping pins are pulled out. The receiving surface 27 has a slight inclination of, for example, 2 °, so that the residual roll 2b can roll under its own weight onto the roll carrier 1, that is to say the surface of the first carriage 3. On the opposite side of this first carriage 3 there is a roller stop device 29 which can be folded up if necessary.

Fig. 5 shows schematically that the carriages 3 and 6 each have a drive motor 30 and 31, each of which is connected to the associated carriage via a switchable one-way clutch 32 or 33. The clamping pins 23 have a drive 34. Whenever the command from a control device 35 to the drive 34 to push the clamping pin 23 into the sleeve, a switching command is simultaneously sent to the one-way clutches 32 and 33, as a result of which they are switched to free-running . While the carriages 3 and 6 are normally forcibly moved to certain coordinate points by their motors 30 and 31, they are disconnected from their motors after the switching command.

In the embodiment according to FIG. 3, the one-way clutches 32 and 33 can be omitted. Instead, there is a locking device, not shown, for the web section 5c, which can be fixed, for example, with locking pins on the second carriage 106. This locking device is released approximately simultaneously with the insertion of the clamping pins, so that the web section 5c can be moved on the gas cushion 110 in all three horizontal degrees of freedom.

FIG. 2 also shows that two opposing wheels 7 of the second carriage 6 are each assigned a force measuring device 36 or 37. The corresponding arrangement is explained in more detail in FIG. 6. The axis 38 of the wheel 7 is articulated to the cover plate 39 of the carriage 6. This top wall also carries the force measuring device 36, for example a conventional pressure cell. It is loaded by the axis 38 via a plunger 40. The force measuring device 36 therefore determines the wheel load of the second car.

As shown in FIG. 7, the clamping pins 23 have tapered end sections 41, which form an angle of 10 to 45 °, preferably approximately 40 °, with the clamping pin axis 42. If the roughly aligned clamping pin 23 is now pushed in with a force P1, the end section 41 abuts the end 25 of the sleeve 43, a force P2 being generated transversely to the feed direction. This force is used to effect the fine alignment of the sleeve 43.

The roller 1 can move freely in the horizontal direction because there is a possibility of free running in all degrees of freedom of movement. According to FIG. 8, forces P2, which are rectified, act on both sleeve ends. The roller 1 moves with the displacement of the second carriage 6 in the direction S3 perpendicular to the chucking pin axis. In FIG. 9, forces P2 act on both sleeve ends, which are opposite to each other. This leads to a rotation of the swivel element 10 in the direction of arrow S4. Movement parallel to the pin axis 42 by displacement of the first carriage 3 is also possible, namely if one clamping pin 23 touches the associated sleeve end 25 earlier than the other clamping pin. The insertion forces normally exerted on the clamping pins are sufficient for these alignment processes in the horizontal plane.

If there is a vertical deviation, the forces P2 are vertical. They therefore act against or with the weight of the roll. These force changes are measured with the aid of force measuring devices 36 and 37, of which at least one is provided on each side. 10, there is a decrease in force F- on the left and an increase in force F + on the right. This leads to a difference in force which must be eliminated by adjusting the lifting devices 13, 14 on the one hand and 15, 16 on the other hand. In the case of Fig. 10, the lifting frame 9 must be raised on the left side and lowered on the right side, so that the cone shape of the roller 1 is taken into account and a precise alignment of the clamping pin with the sleeve is achieved. The lifting devices are operated until the vertical changes in force are eliminated. As soon as the force measuring devices indicate that the additional vertical force components are no longer present, the clamping pins can be pneumatically inserted into the sleeve with normal operating pressure.

Fig. 12 shows that the force measuring devices 36 and 37 can also be used for the removal of a residual roller 2b. If the lifting frame 9 is moved vertically upwards and the roller carrier 1 contacts the remaining roller 2b, additional force components are measured. If these exceed a desired value 44, the associated comparator 45 sends a signal to the drive devices 34 in order to pull the clamping pins 23 out of the sleeve.

In operation, the procedure is as follows: A new paper roll 2 is fed with the help of the first carriage 3 via the web section 5a and is moved on the web section 5c of the second carriage 6 to the center of the unwinding device, an alignment with a permissible deviation of + / - 10 mm. The roll diameter is then determined using a measuring device 46. Then the second carriage 6 is moved to below the clamping pin 23 in the receiving position and is roughly adjusted in height with the aid of the lifting elements 13 to 16 on the basis of the diameter determined. Both movements can be done at high speed. Then the clamping pins are advanced, the clutches 32 and 33 switched to freewheeling and the swivel segment unlocked. The tapered end portions of the clamping pins exert forces on the sleeve ends, which in the horizontal plane directly leads to a shift of the roller 2 and in the vertical plane to a corresponding actuation of the lifting device until the sleeve ends are aligned so precisely that the clamping pins with normal Operating pressure can be retracted. Then the paper roll is raised somewhat by the rolling star, so that the roll carrier 1 can be moved back again. Roll 1 is then prepared so that it can take up the working position if necessary.

To remove the remaining roll, the roll carrier 1 is moved under the remaining roll. Then it is raised until the force measuring devices 36, 37 report the contact. Then the clamping pins are pulled out and the remaining roll is transported away on the first carriage 3. Of course, the touch of the remaining roll can also be determined in another way, for example by means of a push button switch.

13 to 15, the same reference numerals are used for the same parts as in FIGS. 1 to 12. Reference numbers increased by 200 are used for corresponding parts. The lifting frame is formed by a scissor lifting table 209, the scissors 50 arranged on both sides ensure that this lifting table 209 is always displaced in parallel when the height is adjusted by lifting elements 215. The second carriage 206 can be moved on air cushions 207 over the surface of the lifting table 209. A belt 51, which is placed around a non-driven pulley 52 and a pulley 54 driven by a motor 53, serves as the drive.

These air cushions 207, which also act as a gas cushion, have a triple function. They allow the second carriage to be moved with little friction from the illustrated starting position into the receiving position, in which the clamping pins 23 can receive a roller 2, and back. Secondly, the second carriage 206 and thus also the roller 2 supported on it can move freely in the horizontal plane to a sufficient extent so that when the tapered end sections of the clamping pins are inserted into the roller sleeve, they are corresponding Has freedom of movement. Third, the air cushion can be used to adjust the altitude to a certain extent. Therefore, after measuring the roll diameter, the lifting table 209 can be set by means of the measuring device 46 so that the roll axis comes to lie approximately 5 mm above the clamping pin axis. If the clamping pins 23 are then loaded in the direction of insertion and at the same time the air cushions lower them, the pins can be pushed into the sleeve largely without force.

This can be done in detail as shown in FIGS. 15 and 16. A height sensor device 55, as is known in principle from EP-A-0 148 502, is assigned to each air cushion 207. A button 56 pressed resiliently against the lifting table 209 actuates a plunger 57 with two resilient contacts 58 and 59, which interact with two limit switches 60 and 61 and actuate a control circuit 62 such that the second carriage 206 is at a constant height above the lifting table 209 is held. The control circuit 62 supplies a control pressure to a pressure reducing valve 63, the output pressure of which is supplied to the air cushion 207. This pressure prevails in the interior 64 of the air cushion 207 and, as a result of the outlet openings 65, also in the cushion space 66. The air then flows out through the gap 67. If the carriage 206 drops so that the limit switch 61 is actuated, the control pressure of the control circuit 62 is increased, the height of the carriage 206 increases so that both limit switches 60 and 61 are no longer contacted, the control pressure of the control circuit 62 drops mechanical supports 68 are provided in the event of pressure shutdown or pressure failure.

A compressed air source 69 supplies compressed air via an on-off switching valve 70. A pressure reducing valve 71 follows, the control pressure of which can be changed by means of a remotely controllable setpoint adjustment device 72. The output line 73 serves to supply the two left air cushions 207. The second of these air cushions is provided with a sensor device 55 and a pressure reducing valve 63 in the same way as the air cushion illustrated. However, these two air cushions can also be operated via a common pressure reducing valve 63 and a common height sensor device 55. The two right air cushions 207 are connected via their own pressure reducing valves 63 and a common pressure reducing valve 71 to a line 74 which goes out behind the switching valve 70.

When the rolls are handed over, the height of the lifting table 209 is adjusted so that, taking into account the normal height of the second carriage 206, the roll axis is approximately 5 mm above the pin axis. While the pins 23 are loaded in the direction of insertion, the pressure on both sides is slowly reduced with the aid of the remotely controllable setpoint adjustment device 72, which leads to a corresponding drop in the second carriage 206 and thus the roller axis. The lowering begins with the most heavily loaded air cushion. During this lowering movement, the clamping pins 23 can retract freely. If this is done on one side, the associated air cushions are relieved. This automatically starts the lowering process on the side that has not yet been retracted. One can therefore preferably use the upstream pressure reducing valve 71 for one Actuate the wagon side and later the one for the other wagon side. With symmetrical load distribution, the lowering and retraction of the clamping pins can also take place simultaneously.

The lowering process can be controlled in speed by the setpoint adjustment device 72, e.g. from maximum to minimum in 18 seconds, and can also be interrupted at any time. The lowering path can be interrupted in any case if limit switches 75 indicate that a ground clearance of e.g. 5 mm was reached.

While in FIGS. 15 and 16 the change in height during the insertion of the pin was carried out by lowering the pressure, in the exemplary embodiment in FIG. 17 this is done by a path-controlled lowering. For this purpose, the entire height sensor device 55 is not fixedly attached to the carriage 206, but rather to a lever 76 which is articulated to this. The lever is provided with a nut 77 which can be adjusted with the aid of a motor 78 along a spindle 79, for example from the position in FIG. 17 on the left to the position in FIG. 17 on the right. This shifts the height of the second carriage 206 by the amount D. By actuating the motor 78, the lowering movement desired for the insertion of the clamping pins 23 can therefore be brought about.

There can be deviations from the illustrated embodiments in many ways without departing from the basic idea of the invention. For example, the vertical pivot axis 12 can also be arranged on one side of the lifting frame 9. The stroke can be adjusted by an electric motor or mechanically. Other known load cells, for example with strain gauges, can also be used instead of the pressure load cells. The carriages that can be moved on a track can also be formed by slides or other supports that can be moved on runners.

Claims (28)

1. Roll unwinding device, in particular for a printing press, with a roll holding device which has two clamping pins which can be displaced relative to one another by a drive for engaging in a sleeve of the roll, and with a roll feed device which has a roll carrier which is operated by means of a lifting device Adjustable in height and on which the roller can be moved between the clamping pins, in particular by means of a first carriage which can be moved parallel to the clamping pin axis and by means of a second carriage which can be moved perpendicular to the clamping pin axis, characterized in that the clamping pins (23, 24) tapering end sections ( 41) and the roller carrier (1) is freely movable in at least one horizontal degree of freedom of movement when the clamping pin is inserted into the sleeve (43), so that the sleeve is automatically aligned with the clamping pin during this insertion. 2. Device according to claim 1, characterized in that the roller carrier (1) is pivotable in the horizontal plane when inserting the clamping pin (23, 24). 3. Apparatus according to claim 2, characterized in that the roller carrier (1) on a pivot element (10) about a vertical axis of rotation (12) is pivotable. 4. Device according to one of claims 1 to 3, characterized in that the roller carrier (1) when inserting the clamping pin (23, 24) in all three horizontal degrees of freedom of movement, namely displacement parallel to the clamping pin axis (42), displacement perpendicular to the clamping pin axis and pivoting is kept freely movable about a vertical axis of rotation (12). 5. Device according to one of claims 1 to 4, characterized in that a one-way clutch (32, 33) is connected between the first and / or second carriage (3, 6) and the associated motor (30, 31). 6. Device according to one of claims 1 to 5, characterized in that the roller carrier (1) when inserting the clamping pin (23, 24) is supported on at least one gas cushion (110, 207). 7. Device according to one of claims 1 to 6, characterized in that the first and / or second carriage (206) on air cushions (207) is movable. 8. The device according to claim 7, characterized in that the second carriage (206) has four air cushions (207) which are arranged at the corners of a rectangle. 9. Device according to one of claims 1 to 8, characterized in that the lifting device is arranged stationary and a lifting frame (9) is adjusted in height and that the second carriage (6) on the lifting frame and the first carriage (3) on the second carriage is movable. 10. The device according to claim 9, characterized in that the pivot element (10) arranged in the path of the second carriage (6) and a the axis of rotation (12) forming the bearing on the lifting frame (9) below the clamping pin (23 ) is arranged. 11. The device according to claim 6 and 9, characterized in that the gas cushion (110) is arranged on the second carriage (106) and carries a track section (5c) for the first carriage (103). 12. Device according to one of claims 1 to 11, characterized in that the roller carrier (3) can be lowered when the tensioning pin (23, 24) is loaded in the insertion direction. 13. Device according to one of claims 1 to 12, characterized in that the lifting device has at least two lifting elements (13 - 16) which are arranged offset in the direction of the clamping pin axis (42) and are adjustable independently of one another. 14. The apparatus according to claim 13, characterized in that in the direction of the clamping pin axis (42) offset sides of the roller carrier (1) each have a force measuring device (36, 37) is assigned, depending on which the mutually offset lifting elements are adjustable. 15. The apparatus according to claim 14, characterized in that the force measuring device (36, 37) on each side consists of at least one measuring unit, each measuring a wheel load of the second carriage (6). 16. Device according to one of claims 13 to 15, characterized in that the lifting elements (13 - 16) for rough alignment in rapid traverse and for fine alignment by means of the force measuring devices (36, 37) can be actuated in creep speed. 17. Device according to one of claims 1 to 16, characterized in that the lifting device has gas cushions (207) arranged offset in the direction of the clamping pin axis, the gas pressure of which can be changed by means of a valve arrangement (63, 72). 18. The apparatus according to claim 17, characterized in that the gas cushions (207) are arranged on a lifting table (209) which remains horizontally aligned with height adjustment. 19. The apparatus according to claim 18, characterized in that the lifting table (209 is a scissor lifting table. 20. Device according to one of claims 17 to 19, characterized in that the valve arrangement has a pressure reducing valve (72) with an adjustable outlet pressure. 21. Device according to one of claims 17 to 19, characterized in that the valve arrangement has a height position controller (55, 62) whose setpoint is adjustable. 22. Device according to one of claims 1 to 21, characterized in that a roller diameter measuring device (46) is provided, depending on which the lifting device (13 - 16) can be actuated for rough height adjustment. 23. Device according to one of claims 14 to 22, characterized by a comparator (45) which receives force signals from the force measuring devices (36, 37) and actuates the trunnion drive (34) in the pull-out direction when an adjustable value is reached. 24. The device according to one of claims 1 to 23, characterized in that on the second carriage (6, 206) next to the track (5) for the first carriage (3) is a residual roll-receiving surface (27) which in the direction is inclined on the above-mentioned track and ends at the level of the roller carrier (1). 25. The device according to claim 24, characterized in that the residual roll receiving surface (27) is assigned a clamp (28) for clamping the remaining roll (26). 26. The apparatus of claim 24 or 25, characterized in that the second carriage (6) on the opposite roll receiving surface (27) opposite side of the web (5) for the first carriage (3) carries a roll stop device (29). 27. A method for inserting the clamping pin into the sleeve of a roll in a roll unwinding device according to one of claims 1 to 26, characterized in that the roller carrier is aligned roughly in height and that then for inserting the clamping pin into the sleeve the height of the Role carrier is changed. 28. The method according to claim 27, characterized in that the roller carrier is arranged at such a height that the sleeve axis is somewhat above the clamping pin axis, and that the roller carrier is then lowered to insert the clamping pin into the sleeve.

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