CN1328045C - Printing unit for imprinting markings on outer packaging tapes in the tobacco processing industry - Google Patents

Abstract

The invention relates to a printing device (23) for printing marks on outer packaging strips in the tobacco processing industry, in particular on cigarette paper strips (21) in a cigarette rod machine. The printing unit (23) should be capable of rapid interchange when there is a change in sheet format or a change in the printed image. This is achieved by a fastening device (86) with which the pre-assembled rollers (45, 46, 47) can be fastened together on the machine and can be detached therefrom. With the printing unit (23) described, new printing cylinders (45, 46) and/or impression cylinders (47) can be quickly disconnected from the machine and replaced by a new printing unit with pre-loaded cylinders.

Description

Printing unit for imprinting markings on outer packaging tapes in the tobacco processing industry

technical field

The invention relates to a printing device for printing markings on a strip of wrapper in the tobacco processing industry, especially a strip of cigarette paper in a cigarette rolling machine, which has at least one printing cylinder, which is connected to an opposite Pressure roller contact.

Background technique

On the outer packaging strip in the tobacco processing industry, for example, on the cigarette paper strip, marks (printed images) will be printed. They can be, for example, the cigarette brand itself, but it can also be the name of the manufacturer or other instructions. Carried out in so-called coilers for the continuous operation of rod-shaped articles, such as cigarettes, cigarillos, cigars, filters, or the like, by the rolling method. The winder comprises a correspondingly constructed printing unit, in which at least one active printing cylinder is in contact with a counter cylinder, the paper material to be printed passing between these cylinders. These printing cylinders run synchronously with the continuously moving paper stock, at least during printing.

A printing unit for a so-called double coiler is known from British Patent 327206, in which a strip of cigarette paper is printed with a total of three indicia by each of a printing cylinder. The two printing cylinders are then in contact with a counter cylinder, between which the strip of cigarette paper passes.

Contents of the invention

The object of the invention is to enable printing units of the above-mentioned type to be wound together quickly, so that, for example, complex installation and adjustment procedures of the printing cylinders are not necessary for changing the markings. Part of the task is to quickly adapt the length of the printing section to a changed cigarette length.

According to the invention, this is achieved by a fastening device with which the preassembled rollers can be fastened together on the machine and removed from the machine.

A particularly advantageous design of the present invention consists in that the printing cylinder and the pressure cylinder are supported in a releasably fixed bearing bracket on the machine, with which they form a bearing bracket that can be removed from the machine. under and units that can be installed on the machine. According to the invention, the bearing bracket has two bearing plates, between which a printing cylinder and, if applicable, a counterpressure cylinder are arranged. The above-described structural design of the invention allows the entire printing unit to be disconnected from the machine and fitted with a new printing unit virtually "at once".

In a further development of the invention, the pressure roller is rotatably mounted on a shaft and can be driven by an electric drive. The fastening device can be mechanically connected with the bearing frame and fastened on the machine with one end. At the same time, the fastening device can have a pin bearing the bearing bracket, which can be fastened at one end in the machine wall. On its other end, according to the invention, the pin has a handle for removing or fastening the bearing bracket. Here the pins can pass through the holes in the bearing plate.

After a printing unit is removed from the machine and a new printing unit with preassembled printing cylinders and pressure cylinders is installed on the machine, the printing cylinders must be opposite to each other due to a change in paper format or a change in marking. There is a certain corner position on the machine. According to another embodiment of the present invention, a position-determined clutch can be provided between the drive and the printing cylinder, so that after a new pre-assembled printing cylinder unit/counter cylinder unit is printed, the printing cylinder occupies the position of the machine. A predetermined corner location.

The printing cylinder and the pressure cylinder must be relatively fixed in a certain position in order to obtain the best printing quality. Here, according to the invention, an adjusting device can be provided for finely adjusting the position of the pressure cylinder relative to the printing cylinder. The adjustment can support an elastically deflecting bearing element, such as a rubber boot.

The invention is particularly suitable for a printing unit in which two printing cylinders are in contact with a counter-pressure cylinder and the sheet conveyed between them, since in this case the pre-assembly method, ie the assembly and adjustment are kept away from the Machines are especially advantageous. When the printing marks and/or the length of the printing section are changed, the printing unit is adapted by simply exchanging a printing unit with a new pre-installed cylinder.

A particularly advantageous development of the inventive invention is characterized by a drive motor for the printing cylinder and a control device for outputting control pulses of the drive motor, so that the rotational speed of the printing cylinder between printing processes and The speed at the time of printing (printing speed) is different. With such a printing device, the length of the printing section on a continuously moving paper material can be changed quickly and easily without interfering with the reduction ratio of the reduction gearbox. This development of the invention is likewise particularly suitable for printing units having two or more printing cylinders in contact with a counterpressure cylinder. A particularly suitable embodiment of a printing unit operating with non-uniform motion is characterized by a stepping motor for driving the printing cylinder and a control device for emitting control pulses for the stepping motor, the control pulses being The stepper motor is fed to the printing element during a synchronous movement of the printing cylinder with the paper at a constant frequency during the printing process and when a different movement with a different frequency occurs between two printing processes.

A setting device can be provided for varying the frequency of the control pulses between two printing processes. The control device can have a memory in which a predetermined profile of the frequency is stored.

A partition wall can be provided in the intermediate space between the delivery devices for feeding the printing liquid to the individual printing cylinders, which prevents the printing ink sprays for one printing cylinder from reaching the other printing cylinder.

The invention is suitable not only for a part of a single-rod cigarette machine, but also for a part of a so-called double-rod machine in which two tobacco rods are formed and further processed into cigarettes.

The present invention has multiple advantages:

For example, when changing the printing mark, a new mark with a new printing image must be printed on the cigarette paper strip. At this time, changing the printing device can be easily realized, so that the pin is unclamped with a handle and removed. The bearing bracket is replaced with another pre-assembled bearing bracket that slides easily and is held in place by a corresponding pin. Position-dependent positioning is achieved via a position-determined clutch. After removal, if necessary, the printing cylinder and possibly also the counterpressure cylinder can be replaced and adjusted outside the machine, which is still running with a new printing unit, without interrupting production. The relative position of the pressure cylinders of the printing cylinders can be corrected to a small extent by means of the adjusting device. If the printing cylinder is not driven uniformly so that the peripheral speed varies periodically, the length of the printing section on the paper material can be changed rapidly, for example when the length of a cigarette is to be changed.

Description of drawings

The present invention will be described in detail below based on an embodiment. Shown as:

Figure 1: A three-dimensional schematic view of a cigarette rolling machine;

Figure 2: Perspective view of one of the printing units in the machine shown in Figure 1, showing the control system on an enlarged scale;

Figure 3: Front view of the printing device shown in Figure 2;

Figures 4 and 5: Schematic diagrams of control characteristic curves for non-uniform drive of printing cylinders.

Detailed ways

Fig. 1 shows a kind of well-known patentee's model in the tobacco industry is PROTOS cigarette rolling machine. From the gate 1 the tobacco fibers are fed to the pre-distributor 2 in portions. A take-up drum 3 of the pre-distributor 2 replenishes the tobacco in the storage bin in a controlled manner, from which a steeply inclined conveyor 5 removes the tobacco and delivers it to an accumulation well 6 in a controlled manner. A rod-shaped drum 7 draws a uniform flow of tobacco from the accumulation well 6, and an oscillating roller 8 knocks the tobacco off the rod of the rod-shaped drum 7 and throws it onto a disperser 9 rotating at a constant speed. superior. The tobacco cilia formed on this spread 9 are thrown into a viewing device 11 consisting essentially of an air curtain through which the larger or heavier tobacco fractions pass, while all other tobacco fractions are covered by air. Pour into a funnel 14 formed by a rod-shaped drum 12 and a wall 13 . The tobacco fiber in a tobacco channel 16 is just thrown to a continuous conveyor 17 by the rod-shaped cylinder 12, and the tobacco is kept on this conveyor by means of the air sucked into the negative pressure chamber 18 and shakes the tobacco fiber strips away. A smoothing device 19 removes excess tobacco from the tobacco fiber rod, which is then placed on a synchronously moving cigarette paper wrapping rod 21 . A strip of cigarette paper 21 is drawn from a reel 22 and passed through a printing unit 23 onto a driven format belt 24 . This format belt 24 transports the tobacco rod and the cigarette paper rod 21 through a format 26, in which the cigarette paper rod 21 is folded around the tobacco rod, thereby also protruding from an edge, which is just covered with a not shown The glue application device applies glue in a known manner. The adhesive seam is then sealed and dried by an in-line seam plate 27 . The cigarette rod 28 thus formed passes through a rod compactness measuring device 29 controlling the leveling device 19 and is formed into double-length cigarette rods 32 by a cutter device 31 . This double-length cigarette 32 is just transferred to a receiving drum 36 of a filter tipping machine 37 by a transfer device 34 with a controllable handle 33, and they use a disc on the cutting drum 38 of this filter tipping machine. Knife cuts into individual cigarettes. Conveying belts 39, 41 transport excess tobacco to a container 42 arranged under the storage bin 4, and the returned tobacco is taken out from this container 42 again by the large inclination conveyor 5.

2 and 3 show a printing unit 23 with two rotating printing cylinders 45 , 46 and a counter cylinder 47 . The two printing cylinders 45, 46 are in contact with a counter cylinder 47, between which the paper material in the form of the cigarette wrapping 21 passes continuously. The printing cylinder receives material to be printed on, such as printing liquid such as liquid ink, from a feeder not shown onto the protrusions 98 or grooves and makes it appear in the form of a printed mark on the cigarette paper 21 on. The printed indicia may be a printed image of a cigarette brand, company logo, or other indicia. The printing cylinder 45 or 46 driven by the machine drive or synchronously driven by the motor 48, 49 and the cigarette paper 21 is supported in a bearing bracket 51, which is mainly composed of two bearing plates or mounting plates 52, 53, They are kept at a distance by spacer pins 54 . The electric motor is controlled by a control unit 201 which interacts with a memory 202 and a host control unit 200 in a manner which will be described further below.

In FIG. 3, a front mounting plate 52 has been removed. The printing cylinders 45, 46 and the shaft 56 of the electric motor 48 or 49 (not shown) are connected to each other by a clutch 58, 59 which is positively connected by the position, so that the printing cylinders 45, 46 can be connected with the motor fastened on the machine. The shafts of 48 or 49 are axially separated. When pushed on again, they occupy their predetermined position relative to the cigarette rolling machine. Clutches of the type BK5/BK6 of the company R+W Transmission Components (Alaxander-Wiegand str. 8, 63911 Klingenberg, Germany) are suitable as clutches of the above-mentioned type.

In Fig. 2, the printing cylinder 46 and the motor 49 have been removed. The printing cylinders 45, 46 can move axially within a certain range against the action of the spring 64 by means of the adjusting screws 61, 62. The counterroller 47 is rotatably mounted on a shaft 79 so that it can be driven along with the material web 21 . The shaft 79 is supported in invisible rubber-elastic bushings in the mounting plates 52,53. The ends of the shaft 79 are fixed by spherical bushings 77 in supports 76 which can be moved slightly relative to the mounting plates 52, 53 by means of adjusting screws 71, 72. The counter-pressure cylinder 47 can thus be adjusted relative to the printing cylinders 45, 46 due to the deformation of the rubber-elastic bushing.

A fastening device 86 for making the bearing bracket 51 fastened to the machine wall 87 or detached from it has a pin 88 which passes through a hole 89 in the mounting plates 52, 53 and supports the bearing bracket 51. The end 88a of the pin 88 can be fastened to the machine wall 87 . On the other end 88b of the pin 88 there is a handle 92 for loosening and tightening the pin.

If a printing unit 23 is to be replaced, the pin 88 is disengaged from the machine wall 87 by turning the handle 92 and the printing unit, which can be fixed on a handle 66, is pulled out axially, wherein the shafts of the printing cylinders 45, 46 are aligned with each other. The shafts of the motor 48 or 49 are separated. A new printing unit 23, whose printing cylinders 45, 46 are advantageously pre-assembled and pre-adjusted, is then pushed up in the opposite manner, wherein the shaft of the printing cylinder and the motor shaft are form-closed at the clutch position connect them.

A continuously moving strip of material 21 (strip of cigarette paper) is printed by one or more synchronously driven printing cylinders in a known machine. This means that when changing sizes, in which the length of the cigarette is changed, the printing unit must be replaced. According to an inventive special embodiment of the invention, the length of the printing run can be adapted by changing the rotational speed of the printing unit between two printing processes which must be run synchronously. If the printing roll is driven faster between two simultaneous runs, the segment length is shortened, and vice versa. The way to realize this method is described below as an example based on the control device of the motor 48: the host control device 200 provides the control device 201 with a first beat signal synchronous with the continuous motion of the paper tape 21. This signal can have, for example, one clock pulse per millimeter of continuous movement of the strip and only slow frequency changes, since it is coupled to the inertia of the main drive system of the machine. The control unit sends a second clock signal to an electric motor 48 designed as a stepping motor, which rotates one step per clock pulse of the second signal. For example, the motor can make a full revolution every 1000 clock pulses. The control device 201 has a frequency multiplier 204 known per se, which outputs a clock signal of the third type which is synchronized to the clock signal of the first type, for example with a thousand times frequency. If a likewise known counter has registered a predeterminable number of clock pulses, called factors, of a third clock signal, this third clock signal is fed to a counter 203 .

In a simple example the printing cylinder 45 has a circumference of 130 mm and the printing unit 23 is used to print images on the material web 21 at a pitch of 130 mm. During about 130mm of paper tape transportation, this host control device 200 just sends 130 beat pulses of the first kind of beat signal to the control device 201, and the frequency multiplier 204 thus produces 130000 beat pulses of the third kind of beat signal. Predetermined as 130 to counter 203 as factor, thus when the third kind of clock signal is 130000 clock pulses, it just sends 1000 clock pulses of the second kind of clock signal to the motor and makes this motor turn a full circle. Synchronization is always maintained between the printing cylinder 45 and the paper strip 21 at this time.

In another example, the printed image is applied to the paper strip 21 by means of the printing unit 23 at a pitch of less than 130 mm. For this purpose, a digital characteristic curve 300 is stored in memory 202 , as shown in FIG. 4 . On axis 301 the location of the memory point is marked, on axis 302 the value of the factor stored in this memory point is marked. With each clock pulse of the first clock signal, the next value of the factor is read from the memory and passed to the counter 203 . The value of the dispenser corresponds to the value 303 when the bump 98 on the printing cylinder 45 acts on the paper strip, running synchronously, eg 130. After the protuberance 98 leaves the paper strip 21, the lower value of the factor is forwarded to the counter 203, so that the frequency of the second clock signal and thus the rotational speed of the motor 48 and the printing cylinder 45 are increased. The factor value then decreases with a gentle ramp, so that the motor is only subjected to a small acceleration torque. After approximately half a turn of the motor 48, the factor value is slowly increased again until it synchronously reaches the value 303 again before the bump 98 acts on the paper strip again.

After completing one revolution (line 304) the motor 48 sends a signal to the memory 202, and then the first memory point reads the factor value.

In order to print on the paper strip 21 printing marks with a separation distance greater than 130 mm, another characteristic curve 310 of the factor value is stored in the memory 202, which has a higher ratio than synchronously when the bump 98 acts outside the paper strip 21. high factor value. Figure 5 shows such a characteristic curve. Components of FIG. 5 correspond to those of FIG. 4 and are numbered 10 higher. In a printing unit with several printing cylinders, each printing cylinder can be provided with a control unit with a memory 202 .

The components 200 to 204 in FIG. 2 are functional components and can be implemented in software of an automatic control device or a control computer.

Claims (12)

1. the printing equipment that is used for typographic(al) mark on the external packing band of the tobacco industry, it has a printing cylinder at least, this cylinder contacts pressure roller with one, it is characterized by a fastener (86), can make the cylinder (45 of prepackage with this fastener, 46,47) be fixed on together on the machine (87), and can disassemble from machine; At drive unit (48,49) and printing cylinder (45,46) be provided with the clutch (58,59) that a position is determined between, make that this printing cylinder has just occupied a predetermined angle position in machine after installing the printing cylinder parts of a new prepackage/to the pressure roller assembly of elements.

2. by the described printing equipment of claim 1, it is characterized in that, printing cylinder (45,46) and to pressure roller (47) be bearing in bearing mounting (a 51) lining that removably is fastened on the machine (87), they have just constituted one and can take off and can be contained in assembly of elements on the machine from machine with this mounting.

3. by the described printing equipment of claim 2, it is characterized in that the bearing mounting has two shaft bearing plates (52,53), printing cylinder (45,46) is placed between them.

4. by the described printing equipment of claim 1, it is characterized in that, pressure roller (47) is bearing on the axle (79) free to rotately; And this printing cylinder (45,46) can be driven by a Vidacare corp (48,49).

5. by the described printing equipment of claim 1, it is characterized in that, fastener (86) and bearing mounting (51) mechanical connection, and can be fixed on the machine (87) with an end.

6. by the described printing equipment of claim 5, it is characterized in that fastener has a pin (88) that supports bearing mounting (51), it at one end (88a) can tighten and be fixed on a machine wall plate (87) lining.

7. by the described printing equipment of claim 6, it is characterized in that pin (88) has a handle (98) to be used to unclamp or fastening this bearing mounting (51) at its other end (88b).

8. by claim 6 or 7 described printing equipments, it is characterized in that pin (88) passes the hole (89) on the shaft bearing plate (52,53).

9. by the described printing equipment of claim 1, it is characterized by an adjusting device (71,72), it is used for adjusting minutely to the position of pressure roller (47) with respect to printing cylinder (45,46).

10. by the described printing equipment of claim 9, it is characterized in that a adjusting device with one or more bolts.

11. by the described printing equipment of claim 9, it is characterized in that a kind of bearing element that is used for the elastic deflection of the axle (79) of pressure roller (47), it can be used to realize a kind of little adjustment campaign.

12. by the described printing equipment of claim 1, it is characterized in that, pressure roller (47) disposed two or more printing cylinders (45,46).

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