The invention relates to a drive
for a printing press
according to the preamble of claim 1.
In DE 197 23 147 A1
describes a device for driving a printing press with an integrated imaging device, in which each printing plate cylinder is assigned its own drive in order to achieve a high imaging speed. Each with an axially acting phase position clutch, the printing form cylinders are separated from the drive wheel train and driven by the self-propulsion in imaging mode with an imaging speed that is above the maximum printing speed. The phase couplings each couple or decouple a gear wheel, which is rotatably arranged on an axis of the printing form cylinder, with or from the axis of the printing form cylinder. There is a uniform gear train in the print image for each printing unit or across the entire printing press, in which the rollers of the inking units are also integrated. The inking units run in the imaging mode and in the printing mode, which is sometimes undesirable. In order to decouple inking units from a drive wheel train, additional couplings must be provided.
In DE 42 23 583 A1
describes a printing press in which the printing form cylinders can be rotated independently of one another into any position for the purpose of changing the printing plate with a separate drive. To make this possible, couplings are provided between a continuous gear train and the respective printing form cylinder. After changing the printing plates, the printing form cylinders are brought into a position required for the printing operation.
At the in DE 195 15 077 A1
The disclosed method for influencing the ink acceptance behavior uses a printing press in which the drive of an inking unit starting from the printing unit cylinders is interrupted at a coupling point on the axis of an inking roller, so that the inking unit does not run dry during an imaging process due to overheating. In imaging mode, the printing form cylinders are driven by the same gear train as in printing mode. When printing, the drive of the inking unit is incorporated in the drive wheel train emanating from the printing unit cylinders, so that the inking units run unnecessarily in non-printing inking units.
The drive for a sheet printing machine after DE 196 40 649 A1
contains switching clutches in the individual printing units, which make it possible for the printing form cylinders to be freely rotatable relative to the cylinders interacting with them with assigned drives. Frictional or form-fitting clutches are used as shifting clutches, which in the coupled state bring about a sufficiently rotationally fixed connection between the plate or forme cylinder and the cylinder body. The clutches are designed as index clutches that only allow the parts to be coupled when they are in a relative position. The free rotation of the printing form cylinders can be used when changing the printing plate, during pre-inking and pre-dampening of inking unit rollers, when cleaning the printing unit cylinders and when imaging and deleting printing formes. In one variant, rollers of the inking and dampening unit can be driven together with the printing form cylinder. Drives for the printing form cylinders can be used directly or via a reduction gear coupled position-controlled motors which rotate freely during printing or are energized to achieve a constant tooth flank system for applying a braking torque. Additional shifting clutches can be provided in the gear train for coupling the drives for the printing form cylinders, so that the drives can be completely stopped during printing.
One in DE 101 06 412 A1
Described device for decoupling / coupling a machine component, such as. B. a printing cylinder, on a printing press contains an actuator with the slotted actuating elements in the radial direction of the rotatable machine component engage in unevenly distributed recesses of a transmission element. A slider with bevels arranged coaxially to the machine component is provided as the actuator for the slotted actuating elements, the slotted actuating elements being seated on a bevel and moving radially when the slider is axially displaced.
For the drives according to the status
In the art, axially acting phase couplings are used
designed as controllable clutches with positive locking of the coupling halves
are. These are tooth couplings with an uneven tooth pitch,
so the coupling halves
only engage in a predetermined rotational position. The production
such a coupling is material and cost intensive. Through manufacturing-related
Tolerances exist inaccuracies regarding the rotational position
the coupling halves
to each other. With a large number of coupling processes, the inaccuracies increase
due to wear of the
elements securing the phase position.
The object of the invention is a
to develop a printing press in which the accuracy and the
improved when engaging and disengaging driven elements
The task is done with a drive
having the features of claim 1. Advantageous configurations
result from the subclaims.
By providing a clutch In which the functions of torque transmission and securing the rotational angle position of the parts to be coupled are distributed over different elements, parts can be used which are simple to manufacture and which have a long service life. The elements securing the angular position are subject to almost no wear, which promotes accuracy.
The invention is based on exemplary embodiments
will show it:
1 : a diagram of a drive wheel train of a printing unit of a printing press,
2 : a variant for a coupling with an axially movable index bolt and friction elements,
3 : a variant for a tooth coupling with radially movable index elements,
4 : a variant for a tooth coupling with an additional index device, and
5 and 6 : a scheme for coupling two sprockets.
In 1 A drive wheel train of a printing unit of an offset printing machine is shown. It is an offset printing machine that can be converted from printing to imaging by means of couplings. The motor shaft 1 a main drive motor 2 is with a first gear 3 a main drive gear train 4 coupled. The main drive gear train 4 includes an impression cylinder drive gear 5 , a transfer cylinder drive gear 6 , a double gear 7 consisting of single gears 8th . 9 and a gear 10 for driving an inking unit. The impression cylinder drive gear 5 and the transfer cylinder drive gear 6 sit rotatably on the axles 11 . 12 of a printing cylinder 13 and a transfer cylinder 14 , The double gear 7 sits on the axle 15 a printing form cylinder 16 , By means of a clutch K, a non-rotatable connection between the double gear can be selected 7 and the axis 15 getting produced. The gear 10 sits rotatably on an axis 17 an inking roller 18 , The motor shaft 19 a power take-off engine 20 is with a gear 21 a PTO train 22 coupled. The PTO train 22 includes a gear 23 , which is rotatably on the axis 15 is arranged and with the gear 21 is engaged. The power take-off engine 20 is independent of the main drive motor 2 drivable.
The double gearwheel engages in printing operation with the clutch K 7 rotatable with the axis 15 connected. According to the number of prints to be generated per unit of time, the main drive motor 2 controlled while the power take-off 20 is out of operation or is controlled to feed in a braking torque ensuring the tooth flank system or an additional torque reducing vibrations. During the rotation of the cylinders 13 . 14 . 16 and the inking roller 18 becomes one on the printing form cylinder 16 arranged printing form 24 colored and the color over the transfer cylinder 14 on a bow 25 transferred to the impression cylinder 13 is held.
In the imaging mode, the clutch K is released, so that no torque transmission between the double gear 7 and the axis 15 can take place. The printing form cylinder is driven in the imaging mode 16 by means of the power take-off engine 20 while the main drive motor 2 is stopped. This prevents disturbing vibrations from the main drive gear train 4 on the system consisting of an imaging arrangement and a rotating printing form cylinder 16 , With the power take-off engine 20 is about the gears 21 . 23 the printing form cylinder 16 brought to imaging speed. During the rotation of the printing form cylinder 16 the imaging arrangement is actuated in accordance with the image, so that ink-accepting pixels on a printing form blank 24 arise on the outer surface of the printing form cylinder 16 is held.
To maintain register accuracy in a multicolour offset printing press, it is necessary for the clutch K to have the double gear in the correct phase and without play 7 with the axis 15 couples. Suitable couplings are described below. Insofar as the elements described below have the same function as already for 1 described elements, these elements are named with the same reference numerals.
2 shows a clutch K on a journal 26 a printing form cylinder 16 , On the journal 26 is with bearings 27 . 28 a double gear 7 held. In the journal 26 are in holes 29 . 30 , a supporting body 31 and a working piston connected to it 32 arranged. The holes 29 . 30 give the supporting body 31 and the working piston 32 a guide in the radial direction 33 , The working piston 32 and a connecting rod 34 to the supporting body 31 are against the holes 29 . 30 with seals 35 . 36 fitted. The hole 30 stands with an axial bore 37 in connection. The hole 37 leads to a stationary compressed air system via a rotating union. On the support body 31 is a friction lining 38 attached to the outside the shape of an inner wall 39 one turn 40 of the double gear 7 having. The supporting body 31 is T-shaped in cross section, with compression springs below the projections lying in the axial direction 41 . 42 are arranged on the projections and on the journal 26 are anchored. The supporting body 31 with the friction lining 38 is located in the axial direction between the bearings 27 . 28 that with circlips 43 - 46 against displacement on the axle journal 26 are fixed. More circlips 47 - 50 to the side of the camp 27 . 28 prevent axial displacement of the double gear 7 , The double gear 7 is bell-shaped and encloses the axle journal 26 at the front 51 , On the front 51 gegenü overlying area of the double gear 7 is at a distance a from the axis of rotation 42 of the printing form cylinder 16 an axially movable index bolt 53 arranged. Also at a distance a is in the journal 26 an axially extending index hole 54 to hold the index bolt 53 , As an actuator for the index bolt 53 is a winding 55 of an electromagnet in the double gear 7 arranged. The winding 55 stands with a slip ring 56 and stationary sliding contacts 57 in connection.
The representation in 2 shows above and below the axis of rotation 52 different switch positions of the friction lining 38 and the index bolt 53 ,
In the illustration above the axis of rotation 52 is the friction lining 38 through the action of the working piston 32 from the inner wall 39 switched off. This is done with the compressed air system via the holes 37 . 30 Pressure p g on the working piston 32 exercised so that it extends in the radial direction 33 emotional. By coupling with the connecting rod 34 becomes the supporting body 31 with the friction lining 38 against the force of the compression springs 41 . 42 from the inner wall 39 moved away. Furthermore, the winding 55 via the sliding contact 57 and the slip ring 56 flowed through by current, so that a magnetic field is created which is the index bolt 53 from the index hole 54 draws. This is the double gear 7 free on the journal 26 rotatable. The printing form cylinder 16 has no drive connection to the main drive gear train 4 and can't over in 2 shown gear technology means are driven separately for the purpose of imaging.
In the representation of the 2 below the axis of rotation 52 is the friction lining 38 to the inner wall 39 hired. This is done with the compression springs 41 . 42 if there is no pressure p ü on the working piston 32 acts. Before the friction lining 38 to the inner wall 39 is turned on, the winding 55 switched off so that the index bolt 53 by the action of a spring, not shown, in the index hole 54 slides when the double gear 7 for the journal 26 has a rotational position that allows this. Because the index bolt 53 in the index hole 54 is the perfect fit, is the rotational position of the double gear 7 on the journal 26 secured with high precision. The compression springs 41 . 42 press the friction lining 38 with a normal force against the inner wall 39 , so that the friction forces ensure a safe transmission of the torques generated during printing. When printing, act on the index bolt 53 no shear forces, so the fit between the index bolt 53 and the index hole 55 is not affected.
3 shows above and below an axis of rotation 52 a printing form cylinder 16 further versions of clutches with radially acting index and torque transmission elements.
At the above the axis of rotation 52 shown variant is an index sleeve 58 on a journal 26 of a printing cylinder 16 , The index sleeve 58 is on a covenant 59 with screws 60 at the front 61 of the journal 26 non-rotatably attached. The index sleeve has on the outside 58 radial frusto-conical index holes 62 for receiving frustoconical index bolts 63 , The index bolts 63 are in the radial direction 64 movable in a bell-shaped rotating part 65 arranged. The turned part 65 sits by means of bearings 66 . 67 rotatable on the index sleeve 58 or on the journal 26 , On the turned part 65 is a pressure ring 68 added a bevel 69 has that with bevels 70 on the index bolt 63 correspond. On the pressure ring 68 is a bell-shaped double gear 7 added. On an inside waistband 71 supports itself in the axial direction against the pressure ring 68 a return spring 72 from. One on the double gear 7 attached leaf spring 73 keeps the bevel 70 in constant attachment to the bevel 69 , Between the turned part 65 and the double gear 7 is a pressure chamber 74 educated. seals 75 . 76 cause a sealing of the pressure ring 68 against the inner wall of the double gear 7 and the outer wall of the rotating part 65 ,
When in pressure mode in the pressure chamber 74 a liquid or gas pressure is built up, then the pressure ring 68 against the force of the return spring 72 in the axial direction with its bevel 69 against the bevel 70 emotional. This will make the index bolt 63 towards the index sleeve 58 emotional. If the index bolt 63 an index hole 62 faces, then it snaps into the index hole 62 on. The index bolt 63 secures both the rotational position of the double gear 7 on the journal 26 as well as the torque transmission between the main drive train 4 and the printing form cylinder 16 ,
If in the imaging operation the pressure in the pressure chamber 74 is removed, then the pressure ring 68 with the return spring 72 from the journal 26 moved away. By shifting the bevel 69 on the outside there is free space for the movement of the index bolts 63 radially outwards with the help of the preloaded leaf spring 73 , If the index bolt 63 completely from the index hole 63 is raised, then there is no drive connection between the double gear 7 and journal 26 so that the printing form cylinder 16 can be driven separately for the purpose of imaging.
At the in 3 below the axis of rotation 52 shown variant are instead of the index bolts 63 roll 77 used with index holes 78 interact. The balls 77 lie against a bevel already described 69 a pressure ring 68 on. For constant contact with a ball 77 against the bevel 69 also serves a spring 79 , Otherwise this applies to the description of Variant with the index bolt 63 Said.
In 4 a tooth coupling with trapezoidal teeth for rough positioning of the coupling halves is shown. On a journal 26 a printing form cylinder 16 is similar 2 , a double gear 7 in camps 27 . 28 pivoted and with circlips 43 - 50 secured against moving. Between the camps 27 . 28 there is an index bolt 80 with a bunch 81 which is in a radial bore 82 is mobile. Is coaxial with the index bolt 80 a connecting rod 83 and a working piston 84 connected. The working piston 84 sits with a sealing ring 85 in a hole 86 , which is connected to an axially extending bore. The connecting rod 83 protrudes through a hole 88 , The seal 89 blocks the passage between the holes 87 and 82 , compression springs 90 . 91 grab the waistband 81 and are supported on the journal 26 from. The double gear 7 owns next to the gears 8th . 9 a front sprocket 92 with another sprocket 93 cooperates, which is on an axially movable ring 94 located. The ring 94 has a spline connection 95 to a support ring 96 with a feather key 97 non-rotatable on the journal 26 sitting. On the support ring 96 is a winding 98 attached to an electromagnet. The winding 98 is fed via a slip ring transformer, not shown.
When imaging, the double gear 7 from the journal 26 decoupled by the holes 87 . 86 be pressurized with compressed air. The pressure p u acts on the working piston 84 and causes this together with the connecting rod 83 and the index bolt 80 is moved in the radial direction so that the index bolt 80 from an index hole 99 is lifted into an inner wall of the double gear 7 is introduced. Furthermore, the winding is used for imaging 98 flowed through by the electric current, so that there is a magnetic field which is on the ring 94 acts. The ring 94 is going in the direction of the winding 98 pulled so that the teeth of the sprockets 92 . 93 disengage. This is the double gear 7 on the journal 26 freely rotatable.
The holes are used to switch to printing mode 86 . 87 kept depressurized. By the force of the spring 90 . 91 becomes the index bolt 80 moved radially outward. If the double gear 7 relative to the journal 26 is rotated, then the index bolt engages 80 at a given rotational position in the index hole 99 on. The diameter of the index bolt 80 is significantly smaller than the index hole 99 so that the rotational position of the double gear 7 only roughly through the game seat of the index bolt 80 in the index hole 99 is specified. After roughly positioning the double gear 7 the current through the winding 98 off. The ring gear 93 is in the spline connection 95 by the force of a spring, not shown, in the direction of the ring gear 92 emotional. The sprockets 92 . 93 have a uniform, trapezoidal division.
In the 5 and 6 is the coupling process of the two toothings of the ring gears 92 . 93 shown in more detail. At the beginning of the movement of the ring gear 93 in the axial direction 100 own the sprockets 92 . 93 an offset s in the circumferential direction, which is the maximum of the play between index bolts 80 and index hole 99 equivalent. When the sprocket is moved further 93 in the direction 100 run like in 5 shown the sloping flanks 101 . 102 the sprockets 93 . 92 on each other. Due to the wedge effect of the flanks 101 on the flanks 102 becomes the ring gear 92 in the circumferential direction 105 as part of the game between index bolts 80 and index holes 99 twisted in the circumferential direction until, as in 6 shown all tooth flanks 101 - 104 rest against each other without play. The engagement of the teeth of the sprockets 92 . 93 secures both the desired rotational position and the torque transmission. The index bolt 80 and the index hole 99 are used for prepositioning the double gear 7 , When coupling the sprockets 92 . 93 the same teeth and tooth gaps always come into engagement. As a result, the rotational position between the double gear and the journal 26 repeatable and precisely producible.
- motor shaft
- Main drive motor
- Pressure cylinder drive gear
- Transfer cylinder drive gear
- double gear
- Single gear
- pressure cylinder
- transfer cylinder
- Plate cylinder
- Inking roller
- motor shaft
- In addition to driving motor
- printing form
- supporting body
- working piston
- connecting rod
- friction lining
- inner wall
- compression spring
- axis of rotation
- Index bolts
- index hole
- slip ring
- sliding contact
- Index sleeve
- index hole
- Index bolts
- turned part
- pressure ring
- Return spring
- leaf spring
- pressure chamber
- index hole
- Index bolts
- connecting rod
- working piston
- compression spring
- Spline connection
- support ring
- Adjusting spring
- index hole
- tooth flank