DE2044664C3 - Control device for an automatic etching unit in an office offset machine - Google Patents

Description

** ■ ■ " ,; automatically ^

the application of the ^ ^

wears Λ ^^ Κ ^ Ϊ? fully automatic operation of an office

Offset machine for further er

Serving ™ The accompanying drawings ^he f ^{more "he"} explanation of the invention. Then ^ ¹

Fig. 1 a »^ ™ ™ ™ i" keitsauftragevornchtung according to an execution shape;

The invention relates to a control device of an automatic etching unit of an office offset machine with a locking device having Ras'elemente, which in the locked state an etching roller in the lifted state from the plate cylinder,. ^ stops and after releasing the At-roller to the system the plate cylinder releases, with locking and switching levers, springs and one with the plate cylinder circumferential cams for controlled application and lifting of the etching roller are available.

Such a control device is known (German, before utility model specification 1 962 533).

In the case of an offset printing machine that has an automatic fastening of successive and to If printing plates arranged on a printing plate feed table are stacked, it is also worth seeing the application of a printing ink The repellent etching liquid is automatically applied to the printing plate mounted on the plate cylinder

This is done with the control device known from the German utility model 1962 533 Positioning and lifting of the etching roller by means of a movable and rotatable control rail. the The control rail is controlled by means of a cam. To achieve the sliding movement and the rotary movement and the locking of the rail are relatively extensive and complicated Control devices necessary. In the German Auslegeschrift 1 283 249 is activated by pressing a Control unit manually put the etching liquid application device into operation. It is here so not an automatic control device for an etching unit

The object of the invention is to provide a control device for an automatic etching mechanism to create an office offset machine in which the etching liquid always comes into contact with the printing plate standing etching roller is fed when a new printing plate automatically aulf the Plate cylinder is attached.

ters for the Ätzfiässigkeit and the rollers can be seen

is;

F i g. 3 a lateral Te.lans.cht the ^ n F. ^ Ge

showed device, from the ^d « ^r « ⁿ ^^ 'J ™ of a Gre.farm and a locking member to which a solenoid is attached, can be seen v. approx

F i g. 4 is a side view of the FIG. ge: ze ^ ter Device from which its mode of operation emerges

goes; .

F i g. 5 is a perspective view of the FIG. 1

device shown. nnHn ™ «! ™>

From Fig. 1 is ers.cht.ch. that a ductor roller I is attached to the right above a plate at the bottom of the 4 printing press. A transfer roller 21 held in contact with the fountain roller 1 is rotatably supported by the side plate of the printing machine, not shown in the figure. The ductor roll 1 dips with | HREM lower Part I into an etching liquid, which in a trogairtigen part 6 a of a Ätzflüssigkeitsbehaltersö - is included - such as from visible Hg i.. The etching liquid container 6 is removably arranged on the printing machine. The Atzflüssigkeitsbehälter 6 contains a stored products ν c vessel 6, which is a b trogart.gen with the part 6 via tine opening 6 in compound. The Hussigkeite- "c is par of the etching liquid in the trough-like part 6 is kept constant b in the height of the upper edge of the Ottnung. 6 , · ■

The transfer roller 2 is normally a rubber roller. Furthermore, an etching flow support roller 3, which will be referred to below as A zwa ze 2 , is attached. The etching roller. is made by wrapping a cloth, a sponge, a tape or some other liquid-absorbing material 3 a around a metal roller. The surface of the etching roller 3 is kept in contact with the transfer roller 2 »

The etching roller 3 is attached to a shaft 8, wel

before rotatable by two arms Ta and 7b - like au;

Fig. 5 can be seen - is held, am Kettenradi

is attached to one end of the shaft 8, the front the arm 7 b worn .st. The arms 7 α and 7 b are sine

with its base fixedly attached to a shaft 10 which is rotatably supported by an immovable part, which is not shown in the figure. On one end part of the shaft 10, to which the base of the arm 7b is attached, a sleeve is loosely attached which carries a gear wheel 12, a chain wheel 13 and a drive wheel 14 provided with a toothing. The gear 12 is in engagement with a gear 15 which is fixed on a shaft 2 α of the transfer roller 2! is; a roller chain 16 shown in dash-dotted lines is wrapped around the chain wheels 9 and 13. A timing belt 20 is drawn around the drive wheel 14 and around a further drive wheel 17. The timing belt 20 is guided and tensioned by guide tubes 18 and 19. The drive wheel 17 is connected to a chain wheel 22 via an electromagnetic clutch 21. Another roller chain 24, shown in dash-dotted lines, is guided around the chain wheel 22 and another chain wheel 23. The sprocket 23 is fastened together with a gear 25 on a shaft. The gear 25 is connected to a gear 28 via intermediate gears 26, 27. The gear 28 is essentially firmly connected to the Tudu cylinder 5.

The plate cylinder rotates in the direction of arrow a. The blanket cylinder 5 thus rotates in the direction of arrow b while it is in contact with the plate cylinder 4. It also rotates the gear 28 in the direction of arrow b.

When a main switch, not shown, is actuated, the plate cylinder 4 and the blanket cylinder 5 begin to rotate in the directions mentioned and thus also the 2nd gear 28. The electromagnetic clutch 21 connects the sprocket 22 with the drive wheel IT for a certain time interval after a The timer, not shown, is operated by the main switch. The chain wheel 9 and the gear wheel 15 in this way cause the shafts 8 and la to rotate in the direction of the arrows c and d during the specific time interval. By rotating the shafts 8 and la in said directions it is achieved that the etching roller 3 in the direction of arrow c, the transfer roller 2 in the direction of arrow d and the ductor roller 1 rotate in the direction of arrow e , while the etching roller 3 in Press contact with the transfer roller 2 is held.

Of the ink fountain roller 1, the etching liquid is transferred to the liquid absorbing material layer 3 a of the etching roller 3 on the transfer roller 2, while these rolls rotate. The layer 3 α of the etching roller 3 is soaked in this way with the etching liquid. As soon as the above timer drops, the electromagnetic clutch 21 is disconnected. Then only the gears 28, 27, 26 and 25 and the chain wheels 23 and 22 rotate.

A gripper 29 is - as can be seen from Fig. 5 - firmly attached to the end of the shaft 10, to which the arm 7b is also attached. The gripping arm 29 has a bent part 29 β at its front end. A pawl 30, which is loosely attached to a shaft 31, is designed with its front end in the form of a hook 30 α . The hook 30 α can come into engagement with the bent end 29 α of the gripping arm 24 ·. A rocker arm 32 is also loosely attached to the axis 31.

An arm 32 ″ of the rocker arm 32 is connected via a pin 35 to a connecting arm 34 which is pivotably attached at one end to an armature 33 β of a lifting magnet 33. At one EmiJe of the pawl 30 a bent part 30 b is attached, opposite to the axis 31 opposite to the hook 30 a. A spring 36 is fastened at one end to the bent part 30 b of the pawl 30 and at the other end to a stop 37 which is attached to the other arm of the rocker arm 32. In this way, the pawl 30 is forced to perform a counterclockwise pivoting movement about the axis 31 by the force of the spring 36.

If the parts are as shown in FIG. 1 assume the position shown, d. H. when the solenoid 33 is not energized is, the stop 37 is in contact with a right shoulder 30 c of the pawl 30 - as from »O F i g. 1 visible - held to prevent that the pawl 30 due to the force of the spring 36 moves counterclockwise carried out. The pawl 30 blocks the gripping arm 2 in this position.

»5 An arm 38 is - as in FIG. 5 can be seen - firmly connected at its base to the other end of the shaft lili, to which the arm 7α is also attached. A connecting member 39 is pivotably attached at one end to the front end of the arm 38 and at the other end to an arm 40 a of an angle lever 40. The angle lever 40 itself is pivotably mounted on a shaft 41 which is attached to a side plate, not shown, of the printing press. At the end of a second arm s 40 b of the angle lever 40, a roller 42 is rotatably attached, which by the force of a spring 43 counterclockwise around the axis 41 according to FIG. 1 is pivoted. The angled lever 41} pivoted counterclockwise in this way causes the shaft lti to rotate in the same direction, so that the etching roller 3 is pressed against the plate cylinder 4. The gripping arm 29 attached to the shaft 10 is also moved by the counterclockwise pivoting movement of the angle lever 40 from FIG. 1 rotated. Therefore, the gripping arm 29 exerts with its bent end 29 a pressure against the hook 30 α of the pawl 30, which is kept locked by the stop 37 against pivotal movement counter-clockwise.

After the main switch has been closed and the process step which initiates the application of the etching liquid has been carried out, a start button is pressed. By pressing the start button, a plate feed roller 44 begins to rotate in the direction of the arrow / as shown in FIG. Furthermore, the feed of the top printing plate of a printing plate stack O, which rests on a printing plate table, is fed to a guide plate 46. At the same time, the electromagnetic clutch 21 is brought back into engagement as shown in FIG. 5 and controlled by the timer in the manner described above, so that the etching roller 3 and the transfer roller 2 rotate during the 6s application of the etching liquid,

In a central area, based on the length of the guide plate 46, are transport rollers 47 and 48 attached, which are pressed against each other

Rotated by the bias of the spring 3C) axis 31 until the shoulder 30 c back to the stop 37 abuts.

After the downward movement of the s roller 42, which by the projection 50 ti des Cam 50 is effected, as mentioned above, a complete release of the gripping arm 29 from its engagement with the pawl 30. The shaft 10 is therefore counterclockwise by the V d Fd 43 ie Di bikt

turn. Adjacent to the transport rollers 47 and

48, an operating lever 49 α of a switch 49 is attached.

As soon as the printing plate of the feed roller 44 has been removed from the stack of printing plates the transport rollers 47 and 48 is taken, the actuating lever 49 α is moved by the pressure plate and thus the switch 49 is closed. The desk

49 is in the circuit of the solenoid 33 an- gg g

arranged so that this du.ch the closing of the i ₀ bias of the spring 43 rotated. This causes. Switch 49 is energized. that the arms Ta and 76 a pivoting movement in

The excitation of the solenoid 33 has the effect that the same direction as the counterclockwise armature 33 α perform the connecting arm 34 from the point of view meaningful rotation of the shaft 10, from Fig. 1 to the right. The oscillating lever 32. As a result, the etching roller Ά is released from its engagement in an anti-clockwise direction about 15 with the transfer roller 2 and is pivoted into contact with the axis 31. This counter to the clock with the plate cylinder according to F i g. 4 GebncDit. Movement of the rocker arm carried out in a clockwise direction at this point in time, the front end of the pressure 32 causes the stop 37 to be gripped by its engagement plate in a recess 4 α of the plate with the shoulder 30 r of the pawl 30 according to the 4 attached gripper 4 1> . Since the F i g. 3 is released. The pawl 30 is ao plate cylinder 4 and the etching roller 3 released in the opposite direction, so that they rotate about the axis 31 set direction, they rub with their upper counterclockwise from the force of the surfaces against each other, while the etching liquid can be pivoted on spring 36. The bent over the pressure plate is applied. The end of 29 α the. Gripping arm 29 is, however, fixed in the cam 50 is designed such that, as long as

Engagement with the hook 30 α of the pawl 30 as 15 the \ U roller 3 is still held in contact with the plate cylinder 4 mentioned above. The friction between are held, no other area on the circumference see the bent end 29 α and the hook of the cam 50 except for the mentioned projection 50 0 30 α is selected to be greater than that of the tension that moves the roller 42 upwards. The plate cylinder 4 spring 36 exerted force. The gripper 29 remains and the etching roller 3 is locked for several times by the pawl 3 ©. So that 30 rotations are kept in contact with each other, so that the etching roller 3 is now in contact with the plate cylinder- the etching liquid is carefully applied to the printing plate on the 4, shortly after the printing plate has been attached. During the supply of the etching this can bring what is running in more detail in the following liquid, therefore the etching roller 3 is described several times, the gripping arm 29 must not directly past the recess 4 α. Since the roller 42 is unlocked by 35 by the excitation of the solenoid 33, the projection 50 α of the cam 50 will be every time. The pawl 30 is therefore only moved from upwards when the etching roller 3 runs past the recess 4 α of the plate cylinder 4.

the etching roller 3 itself is also lifted up, so that it can be avoided that etching liquid drips into the recess 4 α in 40

Rotates while the etchant is being applied

the cam completely revolves around its position several times

brought to the au g axis. The roller 42 is correspondingly often upwards

Has projection 50 α ; the projection 50 α of the moves, whereby the gripping arm 2! » to the pawl 30 of the cam 50 moves the roller 42 against the preload _{45 is} pivoted. The lifting mast 33 is raised by the tension of the spring 43 when the front timer is controlled in such a way that the connecting end of the rotary plate is held by the grippers of the plate arm 34 with respect to the rig. I remains drawn to the right after cylinder 4 during the rotation of the cam 50, as the application of the etching direction of the arrow b with the blanket cylinder 5 takes place. The pawl 30 therefore remains gripped. As soon as the roller 42 moves upwards 50 also during this period of time in a position, the angle lever 40 moves in a direction in which it is not effective. The gripping arm 29 therefore ejects the clockwise pivoting movement in the direction about the axis 41 despite its visual pivoting movements. This pivoting movement of the pawl 30 is not locked by this. Angle lever 40 is on the shaft 10 via the As soon as the application of the etching liquid is finished

link 39 and ann 38 transferred. It is 55, the solenoid 33 is switched off, which is why there is a rotary movement of the shaft 10 in which the connection 34 is in accordance with FIG. same direction as the rotary movement of the angular again to the left. The rocker arm 32 moves the lever 40 around the axis 41. The rotation of the shaft therefore causes a swivel movement counter to the clock 10 in the Uhi-pointer sense, "let the gripping arm 29, pointer around the Axis 31 through, so that the one in F i g. 3 assumes the position shown, 60 impact 37 on the shoulder 30 c dcT pawl 30 is pivoted about the shaft 10 in a clockwise direction. Plant comes and moves it. The pawl 3 <This is the bent end 29 α of the gripping is therefore in the from Fig. 1 visible locking arm 29 brought from contact with the hook 30 a of the treatment and released in this position by the pawl 30 connection. Since the rocker arm 37 is held. If now the pawl 30 i | 32 is located counterclockwise around the axis 31 6s of this position, the bent part is swiveled clockwise by the: excitation of the lifting magnet 33 according to 29 a of the gripping arm 29, which has swiveled about the shaft 10 i «i above, when the bycl pawl 30 counterclockwise around the projection 50 α of the cam 50 caused

will. The pawl 30 is g

its engagement with the stop 37 of the rocker arm 32 is released by the excitation of the lifting magnet 33 until the etching roller Ά is brought into contact with the plate cylinder 4

On the axis 5 α of the blanket cylinder 5 is - as from F i g. 1 can be seen - a cam 50 is attached, which has a V 50 on its outer circumference; the projection 50 α des

upward movement of the roller 42 takes place, in contact
brought with the hook Ma of the pawl 30,
as soon as the gripping arm 29 carries out its return movement in a counterclockwise direction. The gripper arm
2 ¹ ) is then in this position by the pawl

30 locked. As soon as the gripping arm 29 is locked by the pawl 30, the etching roller 3 is in held in their upper position. The electromagnetic clutch 21 is also activated at this time separated.

For this purpose 2 sheets of drawings

Claims (1)

Claim: Control device of an automatic etching work of a bundling machine with a Raselemente.aufweisendenArret ^ rvornchtung.we- before, π locked state, an etching roller holds in the lifted state from the plate cylinder and, after loosening, releases the roller to rest on the P attenzy indder, whereby locking and switching levers, springs and a cam rotating with the plate cylinder for controlled movement and lifting of the Etching roller are present, characterized in that a rocking lever (32) provided with a stop (37) and a gripping arm (29) which is connected to the etching roller (3) and movable by the cam (50) rest on the stop (37) Locking pawl (30) are provided that a spring (36) is attached between the stop (37) and the locking pawl (30), and that a rocker arm (32) controlled by a switch (49) is used to release the gripping arm (29) ) moving, removing the stop (37) from the pawl (30) and tensioning the spring (36), H _utaag " _e , (33, a" _g e ", d" =, is, This object is thus achieved according to the invention in the case of the control device of the type mentioned at the beginning oeiüsl that a geiusi provided with a stop, <™ . _{u the Ätewa} , _{M ver} . Schw.ngn.-You unn ^ movable gripper arm s bun ^ nf rch O ^ ^. ^ ^^ \ _dd ^ _{between the} attack and the a spring is attached and that for Sperkheine ^ d ^ a j ^ ^ ^^ approved ucs vj. moving to controlled, the ^^^ ™ sch ag of de. Spring ^ uie