DE1436623A1 - Device for perforating a layer in a stencil - Google Patents

Description

AP / BWK

Zeuthen & Aagaard A / S, Glostrup, Denmark.

Device for perforating a layer in a stencil. "

The invention relates to a device for perforating a layer in a stencil and with a rotatably arranged Drum, on whose curved surface a template and a template are held next to each other in the longitudinal direction of the drum an optical system with a light source and a photosensitive element for scanning the template during the rotation of the drum, an amplifier for the signals generated by scanning, and a perforating device, e.g. a perforating electrode which, under the influence of the amplified signals, coincides a layer in the stencil perforated when the original is scanned, e.g. by electrical discharges.

Such a device is used to produce a template from a template, for example a pamphlet, a picture, a drawing or other , in which a layer is perforated in accordance with the template . Such a stencil

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can be used on a duplicator, offset press, or other similar duplicating machine to produce any number of copies of an original. The device can also be used to make single copies. The perforation of a layer in a stencil can also be carried out thermally or mechanically, for example, or by a chemical process

Known devices of the above type, e.g. devices for perforating electrical stencils for use in conjunction with duplicators, can be constructed in such a way that the drum on which the template or stencil is held

fixed
is arranged in the machine / and can only be moved around its longitudinal axis. To scan the original and perforate the stencil accordingly, the optical system that performs the scanning and the perforating electrode that generates the perforation of the stencil must be rotated of the drum can be moved in the direction of the axis of the drum _. z _e as a threaded spindle, presented, demonstrating the these parts parallel to the drum axis. Due to the rotation of the drum and the simultaneous axial movement of the optical system and the Perforierelektrode, the document is scanned by a helical line and the stencil is perforated accordingly. The speed at which the optical system and the perforating electrodes are presented in the axial direction can be adjusted * «in, to

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that the slope for the helical scanning can be varied. A slow demonstration speed of the optical Systems gives a long scan time, but at the same time ensures a better reproduction of details.

In the above-mentioned devices, the optical system contains a light source, a lens system and a light-sensitive one Element. From this light-sensitive element, e.g. a photocell, a photomultiplier tube or a Can be photoresistor, signals are taken that correspond to the instantaneous light value in the helical path that is scanned on the original. The signals from the photosensitive element become one in the device built-in amplifier, which, controlled by these signals, supplies supply voltage for the perforating electrode, so that the stencil is perforated in accordance with the scanning of the original.

The construction of the known devices discussed above, in which the optical system and the perforating electrode are shown in Axis direction of the drum are moved, requires that the connecting lines between the amplifier and the optical System or the perforating electrode must be quite long. These lines must also be flexible and so arranged be that they move back and forth along the control members of the optical system and the perforating electrode cannot be damaged. It is also necessary that in particular the signal lines from the light-sensitive Element of the optical system to the amplifier are shielded, otherwise interference in the relatively weak signals

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from this photosensitive element. Because these shielded cables from this photosensitive Element to the amplifier, as mentioned above, necessarily have a considerable length, and there shielded cables inevitably have a certain capacity per unit length, the total capacity of these lines is often of of such a size that unwanted changes to the Amplifier-transmitted signals and thus a limitation of the speed with which an original can be scanned, may occur.

by

The perforation of the stencil, e.g. / electrical Discharges generated by means of the perforating electrode result in certain waste products in the form of, among other things, carbonized particles from the template, and these waste products must not be allowed to enter any part of the device. Devices of the mentioned Art are therefore usually equipped with a suction device that removes these waste products. As the perforating electrode in the known devices is shifted in the axial direction of the drum, it is necessary that the suction inlet ^ Direction, e.g. by means of a flexible hose or the like., Is moved together with the perforating electrode. This can cause considerable constructive difficulties. A fixed suction device that covers the entire length in moving the perforating electrode will require a very large suction capacity.

The invention aims at an improved construction by a fundamentally changed construction of the known devices to obtain, the greater working speed and remedy of the above-mentioned deficiencies.

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The device according to the invention is characterized by a drum demonstration device set up in such a way that the drum is displaced in its axial direction during its rotation, the optical system and the perforating element arranged in a fixed position relative to the geometric axis of the drum and preferably with the amplifier are assembled.

With such a design of the device, the difficulties with. the line routing from the amplifier to the optical system or perforating element, because it is possible to arrange these parts directly on the amplifier or assembled with it, so that the associated lines can be so short that the difficulties mentioned with regard to capacitive influence are avoided are, the same time as the risk of damage is eliminated these lines. in addition, allowing a simplified mechanical design, and the suction of AbfällproduKte..trj.rd generated in the stencil during perforation of the layer simplified since the Absaugeinrich- _(tung fixed and can be designed with a limited suction capacity.

An embodiment of the device according to the invention is characterized in that the drum is a stationary one Shaft is rotatably arranged and along its outer circumference has a gear member that during his axial displacement remains in constant engagement with a drive member. This is an expedient drive of the Drum reached. The drum can be driven in various ways and does not need a fixed one

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mechanical connection between the gear unit and the To be present, e.g. the drive can be done electromagnetically, but one in a constructive way With regard to a particularly simple design of the device according to the invention is characterized in that the gear member is a is the rubber lining arranged at the end of the drum, with an elongated roller lying parallel to the drum axis is engaged.

A special embodiment of the device according to the invention is characterized in that the stationary drum shaft is stored in the device so that it can be easily removed. This facilitates maintenance of the device and increases its utilization of the device, since two or more drum systems can be used for each device, so that more, ϊ one. Drum system in the device works, another drum system can be prepared, i.e. with a drum system to be scanned Template and a stencil to be perforated is provided.

Another embodiment of the device according to the invention is characterized in that the drum on the fixed shaft over rolling elements on three or more in the drum, mainly in their. Run longitudinally ^ the intermediate shafts are mounted, which are mounted with play in organs ah the ends of the drum that these organs in their Planes for inclination of the intermediate shafts with respect to the fixed shaft at a certain angle to each other can be rotated, and that for generating axial movement of the drum means for influencing one of the intermediate shafts present in the radial direction of the drum to cancel the game

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are. Overall, this training becomes a two-way course constructive generation of the axial movement of the drum achieved. It is also an appropriate storage of the drum secured, as this is mounted for rotation around the fixed shaft on the rolling elements of the intermediate shafts. Through this, it is that the end bottoms are designed such that they can be angularly rotated relative to one another

possible to cause an axial movement of the drum, since the Intermediate shafts with such a displacement of the end floors to each other in an inclined position compared to the stationary Shaft, and also the rolling elements lying on the intermediate shafts are fixed in relation to the stationary one The shaft will be tilted, and the drum will, as a result, have the desired helical movement around the execute fixed shaft. The coupling and decoupling options available in this training have, among other things, the The advantage is that when the drum is in the rest position, it is possible to close the drum with little force in its axial direction move.

According to a further embodiment of the inventive The device consists of the means for influencing an intermediate shaft in a centrifugal device. This will the axial movement of the drum is automatically switched on when the drum reaches the desired rotational speed after starting has reached. It is also expedient according to the invention that the centrifugal device has a At least in the switching direction flexible connection acts on an organ that has an intermediate shaft in the radial direction

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affected by the drum. This embodiment is particularly advantageous in the case in which the device is to work with different rotational speeds of the drum is set up. Due to the yielding connection between the centrifugal device and the influencing organ is subjected to such a strong load on the rolling elements at high rotational speeds prevents them from being damaged.

A particular embodiment of the device according to the invention is characterized in that each of the end bottoms of the Drum is provided with a circular opening into which the ends of the intermediate shafts running inside the drum are performed that these intermediate shafts have rolling elements that rest against the stationary shaft, and hubs that the openings of the end bottoms, and which intermediate shafts with play in special, in planes mainly parallel with end plates lying on the end bottoms are supported, which can be angularly rotated in these planes in relation to one another, that one of the intermediate shafts is mounted in the end plates in an opening elongated in the radial direction, and that this shaft is influenced by a centrifugal device in the radial direction of the drum. This creates a In particular, in terms of production, advantageous training is achieved, since by using special end plates and end bottoms of the drum firmly connected to the drum shell, greater manufacturing accuracy can be achieved.

In an advantageous embodiment of the invention the rolling elements can be roller bearings, e.g. ball bearings.

In a further embodiment of the device according to the invention, the special end plates are located outside the

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End bottoms of the drum, and each is held in place by means of a spring which affects the end plates in such a way that a protruding part thereof rests against a cam disk, the cam disk lying at one end is fixed, while the other is in communication with an adjusting member. This makes a useful one Adjustment option for turning the end plates against each other for continuous adjustment of the pitch of the helical one Movement of the drum along the fixed shaft is achieved.

Another embodiment according to the invention is characterized in that the centrifugal device lies inside the drum and has a swivel block on a rotatably mounted swivel arm that this swivel arm rests against one end of a lever under the action of a spring, the other end against the hub under the influence of the block the intermediate shaft, which is mounted in an elongated opening in the end plates. The arrangement of the Centrifugal device in the interior of the drum is useful because it does not take up any space that is used for other purposes is needed, and the specified connection between the centrifugal device and the parts that make up the intermediate shaft influence, ensures that the exerted force does not exceed the permissible at high rotational speed.

In another embodiment of the device according to the invention, the centrifugal device has a further one Swivel block on a swivel arm, which is mounted diametrically opposite the first swivel arm, and which swivel arm is connected via a connecting link to the first swivel arm that the two swivel blocks during their

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Swiveling are mainly diametrically opposite. This achieves a balancing of the drum system and at the same time changes in the action of the gravitational field on the centrifugal device while the drum is rotating are avoided. ■.

An invention associated with the discussed invention relates to a perforating electrode system for use in a device of the specified type for perforating electrical stencils. According to the invention, this perforating electrode system is characterized in that the perforating electrode is stationary. In contrast to known devices in which the Perforierelektrodensystem along the drum is moved, and in which the replacement of Perforierelektrode will be applied only after the Perforierelektrcd ^e has been brought one System to its original position, it is possible in accordance with the invention given training that Perforierelektrode to be replaced regardless of the mutual position of the perforating electrode and drum. The design according to the invention also has the effect that the aforementioned suction device can be stationary. -.-.-.

A special embodiment of the invention Perforating electrode system is characterized in that the supply circuit of the perforating electrode is in the rest position the drum is switched off. This protects against electric shock during replacement. Furthermore, an inventive Embodiment characterized in that the perforating electrode has an insulating handle. this gives further contact security. The said handle is

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According to the invention, it is expediently designed as a plate with a T-shape.

A special embodiment of the perforating electrode system according to the invention with a perforating electrode holder and a perforating electrode arranged therein is characterized in that the perforating electrode holder consists of electrically insulating material consists of a guide for receiving and holding the perforating electrode. This contributes to this to facilitate the replacement of the perforating electrode and to increase the contact security.

The system according to the invention can also be designed in such a way that the perforation electrode holder is guided has such a shape that the underside of the cross bar of the T-shaped perforating electrode handle the Penetration depth into the perforating electrode holder is limited. This is advantageous because it makes time-consuming adjustment of the

Penetration depth can be avoided.

In addition, the system according to the invention can be designed in such a way that the handle of the perforating electrode and the guidance of the holder around their longitudinal axes are asymmetrical, which prevents the perforating electrode from being inserted incorrectly will.

The system according to the invention can also be designed in this way be sure that there is a power supply pin in or on the holder which is influenced by the starting of the drum of the device and is designed to come into contact with the conductive Share the perforating electrode and press this electrode against the stencil attached to the drum. This has the effect that the perforating electrode is always de-energized

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is when the drum is stopped and removed if necessary and also that the perforating electrode can easily assume its correct position in relation to the template can.

Finally, there is an embodiment of the invention Device characterized by means for locking the starting device of the device when removing the / frommel. This ensures that when the drum is removed as a result of the locking of the starting device, it is not accidentally Voltage can be applied to the perforating electrode, which is exposed in this case.

The _r invention will be explained in more detail below with reference to the purely schematisehe drawing, on which a concrete exemplary embodiment of a device is shown for perforating electric stencil, without that the invention is limited to the so described.

Fig. 1 shows an embodiment of an inventive apparatus for perforating stencil electric seen from above, which apparatus comprises means disposed on a fixed shaft drum carrying an original and a stencil in the form of an electric template;

Fig. 2 shows an image of the drum from the outside and seen from its end and shows a possible design the bearing of the drum on the drum shaft and the drum drive system;

Fig. 3 shows a corresponding figure, the one Section through the drum perpendicular to its axial direction zexgt, and at the same time here is the position of a perforating electrode shown in relation to the drum;

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Pig. 4 shows a section along the line IV-IV in FIG

Fig. 3;

Figures 5 and 6 show, partly in section, an illustration of the locking device in connection with the mounting of the fixed shaft of the drum, with and without the shaft in place ;

Fig. 7 shows a perforating electrode holder in plan view and in natural size, and

FIG. B shows a perforating electrode belonging to this, seen from the front.

In Fig. 1, an illustration of a device for perforating electrical stencils is shown in plan view. This The device has a box with a cover plate 1 and two end plates 2 and 3. The front part of the device has a trough-shaped recess 20, see Fig. 5, in which a rotatable drum 5 is mounted on a shaft 4. On the curved surface the drum 5 can have a template 6 and an electro-stencil 7 can be clamped. The template 6 is held on the left part of the drum 5 with a holding rail Ö while the template 7 is held in place with a corresponding holding rail 9. These support rails Ö and 9 can. Von any be suitable training, which will not be described here, and are with a handle 10 and 11 for Clamping or releasing the template and the template operated. To the template to be copied, a drawing, a To protect typewritten documents, a photograph or the like, and to hold on to a difference in size To facilitate between template and drum, an adapted Sheets made of transparent material can be used

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placed over the template and fixed with the retaining rail 8. »The template is used in a format * that fits exactly around the drum and is held in place with the holding rail 9. . .

The principle on which the device is based is briefly explained below. The drum 5 of the device is intended to rotate around the fixed shaft 4 and, as will be described in detail below, is also intended to move axially to the shaft 4 with a slight incline. A point on the surface of the drum will hereby be made to describe a helical path. An optical system 12 directs a fine beam of light against the drum and the original attached to it. Part of the light hitting the original will be reflected onto a light-sensitive element that is in..that .; optical system is built in. The part of the incident light that is reflected from the original onto the light-sensitive element expresses the light value at the relevant point on the original. If the individual points on the surface of the drum 5 have a helical path with a low pitch _; describe along the drum shaft 4, an electrical signal can be derived from the light-sensitive element in the optical system 12 which corresponds to the instantaneous light value in the helical path which is scanned on the original. The signals from the light-sensitive element, which can be, for example, a photocell, a photomultiplier tube or a photoresistor, are fed to an amplifier unit built into the device and located under the cover plate 1, which is controlled by the signals supplied

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appropriate voltage too. a perforating electrode 13 supplies. This perforating electrode 13, which is in a perforating electrode holder 14 is arranged and has an insulating handle 15 is shown in detail in Fig. Ö of the drawing. The perforating electrode 13 is arranged so that it contacts the stencil 7 and over it during the rotation of the drum the surface of the stencil slides. When by rotation of the drum and controlled by the electrical signals coming from the Optical system 12 are derived, a suitably high voltage is fed to the perfection electrode 13, breakdown occurs done through the electrical template 7. So it will a perforation of the electrical stencil, controlled by the template, is generated. When the stencil is completely perforated, i. E. When the entire template has been scanned, the template can be removed and used to produce a desired number of copies in a duplicator.

The amplifier built into the device can, for example, transmit the signals transmitted by the from by means of the light-sensitive element the light reflected from the template are derived, so implement, that dark areas on the template are converted to voltage on the perforating electrode, while light areas on block the voltage on the perforating electrode. However, the implementation can also be carried out in the opposite direction so that light areas on the template cause voltage on the perforating electrode, while dark areas cause it Block tension. The amplifier, by the way, is not closer is to be described is provided with two adjustment knobs 32 and 33, one of which is used to set the on the * Perforating electrode desired voltage and the other to

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Setting a level value that is used for the point on a gray tone scale from which the stencil is to be perforated is decisive. An indicator 16 is used to indicate whether perforation of the stencil is taking place at any given moment during the rotation of the drum or not. This indicator can therefore be used to determine whether the at a given point in time before the The area of the original located in the optical system of the device has a light value that is above or below that set in the device Level value lies.

At the left and right ends of the drum 5 there is a lining 17 or IS, ZcB. in the form of an annular Organ made of rubber, plastic or the like. The covering IS engages in a lying in the trough-shaped part 20 of the device Drive roller 19 a. The drive roller 19 is of a length which corresponds to approximately half the length of the drum, so that this The driving roller always engages in the lining 1 $ during the helical movement of the drum around the stationary shaft 4.

In the previously used devices of the type discussed, the template and template-carrying drum ^ is displaceable arranged in the axial direction and only intended for rotation ο To scan over the original and in To achieve appropriate perforation of the stencil, the optical system and the perforating electrode must be used in these hitherto used devices can be arranged movably, e.g.

by arrangement on a threaded spindle, which is an axial Caused movement of these parts relative to the drum, whereby the desired helical scanning is achieved. In

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the device described here are the optical system 12 and the perforating electrode holder 14 with the perforating electrode 13 arranged therein is firmly installed in the device, so that long, moving lines leading to these parts are avoided. These parts, on the other hand, can be linked directly to the associated mentioned amplifier are assembled, which is both mechanically and electrically of great advantage.

The drum 5 is started by a starting handle 21. The drum 5 can be started with suitable means, which will be described later is supported so that it can rotate on the shaft 4, and this bearing is designed so that the drum is simultaneously rotating in the axial direction along the shaft 4 with a slight pitch emotional. This pitch of the helical movement along the shaft 4 is regulated with a control handle 22.

Under a control panel 23, which the adjustment knobs 32 and 33 as well as the indicator 16 and the starting handle 21 are two removable covers 24 and 25 each on one Side of the perforating electrode holder 14 arranged. These lids 24 and 25 cover filters that are turned into air ducts through which the particles and types of gas that arise when the stencil is perforated are sucked out will. This ventilation around the perforating electrode can in the present device in contrast to the previously used Constructions are made through fixed ventilation ducts. A connected to the drive motor, not The fan shown ensures suitable suction into the named channels *

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A parking device 26 is adjustable in a gap 2? arranged and provided with a storage arm 28 which röicht into the trough-shaped part 20 of the device and lies in the path of the drum 5. When the drum 5 hits the arm 20, the starting handle 21 is reset mechanically or electromechanically, whereby the drum is brought to a standstill. The parking device 2 $ can be adjusted in gap 27 according to the width of the original to be scanned,

The shaft 4 on which the drum rotates is in a bearing 31 in the right-hand end of the trough-shaped part 20 stored and stored in the left end in an approximately corresponding bearing which is covered with a cover 30. Under the Lid 30 is a locking device that is under a locking arm 29, see FIGS. 5 and 6, which is connected to the starting handle 21. Training the aforementioned locking device is described in more detail in connection with FIGS. 5 and 6 of the drawing. The locking device is set up so that when the drum is in the rest position, the shaft 4 is shifted to the right after a quarter turn can be so that the left end of the shaft 4 protrudes from the cover 30, after which the shaft 4 and that on it arranged drum can be removed from the device. The locking device under the cover 30 ensures in .-, ... Connection to the locking arm 29 ensures that the starter handle 21 cannot be activated when the drum is out of the device removed, which ensures that the perforating electrode 13, which can be accessed by removing the drum!

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in case of tension. This easy take out of the drum from the device means that, for example, two or more drums can advantageously be used for the same device, whereby one, while the device is working with one of the drums, prepare another drum, namely provide it with a template and template can.

The device shown in Fig. 1 can optionally be provided with a cover-like part, not shown, which covers the entire front part of the device lying in front of the control panel 23. This will make the device parts Protected against dust and damage.

In Fig. 2, 3 and 4 a possible embodiment for the device is shown, whereby the drum 5 on the stationary Shaft 4 is mounted. Figure 2 is an illustration of one end of the drum seen from the outside, e.g. Drum 5, which is shown in Fig. 1 on the far left.

In the case shown, the end base of the drum consists of a circular end plate 35, on the outer periphery of which the covering 17, for example as a rubber ring, is arranged. In Fig. 2, the position of the elongated drive roller is also shown, which engages in the lining 10 at the opposite end of the drum. In addition, the operating handle 10 for the holding rail Ö is shown. The end plate 35 has a circular recess in the form of an opening 36, and three intermediate shafts 37, 30 and 39 protrude from this opening and extend through the entire length of the drum. An annular spring 40, see FIG. 3, is guided through bore holes in the three intermediate ^{shafts 37, 30 and 39 and is used to control these intermediate shafts against each other during the:} Xnbringetis "of the shafts in the

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Drum. A roller bearing, for example a ball bearing or the like, 41, 42 or 43 and a hub 44, 45 or 46 are arranged on each of the intermediate shafts 37, 3 and 39. The intermediate shafts 37, 3S and 39 are guided through openings in a special end plate 47 which lies outside the end plate 35 of the drum. This particular end plate 47 is used to hold the three intermediate shafts 37,3 # and 39 in fixed positions with respect to one another, but the opening 4 # through which the intermediate shaft 39 is guided through the end plate 47 is designed as an elongated opening which allows movement of the intermediate shaft 39 allows in the radial direction. A locking ring 49 for holding the particular end plate 47 in place is arranged on each of the intermediate shafts. Each of the hubs 44,45 and 1 + 6, which are circular, has a circular shoulder 50 which rests against the inner surface of the end plate 35 of the drum, while the hubs 44- ^ ° themselves against the edge of the opening 36 issue. The bearing device is also dimensioned in such a way that the roller bearings 41-43 with their outer races rest lightly against the stationary shaft 4 at the same time that each of the three hubs 44-46 rest with a point on the edge of the opening 36. Since the intermediate shaft 39 is mounted in an elongated opening 4 # in the special end plate 47, influencing this intermediate shaft 39 or the hub 46 arranged on it in the direction against the shaft 4 will press the roller bearings with a certain pressure against the stationary shaft 4. A switch-on device for imparting such a force to the hub 46 will be described later in connection with FIG. This switch-on device consists of a centrifugal device that switches on the axial movement of the drum 5 when a

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corresponding rotation speed is reached.

The following is to be explained how the drum 5 during its rotation axial movement along the stationary Wave 4 can be taught. The particular end plate 47 is provided with an opening 55, whereby a coil spring 53, the other end of which is attached to a pin 54 on the end plate 35 of the drum. The spring 53 presses a protruding part 51 of the special end plate 47 against a cam disk 52 «This cam disk, which is rotatable is denoted by 22 in FIG. 1 with a not shown in FIG. Control handle provided. The drum bearing that is now described for one end of the drum 5 is constructed accordingly at the other end of the drum, except that the protruding part corresponding to the protruding part 51 in Fig. 2 at the opposite end of the drum, rests against a fixed cam disc which is used for adjustment Adjustment of the device is determined by the factory. So this will mean that the entire storage facility will be on opposite end of the drum 5 opposite that shown in Fig. 2 in Fester.Ststellung. When turning the cam disc 52 in Fig. 2, for example in the direction of the arrow, the particular end plate 47 becomes due to the protruding part 51 and against the action of the spring 53 cause the intermediate shafts 37-39 to move in the direction indicated by arrows. There the opposite ends of these intermediate shafts are fixed as mentioned, this rotation of the cam disk 52 becomes with it lead that the three intermediate shafts 37-39 are no longer parallel to the fixed shaft 4, but in an inclined position advised to this. The inclination of the intermediate shafts

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37-39 is made possible by the fact that, as mentioned, they are connected to a bearing some play in the particular end plate 47 and the corresponding end plate at the opposite end of the drum are ο

As a result of the fact that the intermediate shafts 37-39 and thus also the shafts of the roller bearings 41-43 with the stationary Shaft 4 are no longer parallel, the running surfaces of the roller bearings will move during the rotation of the drum do not move in a circular path but in a helical path over the fixed shaft 4. this causes the drum 5 when it is made to rotate by means of the drive rollers 19, and when the switch-on device influences the intermediate shaft 39 radially inward, a helical movement along the fixed shaft 4 and the pitch for this helical movement can be varied by rotating the cam 52. It should be mentioned that the pitch of the helical movement is very small, so that which is made during the movement Scanning can result in a detailed rendition of the original on the stencil. Regarding Fig. 1 will indicate that the optical system 12 has a helical path with a slight pitch on the original

6 scans while the perforating electrode 13 is in a corresponding helical path perforating on the stencil

7 caused, and by turning the control handle 22, the Inclination of the roller bearings can be changed within wide limits, so that the slope of the movement of the drum 5 along the shaft 4 and thus the fineness of the scanning carried out can be adjusted as desired.

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Hereinafter, in connection with FIGS. 3 and 4 of the drawing, the device will be explained in more detail, which in the case of centdfugal influence the axial movement of the drum 5 turns on. In Fig. 3 a section through the drum 5 is vertical shown on the drum axis. This creates an image of the storage device at one end of the drum from the inside got seen. Fig. 4 shows a section along the line IV-IV in Fig. 3, and serves to clarify the details in this figure.

The reference number 60 indicates the drum shell, and an opening 61 in this shell is for receiving one of the Holding rails determined, which is omitted in the present figure for the sake of clarity. At one shaft end 62 is an angle arm 63 stored, one end 64 with a curved surface against the shoulder 50 of the hub 46 rests. The opposite end 65 of the angle arm 63 is bent over and lies against one Swivel arm 66, which carries a swivel block 67. The pivot arm 66 is also mounted on the shaft end 62, and that opposite the pivot block 67 opposite end of the pivot arm 66 is denoted by 6Ö and is intended to rest against to get a stop pin 69. A spring 70 presses the angle arm 63 and the pivot arm 66 with a certain pressure against each other, this spring being guided through openings in the end 65 of the angle arm or in the pivot arm 66. If the Drum 5 is made to rotate by means of the drive rollers 19, the pivot block 67 is outwardly in the direction against the Drum shell 60 are pressed. As a result, the angle arm 63 will also be rotated around the shaft end 62, and the end

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64 of the angle arm 63 is against the shoulder 50 of the hub 46 press. As a result, the roller bearings 41-43 are pressed against the fixed shaft 4, and the drum 5 is disengaged their rotation, the aforementioned axial movement along the shaft 4 as a function of the generated by means of the cam disk 52 Make the roller bearings 41-43 inclined. It should be mentioned that the end 64 of the Winkelarms'63, which against the shoulder 50 of the Hub 46 abuts, is designed with such a curvature that the hub 46 gradually longer with the rotation of the angle arm 63 and is pressed radially inwards for longer. In this connection, it should be mentioned that the hub 46 in a simple manner the to enable mentioned radial movement, with a slightly smaller diameter than the two hubs 44 and 45 is formed ^ The centrifugal device contains a further swivel arm 71 which is mounted on a shaft end 72 and a Pivot block 73 carries. The pivot arm 71 is connected to the pivot arm 66 by means of a connecting link 74. That Link 74 is rotatably connected to said pivot arms by means of connecting bearings 75 and 76, respectively. The two Swivel arms are connected to one another in such a way that their effects support one another and by using two opposing pivot blocks is on the one hand a Balancing of the drum system and on the other hand a compensation of the gravitational field.

The spring 70, which presses the bent end 65 of the angle arm 63 against the pivot arm 66, is also used for Protection against excessive force influence on the roller bearings of the storage system at high rotational speed. If the device is used, for example, to work with two or more rotational speeds

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speeds of the drum is determined, the centrifugal device is such that a suitable system pressure for the roller bearings 41-43 to the fixed shaft at the lowest rotational speed of the drum 5 is achieved _t and the spring 70 ensures that the roller bearings are exposed to larger size strain when the rotation speed is increased.

After this description of an embodiment of a storage device for the drum 5, it should be mentioned that it would also be possible to mount the intermediate shafts 37-39 directly in the end plate 35, which in this case can be rotated opposite the corresponding end plate at the opposite end of the drum would have to be formed in order to be able to tilt the To enable intermediate shafts with respect to the fixed shaft 4. In most cases, however, the training described above with special end plates 47 from manufacturing and should be preferred for regulatory reasons.

In Fig. 3 is also a perforating electrode holder in section 14 is shown with a perforating electrode 13 arranged therein, and the perforating electrode holder 14 has a displaceable part SO which, by means of a spring, presses oil against the insulating handle 15 on the perforating electrode will. By withdrawing the displaceable part 00 against the pressure from the spring S1, the handle 15 is released in such a way that that the perforating electrode can be pulled out of the holder 14. The perforating electrode holder 14 and the perforating electrode 13 with the associated handle 15 are more detailed in connection with FIGS. 7 and 5 of the drawing shown. The perforating electrode 13 consists of a conductive one

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Material, and is attached to the insulating handle 15. The lower part of the perforation electrode 13 ends in a thin wire # 2, for example made of tungsten or other heat-resistant, conductive material. The wire $ 2 slides over the template 7 attached to the drum 5 and, when voltage is supplied to the perforating electrode 13, causes a breakdown through the template 7. A power supply pin # 3 protrudes over a rotating arm # £, which is used to prevent the voltage from being short-circuited to the power supply pin Ö3 insulating material, and a shaft 109 in mechanical connection with the starting handle 21 of the device and remains, when this starting handle is activated, pressed against the perforating electrode 13 so that the wire Ö2 is guided against the template on the surface of the drum 5. The pin # 3 serves at the same time as a current lead to the perforating electrode 13. The perforating electrode 13 can be made of resilient sheet metal and provided with suitable bends to achieve a correct position in relation to the template. On the lower part of the electrode 13 there is a loosely fitting rivet # 4, which is used to prevent the vibrations of the electrode 13 as a result of the movement of the wire. Steam # 2 over the stencil on drum 5.

FIG. 5 shows the left end plate 2 of the device shown in FIG. 1, viewed from the inside. A lid 30 covers one Locking device for the shaft 4 of the drum. The cover 30 has a recess 90 for the shaft 4 and for one on this Shaft arranged control pin 91, see Fig. 6. The shaft 4 rests in a bearing bushing 92 in the end plate 2, and under the Lid 30 is also a pawl 93, which means

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a spring 94 is gesparint so that a stop pin 95 in abutment against the bushing 92 comes when the shaft is removed. 4 A shoulder Ö9 on the bearing bush 92 ensures that the shaft 4 can only be rotated clockwise when it is inserted, viewed from the illustration in FIG. 5. From the locking device under the cover 30, a locking arm 29 is in connection with the starting handle 21 of the device. The locking arm 29 is mounted displaceably on the control pins 96 and 97 on the end plate 2 by means of elongated openings 90 and 99. The starting handle 21 is connected to a pivot arm 100, the pivot point of which is shown at 101. By means of a control pin 102 on the locking arm 29, a rotatable connection between the locking arm 29 and the rotary arm 100 is produced, since the control pin 102 is movable in an elongated opening 103 in the rotary arm 100. A spring 104 is connected to the rotating arm 100 and holds the starting handle 21 in the position shown in FIG. 5. A pawl 105, which rotates about a point 107 and has a recess 106, rests on a locking pin 108 at turning 100. The device is started by moving the starting handle 21 outwards against the action of the spring 104 until the locking pin 10 $ comes into engagement with the recess 106 on the pawl 105. However, this starting cannot be carried out under conditions as shown in FIG. 5 , since the pawl 93 of the locking device prevents the locking arm 29 from being moved to the left.

Only when the shaft 4 is arranged on it Control pin 91 guided through the recess 90 in the cover 30 into the bearing bush 92 and a quarter turn in the

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U36623

- 2Ö -

Is turned clockwise, the pawl 93 of the control pin 91 will be pressed down against the action of the spring 94, 'and it is then possible to start the device by means of the starting handle 21, since the locking arm 29 is now closed the position shown in Fig. 6, where it rests against the control pin 91, after which the pawl 105 in Engages with the locking pin 10Ö and holds the starter handle 21 in the switched-on position. The latch 105 that the starting handle 21 locks, can in a manner not shown with the adjustable parking device 26 in connection are, which is described in connection with Fig. 1, and when the drum runs onto the arm 28 of this device Such turning of the pawl 105 causes the locking pin 10Ö to disengage from the recess IO6, whereby the starting handle 21 is released and, under the influence of the spring 104, returns to the position shown in FIG.

A shaft 109 can be attached to the pivot arm 100 at the pivot point 101, said shaft extending parallel to the drum shaft 4 inside the device. This shaft 109 is in mechanical connection via the arm BB with the power supply pin # 3 for the perforating electrode 13, see FIG. 3, and can also cause the drive rollers 19 of the drum to be engaged, see FIGS. 1 and 2.

The locking device described above in connection with the starting device of the device ensures that the starting handle 21 can only be moved into an activated position can when the shaft is inserted into the bearing sleeve 92, and the shaft 4 can not be removed from the device before the Starting handle 21 is in the off position. As a result

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locking the starting handle 21 with the drum removed increases the risk of voltage on the perforating electrode 13 which, when the drum 5 is removed, is exposed in the trough-shaped part 20.

In Fig. 7 the perforating electrode holder 14 is shown on a natural scale seen from above. The sliding one Part ÖO on the electrode holder is shown here in a position that corresponds to the perforating electrode used, see above that a narrow gap 109 arises between the part 14 and the part 00. Half-round recesses 110 and 111 in the holder or movable part so secure that the perforating electrode can be inserted and removed without the wire O2 arranged on its tip, see FIG. 3, being bent over or is damaged. As mentioned in connection with Fig. 3, the displaceable part So is by means of a spring oil against the Part 14 is pressed and holds the handle 15 of the perforating electrode in the gap 109.

In Fig. 5, a perforating electrode is seen from the front shown. The wire 82 that slides over the electro-stencil during rotation of the drum on the perforating electrode is determined by, is connected to the perforating electrode 13 at 112, e.g. by soldering or welding. One As already mentioned, loose rivet S4 serves to dampen the Vibrations of the perforating electrode. An elongated opening 113 in the perforating electrode provides suitable spring properties. The perforating electrode 13 can be attached to the insulating handle 15 in any suitable manner, e.g. by means of bent legs, which are inserted through openings in the Handle 15 are guided, as indicated at 115. Of the

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insulating handle 15 can be formed from suitable insulating material, for example it can be made from suitable heavy plastic material to be punched out. A widened part 116 of the insulating handle 15 is used to define the Penetration depth of the perforating electrode into the perforating electrode holder 14. It can be useful to use the insulating handle 15 asymmetrically around the longitudinal axis of the perforating electrode, e.g. "with a shape like a dashed line 117 indicated. The perforating electrode holder must then of course be designed accordingly, and in this way it can be ensured that the perforating elec- ■ Trode can only be inserted into the holder 14 if it is correctly turned.

The invention is not limited to the embodiments described here and shown in the drawing, in which numerous changes can be made> without deviating from the scope of the claims attached. It will -. ..-: It is therefore evident that the present invention, among others, *; - iir Connection with offset, single copy, etc. and everywhere there - ■ can be used where it is a question of perforating a layer in a stencil.

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Claims (22)

Claims. lJ device for perforating a layer in a stencil and with a rotatably arranged drum, on the curved surface of which an original and a stencil can be held next to one another in the longitudinal direction of the drum, an optical system with a light source and a photosensitive element for scanning the original during the Rotation of the drum, an amplifier for the signals generated by scanning, and a perforating element, e.g. a perforating electrode, which, under the influence of the amplified signals, perforates a layer in the stencil in accordance with the scanning of the original, e.g. by means of electrical discharges, characterized by one set up in this way Drum demonstration device that the drum is displaced in its axial direction during its rotation, the optical system and the perforating electrode being arranged in a fixed position relative to the geometric axis of the drum and preferably being assembled with the amplifier. 2. Apparatus according to claim 1, characterized in that the drum is rotatably arranged about a fixed shaft is and along its outer circumference has a gear member that is in constant motion during its axial displacement Engagement with a drive member remains. 809811/028 5 3. Apparatus according to claim 2, characterized in that the gear member is arranged at the end of the drum Is rubber lining which is in engagement with an elongated roller lying parallel to the drum axis. 4. Device according to claim 2 or 3, characterized in that the stationary drum shaft can be easily removed in the device is stored. 5. Apparatus according to claim 2, 3 or 4, characterized in that the drum is on the fixed shaft via rolling elements mounted on three or more intermediate shafts in the drum, mainly in the longitudinal direction thereof is, which are stored with play in organs at the ends of the drum, that these organs in their planes to inclination the intermediate shafts are rotated relative to the fixed shaft at a certain angle to each other can, and that for generating axial movement of the drum means for influencing one of the intermediate shafts in the radial direction the drum to cancel the game. 6. Apparatus according to claim 5, characterized in that the means for influencing an intermediate shaft consist in a centrifugal device. 7- device according to claim 6, characterized in that the centrifugal device acts on an organ via a connection that is flexible at least in the switch-on direction, which influences an intermediate shaft in the radial direction of the drum. 3. Device according to claim 6 or 7, characterized in that that the organs in which the intermediate shafts are stored are the end bottoms of the drum. 8098 11/0285 9. Apparatus according to claim 5, 6 or 7, characterized in that each of the end bottoms of the drum with a circular Opening is provided into which the ends of the intermediate shafts extending inside the drum are guided, that these intermediate shafts have rolling elements which bear against the fixed shaft, and hubs which at the openings of the end bottoms, and which intermediate shafts with play in special, in planes mainly parallel with End plates lying on the end bottoms are stored, which are rotated at an angle in relation to one another in these planes can that one of the intermediate shafts is supported in the end plates in an opening which is elongated in the radial direction and that this is influenced by a centrifugal device in the radial direction of the drum. 10. Apparatus according to claim 9, characterized in that the rolling elements are roller bearings, for example ball bearings. 11. Apparatus according to claim 9 or 10, characterized in that the special end plates outside the end bottoms of the Drum, and each is held in position by means of a spring which affects the end plates in such a way that a protruding part, of which rests against a cam disk, the cam disk lying at one end is fixed, while the other is in communication with an adjusting member. 12. Apparatus according to claim 9, 10 or 11, characterized in that the centrifugal device is inside the drum and has a swivel block on a rotatably mounted swivel arm that this swivel arm is under spring action rests against one end of the lever whose 80981 1/0285 other end under the influence of the block against the hub of the Rests intermediate shaft, which is mounted in an elongated opening in the end plates. 13. Apparatus according to claim 12, characterized in that the centrifugal device has a further pivot block has on a swivel arm which is mounted diametrically opposite the first swivel arm, and which swivel arm over a connecting link is connected to the first pivot arm in such a way that the two pivot blocks move during their pivoting out are mainly diametrically opposite. 14. Perforating electrode system for a device after a or more of the preceding claims for perforating electrical stencils, characterized in that the Perforating electrode is stationary. 15 · Perforating electrode system according to claim 14, characterized in that characterized in that the supply circuit of the perforating electrode is switched off in the rest position of the drum. 16. System according to claim 14 or 15, characterized in that the perforating electrode has an insulating handle owns. 17 · System according to claim 16, characterized in that the handle is designed as a plate with a T-shape is. . Ιδ. System according to one or more of the preceding Claims and with a perforating electrode holder and a perforating electrode arranged therein, characterized in that that the perforating electrode holder is made of electrically insulating material with a guide for receiving and holding the perforating electrode in place. 80981 1/0285 19. System according to claim 1Ö, characterized in that that the guide of the perforating electrode holder has such a shape that the underside of the crossbar of the T-shaped Perforating electrode handle, the penetration depth in the Perforating electrode holder limited. 20. System according to claim 19, characterized in that the handle of the perforating electrode and the guide of the holder are asymmetrical about their longitudinal axes, 21. Sys-.em according to one or more of the preceding Claims, characterized in that a power supply pin is present in or on the holder, the starting of the Drum of the device is influenced and is arranged to be in contact with the conductive parts of the perforating electrode and to press this electrode against the template attached to the drum. 22. Apparatus according to one or more of the preceding claims, characterized by means for locking the Starting device of the device when removing the drum. 80981 1/0285