DE1572234A1 - Manufacturing device for printing forms suitable for contact printing - Google Patents

Description

PATENT ADVERTISER E PIpl- ^ nQ- MARTI N LICHT

Dr. REINHOlD SCHMIDT

PATENTANWÄLTE LICHT, HANSMANN, HERRMANN *

β Mönchen 2 ■ THERESIENSTRASSE 33 Dipl.-Wirtsch.-Ing. AXEL HANSMANN

1R79 99A Dipl.-Phys. SEBASTIAN HERRMANN

'Monks, 10. March 1967

Your mark Our mark

ADDRESSOG-RAPH-IvlULTIGRAPH CORPOHATION Cleveland, Ohio 44117
Battitt Road 1200
V. St. A.

Production device for printing forms suitable for contact printing.

This invention "relates to copier machines and on machines for exposing printing forms, which find use for contact printing. In particular "refers the invention relates to a device to the movement and position of the copy or printing form "sheet with respect to to sense and control the original sheet to be copied, thereby interrupting the copying or Lrucite mold manufacturing process is possible when the operational flow is disturbed.

For easier understanding, the description refers to the production of printing forms, of which copies with : if "lithographic" methods can be obtained.

Patent attorneys Dipl.-Ing. Martin Licht, Dipl.-Wirtsch.-Ing. Axel Hansmann, Dipl.-Phys. Sebastian Herrmann 8 MÖNCHEN 2, THERESIENSTRASSE 33 · Telephone ι 292102 · Telegram address: Lipatli / MOnchen

Bank details: Deutsche Bank AG, Munich branch, Dop.-Ka »» e Vlkluallenmarkr, account no. 70/30438 Bayer. Vereinsbank Mönchen, Zweigst. Oskar-von-Miller-Ring, account no. 882495 Postal check account: Munich No. 163397

RAD ORIGINAL-Oppenauer BOro: PATENT ADVOCATE DR. REINHOLD SCH.MIDT

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Of course, the production can also be more ordinary Photocopies can be made.

The so-called contact pressure, which in the sense used here relates to office machines, requires the known one Technique of exposing a photosensitive sheet using the object to be copied; this item will normally is referred to as "original" and creates a latent image on the photosensitive sheet which develops after exposure in order to be able to use it as a copy or as a printing form for other duplication processes.

There are many materials that can be used for copy sheets and / or. Find printing forms use; it is only necessary that they are sensitive to light. When producing the image on a printing form it is necessary to develop and fix the latent image or to direct the printing form to others ./eise as intended treat. In the description of this invention, reference is made to an electrophotographic printing form which can be exposed by known electrostatic methods. The exposure device for electrophotographic printing forms has a developing device in which either dry or liquid developer is applied to the printing form is applied; the application of a dry developer is followed by fixing with the aid of high temperatures. In the cases where the printing form is used as a "lithographic" printing form,

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the electrophotographic sheet must also be treated with a conversion solution "to make the printing form sheet different To impart the ability to absorb color and moisture.

In the case of an exposure device for printing forms which are used in a contact printing process, it is necessary to insert the original into the machine in order to achieve a contact printing. In conventional machines of this construction, it is necessary that the original and the printing form are carefully folded by hand and inserted into the machine. After exposure, the sheet is removed, after which the original can be removed; then the printing form is manually placed in a machine to develop the printing form. This method is very time-consuming and uneconomical, although the exact position of the sheets during exposure is ensured and the possibility of moving the original through the developing device where it could be destroyed is avoided.

There are many conventional devices in which an original and a copy sheet are passed through a copying process; however, the process is like this, Jaia, if the sheets are not separated, no harm will be done to the original. In those processes in which the. If original damage is inflicted, the procedure takes place in a separate stage. Lie is the present invention

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new in that it relates to a machine-created separation in a process that damages the original would inflict. if the original were treated together with the copy sheet. · To date, no device has been more conventional Design known, which relates to the device according to the invention shown in the description.

This invention makes use of the knowledge that separating devices, although they generally work reliably, they can be disturbed and that a security system is created must be in order to prevent an original fed to the machine from being destroyed. tion to preserve. According to the invention, therefore, the material passing through the machine is diverted so that the copy or Printing form cannot be accidentally destroyed by the original running through the machine.

The present invention is therefore intended to provide an imaging device in which the printing form and the original is passed through the exposure point for the printing form, after which the printing form is guided by a last one Processing stage is supplied without J manual operations having to be made. Sin another feature of the automatic exposure device of the invention is that the original is protected from accidentally the developer - drive through because the original is separated from the printing form after the exposure has been carried out. The exposure device for printing forms can be used as a single part of a

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larger machine use, where the completed printing form is used to reproduce a number of copies, for example by lithographic techniques. The printing form is moved and used in a mechanical way. If the printing form is used in a device in which it is conveyed by means of the exposure device for duplication without human intervention, with multiple copies being made of the printing form, then the printing form should be with an unfinished image or with an imprecisely placed image from the exposure device can be separated to prevent a large number of bad copies from being made. The main aim of the present invention is to provide an improved, automatic exposure device for printing forms, with which it is possible, during exposure, to avoid unusual conditions caused by poor '

th printing form, or which the original ' could destroy, detect and interrupt the exposure process, so that the destruction of the original or the processing and forwarding of a bad printing form is avoided. The device according to the invention throws the layer from the printing form and original then out again, if the original from the print .. form was not separated after exposure. The printing form is also ejected if it hits the Original has been inaccurately aligned.

A contact printing device according to the invention has an

909881/1262 original

Order of drive rollers and guide elements to the To move the original sheet and the printing form sheet along an original path and a printing form path in a certain position relative to one another and lead. The device has an inlet for the original and a printing form feed device, which feeds unexposed printing forms in accordance with the feed of an original from a stack. One introduced into the machine Original touches a sensing switch in a control circuit for a mechanism that controls a printing form before the original, so that the later separation of the sheets is easier. The machine has additional guide elements and v / alzen on which the two webs are on a common Brings together web on which the original is brought over the unexposed printing form sheet, so that these two Sheets can be fed as a unit through the exposure device. There is also provided a device to to separate the exposed printing form from the original when the unit emerges from the exposure device, and to separate the separated Move sheets along separate tracks. The path along which the original is guided lets it out of the machine to a reception center. The path for the printing form is provided with an ejection device which can be moved laterally is if the printing form passes through the separating device without the separation being carried out exactly.

From the description of the preferably illustrated embodiment of the invention it is apparent that a display and output

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ORIGINAL INSPECTED

Steering device is provided in order to ensure that an original sheet is safely returned on its path and guided around the other processing areas of the printing form. In the event that there is no sheet in the path of the original ", indicating that the original sheet in a safe place, the guiding or steering device forwards all copies back to the operator, bypassing the for Weiterbearbei-> tung leading car. The present invention works on the principle that two tracks are provided, one for the original from which a copy is made and one for the exposed copy made in the machine If the steering device fails, there are two possibilities:

1. Both the original and the copy get stuck of the original and are ejected from the machine. No harm is done in this pail, except that a copy sheet is wasted.

2. Both the original and the copy sheet get caught in the path of the copy and appear to become another Process stage fed. In this case, however, there is a guide or steering mechanism in the path of the copies provided, which bypasses this process stage; this device is only ineffective if the filling device is the original or the original and

scans the copy in the path of the original. 909881/1262

The invention is illustrated with the aid of the "attached drawings" wrote.

Fig. 1 is a diagrammatic sectional view of the invention Machine;

I ¹ Ig. Figure 2 is an enlarged detail view of the sheet separator with the inlet opening for the two different webs; and

Fig. 3 is a view of the sheet separating mechanism shown in side view in Figs is.

The drawings represent individual parts of a working training

j implementation of the invention to the extent that its structure and operation

'drifted becomes apparent. A base 10 of the machine carries itself vertically extending frame and housing parts, such as the side wall 12. A table surface H is attached to the front of the machine and can be reached by an operator. An original can be positioned on this table top, like this that it can be easily inserted into a pair of drive rollers 16. An electrical wiring diagram is not shown in the drawings as it will be understood by those skilled in the art. It is It is clear that the various electrical components of the machine including the drive rollers 16 power is supplied.

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The drive rollers 16 grasp the original and guide it into a guide 18. When the original document in the guide 18 occurs, it strikes the switching arm of the switch 20.

When an original and a copy sheet are joined together by hand, they can be one before the other or exactly placed one on top of the other as desired by the operator. If no separation is desired, then exact alignment of the original and copy sheet can be brought about. The separating device in the preferably illustrated embodiment of the invention requires that the printing form somewhat comes to lie in front of the original to be copied. Therefore, the switch 20 is operated to turn the drive rollers 16 suddenly stops what happens by opening a clutch that drives the rollers. This halt brings the original regarding the Switching arm of the switch 20 in a certain position. This situation can be precisely determined. Then a copy or print form is made brought into a certain position, after which the two sheets are moved towards each other. ^

A certain type of copy material which is used for the device shown consists of a printing form which, after it has been produced, can be used for a "lithographic" printing system. Such a material is therefore stored in subdued light when it is not in use, since it is photosensitive. A stack of such photosensitive material is inside the

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ORIGINAL D

Device covered by the table top 14 · The individual sheets of this stack are called sheets 22, "or as a whole described as stack 22 ".

The switch 20 ″ is in a control circuit for controlling a drive for a feed roller 24. The 7 / roller 24 corresponds largely to the paper feed rollers used in offset printing machines. With the help of the rotating '.VaIze 24 Therefore, the top sheet 22 of the stack is moved into an opposing pair of drive rollers 26. Take the rollers 26 the copy sheet or the printing form and move it into a guide 28. A switch 30 ·, the switching arm of which is transverse to the guide 28 is actuated by the edge of the sheet 22 as it moves through the guide 28. The operation of the switch 30 always happens when the leading edge of the copy sheet has reached a certain position in the guide 28. Consequently is the position of the leading edge of the copy or printing form in the guide 28 with respect to the leading edge of the original document precisely set in the guide 18. The cycle is so controlled that by actuating the switch 30, the drive rollers 16 are set in rotation again, whereupon they together with the movement of the copy sheet move the original document. The position of the individual switches to one another is such that the speed of the drive rollers 16 and 26 move the original and the copy sheets to each other so that the copy or printing form sheet is slightly in front of Original comes to rest.

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The copy sheet occurs after passing switch 30 between an electrostatic device 32 and a drive roller 34. On the surface of the sheet 22 is by means of Device 32 applied in a known manner an electrical charge to form an electrostatic image. The sheet will then passed by the roller 34 into a guide 36. The guide 36 and the guide 18 guide the respective sheets so that they come to rest on top of each other and be moved in this position. “When switches 20 and 30 are set exactly, it comes Copy sheet first at this point and is therefore slightly in front of the original sheet.

An exposure device 38, preferably a light source of high intensity, is provided to the superimposed To expose sheets so that a discharge is made on the copy sheet, with the exception of the areas which are below the word or picture lines lie on the original. This happens up to the degree of shadow created by these parts will. This is a very well-known exposure process. A belt drive system 40 with an endless belt and individual Drive roller is used to drive the sheets on top of one another firmly pressed together along the surface of the exposure device 38 to move.

At the outlet side of the exposure device 38 is a Guide 42 attached, through which the superimposed sheets to a separating device 43 are moved. The separator

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ORIGINAL INSPECTED

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ι 43 is arranged and designed so that it is the front end of the The copy sheet and pulls it away from the original. The separation takes place around the two sheets for the further procedure to move in two separate tracks.

Referring to Pig. 3 the separating device 43 is shown individually. A pivotable hook arm 44 acts as a passive one Steering device. The hook ends 45 are positioned so that they catch the end of the sheet pushed out of the guide 42, The arm 44 is pushed forward by the sheet and rotates about its pivot point, thereby removing the captured end of the sheet moved along a curved path.

A stripper arm 46 cooperates with the separator arm; it is movable outwards towards the hook ends and releases the captured end of the copy sheet from the separation arm when it is in the appropriate position.

The separator arm has an H-shaped arrangement which is formed by a slot 48 and an opposing slot 49. The arm 44 is pivotable by means of an axis 52, while the scraper arm 46 is mounted on a rod 54. The axes 52 and 54 are as in Pig. 1 and 2 is shown, mounted so that the pivoting movement is driven by a forward • ne moving sheet causes the wiper arm to lie over the bridge portion of the H-shaped arm 43. These overload

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Gert rotary motion guides the end of arm 46 with respect to the hook ends 45 to the outside. In this way, any sheet of paper in the hook of the arm 44, although it does not loosen itself, will be caught by it combined rotating and wiping movement repelled.

A coil spring 56 on rod 52 pushes the combination of the arm and separator upwards against the outlet end of the guide 42, while the drive of the moved by the guide 42, superimposed sheets the pivoting movement of the separating device 43 from the starting position to the working position, which is shown by dashed lines in Fig. 2 is effected. When the printing form 22 is gripped by the separator and is pushed down when the separating arm moves around its axis, it describes an arc. At a At a certain point before the end of the pivoting movement of the separating arm, the blade 22 loses its holding contact with the hook ends 45 Due to its pre-tension, which was brought about by the pivoting movement of the separating arm, it snaps upwards.

The inherent stiffness of the paper is also used to keep the original in its path of movement through the guide 42. It can be seen that the path of the superimposed sheets between the exposure device 38 and the belt 40 in the form runs a curve which is caused by the shape of the endless belt and by the curved surface of the device 38. These Curve shape has the tendency to move the superimposed sheets through the guide 42 upwards. These are pulled up

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Dead force prevents the original from falling when · the * copy sheet is gripped by the hook ends and down is deducted. This creates two tracks, as shown by the dashed arrows in Pig. I which the original and can be seen by the solid arrows representing the copy sheet.

A guide 58 receives the original moved upward and guides it along a curved path back to the area of the machine where it was initially introduced.

A guide 60 in the form of a slightly curved sheet forms a guide surface for receiving the extension of the copy sheet and causes the copy sheet to deflect into a pair of drive rollers 62. At the outlet of the rollers 62 there is a pivotable one Guide body 64, which in the function in about a Railway switch resembles. The guide body 64 normally has a position which is shown in FIG. 1 with solid lines. Each copy sheet, which is moved by the drive rollers 62 and into the guide body 64, is therefore in the direction of Table top 14 led back.

When the guide body or guiding device 6k is brought into position shown in dotted lines, the copy sheet moves upward through a pair of drive rollers 66. From there, the sheet can be moved to another area of the machine which is not shown is, get which, however, the

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Copy sheet is treated in a manner that is normally the same as the 'Original would hurt. The original document can therefore not be fed into the rollers 66.

The invention provides a device to select the location of the guide body 64 so that the guide extension is only brought into the position shown with dashed lines if the original is safely on its. Lane 58 is guided.

The drive rollers 68 are positioned so that they either pick up a sheet from the path of the original, which is given by the guide 58, or a sheet from the path of the copy or the printing form, through the position of the guide body 64 shown by solid lines is shown. Any sheet or sheets that enter drive rollers 68 are directed into guide 70 and to a pair of unloading rollers 72 where the sheet can be removed by the operator.

One arm of a switch indicator 74 is arranged to indicate each sheet in the guide 58. One not shown Circuitry is controlled by guide 74 so that when the arm of the switch senses a leaf, the guide body 64 is then and only then pivoted to the position shown in Fig. 1 with dashed lines. When the separator 43 works as it should and an original and a copy sheet moved out of the guide 42 and separated cleanly,

then the original indicates via the switch 7k that it has safely reached this position, the guide body 6k moving the copy sheet so that it gets into the rollers 66 and is further processed from there.

In the event that the separating device does not work accurately and both sheets get into the path of the copy sheet and into the rollers 62, there is no sensing by the switch 6k, whereby the guide body 6k remains in the position shown by the solid lines. Both the copy and original sheets are then fed to the outside of the machine by means of the rollers 68 through the guide 70 without being treated by any further process.

Finally, if by any accident the copy sheet k3 falls off the separator 43 too early (or for any reason), both the copy and original sheets will enter the guide 58. The indicator switch 7k indicates the presence of sheet material in the guide 58 and the guide body 6k moves so that a copy sheet can be further processed. This movement, however, has no effect since there is no copy sheet in the path 60.

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Claims (8)

PATENTANWÄLTE DipUng. MARTIN LICHT PATENTANWÄLTE LICHT, HANSMANN, HERRMANN J1T LUoV-MMI 8 MÖNCHEN 2 · THERfSiENSTRASSE 33 A f DipUMrtsch.-Ing. A X E L H A N S M A N N Dipl.-Phys. SEBASTIAN HERRMANN ADDRESSOGRAPH-MULTIGHAPH CORPORATION. Munich, 10. March 196? Cleveland, Ohio 44117. . Your reference Our Ztidien Babbitt Road 1200 Aj / di Patent application: "Manufacturing device for printing forms suitable for contact printing" PATENT CLAIMS 1. Manufacturing equipment for those suitable for contact printing Printing forms with a device? To expose a photosensitive Copy sheet by an original, characterized in that an exposure device (38, 40), a processing station for Copy sheets and a receiving point (14) are provided that by means of a guide device (18, 36) the original and the Copy sheets are guided lying one above the other on a common path along the exposure device (38, 40) that a separating device separates the sheets from each other when they leave the exposure device (38, 40) that the sheets on different tracks in different places from each other 909831/12 12 Patent attorneys Dipl.-Ing. Martin Licht, Dipl.-Wirtsch.-Ing. Axel Hansmann, Dipl.-Phys. Sebastian Herrmann 8 MUNICH 2, THERESI ENSTRASSE 33 ■ Telephone 2? 2] 02 · Teiegrcmm address: Lipaiii / Me.näiets Bank details: Deutsche Bank AG, Mönchen branch, Viktualienmarkf Dop.-Cashier, Konio-Nr, 70 / 30ί · 33 Bayer. Vereinsbank Munich, branch. Oskar-von-Miller-Rino, account no. 882495 Posticheck account: Munich No. 16335.7 V5I ^ W DR.REINHOLD SCHMIDT are moved away, that an indicator (74) is provided in the path to determine the separation of the sheets from one another, and that an ejector (64) in accordance with the indicator (74) is effective if the separation of the sheets from one another has not been indicated , to return the copy sheet and the original to the receiving device (14) together. 2. Manufacturing device according to claim 1, characterized in that that the separating device (43) extending paths from a first guide (58) and from a second guide (60) consist that the ejector (64) is arranged in the second guide (6o), the ejector in a working position to guide the sheet material out of the second guide (60) and a rest position is effective, and that by means of a control device responsive to the display device (? 4) the ejection device (64) is only held in the rest position when the display device is sheet material in the first guide (58) indicates. 3, copying machine according to the contact printing method for exposing a photosensitive copy sheet from an original, characterized by an exposure device, a guide device (18, 36) for feeding an original and a copy sheet one above the other to a common path which passes the exposure device, a separating device ( 43), UJj! the Elättfr, she pondered? l: lo leave the exposure device, BATH ORIGINAL to separate from each other, a guide device (6o) to guide the copy sheet after separation from the original on a To guide the path for the copy sheet from the separating device (43) to a further processing stage, a guide device (58) to guide the original after separation from the copy sheet on a path for the original, wherein continues the web from the separating device from the area used for the further treatment of the copy sheet, and indicating and directing means (74, 64) to move each sheet in the copy path from the copy sheet processing area if no original sheet is scanned in the path (58) of the original. 4. Copying machine using the contact printing process for exposing a photosensitive copy sheet from an original, characterized by an exposure device, a guide device (18, 36) for superimposing an original and a copy sheet a common path, which passes the exposure device, to be fed to a separating device (43), in order to separate the sheets from one another as they leave the exposure device, a guide device (6O) to guide the Copy sheet after separation from the original on a path for the copy sheet from the separator (43) to another To direct processing stage, a diversion (70) from the web for the copy sheets, a guide device (64) having a first position around that in the path for the copy sheets located sheets to the diversion (70), and a second position in which the sheets from the web for the 909881/1262 Copy sheets are guided in the further processing area, a guide device (60) to guide the copy sheet after separation from the original on a path for the copy sheet from the separation device (43) to a further processing stage, a display device (7 ² O for an original in its path, and means responsive to the indicator (74) for maintaining the guide (64) in the second position only when the indicator has displayed sheet material. 909881/1262 Blank page