DE1902142A1 - Facsimile production facility - Google Patents

Description

59 64-68 / Kö / S
F 19 845

Convention Date:
January 16, 1968

Printing Developments International, S.A., Panama, R. de P. '

Facsimile reproduction facility

The invention relates to a device for facsimile reproduction, in which a copy sheet and a sensitized photographic film sheet scanned synchronously with one light beam each and when scanning the Copy sheet's perceived values are converted into a signal with which controls the intensity of the other light beam for exposing the film sheet to the image content of the copy sheet.

In U.S. Patent 3,109,888 there is a facsimile reproduction system described, in which a copy sheet in the form of a color slide between the both curved sides of a frame is clamped so that it is a cylindrical Forms the surface that is in the beam path of a stationary scanning beam with an axis perpendicular to its axis and intersecting this axis is arranged. By swinging the frame about the axis of the cylindrical surface through a given angle relative to a reference angular position causes the beam to be a single scan line or on the sheet line writes. The sheet is then swung back, in which no scanning takes place, brought back to the reference Xage. Between The frame is incremented by one step for each line scan Shifted direction of the axis of the cylindrical surface, so that on the co-

9 0 9 0 3:;:, υ 9 3 2

pieblatt successive line scans can be written in the form of a grid.

The scanning beam is when passing through the color slide through the Ibn values modulated in color and intensity. From the modulated beam various electrical color coraponent signals are derived, which control the currents of corresponding glow lamps, so that the intensities of the exposure beams generated by these glow lamps accordingly being controlled. The individual exposure beams are each on a separate one Zone of a drum directed, synchronous with the, oscillating movement and the incremental axial displacement of the frame relative to the exposure beams rotated and axially shifted stepwise so that the exposure beams sensitized photographic film sheets based on the Drum are mounted in the named zones, scan in a grid and ■ as a result, different color separation images of the Color slide originals are exposed.

This known device has the disadvantage that it is difficult to Copy sheet, if it is large, clamp in the frame so that it is in his Shape of the ideal geometric cylinder surface is adapted with the desired accuracy. -

Since with this device per drum revolution a complete forward and backward movement of the frame and the copy sheet takes place the film sheets take up less than half the circumference of the drum so the backward movement of the frame can take place when the exposure beams fall on an empty surface of the drum. Otherwise this would Rays when the copy sheet is illuminated during the backward movement of the Expose a false image on the film sheets. The requirement that the film sheets do not take up more than half the drum circumference, but is disadvantageous because half of the drum circumference is unused remain. -

The invention is therefore based on the object of the known facsimile reproduction device to the effect that copy sheets of large (as well as small) dimensions with good accuracy of an ideal cylinder surface be adjusted.

It should also be made possible 'that the film sheet more.

9098 36/0932

occupies than half the drum circumference and / or the ratio between the Size of the scanning area of the copy sheet and the size of the scanning areas the film sheet or the filra sheets can be adjusted »

Then a circuit arrangement for re-igniting a glow lamp will be created after their deletion »

Briefly stated, the following is in order to achieve these objects according to the invention provided: a cylindrically shaped copy sheet is used during two consecutive Revolutions of a drum carrying sheets of film synchronously with this in the first revolution forward and in the second revolution backward swung. The copy sheet is line scanned while it is swinging forward and the perceived tonal values are converted into corresponding intensity modulations of light rays, those of glow lamps are generated and scan the film sheets, so that on these color separations of the original can be exposed. During the second rotation, the GQfcwlampen are extinguished by transistor circuits that generate an ignition voltage pulse to reignite the lamps. Furthermore, during the second Rotate the copy sheet and the film sheets one step each axially displaced so that raster scans are congruent on all sheets be generated. Furthermore, there are means for setting the enlargement ratio intended.

The copy sheet is bent into a cylindrical shape by pushing it against a stencil surface is pressed in such a way that the sheet is partly of this surface is supported and partly in the beam path of the scanning light beam protrudes. The axial displacement of the sheet relative to the scanning beam takes place by moving the sheet over the template surface.

Exemplary embodiments of the invention are described in detail below with reference to the drawings. Show it:

Figure 1 is a plan view of an embodiment of the device according to the invention, being part of the facility to simplify the drawing has broken away;

Figure 2 in an enlarged plan view of a part of the device, according to Figure 1;

FIG. 3 is a front view (in one indicated by the arrows 3-3 in FIG given level) of the part of Figure 2; 9 0 9 8 3SZf) Q ^ 9

FIG. 4 is a side view (in one indicated by the arrows 4-4 in FIG given level) of the device according to Figure 1;

FIG. 5 shows a section (in one given by the arrows 5-5 in FIG Level) of the device according to Figure 1;

Figure 6 in plan view the broken away in Figure 1 part of the Einrich-. ■■ = tion with the drum, the glow lamps and the circuits here for ur; and

FIG. 7 shows the circuit diagram of one of the circuits in FIG.

In Figure 1, an electric motor is arranged on a foundation or frame 10, which drives a shaft 12 which is longitudinally mounted in the bearing 13 and which is connected at its right end to a 2s1 gear 15 at constant speed. On the shaft 12 a rotating with this drum 16 is fixed to the four axially spaced sensitized photographic FiImblätter 17 - 20 results (Figure 6), of which in figure 1 only the sheet 17 overall> is shows. The individual sheets 17-20 each encompass the drum 16 over more than half of its circumference.

On one side of the drum 16, a projector carriage 25 is arranged, which is displaceable on guides 24 parallel to the drum axis. The carriage 25 carries four projectors 27-30 (FIG. 6) each with a glass lamp 26 and optics for bundling the light emitted by the lamp into an exposure beam. Of the projectors 27-30 exposure beams are generated in the individual axial zones of the drum 16, in which the FiIm- 17 v leaves - directed attached 20th When the drum is rotated, the carriage 25 is moved axially to the right by a small step during the second of two successive drum rotations in pairs by the dashed line 32 in FIG. 1) and can be designed in a manner similar to the step switching mechanism described in US Pat. No. 3,288,925.

The glow lamps of the projectors 27-30 are (FIG. 6) via jump scanning circuits 35 and corresponding cables 37-40 are connected to a unit 41, in which various color component image signals supplied via a cable 42 can be electronically color treated. For the unit 41 can be a Color signal handling system such as that in U.S. Patent 2,873

909836/0932 *

or U.S. Patent 3,194,883 can be used. In of the unit 41 are three separate electrical input signals which the Blue component, the green component and the Eot component of the sampled Represent tonal values of a colored original image, a tonal range compression, a color correction masking, an undercolor removal as well as other treatments and thus yellow, magenta, cyan and black signals obtained which are supplied to the projectors 27, 28, 29 and 30, respectively are so that the light rays of the Güeilampen these projectors on films 17, 18, 19 and 20, respectively, of yellow, magenta, cyan and black separation images of the colored original.

The input signals for the unit 41 are obtained in the following way: '

The rotational movement of the shaft 12 (Figure 1) is in the gearbox 15 in the ratio 2: 1 and then transferred to a shaft 45, which in a mounted on the foundation 10 bearing 46 is mounted so that this Shaft 45 performs one revolution for every two revolutions of shaft 12. .

At the right end of the shaft 45 are a main cam 47 and an auxiliary cam 48 attached. The guide surface of the cam 47 guides a cam follower roller 49 (FIG. 4) which is arranged at the outer end of a crank arm 50 the inner end of which is fixed to the left end of a crankshaft 51 which is mounted in bearings 52, 53 which are fastened to a carrier 54 arranged on the foundation 10. At the right end of shaft 51 a crank arm 55 with a circular arc-shaped longitudinal slot 56 is attached. This slot receives a set screw assembly 57 which can be turned on and off at will along the slot.

The adjusting screw arrangement 57 serves as a pivot bearing for the lower end of a drive rod 60, at the upper end of which a similar pivot bearing with an adjusting screw arrangement 61 is provided. The arrangement 61 sits in a circular arc slot 62 in the outer end of a drive plate 63 which forms the radially outer part of an angle lever 64. As well as the assembly 57, the adjusting screw arrangement 61 can turn the assembly by loosening the set screw, move to the desired setting and re-tighten the screw in any slot and be fixed d ^"1 It..

9098 36/0932 ■ *

The radially inner end of the angle lever 64 is encompassing on one Rocking shaft (not shown) attached to both ends by balls is mounted in ball joints at the end of the shaft and in ball joint bolts 70 sit in holes 71 at the two horizontal ends of a Stand 72 are arranged on the carrier 54. There is one on the rocker shaft Drum sector assembly 75 having a hub 76 mounted on the shaft, a curved cylinder edge 77 and this connecting with the hub radial webs 78 and 79 and a side web 74 are arranged. The left end. (Figure 2) of the Hub 76 has an upstanding head 80 (Figure 4) in its top there is a channel part 81 in which an angular motion transmission rod 82 is arranged. The rod 82 and the channel part 81 are by means of a Screw 83 attached to head 80. As shown in Figure 2, the rod 82 is standing with its largest part of. the drum sector assembly 75 to the left.

The entire sector arrangement can be moved back and forth by moving it back and forth of the drive rod 60 are swung around the oscillating shaft.

On the left side (Figure 2) of the sector arrangement 75 is an .uxchtprojektor 90, which (Figure 4) is carried by a platform 91, which is supported by a ball 92 on the carrier 54 and its inclination with respect to this by a fine adjustment screw arrangement 93, the screw of which engages the front end of the platform, is adjustable. The projector 90 generates a stationary scanning light beam in a beam path indicated by the dashed line 94. This light beam is directed onto a scanning head 95 which is separated from the front end of the projector 90 by the gap 96. : ■ _ ■. "

As best seen in Figure 2, the edge 77 has the sector arrangement 75 a part reaching from the side web 74 to the left, which is stiffened by triangular webs 97. The left transverse edge 98 of this edge part is located to the right of beam path 94, from which, however, it is only a short distance, namely, a few hundredths of an inch away. The outer surface 100 of the rim 77 is so precision machined that it can accurately define a sector forms a geometric circular cylinder surface which penetrates the gap 96 and the axis of which coincides with that of the oscillating shaft and perpendicularly intersects the axis of the beam path 94 of the light beam from the projector 90.

The edge surface 100 serves as a template surface for a copy sheet in Form of a rectangular color slide 105, from whose color image the color separation

.909836 / 0932

images are to be produced. The sheet 105 is in contact with the Stencil surface 100 attached so that its two side edges 106, 107 with the generating line of the geometric surface formed by the template surface Fold the cylinder surface together and that between these bands the over the Part of the sheet located on the stencil area through the area through this area formed base is bent so that it largely corresponds to the ideal cylinder surface, i.e. the desired shape of the copy sheet. "" ".-

As shown in Figures 2 and 3, the sheet 105 is placed on the stencil surface 100 attached so that a left part ITO of the sheet transversely into the Gap 96 protrudes into and over this, so that it is in the beam path 94 of the scanning light beam is located. Over the entire extent of the part 110 the sheet 105 is not supported by the stencil surface. Despite the lack of support, however, ensure the rigidity of the blade and the The fact that the left edge 98 of the stencil surface is close to the beam path 94, so that the unsupported part of the sheet 105 in the The point of intersection with the beam path 94 is negligible from the ideal shape of the geometric cylinder surface deviates.

Immediately on the left transverse edge 98 of the template surface 100, the Sheet 105 in contact with this surface by a clamping device in In the form of an elastic strip 115 held in tension by an attachment zone 117 on the surface 100 on one side of the sheet 105 to an attachment zone 118 on surface 100 on the other side of the sheet is enough. The Strip 115 in the circumferential direction across sheet 105.

For example, an elastic band can be used for the strip or bracket 115 that on its underside at the clamped ends with adhesive coated, on the other hand uncoated in the part resting on the copy sheet is. Because the strip 115 attached to the stencil between his Ends taut, he presses the underlying part of the sheet 105 into firm contact with the stencil surface 100. "On the other hand, there the copy sheet and tape are not attached to each other Sheet by overcoming the friction between it and the strip Force can be moved in the transverse direction under the strip.

To shift the copy sheet 105 in the transverse direction in this way,

. "9098 38/0932

.β- 1992142

is the left transverse edge 119 of the sheet between the curved edge 120 one Drum egg gate arrangement 121 and a curved clamping rail 122 (Figure 5) clamped by means of this rail and the copying edge 119 in threaded holes Screws 123 screwed in the edge 120 are attached to the edge 120

is pulled on the opposite side. The sector arrangement 121 is located a of the radiation

how e the e ~ ■ - -

ganges 94 ata "—de" sector arrangement 75 and is generally similar to the latter in that its edge is connected by radial webs 124, 125 and a side web 126 to a hub 127 on an oscillating shaft coaxial with the oscillating shaft of the sector arrangement (not shown). Further, the outer surface 128 is adapted to the edge of the sector assembly 121 of the geometric Kreiszylin- defined by the template surface 100 on the sector assembly 75 ψ derfläche. A difference between the two sector arrangements is that the arrangement 75 is mounted on a stand 72 that is stationary in the transverse direction, while the arrangement 12T is mounted on a slide 130 (FIG. 5) which is mounted on guides. 131 and 132 can be displaced transversely in the direction perpendicular to the axis of the beam path 94. Further, the rod 82 (FIG. 2) transmitting angular movement is attached to the sector assembly 75, while the rod 82 is slidable in the transverse direction within the channel portion 133 of the sector assembly 121.

The transverse drive of the carriage 130 of the sector arrangement 121 takes place by a sine lever linkage 135, which couples this slide with the slide for the glow lamp projectors. This linkage exists in part (FIG. 1) from a strut protruding from the side of the carriage 25 and a long rod 141, on the one hand to the strut 140 and on the other hand is articulated at the radially outer end of a ratio arm 142. Of the Arm 142 is attached to the foundation 10 at its radially inner end Pivot bearing 143 pivotable. In the middle part of the arm 142 there is a curved longitudinal slot 144 that receives a set screw assembly 145. This arrangement forms a pivot bearing for the right end of a short one Rod 146, which with its left end on one of the carriage 130 to the outside standing strut 147 is hinged. The set screw assembly 145 can by loosening the adjusting screw, moving it to the desired position and reassigning it the screw arbitrarily along the slot 144 and fixed will.

In a 'sine lever linkage of the type described, the ratio is The linear movements of the rods 141 and 146 are approximately equal to the ratio

909833/0 9 32

1902H2

the distances between the articulation point 143 of the pivot bearings of the rods 141 and 146 on the one hand and the ratio arm 142 on the other hand. Through selective Adjustment of the adjusting screw arrangement 145 in the slot 144 can do that The ratio of the linear displacements of the rods 141 and 146 is set as desired will.

The auxiliary cam 48 actuates a microswitch 150, which thereby selectively is opened and closed. A cable 151 connects the switch 150 with the jump scanning circuits 35, so that * these by the switch accordingly being controlled.

The described arrangement works as follows:

It is assumed that the dimensions of the color image to be reproduced from a copy sheet 105 are χ in the circumferential direction and y in the transverse direction of the stencil surface 100. These directions correspond to the circumferential direction x ¹ and the axial direction y ¹ on the surface of the drum 12 on which the film sheets 17-20 are attached. It is assumed that the color separation images to be exposed on these film sheets have the same shape, but in a larger format, than the original color image on the copy sheet 105. Such a congruence between the color separation images and the original color image results when the following equations are satisfied:

aV = V, (1)

XX ¹

aD = D ... (2)

Therein: a denotes the enlargement ratio, V the linear speed in the direction χ of the scanning beam of the projector 90 on the copy sheet 105, V the linear speed in the direction x 'of the exposure beams on the film sheets 17-20, D the single step length' in the direction y of the transverse movement of the ¹ sheet 105 and D, the single step length in direction y ^{1 of} the relative axial movement between the drum 12 and the exposure beams of the glow lamp projectors.

Equation (i) is satisfied by having the set screw assembly 57 (Figure 4-) in the slot 51 so that during the first of two consecutive revolutions of the drum 12 (Figure i) of the rod 60 the sector assembly 75 upwards at such an angular velocity

90 98 :, ü / 09 32

oscillates that the linear scanning speed of the beam 94 on the copy sheet 105 is 1 / a of the linear scanning speed of the exposure beams the drum 12 is. In addition, the set screw assembly 61 is im Slot 62 is adjusted and the film sheets 17-20 on the circumference the drum 12 arranged so that the period of time during which the beam 94 scans the color image on sheet 105, with the lapse of time, during which the exposure beams scan across the film sheets, collapses.

Equation (2) is satisfied by having the set screw assembly 145 in the slot 144 so that a transverse displacement of the carriage 25 by the amount 1 by the sine lever linkage results in a transverse displacement of the slide 130 is translated by the amount 1 / a.

In this way, when both equations (1) and (2) are satisfied, becomes the scanning raster 94 on the copy sheet 105 in its form, but in a larger format, by the scanning raster of the exposure beams on the film sheets duplicated. The enlargement ratio 'a can of course be due to the mentioned adjustment options can be changed as desired.

After the setup is set up in this way, the Carriages 25 and 130 are arranged so that the optical paths of the exposure beams cover the right edge parts (FIG. 1) of the film sheets 17-20 and the beam path 94 of the scanning beam the left edge (Figure 3) of the copy sheet 105 detected. Then the light sources and the electrical part of the device as well as the motor 11 are switched on, so that the drum 12 rotates and scanning of the color image on the relevant copy sheet 105 begins.

During two consecutive pairs of revolutions of the drum 12 a full effective line scan of the color image is performed. During the first rotation in each case, the cam 41 (which rotates at half the speed of the drum 12) drives the linkage 49, 50, 51, 55, 60, 63 on, so that the sector assembly 75 over a predetermined angle from their Reference angular position is swung upwards. This swinging movement of the an-order 75 is transmitted through the rod 82 to the sectional arrangement 121, see above that this swings upwards by the same amount.

The upward swinging motion of assemblies 75 and 121 causes the beam in beam path 94 across in a line or row

9 0 98 35/0932

1902U2

the image of the copy sheet 105 scans down. The beam is at Passage through the copy sheet in the J color and intensity modulated by the scanned Tbn values of the original image. Then the Beam into head 95 where (in a known manner) the color and intensity modulation is converted into blue, green and red component signals which via the cable 42 to the treatment unit 41, where the QeIb, magenta, cyan and black signals are derived from these input signals, via the jump scanning control unit 35 to the projectors 27, 28, 29 or 30 arrive. The last-mentioned signals control the flow of current through the Glow lamps of the projectors, so that the light rays of these glow lamps are intensity-modulated accordingly. As a result of this modulation and of the rotation of the film sheets under the jets, so that each jet is on the corresponding sheet carries out a line or line scan, expose the individual rays on the associated film sheets each have a line of detail, the content of which is obtained from the simultaneous line scanning of the Copy sheet 105 originates and part of the extract image on the relevant Film sheet forms.

As mentioned, the processes mentioned take place during the first of two consecutive revolutions of the drum 12 in pairs. During the second rotation, the cam 47 and the from this powered linkage the sector assemblies 75 and 121 down in the reference angular position swung back. In this backward swinging movement, probes the beam 94 over a portion of the copy sheet 105 that has already been scanned. if Therefore, an effective scanning of the copy sheet took place during this swing-back movement, this would result in a false exposure of the film sheets 17-20 by the beams of the projectors 27-30. To such a record To prevent misinformation, the cam 48 operates during the second rotation of the drum 12, the micro switch 150, the thereby causes via the unit 35 that the glow lamps 26 in the projectors 27-30 are extinguished and consequently the exposure beams of the projectors are blanked or switched off.

The device according to Figure 1 thus works with so-called "jump scanning", which has the main advantage that the film sheets 17-20 can be placed around the drum 12 that they completely or take for the most part. Without this ■ jump scanning, the wrong exposure could of the film sheets during the backward stroke of the sector assemblies 75 and 121 can only be avoided by timing this backward stroke

909338/0932

1902U2

lies in the interval before the radiation beams fall on an empty surface of the drum between the two edges of the sheets of film placed around the drum. However, in order for this interval to be long enough to encompass the full backward stroke of assemblies 75 and 121 , the portion occupied by the applied film sheets would have to be limited to less than half the circumference of the drum.

During the respective second revolutions of the drum 12 are also the carriages 25 and 130 are advanced by one step. And that moves while the switching mechanism 31 moves the carriage 25 by a small amount Step axially to the left so that the beams from the glow lamp projectors are subsequently scan a new line on the film sheets. The step movement of the slide 25 is moved by the sine lever linkage in a smaller left transverse movement step of the slide 130 and the sector arrangement mounted thereon 121 (Figure 2) translated. Although the sector portion 121 through the rod 82 rotationally or angularly with respect to the transverse direction Fixed arrangement 75 is fixed or locked, the arrangement 121 step to the left relative to assembly 75 by sliding rod 82 in its seat in the movable sector assembly.

Since the left sand of the copy sheet 105 is clamped in the sector arrangement 121, moving this arrangement to the left one step the copy sheet 105 is also pulled one step to the left so that it is set to a new scan line in the beam path 94. The cylindrical curved copy sheet performs this gradual movement by moving it over the Template surface 100 of the arrangement 75, which is stationary in the transverse direction, slides and slides under the strip 115 which yields the copy sheet presses against this surface. In this way, the copy sheet is progressively pulled to the left over one scan cycle until it is aligned with his most of it is located to the left of face 100, so that it passes through this face is no longer supported. Since the sheet 105 is somewhat stiff and the left edge 99 of the surface 100 is very close to the beam path 94 of the scanning beam and there also the part that is still resting on the surface 100 of the sheet 105 in the vicinity of the 'edge 98 by the clamping strip 115 against If this surface is pressed, the part of the sheet 105 covered by the scanning beam path 94 'remains adapted to the ideal shape of the geometric cylinder surface with negligible distortion. The device according to figure

909836/0932

19Q2U2

thus enables the acceptable reproduction of original color images, which are much larger than the images obtained with the known scanning mechanism reproduced according to said U.S. Patent 3,110,888 can be. ■

At the end of the second revolutions of the drum 12, the actuated Cam 48 the microswitch 150, whereby the glow lamps via the unit 35 26 of the projectors 27 - 30 are re-ignited or switched on » During the next and following pairwise revolutions in the scanning cycle the processes described above are repeated,

The jump scanning unit 35 consists of similar circuits, and one for each of the projectors 27-30, all of them through Microswitch 150 can be controlled in parallel. The circuit diagram of the corresponding The circuit for the glow lamp 26 of the projector 27 is shown in FIG. ·

The glow lamp is connected by lines 160 and 161 between a DC voltage source of +180 volts and ground. The cathode of the glow lamp is in series with a diode D _p , which in turn is in series with two parallel circuit branches, consisting of the collector-emitter path of a transistor Q ₁ , in series with a resistor 162 and the collector grid of a transistor Q in series with a resistor R, lies. The image signal on the line 37 is fed to the base of the transistor Q via a gate stage 163 which either passes or blocks the image signal under the control of a control signal supplied from the movable contact 165 of the microswitch 150 via the line 164. Said control signal also reaches the base of transistor Q ₅ via line 166 and resistor 167 in order to control its conductivity.

Furthermore, between the 180 volt DC voltage source and ground is the Series connection of the primary winding 17 0 of a voltage multiplication pulse transformer 171, a charge storage capacitor 172 and the collector-emitter path of a transistor Q. The secondary winding 173 of the transformer 171 is connected to the anode lead 160 and the cathode lead 161 of the Glow lamp 26 connected via a resistor R or a diode D, the so

3 * 5

is polarized that its forward direction points away from the cathode of the glow lamp. _{A diode D 1 is} connected across the primary winding 170 of the transformer. The capacitor 172 is through a discharge resistor Änd R ₁ over-

90983S / 0932

-η- 19 02 H 2

bridges. The base of the transistor Q is connected through a resistor 174 to the movable contact 165 of the microswitch 150 connected.

During the first of two consecutive pairs of revolutions of the drum 12 becomes the movable contact 165 through the auxiliary cam 48 is connected to the Pest contact 180 connected to a DC voltage source of +10 volts. During the second turn- will through the cam 48 in cooperation with a biasing spring 181 the contact 165 to a voltage source of -0.5 volts connected to a SL Fixed contact 183 switched. '

The operation of the circuit according to Figure 7 is as follows:

As mentioned, both the copy sheet and the film sheets are line-scanned during the first of two consecutive pairs of revolutions of the drum 12. In the course of this scanning, the movable contact 165 is connected to the fixed contact 180, whereby the gate stage 163 is supplied with a DC voltage of +10 volts, so that the image signals can pass to the transistor Q. This transistor is controlled in its conductivity in accordance with the image signals, so that the current consumption of the glow lamp 26 is controlled accordingly. At the same time, the signal of +10 volts reaches the. Transistor Q-, which is thereby switched into the highly conductive state, ie effectively made a closed switch. The purpose of this is that if the image signal fed to Q drops temporarily to such a low value that Q alone would no longer be able to keep the glow lamp 26 in the ignited state, the glow lamp owing to the current drawn via the auxiliary path with the resistor R_ and the transistor Q ₀ nevertheless remains switched on.

During the second of the two revolutions of the drum 12, the movable contact 165 is connected to the fixed contact 183, so that the gate 163 and the transistor Q _{0 have} a voltage of -0.5 volts, thereby extinguishing the glow lamp 26 and its light beam will.

At the end of the second turn and at the beginning of the first - the next two The movable contact 165 switches revolutions from the contact 183 again on the contact 180 back, whereby the conditions are restored that the glow lamp 26 remains ignited after reignition. Without additional measures, however, the time of the ignition of the Gliram-

9098 36/0932

lamp 26 indefinite, since he was affected by an arbitrary event, such as that the gas in the glow lamp has sufficient ionizing radiation Form of e.g. a cosmic ray or other energetic Particle receives, would depend. Such uncertainty about the The ignition point is in the circuit according to Figure 7, however, by switching of contact 165 from contact 183 to contact 180 avoided.

When the movable contact is switched back to the plague contact 180, the +10 volt signal is fed to the transistor Q, the conductivity of which is thereby switched from low to high. The increased conductivity of transistor Q causes a switching current pulse to flow through primary winding 170 of transformer 171 into capacitor 172 and charge it. As a result of this current pulse, a high-voltage surge is induced in the secondary winding 173 of the transformer 171, which pushes the cathode voltage of the glow lamp 26 down to a value at which the resulting voltage between the cathode and anode of the glow lamp ignites it. With its peak value between the cathode and anode of the glow lamp, this surge voltage can generate a voltage of the order of magnitude of 300 volts or more. As soon as the glow lamp is ignited in this way, it remains in the ignited state, since at this time the transistors Q and Q _{2 are} again conductive so that the operational requirements for generating a sufficient glow discharge voltage on the glow lamp are given.

During the reignition of the glow lamp 26, the resistor R- prevents the glow lamp in the circuit with the glow lamp itself and the transformer secondary winding 173 from drawing too much current. The diode D prevents at the same time that the transistor Q ₁ . is tensioned in the blocking direction. The diode D-, which fulfills no function during reignition, prevents in normal operation that too much current is diverted through the secondary winding 173, bypassing the glow lamp.

The current pulse in the primary winding 170 and the corresponding voltage pulse on the glow lamp are terminated when the capacitor 172 is fully charged. After that, a small continuous current flows through the primary winding 170, the resistor E ₁ and the transistor. borrowed contact 165 is connected to the fixed contact 180. -If the, moving-, then borrowed contact from contact 180 to contact 1! 83. switched ■; ■?

9098 36/0932

is, the current in the primary winding 170 and in the transistor Q drops to zero and the diode D ₁ attenuates the reverse or Sp err shock from the transformer away, which would otherwise be generated by this drop in current. When the transistor Q ₁ is "opened" by a switch by switching over the movable contact 165, the capacitor 172 discharges through the resistor E ₁ , so that it is in readiness for the generation of the next re-ignition pulse.

The circuit according to FIG. 7 thus ensures the reliable re-ignition of an extinguished glow lamp with precise timing. The circuit is its applicability is not limited to the jump scanning technique described here. For example, it can also be used with great benefit to employ such devices where the image signals obtained by scanning the copy sheet temporarily pass through during the scanning of the copy sheet Fixed signals are replaced, which produce a self-color printing effect in the finished reproduction and which by means of a so-called pull-out or "Knock-out mask", as described in an earlier application by the same applicant (US Serial No. 649 621), can be selected. In this case if a blanking control signal derived from the knock-out mask is used instead of microswitch 150, gate 163 is omitted and the control signal is used Capability of transistor Q selectively through either that of the sampled

Image signal derived from copy sheet or a signal selected by the mask fixed value.

The Seproduktionseinrichtung can also be designed so that it without jump scanning, in which case a gear 15 works with it a gear ratio of 1 ti, a carriage drive 31, the pro Single rotation of the drum 16 moves the carriages 25 and 130 by one axial step each, as well as film sheets 17-20 of such a small format are used, that they occupy less than half the circumference of the drum on the drum 16, with the film sheets angularly so on the drum attaches that the rays of the glow lamps 27 - SO scan an empty surface of the drum during the backswing stroke of the copy sheet 105.

Furthermore, it is not absolutely necessary that, as described above in connection with the jump scanning, the axial advance of the carriages 25 and 130 takes place by one step in each case during the second of two revolutions of the drum 16 that follow one another in pairs. Rather,

909836/0932

since the step size of this advance movement is very small compared to the Each line scan range of xopie sheet and film sheets is that Slide advance at any time within the duration of the successive Tpommel revolutions in pairs without this the color separations produced on the film sheets are significantly influenced. That is, as long as it is ensured that there are two consecutive pairs Revolutions of the drum 16 the carriages are advanced by one step and the delay or time interval between the start each such advance step and the beginning of the corresponding two Drum revolutions remains constant over the entire scanning cycle, this is The time interval as such is not critical and can be set as required bar. So you can easily step forward into the interval the first instead of the second of the corresponding two drum revolutions.

909836/0932

Claims (11)

Claims 1. Facsimile reproduction facility using a copy sheet with the picture object to be reproduced on the one hand and at least one sensitized photographic film sheet, on the other hand, in synchronism with. ever a light beam can be scanned rasterförraig in orthogonal directions and the values of the image object perceived when the copy sheet is scanned be converted into an electrical signal - that the FiIm sheet-scanning light beam controls so that an image of the subject is exposed on the film sheet, characterized in that, that the light beam scanning the copy sheet (105) from a light projector (90) in a fixed beam path (94) via a separating gap (96) is directed at a photosensitive assembly (95); that on a drum sector arrangement (75) is arranged on one side of the beam path is angularly movable relative to the beam path about a pivot axis intersecting this at right angles, but not transversely movable and has a curved surface which forms a cylindrical surface (too) which is concentric to the pivot axis and penetrates the separating gap; that by a pressing device (HS) .the copy sheet is pressed against this surface in such a way that that it is bent while adapting to the shape of the cylinder surface and in In the transverse direction partially protrudes into the separating gap in order to be detected there by the beam path (94) of the scanning light beam, this pressing device a transverse movement of the curved copy sheet, relative to the sector arrangement (75) allowed; that by a vibratory drive (47 .. ·) the sector arrangement about the pivot axis is swung back and forth that the in the Beam path the protruding part of the copy sheet is scanned by the scanning light beam synchronously with the scanning of the film sheet (17 ··.) In one scanning direction will; and that by a shifting arrangement (121, 130 ...) the copy sheet synchronous with the scanning of the film sheet in the second. Scan direction moved transversely and thereby "scanned" by the scanning light beam in the transverse direction will. ■ 2. Device according to claim 1, dadu roh geke η η ζ ei chn et that άζά Verseht eheasiordsung a transversally movable "slide (ISO), the * saS of the opposite side of the beam path" (94) like di « 90983670932 Sector arrangement (75) is arranged, one arranged on the carriage Plague tensioning device (121. ».), Which protrudes into the separating gap Part of the copy sheet grasped at its side edge, as well as a carriage feed mechanismMis (31 »135 ·. ·)» Which gives the carriage the synchronous Tr ans uppercase movement. 3. Device according to claim 2, characterized in that the clamping device has a sheet support (121) which is angularly movable relative to the beam path (94) vm the pivot axis and has an outer surface adapted to the shape of the cylinder surface (100), a device (122 ...) for clamping of the side edge (119) of the curved Iopie_ sheet on this outer surface and an oscillating mechanism (82 ...), which oscillates the sheet support synchronously with the oscillating movement of the sector arrangement to and fro about the pivot axis. 4. Device according to claim 3, characterized geke η η -zei ch η et that the oscillating mechanism contains an angular movement transmission member (82) which connects the sector arrangement (75) with the sheet support (121) that these two parts (75, 121 ) are rigidly coupled to one another in terms of angular motion, but in terms of transyersal motion there is a dead corridor between them. 5. Device according to one of the preceding claims, characterized in that the film sheet (17 ...) is mounted on a drum l (16) which is rotated and axially displaced relative to the exposing light beam (glow lamp 26) that the film sheet of this light beam is scanned in the two orthogonal directions synchronously with the scanning of the topie sheet. 6. Device according to claim 5, characterized in that the oscillating drive for the sector arrangement from the rotary drive Drum (16) but a lifting mechanism (57, 60 ...) is controlled, the one allows variable setting of the ratio between the linear scanning strokes in one scanning direction on the copy sheet on the one hand and the file sheet on the other as desired; and that the sheet displacement arrangement (121, 130 ...) is controlled by the axial drive of the drum (16) via a mechanism (135) which allows the ratio between the transverse displacement of the copy to be varied as desired. 9098 36/09 3 2 sheet on the one hand and the relative axial displacement between the drum and exposing light beam on the other hand allows. 7. Device according to claim 5 or 6, characterized in that the sector arrangement (75) each during the first from two consecutive pairs of revolutions of the drum (ΐβ) swung out of a reference angular position and during the second of the two Irommel revolutions is swung back into the reference angular position; that the exposing light beam (glow lamp 26) is extinguished during one of these two drum rotations and that the relative axial displacement takes place intermittently between the drum and the exposing light beam in such a way that in each case during one of these two irommel revolutions no such axial displacement occurs. _S is carried out at 8. The circuit arrangement for a device according to any one of the preceding claims "the exposure of the film sheet through the light beam of a neon lamp whose current is controlled by the image to be reproduced representing electrical signal. dadu τ cfe characterized in that a controlled by the electrical signal first transistor controls the current flow of the glow lamp and thus the intensity of the light beam ' that the glow lamp current is interrupted by a Sehalterelaasnt for a certain time interval while releasing the light beam; and that by a circuit with a second transistor at the end of this time interval, the glow lamp is switched on again by applying a surge voltage to it which exceeds the operating voltage of the glow lamp, so that the glow lamp ignites. 9. Circuit arrangement according to claim 8, characterized e i c h ne t that the switch element feeds the signal to the first transistor interrupts. 10. Circuit arrangement according to claim 8 or 9, characterized in that a voltage multiplication transformer is coupled on the secondary side via the glow lamp, ^ the primary side is coupled in series with a current-absorbing capacitor and the second transistor to a power supply, the second transistor upon termination of the Switches the extinguishing interval from a high-resistance to a low-resistance state in said series circuit; and that an arrangement is provided 9098 36/0932 is over which the capacitor is in the intermediate interval between two consecutive deletion intervals. 11. Circuit arrangement according to one of claims 8 to 10 for a device according to claim 7, characterized in that
that the switch element is controlled by the rotation of the drum,
that it interrupts the glow lamp circuit in each case one of two drum revolutions in pairs. 90 98 36/09 32