US3207896A

US3207896A - Copy machine with ultraviolet exposure and infrared development sections

Info

Publication number: US3207896A
Application number: US148584A
Authority: US
Inventors: Thomas A Meaney; Rosenblum Philip
Original assignee: COPY RES CORP
Current assignee: COPY RES CORP
Priority date: 1961-10-30
Filing date: 1961-10-30
Publication date: 1965-09-21
Anticipated expiration: 1982-09-21

Description

Sept. 21, 1965 Filed OCT.. 50. 1961 T. A. MEANEY ETAL COPY MACHINE WITH ULTRAVIOLET EXPOSURE AND INFRARED DEVELOPMENT SECTIONS 4 Sheets-Sheet l wer Sept. 21, 1965 T. A. MEANEY ETAL 3,207,896

COPY MACHINE WITH ULTRAVIOLET EXPOSURE AND INFRARED DEVELOPMENT SECTIONS 4 Sheets-Sheet 2 Filed OCT.. 30, 1961 Sept. 21, 1965 T. A. MEANEY ETAL 3,207,896

COPY MACHINE WITH ULTRAVIOLET EXPOSURE AND INFRARED DEVELOPMENT SECTIONS Filed Oct. 30. 1961 4 Sheets-Sheet 3 100 jig 56 f f fg 70) 4? Sept. 21, 1965 T. A. MEANEY ETAL 3,207,895

COPY MACHINE WITH ULTRAVIOLET EXPOSURE AND INFRARED DEVELOPMENT SECTIONS Filed oct. so, 1961 4 sheets-sheet 4 United States lPatent O 3,207,896 CDPY MACHINE WITH ULTRAVIOLET EXPOSURE AND INFRARED DEVELUPMENT SECTIONS Thomas A. Meaney, Costa Mesa, and Philip Rosenblum,

Newport Beach, Calif., assiguors to Copy Research Corporation, Newport Beach, Calif., a corporation of California Filed ct. 30, 1961, Ser. No. 148,584 16 Claims. (Cl. Z50-65) The invention relates to dry copy machines generally and particularly t-o a unique machine having utility in the production of high quality duplicates of original transparencies such as X-rays, said duplicates bein-g on positive paper or film.

While it is true that the prior ar-t has offered many 'and varied types of duplicating machines, it is a unique feature yof the herein disclosed invention that it provides high quality reproductions of all continuous tone transparent originals. The reproductions provided may be on positive paper or they may be transparent film copies. The particular invention has found wide acceptance espe- :cia'lly in the medical field such as with doctors, radiolvogists and the like,V primarily due to the fact that even the most finite details of X-rays are readily reproducible on paper or on yprojectable film copies.

Specifically, the herein disclosed machine comprises an exposure section wherein an original and congruently arranged copy is exposed to a source of ultravi-olet radiation in a manner calibrated with time. Thereafter, the 4copy is exposed to an infrared radiation source under lcontrolled time and temperature conditions to provide accurate, high quality copy development.

Further features of the structure herein disclosed nclude means for controllably circulating a cooling medium through the exposure and developing sections, said cooling means being arranged to co-act with the energizing of the Ideveloping section during a determined time period whereby the infrared radiation source will lbe brought to .a stable temperature level resulting in a thigh quality .developed copy. The disclosed invention further provides unique controllable material transport arrangements accurately settable from a speed standpoint and responsive to the important variables such as density of the original, exposure and devel-opment in controlled lspacial relation t-o the source of radiation, physical size lof the copy as it effects development time, and exposure and development temperature level.

Additional features of the invention relate to improved physical relation between various of the operating parts of the machine structure which also contribute to the high quality reproduction mentioned as Well as providing economy of manufacture, long service life and relative ease of maintenance.

The invention further comprehends the incorporati-on of a direct current motor drive arrangement having unique circuit and speed control adapted to contribute importantly to the production of said high quality duplicates as well as offering .a unique motor control arrangement, per se.

These and other Iobjectives of the invention will become apparent in the course `of the following description vand from an examination of the associated drawings wherein:

FIGURE l is a perspective view of a preferred emhodiment of .the copy machine hereunder consideration;

.FIGURE 2 is an enlarged, fragmentary perspective view with the covers removed of the operating parts of the arrangement;

FIGURE 3 is a sectional view taken along line 3 3 of FIGURE l;

ice

FIGURE 4 is a sectional view taken along line 4--4 of FIGURE 2;

FIGURE 5 is a fragmentary .sectional view taken along line 5-5 of FIGURE 2;

FIGURE 6 is a schematic wiring diagram of the control -circuit employed in the machine;

FIGURE 7 is .a fragmentary elevational vie-w illustrating a modification of the invention; and

FIGURE 8 is a fragmentary schematic wiring diagram of the circuit employed in the modification of FIG- UREY 7.

`Describing the invention in detail and directing attention to FIGURE l, it will be noted that the copy machine includes a case 2 having an exposure section indicated generally at 4 and a developing section indicated generally at 6. A power connection lead 8 which may be any conventional connection is provided for appropriate association with the ordinary outlet plug which provides an alternating current power source. A rst switch 10 comprises a main on and off switch to initially supply power to the machine. A second switch 12, which will hereinafter be considered in detail, is used for manual operation of the developing section. Control knob 14 and control knob 16 are arranged for manual variation and their operation will be explained in detail in reference to the particular control cir-cuit employed in the invention.

Turning now to FIGUR-ES 2 and 3, it will Ibe noted that the exposure section 4 compris-es a plurality of rollers 20, 22 and 24. The rollers 20, 22 and 24 'are preferably arranged to approximately form the points of an isosceles triangle whereby a central exposure drum 26 m-ay be disposed intermediate the rollers and longitudinally parallel therewith. The roller-s 20, 22 and 24 are each mounted on

appropriate shafts

28, 30 and 32, said shafts having their opposed ends journally mounted in vertical walls '34 and 36 as, for example, at 38 (FIGURE 5). It will be particularly noted that the journalled mounting of the shaft 30 comprises a pillow block 40 appropriately disposed in the open-ended slot 42 in the

walls

34 and 36. .It will thus be apparent that the roller 22 and its associated assembly may be easily lifted and removed from journal association with the mentioned walls. A continuous resilient tensioned belt 44 is arranged to encircle por'- tions of the peripheral surfaces of the rollers 20, 22 and 24 and to thereafter encircle a major portion of the peripheral sur-face of the exposure drum 26. By virtue of the inherent tension in the -belt 44, the drum 26 is brought into abutting engagement with the belt 44 and the rollers 2o and 22, whereby the drum 26 is fixedly maintained in floating rotational association with the rollers 20 and 22.

lNoting further that the rollers 20 and 22 define therebetween an opening 46, said opening 46 communicating with the outside of the machine and exposing t-o the opening 46 a minor segment of the surface of the drum 26. As illustrated in FIGURE 5, a stripper plate 48 is inserted in the opening 46 and its opposed end-s slot mountied as at 50 to the

walls

34 and 36 and divides the opening 46 int-o an entrance trough 52 and exit trough 54. Additionally, the stripper plate 4-8 is provided with a curved lip 56 which gently rides the peripheral surface lof the drum .26. The slot mounting of stripper plate 48 provides easy assembly and disassembly thereof.

It will be understood that the drum 26 is composed of radiation transmitting material such as glass and has dispoed therein a source of ultraviolet radiation such as the fluorescent lamps 58. The lamps 58 areappropriately carried by the

walls

34 and 36 as, for example, by the bracket plates 60. The shaft 32 of the roller 24 extends through the wall 34 whereat it is operatively connected to a power source, here illustrated as a conventional direct current motor 62. Thus, upon energizing of the motor 62, rotational movement is transmitted to the shaft 32 and to the fixedly connected roller 24. The motion jof the roller 24, as illustrated by the arrow in FIGURE 3, frequently induces movement of the tensioned belt 44 which, in turn,transmits rotative movement to the rollers 20 and 22 as well as the floating drum 26. It will be understood that the isoscles arrangement of the rollers 20, 22 and 24 above described provides positive maintenance yof the drum 26 in desired physical position within the machine and further contributes to easy maintenance thereof by the fact that the roller 22 as well as stripper ,plate 48 may be readily removed from the respective mounting slots, thereby exposing the entire exposure .section 4to view .and facilitating easy assembly and easy machine maintenance. Additionally, the triangular arrangement of the rollers contributes to even stress distribution via Athe belt 44 throughout the various rollers and the carried drum additionally contributing to long service life. It is further desirable to manufacture the rollers of an appropriate non-corrosive material such as 'aluminum in view of the fact that the machine in use in many medical facilities is liable to be subjected to corrosive atmospheres.

Turning now to FIGURE 4, it will be noted that the developing section 6 is here illustrated. Initially, the developing section 6 comprises a cover defined trough 70 .which is in communication with a first pair of vertically

related rollers

72 and 74. The

rollers

72 and 74 have their opposed e'nds journally mounted in appropriate pillow blocks 76 which are demountably positioned in appropriate vertical slots within the

walls

34 and 36. The roller 72 is provided with a gear 78 at one end thereof, said gear being fixedly associated with hollow shaft 80 (FIG- ,URE 2) `of the roller 72. The shaft 80 has another gear 82 lixedly connected to its opposed en-d, said gear 82 being in mechanical engagement with a gear 84 which is fixedly connected to the adjacent end of a hollow shaft 86 of the Iroller 74. A second pair of vertically related

rollers

88 and 90 are arranged for journalled mounting to the walls 'V34 and 36in a manner identical with

rollers

72 and 74. The roller 88 is provided with a central hollow shaft 92 `which is provided with gear 94 fixedly carried on one end thereof. The shaft 92 is likewise provided with a second gear 96 fixedly carried on its opposed end and in v geared engagement with a gear 98 fixedly carried by the adjacent end of hollow shaft 100 of the roller 90. A variable speed direct current motor 102 is carried outboardly of the wall 34 and is provided with a drive shaft 104 which, in turn, fixedly carries thereon a driving gear 106.

YThe driving gear 106 is in conventional engagement with the invention, the purpose of which will be hereinafter described, relates to the fact that the gear 78 is provided `with more teeth than the gear 94. As a result of this structure, it will be apparent that the gear 94 will rotate at a faster rate than the gear 78. In a preferred embodiment of the invention, it has been found desirable to provide a tooth differential between the gears of 1, whereby the left hand pair of rollers as seen in FIGURE 4 will be urged to rotate at a slightly faster rate than the right hand pair of rollers illustrated in the same figure.

Noting the referred to pairs of rollers are in horizontal spaced relation, it will be understood that a source of infrared radiation such as the infrared lamp 112 is positioned intermediate said pairs of rollers and in longitudinal parallel relation therewith. An appropriate electrical lead 115 provides power for the lamp 112. A reector 114 is carried by the

walls

34 and 36 immediately above the lamp 112 and is preferably cupped down- Wardly to partially embrace said lamp. A tray 116 is carried by the

walls

34 and 36 below the lamp 112 and in approximate vertical alignment between the

rollers

72 and 74 and the

rollers

88 and 90. In the preferred embodiment of the invention, the tray 116 is made of reiiective material whereby infrared radiation will be readily reflected therefrom. An exit trough 118 defined by the arcuate plate 120 is arranged to communicate with the

rollers

88 and 90.

Again referring to FIGURE 2, it will be noted that a blower arrangement 122 is mounted adjacent the rear portion of the machine and comprises a motor 124 and connected centrifugal fan arrangement 126. The fan 126 is in direct communication with a plenum chamber 128 which, in turn, communicates with the exposure section 4 as at 130 and the developing section 6 as at 132. When the blower 126 is operating, it will therefore be understood that cooling air is circulated through the drum 26 of the exposure section and through the developing section, including passing through the

hollow shafts

78, 86, 92 and 100. The purpose of the circulating cooling medium will be hereafter discussed in detail.

Directing attention now to FIGURE 6, which illustrates schematically the wiring arrangement employed in a preferred embodiment of the invention, the leads 8, as noted above, provi-de for conventional connection to a power source such as 110 volt, 60 cycle alternating current. The arrangement may further be main fused as at in the conventional manner. The main switch 10 is located in line 142 and may be closed to energize the entire arrangement. It will be noted that line 144 is connected to the power source ahead of the switch 10 whereby,- on normal plug-in, even though the machine is not operating, power is continuously distributed to transformer 146 the secondary of which, in turn, is connected (not shown) to

filament heaters

148 and 150 of

thyratron tubes

152 and 154. Thus, any requirement for an initial warm-up of the device in periodic use is eliminated once same has been plugged in.

Closing the main switch 10 energizes the ballasts 156 and which immediately energizes the four fluorescent lamps 58 in the conventional manner, thus providing the source of ultraviolet radiation in the exposure section 4. A second line 162 connects line 142 to diode 164 through current -limiting resistor 166. In this wav, the alternating current source is rectified to a half-wave direct current. Line 162 is connected via

lines

168 and 170 to excite the field of motor 62. Current delivered by the diode 164 is also channeled through resistor 172 to a potentiometer 174 which, in'turn, is series connected through line 176, current limiting resistor 177, to the grid of tube 152 via line 184. It will be noted that the potentiometer 174 is variable and its tap position on the associated resistor is manually controlled via knob 16 on the machine. Hence, the voltage level delivered by the potentiometer is controllably variable. The thyraton tube 152 is connected via line 1801 to the alternating current source and connected in series with the motor armature via line 182. Line 176 is tap connected as at 184 to the grid of the thyratron 152 to provide appropriate bias to t-he grid. A capacitor 186 is placed in series in the line V176 intermediate the

lines

182 and 184.

As the armature of the motor 62 rotates, it produces -a counter electromotive force which has a magnitude dethe load at that instant.

The differences in the voltage on the cathode of the tube 152 and on the line 142 control the magnitude of the current which flows through a circuit including the line 142, the resistor 166, the diode 164, the resist-or 172, the

value, the voltage on the grid of the thyratron tube 152 becomes suiiiciently positive relative to the voltage on the cathode of the lthyratron so that the thyratron becomes conductive. This causes current to flow through a circuit, including the line 142, the line 180, the thyratron tube 152 and the armature of the motor 62. The current tiows through the thyratron tube 152 for only a single half cycle since the thyratron tube 152 becomes cut off by the negative voltage on the line 142 in the next half cycle.

During the time that the thyratron tube 152 is conductive, the capacitor 186 becomes discharged bec-anse of the short circuit between the cathode and grid of the thyratron tube. When the capacitor 186 becomes discharged and Vthe thyratron tube 152 becomes nonconductive, a new cycle of operation is initiated to charge the capacitor 186. Upon becoming charged to a suicient particular Value, the capacit-or 186 again biases the thyratron tube 152 to a state of conductivity so as to obtain a flow of current through the thyratron and a discharge of the capacitor 186. The thyratron tube 152 may be accordingly considered to operate as a current control member or a switch.

In this way, the thyratron tube 152 becomes alternately conductive and nonconductive at a rate dependent upon the magnitude of the voltage on the cathode of the thyratron tube. As the voltage on the cathode of the thyratron tube 152 decreases because of an increase in the load on the motor 62, an increaseis produced in the frequency at vwhich the thyratron becomes alternately conductive and Ynonconductive- This produces an increase in the average current through the armature of the motor y62, and a resultant increase in the speed of the motor 6K2. Because of this, the capacitor 186 and the thyratron tube 152 are included in a circuit which regulates the speed of the motor 62 to compensate for variations in the load applied to the motor.

The circuit described above also tends to compensate for variations in the voltage on the line 142. For example, asthe voltage on the line 142 increases, the current flowing through the capacitor `186 increases to increase the frequency at which the thyratron tube 152 becomes tired. This produces an increase in the iiow of current through the motor 62 and a resultant increase in the counter electromotive force produced by the motor. The increase in the counter electromotive force causes the potential on the cathode of the thyratron tube 152 to rise such that a reduction is obtained in the frequency at which the thyratron tube 152 becomes tired. Tlhis in turn causes the speed `of the motor 62 to decrease toward the desired value and to become regulated at substantially the desired value.

Turning to the developing section 6, it will be recalled that a motor 102 is provided as the power source to accommodate roller drive. A second potentiometer 190` again mechanically controllable by knob 14 applied afhalf-wave direct current voltage to line 192. It will again be noted that line 168 is in series connect-ion with the field of motor 102 whereby an exciting voltage is applied thereto. Thyratron 154 is connected via line 194 to the alternating lcurrent source behind switch 12 and is also series convarrangement above described is and functions identically with the control associated with motor 62. However, as

an added feature of motor speed control in the developing section, it is desirable to place a resistor 204 in series in line 192 below the connection to the thyratron 154. The resistor 204 is preferably one having a negative coeicient of resistance in relation to temperature. That is, as the ambient and resulting body temperature of the resistor 204 is increased, the resistance varies inversely, that is, decreases with said temperature increase.

Since the resistor 204 has a negative coefficient of resistance, the voltage on the cathode of the thyratron tube 154 decreases as the ambient temperature increases. Because of the decrease in the voltage on the cathode of the thyratron tube 154, the current flowing through the capacitor 200 to charge the capacitor has an increased amplitude. This in turn causes the thyratron tube 154 to become triggered to a state of conductivity at an increased frequency so as to increase the average current iiowing through the armature of the motor 102. This increase in the average current flowing through the armature of the motor 102 is instrumental in producing an increase in the speed of the motor. The motor is increased in speed since the time required to produce a positive image on the paper passing through the machine decreases as the ambient temperature increases.

Turning to FIGURE 6, it will be noted that a line 210 is connected to line 142 ahead of switch 12. The line 210 is connected via line 212 and through relay switch 214 directly to the blower motor 124. Thus, upon closure of sWit-ch 10, the blower motor is energized and cooling medium is circulated continuously through the exposure section 4 and the developing section 6. It will be noted that switch 12 may be a normally open switch whereby the developing section motor 102 is normally stopped. To energize the motor 102, it is necessary to close switch 12, thus applying current to the thyratron 154. When switch 12 is closed, motor 102 is energized and current is applied to the infrared lamp 112 energizing same. Additionally, relay 216 is also energized whereby relay lswitch 214 is opened, de-energizing the blower 124 and halting circulation of cooling air. Additionally, closure of switch 12 energizes a time-delay relay 218 which is in Series with indicating lamp 220 which, in turn, is placed on the control panel on machine as shown in FIGURE 1 whereby it is visible to the operator. It will thus be understood that manual holding of switch 12 in a closed position energizes the infrared lamp, deenergizes the blower 124 and initiates a time circuit through the lamp 220. In Ithe preferred embodiment, a time-delay of the lamp 220 is of the order of 10 seconds, it having been emperically determined that this time delay will accommodate appropriate heating in the developing section and raising of the temperature of the infrared source to the level required for proper copy development.

As an alternate to employing relay 216, it may be understood that a connection shown by dotted line 224 may be made to a normally closed pole of the switch 12 and directly in series with the blower 124. In this manner, closure of switch 12 to its opposite pole breaks the circuit to the blower and de-energizes same. This alternate circuit arrangement may be employed to eliminate the need of relay 216.

Considering the operation of the initial embodiment, itl will be understood that the operator will close switch 10 which energizes blower 124 and energizes the fluorescent lamps 58 in the exposure section 4. The film to 'be copied together with appropriate copy material is then fed into trough 52 whereby it is engaged by the tension belt 444 and rolled in exposed relationship to the ultraviolet so-urce 58 around the drum 26 and out of the exit trough 54. It will also be understood that the time of `exposure may be preset by the operator by appropriate setting of the knob 16 which controls the potentiometer 174. The desired exposure time is, of course, responsive to the density of the particular transparency which is being duplicated. Thereafter, the exposed copy is separated from the original and the operator closes switch 12 to energize the developing section 6. As noted above, the infrared lamp 112 is immediately energized and the operator maintains the switch 12 closed until the indicating lamp 220 lights. At this point, the operator is advised that the developing section is at the correct temperature level. As noted above, this temperature rise is accommodated because the blower 124 is de-energized concurrently with energizing of the developing section 6.

At this point, the operator feeds the copy into trough 70 which communicates with the first rollers 73 and 86 which are now rotating under the action of motor 102. The

rollers

72 and 74 pick up the copy and transport same through the developing section and over the tray 116. As the copy moves over the tray, it engages the second pair of

rollers

88 and 90 which, likewise, urge the copy to move through the developing section. In view of the fact that the

rollers

88 and 90 rotate at a slightly 'higher speed than the

initial rollers

72 and 74, it will be understood that the copy is tensioned between the two rollers during a major segment of its transport through the developing section. This tensioning of the copy 4accurately locates same in a fixed spacial relation to the source of infrared radiation and further maintains the copy smooth and even throughout a major portion of i-ts transport. In this manner, high quality development of the copy results. Thereafter, the copy is transported through exit trough 118 and out of the machine whereat it may be picked up bythe operator.

After delivery of the developed copy, the operator allows switch 12 to return to its normally open position whereby power delivery is halted to the delivering section 6, die-energizing the infrared lamp 112 and halting the motor 102. Additionally, the blower 124 is now energized and cooling medium again circulates through the developing section 6 and the exposure section 4.

It should be particularly noted that energizing of the blower acts to lower the temperature in the developing section after each developing operation. This is an important facet in developing high quality copies of continuous tone transparencies because it is extremely desirable to maintain the temperature level in the developing section at the correct point so that total heat absorption by various segments of the copy is substantially uniform. Air is also circulated through the hollow shafts of the

rollers

72, 74, 92 and 100 cooling same and avoiding residual heat build-up therein. Continuous energizing of the infrared source causes a constant increase in temperature, and this overheating thereby affecting developing action. Accordingly, it has been found that the best quality reproductions are obtained by raising the developing temperature to the appropriate level accomplishing development and thereafter returning the temperature in the developing section to a level below the desired level after each operation.

In those circumstances where the copy to be developed is transparent, it will be understood that this copy tends to transmit infrared energy while positive paper copies tend to absorb most of said energy. The fact that the tray 116 is reflective, it redirects the transmitted infrared energy to the transparent copy, thereby aiding in its development.

In certain circumstances where the copy to be developed is extremely long, it will be understood that the developing temperature will tend to increase above the appropriate level during developing. In this circumstance, and to avoid over-development and consequent poor copies, attention is referred to the resistor 204. The resistor 204 is physically located in the developing section whereby it is subject to the ambient condition in the `developing section. As noted above, as the body temperature of the resistor 204 increases, the motor 102 is urged to increase in speed. The increase in speed of Ymotor 102 shortens the development time of the long copy whereby a variation in development in the copy is avoided and properly controlling uniform heat absorption. After development, the resistor 204 is cooled by action of the blower and the control circuit will thereafter function in the normal manner. Alternately, the function of resistor 22S in the schematic diagram may be a heat sensor whereby the bias division applied to -tube 154 is varied as a function of the ambient temperature in the developer portion of the machine7 that is, 'this resistor 180 is a thermistor whose resistance decreases as the temperature in the developer chamber increases. This increases the positive potential of the bias division point to tube 154 thereby increasing conduction of the tube and increasing the speed of motor 102 such as to effect uniform development. If desired, the resistor 204 may be eliminated and satisfactory matching operation will be obtained in virtually all circumstances.

Attention is now directed to the modification of the arrangement illustrated in FIGURES 7 and 8. In this arrangement, one motor has been eliminated. Motor 102a and its driving member 106a is again chain connected as at 108a to the sprockets 94 and 7S of the developing section. In addition, shaft 32 of the exposure section 4 is provided with a gear 230 which is also engaged by the chain 108a. Thus, the motor 102a is now operative to drive both the exposure section 4 and the developer section 6. The mechanical structure not illustrated is identical with that of the first embodiment. Referring to FIGURE 8, which schematically illustrates 'the control circuit employed in this embodiment, it will be understood that the circuit arrangement, not illustrated, is identical with that shown in FIGURE 6. Thyratron 152e, potentiometer 174a, and associated circuitry, function to drive the exposure section 6 in a manner identical with that described with previous embodiments. However, thyratron 154:1 and potentiometer 190a are series connected via line 232 in series relation with the armature of the motor 102er. Switch 12a now has its normally closed pole series connecting line 142 to thyratron 152e. In this manner, thyratron 152a normally controls the action of the motor which would drive the entire arrangement at the speed setting of potentiometer 174 which, in turn, would be the appropriate setting for the exposure section 4 and controlled by knob 16. When it is desired to develop an exposed copy, switch 12a is again operator depressed, breaking the power circuit to thyratron 152 and energizing the power circuit via potentiometer 190a to thyratron 15411. After the appropriate heating time elapse, the operator inserts the copy in the developing trough 70 and the motor speed is controlled by action of the thyratron 154a and the entire arrangement is driven at a speed appropriate to the development section 6. Upon completion of development, the switch 12a is released, the blower is again energized and control of the speed of the motor is returned to thyratron 152 and potentiometer 174. f

Thus, it will be seen that the disclosed arrangement provides a unique machine particularly adapted in the reproduction and high quality duplication of continuous tone transparencies. It will be understood that the invention is by way of illustration and not limitation and may be subject to modification without departing from the scope 'of the appended claims.

What is claimed is: 1. In a copy machine for providing a duplicate copy of an original, an exposure section comprising a source vof ultraviolet radiation, means for transporting the origsaw/gaga' 9 tion to cool the same during the exposure of the copy, and means to energize said developer section and concurrently therewith cease the circulation of said cooling medium.

2. A copy machine according to claim 1, and including rst control means to establish and maintain the rate and amount of exposure of the copy in the exposure section, and second control means to establish and maintain the rate and amount of development of the copy in the developing section.

3. A copy machine according to claim 2, wherein the second control means includes means responsive to the temperature in the developing section to vary the established speed at which the second transporting means transports the copy through'the developing section.

4. In a copy machine for providing a duplicate copy of an original, the combination of an exposing section comprising: a radiation passing exposure drum; a plurality of guiding rollers journally mounted to the machine; an endless tensioned belt arranged to substantially circle the respective peripheries of the drum `and rollers whereby the drum is maintained in xedly iloating rotatable relation to the rollers; two of said rollers defining an opening exposing a segment of the periphery of said drum; stripper means disposed in said opening and engageable with the drum whereby said oening is divided into entrance and exit portions; a source of ultraviolet radiation disposed within the drum; a developing section comprising a plurality of pairs of guiding drums in spaced relation to each other and journalled to the machine; a source of infrared radiation interposed between the pairs of guiding drums; means to circulate cooling mediums through said exposing section and said developing section; power means to rotatably drive the respective pairs of guiding drums at differential speeds and at least one of said rollers and thereby induce movement of said belt at the other rollers and drum; and settable control means to energize said source of ultraviolet radiation and said circulating means and said power means; said control means including selectable means to energize said source of infrared radiation and concurrently de-energize said circulating means.

5. A copy machine according to claim 4, wherein said exposure drum and said guiding drums are hollow, said circulating means comprising a plenum chamber, an air blowercommunicating therewith, said chamber being in direct communication with said sections and said drums.

6. A copy machine according :to claim 5, wherein said power means includes at least one variable speed motor, and a power transmission connection to said one roller Iand respective pairs of guiding drums.

7. A copy machine according to claim 6, wherein said power transmission connection includes a driving member, a rst driven member on one of said pairs of guiding drums, a second driven member on the other pair of said guiding drums, said driven members being of different sizes.

8. In a copy machine, a developing section comprising: a first pair of rollers in abutting relation to each other, `a second pair of rollers in abutting relation to each other and spaced from said first mentioned rollers, a source of infrared radiation intermediate said pairs of rollers, copy support means interposed between said pairs of rollers and vertically aligned with the lines of abutting relation of the respective pairs of rollers as seen in elevational view, said support means comprising a radiation reflective tray, and including another reector adjacent said source of radiation, said source being interposed between said tray and other reflector, and power means operatively connected to the respective pairs of rollers to drive same, :said power means being arranged to drive said pairs of rollers at different speeds.

9. A copy machine according to claim 8, wherein said rollers are hollow to accommodate circulation of cooling medium therethrough.

10. In a copy machine, a source of radiation, an entrance trough to receive a copy to be exposed to said radiation source, la first transport means communicating with the trough and operative to engage and move the copy in exposed relation to said source, a second transport means operative to engage and move said copy in exposed relation to said source, both of said transport means being arranged to concurrently engage said copy during a substantial portion of copy exposure to said source under tension during said exposure, and power maintain the portion said copy adjacent the radiation source under tensioning during said exposure, and power means to drive the transport means.

11. A copy machine according to claim 10, and including means to circulate cooling medium in heat-exchange relation with said source and said transport means, and means to energize said source and concurrently therewith, de-energize said circulating means.

12. A copy machine according to claim 11, wherein said power means comprises: a first control means to selectively set the speed of said transport means, and second control means operative to vary said set speed during exposure `and in response to a variation in temperature -level during said exposure.

13. A copy machine according to claim 12, wherein said second control means comprises a temperature sensitive body in heat-exchange relation to said source and to said circulating cooling medium.

14. In a copy machine for providing a duplicate copy of an original,

an exposure section including a source of ultraviolet radiation,

iirst transport means for transporting the original and the copy in a stacked relationship through the exposure section for exposure to the ultraviolet radiation to form a latent image of the original,

a developing section including a source of inrared radiation,

second transport means for transporting the exposed copy through the developing section and in heat exchanging relation to said source to develop the latent image,

cooling means responsive to energizing of said exposure section to concurrently circulate a cooling medium through said exposure section `and developing section to cool the same during the exposure of the original and copy, and

means effective to disable the cooling means when the temperature of the developing section is below a predetermined level.

15. In a copy machine for providing a duplicate copy of an original, v

an exposure section including a source of ultraviolet radiation,

first transport means for transporting the original and the copy in a stacked relationship through the exposure section for exposure to the ultraviolet radiation to form a latent image of the original,

a developing section including a source of infrared radiation,

second transport means for transporting the exposed copy at a particular rate through the developing section and in ea heat exchanging relation to said source to develop the latent image,

control means responsive to the temperature of said developing section to increase the rate at which the copy is transported through the development section whenever the temperature exceeds a particular level.

16. In a copy machine for providing a duplicate copy of an original,

an exposure section including a source of ultraviolet radiation,

rst transport means for transporting the original and the copy in a stacked relationship through the exposure section `at a particular rate for exposure to the sou-ree of ultraviolet radiation to form a latent image of. the original,

a developing section including ra source of infrared radiation,

second transport means for transporting the exposed copy at a particular rate through the developing section and in heat exchanging relation to said :source to develop the latent image,

cooling means responsive to energizing of said exposure section to concurrently circulate a cooling medium through said exposure section and developing section to cool same, and

temperature responsive means in said developer section, said temperature responsive means being keffec- .tive to disable the cooling means when the temperature of the developing means is below a particular temperature and to increase the speed at which the second transport carries the copy through the developing section when lthe temperature exceeds a particular temperature.

References Cited bythe Examiner UNITED STATES PATENTS Carlson Z-'65 Cary 95-77.5 Patience et al. 95-77.5 Bichsel et al S18-331 Frantz 95-77.5 Miller etal 250-- Kaufman -77.5

Reich 95-77.5 Thomiszer 250-65 Crumrine et al. 250-65 Auld 318-331 Nelson et al. 250-65 RALPH G. NILSON, Primary Examiner.

Claims

4. IN A COPY MACHINE FOR PROVIDING A DUPLICATE COPY OF AN ORIGINAL, THE COMBINATION OF AN EXPOSING SECTION COMPRIISNG: A RADIATION PASSING EXPOSURE DRUM; A PLURALITY OF GUIDING ROLLERS JOURNALLY MOUNTED TO THE MACHINE; AN ENDLESS TENSIONED BELT ARRANGED TO SUBSTANTIALLY CIRCLE THE RESPECTIVE PERPHERIES OF THE DRUM AND ROLLERS WHEREBY THE DRUM IS MAINTAINED IN FIXEDLY FLOATING ROTATABLE RELATION TO THE ROLLERS; TWO OF SAID ROLLERS DEFINING AN OPENING EXPOSING A SEGMENT OF THE PERIPHERY OF SAID DRUM; STRIPPER MEANS DISPOSED IN SAID OPENING AND ENGAGEABLE WITH THE DRUM WHEREBY SAID OPENING IS DIVIDED INTO ENTRANCE AND EXIT PORTIONS; A SOURCE OF ULTRAVIOLET RADIATION DISPOSED WITHIN THE DRUM; A DEVELOPING SECTION COMPRISING A PLURALITY OF PAIRS OF GUIDING DRUMS IN SPACED RELATION TO EACH OTHER AND JOURNALLED TO THE MACHINE; A SOURC E