US2896505A

US2896505A - Automatic photo printing machine

Info

Publication number: US2896505A
Authority: US
Inventors: Carl T Nations
Original assignee: NAT ELECTRONICS DISTRIBUTORS I
Current assignee: NAT ELECTRONICS DISTRIBUTORS I; NATIONAL ELECTRONICS DISTRIBUTORS Inc
Priority date: 1955-12-21
Filing date: 1955-12-21
Publication date: 1959-07-28
Anticipated expiration: 1976-07-28

Description

July 28, 195 c. T. NATIONS 2,896,505

AUTOMATIC PHOTO PRINTING MACHINE FiledD ec. 21, 1955 6 Sheets-Sheet 1 INVENTOR. N Clem 7 NH r/o/vs.

July 28, 1959 c. T. NATIONS 2,896,505

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INVENTOR. 6171?; 7T/V/7 T/ONS.

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July 28, 1959 c. T. NATIONS 2,896,505

AUTOMATIC FHO TO PRINTING MACHINE Filed Dec. 21, 1955 6 Sheets-Sheet 5 IN VEN TORB 67751 T NH 7/ 0W5,

July 28, 1959 c. T. NATiONS 2,896,505

AUTOMATIC PHOTO PRINTING MACHINE Filed Dec. 21, 1955 6 Sheets-Sheet e TIMING LMS 2500 INVENTOR. (Ta/PL T NflT/ONS United States Patent AUTOMATIC PHOTO PRINTING MACHINE Carl T. Nations, Orlando, Fla., assign'or to National Electronics Distributors, Incorporated, Orlando, Fla., a corporation of Florida Application December 21, 1955, Serial No. 554,456

12 Claims. (Cl. 88-24) This invention relates to an automatic photo printing machine and more particularly to a machine for automatically printing photographs from negative films.

It is an object of the present invention to provide such a machine which is extremely easy to use and highly efficient in its operation.

A further object of this invention is to provide an automatic printing machine which may be readily used in conjunction with conventional types of photographic enlargcrs.

A still further object is the provision of a photo printing machine which may be adjusted to produce a pre selected number of prints.

A still further object is to provide a mechanism for such machines which will accurately feed a preselected length of printing paper for each printing operation, whereby all of the prints will be of the same size and the printed photographs thereon will be accurately located so that a uniform margin will be provided on each print.

Further objects and advantages of this invention will be fully understood from the following description and from the accompanying drawings in which:

Fig. 1 is a plan view, partly in section, of an automatic photo printing machine embodying my present invention.

Fig. 2 is a sectional side view of said machine.

Fig. 3 is a sectional end view on line 3-3 of Fig. 4.

Fig. 4 is a side view of the operating mechanism for said machine.

Fig. 5 is an enlarged sectional front view of the measuring mechanisms on line 5-5 of Fig. 6.

Fig. 6 is a sectional side view on line 6-6 of Fig. 7.

Fig. 7 is a view similar to Fig. 5 but showing the clutch in its disengaged condition.

Fig. 8 is a side view of the clutch actuating member used in said mechanism.

Fig. 9 is a plan view of the adjustable border mask provided for said machine.

Fig. 10 is a front view of said border mask.

Fig. 11 is a bottom view thereof.

Fig. 12 is a sectional side view on line 12-12 of Fig. 9.

Fig. 13 is a sectional front view on line 13-13 of Fig. 9.

Fig. 14 is an end view of the spool for the unexposed portion of the photographic paper strip.

Fig. 15 is a sectional side view thereof.

Fig. 16 is a side view, partly in section, of the spool for the exposed portion of the strip.

Fig. 17 is a diagrammatic view of the electrical circuit for controlling the operation of the machine.

As illustrated in the drawings, my improved automatic photo printing machine is designed to be used in conjunction with a conventional photographic enlarger of the type which includes a base above which there is mounted a projector having a lens such as indicated gen- 2,896,505 Patented July 28, 1959 may be placed upon the base of such a conventional projector, or the said projector may be placed upon an adjacent supporting surface with the lens 5 disposed above the printing position in the machine.

My improved printing machine includes a base 6 having thereon a compartment 7 for containing a roll 8 of unexposed photographic printing paper strip which is mounted in said compartment, as will be hereinafter more fully described. At the other end of the base 6, there is provided a separate compartment 9 in which the exposed portion of said strip is received and rolled therein into a roll 10. Each of the compartments 7 and 9 are provided with

removable covers

11 and 12, respectively, which rest in suitable notches that border the said chambers to protect the undeveloped printing paper within the said compartments against exposure to light.

The main operating mechanism of said machine is contained between the said chambers 7 and 9 and includes a feed roll 13 which is mounted upon and secured to a drive shaft 14 that is rotatably mounted in suitable bearings in side walls 15 and 16 which extend from a base 17 of the frame for said mechanism. The said feed roll 13 is secured to rotate with the shaft 14 by means of a pin 18.

A pressure roll 19 is rotatably mounted upon a supporting shaft 20 that is secured at its opposite ends to a pair of rocker bars 21 and 22 which are pivotally mounted in side wall portions 23 and 24 that extend upwardly from the walls 15 and 16, respectively; the said rocker bars being pivotally secured to said wall portions by

screws

25 and 26 which provide pivoting studs for said rocker bars.

The rocker bar 22 has an extension 27 which provides a lever handle for manually rocking the said bars 21 and 22 on their pivots and thereby raising the pressure roll 19 to space it from the feed roll 13 when it is desired to thread the machine with the printing paper strip. A hook 28 is pivoted-upon the extension 23, by means of a pivoting stud 29, and is adapted to be swung into engagement with the rocker bar 22 for retaining the pressure roll 19 in raised position and out of engagement with the feed roll 13 while the machine is being threaded.

The drive shaft 14 is driven by means of an electric motor 30 which rotates a driving worm 31 that drives a worm gear 32 which is rotatable on the said drive shaft 14 and is engageable therewith through a clutch that includes a clutch disk 33 which is keyed to the drive shaft 14, a pair of clutch balls 34-34, and a stationary brake disk 35 which is mounted upon the shaft 14 and secured against rotation thereon by means of a holding screw 36 extending through a supporting plate 37.

The motor 30 is connected to a pulley 33 by means of a belt 39 and rotates the worm 31. This worm rotates the worm gear 32 which in turn is rotated by the balls 34-34, which fit into recesses 40-40 in the disk 33. The said balls are forced into said recesses by means of a suitable spring 41 which urges a retaining member 42 against said balls through the hub 43 of a rocker lever 44 that is slidable upon the shaft 14. A braking disk 45 is provided between the

disks

33 and 35 and a spring 46 presses against the said disk 35 to force the braking disk 45 against the disk 33 and thereby provide a braking action tending to stop rotation of the shaft 14 immediately upon the release of the balls 34-34 by the member 42, as will be further described.

A paper measuring disk 47 is rotatable upon a sleeve 48 which is mounted on and extends through an eccentric bushing 49 in the wall'24. A driven gear 50 is rotatable on the said sleeve and meshes with a driving gear 51 which is carried by a measuring wheel 52 that is rotatable on the shaft 14 and disposed adjacent to the feed roll 13.

The gear 50 is engaged by a friction disk 52 provided between the said gear and a clutch disk 53 which is secured to a slide shaft 54- that extends through the sleeve 43. A torsion spring 55 has one end secured to the said clutch disk and its opposite end is anchored to a suitable bracket 56 that is mounted on the Wall-24.

The said slide shaft 54 is in engagement with-a spring bar 57 that is adapted to operate a suitable electric switch, indicated at 58, and also to apply tension against the disk 53, through the said shaft 54, for retaining frictional engagement between the gear 50 and the said shaft.

The rocker lever 44 has mounted thereon a plurality of inwardly projecting posts which include a post 59 for retaining the balls 34-34 in clutching position within the recesses 40-40, and an operating post 60 that is engaged by an operating finger 61 for rocking the lever 44 against the tension of a spring 62 that urges said bar for counter-clockwise rotation, as viewed in Fig. 7, and a stop post 63 is provided on the rocker bar for engaging the edge of the disk 47 to limit the rotation of said rocker bar and retain it in normal position.

The paper measuring disk 47 is adjusted by means of an adjusting knob 64 which may he graduated to cooperate with a pointer 65, for indicating the adjustments of the measuring disk for different lengths of photographic paper strip, and the said knob is mounted upon a shaft 66 that is rotatable in and extends through the walls 23 and 24 and has a pinion 67 which meshes with an intermediate gear 68 that meshes with a pinion 69 on the said measuring disk. A friction plunger is spring pressed against the knob 62 to retain it in adjusted position.

The photographic paper is moved, from between the feed rolls 13 and 19, over an easel which includes a table 71 having a pair of opposed guides 72-52 thereon that are adjustable to accommodate photographic strips of different lengths and to position the said paper to expose a portion of it in a printing Zone on said table that is directly in alignment with the lens of the projector. As shown in Figs. 9 to 13, the said guides 7272 are slidable upon the table '71 and have end portions 7373 which extend over and under the opposite edges of the table and are connected to endless chains 74-74 that extend over sprockets 7575 and retain the said guides parallel to each other when adjusted for photographic paper strips of different widths. The said guides are retained in adjusted position upon the table 71 by means of a retaining bar 76 that is mounted under the said table and is urged upwardly by a spring 77 into frictional engagement with a shoe 78 that is secured to one of the said guides by means of a stud 79' that extends through an elongated slot 80 in the said table.

In order to provide for varying the size of the printing zone, or the size of the exposure area on the said table 71 to accommodate photographs of different sizes, I provide an adjustable masking device which includes a shield 31 having an accordion type folding portion 82 that is secured at one end to an anchoring bar 83 and at its leading end to a masking bar 84. The said anchoring and masking bars are mounted upon a supporting shaft 85 that is secured to the bar 83 and is rotatable in posts 8686 that extend vertically from the table 71. The masking bar 84 is slidably adjustable on the supporting bar in adjusted position by means of a plunger 87 which extends through a mounting block 88 for the said masking bar and is retained in engagement with the shaft 85 by a spring 89. The forward ends of the said bars 83 and 84 and the accordion type folding portions 82 are slidably connected by means of a connecting bar 90 which is secured to the bar 83 and slidably extends through a series of notches in the folds of the portion 82 and through a post 91 upon the bar 81. V

The photographic paper strip is moved by thefeed roll through a cutting device which is located adjacent to and following the printing zone and includes a movable cutting blade 92 that is rotatably mounted between upright portions 93-93 of the side walls 23 and 24 and is biased in a counter-clockwise direction, as viewed in Fig. 2, by means of a spring 94 that is connected to a crank 95 which is secured to the cutting blade. The said cutting device is operated by means of a solenoid 96 that is connected to the crank 95 by a link 97 for rotating the cutting blade. A stationary cutting blade 98 is mounted upon the upright portions 93-93 and positioned to cooperate with the movable blade 92 for severing the paper upon the operation of the cutting device.

The unexposed roll 8 of the photographic paper is wound upon a core 99 and is supported in the machine on a mandrel which includes a pair of opposed end plugs 100 and 101 that fit into the ends of the core 99. The said plugs are axially adjustable upon the supporting shaft 102 and each includes a shell 103 which fits in the end of the core 99 and has thereon a block 104. A locking plate 105 is slidably secured to said block and has a key aperture 106 therein through which the supporting shaft extends. The said shaft has a plurality of annular grooves 106 adjacent its opposite ends and the plugs 100 and 101 may be adjustably secured along said shaft to accommodate rolls of different widths by means of said locking plates which are urged to engage with said grooves 107 by a suitable spring 108.

The exposed roll 10 of the strip is wound upon a mandrel 109 which is secured to a shaft 110 by means of a nut 111 that is threaded thereto for securing the said mandrel.

The'ends of the shaft extend into

notches

112 and 113 and a driven roller 114 is provided at one end of said shaft rests upon a driving roller 115 which is mounted on a driving shaft 116 having a sprocket thereon that is driven by a chain 117 which in turn is driven by a sprocket 118 on the shaft 14.

The electrical instrumentation and circuit shown in Fig. 17 are contained within the compartment 119. This includes an electric timing circuit, indicated at 120 in Fig. 17, for timing the projection of the film through the lens 5 of the projector.

In the use of the said machine, the photographic negative which is to be used for producing the required prints is first placed in the enlarger and the lens 5 is adjusted so as to project the negative upon the printing zone in proper focus. The mask 81 is then adjusted for the size of the photographic paper strip which is to be exposed to the projector and the paper measurement knob is adjusted for the length of paper which is to be fed through the machine by the

rolls

13 and 19. The projector is normally connected to the electrical circuit which controls the operation of the machine so that the said circuit also controls the operation of the projector in synchronism with said machine,

The duration of the exposure may be adjusted in accordance with the quality of the film by adjusting the selectors 121 of the timing circuit and the machine is then ready for operation.

The operation of the machine may be started by simply pressing the starter switch 122. This will cause energization of the projector which will then project the negative upon the portion ofthe strip that is exposed in the printing zone.

' At the expiration of the exposure period, the projector will be de-energized and the motor 30 will be energized. The worm gear 32 will then be rotated to cause rotation of the drive roll' 13 and movement of the photographic strip through the machine. The measuring roll 52 will then be driven by its contact with the moving photographic strip and this will cause rotation of the gear 50 which will rotate the shaft 54, through the friction disks 52 and 53, and thereby rotate the finger 61 in a counterclcckwisedirection from its normal position against the stop I23'untilit' engages the post 60. The said finger will then rotate the lever 44 in a clockwise direction until 5 the pin 63 will move off the edge of the disk 47, whereupon the torque between the worm wheel 32 and the clutch disk 33 will force the balls 3434 out of their respective recesses 4040 against the tension of the spring 41. This will cause the lever 44 to move the shaft 54 endwise and thereby operate the switch 58 and cause de-energization of the motor; whereupon the friction disk 45 will instantly stop the rotation of the feed roll 13. It will be understood, therefore, that the length of the photographic strip which is fed through the machine for each cycle of operation is determined by the adjustment of the disk 44, which adjustment is made by rotation of the knob 64. This adjustment determines the distance through which the finger 61 must travel from its normal position against the stop 123, to its operating position wherein it contacts the stud 60 and moves the stud 63 OK the edge of the disk 61.

The rotation of the disk 47 by the adjusting knob 64 will move the stop 123 nearer to, or farther from the stud 60 and this will determine the distance through which the finger 61 has to be rotated and, consequently, the length of printing paper which must be fed by the feed roll in order to cause rotation of the measuring roll 52 for moving the said finger the predetermined distance; thereby controlling the length of the printing paper which is fed through the machine for each printing operation.

The automatic operation of my improved photo printing machine will be further understood from the diagrammatical illustration of the electrical circuit shown in Fig. 17 of the drawings and from the following description of the sequential mode of operation.

(1) When the starter switch 122 is pressed, the grid capacitor C-1 will be discharged.

(2) Discharge of -1 will block this section of the 12AU6 dual triode and this will remove A.C. from grid of second section of said triode, removing self-rectification and causing conduction of current.

(3) Conduction of said triode section energizes the 10KLM11 relay.

(4) Energization of 10KLM11 relay closes the power circuit and removes latching voltage to grid of counter cathode.

(5) Power circuit. supplies B+ voltage to timer relay and also energizes KL17A relay.

(6) KL17A relay will then discharge capacitor C-2 into C-l by switching set of contacts A. Set of contacts B then switches capacitor (3-3 which has been charged by B]- circuit to cathode return of the SOBS timer tube. This applies a negative voltage to grid of said 50B5 tube causing it to block. Section C of relay KL17A then bridges the cam switch 58 in the motor circuit and the section D will latch relay KL17A, causing it to stay energized until latching voltage is interrupted.

(7) Blocking of timer tube SOBS de-energizes relay LM5-2500, opening motor circuit and closing circuit to the enlarger S-a.

(8) When charge of capacitor C-3 delays across resistor divider network, R1 and R-2, the 50135 timer tube conducts and energizes relay LM5-2500.

(9) When relay LM5-2500 is energized, it opens enlarger circuit and closes motor circuit.

(10) Motor now runs and moves cam switch 58 to run position.

(11) With cam switch in run position, relay KL17A is de-energized.

(12) With KL17A de-energized, A section again charges 0-2, B section causes 0-3 to charge, C section opens bridging circuit to motor and D section opens latching circuit to KL17A.

(13) When cam switch 58 is moved to stop position by the motor 30, either cutter solenoid 96 or relay KL17A is energized, depending on position of cutter selector switches at 124.

(14) If cutter switches are in position for cutting individual prints, the cutter is energized, moving microswitch 125 which is coupled to the cutter.

(15) When the cutter microswitch throws, it energizes KL17A, causing above sequence to repeat. C-l capacitor of electronic counter is charged in steps by capacitor C-2. When this charge reaches a certain magnitude, this section of the 12AU6 tube conducts, depending upon the bias setting of the cathode by the divider network which is controlled from the front of the panel. Each position for the adjustment of this network represents a count of one and is equal to the amount 0-1 -is charged for each cycle of operation of the machine for producing one photographic print.

It Will be understood from the above description that the selector circuit of my automatic printing machine may be adjusted to repeat the printing operation for any desired number of prints within the capacity of said selector circuit. Also, the selector switches 124 of the cutter circuit may be adjusted for cutting 01]. the exposed prints either singly or in any desired number as the strip is fed through the cutter mechanism.

When desired, the selector switches may be adjusted so that the switch 126 may be used for the manual control of the cutter.

I claim:

1. A photographic printing machine as set forth in claim 11 including an electric circuit, an electric switch in said circuit for controlling the energzaton of the motor, and means operable upon disengagement of the clutch for operating said switch to cause de-energization of the motor.

2. The subject matter set forth in claim 11 including an electric circuit, an electric switch in said circuit for controlling energization of the motor, and means under the control of the measuring roll for causing operation of the said switch to de-energize the motor simultaneously with the disengagement of the clutch.

3. An automatic photographic printing machine including means for supporting a strip of unexposed photographic paper, an exposure table, guide means on said table for guiding the strip and retaining a portion thereof in exposed position, a feed roll, a pressure roll for pressing the strip into contact with the feed roll to cause the strip to be moved across the exposure table, and means for measuring said strip as it is' moved by the feed roll; the said measuring means including a separate measuring roll adjacent to the feed roll and cooperating with the pressure roll whereby the said measuring roll is rotated by contact with the photographic strip independently of the feed roll as said strip is moved by the feed roll, means for driving the feed roll, a clutch between said driving means and feed roll, an operating finger for disengaging said clutch, a stop for engagement by said finger to determine its starting position, means for causing rotation of the finger by the measuring roll for disengaging the clutch, and means for adjusting the said stop to vary the distance between the starting position of the finger and its clutch disengaging position to thereby vary the length of the strip which is fed by the feed roll during the movement of said finger.

4. An automatic photographic printing machine including means for supporting a strip of unexposed photographic paper, an exposure table, a feed roll, a pressure roll for pressing the strip into contact with the feed roll to cause the strip to be moved across the exposure table, a drive shaft for said feed roll, a measuring roll rotatable on said drive shaft and located adjacent to the feed roll and adapted to be rotated by the strip independently of the feed roll as said strip is fed through the machine, an electric circuit, an electric motor in said circuit for driving said feed roll, a clutch between said motor and feed roll, an electric switch for controlling energization of the motor, a pinion rotated by said measuring roll, a clutch operating finger, a measuring disk, a stop on said disk for locating said finger in its starting position, a gear driven by said pinion for rotating said finger from its for rotating said measuring disk to adjust the position of said stop for varying the distance travelled by the clutch operating finger to cause disengagement of the clutch, and means operable upon the disengagement of the clutch for operating the switch to cause de-energization of the motor. 5. An automatic printing machine including means for supporting a roll of unexposed photographic paper strip, an exposure table, a feed roll for feeding the strip across said table, a motor for driving said feed roll, a clutch between said motor and feed roll, a measuring mechanismindependent of the feed roll for measuring portions of said strip as it is fed to the exposure table, a cutting mechanism for cutting off exposed portions of said strip, means under the control of said mechanism for causing operation of said clutch to disengage the feed roll from the motor when the exposed portion of the strip has been moved into the cutting mechanism, and means operable by the disengagement of the clutch to cause operation of the cutting mechanism for cutting oir" the exposed portion of the strip.

6. An automatic printing machine as set forth in claim including means operable by the operation of the cutting mechanism for causing operation of said machine for a successive cycle of operation.

7. In an automatic. printing machine for use with a photographic projector, means for supporting a strip of photographic printing paper, an exposure table on which a portion of said strip is exposed to the projector, a feed roll for intermittently moving portions of said strip over said table, an electric circuit having a motor therein for driving said feed roll, a clutch between the motor and the feed roll, a switch in said circuit for controlling energization of the motor, a cutting mechanism for cutting off exposed portions of said strip, a measuring mechanism including a measuring roll in contact with the said strip and rotated solely thereby upon the movement of the strip by the feed roll, means under the control of said measuring roll for causing disengagement of the clutch when a predetermined length of said strip has been moved by the feed roll, adjusting means for varying the operation of said measuring mechanism to vary the length of strip moved by the feed roll during each cycle of operation of the machine, a cutting mechanism, a solenoid in said circuit for controlling the operation of said cutting mechanism, means under the control of the measuring mechanism for causing de-energization of the motor when the clutch is disengaged, and means for operating said cutter mechanism to cut oif an exposed portion of the strip upon the clutch being disengaged.

8. In an automatic printing machine of the character described, the combination of means for supporting a strip of photographic paper in exposed position relatively to a photographic projector, a feed roll for moving said strip across said position, a measuring mechanism independent of the feed roll for measuring the said strip as it is moved by the feed roll, a cutting mechanism for cutting off exposed portions of said strip, an electric circuit, a motor for driving said feed roll, a switch in said circuit for controlling energization of the projector, a separate switch for controlling energization of the motor, means for causing energization of the projector for a predetermined period of time, means operable upon the expiration of said period of time to cause energization of the motor and operation of the feed roll for moving the said strip, means under the control of the measuring mechanism for disengaging the feed roll from the motor after a predetermined length of the strip has been moved by the feed roll, a cutting mechanism including a cutter for cutting otf exposed portions of the strip, means automatically operable upon disengagement of the feed roll from the motor for operating said cutting mechanism and selectively adjustable means in said circuit for causing operation of the cutter for cutting off portions of said strip with a selected number of exposures thereon.

9. The subject matter set forth in claim 8 including an electric switch operable by the operation of the cutting mechanism, and means under the control of said switch for causing operation of said machine for a successive cycle of operation.

10. An automatic printing machine including means for supporting a strip of paper, a feed roll for feeding said strip in said machine, a motor for driving the feed roll, an electric circuit, a switch in said circuit for controlling the motor, a pressure roll for pressing the strip into contact with the feed roll, and means for measuring the said strip as it is moved by the feed roll; the said measuring means including a measuring roll rotatable by frictional engagement with said strip independently of the feed roll, a measuring mechanism controlled by said measuring roll and operable for operating said switch to de-energize the motor upon the measuring roll having been rotated by a predetermined length of said strip, and means for adjusting the said measuring mechanism to render it operable to operate the switch upon the measuring roll having been rotated by different lengths of said strip.

'11. An automatic printing machine for use with a photographic projector, the said machine including means for supporting a strip of unexposed photographic paper, a feed roll, a motor for driving said feed roll, a pressure roll for pressing the strip into contact with the feed roll to cause the strip to be moved thereby, and means for controlling the length of said stripwhich is moved by the feed roll for each printing operation of the machine; the said controlling means including a separate measuring roll located adjacent to the feed roll and rotatable only by frictional engagement with the said strip independently of the feed roll, a clutch between said motor and the feed roll, and means controlled by the measuring roll for releasing the said clutch upon the measuring roll having been rotated for a predetermined distance by its contact with thephotographic strip as it is moved through the machine by the feed roll.

12. An automatic printing machine including means for supporting a strip of paper, a feed roll for feeding said strip in said machine, a motor for driving the feed roll, an electric circuit, a switch in said circuit for controlling the operation of the feed roll, and means for measuring the said stripas it is moved by the feed roll; the said measuring means including a separate measuring roll rotatable only by engagement with said strip independently of the feed roll, a measuring mechanism controlled by said measuring roll and operable for operating said switch to terminate the operation of the feed roll upon the measuring roll having been rotated by a predetermined length of said strip, and means for adjusting the said measuring mechanism to render it operable to operate the switch upon the measuring roll having been rotated by different lengths of said strip.

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