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CONTINUOUS  LOOP  PRINTING  SYSTEM

MODEL CPS-800

 

                               

TFS drawing B173-0001 shows a foot print of the entire system.

 

WHAT IS THE CPS-800?

The Technical Film Systems Inc. (TFS) model CPS-800 is a 35 mm motion picture loop printer for printing release prints.  The raw stock is fed and spliced continuously without stopping the negative loops.  The consequence of the continuous feed is that there are no raw stock short ends.  The printing is unidirectional as opposed to bi-directional; this results in the highest steadiness release prints in the industry.  The printing speed is 800 feet per minute (14,600 meters per hour).  The CPS-800 is run by a single operator.  (Equivalent production can be obtained with three modular printers.)

HOW DOES IT VARY FROM THE 2500 FEET PER MINUTE CPS?

The CPS-800 is a slower speed machine which results in a smaller foot print and lower ceiling height (11 feet, 3.35 meters) and a substantially lower cost than the 2,500 feet per minute CPS.  The CPS-800 is a simpler design.

SYSTEM DESCRIPTION

Both the picture and sound-track elevators are capable of holding up to 2,200 feet (670 meters) of negative; the minimum footage of each elevator is 400 feet (122 meters).  Please see photograph above of a section of an elevator

The change station (see above picture) is used for semi-automatically exchanging the negatives.  At the end of a production run the loop splice (a tape splice) of both negatives stops at the splicing block of the change station.  At this time the tape is removed from the loop splice and tail end of the negatives are spliced to the rolls to be loaded into the elevators; the head end of the negative in the elevators is attached to the take-up spindles.  When the load button is activated, both negatives load automatically at 800 feet per minute, the elevators automatically adjust to the proper height. At the end of the load cycle the head and tail end of the new negatives stop at the splicing block and are ready for the loop splice.  This entire process takes approximately six minutes; this compares favorably with the time required for exchanging the negatives on a modular printer.

The raw stock feed station  (see above  picture) is capable of feeding any length roll up to 8000 feet.  At the beginning of a production run, after the negatives have been loaded, the feed station will feed leader and automatically stop the leader at the proper point for splicing raw stock such that the raw stock splice coincides with the negative splices.  The result of this is that there is no raw stock loss.  The reverse is true at the end of a print run.  The raw stock splices are typically made with an ultrasonic splicer.  For ease of operation, the feed spindles are operated pneumatically.

The raw stock take-up station (see above picture) similar to the feed station and printer has a touch screen display which allows the operator to enter the number of copies to be taken up on one roll.  The maximum take-up capacity is 8,000 feet.  Thus it is possible to take up three, two thousand foot rolls but the machine is also capable of taking up single 2,000 foot rolls.  Similar to the feed station, the spindles are operated pneumatically.  an auto-lift mechanism is included with the take-up station.

As shown in the above picture, the printer is a highly modified model C printer.  The picture printing head has a dual printing sprocket which together with other novel design changes produces the extremely high picture steadiness.  The printer includes the standard TFS model LVC-6A Light Valve Controller and three Michelson Engineering Inc. model LV-4 Light Valves.  The LVC-6A accommodates either a one inch paper tape, a 3.5 inch floppy disc or an electronic interface for loading the Frame Count Cue (FCC) information. Included with the printer are three model FC-5 film cleaners for cleaning both negatives and the raw stock before it enters the printing apertures.  A fourth model FC-5 cleaner is located on the raw stock feed station.  The sound head is the standard TFS four channel sound track head capable of printing all four sound tracks. 

The printer includes the standard TFS pattern synchronization detectors  (PSDs).  Through a two frame checkerboard pattern printed into the negative the LVC6-A automatically synchronizes the picture negative to the (FCC) information.  Additionally the PSDs check the synchronization of the picture negative to the sound track negative each revolution of the negative loops.

ADVANTAGES OF THE CPS-800

1.         The most significant advantage of the CPS-800 is the high picture quality.

2.         The continuous feed nature of the printing system reduces raw stock short end losses by at least four percent to on the average of seven percent.

3.         Operating labor cost of the CPS-800 is about one third the labor cost of modular printers. 

4.         The operation of the CPS-800 is simpler than the operation of the CPS.

5.         With the four model FC-5 film cleaners, the system produces extremely clean prints and typically, as on the large CPS system, 2,000 prints before the negative requires cleaning.

6.         Inspection costs are reduced.  If print number 1 and 20 are satisfactory, all prints in between will generally be satisfactory.

7.         Almost all spare parts for the CPS-800 are identical to those of the CPS and thus are, with very few exceptions, in stock at TFS.

8.         Because of its low speed the CPS-800 is relatively quiet.

HISTORY OF THE LOOP PRINTING MACHINES

Technical Film Systems Inc. has been building loop printer for over 26 years.  For approximately 10 years before that time, the same engineering team now at TFS was building loop printing machines which had printing speeds of 3000 feet per minute (55,000 meters per hour) .

The TFS CPSs have been sold in the USA, Canada, Japan, England and Spain.


4725 Calle Quetzal
Camarillo, CA 93012-9101
tel: 805-384-9470
fax: 805-384-9471
email: techfilm@techfilmsystems.com