Linear translation system for use in a laser imaging system

• US 6,064,416 A
• Filed: 09/29/1997
• Issued: 05/16/2000
• Est. Priority Date: 09/29/1997
• Status: Expired due to Fees

• Current Assignee: CareStream Health Incorporated
• Original Assignee: Eastman Kodak Company
• Inventors: Esch, Jay A., Vraa, Timothy S., Schubert, Paul C., Steffen, James E., Li, Yun Zhong
• Primary Examiner(s): Le, N.
• Assistant Examiner(s): PHAM, HAI CHI
• Application Number:
  US08/939,420
• Time in Patent Office: 960 Days
• Field of Search: 347/225, 347/262, 347/264, 347/104, 346/138, 358/474, 395/117, 400/11, 400/320, 400/336
• US Class Current: 347/225
• CPC Class Codes: F16C 29/02 Sliding-contact bearings
• CPC Class Codes: H04N 1/04 Scanning arrangements , i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versaH04N1/387 takes precedence
• CPC Class Codes: H04N 1/0607 Scanning a concave surface, e.g. with internal drum type scanners H04N1/0657 takes precedence
• CPC Class Codes: H04N 1/0685 using a belt or cable

Abstract

A linear translation system for use in a laser imaging system. The linear translation system includes a base member including a pair of longitudinally extending guide rails positioned parallel to each other. A carriage mechanism is carried by the base member, wherein the carriage mechanism is slidably coupled to the guide rails using a three position kinematic design. A rotary to linear motion mechanism is coupled to the carriage mechanism which slidably moves the carriage mechanism along the guide rails. A laser imaging assembly is coupled to the carriage mechanism.

Claims

1. A linear translation system for use in a laser imaging system, the linear translation system comprising:

a base member including a pair of longitudinally extending guide rails positioned parallel to each other;

a carriage mechanism carried by the base member, wherein the carriage mechanism is slidably coupled to the guide rails using a three position kinematic design;

a rotary to linear motion mechanism coupled to the carriage mechanism which slidably moves the carriage mechanism along the guide rails, wherein the rotary to linear motion mechanism includes a cable tensioning system; and

a laser imaging assembly coupled to the carriage mechanism.

2. The system of claim 1, wherein the three position kinematic design includes the carriage mechanism contacting the guide rails at five points.

3. The system of claim 1, wherein the carriage mechanism includes a carriage body having a v-shaped bearing surface.

4. The system of claim 1, wherein the carriage mechanism includes a carriage body having a first bearing surface, a second bearing surface, and a third bearing surface for contacting the guide rails.

5. The system of claim 4, wherein the first bearing surface, the second bearing surface, and the third bearing surface include a lubricous polymeric coating.

6. The system of claim 4, wherein the first bearing surface and the second bearing surface are v-shaped.

7. The system of claim 4, wherein the pair of guide rails include a first guide rail and a second guide rail, and wherein the first bearing surface and the second bearing surface contact the first guide rail, and wherein the third bearing surface contacts the second guide rail.

8. The system of claim 4, wherein the third bearing surface is flat and contacts one of said pair of guide rails at a single point.

9. The system of claim 1, wherein the rotary to linear motion mechanism comprises:

a motor having a rotating shaft;

a flywheel mechanism; and

a capstan coupled to said shaft and positioned between the shaft and the flywheel.

10. The system of claim 9, wherein the capstan is coupled to the shaft and tensioned against the flywheel mechanism.

11. The system of claim 10, further comprising a mechanism for tensioning the capstan against the flywheel mechanism.

12. The system of claim 9, wherein the base member further comprises a base bracket;

and the system further comprises a motor mount, wherein the motor is mechanically coupled to the motor mount and the motor mount is pivotally coupled to the base bracket.

13. The system of claim 12, further comprising an extension mechanism coupled between the motor mount and the base bracket which tensions the capstan against the flywheel.

14. The system of claim 13, further comprising a compression mechanism coupled between the motor and the motor mount.

15. The system of claim 9, wherein said capstan is mounted on said

shaft;

and

said capstan has a polymeric coating on at least a portion thereof.

16. The system of claim 9, the further comprising a drive pulley extending from the flywheel.

17. The system of claim 16, wherein the drive pulley is integral the flywheel.

18. The system of claim 16, further comprising a cable system mechanically coupled between the drive pulley and the carriage mechanism.

19. The system of claim 18, wherein the cable system includes a relatively stiff cable with a lubricious coating.

20. The system of claim 19, wherein the cable is made of steel, and the lubricious coating is polytetrafluoroethylene.

21. The system of claim 9, wherein the motor is a stepping motor.

22. The system of claim 9, wherein the laser imaging assembly scans a scan line across a scanned surface in a direction generally perpendicular to the movement of the carriage mechanism, and wherein the motor moves the carriage mechanism during each scan line.

23. The system of claim 22, wherein the motor is a stepping motor, and wherein the stepping motor moves the carriage mechanism a plurality of micro-steps during each scan line.

24. A laser imaging system having a linear translation system and a scanner assembly, wherein the linear translation system moves the scanner assembly across a scanned surface in a direction generally perpendicular to the scanning direction, the system comprising:

a base member including a pair of longitudinally extending guide rails positioned parallel to each other, the longitudinally extending guide rails defining a longitudinal axis therebetween;

a carriage mechanism carried by the base member, wherein the carriage mechanism slidably coupled to the guide rails using a kinematic design having five contact points; and

a rotary to linear motion mechanism coupled to the carriage mechanism which slidably moves the carriage mechanism along the guide rails;

wherein the laser imaging assembly is coupled to the carriage mechanism between the carriage mechanism and the scanned surface, and wherein the laser imaging assembly scans a scan line across the scanned surface in an image-wise pattern, wherein the scan line is generally perpendicular to the movement of the carriage mechanism.

25. The system of claim 24, wherein the carriage system includes a first bearing surface, a second bearing surface, and a third bearing surface for contacting the guide rails.

26. The system of claim 25, wherein the first bearing surface and the second bearing surface are v-shaped.

27. The system of claim 26, wherein the third bearing surface is flat, and wherein the pair of longitudinally extending guide rails includes a first guide rail and a second guide rail, and wherein the first bearing surface and the second bearing surface contact the first guide rail, and wherein the third bearing surface contacts the second guide rail.

28. The system of claim 24, wherein the rotary to linear motion mechanism comprises:

a motor assembly having a rotating shaft; and

a flywheel mechanism, wherein the rotating shaft drives the flywheel mechanism.

29. The system of claim 28, wherein the rotary to linear motion mechanism further comprises a capstan coupled to the rotating shaft, wherein the flywheel includes an outside edge, and wherein the capstan is tensioned against the flywheel outside edge.

30. The system of claim 29, wherein the capstan is cylindrically shaped and has a diameter less than the diameter of the flywheel.

31. The system of claim 29, wherein said capstan

is cylindrically shaped and has a polymeric coating located about at least a portion thereof.

32. The system of claim 29, wherein the base member further comprises a base bracket, and the system further comprises a motor mount, wherein the motor assembly is mechanically coupled to the motor mount and the motor mount is pivotally coupled to the base bracket.

33. The system of claim 32, further comprising an extension mechanism coupled between the motor mount and the base bracket which tensions the capstan against the flywheel.

34. The system of claim 33, further comprising a compression mechanism coupled between the motor and the motor mount.

35. The system of claim 28, further comprising a drive pulley mechanism extending from the flywheel.

36. The system of claim 35, wherein the drive pulley mechanism is formed integral the flywheel.

37. The system of claim 36, further comprising a cable system operably connecting the pulley and the carriage system.

38. An internal drum type scanner assembly for use in a laser imaging system, the scanner assembly comprising:

a frame having a first end, a second end, and an internal drum shaped scanning surface for positioning a piece of photosensitive film thereon;

a linear translation system positioned above the scanning surface coupled to the frame, the linear translation system comprising a base member including a pair of parallel guide rails extending longitudinally between the first end and the second end;

a carriage mechanism carried by the base member, wherein the carriage mechanism slidably coupled to the guide rails using a kinematic design having five contact points;

a rotary to linear motion mechanism coupled to the carriage mechanism which precisely moves the carriage mechanism along the guide rails; and

a laser imaging assembly, wherein the laser imaging assembly is coupled to the carriage mechanism between the carriage mechanism and the scanned surface, and wherein the laser imaging assembly scans a scan line across the photosensitive film in an image-wise pattern, wherein the scan line is generally perpendicular to the movement of the carriage mechanism.

39. The system of claim 38, further comprising wherein the pair of guide rails extend between a first base end bracket and a second base end bracket, and wherein the first base end bracket and the second base end bracket each have a pair support pins extending therefrom.

40. The system of claim 39, further comprising wherein the first end and the second end each include a pair of notches for slidable receipt of the support pins for supporting the linear translation system from the frame.