Printer and method of printing

• US 4,733,249 A
• Filed: 07/15/1987
• Issued: 03/22/1988
• Est. Priority Date: 07/17/1986
• Status: Expired due to Term

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Takei, Katusmori, Yamaguchi, Yoshitaka, Fukushima, Hitoshi, Iwamoto, Kohei
• Primary Examiner(s): Evans, Arthur G.
• Application Number:
  US07/073,549
• Time in Patent Office: 251 Days
• Field of Search: 346/74.2, 346/74.4, 346/105, 346/106, 101/DIG. 5, 400/119, 358/301
• US Class Current: 346/74.4
• CPC Class Codes: B41J 2/325 by selective transfer of ink from ink carrier, e.g. from ink ribbon or sheet
• CPC Class Codes: B41M 5/38285 characterised by magnetic components in the transfer ink

Abstract

A printer and method of printing on a transfer medium utilizing thermoplastic magnetic ink. A thermal head selectively applies thermal energy to melt selected portions of the thermoplastic magnetic ink. A magnetic head substantially spatially fixed relative to the thermal head applies the magnetic force to the thermoplastic ink which causes the melted portions to be ejected onto the transfer medium. A strip of thermoplastic magnetic ink medium is positioned to slide between the thermal head and the transfer medium. The strip includes a base layer facing the thermal head and a magnetic thermoplastic ink layer facing the transfer medium. A first movement mechanism moves either the transfer medium or the thermal and magnetic heads relative to the other at a first speed. A second movement mechanism moves the magnetic thermoplastic ink medium strip relative to the magnetic and thermal heads at a second speed. The first and second speeds are unequal. The method includes moving a thermoplastic magnetic ink medium at a first speed relative to a thermal head and moving a magnetic head and thermal head at a second speed not equal to the first speed relative to the transfer medium. Selected portions of the thermoplastic magnetic ink medium are melted with a thermal print head. The melted ink from the thermoplastic magnetic ink medium is transferred to the transfer medium by a magnetic force applied by a magnetic head.

Claims

1. A printer for printing on a transfer medium utilizing thermoplastic magnetic ink, comprising:

a thermal head for selectively applying thermal energy to melt selected portions of the thermoplastic magnetic ink;

a magnetic head substantially spatially fixed relative to the thermal head for applying a magnetic force to the thermoplastic ink which causes the melted portions to be transferred onto the transfer medium;

a strip of thermoplastic magnetic ink medium positioned for displacement in the space between the thermal head and transfer medium, the strip including a base layer facing and contacting the thermal head and a thermoplastic magnetic ink layer facing the transfer medium;

first movement means for moving one of the transfer medium and the thermal and magnetic heads relative to the other at a first speed; and

second movement means for moving the magnetic thermoplastic ink medium strip relative to the magnetic and thermal heads at a second speed, the first and second movement means being adapted to permit the first and second speeds to be unequal.

2. The printer of claim 1 wherein the first speed is greater than the second speed.

3. The printer of claim 1 wherein the second speed is greater than the first speed.

4. The printer of claim 1 wherein the thermal head includes drive circuit means for selectively heating sections of the thermal head to melt selected portions of the thermoplastic magnetic ink on the thermoplastic magnetic ink medium strip.

5. The printer of claim 4 wherein the drive circuit means includes at least one heat generating means for converting electrical energy to thermal energy, switch means for selectively applying electrical energy to the heat generating means and pulse generating means coupled to the switch means for selectively causing the switch means to apply electrical energy to the heat generating means.

6. The printer of claim 5 wherein the switch means includes a transistor having a switching terminal and the pulse generating means is coupled to the switching terminal.

7. The printer of claim 1 wherein the magnetic head is a permanent magnet.

8. The printer of claim 1 wherein the first movement means includes a motor for moving the thermal and magnetic heads relative to the transfer medium.

9. The printer of claim 8 wherein the thermal head is mounted on a carriage.

10. The printer of claim 9 wherein the carriage is coupled to a first belt, the magnetic head is coupled to a second belt and the first and second belts are synchronously driven by the first motor.

11. The printer of claim 1 wherein the second movement means includes a second motor for driving the ink medium strip.

12. The printer of claim 9 wherein the second movement means includes a second motor for driving the ink medium strip.

13. The printer of claim 12 wherein second motor and thermoplastic magnetic ink medium are supported on the carriage.

14. The printer of claim 9 wherein the second movement means and thermoplastic magnetic ink medium are supported on the carriage.

15. The printer of claim 1 further comprising drive control means coupled to the first and second movement means for varying the first and second speeds.

16. The printer of claim 15 wherein the drive control means includes pulse generating means for generating driving pulses and first and second divider means coupled to the pulse generating means for dividing the driving pulses to drive the first and second movement means at different speeds.

17. The printer of claim 16 wherein the first movement means includes a first motor, the second movement means includes a second motor and the first divider means drives the first motor and the second divider means drives the second motor.

18. The printer of claim 1 wherein the strip of thermoplastic magnetic ink medium is formed as a ribbon.

19. A method for printing on a transfer medium with thermoplastic magnetic ink, comprising:

moving a thermoplastic magnetic ink medium at a first speed relative to a thermal head and a magnetic head;

moving one of the magnetic head and the thermal head, and the transfer medium at a second speed, not equal to the first speed, relative to the other;

melting selected portions of the thermoplastic magnetic ink on a thermoplastic magnetic ink medium with the thermal head; and

transferring the melted ink from the thermoplastic magnetic ink medium to the transfer medium by magnetic force applied by a magnetic head.

20. The method of claim 19 wherein the first speed is greater than the second speed, whereby high quality printing is performed.

21. The method of claim 19 wherein the second speed is greater than the first speed whereby conservation of the thermoplastic magnetic ink medium is obtained.

22. The method of claim 19 wherein the melted ink is transferred to the transfer medium by applying a magnetic force.