Card reading apparatus having a passive electrical speed controller

• US 4,914,279 A
• Filed: 01/19/1989
• Issued: 04/03/1990
• Est. Priority Date: 12/05/1985
• Status: Expired due to Fees

• Current Assignee: Unisys Corporation
• Original Assignee: Unisys Corporation
• Inventors: Massey, James C. R.
• Primary Examiner(s): Canney, Vincent P.
• Assistant Examiner(s): Weinhardt, Robert A.
• Application Number:
  US07/300,689
• Time in Patent Office: 439 Days
• Field of Search: 235/482, 235/449, 235/436, 235/454, 235/475, 235/476, 235/477, 235/479, 235/480, 360/2
• US Class Current: 235/449
• CPC Class Codes: G06K 13/08 Feeding or discharging cards
• CPC Class Codes: G06K 7/084 sensing magnetic material by relative movement detecting flux changes without altering its magnetised state
• CPC Class Codes: G06K 7/14 using light without selection of wavelength, e.g. sensing reflected white light G06K7/10831 - G06K7/1097 take precedence

Abstract

Disclosed is an apparatus for reading information stored on a card. The card is introduced through a slot in the fascia and moved along an adjacent guide path by the user. A slider, coupled to the guide path, interrupts the leading edge of the card as the card is moved into the slot and along the guide path. One or more springs, coupled between the slider and a fixed position, store elastic energy as the card is moved into the apparatus and along the guide path. Upon the user releasing the card, the stored elastic energy is applied to the slider to move the card back along the guide path and expel the card through the slot. A speed controlled comprised of a passive D.C. generator/diode under configuration, coupled between the slider and the guide path, maintains the velocity of the card constant as the card moves in either or both directions along the guide path, thereby allowing a fixed position optical or magnetic transducer to read the stored information from the card.

Claims

1. A card reading apparatus comprising:

guide means for guiding movement of a card along a path;

transducer means for detecting information recorded on said card as said card is moved along said path;

energy store means for elastically storing energy as said card is inserted into said guide means and moved along said path by an insertion force, said energy store means further for moving said card along said path towards expulsion from said guide means in response to removal of said insertion force; and

controller means for controlling the rate of movement of said card along said path;

said controller means comprising a D.C. electrical generator operative to produce across its output terminals and electromotive force proportional in sense and magnitude to the direction and velocity respectively of said card;

said generator having an electrical load including at least one unidirectional current conducting device connected across said output terminals, said unidirectional current conducting device being driven to a conducting state when the produced electromotive force reaches a predetermined magnitude.

2. An apparatus as defined in claim 1 wherein said electrical load comprises a first diode, said first diode being poled to conduct when said card achieves sufficient velocity in a preferred direction to overcome the turn-on voltage of said first diode.

3. An apparatus as defined in claim 2 further including a first zener diode connected in series with said first diode, said first zener diode being wired to oppose conduction in said first diode, and said first zener diode having a regulation voltage selected to effect a desired velocity of said card in said preferred direction.

4. An apparatus as defined in claim 2 wherein said electrical load comprises a second diode, said second diode being poled to conduct when said card achieves sufficient velocity in a second direction, opposite to said preferred direction, to overcome the turn-on voltage of said second diode.

5. An apparatus as defined in claim 4 further including a second zener diode in series with said second diode, said second zener diode being wired to oppose conduction in said second diode, and said second zener diode having a regulation voltage selected to effect a desired velocity of said card in said second direction.

6. An apparatus as defined in claim 3 wherein said electrical load includes a second diode, said second diode being poled to conduct when said card achieves sufficient velocity in a second direction, opposite to said preferred direction, to overcome the turn-on voltage of said second diode.

7. An apparatus as defined in claim 6 further including a second zener diode in series with said second diode, said second zener diode being wired to oppose conduction in said second diode, and said second zener diode having a regulation voltage selected to effect a desired velocity of said card in said second direction.

8. An apparatus as defined in claim 1 wherein said guide means includes a slider for engaging a leading edge of said card, said controller means being coupled to said slider, whereby the rate of movement of said slider along said path is controlled.

9. An apparatus as defined in claim 8 wherein said guide means includes guide slots for engaging and guiding the edges of said card, and wherein said slider is supported and guided by said guide slots.

10. An apparatus as defined in claim 9 wherein said controller means includes a controller and a shaft, said shaft coupling together said controller and said slider.

11. An apparatus as defined in claim 10 wherein said shaft is coupled to rotate an armature in said electrical generator.

12. An apparatus as defined in claim 11 further including an axle having a pair of opposite extremities, one of said extremities of said axle being coupled to said armature, a cog wheel affixed to the other extremity of said axle, said shaft having a linear progression of teeth formed thereon, said teeth engaging said cog wheel such that linear motion of said shaft in response to the movement of said card effects rotational movement of said axle and said armature.

13. An apparatus as defined in claim 1 wherein said energy stored means includes a spring mounted to be compressed as said card is inserted and moved along said path by said insertion force.

14. An apparatus as defined in claim 13 wherein said energy store means includes a spring coupled between said slider and said guide means.

15. An apparatus as defined in claim 14 wherein said guide means includes an entry slot permissive of introduction of said card therethrough, said entry slot being positioned adjacent to said guide means.

16. An apparatus as defined in claim 15 wherein said entry slot is provided in a fascia, said slot comprising a recess in said fascia adapted to permit insertion of said card into said entry slot with a trailing edge of said card beneath the surface of said fascia.