Electricity: motive power systems – Motor-reversing – Periodic- or intermittent-reversing
Patent
1991-12-19
1994-10-11
Shoop, Jr., William M.
Electricity: motive power systems
Motor-reversing
Periodic- or intermittent-reversing
318254, 318561, 36446402, H02P 100
Patent
active
053550684
ABSTRACT:
A mailing machine base adapted to have a postage meter mounted thereon, wherein the meter has a postage printing drum and a drive gear therefor, and wherein the meter has a shutter bar movable in opposite directions through a predetermined distance for movement thereof out of and into locking engagement with the drive gear, the base comprising, structure for moving the shutter bar, a d.c. motor for driving the shutter bar moving structure, a microprocessor, including a program power switching structure connected between the microprocessor and d.c. motor, the switching structure including four power switches arranged in an H-bridge circuit configuration for driving the motor in opposite directions respectively corresponding to the opposite directions of movement of the shutter bar, and the microprocessor program including means for: (i) energizing the switching structure with a first signal for driving the d.c. motor in a given direction for a first time interval predetermined to cause the d.c. motor to move the shutter partially through the predetermined distance, (ii) energizing the switching structure with a second signal for driving the d.c. motor in the given direction for a second time interval predetermined to cause the d.c. motor to move the shutter bar substantially through the remainder of the predetermined distance, (iii) energizing the switching structure with a third signal for driving the d.c. motor in the direction opposite to the given direction for a time interval predetermined to cause the d.c. motor to decelerate movement of the shutter bar, and (iv) energizing the switching structure with a fourth signal for driving the d.c. motor in the given direction for a fourth time interval predetermined to move the shutter entirely through the remainder of the distance.
REFERENCES:
patent: 4774446 (1988-09-01), Salazar et al.
patent: 4835449 (1989-05-01), Huehn
patent: 4864505 (1989-09-01), Miller et al.
patent: 4988931 (1991-01-01), Tsukahara et al.
Eckert, Jr. Alton B.
Gallagher Dennis M.
Pfeifer Thomas M.
Schoonmaker Richard P.
Masih Karen
Pitney Bowes Inc.
Scolnick Melvin J.
Shoop Jr. William M.
Walker Donald
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