This patent issued on a continued prosecution application filed under 37 CFR 1.53(d), and is subject to the twenty year patent term provisions ol 35 U.S.C. 154(a)(2).
 Appl. No.: 08/604,546
 Filed: Feb. 21, 1996
 Foreign Application Priority Data
Feb. 21, 1995 [JP] Japan 7-032732
Feb. 21, 1995 [JP] Japan 7-032733
 Int. CI.6 B41J 2/165
 U.S. CI 347/23; 347/86
 Field of Search 347/23, 86, 87
0374762 0 442 438 0 443 245 0 556 011 0 574 182
6/1990 8/1991 8/1991 8/1993 12/1993
European Pat. Off. European Pat. Off. European Pat. Off. European Pat. Off. European Pat. Off.
(List continued on next page.)
Abstract ol Japanese Laid-Open Patent Application No. 04-250064, Jan. 1991.
Primary Examiner—Matthew Nguyen
Attorney, Agent, or Firm—Fitzpatrick, Cella, Harper &
An ink jet printing apparatus capable ol exchangeably mounting a plurality ol kinds ol recording devices provided with discharging devices for discharging ink. The apparatus includes a recovery operation device for effecting a recovery operation for recovering a discharge condition ol a recording head to be mounted to the apparatus, a timer for clocking an elapsed time from a predetermined operation, a discriminating device lor discriminating a recording device to be mounted, a memory lor memorizing data recording an elapsed time from a previous recovery operation for each ol the plurality ol kinds ol recording devices, a calculating device lor calculating an elapsed time ol the recording device to be mounted from a previous recovery operation, based on an elapsed time clocked by the timer and data stored in the memory, a switch lor switching between an operation state and a non-operation state ol the apparatus, a back-up device for backing up the timer and the memory, even when the apparatus is not in operation, the back-up device also backing up the timer and the memory lor a recording device, ol the plurality ol kinds ol recording devices, not mounted to the apparatus, and a recovery control device for controlling the recovery operation by the recovery operation device by comparing the elapsed time from the previous recovery operation with a predetermined relerence time for the recording device to be mounted.