You should update your printers firmware and reload both Mac and windows drivers for the same printer. I look at this as more of a driver problem. Firmware and drivers can be located here. If problem persists, try to approach this instance by using the elimination method. remove pc from network, test with only macs connected. then remove macs and test with only PC connected. then finnaly, install this printer directly to pc and test the performance and then directly on one of the macs and test.
Regards
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It is illogical that the drivers on all four computers would have the same problem simultaneously. It had to be one thing common to all four. Therefore it had to be either the Time Machine or the printer or the cabling between them.
I found that it was a bad USB port on the printer and all is working fine now.
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