JAPAN—  Taiyo Pacific Partners is considering raising its $400 million tender offer for Japanese printer maker Roland DG Corp. to fight off an unsolicited bid from Brother Industries Ltd. Taiyo Pacific, Roland DG’s biggest shareholder with a 19.4% stake, is weighing that option against two others — accepting Nagoya-based Brother’s takeover bid  and abandoning the buyout when the tender offer expires later this month. Taiyo Pacific Co-Chief Executive Officer Brian Heywood said. Taiyo Pacific is offering ¥5,035 a share. Japan’s office equipment industry, which is crowded with the world’s biggest copier makers, is undergoing long-overdue consolidation as more customers go paperless. Fujifilm Business Innovation and Konica Minolta Inc. are in talks about teaming up, while Ricoh Co. and Toshiba TEC Corp. are merging their multifunction printer operations. But Roland DG, whose digital printers are used to print billboards, historic art replicas and fabric patterns, is charting its own path to protect its niche but high-tech capabilities.