{
  "abstract": "A sheet postprocessing apparatus includes a postprocessing device that performs postprocessing on a sheet, and a drive unit having a motor for transporting the sheet. The postprocessing device includes an optional unit mounting base. On the optional unit mounting base, one of a folding unit having a function to fold the sheet, and a basic unit without the folding function can be selectively mounted. When the folding unit is mounted on the optional unit mounting base, a bidirectional motor capable of rotating forward and reversely is additionally provided in the drive unit, in addition to a forward rotation motor capable of rotating forward, which is permanently provided.",
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  "published_at": "2026-09-15T19:02:39.864475Z",
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  "source_date": "2026-04-21",
  "source_id": "US-12606408-B2",
  "source_name": "the United States Patent and Trademark Office",
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  "supersedes": null,
  "title": "Sheet postprocessing apparatus to which optional unit can be removably attached",
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