# US 9,751,340 B2 · Printing mechanism and thermal printer > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,751,340 B2 - Document ID: US9751340B2 - Status: Granted - Kind: B2 - Application number: 15/354,362 - Filed: 2016-11-17 - Published: 2017-05-25 - Granted: 2017-09-05 - Earliest claimed: 2015-11-20 - Assignees: Seiko Instruments Inc. - Applicants: Seiko Instruments Inc. - Inventors: Minoru Hoshino - Web page: https://patentgrep.com/patent/US9751340B2 ## CPC - B41J 11/04: Roller platens - B26D 1/025: {for thin material, e.g. for sheets, strips or the like} - B26D 1/085: {for thin material, e.g. for sheets, strips or the like} - B41J 2/32: using thermal heads - B41J 11/0045: {Guides for printing material (curl smoothing B41J11/0005; platens B41J11/02, B41J11/06; guiding webs B41J15/046)} - B41J 11/006: {Means for preventing paper jams or for facilitating their removal} - B41J 11/70: cutting perpendicular to the direction of paper feed - B26D 2001/0066: {having shearing means, e.g. shearing blades, abutting blades} - B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS - B26D: CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING (for growing crops or plants A01D, A01G; for fodder or straw A01F; for bulk butter A01J; for dough A21C; slaughtering A22B; for tobacco, cigars or cigarettes A24; marking-out, perforating or making buttonholes A41H25/00; manufacturing footwear A43D; brushmaking A46D; surgery A61B; disintegrating, mincing or shredding in general B02C; cutting wire, making pins or nails B21F, B21G; of the kind used formetal B23; cutting by abrasive fluid jets B24C5/02; hand-held cutting tools B26B; perforating, cutting-out, stamping-out or punching, or severing by means other than cutting B26F; for wood B27; for stone B28D; working of plastics or substances in a plastic state B29; making boxes, cartons, envelopes or bags, of paper or similarly worked materials, e.g. metal foil, B31B; article or web delivery apparatus incorporating cutting or line-perforating devices B65H35/00; for leather or upholstery B68, C14B; for glass C03B; making matches C06F; for peat C10F; for sugar C13B45/00; for textile materials D06H; civil engineering, building, mining, see Section E; for light guides G02B6/25; cutting processed photographic material G03D15/04) ## Abstract A printing mechanism has: a head mechanism including a printing head configured to print on a recording paper; a platen mechanism including a platen roller configured to nip the recording paper with the printing head to feed the recording paper; a fixed blade arranged in one mechanism of the head mechanism and the platen mechanism; and a movable blade arranged in another mechanism of the head mechanism and the platen mechanism in a slidable manner and configured to cut the recording paper with the fixed blade, the another mechanism comprising: a movable blade guide wall arranged upstream of the movable blade in a paper path direction of the recording paper; a first rib protruding from the movable blade guide wall to downstream of the paper path direction; and a second rib formed at a position on the movable blade guide wall, which is separated from the fixed blade with respect to the first rib in a movement direction of the movable blade. ## Claims ### Claim 1 A printing mechanism, comprising: a head mechanism including a printing head configured to print on a recording paper; a platen mechanism including a platen roller configured to nip the recording paper with the printing head to feed the recording paper; a fixed blade arranged in one mechanism of the head mechanism and the platen mechanism; and a movable blade arranged in another mechanism of the head mechanism and the platen mechanism in a slidable manner and configured to cut the recording paper with the fixed blade, the another mechanism comprising: a movable blade guide wall arranged upstream of the movable blade in a paper path direction of the recording paper; a first rib protruding from the movable blade guide wall to downstream of the paper path direction; and a second rib formed at a position on the movable blade guide wall, which is separated from the fixed blade with respect to the first rib in a movement direction of the movable blade. ### Claim 2 (depends on 1) A printing mechanism according to claim 1, wherein the movable blade is slidable between a cutting position at which the recording paper is cut between the movable blade and the fixed blade, and a separation position at which the movable blade is separated from the fixed blade; and the second rib is formed at a position on the movable blade guide wall, which corresponds to a blade edge of the movable blade at the separation position. ### Claim 3 (depends on 2) A printing mechanism according to claim 2, wherein the another mechanism protrudes from the movable blade guide wall to downstream in the paper path direction, and includes a third rib for connecting the first rib and the second rib to each other. ### Claim 4 (depends on 3) A printing mechanism according to claim 3, wherein a clearance between the second rib and the movable blade in the paper path direction is set to be 0.5 mm or less. ### Claim 5 (depends on 4) A thermal printer, comprising: the printing mechanism of claim 4; and a casing to which the printing mechanism is mounted. ### Claim 6 (depends on 5) A thermal printer according to claim 5, wherein the another mechanism is arranged below the one mechanism. ### Claim 7 (depends on 1) A printing mechanism according to claim 1, wherein the another mechanism protrudes from the movable blade guide wall to downstream in the paper path direction, and includes a third rib for connecting the first rib and the second rib to each other. ### Claim 8 (depends on 1) A printing mechanism according to claim 1, wherein a clearance between the second rib and the movable blade in the paper path direction is set to be 0.5 mm or less. ### Claim 9 (depends on 1) A thermal printer, comprising: the printing mechanism of claim 1; and a casing to which the printing mechanism is mounted. ### Claim 10 (depends on 9) A thermal printer according to claim 9, wherein the another mechanism is arranged below the one mechanism.