Printing mechanism and thermal printer

Patent metadata

Field	Value
Publication number	US-9751340-B2
Application number	US-201615354362-A
Country	US
Kind code	B2
Filing date	Nov 17, 2016
Priority date	Nov 20, 2015
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

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.

First claim

What is claimed is:

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.

2. 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.

3. 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.

4. 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.

5. A thermal printer, comprising:
the printing mechanism of claim 4 ; and
a casing to which the printing mechanism is mounted.

6. A thermal printer according to claim 5 , wherein
the another mechanism is arranged below the one mechanism.

7. 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.

8. 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.

9. A thermal printer, comprising:
the printing mechanism of claim 1 ; and
a casing to which the printing mechanism is mounted.

10. A thermal printer according to claim 9 , wherein
the another mechanism is arranged below the one mechanism.

Assignees

• Seiko Instr Inc

Inventors

• Hoshino Minoru

Classifications

• B26D1/025 Primary

  for thin material, e.g. for sheets, strips or the like · CPC title

• B41J2/32

  using thermal heads · CPC title

• B41J11/70

  cutting perpendicular to the direction of paper feed · CPC title

• B41J11/04 Primary

  Roller platens · CPC title

• B41J11/0045

  Guides for printing material (curl smoothing B41J11/0005; platens B41J11/02, B41J11/06; guiding webs B41J15/046) · CPC title