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US 7,922,406 B2Granted
Image generating apparatus
AssigneeFunai Electric Co., Ltd.
InventorsKunio Sawai, Takahiro Naito
Life of this patent
Estimating the term…
Abstract
In this image generating apparatus, a driving gear portion is so formed that the diameter of the outer peripheral surface of a first toothless portion is smaller than the tip diameter of a first toothed portion, and so arranged that the first toothless portion thereof slides on a second toothed portion of a driven gear portion of a print head rotating member in the vicinity of a position where a print head presses a platen roller with a pressing portion.
Claims16
An image generating apparatus comprising:
- a print head for printing images while pressing a platen roller with prescribed pressing force;
- a driving gear portion including a first toothed portion provided in a prescribed rotation angle range and a first toothless portion provided on a region other than said first toothed portion;
- and
- a print head rotating member integrally including a driven gear portion having a second toothed portion provided in said prescribed rotation angle range and a second toothless portion provided on a region other than said second toothed portion for meshing with said driving gear portion and a pressing portion pressing said print head, wherein
- said driving gear portion is so formed that the diameter of the outer peripheral surface of said first toothless portion is smaller than the tip diameter of said first toothed portion, and
- said driving gear portion is so arranged that said first toothless portion of said driving gear portion slides on said second toothed portion of said driven gear portion of said print head rotating member in the vicinity of a position where said print head presses said platen roller with said pressing portion of said print head rotating member.
3 more elements
An image generating apparatus comprising:
- a print head for printing images while pressing a platen roller with prescribed pressing force;
- a driving gear portion including a first toothed portion provided in a prescribed rotation angle range and a first toothless portion provided on a region other than said first toothed portion;
- and
- a print head rotating member integrally including a driven gear portion having a second toothed portion provided in said prescribed rotation angle range and a second toothless portion provided on a region other than said second toothed portion for meshing with said driving gear portion and a pressing portion so arranged as to press a portion around the cross-directional center of said print head, wherein
- said driving gear portion is so formed that the diameter of the outer peripheral surface of said first toothless portion is smaller than the tip diameter of said first toothed portion,
- said driving gear portion is so arranged that said first toothless portion of said driving gear portion slides on said second toothed portion of said driven gear portion of said print head rotating member in the vicinity of a position where said print head presses said platen roller with said pressing portion of said print head rotating member,
- said second toothed portion of said driven gear portion is constituted of a third toothed portion and a fourth toothed portion provided in said prescribed rotation angle range while said driven gear portion further has a fifth toothed portion provided on another region of said driven gear portion other than said second toothed portion and said second toothless portion,
- the tip diameter of said third toothed portion is larger than the tip diameter of said fourth toothed portion, while at least one end of said fourth toothed portion is arranged adjacently to said third toothed portion,
- said first toothed portion of said driving gear portion and said third toothed portion of said driven gear portion first mesh with each other when said driving gear portion and said driven gear portion of said print head rotating member mesh with each other,
- the root diameter of said first toothed portion of said driving gear portion engaging with said third toothed portion of said driven gear portion is smaller than the diameter of the outer peripheral surface of said first toothless portion, and
- said third toothed portion and said fifth toothed portion of said driven gear portion hold said driving gear portion over said first toothless portion of said driving gear portion when said first toothed portion of said driving gear portion and said second toothed portion of said driven gear portion of said print head rotating member are out of mesh.
8 more elements
Dependencies are inferred from the claim text.