Printer
OwnerKeiichi Chiba, Hironobu Takasawainventors
Life of this patent
Estimating the term…
Abstract
A printer of the present invention includes drive pulleys each being mounted on a particular print drum. The print drums each has a pitch circle diameter and a number of teeth related to each other as: d/z<1 where d denotes a pitch circle diameter and z denotes a number of teeth. The printer can therefore use a timing belt having a pitch of 3 mm or less designed for accurate transmission. This reduces jitter between the timing belt and the toothed drive pulleys and reduces the positional deviation of a core wire included in the timing belt, thereby reducing an offset ghost.
Claims8
In a synchronous driving device including a drive member and a driven member, drive pulleys each being mounted on one of said drive member and said driven member, and a timing belt passed over said drive pulleys for causing said drive member and said driven member to rotate in synchronism with each other, said drive pulleys each has a pitch circle diameter and a number of teeth related as:
- d/z<1
- where d denotes a pitch circle diameter and z denotes a number of teeth.
In a synchronous driving device including a drive member and a driven member, drive pulleys each being mounted on one of said drive member and said driven member, and a timing belt passed over said drive pulleys for causing said drive member and said driven member to rotate in synchronism with each other, said drive pulleys each has a pitch of 3 mm or less.
In a printer including a plurality of print drums spaced from each other in a direction of paper conveyance, toothed drive pulleys each being mounted on one of said plurality of print drums, and a timing belt passed over said toothed drive pulleys for allowing said plurality of print drums to rotate in synchronism with each other, said toothed drive pulleys each has a pitch circle diameter and a number of teeth related as:
- d/z<1
- where d denotes a pitch circle diameter and z denotes a number of teeth.
In a printer including a plurality of print drums spaced from each other in a direction of paper conveyance, toothed drive pulleys each being mounted on one of said plurality of print drums, and a timing belt passed over said toothed drive pulleys for allowing said plurality of print drums to rotate in synchronism with each other, said toothed drive pulleys each has a pitch of 3 mm or less.
A-device for driving a drive side and a driven side in synchronism, comprising:
- a rotary member with a toothed drive pulley positioned at the drive side;
- a rotary member with a toothed drive pulley positioned at the driven side;
- and
- a timing belt passed over said toothed drive pulleys for causing said rotary members to rotate in synchronism with each other;
- wherein said toothed drive pulleys each has a pitch circle diameter and a number of teeth related as:
- d/z<1
- where d denotes a pitch circle diameter and z denotes a number of teeth.
A device for driving a drive side and a driven side in synchronism, comprising:
- a rotary member with a toothed drive pulley positioned at the drive side;
- a rotary member with a toothed drive pulley positioned at the driven side;
- and
- a timing belt passed over said toothed drive pulleys for causing said rotary members to rotate in synchronism with each other;
- wherein said toothed drive pulleys each has a pitch of 3 mm or less.
A printer comprising:
- a plurality of print drums spaced from each other in-a-direction of paper conveyance;
- toothed drive pulleys each being mounted on one of said plurality of print drums;
- and
- a timing belt passed over said toothed drive pulleys for allowing said plurality of print drums to rotate in synchronism with each other;
- wherein said toothed drive pulleys each has a pitch circle diameter and a number of teeth related as:
- d/z<1
- where d denotes a pitch circle diameter and z denotes a number of teeth.
A printer comprising:
- a plurality of print drums spaced from each other in a direction of paper conveyance;
- toothed drive pulleys each being mounted on one of said plurality of print drums;
- and
- a timing belt passed over said toothed drive pulleys for allowing said plurality of print drums to rotate in synchronism with each other;
- wherein said toothed drive pulleys each has a pitch of 3 mm or less.
Dependencies are inferred from the claim text.