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US 12,679,119 B2Granted
Drum conveyance mechanism and image forming apparatus
AssigneeRicoh Company, Ltd.
InventorShu Umehara
Life of this patent
Estimating the term…
Abstract
A drum conveyance mechanism includes a drum, a drive motor to rotate the drum to convey a sheet medium along an outer circumferential surface of the drum, a first power supply to supply an operating voltage to the drive motor, a driven roller to rotate as the drum rotates, a rotation brake to prevent rotation of the driven roller, a second power supply to supply an operating voltage to the rotation brake, and a power supply switch to switch a state of supply of the operating voltage from the first power supply and the second power supply.
Claims6
A drum conveyance mechanism comprising:
- a drum;
- a drive motor configured to rotate the drum to convey a sheet medium along an outer circumferential surface of the drum;
- a first power supply configured to supply an operating voltage to the drive motor;
- a driven roller configured to rotate as the drum rotates;
- a rotation brake configured to prevent rotation of the driven roller;
- a second power supply configured to supply an operating voltage to the rotation brake;
- and
- a power supply switch configured to switch a state of supply of the operating voltage from the first power supply and the second power supply, wherein
- the power supply switch is further configured
- not to supply the operating voltage from the second power supply to the rotation brake in a first state where the operating voltage is supplied from the first power supply to the drive motor, and
- to supply the operating voltage from the second power supply to the rotation brake in a second state, as a state of non-supply, where the operating voltage from the first power supply to the drive motor is interrupted, and
- the power supply switch includes
- an a-contact switch having an input end and an output end, the input end of the a-contact switch coupled to the first power supply, the output end of the a-contact switch coupled to the drive motor, the a-contact switch closed in the first state, the a-contact switch opened in the second state, and
- a b-contact switch having an input end and an output end, the input end of the b-contact switch coupled to the second power supply, the output end of the b-contact switch coupled to the rotation brake, the b-contact switch opened in the first state, the b-contact switch closed in the second state.
11 more elements
An image forming apparatus comprising:
- an image forming device to form an image on a sheet medium;
- and
- a conveyor to convey the sheet medium to the image forming device,
- the conveyor including a drum conveyance mechanism including
- a drum;
- a drive motor configured to rotate the drum to convey a sheet medium along an outer circumferential surface of the drum;
- a first power supply configured to supply an operating voltage to the drive motor,
- a driven roller configured to rotate as the drum rotates,
- a rotation brake configured to prevent rotation of the driven roller,
- a second power supply configured to supply an operating voltage to the rotation brake, and
- a power supply switch configured to switch a state of supply of the operating voltage from the first power supply and the second power supply, wherein
- the power supply switch is further configured
- not to supply the operating voltage from the second power supply to the rotation brake in a first state where the operating voltage is supplied from the first power supply to the drive motor, and
- to supply the operating voltage from the second power supply to the rotation brake in a second state, as a state of non-supply, where the operating voltage from the first power supply to the drive motor is interrupted, and
- the power supply switch includes
- an a-contact switch having an input end and an output end, the input end of the a-contact switch coupled to the first power supply, the output end of the a-contact switch coupled to the drive motor, the a-contact switch closed in the first state, the a-contact switch opened in the second state, and
- a b-contact switch having an input end and an output end, the input end of the b-contact switch coupled to the second power supply, the output end of the b-contact switch coupled to the rotation brake, the b-contact switch opened in the first state, the b-contact switch closed in the second state.
14 more elements
Dependencies are inferred from the claim text.