Printer

1. A printer configured to perform printing to a print medium by using an ink ribbon, the printer comprising:

a printing unit configured to print on the print medium;

a ribbon shaft configured to hold the ink ribbon;

a partition member swingably provided in the printing unit, the partition member partitioning the ink ribbon and the print medium; and

a lock mechanism configured to hold the partition member with respect to the printing unit, wherein:

the ribbon shaft is provided on the partition member.

2. The printer according to claim 1 , further comprising:

a casing in which the printing unit is accommodated, wherein:

a motor configured to transmit drive force to the ribbon shaft is provided in the casing.

3. The printer according to claim 1 , further comprising:

a sensor having a light emitting portion and a light receiving portion, the sensor configured to detect a position of the print medium in a feed direction, wherein:

at least one of the light emitting portion and the light receiving portion is provided in the partition member.

4. The printer according to claim 1 , wherein

the partition member comprises guiding surfaces with which the print medium is brought into sliding contact.

5. The printer according to claim 1 , further comprising:

a cover configured to open and close a casing of the printer, wherein:

when the partition member is at a closed position, the printing unit is accommodated in the cover, and

when the partition member is at an open position, the printing unit is exposed from the cover.

6. The printer according to claim 5 , further comprising:

a unit lock mechanism configured to hold the printing unit with respect to the cover when the partition member is at the closed position.

7. The printer according to claim 1 , wherein:

the lock mechanism includes:

an engaged portion provided in one of the printing unit and the partition member, and

an engagement portion provided in the other one of the printing unit and the partition member, the engagement portion configured to be engaged with the engaged portion by bias force of a spring following movement of the partition member from an open position to a closed position, and

by an operation force for moving the partition member from the closed position to the open position, the lock mechanism is configured to cancel engagement between the engagement portion and the engaged portion against the bias force of the spring.

8. The printer according to claim 7 , wherein:

the lock mechanism further includes:

a hook swingably supported with respect to the printing unit or the partition member, and

the hook comprises the engagement portion and is configured to be swung in the direction in which the engagement portion is engaged with the engaged portion by the bias force of the spring.

9. The printer according to claim 8 , wherein:

the hook further comprises a regulating portion configured to regulate swing of the hook with respect to a casing of the printer.

10. The printer according to claim 1 , wherein:

the partition member is supported by the printing unit with one end side of the partition member as a supporting point, and

the lock mechanism positions the other end side of the partition member with respect to the printing unit.

11. The printer according to claim 1 , wherein:

the partition member is supported by the printing unit with one end side of the partition member as a supporting point, and

lock mechanisms are arranged in both end portions of the partition member in the axial direction of the supporting point.

12. The printer according to claim 1 , further comprising:

a first gear provided in the printing unit and a second gear provided on the ribbon shaft that transmit drive force to the ribbon shaft mesh with each other.