What is claimed is:
1. A multiplex voltage measurement apparatus, comprising:
(N1) voltage detection terminals connected to N serially connected voltage sources;
a capacitor which is charged with a voltage value of any of the N voltage sources;
a first sample switch for selectively connecting odd-numbered voltage detection terminals among the (N1) voltage detection terminals to a first terminal of the capacitor;
a second sample switch for selectively connecting even-numbered voltage detection terminals among the (N1) voltage detection terminals to a second terminal of the capacitor;
a voltage measurement circuit for measuring the voltage value stored in the capacitor;
a third sample switch for connecting the first terminal and the second terminal of the capacitor to the voltage measurement circuit; and
a polarity controller for controlling the first and second sample switches such that one of the N voltage sources is selected while the third sample switch is open.
2. A multiplex voltage measurement apparatus according to claim 1, wherein the polarity controller allows the first and second sample switches to sequentially select among the N voltage sources in a one-by-one manner such that the capacitor is alternately charged with voltage values having opposite polarities.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A transfer apparatus comprising:
a transfer roller which opposes an image carrier to transfer developer carried on a peripheral surface of the image carrier onto a recording medium conveyed along a conveyance path, and is configured to rotate in synchronization with the conveyance of the record medium;
a guide-member supporting frame which is provided at an upstream of a transferring portion where the image carrier and the transfer roller are closest, in the conveyance path, and is provided at a side of the transfer roller with respect to the conveyance path;
a flexible guide member which has a thin plate shape as seen in a side sectional view, and is attached to the guide-member supporting frame at an upstream of the transferring portion in the conveyance path to guide the record medium to the transferring portion; and
a inflexible protrusion supporting member which has a rigid shape as seen in a side sectional view, and is provided on the guide-member supporting frame between the transferring portion and the guide member in the conveyance path, and which protrudes toward the conveyance path such that the protrusion supporting member supports a trailing edge of the record medium after the trailing edge of the record medium passes the guide member,
wherein the guide member includes:
a fixed portion which is fixed to the guide-member supporting frame; and
a swing portion which is provided at one end side thereof opposite to the fixed portion as seen along the conveyance path and at a downstream in the conveyance path to be closer to the conveyance path than the fixed portion, and
wherein the protrusion supporting member is provided to abut the guide member while the guide member does not protrude from the protrusion supporting member to a side of the transferring portion when the swing portion of the guide member swings to approach the guide-member supporting frame by abutting the record medium.
2. The transfer apparatus according to claim 1,
wherein a portion of the guide member abutting the guide-member supporting frame and closest to the transferring portion when the swing portion of the guide member swings to approach the guide-member supporting frame by abutting the record medium is defined as a supporting portion,
wherein a direction which is perpendicular to a straight line connecting the supporting portion and the transferring portion, and is perpendicular to a rotation axis line direction of the transfer roller is defined as a conveyance-surface normal direction, and
wherein the protrusion supporting member is provided at a position where the protrusion supporting member overlaps a tip end of the guide member on a swing portion side, in the conveyance-surface normal direction when the swing portion abuts the protrusion supporting member.
3. The transfer apparatus according to claim 1,
wherein the protrusion supporting member is made of a non-foaming synthetic resin.
4. The transfer apparatus according to claim 3,
wherein the protrusion supporting member is formed integrally with the guide-member supporting frame seamlessly.
5. The transfer apparatus according to claim 1,
wherein an end portion of the protrusion supporting member on the conveyance path side protrudes toward the conveyance path from a straight line connecting the transferring portion and a supporting portion which is a portion of the guide member abutting the guide-member supporting frame and closest to the transferring portion when the swing portion of the guide member swings to approach the guide-member supporting frame by abutting the record medium.