1. A card processing unit for use with at least one or more cards comprising:
a card processing part for performing predetermined processing to the at least one or more cards;
a card stack part in which the at least one or more cards are stacked and stored; and
a card feeding part for carrying the at least one or more cards between the card processing part and the card stack part;
wherein the card stack part is structured such that the card stack part is capable of being separated from the card feeding part as a module;
wherein the card stack part includes a card ejection mechanism for ejecting a card to the card feeding part;
the card stack part comprises a cassette which is structured for storing a number of cards and a cassette holder into which the cassette is accommodated;
the card ejection mechanism comprises a feeding mechanism for ejecting a card which is stored in the cassette to the card feeding part, a placing part on which the cassette is placed, and a detecting mechanism for detecting a position of the card feeding part;
the feeding mechanism, the placing part and the detecting mechanism is provided in the cassette holder; and
the cassette holder is provided with a drive motor for driving the feeding mechanism which is mounted on the under side of the placing part of the cassette holder.
2. The card processing unit according to claim 1, wherein the cassette holder is provided with a feeding pawl for carrying a card which is stored in the cassette to the card feeding part, the feeding pawl being moved by the drive motor.
3. The card processing unit according to claim 1, wherein the cassette holder is provided with a control board which is connected to a main control board of the card processing unit through a connector, and the card stack part is structured to perform one unified function as the module by means of that the control board gives and receives signals to and from the main control board.
4. The card processing unit according to claim 1, wherein the card feeding part is provided with a draw-in mechanism for drawing the card which is ejected by the card ejection mechanism from the card stack part.
5. The card processing unit according to claim 4, wherein the card stack part is comprised of a plurality of the card stack parts and the plurality of the card stack parts are disposed so as to be adjacent to the card feeding part.
6. The card processing unit according to claim 5, wherein the card feeding part includes a carriage for feeding a card on which at least a part of the draw-in mechanism is mounted, and the card stack part is provided with a detecting mechanism for detecting a position of the carriage.
7. The card processing unit according to claim 6,
wherein the card feeding part includes two side plates, the carriage which is movably supported between the side plates in a direction that the plurality of the card stack parts are adjacently disposed, and a card feeding mechanism which moves the carriage in the direction that the plurality of the card stack parts are adjacently disposed; and
wherein the card feeding mechanism is provided with a motor for moving the carriage which is disposed between the side plates.
8. The card processing unit according to claim 7, wherein the draw-in mechanism includes a drive roller for drawing a card into an inside of the carriage or for feeding out a card from the inside of the carriage, a driven roller which is disposed to face the drive roller, and a drive motor for driving the drive roller.
9. The card processing unit according to claim 8, wherein
the card feeding part includes a control board for driving and controlling the draw-in mechanism; and
the card feeding part is structured to perform one unified function as a module by means of that the control board gives and receives signals to and from the main control board.
10. The card processing unit according to claim 1, wherein an ejecting direction of the card in the card stack part is perpendicular to a carrying direction of the card in the card feeding part.
11. The card processing unit according to claim 1, wherein the card stack part is disposed on one side of the card feeding part in a direction that is perpendicular to a carrying direction of the card in the card feeding part, and the card processing part is disposed on the other side of the card feeding part.
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 ball screw apparatus comprising:
a screw shaft having a first ball screw groove formed on an outer peripheral surface thereof;
a nut including:
a second ball screw groove which is formed on an inner peripheral surface thereof so as to oppose to the first ball screw groove;
a ball return through hole for circulating the balls extended in an axial direction of the screw shaft; and
ball turning members having:
a ball turning passageway communicating with both of the ball load rolling passageway and the ball return through hole, and provided at opposite end portions of the nut, respectively; and
a number of balls rolling in a ball load rolling passageway, which is formed between the first and second ball screw grooves, in accordance with a rotation of the screw shaft or the nut,
wherein
when a diameter of the balls is represented by Dw, and a diameter of the ball return through hole is represented by D1, D1\u2212Dw is 3% of Dw or more and 10% of Dw or less.
2. The ball screw apparatus according to claim 1, wherein when a diameter of the ball turning passageway is represented by D2, D2\u2212Dw is 10% of Dw or less.
3. The ball screw apparatus according to claim 1, wherein a spacer made of material which is softer than that of the balls is provided between any two adjacent balls.
4. The ball screw apparatus according to claim 3, wherein each of the spacers is formed into a disk-like shape, and is smaller in diameter than the balls.
5. The ball screw apparatus according to claim 3, wherein each of the spacers is formed into a spherical shape, and is smaller in diameter than the balls.
6. The ball screw apparatus according to claim 2, wherein a spacer made of material which is softer than that of the balls is provided between any two adjacent balls.
7. The ball screw apparatus according to claim 6, wherein each of the spacers is formed into a disk-like shape, and is smaller in diameter than the balls.
8. The ball screw apparatus according to claim 6, wherein each of the spacers is formed into a spherical shape, and is smaller in diameter than the balls.