Sheet feeder with optical sensor
View Patent ↗According to an aspect of the invention, there is provided a sheet feeder including; an air blowing unit floating and separating an upper portion of sheet of paper laid on a tray; and a transfer belt adsorbing and transferring uppermost sheet of paper laid on the tray; an optical analog sensor sensing an upper face of the uppermost sheet of paper and comprising a sensing face including a light receiving surface; a shield plate movable with the sheet, the shield plate detecting a position of upper face of the sheet of paper so as to keep a position of the uppermost sheet at a constant position and comprising; an elastic shield member having a C-character shape, a surface of the elastic shield member where the elastic shield member is contact with the light receiving surface of the optical analog sensor being in the same plane of a surface of the elastic shield member where the elastic shield member is contact with the shield-plate.
1. A sheet feeder comprising:
an air blowing unit floating and separating an upper portion of a sheet of paper laid on a tray; a transfer belt adsorbing and transferring an uppermost sheet of paper laid on the tray;
an optical analog sensor sensing an upper face of the uppermost sheet of paper and comprising a sensing face including a light receiving surface; and
a shield plate movable with the sheet, the shield plate detecting a position of an upper face of the sheet of paper so as to keep a position of the uppermost sheet at a constant position,
an elastic shield member, within and partially parallel with the shield plate, which is in contact with a surface of the shield plate at a side facing toward a light emitting surface of the optical analog sensor,
wherein the shield plate comprises:
a first surface facing toward the light emitting surface of the optical analog sensor; and
a second surface facing toward the light receiving surface of the optical analog sensor, and
wherein the elastic shield member comprises:
a first end at which the elastic shield member is in contact with the first surface of the shield plate; and
a second end at which the elastic shield member is in slide-contact with the light receiving surface of the optical analog sensor.
2. The sheet feeder of claim 1 , wherein the elastic shield member is bonded to the surface of the shield plate.
3. The sheet feeder of claim 1 , wherein the shield plate includes an opening, and
wherein the elastic shield member extends through the opening.
4. The sheet feeder of claim 1 , wherein a portion of the shield plate has a C-shaped configuration, and
wherein the elastic shield member extends through the C-shaped portion.
5. The sheet feeder of claim 1 , wherein the light receiving surface and the surface of the shield plate substantially face the same direction.
6. The sheet feeder of claim 1 , wherein the elastic shield member crosses through the first and second surfaces of the shield plate.
7. A sheet feeder comprising:
an air blowing unit floating and separating an upper portion of a sheet of paper located on a tray;
a transfer belt adsorbing and transferring an uppermost sheet of paper located on the tray;
an optical analog sensor sensing an upper face of the uppermost sheet of paper and comprising a sensing face including a light receiving surface;
a shield plate movable with the sheet, the shield plate detecting a position of an upper face of the sheet of paper so as to keep a position of the uppermost sheet at a constant position; and
an elastic shield member which is in contact with a surface of the shield plate at a side facing toward a light emitting surface of the optical analog sensor,
wherein the shield plate comprises:
a first surface facing toward the light emitting surface of the optical analog sensor; and
a second surface facing toward the light receiving surface of the optical analog sensor, and
wherein the elastic shield member comprises:
a first end at which the elastic shield member is in contact with the first surface of the shield plate; and
a second end at which the elastic shield member is in slide-contact with the light receiving surface of the optical analog sensor.
8. The sheet feeder of claim 7 , wherein the elastic shield member is bonded to the surface of the shield plate.
9. The sheet feeder of claim 7 , wherein the shield plate includes an opening,
wherein the elastic shield member extends through the opening.
10. The sheet feeder of claim 7 , wherein a portion of the shield plate has a C-shaped configuration, and
wherein the elastic shield member extends through the C-shaped portion.
11. The sheet feeder of claim 7 , wherein the elastic shield member crosses through the first and second surfaces of the shield plate.
12. The sheet feeder of claim 11 , wherein the light receiving surface and the first surface of the shield plate substantially face the same direction.
13. An elastic shield member with a sheet feeder, the sheet feeder comprising:
an optical analog sensor for sensing an upper face of an uppermost sheet of paper,
wherein the optical analog sensor comprises a sensing face including a light receiving surface and a shield plate movable with the sheet, the shield plate detecting a position of an upper face of the sheet of paper so as to keep a position of the uppermost sheet at a constant position, and
wherein the elastic shield member is in contact with a surface of the shield plate at a side facing toward a light emitting surface of the optical analog sensor,
wherein the shield plate comprises:
a first surface facing toward the light emitting surface of the optical analog sensor; and
a second surface facing toward the light receiving surface of the optical analog sensor, and
wherein the elastic shield member comprises:
a first end at which the elastic shield member is in contact with the first surface of the shield plate; and
a second end at which the elastic shield member is in slide-contact with the light receiving surface of the optical analog sensor.
14. The elastic shield member of claim 13 , wherein the elastic shield member crosses through the first and second surfaces of the shield plate.
15. The elastic shield member of claim 13 , wherein the sheet feeder includes an air blowing unit floating and separating an upper portion of a sheet of paper laid on a tray and a transfer belt adsorbing and transferring the uppermost sheet of paper laid on the tray.
16. The elastic shield member of claim 13 , wherein the elastic shield member is configured to be bonded to the surface of the shield plate.
17. The elastic shield member of claim 13 , wherein the shield plate includes an opening, and
wherein the elastic shield member is configured to extend through the opening.
18. The elastic shield member of claim 13 , wherein a portion of the shield plate has a C-shaped configuration, and
wherein the elastic shield member is configured to extend through the C-shaped portion.
19. The elastic shield member of claim 13 , wherein the light receiving surface and the surface of the shield plate substantially face the same direction.