JPS6321629U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a partial perspective view showing a height detection mechanism and a paper out detection mechanism according to an embodiment of the present invention;
The figure is a block diagram showing an example of a control system, Figure 3 is a flowchart showing an example of control, Figure 4 is a schematic configuration diagram showing a conventional example of a laser printer, and Figure 5 is a mechanism that moves the bottom plate up and down. FIG. 6 is a partial perspective view showing an example of a conventional height detection mechanism and paper out detection mechanism. 21... Bottom plate, 23... Rocking arm, 32... Bracket, 41, 43... Light blocking plate, 42... Paper out sensor, 51... System control section, 53... Operation display section.

Claims (1)

[Scope of utility model registration request] In a paper feeding device that is equipped with a vertical mechanism for a bottom plate on which sheets of paper are loaded, and that maintains a constant height of the top of the paper placed on the bottom plate and detects when the paper runs out, a pair of light emitting elements and a a detector comprising a light receiving element; a first light shielding means for shielding the detector from light when the top of the sheet of paper placed on the bottom plate reaches a predetermined position; and the sheet of paper placed on the bottom plate disappears. and a second light shielding means for shielding the detector from light, and detecting paper out when the bottom plate is lowered by a predetermined amount at the time of starting paper feeding and the detector is in the light shielding state, and detecting the paper out at other times. A paper feeding device characterized by comprising a control means for raising the bottom plate until the container is in a light-shielded state.