Light emitting diode printer

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS.
2 and 3, an upper body frame 2 is detachably mounted on a lower body frame 1.
A bent LED frame 3 with a lever 3' is pivotally mounted on a hinge 8 in the upper body frame 2 to support an LED head array 4 beneath the right end portion thereof.
A spring 5 is connected between the upper body frame 2 and the right end portion of the LED frame 3.
A process unit 6 includes an upper leading end 7 together with a photosensitive drum 11.
When the process unit 6 is installed inside a unit guide 9 with an upper opening 10, the upper leading end 7 pushes the lever 3' so that the distance between the photosensitive drum 11 and LED head array 4 is properly maintained, as shown in FIG.
3.
When the process unit 6 is removed from the inside of the unit guide 9, as shown FIG.
2, the right end portion of the LED frame 3 supporting the LED head array 4 moves upwardly out of the upper opening 10 of the unit guide 9 by the recovering force of the spring 5, thus sufficiently separating the LED head array 4 from the photo-sensitive drum 11.
Namely, the LED frame 3 is pivoted on the hinge 8 to the inoperative position by the recovering force of the spring 5 connected between the upper body frame 2 and LED frame 3.
On the contrary, if the process unit 6 is inserted into the unit guide 9, the upper leading end 7 pushes upwardly the lever 3' of the LED frame 3, so that the LED frame 3 is pivoted on the hinge 8 to downwardly move right end portion thereof supporting the LED head array 4 into the upper opening 10 of the unit guide 9.
Hence, the distance between the photo-sensitive drum 11 and LED head array 4 is properly maintained, as shown in FIG.
3.
Thus, the changing of the process unit may be easily achieved.
In another embodiment of the present invention as shown in FIGS.
4 and 5, a pivot 12 with an upper left sloped surface 13 is provided in the lower body frame 1 instead of the upper leading end 7 of the process unit 6 for pushing the lever 3' as shown in the previous embodiment