Paper Size Detection Control - Konica Minolta Bizhub 501 Service Manual

Theory of Operation Ver.2.0 Mar. 2009
14.3.2

Paper size detection control

A. Paper size detection mechanism
(1) Size detection in the main scan direction
The side guide plate [12] is provided with the size detection actuator [7]. And interlocked with the side guide
plate, this actuator sticks out to the rear side of the tray. The size detection actuator is provided with the 2 lines
of notches, which are detected by the paper size sensors /Fr1 (PS11) [11] and /Rr1 (PS10) [10], or the paper
size sensors /Fr2 (PS17) [3] and /Rr2 (PS16) [4] equipped individually on the rear of the main body. The notches
of the size detection actuator vary for each paper size and the paper size is detected in the main scan direction
by the combination of the ON/OFF of PS10 and PS11, or PS16 and 17.
(2) Size detection in the sub scan direction
The rear guide plate [13] is provided with the size detection actuator [1], which rotates in interlock with the rear
guide plate. The size detection actuator is provided with a projection [2]. When this projection comes at the rear
side of the tray, it pushes the detection levers [9] and [6] of the paper size boards /1 (PSB/1) [8] and /2 (PSB/2)
[6] equipped on the back of the main body. 4 detection levers are equipped on each of the paper size board and
they individually turn ON and OFF the paper size detection switches /1 (SW101) to /4 (SW104) provided on each
board. On the other hand, the projections of the size detection actuator vary in their circumference and the inter-
vals between each of these projections, and accordingly, either one of the 4 detection levers is to be pushed
according to the position of the guide plate. In this way, the paper size in the sub scan direction is detected by
the combination of the ON/OFF of SW101 to SW104.
[12]
[1] Size detection actuator
[2] Projection
[3] Paper size sensor /Fr2 (PS17)
[4] Paper size sensor /Rr2 (PS16)
[5] Detection lever
[6] Paper size board /2 (PSB/2)
[7] Size detection actuator
[13]
[8] [9]
[7] [6] [5]
14. PAPER FEED SECTION (Tray 1/2)
[10] [11]
[4] [3]
[8] Paper size board /1 (PSB/1)
[9] Detection lever
[10] Paper size sensor /Rr1 (PS10)
[11] Paper size sensor /Fr1 (PS11)
[12] Side guide plate
[13] Rear guide plate
[1]
[2]
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