Operation; Punched Hole No. Switching Operation (Pk-505 Only); Punch Standby Position Movement Control (For Explanation, The Part Number For Pk-505 Is Used.) - Konica Minolta DF-606 Service Manual

Theory of Operation Ver1.0 Jun.2005
4.2

Operation

4.2.1

Punched hole No. switching operation (PK-505 only)

Number of punched holes of PK-505 is switched between 2 to 4 and 2 to 3 holes depending on the country.
Number of punched holes is switched by the rotating direction of the punch motor (M301) [3].
The motor M301 drives the slide link in the main scanning direction through the eccentric cam. As a result, the
projection of the switching cam is pushed in the slide link moving direction and the switching cam is rotated
around its axis.
The projection of the punch blade is fitted into the groove of the switching cam. In the 2 to 3 punched hole
mode, the groove of the switching cam of the 3-hole punching blade is shaped so that the rear side is concen-
tric with the rotating axis and the front side is curved toward the rotating axis. For this reason, when the switch-
ing cam is rotated clockwise, the punching blade is driven downward and when the cam is rotated
counterclockwise, the punching blade is not driven. The shape of the groove of the punching blade for 2 holes is
contrary to it on the right and left sides. When the switching cam is rotated counterclockwise, the punching
blade is driven.
When the number of punched holes is switched to 2 to 4 holes, the 2 punching blades at both ends are driven
only when the switching cam is rotated clockwise in the same way as in the 2 to 3 hole mode. As the 2 punching
blades at the center should be driven in both cases of 2 or 4 hole punching, shape of the groove of the switch-
ing cam is symmetrical on the right and left sides and both the front and rear sides are curved in the rotating axis
direction.
4.2.2 Punch standby position movement control (For explanation, the part number for PK-505 is
used.)
Turning ON the device, the punch shift motor (M302) rotates to move the punch unit [6] to the home position
until the punch shift home sensor (PS303) turns ON.
Selecting the punch mode, M302 rotates to move the punch unit [6] so that the paper size sensor (PS305) [1] of
the punch unit [6] is positioned 5 mm inward [2] from the side edge of the paper.
PS305 consists of 5 sensors. Each sensor detects the following paper.
Sensor
1 A5R, 5.5 x 8.5R
2 B5R, 16KR
3 A4R, A5, 8.5 x 11R, 8.5 x 14R, 5.5 x 8.5, F4
4 B4, B5, 8K, 16K
5 A3, A4, 11 x 17, 8.5 x 11
* The sensors are numbered 1 to 5 from the front side
And, when the stand-by position is 5 mm for B5 and B4 paper sizes, the corner of the paper passes through
below the punch hole and the stand-by position is changed to 1.5 mm to prevent the hitching of the paper.
Paper size
4. PUNCH SECTION
9