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HP LASERJET ENTERPRISE M855 - Page 242

HP LASERJET ENTERPRISE M855
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Figure 1-177 Stapling operation (2 of 2)
M41
Staple motor drive signal
Stapler HP detect signal
Hook top position detect signal
Hook empty detect signal
Stacker controller PCA
Stitcher (stapler) unit
The stitcher base unit includes two stitchers and stitcher bases. The stitchers are fixed in position and
do not slide or swing. Stitching begins when the stitcher motor (M7, M6) drives the rotary cam. The
front and rear stitcher units operate with a time delay to prevent wrinkling of paper and to limit the
load applied to the power supply. The stitcher home-position sensor (SW7, SW5) monitors the
movement of the rotary cam and allows identification of individual stitcher operations. The staple
sensor (SW6, SW4) detects the presence or absence of staples inside the staple cartridge. The
alignment plates keep both edges of the stack in place while stitching takes place.
Figure 1-178 Stitcher unit
200 Chapter 1 Theory of operation ENWW

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