Tape Loading / Threading; Theory Of Operation - 3M 40800 Instructions And Parts List

7-INSTALLATION AND SET-UP (continued)
For boxes which are fully packed with products
that support the top fl aps, the adjustment of
this regulator is not critical since the boxes can
support the pressure of the upper frame (drive
belts) at a wide range of regulator settings.
However, if under-fi lled or fragile boxes are
sealed, this regulator can be used to set the
upper frame pressure to a minimum that is
still adequate to positively convey the box and
to prevent damage of boxes, The regulator
setting can be locked by securing the lock nut
on the regulator shaft as shown in Figure 7-16.
Note – A precision regulator is used to balance the
top drive assembly. Due to the self relieving feature
of this regulator a small amount of air will continually
vent to the atmosphere. This is normal and amounts
to approximately 3 liter/min [0.1 SCFM ].
8. Main Air Pressure Gauge
Indicates main air regulator pressure setting. Air
regulator should be adjusted so gauge reads 5 bar
gauge pressure [70 PSIG].
9. Mechanical Latch, Upper Drive Assembly –
Figure 7-17
The mechanical latch is provided to hold the upper
drive assembly at the fully raised position for tape
threading and maintenance.
To raise and latch the upper drive assembly:
1. Push and hold the upper frame raising
switch "A".
2. Push and hold latching knob "B".
3. Release switch "A".
4. Release knob "B".
5. Shut off air supply.
To release and lower the upper drive assembly:
1. Turn on air supply.
2. Push and release switch "A".
10. Indicator, Air Pressure
An "Optical Warning Indicator" for the compressed
air circuit of the machine is located on the upper
drive assembly just behind the red "Stop" button.
When indicator is "Red", air circuit is on.
Important – Before turning drive belts on, be sure
no tools or other objects are on the conveyor bed.
CAUTION
• To reduce the risk associated with
pinch and entanglement hazards:
− Always feed boxes into the machine by
pushing only from the end of the box
− Keep hands clear of the upper head
support assembly as boxes are
transported through the machine
• To reduce the risk associated with
pinch and impact hazards:
− Keep away from the pneumatically
controlled upper drive assembly and
box centering guides when air and
electric supplies are on
700rks
B
7.16 Tape Loading/Threading - See Manual 2.
Note – If lower tape drum is mounted in alternate lower
outboard position, remove taping head from machine
bed by pulling straight up, insert threading needle in
taping head and replace taping head. Install tape roll
on drum (adhesive on tape leg up), thread tape under
knurled roller on outboard mount, then attach tape to
threading needle and pull tape through taping head
with threading needle.

7.17 Theory of Operation

The air supply powers movement of the centering
guides and upper drive assembly to automatically adjust
the case sealer to the box size being sealed as follows:
1. A box centering switch in the center of the infeed
roller conveyor actuates movement of the centering
guides. When the operator pushes a box onto the
infeed conveyor, as shown in Figure 7-18, the
lever is depressed causing the air cylinder powered
centering guides to move inward, thereby centering
the box.
2. Once the box is centered by the guides, the operator
pushes the box against the raising switch on the
upper drive assembly, as shown in Figure 7-19,
causing the upper taping head to be raised by two
air cylinders. The upper taping head will continue to
rise above the box height so the operator can insert
the box underneath the upper drive belts.
• To reduce the risk associated with
pinch and entanglement hazards:
− Keep hands, hair, loose clothing, and
jewelry away from moving belts and
taping heads
29
Figure 7-17 –
Mechanical Latch
CAUTION
2010 January
A