Description
Feeding Station
The WPC has been designed for combination with different mobile feeders, for example Rotary Disc Feeder, type DF, or Timed Vacuum Belt Feeder, type BF . All feeders can be connected in the minimum amount of time, by mechanical gear fork and electrical plug. Chain Conveyor Unit Two conveyor chains, adjustable in length direction by quick change driver blocks for precise positioning and in cross direction by means of spindles. The chains run in plastic guides. The top guide bars can be lifted together pneumatically by push-button to facilitate set-up.
Vacuum Belt Transport Station
Following the chain conveyor unit, the blanks are taken over by rubber rollers, and are transferred by vacuum belts to the delivery. Thanks to this system, neither lateral nor top guides are required. This eliminates adjustment work.
The suction air is generated by separate suction pumps mounted at the side of the machine which is part of the delivery scope. The suction air can be controlled separately for each belt (depending on blank size and shape).
Gluing Station
The new gluing system combines both the advantages of a two roller gluing station with a driven metering roller covering the whole gluing section and those of a glue application limited from both sides with side scraper and fixed doctor blade. Thus the new system offers the optimum solution for every possible application.
In both systems, a stencil cylinder with precise height adjustment applies the glue to the flat carton blank transported on the vacuum belts.
If one or several blanks are missing, the vacuum belts lower automatically, in order to avoid glue application to the belts.
To set the stencil cylinder in running direction, there is a motorized stepless adjustment. In cross direction, it is set by spindles with hand wheel. Even during machine operation, the stencil position can be rectified, to guarantee a precise glue application.
For cleaning purposes, the gluing unit can be withdrawn from the machine by lateral, easy-running guides. A separate drive keeps the glue rollers turning in case of machine stop. The drive engages and disengages automatically when the machine stops and starts again.
The gluing stencils can be prepared on a separate stencil preparation table provided with a scale outside the machine. They are glued onto a stencil blanket. The complete mounted stencil is clamped onto the stencil cylinder. At the end of a production run, the mounted stencil can be taken off and stored for future use.
Feeder for flexible or semi flexible blanks
This station consists of four rotating servo driven suction arms, a magazine and a pressing roller.
The complete feeder can be adjusted in cross direction. Furthermore the magazine can be adjusted in vertical direction by means of spindles and additionally it can be pivoted to alter the distance of pick-up point relatively to the suction arms. All these a.m. adjustments can be carried out during operation.
Top and bottom rails can be individually adjusted by spindles. Additionally the entire group of top rails can be moved in vertical direction by a central spindle. Air jets facilitate separation of the blanks at the pick-up point. Oscillating bottom rails minimise friction to enable free transportation of blanks toward the pick-up point. Side rails can be set in cross and vertical direction by quick-set system.
A pressure roller with micro adjustment ensures perfect marring of blank and substrate.
An integrated electronic register control ensures application tolerances of +/- 0,75 mm in running direction and less. This system detects also missing blanks. In this case the pressing roller will be lifted to avoid glue application to this roller. The position of the applied blank in relation to the substrate is steplessly adjustable in running direction without stopping the machine.
Delivery
The whole section can be moved sideways to allow easy access to the tensioning system for the vacuum belts.
The delivery belt has a separate drive, which can be regulated steplessly and allows a variable shingling of the blanks.
An upper vacuum delivery belts - adjustable across the entire machine width ensures perfect shingling even of complicated blanks.
Counter/ Control Devices
The delivery scope of the basic machine is completed with a digital speed counter, a counter of the total production figures with photocell as well as the following control devices
| 1 | blank positioning control behind the feeder, in order to avoid jam in the chain conveyor unit |
| 2 | jam control in the blank delivery section |
The entire electronic can by controlled and serviced via modem from our electronic department in Erkrath.