Bellows Vacuum Cups – “B Cups”Request a Quote Contact Us

Bellows vacuum cups are used when it is necessary to compensate for varying workpiece heights, to handle parts with uneven (concave, convex, or textured) surfaces, or easily damaged parts. A lifting effect during evacuation can be used to help separate a top sheet from those stacked below. Bellows vacuum cups can conform to curved or uneven workpieces such as pipes, bottles, containers, cylinders, car body components, flexing cardboard boxes, etc. Bellows vacuum cups provide height compensation and a ball-join motion through a limited angular range.
Suitable Workpiece Surface:
  • Flat
  • Slightly Concave
  • Convex
  • Compound
  • Spherical
  • Cylindrical
  • Flexible
  • Shear Loads
Bellows vacuum cups have a relatively wide sealing lip that lays against the workpiece surface without scrubbing radially outward as the cup collapses under vacuum. This helps prevent the marriage of highly finished surfaces such as injection molded plastic parts or for delicate items such as electronic components.
Because they have a longer stroke, bellows vacuum cups provide easier handling of products packed in boxes or blister packs. For palletizing applications, the stroke length can compensate for small differences in box heights due to any imperfection in forming the boxes or gluing the flaps. The domed top provides some angular conforming capability which allows for a good grip even when the box top deforms under the load.
In operation, bellows vacuum cups should remain fully collapsed against the workpiece. If a “springing” action is noticed when the workpiece is lifted or transported, this indicates that the vacuum level is not deep enough to securely hold the workpiece. A larger capacity vacuum pump may be necessary in this situation.
Bellows vacuum cups are also known as: short bellows, 1.5 bellows, single bellows cup, 1-1/2 bellows pad