Lifting device for stripping and blanking operations
A deflectable lifting device can be mounted to a support form, work surface or other member of a material conveyance system. According to embodiments, the deflectable lifting device can have a base that mounts into the support, and a bendable arm arranged in the pathway of a material conveyance system, such as a paper stripping or paper blanking work station. When a sheet or web of material travels over the deflectable lifting device, the bendable arm can bend and deflect downwards, but still contact the sheet or web with a gently humped or arcuate portion, providing a small margin of elevation or lift to the sheet or web. The sheet or web can therefore be elevated above edges, holes, or other obstructions in the pathway that could jam or snag the delivery of the material. The deflectable lifting device can comprise an arcuate portion or head over which the sheet or web can slide in a bearing fashion.
1. A deflectable lifting device for lifting a sheet or web of material in a conveying system, comprising:
a horizontal base comprising a leading edge, a trailing edge, a bottom surface, and a top surface, the horizontal base having a base length that extends from the leading edge to the trailing edge;
a first vertical riser comprising a leading edge that intersects with the leading edge of the horizontal base, and a trailing edge that intersects with the top surface of the horizontal base, the first vertical riser extending vertically upward from the horizontal base and rising higher than the top surface of the horizontal base;
a second vertical riser comprising a leading edge that intersects with the top surface of the horizontal base, a trailing edge that intersects with the trailing edge of the horizontal base, and a top surface, the second vertical riser extending vertically and perpendicularly upward from the horizontal base and rising higher than the top surface of the horizontal base;
a recess defined by and limited by the top surface of the horizontal base, the trailing edge of the first vertical riser, and the leading edge of the second vertical riser, the recess having a length that is less than the base length; and
a bendable arm directly connected to the first vertical riser and extending generally toward the second vertical riser, the bendable arm having a length that is less than the length of the recess and residing in a normally biased, upwardly extended position when no sheet or web of material is in contact therewith, the bendable arm comprising a portion that extends above the top surface of the second vertical riser when in the normally biased, upwardly extended position, and comprising a distal end that extends downwardly,
wherein the bendable arm is configured to elastically deform downwardly with a spring action such that the distal end is received in the recess below the top surface of the second vertical riser in response to an applied force and then the bendable arm returns to its normal, unbiased, upwardly extended position when the applied force is removed.
2. The deflectable lifting device of claim 1 , wherein the horizontal base comprises at least one protrusion configured to create a friction fit, snap-fit, or compression fit in a mounting slot of a support frame.
3. The deflectable lifting device of claim 2 , wherein the at least one protrusion comprises a plurality of protrusions.
4. The deflectable lifting device of claim 2 , wherein the at least one protrusion comprises one or more ribs, nibs, or teeth.
5. The deflectable lifting device of claim 2 , wherein the at least one protrusion comprises a width-wise bulge.
6. The deflectable lifting device of claim 1 , wherein the horizontal base portion comprises at least one base slot extending upwardly from the bottom surface and that relieves flex or tension imposed on the deflectable lifting device when under load.
7. A system comprising a support frame, a slot in the support frame, and the deflectable lifting device of claim 1 disposed in the slot.
8. A stripping station for stripping a sheet or web of material, comprising a support frame, a slot in the support frame, and the deflectable lifting device of claim 1 disposed in the slot.
9. The deflectable lifting device of claim 1 , wherein the deflectable lifting device comprises a plastic material.
10. The deflectable lifting device of claim 1 , wherein the deflectable lifting device comprises a resin material.
11. The deflectable lifting device of claim 1 , wherein the deflectable lifting device comprises a polyurethane.
12. The deflectable lifting device of claim 1 , wherein the deflectable lifting device comprises a molded acetal resin.