Static build-up control in dispensing system
View Patent ↗Apparatus for dispensing paper from rolls which feeds continuously, roll to roll, and does not require extra procedure to bring stub roll into position. The apparatus holds and positions at least first and second rolls of paper with respect to each other, dispensing paper from the first and second rolls simultaneously when the first roll reduces to a predetermined diameter of paper, positioning the depleted first roll for replacement without the necessity of removing the second roll; and dispensing from the second and replacement rolls simultaneously when the second roll reduces to a predetermined diameter of paper. The apparatus also has a proximity sensor, which senses when a hand is placed near the dispenser, and thereupon dispenses a set amount of towel. The dispenser dissipates static charges to a local ground such as a high impedance wall surface on which the dispenser is mounted.
1. A dispenser for dispensing flexible sheet material comprising:
an ungrounded chassis;
a feed mechanism fixed to the chassis, the feed mechanism including at least one roller and being adapted to advance sheet material from a roll of sheet material across the roller;
an electronic controller device affixed to the chassis proximate to the roller and not directly connected to any earth ground, the controller device being adapted to control dispensation of the sheet material; and
a low impedance conductive path extending from the roller to a mounting member of the chassis, the mounting member being adapted to affix the chassis to a support surface, said support surface being formed of a high impedance material that is only indirectly connected to said earth ground to thereby provide a high impedance around connection, wherein the mounting member provides an electrical mechanical contact between the dispenser and the support surface whereby any static electricity charge built-up on the at least one roller as a result of dispensing sheet material is dispersed through the low impedance conductive path onto the high impedance support surface and though the high impedance support surface to the earth ground.
2. The dispenser of claim 1 , wherein the roller includes a roller shaft rotatably mounted to the chassis, and wherein the conductive path include a compression spring in contact with the roller shaft.
3. The dispenser of claim 2 , wherein the compression spring is biased against the roller shaft.
4. The dispenser of claim 1 , wherein the controller device is battery powered, the dispenser is located in an area having a relative humidity of at least 5%, and the high impedance support surface is a damp wall.