US 3,969,742 AGranted

Automatic engagement and metering adjustment controls for metering blade device

AssigneeAddressograph Multigraph Corporation

InventorPeter McCabe

Life of this patent

Estimating the term…

Loading patent…

Abstract

The mechanism of this invention deals with a series of gears for sequentially moving and controlling a pair of blade-like members associated with a liquid applicator roller, one of said blades serving to wipe excess liquid from the surface of the roller, and the other blade serving to press a sheet of paper against the applicator roller in order to transfer the metered amount or controlled amount of liquid from the roller surface to the paper. The gear train includes a manually movable gear for rendering operative a sequence control gear for bringing the blades into contact and out of contact with the surface of the roller, which sequence control gear has associated with it various linkage members and latching members for holding the blades in position against the surface of the roller and for triggering the drive motor for rotating the liquid applicator roller.

Claims19

Dependent claims

In a device for developing diazotype sensitized sheets by applying thereto a metered quantity of a developing liquid comprising:

a drive motor;
an applicator roller to be rotatably driven by said motor and having a surface adapted to retain thereon said metered quantity of developing liquid;
liquid supply means for supplying an excess amount of said liquid agent to said roller surface;
wiper blade means for removing excess developing liquid from the roller surface, said wiper blade means including means to movably position the blade between an operative position and an inoperative position relative to said surface;
pressure blade means for pressing said sheets against said applicator roller to transfer the metered amount of liquid from said roller to the sheets, said pressure blade means including means to movably position said blade between an operative and an inoperative position relative to said surface, wherein said pressure blade in the operative condition provides a developing zone defined by the contact area between the blade and the surface through which zone the sensitized sheet passes to be developed;
the improvement therein comprising:
a sequence control means including a gear and a lever arm in cooperative association with said gear, said lever arm being operable between a first position and a second position, a gear assembly operably mounted on said lever arm and movable between an engaged first position and disengaged second position position relative to said gear forming a mechanical interconnection between said drive motor and said gear to move said blades into their respective positions latching means;
said latching means latching the sequence control means in said first position to said gear assembly and in said second position rendering said gear assembly free to rotate relative to said sequence control.

5 more elements

A device for developing diazotype sensitized sheets by applying thereto a metered quantity of a developing liquid agent, comprising:

a drive motor;
an applicator roller to be rotatably driven by said drive motor and having a surface adapted to retain thereon said metered quantity of developing liquid;
liquid supply means for supplying an excess amount of liquid agent to said roller surface;
wiper blade means for removing excess developing liquid from the roller surface;
pressure blade means for pressing said sheets against said applicator roller to transfer the metered amount of fluid from the roller to the paper, said pressure blade providing a developing zone defined by the contact area between the blade and the surface through which zone the sensitize sheet passes to be developed;
the improvement therein comprising:
blade mounting means adapted to support said blades for movement between an operative and an inoperative position with said applicator roller while maintaining a predetermined force relationship therewith;
a gear assembly movable between an engaged and disengaged condition interconnecting said drive motor, said applicator roller means and said blade mounting means;
a sequence control element responsive to the position of said gear assembly in its engaged condition;
latching means associated with said sequence control element for initiating the movement of said blades into their operative position and for maintaining the blades in said last-named position.

7 more elements

Dependencies are inferred from the claim text.