Gas supply mechanism for erasing machines

Claim 2

A gas supply mechanism for attachment to a motor driven erasing machine having gas passage means defined therein for directing a flow of gaseous medium from said gas supply mechanism against the surface being erased by said erasing machine for the purpose of cooling the eraser and the surface being erased and for removal of erasure particles from the immediate surface area being erased, said gas supply mechanism comprising: housing means; means disposed within said housing means for developing a flow of compressed gaseous medium; and connection means extending from said housing means and establishing releasable connection between said gas supply mechanism and said erasing machine said connection means also establishing fluid communication between said gas supply mechanism and said gas passage means of said erasing machine.

Claim 3

A gas supply mechanism as recited in claim 1: said means for developing a flow of compressed gaseous medium being a pump; and said connection means connecting said pump in driven relation to the motor of said motor driven erasing machine.

Claim 4

A gas supply mechanism as recited in claim 2: said pump having a shaft carried in rotary relation by said erasing housing means, said shaft having a rotor formed eccentrically thereon; said erasing machine having an electrically energized rotary motor including a rotary armature; and said shaft being disposed in releasable driven connection to the armature of the motor of said erasing machine.

Claim 5

A gas supply mechanism for attachment to an electrically driven erasing machine, having a chuck mechanism receiving a strip of erasing material defining a gas passage for directing a flow of gaseous medium against the surface to be erased, said gas supply mechanism comprising: a gas supply housing having gas inlet means formed therein; a rotor shaft being supported for rotation within said gas supply hosuing and having a gas outlet passage defined therein; a rotor being eccentrically carried by said rotor shaft and being oscillatable within said gas supply housing upon rotation of said shaft; rotor follower vane means being carried within said gas supply housing and being disposed in engagement with said rotor, said rotor follower vane means defining a movable partition separating the space between said rotor and said housing into variable volume suction and compression chambers; means urging said follower vane means into engagement with said rotor at all times; and means establishing releasable connection of said gas supply mechanism to an electrically driven erasing machine and communicating said gas outlet passage with the gas passage of the erasing machine.

Claim 6

A gas supply mechanism for attachment to an electrically driven erasing machine, having a chuck mechanism receiving a strip of erasing material defining a gas passage for directing a flow of gaseous medium against the surface to be erased, said gas supply mechanism comprising: a gas supply housing having gas inlet means formed therein; a rotor shaft being supported for rotation within said gas supply hosuing and having a gas outlet passage defined therein; a rotor being eccentrically carried by said rotor shaft and being oscillatable within said gas supply housing upon rotation of said shaft; rotor follower vane means being carried within said gas supply housing and being disposed in engagement with said rotor, said rotor follower vane means defining a movable partition separating the space between said rotor and said housing into variable volume suction and compression chambers; means urging said follower vane means into engagement with said rotor at all times; and means establishing releasable connection of said gas supply mechanism to an electrically driven erasing machine and communicating said gas outlet passage with the gas passage of the erasing machine.

Claim 7

A gas supply mechanism as recited in claim 4: seal means carried by said rotor and being operative to prevent excessive leakage of gas past the extremities of said rotor.

Claim 8

A gas supply mechanism as recited in claim 5: means interposed between said housing and said rotor and preventing free rotation of said rotor relative to said housing.

Claim 9

A gas supply mechanism as recited in claim 4: said rotor shaft having a generally cylindrical surface eccentrically defined thereon; bearing means received by said cylindrical surface and rotatably supporting said rotor on said rotor shaft; said housing having a generally cylindrical wall defined therein; and said rotor having a generally cylindrical peripheral surface moving in close proximity with said cylindrical wall upon rotation of said rotor shaft.

Claim 10

A gas supply mechanism as recited in claim 7: a counterweight being carried by said rotor shaft and preventing vibration of said gas supply mechanism upon oscillation of said rotor within said housing.

Claim 11

A gas supply mechanism for attachment to an electrically energized erasing machine having a chuck tube being rotatably driven by the electric motor thereof, said chuck tube having a chuck mechanism at the lower extremity thereof for supporting a strip of erasing material, said chuck tube being accessable from the upper extremity of the erasing machine and defining a flow passage through the erasing machine, said gas supply mechanism comprising: housing means adapted to be disposed at the upper extremity of the erasing machine; a pump mechanism being disposed within said housing means and having suction and discharge apertures; connection means being provided on said pump mechanism and establishing driven connection with the chuck tube of said erasing machine; conduit means extending from said gas discharge aperture to said chuck tube and cooperating with said flow passage to define a gas flow passage terminating adjacent the lower extremity of said strip of erasing materiaL; and air being discharged from said conduit means under pressure generated by said pump mechanism upon energization of the motor of said erasing machine being directed by said conduit means at the area of contact between said strip of erasing material and the surface being erased, for cooling purposes and for blowing erasure particles away from said area of contact.

Claim 12

A gas supply mechanism for attachment to an electrically energized erasing machine having a chuck tube being rotatably driven by the electric motor thereof, said chuck tube having a chuck mechanism at the lower extremity thereof for supporting a strip of erasing material, said chuck tube being accessable from the upper extremity of the erasing machine and defining a flow passage through the erasing machine, said gas supply mechanism comprising: housing means adapted to be disposed at the upper extremity of the erasing machine; a pump mechanism being disposed within said housing means and having suction and discharge apertures; connection means being provided on said pump mechanism and establishing driven connection with the chuck tube of said erasing machine; conduit means extending from said gas discharge aperture to said chuck tube and cooperating with said flow passage to define a gas flow passage terminating adjacent the lower extremity of said strip of erasing materiaL; and air being discharged from said conduit means under pressure generated by said pump mechanism upon energization of the motor of said erasing machine being directed by said conduit means at the area of contact between said strip of erasing material and the surface being erased, for cooling purposes and for blowing erasure particles away from said area of contact.

Claim 13

A gas supply mechanism as recited in claim 9: said conduit means being defined by said connection means; and said gas being discharged in intermittent pulses by said pump mechanism.

Claim 14

A gas supply mechanism as recited in claim 9: said pump mechanism having a generally cylindrical chamber defined therein: a generally cylindrical rotor of smaller dimension than said chamber being disposed within said cylindrical chamber; shaft means being rotatably received within said housing and having an eccentric formed thereon, said eccentric establishing rotatable eccentric relation between said shaft means and said rotor means; said connection means being a connection extension provided on said shaft means and being adapted for releasable connection within said chuck tube of said erasing machine; and said conduit means including passage means formed in said connection extension for establishing fluid communication with the chuck tube of said erasing machine.