Inking pump mechanisms for printing machines

Claim 2

A metering pump for a printing press liquid feed mechanism including a body defining a chamber, an inlet and an outlet port communicating with the chamber, a piston guide formation opening into the chamber, and a valve guide formation parallel to said piston guide formation and intersecting both said ports, both said formations extending from one end of the body; a piston member in sliding engagement with the piston guide formation for reciprocating movement in pumping strokes inwardly of the body whereby the free volume of the chamber is decreased alternating with suction strokes outwardly of the body whereby said volume is increased; a slide valve member in sliding engagement with the valve guide formation for reciprocating movement inwardly and outwardly of the body and shaped to open and close one of said ports while closing and opening the other said port; resilient means urging each said member outwardly of the body; drive means including rotatably driveable piston and valve cams adjacent to said one end of the body for operatively engaging respective piston and valve cam followers on outer ends of the piston and valve members to cause reciprocating motion of the latter members in a predetermined operating cycle in which the inlet port is opened during at least part of the suction stroke and the outlet port is opened during at least part of the pumping stroke; adjustable stop means disposed for abutment with the piston cam follower to limit outward travel thereof and so determine the length of said pumping stroke; and keeper means attached to the body and selectively engageable with said cam followers to hold them clear of said cams with said members at inward positions for rendering the pump inoperative.

Claim 3

A pump according to claim 1 wherein said resilient means includes compression springs located in respective bores in the body parallel to the guide formations and acting on plungers carrier by the cam followers slidingly engaged in said bores, which plungers also serve to present rotation of the cam followers and attached piston and valve members relative to the body.

Claim 4

A pump according to claim 2, wherein the keeper means comprises a pair of bars located in the body for longitudinal movement in paths intersecting said bores for selective engagement with a notch in each plunger to hold the associated cam follower and member in the inward position.

Claim 5

A pump according to claim 1, wherein the keeper means includes a guide plate defining respective slots parallel to but spaced from the piston and valve members with which end parts of the cam followers are in sliding engagement, said plate being mounted on the body by means permitting selective movement in the direction of inward movement of the cam followers to a position at which the latter are held clear of the cams at said inward positions by abutment of said followers with end parts of said slots.

Claim 6

A metering pump for a printing press liquid feed mechanism including a body having first and second parallel bores extending from one end thereof, the first bore serving as a valve guide formation, a major part of the second bore extending from said body end serving as a piston guide formation, and a blind inner end part of the latter bore constituting a chamber; inlet and outlet port means including an inlet duct within the body open to a first part of said first bore, an outlet duct within the body open to a second part of said bore axially spaced from the first part, and inlet and outlet transfer passages leading into the chamber from respective sections of the first bore between but axially separated from thE inlet and outlet ducts, which passages are defined as spaced parts of a transverse blind bore in the body on an axis in a plane normal to and extending between the axes of the first and second bores and of a diameter sufficient to intersect both the latter bores, said spaced passage parts being separated by a shaped plug removably received in said transverse bore; a piston member in sliding engagement with said piston guide formation for reciprocating movement in pumping strokes inwardly of the body whereby the free volume of the chamber is decreased alternating with suction strokes outwardly of the body whereby said volume is increased; a slide valve member in sliding engagement with the valve guide formation for movement inwardly and outwardly of the body and shaped to place the inlet duct in communication with the inlet transfer passage while preventing communication between the outlet transfer passage and the outlet duct and to place the latter passage in communication with the latter duct while preventing communication between the inlet duct and the inlet passage; and drive means including rotatably driveable piston and valve cams engageable with respective cam followers to cause reciprocating motion of the piston and valve members in a predetermined operating cycle in which the inlet port means is open during at least part of said suction stroke and the outlet port means is open during at least part of the pumping stroke.

Claim 7

A metering pump for a printing press liquid feed mechanism including a body having first and second parallel bores extending from one end thereof, the first bore serving as a valve guide formation, a major part of the second bore extending from said body end serving as a piston guide formation, and a blind inner end part of the latter bore constituting a chamber; inlet and outlet port means including an inlet duct within the body open to a first part of said first bore, an outlet duct within the body open to a second part of said bore axially spaced from the first part, and inlet and outlet transfer passages leading into the chamber from respective sections of the first bore between but axially separated from thE inlet and outlet ducts, which passages are defined as spaced parts of a transverse blind bore in the body on an axis in a plane normal to and extending between the axes of the first and second bores and of a diameter sufficient to intersect both the latter bores, said spaced passage parts being separated by a shaped plug removably received in said transverse bore; a piston member in sliding engagement with said piston guide formation for reciprocating movement in pumping strokes inwardly of the body whereby the free volume of the chamber is decreased alternating with suction strokes outwardly of the body whereby said volume is increased; a slide valve member in sliding engagement with the valve guide formation for movement inwardly and outwardly of the body and shaped to place the inlet duct in communication with the inlet transfer passage while preventing communication between the outlet transfer passage and the outlet duct and to place the latter passage in communication with the latter duct while preventing communication between the inlet duct and the inlet passage; and drive means including rotatably driveable piston and valve cams engageable with respective cam followers to cause reciprocating motion of the piston and valve members in a predetermined operating cycle in which the inlet port means is open during at least part of said suction stroke and the outlet port means is open during at least part of the pumping stroke.

Claim 8

A pump according to claim 5, wherein the valve member is a cylindrical rod including axially spaced portions of reduced cross-section serving to provide the sequential opening and closing of the inlet and outlet port means respectively during said reciprocating movement.

Claim 9

A pump according to claim 5, wherein said portions are part cylindrical in cross-section, the cam follower associated with the slide valve member is fixedly mounted on the outer end of the latter, and further including means guiding said cam follower for reciprocal motion while preventing rotation of the slide valve member within the valve guide formation.