US3719437A

US3719437A - Piston pump for delivering viscous pastes

Info

Publication number: US3719437A
Application number: US00087866A
Authority: US
Inventors: S Schuhmann; H Alix
Original assignee: Roland Offsetmaschinenfabrik Faber and Schleicher AG
Current assignee: Roland Offsetmaschinenfabrik Faber and Schleicher AG
Priority date: 1969-11-15
Filing date: 1970-11-09
Publication date: 1973-03-06
Anticipated expiration: 1990-03-06
Also published as: CH519656A; FR2071860A5; GB1288365A; DE1957559B2; DE1957559A1; SE362120B; DE1957559C3

Abstract

A piston pump for delivering viscous fluids such as ink paste has an outlet valve in the form of a disc surrounding the pump piston rod and closing one end of the pump cylinder, the other end of the cylinder being open to form an inlet port when the piston projects beyond it at the end of the suction stroke. The outlet valve is closed by friction with the piston rod by a spring on the suction stroke and is opened by the pressure of fluid drawn into the cylinder on the working stroke. The valve and piston are quickly detachable from a drive mechanism comprising a motor and gearing which are suspended from a mounting movable vertically above a fluid container in which the pump is housed when working. The pump carries at its suction end a pressure plate which is a close sliding fit within the container wall or walls. Two or more pumps may be mounted on the same pressure plate.

Description

United States Patent [1 1 Schnhmann et a1.

[54] PISTON PUMP FOR DELIVERING VISCOUS PASTES [75] inventors: Siegfried Schuhmann; Hans Alix,

both of Offenback A.M., Germany [73] Assignee: Roland Offsetmaschinenfabrik Faber & Schleicher AG, Offenbach am Main, Germany [22] Filed: Nov. 9, 1970 [21] App]. No.: 87,866

[30] Foreign Application Priority Data Nov. 15, 1969 Germany ..P 19 57 559.8

[52] US. Cl. ..417/360, 417/454, 417/487 [51] Int. Cl ..F04b 17/09, F04!) 21/00, F0413 39/10 [58] Field of Search ..417/489, 454, 360, 451, 452; 222/385 [56] References Cited UNITED STATES PATENTS 593,885 11/1897 Greer ..417/61 2,403,122 7/1946 Reisert et al.. .....222/385 X 2,409,962 10/1946 Shearman ..417/489 X 2,420,151 5/1947 Renouf et a1. ..417/452 X [4 1 March 6, 1973 Campbell ..417/489 X Rotter ..417/489 X 5 7] ABSTRACT A piston pump for delivering viscous fluids such as ink paste has an outlet valve in the form of a disc surrounding the pump piston rod and closing one end of the pump cylinder, the other end of the cylinder being open to form an inlet port when the piston projects beyond it at the end of the suctionstroke. The outlet valve is closed by friction with the piston rod by a spring on the suction stroke and is opened by the pressure of fluid drawn into the cylinder on the working stroke. The valve and piston are quickly detachable from a drive mechanism comprising a motor and gearing which are suspended from a mounting movable vertically above a fluid container in which the pump is housed when working. The pump carries at its suction end a pressure plate which is a close sliding fit within the container wall or walls. Two or more pumps may be mounted on the same pressure plate.

6 Claims, 9 Drawing Figures PISTON PUMP FOR DELIVERING VISCOUS PASTES The invention relates to a single-acting piston pump for delivering viscous fluids such as pastes from a storage container to a consumer station, wherein the suction aperture of the pump is controlled by the delivery piston.

It is the object of the invention to provide a pump which is suitable, in particular, for delivering viscous offset printing inks from an ink container to the ink fountain of a printing press, and which is easy to service and can be rapidly cleaned.

A plunger pump for delivering milk or the like is already known through German Pat. specification No. 47578, wherein the pump housing and the plunger can be separated from one another and so the pump can be better cleaned. The pump contains a ball valve at the pressure side and is unsuiable for the delivery of viscous pastes. The accessibility, particularly to the ball valve, necessary for cleaning, is inadequate.

In the present invention the pump outlet is controlled by an outlet valve which is guided on the piston rod and can be positively urged into the closed position, and the piston rod extends through the cylinder cover closing the cylinder pressure chamber, and outlet valve, delivery piston and cylinder cover can be removed from the cylinder body. As a result of this arrangement, particularly rapid and simple dismantling and cleaning of the pump is possible. The dismantling is effected by means of a single manual operation. There are no dirt traps which need special cleaning, such as ball valves, in the arrangement according to the invention.

Preferably there are provided a rapid locking device by means of which the piston pump can be connected precisely to a drive unit, and a quick release coupling by means of which the piston rod can be coupled to the drive unit. This means is particularly advantageous when the parts of the pump soiled by the ink have to be cleaned individually, as may be advisable, for example, on a change of ink.

The cylinder cover can be connected to the cylinder by means of a bayonet locking device. This is a particularly rapid attachment which is simple to release.

In one form of the invention, the outlet valve is urged by a spring into the closed position and by paste displaced by the piston during the working stroke into the open position. An automatic valve of this kind is particularly simple and operationally reliable.

In another form of the invention, the outlet valve is urged into the closed position by friction occurring between outlet valve and piston rod during the suction of the piston, and into the open position by the paste displaced by the piston during the working stroke. With this arrangement, a spring is saved and so there is an advantage with regard to costs and maintenance. The provision of a helical spring in particular could render cleaning of the pump more difficult.

In a specific embodiment of the invention, the delivery pump emerges completely from the cylinder during the suction stroke. Thus there is a particularly favorable cross-section available for the materal flowing into the pump cylinder and this has a particularly favorable effect with a viscous offset printing ink.

In another embodiment of the invention, the piston comprises recesses extending in the axial direction of the piston at the circumference. At the end of the suction stroke, the piston only projects so far from the cylinder that the paste can flow into the interior of the cylinder through the recesses. The guiding of the piston in the cylinder is retained in this manner.

In another embodiment of the invention, the cylinder walls have slots extending in the axial direction. The piston also remains guided in the cylinder in this manner.

Preferably, the suction side of the pump is connected to a pressure plate, the cross-section of which is such that it just fits into the storage container. The pressure plate is preferably interchangeable in order to adapt the delivery pump for use for storage containers of different shapes.

A pressure plate is equipped with two or more pumps. This arrangement leads to a particularly compact form of construction which is easy to service and which can be used to particular advantage on perfecting presses, wherein both sides of a web of paper are printed with the same ink but the ink consumption differs.

Some exemplifying embodiments of the invention are illustrated diagrammatically in the accompanying drawings, in which:

FIG. I shows a piston pump according to the invention immersed in an ink can, partially in section;

FIG. 2 shows a side view of the device shown in FIG.

FIG. 3 is an enlarged detail from FIG. 1, and shows the cylinder body of the pump according to one embodiment;

FIG. 4 shows the same details in FIG. 3 but seen from another direction;

FIG. 5 shows another embodiment of the delivery piston;

FIG. 6 shows a plan view of the piston shown in FIG. 5;

FIG. 7 shows a section through a specially constructed cylinder body in a further embodiment;

FIG. 8 shows a section on the line VIII-VIII in FIG. 7; and

FIG. 9 shows an elevational view of two piston pumps of the type shown in FIG. 1.

A piston pump 1 is connected to a drive unit, consisting of an electric motor 3 and a gear 4, by means of a snap closure 2. The rapid-locking device 2 consits of a quick adjusting screw 5 and fitting pins 6,7. The gear 4 is a crank gear which converts the rotary motion of the electric motor 3 into a reciprocating motion of a connecting rod 8. The connecting rod 8 can be connected to a piston rod 10 of the piston pump 1 by means of a quick-release coupling 9. As shown in FIG. 4, the quick-release coupling 9 consists of a pin 11 which is secured against falling out by means of a resilient safety plate 12. The piston rod 10 is reciprocated in a cylinder 13. An outlet valve 14 is constructed in the form of an annular disc and is guided on the piston rod 10 with the interposition of a seal 15. During the downward movement of the piston rod 10, the valve 14 is restrained by friction and urged against a valve seat 16. For this it is necessary for the piston stroke h to be greater than the distance v covered by the valve 14. When the piston 17 emerges from the cylinder 13 the position shown in FIGS. 3 and 4 in broken lines the pasty but flowable material to be pumped flows into the cylinder 13. During the upward movement of the piston 17, the outlet valve 14 is automatically urged away and the material is pumped into a pressure line 18 leading to a consumer station or point of utilization (see FIG. 1).

The storage container to be pumped empty, here an ink can 19, is placed on the lower plate 20 of a frame 21. A pressure plate 23 is secured to a flange 22 mounted at the suction side of the pump 1. The pressure plate 23 just fits into the ink can 19 with the interposition of a sealing ring 24 so that the whole unit consisting of pump 1, gear 4 and motor-3 inserted into the ink can 19 is gradually lowered as the ink level drops, the wall of the can being scraped clean of ink by the sealing ring 24. The vent valve 25 facilitates removal of the

unit

1, 3, 4. The unit consisting of gear 4,motor 3 and pump 1 is connected to a crossbar 26 at each end of which there is mounted a pair of

rollers

27, 28 and 29, 30. One

roller

28, 30 of each pair of rollers is mounted directly at an

end

31, 32 respectively of the crossbar 26, while the

other roller

27, 29 of each pair of rollers is mounted on an

arm

33, 34 secured to the crossbar 26. Each pair of rollers is guided in a groovelike guide provided in a longitudinal bar 35 36 of the stand. The entire arrangement can be suspended from a hook 38 mounted on a further crossbar 37 of the stand. In this suspended position, the pump 1 can be disconnected from the gear 4 by releasing the quickrelease coupling 9 and the rapid-locking device 2.

The piston rod is guided by the cylinder cover 39 and sealed off from the cylinder compartment by a seal 40. The cylinder cover 39 is secured to the cylinder body 41 by means of a known bayonet locking device which can be rapidly released. A pin 42 which is secured to the cylinder body 41 is inserted into a longitudinal groove 43 provided in the cover 39 when the cylinder cover 39 is placed in position and enters an annular groove 44 provided in the cover 39 when the cover 39 is turned (F168. 3 and 4). A further resilient seal 45 is mounted between the cylinder body 41 and the cover 39 (FIGS. 3 and 4).

FIGS. 5 and 6 show another embodiment of the piston 17 of the piston pump 1. The piston 17 comprises, at its circumference, recesses 46 through which the material to be pumped can pass when the piston 17 has travelled partially out of the cylinder 13. As a result, the piston 17 remains constantly guided in the cylinder 13 by webs 47. The outlet valve 14 is here urged against the valve seat 16 by a spring 48.

FIGS. 7 and 8 show a further embodiment of a cylinder 13 of the piston pump 1. The cylinder 13 comprises slots 49 at its circumference so that the material to be pumped can enter even when the piston 17 has not been driven out of the cylinder 13. Here, too, constant guiding of the piston is obtained by raised portions 50.

Finally, FIG. 9 shows two pumps and the components associated therewith mounted on pressure plate 23.The reference numerals applied to the second pump are the same as used for the first pump but primed. Both pumps serve to pump the material out of supply can 19.

What is claimed'is:

l. A pumping device for pumping viscous fluid from a storage container to a point of utilization, said pumping device comprising in combination:

an open storage container for the fluid to be pumped;

a cylinder having at one end a detachable cover and being open at the other end, said open end being disposed to extend into the storage container and constituting the intake side of the pumping device;

a piston slidable in the cylinder between a lower limit position and an upper limit position;

a piston rod mounting said piston and slidably extended through the cover of the cylinder;

drivemeans coupled to the piston rod for imparting to the same and thus to the piston a reciprocating movement;

conduit connected to the cylinder for delivering fluid to the point of utilization;

a valve means for opening and closing the connection between the cylinder and the conduit, said valve means being controlled by the up and down movements of the piston so as to close said connection by the downward movement of the piston and to open said connection by the upward movement of the piston;

a quick-release fastening means releasably securing the cover to the cylinder for quick withdrawal of the cover, the piston rod with the piston thereon and the valve means from the cylinder upon release of said fastening means;

a quick-release fastening means releasably securing the piston rod to the drive means; and

quick-release fastening means releasably securing the cylinder to the drive means.

2. A pumping device for pumping viscous fluid from a storage container to a point of utilization, said pumping device comprising in combination:

an open storage container for the fluid to be pumped;

drive means coupled to the piston rod for imparting to the same and thus to the piston a reciprocating movement; I

a conduit connected to the cylinder for delivering fluid to the point of utilization;

said valve means including a valve seat formed within the cylinder intermediate the length thereof and a valve disc slidably seated on the piston rod with a friction fit, movement of the piston toward its lower limit position causing said disc to be moved into sealing engagement with said seat thereby closing the valve means but permitting further downward movement of the piston, said closing of the valve 'means interrupting the connection between the cylinder and the conduit, upward movement of the piston toward its upper limit position lifting the disc clear of the valve seat thereby opening the valve means; and

3 ,7 1 9 ,43 7 5 6 a quick-release fastening means releasably securing 4. The pumping device according to claim 1 wherein the cover to the cylinder fo qui k th a of said quick-release fastening means comprises a bayonet the cover, the piston rod with the piston thereon lock means on the cylinder and the cover.

and the Valve means from the cylinder upon 5. The pumping device according to claim 1 wherein release of sfiid fasfiening 5 said piston has in its circumference at least one recess 3. The pumping device according to claim 1 wherein extending through the thickness f the piston plston m Its lower 1mm PPSmOn 18 below the.open 6. The pumping device according to claim 1 wherein cylinder end thereby uncovering the cylinder for influx the cylinder has within the range of the piston moveof fluid from the container into the cylinder, movement of the piston toward its upper limit position and thus 10 g at least one anally elongate recess m Inner opening of the valve means delivering fluid within the w cylinder space above the piston to said conduit.

Claims

1. A pumping device for pumping viscous fluid from a storage container to a point of utilization, said pumping device comprising in combination: an open storage container for the fluid to be pumped; a cylinder having at one end a detachable cover and being open at the other end, said open end being disposed to extend into the storage container and constituting the intake side of the pumping device; a piston slidable in the cylinder between a lower limit position and an upper limit position; a piston rod mounting said piston and slidably extended through the cover of the cylinder; drive means coupled to the piston rod for imparting to the same and thus to the piston a reciprocating movement; a conduit connected to the cylinder for delivering fluid to the point of utilization; a valve means for opening and closing the connection between the cylinder and the conduit, said valve means being controlled by the up and down movements of the piston so as to close said connection by the downward movement of the piston and to open said connection by the upward movement of the piston; a quick-release fastening means releasably securing the cover to the cylinder for quick withdrawal of the cover, the piston rod with the piston thereon and the valve means from the cylinder upon release of said fastening means; a quick-release fastening means releasably securing the piston rod to the drive means; and quick-release fastening means releasably securing the cylinder to the drive means.

2. A pumping device for pumping viscous fluid from a storage container to a point of utilization, said pumping device comprising in combination: an open storage container for the fluid to be pumped; a cylinder having at one end a detachable cover and being open at the other end, said open end being disposed to extend into the storage container and constituting the intake side of the pumping device; a piston slidable in the cylinder between a lower limit position and an upper limit position; a piston rod mounting said piston and slidably extended through the cover of the cylinder; drive means coupled to the piston rod for imparting to the same and thus to the piston a reciprocating movement; a conduit connected to the cylinder for delivering fluid to the point of utilization; a valve means for opening and closing the connection between the cylinder and the conduit, said valve means being controlled by the up and down movements of the piston so as to close said connection by the downward movement of the piston and to open said connection by the upward movement of the piston; said valve means including a valve seat formed within the cylinder intermediate the length thereof and a valve disc slidably seated on the piston rod with a friction fit, movement of the piston toward its lower limit position causing said disc to be moved into sealing engagement with said seat thereby closing the valve means but permitting further downward movement of the piston, said closing of the valve means interrupting the connection between the cylinder and the conduit, upward movement of the piston toward its upper limit position lifting the disc clear of the valve seat thereby opening the valve means; and a quick-release fastening means releasably securing the cover to the cylinder for quick withdrawal of the cover, the piston rod with the piston thereon and the valve means from the cylinder upon release of said fastening means.

3. The pumping device according to claim 1 wherein the piston in its lower limit position is below the open cylinder end thereby uncovering the cylinder for influx of fluid from the container into the cylinder, movement of the piston toward its upper limit position and thus opening of the valve means delivering fluid within the cylinder space above the piston to said conduit.

4. The pumping device according to claim 1 wherein said quick-release fastening means comprises a bayonet lock means on the cylinder and the cover.

5. The pumping device according to claim 1 wherein said piston has in its circumference at least one recess extending through the thickness of the piston.