referring to fig1 a rotary milking platform ( 1 ), of known type , including a number of stalls ( 2 ) mounted on a moving platform ( 3 ). a cow ( 4 ) is shown in a first stall ( 5 ) and an automatic teat sprayer ( 6 ) is shown mounted on a non moving part of the rotary milking platform ( 1 ). the automatic teat sprayer ( 6 ) could equally be mounted on a stationary surface alongside the milking platform ( 1 ). it should be noted that though the term cow ( 4 ) is used herein it is intended to cover any animal that is similarly milked ; for example goats , sheep , water buffalo , horses , camels , reindeer , moose , etc , where this milking occurs ( or could occur ) on a moving platform ( 3 ). referring to fig2 the automatic teat sprayer ( 6 ) including a spray unit ( 7 ) and housing ( 8 ) is shown . the housing ( 8 ) supports and locates the spray unit ( 7 ) at the correct vertical and horizontal location . the housing ( 8 ) includes means ( not shown ) of known type to adjust the vertical and horizontal position of the spray unit ( 7 ) ready for use . in this embodiment the housing ( 8 ) is releasably , but rigidly , fixed to a non moving part of the milking platform ( 1 ) or stationary surface alongside the milking platform ( 1 ). referring to fig3 to 5 the spray unit ( 7 ) including a spray head ( 10 ), flexible section ( 11 ), extending section ( 12 ) and mounting section ( 13 ) is shown separated from the housing ( 8 ). the spray head ( 10 ) is connected to a first end ( 15 ) of the flexible section ( 11 ) which , by a second end ( 16 ), is connected to a primary end ( 17 ) of the extending section ( 12 ). the first and second ends ( 15 , 16 ) are opposite ends of the flexible section ( 11 ). the extending section ( 12 ) includes a secondary end ( 18 ) such that the primary and secondary ends ( 17 , 18 ) are the distal ends of the extending section ( 12 ). the flexible section ( 11 ) is a coil spring of known type , is rigid and strong enough to support and locate the spray head ( 10 ), but resilient enough to deflect if hit by the cow , ( 4 ) or part of the milking platform ( 1 ), without significant damage to either . the mounting section ( 13 ) includes two separated bushes ( 20 , 21 ), a casing ( 22 ) and an extension means ( 23 ). the bushes ( 20 , 21 ) and extension means ( 23 ) are inside the casing ( 22 ), which is a hollow prism . each bush ( 20 , 21 ) is a hollow prism attached to an inner surface ( 25 ) of the casing ( 22 ). each bush ( 20 , 21 ) includes an aperture ( 26 ) dimensioned to be a sliding fit with the extending section ( 12 ). the bushes ( 20 , 21 ) casing ( 22 ) and extending section ( 12 ) have coincident centrelines . the extension means ( 23 ) includes a fixed section ( 30 ), an extender ( 31 ) and a connector ( 32 ). the connector ( 32 ) is attached to an inner surface ( 33 ) of the extending section ( 12 ), and the fixed section ( 30 ) is connected to the mounting section ( 13 ) by known means . the extension means ( 23 ) for this embodiment is a hydraulic or pneumatic ram , with the fixed section ( 30 ) being the barrel , and the extender ( 31 ) being the piston . the mounting section ( 13 ) is attached to the housing ( b ) by known means , for example rigid or flexible fixings such as nuts and bolts , welds , rubber bushes , pins , clamps etc . the spray unit ( 7 ) also includes a flexible pipe ( 35 ) which runs along the inside of the spray unit ( 7 ) and connects the spray head ( 10 ) to a feed tank ( not shown ). the feed tank contains a fluid to be sprayed onto the cow &# 39 ; s ( 4 ) udder or teats . the spray head ( 10 ) includes a spray nozzle ( 40 ) and mounting block ( 41 ). the spray nozzle ( 40 ) is attached to the mounting block ( 41 ), and is adapted to deliver the fluid from the feed tank to the cow &# 39 ; s ( 4 ) udder or teats . referring to fig6 and 7 a preferred means of operation is shown . the cow ( 4 ) being carried around by the moving platform ( 3 ) arrives at the teat spraying station . the moving platform ( 3 ) includes leg spreaders ( 48 ) which due to their dimensions and shape force the hind legs of the cow ( 4 ) to be spread apart . the automatic teat sprayer ( 6 ) detects the arrival of the cow ( 4 ), or the first stall ( 5 ), and extends the extending section ( 12 ) from a rest position to an extended position . the fluid is sprayed onto the cow &# 39 ; s ( 4 ) teats through the spray nozzle ( 40 ) during its movement from its resting position through to its extended position and back to its rest position . the first stall continues moving to bring the next stall ( 2 ) into line , noting that the movement of the stall is not controlled by the automatic teat sprayer ( 6 ). in use the spray head ( 10 ) passes beyond the hind legs of the cow ( 4 ). the spray nozzle ( 40 ) directs the spray between the hind legs and onto the teats of the cow ( 4 ). referring to fig8 a control system ( 49 ) including a control unit ( 50 ), sensors ( 51 , 52 , 53 ), input / control lines ( 54 , 55 ) to / from the spray unit ( 7 ) and inputs ( 56 , 57 ) from the milking platform ( 1 ) are shown . the sensors ( 51 , 52 , 53 ) are sensors of a known type and could include sensors such as infra red / ultrasonic / microwave or pressure sensors which detect the location of the cow ( 4 ), position sensors such as reed switches ( or similar magnetic switches )/ micro switches / pressure sensors / switches or optical sensors that detect or report the position of the stall or cow , photographic or video sensor to locate the cow ( 4 ) or similar . the input / control lines ( 54 , 55 ) from the spray unit transfer information such as the position of the spray head ( 10 ), the level of fluid in the feed tank , the pressure in any hydraulic lines , the pressure of the fluid in the flexible pipe ( 35 ) and / or control information to the extension means ( 23 ) and feed tank pump / valves ( not shown ). the inputs ( 56 , 57 ) from the milking platform ( 1 ) can include an indexing signal that indicates the position of the stall , a stall occupancy indication and a leg spreader ( 48 ) indication ( i . e . an indication if the cows ( 4 ) legs are wide enough apart for spraying to occur ). in use the control unit ( 50 ) receives a signal from one or more of the sensors ( 51 , 52 , 53 ) and determines there is an animal in the stall . the control unit then extends the extending section ( 12 ) from the rest position to the extended position and back to the rest position as the animal moves past . as the extending section ( 12 ) extends one or more of the sensors ( 51 , 52 , 53 ) detects the point at which spraying should commence , the first trigger position , and sends a signal to the control unit ( 50 ) which initiates the fluid flow to the spray nozzle ( 40 ). the extending section ( 12 ) continues to move to the extended position , spraying the animals teats , then returns . on the return stroke of the extending section ( 12 ) one or more of the sensors ( 51 , 52 , 53 ) detects a point at which spraying should stop , the second trigger point and sends a signal to the control unit ( 50 ) which then shuts off the fluid flow to the spray nozzle ( 40 ) and stops spraying the teats . the extending section ( 12 ) continues moving until it has returned to the rest ( retracted ) position ready for the next occupied stall . in an alternative embodiment , in use the spray head ( 10 ) does not pass beyond the hind legs of the cow ( 4 ) and the fluid is sprayed onto the teats of the cow ( 4 ) on both the movement to its extended position and its movement back to the rest position . this minimises the likelihood of damaging the cow ( 4 ) if the spray cycle is mistimed . in an alternative embodiment the housing ( 8 ) is rigidly , and semi - permanently or permanently fixed to a stationary surface on or away from the milking platform ( 1 ). in an alternative embodiment ( not shown ) the bushes ( 20 , 21 ) are part of the outer surface of the casing ( 22 ) and an inner surface of the extending section ( 12 ) is dimensioned and configured to slidingly engage with an outer surface of the bushes ( 20 , 21 ). in an alternative embodiment the flexible section ( 11 ) is a strip of resilient material , thick walled tube of resilient material or similar . in an alternative embodiment the movement of the milking platform ( 1 ) is timed wholly , or in part by the automatic teat sprayer ( 6 ). in an alternative embodiment sensors ( 51 , 52 , 53 ) determine the height of the udders and teats and adjust the vertical plane of the spray head ( 10 ) accordingly . in an additional embodiment at least one sensor ( 51 , 52 , 53 ) determines the position of the animal ( 4 ) and the control unit ( 5 ) adjusts the path of the spray head ( 10 ) for optimum coverage . aspects of the present invention have been described by way of example only and it should be appreciated that modifications and additions may be made thereto without departing from the scope of the appended claims .
a fluid delivery device is provided for applying fluid to an object , including a spray head , a fluid conduit connected to the spray head , and a driver for moving the spray head into a spray position relative to the object , wherein the spray head includes a support arm , the support arm including at least a flexible section , an actuator to cause fluid to be sprayed via the spray head , and a control mechanism that ensures that a ) the spray head is moved by the driver substantially to an area of the object to be sprayed , b ) the fluid is supplied to the spray head once the spray head is in position , and the fluid device actuated , and c ) the spray head is withdrawn from position after spray has been supplied to the object .