Patent GB-723432-A (GB)
Title: Improvements in or relating to apparatus for treating with liquid a body having irregular surfaces
IPC: B05B13/02
Filed: 1952-11-14
Abstract: <PICT:0723432/III/1> An apparatus for treating with liquid a body having irregular surfaces, comprises a conveyer movable past a liquid projecting device, and having a support on which a body can be mounted for rotation about a substantially longitudinal axis thereof, and means for rotating the body as it passes the liquid projecting device, the operation of which is controlled by mechanism including a set of rotatably mounted cams in fixed axially spaced relation, each cam being provided for controlling a function of the liquid projecting device, a set of cam followers spaced to respectively engage the cams and connected to effect control of the liquid projecting device, means for rotating the cams as the body support is conveyed past the said device, actuating means to effect relative axial movement between the cams and the followers to effect co-operation or otherwise therebetween, control means connected to the actuating means, and settable operating means movable with a body support for co-operation with the control means to control actuation of the actuating means.  For treating bodies of more than one kind, two or more sets of cams may be provided, in fixed axially spaced relation, with a single set of cam followers, and actuating means to effect relative movement between the sets of cams and the set of cam followers along the axis of rotation of the cams, to effect co-operation or otherwise between them, the actuating means being controlled by means which co-operate with a settable operating means movable with a body support.  As shown, car bodies of two differing types, B1 and B2, are secured to cradles 1 which are supported for rotation at the treating position, on stub spindles 5 carried on outriggers 2, which are moved along a mono-rail conveyer 3 by a chain 4, past four stations.  At station I, it is determined whether or not a cradle is in the correct position by a normally-closed switch 24 and a normally-open switch 26 which are respectively adapted to be opened and closed by an abutment 23 on the outrigger 2 and a skid plate 25 on the cradle 1, the two switches being connected in parallel with each other and in series with the no-volt control circuit 27 of the motor driving the conveyer 4, so that if both switches open simultaneously, the conveyer is topped.  At station II there is provided a light projector 28, controlled by a normally-open switch 38, which is operated by engagement with the skid plate 25, the arrangement being such that if a body B1 is supported on the cradle 1, a beam of light <PICT:0723432/III/2> <PICT:0723432/III/3> is projected through the window-openings thereof and falls on a photo-electric cell 29, but if the body is of type B2, the cell is obturated from the beam.  The cell 29 is connected to an amplifier 30 which causes an electromagnet 33, or alternatively a relay controlling an electropneumatic valve, to be energized only if the body is of B1 type, when a setting lever 35, connected to the armature of the electromagnet is raised.  A spring-loaded, self-sustaining operating lever 21 is supported on a bracket on the outrigger 2, and if the forward end of this lever is set downward, indicating that the body last carried was a B2 type, whereas the body now carried is a B1, so that the electromagnet 33 is energized, the lever 35 contacts a roller 138 on the lever 21 and sets the forward end of the latter to the upper position. The cradle now passes to station III where the lever 21 cooperates with a self-sustaining cam setting lever 39 supported on the conveyer rail 3 and connected to a pneumatic rotary slide valve 41 which controls the admission of air to a cylinder 48 on one or the other side of the piston 49, the rod 50 of which carries a fork engaging a groove in a cam drum on which are provided cams GC1, GC2, PC1, GC12, GC22 and PC2.  According to the up or down positions of the lever 21, corresponding to the presence of bodies of types B1 or B2, the piston 49 is operated to bring the cams GC1, GC2 and PC1 or GC12, GC22 and PC2 into cooperation with followers 18, 19 and 20 controlling the operation of the spray gun 8, which is movable as described in Specification 652,720.  A position is provided between stations II and III for performing manual operations, a duplicate set of detector apparatus being provided to ensure that the cradles are left in the correct positions.  The apparatus can be arranged to accommodate more than two types of body, e.g. four types, by providing four sets of cams, and doubling the number of setting levers 35, electromagnets 33, light projectors 28, cells 29 and operating levers 21, and by controlling the position of the piston rod 50 by a double impulse cylinder 52 (Fig. 6), the positions of the pistons 53, 54 of which are controlled by valves 41a, 41 operated by the two setting levers whereby four positions of the cam drum may be obtained. Alternatively there may be three sets of cams, for three body types, and provision may be made for rendering these ineffective if no body is present. The Provisional Specification describes the application of the invention to a greater number of body types.  The setting of operating levers 21 may be effected by the setting levers 35 being manually operated as by a switch or hand-operated lever, and the detector devices, light projector 28, cell 29 and amplifier 30 may then be dispensed with.