Paint replenishing system for cartridge
A quantitation setup mechanism ( 58 ) is composed of a piston ( 62 ) which is incorporated into a quantitation tank ( 61 ) to define therein a metering chamber ( 63 ), a quantitation setup portion ( 65 ) for presetting a quantity of paint replenishment, and a sensor ( 66 ) adapted to detect a displacement of the piston ( 62 ) preset by the quantitation setup portion ( 65 ). In this instance, paint is replenished into a paint chamber ( 19 ) of a cartridge ( 16 ) by means of a paint feed mechanism ( 32 ). In the course of the paint replenishment, an equivalent amount of an extruding liquid is displaced and discharged from an extruding liquid chamber ( 20 ). The displaced extruding liquid is introduced into the metering chamber ( 63 ) of the quantitation setup mechanism ( 58 ), detecting a quantity of displacement of the extruding liquid by replenished paint by the sensor ( 66 ) through the piston ( 62 ) to exactly quantitate the paint replenishment.
1. A paint replenishing system for a cartridge composed of:
a paint feed means ( 32 ) for feeding paint to a cartridge ( 16 ) which is defined to a paint chamber ( 19 ) and an extruding liquid chamber ( 20 ) by a partition wall ( 18 ), and
an extruding liquid feed means ( 54 ) adapted to push out residual paint from said paint chamber ( 19 ) by feeding an extruding liquid to said extruding liquid chamber ( 20 ) of said cartridge ( 16 ), characterized in that said paint replenishing system for a cartridge comprises:
a quantitation setup means ( 58 , 71 ) for presetting a quantity of paint to be replenished into said paint chamber ( 19 ) of said cartridge ( 16 ) according to a preset target quantitation value, and stopping paint replenishment by said paint feed means ( 32 ) as soon as discharges of an extruding liquid from said extruding liquid chamber ( 20 ) reaches a preset target quantitation value by a replenished paint of said paint chamber ( 19 ) by said paint feed means ( 32 ); and
said quantitation setup means ( 58 , 71 ) comprised of a quantitation tank ( 61 , 72 ), an extruding liquid line change-over valve ( 60 ) for selectively connecting said extruding liquid chamber ( 20 ) of said cartridge ( 16 ) with either an extruding liquid feed means ( 54 ) or said quantitation tank ( 61 , 72 ), a movable partition wall ( 62 ) incorporated into said quantitation tank ( 61 , 72 ) to define therein a metering chamber ( 63 ) having an inner volume varying in proportion to a quantity of said extruding liquid introduced into said metering chamber ( 63 ) from said extruding liquid chamber ( 20 ) of said cartridge ( 16 ), a quantitation setup portion ( 65 ) for presetting a quantity of paint replenishment to said extruding liquid chamber ( 20 ) of said cartridge ( 16 ), and a sensor ( 66 ) adapted to output a replenishment stop signal as soon as said movable partition wall ( 62 ) is displaced to a predetermined position preset by said quantitation setup portion ( 65 ).
2. A paint replenishing system for a cartridge as defined in claim 1 , wherein said paint feed means ( 32 ) is adapted to stop a quantitative paint replenishment in response to a replenishment stop signal output by said sensor ( 66 ).
3. A paint replenishing system for a cartridge as defined in claim 1 , wherein said quantitation setup portion ( 65 ) is adapted to squeeze residues of said extruding liquid out of said metering chamber ( 63 ) by pushing said movable partition wall ( 62 ) as far as an initial position, reducing inner space of said metering chamber ( 63 ) to a minimum volume.
4. A paint replenishing system for a cartridge as defined in claim 1 , wherein a metering chamber ( 63 ) and an air chamber ( 73 ) are defined in said quantitation tank ( 72 ) by said movable partition wall ( 62 ), said air chamber ( 73 ) of said quantitation tank ( 72 ) being connected to an air valve ( 74 ) thereby to push said partition wall ( 62 ) as far as an initial position, reducing inner space of said metering chamber ( 63 ) to a minimum volume.
5. A paint replenishing system for a cartridge as defined in claim 1 , wherein an initial position sensor ( 67 ) is provided in said quantitation tank ( 61 , 72 ) to detect location of said movable partition wall ( 62 ) at an initial position after pushing inner space of said metering chamber ( 63 ) to a minimum volume.
6. A paint replenishing system for a cartridge as defined in claim 1 , wherein said paint feed means ( 32 ) is comprised of a replenishing stool ( 33 ) for mounting a cartridge ( 16 ), a color change valve device ( 49 , 82 ) connected to said replenishing stool ( 33 ) to supply paint and wash fluids to said cartridge ( 16 ), and a paint feed valve ( 43 , 81 ) connected between said replenishing stool ( 33 ) and said color change valve device ( 49 , 82 ) to turn on and off a paint supply from said color change valve device ( 49 , 82 );
said quantitation setup means ( 58 , 71 ) being adapted to output a replenishment stop signal as soon as discharges of an extruding liquid from said extruding liquid chamber ( 20 ) of said cartridge ( 16 ) reach a preset quantitation value; and
said paint feed means ( 32 ) being adapted to end a quantitative paint replenishment by stopping a paint supply from said paint feed valve ( 43 , 81 ) and/or said color change valve device ( 49 , 82 ) to complete a quantitative replenishment as soon as a replenishment stop signal is output by said quantitation setup means ( 58 , 71 ).
7. A paint replenishing system for a cartridge as defined in claim 1 , wherein said paint feed means ( 32 ) is comprised of a replenishing stool ( 33 ) for mounting said cartridge ( 16 ), a color change valve device ( 49 , 82 ) connected to said replenishing stool ( 33 ) to supply paint and wash fluids to said cartridge ( 16 ), and a paint feed valve ( 43 , 81 ) connected between said replenishing stool ( 33 ) and said color change valve device ( 49 , 82 ) to turn on and off a paint supply from said color change valve device ( 49 , 82 );
said extruding liquid feed means ( 54 ) being comprised of an extruding liquid source ( 57 ) holding a stock of extruding liquid, an extruding liquid line ( 55 ) connected between said extruding liquid source ( 57 ) and said replenishing stool ( 33 ), and a pump ( 56 ) provided in said extruding liquid line ( 55 );
said quantitation setup means ( 58 , 71 ) having said extruding liquid line change-over valve ( 60 ) provided in said extruding liquid line ( 55 ) at a position between said replenishing stool ( 33 ) and said pump ( 56 ); and
said extruding liquid line change-over valve ( 60 ) being comprised of a feed valve ( 60 A) for establishing and blocking communication between said extruding liquid chamber ( 20 ) of said cartridge ( 16 ) and said pump ( 56 ), and a return valve ( 60 B) for establishing and blocking communication between said extruding liquid chamber ( 20 ) of said cartridge ( 16 ) and said metering chamber ( 63 ) of said quantitation tank ( 61 , 72 ).
8. A paint replenishing system for a cartridge as defined in claim 7 , wherein said paint feed means ( 32 ) is adapted to end a quantitative paint replenishment by stopping a paint supply from said paint feed valve ( 43 , 81 ) and/or said color change valve device ( 49 , 82 ) in response to a replenishment stop signal output by said sensor ( 66 ) of said quantitation setup means ( 58 , 71 ).
9. A paint replenishing system for a cartridge as defined in claim 7 , wherein said quantitation setup means ( 58 , 71 ) further comprises a drain valve ( 68 ) which being closed when an extruding liquid is introduced into said metering chamber ( 63 ) of said quantitation tank ( 61 , 72 ) and opened when draining said extruding liquid from said metering chamber ( 63 ).