Printing press ink fountain key position adjustment according to the present invention is roughly classified into a home position correction system/method, an opening ratio correction system/method, and a target position correction system/method. The principles of these systems will be described first.
In a system shown in
The temperature detector 10 need only detect the temperature of the frame 9 near the ink fountain roller 3 or ink fountain key 4. Hence, the temperature detector 10 may exist at a frame position near the ink fountain roller 3 or at a frame position near the ink fountain key 4. The temperature detector 10 may be located at an intermediate position between the ink fountain roller 3 and the ink fountain key 4.
The ink fountain key position adjusting device 11 obtains, from a predetermined “image area ratio—ink fountain key opening ratio conversion curve”, an opening ratio K of the ink fountain key based on the image area ratio of a corresponding area of a printing plate. The ink fountain key position adjusting device 11 then adds the opening ratio K to a home position KO of the ink fountain key 4 to set a target position KP (KP=KO+K), thereby adjusting the position of the ink fountain key 4 to the set target position KP.
The present inventors examined the influence on the temperature change and found that the frame temperature of the printing press and the ink fountain key home position had a correlation. More specifically, the gap amount between the ink fountain key and the ink fountain roller changes as the machine thermally expands due to a temperature change. This changes the home position of the ink fountain key. Noting this point, the present inventors found the correlation between the ink fountain key home position and the frame temperature of the printing press.
Referring to
The ink fountain key position adjusting device 11 periodically receives the frame temperature T from the temperature detector 10 and reads out the ink fountain key home position correction amount KOA corresponding to the frame temperature T from the table TB1. The readout ink fountain key home position correction amount KOA is added to the home position KO to obtain a corrected home position KO′ (KO′=KO+KOA). The ink fountain key opening ratio K obtained from the “image area ratio—ink fountain key opening ratio conversion curve” is added to the corrected home position KO′ to obtain a corrected position KP′ (KP′=KO′+K). The position of the ink fountain key 4 is adjusted to the corrected position KP′.
When the target position KP is corrected on the basis of the frame temperature T in the above-described way, the ink fountain key 4 and the ink fountain roller 3 maintain a predetermined gap amount between them so no change takes place in the color tones of printed products during printing. The operator need not finely adjust the ink supply amount. No high skill is necessary, and the labor decreases. Since fine adjustment of the ink supply amount is unnecessary, printed products suffer fewer wasted paper.
The above-described system corrects the home position KO of the ink fountain key 4 upon setting the target position KP, thereby eventually correcting the target position KP of the ink fountain key 4 (home position correction system). Instead, the opening ratio K to be added to the home position KO of the ink fountain key 4 upon setting the target position KP may be corrected to eventually correct the target position KP of the ink fountain key 4 (opening ratio correction system). The target position KP of the ink fountain key 4 itself may be corrected (target position correction system).
To correct the opening ratio K of the ink fountain key 4, a conversion table TB2 (
To correct the target position KP of the ink fountain key 4 itself, a table TB3 representing the relationship between the frame temperature T and an ink fountain key position correction amount KPA is generated and set in the ink fountain key position adjusting device 11. In this case, the ink fountain key position adjusting device 11 periodically receives the frame temperature T from the temperature detector 10 and reads out the ink fountain key position correction amount KPA corresponding to the frame temperature T from the table TB3. The readout ink fountain key position correction amount KPA is added to the target position KP (KP=KO+K) to obtain the corrected position KP′ (KP′=KP+KPA=KO+K+KPA). The position of the ink fountain key 4 is adjusted to the corrected position KP′.
In principles 1 to 3 described above, formulas may be set as the tables TB1, TB2, and TB3. The tables TB2 and TB3 are generated on the basis of the correlation to the frame temperature T by repeating experiments, like the table TB1.
An ink supply amount control device including an ink fountain key position adjusting function according to the first embodiment of the present invention will be described next with reference to
The CPU 20A has a home position correction unit 201 that corrects the home position of the ink fountain key 4 in accordance with the outputs from the frame temperature measuring devices FS1 to FSM. The ink supply amount control device 20 connects to a printing press control device 30, ink fountain roller rotation amount control devices (to be referred to as rotation amount control devices hereinafter) 40-1 to 40-M, and ink fountain key opening ratio control devices (to be referred to as opening ratio control devices hereinafter) 50-1 to 50-MN via the interface 20J.
The rotation amount control devices 40-1 to 40-M correspond to the first to Mth printing units of the respective colors. The rotation amount control devices 40-1 to 40-M adjust the feed amounts of the ink fountain rollers 3. The opening ratio control devices 50-1 to 50-MN correspond to all the ink fountain keys 4 of the first to Mth printing units of the respective colors. The opening ratio control devices 50-1 to 50-MN adjust the opening ratios of the ink fountain keys 4 with respect to the ink fountain rollers 3.
The frame temperature measuring devices FS1 to FSM correspond to the first to Mth printing units of the respective colors. The frame temperature measuring devices FS1 to FSM measure the frame temperatures T (T1 to TM) of the printing press near the ink fountain rollers 3 or ink fountain keys 4 of the printing units.
As shown in
Each of the opening ratio control devices 50-1 to 50-MN connects to the ink supply amount control device 20 via the interface 50L. The rotary encoder 50C generates a rotation pulse for ever predetermined number of revolutions (angle) of the motor 50B and outputs the pulse to the counter 50D.
As shown in
Each of the rotation amount control devices 40-1 to 40-M connects to the ink supply amount control device 20 via the interface 40I. The rotary encoder 40C generates a rotation pulse for ever predetermined number of revolutions (angle) of the motor 40B and outputs the pulse to the motor driver 40A.
As shown in
The memory M11 stores target positions KPmn of the ink fountain keys of the printing units with the printing unit numbers UNm. The memory M12 stores the rotation amounts Rm of reference ink fountain rollers corresponding to the ink colors ICm. The memory M13 stores the outputs from the frame temperature measuring devices of the printing units with the printing unit numbers UNm. The memory M14 stores frame temperatures Tm of the printing units with the printing unit numbers UNm. The memory M15 stores a conversion table representing the relationship between the frame temperature T of each printing unit and the ink fountain key home position correction amount KOA. The memory M16 stores home position correction amounts KOAm of the ink fountain keys of the printing units with the printing unit numbers UNm. The memory M17 stores corrected home positions KOmn′ of the ink fountain keys of the printing units with the printing unit numbers UNm. The memory M18 stores the corrected positions KPmn′ of the ink fountain keys of the printing units with the printing unit numbers UNm.
The CPU 20A of the ink supply amount control device 20 obtains various kinds of input information received via the interfaces 20H to 20J and operates in accordance with a program stored in the ROM 20C while accessing the RAM 20B and storage unit 20G. The ROM 20C stores an ink fountain key target position correction program to correct the target position of an ink fountain key as a program unique to this embodiment. An ink fountain key target position correction operation by the CPU 20A will be described below with reference to the flowcharts in
The CPU 20A initializes the memories M1 to M6, M8, M11, M13, M14, M16, and M17 (
When the operator turns on the ink preset switch SW1 (YES in step S104), the CPU 20A sets the count value M in the memory M5 to “1” (step S105) and then repeats the processing operation in steps S106 to S117 (
The processing operation in steps S106 to S117 will be described. The CPU 20A sets the count value N in the memory M6 to “1” (step S106) and reads out, from the memory M2, the printing unit number UNm of the Mth (M=1) printing unit to be used for printing (step S107). The ink color ICm of the printing unit with the Mth (M=1) printing unit number UNm is read out from the memory M3 (step S108). The image area ratio—ink fountain key opening ratio conversion table corresponding to the ink color ICm is read out from the memory M7 (step S109).
The image area ratio IRmn in an area corresponding to the Nth (N=1) ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm is read out from the memory M4 (step S110). The opening ratio Kmn of the Nth (N=1) ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm is obtained by using the image area ratio—ink fountain key opening ratio conversion table read out in step S109 on the basis of the image area ratio IRmn in an area corresponding to the Nth (N=1) ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm and stored in the memory M8 (step S111).
The CPU 20A increments the count value N in the memory M6 by one to set N=2 (step S112) and reads out the total number Nmax of ink fountain keys of each printing unit from the memory M9 (step S113). The process in steps S108 to S114 is repeated until the count value N exceeds the total number Nmax of ink fountain keys. With this process, the opening ratios Kmn of the ink fountain keys of the printing unit with the Mth (M=1) printing unit number UNm are obtained and stored in the memory M8.
If the count value N exceeds Nmax (YES in step S114), the CPU 20A increments the count value M by one to set M=2 (step S115) and reads out, from the memory M1, the number Mmax of printing units to be used for printing (step S116). The process in steps S106 to S117 is repeated until the count value M exceeds the number Mmax of printing units. With this process, the opening ratios Kmn of the ink fountain keys of all printing units to be used for printing are obtained and stored in the memory M8.
If the count value M exceeds Mmax in step S117, the CPU 20A sets the count value M in the memory M5 to “1” (
The processing operation in steps S119 to S129 will be described. The CPU 20A sets the count value N in the memory M6 to “1” (step S119) and reads out, from the memory M2, the printing unit number UNm of the Mth (M=1) printing unit to be used for printing (step S120). The home position KOmn of the Nth (N=1) ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm is read out from the memory M10 (step S121). The opening ratio Kmn of the Nth (N=1) ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm is read out from the memory M8 (step S122).
The opening ratio Kmn of the Nth (N=1) ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm is added to the home position KOmn of the Nth (N=1) ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm read out in step S121. The sum is stored, in the memory M11, as the target position KPmn (KPmn=KOmn+Kmn) of the Nth (N=1) ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm (step S123).
The CPU 20A increments the count value N in the memory M6 by one to set N=2 (step S124) and reads out the total number Nmax of ink fountain keys of each printing unit from the memory M9 (step S125). The process in steps S121 to S126 is repeated until the count value N exceeds the total number Nmax of ink fountain keys. With this process, the target positions KPmn of the ink fountain keys of the printing unit with the Mth (M=1) printing unit number UNm are obtained and stored in the memory M11.
If the count value N exceeds Nmax (YES in step S126), the CPU 20A increments the count value M by one to set M=2 (step S127) and reads out, from the memory M1, the number Mmax of printing units to be used for printing (step S128). The process in steps S119 to S129 is repeated until the count value M exceeds the number Mmax of printing units. With this process, the target positions KPmn of the ink fountain keys of all printing units to be used for printing are obtained and stored in the memory M11.
If the count value M exceeds Mmax in step S129, the CPU 20A sets the count value M in the memory M5 to “1” (
The processing operation in steps S131 to S141 will be described. The CPU 20A sets the count value N in the memory M6 to “1” (step S131) and reads out, from the memory M2, the printing unit number UNm of the Mth (M=1) printing unit to be used for printing (step S132). The target position KPmn of the Nth (N=1) ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm is read out from the memory M11 (step S133). The readout target position KPmn of the Nth (N=1) ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm is transmitted to one of the opening ratio control devices 50-1 to 50-MN, which corresponds to the Nth (N=1) ink fountain key of the printing unit (step S134).
Upon receiving a reception confirmation signal transmitted from a corresponding one of the opening ratio control devices 50-1 to 50-MN (YES in step S135), the CPU 20A increments the count value N in the memory M6 by one to set N=2 (step S136). The CPU 20A reads out the total number Nmax of ink fountain keys of each printing unit from the memory M9 (step S137). The process in steps S133 to S138 is repeated until the count value N exceeds the total number Nmax of ink fountain keys. With this process, the target positions KPmn of the ink fountain keys of the printing unit with the Mth (M=1) printing unit number UNm are transmitted to the opening ratio control devices 50-1 to 50-MN.
If the count value N exceeds Nmax (YES in step S138), the CPU 20A increments the count value M by one to set M=2 (step S139) and reads out, from the memory M1, the number Mmax of printing units to be used for printing (step S140). The process in steps S131 to S141 is repeated until the count value M exceeds the number Mmax of printing units. With this process, the target positions KPmn of the ink fountain keys of all printing units to be used for printing are transmitted to the opening ratio control devices 50-1 to 50-MN.
If the count value M exceeds Mmax in step S141, the CPU 20A sets the count value M in the memory M5 to “1” (
The processing operation in steps S143 to S150 will be described. The CPU 20A reads out, from the memory M2, the printing unit number UNm of the Mth (M=1) printing unit to be used for printing (step S143). The ink color ICm of the printing unit with the Mth (M=1) printing unit number UNm is read out from the memory M3 (step S144). The reference rotation amount Rm of the ink fountain roller corresponding to the ink color ICm is read out from the memory M12 (step S145). The readout reference rotation amount Rm of the ink fountain roller corresponding to the ink color ICm is transmitted to a corresponding one of the rotation amount control devices 40-1 to 40-M of the printing unit with the Mth (M=1) printing unit number UNm (step S146).
Upon receiving a reception confirmation signal transmitted from a corresponding one of the rotation amount control devices 40-1 to 40-M (YES in step S147), the CPU 20A increments the count value M in the memory M5 by one to set M=2 (step S148). The CPU 20A reads out the number Mmax of printing units to be used for printing from the memory M1 (step S149). The process in steps S143 to S150 is repeated until the count value M exceeds the number Mmax of printing units. With this process, the reference rotation amounts Rm of the ink fountain rollers of the all printing units used for printing are transmitted to the rotation amount control devices 40-1 to 40-M.
If the count value M exceeds Mmax in step S150, the CPU 20A sets the count value M in the memory M5 to “1” (
The processing operation in steps S152 to S157 will be described. The CPU 20A reads out, from the memory M2, the printing unit number UNm of the Mth (M=1) printing unit to be used for printing (step S152). The CPU 20A reads an output from a frame temperature measuring device FS of the printing unit with the Mth (M=1) printing unit number UNm (step S153). The CPU 20A calculates the frame temperature Tm of the printing unit with the Mth (M=1) printing unit number UNm on the basis of the output from the frame temperature measuring device FS of the printing unit (step S154). The calculated frame temperature Tm is stored in the memory M14.
The CPU 20A increments the count value M in the memory M5 by one to set M=2 (step S155) and reads out, from the memory M1, the number Mmax of printing units to be used for printing (step S156). The process in steps S152 to S157 is repeated until the count value M exceeds the number Mmax of printing units. With this process, the frame temperatures Tm of all printing units to be used for printing are obtained and stored in the memory M14.
If the count value M exceeds Mmax in step S157, the CPU 20A sets the count value M in the memory M5 to “1” (
The processing operation in steps S159 to S165 will be described. In step S159, the CPU 20A reads out, from the memory M2, the printing unit number UNm of the Mth (M=1) printing unit to be used for printing (step S159). The frame temperature—ink fountain key home position correction amount conversion table of the printing unit with the Mth (M=1) printing unit number UNm is read out from the memory M15 (step S160). The frame temperature Tm of the printing unit with the Mth (M=1) printing unit number UNm is read out from the memory M14 (step S161).
The home position correction amount KOAm of the ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm is obtained by using the frame temperature—ink fountain key home position correction amount conversion table of the printing unit read out in step S160 on the basis of the frame temperature Tm of the printing unit with the Mth (M=1) printing unit number and stored in the memory M16 (step S162).
The CPU 20A increments the count value M in the memory M5 by one to set M=2 (step S163) and reads out, from the memory M1, the number Mmax of printing units to be used for printing (step S164). The process in steps S159 to S165 is repeated until the count value M exceeds the number Mmax of printing units. With this process, the home position correction amounts KOAm of the ink fountain keys of all printing units to be used for printing are obtained and stored in the memory M16.
If the count value M exceeds Mmax in step S165, the CPU 20A sets the count value M in the memory M5 to “1” (
The processing operation in steps S167 to S177 will be described. The CPU 20A sets the count value N in the memory M6 to “1” (step S167) and reads out, from the memory M2, the printing unit number UNm of the Mth (M=1) printing unit to be used for printing (step S168). The home position KOmn of the Nth (N=1) ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm is read out from the memory M10 (step S169). The home position correction amount KOAm of the ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm is read out from the memory M16 (step S170).
The home position correction amount KOAm of the ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm is added to the home position KOmn of the Nth (N=1) ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm read out in step S169. The sum is stored, in the memory M17, as the corrected home position KOmn′ (KOmn′=KOmn+KOAm) of the Nth (N=1) ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm (step S171).
The CPU 20A increments the count value N in the memory M6 by one to set N=2 (step S172) and reads out the total number Nmax of ink fountain keys of each printing unit from the memory M9 (step S173). The process in steps S167 to S174 is repeated until the count value N exceeds the total number Nmax of ink fountain keys. With this process, the corrected home positions KOmn′ of the ink fountain keys of the printing unit with the Mth (M=1) printing unit number UNm are obtained and stored in the memory M17.
If the count value N exceeds Nmax (YES in step S174), the CPU 20A increments the count value M by one to set M=2 (step S175) and reads out, from the memory M1, the number Mmax of printing units to be used for printing (step S176). The process in steps S167 to S177 is repeated until the count value M exceeds the number Mmax of printing units. With this process, the corrected home positions KOmn′ of the ink fountain keys of all printing units to be used for printing are obtained and stored in the memory M17. The home position correction unit 201 of the CPU 20A executes the above-described process in step S158 to S177.
If the count value M exceeds Mmax in step S177, the CPU 20A sets the count value M in the memory M5 to “1” (
The processing operation in steps S179 to S189 will be described. The CPU 20A sets the count value N in the memory M6 to “1” (step S179) and reads out, from the memory M2, the printing unit number UNm of the Mth (M=1) printing unit to be used for printing (step S180). The corrected home position KOmn′ of the Nth (N=1) ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm is read out from the memory M17 (step S181). The opening ratio Kmn of the Nth (N=1) ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm is read out from the memory M8 (step S182).
The opening ratio Kmn of the Nth (N=1) ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm is added to the corrected home position KOmn′ of the Nth (N=1) ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm read out in step S181. The sum is stored, in the memory M18, as the corrected position KPmn′ (KPmn′=KOmn′+Kmn) of the Nth (N=1) ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm (step S183).
The CPU 20A increments the count value N in the memory M6 by one to set N=2 (step S184) and reads out the total number Nmax of ink fountain keys of each printing unit from the memory M9 (step S185). The process in steps S181 to S186 is repeated until the count value N exceeds the total number Nmax of ink fountain keys. With this process, the corrected positions KPmn′ of the ink fountain keys of the printing unit with the Mth (M=1) printing unit number UNm are obtained and stored in the memory M18.
If the count value N exceeds Nmax (YES in step S186), the CPU 20A increments the count value M by one to set M=2 (step S187) and reads out, from the memory M1, the number Mmax of printing units to be used for printing (step S188). The process in steps S179 to S189 is repeated until the count value M exceeds the number Mmax of printing units. With this process, the corrected positions KPmn′ of the ink fountain keys of all printing units to be used for printing are obtained and stored in the memory M18.
If the count value M exceeds Mmax in step S189, the CPU 20A sets the count value M in the memory M5 to “1” (
The processing operation in steps S191 to S201 will be described. The CPU 20A sets the count value N in the memory M6 to “1” (step S191) and reads out, from the memory M2, the printing unit number UNm of the Mth (M=1) printing unit to be used for printing (step S192). The corrected position KPmn′ of the Nth (N=1) ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm is read out from the memory M18 (step S193). The readout corrected position KPmn′ of the Nth (N=1) ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm is transmitted to one of the opening ratio control devices 50-1 to 50-MN, which corresponds to the Nth (N=1) ink fountain key of the printing unit (step S194).
Upon receiving a reception confirmation signal transmitted from a corresponding one of the opening ratio control devices 50-1 to 50-MN (YES in step S195), the CPU 20A increments the count value N in the memory M6 by one to set N=2 (step S196). The CPU 20A reads out the total number Nmax of ink fountain keys of each printing unit from the memory M9 (step S197). The process in steps S193 to S198 is repeated until the count value N exceeds the total number Nmax of ink fountain keys. With this process, the corrected positions KPmn′ of the ink fountain keys of the printing unit with the Mth (M=1) printing unit number UNm are transmitted to the opening ratio control devices 50-1 to 50-MN.
If the count value N exceeds Nmax (YES in step S198), the CPU 20A increments the count value M by one to set M=2 (step S199) and reads out, from the memory M1, the number Mmax of printing units to be used for printing (step S200). The process in steps S191 to S201 is repeated until the count value M exceeds the number Mmax of printing units. With this process, the corrected positions KPmn′ of the ink fountain keys of all printing units to be used for printing are transmitted to the opening ratio control devices 50-1 to 50-MN.
If the count value M exceeds Mmax in step S201, the CPU 20A returns to step S151 in
Upon receiving the target position KPmn or corrected position KPmn′ of an ink fountain key from the ink supply amount control device 20 (
The CPU 50E reads the count value of the counter 50D (step S214) and obtains the current position of the ink fountain key from the read count value of the counter 50D (step S215). If the current position of the ink fountain key matches the target position (
If the current position of the ink fountain key does not match the target position (NO in step S216), the ink fountain key driving motor 50B is driven until the current position of the ink fountain key matches the target position (steps S217 to S223). Then, the process returns to step S210 to prepare for reception of the target position KPmn or corrected position KPmn′ of the next ink fountain key from the ink supply amount control device 20.
Upon receiving the reference rotation amount Rm of an ink fountain roller from the ink supply amount control device 20 (
An ink supply amount control device for a printing press according to the second embodiment of the present invention will be described with reference to
In the second embodiment, a storage unit 20G incorporates a memory M15′ to store the frame temperature—ink fountain key opening ratio correction amount conversion table of each printing unit, and a memory M16′ to store an opening ratio correction amount KAm of an ink fountain key of a printing unit with a printing unit number UNm in place of the memories M15 and M16 of the first embodiment. A frame temperature—ink fountain key opening ratio correction amount conversion table representing the relationship between a frame temperature T of each printing unit and the opening ratio correction amount KAm of an ink fountain key is set in the memory M15′. A CPU 20A has an opening ratio correction unit 202 that corrects the opening ratios of ink fountain keys 4 in accordance with the outputs from frame temperature measuring devices FS1 to FSM.
If a count value M exceeds Mmax in step S157 (
The processing operation in steps S359 to S365 will be described. The CPU 20A reads out, from a memory M2, the printing unit number UNm of the Mth (M=1) printing unit to be used for printing (step S359). The frame temperature—ink fountain key opening ratio correction amount conversion table of the printing unit with the Mth (M=1) printing unit number UNm is read out from the memory M15′ (step S360). A frame temperature Tm of the printing unit with the Mth (M=1) printing unit number UNm is read out from a memory M14 (step S361).
The opening ratio correction amount KAm of the ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm is obtained by using the frame temperature—ink fountain key opening ratio correction amount conversion table of the printing unit read out in step S360 on the basis of the frame temperature Tm of the printing unit with the Mth (M=1) printing unit number UNm and stored in the memory M16′ (step S362).
The CPU 20A increments the count value M in the memory M5 by one to set M=2 (step S363) and reads out, from a memory M1, a number Mmax of printing units to be used for printing (step S364). The process in steps S359 to S365 is repeated until the count value M exceeds the number Mmax of printing units. With this process, the opening ratio correction amounts KAm of the ink fountain keys of all printing units to be used for printing are obtained and stored in the memory M16′.
If the count value M exceeds Mmax in step S365, the CPU 20A sets the count value M in the memory M5 to “1” (
The processing operation in steps S367 to S378 will be described. The CPU 20A sets a count value N in a memory M6 to “1” (step S367) and reads out, from the memory M2, the printing unit number UNm of the Mth (M=1) printing unit to be used for printing (step S368). A home position KOmn of the Nth (N=1) ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm is read out from a memory M10 (step S369). An opening ratio Kmn of the Nth (N=1) ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm is read out from a memory M8 (step S370). The opening ratio correction amount KAm of the ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm is read out from the memory M16′ (step S371).
The CPU 20A adds the home position KOmn of the Nth (N=1) ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm read out in step S369, the opening ratio Kmn of the Nth (N=1) ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm read out in step S370, and the opening ratio correction amount KAm of the ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm read out in step S371. The sum is stored, in a memory M18, as the corrected position KPmn′ (KPmn′=KOmn+Kmn+KAm) of the Nth (N=1) ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm (step S372).
The CPU 20A increments the count value N in the memory M6 by one to set N=2 (step S373) and reads out a total number Nmax of ink fountain keys of each printing unit from a memory M9 (step S374). The process in steps S369 to S375 is repeated until the count value N exceeds the total number Nmax of ink fountain keys. With this process, the corrected positions KPmn′ of the ink fountain keys of the printing unit with the Mth (M=1) printing unit number UNm are obtained and stored in the memory M18.
If the count value N exceeds Nmax (YES in step S375), the CPU 20A increments the count value M by one to set M=2 (step S376) and reads out, from the memory M1, the number Mmax of printing units to be used for printing (step S377). The process in steps S367 to S378 is repeated until the count value M exceeds the number Mmax of printing units. With this process, the corrected positions KPmn′ of the ink fountain keys of all printing units to be used for printing are obtained and stored in the memory M18. The opening ratio correction unit 202 of the CPU 20A executes the above-described process in steps S358 to S377.
If the count value M exceeds Mmax in step S378, the CPU 20A sets the count value M in the memory M5 to “1” (
An ink supply amount control device for a printing press according to the third embodiment of the present invention will be described with reference to
In the third embodiment, a storage unit 20G incorporates a memory M15″ to store the frame temperature—ink fountain key position correction amount conversion table of each printing unit, and a memory M16″ to store a position correction amount KPAm of an ink fountain key of a printing unit with a printing unit number UNm in place of the memories M15 and M16 of the first embodiment. A frame temperature—ink fountain key position correction amount conversion table representing the relationship between a frame temperature T of each printing unit and the position correction amount KPAm of an ink fountain key is set in the memory M15″. A CPU 20A has a target position correction unit 203 that corrects the target positions of ink fountain keys 4 in accordance with the outputs from frame temperature measuring devices FS1 to FSM.
If a count value M exceeds Mmax in step S157 (
The processing operation in steps S459 to S465 will be described. The CPU 20A reads out, from a memory M2, the printing unit number UNm of the Mth (M=1) printing unit to be used for printing (step S459). The frame temperature—ink fountain key position correction amount conversion table of the printing unit with the Mth (M=1) printing unit number UNm is read out from the memory M15″ (step S460). A frame temperature Tm of the printing unit with the Mth (M=1) printing unit number UNm is read out from a memory M14 (step S461).
The position correction amount KPAm of the ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm is obtained by using the frame temperature—ink fountain key position correction amount conversion table of the printing unit read out in step S460 on the basis of the frame temperature Tm of the printing unit and stored in the memory M16″ (step S462).
The CPU 20A increments the count value M in the memory M5 by one to set M=2 (step S463) and reads out, from a memory M1, a number Mmax of printing units to be used for printing (step S464). The process in steps S459 to S465 is repeated until the count value M exceeds the number Mmax of printing units. With this process, the position correction amounts KPAm of the ink fountain keys of all printing units to be used for printing are obtained and stored in the memory M16″.
If the count value M exceeds Mmax in step S465, the CPU 20A sets the count value M in the memory M5 to “1” (
The processing operation in steps S467 to S477 will be described. The CPU 20A sets a count value N in a memory M6 to “1” (step S467) and reads out, from the memory M2, the printing unit number UNm of the Mth (M=1) printing unit to be used for printing (step S468). A target position KPmn of the Nth (N=1) ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm is read out from a memory M11 (step S469). The position correction amount KPmn of the ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm is read out from the memory M16″ (step S470).
The position correction amount KPAm of the ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm is added to the target position KPmn of the Nth (N=1) ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm read out in step S469. The sum is stored, in a memory M18, as the corrected position KPmn′ (KPmn′=KPmn+KPAm) of the Nth (N=1) ink fountain key of the printing unit with the Mth (M=1) printing unit number UNm (step S471).
The CPU 20A increments the count value N in the memory M6 by one to set N=2 (step S472) and reads out a total number Nmax of ink fountain keys of each printing unit from a memory M9 (step S473). The process in steps S467 to S474 is repeated until the count value N exceeds the total number Nmax of ink fountain keys. With this process, the corrected positions KPmn′ of the ink fountain keys of the printing unit with the Mth (M=1) printing unit number UNm are obtained and stored in the memory M18.
If the count value N exceeds Nmax (YES in step S474), the CPU 20A increments the count value M by one to set M=2 (step S475) and reads out, from the memory M1, the number Mmax of printing units to be used for printing (step S476). The process in steps S467 to S477 is repeated until the count value M exceeds the number Mmax of printing units. With this process, the corrected positions KPmn′ of the ink fountain keys of all printing units to be used for printing are obtained and stored in the memory M18. The target position correction unit 203 of the CPU 20A executes the above-described process in steps S458 to S477.
If the count value M exceeds Mmax in step S477, the CPU 20A sets the count value M in the memory M5 to “1” (
In the above-described embodiments, the temperature of the ink fountain roller, the ink fountain key, or a printing press member near them may be the temperature of the ink fountain roller itself, the temperature of the ink fountain key itself, the temperature of the member itself close to the ink fountain roller, or the temperature of the member itself close to the ink fountain key. The temperature may be the temperature of a member located at the intermediate position between the ink fountain roller and the ink fountain key.
As described above, according to the present invention, the temperature of the ink fountain roller, ink fountain key, or a printing press member near them is measured, and the position of each ink fountain key is corrected in accordance with the measured temperature of the printing press member. Correcting the position of the ink fountain key itself, the home position of the ink fountain key, or the opening ratio of the ink fountain key allows to maintain a predetermined gap amount between the ink fountain key and the ink fountain roller and prevent any changes in color tones of printed products during printing even when the machine thermally expands due to a temperature change.
Number | Date | Country | Kind |
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177797/2006 | Jun 2006 | JP | national |