1. An image-forming apparatus comprising:
a transfer unit that transfers an image-formed medium by rotation thereof;
an image-forming unit that includes a first ink head and a second ink head arranged in a transfer direction of the image-formed medium at a predetermined interval and controls the first and second ink heads to eject first and second inks on the image-formed medium;
a transfer amount detecting unit that outputs a pulse signal in response to a rotational motion of the transfer unit;
a transfer reference position detecting unit that detects a reference position provided on the transfer unit;
an ink landing position calculating unit that calculates an ink landing position corresponding to the reference position on the image-formed medium by counting a pulse signal after detection of the reference position;
a storage unit that stores correction values for printing timing for one rotational cycle of the transfer unit as a correction table; and
a printing timing signal generating unit that reads out a correction value for printing timing, which corresponds to the ink landing position on the image-formed medium, from the correction table and generates a printing timing signal by shifting a phase of the pulse signal by the correction value for printing timing;
wherein the correction table includes a set of values, each value being calculated based on a measurement value of an interval between a first ink landing position by the first ink head and a second ink landing position by the second ink head in a predetermined image pattern formed on the predetermined image-formed media which are corresponding to a length longer than the one rotational cycle of the transfer unit, and canceling an error of a transfer amount of the predetermined image-formed media by the transfer unit, and
wherein the image-forming unit forms an image on the image-formed medium in transfer by controlling the first and second ink heads to eject the first and second inks in synchronization with the printing timing signal.
2. The image-forming apparatus of claim 1, wherein
the error of the transfer amount of the predetermined image-formed media is calculated by
K
\u2061
(
d
\xd7
n
)
=
–
\u2211
i
=
0
n
\u2062
KC
\u2061
(
d
\xd7
i
)
from relationships KC(y)=K(y)\u2212C(y), C(y)=K(y+d) and a condition K(0)=0,
where \u201cd\u201d is an interval between the first ink head and the second ink head;
\u201cL\u201d a length of the one rotational cycle of the transfer unit;
\u201cK(y)\u201d a landing misalignment of the first ink ejected by the first ink head at a landing position in design \u201cy\u201d on the predetermined image-formed media;
\u201cC(y)\u201d a landing misalignment of the second ink ejected by the second ink head at the landing position in design \u201cy\u201d on the predetermined image-formed media;
\u201cKC(y)\u201d a relative landing misalignment between the first ink ejected by the first ink head and the second ink ejected by the second ink head at the landing position in design \u201cy\u201d on the predetermined image-formed media; and
\u201cn\u201d an integer which satisfies a relationship d\xd7n>=L.
3. The image-forming apparatus of claim 2, further comprising:
a register unit that registers and sends the predetermined image-formed media to the transfer unit so as to start ink-ejecting from the first ink head at a landing position in design y=0 on the predetermined image-formed media with satisfying the condition: K(0)=0.
4. The image-forming apparatus of claim 1, wherein
the transfer unit includes a first transfer section that transfers an image-formed medium by rotation thereof, and a second transfer section that transfers the image-formed medium by rotation thereof,
the transfer reference position detecting unit includes a first transfer reference position detecting section that detects a first reference position provided on the first transfer section, and a second transfer reference position detecting section that detects a second reference position provided on the second transfer section,
the ink landing position calculating unit includes: a first ink landing position calculating section that calculates an ink landing position corresponding to the first reference position on the image-formed media by counting the pulse signal after detection of the first reference position; and a second ink landing position calculating section that calculates an ink landing position corresponding to the second reference position on the image-formed media by counting the pulse signal after detection of the second reference position,
the storage unit includes: a first storage section that stores correction values for printing timing for one rotational cycle of the first transfer section as a first correction table; and a second storage section that stores correction values for printing timing for one rotational cycle of the second transfer section as a second correction table, and
the correction table includes the first and second correction tables.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A powdery white vulcanization promoter composition comprising; a modified calcium carbonate (A) surface-treated with a fatty acid or a resin acid and a silisic acid; a highly oil-absorbing inorganic filler (B) exhibiting an oil absorption of 50 to 300 mL100 g; and a vulcanization promoter (C) which is in a liquid form at ordinary temperature; wherein the mixing ratio by weight of the modified carbon calcium (A) to the inorganic filter (B) (the ratio of (A):(B)) is within a range of from 30:70 to 95:5, and the content by percentage of the vulcanization promoter (C) is from 30 to 80% by weight based on the total of the composition.
2. The powdery white vulcanization promoter composition according to claim 1, wherein the modified calcium carbonate (A) has an average primary particle diameter of 0.01 to 0.5 \u03bcm.
3. The powdery white vulcanization promoter composition according to claim 1, wherein the vulcanization promoter (C) is at least one from an organic silane compound, an organic titanate compound, and an organic aluminate compound.
4. The powdery white vulcanization promoter composition according to claim 1, wherein the inorganic filler (B) is at least one selected from silica, calcium silicate, magnesium carbonate, and aluminum hydroxide.
5. A rubber composition, wherein the powdery white vulcanization promoter composition according to claim 1, and precipitated silica are blended into a rubber.
6. The rubber composition according to claim 5, wherein the powdery white vulcanization promoter composition is contained so as to set the amount of the vulcanization promoter (C) into the range of 1 to 40 parts by weight based on 100 parts by weight of the precipitated silica.
7. The powdery white vulcanization promoter composition according to claim 2, wherein the vulcanization promoter (C) is at least one from an organic silane compound, an organic titanate compound, and an organic aluminate compound.
8. The powdery white vulcanization promoter composition according to claim 2, wherein the inorganic filler (B) is at least one selected from silica, calcium silicate, magnesium carbonate, and aluminum hydroxide.
9. A rubber composition, wherein the powdery white vulcanization promoter composition according to claim 2, and precipitated silica are blended into a rubber.
10. The rubber composition according to claim 9, wherein the powdery white vulcanization promoter composition is contained so as to set the amount of the vulcanization promoter (C) into the range of 1 to 40 parts by weight based on 100 parts by weight of the precipitated silica.
11. The powdery white vulcanization promoter composition according to claim 3, wherein the inorganic filler (B) is at least one selected from silica, calcium silicate, magnesium carbonate, and aluminum hydroxide.
12. A rubber composition, wherein the powdery white vulcanization promoter composition according to claim 3, and precipitated silica are blended into a rubber.
13. The rubber composition according to claim 12, wherein the powdery white vulcanization promoter composition is contained so as to set the amount of the vulcanization promoter (C) into the range of 1 to 40 parts by weight based on 100 parts by weight of the precipitated silica.
14. A rubber composition, wherein the powdery white vulcanization promoter composition according to claim 4, and precipitated silica are blended into a rubber.
15. The rubber composition according to claim 14, wherein the powdery white vulcanization promoter composition is contained so as to set the amount of the vulcanization promoter (C) into the range of 1 to 40 parts by weight based on 100 parts by weight of the precipitated silica.