1. A continuously variable transmission comprising:
a power source;
an input shaft rotatably driven by said power source;
a stepless speed change unit which includes a pair of pulleys, including a primary pulley driven by said input shaft and a secondary pulley driven by a belt that runs around said pair of pulleys and that is squeezed by said pulleys, said stepless speed change unit changing a speed ratio of said pair of pulleys by controlling the pulley widths of the primary pulley and the secondary pulley and thus changing the speed of the rotation of said input shaft, switching the rotation between forward and reverse rotation, and transmitting the rotation at the changed speed to an output shaft; and
a forward-reverse switching mechanism that switches direction of rotation of said output shaft between forward output rotation and reverse output rotation;
wherein power from the power source is transmitted, in order, through said input shaft, said stepless speed change unit, said forward-reverse switching mechanism, and said output shaft; and
wherein said forward-reverse switching mechanism includes i) a gear mechanism including a first rotary element which rotates in the same direction as said secondary pulley, a fixed element which is always fixed so as not to rotate, and a second rotary element which rotates in a direction which is opposite that of said secondary pulley, ii) a first clutch disposed between said first rotary element and said output shaft, and iii) a second clutch disposed between said second rotary element and said output shaft.
2. The continuously variable transmission according to claim 1, wherein said input shaft and said primary pulley are arranged on a first axis, said secondary pulley and said forward-reverse switching mechanism are arranged on a second axis that is in parallel with the first axis, and said output shaft is arranged on a third axis that is in parallel with the first axis and the second axis; wherein said second clutch is applied when running in forward; and wherein said first clutch is applied when running in reverse.
3. The continuously variable transmission according to claim 2, wherein said gear mechanism is a single pinion planetary gear set that includes a sun gear, a ring gear, and a carrier that has a single pinion in mesh with said sun gear and said ring gear; and wherein said first rotary element is said sun gear into which rotation is input from said stepless speed change unit, said fixed element is said carrier, and said second rotary element is said ring gear.
4. The continuously variable transmission according to claim 2, wherein said gear mechanism is a ravigneaux type planetary gear set that includes a first sun gear, a second sun gear, a ring gear, and a carrier that has a long pinion gear that is in mesh with said first sun gear and said ring gear, and a short pinion gear that is in mesh with said long pinion gear and said second sun gear; wherein rotation from said stepless speed change unit is input to said first sun gear; and wherein said first rotary element is the carrier, said fixed element is said ring gear, and said second rotary element is said second sun gear.
5. The continuously variable transmission according to claim 1, further comprising a countershaft mechanism disposed between said forward-reverse switching mechanism and said output shaft; wherein said input shaft and said primary pulley are arranged on a first axis; wherein said secondary pulley and said forward-reverse switching mechanism are arranged on a second axis that is in parallel with the first axis; wherein said countershaft mechanism is arranged on a third axis that is in parallel with the first axis and the second axis; wherein said output shaft is arranged on a fourth axis that is in parallel with the first axis, the second axis, and the third axis; wherein said first clutch is applied when running in forward; and wherein said second clutch is applied when running in reverse.
6. The continuously variable transmission according to claim 5, wherein said gear mechanism is a single pinion planetary gear set that includes a sun gear, a ring gear, and a carrier that has a single pinion gear in mesh with said sun gear and said ring gear; and wherein said first rotary element is said ring gear into which rotation is input from said stepless speed change unit, said fixed element is said carrier, and said second rotary element is said sun gear.
7. The continuously variable transmission according to claim 5, wherein said gear mechanism is a double pinion planetary gear set that includes a sun gear, a ring gear, and a carrier which supports a first pinion gear in mesh with said sun gear and a second pinion gear in mesh with said ring gear; and wherein said first rotary element is said carrier into which rotation is input from said stepless speed change unit said fixed element is said ring gear, and said second rotary element is said sun gear.
8. The continuously variable transmission according to claim 7, wherein said first pinion gear is in mesh with said sun gear and said second pinion gear; and wherein said second pinion gear is in mesh with said ring gear and said first pinion gear.
9. The continuously variable transmission according to claim 1:
wherein said first clutch is released in one of forward drive and reverse drive so that no rotation is transferred from said first rotary element to said output shaft and engaged in the other of forward drive and reverse drive to transfer rotation of said first rotary element to said output shaft; and
wherein said second clutch is released in the other of forward drive and reverse drive so that no rotation is transferred from said second rotary element to said output shaft and engaged in the one of forward drive and reverse drive to transmit torque from said second rotary element to said output shaft.
10. The continuously variable transmission according to claim 9 wherein said forward-reverse switching mechanism includes only one planetary gear set.
11. The continuously variable transmission according to claim 10 wherein said one planetary gear set is a single pinion planetary gear set.
12. The continuously variable transmission according to claim 10 wherein said one planetary gear set is a ravigneaux planetary gear set.
13. The continuously variable transmission according to claim 10 wherein said one planetary gear set is a double pinion planetary gear set.
14. The continuously variable transmission according to claim 1 wherein said forward-reverse switching mechanism includes only one planetary gear set.
15. The continuously variable transmission according to claim 14 wherein said one planetary gear set is a single pinion planetary gear set.
16. The continuously variable transmission according to claim 14 wherein said one planetary gear set is a ravigneaux planetary gear set.
17. The continuously variable transmission according to claim 14 wherein said one planetary gear set is a double pinion planetary gear set.
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. An image forming apparatus performing a color conversion process in accordance with a color conversion setting set by an information processing apparatus that generates print data, the image forming apparatus comprising:
a determination unit configured to determine whether a color conversion setting performed by the information processing apparatus is valid based on received print data, the received print data including information indicating whether the performed color conversion setting is valid or invalid; and
a control unit configured to control the color conversion process to be performed by the image forming apparatus based on a result determined by the determination unit.
2. The image forming apparatus according to claim 1, wherein
the determination unit determines whether the valid color conversion setting has been performed by the information processing apparatus based on an analysis result of the print data.
3. The image forming apparatus according to claim 1, wherein
the control unit comprises a switching unit configured to switch between a standard color conversion process and an extended color conversion process, the standard color conversion process being in accordance with a color conversion setting set by using a standard command, the extended color conversion process being in accordance with a color conversion setting set by using a vendor’s own extended command, wherein
when the determination unit determines that the valid color conversion setting has been performed by the information processing apparatus, the switching unit switches the color conversion process to be performed by the image forming apparatus from the extended color conversion process to the standard color conversion process.
4. The image forming apparatus according to claim 1, wherein
when at least one of a predetermined Page Description Language (PDL) command and a predetermined data pattern is included in the print data based on an analysis result of the print data, the determination unit determines that the valid color conversion setting has been performed by the information processing apparatus.
5. The image forming apparatus according to claim 3, wherein
in the image forming apparatus, a default color conversion table where an input color value is a same as an output color value is set as a color conversion table to be used for the standard color conversion process, the color conversion table converting a color value from a device-independent input color value to a device-dependent output color value.
6. The image forming apparatus according to claim 5, wherein
when the color conversion table is specified in the valid color conversion setting having been performed by the information processing apparatus, the image forming apparatus switches from the default color conversion table to the specified color conversion table and performs the standard color conversion process.
7. A color conversion control method to be used in an image forming apparatus performing a color conversion process in accordance with a color conversion setting set by an information processing apparatus that generates print data, the color conversion control method comprising:
determining whether a color conversion setting has been performed by the information processing apparatus based on received print data, the received print data including information indicating whether the performed color conversion setting is valid or invalid;
selecting, as the color conversion process to be performed, a standard color conversion process if the determination step determines that the color conversion setting performed by the information processing apparatus in the determination step is valid; and
selecting, as the color conversion process to be performed by the image forming apparatus, an extended color conversion process if the determination step determines that the color conversion setting performed by the information processing apparatus in the determination step is not valid, the extended color conversion process being a process that uses a color conversion setting set in accordance with color rendering information of the image forming device, the standard color conversion process being a process that uses a color conversion setting set in accordance with color rendering information of the information processing apparatus.
8. A non-transitory computer-readable recording medium comprising a program encoded and stored in a computer-readable format to cause a computer to execute a color conversion control method according to claim 7.
9. An information processing apparatus having a printer driver configured to receive a color conversion setting through a user interface menu and generate print data including the received setting, wherein
the printer driver performs exclusive control between a color conversion setting of Image Color Management (ICM) of the information processing apparatus and a color conversion setting set by a vendor’s own extended command in a manner such that the color conversion setting set by the vendor’s own extended command is to be performed when the setting of the Image Color Management (ICM) is determined to be invalid ICM.