Claims
- 1. A sheet transferring apparatus for transferring a sheet between a plurality of printing units including a transfer cylinder rotatively provided between the adjacent units, wherein printing operations on a single surface and on both surfaces of the sheet are selectively performed, said apparatus comprising:
- a power source for actuating the transfer cylinder;
- a first rotating member mechanically connected to the power source;
- a second rotating member mechanically connected to the transfer cylinder, said second rotating member being arranged to be driven by the first rotating member;
- phase adjusting means for adjusting a phase between the first rotating member and the second rotating member; and
- stopping means formed with the first and the second rotating members respectively, for stopping relative rotation between the first and the second rotating members.
- 2. An apparatus as set forth in claim 1, wherein the first rotating member includes a drive gear; and the second rotating member includes a driven gear mating with the drive gear.
- 3. An apparatus as set forth in claim 2, wherein said phase adjusting means includes:
- a motor;
- a decelerator operably connected to the drive and driven gears; and
- a rotary shaft mounted on the decelerator for connecting the decelerator to the motor, said rotary shaft being arranged to adjust the phase between the rotating members when the rotary shaft is rotated by the motor.
- 4. An apparatus as set forth in claim 3, wherein said drive gear is set at a reference position corresponding to a predetermined phase between the drive gear and the driven gear, when printing mode is changed from the both sides printing mode to the single side printing mode.
- 5. An apparatus as set forth in claim 4, wherein said stopping means includes a first stopper formed with the drive gear and a second stopper formed with the driven gear, said first and second stoppers being arranged to abut against each other to stop relative rotation between said drive gear and said driven gear.
- 6. An apparatus as set forth in claim 5, wherein said first stopper and said second stopper being arranged to abut against each other when said drive gear rotates to the reference position.
- 7. An apparatus as set forth in claim 1 further comprising:
- means for detecting a relative position of said first rotating member and said second rotating member; and
- means for protecting said stopping means, wherein said protecting means stops the turning movement of said first rotating member before said stopping means abut against each other and restarts the turning movement of said first rotating member at a low speed to allow said stopping means to abut against each other.
- 8. An offset press having a plurality of printing units wherein printing operations on a single surface and on both surfaces of a printing sheet are selectively performed when the sheet is transferred from the preceding printing unit to the next printing unit by a transfer cylinder rotatively provided between the adjacent units, said press comprising:
- a power source for actuating the transfer cylinder;
- a first rotating member mechanically connected to the power source;
- a second rotating member mechanically connected to the transfer cylinder, said second rotating member being arranged to be driven by the first rotating member;
- phase adjusting means for adjusting a phase between the first rotating member and the second rotating member;
- stopping means formed with the first and the second rotating members respectively, for stopping relative rotation between the first and the second rotating members;
- means for detecting a relative position of said first rotating member and said second rotating member; and
- means for protecting said stopping means, wherein said protecting means stops the turning movement of said first rotating member before said stopping means abut against each other and restarts the turning movement of said first rotating member at a low speed to allow said stopping means to abut against each other.
- 9. An apparatus as set forth in claim 8, wherein the first rotating member includes a drive gear; and the second rotating member includes a driven gear mating with the drive gear.
- 10. An apparatus as set forth in claim 9, wherein said phase adjusting means includes:
- a motor;
- a decelerator operably connected to the drive and driven gears; and
- a rotary shaft mounted on the decelerator for connecting the decelerator to the motor, said rotary shaft being arranged to adjust the phase between the rotating members when the rotary shaft is rotated by the motor.
- 11. An apparatus as set forth in claim 10, wherein said drive gear is set at a reference position corresponding to a predetermined phase between the drive gear and the driven gear, when printing mode is changed from the both sides printing mode to the single side printing mode.
- 12. An apparatus as set forth in claim 11, wherein said stopping means includes a first stopper formed with the drive gear and a second stopper formed with the driven gear, said first and second stoppers being arranged to abut against each other to stop relative rotation between said drive gear and said driven gear.
- 13. An apparatus as set forth in claim 12, wherein said first stopper and said second stopper being arranged to abut against each other when said drive gear rotates to the reference position.
- 14. An apparatus as set forth in claim 13, wherein said detecting means includes a sensor for outputting a signal when the position of the drive gear is close to the reference position.
- 15. An apparatus as set forth in claim 14, wherein said protecting means includes a central processing unit for braking the drive gear in accordance the signal from the sensor.
- 16. An offset press having a plurality of printing units wherein printing operations on a single surface and on both surfaces of a printing sheet are selectively performed when the sheet is transferred from the preceding printing unit to the next printing unit by a transfer cylinder rotatively provided between the adjacent units, said press comprising:
- a first motor for actuating the transfer cylinder;
- a drive gear mechanically connected to the motor, a driven gear mechanically connected to the transfer cylinder, said driven gear mating with the drive gear, and said drive gear being set at a reference position corresponding to a predetermined phase between the drive gear and the driven gear, when printing mode is changed from the both sides printing mode to the single side printing mode;
- a second motor;
- a decelerator operably connected to the drive and driven gears;
- a rotary shaft mounted on the decelerator for connecting the decelerator to the second motor, said rotary shaft being arranged to adjust the phase between the drive and driven gears when the rotary shaft is rotated by the second motor;
- a first stopper formed with the drive gear;
- a second stopper formed with the driven gear, said first and second stoppers being arranged to abut against each other to stop relative rotation between said drive gear and said driven gear;
- a sensor for detecting a position of the drive gear and outputting a signal, when the detected position is close to the reference position; and
- a central processing unit for braking the drive gear in accordance with the signal from the sensor and restart the drive gear at a low speed.
Priority Claims (1)
Number |
Date |
Country |
Kind |
5-303123 |
Dec 1993 |
JPX |
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CROSS REFERENCE TO RELATED APPLICATION
This application is a continuation in part application of the U.S. application Ser. No. 08/237,684, filed on May 4, 1994, entitled SHEET TRANSFERRING APPARATUS FOR PRINTING MACHINE which is herein incorporated by reference.
US Referenced Citations (4)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
237684 |
May 1994 |
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