I found a way to do this as follows:
You will need Ifranview.
http://www.irfanview.com/An image to print
The following instructions are for all editions of Windows 7.
Open Windows Task Scheduler:
Click on Start
Click on Accessories folder
Click on Run
Type taskschd.msc
On the right, choose Create Task
Type in a name, e.g., Autoprint
From the Dropdown menu for Configure for, choose Windows 7
Click the Triggers Tab and click New
Make sure Begin Task "On a Schedule" is selected at the top
Choose your Start date and time and recurrence schedule
Click the Action tab and click New
For Program/Script enter "C:\Program Files (x86)\IrfanView\i_view32.exe" (with quotes)
For Arguments enter the path to your image e.g., "C:\AutoPrint.jpg" /print (with quotes)
Save your task
Note: if you have the 64 bit version of Irfanview, substitute "C:\Program Files\IrfanView\i_view62.exe" (with quotes)
Make sure roll paper is loaded and printer will remain on
Set ipf6300 as the default printer (at least while you are away on vacation) - Start Menu -> Printers and Devices, then right click the ipf6300 and click Set as default
Right click ipf6300 and click on Printing Preferences, make sure you have the correct media type selected for your paper
That's it! Professional autoprint results with built in Windows components.
Edit: I couldn't figure out a way to print smaller than 11 inches in height, which wastes some paper as the image is only about 5.5 inches high. The Printer Properties tab only showed letter size paper as an available choice, and the smaller size I set in Printing Preferences didn't have any effect.
I found the following image on a web site for Canon ipf6400 purge print.
Note that this method will only exercise either the PK or MK ink, depending on media type selected.