As Andrey mentions, best is to (re-)create the object as a table in your script, and then save this table into a csv on the desired place. Every time you reload the application/the script (which you can define on the QV-server), the file in the destination folder will be renewed.
1. write a macro that will export charts/table boxes to text file. you can create the charts or table boxes on a hidden tab, if you do not want the qv document users to see these charts designed just for exporting.
2. configure the OnPostReLoad trigger (found in document properties - triggers) to fire the macro.
3.use a batch file to reload the qvw (using the command-line reload syntax). use windows task scheduler to schedule the batch file to run on a schedule.
since Publisher will not fire any macro code within a qlikview document, you must use the batch file reload process in order for the macro to fire.
below is an example macro. this will export data in the object CH01 to a pipe-delimited text file.