I wrote an DOS based programme some years ago in QuickBasic, to print Names and Addresses on labels. One of my own printers was and still is an Epson EX800 which provides excellent service. The program was/is used on other DMP's and inkjets, It works fine on all types.
I am upgrading the programme to VB 4 and 5. It works fine on
inkjet printers using 'cut sheet' label pages, but has a problem on DMP's as described below.
I have a system that can boot Win3.11, Win95 or Win98. In
order to cater for some users who still have DMP,s I need
to include their use in my programme, described below.
I have tested the programme under Win 3.11, Win 95 and Win
98 in the 16 bit VB4 version, and under Win 95 and Win 98
in the 32 bit VB5 versions. I have tested it using both Epson EX800 and LQ550 printers.
Using continuous fan-fold labal paper, correctly set for 12 inch 'fold' pages, (in Printer Setup), the label row spacing is not adjusted correctly. The labels very slowly 'creep' up the page, so that after about 30 to 60 rows (3 to 10 'folds' depending on label height setting), label printing has moved 'UP' by app. one line, slowly encroaching on to previous rows.
Internally I have checked settings. With ScaleMode = 1, the
ScaleHeight seems correct at 17280 twips for 12 inch page, Label Spacing which is correct at 2880 twips (testing with 2 inch high labels).
I have tried to 'fool' the printer(s) by setting a custom page size just below or above 12 inches. I have also tried changing the internal 'ScaleHeight' value marginally.
Although some of my tests produce changes, the results are undesirable, and none of them cure the basic problem.
The 'creepage' is small, ammounting to about .1 inch in 30/40 labels, although occasionally there will be the odd place where the inter-label 'gap' will fall up to .25 inches short, and this does not occur at 'page' break' positions.
Can you suggest any remedy or point me at a solution. As it
occurs with all thre OS's I can't see that it is related to
this, and since it occurs with two different DM printers, I
cannot see that it is printer related.
It seems to be a programming problem, but I cannot see a way
to resolve it. All attempts to make the printer adjust its
position marginally after each page fails to produce the desired result.