solution to our time sheet problem

To us: Our job includes organizing multiple groups of workers at the same time for a handful of different jobs at different locations. Therefore each supervisor of one such group carries prepared time sheets with him/her to track the working times of each individual worker properly. Usually at the end of the week all the time sheets have to be collected and are brought into 1 office in order to list and print this gathered information for further use. The procedure of collecting/gathering these time sheets, get them in order and than print them takes way to much time so i want to optimise it. A mobile app would be to costly so my idea is as follows: Application on a tablet that directs to a non-public website --> users gain acess through pin and username --> on there they can fill in prepared time sheets and submit them to the admin (office) --> Office/ admin account can open and print them --> some more details would follow when someone is up for the job but thats the basic idea