There are a few some limits to the right of the copyright holder. One limit is that the owner of a particular legally produced copyrighted item is entitled, without the authority of the copyright owner, to sell or otherwise dispose of this item. Legally you cannot ever make a copy without the permission of the copyright owner. The copyright owner has the exclusive right to make copies. This even applies to out of print patterns or patterns in magazines.
Some stitchers like to make an enlarged copy of designs so they can read it easier.
Others will buy the pattern and then make a copy because they find it more convenient to carry it with them. Legally you do not have the right to do this without permission from the designer. However, I don't know of any designer who would refuse permission to enlarge the design because you are unable to use the design as it is printed. Making a photocopy simply because it may be more convenient is another matter. On one hand, designers truly want you to enjoy stitching their designs.