The impact printer uses a print head that either hits the surface of the ink ribbon, pressing the ink ribbon against the paper (similar to the action of a typewriter), or, less commonly, hits the back of the paper, pressing the paper against the ink ribbon (the IBM 1403 for example).
击打式打印机利用一个打印头，这个打印头要么会打到墨带表面，将墨带压在纸上（类似于打字机的动作），要么打到纸的背面，将纸压在墨带上（例如 IBM1403 打印机），不过这种情况不多。