Patent ID: 8528198

Claim:
A component mounting method comprising the steps of: providing a component mounting device comprising two substrate carrying lines which are arranged side by side for performing carrying in, positioning and carrying out of substrates, a component feeding unit feeding components; and a mounting head executing a component mounting process on the substrates by repeating a mounting turn including a series of operations ranging from picking up of the components fed by the component feeding unit to mounting the components on to the substrates, wherein the two substrate carrying lines position the substrates alternately, and each of the substrate carrying lines carries out the substrate after the mounting of the components on to the substrate is completed and then carries in and positions the next substrate; mounting the components on the substrates by repeating the mounting turn; determining whether or not the mounting turn can be completed every time the mounting head performs the mounting turn; and when it is determined that one of the mounting turns performed by the mounting head cannot be completed, executing the component mounting process by the mounting head on the substrate positioned by the substrate carrying line which is different from the substrate carrying line which is positioning the substrate constituting the object to which components are to be mounted at the point in time of making the determination by regarding the substrate as an object to which components are to be mounted.