Abstract: A device for dispensing adhesive on a substrate comprises a writing head with a first dispensing nozzle and at least one second dispensing nozzle. The device can be operated in two operating modes and is configured to perform the following steps for the change from the one operating mode to the other operating mode: —lifting of the writing head, retracting or extending a pin, and lowering of the writing head to a predetermined working altitude, wherein the tips of the dispensing nozzles reach a substantially similar altitude above the substrate in the retracted state of the pin, and wherein the tip of the at least one second dispensing nozzle reaches a higher altitude above the substrate than the tip of the first dispensing nozzle in the extended state of the pin.

Abstract: A device for dispensing adhesive on a substrate comprises a writing head with a first dispensing nozzle and at least one second dispensing nozzle. The device can be operated in two operating modes and is configured to perform the following steps for the change from the one operating mode to the other operating mode: lifting of the writing head, retracting or extending a pin, and lowering of the writing head to a predetermined working altitude, wherein the tips of the dispensing nozzles reach a substantially similar altitude above the substrate in the retracted state of the pin, and wherein the tip of the at least one second dispensing nozzle reaches a higher altitude above the substrate than the tip of the first dispensing nozzle in the extended state of the pin.

Abstract: A wire bonder comprises a bonding head with a rocker which is arranged on the bonding head and is rotatable about a horizontal axis. The rocker comprises at least three bores into which a piezoelectric element each is inserted, which element is used either as a sensor or as a piezoelectric drive in order to move a horn which is fastened to a body relative to the rocker. The body is tightly screwed onto the rocker by means of at least three screws, with at least two screws being tightly screwed in a resilient way. The body is pressed against the piezoelectric elements. A membrane is preferably arranged between the rocker and the body, which membrane prevents that shearing forces can act upon the piezoelectric elements.