摘要:
A matrix print head includes a magnetic yoke plate, magnetic pole defining cores annularly arranged on the yoke plate, electromagnetic coils mounted on the cores, a permanent magnet plate arranged in magnetic conductive relationship to the yoke plate; the yoke plate, the cores, coils, and permanent magnet plate establishing an electromagnetic assembly, there being additionally an armature assembly including an armature plate and a plurality of deflectable radially extending armature arms, the armature assembly being arranged in relation to the electromagnetic assembly such that the armature arms cooperate with the electromagnetic cores, there being print elements such as styli connected to the armature arms; the improvement disclosed is comprised of the following features, the armature plate and the armature arms are physically separated from each other but resiliently interconnected to establish a single uncritical parasitic air gap; and the magnetic yoke and armature plates are radially, inwardly recessed vis-a-vis the permanent magnet plate. A radially inwardly and outwardly recessed intermediate plate is interposed between the permanent magnet and the armature ring.
摘要:
The armature assembly for matrix print heads having a plurality of magnetic drives for a corresponding plurality of print elements is made by providing an annular armature ring and positioning a disc annulus inside the armature ring in a concentric relation thereto; a resilient arm ring is superimposed upon the disc and armature ring so as to establish concentric placement thereto; the arm ring is fastened to the armature ring and the arms of the arm ring to the disc such that the ring arms extend above an annular gap between the armature ring and the disk; subsequent slots are thermally cutting into the disk to obtain individual armature arms, the slots extending into and through said annulus to divide the annulus into individual arms that remain connected to the armature ring on account of the fastening. The disk may have been cut out from the armature ring.
摘要:
A print head includes a coil carrier having upwardly bent legs serving as yokes and being arranged around or upon a permanent magnet whose outer face is coplanar with the end faces of the yokes; a cover plate is mounted on and in that plane having apertures adjacent the space between the permanent magnet and the closest yoke. A set of armature plates is resiliently mounted on the other side of the cover plate respectively adjacent the apertures which are filled with nonmagnetizable material, and the magnet plate of each armature has affixed to it thin, side-wall type members converging towards a main apex-point to which the stylus is mounted.
摘要:
A method and corresponding system for operating a dental handpiece, wherein the handpiece comprises a motor for driving a tool. the method comprises (a) sequentially capturing values of a physical parameter, which—at least approximately—represent the power or energy fed to the motor, (b) forming an integration value by integrating the values captured in (a), and (c) automatically reducing a power or energy fed to the motor if the integration value formed in (b) exceeds an upper threshold value. The integration value formed in (b) represents a measure of the power integrated over time and can thus be used at least approximately as a measure of the temperature of the instrument. The automatic reduction in the power or energy fed to the motor performed in (c) can therefore effectively act against a further increase in temperature or allow cooling if the temperature of the instrument exceeds an upper threshold value. In this manner, the risk of damage due to excessive temperature of the instrument can be effectively reduced.
摘要:
In the case of a treatment device, in particular a dental treatment instrument, having a tool, such as a dental drill, driven by a drive unit, and a conduit for delivery of a cooling medium to a treatment site worked by the tool, the quantity of the cooling medium delivered to the treatment site is dependent upon the removal power of the tool or upon the torque exercised by the tool.
摘要:
In a medicinal or dental hand instrument (1) comprising a hand piece (2) and a handle (6) arranged on the hand piece (2), an outlet opening (5), arranged on the front side of the handle (6), for the outlet of an abrasive therapeutic agent and a transport fluid, and a coupling terminal (4) for coupling the hand instrument (1) to a supply line for at least one transport fluid, in particular water and/or air, wherein the coupling terminal (4) is a coupling component (14b) of a coupling (13), the coupling component (14b) is arranged on an insert piece (20) which can be plugged into a plug-in socket or plug-in recess (19) and in its end zone, facing away from the flow, has one or more coaxially or paraxially disposed, sealed pipe socket couplings (10), which each connect a feed line (9, 11) for the transport fluid to an ongoing feed line (21, 22).
摘要:
A method for production of an armature device group for matrix print heads of the clapper-armature construction is based on connecting and jointly processing prefabricated parts (1, 2) such that elongated armatures with wide armature arms (4) and narrower armature arms (5) are generated. For further decreasing the production costs and for increasing the precision of the armature coordination, for facilitating mounting and for saving assembly steps, an armature circle (1) is punched out with openings (6). An annular elastic shaped plate (2) of sheet metal is then attached covering the opening (6) and the radially outer and radially inner armature arms (4, 5) are then cut out employing a method such as thermal cutting or, respectively, water-torch cutting, without damaging of the shaped plate (2).
摘要:
A matrix printhead having a plurality of electromagnetic drives arranged in a cluster including a plurality of drive elements further having a plurality of reciprocating print needles, wires or styli, includes additionally a fastening structure for each of these needles, wires or styli to the drive elements in that the drive element has a width dimension which is larger than a diameter or a representative diameter dimension for the print needle, wire or stylus so as to accomodate an opening in the fastening area having said width and having a cross sectional contour which matches at least in parts the contour of the periphery of the needle to be inserted, there may be an extra slot and the needle as inserted is brazed or soldered to a opening. The opening is at an angle of between 40 and 60 degrees to the plane of the armature.
摘要:
An armature (4) is coordinated to each print pin (1) with a pin guide case (9) and in a coil support case (14) an electromagnetic coil (3) and magnet yokes (3a, 3b) in a matrix pin print head. In order to improve the system of the individual armatures (4) and their support, all armatures (4) are maintained in operations with a shaped sheet metal (19, 19a) and are connected thereby to each other and thereby form a unit (4, 19). Thus unit (4, 19) is centered via in the pin guide case (9) via several cogs (25), distributed over the circumference, and cogs are provided, which center this unit (4, 19) also in a coil support case (14).
摘要:
A device for disinfecting, sterilizing and/or maintaining medical, especially dental, instruments comprises a maintenance and cleaning chamber for accommodating instruments to be conditioned and means for supplying different cleaning or maintenance media for cleaning, disinfecting or sterilizing and/or maintaining the instruments in subsequent steps. The start times of the conditioning cycles for the different instruments are staggered.