Device for producing a multi-component compound

Abstract

The device for producing a multi-component compound, in particular for dental purposes, by mixing its components after they have been pressed out of cartridges (5) which open into a dynamic mixer (10)and are arranged exchangeably in the device, with a first motor for advancing all of the pistons assigned to the cartridges, and with a second motor for rotary driving of mixing elements in the mixer(10) via a shaft (23), which is held in engagement with the mixer (10) by spring pretensioning and can be pulled back from the mixer (10) counter to the spring pretensioning, is characterized in thatthe shaft (23) is provided with a radially extending projection (32) which, by means of the spring pretensioning, is pressed onto a ramp-like upwardly sloping cam surface (33), which is provided on its foot with an abutment surface (36), of a toothed wheel (34), which is provided with saw-like teeth and is coaxial to the shaft (23), which toothed wheel (34), in a first angle direction in which the cam surface (33) slopes upwards, is prevented from rotating by a catch (35) and, in the second angle position opposite thereto, is rotatable, the mixer drive shaft being pulled back during rotationin the first direction of rotation.

Description

technical field [0001] The invention relates to a device, especially in the field of dentistry, for the production of multicomponent substances by pressing and mixing the components from a cartridge which opens into a dynamic mixer and is arranged exchangeably in a In said device, said device has a first motor for jointly advancing a piston assigned to said cartridge and a second motor for rotationally driving a mixing element in a mixer via a shaft pre-set by a spring. The tension remains engaged with the mixer and can be pulled back from the mixer against the spring preload. Background technique [0002] With known devices of this type (EP 1279379 B1) multi-component substances can be delivered and mixed. In this case the mixer has to be replaced from time to time. This is done on the one hand for hygienic considerations when the mixed substance stays in the mixer for too long. This is especially necessary when the mixed substance has hardened due to the fact that the m...

AI Technical Summary

Problems solved by technology

In many cases, however, it is necessary to partially extrude the same cartridge filling several times in succession, wherein the mixer must be replaced at the same time if too much time has elapsed between the individual extrusion processes and the components have thus at least partially hardened in the mixer.

In this case always having to drive the piston fully back first is a disadvantage

This means a considerable time loss, especially because the piston, although it can be moved back quickly, must then move very slowly to the material still in the barrel in order to carefully "detect" the contact with the remaining material. touch

Air intrusion into the barrel can also be caused by retracting in an undesired manner

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