DK147905B - DEVICE FOR MELTING AND DELIVERING THERMOPLASTIC ADHESIVES - Google Patents

Description

in 147905

The invention relates to an apparatus for melting thermoplastic adhesive and for dosing dispensing of the melt material, which apparatus has at least two controllable heating stages with different: effect; '.and that / partially. horn · in handle shaped housing.

Thermoplastic adhesives are increasingly used in the fastening technique. Their advantages are essentially the rapid loadability, the lack of volatile, hazardous solvents, as well as the possibility of loosening a compound again by reheating it. In addition to pure manufacturing processes,. such as in: ex .; Throughout the shoe industry, melt adhesives are also used for assembly. Thereby the problem arises that, between the individual application times, relatively longer working breaks occur. If the appliance is completely disconnected during these breaks, it will take a relatively long time for the appliance to reach the operating temperature again for reuse.

In a known apparatus, the time spent on heating is shortened by the heating process taking place in two steps. In a first phase, a more powerful heating step is heated until a certain temperature is reached. When this is reached, a weaker heat step is switched by means of a temperature switching element, where this weaker working step is designed only for the melt heat needed for dispensing the adhesive.

However, if no melting material is delivered for a long time, there is also a risk of overheating with this appliance. To avoid this, the appliance must always be switched off before longer breaks. In this regard, the operator must decide each time whether it is a longer or a shorter period of use. This is often relatively difficult to predict and therefore imposes an additional burden on the operator 147905 2. If the appliance is switched off too often, unnecessary waiting times occur, and if the appliance is switched off too little or not switched off, there is a risk of overheating. The object of the invention is to avoid overheating, as well as excessive cooling during the application breaks of a thermoplastic adhesive melting device.

This is achieved by an apparatus according to the invention, characterized in that control means are provided on the handle which, when the handle is released, cause a switch from the higher temperature higher temperature to the lower temperature lower temperature.

In the apparatus according to the invention, the operator avoids having to decide on disconnection during the use breaks. A further significant advantage lies in the fact that the apparatus is not completely cooled, but only cooled to a lower temperature which is harmless to both the adhesive and the individual parts of the apparatus. As a result, the time spent on re-heating the appliance is very short until the operating temperature.

In principle, any switching elements such as switches, trigger or similar means can be used for switching. However, since these mostly have protruding parts and are subject to mechanical wear, it is advantageous if a touch-responsive sensing means is placed on the handle instead. The switching process is thereby triggered by the mere touch of two parts by means of the operator's hands gripping the handle. Such sensing organs are also used today in the field of entertainment electronics and are therefore very cheap elements.

When working with a melt adhesive processing apparatus, very short applications often also arise.

Claims (2)

147905 interrupts, during which e.g. an object must be placed in a particular position. Below this the appliance is placed on page 1 for a short period of time. In order not to initiate a temperature-lowering process every time, it is expedient if the control means comprise means adapted to allow the switching from the stronger to the lower heat step to take place in a time delay. This avoids unnecessary waiting for the reheat. The invention is described below with reference to the drawing which shows the apparatus according to the invention, seen from the side. The apparatus according to the invention consists essentially of a housing 1 with a handle 2 disposed on the side thereof. in the form of a cylindrical rod, adhesive body 5 is formed into a melting chamber by means of a transport mechanism not known per se. Thereby, a portion of the melting material present in the melting chamber is pressed out of it, and this material flows out through a dispensing nozzle 6 at the front end of the housing 1. Ventilation slots 7 for the cooling of the apparatus. The handle 2 is provided on the side with a sensing member 8. This sensing member 8 serves to switch from a stronger to a weaker heat stage when the handle 2 is released. When the operator's hand grasps the handle again when the appliance is used and thus touches the sensing means 8, the higher heat level is automatically switched. Claims. An apparatus for melting thermoplastic adhesive and for dispensing the melt material, said apparatus having at least two controllable heat stages of different effect and