SU695849A1 - Printing head mechanism - Google Patents

Description

The invention relates to the field of printing mechanisms and can be used for reproducing symbolic and graphic information in input / output devices. The known mechanism of the printing head contains a sleeve located in the housing with a threaded cap, in the opening of which there is a printing needle, a coil with a winding, in the opening of which a measles is fixed, rigidly connected to the printing needle and sequentially located behind one of the coil flanges ferromagnetic and thrust washers and return spring 1 A disadvantage of the known device is its low speed. The purpose of the present invention is to improve the speed of the mechanism. The goal is achieved by the fact that the return spring is made in the form of a star-shaped plate with different beam lengths, and the support bar has a cylindrical groove, where the diameter of the groove corresponds to the length of the smallest beam of the return spring. FIG. 1 shows a general view of the print head mechanism; on Fig.2raz A-A Fig, 1; in fig. 3 - dependence of the compression force of the return spring (Fnp / and the electromagnetic force (Fj) of the electromagnet depending on the course of the core (& decisive speed; Fig. 4 - the ideal dependence of the force of the return spring compression; Fig. 5 - the dependence of the opposing force return spring on the stroke of the print mechanism mechanism. The print head mechanism includes a housing 1, a sleeve 2 with a coil 3 placed on it with a winding 4 and conclusions 5, ferromagnetic washer G, which fits tightly to the coil flange 3 and has an axial hole A bristle 7 with a printing needle rigidly connected to it at one end and a return spring 9 at the other end, a return spring 9, a ferromagnetic washer 6 that fits snugly to the end, and a support washer 10, at the end of which there is a bore with a diameter corresponding to the size of the return spring 9. Support The washer 10 is connected to the housing 1. The non-conductive threaded cap 11, serves to create a preload of the return spring 9, made in the form of a face

ubiquitous shape with a different length of the rays and protecting the mobile part of the electromagnet from mechanical radiation :.

Case 1, ferromagnetic washer. G, measles 7 and bushing 2 are made of mag / nitrating material

The mechanism works as follows.

When current is applied to Katut.iku 3, measles 7 begins to move forward to JQ

bushing 2. This movement is counteracted by the elastic of the shaft only of the long beams of the prukhina 9, resting on the surface of the support plate 10 |, and of the friction force. At the initial moment and up to p. the stroke of the core 7 to the final position, only the long rays of the evaera of the return spring 9 are working, because only they are about to tilt onto the surface of the support washer 10 having a larger diameter. Its short rays at this time are not T-1 supports and do not work. The opposing force developed by the return spring 10 is negligible. The electromagnetic force, which has the smallest value at the initial 25 operating gap, is almost completely spent on the communication of the bore 7 with the printing acceleration needle 8.

When approaching the core 7 to the sleeve 230

the printing needle 8 strikes a dyeing material, while the short rays of the return spring 9 rest on the surface of the support washer 10,

The counteracting force of the return spring 9 abruptly increases, thereby ensuring that the counteracting force required to reach is achieved;

Claims (1)

1. Patent SIV, No. 3690431, class, 197-1, 1972.