SU387425A1 - THE LEADING NODE OF THE DEVICE OF MAGNETIC RECORDING - Google Patents

Description

one

The invention relates to instrumentation, in particular to magnetic recording devices.

Known shaft units are known in which the torque from the engine to the shaft is transmitted with the help of friction or belt transmissions.

In such assemblies, the main components of the uneven angular velocity of the rotary shaft, which is in contact with the recording medium, are determined by the eccentricities of the driven and driving pulleys, the rotor swinging effect of the engine, and the inaccuracy of the friction element or the belt.

The purpose of the invention is to increase the uniformity of the angular velocity of rotation of the drive shaft.

To do this, in the proposed device, the drive shaft pulley is kinematically connected with several irift motors evenly spaced around the circumference of the same pulley.

FIG. 1 shows schematically the proposed drive unit with friction transmission in the case of three engines; pas figs. 2 - a driving unit with two, diametrically opposed engines, at which an almost complete compensation is achieved for the effect of the slave's eccentricity

on its own angular velocity is rotated; in fig. 3 - a variant of the host unit in the case of a belt drive.

In the case of two engines, the probability P between the maximum radii (or minimum) of the spider 1, their pulleys or rubberized rollers in ente time is sufficiently large and equal to 0.07; therefore, it is desirable to use three or more engines.

By calculation, it has been established that the use of a motor with six engines should be considered the most optimal. In this case, i.e., the probability of coincidence of the worst conditions is small and therefore a further increase in the number of engines slightly improves the already sufficient effect.

The device contains the main drive shaft /, made in one piece with the driven pulley, three driven engines 2, intermittent rubberized rollers 3, the clutch of which with the driven pulley and engine shafts is scraped with springs 4, magnetic tape 5, and the sliding gear of the 6th gear of the front panel. to the magnetic tape, spring 7 of the pressing roller. The variant of the knot in the case of a belt fault, shown in FIG. 3, additionally contains driving rollers 8 and drive pins 9. Subject of the invention The drive unit of the magnetic recording apparatus comprising a drive shaft with a pulley and an electric drive, characterized in that, in order to increase the uniformity of the angular velocity of rotation of the drive shaft, the pulley of the latter is kinematically connected several drive motors evenly spaced around the same pulley.

FIG. 2

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