CS201181B1 - Facility for making the metering bands and films for adjusting the verticality of the record on the carrier and measuring the said circumstance - Google Patents

Abstract

The produced tapes and films afford adjustment of the rectangularity of recording on a tape, as well as measuring of this characteristic. The tape runs round a common body (1) with magnetic heads in a loop. The body can be tilted about an axis (12) at right angles to the tape plane. Four magnetic heads (2-5) are so mounted symmetrically to the body axis, as to lie in pairs at opposite ends of the body axis. The gaps of the magnetic heads form a single plane, and a loop ( , 11) of the measuring tape or film abuts these gaps, the loop being carried by a system of four guides (6-9). Two guides (6, 7) secure the parallelity of both loop parts in both directions and have a width sufficient for max. width of the tape. The auxiliary guides are height adjustable.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing measuring tapes and films for adjusting perpendicularity on a carrier and measuring such perpendicularity, wherein a signal of low wavelength is recorded perpendicular to the edge of the carrier.

One of the parameters influencing the quality of the magnetic recording and in particular the possibility of using the carriers in professional practice on different machines is the perpendicularity of the recording with respect to the direction of movement of the carrier. The measuring tapes and films are made specifically for this purpose.

The perpendicularity of the recording has so far been ensured in various ways. One is the use of an optical method where, for example, the perpendicularity of the recording head slot to the edge of a standing tape or film is measured. However, the movement of the strip will change its position and thus the perpendicularity of the slot relative to the carrier will change.

Other methods are, for example, recording onto the carrier and then capturing it after inverting, by scanning the recording over the pad. Thus, the angular deviation is doubled. However, due to the distance of the active layer from the magnetic head, the recording level of shorter wavelengths is reduced and the method loses accuracy when the wavelength is increased.

Another possibility is to use a device with two magnetic heads mounted symmetrically on the cylindrical body. The measuring tape is guided to the head slits through the guide assembly

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201'181 - 2 pins. The disadvantage of this device is the necessity of securing the guide pins for both sides of the special head body to ensure the parallel position of the tape, which affects the accuracy of the device. The device has ^{also significantly} nedosteteě-setting highs, which is quite flat.

Furthermore, one ^of the ^{P dy} invention overcomes the drawback ^BC e ^d c ^h ozích. řefoní.

Its essence is that in a common body tilted perpendicular to the plane of the carrier, four mg-gutted heads are flown symmetrically. Two and two of them always lie on the opposite sides of the axis-body. Slits S ^ magrniíických ^hl and Leh ^di Ne plane to ŠTĚRBA! Us bears loop carrier, which has two parts. This width is stored in a set of ^four guides. Dv ^of from anything zaj ^h ^ íují ^b ou parallelism of ^parts of the carrier ^CKY-P ro OHA its movement direction and having a width equal to the width of the leader macimilní carrier. The other two are auxiliary guides which guarantee accurate guidance of both parts of the carrier loop to the body and are height adjustable.

By using four magnneic heads we get a much more accurate perpendicular alignment of the whole system. By locating the guides to secure both parts of the carrier spruce, there is no need for further control of this parallelism and hence the moonost error. The auxiliary guide is an exclusive error that would result from inaccurate carrier guidance.

One embodiment of the device according to the invention is in the attached drawing, 1. with a detailed view in the direction A, B.

The apparatus consists of four magnifying heads 2, 2, A and 6, which are located in a common body, tilted along an axis perpendicular to the plane of the tape, symetrically to the axis of the body. J · on one side of the axis of the body 2 are disposed magneické · ^H 2 Titles, 2 and protHehlé side rogrntacM ^hl ^ v ^y £ 2 · · ^Ste Slits Migrat ^^ ACTIVE head forms a single plane, which can be achieved by grinding them together . The device has two pairs of guides. The steering wheels 6, 2 serve to secure both sides of the carrier loop 20, 11 for both directions of movement thereof. These guides MJI width equal №1x1 ^ 111 holiday width ^U sing the ^eh · nosifo. The guides 8, 2 ensure that the carrier in the guide 6, 6 ^always runs along a defined edge. Auxiliary guides 8, 2 are adjustable in height and are set so that the carrier not ^H r ^{p and} in ^a rubbed against ^the bottom al inované ^d e ^{f h y} wounds, but show zloven nedootózelo ^would deform the edges of the carrier. The respective guides of each pair are positioned symeerically with respect to the body 2 in the direction of movement of the carrier. Closer to body 2 are guides 6, J.

The signal s · Malo wavelength is recorded on the support in parallel connection of a pair of heads 2, 2 and the body 2 ⁸ heads tilted to an axis lying in the plane of the slot heads until it reached zero phase difference overvoltages the twin heads £ and 2 · This . the device is calibrated and can be used to record a tape or film to adjust the perpendicularity of the recording device. After calibration, the device can also be darkened to measure the perpendicularity of the recording of already recorded tapes and films. For this purpose it is suitable to use phases. a meter calibrated directly at an angular deviation from the perpendicular record. The two heads 2 and 2 further serve to check the accuracy of the device. To record a recording, first the two-headed heads 2 and 2 a

201 181 by detecting the phase difference of their stresses and then without changing the position of the body J. with the head L by detecting the phase difference of the stresses of the pair of heads 4 and 2 we should receive theoretically identical deviations. 2 »ά ž imi společ ž ž ž ž ž ž ž ž ž ž ž ž ž ž imi ž imi imi m imi imi imi imi imi imi

The same guides 6 and X are used to ensure both sides of the carrier spruce 10 and 11 are parallel to each other. · Guides 6 and J a width equal to the permissible width of the carrier used · To ensure that the carrier in guides 6, one of the defined edges serves as auxiliary guides 8, 2, which are adjustable in height so that the carrier in the guides 8, J is just the lower defined edges, but to avoid meehaadic deformation of its edges.

Claims (1)

Apparatus for making grinding tapes and films for adjusting perpendicular recording on a carrier and measuring this perpendicularity in which the tape orbits a common body with mgintic heads in a spruce, characterized in that in the common ttles (1) symmetrically placed on its axis four-maanneic heads (2,3,4, 5), with dvt and dvt always lying on opposite sides of the ttles axis (1) and the slits of these magneic heads (2,3,4,5) forming a single plane and a loop of measuring tape or film is disposed in a system of four guides (6, 7, 8, 9, 9), of which guides (6), (7) serving to ensure parallelism of the two parts of the grave (10), (11) the carrier for both directions thereof having a width equal to the minimum permissible width of the carrier and auxiliary guides (8), (9) guiding both parts of the carrier loop (10), (11) to the trailer (1),. they are height adjustable.