DE1028798B - Drive arrangement for devices for sound recording and reproduction, in particular magnetic sound devices - Google Patents

Description

GERMAN

The invention relates to a drive arrangement for devices for sound recording and reproduction, in particular magnetic sound devices with winding and unwinding reels arranged one above the other and separate or common motorized drive for the sound reel and the sound carrier reels, whereby for Bridging the height difference between the superimposed sound carrier reels the tape guide and drive elements and the magnetic heads are arranged at an angle to the tape reels.

Magnetic sound devices with superposed take-up and unwinding reels for the sound carrier have the advantage of much less space required compared to the usual devices with adjacent coils. With these devices, however, it is more difficult to guide the sound carrier from the lower to the upper reel, since a certain height difference has to be overcome over a relatively short distance. The sound carrier must not be damaged in the process. It must therefore be proceeded very carefully, especially when using tape-shaped sound carriers, so that the tape is not stretched excessively and thereby tearing prematurely or distorting the sound reproduction.

Drive arrangements for devices of this type with superposed coils have already been proposed with two large pulleys for the transition from the lower to the upper coil at an angle placed are arranged, while the magnetic heads and the sound carrier pulling tape roll vertically stand. The tape roll is arranged between the reels on their axis of rotation. This design is conditional a very cumbersome tape guide with additional smaller pulleys. The tape is also very difficult to insert due to the numerous guide elements and is also additionally due to the same claimed.

In other arrangements, it was again proposed to have a pulley perpendicular to the height of the supply reel and to arrange the other roller and the clay roller with the pressure roller at the height of the take-up reel. The band is then rotated by 90 ° between these halls and at the same time inclined guide organ, on which also the magnetic heads for recording, playback and deletion are appropriate. This causes the tape to move off the first pulley after it has run out rotated by 90 ° by the guide member, d. H. brought into a horizontal position, and then runs through there;·. Guide organ directed obliquely upwards to the Magnet heads over. After leaving the guide organ, it is through the clay roller and the pressure roller not only pulled, but also rotated 90 ° back into the vertical position. This two-time Ver-drive arrangement for devices

for sound recording and reproduction, in particular magnetic sound devices

Applicant:
North German Mende-Rundfunk GmbH,

Bremen-Hemelingen,
Diedrich - Wilkens - Str. 39/45

Dipl.-Ing. Gottfried Hentschel, Bremen-Lesum,
has been named as the inventor

rotation of the belt by 90 °, which also happens under strong tension, affects its service life unfavorable, since the edge zones of the tape are greatly stretched and there is thus an increased risk of tearing.

In a known tape drive, the characteristic feature of which is in the form of a spiral spring trained device to achieve sufficient belt tension between the upper and lower tape reel and to compensate for the speed difference between these two reels to the subject both the tape pulleys and the tape drive pulley are with the motor as well the magnetic heads are shown inclined to the tape reels. Compared to the known arrangements at which the difference in height between the supply and take-up spool over several pulleys and also must be caused by tape rotation, offers the simple inclination of the conductor organs without complicated Diversion paths have significant advantages. Namely, the tape is through the first and the second Deflection pulley rotated only a very small amount, which avoids additional stress on cracks. The tape is also easier to insert if it is not threaded into a complicated roller system got to. In the case of the last-mentioned drive arrangement with the obliquely positioned deflecting rollers, one is the deflecting roller at the same time also the drive roller for the tape.

The inclined installation of the drive motor has disadvantages, which are not only of a technical installation nature, but also have an adverse effect on the smoothness and the Bearing load on the motor, with the latter aspect in the case of a tape drive in the Pay particular attention to the interest of a flawless playback quality of the tape recorder in question.

809 507/175

must be respected. Furthermore, it is inexpedient to drive the tape at a deflection point because it it is precisely at these points that the twisting itself is already more heavily loaded.

With the drive arrangement according to the invention, the shortcomings of the known devices are thereby eliminated fixed that the drive motor for the tape roll is installed vertically in the device housing and over a crossed cord or belt drive or an angle drive with a flexible shaft, cardan joints Od. Like. Is in drive connection with the inclined sound roll, the sound roll with the Tape guide organs and the magnetic heads are arranged on a common inclined bridge. This arrangement has the advantage that the bearing is less stressed due to the vertical motor axis and the engine runs more smoothly. In addition, the motor can be better and more space-saving in a vertical position build in. By its from the assembly bridge for the tape licking and drive organs and the magnetic heads separate arrangement, the handling during assembly and the adjustment of these parts is also easier and more manageable than in connection with the heavy engine. Furthermore, the vertical arrangement of the Drive motor still has the advantage that in this housing position drive connections to other devices of the device, for example the tape reels, are easier to manufacture.

According to a further embodiment of the invention, the pulleys are arranged laterally so that their overrun or drainage area approximately in the middle between the outer and inner diameter of the largest tape reels that can be played with the device. This is therefore advantageous to protect the belt, because as a result, the angle of wrap of the tape slightly canted on the pulleys Unwinding or winding only within moderate limits from the right-angled central position, which is for the Operation is cheapest. Furthermore, at the points where the tape from the horizontal in the "inclined position and from the inclined position again merges into the horizontal position, loosely moving Leitoder Deflection rollers are provided, and the audio roller that drives the tape is arranged just in front of the guide roller, from which the tape runs onto the take-up reel. This will keep the tape at the deflection points not additionally burdened.

An embodiment of the invention is shown schematically in the drawing and explained in more detail.

In Fig. 1 1 and 2 are the superimposed tape reels, which on an axis 3 in are attached in the usual way. The tape on the reel 1 below (supply reel) 4 is pressed during operation of the device by the pressure roller 5 against the sound roller 6 and from this via the loosely rotating pulley 7 in the direction of the arrow on the magnetic heads 8 for recording, Playback and deletion past and around the running pulley 9 to the overhead reel 2 (take-up reel) transported. As can also be seen from the drawing, the pulleys 7 and 9 are the magnetic heads 8 and the sound roller 6 with its pressure roller 5 on a common, inclined bridge 10 arranged, which is attached to the device base plate 11. This makes the tape 4 easier Way inevitably and without additional deflection means and paths from the lower reel 1 (supply reel) transported to the upper reel 2 (take-up reel) and wound up there. The pulleys 7 and 9 are arranged so that their run-up or drainage surface approximately halfway between the outer and inner diameter of the largest tape reel that can be played with the device. The drive motor 12 is arranged so that the motor axis stands perpendicular. How it can be connected to the belt drive is shown in the schematic representation according to FIG FIG. 2, viewed from the right-hand side of the illustration according to FIG. The clay roller 6 is standing obliquely and carries a belt or cord pulley 13 and on its extension designed as a shaft 6a a flywheel 14. The drive motor 12 carries a small pulley or cord pulley 15 and is perpendicular arranged upright at a suitable point in the device housing. The drive connection to the drum 6 is made by a belt 16, with which also in a simple way the angular position between the inclined sound roller 6 and the perpendicular drive shaft of the motor 12 is bridged. If now a connection as rigid as possible between the clay roller 6 and the drive motor are to be provided, this can be done via a flexible shaft small universal joints or other suitable angular drive elements happen.

Claims (3)

Patent claims: 1. Drive arrangement for devices for sound recording and playback, in particular magnetic sound recorders, with one on top of the other Take-up and take-off reel and separate or joint motorized drive for the clay reel and the sound carrier reels, in order to bridge the height difference between the superimposed Sound carrier reels the tape guide and drive elements as well as the magnetic heads are arranged at an angle to the tape reels, characterized in that the drive motor (12) for the clay roller (6) is perpendicular in the device housing is installed and via a crossed cord or belt drive (13, 15, 16) or via an angular drive with a flexible shaft, cardan joints or the like with the sloping clay roller (6) is in drive connection, the sound roller (6) with the band members (7, 9) and the Magnetic heads (8) are arranged on a common inclined bridge (10). 2. Drive arrangement according to claim 1, characterized in that the guide rollers (7, 9) provided as guide elements are arranged on both sides of the inclined bridge (10) so that their run-up or run-off surface is approximately in the middle between ^{1 and} the outside - and the inside diameter of the largest tape reels that can be played with the device. 3. Drive arrangement according to claim 1 and 2, characterized in that at the points where the tape (4) from the horizontal to the inclined position and from the inclined position. merges into the horizontal position, loose idler rollers (7, 9) are provided and the audio roller (6) driving the tape is arranged just in front of the guide roller (9) from which the tape runs onto the take-up reel (2). Documents considered: German Patent No. 816 312; .. Austrian patent specification No. 126 661. 1 sheet of drawings © »09 507/175 4.