DE2230481B2 - Device for holding magnetic tape cassettes - Google Patents

Description

TCEs naVh to claims 1 and 2, characterized in that on the support plate (9) retaining spring "are arranged (30) in the working position (Figure 3c) and in the middle, 5 position (Figure ^S 3b) of the carrier plate ( 9) rest on the top of the magnetic tape cassette (31).

4. Apparatus according to claims 1 to 3, characterized in that the movement of the cam disk (15) is transferred by a slide (18) to the carrier plate (9) on which a Roller (19) is arranged over the edge of the The cam (15) slides, and that the slide

(18) is guided in the axis of rotation of the electric motor (5) in such a way that it only has a longitudinal movement in

Direction on the carrier plate (9) _{can run} ^B

5. Apparatus according to claim 4, characterized in that the slide (18) with the carrier plate (9) connected by a spiral spring (26) 4 =

6. Apparatus according to claims 1 to 5, characterized in that the carrier plate (9) in its Working position by the spiral spring (26) rests against an adjustable stop (21) and that thereby the pressure of the pressure roller

(12) is determined against the support roller (13).

7. Apparatus according to claims 1 to 6, characterized in that the carrier plate (9) oaß against a spring force (springs 25) can be moved out of its rest position and that this The spring force is less than the force of the spiral spring (26) between the carrier plate (9) and the slide (j 8)

8. Apparatus according to claims 1 to 7, characterized in that the carrier plate (9) through a prism guide (22, 23, 24) in the base plate (1) carrying the cassette (31) perpendicular is mounted displaceably to the magnetic tape.

60

The invention relates to a device for receiving magnetic tape cassettes with one of the magnetic tape swiveling carrier plate on which the machine

65 then ge _S s the support roller

the magnetic tape ^^

when stopping the

This is done through

whose answer for «Τ ™ ^^

connected is. The more often this £ ^ S Mainet

follows, the greater the risk that the magnet

band high altitude hikes f ^ ^d " ^St _M ^ _t ^c ™ ^sf ^" and therefore not spurgetoeu on the Magnetk

added ™ ^ ^Except f _m l ^ se alht irregularities and possibly also too

Tape damage. ^, _{VtTnmaonPtpn 71ir}

The use of an electromagnet for Control of the carrier plate allows stranding same only in two positions, of which the emc then also an unlocking of the magnetic tape cassette

means if only the magnetic tape is rewound should be and * e magnetic tape cassette in the device remains. There is a risk that the cassette unintentionally jumps off the aninebs spikes of the winding motors or just jams becomes that after switching on the electromagnet again the magnetic head is no longer in true-to-track contact with the magnetic tape.

The disadvantages mentioned are particularly noticeable when a magnetic tape cassette is used as an em- and output memory of a data processing machine is used in which the individual norms in the start-stop operation of the magnetic tape taken from this or stored on it will. The electromagnet has a high power consumption and is subject to a high Wear and tear.

The invention is based on the object of avoiding these disadvantages and controlling the Carry out carrier plate with a minimum of moving parts. This is achieved in that the Carrier plate by a cam that can be controlled by an additional electric motor in several can be locked in predetermined positions. For this purpose, three positions are preferably provided, with in the middle position, the magnetic head and the pressure roller are lifted from the magnetic tape However, the magnetic tape cassette remains fixed in the inserted position. According to further training the invention for this purpose clamping springs are arranged on the carrier plate, which in the working position

3 j 4

and in the middle position of the carrier plate on the slidably connected by a prismatic guide. On top of the magnetic tape cash register. Purpose- This prismatic guide consists of the basically the movement of the cam frame 1 attached slider 22 and the slider 23 attached to the carrier plate 9 attached to the support plate by a rod and the so arranged in the axis of rotation of the electric motor 5 between the two sliders Slide or an interposed gear is guided, shaft 24. The support plate 9 is in its abgeaß it only a longitudinal movement in the direction of the pivoted position, which can then perform as a rest support plate. On this rod is called treatment, arranged by the spiral springs 25, which hold a roller over the edge of the car. On the support plate 9, the magnetic head are venscheibe slides. ₁₀ 29 and two retaining springs 30 arranged so far

For safety reasons, the carrier plate will lie above the surface of the carrier plate 9,

their rest position out against a spring force that they are in all positions except the rest position

emotional. Furthermore, between the rod and the carrier plate, on the top of the magnetic tape

there is no rigid connection of the carrier plate, but rather the cassette 31 and the latter on the support 32

this is done by a spiral spring, the spring force of which 15 presses.

is much stronger than the other on the carrier. On the underside of the carrier plate 9 is the Anpla'.te acting spring force. In the working position drive motor 10 attached, the rotor shaft through the carrier plate abuts this against an adjustable one opening of the carrier plate 9 protrudes and the Stop, which is set so that the pressure roller 12 carries. The pressure roller 12 is on Desired pressure of the pressure roller against the 20 known manner with a rubber support roller is reached. The spiral spring between the layers or consists itself of hard rubber. she is Carrier plate and the control rod has the advantage of being attached to the rotor shaft 11 and by a that tolerances are easily compensated. Cotter pin secured.

The invention is illustrated with the aid of one of the drawings. 3 a to 3 c are the three possible

25 positions of the carrier plate 9 are shown. This position

ben. It shows g _{en s} j _n d _{depending on} the shape of the cam disk 15

F i g. 1 the device for recording a magnetic gig. In Fig. 3 a is the rest position of the carrier tape cassette according to the invention in plan view, plate 9 shown. On the output axis of the gear

Fig. 2 shows the side view of the device according to F ".g. 1 bes6, the two cams 14 and 15 are loaded

partly in section and 30 consolidates. Above these cams 14 and 15

3a to 3c the top view of the device according to the slide 18 on the output axis of the gear

removed cover and partially removed bes 6 attached and secured by a locking pin 20

Base frame in rest position, middle position and in secured. The slide 18 carries on its upper one

Working position of the carrier plate. End of a roller 19, which is on the edge of the curve

The device shown in the drawings is for 35 disk 15 unrolls as soon as the servo motor engages Installation in a data processing machine, is switched. On the edge of the lower curve. B. an electronic accounting machine, thought, disk 14 slide the lever of the two micro-whereby the magnetic tape cassette as input and output switches 16 and 17, through which the respective position of the storage is used. The device consists of an upper cam 15 and thus the carrier base frame 1, which is signaled with a protective cover 2 40 plate 9. Are both switches 14 and is provided. This protective cover has a mit- 15 open, so this means the rest position of the tel opening into which the magnetic tape cassette 31 is a carrier plate 9. When the switch 16 is switched on and off can be. The whole device is opened by switch 17, the middle position and at a cover 3 is closed, which is in switches 14 and 17, which are not shown, the workstelter. however, as is known, it is indicated in the area of the magnetization of the carrier plate 9. From these tape cassette has a glass window. The cover 3 switch positions can, for example, each for can through the lock 34 with the protective cover this position required functional sequence of the device kung2 can be locked. On top of the be derived.

Vjrundrahmens 1 are three support cams 32 on- The front part of the slide 18 is U-shaped arranged, which is designed for the secure storage of the magnetic tape 50 and engages around a pin 27 on the cassette 31 serve. Furthermore, support plate 9 is attached to the top. Between this pin 27 of the base frame 1 microswitch 33 is provided, and the slide 18 is a spiral spring 26 angeorddie Detect which of the two sides of the net whose spring force is greater than the spring force Magnetic tape can be played. For this purpose, there are two spiral springs 25 in the cam known, not shown way, the 55 15 brought into the position shown in Fig. 3b, so ge-magnetic tape cassette on the rear side a gap opens the carrier plate 9 in its central position. In dation, In which the feeler lever is only one of the microswitches, neither the pressure roller 12 nor the ter 33 can intervene. On top of the basic magnetic head 29 in contact with the magnetic tape, frame 1, the support roller 13 is also fixed, but in the retaining springs 30 are now already on the rotatably arranged. 60 Top of the inserted magnetic tape cassette 31. In

On the underside of the base frame 1 are the position of the carrier plate 9, the magnet

Winding motors 7 attached with their winding mandrels 8. tape can be fast forwarded or rewound.

In addition, the base frame 1 carries information taken from the magnetic tape about distances.

sentences 4 a servomotor 5 with attached gem or recorded on this, so is the drive 6. The spacer extensions 4 provide space for 65 working positions to be taken by the carrier plate 9,

the recording of the cam disks 14 and 15 and for this purpose the servomotor 5 is switched on again

for the switches 16 and 17. and the cam 15 so far fortgedrehi until the

The carrier plate 9 is connected to the base frame 1 in FIG. 3 c position shown is reached. Before-

here, however, the carrier plate 9 strikes against the stops 21 with its front lugs. Condition the Shape of the cam disk 15 a further displacement of the slide 18, it slides within it front recess on the pin 27 and tensions the spiral spring 26. The spring force of this Coil spring 26 determines the pressure with which the pressure roller 12 is pressed against the support roller 13 will. The stops 21 are adjustable, so that the degree of deformation of the pressure roller 12 a desired value can be set. Both values are decisive for an almost slip-free Drive of the magnetic tape. Is also the axis of rotation of the pressure roller 12 compared to the The axis of rotation of the support roller 13, seen in the direction of the belt, is offset, so the contact area between Magnetic tape and pressure roller 12 further enlarged in a manner known per se.

From this described mode of operation it can be seen that the magnetic tape is almost slip-free can be moved when the pressure roller 12 is moved and not, as previously usual, the support roller 13. Such a direct drive also enables the speed of the drive motor to be kept constant more precisely 10 by a known control disk 36, which is a not shown, but known device controls for digital speed control. The control disk can also be used to more precisely Distance measurement for the magnetic tape can be used.

For this purpose 2 sheets of drawings

Claims (2)

Patent claims: 1. Device for holding magnetic tape cassettes with a swivel-away 5 Ren carrier plate on which the magnetic head and the pressure roller for driving the magnetic tape are arranged in which the magnetic tape is driven by a drive motor and at least one winding motor is driven, characterized in that the carrier plate (9) by a by an additional electric motor (5) controllable cam (15) in several predetermined Positions can be locked. 2. Device according to claim 1, characterized in that it is 15 shows that the carrier plate (9) is in its MUIdstellung can be locked, in which the magnetic head (29) and the pressure roller (12) from the magnetic tape are lifted, the magnetic tape cassette kg & L · are ^further arranged ^{in the einselegten 20} metkopf and the pressure roller, before wrzuesweiie is made of rubber and the magnetic Hand "eeeD means disposed on the base plate" ♦ ·· ♦ ° n * nreßt in which the magnetic tape by => tutzrοι ^ie PV ^; _d at least one winding an A ^ smotor moto an | ^ eb ^en ι ^ ^ ^ At ^ ™ ^ien _{d Rkrde} rn, after the ^ ^ _{carrier plate m b L} This netkopf with the magnet ^ S ^ | _nde hand, is the ma- band ™ ^Be ™ J ^ «A _nd n _ic roll against a support band ^ ^du rch ^d · e Andn gg ^ roll pressed, *? eovma & r Electric motor direct or mdirekt ™ ^e ™ "°« Windingjotore about e ^ n ^ mebsneme ^ an ^ tne_ ben will be Wanrena uic or similar elastic material MJJ die in diameter wesenthchkta "^