DE6916681U - PLAYBACK DEVICE FOR TAPE-SHAPED RECORDING MEDIA - Google Patents

Description

playback device for tape-shaped recording media

The innovation relates to a playback device for tape-shaped recording media, in particular a microfilm reader « with adjustable tape speed in the forward and backward transport, with the recording medium in place the transmission of their recordings to the playback device run through between holes arranged parallel to the direction of transport, their mutual spacing is changeable.

Such playback devices are known. The variable transport speed for the recording medium is used in the Slowly looking for a certain recording, at high speed quickly transporting long pieces of the recording tape between records that are far apart on the carrier tape and the rewinding of the tape.

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In the case of projection devices, the recording medium runs in the area of the image stage between perforated porch parts so that the recording to be projected lies exactly in the focal plane of the projection lens and is shown in focus. These guide parts generally consist of two glass plates which are arranged so that they can be moved automatically against one another in such a way that they hold the pieces of pilm, which are gradually brought into the projection position, pressed between them in the plane of the lens, but when the film is being transported they diverge in order not to damage the recording medium, for example by Scratching of the surface layer. Such a periodic change in the distance of the glass guide plates with each film transport step from one image to the next causes, on the one hand, a temporary blurring in the projection image every time. These deficiencies are felt to be very annoying, particularly in the case of reading devices for micro-images documented on film rolls. Fixing them 1st task of the innovation.

According to the innovation, this object is achieved in that the Changes in the spacing of the guide parts in the area of the picture stage by changing the position of the belt speed adjuster take place. In the design of the innovation is considered special

Advantageously suggested «that the belt velocity adjuster only when a defined position change range for slow transport speeds is exceeded acts to keep the distance between the guiding parts » the risk of scratching remains for the wearer in the case of slow transport movement «the user is given at least an orienting recognition of the The contents of the passing recordings are allowed to be "low", while with increasing transport speed, in which the user's eye no longer fails to see any of the recorded information " increases significantly.

On the basis of the drawing "in which an exemplary embodiment, Especially for a reader for film rolls with micro images « sohematically presented is the innovation described later. Be show

VIg. 1 a new meeting of the Sohwenkmeohaniamus füf the guide plates with lifting magnets / i in rare » opinion.

Flg. 2 a plan view of the swing mechanism must figure 1 in conjunction with a rotary knob trained belt speed adjuster,

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In the area of the image window (not shown) of a reading device, two oil plates 2 and 3 are provided, between which the film 1 is moved. The plate 2 is stationary «the plate 3 is arranged to be pivotable. The bolt 4 of the two-armed lever 7, 7a rests on the latter, the arm 7a of which is acted upon by the force of a tension spring 6 and rests on the armature 14 of the electromagnet 15. The magnet 15, which is described in Pig. 1 in the excited state, that is, with the attracted; Armature 14 is shown, is connected via lines 16 and 17 to the power source 18 and to the conductor tracks 12 and 13. The conductor tracks 12 and IJ are arranged in the shape of a circular arc in the rotary area of a switching arm 11. The switching arm 11 is attached to the rotary knob 8, which, apart from the punctures described here, also serves as a speed adjuster for film transport in a manner known per se.

If the speed setting is 8 »which is located on the front of the reader may be, from its rest position shown in Fig. 2 for the forward or reverse port of the film 1 rotated approximately 45 ° from its zero position to the right or left, it then places the transport device * B speeds in the range of slow gear. The conduction pathways 12 and 13 remain without a conductive connection.

The magnet 13 remains without current, so its armature has fallen off. As a result, the tension spring 6 can act on the angle lever 7a «7» so that the bolt 4 the disc 3 of the disc 2 printed on the opposite side. This ensures that the film 1 runs in the plane of focus of the projection lens. In order to relieve the film 1 of the contact pressure of the disc 3, a spacer film 5 Ewlsohen the discs 2 and 3 is provided below the film run area.

But now the oeso speed adjuster 8 is in the range of the express transports brought * the about Im Drehwinkelbereloh should be between 45 ° and 90 ° »this is how the holding arm represents 11 establishes an electrical connection between the conductor tracks 12 and 13 so that the magnet 15 and its armature are excited 14 is tightened. As a result, as shown in FIG. 1, " the lever arm 7a is raised against the force of the peder 6 and the plate 3 is raised to pivot away from the plate 2 by the bolt 4 been released. To swivel open the plate 3 for free To ensure passage of the film 1, two conical bolts 10 are on both sides of the plates 2 and 3 in such a way. brought that they are pressed at inclined points of the plate edges between them by means of springs.

When turning back the speed adjuster 8 falls when sweeping over the switching angle range between overdrive

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and slow movement at about 45 ° the magnet armature U ab «the bolt 4 on the lever arm 7 presses the glass plate J against the plate 2 again, and the laterally attached tapered bolts 10 are pushed back, so that the above-described state of the overall device for slow movement is restored.

Claims (7)

• * ■ t Kodak Aktiengesellschaft Stuttgart-Wangen Hedelfinger Strasse 54, 60 and 70 July 16, 1969 Pat. Me / Du File number: G 69 16 681.0 7101 New claims for protection 1. Playback device for tape-shaped recording media, in particular microfilm reader, with adjustable belt speed in forward and backward transport, the recording media at the point of transmission of their recordings to the reproducing device pass between guide parts arranged parallel to the transport direction, their mutual spacing is changeable, characterized in that the belt speed adjuster with the guide parts directly or via intermediate links in connection and the changes in position of the manually movable belt speed adjuster change the distance between the guide parts. 2. Playback device according to claim 1, characterized in that • »t t that only when a specified one is exceeded Position change range for slow speeds of the belt speed reference Guide parts change their distance. 3. Playback device according to claim 1 and 2, characterized in that that the belt speed is 5 ^ 1 | iifaF is designed as a rotary knob (8), which is within g # * white rotation angle ranges as a handle ze distance changes the guide parts (2, 3) are used. 4. Playback device according to claim 1 to 3, characterized in that the guide parts consist of a stationary (2) and a pivoted plate (S) made of transparent material. 5. Playback device according to claim 1 to 4, characterized in that the rotary knob (β) with a switching arm (11) is provided which is within certain rotation angle ranges the end contacts of two electrical conductor tracks (12, 13) connects to one another and so the Excitation circuit (16, 17, 18) of an electromagnet (15) closes its armature directly or via intermediate links with the movement mechanism of the pivoted Plate (3) is in mechanical operative connection. 6915681 Ml Il 111 t · · 6. Playback device according to claim 1 to 5, characterized in that between the magnet armature and an angle lever (7, 7a) is arranged on the pivotably mounted plate (3). 7. Playback device according to claim 1 to 6, characterized in that the side of the guide plates (2, 3) spring-loaded conical bolts (10) are arranged, which after the magnet armature has been tightened (14) open the guide plates (2, 3). HlnW «i« l O. «-. · Untwtinj * fflunhmhiini) iintf 8-Aul» <«Wpf.) Isl 4 * / wielil * ing * /» ichte, Um - «Ait! vofl do »· V taMtBWS ft «r ifcHninoVh φη -; ** ' -Μ«: ι \ IV *' - .VW. <> · ■> Of · f * i # n * ι «·.» »«. · «, .i>, .- * λ .jii. ^ iT.K: · β <η9« «ΐΜ ·» «« μ. On Afltrui * »ι * η hwfwn otfc # ΛΑΑορΙβη or FHm- 6915681 , I g.-. ^ . ——- —— - , .- -i