Loading mechanism for loading and unloading an information disc into / from an information-technology apparatus

Description

The description is 14 pages long (including 6 pages of illustrations). HU 220 927 Bl The invention relates to a feeding device for feeding and ejecting an information carrier disc into and out of an information technology device. This device comprises a first guide and a second guide. Each guide has a groove for the edge of the disc. The second guide is designed as a rotatably driven conveying wheel, which rolls the information carrier disc into the device for feeding and ejecting. Such a feeding device is known from US-PS 5,163,040. In this known feeding device, the information carrier disc is guided on one side by a rigid, curved and grooved guide element as a first guide and on the other side by a concave feed wheel as a feed guide. The device has an inclined pressure side relative to the feed plane. The feed plane is the plane in which the first and second guides roll the information carrier disc into the device. When the information carrier disc is introduced into the device, it is manually inserted into the feed slot of the device and brought into contact with the groove of the first guide and the feed wheel. The feed wheel is driven by a motor during the feeding process, and the information carrier disc rolls into the device along a curved feed path between the feed wheel and the first guide. The groove of the first guide and the feed wheel is V-shaped. However, this type of construction has several disadvantages. Due to the use of the curved first guide, the information carrier disc can only be fed into the device via a curved feed path, via the first guide. A straight feed path is not possible. Compared to a straight feed path, curved feed path requires a larger width for the feed mechanism and, consequently, for the device. This is particularly disadvantageous when the device is used in a car, since the space available for installing the device is limited. Information-carrying discs usually have a central locating hole. In order to avoid damage to the disc surface, it is advantageous if the user only touches the edge of the locating hole and the peripheral edge of the information-carrying disc. In the known arrangement, the center of the information carrier disc must be manually inserted at least to the center of the feed wheel - hereinafter referred to as the intermediate position - in order for the feeding device to automatically take over the information carrier disc. In this intermediate position, the positioning hole is no longer outside the front of the housing of the device, and the user cannot hold the information carrier disc in the desired manner - by holding it at the edge of the positioning hole and the peripheral edge of the information carrier disc. As a result, the user is forced to touch the surface of the information carrier disc to bring it into the intermediate position. This causes increased wear of the information carrier discs. The aim of our invention is to design a retracting mechanism of the type described in the introductory paragraph in such a way that its dimensions are minimal and that it enables the information-bearing disc to be retracted and extended without touching its surface. This object is achieved according to the invention in that the first conductor and the second conductor are movably supported; the groove of the first conductor and the groove of the second conductor each have a pressure side inclined relative to the drawing-in plane; the groove of the first conductor and the groove of the second conductor each have an inner surface substantially perpendicular to the drawing-in plane; and the corresponding inner groove height is selected to be smaller than the thickness of the information-bearing disc in such a way that the outer peripheral edge of the information-bearing disc does not contact the inner surfaces of the grooves during the drawing-in process. The movability of the support line and the feed line allows these lines to move in accordance with the contour of the information carrier disc and thus guide the edge of the information carrier disc flexibly. This allows the information carrier disc to be inserted in essentially arbitrarily definable feed paths. With such a feed device, information carrier discs can also be rolled into the device whose disc edge is not circular (for example, having an oval or other shaped disc edge). The movability of the first line and the second line can be realized by various designs. The first line and the second line can be guided, for example, in guide grooves and pressed against the disc edge of the information carrier disc by spring force or actuating elements in these guide grooves. The first line and the second line can also be placed on rotating arms which are supported at one end. The grooves of the first and second conductors are essentially V-shaped with their bottom truncated, with at least one side being inclined relative to the insertion plane and consequently having at least one inclined pressure side for the information carrier disc. During the insertion process, the first and second conductors are pressed against the edge of the information carrier disc. The direction of the force exerted on the information carrier disc by the inclined pressure sides is then perpendicular to the insertion plane. The internal height of the groove, i.e. the height of the groove on the inner peripheral surface of the groove, is selected to be smaller than the thickness of the information carrier disc. If the insertion device is to be used for inserting information carrier discs of different thicknesses into and out of the information technology device, the height of the groove is selected to be smaller than the thickness of the thinnest information carrier disc.This ensures that the outer edge of the information carrier plate does not come into contact with the inner edges of the grooves during insertion. The information carrier plate only comes into contact with the grooves at points at the inclined pressure sides. Compared to an AV-shaped groove, this V-shaped groove, which is essentially cut off at the bottom, has the advantage that the angle of inclination of the pressure sides can be much smaller. This has the advantage that the indentation on the surface of the information carrier disc at the place of the pressure sides is reduced. HU 220 927 Bl si plane, the force exerted in the direction perpendicular to the plane increases significantly. In addition, the V-shaped groove cut at the bottom may have a much smaller depth in the direction of the indentation plane, given the same thickness of the information-bearing disc. In a further preferred embodiment of the invention, the groove of the first conductor and the groove of the second conductor each have a pressure side which is inclined with respect to the retraction plane on the upper side and the lower side of the groove. With a groove of this shape, a force perpendicular to the infeed plane can be exerted on the surface of the information carrier disc both from above with the pressure side on the upper side and from below with the pressure side on the lower side. In another preferred embodiment of the invention, the information carrier disc is held in the grooves of the first conductor and the second conductor. The pull-in device according to the invention enables this clamping to be achieved satisfactorily by means of a V-shaped groove cut off substantially at the bottom. Since the angle of inclination of the pressure sides can be chosen to be very small, the force which can be exerted on the surface of the information carrier disc perpendicular to the pull-in plane at the location of the pressure sides is very large, and thus an effective clamping effect can be achieved. In yet another preferred embodiment of the invention, in the ejection position, the information carrier disc is held in the grooves of the first guide and the second guide in such a way that the user must exert a force of at least 0.7 N to manually pull the information carrier disc out of the grooves. In the extended position, the first wire and the second wire press the surface of the information carrier disc with their pressure side, hold the disc firmly and thus prevent the information carrier disc from accidentally rolling out of the device. In order to remove the information carrier disc from the device, the user must pull the information carrier disc outwards from the grooves of the first wire and the second wire with a force of at least 0.7 N. This minimum force is particularly advantageous if the retracting device is used in an information technology device in a car. This minimum force then ensures that the information carrier disc does not come out of the device due to impacts during driving, for example on uneven roads. In another preferred embodiment of the invention, the first conduit comprises a support segment. In a preferred variant of this embodiment, the pressure sides of the first conduit have a bevel angle of between 4° and 8°, and the pressure sides of the second conduit have a bevel angle of between 3° and 7°. This choice of the inclination angles of the pressure sides has proven to be very favorable. If the inclination angle of the pressure sides is greater than 7° or 8°, then the normal force that can be exerted on the surface of the information carrier disc at the location of the pressure sides is very small. If the inclination angle is chosen to be less than 3° or 4°, then the retractor becomes very sensitive to the thickness tolerances of the information carrier disc for a given radial groove depth. The angle of inclination of the support segment is preferably greater than the angle of inclination of the pressure sides of the transport wheel, because the transport wheel actively drives the information carrier disc, while the support segment provides passive support. In a still further preferred embodiment of the invention, the first conduit comprises a rotatably driven conveying wheel. If both the first and second conductors comprise rotatably driven feed wheels, the information carrier disc can be inserted into and removed from the apparatus without the information carrier disc itself rotating. If the geometric dimensions of the groove of the first conductor and the groove of the second conductor are exactly the same, the information carrier disc enters and exits the apparatus without self-rotation, provided that the feed wheel of the first conductor and the feed wheel of the second conductor rotate in opposite directions at the same speed. In yet another preferred embodiment of the invention, the elastic modulus of the pressure sides is greater than the elastic modulus of the information carrier plate; the surface roughness of the pressure side is such that the information carrier plate is pressed against the pressure sides of the groove with such force that a frictional contact exists between the surface of the information carrier plate and the pressure sides during the insertion process. In this preferred embodiment of the invention, the surface has a given roughness. Since the elastic modulus of the surface is greater than the elastic modulus of the information carrier plate, the surface of the information carrier plate is partially connected to the rough pressure sides, and thus a frictional connection is established between the surface of the information carrier plate and the pressure sides. In yet another preferred embodiment of the invention, the material of the conveying wheel is steel, and the steel is coated with a chromium carbide layer at least at the pressure sides. The basic profile of the conveyor wheel can be turned from steel, for example. This turned steel conveyor wheel is provided with a chromium carbide layer on each pressure side. Chromium carbide has a very high hardness, and with a suitable composition it can reach a Vickers hardness of over 800. Chromium carbide has a very high modulus of elasticity, reaching values ​​of over 300 GPa. In addition, chromium carbide has very good adhesion to polycarbonate, from which information-carrying discs are produced according to the compact disc standard. Due to the high hardness of the chromium carbide layer, the wear of both the chromium carbide layer and the surface of the information carrier plate is very low. Due to the good adhesion between the chromium carbide and the polycarbonate, very high static friction forces are generated between the surface of the information carrier plate and the chromium carbide pressure sides, and as a result, high tensile and holding forces can be exerted in the direction of the retraction plane. Due to the high modulus of elasticity of the chromium carbide layer, the surface of the information carrier plate is partially connected to the rough surface of the chromium carbide layer, and thus a frictional connection is created. HU 220 927 BI In a further preferred embodiment of the invention, the base material of the conveying wheel is steel, and the steel is coated with a tungsten-carbon-hydrogen layer at least at the pressure sides. The basic profile of the conveyor wheel can be turned from steel, for example. This turned steel conveyor wheel is provided with a tungsten carbide layer on each pressure side. Tungsten carbide has a very high hardness and, with a suitable composition, can reach a Vickers hardness of over 800. Tungsten carbide has a very high modulus of elasticity, reaching values ​​of over 300 GPa. In addition, tungsten carbide has very good adhesion to polycarbonate, from which information-carrying discs are produced according to the compact disc standard. Due to the high hardness of the tungsten-carbon-hydrogen layer, the wear of both the tungsten-carbon-hydrogen layer and the surface of the information carrier plate is very low. Due to the good adhesion between the tungsten-carbon-hydrogen and the polycarbonate, very high static friction forces are generated between the surface of the information carrier plate and the tungsten-carbon-hydrogen pressure sides, and as a result, high tensile and holding forces can be exerted in the direction of the retraction plane. Due to the high modulus of elasticity of the tungsten-carbon-hydrogen layer, the surface of the information carrier plate is partially connected to the rough surface of the tungsten-carbon-hydrogen layer, and thus a frictional connection is created. In a further preferred embodiment of the invention, the base material of the first conductor is steel, and the steel is coated with a layer of chromium carbide or tungsten carbide at least at the pressure sides. With this structure, the favorable characteristics of the chromium carbide or tungsten carbon-hydrogen layer are utilized in both the first wire and the second wire. In a further preferred embodiment of the invention, the maximum surface roughness Rt of the printing sides is between 2 pm and 15 pm and the arithmetic average roughness Ra is between 0.2 pm and 1.5 pm. If the arithmetic average roughness Ra is greater than 1.5 pm, the surface roughness distribution is too uneven and the force exerted on the surface of the information carrier disc by the pressure sides fluctuates locally. This can result in uneven rolling of the information carrier disc and in particular in jerky sliding. If the surface roughness Rtmax of the pressure sides exceeds 15 pm, the surface of the information carrier disc is heavily worn and the surface coating of the information carrier disc is rubbed off. If the surface roughness Rtmax of the pressure sides is less than 2 pm, the static friction between the pressure sides and the surface of the information carrier disc will be very small, as a result of which the force that can be exerted on the information carrier disc in the infeed plane will be too small. The chromium carbide layer or the tungsten carbon-hydrogen layer is preferably applied by a vapor-phase coating process. The advantage of the vapor-phase coating process is that the chromium carbide or the tungsten carbon-hydrogen adapts to the surface structure of the steel. If the steel is provided with the desired surface roughness at the pressure sides, this surface roughness is retained after the chromium carbide layer or the tungsten carbon-hydrogen layer has been applied by vapor-phase. Chemical vapor deposition (CVD) is a particularly suitable vapor-phase coating process for the chromium carbide layer, while physical vapor deposition (PVD) is a particularly suitable vapor-phase coating process for the tungsten carbon-hydrogen layer. The retracting device according to the invention can be advantageously used in a deck, an information technology device containing a deck, or a car radio containing a deck. Our invention is described in more detail with reference to its exemplary embodiments with the help of our drawings, of which the Figure 1 shows a first embodiment of a drawing device for drawing an information carrier disc into and out of an information technology device, in which the drawing device comprises a hollow holding segment as a first guide, a hollow conveying wheel as a second guide for the edges of the information carrier disc, and is in an extension position in which the information carrier disc is held in the grooves and the disc is held stably by the guides, which allows the user to remove the disc manually, Figure 2 shows the insertion device according to Figure 1 in an intermediate position, in which the user has inserted the information carrier disc to the point where the insertion device automatically takes over the further insertion of the information carrier disc, Figure 3 shows the drawing device according to Figure 1 in the rolling position, with an information carrier disc completely rolled in a first rolling direction, Figure 4 is a cross-section of the steel conveyor wheel of the second line, Figure 5 is a cross-section of the steel conveyor wheel of the second line, in which the steel is coated with a chromium carbide layer at the groove location, Figure 6 is a cross-section of the steel support segment of the first conductor, in which the steel is coated with a chromium carbide layer at the groove location, Figure 7 shows the interaction of the first wire support segment and the second wire transfer wheel with the information carrier disc during the pulling-in process, when the information carrier disc is held in the grooves of the transfer wheel and support segment but does not contact the inner sides of the grooves, Figure 8 is a top view of a second embodiment of the retractor, in which both the first wire and the second wire are included HU 220 927 BI has a transport wheel and the retractor is in an extended position, in which the information carrier disc is held in the grooves and held stably by the leads so that the user can remove it manually. A first embodiment of the feeding device according to the invention is shown in the extended position in FIG. 1. The feeding device is arranged in the housing 1. The feeding device serves to feed the information carrier disc 2 into the housing 1 via the straight feeding path 4 in a first feeding direction 5 and to remove the information carrier disc 2 via the straight feeding path 4 in a direction opposite to the first feeding direction 5. The information carrier disc 2 has a circular peripheral edge 2a and a circular locating hole 3 which has a rim 3a. The housing 1 has a front wall 6a, a rear wall 6b and two side walls 6c and 6d, as well as a bottom plate 6e and a cover plate 6f. A pivot pin 8 is fixed on the bottom plate 6e, near the side wall 6c. A first rotatable arm 7 can be rotated about the pivot pin 8. A pivot pin 10 is fixed on the bottom plate 6e, near the side wall 6d, about which a second rotatable arm 9 can be rotated.The first rotatable arm 7 carries a lever pin 11 and a support segment 12 with a groove 13 as a first guide. The second rotatable arm 9 carries a lever pin 14. A transmission wheel 16 is mounted on the second rotatable arm 9 so that it can rotate around the pin 17. The transmission wheel 16 has a groove 18. The motor 19 is fixed on the bottom plate 6e of the housing 1, the shaft 19a of which carries a worm wheel 20. The motor 19 can be operated in two directions. The worm wheel 20 drives the gear wheel 21, which is rotatably mounted on the pin 21a carried by the bottom plate 6e. The gear wheel 21 is connected to the gear wheel 22, which is rotatably mounted on the pivot 10 of the second rotatable arm 9. The second gear 22 is engaged with the third gear 23 which is rotatably mounted on a pin 23a on the second rotatable arm 9. The third gear 23 is engaged with a toothed ring 24 on the lower transmission wheel.Thus, the conveying wheel 16 can be driven in two directions by the motor 19, the shaft 19a, the worm wheel 20, the first gear 21, the second gear 22 and the third gear 23. A T-shaped coupling rod 26 has a first coupling rod groove 27 perpendicular to the first retraction direction 5, a second coupling rod groove 28 perpendicular to the first retraction direction 5, a first coupling rod pin 29 and a second coupling rod pin 30. The first coupling rod pin 29 and the second coupling rod pin 30 engage in a housing cover groove 31 formed in the cover plate of the housing 6f and located in the first retraction direction 5. The lever pin 11 of the first, rotatable arm 7 engages in the first coupling rod groove 27, and the lever pin 14 of the second, rotatable arm 9 engages in the second coupling rod groove 28. The first, rotatable arm 7 is biased around the pivot pin 8 in the direction indicated by arrow 32 by a spring (not shown). The second, rotatable arm 9 is biased around the pivot pin 10 in the direction indicated by arrow 33 by a spring (not shown). It is also possible that only one of the rotatable arms is biased. The rear wall 6b of the housing 1 carries two stops 34 and 35. The side wall 6c of the housing 1 carries an auxiliary guide 36. This auxiliary guide 36 has a lower support surface 36a located in the retraction plane 25 and an upper guide surface 36b located in the retraction plane 25. The retraction plane 25 is the plane in which the information carrier disc 2 enters the apparatus in the first retraction direction 5. This plane is defined by the XY coordinate axis in FIG. 1. In the first retraction direction 5, the upper guide surface 36b is longer than the lower support surface 36a. In the extended position shown in Figure 1, the user has manually brought the information carrier disc 2 into contact with the groove 13 of the holding segment 12 and the groove 18 of the additional wheel 16. For this purpose, the user holds the information carrier disc 2 by its peripheral edge 2a and the edge 3a of the locating hole 3. The information carrier disc 2 held in this way is moved from the extended position shown in Figure 1 to the intermediate position shown in Figure 2. During the movement from the extended position shown in Figure 1 to the intermediate position shown in Figure 2, the first rotatable arm 7 rotates about the pivot pin 8, and the second rotatable arm 9 rotates about the pivot pin 10. The user exerts the necessary rotational force for this. The information carrier disc 2 is then guided laterally on one side by the groove 13 of the holding segment 12 and on the other side by the groove 18 of the conveying wheel 16. The user does not touch the surface of the information carrier disc 2. In the intermediate position of the feeding device shown in Figure 2, the information carrier disc 2 protrudes from the front wall 6a of the housing 1 of the feeding device by approximately two-thirds of the diameter of the information carrier disc. A switch plate 38 can be mounted on the front wall 6a of the housing 1, as shown in Figure 2. The switch plate 38 can be, for example, the switch plate of a car radio that records information onto and / or plays back information from the information carrier disc. The insertion hole of the information carrier disc 2 protrudes from the front side 38a of the switch plate 38. Thus, the user can hold the information carrier disc 2 at the edge 3a of the insertion hole 3 and the peripheral edge 2a of the information carrier disc 2 in this intermediate position. When the user has inserted the information carrier disc 2 into the device to the intermediate position, the motor 19 receives voltage via a switch (not shown) and the retracting mechanism automatically performs the retracting process. The switch can be, for example, a mechanical switch or an optical switch (photocell). The motor can also be started earlier. The motor 19 then starts to rotate and the conveying wheel 16 is driven clockwise by the shaft 19a, the worm wheel 20, the first gear 21, the second gear 22 and the third gear 23. The conveying wheel 16 rotating clockwise then exerts a tangential force on the peripheral edge 2a of the information carrier disc 2. HU 220 927 Bl As a result, the information carrier disc 2 held between the holding segment 12 and the conveying wheel 16 is automatically rolled into the housing along a straight infeed path 4. The first rotatable arm 7 then rotates about the pivot 8 and the second rotatable arm 9 rotates about the pivot 10. In Fig. 3 the feeding device is shown in the rolling position, in which the information carrier disc 2 has moved in the first feeding direction 5 up to the stops 34 and 35. The transfer wheel 7 and 9 below the levers and the holding segment 12 have rotated away from the peripheral edge 2a of the disc, and the lower holding surface 36a of the auxiliary guide 36 no longer acts on the information carrier disc 2, so that it can be lowered with its locating hole 3 by a lowering device (not shown) onto the gripping device 40 of the disc platter 41 shown in the figure into the playback position (not shown). In this playback position (not shown), the information carrier disc 2 is rotated by the disc platter 41, which is driven by a drive device (not shown), and the information stored on the information carrier disc 2, such as music information, can be played back. The transfer from the intermediate position shown in Figure 2 to the rolling position shown in Figure 3 is described in detail below. The clockwise rotating conveying wheel 16 exerts a tangential force on the peripheral edge 2a of the information carrier disc 2. As a result, the information carrier disc 2 held between the holding segment 12 and the conveying wheel 16 rolls into the housing 1 in the first retraction direction 5 along the straight retraction path 4. While the information carrier disc 2 moves from the intermediate position to the playback position, the peripheral edge 2a of the information carrier disc 2 is partially guided by the auxiliary guide 36, which, in addition to the holding segment 12 forming the first guide and the conveying wheel 16 forming the second guide, ensures better guidance of the information carrier disc 2. On the first guide part 42 of the auxiliary guide 36 shown in Figs. 2 and 3, the edge of the information carrier disc 2 is guided by both the lower supporting surface 36a and the upper guiding surface 36b of the auxiliary guide 36. On the second, 43, conductor part of the auxiliary conductor 36, the information carrier disc 2 is guided by only the upper, 36b, conductor surface of the auxiliary conductor 36.While the information carrier disc 2 moves in the first retraction direction 5, a rolling action takes place in the straight retraction path 4 such that the first coupling rod pin 29 and the second coupling rod pin 30 are guided in the housing cover groove 31 in the first retraction direction 5. The retraction process in the first retraction direction 5 is completed by the information carrier disc 2 hitting the stops 34 and 35 on the rear wall 6b of the housing 1. When the information carrier disc 2 hits the stops 34 and 35, a drive mechanism (not shown) is activated in a manner not shown. This mechanism acts on the first rotatable arm 7 in such a way that this arm rotates clockwise about the pivot pin 8, and on the second rotatable arm 9 in such a way that this arm rotates counterclockwise about the pivot pin 10. As a result, the groove 18 of the conveying wheel 16 and the groove 13 of the holding segment 12 are separated from the peripheral edge 2a of the information-bearing disc 2.In this position, the information carrier disc 2 is no longer guided by the lower support surface 36a of the auxiliary guide 36. This allows the information carrier disc 2 to be lowered onto the gripper 40 of the disc platter 41 in a manner not shown by a lowering device (not shown) in a second retraction direction 45 perpendicular to the retraction plane 25. The ejection process is exactly the reverse of the retraction process. Figure 4 shows a first embodiment of the conveyor wheel 16. The conveyor wheel 16 is made of steel and has a circumferential groove 18 therein. The circumferential groove 18 has an inner circumferential surface 50. The groove 18 has an inner groove height 51 at the inner circumferential surface 50. On the upper side 18 there is a pressure side 52 and on the lower side there is a pressure side 53. The pressure side 52 forms an oblique angle 52a with the retraction plane 25, the pressure side 53 forms an oblique angle 53a with the retraction plane 25. The groove 18 of the conveyor wheel 16, with the oblique pressure sides 52 and 53 and the inner circumferential surface 50, is essentially a V-shaped shape with the bottom truncated. Figure 5 shows a cross-section of a second embodiment of the conveyor wheel 16. The conveyor wheel 16 has a steel base element 72. The base profile 55 of the base element 72 can be made of raw steel, for example by turning. The base profile 55 of the base element 72 is coated with a chromium carbide layer 56 in the location of the groove 18. The chromium carbide layer 56 can be applied, for example, by vapor deposition. The vapor deposition can be chemical vapor deposition (CVD). The chromium carbide layer 56 applied from the vapor deposition is parallel to the base profile 55. The circumferential groove 18 has an inclined pressure side 59 on the upper side and an inclined pressure side 60 on the lower side. The inclined pressure side 59 forms an oblique angle 61 with the indentation plane 25, and the inclined pressure side 60 forms an oblique angle 62 with the indentation plane 25. Instead of the vapor-deposited chromium carbide layer 56, a tungsten-carbon-hydrogen layer can be used. Figure 6 is a cross-section of the support segment 12. The support segment 12 has a steel base element 73 which has a base profile 63. This base profile 63 is coated with a chromium carbide layer 64 in the location of the groove 13. The circumferential groove 13 of the support segment 12 has an inner circumferential surface 65 and an inner groove height 66. The chromium carbide layer 64 can be applied, for example, by vapor-phase coating and is parallel to the steel base profile 63. The groove 13 has an inclined pressure side 67 on its upper side and an inclined pressure side 68 on its lower side. The inclined pressure side 67 forms an angle of inclination 69 with the retraction plane 25, and the inclined pressure side 68 forms an angle of inclination 70 with the retraction plane 25. In Figure 7, the 16 conveyor wheels of Figure 5, The interaction between the holding segment 12 and the information carrier plate 2 according to FIG. 6 is shown. The information carrier plate 2 is made of polycarbonate and has a first plate surface 2b, a second plate surface 2c and a peripheral edge 2d. During the drawing-in process, the information carrier plate 2 is held in the groove 18 of the conveying wheel 16 and in the groove 13 of the holding segment 12. The first plate surface 2b of the information carrier plate 2 is in contact with the pressure side 59 of the conveying wheel 16 and HU 220 927 Bl is connected to the pressure side 67 of the support segment 12. The second plate surface 2c of the information carrier plate 2 is connected to the pressure side 60 of the transport wheel 16 and to the pressure side 68 of the support segment 12. Due to the inclination of the pressure sides 59 and 60 of the transport wheel 16 and the pressure sides 67 and 68 of the support segment 12, the plate surfaces 2b and 2c of the information carrier plate 2 and the pressure sides 59, 67, and 60, 68, respectively, are in substantially point-like contact at the location of the peripheral edge 2a of the plate. Generally, no information is stored on the information carrier plate in the area of ​​the peripheral edge 2a. The area of ​​the information carrier plate 2 on which information is stored does not contact either the groove 18 of the lower transport wheel or the groove 13 of the support segment 12. This prevents damage to the areas of the information-carrying disc 2 on which information is stored.During retraction, the outer, peripheral edge 2d of the information carrier disc 2 is not touched by either the inner peripheral surface 57 of the conveying wheel 16 or the inner peripheral surface 65 of the holding segment 12. The inner groove height 58 of the conveying wheel 16 and the inner groove height 66 of the holding segment 12 are selected to be smaller than the thickness 71 of the information carrier disc 2. The inclination angles 61 and 62 of the pressure sides 59 and 60 of the transfer wheel 16 are between 3° and 7°. The inclination angles 69 and 70 of the pressure sides 67 and 68 of the support segment 12 are between 4° and 8°. These small inclination angles allow large normal forces to be exerted on the plate surfaces 2b and 2c of the information carrier disc 2 by the pressure sides 59, 60 and 67, 68, respectively. This creates an effective gripping effect. Chromium carbide has a very high hardness, reaching a Vickers hardness of over 800. The modulus of elasticity of chromium carbide is very high, reaching values ​​of over 300 GPa. Due to the high hardness of the chromium carbide layer 56 of the conveyor wheel 16 and the chromium carbide layer 64 of the support segment 12, the wear of both the chromium carbide layers 56 and 64 and the plate surfaces 2b and 2c of the 2 information-bearing plates is very low. Since chromium carbide has a very good adhesion to the polycarbonate, very high static friction forces are generated between the plate surfaces 2b and 2c of the information-bearing plate and the pressure sides 59, 60 and 67, 68, respectively. The modulus of elasticity of the chromium carbide layers 56 and 64 is much higher than the modulus of elasticity of the 2 information-bearing plates. As a result, the plate surfaces 2b and 2c of the information carrier plate 2 are partially connected to the pressure sides 59, 60 and 67, 68, respectively, and thus a frictional connection is established between the information carrier plate 2 and the chromium carbide layers 56 and 64.The maximum surface roughness R of the printing sides 59, 60 and 67, 68 is between 2 pm and 15 pm and the arithmetic average roughness R is between 0.2 pm and 1.5 pm. The inclined pressure sides 59, 60 and 67, 68 allow the insertion of information-carrying discs 2 of different thicknesses 71. Figure 8 shows the second embodiment of the retractor in the extended position. The second embodiment is identical to the first embodiment except for the structure of the first guide. The first rotatable arm 7 carries a transmission wheel 75 as a first guide, which is fixed so that it can be rotated about the pivot pin 76. A motor 78 is fixed on the bottom plate 6e of the housing 1, the shaft 78a of which carries a worm wheel 79. The motor 78 can be operated in two directions. The worm wheel 79 can be used to drive the gear wheel 80. The gear wheel 80 is rotatably fixed on the pivot pin 80a carried by the bottom plate 6e. The gear wheel 80 is in engagement with the gear wheel 81, which is rotatably fixed on the pivot pin 8 of the first rotatable arm 7. The gear wheel 81 is in engagement with the gear wheel 82, which is rotatably fixed on the pivot pin 82a of the first rotatable arm 7. The gear 82 is engaged with the toothed ring 83 located on the transmission wheel 75. Thus, the transmission wheel 75 can be driven in two directions by the motor 78 via the shaft 78a, the worm wheel 79, the gear 80, the gear 81 and the gear 82. The geometrical dimensions of the groove 77 of the first wire 75 and the groove 18 of the second wire 16 are exactly the same. The first wire 75 and the second wire 16 rotate in opposite directions and at the same speed. As a result, the information carrier disc 2 is drawn into and pushed out of the device without self-rotation. The retraction process from the extended position to the intermediate position and the retracted position is similar to the retraction process of the first embodiment.

Claims

PATENT CLAIMS 1. A pulling device for inserting and extracting an information carrier disc in an information technology device, the device comprising a first conductor and a second conductor, and both conductors have a groove (13, 18) for the peripheral edge (2a) of the disc; the second conductor is rotatably driven as a conveying wheel (16), and is designed to roll the information carrier disc (2) during insertion and extraction, and the groove (13) of the first conductor and the groove (18) of the second conductor have a pressure side (52, 53; 59, 60; 67, 68) inclined relative to the insertion plane (25); characterized in that the first conductor and the second conductor are movably supported; the first conductor groove (13) and the second conductor groove (18) have an inner surface (50, 57, 65) perpendicular to the retraction plane (25); and the respective inner groove height (51, 58, 66) is selected to be smaller than the thickness (71) of the information carrier disc (2).

2. The retracting device according to claim 1, characterized in that the first guide groove (13) and the second guide groove (18) have a pressure side (52, 53; 59, 60; 67, 68) on the upper side and lower side of the groove (13; 18) which is inclined with respect to the retracting plane.

3. The retracting device according to claim 1 or 2, characterized in that the groove (13; 18) of the first conductor and the groove (13; 18) of the second conductor are pressed against the information carrier plate (2) during retraction.

4. A pull-in device according to claim 3, characterized in that the information carrier disc (2) is held in the groove (13; 18) of the first conductor and the second conductor against a pulling force of at least 0.7 N.

5. The retractor according to any one of claims 2-4, characterized in that the inclination angle of the pressure sides (69, 70) of the first conductor is between 4° and 8°, and the inclination angle of the pressure sides (52a, 53a; 61, 62) of the second conductor is between 3° and 7°.

6. A retractor according to any one of claims 1-5, characterized in that the first conductor is formed by a support segment (12).

7. The pulling device according to any one of claims 1-5, characterized in that the first conduit is formed by a rotatably driven conveying wheel (75).

8. The pull-in device according to any one of claims 1-7, characterized in that the elastic modulus of the pressure sides (52, 53; 59, 60; 67, 68) is greater than the elastic modulus of the information carrier plate (2); the surface roughness of the pressure sides (52, 53; 59, 60; 67, 68) and the force pressing the information carrier plate against the pressure sides (52, 53; 59, 60; 67, 68) of the groove are such that there is non-slip adhesion between the surface of the information carrier plate and the pressure sides (52, 53; 59, 60; 67, 68).

9. The feeding device according to any one of claims 1-8, characterized in that the base material of the conveying wheel (16) is steel, and the steel is coated with a chromium carbide layer (56) at least at the pressure sides (59, 60).

10. The pulling-in device according to any one of claims 1-8, characterized in that the base material of the conveying wheel (16) is steel, and the steel is coated with a tungsten-carbon-hydrogen layer at least at the pressure sides (59, 60).

11. The pulling device according to any one of claims 1-10, characterized in that the base material of the first conductor is steel and the steel is coated with a chromium carbide or tungsten hydrocarbon layer (64) at least at the pressure sides (67; 68).

12. The retractor according to any one of claims 1-11, characterized in that the maximum surface roughness R of the pressure sides (52, 53; 59, 60; 67, 68) is between 2 pm and 15 pm, and the arithmetic average roughness Ra is between 0.2 pm and 1.5 pm.

13. A retractor according to any one of claims 9-12, characterized in that the chromium carbide layer or the tungsten hydrocarbon layer (56, 64) is applied by a vapor phase coating process.

14. The retracting device according to any one of claims 1-13, characterized in that it is built into a deck (drive device).

15. The retractor according to claim 14, characterized in that it is integrated into an information technology device.

16. The retracting device according to claim 14, characterized in that it is built into a car radio.