JP4358845B2 - Magnetic tape cartridge - Google Patents

Description

  The present invention relates to a magnetic tape cartridge in which a single reel on which a magnetic tape is wound is rotatably accommodated in a cartridge case, and in particular, a slide for opening and closing a tape drawer opening for pulling out one end of the magnetic tape. The present invention relates to a configuration of a spring member that biases the door toward the closed position.

  Conventionally, in a magnetic tape cartridge used as a recording medium used in an external storage device such as a computer, a single reel on which a magnetic tape is wound has a substantially square planar shape composed of an upper half and a lower half. Some of them are rotatably accommodated in a flat cartridge case. These magnetic tape cartridges are mainly used as a computer memory backup.

  There are, for example, two types of conventional magnetic tape cartridges of this type. One of them is a state in which the magnetic tape is completely wound on a reel when not in use, and the tip of the magnetic tape is a cartridge case. It is comprised so that it may be latched by the leader block accommodated so that the opening part for tape drawers formed in one corner may be covered.

  Another type is a mode in which a lid that can be opened and closed in the direction of the cartridge plane is spring-biased toward a closed position in a tape drawer opening formed on one side wall of the cartridge case, and In order not to rotate when the cartridge is not used, it is attached in such a manner that it is locked in the closed position by a lid lock that is spring-biased in the locked position, and the tip of the magnetic tape is attached to the hook incorporated in the opening for drawing out the tape It is comprised so that a part may be latched.

  When the magnetic tape cartridge having such a configuration is set in the recording / reproducing device of the corresponding external storage device, the rotation driving means on the device side is engaged with the engaging teeth of the reel exposed at the center of the lower half. In the former case, the lid is first opened by the tape pulling mechanism on the apparatus side, and in the latter case, the lid is opened first by the tape pulling mechanism on the apparatus side. Then, when the hook is pulled out together with the magnetic tape, the magnetic tape is pulled into a predetermined position of the tape running path, and data can be written / read on the magnetic tape.

  By the way, among the two types of magnetic tape cartridges described above, those using the former leader block only have to have the advantage that the tape drawing mechanism on the apparatus side can be simplified because it is only necessary to grasp and pull out the leader block when drawing the tape. When the cartridge is not used, there is a drawback that dust easily enters the inside of the cartridge from the gap between the opening for drawing the tape and the leader block.

  On the other hand, the latter open / close lid type has solved the problem that dust can easily enter the cartridge, but when the tape is pulled out, the lid must first be released before the lid is opened. There is a problem in that the tape drawing mechanism on the side becomes complicated and a rotation space for the rotation type lid is required. Further, the cartridge side also has a problem in that it takes time to incorporate a torsion spring for urging the lid and a coil spring for urging the lid lock when assembling the cartridge.

  Accordingly, it has been proposed to provide a slide door for opening and closing the tape drawer opening, and to arrange a spring member for urging the slide door toward the closed position in the moving passage of the slide door. Since the sliding stroke of the door is relatively long, it is difficult to arrange a spring member having a large stroke corresponding to this in a narrow space, and it is difficult to obtain desired spring characteristics.

  In view of the above circumstances, an object of the present invention is to effectively solve the problem relating to the spring characteristics of the spring member in a magnetic tape cartridge provided with a slide door that opens and closes a tape drawer opening.

  In the present invention, a door unit in which a slide door and a spring member for biasing the slide door toward the closed position are incorporated in a separate case is attached to one side of the cartridge case, and the slide door is attached to the spring member. The above-mentioned object is achieved by providing an engaging means for temporarily fixing the predetermined position against the urging force between the sliding door and the case of the door unit.

  In the present invention, by adopting a configuration in which a door unit in which a slide door and a spring member that biases the slide door toward the closed position are incorporated in a separate case is attached to the cartridge case, Assembling becomes easy, and the engagement means for temporarily fixing the sliding door is provided between the sliding door and the case of the door unit, so that the door unit can be easily attached to the cartridge case.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 and 2 are perspective views of a magnetic tape cartridge according to the present invention. FIG. 1 shows a closed state of the slide door, and FIG. 2 shows an open state of the slide door.

  In the magnetic tape cartridge, a single reel wound with a magnetic tape is rotatably accommodated in a cartridge case 1 composed of an upper half 1a and a lower half 1b. On one side wall of the cartridge case 1, a tape drawing opening 2 for drawing out one end of the magnetic tape is formed so as to straddle the upper half 1a and the lower half 1b and close to the corner portion. A slide door 3 for opening and closing the tape drawing opening 2 is provided to be slidable in a direction parallel to the insertion direction of the magnetic tape cartridge with respect to the external device. As will be described later, the slide door 3 is urged toward the closed position by the spring member interposed between the cartridge case 1 and the slide door 3 in the cartridge case 1 and is held in the closed position. It has become.

  A recess 6 as shown in FIG. 2 is formed in the inside of the tape drawing opening 2, and a leader pin 4 that clamps the tip of the magnetic tape is accommodated in the recess 6. This magnetic tape cartridge Is inserted into a corresponding recording / reproducing device such as an external storage device, the rotation driving means on the device side engages with the engaging teeth of a reel (not shown) exposed in the opening of the center portion of the lower half 1b, The apparatus side member contacts the front end surface 3a of the slide door 3, the slide door 3 is opened, and the leader pin 4 is pulled together with the magnetic tape to the apparatus side by the apparatus side tape pulling mechanism, whereby the magnetic tape is moved to the apparatus side. It is possible to write / read data to / from the magnetic tape.

  Further, on one side of the cartridge case 1, a rotary operation knob 5 for preventing erasure and double writing of the magnetic tape is exposed.

  FIGS. 3A and 3B are schematic front views showing a first embodiment of the sliding door urging structure in the magnetic tape cartridge according to the present invention, and FIG. 3A shows the closed state of the sliding door. FIG. 3B shows the open state of the slide door. FIG. 4A is a schematic perspective view of the sliding door as viewed from the back side, and FIG. 4B is a side view of the sliding door as viewed from the rear.

  The moving passage 7 of the slide door 3 inside the cartridge case 1 is provided with a spring member 6 made of a wave-shaped leaf spring for urging the slide door 3 toward the closed position and holding the slide door 3 in the closed position. Yes. As shown in FIG. 4, a concave portion 3c extending from the rear end surface 3b side toward the front end surface 3a side is formed on the rear surface of the slide door 3, and the rear end is disposed in the concave portion 3c. The front half portion of the spring member 6 brought into contact with 1c is accommodated, and the front end of the spring member 6 is in contact with the front end wall surface 3d of the recess 3c.

  With this configuration, as shown in FIG. 3B, the spring member 3 is opened even when the slide door 3 is opened and the distance between the rear end surface 3b of the slide door 3 and the wall surface 1c of the cartridge case 1 is reduced. 6 holds the required urging force with a margin.

  In addition, it replaces with the recessed part 3c formed in the back surface of the slide door 3, and the rear end surface of the slide door 3 as shown to Fig.5 (a), (b) corresponding to Fig.4 (a), (b) is shown. A blind hole-shaped recess 3e extending from the 3b side toward the front end face 3a may be formed, and the front half of the spring member 6 may be accommodated in the recess 3e.

  FIG. 6 is a schematic perspective view showing a second embodiment of the sliding door urging structure in the magnetic tape cartridge according to the present invention. In the present embodiment, a notch 3f is formed in a part of the upper portion of the slide door 3, and a front half portion of a spring member 8 made of a coil spring is mounted in the notch 3f. The front end of the spring member 8 is in contact with the front end wall surface 3g of the notch 3f, and the rear end is in contact with a locking wall 9 formed in the upper half 1a. Reference numeral 10 denotes a temporary fixing rib of the spring member 8.

  It is clear that this embodiment also has the same effect as that of the first embodiment described above.

  FIGS. 7A and 7B are schematic front views showing a third embodiment of the sliding door urging structure in the magnetic tape cartridge according to the present invention, and FIG. 7A shows the closed state of the sliding door. FIG. 7B shows the open state of the slide door.

  In the present embodiment, as in the first embodiment shown in FIGS. 3A and 3B, a recess 3c is formed on the back surface of the slide door 3, and a part of the spring member is accommodated in the recess 3c. However, in this case, the spring member is composed of two spring members 6A and 6B arranged in series via the slide plate 11, and one spring member 6A is more than the other spring member 6B. Also has a strong spring force.

  According to the present embodiment, when the slide door 3 is opened against the biasing force of the spring members 6A and 6B, the weak spring member 6B is compressed first, and then the strong spring member 6A is compressed, so that the slide door is compressed. A relatively constant spring characteristic can be obtained over the entire three slide strokes, and the door opening / closing force can be easily adjusted.

  FIGS. 8A and 8B are schematic front views showing a fourth embodiment of the sliding door urging structure in the magnetic tape cartridge according to the present invention, and FIG. 8A shows the closed state of the sliding door. FIG. 8B shows the open state of the slide door.

  Although this embodiment also includes two spring members 6A and 6B, these two spring members 6A and 6B are arranged in parallel in the moving passage 7 of the slide door 3, and one spring member 6A is provided. The spring is longer than the other spring member 6B.

  In the present embodiment, when there is an obstacle such as a recess 12 in one half, for example, the upper half 1a, and it is impossible to arrange a long spring member, the upper half 1a has a short width. The spring member 6A is arranged with a long and narrow spring member 6B in the lower half 1b so as to obtain a desired urging force as a whole.

  FIGS. 9A and 9B are schematic front views showing a fifth embodiment of the sliding door urging structure in the magnetic tape cartridge according to the present invention. FIG. FIG. 9B shows the open state of the slide door.

  In this embodiment, instead of a metal spring member, a plurality of ring-shaped elastic members 13 such as rubber rings (three in FIG. 9) are arranged in series in the moving passage 7 of the slide door 3. is there.

  Since the ring-shaped elastic member 13 such as a rubber ring is easy to manufacture and does not lose its urging force until it is compressed into a substantially flat state as shown in FIG. Thus, a spring member having a long stroke and a required urging force can be obtained.

  10 (a) and 10 (b) are schematic front views showing a sixth embodiment of the sliding door urging structure in the magnetic tape cartridge according to the present invention, and FIG. 10 (a) shows the closed state of the sliding door. FIG. 10B shows the open state of the slide door.

  In the present embodiment, instead of the ring-shaped elastic member 13 such as the rubber ring of FIG. 9, a required plurality (three in FIG. 10) of the spiral-shaped, that is, coil ring-shaped elastic members 14 are moved. These are arranged in series in the passage 7. It is obvious that the present embodiment can provide the same effects as those of the fifth embodiment described above.

  FIGS. 11A to 11D are schematic front views showing a seventh embodiment of the sliding door urging structure in the magnetic tape cartridge according to the present invention, and FIG. 11A shows the closed state of the sliding door. 11 (b) to 11 (d) respectively show states where the slide door is opened from the closed position.

  In this embodiment, instead of the spring member made of a leaf spring bent in a wave shape in the first embodiment, a spring member 16 made of a wave wire spring having two coil portions 16a and 16b is used as a slide door. 3 is provided in the three movement paths 7. In addition, in the front view after FIG. 11, the state which open | released the movement path | route 7 is shown for convenience.

  With such a configuration, when the slide door 3 is opened, the spring member 16 contracts as shown in FIG. 11 (b), and the bent portion of the spring member 16 as shown in FIGS. 11 (c) and 11 (d). A part rides on another bending part and cross | intersects by using coil part 16a, 16b as a fulcrum. Therefore, the stroke length of the spring member 16 can be increased.

  In the seventh embodiment, the spring member 16 is provided with two coil portions 16a and 16b. However, the present invention is not limited to this, and only one portion or three or more coil portions are provided. You may make it provide. Thus, the spring member 16 having desired spring characteristics can be obtained by changing the number of coil portions. The spring member 16 having desired spring characteristics can also be obtained by changing the number of turns of the wire spring in the coil portion.

  12 to 15 are views showing an eighth embodiment of the sliding door urging structure in the magnetic tape cartridge according to the present invention. FIG. 12 (a) shows the closed state of the sliding door, and FIG. It is a schematic front view which shows the open state of a slide door, respectively. 13 is a perspective view of a slide door to which a spring member regulating plate is attached, FIG. 14 is an enlarged sectional view taken along line XIV-XIV in FIG. 12A, and FIG. 15 is XV- in FIG. It is sectional drawing along the XV line.

  As described above, since the slide door 3 has a relatively long slide stroke, if a coil spring is used as a spring member for biasing the slide door 3 toward the closed position, the coil spring may be buckled when the slide door 3 is opened. is there. Therefore, in this embodiment, the spring member regulating plate 18 is attached to the rear end of the slide door 3 (the leading end when the slide door 3 is opened) to prevent buckling of the spring member 20 made of a coil spring. ing.

  That is, in the present embodiment, as shown in FIG. 13, the upper and lower edges substantially parallel to the sliding direction of the sliding door 3 at the rear end of the sliding door 3 (the leading end when the sliding door 3 opens). A rectangular spring member regulating plate 18 having 18a, 18a extending into the moving passage 7 of the slide door 3 is attached. An extension 19 for receiving the spring member regulating plate 18 is connected to the moving passage 7 on the side opposite to the slide door 3 side.

  The spring member regulating plate 18 has a height dimension shorter than the height dimension of the slide door 3 and, as is apparent from FIG. 14, is a spring member comprising a coil spring that urges the slide door 3 toward the closed position. 20 and 20 are accommodated in a space surrounded by the upper and lower edges 18 a and 18 a of the spring member regulating plate 18 and the peripheral wall of the moving passage 7.

  Therefore, even if the spring member 20 is compressed during the opening operation of the slide door 3, each spring member 20 is regulated by the wall surface of the moving passage 7 and the edge portion 18 a of the spring member regulating plate 18, so that there is no risk of buckling. The axis can always be kept in the moving direction of the slide door 3.

  In general, the extending direction of the moving passage 7 of the sliding door 3 is provided with a positioning notch 17 or the like as shown in FIG. Sometimes it cannot be provided on the line. In this case, as shown in FIG. 15, the extension 19 is curved with respect to the moving passage 7 while avoiding the notch 17, and the spring member regulating plate 18 is formed of a flexible material, and the spring What is necessary is just to make it the member control board 18 slide along the extended part 19 which curved.

  FIGS. 16 (a), 16 (b) and 17 are views showing a ninth embodiment of the urging structure of the slide door in the magnetic tape cartridge according to the present invention. FIG. 16 (a) shows the closing of the slide door. FIG. 16B is a schematic front view showing the open state of the slide door, and FIG. 17 is an enlarged cross-sectional view taken along line XVII-XVII in FIG.

  This embodiment is also a configuration for preventing buckling of the spring member 20 made of a coil spring, and is provided on both side walls of the moving passage 7 of the sliding door 3 with the concave grooves 21 and 21 extending in the moving direction of the sliding door 3. 17 are formed facing each other, and a space for accommodating a spring member having a width b larger than the interval a between the side wall surfaces of the moving passage 7 is defined, and a coil spring is formed in this space. The spring member 20 is accommodated.

  This configuration can not only prevent buckling of the spring member 20 made of a coil spring, but also can use a coil spring having a diameter larger than the interval a as the spring member 20. The degree of freedom increases. Further, for example, as shown in FIG. 18, a notch 17 'for positioning and handling exists behind the moving path 7, and the spring stroke of the bending spring 16 having a waveform as shown in FIG. 11 is limited. Even in such a case, a spring accommodating space can be secured over the entire inner dimension of the cartridge case 1.

  The concave grooves 21 and 21 may be provided at the joint portions of the upper and lower halves 1a and 1b. However, as shown in FIG. 17, the positions where the concave grooves 21 and 21 are provided are slightly above the upper half 1a or the lower half 1b. Since the spring member 20 can be assembled to the upper half 1a or the lower half 1b when the cartridge case 1 is assembled, the assemblability is improved.

  FIGS. 19 to 21 are views showing a tenth embodiment of the urging structure of the sliding door in the magnetic tape cartridge according to the present invention. FIG. 19A shows the closed state of the sliding door, and FIG. ) Is a schematic front view showing the open state of the sliding door. 20 is an enlarged cross-sectional view taken along line XX-XX in FIG. 19A, and FIGS. 21A, 21B, and 21C are lines AA and BB in FIG. 20, respectively. , CC sectional view.

  This embodiment is also a configuration for preventing buckling of the spring member 20 made of a coil spring, and extends backward at the rear end of the slide door 3 (the end on the leading side when the slide door 3 opens). The member support shaft 22 is attached, and the spring member 20 made of a coil spring is fitted into the spring member support shaft 22 so that the spring member 20 is stabilized.

  Also in the case of this embodiment, in order to be able to use a large-diameter coil spring as shown in FIG. 21 (c), the movement path 7 is similar to the embodiment shown in FIGS. It is desirable to provide a spring accommodating space having a width larger than the interval between the both side wall surfaces. Further, the cartridge case 1 is provided with a wall 23 having a shaft hole 23a through which the spring member support shaft 22 is inserted as a spring seat on the rear side of the moving passage 7 of the slide door 3, as shown in FIG. By providing a flat portion on the side surface of the spring member support shaft 22 and making the shape of the shaft hole 23a through which the spring member support shaft 22 is inserted into a shape corresponding to the cross-sectional shape of the spring member support shaft 22, the spring member 20 is a spring. Since it is possible to prevent the gap between the member support shaft 22 and the shaft hole 23a from entering, and the area of the spring seat increases, the end of the spring member 20 can be stably received by the wall 23.

  By providing such a spring member support shaft 22 on the slide door 3, as shown in FIG. 22A, the spring member 20 made of a coil spring can be easily incorporated into the lower half 1b, for example. When there is no shaft 22, as shown in FIG.22 (b), the spring member 20 buckles and it becomes difficult to incorporate.

  Also in this case, as shown in FIGS. 23 and 24, a recess 3c is formed in the rear end portion of the slide door 3, and the spring member support shaft 22 is projected from the rear end wall portion 3d of the recess 3c so that the wall By using the portion 3d as one receiving seat for the spring member 20 and retracting the coiled spring member 20 between the wall surface 1c of the cartridge case 1, the stroke of the spring member 20 can be increased, and the spring member The selection range of 20 can be expanded.

  Further, as shown in FIG. 25, by providing a protrusion 22a for temporarily fixing the terminal end of the spring member 20 at the tip of the spring member support shaft 22, the spring member 20 is assembled to the spring member support shaft 22 in advance. Incorporation suitability is further improved. In this case, by making the tip of the spring member support shaft 22 smaller than the outer diameter of the spring member support shaft 22, the spring member 20 can be easily inserted into the spring member support shaft 22 by automatic assembly.

  Moreover, it is preferable that the spring member temporary fixing convex portion provided at the distal end portion of the spring member support shaft 22 has a tip crack structure including a pair of elastic pieces 22b and 22b as shown in FIG. In that case, even when the distal end portion of the spring member support shaft 22 is inserted into the shaft hole 23a of the wall 23, even if the opening diameter of the shaft hole 23a is reduced, as shown in FIG. 22b approaches each other, and the tip of the spring member support shaft 22 can be easily inserted into the shaft hole 23a. With this insertion, the end of the spring member 20 is received by the wall 23 constituting the spring seat.

  Needless to say, the opening diameter of the shaft hole 23a may be such a size that the elastic pieces 22b and 22b are not deformed, as shown in FIG. Even in this case, as shown in FIGS. 20 and 21, flat portions are formed on both side surfaces of the spring member support shaft 22 including the elastic pieces 22b and 22b, and the shape of the shaft hole 23a is changed to the spring member support shaft. By making the shape corresponding to the cross-sectional shape of 22, the end of the spring member 20 can be stably received by the wall 23.

  Furthermore, if the closely spaced portions 20a as shown in FIG. 27 are provided at a plurality of locations of the spring member 20 made of a coil spring, the rigidity of the spring member 20 increases and buckling can be prevented.

  In addition, the spring member support shaft 22 is desirably formed integrally with the slide door 3, thereby preventing an increase in the number of parts, but as shown in FIGS. 28 (a) to 28 (c), You may form with components different from the slide door 3. FIG. 28A is a plan view of the main part of the spring member support shaft, FIG. 28B is a side view of the spring member support shaft, and FIG. 28C is a cross-sectional view of the main part showing the concave portion of the slide door. . The spring member support shaft 22 includes a shaft main body 22c having a distal end configuration as shown in FIG. 26, a small diameter portion 22d formed at the root of the shaft main body 22c, and a proximal end portion connected to the small diameter portion 22d. The base end portion 22e is flat on both sides in order to prevent rotation. The spring member support shaft 22 having such a configuration has a shape corresponding to the root portion of the spring member support shaft 22 as shown in FIG. 28C after the spring member 20 is mounted from the base side. The slide door 3 is inserted into the concave portion 24 from above and fixed to the slide door 3 as shown in FIG.

  30 to 32 are views showing an eleventh embodiment of the urging structure of the slide door in the magnetic tape cartridge according to the present invention. FIG. 30 is a perspective view showing a state in which the door unit is assembled to the cartridge case. (A) is a sectional front view showing a state where the sliding door is temporarily fixed in the door unit, FIG. 31 (b) is a sectional front view showing a state where the sliding door is slidable, and FIG. 32 is FIG. 31 (b). It is an expanded sectional view along line AA.

  In the present embodiment, the side walls of the upper and lower halves 1a and 1b of the cartridge case 1 where the slide door 3 is to be provided are removed, and instead, the slide door 3 and the slide door 3 are urged toward the closed position. A separate door unit 30 in which a spring member 20 composed of a plurality of coil springs is incorporated in the case 25 in advance is configured to be attached to the cartridge case 1 by adhesion or fitting. The case 25 is formed with an opening 25a corresponding to the tape drawer opening 2 of FIG.

  Further, in the door unit 30 of the present embodiment, the plurality of spring members 20 are assembled in the case 25 prior to attachment to the cartridge case 1, and then the sliding door 3 is moved by the urging force of the spring member 20 to the case 25. Temporary fixing mechanism is provided for temporarily fixing so as not to jump out.

  As shown in FIG. 31, the temporary fixing mechanism slides to engage with the engaging protrusions 25 b respectively protruding from the top wall surface and the bottom wall surface of the moving passage of the slide door 3 and the engaging protrusions 25 b. The upper and lower edges of the door 3 are respectively provided with engaging recesses 3f. The spring member 20 is assembled in the sliding door moving passage of the case 25, and then the sliding door 3 is opened to the right in the figure. Then, the slide door 3 is temporarily fixed by being inserted into the slide door movement passage and engaging the respective engagement recesses 3f with the respective engagement projections 25b as shown in FIG. 31 (a). Then, after assembling the door unit 30 to the cartridge case 1 in this state, as shown in FIG. 31 (b), the slide door 3 is pushed leftward to disengage the engagement recess 3f and the engagement protrusion 25b. As a result, the slide door 3 can slide.

  Further, in the present embodiment, in order to ensure a stable operation of the spring member 20, a plurality of ribs 25c extending in the sliding direction of the sliding door 3 as shown in FIG. 32 are opposed to both side surfaces of the sliding door moving passage. And it is protruding.

  According to the present embodiment, the separate door unit 30 in which the slide door 3 and the spring member 20 are preliminarily incorporated in the case 25 is configured to be retrofitted to the cartridge case 1. The door unit 30 can be easily mounted and the door unit 30 can be easily assembled to the cartridge case 1.

  By the way, as a spring member that urges the slide door 3 toward the closed position, for example, when a wire spring bent in a wave shape as shown in FIG. 33A is used, the end of the spring member that contacts the end surface of the slide door 3 is used. May enter the gap between the slide door 3 and the cartridge case 1. Therefore, in the twelfth embodiment of the sliding door urging structure in the magnetic tape cartridge according to the present invention, the end portion 26a of the spring member 26 is arranged along the end face of the sliding door 3 as shown in FIG. By forming the bent portion 27, the above-mentioned fear can be eliminated.

  Further, in the thirteenth embodiment of the sliding door biasing structure in the magnetic tape cartridge according to the present invention, when a coil spring is used as a spring member for biasing the sliding door 3 toward the closed position, FIG. , (B), a spring member 28 having a rectangular, oval or elliptical annular portion corresponding to the slit-like cross-sectional shape of the slide door 3 is used. Thereby, buckling of a spring member can be prevented and the incorporating property of a spring member can be improved.

  FIGS. 35 and 36 are views showing a fourteenth embodiment of the sliding door urging structure in the magnetic tape cartridge according to the present invention. FIGS. 35 (a) and 35 (b) are front views showing the sliding door and the spring member. 36 and 36 are exploded perspective views of the spring member.

  In the present embodiment, the spring member that urges the slide door 3 toward the closed position is coupled to the coil spring 32 and one end (FIG. 35A) or both ends (FIG. 35B) of the coil spring 32. And a plate spring 31. That is, the leaf spring 31 includes a central plate portion 31a provided around the convex portion 31b into which the terminal end of the coil spring 32 is fitted, and a wing portion 31c that is bent from both ends of the central plate portion 31a and extends toward the slide door 3. , 31c, and the tips of the wings 31c, 31c are respectively engaged with engaging projections 3g, 3g projecting from the upper and lower ends of the end surface of the slide door 3.

  According to the present embodiment, since the coil spring 32 can be shortened by the amount of the leaf spring 31 provided, the coil spring 32 is less likely to buckle, and the spring is selected and combined with the coil spring 32 and the leaf spring 31. The degree of freedom in design can be increased.

  That is, in the case of only the coil spring, as shown in FIG. 37 (a), the relationship between the spring displacement and the urging force is a straight line, but in the case of the present embodiment, FIG. 37 (b) or FIG. As shown in (c), since the relationship between the spring displacement and the urging force becomes a broken line, the degree of freedom in spring design can be increased.

The perspective view which shows the magnetic tape cartridge by this invention in the closed state of a slide door. The perspective view which shows the magnetic tape cartridge of FIG. 1 in the open state of a slide door 1 is a schematic front view showing a first embodiment of a sliding door biasing structure in a magnetic tape cartridge according to the present invention. The schematic perspective view and side view which looked at the sliding door of FIG. 3 from the back side Schematic perspective view and side view corresponding to FIG. 4 showing the deformation of the sliding door Schematic perspective view showing a second embodiment of the sliding door urging structure in the magnetic tape cartridge according to the present invention. Schematic front view showing a third embodiment of a sliding door biasing structure in a magnetic tape cartridge according to the present invention. Schematic front view showing a fourth embodiment of a sliding door biasing structure in a magnetic tape cartridge according to the present invention. Schematic front view showing a fifth embodiment of a sliding door urging structure in a magnetic tape cartridge according to the present invention. Schematic front view showing a sixth embodiment of a sliding door urging structure in a magnetic tape cartridge according to the present invention. Schematic front view showing a seventh embodiment of the sliding door urging structure in the magnetic tape cartridge according to the present invention. Schematic front view showing an eighth embodiment of a sliding door urging structure in a magnetic tape cartridge according to the present invention. The perspective view which shows the slide door which attached the spring member regulation board Enlarged longitudinal sectional view along line XIV-XIV in Fig. 12 (a) Cross-sectional view along line XV-XV in FIG. Schematic front view showing a ninth embodiment of a sliding door urging structure in a magnetic tape cartridge according to the present invention. Enlarged longitudinal sectional view along line XVII-XVII in FIG. The figure which uses for description of the effect of the 9th Embodiment of this invention Schematic front view showing a tenth embodiment of a sliding door urging structure in a magnetic tape cartridge according to the present invention. Enlarged sectional view taken along line XX-XX in FIG. Sectional views along the lines AA, BB, and CC in FIG. The figure for demonstrating the effect of the 10th Embodiment of this invention 19 is a cross-sectional view when the spring member support shaft of FIG. Front view of the sliding door in FIG. The front view which shows a deformation | transformation of the spring member support shaft of FIG. The front view which shows the deformation | transformation of the spring member support shaft of FIG. The front view which shows a deformation | transformation of the coil spring of FIG. 26 is a plan view, a side view, and a cross-sectional view of the main part of the slide door of the spring member support shaft when the spring member support shaft of FIG. FIG. 28 is a cross-sectional view of the main part showing a state where the spring member support shaft of FIG. 28 is fixed to the slide door. The perspective view which shows 11th Embodiment of the urging | biasing structure of the sliding door in the magnetic tape cartridge by this invention Longitudinal sectional view of the main part of the door unit Enlarged sectional view along line AA in FIG. The front view and sectional drawing which show the spring member of 12th Embodiment of the urging | biasing structure of the sliding door in the magnetic tape cartridge by this invention The front view and perspective view which show the spring member of 13th Embodiment of the urging | biasing structure of the sliding door in the magnetic tape cartridge by this invention Front view showing a spring member of a fourteenth embodiment of a sliding door biasing structure in a magnetic tape cartridge according to the present invention. An exploded perspective view of the spring member The figure for demonstrating the effect of 14th Embodiment of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cartridge case 1a Upper half 1b Lower half 2 Tape drawer opening 3 Slide door 4 Leader pin 6, 6A, 6B, 8, 16, 20, 26, 28 Spring member 7 Moving path of slide door 11 Slide plate 13 Ring shape Elastic member 14 Coil ring-shaped elastic member 18 Spring member regulating plate 19 Extension part of moving path of slide door 21 Groove 22 Spring member support shaft 25 Door unit case 30 Door unit 31 Plate spring 32 Coil spring

Claims (1)

A single reel wound with a magnetic tape is rotatably accommodated in a cartridge case, and the cartridge case is provided with a slide door that opens and closes a tape drawer opening for pulling out one end of the magnetic tape. In magnetic tape cartridges,
A door unit in which the slide door and a spring member that biases the slide door toward the closed position are incorporated in a separate case is attached to one side of the cartridge case, and the slide door is attached to the spring member. The magnetic tape cartridge is characterized in that an engaging means for temporarily fixing at a predetermined position against the urging force is provided between the sliding door and the case of the door unit.

Images