JP2007317336A - Reel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reel capable of securing the planarity of a reel plate after insert molding. <P>SOLUTION: An annular rib 55 having a height equal to the thick part of a reel plate 54 is formed in the inner edge of a through-hole 54A formed in the center of the reel plate 54. When the reel plate 54 is subjected to insert molding, injection pressure of a resin during forming and contraction stress of the read after insert molding causes deformation of the reel plate 54 itself. However, by forming the annular rib 55 in the inner edge of the through-hole 54A of the reel plate 54, the strength of the reel plate 54 itself is improved by the rib. Thus, planarity of the reel plate 54 is obtained, and engagement between a reel gear 42 around the reel plate 54 and the drive gear of the rotary shaft of a driving device is improved. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a reel around which a recording tape such as a magnetic tape is wound.

  As an external recording medium such as a computer, for example, a recording tape cartridge in which a reel on which a magnetic tape is wound is accommodated in a case is known. The reel includes a hub that forms an axial center of the reel and on which the magnetic tape is wound around the outer periphery, and an upper flange and a lower flange that project radially outward from both ends in the axial direction of the hub.

  Conventionally, a recording tape in which a recording tape such as a magnetic tape used as a data recording / reproducing medium of a computer or the like is wound around a single reel and the reel is rotatably accommodated in a case made of a synthetic resin. Cartridges are known. The leading end (free end) of the recording tape is provided with a leader member such as a leader pin, a leader tape, or a leader block. The leader member provided on the drive device side pulls out the leader tape from the opening of the recording tape cartridge. The recording tape fixed thereto is wound around a take-up reel on the drive device side.

  Further, an annular reel plate that can be magnetically attached to the rotary shaft on the drive device side is provided on the surface of the hub, and the reel is driven by the driving force from the rotary shaft in a state where the rotary shaft is magnetically attached to the reel plate. Rotates. For this reason, the reel plate is required to have high precision flatness.

However, since this reel plate is integrated with the hub by insert molding, the shape of the reel plate itself is deformed due to the injection pressure of the resin during molding and the shrinkage stress of the resin after molding. Flatness cannot be ensured. For this reason, the meshing accuracy of the gear on the drive device side and the gear on the reel side is deteriorated.
JP 2005-259245 A

In consideration of the above facts, an object of the present invention is to obtain a reel capable of ensuring the flatness of a reel plate after insert molding.

  In order to achieve the above object, according to the first aspect of the present invention, the reel is provided on the bottom surface of the bottomed cylindrical hub around which the recording tape is wound, and can be magnetically attached to the rotary shaft on the drive device side. A through hole is formed at the center of the insert-molded reel plate, and an annular standing wall is formed at the inner edge of the through hole.

  In the first aspect of the present invention, a reel plate that can be magnetically attached to the rotary shaft on the drive device side is insert-molded on the bottom surface of the bottomed cylindrical hub around which the recording tape is wound. A through hole is formed in the central portion of the reel plate, and an annular standing wall is formed at the inner edge of the through hole.

  When the reel plate is insert-molded, the reel plate itself may be deformed by the injection pressure of the resin during molding and the shrinkage stress of the resin after insert molding, but it is formed at the center of the reel plate as in the present invention By forming an annular standing wall at the inner edge of the formed through hole, the strength of the reel plate itself is improved by the standing wall. Thereby, the planarity of the reel plate can be obtained, and the meshing between the gear around the reel plate and the gear on the rotating shaft side is also good.

  Further, by providing such a standing wall, when the resin contracts after molding, the resin bites into the standing wall and the reel plate can be firmly fixed to the bottom surface of the hub. For this reason, it is not necessary to separately form a retaining hole for insert molding in the reel plate, so that the processing steps of the reel plate can be reduced and the cost can be reduced.

  According to a second aspect of the present invention, in the reel according to the first aspect, the height of the standing wall is in the range of about 1/2 to 2 times the thickness of the reel plate.

  Since the present invention has the above configuration, the planarity of the reel plate can be ensured.

  A drive device according to an embodiment of the present invention will be described below with reference to the drawings. First, a recording tape cartridge (magnetic tape cartridge) 10 that can be loaded into the drive device will be described. For convenience of explanation, the direction in which the recording tape cartridge 10 is loaded into the drive device is indicated by an arrow A, which is the front direction (front side) of the recording tape cartridge 10.

  As shown in FIGS. 1 to 3, the recording tape cartridge 10 includes a case 12. The case 12 is configured by joining an upper case 14 and a lower case 16. Specifically, the upper case 14 is configured such that a substantially frame-shaped peripheral wall 14B is erected along the outer edge of the substantially rectangular top plate 14A in plan view, and the lower case 16 is substantially disposed on the top plate 14A. A peripheral wall 16B is erected along the outer edge of the bottom plate 16A having a corresponding shape. The case 12 has a substantially box-like shape in which the upper case 14 and the lower case 16 are joined by ultrasonic welding, screwing, or the like in a state where the opening end of the peripheral wall 14B and the opening end of the peripheral wall 16B are abutted. Is formed.

  In this case 12, the top plate 14A, the peripheral wall 14B, the bottom plate 16A, and the peripheral wall 16B are cut out at the corner on the leading side in the loading direction to the drive device, and an opening 18 inclined with respect to the loading direction is formed. Is formed. Further, a circular gear opening 20 penetrating the bottom plate 16A is provided at a substantially central portion of the bottom plate 16A, and is used for exposing a reel gear 42 described later. At the edge of the gear opening 20 in the bottom plate 16A, an annular rib 22 protrudes inward of the case 12, and is used for positioning a reel 28 and dust proof described later.

  A pair of positioning holes 24 and 26 are opened near the front end of the outer surface of the bottom plate 16 </ b> A of the case 12. The pair of positioning holes 24 and 26 are provided in a bag shape in a protrusion (not shown) standing inward of the case 12 from the bottom plate 16A, and are spaced apart from each other on an imaginary line orthogonal to the loading direction. ing. The positioning hole 24 on the side close to the opening 18 has a substantially square shape in a bottom view circumscribing the positioning pin of the drive device, and the positioning hole 26 is long along the imaginary line and has a width that is the diameter of the positioning pin. It is a long hole corresponding to. Therefore, when the recording tape cartridge 10 is loaded in the drive device and the positioning pins are inserted into the positioning holes 24 and 26, respectively, the recording tape cartridge 10 is accurately positioned in the horizontal direction (left and right and front and rear) in the drive device.

  Further, the positioning holes 24 and 26 around the bottom plate 16A are positioning surfaces 24A and 26A that are finished more smoothly than other portions (design surfaces). The positioning surfaces 24A and 26A come into contact with the positioning surfaces of the drive device provided around the positioning pins when the positioning pins are inserted into the positioning holes 24 and 26, respectively. As a result, the recording tape cartridge 10 is positioned in the vertical direction in the drive device.

  In the case 12 described above, as shown in FIG. 2, only one reel 28 described later is rotatably accommodated. A magnetic tape T as a recording tape is wound around the reel 28, and a leader block 30 as a drawing member is attached to the tip of the magnetic tape T. The leader block 30 is accommodated and held inside the opening 18 of the case 12 when the recording tape cartridge 10 is not used. In this state, the leader block 30 closes the opening 18 and prevents entry of dust or the like into the case 12.

  The leader block 30 has an engaging recess 30A formed at the tip thereof, and when the magnetic tape T is pulled out in the drive device, the leader block 30 is pulled out from the case 12 by a pulling means that engages with the engaging recess 30A. Thus, it is guided to a take-up reel (not shown) of the drive device. Further, the end surface of the leader block 30 opposite to the engagement recess 30A is an arcuate surface 30B, which is inserted into the take-up reel and constitutes a part of the take-up surface on which the magnetic tape T is taken up. It is like that.

  Next, the reel 28 will be described.

  As shown in FIGS. 4 and 5, the reel 28 includes a reel hub 32 that constitutes an axial center portion thereof. The reel hub 32 is formed in a substantially bottomed cylindrical shape having a cylindrical portion 34 around which the magnetic tape T is wound and a bottom portion 36 that closes a lower portion of the cylindrical portion 34. A lower flange 38 is coaxially and integrally extended outward in the radial direction near the bottom 36 side end (lower end) of the reel hub 32.

  On the other hand, an annular upper flange 40 having the same diameter as the outer diameter of the lower flange 38 is coaxially fixed to the reel hub 32 at the upper end portion of the cylindrical portion 34 by ultrasonic welding. That is, in the reel 28, the magnetic tape T is wound around the outer peripheral surface of the cylindrical portion 34 of the reel hub 32 between the opposing surfaces of the lower flange 38 and the upper flange 40.

  An annular reel gear 42 formed coaxially with the reel 28 is provided near the outer periphery of the lower surface (outer surface) of the bottom 36 of the reel hub 32. The reel gear 42 can mesh with a drive gear 108 provided at the tip of the rotary shaft 100 of the drive device.

  On the other hand, as shown in FIGS. 4 and 5, an annular engagement gear 44 formed coaxially with the reel 28 is provided near the outer periphery of the upper surface (inner surface) of the bottom portion 36 of the reel hub 32. The engagement gear 44 is formed on an annular pedestal 46 slightly raised from the inner surface of the bottom 36, and can engage with a brake gear 66 of a brake member 60 described later.

  Further, on the radially outer side of the engagement gear 44 (the pedestal portion 46), standing ribs 48 that are continuous with the inner surface of the cylindrical portion 34 and the upper surface of the bottom portion 36 along the axial direction of the reel 28, respectively, in the circumferential direction and the like. A plurality are provided at intervals. Due to the presence of the standing rib 48, the engagement gear 44 is located on the radially inner side with respect to the reel gear 42.

  Further, a through hole 50 is provided in the axial center portion of the bottom portion 36 of the reel hub 32. A clutch boss 52 is erected from the upper surface of the bottom 36 along the edge of the through hole 50. The clutch boss 52 will be described together with a clutch member 84 described later.

  The portions excluding the upper flange 40 of the reel 28 described above are integrally formed of resin. An annular reel plate 54 made of a magnetic material is provided coaxially and integrally with the reel hub 32 inside the reel gear 42 on the lower surface (front surface) of the bottom portion 36 of the reel hub 32.

  Here, the reel plate 54 uses SPCC as a material, and as shown in FIG. 7, a through hole (through hole) 54 </ b> A is formed at the center of the reel plate 54. An annular rib (standing wall) 55 having a height corresponding to the thickness of the reel plate 54 is formed at the inner edge of the through hole 54A. The reel plate 54 is inserted and molded into a mold (not shown) for molding the reel 28 and integrated with the reel hub 32 (see FIG. 8).

  The reel 28 formed in this manner is accommodated in the case 12 and is placed on the annular rib 22 when not in use. Specifically, the reel 28 is configured such that the outer portion of the taper portion 43 in the bottom portion 36 (in the vicinity of the inner edge of the lower flange 38) abuts on the upper end surface of the annular rib 22. By making the tapered surface 22A corresponding to the tapered portion 43, movement in the radial direction is restricted. And it is the structure which suppresses the penetration | invasion of dust etc. from there.

  In this state, the reel 28 is located in the case 12 as a whole, and the reel gear 42 and the reel plate 54 are exposed from the gear opening 20 (see FIG. 1B). That is, the reel gear 42 faces the outside of the case 12 from the gear opening 20 without protruding from the outer surface (lower surface) of the bottom plate 16A. Further, the through hole 50 faces the gear opening 20 through the through hole 54 </ b> A of the reel plate 54.

  As a result, the reel 28 can be operated from the outside of the case 12, that is, chucking (holding) and rotationally driven. Further, in this state, an annular regulating rib 56 erected from the top plate 14 </ b> A enters the upper portion of the cylindrical portion 34 of the reel 28. The restricting rib 56 has an outer peripheral surface close to the inner edge of the upper flange 40, and restricts movement of the reel 28 in the horizontal direction in the case 12.

  The recording tape cartridge 10 also includes a brake member 60 for preventing the reel 28 from rotating when not in use. The brake member 60 has a base portion 62. The base portion 62 has a cylindrical portion 62A formed in a short cylindrical shape and a disc portion 62B that closes the upper end of the cylindrical portion 62A. It is formed in a bottomed cylindrical shape. The outer diameter of the cylindrical portion 62A is smaller than the inner diameter of the engagement gear 44 (the pedestal portion 46), and the inner diameter is larger than the outer diameter of the clutch boss portion 52.

  An annular ring portion 64 extends radially outward from the axially intermediate portion of the outer peripheral portion of the base portion 62 (cylindrical portion 62A) over the entire circumference. A braking gear 66 is provided on the lower surface of the ring portion 64 over the entire circumference. That is, the braking gear 66 is formed in an annular shape as a whole. The brake gear 66 is configured to be able to mesh with the engagement gear 44 of the reel 28.

  The teeth constituting the brake gear 66 are connected at their inner ends by the cylindrical portion 62A, and the outer end portions in the free state are located slightly inward in the radial direction from the outer edge of the ring portion 64. ing. In other words, the ring portion 64 projects outward in the radial direction from the braking gear 66. More specifically, the outer diameter of the ring portion 64 is slightly larger than the outer diameter of the engagement gear 44, and the outer diameter of the brake gear 66 is slightly smaller than the outer diameter of the engagement gear 44. Further, an annular reinforcing rib 68 is provided on the upper surface of the ring portion 64 along the outer edge portion thereof, and the rigidity of the ring portion 64 (braking gear 66) is ensured.

  Further, a slidable contact projection 70 projects from the shaft core portion on the lower surface (inside the cylinder portion 62A) of the disc portion 62B of the base portion 62. The sliding contact projection 70 has a substantially spherical tip, and is substantially point-contacted with a clutch member 84 described later. The tip of the sliding contact projection 70 is located slightly above the lower end surface of the cylinder portion 62A (inside the cylinder portion 62A). On the other hand, a cross projection 72 having an insertion groove 72A formed in a substantially cross shape in plan view is erected from the upper surface of the disc portion 62B. Further, the disc portion 62B is provided with a through hole 74 that penetrates the disc portion 62B in the thickness direction.

  The through hole 74 is divided into four so as to communicate with the radially outer portion excluding the axial center portion (that is, the intersecting portion) in the insertion groove 72A formed in a cross shape in a plan view. Yes. As a result, each through hole 74 is positioned adjacent to the outside in the radial direction of the sliding contact projection 70 and opens into the cylindrical portion 62A. An annular rib 76 is erected on the outer periphery of the upper end of the base portion 62, and one end portion of a compression coil spring 82 to be described later comes into contact with the upper surface of the disc portion 62 </ b> B between the rib 76 and the cross projection 72. A spring receiving surface 78 is provided.

  The brake member 60 described above is inserted in the cylindrical portion 34 of the reel hub 32 so as to be movable in the vertical direction (the axial direction of the reel 28) and substantially coaxially. That is, the brake member 60 moves in the vertical direction, so that the position where the brake gear 66 meshes with the engagement gear 44 of the reel hub 32 (rotation lock position), and the position where the meshing is released (rotation allowable position). Can be taken.

  Further, a cross rib 80 projecting downward from the top plate 14 </ b> A of the case 12 enters the insertion groove 72 </ b> A of the cross protrusion 72 of the brake member 60. The cross rib 80 has a non-rotating shape in which two thin plate pieces are crossed so as to be orthogonal to each other, and engages with the cross protrusion 72 (groove wall of the insertion groove 72A) to thereby provide a brake member. In this configuration, rotation of the 60 cases 12 is prevented. Therefore, the brake member 60 prevents the reel 28 from rotating in a state where the brake gear 66 is engaged with the engagement gear 44 of the reel hub 32.

  Note that the cross rib 80 is maintained in the insertion groove 72A over the entire vertical movement stroke of the brake member 60, and also has a function of guiding the movement direction of the brake member 60 in the vertical direction. It is the composition which fulfills. Furthermore, the cross rib 80 has a projecting piece 80A that extends from a position corresponding to each through hole 74 of the brake member 60 at the lower end thereof. Each of the projecting pieces 80A has a width (length in the radial direction of the brake member 60) corresponding to the longitudinal dimension of the through hole 74, and can enter the different through holes 74.

  Each projecting piece 80A is positioned in the insertion groove 72A when the brake member 60 is positioned at the rotation lock position, and enters each through hole 74 when the brake member 60 is positioned at the release position (rotation allowable position). It protrudes from the lower surface of the disc part 62B (through the through hole 74). Thereby, the cross rib 80 extends not only the rotation of the brake member 60 with respect to the case 12 but also the engagement amount (insertion depth) with the brake member 60 greatly by extending each protruding piece 80A. The inclination of the brake member 60 with respect to the case 12 is suppressed. Further, the cross rib 80 having this configuration improves the guide property of the brake member 60 in the vertical direction. In the present embodiment, the amount of engagement in the axial direction with the brake member 60 located at the rotation lock position of the cross rib 80 including each projecting piece 80A is set sufficiently larger than the entire movement stroke of the brake member 60. ing.

  Further, when the brake member 60 is located at the rotation lock position, radial movement is restricted by the standing rib 48 of the reel 28, and when the brake member 60 is located at the rotation allowable position, interference with the standing rib 48 that rotates together with the reel 28 is prevented. It is configured so that there is no fear. For this reason, the standing rib 48 is positioned close to the reinforcing rib 68 of the ring portion 64 of the brake member 60 positioned at the rotation lock position, and the reinforcing rib of the brake member 60 positioned at the rotation allowable position. The upper part is cut away so that the distance from 68 is equal to or greater than a predetermined value. As a result, the reel 28 is not only restricted to move directly to the case 12, but is also restricted from moving in the radial direction with respect to the case 12 via the brake member 60 in the vicinity of the center of gravity. The mold (with the axis of the reel 28 being the horizontal direction) can be stably loaded.

  A compression coil spring 82 is disposed between the spring receiving surface 78 of the brake member 60 and the top plate 14A. One end of the compression coil spring 82 abuts on the spring receiving surface 78 and the other end abuts on the top plate 14A. The other end projects from the outside of the cross rib 80 on the top plate 14A. It is located inside the formed annular wall 83 and is not displaced in the radial direction.

  Due to the biasing force of the compression coil spring 82, the brake member 60 is biased downward, and normally the brake gear 66 is engaged with the engagement gear 44 to reliably prevent inadvertent rotation of the reel 28 (brake member). 60 is positioned at the rotation lock position). Also, the reel 28 that is engaged with the brake member 60 in the engagement gear 44 is biased downward by this biasing force and is brought into contact with the annular rib 22 so that it does not rattle in the case 12.

  The recording tape cartridge 10 also includes a clutch member 84 that is operated from the outside when the reel 28 is unlocked by the brake member 60. The clutch member 84 is disposed between the bottom portion 36 of the reel 28 and the brake member 60, and has a clutch main body 86 formed in a substantially columnar shape. The outer diameter of the clutch body 86 is slightly smaller than the inner diameter of the through hole 50 of the reel plate 54, that is, the inner diameter of the through hole 50 that matches the inner diameter of the clutch boss portion 52.

  Further, as shown in FIG. 6B, the clutch body 86 has a flat axial center upper end surface that is a sliding contact surface 86 </ b> A that always contacts the sliding contact projection 70 of the brake member 60. Further, a flat lower end surface around a lightening hole 86B provided to open downward in the clutch body 86 is a pressing operation surface 86C. The clutch member 84 is configured to move upward against the urging force of the compression coil spring 82 and move the brake member 60 to the rotation allowable position when the pressing operation surface 86C is pressed.

  Further, the clutch member 84 includes a rotation restricting rib 88 that protrudes radially outward from the outer peripheral surface of the clutch body 86. A plurality of rotation restricting ribs 88 (three in the present embodiment) are provided at equal intervals in the circumferential direction of the clutch main body 86, and the rotation restricting ribs 88 are arranged radially in plan view. Each rotation restricting rib 88 extends above the sliding contact surface 86A so as to straddle (continue to) the upper end surface around the sliding contact surface 86A of the clutch body 86 and the outer peripheral surface near the upper end surface. It protrudes.

  Each rotation restricting rib 88 enters a rotation restricting groove 90 that is recessed from the inner edge of the clutch boss 52. That is, three rotation restricting grooves 90 are provided at equal intervals in the circumferential direction of the clutch boss portion 52. Each rotation regulating groove 90 opens upward at the upper end of the clutch boss portion 52. As a result, the clutch member 84 can move in the vertical direction while being guided by the rotation restricting rib 90 of the clutch boss portion 52 at the rotation restricting rib 88.

  Further, each rotation restricting rib 88 maintains the state where it enters the rotation restricting groove 90 of the boss portion 52 for the clutch even when the clutch member 84 moves upward and positions the brake member 60 at the rotation allowable position. It has become. As a result, the clutch member 84 cannot rotate relative to the reel 28, that is, is configured to always rotate integrally with the reel 28.

  Furthermore, since each rotation restricting groove 90 is closed at the lower end portion of the clutch boss portion 52, the rotation restricting rib 88 and the rotation restricting groove 90 may prevent the clutch member 84 from falling off the reel hub 32. However, in this embodiment, the clutch member 84 includes a seating rib 92 that prevents the clutch member 84 from dropping from the reel hub 32, separately from the rotation restricting rib 88.

  A plurality of seating ribs 92 are provided at equal intervals in the circumferential direction of the clutch main body 86, and a total of three seating ribs 92 are provided in the circumferential intermediate portion between the rotation regulating ribs 88 in this embodiment. Each seat rib 92 protrudes upward and radially outward so as to straddle the upper end surface around the sliding contact surface 86A of the clutch body 86 and the outer peripheral surface near the upper end surface, similarly to the rotation restricting rib 88. They are arranged radially in plan view.

  Each seat rib 92 enters a stopper groove 94 that is recessed from the inner edge of the clutch boss 52. That is, the stopper grooves 94 are provided in the circumferential intermediate portion of the rotation restricting grooves 90 at equal intervals in the circumferential direction of the clutch boss portion 52. Each stopper groove 94 opens upward at the upper end of the boss portion 52 for clutch, and the upper surface of the bottom portion closing the lower end portion is a stopper surface 94A. Each seating rib 92 is configured such that the lower end surface of the seating rib 92 abuts (sits) the stopper surface 94A when the brake member 60 is in the rotation lock position.

  Here, as for the clutch member 84, the clutch main body 86, the rotation control rib 88, and the seating rib 92 are integrally formed by resin molding. As shown in FIG. 6B, the rotation restricting ribs 88 and the seating ribs 92 have the same height at the upper end surfaces, but the rotation restricting ribs 88 are lower at the lower end surfaces. It is located below the seating rib 92. Correspondingly, the rotation restricting groove 90 and the stopper groove 94 opened at the upper end of the clutch boss portion 52 respectively coincide with each other at the upper end, but the rotation restricting groove 90 is located more than the stopper surface 94A of the stopper groove 94. The bottom is located below. In other words, the rotation restriction rib 88 is longer in the vertical direction than the seating rib 92, and the rotation restriction groove 90 is deeper in the vertical direction than the stopper groove 94.

  This increases the amount of engagement between the rotation restricting rib 88 and the clutch boss portion 52 (the amount that can be inserted into the rotation restricting groove 90), thereby reducing the stress received from the reel 28 when the reel 28 rotates. This is because the guide performance when the clutch member 84 moves up and down is improved, and rattling of the clutch member 84 is also suppressed when the brake member 60 is positioned at the rotation-permitted position.

  Further, as shown in FIG. 6A, in order to further suppress this rattling, the clearance C1 on one side in the circumferential direction between the rotation restricting rib 88 and the rotation restricting groove 90 is when the clutch member 84 moves up and down. The sliding resistance is small enough not to be excessive. Further, the rotation restricting rib 88 is thinned so that its thickness (thickness in the circumferential direction of the clutch member 84) does not cause a problem in strength, and is configured to have high dimensional accuracy by resin molding. Therefore, the clearance C1 can be further reduced.

  On the other hand, the thickness of the seating rib 92 (thickness in the circumferential direction of the clutch member 84) is sufficiently larger than the thickness of the rotation restricting rib 88. Thus, the seating rib 92 is configured to ensure sufficient rigidity against the urging force of the compression coil spring 82 that acts via the brake member 60 when it is in contact with the stopper surface 94A. Further, the seating rib 92 is thick, so that the resin fluidity at the time of molding is relatively poor. However, as the seating rib 92 is shorter than the rotation restricting rib 88 as described above, it is hardly affected by the poor fluidity. It is configured.

  Furthermore, the seat rib 92 that is formed thick and has a dimensional accuracy inferior to that of the rotation restricting rib 88 is not required to have a function of suppressing rattling of the clutch member 84, and has a clearance C2 in the circumferential direction with the stopper groove 94. The clearance is sufficiently larger than the clearance C1. Accordingly, the seating rib 92 is configured not to cause or remarkably suppress the sliding resistance when the clutch member 84 moves up and down.

  Further, each rotation regulating rib 88 and seating rib 92 passes through the disc portion 62B of the brake member 60 when the clutch member 84 moves upward and the brake member 60 is positioned at the rotation allowable position. The height (the position of the upper end) is determined so as not to interfere with the protruding piece 80A (see FIG. 3).

  As described above, in the clutch member 84 described above, the clutch body 86 is inserted into the through hole 50 in a state where the rotation restricting ribs 88 are inserted into the different rotation restricting grooves 90 and the seating ribs 92 are inserted into the different stopper grooves 94, respectively. The through hole 54A is inserted. Normally, each seating rib 92 is held in contact with the stopper surface 94 </ b> A by the urging force of the compression coil spring 82 acting via the brake member 60.

  In this state, the lower end surface of each rotation restricting rib 88 is slightly separated from the bottom surface of the rotation restricting groove 90 (see FIG. 6B), and the vertical position of the pressing operation surface 86C is the position of the reel gear 42. It is located slightly above the tooth tip (0.1 mm in this embodiment). The clutch member 84 is pushed upward by the release portion 114 of the drive device as the reel gear 42 meshes with the drive gear 108 of the drive device.

  Next, the operation of the present embodiment will be described.

  In the recording tape cartridge 10 having the above configuration, as shown in FIG. 2, when not in use, the brake member 60 is positioned at the rotation lock position by the urging force of the compression coil spring 82 and the brake gear 66 is engaged with the engagement gear 44. I am letting. For this reason, the reel 28 is prevented from rotating with respect to the case 12. At this time, the reel gear 42 of the reel 28 is exposed from the gear opening 20, and the clutch main body 86 of the clutch member 84 is inserted into the through hole 50 and the through hole 54 </ b> A and faces the gear opening 20.

  On the other hand, when using the magnetic tape T, as shown in FIG. 1B, the recording tape cartridge 10 is loaded into a bucket (not shown) of the drive device along the arrow A direction. When the recording tape cartridge 10 is loaded into the bucket to a predetermined depth, the bucket descends, and the rotary shaft 100 of the drive device relatively approaches (moves upward) toward the gear opening 20 of the case 12 to move the reel. 28 is held. Specifically, the rotating shaft 100 meshes the drive gear 108 with the reel gear 42 while attracting and holding the reel plate 54 in a non-contact manner by the magnet 110.

  As the reel gear 42 and the drive gear 108 mesh with each other, that is, with the relative movement of the rotary shaft 100 in the axial direction near the case 12, the release portion 114 of the rotary shaft 100 comes into contact with the pressing operation surface 86C of the clutch member 84, The clutch member 84 is pushed upward against the urging force of the compression coil spring 82. As a result, the brake member 60 that is in contact with the clutch member 84 at the sliding contact projection 70 also moves upward, and the engagement between the brake gear 66 and the engagement gear 44 of the brake member 60 is released.

  That is, the brake member 60 reaches a relative rotation allowable position with respect to the reel 28. When the release portion 114 comes into contact with the pressing operation surface 86C and the rotary shaft 100 relatively moves upward, the reel 28 together with the clutch member 84 and the brake member 60 (relative position) against the urging force of the compression coil spring 82. And the brake member 60 reaches an absolute rotation allowable position (relative to the case 12), and the lower flange 38 is separated from the annular rib 22 (tapered surface 22A). As described above, the reel 28 floats in the case 12 and can rotate in a non-contact state with the inner surface of the case 12.

  At this time, as the bucket, that is, the recording tape cartridge 10 descends in the drive device, the positioning pins of the drive device enter the positioning holes 24 and 26 of the case 12, respectively, and the positioning surfaces 24A and 26A of the case 12 respectively. The positioning surface of the drive device comes into contact with this. Thereby, the recording tape cartridge 10 is positioned in the horizontal direction and the vertical direction with respect to the drive device.

  Then, the drawing-out means of the drive device pulls out the leader block 30 from the case 12 and guides it to the take-up reel of the drive device while engaging the drawing pin (not shown) with the engaging recess 30A of the leader block 30. Further, the leader block 30 is inserted into the take-up reel, and the arc surface 30B constitutes a part of the take-up surface on which the magnetic tape T is taken up.

  In this state, when the leader block 30 rotates integrally with the take-up reel, the magnetic tape T is drawn out from the case 12 through the opening 18 while being wound around the reel hub of the take-up reel. At this time, the reel 28 of the recording tape cartridge 10 rotates in synchronization with the take-up reel by the rotational force of the rotating shaft 100 transmitted by the drive gear 108 meshing with the reel gear 42.

  Then, information is recorded on the magnetic tape T or information recorded on the magnetic tape T is reproduced by a recording / reproducing head disposed along a predetermined tape path of the drive device. At this time, the sliding contact projection 70 of the brake member 60 that cannot rotate with respect to the case 12 is in sliding contact with the sliding contact surface 86 </ b> A of the clutch member 84 that rotates with the reel 28 with respect to the case 12.

  On the other hand, when the magnetic tape T is rewound onto the reel 28 and the leader block 30 is held near the opening 18 of the case 12, the bucket loaded with the recording tape cartridge 10 is raised. Then, the meshing between the reel gear 42 and the drive gear 108 is released, the contact between the release portion 114 and the sliding contact surface 86A of the clutch member 84 is released, and the clutch member 84 is braked by the urging force of the compression coil spring 82. It moves downward together with the member 60 (while maintaining the contact state).

  Thereby, each seating rib 92 of the clutch member 84 abuts against the stopper surface 94 </ b> A, and the braking gear 66 of the brake member 60 meshes with the engagement gear 44. That is, the brake member 60 returns to the rotation lock position where the reel 28 is prevented from rotating with respect to the case 12. Further, as the brake member 60 and the clutch member 84 move by the urging force of the compression coil spring 82, the reel 28 also moves downward, and the reel gear 42 is brought into contact with the lower flange 38 against the annular rib 22. Is returned to the initial state where it is exposed from the gear opening 20. In this state, the recording tape cartridge 10 is discharged from the bucket.

  By the way, in the present invention, as shown in FIGS. 7 and 8, an annular rib 55 having a height corresponding to the thickness of the reel plate 54 is formed at the inner edge portion of the through hole 54 </ b> A formed in the central portion of the reel plate 54. Is forming.

  When the reel plate 54 is insert-molded, the reel plate 54 itself may be deformed due to the injection pressure of the resin during molding and the shrinkage stress of the resin after insert molding. By forming the annular rib 55 at the inner edge of the hole 54A, the rib 55 improves the strength of the reel plate 54 itself.

  Thereby, the planarity of the reel plate 54 can be obtained, and the meshing between the reel gear 42 around the reel plate 54 and the drive gear 108 of the rotary shaft 100 (see FIG. 3) of the drive device is also good.

  Further, by providing such ribs 55, when the resin shrinks after molding, the biting of the resin on the ribs 55 becomes strong, and the reel plate 54 can be firmly fixed to the bottom 36 of the reel hub 32. For this reason, it is not necessary to separately form a retaining hole for insert molding in the reel plate 54, so that the processing steps of the reel plate 54 can be reduced and the cost can be reduced.

  Here, the height of the rib 55 is made substantially the same as the thickness of the reel plate 54, but it may be in the range of about 1/2 to 2 times the thickness of the reel plate 54.

  Here, SPCC is used as the material of the reel plate 54, but it is not limited to this because any magnetic material may be used. For example, SUS410 or the like may be used.

  Furthermore, in the above-described embodiment, the configuration in which the recording tape cartridge 10 has the leader block 30 is shown. However, the recording tape cartridge 10 is not limited to this, and for example, a small circle is formed as a leader member at the tip of the magnetic tape T. A structure in which a columnar leader pin is attached may be used, or a structure having a shielding member (such as a slide door that moves along a predetermined straight line or arc) that opens and closes the opening 18 may be used.

  The magnetic tape T is used as the recording tape. However, the present invention is not limited to this, and the recording tape is a long tape-like information recording / reproducing medium capable of recording information and reproducing the recorded information. Needless to say, the recording tape cartridge is applicable to any recording / reproducing recording tape.

(A) is a schematic perspective view of the recording tape cartridge as viewed from above, and (B) is a schematic perspective view of the recording tape cartridge as viewed from below. FIG. 3 is a schematic cross-sectional view when the reel of the recording tape cartridge according to the embodiment of the invention is in a rotation lock position. FIG. 3 is a schematic cross-sectional view when the reel of the recording tape cartridge according to the embodiment of the invention is in a rotation allowable position. 1 is a schematic exploded perspective view of a reel of a recording tape cartridge, a brake member, and a rotary shaft of a drive device according to an embodiment of the present invention as viewed from above. 1 is a schematic exploded perspective view of a reel and a brake member of a recording tape cartridge according to an embodiment of the present invention as viewed from below. (A) is a schematic plan view which shows the assembly | attachment state to the reel of a clutch member, (B) is a schematic sectional drawing which shows the assembly | attachment state to the reel of a clutch member. It is a perspective view which shows the reel plate single item of the reel which concerns on embodiment of this invention. It is an enlarged view which shows the state by which the reel plate of the reel which concerns on embodiment of this invention was insert-molded.

Explanation of symbols

10 Recording tape cartridge 28 Reel 32 Reel hub (hub)
54 reel plate 55 rib (standing wall)

Claims (2)

  A through hole is formed in the center of a reel plate which is provided on the bottom surface of a bottomed cylindrical hub around which the recording tape is wound and which can be magnetically attached to the rotary shaft on the drive device side and is insert-molded. A reel characterized in that an annular standing wall is formed in the part.   2. The reel according to claim 1, wherein the height of the standing wall is in a range of about 1/2 to 2 times the thickness of the reel plate.

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