JP5718266B2 - reel - Google Patents

Description

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

  A reel hub including a pair of upper flange plate and lower flange plate, and a reel hub formed integrally with the lower flange plate is known (for example, see Patent Document 1).

  The reel hub disclosed in Patent Document 1 connects a central part in which a hub hole into which a rotating shaft is inserted is formed, a cylindrical winding part around which a magnetic tape is wound, and the central part and the winding part. And a reinforcing rib.

  Further, the lower flange plate disclosed in Patent Document 1 is formed with an annular deformation absorbing groove along the outer peripheral surface of the winding portion. By this deformation absorbing groove, the deformation of the lower flange plate is suppressed by absorbing the elastic deformation of the wound portion that tilts toward the center due to the winding pressure of the magnetic tape.

JP-A-10-199195

  However, in the reel hub disclosed in Patent Document 1, when the winding portion tilts toward the center portion due to the winding pressure of the magnetic tape, the center portion is pressed radially inward via the reinforcing rib. Thereby, if the top wall part of the center part of a reel hub deform | transforms, the relative position of the said ceiling wall part and a winding part may shift | deviate to the axial direction of a winding part. In other words, if the top wall portion at the center of the reel hub is deformed, the entire reel hub may be displaced in the axial direction. As a result, the winding portion is displaced in the axial direction with respect to the magnetic tape supplied to the winding portion, causing a change in the traveling position of the magnetic tape in the drive and a winding deviation.

  In view of the above fact, an object of the present invention is to obtain a reel capable of suppressing the relative position between the lid portion of the hub body portion and the winding portion from shifting in the axial direction of the winding portion.

The reel according to claim 1 is formed in a cylindrical shape with a hub main body portion having a cylindrical main body peripheral wall portion and a lid portion provided on one end side in the axial direction of the main body peripheral wall portion. A winding portion in which the main body peripheral wall portion is disposed and a recording tape is wound on an outer peripheral surface; and an outer periphery of the winding portion and the main body peripheral wall portion that projects radially inward from an inner peripheral surface of the winding portion A connecting portion that connects a surface, and a deformation absorbing portion that is formed in the connecting portion and that is elastically deformed to displace the winding portion toward the peripheral wall portion of the main body, and the connecting portion includes the winding An outer projecting portion projecting radially inward from the inner peripheral surface of the portion, and an inner projecting portion projecting radially outward from the outer peripheral surface of the main body peripheral wall portion, and the deformation absorbing portion is the outer The inner overhanging portion is positioned on the opening side of the main body peripheral wall portion opposite to the lid portion with respect to the overhanging portion. A stepped portion.

According to the reel of the first aspect , the inner projecting portion of the connecting portion is positioned on the opening side opposite to the lid portion of the main body peripheral wall portion with respect to the outer projecting portion by the step portion. Thus, when the outer peripheral surface of the winding portion is pressed toward the main body peripheral wall by the winding pressure of the recording tape equal to or greater than a predetermined value, the stepped portion is located on the inner side of the main peripheral wall positioned on the opening side opposite to the lid. It is elastically deformed so as to tilt toward the peripheral wall of the main body with the connecting portion with the protruding portion as a fulcrum.

  Here, when the winding portion presses the main body peripheral wall portion inward in the radial direction via the connecting portion, the main body peripheral wall portion has a moment that tilts the main body peripheral wall portion inward in the radial direction with the connection portion with the lid portion as a fulcrum. (Hereinafter referred to as “inner moment”). On the other hand, when the stepped portion is elastically deformed as described above, a moment (hereinafter referred to as “the side of the winding portion”) is tilted to the outer peripheral wall portion of the main body peripheral wall portion with the connecting portion with the lid portion as a fulcrum. Acts as "outer moment". Since the inner moment is canceled by this outer moment, the deformation of the main body peripheral wall portion toward the inner side in the radial direction is further suppressed.

According to a second aspect of the present invention , in the reel according to the first aspect , the inner projecting portion projects outward in the radial direction from the opening-side end portion of the peripheral wall portion of the main body.

According to the reel of the second aspect , the inner projecting portion projects outward in the radial direction from the opening side end portion of the main body peripheral wall portion. Therefore, compared with the configuration in which the inner overhanging portion projects radially outward from the position where the inner overhanging portion is shifted from the opening side end portion of the main body peripheral wall portion to the lid side, the step portion is made thin in the axial direction of the entire reel. The axial length of the peripheral wall portion of the main body can be increased. As a result, the stepped portion is easily elastically deformed toward the main body peripheral wall portion with the connecting portion with the inner overhanging portion as a fulcrum, so that deformation of the main body peripheral wall portion in the radial direction is further suppressed.

The reel according to claim 3 is formed in a cylindrical shape with a hub main body portion having a cylindrical main body peripheral wall portion and a lid portion provided on one end side in the axial direction of the main body peripheral wall portion. A winding portion in which the main body peripheral wall portion is disposed and a recording tape is wound on an outer peripheral surface; and an outer periphery of the winding portion and the main body peripheral wall portion that projects radially inward from an inner peripheral surface of the winding portion A connecting portion that connects a surface, and a deformation absorbing portion that is formed in the connecting portion and that is elastically deformed to displace the winding portion toward the peripheral wall portion of the main body, and the connecting portion includes the winding an outer overhang portion projecting from the inner circumferential surface parts radially inwardly, is arranged opposite the opening side and the lid portion in the main body peripheral wall than the outside protruding portion, from the outer peripheral surface of the peripheral body wall portion An inner projecting portion projecting outward in the radial direction, and the deformation absorbing portion includes the winding portion and the book. The axial direction of the main body peripheral wall portion is arranged between the peripheral wall portion and the longitudinal direction, one end side in the longitudinal direction is connected to the winding portion via the outer overhanging portion, and the other end side in the longitudinal direction is connected to the inner overhanging portion. It is a wall-shaped part connected with the said main body surrounding wall part via the part.

According to the reel of the third aspect , the inner overhanging portion is disposed on the opening side opposite to the lid portion of the main body peripheral wall portion with respect to the outer overhanging portion. The inner projecting portion and the outer projecting portion are connected by a wall-shaped portion. Thereby, when the outer peripheral surface of the winding part is pressed toward the main body peripheral wall by the winding pressure of the recording tape of a predetermined value or more, it is arranged on the opening side opposite to the lid on the main peripheral wall rather than the outer overhanging part. The wall-shaped portion is elastically deformed so that the wall-shaped portion tilts toward the peripheral wall portion of the main body with the connecting portion with the inner projecting portion as a fulcrum.
Here, when the winding portion presses the main body peripheral wall portion inward in the radial direction via the connecting portion, the main body peripheral wall portion has a moment that tilts the main body peripheral wall portion inward in the radial direction with the connection portion with the lid portion as a fulcrum. (Hereinafter referred to as “inner moment”). On the other hand, when the wall-like portion is elastically deformed as described above, the main body peripheral wall portion has a moment for tilting the main body peripheral wall portion radially outward (winding portion side) with the connection portion with the lid as a fulcrum. "Outer moment" is applied. Since the inner moment is canceled by this outer moment, the deformation of the main body peripheral wall portion toward the inner side in the radial direction is further suppressed.

A reel according to a fourth aspect is the reel according to any one of the first to third aspects, wherein the outer overhanging portion protrudes radially inward from an axial center portion of the winding portion. Yes.

According to the reel which concerns on Claim 4 , the outer side overhang | projection part of the connection part has projected over the radial direction inner side from the axial direction center part of the winding part. That is, the axial center part of the winding part is supported by the main body peripheral wall part via the connecting part. Thereby, when the outer peripheral surface of the winding part is pressed to the main body peripheral wall part side by the winding pressure of the recording tape, each of both ends in the axial direction of the winding part has the axial center part of the winding part as a fulcrum. Since the main body is bent toward the peripheral wall, the deviation of the amount of bending at both ends in the axial direction of the winding portion is reduced. Therefore, the winding shift | offset | difference to the axial direction one side of the winding part of a recording tape is suppressed.

The reel according to a fifth aspect is the reel according to any one of the first to fourth aspects, wherein the stepped portion extends in an annular shape along the outer peripheral surface of the peripheral wall portion of the main body.

According to the reel of the fifth aspect, since the step portion extends annularly along the outer peripheral surface of the main body peripheral wall portion, deformation of the main body peripheral wall portion in the radial direction is suppressed over the entire periphery of the main body peripheral wall portion. .

A reel according to a sixth aspect is the reel according to any one of the first to fifth aspects, wherein the hub main body portion is disposed on the lid portion with respect to a housing in which the hub main body portion is accommodated. A positioning portion for positioning is formed.

According to the reel of the sixth aspect , the positioning part for positioning the hub main body part with respect to the housing is formed on the lid part. Accordingly, by suppressing the deformation of the lid portion, the positional deviation of the hub body portion with respect to the housing is suppressed.

The reel according to claim 7 is the reel according to any one of claims 1 to 6 , wherein a housing portion that houses a motor that rotationally drives the hub body portion is provided in the body peripheral wall portion. Is formed.

According to the reel of the seventh aspect of the invention, the housing or the like in which the reel is housed by housing the motor that rotationally drives the hub body portion in the housing portion formed inside the body peripheral wall portion of the hub body portion. Thinning can be achieved.

  As described above, according to the reel of the present invention, it is possible to suppress the relative position between the lid portion of the hub main body portion and the winding portion from shifting in the axial direction of the winding portion.

It is a perspective view which shows the state in which the reel which concerns on 1st Embodiment of this invention was integrated in the drive device. It is a disassembled perspective view which shows the reel shown by FIG. It is a perspective view which shows the longitudinal cross section along the axial direction of the reel shown by FIG. It is the top view which looked at the reel shown by FIG. 1 from the upper flange side. FIG. 5 is a cross-sectional view corresponding to the cross-sectional view taken along line 5-5 of FIG. It is sectional drawing equivalent to FIG. 5 which shows the connection part in 2nd Embodiment of this invention. It is sectional drawing equivalent to FIG. 5 which shows the connection part in 3rd Embodiment of this invention. It is sectional drawing equivalent to FIG. 5 which shows the coupling | bond part of the upper flange and lower flange in 4th Embodiment of this invention. (A) And (B) is sectional drawing equivalent to the partially expanded view of FIG. 3 which shows the analytical model of the reel which concerns on an Example. It is sectional drawing equivalent to the partially expanded view of FIG. 3 which shows the analytical model of the reel which concerns on a comparative example. It is a graph which shows the analysis result of each analysis model concerning an example and a comparative example.

  Hereinafter, a reel according to an embodiment of the present invention will be described with reference to the drawings. For convenience of explanation, the arrow UP in FIG. 1 is the upward direction, the arrow DO is the downward direction, and the rotation axis direction of the reels 10 and 20 according to this embodiment is the vertical direction (height direction).

  First, the first embodiment will be described.

  The pair of reels 10 and 20 according to the first embodiment are made of a synthetic resin such as polycarbonate (PC), for example, and as shown in FIG. 1, the casing 52 (the bottom plate 54 in FIG. 1) of the drive device 50 is used. And only three struts 56 are shown).

  The reel 10 is used for feeding the recording tape T, and the reel 20 is used for winding the recording tape T. The recording tape T fed from the reel 10 is recorded and reproduced while being wound on the reel 20. The head 60 is in sliding contact. The recording / reproducing head 60 records data on the recording tape T and reads data recorded on the recording tape T.

  Note that a plurality of tape guides 58 are provided on the bottom plate 54 on both sides of the recording / reproducing head 60 (two in the drawing are a total of four), and are drawn out from the reel 10 to be reel 20. The recording tape T that is wound around is guided by each tape guide 58.

  Each of the reels 10 and 20 includes reel hubs 12 and 22 constituting an axial center portion, annular upper flanges 14 and 24 provided on the upper end side thereof, and annular lower flanges 16 and 26 provided on the lower end side thereof. It is comprised including.

  A recording tape T such as a magnetic tape as an information recording / reproducing medium is wound around the outer peripheral surface of the reel hub 12 in the reel 10. When the reel 10 is rotationally driven in a predetermined direction, the recording tape T wound around the outer peripheral surface of the reel hub 12 is fed out toward the reel 20 while being guided by the upper flange 14 and the lower flange 16. The recording tape T fed out from the reel 10 is wound around the outer peripheral surface of the reel hub 22 of the reel 20 while being guided by the upper flange 24 and the lower flange 26 of the reel 20 that is rotationally driven in the same direction as the reel 10. .

  Since the reel 10 and the reel 20 have the same configuration, the reel 10 will be described below as an example, and the description of the reel 20 will be omitted. As shown in FIG. 2, the reel hub 12 connects the hub body 70, the cylindrical winding part 80 provided on the outer periphery of the hub body 70, and the hub body 70 and the winding part 80. And a connecting portion 90.

  As shown in FIG. 3, the hub main body portion 70 is provided on a cylindrical main body peripheral wall portion 72 that is arranged with the axial direction being the vertical direction, and an upper end portion of the main body peripheral wall portion 72. It has a disk-shaped lid (top wall) 74 that closes the opening at one axial end. Inside the main body peripheral wall portion 72, a housing portion S in which the motor 18 (see FIG. 5) serving as a drive source provided in the drive device 50 is housed is formed. An opening 76 is formed at the lower end (the other end in the axial direction) of the main body peripheral wall portion 72. The motor 18 can be accommodated in the accommodating portion S through the opening 76. The lid portion 74 is not limited to the upper end portion of the main body peripheral wall portion 72 but can be provided on the upper end side of the main body peripheral wall portion 72.

  A boss portion 78 that protrudes from the upper surface and the lower surface of the lid portion 74 is formed at the center portion (rotation center portion) of the lid portion 74. The boss portion 78 is formed with a radial positioning hole 40 as a positioning portion that penetrates the boss portion 78 in the vertical direction. By inserting (fitting) a radial positioning pin as a housing-side positioning portion (not shown) provided in the motor 18 into the radial positioning hole 40, the hub main body 70 is coaxial with the rotation shaft of the motor 18. The hub body 70 is disposed in the radial direction with respect to the rotation axis of the motor 18.

  The lower surface of the boss portion 78 is an axial positioning surface (axial reference surface) 78A as a positioning portion for positioning the reel 10 in the vertical direction (axial direction) with respect to the casing 52 of the drive device 50. . The axial positioning surface 78A is brought into contact with an axial positioning surface as a housing side positioning portion (not shown) provided in the motor 18 in a state where the radial positioning pin described above is inserted into the radial positioning hole 40. As a result, the reel 10 is positioned in the vertical direction (axial direction) with respect to the casing 52 of the drive device 50.

  Furthermore, as shown in FIG. 4, a plurality of (three in the present embodiment) screw holes 36 penetrating the lid portion 74 in the plate thickness direction are formed in the lid portion 74. The plurality of screw holes 36 are formed at equal intervals on the concentric circumference of the lid 74. The rotation of the motor 18 is performed by fastening a rotation flange (not shown) as a rotation member integrally provided on the rotation shaft of the motor 18 and the lid portion 74 with screws (not shown) inserted into the screw holes 36. The shaft and the hub main body 70 are rotatable together.

  As shown in FIG. 5, a winding portion 80 around which the recording tape T (see FIG. 1) is wound around an outer peripheral surface (winding surface) 80 </ b> A is provided around the main body peripheral wall portion 72 of the hub main body portion 70. It has been. The winding part 80 is formed in a cylindrical shape, and is arranged with the axial direction as the vertical direction. A main body peripheral wall portion 72 of the hub main body portion 70 is disposed inside (inside) the winding portion 80. The winding portion 80 and the main body peripheral wall portion 72 are connected by a connecting portion 90.

  In addition, the cylinder shape in this embodiment is a concept including not only a strict cylindrical shape but also a substantially cylindrical shape formed in a cylindrical shape as a whole.

  The connecting portion 90 is formed in a ring shape as a whole, and an outer peripheral surface 80B of the winding portion 80 is coupled to the outer peripheral portion thereof, and an outer peripheral surface 72A of the main body peripheral wall portion 72 of the hub main body portion 70 is coupled to the inner peripheral portion thereof. The winding portion 80 is supported with respect to the main body peripheral wall portion 72. Specifically, the connecting portion 90 includes an outer projecting portion 90 </ b> A that projects radially inward from the inner peripheral surface 80 </ b> B of the winding portion 80 and an outer peripheral surface 72 </ b> A of the main body peripheral wall portion 72 of the hub main body portion 70. And a step part 90C as a deformation absorbing part connecting the outer projecting part 90A and the inner projecting part 90B.

  The outer projecting portion 90 </ b> A projects radially inward from the central portion (vertical direction) in the vertical direction on the inner peripheral surface 80 </ b> B of the winding unit 80. That is, the connecting portion 90 supports the central portion in the axial direction of the winding portion 80 with respect to the main body peripheral wall portion 72 of the hub main body portion 70. The upper surface and the lower surface of the outer projecting portion 90A are welding surfaces to which the pair of upper flange 14 and lower flange 16 are welded.

  A cylindrical lower cylindrical portion 17 extending upward is integrally formed on the inner peripheral edge of the lower flange 16. The lower cylindrical portion 17 is fitted into the winding portion 80 from the lower end of the winding portion 80. On the upper end portion of the lower cylindrical portion 17, an overhang portion 35 that projects annularly toward the inside in the radial direction is integrally formed. As shown in FIG. 2, a plurality of energy directors (hereinafter referred to as “ED”) 42 serving as welding margins are projected on the upper surface of the overhanging portion 35.

  The plurality of EDs 42 are projected in two rows with a predetermined interval in the circumferential direction of the overhang portion 35 and with a predetermined interval in the radial direction. Thereby, ultrasonic oscillation energy for melting the ED 42 is efficiently transmitted to each ED 42 while increasing the welding area. In a state where these EDs 42 are in contact with the lower surface of the outer overhanging portion 90A of the connecting portion 90, the upper surface of the overhanging portion 35 is moved outward by applying ultrasonic oscillation energy to each ED 42 and melting each ED 42. It is welded to the lower surface of the overhang portion 90A.

  Further, as shown in FIG. 5, when the upper surface of the overhang portion 35 and the lower surface of the outer overhang portion 90 </ b> A are welded, the lower flange 16 protrudes radially outward from the lower end surface 80 </ b> L of the winding portion 80. It is supported by the hub body 70. At this time, the upper surface 16U of the lower flange 16 is brought into contact with the lower end surface 80L of the winding portion 80, and the lower flange 16 is supported by the lower end surface 80L. Thereby, deformation of the winding part 80 and the lower flange 16 due to the winding pressure F of the recording tape T is suppressed.

  Similarly, a cylindrical upper cylindrical portion 15 extending downward is integrally formed on the inner peripheral edge portion of the upper flange 14. The upper cylindrical portion 15 is fitted into the winding portion 80 from the upper end of the winding portion 80. A projecting portion 33 that projects annularly toward the inside in the radial direction is integrally formed at the lower end portion of the upper cylindrical portion 15. Similar to the lower cylindrical portion 17 of the lower flange 16, a plurality of EDs (not shown) project from the lower surface of the overhang portion 33, and these EDs are welded to the upper surface of the outer overhang portion 90 </ b> A of the connecting portion 90. As a result, the upper flange 14 is supported by the hub body 70 in a state where the upper flange 14 protrudes radially outward from the upper end surface 80U of the winding portion 80. The lower surface 14L of the upper flange 14 is in contact with the upper end surface 80U of the winding portion 80, and the upper flange 14 is supported by the upper end surface 80U. Thereby, the deformation | transformation of the winding part 80 and the upper flange 14 by the winding pressure F of the recording tape T is suppressed. Note that the upper flange 14 and the lower flange 16 have the same shape.

  On the inner peripheral part of the outer projecting part 90A, the inner projecting part 90B is positioned on the opening 76 side (one axial direction side) of the hub main body part 70 (main body peripheral wall part 72) with respect to the outer projecting part 90A. A stepped portion 90C is formed. The step portion 90 </ b> C as a deformation absorbing portion is formed in a cylindrical shape, and extends downward from the inner peripheral portion of the hub main body portion 70 through the inside of the protruding portion 35 of the lower flange 16. That is, the stepped portion 90C extends to the opening 76 side of the hub main body 70 with respect to the outer overhanging portion 90A. The stepped portion 90C is disposed with a space between the hub body portion 70 and the main body peripheral wall portion 72, and is annularly formed along the outer peripheral surface 72A of the main body peripheral wall portion 72 as shown in FIG. It extends.

  As shown in FIG. 5, the outer peripheral portion of the inner overhang portion 90B is connected to the lower end portion of the step portion 90C. The inner projecting portion 90B is formed in an annular shape, and projects outward from the lower end portion (end portion on the opening 76 side) 72L of the main body peripheral wall portion 72 of the hub main body portion 70 in the radial direction. That is, the inner overhanging portion 90 </ b> B is connected to the main body peripheral wall portion 72 at a position shifted in the axial direction of the main body peripheral wall portion 72 with respect to the lid portion 74. The inwardly projecting portion 90B supports the stepped portion 90C so as to be tiltable toward the main body peripheral wall portion 72 side. In addition, an annular groove 92 is formed between the main body peripheral wall 72 and the step 90C. By this groove portion 92, a deformation space (tilt space) of the step portion 90C is secured.

  Furthermore, the connecting portion (joining portion) 90D between the stepped portion 90C and the inner overhanging portion 90B is positioned below the lower end surface 80L of the winding portion 80, and the height (length) of the stepped portion 90C in the axial direction is long. L) L is increased.

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

  According to the reel 10 according to the present embodiment, as shown in FIG. 5, the accommodating portion S is formed inside the main body peripheral wall portion 72 of the hub main body portion 70. By housing the motor 18 that rotationally drives the hub body 70 in the housing portion S, the casing 52 of the drive device 50 can be thinned.

  On the other hand, when the housing portion S is formed inside the hub main body 70, when the outer peripheral surface 80A of the winding portion 80 is pressed toward the main body peripheral wall 72 of the hub main body 70 by the winding pressure F of the recording tape T, The lid 74 of the hub main body 70 is easily curved and deformed so as to protrude upward as indicated by a two-dot chain line. When the lid portion 74 is curved and deformed in this way, the winding portion 80 is displaced downward with respect to the axial positioning surface 78A (see FIG. 3) provided on the boss portion 78 of the lid portion 74. The travel position of the recording tape T within the casing 52 and the winding deviation of the recording tape T with respect to the outer peripheral surface 80A of the winding portion 80 are likely to occur. Further, when the radial positioning hole 40 formed in the boss 78 is deformed, the hub main body 70 is inclined with respect to the rotating shaft of the motor 18 (not shown), and recording in the housing 52 of the drive device 50 is performed as described above. There is a possibility that a change in the running position of the tape T and a winding deviation of the recording tape T with respect to the outer peripheral surface 80A of the winding portion 80 may occur.

  On the other hand, in the present embodiment, a step portion 90C is formed in the connecting portion 90 that connects the hub main body portion 70 and the winding portion 80. Due to the stepped portion 90C, the inner projecting portion 90B of the connecting portion 90 is positioned on the lower end portion 72L side of the main body peripheral wall portion 72 with respect to the outer projecting portion 90A. Therefore, when the outer peripheral surface 80A of the winding portion 80 is pressed toward the main body peripheral wall portion 72 by the winding pressure F of the recording tape T, the upper end portion of the stepped portion 90C is moved through the outer projecting portion 90A of the connecting portion 90. It is pressed toward the body peripheral wall 72 side. When the pressing force pressing the upper end portion of the stepped portion 90C toward the main body peripheral wall portion 72 side becomes a predetermined value or more, the stepped portion 90C moves toward the main body peripheral wall portion 72 side with the connecting portion 90D as a fulcrum as a fulcrum. It is elastically deformed so as to tilt, and the winding part 80 is displaced toward the main body peripheral wall part 72 side. Thereby, since the deformation | transformation to the radial inside of the main body surrounding wall part 72 is suppressed, a deformation | transformation of the cover part 74 of the hub main-body part 70 is suppressed. As a result, the travel position change of the recording tape T within the housing 52 of the drive device 50 is suppressed, and the winding deviation of the recording tape T with respect to the outer peripheral surface 80A of the winding unit 80 is suppressed.

  Further, when the outer peripheral surface 80A of the winding portion 80 is pressed toward the main body peripheral wall portion 72 by the winding pressure F of the recording tape T, each of the upper end surface 80U side and the lower end surface 80L side of the winding portion 80 is connected to the connecting portion. The outer projecting portion 90 </ b> A of 90 is bent toward the hub body 70 side. Here, in the present embodiment, the outer projecting portion 90 </ b> A of the coupling portion 90 projects radially inward from the axial central portion of the winding portion 80. That is, the central part in the axial direction of the winding part 80 is supported by the hub body part 70 via the connecting part 90. Thereby, when the outer peripheral surface 80A of the winding part 80 is pressed to the main body peripheral wall part 72 side by the winding pressure F of the recording tape T, each of the upper end face 80U side and the lower end face 80L side of the winding part 80 is The winding portion 80 bends toward the main body peripheral wall portion 72 with the axial center portion as a fulcrum. Thereby, the bias | deviation of the deflection amount of the upper end surface 80U side and the lower end surface 80L side of the winding part 80 is reduced. Therefore, the winding deviation to the axial direction one side (upper or lower) of the winding part 80 of the recording tape T is suppressed.

  Further, the inner projecting portion 90 </ b> B of the connecting portion 90 projects outward in the radial direction from the lower end portion (end portion on the opening 76 side) 72 </ b> L of the main body peripheral wall portion 72. Thereby, when the outer peripheral surface 80A of the winding part 80 is pressed to the main body peripheral wall part 72 side by the winding pressure F of the recording tape T equal to or greater than a predetermined value, the stepped part 90C is positioned on the opening 76 side of the main body peripheral wall part 72. It is elastically deformed toward the main body peripheral wall 72 using the connecting portion 90D with the inner overhanging portion 90B as a fulcrum.

Here, when the winding part 80 presses the main body peripheral wall part 72 radially inward through the connecting part 90, the main body peripheral wall part 72 has the upper end part 72U (connection part with the lid part 74) as a fulcrum. A moment (hereinafter referred to as “inner moment”) M ₁ that tilts the peripheral wall portion 72 of the main body inward in the radial direction acts. On the other hand, when the stepped portion 90C is elastically deformed as described above, the main body peripheral wall portion 72 has a moment (hereinafter referred to as “winding portion 80”) that tilts the main body peripheral wall portion 72 radially outward with the upper end 72U as a fulcrum. M ₂ ) (referred to as “outer moment”). Since the inner moment M ₁ is canceled by the outer moment M ₂ , the deformation of the main body peripheral wall portion 72 in the radial direction is further suppressed.

  Furthermore, by projecting the inner overhanging portion 90B radially outward from the lower end portion 72L of the main body peripheral wall portion 72, the inner overhang portion 90B moves upward (from the lid 74 side) from the lower end portion 72L of the main body peripheral wall portion 72. Compared with a configuration projecting radially outward from the shifted position, the axial height L of the body peripheral wall portion 72 of the stepped portion 90C can be increased while reducing the thickness of the entire reel 10 in the axial direction. . As a result, the stepped portion 90C is easily elastically deformed toward the main body peripheral wall portion 72 with the connection portion 90D with the inner overhanging portion 90B as a fulcrum, so that deformation of the main body peripheral wall portion 72 toward the inner side in the radial direction is further suppressed.

  In particular, the connecting portion 90D between the stepped portion 90C and the inner overhanging portion 90B is located below the lower end surface 80L of the winding portion 80. Therefore, the height L in the axial direction of the stepped portion 90C is higher than the configuration in which the connecting portion 90D between the stepped portion 90C and the inner projecting portion 90B is positioned above the lower end surface 80L of the winding portion 80. ing. Thereby, when the outer peripheral surface 80A of the winding portion 80 is pressed toward the main body peripheral wall portion 72 by the winding pressure F of the recording tape T, the moment acting on the step portion 90C is increased, so that the step portion 90C is It becomes easier to elastically deform toward the portion 72 side.

  Moreover, the stepped portion 90 </ b> C extends in an annular shape along the outer peripheral surface 72 </ b> A of the main body peripheral wall portion 72 of the hub main body portion 70. Therefore, when the outer peripheral surface 80A of the winding portion 80 is pressed toward the main body peripheral wall portion 72 by the winding pressure F of the recording tape T, the stepped portion 90C is uniformly distributed over the entire circumference of the main body peripheral wall portion 72. Transforms into Therefore, deformation of the main body peripheral wall portion 72 inward in the radial direction is suppressed over the entire circumference of the main body peripheral wall portion 72.

  Further, since the upper flange 14 and the lower flange 16 have the same shape (vertical symmetry), only one mold for manufacturing the upper flange 14 and the lower flange 16 is sufficient. Therefore, the shape of the upper flange 14 and the lower flange 16 is different, and the manufacturing cost of the reel 10 can be reduced as compared with a configuration in which a mold for the upper flange 14 and a mold for the lower flange 16 are separately required. it can.

  In the first embodiment, the example in which the inner projecting portion 90B of the coupling portion 90 projects outward in the radial direction from the lower end portion 72L of the main body peripheral wall portion 72 of the hub main body portion 70 is shown, but the present invention is not limited thereto. The inner projecting portion 90B of the connecting portion 90 may be disposed at a position shifted in the vertical direction (axial direction) with respect to the outer projecting portion 90A of the connecting portion 90. For example, the outer peripheral surface of the main body peripheral wall portion 72 The outer projecting portion 90 </ b> A in 72 </ b> A and the lower end portion 72 </ b> L of the main body peripheral wall portion 72 may project outward in the radial direction.

  Next, a second embodiment will be described. Note that the same components as those in the first embodiment are denoted by the same reference numerals and will be appropriately omitted.

  In the first embodiment, the example in which the inner projecting portion 90B of the coupling portion 90 projects outward in the radial direction from the lower end portion 72L of the main body peripheral wall portion 72 of the hub main body portion 70 is shown, but the present invention is not limited thereto. For example, as shown in FIG. 6, the stepped portion 90C of the connecting portion 90 extends upward from the inner peripheral portion of the outer overhanging portion 90A, and the inner overhanging portion 90B moves upward ( You may position to the other side of an axial direction). Specifically, the inner projecting portion 90B projects radially outward from the upper end side of the main body peripheral wall portion 72, and the outer peripheral portion thereof is connected to the upper end portion of the stepped portion 90C.

  Thereby, when the outer peripheral surface 80A of the winding portion 80 is pressed toward the main body peripheral wall portion 72 by the winding pressure F of the recording tape T, the lower end portion of the stepped portion 90C is connected to the main body peripheral wall portion via the outer projecting portion 90A. 72 side. When the pressing force pressing the lower end portion of the step portion 90C toward the main body peripheral wall portion 72 side becomes a predetermined value or more, the step portion 90C moves toward the main body peripheral wall portion 72 side using the connection portion 90D with the inner overhang portion 90B as a fulcrum. It is elastically deformed so as to tilt, and the winding part 80 is displaced toward the main body peripheral wall part 72 side. Therefore, the same operation and effect as the first embodiment can be obtained.

  Further, by positioning the inner overhanging portion 90B on the lid 74 side of the hub main body portion 70 with respect to the outer overhanging portion 90A, the configuration on the lower end portion 72L side of the main body peripheral wall portion 72 is simplified. Therefore, the reel 10 can be easily stored in the housing 52 of the drive device 50.

  Next, a third embodiment will be described. The same components as those in the first and second embodiments are denoted by the same reference numerals and will be appropriately omitted.

  In the first and second embodiments, the example in which the stepped portion 90 </ b> C is formed in the connecting portion 90 that connects the hub main body portion 70 and the winding portion 80 is shown, but the present invention is not limited thereto. For example, as in the third embodiment shown in FIG. 7, the recess 100 may be formed in the connecting portion 90 instead of the stepped portion 90 </ b> C.

  Specifically, the inner overhang portion 90B projects outward in the radial direction from the axial central portion of the main body peripheral wall portion 72 of the hub main body portion 70, and is positioned on the radially inner side of the outer overhang portion 90A. The inner projecting portion 90B and the outer projecting portion 90A are connected by a recess 100. The concave portion 100 has a concave shape toward the opening 76 side of the hub main body portion 70 (main body peripheral wall portion 72) with respect to the inner overhang portion 90B and the outer overhang portion 90A, and is opposed to the radial direction of the winding portion 80. A pair of outer peripheral wall portions 100A and inner peripheral wall portions 100B, and a bottom portion 100C that connects lower end portions of these outer peripheral wall portions 100A and inner peripheral wall portions 100B.

  Here, when the outer peripheral surface 80A of the winding portion 80 is pressed toward the main body peripheral wall portion 72 by the winding pressure F of the recording tape T, the outer peripheral wall portion 100A of the concave portion 100 via the outer overhanging portion 90A of the connecting portion 90. Is pushed toward the inner peripheral wall portion 100B. When the pressing force pressing the upper end portion of the outer peripheral wall portion 100A toward the inner peripheral wall portion 100B becomes equal to or greater than a predetermined value, the outer peripheral wall portion 100A supports the connecting portion 100D with the bottom portion 100C as indicated by a two-dot chain line. As a result, the winding part 80 is displaced toward the main body peripheral wall part 72 side. Therefore, the same operation and effect as the first embodiment can be obtained.

  In addition, although the recessed part 100 showed the concave shape toward the opening 76 side of the hub main-body part 70 with respect to the inner side overhang | projection part 90B and the outer side overhang | projection part 90A, it was not restricted to this. For example, a concave portion may be formed in the inner projecting portion 90B and the outer projecting portion 90A so as to form a concave shape toward the lid portion 74 side of the hub main body portion 70.

  Moreover, although the example which located the inner side overhang | projection part 90B in the radial direction inner side of the outer side overhang | projection part 90A was shown, the inner side overhang | projection part 90B shifted | deviated to the up-down direction (axial direction) with respect to the outer overhang | projection part 90A. You may arrange in a position.

  The step portion 90C in the first and second embodiments is disposed between the winding portion 80 and the main body peripheral wall portion 72 with the axial direction of the main body peripheral wall portion 72 as the longitudinal direction, and an upper end portion (one end in the longitudinal direction). Side) is connected to the winding portion 80 via the outer overhanging portion 90A, and the lower end portion (the other end in the longitudinal direction) is connected to the main body peripheral wall portion 72 via the inner overhanging portion 90B. Corresponds to the shape.

  Moreover, in the said 1st-3rd embodiment, although the example which protruded 90 A of outer side protrusion parts of the connection part 90 from the axial direction center part of the winding part 80 was shown to the radial inside, it is not restricted to this. The outer projecting portion 90 </ b> A may project radially inward from a portion shifted in the vertical direction (axial direction) from the axial central portion of the winding unit 80.

  Moreover, in the said 1st-3rd embodiment, although the radial direction positioning hole 40 and the axial direction positioning surface 78A as a positioning part were formed in the boss | hub part 78 of the cover part 74 of the hub main-body part 70, the example shown was shown. Not limited to this. The positions and shapes of the radial positioning hole 40 and the axial positioning surface 78A can be changed as appropriate. Further, at least one of the radial positioning hole 40 and the axial positioning surface 78A may be formed in the lid 74.

  Moreover, although the example which accommodates the motor 18 in the accommodating part S formed in the hub main-body part 70 was shown in the said 1st-3rd embodiment, it is not restricted to this. The accommodating portion S can accommodate rotational driving parts for rotating the reel 10 and various wirings.

  Moreover, in the said 1st-3rd embodiment, although the upper flange 14 and the lower flange 16 as a pair of flange part showed the example welded to the upper surface and lower surface of 90 A of outer side extension parts of the connection part 90, to this, Not exclusively. For example, a through hole of the outer projecting portion 90A of the connecting portion 90 may be formed, and a part of the upper flange 14 and the lower flange 16 may be directly coupled through the through hole.

  Specifically, as in the fourth embodiment shown in FIG. 8, the through hole 30 is formed in the outer projecting portion 90A of the connecting portion 90A. On the other hand, on the lower surface of the overhanging portion 33 of the upper flange 14 and the upper surface of the overhanging portion 35 of the lower flange 16, protrusions 46 and 48 as insertion portions inserted into the through holes 30 are formed, respectively. These protrusions 46 and 48 are inserted into the through-holes 30 from opposite directions, and screw bosses 66 formed in the protrusions 48 are fitted into fitting holes 64 formed in the protrusions 46. Further, a screw hole 49 communicating with the fitting hole 64 is formed in the overhang portion 33. By tightening the screw 62 into the screw boss portion 66 through the screw hole 49, the protruding portion 33 of the upper flange 14 and the protruding portion 35 of the lower flange 16 are directly coupled.

  Thus, the reel hub is formed by directly connecting the projecting portion 33 of the upper flange 14 and the projecting portion 35 of the lower flange 16 through the through hole 30 formed in the outer projecting portion 90A of the connecting portion 90. 12, the upper flange 14 and the lower flange 16 can be attached so as not to rotate relative to each other. Accordingly, it is not necessary to separately form a detent means for making the upper flange 14 and the lower flange 16 non-rotatable relative to the reel hub 12 in the reel hub 12, the upper flange 14, the lower flange 16, and the like. Accordingly, the structure of the mold for forming the reel hub 12, the upper flange 14, and the lower flange 16 can be simplified as compared with the configuration in which the rotation preventing means is formed on the reel hub 12, the upper flange 14, the lower flange 16, and the like. Can do. Therefore, the manufacturing cost of molds and the like can be reduced.

  In the configuration shown in FIG. 8, the example in which the overhanging portion 33 of the upper flange 14 and the overhanging portion 35 of the lower flange 16 are coupled with the screws 62 is shown, but the present invention is not limited to this. For example, the overhang portion 33 of the upper flange 14 and the overhang portion 35 of the lower flange 16 may be welded using ED or the like.

  Further, in the first to third embodiments, the example in which the reel 10 is arranged with the rotation axis direction as the vertical direction is shown, but the present invention is not limited thereto. For example, the reel 10 may be arranged with the rotation axis direction as the horizontal direction.

  Furthermore, although not shown, the reels 10 and 20 according to the above embodiment can be applied to a recording tape cartridge in which only one reel is accommodated in the housing 52.

  Next, the result of reel deformation simulation will be described.

  Using the reels according to Examples 1 to 6 and the reel according to the comparative example, a deformation simulation of each reel was performed.

  FIG. 9A shows a basic model of the analysis model according to the first to fifth embodiments, and FIG. 9B shows an analysis model according to the sixth embodiment. Examples 1 to 5 are analysis models corresponding to the reel 10 shown in FIG. 5, and Example 6 is an analysis model corresponding to a first modification of the reel 10 shown in FIG. 6. In each of Examples 1 to 5, as shown in Table 1 below, the height L (see FIG. 5) of the stepped portion 90C is different. In Table 1, the height L of the stepped portion 90 </ b> C is expressed with the lower side being positive with respect to the central portion in the axial direction of the winding portion 80.

  On the other hand, FIG. 10 shows an analysis model according to a comparative example. In this comparative example, the stepped portion is not formed in the connecting portion 90, and the lower end portion 72 </ b> L of the main body peripheral wall portion 72 of the hub main body portion 70 and the axially central portion of the winding portion 80 are formed by the flat connecting portion 110. Are connected.

  For each analysis model according to the first to sixth embodiments and the comparative example described above, a uniform distributed load simulating the winding pressure F of the recording tape is applied to the outer peripheral surface 80A of the winding portion 80. The amount of deformation dy (a) in the vertical direction (axial direction) of the outer peripheral edge 74A of the lid part 74 in each analysis model, and the vertical direction (axis) of the inner peripheral edge in the upper end surface 80U of the winding part 80 in each analysis model Direction) deformation dy (b) was obtained by analysis. In each analysis model according to the first to sixth embodiments, the support condition for the axial positioning surface 78A is fixed.

  Table 1 below and FIG. 11 show the analysis results. The deformation amount dy (a) of the outer peripheral edge 74A of the lid portion 74 and the deformation amount dy (b) of the upper end surface 80U of the winding portion 80 are the outer peripheral edge 74A of the lid portion 74 and the upper end surface 80U of the winding portion 80. The position of the inner peripheral edge before deformation is expressed as a reference with the lower part being positive and the upper part being negative.

  As can be seen from Table 1 and FIG. 11, in each analysis model according to Examples 1 to 6, the absolute value of the deformation amount dy (a) of the outer peripheral edge 74 </ b> A of the lid 74 compared to the analysis model according to the comparative example. Are all small. This is because in each analysis model according to Examples 1 to 6, the winding pressure F of the recording tape T transmitted to the lid part 74 of the hub main body part 70 is reduced by the elastic deformation of the step part 90C. it is conceivable that.

  Furthermore, in each analysis model according to the first to sixth embodiments, the absolute value of the deformation amount dy (b) of the upper end surface 80U of the winding portion 80 is smaller than that of the analysis model according to the comparative example. I understand that. This is because, in each analysis model according to the first to sixth embodiments, the stepped portion 90C is elastically deformed and the winding portion 80 is displaced toward the hub main body portion 70, so that the upper end surface 80U side of the winding portion 80 is obtained. This is thought to be due to the absorption of the bending deformation. By suppressing the deformation on the upper end surface 80U side of the winding portion 80 in this manner, the deformation of the upper flange 14 is suppressed, and as a result, the winding deviation of the recording tape T accompanying the deformation of the upper flange 14 is also suppressed. Although the analysis is omitted, the deformation of the lower end surface 80L of the winding unit 80 is also reduced in the same manner as the upper end surface 80U of the winding unit 80.

  As can be seen from the analysis results of the analysis models according to Examples 1 to 5, as the height L of the stepped portion 90C increases, the deformation amount dy (a) of the outer peripheral edge 74A of the lid portion 74 and the winding amount are increased. The absolute value of the deformation amount dy (b) of the upper end surface 80U of the portion 80 is small. Therefore, by suppressing the height L of the stepped portion 90C, the effect of suppressing the deformation of the lid portion 74 and the winding portion 80 of the hub main body portion 70 can be improved.

  The first to third embodiments of the present invention have been described above. However, the present invention is not limited to such embodiments, and the first to third embodiments and various modifications may be used in appropriate combination. It goes without saying that the present invention can be carried out in various modes without departing from the gist of the present invention.

10 reel 18 motor 40 radial positioning hole (positioning part)
52 Housing 70 Hub main body 72 Main body peripheral wall 72A Outer peripheral surface 72L Lower end (opening side end)
74 Lid 76 Opening 78A Axial Positioning Surface (Positioning Unit)
80 winding part 80A outer peripheral surface 80B inner peripheral surface 90 connecting part 90A outer overhang part 90B inner overhang part 90C step part (deformation absorption part, wall-like part)
100 recess (deformation absorbing part)
S receiving part T recording tape

Claims (7)

A hub main body having a cylindrical peripheral wall and a lid provided on one axial end of the main peripheral wall;
A winding part that is formed in a cylindrical shape and in which the main body peripheral wall part is disposed and the recording tape is wound around the outer peripheral surface;
Projecting radially inward from the inner peripheral surface of the winding part, a connecting part for connecting the winding part and the outer peripheral surface of the main body peripheral wall part,
A deformation absorbing portion that is formed on the connecting portion and elastically deforms to displace the winding portion toward the main body peripheral wall portion; and
With
The connecting portion is
An outer projecting portion projecting radially inward from the inner peripheral surface of the winding portion;
An inner projecting portion projecting radially outward from the outer peripheral surface of the peripheral wall portion of the main body,
Have
The deformation absorbing portion is a stepped portion that positions the inner overhanging portion with respect to the outer overhanging portion on the opening side opposite to the lid portion in the main body peripheral wall portion,
reel. The inner overhanging portion projects radially outward from the opening side end of the main body peripheral wall portion,
The reel according to claim 1. A hub main body having a cylindrical peripheral wall and a lid provided on one axial end of the main peripheral wall;
A winding part that is formed in a cylindrical shape and in which the main body peripheral wall part is disposed and the recording tape is wound around the outer peripheral surface;
Projecting radially inward from the inner peripheral surface of the winding part, a connecting part for connecting the winding part and the outer peripheral surface of the main body peripheral wall part,
A deformation absorbing portion that is formed on the connecting portion and elastically deforms to displace the winding portion toward the main body peripheral wall portion; and
With
The connecting portion is
An outer projecting portion projecting radially inward from the inner peripheral surface of the winding portion;
An inner projecting portion that is disposed on the opening side of the main body peripheral wall portion opposite to the lid portion from the outer projecting portion, and projects radially outward from the outer peripheral surface of the main body peripheral wall portion;
Have
The deformation absorbing portion is disposed between the winding portion and the main body peripheral wall portion with the axial direction of the main body peripheral wall portion as a longitudinal direction, and one end side in the longitudinal direction is connected to the winding portion via the outer projecting portion. A wall-like portion that is connected and the other end in the longitudinal direction is connected to the peripheral wall portion of the main body via the inner overhanging portion,
reel. The outer projecting portion projects radially inward from the axial center of the winding portion,
The reel according to any one of claims 1 to 3. The deformation absorbing portion extends annularly along the outer peripheral surface of the main body peripheral wall portion,
The reel according to any one of claims 1 to 4. The lid portion is formed with a positioning portion for positioning the hub body portion with respect to a housing in which the hub body portion is housed.
The reel according to any one of claims 1 to 5. A housing portion that houses a motor that rotationally drives the hub body portion is formed inside the body peripheral wall portion.
The reel according to any one of claims 1 to 6.

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