JPH01205777A - Tape reel - Google Patents

Abstract

PURPOSE:To ensure the holding force of a tape without putting its end out on the outside surface by fitting a lock piece in a desired shape equipped with a tape stopping part into the opening of a reel hub provided with a projecting part, etc. CONSTITUTION:A tape lock part 13 is provided for the tip of a rib 12 of a lock piece 11 and the direction of the major axis of the lock part is at an acute angle theta with a segment to link the center of a main body 11b with the center of the reel hub. When the lock piece is fitted into an opening 22 provided with a projecting part 17 of the reel hub and a projecting part 24 of a central part, a leader tape 25 at the end of the tape is held between the stopping part 13, the projecting part 24, etc. In this state, when tension is applied to the tape in the direction of an arrow 26, one end 13a of the lock part 13 to engage with the projecting part 17 and the other end 13b on the opposite side press the tape 25 on an side surface 24e of the projecting part 24 at the angle theta, they act as wedge and their pressure increases in proportion to the tape tension. Thus, the holding force for the leader tape is sufficiently ensured without putting the end of the leader tape out on the outside surface and unevenness is not generated on the tape wound on a reel.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tape reel used in a tape cassette, etc., which is most suitable for application to recording and reproducing devices such as video tape recorders and various information processing devices. It is.

2. Description of the Related Art Conventionally, a tape locking mechanism for a tape reel in a tape cassette of this type has a structure as shown in FIG. 9, for example. In FIG. 9, reference numeral 1 indicates a locking piece main body having a curvature similar to that of the reel hub and an outer peripheral portion of uniform thickness, and reference numeral 2 indicates a reinforcing rib provided integrally with this main body. is provided with a space 3 in the main body 1. Further, reference numerals 4 and 5 are locking parts protruding from both sides of the main body 1, and the locking part 4 is longer than the locking part 6. FIG. 10 shows a state in which a conventional locking piece is locked to the reel hub 6. The locking piece fits into the recess 8 of the reel hub 6 via the leader tape 7 to fix the leader tape 7. When inserting, the locking piece enters from the locking part 4 first, and the locking part 5 is inserted later. It has a structure that allows you to squeeze in. Since the locking portion 4 is long, the locking piece is difficult to come off from the reel hub 6 even if the leader tape is pulled in the direction of the arrow 9.

Problems to be Solved by the Invention However, the problems that arise with the above-mentioned conventional tape reel structure are as follows. When locking the leader tape 7 in FIG. 10, if the end part a of the leader tape 7 is pulled out to a position on the outer periphery of the reel hub 6 and held between the locking pieces, the end part a is positioned opposite to the end part 7a. A step 7C corresponding to the thickness of the leader tape occurs at 1o. This step 7
C does not disappear even when a long leader tape is wound around the reel hub, and when a magnetic tape (not shown) that is relatively thinner than the leader tape is wound, the period C does not change at the 1o position. set-off occurs, deterioration of electromagnetic conversion characteristics (D, 0
This results in negative effects such as poor audio quality, poor audio quality, and poor tape appearance (disordered winding). In order to avoid this, if the end of the leader tape is not pulled out to the outer periphery of the reel hub 6 but held at position 7b, when the leader tape is pulled in the direction of 9, the pressure on the end of the leader tape will not be effective. It had the important point that it could easily come off.

Further, the same can be said when using left-right symmetrical locking pieces with different shapes as shown in FIG. 11.

From the viewpoint of the level difference in the leader tape, which is the main cause of the level difference, the present invention provides a tape reel that does not allow the end of the leader tape to protrude above the outer circumferential surface of the reel hub and can ensure sufficient clamping force for the leader tape. This is what we provide.

Means for Solving the Problems The tape reel of the present invention has an inner peripheral part and an outer peripheral part that are in a concentric relationship, and a recess is formed in a part of the outer peripheral part between the inner peripheral part and the inner peripheral part. A reel hub having an opening, a protrusion projecting from both ends of the opening into the recess, and a protrusion at the center of the recess, and an outer peripheral part having the same curvature as the outer peripheral part of the reel hub. A pair of ribs protrudes from the inner surface of the main body, and the center and upper part of the main body have a pair of ribs extending from the inner surface of the body.
a locking piece having a long axis at an acute angle with respect to a line connecting the centers of the loops, each of which has an elongated tape stopper at the tip of the pair of ribs; A leader extending to an end of the magnetic tape, with one end of the tape stopper being engaged with the protruding part of the reel hub when the main body is attached to the opening of the reel hub, and the other end being brought into contact with a side surface of the convex part. The tape is characterized in that the end portion of the tape is sandwiched and fixed between the convex portion and the protruding portion by at least one of the tape stop portions at the tips of the pair of ribs.

Further, a flat part is provided between a pair of ribs protruding from the inner surface of the main body of the locking piece, and when the locking piece is attached to the recess of the reel hub, the flat part of the locking piece is inserted into the recess of the reel hub. The reel is characterized in that the tip surface of the convex portion provided substantially apart from the inner periphery of the reel hub comes into contact with the reel hub.

Function The tape reel of the present invention has a pair of ribs on the locking piece,
The tape stops provided at the tips of these pair of ribs are not in an acute angle relationship with the convexity provided in the recess of the reel hub, and one end of the upper part of the tape is connected from the opening constituting the concave part to the concave part. It engages with the protrusion that protrudes inward, and the other end abuts the side surface of the convex part, so when a radial force is applied to the leader tape fixed to the reel hub by the locking piece, the tip of the rib The tape stop at the tip of the rib is operated so that the leader tape is strongly held between the other end and the side surface of the convex part, and when a force in the winding direction is applied to the leader tape, the tape stop at the tip of the rib will close at one end. is operated so as to firmly sandwich the leader tape between the protrusion and the protrusion. Therefore, sufficient clamping force can be ensured without pulling out the end of the leader tape to the outer periphery of the reel nop.

In addition, the convex part where the flat part provided on the inner surface of the locking piece body comes into contact with the tip surface is formed to be substantially separated from the inner peripheral part of the reel hub, so that excessive elastic force due to heat contraction etc. It is possible to realize a tape reel that does not impose a load on the peripheral portion and is less deformed.

EXAMPLE An example of the present invention will be described below with reference to the drawings. FIG. 1 is an example of a tape locking piece 11 used in a tape reel according to an embodiment of the present invention. In Figure 1,
11 is a locking piece, and 11b is a main body having an outer periphery of curvature similar to that of the reel hub.

11a is a flat portion provided on the inner surface of the main body 111L.

The reel hub faces and abuts against a protrusion within a recess provided in the reel hub. Reference numeral 14 indicates uniformly thick parts extending from both ends of the main body 11b, and 12 indicates ribs protruding from the inner surface of the main body 11b, which are located on both sides of the flat part 111L. Reference numeral 13 denotes a tape stopper projected from the tip of the rib 12, and has an elongated shape with its long axis in the direction of an acute angle θ with respect to a line connecting the center of the main body 11b and the center of the reel hub. 16
is a notch, which is provided between a pair of ribs 12.

In FIGS. 2 and 3, the locking piece 1 is inserted through the leader tape 25.
1 is a diagram showing a state in which the reel knob 1 is locked to the reel knob 1.

22 is an opening provided in the outer peripheral part 16 of the reel nop;
A recess 23 is formed between the reel hub and the inner circumference 2o of the reel hub. Reference numeral 24 denotes a convex portion provided within the concave portion of the reel nop, and is provided upright from the flange portion of the reel hub (not shown). 19 is a radial rib connecting the outer peripheral part 16 and the inner peripheral part 2o, 17 is a protrusion projecting from the rib 19 into the recess 23, and is located at both ends of the opening 220. 25 is a leader tape. The end portion 251L of the leader tape 26 locked in this manner does not protrude above the outer peripheral portion 16 of the reel hub, so there is no difference in level due to the thickness of the leader tape, and no set-off phenomenon that adversely affects electromagnetic conversion characteristics occurs. .

Here, the locking piece 11 is connected to an opening 22 on the inner circumference of the reel hub.
Then, the tape stop portions 13 at the tips of the pair of ribs 12 are inserted into the recess 23 together with the leader tape 25. This results in
One end 13a of the tape stopper 13 is locked to the end 18 of the protrusion 17 to sandwich the leader tape 26 between it and the end 1B, and the other end 13b is attached to the side surface 24 of the protrusion 24.
6 to sandwich the leader tape 25 between the side surface 24θ and the side surface 24θ. The convex portion 24 is formed into a U-shaped cross section by a cutout portion 2jLL provided on the opening 22 side.
The two tip surfaces 24b, 240 are brought into contact with the flat portion 11a of the locking piece 11, and the leader tape 26 is held between the tip surfaces 24b, 240 of each of the recesses 24 and the flat portion 112L. The other end 13b of the other tape stopper 13 contacts the side surface 246 of the convex portion 24, and the leader tape 26 is only held between the side surface 246 and the side surface 246.

In Fig. 2, the leader tape 2 is locked as described above.
6 is pulled in the radial direction of the arrow 26, the tape stop 1
3 and the end surface 18 of the protrusion 17.
A force is applied in the direction, and this force causes the other end 13b of the tape stop 13 to move against the side surface 24+5 of the protrusion 24 provided in the recess of the reel hub, and the angle θ formed between 13b and 2415
The leader tape 25 is pressed at an angle of , and the leader tape 25 is fixed by acting as a wedge and increasing the pressing force in proportion to the tension F in the 26 directions.

Further, FIG. 3a is a diagram in which the leader tape latched as described above is pulled in the tangential direction of the arrow 28. At this time, one end 131L of the tape stopper 13 attempts to move in the direction of the arrow 29, and the leader tape 25 is separated from the end surface 18 of the protrusion 17 and 1
3a, and fix it by acting as a wedge in the same way as described above. Further, due to the elastic force applied to the outer circumference of the locking piece main body 11b, a force acts in the direction of arrow 30, and the leader tape 2
5 is clamped and fixed between the tip surfaces 24b, 240 of the convex portion 24 and the flat portion 11a of the locking piece. In this way, the locking piece 11
A self-locking action occurs in proportion to the tensile force in the vicinity of the notch 15 provided in the holder, and the leader tape 25 is held extremely firmly, so that the leader tape 25 does not come out.

Note that the inner surface of the main body of the locking piece 110 is made flat, and the leader tape 26 is clamped by bringing the tip surfaces 24b and 240 of the convex portion 24 into contact with this flat part, but this is necessary to increase the clamping force. This can be done by

In order to increase the clamping force of the leader tape 25, it is necessary to provide a recess 3 on the side surface 24θ of the convex portion 24 as shown in FIG.
6, and the other end 13b of the tape stop 13 is provided in this recess 36.
By engaging, the leader tape 26 may be sandwiched across the surface.

FIGS. 4 and 5 show an example of a tape locking piece according to another embodiment of the present invention, in which the shape of the tape locking portion 13 is variously changed. Side surface 2 of the protrusion 24 provided in the recess of the reel hub
419, change the shape 1 position of the tape stop part appropriately,
By changing the angle θ formed by the tape stoppers 32 and 33 within an acute angle, the clamping strength of the leader tape 26 can be freely set.

Furthermore, Figures 6 to 8 show examples in which the shape of the convex part of the concave part of the reel hub is changed in various ways, and the extreme elastic force applied to the tape locking piece due to heat shrinkage etc. can be reduced by reducing the wall thickness near the reel fitting hole. Circumference part 20
The shape of the ribs, etc. was changed to prevent the transmission of light as much as possible. In FIG. 6, the convex portion 24 has a U-shaped cross section with a notch 35, and in FIG. 7, the convex portion 24 has an H-shaped cross section. 24d
width is small. In FIG. 8, the convex portion 24 has an H-shaped cross section with a notch 36. As shown in FIG.

Effects of the Invention According to the tape reel of the present invention, since the tape retaining portion of the tape retaining piece has an elongated shape with its long axis oriented at an acute angle with respect to the convex portion within the concave portion of the reel hub, the end of the leader tape It is possible to clamp the leader tape within the concave portion of the reel hub without exposing it to the outer periphery of the reel hub, and to fix the leader tape with a self-locking clamping force that increases in proportion to the tensile force. At the same time, since the end of the leader tape does not extend above the outer periphery of the reel hub, an extremely high-performance tape reel is realized that prevents deterioration of electromagnetic conversion characteristics (set-off phenomenon) due to the difference in thickness of the leader tape. Also,
The convex part provided within the concave part of the reel nop is shaped away from the inner periphery of the reel hub, so that excessive elastic force due to hot acid, shrinkage, etc. does not apply as much load to the reel hub periphery as possible. , has the advantage of less reel deformation, etc.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the locking piece used in the tape reel of the present invention, FIGS. 2 and 3 a are plan views showing the tape reel in a tape locking state, and FIG. is a plan view showing an embodiment of the tape reel pond of the present invention in a tape-locked state, FIGS. 4 to 8 are plan views showing an embodiment of the tape reel pond of the present invention, and FIG. The perspective view of the locking piece used in the tape reel, FIG. 10, and FIG. 11 are the same (plan views showing the tape locking state of the conventional tape reel). 11... Locking piece, 11b... Main body, 1
1a... Flat part, 12... Rib, 13
...Tape stop, 16... Reel hub outer periphery, 22... Opening, 23... Concave portion, 24... Convex portion, 17 ...Protrusion, 3
6... Concavity. Name of agent: Patent attorney Toshio Nakao and one other person
°He @1 To °tX+ @11 $) 1t
毫★Keiko@Mu@Wata゛ζJosei F1 Misawa Nawatebaryusuhiki) No. 3
figure . Figure 4 Figure 5! 1 Figure 6 Figure 7 Figure 8 Figure 9

Claims (5)

[Claims] (1) It has an inner periphery and an outer periphery that are in a concentric relationship, and an opening is provided in a part of the outer periphery so as to form a recess between the inner periphery and both ends of the opening are connected to the recess. A reel hub having a protrusion projecting inward and a convex portion provided at the center of the recess, and a pair of ribs protruding from the inner surface of the main body having an outer circumference having the same curvature as the outer circumference of the reel hub. a locking piece having a long axis at an acute angle to a line connecting the center of the main body and the center of the reel hub, and provided with a long tape stopper at the tip of each of the pair of ribs; and when the main body of the locking piece is attached to the opening of the reel hub, one end of the tape stop is locked to the protrusion of the reel hub, and the other end is brought into contact with the side surface of the convex part, and the magnetic The end of the leader tape extending from the end of the tape is sandwiched and fixed between the convex portion and the protruding portion of at least one of the tape stop portions at the tips of the pair of ribs. Features a tape reel. (2) A flat part is provided between a pair of ribs protruding from the inner surface of the main body of the locking piece, and when the locking piece is attached to the reel hub, the flat part of the locking piece is inserted into the reel hub in the reel hub. 2. The tape reel according to claim 1, wherein the tape reel is configured such that the distal end surface of the convex portion protruding substantially apart from the peripheral portion is brought into contact with the distal end surface. (3) The convex part of the reel hub is formed in a U-shaped cross section or a V-shaped cross section so that the cutout faces the opening side of the outer periphery of the reel hub, and stands upright independently only from the flange part of the reel hub. The tape reel according to claim 2, characterized in that: (4) The convex part of the reel hub has a substantially H-shaped cross section that stands upright from the flange part of the reel hub and is connected to the inner peripheral part of the reel hub, and has a width that is smaller than the width of the rib that contacts the flat part of the locking piece. 3. The tape reel according to claim 2, wherein the width of the rib connected to the peripheral portion is reduced. (5) The tape according to claim 1 or claim 2, characterized in that a recess is provided on the side surface of the convex portion, into which the other end of the tape stop at the tip of the pair of ribs provided on the locking piece engages. reel.