JP2773960B2 - Reel stand - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel base used for a magnetic recording / reproducing apparatus such as a video tape recorder.

2. Description of the Related Art In recent years, various types of magnetic recording / reproducing devices have been developed, and high performance and multifunctionality have been achieved. Further improvement in operability such as search and high-speed search is particularly required. Therefore, in order to prevent excessive tension from being applied to the tape during the transitional period of tape running, good responsiveness,
It is required to perform high-accuracy tension servo, and a mechanism that enables a more responsive tension servo is also required for a reel base that rotates and drives a tape reel.

Hereinafter, a conventional reel base will be described. FIG. 4 is a side view of a conventional reel base, FIG. 5 is a front view of a tape reel mounted on the reel base, and FIG. 6 is a longitudinal sectional view showing a mounted state of the tape reel on the reel base.

In FIG. 4, reference numeral 1 denotes a reel base body. Reference numeral 2 denotes a central shaft portion, which is formed vertically and integrally with the center of the reel base body 1. Reference numeral 3 denotes a reel hook which is fitted to the center shaft 2 and is slidable up and down along the center shaft 2. A spring 4 urges the reel hook 3 upward along the central shaft portion 2. Reference numeral 5 denotes a plurality (three in this example) of driving claws, which are arranged at equal intervals on the same plane on the outer periphery of the reel hook 3 and are provided integrally with the reel hook 3. Reference numeral 6 denotes an upper end of the plurality of driving claws 5, which is tapered upward in a tapered shape. Reference numeral 7 denotes a reel cap, which fits into the central shaft 2 at the upper portion of the reel base body 1 and regulates a range in which the reel hook 3 slidable up and down along the central shaft 2 can be raised. ing. Reference numeral 8 denotes a high friction portion made of rubber or the like, which is provided on the upper surface of the reel base body 1. The reel base body 1 is driven to rotate by a reel motor (not shown).

In FIG. 5, reference numeral 9 denotes a tape reel in a tape cassette (not shown). Reference numeral 10 denotes a center hole of the tape reel 9. Reference numeral 11 denotes a plurality (9 in this example) of reel grooves,
The tape reel 9 is formed at equal intervals around the center hole 10. Reference numeral 12 denotes a plurality (nine in this example) of driven claws, which form a plurality of reel grooves 11. The number of the plurality of reel grooves 11 is an integral multiple of the number of the plurality of drive claws 5 of the reel base body 1. Reference numeral 13 denotes an annular convex portion, which is provided on the lower surface of the tape reel 9 and contacts the high friction portion 8 on the upper surface of the reel base body 1.

The operation of the conventional reel base thus configured will be described below. When the tape cassette is mounted on the reel base body 1, the center hole 10 of the tape reel 9 in the tape cassette fits into the reel cap 7 of the reel base body 1.
And the plurality of driving claws 5 of the reel hook 3 provided so as to be slidable up and down along the center shaft portion 2 mesh with the plurality of reel grooves 11 of the center hole portion 10. At this time, since the plurality of drive claws 5 need to mesh well with the plurality of reel grooves 11, the upper ends 6 of the plurality of drive claws 5 of the reel base body 1 are
When the tape cassette is mounted on the reel base body 1, the plurality of driven claws 12 of the tape reel 9 are tapered to the upper surface 6 of the plurality of driving claws 5. When the tape reel 9 comes into contact, the tape reel 9 rotates by a minute angle by receiving a force in the rotating direction from the inclined surface of the tapered portion of the upper end 6 of the plurality of driving claws 5, and as a result, is urged upward by the spring 4. The plurality of driving claws 5 are engaged with the plurality of reel grooves 11, and the annular convex portion 13 on the lower surface of the tape reel 9 is pressed against the high friction portion 8 on the upper surface of the reel base body 1, so that the tape cassette is mounted on the reel base body 1. Installation is completed. When the reel base body 1 is rotated by the reel motor, the plurality of driving claws 5 in the plurality of reel grooves 11 are locked on the wall surfaces of the plurality of driven claws 12, and the torque of the reel motor is reduced. 1 to the tape reel 9. In addition, the high friction portion 8 on the upper surface of the reel base body 1 prevents the play due to the clearance of the width of the plurality of driving claws 5 with respect to the width of the plurality of reel grooves 11, and the tape reel 9 is integrated with the reel base body 1. It is provided for driving.

However, in the above-described conventional configuration, the reel base body 1
When the tape reel 9 is fitted into the central shaft portion 2 in a state where the plurality of drive claws 5 are located at any three of the nine reel grooves 11 of the tape reel 9, the plurality of The driven claws 12 do not contact the upper ends 6 of the plurality of driving claws 5, the plurality of driving claws 5 engage with the plurality of reel grooves 11, and the plurality of driven claws 12 are tapered from the plurality of driving claws 5. When the tape reel 9 comes into contact with the inclined surface of the tapered portion, as described above, the tape reel 9 receives a force in the rotational direction from the tapered portion of the tapered portion and rotates by a small angle. Although it is possible to engage with the reel groove 11, the plurality of driven claws 12 do not necessarily contact the slope of the tapered portion of the upper end 6 of the plurality of driving claws 5, and the plurality of driven claws 12 There is a case where the phases of the driving claws 5 coincide with each other and come into contact with the tip of the tapered portion. In this case, since the tape reel 9 cannot receive the above-described force in the rotational direction from the upper ends 6 of the plurality of driving claws 5, the plurality of driven claws 12 and the upper end 6 of the plurality of driving claws 5 The tip of the tapered portion remains in contact with the tape reel 9 as shown in FIG.
Of the plurality of driven claws 12 of the reel base body 1
Is pressed down to the high friction portion 8 on the upper surface of the reel base body 1 while the tape cassette is pressed down to the root of the central shaft portion 2, and the tape cassette is moved to the reel base body 1.
Was sometimes completed. In this case, since the annular projection 13 on the lower surface of the tape reel 9 is pressed against the high friction portion 8 on the upper surface of the reel base 1, the tape reel 9 is relatively moved on the reel base 1 against the frictional force. Therefore, the tape reel 9 is driven to rotate only by the frictional force of the high friction portion 8 without the plurality of driving claws 5 being engaged with the plurality of reel grooves 11. Therefore, when the reel motor is started to drive the tape reel 9 in such a state, when the rotation of the tape reel 9 is suddenly started to perform a highly responsive tape running, a high friction is generated. When a torque larger than that which can be transmitted by the unit 8 is applied to the reel base body 1, a slip occurs between the reel base body 1 and the tape reel 9, and a highly responsive and highly accurate tension of the running tape by the reel motor is provided. Servo cannot be performed, and the plurality of driving claws 5 which have been pressed down when the annular convex portion 13 on the lower surface of the tape reel 9 has slipped on the high friction portion 8 on the upper surface of the reel base body 1 have springs. 4, the plurality of drive claws 5 mesh with the plurality of reel grooves 11 of the tape reel 9 unexpectedly and unexpectedly. In addition, a collision sound is generated, and an impact is applied to the tape reel 9 to apply an impact to the running tape wound on the tape reel 9, and in some cases, the running tape is damaged. Also, the reel base body 1
Even when the high friction portion 8 is not provided on the upper surface of the tape reel 9, when the rotation of the tape reel 9 is to be started up, the plurality of driving claws 5 pressed down by the plurality of driven claws 12 form the plurality of reel grooves. There is also a problem that the upper ends 6 of the plurality of driving claws 5 keep rotating while contacting the lower ends of the plurality of driven claws 12 without being engaged with the driven claws 11.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problem. When a tape cassette is mounted on a reel base body, a plurality of driven claws of a tape reel in the tape cassette are tapered at the upper end of the plurality of driving claws. When the plurality of driving claws are kept pressed down to the root of the central shaft portion when the abutment is in contact with the reel base body, the annular projection on the lower surface of the tape reel is not pressed against the upper surface of the reel base body. A plurality of drive claws can smoothly mesh with a plurality of reel grooves of a tape reel, and a torque of a reel motor can be reliably transmitted from a reel base body to a tape reel. It is assumed that.

Means for Solving the Problems To solve this problem, a reel base of the present invention comprises a center shaft portion provided on a reel base body such that a center hole of a tape reel having a plurality of driven claws is inserted. A first claw provided slidably up and down along the central shaft portion and capable of engaging with a plurality of driven claws; and a second claw provided on the reel base body near the central shaft portion. When the plurality of driven claws push down the first claw, which is the driving claw, to the base of the central shaft portion, the plurality of driven claws come into contact with the second claw, and the tape reel moves to the reel base. The height of the second claw is set to a height such that there is a gap with the main body, and the upper end of the second claw is formed in a convex shape.

According to the present invention, when the center hole of the tape reel is fitted to the center shaft of the reel base body, the plurality of driven claws and the first claws are engaged in phase with each other. Then, when the plurality of driven claws come into contact with the upper end of the first claw and push down the first claw to the root of the central shaft portion, the second claw provided near the central shaft portion becomes the plurality of driven claws. By engaging the drive claw while guiding it, the first claw can smoothly mesh with the plurality of reel grooves of the tape reel. The mounting of the cassette on the reel base body is completed.

An embodiment of the present invention will be described below with reference to the drawings. The same components as those in the conventional example are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIGS. 1 (a), (b) and FIGS. 2 (a), (b) are a transverse sectional view and a longitudinal sectional view showing different mounting states of a tape reel on a reel base in one embodiment of the present invention. 1
FIG. 1B is a sectional view taken along the line AA 'of FIG. 1A, and FIG. 2B is a sectional view taken along the line BB' of FIG. 2A. FIGS. 3 (A) to 3 (C) and (a) to (c) are main part operation explanatory views showing the operation of mounting the tape reel on the reel base according to one embodiment of the present invention.

1 and 2, the difference from the reel base of the conventional example is that the center of the tape reel 9 is provided integrally with the reel hook 3 at equal intervals on the same plane on the outer periphery of the reel hook 3. In addition to a plurality of convex first claws (three in this embodiment) 21 that engage with the plurality of reel grooves 11 of the hole 10 and drive the plurality of driven claws 12 of the tape reel 9, the tape reel Nine second claws 23 capable of contacting the lower ends 22 of the plurality of driven claws 12 are provided at several places (six in the present embodiment) on the reel base body 1 near the root of the central shaft 2. The driven claws 12 of the tape reel 9 are
Engages with the first claw 21 and pushes it down to the root of the central shaft portion 2 so that the annular convex portion 13 on the lower surface of the tape reel 9 comes into contact with the high friction portion 25 on the upper surface 24 of the reel base body 1. So that the lowering of the tape reel 9 stops at a height at which there is a gap,
The height of the contact surface 27 between the upper end 26 of the second claw 23 and the lower end 22 of the plurality of driven claws 12 is set, and the contact surface 27 is, like the upper end 28 of the first claw 21, The point is that it is formed in a convex shape tapering upward.

Regarding the reel base of the present embodiment configured as described above,
The operation will be described below. When the tape cassette is mounted on the reel base body 1, FIGS. 1 (a) and 1 (b)
As shown in the figure, the center hole 10 of the tape reel 9 in the tape cassette is fitted into the reel cap 7 of the reel base body 1 and the reel hook 3 is slidable up and down along the center shaft 2. One claw 21 has a plurality of reel grooves 11 in the center hole 10.
Mesh with. At this time, since the second claw 23 is provided so as to be located at six positions of the plurality of reel grooves 11 except for the engagement of the first claw 21, the second claw 23 is provided with the plurality of driven claws 12. Without contacting the lower end 22 of the tape reel 9 and the annular convex portion 13 on the lower surface of the tape reel 9 is pressed against the high friction portion 25 of the upper surface 24 of the reel base body 1. When the reel base body 1 is rotated by the reel motor, the first claws 21 are completely meshed with the plurality of reel grooves 11, so that the first claws 21
12 within the range of the clearance of the width of the first claw 21 with respect to the width of the plurality of reel grooves 11, the frictional force of the high friction portion 25 causes the tape reel 9 to lock.
The first claw on the wall of the plurality of driven claws 12
The tape reel 9 is rotatably driven integrally with the reel base body 1 to prevent the violent collision of the tape reel 21 and the torque of the reel motor is increased from the reel base body 1 to the tape reel 9.
Is reliably transmitted to

Then, the first claw 21 integral with the reel hook 3 does not mesh with the plurality of reel grooves 11 of the tape reel 9, and the phases of the plurality of driven claws 12 and the first claw 21 are engaged and engaged with each other, When the lower ends 22 of the plurality of driven claws 12 abut against the tips of the tapered portions of the upper ends 28 of the first claws 21 to push down the first claws 21 to the base of the central shaft portion 2, FIG. As shown in (a) and (b), lower ends 22 of six driven claws 12 other than abutting on upper ends 28 of the first claws 21 are provided at six places on the reel base body 1. The tape reel 9 that has descended while being fitted to the central shaft 2 to abut on the upper end 26 of the second claw 23 is regulated at that position, and the tape cassette is kept biased downward. The descent stops in the state of being held. And then,
The upper end of the second claw 23 so that the lowering of the tape reel 9 stops at a height at which the annular convex portion 13 on the lower surface of the tape reel 9 has a gap with the high friction portion 25 on the upper surface 24 of the reel base body 1. 26
Is set, the plurality of driven claws 12 are
The annular convex portion 13 is not pressed against the high friction portion 25 on the upper surface 24 of the reel base body 1 while the claw 21 is pushed down to the base of the central shaft portion 2. At this time, the contact surface 27 of the upper end 26 of the second claw 23 that contacts the plurality of driven claws 12 is formed on the upper surface 24 of the reel base body 1 to which the annular protrusion 13 on the lower surface of the tape reel 9 is pressed.
Has a smaller coefficient of friction than the high friction portion 25 of
When the tape reel 9 is to be slid relatively on the reel base 1, the annular convex portion 13 on the lower surface of the tape reel 9 is not in contact with the high friction portion 25 on the upper surface 24 of the reel base 1. Since the annular convex portion 13 on the lower surface of the tape reel 9 can be slid with a very small torque as compared with the state in which the annular convex portion 13 on the upper surface 24 of the reel base body 1 is pressed against the high friction portion 25, The reel base body 1 is rotated by a small angle with a slight force, or the tape reel 9 is rotated during tape loading.
The lower end 22 of the plurality of driven claws 12 can be moved from the upper end 26 of the second claw 23 only by applying a slight tension to the traveling tape wound around the tape, and as a result, the upper end of the first claw 21
The tape reel 9 is rotated by a minute angle by receiving a force in the rotational direction from the inclined surface of the tapered portion of 28, and the first claw 21 urged upward by the spring 4 smoothly moves to the plurality of reel grooves 11. Can engage with the second claw 23
Enters the plurality of reel grooves 11 at six locations other than the engagement of the first claws 23, and in this state, the tape cassette is urged downward, and the annular projection 13 on the lower surface of the tape reel 9 is The tape cassette is pressed against the high friction portion 25 on the upper surface 24 and the mounting of the tape cassette on the reel base body 1 is completed.
The torque of the reel motor is transferred from the reel base body 1 to the tape reel 9 by the first claw 21, the high friction portion 25, and the second claw 23.
Thus, it is possible to reliably transmit.

The mounting operation of the tape reel 9 on the reel base body 1 will be described below with reference to FIG. Fig. 3 (A)-
In (C), 12 is a plurality of driven claws of the tape reel 9, 11 is a plurality of reel grooves 21 is a first claw, 22 is a lower end of the plurality of driven claws 12, and 23 is a first claw on the reel base body 1. The second claw, 26 is the upper end of the second claw 23, 27 is the second claw 23 and the plurality of driven claws 12
The upper end 28 of the first claw 21 is tapered upward in the same manner as the upper end 28 of the first claw 21. 22 and the second nail
FIG. 4 is a longitudinal sectional view of the reel base body 1 viewed from the center axis 2 direction at a contact position with an upper end 26 of the reel 23.

3 (a) to 3 (c), 9 tape reels, 13 is an annular convex portion on the lower surface of the tape reel 9, 12 is a plurality of driven claws integrated with the tape reel 9, 1 is a reel base body,
Reference numeral 24 denotes an upper surface of the reel base body 1 on which the annular convex portion 13 on the lower surface of the tape reel 9 is pressed, and reference numeral 25 denotes a high friction portion of the upper surface 24 of the reel base body 1. It is a longitudinal cross-sectional view in a center line.

Here, FIG. 3 (A) shows that the plurality of driven claws 12 of the tape reel 9 and the first claws 21 are engaged in phase, and the lower ends 22 of the plurality of driven claws 12 are the first claws. The positional relationship between the plurality of driven claws 12 and the first claw 21 in a state in which the first claw 21 is pressed down to the base of the central shaft portion 2 in contact with the tip of the tapered portion of the upper end 28 of the 21 and at that time FIG. 3A shows the positional relationship between the annular projection 13 on the lower surface of the tape reel 9 and the high friction portion 25 on the upper surface 24 of the reel base body 1 at that time. Is shown. FIG. 3 (C) shows a state in which the first claw 21 smoothly engages with the plurality of reel grooves 11 and the second claw 23 enters the plurality of reel grooves 11 other than the first claw 21 is engaged. The positional relationship between the plurality of driven claws 12 and the first claws 21 and the positional relationship between the driven claws 12 and the second claws 23 at that time are shown in FIG. 3 (C). 13
And the high friction portion 25 on the upper surface 24 of the reel base body 1. FIG. FIG. 3 (B) shows the plurality of driven claws 12 and the first claws in an intermediate state between FIGS. 3 (A) and 3 (C).
FIG. 3 (b) shows the positional relationship between the annular protrusion 13 on the lower surface of the tape reel 9 and the upper surface 24 of the reel base body 1 at that time. Friction part 25
This shows the positional relationship with.

As shown in FIGS. 3A and 3A, the plurality of driven claws 12 of the tape reel 9 and the first claws 21 are engaged in phase, and the lower ends 22 of the plurality of driven claws 12 are engaged. Is the upper end of the first claw 21
In a state in which the first claw 21 is pressed down to the base of the central shaft portion 2 by contacting the tip of the tapered portion of the second claw 28, the shape of the contact surface 27 of the upper end 26 of the second claw 23 is changed to the first claw. The second claw is formed by tapering upward like the upper end 28 of the 21.
The tip of the contact surface 27 of the contact 23 contacts the lower ends 22 of the plurality of driven claws 12 to regulate the height of the tape reel 9 with respect to the central shaft 2. At this time, the lower surface of the annular projection 13 of the tape reel 9 is set to be the height H ₁ by floating state above the high-friction portion 25 of the upper surface 24 of the reel base body 1. Therefore, by rotating the reel base body 1 by a small angle with a small force, or by applying a small tension to the running tape wound on the tape reel 9 at the time of tape loading,
When the tape reel 9 is relatively slid on the reel base body 1, for example, in the direction of arrow X, the lower ends 22 of the plurality of driven claws 12 of the tape reel 9 move from the upper ends 26 of the second claws 23. As shown in FIGS. 3 (C) and 3 (c), the first claw 21 urged upward by the spring 4 meshes with the plurality of reel grooves 11, and at the same time, the second claw 23 One nail 21 enters a plurality of reel grooves 11 other than the meshed one. At this time, the high friction portion 25 on the upper surface 24 of the reel base body 1
The lower surface of the tape reel 9, which has been a state of floating above the only height H ₁ of the annular projection 13 is crimped by lowering by a height H ₁ to the high friction portion 25 of the upper surface 24 of the reel base body 1 Then, the mounting of the tape cassette on the reel base body 1 is completed. Accordingly, the lower end 22 of the plurality of the driven nail 12 in FIG. 3 (C) the height difference of H ₂ with the tip of the abutting surface 27 of the second pawl 23, the height shown in FIG. 3 (a) It is equal to the H _1.

Then, even when the lower ends 22 of the plurality of driven claws 12 do not abut on the tips of the tapered portions of the first claws 21, the inclined surfaces of the lower ends 22 of the plurality of driven claws 12 and the first If the upper end 28 of the claw 21 is in contact with the tapered portion, the first claw
21 may be pushed down to the root of the central shaft portion 2 without engaging with the plurality of reel grooves 11. That is, FIG. 3 (B)
And (b), the lower end 22 of the plurality of driven claws 12
3A and FIG. 3A, even when the inclined surface portion barely touches the inclined surface of the tapered portion of the upper end 28 of the first claw 21. The tape reel 9 is relatively slid on the reel base body 1 by rotating the reel base body 1 by a small angle with force or by applying a slight tension to the running tape wound on the tape reel 9 during tape loading. Then, the lower ends 22 of the plurality of driven claws 12 of the tape reel 9 are connected to the upper ends of the second claws 23.
In order to be able to move from 26, as the lower surface of the annular projection 13 of the tape reel 9 is in a state of floating above the high-friction portion 25 of the upper surface 24 of the reel base body 1 by a small gap h ₁ Is set.

In this case, FIG. 3 (B) and a plurality of height difference H ₃ with a small clearance between the tip of the tapered portion of the upper end 28 of the lower end 22 of the driven nail 12 first pawl 21 in the state of (b) h ₁ is, H ₁ ≧ between the height H ₁ in the state of FIG. 3 (a) and (a)
If the relationship of h ₁ + H ₃ is not satisfied, FIG.
And in the state of FIG. 3 in which the lower surface of the annular projection 13 is lowered height H ₃ minutes of the tape reel 9 from the state of (a) (B) and (b), the lower end of the annular projection 13 of the tape reel 9 the lower end of the reel base can not be provided h ₁ of clearance between the high friction portion 25 of the upper surface 24 of the main body 1, a plurality of the drive pawl 12
Depending on the contact state between the upper end 22 of the first claw 21 and the annular projection 13 on the lower surface of the tape reel 9,
There may be a case where the pressure is applied to the high friction portion 25 of the 24.
In such a case, the tape reel 9 is attached to the reel base body 1.
FIGS. 3A and 3A show that the lower end 22 of the plurality of driven claws 12 of the tape reel 9 is moved from the upper end 26 of the second claw 23 by relatively sliding the upper end. It cannot be performed with a very small force as shown in FIG.

Therefore, for example, in the state intermediate between FIGS. 3A and 3A and FIGS. 3B and 3B, the lower ends 22 of the plurality of driven claws 12 and the upper ends 28 of the first claws 21 are formed. Assuming that H is the height difference in the contact state with the leading end, and h is the gap between the annular convex portion 13 on the lower surface of the tape reel 9 and the high friction portion 25 on the upper surface 24 of the reel base body 1 at that time, In each contact state, the lower ends 22 of the plurality of driven claws 12 and the first claws 21
The gap h must always satisfy the relationship h + H ≧ h ₁ + H ₃ with respect to the height difference H that changes with the state of contact with the upper end 28. Conversely, in each contact state, the minimum required gap h between the annular convex portion 13 at the lower end of the tape reel 9 and the high friction portion 25 on the upper surface 24 of the reel base body 1.
Should satisfy the relationship of h + H = h ₁ + H ₃ . That is, the height difference H that changes in each contact state
On the other hand, by changing the gap h while always satisfying the relationship of h = h ₁ + H ₃ −H, it is possible to always maintain the minimum required gap.

By the way, the gap h between the annular convex portion 13 at the lower end of the tape reel 9 and the high friction portion 25 on the upper surface 24 of the reel base body 1 is such that the lower ends 22 of the plurality of driven claws 12 are provided on the reel base body 1. The lower end of the second claw 23 stops and the tape reel 9 stops descending. The gap h is equal to the upper end 26 of the second claw 23. It is determined by the height of the contact surface 27 with the lower end 22 of the plurality of driven claws 12. And in this embodiment, FIG.
As shown in (C), the contact surface 27 of the upper end 26 of the second claw 23
Since the upper end 28 of the first claw 21 is tapered upward like the upper end 28, the lower end 22 of the plurality of driven claws 12 and the tip of the contact surface 27 between the upper end 26 of the second claw 23 When H ₄ the height difference between the upper end 28 of the lower end 22 of the plurality of the driven nail 12 and the first pawl 21
Height difference according to the change in height difference H from the tip of the tapered portion of
H ₄ can be constantly changed. Therefore, the height difference
Since it is also a gap h determined by H ₄ is changed according to the change in height H, while satisfying the relationship of h = h ₁ + H ₃ -H can change the gap h, the plurality of the driven nail 12 In the contact state between the lower end 22 of the first claw 21 and the upper end 28 of the first claw 21, it is possible to always maintain the minimum required gap h.

Thus, the lower ends 22 of the plurality of driven claws 12 and the first claws 21
The height between the lower end 22 of the plurality of driven claws 12 and the tip of the contact surface 27 of the upper end 26 of the second claw 23 in accordance with a change in the height difference H between the upper end 28 and the tip of the tapered portion. by changing the difference H _4, by keeping always a gap h is minimally required for the high friction portion 25 of the lower end of the annular projection 13 and the upper surface 24 of the reel base body 1 of the tape reel 9, the tape reel 9 Is relatively slid on the reel base body 1 to lower the lower ends 22 of the plurality of driven claws 12 of the tape reel 9.
Can be moved from the upper end 26 of the second claw 23. Therefore, the annular convex portion 13 on the lower surface of the tape reel 9 which has not been brought into contact with the high friction portion 25 on the upper surface 24 of the reel base body 1 is lowered, and the high friction portion 25 on the upper surface 24 of the reel base body 1 is lowered.
When the tape reel 9 is pressed against the reel base body 1, the tape reel 9 does not suddenly descend from the state of being most floating above the high friction part 25 on the upper surface 24 of the reel base body 1 to the high friction part 25 of the upper surface 24 of the reel base body 1. The tape reel 9 can be gradually lowered, so that the impact given to the tape reel 9 can be minimized. Therefore, the impact when the tape reel 9 descends to the high friction portion 25 on the upper surface 24 of the reel base body 1 can be used. In the tape cassette, the running tape wound on the tape reel 9 cannot follow the change in the height difference due to the lowering of the tape reel 9, and the tape may be in contact with the reel flange of the tape reel 9, thereby causing tape damage. By doing so, the mounting of the tape cassette on the reel base body 1 can be completed.

When the tape reel 9 is relatively slid on the reel base body 1, the first claw 21 is rotated by rotating the tape reel 9 in the winding direction of the running tape wound around the tape reel 9. Engages with the plurality of reel grooves 11 to complete the mounting of the tape cassette on the reel base body 1 and simultaneously remove the slack of the tape, thereby preventing tape damage after the completion of the mounting of the tape cassette.

Further, since the first claw 21 needs to engage with the plurality of driven claws 12 of the tape reel 9, the upper end 28 of the first claw 21 is raised upward so as to mesh well with the plurality of reel grooves 11. It is formed in a tapered shape. However, by restricting the range in which the first claw 21 can be lowered by another means, for example, by providing a projection on the central shaft portion 2, the tape reel 9 can be separated from the high friction portion 25 on the upper surface 24 of the reel base body 1. In order to ensure that the tape reel 9 has a gap with the high friction portion 25 on the upper surface 24 of the reel base body 1 as can be seen from the above description, 9
Need to be floated above the high friction portion 25 on the upper surface 24 of the reel base 1. On the other hand, in the case of the present embodiment, the reels of the tape reel 9 are provided by the second claws 23 irrespective of the first claws 21 which need to be engaged with the plurality of driven claws 12 of the tape reel 9. Since the descent to the base body 1 is stopped, the shape of the contact surface 27 of the upper end 26 of the second claw 23 can be set freely according to the shape of the lower end 22 of the plurality of driven claws 12, Therefore, it is easy to set the gap between the tape reel 9 and the reel base body 1 to an optimum value.

Further, by restricting the lowerable range of the first claw 21 by another means as described above, the tape reel 9 can be in a state having a gap with the high friction portion 25 on the upper surface 24 of the reel base body 1. When the plurality of driven claws 12 of the tape reel 9 come into contact with the first claws 21 when the center hole 10 of the tape reel 9 fits vigorously into the center shaft 2, the first nail
Since the first claw 21 is pressed down to the base of the center shaft portion 2, the first claw 21 comes into contact with the restricting means for restricting the range in which the first claw 21 can be lowered. And the first nail 21
There is a problem that the component parts are damaged. On the other hand, in the case of the present embodiment, in order for the lowering of the tape reel 9 to the reel base body 1 to be stopped by the second claw 23 fixed on the reel base body 1, the tape reel 9 is stopped. A second claw 23 having sufficient strength to withstand even when a plurality of driven claws 12 abut against each other can be formed, and the center hole 10 of the tape reel 9 is inserted into the center shaft 2. The first claws 21 can be securely connected to the tape reel 9 even when they are fitted vigorously.
It is possible to provide a highly reliable reel base that can smoothly mesh with the plurality of reel grooves 11.

As described above, according to the present embodiment, when the plurality of driven claws 12 of the tape reel 9 are pushed down with the first claws 21 at the base of the central shaft portion 2, the plurality of driven claws of the tape reel 9 are 12
The tape reel is provided at a height such that the annular projection 13 on the lower surface of the tape reel 9 does not come into contact with the high friction portion 25 on the upper surface 24 of the reel base body 1 by providing a second claw 23 in contact with the lower end 22 of the reel. The height of the contact surface 27 of the upper end 26 of the second claw 23 with the lower ends 22 of the plurality of driven claws 12 is set so that the lowering of the second claw 9 stops, and the shape of the contact surface 27 is set to the first position. Since the plurality of driven claws 12 of the tape reel 9 are in contact with the first claws 21, the plurality of driven claws are formed in a tapered shape upward like the upper end 28 of the claw 21. The annular convex portion 13 on the lower surface of the tape reel 9 is pressed against the high friction portion 25 on the upper surface 24 of the reel base body 1 with the claw 12 keeping the first claw 21 pressed down to the root of the central shaft portion 2. There is no. Therefore, the reel base 1 is rotated by a very small force by a very small angle as compared with the state in which the annular projection 13 on the lower surface of the tape reel 9 is pressed against the high friction portion 25 on the upper surface 24 of the reel base 1. The first claw 21 of the reel base body 1 is smoothly inserted into the plurality of reel grooves 11 of the tape reel 9 simply by applying a slight tension to the running tape wound around the tape reel 9 at the time of tape loading. The second claw 23 can also engage with the plurality of reel grooves 11 other than the first claw 21 and the lower surface of the tape reel 9 in that state. Is pressed against the high friction portion 25 on the upper surface 24 of the reel base body 1 to complete the mounting of the tape cassette on the reel base body 1, and the tape reel 9 and the reel base body 1 are integrated. Become , The torque of the reel motor is changed from the reel base body 1 to the tape reel 9.
The first claw 21, the high friction portion 25, and further the second claw 23 reliably transmit the tension, and it is possible to perform high-accuracy tension servo with high responsiveness of the running tape by the reel motor.

In this embodiment, the high friction portion 25 is made of rubber or the like. However, the high friction portion 25 is not limited to being fixed to the upper surface 24 of the reel base body 1 by a member different from the reel base body 1. Instead, for example, a fine groove may be formed on the upper surface 24 itself of the reel base body 1, a fine protrusion may be provided, or the annular convex portion 13 on the lower surface of the tape reel 9 may be provided.
Some means for adsorbing to the upper surface 24 of the reel base body 1 may be provided, and any structure that increases the friction between the lower surface of the tape reel 9 and the upper surface 24 of the reel base body 1 may be provided. There may be.

Further, even in a state where the upper surface 24 of the reel base body 1 does not have the high friction portion 25, the upper end 26 of the second claw 23 abutting on the plurality of driven claws 12 is located on the lower surface of the tape reel 9. Since the distance from the center of the reel base body 1 is shorter than the upper surface 24 of the reel base body 1 to which the annular convex portion 13 is crimped, the second
The tangential force generated at the upper end 26 of the claw 23 is larger than the tangential force generated on the upper surface 24 of the reel base 1 when the same torque is applied to the reel base 1. When the relative convexity on the lower surface of the tape reel 9 is not brought into contact with the upper surface 24 of the reel base body 1 when the relative convexity of the lower surface of the tape reel 9 is attempted to slide relatively on the reel base body 1, the circular convexity on the lower surface of the tape reel 9 is obtained. Since the portion 13 can be slid with a smaller torque than when the portion 13 is pressed against the upper surface 24 of the reel base 1, the reel base 1 can be rotated with a smaller force by a smaller angle, or The lower end of the plurality of driven claws 12 can be moved from the upper end 26 of the second claw 23 only by applying a small tension to the tape wound on the tape reel 9 at the time of loading. 24 high friction The effect is the same as in the case where the unit 25 is provided.

Further, in the present embodiment, the shape of the contact surface 27 of the second claw 23 is formed to be upwardly symmetrical and tapered in a left-right symmetric shape, but the shape of the contact surface 27 is limited to a left-right symmetric shape. However, if it is a shape that can guide the plurality of driven claws 12 of the tape reel 9 fitted into the central shaft portion 2, the tapered shape may be formed in an asymmetrical left and right shape, or may be formed only in one direction. The same effect can be obtained even if it is formed into a shape having an inclined surface, or even if it is formed into a shape having a convex portion in an arc shape.

The contact surface 27 of the upper end 26 of the second claw 23 is made of a material having a smaller friction coefficient than the high friction portion 25 of the upper surface 24 of the reel base body 1 or a component having a smaller friction coefficient. It goes without saying that a greater effect can be obtained by doing so.

As described above, according to the present invention, a tape reel having a plurality of drive claws can be slid up and down along a center shaft provided on a reel base body so that a center hole of the tape reel is inserted, and A first claw that can be engaged with the plurality of driven claws is provided, and a second claw that can contact the lower ends of the plurality of driven claws is provided on the reel base body near the central shaft portion, and the plurality of driven claws are provided. When the driving pawl engages with the first pawl and pushes it down to the root of the central shaft, the plurality of driven pawls come into contact with the second pawl and the tape reel does not come into contact with the reel base body. Since the height of the second claw is set and the upper end of the second claw has a convex shape, a plurality of driven claws push the first claw down to the base of the central shaft portion. In this state, the annular projection on the lower surface of the tape reel is not pressed against the upper surface of the reel base body, and Can smoothly engage the plurality of reel grooves of the tape reel, and in this state, the mounting of the tape cassette to the reel base body is completed, and the torque of the reel motor is transferred from the reel base body to the tape reel. It can be transmitted reliably, and its practical effect is great.

[Brief description of the drawings]

FIGS. 1 (a), (b) and 2 (a), (b) are cross-sectional views and vertical cross-sectional views showing different mounting states of a tape reel on a reel base according to an embodiment of the present invention, and FIG. FIG. 4 is an explanatory view of an operation of a main part showing a tape reel mounting operation on the reel base, FIG. 4 is a side view of the conventional reel base, FIG. 5 is a front view of a tape reel mounted on the conventional reel base, and FIG. FIG. 1 is a longitudinal sectional view showing a state in which a tape reel is mounted on a conventional reel base. DESCRIPTION OF SYMBOLS 1 ... Reel base main body, 2 ... Center shaft part, 3 ... Reel hook, 7 ... Reel cap, 9 ... Tape reel, 10
... Center hole, 11 ... Reel groove, 12 ... Driven pawl, 21 ...
.., First claw, 22... Lower end of driven claw, 23.
26: Upper end of second claw, 28: Upper end of first claw.

Continuation of the front page (72) Inventor Makoto Okuda 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-60-226049 (JP, A) (58) Fields investigated (Int .Cl. ⁶ , DB name) G11B 15/32

Claims (1)

(57) [Claims] 1. A center shaft portion provided on a reel base body and inserted into a center hole portion of a tape reel having a plurality of driven claws; and a center shaft portion slidably provided in the center shaft portion in the axial direction. A first claw engageable with the plurality of driven claws; and a first claw provided on the reel base body near the center shaft portion, wherein the plurality of driven claws are engaged with the first claw. The height of the tape reel is set so that the tape reel comes into contact with the plurality of driven claws when the first claw is pushed down to the base of the central shaft portion, and the tape reel has a gap with the reel base body. And a second claw, and an upper end of the second claw is formed in a convex shape.