JPS60191457A - Tape tension servo device - Google Patents

Abstract

PURPOSE:To obtain easily tape tension with high precision by providing a control member which adjusts the tensile force of an elastic body for energizing a tension detection member and also rotates by the sliding of an operating member to bring a tension band into contact with a reel turntable winding part and also release it, and adjusting the rotational range of the control member. CONSTITUTION:The operating member 34 is slid as shown by A' in an unloading state and in fast-forward and rewind modes; the bin 49 of the control member 46 abuts on the straight part 37 of the operating member 34, the control member 46 is rotated counterclockwise against a spring 52, and a bent part 50 leaves the tip of an adjusting screw 55. At this time, the tension band 27 moves counterclockwise as to the reel turntable winding part 26, and a tension detection member 6 is rotated clockwise by a spring 18. Therefore, no energizing force is applied to the tension detecting member 6 and the tension band 27 slacks and is released from the reel turntable winding part 26. Consequently, the adjusting screw is only turned to set proper tape tension.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a tape tension servo device suitable for video tape recorders and the like.

[Background of the invention]

Figure 1 shows a conventional video tape recorder (hereinafter referred to as V'l').
An example of a tape running system (referred to as R) is shown below. # In the diagram, 1 is the chassis, 2 is the head drum, 6 is the tape, 4
5 is a supply reel, 5 is a take-up reel, 6 is a tension detection member, 7 is a tape cassette, 8 is a capstan, and 9 is a pinch roller.

Conventionally, in V'I'H, as shown in FIG. 1, the tape 6 is run from a supply reel 4 attached to a tape cassette 7 through members such as rollers and posts that are not labeled. , runs around the outer periphery of the head cylinder 2 in a spiral shape at a predetermined angle, and is further wound up by the take-up reel 5 attached to the tape cassette 7 via a member not labeled. The running of the tape 6 is carried out by a capstan 8 and a pinch roller 9, which are rotationally driven while holding the tape 6 therebetween. Appropriate back tension must be applied. In order to apply such back tension to the tape 3, a tension detection member 6 is provided, and a tension band member is provided at the reel joint winding portion to which the supply reel 4 is attached. Further, the back tension must be uniform and appropriate from the beginning to the end of winding the tape 3, but this adjustment can be done by adjusting the position of the tension detection member 6 and adjusting the pressure contact force of the tension band member. It is now possible to do so.

Next, such back tension adjustment will be explained using FIGS. 2 and 3. Note that FIG. 2 is a plan view showing a conventional tape tension servo device including the tension detection member 6 of FIG. 1 and the reel joint winding section of the supply reel 4, and FIG. 2, 1' is a chassis (till wall, 10 is a tension pole, 11 is a pin, 12.15 is an arm, 14 is a step, 15 is a rotation boss, 16 is an arm, 17 is a pin, 1
8 is a spring, 19 is a spring mounting member, 20 is a screw, 21 is long, 22 is an arm, 23 is a notch, 24 is a dowel, 25 is an elongated hole, 26 is a reel joint winding part, 27 is a tension band, 28 is the tension band mounting member, 29
is a pin, 30 is long, 31 is a screw, 32 is a rotating boss, 3
3 is an arm, 34 is an operating member, 35 is an elongated hole, 36 is a dowel, 67 is a straight part, 38.39 is a recessed part, and as in Fig. 1, 1 is a chassis, 3 is a tape, and 4 is a supply. The reel 6 is a tension detection member.

In FIGS. 2 and 3, the tension detection member 6 is rotatably attached to a pin 11 fixedly provided on the chassis 1, and has a tension ball 10 at its tip, which the tape 3 contacts, and Two arms 12.13 are provided in one piece.

The arm 12 is provided with a stepped portion 14, and a spring 18 is suspended between the stepped portion 14 and a notch 23 provided in the arm 22 of the spring mounting member 19. biased in the direction.

Further, the arm 12 is provided with a tip 17 that penetrates the chassis 1 on the opposite side to the side where the stepped portion 14 is provided. A rotary boss 15 is attached to the arm 13, an arm 16 is rotatably provided on the rotary boss 15, and an end of a tension band 27 is fixed to the arm 16.

There are screw holes (not shown) and dowels 24 on the chassis side wall 1'.
The spring mounting member 19 is provided with an elongated hole 21,
25 is provided, and the screw 2o is passed through the elongated hole 21 and engaged with the screw hole, and the elongated hole 25 is fitted into the dowel 24. By loosening the screw 20, the spring mounting member 19 can be slid in the directions of arrows B and B', and by tightening the screw 2°, the spring mounting member 19 is fixed to the chassis side wall 1'. .

On the other hand, the chassis 1 has a pin 29 and a screw hole (not shown).
A tension band attachment member 28 is rotatably attached to this pin 29. The tension band mounting member 28 has an elongated hole 60 and a rotating boss 3.
2 is provided.

The screw 61 passes through the long diameter 30 and engages with the above screw hole,
Further, an arm 63 to which the end of the tension band 27 is fixed is rotatably attached to the rotation boss 62. When the screw 31 is loosened, the tension band attachment member 28 can be rotated in the direction of arrow 0.0 with respect to the pin 29, and by tightening the screw 31,
The tension band attachment member 28 is fixed to the chassis 1.

The tension band 27, whose end is fixed to the arm 16.33, is provided with a felt material and is wound around the reel base winding part 26 over a predetermined angle so that the felt material abuts the reel base winding part 26. It applies a braking force to the reel stand winding section 26.

A dowel 66 is fixed to the back surface of the chassis 1, and the actuating member 6
The dowel 36 is fitted into the elongated hole 65 provided in the actuating member 64, so that the actuating member 64 can be moved in the directions of the arrows A and A'. Further, one side surface of the actuating member 34 is composed of a linear portion 67 and a concave portion 68, and the arm 1 of the tension detecting member 6
The pin 17 provided on the pin 2 contacts the straight portion 67 or the concave portion 68 due to the biasing force of the spring 18. During unloading, fast forwarding, rewinding, etc. of the tape 3, the actuating member 64 is slid in the direction of arrow A. Therefore, the pin 17 comes into contact with the straight portion 67 on the side surface of the actuating member 34, and the tension detecting member 6 rotates counterclockwise against the urging force of the spring 18. As a result, the tension detection member 6 moves to the storage position when not in operation. On the other hand, when loading the tape 6, the actuating member 64 slides in the direction of arrow A, and the pin 17
It fits into the recessed part 68 on the side surface of No. 4. Therefore, the tension detection member 6 is rotated clockwise by the biasing force of the spring 18 and moved from the storage position, so that the tension ball 10 comes into contact with the tape 3.

Next, the operation of this conventional tape tension servo device will be explained.

During unloading, fast forwarding and rewinding of the tape, the actuating member 64 is slid in the direction of arrow A' force, and the pin 17 provided on the arm 12 of the tension detecting member 6 is attached to the side surface of the actuating member 64. It is in contact with the straight portion 37. Therefore, the tension detection member 6 is rotated counterclockwise against the biasing force of the spring 10 and is at the position shown by the two-dot chain line, that is, the storage position. At this time, the arm 16 of the tension detection member 6 is also naturally rotating in the counterclockwise direction, the tension band 27 is loosened, and the reel base winding section 26 is in a non-braking state.

Next, when the tape 6 is loaded and the recording or playback mode is set, the actuating member 34 slides in the direction of arrow A, and the pin 17 provided on the arm 12 causes the actuating member 34 to slide.
It fits into the recessed part 38 on the side surface of. For this reason, the tension detection member 6 rotates clockwise due to the biasing force of the spring 18, and the tension ball 10 comes into contact with the tape 3. At the same time, the arm 13 also rotates clockwise.
The tension band 27 contacts the reel stand winding portion 26.

When the tape 6 runs, the pressing force of the tape 6 against the tension ball 10 changes according to the tension of the tape 6, and therefore the tension detection member 6 rotates according to the tension of the tape 3.

For this purpose, the arm 16 also rotates and the reel stand winding section 26
The tightness of the tension band 27 relative to the position changes.

Now, when the tension of the tape 3 increases, the tension detection member 6 rotates counterclockwise, and the arm 13 also rotates counterclockwise, loosening the tension band 27. The braking force of the rotating portion 26 is relaxed and the tension of the tape 6 is reduced. Conversely, when the tension of tape 6 decreases, tension ball 1
Since the pressing force of the tape 6 against 0 decreases, the tension detecting member 6 rotates clockwise due to the biasing force of the spring 10. Therefore, the arm 13 also rotates in the clockwise direction, and the tension band 27 is rotated clockwise. The reel stand winding member 26 is tightened more, and the tension of the tape 6 is increased.

In this way, tension can be applied to the tape 6, but the tension applied to the tape 6 changes depending on the tape winding groove of the supply reel 4 attached to the reel stand winding section 26. Such changes in tension should be eliminated by the tension detection by the tension detection member 6 and the degree of tightening of the reel base winding part 26 by the tension band 27, but as the tape 6 runs, the tape winding on the supply reel 4 As the amount of applied tape changes, the running path of the tape 6 changes and the contact position of the tension pole 10 with the tape 3 changes, so as the amount of tape wound on the supply reel 4 decreases, the amount of tape wound on the supply reel 4 increases. The tension detection member 6 rotates clockwise, and the tension band 27 tightens the reel base winding part 26 more and more. This is because the tension of the tape 3 decreases as the amount of tape wound on the supply reel 4 decreases. As described above, as the reel base winding part 26 is tightened more and more, the braking force of the reel base winding part 26 gradually increases, but due to this increase in braking force, the tension of the tape 3 is constantly maintained. There is no problem as long as it is kept constant. However, in reality, immediately after the tape tension servo device is assembled by attaching each member to the chassis 1, the tape may 3 is wound up from the supply reel 4 to a certain extent, and as mentioned above, the tension band 27 may sufficiently tighten the reel base winding part 26 and cannot be tightened any further. , the tension detection member 6 cannot rotate clockwise, the tension ball 10 separates from the tape 3, and the tension of the tape 3 cannot be controlled thereafter. In addition, due to the balance with the biasing force of the spring 18, the tension is not necessarily maintained constant, and the tension of the tape 3 is not necessarily maintained constant between the state where the tape 3 is completely wound on the supply reel 4 and the state where the tape 3 is completely wound. Tension changes.

Therefore, it is necessary to make an adjustment to make it possible to keep the tension of the tape B constant at all times, and the means for this purpose is to use a spring mounting member 19 that is slidable so that the tension of the spring 18 can be adjusted. This is a tension band attachment member 28 that is movable so that the tightening of the tension band 27 to the reel base winding portion 26 can be adjusted.

As mentioned above, the tension band attachment member 28 is rotatable with respect to the bin 29 by loosening the screw 31. Then, loosen the screw 31, insert the tip of a screwdriver or the like into the recess 39, pry the tension band attachment member 28, and rotate it in the force direction of arrow C or C'. When the tension band attachment member 28 is rotated in the direction of arrow C, the tension band 27 is loosened, and the rotation range of the tension detection member 6 in the clockwise direction is further expanded.

Further, by loosening the screw 20, the spring mounting member 19 can be displaced in the directions of arrows B and B', and by displacing it in the direction of arrow B, the tension of the spring 10 increases, and by displacing it in the direction of arrow B, the spring mounting member 19 can be displaced in the directions of arrows B and B'. Since the tension of the spring 10 is reduced, the tension of the spring 10 can be adjusted by the spring attachment member 19 to adjust the repulsive force of the tension detection member 6 against the tape 3. .

Therefore, in order to keep the tension of the tape 6 constant regardless of the amount of tape wrapped around the supply reel 4, the tape 3 is actually run, and the spring attachment member 19 and the tension band attachment member 28 are adjusted while measuring the tension. adjust.

By the way, when adjusting the spring mounting member 19 and the tension band mounting member 28, such adjustment is performed by stopping the tape 6 and loosening the screws 20 and 61. After adjustment, tighten the screws 20 and 31 and tighten the tape 3 again. The tension of the tape 6 is measured. and,
The spring attachment member 19 and the tension band attachment member 28 are repeatedly adjusted until a predetermined uniform tension is obtained.

However, adjustment of the tension of the tape 3 is very delicate, and for this reason, the spring mounting member 19
The tension band attachment member 28 must be adjusted many times, and the adjustment requires a lot of effort and time, as the screws 20 and 31 must be loosened and tightened each time. Moreover, the adjustment was rough and the tension servo was not sufficiently adjusted, resulting in a decrease in the performance of the VTR.

Furthermore, as explained earlier, during unloading, fast forwarding, and rewinding mode, the tension detection member 6 rotates to the position shown by the two-dot chain line, and when in this position, the tension band 27 It becomes loose and separates from the reel stand winding section 26.

Therefore, the tension detection member 6 protrudes from the chassis 1, and a space is required for this purpose.
This will inhibit the miniaturization of T'H.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a tape tension servo device that eliminates the drawbacks of the prior art described above, allows tape tension to be adjusted easily and with high precision, and can be miniaturized.

[Summary of the invention]

In order to achieve this object, the present invention makes it possible to adjust the tension of an elastic body that biases a tension detection member with a first adjustment screw, and rotates by sliding of an operating member, A control member is provided for bringing the tension band into contact with and releasing from the reel base winding part, and the rotation range of the control member can be adjusted with a second adjustment screw. , the tape tension can be adjusted by the first and second adjustment screws while feeding the tape, and the tension is adjusted when the tension band is released from the reel base winding section by the control member. The present invention is characterized in that the amount of rotational force of the detection member is set in a direction in which the tension detection member does not protrude from the chassis surface.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 4 is a plan view showing one embodiment of the tape tension servo device according to the present invention, in which 40 is a tension adjustment arm, 41 is a pin, 42 is a stepped portion, 43 is a protruding portion, 44 is a bent portion, and 45 is a Adjustment screw, 46 is a control member, 47 is a pin, 48 is a rotation boss, 49 is a pin, 50 is a bent portion, 51 is a protrusion, 52 is a spring, 56 is a protrusion, 54 is a bending portion, 55 is an adjustment screw, 56 .57 is a stopper, and the second
Parts corresponding to the figures are given the same reference numerals, and some explanations will be omitted.

FIG. 5 is a side view of FIG. 4, and parts corresponding to those in FIG. 5 are given the same reference numerals.

In FIGS. 4 and 5, the pin 4 installed in the chassis 1
A control member 46 is rotatably provided at 7. The control member 46 is provided with a rotating boss 48, a pin 49, a bent portion 50, and a protruding portion 51.

The rotary boss 48 is integrally provided with an arm 33 to which one end of the tension band 27 that can be wound around the reel stand winding section 26 is fixed. The other end of the tension band 27 is connected to the tension detection member 6 as shown in FIG.
It is fixed to an arm 16 that is integrated with a rotary boss 15 connected to the rotary boss 15.

One end of a spring 52 is hung on the protrusion 51,
The other end of this spring 52 is hung on a protrusion 53 provided on the chassis side wall 1'.
2, the control member 46 is biased clockwise.

The pin 49 corresponds to the pin 17 in FIG. It is possible to contact.

The bent portion 54 is formed by hollowing out a part of the chassis 1.
It is formed to protrude from the surface of the control member 46, and is provided with a hole having a female thread, into which an adjustment screw 55 is engaged.
It becomes possible to contact 0.

On the other hand, a pin 41 is installed in the chassis 1.
A tension adjustment arm 40 is rotatably attached to 1. The tension adjustment arm 40 is provided with a stepped portion 42 and a protruding portion 43, and a spring 18 is suspended between the stepped portion 42 and a stepped portion 14 provided on the arm 12 that is integrated with the tension detection member 6. . Further, a bent portion 44 is formed by hollowing out a part of the chassis 1 so as to protrude from the surface of the chassis 1, and a hole having a female thread is provided in this bent portion 44, and an adjustment screw 45 is engaged with the bent portion 44.

Therefore, the spring 18 is connected to the tension detection member 6'f.
: Forced to rotate clockwise with respect to pin 11,
Further, the tension adjustment arm 40 is urged to rotate clockwise about the pin 41. Due to this biasing force, the protrusion 43 integral with the tension adjustment arm 40 comes into contact with the tip of the adjustment screw 46, thereby preventing the tension adjustment arm 40 from rotating in the i+ force direction.

Next, the operation of this embodiment will be explained.

First, during unloading, fast forwarding, and rewinding mode, the actuating member 64 is slid in the direction of arrow A', and the pin 49 installed in the control member 46 is attached to the straight portion 67 on the side surface of the actuating member 34. are in contact. In this case, the control member 46 is rotated counterclockwise against the biasing force of the spring 52, and the bent portion 50 is separated from the tip of the adjustment screw 55.

When the control member 46 is in this state, the tension band 27 has moved counterclockwise with respect to the reel base winding portion 26 as the control member 46 rotates counterclockwise, and therefore the tension band The counterclockwise urging force of the tension detecting member 6 via 27 is loosened, and the tension detecting member 6 is rotated clockwise by the urging force of the spring 18.

The rotation angle of the control member 6 in the counterclockwise direction is equal to or greater than the angle at which the tension detection member 6 rotates clockwise and the biasing force applied to the tension detection member 6 by the spring 18 becomes zero. In this case, no urging force is applied to the tension detection member 6, and the tension band 27 is slackened and released from contact with the reel base winding portion 26. Therefore, no braking force is applied to the reel stand winding section 26,
Unloading, fast forwarding, and rewinding are performed smoothly.

Further, the tension detection member 6 is in a non-operating state,
Since it is rotated in the opposite direction to the chassis side wall 1', it does not protrude from the surface of the chassis 1, and the space for the tension detection member B is reduced.

Note that in the fast forward and rewind modes, the tension ball 10 comes into contact with the tape 6 and the clockwise rotation of the tension detection member 6 is restricted. There will be no interference with the release from. Further, the stopper 57 prevents abnormal rotation of the tension detection member 6 in the clockwise direction, so that the movement of the loading member (not shown) during loading and unloading is not hindered.

Further, the stopper 56 prevents the tension detection member 6 from abnormally rotating counterclockwise, and prevents the tension detection member 6 from protruding from the surface of the chassis 1.

Next, after loading, when the recording or reproducing mode is set, the actuating member 34 slides in the direction of arrow A. Due to this sliding movement of the actuating member 64, the pin 49 planted on the control member 6 faces the recessed part 68 on the side surface of the actuating member 64, and the urging force of the spring 52 causes the pin 49 to move into the recessed part 68.
The control member 46 is rotated clockwise so as to fit into the position.

This rotation of the control member 46 causes the tension band 27 to
is pulled toward the control member 46, and at the same time, the tension detection member 6 rotates counterclockwise. As the tension detecting member 6 rotates, the biasing force of the spring 18 gradually increases, giving a biasing force to the tension detecting member 6 to rotate clockwise.

When the bent portion 50 of the control member 46 comes into contact with the tip of the adjustment screw 55, the control member 46 stops rotating. The tension detection member 6 receives a counterclockwise rotational force according to the tension of the chief roller and a clockwise rotational force from the spring 18, and stops in a state where both are balanced. Therefore, when the tension of the tape 3 changes, the tension detection member 6 rotates as described above, and the degree of tightening of the tension band 27 against the reel base winding part 26 changes accordingly, and the tension of the tape 3 changes. It works to keep the tension constant.

Note that the tension of the spring 52 is sufficiently greater than the tension of the spring 18, so that even if the tension detection member 6 rotates, the control member 46 remains stationary.

Further, in the stop mode, the actuating member 34 is moved by the arrow A
' direction, the tension pole 10 comes into contact with the tape 6, and the tension detection member 6 is restricted from rotating clockwise. Therefore, the tension detection member 6 is slightly moved clockwise by the spring 18. energized. However, the tension band 27 is in a slack state and no braking force is applied to the reel base winding portion 26. This also applies to fast forward and rewind modes. - During unloading, as mentioned earlier, no biasing force is applied to the tension detection member B.

Furthermore, when loading the tape 3, the tape 6 is installed on the running system and at the tension pole 10.
As a result, the tension detection member 6 rotates counterclockwise to a certain extent, but at the same time, the biasing force of the spring 18 is also generated, and the tension detection member 6 stops when the two are balanced. At this time, of course, the tension band 27 is slack.

The operation of this embodiment has been described above. Next, the tape tension adjusting means will be explained.

It can be rotated in the direction. When the tension adjustment arm 40 rotates counterclockwise, the spring 18 is pulled toward the tension adjustment arm 40 side, and the biasing force applied to the tension detection member 6 in the clockwise direction increases. On the other hand, when the tension adjustment arm 40 rotates clockwise, the biasing force of the tension detection member 6 decreases. Therefore, by adjusting the adjustment screw 45, the biasing force of the tension detection member B can be adjusted.

Further, by operating the adjustment screw 55 with a screwdriver or the like, the clockwise rotation limit of the control member 46 is adjusted.

When the amount of clockwise rotation by the adjustment screw 55 of the control member 46 is small, the range in which the tension detection member 6 can be rotated clockwise is large, and therefore the amount of winding of the tape 3 on the supply reel 4 is reduced. , the running path of the tape B changes, and the motivation ball 10 comes into sufficient contact with the tape 3. However, the degree of tightening of the tension band 27 against the reel stand winding portion 26 becomes weaker, and therefore the tension applied to the tape 6 becomes weaker.

On the other hand, when the amount of clockwise rotation by the adjustment screw 55 of the control member 46 is large, the degree of tightening of the tension band against the reel base winding part 26 is strong, and a large tension can be applied to the tape 6. , the range in which the tension detection member 6 can rotate clockwise becomes narrower.

Therefore, by adjusting the adjustment screw 55, even if the tape winding position of the supply reel 4 changes and the running path of the tape 6 changes, the tension pole 10 can be made to always come into contact with the tape 6. The degree of tightening of the tension band 27 against the reel stand winding portion 26 can be adjusted. Further, by adjusting the adjustment screw 45, the biasing force of the spring 18 against the tension detection member 6 can be adjusted.

Therefore, by adjusting the adjustment screws 45 and 55, the spring 18 is biased to properly apply tension to the tape 6, and the reel base winding portion 2 of the tension band 27 is energized.
The degree and relationship of tightening for 6 can be set. As mentioned earlier, the thickness of the felt material crimped to the tension band 27 and the diameter of the reel base winding portion 26 involve design errors, but the tension of the tape 6 caused by such design errors The error is the adjustment screw 45.55
It is also possible to make these adjustments while actually running the tape 3. From this, it is possible to make the following adjustments: Even if the tape winding diameter changes sequentially, the tension of the tape 3 can be set to a substantially uniform and appropriate value.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to set a substantially uniform and appropriate tape tension while running the tape simply by adjusting the adjustment screw, regardless of the winding diameter of the tape on the tape reel. The adjustment method is simple, high adjustment accuracy can be obtained, and the rotation range of the rotation member can be reduced, reducing the space required for rotation and making it more compact. , it is possible to provide a tape tension servo device with excellent functions except for the drawbacks of the above-mentioned prior art.

[Brief explanation of drawings]

Fig. 1 is a plan view showing an example of a tape running system of a video tape recorder, Fig. 2 is a plan view showing an example of a conventional tape tension servo device, Fig. 6 is a side view thereof, and Fig. 4 is a plan view showing an example of a conventional tape tension servo device. FIG. 5 is a plan view showing an embodiment of the tape tension servo device, and FIG. 5 is a side view thereof. 1...Chassis, 1'...Chassis side wall, 3...
Tape, 4... Supply reel, 6... Tension detection member, 10... Tension ball, 18... Spring, 26... Reel base winding part, 27... Tension band, 64... - Operating member, 67... straight part, 3
8...Kuhomi part, 40...Tension adjustment arm,
41... Pin, 42... Step part, 43... Projection part,
44...Bending part, 45...Adjusting screw, 46...Control member, 47.49...Pin, 50...Bending part, 5
2...Spring, 54...Bending portion, 55...Adjustment screw.

Claims (1)

[Claims] an actuation member slidable between a first position and a second position;
A tension detection member that is biased by a first elastic member and rotates according to the tape tension, and one end of which is held by the tension detection member and comes into contact with the reel base winding portion to rotate the tension detection member. and a tension band that applies a braking force to the reel base winding portion according to the
By sliding the actuating member to the first position,
The tension band applies a braking force to the reel base winding portion according to the rotation of the tension detection member to apply tension to the tape, and the actuation member slides to the second position, In the tape tension servo device ft, the tension band is released from the reel base winding portion, and the control unit holds the other end of the tension band and allows the tension band to rotate by being biased by a second elastic member. a first adjustment screw for adjusting the rotation range of the control member, and a second adjustment screw for adjusting the tension of the first elastic member; By sliding the tension band to the first position, the tension band is brought into contact with the winding part of the reel base, and by sliding the actuating member to the second position, the tension band is brought into contact with the winding part of the reel base. The tape tension can be adjusted using the first and second adjusting screws.
#4 A tape tension servo device featuring the following features: