JPH054107Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a tape tensioning mechanism in a novel tape running device. Specifically, it relates to a tape tensioning mechanism for maintaining the tension of the running tape in a tape running device such as a video tape recorder (hereinafter referred to as "VTR"), and when the tape is running at a constant speed. A tension gear arm for applying a predetermined tension to the tape is locked in a predetermined position when the tape is running at high speed,
As a result, the ten leg pin becomes a tape guide post for regulating the tape path fixedly placed at a predetermined position, and in this state, by releasing the braking force on the reel stand, it is possible to A new tape running device that can keep the tape running state and tape path in a desirable state even in the tape running mode, makes the tape running device and tape cassette less likely to break down, and can be made more compact. The present invention aims to provide a tape tensioning mechanism for

Background technology and its problems For example, in the tape running device of a VTR,
At least in the playback (FWD) mode and the recording (REC) mode, the tape must be run with a constant tension maintained at all times. For this reason, VTR tape running devices generally
Gives an appropriate tension to the tape while it is running,
Further, a tape tensioning mechanism is provided which includes an automatic adjustment means for automatically adjusting the tape tension to an appropriate value when the tape tension is changed.

FIG. 6 shows an example of a conventional tape tensioning mechanism in a VTR tape running device.

In Fig. 6, a is the supply side reel stand (hereinafter referred to as
It's called the "S side reel stand." ) and b are winding-side reel stands (hereinafter referred to as "T-side reel stands"), and these reel stands a and b are rotatably supported by the chassis section. c, c' are each reel stand a,
b is an engagement shaft provided at the upper part, and d is a brake drum portion integrally formed at the lower part of the S-side reel stand a.

Denoted at e is a balance gear arm, one end of which is rotatably supported by a support shaft f extending upright from the chassis, and a balance gear pin g erected at the other end, that is, the swinging end. h is a tension spring whose one end is fixed to the chassis part and the other end is connected to the above-mentioned balance gear arm e, and the tension gear arm e is caused by the tensile force of this tension spring h.
A rotational force is always applied to rotate the reel toward the reel stand a side, which is opposite to the s side. i is a brake band, one end of which is connected to the tension pin g from the position where this of the tension gear arm e is supported by the support shaft f.
The other end is connected to a band fixing member j provided on the chassis part, and the intermediate part is connected to the outer peripheral surface of the brake drum part d formed on the S side reel stand a. wrapped around it. As a result, the pressing force of the brake band i against the brake drum part d is weakened by the rotation of the ten leg gear arm e towards the S side reel stand a, thereby reducing the frictional force between the brake band i and the brake drum part d. As a result, the braking force applied to the brake drum portion d is weakened.
Furthermore, by rotating the ten leg gear arm e toward the side opposite to the S reel stand a, the pressure contact force against the brake drum portion d is strengthened, thereby increasing the frictional force with the brake drum portion d.
The braking force applied to the brake drum portion d becomes stronger.

K is a tape cassette in which a supply tape reel (hereinafter referred to as "S reel") L and a take-up tape reel (hereinafter referred to as "T reel") M are rotatably installed. It is stored,
One end of tape n is wound around S reel l,
The other end is wound around a T-reel m.

When the tape cassette k is loaded into the VTR, the S reel l and the T reel m are moved to the reel stand a.
The reel stands a, b are engaged with the engagement shafts c, c' of the reel stands a, b.
It is made to rotate integrally with the At the same time, the tape n is pulled out from the tape cassette k by a tape loading mechanism (not shown) provided in the VTR, and is pulled out from the tape cassette k to the first tape guide post o.
The tape is set to pass through a predetermined path by being wound around or in contact with other tape guide posts (not shown) or various heads.

And when in FWD mode and REC mode,
The tensile gear arm e is brought to the position shown by the solid line in FIG. At this time, the tape n is made to pass through a tape path approximately as shown by the thick two-dot chain line in FIG. However, when in FWD mode and
In the REC mode, the tape n is sandwiched between a capstan and a pinch roller (not shown) and run at a constant speed, and is pulled out from the S reel l and wound onto the T reel m.

As a result, the tension pin g imparts an appropriate tension to the tape n that is run as described above.

In other words, approximately the middle part of the tape n between the S reel l and the position where it is wound around the first guide post o is pulled toward the opposite side of the S reel l by the tensile pin g with an appropriate tensile force. This will give the tape n the proper tension as it will be pulled towards the end. When the proper tension given to the tape n in this way is increased to more than the warpage or lowered to less than that for some reason, the tensile gear arm e is adjusted to a predetermined value according to the changed tension. As a result, as mentioned above, the braking force of the brake band i on the brake drum portion d of the S-side reel stand a is adjusted, and thus the braking force of the brake band i on the brake drum part d of the S-side reel stand a is adjusted. The rotational resistance is adjusted so that the tape n
The tension will be automatically adjusted.

In the tape fast forward (FF) mode and the tape rewind (REW) mode, the tension gear arm e is brought to the position shown by the two-dot chain line in FIG. 6. This is because in FF mode and
In the REW mode, both the S-side reel stand a and the T-side reel stand b are rotated at high speed, so the S-side reel stand a is rotated by the brake band i.
This is because it is necessary to ensure that the braking force against is zero.

Incidentally, there is an increasing demand for smaller VTRs and the tape cassettes used therein. Therefore, for example, in a tape cassette, it may be possible to omit the tape guide post in the tape cassette, thereby reducing the size of the tape cassette. For this purpose, the tape cassette k shown in FIG. 6 does not have a tape guide post inside the cassette.

However, if the tape guide post is omitted from the tape cassette, a problem arises in relation to the tape running device of the VTR. In other words, if the tape guide post is omitted from the tape cassette, this tape cassette can be used as a VTR.
The tape path when the tape is installed is such that there is no member regulating the tape path between the S reel l and the ten leg pin g. Moreover,
As mentioned above, the tensile pin g is placed at the position shown by the two-dot chain line in Fig. 6 in the FF mode and the REW mode, so the S reel l and There is no member for regulating the tape path between it and the first tape guide post o of the VTR. Therefore, in such a tape path state, as the winding diameter of the tape n on the S reel l becomes smaller, the connection between the first tape guide post o and the tape outlet p on the S reel l side of the tape cassette k becomes smaller. Depending on the positional relationship, the tape n may come into contact with both sides of the tape outlet p.

As described above, if the tape n is run at high speed while being in contact with the side surface of the tape outlet p of the tape cassette k, a considerable amount of frictional heat will be generated on the tape n, and there is a risk that the tape n will be seriously damaged. There is.

Therefore, if the tape guide post is omitted from the tape cassette, it becomes necessary to newly provide another tape guide post in the tape running device of the VTR. i.e. at least
A predetermined position where the tape path between the S reel l and the first tape guide post o does not come into contact with the side surface of the tape outlet p of the tape cassette k in the FF mode and the REW mode. It is necessary to provide a tape guide post located at the

However, such a tape guide post
When the tape cassette k is loaded into the VTR, it must be located in the tape draw-out recess q of the tape cassette k, and when the tape n is loaded, it must be brought to the above-mentioned predetermined position. Therefore, such a tape guide post needs to be supported by a guide movement mechanism that moves between two predetermined positions at a predetermined timing. Needless to say, such a guide movement mechanism has a complicated structure, so in the end,
This results in the tape running device becoming complicated and large in size. In this case, there is no point in trying to miniaturize the tape cassette or VTR at the same time, and it may even lead to the VTR being made larger.

Therefore, when the tape guide post is omitted from the tape cassette, in the FF mode and the REW mode, the ten leg pin g should be placed at a position where the tape path between the S reel l and the first tape guide post o can be regulated, i.e. , S reel l of tape n
It is also conceivable to move the tape to a position where the tape path can be regulated so that the tape n does not come into contact with the side surface of the tape outlet p of the tape cassette k even if the winding diameter of the tape is reduced. However, if the tension pin g is placed in such a position, the braking force of the brake band i on the brake drum portion d may not be completely reduced to zero, or the tension pin may be affected by the tape n running at high speed. By violently shaking g, the tensile gear arm e
is rotated toward the side opposite to the S-side reel stand a, which poses a problem in that there is a risk that the brakes will be applied to the S-side reel stand a. Furthermore, if the ten-legging pin g is shaken violently, there is a problem in that the tape n is not evenly wound onto the S reel l in the REW mode.

In addition to the above-mentioned problems, in FF mode and REW mode, the S reel l and the first
If there is no member to regulate the tape path between the tape guide post o and the first tape guide post o, as the winding diameter of the tape n on the S reel l changes, the winding angle of the tape n on the first tape guide post o will increase. As the contact resistance between the tape n and the first guide post o changes, the contact resistance between the tape n and the first guide post o changes. As a result, the running resistance etc. of the tape n are changed, so that there is a problem that the running state of the tape n is not constant and becomes extremely unstable.

Purpose of the invention Therefore, the present invention was devised in view of the above-mentioned problems.The invention locks the tension arm, which applies a predetermined tension to the tape, in a predetermined position when the tape is running at high speed, thereby increasing the tension of the tension pin. In addition to serving as a tape guide post for regulating the tape path that is fixedly placed at a predetermined position, by releasing the braking force on the reel stand in that state, it can be used in any tape running mode. A tape tensioning mechanism in a new tape running device that can achieve desirable tape running conditions and tape paths, make the tape running device, tape cassette, etc. less likely to break down, and can be made more compact. The purpose is to provide

Summary of the invention In order to achieve the above-mentioned purpose, the tape tensioning mechanism in the tape running device of the present invention is a tape tensioning mechanism in a tape running device that does not have a member for regulating the tape path between the supply side tape reel and the ten leg pin. , a reel stand that rotates integrally with the supply tape reel, and a ten-leg gear arm that is rotatably supported by the chassis and has a ten-leg gear pin upright at its swinging end around which the tape pulled out from the supply-side tape reel is wound. a brake band having one end fixed to the ten leg gear arm and a middle part wrapped around the brake drum of the reel stand, and the other end of the brake band being fixed and rotatably supported on the support shaft of the reel stand. The device includes a band fixing member, a locking means for locking the tension gear arm, and a brake release means, and the tension gear arm is locked in a predetermined position by the locking means at least in tape fast forward mode and tape rewind mode. The tensile pin serves as a tape guide post fixedly placed at a predetermined position, and the direction in which the brake band is loosened when the band fixing member is moved to the brake release position by the brake release means is the brake drum. It is characterized in that the direction is tangential to .

Embodiments Below, details of the tape tensioning mechanism in the tape running device of the present invention will be explained according to embodiments shown in the accompanying drawings. In the embodiment shown in the drawings, the tape tensioning mechanism in the tape running device of the present invention is applied as the tape tensioning mechanism 1 in the tape running device of a VTR.

In the drawing, 2 is the reel stand on the supply side (hereinafter referred to as
It's called the "S side reel stand." ) (see Figure 4),
The A-side reel stand 2 is rotatably supported by a reel stand support shaft 4 erected from the chassis portion 3.
5 is a brake drum part formed at the lower end of the reel stand 2, 6 is a gear part formed on the upper side of the brake drum part 5, and 7 is a reel mounting part formed further above the brake drum part 5. The part 5, the gear part 6, and the reel mounting part 7 are arranged coaxially with each other and are integrally formed. 8 is a reel engaging shaft provided at the upper end of the reel stand 2;
It is engaged with a tape reel on the supply side, which will be described later.

Although not shown, the right side of the upper surface of the chassis section 3 from the position where the S-side reel stand 2 is located (the right direction in FIG. 1 is the right direction, and the left direction is the right direction in FIG. 1). In addition, the downward direction in FIG. 1 is defined as the front side, and the upward direction is defined as the rear side. In the above explanation, directions are referred to in this direction.)
A take-up side reel stand (hereinafter referred to as "T
"Side reel stand." ) are placed.

Therefore, the S-side reel stand 2 and the T-side reel stand are adapted to the tape running mode by meshing a drive gear (not shown) with the gear portion 6 of either one of them depending on the predetermined tape running mode. It is made to rotate at a certain speed.

Reference numeral 9 denotes a ten leg gear arm arranged at a position slightly to the left from the rear of the S-side reel stand 2. The tensile gear arm 9 is formed to be bent in a substantially dogleg shape as a whole when viewed from above, and the support portion 10 formed at the front end thereof is formed into a substantially daruma shape when viewed from above. There is.

Reference numeral 11 denotes a balance pin that is erected at the rear end of the balance gear arm 9, that is, at the swinging end. The balance gear pin 11 is a shaft 12 that is erected from the balance gear arm 9.
a sleeve 13 fitted externally to the lower part of the shaft 12; a cap part 14 fitted externally in a press-fitted manner to the upper end of the shaft 12;
The roller part 15 is disposed between the sleeve 13 and the cap part 14, and is rotatably fitted onto the shaft 12. In addition, the roller part 15
A magnetic tape, which will be described later, is wound around it. 16 is the support part 1 of the tensile gear arm 9
This is a boss portion formed to protrude downward from the lower surface of the rear end of 0, and the boss portion 16 has an insertion hole 17.
is formed.

Reference numeral 18 designates a thrust receiving member which is formed into a substantially oval planar shape, and holes 19 and 20 are formed at substantially the center and at positions near the front end. 21 is the above-mentioned balance gear arm 9 and thrust receiving member 18
The upper part 21a is formed with a large diameter, the lower part 21b is formed with a small diameter, and a head 21c is formed with a groove in which the tip of a screwdriver is engaged at the upper end. It is formed. A screw groove is formed on the outer peripheral surface of the upper part of the adjustment shaft 21.

The lower portion 21b of the adjustment shaft 21 serves as a lock pin for locking the balance gear arm 9 at a predetermined position by a mode display lever to be described later.

22 is a guide hole formed approximately in the center of the support part 10 of the balance gear arm 9; 23 is a guide hole formed in the support part 10 of the balance gear arm 9;
This is a mounting hole formed near the rear end of the 0. Reference numeral 24 denotes a metal sleeve that is press-fitted into the mounting hole 23, and the lower part of the inner circumferential surface of the metal sleeve 24 has a somewhat smaller diameter than the upper part, and has a threaded groove formed therein. There is.

Reference numeral 25 denotes a guide shaft, the portion of which is closer to the upper end is formed to have a larger diameter. Further, 26 is a telescope arm support shaft erected from a predetermined position of the chassis portion 3.

Thus, the upper end of the guide shaft 25 passes through the hole 19 formed in the center of the thrust receiving member 18, and the portion protruding upward from the hole 19 is caulked so that the guide shaft 25 extends downwardly from the thrust receiving member 18. It is attached so that it protrudes from the The guide shaft 25 is the support part 1 of the tensile gear arm 9.
The adjustment shaft 21 is slidably inserted into the guide hole 22 formed in the thrust receiving member 1.
It is inserted into the hole 20 on the front side of 8 from above, and
The upper portion 21a is screwed into the threaded portion of the metal sleeve 24. In addition, 27 is the adjustment shaft 21
The coil spring 27 is a coil spring fitted onto the upper part 21a of the metal sleeve 24, and the coil spring 27 is compressed to some extent and placed between the lower surface of the thrust receiving member 18 and a step formed in the middle part of the metal sleeve 24. There is.

In this state, the entire lock pin 21b of the adjustment shaft 21 is made to protrude downward from the metal sleeve 24.

As described above, the thrust receiving member 18 is connected to the balance gear arm 9 via the adjustment shaft 21,
Further, it is arranged at a certain distance upward from the upper surface of the support part 10 of the balance gear arm 9, and its rear end is arranged opposite to the upper opening of the through hole 17 formed in the boss part 16 of the balance gear arm 9. be done.

When the balance gear arm support shaft 26 is inserted into the insertion hole 17 of the balance gear arm 9, the upper end of the balance gear arm support shaft 26 projects upward from the insertion hole 17, and its top surface meets the lower surface of the thrust receiving member 18. be brought into contact. Therefore, the balance gear arm 9 is connected to the balance gear arm support shaft 2.
6, and the load in the thrust direction is received by the portion where the lower surface of the thrust receiving member 18 and the top surface of the telescope arm support shaft 26 come into contact.

In addition, in the state where the balance gear arm 9 is supported by the balance gear arm support shaft 26 as described above,
The height from the chassis portion 3 is adjusted by appropriately rotating the adjustment shaft 21.

Reference numeral 28 denotes a falling-off prevention plate, which is made of a plate spring material, and its tip is connected to the upper surface of the thrust receiving member 18 by the tensile gear arm support shaft 26.
The thrust receiving member 18 is arranged at a position corresponding to the portion contacted from below and slightly spaced apart from the thrust receiving member 18.

29 is a tension spring. One end of the tension spring 29 is attached to a position near the front end of the tension gear arm 9, and the other end is attached to the chassis portion 3. Therefore, the tensile gear arm 9 is always biased with a rotational force in the counterclockwise direction in FIG. 1 by the tensile force of the tension spring 29.

Incidentally, when the magnetic tape is not being loaded, the tensile gear arm 9 is held at a position as shown by the two-dot chain line in FIG.

30 is a brake band. The brake band 30 is formed of a thin piece of phosphor bronze into a substantially band shape, and a brake shoe 31 made of a material such as felt is integrally attached to one side of the band, leaving both ends intact.

Reference numeral 32 designates one band connecting member attached to one end of the brake band 30. Reference numeral 33 denotes a connecting pin integrally formed so as to protrude downward from one end of the band connecting member 32. Reference numeral 34 denotes a retaining protrusion placed a little apart from the connecting pin 33, and has a locking claw protruding toward the connecting pin 33 at its lower end. 35, 35 is a band connecting member 32
This is a pin that protrudes laterally from one side of the other end. Further, 36 is a holding piece, and the mounting hole 3
7,37 are formed. Therefore, the pins 35 and 3 of the band connecting member 32 are inserted into the mounting holes (not shown) formed at one end of the brake band 30.
5 is inserted, and in that state, the mounting hole 3 of the presser piece 36 is inserted.
The pins 35, 35 are inserted through the holes 37, 37 for the holding pieces 36 of the pins 35, 35,
The part protruding from 37 is caulked. As a result, one of the band connecting members 32 is integrally attached to one end of the brake band 30.

38 is the other band connecting member attached to the other end of the brake band 30 (see FIG. 3). One end of the band connecting member 38 is formed into a substantially circular shape when viewed from above, and a connecting hole 39 is formed in the center thereof, and a long hole 40 is formed at a position closer to the other end. Reference numerals 41 and 41 indicate pins projecting laterally from one side of the band connecting member 38. Further, 42 is a presser piece,
Attachment holes 43, 43 are formed. However,
The pins 41, 41 of the band connecting member 38 are inserted into holes (not shown) formed at the other end of the brake band 30, and in this state, the pins 41, 41 are inserted into the mounting holes 43, 43 formed in the holding piece 42. While being inserted, the portions of the pins 41, 41 that protrude from the mounting holes 43, 43 of the holding pieces 42 are caulked.
As a result, the other band connecting member 38 is integrally attached to the other end of the brake band 30.

Thus, the connecting pin 33 of one band connecting member 32 is inserted into a connecting hole 44a formed in a projecting piece 44 that is formed to project laterally from one side of the brake arm 9, and The locking claw of the protrusion 34 for preventing it from coming off is the protrusion part 44.
By being locked to the lower side edge of the brake arm 9, the brake arm 9 is rotatably connected to the brake arm 9, and the connected state is maintained.

45 is a band fixing member (see FIG. 3).
This band fixing member 45 is connected to the other band connecting member 38 described above, and is a member for fixedly holding the other end of the brake band 30 at a predetermined position in a predetermined tape running mode. . Reference numeral 46 designates the base of the band fixing member 45, and a boss 47 is integrally formed in a raised shape approximately at the center of the right side portion of the base, and an insertion hole 48 is formed in the boss 47. The left side of the base 46 is formed into a substantially triangular shape when viewed from above, and the protruding piece 4 extends from the upper edge of the side facing forward.
9 is formed to protrude substantially horizontally. 50 is a rising portion 5 from the left end of the base 46.
This is a connecting portion integrally formed via Oa. 5
Reference numeral 1 denotes a connecting pin erected from the tip of the connecting portion 50, and numeral 52 denotes a positioning pin erected from approximately the center of the connecting portion 50. Reference numeral 53 designates a retaining protrusion that stands upright from the side edge of the connecting portion 50 on the side of the base 46, and has a locking pawl formed at its upper end. Reference numeral 54 denotes a spring holding piece that stands upright from the outer peripheral edge of the right side portion of the base 46, and its upper end is attached to the boss 4.
It is formed to be bent toward the 7 side. Further, 55 is the connecting portion 5 of the left side portion of the base 46.
This is a press-fit hole formed at a position close to the position where 0 is formed, and the stopper pin 5 is inserted into the press-fit hole 55.
The upper end of 6 is press-fitted.

The band fixing member 45 is inserted into its insertion hole 48.
By inserting the reel stand support shaft 4 described above, it is rotatably supported by the reel stand support shaft 4.

Further, the other band connecting member 38 described above has a connecting hole 39 through which the connecting pin 51 of the band fixing member 45 is inserted, and a positioning pin 52 through the elongated hole 40 so that the other band connecting member 38 becomes a band securing member. 45, and the band fixing member 45 is attached to one side edge of the upper surface of the band connecting member 38.
The locking claw of the projection piece 53 for preventing the band from coming off is locked, thereby preventing the band from coming off from the band fixing member 45.

Thus, one end of the brake band 30 is connected to the balance gear arm 9 via one of the band connecting members 32, and the other end is fixed to the band fixing member 45 via the other band connecting member 38. The intermediate portion thereof is wound around the outer peripheral surface of the brake drum portion 5 of the S-side reel stand 2 by approximately three-fourths of the circumference.

57 is a torsion spring. The ring-shaped intermediate portion 57a of the torsion spring 57 is fitted onto the boss 47 of the band fixing member 45, and the tip of one arm 57b is brought into elastic contact with a pin 58 erected from the chassis portion from the right side. Further, the tip of the other arm 57c is arranged in elastic contact with the side surface of the left side portion of the band fixing member 45 on the side where the protruding piece 49 is formed. The torsion spring 57 arranged in this way is positioned at a position by the protruding piece 49 formed on the band fixing member 45, the spring holding piece 54, and the flange formed at the upper end of the pin 58. It is intended to be retained.

As the other arm 57c of the torsion spring 57 is in elastic contact with one side of the band fixing member 45, the band fixing member 45 is always biased with rotational force in the clockwise direction in FIG. , the lower end of the stopper pin 56 is connected to the chassis portion 3.
By coming into contact with a stopper portion (not shown) formed in the holder, the holder is maintained at the position shown in FIG. 1 (hereinafter referred to as the "fixed position").

The other arm 57c of the torsion spring 57 comes into light elastic contact with the upper surface of the base 46 of the band fixing member 45, so that the band fixing member 45 is in a state where it is lightly pressed against the upper surface of the chassis portion 3. be done. Therefore, there is no fear that the band fixing member 45 will float upward.

59 is a tape cassette, which includes a supply side tape reel (hereinafter referred to as "S reel") 60 and a take-up side tape reel (hereinafter referred to as "T reel"), not shown.
Say. ) are rotatably stored. 61
is one tape outlet formed at the left end of the front surface of the tape cassette 59, and although not shown, there is another similar tape outlet formed at the right end of the front surface of the tape cassette 59. is formed. Reference numeral 62 denotes a recess formed on the front surface of the tape cassette 59 for drawing out the tape. 63 is a magnetic tape.

Then, the magnetic tape 63 is inserted into the tape cassette 5.
When 9 is not in use, S reel 6
0 to the outside of the tape cassette 59 through one tape outlet 61, passes through the front side of a tape draw-out recess 62 to the other tape outlet (not shown), and is introduced into the tape cassette 59 from there to the tape cassette 59 (not shown). It is passed through a tape path that appears to be wound onto a T-reel.

Then, when the tape cassette 59 is attached to the VTR and a tape loading operation is started, the magnetic tape 63 is pulled out from the tape cassette 59, and the magnetic tape 63 is pulled out from the tape cassette 59 and the first tape guide post 64 provided on the VTR and other parts (not shown) The tape is wound around a large number of tape guide posts, and is set to pass through a predetermined tape path while being wound around or in contact with various heads (not shown). At the same time, when the tape loading operation is started, the ten-leg gear arm 9 held at the position shown by the two-dot chain line in FIG. 1 is rotated counterclockwise, and the magnetic tape 6 is
3 S reel 60 and first tape guide post 6
4 is pulled toward the left by a tensile pin 11. As a result, the tape path is formed in a substantially dogleg shape in the portion between the S reel 60 of the magnetic tape 63 and the first tape guide post 64.

In this manner, the portion of the magnetic tape 63 that is wound around the ten-leg pin 11 is pulled toward the left, thereby being given an appropriate tension.

In the FWD mode or the REC mode, the magnetic tape 63 is sandwiched between a camp stamp and a pinch roller (not shown) and run at a constant speed, and is pulled out from the S reel 60 and wound onto a T reel (not shown). It will be taken away.

If the tension of the magnetic tape 63 that is being run in this way is changed for some reason, the tension pin 11 will be moved by the tensile force caused by the proper tape tension and the tension spring 29 that was previously applied to the tension gear arm 9. It will be moved from the position where the rotational force due to the pulling force is balanced. The direction in which this tensile gear pin 11 is moved is clockwise in FIG. When the tension becomes low, the rotational force of the tension gear arm 9 is superior to the tensile force of the tape tension, so that the rotational force becomes counterclockwise in FIG. 1.

Therefore, when the tape tension becomes high, the tensile gear arm 9 is rotated clockwise, that is, toward the S-side reel 2, so that the force pulling the brake band 30 is weakened. That is, the frictional resistance between the brake shoe 31 and the brake drum 5 is weakened. As a result, the braking force exerted by the brake band 30 on the brake drum portion 5 is weakened. As a result, the rotational resistance of the S-side reel stand 2 and the S reel 60 is reduced, so that the tension of the magnetic tape 63 is reduced.

Conversely, when the tape tension becomes low, the braking force exerted by the brake band 30 on the brake drum portion 5 is increased due to the opposite effect to that described above. As a result, the rotational resistance of the S-side reel stand and the S reel 60 is increased, so that the tension of the magnetic tape 63 is increased.

Adjustment of the tape tension by the tensile gear arm 9, the tensile gear pin 11, the brake band 30, etc. is performed as described above, and thereby the tension of the running magnetic tape 63 is automatically adjusted.

In the FF mode and the REW mode, the balance gear arm 9 is in a position as shown in FIG. 2 (hereinafter, this position is referred to as the "lock position").
It becomes locked. At the same time, the band fixing member 45 is moved to the position shown in FIG. Therefore, the braking force on the brake drum portion 5 of the S-side reel stand 2 becomes zero.

Next, the means for locking the balance gear arm 9 in the lock position and the means for moving the band fixing member 45 to the brake release position will be explained.

Reference numeral 65 denotes a mode display lever formed into a substantially elongated plate shape, and is located at a position where it passes through a portion of the upper surface of the chassis portion 3 corresponding to between the S side reel stand 2 and the ten leg gear arm 9, and its longitudinal direction is It is arranged so as to extend along the left-right direction, and is arranged so as to be movable in the left-right direction. 66,66
is a guide notch formed to extend in the longitudinal direction near the front edge of the mode revealing lever 65, and guide pins 67, 67 (shown in the drawing) are provided upright from the chassis portion 3 in the guide notches 66, 66. (Only the one that corresponds to one guide notch is shown here.)
are slidably engaged, and the mode revealing lever 65 is engaged with the guide notches 66, 66 and the guide pin 6.
7 and 67 to guide its movement direction. Reference numeral 68 denotes a guide groove formed to extend substantially along the longitudinal direction at a position near the rear edge of the mode revealing lever 65, and a portion near the left end of the guide groove 68 to the right side extends upward. It is bent into a substantially mountain shape when viewed from above. And the ten leg gear arm 9
The lock pin 21b provided in the adjustment shaft 2
1 is arranged so as to engage with the guide groove 68 of the mode revealing lever 65. Reference numeral 69 denotes a pressing ridge formed along the left end of the front edge of the mode revealing lever 65.

Although not shown, a rack is formed on the mode presentation lever 65, and the rack is engaged with a drive gear (not shown) that is driven in accordance with a mode selection command. Further, the mode revealing lever 65 is formed with a number of portions having a cam function such as notches, recesses, or protrusions (not shown).
The mode display lever 65 is moved in a predetermined direction by a predetermined amount by a drive gear and rack (not shown) that are driven in response to a predetermined mode selection command. By moving the lever 65 in this manner, predetermined ones of the various members constituting the tape running device and the members constituting the tape tensioning mechanism 1 are brought into the state they should be in the mode. It is being done.

70 is a pressing lever. The pressing lever 70 is arranged along the front edge of the mode revealing lever 65, and its left end is connected to the chassis portion 3.
It is rotatably supported by a pin 71 protruding from the top. Reference numeral 72 denotes a pressed portion that is formed to protrude rearward from a substantially central portion in the left-right direction of a portion of the rear surface of the pressing lever 70 near the upper surface; 65
It is arranged so as to face above the front part of the upper surface of. Further, 73 is a pressing portion that is integrally formed so as to protrude forward from the right end of the front side of the pressing lever 70, and the front end of the pressing portion 73 has a lower half portion 73a and an upper half portion 73b. The upper half 73b projects further forward than the lower half 73a. Then, the lower half 73 of the pressing part 73
The distal end surface of a is a curved surface, and is arranged so as to be slightly spaced apart from and opposite to the rear surface of the left side portion of the base 46 of the band fixing member 45. In addition, the upper half part 73b of the pressing part 73 is arranged so as to face above the band fixing member 45.

Thus, in the FF mode and the REW mode, the mode revealing lever 65 is moved from the position shown in FIG. 1 to the position shown in FIG. 2. Then, the lock pin 21b provided on the balance gear arm 9 is engaged with the left end of the guide groove 68 provided on the mode revealing lever 65. When the lock pin 21b is in this state, the balance gear arm 9 is in a locked state at the position shown in FIG. That is, even if a rotational force is applied to the tension gear arm 9 in the clockwise direction in this state, the lock pin 21b is only pressed against the left end surface of the guide groove 68 and cannot move from that position. This is because even if a counterclockwise rotational force is applied to the balance gear arm 9, the lock pin 21b is only pressed against the rear end surface of the guide groove 68 and cannot move from its position. Therefore, the tensile gear arm 9 is
Movement from the position shown in the figure is prevented.

The position where the balance pin 11 comes when the balance gear arm 9 is locked in this manner is such that the portion of the magnetic tape 63 that passes through one tape outlet 61 of the tape cassette 59 is located at the position where the magnetic tape 63 is wound onto the S reel 60. This position allows the tape to pass through a path that does not come into contact with the side surface of the tape outlet 61 even when the diameter is at its minimum. That is, the position at which the balance gear arm 9 is locked is such that the balance gear pin 11 can come to the above-mentioned position.

Then, at the same time as the balance gear arm 9 is locked in a predetermined position in this manner, the band fixing member 45 is moved toward the brake release position. That is, when the mode revealing lever 65 is moved to the above-described position, the pressing protrusion 69 presses the pressed portion 72 formed on the pressing lever 70.
2, so that the pressing lever 70 is rotated toward the position shown in FIG. 2. When the pressing lever 70 is rotated in this manner, the tip end surface of the lower half 73a of the pressing portion 73 is brought into contact with the band fixing member 45, and the band fixing member 45 is pressed. . Therefore, the band fixing member 45 is rotated counterclockwise against the elastic force of the torsion spring 57. Thus, the band fixing member 45 is moved to the brake release position shown in FIG.

In this way, when the band fixing member 45 is moved to the brake release position, the other end of the brake band 30 is moved toward the side opposite to the tension gear arm 9, so that the brake band 30 is attached to the brake drum part of the S-side reel stand 2. 5, no pressing force is applied at all. That is, the brake band 30 is loosened. In addition, in the state where the brake band 30 is loosened in this way, the brake shoe 31 is not necessarily separated from the brake drum part 5 in all its parts, but the brake shoe 31 is not necessarily separated from the brake drum part 5. Since there is no state in which a pressing force is exerted on the brake drum portion 5, the braking force on the brake drum portion 5 is set to zero.

Therefore, in the FF mode and the REW mode, the ten-leg pin 11 becomes a tape guide post that is fixedly placed at a predetermined position for regulating the tape path of the magnetic tape 63. Thus, magnetic tape 63 is caused to run through a desired tape path.

Note that when the band fixing member 45 is moved to the brake release position as described above, the direction in which the brake band 30 is loosened is in the direction of the brake drum portion 5.
is considered to be the tangential direction. This is because the band fixing member 45 is rotatably supported by the reel stand support shaft 4 on which the S side reel stand 2 is supported, and the other end of the brake band 30 is attached to the outer peripheral surface of the brake drum part 5. Since it is fixed to the band fixing member 45 at a position corresponding to a position slightly outward from the band fixing member 45, when the band fixing member 45 is rotated,
This is because the other end of the brake band 30 can be moved substantially along the outer peripheral surface of the brake drum section 5. If the direction in which the brake band 30 is loosened is such a direction, there is no risk that the force applied to the brake band 30 to loosen it will deform the brake band 30.

Note that 74 is a band guide (not shown in FIG. 2) that is arranged to surround part of the brake drum section 5 and gear section 6 of the S-side reel stand 2 from the outside. This band guide 7
4 protects the brake band 30, and when the brake band 30 is loosened as described above, if the direction of loosening is not the direction as described above for some reason, the brake band 30 may be This is to guide the direction in which it is loosened so that it does not come into contact with other members.

Effects of the invention As is clear from the above description, the tape tensioning mechanism in the tape running device of the invention is as follows:
In a tape tensioning mechanism in a tape running device that does not have a member that regulates the tape path between the supply tape reel and the ten-leg pin, a reel stand that rotates integrally with the supply tape reel and a chassis part that is rotatably mounted. a ten-leg gear arm that is supported and has a erected ten-leg pin on its swinging end around which the tape pulled out from the supply side tape reel is wound; and a brake band that has one end fixed to the ten-leg gear arm and whose middle part is wound around the brake drum of the reel stand. , comprising a band fixing member to which the other end of the brake band is fixed and rotatably supported by the support shaft of the reel stand, locking means for locking the ten-leg gear arm, and brake release means; At least in the tape fast-forward mode and the tape rewind mode, the ten-leg gear arm is locked in a predetermined position by the locking means, so that the ten-leg gear pin becomes a tape guide post fixedly disposed at a predetermined position; The present invention is characterized in that the direction in which the brake band is loosened when the band fixing member is moved to the brake release position by the brake release means is the tangential direction of the brake drum.

That is, in the present invention, one pin member is used as a tension pin to apply a predetermined tension to the running tape in FWD mode or REC mode, and to regulate the tape path in FF mode or REW mode. It is designed to be used as a tape guide post for

Therefore, in the FWD mode or the REC mode, an appropriate tension can be applied to the tape running at a constant speed by the tension pin. And in FF mode or REW mode,
If the tensile gear arm is locked when the tensile gear pin supported by it comes to a position that regulates the tape path between the S reel and the first tape guide post, the connection between the S reel of the tape and the first tape guide post can be prevented. The portions in between can be run through a predetermined tape path.

Therefore, even if the tape guide post of the tape cassette is omitted, the tape will not come into contact with the side of the tape outlet of the tape cassette, and the tape will always run in good condition.

In the present invention, when the tension gear arm is locked at the position where the tension gear pin regulates the tape path between the S reel and the first tape guide post, the end of the brake band on the side opposite to the tension gear arm is fixed. Since the band fixing member is moved in the direction of releasing the braking force exerted by the brake band on the brake drum section of the S side reel stand, in FF mode or REW mode, the brake band does not exert any force on the S side reel stand. Brake force can be completely reduced to zero.

According to the present invention, the tape running state and the tape path can be maintained in a desired state in any tape running mode without providing a specific member for regulating the tape path between the S reel and the ten leg pin. In addition, it is possible to provide a novel tape cassette in which the tape running device, tape cassette, etc. can be made more compact.

Furthermore, in the present invention, the direction in which the brake band is loosened when the band fixing member is moved is the tangential direction of the brake drum. Since no force is applied in a direction that would deform the brake band, there is no risk of bending the brake band. Therefore, a soft material that can be evenly wrapped around the brake drum of the reel stand can be used as the material for the brake band.

In the present invention, the band fixing member is rotatably supported on the shaft on which the S side reel stand is supported, so that the direction in which the brake band is loosened can be reliably set in the tangential direction of the brake drum. It can be done.

In the above-mentioned embodiment, the locking means for locking the balance gear arm at a predetermined position in the FF mode and the REW mode and the brake release means were constituted by one mode lever. By doing so, the tape tensioning mechanism of the present invention can be made more compact, and the locking of the tension arm and the release of the brake can be reliably synchronized.

Furthermore, in the above-described embodiment, the elastic means is used as a means for holding the band fixing member in a predetermined position when fixing, but by doing so, the band fixing member is held at a predetermined position when fixing. It can be reliably held in a predetermined position, and can be easily moved when moving, and if for some reason the ten-leg gear arm is forced to rotate significantly toward the opposite S side reel stand. In this case, since the band fixing member is rotated against the pressing force of the elastic means that elastically presses the band fixing member, it is possible to prevent the brake band from being torn off.

[Brief explanation of drawings]

1 to 5 show an example of the implementation of the tape tensioning mechanism in the tape running device of the present invention. FIG. 1 is a plan view showing the state of the tape tensioning mechanism in recording or playback mode, and FIG. A plan view showing the state of the tape tensioning mechanism in tape fast forward mode or tape rewinding mode, FIG. 3 is an exploded perspective view showing the main parts of the tape tensioning mechanism, and FIG. 4 is a cross section taken along the - line in FIG. 1. 5 is a sectional view taken along the - line in FIG. 1, and FIG. 6 is a schematic plan view showing an example of a tape tensioning mechanism in a conventional tape running device. Explanation of symbols, 1... Tape tension mechanism, 2... Reel stand, 3... Chassis portion, 4... Reel stand support shaft, 5... Brake drum, 9... Ten leg gear arm, 11... Ten leg pin, 30... Brake band, 45... Band fixing member, 60... Supply side tape reel, 65... Locking means, 65, 70
...Brake release means.

Claims (1)

[Scope of Claim for Utility Model Registration] In a tape tensioning mechanism in a tape running device that does not have a member for regulating the tape path between the supply tape reel and the tension pin, there is provided a reel stand that rotates integrally with the supply tape reel; , a ten-leg gear arm that is rotatably supported by the chassis part and has a ten-leg pin erected at its swinging end around which the tape pulled out from the supply-side tape reel is wound; A brake band wrapped around a brake drum, the other end of the brake band being fixed,
The band fixing member is rotatably supported on the support shaft of the reel stand, a locking means for locking the ten-leg gear arm, and a brake release means. By locking in a predetermined position by the locking means, the tension pin becomes a tape guide post fixedly placed at a predetermined position, and the band fixing member is moved to the brake release position by the brake release means. A tape tensioning mechanism in a tape running device, characterized in that the direction in which a brake band is loosened when moved is tangential to a brake drum.