JPH052797A - Tape running device - Google Patents

Abstract

PURPOSE:To prevent an influence due to the fluctuation of a tape tension, to add a back tension whose intensity is always constant regardless of the change of winding amounts to a tape reel, to reduce the number of parts, and to reduce the occupation space. CONSTITUTION:This device is equipped with a friction member 44 connected with a tape guide 48 positioned in the neighborhoods of a tape reel 26 at a supply side, so as to be freely connected and separated by interposing a tape 25, oppressing means 35 and 41 which oppress the pertinent friction member to the above mentioned tape guide post. A load on the traveling is applied to the traveling tape by a frictional loss generated due to the sliding connection with the frictional member, so that the back tension whose intensity is always appropriate can be added. And also, the intensity of the load on the above mentioned traveling is held to be constant regardless of the fluctuation of the tape tension, or the change of the tape winding amounts to the tape reel at the supply side. Moreover, only the friction member and the oppressing means which oppresses the friction member to the tape guide post, are used as the means which adds the back tension, so that the number of parts can be reduced, and the occupation space can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel tape running device. More specifically, for example, it relates to a tape running device such as a tape recorder that performs a predetermined operation by running a tape and needs to apply back tension to the running tape, and improves means for applying back tension to the tape. By doing so, the back tension of a constant strength can be applied without being affected by the fluctuation of the tape tension, and regardless of the change of the winding amount of the tape on the tape reel, and the number of parts is small. The present invention seeks to provide a new tape running device that does not take up space.

[0002]

2. Description of the Related Art For example, in a tape recorder, the tape must be run at a constant speed at least when recording or reproducing, and the tape tension is kept constant in order to keep the tape running speed constant. That is one condition.

There are several means for maintaining the tape tension constant, but generally, the tape is provided with a restraining force for appropriately suppressing the tape running at a position before the magnetic head in the tape running path. Providing a moderate amount of back tension is performed.

FIG. 5 shows an example of a conventional back tension mechanism a provided in a video tape recorder or the like.

In FIG. 1, b is a supply-side tape reel (hereinafter referred to as "S reel") c, which is integrally rotated with a supply-side tape reel (hereinafter referred to as "S-side reel table"),
d is a take-up tape reel (hereinafter, referred to as "T reel") e and a take-up reel stand (hereinafter, referred to as "T reel") that rotates integrally with
It is called "T side reel stand". ), And the tape f is wound around the tape guide posts h, i and other tape guide posts (not shown), head drum, capstan, etc., which are projected from the chassis g after being pulled out from the S reel c, and the T reel e. The recording medium is passed through a predetermined traveling route that is taken up by the tape, and when recording or reproducing is performed, the recording medium is sandwiched by a capstan and a pinch roller and travels in the forward direction.

A base end of j is rotatably supported by a chassis g, a tenon pin k is erected from the rotary end, and a tension spring l constantly applies a turning force in a counterclockwise direction. One end of the biased tension arm, m is fixed to the chassis g, the other end is connected to a position closer to the rotation end than the rotation fulcrum of the tension arm j, and the middle portion is connected to the brake drum n of the S-side reel stand b. This is a wound brake band, and when recording or reproducing is performed, the ten-leg pin k is elastically contacted laterally with the portion of the tape f between the tape guide posts h and i.

When a so-called disturbance such as uneven rotation of the capstan or a change in friction load between the tape guide post or the head drum and the tape f occurs, the tape tension fluctuates. A portion located between the posts h and i moves in the thickness direction thereof, and the ten-legged pin k is moved following the movement, whereby the ten-legged arm j is swung and the brake band m with respect to the brake drum n. The tightening force will be adjusted. As a result, the load on the rotation of the S-side reel stand b is adjusted, so that the restraining force for the tape feeding of the S-reel c is adjusted and the back tension is controlled. That is, when the tape tension is high, the control force is weakened to control the tape tension to be low, and when the tape tension is low, the control force is increased to control the tape tension to be high. To be done.

[0008]

According to the back tension mechanism a as described above, there is an advantage that the back tension can be controlled while feeding back the fluctuation of the tape tension to the back tension control means, but the S side reel stand. Since a brake drum n is provided in the, and a fixing member for fixing the brake band m and the brake band m to the chassis g is required, the number of parts and assembling man-hours and various adjusting man-hours are increased. There is a problem that the tape running device becomes large in size because a considerable space is required for arranging the members.

Depending on the mass of the tension arm j and the spring constant of the tension spring l, the tension arm j may resonate with the fluctuation of the tape tension and oscillate. Furthermore, the tape to the S reel c may be oscillated. As the winding amount decreases, S due to the brake band m
There is a problem in that the rotation restraining force on the side reel base d gradually increases and the tape f is given an excessively strong back tension.

[0010]

Therefore, in order to solve the above-mentioned problems, the tape running device of the present invention contacts the tape guide post, which is located near the tape reel on the supply side, by sandwiching the tape. A friction member that comes into contact with the tape member so as to be separated from each other and an elastic contact means that elastically contacts the friction member with the tape guide post are provided.

[0011]

Therefore, according to the tape running apparatus of the present invention, the running tape is given a load for running due to the friction loss caused by the sliding contact with the friction member. In addition, the load on the above running is maintained at a constant strength regardless of fluctuations in tape tension and changes in the amount of tape wound on the tape reel on the supply side, so the strength of the back tension applied to the tape is The number of parts is small and the location can be kept constant, and only the friction member and the elastic contact means for elastically contacting this with the tape guide post are required as means for applying back tension. It can be a structure that does not take.

[0012]

The details of the tape running device of the present invention will be described below with reference to the illustrated embodiments.

The embodiment shown in FIG.
It is applied to an audio tape recorder (hereinafter referred to as "DAT").

Reference numeral 1 is a DAT (only a mechanical deck is shown in the drawing).

Reference numeral 2 denotes the front-back direction (the lower side in FIG. 1 is the front side,
The upper side is the rear side, the left side in the figure is the left side, and the right side is the right side. Further, the paper surface side is the upper side and the paper spine side is the lower side. The following directions also apply depending on this direction. ) Is a long and substantially rectangular mechanical chassis, and a reel stand arrangement hole 3 that is long in the left-right direction is formed in a portion near the front end edge of the mechanical chassis, and the mechanical chassis is formed between the reel stand arrangement hole 3 and the rear end edge. The guide holes 4 and 4'arranged so as to form an inverted V shape are formed, and the catchers 5 and 5 are positioned so that the front ends thereof face the rear ends of the guide holes 4 and 4'from above. ´ is fixed.

Reference numerals 6 and 6 ′ are cassette positioning pins that project upward from the upper surface of the mechanical chassis 2 or the support piece 7 fixed to the mechanical chassis.

Reference numeral 8 denotes a sub-chassis disposed below the mechanical chassis 2, which has a substantially rectangular shape that is long in the left-right direction and faces the front half of the mechanical chassis 2 in a substantially parallel manner at a predetermined interval. It is fixed to the mechanical chassis 2 in the completed state.

Reference numeral 9 denotes a supply-side reel stand (hereinafter referred to as "S-side reel stand"), and 10 denotes a winding-side reel stand (hereinafter, referred to as "reel stand").
It is called "T side reel stand". ) And these reel stands 9
Reference numerals 10 and 10 denote brake drums 1 on which brake shoes 11 and 11 '(only shown in FIG. 1) provided on a brake slider or a brake arm are in contact with each other so that they can be separated from each other.
2, 12 'and gear portions 13 and 13' in which idler gears (not shown) for driving the reel base are disengageably engaged, and reel engaging shafts 14 and 14 'in which tape reels of a tape cassette described later are engaged. Composed so as to rotate integrally.

The reel stands 9 and 10 stand upright from the sub-chassis 8 with a predetermined interval in the left-right direction, and the upper part thereof protruding upward from the mechanical chassis 2 through the reel stand placement hole 3. It is rotatably supported by the provided reel base support shafts 15 and 15 '.

In the play mode for recording or reproduction and the fast-forward mode for fast-forwarding the tape, an idler gear (not shown) meshes with the gear portion 13 'of the T-side reel base 10 to wind the reel base 10. Take direction,
That is, in the rewinding mode in which the tape is rewound in the clockwise direction in FIG. 1 and the tape is rewound, the idler gear is meshed with the gear portion 13 of the S-side reel base 9 to cause the reel base 9 to rotate.
Is rotated in the tape winding direction, that is, the counterclockwise direction in FIG.

Reference numeral 16 denotes a head drum arranged on the upper surface of the mechanical chassis 2 between the rear end portions of the guide holes 4 and 4 ', and its rotating portion 16a has a rotation locus along the outer peripheral surface of the head drum. .. (only one is shown in the drawing) are attached to the plurality of magnetic heads 17, 17 ,.

Reference numerals 18 and 18 'denote tape loading blocks, and these tape loading blocks 18 and 1'
Reference numeral 8'denotes moving bases 19 and 19 'which are moved along the guide holes 4 and 4', tape loading posts 20 and 20 'standing upright from the moving bases 19 and 19', and inclined guide posts 21 and 21 '. Consisting of a loading motor 2
By means of a loading ring (not shown) rotated by 2 (only shown in FIG. 1), the loading is crimped to the non-loading position shown in solid line in FIG. It is designed to be moved to and from the completion position.

Reference numeral 23 is a tape cassette (only shown in FIG. 1).

A reference numeral 24 designates a cassette case having a relatively thin rectangular box shape. The magnetic tape 25 has both ends fixed in the cassette case 24 and is wound by a predetermined amount. 26 and a tape reel on the winding side (hereinafter referred to as "T reel") 2
7 is rotatably accommodated, and a part of the magnetic tape 25 is led out to the outside of the cassette case 24 through tape outlets 28, 28 'formed at both ends of the front surface of the cassette case 24. In the state before tape loading, as shown by the thick double-dashed line in FIG. 1, the tape pull-out recess 29 formed between the two tape outlets 28 and 28 ′ of the front surface of the cassette case 24.
Is passed through the front of.

When the tape cassette 23 is mounted on the DAT 1, the cassette case 24 is mounted on the cassette positioning pins 6 and 6'provided on the mechanical chassis 2 and a cassette mounting portion (not shown) for positioning. At the same time, the tape reels 26 and 27 are engaged with the reel engaging shafts 14 and 14 'of the reel mounts 9 and 10, respectively.
The S reel 26 and the S side reel stand 9 are also connected to the T reel 2
7 and the T-side reel stand 10 are in a state of rotating integrally respectively.

Reference numeral 30 denotes a capstan which is erected from a flywheel (not shown) located below the mechanical chassis 2, and is arranged so as to project from a position of the mechanical chassis 2 which is separated from the head drum 16 in a diagonally forward right direction. Has been done.

Reference numeral 31 is a pinch roller arm having a substantially l-shape. The right end of the pinch roller arm is rotatably supported by the mechanical chassis 2, and the pinch roller 33 is rotated by a support shaft 32 erected from the rotating end. It is supported freely, and is moved between a non-loading position shown by a solid line in FIG. 1 and a play position shown in FIG. 2 by a moving means (not shown).

Reference numeral 34 is a back tension applying means for applying a back tension to the magnetic tape 25 running in the play mode. The means 34 is a mechanical chassis 2
The rotary arm rotatably supported on the rotary arm, a tension spring for urging the rotary arm to rotate, and a friction member fixed to the rotary arm.

Reference numeral 35 denotes a rotating arm, and the rotating arm 3
5 is an elongated plate shape, and a spring hook portion 3 is provided at the base end thereof.
6 is formed, and a support hole 37 is formed at a position closer to the tip of the spring from the spring hook portion 36, and a portion 38 of one side edge thereof near the support hole 37 regulates the position of the rotating arm 35. It is a regulated edge to do.

Reference numeral 39 denotes a support shaft standing upright from the left side of the reel stand arrangement hole 3 on the upper surface of the mechanical chassis 2. The rotating arm 35 is formed by inserting the support shaft 39 into the support hole 37. The mechanical chassis 2 is rotatably supported.

Reference numeral 40 denotes a spring hooking pin provided upright on the mechanical chassis 2, and a tension spring 41 having a relatively small spring constant is stretched between the spring hooking pin 40 and the spring hooking portion 36 of the rotating arm 35. The rotating arm 35
Is constantly energized with a turning force in the counterclockwise direction in FIG.

Reference numeral 42 is a support plate fixed to the rotating arm 35, and a mounting piece 42a extending horizontally from the lower end is provided with a screw 43.
It is fixed to the rotating end of the rotating arm 35 by.

Reference numeral 44 is a friction member, which is the support plate 4 described above.
The base 45 is fixed to the upper end of the surface of the two vertically extending support pieces 42b facing the left side, and the contact film 46 is attached to the surface of the base 45 opposite to the support pieces 42b.

The base 45 is made of, for example, felt or rubber, and the contact film 46 is made of a synthetic resin film having a relatively small friction coefficient and good wear resistance.

The rotating arm 35 is in the non-loading position in the state before the tape loading is performed, and the left tape loading block 1 is located.
8 against the elastic force of the tension spring 41,
Is held at the non-loading position indicated by the solid line, and when the tape is loaded, the elastic force of the tension spring 41 moves it to the standby position indicated by the chain double-dashed line in FIG. Due to the elastic force, the contact position shown in FIG.
Is moved to a position where it is elastically contacted with a tape guide post described later.

Reference numeral 47 is a regulation pin which is erected from a mode switching member (not shown). When the tape is loaded, the pivoting arm 35 has its regulated edge 38 abutting against the regulation pin 47 from the right side. Is held in the standby position by the control pin 4 and when the play mode is entered,
When 7 is moved to the left, it is rotated to the contact position.

Reference numeral 48 denotes a tape guide post, which is erected from the mechanical chassis 2 and has upper and lower flanges 49 and 4.
9 is formed.

Further, 50, 51 and 52 are tape guide posts having substantially the same structure as the tape guide post 48.

The tape guide post 48 is DAT.
The tape guide post 50 is arranged right behind the tape outlet 28 on the left side of the tape cassette 23 mounted on the first tape cassette 23, and is arranged between the tape guide post 48 and the left side tape loading block 18 at the loading completion position. Further, the tape guide post 51 is arranged between the right side tape loading block 18 'and the capstan 30 which have reached the loading completion position, and the tape guide post 52 is located on the right side of the tape cassette 23 mounted on the DAT 1. It is located directly behind the tape outlet 28 '.

Reference numeral 53 denotes a lid guide movably supported on the mechanical chassis 2. Before the tape loading, it is in the non-loading position shown by the solid line in FIG. 1 is moved to the loading completion position indicated by a two-dot chain line.

Therefore, DAT1 configured as described above
The operations such as tape loading, recording and reproduction, and tape unloading are performed as follows, for example.

When the tape cassette 23 is mounted on the DAT 1, the pinch roller 33 in the non-loading position, the friction member 44 supported by the rotating arm 35, the flip guide 53, the tape loading block 18, 1
The tape loading posts 20 and 20 'and the inclined guide posts 21 and 21' of 8'are relatively inserted into the tape pull-out concave portion 29 formed in the cassette case 24 to lead the magnetic tape 25 out of the cassette case 24. It opposes the part that is being marked from the inside.

When a tape loading command is issued, the tape loading blocks 18, 18
'And the slide guide 53 are moved to the loading completion position, and the pinch roller 33 is moved to the standby position before the play position, that is, the position shown by the two-dot chain line in FIG. The moving arm 35 is moved to the standby position by the pulling force of the tension spring 41 and the regulation pin 47.

As a result, the magnetic tape 25 is pulled out from the cassette case 24 by a predetermined amount, and the pulled out portions are the tape guide posts 48 and 50, the left tape loading post 20, the inclined guide post 21, the head drum 16, and the right side. Inclined guide post 21 ', tape loading post 20', tape guide post 5
1, the capstan 30, the flip guide 53, and the tape guide post 52 are wound in this order and passed through the path indicated by the thin chain double-dashed line in FIG.

This completes the tape loading.

Fast forward and rewind of the magnetic tape 25 are performed in this state, that is, in the state where the friction member 44 provided on the pinch roller 33 and the rotating arm 35 is not in contact with the magnetic tape 25.

When the tape loading is performed in this way, the brake shoes 11, 11 'described above are also used.
The left one 11 is separated from the brake drum 12 of the S-side reel stand 9, and the T-side reel stand 10 is braked by the right brake shoe 11 '.
Since the T reel 27 is prevented from rotating, the magnetic tape 25 is pulled out from the S reel 26.

When a recording or reproducing command is issued, the capstan 30 is rotated counterclockwise in FIG. 1 at a constant speed, and the brake shoe 1 is rotated.
Braking of the reel bases 9 and 10 by 1, 11 'is released, and the T-side reel base 10 is rotated in the tape winding direction. Along with this, the pinch roller 33 is moved to the play position and pressed against the capstan 30 with the magnetic tape 25 sandwiched therebetween, whereby the magnetic tape 25 is caused to run, and the head drum 16 is further rotated.

The magnetic tape 2 that is run in this way
5 is recorded or reproduced by the magnetic head 17 of the head drum 16.

When a recording or reproducing command is issued, the above-mentioned restriction pin 47 is moved to the left, so that the rotating arm 35 is further counterclockwise from the standby position by the pulling force of the tension spring 41. The friction member 44 is elastically contacted with the tape guide post 48 with the magnetic tape 25 sandwiched therebetween by being rotated in the rotation direction.

Therefore, in the magnetic tape 25, a portion near the S reel 26 of the portion pulled out from the cassette case 24 is held by the friction member 44 and the tape guide post 48, and the magnetic tape 25 is run in this state. A load due to a friction loss generated between the friction member 44 and the friction member 44 is applied, and the back tension is applied by this load.

Incidentally, since the tape winding diameter on the S reel 26 becomes gradually smaller as the magnetic tape 25 runs, the ratio of the load of the rotation of the S side reel base 9 to the tape pulling output. Is gradually increased, and thus the tape tension between the S reel 26 and the friction member 44 is gradually increased, but the tension in the portion beyond the friction member 44 is held by the contact film 46 of the friction member 44. Friction coefficient and pressure force of the friction member 44 to the tape guide post 48, that is, the rotating arm 3
It is held substantially constant by the turning radius of No. 5 and the moment by the tensile force of the tension spring 41.

Therefore, the back tension applied between the friction member 44 and the capstan 30 of the traveling magnetic tape 25 is always maintained at a substantially constant strength.

When a command for tape unloading is issued, the braking of the S-side reel stand 9 by the brake shoe 11 is released, and the S-side reel stand 9 is driven in the tape winding direction. The tape loading blocks 18, 18 ', the flip guide 53, the pinch roller 33, and the rotating arm 35 are returned to the non-loading positions.

As a result, the magnetic tape 25 pulled out from the cassette case 24 is rewound onto the S reel 26.

[0056]

As is apparent from the above description, in the tape running device of the present invention, the tape pulled out from the tape reel on the supply side is wound around at least the tape running means and the plurality of tape guide posts. A tape running device which requires running a tape in a state where it is passed through a predetermined running path wound on a side tape reel and performing a predetermined operation on the tape in the running path and applying back tension to the running tape. And a friction member for contacting the tape guide post, which is located near the tape reel on the supply side, with the tape interposed therebetween, and the elastic contact means for elastically contacting the friction member with the tape guide post. And are provided.

Therefore, according to the present invention, the traveling tape is given a load for traveling due to the friction loss caused by the sliding contact with the friction member, so that the back tension of moderate strength is always applied to the tape. Can be added.

The load on the running is maintained at a constant strength irrespective of the fluctuation of the tape tension and the change of the tape winding diameter on the supply side tape reel, so that the back tension applied to the tape is always constant. Can hold on to strength.

Moreover, as the means for applying the back tension, only the friction member and the elastic contact means for elastically contacting the friction member with the tape guide post are sufficient, so that the number of parts is small and the space is not required. be able to.

In the above embodiment, the friction member is fixed to the arm biased by the elastic turning force in the predetermined direction, and the friction member is tape-guided by the turning force biased by the arm. Although it is designed to be elastically contacted with the post, the means for elastically contacting the friction member with the tape guide post is not limited to such an arm, and the friction member can be elastically contacted with the tape guide post. It may have any structure as long as it has a structure.

In the above embodiment, the friction member is composed of two members, the base made of felt and the resin film attached to the tape contact surface of the base. There is no particular limitation to such a material, and any structure or material may be used as long as it has good wear resistance, a relatively small coefficient of friction, and does not damage the tape. good.

In the above embodiment, the present invention is
Although the one applied to the AT is shown, the present invention is not limited to such an application example, and can be applied to various tape running devices that require back tension to be applied to a running tape.

[Brief description of drawings]

FIG. 1 is a plan view of a mechanical deck in a state before tape loading, showing an example in which the tape running device of the present invention is applied to a DAT.

FIG. 2 is a plan view of the mechanical deck in a state where recording or reproduction is performed.

FIG. 3 is a front view of a main part.

FIG. 4 is a perspective view showing a friction member and a member supporting the friction member.

FIG. 5 is a schematic plan view showing an example of a back tension mechanism in a conventional tape running device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Tape running device 25 Tape 26 Supply side tape reel 27 Winding side tape reel 30, 33 Tape running means 35, 41 Elastic contact means 44 Friction member 48 Tape guide post 20, 20 ', 21, 21 ', 50, 51, 52, 53
Tape guide post

Claims (1)

Claim: What is claimed is: 1. Predetermined running, in which a tape drawn from a supply-side tape reel is wound around at least tape running means and a plurality of tape guide posts and then taken up by a take-up side tape reel. A tape running device which allows the tape to run in a state where it is passed through the path, performs a predetermined operation on the tape in the running path, and applies back tension to the running tape, near a tape reel on the supply side. A tape running device comprising a friction member that comes into contact with the tape guide post located at a position such that the tape is sandwiched between the tape guide post and the tape guide post, and an elastic contact means that elastically contacts the friction member with the tape guide post. ..