JP3055109U - Magnetic recording / reproducing device - Google Patents

Abstract

(57) Abstract: In a magnetic recording / reproducing apparatus, the configuration of a control mechanism for braking a reel base during loading is simplified to reduce the number of components. SOLUTION: One end 19a of a brake band 19 wound around a reel base 1a is connected to a brake torque adjusting member 23, and the other end 19b is connected to a tension lever 27. The control mechanism 40 includes the cam member 15 and the control lever 3
1, an engaging portion 34, an engaging pin 41, and a spring member 43 attached to the brake torque adjusting member 23. The cam member 15 includes a valley portion 16 and ridge portions 17 on both sides thereof,
18. The engaging pin 41 pushes the receiving portion 42 of the spring member 43 and swings the brake torque adjusting member 23 toward the tension side of the brake band 19 when the engaging portion 34 rides on either of the peak portions 17 and 18. It is made to move.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a magnetic recording / reproducing device.

[0002]

[Prior art]

 A schematic configuration of the magnetic recording / reproducing apparatus will be described with reference to FIG. In the figure, C is a tape cassette having a supply reel C1 and a take-up reel C2, and these supply reel C1 and take-up reel C2 are set on reel stands 1a and 1b. Reference numeral 2 denotes a movable loading post, which is provided to pull out the magnetic tape T from the tape cassette 1 and wind it around the head cylinder 3. 4 is a full width erasing head, 5 is a voice erasing head, and 6 is a voice control head. 7 is a fixed tape guide post, 8 is a tension post for applying tension to the loaded tape T, 9 is a capstan, 10 is a pinch roller, 11 is an arm, 12 is a support shaft of the arm 11, and 13 is a rotary cam. It is. The pinch roller 10 is moved toward and away from the capstan 9 through the swing operation of the arm 11 controlled by the rotation of the rotary cam 13.

In this type of magnetic recording / reproducing apparatus, JP-A-62-200558 discloses that a brake band is wound around a reel base 1a on which a supply reel C1 is set, and in a reproducing mode (forward mode), It is described that the reel band 1a is braked by being brought into contact with the reel table 1a by pulling the brake band to prevent the tape from becoming loose due to such braking.

[0005] On the other hand, FIGS. 5 to 7 show a case where the tape T is pulled out by the left and right loading posts 2 and wound around the header cylinder 3 after the tape cassette T is set in the magnetic recording / reproducing apparatus described with reference to FIG. Conventional means for preventing the tape T from sometimes becoming loose are shown. Hereinafter, with reference to FIGS. 4 and 5 to 7, conventional means for preventing the tape T from being loosened during loading, including other related parts, will be described.

[0005] Reference numeral 19 denotes a brake band wound around the reel base 1a, which is composed of a band main body 21 made of a resin sheet having an appropriate extensibility and a flexible pad 22 held inside the band main body 21. . A brake torque adjusting member 23 and a tension lever 27 are disposed on the left side of the reel base 1a so as to be swingable via a first support shaft 24 and a second support shaft 28 provided on the chassis 20. It has been done. While one end 19a of the brake band 19 is held at the eccentric portion of the brake torque adjusting member 23, the other end portion 19b of the brake band 19 is connected to the connecting member 29 provided at the eccentric portion of the tension lever 27. Is held. The tension lever 27 is urged in the counterclockwise direction in the figure by a spring 30, and the tip is provided with the tension post 8 described above. Reference numeral 25 denotes a brake torque adjusting screw provided on the brake torque adjusting member 23.

Reference numeral 15 denotes a cam member formed of a cam plate, and its right and left movement (arrow X in FIG. 5) is controlled by the rotating cam 13 shown in FIG. The cam member 15 is provided with a first peak portion 17 and a second peak portion 18 which are distributed on both sides of the valley portion 16. A control lever 31 is provided corresponding to the cam member 15. The control lever 31 is rotatably supported by a third support shaft 33 provided on the chassis 20, and has an engaging portion 34 protruding from one end thereof. The control lever 31 is constantly urged in the counterclockwise direction in the figure by the spring 35, and the engaging portion 34 is always engaged with the cam surface of the cam member 15 by the force of the spring 35. A control plate 36 made of a leaf spring is attached to the control lever 31 in a cantilever manner, and the control plate 36 faces the reel base 1a with the brake 19 interposed therebetween.

In the above, when the tape cassette T is set, the tension lever 27 swings the tension post 8 to the retracted position at the position shown in FIG. The cam member 15 is at the position shown in FIG. 5, and the engaging portion 34 of the control lever 31 rides on the first mountain portion 17. For this reason, the pressing plate 36 provided on the control lever 31 elastically presses the intermediate portion of the brake band 19 against the reel base 1a to keep the reel base 1a in a braking state (second braking state). The second braking state is a gentle braking state in which the tape T pulled out from the tape cassette 1 during loading described below does not loosen.

[0008] In the first stage of the loading mode, the cam member 15 has stopped at its previous position. In the first stage, as described above, the loading posts 2 and 2 move along a predetermined path to draw out the magnetic tape T from the tape cassette 1 and wind it around the head cylinder 3. While such loading is being performed, the tension lever 27 swings around the second support shaft 28 as shown by an arrow a in FIG. 6 to move the tension post 8 to the above-described retracted position and the operation position described below. And move it to an intermediate position.

Thereafter, the process proceeds to the second stage of the loading mode, in which the cam member 15 moves to the right as indicated by an arrow X1 in FIG. It falls into the part 16. When the engaging portion 34 falls into the valley portion 16 in this manner, the control lever 31 rotates clockwise in the drawing in conjunction with the engagement portion 34, so that the presser plate 36 retreats and the above-described second braking state is released. Therefore, the reel base 1a is not braked by the brake band 19.

Next, the process proceeds to the third stage of the loading mode. In this third stage, the cam member 15 moves further to the right as shown by the arrow X1 in FIG. 6, and the movement causes the engaging portion 34 of the control lever 31 to move to the second mountain portion 18 of the cam surface as shown in FIG. Get on. Since the height of the second peak portion 18 is lower than that of the first peak portion 17, even if the engaging portion 34 rides on the second peak portion 18, the holding plate 36 holds the brake band 19 on the reel base 1a. Either not, or if at all, only with a small force. On the other hand, the tension lever 27 swings counterclockwise from the intermediate position in FIG. 6 as shown by the arrow b in FIG. 7 to move the tension post 8 to the operating position. As a result, the loading is completed and the tape T is wound around the head cylinder 3 as shown in FIG. 4, and the back tension by the tension post 8 is applied to the tape T. When the tension lever 27 has moved the tension post 8 to its operating position, the other end 19b of the brake band 19 held by the tension lever 27 via the connecting member 29 is indicated by an arrow c in FIG. Thus, the brake band 19 comes into contact with the reel base 1a to keep the reel base 1a in a braking state (first braking state). The first braking state is a braking state that can prevent the tape T from being loosened in the reproduction mode performed after the loading is completed.

[0011]

[Problems to be solved by the invention]

 In the conventional magnetic recording / reproducing apparatus as described above, although the brake band 19 necessary for maintaining the first braking state at the time of reproduction on the reel base 1a is provided, the reel base 1a In order to maintain the second braking state at the time of loading with the brake band 19, an extra pressing plate 36 is required in addition to the brake band 19. In addition, the holding plate 36 is formed by a leaf spring attached to the control lever 31, and the setting of the pressing position and the pressing strength of the brake band 19 by the holding plate 36 requires high precision. This has been a constraint on keeping production costs low.

[0012] The present invention has been made in view of the above-described circumstances, and utilizes a brake torque adjusting member and a brake band conventionally used to obtain the above-described first braking state. It is an object of the present invention to provide a magnetic recording / reproducing apparatus which can obtain a required second braking state of the reel base 1a at the time of loading without using the above-mentioned holding plate made of a spring.

[0013]

[Means for Solving the Problems]

 A magnetic recording / reproducing apparatus according to the present invention includes a reel base provided corresponding to a tape cassette supply reel, a brake band wound around the reel base, and a first support shaft. A brake torque adjusting member capable of swinging around and holding one end of the brake band at an eccentric portion thereof; and a swingable member swinging around a second support shaft and holding and loading the other end portion of the brake band at the eccentric portion. The tension post that applies tension to the tape thus set is swung between its operating position and the retracted position, and when the tension post is swung to the operating position, the other end of the brake band is pulled. A tension lever for setting the reel base to the first braking state by bringing the brake band into contact with the reel base; A control mechanism for rotating the brake adjusting member to pull one end of the brake band to bring the brake band into contact with the reel base to set the reel base to the second braking state. Things.

In this invention, when loading is completed and the tension post is moved to the operating position by swinging of the tension lever, the other end of the brake band is pulled by the tension lever and comes into contact with the reel base. As a result, the reel base is kept in the first driven state. During loading, the brake torque adjusting member is rotated by the control mechanism, one end of the brake band is pulled by the brake torque adjusting member, and the brake band contacts the reel base. As a result, the reel base is kept in the second braking state. Therefore, it is possible to reduce the number of parts by omitting the holding plate 36 made of a leaf spring described with reference to FIGS.

According to a second aspect of the present invention, there is provided the magnetic recording / reproducing apparatus according to the first aspect, wherein the control mechanism comprises a cam member and a longitudinal middle portion rotatable by a third support shaft. A supported control lever, an engagement portion provided at one end of the control lever and operated by the cam member, an engagement pin provided at the other end of the control lever, and the brake torque The brake torque adjusting member is attached to the adjusting member and has a receiving portion that is pushed by the engaging pin. The receiving portion is pushed by the engaging pin, so that the brake torque adjusting member swings toward the pulling side of the brake band. And a spring material to be moved.

In the present invention, the cam member 15, the control lever 31, and the engaging portion 34 described with reference to FIGS. 5 to 7 can be used as they are for the cam member, the control lever, and the engaging portion. Also, the brake torque adjusting member 23 described with reference to FIGS. 5 to 7 can be used as the brake torque adjusting member. In the present invention, it is only necessary to attach a spring member having a receiving portion to the brake torque adjusting member and make the receiving portion correspond to the engaging pin provided on the control lever, so that the conventional magnetic recording and reproducing apparatus can be easily implemented. There are advantages that can be modified.

According to a third aspect of the present invention, there is provided the magnetic recording / reproducing apparatus according to the second aspect, wherein the spring member is positioned concentrically with the first support shaft supporting the brake torque adjusting member. The receiving portion is provided at one end of the torsion coil spring, and the other end is locked by a locking portion provided on the brake torque adjusting member. It is arranged at a position facing the engaging pin provided on the control lever. According to this invention, the same effect as the invention described in claim 2 is exerted.

A magnetic recording / reproducing apparatus according to a fourth aspect of the present invention is the magnetic recording / reproducing apparatus according to the second or third aspect, wherein the cam member is divided into a valley and both sides sandwiching the valley. A first crest portion and a second crest portion, and when the engagement portion of the control lever rides on either the first crest portion or the second crest portion, the engagement pin of the control lever has The pressing member presses the receiving portion of the spring material to swing the brake torque adjusting member toward the tension side of the brake band. According to this invention, the same effect as the invention described in claim 2 is exerted.

A magnetic recording / reproducing apparatus according to a fifth aspect of the present invention is the magnetic recording / reproducing apparatus according to the fourth aspect, wherein when the engaging portion of the control lever falls into the valley of the cam member, The engagement pin of the control lever is separated from the receiving portion of the spring material. According to this invention, the release operation of the second braking state is reliably performed.

The magnetic recording / reproducing apparatus according to the invention described in claim 6 is the magnetic recording / reproducing apparatus according to claim 4 or 5, wherein the loading of the control lever on the first peak portion of the cam member is performed during loading. The engaging portion climbs up, and after the loading is completed, the engaging portion of the control lever climbs up on the second mountain portion of the cam member. According to this invention, the first braking state required at the time of reproduction can be obtained by the tension lever pulling one end of the brake band and the brake torque adjusting member pulling the other end.

[0021]

[Embodiment of the invention]

 1 is a schematic plan view showing a main part of a magnetic recording / reproducing apparatus according to an embodiment of the present invention in a first stage of a loading mode, FIG. 2 is a schematic plan view showing a main part of a second stage of the loading mode, FIG. 3 is a schematic plan view showing a main part in a third stage of the loading mode.

This embodiment is different from the conventional one described with reference to FIGS. 5 to 7 in that the holding plate 36 made of a plate spring is not provided, and the control plate 36 is omitted. The point is that the mechanism 40 is provided.

The control mechanism 40 rotates the brake torque adjusting member 23 during loading to pull one end 19a of the brake band 19 as shown by an arrow d in FIG. It has a function of bringing the reel base 1a into the second braking state by bringing the brake band 19 into contact therewith. The control mechanism 40 includes a cam member 15 similar to that described with reference to FIGS. 5 to 7, a control lever 31 whose longitudinal middle portion is rotatably supported by a third support shaft 33, An engaging portion 34 provided at one end of the lever 31 and operated by the cam member 15, an engaging pin 41 provided at the other end of the control lever 31, And a spring member 43 formed of a torsion coil spring having a receiving portion 42 pressed by the engaging pin 41. The spring member 43 has a braking torque by pressing the receiving portion 42 by the engaging pin 41. It has a function of swinging the adjustment member 23 toward the tension side (the direction indicated by the arrow d in FIG. 1) of the brake band 19. More specifically, the coil member 44 of the spring member 43 has a mounting shaft 45 (see FIG. 5 to FIG. 7) concentric with the first support shaft 24 (see FIGS. 5 to 7) supporting the brake torque adjusting member 23. The receiving portion 42 is provided at one end thereof, and the other end 46 is provided at the brake torque adjusting member 23. The receiving portion 42 is provided at a position facing the engaging pin 41.

The cam member 15 has a valley portion 16 and a first ridge portion 17 and a second ridge portion 18 distributed on both sides of the valley portion 16 as described with reference to FIGS. Is the same as When the engaging portion 34 of the control lever 31 is riding on the first peak portion 17 as shown in FIG. 1, the engaging pin 41 pushes the receiving portion 42 of the spring member 43 to cause the brake torque adjusting member 23 to move. Is pivoted to the tension side (arrow d) of the brake band 19. Similarly, when the engaging portion 34 of the control lever 31 is riding on the second peak portion 18 as shown in FIG. 3, the engaging pin 41 pushes the receiving portion 42 of the spring member 43 to press the brake torque adjusting member. 23 is swung toward the tension side (arrow d 1) of the brake band 19. Further, as shown in FIG. 2, when the engaging portion 34 of the control lever 31 falls into the valley 16 of the cam member 15, the engaging pin 41 of the control lever 31 is separated from the receiving portion 42 of the spring material 43. Has become.

Next, the operation will be described with reference to FIGS. When the tape cassette T is set, the tension lever 27 swings the tension post 8 to the retracted position at the position shown in FIG. The cam member 15 is at the position shown in FIG. 1, and the engaging portion 34 of the control lever 31 rides on the first mountain portion 17 thereof. For this reason, the engaging pin 41 of the control lever 31 presses the receiving portion 42 of the spring member 43, whereby the one end 19 a of the brake band 19 is pulled by the brake torque adjusting member 23 as shown by the arrow d. When the one end 19a of the brake band 19 is thus pulled, the brake band 19 comes into contact with the reel base 1a and keeps the reel base 1a in the second braking state. The second braking state is a gentle braking state in which the tape T pulled out from the tape cassette 1 during loading does not loosen.

In the first stage of the loading mode, the cam member 15 has stopped at the previous position. In the first stage, as described above, the loading posts 2 and 2 move along a predetermined path to draw out the magnetic tape T from the tape cassette 1 and wind it around the head cylinder 3. While such loading is being performed, the tension lever 27 swings around the second support shaft 28 as shown by an arrow a in FIG. 2 to move the tension post 8 to the above-described retracted position and the operation position described later. And move it to an intermediate position.

Thereafter, the process shifts to the second stage of the loading mode, in which the cam member 15 moves to the right as indicated by an arrow X1 in FIG. It falls into the part 16. When the engaging portion 34 falls into the valley portion 16 in this manner, the control lever 31 rotates clockwise in the drawing accordingly, and the engaging pin 41 separates from the receiving portion 42 of the spring member 43. Therefore, the above-described second braking state is released, and the reel platform 1a is in a state where it is not braked by the brake band 19.

Next, the process proceeds to the third stage of the loading mode. In this third stage, the cam member 15 moves further to the right as shown by the arrow X1 in FIG. 2, and the movement causes the engaging portion 34 of the control lever 31 to move to the second mountain portion 18 of the cam surface as shown in FIG. Get on. For this reason, the engaging pin 41 of the control lever 31 presses the receiving portion 42 of the spring material 43, whereby the one end 19 a of the brake band 19 is pulled by the brake torque adjusting member 23 as shown by the arrow d. At the same time, the tension lever 27 swings counterclockwise from the intermediate position in FIG. 2 as indicated by the arrow b in FIG. 3 to move the tension post 8 to the operating position. This completes the loading, and the tape T is wound around the head cylinder 3 as shown in FIG. 4, and the back tension is applied to the tape T by the tension post 8. When the tension lever 27 moves the tension post 8 to its operating position, the other end 19b of the brake band 19 held by the tension lever 27 via the connecting member 29 is indicated by an arrow c in FIG. To be pulled. Accordingly, both ends of the brake band 19 at one end 19a and the other end 19b are pulled as shown by arrows d and c and come into contact with the reel base 1a, and the reel base 1a is maintained in the first braking state. The first braking state is a braking state that can prevent the tape T from becoming loose in the reproduction mode performed after the loading is completed.

In FIGS. 1 to 3, for simplification of description, the same or corresponding parts as those described in FIGS. 5 to 7 are denoted by the same reference numerals, and detailed description is omitted.

[0030]

[Effect of the invention]

 According to the present invention, the second braking state required at the time of loading can be obtained by utilizing the brake torque adjusting member and the brake band conventionally used to obtain the first braking state required at the time of reproduction. In addition, the number of components is reduced because a conventional holding plate made of a leaf spring is not used, and adjustment of the pressing position and the pressing strength of the holding plate is not required, so that a magnetic recording / reproducing apparatus can be provided at low cost. Will be able to do it.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing a main part of a magnetic recording / reproducing apparatus according to an embodiment of the present invention in a first stage of a loading mode.

FIG. 2 is a schematic plan view showing a main part in a second stage of the loading mode.

FIG. 3 is a schematic plan view showing a main part in a third stage of the loading mode.

FIG. 4 is a schematic configuration diagram of a magnetic recording / reproducing apparatus.

FIG. 5 is a schematic plan view showing a main part of a conventional magnetic recording / reproducing apparatus in a first stage of a loading mode.

FIG. 6 is a schematic plan view showing a main part in a second stage of the loading mode.

FIG. 7 is a schematic plan view showing a main part in a third stage of the loading mode.

[Explanation of symbols]

 C Tape cassette C1 Supply reel 1a Reel base 8 Tension post 15 Cam member 16 Valley 17 First ridge 18 Second ridge 19 Brake band 19a One end of brake band 19b The other end of brake band 23 Brake torque adjusting member 24 1st support shaft 27 tension lever 28 2nd support shaft 31 control lever 33 3rd support shaft 34 engaging part 40 control mechanism 41 engaging pin 42 receiving part 43 spring material 47 locking part

Claims (6)

[Utility model registration claims] 1. A reel base provided corresponding to a supply reel of a tape cassette; a brake band wound around the reel base; and a brake band swingable around a first support shaft and at an eccentric portion thereof. A brake torque adjusting member that holds one end of the brake band; and a tension post that can swing around the second support shaft and holds the other end of the brake band at an eccentric portion and applies tension to the loaded tape. When the tension post swings between the operating position and the retracted position and the tension post is swung to the operating position, the other end of the brake band is pulled to bring the brake band into contact with the reel base, thereby causing the reel to rotate. A tension lever for setting the platform to the first braking state; and a brake lever for rotating the brake torque adjusting member during loading to Magnetic recording and reproducing apparatus characterized by comprising a control mechanism for setting the reel base to the second braking state by contacting the brake band to the reel stand by to pull one end of the de. 2. The control mechanism includes a cam member, a control lever having a longitudinal middle portion rotatably supported by a third support shaft, and a control lever provided at one end of the control lever and operated by the cam member. An engaging pin provided at the other end of the control lever, and a receiving part attached to the brake torque adjusting member and pushed by the engaging pin. 2. The magnetic recording / reproducing apparatus according to claim 1, further comprising: a spring member for causing the brake torque adjusting member to swing toward a tension side of the brake band by being pushed by an engagement pin. 3. The torsion coil spring according to claim 1, wherein the spring member is a torsion coil spring held concentrically with the first support shaft supporting the brake torque adjusting member, and the receiving portion is provided at one end of the torsion coil spring. The other end portion is locked by a locking portion provided on the brake torque adjusting member, and the receiving portion is provided at a position facing the engaging pin provided on the control lever. 3. The magnetic recording / reproducing apparatus according to 2. 4. The cam member has a valley and first and second ridges distributed on both sides of the valley,
When the engaging portion of the control lever rides on either the first peak portion or the second peak portion, the engaging pin of the control lever pushes the receiving portion of the spring material to adjust the brake torque. 4. The magnetic recording / reproducing apparatus according to claim 2, wherein the member swings toward a tension side of the brake band. 5. An engaging pin of the control lever is separated from a receiving portion of the spring material when the engaging portion of the control lever is dropped into the valley portion of the cam member. 4. The magnetic recording / reproducing apparatus according to 4. 6. The loading portion is engaged with the engaging portion of the control lever on the first peak portion of the cam member, and after loading is completed, the engaging portion of the control lever is engaged with the second peak portion of the cam member. The magnetic recording / reproducing apparatus according to claim 4 or 5, wherein the section is adapted to ride up.