JPH08167198A - Reel braking mechanism - Google Patents

Abstract

PURPOSE: To surely apply braking force to a reel by driving a coupling member by the action of a pair of sliding cams and allowing an abutting member to abut on or be away from the reel base. CONSTITUTION: Guide rails 2a and 2b are fixed on a chassis 1 by fixing members 3a and 3b. The reel bases 4a and 4b for mounting the reels 6a and 6b guided by the guide rails 2a and 2b are installed. The base 4a is guided to move in a direction shown by an arrow A1 by the guide rail 2a and the base 4b is guided to move in a direction shown by an arrow A2 by the guide rail 2b, or they move in a reverse direction. Thus, even when the reels 6a and 6b move corresponding to a cassette 21 having a different size, the coupling member is driven by the action of a pair of sliding cams 12a and 12b and the abutting member is allowed to abut on or be away from the reels 6a and 6b so as to surely apply the braking force to the reels 6a and 6b as necessary.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel stand brake mechanism such as a VTR.

[0002]

2. Description of the Related Art Portable VTRs are smaller and lighter, and are stationary VTRs.
In TR, it is required to lengthen the recording / reproducing time, and cassette tapes having different sizes and different reel intervals are used according to their respective purposes. For this reason, in order to mount cassettes of different sizes on the same VTR, a reel base moving device and a reel base brake mechanism corresponding to the reel base movement have been proposed. 14 to 16 show a conventional reel stand brake mechanism disclosed in, for example, Japanese Patent Application Laid-Open No. 2-210648.

FIG. 14 is a front view showing a state in which a large size first cassette is mounted, FIG. 15 is a front view showing a state in which a small size second cassette is mounted, and FIG. 16 is a side sectional view of an essential part. is there. In FIG. 14, 1 is a chassis, 5a and 5b are reel motors attached to the chassis 1, and 80 is a reel motor.
Reference numerals a and 80b are rotary bases that are rotatably supported by the chassis 1 around the rotation centers of the reel motors 5a and 5b, respectively, and 6a and 6b are the rotary bases 80, respectively.
It is a pair of reel stands rotatably supported by a and 80b. The reel motors 5a and 5b are arranged such that the rotation axis centers thereof are equidistant from the reel table position corresponding to the first cassette of the pair of reel tables 6a and 6b and the reel table position corresponding to the second cassette. It is attached to the chassis 1.

81a and 81b are the reel motors 5a and
5b is a reel base driving member engaged so as to rotate integrally with the rotating shaft of 5b, and engages with the reel bases 6a and 6b on the outer periphery. Reference numerals 82a and 82b are solenoids attached to the chassis 1, 8a and 8b are brake arms rotatably supported by the chassis 1, and 84a and 84b have one end at the brake arms 8a and 8b and the other end at the solenoid. The link members 10a, 10b engaging with the movable parts of the 82a, 82b are the brake arms 8a, 8b.
It is a brake pad attached to one end of.

Reference numerals 83a and 83b are worm wheels rotatably supported by the chassis 1, 86a and 86b are arms fixed to the worm wheels 83a and 83b, and 87a and 87b are one ends of the arms 86a and 86b.
Is a link that engages with one end of the and the other end engages with the rotary bases 80a and 80b. Reference numeral 88 is a drive motor fixed to the chassis 1, 85 is a worm press-fitted into a rotary shaft 89 of the drive motor 88, and the worm 85 is engaged with the worm wheels 83a and 83b. 90
Reference characters a, 90b, 91a, 91b are positioning members fixed to the chassis 1, and are installed at positions where they abut on pins 92a, 92b provided at one end of the rotary bases 80a, 80b. 21 is a large-sized first cassette, and 70 in FIG. 15 is a small-sized second cassette.

Next, the operation will be described. FIG. 14 shows a state in which the first cassette 21 is mounted, and when the second cassette 70 is mounted from this state, the detection means (not shown) detects that the second cassette 70 is mounted. Then, the drive motor 88 is driven to rotate the worm wheels 83a and 83b through the worm 85 in the Q and R directions in the figure, respectively. Since the arms 86a and 86b are fixed to the worm wheels 83a and 83b, the arms 86a and 86b also rotate in the Q and R directions, respectively, and the rotation bases 80a and 80b are respectively moved by the links 87a and 87b to the reel motors 5a and 5b. It is rotated in the S and T directions in the figure with the center of rotation as the center of rotation. And pin 92
When the a and 92b come into contact with the positioning members 91a and 91b, the reels 6a and 6b are stopped and the second cassette 7 is stopped.
Move it to the position corresponding to 0. Therefore, the state shown in FIG. 15 is set and the second cassette 70 can be mounted.

In this state of FIG. 15, a loading operation of a magnetic tape (not shown) is carried out, and a recording / reproducing state is set. When the magnetic tape is run in the recording / reproducing state, the movable parts arranged inside the solenoids 82a, 82b and connected to the link members 84a, 84b receive a force in the direction of being drawn into the solenoids, respectively.
The brake arms 8a and 8b are link members 84a and 84b.
Driven by the brake pads 10a, 10b are separated from the reel base drive members 81a, 81b.
Therefore, the magnetic tape can be run by rotating the reel bases 6a and 6b through the reel drive members 81a and 81b by the reel motors 5a and 5b. When the magnetic tape is stopped without running, the rotational drive of the reel motors 6a and 6b is stopped, and a force is applied to the movable portions of the solenoids 82a and 82b in the directions to push them out of the solenoids, so that the brake arms 8a and 8b.
Are driven by link members 84a and 84b to move the brake pads 10a and 10b to reel base drive members 81a and 81b.
By abutting on b, rotation of the reel stands 6a and 6b is prevented via the reel stand drive member.

Next, when the first cassette 21 is loaded from the state where the second cassette 70 shown in FIG. 15 is loaded, it is detected by the detection means (not shown) that the first cassette is loaded. The drive motor 88 is driven in the opposite direction to the above to drive the worm wheel 83 through the worm 85.
a and 83b are respectively rotated in the V and W directions in the drawing to rotate the arms 86a and 86b in the V and W directions, respectively. Then, the rotary base 8 is connected by the links 87a and 87b.
0a and 80b are rotated about the rotation centers of the reel motors 5a and 5b in the X and Y directions in the drawing to stop when the pins 92a and 92b come into contact with the positioning members 90a and 90b. , 6b are moved to positions corresponding to the first cassette 21. Therefore, FIG.
As shown in FIG. 4, the first cassette 21 can be mounted.

Even in this state, the loading operation of the magnetic tape (not shown) is performed and the recording / reproducing state is set.
When the magnetic tape is run in the recording / reproducing state, the movable portions of the solenoids 82a and 82b are attracted in the direction of being drawn into the solenoids, and the brake arms 8a and 8b are driven by the link members 84a and 84b and the brake pad 10a. 10b are separated from the reel base driving members 81a and 81b. Therefore, the reel motors 5a and 5b are used to drive the reel base driving members 81a and 8a.
The magnetic tape can be run by rotating the reel base via 1b. When the magnetic tape is stopped without running, the reel motors 5a, 5b
Rotation of the solenoid is stopped and the solenoids 82a, 82
The movable parts of b are attracted in the direction of being pushed out of the solenoid, and the brake arms 8a and 8b are connected to the link member 8
The brake pad 10 is driven by 4a and 84b.
When a and 10b are brought into contact with the reel base driving members 81a and 81b, the reel bases 6a and 6b are prevented from rotating via the reel base driving members 81a and 81b.

[0010]

Since the conventional reel stand brake mechanism is constructed as described above and the reel stand drive member is used to apply the braking force to the reel stand, the braking torque value applied to the reel stand is directly controlled. Compared to the case where power is applied to the reel stand, it becomes inappropriate, and the difference between the tape take-up speed of the take-up reel and the tape take-up speed of the take-up reel when applying braking force to the rotating reel stand is too small or excessive. Therefore, there is a problem that the tape is damaged when the tape is stopped and the tape is damaged by applying excessive tension to the tape, and there is rattling between the reel base and the reel base drive member because the reel drive member is braked. During that time, there was a problem that braking force was not generated on the reel stand.

The present invention has been made to solve the above problems. Even if the reel base moves corresponding to a cassette having a different size, the tape is stopped without fail by directly applying a braking force to the reel base. The object is to obtain a reel base brake mechanism that can be used.

[0012]

In a reel stand braking mechanism according to a first aspect of the present invention, a reel stand provided with a pair of reel stands and a mechanism for keeping a distance between the pair of reel stands at a predetermined interval. In the brake mechanism, a pair of reel base mounting bases that are movable on a base and that mount each of the pair of reel bases, and a pair of connecting members attached to each of the pair of reel base mounting bases. A pair of abutting members provided to each of the pair of connecting members, and a pair of sliding cams slidably supported on the base, the pair of sliding cams At least one of the pair of abutting members comes into contact with or separates from the pair of reel bases in accordance with the above operation.

A reel base brake mechanism according to a second aspect of the present invention is the reel base brake mechanism according to the first aspect, wherein at least one of the pair of slide cams has a stop area. The configuration is such that the operating state of the contact member is controlled.

According to a third aspect of the present invention, there is provided a reel base braking mechanism according to the first aspect, wherein at least one of the pair of abutting members is selected depending on the position of the pair of reel bases. The pressing force of the contact member is changed.

[0015]

In the reel stand brake mechanism according to the first aspect of the present invention, the pair of reel stands moves together with the connecting member to the positions corresponding to the plurality of cassette types, and the reel stands at any position, The operation of the pair of sliding cams drives the connecting member to bring the contact member into contact with or away from the reel base.

In the reel stand brake mechanism according to the second aspect of the present invention, the pair of reel stands moves together with the connecting member to a position corresponding to a plurality of cassette types, and the reel stands may be located at any position. The connecting member is driven by the operation of the pair of sliding cams, and the contact area of the pair of sliding cams is combined with the stop area of the pair of sliding cams to select the contact or separation of the contact member.

In the reel stand brake mechanism according to the third aspect of the present invention, the pair of reel stands moves together with the connecting member to the positions corresponding to the plurality of cassette types, and the reel stands at any position, By operating the pair of sliding cams, the connecting member is driven to bring the contact member into contact with or away from the reel stand, and the position of the pair of reel stands allows the pressing force at the time of contact of the contact member with the reel stand. Change.

[0018]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. 1 to 10 are views showing a reel base braking mechanism, FIG. 1 is a front view showing the reel base braking mechanism when a first cassette (large size cassette) is mounted, and FIG. 2 is a second cassette. A front view showing a reel stand brake mechanism when a (small size cassette) is mounted, FIG. 3 is a side view of a main part, FIG. 4 is a perspective view of the main part, and FIGS.
Is an operation explanatory view of the reel base, and FIGS. 7, 8, 9, and 10 are operation explanatory views of the brake arm.

In FIG. 1, 1 is a chassis as an example of a base, 2a and 2b are guide rails fixed to the chassis, 3a and 3b are fixing members for fixing the guide rails 2a and 2b to the chassis 1, 4a and 4b are reel stand bases as an example of a reel stand mounting stand for mounting the reel stand guided by the guide rails 2a and 2b. As shown in FIG. 2, the reel base 4a is guided by the guide rail 2a, and the reel base 4b is guided by the guide rail 2b in the direction of arrow A1 shown in FIG.
It is possible to move in the direction indicated by arrow A2 or in the opposite direction.

In FIG. 3, 5a is a reel motor fixed to the reel stand base 4a, and 6a is a reel stand mounted on the rotation shaft of the reel motor 5a and driven to rotate. Reference numeral 7a is a shaft implanted in the reel base 4a, and 8a is a brake arm as an example of a connecting member rotatably supported by the shaft 7a. 10
Reference numeral a denotes a brake pad, which is attached to one end of the brake arm 8a, is an example of an abutting member that is brought into contact with the reel base to generate a braking force, and 9a is the brake arm 8a.
Spring hooking portion 1 provided at one end of the reel and the reel base
It is a tension spring stretched between 1a.

Reference numeral 12a is a slide cam as an example of a slide cam slidably supported by guide pins 13a implanted in the chassis 1 so as to be substantially parallel to the moving direction of the reel base 4a. Further, as shown in FIG. 1, the configurations from 2b to 13b are symmetrical with the configurations from 2a to 13a, and the same reference numerals are given with the same names and will be described below.

Reference numeral 21 shown in FIG. 1 is a large-sized first cassette, and a pair of reel hubs (not shown) provided in the first cassette 21 and reel stands 6a and 6b shown in FIG. Are engaged. 22 is the first cassette 21
It is a magnetic tape wound around a reel hub inside.

In the main part perspective view of FIG. 4, 18 is a cam gear rotatably supported by the chassis 1, 20 is a cam groove provided in the cam gear 18, 17 is a drive arm pivotally supported by the chassis 1, Reference numeral 16 is a lever guided by a guide pin 25 implanted in the chassis. Drive arm 17
One end is engaged with the cam groove 20 by the follower pin 19, and the other end is engaged with the lever 16. Reference numerals 14 and 15 denote arms for engaging the slide cams 12a and 12b and the lever 16, respectively.

In FIG. 5, 50, 26 and 27 are gear trains rotatably supported by the chassis 1, and 31 is the chassis 1.
Shafts 30 and 30 are drive arms pivotally supported by the shaft 31 as a rotation axis, and 36 and 41 are pins implanted in the drive arm 30. Reference numeral 29 is a groove portion provided at one end of the drive arm 30, 28 is a drive pin provided on the gear 27, and the drive pin 28 is fitted in the groove portion 29.

32 is a shaft implanted in the chassis 1,
Reference numerals 33 and 34 denote rotating arms pivotally supported by the shaft 32 as a rotation axis. Reference numeral 37 denotes a groove portion provided on the rotating arm 33, which is a pin 3 planted on the drive arm 30.
6 is fitted. 38 is a torsion spring suspended between the rotating arms 33 and 34. Reference numeral 35 is a connecting arm that connects the rotating arm 34 and the reel base 4a. Four
Reference numeral 0 is a shaft implanted in the chassis 1, and reference numerals 42 and 45 are rotating arms pivotally supported by the shaft 40 as a rotation axis. Reference numeral 43 is a groove portion provided in the rotating arm 42, and the pin 41 planted in the drive arm 30 is fitted therein. Reference numeral 44 is a torsion spring suspended between the rotating arms 42 and 45. 46 is a rotating arm 45 and a reel base 4
It is a connecting arm that connects between b.

Next, the operation will be described. First, the operation of the reel bases 4a and 4b will be described. When the large-sized first cassette 21 shown in FIG.
In this state, the gear 50 is rotated by a drive motor (not shown) to a predetermined position and stopped.
The drive arm 30 is held at the position shown in FIG. 5 by the drive pin 28 provided at 7. At this time, the drive arm 30
Since the pin 36 planted in is fitted into the groove portion 37 provided in the rotating arm 33, the rotating arm 33 is biased in the D direction in the figure. Since the torsion spring 38 is suspended between the rotation arms 33 and 34, the rotation arm 34 also rotates.
It is urged in the D direction in the figure by the urging force of 8.

Since the reel stand base 4a is connected to the rotating arm 34 by the connecting arm 35, the reel stand base 4a is biased in the F direction in the figure, and eventually the reel stand base 4a.
The a is pressed against a stopper 39 provided on the chassis 1 to be positioned.

The reel base 4b is similar to the reel base 4a, and the pins 4 planted in the drive arm 30 are used.
Since 1 is fitted in the groove portion 43 provided in the rotating arm 42, the rotating arm 42 is biased in the E direction in the figure. Since the torsion spring 44 is suspended between the rotation arms 42 and 45, the rotation arm 45 is urged in the direction E in the figure by the urging force of the torsion spring 44.

Since the reel base 4b and the rotating arm 45 are connected by the connecting arm 46, the reel base 4b is urged in the direction G in the figure, and eventually the reel base 4
b is positioned by being pressed against a stopper 47 provided on the chassis 1 so that the reel stands 6a, 6b
Is set to a position where the reel of the first cassette can be mounted, that is, a position corresponding to the first cassette.

Next, when mounting the small-sized second cassette 70 shown in FIG. 2, the gear 50 is rotated in the direction C in the figure by the drive motor (not shown) from the state shown in FIG. By the movement of the drive pin 28
It rotates in the direction to reach the state shown in FIG. At this time, pin 3
Since 6 is fitted in the groove 37, the rotating arm 33 is biased in the J direction in the figure, and the rotating arm 34 is also biased in the J direction by the biasing force of the torsion spring 38.

Since the reel base 4a is connected to the rotating arm 34 by the connecting arm 35, the reel base 4a is biased in the direction K in the figure, and eventually the reel base 4a is biased by the stopper 60 provided on the chassis 1. Be positioned.

The reel base 4b is similar to the reel base 4a, and since the pin 41 is fitted in the groove 43, the rotating arm 42 is biased in the L direction in the drawing, and the rotating arm 45 is also twisted. The reel base 4b is biased in the M direction in the figure by the biasing force of the spring 44, and is positioned by the stopper 61. Therefore, reel stand 6
a and 6b are positions where the reels of the second cassette can be mounted,
That is, it is set at a position corresponding to the second cassette.

Further, when the first cassette is mounted from this state, the gear 50 further rotates in the direction C in the figure to return to the state shown in FIG. 5, and the reel stands 6a and 6b are brought to the positions corresponding to the first cassette. Set. As described above, the reel stand can be moved corresponding to the two types of cassettes having different sizes.

Next, the operation of the brake arms 8a and 8b will be described. 7, 8 and 9 are operation explanatory views of the brake arm when the first cassette is mounted. In the state shown in FIG. 7, the pin 51a provided on the brake arm 8a is in contact with the stopping area 62 of the slide cam 12a. The brake arms 8a are in contact with each other, and the tension spring 9a is stretched by rotating the shaft 7a pivotally supporting the brake arm 8a so that the brake pad 10a is separated from the reel base 6a. Does not generate braking force. On the other hand, a pin 51b provided on the brake arm 8b
Is separated from the slide cam 12b, the brake pad 10b is pressed against the reel base 6b by the pulling force of the tension spring 9b, and a predetermined braking force is generated on the reel base 6b. In this state, a braking force is generated only on one reel stand, which corresponds to the operation of pulling out the magnetic tape 22 from the cassette.

As the cam gear 18 shown in FIG. 4 is rotated by the loading motor (not shown) from the state of FIG. 7, the drive arm 17 is rotated and the lever 16 is moved in the direction B in the figure. Then, the slide cams 12a, 12
Since b is engaged with the lever 16 by the arms 14 and 15, respectively, b moves from the state shown in FIG. 7 to the state shown in FIG. In the state of FIG. 8, the pins 51a and 52b abut the stop regions 62 and 63 of the slide cams 12a and 12b, respectively, and the tension springs 9a and 9b are stretched. Therefore, the brake pads 10a and 10b are the reel stands 6a and 6b.
Therefore, no braking force is generated on the reel stands 6a and 6b. In this state, no braking force is generated on both reel bases, which corresponds to recording / reproducing on the magnetic tape 22.

Further, as the cam gear 18 shown in FIG. 4 further rotates, the drive arm 17 is further rotated and the lever 1 is rotated.
6 is moved in the B direction in the figure compared to the state of FIG. Then, the slide cams 12a and 12b move from the state shown in FIG. 8 to the state shown in FIG. In the state shown in FIG. 9, the pins 51a and 52b are attached to the slide cams 12a and 12 respectively.
Since it is separated from b, the brake pads 10a and 10b are pressed against the reel stands 6a and 6b by the pulling force of the tension springs 9a and 9b. Therefore, the reel stand 6a,
Braking force is generated in both 6b. This state corresponds to the stop of the magnetic tape 22.

As described above, the slide cams 12a, 12b
Can be switched in synchronism with the cam gear 18 to generate or not generate the braking force on the reel bases 6a and 6b. Further, FIG. 10 shows a reel stand base 4
The case where a and 4b are set at the positions corresponding to the second cassette is shown, and the slide cams 12a and 12b have stop regions 64 and 65 at positions corresponding to the stop regions 62 and 63.
Is provided. Therefore, even if the reel bases 6a and 6b move to the positions corresponding to the second cassette, the sliding cams 12a and 12b are moved in synchronization with the cam gear 18 to generate a braking force on the reel bases 6a and 6b as before. It can be switched whether to cause or not to generate.

As described above, in this embodiment, the first
Pair of reels that move on the chassis so as to move the reel base to a position corresponding to the reel interval of the first cassette when the second cassette is used, and to a position corresponding to the reel interval of the second cassette when the second cassette is used. Stand base,
Brake arms pivotally supported by shafts which are respectively planted on the pair of reel bases, a brake pad attached to one end of these brake arms, and a pair of slides slidably supported on the chassis. A brake cam is provided with a cam so that the brake pad directly contacts and separates from the reel stand by the slide cam contacting and separating from one end of the brake arm regardless of whether the pair of reel stand bases is in the first or second position. With this configuration, even if the reel stand moves corresponding to a cassette having a different reel interval, the braking force can be directly applied to the reel stand and the tape can be reliably stopped.

Further, the slide cam is provided with a stop area corresponding to a plurality of positions where the brake pad is brought into contact with both of the reel bases, separated from both of them, or brought into contact with either one of them. With the configuration for establishing the above position, the contact and separation operations of the brake pads can be performed independently.

Further, in the present embodiment, the brake pad is brought into contact with either one of the pair of reel stands by a combination of a pair of slide cams that move the brake arms together with the reel stand base corresponding to a plurality of cassettes and drive the brake arms. You can choose. In the present embodiment, the size of the cassette has been described as two types. However, if the number of combinations of the stop areas of the slide cams is increased, it is possible to support cassettes of three or more sizes, and it is not necessary to use only two types of cassettes. The arrangement of the stopping area on the slide cam is not limited to the above example.

Example 2. 11 to 13 show a reel stand brake mechanism according to another embodiment of the present invention.
1 and 12 are operation explanatory views of the reel stand base, and FIG. 13 is a side view of a main part.

In FIG. 11, 1 is a chassis, 70a, 7
0b is a spring hook portion provided on the chassis 1, 71
Reference characters a and 71b are spring suspension portions provided on the reel bases 4a and 4b, respectively. As shown in FIG. 13, 72a is a torsion spring suspended between the brake arm 8a and the spring suspension portion 70a. The brake arm 8b shown in FIG.
The torsion spring 72b and the spring suspension portion 70b have the same structure as the brake arm 8a, the torsion spring 72a, and the spring suspension portion 70a, and the torsion spring 72b is suspended between the brake arm 8b and the spring suspension portion 70b. . The other structure is the same as that of the reel stand brake mechanism of the first embodiment.

Next, the operation will be described. The state shown in FIG. 11 is a case where a large-sized first cassette is mounted, and the reel bases 6a and 6b are set at the positions corresponding to the first cassette as in the operation shown in FIG. 5 of the first embodiment. To be done. At this time, one end of the torsion spring 72a is attached to the spring suspension portion 7
0a and a predetermined biasing force is applied to the brake arm 8a.
Is given to. Similarly, the brake arm 8b receives a predetermined biasing force by the torsion spring 72b. Therefore, by sliding the slide cams 12a and 12b, the brake pads 10a and 10b can be pressed against the reel bases 6a and 6b to generate a predetermined braking force on the reel bases, as in the first embodiment.

Next, when mounting the second small cassette, the reel base 4 is mounted in the same manner as in the first embodiment.
a and 4b move along the guide rails 2a and 2b, and
The state shown in 2 is reached. In the state of FIG. 12, one end of the torsion spring 72a is separated from the spring suspension portion 70a by the movement of the reel base 4a and engages with the spring suspension portion 71a provided on the reel base 4a. In this state, the arm opening angle of the torsion spring 72a is smaller than that in the state in which the first cassette in FIG. 11 is mounted, and the biasing force applied to the brake arm 8a is small.

Therefore, the braking force when the slide cam 12a is slid to press the brake pad 10a against the reel base 6a is smaller than that when the first cassette is mounted.

The same applies to the brake arm 8b, the torsion spring 72b, and the spring suspension portion 71b.
Thus, the braking force applied to the reel stand 6b is smaller than that when the first cassette is mounted.

That is, the reel base is moved to a position corresponding to the reel interval of the first cassette when the first cassette is used, and to a position corresponding to the reel interval of the second cassette when the second cassette is used. A pair of reel bases that move around, a brake arm pivotally supported by shafts planted in each of the pair of reel bases, a brake pad attached to one end of these brake arms, and brakes for these brakes. A spring for biasing the pad against the reel stand, a spring suspension portion for engaging one end of these springs (twisting springs), and a pair of slide cams slidably supported on the chassis. The slide cam can be brought into contact with and separated from one end of the brake arm regardless of whether the pair of reel bases is in the first or second position. The brake pad separates from and abuts the pair of reel bases, and the biasing force of the spring (twisting spring) is changed depending on whether the reel base is in the first position or the second position. This makes it possible to apply the braking force directly to the reel stand even when the reel stand moves corresponding to a cassette having a different reel spacing, and the braking force can be changed according to the size of the cassette, so that the tape can be used appropriately. It can be reliably stopped by the braking force.

As described above, in the present embodiment, a brake pad is moved to a pair of reel stands by a combination of a pair of slide cams that move the brake arms together with the reel stand base in correspondence with a plurality of types of cassettes. It is possible to select whether or not to abut, and it is possible to switch the pressing force of the brake pad depending on the moved position of the reel base.

[0049]

As described below, according to the reel stand brake mechanism of the first aspect of the present invention, even if the reel stand moves corresponding to a cassette having a different size, the reel stand is connected by the operation of the pair of sliding cams. There is an effect that the member is driven to bring the contact member into contact with or separate from the reel base to surely apply a braking force to the reel base as necessary.

According to the reel stand brake mechanism of the second aspect of the present invention, even if the reel stand moves corresponding to a cassette having a different size, the connecting member is driven by the operation of the pair of sliding cams and the abutting member. Is brought into contact with or separated from the reel stand to reliably apply a braking force to the reel stand, and a stop area is provided on the pair of sliding cams, so that the contact member can be brought into contact with or separated from the pair of reel stands. There is an effect that can be selected.

According to the reel stand brake mechanism of the third aspect of the present invention, even if the reel stand moves corresponding to the cassettes of different sizes, the connecting member is driven by the operation of the pair of sliding cams. Is brought into contact with or separated from the reel base to surely apply a braking force to the reel base as necessary, and the pressing force at the time of contact of the contact member with the reel base is changed depending on the position of the pair of reel bases. , There is an effect that an appropriate brake torque can be selected according to cassettes of different sizes.

[Brief description of drawings]

FIG. 1 is a front view showing a first cassette mounted in a first embodiment of the present invention.

FIG. 2 is a front view showing the second cassette mounted in the first embodiment of the present invention.

FIG. 3 is a side view of a main part according to the first embodiment of the present invention.

FIG. 4 is a perspective view of a main part according to the first embodiment of the present invention.

FIG. 5 is an operation explanatory diagram according to the first embodiment of the present invention.

FIG. 6 is an operation explanatory view in the first embodiment of the present invention.

FIG. 7 is an operation explanatory diagram according to the first embodiment of the present invention.

FIG. 8 is an operation explanatory diagram according to the first embodiment of the present invention.

FIG. 9 is an operation explanatory diagram according to the first embodiment of the present invention.

FIG. 10 is an operation explanatory diagram according to the first embodiment of the present invention.

FIG. 11 is an operation explanatory diagram of the second embodiment of the present invention.

FIG. 12 is an operation explanatory diagram of the second embodiment of the present invention.

FIG. 13 is a side view of a main portion according to the second embodiment of the present invention.

FIG. 14 is a first view of a conventional reel stand brake mechanism.
FIG.

FIG. 15 is a second view of the conventional reel stand brake mechanism.
FIG.

FIG. 16 is a side sectional view of a main part of a conventional reel stand brake mechanism.

[Explanation of symbols]

1 chassis, 4a, 4b reel base, 6a, 6
b reel stand, 8a, 8b brake arm, 10a,
10b brake pad, 12a, 12b slide cam, 21 first cassette, 62, 63 stop area, 70
Second cassette.

Claims (3)

[Claims] 1. A reel base brake mechanism comprising a pair of reel bases and a mechanism for holding the space between the pair of reel bases at a predetermined distance. Each of the pair of reel bases is movable on a base. A pair of reel stand mounting base to be mounted,
A pair of connecting members attached to each of the pair of reel bases, a pair of contact members attached to each of the pair of connecting members, and sliding on the base. A pair of sliding cams supported so that at least one of the pair of abutting members is attached to the pair of reel bases in accordance with the operation of the pair of sliding cams. A reel stand brake mechanism characterized in that it comes into contact with or separates from one another. 2. The reel according to claim 1, wherein at least one of the pair of sliding cams is provided with a stop region to control the operating state of the contact member. Platform brake mechanism. 3. The pressing force of at least one of the pair of abutting members is changed according to the position of the pair of reel bases.
The reel stand brake mechanism described.