JPS61104360A - Tape loading mechanism - Google Patents

Abstract

PURPOSE:To reduce the number of parts by placing a driving lever and a loading ring so that teeth formed on a part of the outside of the driving lever which is coupled to a regulator lever through a pin and teeth formed on a part of the outside peripheral surface of the loading ring can be engaged with each other. CONSTITUTION:Teeth 11 are formed on a part of the outside peripheral surface of a loading ring 1, and a loading ring guide roll 2 is rotatable around a pin 21. A regulator lever 3 is rotatable around a pin 31 and is provided with an engaging pin 33. A hole 51 which should be engaged with the pin 33 is formed on a driving lever 5, and teeth which should be engaged with teeth 11 are formed on a part of the outside. Positions of rotation centers of the ring 1 and the lever 5 are so set that both teeth can be engaged with each other. Thus a tape 4 is positioned with a small number of parts.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tape loading mechanism of a magnetic recording device using tape, such as a VTR, and particularly to a mechanism for pulling out a regulator lever, which is a part of the tape loading mechanism.

[Conventional technology]

For VTRs, the position of the regulator lever and tape positioning member differs depending on the mode (play, injector, etc.).

For this reason, a mechanism has been conventionally proposed in which the regulator lever is actuated in synchronization with the movement of the tape positioning member.

For example, a method of driving a regulator lever (called a tensile arm in the published practical application 1986-65665) and a tape positioning member (also called a loader) by a cam is disclosed in the published practical application 1986-65665. There is one.

[Problem that the invention seeks to solve]

In the prior art described above, a cam or a lever is disposed between the drive member of the tape positioning member and the drive member of the regulator lever. For this reason, firstly, the number of parts increases, which poses problems in terms of parts cost and ease of assembly. In particular, since the cam has a complicated shape, it is generally manufactured using a molding method such as plastic or aluminum die-casting, which is expensive.
There is an intermediate member such as a cam or a lever between the drive member of the tape positioning member and the drive member of the regulator lever. Manufacturing errors in these intermediate members, shape errors due to wear, and backlash in the connecting portions increase the periodic deviation in the operation of the tape positioning member and the regulator lever.

[Means for solving problems]

The tape loading mechanism according to the present invention includes a loading ring, a mechanical servo type tension regulator mechanism, and a drive lever that shares a rotation center with the regulator lever that is a part of the tension regulator device 4 (4). A part of the outer circumference of the drive lever is formed into a KtM shape, and the distance between the rotation center of the loading ring and the drive lever is set so that the two tooth profiles can be anastomosed. A hole is provided on one side and a pin that engages with the hole is provided on the other side.

[Operation] When the loading ring rotates a certain amount, the tooth profile provided on a part of the outer periphery begins to engage with the tooth profile of the drive lever. When the loading ring further rotates, the drive lever follows,
The regulator lever, which is pre-engaged with the pin and hole, is also actuated. When the engagement period between the tooth profiles ends, the drive lever and the regulator lever stop rotating and are positioned.

The loading ring can rotate with the tape positioning member even after the engagement period ends.

The above operation is the same whether the loading ring is rotated in the forward or reverse direction.

〔Example〕

FIG. 1 is a plan view showing the basic state of an embodiment of the present invention.

Figures 2-α and b are cross-sectional views of Figure 1.

FIG. 5 shows the half-load state of the present invention.

FIG. 4 shows a state in which the tooth profile formed on a portion of the loading ring and the tooth profile of the drive lever have finished meshing and the drive lever has been positioned.

The configuration and operation of the present invention are shown below.

Reference numeral 1 denotes a loading ring, and a round shape 11 is formed on a part of the outer periphery. Reference numeral 2 denotes a loading ring guide roller which can rotate around a pin 21.

3 is a regulator lever rotatable around a center pin 51, and a boss 62. Engagement pin 35. Band fixing lever pin 34. A tension spring 35 is attached.

Note that the band fixing lever 36 is rotatably attached to the band fixing lever pin 54. 4 is a tape. 5 is a drive lever, which in cross section is the regulator lever 5.
and chassis O. The drive lever 5 has an engaging bit/3
hole 51 for engaging with 6. A connecting pin 529 for driving the connecting lever 7 and a regulating spring 8 for regulating the movement of the regulator lever 3 are attached. Note that the connecting pin 52 extends through the chassis 6 to the back side, and a drive lever spring 53 is hooked on the back side of the chassis. The regulating spring 8 is provided with a bent portion 81, and this bent portion 81 is inserted into the circular arc hole 62 of the chassis 6. A perpendicular pin 61 is also provided on the chassis 6, and the perpendicular pin 61 passes through an elongated hole 71 of the connecting lever.

10 is a band brake, and 20 is a supply reel stand.

Next, the operation will be explained.

FIG. 1 shows the basic state of the present invention, ie, a period when no tape is inserted, and a state immediately after the tape is inserted but before the loading ring 1 is driven by a motor (not shown).

In this state, a clockwise moment is applied to the FJA'My lever 5 by the drive lever spring 53 applied to the connecting pin 152. This moment is
2, one side of the elongated hole 71 of the connecting lever 7 hits the perpendicular pin 61 and is positioned. Note that the perpendicular pin 61 also serves as a tape cassette (not shown).

The engagement pin 33 of the regulator lever is inserted into the engagement hole 51 of the fnM lever. Further, a regulating spring 8 is in contact with the engagement pin 53, which rotates the entire regulator lever to the left and presses the retaining pin 53 against the wall of the retaining hole 51 to position it.

A band brake 10 for braking the supply reel 20 is attached to the band fixing lever 36 on the opposite side of the band fixing lever pin 54.

The tension spring 35 is a tension spring and applies a counterclockwise moment to the regulator lever 5 and the drive lever 5. However, the magnitude of the moment depends on the drive lever spring 5.
It is smaller than the clockwise moment due to 3.

From the above state, the loading ring starts to rotate clockwise by a motor (not shown), for example, via a loading gear (not shown) stacked on the loading ring.When the loading ring starts rotating, the end of the tooth profile 11 The tooth profile 111 at the end of the drive lever 5 first engages with the tooth profile 54, which is longer than the tooth profile h5, 5 in the center, and the drive lever 5 and the regulator lever 5 begin to rotate.

The tooth profile 54 at the end of the drive lever is longer than the tooth profile 55 at the center, and there is a gap between the tooth profile 54 and the tooth profile 55 at the end of the loading ring tooth profile 111. The locking length is increased to ensure stable operation despite variations in the shape and position of parts.

FIG. 3 shows a state in which the drive lever 5 and the regulator lever 3 are partially driven by the loading ring 1.

In some small VTRs, the tape must not come into contact with the tape inlet/outlet of the tape cassette while it is running. In this case, the tape must be pulled out of the tape cassette before fast-forwarding or rewinding. This state is called a half-load state and is traced in FIG.

When the tape 4 runs in the state shown in FIG. 3, a clockwise moment is applied to the regulator lever via the post 32 due to the tape tension.

However, the regulating spring 8 applies a counterclockwise moment larger than the moment due to the tape tension via the engagement pin 35, and the engagement pin 33 does not separate from the left wall of the engagement hole 51.

Further, the drive lever 5 as a whole does not move because its position is determined by the meshing of the tooth profiles. Therefore, fast-forwarding and rewinding of the tape is performed with a predetermined boss position secured.

Figure @4 shows the state immediately after the two tooth profiles have finished meshing.

In FIG. 1, a clockwise moment is applied to the drive lever by the drive lever spring 55, but in FIG. 4, a counterclockwise moment is applied.

This moment is calculated by the hole 7 of the connecting lever as in the case of Figure 1.
1 and is canceled and positioned by a per-degree pin 61. On the other hand, the bending portion 81 of the regulating spring 8 is determined to be in contact with the wall of the circular arc hole 61 of the chassis. This adjustment of the regulating spring releases the engagement pin 33 from being pressed against the wall of the engagement hole 51, and the regulator lever 6 is released from interlocking with the drive lever 5 within the range of the engagement hole.

On the other hand, the band fixing lever 56 is moved to the left by the movement of the regulator lever 3 in the state shown in FIG. 1, so that the belt brake 10 is wound around the supply reel 2o without any gaps, and the brake is ready to be applied.

If the loading ring 1 is further rotated clockwise from the state shown in FIG. 4, the tape positioning member provided on the loading ring will eject the tape to a state where it can run. After this, when the tape is actually run, the same operation as a normal tape tension adjustment mechanism is performed by rotating the tension spring, belt brake, and regulator lever.

The post 9 is used to prevent the tape 4 pulled out by the regulator lever post 62 from coming into contact with the tape outlet of a tape cassette (not shown), and is suspended from above by a lever (not shown). .

Returning from the tape running state to the state shown in FIG. 1 involves following the above-mentioned sequence in reverse. The operation when the two tooth profiles resume meshing is exactly the same as that described in FIG.

〔effect〕

First, since the drive member of the tape positioning member and the drive member of the regulator lever are directly engaged, the number of parts is small, and the cost and ease of assembly are excellent. In addition, this meshing equipment can be made, for example, by pressing plate materials, and the manufacturing cost is low.Secondly, in the mechanism according to the present invention, the parts are always pressed by springs, so any looseness at the connecting points is always eliminated. It is being Further, since there are no other parts between the FJA moving member of the tape positioning member and the driving member of the regulator lever, the tape positioning member and the regulator lever will not be out of synchronization. Therefore, if the parts are manufactured, there is no need for an adjustment mechanism, the structure is simple, and there is no need for an adjustment process.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the basic state of the present invention. Figures 2-α and b are cross-sectional views of Figure 1. FIG. 5 is a plan view showing the tape loading mechanism 4 in a half-loaded state according to the present invention. FIG. 4 is a plan view showing a state in which the tape loading mechanism according to the present invention has finished operating. 1... Loading ring 10...
... Bunt brake 11 ... Loading ring tooth profile 111 ...
・One tooth at the end of the tooth profile of the loading ring 2 Loading ring guide roller 2
0... Supply reel 21... Pin 5... Regulator lever 51...
... Center pin 52.9 ... Post 55 ... Engagement bin 34 ... Band fixing lever pin 55 ...
・Tensile tension lever 56... Bunt fixing lever 4... Tape 5... m Dynamic v, p<-51...
...Engagement hole 52...Connection pin 55...Drive lever spring 54...Tooth profile longer than the others 55...Tooth profile 6 in the center... ...... Chassis 61 ... Percentage bottle 62 ... Arc hole 7 ... Connection lever 71 ... Length of connection lever Hole 8...Regulation spring 81...More than the bent part of the regulation spring

Claims (1)

[Claims] It consists of a loading ring, a mechanical servo type tension regulator mechanism, and a drive lever that shares a rotation center with the regulator lever that is part of the tension regulator mechanism, and includes a part of the outer circumference of the loading ring and a part of the outer shape of the drive lever. A tooth profile is formed on the drive lever, and the distance between the rotation centers of the loading ring and the drive lever is set so that the two tooth profiles can mesh with each other, and the drive lever or the regulator lever engages with a hole on one side and the hole on the other. A tape loading mechanism characterized by a pin.