JPS5823669B2 - Cassette for magnetic recording/reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cassette for a magnetic recording/reproducing device.

Various loading systems have been proposed for conventional magnetic recording and reproducing devices, but most of them involve a method of pulling out the tape from a cassette and loading the magnetic tape into a rotating head cylinder, and none of them involve a method of not pulling out the magnetic tape. was equal to

In addition, the method of pulling out the tape inevitably requires loading time, and the tape running path in a magnetic recording/reproducing device is complicated because the magnetic tape must be wound diagonally around a rotating head cylinder more than half a turn. Therefore, damage to the magnetic tape and loading mistakes are very likely to occur while pulling out the magnetic tape.To solve the above problems, various safety measures are required, and the mechanical mechanism is also quite complex. There are many problems that need to be solved that recorders do not have.

The present invention eliminates the above-mentioned drawbacks and provides a magnetic recording and reproducing device that can easily and reliably automatically load a magnetic tape by providing a band guide made of a very simple elastic material in the cassette without tape loading. This is what I am trying to do.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic plan view of a cassette according to an embodiment of the present invention. Reference numeral 1 indicates a cassette case body, and the hatched portion is a visible portion of the bottom plate of the cassette body.

2 and 3 are when this cassette is installed in the magnetic recording and reproducing device main body,
These are round holes and oblong holes for positioning the cassette.

4 indicates two magnetic heads (not shown) when this cassette is installed.
This is a round hole drilled to accommodate a rotating head cylinder with a built-in rotary head cylinder, 5 is a cutout hole for a pinch roller and capstan to fit in, and 6 is a cutout hole for a tension pole to fit in.

Similarly, 7 and 8 are round holes for inserting the tapered guide pole of the main body of the magnetic recording/reproducing device, and on the left side of 7 and on the right side of 8,
Arc-shaped tape holders 9 and 10 are provided, respectively, to hold the tape.

Further, 11, 12, 13° 14 indicate tape guide poles, and 15° 16 indicates a tape guide roller.

Reference numeral 17 indicates a magnetic tape, which is indicated by a dashed line in FIG.

Reference numeral 18 denotes a band guide made of an elastic body, which is the most characteristic feature of the present invention, and is housed in a U-shape by a guide holding groove (shown in FIG. 8 as an example), and one end of the band guide 18- A has a cylindrical shape into which a connecting rod (described later) on the device main body side is inserted.

19 is a notch into which the connecting rod is inserted.

FIG. 2 is a sectional view taken along the line AA' in FIG. 1, and the reel has a double structure.

20 indicates a supply reel, and 21 indicates a take-up reel.

FIG. 3 is a schematic plan view showing the state in which the magnetic recording and reproducing device is installed in the main body, and 22 is a rotary head cylinder;
' indicates a cylinder holder, 23 is a capstan, and 24 is a pinch roller, both of which are installed on both sides with the magnetic tape 17 in between, so that the magnetic surface of the magnetic tape comes into contact with the capstan. It is located.

25 is a voice control head, and 26 is an erase head.

27 and 27' indicate positioning shafts, which are inserted into the round hole 2 and the oblong hole 3.

Reference numerals 28 and 29 indicate tape vertical regulation guide poles, which are arranged near the entrance and exit of the rotary head cylinder 22.

Taper poles 30 and 31 are placed in the round holes 7 and 8, with 30 being the upper side and 31 being the lower side.

Note that the tapered poles 30.degree. 31 have sharp tips so that the magnetic tape 17 can be separated from the arc-shaped tape holder 9.10.

This state is shown in FIG. Reference numeral 32 indicates a tension pole provided to keep the tape tension constant, and is inserted into the notch hole 6.

33 is a band guide pull-out drum, which is rotatable around a shaft 34.

A band guide connecting rod 35 having an L-shaped tip is provided on the lower surface of the band guide pull-out drum 33 and is rotatable.

In FIG. 3, the tip of the band guide connecting rod 35 is fitted into one end 18-a of the band guide 18.
The belt guide connecting rod 35 is connected to the belt guide connecting rod 35.

Further, 33-a is a notch into which the cylindrical portion of one end portion 18-a of the band guide enters.

36 is a threading guide for preventing the band guide 18 from escaping outside during unthreading.

Next, to explain the state of the magnetic tape 17, the supply reel stand 2
The magnetic tape that came out from the tape guide pole 11.1
2. After passing through the roller guide 15 and the tapered pole 30 and reaching the band guide 18, and going half way around the outer circumferential surface of the band guide 18,
The tape is wound onto the winding wheel 21 via the tapered pole 31, the roller guide 16, and the tape guide poles 13 and 14.

FIG. 4 is a schematic plan view showing the play running state, in which the magnetic tape 17 is advancing in the direction of the arrow on the dashed line, coming out from the supply reel 20, passing through the guide pole 11, the tension pole 32, and the guide hole 12. , the erasing head 26, the guide roller 15, the tapered pole 30, the tape vertical regulation guide pole 28, and then the rotating head cylinder 22.
Then, it goes half a circle around the rotating head cylinder 22, passes through the vertical regulation guide pole 29, the taper pole 31, the guide roller 16, the voice control head 25, the guide pole 12, and then the capstan 23 and the pinch roller 2.
4, passes through the guide pole 14, and is wound onto the take-up reel 21.

In the case of tape fast forwarding, in FIG. 4, the pinch roller 24 separates from the capstan 23 and moves the magnetic tape 17 in the same direction as the magnetic tape traveling direction during playback.
is sent out from the supply reel 20 and taken up on the take-up reel 21.

In the case of rewinding, the magnetic tape 17 comes out from the take-up reel 21 and is wound onto the supply reel 20, which is completely opposite to the fast forwarding.

Further, in the play, fast forward, and rewind states, the band guide 18 is wound around the band guide pull-out drum 33, as shown in FIG. 4, and is completely separated from the magnetic tape 17.

The broken lines in FIG. 4 indicate the positions of the erasing head 26, the audio control head 25, the pinch roller 24, the tension pole 32, and the band guide 18 when they are in the state shown in FIG. 3, that is, when the cassette is installed.

FIG. 5 is a schematic side view of the state shown in FIG. 4, with the side plate removed.

Figure 6 is shown in Figure 4. belt guide drawer drum 33
2 is a perspective view of the vicinity of the belt guide 18, in which the belt guide 18 is wound around the outer periphery of the belt guide pull-out drum 33 inside the threading guide 36.

Further, the tip of the band guide connecting rod 35 is fitted into one end 18-a of the band guide 18, and is housed in the notch 33-a of the band guide pull-out drum.

FIG. 7 is a perspective view of the band guide pull-out drum 33 in FIG. 3.

FIG. 8 is a sectional view showing an example of the band guide holding groove.

Figure 9 shows the taper point. - It is a perspective view showing the outline of rule 31, and the tip is cut diagonally.

FIG. 10 is a perspective view showing the state of FIG. 3.

Next, the tape loading operation based on the structure described above will be explained.

First, cassettes are magnetically recorded. When the magnetic tape 17 is separated from the main body of the raw equipment, it is as shown in FIG. 15, through tape holder 9.

Around half the outer circumference of the band guide 18, tape holder 10 tape guide roller 16, tape guide pole 13,1
4, and is wound onto the lower reel of the two-tiered reel, that is, the take-up reel 21.

Video the cassette in this state. Attach it to the tape recorder body.

When installing, rotate head cylinder 22, pinch roller 24, capstan 23, tension pole 32,
Tape vertical regulation guide 2B, 29, taper pole 30
．． The cassette positioning shafts 27, 27 are inserted from above into the respective defined notches or through holes.
' is positioned.

A diagram of the state in which the cassette is attached is shown in FIG.

In this state, the band guide connecting rod 35 is connected to the band guide 18.
It is fitted into the cylindrical portion of one end portion 18-a.

Next, when the band guide drawer drum 33 is rotated once clockwise, the band guide 18 that has been positioned around the rotary head cylinder 22 is moved to the band guide drawer drum 33.
is transferred and wrapped around the outer circumference of the

That is, the band guide 18 is in a state as shown in FIG.

In this state, the magnetic tape 17 is not yet in contact with the rotary head cylinder 22.

Next, the take-up reel 21 starts rotating, and then the pinch roller 24 comes into pressure contact with the capstan 23, and the erasing head 26
, voice control head 25, tension pole 32
moves from the position indicated by the broken line to the position indicated by the solid line in FIG.

In this state, due to the constant rotational movement of the capstan 23, the magnetic tape 17 comes out from the supply reel 20 in the direction of the arrow, and moves through the guide pole 11, tension pole 32, guide pole 12, erasing head 26, roller guide 15, and taper pole. 30, go half way around the rotary head cylinder 22 via the vertical regulation guide 28, pass the vertical regulation guide 29, taper pole 31, roller guide 16, voice control head 25, guide pole 12, and then the capstan 23.
, and the pinch rollers 24, and is taken up by the take-up reel 21 via the guide pole 14 and begins to move at a constant speed.

When performing fast forwarding or rewinding, the tape running path is the same as the above-mentioned play running, but the pinch roller 24 is separated from the capstan 23, and the tension pole 32, audio control head 25, and erasing head 26 are also magnetically moved. The tape is separated from the tape (as indicated by the broken lines in FIG. 4), and the tape is fed at high speed.

The magnetic tape 17 moves from the supply reel 20 to the take-up reel 21 in the case of fast forwarding, and vice versa in the case of rewinding.

The first driving method will be omitted.

Next, the operation when the cassette is removed from the main body of the video tape recorder after playing, fast forwarding, rewinding, etc. is completed will be explained.

When the play is finished, the pinch roller 2 is
4 is separated from the capstan 23, and includes a voice control head 25, an erasing head 26, and a tension pole 32.
is separated from the magnetic tape 17.

In this state, by rotating the band guide pull-out drum 33 counterclockwise, the band guide 18 is moved between the vertical regulation guide 29 and the tapered pole 310 while being regulated by the band guide holding groove (FIG. 8) in the cassette. and is transferred around the rotating head cylinder 22.

That is, the state is as shown in FIG.

Further, when the band guide pull-out drum 33 rotates counterclockwise, a reaction force acts on the other end of the band guide 18, and a force that tries to separate the band guide 18 from the outer circumferential surface of the band guide draw-out drum 33 is exerted on the band guide 18. This makes it difficult for the other end of the band guide 18 to exert a force to enter the cassette.

However, here, a threading guide 36 is provided around the band guide drawer drum 33, and if the band guide drawer drum 33 is rotated counterclockwise,
A forward force is automatically applied to the cassette entrance portion of the band guide 18, and the band guide 18 enters the cassette, and when the band guide pull-out drum 33 has rotated once, the state as shown in FIG. 3 is reached.

That is, the magnetic tape 17 has moved from around the rotating head cylinder 22 to around the band guide 18.

In this state, the cassette can be removed from the video tape recorder body.

As described above, according to the present invention, magnetic tape can be automatically loaded easily and reliably by providing a band guide made of an elastic body with a very simple structure inside the cassette.

[Brief explanation of the drawing]

1 to 10 are schematic diagrams showing one embodiment of the present invention, and FIGS. 1, 3, 4, and 10 are diagrams with the top plate removed. Fig. 1 is a schematic plan view of the cassette, Fig. 2 is a sectional view taken along line AA' in Fig. 1, Fig. 3 is a schematic plan view of the cassette installed in the main body of the magnetic recording/reproducing device, and Fig. 4 is the same device. Fig. 5 is a schematic side view of the state shown in Fig. 4 with the side plate removed, and Fig. 6 is a schematic plan view showing the playing state with the cassette attached to the main body. Perspective view of the vicinity, No. 7
The figure is a perspective view of the belt guide drawer drum in Figure 3;
Figure 8 is a sectional view showing an example of the band guide holding groove, Figure 9 is a perspective view schematically showing the taper pole, and Figure 10 is a perspective view of Figure 3, with the right side plate removed. This is a diagram. 1...Cassette case body, 15, 16...
... Tape guide roller, 17 ... Magnetic tape, 18 ... Band guide, 20 ... Supply reel, 21 ... Take-up reel, 22 ... ...
... Rotating head cylinder, 23 ... Capstan, 24 ... Pinch roller -125 ...
...Voice control head, 26... Erasing head, 30, 31... Taper pole, 32.
...Tension pole, 33... Band guide drawer drum, 35... Band guide connecting rod, 36... Threading guide.

Claims (1)

[Scope of Claims] 1. A cassette case provided with a through hole or notch into which the rotating head cylinder, capstan, pinch roller, tape guide hole, audio control head, erasing head, etc. of the main body of the magnetic recording/reproducing device are inserted. In the main body, a supply reel and a take-up reel are disposed within the main body, and a band guide made of an elastic material is slidably disposed along the outer periphery of the through hole or notch for the rotating head cylinder. 1. A cassette for a magnetic recording and reproducing device, characterized in that when the cassette is mounted on a rotary head cylinder, the band guide is transferred and a magnetic tape is loaded from the band guide onto the outer periphery of a rotary head cylinder. 2. A patent set characterized in that the supply reel and the take-up reel are arranged in a double layered manner. 3. The belt guide according to claim 1, wherein the band guide is housed in a guide holding groove provided in the cassette case body along a through hole or notch for a rotary head cylinder in the cassette case body. Cassette for magnetic recording and reproducing equipment. 4. The magnetic recording and reproducing device according to claim 1, wherein the band guide is connected to a band guide connecting rod at one end and transported out of the cassette case main body when the band guide is attached to the device main body. .