JPS5818689B2 - Tape recorder notebook tape cassette switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a detection device for a tape recorder that detects a tape cassette in which the number of tape wraps on a tape bubble is counted and managed in advance.

Generally, the recording and playback time of a cassette tape is constant, such as minutes round trip, and if the tape length is constant, this time can be detected by counting and managing the number of rotations of the tape bubble.

For example, for a cassette tape that takes 60 minutes to round trip, the number of times the tape bubble rotates and the number of rotations and minutes required can be easily calculated, and the time can be managed based on the number of rotations.

Therefore, it is easy to manage a predetermined time by counting and managing the number of rotations of the tape bubble corresponding to a predetermined time.

By managing this, it is possible to issue a notice or warning that the tape is about to end or has reached the end.

It goes without saying that for cassette tapes used under such counting control, the number of windings must be accurately counted in advance when the tape is wound into a cassette.

FIG. 1 shows an example of a tape winding mechanism for winding such a tape T onto a tape bubble of a cassette.
The tape is wound around a cassette tape tube 1, and the drawn end is fed out by a capstan 2 and a pinch roller 3, and wound onto a cassette tape bubble 4.

A winding shaft 5 that rotationally drives the tape bub 4 is connected to a motor (not shown) and controls the tape winding torque of a tape recorder (not shown), that is, PLAY, FF,
It rotates and winds up the tape T with a torque close to the tape winding torque during operations such as REW.

A tape cutter 9 is disposed between the capstan 2 and the tape bub 4 for cutting the tape T stretched by the tape guide 7.8.

The Conotape winding mechanism normally counts the number of rotations of the capstan 2 with a counter, and when the counter (not shown) reaches a predetermined value, a switch (not shown) of the motor that drives the winding shaft 5 is activated. ) is released, the brake is operated, the motor suddenly stops, the stopped tape T is cut by a cutter 9, and a fixed length of tape is wound around the tape bubble 4.

However, in the tape used in the present invention, instead of counting the number of revolutions of the capstan 2 described above,
The amount of tape to be wound is controlled by counting the number of rotations of the tape, and the tape is wound onto the tube 4 by an accurate fixed length.

The configuration of this winding section is as shown in FIG. 2.

Below the knob holder 10 of the tape knob 4 that engages with the take-up shaft 5, a disc 11 having at least one small hole 12 in the periphery 9 is integrally attached to the take-up shaft 5. I was being treated,
A small lamp 14 that is lit by a power source 13 and a light receiving element 15 such as a photoelectric conversion element or a phototransistor are disposed above and below the movement path of the small hole 12 of the disk 11, facing the small hole 12. has been done.

In this way, when the disc 11 rotates due to the rotation of the winding shaft 5, a current is generated through the light receiving element 15 every time the small hole 12 of the disc 11 passes between the lamp 14 and the light receiving element 15. Pulses are generated that correspond to the number of rotations of the winding shaft 5 and the number of small holes 12 in the disc 11.

This pulse is amplified by an amplifier 16 and counted by operating an electromagnetic counter 17.

That is, when there is only one small hole 12 in the disk 11, one pulse is generated every time the winding shaft 5 rotates once, and the electromagnetic counter 17 counts by one.

In the above example, a small lamp 1 is used for nollus generation.
4 and a light-receiving element 15, but instead of this, as shown in FIG. You can also make it occur,
Further, as shown in FIG. 3B, a non-conductive cylinder 22 having a conductive piece 22a attached to a part of its circumferential surface is fixed to the winding shaft 5, and two pieces are attached to the cylinder 22.

Pulses may be generated by combining the conductive brushes 23.

As shown in FIG. 2 and FIG. 4, the electromagnetic counter 17 has a specific cam and a switch for each digit of the counter, and only when each digit reaches a specific number, a switch is activated. correspondence.

The normally open switches 36 to 34 are rotated by rotating cams 31 to 34 to
39 is now closed.

That is, the cams 31 to 34 are fixed on a rotating shaft 35 together with number wheels for the first to fourth digits, respectively, and the switches 136 to 39 are closed by these cams 31 to 34.
are connected in series.

Then, only when a combination of specific numbers such as 1, 2, and 3.4 is reached, all the switches 36 to 39 are closed and the relay 41 is activated by the power source 40a. .

Further, the mechanisms of the cams 31 to 34 and the switches 36 to 39 of the electromagnetic counter 17 configured in this manner can be provided separately from the housing of the counter 17.

According to the electromagnetic counter 17 configured in this way, when a predetermined amount of tape is wound and the number of rotations of the winding shaft 5 reaches a predetermined number of rotations (1234 rotations in the above example),
All the switches 36 to 39 are closed, the relay 41 is activated, and thereby the power supply 40b to the motor M that drives the winding shaft 5 is released, and at the same time, the brake B is activated and the motor M is suddenly stopped.

At this point, the cutter 9 (see FIG. 1) operates to cut the tape T, and a predetermined amount of tape is wound onto the tape bubble 4, completing the winding operation.

Further, it goes without saying that an electronic counter may be used as the electromagnetic counter 17.

By the way, the tape length depends on the number of rotations of the tape bubble, so when using a tape cassette whose counting is accurately controlled to configure a device that notifies the end of the tape or warns of the end, it is important to check that the tape length is accurate. It must be distinguished from ordinary tape cassettes by the fact that they are count-controlled tape cassettes, and when they are count-controlled tape cassettes, there is no way to notify the end of the tape or to give an end-of-tape warning. , the tape counting control function must work.

In view of the above-mentioned points, an object of the present invention is to provide a tape cassette detection device for a tape recorder, which detects when a tape cassette subjected to the above-mentioned counting management is installed in a tape recorder and activates a counting management function. is to provide.

The present invention will be explained below with reference to illustrated embodiments.

The tape T, the number of turns of which is controlled by the number of rotations of the tape bubble as described above, is stored in a tape cassette 50 as shown in FIG. 5 in order to distinguish it from other tape cassettes.

This tape cassette 50 is provided with detection holes 51 and 52 passing through the upper and lower surfaces on the left and right peripheries, and only when a tape cassette 50 having these detection holes 51 and 52 is installed, as will be described later. The detection holes 51 and 52 are detected by the detection device of the tape recorder, and the counting device is activated to perform counting control.

In addition, the number of turns of the tape T on the tape bubble 4 is constant if it is a cassette of the same type, but when used attached to a tape recorder, the usage state of the tape recorder
That is, since the winding torque in each case is slightly different depending on FF, REW, and PLAY, there is a difference in the number of windings, albeit slightly.

However, the difference in the number of volumes is less than 0.5% at most, and the difference is only 0.15 minutes for a 30-minute one-way tape, so there is no problem at all with advance notice of more than 1 degree. .

Figures 6 and 7 show an embodiment of the device of the present invention that uses the above-mentioned cassette tape to foretell the end of the tape, and Fig. 6 shows the case where the above-mentioned cassette tape is not installed. There is.

In FIG. 6, a tape feed shaft 61 and a tape winding shaft 62 protrude from a bottom cover 63 of a cassette storage chamber of a chassis 60 of a tape recorder, as is well known, and a cassette tape is attached by a guide pin 64. When the cassette is opened, the delivery knob and take-up knob of the cassette are respectively engaged (the tilting is not shown).

Then, the detection holes 51, 52 (fifth
A cassette detection lever 65 (described later) for detecting the cassette tape is located at a position opposite to one of the cassette tapes (see figure).
(see FIG. 7), a tip portion 65a protrudes from the hole 63a.

Further, on the chassis 60, as is well known, a sliding plate 66 on which a hinch roller 68, a recording/reproducing head 67, etc. are mounted and slides is disposed.

The tape counting function of the cassette mounted on the tape recorder is constituted by a counter 80 attached to the upper side of the chassis 60.

This counter shaft (not shown) rotates in conjunction with the tape delivery shaft 61 via a belt 70 and a pulley 69, so that the counter shaft (not shown) measures the number of revolutions of the tape bub engaged with the delivery shaft 61. It is supposed to be counted.

In the figure, reference numeral 81 is a push button for resetting the counter 80 to II □ II.

This counter 80 is constructed as shown in FIG.

Here, the number wheel shows the case of three digits, but it is exactly the same even if it is four digits or other numbers.

Rotating cams 71 to 73 for each digit are separately attached to the counting rotating shaft 80a of the counter 80, together with a number wheel, and normally open switches 74 to 76 corresponding to each cam are connected to the cams. Only when each reaches a specific number due to the action of , will each be closed.

The switches are connected in series, and this configuration is exactly the same as the counting device of the winding mechanism described above.

Further, the chassis 60 of the tape recorder is provided with a detection lever 65 for detecting the above-mentioned detection holes 51, 52 (see FIG. 5) of the tape cassette 50 which is subject to counting control. It serves as a movable contact piece of the normally closed switch S, and its tip 65a is connected to the detection hole 51.
, 52.

That is, as shown in FIG. 7, a detection hole 51 (
52), the detection lever 65 has a base that is a movable contact piece that moves upward, so its tip detection portion 65a enters the detection hole 51 (52),
The normally closed switch S remains closed, but if there is no detection hole 51 (52), the bottom of the cassette presses down the detection tip 65a of the detection lever 65, so the movable contact piece that is the base of the cassette presses down. The detection lever 65 is pushed down against its tendency to move upward, and the normally closed switch is opened.

The electric circuit related to these counting mechanisms is formed by a power supply 78, detection lever switch S1 normally open type switches 74 to 76, a warning device 79, and a power supply 78, and the current flows only when all of the above switches are closed. Then, the warning device 79 is activated.

In this manner, the device of the present invention detects the detection hole 5L52 of the cassette 50 by the action of the detection lever 650 and operates the counter 80.

Therefore, if the tape cassette stores a tape that is not subject to counting control and does not have the detection holes 51, 52, the switch S will not close and the counter will not operate.

An example of the advance notice device has been described above, but as described above, according to the present invention, there is provided a tape cassette detection device that easily detects that the tape cassette is a tape cassette whose tape length is counted and managed, and that operates the counting management function. It is something to do.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an example of a winding mechanism for a tape stored in a cassette, FIG. 2 is a side view showing an example of a winding section for managing the number of tape windings, and FIG. 3A , B is a side view showing another embodiment of the winding unit for managing the number of tape turns, FIG. 4 is a wiring diagram showing the electrical connection state of a counting device for managing the number of tape turns, and FIG. FIG. 6 is a plan view of a tape cassette detecting device for a tape recorder showing an embodiment of the present invention, and FIG. FIG. 2 is a configuration diagram of main parts of the detection device shown in the figure. 4...Tape bubble, 50...Tape cassette, 51.52...Tape cassette detection hole, 77...Detection lever, S... Normally closed switch.

Claims (1)

[Claims] 1. A detection hole provided in a tape cassette containing a tape that has been counted and managed by the number of windings on the tape bubble is detected, and in conjunction with this detection operation, a detection hole is detected based on the rotation amount of the tape bubble. A tape cassette detection device for a tape recorder is configured to close an electric circuit for counting and managing the amount of tape fed.