JPS62154356A - Tape recorder - Google Patents

Abstract

PURPOSE:To obtain a stable tape travel to a magnetic head and a stable tape touch only at the time of sound recording and reproducing without developing a tape winding load in fast forwarding and fast rewinding states by providing a pad position control member for forcibly separating a pad and adding a stable back tension to a magnetic tape only at the time of sound recording and reproducing. CONSTITUTION:A pad shifter 8 is so formed to position before the magnetic head 7, and has such a structure as to always separate the pad from the tape especially at the time of inversion. A back tension load spring 14 is compressed and inserted between a load gear 11 and the collar part of a supporting shaft 12, and pressed with a friction felt 13, whereby a fixed stable load torque is added to the rotation of the back tension load gear 11. When a play rod 10 is operable, the load gear 11 meshes with the outer peripheral gear 2a of a supply reel stand 2, which rotates counterclockwise due to the normal rotation of the tape. On the other hand, the load gear 11 rotates clockwise. Friction load torque in the reverse direction of the supply of the tape 4 acts on the supply reel stand 2, whereby back tension can be added to the magnetic tape 4.

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a tape recorder having a pad position control member for separating a pad in a tape cassette from a magnetic head, and in particular for applying back tension instead of band pressure during recording and playback. The invention relates to a tape recorder.

Conventional technology In recent years, cassette tape recorders have become more compact and light-weighted, and at the same time improvements in performance and power consumption are being promoted. Efforts to improve touch are being accelerated.

Hereinafter, conventional techniques will be explained with reference to the drawings. FIG. 6 shows the arrangement of the tape and magnetic head in the cassette magazine in the recording/playback state. 21 is a magnetic head, 22 is a magnetic tape, 23 is a band,
When the magnetic head 21 is inserted into the central opening window of the cassette magazine, the magnetic tape 22 is pressed against the head 21 by the pad 23. In this state, the tape 22 is run in a predetermined direction.

Problems to be Solved by the Invention However, as described above, the magnetic tape 22 is
In the structure in which the magnetic head 21 is pressed against the magnetic head 21 by the pressure of 3,
Due to the presence of the pad 23, the tape winding force must be set sufficiently large to overcome the tape loads of various cassettes and 7) magazines with heavy band pressures. First, there was a problem in that the motor torque could not be reduced more than necessary.

In addition, simply separating the band from the tape on a single line in order to reduce motor torque will reduce the tape tension, making tape running and tape contact with the head unstable, resulting in deterioration of characteristics such as level fluctuations. Furthermore, if the back tension load mechanism was set inside the supply reel stand, there was a problem that the load would be higher than necessary during fast forwarding and rewinding, and the motor torque could not be reduced. .

In view of the above-mentioned problems, the present invention forcibly separates the pad from the tape at all times, and applies back tension to the tape only during recording and playback to replace the pad pressure that varies depending on the cassette magazine. The object of the present invention is to provide a cassette tape recorder that obtains a stable tape running direction.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a band position control member for forcibly separating the pads pressed against the magnetic head of the magnetic tape during recording and playback, and A back tension adder is provided on the supply reel stand in conjunction with the recording/playback button so that stable back tension can be applied to the magnetic tape in place of pad pressure only occasionally.

Effect of the Invention With the above-described configuration, the present invention provides stable tape running to the magnetic head by applying a back tension load to the supply reel stand only during recording and playback, without applying a tape winding load during the fast forward and rewind states. This results in a tape touch.

EMBODIMENT A cassette tape recorder according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram of a one-capstan automatic reverse type cassette tape recorder showing an embodiment of the present invention.

In the figure, 1 is a cassette magazine, 2 is a supply reel stand, and 3 is a take-up reel stand, and the magnetic tape 4 is driven to run from the supply reel stand 2 side to the take-up reel stand 3 side. The supply reel stand 2 has a gear 2a on its outer periphery. Reference numeral 5 indicates a capstan, and reference numeral 6 indicates a pinch roller, and the mechanism of this embodiment is such that one capstan 5 and one pinch roller 6 are used to hold and drive the tape, thereby making it possible to run the tape in forward and reverse directions. . 7 is a magnetic head;
8 is a pad shifter, and the pad shifter 8 is fixed to the magnetic head 7 so as to always work in a direction to separate the pad 9 from the magnetic tape 4 when the magnetic head is inserted into the cassette magazine 1. , which functions as a pad position control member.

1o is a play lot that is operated during recording and playback, and has a play button (not shown) at one end, and a back tension load gear 11 is provided at the tip, and this gear 11 is connected to the play lot 1. It is rotatably provided so that a friction load of one foot can be obtained against the angle.

The pad shifter 8 is located at the front surface 7 of the magnetic head 7, as shown in FIG. 2 (7) and (a). It is formed so as to be located forward of L, so that the magnetic tape 4 on the front surface 7 & above the magnetic head 7 does not come into contact with the pad 9. Especially when reversing, the pad is always separated from the entire tape in order to reduce the winding torque of the magnetic tape 4 in the cassette magazine 1 fed out from the capstan 5 and pinch roller 6, and to simplify the structure of the mechanism. The structure is designed to allow

In this way, since the pad 9 is always separated from the tape 4, as mentioned above, during forward rotation, back tension is applied to the tape 4 in place of band pressure, and the tape touches the magnetic helad 7 and the tape travels. needs to be stabilized. For this purpose, a back tension applying device consisting of a back tension load gear 11 provided in the play lot 10 is provided.

The specific configuration will be explained below. First, FIG. 3 shows a detailed cross-sectional view of the bank tension load gear 11 shown in FIG. 1. 12 is pack tensicon load gear 1
The back tension load gear 11 is rotatably fixed on the play rod 1o. Reference numeral 13 denotes a friction felt, which is attached and fixed on the play rod 10 at a position concentric with the support shaft 12. Reference numeral 14 denotes a back tension load spring, which is compressed and inserted together with the washer 14 between a recess 11λ formed in the upper part of the back tension load gear 11 and a buckle part 12λ of the support shaft 12, and is always connected to the back tension load gear 11 in the direction of the arrow X. It is biased with a constant force in the direction of . Further, due to this biasing force, the lower waveform groove 11b of the back tension load gear 11 comes into pressure contact with the friction felt 13, and a constant and stable load torque is applied to the rotation of the back tension load gear 11.

The operation of the play rod 10 equipped with the back tension applying device as described above will be explained below. FIG. 4 shows a portion of the supply reel stand 2 in which the mechanism is in a normal rotation state when the play drive 10 is activated. In this state, the play rod 1Q has moved in the direction of the arrow until the back tension load gear 11 meshes with the outer peripheral gear 2a of the supply reel stand 2. Here, the supply reel stand 2 rotates in the direction of arrow B (counterclockwise) as the tape runs forward,
The load gear 11 engaged with the pack tens 7 rotates in the direction of arrow C (clockwise). However, due to the friction load mechanism shown in FIG. 3, a friction load is generated on the back tension load gear 11 in the direction (in the direction of the arrow) opposite to the direction of rotation (direction of the arrow C). A frictional load torque is applied to the supply reel stand 2 in the direction opposite to the direction of supply of the tape 4 (in the direction of arrow E), and back tension sufficient to stabilize the running of the magnetic tape 4 and its contact with the magnetic head 7 is applied to the magnetic tape 4. It becomes possible to do so.

Effects of the Invention As described above, according to the present invention, the pad position control member for separating the pad from the entire magnetic tape can be used.
A bank tension adding device is installed on the supply reel stand to add back tension in place of pad pressure, and the back tension is applied only during recording and playback, so no reel load is applied during fast forwarding or rewinding. , it is possible to add the back tension necessary to stabilize the running and head touch of the magnetic tape only during recording and playback, and the effect on improving cassette tape recorder functions such as power saving and high performance is extremely large. This is an extremely effective invention.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a cassette tape recorder according to an embodiment of the present invention, FIG. 2 (7) is a perspective view of the magnetic head section of the same mechanism, FIG. FIG. 4 is an explanatory diagram showing the operation of the same mechanism during normal rotation direction recording and reproduction, and FIG. 5 is a plan view of the head portion in a conventional recording and reproduction state. 1...Cassette magazine, 2...Supply reel stand, 4...Magnetic tape, 5...Capstan, 7...Magnetic head, 8... Tape shifter, 9...ba. 1Q...play rod, 11...back tension load gear. Name of agent: Patent attorney Toshio Nakao (1 person)
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Claims (1)

[Claims] A pad position control member is provided to separate the pad that presses the magnetic tape against the magnetic head in the tape cassette during recording and playback, and a back tension adding device is provided to apply back tension to the supply reel stand in place of pad pressure. A tape recorder characterized in that a back tension adding device is configured to add back tension only during recording and playback.