JPH0323840U

JPH0323840U -

Info

Publication number: JPH0323840U
Application number: JP8161689U
Authority: JP
Priority date: 1989-07-13
Filing date: 1989-07-13
Publication date: 1991-03-12

Description

[Brief explanation of drawings]

第１図は本考案による純機械的リバース機構が
組み込まれたカセツトテープ再生装置の要部を示
す平面図、第２図ａおよび第２図ｂは一対のアイ
ドル歯車の係合位置および非係合位置を交互に切
り換えるレバー板を示す平面図、第３図ａは本考
案による純機械的リバース機構の一部を示す平面
図、第３図ｂは第３図ａの一部を拡大して示す部
分平面図であつて、ヘツド後退レバーとＦＦレバ
ーおよびＲＥＷレバーとの作動関係を示す図、第
４図はテープ走行切換歯車とこれに作用するトー
シヨンばねとを示す詳細分解斜視図、第５図ａは
テープ走行切換歯車機構に組み込まれたロツクレ
バー機構を示す平面図、第５図ｂは第５図ａの
ｂ−ｂ線に沿う断面図、第６図は再生ヘツドを
搭載するヘツド搭載板を示す平面図、第７図ａお
よび第７図ｂは第２図ａおよび第２図ｂと同様な
平面図であつて、そこに示されたレバー板と第６
図のヘツド搭載板の一部すなわち舌片部との相対
位置関係を示す平面図である。１０，１２……アイドル歯車、１４，１６……
歯車ホイール、１８……シヤシ基板、２０……駆
動モータ、２２……歯車列、２４……引張りコイ
ルばね、２５……レバー板、２６，２８……カム
スロツト、３０……リンク部材、３２……テープ
走行切換歯車、３４……小駆動歯車、５０……ロ
ツクレバー、５２……ロツク解除レバー、６４…
…ロツド要素、６６……作動レバー、７０……Ｆ
Ｆレバー、７２……ＲＥＷレバー、８０……スリ
ーブ要素、８２……カム歯車、８４……従動レバ
ー、８６……ヘツド後退レバー、９０……矩形開
口部、９２……ロツクレバー、９４……トーシヨ
ンばね、９６……ヘツド搭載板、１００……再生
ヘツド。 Fig. 1 is a plan view showing the main parts of a cassette tape playback device incorporating a purely mechanical reverse mechanism according to the present invention, and Figs. 2a and 2b show engaged and disengaged positions of a pair of idle gears. FIG. 3a is a plan view showing a part of the purely mechanical reverse mechanism according to the present invention; FIG. 3b is an enlarged view of a part of FIG. 3a. FIG. 4 is a partial plan view showing the operational relationship between the head retraction lever, the FF lever, and the REW lever; FIG. 4 is a detailed exploded perspective view showing the tape running switching gear and the torsion spring acting on it; FIG. FIG. 5a is a plan view showing the lock lever mechanism incorporated in the tape running switching gear mechanism, FIG. The plan views shown in FIGS. 7a and 7b are similar plan views to FIGS. 2a and 2b, and the lever plate and the sixth
FIG. 3 is a plan view showing a relative positional relationship with a part of the head mounting plate shown in the figure, that is, a tongue portion. 10,12...Idle gear, 14,16...
Gear wheel, 18... Chassis board, 20... Drive motor, 22... Gear train, 24... Tension coil spring, 25... Lever plate, 26, 28... Cam slot, 30... Link member, 32... Tape travel switching gear, 34...Small drive gear, 50...Lock lever, 52...Lock release lever, 64...
...Rod element, 66...Operating lever, 70...F
F lever, 72... REW lever, 80... sleeve element, 82... cam gear, 84... driven lever, 86... head retraction lever, 90... rectangular opening, 92... lock lever, 94... torsion Spring, 96...Head mounting plate, 100...Reproduction head.

Claims

[Claims for Utility Model Registration] An engaged position where the gear wheels of a pair of tape winding reels are engaged to apply a rotational driving force, and a non-engaged position where the gear wheels are disengaged from each of the gear wheels and no rotational driving force is applied. a pair of idle gears arranged so as to be able to shift between said pair of idle gears, and only one of said pair of idle gears is in an engaged position with respect to the gear wheel of the corresponding tape take-up reel; an idle gear switching link mechanism that switches the engagement of the pair of idle gears so as to shift the gear to a non-engaged position with respect to the gear wheel of the corresponding tape take-up reel; a tape running switching gear mechanism that periodically operates the idle gear switching link mechanism to alternately switch engagement positions; and maintaining the pair of idle gears alternately switched between an engaged position and a non-engaged position. a lock lever mechanism that selectively locks the tape running switching gear mechanism, and the locking lever mechanism half-locks the idle gear switching link mechanism each time the tape running switching gear mechanism is released from a locked state. After the periodic operation is performed, the tape running switching gear mechanism is locked again, and furthermore, a lock lever mechanism is incorporated in the lock lever mechanism to release the locking state of the tape running switching gear mechanism by the lock lever mechanism. comprising an actuation lever mechanism, said actuation lever mechanism being started by simultaneous pushing operation of a tape fast-forward lever and a tape rewind lever, and at this time said pair of idle gears are both connected to gear wheels of said pair of tape take-up reels; and the gear wheels of the pair of tape take-up reels stop rotating at the end of the tape run. The tape end detection mechanism includes a tape end detection mechanism that switches one run of the tape by detecting a tape end, and the tape end detection mechanism includes a cam gear having first and second cam surfaces, and a cam gear having first and second cam surfaces of the cam gear. and a driven lever that is cam-engaged to assume first, second, and third rotational positions, and the driven lever is configured to rotate when the gear wheels of the pair of tape take-up reels are driven to rotate. receives a rotational biasing force from the gear wheel to bias the gear wheel into a first rotational position and by cam engagement with a first cam surface of the cam gear.
and a second rotation position, and when the gear wheels of the pair of tape take-up reels stop rotating at the end of tape travel, the driven lever moves to the cam gear. is biased to a second rotational position by the first cam surface of the cam gear, and then biased to a third rotational position by cam engagement with the second cam surface of the cam gear; In a reverse mechanism for a cassette tape playback device, wherein a lever operates the lock lever mechanism to release the locked state of the tape running switching gear mechanism, the operating lever mechanism includes a driven lever of the tape end detection mechanism. An engaged elastic spring element is provided, and when the actuation lever mechanism is activated by a simultaneous push-in operation of the tape fast forward lever and the tape rewind lever, the elastic spring element engages the tape end detection mechanism. The driven lever of
A reverse mechanism for a cassette tape playback device, characterized in that it acts to bias the rotational position of the tape.