CN1069990C

CN1069990C - A device for changing over of modes of a cassette tape recorder

Info

Publication number: CN1069990C
Application number: CN94119864A
Authority: CN
Inventors: 李泽珠
Original assignee: Gold Star Co Ltd
Current assignee: LG Electronics Inc
Priority date: 1994-12-07
Filing date: 1994-12-07
Publication date: 2001-08-22
Anticipated expiration: 2014-12-07
Also published as: CN1124396A

Abstract

The present invention relates to a device for converting operating modes of a cassette sound recorder, which comprises a transferring rod and a selecting rod, wherein the transferring rod fixed to a compacting gear shaft is subjected to a rotating force of an electromagnetic coil rod to rotate for the first time and is subjected to a rotating force of a cam shaft gear to rotate for the second time when a sound playing mode, a sound recording mode, a sound replaying mode and a sound inversely recording mode are selected; the selecting rod installed on a master gear shaft can move up and down, the selecting rod moves downwards when subjected to the first and the second rotating forces of the transferring rod, and thereby, a selecting gear movably installed on the selecting rod is disengaged from a master gear. The device prevents a motor of the driving master gear from being overloaded, and thereby, the device has the advantages of noise reduction and electric power consumption reduction.

Description

The cassette record device for changing over of modes

The present invention relates to the cassette record device for changing over of modes.More particularly, relating to a kind of gear and main drive gear will selected when selecting playback, record, put upside down or recording working method throws off and the cassette record device for changing over of modes of reduction power consumption.

Generally, cassette recorder is a kind of at the electrical equipment of recording existing sound on external voice or the copying magnetic tapes on the tape, it comprises a working method conversion equipment, make the user duplicate sound, can also make the user record external voice according to oneself " A " face that is chosen in or " B " face according to oneself " A " face that is chosen in or " B " face.

As shown in Figure 1, work on hand mode conversion equipment generally comprises: one is hinged on the main drive gear 2 on the mainboard 1, is driven and is rotated by the motor (not shown); One is hinged on and compresses gear 3 on the mainboard 1, is driven and is rotated by main drive gear 2; One is hinged on the cam shaft gear 4 on the mainboard 1, drives selectively and rotates by compressing gear 3; One is installed in solenoid bar 7 on the mainboard 1 by spring 5 elasticity, and it rotates with solenoid 6 actions during translative mode, makes to compress gear 3 and cam shaft gear 4 initial engagement, passes to cam shaft gear 4 with the rotating force that will compress gear 3; One is hinged on the mainboard 1 and the driving stem 9 that is connected with first torsion spring, 8 elasticity, rotates selectively with the rotation of cam shaft gear 4; Be contained in the feature board 10 on the mainboard 1 movably, start the mode switch (not shown) with the rotation of driving stem 9 during move left and right, realize stopping, playback, record, put upside down or fall record; One is articulated in 2 of main drive gears goes up, is subjected to driving stem to drive and the arrangement of clutch of transmission or cut-out power; The dwang 11 that one is articulated on the mainboard 1, drives by solenoid bar 7; One is articulated in the selecting arrangement on 2 of the main drive gears, turned by dwang 11 and transferring power selectively, to realize FF/REW (fast-forward/fast-rewind) mode; One is articulated in the control device that compresses on 3 of the gears, driven by cam shaft gear 4 and the control selecting arrangement, and removes the control to selecting arrangement when selecting the fast-forward/fast-rewind mode; One is hinged on the power transmission on the mainboard 1, thereby is selecting playback, is being subjected to main drive gear 2 to drive selectively transferring power to drive tape by arrangement of clutch and selecting arrangement when recording, put upside down, falling record and fast-forward/fast-rewind.

Cam shaft gear 4 comprises an overhead cam 12 that is positioned at its upside, lay respectively at the cam 13 and an outer cam 14 down of its downside, overhead cam comprises that first connects projection 12a, the second connection projection 12b and the 3rd connection projection 12c, descends cam 14 to comprise the first tooth-like projection 14a, the second tooth-like projection 14b and the 3rd tooth-like projection 14c outward.

Solenoid bar 7 is except that having one to drive first time protruding pin 7b of dwang 11 when solenoid bar 7 rotates, also have one when cam shaft gear 4 rotates, connect selectively first, second, third of overhead cam 12 connect

projection

12a, 12b, 12c first on protruding pin 7a, driving stem 9 has a upper groove 9b and the low groove 9c at two ends up and down except that it, also have one to be the interior second protruding pin 9a of cam 13 guiding down of cam shaft gear 4, the surperficial thereon side of feature board 10 has the 3rd a protruding pin 10a who inserts in the driving stem 9 upper groove 9b.

Arrangement of clutch be included in that its downside fuses with main drive gear 2 so that and the driven wheel 15 that rotates of main drive gear 2; One axle that is hinged on main drive gear 2 goes up, turned by driving stem 9 and the trip(ping) lever 16 that rotates; But one is hinged on the moving gear 17 of trip(ping) lever 16 lower ends, it driven by driven wheel 15 and transmission of power to the power transmission of mentioning later, wherein trip(ping) lever 16 has one the 4th protruding pin 16a in the top, this protruding pin 16a inserts in the low groove 9c of driving stem 9 lower ends, therefore, when driving stem 9 rotated, trip(ping) lever 16 also rotated.

Selecting arrangement comprises: one is hinged on the selector 18 on 2 of the main drive gears, and its upper end has a link block 18a, the one side has one and protrudes piece 18b; And a selection gear 19 that is hinged on the selector lower end, rotate thereby it is driven by main drive gear 2 only when selecting the fast-forward/fast-rewind working method power is passed to the power transmission of mentioning later selectively.

Control device comprises: one is hinged on and compresses the control levers 21 that 3 of gears are gone up and are connected with second torsion spring, 20 elasticity; The one contact tab 21a that fuses with control lever, select playback, record, put upside down when recording mode with cam shaft gear 4 downsides outside first, second, third gear projection 14a, 14b, the 14c of time cam 14 contact and drive controlling bar 21 in proper order; And a connection projection 21b who is positioned at control lever 21 outer rims, the link block 18a of selected bar 18 grasps and connects selector 18 when control lever rotates.

Power transmission comprises: first neutral gear 22 and the second neutral gear 22a, and the two all is hinged on the mainboard 1, put soon in selection/in when falling the working method, selected the driving of gear 19 and rotated soon; One is hinged on the follower gear 23 on the mainboard 1, but thereby being subjected to moving gear 17 to drive first neutral gear 22 when selecting playback, record, put upside down and recording working method rotates; One is hinged on the first volume on the mainboard 1 around gear 24, turn forward wind, rewind and stop buttons tape when rotating being subjected to first neutral gear 22, and second a coiling gear 24a who also is hinged on the mainboard 1, the reverse coiling tape when rotating being subjected to that the second neutral gear 22a drives.

Device with said structure can be transformed into selected playback, records, puts upside down and record working method when halted state, this is to compress gear 3 rotations because the rotation of main drive gear 2 makes, at this moment, solenoid 6 adhesives simultaneously and with compress gear 3 engagements, thereby rotating cam axle tooth changes 4, therefore, because driving stem 9 rotates along interior cam 13 cam paths down, solenoid bar 7 rotates along the cam path of the overhead cam 12 of cam shaft gear, thereby starts mode switch.

Fig. 1 a shows the halted state that can select the fast-forward/fast-rewind working method, explains the working condition of selecting the fast-forward/fast-rewind working method according to this figure below.

In case selected FF (F.F.) working method, being hinged on the main drive gear 2 of mainboard 1 and driven wheel 15 driven by the motor (not shown) and rotates counterclockwise, this rotation direction make be hinged on selector 18 lower ends, with the selection gear 19 of main drive gear 2 engagement simultaneously and first neutral gear, 22 engagements and drive the first volume and rotate around gear 24 clockwise direction, thereby forward fast winding tape.

When selected REW (fast) working method, opposite with selected FF working method, rotation along with main drive gear 2 and driven wheel 15, selector 18 is that center clockwise direction rotation makes selection gear 19 and second neutral gear 22a engagement with its hinge axis also, thereby driving the second coiling gear 24a counterclockwise rotates, therefore, reverse fast winding tape.

Simultaneously, when selected FF/REW working method, because the rotation direction of main drive gear 2 and driven wheel 15, though it is the power that rotate at the center that trip(ping) lever 16 also is subjected to its hinge axis, but because cam shaft gear does not rotate, therefore driving stem 9 is not driven, and the low groove 9c of driving stem 9 lower ends is inserted with the 4th protruding pin 16a of trip(ping) lever 16 upper ends, and net result is that trip(ping) lever 16 can't rotate.

Next explain the working condition the when user selects playback, records, puts upside down and records under the halted state that can only select the FF/REW pattern shown in Fig. 1 a.

At first, if select playback or recording, main drive gear 2 and driven wheel 15 clockwise direction are rotated, drive with gear 3 counter clockwise directions that compress of main drive gear 2 engagements and rotate, at this moment, owing to lose magnetic force after being contained in solenoid 6 energisings on the mainboard 1, so spring 5 pulling solenoid bars 7, making solenoid bar 7 is that the center clockwise rotates slightly with its hinge axis.

Therefore, since from cam shaft gear 4 upper ends cog 12 first connect that projection 12a throws off first on protruding pin 7a promotion inclined-plane, making cam shaft gear 4 is that the center clockwise rotates and compress gear 3 engagements slightly with its hinge axis, thereby cam shaft gear 4 clockwise rotates because of the rotating force that constantly is subjected to compressing gear, while also makes first time protruding pin 7b promotion of solenoid bar 7 lower ends be hinged on an end of the dwang 11 of mainboard 1, and dwang 11 is clockwise rotated slightly.

Above-mentioned situation is shown in Fig. 1 b.

Then, when cam shaft gear 4 constantly rotates, because the contact tab 21a of control lever 21 order is descended first of cam 14 outward with cam shaft gear 4 downsides, second, the 3rd tooth-like projection 14a, 14b, the 14c contact, so being subjected to the control lever 21 of second torsion spring, 20 elastic force is that the center rotates counterclockwise with its hinge axis, at this moment, the solenoid bar 7 continuation driving dwangs 11 that further clockwise rotate owing to the cam path because of cam shaft gear 4 upside overhead cams 12 clockwise rotate, therefore the protrusion piece 18b that pushes away selector 18 1 ends on the other end of dwang rotates counterclockwise selector 18, rotation along with selector 18, control lever 21 rotates counterclockwise, simultaneously the connection projection 21b on the control lever 21 moves, and is not running into up to the connection projection 21b of control lever 21 to be coupled piece 18a under the situation of link block 18a of selector 18 upper ends and to grasp.

On the other hand, be hinged on the mainboard 1 and the driving stem 9 that is connected with first torsion spring, 8 elasticity owing to the second protruding pin 9a of one side along with clockwise rotating of cam shaft gear 4 be imported in down the cam path of cam 13 move and clockwise rotate, thereby driving trip(ping) lever 16 rotates counterclockwise, but therefore be hinged on the trip(ping) lever lower end and with the moving gear 17 of driven wheel 15 engagements also with follower gear 23 engagements, feature board 10 along continuous straight runs that this moment, its 3rd protruding pin 10a was inserted in the upper groove 9b of driving stem 9 upsides move right, thereby drive the position of mode switch to playback or recording.

This situation is shown in Fig. 1 c, and wherein solenoid bar 7 passes through the second link block 12b of protruding pin 7a connection overhead cam 12 on first.

Therefore, because but the driven wheel 15 that clockwise rotates and the rotating force of main drive gear 2 pass to the spool (not shown) by moving gear 17, follower gear 23, first neutral gear 22 and the first volume around gear 24, it is clockwise rotated and the forward wind, rewind and stop buttons tape, thereby can realize playback or recording according to selected working method.

When working method is transformed into playback or recording state as mentioned above, though the power that selector 18 rotated when making it also be subjected to along pin owing to main drive gear 2 and driven wheel 15 clockwise rotate, owing to the control action of control lever 21 can not be rotated selector 18.

Following brief explanation user selects to put upside down or the situation when recording.

When driving stem 9 rotates counterclockwise with the cam path that descends cam 13 in cam shaft gear 4 downsides, in the horizontal direction feature board 10 is moved to the left, thereby drive mode switch to putting upside down and the state of falling the record, at this moment, because but the trip(ping) lever 16 that clockwise direction is rotated makes and is hinged on the trip(ping) lever lower end and also meshes with the second neutral gear 22a with the moving gear 17 of driven wheel 15 engagements, therefore, but the rotating force of driven wheel 15 is by moving gear 17, the second neutral gear 22a and the second coiling gear 24a are passed to spool, counterclockwise reverse drive spool, thus can realize putting upside down or record by selected mode.

This situation is shown in Fig. 1 d, and wherein solenoid bar 7 connects the 3rd of cam shaft gear 4 overhead cams 12 by the first protruding pin 7a and connects projection 12c.

In aforesaid operations, put upside down the control mode of the rotation of selector 18 when recording working method of selection is identical when selecting playback and recording working method, when selecting to put upside down and recording, prevent tape overwind in the other direction in order that prevent when selecting playback and recording that the masterpiece opposite with tape running direction is used for tape, and this need only prevent because the rotation direction of main drive gear 2 and the driven wheel 15 and selector that rotates during along pin with main drive gear 2 and driven wheel 15 passes to the second coiling gear 24a with power by selecting the gear 19 and the second neutral gear 22a.

The control that selector 18 is rotated last till always playback and recording state or put upside down and the state of falling the record under quit work mode and till finishing the mode of stopping of selection again, this can prevent that tape from stopping mode and in the period of the complete stall of motor overwind takes place selected, because motor selected stop mode after stall immediately, several commentaries on classics on before the complete stall of motor, also can changeing again.

If be transformed into playback as mentioned above, record, put upside down and the mode of falling the record after select the mode that stops again, all operations all stops behind the state reaching shown in Fig. 1 a.

Yet, the problem of this work on hand mode conversion equipment is: make motor overload increase power consumption and shortened device lifetime owing to each gear rotates, because when under halted state, selecting playback, record, put upside down and recording mode, be hinged on the selector lower end be used for transferring power so that carry out the selection gear of FF/REW to be subjected to the rotating force of main drive gear not stall moving.

Among the disclosed Japanese patent application JP 6-76414A a kind of cassette record device for changing over of modes was disclosed also on March 8th, 1994, therefore selection gear wherein can not separate with main drive gear selectively, also exists this gear moving and then cause power consumption increase, device lifetime to shorten because of being subjected to main drive gear to drive not stall.

For addressing the above problem a kind of cassette record device for changing over of modes that the purpose of this invention is to provide that designs, it is being selected playback, is recording, puts upside down and make when recording and select gear to break away from main drive gear and make the two engagement under halted state, with this prevent motor in playback, record, put upside down and the mode of falling the record under transship, thereby reduce power consumption, improve this device lifetime, and when selecting working method, prevent the selector play, thereby reduce noise.

Above-mentioned and other purpose of the present invention and feature can realize that this device comprises by a kind of cassette record device for changing over of modes is provided: be contained in coiling gear and main drive gear on the mainboard rotationally with separately axle; One selector that rotates selectively to the main drive gear rotation direction; One cam shaft gear that when sound-track engraving apparatus conversion work mode, turns an angle; One is passed to the gear that compresses of cam shaft gear with the main drive gear rotating force; One is articulated in the transmission bar that compresses on the gear shaft; One when selecting playback and record type the solenoid bar of initial rotation cam shaft gear; Wherein one be contained in selector one end and with the selection gear that main drive gear meshes selectively, be used for the rotating force that the coiling magnetic tape core is required and be passed to the coiling gear; One moves down selector when selecting gear idle running and makes the selector carriage of selecting gear and main drive gear disengaging.

Below, will describe the present invention in conjunction with the accompanying drawings in detail, in the accompanying drawing:

Fig. 1 a～1d is the planimetric map of existing cassette record device for changing over of modes, wherein:

Fig. 1 a represents to select the halted state of FF/REW (fast-forward/fast-rewind) mode;

Cam shaft gear and the initial engagement state that compresses gear when Fig. 1 b represents to select playback, records, puts upside down or records mode;

State when Fig. 1 c represents selected playback or record type;

Fig. 1 d represents selected putting upside down or the state when recording mode;

Fig. 2 a～2d is the planimetric map of cassette record device for changing over of modes of the present invention, wherein:

Halted state when Fig. 2 a represents to select the fast-forward/fast-rewind mode;

Cam shaft gear and the initial engagement state that compresses gear when Fig. 2 b represents to select playback, records, puts upside down or records mode;

State when Fig. 2 c represents selected playback or record type;

Fig. 2 d represents selected putting upside down or the state when recording mode;

Fig. 3 a and 3b are major part enlarged drawings of the present invention, be illustrated in and select the position of selecting gear when stopping mode under the fast-forward/fast-rewind state, wherein:

Fig. 3 a represents the selected mode that stops under the F.F. state;

Fig. 3 b represents soon the selected down mode that stops of state.

The embodiment of the invention shown in 2a～3b describes the present invention in detail with reference to the accompanying drawings.

Accompanying drawing 2a～2d is the planimetric map of cassette record device for changing over of modes of the present invention, Fig. 3 a and 3b are the enlarged drawings of the major part of apparatus of the present invention, be illustrated in and select the position of selecting gear when stopping mode under the fast-forward/fast-rewind state, wherein omit with existing apparatus and have introduction in the same structure parts, use the label identical to represent in the accompanying drawings with existing apparatus.

Critical piece of the present invention comprises: one is fixed on the transmission bar 31 on the axle that compresses gear 3, and it is subjected to solenoid bar 7 rotating forces to rotate and be subjected to cam shaft gear 4 rotating forces for the first time and secondary rotation when selecting playback, record, put upside down and recording mode; One can be installed in the selector 32 on 2 of the main drive gears up or down, and it moves down when being subjected to transmitting the first and secondary rotation power of bar 31, makes the selection gear 33 and main drive gear 2 disengagings that are fixed on movably on the selector 32; One is fixed on the retainer 34 on the mainboard 1, stops selector 32 excessively to move down when the first and secondary rotating force of being transmitted bar 31 moves down when selecting playback, record, put upside down and recording mode.

Herein, why transmit bar 31 can rotate for the first time, be because on transmission bar 31 1 sides, projection 35 is arranged and a projection 36 is arranged on solenoid bar 7, thereby solenoid bar 7 rotates when selecting playback, record, put upside down and recording mode, thereby solenoid bar projection 36 promotes to transmit bar one side projection 35.

Transmit bar 31 and why can make secondary rotation, be because a contact tab 37 is arranged on the bar 31 and on the cam 14 groove 38 is arranged down transmitting, selecting playback, recording, put upside down and the mode of falling the record, contact tab 37 was pushed out from groove 38 and is led by cam under outer 14 when cam shaft gear 4 rotated thus at the outer of cam shaft gear.

Owing to transmit bar 31 opposite sides one protruding part 40 is arranged, and this protruding part 40 has a projection 39 at transmission bar 31 1 ends, on selector 32 tops one slotted hole 41 is arranged, one long guiding hole 42 that is used for inserting main drive gear 2 hinge axis is arranged at selector middle part, therefore transmit bar 31 and selector is led by long guiding hole 42 and move down.

On the other hand, one trapezoidal guide cam 43 wide at the top and narrow at the bottom is housed on the mainboard 1, so that selector be subjected to transmitting be hinged on the selection gear 33 on the selector 32 when the first and secondary rotation power of bar 31 moves down hinge axis along with the selector that is led by guide cam 43 moves down, and prevent to select gear to meet first and second

neutral gear

22 and 22a.

In explanation to working condition of the present invention with said structure, critical piece of the present invention only is described below, omit explanation with the existing structure duplicate components.

Because solenoid 6 does not drive solenoid bar 7 under halted state shown in the accompanying drawing 2, therefore the transmission bar 31 that is hinged on the axle that compresses gear 3 does not rotate, movably be fixed on the selector 32 that can move up and down on the hinge axis of main drive gear 2 and upwards move on to the upper end, transmit this moment in the groove 38 of cams 14 under contact tab 37 ends are inserted outside the cam shaft gear 4 on the bar 31, and be hinged on the selection gear 33 and main drive gear 2 engagements of selector 32 lower ends rotationally.

If the selected fast-forward/fast-rewind mode of user's this moment, because main drive gear 2 rotates forward or backwards by chosen manner, and the hinge axis with main drive gear 2 is central forward or backward rotation to selector 32 by the rotating force direction, therefore be hinged on selection gear 33 and first neutral gear 22 or second neutral gear 22a engagement on the selector 32, carry out the fast-forward/fast-rewind mode.

In aforesaid operations inserted in the slotted hole 41 on selector 32 tops owing to transmit the end bosses 39 of bar opposite side protruding part 40, so selector 32 when rotating forward or backwards selector 32 by projection 39 guiding.

On the other hand, under halted state, if the user selects playback, recording, put upside down or the mode of falling the record, owing to solenoid 6 energisings that are contained on the mainboard 1 lose magnetic force, therefore solenoid bar 7 is subjected to the reset force of spring 5 and is that the center clockwise rotates with its hinge axis, at this moment, because the projection 36 on the solenoid bar 7 promotes to transmit bar one side projection 35, therefore transmit the counterclockwise first rotation of bar 31, and thus, because the projection 39 of opposite side projection piece 40 ends that is inserted in the transmission bar 31 in the selector 32 upper end slotted holes 41 just promotes selector 32 downwards slightly when has just deviate from the groove 38 of cam 14 down slightly contact tab 37 ends on transmitting bar from cam shaft gear 4 outside, therefore the selection gear 33 that is articulated in selector 32 lower ends is just thrown off a segment distance because selector 32 moves down with main drive gear 2, and the size of this distance is directly proportional with the first rotation distance of the transmission bar 31 that is led by transmission bar hinge axis.

This state is shown in Fig. 2 d, and this moment, solenoid bar 7 was subjected to solenoid 6 effects and clockwise direction is rotated, and made cam shaft gear 4 and compressed gear 3 engagements.

Follow aforesaid operations, because the rotating force of main drive gear 2 is delivered to cam shaft gear 4, cam shaft gear 4 is clockwise rotated, therefore can realize playback according to chosen manner, recording, put upside down or record direction, this moment since transmit contact tab 37 on the bar 31 deviate from fully cam shaft gear 4 outer cam 14 down groove 38 and by outer 14 guiding of cam down, therefore the transmission bar 31 of having finished first rotation carries out secondary rotation, and thus, the effect of being transmitted bar 31 opposite side protruding part end bosses 30 owing to the selector 32 by the hinge axis of main drive gear 2 guiding moves down on earth, the selection gear 33 that is hinged on selector 32 lower ends is thrown off fully with main drive gear 2, thereby the rotating force of main drive gear 2 can't be delivered to selection gear 33.

In aforesaid operations, when moving down, selector 32 why can be subjected to the guiding of the hinge axis of main drive gear 2, and be because the long guiding hole 42 at selector middle part has been inserted with the hinge axis of main drive gear 2.

Selected to stop mode under the F.F. mode if be shown in as Fig. 3 a, the hinge axis that is articulated in the selection gear 33 of selector 32 lower ends contacts with the top right-hand side of mainboard 1 upper trapezoid guide cam 43, select gear 32 to mesh with the main drive gear 2 and first neutral gear 22 simultaneously, if be shown in soon as Fig. 3 b in addition and selected to stop mode under the mode, be articulated in the hinge axis of selection gear 33 of selector 32 lower ends and the upper left edge joint of mainboard 1 upper trapezoid guide cam 43 and touch, select gear 32 simultaneously and main drive gear 2 and second neutral gear 22a engagement.If under aforesaid way, selected playback, recording, put upside down or the mode of falling the record, because the hinge axis of selecting gear 33 when selector moves down is by trapezoidal guide cam 43 guiding, therefore, the hinge axis of selecting gear 32 keeps in touch at the right lower quadrant of guide cam 43 or lower left quarter and cam 43, and when selector 32 moves down on earth, retainer 34 keeps in touch on the top of selector 32 1 sides and the mainboard 1, even this moment, cassette recorder was in selected playback, recording, put upside down or the mode of falling the record after when turning round by chosen manner fuselage serious vibration takes place, but because selector 32 is motionless, thereby avoided selector 32 to contact, so the noise that produces might reduce selection mode the time with first neutral gear 22 or with second any of neutral gear 22a.

In aforesaid operations, as under upper right quarter shown in Fig. 3 a or the lower left quarter state of contact shown in Fig. 3 b, carrying out playback, record, put upside down or the mode of falling the record at hinge axis and the guide cam 43 of selecting gear 33, even cassette recorder seriously vibrates the second neutral gear 22a that selects gear 33 and first neutral gear 22 that rotates or rotate do not have any reason that contacts yet and be that the guide cam 43 that leads for the hinge axis of selecting gear 33 when selector 32 moves down has trapezium structure wide at the top and narrow at the bottom.

On the other hand, Fig. 2 c is depicted as the situation when being transformed into playback or record type behind selected playback or the record type, Fig. 2 d is depicted as selected put upside down or the mode of falling the record has been transformed into the situation of putting upside down or recording mode, consider that the existing explanation to existing apparatus of its detailed explanation reference can understand, so omit at this.

Therefore, the present invention has many advantages, for example because the selection gear that when selecting playback, record, put upside down or recording mode, is articulated in selector the two engagement during in halted state with the main drive gear disengagement, thereby avoided the play of selector, select the unnecessary rotation of gear, therefore avoided driving the motor overload of main drive gear, thus noise not only reduced, and reduced power consumption.

Although in conjunction with specific embodiments the present invention is described above, those skilled in the art obviously can make all changes according to foregoing description.Therefore, the present invention should regard as and comprise that all meet the change of the spirit and scope of appended claim.

Claims

1, a kind of cassette record device for changing over of modes comprises:

Be contained in a coiling gear and a main drive gear on the mainboard rotationally with separately axle;

One selector that rotates selectively to the main drive gear rotation direction;

One cam shaft gear that when sound-track engraving apparatus conversion work mode, turns an angle;

One compresses gear, is used for the rotating force of main drive gear is passed to cam shaft gear;

One is hinged on the transmission bar that compresses on the gear shaft;

One solenoid makes the cam shaft gear initial rotation when selecting playback and record type;

It is characterized in that:

One be loaded on selector one end and with the selection gear that main drive gear meshes selectively, be used for the required rotating force of coiling magnetic tape core is delivered to the coiling gear;

One selector carriage throws off selection gear and main drive gear by moving down selector when selecting gear idle running.

2, device as claimed in claim 1 is characterized in that, described selector carriage comprises:

The one first selectively solenoid projection that transmits bar that rotates;

One is positioned at and transmits bar one end, is used for the projection on push-and-pull selector top up and down;

One is positioned at the long guiding hole on the selector, is used to form the slip under the main gear shaft guiding.

3, device as claimed in claim 1 is characterized in that also comprising that one is positioned at the retainer on the mainboard, and it contacts with selector one upper lateral part that pushes away under the selected stem slide device, thereby prevents the selector play.

4, device as claimed in claim 1 is characterized in that, transmitting on the bar has a contact projection that can contact with cam shaft gear, thereby makes this transmission bar carry out secondary rotation with the rotation of cam shaft gear.

5, device as claimed in claim 2 is characterized in that, the rotating shaft that is hinged on the selection gear on the selector is configured to it and is led by the guide cam on the mainboard when selector is subjected to transmitting bar and once reaches secondary rotation power and move down.

6, as device as described in the claim 5, it is characterized in that, guide cam be shaped as narrow trapezoidal in the wide base of top margin, prevent that gear from running into other gear of selecting around the gear when moving down on earth at selector.