CN1094634C

CN1094634C - Drive system in tape recorder

Info

Publication number: CN1094634C
Application number: CN96110461A
Authority: CN
Inventors: 篠原功; 久保健次
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 1995-06-07
Filing date: 1996-06-07
Publication date: 2002-11-20
Anticipated expiration: 2016-06-07
Also published as: KR100282139B1; KR970003014A; JP3129148B2; JPH08335343A; MY127625A; CN1149179A

Abstract

To improve rotation transmitting efficiency and to save electric power of the tape recorder by suppressing tension of a belt for transmitting rotation of a motor to a gear pulley to an irreducible minimun even at the time of fast forwarding and rewinding. The rotation of the motor 3 is, transmitted via the belt 4a to a flywheel 2b, and is then transmitted to a relay gear pulley 5 provided with a large diameter gear 5a meshed with a large diameter gear 2ba of this flywheel. Moreover, rotation of the relay gear pulley 5 is transmitted via a belt 4b to a flywheel 2a, while a gear mechanism 6 and a mode changeover mechanism 13 of the tape recorder are driven via a 1st relay gear 6a and a main gear 6b by the relay gear pulley 5. Consequently, even at the time of fast forwarding and rewinding by forward and reverse rotation of the motor, rotational load on the belt is reduced to improve the rotation transmitting efficiency, and hence the electric power is saved as well.To set minimum necessary tension by making the lengths of belt taut and slackening sides equal to each other even during fast-forwarding or rewinding by the forward/backward rotation of a motor. This recorder is provided with a gear mechanism 6 for rotating reel gears 6h and 6j coaxial to first and second reels for magnetic tape winding, a relay gear pulley 5 to transmit the rotation of a motor 3 to the gear mechanism and to be engaged with a gear 6ba coaxial to a second capstan 1b and a second flywheel 2b, a first belt 4a for transmitting the motor rotation to the second flywheel 2b and the relay gear pulley 5, and a second belt 4b for transmitting the rotations of the second flywheel 2b and the relay gear pulley 5 to a first flywheel 2a coaxial to a first capstan 1a. Rotation is transmitted to the reel for rotation via the first belt 4a, the relay gear pulley 5 and the gear mechanism.

Description

Drive system in the magnetic tape recorder

The present invention relates to cassette tape recorder, particularly relate to the improvement of the inner transmission efficiency of cassette tape recorder.

In recent years, so that realize information playback or record when long, various schemes have appearred for the electric power consumption that reduces cassette tape recorder.The most cassette tape recorders that can see on market at present adopt drive system as shown in figure 22, according to this figure prior art are described in this article.

As shown in figure 22, this drive system comprises drive motor 31, power wheel 33, and with coaxial first and second flywheel 34a and the 34b that are connected of first and second rollers, and an idle pulley 34c.For the power of drive motor 31 is sent on the power wheel 33, adopted an annular driving band 32.As shown in the figure, first of driving-belt 32 extends to power wheel 33 from drive motor 31 after walking around the first flywheel 34a, so that drive flywheel 34a, and on the second flywheel 34b, make it towards rotating with the direction of the switched in opposite of the first flywheel 34a towards direction.Second of driving-belt 32 extends to drive motor 31 from power wheel 33 after walking around idle pulley 34c.

Those skilled in the art knows, when cassette player is set under fast-forward mode or the recoil pattern so that during apace from the tape of axial another conveying certain-length the load maximum of drive motor.The tractive force of annular driving band normally regulate according to allowing to be applied to by maximum load on the drive motor, so that prevent the fracture of driving-belt, and guarantees have enough power to be passed on other moving components of cassette player.

Yet, in drive system shown in Figure 22 as can be seen, during the fast-forward mode of drive motor forward drive or at drive motor during the recoil pattern that drives on the opposite opposite direction, the power of drive motor 31 is sent to power wheel 33, the positive veer of driving-belt 32, just one of first and second of driving-belt 32 move towards drive motor 31, and return face, just the another side in first and second of driving-belt 32 then leaves drive motor 31, they are drawn respectively and are loosened, the tractive force that is pulled on the face of driving-belt correspondingly obtains adjusting, and the driving force of being transmitted during rotating counterclockwise by drive motor 31 obtains required tractive force.For instance, if the driving force during the driving force of transmitting during the F.F. is lower than recoil, the tractive force that obtains during F.F. just can be adjusted to required power.

Yet, if select the tractive force of driving-belt in a manner described, the one side of band will be subjected to bigger tractive force, for example during recoiling, the tractive force that driving-belt is subjected to might increase to the value that is higher than required tractive force, therefore, act on the load on the driving-belt and act on drive motor 31, the power wheel 33 and the first and second flywheel 34a, the transverse pressure on the 34b can increase significantly, and its rotational efficienty can correspondingly descend.

The objective of the invention is to eliminate above-mentioned shortcoming intrinsic in the cassette player drive system of prior art basically, and provide a kind of tape note or and/or replay device in used improved drive system, wherein the tractive force of the rotating force that is used to transmit drive motor is reduced to required minimum value, so that improve the efficient of rotating.

In order to realize this purpose, the present invention provides a kind of drive system for magnetic tape sound reproducer, be used for the rotating force of drive motor by endless belt system be delivered to respectively with coaxial first and second flywheels of first and second rollers and also by first and second flywheels be delivered to the drive gear mechanism that is used to drive magnetic tape core, thereby the driving magnetic tape core is characterized in that being provided with: rotating force that is used to transmit this drive motor to first endless belt of coaxial second flywheel of second roller, the middle power wheel that a gear that is meshed with the coaxial gear of second flywheel is housed, and one be used to transmit neutral gear turn to the first coaxial flywheel of first roller on second endless belt; And the rotating force of motor is delivered to by first endless belt and drives this second flywheel and also drive magnetic tape core by drive gear mechanism in second flywheel, and is delivered to by second endless belt and drives this first flywheel in first flywheel.

According to the present invention, being drawn and loosen face and can have identical length of driving-belt, even the forward that utilizes drive motor makes the length F.F. of tape and recoils with reverse drive during also is the same, and can select minimum required tractive force, thereby make the rotation load minimum of driving-belt, realize transmission efficiently thus, so just can save the energy of magnetic tape sound reproducer.

Also adopted a kind of like this structure in addition, make the power of drive motor be delivered to drive gear mechanism by the middle power wheel or second flywheel, the load that is produced by drive gear mechanism only is the load of driving-belt, therefore can be chosen as further minimum value to the tractive force of second driving-belt, make magnetic tape sound reproducer obtain further energy-saving effect.

By being more clearly visible above-mentioned and other features of the present invention below in conjunction with accompanying drawing to the description of most preferred embodiment, identical part has adopted identical label among the figure, wherein:

Fig. 1 is the top view that embodies the dissection of a cassette player of the present invention;

Fig. 2 is the planar rear view of the cassette player seen from the cassette player rear, has represented magnetic recording and/or reproducing head and relevant parts thereof;

Fig. 3 is a flat sheet of the bottom view of having laid down the cassette player of case type shell;

Fig. 4 is the flat sheet of the bottom view of an amplification, has represented a part of mechanism among Fig. 3, and F.F. bar wherein is by the static stop position that remains on;

Fig. 5 is similar to Fig. 4, makes the F.F. bar from the d/d situation of stop position with first control lever during being illustrated in the reverse drive of drive motor;

Fig. 6 is similar to Fig. 4, the d/d momentary status of expression F.F. bar;

Fig. 7 is similar to Fig. 4, the state of expression F.F. bar when just discharging;

Fig. 8 is similar to Fig. 4, the state during the expression recoil pattern;

Fig. 9 is similar to Fig. 4, the state during the expression fast-forward mode;

Figure 10 is similar to Fig. 4, and expression is from stop position or recoil the transition state of mode switch to the forward drive replay mode;

Figure 11 is similar to Fig. 4, the state of expression forward drive playback duration;

Figure 12 is similar to Fig. 4, the state of expression reverse drive playback duration;

Figure 13 is the flat sheet of the bottom view of cassette player, has represented such as each revolving parts such as gears, is in position separately during their stop positions after the F.F. bar is released;

Figure 14 is similar to Figure 13, the state of expression forward drive playback duration;

Figure 15 is similar to Figure 13, the state of expression reverse drive playback duration;

Figure 16 is similar to Figure 13, the state during the expression F.F.;

Figure 17 is similar to Figure 14, the state during expression is recoiled;

Figure 18 A is a planimetric map, represents pinch roller and magnetic recording and/or replicating head in F.F., the state on recoil and the stop position;

Figure 18 B is the planimetric map of a dissection, and expression is used for the control element of each position of pinch roller shown in the control chart 18A and magnetic head;

Figure 19 category-A is similar to Figure 18 A, the state of expression forward drive playback duration;

Figure 19 category-B is similar to Figure 18 B, the state of expression forward drive playback duration;

Figure 20 category-A is similar to Figure 18 A, the state of expression reverse drive playback duration;

Figure 20 category-B is similar to Figure 18 B, the state of expression reverse drive playback duration;

Figure 21 is similar to Fig. 3, represents a kind of change form of drive system of the present invention; And

Figure 22 is the schematic bottom view of the cassette player of prior art.

Referring to accompanying drawing, comprise a common rectangular flat formula tape drum according to cassette player of the present invention, it is that first and second roller 1a and the 1b that are separated from each other along the forward position of tape drum are arranged, and supporting these rollers rotationally by tape drum, they are vertically stretched out from tape drum in one direction.The first roller 1a is used to transmit in the tape cassete (referring to Fig. 1 towards a direction, 18A, the tape (not shown) of the certain-length dotted line shown in 19A and the 20A), be used for the information on this tape length of normal playback, and the second roller 1b is used to transmit in the opposite direction the tape of certain-length, is used for that reverse reproduction goes out information from this tape length.The first and second roller 1a are connected respectively with 2b with the first and second flywheel 2a coaxially with 1b, therewith rotate, above-mentioned first and second flywheel 2a and 2b are positioned in a side of tape drum, and this side is relative with the residing side of 1b with the first and second roller 1a, as shown in Figure 2.

Label 3 represent one can electronic reverse drive motor, it is connected to the second flywheel 2b, and is connected to the second roller 1b by the first endless belt 4a.The power that is delivered to the drive motor 3 on the second flywheel 2b then is sent to middle power wheel 5, it has one and constitutes the gear wheel in large diameter 5a of one coaxially with it, gear 5a and gear wheel in large diameter 2ba engagement, the gear 2ba and the second flywheel 2b constitute one coaxially, so that together rotate.Middle power wheel be in transmission connection with first flywheel 2a formation by the second endless belt 4b, power is passed to the first roller 1a.Obviously, the first and second flywheel 2a and 2b are driven on reciprocal all directions by drive motor 3.

Label 6 is represented a drive gear mechanism, be used for selectively the power of drive motor 3 being sent to one of the first and second spool 7a and 7b, when tape cassete was loaded on the cassette player according to the mode of well known to a person skilled in the art, the reel in spool 7a and 7b and the tape cassete was meshing with each other.This drive gear mechanism comprises the first relay gear 6a that is carried rotationally by the chassis, it comprises a gear wheel in large diameter 6aa who is meshed with gear wheel in large diameter 5a, one constitutes the small diameter gear 6ab of one and the main drive gear 6b that is meshed with small diameter gear 6ab coaxially with gear wheel in large diameter 6ab.Main drive gear 6b is installed in by friction on the bearing sleeve of slip gear 6d, and slip gear 6d is pressed into a friction pulley 6c and forms rubbing contact by a pad and friction pulley 6c under the effect of a pressure spring.As shown in Figure 13 to 17, above-mentioned slip gear 6d is positioned in the middle position between main drive gear 6b and the chassis usually.

Label 6e represents the walking gear between main drive gear 6b and chassis, referring to Figure 13 to 17.This walking gear 6e is meshed with slip gear 6d and is contained in rotationally on the supporting pin 9a, and supporting pin 9a is fixedly mounted on the bar 9 that moves about that can rotate around pivot pin 8.Walking gear 6e can arrive first, second and one of the 3rd position around the position that pivot pin 8 rotates according to the bar 9 that moves about according to the following mode that will illustrate.Specifically, when walking gear 6e is positioned at primary importance, the rotating force on the walking gear 6e be passed to the coaxial first volume shaft gear 6h of the first spool 7a on; When walking gear 6e is in the second place, the rotating force on the walking gear 6e be passed to the second coaxial spool gears 6j of the second spool 7b on; And when walking gear 6e was in the 3rd position, walking gear 6e broke away from any one first and

second spool gears

6h and 6j.

Label 6f representative is by the chassis rotational support and can be in the first position the idle pulley that Shi Yuqi meshes at walking gear.Be delivered to the walking gear on the idle pulley 6f rotating force can by be delivered between the first spool driven wheel 6g between first volume shaft gear 6h and the idle pulley 6f with the coaxial first volume shaft gear 6h of the first spool 7a on.So just as can be seen, when walking gear 6e was in primary importance, the rotating force of walking gear 6e can be delivered to the first spool 7a by the idle pulley 6f and the first spool driven wheel 6g successively.

Label 6i representative support rotationally by the chassis and with one the second spool driven wheel that is meshed with the coaxial second spool gears 6j of the second spool 7b.When walking gear 6e was in the second place, the second spool driven wheel 6i and its engagement were delivered to the second spool gears 6j to the rotating force of walking gear 6e.Just as can be seen, when walking gear 6e was in the second place, the rotating force of walking gear 6e can be delivered on the second spool 7a by the second spool driven wheel 6i thus.

Label 6Ka representative can with the first F.F. gear of main drive gear 6b engagement, and label 6Kb representative can be selectively and the second F.F. gear of one of the first and second spool driven

wheel

6g and 6i engagement.The first and second F.F. gear 6Ka and 6Kb be by coaxial being installed on the F.F. bar 10 rotationally, by a kind of bias spring for example a stage clip (not shown) make the first F.F. gear 6Ka and second F.F. gear 6Kb formation rubbing contact.F.F. bar 10 has first a groove 10a who is substantially arc, this groove is limited between the F.F. bar 10, and receive a pin 11a on the end that is fixed on second control lever 11 therein, and also have qualification second a groove 10b who is substantially arc within it, receive pin 12 in it.F.F. bar 10 can pivot a predetermined angle by a centre position under the guiding of

11 and 12 between first and second positions, move into each first and

second grooves

10a and 10b then.Specifically, when F.F. bar 10 is in primary importance, drives F.F. gear 6Ka itself and main drive gear 6b are meshed, as shown in Figure 8, make the second F.F. gear 6Kb and the first spool driven wheel 6g form engagement in rotation; When F.F. bar 10 was in the second place, the first fast engaging contact wheel was driven the engagement with main drive gear 6b, the second F.F. gear 6Kb is meshed, referring to Fig. 9 and 16 with the second spool driven wheel 6i; And when F.F. bar 10 mediated, the second F.F. gear 6Kb was maintained at the position that all breaks away from the first and second spool driven

wheel

6g and 6i, as Fig. 3, and 4 and 13.

Label 13 is represented a model selection mechanism, thereby is used to control the traffic direction on the drive gear mechanism 6 change tape T length.Model selection mechanism 13 comprises by the chassis rotatably support and comprises the second relay gear 13a of a gear wheel in large diameter 13aa, it and main drive gear 6b mesh, and one form the small diameter gear (not shown) of one coaxially with gear wheel in large diameter 13aa, also have the 3rd a relay gear 13b by the chassis rotating support, it comprises that the gear wheel in large diameter 13ba that is meshed with the small diameter gear (not shown) of the second relay gear 13a and one and gear wheel in large diameter 13ba form the small diameter gear 13bb of an integral body coaxially.Model selection mechanism 13 also comprises cam 13c, and it vide infra with the mode at a kind of intermittence and the small diameter gear 13bb engagement of the 3rd relay gear 13b.

Cam 13c has the external edge edge of tooth punching, and has first, second and the 3rd no toothed portion 13ca, 13cb and 13cc, as the small diameter gear 13bb and first to the 3rd no toothed portion 13ca, 13cb during one of 13cc alignment isolates small diameter gear 13bb, vide infra.This cam 13c has reciprocal first and second surfaces, and first surface is facing to the chassis.First and second surfaces of cam 13c are respectively equipped with the first cam path 13cd and the second cam path 13ce.Also be provided with third and fourth cam 13cf and the 13cg on the position of contiguous its excircle in the first surface of cam 13c.

Label 13d represents to comprise the calutron of a tabular 13da unshakable in one's determination and a magnetic-attraction element 13db.The structure of this calutron 13d is such, promptly so long as remove electric excitation, 13da unshakable in one's determination just is attracted to magnetic-attraction element 13db one side by a permanent magnet (not shown), and when calutron 13d was subjected to electric excitation, the 13da unshakable in one's determination that is attracted by permanent magnet just was released.Calutron 13d comprises that also an end is around pivotally connected free-ended Electromagnetic Drive arm 13e at 13da unshakable in one's determination, it is setovered towards required direction by a spring part 13f, thereby the outside 13da unshakable in one's determination shifts calutron 13d onto just makes 13da unshakable in one's determination separate with magnetic-attraction element 13db.The other end of Electromagnetic Drive arm 13e has fixed installation pin 13ea thereon, sees Fig. 4, and above-mentioned pin 13ea is engaged among the second cam path 13ce of cam 13c slidably.

Label 13g represents around being pivotally mounted in a selector bar on the pivot pin 18.A guide finger 13cd is housed on one end of this selector bar regularly, and is engaged on slidably among the first cam path 13cd among the cam 13c, be equipped with one at the other end of selector bar and be fixedly coupled pin 13gb, it links to each other with slip control panel 13h.See the most clearly from Fig. 2 and 18 to 20, slip control panel 13h extends along the forward position on chassis and carries first and second pinch roller arms control pin 13ha and 13hb, and they are to adorn thereon by load bearing arm 13he respectively.Specifically, each load bearing arm 13he is fixedly mounted in the one end to corresponding control pin 13ha or 13hb, and has an overall center section around being pivotally mounted on the pivot pin 13hf, and pivot pin 13hf is contained on the control panel 13h.Usually by a corresponding spring part 13hg biasing, the projection 13hh that stops on making its other end and being located at slip control panel 13h docks each load bearing arm 13he.Because load bearing arm 13he setovers by spring part 13hg separately is such, will force first and second pinch roller arms control pin 13ha and 13hb to move towards the corresponding first or second pinch roller 17a or 17b.

Each control piece 16ab and the 16bb that so just can make first and second pinch roller arms control pin 13ha and 13hb and be located on the first and second pinch roller arm 16a and the 16b mesh,

pinch roller arm

16a and 16b are supported by a common prolongation support 15, so that rotate around corresponding pin 16aa and 16ba.The first and second pinch roller 17a and the 17b that cooperate with the first and

second roller

1a and 1b are installed in rotation on respectively on the first and second pinch roller arm 16a and the 16b.First and second pinch roller arms control pin 13ha and 13hb can be meshing with each other with 17b with the corresponding first and second pinch roller 17a and separate by operation, promptly respectively with the engagement of first and second rollers and separate.As can be seen from Figure 1, support 15 with pivotal support by the first and second bracket leg support member 14a and the 14b that are fixedly mounted on the chassis.

In described embodiment, the first and second

pinch roller arm

16a and 16b can freely pivot, and are not subjected to the biasing of any direction.Yet adopted a kind of like this structure, promptly only when cassette player is set to information playback or logging mode, one of the first and second pinch roller 17a and 17b just form friction engagement with corresponding rolling

wheel

1a or 1b, so that carry the tape of certain-length, and when cassette player is set at the F.F. or the pattern of recoil, make one of the first and second pinch roller 17a and 17b break away from corresponding rolling

wheel

1a or 1b.

Label 13i represents that one is supported on drive link below the chassis by pivot pin 19, so that rotate around pivot pin 19.The end of this drive link 13i is connected to the pin 13hc that is fixed on the control panel 13h, thereby stride across the thickness on chassis and extend, its other end operationally is connected to the bar 9 that moves about by a connecting pin 13ia fixed thereon, and connecting pin 13ia is engaged among defined in the bar 9 that moves about one the seam 9b.

Tape load bearing arm that is carried by pivot pin 20a by support 15 of label 20 expressions is so that can rotate around pivot pin 20a.In about middle part of this magnetic head load bearing arm 20 magnetic recording and/or replicating head 21 are housed regularly, other has a rear surface that is made of control piece 20b.Magnetic head load bearing arm 20 is setovered around pivot pin 20a towards a direction by spring 22 under regular situation.Thereby magnetic head 21 is separated with the length of tape T, just make in the magnetic head 21 indentation supports 15, when cassette player is in information playback or logging mode, also can revolt spring 22 and make magnetic head 21 and tape realize sliding contact, touch the tape T that is in that part of length between the first and second roller 1a and the 1b.During information playback or logging mode, magnetic head load bearing arm control pin 13hd promotes the control piece 20b with magnetic head load bearing arm 20 one, and magnetic head load bearing arm 20 resistance springs 22 are pivoted, and magnetic head 21 partly is meshed with the length of tape T.In the present embodiment, as Figure 18 B, shown in 19B and the 20B, magnetic head load bearing arm control pin 13hd is made of peucinous spring, thereby it can be avoided on the direction away from this length tape T partly, thereby make magnetic head 21 can not surpass the distance that requires towards the overhang of the tape T of this length part.

Middle part of label 23 expressions is by first control lever of pivot pin 23a around pivotal support, and it can rotate around pivot pin 23a.One end of first control lever 23 and the 3rd cam 13cf engagement of sliding, an and end is provided with an engaging pin 23b, the position of first control lever 23 that pin 23b is controlled according to the shape by the 3rd cam 13cf are selectively with the 10c engagement of engagement ditch and separate.According to the position of engaging pin 13b with respect to engagement ditch 10c, not only can adjust the position of F.F. bar 10, can also make its release, so that make the rotating force of main drive gear 6b can be passed to the first F.F. gear 6Ka during F.F. or recoil pattern and when selecting a kind of pattern, thereby the rotation that makes the first F.F. gear 6Ka can be delivered to F.F. bar 1 by friction and move it, and so just can make selected among the second F.F. gear 6Kb and the first and second spool driven wheel 6g and the 6i one to be meshed.

About middle part of aforesaid second control lever 11 is around being pivotally mounted in pivot slightly on the 23a, and one end and the four-cam 13cg engagement of sliding has a backgear 11b and be loaded with on the other end of pin 11a, referring to Fig. 3.Backgear 11b can be with being contained in second F.F. gear 6Kb engagement on the F.F. bar 10 with the first F.F. gear 6Ka, and this depends on the position of F.F. bar 10, and F.F. bar 10 operationally is connected to second control lever 11 by the pin 11a that is received among the first seam 10a.When the end of second control lever 11 and four-cam 13cg slided engagement, second control lever 11 rotated around pivot 11a, and backgear 11b moves towards main drive gear 6b, and the first F.F. bar 6Ka and main drive gear 6b mesh.When the first F.F. gear 6Ka and main drive gear 6b engagement in the manner described above occur in F.F. bar 10 by following regular motion, at first control lever 23 during from the halted state snap-out release, engaging pin 23b suspends the F.F. bar, when thereby above-mentioned engagement also occurs in and discharges the F.F. bar and be transformed into the recoil pattern from fast-forward mode from halted state, and, also to be illustrated hereinafter this from recoiling mode switch in fast-forward mode.

It should be noted that, the engagement of the backgear 11b and the second F.F. gear 6Kb makes and the rotating force of the first F.F. gear 6Ka that main drive gear 6b meshes can be delivered to F.F. bar 10, and is irrelevant with the first and second F.F. gear 6Ka and the friction load on the 6Kb that are applied to respect to F.F. bar 10.It is also noted that label 25 represents a bias spring.The end that is used to force first and second control levers 23 and 11 contacts so that form friction with the third and fourth cam 13cf and 13cg respectively near cam 13c.

The mode of operation of the cassette player of Gou Chenging is as described below in a manner described., before the working method under arbitrary mode of operation, at first to be illustrated at the explanation cassette tape recorder cam 13c.

As mentioned above, cam 13c goes up the external edge of tooth punching along being provided with anodontia position 13ca, 13cb and 13cc.Make small diameter gear 13bb and the anodontia position 13ca of the 3rd relay gear 13b when cam 13c is in a position, during any one alignment among 13cb and the 13cc, just remain on a kind of pattern selected in the various patterns.Specifically, when small diameter gear 13bb alignd with anodontia position 13ca, cassette tape recorder was in forward drive information playback pattern; When small diameter gear 13bb alignd with anodontia position 13cb, cassette tape recorder was in reverse drive information playback pattern; And when small diameter gear 13bb alignd with anodontia position 13cc, cassette tape recorder was in stop position, fast progressive die or and the recoil pattern in a kind of pattern.

Equally, according to the angle position of cam 13c, each cam 13cd to 13cg carries out its appropriate functional, thereby selects one of various operator schemes.Specifically, the first cam 13cd is used to the guide finger 13gb on the control transformation bar 13g, thereby the position of control panel 13h can be determined by selector bar 13g, adapts to select in the various operator schemes a kind of.The second cam 13ce is used to provide a kind of trigger of mode switch, this triggering is produced by cam 13c by calutron 13d, therefore, when calutron 13d is subjected to electric excitation, tabular 13da unshakable in one's determination is released thereupon, and the cam surface of a pin 13ea on the electromagnetic arm 13e and the inclination of the second cam 13ce forms the engagement of sliding, and makes cam 13c clockwise rotate a very little distance, make the external edge edge and small diameter gear 13bb engagement of the tooth punching of cam 13c, as shown in figure 10.In case the external edge of the tooth punching of small diameter gear 13bb and cam 13c along between formed this engagement, cam 13c just rotates in drive motor 3 drives the process of the 3rd relay gear 13b, when align with small diameter gear 13bb in follow-up next anodontia position till.

On the 3rd cam 13cf and first control lever 23 away from the end friction engagement of engaging pin 23b, thereby control the position of the engaging pin 23b on first control lever 23 according to selected operator scheme.The end friction engagement of the four-cam 13cg and second control lever 11 is used to control the position of F.F. bar 10, just controls the first and second F.F. gear 6Ka and the 6Kb position with respect to main drive gear 6b.

Stop position (seeing Fig. 4 and 18):

When cassette player was in stop position, the small diameter gear 13bb of the 3rd relay gear 13b alignd with the 3rd anodontia position 13cc of cam 13c, as shown in Figure 4.Under this state, effect by the first cam 13cd remains on control panel 13h in the centre position of passing selector bar 13g, under this state shown in Figure 180, first and second pinch roller arms control pin 13ha and 13hb are maintained at and do not promote and the corresponding control piece 16ab of the first and second

pinch roller arm

16a and 16b and the state of 16bb, and make the first and second pinch roller 17a and 17b break away from first and second roller 1a and the 1b respectively.Break away from walking gear 6e and second spool driven wheel 6j and idle pulley 6a by the drive link 13i and the bar 9 that moves about this moment.In addition, magnetic head load bearing arm control pin 13hd be in not can to the position of magnetic head load bearing arm 20 integrant control piece 20b applied thrusts, referring to Figure 18, therefore, the magnetic head load bearing arm 20 that is loaded with magnetic head 21 is just withdrawn backward, just under the effect of bias spring 22 towards support 15 withdrawal, make magnetic head 21 almost remain on the contacted state of length part with tape T.

State shown in Figure 4 forms when cassette player just enters halted state.Correspondingly, even drive motor 3 continues forward rotation, be driven with the first F.F. gear 6Ka of main drive gear 6b engagement, F.F. bar 10 but can not move, because the engaging pin 23b that fixes with first control lever 23 is embedded among the engaging groove 10c of F.F. bar 10, therefore can also make the second F.F. bar 6Kb, keep separating, thereby make the second spool 7b keep static with the second spool driven wheel 6i.Therefore, before arriving stop position, in a flash, do not move on the length of tape T.Discharge F.F. bar (seeing Fig. 5 to 7 and 13)

When F.F. bar 10 was released, the stop position shown in Fig. 4 can be switched to be recoiled or fast-forward mode, needn't change the position of cam 13c.In other words, when making it from stop position starting drive motor 3 towards the counter-rotation opposite with direction, main drive gear 6b is towards being driven in the other direction, thereby drive the first F.F. gear 6Ka, and F.F. bar 10 is pivoted as shown in Figure 5 clockwise under the guiding of

11a and 12 by the friction load that is applied on the first F.F. gear 6Ka and the F.F. bar 10, then, pin 11 and 12 moves among each first and second seam 10a and the 10b.Because the result of F.F. bar 10 pivoted motions, the second F.F. gear 6Kb and backgear 11b engagement, make the rotating force of the first and second F.F. gear 6Ka and 6Kb be delivered to F.F. bar 10 successively, and the friction load that is applied between the first and second F.F. gear 6Ka and the 6Kb is irrelevant, thereby makes F.F. bar 10 continue to clockwise rotate.The further rotation of F.F. bar 10 causes the engaging pin 23b that is fixed together with first control lever 23 to separate with engaging groove 10c in the F.F. bar 10, F.F. bar 10 is discharged, referring to Fig. 6.In 10 d/d moments of F.F. bar, the engaging pin 23b that is fixed together with first control lever 23 breaks away from the free-ended projection 10ca that is located at groove 10c, arrives position shown in Figure 7.The state of cassette player after F.F. bar 10 shown in Figure 7 has been released that is in stop position as shown in figure 13.Under this state, to align with the groove of the 3rd cam 13cf near an end of first control lever 23 of cam 13c, and during the state of Fig. 4, separate with its maintenance, can adjust F.F. bar 10 this moment, also is the same in Fig. 5 and the dispose procedure shown in 6.Yet, in case F.F. bar 10 is released as shown in figure 10, first control lever 23 just pivots under the bias force effect of spring 25 clockwise, makes the end near first control lever 23 of cam 13c form rubbing contact with the 3rd cam 13cf gradually, referring to Fig. 7.Recoil pattern (seeing Fig. 8,17 and 18)

If from the status triggering and the forward drive drive motor 3 of Fig. 7 and 13, main drive gear 6b just clockwise rotates around pivot.At this moment, second control lever 11 and four-cam 13cg engagement make F.F. bar 10 pivot towards main drive gear 6b by pin 11a, thereby make the first F.F. gear 6Ka and main drive gear 6b engagement.By the engagement between the first F.F. gear 6Ka and the main drive gear 6b, the second F.F. gear 6Kb is engaged to the second spool driven wheel 6i, drives the second spool 7b high-speed rotation by the second spool gears 6j, thereby realizes the recoil of tape T length.In the recoil process of tape T length, the first and second pinch roller 17a separate with 1b with the corresponding first and second roller 1a with 17b, and the magnetic head 21 that is contained on the magnetic head load bearing arm 20 is remained on the position that almost touches tape T length part, the situation during stop position by spring 22 biasings.Fast-forward mode (seeing Fig. 9,16 and 18)

If begin forward drive drive motor 3 from the state shown in recoil state or Fig. 7 and 13, main drive gear 6b is just driven clockwise, and F.F. bar 10 relies on the engagement between the first F.F. gear 6Ka and the main drive gear 6b and pivots clockwise.At the pivot of F.F. bar 10 between moving period, the second F.F. gear 6Kb and backgear 11b engagement, because the engagement between the backgear 11b and the second F.F. gear 6Kb, F.F. bar 10 towards primary importance around the pivot high-speed rotation, the second F.F. gear 6Kb meshes with the first spool driven wheel 6g on primary importance, thereby, realize the quick propelling on the tape T length by the first volume shaft gear 6h high-speed driving first spool 7a.Even under this fast-forward mode, the first and second pinch roller 17a and 17b still disengage with corresponding first and

second roller

1a and 1b, and being contained in the biasing that magnetic head 21 on the magnetic head load bearing arm 20 is subjected to spring 22, magnetic head 21 is maintained at the position that almost touches tape T length part as the situation of stop position.Forward drive playback (seeing Figure 11,14 and 19)

As mentioned above, at any one stop position, recoil mould or and fast-forward mode during, cam 13c is location like this with respect to the 3rd relay gear 13b, promptly makes small diameter gear 13bb align with the anodontia position 3cc of cam 13c.Begin and be subjected to electric excitation and when making tabular 13da unshakable in one's determination break away from permanent magnet as calutron 13d from this state, cam 13c can with the second cam 13ce on the effect of the pin 13ea that is fixed together of electromagnetic arm 13e under rotate certain distance a little clockwise, reach the state shown in Figure 13.At this moment, cam 13c is in the position engaged with small diameter gear 13bb, therefore, because drive motor 3 is towards forward drive, the power that rotates counterclockwise of main drive gear 6b can be delivered on the cam 13c by the second and the

3rd relay gear

13a and 13b, and it is clockwise rotated.Further drive drive motor 3 and can take cam 13c to a certain position towards positive dirction, the first anodontia position 3ca is alignd with the position of engagement of the small diameter gear 13bb of the 3rd relay gear 13b, form the forward drive replay mode shown in Figure 11 and 14.

In the process of forward drive replay mode transition, second control lever 11 pivots counterclockwise from the state shown in Figure 10 under the effect of four-cam 13cg, make the first F.F. gear 6Ka and main drive gear 6b engagement, thereby having made into, bar 10 pivots in the counterclockwise direction, simultaneously, first control lever 23 pivots under the effect of the 3rd cam 13cf counterclockwise.Therefore, the engaging pin 23b on first control lever 23 is accepted within the engaging groove 10c in the F.F. bar 10, so that adjust F.F. bar 10 under the forward drive playback mode shown in Figure 11 and 14.At this moment, second control lever 11 makes F.F. bar 10 move certain angle towards a direction under the effect of four-cam 13cg, thereby make F.F. gear 6Ka break away from main drive gear 6b, therefore, the rotation of main drive gear 6b can not be delivered on any one first and second F.F. gear 6Ka and the 6Kb, so just can not have the load of rotation to be added on the drive motor 3.

During the forward drive replay mode, under the effect of the first cam 13cd, move by the 3rd relay gear 13b at the control panel 13h that mediates during the stop position towards the first roller 1a, as shown in figure 19, first pinch roller arm control pin 13ha promotes the control piece 16ab of the first pinch roller arm 16a, makes the first pinch roller 17a and the first roller 1a form to drive and contacts.At this moment, this drive link 13i that moves through of control panel 13h makes walking gear 6e and idle pulley 6f engagement with the bar 9 that moves about, thereby drive the first spool 7a by the first spool driven wheel 6g and first volume arbor wheel 6h, realize that the forward drive of the information on the tape T length is reset.At this moment, the control element 20b of magnetic head load bearing arm 20 is subjected to the promotion of magnetic head load bearing arm control pin 13hd, and as shown in figure 19, thereby the bias force that promotes to be loaded with the magnetic head load bearing arm 20 resistance springs 22 of magnetic head 21 partly advances towards the length of tape.Reverse drive playback (seeing Figure 12,15 and 20)

State when cassette player is set at the reverse drive replay mode is shown in Figure 12 and 15, in this state, tabular 13da unshakable in one's determination is discharged from permanent magnet and cause after cam 13c and the 3rd relay gear 13b mesh being encouraged owing to calutron 13d during the above-mentioned forward drive playback mode, if the state of resetting from forward drive further drives drive motor 3 towards positive dirction, the second anodontia position 13cb of cam 13c is alignd with the small diameter gear 13bb of the 3rd relay gear 13b.Under this reverse drive replay mode, move towards the position of the contiguous second roller 1b in residing centre position during making control panel 13h pass stop position from the position of the contiguous first roller 1a by means of the effect of the first cam 13cd by selector bar 13g, as shown in figure 20, second pinch roller arm control pin 13hb promotes the control element 16bb of the second pinch roller arm 16b, makes the second pinch roller 17b and the second roller 1b form to drive and contacts.At this moment, this drive link 13i that moves through of control panel 13h makes walking gear 6e and idle pulley 6f mesh with the bar 9 that moves about, thereby drive the second spool 7b by the second spool driven wheel 6i and the second spool gears 6j, realize that the reverse drive of the information on the tape T length is reset.This moment, the control element 20b on the magnetic head load bearing arm 20 was subjected to the promotion of magnetic head load bearing arm control pin 13hd as shown in Figure 20, thereby the bias force that promotes to be loaded with the magnetic head load bearing arm 20 resistance springs 22 of magnetic head 21 partly advances towards the length of tape.

It should be noted that, if calutron 13d is subjected to electric excitation during the reverse reproduction pattern, make tabular 13da unshakable in one's determination discharge from permanent magnet, the pin 13ea that is fixed together with electromagnetic arm 13e just acts on the second cam 13ce, make cam 13c clockwise direction turn over certain angular distance, make small diameter gear 13bb and cam 13c engagement.Consequently, drive motor 3 towards positive dirction by continuous drive during, cam 13 is rotated by small diameter gear 13bb, and is suspended when small diameter gear 13bb is brought to the 3rd anodontia position positions aligning with cam 13c.Therefore, even cam 13c suspend and small diameter gear 133bb as mentioned above with state that the 3rd anodontia position 13cc aligns during, second control lever 11 also can rotate counterclockwise around pivot under the effect of four-cam 13cg, make the first F.F. gear 6Ka and main drive gear 6b engagement, because the engaging pin 13b on first control lever 23 is received within the engaging groove 10c in the F.F. bar 10, the second F.F. gear 6Kb can not be engaged on the second spool driven wheel 6i.Therefore just can avoid the unnecessary operation on the tape T length.

The details of drive gear mechanism 6 and model selection mechanism 13 has been described in the above description, whole power required in their operation are all transmitted by drive motor 3, gear wheel in large diameter 5a by neutral gear 5, neutral gear 5 be by with the integrant coaxially gear wheel in large diameter 2ba of the second flywheel 2b, by the first relay gear 6a, finally drive by the first endless belt 4a again by main drive gear 6b.In this manner and since be by neutral gear 5 transmit except with the first flywheel 2a that the first roller 1a coaxial drive is connected the power of drive system, the pulling force on the second endless belt 4b can be reduced to minimum.This point can realize by the structure of Figure 21, in this structure, for the engagement between the gear wheel in large diameter 6aa of the gear wheel in large diameter 5a that replaces neutral gear 5 and the first relay gear 6a, between the gear wheel in large diameter 6aa of the gear wheel in large diameter 2ba of the second flywheel 2b and the first relay gear 6a, used intermediate drive gear 30, therefore, the power on the second flywheel 2b that is formed by the driving of drive motor 3 can be delivered to the first relay gear 6a by intermediate drive gear 30.

From above as can be seen, because magnetic tape sound reproducer of the present invention is equipped with rotating actuator, be used for that the rotation of drive motor is delivered to drive gear mechanism and remove to drive magnetic tape core, this gear train comprise be used for the transmission of power of drive motor to the second coaxial flywheel of second roller on first endless belt, comprise be located at second flywheel coaxially on the neutral gear of a gear being meshed of gear, and be used for the rotation of neutral gear be delivered to the first coaxial flywheel of first roller on second endless belt.Therefore, even also can the endless belt in the process of carrying out any one F.F. and recoil by the forward and the reverse drive of drive motor on tape length be subjected to pulling face and loosen mask has equal lengths, and can select required minimum tractive force for use, thereby the rotation load on the minimizing endless belt, obtain higher transmission efficiency, just can save the energy of magnetic tape sound reproducer thus.

In addition, if adopt such structure, by the neutral gear or second flywheel transmission of power of drive motor is arrived drive gear mechanism therein, the load that is formed by drive gear mechanism is the load of endless belt only just, therefore, tractive force on second endless belt can be selected littler value, makes magnetic tape sound reproducer obtain further energy-saving effect.

Although described the present invention, should also be noted that those skilled in the art obviously can realize various changes and modification with reference to accompanying drawing and most preferred embodiment.Therefore, so long as do not break away from claims limiting the scope of the invention, this class change and modification all belong within the scope of the present invention.

Claims

1. a kind of drive system in magnetic recording and/or the replay device, be used for the rotating force of drive motor by endless belt system be delivered to respectively with coaxial first and second flywheels of first and second rollers and also by first and second flywheels be delivered to the drive gear mechanism that is used to drive magnetic tape core, thereby driving magnetic tape core, it is characterized in that

Have: rotating force that is used to transmit this drive motor (3) to first endless belt (4a) of coaxial second flywheel (2b) of second roller (1b), one be equipped with the middle power wheel (5) of a gear (5a) that is meshed with the coaxial gear (2ba) of second flywheel (2b) and one be used to transmit neutral gear (5a) turn to coaxial first flywheel (2a) of first roller (1a) on second endless belt (4b); And

The rotating force of motor (3) is delivered to second flywheel (2b) by first endless belt (4a) and drives this second flywheel (2b) and also drive magnetic tape core by drive gear mechanism (6), and is delivered to first flywheel (2a) by second endless belt (4b) and drives this first flywheel (2a).

2. according to the drive system of claim 1, it is characterized in that the rotating force of drive motor (3) is delivered to drive gear mechanism (6) by the coaxial gear (5a) of this and middle power wheel (5).

3. according to the drive system of claim 1, it is characterized in that the rotating force of drive motor (3) is delivered to drive gear mechanism (6) by the coaxial gear (2ba) of this and second flywheel (2b).

4. according to the drive system of one of claim 1-3, it is characterized in that above-mentioned drive gear mechanism (6) comprises a spool gear train (6) that is used to drive magnetic tape core, one is used for the cam driving gear system (13) that drive pattern is selected cam, a walking gear (6a) that is used for changing forward or backwards tape running direction, and F.F. gear that is used to be transformed into the fast-forward mode or the pattern of recoil (6ka, 6kb).