CN2312507Y - Mechanism for reproducing tape cassette recorder - Google Patents

Abstract

The utility model relates to a mechanism (10) for reproducing a tape cassette recorder, which comprises a left tape disk shaft, a right tape disk shaft, a plurality of gears which are arranged among the motor (7) and the two tape disk shafts for transferring driving force, a plurality of operation components (11-16) which are arranged for controlling the work of each gear to make the utility model to perform various functions of the tapes, and a lock member can move between a locking position and a locking-release position, and a release mechanism (60), wherein the motor (7) drive and rotate tape cassettes to oppositely run; the locking position can lock the operation components to a work position; the locking-release position can release the operation components from the work position; the release mechanism (60) can make the two tape disks stop to automatically move lock components to the locking-release position when the tapes rotate to the end.

Description

The tape playback mechanism

The present invention relates to a kind of tape playback mechanism of energy auto stop.

As usual, existing tape playback mechanism, even be not all, great majority all have the usefulness that makes mechanism's auto stop when automatic shutdown function forwards end to for tape.The shutdown tension force that automatic shutdown function depends on tape usually works, and the shortcoming of this practice is to make tape be subjected to excessive tension force inevitably.

The objective of the invention is to manage to eliminate or reduce at least this class shortcoming.

Tape playback mechanism provided by the invention comprises: left and right sides reel shaft, rotate by a direct motor drive, and make the reverse tape transport of tape of mechanism controls; A plurality of gears are located between described motor and two reel shafts, for the usefulness of transmission of drive force; A plurality of control members dispose to such an extent that make its action of controlling each gear make mechanism can fulfil the various functions of tape; Locking component can move between latched position and latch-release position, and the former is locked in the working position with described control member, and the latter frees described control member from the working position; And release component, automatically locking component is moved on to the latch-release position when forwarding end to two reel shafts are stopped, thereby this release component disposes to such an extent that make it be subjected to two reel shafts to rotate the skew effect that is produced and suffer restraints and promoted locking component before tape forwards end to for tape.

Tape playback mechanism of the present invention preferably is equipped with actuator, release component then disposes to such an extent that be actuator and can promote locking component when two tep reels stop operating because of tape forwards end to after catching, and described release component was caught by actuator before tape forwards end to because of the skew effect is unlikely.

Can promote locking component when two tape spool dishes stop operating because of tape forwards end to thereby the actuator that not so also can make tape playback mechanism of the present invention disposes to such an extent that can catch release component thereby it is worked, described release component was caught by actuator before tape forwards end to because of the skew effect is unlikely.

Thereby better situation be with actuator dispose make its before tape forwards end to, impel release component reciprocating have only when two reel shafts stop operating because of tape forwards end to, just catch release component.

In a most preferred embodiment of the present invention, actuator is formed by a cam, its effect is to make release component reciprocating to offset above-mentioned skew effect, and the profile of described cam is to catch release component to use when radially extended spot forms step for skew effect disappearance.

Better situation is to make release component that the part of a bifurcated is arranged, and the two ends of this forked section are for supporting cam wheel usefulness, and promptly a divergent ends rests on the step of cam release component because of the skew effect is returned when not going back therein.

In a most preferred embodiment, the skew effect is provided by a displacement member, displacement member and one of them reel shaft is angled is frictionally engaged.

Better situation is that displacement member has a crank that engages with the part of release component, uses for the skew release component.

Than above-mentioned also better situation be, this part of release component have two edges alternately to engage with crank in case make release component no matter one of them axle of described two reel shafts toward which direction rotate and can be offset along same direction.

In a most preferred embodiment, thereby one of them is with so that mechanism enters the control member system of break-off mode disposes to such an extent that spring of its control is suspended and tape makes the release component skew when not forwarding end to as yet under the break-off mode at two reel shafts.

Better situation is, described spring assembly is therein on control member.

Referring now to accompanying drawing, only illustrates in greater detail content of the present invention with the form of giving an example.

Fig. 1 is the front elevation of an embodiment of tape playback mechanism of the present invention;

Fig. 2 is the rear view of Fig. 1 mechanism;

Fig. 3 A and 3B are two the action button sheets of Fig. 1 mechanism and the front elevation of relevant locking saddle thereof, show its corresponding situation in magnetic tape reproducing and stall operation;

Fig. 4 is the cross sectional side view that the right reel shaft of Fig. 1 mechanism comprises crankwheel;

Fig. 5 is the front perspective view of Fig. 4 crankwheel;

Fig. 6 is the front elevation of the cam shaft gear of Fig. 2 mechanism;

Fig. 7 is the rear view of Fig. 2 mechanism reciprocator;

Fig. 8 is the rear view of Fig. 7 traverse member, shows the crankwheel of Fig. 5 and the cam of Fig. 6 and how to affact on the traverse member;

How the cam shaft gear that the rear view of Fig. 9 A to Fig. 9 D shows Fig. 6 affacts on the traverse member of Fig. 7, and how about traverse member affacts on the locking saddle of Fig. 3 A and 3B;

The rear view of Figure 10 A and Figure 10 B shows on the traverse member how the elbow spring to affact Fig. 7.

At first, there is shown the tape playback mechanism 10 of one embodiment of the invention referring to Fig. 1 to Fig. 3 B of accompanying drawing.Playback mechanism 10 has a series of 6 action button sheets, be REC (recording), PLAY (playback), REW (rewinding), FF (fasting forward), STOP (stopping) and PAUSE (time-out) button piece 11 to 16, also have installing plate 17 and supporting button piece 11 to 16, these all are that the present technique field is known.Playback mechanism 10 has a pair of left and right sides reel shaft 8 and 9 to be driven around separately axis by corresponding coaxial driven wheel 8W and 9W to rotate along opposite direction X and Y.Left side axle 8 and the angled positive engagement of driven wheel 8W.Right axle 9 engages with the angled sliding friction of driven wheel 9W.Playback mechanism 10 also has a motor 7 to rotate along directions X by means of belt 36 driving flywheels 32.Flywheel 32 drives swing clutch couplinges 40 by means of belt 39 again and rotates along directions X, drives the cam wheel 34 with actuating cam member 35 (also referring to Fig. 6) with the coaxial pinion wheel 33 of flywheel 32 and rotates along the y direction.On the same axle of dress clutch coupling 40 gear 28 and belt pulley 29 are housed, belt 39 promptly is enclosed within on the belt pulley 29.Gear 28 and pinion wheel 28A are on same axis, and the former is connected with belt pulley 29 by the sliding friction engagement of certain angle.

Electric power is supplied to motor 7 through switch 6.As long as motor 7 runnings, flywheel 32 and cam shaft gear 34/ cam member 35 are turned over regard to driving.

Action button sheet 11 to 16 is subjected to the effect of each spring and flexibly outwards is offset.Switch 6 be dispose when pressing button sheet 11 to 14 (stop button sheet 15 and pause button sheet 16 exception) closure, motor is got.Each button piece 11 to 14 all has side tabs 18.Playback mechanism 10 has a locking slide plate 19 to dispose to such an extent that make it that specific button sheet (stopping and pause button sheet 15 and 16 exceptions) is locked in the position that it is pressed, and makes playback mechanism 10 go specific tape and operates.Thereby disc spring 50 affacts the arm 22 of saddle 19 makes locking saddle 19 resilient bias slide along the direction of P.Locking saddle 19 is formed with 20, two hooks of hook of tool inclination cam edge 21 all towards the P direction in each position corresponding to button piece 11 to 14.Each cam edge 21 is to establish for the contact pin 18 with each button piece (for example playback button sheet shown in Fig. 3 A) overlaps when each button piece is pressed, thereby locking saddle 19 is slided along opposite direction Q in face of the direction of spring 50 acting forces.Follow relevant hook spare 20 and described contact pin 18 is being hooked when direction P returns, so that the playback button sheet 12 that locking is pressed as shown in Fig. 3 B, makes playback mechanism 10 can carry out the replay operations of tape.

Stop button sheet 15 also has side direction contact pin 18 ' for riding over when being pressed on the locking saddle 19 similar inclination cam edges 21 ' locking saddle 19 to be slided along direction Q in face of the direction of spring 50 effects, so that for example the playback button sheet 12 with original pressurized/locking discharges, thereby motor 7 is opened circuit.

Fig. 4 and Fig. 5 referring to accompanying drawing.What drive that right axle 9 rotates is not only gear 9W, and also has coaxial second the gear 9W ' that is located at first gear 9W back.Second gear 9W ' is opposite with first gear 9W, angled and right axle 9 positive engagement.Second gear 9W ' disposes to such an extent that make it drive coaxial crankwheel 30 rotations that are located at thereafter by the sliding friction joint.Crankwheel 30 (it has a toggle-action lever 31) is pressed to second gear 9W ' by coaxial under the effect of disc spring 37.Gear 9W and 9W ' mesh with corresponding idle pulley 26 and 27 all the time.Clutch coupling 40 disposes to such an extent that make its gear 28 between gear 8W and 27, and its pinion wheel 28A adjoins gear 26.

During work, when push playback button sheet 12 (together with or not together with recording button piece 11) time, 26 swings of Sui's wheel, pinion wheel 28A engagement with clutch coupling 40, pinion wheel 28A is rotated, so that driven wheel 9W thereby also drive right axle 9 it is rotated with the rated revolution of magnetic tape reproducing (or recording) along directions X along the Y direction.When pushing FF button piece 14, thus clutch coupling 40 put a side and make its gear 28 and idle pulley 27 engagements, with by the idle pulley 27 driven wheel 9W ' that rotate along the Y direction thereby also drive right 9 it is rotated along directions X with the higher rotation speed that tape fasts forward.When pushing REW button piece 13, thus clutch coupling 40 put opposite side and make its gear 28 and gear 8W engagement, thereby so that make gear 8W also make left side axle 8 with same high rotational speed but in the other direction Y rotate, to carry out rewinding.

Playback mechanism 10 have remove when the automatic shutdown function element forwards to for tape action button sheet 11 to 14 be subjected to by state, thereby motor 7 is opened circuit and need not rely on the shutdown tension force of tape, thereby avoid magnetic tape tension excessive.This function element is by playback mechanism 10 controls.

The automatic shutdown function element is formed by cam shaft gear 34/ cam member 35 and crankwheel 30/ toggle-action lever 31, and comprises traverse member 60 (being shown in Fig. 7 separately).Traverse member 60 can swingingly support around axis 61, and it has: with the bifurcated C shape part 62 of an integral body of its formation, one end 63 is shorter, and the other end 64 is longer; Triangle frame 65, its first and second arm 67 and 67 is located at the same side of axis 61; With finger body 68, be located at the opposite side of axis 61.C shape part 62 is settled to such an extent that make its inboard 62 ' around cam member 35.65 of triangle frames are settled to such an extent that make it round toggle-action lever 31.

Referring now to accompanying drawing, Fig. 8.At normal magnetic tape reproducing, record or when fasting forward operation, right axle 9 is driven along directions X by the first or second gear 9W or 9W ' and rotates, crankwheel 30 also rotates in the direction.But the stopping of first arm 66 that the rotation of crankwheel 30 is fixed toggle-action lever 31 because of the triangle frame 65 that is subjected to traverse member 60 stops.This skids the friction engagement between the second gear 9W ' and the crankwheel 30, thereby the second gear 9W ' can be rotated further, and impels crankwheel 30 to produce along the tendency or the skew of the swing of T direction and move.

The profile of cam member 35 is similar to figure " 6 " or " 9 ", and its eccentric peripheral profile radially enlarges along the T direction, forms radially step 35B.Cam member 35 is constantly when the Y direction is rotated, thereby short end 63 to the long end 64 from C shape part 62 scans the inboard 62 ' of pushing down C shape part 62 repeatedly, thereby traverse member 60 is periodically swung against the offset direction directions X of crankwheel 30, thereby make traverse member 60 by the certain angle to-and-fro movement.Thereby short end 63 is short as to be enough to make crank 430 that it is in time returned when the cycle of scanning begins at every turn at cam member 35 by certain angle unlikelyly to be caught by cam steps 35B.Therefore, the effect of described skew action is to prevent that traverse member 60 from being caught by cam member 35.

In the process of normal rewinding operation, left side axle 8 is driven along the Y direction by gear 8W and rotates, and right axle 9 also and then rotates together with the second gear 9W ', with the tape pull-up along Y direction backward rotation.So crankwheel 30 is equally along T direction backward rotation.Crankwheel 30 is subjected to the stopping of second arm 67 of traverse member 60 triangle frames 65 fixed crank bars 31 and stops backward rotation.Because second arm 67 and the first arm 66 the same the same sides that are located at axis 61, the reverse skew action that crankwheel 30 produces impels traverse member 60 to rotate along the T direction equally, this with above-mentioned magnetic tape reproducing, record or the situation of fasting forward the same.Therefore, traverse member 60 produces above-mentioned angled to-and-fro movement.

Referring now to accompanying drawing, Fig. 9 A to 9D.At magnetic tape reproducing, record, fast forward or the operating process of rewinding in, a right axle 9 (thereby also make with its positive engagement the second gear 9W ') and a left side 8 (thereby also making the gear 8W that engages) are stopped operating.In the process of playback or recording operation, the first gear 9W that is frictionally engaged can and not cause motor 7 stall and make tape be subjected to excessive tension force with respect to right axle 9 slips.Fast forward or the process of rewinding operation in, clutch gear 28 can slide and not cause motor 7 stall and make tape be subjected to excessive tension force with respect to clutch pulley 29.Under above-mentioned each situation, gear 9W ' can stop operating and fail in crankwheel 30, thereby stops the skew effect of 30 pairs of traverse member 60 of crankwheel.Cam shaft gear 34 and cam member 35 are by still being driven and along Y direction rotation (Fig. 9 A and 9B) at the motor 7 of operation.

Do not have the above-mentioned skew action of returning by certain angle (this hour offset action disappears), (Fig. 9 C) be caught next time and be engaged with this step to the short end 63 of C shape part 62 will when the cycle of scanning begins at cam member 35 by cam steps 35B.Make traverse member 60 along the directions X swing when cam member 35 is rotated further once more, but the amplitude of swing is more farther than in the past, refers to body 68 more past protracting thereby make.Refer to that body 68 contacts the arm 22 of lock slide 19 (Fig. 9 D), thereby lock slide 19 slided along the Q direction, thus discharge relevant record, playback, rewinding or the push button element that fasts forward, and then cut off the power supply that is fed to motor 7.

Last Figure 10 A and 10B referring to accompanying drawing.Time-out knob sheet 16 alternately is in recessed and protruding position when being pressed continuously, and elbow spring 51 is housed on the pause button sheet 16.Elbow spring 51 is in tension all the time, and a pair of closure that its upper arm 52 stretches into lock slide 19 arms 22 rightly refers in the body 23, arrives the position near a side 69 of traverse member 60.When pause button sheet 16 is in raised position (Figure 10 A), spring arm 52 does not contact with described side 69.When pushing pause button sheet 16 (Figure 10 B), spring arm 52 is subjected to thrust by finger body 23, thereby flexibly pushes down described side 69, and traverse member 60 is offset along the Y direction.

Mechanism 10 is in magnetic tape reproducing, records, fasts forward or during the rewinding mode of operation, pushes pause button sheet 16 and left side axle 8 or right axle 9 are stopped operating and enters halted state, and at this moment tape is along not forwarding end to.Meeting termination crank member 30 is applied to and makes its skew effect of rotating on the traverse member 60 on the Y direction though left axle 8 or right axle 9 stop operating, and at this moment the spring arm 52 of elbow spring 51 flexibly leans against the side 69 of traverse member 60 thereby described skew action is worked.Therefore, the above-mentioned angled to-and-fro movement meeting of traverse member 60 continues, thereby otherwise lock slide 19 can be slided because of the finger body 68 of traverse member 60 mistake relevant record, playback, rewinding or the button sheet that fasts forward discharge, thereby playback mechanism 10 main operations stopped.

The structure and the principle of work of playback mechanism 10 all the other each several parts and parts are that the present technique field is known, therefore do not give unnecessary details here.

The present invention only proposes by way of example, is not breaking away from the present invention under the prerequisite of the scope described in this instructions appended claims, and the experts in present technique field can carry out various modifications and/or change to the foregoing description.

Claims (8)

1. tape playback mechanism comprises: left reel shaft and right reel shaft, rotated by a direct motor drive and to make the magnetic tape cassette subtend tape transport that is subjected to the control of tape playback mechanism; A plurality of gears are located between described motor and two reel shafts, use for transmission of drive force; A plurality of control members dispose to such an extent that make it control the work of each gear so that make playback mechanism fulfil the operation of tape; Locking component can move between latched position and latch-release position, and latched position is the position that described control member is locked in the working position, and the latch-release position is the position that described control member is freed from the working position; And release component, automatically locking component is moved on to the latch-release position when forwarding end to two reel shafts are stopped, thereby this release component disposes to such an extent that make it be subjected to two reel shafts to rotate the skew effect that is produced and suffer restraints and promoted locking component before tape forwards end to for tape.

2. tape playback mechanism as claimed in claim 1, it is characterized in that, also comprise actuator, form by a cam, its effect is to make release component reciprocating to offset above-mentioned skew effect, and the profile of described cam is to catch release component to use when radially extending to form step for skew effect disappearance.

3. crossed belt playback mechanism as claimed in claim 2, it is characterized in that, release component has the part of a bifurcated, and the two ends of this forked section are for supporting cam wheel usefulness, and promptly a divergent ends rests on the step of cam release component because of the skew effect is returned when not going back therein.

4. as the described tape playback mechanism of above each claim, it is characterized in that the skew effect is provided by a displacement member, displacement member and one of them reel shaft is angled is frictionally engaged.

5. tape playback mechanism as claimed in claim 4 is characterized in that, displacement member has a crank that engages with the part of release component, uses for the skew release component.

6. tape playback mechanism as claimed in claim 5, it is characterized in that, the described part of release component have two edges alternately to engage by crank axle in case make release component no matter one of them axle of described two reel shafts toward which direction rotate can be along same direction skew.

7. as the described tape playback mechanism of above each claim, it is characterized in that, described control member comprises that an one usefulness is so that mechanism enters the control member of break-off mode, it has a controllable spring, in order to suspend at two reel shafts and tape makes the release component skew when not forwarding end to as yet under the break-off mode.

8. tape playback mechanism as claimed in claim 7 is characterized in that, described spring is mounted in it on the control member.

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