CN87103591A - The auto-stop mechanism of drive - Google Patents
The auto-stop mechanism of drive Download PDFInfo
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- CN87103591A CN87103591A CN87103591.XA CN87103591A CN87103591A CN 87103591 A CN87103591 A CN 87103591A CN 87103591 A CN87103591 A CN 87103591A CN 87103591 A CN87103591 A CN 87103591A
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Abstract
A kind of auto-stop mechanism of drive has: prevent member, control member prevented at operating position, and with its interlock; The rotation detection means, be contained on the reel seat can be to the left and right either party to rotation, and rubbing contact between the reel seat; Oscillating structural member has sliding contacting part, and either party is subjected to rotating the trend that the oriented side of revolving force of detection means swings to when rotation to the left and right when the reel seat; The cam plectane has the ring-type offset cam and engages with the sliding contacting part of oscillating structural member and be positioned at the junction surface that deviates from offset cam; The releasing member that can swing has the pushing portion that member is prevented in pushing, and the supporting block plectane rotates freely.
Description
The present invention relates to a kind of auto-stop mechanism of drive, thereby the rotation that it can detect the reel seat that causes because of the tape incoming terminal stops to make the magnetic tape drive source to stop, operating state is set reset into primary position with control member.
For example at blattnerphone, VTR(video tape recorder) etc. in the tape drive unit, the well-known existing rotation that detects the caused reel seat in magnetic tape terminal stops, and uses to remove playback (elephant) and (PLAY) wait the used auto-stop mechanism of operating state.
The auto-stop mechanism of traditional drive, its constituted mode are to be changed by magnetic tape tension to detect tape to terminal.That is, on the support plate of supporting head, be equipped with the magnetic tape tension detection arm.And the front end of magnetic tape tension detection arm (tension arm) is urged on tape, makes the state walking of tape with local bending.
In tone playing state (PLAY) or recording state (REC), tape just is tightened up when the tape incoming terminal, and at this moment the tension force of tape is anxious increases sharply greatly.Therefore, the tape that local bending will become directly, and tape just pushes back tension arm.Utilize moving of tension arm at this moment, magnetic tape drive source etc. is stopped, the control member of tone playing state etc. is restored to primary position.
But utilize the auto-stop mechanism of the tension arm of aforesaid way, have following shortcoming.
(1) because tape is pushed with the state of local bending by tension arm walks, so the damage of tape ahead of time.Resistance during again owing to the tape walking increases, thus corresponding with the increase of this resistance, be necessary further to strengthen the crimp force of pinch roller to capstan.But in a single day the crimp force of pinch roller strengthens, and capstan can be subjected to a big side pressure effect, thereby must support capstan securely, so that the design of the bearing portions of capstan becomes very difficult.
(2) because tape is by crooked partly, it is unstable that the walking of tape becomes, and especially its unstable degree such as seam crossing at tape are more obvious.In addition, because tension arm is assembled on the support plate of magnetic head, be positioned near the magnetic head place, the unstable degree of tape walking has very big influence to playback, recording characteristic, causes acoustic characteristic to reduce.
(3), partly be difficult to be designed to and carry out parallel moving with high precision with contact with tape on the tension arm because tension arm is the movable link mobile with the change of magnetic tape tension.Therefore, this contact with tape part is easy to generate heterogeneity to the contact pressure that tape applied on the tape width direction, have the problem that tape is moved at Width, also has the problem that makes tape produce warpage.
(4) in addition, when express delivery state (FF) or the state that unrolls (REW), because support plate position in the early stage, so the tension arm on the support plate is positioned at the position of leaving tape.Therefore can not detect the magnetic tape terminal, so at the express delivery state or when unrolling state, auto-stop mechanism also is failure to actuate when the tape incoming terminal.In addition, also should consider to make the structure of tension arm contact tape at the express delivery state or when unrolling state, even but this structure, when express delivery or when unrolling state, because the speed of travel of tape is too fast, thereby make magnetic tape tension also become big thereupon, thus tape during to terminal magnetic tape tension and express delivery or the difference of the magnetic tape tension when unrolling state become very little.Therefore, the auto-stop mechanism of above-mentioned traditional form will make it move very difficulty under the express delivery state or the state that unrolls.
Therefore the purpose of this invention is to provide a kind of auto-stop mechanism of drive, no matter this mechanism is in tone playing state, and recording state, or express delivery state make this auto-stop mechanism action thereby the state that unrolls all can be used to detect tape to terminal.
In order to achieve the above object, thus the formation of auto-stop mechanism of the present invention be with mechanical means detect when tape incoming terminal reel seat stop to make this auto-stop mechanism produce action.
That is, installing rotation detection means on the reel seat, this member any one direction to the left and right rotates freely, and makes this detection means utilize the contact friction between it and the reel seat and be subjected to and the equidirectional acting force of reel seat.Therefore, detection means have the acting force effect during, expression reel seat rotates, and when acting force one disappears, represents that then the reel seat has been in halted state.
In addition, rotation detection means pushing oscillating structural member, when any the direction rotation to the left and right of reel seat, oscillating structural member is subjected to the acting force towards certain orientation.Oscillating structural member possesses sliding contacting part, set offset cam sliding contact on this sliding contacting part and the rotatable ring-type cam plectane, and when it one when resting on the position that deviates from offset cam, promptly contact with set joint portion on the cam plectane.
In addition, being provided with the releasing member is used for supporting the cam plectane and it can be rotated freely.This releasing member possesses has pushing portion to be used for pushing the prevention member.In addition, prevent member to be used for making control member (for example playback operation member) to stop on its operating position, control member is used for making drive to be in operating state.
Therefore and since the reel seat stop the suffered acting force of rotation detection means is disappeared the time, the sliding contacting part of oscillating structural member rests on the position of the offset cam that leaves the cam plectane, contacts with the joint portion of cam plectane.Therefore, the releasing member is subjected to swinging from the opposite force of sliding contacting part, utilize this to swing the driving path of interdicting, utilize the pushing portion that removes member to push simultaneously and prevent member to move it, use the prevention of removing control member from the cam plectane to the reel platform.
One embodiment of the invention are described below with reference to accompanying drawings.
The essential structure of cassette recorder 10 is with traditional identical, as shown in Figure 1 and Figure 2, in the former configuration of the base plate of being made by sheet metal 14 a plurality of (for example 6) control member 16 to 21 that can be pressed into arranged.In the end of these control members 16 to 21, the button of not representing among the figure is housed.4 control members 16 to 19 on the left side for set recording, playback, unroll, the operating state of express delivery etc. uses.Control member 20 makes to stop to finish ejection operation usefulness, and control member 21 temporarily stops (pause) operation and uses.
Operating state is set the control member 16 to 19 of usefulness because have roughly the same shape, so be that example illustrates its structure at this with playback operation member 16.
On base plate 14, be provided with the substrate 34 that is made of plastics, and, prevent tabular movable links such as member 26 to come clamping to make operation member 16～21 between base plate 14 and the substrate 34.Be formed with concavo-convex moving direction restrictions and amount of movement restrictions (all not expressions among the figure) at the back side of substrate 34 so that above-mentioned tabular movable link is limited herein.In addition, at the back side of substrate 34, as shown in Figure 2, be provided with switch installation portion 38a, it is projected into the back side one side of base plate 14 always, is used for assembling the switch 38 of motor 36.Switch 38 possesses a pair of flexure strip of being made by conductor 39,40, is used for making the flexure strip 39 that is located at a following tortuous sheet 42 of preventing member 26 and a side opposed.In addition, prevent member 26 because being pressed into of control member 16 and when mobile, utilize tortuous sheet 42 to push the plastic sheet 43 of the front end that is assemblied in flexure strip 39 towards Fig. 1 right-hand (be left at Fig. 2) contacts two flexure strips 39,40, switch 39 is switched on, so just starting of motor 36.
In addition, recording/playback being housed is assembled on the substrate 34 with the headplate 46 of magnetic head 44.This headplate moves to the top of Fig. 1 with being pressed into of control member 17 via playback.In addition, its structure formation playback operation when recording is pressed into control member 16 also is pressed into member 17 thereupon, so headplate 46 at this moment also moves to the top of Fig. 1.Then, utilize this of headplate 46 to move, make magnetic head 44 become with tape cassete 47 in contact with tape.
In addition, erasure free to rotate is housed with magnetic head 48 on substrate 34, this magnetic head 48 moves to operating position with contact with tape via recording with being pressed into of control member 16.
In addition, be contained in pinch roller free to rotate on the substrate 34 50, at headplate when operating position moves, also move with it and with capstan 52 crimping.
According to aforesaid way, to record when being pressed into control member 17 with control member 16 or playback, magnetic head 44,48, pinch roller 50 will move to the operating position of appointment, utilize simultaneously and prevent member 26 that the switch of motor 36 is switched on, use and set desirable recording or tone playing state.
In addition, will unroll when being pressed into control member 19 with control member 18 or express delivery, and utilize and prevent member 26 that these control members are prevented at operating position, it is described in detail in this and is omitted.In addition, under any one operating state at recording, playback, express delivery, in unrolling, when being pressed into control member 20 as stopping to finish ejection, then prevent member 26 at first to move to the right-hand of Fig. 3, the operating state that is positioned at operating position is set reset into primary position with control member 16～19.Then, when stopping finish to eject when getting back to primary position, prevent member 26 because retracting spring and restoring to the left of Fig. 3 makes switch 38 disconnections with control member 20.In addition, as not setting under the situation of any operating state, be pressed into control member 20 as stopping to finish to eject, then ejecting mechanism (not shown) action rotates tape cassete retainer (not shown), so tape cassete can take out.
As mentioned above, control member 16～21 and prevent tabular movable link such as member 26, the concavo-convex moving direction restrictions at the back side by being formed on substrate 34, the amount of movement restrictions, base plate 14 location relatively, the order of its operation of packing into is as follows.At first above-mentioned tabular movable link is contained in the back side of substrate 34.Base plate 14 is thereon overlapping, again base plate and substrate are fixed.Therefore, at control member 16～21, when preventing tabular movable link such as member 26 to pack base plate into, without any need for screw, so can significantly cut down during the millwright.Assembling work can be carried out rapidly and easily for this reason, and is easy to realize assembly automation.
Yet the driving force of motor 36 is sent to capstan pulley 56 as shown in Figure 2 from motor pulley 53 through endless band 54.On capstan 52, also be equipped with pinion wheel 58, this pinion wheel and neutral gear 60 engagements.Neutral gear 60 recording or during tone playing state with reel gear (reel platform) 62 engagements of batching side, the driving force of motor is sent to batches side reel seat 66.Reel gear 62 can turn round and freely be contained on the axle (not shown) of being fixed on the base plate 14.In addition, with the reel gear 62 coaxial reel seats 66 that also are equipped with.This reel seat 66 owing to do contact friction between itself and the reel gear 62 with its rotation.In addition, be provided with the small diameter gear 68 littler in the lower end of reel seat 66 than reel gear 62, the following side that it is fixed on reel gear 62, be used for base plate 14 on idle pulley 69 intermesh.
In addition, as shown in Figure 2, the motor driven power that is sent to capstan pulley 56 is sent to express delivery through another one endless band 70, unrolls with pulley 72.But this pulley 72 is supported in the following side of FF/REW conversion rod 74 becomes free rotation mode, is provided with the gear 76 coaxial with pulley 72 at the upper face side of conversion rod 74.This gear 76 is because the contact friction between itself and the pulley 72, along with pulley 72 is done counter rotation among Fig. 1.Conversion rod 74 can be to left or right-hand swing by unrolling with control member 18 or express delivery with being pressed into of control member 19.That is, will unroll when being pressed into control member 18, conversion rod 74 is to the counter-clockwise direction swing of Fig. 1, and gear 76 and reel gear (reel platform) 78 engagements of supplying with reel make supply side reel seat 80 to the clockwise direction high speed rotating.In addition, when express delivery was pressed into control member 19, conversion rod 74 made gear 76 and idle pulley 69 engagements to the clockwise direction swing, makes reel seat 66 high speed rotating that batch side.
FF/REW does not need to fix with screw with conversion rod 74, and its structure can be used one touch type (one touch) assembling.That is conversion rod 74 is made of plastics, and to shown in Figure 7, axle 82 is given prominence on body 81 as Fig. 5, has a pair of hook-shaped holding piece 84 and Extendible flake 81a at an end of body, and possessing at the body sidepiece has hook sheet 86.This conversion rod 74 is assemblied on the base plate 14 in following mode then.At first below base plate side with its partly insert be located at base plate peristome 89(with reference to Fig. 1, Fig. 2, Fig. 5) in, utilize Extendible flake 81a and holding piece 84 to clamp edge of opening 14a.Then, make axle 82 be entrenched in the pilot hole of being located on the base plate 88.At this moment the inclined-plane of hook sheet 86 be located at the edge sliding contact of the little opening of base plate 14, hook sheet 86 is elastic deformation on one side, be projected on one side the upper face side of base plate, utilize the elastic recovery of hook sheet 86 to be prevented edge, finish so the assembling of conversion rod 74 is promptly accused at above-mentioned little opening.
For the conversion rod that will make this kind mode has trend towards a side, the general structure of being familiar with is to use spring.But, in the present embodiment without exception without spring, and utilize the tension force of endless band 70, conversion rod 74 is had towards clockwise trend (with reference to Fig. 5).
In addition, the action of conversion rod 74 itself is by generally being familiar with.That is, under the state that is not pressed into control member 19 with control member 18 or express delivery that unrolls, as shown in Figure 1, gear 76 not with idle pulley 69 and supply side reel gear 78 in any one engagement, but be positioned at the centre position.But, when express delivery is pressed into control member 19, hinder the stopper (not shown) of conversion rod 74 swings to be removed, conversion rod 74 utilizes the tension force of endless band 70 to swing to clockwise direction.Gear 76 and idle pulley 69 engagements then batch side reel seat 66 and transmit tape apace with the counter-clockwise direction high speed rotating thereby make.On the other hand, when being pressed into control member 18 as unrolling, conversion rod 74 is subjected to the pushing of control member 18 and swings with counter-clockwise direction, makes reel gear 78 engagements of gear 76 and supply side, supply side reel seat 80 is used with the counter-clockwise direction high speed rotating carried out tape and unroll.
The rotation detection means 94 of auto-stop mechanism 12 as Fig. 8, shown in Figure 9, is shaped as the part annular element with a pair of arm 95, is made of plastics, and utilizes elasticity to be entrenched in the exterior circumferential of reel seat 66 from the side.Here, rotation detection means 94 can be to the left and right any one direction rotation, but because and the contact friction between the reel seat 66, make it have trend towards the sense of rotation of reel seat.Be formed with pin 95a at the front end of arm 95 and be used for pushing following oscillating structural member.In addition, reel seat 66, when unrolling state because the tension force of tape and to the clockwise direction rotation, during each operating states such as other recording, playback, express delivery then with counter rotation.
In addition, auto-stop mechanism 12 possesses oscillating structural member 96 is arranged, and when reel seat 66 any one direction rotation to the left and right, all is subjected to rotating the revolving force effect of detection means 94 and has towards clockwise trend.Oscillating structural member 96 is made for plastics, and as Figure 10, shown in Figure 11, central part in its lower section has axle 98 respectively, has hook portion 100 at the one end, has heavy hammer part 102 at its other end simultaneously, and the axle 98 of oscillating structural member 96 is installed on the substrate swingably.In addition, because the existence of heavy hammer part 102 is arranged, axle 98 is positioned on the position that is approximately center of gravity of oscillating structural member.Therefore, no matter the attitude that cassette recorder 10 uses how, oscillating structural member 96 can remain stable posture.In addition, hook sheet 106 extends to the below and combines with the edge 34a of substrate, and oscillating structural member 96 can not thrown off upward.
This oscillating structural member 96 is packed into order described below on the substrate 34.At first, the push-pads 108 times with end (left end of the oscillating structural member) 96a of heavy hammer part 102 inserts the L font that is located at substrate 34 is entrenched in axle 98 in the pilot hole 104 simultaneously.At this moment, hook sheet 106 produces elastic deformations, arrives the back side one side of substrate 34, because 106 elastic recoveries of hook sheet, promptly accuses to the installation of substrate 34 and to finish.Therefore, do not need screw to fix, can install rapidly and easily with one touch type.Here, heavy hammer part 102 often is in the relation that contacts with push-pads 108, because contact friction between the two can prevent that oscillating structural member from rocking.In addition, below oscillating structural member 96, be extended with and stop sheet 110, utilize this edge contact that stops the hole 112 on sheet and the substrate, can limit the hunting range of oscillating structural member.
Rotation detection means 94 makes a pair of arm 95 face the left hand edge 100a(of hook portion 100 with reference to Fig. 1).Therefore, when reel seat 66 rotation, rotation detection means 94 can obtain and the unidirectional revolving force of reel seat, pushes left hand edge 100a continuously with the pin 95a of the front end that is located at arm.As shown in Figure 1, when reel seat 66 during (at recording, playback or express delivery state time) with counter rotation, or when reel seat 66 rotates in a clockwise direction (when unrolling state), the pin 95a of rotation detection means 94 pushes the left hand edge of oscillating structural member 96 continuously, agitation member 96, all only has towards clockwise trend when any one direction is rotated at reel seat 66.
In addition, no matter the revolving force direction of reel seat 66 is how in order to make oscillating structural member 96 have trend towards certain orientation all the time, in the present embodiment, a pair of arm 95 is located on the rotation detection means, but also can be for example, make the left hand edge of oscillating structural member form back taper shape (that is forming V font recess), the arm of rotation detection means is one, forms the mode that pushes left taper surface or right taper surface with the leading section of this arm.
End in the hook portion 100 of oscillating structural member 96 is formed with sliding contacting part 113, and this contact site 113 is used for sliding over each other with the described offset cam 118 in back and contacts.
Above-mentioned neutral gear 60 as shown in Figure 12 and Figure 13, forms as the some of cam plectane 114.In addition, on cam plectane 114, also have gear 116 can be used to reel gear 62(with reference to Fig. 1) engagement, be formed with the offset cam 118 of ring-type in the inner recess of this gear 116.Position at the maximum displacement part of facing offset cam 118 is formed with joint portion 122, and its position is the minimum addendum modification R1 that is slightly less than offset cam 118 apart from the distance of rotation center.Cam plectane 114 is plastic products, which is provided with half moon-shaped groove 124 and is used for preventing shrinkage.Cam plectane 114 utilizes the driving force of motor 36 to rotate.In addition, in recording or tone playing state, its driving force is sent to reel gear 62, makes reel seat 66 to counter rotation.In addition, offset cam 118 inwardly is located at above the cam plectane 114 in the present embodiment recessedly, but be not limited to this kind form, for example can be located at highlightedly the cam plectane above, make its sliding contacting part and outer peripheral face sliding contact.
The turning axle 120 that is used for supporting cam plectane 114 be contained in as remove gear plate 126 that member uses below.Gear plate 126 as shown in figure 14, is formed centrally the mode that can freely rotate in capstan 52 being, and has slotted hole 128.In addition, by this slotted hole, the portion that is slidingly connected 113 of oscillating structural member 96 extends downwards, arrives offset cam 118.Because oscillating structural member 96 has to clockwise trend because of rotation detection means 94, and the portion of being slidingly connected 113 is contacted with offset cam 118.Gear plate 126 has crooked pushing portion 130 downwards, and make this pushing portion from left facing to the Extendible flake 132(that is located at the right-hand member of preventing member 36 with reference to Fig. 3, Fig. 4).
The gear 116 that gear plate 126 is maintained at this cam plectane 114 usually not with the centre position (with reference to Fig. 1) of reel gear 62 engagements.When headplate 46 moves to operating position,, thereby make gear 116 and 62 engagements of reel gear then with the counter-clockwise direction swing of gear plate 126 in Fig. 1 of its interlock.
That is, on support plate 46, as shown in figure 15, torsionspring 134 is housed.One end 134a of this torsionspring 134 prevents at the prevention sheet of being located on the substrate 34 136, and an other end 134b prevents prevention sheet 138 places at the support plate right-hand member, in addition, prevention is crossed at an other end 134b of the torsionspring of preventing sheet 138 places and is prevented sheet 138 to combine with pinch roller lever 140.In addition, utilize this torsionspring 134, make support plate 46 have trend all the time towards non-operating position (primary position).
Scheme this, when operating position moved, pinch roller lever 140 was pushed by an other end 134b of torsionspring and rotates to clockwise direction headplate 46 owing to being pressed into of control member 16 or 17.Thereby pinch roller 50 is crimped on the capstan 52, and gear plate 126 rotates with pin 144 simultaneously, makes gear 116 engagement reel gears 62.
In addition, in well-known drive, pinch roller by independently the axle be supported on the pinch roller lever.Therefore, in the time of on the pinch roller lever, will assembling pinch roller, be located at up and down between the supporting arm of pinch roller lever earlier, then an axle inserted it up and down in the center pit of supporting arm and pinch roller.In this structure, must make the branched shaft hole of the central aperture supporting arm of pinch roller carry out the insertion of axle, therefore need skilled operation, can not assemble very rapidly, and want the robotization difficulty.In addition, because also need a spindle unit in addition, so its cost height.
At this point, in an embodiment of the present invention, pinch roller lever 140 is plastic products, and as Figure 17, shown in Figure 19, it is slightly littler than the diameter of belt wheel 50a to be provided with pilot hole 148 its A/Fs on supporting arm 14b up and down.On the other hand, the central core 50b of belt wheel 50a system and pinch roller forms one and is made of plastics.In this structure,, then utilize the elastic deformation of supporting arm 146 just can finish assembling easily as long as be pressed in the pilot hole 148 from the side with belt wheel 50a.Therefore this assembling can promptly be carried out, and robotization is easy, and does not need an independently spindle unit, so cost can reduce.
In recording or during tone playing state, as mentioned above, reel gear 62, reel seat 66 with counter rotation to batch tape.Before arriving the magnetic tape terminal,, following reason is failure to actuate owing to making auto-stop mechanism 12.
Illustrate with reference to Figure 20 that mainly in recording or during tone playing state, rotating member 94 utilizes the contact friction between itself and the reel seat 66 and has to counterclockwise trend, thereby oscillating structural member 96 is pushed continuously to clockwise direction.The sliding contacting part 113 that makes agitation member 96 then and the offset cam 118(of cam plectane are with reference to Figure 14) sliding contact.As shown in figure 14, as long as oscillating structural member 96 has to clockwise trend, offset cam 118 just can not left in joint portion 113.At this moment, as shown in figure 12, the joint portion 112 of cam plectane is positioned at that to leave rotation center be the position that is slightly less than the minimum addendum modification of offset cam 118, has the gap that can allow sliding contacting part 113 be able to pass through between maximum displacement part and joint portion 122.Therefore, sliding contacting part 113 can not contact joint portion 122.As long as sliding contacting part 113 does not contact joint portion 122, gear plate 126 just can not rotate, and the push-pads 130 of gear plate can not push the right-hand member Extendible flake 132 of preventing member yet.Therefore, prevent member 26 to rest on this preventions position, the switch 38 of motor still maintains on-state, reel seat 66 before the arrival magnetic tape terminal unceasingly with counter rotation.In addition, under this situation, oscillating structural member 96 is to continue swing with the corresponding amplitude of the offset of offset cam 118.Yet in recording or tone playing state, when arriving the magnetic tape terminal, because tape is tightened up, the rotation of reel seat 66 stops, so the reel seat no longer makes rotation detection means 94 be subjected to acting force, rotation detection means 94 no longer pushes oscillating structural member 96.Therefore, the sliding contacting part 113 of oscillating structural member with the minimum displacement part sliding contact of offset cam 116 after, just rest on the position that deviates from offset cam.The sliding contacting part 113 that stopped of mode according to this, contacts with prevention portion 122 when rotating half-turn approximately at cam plectane 114.At this moment, prevention portion 122 is positioned on the oscillation centre (axle 98) of oscillating structural member and the straight line that sliding contacting part 113 connects to, this straight line and joint portion 122, the angle α between the straight line that the contact position of sliding contacting part 113 and capstan 52 are linked is approximately 90 degree (with reference to Fig. 4).Therefore, even oscillating structural member 96 also can not swung during cam plectane 114 rotation, and gear plate 126 aspects, be subjected to swinging to clockwise direction from the opposite force of sliding contacting part 113, make gear 116 leave reel gear 62, just interdicted towards the driving approach of reel gear 62.Simultaneously, the pushing portion 130 of gear plate will prevent the Extendible flake 132 of member 26 to right-hand pushing, make to prevent member to move to right-hand.Remove recording in this way, the control member 16,17 that playback is used makes it reset into primary position.In addition, because the recovery of these control members prevents member 26 also to restore to left, motor switch 38 is disconnected, and finishes so self-braking action is promptly accused.
Therefore, auto-stop mechanism 12 of the present invention is under recording or tone playing state, because the rotation of reel seat 66 makes and rotates detection means 94 and be subjected between the action period of power, be failure to actuate, when arriving the magnetic tape terminal, the rotation of reel seat stops, above-mentioned acting force one disappears, just action immediately.
Below stopping automatically when unrolling state will be described.Unroll when the control member 18 when being pressed into, FF/REW conversion rod 74 is to the swing of counter-rotating pin direction, and gear 76 carries out tape to the clockwise direction rotation and unrolls with reel gear 78 engagements, reel seat 80.When unrolling state, because headplate 46 is positioned at non-operating position, the gear 116 of cam plectane does not mesh with reel gear 62.In addition, utilize the tension force of tape to rotate because batch the reel seat 66 of side to clockwise direction, so rotation detection means 94 also has towards equidirectional trend, push the left hand edge 100a of oscillating structural member 96 with pin 95a, to keep the sliding contact state of 113 pairs of offset cams 118 of sliding contacting part.Therefore, as long as reel seat 80,66 is rotating, auto-stop mechanism 12 just is failure to actuate.But when the tape incoming terminal, because the rotation of reel seat 80,66 stops, so the acting force of rotation detection means 94 disappears, as mentioned above, auto-stop mechanism 12 just produces action.
In addition, when the express delivery state was pressed into control member 19, FF/REW conversion rod 74 was to the clockwise direction swing, and gear 76 meshes with idle pulley 69.Then, reel seat 66 batches tape with the counter-clockwise direction high speed rotating.In this express delivery state, because headplate 46 is positioned at non-operating position, the gear 116 of cam plectane does not mesh with reel gear 62.And, detection means 94 continues to have to clockwise trend because reel seat 66 makes rotation, so auto-stop mechanism is failure to actuate, when the tape incoming terminal, the rotation of reel seat 66 stops, rotation detection means 94 no longer is subjected to the effect of the acting force of reel 66, as mentioned above, and just action of auto-stop mechanism 12.
As mentioned above, auto-stop mechanism 12 of the present invention is in 66 rotations of reel seat, when being produced acting force, rotation detection means 94 is failure to actuate, when tape is reached home, the rotation of reel seat stops, no matter these auto-stop mechanism 12 actions when the suffered acting force of rotation detection means disappears so be tone playing state, recording state or at the state of unrolling, fast state, all action promptly becomes and so-calledly automatically stops in a manner described.
In addition, in the cassette recorder 10 of present embodiment, also can adopt above-mentioned various novel structures in addition.For example traditional structure be motor by absorption of vibrations with rubber ring to be bolted on the motor bracket, this support then is fixed on the base plate.In contrast, in the present embodiment, just motor 36 is contained on the motor bracket 150 without the structure cushion rubber.In addition, only just motor bracket is contained on the base plate with 1 bolt.
That is extremely shown in Figure 23 as Figure 21, motor bracket 150 is made of plastic, 2 groups of part ring segments 152,153 is arranged alternately at a distance of 90 degree formation ring-types at its assembling board.Part ring segment 152,153 is shown in Figure 22 (a), because of forming the structure of single-beam, so obtain to fill the elastic deformation of part.And, at the free end of easy elastic deformation, be formed with bolt cylindraceous insertion section 152a or partly spherical jut 153a respectively.In addition, the height of bolt insertion section 152a and jut 153a is different, shown in Figure 22 (b), makes jut 153a than bolt insertion section 152a height.Motor 36 is loaded in the assembling board of the motor bracket 150 of this kind mode, shown in Figure 22 (b),, utilizes this bolt to assemble motor bolt 154 inserting bolt insertion section 152a.Thus, partly spherical jut 153a just sinks to bolt insertion section 152a has identical height, and motor 36 utilizes 4 places altogether of bolt insertion section 152a and jut 153a flexibly being supported.Therefore, the elastic deformation of the available ring segment 152,153 of the vibration of motor fully absorbs.So can prevent from the internal vibration of motor is sent to base plate 14.In addition, as when carrying waits, do the time spent even the external vibration of impact produces whole device, the amplitude of motor 36 is limited in the scope of gap a, b shown in Figure 22 (b).Therefore do not have Yin Mada 36 and vibrate situation excessive and that generation damages ring segment 152,153.
In above-mentioned structure, can not use anti-shaking to use rubber ring when being assemblied in motor 36 on the motor bracket 150, and motor bracket utilize 1 bolt just can pack on the base plate 14.Therefore, part count can reduce, and assembly process can make things convenient for soon simultaneously, and robotization is also as easy as rolling off a log.
In addition, eraser 48 is assemblied on the eraser bar 166 with one touch type, and eraser bar itself also is assemblied on the substrate 34 with one touch type simultaneously, makes up eraser 48 by this way.That is shown in Figure 25 as Figure 24, eraser bar 166 is a plastic part, has pair of hook pieces 168 to extend upward thereon.This interval to hook sheet 168 is configured to and can matches with the width of eraser 48.This structure is: from the top with eraser 48 when making the outside elastic deformation of this hook sheet 168, be pressed into this between the hook sheet 168, utilize the elastic recovery of hook sheet to keep this eraser 48 securely.Therefore, do not use bolt eraser 48 can be contained on the eraser bar 166 rapidly and easily, so be easy to robotization yet.
In addition, eraser bar 166, possessing in the lower end of the set cylindrical portion 169 of one end has bead sheet 170.When it being combined on the substrate 34, cylindrical portion 169 is entrenched on the axle 171 on the substrate 34, make then under the situation of the outside elastic deformation of hook sheet 171a on the substrate to descend.So make hook sheet 171a elastic recovery to prevent bead sheet 170 in the time of on it arrives substrate, finish so assembly work is promptly accused.In addition, bead sheet 170 partly is formed on the lower end of cylindrical portion 169 in this embodiment, but also can not be partly and be arranged on whole circumference, also can not be located at the lower end and is located at the middle part.Like this, the bead sheet 170 of eraser bar is prevented by the hook sheet 171a on substrate, formation can prevent to throw off, and does not need to use any bolt etc., can be combined on the substrate 34 with one touch type, and its robotization is also easy.
In addition, in cassette recorder, after tape cassete being inserted tape cassete retainer (not shown), the tape cassete retainer is rotated, the reel core in the tape cassete is installed on the reel seat with tape cassete retainer.Then, the tape cassete retainer is prevented on the locking component that is called the E sliding bar, this E sliding bar can be assemblied on the substrate usually slidably.And, the E sliding bar is slided by stopping to finish ejecting with being pressed into of control member, and remove prevention to the tape cassete retainer, by the rotation of tape cassete retainer, can take out or replace tape cassete again.
In the structure of generally knowing, the E sliding bar is that the bolt of the guide that slides with double as is assemblied on the substrate.In contrast, E sliding bar does not in the present embodiment use bolt, can be assemblied on the base plate with one touch type.
That is in the present embodiment, to shown in Figure 28, E sliding bar 172 is plastic products as Figure 26, possesses flexible 174 and 4 and prevents sheet 176.Prevent sheets 176 for 4, as shown in figure 26, up and down, left and right symmetrically respectively is provided with 2, from the right bent portions of the clamping base plate 14 that gets off.In addition, flexure strip 174 has jut 174a(with reference to Figure 29 at its front end).On the other hand, the right bent portions of base plate 14 as Figure 30, shown in Figure 31, has and allows the opening 14d that prevents notch 14c that sheet 176 inserts and the jut 174 that allows flexure strip insert.
Therefore, in the time of being assembled to E sliding bar 172 on the base plate 14, at first as shown in figure 26, prevent sheets 176 to be entrenched in the notch 14c of base plate with 4 after, it is right-hand that it is slided to, the right bent portions of utilizing prevention sheet 176 up and down to come clamping base plate 14.At this moment the jut 174a of flexure strip falls in the opening 14d on chassis, and the actuating range of E sliding bar 172 is limited, and promptly finishes the assembling on base plate 14.So, the assembling of E sliding bar 172 need not used bolt etc. yet, can carry out with one touch type.
In addition, in the present embodiment, the junction surface of the usefulness of interosculating is located at recording respectively with on control member 16 and the playback operation member 17, and its constituted mode is when recording is pressed into control member, and playback also is pressed into control member thereupon.In addition, utilize playback recording also to be restored with control member with the retracting spring of control member 17.But, when control member 16 is in non-operating position (primary position), because between two joint portions, there is the gap of advance and retreat direction to have, if the recording of therefore letting matters aside just has problem unstable and vibration with control member 16.Therefore, in the present embodiment,, on substrate 34, be provided with flexure strip 180, be provided with the bend 180a that extends of inclination at the front end position of this flexure strip downwards as Figure 32, shown in Figure 33.In addition, this bend 180a extends in the opening 16a of control member 16, when control member 16 is positioned at non-operating position, and the edge contact of bend 180a and this opening 16a, the acting force that allows control member 16 have the direction of arrow, the moving freely of quiescing member 16.Therefore, can prevent that control member 16 from vibrating when non-operating position.
The present invention is not limited to present embodiment again, also can be widely used in video tape recorder and other drives.As mentioned above, as long as the action of the auto-stop mechanism relevant with the present invention is when the rotation of reel seat, on the rotation detection means, there is acting force, the sense of rotation of reel seat any one direction about being no matter, auto-stop mechanism also is failure to actuate, and when the rotation that arrives magnetic tape terminal reel seat stopped, the acting force on the rotation detection means disappeared then that auto-stop mechanism just produces action.Therefore, not only in tone playing state, recording state, and at the state of unrolling, also all be to produce action in the magnetic tape terminal during express delivery state, promptly what is called can automatically stop.In addition, make the tape walking unstable in the time of also can not resembling the structure of utilizing tension arm over.In addition, pinch roller also needn't be too strong to the crimping strength of capstan, so the design of the bearing portion of capstan has also made things convenient for.
In the accompanying drawings:
Fig. 1, Fig. 2 are the general view and the summary ground plans of cassette recorder,
Fig. 3, Fig. 4 are expression shut-down mechanism and the planimetric map of preventing relationships between components,
Fig. 5 to Fig. 7 is the planimetric map, front view (FV) of FF/REW conversion rod and along the sectional view of VII-VII line of Fig. 6.
Fig. 8, Fig. 9 are the planimetric map and the front view (FV)s of rotation detection means,
Figure 10, Figure 11 are the planimetric map and the front view (FV)s of oscillating structural member,
Figure 12, Figure 13 are the planimetric map and the skiagraphs of cam plectane,
Figure 14 is the planimetric map of gear plate,
Figure 15 is the planimetric map of headplate,
Figure 16 to Figure 19 is the front view (FV) of pinch roller bar, planimetric map, and outboard profile and oblique view,
Figure 20 is the planimetric map that concerns between expression shut-down mechanism and the prevention member,
Figure 21, Figure 22 (a) and (b), Figure 23 be the front view (FV), ground plan of motor bracket, along the amplification profile and the left surface figure of the B-B line of Figure 22 (a),
Figure 24, Figure 25 are the front view (FV) and the planimetric maps of eraser bar,
Figure 26 to Figure 29 is that front view (FV), planimetric map, the left surface figure of E sliding bar reaches along the amplification profile of the line A-A of Figure 26,
Figure 30, Figure 31 are the front view (FV) and the planimetric maps of base plate right bent portions,
Figure 32 is the sectional view along the base plate of the B-B line of Fig. 1,
Figure 33 is the part planimetric map of substrate.
Employed main symbol and expression thereof partly are in the accompanying drawing:
16～21 ... control member, 26 ... prevent member, 36 ... motor, 62,78 ... reel gear (reel platform), 66,80 ... the reel seat, 94 ... the rotation detection means, 96 ... oscillating structural member, 113 ... sliding contacting part, 114 ... the cam plectane, 118 ... offset cam, 122 ... the joint portion, 126 ... gear plate (releasing member), 130 ... pushing portion.
Claims (1)
1, a kind of auto-stop mechanism of drive is characterized in that possessing and has:
Prevent member,,, and prevent this control member to make it stop at operating position with this control member interlock when making drive be in control member that operating state uses when operating position moves;
The rotation detection means, be assembled in any one direction rotation to the left and right on the reel seat, and utilize the contact friction between itself and the reel seat and have towards the trend of the sense of rotation of reel seat, this reel seat is assembled into rotatable reel platform coaxial, and utilizes the contact friction of this reel seat and reel platform and rotate with the reel platform;
The oscillating structural member that can swing possesses sliding contacting part is arranged, and when any one direction rotation to the left and right of reel seat, all is subjected to the revolving force effect of above-mentioned rotation detection means and has trend towards a side;
The cam plectane has the ring-type offset cam and is used for combining with the sliding contacting part of oscillating structural member and having binding site in the position that deviates from offset cam, and this cam plectane is configured to drive source drives power to be sent to the reel platform;
The releasing member that can shake possesses the pushing portion that can be used to push the prevention member is arranged, and the cam plectane is freely being supported in revolution;
Acting force one disappearance that stops to make the rotation detection means owing to the reel seat, then the sliding contacting part of oscillating structural member rests on the position of the offset cam that deviates from the cam plectane, contact with the joint portion of cam plectane, the cam plectane is owing to the opposite force that is subjected to from sliding contacting part makes the swing of releasing member, the driving approach from the cam plectane to the reel platform is interdicted in the swing of utilization releasing member, remove the pushing portion pushing of member simultaneously and prevent member that the prevention member is moved, to remove the prevention of control member.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61313107A JPH0656680B2 (en) | 1986-12-31 | 1986-12-31 | Autostop mechanism for tape drive |
| JP313107/86 | 1986-12-31 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN87103591A true CN87103591A (en) | 1988-07-13 |
| CN1011743B CN1011743B (en) | 1991-02-20 |
Family
ID=18037234
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87208090 Expired - Lifetime CN2030363U (en) | 1986-12-31 | 1987-05-14 | Automatic stopping device for tap driving mechanism |
| CN 87103591 Expired CN1011743B (en) | 1986-12-31 | 1987-05-14 | Automatic stopping means of tape drive apparatus |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87208090 Expired - Lifetime CN2030363U (en) | 1986-12-31 | 1987-05-14 | Automatic stopping device for tap driving mechanism |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH0656680B2 (en) |
| CN (2) | CN2030363U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000030089A1 (en) * | 1998-11-13 | 2000-05-25 | Lee, Chingyun | All-automatic stopping mechanism for a recorder |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2506565Y2 (en) * | 1987-03-25 | 1996-08-14 | ソニー株式会社 | State detection mechanism |
| JPH076452A (en) * | 1994-02-09 | 1995-01-10 | Tanashin Denki Co | Mode switching device for tape recorder |
-
1986
- 1986-12-31 JP JP61313107A patent/JPH0656680B2/en not_active Expired - Lifetime
-
1987
- 1987-05-14 CN CN 87208090 patent/CN2030363U/en not_active Expired - Lifetime
- 1987-05-14 CN CN 87103591 patent/CN1011743B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000030089A1 (en) * | 1998-11-13 | 2000-05-25 | Lee, Chingyun | All-automatic stopping mechanism for a recorder |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0656680B2 (en) | 1994-07-27 |
| CN2030363U (en) | 1989-01-04 |
| JPS63168863A (en) | 1988-07-12 |
| CN1011743B (en) | 1991-02-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C13 | Decision | ||
| C14 | Grant of patent or utility model | ||
| C35 | Partial or whole invalidation of patent or utility model |