CN1094181A

CN1094181A - rotating driving device

Info

Publication number: CN1094181A
Application number: CN93108473A
Authority: CN
Inventors: 城户国男
Original assignee: Tanashin Denki Co Ltd
Current assignee: Tanashin Denki Co Ltd
Priority date: 1993-03-24
Filing date: 1993-07-28
Publication date: 1994-10-26
Also published as: JPH06274971A; KR940022470A

Abstract

A kind of rotating driving device even this device can prevent also that when the turning axle run-off the straight eccentric wear of turning axle from decreasing and the revolving property change, thereby can not need strict dimensional accuracy and assembly precision.This device is provided with following each parts: the frame that has bearing portions and made by synthetic resin; In this bearing portions, can rotate freely and can transmit power that motor brings turning axle so as to driven in rotation; Be contained in and this turning axle left in the axial direction make on the position of above-mentioned bearing portions its support unit in can being supported in with rotating freely; The flexible part and above-mentioned frame formation one that can make above-mentioned bearing portions make elastic deformation and support.

Description

Rotating driving device

The present invention relates to the rotating driving device that blattnerphone and so on is included, playback set is used, in particular concerning with capstan, flywheel is the supporting structure of the turning axle of representative.

Be provided with the rotating driving device that tape is walked about in the inside of tape recording machine enclosure.The capstan that this rotating driving device has pinch roller, walk about with this pinch roller clamping tape and send motor power the kinematic train of this capstan to, these functional parts all are assembled on the same frame.Capstan can be supported in the bearing portions of frame with rotating freely at that time, and pinch roller can with this capstan a side is stretched above frame part crimping or disengaging.

With regard to this rotating driving device, in order to prevent capstan to rack inclining, the total length of above-mentioned bearing portions preferably can be done to such an extent that grow a bit.But follow the slimming of magnetic tape station recently, require rotating driving device also will do as thin as a wafer, constitute compactly.Because this cause, the gauge of frame also is restricted certainly greatly, above-mentioned like that the bearing portions total length is done long any way, be not the thing that when making every effort to all slimmings of device, does with naturally.

Therefore way always is, below above-mentioned frame, leaving the support plate that capstan is rotated freely and be supported is being installed on the position of bearing portions, this capstan is supported by two places of separating in the axial direction, the total length of above-mentioned bearing portions is shortened with this.When constituting like this, the part of utilizing the bearing portions total length to shorten can be installed flywheel etc. between this bearing portions and support plate, and this is very suitable to making every effort to all slimmings of device.

But when constituting like this, because capstan is to cross between frame and two parts of support unit, if assembly precision etc. do not catch up with, just in the situation that can produce lower shaft hole center line misalignment between bearing portions and the support unit, this is to be worth worrying.

So even capstan is still by 2 supportings, this capstan still can run-off the straight.After the such run-off the straight of this capstan, the inner face of bearing portions just can not contact equably with the periphery of capstan, and this capstan will produce eccentric wear and decrease, and the rotation of capstan will change, and revolving property changes, and this also is to be worth worrying.

For this reason, when capstan adopted 2 supportings, to the strict dimensional accuracy and the assembly precision of two bearing portions of supporting capstan, the size management had just bothered like this, also causes manufacturing cost and rises, and this is inappropriate.

Purpose of the present invention will provide a kind of like this rotating driving device exactly, this device when turning axle be during by two places supporting of separating in the axial direction, though also run-off the straight of this turning axle, but the eccentric wear of turning axle decreases and the rotation change can prevent, and can not need strict dimensional accuracy and assembly precision.

In addition, another object of the present invention is for making a kind of like this rotating driving device, even the turning axle run-off the straight of this device still can make the roller crimping equably in this turning axle periphery, makes the tape can be not crooked and can stably walk about.

Rotating driving device of the present invention is characterised in that: be provided with following parts: have bearing portions and the frame made by synthetic resin; Can in the bearing portions of this frame, rotate freely and be supported and transmit the turning axle of the power of drive source so as to driven in rotation; The roller of can be with the periphery crimping or the disengaging of turning axle, can follow with this turning axle crimping the time that turning axle rotates with it and can walk about with turning axle clamping tape; Be installed on the above-mentioned frame, make above-mentioned turning axle on leaving the position of above-mentioned bearing portions, make its support unit in can being supported in the axial direction with rotating freely.The block bearing that is provided with together on above-mentioned frame and becomes one partly makes it can make the flexible part of elasticity displacement; Had on the above-mentioned rollers be crimped on the turning axle, switching part cylindraceous, and be located at this switching part inboard and can rotate with it, and supporting the axle supporting part that bolster with above-mentioned rotating shaft parallel can rotate freely it; This supporting part is made of the material of energy elastic deformation; Supporting above-mentioned switching partly makes it can make the elastic deformation part and this supporting part formation one of elasticity displacement.

Even the turning axle run-off the straight, because the flexural deformation of flexible part makes bearing portions can follow turning axle, so turning axle is easily with the running-in of bearing part.

But when the turning axle crimping of roller and inclination, because the switching of this roller is partly just local and the turning axle crimping, being applied to switching part divides the pressure on the outer peripheral face in the axial direction just can not be impartial, so that pressure acts on position on the roller partially a side, at this moment owing to exist the elastic deformation part between the switching of roller part and the bolster, the active position that this elastic deformation part can adapt to pressure is done flexible deflection deformation, because this deflection, making the switching part also can follow the inclination of turning axle and tilt.

Therefore can make between turning axle and the roller crimp force roller axially on equalization, and be clamped in when walking about between turning axle and the roller when tape, can prevent from inappropriate power is applied on this tape.

Below with figure explanation embodiments of the invention, wherein:

Fig. 1 is in the 1st embodiment of the present invention, and the sectional view that its capstan is in heeling condition is shown,

Fig. 2 be among Fig. 3 along the sectional view of A-A line,

Fig. 3 illustrates the sectional view of the state that supports with frame when capstan tilts,

Fig. 4 is the sectional view that the capstan assembling structure is shown,

Fig. 5 is the planimetric map of rotating driving device integral body,

Fig. 6 is the back view of rotating driving device integral body,

The outboard profile of Fig. 7 for from Fig. 5, looking from the B direction,

Fig. 8 is the sectional view that the present invention the 2nd embodiment is shown,

Fig. 9 is in the 3rd embodiment of the present invention, and the sectional view that its capstan and pinch roller are in heeling condition is shown,

Figure 10 is the sectional view that the relation of the capstan of inclination and pinch roller is shown,

Figure 11 be along among Figure 10 along the sectional view of C-C line.

Describe with regard to the 1st embodiment of the present invention that the portable recorder rotating driving device is suitable for according to Fig. 1 to Fig. 7 below.

In Fig. 5 to Fig. 7, the frame of label 1 expression is to be shaped with the synthetic resin material monolithic to form, and this frame 1 is to be little rectangle than tape cassete 2, this above frame 1 side adorning tape cassete 2.

Magnetic head supporting plate 4 can be on fore-and-aft direction be supported in frame 1 slidably.Playback is installed on the magnetic head supporting plate 4 with magnetic head 5.To press with the integrally formed playback bar 6 of magnetic head supporting plate 4 with finger tip, magnetic head 5 just advances with magnetic head supporting plate 4, contacts with tape 7 in the tape cassete 2.

Batch tape reel seat 9 and supply with tape reel seat 10 can be installed in with rotating freely frame 1 above.As Figure 6 and Figure 7, the turning axle 11 that batches tape reel seat 9 passes frame 1 side below frame and draws, and is fixing take-up pulley 12 on the exit of turning axle 11, and this take-up pulley 12 is provided with small diameter portion and major diameter part.

In addition with frame 1 on batch tape reel seat 9 adjacency the bight become the installation portion 1a of motor.Motor mounting part 1a goes one section than frame 1 other parts are low as shown in Figure 7, holds with screw as the motor of drive source on this installation portion 1a.

The driving shaft 14 of motor 13 passes motor mounting part 1a side below it and stretches out.On the external part of this driving shaft 14, fixing drive pulley 15.Other in drive pulley 15, there is the major diameter part 12b of take-up pulley 12 to also have small diameter portion 12a, volume is hung the 1st rotating band 16 between drive pulley 15 and major diameter part 12b, so that on take-up pulley 12, the rotation of driving shaft 14 is to send with the state after slowing down.

As shown in Figure 1 and Figure 4, on frame 1, disposing as the capstan 21 and the pinch roller 20 of turning axle with adjoining each other.This pinch roller 20 and capstan 21 are arranged on the place ahead on the direction of walking about of magnetic head 5 opposite tapes 7.Pinch roller 20 has the axle supporting part of being made by synthetic resin 22, and can be fixed on the cylindric rubber roll 23 of this position rotatably with the periphery of this supporting part 22.The outer peripheral face of this rubber roll becomes the curved surface of making arc-shaped bend in the outside radially.Therefore the diameter of two ends of the pinch roller 20 of present embodiment on it is axial is less, and begins progressively to increase to the center section diameter vertically from the end, roughly becomes the fat type.

But pinch roller 20 free rotary ground supportings are on roller arm 25.Roller arm 25 have a pair of can be from the arm 25a of clamping pinch roller up and down, 25b.At this two arm 25a, insert bolster 26 between the 25b, the bearing portions 22 of pinch roller 20 can support thereon rotatably from axle.This roller arm 25 is because the effect of pivot 27, can rotate freely be that point supporting is on frame 1 with pivot 27.This pivot 27 and bolster 26 all with the direction of frame 1 orthogonal on extend.Therefore pinch roller 20 always can pivot 27 rotates for fulcrum between the two positions, and a position is tape 7 to be clamped in the position that it is sent to capstan 21 together, and a position is the position of readiness that leaves capstan 21 in addition.Like this, when playback bar 6 was pressed, pinch roller 20 and roller arm 25 just can be pressed action with this and move, and rotated towards capstan 21.

At that time, on above-mentioned capstan 21, as shown in Figure 4, fixing flywheel 28.This flywheel 28 is sheave segments 29 of being made by synthetic resin, and overlays that weight plectane 30 that the metal on this sheave segment makes constitutes.At that time, in the center pit of this weight plectane 30, be pressed into the outstanding wheel hub of setting up 31 on pulley 29 rotation centers part, this sheave segment 29 is become one with weight plectane 30.Also being pressed into capstan 21 at that time on this wheel hub 31 makes and can rotate together.An end of this capstan 21 is outstanding below wheel hub 31.

But like this capstan 21 just free rotary ground supporting on frame 1.Now the structure with regard to this supporting is illustrated, and as shown in figures 1 and 3, the bearing portions of the thick increase of meat is integrally formed on the frame 1.Bearing portions 33 respectively above frame and below outwards outstanding.This bearing portions 33 and dead eye 33a also are integrally formed.In this dead eye 33a, chimeric have a capstan 21, can rotate freely in the axle sense of rotation.

Capstan 21 also is entrenched in the dead eye 43 of frame 1 a following side in addition.

Capstan 21 is drawn in part side above frame 1 of flywheel 28 opposition sides.The extension of this capstan 21 becomes the tape retained part 34 that pinch roller 20 might engage and break away from the ground crimping.When above-mentioned playback bar was depressed, the rubber roll 23 of pinch roller 20 can contact with this tape retained part 34 with rotating freely.Because this contact just can be clamped in tape 7 between tape retained part 34 and the rubber roll 23, and tape 7 is walked about.

In addition, between the small diameter portion 12a of the sheave segment 29 of flywheel 28 and take-up pulley 12 also volume hang the 2nd rotating band 35.Sheave segment 29 partly is connected with small diameter portion 12a rather than with major diameter, because the difference on this diameter, the rotation of above-mentioned driving shaft 14 always just is sent on the capstan 21 through behind the double reduction.

As shown in Figure 1 and Figure 4, the support unit 37 that 21 1 end free rotary ground supportings of capstan is installed below frame 1.Support unit 37 is an elongated plate object, is provided with a pair of fixed part 38a, 38b at its two ends.Fixed part 38a, 38b are stacked in the frame 1 following outstanding pair of screws seat 39a that sets up, and on the 39b, fix with screw 40 screw-ins respectively.

Middle body at the length direction of support unit 37 is provided with bearing protuberance 42.The meat thickness rate support unit 37 of bearing protuberance 42 comes thickly, forms through hole 43 on this bearing protuberance.Like this, capstan 21 end just can be in rotational axis direction be entrenched in this through hole 43 rotationally.Because this is chimeric, capstan 21 vertically two places of separating on frame 1 are supported.This capstan 21, the same with the bolster 26 of above-mentioned pinch roller 20, be upwardly extending with the side of frame 1 orthogonal.

In addition, the top of bearing protuberance 42 can contact with 28 the following of wheel hub 31 of flywheel by sliding, and can determine capstan 21 position in the axial direction thus.

Be accompanied by capstan 21 and supported by two places of separating on axially on the frame, outside the barrel that also has around the above-mentioned bearing portions and frame 1 forms one is enclosed in coaxial shape.Between the interior week of this barrel 45 and the periphery of bearing portions 33, on the centre position axial, be provided with flexible part 46 and become one so that link along it.As shown in Figure 2, flexible part 46 be between bearing portions 33 and barrel 45, be provided with radial four bridge portions 47 that link up.The meat thickness rate bearing portions 33 and the barrel 45 of bridge portion 47 are all come thinly, add it itself is to be made into integration with synthetic resin and frame 1, and both combine just becomes easy deflection.Therefore, flexible part 46 is frame 1 can being made the mode block bearing part 33 of elasticity displacement, and bearing portions 33 always can freely tilt with any direction in deciding scope in barrel 45 inboards.

The rotating driving device of Gou Chenging like this on frame 1 during assembling capstan 21, at first must be pressed into capstan 21 in advance in the flywheel 28 and makes it integrated.Under this state, capstan 21 is entrenched in the embedded hole 33a of the bearing portions 33 of a side below the frame 1, the tape retained part 34 that makes capstan 21 from bearing portions 33 be drawn out to frame 1 above a side.

The end portion of capstan 21 is embedded in the through hole 43 of support unit 37.With the fixed part 38a at support unit 37 two ends, the superimposed screw base 39a in frame 1 of 38b on the 39b, is screwed into screw 40 thereon and is fixed then.Because this is fixed, two places that capstan 21 is separated on must thinking axially on the frame 1 are supported.

; when capstan 21 is supported on the machine 1; because an end of capstan 21 is supported by the support unit 37 that does not belong to one with frame 1; so that the through hole 43 of this support unit is subjected to both assembly errors and the influence of dimensional accuracy with the coaxial state position of the dead eye 33a of bearing portions 33, and deviation takes place the gap between through hole 43 and capstan 21 and dead eye 33a and capstan 21.So as shown in Figure 1, because the cause that 21 pairs of frames of capstan 1 tilt, the axis X 1 of this capstan 21 disappears with the depth of parallelism of the axis X 2 of

pinch roller

20,21 pairs of pinch rollers 20 of capstan can only be inclined to the θ angle.In addition, in order clearly to show the heeling condition of capstan 21, this tiltangle is shown large in Fig. 1, and actual pitch angle is very little, and maximum has only 1 °.

When such inclination takes place in capstan 21, between capstan 21 and dead eye 33a, though, allow capstan 21 rotations owing to exist the gap, but the periphery of capstan 21 can not contact equably on the inner face of dead eye 33a, the consequently phenomenon of the incomplete contact of generation.

Yet, the formation of saying above adopting, bearing portions 33 is owing to used resilient flexible part 46 to be connected with the barrel 45 of frame 1, and this bearing portions 33 just can be to barrel 45 displacements under situation about being supported.When capstan 21 as described above during run-off the straight, flexible part 46 will deflection deformation, because this distortion, bearing portions 33 just can be followed the inclination of capstan and be tilted.

As a result, capstan 21 can successfully be drawn close to bearing portions 33, and it is impartial that the contact pressure of the capstan 21 relative with dead eye 33a inner face will be tending towards vertically, and like this, the incomplete contact of capstan 21 just can be eliminated.

Thereby, after the formation that adopts above-mentioned the 1st embodiment, because bearing portions 33 can be followed the dip plane displacement of capstan 21, strict dimensional accuracy and assembly precision just there is no need, the eccentric wear of capstan 21 decreases and the revolving property change can not prevented when taking place, so manufacturing cost also just can reduce.

With regard to the 1st embodiment, the pinch roller 20 that contacts with capstan 21 is made into the beer barrel shape, because the outer peripheral face of pinch roller 20 is made into circular-arc curved shape, even when capstan 21 run-off the straights, the subtend area of this capstan 21 and pinch roller 20, promptly the area with tape 7 still can roughly keep certain.

Therefore, tape 7 is clamped in when between pinch roller 20 and the capstan 21 tape being walked about, can prevents from inappropriate power is applied on the tape 7, tape skew etc. just can not take place yet, and this tape 7 can stably be walked about.

In addition, in above-mentioned the 1st embodiment, settings that become one of bearing portions 33 and frame 1, but the present invention is to this point and unrestrictedly.The 2nd embodiment of the present invention as shown in Figure 8, integrally formed with the flexible part 46 inboard cylindrical bearing supporting parts 51 that are connected with frame 1, divide 51 inboard at this bearing support, with means such as be pressed into metal bearing 52 is pressed into, way also is good like this.

In addition, Fig. 9 illustrates the 3rd embodiment of the present invention to Figure 11.

The 3rd embodiment mainly is that the structure and above-mentioned the 1st embodiment of pinch roller 61 is different, and other formations are all identical with the 1st embodiment.

As shown in Figure 10 and Figure 11, pinch roller 61 has with capstan 21 clamping tapes 7, as the rubber roll 62 of switching part, and the axle supporting part made from synthetic resin 63 that is pressed in the inboard of this rubber roll.This supporting part 63 has the inner cylindrical portion 64 that can at bolster 26 periphery free rotary ground supportings again, and with the periphery of this inner cylindrical portion 64 become coaxial shape configuration, can with the urceolus part 65 of above-mentioned rubber roll 62 rotations, the elastic deformation part 66 that this urceolus part 65 and inner cylindrical portion 64 are linked up in addition, this three part is made one.

Elasticity sex change part 66 is radially with four bridge portions 67 between the inner peripheral surface of the outer peripheral face of inner cylindrical portion 64 and urceolus part 65 and links as shown in figure 11.67 in bridge portion is in inner cylindrical portion 64 and urceolus part 65 middle part vertically, its meat is thick all to be come thinly than inner cylindrical portion 64 and urceolus part 65, this point and itself are with combining of making of synthetic resin it to be become to be easy to deflection, and therefore above-mentioned rubber roll 62 can carry out the elasticity displacement to bolster under situation about being supported.

The 3rd embodiment of Gou Chenging like this, when playback bar 6 is pressed, owing to rotate to direction near capstan 1 with this roller arm 25 of pressing the action interlock, the rubber roll 62 of pinch roller 61 is docked with capstan 21 by tape 7, because this butt joint, make pinch roller 61 follow capstan 21 and rotate, tape 7 is clamped between pinch roller 61 and the capstan 21 tape 7 is walked about.

Under this occasion, when capstan 21 tilts, because the depth of parallelism between this capstan 21 and pinch roller 61 disappears, so when pinch roller 61 is pressed on the tape retained part 34 of capstan 21, this rubber roll 62 always can not contact with tape retained part 34 on total length, at this moment just produces not exclusively contact.Therefore, the pressure that is applied on rubber roll 62 outer peripheral faces in the axial direction just can not be impartial, so that the position that pressure acts on the pinch roller 61 is offset.

But if adopt the axle supporting part 63 of the support rubber roller 62 that constitutes as described above, owing between this rubber roll 62 and bolster 26, disposing resilient elastic deformation part 66, when rubber roll 62 contacts with capstan 21 and the active position of the pressure of capstan 21 when skew takes place, as shown in Figure 9, the 66 meeting deflection deformations of elastic deformation part, because this deflection, rubber roll 62 just can be followed the inclination of capstan 21 and be tilted at bolster 26, so just can guarantee the depth of parallelism between rubber roll 62 and capstan 21.

So, owing to be applied to the cause of the pressure equalization vertically on the pinch roller 61, tape 7 is clamped in when between this pinch roller 61 and the capstan 21 tape 7 being walked about, just can prevent from inappropriate power is applied on the tape 7, therefore feelings such as crooked can not take place in tape 7, can stably walk about.

In addition, in the above-described embodiments, the two ends of support unit are fixed on the frame, and this is clipping more next well than what is called one end that this support unit has only an end to be fixed on the frame.

Moreover with regard to rotating driving device of the present invention, its turning axle is not specific to be the capstan of blattnerphone, and other analogs for example rotating cylinder of video tape recorder equally also can be used.

After adopting formation of the present invention, when the turning axle run-off the straight, because the deflection deformation of flexible part, make bearing portions follow turning axle, this turning axle is pressed close to bearing portions easily, makes the incomplete contact elimination of turning axle to bearing portions.Thereby strict dimensional accuracy and assembly precision just there is no need, and the eccentric wear of turning axle decreases and the revolving property change can not prevented when taking place, so manufacturing cost can reduce.

In addition, because the switching of roller part can be to the bolster displacement, when roller contacts with turning axle, follow the inclination of this turning axle, pressure acts on position on the switching part when skew takes place, because the deflection deformation of elastic deformation part, the switching part can be followed the inclination of turning axle and be tilted at bolster, it is hereby ensured the depth of parallelism between switching part and turning axle.Again owing to be applied to pressure equalization vertically in this switching partly, when tape is clamped in when walking about between roller and the turning axle, can prevent that inappropriate power is applied on the tape, make tape that crooked grade can not take place and can stably walk about.

Claims

1, the rotating driving device that a kind of blattnerphone and so on is included, playback set is used is characterized in that:

Be provided with following parts: have bearing portions (33) and the frame (1) made by synthetic resin, can in the bearing portions of this frame, rotate freely and be supported and transmit the turning axle (21) of the power of drive source so as to driven in rotation, can with the periphery crimping or the disengaging of this turning axle, with this turning axle crimping the time, can follow the roller (61) that turning axle rotates with it and can walk about with this turning axle clamping tape (7), be installed on the above-mentioned frame, make above-mentioned turning axle on leaving the position of above-mentioned bearing portions, make its support unit (37) in can being supported in the axial direction with rotating freely, make it can make the flexible part (46) of elastic deformation at above-mentioned frame upper support bearing portions, what had on the above-mentioned rollers is crimped on the turning axle, switching part cylindraceous (62), be located at the supporting part (63) that the inboard bolster (26) that can rotate with it and support with above-mentioned rotating shaft parallel of this switching part can rotate freely it, this supporting part is made of the material of energy elasticity displacement, supports above-mentioned switching part (62) and makes it can make the elastic deformation part (66) and this supporting part (63) formation one of elasticity displacement.