CN1253873C - Model changing apparatus for cassette tape playing machine - Google Patents

Abstract

Provided is a mode switching device for a cassette tape player capable of achieving low costs. A cam gear (3) is provided with an annular groove (10) on which the engaging projection (40) of a mode switching lever (30) is slid, operation mode stoppers (11, 12 and 13) to be engaged with the engaging projection (40) are disposed on the outer circumferential side of the annular groove (10), a reference stopper (14) used for setting a reference position on the inner circumferential side of the annular groove (10) is formed on a front side in the rotational direction of the cam gear (3) relative to the position of arranging an operation mode stopper (11) for setting a stop position in a stop mode, and the engaging projection (40) is engaged with the operation mode stopper (11) for setting a stop position after engagement with the reference stopper (14).

Description

The mode conversion device of cassette tape player

Technical field

The present invention relates to the mode conversion device of cassette tape player, be used for carrying out actions such as recording of information, broadcast and elimination and changing being housed in magnetic tape cassette in the box.

Background technology

The magnetic tape cassette that is housed in the box is carried out recording of information, and the cassette tape player of actions such as broadcast and elimination conversion is former to be a kind of technique known just.

In the past, simple and make all reasons such as cost reduction based on being used in mechanism that pattern sets, once to the mode conversion device of cassette tape player (below, in order simply to be referred to as mode conversion device) a kind of scheme proposed, in above-mentioned cassette tape player, can use the gear of strap cam, mode switch bar and solenoid are to stop mode, play mode, send to fast/head position of a plurality of patterns such as rollback pattern changes (position control), in detail, be to use (position control) changed in the position of head base, the position conversion of said head base is meant magnetic head is mounted to and can advances and retreat with respect to magnetic tape cassette, and make magnetic head formation above main frame, carry out linear reciprocating motion along main frame.

For example, the structure of such scheme is to dispose magnetic head cam and a plurality of pattern block along circumferencial direction on the gear of strap cam, the said head cam is used to make and magnetic head is mounted to the head base that magnetic head can be advanced and retreat point-blank with respect to magnetic tape cassette can carries out linear reciprocating motion, and above-mentioned a plurality of pattern blocks are used to set stop position and play position and send to fast/head position of exercises patterns such as rollback position.In addition, movement arm leading section at the mode switch bar with actuating arm and movement arm forms in conjunction with projection, make the actuating arm action of mode switch bar by solenoid, thus, make can be in selectively by the position on the motion track of the determined a plurality of pattern blocks of revolution of the gear of strap cam, and and the adjacent position of this motion track on the movement arm in conjunction with projection.And make being positioned on the motion track of a plurality of pattern blocks of mode switch bar in conjunction with projection by solenoidal driving, make in conjunction with projection to combine, can easily control the head position of desired pattern with in a plurality of pattern blocks any one.

Above-mentioned mode conversion device before this is according to the gear of strap cam and the binding site of mode switch bar, according to stop mode, play mode with send to fast/order of rollback pattern, in turn change.

But, thereby only have with binding site and judge the setting of the gear of strap cam mistakenly, promptly judge the problem of pattern mistakenly because in the mode conversion device before above-mentioned, the state of the mode switch bar when carrying out the exercises pattern is identical.In other words, the problem that can not stably determine pattern is arranged.Therefore, for example judge the stop position of gear of strap cam and the problem of play position sometimes with making a mistake.

In order to address the above problem, in the former mode conversion device, be provided with the play position detector switch of an action by moving of head base.

But,, thereby also require cassette tape player to reduce cost because the various devices of universal demand reduce cost in recent years.And requiring to reduce on the basis of sound-track engraving apparatus cost, require to reduce the cost of mode conversion device.

Therefore, require to have a kind of without the play position detector switch and the mode conversion device that can reduce cost.

Summary of the invention

The present invention makes for the problem that overcomes above-mentioned prior art existence, its objective is the mode conversion device that a kind of cassette tape player that can reduce cost is provided.

The mode conversion device of the cassette tape player of the present invention of making in order to achieve the above object, have gear, the mode switch bar that can combine that is used for strap cam that a plurality of patterns are changed and be used to make above-mentioned mode switch bar to carry out the solenoid of rotational action with the gear of above-mentioned strap cam, according to the binding site of the gear of above-mentioned strap cam and above-mentioned mode switch bar and the switching motion pattern, wherein, the gear of above-mentioned strap cam is provided with: the endless groove that slides in conjunction with projection of above-mentioned mode switch bar; Be provided in the outer circumferential side of this endless groove, on the exercises mode position can with the above-mentioned pattern block that combines the projection combination; Be provided in above-mentioned endless groove interior all sides, be used to set the benchmark block of reference position; The said reference block be formed in the above-mentioned exercises pattern block be used to set stop mode the time the front side of gyratory directions of gear equipping position, above-mentioned strap cam of pattern block of stop position, in case make above-mentioned in conjunction with projection with after the said reference block combines, just can make with the pattern block that is used to set above-mentioned stop position to combine.Like this, owing to adopted the mode conversion device of the cassette tape player of the present invention with said structure, when driving solenoid, what just make the mode switch bar is arranged in all sides of endless groove and any side of outer circumferential side selectively in conjunction with projection.And, under the state that makes all sides that are positioned at endless groove in conjunction with projection, make gear when revolution of strap cam, make the revolution that stops the gear of strap cam in conjunction with projection in combination, does not only combine with the benchmark block with the pattern block of the gear of strap cam.After this, when being driven round about, solenoid makes in conjunction with projection when interior all sides of endless groove are positioned at outer circumferential side, make the gear revolution of strap cam, the pattern block of setting stop position in conjunction with being used in the pattern block of projection and the gear of strap cam is combined, stop the revolution of the gear of strap cam thus.Thereby, because via necessarily making the revolution of the gear of strap cam stop at stop position after the reference position, thereby the play position detector switch that sets respectively before not being provided with, can reduce cost.

The mode conversion device of cassette tape player of the present invention, preferably be provided with force application spring, above-mentioned when separating with the benchmark block with above-mentioned exercises pattern block in conjunction with projection, this force application spring application of force so that the gear of above-mentioned strap cam turn round along gyratory directions.Like this, owing to adopt said structure, when the bonding state of removing in conjunction with projection and benchmark block, the gear of strap cam is turned round.

Description of drawings

Fig. 1 is that expression utilizes the cassette tape player of mode conversion device of cassette tape player of the present invention to be in the vertical view of primary structure of the main frame rear side of halted state.

Fig. 2 is that expression cassette tape player shown in Figure 1 is in figure in the broadcast state, identical with Fig. 1.

Fig. 3 is that expression cassette tape player shown in Figure 1 is in fast and sends to/figure in the rollback state, identical with Fig. 1.

Fig. 4 is that expression cassette tape player shown in Figure 1 is in figure in the hold mode of reference position, identical with Fig. 1.

Embodiment

Below, with reference to embodiment shown in the drawings the present invention is described.

Fig. 1 is that expression utilizes the cassette tape player of mode conversion device of the present invention to be in the primary structure vertical view of the main frame rear side of halted state.

As shown in Figure 1, the cassette tape player 1 of present embodiment has the main frame 2 that the plane roughly forms rectangle.Setting the gear 3 of strap cam at the central portion downside of this main frame 2, it is used for the conversion of a plurality of patterns.The gear 3 of this strap cam can supported freely to rotate by the gear fulcrum 4 that uprightly is arranged on the main frame 2.

Periphery at the gear 3 of above-mentioned strap cam forms tooth 5, output gear 6 engagements that this tooth 5 can set with gear 3 left sides at strap cam.This output gear 6 is setting with driving wheel (scheming not shown) with being integral, driving wheel turns round driving by the effect of the driving force of the unshowned motor of figure (driven motor), thus, make the clockwise direction shown in the arrow A of output gear 6 in Fig. 1 and turn round driving.And, also make revolution with output gear 6 and pass to gear 3 with the strap cam of output gear 6 engagements, the counter-clockwise direction shown in the arrow B of the gear 3 that makes strap cam in Fig. 1 and turn round driving.But, in the tooth portion 5 of the gear 3 of strap cam, damaged 5a, 5b, 5c, 5d are being set at 4 positions, damaged 5a, 5b, 5c, 5d and output gear 6 facing to state under, output gear 6 does not just pass to turning power the gear 3 of strap cam.

Surperficial outer circumferential side at the gear 3 of above-mentioned strap cam has formed endless groove 10, outer circumferential side at this endless groove 10 is disposing 3 pattern blocks 11,12,13, their plane roughly makes the square of growing crosswise, and is in center with the gear 3 of strap cam and is on the concentric circles in the center of circle to dispose along circumferencial direction.In these 3 pattern blocks 11,12,13, the pattern block 11 that illustrates above Fig. 1 is used for being set in the stop position of gear 3 of the strap cam of stop mode; The pattern block 12 that illustrates below Fig. 1 is used for being set in the play position of gear 3 of the strap cam of play mode; The pattern block 13 that illustrates below tiltedly at Fig. 1 is to be used for being set in fast sending to/the sending to fast/the rollback position of the gear 3 of the strap cam of rollback pattern.

Interior all sides at above-mentioned endless groove 10 form benchmark block 14, and it is used for the setting of reference position.The plane of this benchmark block 14 roughly makes triangle, and is provided in adjoining each other between locational 2 pattern blocks 11,13 that the outer circumferential side of endless groove 10 forms.The shape of this benchmark block 14 is as follows, promptly, benchmark block 14 along with the revolution of the gear 3 of strap cam with the combining under the projection 40 contacted occasions of following mode switch bar 30, by in conjunction with the revolution that combine the gear 3 that just can stop strap cam of projection 40 with the inclined-plane that is positioned at the gyratory directions front side of benchmark block 14.Interior all sides at endless groove 10 also form a plurality of projections, but the shape of these projections is as follows, promptly, these projections along with the revolution of the gear 3 of strap cam with the combining under the projection 40 contacted occasions of following mode switch bar 30, combined projection 40 is crossed along with gear 3 revolutions of strap cam.

The gear 3 of above-mentioned strap cam with main frame 2 facing to the inside form magnetic head cam 20.The head base 21 that dots from Fig. 1 is extended or the leading section of the outstanding actuating member 22 that is provided with is contacting with this magnetic head cam 20.Said head base 21 by figure unshowned guide member guiding and in the certain altitude position of leaving main frame 2, can set along the above-below direction of Fig. 1 shown in dotted arrow C, the D of Fig. 1 with moving freely, and the power that the applies effect of the unshowned base force application spring of figure that constitutes by extension spring etc. and by to the direction application of force shown in the arrow C of Fig. 1, so that actuating member 22 is often contacted with magnetic head cam 20.That is, the power that applies of base force application spring can make actuating member 22 often contact with magnetic head cam 20, and by magnetic head cam 20 gear 3 of strap cam often can be turned round along the gyratory directions shown in the arrow B.And, be integral rotating magnetic head cam 20 by gear 3 with strap cam, make head base 21 carry out linear reciprocating motion, just can make the magnetic head that is installed on the head base 21 carry out the advance and retreat of straight line with respect to the magnetic tape cassette that is housed in cassette interior thus along the above-below direction of Fig. 1 shown in the arrow C of Fig. 1, the D.

Left side at the gear 3 of above-mentioned strap cam is setting mode switch bar 30.The central portion of this mode switch bar 30 can supported freely to rotate by the bar fulcrum 31 that uprightly is arranged on the main frame 2.This bar fulcrum 31 is provided in the left side of the gear 3 of strap cam, and at the upside of output gear 6.In addition, also be provided with movement arm 32 and actuating arm 33 on mode switch bar 30, movement arm 32 stretches out from the right side of bar fulcrum 31, and actuating arm 33 extends in the left side of bar fulcrum 31.

The leading section of above-mentioned movement arm 32 with main frame 2 facing to the surface on form and combine projection 40, its plane roughly makes square.Make this in conjunction with projection 40 with main frame 2 facing to the end face and the bottom of endless groove 10 form and be slidingly connected.Also make and make in conjunction with the front end face that is positioned at Fig. 1 right side of projection 40 and can combine respectively with the inclined-plane, front side of the gear that is positioned at strap cam 3 gyratory directions of the anterior end surface of the gear that is positioned at strap cam 3 gyratory directions of above-mentioned 3 pattern blocks 11,12,13 and benchmark block 14.

The fore-end of above-mentioned actuating arm 33 is being connected with the iron core (plunger) 46 of solenoid 45, this iron core 46 often is positioned at the preceding inlet side of having advanced, by the power that applies of the unshowned bar force application spring of figure, be middle heart with mode switch bar 30 bullets to by Fig. 1 counter-clockwise direction shown in the arrow E of Fig. 1 with bar fulcrum 31.Thus, be under the non-driven state, just can make iron core 46 forward motion to preceding inlet side at solenoid 45, and can make movement arm 32 be positioned at the outer circumferential side of endless groove 10 in conjunction with projection 40, promptly, be positioned on the motion track of 3 pattern blocks 11,12,13.At this moment, by damaged 5a, 5b, 5c, the iron core 46 of solenoid 45 makes the radial outside ground that does not break away from endless groove 10 in conjunction with projection 40 limit slewing area.And when solenoid 45 is switched on, iron core 46 carries out setback and moves to and retreat end to Fig. 1 top, make mode switch bar 30 thus, with bar fulcrum 31 is middle heart along being rotated by Fig. 1 clockwise direction shown in the arrow F of Fig. 1, just can make the interior all sides that move to endless groove 10 in conjunction with projection 40.

Promptly, make iron core 46 carry out backward movement by driving solenoid 45, just can make mode switch bar 30 is that rotate around the clockwise direction shown in the arrow F of Fig. 1 at the center with bar fulcrum 31, what make movement arm 32 is positioned at all sides of endless groove 10 inside in conjunction with projection 40, in detail, can be positioned on the motion track of benchmark block 14.

Therefore by to the "on" position of solenoid 45 and the control of non-power status, just can make mode switch bar 30 carry out rotational action.And by making mode switch bar 30 carry out rotational action, just can make in conjunction with projection 40 and move, so that make on any one position of its all side that are arranged in endless groove 10 selectively and outer circumferential side.Promptly, by to the "on" position of solenoid 45 and the conversion of non-power status, just can be to controlling in conjunction with the position of projection 40.

By gear 3, mode switch bar 30 and the solenoid 45 of above-mentioned strap cam, and constituted the mode conversion device 50 that pattern is changed by the gear 3 of the strap cam of present embodiment and the binding site of mode switch bar 30.

In addition because the installing mechanism of box, be used to drive the idler wheel mechanism of box, other mechanisms such as travel mechanism of the magnetic tape cassette that constitutes by driving wheel and pinch wheel all be to use before known mechanism, thereby just omit explanation and diagram here to them.

Below, the effect by the present embodiment of said structure is described.

At first, action describes to mode switch with reference to Fig. 1～Fig. 3.

Fig. 1 is the primary structure vertical view of the main frame rear side of expression halted state.Fig. 2 is that expression is in the figure identical with Fig. 1 of broadcast state, and Fig. 3 is that expression is in fast and sends to/figure identical with Fig. 1 of rollback state.

As shown in Figure 1, be at the cassette tape player 1 of present embodiment it is implemented under the halted state of stop mode, on the magnetic head cam 20 of the gear 3 of the strap cam that constitutes mode conversion device 50 parts, the position 20a of the close gear fulcrum 4 around the magnetic head cam 20 contacts with actuating member 22.Like this, make tape base 21 be subjected to the power that the applies effect of base force application spring and move, magnetic head and magnetic tape cassette are left to the arrow C direction.And when solenoid 45 was in non-power status, iron core 46 was positioned at the preceding inlet side of having advanced to Fig. 1 below.Under this state, making mode switch bar 30 by the power that the applies effect of bar force application spring is that the center centers on the ground of counter-clockwise direction shown in the arrow E and rotates with bar fulcrum 31, makes the outer circumferential side that is positioned at endless groove 10 in conjunction with projection 40.At this moment, the power that applies by the base force application spring that transmits by magnetic head cam 20 and actuating member 22, with gear 3 bullets of strap cam to the arrow B direction, but owing to combining, thereby the gear 3 of strap cam is held in halted state in conjunction with the pattern block 11 of projection 40 with the stop position of the gear 3 that is used to set strap cam.In addition, the base force application spring has the function of force application component, applies power so that the gear 3 of strap cam turns round along gyratory directions.And, damaged 5a of the tooth 5 of the gear 3 of strap cam and output gear 6 facing to.

Then, when when operating, making solenoid 45 become the short time "on" position, draw iron core 46 by the excitation of solenoid 45 it is retreated recording or playback switch.Mode switch bar 30 is rotated to arrow F direction, make the interior all sides that move to endless groove 10 in conjunction with projection 40 with 11 disengagements of pattern block.At this moment, because to gear 3 application of forces of arrow B direction to strap cam, thereby in the moment of throwing off in conjunction with projection 40 and pattern block 11, make its arrow B direction revolution to the gyratory directions of regulation, make the tooth 5 and output gear 6 engagements of the gear 3 of strap cam, the gear 3 of strap cam is further driven to the arrow B direction by output gear 6.And, to time (pull up time) of solenoid 45 energising be the short time, when energising finishes, make before the iron core 46 and then revert to preceding inlet side, mode switch bar 30 is rotated to the arrow E direction, make the outside that revert to endless groove 10 in conjunction with projection 40.

Then, when make the gear 3 of strap cam when the arrow B direction only drives the angle of regulation by output gear 6, made in conjunction with projection 40 by the effect of the pattern block 11 that is used to set stop position to combine in contact with pattern block 12, this pattern block 12 is play position of the gear 3 of the rear side and being used to of gyratory directions that is arranged in the gear 3 of the strap cam strap cam of setting play mode.Thus, mode conversion device 50 is remained on mode switch bar 30 is remained on broadcast state on the play position, convert pattern to play mode.Fig. 2 represents this broadcast state.

Like this, be transformed into broadcast state at the gear 3 of strap cam when the arrow B direction is turned round from halted state, magnetic head cam 20 makes head base 21 move to arrow D direction by actuating member 22, and magnetic head is arrived and the contacted position of magnetic tape cassette.

As shown in Figure 2, be in the broadcast state at above-mentioned mode conversion device 50, the position 20b and the actuating member 22 away from gear fulcrum 4 of magnetic head cam 20 side faces of the gear 3 of strap cam join.And, combining in conjunction with the pattern block 12 of projection 40 with the play position of the gear 3 that is used to set strap cam, damaged 5b of the tooth 5 of the gear 3 of strap cam and output gear 6 facing to.Other state is the same with the halted state of above-mentioned mode conversion device 50, thereby has omitted the explanation to them.In addition, when mode conversion device 50 was maintained at broadcast state, cassette tape was clamped between driving wheel and the pinch wheel, by the revolution of driving wheel it is advanced, and was batched with on the cylinder.At this moment by recording with the contacted magnetic head of cassette tape or playing.

Then, to sending to fast or rollback switch when operating, similarly make solenoid 45 become the short time "on" position when recording or playback switch are operated, draw iron core 46 by the excitation of solenoid 45 it is retreated.Mode switch bar 30 is rotated to arrow F direction, make the interior all sides that move to endless groove 10 in conjunction with projection 40 with 12 disengagements of pattern block.At this moment, because the gear 3 of strap cam is applied in the power to the arrow B direction, thereby in the moment of throwing off in conjunction with projection 40 and pattern block 12, it is rotated to the arrow B direction, make the tooth 5 and output gear 6 engagements of the gear 3 of strap cam, the gear 3 of strap cam is further driven to the arrow B direction by output gear 6.When energising finishes to solenoid 45, make before the iron core 46 and then revert to preceding inlet side, mode switch bar 30 is rotated to the arrow E direction, make the outside that revert to endless groove 10 in conjunction with projection 40.

Then, when make the gear 3 of strap cam when the arrow B direction only drives the angle of regulation by output gear 6, make in conjunction with projection 40 by the pattern block 12 that is used to set play position to combine in contact with pattern block 13, this pattern block 13 be arranged in strap cam gear 3 gyratory directions rear side and be used to set fast and send to/the sending to fast or the rollback position of the gear 3 of the strap cam of rollback pattern.Thus, mode conversion device 50 is remained on mode switch bar 30 remained on fast to send to/rollback is locational to be sent to fast/the rollback state, pattern is converted to fast from play mode send to/the rollback pattern.Fig. 3 represents that this sends to/the rollback state fast.

Like this, be transformed into fast from broadcast state at the gear 3 of strap cam and send to/rollback state, when the arrow B direction is turned round, magnetic head cam 20 makes head base 21 move to the arrow C direction by actuating member 22, makes magnetic head arrive the position of leaving predetermined distance with magnetic tape cassette.

As shown in Figure 3, be in fast at above-mentioned mode conversion device 50 send to/the rollback state in, the joining away from the position 20c and the actuating member 22 of gear fulcrum 4 slightly of magnetic head cam 20 side faces of the gear 3 of strap cam.And combining in conjunction with the pattern block 13 of the sending to fast of projection 40 and the gear 3 that is used to set strap cam/rollback position, damaged 5c of the tooth 5 of the gear 3 of strap cam and output gear 6 facing to.Other state is the same with the halted state or the broadcast state of above-mentioned mode conversion device 50, thereby has omitted the explanation to them.Send to when mode conversion device 50 is maintained at fast/during the rollback state, cassette tape is sent or is batched with on the cylinder.At this moment magnetic head and cassette tape are in sunder.

Then, when shutdown switch is operated, to recording or playback switch, send to when operating and similarly make solenoid 45 become the short time "on" position fast, draw iron core 46 by the excitation of solenoid 45 it is retreated with the rollback switch with above-mentioned.Mode switch bar 30 is rotated to arrow F direction, make the interior all sides that move to endless groove 10 in conjunction with projection 40 with 13 disengagements of pattern block.At this moment, because the gear 3 of strap cam is applied in the power to the arrow B direction, thereby in the moment of throwing off in conjunction with projection 40 and pattern block 13, it is rotated to the arrow B direction, make the tooth 5 and output gear 6 engagements of the gear 3 of strap cam, the gear 3 of strap cam is further driven to the arrow B direction by output gear 6.When energising finishes to solenoid 45, make before the iron core 46 and then revert to preceding inlet side, mode switch bar 30 is rotated to the arrow E direction, make the outside that revert to endless groove 10 in conjunction with projection 40.

Then, when make the gear 3 of strap cam when the arrow B direction only drives the angle of regulation by output gear 6, send to by being used to set fast/the pattern block 13 of rollback position makes in conjunction with projection 40 and combines in contact with pattern block 11, and the rear side and being used for of gyratory directions that this pattern block 11 is configured in the gear 3 of strap cam is set the gear 3 residing stop positions of the strap cam of stop mode.Thus, make mode conversion device 50 remain on the halted state that mode switch bar 30 is remained on stop position, promptly, pattern revert to stop mode shown in Figure 1.

Like this, the gear 3 of strap cam from send to fast/the rollback state exchange to halted state when the arrow B direction is turned round, in conjunction with the equipping position of projection 40 by benchmark block 14.At this moment, owing to be positioned at the outer circumferential side of endless groove in conjunction with projection 40, thereby can not interfere in conjunction with the motion track of projection 40 with benchmark block 14, be not related in conjunction with projection 40 and benchmark block 14.

In addition, convert to fast from halted state and to send to/occasion of rollback state, realize by solenoid 45 being carried out 2 short time energisings.

Like this, in the cassette tape player 1 of present embodiment, same with former sound-track engraving apparatus, can be according to the gear 3 of strap cam and the binding site of mode switch bar 30, according to stop mode, play mode, send/order of rollback pattern switching motion pattern in turn fast to.

Below, the set positions action of mode conversion device 50 of the cassette tape player 1 of present embodiment is described with reference to Fig. 1 and Fig. 4.

Fig. 4 is the synoptic diagram of expression reference position hold mode.

In the cassette tape player 1 of present embodiment, when the initial actuating that is undertaken by the operation of energized, perhaps the stipulated time is in use carried out the setting action of position, to prevent the false judgment to stop position and play position.The setting action of this position is by implementing with combining of benchmark block 14 in conjunction with projection 40.

Promptly, solenoid 45 is carried out the energising of certain hour.Importantly to obtain the gear 3 that can make strap cam this conduction time and drive the above time of 1 circle.And, in case solenoid 45 is carried out the energising of certain hour, then can draw iron core 46 and it is retreated.Mode switch bar 30 is rotated to arrow F direction, make the interior all sides that move to endless groove 10 in conjunction with projection 40 with 11 disengagements of pattern block.

At this moment, because the gear 3 of strap cam is applied in the power to the arrow B direction, thereby the arrow B direction rotation towards the gyratory directions of regulation in the moment of throwing off in conjunction with projection 40 and pattern block 11, make the tooth 5 and output gear 6 engagements of the gear 3 of strap cam, the gear 3 of strap cam is driven to the arrow B direction.Owing to be positioned at the inboard of endless groove 10, thereby make in conjunction with projection 40 and contact, the revolution of the gear 3 of strap cam is stopped in the moment of both combinations with the benchmark block 14 that is used to set the reference position in conjunction with projection 40.Fig. 4 represents the reference position hold mode that this reference position has been set.

In addition, though interior all sides at endless groove 10, except benchmark block 14, also form a plurality of projections, but because in conjunction with under projection 40 and the contacted occasion of these projections, to push in conjunction with projection 40 by these projections, make attractive force that iron core 46 overcomes solenoid 45 along with the revolution of the gear 3 of strap cam the height degree of the projection of advancing, just can make in conjunction with projection 40 and cross over each projections.In other words, promptly benchmark block 14 make can not be along with the revolution of the gear 3 of strap cam and the shape of crossing in conjunction with projection 40.

As shown in Figure 4,, draw iron core 46 by the excitation of solenoid 45 it is retreated, mode switch bar 30 is rotated to arrow F direction, make the interior all sides that move to endless groove 10 in conjunction with projection 40 being under the hold mode of reference position.And, in conjunction with projection 40 with the inboard that is positioned at endless groove 10 and the benchmark block 14 of reference position that is used to set the gear 3 of strap cam combine.Have again, 5 damaged 5d of tooth of the gear 3 of strap cam and output gear 6 facing to, contacting with actuating member 22 of the magnetic head cam 20 of the gear 3 of strap cam apart from gear fulcrum 4 the 2nd near side face position 20d, by the power that the applies effect of the base force application spring that transmits by magnetic head cam 20 and actuating member 22, to the gear 3 of strap cam towards the arrow B direction application of force.

Then, when finishing, make before the iron core 46 and then revert to preceding inlet side, mode switch bar 30 is rotated to the arrow E direction, make the outside that revert to endless groove 10 in conjunction with projection 40 and benchmark block 14 leave solenoid 45 energisings.

At this moment, since the gear 3 of strap cam by towards bullet to the arrow B direction application of force, thereby in the moment of throwing off, promptly combining the moment that projection 40 and combining of benchmark block 14 are disengaged in conjunction with projection 40 and benchmark block 14, the gear 3 of strap cam rotates towards the arrow B direction of regulation gyratory directions, make the tooth 5 and output gear 6 engagements of the gear 3 of strap cam, the gear 3 of strap cam is further driven to the arrow B direction by output gear 6.

Then, by output gear 6 with the gear 3 of strap cam when the arrow B direction only drives certain angle, made in conjunction with projection 40 by the benchmark block 14 that is used to set the reference position to contact and combination with pattern block 11, above-mentioned pattern block 11 is used to the rear side of the gyratory directions of the gear 3 setting stop position and be configured in strap cam.Like this, just can stably mode conversion device 50 be remained on the halted state that mode switch bar 30 is remained on stop position as illustrated in fig. 1, pattern is converted to stop mode, converts the state of waiting for the input of accepting the operator to.

Promptly, the cassette tape player 1 of present embodiment when the setting action of carrying out the position, in case solenoid 45 is driven, what just make mode switch bar 13 is arranged in all sides of endless groove 10 and any side of outer circumferential side selectively in conjunction with projection 40.And, when under the state that is positioned at endless groove 10 all sides in conjunction with projection 40, making gear 3 revolutions of strap cam, make in conjunction with projection 40 not combine and only combine, with the revolution of the gear 3 that stops strap cam with benchmark block 14 with the pattern block 11,12,13 of the gear 3 of strap cam.After this, make when making solenoid 45 drive (recurrence) round about in conjunction with projection 40 when all sides are positioned at outer circumferential side in endless groove 10, make gear 3 revolutions of strap cam, the pattern block 11 of setting stop mode in conjunction with being used in the pattern block 11,12,13 of 40 of projections and the gear 3 of strap cam is combined, stop the revolution of the gear 3 of strap cam thus.

Like this, owing to mode switch bar 30 must be in stop position, stop gear 3 revolutions of strap cam after through the reference position, thereby can stably judge stop position.The former play position detector switch that sets respectively consequently can be set, can reduce cost.

Owing to be provided with base force application spring in the cassette tape player 1 of present embodiment as force application component, make when separating with benchmark block 14 in conjunction with projection 40 and each pattern block 11,12,13, this force application component application of force so that the gear 3 of strap cam turn round to the gyratory directions shown in the arrow B, thereby when the bonding state of removing in conjunction with projection 40 and benchmark block 14, the gear 3 of strap cam is stably turned round.

The control of each action of the cassette tape player of present embodiment is implemented by the control part that CPU, storer etc. constitutes.And storing needed control program in the action control of cassette tape players 1 such as comprising above-mentioned mode switch, set positions in the storer.

The present invention is not limited to above-mentioned embodiment, can carry out all changes to the present invention as required.

The effect of invention

As mentioned above, if adopt the mode conversion device of cassette tape player of the present invention, Then can produce fabulous effect, the play position that sets respectively before can not needing detects and opens Close, can reduce cost easily and stably.

Claims (1)

1. the mode conversion device of a cassette tape player, have gear, the mode switch bar that can combine that is used for strap cam that a plurality of patterns are changed and be used to make above-mentioned mode switch bar to carry out the solenoid of rotational action with the gear of above-mentioned strap cam, according to the binding site of the gear of above-mentioned strap cam and above-mentioned mode switch bar and the switching motion pattern, it is characterized in that

The gear of above-mentioned strap cam is provided with: the endless groove that slides in conjunction with projection of above-mentioned mode switch bar; Be provided in the outer circumferential side of this endless groove, on the exercises mode position can with the above-mentioned pattern block that combines the projection combination; Be provided in above-mentioned endless groove interior all sides, be used to set the benchmark block of reference position;

The said reference block be configured in the above-mentioned exercises pattern block be used to set stop mode the time the front side of gyratory directions of gear equipping position, above-mentioned strap cam of pattern block of stop position, in case make above-mentioned in conjunction with projection with after the said reference block combines, just combine with the pattern block that is used to set above-mentioned stop position;

Be provided with force application spring, above-mentioned when separating with the benchmark block with above-mentioned exercises pattern block in conjunction with projection, this force application spring application of force so that the gear of above-mentioned strap cam turn round along gyratory directions.

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