JPH05258429A - Position detecting mechanism - Google Patents

Abstract

PURPOSE:To miniaturize members for mounting microswitches by precisely deciding the relative positions between the respective microswitches. CONSTITUTION:A pair of pieces 36, 37 which are to be detected and are parted at the distance approximately equal to the movable distance of a cam plate 30 for making loading operation, etc., of a recording and/or reproducing device are provided on this cam plate 30. The first microswitch 40 operated by the one piece to be detected and the second microswitch 39 operated by the other piece to be detected are provided approximately in the same position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a position detecting mechanism useful when applied to a loading mechanism of a recording and / or reproducing apparatus.

[0002]

2. Description of the Related Art Conventionally, there has been proposed a recording and / or reproducing apparatus for recording and / or reproducing an information signal by using a tape cassette in which a magnetic tape is housed in a cassette.
This tape cassette has the above-mentioned cassette formed into a housing, a pair of tape reels rotatably supported in the cassette, and the above-mentioned magnetic tape wound between these tape reels. Is configured.

Then, the recording and / or reproducing apparatus is
The magnetic tape is operated to run, and a magnetic head, which is an information signal writing and / or reading device, is brought into sliding contact with the magnetic tape to record and / or reproduce the information signal. That is, this recording and / or reproducing apparatus is configured to include a rotating operation mechanism for rotating and operating each of the tape reels, a tape running mechanism for running and operating the magnetic tape, and the magnetic head.

The rotation operation mechanism has a pair of reel shafts that are rotated by a motor or the like, and these reel shafts are made to correspond to reel shaft engagement holes provided in the central portions of the respective tape reels. The tape reel is inserted and engaged, and each tape reel is rotated. That is, in this recording and / or reproducing apparatus, the tape cassette is transported to a predetermined mounting position such that each reel shaft can be inserted corresponding to the reel shaft engaging hole of each tape reel, that is, ,
A loading operation needs to be done.

Then, the recording and / or reproducing apparatus is
It has a tape cassette loading mechanism for performing the above loading operation. The cassette loading mechanism includes a cassette compartment that holds the tape cassette when the tape cassette is inserted and operated, and a transport mechanism that moves and operates the cassette compartment that holds the tape cassette. The tape cassette loading mechanism conveys the tape cassette held in the cassette compartment to the mounting position and mounts the tape cassette in the cassette mounting portion of the recording and / or reproducing apparatus.

This transport mechanism is constructed to have a cam plate or the like for moving the cassette compartment. The cam plate is formed to have a cam groove or the like, and is supported so as to be movable with respect to the recording and / or reproducing apparatus. The cam plate moves the cassette compartment by engaging a copying pin provided in the cassette compartment in the cam groove and moving the cam plate.

In this tape cassette loading mechanism, when the loading operation and the unloading operation of the tape cassette are completed, the completion of these operations is detected, and the motor for moving the cam plate or the like is detected. Need to be stopped. If the motor and the like are not stopped even after the loading operation and the unloading operation are completed, an excessive load may be generated on the motor and the cam plate, and the motor and the cam plate may be damaged. Because there is.

Therefore, the recording and / or reproducing apparatus is provided with a position detecting mechanism for detecting the position of the cam plate.

This position detecting mechanism is constituted by including a pair of first and second micro switches as position detecting means. The first micro switch is arranged on a fixed portion such as a chassis so that when the cam plate is moved in one direction, it is brought into contact with one side portion of the cam plate and operated. It The second micro switch is arranged on a fixed part such as a chassis so that when the cam plate is moved in the other direction, the second micro switch is brought into contact with the other side portion of the cam plate and operated. Is set up. That is, each of these micro switches is arranged at a position sandwiching the cam plate in the movable direction of the cam plate. The distance between the micro switches is a distance corresponding to the sum of the length of the cam plate in the movable direction and the movable distance of the cam plate.

[0010]

[Problems to be Solved by the Invention]

By the way, in the position detecting mechanism applied to the recording and / or reproducing apparatus as described above, since the micro switches are separated from each other, the relative positions of the micro switches are accurately determined. However, it is difficult to attach these micro switches to the chassis or the like.

If the relative position between the micro switches is not accurate, the position of the cam plate cannot be detected accurately, and the completion of the above-mentioned loading operation can be detected accurately. I can't.

Further, in the position detecting mechanism, since it is necessary to dispose the micro switches so as to be separated from each other, a chassis or the like for mounting the micro switches is long in the movable direction of the cam plate. The sheath must be longer than the movable distance of the cam plate.
Therefore, this position detection mechanism makes it difficult to downsize the device configuration of the recording and / or reproducing apparatus to which the position detection mechanism is applied.

Therefore, the present invention has been proposed in view of the above-mentioned circumstances, and it is possible to accurately detect the position of the movable member, and a recording and / or reproducing apparatus having a tape cassette loading mechanism and the like. It is an object of the present invention to provide a position detecting mechanism that can downsize the device configuration of a device having a movable member as described above.

[0015]

In order to solve the above-mentioned problems and achieve the above-mentioned object, the position detecting mechanism according to the present invention has a movable member which is movably supported by a fixed portion. First and second members to be detected, which are arranged in pairs at a distance substantially corresponding to the distance, and the first member to be detected, which is arranged on the fixed portion and operated by the first member to be detected. A first position detecting means for detecting the position of the first detected member; and a first position detecting means arranged on the fixed portion and operated by the second detected member to detect the position of the second detected member. Two position detecting means are provided, and the first and second position detecting means are arranged at substantially the same position in the movable direction of the movable member.

[0016]

In the position detecting mechanism according to the present invention, the first member to be detected is operated by the first member to be detected which is arranged on the fixed portion and movably supported on the fixed portion. First position detecting means for detecting the position of the first member to be detected, and a second member to be mounted on the fixed portion, which is paired with the first member to be detected and which is arranged on the movable member. Since the second position detecting means operated by the detecting member to detect the position of the second detected member are arranged at substantially the same position in the movable direction of the movable member,
The relative position between these position detecting means can be easily made accurate, and the fixing portion can be downsized.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings. This example is an example in which the position detecting mechanism according to the present invention is applied to a recording and / or reproducing apparatus for recording and / or reproducing an information signal using a tape cassette.

The tape cassette used in this recording and / or reproducing apparatus is constructed by housing a magnetic tape 209, which is a recording tape, in a cassette 202, as shown in FIGS. The above-mentioned cassette 202 is formed in a housing by combining upper and lower halves with each other. Inside the cassette 202, supply side tape reels 208 that are rotatably supported and pair with each other are provided.
Also, the take-up side tape reel 207 is stored. The magnetic tape 209 is wound around the hub portion of the supply-side tape reel 208, and the tip end portion of the supply-side tape reel 208 on the outer peripheral side is joined to the hub portion of the take-up tape reel 207. There is.

The portion of the magnetic tape 209 that extends between the tape reels 208 and 207 is, as shown in FIG. 15, along the open front surface of the cassette 202.
It is facing the outside. The front surface of the cassette 202 can be opened and closed by a lid 204 rotatably attached to the front side of the cassette 202.
That is, the lead 204 is formed in an elongated plate shape corresponding to the front surface portion of the cassette 202, and both end portions are supported by both front side portions of the cassette 202 via the support shaft portions 204a, It is rotatable so as to come in contact with and separate from the section. The lid 204 is rotated and separated from the front surface of the cassette 202 as shown by an arrow b in FIG. 15, so that the front surface is opened and the magnetic tape 209 is moved outward. 13 and FIG.
As shown in FIG. 4, the front surface of the cassette 202 is rotated to cover the magnetic tape 209 and close the front surface. The lid 204 is rotationally biased in the closing direction by a torsion coil spring (not shown).

The hub portions of the tape reels 208 and 207 are exposed to the outside through a pair of reel shaft insertion holes provided on the bottom surface of the cassette 202. Reel shaft engaging holes are provided at the lower ends of the hub portions of the tape reels 208 and 207, respectively. That is, the reel shaft engagement holes face the outside through the reel shaft insertion holes.

The reel shaft insertion holes can be opened and closed by a shutter member 203 mounted on the bottom surface of the cassette 202 so as to be slidable in the front-rear direction. The shutter member 203 has a pair of opening holes 211 and 210 having substantially the same diameter as the reel shaft insertion hole. This shutter member 203 is, as shown in FIG.
When the front side position is set, the above-mentioned opening holes 21
The reel shaft insertion holes 1 and 210 are displaced from the reel shaft insertion holes to close the reel shaft insertion holes. When the shutter member 203 is slid to the rear position, as shown by the arrow a in FIG.
The positions of 1 and 210 are made to correspond to the positions of the respective reel shaft insertion holes, and the reel shaft insertion holes are opened.

The shutter member 203 is provided with a biasing means such as a torsion coil spring so that the shutter member 203 does not come to a rear position to open the reel shaft insertion hole when the tape cassette 201 is not used. It is elastically biased to the front side which is the direction of the arrow a in FIG.

The shutter member 203 is provided with a pair of left and right shutter lock releasing grooves 212, 212. These shutter lock releasing grooves 212, 212
Are parallel to each other and are formed in the front-rear direction of the cassette 202. These shutter opening grooves 21
A pair of front and rear lock holes are formed in each of 2,212. These lock holes are provided in the cassette 202.
A lock piece that is arranged so as to be retractable and is biased in the protruding direction fits into the bottom surface of the. That is, the shutter member 203
Is locked at the front position by fitting the lock pieces into the lock holes on the rear side in the shutter lock releasing grooves 212, 212, and is locked at the shutter lock releasing grooves 212, 212. The lock pieces are fitted in the lock holes on the front side of the inside to be locked at the rear side position. Then, the shutter member 203 is unlocked by the lock pieces by the shutter release members entering the shutter lock release grooves 212 and 212 and pressing the lock pieces. It

Then, the recording and / or reproducing apparatus is
The magnetic tape 209 is run to operate the magnetic tape 2
A magnetic head is slidably contacted with the magnetic tape 09 to record and / or read information signals on the magnetic tape 209.

The tape cassette mounting portion, which is the main part of the recording and / or reproducing apparatus, has a chassis as shown in FIG. This chassis is composed of a chassis upper plate 1 and a chassis lower plate 2 which are supported in parallel with each other via a plurality of support members 3 and 3. Both sides of the chassis upper plate 1 and the chassis lower plate 2 are supported by a left side support plate 14 and a right side support plate 15 which are paired with each other. The respective support plates 14 and 15 are vertically provided in parallel with each other on the main chassis of the recording and / or reproducing apparatus (not shown). The chassis plates 1 and 2 are supported by the support plates 14 and 15 so as to be inserted between the support plates 14 and 15. The chassis plates 1 and 2 are supported by being tilted forward by a predetermined angle of, for example, about 20 ° with respect to the main chassis.

On the chassis, there are arranged a rotary drive mechanism for rotating and operating the tape reels 208 and 207, a tape running mechanism for running and operating the magnetic tape 209, and the magnetic head. That is, the tape reels 208, 20 are provided between the chassis plates 1, 2.
A pair of reel motors for rotating 7 are provided. Reel shafts 5 and 6 are attached correspondingly to the drive shafts of these reel motors. These reel shafts 5 and 6 project perpendicularly to the chassis upper plate 1 and above the chassis upper plate 1 through through holes provided in the chassis upper plate 1. These reel shafts 5, 6
As will be described later, when the tape cassette 201 is mounted on the chassis upper plate 1, the tape cassettes 201 are inserted corresponding to the reel shaft engagement holes of the tape reels 208 and 207, and the reel shaft engagements thereof are performed. The tape reels 207 and 208 can be rotated by the reel motors by engaging with the holes.

A rotary head device 4 incorporating the magnetic head is disposed on the chassis upper plate 1. The rotary head device 4 includes a lower drum and an upper drum, which are made of a material such as aluminum and have a substantially cylindrical shape and have the same diameter. The lower drum is fixedly disposed on the chassis upper plate 1. The upper drum is coaxial with the lower drum, and is rotatably supported on the lower drum. The upper drum is
It is rotated by a drum motor arranged between the chassis plates 1 and 2. The magnetic head is attached to the upper drum. In this magnetic head, the magnetic gap portion projects slightly outward from the outer peripheral surface portion of the upper drum. In the rotary head device 4, the magnetic tape 209 is wound around the outer peripheral surface of each drum, and the upper drum is rotated to bring the magnetic head into sliding contact with the magnetic tape 209.

On the chassis upper plate 1, the magnetic tape 209 is pulled out from the cassette 202 of the tape cassette 201 mounted on the chassis upper plate 1 and guided to a predetermined tape running path, and runs on the running path. A plurality of tape guides 7 for guiding the magnetic tape 209,
8, 10, 12 are arranged. These tape guides 7, 8, 10, 12 have a column-shaped tape guide portion, and can be moved and operated on the chassis upper plate 1. The tape guides 7 and 8 are mounted on the chassis upper plate 1 in a state where the tape cassette 201 is inserted into and engaged with the reel shafts 5 and 6 corresponding to the reel shaft engaging holes. , Located on the back side of the magnetic tape 209 on the front side of the cassette 202.
Inserted inside. And these tape guides 7, 8
Is moved on the chassis upper plate 1 to positions on both sides of the rotary head device 4. At this time, the magnetic tape 209 is pulled out toward the front side of the cassette 202 and wound around the rotary head device 4 over a predetermined angle range. The respective tape guides 7 and 8 are arranged on the chassis upper plate 1 by the positioning block 1.
Positioned by abutting on a and 1b.

Further, on the chassis upper plate 1, a capstan shaft 13 and a pinch roller 9 which serve as a tape traveling mechanism for feeding and operating the magnetic tape 209 guided to the traveling path.
Are arranged. The capstan shaft 13 is rotated at a predetermined constant speed by a capstan motor arranged between the chassis plates 1 and 2. The pinch roller 9 is supported on the tip end side of a pinch roller support arm 11 rotatably mounted on the chassis upper plate 1 and is movable on the chassis upper plate 1. The pinch roller 9 is used for the tape cassette 201.
When mounted on the chassis upper plate 1, it is positioned on the front side of the cassette 202 on the back side of the magnetic tape 209 and inserted into the cassette 202. Then, the pinch roller 9 is moved on the chassis upper plate 1 to a position where it abuts on the capstan shaft 13. At this time, the magnetic tape 209 is attached to the capstan shaft 13
And is pinched by the pinch roller 9. At this time, the magnetic tape 209 is
When is rotated, it is fed to the peripheral side of the capstan shaft 13 at the same speed. The tape guides 10 and 12 guide the running of the magnetic tape 209 at the front and rear positions in the running direction of the magnetic tape 209 held by the capstan shaft 13 and the pinch roller 9.

Then, on the chassis upper plate 1, when the tape cassette 201 is mounted on the chassis upper plate 1, a lid opening pin that abuts on the lid 203 and opens the lid 204. 1c is provided.

Then, the recording and / or reproducing apparatus is
It has a tape cassette loading mechanism configured to have the position detecting mechanism according to the present invention. This tape cassette loading mechanism is a cam plate 3 which is a movable member supported by the left side support plate 14 slidably in the front-rear direction.
0, and a cassette compartment 77, etc., which is disposed between the support plates 14 and 15 and is moved and operated according to the slide of the cam plate 30.

The cam plate 30 has a pair of support slits 3.
1, 32 are formed on a substantially flat plate. The cam plate 30 is formed by inserting a pair of cam support pins 28 and 29, which are erected on the outer side surface of the left support plate 14, corresponding to the support slits 31 and 32. As shown by an arrow L in FIG. 1, the left support plate 14 is slidable in the front-rear direction.

The cam plate 30 is moved by the loading motor 16 attached to the rear end side of the left side support plate 14 as described above.
It is designed to be slide operated. That is, a drive pulley 19 is attached to the drive shaft 18 of the loading motor 16. Then, the left side support plate 1
A driven pulley 21 is rotatably attached to the outer side surface portion of 4 via a support shaft portion 26. An endless drive belt 20 is wound around the drive pulley 19 and the driven pulley 21. The driven pulley 21 is rotated by the loading motor 16. A transmission gear 22 is integrally formed on the center side of the driven pulley 21. The transmission gear 22 meshes with a reduction gear 23 rotatably attached to the outer side surface of the left side support plate 14 via a support shaft portion 27. The reduction gear 23 includes a large-diameter gear portion 25 and the large-diameter gear portion 25.
And a small-diameter gear portion 24 coaxial therewith are formed integrally. The transmission gear 22 meshes with the large-diameter gear portion 25 of the reduction gear 23. The small-diameter gear portion 24 of the reduction gear 23 meshes with the rack gear portion 34 formed on the lower edge of the cam plate 30.

The cam plate 30 is provided with a rear switch pressing piece 37 which serves as a first detected member and a front switch pressing piece 36 which serves as a second detected member. These switch pressing pieces 37, 36 are projected from the lower edge of the cam plate 30 in a downward direction, that is, in a direction along the left side support plate 14 so as to be paired with each other. The distance between the switch pressing pieces 37 and 36 corresponds approximately to the slidable distance of the cam plate 30.

Then, on the left side support plate 14, there is provided a first micro as a first position detecting means which is pressed by the rear side switch pressing piece 37 when the cam plate 30 is at the front side position. Switch 39 and the cam plate 30
A second micro switch 40, which serves as second position detecting means that is pressed by the front switch pressing piece 36 when the switch is set to the rear position, is attached. These micro switches 39 and 40 are close to each other and are mounted at substantially the same position in the direction in which the cam plate 30 can slide. The first micro switch 39 and the second micro switch 40 are arranged on the same substrate 122. The substrate 122 is attached to the left side support plate 14 by a plurality of hooking claws 123 and 224 that are provided on the outer side surface of the left side support plate 14.

Then, the cassette compartment 7
7, the bottom plate portion 78 and the upper cover portion 91, as shown in FIG.
And are joined to each other and joined together, so that a front side and a rear side are formed into a housing shape having an open side. This cassette compartment 77 is the tape cassette 2 described above.
The tape cassette 201 can be inserted from the opened front side with the lid 204 as the front side.

The bottom plate portion 78 is provided with a pair of reel shaft insertion holes 80, 80. These reel shaft insertion holes 80, 80 are provided at positions corresponding to the reel shaft engagement holes 208, 207 when the tape cassette 201 is inserted and operated to a predetermined position in the cassette compartment 77. There is. Further, on the bottom plate portion 78, the shutter lock releasing groove portions 212, 212 are provided.
Shutter lock releasing projections 90, 90 corresponding to the above are provided in a protruding manner. These shutter lock releasing ridges 90, 9
When the tape cassette 201 is inserted into the cassette compartment 77, 0 corresponds to the shutter lock opening grooves 212, 212.
The lock pieces are pressed to release the locking of the shutter pieces 203 by the lock pieces.

Further, on the front end side of the bottom plate portion 78, in order to facilitate the insertion operation of the tape cassette 201 into the cassette compartment 77, a pair of tongue pieces 79, 79 are provided on the front side and slightly lower side. It is projected toward.

And this cassette compartment 7
7 is supported by the compartment support member 63 via a pair of rotation support shafts 93, 94 provided on both sides of the upper cover portion 91 so as to project outward. The compartment support member 63 is formed by bending a material such as a metal plate,
The left arm portion 64, the right arm portion 65, and a connecting portion that connects the respective arm portions 64 and 65 in parallel with each other are configured. These arm parts 64, 6
On the front end side of 5, there are formed support holes 73, 75 through which the respective rotary support shafts 93, 94 are correspondingly inserted. That is, in the cassette compartment 77, the rotation support shafts 93, 94 are inserted in correspondence with the support holes 73, 75, so that the compartment support member 63 of the compartment support member 63 as shown by an arrow N in FIG. It is rotatably supported at the front end position.

The support holes 73 and 75 are formed in a long hole shape with the longitudinal direction being the vertical direction. Further, a pair of spring attachment pieces 72, 74 are provided on the tip ends of the respective arm portions 64, 65. The coil portions of the pair of first torsion coil springs 71 and 76 are correspondingly fitted and supported on the spring mounting claws 72 and 74, respectively. These first torsion coil springs 71 and 76
The one arm part to the compartment support member 6
3 is locked corresponding to the locking claws 69 and 70 provided on the tip side of the arm portions 64 and 65, and the other arm portion is corresponding to the upper surface portions of the rotary support shafts 93 and 94. By making them abut, the cassette compartment 77 is elastically biased downward. That is, each of the rotation support shafts 9
The reference numerals 3 and 94 are pressed against the edge portions on the lower end side of the support holes 73 and 75 to be positioned.

In the compartment support member 63, the support shaft 66 provided on the left arm portion 64 is located substantially at the center of the left support plate 14 at the upper end side thereof, as shown by an arrow B in FIGS. 1 and 2. The support shaft hole 6 provided in the right arm portion 65 while being inserted into the support shaft insertion hole 41 provided.
As shown by an arrow A in FIGS. 1 and 2, a supporting shaft 42 protruding toward the inner side is inserted into the upper end side of the substantially central portion of the right side support plate 15 in FIG. 2 As indicated by the middle arrow M, the support plates 14 and 15 are rotatably supported between them. The support hole 67 is provided on the rear end side of the right arm portion 65. Also, the support shaft 66
Are provided at positions corresponding to the support holes 67 on the left arm portion 64. And this left arm part 6
The reference numeral 4 is extended rearward of the support shaft 66, and a first copying pin 68 is implanted near the extended rear end portion. The first copying pin 68 is projected to the outside of the left side support plate 14 through a notch portion 62 provided at the rear side position of the left side support plate 14.
And as indicated by an arrow C in FIG.
Of the loading cam groove 33.

On the inner side of the right side support plate 15, there is a hooking projection piece 44 for supporting the rear end side of the right side arm portion 65 of the compartment support member 63 for preventing it from coming off from the support shaft 42. It is projected. The front end side of the support protrusion 44 has a hook shape, and the rear end side of the right arm portion 65 is hooked and supported.

The first loading cam groove 33 is located below the front linear portion along the sliding direction of the cam plate 30, that is, along the front-rear direction and along the front-rear direction. It is composed of a rear-side straight line portion formed as described above and an inclined portion that connects these straight line portions. That is, when the cam plate 30 is at the front side position, the first copying pin 68 is inserted into the rear side linear portion to hold the first copying pin 68 at the lower side position. To do. At this time, the cassette compartment 77 is separated from the chassis upper plate 1. Further, when the cam plate 30 is at the rear side position, the first copying pin 68 is inserted through the front side linear portion, and the first copying pin 68 is held at the upper side position. To do. At this time, the cassette compartment 77 is brought close to the chassis upper plate 1 so as to substantially come into contact therewith.

By the way, a slider member is attached to the cassette compartment 77. This slider member comprises a pair of left and right sliders 100,1.
01 and the cassette pressing shaft 102. Each of the sliders 100 and 101 is formed in the shape of an elongated plate extending in the front-rear direction substantially corresponding to both side surfaces of the cassette compartment 77. The cassette pressing shaft 102 includes the sliders 100, 1
01 is supported between the sliders 100 and 101 with both ends attached.

Each of the sliders 100 and 101 has, at the rear end side thereof, a support piece portion projecting in a direction toward the inner side of the cassette compartment 77. It is placed on the upper surface of the rear portion of the cover portion 91. Then, these sliders 100, 10
The reference numeral 1 is located below the rotary support shafts 93 and 94. That is, the sliders 100 and 101 are restricted from moving upward by the rotary support shafts 93 and 94, and are moved downward by the abutment of the supporting piece portions with the upper cover portion 91. 2 is restricted, it is slidable in the front-rear direction with respect to the cassette compartment 77, as indicated by arrow Q in FIG.

Then, the sliders 100 and 101 described above are used.
2 have engaging cam grooves 104 and 105, respectively, and as shown by arrows D and E in FIG. 2, a pair of engaging pins 92 and 92 projecting from both front side portions of the upper cover 91. Are inserted corresponding to these cam grooves 104, 105. These cam grooves 104 and 105 are formed in the sliders 1 described above.
It is formed along the sliding direction of 00 and 101, and the rear end side portion is slightly bent upward. That is, when the sliders 100 and 101 are slid to the frontmost side with respect to the cassette compartment 77, the front end side is moved slightly downward.

The cassette pressing shaft 102 is located on the front side of the cassette compartment 77 and faces the open portion into which the tape cassette 201 is inserted, but the sliders 100 and 101 are slid forward. When the front ends of the sliders 100 and 101 are moved slightly downward, they are moved downward from the open portions.

A pair of eject claws 108 and 109 are provided corresponding to the support pieces of the sliders 100 and 101, respectively. Each of these eject claws 108,
The reference numeral 109 hangs down from each of the support pieces, and is located facing the open rear side of the cassette compartment 77.

Also, the above-mentioned cassette compartment 77
A left side tension coil spring 114 and a right side tension coil spring 115 are attached to. The left and right tension coil springs 114 and 115 are formed by a spring support piece 97 protruding from the rear side of the upper surface of the upper cover 91.
As shown by arrows H and I in FIG. 2, one end side is hooked. The spring support piece 97 is provided at the center position of the upper cover portion 91 in the left-right direction.

The other end of the left side tension coil spring 114 is hooked on a left side urging lever 110 rotatably attached to the left side portion on the rear side of the upper surface of the upper cover portion 91. This left-side biasing lever 110 is indicated by an arrow F in FIG.
As shown by, the substantially central portion is rotatably supported by a supporting hole 95 formed in the upper surface portion of the upper cover portion 91 via a support shaft portion 116. This left biasing lever 1
In the reference numeral 10, the engaging pin 118 projecting from one end side is inserted into and engaged with the engaging slit 106 formed in the supporting piece portion of the left slider 100. This engagement slit 106
Are formed with the longitudinal direction as the left-right direction. The other end of the left-side tension coil spring 114 is provided at the position between the support shaft portion 116 of the left-side biasing lever 110 and the engagement pin 118 so as to project rearwardly. Are hung on. The left-side tension coil spring 114 operates the left-side urging lever 110 as shown in FIG.
As indicated by the middle arrow O, the engaging pin 118 is urged to rotate in the direction of moving to the rear side. That is, the left side tension coil spring 114 is provided in the left side slider 1
00 is urged to the rear side via the left urging lever 110.

Further, the right side tension coil spring 115 is also provided.
The other end side of the right side bias lever 111 is rotatably attached to the right side portion on the rear side of the upper surface of the upper cover portion 91. As shown by an arrow G in FIG. 2, the right side biasing lever 111 has a substantially central portion at the upper cover portion 91.
The support shaft portion 11 is inserted into the support hole 96 formed in the upper surface portion of the support shaft portion 11.
It is rotatably supported via 7. This right-side biasing lever 111 has an engagement pin 119 protruding from one end side,
The engaging slit 107 formed in the supporting piece of the right slider 101 is inserted and engaged. The engagement slit 107 is formed with the longitudinal direction set to the right and right. The other end of the right side tension coil spring 115 is provided at the position between the support shaft portion 117 of the right side urging lever 111 and the engagement pin 119 so as to project rearwardly. Are hung on. The right tension coil spring 115 is provided on the right urging lever 111.
As shown by the arrow P in FIG. 2, the engaging pin 119 is rotationally biased in the direction of moving to the rear side. That is,
The right tension coil spring 115 moves the right slider 101 through the right biasing lever 111.
It is biased to the rear side.

Then, the biasing levers 110 and 111 described above are used.
The other end sides of the above overlap with each other at substantially the center position on the upper surface side of the upper cover portion 91. At the other end of the left-side biasing lever 110, a linking pin 121 is provided downwardly.
Is projected. A link slit 120 is formed on the other end of the right biasing lever 111. The link slit 121 is inserted and engaged with the link slit 120. That is, the biasing levers 110,
The sliders 111 and 101 are linked to each other so that the rotation angles from the initial state are always the same.
The slide amounts with respect to the cassette compartment 77 are equal to each other.

On the outer surface of the left slider 100,
The second copying pin 103 is provided so as to project. The second copying pin 103 is, as shown by an arrow J in FIGS. 1 and 2,
A third loading cam groove 38 formed in the front part of the left side support plate 14 is inserted into a third loading cam groove 60 formed in the front side portion of the cam plate 30 with its lower side opened. The cam plate 30 is inserted when it is in the front position.

The second loading cam groove 38 is a front straight portion for sliding the sliders 100 and 101 with respect to the cassette compartment 77, and the cassette compartment 77 with respect to the compartment support member 63. And a first arcuate portion for rotating the same and the compartment supporting member 63.
And a second arc-shaped portion formed along the rotation locus of No. 1, which are sequentially formed from the front side.

A lid 51 is attached to the front end portion of each of the support plates 14 and 15 so as to extend between the support plates 14 and 15. The lid body 51 is formed in a substantially flat plate shape having a size capable of closing the front end portions of the respective support plates 14 and 15, and a pair of support projections 52 and 53 are attached to the back sides of both side portions. Has been. A support pin 54 is provided on the tip side of the left support projection 52. Further, a support hole 55 is formed on the tip side of the right side support projection 53. The lid 51 is configured such that the support pin 54 is fitted into a support hole formed in the front portion of the left side support plate 14, and the support hole 55 protrudes inward from the front portion of the left side support plate 15 inward. By inserting the support bar 45 provided, as shown by an arrow K in FIG.
It is rotatably supported with respect to 15. This lid 51
When it is rotated upward, it closes the front end portions of the support plates 14 and 15, and when it is rotated downward, it opens the front end portions of the support plates 14 and 15. To do.

The lid is a part of the outer casing of the recording and / or reproducing apparatus to which the tape cassette loading mechanism is applied, and the tape cassette insertion hole formed in the front side of the outer casing. To open and close.

The lid 51 is urged to rotate in the closing direction by the second torsion coil spring 47. That is, the second torsion coil spring 47 is supported by externally fitting the coil portion to the support pin 46 provided on the front portion of the left side support plate 14, and supports the one arm portion 48 with the left side support plate. It is hooked on a hooking protrusion 50 provided on the base 14, and the other arm portion 49 is hooked on the left side supporting protrusion 52 of the lid 51.

Then, the left side supporting projection 52 of the lid 51 is formed.
A pressed piece 58 is attached to the support member 59 via a support member 59. The tip side of the pressed piece 58 has the cam plate 3
It faces the pressing pin 35 attached to the front part of 0.
When the cam plate 30 is at the front side position, the lid body 51 is rotated downward by pressing the pressed piece 58 against the pressing pin 35, and the supporting plate 14,
Open between the front ends of 15.

The front part of the left side support plate 14 is
A notch 61 is provided to prevent the support member 59 from coming into contact with the left side support plate 14.

Further, a window 56 is opened in the lid 51 so that the upper plate 1 of the chassis can be observed from the outside even when the lid 51 is closed. The window 56 is closed by a see-through plate 57 made of a transparent material.

In the recording and / or reproducing apparatus constructed by applying the position detecting mechanism according to the present invention as described above, when the tape cassette 201 is mounted in the recording and / or reproducing apparatus, the loading motor is used. 1
6 is activated to bring the cam plate 30 to the front position and unload it as shown in FIG.

In this unloading state, as shown in FIG. 11, the cam plate 30 is not shown because the rear side switch pressing piece 37 presses the pressing element 39a of the first micro switch 39. The front position is detected by the control device or the like. When the pressing element 39a of the first micro switch 39 is pressed, the loading motor 16 causes the cam plate 30 to move.
The rotational drive in the direction of further moving the vehicle is prohibited.

In this unloading state, as shown in FIG. 6, the first copying pin 68 is inserted in the rear linear portion of the first loading cam groove 33, and the compartment supporting member 63 is The cassette compartment 77 is located at an upper position apart from the chassis upper plate 1. In the unloading state, the second copying pin 103 is
It is inserted into the third loading cam groove 60 and held on the front side, and is located in the vicinity of the front end of the front straight portion of the second loading cam groove 38. By holding the second copying pin 103 on the front side, as shown in FIG.
As shown in FIG.
As indicated by an arrow R in the drawing, each of the above tension coil springs 1
It is slid forward with respect to the cassette compartment 77 against the urging force of 14, 115. At this time, the cassette pressing shaft 102 is located slightly below the front side of the bottom plate 78. Further, since the second copying pin 103 is held on the front side, the cassette compartment 77 has a rotation position with respect to the compartment supporting member 63 that is oblique to the front side, as shown in FIGS. 5 and 6. It is in a state of facing the upper side. At this time, the front portion of the cassette compartment 77 is oriented in the same direction as the front linear portion of the second loading cam groove 38.

Further, in this unloading state, the lid body 51 is held in the open state as indicated by an arrow U in FIG. 5 by the pressed piece 58 being pressed by the pressing pin 35. Has been done.

In such an unloading state, the tape cassette 201 can be inserted into the cassette compartment 77. That is, as shown in (1) of FIG. 8, the tape cassette 201 extends between the front side portion of the bottom plate portion 78 and the cassette pressing shaft 102 so that the bottom plate portion 78 and the cassette pressing shaft 102 can be connected. The shutter member 203 is provided on the lower side of the lid 102, and the lid 20
4 is placed in such a direction as to face the inside of the cassette compartment 77. Then, the tape cassette 201 is manually inserted into the cassette compartment 77 up to a position where the rear edge thereof is slightly inside the cassette compartment 77 from the cassette pressing shaft 102.

Then, in this recording and / or reproducing apparatus, the loading motor 16 is activated, and
As shown in 0, the loading operation is performed by moving the cam plate 30 to the rear side. When the cam plate 30 is moved to the rear side, the second copying pin 103 is moved to the third loading cam groove 60 and the second loading cam groove by the urging force of the tension coil springs 114 and 115. It is guided by the front straight portion of 38 and moves rearward. At this time, the cassette pressing shaft 102, as shown by (2) in FIG.
It moves upward from a position slightly below the front side of the bottom plate portion 78 so as to face the rear end of the tape cassette 201, and then moves in a direction of pressing the rear end of the tape cassette 201.

When the second copying pin 103 is moved to the rear side, the biasing levers 110 and 111 in the cassette compartment 77 are moved by the biasing forces of the tension coil springs 114 and 115 in FIG. As indicated by the middle arrows S and T, the sliders 100 are rotated in a direction with one end side being the rear side, respectively.
101 is slid to the rear side. In this process, the tape cassette 201 is (2) shown in FIG.
As shown in (5) to (5), the cassette pressing shaft 1
The rear end edge is pressed by 02 and is moved to the inner side of the cassette compartment 77. At this time, the shutter lock releasing ridges 90, 90 enter the shutter lock releasing grooves 212, 212 to unlock the shutter member 203. A projection piece is provided at the rear edge portion of the bottom plate portion 78 so as to come into contact with the front end portion of the shutter member 203. Therefore, as the tape cassette 201 moves inward of the cassette compartment 77, the shutter member 20
3 is operated to open the lid. That is, in this tape cassette loading mechanism, when the loading operation is started, the shutter member 203 is opened by the urging force of the tension coil springs 114 and 115.

As described above, when the shutter member 203 is opened, the reel shaft engaging holes pass through the lid opening holes 211 and 210 and the reel shaft insertion holes 80 and 80. It faces the chassis top plate 1 side. At this time, the second copying pin 103 is located at the boundary between the front straight portion of the second loading cam groove 38 and the first arc-shaped portion.

When the cam plate 30 is further moved to the rear side, the second copying pin 103 moves the second copying pin 103 to the second position.
Is moved along the first arc-shaped portion of the loading cam groove 38. At this time, the second copying pin 103 is
It is still inserted in the third loading cam groove 60. Further, the first copying pin 68 is still inserted in the rear linear portion of the first loading cam groove 33, and does not move the compartment supporting member 63. The first arcuate portion is formed in an arcuate shape centered on an axis connecting between the rotation support shafts 93 and 94, which is a rotation center axis of the cassette compartment 77 with respect to the compartment support member 63. Therefore, the cassette compartment 77 is rotated with respect to the compartment support member 63. When the second copying pin 103 moves from the first arc-shaped portion to the second arc-shaped portion in the second loading cam groove 38, the cassette compartment 77 causes the top plate portion 78 to move. The chassis plate 1
It is said to be parallel to. At this time, the first copying pin 68 is located at the boundary between the rear linear portion and the inclined portion in the first loading cam groove 33.

When the cam plate 30 is further moved to the rear side, the first copying pin 68 is moved to the rear side as shown in FIG.
In the first loading cam groove 33, it reaches the front straight portion through the inclined portion, and the compartment supporting member 63 is rotated. At this time, the second copying pin 103 is moved along the second arc-shaped portion of the second loading cam groove 38, as shown by the arrow Y in FIG. Further, the second copying pin 103 is pulled out downward from the third loading cam groove 60. The second arcuate portion is formed in an arcuate shape centered on an axis connecting the support shafts 66, 42, which serves as a rotation center axis for the support plates 14, 15 of the compartment support member 63. There is. Then, the cassette compartment 77 is brought closer to the chassis plate 1 with the top plate portion 78 being parallel to the chassis plate 1.

At this time, the tape cassette 201 is
It is mounted on the chassis upper plate 1. That is, the reel shafts 5 and 6 are connected to the tape reels 208 and 207, respectively.
Is engaged with the reel shaft engaging hole. In addition, the cassette 202 includes the first torsion coil springs 71 and 76.
Is urged to the chassis upper plate 1 via the rotary support shafts 93 and 94 and the upper cover portion 91. The lid 204 of the tape cassette 201
Is brought into contact with a lid opening pin 1c provided on the chassis upper plate 1 to open the lid.

Further, in the course of this loading operation, in the lid 51, as the cam plate 30 moves to the rear side, the pressed piece 58 causes the pressed piece 58 to move.
It is no longer pressed by 5, and is closed by the urging force of the second torsion coil spring 47, as indicated by arrow Z in FIG.

When the loading operation is completed in this way, the front side switch pressing piece 36 of the cam plate 30 presses the pressing element 40a of the second micro switch 40 as shown in FIG. By doing so, it is detected by the control device or the like that the vehicle is in the rear position. When the control device detects that the cam plate 30 is at the rear side position, it stops the loading motor 16 and stops the cam plate 30. That is, when the pressing element 40a of the second micro switch 40 is pressed, the loading motor 16 is prohibited from being rotationally driven in the direction in which the cam plate 30 is moved further rearward.

In this recording and / or reproducing apparatus,
When the loading operation of the tape cassette 201 is completed as described above, the tape guides 7, 8 and 10 are moved on the chassis upper plate 1 to wind the magnetic tape 209 around the rotary head device 4. A tape loading operation is performed. When the tape loading operation is completed, the rotary head device 4 is
It is possible to write and / or read an information signal to / from the magnetic tape 209.

In order to remove the tape cassette 203 in this recording and / or reproducing apparatus, first,
A tape unloading operation is performed. This tape unloading operation is performed by the tape guides 7, 8, 1 described above.
0 is returned to the initial position, and each tape reel 20
By rotating 8 and 207, the magnetic tape 209 is rewound into the cassette 202.

The unloading operation for the tape cassette 201 is performed by the loading motor 1
6 is started and the cam plate 30 is moved to the front side. When the cam plate 30 is moved to the front side, first, the compartment supporting member 63 is pivotally operated by the insertion engagement of the first loading cam groove 33 and the first copying pin 68. The cassette compartment 77 is separated from the chassis upper plate 1. The lid 204 of the tape cassette 203 is closed by being separated from the lid opening pin 1c. At this time, the second copying pin 103 enters the third loading cam groove 60 from below. Next, the second copying pin 103 is inserted and engaged with the first arc-shaped portion of the second loading cam groove 38, whereby the cassette compartment 77 is rotated with respect to the compartment support member 63. ..

Further, when the cam plate 30 is moved to the front side, the second copying pin 103 is moved to the front side by the third loading cam groove 60, and the second loading cam groove is moved. 38 along the front straight portion. By the movement of the second copying pin 103 to the front side, the sliders 100 and 101 are slid to the front side with respect to the cassette compartment 77.
At this time, the tape cassette 201, as shown in (1) to (4) of FIG.
The front end side where the lid 204 is provided is pressed by the eject claws 108 and 109 provided at 0 and 101,
Further, it is ejected to the outside of the cassette compartment 77 by the biasing force of the shutter member 203 in the closing direction.

When the cam plate 30 reaches the front position, the cassette pressing shaft 102 moves to a position slightly lower than the bottom plate portion 78 of the cassette compartment 77, as indicated by (5) in FIG. Therefore, the tape cassette 201 can be taken out from the cassette compartment 77.

[0079]

As described above, in the position detecting mechanism according to the present invention, the first object to be detected is provided on the movable member which is disposed on the fixed portion and is movably supported with respect to the fixed portion. A first position detecting means which is operated by a member to detect the position of the first detected member; and a first position detecting means which is arranged on the fixed portion and which is paired with the first detected member and which is arranged on the movable member. The second position detecting means, which is operated by the provided second detected member to detect the position of the second detected member, is arranged at substantially the same position in the movable direction of the movable member. It is set up.

Therefore, in this position detecting mechanism,
The relative position between the respective position detecting means can be easily made accurate. In addition, in this position detecting mechanism, the fixed portion in which each of the position detecting means is arranged can be downsized.

That is, according to the present invention, the position of the movable member can be accurately detected, and the device configuration of the device having the movable member such as the recording and / or reproducing apparatus having the tape cassette loading mechanism can be downsized. It is possible to provide a position detection mechanism that can be achieved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a configuration of a main part of a recording and / or reproducing apparatus to which a position detecting mechanism according to the present invention is applied.

FIG. 2 is an exploded perspective view showing a cassette compartment constituting the recording and / or reproducing apparatus.

FIG. 3 is a plan view showing a configuration in a state where the tape cassette of the cassette compartment can be inserted and removed.

FIG. 4 is a plan view showing a configuration of the cassette compartment in an initial state.

FIG. 5 is a side view showing a configuration of a main part of the recording and / or reproducing apparatus.

FIG. 6 is a side view showing a configuration in a state where a tape cassette of a main part of the recording and / or reproducing apparatus can be inserted and removed.

FIG. 7 is a side view showing a configuration of a main part of the recording and / or reproducing apparatus in an initial state.

FIG. 8 is a side view showing the positional relationship between the cassette compartment, the tape cassette, and the slider member when the tape cassette is inserted into the cassette compartment in the recording and / or reproducing apparatus, with a part thereof broken away; (1) shows the start of the insertion operation, (2) shows the state where the cassette pressing portion of the slider member is in contact with the tape cassette, and (3) shows the shutter member reaching a predetermined position in the cassette compartment. Shows the state, (4) shows the state where the opening of the shutter member is started, (5)
Shows the state where the opening of the shutter member is completed.

FIG. 9 is a side view showing a partial cutaway of the positional relationship between the cassette compartment, the tape cassette and the slider member at the time of ejecting from the cassette compartment of the tape cassette in the recording and / or reproducing apparatus. (1) shows a state where the ejecting operation is started and the eject piece is in contact with the tape cassette, (2) shows a state where the closing of the shutter member is started, and (3) shows a state where the closing member of the shutter member is opened. A completed state is shown, (4) shows a state where the ejection operation of the tape cassette by the eject piece is completed, and (5) shows a state where the tape cassette is taken out from the cassette compartment.

FIG. 10 is a side view showing a configuration of a left side support plate provided with the position detection mechanism.

FIG. 11 is a view showing the recording and / or recording in the position detecting mechanism.
Alternatively, it is an enlarged side view of essential parts showing a state where the cam plate is pressing the first micro switch when the tape cassette can be inserted and removed in the reproducing device.

FIG. 12 is a view showing the recording and / or recording in the position detecting mechanism.
Alternatively, it is an enlarged side view of an essential part showing a state where the cam plate is pressing the second micro switch when the loading operation of the tape cassette in the reproducing apparatus is completed.

FIG. 13 is a perspective view showing a configuration of a tape cassette mounted in the recording and / or reproducing apparatus.

FIG. 14 is a perspective view showing the configuration of the tape cassette as seen from the bottom side.

FIG. 15 is a perspective view showing a state in which a shutter member and a lid of the tape cassette are opened and viewed from the bottom surface side.

[Explanation of symbols]

 14: Left support plate 30: Cam plate 36: Front switch pressing piece 37 ··········· Rear side switch pressing piece 39 ······ First micro switch 40 ······· Micro switch

Claims (1)

[Claims] 1. A first member and a second member, which are arranged in pairs on a movable member supported so as to be movable with respect to a fixed portion, with a distance substantially corresponding to the movable distance of the movable member. A detection member and a first member disposed on the fixed portion and operated by the first detected member to detect the position of the first detected member.
Second position detecting means, which is disposed on the fixed portion and is operated by the second detected member to detect the position of the second detected member.
Position detecting means, wherein the first and second position detecting means are arranged at substantially the same position in the movable direction of the movable member.