JPH04206063A - Magnetic recording and reproducing apparatus - Google Patents

Abstract

PURPOSE:To make it possible to pull out a tape from the position by inserting the magnetic tape between a cylinder and a tape pulling-out post under the state wherein a reel and a reel stage are not engaged by the push-down motion for the front part of a cassette holder against a cassette-holder energizing means. CONSTITUTION:The front side of a cassette holder 41 is pushed down to the side of a chassis against the energizing force of a torsion spring 53. Then, the cassette holder 41 is turned with a supporting pin 87 as a supporting point, and a slant state is obtained. Then, the cassette holder 41 is moved in the direction where a guide pin 52 approaches a cylinder 24 horizontally in a guide groove 48 at the front side. The holder is supported with the supporting pin 87 at the rear side and turned around a synchronizing shaft 85. The holder is lowered and moved to a mounting position where a reel 34 and a reel stage 21 are engaged. At the same time as this movement, a tape pulling-out post 25 which is inserted into a bottom-surface opening part 36 of the tape cassette at the temporary mounting position is moved. Thus, the tape can be pulled out of that position.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tape cassette loading mechanism in a magnetic recording and reproducing apparatus that records and reproduces signals by winding a magnetic tape pulled out from a tape cassette around a cylinder.

2. Description of the Related Art In recent years, there has been a demand for miniaturization of helical scan type video cassette recorders (hereinafter abbreviated as VcR), and in order to meet this demand, efforts have been made to miniaturize each part. Among them, reducing the thickness and changing the arrangement of parts that affect the thickness.

One of the items that should be especially considered when trying to downsize a VCR is how thin the whole can be made by replacing it with something else. As one means of reducing the thickness, it is important to devise a tape cassette mounting mechanism.

The tape cassette loading mechanism of a conventional VCR will be described below. In addition, in the following description, if similar members are arranged on the left and right sides, the description will be limited to only one side.

FIG. 5 is a perspective view of a conventional VCR in a cassette attachment/detachment position. In FIG. 5, 1 is a cassette holder;
It is integrally constituted by a top plate 2, a side plate 3 bent on both sides thereof, a bottom plate 4 formed by bending the side plate 3 inward, and a stopper 5 bent upward in front of the bottom plate 4. The cassette holder 1 is supported by a sub-chassis 18 by a first link 6 and a second link 11. Among them, the first link 6 has one end connected to the subchassis 18 by the fulcrum pin 7.
A guide pin 8 is provided at the other end of the guide pin 8 and is loosely fitted into a T-guide groove 9 provided on the side plate 3 . Contrary to the first link 6, the second link 11 has a guide pin 13 protruding from one end and loosely fits into a guide groove 14 provided in the sub-chassis 18, and the other end is attached to the side plate 3 by a fulcrum pin 12. It is attached to the shaft.

Further, the first link 6 and the second link 11 are connected at the center by a connecting pin 16, which allows the cassette holder 1 to be moved close to and away from the sub-chassis 18 while remaining parallel to the sub-chassis 18. , first link 6
The cassette holder 1 is biased in a direction away from the sub-chassis 18 by a tension spring 17 stretched between a spring hanging hole 10 provided in the side plate 3 and a spring hanging pin 15 provided in the side plate 3. In this case, the guide pin 8 comes into contact with the right end of the guide groove 9 and is locked therein. The sub-chassis 18 is provided with a lid opening bin 19 that contacts the lid 32 of the tape cassette 31 shown in FIG. 7 to open the lid 32. Reel lock release hole 33 of tape cassette 31
The reel lock release bin 20 releases the reel lock by being inserted into the reel 34 of the tape cassette 31.
reel stand 21. engaged with the reel stand 21. A cassette guide 22 is arranged to regulate the position of the tape cassette 31 by coming into contact with the rear surface 35 of the tape cassette 31, and is slidable back and forth with respect to the main chassis 23. A cylinder 24 is fixed to the main chassis 23.

The operation of the VCR configured as described above will be explained below. FIG. 8 is a side view illustrating step-by-step the cassette loading operation using a conventional vCR. first,
The tape cassette 31 is in the cassette attachment/detachment position shown in FIG. 6a.
into the cassette holder 1 until it contacts the stopper 5. Next, move the cassette holder 1 by hand against the biasing force of the tension spring 17 to the position shown in FIG.
Push down to the 8 side. With this operation, the lid 32 is opened by the lid opening bin 19. When the lid 32 is opened, the tape cassette 31 tries to move backward inside the cassette holder 1 due to the reaction force, but at that time, the cassette guide 22 is already in a position where it comes into contact with the rear surface 35 of the tape cassette 31, so the cassette holder The position of tape cassette 31 within 1 does not change. Further, by pushing down the cassette holder 1, the reel lock is released by the reel lock release bin 20, and the reel 34 and the reel stand 2 are released.
1 is engaged. Further, at this position, the cassette holder 1 is locked to the sub-chassis 18 by a cassette holder locking mechanism (not shown).

Hereinafter, this position will be referred to as a temporary attachment position.

When the cassette holder 1 is locked, a holder lock detection switch (not shown) is activated to slide the sub-chassis 18 to the cassette mounting position shown in FIG. 6C. As a result, the bottom opening 3 of the tape cassette 31 shown in FIG.
The cylinder 24 enters into the cylinder 8 relatively, and the tape cassette 31 and the cylinder 24 come close to each other. Also, at the same time as the sub-chassis 18 was slid, the tape drawer post 25, which had been inserted into the bottom opening 36 of the tape cassette 31 at the temporary attachment position,
moves to pull out the tape, and the pulled-out magnetic tape 37 is wound around the cylinder 24. Then, signals are recorded and reproduced on the magnetic tape 37 wound around the cylinder 24.

Problems to be Solved by the Invention However, in the above conventional configuration, in order to bring the cylinder and tape cassette closer together, after opening the lid of the tape cassette, the sub-chassis on which the tape cassette is temporarily attached is slid relative to the main chassis. ing. Therefore, two chassis exist below the tape cassette. For this reason, even if the cassette could be made smaller in the front-rear direction, the thickness would inevitably increase compared to when only one chassis was required, creating the problem that the VCR could not be made smaller. .

The present invention solves the above-mentioned conventional problems, and the VCR can be made thinner because only one chassis is required, and furthermore, the cylinder and tape cassette can be placed close to each other, making it possible to reduce the size of the VCR.
The common purpose is to provide To do this, the lid opening port is unlocked with the reel and reel stand not engaged, and the magnetic tape can be pulled out, and then the tape cassette is inserted while relatively inserting the cylinder into the bottom opening of the tape cassette. The tape is guided to the mounting position by inserting the magnetic tape that is stretched across the front of the tape cassette between the cylinder and the tape pull-out post without the reel and reel stand engaging. The primary purpose is to enable withdrawals.

The second objective is to realize a path for relatively inserting a cylinder into the bottom opening of the tape cassette with a simple configuration as a path for the cassette holder to the cassette mounting position where the reel and reel stand are secured. do.

Furthermore, the third feature is that the lid can be opened in a state where the reel and reel stand are not engaged, and that the lid can be kept in the open state even if the cassette holder moves from the position where the lid is opened.
The purpose of

Means for Solving the Problems In order to achieve this first object, the magnetic recording and reproducing apparatus of the present invention includes a chassis in which a cylinder, a tape draw-out post, and a reel stand are arranged, a cassette holder for holding a tape cassette, cassette holder urging means for urging the front part of the cassette holder upward so that the tape cassette can be attached and removed; and cassette holder support means for rotatably supporting a support part provided at the rear part of the cassette holder. and a magnetic tape that is stretched over the front surface of the tape cassette by causing the cassette holder to rotate about the supporting portion by pushing down the front portion of the cassette holder against the cassette holder biasing means. is inserted between the cylinder and the tape draw-out post in a state where the reel of the tape cassette and the reel stand do not engage with each other.

In order to achieve the second object, the magnetic recording and reproducing apparatus of the present invention includes a chassis in which a cylinder is arranged, a cassette holder that holds a tape cassette, and a front part of the cassette holder that supports the front part of the cassette holder. cassette holder guide means for slidingly guiding the cassette holder in a direction toward and away from the cylinder, and cassette holder moving means for rotating the rear part of the cassette holder with respect to the chassis.

Furthermore, in order to achieve the third object, the magnetic recording and reproducing apparatus of the present invention includes a cassette holder for holding a tape cassette, a lid opening means for opening the lid of the tape cassette, and and a locking means for locking the lid opening means.

Operation The present invention has a configuration that achieves the first object described above, and after inserting the tape cassette into the cassette holder, the reel and reel stand are engaged by pushing down the front part of the cassette holder against the cassette holder biasing means. Since the magnetic tape is inserted between the cylinder and the tape pull-out post in a misaligned state, the tape can be pulled out from that position.

Furthermore, according to the configuration for achieving the above-mentioned second objective, the front part of the tape cassette slides and comes close to the cylinder and the rear part rotates and descends until the reel and reel stand are engaged. A path for relatively inserting the cylinder into the bottom opening of the tape cassette can be realized.

Furthermore, with the configuration that achieves the third objective described above, the lid is opened in a state where the reel and reel stand are not engaged, and the cassette holder is locked to maintain the lid in the open state, so that the lid is placed in the open position. The lid can be kept open even if the cassette holder moves.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a VCR at a cassette attachment/detachment position in an embodiment of the present invention. In FIG. 1, 41 is a cassette holder, which includes a top plate 42, side plates 43 bent on both sides thereof, a bottom plate 44 formed by bending the side plates 43 inward, and a stopper bent upward in front of the bottom plate 44. 45. Cassette holder 41
Includes a lid opening mechanism and a reel lock release mechanism, which will be described later.

and a tape winding mechanism. 46 is a chassis to which a supporting side plate 47 for supporting the cassette holder 41 is fixed, and on which the reel stand 21 and the cylinder 24 are arranged.

FIG. 2 is a perspective view of the lid opening mechanism and the reel lock release mechanism. FIG. 2 shows the relationship at the cassette mounting position, and shows only the main parts extracted from the whole. 4
Reference numeral 9 denotes a lid opening lever, which is pivoted to a support pin 50 provided on the side plate 43, and is connected to the tape cassette 3 shown in FIG.
A lid opening pin 51 that opens the lid when rotated clockwise from the position shown in FIG. 1 to the position shown in FIG. 2 while contacting the lid 32 of FIG.

Also, when the cassette holder 41 reciprocates between the cassette attachment/detachment position and the cassette attachment position, the support side plate 4 shown in FIG.
A guide pin 52 is protrudingly provided to loosely fit into a guide groove 48 provided at 7, support the cassette holder 41 on the front side, and guide the cassette holder 41 on the front side. Then, the torsion spring 53 fitted onto the support pin 50 releases the lid release pin 51 from the lid 32 and rotates the lid release lever 49 so as to keep the entire cassette holder 41 in the cassette attachment/detachment position separated from the chassis 46 shown in FIG. It is biased to rotate clockwise. Reference numeral 56 denotes a reel lock release member, which is pivoted to a support pin 57 provided on the side plate 43, and its central portion is bent and rotated counterclockwise from the position shown in FIG. 1 to the position shown in FIG. A reel lock release piece 5 is inserted into the reel lock release hole 33 of the tape cassette 31 shown in FIG. 7 to release the reel lock when
It is 8. Furthermore, the central part of the reel lock release member 56 is bent in a different direction from the reel lock release piece 58, and when rotated, the cassette contacts the rear surface 35 of the tape cassette 31 to regulate the position of the tape cassette 31. A guide 59 is provided. The lid release lever 49 and the reel lock release member 56 are connected by a connecting pin 54 provided on the lid release lever 49 loosely fitting into a long hole 60 provided on the reel lock release member 56. 49 rotates, the lock release member 56 also rotates in conjunction with the rotation. 61 is a locking member, and a support pin 62 (
1), and is biased clockwise in the figure by a tension spring 68 stretched between the spring hook hole 63 and the spring hook pin 65. Therefore, when the lid release lever 49 is in the position shown in FIG. When the lid opening lever 49 is rotated clockwise from the position shown in FIG. 1 to the position shown in FIG. The locking member 61 rotates counterclockwise once when the locking member 61 comes into contact with the locking pin 55, and after passing the locking pin 55, rotates clockwise to lock the locking pin 55. As a result, the lid release lever 49 is connected to the lid release lever 49 via the connecting pin 54.
The position of the cassette holder 41 is locked.

FIG. 3 is a perspective view of the tape winding mechanism. FIG. 3 shows the relationship at the cassette mounting position, and shows only the main parts extracted from the whole. Reference numeral 71 denotes a tape winding slider, which has an L-shape, and slide grooves 72 and 73 provided on the horizontal portion engage holding pins 74 and 75 provided on the bottom plate 44, respectively, so that the cassette can be removed. It is held by the holder 41 and is slidable in the front and rear directions. A leaf spring 77 is integrally provided at the center of the tape winding slider 71 by means such as welding, and a friction member 78 made of rubber or the like is fixed to the tip of the leaf spring 77 to generate friction when the tape winding slider 71 slides. The member 78 comes into contact with the reel 34 seen from the bottom of the tape cassette 31 shown in FIG. 7, and the reel 34 is rotated in the tape winding direction due to frictional force, thereby winding the magnetic tape 37. A take-up drive lever 79 is pivoted to a support pin 80 provided on the side plate 43, and when a drive pin 81 protruding from one end engages with a notch 76 of the tape take-up slider 71, the take-up drive is performed. The tape winding slider 71 slides in conjunction with the rotation of the lever 79. Reference numeral 83 denotes an arm, and a hole 84 at the end is press-fitted into a synchronizing shaft 85 supported by the supporting side plate 47 shown in FIG.
rotate in the same phase. Further, the center portion of the arm 83 is connected to a support pin 87 provided on a support plate 86 fixed to the side plate 43.
A drive pin 88 that is pivoted to support the cassette holder 41 on the rear side and is provided at the tip comes into contact with the take-up drive lever 79, thereby rotating the take-up drive lever 79 in accordance with the rotation of the arm 83. make it move. The relationship between the rotation of the arm 83 and the rotation of the take-up drive lever 79 will be explained. Third
The figure shows the cassette in the mounting position, in which the drive pin 88 is located away from the take-up drive lever 79. In this state, a torsion spring 82 fitted around the support pin 80 urges the take-up drive lever 79 to rotate clockwise so that the take-up drive lever 79 does not rotate counterclockwise. Furthermore, further clockwise rotation of the winding drive lever 79 is restricted by the right end of the slide groove 72 coming into contact with the holding pin 74. Further, in this state, the friction member 78 is in a position where it does not interfere with the engagement between the reel 34 and the reel stand 21. When moving from this mounting position to a temporary mounting position, which will be described later, the arm 83 rotates clockwise about the support pin 87 relative to the cassette holder 41.

At first, the drive pin 88 only moves along the circular arc portion 90 concentric with the support pin 87 of the take-up drive lever 79 and does not rotate the take-up drive lever 79. (after the arm 83 is removed) Rotate the take-up drive lever 79 until the arc portion 89 is concentric with the support pin 87, and even after the arc portion 88 is concentric with the support pin 87, the arm 83 continues to rotate and the drive The pin 88 moves to the end of the arc portion 89 and stops.

During this movement from the mounting position to the temporary mounting position, the tape winding slider 71 slides in conjunction with the winding drive lever 79 to wind the tape. When moving from the temporary attachment position to the attachment/detachment position shown in FIG.
8 only moves the circular arc portion 89 concentric with the support pin 87 of the take-up drive lever 79, and the take-up drive lever 79 does not rotate.

The reverse movement from the attachment/detachment position to the temporary attachment position is similar, and the arm 83 rotates clockwise, but the take-up drive lever 79 does not rotate. Further, when moving from the temporary mounting position to the mounting position shown in FIG. 3, the arm 83 rotates counterclockwise relative to the cassette holder 41. During this rotation, the drive pin 88 initially only moves the arc portion 89 and does not rotate the take-up drive lever 79, but halfway through the rotation, the drive pin 88 rotates the take-up drive lever 79 until the arc portion 90 becomes concentric with the support pin 87. make it move. Even after the arcuate portion 90 becomes concentric with the support pin 87, the arm 83 continues to rotate, and the drive pin 88 moves along the arcuate portion 90 and finally stops at a position removed from the arcuate portion 90.

The operation of the VCR configured as described above will be explained below.

FIG. 4 is a side view illustrating step-by-step the cassette mounting operation by the VCH in the embodiment of the present invention. First, in the cassette attachment/detachment position shown in FIG. 4a, the lid release pin 51
．． Reel lock release piece 58 and cassette guide 5
The tape cassette 31 is inserted into the cassette holder 41 until it comes into contact with the stopper 45 at this position. Next, the torsion spring 53
Push the front side of the cassette holder 41 down toward the chassis 46 by hand against the urging force of. As a result of the push-down operation, the cassette holder 41 rotates about the support pin 87 as a fulcrum, as shown in FIG. 4, and enters an inclined state.

Hereinafter, this position will be referred to as a temporary attachment position.

By pressing down, the lid release lever 49 releases the guide pin 52.
is loosely fitted into the guide groove 48 shown in FIG.
The reel is also rotated to release the reel lock. When the lid 32 is opened, the tape cassette 31 tries to move backward inside the cassette holder 41 due to the reaction force, but at that time, the cassette guide 59, which is integrally formed with the reel lock release member 56, Rear surface 35
Since the tape cassette 31 is in contact with the cassette holder 41, the position of the tape cassette 31 within the cassette holder 41 does not change. Further, at this time, the positions of the lid release lever 49 and the reel lock release member 56 relative to the cassette holder 41 are locked by the locking member 61, and this positional relationship is maintained throughout the period from the temporary mounting position to the mounting position. When the tape cassette 31 is temporarily installed, a temporary installation detection switch (not shown) is turned on, the installation motor (not shown) starts rotating, and this rotational force is transmitted to the arm 83 via a transmission means such as a gear. The arm 83 is rotated counterclockwise around the synchronization shaft 85.

As a result, the cassette holder 41 is attached to the guide pin 52 at the front side.
The reel 34 moves horizontally in the guide groove 48 in a direction approaching the cylinder 24, is supported by the support pin 87 on the rear side and rotates around the synchronization shaft 85, and descends to form the reel 34 shown in FIG. 4C. and moves to the mounting position where the reel stand 21 is engaged. At this time, the tape cassette 31 and the cylinder 24 come close to each other, and the cylinder 24 relatively enters the bottom opening 36 of the tape cassette 31. Simultaneously with this movement of the cassette holder 41, the tape pull-out post 25 inserted into the bottom opening 36 of the tape cassette 31 at the temporary attachment position moves to pull out the tape, and the pulled-out magnetic tape 37 is wound around the cylinder 24. Can be attached. Then, signals are recorded and reproduced on the magnetic tape 37 wound around the cylinder 24.

Next, the operation when taking out the cassette will be explained. When removing a cassette, the movement is the opposite of when inserting a cassette.

That is, when the eject switch (not shown) is pressed, the mounting motor (not shown) rotates in the opposite direction to the direction during mounting, and the tape drawer boss 25 is returned to the bottom opening 36 of the tape cassette 31, and the arm 83 The synchronous axis 85
Rotate it clockwise. As a result, the cassette holder 41 moves from the mounting position shown in FIG. 4C to the temporary mounting position shown in FIG.
At the position where the lock is released, the magnetic tape 37 is still pulled out, and the magnetic tape 37 is wound around the cylinder 24, and it is necessary to wind the magnetic tape 37 while moving it to the temporary mounting position. This tape winding is performed by rotating the winding drive lever 79 from the middle of rotation of the arm 83, thereby sliding the tape winding slider 71 and reeling the reel 3.
This is achieved by rotating 4. Although this tape winding was not mentioned in the mounting operation, the magnetic tape 37 is loosened during mounting. There is no problem in loosening the magnetic tape 37, considering that the tape is also wound around the cylinder 24 during the cassette mounting operation.

When the arm 83 rotates to the temporary mounting position, the mounting motor (not shown) stops rotating and the arm 83 is locked. At the same time, a release rod (not shown) is released from the locking member 61.
The lock member 61 is rotated counterclockwise. As a result, the lock by the lock member 61 is released, and the lid release lever 49 is rotated counterclockwise relative to the cassette holder 41 by the action of the torsion spring 53, and the lid 32 is closed, and the lock release member 56 is rotated. The lever 34 is also rotated clockwise to lock it. Further, the guide bin 52 moves to a position where it comes into contact with the right end of the guide groove 48 shown in FIG. 1, and the entire cassette holder 41 rises to the cassette attachment/detachment position shown in FIG. 4a.

In the embodiment, the cassette holder 41 is maintained at the cassette attachment/detachment position by the torsion spring 53 rotating and biasing the lid release lever 49 counterclockwise. The biasing method can be changed to various methods. In addition, it is assumed that the guide bin 52 protruding from the cassette holder 41 moves within the horizontal guide groove 48 provided on the support side plate 47.
Of course, the shape of the guide pin 8 can be modified in various ways, and the relationship between the guide bin 52 and the guide groove 48 may be reversed. moreover,
Although it is assumed that the lid opening lever 49 rotates to open the lid 32, it is possible to move it in various ways other than rotation, since it is only necessary to achieve the purpose of opening the lid.

Effects of the Invention As described above, the present invention includes a chassis in which a cylinder, a tape draw-out post, and a reel stand are arranged, a cassette holder that holds a tape cassette, and a front part of the cassette holder to which the tape cassette can be attached and detached. cassette holder biasing means that biases the cassette holder upward, and cassette holder support means that rotatably supports a support portion provided at the rear of the cassette holder, and the front portion of the cassette holder is When the cassette holder is rotated about the supporting part by pushing down against the force means, the magnetic tape stretched over the front surface of the tape cassette is not engaged with the reel of the tape cassette and the reel stand. After the tape cassette is inserted into the cassette holder, the magnetic tape is inserted between the cylinder and the tape pull-out post by rotating the cassette holder, so that the reel and the reel stand do not engage with each other. is inserted between the cylinder and the tape draw-out post, and the tape can be pulled out from that position, so the cylinder is inserted relative to the bottom opening of the tape cassette as a path to guide the tape cassette to the position where the reel and reel stand engage. This allows a route to insert the . As a result, in order to bring the cylinder and tape cassette close to each other, there is no need to separate the chassis on which the cylinder and reel stand are arranged and move the two chassis relative to each other, so that only one chassis is required. Since only one chassis is required, the tape cassette and cylinder can be made close to each other at the cassette mounting position and the tape cassette can be made thinner, so that the VCH can be made smaller. Furthermore, the advantage of using only one chassis is that all the parts related to tape transport are mounted on the same chassis, improving the positional accuracy between the parts. As a result, it is also possible to obtain the effect that the quality of the recording/reproduction signal is improved.

Further, a chassis in which a cylinder is arranged, a cassette holder that holds a tape cassette, and a cassette holder guide means that supports a front part of the cassette holder and slides the cassette holder in a direction toward and away from the cylinder; By including a cassette holder moving means for rotating the rear part of the cassette holder with respect to the chassis, the cassette holder moves in a direction approaching the cylinder as a path for the cassette holder to a cassette mounting position where a reel and a reel stand engage. A path for relatively inserting the cylinder into the bottom opening of the tape cassette can be easily realized with a simple configuration by performing the two operations of moving and lowering at the same time.

Furthermore, a cassette holder that holds the tape cassette;
By including a lid opening means for opening the lid of the tape cassette and a locking means disposed on the cassette holder for locking the lid opening means, the lid can be opened in a state where the reel and the reel stand are not engaged. By locking the position of the lid opening means relative to the cassette holder at the position where the lid is opened, the lid can be easily maintained in an open state even if the cassette holder moves from the position where the lid is opened. . Therefore, the cassette holder can be moved even after the lid is opened.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a VCR according to an embodiment of the present invention at the cassette attachment/detachment position, FIG. 2 is a perspective view of the lid opening mechanism and reel lock release mechanism, FIG. 3 is a perspective view of the tape winding mechanism, and FIG. 4 5 is a side view explaining the cassette mounting operation by the VCR in the same embodiment, and FIG.
FIG. 6 is a side view illustrating the cassette mounting operation using a conventional VCH, and FIG.
The figure is a perspective view of the tape cassette used. 21... Reel stand, 24... Cylinder, 2
5...Tape drawer post, 31...Tape cassette, 41...Cassette holder, 46...
Chassis, 47... Support side plate, 49... Lid release lever, 53... Torsion spring, 61
...Lock member, 83...Arm. Name of agent: Patent attorney Akira Okaji and 2 others Naomon ÷ 1
Figure 5 Figure 6

Claims (3)

[Claims] (1) A chassis in which a cylinder, a tape drawer post, and a reel stand are arranged, a cassette holder that holds a tape cassette, and a cassette that urges the front part of the cassette holder upward so that the tape cassette can be attached and detached. The operation includes a holder biasing means and a cassette holder supporting means that rotatably supports a support section provided at the rear of the cassette holder, and an operation of pushing down the front part of the cassette holder against the cassette holder biasing means. Then, the cassette holder rotates about the support part, and the magnetic tape stretched over the front surface of the tape cassette is moved between the cylinder and the tape draw-out post in a state where the reel of the tape cassette and the reel stand are not engaged. A magnetic recording/reproducing device inserted between the (2) a chassis on which a cylinder is arranged, a cassette holder that holds a tape cassette, and a cassette holder guide means that supports the front part of the cassette holder and slides the cassette holder in a direction toward and away from the cylinder; , a cassette holder moving means for rotating a rear part of the cassette holder with respect to the chassis. (3) A magnetic recording and reproducing device comprising: a cassette holder for holding a tape cassette; a lid opening means for opening the lid of the tape cassette; and a locking means disposed on the cassette holder for locking the lid opening means.