JP2911319B2 - Synchronization mechanism for elevating the cassette holder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevating / lowering synchronous mechanism for always moving a cassette holder up and down in a substantially horizontal state in a magnetic recording / reproducing apparatus in which a cassette holder for holding a cassette case is supported on a slide chassis so as to be able to move up and down.

[0002]

2. Description of the Related Art Among magnetic recording / reproducing apparatuses, there is a so-called 8-mm video as an apparatus using a magnetic tape. This 8
In millimeter video, a slide chassis can store and hold a cassette case around which a magnetic tape is wound.
The slide chassis can be moved to the eject position where the cassette holder protrudes outward from the video main body by the built-in elevating mechanism to insert and remove the cassette case, and can be moved to the play position by the slide mechanism inside the video main body. At this play position, the magnetic tape in the cassette case can be pulled out and run to perform recording or reproduction.

[0003] The cassette holder is moved up and down with respect to the slide chassis by means of elevating mechanisms provided on both sides of the cassette holder, with the plate surface of the cassette case moving in parallel.

[0004]

The cassette holder is moved up and down while being maintained in a substantially parallel state by elevating mechanisms provided on both sides. For this reason, when the force is biased to one of the elevating mechanisms, the cassette holder is not moved up and down substantially in parallel, and the mounting of the cassette may be uncertain.

[0005]

According to the present invention, there is provided a cassette holder for holding a box-shaped cassette case on which a magnetic tape is wound, and wherein the plate surface of the cassette case is moved in parallel. The magnetic recording / reproducing apparatus has a slide chassis slidably provided on the main body of the magnetic recording / reproducing apparatus so that the cassette holder can be moved up and down in a state in which the cassette holder is moved, and an elevating mechanism provided over the cassette holder and the slide chassis on both sides of the cassette holder in the elevating direction. In the magnetic recording / reproducing apparatus, the lifting mechanism includes two arms that are rotatable relative to each other at an intermediate portion. One end of each arm is pivotally supported by the cassette holder and the other end is pivotally supported by the slide chassis . Also, one end or the other end of each arm is aligned with the slot.
Slide along the long hole.
A rack is provided at one end or the other end of one of the arms configured to be movable, and a pinion that meshes with the rack is provided.On the other hand, one connecting rod is rotatably supported by the cassette holder, and pinions are provided at both ends of the connecting rod. Is attached.

[0006]

The cassette holder is moved up and down by rotating two arms of the elevating mechanism. When the arm rotates, the connecting rod rotates via the rack and the pinion, the arms on both sides of the cassette holder synchronize with each other, and both lifting mechanisms operate at substantially the same speed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnetic recording / reproducing apparatus provided with a cassette holder elevating / lowering mechanism according to the present invention will be described.

FIG. 1 is a perspective view of a cassette case housing, FIG. 2 is a perspective view of a slide chassis, FIG. 3 is a perspective view of a cassette holder, FIG. 4 is a plan view of the cassette case housing, and FIG. 4 is the elevation position in FIG. 4, FIG. 6 is the cassette case in the lowered position in FIG. 4, and FIG. 7 is the cassette case in the raised position.
FIG. 8 is a view taken in the direction of the arrow VII in FIG. 8, FIG. 8 is a view taken in the direction of the arrow VII in FIG.
FIG. 11 shows the positional relationship between the cassette case and the rotary head drum.

In this embodiment, an explanation will be given using an 8 mm video as a magnetic recording / reproducing apparatus equipped with a drive mechanism for a reel brake. In addition, the cassette holder can protrude outward from the video main body by the elevating mechanism, and the 8 mm video can be slid to the play position with respect to the base chassis of the video main body by being supported by the slide chassis. . In this embodiment, the front or the front is the side where the cassette case is inserted into the cassette holder, and the rear or the rear is the opposite.

In the drawings, various members relating to driving of the magnetic tape mounted on the slide chassis are omitted.

As shown in FIG. 1, a magnetic tape 1 is housed in a box-shaped cassette case 2 wound around a supply reel 3 and a take-up reel 4. The magnetic tape 1 is exposed by opening the front lid 5 upward, and loading is possible.

As shown in FIGS. 1 to 5 and 7, the cassette holder 11 has a box-like shape with front and rear openings, and the cassette case 11 is opened from the front (left in FIG. 5, right in FIG. 7) opening. 2 is inserted. The slide chassis 15 has a box shape with an open top, and the cassette holder 11 has a slide chassis 15 in a state where the plate surface of the cassette case 2 is horizontally moved by lifting mechanisms 16 and 17 provided on both left and right sides (both sides in the lifting direction). Can be moved up and down freely.

Support portions 13 and 14 for supporting the cassette case 2 are formed at lower portions on both sides of the cassette holder 11, and a front portion (insertion opening) of the support portion 14 is a tip portion 102. At the tip of the tip 102, a corner 1 facing the outside of the opening
02a is formed, and the insertion of the cassette case 2 is guided by the distal end portion 102.

The supporting portions 13 and 14 are made of aluminum, and the tip portion 102 including the corner portion 102a of the tip portion 14 is made of stainless steel as a structure having higher strength than aluminum. The distal end portion 102 is swaged and fixed to the support portion 14, and the support portion 14 and the distal end portion 102 constitute a guide member 202.

Therefore, the distal end portion 102 of the support portion 14 maintains high rigidity, and the plate thickness does not increase. For this reason, the supporting portion 14 is not deformed when the cassette case 2 is inserted, and the increase in weight is smaller than when a reinforcing plate or the like is attached.

At the rear of the cassette holder 11 (the rear end of the insertion of the cassette case 2), the inserted cassette case 2 is inserted.
Is provided. The stopper 12 is formed by drawing and bending the rear end of the support portion 13.

Since the stopper 12 is formed on the support portion 13 by drawing and bending, the strength is dramatically improved without increasing the weight. Therefore, even if the cassette case 2 is repeatedly brought into contact with the stopper 12, the stopper 12 is not deformed, so that reliable positioning can always be performed.

Referring to FIGS. 5 and 6, the lifting mechanism 1 on one side will be described.
6 will be described.

As shown in the figure, a pair of arms 19, 20
Are rotatably connected to each other via a connection shaft 18 at an intermediate portion, and the front ends of the arms 19, 20, that is, one end of the arm 19, are pivotally supported by the cassette holder 11 by a pivot 21, and the other ends of the arms 20. The end is pivotally supported on the slide chassis 15 by a pivot 22. In addition, each arm 19,
The rear end side of the arm 20, that is, the other end of the arm 19 is pivotally supported by the slide chassis 15 by the elongated hole 23 and the support shaft 25, and one end of the arm 20 is pivotally supported by the elongated hole 24 and the support shaft 26 by the cassette holder 11. Have been. Arm 1
The upper side of the connecting shafts 18 of 9, 9 is a spring 27.
(Tensile springs), and the arms 19 and 20 are urged in the rising direction by the tensile force of the spring 27.

The lifting mechanism on the other side will be described with reference to FIGS.

As shown in the figure, a pair of arms 29, 30
Are rotatably connected to each other via a connection shaft 28 at an intermediate portion. The front ends of the arms 29, 30, that is, one end of the arm 29 are pivotally supported by the cassette holder 11 by a pivot 31, and The end is pivotally supported on the slide chassis 15 by a pivot 32. In addition, each arm 29,
The rear end of the arm 30, that is, the other end of the arm 29 is pivotally supported by the slide chassis 15 by the elongated hole 33 and the support shaft 35, and one end of the arm 30 is pivotally supported by the cassette holder 11 by the elongated hole 34 and the support shaft 36. Have been. Arm 2
The upper sides of the connecting shafts 28 of 9, 30 are connected by springs 37.
(Tension springs), and the arms 29 and 30 are urged in the rising direction by the tension force of the spring 37.

The arms 19, 2 of the lifting mechanisms 16, 17
As shown in FIGS. 5 to 8, the cassette holder 11 moves up and down while keeping the horizontal substantially as shown in FIGS.

The lifting / lowering synchronization mechanism of the present invention operates at substantially the same speed. The lifting / lowering synchronization mechanism of the present invention will be described.

As shown in FIGS. 5 to 8, the lifting mechanism 1
Racks 38 and 39 are formed at the upper ends of the arms 20 and 30 of the arms 6 and 17, respectively. As shown in FIGS. 1, 3 and 4 to 9, pinions 40 and 41 are rotatably mounted on the rear side of the cassette holder 11, and the pinion 40 meshes with the rack 38 of the arm 20 and the pinion 40 41 is engaged with the rack 39 of the arm 30. One connecting rod 42 is rotatably supported by the cassette holder 11, and pinions 4 are provided at both ends of the connecting rod 42.
0 and 41 are respectively attached. Pinion 40,
41 is integrally rotated by a connecting rod 42.

Therefore, when the cassette holder 11 is moved up and down horizontally by the elevating mechanisms 16 and 17, when the arms 20 and 30 are rotated, the pinions 40 and 41 are rotated via the racks 38 and 39, respectively. Since 41 is connected by the connecting rod 42, it rotates in synchronization with each other and the left and right lifting mechanisms 16, 17 operate at substantially the same speed. Then, the arm 2 of the lifting mechanism 16, 17
The rear ends of the racks 0 and 30, that is, the sides on which the racks 38 and 39 are formed are connected to the cassette holder 11 by the slots 24 and 34 and the support shafts 26 and 36, so that the rack 3
8 and 39 are pinions 4 while sliding with rotation.
0, 41 is rotated at an increased speed. For this reason, the lifting mechanism 16,
17 are different, that is, the cassette holder 1
Even when a force is applied to only one side of the cassette holder 1 and pushed in, the lifting mechanisms 16 and 17 operate reliably and synchronously, and the cassette holder 11 is raised and lowered.

As described above, the left and right lifting mechanisms 1
Springs 27 and 37 are stretched over the arms 19 and 20 and the arms 29 and 30 of the cassette holder 11 and the cassette holder 11.
Is raised by the urging of the springs 27 and 37. Since the urging forces of the springs 27 and 37 are forces that can raise the cassette holder 11, impacts and vibrations occur at the rising end of the cassette holder 11. A damper mechanism 43 is provided as a shock-absorbing member for reducing the impact and vibration to stop the cassette holder 11 gently.

The damper mechanism 43 will be described.

As shown in FIGS. 2, 7 and 8, in the slide chassis 15, a rack 4 is provided at the upper part on the rear side of the lifting mechanism 17 (the rear side of the cassette holder 11).
A slide member 45 made of resin is provided as a connecting member on which 4 is formed. The slide member 45 is supported movably back and forth (left and right in FIGS. 7 and 8), and one end of the slide member 45 is pivotally supported (coupled) to the rear end of the arm 29.

An oil damper 47 is mounted inside the slide chassis 15, and a pinion 46 made of resin is mounted on a rotating portion of the oil damper 47. Pinion 46
The rack 44 of the slide member 45 is meshed with the gear, and the movement of the slide member 45 is moderated by the oil damper 47.

When the cassette holder 11 is lifted by the lifting mechanism 17, the arm 2 is biased by the spring 37.
9 and 30 rotate in the direction in which they stand. At this time, the rear end of the arm 29 moves forward together with the slide member 45,
The pinion 46 is rotated via the rack 44. By the action of the oil damper 47, the pinion 46 rotates gently and the movement of the slide member 45 becomes gentle, and the cassette holder 11 stops gently without impact and vibration at the rising end.

Since the damper mechanism 43 is provided on the slide chassis 15 behind the elevating mechanism 17, there is no need to increase the size of the cassette holder 11 and to increase the width of the slide chassis 15. Further, since the arm 29 of the elevating mechanism 17 and the pinion 46 of the oil damper 47 are connected via the slide member 45, the pinion 46
Since the tooth width of the gear 44 and the rack 44 can be made large, the viscosity of the oil damper increases, and there is no possibility that the pinion 46 and the rack 44 will be damaged even when a large force is applied. Thus, the weight and cost can be reduced.

On the other hand, the elevating mechanism 17 has arms 29, 30
Is held in a tilted state, that is, a lock mechanism 48 for holding the cassette holder 11 in a lowered state.

The lock mechanism 48 will be described.

As shown in FIGS. 7 and 8, a hook 50 is rotatably mounted on a side of the slide chassis 15 on the side of the elevating mechanism 17 by a shaft 49, and is stretched between the slide chassis 15 and the hook 50. It is urged counterclockwise by a spring 51. Also hook 5
The restricting plate 53 is rotatably mounted by a shaft 52 adjacent to the shaft 0 and is urged in a counterclockwise direction by a spring 54, and the distal end of the restricting plate 53 abuts on the hook 50. It is held at the release position (the position shown in FIG. 7) by rotating against the urging force. On the other hand, a downwardly extending portion is formed integrally with the arm 30, and a locking pin 55 is fixed to this extending portion. Further, a projection 56 is integrally formed at the lower portion of the hook 50, and a release lever 105 is formed at the base chassis 71 that slidably supports the slide chassis 15.

Therefore, when the cassette holder 11 shown in FIG. 7 is lowered from the raised position (the arms 29 and 30 are upright positions), the arms 29 and 30 are tilted and the locking pins 55 are moved.
Descends. Then, the locking pin 55 comes into contact with the regulating plate 53 and pushes down against the urging force of the spring 54, and the hook 5 held at the release position by the regulating plate 53.
0 rotates counterclockwise by the urging force of the spring 51. Therefore, as shown in FIG. 8, the hook 50 is engaged with the locking pin 55 to prevent the arm 30 from rising, and the cassette holder 11 is restrained at the lowered position (the arms 29 and 30 are tilted). On the other hand, when the protrusion 56 of the hook 50 comes into contact with the release lever 105 of the base chassis 71, the hook 50 rotates counterclockwise against the urging force of the spring 51 and engages with the locking pin 55. Is canceled. Then, the arms 29 and 30 are erected by the urging force of the spring 37, and the cassette holder 11 is raised.

In FIGS. 5 to 8, 57, 58
Reference numeral denotes a detection switch for detecting a tilted state of each of the arm arms 19, 20, and 29, 30 of the elevating mechanisms 16, 17, ie, a lowered state of the cassette holder 11.

As shown in FIGS. 4 and 9, the cassette holder 11 of this embodiment is provided with a tape protector 61. When the cassette holder 11 (cassette case 2) is lowered, the lid 5 of the cassette case 2 is opened with this movement. At this time, the magnetic tape 1 may adhere to the back side of the lid 5 due to static electricity. However, the magnetic tape 1 rides on the rotating head drum and is carried to the opposite side, so that the magnetic tape 1 cannot be loaded properly. The tape protector 61 prevents the magnetic tape 1 from running on the rotating head drum.

A rotating member 63 is attached to the cassette holder 11 by a pivot 62 at the rear of the side of the lifting mechanism 17 side.
4 and 65 are integrally formed, and the rear end of the arm 29 of the elevating mechanism 17 can abut on one of the projecting pieces 64.
An operating member 6 having an L-shape adjacent to the rotating member 63
6 is rotatably supported by a shaft 67, and one end of the operating member 66 extending downward is connected to one of the protrusions 6 of the rotating member 63.
A long hole 68 is formed at the other end that can be brought into contact with the horizontal line 5 and extends horizontally. At the rear of the cassette holder 11, one end of the tape protector 61 is rotatably mounted by a pivot 69 at a position deviated from the center by a predetermined amount toward the lifting mechanism 17 (right side in FIG. 9). A connecting pin 70 is fixed at a position closer to the other end side from the pivot 69 of 61, and the connecting pin 70 is engaged with a long hole 68 of the operating member 66.

Therefore, when the cassette holder 11 holding the cassette case 2 is in the raised position, the position shown in FIGS.
As shown in FIG. 0, the lid 5 of the cassette case 2 is closed, while the tape protector 61 faces downward at a predetermined angle θ, and the leading end of the tape protector 61 has a rotating head drum 112 mounted on the base chassis 71. And is located substantially at the center in the radial direction.

When the cassette holder 11 is lowered from this state, as shown in FIGS. 9 and 11, the lid 5 of the cassette case 2 is opened by a release mechanism (not shown), and the magnetic tape 1 is exposed. On the other hand, the arms 29, 3 of the lifting mechanism 17
0 is tilted, and the rear end of the arm 29 abuts on the projecting piece 64 of the rotating member 63 to gradually rotate it in the counterclockwise direction in FIG. Then, the protruding piece 65 of the rotating member 63 comes into contact with one end of the operating member 66 to operate (up) the other end, and as the cassette holder 11 is lowered, the tape protector 61 is rotated upward. The lifting operation of the tape protector 61 is performed with a delay with respect to the opening operation of the lid 5 of the cassette case 2, and the tape protector 61 causes the magnetic tape 1 exposed from the cassette case 2 to move on the outer peripheral surface of the rotary head drum 112. The ascent ends immediately before facing.

When the cassette case 2 is mounted in the 8 mm video main body, as shown in FIG. 1, the cassette case 2 is inserted into the cassette holder 11 at the raised position from the front. Then, when the cassette holder 11 is pushed down from above from the eject (up) position shown in FIGS. 5 and 7, the arms 19, 20 and 2 of the elevating mechanisms 16 and 17 are moved.
The cassette holders 9 containing the cassette case 2 move to the lowered position. At this time, the cassette holder 11 (cassette case 2) can be lowered while keeping the horizontal state, and the arms 20, 30 in the left and right elevating mechanisms 16, 17 operate by the racks 38, 39 and the pinions 40, 41. The right and left elevating mechanisms 16 and 17 operate in synchronization with each other by the connecting rod 42, so that the cassette holder 11 is prevented from being twisted or inclined at the time of its lowering.

As shown in FIGS. 6, 8 and 9, when the cassette holder 11 is lowered, the cassette holder 11 is restrained by the lock mechanism 48 at the lowered position. That is, when the arms 29 and 30 of the elevating mechanism 17 tilt, the locking pin 5
The hooks 50 are engaged with the locking pins 55. Therefore, the arm 30 is prevented from standing up, and the cassette holder 11 is restrained at the lowered position. Then, the detection switches 57 and 58 detect the movement of the cassette holder 11 to the lowered position.

When the cassette holder 11 is at the raised position, as shown in FIGS. 9 and 10, the lid 5 of the cassette case 2 is closed, and the tip of the tape protector 61 is outside the rotary head drum 112. It is located on the periphery and almost at the center in the radial direction. Then, the cassette holder 1
When the cartridge 1 is lowered, the lid 5 of the cassette case 2 is opened to expose the magnetic tape 1 as shown in FIGS.
On the other hand, as the cassette holder 11 is lowered, the tape protector 61 is rotated upward. At this time, the lifting operation of the tape protector 61 is performed with a delay from the opening operation of the lid 5 of the cassette case 2, and the magnetic tape 1 exposed from the cassette case 2 is moved from the cassette holder 11 facing the outer peripheral surface of the rotary head drum 112. In the lowered position, the tape protector 61 moves up to a horizontal position.

Accordingly, when the cassette holder 11 (cassette case 2) is lowered, even if the magnetic tape 1 adheres to the back side of the cover 5 due to static electricity accompanying the opening of the cover 5 of the cassette case 2, Tape 1 and rotating drum head 11
Since the tape protector 61 is positioned between the magnetic tape 1 and the magnetic tape 2, the magnetic tape 1 is prevented from running on the rotary head drum 112.

When the cassette holder 11 is completely lowered and restrained at that position by the lock mechanism 48, the slide chassis 15 is moved to the play position by the drive mechanism (not shown), and the cassette case 2 is loaded. At the play position, the magnetic tape 1 in the cassette case 2 is pulled out and run to perform recording or reproduction.

When the recording or reproduction of the magnetic tape 1 is completed and the running is stopped, the loading of the cassette case 2 is released, and the slide chassis 15 moves to the original position (ejection position). When the slide chassis 15 moves to the eject position, as shown in FIGS. 6 and 8, the protrusion 56 of the hook 50 comes into contact with the release lever 105 of the base chassis 71, and the hook 50 resists the urging force of the spring 51. To rotate in the counterclockwise direction so that the locking pin 5
5 is disengaged. Then, the arms 29 and 30 of the elevating mechanism 17 are erected by the urging force of the spring 37, and the arms 19 and 20 of the elevating mechanism 16 are also erected by the urging force of the spring 27, and the cassette holder 11 is raised.

When the cassette holder 11 is raised by the lifting mechanisms 16 and 17, the cassette holder 11 is raised by the urging force of the springs 27 and 37, but when the arm 29 is raised, the rear end moves forward together with the slide member 45. By rotating the pinion 46 through the rack 44, the pinion 4 is rotated by the action of the oil damper 47.
6, the rotation of the cassette holder 11 becomes gentle, the shock and vibration at the rising end of the cassette holder 11 are reduced, and the cassette holder 11 stops gently.
After the cassette holder 11 is raised, the cassette holder 11
Take out the cassette case 2 from inside.

In the above-described elevating and lowering synchronization mechanism of the cassette holder 11, the racks 38,
The pinions 40 and 41 rotate through the respective 39, the pinions 40 and 41 rotate in synchronization with the connecting rod 42, and the left and right elevating mechanisms 16 and 17 operate at substantially the same speed. For this reason, the cassette holder 11 is not twisted or inclined at the time of elevating. Further, since the racks 38 and 39 rotate the pinions 40 and 41 while sliding along with the rotation, the rotation of the pinions 40 and 41 is increased. For this reason, the synchronization of the lifting mechanisms 16 and 17 is ensured, and the cassette holder 11 is raised and lowered in a state where it is always kept substantially horizontal.

[0049]

According to the present invention, there is provided a cassette holder lifting / lowering synchronizing mechanism which is attached to both ends of one connecting rod in a magnetic recording / reproducing apparatus in which a cassette holder is supported by two lifting / lowering mechanisms so as to be movable up and down with respect to a slide chassis. Of the cassette holder is moved by rotation of the two arms of the lifting mechanism, and the connecting rod is moved through the rack and the pinion by the rotation of the arm. Then, the arms of the two lifting mechanisms rotate synchronously at substantially the same speed.
As a result, the cassette holder does not become twisted or inclined at the time of elevating and is always moved up and down while being kept substantially horizontal.

[Brief description of the drawings]

FIG. 1 is a perspective view of a cassette case storage unit.

FIG. 2 is a perspective view of a slide chassis.

FIG. 3 is a perspective view of a cassette holder.

FIG. 4 is a plan view of a cassette case storage unit.

FIG. 5 is a view taken in the direction of the arrow V in FIG. 4 in which the cassette case is at a raised position.

FIG. 6 is a view taken in the direction of the arrow V in FIG. 4 with the cassette case in a lowered position.

FIG. 7 is a VII in FIG. 4 with the cassette case in the raised position;
Arrow view.

FIG. 8 is a VII in FIG. 4 with the cassette case in a lowered position;
Arrow view.

FIG. 9 is a view taken in the direction of the arrow IX in FIG. 4;

FIG. 10 is an explanatory diagram showing a positional relationship between a cassette case and a rotary head drum.

FIG. 11 is an explanatory diagram showing a positional relationship between a cassette case and a rotary head drum.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic tape 2 Cassette case 3 Supply reel 4 Take-up reel 11 Cassette holder 12 Stopper 13,14 Support part 16,17 Elevating mechanism 19,20,29,30 Arm 38,39 Rack 40,41 Pinion 42 Connecting rod 43 Damper mechanism 44 Rack 45 Slide member 46 Pinion 47 Oil damper 48 Lock mechanism 102 Tip 102a Corner

Claims (1)

(57) [Claims] 1. A cassette holder in which a box-shaped cassette case on which a magnetic tape is wound is housed and held, and a cassette holder which is vertically movable while the plate surface of the cassette case moves parallel to the main body of the magnetic recording / reproducing apparatus. In a magnetic recording / reproducing apparatus including a slide chassis slidably provided and elevating mechanisms provided over the cassette holder and the slide chassis on both sides of the cassette holder in the elevating direction, the elevating mechanisms rotate relative to each other at an intermediate portion. It has two arms which can be freely adjusted, one end of each arm is pivotally supported by the cassette holder and the other end is pivotally supported by the slide chassis , and one end or the other end of each arm extends along the long hole.
It is configured to be slidable and slides along the long hole.
A rack is provided at one end or the other end of one arm configured to be movable, and a pinion that meshes with the rack is provided.On the other hand, one connecting rod is rotatably supported on the cassette holder, and pinions are provided at both ends of the connecting rod. Synchronizing mechanism for raising and lowering the cassette holder, each of which is attached.