JP4227270B2 - Recording or playback device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a recording or playback device, and more particularly to a recorder deck of a video camera.
[0002]
[Prior art]
In a VTR (video tape recorder), a guide post on which a tape travels needs to be accurately positioned.
[0003]
For this reason, this type of guide member having a tape guide post is manufactured with high accuracy, and the guide post needs to be assembled there with higher accuracy.
[0004]
[Problems to be solved by the invention]
However, in this type of conventional example, in order to manufacture the guide member with high accuracy, an aluminum die-cast blank is cut to increase the accuracy of the positioning portion of the guide member, and an assembly hole portion for assembling the guide post is further provided. In order to guarantee the accuracy of the guide post by processing with a high-precision processing machine, the guide member has been relatively expensive.
[0005]
In addition, there is also a method of fixing the bush by which the guide post is assembled to the guide member in a state where it is fixed accurately with a jig without machining, but it takes a considerable amount of time to cure the adhesive. There was a problem that the production quantity was limited.
[0006]
Furthermore, the assembled guide post also has a tilting variation due to variations in the processing of the positioning portion of the guide member, and the 5-7 μm-thick vapor deposition tape used in normal digital video is defective. There are problems that occur or cause a head touch failure.
[0007]
The present invention has been made in view of the above situation, and an object thereof is to provide means for preventing the occurrence of these defective products.
[0008]
[Means for Solving the Problems]
Therefore, in the present invention, the object is achieved by providing a magnetic recording / reproducing apparatus according to any one of the following items (1) to ( 5 ).
[0011]
( 1 ) In an apparatus for performing recording and reproduction by drawing a tape in a cassette and winding it around a drum, a guide post for pulling out the tape, and a guide member integrally formed with a bush having a hole for fitting with a shaft portion of the guide post And a positioning member for positioning the guide member in the tape pulled out state, the bush has a flange portion and a conical taper portion at a position facing the flange portion, and the flange portion of the bush in the tape pulled out state The recording or reproducing apparatus according to claim 1, wherein the recording member is in contact with a positioning surface of the positioning member, and the conical taper portion is in contact with an edge portion formed on a back surface of the positioning surface.
[0012]
( 2 ) The recording or reproducing apparatus according to ( 1 ), wherein an edge portion of the positioning member is formed by a countersink portion.
[0013]
( 3 ) The recording or reproducing apparatus according to ( 2 ), wherein the edge portion has a V shape.
[0014]
( 4 ) The recording or reproducing apparatus according to ( 1 ), wherein the positioning surface is formed by an inclined surface.
[0015]
( 5 ) The recording or reproducing apparatus according to ( 4 ), wherein the positioning member is made of a plastic material.
[0016]
[Action]
With the above-described configuration of the present invention, by directly positioning the bush into which the guide post is fitted, the accuracy of the guide post to be tilted can be obtained regardless of the accuracy of the guide member.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below in detail with reference to the drawings based on one embodiment.
[0018]
【Example】
FIG. 1 is a diagram showing a positional relationship between a cassette and a drum guide post and a power transmission method of a reel driving mechanism in a recording / reproducing state according to an embodiment of the present invention:
(Constitution)
In FIG. 1, 1 is a main chassis, 2 is a rotating drum having a recording / reproducing head, 3 is rotatably arranged on the main chassis 1, and a capstan for transferring a tape, 39 is a cassette at a recording / reproducing position, 25 is a tension post for applying an appropriate tension to the tape, 38 is a supply-side main inclined post, 20 is a supply-side drum winding guide post that determines an inclination angle of winding of the tape around the rotating drum 2, and 21 is also a take. A take-up drum winding guide post 26 for determining the inclination angle of the up-side tape, and a take-up side pull-out post 26 for pulling out the tape from the cassette.
[0019]
28 is a supply-side reel base, 29 is a take-up side reel base, 33 is a first pulley formed coaxially with the capstan 3, 40 is a timing belt for transmitting the driving force of the capstan 3, and 41 is A roller for guiding the timing belt 40, 32 a second pulley to which the driving force from the first pulley 33 is transmitted via the timing belt 40, 30 a drive gear having a torque limiter, and 31 coaxial with the capstan 3 The first pulley 33, the timing belt 40, and the second pulley 32 are rotated to selectively mesh with the supply-side reel base 28 and the take-up side reel base 29 according to the rotation direction, thereby generating a driving force. An idler gear 18 for transmission is a pinch roller that is pressure-bonded to the capstan 3 with a tape interposed therebetween and that transfers the tape.
[0020]
FIG. 2 is a diagram showing a slide chassis 27 that is slidably supported relative to the main chassis 1 between the cassette loading position and the recording / reproducing position of the present embodiment.
[0021]
The tension post 25 and the take-up side pull-out post 26 are rotatably supported by the slide chassis 27 via a link mechanism. A supply side reel base 28 and a take-up side reel base 29 are pivotally supported by a slide chassis 27 so as to be rotatable.
[0022]
A cam portion 27 ′ formed on the slide chassis 27 engages with a pin 9 a of a slide lever 9 (FIG. 3) configured on the main chassis 1 side, which will be described later. This is for sliding back and forth.
[0023]
FIG. 3 is a perspective view of the mechanism configured on the main chassis 1 as seen through the top surface of the chassis 1:
4 is a loading motor, 5, 6 and 7 are gears for transmitting the rotation of the loading motor, 8 is a first cam gear, 9 is a pin 9a engaged with a cam portion 27 'of the slide chassis 27, The slide lever 10 that slides the gear 10a engages the gear portion 10a with a gear 22 ', which will be described later, and rotates it. 12, 13, 14 are relay gears, 15 is a second cam gear, and 16 is a brake drive. Lever, 17 represents a pinch drive lever, and 18 represents a pinch roller.
[0024]
FIG. 4 shows a state in which the tape guide posts 20 and 21 are located inside the cassette and the tape is pulled out to be in a first position where the tape can be loaded, and the outer periphery of the rotary drum 2 by pulling the tape out of the cassette. It is a figure which shows the drive mechanism which accumulated and displayed the state in the 2nd position which completed winding.
[0025]
Reference numeral 19 denotes a drum base that supports the drum 2 and has a positioning portion for positioning the guide post after the tape is pulled out. Reference numerals 20 'and 21' denote guide members to which the guide posts 20 and 21 are attached. And the guide rail 24 are engaged by a groove portion 22 ', 23' engaged with the gear portion of the loading lever 10 (FIG. 3) from the cassette loading position A to the recording / reproducing position B. .
[0026]
That is, the rotation of the loading lever 10 rotates the gears 22 ′ and 23 ′, and the guide members 20 ′ and 21 ′ move along the guide rails 24 via the link mechanisms attached to the respective gears. It is. The supply side main inclined post 38 is formed on the drum base 19.
[0027]
FIG. 5 is a perspective view of the main chassis 1 from above:
The main chassis 1 is made of a silicon steel plate, and an electric circuit pattern 43 is formed thereon. Reference numeral 34 denotes a drive coil of the capstan motor, 44 denotes a hall element, and 35, 36, and 37 denote various sensor elements.
[0028]
FIG. 6 shows the tape path of this embodiment.
[0029]
(Operation)
Next, the operation will be described with reference to FIGS.
When the cassette is loaded, the loading is detected, the loading motor 4 (FIG. 4) rotates in FIG. 3, and the first cam gear 8 rotates through the gears 5, 6, and 7. As the first cam gear 8 rotates, the slide lever 9 and the loading lever 10 rotate in the direction of the arrow in FIG. 2 is moved from the cassette loading position to the recording / reproducing position by the rotation of the slide lever 9 in the arrow direction.
[0030]
At this time, the tension post 25 and the take-up side pull-out post 26 in FIGS. 1 and 6 change from the inside of the mouse on the front of the cassette 39 due to the relative position change with the cam (not shown) formed on the main chassis 1 side. Move forward and pull the tape out of the cassette.
[0031]
As the loading lever 10 in FIG. 3 rotates, the gear portion formed on the loading lever 10 drives the gear portion of each guide member 22 ', 23' in FIG. The tape moved from the inside (position A) to the recording / reproducing position (position B) along the groove portion of the guide rail 24 and the groove portion of the drum base 19 and the tape stored in the cassette 39 is placed on the outer periphery (FIG. 1). Enables winding recording and playback.
[0032]
The guide posts 20 and 21 are fixed by a positioning portion of the drum base 19 (FIG. 4). Further, the power of the loading motor 4 is transmitted to the second cam gear 15 via the relay gears 12, 13, and 14 in FIG. 3. The pinch drive lever 17 is driven by the second cam gear 15, and the pinch roller 18 is pressed against or separated from the capstan 3.
[0033]
The tape drawn out from the cassette by the power of the loading motor 4 and wound around the drum 2 is fed by a capstan 3 and a pinch roller 18 formed on the main chassis 1. At that time, in FIG. 1, the rotational force of the capstan 3 is transmitted to the second pulley 32 via the timing belt 40 (FIG. 1).
[0034]
The rotational force of the second pulley 32 is transmitted to the take-up reel base 29 via the drive gear 30 and the idler 31, and the tape sent by the capstan 3 and the pinch roller 18 is cassette-taken by the take-up side reel base 29. 39 is wound inside.
[0035]
As shown in FIG. 6, the tape pull-out posts (tension post 25, supply side guide post 20, take-up side guide post 21, take-up side pull-out post 26) located in the cassette mouse when the cassette 39 is loaded are Then, the tape in the cassette 39 is pulled out and wound around the rotating drum 2 by the tape loading operation, and when loading is completed, a tape path as shown in the figure is formed. In this recordable / reproducible state, other drawer posts 25, 26, etc. are located on a line a connecting the center of the lower flange of the supply side guide post 20 and the upper flange center of the take-up side guide post 21. The a-axis is substantially parallel to the line connecting the center of the supply-side reel base 28 and the center of the take-up side reel base 29 and is positioned between the center of the drum 2 and the chassis end surface c. It is configured. At this time, the drum 2 is inclined in the direction of the third quadrant in the XY rectangular coordinate system when the a axis is the X axis and the right side is the plus.
[0036]
FIG. 7 is a side view showing the loading mechanism of the embodiment of the present invention.
[0037]
Supply side guide post 20 and take-up side post 21 are supported by supply-side guide member 20 'and take-up side guide member 21', respectively. Here, the supply side guide member 20 'and the take-up side guide member 21' are formed of the same member.
[0038]
FIG. 8 shows a state in which the supply side guide member 20 ′ is in the loading position. The guide member 20 ′ is brought into the loading position by abutting against the three projections 19 a, 19 b, 19 c for positioning the drum base 19. It is positioned. FIG. 9 shows a side view of FIG.
[0039]
A guide post 20 is fitted to the guide member 20 ′, has a thread portion for adjusting the height, and a bush 45 as a member for supporting the guide member 20 ′ is integrally formed. The bush 45 includes a hole portion into which the guide post 20 is fitted, a flange portion 45a that comes into contact with the protrusions 19a, 19b, and 19c for positioning the drum base 19, and a conical tapered portion at a position facing the flange portion. 45b, and the taper portion 45b abuts four edge portions of the guide groove portion of the drum base 19 in the positioning state, and the flange portion of the bush 45 of the guide member 20 'is connected to each protrusion portion 19a of the drum base 19. , 19b, 19c.
[0040]
Since the bush 45 is processed by a lathe process, the perpendicularity between the flange portion 45a and the guide post fitting portion can be obtained at low cost and with high accuracy. In this embodiment, the bush 45 is integrally formed with the guide base 20 'by caulking. Further, by adjusting the respective heights of the protruding portions of the drum base 19, the guide post 20 can be tilted to a predetermined level.
[0041]
FIG. 11 is a view showing the groove back side of the positioning portion of the guide member 20 ′ of the drum base 19.
[0042]
A V-shaped counterbore 46 is formed at the contact portion of the conical tapered portion of the bush 45 of the guide member 20 ′.
[0043]
FIG. 10 is a view showing a cross section of the counterbore 46.
[0044]
In the VTR, the positioning portions 19a to 19c of the guide members 20 'and 21' are often formed on inclined surfaces. In many cases, the drum base 19 is integrally formed with the positioning portions 19a to 19c by molding, and in this case, the groove portion is formed by a surface perpendicular to the chassis surface.
[0045]
At that time, if the groove is formed on the surface perpendicular to the edge portion that contacts the conical taper portion of the guide members 20 'and 21', the area of the protrusion 19a for contact of the flange portion 45a is reduced or the area is increased. In addition, it is necessary to increase the size of the ridge, but the contact portion can be increased by the length of l as shown in the figure by the counterbore 46.
[0046]
【The invention's effect】
As described above, according to the present invention, it is possible to provide the accuracy of the guide post falling down, and to provide an inexpensive device free from tape damage and head touch failure.
[0047]
In addition, since special processing (high-precision cutting, adhesion processing, etc.) is not required, there is an effect that the degree of freedom in processing parts is increased and the production quantity is easily secured.
[Brief description of the drawings]
FIG. 1 is a diagram showing a positional relationship between a cassette and a drum guide post and a reel driving mechanism in a recording / reproducing enabled state according to an embodiment. FIG. 2 is a diagram showing a slide chassis when the cassette is loaded and recording / reproducing is performed. [Fig. 3] Drive mechanism diagram on the main chassis of the embodiment [Fig. 4] Tape guide post drive mechanism diagram of the embodiment [Fig. 5] Main chassis of the embodiment [Fig. 6] Tape path of the embodiment [Fig. FIG. 8 is a side view of the supply side guide base. FIG. 9 is a side view of FIG. 8. FIG. 10 is a sectional view of the countersink portion. Diagram showing positioning part [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Main chassis 2 Drum 3 Capstan 4 Loading motor 5, 6, 7 Gear 8 1st cam gear 9 Slide lever 10 Loading lever 12, 13, 14 Relay gear 15 2nd cam gear 16 Brake drive lever 17 Pinch drive lever 18 Pinch roller 19 Drum base 19a, 19b, 19c Positioning protrusion 20 Supply side guide post 20 'Guide member 21 Take up side guide post 21' Guide member 24 Guide rail 25 Tension post 26 Take up side drawer post 27 Slide chassis 28 Supply side reel base 29 Take-up side reel base 30 Drive gear 31 Idler 32 Second pulley 33 First pulley 38 Main inclined post 39 Cassette 40 Timing belt 41 Roller 43 Electric circuit pattern 44 Hall Child 45 bush 46 seat facing portion

Claims (5)

  In an apparatus for recording and reproducing by winding a tape in a cassette around a drawing drum, a guide post for pulling out the tape, a guide member integrally formed with a bush having a hole for fitting with a shaft portion of the guide post, and the tape A positioning member for positioning the guide member in the pulled-out state; the bush has a flange portion and a conical taper portion at a position opposite to the flange portion; and the flange portion of the bush in the tape-drawing state is positioned in the positioning position The recording or reproducing apparatus according to claim 1, wherein the conical taper portion is in contact with a positioning surface of the member, and the conical taper portion is in contact with an edge portion formed on a back surface of the positioning surface. The edge portion of the positioning member, the recording or reproducing apparatus according to claim 1, characterized in that it is formed by a counterbore. 3. The recording or reproducing apparatus according to claim 2 , wherein the edge portion has a V shape. The positioning surface, recording or reproducing apparatus of claim 1, characterized in that formed in the inclined surface. 5. The recording or reproducing apparatus according to claim 4 , wherein the positioning member is made of a plastic material.

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