JPS6120267A - Rotary magnetic sheet device - Google Patents

Abstract

PURPOSE:To detect the content of display exactly by engaging a driving member and an engaging member keeping a small gap when the engaging member drives by engaging with a counter and making position control with the driving member energizing the engaging member backward by an elastic member when in separated state. CONSTITUTION:When a cam 35 is advanced by one tooth by energizing a solenoid 16, a lever 72 can be oscillated as the follower 73 of the lever 72 is in slide contact with outer periphery 74 of the cam 35, and with advance of the cam 35, the lever 72 rotates counterclockwise and moves a slider 76 resisting the energizing force of a spring 77. When supply of current to the solenoid 16 is cut off, the position of the cam 35 is determined by a stopper click 56, and at the same time, the position of the slider 76 is also determined. Even when a guide rail 83, out of guide rails 83, 84, changes in the direction 102, if the guide rail 84 is positioned at high accuracy, a head 79 moves only in the direction 103, and the change of height can be made very small. Thus, the content of display of the counter provided in a magnetic disk cassette can be detected exactly.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotating magnetic sheet device used, for example, in an electronic still camera system, for recording and reproducing video signals and the like on a rotating magnetic sheet.

Conventional configuration and its problems In magnetic disk cassettes for electronic still camera devices, the number of recording tracks recorded on the magnetic sheet is displayed inside the housing of the magnetic disk cassette so that the number of recording tracks recorded on the magnetic sheet can be visually confirmed. It has been proposed to provide additional counters.

The configuration of the magnetic disk cassette will be explained below. FIG. 1 shows a plan view of a magnetic disk cassette, in which 1 is a magnetic sheet, 2 is a center core provided at the center of the magnetic sheet 1, 2a is a spindle engagement hole provided in the center core 2, and a rack. scale to represent numbers,
3C and 3d are bosses formed inside the cassette housing 3; 4 is a protective shutter for protecting the magnetic disk 1 from dust when storing the magnetic disk cassette; and a magnetic sheet that rotates the magnetic disk cassette. When installing the device into the device, the protective shutter 4 is slid to open the insertion hole 3a as shown in FIG.

A counter 6 has a tooth-shaped outer periphery and an engagement hole 6a and a groove 5b in the center, and a scale 3b indicated by the groove 5b indicates the number of recorded trunks. A detailed cross-sectional view of the counter 5 is shown in FIG. Reference numeral 6 denotes a stopper made of an elastic material such as resin, which has a convex portion 6a in the center and engages with the tooth shape on the outer periphery of the counter 5, and is inserted into the cassette housing 3 through holes 6b and 6C provided at both ends. It is held by provided bosses 3C and 3d.

The number of recorded recording tracks of the magnetic disk cassette shown in FIGS. 1 and 2, that is, the scale 3b indicated by the groove 5b of the counter 6, is 0, indicating that the magnetic disk cassette is an unrecorded disk cassette. Now, when one track is recorded on the magnetic sheet 1 of this magnetic disk cassette, the counter 5 is rotated counterclockwise about the engagement hole 6a. At this time, the convex portion 6a of the stopper 6 is engaged with the tooth-shaped portion on the outer periphery of the counter 5, but since the stopper 6 is made of an elastic material, the rotational torque applied to the counter 6 exceeds a certain magnitude. Then, the tips of the tooth-shaped portions of the counter 6 push away the drawing portion of the strut 6, and the counter 5 rotates. ζWhen the rotational torque is removed after the counter 6 has rotated by approximately one tooth of the tooth tip shape, a force is acting on the stopper 6a to engage with the tooth profile of the counter 6 due to elastic force. The counter 6 is held after rotating by one tooth. Since the scale 3b is arranged according to the rotation angle of the counter 6, the groove 6b of the counter 6 points to the first scale, indicating that only one track has been recorded. From now on, the above operation is repeated every time recording is performed on the magnetic sheet 1. K represents the number of recorded trunks that are always being recorded.

If you want to record on a magnetic disk cassette that has been partially recorded, detect the number of tracks that have already been recorded, that is, the position of the groove 6b of the counter 6, and move the recording head to a predetermined position. All you have to do is record it.

However, in the magnetic disk cassette described above, the size of the cassette is compact, so the size of the counter 6 is only small, and the number of tracks that can be recorded on the magnetic sheet is relatively large, 50. Therefore, the amount of movement of the groove 5b of the counter 5 per scale is very small.

Therefore, when attempting to detect the recording track of the magnetic fan disk cassette, if there is any play in the detection means, it is impossible to accurately detect the recording track wave. In addition, in this type of rotating magnetic sheet device, in order to have a compact and simple configuration, the driving means for the counter 6 and the driving means for the head are not provided completely separately, but the counter 6 and the head are interlocked with each other. It is more advantageous to adopt a configuration in which the motor is driven by However, in such a configuration, the phases of each click position of the counter 6 and each stop position of the head must be perfectly aligned, and this adjustment is difficult, and the accuracy of the click position of the counter 6 is limited. Counter 5 affects the head position accuracy.
The problem was that it had to be highly accurate.

Purpose of the Invention The present invention solves the above-mentioned conventional problems, and provides a simple configuration that accurately detects the display contents of the counter provided on the magnetic disc hub and does not require difficult adjustments when driving the counter. The purpose of this invention is to provide a rotating magnetic sheet device that can be realized in the following manner.

Structure of the Invention The present invention uses a magnetic sheet rotatably housed in a cassette housing as a recording medium, and a counter that displays the number of tracks recorded on the magnetic sheet while being held by an elastic click means is disposed inside the housing. The rotating magnetic sheet device also includes a force capable of engaging and driving a counter, a counter engaging member, and a driving member that drives the counter engaging member in conjunction with a head. The mating member has a first position in which it engages with the counter and is driven against the elastic force of the elastic click means, and a second position in which it is spaced apart from the counter. The driving member is constructed so that the counter engaging member is biased backward from the front by an elastic member in the driving direction, and its position is restricted from the rear.By eliminating play in the counter engaging member, which serves as a means for detecting the counter display position, the counter display is realized. In the first position, the elastic member and the counter-engaging member are separated from each other, and the drive member and the counter-engaging member are engaged with each other with a small gap between the head and the head. It is more difficult to provide a slight play in the engagement between the driving member and the counter engaging member that are linked to movement, since it is not necessary to completely match the phases of each click position of the counter and each stop position of the head. This configuration requires no adjustment and can be configured simply.

DESCRIPTION OF EMBODIMENTS A drive system of a rotating magnetic sheet device showing an embodiment of the present invention will be described in detail with reference to FIGS. 4 to 12. FIG. First, in FIG. 4, a substrate 11 is made of, for example, aluminum die-casting, and is highly accurate and reliable. The spindle motor 12 is fixed to the substrate 11 by screws 13, 14, 15, ensuring its positional accuracy. 16 is a solenoid and screws 17.1B, 19.20
It is fixed to the substrate 11 via the mounting plate 21. The solenoid 16 attracts the iron core 22 and moves it in the direction of the arrow 23 when energized. The iron core 22 has a solenoid bottle 24
The drive lever 26 is engaged with the drive lever 26 through this operation, and the drive lever 26 can be rotated clockwise by this operation. The drive lever 25 is rotatable about a shaft 26 implanted in the base plate 11, and its range of rotation is defined by the opening 27 and the pin 28 also on the base plate 11'. Further, since a spring 30 is suspended between the drive lever 26 and the bottle 29 on the base plate 11, the drive lever 26 is always biased counterclockwise. Therefore, when the power to the solenoid 16 is cut off, the opening 27 comes into contact with the bottle 28 as shown in the figure, and at the same time the iron core 22 is separated from the solenoid 16. The drive lever 26 is provided with a shaft 31, and a drive claw 33 biased counterclockwise by a spring 32 is supported on the shaft 31. The drive pawl 33 is stopped in contact with a ratchet 34 as shown in the figure.

The following description will be made with reference to FIG. 6, FIG. 6, FIG. 7, FIG. 8, and FIG. 9 in addition to FIG. Cam 36 for ratchet 34
is a screw 36, and a driving member 37 is fixed to the cam 36 with a screw 38, making it integral. A hollow shaft 39 is fixed to the substrate 11 with a nut 40. A counter engaging member 41 is inserted into the inside of the shaft 39 together with a compression spring 42, and can slide up and down while being biased upward by the compression spring 42. A counter driving convex portion 41a is integrally formed on this counter engaging member 41, and a counter engaging switch 43 is provided on the lower side, and its lower position is regulated by a leaf piece 44. Further, the upper position is similarly regulated by a snap ring 46.

Further, the aforementioned cam 35 is rotatably held on the outside of the shaft 39.

Further, between the ratchet 34 and the substrate 11, the substrate 11
The mainspring 47 is guided around the upper guide section 46.
is applied, urging the ratchet 34 (including the integrated cam 36 and drive member 37) clockwise. Now, the counter driving convex portion 41a of the counter engaging member 41 is the convex portion A3ya of the driving member 37 and the convex portion Bs7b.
It is caught between. Also, the driving member 3
7 Nihabara springs 104 are attached by pins 105. When the counter engaging member 41 is raised, the spring 104 does not engage with the counter driving protrusion 41a as shown in FIG. It can move freely within the gap with part B57b. When the counter engaging member 41 is pressed down, the counter driving protrusion 41a is moved by the spring 104 to the driving member 3, as shown in FIG.
It will be in a state where it is pressed against the convex portion A of No.7. Now, as mentioned above, the counter 6 in the cassette housing 3 is provided with the engagement hole 5a and the groove 6b, into which the counter engagement member 41 is inserted into the device. If the phase of the groove 6b of the counter 6 and the phase of the counter driving protrusion 41a match, they fit into each other as shown in FIG. 5, and the rotation of the ratchet 34 can be transmitted to the counter 5. If this is not the case, the counter driving convex portion 41a is pushed down by the counter 5 as shown in FIG.
4. Touch 49 to turn on the switch. In this state, even if the ratchet 34 rotates, the counter 6 does not rotate, and the counter engagement member 41 is pushed up by the elasticity of the compression spring 42 at the position where the phase is present, and the counter engagement member 41 is pushed up by the elasticity of the compression spring 42, and the counter engagement switch 4
When the leaf pieces 44 and 49 of No. 3 come in contact with each other, the switch is turned off, and the counter driving convex portion 41a is brought into contact with the counter 6.
As shown in FIG. 6, the ratchet 34
The counter 6 can now be driven by the same rotation of . That is, depending on the rotation angle of the ratchet 34, the position of the head (described later), and the relationship with the counter 6 on the cassette side, the rear end of the recorded track can be freely detected. Now, in this case, the amount of change in each scale of the groove 6b of the counter 6 on the cassette side is extremely small as described above. Therefore, if there is any play between the counter driving convex portion 41a and the ratchet 34 when the ratchet is sequentially rotated to detect the last recorded track, the ratchet 34 will be affected by the play due to inertia, etc. The counter driving convex portion 41a moves extra, and the ratchet 34 moves with respect to the position of the groove 6b of the counter 5.
There is a possibility that the counter driving protrusion 41a will engage with the groove 5b of the counter 5 even though the rotational position of the counter has not reached the normal position. However, in this embodiment, when the ratchet 34 is sequentially rotated to detect the last recorded track, the counter driving protrusion 41a is fixed to the ratchet 34 via the cam 36 as shown in FIG. A spring 104 is attached to the convex portion A s 7 a of the driving member 37.
Since it is in a pressed state, there is no backlash, and there is no problem that the groove 5b of the counter 6 and the counter driving protrusion 41a engage with each other at an accurate position. Next, when sequentially driving the counters after engagement, if the configuration has almost no play between the counter driving protrusion 41a and the ratchet 34, the counter 6 on the cassette side
The click positions of the grooves 6b and the positions of the counter drive protrusions 41a with respect to the stop positions of the ratchets 34 must be made to completely match. In other words, if they do not match perfectly, the counter drive protrusion 41a will be pulled to the click position of the groove 5b of the counter 5 by an appropriate amount, and the ratchet 34 will rotate a little by that amount, and the ratchet 34 will be integrally attached to the ratchet 34. Fixed head (described later)
The cam 36 that determines the position of the head also rotates at the same time, causing the head position to deviate from the predetermined position. However, in this embodiment, especially when the counter 5 is sequentially driven as shown in FIG. Since it is in a state where it can move freely within the gap between it and the convex part B57b, there is an error between the click position of each groove 6b of the counter 6 and the position of each of the counter driving convex parts 41a relative to each stop position of the ratchet 34. There is no need to make precise adjustments like in the past. Note that the counter driving convex portion 41a is connected to the driving member 3.
However, before it engages with the groove 5b of the counter 5, the spring 104 prevents it from moving forward due to inertia and engaging before a predetermined position. Although the convex portion As7a is pressed, the load on the counter 6 is larger than the inertia force of the counter engaging member 41 at the stage of sequentially driving the counter 6 after engaging with the groove 6b of the counter 6. 5 will not be driven beyond the predetermined position.

1, the ratchet 34 is provided with a protrusion 60,
As shown in FIG. 4, the stopper 61 is used to set the initial value, and the end switch 62 is used to set the end of rotation. Since these are attached to the substrate 11 with screws 53a, 53b, and 54, their positions can be finely adjusted.

Now, a stopper claw 66 is pivotally supported on the shaft 55 implanted in the base plate 11, and is biased clockwise by a spring 68 applied between the shaft 55 and the pin 67 on the base plate 11. As a result, the stopper pawl 66 and the ratchet 34 engage with each other, and the ratchet 34 can be stopped at each tooth position. Now, when the solenoid 16 is energized, the drive lever 25
The clock rotates strangely. Therefore, the driving pawl 33 is always urged toward the ratchet 34 by the elastic force of the spring 32.
Rotate the ratchet 34 counterclockwise.

This stroke is set slightly larger than one tooth, and after the stopper pawl 66 advances to the next tooth, it is stopped by the stopper 69. In this state, ratchet 34
The stopper 69 is selected at a position such that even if the ratchet 34 tries to rotate further due to inertia, the stopper 69 and the drive pawl 33 will stop the ratchet 34 itself. After the ratchet 34 is advanced by one tooth, that is, the cam 36 and the counter drive pin 42 are advanced by one tooth, the power to the solenoid 16 is cut off, and the drive pawl 33 returns to the state shown in the figure. At this time, of course, the ratchet 34 remains advanced by one tooth, and by energizing the solenoid 16 once, the cam 3
6 and the counter drive pin 42 can be rotated by an angle corresponding to 341 teeth of the ratchet. By repeating this, it becomes possible to determine the above-mentioned rotation angle based on the number of times the solenoid 16 is energized.

Reference numeral 6o denotes a release lever, which is supported by a shaft 61 on the board 11 and biased counterclockwise by a spring 63 between it and the bottle 62. If you apply force in the direction of arrow 64 now, release lever 6
The tip 65 of the o presses the protrusion 66 of the stopper claw 66 to rotate it counterclockwise. Therefore, the engagement between the stopper pawl 66 and the ratchet 34 is released. At the same time, the tip 67 of the stopper claw 6e presses the protrusion 68 of the drive claw 33, causing the drive claw 3
3 and the ratchet 34 are also disengaged. Therefore, the ratchet 34 becomes free and rotates clockwise by the spring 47 described above, so that the protrusion 60 comes into contact with the stopper 61. In this state, the cam 35 and the counter drive bin 42 return to their initial positions, which can be instantaneously realized from any phase. If the force in the direction of arrow 64 is removed here, the same ratchet 34
rotational motion can be obtained. Note that 69 and 70 are stoppers that limit the stroke of the release lever 60.

On the other hand, a lever 72 is attached to a rotation shaft 71 implanted in the base plate 11.
The follower A73 at one end is supported by the cam 36.
It is in sliding contact with the outer peripheral portion 74 of. Also, 7 lower B at the other end
75 is in contact with a slider 76. This slider 76
Since the lever 72 is biased in the direction of the arrow 78 by the spring 77, the lever 72 is also biased clockwise, and as a result, the cam 3
The follower A73 is in a stable state in contact with the outer circumferential portion 74 of No.6. Note that the ratchet 34 is not rotated by this contact force.

The head and its surroundings will be explained below with reference to FIGS. 4 and 10. The head 79 is attached to the herad paste 8o, and the screw 8
1 is attached to the slider 76. An abutment pin 82 is embedded in the slider 7e, and forms a contact portion with the follower B76 described above. Reference numeral 83.84 is a guide rail, and while it is in contact with the protrusion 85.86 on the board 11, the screw 91 is inserted through the elastic holder 87.88.89.90.
It is held on the substrate 11 by 92.93.94.

However, screw holes 95 (the other one is not shown) are provided in the board 11 at both ends of the guide rail 84, and it is possible to push up the board 11 from the bottom with an adjustment screw 96. This will be explained later. The slider 76 is movable by being guided by a guide hole 97 in the guide rail 84 and a guide groove 98 in the guide rail 83, and as described above, due to the spring 77 between it and the board 11, it moves in the direction of the arrow 78. is energized by Further, the slider 76 is sunk into an opening 99 provided in the substrate 11.

Now, when the solenoid 16 is energized, the cam 3
6 can be advanced by one tooth. At this time, since the follower A73 of the lever 72 is in sliding contact with the outer circumference 74 of the cam 36, the lever 72 can be swung depending on its shape. In the case of the figure, as the cam 36 advances, the lever 7
2 rotates counterclockwise. Therefore, when the slider 7p is moved in the direction opposite to the arrow 78 against the biasing force of the spring T7, the result is K. That is, the suction force of the solenoid 16 must be strong enough to overcome all of these loads. Further, depending on the shape of the outer peripheral portion 74 of the cam 36, a predetermined amount of movement of the slider 76 can be easily obtained. When the power to the solenoid 16 is cut off, the position of the cam 36 is determined by the stopper claw 66, and at the same time, the position of the slider 76 is also determined.

Further, when a force is applied to the release lever 6o in the direction of the arrow 64, the cam 35 returns to the initial position as described above, and the outer peripheral portion 74
At the same time, the slider 76 returns to the initial position determined by .

Now, based on FIG. 11, the slider 76 and the guide rail 83
．． The positional relationship of 84 is shown. Two guide rails 83.8
The head base 80 is attached to the slider 76 so that the center of the head base 84 is on a straight line 101 extending almost directly below the gap 100 of the head 79. By doing this, the height of the upper end of the head 79 changes along the height of the guide rail 84. In other words, even if the other guide rail 83 changes in the direction of the arrow 102, if the guide rail 84 is positioned with high precision, the head 79 will only move in the direction of the arrow 103, with very little variation in height. can do. As a result, by adjusting the height position of the guide rail 84 using the adjustment screw 96 and the holder 89, the height of the head 79 in the movement path of the slider 76 can be determined easily and with high precision. Further, although the guide rail 83 is not provided with an adjustment mechanism in this example, it is of course possible to provide a mechanism for adjusting it in accordance with the guide rail 84, and in such a case, the accuracy will be further improved.

This concludes the explanation of the drive system of this rotating magnetic sheet device.
Finally, FIG. 12 shows the positional relationship with the aforementioned cassette. The spindle motor 12 is inserted into the spindle engaging hole 2a of the center core 2, the counter engaging member 41 and the counter driving protrusion 41a of the counter cslc' are inserted, and the head 79 is inserted into the cassette housing 3 through the insertion hole 3a. and is in contact with the magnetic sheet 1. In this state, the counter 6 is moved and the head 79 is moved by energizing the solenoid 16, and signals are recorded and played back on predetermined tracks, and the last end of the recorded track can be visually checked using the scale 36 as a guide. , and automatically records from a new track based on the phase of the counter 6. It is also possible, for example, to remove the cassette and apply force to the release lever 6° to return everything to its initial state.

Effects of the Invention The rotating magnetic sheet device of the present invention uses a cassette provided with a counter that displays the number of recorded tracks while holding it by an elastic click means, and a counter engaging member that engages and drives the counter. and a driving part that drives the counter engaging member in conjunction with the head, and when the counter engaging member is engaged with the counter and driven, the driving member and the counter engaging member have a certain gap. When the counter-engaging member is separated from the counter, the driving member is configured to restrict the position of the counter-engaging member from the rear with the elastic member biasing the counter-engaging member rearward from the front in the driving direction. By doing so, the display contents of the counter can be accurately detected, and the configuration is simple and does not require difficult adjustments, and its practical effects are great.

[Brief explanation of drawings]

FIG. 1 is a plan view of a magnetic disk cassette installed in a rotating magnetic sheet device of an electronic camera system, FIG. 2 is an explanatory diagram of the magnetic disk cassette, and FIG. 3 is a cross-sectional view of the main part of the magnetic disk cassette. FIG. 4 is a plan view showing the drive system of a rotating magnetic sheet device employing the present invention, FIGS. 6 and 6 are sectional views of essential parts of the device, and FIGS. Explanatory drawings, FIGS. 9 and 10 are perspective views of the main parts of the device, and
FIG. 1 is an explanatory diagram of the main parts of the device, and FIG. 12 is a diagram showing the device and the magnetic disk cassette installed. 3...Cassette housing, 5...Counter, 5a...Engagement hole, 5b...Groove, 34
...Ratchet, 35...Cam, 37.
...Drive member, 37a...Protrusion A. 37b... Protrusion B, 41... Counter engaging member, 41a... Counter driving protrusion, 4
3... Counter engagement switch, 72...
・Lever, 76...Slider, 79...
・Head, 104...Spring. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure? α Do / 3b 5 Figure 2 Figure 3 Figure 4 Cause Figure 5 Figure 7 Figure 8

Claims (1)

[Claims] A magnetic sheet rotatably housed in a cassette housing is used as a recording medium, and a counter is disposed within the housing for displaying the number of tracks recorded on the magnetic sheet while being held by an elastic click means. a counter-engaging member that can be engaged with and driven by the counter-engaging member;
and a drive member that drives the counter engaging member in conjunction with the head, the counter engaging member engaging the counter and being responsive to the elastic force of the elastic click means. a first position where the counter is driven against the counter and a second position where the counter is spaced apart;
In the second position, the driving member is configured to restrict the position of the counter engaging member from the rear in a state in which the counter engaging member is biased rearward from the front in the driving direction by an elastic member, and in the first position A rotating magnetic sheet device, characterized in that the elastic member and the counter engaging member are separated from each other, and the driving member and the counter engaging member are engaged with each other with a small gap.