JPS59180846A - Cassette shifting driver in magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce the vertical occupancy space for the entire mechanism of a driving arm by connecting the tip part of the driving arm to a moving element and simultaneously attaching movably the base end part of the arm at a prescribed position of a peripheral part as a mobile fulcrum to minimize the vertical movement amount. CONSTITUTION:For an arm 17, the base end part is attached to a cam 14 via a pin 18 serving as a mobile fulcrum together with the tip part attached to an interlocking lever 3 respectively. Thus the arm 17 moves with rotation along a locus prescribed by a mobile pin 18 and groove hole 1 after the backward shift of the cassette holding stage, i.e., in accordance with revolutions of a worm gear 12 and the cam 14. As a result, the tip interlocking part 20 of the arm 17 has the linear horizontal and vertical movements along the hole 1 together with the lever 3. Therefore the height position of the part 20 has virtually no change during a horizontal shift of the cassette holding stage. As a result, for the vertical space to be secured for movement of the arm 17, it is sufficient to secure a range of the height T1 from the center O' of the gear 12 at the heighest position of the arm 17 at the areas higher than the center O'.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cassette moving drive device for moving a cassette between a loading/unloading position and an operating position in a magnetic recording/reproducing apparatus such as a VTR that uses a so-called front loading/unloading system. .

In the above cassette front loading/unloading method (1 cm), the cassette is inserted through the cassette loading/unloading opening provided at the front of the magnetic recording/reproducing device, and the cassette holder holding the cassette is moved horizontally backward along the support frame. After being moved, it is moved vertically downward to reach the operating position, and when ejecting, it is moved in the opposite direction to the above and returned to the insertion/removal position. In a magnetic recording/reproducing device using this type of system, the general structure of the cassette moving drive device for moving the cassette as described above is to connect a worm gear provided on one side of the support frame to a motor via a worm. The rotational force of this worm gear is transmitted through a drive arm mechanism to a moving element such as a roller provided on both sides of the cassette pedestal, and this moving element is transferred to a moving element such as a roller provided on both sides of the cassette holder. By horizontally and vertically moving the slider along the slider guide path, the cassette holder is moved along the predetermined path.

To explain the conventional drive arm mechanism in such a drive device, in Fig. 6, (■) is a drive wheel consisting of a spur gear, etc., and the rotation of the motor is transferred to this drive wheel H via an intermediate transmission, a machine @. It can be conveyed.■ is an arm, and this arm■
is attached to the Vc drive wheel H so as to rotate together with the drive wheel H, and its tip is engaged and connected to the support shaft J of the mover through the elongated hole I<. L is a slot serving as a slider guide path, and is composed of a horizontal portion L1 and a vertical portion L2. When the arm I rotates integrally with the drive wheel H, the rotational motion of the arm I is transmitted as a linear motion to the slider support shaft JK through the elongated hole K, thereby causing the slider attached to the support shaft J to move. moves along the groove. However, according to this conventional configuration, since the arm I performs a rotational movement with a radius r using the drive wheel center 0 as a fixed fulcrum, the movement space t R (1, keep) of the drive arm The space required for the mechanism, especially in the vertical direction, becomes large.This increases the thickness of the entire magnetic recording/reproducing device, which is one of the factors that prevents the device from becoming more compact and lightweight.

Therefore, the present invention provides a drive device for moving a cassette in a magnetic recording/reproducing device, which can minimize the amount of movement of the arm in the drive arm mechanism, especially in the vertical direction, and reduce the space occupied by the entire mechanism in the vertical direction by 1. This is what I am trying to do.

The present invention is characterized in that the distal end of the arm in the drive arm mechanism is connected to the mover, and the base end of the arm is rotatably pivoted at a predetermined position on the periphery of the drive wheel to serve as a moving fulcrum. Due to the rotational movement of the arm around this moving fulcrum, when the cassette cradle is in the loading/unloading position, this arm protrudes as much as possible in front of the drive car, and as the cassette pedestal moves backward, the arm moves around the circumference of the drive car. 116 It is located at the stuttering point as if being drawn inward.

Hereinafter, Akira Kikaku's examples will be explained with reference to FIGS. 1 to 5.

A is a cassette pedestal, B is a support frame, and C is a chassis. The cassette pedestal A is located on the left and right side walls B of the support frame B.
1 t B 2 and accommodates a cassette (not shown) to be inserted from the cassette loading/unloading opening, and is supported between the support frames 9B1. Moves along BzK between the insertion/removal position ■ and the operating position. Note that a movement guide device for horizontally moving and vertically moving the cassette holder Ai along the support frame B, and a tape loading machine provided on the chassis CVc (explanation and illustration thereof will be omitted as it was well known in the past).

The support frame side walls B 1 + B 2 have horizontal parts 1
A yellow-shaped slot 1 consisting of a and a vertical section 1b is provided, and a horizontal section 2 is also provided along the outer surface [, % slot 1].
A rack 2 consisting of a vertical portion 2b and a vertical portion 2b is provided. These slots 1 and racks 2 constitute a slider guide path. On the other hand, on the cassette pedestal A, an interlocking rod 3 is rotatably attached to the lower surface of the bottom wall A1 so as to cross the bottom wall A1. Both pant parts of this interlocking rod 3 are connected to both side walls of the support frame B 1
The slot 1 of + B 2 is made to face the page and protrude to the outside of the side wall, and the projecting ends on both sides are provided with [lx (
-J, both the binions 4 and 5 are meshed with the rack 2. Of these two pinions 4.5, the right side pinion 5
k. A drive binion that is driven surfacewise by a drive arm mechanism installed on the outer surface of the support frame right wall B2. In this embodiment, a one-sided drive system is adopted in which the drive arm mechanism is provided only on one side of the support frame B. are doing.

Next, the main portion of the drive device including the drive arm mechanism will be explained.

6 is a motor mounted on the rear frame B3 of the support frame B, N is a worm, 8 is a worm support shaft, and this worm support shaft 8
and the rotation lll1h6a of the motor 6, Boo IJ9,
10 and a belt 11. 12
is a worm gear that the worm 7 meshes with, and the rotation of the mokro is caused by the pulleys 9, 10, the belt 11, and the worm 7.
The rotational force of the worm gear 12 is transmitted to the worm gear 2 through the worm gear 12, and the rotational force of the worm gear 12 becomes a source of force for moving the cassette pedestal A.

In this embodiment, a worm gear 1 is used as the driving force.
2 is used as a drive wheel in the drive arm mechanism. That is, the worm gear 12 is rotatably attached to a shaft 13 protruding from the outer surface of the right side wall B2 of the support frame. 1'1llll of this worm gear 12
, that is, the worm gear 12 and the support frame right side wall B2
In the past, a cam 14 was provided which rotated integrally around the gear 12 and the same shaft 3. This cam 14 has a cam surface 14a on the outer periphery, and this cam surface 14a operates the door opening/closing lever 15 rotatably attached to the right side of the support frame (till WB2) to automatically open the door 16 for loading and unloading young fish. This cam opens and closes.
Attach the proximal end of the arm 17 to the inner surface of the object at a predetermined position around the pin 1.
It is rotatably stored via the 8. This arm 171
-j: The entire body is formed in a gently curved shape and is provided with a hook-shaped retaining portion 20 having an L-shaped groove 19 at the tip, and this tip engaging portion 20 is made to protrude from the drive pinion 5. Engage with the right end of the interlocking rod 3. Also, cam 14
A KLL-shaped groove 21 is provided on the inner surface of the periphery of the arm 17 on the opposite side from the position where the arm 17 is pinned.

In addition, due to the positional relationship between the slot 1 in the right side wall B2 of the support frame, the worm gear 12, and the cam 14, the rear part of the horizontal part 1a and the entire vertical part 1b of the slot 1 are within the circumference of the worm gear 12. The positional relationship of the king is set so that the concave groove 21 of the sword cam 14 forms a set with the slot 1 over a predetermined rotation fullHK during the rotation of the cam 14.

Next, the operation of the single arm mechanism will be explained.

When the cassette pedestal A is in the loading/unloading position shown in Fig. 1.2 and Fig. 4 (a), the arm 17 is pushed forward to the maximum from the ohm tooth claw 12 as shown in Fig. 5 (a). It is in an extremely conspicuous condition. Now, when the worm gear 12 rotates clockwise in the figure, the cam 14 rotates together with the gear 12 and pulls the arm 17 to the right. Therefore, the interlocking rod 3 moves to the right along the horizontal portion 1aK of the slot 1, and the driving and driven pinions 5, 4 simultaneously move to the horizontal portion 2aK of the rack 2.
move along. As a result, the car 77 cradle A is horizontally moved rearward.

In the middle of the backward horizontal movement of this cassette pedestal A, the fifth
As shown in FIG. Due to the combination, the rotational force of the cam 14 becomes i! Ti 'J (h) is applied to the rod 3 as a tensile force. At this time, the arm 17 moves together with the interlocking rod 3 in an unloaded state where the tip engaging portion 20 is only held on the interlocking rod 3. In this way, the cassette cradle A
From the middle of the horizontal movement, the interlocking rod 3 is moved by the cam 14, and in this state, the interlocking rod 3 moves in the latter half of the horizontal part 1a of the slot, and then moves the vertical part 1b as shown in Fig. 4 (b):L.
- and moves downward to the predetermined position shown in FIG. 5 p'llc.

Therefore, the arm 17 has its base end accommodated in the pin 181/il, which is a moving fulcrum; therefore, its distal end is accommodated in the cam 14 and the interlocking rod 3, so that the rearward movement of the power yacht pedestal A, That is, in accordance with the rotation of the worm teeth 111j12 and the cam 14, it moves while rotating along a locus regulated by the moving pin 18 and the slot 1. As a result, the arm 17 is drawn into the circumference of the worm gear 12 as the cassette pedestal A moves backward, and finally extends along the axis 13 of the gear 12 as shown in FIG. 5e'11. It is in a state where it falls within lI1 circumference of the gear 12. In other words, this arm 17 is different from a conventional arm that simply rotates around a fixed fulcrum;
0 moves linearly horizontally and vertically along the slot 1 with the interlocking rod 3. Therefore, the height position of the arm tip 20 hardly changes during the horizontal transfer of the cassette pedestal A. Therefore, the vertical space that must be secured for the movement of the arm 17 above the worm gear center 0' is the height from the gear center 0' of the maximum height position of the arm in the state shown in Figure 5 (a). A range of T1 (in this embodiment, the radius dimension of the gear 120 or less) is sufficient. In addition, the vertical space required for the movement of the entire carving arm mechanism including the worm gear 12 is approximately the diameter of the worm gear 12, and in the case of the conventional device shown in FIG. The vertical movement space can be significantly reduced. This contributes to making the entire magnetic recording/reproducing device more compact (reduced thickness) and lighter. Furthermore, if the relative positional relationship between the slot 1 and the arm 17 is L/'1, the height of the slot 1 can be lowered, so that the interlocking rod 3 can be lowered as in this embodiment.
can be provided below the cassette holder A.

If the interlocking rod 3 is placed below this cassette pedestal A, the space above the cassette pedestal A can be saved compared to the case where the interlocking rod 3 is placed above the cassette pedestal A. When returning from the operating position of 4th row) to the loading/unloading position of 4th row (a), contrary to the above, the interlocking rod 3 is moved upward by reversing the cam 14, and then horizontally moved forward.
From the middle of this horizontal movement, the driving means of the interlocking rod 3 starts moving to the arm 1.
7 and returns to the state shown in FIG. 5(a).

Next, other embodiments of the present invention will be illustrated.

(a) In the above embodiment, the cam 14 for operating the door opening/closing lever 15 was used as a part of the drive arm mechanism 1, but if the door is to be opened and closed by another means, etc. If the cam 14 is no longer needed, a rotating body equipped with a groove 21 as a substitute for the cam 14 can be used as the worm gear 12.
It can be integrally molded or fixed on the back side.

(b) Furthermore, the present invention is not limited to the structure in which the driving of the interlocking rod 3 is shared between the cam 14 having the groove 21 or its substitute and the arm 17, but the connection between the arm 17 and the interlocking rod 3. By devising the structure, etc., it is also possible to configure the arm 17 alone to drive the interlocking rod 3 all the time. In this case, the arm 17'f is directly accommodated in the worm gear 12.
A structure in which 2 is also used as the W movement part of the drive arm mechanism.
However, the present invention has been adopted generally in the past,
A gear of an intermediate transmission mechanism, such as a spur gear other than the worm gear 12, can also be applied to a configuration in which a rotating body other than a gear (boo, etc.) is used as a driving wheel.

(2) In the above embodiment, the structure is based on a one-sided drive system in which the main drive mechanism is provided only on one side of the support frame B, but the present invention provides an intermediate transmission mechanism that is symmetrically provided on both sides of the support frame B. Of course, it is also applicable to a double-sided drive system in which these are connected by a fixed transmission shaft and the rotational force of the worm gear is distributed to both sides.

(e) In the above embodiment, the movable element is a binion of 4°5.
However, instead of the pinion 4.5, a roller or a slider may be used to roll or slide along the guide groove.

As described above, according to the present invention, the drive arm mechanism that transmits the rotational force of the motor to the movers on both sides of the cassette holder as a linear motion is designed to minimize the vertical space required for arm movement. It is possible to significantly reduce the vertical movement space occupied by the entire drive arm mechanism, and this can greatly contribute to making magnetic recording and reproducing devices more compact and lightweight. .

[Brief explanation of drawings]

The figures show an embodiment of the present invention, in which Fig. 1 is a perspective view with the cassette movement guide mechanism etc. omitted, Fig. 2 is a perspective view seen from a different direction from Fig. 1, Fig. 3 is an exploded perspective view, Figure 4 (a) (
＠ is a side sectional view for explaining the movement mode of the cassette pedestal, FIG. It is a diagram for explaining the structure and operation of the A... cassette holder, B... support frame, ■...
- Groove forming the FBI guideway for the mover, 2...the same rack, 1a. ]b...Horizontal and vertical parts of l1tj hole, 2a, 2
b...Horizontal and vertical parts of the rack, 4, 5... Binion as a mover, 3... Interlocking rod of both pinions,
6... Motor, 12... Worm gear as a drive wheel, 14... Cam for purchasing the I-motion arm mechanism, 17.
・・Same arm, 18・・Same arm pivot pin, 20・
...Tip engagement part of the same arm. Patent applicant Imaike Seiko Co., Ltd.

Claims (1)

[Claims] 1. Name of magnetic recording/reproducing device A cassette inserted through a cassette slot provided on the curved surface of the main body is housed in a cassette cradle, and during operation, this cassette cradle is moved horizontally backward along a support frame and then vertically moved. In a magnetic recording/reproducing device in which the cassette cradle is moved downward to reach the operating position, and when ejecting, the cassette pedestal is moved in the opposite direction to the above [8] to reach the loading/unloading position. Both the provided mover and the support frame (
A slider guide path consisting of a horizontal portion and a vertical portion provided at 1111, and a drive for transmitting the rotational force of the slider as a linear motion to both side sliders to move the slider along the slider guide path. Arm mechanism and tool ON L, this drive 7'-
The seedling machine (seedlings) includes a drive wheel which is rotated by the motor, a proximal part connected to the mover, and a proximal end rotatably pivoted to a predetermined position shield at a circumference of the drive wheel. When the cassette cradle is in the top-loading/unloading position, this arm protrudes toward the front of the drive car, and as the cassette pedestal moves backward, the arm is retracted toward the inner circumference of the drive car. A drive device for moving a cassette in a magnetic recording/reproducing device having the following structure.