JPH0447792Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is suitably installed in, for example, a magnetic tape recording/reproducing device called a video tape recorder, and is used to load or eject a magnetic tape cassette into or from the video tape recorder. The present invention relates to a loading device that performs the following operations.

Prior Art FIG. 5 is a simplified side view of a prior art magnetic tape recording/reproducing device called a so-called video tape recorder. The configuration of the video tape recorder 1 will be explained with reference to FIG. A magnetic tape cassette 2 containing a so-called video tape is inserted into a video tape recorder 1 along an insertion direction A1. When the magnetic tape cassette 2 is inserted by the operator's hand to the state shown in FIG. , the switch 5
make it work.

At this time, the loading motor 7 is started, the worm 8 coaxially fixed to the rotating shaft of the loading motor 7 is rotationally driven, and the drive gear 9 is rotated at the arrow A.
Angular displacement in two directions. Therefore, the drive lever 10 fixed to the drive gear 9 is angularly displaced in the direction of arrow A2. At this time, a guide pin 11 is erected in the cassette garage 3 toward the front side of the paper in FIG.
A guide slot 14 is formed in the side plate 13 fixed to the drive lever 10, and a guide slot 15 is formed in the drive lever 10 in a direction intersecting the insertion direction A1. It is inserted.

Therefore, as the drive lever 10 is angularly displaced in the direction of arrow A2, the peripheral edge of the guide elongated hole 15 presses the guide pin 11 to the left in FIG. Further, in the cassette garage 3, a guide pin 16 is erected toward the front side of the paper in FIG. It slides into the hole 17. Therefore, the cassette garage 3 is connected to the guide pin 1.
1 and 16, it is moved, for example, to the left in FIG. 5 while maintaining a horizontal state.

The guide slots 14 and 17 are aligned in the insertion direction A1.
After extending a predetermined length along the line, the elevating slots 14a, 17 are formed downward in a predetermined length as shown in FIG.
After the guide pins 11 and 16 reach the downstream end of the guide slots 14 and 17 in the insertion direction A1, the drive gear 9 continues to move in the direction indicated by the arrow A.
The angular displacement in the two directions continues, and therefore the guide pins 11 and 16 are displaced downward in the elevating slots 14a and 17a in FIG. 5. When such downward displacement is completed, the positioning holes (not shown) formed in the magnetic tape cassette 2 are aligned with each other.
A positioning shaft 18 fixed to the chassis 12 of the video tape recorder 1 or the like is inserted through this hole, and thus the magnetic tape cassette 2 can be loaded into a loading position where recording/reproduction is possible.

When trying to eject the magnetic tape cassette 2 loaded in this way, the video tape recorder 1
By pressing, for example, an eject button (not shown) provided at , the loading motor 7 is rotated in the opposite direction to that during loading, and the drive gear 9 is rotated in the direction of arrow A3. The cassette garage 3 in which the magnetic tape cassette 2 is stored in this manner is moved in the direction opposite to the movement along the arrow A4 during loading described above, and the magnetic tape cassette 2 is ejected from the video tape recorder 1. be able to.

Problems to be Solved by the Invention In the prior art as described above, the magnetic tape cassette 2 is inserted into the video tape recorder 1 in the direction A.
The downstream end of the magnetic tape cassette 2 in the insertion direction A1 contacts the stop piece 19 of the cassette garage 3, displacing the cassette garage 3 to the left in FIG. 5, and loading it with the drive pin 4. The starting switch 5 was activated. Therefore, even if the magnetic tape cassette 2 is not securely stored in the cassette garage 3, if the cassette garage 3 is displaced to the left in FIG. 5 and the drive pin 4 presses the lever 6, the switch 5 will operate. As a result, during the above-mentioned loading operation, the magnetic tape cassette 2 comes into contact with an undesired part of the video tape recorder 1 with excessive force, resulting in a situation where the magnetic tape cassette 2 is not loaded correctly. There was a problem with that.

An object of the present invention is to provide a loading device that solves the above-mentioned problems and prevents errors in loading operations.

Means for solving the problems In order to achieve the above object, the present invention comprises: a transport member having a rack formed at its lower end and reciprocatingly displaced in the direction in which a magnetic tape cassette is inserted and removed; a lifting member which carries a magnetic tape cassette and is stored within the transport member and is lifted and lowered at one of the displacement end positions of the transport member; connecting means using a link for connecting the lifting member to the transport member so as to be freely lifted and lowered; a cam member having a cam groove formed therein and which is driven for angular displacement in forward and reverse directions; a drive member having a follower which slides in contact with the cam groove of the cam member and which is made of a drive lever which displaces the lifting member in one direction along the lifting direction; and biasing means for biasing the lifting member in the other direction along the lifting direction by a torsion spring. The cam member has a horizontal axis perpendicular to the reciprocating displacement direction of the transport member, a cam groove is formed on one side along the axial direction, and teeth are formed on the outer side over a predetermined length, and these teeth mesh with a pinion fixed coaxially to a drive gear that meshes with a rack formed on the lower end of the transport member, and the cam groove of the cam member is divided into a second cam groove portion whose radial distance changes as the cam member rotates, and a second cam groove portion whose radial distance changes as the cam member rotates.
This loading device is formed of first and third groove portions which are connected to both ends of the cam groove portion and whose radial distance does not change, and is characterized in that the cam member is driven and angularly displaced to reciprocate the transport member and to lift and lower the lift member.

Function To carry out a loading operation using the loading device of the present invention, first, the cam member is driven for angular displacement in one direction.
The angular displacement movement of the cam member causes the transfer member to be transferred in one direction. When the transfer member is transferred by a predetermined amount in the one direction, the drive member includes a follower that slides into a cam groove formed in the cam member,
The elevating member is displaced in one direction against the urging force of an urging means that urges the elevating member in the other direction. In this way, the loading operation can be realized.
Further, in order to perform the ejecting operation using this loading device, the cam member may be angularly displaced in the opposite direction. At this time, the transfer member is transferred in a direction opposite to the traveling direction, and the loaded object can be discharged. In this way, the loading/unloading operation of the loaded object can be realized without touching the transfer member, thereby preventing the occurrence of errors associated with such operations.

Embodiment FIG. 1 is a side view showing a partial cross section of a magnetic tape recording/reproducing device called a so-called video tape recorder according to an embodiment of the present invention, and FIG. 2 is a partial exploded view of a video tape recorder 21. FIG. The configuration of the video tape recorder 21 will be described with reference to FIGS. 1 and 2. Note that FIG. 1 shows the state of the video tape recorder 21 at the time of so-called ejection. The magnetic tape cassette 22, which is an object to be loaded, is placed on a cassette garage 23, which is an elevating member, and is guided by guide pieces 24 and 25, which are erected on the cassette garage 23 in the direction perpendicular to the paper surface of FIG. The position is regulated to the right in FIG. 1 by a stop piece 26 provided on the cassette garage 23, and to the left in FIG. Its position is regulated by a stop portion 28 provided near the side (left side in FIG. 1).

In this way, the magnetic tape cassette 22 is transferred to the cassette garage 23 disposed within the slider 27.
The device can be stored inside the device without causing undue rattling. Further, the slider 27 is reciprocated in the direction of arrow B1, which is the insertion direction of the magnetic tape cassette 22, or in the direction of arrow B2, which is the removal direction, as will be described later.

The cassette garage 23 and the slider 27 are connected by a pair of links 29 and 30, which are connecting means, so as to be movable up and down, as will be described later. That is, the through hole 31 formed at the upstream end of the link 29 in the arrow B1 direction is connected to the cassette garage 2.
3, near the upstream end in the direction of arrow B1, it is fitted with a pivot 32 which is erected toward the front side of the paper in FIG.
A guide shaft 33 is erected toward the front side of the paper surface of the figure,
The guide hole 35 is slidably inserted into one side wall 34 of the slider 27 and extends along the direction of the arrow B1.

A through hole 37 is formed near the upstream end in the arrow B1 direction of the link 30 which is pin-coupled to the link 29 at the fulcrum 36, and a through hole 37 is formed near the upstream end in the arrow B1 direction of the slider 27 as shown in FIG. It is fitted into a pivot shaft 38 which is erected toward the back side of the paper surface so as to be freely angularly displaceable. Further, near the other end of the link 30, a guide shaft is erected toward the back side of the paper in FIG. Fits in slidably.

A cassette garage 23 is attached to the pivot 32,
A torsion spring 41 is provided as a biasing member for biasing upward, which is the other direction along the vertical direction, and one end portion 42 of the torsion spring 41 is located near the through hole 31 of the link 29 in a direction perpendicular to the paper plane of FIG. The other end 44 abuts on a locking piece 43 extending from above in FIG. 1, and the other end 44 abuts on the cassette garage 23 from below in FIG. This torsion spring 41, which is partially wound, is biased such that the one end 42 and the other end 44 approach each other in the circumferential direction of the torsion spring 41.

That is, at the so-called ejecting time shown in FIG. 1, due to the spring force of the torsion spring 41,
The link 29 is biased so as to be angularly displaced around the axis of the guide shaft 33 in the counterclockwise direction in FIG. The cassette garage 23 is at the end of its displacement upwardly in FIG. 1, and is restricted to this position by the spring force of the torsion spring 41.

A pair of guide plates 46 are provided on both side walls 34a and 34b of the slider 27 in a direction perpendicular to the plane of the drawing in FIG. 47, and the slider 27 is supported by contacting support rollers 49 and 50 rotatably fixed to the chassis 48 of the video tape recorder 21 from above in FIG. The structure is such that the reciprocating displacement between the

Further, a loading motor 51 is fixed to the chassis 48, etc., a pulley 52 is coaxially fixed to the rotation axis of the loading motor 51, and a pulley 54 and a belt 55 are coaxially fixed to a worm 53 having a rotation axis parallel to the pulley 52. The power of the loading motor 51 is transmitted to the worm 53.

A worm wheel 56 meshes with the worm 53, and a relay gear 58 meshes with a gear 57, which has a smaller diameter than the worm wheel 56 and is formed coaxially. A gear 59 that is integrally formed coaxially with the relay gear 58 and has a smaller diameter than the relay gear 58 is a gear 76.
The gear 76 is coaxially and integrally formed with a cam member 61 in which teeth 60 are formed over a circumferential length based on a predetermined angle θ on the radially outer side. The cam member 61 has a horizontal axis perpendicular to the direction of reciprocating displacement of the slider 27.

On one side of the cam member 61 in the axial direction opposite to the gear 76, there is a cam groove 6 which has a substantially spiral shape and whose radial distance gradually increases in the clockwise direction in FIG.
2 is formed. A drive lever 64 having a protruding guide pin 63 which is a follower that fits into this cam groove 62 is connected to a side plate 64 fixed to the chassis 48.
5 by a pivot shaft 66 so as to be freely angularly displaceable.
The drive lever 64, which is this drive member, is used to move the cassette garage 2 on which the magnetic tape cassette 22 is mounted.
The magnetic tape cassette 22 is bent in a roughly dogleg shape in order to press the magnetic tape cassette 3 in one direction along the vertical direction, and the magnetic tape cassette 22 is bent in the vertical direction at the end opposite to the guide pin 63, as will be described later. A pressing piece 67 is provided that presses downward in one direction in FIG. 1.

A pinion 68 that meshes with the teeth 60 of the cam member 61 is also provided. When the guide pin 63 as a follower is in the cam groove 62 of the cam member 61 near the counterclockwise end position in FIG. It is placed in a position that meshes with the surrounding area. Also, the pinion 68 is coaxial with this pinion 68.
The drive gear 69 having a larger diameter extends from the most downstream end of the slider 27 in the transfer direction B1 to a length L2 that exceeds a transfer distance L1 of the slider 27 in the directions of arrows B1 and B2. The rack 7 formed at the lower end of the side wall 34a in FIG.
meshes with 0.

That is, the slider 27, which can be smoothly moved in the direction of the arrow B1 or the direction of the arrow B2 by the pair of support rollers 49 and 50, is moved in the direction of the arrow B by the rotation of the pinion 68 and the drive gear 69.
It can be transported in one direction or in the arrow B2 direction.

The chassis 48 is also provided with a positioning shaft 71 and a cassette stay 72 for positioning the magnetic tape cassette 22 at a loading position when the magnetic tape cassette 22 is loaded into the video tape recorder 21 as will be described later. Also slider 27
The front plate 73 of the cassette garage 23 has a first
As shown in the figure, a loading start switch 74 is provided to start the loading motor 51 when the magnetic tape cassette 22 is stored.

FIG. 3 is a sectional view of the slider 27 after it has completed its displacement in the direction of arrow B1. The movement of the slider 27 in the direction of arrow B1 will be described with reference to FIGS. 1 to 3. As described with reference to FIG. 1, when the loading start switch 74 is pressed with the magnetic tape cassette 22 stored in the cassette garage 23, the loading motor 51
is started in the forward rotation direction, and its driving force is transmitted by the belt 55.
The worm 53 is rotated about its axis via the pulleys 52 and 54 on which the gear 76 and the cam member 61 are rotated, and the worm 53 is rotated around the axis through the pulleys 52 and 54 on which the gear 76 and the cam member 61 are rotated. Angular displacement in the C1 direction.

Here, in the cam groove 62, the cam member 61 is C1
a first groove portion 62a whose radial distance is uniform with respect to the axis of the cam member 61 when angularly displaced in the direction;
A second groove portion 62b that is continuous with the first groove portion 32a and has a gradually increasing radial distance; and a third groove portion 62c that is continuous with the second groove portion 62b and has a uniform radial distance that is larger than that of the first groove portion 62a. Consisting of
These are formed consecutively in this order.

With the angular displacement of the cam member 61 in the direction of arrow C1, the guide pin 63, which is a follower, moves into the first groove portion 62.
Slide a. In the area of the first groove portion 62a, the guide pin 63 does not move in the radial direction of the cam member 61, ie no angular displacement about the axis of the pivot 66 of the drive lever 64 occurs. In this process, the pinion 68 that meshes with the teeth 60 of the cam member 61, and thus the drive gear 69, are rotated in the direction of arrow C2, and the slider 27, on which the rack 70 that meshes with the drive gear 69, is formed. , can be transported in the direction of arrow B1.

The transfer amount L1 of the slider 27 is determined by the amount L1 of the slider 27.
It is determined by the angle θ at which the first tooth 60 is formed. Therefore, when the slider 27 has been moved in the direction of arrow B1 and has been fully housed in the housing 75 of the video tape recorder 21 as shown in the third figure, the teeth 60 of the cam member 61 and the drive gear 68 are in mesh with each other. The above-mentioned θ is determined such that θ is canceled.

Even when the above-mentioned meshing state is released, the meshing state between the gear 76 and the gear 59, which are arranged coaxially with the cam member 61 and in which the gear 59 meshes, continues, so that the cam member 61 Continue the angular displacement in the C1 direction. At this time, the guide pin 63, which is a follower, slides in the second groove portion 62b. The guide pin 63 is therefore displaced radially outward of the cam portion 61 and the drive lever 64 is angularly displaced about the axis of the pivot 66 in the direction of arrow D1. This angular displacement causes the pressing piece 67, which is integrally formed with the drive lever 64, to
It comes into contact with the top surface of the figure and further presses it downward.
This pressing operation is performed against the spring force of the torsion spring 41.

FIG. 4 shows the video tape recorder 2 at the end of the angular displacement operation of the drive lever 64 in the arrow D1 direction.
1 is a side view showing a partial cross section of FIG. Also refer to FIG. As explained with reference to FIG. 3, as the drive lever 64 is angularly displaced in the direction of the arrow D1, the pressing piece 67 resists the spring force of the torsion spring 41 and releases the magnetic tape cassette 22 and the cassette garage. 23 downwards in FIGS. 3 and 4. This push-down operation basically ends when the guide pin 63 of the drive lever 64, which is a follower, passes through the second groove portion 62b of the cam member 61 and moves to the third groove portion 63c. That is, the third groove portion 62c has a substantially uniform radial distance around the axis of the cam member 61, so that no angular displacement occurs around the axis of the pivot shaft 66 of the drive lever 64.

With the guide pin 63 reaching the third groove portion 62c in this way, the loading motor 51 (first
(see figure) is cut off, and when the guide pin 63 reaches the vicinity of the end position of the third groove portion 62c in the clockwise direction in Figure 4, the cam member 6
The angular displacement operation of 1 is stopped. At this point, the magnetic tape cassette 22 is positioned at a loading possible position by the positioning shaft 71 provided on the chassis 48, and is pressed against the cassette stay 72. This pressing force is caused by the spring force of the pressing piece 67. That is, the drive lever 64 is
It is set so that it is angularly displaced in the direction of arrow D1 to the extent that a spring force of 7 is applied.

When attempting to eject the magnetic tape cassette 22 loaded into the video tape recorder 21 as described above, for example, by pressing an eject button (not shown), the loading motor 51 is activated in the opposite direction to that described above. The gear 76, which is always in mesh with the gear 59, and therefore the cam member 61 start angular displacement in the direction of arrow C3.
In this angular displacement operation, while the guide pin 63, which is the follower of the drive lever 64, is sliding in the third groove portion 62c, the guide pin 63 does not start displacing the cam member 61 inward in the radial direction; Therefore, no angular displacement about the axis of the pivot shaft 66 of the drive lever 64 occurs. Also, during this period, the teeth 60 of the cam member 61 do not mesh with the pinion 68, so the drive gear 6
9 doesn't rotate either.

The guide pin 63 reaches the second groove portion 62b with the angular displacement of the cam member 61 in the direction of arrow C3, and during the period in which it slides, the guide pin 63 moves inward in the radial direction of the cam member 61. do. As a result, the drive lever 64 moves in the direction indicated by the arrow D2 opposite to the direction D1.
The pressing piece 67 is gradually displaced upward. At this time, the cassette garage 23 and the magnetic tape cassette 22 are displaced upward by the spring force of the torsion spring 41, and the guide pin 63 reaches the end position in the counterclockwise direction in FIG. 3 of the second groove portion 62b. Then, the cassette garage 23 and the magnetic tape cassette 22 reach the end position of the upward displacement, and the drive lever 64 further moves toward the arrow D2.
The angular displacement in the direction continues, and the state shown in the third figure is reached.

From now on, the guide pin 63 is connected to the cam member 61.
reaches the first groove portion 62a. At this point, the teeth 60 of the cam member 61 mesh with the pinion 68,
The pinion 68 therefore drives the drive gear 69 with the arrow C4.
Rotate in the direction. This rotation causes the slider 27
is moved in the direction of arrow B2, and when it is moved to the state shown in the first figure, this position is detected and the driving of the loading motor 51 is stopped.

In this manner, in the video tape recorder 21 of this embodiment, the loading and unloading of the magnetic tape cassette 22 can be carried out reliably. Furthermore, at the time of loading, the magnetic tape cassette 22 only needs to be placed on the cassette garage 23, and as explained in the section of the prior art, the magnetic tape cassette 22 is placed inside the video tape recorder 21 by the operator's hand or the like. There is no need to twist and push it in. Therefore, errors during the loading operation as pointed out in the prior art section are prevented from occurring, and the convenience of the video tape recorder 21 using such a configuration is greatly improved. .

The application of the loading device of the present invention is not limited to the video tape recorder 21 in the above-described embodiment, but can be implemented in a wide range of technical fields that require the operation of loading objects.
Further, the configuration and the shape of the corner portions for realizing the present invention are not limited to the configuration and the shape of each portion described in the above-described embodiments.

Effects According to the present invention as described above, in order to carry out a loading operation using the loading device of the present invention, the cam member is first driven for angular displacement in one direction. The angular displacement movement of the cam member causes the transfer member to be transferred in one direction. When the transfer member is transferred by a predetermined amount in the one direction, the drive member includes a follower that slides into a cam groove formed in the cam member, and resists the urging force of the urging means that urges the elevating member in the other direction. Then, the elevating member is displaced in one direction. In this way, the loading operation can be realized.

Further, in order to perform the ejecting operation using this loading device, the cam member may be angularly displaced in the opposite direction. The elevating member is displaced in the other direction along the elevating direction by the urging force of the urging means, and is returned and accommodated within the transfer member. At this time, the transfer member is transferred in a direction opposite to the traveling direction, and the loaded object can be discharged. In this way, the loading/unloading operation of the loaded object can be realized without touching the transfer member, thereby preventing the occurrence of errors associated with such operations.

Since the cam member according to the present invention has an axis perpendicular to the reciprocating direction of the transfer member, the mechanism for pushing down the magnetic tape cassette to a position where it can be loaded is extremely simplified, and the overall shape of the tape recorder is also compact. can be converted into Furthermore, the cam member has a cam groove and teeth formed on its outer periphery, and has both the function of moving the elevating member downward and the function of reciprocating the transfer member, which simplifies the mechanism and reduces costs. It helps a lot with downs.

Since the cam groove is provided with a third groove portion having a uniform radial distance, it is possible to prevent the follower of the driving member from coming into contact with the end portion of the cam groove when the magnetic tape cassette is being loaded. Recording and playback operations can be maintained.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a partial cross section of a video tape recorder 21 according to an embodiment of the present invention in a state at the time of completion of ejection, FIG. 2 is an exploded perspective view of a portion of the video tape recorder 21, and FIG. A partially sectional side view showing the slider 27 housed in the housing 75 in the tape recorder 21, FIG. 4 is a partially sectional side view showing the state when the magnetic tape cassette 22 is fully loaded, and FIG. 1 is a sectional view of a technical videotape recorder 1; FIG. 21...Video tape recorder, 22...Magnetic tape cassette, 23...Cassette garage, 2
7...Slider, 29, 30...Link, 33,
39... Guide shaft, 35, 40... Guide slot, 36
...Fully point, 41...Twist, 51...Loading motor, 60...Teeth, 61...Cam member,
62...Cam groove, 62a...First groove portion, 62b
...Second groove portion, 62c...Third groove portion, 63...
... Guide pin, 64 ... Drive lever, 67 ... Pressing piece, 69 ... Drive gear, 70 ... Rack.

Claims (1)

[Scope of Claim for Utility Model Registration] A transfer member having a rack formed at its lower end and reciprocally displaced along the direction in which a magnetic tape cassette is inserted and removed; , an elevating member that is moved up and down at one displacement end position of the transfer member; a connecting means using a link that connects the elevating member to the transfer member so as to be movable up and down; a drive member comprising a driven cam member, a drive lever that includes a follower that slides into a cam groove of the cam member and displaces the elevating member in one direction along the elevating direction thereof; and a biasing means for biasing in the other direction along the vertical direction, the cam member having a horizontal axis perpendicular to the direction of reciprocating displacement of the transfer member, and a cam groove formed on one side surface along the axial direction. At the same time, teeth are formed over a predetermined length on the outer side, and these teeth mesh with a pinion coaxially fixed to a drive gear that meshes with a rack formed at the lower end of the transfer member, and the cam The cam groove of the member includes a second cam groove portion whose radial distance changes as the cam member rotates, and a second cam groove portion.
It is formed of first and third groove portions that are connected to both ends of the cam groove portion and whose radial distance does not change, and when the cam member is driven and angularly displaced, the transfer member is reciprocated. A loading device characterized in that an elevating member is moved up and down.