JPH0341303Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is for pulling out a tape-shaped recording medium used in a video tape recorder etc. from its cassette and bringing it to a predetermined position on the tape recorder where it can be recorded and played back. The present invention relates to a tape loading device.

(Prior Art) An example of a conventional tape loading device is shown in FIG. In the figure, a cam gear 91 integrally has a cam, and when this cam is rotated, a sector gear 92 is rotated by the cam, and a small gear 93 is driven. The small gear 93 integrally includes a large gear 94 and a link 95, the large gear 94 meshes with a gear 96 of the same diameter arranged next to it, and the gear 96 integrally includes a link 97. There is. Now, when the cam gear 91 is driven, the sector gear 92 is rotated by the cam, the gear 93 is driven, and the gear 94 and the gear 96 are driven in opposite directions.
When the gears 94 and 96 are driven, links 95 and 97 that are integral with these gears are driven, and a pair of tape guides (not shown) are moved by these links 95 and 97. Bring the tape to a predetermined position where it can be recorded and played.

Another example of a conventional tape loading device is the one described in Japanese Patent Application Laid-Open No. 107355/1983. The device described in the publication includes a tape loading cam body, a pair of loading arms, and a lever that transmits the movement of the cam body to the pair of loading arms, and the cam body is driven. Then, this driving force is transmitted to a pair of loading arms via a lever or the like, and the loading arms are driven, thereby performing tape loading.

(Problem to be solved by the invention) According to the former of the above conventional techniques, the number of parts increases because a sector gear and many gears of various sizes are required to drive the link. There is a problem in that it requires space for the gears to move, and since the gears are three-dimensionally connected, the space occupied is large and it is difficult to reduce the thickness.

According to the latter conventional example, in order to move the pair of loading arms by the distance necessary to perform a predetermined tape loading, the lifting height of the tape loading cam body must be made sufficiently large, or the cam The lever that transmits the movement of the body to the pair of loading arms needs to be longer, which also occupies a larger space.Also, since the lever is required between the cam body and the pair of loading arms, the number of parts is reduced. There will also be more.

(Means for Solving the Problem) The cam body has a cam body driven by a motor, and a tape loading link that is moved by the drive of the cam body and loads the tape. The link has a first cam part and a second cam part, and the link has a first cam part and a second cam part of the cam body.
A first member that engages with the cam portion of the link to move the link.
and a second cam that engages with a second cam portion of the cam body to further move the link after the link is moved by engagement between the engaging portion and the first cam portion. An engaging portion is provided.

(Operation) When the cam body is driven by the motor, first,
The link is moved by the engagement between the first cam part of the cam body and the first engaging part of the tape loading link, and then the second cam part of the cam body and the tape loading link are moved. The engagement of the link with the second engagement portion causes the link to move further and reach the tape loading completion position.

(Embodiment) In FIG. 3, reference numeral 10 indicates a main chassis, and a motor 20 is attached to this main chassis 10. The rotational force of the motor 20 is transmitted to a worm gear 25 via a pulley 21 , a belt 22 , a pulley 23 , and a worm 24 . The rotational force of the worm gear 25 is further transmitted to the drive gear 9 via reduction gear trains 26, 27, 28, 29.
transmitted to. The rotational force of the gear 9 is further transmitted to the cam gear 6 as a cam body. The cam gear 6 is rotatably supported on the base 1 by a shaft 6a, and the base 1 is appropriately fixed on the main chassis 10 by supports 2, 2.

Cam grooves are formed on both the front and back surfaces of the cam gear 6, respectively. FIG. 4 shows the cam groove 61 on the front surface side of the cam gear 6. The cam groove 61 is mainly used for controlling the tape running system, and is formed as a single substantially spiral groove whose diameter from the center of rotation increases successively. This cam groove 61 includes a pin 31 of the pinch roller control lever 15, a pin 32 integrated with the arm 16 for tape tension control, a pin 33 for controlling the reel stand brake, and a pin 34 of the cassette injection lock control lever 37. are engaged with each other. Cam groove 6 shown in FIG.
1 and the above-mentioned pin are at the start position.

1 to 3 and 5, cam grooves 62, 63, 64, 65 are formed on the back side of the cam gear 6 for moving a pair of curved tape loading links 7, 8. has been done.

The link 7 is pivotally connected to the free end of the link 75, and the link 8 is pivotally connected to the free end of the link 85 by pins 7a and 8a. The links 75, 85 are rotatably supported on the base 1 by a common shaft 4, and each link 75, 85 has a short arm 75a, 85a, respectively.
85a is provided with pins 71, 81 which are first engaging portions, and other portions of the links 75, 85 are provided with pins 73, 83 which are second engaging portions.

The state shown in FIG. 1 shows that it is at the start position as in FIG.
Pins 71 and 81, which are first engaging portions, are engaged. The pins 71, 81 are provided so as to be movable in the axial direction of the pins 71, 81 relative to the links 75, 85, and are urged by a spring to move toward the base 1. The base 1 is provided with protrusions 11 and 12 at positions facing the pins 71 and 81, and the protrusions 11 and 12 are connected to the link 7.
The length corresponds to the first half of the movement stroke of the pins 71, 81 as the links 5, 85 rotate, and when the links 75, 85 rotate to a certain extent, the pins 71, 81 come off from the protrusions 11, 12. , pin 7
1 and 81 are moved toward the base 1 by the spring biasing force and come out of the cam grooves 62 and 64.

FIG. 8 shows the relationship between the cam groove 62, the pin 71, and the protrusion 11. The pin 71 is urged toward the base 1 by a spring 74, and the pin 71
1 is in a position facing the protrusion 11, the pin 7
1 rides on the protrusion 11 and the upper end of the pin 71 engages with the cam groove 62. When the pin 71 comes off from the protrusion 11 as the link 75 rotates, the pin 71
Due to the elasticity of the spring 74, the upper end of the pin 71 descends while slidingly contacting the slope of the end of the protrusion 11, and the upper end of the pin 71 comes out of the cam groove 62. The relationship between the other cam groove 64, pin 81, and protrusion 12 is also configured to be similar to that shown in FIG. As the cam gear 6 rotates, the links 75 and 85 rotate, and when the pins 71 and 81 reach a position where they are about to come off the protrusions 11 and 12, as shown in FIG. The pins 73, 83, which are the second engaging parts of the links 75, 85, come to face the open ends of the cam grooves 63, 65, which are the second cam parts of the cam gear 6,
When the cam gear 6 further rotates, the pins 73 and 83 engage with the cam grooves 63 and 65, respectively.

As shown in FIG. 3, tape guides 35 and 36 are attached to pins 7 and 7 at the ends of the links 7 and 8, respectively.
b and 8b, respectively. The tape guides 35 and 36 are provided with vertical balls, inclined balls, etc., as is well known.

Guide grooves 38 and 39 are formed in the main chassis 10 on both sides of the rotating cylinder head 43, and when the links 7 and 8 move, the tape guide 3
5 and 36 move while being guided by guide grooves 38 and 39, respectively. The main chassis 10 has a stopper 4 at the end of the guide grooves 38 and 39.
1, 42 are provided, and tape guides 35,
When tape guide 36 reaches the end of its movement stroke, tape guides 35 and 36 come into contact with stoppers 41 and 42, and their subsequent movement is restricted.

Tape guides 35 and 36 are stoppers 41 and 4
In order to prevent excessive force from being applied to the links 7, 8, 75, 85, etc. when they collide with each other, a buffer piece is placed between each tip of the links 7, 8 and the tape guides 35, 36. can be intervened.
FIG. 10 shows an example in which a buffer piece 90 is interposed between the link 7 and the tape guide 35. Buffer piece 9
0 is partially pivotally connected to the link 7 by a pin 90a, and a tape guide 35 is attached to the free end of the link 7 by a pin 90a.
It is provided in b. A tension spring 91 is interposed between the link 7 and the buffer piece 90, and the tension spring 91 is fixed at one end to the link 7 and at the other end to the buffer piece 90, and the tape guide 35 is connected to the stopper 41 (the ninth
After colliding with link 7 (see figure), link 7
5, the abutment piece 90 and the link 7 can bend against the force of the spring 98, as shown in FIG. Such a buffer means is similarly provided between the other links 8 and the tape guide 36.

Next, the operation of the above embodiment will be explained. The state shown in FIG. 1, FIG. 3, and FIG. 4 is the start position, that is, the state before tape loading is performed. 81 is the first cam groove 6 of the cam gear 6
2, 64, the link 75 is clockwise in FIGS. 1 and 3, and the link 85
is at the limit of rotation in the counterclockwise direction, and tape guide 3
5 and 36 are located at the starting ends of the guide grooves 38 and 39.
In this state, when the motor 20 is driven,
The drive gear 9 is rotationally driven through the pulley, belt, and gear train, and the cam gear 6 is rotationally driven clockwise in FIG. 1. As shown in FIG. 5, since the first cam grooves 62 and 64 of the cam gear 6 are circular arcs with the same diameter in a certain range from the starting position, the 7
1 and 81 remain unchanged, and the positions of links 7 and 8 and tape guides 35 and 36 also remain unchanged. On the other hand, in FIG. 4, as the cam gear 6 rotates during this period, the pin 34 is first moved by the lift part of the cam groove 61 formed on the front side of the cam gear 6, and the lever 37 is rotated counterclockwise. The inject lock operation is performed to prevent the tape cassette from being injected. Subsequently, the pin 33 is moved by the cam groove 61, and the brake applied to the reel stand is released.

FIG. 6 shows that the pins 71 and 81 are in the first cam groove 6.
2 and 64, and in this state, the links 75 and 8 are still engaged.
5, 7, and 8 have not moved. However, when the cam gear 6 is further rotated clockwise, the pin 7
1 and 81 engage with the lift portions of the cam grooves 62 and 64, the link 75 is rotated counterclockwise and the link 85 is rotated clockwise. this link 7
The links 7 and 8 are moved by the rotation of the tape guides 35 and 36, and the tape guides 35 and 36 are moved into the guide grooves 38 and 3.
Move while being guided by 9.

In this way, due to the rotation of the cam gear 6, the link 75,
85 rotates to a certain extent, the pins 73, 83, which are the second engaging parts of the links 75, 85, approach the cam gear 6 and engage the second cam grooves 63, 65, as shown in FIG. It faces the open end and enters the cam grooves 63, 65 from this open end. When the cam gear 6 rotates further, the first cam grooves 62, 64 in which the pins 71, 81 engage come to an end.
However, as shown in FIGS. 7 and 8, when the links 75, 85 rotate to a certain extent, the pins 71, 81 are separated from the protrusions 11, 12 and lowered by the spring biasing force, and the cam grooves 62, 63, and the engagement relationship between the cam gear 6 and the pins 71, 81 is released. Therefore, when the cam gear 6 continues to be rotationally driven, the links 75,
85 is continued to be rotated, and the tape guide 35,
36 will also continue to be moved. In this way, the tape guide 3 is finally assembled as shown in FIG.
5 and 36 are moved until they come into contact with stoppers 41 and 42 and are regulated in position, the rotation angle of the cam gear 6 is detected as the number of pulses by a detection mechanism (not shown), and the rotation of the motor 20 is stopped. As is well known, the above-described movement of the tape guides 35 and 36 causes the tape to be pulled out from the cassette and brought into contact with the cylinder head 43, a so-called tape loading operation.

When the tape loading operation is thus completed, the pin 31 is moved by the cam groove 61 shown in FIG.
5 rotates, and the pinch roller is brought into pressure contact with the capstan shaft. Also, the cam groove 61 allows the pin 32 to
is moved, the arm 16 rotates, and the tension arm becomes operational.

When returning to the original position from the tape loading state, the cam gear 6 is reversed by reversing the motor 20 to perform an operation opposite to that during tape loading.

In the illustrated embodiment, the first cam part and second cam part of the cam body are concave, and the first engaging part and second engaging part of the tape loading link are convex. However, the first and second cam parts of the cam body may be convex and the first and second engaging parts of the tape loading link may be concave, or the first cam part may be concave and the first cam part may be concave. The engagement portion may be convex, the second cam portion may be convex, and the second engagement portion may be concave.

(Effect of the invention) According to the invention, the cam body that drives the tape loading link has a first cam part and a second cam part, and the first cam part has the first cam part of the link. After the link is moved by engaging the engaging portion, the second engaging portion of the link is further engaged with the second cam portion to further move the link. Even if the tape loading link is directly driven by the body, the stroke of the link can be made sufficiently large, and a lever or the like is interposed between the cam body and the tape loading link. Therefore, it is possible to provide a tape loading device that has fewer parts, occupies less space, and can be downsized. Further, since there is no need to three-dimensionally connect sector gears, etc., it is possible to reduce the thickness.

[Brief explanation of drawings]

Fig. 1 is a plan view showing the main parts of the embodiment of the present invention, Fig. 2 is a partially sectional front view showing the vertical overlapping relationship of the above main parts, and Fig. 3 shows the whole of the above embodiment. FIG. 4 is a plan view showing the configuration of the front side of the cam gear in the above embodiment, FIG. 5 is a plan view showing the configuration of the back side of the cam gear in the above embodiment, and FIG. Fig. 7 is a plan view of the main part showing different operating modes;
FIG. 8 is a longitudinal sectional view showing the relationship between the first cam part and the first engaging part in the above embodiment, FIG. 9 is a plan view showing a further different operating mode of the above embodiment, and FIG.
This figure is a plan view showing an example of a buffer device interposed between a tape guide and a link, and FIG. 11 is a plan view of essential parts showing an example of a conventional tape loading device. 6... Cam gear as a cam body, 7, 8... Link for tape loading, 62, 64... First
cam portion, 63, 65...second cam portion, 71,
81...Pin as a first engaging part, 73, 83
...A pin as a second engaging part.

Claims (1)

[Scope of utility model registration request] A tape loading device comprising a cam body driven by a motor and a tape loading link that is moved by rotation of the cam body to load the tape, wherein the cam body is connected to a first The link has a cam part and a second cam part, and the link has a first engaging part that engages with the first cam part of the cam body to move the link;
and a second engaging part that engages with a second cam part of the cam body to further move the link after the link moves due to engagement between the engaging part and the first cam part. A tape loading device characterized by: