JPH0559623U - Cassette tape recorder - Google Patents

Abstract

(57) [Summary] [Purpose] The release operation of the detection switch 71 and the cassette door
The opening operation of 31 is integrally linked. [Structure] A lock arm 42 for locking the cassette door 31 in a closed state is provided. A detection switch 71 that engages with the cassette tape 33 and detects cassette information is provided. A release arm 81 for pushing up the detection switch 71 to release the engagement with the cassette tape 33 is provided. A cam mechanism 54 that integrally connects the lock arm 42 and the release arm 81 is provided. The cam mechanism 54 interlocks with the rotation of the lock arm 42 in the unlocking direction to rotate the release arm 81 in the engagement releasing direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cassette tape recorder, and more particularly to a cassette tape information detection switch release mechanism that is interlocked with a cassette door opening / closing mechanism.

[0002]

[Prior Art]

 In cassette tape recorders that play and record cassette tapes, a cassette door that stores the cassette tape is provided on the front of the cassette storage unit so that the cassette door can be opened and closed, and the cassette door is locked in the closed state and locked by an eject operation. A cassette door opening / closing mechanism for releasing and opening the door is provided.

Further, a detection switch for detecting the presence / absence of a concave portion provided on the upper part of the cassette half is provided in order to detect the cassette tape information such as recording prevention and tape type.

By the way, when the cassette door is opened by the eject operation, if the front end of the detection switch is fitted in the recess of the cassette half, the cassette door is opened and the cassette door is opened. It is necessary to release the tip of the detection switch from the fitting state by interlocking with.

FIG. 6 shows a conventional release mechanism for releasing the detection switch in conjunction with the opening of the conventional cassette door. When the cassette door (not shown) accommodating the cassette tape 1 is closed and the tip 3a of the detection switch 3 is fitted in the recess 2a in the upper part of the cassette half 2 of the cassette tape 1, the eject button 4 Is operated to push up the operating plate 6 through the rotating member 5, the operating plate 6 swings the push-up lever 7 upward, and the push-up lever 7 swings the detection switch 3 upward. The leading end 3a of the detection switch 3 is released upward from the recess 2a of the cassette half 2, and at the same time, the cassette door is opened by another opening / closing mechanism.

[0006]

[Problems to be solved by the device]

 However, in the structure of the conventional release mechanism, since the operating plate 6 and the like that interlock with the operation of the eject button 4 are provided separately from the opening / closing mechanism of the cassette door, the man-hours, workability, cost, and It is not always satisfactory in terms of error and a certain allowance for movement (play).

In particular, since the entire operation plate 6 is pushed up in the vertical direction by the horizontal operation of the eject button 4, the operation force of the eject button 4 is large, and the operation of the eject button 4 causes the detection switch 3 to be released. There is a problem that the ejecting operability is not good because the timing of the series of releasing operations and the timing of opening the cassette doors do not match.

The present invention has been made in view of the above circumstances, and enables the detection switch to be released with a small operation force, and the release operation of the detection switch and the opening operation of the cassette door are linked to each other. It is an object of the present invention to provide a cassette tape recorder which can surely match the operation timings and improve the eject operability.

[0009]

[Means for Solving the Problems]

 The present invention locks the cassette door 31 that opens and closes the front surface of the cassette storage unit 29 to the closed state, and also locks the lock arm 42 that rotates in conjunction with the eject operation that opens the cassette door 31 to release the lock. It has a cassette door opening / closing mechanism 41, a detection switch 71 that engages with the cassette tape 33 stored in the cassette storage section 29 when the cassette door 31 is closed, and a cassette switch 33 that detects cassette information. The lock arm 42 for locking the lock arm 42 is provided with a release arm 81 for releasing the engagement with the storage tape 33, and a cam portion 55 provided on one of the lock arm 42 and the release arm 81 and a pin 86 for engaging the cam portion 55 on the other. The cam mechanism 54 connects the release arm 81 rotatably in the engagement release direction in conjunction with the rotation in the release direction.

[0010]

[Action]

 In the present invention, the eject operation causes the lock arm 42 of the cassette door opening / closing mechanism 41 to rotate in the unlocking direction, and at the same time, the release arm 81 that is interlocked with the rotation of the lock arm 42 is engaged via the cam mechanism 54. Rotate in the release direction. Therefore, a predetermined timing is performed for the opening operation in which the cassette door 31 is unlocked and the cassette door 31 is opened, and the release operation in which the detection switch 71 is released from the engagement with the cassette tape 33. ..

[0011]

【Example】

 Hereinafter, a configuration of an embodiment of the present invention will be described with reference to FIGS.

In the figure, reference numeral 11 denotes a chassis body, which is assembled in a frame shape from a front plate 12, a rear plate 13, an end plate 14 and the like, and a capstan protruding from the front plate 12 is provided inside. A drive mechanism (not shown) for driving the shaft 15 and a reel (not shown) is provided, and a motor 16 as a drive source of the drive mechanism is provided on the rear surface of the rear plate 13.

Next, 21 is a panel frame, and this panel frame 21 includes a rear surface portion 22 fixed to the front surface of the chassis body 11, an upper surface portion 23 continuously provided on the upper portion of the rear surface portion 22, and the chassis body 11. It is integrally formed from a lower surface part 25 connected to the lower part of the front surface via connecting metal fittings 24, end surface parts 26 on both end surfaces, and a front panel part 28 having an opening 27 in the upper area, and an empty cassette storage part 29 inside. A space is formed.

Next, 31 is a cassette door, and this cassette door 31 is a holder that allows a door panel portion 32 that can close the front surface of the opening 27 of the front panel portion 28 and a cassette tape 33 that can be inserted and removed from above. The holder 34 includes a leg portion 35 projecting downward from both ends of the holder portion 34, and a support shaft 36 provided on the leg portion 35 is rotatably supported by the lower surface portion 25 of the panel frame 21. It is supported so that it can be opened and closed with the support shaft 36 as a fulcrum.

A coil portion 38a of a spring 38 is fitted to a boss 37 projecting on the outer end surface of one leg portion 35, and one end protruding from this coil portion 38a projects on the outer end surface of the holder portion 34. The other end is connected to a spring receiving portion 40 provided on the back surface portion 22 of the panel frame 21, and the elastic force of the spring 38 constantly biases the cassette door 31 in the opening direction. The cassette door 31 is rotated in the opening direction gently by the action of a damper (not shown).

Next, 41 is a cassette door opening / closing mechanism, which has a lock arm 42. In this rock arm 42, a base plate portion 45 is rotatably supported by a shaft support body 44 fixed to the outer surface of the end plate 14 of the chassis body 11 by a screw 43. A lock piece portion 46 that protrudes forward in a crank shape is formed at the front edge portion of the base plate portion 45, and an engaging member that is provided on the outer end surface of the holder portion 34 of the cassette door 31 at the tip of the lock piece portion 46. A claw portion 48 that can be engaged and disengaged is formed on the front surface of the stop protrusion portion 47.

Further, a lower plate portion 49 is formed at the lower edge of the substrate portion 45, and an elongated hole 50 is formed in the lower plate portion 49 in an upward and downward direction. The spring 51 is constantly urged to rotate counterclockwise in the figure, and the rear edge of the spring 51 contacts the stopper 52 projecting from the chassis body 11 to restrict the rotation. ing.

Further, an upper plate portion 53 is formed on the upper edge portion of the base plate portion 45, and a cam hole 55 as a cam portion of the cam mechanism 54 is provided in the upper plate portion 53. As shown in FIG. 5, the cam hole 55 has a long hole shape, and the rear side (right side in the drawing) is formed in a steeply inclined hole portion 56, and the front side (left side in the drawing) is gentle. It is formed in the inclined hole portion 57.

The cassette door opening / closing mechanism 41 has an eject knob 61 and a swing arm 62 as eject means. The eject knob 58 is formed in an elongated rod shape, the operation portion 63 at the front end is inserted into a protruding state from a through hole 64 provided in the front panel portion 28, and the convex shaft portion 65 at the rear end is connected to and supported by the swing arm 62. It is installed horizontally so that it can move horizontally. Further, the swing arm 62 is formed in a vertically long shape, and a center portion thereof is rotatably supported by a shaft support body 67 fixed to the outer surface of the end plate 14 of the chassis body 11 by a screw 66, and an upper end portion thereof is an end. A pin 68 provided between the plate 14 and the lock arm 42 and provided at the upper end thereof is fitted into the long hole 50 of the lock arm 42, and a convex shaft portion of the eject knob 58 is fitted to a fitting piece portion 69 provided at the lower end. 65 is connected in the inserted state.

The swing arm 62 is adapted to rotate interlockingly with the lock arm 42 in the opposite direction by the engagement of the elongated hole 50 and the pin 68, and therefore biases the lock arm 42. The spring 51 urges the swing arm 62 in the clockwise direction in the figure, and pushes the eject knob 58 forward.

Next, 71 is a detection switch, and a base 73 is provided on the front surface of a substrate 72 vertically arranged on the upper inside of the chassis body 11, and a pair of upper and lower elastic contact plates 74 are provided from the base 73. Is attached to the lower surface of the tip of the lower contact plate 74, and a substantially triangular detection claw 75 that can be engaged with the recess 33b that is in contact with or opened on the upper surface of the cassette half 33a of the cassette tape 33 is attached. A cover 76 is attached to the upper contact plate 74, the lower surface of which is open and the side faces of the upper and lower contact plates 74 are surrounded. A plurality of the detection switches 71 are provided corresponding to the plurality of tape information display positions of the cassette half 33a.

When the detection pawl 75 contacts the upper surface of the cassette half 33a, the tip of the lower contact plate 74 is pushed up and joined to the upper contact plate 74, and the detection pawl 75 is inserted into the cassette half 33a. The upper and lower contact plates 74 are separated from each other when the contact plates 74 are engaged with the recess 33b, and cassette information such as recording prevention and tape type is detected according to the contact and separation states of the upper and lower contact plates 74.

Next, 81 is a release arm, and this release arm 81 is rotatably supported by a shaft support 83 fixed to the outer surface of the end plate 14 of the chassis body 11 by a screw 82, and its tip end is A bent piece portion 84 that is arranged between the end plate 14 and the lock arm 42 and is bent from the tip portion thereof to enter the inside of the chassis body 11 is formed. From this bent piece portion 84, a substantially L shape is formed. The push-up piece portion 85 that is bent to allow the detection switch 71 to be pushed up is bent.

A pin 86 of the cam mechanism 54 is provided on the release arm 81 so that the release arm 81 can move in the same direction as the lock arm 42 by fitting the pin 86 and the cam hole 55 of the lock arm 42. The unlocking arm 81 is biased counterclockwise in the figure by the spring 51 that biases the lock arm 42.

Next, the operation of this embodiment will be described.

On the upper part of the cassette half 33a of the cassette tape 33, a recess 33b corresponding to cassette tape information such as recording prevention and tape type is provided.

Then, in order to set the cassette tape 33 in the cassette tape recorder, as shown in FIG. 4, with the cassette door 31 opened, the cassette tape 33 is inserted into the holder portion 34 from diagonally above, and the cassette By manually pushing the door 31 in the closing direction, the locking projection 47 of the cassette door 31 abuts on the lock piece 46 of the lock arm 42, and the lock arm 42 rotates clockwise in the figure. Then, when the locking projection 47 gets over the claw 48 of the lock piece portion 46, the lock arm 42 is rotated counterclockwise in the figure by the elasticity of the spring 51, and as shown in FIG. The claw portion 48 of the portion 46 engages with the front surface of the locking projection 47, and the cassette door 31 is locked in the closed state.

In this set state, the cassette tape 33 is held at a predetermined reproduction / recording position in the cassette storage section 29, and the detection claw 75 of the detection switch 71 is engaged in the concave portion 33b of the cassette half 33a so that the upper and lower portions are The contact plate 74 is separated, and it is detected that it is in a recording prevention state, for example. If a recordable claw piece is present at the opening position of the recess 33b, the detection claw 75 abuts on the claw piece, and the tip of the lower contact plate 74 is pushed up to push the upper contact plate 74. It is detected that it is in a recordable state.

On the other hand, when the cassette tape 33 is taken out from the cassette tape recorder, by pushing the operation portion 63 of the eject knob 61, as shown in the order of FIG. 2 and FIG. While rotating in the counterclockwise direction, the lock arm 42 rotates in the clockwise direction in the figure integrally with it, and the claw portion 48 of the lock piece portion 46 moves upward with respect to the locking projection 47. Go off.

At the same time, the release arm 81 rotates in the clockwise direction in the figure integrally with the rotation of the lock arm 42 via the cam mechanism 54, and the push-up piece portion 85 of the release arm 81 The detection switch 71 is pushed upward. At this time, the cam mechanism 54 pushes up the pin 86 by the steeply inclined hole portion 56 of the cam hole 55 in the initial stage of the rotation of the lock arm 42, so that the rotation amount of the release arm 81 is large, that is, the release arm 81 is released. The rotation speed of the arm 81 is fast, and the push-up piece 85 abuts on the lower surface of the detection switch 71 early, the detection switch 71 is pushed up early, and the pawl 48 is detected before it disengages from the locking projection 47. The claw 75 is removed upward from the recess 33b of the cassette half 33a. Further, in the subsequent rotation of the lock arm 42, the pin 86 is fitted into the hole portion 57 having a gentle inclination, so that the rotation of the release arm 81 becomes gentle and the detection switch 71 is gently pushed up.

Then, when the claw 48 is disengaged from the locking projection 47, the cassette door 31 is rotated in the opening direction by the elasticity of the spring 38 and is gently moved by the action of a damper (not shown) as shown in FIG. It is rotated.

The cam hole 55 of the cam mechanism 54 may be provided in the release arm 81 and the pin 86 may be provided in the lock arm 42. Further, the cam portion is not limited to the cam hole 55, but may be a cam protrusion having a circumferential surface as a cam surface.

[0033]

[Effect of the device]

 According to the present invention, the release arm is integrally connected to the lock arm that locks the cassette door in the closed state via the cam mechanism, so that the lock arm is interlocked with the rotation in the lock release direction accompanying the eject operation. Since the release arm rotates in the engagement release direction, the engagement of the detection switch from the cassette tape can be released with a small operation force, and the release operation of the detection switch and the opening operation of the cassette door are performed. By linking with and, the timing of those operations can be surely matched, and the eject operability can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view of a cassette tape set state showing an embodiment of a cassette tape recorder of the present invention.

FIG. 2 is a cross-sectional view during the ejecting operation.

FIG. 3 is a cross-sectional view in the middle of the eject operation.

FIG. 4 is a sectional view of an opened state of a cassette door.

FIG. 5 is a side view of a cam portion.

FIG. 6 is a side view showing a conventional mechanism.

[Explanation of symbols]

 29 Cassette storage section 31 Cassette door 33 Cassette tape 41 Cassette door opening / closing mechanism 42 Lock arm 54 Cam mechanism 55 Cam section 71 Detection switch 81 Release arm 86 pin

Claims (1)

[Scope of utility model registration request] 1. A cassette door opening / closing mechanism having a lock arm that locks a cassette door that opens and closes the front surface of the cassette housing portion in a closed state, and that has a lock arm that rotates in conjunction with an eject operation that opens the cassette door to release the lock. A detection switch that engages with the cassette tape stored in the cassette storage portion to detect cassette information when the cassette door is closed; and a release arm that pushes up the detection switch to release the engagement with the cassette tape, A cam part is provided on one of the lock arm and the release arm, and a pin that engages with the cam part is provided on the other side, and the release arm can be rotated in the engagement release direction in conjunction with the rotation of the lock arm in the lock release direction. A cassette tape recorder having a cam mechanism connected to the.