JPH0561827U - Detection lever for preventing accidental erasure of VTR - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent deformation of the detection lever for erroneous erasure prevention and to prevent the detection lever from being pushed too far toward the switch. [Structure] The arm portion 2 that abuts against the accidental erasure prevention claw forming portion of the cassette and the other arm portion 3 that abuts against the switch are divided into two parts. 3 was connected by a spring 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an erroneous erasure prevention detection lever of a VTR that detects the presence or absence of an erroneous erasure prevention claw of a VTR cassette.

[0002]

[Prior Art]

 The VTR is designed so that the cassette is loaded into the device by the operation of the cassette loading mechanism. After this loading, a detection mechanism for activating an erasable cassette is activated.

As shown in FIGS. 5 to 8, this detection mechanism is composed of an erroneous erasure prevention detection lever 60 and a switch 70. The detection lever 60 has arm portions 62 and 63 extending in two directions from the cylindrical portion 61. The cylindrical portion 61 is pivotally supported by the printed circuit board 100, and the protruding portion 62a of the one end side arm portion 62 is provided. The arm portion 62 is urged and attached to the cassette 50 side by urging means (not shown) whose one end is locked.

When the accidental erasure prevention claw 51 is present in the loaded cassette 50, the tip projection 62b of the one end side arm part 62 should contact the claw 51 as shown in FIGS. By this, the detection lever 60 rotates in the opposite biasing direction (direction a), and the tip end portion 63a of the other end side arm portion 63 collides with the switch 70 to set to the non-erasable mode.

On the other hand, when the accidental erasure prevention claw 51 is removed from the loaded cassette 50, the claw 51 is removed from the tip projection 62b of the one end side arm 62 as shown in FIGS. 7 and 8. When the detection lever 60 is rotated in the biasing direction by entering the recess 52 of the cassette, the tip end 63a of the other end side arm 63 is separated from the switch 70 and set to the erasable mode.

[0006]

[Problems to be solved by the device]

 However, in the conventional VTR, the cassette 50 is not always accurately positioned and loaded, and when the cassette 50 is loaded with the position shifted to the loading port side (rear side), the detection lever 60 causes the cassette 50 and the switch 70 to move. There is a possibility that it may be deformed by pushing between them and that the switch 70 is pushed too much, resulting in a failure.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to prevent erroneous erasure so that an unreasonable load is not applied even when a cassette is loaded while being displaced to the rear side. To provide a detection lever.

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention has a central portion pivotally supported by a printed circuit board, and a tip of an arm portion at one end abuts on a portion of a loaded cassette where an erroneous erasure prevention claw is formed, and the other end In the detection lever for erroneous erasure prevention, in which the tip of the side arm part turns on and off the detection switch depending on the presence or absence of the claw, the one end side arm part and the other end side arm part are divided, and both arm parts are pivotally supported. It is characterized in that one end side arm part is pivotally supported on the printed circuit board, and both arm parts are connected by a spring to be integrated.

[0009]

[Action]

 In the erroneous erasure prevention detection lever of the present invention, the one end side arm portion and the other end side arm portion are connected by a spring to act integrally. Then, when the cassette is loaded with the position shifted to the rear side, an abnormal load is generated on the detection lever, but this abnormal load is absorbed by the one end side arm rotating against the biasing force of the spring. To be done.

[0010]

【Example】

 Hereinafter, the present invention will be described in detail based on illustrated embodiments. FIG. 1 shows a detection lever 1 for preventing erroneous erasure according to the present invention. The detection lever 1 is divided into an arm portion 2 on one end side and an arm portion 3 on the other end side, and these arm portions 2 and 3 are combined by being connected by a spring 4.

The one end side arm portion 2 includes a cylindrical portion 21, an arm 22 extending from the upper portion of the cylindrical portion 21 to one side, an action arm 23 extending upright from the tip of the arm 22, It is generally configured by a support plate 24 extending from the lower portion of the cylindrical portion 21 to the other. A tip projection 25 having a sliding contact surface 25a with which the cassette slides when the cassette is loaded is formed at the tip of the working arm 23, and the support plate 24 has a hook portion with which one end of the spring 4 is locked. 24a is formed.

The other end side arm part 3 is roughly composed of a cylindrical part 31, an arm 32 extending from the lower part of the cylindrical part 31 to one side, and a lock arm 33 extending from the lower part of the cylindrical part 31 to the other side. It is configured. An operating end 34 to the switch is extended at the tip of the arm 32, and a hook portion 32a to which the other end of the spring 4 is locked is formed at an intermediate side portion thereof.

As shown in FIG. 1, the both arm portions 2 and 3 pivotally support the cylindrical portion 31 of the other end side arm portion on the support plate 24 of the one end side arm portion, and The tip portion 33a of the rock arm 33 contacts the intermediate side portion of the cylindrical portion 21, and the two arms 3 and 2 are assembled so that mutual rotation of the arms 2 and 3 is restricted despite the biasing force of the spring 4.

As shown in FIGS. 2 and 3, the detection lever 1 for preventing erroneous erasure assembled in this manner has its cylindrical portion 21 pivotally supported by a support shaft (not shown) provided upright on the printed circuit board 100. Installed. In the detection lever 1 attached in this manner, one end of a biasing means (not shown) is locked to a hook portion 2a formed on the one end side arm portion 2, and the one end side arm portion 2 is set by the biasing means. It is in a state of being biased toward the 50 side. In the figure, reference numeral 5 indicates a deck chassis.

The erroneous erasure prevention detection lever 1 assembled in the VTR in this way operates in the same manner as the conventional one when the cassette 50 is loaded in the normal position. That is, the cassette 50 is loaded while slidingly contacting the sliding contact surface 25a at the tip of the working arm 23, and after loading, the erroneous erasure prevention claw 51 of the cassette 50 is mounted on the tip projection of the working arm 23 of the one end side arm portion. When 25 touches, the detection lever 1 rotates in the anti-biasing direction, and the operating end 34 of the arm portion on the other end collides with the switch 70 to set the non-erasable mode.

When the claw 51 is removed, although not shown, like the conventional one, the tip projection 25 of the working arm 23 (arm on one end side) is detected by entering into the recess 52 of the cassette. The lever 1 rotates in the urging direction, and the operation end 34 of the arm portion on the other end side moves away from the switch 70 to set the erasable mode.

Further, when the cassette 50 is loaded while being displaced rearward, the tip projection 25 of the action arm 23 is located at a position where the one-end side arm 2 is rotated in the direction a from the position shown in FIG. Comes into contact with the accidental erasure prevention claw 51 of the cassette. In this state, the one end side arm part 2 is rotating in the a direction around the cylinder part 21, and the tip end part 33a of the lock arm 33 (the other end side arm part) is separated from the cylinder part 21. The spring 4 is pulled by increasing the separation distance between the hook portion 24a of the one end side arm portion and the hook portion 32a of the other end side arm portion, and the pulling force at this time absorbs the abnormal load of the one end side arm portion 2. As a result, the deformation of the detection lever 1 is prevented and the push of the switch 70 is prevented.

[0018]

[Effect of the device]

 As described above, according to the present invention, when the cassette is loaded in the normal position, the same effect as the conventional integrally formed erroneous erasure detection lever is exerted, and the cassette is moved to the abnormal position (rear position). When it is loaded in the (shifted position), the abnormal load of the arm on the one end side is absorbed by the bending of the spring, so that the deformation of the detection lever and the over-pressing of the switch are prevented, and normal operation can be secured.

[Brief description of drawings]

FIG. 1 is a perspective view of an erroneous erasure prevention detection lever of the present invention.

FIG. 2 is a side view of an essential part of the VTR of the present invention.

FIG. 3 is a plan view of an essential part of a VTR of the present invention.

FIG. 4 is a side view taken along arrow Z in FIG.

FIG. 5 is a plan view of a main part of a conventional VTR.

FIG. 6 is a plan view of a main part of a conventional VTR.

FIG. 7 is a side view of a main part of a conventional VTR.

FIG. 8 is a plan view of a main part of a conventional VTR.

[Explanation of symbols]

 1 Accidental erasure prevention detection lever 2 One end side arm part 3 Other end side arm part 4 Spring 50 Cassette 51 Accidental erasure prevention claw 70 Switch 100 Printed circuit board

Claims (1)

[Scope of utility model registration request] 1. A center portion is pivotally supported by a printed circuit board, a tip of one end side arm portion abuts a portion of a loaded cassette where erroneous erasure prevention claws are formed, and a tip end of the other end side arm portion is aforesaid. In a detection lever for preventing erroneous erasure that turns a detection switch on and off depending on the presence or absence of a claw, the one end side arm part and the other end side arm part are divided, and both arm parts are pivotally supported and connected, and one end side arm part A detection lever for erroneous erasure prevention of a VTR, characterized in that the above is pivotally supported on a printed circuit board, and both arms are connected by springs to be integrated.