JP2802534B2 - Tape cartridge - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a tape cartridge provided with status identification means for displaying status information on a tape cartridge side, such as erroneous erasure prevention means. Is a switching type.

2. Description of the Related Art It has been known in Japanese Utility Model Laid-Open Publication No. Sho 62-188881 that in this type of tape cartridge, the state discriminating means is switched up and down to show a recordable state and a record prohibited state of a magnetic signal. is there.

As shown in FIG. 9, the state identification means includes a key-shaped identification tool 40 and a spring 41 for pushing up and urging the identification tool 40. The spring 41 and the identification tool 40 are provided with an identification hole provided in the main body case 42. Built into 43. At the lower end of the identification tool 40, an engagement protrusion 44 is provided to protrude laterally. The identification hole 43 is composed of a guide hole 45 on the upper case side and a detection hole 47 on the lower case side into which the detection pin 46 on the tape deck side is inserted. It is provided in.

When the engagement protrusion 44 is received by the lower receiving step portion 49, the identification tool 40 prevents the detection pin 46 from entering and allows recording of a magnetic signal. The engaging projection 44 is the upper receiving step
In a state in which the detection signal is received by 48, the detection pin 46 is retracted from the entry area and the recording of the magnetic signal is prohibited.

In such a conventional state identification means, as shown in FIG. 9, a disengagement stopper 50 is protruded from the upper end of the engagement protrusion 44, and this is formed with a receiving part 51 protruding from a lower receiving step 49. In some cases, the contact engagement prevents the engagement protrusion 44 from shifting laterally and maintains an appropriate switching posture.

[Problems to be solved by the invention]

Between the identification tool 40 and the guide hole 45, there is a play gap for smoothing the switching operation (up and down operation and rotation operation) of the identification tool 40, and there is a slight play. Due to this backlash and variations in the molding dimensions of the discriminator 40 and the discriminating hole 43, the whole is inclined obliquely in the process of switching the discriminator 40 to the recordable state, and as shown in FIG. Is the receiving part
There was a case where I got on the 51 side edge. In this state, the detection pin 46 cannot be received correctly, which hinders the loading operation of the tape cartridge. In some cases, as shown in FIG. 10, the detection pin 46 may squeeze laterally so as to push the engagement projection 44 away, making it impossible to record a magnetic signal.

Therefore, an object of the present invention is to improve the reliability of the state identification means by reliably guiding the engagement protrusion to the appropriate switching position and ensuring the switching of the identification tool even when the switching state of the identification tool is incomplete. It is in.

[Means for solving the problem]

According to the present invention, as shown in FIG. 1, an identification hole 11 is provided in the main body case 1 in a vertically penetrating manner, and an identification tool 12 for displaying status information of the tape cartridge is provided in the identification hole 11, and the identification tool 12 is urged upward. The identification tool 12 is operated so as to move up and down and rotate in the identification hole 11, and the detection pin C enters the detection hole 18 provided below the identification hole 11. It is possible to switch between an operation state that blocks the area and a standby state that retreats outside the entrance area, provided at the lower end of the identification tool 12 in each of the switching states in the inner and middle portions of the detection hole 18. Receiving step portions 19 and 20 for receiving and supporting the engagement projection 16 are provided between at least the lower receiving step portion 20 and the upper surface of the engagement projection 16 received and supported by the step portion 20; In addition, a receiving portion 21 and a slip preventing portion 22 that come into contact with each other to prevent the engaging projection 16 from shifting laterally are provided. Are provided on at least one contact surface of the receiving portion 21 and the slip preventing portion 22,
It is required that an inclined guide surface 23 for guiding and guiding the engagement protrusion 16 to an appropriate switching posture is formed.

[Action]

In a state in which the slip stopper 22 of the engaging projection 16 is hooked on the receiving part 21 of the receiving step part 20, the slip stopper 22 and the receiving part 21 are connected via the inclined guide surface 23 provided on at least one of them. I'm in contact. In addition, the entire identification tool 12 is constantly pushed up and urged by the spring 13. Therefore, a lateral component force is generated on the inclined guide surface 23, and the engagement protrusion 16 is guided and guided to an appropriate switching posture.

〔The invention's effect〕

In the present invention, since the inclined guide surface 23 is provided on at least one of the contact surfaces between the slip prevention portion 22 of the engagement protrusion 16 and the receiving portion 21 of the receiving step portion 20, the entire discrimination tool 12 is inclined and the switching is performed. Even if it is not possible to perform the operation completely, a lateral component force is generated between the inclined guide surface 23 and the surface wall that comes into contact with the inclined guide surface 23, and the engagement protrusion 16 can be guided and guided to an appropriate switching posture. As a result, the switching operation of the identification tool 12 is ensured, the state information of the tape cartridge is accurately displayed, and a loading error due to an incomplete switching of the identification tool 12 and a detection error of the state of the tape deck are eliminated. 8 can be improved in reliability.

First Embodiment FIGS. 1 to 6 show a first embodiment in which the present invention is applied to a tape cartridge for video.

In FIGS. 5 and 6, reference numeral 1 denotes a main body case in which upper and lower cases 1a and 1b made of plastic are connected in a lid-like manner, and a tape reel 3 on which a tape 2 is wound around the inside of the main body case 1. 3 is arranged, and the tape 2 pulled out from one tape reel 3 is wound on the other tape reel 3 via tape guides 4 provided on the right and left of the front surface of the case. Left and right tape guides 4.4
Between them, a pocket 5 for tape loading is recessed. A front cover 6 for protecting the tape is arranged so as to cover the front and top surfaces of the pocket 5, and the front cover 6 is supported so as to be swingable up and down with respect to the main body case 1.
Reference numeral 7 in FIG. 6 denotes a drive shaft insertion hole opened on the bottom wall of the case corresponding to each tape reel 3.3.

On the triangular bottom wall portion of the lower case 1b located at the center of the inside of the pocket 5, state identification means 8 for preventing erroneous erasure is provided.
An identification unit 9 for indicating a tape type is provided. A guide groove 10 for positioning is formed in the outer lower surface of the bottom wall in a front-rear direction.

2 and 3, the state identification means 8 includes a vertically penetrating identification hole 11 provided in the main body case 1, a key-shaped identification tool 12 incorporated in the identification hole 11, and a push-up of the identification tool 12. And a biasing spring 13.

The identification tool 12 is a plastic formed integrally with a screw-shaped operation portion 14, a shaft portion 15 protruding from the lower end surface thereof, and an engagement protrusion 16 protruding laterally from the lower peripheral surface of the shaft portion 15. It is a molded product. The identification hole 11 includes an upper half guide hole 17 that accommodates the operation portion 14 side of the identification tool 12 and a lower half detection hole 18 that accommodates the engagement protrusion 16 side. Receiving step portions 19 and 20 for receiving the engaging projections 16 and maintaining the switching posture of the identification tool 12 are provided at two positions on the rear side and the front side of the middle portion.

As shown in FIG. 2, the engaging projection 16 is
In the posture in which the magnetic signal is recorded on the tape 2, the engagement projection 16 blocks the entry area of the detection pin C on the tape deck side, and the magnetic signal can be recorded on the tape 2. As shown by the imaginary line,
In the posture in which the engaging projection 16 is hooked on the upper receiving step 19,
The engaging projection 16 is retracted from the entry area, and the apparatus enters a standby state in which recording of a magnetic signal on the tape 2 is prohibited. The switching of these states is performed by twisting the operation unit 14 while pushing it against the spring 13 with a driver.

Between the upper and lower receiving step portions 19 and 20, and the upper surface of the engaging protrusion 16, a receiving portion 21 and a slip preventing portion 22 are formed, which are in contact with each other to prevent the engaging protrusion 16 from laterally shifting. Have been. The receiving portion 21 in the drawing provided on the side of the receiving step portions 19 and 20 is formed as a groove. The slip prevention portion 22 formed on the engagement protrusion 16 side is a protrusion that enters the groove of the receiving portion 21. The projecting length of the shift stopper 22 is set slightly smaller than the groove depth of the receiving part 21.

In FIG. 1 and FIG.
Of the contact surfaces, a contact guide surface on the side of the slip prevention portion 22 is provided with an inclined guide surface 23 that rises and inclines toward the front of the case. The inclined guide surface 23 is formed in a state where the standing wall portion 24 is left at the base end of the protrusion of the slip stopper 22. As shown in FIG. 2, when the slip stopper 22 is completely inserted into the receiving portion 21, the upright wall portion 24 comes into contact with the groove side wall of the receiving portion 21 to restrict the lateral displacement of the engaging projection 16. I do.

In FIG. 3, the identification portion 9 is composed of a horizontally long detection groove 26 opened to the bottom wall of the lower case 1b continuous with the detection hole 18 and an identification piece 27 arranged to close the detection groove 26. . The identification piece 27 is incorporated inside the case of the detection groove 26, and is fixed between the upper and lower cases 1a and 1b. Although not shown, a positioning recess for dropping and mounting the identification piece 27 is provided on the inner edge of the opening of the detection groove 26 as a set of two pieces.
A set is provided. The figure shows an example in which the identification pieces 27 are attached to only two of them. Note that the detection pins C provided corresponding to the engagement projections 16 are located at the center of the detection pin row (not shown) provided corresponding to the identification piece 27.

Next, the switching operation of the identification tool 12 will be described. When the recording of the magnetic signal on the tape 2 is prohibited, as shown by the imaginary line in FIG. The identification tool 12 is put on standby by hooking. From this state the identification tool
12 is pushed in against the spring 13 and twisted to the left or right to rotate the engaging projection 16 by 180 degrees, and when the pressing force of the identification tool 12 is released, the slip stopper 22 is in the receiving portion 21. At the same time, the upper surface of the engaging projection 16 contacts the receiving step portion 20 and is switched to the operating state. In this state, since the engagement projection 16 blocks the entry area of the detection pin C, the detection pin C cannot enter the inside of the detection hole 18.

When the entire discrimination tool 12 is inclined in the discrimination hole 11, the stopper 22 may ride on the opening edge of the receiver 21 as shown in FIG. However, the slip stopper 22 is provided with an inclined guide surface 23 on the contact surface with the receiving member 21, and the identification tool 12 is always provided with a spring.
13 push-up forces are acting. Therefore, the inclined guide surface 23
Then, a lateral component force is generated such that the slip stopper 22 is pushed toward the receiving portion 21 side, and the engagement component 16 is guided and guided to an appropriate switching position by this component force, and the switching posture is completely changed. Make things.

Second Embodiment FIG. 7 shows a second embodiment of the present invention in which the position at which the inclined guide surface 23 is formed is changed. In this case, an inclined guide surface 23 is formed on the side of the receiving step portions 19 and 20, that is, the contact surface of the receiving portion 21 with the slip preventing portion 22, and the square slip preventing portion 22 is dropped into the groove and guided. I made it possible. Others are substantially the same as the first embodiment.

Third Embodiment FIG. 8 shows a third embodiment of the present invention in which the form of the inclined guide surface 23 is changed.
In this embodiment, an inverted V-shaped rib 29 is provided on the upper surface of the engagement projection 16, and a V-shaped engagement groove 30 is formed at the center of the rib 29 in the longitudinal direction. Further, a receiving projection 31 that engages with the engaging groove 30 is provided on the receiving step portion 20 side. That is, the inclined guide surfaces 23a and 23b are provided on both the receiving step portion 20 and the engagement protrusion 16.

(Another embodiment example)

The inclined guide surface 23 may be formed only in the lower receiving step portion 20, and may be a projecting arc surface or a concave arc surface.

It is also possible to form the stopper 22 in the first embodiment as a groove, and to form the receiving part 21 as a projection that enters the groove.

Since the identification tool 12 can be used for identification other than prevention of erroneous erasure, the identification content is not limited. For example, it may be used to identify a recording method at the time of signal recording.

[Brief description of the drawings]

1 to 6 show a first embodiment of a tape cartridge according to the present invention. FIG. 1 is an enlarged view of a portion A in FIG. 2, and FIG. 2 is a cross section taken along line BB in FIG. Fig. 3, Fig. 3 is a bottom view of a main part, Fig. 4 is a perspective view showing a detailed structure of an engagement projection, Fig. 5 is a schematic plan view of the whole, and Fig. 6 is a perspective view of the whole seen from the bottom side. It is. FIG. 7 is a longitudinal sectional side view of a main part showing a second embodiment of the tape cartridge according to the present invention. FIG. 8 is a vertical sectional side view of a main part showing a third embodiment of the tape cartridge according to the present invention. 9 and 10 show a conventional example, FIG. 9 is a longitudinal sectional side view of a main part, and FIG. 10 is an enlarged view of a main part of FIG. 9, showing a trouble occurrence state. 8 ... state identification means, 11 ... identification hole, 12 ... identification tool, 13
…… Spring, 16… Engagement projection, 18… Detection hole, 19/20 ……
Receiving step part, 21 ... Receiving part, 22 ... Displacement preventing part, 23 ... Inclination guide surface.

Claims (1)

(57) [Claims] An identification hole (11) is provided in the main body case (1) in a vertically penetrating manner. An identification tool (12) for displaying status information of the tape cartridge is provided in the identification hole (11). ) And a spring (13) that pushes and biases the identification hole (11). The identification tool (12) is operated to move up and down and rotate in the identification hole (11). It is possible to switch between an operation state in which the detection pin (C) enters the entrance area in the provided detection hole (18) and a standby state in which the detection pin (C) retreats outside the entrance area, and the inside and the middle of the detection hole (18). In each of the tape cartridges, in each of the switching states, a receiving step (19, 20) for receiving and supporting an engaging projection (16) provided at a lower end of the identification tool (12) is provided. Receiving step (20) and said receiving step (20)
Between the upper surface of the engaging projection (16) received and supported by
A receiving portion (21) and a slip preventing portion (22) are provided respectively for abuttingly engaging each other to prevent the engaging projection (16) from shifting laterally. The tape cartridge according to claim 1, wherein an inclined guide surface (23) for guiding the engagement protrusion (16) to an appropriate switching posture is formed on at least one contact surface of the tape cartridge.