JP4475532B2 - Magnetic tape cartridge - Google Patents

Description

  The present invention relates to a magnetic tape cartridge provided with a door for slidingly opening and closing a tape outlet.

  As this type of tape cartridge, for example, in Patent Document 1, a door for slidingly opening and closing a tape outlet is incorporated in a case body and is closed and urged by a door spring. The door spring is formed by continuously forming two coil portions like a spectacle frame, and a pair of spring arms are extended from each coil portion, and is arranged in a door guide groove. One spring arm is latched in a spring hanging groove (spring hanging portion) formed in the door, and the other spring arm is latched in a spring hanging groove (spring hanging portion) formed in a guide wall inside the case. These spring-hanging grooves are all formed as vertically long vertical grooves.

  A similar door structure is also found in Patent Document 2. In this case, a U-shaped notch (spring hanging portion) having an open side edge is formed at the side edge of the door, and one spring arm is received by the back end surface of the notch. Also in this case, the back end face that receives the spring arm and the spring hook groove (spring hook portion) formed in the guide wall are formed vertically.

JP 11-265560 A (paragraph number 0016, FIG. 1) Japanese Patent Laying-Open No. 2003-51172 (paragraph number 0014, FIG. 2)

  As described above, the door spring provided integrally with the two coil portions and the pair of spring arms is configured so that the pair of spring arms are inclined in an inverted C shape when the door is opened. Is subjected to a spring reaction force in the direction of rising upward. Moreover, there is room for the door spring to move up and down inside the case body. For this reason, if the door is repeatedly opened and closed, the door spring gradually rises upward, and the upper peripheral surface of the coil portion is received by the upper wall of the upper case facing the guide groove, or the entire door spring is tilted upward. It is caught on the wall.

  If the door spring slides up or the door spring as a whole is tilted as described above and the door is opened and the door spring is engulfed and deformed, the continuous base end of the spring arm is restrained by the case upper wall. May be. As a result, the tension of the door spring becomes excessive, and the door in the middle of opening may be caught and cannot be completely opened.

  The object of the present invention is to reliably prevent the door spring from sliding up when the door is opened, to clean out door catching or door opening failure due to the door spring rising, and to open and close the door properly at all times. It is an object of the present invention to provide a magnetic tape cartridge capable of performing the above. The object of the present invention is to prevent the door spring from being lifted without the need to significantly change the structure of the door or case, or the structure of the mold, and therefore, the magnetic which can satisfy the function and improve the reliability at a lower cost. It is to provide a tape cartridge.

Magnetic tape cartridge of the present invention, opening and closing the case body 1 formed by coupling the upper case 1a and a lower case 1b in the lid alignment shape, the tape outlets 4 provided on the peripheral wall of the case body 1, the tape outlets 4 In order to do so, a door 8 that is guided and supported by the case body 1 so as to be reciprocally slidable and a door spring 12 that closes and biases the door 8 are included. The door spring 12 is integrally provided with coil portions 23 and 23 and a pair of spring arms 25 and 26 that are continuously extended downward from the coil portions 23 and 23, respectively. One spring arm 25 is hooked on a spring hook portion 20 provided on the door 8, and the other spring arm 26 is hooked on a spring hook portion 30 provided on the case body 1 . The door 8 is formed with a restricting structure for restricting the upward movement of the spring arms 25 and 26 . As a restricting structure, a lateral claw receiving groove 34 for receiving a latching claw 27 provided at a protruding end of the spring arm 25 is formed in the lower portion of the spring hooking portion 20 of the door 8 .

The magnetic tape cartridge of the present invention includes a case body 1 formed by joining an upper case 1a and a lower case 1b in a lid-like manner, a tape outlet 4 provided on the peripheral wall of the case body 1, and opening and closing the tape outlet 4 For this purpose, a door 8 that is guided and supported by the case body 1 so as to be slidable in a reciprocating manner and a door spring 12 that closes and biases the door 8 are included. The door spring 12 is integrally provided with coil portions 23 and 23 and a pair of spring arms 25 and 26 that are continuously extended downward from the coil portions 23 and 23, respectively. One spring arm 25 is hooked on a spring hook portion 20 provided on the door 8, and the other spring arm 26 is hooked on a spring hook portion 30 provided on the case body 1. The door 8 is formed with a restricting structure for restricting the upward movement of the spring arms 25 and 26. As a restricting structure, a claw receiving surface 21 for receiving a locking claw 27 provided at the protruding end of the spring arm 25 is formed on the spring hanging portion 20 of the door 8, and the claw receiving surface 21 is arranged in the door opening direction. It is characterized by being inclined upward .

The magnetic tape cartridge of the present invention includes a case body 1 formed by joining an upper case 1a and a lower case 1b in a lid-like manner, a tape outlet 4 provided on the peripheral wall of the case body 1, and opening and closing the tape outlet 4 In order to do so, a door 8 that is guided and supported by the case body 1 so as to be reciprocally slidable and a door spring 12 that closes and biases the door 8 are included. The door spring 12 is integrally provided with coil portions 23 and 23 and a pair of spring arms 25 and 26 that are continuously extended downward from the coil portions 23 and 23, respectively. One spring arm 25 is hooked on a spring hook portion 20 provided on the door 8, and the other spring arm 26 is hooked on a spring hook portion 30 provided on the case body 1. The lower case 1a and the door 8 are formed with a restricting structure that restricts the spring arms 25 and 26 from sliding up. As the restricting structure, as shown in FIG. 1, claw receiving surfaces 21 and 31 for receiving the engaging claws provided at the projecting ends of the spring arms 25 and 26 on the spring hanging portions 20 and 30 of the door 8 and the lower case 1a, respectively. Form. Therefore, the both claw receiving surfaces 21 and 31 in the door closed state are inclined in a slender shape.

  In the present invention, in the magnetic tape cartridge having the door 8 that slides the tape outlet 4, one spring arm 25 of the door spring 12 is latched to the spring hooking portion 20 on the door 8 side, and the other of the door spring 12 is locked. The door 8 was closed and biased by hooking the spring arm 26 to the spring hook 30 on the case body 1 side. In addition, since at least the lower case 1b is provided with a restricting structure, the door spring 12 is prevented from sliding upward when the door 8 is opened, and the upper peripheral surfaces of the coil portions 23 and 23 are the upper wall of the upper case 1a. It can well prevent contact with the inner surface. As a result, it is possible to clean the door 8 due to the sliding up of the door spring 12, the opening failure of the door 8, and the like so that the door can be opened and closed properly and a magnetic tape cartridge with excellent reliability can be obtained.

  Claw receiving surfaces 21 and 31 for receiving the respective latching claws 27 and 28 provided at the projecting ends of the spring arms 25 and 26, respectively, are formed on the spring hanging portions 20 and 30 of the door 8 and the case body 1, respectively. If these claw receiving surfaces 21 and 31 are inclined in an upwardly slender shape, a restricting structure can be configured by performing a very simple structural change that only inclines the claw receiving surfaces 21 and 31 obliquely. The sliding up of the door spring 12 can be reliably prevented. Therefore, it is possible to obtain a highly reliable magnetic tape cartridge satisfying necessary functions at a lower cost.

  Further, as shown in FIG. 6, a magnetic tape cartridge in which claw receiving grooves 34 and 35 for receiving the hooking claws 27 and 28 are formed in the lower part of the spring hooking portions 20 and 30, as shown in FIG. According to the present invention, it is possible to reliably prevent the door spring 12 from being lifted up by simply changing the structure by adding the claw receiving grooves 34 and 35 to the lower part of the spring hooks 20 and 30, and the reliability satisfying the necessary functions at a lower cost. A highly magnetic tape cartridge can be obtained.

Embodiment 1 FIGS. 1 to 5 show Embodiment 1 of a single reel type magnetic tape cartridge according to the present invention. In FIG. 2, the magnetic tape cartridge includes a rectangular box-shaped plastic case main body 1, a single tape reel 2 accommodated in the case main body 1, and a magnetic tape 3 wound around the tape reel 2. ing. The case body 1 is formed by joining an upper case 1a and a lower case 1b that are divided into upper and lower portions in a lid-like manner.

  A tape outlet 4 is provided at one end of the front wall of the case body 1, and a shaft-shaped tape drawer 5 is located inside the tape outlet 4. The tape drawing tool 5 is mounted on the feeding end of the magnetic tape 3, and the upper and lower end shaft portions are engaged and captured by elastically deformable holding portions 6 and 6 provided on the upper and lower surfaces of the case body 1. Then, it stands by in a standing posture while facing the tape outlet 4 (see FIG. 4).

  In order to keep the tape outlet 4 closed when not in use, a door 8 that opens and closes is provided inside the front surface of the case body 1. The case body 1 has a guide groove 11 formed between the front wall 9 of the case body 1 and a guide wall 10 provided inside the front wall 9, and the door 8 is disposed in the guide groove 11 so as to reciprocate. It is slidably guided and supported. 3 and 5, the door spring 12 accommodated in the guide groove 11 is closed and urged to move freely.

  In FIG. 1, the door 8 is a plate-shaped plastic integrally formed with a main surface wall 15 that opens and closes the tape outlet 4 and a spring receiving wall 16 that protrudes from the open start end side (left side of FIG. 1) of the main surface wall 15. It is a molded product. The upper surface of the spring receiving wall 16 is provided at a position lower than the upper surface of the main surface wall 15 and has a stepped portion 17, and a guide surface 18 that is continuously inclined downward is formed at the side end of the stepped portion 17. is there.

  The spring receiving wall 16 is formed with a spring hooking portion 20 for hooking one spring arm 25 of the door spring 12. The spring hooking portion 20 is formed as a trapezoidal recess that opens at the side end of the spring receiving wall 16, and the hooking claw 27 at the protruding end of the spring arm 25 is received by the claw receiving surface 21 at the back end. The lower end of the guide surface 18 described above is continuous with the side end opening edge of the spring hook portion 20.

  In FIG. 1, the door spring 12 includes two coil portions 23, 23 adjacent to the left and right, a bridging portion 24 that connects the front ends of both coil portions 23, 23, and the rear ends of the coil portions 23, 23. Each spring arm 25 is made of a torsion coil spring made of a spring wire integrally formed with a pair of downwardly extending spring arms 25 and 26, and exhibits spring elasticity in a direction in which the pair of spring arms 25 and 26 expands. L-shaped hooking claws 27 and 28 are bent at the protruding ends of the spring arms 25 and 26, respectively.

  1, the right spring arm 25 is hooked on a spring hook 20 provided on the spring receiving wall 16 of the door 8, and the left spring arm 26 is hooked on a spring hook 30 provided on the case body 1. Thereby, the door 8 receives the spring force of the door spring 12 and is urged to move toward the closing side, and closes the tape outlet 4 when not in use. In this state, the coil portions 23 and 23 of the door spring 12 are separated from the upper wall of the upper case 1a as shown in FIG.

  The front wall 9 and the guide wall 10 of the case body 1 are made of plastic integrally with the upper case 1a and the lower case 1b, respectively, and continuously slide up and down on the joint surfaces of the upper and lower cases 1a and 1b. To do. In order to latch the other spring arm 26 (left side in FIG. 1) of the door spring 12, a groove-shaped spring hooking portion 30 is provided on the guide wall 10 on the lower case 1b side. Of the opposing groove walls of the spring hook portion 30, the groove wall indicated by reference numeral 31 functions as a claw receiving surface 31 that receives the hook claw 28 of the spring arm 26. The upper opening of the spring hook 30 is closed by the guide wall 10 on the upper case 1a side.

  In order to prevent the door spring 12 from gradually rising when the door 8 is opened and closed, a restriction structure is provided on each of the spring hooking portion 20 on the door 8 side and the spring hooking portion 30 on the guide wall 10 side. In this embodiment, in a state where the door 8 is closed, both the claw receiving surfaces 21 and 31 of the both spring hanging portions 20 and 30 are inclined in a tapered shape to form a regulating structure. Specifically, the claw receiving surface 21 on the door 8 side is inclined upwardly toward the left side in FIG. 1, and the claw receiving surface 31 on the guide wall 10 side is inclined upwardly toward the right side in FIG.

  As described above, when the claw receiving surfaces 21 and 31 are inclined upwardly, the vertical component of the spring reaction force acting between the claw receiving surfaces 21 and 31 and the latching claws 27 and 28 is obtained. Since the direction of the force can always be downward, each latching claw 27 and 28 is received and stabilized at the lower end of each claw receiving surface 21 and 31, and the latching claw is irrespective of the opening / closing position of the door 8. 27 and 28 can be prevented from sliding upward. Therefore, it is possible to reliably prevent the door spring 12 from sliding upward.

  For example, even if the latching claws 27 and 28 are displaced upward due to a drop impact, by opening and closing the door 8, the latching claws 27 and 28 are again applied to the claw receiving surface 21 by the downward component force. -Pushed back to the lower end of 31. In a state where the door spring 12 is temporarily assembled to the door 8 and the spring hanging portions 20 and 30 of the guide wall 10, the door 8 receives an upward tilting moment by the spring force of the door spring 12, but the door 8 is pressed and held. Since the door spring 12 can be prevented from sliding or laterally moving, the upper case 1a can be assembled more easily.

  When the magnetic tape cartridge is inserted into the tape drive and loaded, the right end of the door 8 hits the operation protrusion on the tape drive side and is received. By continuing to insert and operate the magnetic tape cartridge, only the case body 1 enters and moves inward of the tape drive. As a result, the door 8 can be opened against the urging force of the door spring 12. At this time, the coil portion 23 of the door spring 12 rides smoothly on the stepped portion 17 while being guided by the guide surface 18.

  While the door 8 is moving open, the spring arms 25 and 26 of the door spring 12 are elastically deformed so as to approach each other, and the coil portion 23 is moved upward by an amount corresponding to an increase in the longitudinal dimension component of both spring arms 25 and 26. Move to. However, as described above, the latching claws 27 and 28 receive a downward spring reaction force and are always held at the lower ends of the claw receiving surfaces 21 and 31. Therefore, the upper peripheral surface of the coil portion 23 does not come into contact with the upper wall of the upper case 1a after the door 8 starts to open until the door 8 is completely opened as shown in FIG. As a result, the opening failure of the door 8 due to the sliding up of the door spring 12 is cleared, and the door can always be opened and closed properly.

(Example 2) FIG. 6: shows Example 2 of this invention which changed the control structure. There, a spring hooking portion 20 made of a U-shaped recess was formed on the spring receiving wall 16. Furthermore, a longitudinal groove-shaped spring hook 30 is provided on the guide wall 10 on the lower case 1b side. In addition, claw receiving grooves 34 and 35 for receiving the respective hooking claws 27 and 28 are formed laterally below the spring hanging portions 20 and 30 of the door 8 and the guide wall 10 to form a regulating structure.

  As described above, when the latching claws 27 and 28 are latched in the laterally-claw-receiving grooves 34 and 35, even when the latching claws 27 and 28 try to move upward when the door 8 is opened and closed, the claw-receiving grooves Since the movement of the retaining claws 27 and 28 can be received and restricted by the upper groove walls 34 and 35, the upper peripheral surface of the coil portion 23 can be reliably prevented from coming into contact with the upper wall of the upper case 1a. The same as the first embodiment also in that the upper case 1a can be assembled more easily. Since other structures are the same as those of the first embodiment, the same members are denoted by the same reference numerals and description thereof is omitted. The same applies to the following embodiments.

  In addition to the above-described embodiment, instead of the claw receiving groove 34 in the second embodiment, a lateral protrusion is formed on the rear end wall of the spring hook portion 20 formed in a U-shape, and the protrusion and the spring hook portion 20 are formed. A recess corresponding to the claw receiving groove 34 may be formed between the bottom wall and the bottom wall. The claw receiving surfaces 21 and 31 can be formed by a convex arc surface or a concave arc surface, respectively. If necessary, on the inner surface of the front wall 9 facing the guide groove 11, as in the case of the restriction rib 37, a horizontally long protrusion or a horizontally long groove that receives the latching claw 27 and prevents the sliding up may be formed. Good. The door spring 12 may have a single coil portion 23.

It is a vertical front view which shows the door structure of a tape drawer outlet. It is a perspective view of a magnetic tape cartridge. It is the sectional view on the AA line in FIG. It is a vertical front view of the state which opened the door. It is the BB sectional view taken on the line in FIG. It is a vertical front view which shows the door structure which concerns on Example 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case main body 4 Tape outlet 8 Door 9 Front wall 10 of a case main body Guide wall 11 Guide groove 12 Door spring 20 Door side spring hook part 21 Door side claw receiving surface 23 Door spring coil part 25/26 Door spring coil Spring arm 27, 28 Hook claw 30 Spring hanger 31 on the case body side Claw receiving surface on the case body side

Claims (3)

A case main body formed by joining an upper case and a lower case together, a tape outlet provided on a peripheral wall of the case main body, and a reciprocating slide to the case main body to open and close the tape outlet. In a magnetic tape cartridge including a door that is guided and supported, and a door spring that closes and biases the door,
The door spring is integrally provided with a coil portion and a pair of spring arms continuously projecting downward from the coil portion,
One of the spring arms is hooked on a spring hook provided on the door, and the other spring arm is hooked on a spring hook provided on the case body,
The door is formed with a restriction structure that restricts the spring arm from sliding up ,
2. A magnetic tape cartridge according to claim 1, wherein as the restricting structure, a lateral claw receiving groove for receiving a latching claw provided at a protruding end of the spring arm is formed at a lower portion of the spring hanging portion of the door . A case main body formed by joining an upper case and a lower case together, a tape outlet provided on a peripheral wall of the case main body, and a reciprocating slide to the case main body to open and close the tape outlet. In a magnetic tape cartridge including a door that is guided and supported, and a door spring that closes and biases the door,
The door spring is integrally provided with a coil portion and a pair of spring arms continuously projecting downward from the coil portion,
One of the spring arms is hooked on a spring hook provided on the door, and the other spring arm is hooked on a spring hook provided on the case body,
The door is formed with a restriction structure that restricts the spring arm from sliding up,
As the restricting structure, a claw receiving surface for receiving a latching claw provided at a protruding end of the spring arm is formed on the spring hanging portion of the door,
A magnetic tape cartridge, wherein the claw receiving surface is inclined upward in the door opening direction . A case main body formed by joining an upper case and a lower case together, a tape outlet provided on a peripheral wall of the case main body, and a reciprocating slide to the case main body to open and close the tape outlet. In a magnetic tape cartridge including a door that is guided and supported, and a door spring that closes and biases the door,
The door spring is integrally provided with a coil portion and a pair of spring arms continuously projecting downward from the coil portion,
One of the spring arms is hooked on a spring hook provided on the door, and the other spring arm is hooked on a spring hook provided on the case body,
The lower case and the door are formed with a restricting structure that restricts the spring arm from rising,
As the restriction structure, a claw receiving surface for receiving a latching claw provided at a protruding end of the spring arm is formed on the spring hanging portion of the door and the lower case,
A magnetic tape cartridge characterized in that the both claw receiving surfaces in a closed state of the door are inclined in a constricted shape .

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