JPH042472Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disk cartridge that stores therein a disk for recording information or reproducing recorded information.

Recording of information to or reproduction of information from a disk housed inside the disk cartridge is performed by inserting a recording or reproduction head through an insertion window provided in the disk cartridge. Such a conventional disk cartridge is shown in FIGS. 1 and 2.

FIG. 1 is a plan view of the lower case with the upper case of a conventional disk cartridge removed, showing the internal structure of the lower case, and FIG. 2 is a surface view of the upper case that covers the lower case of FIG.

In FIGS. 1 and 2, the case body made of synthetic resin is composed of an upper case 1 and a lower case 2, which are divided into two parts. These upper and lower cases 1 and 2 are joined together by ultrasonic welding means with their peripheral walls 3 and 4 abutted against each other. The upper and lower cases 1 and 2 have drive shafts for recording and reproducing devices (not shown).
Through holes 5, 5 are formed that do not prevent the intrusion of.
Reference numeral 6 denotes a sheet-shaped disk setting area located concentrically with the through hole 5 and housed in the lower case 2, and 7 a partition wall formed on the inner wall surface of the lower case 2 and almost surrounding the disk setting area 6. It is formed into an almost annular shape and serves as a reinforcement area for the upper and lower cases 1 and 2 and a setting area 6.
It also serves the dual purpose of preventing dust from entering the interior. 8,
Reference numeral 8 denotes a magnetic head insertion window located at the front side of the upper and lower cases 1 and 2 and formed in the disk setting area 6. Reference numeral 9 denotes a shutter member that opens and closes the magnetic head insertion windows 8, 8 in the upper and lower cases 1, 2. The shutter member 9 is usually formed of a metal plate, and is in the closed position shown by the solid line in FIG. It can be moved from the position to the open position shown by the broken line. 10
A dial display member is rotatably housed in the lower case 2, and has teeth 11 on the outer periphery and a display hole 12 in the center. This lower case 2
The scale 13 of the upper case 1 is on the dial display member 10 of
The amount of recording and reproduction can be displayed by overlapping the display holes 12 and indicating the scale 13.

On the other hand, in FIGS. 1, 3, and 4,
14 is a ratchet mechanism that allows the dial display member 10 to rotate in only one direction, and both ends of the ratchet member 15 of this ratchet mechanism 14 are connected to the lower case 2.
A ratchet pawl 17 that engages with the teeth 11 of the dial display member 10 is provided approximately in the center, and when the ratchet pawl 17 engages with the teeth 11, the dial display member 1
The direction of rotation of 0 is regulated.

Reference numeral 18 denotes a lock mechanism for preventing rotation of the dial display member 10, and this lock mechanism 18 is composed of a lock member 19, a lock lever 20, and a compression spring 21.

The lock member 19 has a lock release hole 22,
A moving hole 23, a long hole 24, and a compression spring receiver 25 are provided, and the lower case 2 is provided with a spring receiver 26, a stopper seat 27, and pins 28, 29.

Therefore, as shown in FIGS. 1, 3, and 4, the lock mechanism 18 is sandwiched between the peripheral wall 4 and the partition wall 7 of the lower case 2 from the outside on its left and right sides, and the moving hole 23, the stopper seat 27, The engagement between the elongated hole 24 and the pin 28 and the pin 29 restrict movement in the left and right directions, so that linear movement is possible only in the upward and downward directions in the figure.

The manner in which the dial display member 10 is locked or unlocked by the locking mechanism 18 will be described below with reference to FIGS. 3 and 4.

3 and 4 are enlarged views of the dial display member 10 and lock mechanism 18 of FIG. 1, with FIG. 3 showing the locked state and FIG. 4 showing the unlocked state.

First, in FIG. 3, when the compression spring 21 is expanded and the lock member 19 is moved to the pin 29 as shown in FIG. From the right to the left in FIG. 3, the ratchet pawl 1 of the ratchet mechanism 14
7 and the teeth 11 of the dial display member 10 are engaged, and the dial display member 10 is in a locked state.

The transition from the locked state shown in FIG. 3 to the unlocked state shown in FIG.
Inserting a zero clears the lock condition.

In other words, as shown in Fig. 4, the lock release hole 2
2. Lock release pin 3 along with stopper seat 27
0, the compression spring 21 is compressed, whereby the locking member 19 is guided by the elongated hole 24 and the pins 28, 29 and pushed up from the bottom to the top in FIG.

As the lock member 19 moves from the bottom to the top, the lock lever 20 also moves, and as a result of the movement of the lock lever 20, the pressing force of the ratchet mechanism 14, which had been pressed until now, is released and the lock lever 20 is moved to the fourth position. As shown in the figure, the ratchet member 15 is restored using the pins 16, 16 as fulcrums.

That is, by restoring the ratchet member 15 of the ratchet mechanism 14 using the pins 16, 16 as fulcrums, the engagement between the ratchet pawl 17 and the teeth 11 of the dial display member 10 is released, and the lock of the dial display member 10 is released. It is.

As described above, the dial display member 10 is unlocked by inserting the lock release pin 30 into the lock release hole 22 as shown in FIG. By taking out (pulling out) the lock release pin 30, the dial display member 10 is placed in the locked state.

However, the locking force of the conventional locking lever 20 is as shown in FIGS. 1, 3, and 4.
The compression spring 21 is installed by inserting one end into the compression spring receiver 25 of the locking member 19, and inserting the other end into the spring receiver 25.
It was assembled by compressing it into 6.

However, the compression spring 21 itself is a small component, and when the compression spring 21 is compressed during assembly, it springs up due to the repulsive force of the compression spring 21, which takes time and effort to assemble, resulting in poor workability. There were flaws.

Furthermore, a disk cartridge as described in Japanese Patent Application Laid-Open No. 58-57685 has been proposed.

This publication includes a dial display member that is rotatably attached in a case and has many teeth on the outer periphery, and an elastic material that has claws that engage with the teeth of the dial display member. A first disc cartridge is disclosed that has a stopper member that rotates within a predetermined range, and a lock lever that rotates in conjunction with opening and closing of the shutter and whose other end engages with the stopper member.

The same publication also describes a dial display member that is rotatably attached within the case and has a large number of teeth on the outer periphery, a claw that engages with the teeth of the dial display member at the tip, and a protrusion on the cartridge case at the other end. A second disk cartridge is described having a slidable locking member extending into the insertion hole.

Furthermore, the same publication describes a dial display member that is rotatably attached within a case and has a large number of teeth on its outer periphery, and a slideable lock member that has a claw at its tip that engages with the teeth of the dial display member. A third disk cartridge is described having a connecting plate connecting the locking member and the shutter.

However, in the case of the first disc cartridge, the stopper member and the lock lever are engaged with each other by abutting their end faces against each other, and when releasing the engagement, the lock lever is moved along the end face of the stopper member. By doing so, the lock lever can be removed from the stopper member.

However, with this structure, the engagement area between the stopper member and the lock lever is not sufficient, and the engagement may be disengaged due to vibration or the like, and the dial display member may rotate freely.

Furthermore, if the attachment positions of the stopper member and the lock lever are misaligned relative to each other, the lock lever may not engage smoothly when the lock lever is removed from the stopper member and then re-engaged. Furthermore, in a structure in which the stopper member's own elasticity is used to remove its pawl from the teeth of the dial display member, repeated use over a long period of time causes the stopper member to gradually fatigue and its elastic force decreases, causing the dial display to There are disadvantages such as uncertainty about parts coming off the teeth.
There is a problem with operational reliability.

Furthermore, in the second and third disk cartridges, since the sliding direction of the lock member is substantially the same as the rotating direction of the dial display member, the dial display member may move unexpectedly due to the slide of the lock member. This causes the dial display to be out of order, causing problems in operational reliability.

The purpose of the present invention is to eliminate such conventional drawbacks and provide a disk cartridge that has a small number of parts, saves time and effort for assembly, has good workability, and has high operational reliability. It is.

In order to achieve the above-mentioned object, the present invention includes a dial display member that is rotatably installed in a case and has a large number of teeth on the outer periphery, and a dial display member whose base end is rotatably supported and a free wheel extending from the base end. A ratchet member having an inclined portion on the end side and a ratchet pawl near the tip of the inclined portion that engages with the teeth of the dial display member, a stopper member for regulating the rotation range of the ratchet member, and a lock release pin. a locking member that is retracted with respect to the ratchet member upon insertion, and whose tip end abuts the inclined portion of the ratchet member at least when the dial display member is locked; and the tip end of the lock member abuts the inclined portion of the ratchet member. and a leaf spring that always elastically biases the dial display member in the direction, and when the dial display member is locked, the tip of the locking member presses the inclined portion of the latching member due to the elastic biasing force of the leaf spring.
The ratchet claw of the ratchet member is engaged with the teeth of the dial display member to prevent rotation of the dial display member, and when the dial display member is unlocked, the lock member is pushed against the elasticity of the leaf spring by inserting the lock release pin. This feature is characterized in that the ratchet member is made rotatable by being moved back, and the pressing force of the ratchet pawl against the teeth of the dial display member is released, thereby making the dial display member rotatable.

Embodiments of the present invention will be described below with reference to the drawings.
5 to 8 relate to embodiments of the present invention, and FIGS. 5 and 7 show the dial display member 10.
6 and 8 show the unlocked state in which the dial display member 10 is unlocked.

5 to 8, 31 is a leaf spring that elastically urges the lock lever 20 in the locking direction, 32 is a rotation permitting hole made of an elongated hole or a large diameter hole as shown in the figure, 33 and 34 are stoppers, and 35 is a support pin.

As shown in these figures, the ratchet member 15 is rotatably supported around a pin 16a, and its free end side is bent into a substantially dogleg shape to form an inclined portion. A ratchet pawl 17 is provided at the tip of the inclined portion. The lock lever 20 comes into contact with this inclined portion.

The range of rotation of the ratchet member 15 is determined by either or both of the engagement of the rotation permitting hole 32 and the pin 16 and the stopper 33, which function as a stopper member for the ratchet member 15.

In such a structure, first of all, Figs. 5 and 6
The manner in which the dial display member 10 is locked or unlocked will be explained with reference to the drawings.

As shown in FIG. 5, when the dial display member 10 is in the locked state, the elasticity of the leaf spring 31 locks the lock member 19 of the lock mechanism 18 and the lock lever
0 is pushed downward, and the ratchet pawl 17 of the ratchet member 15 of the ratchet mechanism 14 engages with the teeth 11 of the dial display member 10 as shown in FIG. 5, thereby locking the dial display member 10.

In order to release this locked state, as shown in FIG. 6, the lock release pin 30 can be inserted along the lock release hole 22 and the stopper seat 27 as in the conventional case.

In other words, the lock release pin 30 is inserted into the lock release hole 2.
2, the force of the plate spring 31 pushing down the lock member 19 and lock lever 20 is greater than the force exerted by the lock release pin 30 on the lock member 1.
9. The force trying to push up the lock lever 20 becomes larger, and this causes the leaf spring 31 to move to the sixth position.
It can be bent upward as shown.

When the lock member 19 and the lock lever 20 are pushed upward by the lock release pin 30 in this way, the ratchet pawl 17 of the ratchet member 15 releases the engagement with the teeth 11 of the dial display member 10, and thereby The locked state of the dial display member 10 is released as shown in FIG.

Moreover, the transition from the unlocked state shown in FIG. 6 to the locked state shown in FIG. 5 can be achieved by pulling out the lock release pin 30 shown in FIG. Lock member 19, lock lever 2
0 is pushed down, and as a result, the ratchet member 15 rotates about the pin 16a, and the ratchet pawl 17 and the teeth 11 of the dial display member 10 mesh with each other, resulting in a locked state.

Since the plate spring 31 is provided to elastically bias the lock lever 20 of the present invention in the locking direction, the structure is simplified and the insertion force of the lock release pin 30 of the camera body can be reduced.

Further, the leaf spring 31 can be easily installed and replaced even in a narrow space, and the size can be reduced accordingly.

7 and 8 show other embodiments shown in FIGS. 5 and 6, and the leaf spring 3
The only difference is the shape of 1.

7 shows the dial display member 10 in a locked state, and FIG. 8 shows the dial display member 10 in an unlocked state.

The same effects as those shown in FIGS. 5 and 6 can be obtained in the cases shown in FIGS. 7 and 8 as well.

In the present invention, a leaf spring is provided to elastically bias the lock lever of the locking mechanism in the locking direction, so the number of parts is reduced, the structure is simplified, and the effort of mounting, replacing, and assembling can be saved.

Furthermore, since the structure is such that the distal end of the lock member abuts against the inclined portion of the ratchet member, the engagement and disengagement operations between the ratchet member and the lock member are smooth.

Further, by providing the ratchet member with an inclined portion, a degree of freedom is provided in the arrangement of the lock member. Also,
Even if there is some misalignment between the two, the locking member will reliably come into contact with any part of the slope, and the engagement range will be sufficient, so vibrations etc. will cause the latch member and locking member to There is no possibility of disengagement.

For this reason, it is possible to provide a disk cartridge with high operational reliability.

[Brief explanation of the drawing]

Figure 1 is a plan view showing the internal structure of the lower case of the disk cartridge, Figure 2 is a surface view of the upper case, Figures 3 and 4 are detailed views showing the conventional lock mechanism, and Figure 3 is a plan view showing the internal structure of the lower case of the disk cartridge. Diagram showing the lock state, No. 4
The figure shows the state in which the lock state is released.
8 to 8 are detailed views showing the locking mechanism according to the present invention, FIGS. 5 and 7 show the locked state, and FIGS. 6 and 8 show the unlocked state. It is. DESCRIPTION OF SYMBOLS 1... Upper case, 2... Lower case, 10... Dial display member, 14... Ratchet mechanism, 18
...Lock mechanism, 19...Lock part plate, 20...
Lock lever, 31...plate spring.

Claims (1)

[Claims for Utility Model Registration] A dial display member that is rotatably attached within a case and has a large number of teeth on its outer periphery, and a dial display member whose base end is rotatably supported and is inclined toward a free end extending from the base end. a ratchet member having a ratchet claw near the tip of the inclined part that engages with the teeth of the dial display member; a stopper member that restricts the rotation range of the ratchet member; a locking member which is retracted with respect to the dial display member and whose tip abuts the inclined portion of the ratchet member at least when the dial display member is locked; and a leaf spring that biases the dial display member, and when the dial display member is locked, the tip of the locking member presses the inclined portion of the ratchet member due to the elastic biasing force of the leaf spring.
The ratchet claw of the ratchet member is engaged with the teeth of the dial display member to prevent rotation of the dial display member, and when the dial display member is unlocked, the lock member is pushed against the elasticity of the leaf spring by inserting the lock release pin. 1. A disk cartridge characterized in that the dial display member is made rotatable by moving the dial display member back and making the ratchet member rotatable, and releasing the pressing force of the ratchet pawl against the teeth of the dial display member.