JPH0214679A - Film positioning device for disk film player - Google Patents

Abstract

PURPOSE:To attain accurate positioning by providing a claw engaging with a notch of a peripheral part of a disk film and an engagement member engaging with a hub via a spring for torque charge. CONSTITUTION:The positioning of a film 13 is attained by not only the engagement among a hub hole 12a, an engagement member 18, a key slot 12b and a key slot engagement part 18b but also the engagement between a notch 13b and a claw 20b provided to the peripheral part. Thus, a play of the hub 12 is not amplified toward the peripheral part and a charge spring 19 is used then a required torque or over is not exerted to the film 13, then accurate frame feed is applied. Thus, accurate positioning is attained.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides a method for reading the image of a predetermined frame recorded on a disc film provided in a case and outputting the disc film as an image signal. The present invention relates to a positioning mechanism for a disc film player that positions a disc film player at a predetermined position.

(Contradiction of the Invention) Next, a conventional example will be explained using the drawings. FIG. 4 is a block diagram illustrating a method of positioning the film of a conventional disk film monitor.

In the figure, 1 is a disc film. This disk film 1 has a hub 2 installed in the center and a hub 2.
It consists of a disc-shaped film 3 attached to the circumferential surface of. In the center of the hub 2, there are provided a hub hole 2a, an abbreviated keyway 2b connected to the hub hole 2a, and a "1 oversize 2C" with a substantially rectangular mouth shape. A plurality of grooves 2d are engraved in the hole 2a.Further, the film 3 has a plurality of frames 3a (15 frames in this embodiment) on which images are recorded along the circumference of the hub 2. Notches 3 carved at equal pitches corresponding to multiple pieces 3a
b is formed.

Reference numeral 4 designates a drive shaft for the disk fill 11, and an engaging portion 4a that engages with the hub hole 2a is provided at the tip end of the drive shaft 4. The engaging portion 4a is provided with a protrusion 4b that engages with a keyway 2b provided in the hub hole 2a.

In such a configuration, a hub hole 2 is formed in the disc film 1.
The engaging portion 4a of the drive shaft 4 engages with the key groove 2b.
When projection /Ib engages with J:, the disc film is positioned.

(Problems to be Solved by the Invention) In the conventional example with the above configuration, under normal machining accuracy, the keyway 2b and the protrusion 4b, and the hub hole 2a and the engaging portion 4a
The backlash is unavoidable. This play is, for example, zero play in the radial direction between the keyway 2b and the protrusion 4b.
．． If it is 1 mm, it will expand to 0.6Il1m at the outer periphery of the disc film 1. Since the frame dimensions of the disc film 1 are 8.25 x 10.6 mm, the error is 0.6/8.25, or about 7%.

The present invention has been made in view of the above problems, and its object is to provide a film positioning mechanism for a disc film player that allows accurate positioning.

(Means for Solving the Problems) The present invention solves the above problems by reading the image of a predetermined frame recorded on a disc film provided in a case and outputting it as an image signal by reading the disc film. A positioning mechanism for a disc film player that positions the disc film at a predetermined position, wherein a flexible pawl that engages with a notch on the outer periphery of the disc film is provided in the case, and a torque charging spring is provided. An engaging member that engages with the hub of the disc film is provided on the drive shaft of the disc film.

(Function) In the film positioning mechanism of the disc film player of the present invention, the disc film is positioned by a claw that engages with a notch on the outer periphery and an engagement member that engages with the hub.

(Example) Next, one embodiment of the present invention will be described using the drawings.

FIG. 1 shows a practical example of the present invention, J-a perspective view of the main parts;
2 is a plan view of the disc film and case in FIG. 1, and FIG. 3 is a plan view taken along the line Δ-8 in FIG. 2.

First, in FIG. 1, reference numeral 11 denotes a disk film rotatably provided in the case 100.

This γ isk film 11 is attached to the hub 1 provided in the center.
2 and a disc-shaped film 13 attached to the circumferential surface of the hub 12. In the center of the hub 12, there are provided a hub hole 12a and a different through hole 120 having a substantially rectangular opening, such as an abbreviated 4'' groove 12b overlapping the hub hole 12a.

Further, a plurality of marks 12d are carved in the hub hole 12a. Further, along the circumference of the hub 12, on the outer periphery of the film 13, there are images (9?0 frames 13a (in this embodiment, 15 frames)) and a plurality of frames 13a. Notches 13b are formed with equal pitches.

14 is a drive Tanabata, and the output shaft 14 of this drive Tanabata 14 is
A pinion gear 15 is attached to a. The pinion gear 15 meshes with the highest gear 16a of the gear train 16. Further, a drive shaft 17 is provided protruding from the final stage gear 16b of the gear train 16. A screw hole 17a is provided at the tip of the drive shaft 17.

Reference numeral 18 denotes an engaging member that fits into the hub hole 12 of the disc film 11.
a, a truncated conical hub hole engaging portion 18a that can be engaged with a truncated conical hub hole engaging portion 18a, and a T-groove engaging portion 18b that is connected to the hub hole engaging portion 18a and that can be engaged with a key rR12b of the disc film 11. ing. Further, a through hole 18r is provided in the hub hole engaging portion 18a.

Two projections 18c and 18d projecting toward the gear train 16 are provided on the lower surface of the engagement member 18.

A groove 18e is provided in one of the protrusions (protrusion 18C in this embodiment).

Two protrusions 16c and 16d are provided around the drive shaft 17 on the last stage gill 6a of the tooth row 16, and protrude toward the engaging member 18. Then, one of the protrusions (in this example, the protrusion 16C) is filled with
60 are provided.

Reference numeral 19 denotes a charge spring that is loosely fitted to the drive shaft 17, and has a hook 19a that is hooked to the groove 18a at one end, and a hook 19b that is hooked to the groove 16e at the square end. Note that 22 is inserted through the through hole 18f of the engaging member 18 and screwed into the screw hole 17a of the protrusion 16d, so that the engaging member 1
8 is rotatably attached to the drive shaft 17.

Next, the case 100 in which the disc film 11 is rotatably provided will be explained using FIGS. 2 and 3. The case 100 consists of a case body 20 and a lid 21, each of which has holes 20a and 21a into which the hub 12 is fitted. A flexible claw 20 is provided on the side wall of the case body 20 and engages with a notch 13b carved in the outer periphery of the film 13.
b is provided. Further, a guide 20C that comes into contact with the front surface (or back surface) of the film 13 is connected to the claw 20b.

Next, the operation of the above configuration will be explained. disc film 1
1 is set in a disc film player, the engaging member 18 is inserted into the hub hole 12a and the protrusion 1 is inserted into the hub hole 12a.
8c is key FM12bk:, the claws 20b engage with the notches 13b, respectively.

When performing frame-by-frame forwarding, the drive motor 14 rotates. This rotational force is transmitted via the gear train 16 to the final stage gear 16b provided with the drive shaft 17. R final gear 1
6b rotates in the direction of the arrow in FIG. 1, the hook 19a of the charge spring 19 remains fixed,
Only the hook 19b is pressed in the direction of the arrow. This striking force is applied to the charge spring 1 until it reaches a level at which the engagement between the notch 13b and the pawl 20b is actually released.
is accumulated as torque. Then, when torque is accumulated in the charge spring 19 to the level of the pressing force at which the engagement between the notch 13b and the pawl 20b is actually released, or the projection 18a of the engagement member 18 is connected to the projection of the final gear 16b. When 16C contacts and rotates together, the claw 20b retreats toward the side wall of the case body 20, and the notch 13b and the claw 2
The engagement with 0b is released. At this time, the drive motor 14
stops. The disk film 11 is rotated by the accumulated torque of the spring 19, and the next frame is moved to a predetermined position. The accumulated torque is used up, and the flexible pawl 20b engages with the notch 13b provided corresponding to the next frame, completing the frame advance.

According to the above configuration, the positioning of the disc film 13 is performed not only by the engagement between the hub hole 12b and the engagement member 18, and between the keyway 12b and the keyway engagement part 18b, but also by the engagement between the hub hole 12b and the engagement member 18b and the keyway engagement part 18b. This is also achieved by engagement with the claw 20b. J: So, the play in the hub 12 is not amplified as it goes towards the outer periphery, unlike in the conventional case.
Accurate positioning becomes possible. In addition, by using one f-yage spring, the disc film 131
Since no more torque than necessary is applied to ν, accurate frame-by-frame feeding is possible. Furthermore, by providing the guide 20C, when the claw 20b retracts toward the side wall of the case body 20 and engages with the notch 13b corresponding to the next frame, the claw 20b can be reliably
0b can be guided in the notch direction.

Note that the present invention is not limited to the above embodiments.

For example, in the embodiments described above, frame-by-frame feeding is driven by a motor, but the present invention can also be applied to a disc film player in which frame-by-frame feeding is performed manually.

(Effects of the Invention) As explained above, according to the present invention, a flexible claw that engages with the notch in the outer circumference of the disc film is provided in the case, and the disc film is By providing an engaging member on the drive shaft of the disc film that fits in one system with the hub of the disc film player, accurate positioning is possible.
'B-determining structure can be realized.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the main base showing one embodiment of the present invention, and FIG.
The figure is a plan view of the disc film and case in Figure 1, and Figure 3 is the AAI? FIG. 4 is a block diagram illustrating a film positioning mechanism of a conventional disc film monitor. In these figures, 1.11... Disc film 2.12... Hub 3.13... Film 3
a, 13b... Notch 4, 17... Drive shaft 14.
... Drive motor 16 ... Gear train 18 ... Engagement member 19 ... Di1 Siege spring 20 ... Case body 20b ... Claw patent application population
2. stock association ceremony manager
Patent attorney Fuji Ijima 1 person

Claims (1)

[Scope of Claim] A positioning mechanism for a disc film player that positions the disc film at a predetermined position when reading an image of a predetermined frame recorded on a disc film provided in a case and outputting it as an image signal. A flexible pawl that engages with a notch in the outer periphery of the disc film is provided in the case, and an engaging member that engages with the hub of the disc film via a torque charging spring is provided in the case. A film positioning mechanism for a disc film player, characterized in that it is provided on a disc film drive shaft.