JPS5924065Y2 - display device - Google Patents

Description

[Detailed description of the invention] The present invention is designed to provide a large number of images consisting of figures, characters, etc. on a film, such as in a central warning system or a route guide system for vehicles, and to print them at high speed using the output of a sensor, etc. In the display device that selects and displays the corresponding figure, with a simple structure, appropriate tension is applied to the film not only when the film is being driven, but also when it is stopped (when not being driven), so that an image without sagging is displayed. The object of the present invention is to provide a display device.

Conventionally, various display devices have been proposed in which a desired image is displayed by winding a film with an end around one spool and rotating the other spool.

In this type of device, a method is adopted in which frictional force is applied to the supply spool in order to apply tension to the film in order to eliminate slack in the film, but with this method, the tension is unstable, and when the film is not driven, It has the disadvantage of not being able to apply tension.

There is also a method in which separate motors are provided for both the supply and take-up spools, and the motors are driven to create tension on the film, but since two motors are used, both motors can be controlled. The drawback is that it is complicated and expensive.

The present invention was made to eliminate these drawbacks, and it absorbs the slack and excessive tension of the film caused by changes in the effective diameter of both the supply and take-up spools, and also provides a stable film. To provide a display device that can constantly apply tension and obtain images without sag.

One embodiment of the present invention will be explained in detail below. 1 is an edged film, and the surface of the film 1 has a warning image or a guide image (not shown) consisting of characters, figures, etc. every frame. ) etc. are printed.

Reference numerals 2 and 3 denote spools for winding the film, to which ends of the film 1 are fixed.

Further, the two spools 2 and 3 are arranged around a drive gear 6, which will be described later, so that the angle at which the two spools are viewed from the center of the drive gear does not exceed 180 degrees. In order to be able to move in the circumferential direction of the gear, the respective spool shafts 2a and 3a are provided on the outer periphery of the drive gear and are supported in arcuate bearings in the grooves 4 and 5.

Reference numeral 6 denotes a drive gear, which is rotationally driven by a forward/reverse motor 7 driven by the output of a sensor (not shown).

Gears 8 and 9 have the same pitch and are fixed to the spool shafts 2a and 3a, and are rotationally connected to the drive gear 6 to drive the two spools 2 and 3.

10 is a pulley for regulating the speed of the film 1, and has a claw 10a that engages with a perforation (not shown) continuously provided on the edge of the film 1. , and is rotationally connected to the drive gear 6 to feed out the film 1 at a constant speed.

11 is a spring, which connects the two spools 2 and 3;
A hook is passed around the spool shafts 2a and 3a, and the two spools are always biased so that they attract each other.

An idle roller 12 guides the film 1 to a display position such as a display window.

To explain the operation of the display device configured in this way, if the motor 7 is activated by the output of the sensor and the drive gear 6 is driven in the direction of arrow A, the spools 2, 3 and pulley 10 are moved in the direction of arrow B, respectively. C and D
As the film 1 rotates in the direction, the film 1 is sent out from the spool 3 on the supply side and wound onto the spool 2 on the take-up side.

As the film 1 continues to be wound, the effective diameter of the take-up spool 2 (the diameter of the spool plus the thickness of the wound film) increases, and the effective diameter of the supply spool 3 decreases. Therefore, assuming that in the initial state, the film winding speed of the take-up side spool 2 and the film feeding speed of the supply side spool 3 are equal to the speed of the film 1, which is regulated to be constant by the pulley 10, then The winding speed of the take-up side spool 2 and the feeding speed of the supply side spool 3 change in accordance with the change in the effective diameter, and a difference occurs between the film speed and the constant film speed, and the film may become slack.
Otherwise, excessive tension will be applied to the film, but the spools 2 and 3 are biased by the spring 11 in the former case, and biased by the tension from the film in the latter case, and the spools 2 and 3 are biased by the tension from the film in the former case, and Since the film moves on the drive gear 6 in a direction that provides a suitable rotational speed, slack and excessive tension can be absorbed, and an appropriate tension is applied to the film by the spring 11.

As described above, the present invention is a screen display device that drives an edged film 1 having a large number of images and selects and displays a desired image. two spools 2 and 3, each of which has two spools fixed at both ends thereof, and is disposed around the drive gear 6 so as to be movable in the circumferential direction of the drive gear;
gears 8 and 9 fixed to each of the two spools and meshing with the drive gear 6 to drive the two spools; A pulley member having mating claws 10a, a spring 11 that connects the two spools 2 and 3 so as to attract each other, and an idle roller 12 that guides the film 1 to the display position are provided. The screen display device is characterized by the following effects according to the present invention.

■ The structure is simple because two spools with fixed ends of the film are driven by one motor.

- The spool moves on the drive gear to absorb film slack and excessive tension caused by changes in the effective diameter of the spool, which is advantageous in terms of space.

■ Since the spring that applies tension to the film is strung between spools that can move on the drive gear, the tension on the film feeding side and the winding side can be equalized, and the film can be driven smoothly.

■ The film can be fed out at a constant speed using a pulley.

[Brief explanation of drawings]

The drawings are explanatory diagrams showing one embodiment of the present invention. 1... Film, 2, 3... Spool, 2a. 3a... Spool shaft, 4, 5... Bearing groove, 6... Drive gear, 7... Forward/reverse motor, 8, 9... ... Gear, 10 ... Pulley, 10 a ... Pawl, 11 ... Spring, 12 ... Idle roller.

Claims (1)

[Scope of utility model registration request] In a display device that drives an edged film 1 having a large number of images to select and display a desired image,
A drive gear 6 driven by a forward/reverse motor 7, and two ends of the film 1 fixed at both ends thereof and movably arranged around the drive gear 6 in the circumferential direction of the drive gear. spools 2 and 3; gears 8 and 9 fixed to each of the two spools and meshing with the drive gear 6 to drive the two spools; A pulley 10 having a claw 10a that engages with the perforation of the film 1, and the two spools 2.
, 3, and an idle roller 12 that guides the film 1 to the display position.
A screen display device characterized by comprising: