JPH0524676Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention uses a pair of guide rollers and a dancer roller that is installed between the guide rollers to be able to move up and down. At the same time, a loop forming device for conveying strips forms a loop in the strip.

[Conventional technology and its problems]

A plurality of negative films are spliced, a reader is connected to one end of the spliced film, the connected negative film is led to the exposure section of the printer with the reader in advance, and the negative film is fed frame by frame by the operation of a feeding device installed in the exposure section. It has conventionally been common practice to perform continuous exposure processing.

After the exposure process, the negative film bonded body is usually cut by order or by several frames and inserted into a negative sheet bag. A so-called film envelope is used for bagging. Some of these film enveloppers automatically pack negative film into bags, and this automatic film envelopper is placed on one side of the exposure section of the printer, and the negative film is connected to the operating side of the exposure section. If it is attempted to bag bodies automatically, it becomes necessary to change the direction of conveyance of the negative film connector and to form a loop portion between the exposure section and the enveloper.

There is a device shown in FIG. 3 that changes the conveyance direction of a strip-like object such as a negative film connector.
In this changing device, a carry-in guide roller 10 and a carry-out guide roller 11 are provided so as to be inclined relative to each other, and a rotatable lower roller 12 is fixed below between both rollers 10 and 11.
is inclined at an angle α with respect to the horizontal line X.

In the above-mentioned changing device, the rollers 10, 11, 1
By guiding the strip A with the lower roller 12, the direction of transport of the strip A can be changed, and the inclination of the lower roller 12 prevents the strip A from contacting the lower roller 12 on one side, thereby making the tension distribution of the strip A uniform across the entire width of the strip A.

By the way, by providing the lower roller 12 of the changing device so as to be able to move up and down, the loop portion B can be formed in the strip A at the same time as changing the transport direction of the strip A, but in this case, the lower roller 12 Depending on the position, a part of the strip A in the width direction may come into partial contact with the lower part of the outer periphery of the lower roller 12, resulting in uneven tension across the entire width of the strip A, and there is a risk that the strip will break.

Therefore, simply by supporting the lower roller 12 so that it can move up and down, it is not possible to change the transport direction of the strip and form a loop at the same time.

[Purpose of invention]

This invention provides a loop forming device that can form a loop portion at the same time as changing the conveying direction of a strip, and can always make the tension distribution uniform in the width direction of the loop portion. It is an object.

[Structure of the idea]

In order to achieve the above object, this invention provides a carry-in guide roller and a carry-out guide roller, each of which has a horizontal axis and is relatively inclined.
A dancer roller for forming a loop is provided below between both guide rollers so as to be movable up and down and swingable in the left and right directions.

[Effect]

With the above configuration, by passing the strip around each roller, the conveying direction of the strip can be changed, and a loop portion can be formed by the dancer rollers. When the tension distribution in the width direction of the loop portion becomes uneven due to the vertical movement of the dancer roller, a biased reaction force acts in the axial direction of the dancer roller. The reaction force acts as a swing adjustment force for the dancer roller, so the dancer roller swings and changes its position to a stable position. As a result, the tension distribution in the width direction of the strip can always be made uniform.

〔Example〕

An embodiment of this invention will be described below with reference to FIGS. 1 and 2.

As shown in the figure, the carry-in guide roller 1 and the carry-out guide roller 2 are arranged with their axes horizontal, and are provided at a relative inclination. A dancer roller 3 is arranged below between both guide rollers 1 and 2, and a roller shaft 4 of the dancer roller 3 is arranged below.
The roller support member 5 that rotatably supports the roller support member 5 is supported so as to be movable up and down along the slide shaft 6 and rotatable around the shaft 6.

Now, by guiding the strip A downward along the upper outer circumference of the carry-in guide roller 1, then along the lower outer circumference of the dancer roller 3, and then pulling it out horizontally along the upper outer circumference of the carry-out guide roller 2. , it is possible to change the conveying direction of the strip-shaped material A, and to form a loop portion B in the strip-shaped material A between the carry-in guide roller 1 and the discharge guide roller 2.

In the state where the strip A is passed over as described above, when the carry-in part a of the strip A reaches the carry-in guide roller 1 is sent forward, the dancer roller 3 is lowered, and the strip that is carried out from the carry-out guide roller 2 is moved forward. The dancer roller 3 is pulled up by taking over the unloading part b of A. That dancer roller 3
The length of the loop portion B changes due to the vertical movement of the dancer roller 3, and the tension distribution in the width direction of the loop portion B becomes uneven depending on the position of the dancer roller 3.

At this time, a reaction force acts on the dancer roller 3 at a position offset in the axial direction, so the dancer roller 3 swings around the slide shaft 6 to a position where the reaction force is uniformly received throughout the axial direction. and stop.

Therefore, the tension distribution in the width direction in the loop portion B can be made uniform.

In the embodiment, the dancer roller 3 is swingably provided around the slide shaft 6, but the dancer roller 3 may be swingably attached to the roller support member 5.

〔effect〕

As described above, in this invention, the carry-in guide roller and the carry-out guide roller are relatively inclined, and a dancer roller that can be raised and lowered is provided below between both rollers. can form a section.

In addition, since the dancer rollers are provided to be able to swing in the left-right direction, if the tension distribution in the width direction in the loop section becomes uneven due to the position of the dancer rollers, the reaction force acting on the dancer rollers will be biased, causing the dancer rollers to swing. Adjustment forces come into play. Since the dancer roller swings and is displaced to a stable position by the swing adjustment force, the tension distribution in the width direction of the loop portion can always be made uniform.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of a loop forming device according to the present invention, FIG. 2 is a plan view of the same, and FIG. 3 is a front view showing a conventional belt-shaped object conveying direction changing device. 1... Carrying-in guide roller, 2... Carrying-out guide roller, 3... Dancer roller.

Claims (1)

[Scope of utility model registration request] The carry-in guide roller and the carry-out guide roller are each set so that their axes are horizontal and relatively inclined, and a dancer roller for forming a loop is placed below between both guide rollers so that it can be raised and lowered and can be swung left and right. A loop forming device for conveying belt-shaped objects installed in