DE897653C - Device on film developing machines - Google Patents

Description

The invention relates to a signal device on film developing machines, in which the film tape is automatically pulled through the baths by a drive motor and it serves to prevent a film rite that has occurred in the machine in good time and to largely reduce the damage caused by this.

It is common practice to drag the film through the individual bath containers to lead the de-weathering machine. Here, the lower end of the loop is over guided a roller stored close to the bottom of the vessel. In many cases this role is also loosely inserted into the loop and holds the loop through her weight: stretched. If there is a film tear in such an Enfiwi.clelungsmachine before, the end of the film connected to the drive is conveyed out of the machine, while the other end stops. The threading of the film into the Vessel is extremely difficult and time consuming, especially when @ di.e loose pulleys have fallen and taken out in a cumbersome way Need to become. It is therefore extremely important that a film tear immediately afterwards Creation is recognized so that the drive is stopped and the point of interruption can be connected. The sooner the film break is recognized, the fewer are they damage incurred.

To. According to the invention there is a device that provides reversing rollers lift from the outside if the film is torn; it can do this with an on the roller axis attacking rods that slide easily in the vertical direction and extend over the The edge of the vessel leads out, or a chain attached to the upper end of the vessel be used. If the film tears, the pulley and the lifting device drop triggers a signal. and, if necessary, can also drive the development machine shut down.

The invention is shown in the drawing on one equipped with a linkage Embodiment shown schematically.

One of the bath vessels of a developing machine is denoted by i. The film tape a is guided through the bath in a loop over a roller 3. That The lower end of the loop runs over a roller 4. This roller is in a linkage 5; stored, which is arranged displaceably in the vessel through guide 6. At the flawless operations -the machine is the role 4 including: the linkage 5 through the film tape, raised and remains in this raised position during: the operation stand. Those placed at the beginning and end of the machine; Jerk rolls ensure that the film tape does not change its length and that the roller 4 does not sink can. At. an approximately occurring film crack, however, the roller 4 sinks together with the Linkage 5 immediately down, and the bent over the edge of the vessel protruding The end of the linkage touches an electrical contact 7 through which an optical or acoustic signal is triggered. The latter is not known as per se signed. In addition to the signal, the contact can also operate a relay, through that, the drive motor is de-energized: and thereby the system is shut down.

Since compressed air is usually available during development machines, Think about it with advantage. this compressed air operated acoustic signal, z. B. a whistle can be used. Fig. A shows an exemplary embodiment for this. A compressed air line has a closed end and an opening at the upper end provided- pipe S connected. About this. The end of the pipe slides in an airtight manner Sleeve io, .through which the holes 9 are closed when the operation is faultless. (A compression spring ii secures this position of the sleeve io in relation to the tube g. a film tear, on the other hand, presses the (rod 5 violate the pipe designed as a whistle Tube end 1z, whereby the sleeve moves io and the openings 9 are released so that the compressed air makes the whistle sound.

The invention can. both for: every single vessel of a developing machine come into use, but it is also possible to provide a single signal device, by suitable transmission means from all rods in the individual vessels is triggered.

In so far, several pulleys are present in one and the same vessel are "can either be a lifting device common to all, or it is a special lifting device is assigned to each role.

Claims (1)

PATENT CLAIMS: i. Device on film developing machines with automatic Promotion of this film tape, characterized by. one from the top of the developer vial Accessible lifting device for those who sit on the film near the floor Deflection pulleys, which when the load is released as a result of a film tear by spring force or actuated by the self-inflicted a signaling device. a. Apparatus according to claim i, characterized by an electrical contact device, the. at Fümriß through -The lifting device @ closed and an optical or acoustic signaling device triggers. 3. Apparatus according to claim i, characterized in that @ that the lifting device if the film is torn, it releases the closure of a compressed air line and thus an acoustic signal Signal activated. 4. Apparatus according to claim i, characterized. marked that at the same time with the signal the film drive of the developing machine is stopped.