DE1146074B - Safety device for mooring devices - Google Patents

Description

The invention relates to a safety device for feeding apparatus for sheet-fed printing machines with a stored over the sheet path, moved to its working position in time with the sequence of sheets Sensor to determine that at the time of the sensing the feed was carried out beyond the system line Arch, whereby the sensor in its clockwise movement in the working position the arch path on a in the direction of travel of the sheet cuts directly behind the contact line.

In such devices, it is known, the position of the sheet by means of two cooperating sense electrical contacts, one of which is arranged below the arc path and the others, controlled in time with the machine, above the sheet path. Because the sheet moved too far forward must electrically separate the two contacts, only sheets of electrically non-conductive material can are processed. The device is thus for metal foils or papers laminated with metal foils not usable. Electrical contacts have the further disadvantage that they increase during production soiled and this leads to incorrect switching. This occurs particularly often when freshly printed Run sheets through the machine a second time, for example with multi-color printing or in perfecting. The color particles and paper components deposited on the contact surfaces then under the influence of the pressure of the mating contact form a firmly adhering insulating layer, which has to be eliminated again and again at short intervals.

There are also arranged on the feed table feelers in the form of slide springs are known that when If an arc fails to make an electrical contact, the machine is switched off. However, these springs are constantly under pressure on the sheet to be advanced and damage them thereby the print image or the paper surface.

The invention avoids all these disadvantages in that the movement of the on its holder resiliently mounted sensor is inhibited by an arc that has been transported over the contact line and a control command due to the resulting relative movement between the sensor and its holder is triggered, which in a known manner the feeder or the printing press turns off. The feeler responds to the mechanical resistance of the arc to be sensed, see above that there are no restrictions on the material to be processed.

Safety device for investment devices

Applicant:

Roland offset machine factory

Faber & Schleicher AG,
Offenbach / M., Christian-Pless-Str. 6-30

Claimed priority:
Australia dated August 20, 1959 (no.51967)

Harold Edward Campbell,

West Preston, Victoria,

John Leonard Coffey, Carnegie, Victoria,

and John Alfred Connolly, Boy Hill Noth, Victoria

(Australia),
have been named as inventors

The device according to the invention prevents damage to the machine if a sheet is advanced too far beyond the front lays. The safety device according to the invention consists of one or more sensors and devices that, in synchronism with the feeder, raise and lower the sensor immediately in front of the front lays, as well as devices that stop the feeder and preferably at the same time the machine if the downward movement of the sensors is obstructed .
If the leading edge of a sheet touches the front lays, the feelers can move downwards unhindered, while a sheet advanced too far blocks the feelers' way down and holds them in place. For this purpose, the sensors are preferably rotatably mounted and are operated so that they are forcibly only moved upwards.

Each of the sensors for excessive sheet feed is preferably pivotable with the front lay shaft connected and designed so that it can be raised and lowered and corresponding switches in a control circuit closes if it does not complete its downward movement. The switches

309 547/41

Claims (3)

3 4 serve when actuated - to shut down the machine- 32 is supported by a tension spring 34, which on the one hand on the sensor 32 and on the other hand on a pin 35 As a further possibility or in addition, the holder 27 can be attached. On the top of the Precautions are taken that the existing holder 27 is with the interposition of an insulating Prevent sensor needle shaft from moving according to 5 fabric plate 36 a contact spring 37 is arranged, the to bring the front to completion if a sensor for a terminal 38 has. A second approach too wide Bogenvorsehub before the completion of its terminal clamp is on the plate 36 in electrical Movement down is held. This secures contact with the holder 27. Is now according to causes the existing trigger mechanism the Fig. 7 an arc 21 at the sensing time over the Shutdown of the feeder. - If you walked out the line, the touch Sometimes it happens that the trailing edge of the sensor ends 33 the sheet before the front lays of a correctly applied bow have assumed their lowest position as far upwards, and the arches that they twist the feeler for too far Bogenvorsehub feeler 32 relative to the holder 27 in the touches and raises while the feeler about this clockwise. If the bow is properly positioned Slide edge. In order to prevent the safety 15 according to FIG. 3 between the contact spring 37 and the mechanism is triggered in this FaU, the sensors 32 are a certain distance, while according to above-mentioned control switch preferably with a Fig. 7 of the sensor 32 raised and thereby with the interconnected another switch which was only brought into contact with contact spring 37. Of the is closed when the front lays are down. circuit connected to terminals 38 and 39 A preferred embodiment of the invention 20 is thereby closed and the machine still is explained with reference to the figures. _; - set. Usually two sensors 32 are provided Fig. 1 is a plan view of part of a view to also detect crooked sheets laying apparatus that can with the safety release device. The associated pairs of contacts 32, 37 are tang is provided according to the invention; connected in parallel and are also in series with Figure 2 is a perspective view of a portion 25 of another switch 40 mounted on one of the sides of the trip device; wändeil is attached and an actuating arm41 Fig. 3 is a side view in section and possessed. On the front lay shaft 12 is also a Illustrates the operation of the release device, lever 42 attached, which is only shortly before the deepest when sheets of paper are laid out correctly; Position of the front lays switch 40 according to Fig. 4 is a section taken along line 4-4 of Fig. 1 to 30 Fig. 4 closes. 5 shows the position of the lever 42 and represents a closed switch; with the front lays fully open and Fig. 6 the FIG. 5 shows the switch shown in FIG. 4 in the appropriate position of the sensor 32. According to FIG open position; the response of the sensor 32 is also used for this purpose FIG. 6 corresponds to FIG. 3 and shows the position of a become, the movement of an existing one Fingers for too wide arch preshub as well as the 35 feeler needle 19 to be locked just like the one belonging to it Parts in lifted position; the needle tip 20 falls into the recess 26 ton Fig. 7 corresponds to Fig. 3 and illustrates the dignity. For this purpose, on the pin 29 is a Operation of the safety release device when the pawl 43 is rotatably mounted, which slides on the a sheet of paper on the plant also rests forward surface of a stop plate 44, which is of the has been moved. 4 ° lever arm 14 protrudes sideways. The pawl 43 has In the side walls 11 are the front lay a paragraph 45, which is in the movement path of the shaft 12 and the sensor needle shaft 13 is rotatably abutment plate 44 and when the stores. The shaft 13 carries levers 14, 15 which, by means of sensors 32 according to FIG. 7, control the movement of the lever 14 Screws 16 are secured and the pin 17 locks. With a properly laid arch are provided on which holder 18 with the sensor 45 according to FIG. 3, however, the pawl 43 is raised, needles 19 are rotatably mounted. The front needle and lever 14 can move freely. The end 20 rests on the arch 21, which is on the position of the pawl 43 with respect to the plate 44 Contact plate 22 rests. The weight of the needle 19 is made by means of a set screw 47, which is shown in supported by the force of a leaf spring 23 which is arranged on a projection 46 of the pawl 43 an approach 24 of the lever 14 is attached and at 5 ° and is supported on the approach 31. The mechaden Projection 25 of the holder 18 presses. In a nismus is simple and relatively cheap and lets Missing bends, the slot 26 is not covered, which can be easily and quickly found on existing machines The forward movement of the needle end 20 is of the type mentioned, taking advantage of the already pre-inhibited and the feeder or the printing machine existing shutdown and triggering devices are stopped. This needle sensing is known. 55 bring. The safety device according to the invention ent- PATPNTANSPRürnp.
holds split holders27, which by means of the screws28 patent claims,
are clamped on the front lay shaft 12 and 1. Safety device for feeders carry a pin 29 on which the hub 30 of the sheet-fed printing presses is rotatably mounted with a sensor 32 above the sensor 32, the hub 30 being supported by 60 sheet tracks, in time with the sheet sequence with a rear one Approach 31 is provided. The sensor moved into its working position to the weight of the sensor 32 causes its rotation to be detected at the sensing time via the counterclockwise direction, so that according to FIG Front lays adjacent arc of the sensor 32 to 65 in the working position the sheet path rests on a in the front lay shaft 12 and the front sheet running direction immediately behind the contact sensor end 33 intersects below the surface of the line lying point, thereby marked contact plate 22 extends. The weight of the probe is characterized in that the movement of the holding on its tion (27) resiliently mounted sensor (32) by a forward transported over the plant line Arch inhibited and a control command due to the resulting relative movement between the sensor (32) and its holder (27) is triggered, which in a known manner the feeder or the printing press turns off. 2. Apparatus according to claim 1, characterized in that the relative movement ίο between the sensor (32) and the holder (27) an electrical contact (37) is actuated and thereby a Circuit for generating the control command is closed. 3. Apparatus according to claim 1, characterized in that by the relative movement between the sensor (32) and the holder (27) the movement of a sensor needle known per se (19) blocked for missing sheets and a control command is triggered as a result. Considered publications:
German Patent No. 496,374;
French patent specification No. 1120 419. For this purpose 2 sheets of drawings © 309 547/41 3.63