JP4850434B2 - Safety device for sheet feeding device - Google Patents

Description

  The present invention relates to a superordinate device of claim 1.

  In the case of a sheet processed by a sheet processing machine, for example, after the printing process and the refining process have been completed, the sheet is transferred from the transfer system, which is a component of the sheet feeding device, to the stack chamber that extends below the transfer system. It is transported and placed on a sheet stack. This transport system is most often formed as a chain conveyor. The stack support plate is activated to receive the sheet stack into the stack chamber, so that the stack drop height is about the same for each sheet after being released from the gripping system. It gradually sinks while production continues.

  With remote stack support plates or sheet stacks, the stack chamber is in most cases freely accessible to the operator. This creates a risk of injury to the operator due to a collision with a rapidly moving gripping system.

  During the stacking process, the operator in the sheet feeder must also attempt a handling operation that requires a hand to be pushed into the stacking chamber, which likewise leads to injury. Is.

  German Patent Application No. 103 10 236 B3 discloses a safety facility in a feeding device for a sheet processing machine. The safety equipment includes input equipment and sensors incorporated in the access area, and these sensors are operatively associated with the drive device to stop the drive device upon detection of an entry in response to an operator intrusion. And can be heard by the operator at the input device, and thus individual access areas can be designated for carrying out immediate handling operations, and the operational relationship between the safety equipment and the drive Is switched to open by a predetermined input for entering the access area at a predetermined time interval, and the access area is determined by each input.

  As a result, the stack chamber is shielded from operator intrusion not related to the handling operation, even in an area where the operator can freely reach for the handling operation. A protective device formed as a stationary protective device, or a mobile protective device in the form of a movable space partition, mechanically shields the stack chamber to limit this accessibility, but such a protective device Can be omitted significantly. However, this does not exclude the combination of this kind of protective equipment and the safety equipment according to the invention. An unimpeded implementation of the handling operation is ensured, and the operator can determine the entry range that must be entered when the operator performs an upcoming handling operation. After determining the entry range by performing the corresponding input, the operator can attempt a handling operation in the determined entry range within a predetermined time interval, even during ongoing production. On the other hand, if the operator enters a part of the undetermined range, this is usually identified by the operator as dangerous handling and the drive of the transport system stops.

  This safety equipment is prone to failure for certain handling operations.

  From European Patent Application No. 1 059 257 A2, it is known in a feeding device of a sheet processing machine to incorporate sensors beside a sheet stack in a sheet transporter at a predetermined interval. The sensor recognizes whether or not the sheet stack faces the sensor at that level, and thereby expands the vertical spread of the free space below the sheet transporter that occurs as the sheet stack descends Is detected over a predetermined value. The signal given by the sensor when this spread exceeds a predetermined value, in the sense of stopping the drive which is operatively associated with the sheet transporter, or withdrawing the space partition, under the control of the drive Processed with meaning.

  By this measure, the area at risk is limited to the intermediate space required for stack formation between the sheet transporter system and the stack upper edge. However, this area can be accessed by the operator even during production.

From German Offenlegungsschrift 197 01 645 A1, a device for handling and manipulating a sheet stack formed by sheets in a sheet processing machine is further known, which machine opens the opening. Each of the sheet stacks can pass through the opening while moving horizontally. This opening incorporates a barrier formed by a certain light phenomenon, which generates a stop signal when there is intervention in itself. This stop signal is applied to stop the lift drive that acts as a vertical movement of the sheet stack or to stop the sheet processing machine. This protects the operator from injury from the gripping system. The possibility of performing handling operations in the stack chamber, such as stack interrupts or stack modifications, is limited as long as this leads to an undesired stop of the sheet processing machine.
German Patent Application No. 103 10 236 B3 European Patent Application Publication No. 1 059 257 A2 German Patent Application Publication No. 197 01 645 A1

  The present invention provides for an unintentional interruption in the sheet dispenser of a sheet processing machine in the case of an acceptable operation by the operator in maintaining the accessibility of the stack chamber to perform the handling operation. This is based on the challenge of creating safety equipment that can be reduced.

  This problem is solved according to the invention by a safety facility of the kind extended to the beginning, which is pointed out by the features of claim 1 in the claims. Advantageous embodiments are the subject of the dependent claims.

  At least one sensor is incorporated in each access area, and in this case, a light barrier is preferably provided as the sensor. The number and arrangement of sensors incorporated in the access area depends on their spatial extent. The placement is performed such that at least one of the sensors reacts in the case of an operator entry into the access area. Selections regarding the entry / exit area for taking out the sheet trial print extend directly to the lower side of the transport system along one side of the sheet dispenser incorporating the sheet trial print take-out device. The choice for the access area provided for taking out the sheet stack extends over the height of the stack chamber along the side of the sheet delivery device, and the choice for insertion of the stack transporter is the sheet It extends directly above the installation plane of the sheet delivery device along the side of the delivery device.

  At least the next lower light barrier is accompanied by a short time delay as it may block one lower light barrier in the case of large sheet format sheet trials. . Thus, the sheet that passes through the light barrier does not actuate the stop of the sheet processing machine as it is drawn from the stack chamber. In the preferred embodiment, the control is tied to the release selection of the upper light barrier for removing the sheet proof.

  Time delays can be planned for all grabbing areas where the light barrier can unexpectedly break for a short time.

  Based on the embodiments, the following invention will be described in more detail with reference to the accompanying drawings.

  Subsequently, an improvement of the sheet feeding device 1 of the sheet processing machine will be described.

  The sheet feeding apparatus 1 includes a drive unit (not shown), and this drive unit drives a conveyance system having a pick-up formed as a chain conveyor in a known manner. The pick-up carrier receives the processed sheet from the last processing operation of the sheet processing machine and sends it to the stack chamber spread in the sheet feeding device 1 below the transport system. Here, the sheets are placed on the pallet 3 to form a sheet stack 4. In order to pick up the printed sheets, a stack support plate 2 supported by a stack lift chain is provided, and the stack support plate 2 is gradually lowered during sheet processing. When the maximum stack height is reached, the sheet stack 4 together with the stack support plate 2 is lowered to the floor height and conveyed laterally or from the sheet delivery device 1 in the longitudinal direction and thus from the stack chamber. Subsequently, a new empty pallet 3 is fitted into the stack chamber and raised to the production level by the stack support plate 2.

  The stack chamber is freely accessible through the access area on three sides that are not suitable for sheet processing machines to carry out handling operations. The entry / exit area to / from the stack chamber refers to all areas through which the stack chamber can be grasped based on the structural shape of the sheet feeding device 1. In the other structure of the sheet feeding device 1 (not shown), the area of the entrance / exit is limited to one side or both sides of the sheet feeding device 1 or a part of these sides accordingly. Can do. This is the case, for example, when the stack chamber of the sheet delivery device 1 is safeguarded against dangerous gripping work by the operator by means of an additional protection.

  Each access area incorporates at least one sensor 5.1-5.3, preferably formed as a light barrier, which responds to operator intrusion. Sensors 5.1-5.3 are integrated on three sides of the stack chamber in association with the process of the access area. A plurality of sensors 5.1 to 5.3 are provided on each of the three sides, and each bottom sensor 5.3 is at a distance of about 300 mm above the placement level of the sheet feeding device 1, and each top sensor 5.1 is The upper part of the stack chamber is about 400 mm below the lower edge of the component, and this upper part should be grabbed under the handling operation in the stack chamber, with each intermediate sensor 5.2 at the bottom Located in the center between sensor 5.3 and top sensor 5.1.

  Sensors 5.1, 5.2, and 5.3 formed as light barriers are components of safety equipment, and this safety equipment, together with the drive part of the transport system of the sheet feeding device 1, has a drive part when an intrusion is detected. Work together to be stopped. This virtually eliminates the risk of injury from moving parts of the transporter system during continued printing. This is because the dangerous movement stops when the operator approaches.

  The safety equipment includes an input device, where input can be heard by the operator, whereby individual access areas can be determined for upcoming handling operations. For this purpose, a key is formed as a component of the input device, which represents a handling operation carried out in the stack chamber each time, in particular for the removal of the sheet stack and the installation of the pallet 3. Each key is arranged on the side where the handling operation represented by the respective key of the sheet feeding apparatus 1 will pass.

  An entry / exit area and a time interval belong to each possible handling operation, and the entry / exit area is stored in a value memory. The time interval is 20 seconds.

  FIG. 2 shows an entry / exit area for taking out the sheet stack 4, and the entry / exit area extends along the front side of the sheet feeding apparatus 1 and has sensors 5.1 to 5.3. This integration can also be done in one of the side access areas. According to FIG. 2, the entry / exit area for taking out the sheet stack 4 or loading a new pallet 3 can be attributed to the sensor 5.3, the operational relationship with the sensor drive being a certain time interval It can be switched off only by key operation.

  In order to simplify the handling operation, it is possible to consider the relationship by the entry / exit area to which the release switching belongs. For this purpose, a separate key is formed for taking the sheet stack 4 into the input device in connection with the loading of a new pallet 3. In the operation of this key, the release switching of the sensors 5.1 to 5.3 is first performed at a time interval of 20 seconds for the entry into the entrance / exit area on one side of the sheet feeding device 1 below the transport system and at the floor portion. Intrusion into the access area that is directly above and extends along the side of the sheet delivery apparatus 1 itself is switched to release for a time interval of 10 seconds.

  The present invention allows further rationalization of operation in maintaining safety standards. For this reason, the sheet delivery device 1 is provided with the sensor 10 fixed to the height of the pallet 3 standing on the floor. The sensor 10 can be a scanning line camera or a CCD camera. The sensor 10 grasps the state of the pallet 3 or the sheet stack 4 standing on the stack support plate 2, and in this case, the view presented to the sensor is grasped by contrast. When the sheet stack 4 or pallet 3 moves, the contrast changes. This makes it possible to output a corresponding signal by evaluating the grasped image.

When the corresponding key is operated as described above in the course of operation, the sensor 10 is used as follows when the stack is replaced.
1. The stack support plate 2 descends to the floor together with the pallet 3 and the overlying sheet. From this operation progress, the machine control unit recognizes that the sheet is lying on the pallet 3. For this reason, the machine must be switched off after the next regular production process.
2. Depending on the take-out side of the sheet delivery device 1 defined in the control, the corresponding entry / exit area is switched to release within the area of the sensor 5.3. This allows the lift carrier to enter to grab the pallet 3 on the stack support plate 2. Furthermore, the sensors 5.1 and 5.2 are rapidly switched.
3. The sheet stack 4 is lifted onto the pallet 3 by a lift carrier. Accordingly, the movement of the sheet stack 4 or the pallet 3 is recognized by the sensor 10.
4. Sensors 5.1 and 5.2 are automatically switched off by the motion signal of sensor 10 through safety equipment control or machine control.
5. The sheet stack 4 is pulled out of the stack chamber at a predetermined time interval of, for example, 10 seconds.
6. Sensors 5.1 to 5.3 are switched rapidly again.

  Controls that can be compared can be applied under the application of the sensor 10 for the loading of a new pallet 3. This allows the sensor 10 to communicate the presence of the pallet 3 and its final positioning.

It is the schematic of the sheet delivery apparatus of a sheet processing machine. It is a front view of a sheet feeding apparatus.

Explanation of symbols

Single sheet delivery device
2 stacks
3 palettes
Four sheets stack
5.1 Sensor
5.2 Sensor
5.3 Sensor
10 Sensor

Claims (6)

In the device to make the sheet feeding device in the sheet processing machine safe in the region from the entrance / exit area inside the sheet feeding device to the stack chamber, the stack of the feeding device can be raised and lowered inside the stack chamber A plurality of sensors (5.1 to 5.3) arranged in all the access areas of the sheet feeding device, the sheets being stacked using a transport system , A deployed sensor (5.1-5.3) is associated with the machine control to stop the sheet processing machine in case of unauthorized entry into the stack chamber and has at least one input facility in each access area. The sensors (5.1 to 5.3) arranged in the individual entry / exit areas by the input equipment prevent the sheet processing machine from stopping for a limited time range when entering the stack chamber. In And in order to carry out the work process in the state of entering the stack chamber, it is a safety device that can be cut off only during the time range,
In order to grasp the movement of the stack (4) of the delivery device or the pallet (3) that supports the stack (4) of the delivery device in the area of the stack chamber, the sensors (5.1 to 5.3) arranged in the access area are released. and wherein the sensor (10) is provided having a function of only the release switching fixed time intervals with. According to claim 1 sensor for grasping the movement of the pallet (3) for supporting the stack (4) of the stack (4) or the dispensing apparatus of the dispensing device (10), wherein the camera der Rukoto apparatus. The sensor (10) for grasping the movement of the stack (4) of the feeding device or the pallet (3) that supports the stack (4) of the feeding device is the movement of the pallet (3) or the sheet stack (4). the apparatus of claim 2, characterized in that the grasp by the comparing the scanned image. By the sensor (10) for grasping the movement of the stack (4) of the dispensing device or the stack (4) of the dispensing device (4) , the pallet (3) or the sheet stack (4), 4. The movement in all the spreading directions, as well as the plane extension direction, and the movement in the lift direction of the stack substantially perpendicular thereto can be grasped. apparatus. A sensor (5.1) disposed in the access area by a signal generated by the sensor (10) for grasping the movement of the stack (4) of the delivery device or the pallet (3) that supports the stack (4) of the delivery device. -5.3) the movement of the feeding device stack (4) or the pallet (3) supporting the feeding device stack (4) such that one or more of the feeding devices can be released and switched in a pre-given manner 5. The device according to claim 1 , wherein the sensor for grasping (10) is related to safety equipment and circuit technology. The entry / exit in the immediate vicinity of the floor, caused by a signal generated by a sensor (10) for grasping the movement of the stack (4) of the dispenser or the pallet (3) supporting the stack (4) of the dispenser By releasing the sensor (5.3) arranged in the area, the sensor (5.1, 5.2) arranged in another entry / exit area can be switched in a manner that can be given in advance, for a predetermined entry / exit area. A sensor (10) for grasping the movement of the stack (4) of the feeding device or the pallet (3) that supports the stack (4) of the feeding device so that release switching is performed only at a fixed time interval. 6. The device according to claim 1, wherein the device is related to a circuit technology.

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