JP2006160526A - Device for folding flat half-finished product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate a setup operation by an operator required when an apparatus is changed when a mold for a half-finished product is changed in case when the half-finished product is not cut to be accurately orthogonal to each other. <P>SOLUTION: This device for folding a flat half-finished product 2 comprises a pocket type folding device having a pocket stopper 7 of which position can be adjusted, an adjusting means 16 capable of adjusting the direction of at least the pocket stopper 7, a sensor device 17 generating signals for characterizing a process in which the leading edge of the half-finished product 2 touches the pocket stopper 7 and a control part 21 evaluating the signals and controlling the adjusting means 16 so that the adjusting means can adjust the pocket stopper 7 to face the leading edge in a temporarily stationary direction within a delay time corresponding to a target value. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an apparatus for folding a flat semifinished product.

  Such a device is known, for example, from US Pat. The device disclosed in this document is a pocket-type folding device (Taschenfalzenrichtung) with an adjustable pocket stopper. A pocket-type folding device usually includes three rollers that rotate continuously during operation, and these rollers constitute a pair of conveying rollers and a pair of folding rollers, which are usually horizontal. And a roller common to one set of transport rollers and one set of folding rollers. The rollers form a transport gap together with one transport roller and A folding gap is formed together with the folding roller. These three rollers come with a fold pocket with a pocket entrance and an adjustable pocket stopper, and a flat semi-finished product (usually a printed sheet) that has passed through the transport gap is the pocket entrance. Through and into the folding pocket so that the front edge of the semi-finished product hits the pocket stopper. After the front edge hits the pocket stopper, the rotation of the pair of transport rollers continues, and a pocket-type fold formed between the transport gap and the pocket entrance occurs in the semi-finished product. This pocket fold then enters a fold gap that forms a fold in the region of the pocket. Then, the signature made at this time is carried out of the folding gap by a pair of folding rollers, with the fold line facing forward.

  The distance from the pocket entrance to the pocket ket stopper is a factor that determines the position of the fold (Falzbruch), particularly with respect to the aforementioned front edge. Therefore, the above-mentioned known apparatus is provided with an adjusting means in the form of a servo motor, which can be used to adjust the position of the pocket stopper while changing the distance from the pocket entrance.

  Of the set of folding rollers of the known device, the roller that does not belong to the set of transport rollers can be bent by a signature passing through the folding gap. Such deflection is detected by the sensor device, the signal of which is combined with the measured value of the length of the sheet that was carried by the control unit from when the sheet entered the device until it was folded, Thus, for example, when the position of the fold with respect to the front edge of the sheet is not correct, the control unit controls the servo motor described above to adjust the position of the pocket stopper so that the position of the fold is correct.

  The folding pocket known from Patent Document 2 has a pocket stopper that can be rotated around a point at the center in the longitudinal direction of the pocket stopper, in addition to the adjustment of the distance from the pocket entrance.

Such a pocket stopper orientation adjusting means is provided in preparation for the case where the aforementioned leading edge of the sheet to be folded does not extend correctly orthogonal to the sheet transport direction. is there. In order to adjust the pocket stopper of such a known folding pocket, a so-called reference operation is intended. This seems to mean a trial operation of the pocket folding device, in which the first sheet is folded and measured with respect to the position of the fold before the next sheet is folded. Referring to this measurement result, the pocket stopper is adjusted by the adjusting means in the form of each spindle drive at each end of the pocket stopper and each stepping motor that drives each spindle drive, and the crease This process is repeated until the pocket stopper orientation that provides the correct position is reached.
German Patent Application Publication No. 19747997A1 German Patent Application Publication 10023933A1

  The object of the present invention is that it is unnecessary for the case where the operator's setup work required in addition to the equipment change when the format of the semi-finished product is changed is not cut so that the semi-finished product is accurately orthogonal. Thus, it is to constitute a device for folding a flat semi-finished product.

  The purpose of this is to provide at least one pocket-type folding device with adjustable position, adjustment means for adjusting at least the orientation of the pocket stopper, and signals characterizing the process in which each front edge of the semi-finished product hits the pocket stopper. The sensor device to be generated and the adjusting means control the adjusting means by evaluating the signal so that the pocket stopper is adjusted so that the leading edge is temporarily stationary within a delay time corresponding to the target value. And a device for folding a flat semi-finished product.

  When it is desired to create a high-quality signature from the viewpoint of dimensional stability, the control unit is preferably configured so that the delay time is minimized.

  The delay time is determined depending on the aforementioned front edge direction of the semi-finished product and the direction of the pocket stopper. When the direction of the leading edge matches the direction of the pocket stopper, the minimum value of the delay time is obtained. In this case, theoretically, all points along the leading edge hit the pocket stopper simultaneously (assuming here that the pocket stopper has a closed stopper surface). Regardless of the direction of the front edge and the direction of the pocket stopper, each time the front edge hits the pocket stopper, noise is generated that changes the sound pressure level, particularly depending on the aforementioned direction. However, when the delay time is the shortest, the sound pressure level generated at that time becomes the maximum value in principle. In that sense, the sound pressure is a signal that characterizes the process by which each leading edge hits the pocket stopper, although different semi-finished products hit different pocket stoppers at different speeds, resulting in different maximum values. A measurement quantity that is particularly suitable for being generated by a sensor device. The sensor device provided for this purpose requires only one sound pressure sensor.

  If the sound pressure level measurement generates a signal that characterizes the process by which each leading edge of the semi-finished product hits the pocket stopper, the requirements for the control unit that controls the adjustment means, in particular, the length of the delay time as a target value. Is relatively small if a time slot is intended that is at least approximately equal to zero. In other words, in this case, since the measured value of the sound pressure level detected by the sensor device substantially reaches the minimum value as described above, the control unit saves the target value (which depends on many parameters) stored therein. The signal corresponding to the sound pressure level generated by the sensor device is evaluated, and the orientation of the pocket stopper is aligned with the direction of each front edge of the semi-finished product, so that the semi-finished product hits the pocket stopper. It is only designed to control the adjusting means so that the maximum value of the sound pressure level that will occur is finally at least approximately. In particular, the control unit is designed so that the adjustment movement of the adjustment means introduced by the control unit is maintained when the sound pressure level increases. If the sound pressure level is not increased, the control unit causes a change in direction of the introduced adjustment motion.

  To that end, the control unit compares successive signals that characterize the process by which each leading edge of successive semi-finished products hits the pocket stopper, and if these signals are generated by a sensor device that includes a sound pressure sensor, Compare the signals with respect to the magnitude of the sound pressure level caused by the successive semi-finished products hitting the pocket stopper, and in one advantageous embodiment, after the adjustment movement of the adjustment means has been initiated and optionally After the direction change is performed, the adjusting means is stopped when it is determined by comparison of the above-described signals that the sound pressure level is at least approximately equivalent to the maximum value unique to the job.

  In an advantageous development, the control unit outputs a target value signal representing the aforementioned level of sound pressure level, along with job-specific data (semi-finished product format, weight per unit area, etc.) for subsequent jobs of the same type. It can also be saved for recall.

  In the control unit of one modification, a target value signal unique to a job that is empirically grasped is stored from the beginning.

  In an alternative embodiment, the sensor device generates a signal characterizing the process by which each leading edge of the semi-finished product hits the pocket stopper based on the frequency spectrum of the noise caused when the semi-finished product hits the pocket stopper. The apparatus includes a frequency analyzer that compares the target value spectrum with the actual value spectrum stored in the control unit. The adjustment means is controlled so that the spectrum supplied from the sensor device matches the stored target value spectrum specific to the job in accordance with each comparison result. In this case as well, there may be a chance to change the direction of the adjusting motion that was initially introduced by the adjusting means. For such signal evaluation, in an advantageous embodiment, a digitally operated high speed controller with real-time processing capability is provided.

  Instead of the configuration of the control unit for storing the target value spectrum, in the configuration of the modified example, the control unit is an automatic learning type, as in the case of generating the signal corresponding to the sound pressure level described above, It operates on the principle of maximizing the actual value.

  In the embodiment described above, unlike the embodiment described in detail later, the sensor device is based on an event caused by the contact between the semi-finished product and the pocket stopper. A signal characterizing the process of hitting is generated. Such events include not only the generation of noise but also the movement of the pocket stopper and the elastic shape change.

  If the apparatus is connected to the pocket stopper symmetrically with respect to the center in the longitudinal direction, and semi-finished products having different sizes are aligned at the center in the longitudinal direction with respect to the processing direction of the pocket type folding apparatus (this is the first Signal that characterizes the process by which each leading edge of the semi-finished product hits the pocket stopper, even from the course of movement and shape changes described above, by means of a correspondingly designed sensor device. Can also be generated, and this signal can be evaluated by the controller relatively easily because measures are taken from a symmetry point of view.

  As already mentioned, the length of the time slot of the delay time until the front edge of each semi-finished product hits the pocket stopper and temporarily stops, the orientation of the stopper surface of the pocket stopper is the front of each semi-finished product. The more accurately it corresponds to the edge orientation, the closer it is to zero.

  In the ideal state pursued by the proposed device, where the direction of the stopper surface of the pocket stopper matches the direction of each front edge of the semi-finished product, if measures are taken from the point of view of symmetry, The movement and shape change of the pocket stopper due to the contact with the finished product is symmetrical with respect to the longitudinal center of the pocket stopper.

  The sensor device described above includes a detector for obtaining a measurement value of the movement or shape change of the pocket stopper according to the embodiment of the device, and is characterized by a process in which each front edge of the semi-finished product hits the pocket stopper. A corresponding signal which is then evaluated by the control unit so that the adjustment means adjust the pocket stopper in an orientation indicating that the measured value is at least substantially symmetric with respect to the longitudinal center of the pocket stopper. And used to control the adjusting means.

  For this purpose, the sensor device detects the actual value of the course of movement or the shape change at a point symmetrical about the longitudinal center of the pocket stopper, depending on the embodiment. The evaluation of the signal by the control unit is performed based on a comparison of measured values obtained at symmetrical points.

  By detecting the actual value symmetric to the center, the control unit can provide the adjusting means with the adjusting movement in the correct direction from the beginning. When the direction of the pocket stopper matches the setting, the control unit stops the adjusting means.

  In an alternative embodiment of the device, a signal characterizing the process by which each leading edge of the semi-finished product hits the pocket stopper is already generated on the way of the semi-finished product in the direction towards the pocket stopper. For this purpose, the sensor device includes a detector that generates an orientation signal that characterizes the orientation of each front edge of the semi-finished product that moves toward the pocket stopper, and the control unit evaluates the orientation signal. , Configured to control the adjusting means so that the orientation of the pocket stopper matches the orientation of each front edge of the semi-finished product.

  This orientation signal, which characterizes the orientation of the leading edge, also allows the control unit to give the control means an adjustment movement in the right direction from the beginning and to stop the adjustment means when the pocket stopper orientation matches the setting. It is.

  Next, embodiments of the present invention will be described with reference to the drawings.

  The pocket-type folder 1 schematically shown in FIG. 1 is designed to fold a flat semi-finished product 2 as an example by way of example, so that each is shown (only shown in the case of a folding pocket 3). It has four folding pockets 3 to 6 with pocket stoppers 7 that can be adjusted. Semi-finished flat semi-finished product 2 in which a set of rollers (consisting of conveyance roller 8 and conveyance / folding roller 9) is supplied in the direction of the arrow on the right side of FIG. The product 2 is fed into the first folding pocket 3 until the front edge 2.1 of the product 2 hits the pocket stopper 7 and the above-described pocket-type folding is formed, and this pocket then feeds the conveying / folding roller 9 and the folding / conveying roller. The fold nip between 10 and 10 is entered, where the first fold is performed. The folding / conveying roller 10 cooperates with the conveying / folding roller 9 to feed the resulting signature 2 'to the second folding pocket 4 in front of the fold, and the same process proceeds. In this process, folding / conveying is performed. A crease is formed at the folding nip between the roller 10 and the folding / conveying roller 11, and this folding / conveying roller 11 functions as a conveying roller in cooperation with the folding / conveying roller 10 in the subsequent process, and so on. Finally, the semi-finished product reaches the last folding pocket (in this example, the fourth folding pocket among the four folding pockets), and the final folding is performed by the last set of rollers 12.

  The set of rollers 12 for final folding is usually followed by a set of slitter shafts 13 for cutting the signature 2 'and a subsequent feed roller 14. The pocket stoppers 7 of all the folding pockets 3 to 6 can be adjusted according to the length of one side of the signature (Schenkelagen) sequentially formed from one semi-finished product when a plurality of folding pockets 7 are diffracted. Furthermore, at least the pocket stopper 7 of the first folding pocket 3 can be adjusted in different directions. This is because in the first folding pocket 3, the flat unfinished product 2 that is not folded may have a front edge 2.1 that extends obliquely with respect to each roller of the apparatus.

  The embodiment shown in FIGS. 2 to 5 particularly relates to the first pocket type folding device in the case of a pocket type folding machine including a plurality of pocket type folding devices, and includes the sensor device and the control described above. It differs only in the configuration of the parts. In other respects, a folding pocket frame 15, a position-adjustable and adjustable pocket stopper 7 and an adjusting means 16 arranged on the folding pocket frame 15 acting in each end area are provided. In this sense, the embodiments are of the same type mechanically.

  The adjusting means 16 is configured in accordance with the example of a folding pocket in the form of two spindle drives known from, for example, US Pat. No. 6,096,096, and therefore adjusts the pocket stopper 7 in accordance with the length of one side of each signature. In addition, it is suitable for adjusting the orientation of the stopper surface of the pocket stopper 7 in a manner not shown in detail, i.e., aligning the orientation with the orientation of each front edge 2.1 of the semi-finished product 2. Also suitable for. Refer to Patent Document 2 for a detailed description of the adjusting means 16 in this regard.

  In order to generate a signal characterizing the process in which each leading edge 2.1 of the semi-finished product 2 hits, as already mentioned, according to any of the embodiments of FIGS. A sensor device 17 or 18 or 19 or 20 is provided which sends a signal in particular digital form to a control unit 21 or 22 or 23 or 24 configured according to any of the embodiments, after which the control unit Control the adjustment means 16 (as described in the previous embodiment).

  FIG. 2 shows a case where the sensor device 17 includes a sound pressure sensor 17.1 illustrated by a commercially available microphone as an example. This microphone is preferably placed in the immediate vicinity of the pocket stopper.

  If a frequency spectrum is detected when a signal is generated that characterizes the process by which the semi-finished product 2 hits the pocket stopper, it also includes a commercially available microphone to detect the actual value spectrum and incorporates a frequency analyzer. A sensor device is provided.

  FIG. 3 shows a case where the sensor device 18 is provided with a detector 18.1 for obtaining a measured value of the movement of the pocket stopper 7 due to the semi-finished product 2 being hit. The detector 18.1 is illustrated by a commercially available acceleration sensor as an example. The acceleration sensor itself is tightly coupled with at least the pocket stopper 7 and is preferably arranged symmetrically with respect to the longitudinal center of the pocket stopper.

  FIG. 4 shows a case where the sensor device 19 includes a detector 19.1 that obtains a measurement value of the elastic shape change of the pocket stopper 7. FIG. The detector 19.1 is illustrated by a resistance gauge as an example, and is preferably arranged symmetrically with respect to the longitudinal center of the pocket stopper 7, and when arranged in the folding pocket frame 15 as shown in FIG. 7 is detected indirectly, that is, the shape change of the pocket stopper 7 is indirectly detected.

  In FIG. 5, the sensor device 20 includes a detector 20.1 that generates an orientation signal that characterizes the orientation of each leading edge 2.1 of the semi-finished product 2 that moves toward the pocket stopper 7. Suitable detectors and their arrangement are described in detail, for example, in DE 19950603 A1. When the sensor device is embodied as shown in FIG. 5, the same document can be referred to.

  The detector 20.1 is preferably arranged so that its position can be adjusted in the longitudinal direction of the pocket stopper so that it can be used in various formats of the semi-finished product 2.

  The arrangement of the detector 20.1 in the immediate vicinity of the pocket stopper 7, which is intended as an example in FIG. 5, is not absolutely necessary. However, if an arrangement of this kind is intended, the detector 20.1 can be adjusted with the pocket pocket 7 to match the length of one side of the signature that changes when the job is changed. Is preferred. Therefore, in the present embodiment, it is preferable to use one of the spindle drives constituting the adjusting means 16.

  For a case where the setup work required in addition to the equipment change when the format of the semi-finished product 2 is changed by the apparatus having such equipment is not cut so that the semi-finished product 2 is accurately orthogonal. It becomes unnecessary.

FIG. 1 is a schematic diagram showing an apparatus for folding a flat semi-finished product in the form of a pocket folding machine with four pocket folding devices as an example only; FIG. 4 shows a frame and a pocket stopper of a folding pocket that can be adjusted and adjusted by an adjusting means, generating a signal that characterizes the process in which each front edge of the semi-finished product hits the pocket stopper, illustrated by symbols The sensor device of the embodiment and a control unit that evaluates this signal and controls the adjusting means are provided. FIG. 4 shows a frame and a pocket stopper of a folding pocket that can be adjusted and adjusted by an adjusting means, generating a signal that characterizes the process in which each front edge of the semi-finished product hits the pocket stopper, illustrated by symbols The sensor device of the embodiment and a control unit that evaluates this signal and controls the adjusting means are provided. FIG. 4 shows a frame and a pocket stopper of a folding pocket that can be adjusted and adjusted by an adjusting means, generating a signal that characterizes the process in which each front edge of the semi-finished product hits the pocket stopper, illustrated by symbols The sensor device of the embodiment and a control unit that evaluates this signal and controls the adjusting means are provided. FIG. 4 shows a frame and a pocket stopper of a folding pocket that can be adjusted and adjusted by an adjusting means, generating a signal that characterizes the process in which each front edge of the semi-finished product hits the pocket stopper, illustrated by symbols The sensor device of the embodiment and a control unit that evaluates this signal and controls the adjusting means are provided.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pocket type folding machine 2 Flat semi-finished product 2 'signature 2.1 Front edge of semi-finished product 2 3 Folding pocket 4 Folding pocket 5 Folding pocket 6 Folding pocket 7 Pocket stopper 8 Conveying roller 9 Conveying / folding roller 10 Folding Conveying roller 11 Folding / conveying roller 12 1 set of rollers 13 1 set of slitter shaft 14 Sending roller 15 Folding pocket frame 16 Adjusting means 17 Sensor device 17.1 Sound pressure sensor 18 Sensor device 18.1 Movement of pocket stopper 7 Progress detector 19 Sensor device 19.1 Elastic shape change detector of pocket stopper 7 20 Sensor device 20.1 Detector for generating a direction signal 21 Control unit 22 Control unit 23 Control unit 24 Control unit

Claims (5)

At least one pocket-type folding device with a position-adjustable pocket stopper (7);
Adjusting means (16) capable of adjusting at least the orientation of the pocket stopper (7);
A sensor device (17; 18; 19; 20) for generating a signal characterizing the process in which each leading edge (2.1) of the semi-finished product (2) hits the pocket stopper (7);
The adjusting means (16) adjusts the orientation of the pocket stopper (7) so that the leading edge (2.1) is temporarily stationary within a delay time corresponding to a target value, A device for folding a flat semi-finished product, comprising a control unit (21; 22; 23; 24) for evaluating and controlling the signal.   2. The device according to claim 1, comprising a configuration of the control unit (21; 22; 23; 24) for reducing the delay time to a time slot whose length is at least approximately equal to zero.   2. The device according to claim 1, wherein the sensor device (17) comprises a sound pressure sensor (17.1). The sensor device (18; 19) is a detector (18.1; 19..) That obtains a measurement of the course of movement or the elastic shape change of the pocket stopper (7) due to the semi-finished product (2) hitting it. 1)
The adjusting means evaluates the signal to adjust the pocket stopper (7) in an orientation indicating that the measured value is at least substantially symmetric with respect to the longitudinal center of the pocket stopper (7) and The controller (22; 23) is configured to control the adjusting means (16).
The apparatus of claim 1. A detector (20.) that generates an orientation signal that characterizes the orientation of each leading edge (2.1) of the semi-finished product (2) in which the sensor device (20) moves closer to the pocket stopper (7). 1)
The orientation signal is evaluated to control the adjusting means (16) so that the orientation of the pocket stopper (7) matches the orientation of the detected front edge (2.1) of the semi-finished product (2). Having the configuration of the control unit (24),
The apparatus of claim 1.

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