US3287015A - Detecting device for the sheet feeder of a printing press - Google Patents

Detecting device for the sheet feeder of a printing press Download PDF

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Publication number
US3287015A
US3287015A US426943A US42694365A US3287015A US 3287015 A US3287015 A US 3287015A US 426943 A US426943 A US 426943A US 42694365 A US42694365 A US 42694365A US 3287015 A US3287015 A US 3287015A
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sheets
rollers
detecting device
detectors
lever
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US426943A
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English (en)
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Presuss Friedrich
Ruckert Walter
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Roland Offsetmaschinenfabrik Faber and Schleicher AG
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Roland Offsetmaschinenfabrik Faber and Schleicher AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H7/00—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles
    • B65H7/02—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2553/00—Sensing or detecting means
    • B65H2553/20—Sensing or detecting means using electric elements
    • B65H2553/23—Capacitive detectors, e.g. electrode arrangements

Definitions

  • the invention relates to a detecting device for use with a sheet printing press for detecting the absence of sheets consecutively fed by a sheet feeder from a stack of sheets to the forward stops of the press and also for detecting the occurrence of doubled-up sheets in the feed path.
  • the invention relates to a detecting evice of the general kind above referred to which includes two detectors spaced apart from each other in the direction of the feed path. Each of the two detectors generates a signal which is indicative of the thickness of the sheet material detected by the respective detector and these signals are compared as to the differential between the two detected thickneses of the sheet material. In the event the differential between the two signals exceeds a predetermined value, a control signal is generated causing the press to be stopped or otherwise controlled in a conventional fashion.
  • Sheet feeders for presses to be practical should be capable of handling all sheet sizes between a maximum and a minimum size and also sheets of widely different gauges.
  • detecting time may be available during each cycle of the press and such short detecting time may affect the reliability of the detecting device.
  • a more specific object of the invention is to provide a novel and improved detecting device including two detectors which does not need to be specifically adjusted for the gauge of the sheets to be supervised or the dimensions thereof, thereby greatly simplifying the operation of the detecting device.
  • Another more specific object of the invention is to provide a novel and improved detecting device which is operative during the full cycle of the printing press, thereby assuring that the feed of sheets is continuously superv-ised.
  • Still another more specific object of the invention is i to provide a novel and improved detecting device which is capable of distinguishing between heavy gauges of sheet material and lighter gauges, in that the detecting either roller from a predetermined position.
  • the device generates a control signal at greater difierentials between the signals produced by the detectors when heavy gauge sheets are fed than sheets of lighter gauge. This has the advantage that the detecting device always responds at approximately the same percentage of a departure from the correct thickness of the sheet material, for instance due to the presence of a doubled-up sheet, irrespective of the gauge of the sheet material to be supervised. If the detecting devices would be operated always with the same absolute sensitivity and such sensitivity would be adjusted according to the lightest gauge, the device, when used for carboard might produce a control signal in response to thickness variations that are within the tolerance range for such heavy material.
  • the invention also contemplates providing in one of the detectors two probes, the distance of which in the direct-ion of the sheet travel firom the other detector is larger and smaller respectively by substantially the same amount as the aforesaid spacing of the sheets from each other in said train of sheets whereby the detector including the two probes transmits a signal for comparison with the signal of the other detector only when'the signal produced by the two probes are approximately equal.
  • the detecting device tends to respond, since with such irregular sheets the same number of sheets is not necessarily present when the leading edge and the trailing edge respectively of the sheets passes the two detectors. Another result of inaccurately cut sheets or uncut sheets would be that the aforesaid Overlap spacing between adjacent sheets would be changed. By providing the aforedescribed two probes in one of the detectors such fa-ut-ly indications due to inaccurately or uncut sheets are avoided.
  • the invention further contemplates providing for each detector a stationar-ily mounted roller, which coacts with a yieldably supported roller whereby the axial distance between the two coacting rollers constitutes a measure of the thickness of the sheet material between the rollers.
  • a stationar-ily mounted roller which coacts with a yieldably supported roller whereby the axial distance between the two coacting rollers constitutes a measure of the thickness of the sheet material between the rollers.
  • the invention also provides coupling the yieldably supported rollers of the two detectors by a yieldable linkage which operates a switch in response to a displacement of Such operation of the switch may be utilized to initiate suitable control operations.
  • a switch control of this kind is reliable and can be conveniently serviced.
  • the invention further contemplates providing means for intermittently lifting the yieldable rollers of the two detectors to insure a free run-in of the leading edges of the sheets thereby assuring that the sheets reach the feed table of the press in a wrinkle-free condition.
  • the invention provides that the yieldable roller of the detector including the two probes is supported on one arm of a bell crank lever, the other arm of which mounts two lugs which are disposed at different distances from the pivot axis of the lever. These lugs coact with switch rected and cross each other.
  • control assembly is simple and rugged and can be conveniently checked when in operation.
  • the invention also provides for the purpose of differentiating between different sheet gauges that each of the yieldably supported rollers of the two detectors is mounted on a pivotal lever.
  • the two levers are oppositely di-
  • Each lever carries at one end a switch which coacts with a preferably adjustable abutment part on the other lever to effect operation of switches initiating control functions in predetermined angular positions of the two levers in reference to each other.
  • the invention further contemplates utilizing the variable spacing between two coacting rollers, which as previously pointed out, is indicative of the thickness of the sheet material passing between the rollers, for operating a mechanical-electrical converter preferably with a nonlinear characteristic.
  • the invention contemplates providing across the bridge output terminals a circuit component which produces a control signal in response to a predetermined and preferably adjustable imbalance of the bridge. If the bridge is designed with a linear characteristic, the detecting device responds to the same differential between the signals of the detectors irrespective of the gauge of the sheet material to be supervised.
  • FIG. 1 is a diagrammatic elevational side view of the detecting device according to the invention coacting with the feed table of a printing press
  • FIG. 2 is a fragmentary detail view of FIG. 1 on an enlarged scale
  • FIG. 3 is a plan view of FIG. 2,
  • FIG. 4 is a side view of FIG. 2,
  • FIG. 5 is a diagram of the control circuit controlled by the device of FIG. 1,
  • FIG. 6 is an elevational side view of a modified detecting device having two probes in one of the detectors of the device, 7
  • FIG. 7 is a fragmentary view of FIG. 6 on an enlarged scale
  • FIG. 8 is a diagram of the operational movements of some of the components of the detecting device according to FIG. 6,
  • FIG. 9 is a diagram of the control circuit controlled by the device of FIG. 6,
  • FIG. 10 is a diagrammatic elevational view of another modification of the detecting device.
  • FIG. 11 is a detail view of part of FIG. 10 in a different operational position of the detecting device
  • FIG. 12 is a diagram of the operational movements of slrame of the components of the device according to FIG.
  • FIG. 13 is a fragmentary diagrammatic view of a detecting device using capacitative detectors
  • FIG. 14 is fCiICUit diagram for a detecting device using capacitative detectors
  • FIG. 15 is a fragmentary view showing a modification of the detectors for detecting devices as shown in FIGS. 1 to 12;
  • FIG. 16 is a graph showing the characteristics of a detector according to FIG. 15.
  • FIG. 1 Referring first to FIGS. 1 through 4 in detail, FIG. 1
  • FIG. 1 shows a stack 3 of sheets from which sheets 1, such as paper sheets, are successively withdrawn by a suitable pick-up device shown as a suction cup 2.
  • the individual sheets are placed with overlap upon a feed table 4 on which they are transported in the form of a continuous train of overlapping or shingled sheets to the front markers 6 of a diagrammatically indicated printing press 7.
  • the lifting and the transport of the sheets are assumed to be conventional and do not constitute part of the invention.
  • the conveyor 5 includes a roller 8 which coacts with a roller 9 mounted on an arm of a three-arm lever 10. Several rollers 9 may be provided, and roller 8 may extend across the width of table 4.
  • a second arm 10a of the lever coacts by means of a cam follower 13 with a unidirectionally rotated cam disk 11 whereby the rollers 9 are intermittently lifted in reference to roller 8 to permit a free and smooth run-in the leading edge of Sue-. cessive sheets 1.
  • a loaded spring 12 may be provided or equal .to an integral multiple of the spacing, the socalled overlap spacing.
  • a rod 18 links arm 10b of lever 10, which arm is substantially normal to the plane of table 4, to the arm 16a of lever 16, which arm is also substantially normal to the plane of table 4.
  • an elongated slot 19 in rod 18 engaged by a bolt 101 permits a limitedangular movement of lever arm 16a in reference to rod v1'8.
  • An extension20 of lever arm 16a mounts on eachside a lug 102 coacting with switches 21 and 22 supported on rod 18.
  • the positions of switches 21 and 22 in reference to rod 18 and thus in reference to extension 20 and the lugs thereon may be adjusted by set screws 103 engaging slots 102a in rod 18 or by other suitable means.
  • Lever arm 16a is adjusted so that lugs 102 thereon will not operate either one of switches 21 105.
  • Solenoid 104 should be visualized as constituting part of a conventional control circuit system which. may stop the press, or initiate another appropriate control action.
  • the sensitivity of the detector may be adjusted by varying the spacing of switches 21 and 22 in reference to lugs 102 on the extension 20 of lever arm 16a.
  • roller 9 is intermittently lifted by the action of cam disk 11. Such lifting of the roller causes a movement of rod 18 towards the left and thus an operation of switch 22 and also a lifting of roller 15. To prevent an energization of solenoid .104
  • a normally closed switch 23 is provided in the connection between solenoid 104 and source of current 105.
  • Switch 23 is controlled by an extension 24 of lever arm 10a and opened whenever cam disk 11 acts upon follower 13, thereby rendering ineffective the closing of switch 22.
  • the detecting device comprises two probes in one of the two detectors of the device.
  • the roller pairs 25, 26 and 27, 28 of FIG. 6 correspond functionally to rollers 14 and 15 of FIG. 1.
  • the distance A is again equal to the overlap spacing of the train of sheets.
  • the spacing between roller 25, 26 and roller 8, 9 is greater than the distance A by a distance which is equal to the distance by'which the spacing between rollers 27, 28' and rollers 8, 9 is smaller than the distance A.
  • Rollers 8, 9, 25, 26, 27 and 28 may extend across the entire width of table 4.
  • Roller 9 is supported on one arm of a pivotal threearm lever 29, an arm 30 of which pivotally supports one end of a rod 31.
  • the other end of rod 31 is linked to a lever 32, the other end of which is pivotally mounted about a stationary pivot point 32a.
  • Roller 26 is supported by a bell crank lever 33 and roller 28 by a bell crank lever 34.
  • Loaded tension springs 35 and 35a urge rollers 26 and 28 respectively toward rollers 25 and 27 respectively.
  • the arms 33a and 34a of levers 33 and 34 respectively are approximately normal to the plane of table 4 and mount lugs 36, 36a and 37, 37a respectively.
  • the distance of lugs 36, 36a from the pivot axes of levers 33 and 34 respectively is smaller by a predetermined distance than the length of lever arms 30 and 32 and the distance between lugs 37 and 37a from the pivot axes of lever 33 and 34 respectively is larger by the same amount.
  • the point 40 in FIG. 7 signifies the point at which rod 31 is linked to lever 30.
  • the eccentric lugs 36, 36a and 37, 37a are adjusted in accordance with the desired detecting sensitivity to wit: so that the switches 38, 38a and 39 39a are closed only after a predetermined movement of lever arms 33a and 34a in reference to rod 31. More specifically, the lugs may be so adjusted that for thin paper the lugs 36 and 37 must move into the positions indicated at 136 and 137 respectively to efiect operation of switches 38 and 39 respectively.
  • Line 41 indicates the positions in which the lugs will operate the switches.
  • the dotted lines in FIG. 8 indicate the required movements for a heavy gauge of paper or cardboard.
  • the line 41 has moved into the dotted line position 41 and the point 40 into the position 40. Accordingly, the switches 38 and 39 are operated when point 36' has moved into the position 236 and point 37' into the position 237. As it is evident, the distance between point .36 and point 236 and between point 37' and point 237 are greater than the distances from point 36 to point 136 and from point 37 to point 137. Accordingly, the absolute detecting sensitivity is correspondingly reduced for heavier gauges of sheet material. The aforedescribed geometric proportions can be conveniently so adjusted that the relative detecting sensitivity remains approximately the same for each gauge of the sheet material. Accordingly, the detecting device will respond only when a sheet is missing or sheets are doubled up but not to tolerances in gauge which are acceptable for heavier types of cardboard and are in the order of magnitude of the gauge of very thin paper.
  • switches 38 and 38a are connected in series so that the energizing circuit for solenoid 106 through source of current 107 is closed only when both switches are closed at the same time.
  • Solenoid 106 should again be visualized as being connected to or constituting part of a suitable control circuit for the press. Similarily, switches 39 and 39a are connected in series so that both of these switches must also be simultaneously closed to establish the energizing circuit for solenoid 106.
  • a normally closed switch 23a is opened by lever 30 whenever lever 29 is pivoted by the coaction between cam disk 11 and follower 13.
  • rollers 42, 43 correspond to rollers 8, 9 of FIG. 2; rollers 44, 45 correspond to rollers 25, 26 and rollers 46, 47 correspond to rollers 27, 28.
  • Roller 43 is supported on a lever 48; roller 44 on a lever 49 and roller 46 on a lever 50.
  • levers 48, 49 and 50 are two-arm levers pivotal about pivot axes 48a, 49a and 50a. The levers extend in opposite directions and cross each other. The free ends of the levers support switches 51, 52, 53 and 54 respectively.
  • switches are operable by engagement with preferably adjustable abutment members 55, 56, 57 and 58 on levers 49, 48, 50 and 48.
  • Rollers 44, 45 and 46, 47 are disposed side by side adjacent to each other.
  • Tension springs 55, 60 and 61 urge rollers 43, 44 and 46 toward the respectiv counter rollers 42, 45 and 47.
  • switches 51 through 54 are spaced apart from the respective abutments 55 through 58.
  • the angular position of lever 48 in reference to lever 49 changes accordingly thereby causing operation of switches 52 and 54 by engagement with abutment portions 56 and 58.
  • the control circuit means are activated in the manner described in connection with FIG. 9.
  • switches 51 and 53 are operated when a sheet is missing between rollers 42 and 43.
  • Adjustment of abutment members 55 through 58 may be effected in any suitable and conventional manner, for instance by providing set screws or eccentric lugs of the kind shown in FIG. 7 and described in connection therewith.
  • a unidirectionally rotating cam disk 62 acts upon a pivotally mounted bell crank lever 63 by means of a cam follower 65.
  • a tension spring 64 acting upon lever 63 urges follower 65 toward the cam disk.
  • a rod 66 linked to arm 63a of lever 63 couples the lever arm with two bars 67 and 68 which, in turn, coact with levers 48, 49 and 50 by means of rollers 69 and 70 respectively.
  • rotation of cam disk 62 will cause an intermittent lifting of levers 48, 49 and 50 to provide for a free run-in of the leading edges of the sheets between the respective rollers to assure a substantially wrinklefree transport of the sheets.
  • a special switch to prevent generation of a control signal when the levers are lifted, such as switches 23 and 23a, is not necessary in this arrangement since the intermittent lifting of levers 48, 49 and 50 separates switches 51 through 54 from the respective abutment members 55 through 58.
  • the automatic variation of the sensitivity of the detecting device in accordance with the specific gauge of the sheet material to be supervised is apparent from the diagram of FIG. 12 in which are shown the movement performed by switch 51 and its abutment member 55.
  • the full lines represent the positions for thin sheets and the dotted lines for heavy gauge sheet material, such as heavy cardboard.
  • the requirement movement of the point representing abutment member 55 to the point representing switch 51 is considerably shorter than the distance between point 55' and point 51'.
  • the sensitivity of the device is the higher the closer levers 48 approach parallel positions.
  • FIG. 13 shows diagrammatically an arrangement in which the previously described coacting pairs of rollers are replaced by capacitative detecting means.
  • electrodes 108 in the form of metal plates are inserted in a feed table 4a.
  • Each of the plates coacts with a second plate electrode 110 and 111 respectively.
  • the electrodes 108, 110 and 109, 111 are so spaced from each other that the sheets to be fed can freely pass between the .electrodes.
  • the two pairs of electrodes each con- 1 stitute a capacitor, the capacitance value of which is controlled by the total thickness of the sheet material passing therebetween.
  • the distance between the two capacitors is again equal to the distance A representing the spacing between adjacent sheets.
  • the sheet material constitutes a dielectric for the capacitors and hence the capacitance values will accurately reflect the number of superimposed sheets or the absence of sheets.
  • the two capacitance values obtained with the arrangement according to FIG. 13 are compared in suitable comparing means such as the four-arm bridge shown in FIG. 14.
  • the two capacitors are included in two arms of the bridge and each of the two other arms includes an adjustable capacitor 112 and 113 respectively.
  • the bridge is connected to a high frequency source of current 114, or any other suitable source of current and is adjusted by means of capacitors 112 and 113 so that the bridge is in balance when, as desired, the same number of sheets passes capacitors 108, 110 and 109, 111. However, if one of the capacitors detects a different number of sheets, the bridge is in imbalance and a voltage is now present at points 115, 116. This voltage is fed to an amplifier 118 connected to a source of current 117 and controlling a solenoid 119 which constitutes part of the control circuit as described in connection with FIGS. 5 and 9.
  • FIG. 15 uses a mechanical-electrical converter for obtaining control signals corresponding to the spacing between rollers 120 and 121 which, as previously described, is controlled by the thickness of the sheetrnaterial passing between the rollers.
  • the converter comprises a suitably connected exciter coil 122 in which a core of varying cross sectional outline, such as a conical core 123, is lengthwise displaceable.
  • a core of varying cross sectional outline such as a conical core 123
  • the core is coupled to an arm 125 pivotal at one end about a stationary pivot 124 and supporting at the other end a roller 121.
  • the counter roller 120 is suitably secured to a feed table 40 for instance by means of a bracket 126.
  • the general function of the device according to FIG. 15 is evident from FIGS. 1, 6, and 11.
  • a converter such as shown in FIG. should be provided as previously described for two pairs of rollers spaced at the distance A representing the overlap spacing between adjacent sheets.
  • the signals obtained from the two converters may be compared in a bridge circuit of the kind shown in FIG. 14, though of course designed for signals of the kind delivered by an inductive converter.
  • FIG. 16 shows a graph in which the abscissa X indicates the gauge of the sheet material, such as paper, and the ordinate Y the induction of coil 120.
  • roller 21 is lifted higher by a heavy gauge than by a light gauge whereby the peripherally smaller portion of core 123 enters more deeply into coil 122.
  • FIG. 16 shows that the change in the induction of coil 122 is less for a heavy gauge in response to a given change in the total thickness of the sheet material than for a light gauge.
  • the bridge comparing the signals obtained from the two converters will operate a control solenoid, such as solenoid 119, when heavy gauge sheets are used, at larger departures from a reference value than when light gauge sheets are used.
  • a detecting device for detecting the absence of sheetsand the presence of doubled-up sheets fed in the form of a train of overlapping sheets to a printing press
  • said detecting device comprising two detectors disposed spaced apart in the direction of the sheet travel, each of said detectors being arranged to detect the thickness of the sheet material passing the same and to generate a sig I control signal in response to a differential above a pre:
  • each of said detectors comprises a pair of coacting rollers for feeding said sheets therebetween, one of said rollers of each pair being yieldably supported, the spacings between the rotational axes of each of said pairs of rollers being indicative of the total thickness of the sheet mate rial passing between the rollers of the respective pair.
  • each of said detectors comprises a pair of coacting rollers for feeding said sheets therebetween, one of said rollers being yieldably supported, the spacings between the rotational axes of each of said pairs of rollers being indicative of the total thickness of the sheet material passing between the rollers of the respective pair, and comprising lifting means coacting with one of said yieldable rollers to lift the same intermittently for opening the respective detector to provide a free run-in for the leading edges of the sheets.
  • a detecting device comprising adjustment means responsive to the gauge of the fed sheets and controlling said comparing means to produce a control signal in response to a differential which is greater for sheet gauges above a predeterminedvalue than for sheet, gauges below said predetermined value.
  • one of said detectors comprises two probes for detecting the thickness of sheet material at two points spaced apart in the direction of the sheet travel, the spacing of one of said probes from the other detector being larger than the overlap spacing of the sheets in said train of sheets by a predetermined amount and the spacing of the other of said probes from said other detector being smaller than said overlap spacing by approximately the same amount, the two probes producing a signal for comparison with the signal produced by said other detector when both probes detect substantially the same thickness of sheet material passing the probes.
  • eachof said detectors comprises a pair of coacting rollers for feeding said sheets therebetween, one of the rollers being yieldably supported, the spacings between the rotational axes of each pair of rollers being indicative of the total thickness of the sheet material passing between the rollers of the respective pair, and comprising two mechanicalelectrical converts having a non-linear characteristic, each of said converters being coupled with the yieldable roller of one pair for generating an output signal corresponding to the spacing of the rollers of the respective pair, said output signals being fed to said comparing means.
  • each of said converters is an inductive converter including an exciter coil and a tapered cone lengthwise slidable in said coil.
  • each of said detectors comprises a capacitance means having two spaced apart electrodes for passing the sheets therebetween, the thickness of the passing sheet material controlling the capacitance value of the respective capacitance means, and wherein said comparing means comprise -a bridge circuit including said capacitance means for generating a control signal in response to a predetermined imbalance'of said bridge circuit.
  • a detecting device for detecting the absence of sheets and the presence of doubled-up sheets fed in the form of a train of overlapping sheets to a printing press
  • said detecting device comprising two detectors disposed spaced apart in the direction of the sheet travel, each of said detectors being arranged to detect the thickness of the sheet material passing the same and to generate a signal corresponding to the detected thickness, the spacing between the two detectors being equal to an integral multiple of the overlap spacing of the sheets within said train of sheets, comparing means comparing said signals and producing an electric control signal in response to a diiferential above a predetermined value between said compared signals and control circuit means activated by said control signal.
  • a detecting device for detecting the absence of sheets and the presence of doubled-up sheets fed in the form of a train of overlapping sheets to a printing press
  • said detecting device comprising two detectors disposed spaced apart in the direction of the sheet travel, each of said detectors being arranged to detect the thickness of the sheet material passing the same, the spacing between the two detectors being equal to the overlap spacing of the sheets within said train of sheets, each of said detectors including a pair of coacting rollers for feeding sheets therebetween, one of said rollers of each pair being yieldably supported, the spacings between the rotational axes of each of said pairs of rollers being indicative of the total thickness of the sheet material passing between the rollers of the respective pair and a linkage coupling the two yieldable rollers of said detectors, said linkage being displaceable in response to a differential in the positions of the two yield-able rollers in reference to the respective other roller of each pair, a control circuit means, and switch means operated in response to a positional differential above a predetermined value, said
  • a detecting device comprising a pivotal arm coupled to one of said yieldable rollers, the angular position of said arm being controlled by the position of said yieldable roller in reference to the other roller of the pair, and a rod coupled to the other yieldable roller and crossing said arm at an angle, said rod being lengthwise displaceable in reference to said arm according to the position of said other yieldable roller in reference to the respective other roller, and wherein said switch means comprise two switches disposed on said rod on opposite sides of said arm, displacement of the arm and the rod in reference to each other above a predetermined value operating either one of said switches depending upon the direction of displacement of the arm and the rod in reference to each other.
  • a detecting device for detecting the absence of sheets and the presence of doubled-up sheets fed in the form of a train of overlapping sheets to a printing press
  • said detecting device comprising two detectors disposed spaced apart in the direction of the sheet travel, each of said detectors being arranged to detect the thickness of the sheet material passing the same, the spacing between the two detectors being equal to the overlap spacing of the sheets within said train of sheets, each of said detectors including a pair of coacting rollers for feeding said sheets therebetween, one of said rollers of each pair being yieldably supported, the spacings between the rotational axes of each of said pairs of rollers being indicative of the total thickness of the sheet material passing between the rollers of the respective pair, a bell crank lever pivotal about a rotational axis, one arm of said lever mounting the yieldable roller of one of said detectors and the other arm mounting two lugs disposed at different distances from the rotational axis of said lever, the angular position of said lever being controlled by the spacing between the two rollers of
  • said detecting device for detecting the absence of sheets and the presence of doubled-up sheets fed in the form of a train of overlapping sheets to a printing press, said detecting device comprising two detectors disposed spaced apart in the direction of the sheet travel, each of said detectors being arranged to detect the thickness of the sheet material passing the same, the spacing between the two detectors being equal to the overlap spacing of the sheets within said train of sheets, one of said detectors including two probes for detecting the thickness of the sheet material at two points spaced apart in the direction of the sheet travel, the spacing of one of said probes from the other detector being larger than the overlap spacing of the sheets in said train of sheets by 'a predetermined amount and the spacing of the other of said probes from said other detector being smaller than said overlap spacing by approximately the same amount, the two probes producing a signal for comparison with a signal produced by said other detector when both probes detect substantially the same thickness of sheet material passing the probes, each of said probes including a pair of coacting rollers for feeding sheets therebetween, one of said
  • a detecting device for detecting the absence of sheets and the presence of doubled-up sheets fed in the form of a train of overlapping sheets to a printing press
  • said detecting device comprising two detectors disposed spaced apart in the direction of the sheet travel, each of said detectors being arranged to detect the thickness of the sheet material passing the same, the spacing between the two detectors being equal to the overlap spacing of the sheets within said train of sheets, each of said detectors including a pair of coacting rollers for feeding said sheets therebetween, one of said rollers of each pair being yieldably supported, the spacings between the rotational axis of each pair of rollers being indicative of the total thickness of the sheet material passing between rollers of the respective pair, a pair of pivotally mounted levers, one end of each of said levers mounting one of the yieldable rollers, the angular positions of said levers being controlled by the spacings between the yieldable References Cited by the Examiner rollers and the respective other rollers, said levers cross UNITED STATES PATENTS mg each other,

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DER37758A DE1204243B (de) 1964-04-23 1964-04-23 Bogen-Abfuehlvorrichtung bei Bogen-Anlegern

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US3371331A (en) * 1965-07-12 1968-02-27 Mailmen Inc Detection system for sheets of paper or the like
US3495822A (en) * 1966-10-17 1970-02-17 Dennison Mfg Co Photocopier control apparatus
US3532338A (en) * 1968-04-12 1970-10-06 Ibm Document handling device
US3744047A (en) * 1971-09-16 1973-07-03 Xerox Corp Superposed sheet detection
US3860234A (en) * 1971-01-04 1975-01-14 Standard Register Co Apparatus for control of travel of sheets
US4030607A (en) * 1974-04-30 1977-06-21 Nippon Electric Co., Ltd. Flat-article separating apparatus for an automatic mail handling system and the like
US4283185A (en) * 1979-10-09 1981-08-11 Molins Machine Company, Inc. Stacker conveyor run separation control
US4355799A (en) * 1980-05-05 1982-10-26 Bartizal Jr John J Sheet stream sensing and control device
US4879513A (en) * 1987-02-19 1989-11-07 Heidelberger Druckmaschinen Ag Device for measuring paper or the like lying on a support
US4936568A (en) * 1989-02-08 1990-06-26 Pitney Bowes Inc. Control circuit for single revolution means
EP0604201A1 (de) * 1992-12-24 1994-06-29 Pitney Bowes Inc. Universelle Führungsvorrichtung für eine Kuvertiermaschine
US5341408A (en) * 1991-07-26 1994-08-23 Brandt, Inc. Control system for currenty counter
US5356130A (en) * 1992-02-19 1994-10-18 Ferag Ag Method and apparatus for detecting faults in a stream of overlapping products
EP1148315A2 (de) * 2000-04-20 2001-10-24 Hewlett-Packard Company Kapazitive Dickenmessung
CN109607279A (zh) * 2019-01-04 2019-04-12 浙江工业职业技术学院 一种薄膜长度分段控制装置及其加工工艺

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DE1238492B (de) * 1966-02-14 1967-04-13 R & M Leuze Vorrichtung zum Abstellen einer bogenverarbeitenden Maschine beim Auftreten von Doppelbogen oder Fehlstellen
DE3563876D1 (en) * 1985-04-19 1988-08-25 Gao Ges Automation Org Thickness measurement device for foil material
DE3801429C2 (de) * 1988-01-20 1998-05-20 Siemens Ag Druckvorrichtung mit verstellbarer Gegendruckrolle
EP0479717B1 (de) * 1990-10-05 1995-03-22 Ferag AG Dickenmessung an Druckprodukten in einem Schuppenstrom

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US2680614A (en) * 1950-07-29 1954-06-08 Jr George A Gibson Article feeder
US2940754A (en) * 1957-03-28 1960-06-14 Minnesota Mining & Mfg Apparatus for mounting films and other inserts in cards

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US2940754A (en) * 1957-03-28 1960-06-14 Minnesota Mining & Mfg Apparatus for mounting films and other inserts in cards

Cited By (17)

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Publication number Priority date Publication date Assignee Title
US3371331A (en) * 1965-07-12 1968-02-27 Mailmen Inc Detection system for sheets of paper or the like
US3354273A (en) * 1965-09-24 1967-11-21 Rca Corp Two card detector
US3495822A (en) * 1966-10-17 1970-02-17 Dennison Mfg Co Photocopier control apparatus
US3532338A (en) * 1968-04-12 1970-10-06 Ibm Document handling device
US3860234A (en) * 1971-01-04 1975-01-14 Standard Register Co Apparatus for control of travel of sheets
US3744047A (en) * 1971-09-16 1973-07-03 Xerox Corp Superposed sheet detection
US4030607A (en) * 1974-04-30 1977-06-21 Nippon Electric Co., Ltd. Flat-article separating apparatus for an automatic mail handling system and the like
US4283185A (en) * 1979-10-09 1981-08-11 Molins Machine Company, Inc. Stacker conveyor run separation control
US4355799A (en) * 1980-05-05 1982-10-26 Bartizal Jr John J Sheet stream sensing and control device
US4879513A (en) * 1987-02-19 1989-11-07 Heidelberger Druckmaschinen Ag Device for measuring paper or the like lying on a support
US4936568A (en) * 1989-02-08 1990-06-26 Pitney Bowes Inc. Control circuit for single revolution means
US5341408A (en) * 1991-07-26 1994-08-23 Brandt, Inc. Control system for currenty counter
US5356130A (en) * 1992-02-19 1994-10-18 Ferag Ag Method and apparatus for detecting faults in a stream of overlapping products
EP0604201A1 (de) * 1992-12-24 1994-06-29 Pitney Bowes Inc. Universelle Führungsvorrichtung für eine Kuvertiermaschine
EP1148315A2 (de) * 2000-04-20 2001-10-24 Hewlett-Packard Company Kapazitive Dickenmessung
EP1148315A3 (de) * 2000-04-20 2003-09-10 Hewlett-Packard Company Kapazitive Dickenmessung
CN109607279A (zh) * 2019-01-04 2019-04-12 浙江工业职业技术学院 一种薄膜长度分段控制装置及其加工工艺

Also Published As

Publication number Publication date
SE318895B (de) 1969-12-22
GB1094863A (en) 1967-12-13
CH434306A (de) 1967-04-30
DE1204243B (de) 1965-11-04

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