4246 4250.output

* GB784653 (A)

Description: GB784653 (A) ? 1957-10-16

Improvements connected with printing presses

Description of GB784653 (A)

PATENT SPECIFICATION 784,653 Date of filing Complete Specification: June 1, 1956. No 19360/55. Complete Specification Published: Oct 16, 1957. Index at acceptance:-Class 100 ( 2), C( 2 83 A: 13 G: 46 E: 46 G). International Classification:-B 41 f. COMPLETE SPECIFICATION Improvements Connected with Printing Presses I, LEONARD HARDING, of FARLEY ENGINEERING Wo R Ks, Gladstone Road, East Croydon, Surrey, of British Nationality, do hereby declare the invention, for which I S pray that a patent may be granted to me, and the method by which it is to be performed, to be particularly described in and by the following statement:- This invention relates to printing machines and has for its object to provide an improved construction applicable to a printer's, proofing cylinder press by which the travelling rubber impression cylinder in proofing machines can be raised or lowered to vary the impression on the type. In accordance with the invention the travelling rubber impression cylinder surrounds a metal tube which is bushed at each end and traversed by a shaft, the ends of which are reduced in diameter and eccentric to that part of the shaft about which the cylinder revolves The shafts ends constitute journals for rotatable driving discs or rollers which may be fitted with ball bearings and are adapted to run on bearers on the press These discs are each connected for rotation with the cylinder through the medium of a plate having a large central aperture fitting over the reduced portion of the shaft and having angularly spaced radial slots engageable by pins extending from the end bushes and from the discs respectively. The movement of the rubber cylinder is thus synchronized with the

discs although one is off centre in relation to the others. The metal discs rest in side bearers in the machine while the ends of the shaft are supported in end frames. By turning the shaft the cylinder can thus be raised or lowered to vary the impression of the types. The invention is illustrated in the accompanying drawing in which Fig 1 is a perspective view of a proofing cylinder pressi (Price 3 s 6 d J fitted with the improvement of the invention 45 Fig 2 is an elevation partly in section showing the improved means by which the rubber cylinder can be raised or lowered while Fig. 3 is a section on the line 3 x-3 x of Fig 2, illustrating the drive from the discs to the 5 O rubber cylinder. Referring to the drawing, the usual rubber impression cylinder 10 surrounds a metal tube 11 which is provided with a bush 12 at each end and is traversed by a shaft 13 the 55 ends 14 of which are reduced in diameter and eccentric to that part of the shaft 13 about which the bushes 12 with the tube 11 and cylinder 10 revolve The shaft ends 14 constitute journals for rotatable discs or the like 60 which are shown as mounted through the medium of ball bearings 16 on the shaft ends 14 and connected for rotation with the cylinder 10 through the medium of a plate 17 having a large central aperture 18 fitting 65 over the reduced portion 14 of a shaft 13 and having angularly spaced radial slots 19 engageable by pins 20, 21 extending respectively from bush 12 and from the disc 15. The movement of the rubber cylinder 10 is 70 thus synchronized with the discs 15 although one is off centre with respect to the other. The metal discs 15 rest on and are adapted to travel over side bearers 22 on the machine while the shaft 14 is supported in 75 end frames 23 which engage the bearers through the medium of rollers 24 and ensure that the discs 15 are always in contact with the bearers 22. A hand wheel 25 secured to the shaft end 80 permits of turning the shaft and thus raising or lowering the cylinder 10 to vary the impression upon the type The hand wheel is suitably calibrated on its periphery adjacent a plate 26 having a reference mark pro 85 viding a means of facilitating the setting of the level of the rubber cylinder.

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* GB784654 (A)

Description: GB784654 (A) ? 1957-10-16

Apparatus for detecting gaws in clothbeing woven


PAT'EN'r SPECIFICATION Inventor: WILLIAM HAMISH TOUGH Date of filing Complete Specification June 29, 1956. Application Date July 14, 1955. Complete Specification Published Oct, 16, 1957. Index at Acceptance: -Class 142 ( 2), E 4 G. International Classification: -D 03 d. COMPLETE SPECIFICATION Apparatus; for Detecting Gaws in Cloth being Woven We, SCOTT & FYFE LIMITED, a British company, of Scotscraig Linen Works, Tayport, Fife, Scotland, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: - This invention relates to an apparatus for detecting gaws, i e missed weft threads, in cloth while the cloth is being woven. An apparatus according to the invention incorporates a supporting plate attachable to a loom frame and carrying two electrical contacts spring-urged into engagement, and a feeler attached to one of the contacts and adapted to bear against the surface of a web of cloth being woven in the loom. The contact other than that associated with the feeler may be a fixed contact, and may consist of a pin projecting from the supporting plate, and the other contact may be integral with the feeler and may be formed from a length of wire pivoted at one end to the supporting plate, the other end being engageable with one of the surfaces of the cloth. The length of wire constituting the movable contact may be adjustably attached to a sleeve encircling a pivot fastened to the supporting plate. A practical embodiment of the invention is illustrated in the

accompanying drawings in which Fig 1 is a side elevation of an apparatus and Fig 2 is a plan view of the apparatus. In the drawings'1 denotes a supporting plate attachable to the breast rail 2 of a loom by bolts 3 insulated by insulation 4 from the plate 1 5 denotes a fixed electrical contact pin carried by the plate 1 and insulated from the plate 1 by insulating washers 6 7 denotes a feeler penetrating the head of a clamping screw 8 supported by a bracket 9 mounted on a pivot pin 10 fixed to the plate 1, the bracket 9 being urged by a spring 11 to swing towards the position in which the feeler 7 is against the pin 5, the portion 12 of the feeler 7 constituting a second contact 13 and 14 lPrice 3 s 6 d l 0 int c 1 " O denote terminals connectible to means for stopping the driving mechanism of the loom. denotes a web of cloth. In practice, the terminals 13 and 14 are 50 electrically connected in the circuit of a relay adapted to control the stop mechanism of the loom When cloth is being woven normally the feeler 7 presses against one of the surfaces of the cloth and is held, in opposition to the 55 spring 11, in the position in which the contacts 12 and 5 are open If a gaw should form in the cloth, when the gaw comes opposite the feeler 7 the feeler is moved by the spring 11 through the gap left by the missing weft 60 thread, the contacts 12 and 15 close and the stop mechanism of the loom is operated. The position of the feeler may be adjusted by loosening the clamping screw 8 and sliding the feeler through the head of the screw 8 65 to the desired position, after which the clamping screw is tightened to clamp the feeler 7 against the bracket 9.


* GB784655 (A)

Description: GB784655 (A) ? 1957-10-16

Three footed arm-chair built with tubulous elements and covering clothcombined with a table


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PATENT SPECIFICATION Date of Application and filing Complete Specification: Aug 3, 1955. Application made in France on Aug 25, 1954. 784,655 No 22247/55. Application made in France on April 28, 1955. Complete Specification Published: Octo 16, 1957. index at acceptanoe:-Classes 52 ( 2), J( 1 A 1:21 E), W( 1 A:2 J); and 52 ( 3), H( 1 M:3 E:14: 17 B:17 C:21), O ( 5:9:18:22). international Classification:-A 47 b, o. COMPLETE SPECIFICATION Three Footed Arm-chair built with Tubulous Elements and covering Cloth combined with a Table I, MARIANO MARCOS, Nouvelle Cite Aubin (Aveyron), France, of French Nationality, do hereby declare the invention, for which I pray that a patent may be granted to me, and the method by which it is to be performed, to be particularly described in and by the following statement:- This invention concerns a three footed arm-chair made of detachable tubular elements, and of a covering cloth. The three footed frame has been designed to provide a great flexibility owing to the flexion of the elements strained by the weight of the body, this weight being transmitted uniformly by the cloth Besides, this cloth is intended to maintain the elements in assembled condition which secures the solidity of the whole.

In the accompanying drawings, Figs 1, 2, 3, show the frame of the arm-chair with the table, respectively in front, profile and plan; Fig 4 shows a perspective of the armchair with the table and cloth; Fig 5 shows all the constituent parts of the frame made of one element 1, two elements 2, two elements 3, two elements 4, one element 5, one element 6, one element 7, one element 8, one element 9. The four latter make up the table All elements are tubular, except for the two latter which, made of sheet iron, wood, or any other convenient material, constitute the plain surface of the table. All the tubular elements fit into one another as shown in detail on the drawings. The element 6, support of the table slides along the element 3, and is positioned by an ordinary locking screw or by a pin going through the two elements. The plain surface of the table (elements 8 and 9) is fastened to element 7 by two collars and a locking screw or a pin So, the plain surface can be canted to any angle, as the arrows of Fig3 show it 45 The covering cloth, of suitable shape according to Fig 4 is hanging from the tubular frame by means of three pouches, the greater of them, for the back is hanging from element 1, and the smaller two, for the 50 fore part, are hanging from elements 4. Moreover, this cloth has been designed to be used as a sort of bag easy to be carried when containing the different elements of the chair taken to pieces 55 All the elements of the frame can be secured together in order to constitute a rigid arm-chair.


* GB784656 (A)

Description: GB784656 (A) ? 1957-10-16

Improvements in or relating to control means for electric current converters


PATENT SPECIFICATION Date of Application and filing Complete Specification: Aug 9, 1955 N Application made in Germany on Aug 9, 1954. Application made in Germany on Nov 27, 1954. o\S w/, Complete Specification Published: Oct 16, 1957. Index at acceptance:-Class 38 ( 2), Fo 10. International Classification:-H 02 m. COMPLETE SPECIFICATION Improvements in or relating to Control Means for Electric Current Converters We, SIEMIENXS-SCHUCKEITWER Kn E Ai TIENGESELLSCHAFT a German Company, of 1, Berlin-Siemensstadt and Erlangen, Germany, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:This invention relates to electric current converters and control apparatus therefor. The invention is concerned with arrangements for feeding the control electrode which controls the passage of current through the associated discharge path of a current converter having a liquid metal cathode, the converter being of the kind wherein this control is effected either by means of a grid or by means of an ignition pin which constantly dips into the liquid cathode of the discharge vessel and brings about a further ignition in the discharge path during each cycle of the alternating current with which the discharge vessel is fed Thus the term "control electrode" as used hereinafter is to be understood to mean a grid or an ignition pin as indicated above. For the regulation of poly phase mereury are eurrent converters, the ignition voltage with which each control electrode is supplied for rendering the associated discharge path conductive at a predetermined instant in the course of a cycle of the alternating current bus-bar voltage must be displaceable by a maximum of about 150 electrical degrees with respect to that bus-bar voltage. Since the control sets hitherto employed for such eurrent converters are sufficient only for a maximum displacement of these voltages, and consequently of the point of initiation of the current conduction in the discharge path, by about 100 to 12 O , it has been necessary to provide in addition lPrice 3/61 784,656 ao 22989/55. phase bridges for widening this range of adjustment Such a phase bridge, however, not only increases the outlay necessary for the control arrangement of the current converter, but it also has other

disadvan 50 tages such for example, as sensitivity to mains voltage variations, and in addition a time constant whiceh is undesirably large for the regulation. According to the present invention there 55 is provided in combination with an electric current coverter of the kind having dis charge paths controlled by respective control electrodes, apparatus for controlling the instants of commencement of the dis-60 charzes over a wide control range, if desired from rectifier operation to inverter operation wherein each respective control electrode is connected to be fed from two inductive members, both transformers or 65 both chokes, which are supplied from the alternating-current bus-bars with mutually phase-displaced operating currents or voltages, there being first means for imparting to the two inductive members a com 70 monlv variable direct current control premagnetisation and there being second means for imparting to the two inductive members constant direct current control premagnetisations which can be pre-set 75 independently, whereby the feed of each control electrode can be controlled in such manner that, as a result of the particular settings of the values of the separately adjustable control premagnetisations, each 80 respective inductive members supplies a control voltage for the control electrode during a particular allotted portion of the total control range of the current converter 85 For a better understanding of the invention and to show how the same may he carried into effect, reference will now be made to the accompanying drawings in which: 9 784656 Figs 1 to 3 are circuit diagrams showing three different methods of controlling current converters. Fig 4 is a circuit diagram showing part of the circuit illustrated in Fig 3; and Figs 5 to 7 show relationships between voltage and timne for the control circuit illustrated in Figs 3 and 4. Referring now to the drawings, in Fig. 1, which for the sake of clarity shows in detail the circuit associated with only one grid of the converter, RST and O are conneeting leads from a three-phase current supply system Primary wvindings 7 to 12 of impulse transformers fed from the supply system are provided with filter elements in the form of chokes 1 to 3 and condensers 4 to 6 for filtering the supply voltage to produce, at the wlindings 7 to 12, a pure sinusoidal wave form Saturable chokes 13 to 15 are also provided in order to produce a current of approximately triangular wave form in these windings Two impulse transformers are provided for each arid of the converter, the secondary windings of the impulse transformers being designated by 16 to 21. Additional windings 22 to 27 are fed with direct current in order to provide constant premagnetisation of the impulse transformers Of these additional windings, the two windings corresponding to any particular

phase of the supply, for example 22 and 23, are joined in series and separately supplied Thus the value of this constant premagnetisation can be pre-set for each phase of the supply system independlently of the transformers of the other phases A variable direct current premagnetisation is effected by means of the windings 28 to 33 in accordance with an adjustment made to give the required degree of phase-angle control of the current converter The windings 28 to 33 are all connected in series so that the currents in them are commonly variable, i e, variable in unison The secondary windings 16 and 18 of two impulse transformers, the primary windings of which are fed with currents having a phase difference between them, are shown connected in series for supplying one grid of the current converter Reetifiers 34, 35 are connected one in parallel with each of the windings 16 and 18 These reetifiers serve to short-circuit the associated windings during the negative half-cycles of the voltages produced in the windings In order to limit the current flowing through the rectifiers in these half-cycles, limiter resistances 36 and 37 respectively are connected in series with the windings 16 and 15. The necessary constant negative voltage for the grid is derived from a three-phase bridge-connected rectifier 51, the rectifier being supplied from a separate source not shown in the drawing This constant negative voltage is applied across a resistor and is thus in series with the voltage derived from the windings 16 and 18 The 70 resultant voltage is used to supply the grid of the current converter, the grid control voltage U being set utip across the terminals:3,8 and 39 A filtering condenser 52 is connected across the bridoe-colnmeeted 75 rectifier 51 As a result of the variable premagnetisation of the impulse transformers in eombination with the constant premagnetisation the impulse transformer having the windings 7 and 16 may 80 be made to supply the necessary ignition voltage which is here in the folrm of a voltage impulse during a first range of the cycle, the instant at which this voltage appears being adjustable by means of the 85 variable premagnetisation in accordance with the desired deree Of phase-anile control Meanwhile the impulse transformer having the windings 9 and 15 is initially prevented from supplying positive 90 voltage impulses This latter impulse transformer cannot supply negative voltage impulses to the grid du'ing this period since any such impulses produced would be short-circuited by the rectifier 35 95 From a certain instant, according to the degree of constant premagnetisation employed, the second impulse transformer also becomes effective so that both impulse transformers are simultaneously operative 100 in a period of overlapping action Then the first impulse transformer becomes inoperative and for a time only the second transformer supplies the control voltage impulses for the control grid

of the cur 105 rent converter. The circuit described above may he employed when the voltages of the impulse transformers, when connected to a threephase supply system, have a phase-dis 110 placement of 60 or 120 %. A control circuit comprising two chokes in series with rectifiers is illustrated in Fig 2 in which, for the sake of simplicity, the method of supply of the control voltage 115 impulses to one grid only is illustrated. Two cholkes 102 and 103 are connected in series with rectifiers 104, 105, respectively, and are fed from a three-phase supply system RST through a transformer 101 120 with output voltages phase-displaeed in relation to one another hby 60 eleotrical degrees There is provided for the two chores 102 103) a common series resistance 106, across which the v-oltaae wbich is used 125 to control the arid of the,turrent converter apuears Each of the,qokes is constantly prem aanetised with direct c urrent thlirouh the separate windlings 107 and 108 respectively A variable direct current premag 130 784,656 netisation is provided for the two chokes by means of windings 109 and 110 which are connected in series so that the currents in them are variable in unison By the adjustment of this variable premagnetisation the instant of occurrence of the grid control impulse can be varied. The constant premagnetisation of each of the two chokes 102, 103 is made such that one of them suddenly becomes magnetically saturated during the positive half-cycvle of the voltage with which it is fed, while at the same time the other choke remains unsaturated Both chokes partieipate simultaneously in the supply of this current in a period of overlapping action. Resistances 111 and 112 may be employed to adapt the blocking resistances of the two rectifiers 104 and 105 to one another to ensure satisfactory operation of the control circuit. A control set operating as described with reference to Fig 2 has the feature that the ignition impulse may be produced substantially until the instant in the cycle when the alternating v-oltage feeding the control set associated with the relevant grid passes through zero It has been found that such a method of operation of the control set may sometimes give rise to certain disadvantages, such as exposure of the current converter to the danger of back-firing effects. Fig' 3 shows a control circuit developed with a view to overcoming these disadvantages In Fig 3, apart from the transformer 201 for feeding the control set, only the circuit for feeding one of the control grids of the current converter is shown, in order to simplify the illustration Two chokes 202 and 203 are each effective for the supply of the ignition impulse over a part of the whole range over which the associated grid of the eonverter is to be controlled

Reetifiers 204 and 205 are conneeted in series with the chokes 202 and 203, respectively Two resistances 206, 207 are connected in series with each other and with the chokes 202, 203, and an additional choke 208 is connected in series with a rectifier 209 The cores of the chokes 202, 203 and 208 are pre-magnetized by a variable control current passing through windings 202 a, 203 a and 208 a respectively which are connected in series so that the currents in them are variable in unison. This has the effect of determining the instant of the initiation of the ignition of the current converter In addition, the instant of operation may be adjusted at the individual chokes by means of the windings 202 b, 203 b and 208 h respectively, which are individually fed with direct current The ignition voltage is fed to the grid-cathode path of the current converter through conductors 210 and 211. For further explanation of the action of the circuit shown in Fig 3 reference will now be made to Figs 4 to 6. In Fig 4, the parts already shown in 70 Fig 3 are again designated by the same reference numerals Assuming in Fig 3 that the secondary winding 201 a of the transformer 201 has positive polarity at its lower end during the half-cycle considered, 75 there may flow through the rectifier 205, the choke 203 and the resistance 206, a current which sets up a corresponding voltage across the resistance 206 Similarly a voltage may be set up across the resis 80 tance 207 by a current which flows through it, the choke 208 and the rectifier 209 The currents through both resistances 206 and 207 flow back to the other end of the secondary winding 201 a of the transformer 85 201 Whether a substantial current flows through these resistances 206 and 207 respectively is dependent upon the instantaneous state of magnetisation of the chokes 203 and 208 respectively With 90 equal phase-angle control of the chokes 203 and 208, the two chokes will remain unsaturated during the periods indicated by the areas F, and F 2 in the voltage-time diagram of Fig 5 when the voltages U 3 95 and U 18 respectively are set up across the chokes 203 and 208 During this interval of time the voltages across the resistances 206 and 207 are practically zero, since practically the whole of the available volt 100 age appears across the chokes 203 and 208 which, being unsaturated, have a high impedance When the two chokes become saturated, substantially the whole of the secondary voltage of the transformer 201 105 is present as voltage U 6 across the resistance 206, on the one hand, and as voltage U 7 across the resistance 207, on the other hand It will be apparent from this that the resultant voltage appearing across the 110 conductors 210, 211, that is the difference U 6 U 7 between these voltages is zero.

However, if the two chokes 203 and 208 are assigned different degrees of phase angle control by suitable adjustment of the cor 115 responding direct-current premagnetisation, one of the two chokes, for example the choke 203 according to Fig 6, remains unsaturated only during the period to corresponding to the area F',, while the other 120 choke remains unsaturated during the period t 2 corresponding to the area F'2. Hence a voltage of value U 6 is set up across the resistance 206 before a voltage U 7 of substantial value appears across the 125 resistance 207 Thus, a voltage indicated by -Fo/J is present at the conductors 210 and 211 from the instant t, until the instant t 2 The two voltages UG and U, are again equal from the instant t 2, so that the 130 784,656 voltage at the conductors 210 and 211 again becomes zero The desirable effect is thus obtained that the period of time during which the ignition voltage is eftective is ended before the alternating voltage supply of the grid control set reaches its next zero point. Two windings of the feeding transformer 201 havinlg v-oltages which are phase-displaced with respect to one another by 60 electrical degrees are employed to feed two circuits, that of the choke 202 and the rectifier 204 and that of the choke 203 and the rectifier 205. The operation of the complete circuit shown in Fig 3 will now be explained In accordance with the operation described with reference to Fig 4 there would be required for cooperation with each of the chokes 202 and 203 a choke similar to the choke 208 but it is actually unnecessary to employ two of these chokes, one choke being sufficient The action of this choke 208 for the whole range controlled by the two chokes 202 and 203 will now be explained with reference to Fig 7 It will be assumed that the larest phase-angle control range to be dealt with extends from the instant t? until the instant t 4 This corresponds to the usual control range necessary to enable a current converter to he subjected to phase-angle control in operation both as a rectifier and as an inverter With a phase-angle control or ignition of the rectifier at the instant t:. a positive voltage would then be applied to the grid until the instant t, if the chokes 202 and 203 operated without the additional choke 208 Owing to the presence of the choke 208, this period of positive grid voltage is cut down for example to the time interval t 3-t,,, there being set up by the current passing through the choke 208 a voltage across the resistance 207 which varies with time as shown in the area Fs, being determined by the time interval from t,; to t 5 From the instant t, therefore, the voltages U, and U 7 cancel one another out at the resistances 206 and 207, so that from this instant the voltage between the c onduetors 210 and 211 is zero.

The phase-angle control of the three chokes 202 203 and 208 that is to say the instant at which they pass into the saturated state, is commonly varied for all the chokes by I variation of the current in the windings 1 202 a 203 a and 208 a For adjusting the i pnositions of the characteristic curves of the e ihree chokes, the currents in the three D windings 202 b, 203 b and 208 b may be in s dividually varied and by this variation the a time interval between the initiation of the r saturation of the chokes 202 and 203 and ec that of the choke 208 is determined The d arrangement of the choice 208 in series ' t, with the rectifier 209 is only one example of an arrang emelnt which mnust have the property of being capablle of completely eancelling out the voltage supplied b at least one of the chokes 202 and 203 so that 70 a zero grid voltage can be attained in the current converter. The invention is not limited to thie application to current con-erters where the simultaneous use of two rmuaiiietic arrange 75 ments each of wlhich is operative over only a part of a whole control ralnge is unavoidable It is also applicahle in cases where it is necessary to exercise control over a current converter over onlv a small 80 range which conld actually le dealt with by one marneti control arrangemet, bunt in which it is considered expedient in the interest of a desirable satisfactory operation of the current converter to end the 855 diration of the ignition voltage impulse before the supply volta-e again passes through zero. It is preferable to use for the chokes a core material having as far as possible a 90 rectangular mragnetisationll loop It is also preferable for the core material to have the quality that a small chan e in magnetomotive force ma produce a change from the unsaturated to the saturated condition 95 In applying the invention, it is possible to emiploy for all the control grids of a eurrent conv-erter control windinws which are influenced in commnon bv one regulating member 100


* GB784657 (A)

Description: GB784657 (A) ? 1957-10-16

Improvements in machines for applying liquids to travelling webs of material


PATENT SPECIFICATION 784,657 Date of Application and filing Complete Specification: Aug 18, 1955. No 23813/55. 1 R, g / Application made in Germany on Aug 30, 1954. (Patent of Addition to No 743,768 dated Dec 10, 1953) Complete Specification Published: Oct 16, 1957. Index at acceptance:-Class 140, K 35 D International Classification:-B 05. COMPLETE SPECIFICATION Improvements in Machines for Applying Liquids to Travelling Webs of Material We, JAGENBERG-WERKE A G, a German Company, of 107 Himmelgeisterstrasse, Dusseldorf, Germany, do hereby declare the invention, for which we pray that a patent may be granted to us and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to improvements in machines for applying liquids to travelling webs of material and it comprises an improvement in or modification of the machine described and claimed in Specification No. 743,768 hereinafter referred to as the Parent Specification, wherein the thickness of the coating is adjusted by a compressed air-jet directed against the surface of the web to be treated. The travelling web may consist for example of paper, card, cloth, foils of synthetic material or metals, and the applied materials may be paints, synthetic substances, impregnating media, gum or the like The latter are initially applied by suitable devices to the outer surface of the web The compressed air stream is directed against the outer surface of the web and hence any excess of coating material which may be taken up by the web is held back and the coating material remaining on the web is smoothed to produce a uniform and continuous film. As explained in the Parent Specification the cleaning of the gap-like air outlet opening extending generally over the whole width of the web to be treated, involves difficulties insofar as particles of coating media remain on the outlet opening of the nozzle which adversely

affects the treatment of the web of material, and the working procedure must be stopped for the purpose of removing them. To avoid this difficulty the Parent Specification comprises two or more blowing nozzles arranged in such a way that on the removal of one nozzle from the working position, its place is taken by the movement automatically of another nozzle from a resting position into its working position Thereby the possibility is secured of cleaning the soiled nozzle independently of the running 50 machine The particles of coating medium reaching the inside of the nozzle during the cleaning operation are removed on moving back the nozzle into the working position, according to a further embodiment of the 55 Parent Specification, by the fact that the nozzle is moved past apertures provided in the compressed air duct, so that the hardened coating medium is blown off by means of the momentary action of compressed air It 60 has now been shown that if an extended break in the working operation is to be avoided the time available for blowing out particles of coating medium remaining in the nozzle may not be sufficient to permit 65 complete cleaning of the nozzle. To avoid this disadvantage, the air nozzle assembly according to the present invention is so arranged that independent compressed air streams are produced and supplied both 70 for the nozzle in the working position as also for the nozzle located in the rest or cleaning position so that a fall of pressure of the supply of compressed air to the nozzle in the working position is avoided when the 75 cleaning air becomes operative By this pro vision the possibility is obtained of utilising the desired amount of air required for cleaning purposes without the danger arising that a reduction of the pressure, and thus the 80 amount of the air supplied to the main or spreader nozzle, shall be produced by the deflection of this cleaning air from the main stream. The arrangement can either be such that 85 independently operating compressed air sources are provided for the supply of air to the nozzle in the working position called the "spreader air" hereinafter and for the cleaning air or that only one compressed 90 784,657 air source is used for the spreader air and for the cleaning air and provision is made by which the compressed air employed for cleaning purposes is fed either to the nozzle located in the rest position or is led away so that the influences involving the constancy of the pressure of the spreader air are avoided. The nozzle body itself is provided with two independent air passages which are brought, according to the position of the nozzle body, automatically into communication with the supply for the spreader air or with the supply for the cleaning air, and in this case the arrangement is such that the feed of the spreader air and of the

cleaning air is effected through coaxially arranged pipeways disposed in the pivotal axis of the nozzle carrier. Hereinafter, one constructional embodiment of the invention is described and explained on the basis of the accompanying drawings wherein: Fig 1 shows a cross section through the nozzle body; Fig 2 shows a longitudinal section through the body. A flanged sleeve 2 is pivotally mounted on the stationary pipe 1 which serves for supplying the spreader air, and said sleeve is in turn connected to the head plate 4 of the nozzle body 3 and thus carries the nozzle body A preferably divided ring 5 is provided for supporting the flanged sleeve 2 in the machine frame, not shown, which ring is supported by its concave inner surfaces 6 on the convex outer surface 7 of the sleeve 2 The ring 5 is provided with a recess 8 for reducing the friction during pivoting of the nozzle body 3 as well as for receiving a lubricating medium A pin 9 firmly fitted in a bore of the stationary ring 5 engages a slot 10 of a holder ring 11 rigidly fixed to the pipe 1, and thus prevents co-rotation of the pipe 1 on rocking the nozzle body 3. The pipe 1 forming the pivoting shaft of the nozzle body 3 embodies in the region of the space closed by the flanged sleeve 2, a curved formation such that the outlet opening of the pipe 1 coincides with the inlet opening of the air passage 12 of the nozzle which is located in the working position In this position the air passage 13 of the other nozzle is in communication with the outlet 5,5 opening of the cleaning air pipe 14 which is arranged co-axially in the pipe 1 With the rotation of the nozzle body 3 the air passages 12 and 13 are brought into communication, according to the position of the nozzles, either with the spreader air feed or with 60 the cleaning air feed. The nozzle body 3 is formed in two halves as shown particularly in Fig 1 which are held together by screws 15 located towards the centre The air passages 12 and 13 are 65 provided with openings 16 through which the compressed air flows into the inside of the nozzle body Adjusting screws 18 are provided for regulating the width of the gap of the nozzle lips 17 70


4246 4250.output

Law