US2574633A - Bronzing machine - Google Patents

Description

Nov. 13, 1951 FALLER BRoNzING MACHINE Filed April 16, 1948 5 Sheets-Sheet 1 INVENTOR LEOPOLD FH LLER ....5 F /ln r//l ATTO NEY Nov. 13, 1951 L. FALLER BRoNzING MACHINE 5 Sheets-Sheet 2 Filed April 16, 1948 INVENTOR LEOPOLD FALLER ATTORNEY L. FALLER BRONZING MACHINE Nom. 13, 1951 5 Sheets-Sheet 3 Filed April 16, 1948 llllll m NVENTOR L EOPOLD FHLLER Bv MZ ATTORNEY Nov. 13, 1951 L. FALLER BRONZING MACHINE 5 Sheets-Sheet 4 Filed ADIil 16, 1948 @Q www.

QQ www QQ QQ G lNvr-:N-roR LEOPOLD FALLER BY i ATTORNEY Nov. 13, 1951 L.. FALLER BRoNzING MACHINE 5 Sheets-Sheet 5 Filed Avril 16, 1948 INVENTOR LEOPOLD FH LLER BYL ATTORNEY mmm Patented Nov. 13, 1951 UNITED STATES PATENT OFFICE BRONZING MACHINE Leopold Faller, Brooklyn, N. Y. Application April 16, 1948, Serial No. 21,478

21 Claims.

This invention relates to an applying machine, and more particularly to -a so-called bronzing machine for applying powders and especially metallic powders to the faces ofsheets.

An object of the present invention is to provide a bronzing machine, by means of which a substantial saving in the metallic powder to be used for coating sheets or the like can be obtained.

A further object of the present invention is to provide a bronzing machine, by means of which powder coated sheets of high quality may be obtained.

Another object of the present invention is to provide a bronzing machine, wherein the burnishing surfaces of the burnishers may be readily kept dry or at such a low humidity, that highly polished surfaces may be obtained and that the burnishers do not smear powder onto such parts of the sheets which shall not be coated with the powder.

A further object of the present invention is provide a bronzing machine, wherein the dusting bands Varranged for removing excess metallic powder from the sheets may be readily adjusted to the thickness and size of the sheets passing through the machine.

With the above and other objects of the invention in view, the invention consists in the novel construction, arrangement and combination of various devices, elements and parts, as

set forth in the claims hereof, certain embodiments of the same being described in the specification and being illustrated in the accompanying drawings forming part of this speciiication, wherein:

Fig. 1 is a fragmentary vertical sectional view of a bronzing machine according to the invention, said section being taken along line I--I shown in Fig. 2, and a portion of the front wall of the machine being shown in -an elevational view,

Fig. 2 is a sectional view taken on line 2--2 of Fig. 1,

Fig. 3 is a sectional view taken on line 3--3 of Fig. 1,

" Fig. 4 is a fragmentary sectional view taken on line 4-4 of Fig. 3,

Fig. 5 is a fragmentary sectional view taken on line 5--5 of Fig. 2,

Fig. 6 is a sectional view taken on line-6 6 of Fig. 5,

Fig. 7 illustrates in an enlarged scale the connection between an end portion of 'a burnisher and a power-driven rockable actuating element,

Fig. 8 is a Vertical sectional view of a burnisher,

ling-down bridge cooperating with a dusting band of the machine,

Fig. 13 is an elevational view of a rotary brush cooperating with a dusting band,

Fig. 14 is a sectional view taken on line l4-I4 of Fig. 13, N

Fig. 15 is a diagrammatical View illustrating the setting of the holding-down rollers on the holding-down bridges in accordance with the size of the sheet passing through the machine,

Fig. 16 is a vertical sectional View `of another embodiment of a burnisher, and

Fig. 1'7 is a-sectional view taken on line ll-l'l of Fig. 16.

Referring to Fig. l, 20 generally indicates the supplying or depositing section of the bronzing machine, wherein a metallic powder for example bronze powder, is supplied to sheets fed to the machine by a conveying band 2 and placed in the machine on a conveying belt or conveyor 24 for passage through the machine in the direction of the arrow A.

26 generally indicates the coating section of the bronzing machine, wherein predetermined surfaces of the sheets placed on the conveyor 24 are coated with the metallic powder and the thus coated surfaces are burnished.

28 generally indicates the cleaningsection of the bronzing machine, wherein excess metallic powder is removed from those portions of the sheets which shall not be coated with the metallic powder.

As best shown in Figs. 2, 3, 5 and 6, a main driving shaft 30 is journalled in suitable bearings of the frame of the machine. Said main driving shaft 3D may be rotated by means of a motor (not shown) through the medium of a belt 32 trained around a pulley keyed to the right-hand end of the driving shaft 3D, as viewed in Figs. 5 and 6. A bevel gear 34 keyed to the left-hand end'of said main driving shaft 30 is in mesh with a bevel gear'36 keyedA to a transverse shaft 38 journalled in suitable bearings of the machine. v i

'chine at 68.

`ranged on the wall of the machine. set screws 82, 84 are in the position shown in -tatable rollers |00, |02.

machine and around tensioning rollers 44 and 46 carried by the tensioning mechanisms 48 and 50 respectively.

As best shown in Figs. 1 and 2 the tensioning mechanism 48 comprises two. `bell-crank levers 52, each of which being swingably mounted at 54 at a side of the machine. Thel tensioning roller 44 is rotatably arranged in the arms 56 of the bell-crank levers 52. The arms 58 of the bell-crank levers 52 are provided with a slot 60 receiving the stem of an adjusting screw 62,

by means of which the bell-crank levers 52 may be held in a predetermined position.

The tensioning mechanism 50 is best shown in Figs. 1 and 3. The tensioning roller 46 is rotatably arranged in arms 64 of bell-crank levers 66 swingably mounted on each side of the ma- The dow'nward extending arm of each bell-crank lever 66 is pivotally connected at with one end of a connecting rod 12, the other end of which is pivoted to an arm 14 keyed to a shaft 16 rotatably arranged in the frame of the machine. A handle 18 having an upwardly extending arm 80 is keyed to the end of the shaft 16 projecting outwardly from the wall of the machine. tends into a spacey between two set screws 82, 84 screwed into threaded bores of lugs 86, 88 ar- When the Fig. l, the arm 80 and the handle 18 as well as the tensioning roller 46 are iirmly held in the position shown in Fig. 1 so as to subject the conveyor 24 to a predetermined tension. If it is desired to adjust the tension in the conveyor 24, one of the set screws 82, 84 is turned so as to make space for a movement of the arm 80 and the handle 18 resulting in a corresponding displacement of the tensioning roller 46, whereupon the handle 18 is again held in its set position by turning the other set screw until the arm 80 is again rmly gripped by the said set screws 82, 84.

As -shown in Fig. 5, thetransverse shaft 38 carries also a gear 90 in mesh with a gear 92 keyed to a shaft 94 rotatably arranged in the machine. As best shown in Fig. 1, said shaft 94 carries a supplying roller 96 of the supplying section 20.1 Said supplying roller 96 is arranged for supplying the metallic powder to the sheets placed on `the conveyor 24. In order to adjust the position of the supplying roller 96 relative to the surface of the conveyor 24 in accordance with the thickness of the sheets fed to the machine, the bearings carrying the shaft 94 may be adjusted by means of the adjusting mechanism generally indicated by 98 in Fig. 5. The supplying section further comprises two ro- The latter is arranged at the delivery end of a funnel |04 receiving the supply of metallic powder. The amount of metallic powder to be supplied from the funnel |04 through the rollers |02, |00 and 96 to the sheets fed to the machine may be regulated by an adjustable counter'weight |06 (see Fig. 5) actingl on the shaft |08 carrying the roller |02.-

Said upwardly extending arm 80 ex- According to Fig. 1 the coating section 26 o' the bronzing machine comprises four burnishers ||0. Each burnisher I0 includes a rod ||2, which is of substantially square cross section in its center part and has round end portions ||4 and I6 as best shown in Figs. 3, 1 and 8. Wooden blocks H8, |20 are rigidly attached to diametrically opposite surfaces of the square center portion of the rod H2, preferably made of steel. Fabrics |22,- |24 having fur lining |26, |28 are laid around said wooden blocks ||8 and |20 and are attached to the rod ||2 by meansl of screws |30. Thus, each burnisher ||0 is provided with two surfaces |32, |34, which may be alternatively usedl for burnishing the coated surfaces of the sheets placed on the conveyor 24.

As best shown in Figs. 3, 4 and 7 the round end portion ||4 of each burnisher i0 is slidably and rotatably engaged with a bore of the block-like bearing |36. Likewise, the round end portion |6 of each burnisher ||0 is slidably and rotatably engaged with a block-like bearing |38.

As best shown in Figs. 2, 4 and 'l each bearing |38 of the series of bearings |38 is slidably but axially immovably arranged in a vertical slot |40 of a guiding member |42 rigidly secured to the frame of the machine. Each bearing |38 rests on a spring |44, one end of which is arranged in a recess of the guiding member |42.

The bearings |38 may be held in the slots |40 of the guiding member |42 by means of a locking plate |46 shown in a disengaged position in Fig. 4 and shown in an engaged position in Figs. 3, 5 and '7. The left-hand end of the locking plate |46 (as viewed in Fig. 4) may be engaged with a recess |48 of a holding element |50 secured to the guiding member |42. The right hand end of the locking plate |46 is provided with a slot |52. A locking screw |54 swingably mounted at- |56 on the guiding member |42 maybe engaged with said slot |52 when the locking plate |46 is in the locking position shown in Fig. 5. A locking nut |58 engaged with the locking screw |54 may be used for holding the locking plate |46 in its locking position.

The locking plate |46 is further provided with four threaded bores, each of which receiving a 'set screw |60. When the locking plate |46 is brought into its locking position shown in Figs. 3, 5 and 1, each set screw |60 may be brought into engagement with a bearing |38 so as to urge same against the action of the spring |44 into a predetermined position so as to bring the burnishers into a predetermined position relative to the conveying belt 24, as required by the thickness of the 'sheets to be transported through the machine. Thus, the position of the burnishers may be individually adjusted by the set screws |80.

The series of bearings |36 (see Fig. '3) engaged with the end portions H4 of the burnishers I0 at the other side of the machine are in the same manner slidably and adjustably arranged in slots |62 of a guiding member |64 mounted on the frame of the machine. The locking plate |66 disengageably mounted on the guiding element |64 is provided with a series of set screws |68 each of which being arranged for setting the associated bearing |36 in a predetermined position against the action of a spring |10.

The right hand end portion ||6 of each burnisher l0 (as viewed in Fig. 3) is provided with a head |12 rigidly connected with said end portion- |6. As best shown in Figs. 3, 5 and '1, each head |12 of the' end portion I6 of each burnisher ||0 is provided with a pin |14 or the like at each l side thereof. Each pin |14 is slidably engaged with a recess |16 of the forked end of a rocking :element |18 swingably mounted on a shaft |80 of the machine. In the embodiment shown in the drawings, the recesses |16 are open at the top so that the pins |14 may be disengaged from said recesses for a purpose to be described hereinafter. However, if the pins |16 are engaged with the recesses |16 as shown in the drawings, there is a positive connection between the rocking elements |18 and their associated burnishers I I6, so that the latter will be reciprocated in a direction transversely of the direction of the movements of the sheets placed on the conveyor belt 24, when the rocking elements |18 are oscillated about their pivot |80.

As best shown in Figs. 3 and '7, each rocking element |18 has two guiding bars |82 exchangeably mounted thereon by means of screws or the like. The pair of. guidingbars |62 of each rocking element |16 is slidably engaged with a sliding block |64 which, in turn, is positively engaged with an eccentric sheave |66 keyed to the main driving shaft 36. Preferably, the eccentric sheaves |86 are set in such a manner on the main driving shaft36 that the four burnishers I6 are reciprocated in a staggered manner.

The large sliding surfaces of the guiding bars |82 result in a smooth operation of the machine and `cause only little Wear and tear of the eccentric drives.

As known in the art, those portions of the surface of sheets which shall be coated with a metallic powder, for example, a bronze powder, are provided with a layer of a so-called goldsize before the sheets are fed into the bronzing machine. For example, a goldsize is applied to certain portions of the sheets in a printing press (not shown in the drawings) which delivers the thus sized sheets to the conveying belt 22, shown invFig. 1. When the sized sheets enter the bronzrlg machine, obviously, the burnishers |||l are brought into contact with the sized portions of the sheets and tend to absorb to a certain degree the goldsize in their burnishing surfaces, whereby the burnishing surfaces become humid. If the humidity of the burnishing surfaces exceeds a certain degree, the polishing effect of said burnishers will be reduced andthe humid burnishers rub the metallic powder also onto such portions of the sheet surfaces which should not be-coated with the metallic powder. Such a disadvantageous condition of the burnishers can be readily eliminated in the brcnzing machine according to the invention.

kIf the bronzing machine according to the invention was in operation for a certain time and the burnishing surfaces |34 of the burnishers ||0, which are in the active position facing the conveyor 24 become rather humid, the machine is stopped. Thereupon, the locking plates |46 and |66 are disengaged from the guiding members |42 and |62 respectively. Now, each burnisher ||6 can be lifted to a certain degree (the bearings |36 and |38 sliding in the slots of the guiding members but remaining engaged with said slots) until the pins |14 are disengaged from the slots |16 of the associated rocking element |18. Aftersaid disengagement has taken place, the burnisher ||0 is rotated in the bearings |36 and |38 through an angle of 180, so that now the previously inactive and dry burnishing surface |32Ucomes into the position facing the conveyor 24. Thereafter, the burnisher ||6 lmay belowered, the pins |14 coming again in engagement L.

with the slots |16 of the rocking elements |16 and the bearings |36 and |38 sliding downwardly in the slots |62 and |40 of the guiding members |64 and |42. Then the locking plates |66 and |46 are again engaged with the guiding members |64 and |42 and held in their locking position by the swingable locking device (|54, |56). As the adjustment of the set screws |60 and |68 respectively has not been changed, yit will be readily understood that after above described turning of the burnishers H0, the now active burnishing surface facing the conveyor 24 will be in the same position as the previously active burnishing surface now being disposed at the upper portion of the burnisher.

Above described turning of the burnishers may be accomplished in a short time of 1-2 min.

Now the bronzing machine may be operated again for a certain time. If the now active burnishing surfaces are becoming too humid, the now inactive burnishing surfaces are again sufficiently dry so that said now inactive burnishing surfaces may be brought into an active position for further use by the same manipulation and rotation of the burnishers as described above.

The burnisher ||6c shown in Figs. 16 'and 17 has two burnishing surfaces |320 and |34c similar to the burnisher H6 shown in Figs. 1, 3 and 8. However, the burnisher |60 is made of a hollow body ||9c closed at its ends by end walls ||1c. A rod or end portion ||6c is inserted at each end of the burnisher into a bore of the end wall |1c and is rigidly connected thereto in any suitable manner. One of said rods ||6c is provided with a head similar to the head |12 of the end portion ||6 of the burnisher ||0 for engagement with a rocking element |18.

Fig. 9 illustrates another embodiment of burnishers ||6a which may be used in a bronzing machine according to the invention. The hollow burnishers shown in Fig. 9 have three burnishing surfaces |32a, |33a, |3lzt being arranged at angles of 60 relative to each other. The burnishing surface |34a of the burnishers la is shown in the active position facing the conveying belt 24.

In a preferred embodiment, the round end portion ||6a of each burnisher passing through the bore of a bearing |38 of the bronzing machine as shown in Fig. 1l has a cylindrical stud ||1a of reduced diameter. A head or connecting element |12a having a cylindrical bore |13a is rotatably arranged on said stud ||1a of the end portion ||6a. The head |12a and the stud ||1a are held in engagement with each other by suitable means, for example, by a resilient split-ring |15a. A pin |146; is arranged on each side of the head |12a. Each pin |14a is slidably engaged with a recess |16 of the forked end of a rocking element |18 in the same manner as the pins |14 of the burnisher I6 shown in Fig. 3 are engaged with the open recesses |16 of the rocking elements |18. 2

Thus, when a burnisher ||6a (see Fig. 9) shall be rotated so as to bring its formerly active burnishing surface |3405 into an inactive position and to bring its burnishing surface |330, into an active position facing the conveyor belt 24, after the disengagement of the locking plate |66 (see Fig. 1l) from the guiding member |42, the burnisher ||6a is lifted together with the bearing |38 to. such an extent, that the burnisher may be rotated in its bearings. If during such a. rota- .tion the pins |14a of the head |12a are still in engagement with the slots |16 of the rocking'el'e'- ment 118, the end portion 116:1'I of the burnisher I 10a will be rotated relative to the head 1120.. If during such a rotation the pins 1`14ar of the head 112a are out of engagement with the slots 1'16, the head 1'12a may be readily turned relative to the end portion 116a after the performance of the rotation of the burnisher 11011. so as to bring the pins 114e being in coaxial alignment with each other in engagement with the slots 1'18 of the forked end of the rocking element 1'18.

As will be readily understood, the arrangement of a head 1'l2a rotatable relative to the round end portion I16a yof a burnisher may also be employed for a burnisher having only two burnishing surfaces opposite each other, as shown in Figs. 1, 8 and 16, for example. If such an arrangement is used, the slots of the rocking elements 1'18 could also be closed at the top; of course, they must be suiciently long enough so as to permit the necessary lifting of the burnishers for the performance of a rotation thereof.

Fig. 10 illustrates a further embodiment of burnishers 110b which could be used in a bronzing machine according to the invention instead of the burnishers 110. The hollow burnishers 110b shown in Fig. 10 have four burnishing surfaces 181b, 1321 1331), 13419 arranged at an angle of 90 relative to each other, the burnishing surface 134i) being shown in active position facing the conveyor belt 24.

The cleaning section 28 (see Fig. 1) comprises three endless dusting bands 188 of leather having a plush lining. As best shown in Figs. l, 2, 5 and 6, each dusting band 188 is trained around a driving pulley 190 arranged on a shaft 192 journalled in suitable bearings 194 of the machine, a pulley 19S arranged on a bridge 198 adjustably mounted in the machine, a pulley 200 arranged on said shaft 192, a series of holding-down rollers 202, 204, 295 adjustably arranged at one side of the bridge 198, a pulley 208 arranged on a shaft 210 journalled in suitable bearings 212 of the machine, a pulley 214 arranged on said bridge 198, a pulley 216 arranged on the last-mentioned shaft 210, and a series lof holding-down rollers 218, 220, 222-adjustably arranged on said bridge 198. According to Fig. 5, the hub 224 of each driving pulley 190 is keyed to the shaft 192; furthermore, a gear 226 in mesh with a gear 228 keyed to the main driving shaft 30 is keyed to said shaft 192. Therefore, when the main driving shaft 30 of the machine is rotated by the motor through the belt drive 32, the shaft 192 is, likewise, rotated causing a rotation of the driving pulleys 190 which, in turn, cause a movement of the dusting bands 18S in a direction transversely of the direction of the movement of the sheets through the machine.

Each of the pulleys 209 is rotatably but axially immovably arranged on the shaft |92.

Asbest shown in Fig. 6 the hub 230 of each pulley 208 opposite the last-mentioned pulley 200 is keyed to the shaft 210, so that the latter is rotated when the pulley 208 is driven by the dusting band 168. A gear 232 keyed to said shaft 210 is in mesh with a gear 234 (see Fig. 2) keyed to a shaft 236 journalled in suitable bearings of the machine.l

Each pulley 216 (see Figs. 2 and 6) is rotatably but axially immovably arranged on the shaft 210.

Each pulley 214 (see again Figs. 2 and 6) is rotatably arranged on a shaft 258 secured to the bridge |98,

Each pulley 196 is rotatably arranged on a shaft 240 carried by a bracket 242 slidably and adjustably mounted on the bridge 198. Th bracket 242 may be displaced toward and away from the center of the machine and may be held in its adjusted position by means of screws 244. As will be readily understood, the tension in a dusting band 188 may be `adjusted by an adjustment of said bracket 242 carrying the pulley 196. According to Figs. 1 and 2 each bridge 198 is provided with a series of holes 246 arranged along the length of the bridge across the machine; Each of above-mentioned holding-down rollers 202, 204, 206, 218, 220, and 222 is rotatably arranged on a stud 248 having a head at one of its ends and having a screw-thread at its other end. Each of said studs 248 may be selectively inserted into one of the holes 246, so that the holding-down rollers 202, 204, 206, 218, 220, 222 may be arranged at predetermined distances from the center of the machine for a purpose to be described hereinafter. The studs 248 carrying the holding-down rollers may be firmly held in the bores 246 of the bridge 198 by means of nuts screwed onto the threaded end of the studs.

According to Figs. 2 and 12 each bridge 198 has a bore 250 at each end thereof. A sleeve 242 rotatably arranged in such a bore has a head 254 resting on the upper surface of the bridge 198. The sleeve 252 carries at its lower end a split-ring 256 or the like abutting against the lower surface of the bridge 198, so that the sleeve 252 is axially immovable relative to the bridge 198. The inner bore of the sleeve 252 is provided with a ne gauge thread which, in turn, is in engagement with a corresponding thread on a bolt 258 rigidly secured to the frame of the machine. Furthermore, the head 254 of the sleeve 252 is provided with a scale 260 arranged for cooperation with a pointer 262 mounted on the bridge 198. The sleeve 252 which can be rotated in the bridge 198 but cannot be axially displaced relative thereto as mentioned above acts as a micro-meter device. A rotation of said sleeve 252 will cause a lifting or lowering of the bridge 198 gripped between the head 254 and the splitring 256 of said sleeve, as during such a rotation of the sleeve 252 the latter being in engagement with the threaded portion of the bolt 258 will be moved upwardly or downwardly. The sleeve 252 may be held in its adjusted position by means of a locking nut 264 screwed on the threaded portion of the bolt 258.

Obviously, the micrometer device 252- 258 permits a fine adjustment of the distance between the holding-down rollers-202-206` and 218--222 arranged on the bridge 198 relative to the surface of the conveying belt 24, so that the position of the dusting bands 188 held down by the holdingdown rollers may be readily adjusted in accordance with the thickness of the sheets transported through the machine.

The dusting bands 188 may also be readily adjusted in accordance with the size of the sheets transported through the machine. If, for eX- ample, sheets of substantially the width of the conveying belt 24 are transported through the machine, the holding-down rollers 202-205 and 218-222 may be arranged in the manner shown in Fig, 2. If sheets 266 (see Fig. l5) of a size somewhat smaller than the width of the conveying belt 24 are transported through the machine. the holding-down roller 218, for example, may be brought into the position 218 wherein its stud is engaged with the third hole 246 of the bridge 198 from the right.

In any case, the adjustable arrangement of the holding-down rollers on the bridges |98A permits an arrangement of the holding-down rollers in such a way that the holding down roller first engaged by the dusting band |88 when it runs along the surface of a sheet, i. e., the holding-down roller 2|8 (2|B') on one side of the bridge |98 and the holding-down roller 202 on the other side of thebridge |98, is somewhat inside of the edge of the sheet 266 as clearly shown in Fig. 15. Thus, the dusting band |88 cannot cause damage to the edge of the sheets 266 when it runs onto them.

The holding-down rollers at the running-off side 0f the dusting band |88, i. e., the holdingdown roller 222 on one side of the bridge |98 and the holding-down roller 206 at the other side of the bridge |98 may always remain at the very end of the bridge |98; of course, if desired, they may be connected to a different hole of the bridge ['98, but in any case, said holding-down rollers should be somewhat outside the edge of the sheet 260 as shown in Fig. l5.

Moreover, depending on the size of the sheets, two (see, forexample, Fig. 15), three (see, for example, Fig. 2) or more holding-down rollers may be arranged on each side of the bridge |98.

`As mentioned above, the main driving shaft 30 and the shaft 236 (see Figs. 2 and 5) are rotated during the operation of the machine. The main driving shaft 30 is directly driven by the motor through the belt drive 32 and the. shaft 236 is driven by the main driving shaft 30 through the train of gears 228, 226, the shaft |92, the dusting bands |88, the shaft 2li! and the train of gears 232, 234. Three rotary 'brushes 268 are arranged on each of said shafts 30 and 236, each of said rotary brushes cooperating with that portion of a dusting band, which comes from a sheet after having excess metallic powder removed therefrom.

As best shown in Figs. 3 and 14, each rotary brush 268 comprises two halves 210, 212 carrying the brushes at their circumference. Said halves 210, 212 are provided with shoulders 214, 216, 218, 280. Flanged discs 282', 284 having a center bore engaged with the shaft 30 (or 236) are arranged at the sides of the halves 210, 212. The flanged discs 282, 284 are engaged with the shoulders 214--280 of said halves 210, 212 so as to hold same together. Set collars 286, 238 arranged next to the flanged discs 282, 284 are secured to the shaft 30 (or 236) by set screws 290, 292 or the like. E'ach set collar 286, 288 is connected with a half 210 or 212 of the rotary brush 268 by means of a screw 294 or 296 respectively. .Thus, the body of the rotary brush 268 ispositively coupled with the shaft 30 or 236. Ducts 302, 304, 306 and 388 shown in Figs. 2

and 3 are arranged for leading dust stirred up during the operation of the machine into collecting containers (not shown).

The operation of the machine is as follows: j The funnel |04 is filled with a metallic powder. 'I 'he burnishers l |0 are connected with the rockable actuating elements |78 as shown in the drawings. The burnishers l l0 are set Iwith their active burnishing surfaces |34 in a predetermined position relative to the surface of the conveying belt 24 by means of set screws |60, |88 in accordance with the thickness of the sheets to be transported through the machine. The position of the Adusting bands is adjusted in accordance with the thickness of the sheets and the size of the sheets by means of the micrometer devices 252, 2,54 and by means of an adjustment of the position of the holding-down rollers. 202-206 and 2|8-222 on the bridges |98. When the machine is started, the conveyor 24 is moved, the powdersupplying roller 96 is rotated, the burnishers ||0 are reciprocated, the dusting bands |88 are moved and the rotary brushes 268 are rotated. Sheets coming from any suitable place, for example. from a printing press, which are fed to the bronzing machine by means of the conveying belt 22 reach the conveying belt 24 and are gripped by the supplying roller 96 and a holding` bar 298 (see FigT 1). The conveying belt 24 transports the sheets to the burnishing section 26 wherein the burnishers ||0 coat and polish their surfaces and continues to transport same through the cleaning section 28 wherein the dusting Abands |88 remove excess metallic powder from the sheets. The sheets leaving the machine at the delivery end reach a delivery conveyor 300 by means of which they are transported to a suitable place. During the operation of the machine, excess metallic powder adhering to the dusting bands is removed therefrom by means of th rotary brushes 268.

After a certain time of operation, the machine may be stopped for turning the burnishers ||0 in the manner described above so as to bring the previously active burnishing surfaces of the burnishers into an inactive position and the previously inactive burnishing surfaces into the active position. Thereafter, the operation of the machine may be continued. i

I have described preferred embodiments of my invention, but it is understood that this disclosure is for the purpose of illustration and that various omissions or changes in shape, proportion and arrangement of parts as Well as the substitution of equivalent elements for those hereinshown and described may be made without departing from the spirit and scope of the invention as set forth in the appended claims.

What I claim is:

1. A bronzing machine comprising in combination: power driven conveying means arranged for transporting sheets through the machine in a predetermined direction, supplying means arranged for supplying metallic powder to such sheets, a series of power driven burnishing elements arranged for burnishing a metallic powder supplied to such sheets, a series of power driven dusting bands arranged for moving along the surface of said conveying means in a directiontransversely of the direction of movement of sheets placed on said conveying means so as to remove excess metallic powder from such sheets, a series of holding-down bridges extending across the machine, each bridge carrying a plurality of holding-down rollers arranged for cooperation with a'dusting band so as to hold same down towards said conveying means, each bridge being adjustable, and micrometer devices associated with said bridges for adjusting same in a predetermined position relative to said conveying means.

` 2. A bronzing machine comprising in combination: power driven conveying means arranged for transporting sheets through the machine in a predetermined direction, supplying means arranged for supplying a metallic powder to such sheets, a series of power driven burnishing elements arranged for burnishing a metallic powder supplied to such sheets, a series of power drivenv dusting bands arranged for moving along the surface of said conveying means in a direction transversely of the direction of movement of sheets placed on said conveying means so as to remove excess metallic powder from siich sheets, a` series of holding-down bridges extending across the machine, said bridges being adjustably' ar'- ranged, adjusting means associated with said bridges for adjusting same in a predetermined position relative to said conveying means, a series of holding down rollers on each bridge for cooperation with a dusting band so as to hold same down towards said conveying means, said rollers being adjustably arranged on said bridges, and setting means associated with said rollers for setting same at predetermined distances from the center of the machine.

3. A bronzing machine comprising in combinat-ion: power driven conveying means arranged for transporting sheets through the machine in a predetermined direction, supplying means arranged for supplying metallic powder to such sheets, a series of power driven burnishing elements arranged for burnishing a metallic powder supplied to such sheets, a series of power driven dusting bands arranged for moving along the surface of said conveying means in a direction transversely of the direction of movement of sheets placed on said conveying means so as to remove 'excess metallic powder from such sheets, a series of holding-down bridges extending across the machine, said bridges being adjustably arranged, adjusting means associated with said bridges for adjusting same in a predetermined position relative to said conveying means, a series of holding-down rollers associated with each bridge for cooperation with a dusting band so as lto hold same down towards said conveying means, a plurality of coupling means arranged along. the length of each bridge, and means for connecting a selected number of said rollers with selected coupling means on said bridges whereby the rollers may be set at predetermined distances from the center ofthe machine.

4. A bronzing machine comprising in combination: power driven conveying means arranged for transporting sheets through the machine in a predetermined direction, supplying means arranged for supplying metallic powder to such sheets, a series of power driven burnishing elements arranged for burnishing a metallic powder supplied to such sheets, a series of power driven dusting bands arranged for moving along the surface of said conveying means in a direction transversely of the direction of movement of sheets placed on said conveying means so as to remove excess metallic powder from such sheets, a series of holding-down bridges extending across the machine, said bridges being adjustably ar- 3' ranged, adjusting means associated with said bridges for adjusting same in a predetermined position relative to said conveying means, each ofmsaid bridges being provided with a plurality of holes along its length, a series of holdingdown rollers, a series of studs rotatably carrying said rollers, and connecting means for connecting said studs with selected holes of said bridges whereby the rollers may be set at predetermined distances from the center of the machine for cooperation with a dusting band so as to hold same down towards said conveying means.

5. Abronzing machine comprising in combination: power driven conveying means arranged for transporting sheets through the machine in r a predetermined direction, supplying means arranged for supplying metallic powder to such sheets, a series of power driven burnishing elements arranged for burnishing a metallic powder supplied to such sheets, a series of power driven dusting bands for moving along the surface of said conveying means in a direction transversely of the direction of movement of sheets placed on said conveying means so as to remove excess metallic powder from such sheets, at least one power driven shaft, a series of split rotary brushes connected with said shaft and arranged for cooperation with the dusting bands, each of said split rotary brushes including a plurality of parts carrying brushes, and means for connecting the parts of a split brush with each other.

6. A bronzing machine comprising in combination: power driven conveying means arranged for transporting sheets through the machine in a predetermined direction, supplying means arranged for supplying metallic powder to such sheets, a series of power driven burnishing elements arranged for burnishing a metallic powder supplied to such sheets, a series of power driven dusting bands arranged for moving along the surface of said conveying means in a direction transversely of the direction of movement of sheets placed on said conveying means so as to remove excess metallic powder from such, sheets, at least one power driven shaft, a series of split rotary brushes connected with said shaft and arranged for cooperation with the dusting bands, each of said split rotary brushes including a plurality of parts carrying brushes, each of said parts of a split brush having a shoulder at each side, anged discs arranged at the sides of said parts, each disc having a bore receiving said shaft and being engaged by its flange with said shoulders so as to hold said parts together, and set collars secured to said shaft and .to said discs.

7. In a bronzing machine the combination of: power driven conveying means arranged for transporting sheets through the machine in a substantially horizontal direction, a series of burnishing elements, a series of sets of bearings, the burnishing elements of said series of burnishing elements being reciprocable in sets of bearings of said series of sets of bearings for reciprocating movements in a direction transversely of the direction of movements of sheets placed on said conveying means, each burnishing element having at leasttwo burnishing surfaces and being adjustable for selectively bringing one of its burnishing surfaces into an active position facing the conveying means and bringing its other burnishing surface into an inactive position, upwardly extending guiding means mounted on each side of the machine, said sets of bearings being movably engaged with said guiding means for displacement of the associated burnishing element towards and away from the conveying means, holding means associated with said bearings for holding same in a predetermined position relative to said guiding means, and a drive associated with said burnishing elements for reciprocating same.

8. In a bronzing machine the combination of: power driven conveying means arranged for transporting sheets through the machine in a substantially horizontal direction, a series of burnishing elements, a series of sets of bearings, the burnishing elements of said series of burnishing elements being reciprocable in sets of bearings of said series of sets of bearings for reciprocating movements in a direction transversely of the direction of movements of sheets placed on said conveying means, each burnishing element having at least two burnishing surfaces and being adjustable for selectively bringing one of its burnishing surfaces into an active position facing the conveying means and bringing its other burnishing surface into an inactive position, a guiding member mounted on each side of the machine, 'each guiding member being provided with a series of upwardly extending slots, said setsof bearings being movably engaged with said slots of vsaid guiding members for displacement of the associated burnishing element towards and away from the conveying means, holding means associated with said bearings for holding same in a predetermined position in said slots, and a drive associated with said burnishing elements for reciprocating same.

9. In a bronzing machine as claimed in claim 7, said bearings being in releasable engagement with said guiding means.

" l0. In a bronzing machine the combination of: power driven conveying means arranged for transporting sheets through the machine in a substantially horizontal direction, a series of burnishing elements; a series of sets of bearings, the burnishing elements of said series of burnishing elements being reciprocable in sets of bearings of said series of sets of bearings for reciprocating movements in a direction transversely of the direction of movements of sheets placed on said conveying means, each burnishing element having at least two burnishing surfaces and being adjustablel for selectively bringing one of its burnishing surfaces into an active position facing the conveying means and bringing its other burnishing surface into an inactive position, upwardly extending guiding means mounted on each side of the machine, said sets of bearings being movably engaged with said guiding means for displacement of the associated burnishing velement towards and away from the conveying means, vholding means associated with said bearings'for holding same in a predetermined position' relative to said guiding means, a series of power driven actuating means, and at least one upwardly extending guide on each of said actuating means, each burnishing element being yin positive and ymovable engagement with the guide of an associated actuating means of said series f of actuating means.

11. In a bronzing machine as claimed in claim 1`0said burnishing elements being in releasable engagement with said guides of `the actuating means.

12. In a bronzing machine the combination of: power driven conveying means arranged for transporting sheets through the machine in a `substantially horizontal direction, a series of burnishing elements, a series of sets of bearings, the burnishing elements of said series of burnishing elements being reciprocable in sets of bearings ofk said series of sets of bearings `for reciprocating movements' in a direction transverselyof the direction oi movement of sheets placed on said conveying means, each burnishing element having at leasttwo burnishing surfaces and being adjustable for selectively bringing one of itsk burnishing surfaces into. an active position facing the conveying means and bringing its other burnishing surface into an inactive position, a guiding member mounted on each side of the machine, each guiding member being provided vwith a series of upwardly extending slots, said sets of bea-rings being movably engaged with said slots of said guiding members for displacement of the associated burnishing element towards and away from the conveying means, holding means associated with said bearings for holding saine in a predetermined position in said 14 slots, and a series of power driven actuating means, each actuating means having at least one upwardly extending slot, and each burnishing element being in positive and movable engagement with the slot of an associated actuating means of said series of actuating means.

13. In a bronzing machine as claimed in claim 12, said bearings being in releasable engagement with the slots of the guiding members, and lo said burnishing elements being in releasable engagement with the slots of the actuating means. 14. In a bronzing machine as claimed in claim 7, each of said burnishing elements being rotatably arranged in its associated bearings wherels by after a displacement away from the conveying means the burnishing element may be rotated relative to its bearings for bringing one of its burnishing surfaces into the active position facing the conveying means. 2u l5. In a bronzing machine the combination of: power driven conveying means arranged for transporting sheets through the machine in a substantially horizontal direction, a series of burnishing elements, a series of sets of bearings, gr, the burnishing elements of said series of burnishing elements being reciprocable in sets of bearings of said series of sets of bearings for reciproeating movements in a direction. transversely of the direction of movements of sheets placed on gg said conveying means, each burnishing element having at least two burnishing surfaces and being sdiustable for selectively bringing one of its burnishing surfaces into an active position facing the conveying means and bringing its other 35 burnishing surface into an inactive position, up-

wardly extending guiding means mounted on each side of the machine, said sets of bearings being movably engaged with said guiding means for displacement of the associated burnish- 40 ing element towards and away from the conveying means, settable holding means arranged onA said guiding means, said settable holding means being capable of abutting engagement with said bearings so as to hold same in a predetermined position relative to said guiding means `upon a displacement of the burnishing elements towards the conveying means, and a drive associated with said burnishing elements for reciprocating same. y 16. In a bronzing machine the combination of: power driven conveying means arranged for transporting sheets through the machine in a substantially horizontal direction, a series of burnishing elements, a series of sets of bearings, the burnishing elements of said series of burnishings elements being reciprocable in sets of bearings o'i said series of sets of bearings for reciprocating movements in a direction transversely of the direction of movements of sheets g1) placed on said conveying means, each burnishing element having at least two burnishing surfaces and being adjustable for selectively bringing one of its burnishing surfaces into an active position facing the conveying means and bringc5 ing its other burnishing surface into an inactive position, a guiding member mounted on each side cf the machine, each guiding member being provided with a series of upwardly extending slots open at the top, said sets of bearings being 7o slidably and removably engaged with said Slots of guiding members for displacement of the associated burnishing element vtowards and away from the conveying means, springs arranged at the bottom of the slots of the guiding members for supportingthe bearings when inserted therein, a locking element detachably mounted lon each guiding member, a series of adjustable setting means arranged on each locking element for cooperation with the upper surface of said bearings so as to hold same in a predetermined position in said slots against the action of said springs, and a drive associated with said burnishing elements for reciprocating same.

17. In a bronzing machine the combination of power driven conveying means arranged for transporting sheets through the machine in a substantially horizontal direction, a series of burnishing elements, a series of sets of bearings, the burnishing elements of said series of burnishing elements being reciprocable in sets of bearings of said series of sets of bearings for reciprocating movements in a direction transversely of the direction of movements of sheets placed on said conveying means, each burnishing element having atleast two burnishing surfaces and being adjustable for selectively bringing one of its burnishing surfaces into an active position facing the conveying means and bringing its other burnishing surface into an inactive position, a guiding member mounted on each side of the machine, each guiding member being pro vided with'a series of upwardly extending slots open at the top, said sets of bearings being slidably and removably engaged with said slots of said Vguiding members for displacement of the associated burnishing element toward and away from the conveying means, springs arranged at the bottom of the slots of the guiding members for supporting the bearings when inserted therein, a locking element detachably mounted on each guiding member, a series of adjustable setting -means arranged on each locking element for cooperation with the upper surface of said bearings so as to hold same in a predetermined position in said slots against the action of said springs, a series of power driven actuating means, and at least one upwardly extending guide on each of said actuatingmeans, each burnishing element being in positive and movable engagement with the guide of an associated actuating means of said series of actuating means.

18. In a bronzing machine as claimed in claim 17, said burnishing elements being in releasable engagement with said guides of the actuating means.

19. 'In a bronzng machine the combination of: power driven conveying means arranged for transporting sheets through the machine in a substantially horizontal direction, supplying means arranged for supplying metallic powder to such sheets, a series of burnishing elements, a series of sets of bearings, the burnishing elements of said series of burnishing elements being reciprocable in sets of bearings of said series of sets of bearings for reciprocating movements in a direction transversely of the direction of movements of sheets placed on said conveying means, each burnishing element having at least two burnishing surfaces and being adjustable for selectively bringing one of its burnishing surfaces into an active position facing the conveying means and bringing its other burnishing surface into an inactive position, upwardly extending guiding means mounted on each side of the machine, said sets of bearings being movably engaged with said guiding means for displacement of the associated burnishing element towards and away from the conveying means, holding means associated with said bearings for holding same in a predetermined position relative to said guiding means, a drive associated with said burnish- 16 ing elements for reciprocating same, a series of power driven dusting bands arranged for moving along the surface of said conveying means in a direction transversely of the direction of movement of sheets placed on said conveying means so `as to remove excess metallic powder from the Y' sheets, a series of holding-down bridges extending across the machine, each bridge carrying a plurality of holding-down rollers arranged for cooperation with a dusting band so as to hold same down towards said conveying means, each bridge being adjustable, and adjusting means associated with said bridges for adjusting same in a predetermined position relative to said-conveying means.

20. In a bronzing machine the combination of: power driven conveying means arranged for transporting sheets lthrough the machine in a substantially horizontal direction, Ysupplying means arranged for supplying metallic powder to such sheets, a series of burnishing elements, a series of sets of bearings, the burnishing elements of said series of burnishing elements being reciprocable in sets of bearings of said series of sets of bearings for reciprocating movements in a direction transversely of the direction of movements of sheets placed on said conveying means, each burnishing element having at least two burnishing surfaces and being adjustable for selectively bringing one of its burnishing surfaces into an active position facing the conveying means andbringing its other burnishing surface into an inactive position, upwardly extending guiding means mounted on each side of the machine, said sets of bearings being movably engaged with said guiding means for displacement of the associated burnishing element towards and away from the conveying means, holding means associated with said bearings for holding same in a predetermined position relative to said guiding means, a drive associated with said burnishing element for reciprocating same, a series of power driven dusting bands arranged for moving along Ithe surface of said conveying means in a direction transversely of the direction of movement of sheets placed on said conveying means so as to remove excess metallic powder from the sheets, a series of holding down bridges extending across the machine, said bridges being adjustably arranged, adjusting means associated with said bridges for adjusting same in a predetermined position relative to said conveying means, a series of holding down rollers on each bridge for cooperation with a dusting band so as to hold same down towards said conveying means, said rollers being adjustably arranged on said bridges, and setting means associated with said rollers for setting same at predetermined distances from the center of the machine.

' 21. In a bronzing machine the combination of: power driven conveying means arranged for transporting sheets'through the machine in a substantially horizontal direction, supplying means arranged for supplying metallic powder to such sheets, a series of burnishing elements, a series of sets of bearings, the burnishing elements of said series of burnishing elements being reciprocable in sets of bearings of said series of sets of bearings for reciprocating movements in a direction transversely of the direction of movements of sheets placed on said conveying means, each burnishing element having at least two burnishing surfaces and being adjustable for selectively bringing one of its burnishing surfaces into an active position facing the conveying means and bringing its other burnishing surface into an inactive position, upwardly extending guiding means mounted on each side of the machine, said sets of bearings being movably engaged With said guiding means for displacement of the associated burnishing element toward and away from the conveying means, holding means associated with said bearings for holding same in a predetermined position relative to said guiding means, a drive associated with said burnishing elements for reciprocating same, a series of power driven dusting bands arranged for moving along the surface of said conveying means in a direction transversely of the direction of movement of sheets placed on said conveying means so as to remove excess metallic powder from the sheets, a series of holding-down bridges extending across the machine, said bridges being adjustably arranged, adjusting means associated with said bridges for adjusting same in a predetermined position relative .to said conveying means, each of said bridges being provided with `a plurality of holes along its length, a series oi holdingdown rollers, a series of studs rotatably carrying 18 said rollers, and connecting means for connecting said studs with selected holes of said bridges whereby the rollers may be set at predetermined distances from the center of the machine for cooperation with a dusting band so `as to hold same down towards said conveying means.

LEOPOLD FALLER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 615,929 Waldron Dec. 13, 1898 820,666 Newell et al May 15, 1906 888,480 Friess et al May 26, 1908 1,107,773 Ford Aug. 18, 1914 1,140,642 Weingartner et al. May 25, 1915 1,238,561 Ohl Aug. 28, 1917 1,772,318 Lontke Aug. 5, 1930 1,846,547 Ferneding Feb. 23, 1932 2,065,306 Friess Dec. 22, 1936

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