US1290603A - Powdering-machine for plates to be etched. - Google Patents

Description

W J. LOGAN.

PUWDERl'NG MACHl-NE FOR PLATES TO BE ETCHED.

APPLICATION FILED DEC.28. 1916.

Patented Jan. 7, 1919.

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POWDERING MACHINE FOR PLATES TO BE ETCHED.

APPLICATION FILED DEC. 28, l9I6.

Patented Jan. 7, 1919.

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LOGAN.

POWDERING MACHINE FOR PLATES TO BE ETCHED.

APPLICATION FILED DEC. 28, 1916.

W. J LOGAN PUWDERING MACHINE FOR PLATES TO BE ETCHED. AiPLlCATiON FILED DEC. 2%, IQIE.

1,290,603. Patented Jan. 7, 1919.

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POWDERING MACHFNE FOR PLATES TO BE ETCHED.

APPLICATION FILED DEC. 28. 1915 1,290,603. Patented Jan. 7, 1919.

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Eh. 14 ja j6 W JLogan m I abhor/z NITED STATES PATENT OFFICE.

WILLIAM J. LOGAN, OF CLEVELAND, OHIO.

POWDERING-MACHINE FOR PLATES TO BE ETCHED.

State of Ohio, have invented certain pew; and useful Improvements 1n Powdermg- Machines for Plates to be Etched, of which the following is a specification.

This invention relates to a-machine for powdering printing plates preparato being etched, and has forits princip object to provide a machine capableof automatically carrying out the necessary successive operations for the accomplishment of this urpose.

The pliite to be powdered is laid upon the roller table of the machine, and it is carried through a chamber where the etching powder falls upon it. The powder covered plate passes under a stationary brush for removing the surplus powder and under transversely moving brushes for banking the remaining' powder on the plate against the lines of the design, and then over gas burners for baking the powder to the plate. After the baking process, the plate is cooled by air blast, and then travels back through the powdering chamber for another covering of powder. At this point, the plate is given a'one-quarter turn, :and as it passes .under the before mentioned brushes, it is dusted transversely to the first brushing. The powder. is then'baked to the plate as before, and the plate again cooled. The plate then travels back through the powdering chamber and said operations are repeated until the plate has been powdered and brushed four times, and the powder baked to the plate and the plate cooled each time. which prepares it for etching.

By the use of this machine, plates are powdered uniformly without the employment of skilled labor. It simply being nec essary to place the platesin the machine and the various successive steps will becar- 'ried out automatically.

In order that the invention may be clearly understood, the same will be herein-after fully described in connection with the accompanying. drawings, which are intended to simply illustrate the invention without limiting it to the particular form shown, and the novel features thereof will be distinctly pointed out in the appended claims.

Specification of Letters Patent.

Applicatica filed December 28, 1816. Serial No. 189,806.

In the drawings like characters'of refer-- ence indicate corresponding parts.

Figure 1 is a front elevation of a machine gonstructed in accordance with my inven- Fig. 2 is a plan view of the same,

3 is a rear elevation of the machine,

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

Fig. 5 is a similar view taken on line 54 of Fig. 3,

Fig. 6 is a view of a rear portion of the machine, the control carriage being at the commencement of-its advance movement,

Fig. 7 is a similar view after the control carriage has completed the same Fig. 8 shows the mechanism forturning on the gas, the control carriage being in the same position as in Fig. 6,

Fig. 9 1s a similar view, the control carriage having turned on the gas,

Figs. 10 and 11 illustrate the mechanism for stopping the advance movement of the roller table and then reversing its movement, the control carriage being in" the same positions respectively as in Figs. 6 and 7,

Fig. 12 is a plan view of the mechanism shown in Figs. Sand 11,

'Fig. 13 is a sectional view of a portion of the turning rack operating mechanism,

Fig. 14 is a plan view of the belt bushing,

Fig. 15 is a sectional plan taken on line 15 15 of Fig. 13,

Fig. 161s a perspective view of the turning rack guide plate,

Fig. 17 1s cross sectional view of the powder hopper and mechanism,

Fig. 1.8 is a side elevation of same,

Fig. 19 is an end view of Fig. 18, the driving sprocket wheels being removed,

bars 1 are fixed pairs of transversely a ining bearings 8, in which are mounted shafts 9 carrying disks 10 to form a roller table, and a pair of similar shafts 11 supporting elongated rollers 12, which carr endless bolts 13 having bars 14 attached t ereto to form a cooling platform. Said shafts extend beyond one side of the frame, are driven by similar bevel gears 15, which are driven by similar bevel gears 16 carried by a longitudinal shaft 17. This last named shaft'is supported b bearings 18 fixed to the frame of the mac inc, and at one end thereof is a gear wheel 19 whichis in mesh with a pinion 20 secured to a driving shaft 21. This driving shaft is mounted in bearings 22 car'- ried on the legs 3 and 5, and is adapted to be driven in either direction by means of a pair of the usual opposite bevel Wheels 23 and 24, which are loosely mounted on said shaft and driven by a bevel wheel 25. A clutch 26 being feather keyed to the shaft for causin either of said bevel wheels to rotate the s aft. The bevel wheel 25 is fixed to one end of an inclined shaft 27, which is supported in suitable bearings attached to the frame of the machine, and at the other end of this shaft is a bevel pinion 28, which meshes with a similar bevel pinion 29 secured to a longitudinal shaft 30 supported by bearing fixed to cross pieces 31 of the frame. The shaft 30is driven from a shaft 32, which is supported in bearings also carried by said cross pieces of the frame, and the latter shaft is driven by an electric motor 33, which transmits power through a chain 34 to a sprocket whee 35 on the shaft. Said shafts are operatively connected to ether by means of a pinion 36 meshing wit a gear 37. A shelf 38 attached to the frame is provided for supporting the motor.

Roller table reversing mechanism, (Figs. 3, 6 and 7 .)The before mentioned clutch 26 is slidably moved upon the shaft 21, to engage either of the bevel wheels 23 or 24 for causing rotation of said shaft in either direction, by means of the mechanism now to be described. Said clutch is engaged by a depending arm 39 fixed to a shift rod 40, which is slidably mounted in guide brackets 41 on the le s 4 and 5. Fixed on said rod are a pair 0 suitably spaced collars 42 and 43, and around the rod are coiled springs 44 and 45, which are adapted to abut said collars. A pair of locking levers 46 and 47 are pivoted to a late bracket 48 attached to atop side bar 0 the frame, and these arms carry blocks 49 and 50 for engaging the upper outer edges of said collars for holding the clutch26 in engagement with either of the bevel wheels 23 or 24. The shift rod 40 is forced longitudinally in either direction by a control carriage 51. Projecting from the control carriage is an arm '52 having a bifurcated end 53 for straddling the shift rod and for engaging the free ends of the coiled sprin s 44 and 45 for compressin the same. "he arm 52 carries horizonta arms 54 and 55 having rollers 56 .at their ends, for enga in cams 57 and 58 depending from the loo in levers 46 and 47 respectively to force t e same out of locking position. When said locking levers release the shift rod 40 it is forced longitudinally by the action of the compressed springs 44 and 45.

Control cawiage, (Figs. 3, 6 and 7.)The control carriage 51 is supported upon the threaded portion of a worm shaft 59, which is rotatab y mounted in bearings 60 and 61 fixed to the legs 4 and 5 respectively. Said worm shaft is driven in either direction from the shaft 21, by means of the pinion 62 and gear 63, which are fixed to said shafts.

This imparts reciprocating motion to the control carriage.

Twrm'mg mole, (Figs. 1-4, 6, 7, and 1316.)At the opposite end of the roller table from the coolin platform is arranged a turning rack, whic consists of a central hub 64 fixed to an upright rod 65 and carrying bars or slats 66 formin a rectangular shaped top adapted to strad le the disks 10 of the roller table. The purpose of this turning rack is to rotate the plate being prepared for etching a quarter turn each time it is powdered. Said turning rack top is normal y below the upper edges of the disks 10, and when the plate is carried to a position over the same, it rises up clear of it a quarter turn. This is one by the action of the control carriage 51 throu h the following mechanism. On the uprig t rod 65 of the turnin rack is a fixed flange 67, which is engage by the forked end 68 of a lever 69 fulcrumed at 70 to a cross piece 71 of the frame. The other end 72 of this lever is pivotally connected at 7 3 to a strap 74 which depends from and is pivoted at 75 to a sleeve 76 loosely mounted upon the worm shaft 59. The lower end of the upright rod 65 is slidably mounted in a guide bracket 77 fixed to a pair of cross pieces 78 of the frame, and is feather keyed at 79 to a ratchet wheel 80 resting upon said guidebracket. A, flanged bushing 81 is rotatably mounted upon the upright rod above said ratchet wheel, and a spring pressed pawl 82' pivoted thereto is adapted to engage the teeth of the ratchet wheel for causing rotation of the turning rack. For keeping the. flanged bushing in engagement with said guide bracket, a coiled spring 83 is interposed between the forked end 68 of the lever 69 and the bushing. To said bushing at 84 is connected one end of a belt 85, which partially winds around the same. said belt is attached to a wire rod 86, and

.the free end of this wire rod is pivotally connected to an arm of a bell crank "87,

The other end of of the disks 10 of the roller table. As soon as the turning rack is lifted clear of the disks, the sliding joint member 89 has closed up and the bell crank 87 is actuated. The bell crank pulls upon the wire rod 86, which by unwindlng the belt 85, rotates the flanged bushing 81 and together with the same the turnin rack is rotated a quarter of a revolution. pon the return movement of the control carnage, the turning rack. will drop by gravity, and one of four guide pins 90 extendin horizontally from the upright rod 65, wi enter a slot 91 in a guide plate 92 fixed to the uide bracket 77, which insures the plate being prepared for etching being left squarely upon the roller table.

Powdwm'ng chamber, Figs. 1-3.)-Arranged near the turning rack, is a chamber 93, which incloses mechanism for sprinkling powder over the surface of the plate being prepared for etching, and also mechamsm for brushing said powdered surface. The chamber preferably consists of a lower box like portion 94, having an inclined bottom 95, which slopes to a transversely extending trough 96, and a removable cover 97. Said lower portion of the chamber is supported from the top side base of the frame, and the front and rear sides thereof are provided with elongated openings 98 and 99 respectively for permitting the plate to pass through the chamber.

Powder sprmlcling mechanism, (Figs. 1719.)A tapering hopper 100 for containing the powder is supported above the trough 96 by upright brackets 101 fixed to the frame and extending into the chamber,

and its bottom is Iplrovided with a longitudinal outlet 102, w ich is closed by a corrugated roller 103 having its shaft 104 pivoted in said uprightbrackets. A circular brush 105 is arranged in 'contact with the corrugated roller for keeping the same clean, and its spindle 106 is rotatably mounted in lateral extensions 107 of the upright. brackets 101. Guide plates 108 and 109 are fixed to the hopper for directing the powder as it falls therefrom. Said corrugated roller is driven from one of the roller table shafts 9, and is adapted to be rotated for sprinkling the powder, only when the plate being prepared for etching is being carried toward the turning rack end of the roller table. This is carried out by loosely mounting a sprocket wheel 110 on the roller shaft 104, which is driven by a sprocket chain 111 passin over a sprocket wheel 112 fixed a re ler table shaft 9. A spring pawl 113 carried-by the sprocket wheel 110, is ada ted to engage the ratchet teeth 114 on the sim e of a gear 115, which is fixed to the roller shaft 104, and drive saidcorrugated roller when the rollertable shaft 9 is rotatin in 'one direction but notin the other. '1 e circular brush 105 is rotated from the roller 103 by the gear 115 meshing with a gear116 fixed to its spindle 106. Another brush 117 is arranged adjacent the powder hopper 100 for removing the surplus powder fromthe plate being prepared for etching as it travels under the same. This brush is adapted to he raised clear of the plate when the plate is travel'in under the brush on its return. Supportmg the brush 117 are a pair of arms 118, which are slidably mounted in slotted guides 119 of the bracket extensions 107, and depending from said arms are legs-120 having inturned ends 121 for cooperating with cams 122 fixed to the roller table shaft 9. Said cams are cylindrical and at one side are provided with spiral grooves 123 leading from the outer edges thereof to their centers for receiving saidinturned ends-121. Suitable fl'at springs 124 are arranged in the cams across the inner ends of the spiral grooves. When the cams 122 rotate clockwise, the inturned ends 121 rest upon the shaft 9 and the brush 117 will be held in its down position.

The moment the cams rotate in the opposite direction, said inturned ends cannot pass the free inner ends of the flat springs and will be thrown by the action of the spiral grooves to the outer edges of the cams, thereby raising the brush and holding it clear of the plate. When the cams again change their direction of rotation,.the inturned ends will enter the spiral grooves and the brush will be returned to its down position.

As the powder falls from the hop-per 100 and "also as it is brushed from the plate being prepared for etching, it runs intothe trough 96 of the chamber 93. From said trough, the powder is carried back to the I .the powder hopper, A pair of endless sprocket chains 131 pass around said sprocket wheels, and these chains are connected together at intervals by pins 132, to which are pivoted a rear edge of buckets 133. The sprocket wheels 127 are so arranged that said buckets will scrape along the bottom of the trough 96, and a guide rail 134 support ed from the chamber by brackets 135, is provided for preventing the buckets tipping forwardly as they travel above the hopper and downwardly. The sprocket chains 131 are adapted to travel in but one direction, and only when the corrugated roller 103 is rotating for sprinkling the powder.

The axle 125 is driven from the shaft 21, by means of a sprocket chain 136, which passes over a sprocket wheel 137 fixed to said shaft. This chain drives a sprocket wheel 138 loosely mounted on the aXle 125, and a sprin pawl 139, carried by this sprocket whee is adapted to engage the ratchet teeth on the side of a wheel 140 fixed to the axle, and thereby rotate the axle only when the shaft 21 is rotating in one direction.

Brushing mechanism, (Figs. 20-22.) After being powdered, the plate, on its return through the chamber 93, passes beneath a plurality of transversely moving brushes 141, carried by an endless sprocket chain 142, which travels over a pair of sprocket wheels 143 fixed to spindles 144 and 145. These spindles are rotatably mounted in standards 146 projecting) upwardly from the frame. Each of the rushes 141 is adjustably attached, as at 147, to a plate 148, which is cut out at 149 for straddling the sprocket chain, and a pair of right angle ears 150 projecting therefrom are pivotally connected to a pin 151 of the chain. It is important that the brushes move evenly over the powdered surface of the plate, and this is accomplished by providing suitable tracks 152, which are fixed to the standards 146 for supporting roller wheels 153 on the pins 151 of the sprocket chain. It will be noted that the c ain sags under its own weight, and this tends to keep the roller wheels upon the tracks. The brushes 141 always travel in the same direction across the powdered plate and incline rearwardly with relation to the movement of the chain. The edges 154 of the cut out portions of the plates 148, by engaging the sprocket chain, limit the inclination of the brushes. Motion is imparted to the spindle 144 from the shaft 21,

4 by a sprocket chain 155, which passes around a sprocket wheel 156 fast on said shaft, and over a sprocket wheel 157, loosely mounted on said spindle. The sprocket wheel 157 carries a spring pawl 158, which is adapted to engage the ratchet teeth of a wheel 159 secured to the spindle for rotating the same.

Powder baking burners and means for operating same, (Figs. 1-4 and 8, 9, 12.)The

powder is baked to the plate after leaving the chamber 93 as it travels over a plurality of gas burners 160 in the form of tubes arranged between the rows of disks 10. These tubes are bent under at 161 and terminate in acommon header 162, which is connected by a vertical pipe 163 to an elongated reservoir 164 supported by the cross pieces 31 of the frame. Gas is supplied to said reservoir lights 167 connected to the reservoir 164, and

locked in open position until the plate has passed over said burners. A lever 168, pivoted at 169 to a cross piece 170 of the frame, is adapted to force the plunger of the valve 165 inwardly, and to the upturned bifurcated free end, 171, of this lever is pivotally attached a push rod 172 having its other end slidably supported in a bearing box 173 fastened to the leg 4 of the frame. push rod is forced longitudinally to open said valve by means ofan arm 174, which is rotatably connected to the end of the carriage 51 by a flange 175, and is adapted to engage a lug 176 on the rod. A suitable spring 177 tends to press the arm 174 toward the push rod. The valve is locked open by means of a bar 178, having one end pivoted at 179 to the leg 4 of the frame, and

carrying a block 180, which is adapted to engage a collar 181, fixed to the push rod 17 2. After the arm 174 has moved said push rod to its locked position, it is disengaged from the lug 17 6 by sliding over a stationary cam plate 182 fixed to the frame, and at the proper time will raise the locking bar 178 out of engagement with the collar 181, thereby allowing the shut off valve 165 to close. The inclined free end. 183 of the locking bar permits the same to be raised and fall at the proper time.

' Cooling platform and mechanism for stopping and reversing same, (Figs. 1-3 and 5 and 1012.)-When the powder has been baked to the plate, it is carried onto the before mentioned cooling platform, which is automatically stopped, while the plate is cooled by air furnished by a blower- 184 and delivered through a pipe 185 having a nozzle 186 for directing the same against the plate and then the cooling table is caused to trave in the reverse direction. scribed, the control carriage 51 actuates the shift rod 40 formoving the clutch 26 and thereb causing the roller table and the cooling ta le to carry the plate in either direction. When the control carriage forces the shift rod to the left, the clutch 26 engages the bevel wheel 24, and a pawl 187, which is pivoted at 188 to the frame with its free end resting upon the push rod, falls into a Said the same time that the control carriage 51 is advancing and returning, a releasmg carriage 190 su ported on the threaded portion 191 of a shaft 192, which is rotatably mounted in. the bearing 60 and a bearing 193 fixed to an upright 194 of the frame, is also moving in the first direction for releasing the shift rod 40. The threaded shaft 192 is driven from the shaft by ,means of a sprocket chain 195, which ipasses over sprocket wheels 196 and 197 xcd respect1vel to said shafts. A toothed bar 198 is slida ly mounted in said releasing carriage, and when in its down position its teeth 199 are adapted to engage the threads 191 of said shaft. The upper end of the toothed bar 198 is provided with a hollow space 200, in which is rotatably mounted a roller wheel 201 for running upon a guide bar 202,which is p'ivotally connected to the'leg 4 andupri ht 194 by a pair of links 203 and 204. Tfie guide bar 202 is held in its down position by means of a locking pawl 205, which is pivoted at 206 to a piece 207 extending looking position.

from the frame. Said locking pawl is pro vided with a lateral nose 208, which is adapted to engage the edge of a recess 209 in the upper edge of the guide bar 202. A spring 210 tends to keep the pawl 205 in The releasing carriage 190 is caused to move in one direction by the rotation of the threaded shaft 192, and at the propertime, an arm 211 carried by the carriage strikes the pawl 187 and forces .it out of engagement with the shoulder of the notch 189 of the shift rod-40'. Upon being released, the shift rod is forced to the right 26 brought into engagement with the bevel clutch 23. Both the roller table and the cooling platform now begin to travel in the 0pposite direction from that before they came to a standstill. At the moment the arm 211 strikes the pawl 187, a finger 212 projecting from the releasing carriage 190 engages the curved ed e 213 of the locking pawl'205, and forces it laterally out of engagement with the guide bar 202, which is thrown up by the tension of a coiled spring 214 connected to the link 204 and carriage 190. This raises the toothed bar 198 out of engagement with the shaft 192, and the carriage is drawn back to a stop 215 on the shaft by the action of the coiled spring 214. The guide bar 202 is forced to its down position by the control carriage 51. Upon its return movement, the control carriage'actuates a push bar 216 pivotally connected at 217 to the link 203 and having its free end slidably supported in the bifurcated end of an arm 218 projecting upwardly from the carriage. In order that the uide bar will not be forced down too suddinly, a coiled spring 219 is arranged on the push bar with one end abuttin a collar. 220 thereon, and the arm 218 is a apted to etching,

act against the other end of the spring. Said collar is adjustably fixed to the push bar by a screw 221, so thatit may be set to a suitable position for obtaining smooth actionof the guide bar.

Mechanism,- for stopping the machine, Figs. 3 and 5- 7.)As it is necessary to powder the plate four times in preparing it for it must travel back and forth upon the roller table that number of times. When the plate has been carried back and forth four times the roller table is stopped, by mechanism operated from the control carriage 51, which throws a switch for stopping i 227 of a switch 228, closes the switch andstarts the motor 33. A spring 229 tends to draw the lever 227 toward the leg 4 and close the switch. Said switch is fixed to a lower.

sidebar of the frame, and is connected to a suitable electric circuit and to the motor in the usual manner. The moment the switch is closed, the notched end 230 of a weighted lever member 231 pivoted at 232 to the leg 4, engages a nib piece 233, which is fixed to the switch lever 227, and locks the lever against movement. Before the bar 222 can slide for the purpose of closing the swltch, it Is necessary to release it by raising a locking dog 234, which is pivoted to v the leg 4, and is adapted to engage the ratchet teeth 223, and also to raise a push pawl 235, which is pivotally connected to a; depending lever 236 having its upper end plvoted to a top side bar of the frame. This is done by shifting a handle 237 fixed to a rod 238, which is rotatably supported by the legs 3 and 4 of te' frame, and from said rod project arms 239, to which said latch and pawl are connected by chains indicated by 240.v From the depending lever 236' projects a pin 241, which is adapted to be engaged by the arm 174 of the control carriage 51 for pushing the lever to the right. A guide pin 242, projecting from the leg 4. passes freely through the lever at 243, and on this guide pin between the leg and lever is a coiled spring 244 for forcing the lever to the left. A nut 245 on the guide pin limits the movement of the lever. Each time the control carriage 51 advances to the left, the coiled spring 244 forces the lever236 in that direction, and when it returns, its arm 174 engages the pin 241 and forces the lever to the right. This causes the push pawl 235 to move the bar one tooth forward, and the locking dog 234 wilprevent it moving backward. Upon moving the bar 222 the distance of four teeth, a trolley wheel 246 carried by the bar will press the curved end 247 of the lever 231 downwardly and thus disengage its other end from the nib piece 233. The switch lever 227 will then e thrown open by the action of the spring 229, and the machine stopped.

The operation follows: The plate to be prepared for etching is laid s uarely upon the cooling platform 14. Be ore startmg the machine, the control carriage 51 and all of the other parts are in the positions best shown as a whole in Fig. 3. By shifting the handle 237, the locking dog 234 and push pawl 235 are disengaged from the ratchet teeth 223 and 224 respectively of the bar 222, and the coiled spring 225 forces said the lever 227, closes the switch 228, thereby starting the electric motor 33. Power is transmitted from the motor-to theshaft 32, Fig. 5, thence to the shaft 30, and through the inclined shaft 27 to the bevel wheels 23 and 24. As the clutch 26 engages the bevel wheel 23, the shaft 21 is rotatedclockwise, and motion is transmitted by the pinion 20 on this shaft to the gear wheel 19, which causes rotation of the longitudinal shaft 17 (Fig. 3). The bevel gears 16 on this shaft drive the bevel gears 15, and thus rotate all of the shafts 9 carrying the disks 10 and also the shafts 11 of the cooling table, in the proper direction for causing the aforesaid plate being prepared for etching to travel toward the other or turning rack end' of the roller table. 1

When the shafts 9 are rotating as just stated, motion is transmitted through the sprocket chain 111 (Fig. 18) and by the action of the spring pawl 113, to the corrugated roller 103 for causing the powder to fall from the hopper 100. The circular brush 105 is rotated from the action of the corrugated roller by means of the meshing gears 115 and 116, and the brush 117 is forced downwardly and held in its down ,position by the spiral groove cams 122. As the plate travels under the hopper, the powder falls thereon, and as it passed under the brush 117, the surplus powder is removed from the plate.

While the plate isbeing carried toward the turning rack end of the roller table, the shaft 21 is driving the worm shaft 59, through the agency of the Pinion 62 and the gear 63, so that the control carriage 51 is caused to advance by the rotation of said worm shaft. The arm 52 of the control carriage compresses the coiled spring 45;, and when the locking lever 47 1s disengaged from the collar 43 of the shift rod 40 by'the roller 56 striking the cams 58, said compressed coiled spring forces the shift rod-to the left. The clutch 26 being forced into engagement with the bevel wheel 24 causes the shaft 21 to revolve in the opposite direction and thereby reverse the travel of the roller table. The block 49 of the locking lever 46,

riage 51 (Figs. 6 and 7), in its advancing movement, by forcing the sleeve 7 6- alon the worm shaft, actuates the fulcrumed ever 69 and thereby raises the turning rack clear of the disks 10 and with it the plate. As the control carriage continues to advance, the sliding joint member 89 is closed up and the T bell crank 87 actuated. This pulls upon the bar to the left (Figs. 6 and 7). The pin- 226 carried by this bar being forced against wire rod 86, and the unwinding of the belt 85 rotates the flanged bushing 81, thus causing the pawl 82 to rotate the turning rack a quarterturn. Upon the reversing of the rotation of the shaft 21, the rotation of the worm shaft 59 is reversed and the control carriage forced to return to its original powhich have been at rest, begin to move due to the action of the spring pawl 158 (Fig. 21) driving the spindle 144, and thereby moving the sprocket chain 142 carrying the brushes. As the'powder covered plate asses under these transversely moving brus 1 es, it is brushed in one direction.

As soon as the plate has been brushed, the

arm 174 (Figs. 8, 9 and 12) of the control carriage 51 engage the lug 176, and forces the push rod 172 to the right. This opens the valve 165, and gas is admitted to the burners 160, which become ignited from the pilotlights 167. When the push rod 172 is actuated, the block 180 of thelocking bar .17 8 engages the collar 181, and the valve 165.

is held open. As the powder covered plate passes over the ignited ga burners, the powder is baked thereto. Just as soon as the plate is carried past the last burner, the

arm 17 4 of the control carriage, having been thrown up b slidin on the cam plate 182, is disengage from t e lug 176, and at the proper tlme forces the locking bar 178 out of engagement with the collar 181 of the push rod. Upon releasing the push rod the valve 165 automatically closes and gas is shut off from the burners.

After the powder has been baked to the 7 plate, it passes onto the moving platform 14 (Fig. 3) under the air blast from the nopzle 186, and upon reaching a central position thereon, the platform stops for allowing the plate reaches the center of the platform, the

roller 56, carried by the arm 54 of the control carriage, strikes the cam 57 and forces the locking lever 46 to release the shift rod. Upon being released, the shift rod is forced longitudinally, by the action of the com-' pressed sprin 44, until the shoulder of its notch 189 stri es the pawl 187. This brings the clutch 26 to its central or neutral position between the bevel wheels 23 and 24, and

the shaft 21 not being rotated, the roller" table and also the platform come'to a standstill. When the plate has been subjected to the air blast a sufiiclent len th of time for being cooled, the awl 187 1s lifted out of engagement with t 1e shoulder of the notch 189 of the shift rod 40, by the arm 211 of the releasing carriage 190, and the shift rod is forced longitudinally by the compressed coiled spring 44 to bring the clutch 26 into engagement with the bevel wheel 23. This At the proper time, said guide bar, which causes the shaft 21 to be driven in the direction first mentioned, and the cooling platform and also the roller table to travel in the opposite direction from that before they came to a standstill. The plate therefore is carried again to the other or turning rack end of the roller table. Said releasing carriage 190 is advanced by the rotation of the threaded shaft 192, which is driven continuously in one direction from the shaft 30 through the medium of the sprocket chain 195 (Fig. 5). The guide bar 202 being in its down position, allows the teeth 199 of the toothed bar 198 to engage the threads of the shaft 192 and the carriage is thus advanced.

has been held in its down osition by the locking awl 205, is release by the finger 212 striking the curved edge 213 of the looking pawl and forcing it out of engagement with the guide bar. As soon as released the guide bar is thrown up by the action of the coiled spring 214, the toothed bar 198 is thereby lifted out of engagement with the threaded shaft 192, and said coiled spring now serves to draw the releasing carriage back to the stop 215. Said guide bar is gently forced to its down or original position by thc'arm 218 of the control carriage 51, upon its return movement, pressing against the coiled spring 219 on the push bar 216. Due to the action of the spring 210, the nose 208 of the locking pawl 205 enters the recess 209, and the uide bar is held in its down position as be ore.-

Upon startin the machine by shifting the handle 237, and thus allowin the bar 222 (Figs. 6 and 7) to be forced ongitudinally by the coiled spring 225, the locking dog 234 will rest against the shoulder of the last ratchet tooth 223 and the push pawl 235 will rest upon the next to the last ratchet tooth 224.

As the control carriage 51 advances, its 'arm' 174, which has been engaging the pin 241 carried bythe depending lever 236, permits the lever to swin in the same direction due to the action of t e coiled spring'244 on the guide pin 242. This allows the push 'pawl 235 to fall back of the shoulder of the last ratchet tooth 224. When the control carriage returns, its arm 174, by engaging said pm 241, will actuate the ever and cause the push pawl to force the bar 222 one tooth to the right, and the locking dog 234 will drop back of the second ratchet tooth 223 thus holding the bar against backward movement. Each time the control carriage 51 advances and returns, the bar 222 is moved one tooth, and when it has moved the distance of four. teeth, the trolley wheel 246, by forcing the curved end 247 of the lever member 231 downwardly, disengages its notched end 230 from the nib piece 233, and the switch 228 is opened by the action of the coiled spring 229. The machine is thus automatically stopped, when the late is upon the cooling platform. When t e plate being prepared for etching has been carried four times back and forth upon the roller table, each time oing through the operations described, it has been powdered four times, brushed in four different directions, the powder baked to the plate, and the plate cooled after each brushing.

for causing the powder to fall upon the plate as it travels along, transversely traveling brushes for brushing the powder in one direction over the surface of the plate, and

.- -'Having fully described my invention, what means for baking the powder 'to the plate. I

3. In a plate. powdering machine, means for carrying a plate, means for holding powder above the travel of the plate, means for causing the powder to fall upon the plate as it travels along, transversely traveling brushes for brushing the powder in-one direction over the surface of the plate, means for baking the powder to the plate, and means for cooling the plate.

4c. In a plate powdering machine, means for carrying a plate, means for holding powder above the travel of the plate, means for causing the powder to fall upon the plate as it travels along, means for brushing the powder in one direction over the surface of the plate, means for baking the powder to the plate, means for cooling the plate, andmeans for automatically stopping the machine.

5. In a plate powdering machine, means for carrying a plate, means for holding powder above the travel of the plate, means for causing the powder to fall upon the plate as it travels along, means for brushing the owder over the surface of the plate, means or baking the powder to the plate,

means for cooling the plate, means for auto matically stopping the means for carrying. a plate, and means for automatically start-- ing the means for carrying ing stopped.

6. In a plate powdering machine, means for carrying a plate, means for holding powder above the travel of the" plate, means for causing the powder to fall upon the a plate after beplate as it travels along, means for brushing the powder over the surface of the plate. means for baking the powder to the plate, means for cooling the plate, means for automatically stopping the means for carrying aplate during the cooling of the plate,- means for starting the means for carrying a plate after being stopped, and means for reversing the travel of the means for carryin the plate after the stopping of the same.

In a plate powdering machine, means for carrying a plate, means for holding powder above the travel of the plate, means for causing the powder to fall upon the plate as it travels along, means for brushing the powder over the surface of the plate, means for baking the powder to the plate, means for cooling the plate, means for automatically stopping the means for carrying a plate, means for automatically starting the means for carrying a plate after being stopped, means for automatically reversing the travel of the means for carrying the plate after the stopping of the same, and means for turning the plate a part of a revolution.

8. In a plate powdering machine, the combination of a roller table for carrying a plate, means for .driving the roller table, a hopper for holding powder arranged above the roller table, means for causing the powder to fall upon the plate, a vertically movable brush" adapted to remove the surpowder to the plate.

memos combination a roller table for carrying a plate, means for driving the roller table, a hopper for holding powder arranged above the roller table, means for causmg hopper for holding powder arranged above the roller table, means for causing the powder to fall upon the plate, a vertically movable brush adapted to remove the surplus powder from the plate, means for movng saidbrush, transversely, moving brushes for brushing. the powder over the surface of the plate, and means for baking the 11. In a plate powdering machine, the

combination of a roller table for carrying a plate, meansfor driving the roller table, a

the roller table, means for causing the powder to fall upon the plate, a vertically movable brush adapted to remove the surplus powder from the plate, means for moving said brush, transversely moving brushes for brushing 'the powder over the surface of the plate,

plate, burners for baking the powder to'the' plate, and an air blast for cooling the plate.

13. In a plate powdering machine, the combination of a roller table for carrying a plate, means for drivin the roller table, a hopper for holding pow er arranged above the roller table, means for causing the powder to fall upon the plate, a vertically movable brush adapted to remove the surplus powder from the plate, means for moving said brush, transversely moving brushes for brushing the powder over the surface of the plate, means for reversing the travel of the roller table, and means for turning the plate so that said transversely moving brushes will brush it in different directions.

14. In a plate powdering machine, the

combination of a roller table for carrying a plate, means for driving the roller table,

hopper for holding powder arranged above roller table, means for turning the plate so a owder hopper arrange ta le, transversely movable brushes for h as i a plate, means for drivin the roller table,

J as

combination of ,aroller tab e forcarrying that said transversely moving brushes will brush it in different directions, means for baking the powder to the plate after each transverse brushin and means for cooling the plate after eac baking of the powder thereto.

. .15. In a plate powderin machine, the

combination of a roller tab e for carrying the roller table,

a plate, means for driving v above the roller brushin the plate, means for reversingthe travel o the roller table, means for causing powder to fall from said hopper when the plate is being carried in one 'direct1on,and means for operating said brushes. when the plate is being carried in one direction.

16. In a plate powdering' machine, the combination of a roller tab for carrying a owder hopper arrange above the roller ta le, transversely movable brushes for brushing the plate, means for reversing the travel of the roller table, means for causing powder to fall from said hopper when the plate is being carried in one direction, means for operatin said brushes when the late is bein 'carrie for aking the powder to the plate after being brushed, means for operating the gas burners, means for shutting off. the gas burners, and means for cooling the plate after the powder has been baked thereto.

17. Ina plate powdermg machine, the

combination of a roller table for carryinga plate, means for driving the roller table,

a owder hopper arranged above the roller ta le, transversely movable brushes -for passing under the hopper, means for revere-'- ing the travel of the roller table, and meansfor operating said brushes after the reversbrushing the plate, means for causing powder to fall from said he per when the plate is first passing thereun er, means forturning the plate a part of a revolution after ing of the travel of'the roller table; a I

18.- In a plate powderin machine, the

a platefmeans for driving the roller table,

' a -powderhopperarranged above the roller ta le, transversely movable brushes for brushing the"plate, means for causing pow-' der to fallfrom said hopper when the plate is first passing thereunder, means for turnin'g the-plate a part of a revolution after in one direction, gas urners.

passing under the hopper, means for reversmg the travel of the roller table, means for operating said brushes after the reversing of the travel of the roller table, means for baking the powder to the plate after being brushed, and'means for coolin the plate after the baking of the wder t ereto.

19. In a plate pow ering machine, the combination of a roller table for carrying a plate, means for driving the roller table, a powder hopper arranged above the roller table, transversely movable brushes for brushing the plate, means for causing powder to fall from said hopper when the plate is first passing thereunder, means for turning the plate a partof a revolution after assing under the hopper, means for reversing the travel of the roller table, means for operating said. brushes after the reversing of the travel of the roller table, means for baking the powder to the plate after being brushed, a latform for receiving the plate after the ba ing of the powder thereto, and

an air blast for cooling the plate when upon said platform.

20. In a plate powdering machine, the combination of a roller table for carrying a plate, means for driving the. roller table, a owder hopper arranged above the roller ta le, transversely movable brushes for brushing-the plate, means for causing powder to fall from said ho per when .the plate is first passing thereun er, means for turning the plate' a part of a revolution after passing under-the hopper, means for reversmg the travel of the roller table, means for operating said brushes after the reversing of the travel of the roller table, means for baking the powder to the plate after being brushed, a traveling latform for receiving .the plate after the aking of the powder thereto, means for stopping the platform,

means for cooling the plate when upon the platform, and means for reversing the travel of the platform. p 21. Inaplate powdering machine, the combination of a roller table for carrying a plate, means for driving the roller table,- a powder hopper arranged above the roller I table, transversely movable brushes "for brushing the late, means for causing powder to fall om said hopper when the plate is first assing thereunder turning the p ate a part of a revol passing under the hopper, means for reversing the travel of the roller table, means for operating saidbrushes after the reversing of the travel of the-roller table, means for baking the powder to the plate after bemeans for ution after ing brushed, a travelin platform for receiv- I reversing the travel of 35. combination of a roller table for carrying.

the mac ine to a standstill after the reversing of the travel of the roller table and sai platform several times.

22. In a plate. powdering machine, the combination of a roller table for carrying a plate, means for drivin the roller table, a owder hopper arrange above the roller ta le, transversely movable brushes for brushing the plate, clutch mechanism for reversing the travel of the roller table, and

means for operatin the clutch mechanism.

23. In a plate pow ering machine, the combination of a roller.table for carrying a plate, means for driving the rolle'n, table, a powder hopper arranged above the roller table, transversely movable brushes for brushing the plate, clutch mechanism for reversing the travel of the roller table, a rotatable worm shaft, and a control carnage mounted on the worm shaft for operating the clutch mechanism.

'24. In a plate powdering machine, the combination of a roller table for carryingfla a e,

a plate, means for driving the roller table, a powder hopper arranged above the roller table, clutch mechanism for reversing the travel of the roller table, a control carriage for operating the clutch mechanism, transversely movlng brushes for brushing the plate after the reversing of the travel of the table,.clutc roller table, burners for baking the powder to'the plate, the burners'being o erated by the control carriage, and means or cooling the plate after the baking of the powder thereto. I

26. In a plate powdering machine, the combination of a roller table for carrying a plate, means for driving the roller table, a powder ho 'per arranged above the roller mechanism for reversingthe travel of the roller table, a control carriage for operating the clutch mechanism, transversely moving brushes for brushing. the plate after the reversing of the travel of the I roller table, burners for baking the powder to the plate, the burners being operated by the control carriage, a traveling platform for receivingthe plate after the baking of.

' the powder thereto, means for stopping the platform with the. plate thereon, means for cooling the plate whemupon the platform,

lplatform, and means for bringing the baking meme and means for reversing the travel of said platform.

- 27. In a plate powdering machine, the combination of a roller table for carrying a plate, means for drivin the roller table, a owder hopper arranged ta le, clutch mechanism for reversing the travel of the roller table, a control carriage for operatin the clutch mechanism, transversely moving brushes for brushing the plate after the reversing of the travel of the roller table, burners for baking the powder to the plate, the burners being operated by the control carriage, a traveling latform for receiving the plate after the aking of the owder thereto, means for stopping the p atform with the plate thereon,

-means for cooling the plate when upon the platform, stopping mechanism adapted to ring said rol er table and said platform to a standstill after the travel thereof has been reversed several times, and the stoppin mechanism being operated by said contro carria e. t

28. n a plate powdering machine, the combination of a roller table for carrying a plate, means for driving the roller table. a powder hopper arranged above the roller table, a rack for turning the plate a uarter of a revolution, clutch mechanism or reversing the travel of the roller table, a control carriage for operating the rack and the clutch mechanism, transversely moving brushes for brushing the plate after the reversing ofthe travel of the roller table, and means operated by the control carriage for baking the powder to the plate after being brushed.

- 29. In a plate powdering machine, the combination ofa roller table for carrying a plate, means for driving the roller table, a powder hopper arranged above the roller table, a rack for turning the plate a quarter of a revolution, clutch mechanism for reversing the travel of the roller table, a control carriage for operating the rack and the clutch mechanism, transversely moving brushes for brushing the plate after the reversing of the travel of the roller table, and

.burners for baking the powder to the plate after being brushed, the burners being operated by the control carriage, a traveling platform for receiving the plate after the of the powder thereto, means for stopping the platform -with the plate thereon,.means for cooling the plate when upon the platform, stopping mechanism adapted to bring said roller tableand said platform to a standstill after, the. travel thereof has been reversed four times, and

the stopping mechanism being operated by said control carriage. 30. In a plate powdering machine, the combination of a 'roller table for carrying above the roller.

a plate, means for driving the roller table includin clutch reversing mechanism, a powder dropper arranged above the roller table, transversely movable brushes for brushing the plate, the brushes being actuated from the means for driving the roller table, burners for baking powder to the plate, a worm shaft, the worm shaft being rotated by the means for driving the roller table, a control carriage actuated by the worm shaft, said clutch reversing mechanism and said burnersbeing operated by the control carri e.

31. In a p ate powderin machine, the combination of a roller tab e for carrying a plate, means for driving the roller table includingl clutch reversing mechanism a powder v table, transversely movable brushes for pper arranged above the re er brushing the plate, the brushes being actuated from the means for driving the roller table, burners for baking powder to the plate, a traveling platform for receiving the plate, the latform being actuated by the means for riving the roller table, means for cooling the late when u on the platform, a worm shag, the worm s aft being rotated by the means for driving the roller table, a control carriage actuated b the worm shaft said clutch reversing mee anism and said burners being operated by the control carriage. a

32. In a plate powdering machine, the combination of a roller table for carr m a plate, means for driving the roller ta le-meluding clutch reversin mechanism, a pow: der hopper arranged a ove the roller table, transversely movable brushes for brushing the plate, the brushes being actuated from the means for driving the roller table; a rack for turning the plate a part of a revolution, burners for baking powder to the plate, a traveling platform for receiving the a wormshaft, the worms f at - plate, the

latform being actuated by the means for riving the roller table, means for cooling the plate when upon the platform,

aft bein rotated by'the means for driving the re er table, a control carriage actuated by the worm shaft, said rack, said clutch reversing mech-' anism and said burners being operated by the control carriage.

brushing the plate, the brushes being actuated from the means for driving the roller table, a rack for turning the plate a part of a revolution, burners for baking powder to the plate, a traveling platform for receiving the plate, the platform being actuated by the the control carriage.

In a plate powdering machine,- the combination of a roller table for carr ing ameans for driving the roller table, means for coolmg the plate when upon the platform,

means for stopping the v.travel of the plat- "by the control carriage.

34. In a plate powdering machine, the combination of a roller table for carrying a plate, means for driving the roller table ineluding clutch reversing mechanism, a powder hopper arranged a ove the roller table, transversely movable brushes for brushing the plate, the brushes being actuated from the-means for driving the roller table, a rack for turning the plate a part of a revolution, burners for baking powder to the plate, a traveling platform for receiving the plate, the platform being actuated by the means for driving the roller table, means for cooling the plate when upon the platform, means for sto ping the travel of the platform, means or bringing the machine to a standstill after the reversing of the travel' of the roller table several times, a worm shaft, the worm shaft being rotated by the means for drivin the roller table, a control carriage actuate rack, said clutch reversing mechanism, said burners, and said means for bringing the machine to a standstill, being operated by 35. In a plate powdering machine, the combination of a roller table for carr ing a plate, means for driving the roller ta la including clutch reversin mechanism, a powder-hopper arranged a ove the roller table, transversely movable brushes for brushing the plate, the brushes being actuated from the means for driving the roller table, a worm shaft, the worm shaft being rotated by the worm shaft, said by the means for drivin the roller table, a

control carriage mounte upon and actuated by the worm shaft, said clutch reversing mechanism being'operated' by the control carriage, locking levers for holding the clutch reversingmechanism in either driving position, and the locking levers being disengaged by the control carriage.

36. In a plate powdering machine, the

combination of a roller table for carryin a plate, means for driving the roller table 1neluding clutch reversing mechanism, a pow. der hopper arranged a ove the roller table, transversely movable brushes for brushing the plate, the brushes being actuated from the means for driving the rollertable, a worm shaft, the worm shaft being rotated by the means for driving the. roller table, a control carriage mounted upon and actuated by the worm shaft, said clutch reversin mechanism being operated by the coutroq carriage, locking levers for holding the clutch reversing mechanism in either driving position, the locking levers being disenga ed by the control carriage, means for ho din the clutch reversing mechanism in neutral position, and means for releasing said last means, K

37. In a plate powdering machlne, the combination of a roller table for car mg a plate, means for driving the roller ta la including clutch reversin mechanism, a powder hopper arranged a ove the roller table,

transversely movable brushes for brushing the plate, the brushes being actuated from the means for driving the roller table, a worm shaft,'the worm shaft being rotated by the means for drivin the roller table, a control carriage mounte upon and actuated by the worm shaft, said clutch reversm mechanism being operated by the contro carriage, locking levers for holding, the clutch reversing mechanism in either driving position, the locking levers being disengaged by the control carriage, said clutch reversing mechanism including a shlft rod,

a pawl for limiting the movement of the shift rod to hold the clutch reversing mechanism in' neutral position and releasing means for disengaging said pawl.

38. In a plate powdering machine, the

' combination of a roller table for carrying a plate, means for driving the roller ta 1e mcluding clutch reversin mechanism, a powder hopper arranged'a ove the roller table, transversely movable brushes for brushing the plate, the brushes being actuated from the means for driving the roller table, a

worm shaft, the worm shaft being rotated by the means for driving the roller table, a'conu trol carriage mount'e pon and actuated by the worm shaft, said clutch reversing mechanism being operated by the control carriage, a turning rack, the turning, rack being below the top of the roller table, and means operated by the control carriage for lifting the turning rack above the surface of the roller and rotating it a art of a revolution. 39. In a plate pow ering machine, the combination of a roller table for 'carr in a plate, means for driving the roller ta 1e mcluding clutch reversin mechanism, a powder hopper arranged a ove the roller table, transversely movable brushes for brushing the plate,'the brushes being actuated from the roller table, a

" ion by said control tease the combination of a roller table for carrying-a plate, means for driving the roller table 1ncluding clutch reversing mechanism, a pow-' der hopper'arranged above the roller table, transversely movable brushes for brushingthe plate, the brushes being actuated from the means for driving the roller table, a worm shaft, the worm shaft being rotated by the means for driving the roller table, a

- control carriage mounted upon and actuated by the worm shaft, said clutch reversing mechanism being operated by the control carriage, burners for baking powder to the plate, a valve for admitting gas to the burners, a push rod for opening the valve,'the push rod having a lug, an arm pivoted to said control carriage for engaging the lug to move the push rod, a locking bar forjhold ing the valve open, and a cam plate for throwing said arm out of engagement with the lug and for causing the arm to force the locking bar to release the push rod.

41. In a plate powdering machine, the combination of a roller table for carrying a plate, means for driving the roller table including clutch reversing mechanism, a powder hopper arranged above the roller table, transversely brushing the plate, the brushes being actuated from the means for driving the roller table, a Worm shaft, the worm shaft being. rotated by the means for driving the roller table, a control carriage mounted upon and actuated by the worm shaft, said clutch reversmg mechanism being operated by the control carriage, locking levers for holding the clutch reversing mechanism in either drlvlng position, the locking levers being disengaged by the control carriage, sald clutch reversing mechanism including a shift rod, a pawl for limiting the movement of the shift rod to hold the clutch reversing mechanism in neutral position, a threaded shaft, the threaded shaft being rotated in one direction from the means for driving the roller table, a releasing carriage loosely mounted upon thethreaded shaft, a toothed bar slidably mounted in the releasing carriage, a guide'bar, the guide bar being pivoted to links, the toothed bar having a recess for receiving the guide bar, an arm projectin from thereleasing carriage for forcing sai pawl upwardly, a spring for throwin the, guide bar upwardly and for pulling t e releasing carria e back to its original position, the guide bar movable brushes for p ing forced to its down posicarriage, a pawl for re- 1 0 plate, means for driving the roller table 1n-' oluding clutch reversin mechanism, a powder hopper arranged a ve the roller table,

transversely movable brushes for brushing the plate, the brushes being actuated from the means for driving the roller table, a worm shaft, the worm shaft being rotated by the means for driving the roller table, a control carriage mounted upon and actuated by the worm shaft, said clutch reversing,

mechanism being operated by the control carriage, the means for driving the roller table including a motor, a switch for operating the/motor, a slidably mounted bar, a spring for forcing the bar in one direction to close the switch, a spring tendin to'open the switch, a pivoted pawl for he ding the switch in open position, said bar having two sets of ratchet teeth, a dog adapted toengage the teeth of one set, a push pawladapt ed to enga e the teeth of the other set, the

- push pawl eing pivoted to a pivotally su ported lever, the lever being actuated by said control carriage each time it returns to its original position for forcing said bar a distance of one tooth, and a roller carried by said bar for actuating said pivoted pawl to release the switch lever when the bar has moved the distance of each set of teeth.

43. In a plate powdering machine, the combination of a roller table for carrying a plate, means for driving the-roller table ineluding clutch reversin mechanism, a powder hopper arranged a ove the roller table, a corrugated roller at the outlet of the powder hopper, the corrugated. roller being driven from the roller table when it travels in one direction, a round brush in contact with the corru ated roller, the round brush being rotated from the corrugated roller, a vertically movable brush, actuated from the roller table, the last brush being held in down-position when the roller table is'traveling in one direction and forced upwardly ,when traveling in the other direction, transversely movable brushes for brushing the plate, and the last mentioned brushes being actuated from the means for driving-the roller table when the roller table is traveling in one direction.

44. In a platepowdering machine, the combination of a roller table for carrying a plate, means for driving the roller table including clutch reversin mechanism, a powder hopper arranged a ve the roller table, a sprocket wheel at each side of the roller table, a sprocket chain passing around the sprocket wheels, brushes carried by the sprocket chain for brushing the plate, guide rails, roller wheels for supporting the brushesupon the rails, and one of the said "sprocket lwheels being driven from the means for driving the roller table when the roller table is traveling in one direction.

In testimony whereof I afiix my signature.

WILLIAM J. LOGAN.

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