US2462848A - Paint spraying machine - Google Patents

Description

March l, 1949.

l. P. DENYssEN ETAL. 2,462,848

PAINT `SPRAYING MACHINE 5 Sheets-Sheet 1 Filed Feb. 19, 1945 l l E l l 1 March 1, 1949. l. P. DENYssEN ET AL' l 2,462,848

PAINT SPRAYING MACHINE Filed Feb. 19, 1945 5 Sheets-Sheet 2 March 1, 1949. 1. P. DENYssEN ET A1.

PAINT SPRAYING MACHINE 5 sheets-sheet s Filed Feb. 19, 1945 Alma.. y

March 1, 1949. 1. P. DENYSSEN ETAL PAINT SPRAYING `MACHINE 5 Sheets-Sheet 4 Filed Feb. 19, 1945 March 1, 1949. l. P. DENYssEN ETAL .2,462,848

PAINT SPRAYING MACHINE Filed Feb. 19, 1945 5 Sheets-Sheet 5 D I. W

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I N l \m I N e WS Patented Mar. 1, 1949 UNITED STATES PATENT FFICE BANT SPRAYING MACHINE Application February 19, 1945, Serial No. 578,736

14 Claims. (Cl. 91-45) This invention relates to an apparatus or machine for spraying a coating of paint in a definite manner over metal strips having preformed operations thereon for the purpose of securing tions for use in dry rectiers.

rial.

current characteristic.

very desirable.

cation purposes.

manner.

specification which follows:

spring clips.

2 drying paint spray to the strips, which spray also passes over the masking tape.

After passing the spraying device, the shields are automatically moved back to normal posilisa definite parts defined by said preformed opera- 5 tion and the masking tape is withdrawn from its position of engagement with the strips, the

Our invention is directed to the treatment of strips passing on and being automatically remetal strips which have been previously operated leased from their secured position for removal on to define small discs which, after passing from the wheel. Our invention is depicted in through our apparatus, are to be subsequently vthe following drawings, wherein: blanked out of the strip, the entire strip on the Figure l iS a Dien View On a much reduced opposite side on which the discs are preformed scale of the aDperetuS. being covered with a suitable rectifying mate- Figure 2 iS a Side View Of Figure l 0n the line 2 2, certain parts of the frame being shown in The discs are actually larger than necessary Sectionfor mechanical reasons, and since the discs are Figure 3 iS e Side View O e einen DOltiOn 0n un to be used for instrument rectifiers and carry 'emerged Seele 0f Ceiiain 0f the DalS Shown in a very small current, we have found it very de- Figur e 2- srable to make the active surface on the discs Figure 4 iS e Section approximately 0n the iiiie a small proportion of the total area of the disc. ii-4 0f Figure 3, Showing the means for holding This is desirable because of the fact that the the metal S'iip in DOSitiOn 0n the periphery 0f larger the area of the disc, the greater the reti'le wheel and a lUOTtOn 0i the Silieieiing Ineens verse current characteristic of the rectifier and in fuii iineS in Shieiding POSiiiOn, being heid there this reverse-current characteristic should be kept b3 en Opere/Ging Cein- The figure 21150 SnOWS the as low as possible as compared with the forwardshielding means in dotted lines in non-shielding Also, it is desired that llOSitiOnall of the discs have uniform characteristics, Figure 5 iS u View 0f the left-hand end O Figand consequently a uniform masking system for ure 4 without the shield, showing the automatic the actual contact areas of the rectifier discs is ineens f01` Separating the DeTtS which 106k the strip to the periphery of the wheel.

It is therefore the principal object of our in- Figure 6 is a pian View 0f that part of the anvention to provide an apparatus for covering the DereftuS used fOr drawing the masking material strips carrying the rectifier discs with a suitable through the ineeninepaint so that only a small central transverse Figule 7 iS en enlarged View 0f el Dertien Of area across the discs will be exposed for recti- Figure 6, with Celtain PENS removed Figure 8 is an enlarged, part-elevational and Another object of our invention is to provide part-Sectional View on the line 8-8 of Figure 7. a machine or apparatus which will do the cover- Figure 9 iS a perspective View on an enlarged ing or masking of the strip in an expeditious Scale from the showing of Figure 2 of one of the shielding members.

Another object of our invention is to provide Figure l0 iS a Pian View 0f a SeCi'liOn 0f the an apparatus for attaining the principal object wheel rim ShOwing one of the 4guard members 01c of the invention in a semi-automatic manner. Figure 9 in guarding DOSii'fiOn- These and other objects will appear from the Figure l1 iS a Dian View 0n a Somewhat reduced scale of one of the strips carrying the current- In general, the strips are of flexible material rectifying materiel after it iS DeSSed through the and are manually applied to the rim of a large machine depicted in the DreViOuS figuresrotatable wheel, being held thereto by suitable Referring now to the drawings, wherein like As the wheel revolves, a masking numbers refer to corresponding parts, tape from a feed roll is passed over rollers framework which, as shown in Figure 2, is preferagainst the central portion of the strips, and the ably made triangular in cross-section. The frame parts which act to hold the strips to the rim of i carries bearing supports 2 and 3 for supporting the wheel are automatically covered by shields a shaft 4 which is driven in any satisfactory manner as by a sprocket wheel 5 connected by a just prior to the application of a thin, rapidchain Si to a driving pinion 1 operated by a suitable source of power such as an electric motor 8.

On the outer end of the shaft 4, is mounted a wheel 9, this wheel 9 being mounted parallel with the hypotenuse of the triangular frame. Since the wheel has a diameter of between five and six feet, this method of mounting the wheel, as shown in Figure 2, saves considerable floor space. The wheel 9 has a rim I5 on which are arcuately mounted a plurality of engagement clips II and i2. Each of these clips is fastened in any suitable manner as by rivets i3 to a spring lli fastened in any satisfactory manner as by screws or studs l5 to the rim I5.

The clips I2 have notches I5 therein to engage the edge of the metal strip I1 which has been preformed and which is to be further operated on by the present machine. The strip I1 is shown in Figure 1l, andby way of illustration and not of limitation, is approximately eleven inches long and one-half inch wide, and one thirtysecond inch thick, and is provided with two groups of partially punched discs I8, ten in number for each group. In addition, the strip is provided with holes i9, 2i), 2| and 22, and notches 23 and 2li. Furthermore, one side of the strip before it comes to the present machine has a side opposite the partially punched disc covered with a thin coating of rectifying material such as selenium.

Certain of the holes |9-22, although all may not be used, are for the purpose of engaging the ends of studs 25 which are adjustably positioned in the peripheral edge of the rim I l! whereby they may be adjusted so their projecting ends will just about come through the masking tape.

With this construction, an operator, positioned at the high side of the wheel 9, passes one of the strips I1 between the inside tapered surfaces of the clips il and I2 and over the endsof two of the spaced studs 25, which ends are adapted to engage the holes i9 and 22 at opposite ends of the strips, and one of the intermediate holes 20 or 2|, it not being necessary t0 have a stud for both of these holes which, together with the other holes, are used for other purposes in connection with the strip after it leaves this particular machine. The location of the strips as they are mounted on the wheel is clearly shown in Figure 1.

Positioned adjacent the edge of the wheel, as shown in Figure l, is a spraying apparatus composed of a receptacle or pot 26 which contains a suitable insulating, quick-drying paint or varnish that passes from the pot 26 downwardly through a tube 21 to a spray-nozzle portion 28. An air pipe 29, coming from a suitable source of compressed air, is brought to a chamber 30, from which it acts to force the paint in a ne spray against a longitudinal portion of a masking tape 3|. It is to be understood that proper adjusting valves are provided for the paint and air pipes. i

The masking tape 5| is a narrow paper tape carried on a freely rotatable reel or spool 32 mounted on the framework As the tape 3| is drawn from the spool 32, it passes around a guide roller t3 and directly thereafter against the central longitudinal portions of the strips I1 in engagement with the rectifying material on the strips so that when the masking tape 3| leaves the peripheral edge of the wheel at the point 34, it leaves a narrow uncovered path 35. on the rectifying material.

As an alternative, the tape 3| may pass around a roller 36 carried on an arm 31 pivoted to the frame at 38. Attached to the arm 31 is a cord 18 which passes over a roller 19 supported on suitable bearings in a frame member, After passing over the roller 19, the cord is attached to a suitable small Weight 35 which, from Figure l, will be noted is pulling in opposition to the tension of the masking tape 3|. Consequently, if the tape 3| should break at some point away from thepulling or drawing structure 8|, the arm 31 will be pulled by the weight 80 and the cord 18 so that the operating plunger 82 on the switch 83 is engaged by a boss 84 on the arm 31 and moves the contacts on the switch member 83 into open position, it being understood that the switch 83 is in closed position, thereby opening the circuit through the motor 8 and stopping the machine.

During the spraying operation, in order to keep the paint from covering up the strip attachment means-that is to say the clips II and i2 and studs ZS-and rendering them inoperative in a very short time, we have provided a plurality of guard or shield means 39 which are pivoted to the rim l of the wheel, the pivot being formed by a pin going through rolled-over portionsi) formed on the members 39. Also, preferably formed integrally with the guard 39 at one end thereof, is a cover 4| having arms 42 and i3 projecting toward the pivotal portions Ml. At the opposite end of the member 39, is a secondary cover 44 having inwardly projecting arms 45 and 46. The cover 4|, with its arms, is adapted to cover two pairs of the closely associated clips Il and I2, as well as the adjacent ends of two of the strips I1, as will be seen in Figure 10; while the cover 44 is adapted to shield the central section of the strip i1 embraced by the holes 2|]v and 2 I.

These shields or covers are carried into shielding position by the member 39 engaging a cam d1 carried on the frame I by support arms "58. It

may be mentioned in passing that the cam 41 has an arcuate length of approximately seventy degrees, with an even rise of'twenty-ve degrees from the point 49 to the point 5|), a twenty-degree dwell from the point 55 to the point 5|, and a twenty-ve-degree descent from the point 5| to the point 512. None of theseangular spacings are at all critical and may be considerably varied.

The cam 41 is located about as indicated in Figure 2 so that the member 39 is moved to and held in shielding position a reasonable distance on either side of the spray-nozzle portion 28. Positioned in alignment with the spray-nozzle portion, above and below the rim and shields, are two exhaust pipes 53 and 54 to take away any excess spray or fumes from the paint.

After the strips have ybeen carried around the wheel E nearly a full circumference, they are released throughthe medium of a roller 55 having oppositely disposed tapered surfaces 55 and` 5lr which pass between the tapered ends of the clips 4| and $2, spreading them apart and unlocking the approaching end of the strip i1 which, from its own resilience, will snap off the end of the guide pin 25 so thatthe operator may 'then take hold of the free end of the strip as indicated in Figure 1; and when the roller 55 engages the following pair of clips .II and I 2, the strip l1 may be removed, it being understood that at this particular time the paint has dried sufficiently so that the strip may be freely handled.

The masking tape 3|, after leaving the rim of the wheel 9, passes around a roller 55 and additional rollers 51 and 58`mounted on the framework After leaving the roller 58, the tape 3| moves into an auxiliary device 8l carried by the frame. The device 8i is shown more in detail in Figures 6, '7 and 8. This part of the apparatus is driven by a shaft 59 connected to the motor 8 through a suitable gear reduction. The outer end of the shaft 59 `is supported by a pair of bushings Sti and 6| carried by frame members S2 and 63. An auxiliary shaft is carried by similar bushings at the opposite ends of the members E2 and G3, and between these two shafts is mounted, for rotation, a double-chain link belt composed of the parts 64 and 65.

Fastened to and carried by the double chain, are a plurality (only two being shown) of` crosspieces 6E which act as outboard guides moving on oppositely disposed ledges S1 carried by the noembers 62 and 63. Carried by each of the chains 64 and G5, are a plurality of arms 68 pivoted by studs Se to portions 'In forming part of the members 6B. rThe outer end of each of the arms 68 has an enlarged curved surface 7! adapted to engage a cam surface i2 on a plate T3. Operatively associated with each of the arms 63, is a member T4 having considerable resilience and which is adapted to be pushed by the arms 68 into gripping engagement with one side of the tape 3|, the opposite side of the tape being simultaneously engaged with a similarly cooperative member on the opposite part 55 of the double chain.

As will be seen from Figure 6, there will be, for a short period of time, two of these sets of arms 58 and members 74 in simultaneous engagement with the tape 3l, although there may be a period when the gripping members shown to the right in Figure 1 are moved out of engagement with the tape, leaving only one set of ngers in tapegripping position.

After the arms 68 pass out of contact with the cam plate i3. they are moved by springs 'l5 into the position shown at the left in Figure 6, and the members 'M are released from gripping engagement with the tape 3l, and this passes into -a tube 'i6 which is connected to a compressed air pipe 'VI that blows the tape out of the tube 16, thereby completing the travel of the masking tape through the apparatus.

It is to be understood that the speed of travel of the masking tape 3i through the auxiliary pulling device 3l is substantially synchronized with the speed of rotation of the rim l of the wheel 8. As a matter of fact, the tape adheres so closely to the strips I1 that are mounted on the rim of the wheel. that there is no slippage of the tape on the strips l1 being treated; yet the tension of the resilient members 14 is such that if there is a variation in the traveling speed of the tape-pulling belt, there may occur a slippage between the fingers M and the tape 3i.

It will be readily appreciated from what has been said, that many of the mechanical details may be considerably varied with-out departing from the spirit of our invention or the scope of the appended claims,

What we claim is:

l. Apparatus for use in the process of making parts for electric-current rectiers including, a supporting frame. a wheel rotatably mounted on the frame, means for rotating the Wheel, strip holding means carried on the wheel for supportingr on the peripheral edge of the wheel elongated exible strips that have been previously operated on and covered along one side with current-rectifying material, with the rectifying material exposed, means for moving a mask over the rectifying material at the central longitudinal part of each strip, means for spraying an insulating coating over the mask and portions of each strip, means for at least shielding said strip-holding means While they are passing the spraying means, means for removing the mask from the coated strips and further means for releasing the strips for removal from the Wheel.

2. Apparatus for use in the process of making parts for electric-current rectiiiers including, a supporting frame, a wheel rotatably mounted on the frame, means for rotating the wheel, strip holding means carried on the wheel for supporting, in end-to-end relation on the peripheral edge or rim of the wheel, elongated relatively narrow strips that have been previously operated on and covered along one side with currentrectifying material, with the rectifying material exposed, means for passing a narrow mask over the rectifying material at the central longitudinal part of the strips, shielding means including shields capable of being moved into a position overlying the strip holding means at the end junction of the strips and at a section intermediate the strip ends, means for automatically moving said shields into shielding position, means for spraying an insulating coating over the mask, the shields and all unshielded portions of each strip, said means for automatically moving said shields into shielding position serving also for automatically removing the shields from their shielding position, means for removing the mask from the coated strips and further means for releasing the strips for removal from the wheel.

3, Apparatus for use in the process ci making parts for electric-current rectiers as set forth in claim 2, further characterized in that the shielding means includes a plurality of devices pivotally mounted in arcuate relation along the rim of the wheel and having cover portions normally spa-ced away from the rim, with arms extending toward the rim which operatively engage with the shield moving means whereby the devices are moved successively into total shielding position as they approach the spraying means.

4. Apparatus for use in the process of making parts for electric-current rectiers as set forth in claim 2, further characterized in that the mask is in the form of a tape drawn from a reel and passed into contact with the strips, while the shields are moved into shielding position directly after thetape is moved into contact with the strips, and then allowed to move into unshielded position directly after they pass the spraying means.

5. Apparatus for use in the process of making parts for electric-current -rectiers as set forth in claim 1, further characterized in that a motor is used to drive the apparatus and the mask is in the form of a narrow tape carried on a reel and passing over a roller carried on the free end of an arm pivoted to the frame, with means for holding the arm in a position so it will respond to said means, should the tape break, to move the arm into contact with a switch member to move said switch member suciently to open the switch and stop the motor, said switch being in the circuit of the motor.

6. Apparatus for use in the process of making parts for electric-current rectiiers as set forth in claim 1, further characterized in that a motor is used to drive .the apparatus and the mask is in the form of a narrow tape carried on a reel and passing over a roller carried on the free end or an arm pivoted to the frame, a cord attached to the arm and passing over a, roller and connected to a Weight serving, with the tape, to hold the arm in a neutral position but, should the tape break, acting to move the arm into contact with a switch interrupting the motor circuit and thereby stopping the apparatus.I

7. Apparatus for use in the process of making parts for electric-current rectiers as set forth in claim l, further characterized in that said. strip holding means comprises a plurality of pairs of clips resiliently mounted in arcuate relation on the rim of the wheel and having notches for slipping over the opposite edge at the ends of the said strips.

8. Apparatus for use in the process of making parts for electric-current rectifiers as set forth in claim 1, further characterized in that said strip holding means comprises a plurality of pairs ofl clips resiliently mounted in arcuate relation onrthe rim of the wheel and having notches for slipping over the opposite edge at the ends of the said str-ips, and Ifurther characterized in that adjustable positioning pins are located around the edge of the wheel rim to cooperate with holes in the strips for assisting in properly locating them on the wheel rim.

9. Apparatus for use in the process of making parts for electric-current rectiflers as set forth in claim 1, further characterized in that moving means for the mask comprise. an auxiliary device carried by the frame, said device having a powerdriven belt, means carried by the belt te openly receive the mask at one end of the belt and to subsequently grip the mask to pull it along with the belt and iinally eject the mask` 10. Apparatus for use in the process of making parts for electric-current rectiers as set forth in claim l, further characterized in that the masi; is in the form of a narrow tape of suitable material and the moving means for the taps includes a power-driven belt having a plurality of spaced transverse guide members with cooperative transversely positioned arms pivotally mounted thereon, said arms carrying resilient members adapted to frictlonally grip the tape on opposite sides thereof, and means for moving said arms to cause said resilient members to move into engagement with the tape and move it with the belt, and means for then releasing the tape near the end of the belt travel. i

l1. Apparatus for use in the process of making parts for electric-current rectiers as set forth in claim 1, further characterized in that the mask is in the form of a narrow tape of suitable material and the moving means for the tape includes y a power-driven double-chain link belt having a plurality of spaced transversely positioned guide members fastened to the two parts of the belt, a pair of cooperative arms pivotally mounted on each guide member, c-ne on each part of the belt, and each having an associated cooperative resilient member for frictionally engaging the tape, spring 12. Apparatus for use in the process of making.

parts for electric-current rectifiers as set forth in claim 1, further characterized in that said moving means for the mask comprises an auxiliary device carried by the frame, said device having a powerdriven belt, means carried by the belt to openly receive the mask at one end of the belt and to subsequently grip the mask to pull it along with the belt and nally eject the mask into a duct, with means for passing compressed air into the duct in a direction which will blow the mask material out of the duct.

13. Apparatus for use in the process of making parts for electric-current rectiers including, a

supporting frame, a wheel rotatably mounted on the frame, means mounted on the frame for rotating the wheel at a desired speed, a plurality of arcuately spaced cooperative means carried by and positioned on opposite sides of the rim of the wheel for engaging and holding elongated flexible strips that havebeen previously operated on and covered along one side with a currentrectifyingv material, with the rectifying material exposed, means for moving a suitable narrow paper tape over the rectifying material at the central longitudinal part of the strips, means carried by the wheel for shielding, for a relatively small arcuate movement of the wheel, said stripholding means, means for spraying an insulating coating over the tape and all other unshielded portions of the strip while the shielding means is in shielding position, means for moving the tape from the wheel, and means for automatically releasing the strips from the holding means near' the end of one revolution of the wheel.

14. Apparatus for use in the process of making parts for electric-current rectiers as set forth in claim 13, further characterized in that the engaging and holding means for the strips are clips resiliently mounted on the wheel and having tapered ends projecting` over the edge of the rim, while the releasing means comprises a small rotatable wheel mounted on the frame and shaped so as to pass between said tapered ends of the clips to spread them sufficiently to release the strips.

l IVANI-IOE P. DENYSSEN.

WILLIAM RIECKEN, JR., Administrator of the Estate of William E. Rieclcen,

Deceased.

No references cited.

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