US2643156A - Brush trimming and bending machine - Google Patents

Description

June 23, 1953 T. MARKS ET AL BRUSH TRIMMING AND BEN-DING MACHINE 4 Sheets-Sheet 1 Filed Nov. 15, 1949 F IG. I.

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BRUSH TRIMMING AND BENDING MACHINE Filed Nov. 15, 1949 4 Sheets-Sheet 2 BY L Uls M. `JIMENEZ A 7 TOR/VF)l June 23, 1953 T. MARKS ET AL 2,643,155

BRUSH TRIMMING AND BENDING MACHINE Filed Nov. 15, 1949 4 Sheets-Sheet 3 FIG. 8.

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IN V EN TORS.

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IN VEN TORS.

THEODORE MARKS JOHN JMENEZ LUIS M. JIMENEZ MMMMM A T TORA/EX Patentecl June 23, 19513 UNITED STATES PATENT oFFlcE BRUSH TRIMMIN G AND BENDING MACHINE' Theodore Marks, John Jimenez, and LuisY Jimenez', Bronx, N.v Y., assignors to" American Brush Machinery Co'., Inc.

Application Novemberis, 1949, serial N. 121462 ecraims. 01. 30o- 17) This invention relates to a brush trimming and bending machine for twisted wire brushes.

Twisted wire brushes are generally formed by inserting a group of bristles from which it is intended to form a brush between a pair of wires which are then twistedtogether thereby rmly securing the bristles between said wires. During the twisting process,` which is generally carried on in a twisting lathe, many ofV the bristles. are displaced making it necessary to trim said brushes to a uniform diameter. It has also been found desirable to form these type of brushes to present a tapered or similar peripheral surface. Such or similar congurations may be imparted to the peripheral surface of the brush by the use of appropriately shaped or positioned trimming knives to trim the brush after it has been formed in the manner indicated. Additionally it is the practice to form said brushes into a variety of shapes such as ovals or circles in order to adapt them to a variety of uses. In so forming or bending the brushes the ends thereof are brought into adjacency with one another thereby permitting said brushes to be ultimately mounted in a handle by inserting the ends of the brush into an axial bore provided therein. It is the object of this invention to provide a machine into which bristles may be successively fed for the purpose of trimming the peripheral surface of said brush to a desired conguration and then bending said brush to a desired shape. It is a further object of thisl invention to provide a mechanism which will automatically and successively present brushes to a trimming device for the purpose of trimming the peripheral surface thereof and thereafter to automatically pre-- sent said brushes to the operation of bending and forming means provided in said device, and to provide additional means for ejecting a brush so formed from the machine.

Other and further objects of this invention will bcc-cme apparent from the description thereof ure 3 is a cross-section taken along line 3 3 of Figure 2;

Figure 4 is a front elevation of the upper portien of the machine showing the indexing and inockout and ejection mechanism;

Figure-5 is a fragmentary top view of the bending arms and jaws, of the machine closed upon the ends of a wire brush taken along line 5-5 of Figure 4;

Figure 6 is a fragmentary side view of the knockout and ejection mechanism;

Figure 7 is a fragmentary perspective View of the cam shaft and valve arrangement; and

Figure 8 is a View, partly diagrammatic, of the cam shaft andi valve arrangement showing the compressedair circuit..

rEhe general type of brush upon which; this invention is intended to operate is illustrated in Figure 2` of the' drawings. The brush ll is generally formed by twisting a pair of wires between which bristles', hairs, wires, laments or fibers of various materials have been inserted, thereby forming a brush havingl a centrally located bristle portion I2 intermediate the two end portions I3 of bare wire. The general purpose of the device is to provide an appropriate feed mechanism wherein a series of brushes are fed consecutively to a trimming; device whereby each of said brushes is reduced to a predetermined or uniform diameter; and thereafter to form or bend said brushes into a desired shape such as the loop illustrated in Figure 5'. The bending or forming operation serves to form the brush into a loop and to bring the ends of said brush into close proximity with one another and to so form said ends as to facilitate their insertion into a brush handle or similar holding device.

In its broad outline the present invention comprises an arrangement whereby brushes are continuously fed to an indexing dial mechanism. As a result of the operation of said indexing dial mechanism each brush is presented in sequence to a trimming mechanism wherein said brush is reduced to a predetermined or uniform diameter. After the completion of the trimming operation each brush is removed from the indexing mechanism and simultaneouslyV positioned so as to permit a bending mechanism to act upon it for the purpose of imparting ther desired shape to each of said brushes! Upon the completion ofthe bending operation each brush is automatically ejected from they entire machine. It should be noted that in View` of the` arrangement hereinafter disclosed, aY brush is in the process being trimmed during the period that a preceding brush is being operated upon by the bending mechanism and a new brush is being presented to the bending mechanism simultaneously with the ejection of a preceding bent brush from the machine.

As shown in Figure 1, the entire device is supported upon supporting table |4. Disposed upon a shelf I formed in the lower portion of said supporting table is main motor drive |6 which actuates cam shaft |1 through reduction gear assembly I8 and determines the timing relation of the various elements of the device. Located in the upper portion of said supportingk table is main plate I9 whereon is located trimmer assembly and its associated motor drive 2| as well as the indexing and bending mechanism which will hereinafter be more fully described. The entire device is timed so that when fed continuously a completely trimmed and bent brush is ejected therefrom upon each complete revolution of cam shaft |1.

Indexing dial mechanism As shown in Figures 1 and 4, the indexing dial mechanism comprises a pair of indexing dial discs 22, 23, along the periphery of which notches 24 are formed at equally spaced intervals. The notches on each of the discs located are at similarly spaced intervals so as to permit their alignment in order to support the ends of a brush therein. Dial discs 22, 23 are keyed to rotate. with shaft and are journaled in standards 26, 21 which are secured at the sides of supporting table |4. Dials 22, 23 are securely located on shaft 25 by means of set screws 28, 29 which thus permit such location along the shaft to be varied in order to accommodate brushes of varying lengths. Figure 4 shows a brush in position in a pair of dial discs notches 24.

As shown in Figures l and 4, substantially half of the circumference of discs 22, 23 is surrounded by guard plates and 3| respectively. Guard plates 30 and 3| are positioned in spaced relation to the peripheral surfaces of discs 22 and 23 respectively but are sufficiently close so as to prevent the displacement of brush ends i3 from notches 24 while a brush is being supported by said discs and being operated upon by the elements of the machine. In order to permit the alignment of guard plates 30 and 3| with discs 22, 23, as said discs are variously positioned along shaft 25 for the accommodation of brushes of varying lengths; each of said guard plates is provided with a screw threaded portion 32 which is adapted to receive a portion of screw bars 33, 34. Said screw bars are journaled in standards 26, 21, one end 35 of the upper screw bar 33 being adapted to engage with a detachable hand crank or similar device, not shown. Each half of each of the screw bars is threaded in reverse direction from the center. Sprocket wheels 36, 31 are keyed to bars 33, 34 respectively and a driving connection is provided between said Wheels by means of sprocket chain 38. It will thus be seen that upon the rotation of upper screw bar 33 by means of a hand crank as indicated above, both of said bars will be caused to rotate simultaneously and cause guard plates 30, 3| to be simultaneously moved to a position symmetrically from the centers of said bars and to any desired distance from each other in order to accommodate brushes of varying lengths. By means of this arrangement the position of the guard plates may advantageously be utilized as guides to indicate the proper location of the discs 22, 23 for a particular length brush thereby permitting the positioning of said brush substantially centrally of the machine.

Indexing movement is imparted to discs 22, 23 by means of a ratchet drive arrangement. One end of shaft 25 is extended beyond its supporting standard 26 and ratchet wheel 39 is keyed thereto. Ratchet wheel 39 engages with pawl 4U which is carried by crank arm 4|. One end of said crank arm is rotatably mounted on the end of shaft 25, said crank being actuated by rod 42 which is linked to crank disc 43 mounted on shaft by means of a pin. It will therefore be seen that the rotation of crank disc 43 will cause discs 22, 23, to advance intermittently in the direction indicated by the arrow adjacent to said discs in Figure l. The arrangement is such as to cause said discs tobe rotated through the arc between adjacent notches 24 thus causing said discs to index one position stepwise upon each rotation of cam shaft |1. Brushes may be fed or positioned in the notches in the discs in succession,

` manually, or by means of a hopper or similar arrangement and each brush is advanced stepwise in order to permit the elements of the machine to operate upon each of them successively. The rst such operation is the trimming operation which reduces said brush to cylinder of the desired or uniform diameter.

Trimmer assembly As a brush is advanced by the indexing mechanism it is positioned directly opposite trimmer assembly 2U as indicated by the letter A in Figure l. Said assembly comprises a housing 44 within which drum 45 is rotated with shaft 46. Said drum is rotated by means of motor 2| through drive belt 41 and a pulley located at one end of said drum. Radially extending trimmer blades 48 are positioned in the periphery of said drum and are adapted to cooperate with stationary trimmer blade 49 secured to said housing by means of adjustable screw bolt assembly 50 thus permitting the adjustment of the position of stationary blade 49 with reference to blades 48 upon the rotating drum for the purpose of bringing them in proximity in order to provide a trimming action. As shown in Figure 2, main plate i9 is pro-vided with slide rails 5| adapted to cooperate with complementary slide rail on the base of trimmer -assembly 29 in order to permit the position of said trimmer assembly to be varied with reference to dial discs 22, 23 thereby permitting said machine tobe adjusted to trim brushes of various diameters as desired. The trimmer assembly is secured in selected position by means of bolts 52. Since discs 22, 23 index one position for each rotation of cam shaft |1 it will be seen that a fresh brush is presented to the operation of the trimmer assembly upon each such rotation. The brushes are freely rotatable in notches 24 and the rotation of drum causes blades 48 to strike the bristles of said brush and imparts rotary movement to the brush as it is being trimmed, thereby causing the entire circumferential surface of the brush to be trimmed as desired.

Upon the completion of the trimming operation the brush is advanced two positions stepwise and arrives at the position indicated by the letter B in Figure 1, at which point it is properly positioned for removal from` the discs by the knockout assembly in order to be operated upon by the bending and forming mechanism.

Knockout and ejector assembly As shown in Figure 4, the knockout and ejector assembly is mounted on bridge plate 53 which is secured to main plate I9 by means of posts 54. Secured to bridge plate 53 are brackets 55, 56 which rotatably carry shaft 51. Secured to said shaft for rotation therewith are arms 58 to which knockout plates are secured asis more clearly shown in Figures l, 4, and 6. Connecting arms 58 is cross bar te which carries ejector 6I. It will thus be seen that upon rotation of shaft 5i through a portion of a revolution, knockout plates 59 and ejector 5i are lowered simultaneously. Rotary movement is imparted to said shaft by means of a rack and pinion assembly.

Keyed to one end of shaft 51 is pinion B2 which engages with rack 63. Said rack is slideably mounted en plate 89 which is secured to bridge plate Said rack is secured to piston rod 65 of air cylinder et which it reciprocably actuates said rack thereby rotating shaft 51 by means of pinion 52 through a portion of a revolution and simultaneously depressing knockout plates 59 and ejector ti. The knockout plates and ejector are raised by the reverse movement ofthe rack.

Guard plates 30, 3l do not extend below the position of the notch in dial discs 221, 23` indicated by the letter B in Figure 1. Thus as each pair of notches reaches said position the brush which is located therein is free to drop therefrom. In to retain temporarily said brush within said notches, a latch assembly is provided immediately below position. The latch assembly com- `prises a latch arm iii', counterweight 68 carried by said latch arm and a pivot post E9 intermesaid elements. Counterweight t8 retains latch arm ti in raised position thereby acting as closure fer the notches positioned at B and temporarily retaining the brushpositionedV within The removal of the brush from the at this point is accomplished by means action of knockout plates 59. As said .ud by means of air cylinder 66; the. brush acts to force latch arm bi downwardly until the brush the of said arm which is then returned to its normal up position by means of counterweight The brush is brought to rest upon bender posts fili as more clearly appears from Figures 2 and 6 thereby appropriately positioning said brush for the bending operation.

ll'andrel (md wedge rassembly The brush is formed or bent arounda mandrel and wedge assembly comprised' of mandrel 'H and wedge l2'. The mandrel isV more. clearly illustrated in Figures 3 and 5 andv is shown as cylindrical, said form being advantageous in order to form a brush of the common looped variety. It will be understood however that the. configuration of said mandrel may be varied or a number of them may be utilized in order to produce bends of different configurations. The mandrel is secured to one end of the sliderl. Slidey 13 is provided with a longitudinal slot 'Iii` whereby it may be adjustably secured to bridge plate 53 by means of bolt in order to permit the adjustment of said slide fer brushes or mandrelsof varying diameters. A brush formed around the. mandrel isv shown" in Figure 5. As appearsfrom said figure,.the'ends itlof the brush are bent ais-7S in order tof facilitate the insertion of said brush within a cavityin a handle. This bend is accomplished bythe interposition of wedge 'l2V between the ends- I3 of said brush while it is being bent around the' mandrel. Dependingly secured to slide T3 is post Tl to which wedge i2 is adiustably secured by means of bolt it passed through slot 'i9 in said wedge. Thus the location of the bend in the wire ends-may be varied as well as the angle thereof bythe adjust- 6 ment of the position of the'wedge orA by substitution of wedges of different thickness.

Bending mechanism As the brush is brought to rest upon bender posts 'I9 it is brought to bear and is firmly positioned against mandrel H by means of fork 88. As more clearly appears from Figures 2 and 3, said fork is secured to rod 8| which. is slideably mounted for reciprocationin guides 82. There.- mote end of rod 8l is secured tothe pistonrod of air cylinder 83 which in turn is secured to main plate i9. A collar 84 is adjustably positioned on rod 8l and acts as a stop; to limit the forward movement of said rod and the forkelement se;- cured thereto. Upon the. forward actuation of rod 8| by means. of air cylinderV 83, the fork engages a portion of thebrush wires andcauses said brush to bear rmly against mandrel l. It will be noted that thebrush ends slide along and con.- tinue to rest upon posts 1B. As a resultof. this arrangement displacementof the brush from its proper position during the bending operation. is prevented.

As shown in Figure 1,.the'. bending mechanism is actuated by means of 'air cylinder. 85 located upon the shelf l5 carries by supporting table-ifi. Said air cylinder is'mounted vertically and pivotally secured to said shelf at. 86. Piston rod 8i of said air cylinder has pivotally secured thereto toggle arms 88, 89. Arm is pivotally secured t0 plate 90 which. isV adjustably positionedupon the main plate by means of bracket and screw arrangement 9i. Arm 89 of said toggle is pivot'- ally secured to rack 92 which isslideably mounted for reciprocable movement in slide 93 secured to the undersurface ofplate I9. It will thus be seen that when the piston rod 89 of air cylinder is moved upwardly toggle arms 88, 89 spread, and assume a more nearly horizontal position, moving rack 92 forward. A small degree of adjustment is provided for the extent movement of said rack by reason of theV adjustment which may be made in the position of plate 90 upon which arm 88 of said toggle arrangement is anchored.

As more clearly appears from Figure e rack 92 meshes with gear 9a which is. in mesh with gear 95 of similar diameter. Said gears are supported by housing 95 depending from the undersurface of plate i9. Gears 94, 95 are keyed to shafts 9i, 99 respectively. As shown in Figures 3 and el, the lower ends of said shafts are carried by bearings 99 and. it@ respectively. The upper ends of said shafts are carried by bearings IDI, I 02 supported by `main plate i9. As a result of the meshing of gears Se and 95 in this arrangement shafts 9? and t8 are caused to becounter-rotated upon the movement of rack 92.

The bending arm assembly is supported by means of front crank plate 03 and rear crank plate lili.i each of which is secured to main plate l@ as ismore clearly shown in Figure 2. Bending arms. l5, its are linked to the rear crank plate by means of rear crank arms |01 and |98 re'- spectively. Forward crank arms |89, H9 are keyed to the endsof shafts 9'! and 98 respectively which extend above the surface of crank plate itt. The free ends of saidl crank arms are provided with a series of perforations H3 which are adapted to receive bolts in order to pivotally secure each of the bendingarms to the forward crank arms. By selecting thevappropriate perforationstheinitial and clamping4 position of the bending arms maybe adjusted for the-accomfv modation of various sizes of brushes and bends. Secured to the ends of each of bending arms and |06 and disposed at an angle with relation thereto are bending jaws and ||2 from each of which a bender post extends. It will thus be seen that the forward movement of rack 92 results in the rotation of gears 94 and 95 toward each other as viewed from the front of the machine and as a result thereof bending jaws and H2 are caused to move in a forward direction toward each other as viewed from the front of the machine thusbending the brush around the mandrel and wedge. The resultant position of the elements of the bending crank assembly are indicated by the broken lines in Figure 2; the position of the bending jaws and brush being shown in Figure 5. Upon the rearward movement of the rack the gears rotate away from each other thereby restoring the bending assembly to its previous position. The simultaneous forward and inward movement of the bending jaws results in a more uniform and smooth bend in the brush around the mandrel. It has been found advantageous to form said bending jaws with beveled edges ||4 and ||5 in order to provide a suitable Contact surface between the bending jaws and the brush ends during the bending movement.

It will be noted that during the completion of the bend, the ends of the brush are automatically bent at i6 as shown in Figure 5, by reason of the'interposition of wedge 'l2 between said brush ends. It will also be noted that the entire bending arrangement is disposed in a plane parallel to the main plate I9 and that the bending of the brush is carried on the same plane. The brush is rmly positioned on posts 10 at all times during said operation until the iinal phase of Ithe bend is accomplished.

Timing mechanism The timing of the Various operations carried on by the machine is determined by the rotation of cam shaft |'1 as more particularly shown in Figures 7 and 8. Shaft is keyed to cams H6, 'i il and is. Associated with said cams are followers ||S, and |2|, which in turn actuate air valves |22, |23 and |24 respectively. Said air valves are connected to a common source of compressed air. Suitable tubing or similar conduits are provided to carry the compressed air from said valves to the various air cylinders which operate the mechanisms of the machine. The knockout and ejector assembly are operated by air cylinder 66 which is supplied with compressed air at suitable intervals through valve |22 which is actuated by cam I6 on cam shaft In the position ol shaft indicated in Figure l, the crank pin has reached its highest position thereby causing pawl i0 to reach the limit of its movement and terminating the indexing movement of dials 22, 23. A brush is then located at the station indicated by the letter A and the trimmer blade which is constantly rotating causes said brush to be trimmed during such stationary or dwell period. A brush is similarly at the position indicated by the letter B and rests upon latch arm |51. As shaft continues to rotate and reaches a position approximately 10 in the direction indicated, cam ||6 begins to open valve |22 which actuates air cylinder 66 and causes the knockout plates to descend upon said brush and rmly position it on posts 10 thereby properly positioning it for the operation of the bender mechanism. As heretofore indicated, ejector 6| descendssimultaneously and ejects the previously bent brush through an opening |25 in main plate I9. The knockout and ejector action is more clearly illustrated in Figure 6.

As said brush comes to rest upon posts 10 and after the shaft has rotated approximately an additional 10 from the point previously indicated, the action of cam |'I begins to open valve |23 thereby introducing compressed air into the cylinder 83 which begins to move fork 80 forward, as said fork reaches its foremost position it moves the brush along posts 10 and firmly positions the brush against mandrel 1|. When the brush has been firmly positioned against the mandrel by fork which occurs after an additional 10 rotation of shaft l1 from the point heretofore indicated, cam ||6 again actuates valve |22 and causes air cylinder 65v to return to its previous position. Arms 58 are thereby caused to return to their raised position.

Upon the additional rotation of cam shaft through approximately 5 valve |24 is actuated by cam I8 and causes piston rod S1 of air cylinder 85 to be raised, thereby spreading arms 38, 89 and causing the bending arms |05, |0 to be actuated to bend said brush around mandrel Tl. Fork 80 and the bending arms |05, |00 remain in actuated forward position as cam shaft |7 continues to rotate additionally for approximately at which time crank disc 42 has reached its lowermost point and begins to rise thereby initiating the rotation of the dial discs for the next position. Upon an additional rotation of said cam shaft through 20 fork 80 is returned to its normal rearward position by means of the actuation of air cylindeil 83 resulting from the operation of cam Il? on valve |23. Air cylinder 85 is then returned to its previous position after an additional rotation of cam shaft I1 through approximately an additional 15 by means of the action of cam !8 on valve |24 and retracts bending arms |05, |06 thereby opening the bending jaws. As cam shaft reaches its original position indicated in Figure l, the dial discs have arrived at their next position and the operating cycle of the machine is repeated.

We have here shown and described a preferred embodiment of our invention. It will be apparent, however, that this invention is not limited to this embodiment and that many changes, additions and modifications can be made in connection therewith without departing from the spirit and scope of the invention as herein disclosed and hereinafter claimed.

Having` described our invention, what we claim as new and desire to secure by Letters Patent is:

1. In a twisted wire brush trimming and bending machine, a support, a shaft rotatably carried by said support, dial discs mounted on said shaft, circumferentially spaced slots formed in the periphery of said discs adapted to support the ends of a twisted Wire brush when positioned therein, guard yplates extending around substantially half of the peripheral surface of each of said discs terminating short of the lowermost station of said discs and adapted to prevent the displacement of such brush from said slots, a latch positioned below said lowermost station of said discs and adapted to removably retain such brush within said slots.

2. In a twisted wire brush trimming and bending machine, a support, a shaft rotatably carried by said support, dial discs mounted on said shaft for rotation therewith, circumferentially spaced slots formed in the periphery of said discs 9 adapted to support the ends of a twisted wire brush when positioned therein, a rotary trimming drum in spaced relation to said discs adapted to trim the peripheral surface of such brush it stationed in juxtaposition thereto by said discs, a rotatably mounted shaft axially parallel with the axis of said discs, a pinion secured to shaft for rotation therewith, a rack in engagement with said pinion, an air cylinder adapted to reciprocate said rack, arms extending from said shaft, depending plates carried by said arms adapted to descend upon such brush positioned in the slots in said discs and thereby remove said brush from said discs, a depending post carried by said arms and adapted to simultaneously eject a brush from machine.

3. in a brush trimming and bending machine, a support, a shaft rotatably carried by said support, discs mounted on said shaft, each of said discs being provided with circumferentially spaced slots adapted to receive the ends of a twisted wire brush, set screws mounted on the hubs of said discs for selectively positioning said discs along said shaft, a guard plate extending around substantially half of the circumference of each of said discs and adapted to overlie said slots in order to retain the brush ends therein, screw threaded perforations in the upper and lower portions of said guard plates, rotatable screw threaded bars adapted to be threadedly received in said perforations and to position said guard plates, each half of each of said bars being threaded in a reverse direction, a sprocket wheel positioned on each of said bars for rotation therewith, and a sprocket chain interconnecting said wheels for simultaneous rotation.

4. A brush trimming and bending machine comprising a support, a main plate carried by said support, a shaft rotatably carried by said support, indexing dial discs mounted on said shaft and provided with circumferentially spaced slots adapted to support the ends of a brush, means to intermittently rotate said indexing dials to advance one station at a time, a rotary trimming drum carried by said support and positioned in spaced relation to said dials and adapted to trim the peripheral surface of each brush as it is presented thereto by said indexing dials, guard plates adapted to surround a portion of said indexing dials and adapted to retain a brush within said slots, a pair of pivotally mounted plates adapted to remove a trimmed brush from said indexing dials, a mandrel around which a brush may be bent, a wedge shaped element positioned in spaced relation to said mandrel, a reciprocable fork adapted to retain a trimmed brush against said mandrel, a pair of'bending arms adapted to bend said brush around said mandrel and wedge, a pivotally mounted depending post adapted to eject a bent brush from said machine.

5. The device according to claim 4 wherein said pivotally mounted plates and said depending post are secured to a common shaft being adapted to remove a brush from said indexing dials simultaneously with the ejection of a brush from the machine.

6. The device according to claim 4 wherein the means to intermittently rotate said indexing dials are comprised of said shaft to which said indexing dials are secured, a pair of standards adapted to rotatably support said shaft, a ratchet wheel secured to one end of said shaft, a pawl adapted to engage with said ratchet wheel, a crank arm rotatably mounted on said shaft, a motor drive, a cam shaft adapted to be rotated by said motor drive, a crank disc secured to said cam shaft and a rod linking said crank disc to said crank arm whereby said indexing dials are advanced one station upon each rotation of said cam shaft.

7. The device according to claim 4 wherein bending jaws are secured to one end of each of said bending arms and a crank arm is pivotally secured to the rear portion of each of said bending arms, the other ends of said crank arms being pivotally secured on said main plate, a crank arm pivotally secured to the forward porB tion of each of said bending arms, a pair of meshed gears rotatably carried by said plate, shafts secured to said gears, one end of each of said shafts being secured to the free ends of said latter crank arms whereby said bending arms are moved forwardly and toward each other upon the rotation of said gears in one direction and away from each other when the direction of rotation of said gears is reversed, a reciprocable rack in mesh with one of said gears adapted to rotate said gears upon 'the reciprocation thereof.

8. A brush trimming and bending machine comprising a support, a shaft rotatably carried by said support, indexing dials carried by said shaft and provided with circumferentially spaced slots adapted to support the ends of a wire brush, means to intermittently rotate said indexing dials to advance one station at a time, a rotary trimming drum carried by said support and positioned in spaced relation to said dials and adapted to trim the peripheral surface of each brush as it is presented thereto by said indexing dials, guard plates adapted to surround a portion of said indexing dials within said slots, a pair of pivotally mounted plates adapted to remove a trimmed brush from said indexing dials, a mandrel around which a brush may be bent, a wedge shaped element positioned in spaced relation to said mandrel, a reciprocable fork adapted to retain a trimmed brush against said mandrel, a pair of bending arms adapted to bend said brush around said mandrel and wedge, a pivotally mounted depending post adapted to eject a bent brush from said machine, a motor drive, a rotatable cam shaft adapted to be rotated by said drive, cam elements mounted on said shaft, cam followers adapted to cooperate with said cams, air Valves adapted to be actuated by said followers, an air cylinder adapted to simultaneously actuate said pivotally mounted plates and said depending post and compressed air conduits connecting said air cylinder with one of said air valves, a second air cylinder adapted to reciprocate said fork, compressed air conduits connecting said air cylinder with a second of said air valves, a third air cylinder adapted to actuate said bending arms, compressed air conduits connecting said third air cylinder with a third of said air valves.

THEODORE MARKS.

JOHN JIMENEZ. LUIS M. JIMENEZ.

References Cited in the le of this patent UNITED STATES PATENTS Number Name Date 1,650,248 Van Veen Nov. 22, 1927 1,706,715 Van Veen Mar. 26, 1929

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