US1680521A

US1680521A - Universal brush machine

Info

Publication number: US1680521A
Application number: US10291A
Authority: US
Inventors: Jobst Conrad
Original assignee: TOLEDO AUTOMATIC BRUSH MACHINE
Current assignee: TOLEDO AUTOMATIC BRUSH MACHINE
Priority date: 1925-02-19
Filing date: 1925-02-19
Publication date: 1928-08-14
Anticipated expiration: 1945-08-14
Also published as: FR600186A; US1839319A

Description

Aug. 14, 1928.

' 1,680,521 C. JOBST UNIVERSAL BRUSH MACHINE I Filed Feb. 19, 1925 6 sheets-Sheet 1 INVENTOR. 'olwzno J50: r

ATTORNEY5 Aug. 14, 1928. 1,680,521

' C. JOBST UNIVERSAL amqgn MACHINE A Filed Feb. 19, 1925 '6 Sheets-Sheet z INVENTOR.

ATTORNEYS Aug; 14, 1928. 1,680,521

' c. JQBST UNIVERSAL BRUSH MACHINE Filed Feb. 19. 1925 s Sheets-Sheet s Till : I t w P A TTORNEYS Aug.

C. JOBST UNIVERSAL BRUSH MACHINE Filed Feb. 19, 192,5 6 Sheets-Sheet 5 IN VEN TOR famwpfa'esr A TTORNEY.-5

Aug. 14, 1928.

1,680,521 C. JOBST UNIVERSAL BRUSH MACHINE.

Filed Feb. 19, 1925 f e g2 g1 7s 74 f INVENTOR. Jame/40 .7555;-

ATTORNEYS Patented Aug. 14, 1928.

UNITED STATES PATENT OFFICE.

OONRAD JOBST, OF TOLEDO, OHIO, ASSIGNOR TO THE TOLEDO AUTOMATIC BRUSH MACHINE COMPANY, OF TOLEDO, OHIO, A CORPORATION OF UNIVERSAL BRUSQEI MACHINE.

Application filed February The invention relates to brush machines of that type in which brush backs previously bored either in the same or a different machine are carried by an intermittently movable work holder through a cycle successively registering all of the holes of the pattern with the tuft setting mechanism. WVith such machines it is essential that the movement in each cycle should bean exact repetition of those in previous cycles, so that each brush back will have all of its holes filled with tufts. Consequently, whenever a new pat tern is used, considerable adjustment is required. Moreover, brushes vary not only in the pattern of the tufts and the number of holes in the pattern, but also as to the angles at which the tufts are set, so that a machine designed for making one type of brush is not adapted for the manufacture of another type.

It is the object of the present invention to obtain a construction of machine which is capable of being quickly adjusted for the manufacture of various types. of brushes, as well as brushes having a varying number of tufts and in various patterns. T 0 this end the invention consists in various features as hereinafter set forth.

In the drawings:

Figure 1 is a side elevation of the upper portion of the machine;

. Figure 2 is an elevation viewed from the opposite side of the machine;

Figure 3 is a plan view;

Figure a is a vertical longitudinal section;

Figure 5 is a section on line 55 of Fig. 2;

Figure 6 is a section on line 6-6 of Fig. 2;

Figure '7 is an elevation of the variable speed driving mechanism;

Figure 8 is a detailed view of the stop mechanism; I

Figure 9 is a detailed view of the wire feed mechanism;

Figure 10 is a detailed view of the upper wire feed tube;

Figure 11 is a wiring diagram of the electrical mechanism.

The tuft forming and setting mechanism may be of any suitable construction, but preferably is of the type forming the subject matter of my co-pending application Serial No. 527,590. filed January 7, 1922, and comprising a bristle holding magazine 1 having a tapering forward end 2 from which the 19, 1925. Serial No; 10,291.

tufts are successively picked and transferred to a nozzle '3 reciprocated by the pit-man rod 4t and crank 5 towards and from the brush back holder 6. There is also a wire feeding mechanism 7 for a staple forming and driving mechanism (not shown) associated with the reciprocatory nozzle, the vconstruction being such that each time the nozzle is ad vanced into registration with the hole in the brush back a tuft is ejected therefrom into said hole and the securing staple driven into engagementwith the back. lVhere the tufts are setin angular relation to each other, it is usual to drill the brush backs and set the tufts therein in the same machine. To this end I have arranged parallel to the tuft forming and setting mechanism a drilling mechanism having the rotary spindle 8, which is reciprocated by a cam or eccentric 9 mounted on the shaft 10. This shaft also carries the crank 5 for actuating the nozzle reciprocating pitman 4. and an eccentric 1.1 for actuating the staple driving pit-man 12, the parts being so timed that each time the nozzle is advanced towards the work holder 6, the spindle 8 is similarly advanced towards a work holder 6 for the brush back to be bored.

The

work holders

6 and 6 are simultaneously and correspondingly adjusted during the portion of the cycle in which the nozzle and drill spindle are withdrawn therefrom, but are stationary during the drilling and tuft setting operations. In machines of this type it usual to actuate these work holders by cams which mounted 011 a shaft operated in definitely timed relation to the operation of the tuft setting and drilling mechanism. Each change in brush pattern re quires a change in these cams, but whatever am is used, the cycle must be completed in one full revolution of the cam shaft. Thus where a brush has a large number of tufts the angular movement of the cam for each adjustment of the holder is comparatively small, whereas in a brush that has only a small number of tufts the angular movement will be relatively large. Consequently it is not desirable to greatly vary the number of tufts in any one machine and it is usual to provide separate machines for brushes differing materially from each other.

As has been stated, it is one of the objects of the present invention to obtain a machine having a wide range of adjustment both as to the number of tufts, the character of the pattern and the angular relation of the tufts with each other. To this end, instead of the usual fixed timed relation between the tuft setting mechanism and cam shaft, there is provision whereby the same angular movement of the cam may be used for each movement of the work holder regardless of the total number of tufts in the brush. As this would result in an incomplete revolution of the cam shaft for less than the maximum number of tufts, further provision is made for completing the cycle subsequent to the setting of the last tuft in the brush while the tuft setting and drilling mechanism is stationary. This consists in means for disconnecting the cam carrier from its driving train after the stopping of the tuft setting mechanisn'i, driving said carrier by an independent motor to complete its cycle and then reengaging with the normal drive train to be again in fixed timed relation to said tuft setting mechanism, the construction being as follows:

The shaft is driven by an electric motor 13 through the medium of a step-down gear train consisting of the pinion 1d on the motor shaft and the large gear wheel 15 on the shaft 10. At the end of the shaft 10 are the intcrn'ieshing bevel gear wheels 16 and 17, the latter driving the intermeshing

spur gears

18 and 19. The gear 19 is of annular form and is rotatively mounted on a circular bearing :20, in which is cccentrically journaled the shaft 21 having a crank arm 22. This crank arm is connected by a pivotal link 23 with the annular gear 19, so that during each revolution of said gear the shaft 21 will also complete a revolution, but at variable speeds. The shaft 21 is connected by the bevel gear wheels 24; and 25 with a vertical shaft 26 having at its lower end the worm 2T normally in mesh with the worm gear 28. This worm gear is mounted on a horizontal shaft 29 for the cam carrying drum 30, the cams of which, through mechanism to be hereinafter described, actuate the

work holders

6 and 6.

lV'th the mechanism thus far described, it is obvious that each complete revolution of the worm wheel 28 will correspond to an exact number of cycles of the tuft setting mechanism, this determining the maximum number of tufts that can be placed in any one brush. here, however, the brush operated upon has less than this maximum number of tufts, the worm wheel 28 and drum 30 will not complete their cycle and it is necessary to stop the machine at such point. Thus if the machine were again set in motion, the next cycle would not be an exact repetition of the first. This difficulty is overcome through the provision, previously referred to, for arresting movement of the tuft setting mechanism and then indcpendently revolving the cam carrying drum to complete its cycle, the detailed construction being as follows:

The worm wheel 28, or some other member revolving with the shaft 29, is provided with an adjustable pin 31, preferably engaging any one of a series of sockets 32, which are spaced to correspond in number to the cycles of the tuft setting mechanism. This pin is adapted to engage and operate a lever 33 which actuates two

electric switches

34 and 35 to respectively open and close the same. The switch 3i controls the energizing circuit of the motor 13 and also that of an electro-magnet 13", which latter, when deenergized, permits the operation of a brake 13 for quickly arrest-ing movement of the motor. The switch 35 controls the energizing circuit of a second motor 36, which, through the medium of the pinion 37, gear wheel 38, pinion 39 and gear wheel 40, continues the rotation of the worm wheel 28 and drum 30. However, before this movement can be effected, the driving train from the motor 13 must be disconnected, which is preferably accomplished by withdrawing the worm 27 from mesh with the worm wheel 28. To this end the switch 35, when closed, also energizes a solenoid or electromagnet 41, which operates a toggle lever 42 connected with, the bearing 43 for the lower end of the worm shaft 26, the upper end of said shaft being journaled in a pivotal hearing 41. Thus, occurring simultaneously with the deenergizing of the motor 13, the stopping of the tuft setting mechanism and the energizing of the motor 36, the solenoid -11, acting through the toggle levers 42, will withdraw the worm 27 from engagement with the worm gear :28, permitting the free movement of the latter. It is therefore apparent that the setting of the pin 31 determines the point at which the tuft setting mechanism is stopped, but that the worm wheel 28 and cam drum 30 continue to rotate under the actuation of the motor 36.

To stop the rotation of the cam drum, a second pin 45 in fixed position on the worm wheel 28 engages a lever 33 for operating a circuit breaking switch 35. This switch breaks the circuits of the motor 36 and solenoid--11 to stop the rotation of the worm wheel and to permit the reengagement of the worm therewith, but it is absolutely essential, first, that the cycle of the cam should be exactly completed, and second, that the worm should reengage with the worm wheel in the same timed relation as that before disengagement, which is accomplished as follows:

The opening of the switch 35 occurs before the completion of the cycle of the cam drum, which, however, continues to rotate by its own momentum after the motor 36 is de- RI m inseam energized. To prevent the reengagement vof the worm with the worm wheel before completion of movement of the latter, there is arranged upon the bearing43 a linger 43, which extends into engagement with a slide47 arranged in bearings 47 adjacent to the worm wheel. The slide 47 is yieldingly actuated by a spring 47 so as to follow the outward movement of the bearing 43 and finger 43, in which projected position it stands in the path of a stop lug 46 on the worm wheel '28. The worm wheel is also provided with a cam flange 46, which engage the inner end of the slide 47 in advance of .the deenergizing of the solenoid 41 and holds said slide together with the finger 43 and bearing 43 from movement until the cycle of the cam drum is completed. A spring 49 operating counter to the pull of the solenoid 41 tends to restore the toggle levers 42 .to normal position and to thereby force the worm into engagement with the worm wheel, but such movement is prevented as long as the flange 46 is in engagement with the slide 47, so that while the solenoid is deenergized in advance of the completion of the cycle,'the worm wheel is still held "from 'reengagement until the cycle is completed and the stop 46 contacting with the projecting portion of the slide 47 arrests further movement of the cam wheel. As it .is impossible to so time the parts that the inertia of the motor 36 will be overcome at the same instant that the stop 46 engages the slide 47 and as there might be danger of breaking of the parts through the continued torque of the motor, a friction clutch 48 is preferably .arranged between the gear wheel 38 and the pinion 39. This may be of any suitable .construction, but as shown in Figure 6, con sists of spring pressed friction shoes 48 arranged in the hub of the gear wheel 38 and co r perating with associated parts to supply the necessary friction torque. This is limited to avoid any ovcrstrcssing of parts when the stop 46 engages the slide 47, but is suflicient to hold said slide from movement until all motion of the motor 36 is arrested. Thus while the flange 46 is withdrawn from the path of the slide 47 at the same time that. the lug 46 engages said slide, the frietion produced by the torque of themotor while still running holds the slide 47 from movement, so that the reengagement of the worm with the worm wheel is exactly timed.

The cams on the drum 30 must be changed for each brush differing either in number of tufts or the arrangement thereof, and to facilitate such changes a series of different cams may be mounted upon the drum. These are alternatively placed in operative relation with the work holder actuating mecha-' nism by adjustment of the drum longitudinally upon the shaft 29. As shown, the shaft 29 has a tubular portion Within, hich is arranged an adjusting screw 50 operable from the end of the shaft. This screw engages a nut 51, which passes through a longitudinal slot in theshaft and engages the hub of the drum. Thus the drum is ro tatively coupled with the shaft but may be adjusted longitudinally thereon to bring the selected cams into operative relation to the work holder actuating mechanism.

The construction of work holders varies according to the particular type of brush to be manufactured and to enlarge the scope of the machine, exchangeable work holder units are provided. These units are arranged in pairs in operative relation respectively to the tuft setting and drilling mechanism, both being mounted on a base 56, which is detachably secured to the main frame 54 of the machine. At least two types of holders are used as exchangeable units, the one designed to set the tufts parallel to each other and the other in angular relation. Either of these units may be mounted on the frame and by adjusting the proper cams in relation thereto may be successfully operated without other change in the machine.

The unit for setting tufts in angular relation such as" is common practice with hair brushes is of the following construction: The base 53 is provided with swivel bearings 55 for the bifurcated heads 56, the latter having parallel cheek plates 57, which embrace a member 58. This member 58 is pivoted upon a cross pin 59 carried by a slide 60 horizontally movable in the cheek plates 57, while springs 61 engaging said slide yieldably press tl e same in a rearward direction or away from the tuft setting mechanism or drill spindle. The forward end of the member 58 is provided with slideways 62 for receiving exchangeable work holding heads 63 upon which the brush backs are clamped. In rear of the member 58 is a post 64 mountedon the base 53 and carrying at its upper end a horizontally adjustable finger 65, preferably havin a threaded engagement with said post. This finger 65 is adapted to bear against a-pattern face 66 which is exchangeably secured to the'rear end of the member 58 by bolts 67. The pattern is so fashioned as to maintain the brush back clamped in the head 63 aiuniform distance from the tuft setting or drilling mechanism in whatever angular position said head may be adjusted. It is possible, however, to vary such: distance by an adjustment of the finger 65, thereby changing the distance of the brush back from the axis of the swivel head 56 and correspond ingly altering the amplitude of movement. Thus where various shapes of brush backs are operated upon, the pattern 66 may be selected for the particular back and quickly mounted upon the member 58.

lln

The-movements of the work holder about the axis of the swivel head 56 and the pivot of the rocking member 58 are respectively effected by separate cams on the drum 30, which cams 68 and 69 are mounted in adjacent pairs upon said drum. These movements are effected in substantially the same manner as described in detail in my copending application Serial #527,591 filed January 7, 1922. These cams peripherally engage rollers 70 on vertical slides 71 and 72 mounted in bearings 73 depending from the base 53. The slide 71 actuates spiral racks 74, which are in mesh with spiral gear segments 75 on the swivel heads 56, respectively of the tuft setting and drilling work holders. The slide 72 is connected to a cross bar 76 having at its opposite ends the vertical rods 77 passing upward axially through the swivel heads and provided at their upper ends with horizontally slotted bearings 78 for engaging a cross pin 79 on the member 58. Thus whenever the rods 77 are raised or lowered, the members 58 will be rocked upon their pivots and whenever the spiral racks 74 are raised or lowered, the swivel heads 56 will be rotated. The combination of these two movements will produce any desired path of movement of the brush back in the clamping head 63 corresponding to the pattern of tufts to be set in said back.

To facilitate mounting of various shapes and sizes of brush backs in the clamping head 63, these heads are recessed to receive a plastic material, such as plaster of Paris, in which the brush back is set. Thus a firm backing is provided for the brush back which exactly fits the same and the back may be retained by a pair of clamping members 80 on opposite sides thereof.

Operation.

In the complete operation of the machine as thus far described, proper adjustment having been made for the particular work to be performed and brush backs in clamping heads 63 being engaged with the work holders, the machine is started by the operation of a circuit closing switch 81. This energizes the motor 13, which through the pinion 1% and gear 15 revolve the shaft 10, thereby operating both the tuft setting mechanism and the drilling l'nechanisms. At the same time motion is communicated through the bevel gears 16 and 17, spur gears 18 andlt) and variable speed mechanism, including the link 23 and rock arm 22, to the eceentrically journaled shaft 21, thence through the bevel gears 2a and 25 to the shaft 26 and worm 27 which drives the worm wheel 28, and from the latter through the shaft 29, which rotates the drum'30 and earns 68 and 69 mounted thereon. By reason of the variable speed element in this transmission the movement of the cams is at variable velocity, so that for a portion of the cycle there is but slight movement and in another portion a much greater movement. This facilitates the imparting of an intermittent movement to the work holders and diminishes the angular movement of the cams during the interval of rest while enlarging the angular movement during the period of movement. Thus the work is held rigidly during the drilling and tuft setting operations and is moved by a gradual acceleration and deceleration between such intervals of rest.

Assuming that the number of tufts to be setis less than the maximum number possible onthe machine, the pin 31 is engaged with the proper socket 32. Therefore, in the rotation of the worm wheel 28 when this pin 31 engages the lever 33, it will operate the

switches

34 and 35, the one deenergizing the motor 13 and magnet 13 and the other energizing the motor 36. The brake 13 is of any suitable construction to be instantaneously applied when the magnet 13 is deenergized, thereby bringing the driven mechanism to an ahnost instantaneous stop. As specifically shown in Figure 5, the brake comprises a cone member 82 concentric with the motor shaft having a threaded engagement 83 with a stationary bearing 8% and provided with a lever a rin 85 connected to the armature of the magnet 13. The motor shaft has a conical sleeve 86 in close proximity to the cone 82 so that a slight movement of the lever arm 85 will move the cone 82 into a frictional engagement with said sleeve. This will produce a very powerful braking effect and thereby bring the driven mechanism to a quick stop.

The closing of the switch also energizes the solenoid 41, which, through the toggle links 42, moves the worm 43 out of mesh with the worm wheel 28, and by withdrawing the finger 43, permits the slide 47 to be projected by the spring 47" into the path of the stop 46. At the same time, the motor 36 being energized, will through the pinion 37, gear wheel 38, pinion 39 and gear 40 continue the rotation of the worm gear 28, shaft 2.) and drum 30 and

cams

68 and 69 until their cycle is complete. Slightly in advance of the completion of this cycle, the pin 45 engaging the lever 33 will open the'eircuit of the motor 36 and solenoid 41, but the flange 46, by engaging the slide 47, prevents the engagement of the worm until the stop 46 strikes against said slide, arresting further movement of the worm gear. In this position the flange 46 is out of the path of the slide 4-? and as soon as the torque of the motor operating through the friction clutch 48 is overcome, said slide 47 will move out of the path of the lug a6 and will permit the spring 49 to return the toggle levers 42 and engage the worm with the worm wheel.

After the completion of each cycle the work holding clamps are exchanged to remove the tufted brush and to introduce a new brush back, after which the operation is repeated. When it is desired to change to a different brush, the screw 50 may be operated to shift the drum 30, bringing another pair of

cams

68 and 69 into operative relation to the rollers 70 of the slides 71 and 72. If necessary, another pat-tern 66 may be placed on the member 58 and the pin 31 1s adjusted in position to correspond with the cam. These simple changes are all that are required to put the machine in condition for operating on the new brush.

If a change is to be made in the type of brush, such as one having parallelly arranged tufts instead of angularly arranged tufts, the whole work holding unit may be removed by disengagement of the base '53 and a new suitable unit substituted therefor.

Any suitable system of electric circuits may be used in connection with the device previously described, but as shown in Figure 11, the arrangement is as follows: 73, 74 and 75 are the leads of a three-wire electrical service controlled bya switch 76. 77 is an electro-magnetically operated switch having its actuating magnet 7 8 in a circuit 79, which extends from the lead 75 to the lead 74 and includes a push button circuit closing switch 80, and two electro-magnetically operated switches 81 and 82. The switch 81 is closed when its actuating magnet 83 is energized and will automatically open when deenergized, while the switch 82 automatically closes when its actuating magnet 84 is deenergized and will be opened when energized. These magnets are operated by a low voltage electrical current, the magnet 83 being in a normally closed circuit 85 and the magnet 84 in a normally open circuit 86. Thus in the normal position of parts the circuit 79 may be closed by operation of the push button switch 80, which will energize the magnet 78 and close the electro-magnetically operated motor switch 77, starting the motor 13. The closing of the switch 77 establishes, through one of its blades 77*, a circuit 87 which shunts out the switch 80, but includes a normally closed push button circuit breaking switch 88 and the switch 34. There is also established a circuit 87 in shunt with the switch 34and including a switch 89 mounted onvthe main shaft 10 of the machine and adapted to open only in one position of angular adjustment of said shaft. The electric motor 36 is supplied with current from the same leads 73, 74, 75, through an electro-magnetically operated switch. 90 having its actuating magnet 91 in a circuit 92, which includes in series the normally opened switch 35 and the normally closed switch 35*. A shunt 93 around the switch 35, but including the switch 35*, is closed by the closing of the switch 90 through one blade 9O thereof so that such switch will remain closed after the opening of the switch 35. There is also a switch 94 in the circuit 92 in series with theswitches 35 and 35, said switch 94 being mounted upon the main shaft 10 of the machine to be closed only through a limited angle in the rotation of said shaft. The brake solenoid 13 is included in the circuit 95 between the

leads

73 and 74 when the switch 77 is closed, and the worm actuating solenoid 41 is in the circuit 92 between the

leads

74 and 75 when the switch 90 is closed.

WVith the circuits just described, the operation of the push button 80 will start the main motor 13, which continues its opera tion after the push button is released, while the operation of the push button 88 at any time will stop the motor. Also the opening of the switch 34 by the lever 33 will not be effective to open the circuit 87, which main- H tains the switch 77 closed until the switch 89 is also opened, this occurring only at a definite point in the cycle of the tuft setting mechanism. Thus the timing of the opening of the switch 77 is more exact than i would be possible through the switch 34 alone. In a like manner the closing of the switch 35 by the lever 33 will establish the circuit 92 of the motor 36, which will be maintained'closed after said switch 35 is again opened, but the closing of the switch 35 is not effective until the switch 94 is also closed, this occurring at the completion of the tuft setting cycle when further movement of the tuft setting mechanism is arrested. The switch 35, when opened by the lever 33, breaks the circuit for the motor 36 and also that for the solenoid 41.

In the commercial manufacture of brushes it is desirable to stop operation of the machines instantaneously in case something goes wrong, thereby avoiding the wasting of material. For instance, if the wire for forming the staples should break or become tangled, the continued operation of the machine would form and deposit tufts, but without securing the same with staples. Again, if the workman ,is careless and fails to place the work-holding clamps in full engagement with the work holders, proper registration would not be secured and the product would thus be spoiled. To avoid such waste, 1 have provided various controls which instantaneously stop the inachine when anything is abnormal.

These controls are operated by the low voltage circuits 85 and'86, the former being normally closed and the latter normally open. As has been described, the closed circuit 85 energizes the magnet 83, which holds the switch 81 closed and upon the breaking of the circuit 85 the switch 81 will auto matically open, thereby causiiig the opening of the switch 77 for the motor-13. On the other hand, the circuit 86, which is normally open, if at any time closed, will energize the magnet 84, which will open the switch 82, this also causing the opening of the switch 77 for the motor 13. The circuit 85 includes a portion of the wire which is fed to the staple forming mechanism, and therefore, if this wire breaks, the circuit 85 will be automatically opened, which will stop the motor 13. As shown in Figure 11, both circuits S5 and 86 are supplied with low voltage current from the transformer 97, one low voltage terminal being grounded at 98. The circuit 85, after including the magnet 83, leads to a contact finger 99 mounted 011 an insulated support and extending to normally bear against the staple wire 100, this forming the other ground of the circuit. Thus as long as the wire is being fed the circuit is complete, but if the wire breaks and moves out of contact with the finger 9!), this will open the circuit 85, deenergizing the magnet 83 and permitting the opening of the switch 81., which, deenergizing the magnet 78, opens the switch 77 of the motor 13. The circuit 86, after including the magnet 84, extends to various parts of the machine, where any abnormal condition will close a ground. Oneof these parts is a tube 101, which surrounds the staple feed wire 100, but is out of electrical contact therewith. Thus during the normal operation of the machine the circuit 86 will remain open, but if the wire clogs and buckles within the tube 101, this will close the ground, which, by energizing the magnet Set, opens the switch 82, deenergizing the magnet 78 and opens the switch 77 of the motor 13. Another part of the machine controlling the circuit 86 is in connection with the

work holders

6 and 6. As has been described, the work holding heads 3 of the brush backs are exchanged after each large cycle of the machine, being withdrawn and reinserted into the slideways 62. If theoperator fails to press these heads into full engagen'ient with the holders so that the brush backs will be out of registration, this will illltOlTitllLlCtlllY close the circuit 86, so that it will be impossible to start the motor 13. As shown in Figure 11, the

work holders

6 and 6 have mounted thereon the ground closing switches 102. These are so constructed that when the head 63 is in full engagement with the holder the switch will be opened. but if the head is even a small fraction of an inch from its seat. the switch 102 will be closed. thereby preventing starting of the motor 13. It is obvious that similar switches may be placed at various points in the machine, where any lack of operative condition will close the circuit 86 and render the motor closing circuits inoperative.

What I claim as my invention is:

1. in combination. tuft setting mechanism, a work holder for presenting brush backs thereto, driving mechanism for said work holder timed relative to the tuft setting mechanism and including cams for imparting step-by-step movements to said work holder, and means adjustably controlled from Sfll(l-;11]1$ to return the work holder to its initial position after a predetermined number of steps.

2. In combination, tuft setting mechanism, a work holder for presenting brush backs thereto, driving mechanism for said work holder timed relative to the tut'tsetting mechanism and ii'icluding a cam for imparting step-'by-step movements to said work holder, means for stopping said tuft setting mechanism at the completion of said stepby-step movements, means for disconnecting said cam from said driving mechanism, and means for completing the cycle of said cam to return the same to its initial position while said tuft setting mechanism is inactive.

3. The combination of tuft setting mechanism, a work holder for presenting brush backs thereto, driving mechanism betwemi I said tuft setting mechanism and work holders, including cams for imparting step-bystep movements to said work holder corresponding to the number of tufts to be set, means for arresting movement of said timed driving mechanism at the completion of the setting of said tufts, and automatic means operating after the stopping of said mechanism for completing the cycle of the cam to restore the same to its initial position prior to a subsequent operation of said tuft setting mechanism.

4. The combination of tuft setting mechanism, a work holder for presenting brush backs thereto, driving mechanism timed with relation to said tuft setting mechanism including cams for imparting step-by-step movements to said work holder corresponding to the number of tufts to be set, means operating at the completion of the setting of the tufts for disengaging said timed mechanism from said cams, means for independently driving said cams to complete the cycle thereof and means for reengaging said driving mechanism with the cam in its initial position.

5. The combination with a tuft setting mechanism and a work holder for presenting brush backs thereto, of driving mechanism timed with relation to said tuft setting mechanism including cams disengage-able from said driving mechanism for imparting stepby-step movements to said work holder corresponding to the number of tufts to be set, means actuated at the completion of the setting of the tufts for disengaging said drive mechanism from said cams, an independent motor and connecting mechanism for drivlit) ing said cams to complete the cycle thereof, and means actuated when said cams have reached their initial position for stopping said independent motor and reengaging said timed driving mechanism with said cams.

6. The combination with tuft 7 setting mechanism and a work holder for presenting brush backs thereto, of cams for imparting step-by-step movements to said work holder, two independent motors, one operating to drive said tuft setting mechanism and the other to drive only said cams, mechanism timed with relation to said tuft setting mechanism and disengageable with said cams whereby the cam is moved one step for each tuft set, controlled means operating during a predetermined step of said cams for stopping said tuft setting motor and mechanism driven thereby, and for disconnecting said mechanism from said cam and starting said cam motor to complete the cycle of the cam, and means operating at the completion of said cycle for stopping said cam motor and reengaging said connecting mechanism with said cam.

7. The combination with tuft setting mechanism and a work holder for presenting brush backs thereto, of cams for imparting step-by-step movements to said work holder, two independent electric motors, the one for driving said tuft setting mechanism and the other for driving only said cams, mechanism timed with respect to said tuft setting mechanism and disengageable from said cams whereby said cam is moved one step for each tuft set, an electro-magnetic brake for said tuft setting motor and mechanism driven thereby, and means operating during the last step movement of the cam for energizing said electro-magnetic brake, means simultaneously operated for energizing said cam driving motor and for electro-magnetically disengaging said connecting mechanism from said cam, and means operating at the completion of the cycle of said cam for deenergizing said cam motor and electro-mag netic means to permit reengagement of said connecting mechanism with said cam.

8. The combination with tuft setting mechanism and a work holder for presenting brush backs thereto, of timed connecting mechanism between said tuft setting mechanism and work holder including a cam shaft, a cam carrier longitudinally adjustable on said shaftand a series of cams on said carrier adjusted by the movement of the same into alternative engagement with said work holder.

9. The combination with a tuft setting mechanism and a work holder for presenting a brush back thereto, of timed connecting mechanism between said tuft setting mechanism and work holder including a hollow cam shaft, a cam carrier slidably' mounted on said cam shaft, a series of cams mounted on said carrier, an adjusting screw extending within said hollow cam shaft and operable from the end thereof, and a nut engaging said screw having a connection extending through a slot in the. cam shaft to said necting mechanism between said tuft setting mechanism and cam, whereby the intervals of rest of said work holder correspond to the tuft setting operations on the work, and a variable speed element in said connecting mechanism for retarding movement of said cam during the rest intervals of the holder and for accelerating the cam during the re mainder of its movement.

11. The combination with tuft setting mechanism and a. work holder therefor, of a motor for operating said tuft setting mechanism, an electro-magnetie brake for stopping said motor and mechanism driven thereby, a series of cams for alternatively operating said work holder and imparting thereto stepby-st-ep movements, timed mechanism between said tuft setting mechanism and said cams including'a worm wheel on the cam shaft and a worm in mesh with said worm wheel, electro-magnetically operated means for disengaging said worm from said worm wheel, a motor for independently driving said worm wheel and cams when said worm is disengaged therefrom, circuit opening and closing switches for the circuits of said mo tors and other electro-magnetically operated devices, a trip member adjustably secured to said worm wheel in positions corresponding to the steps of the different cams for actuating said circuit closing and opening switches to stop said tuft setting motor and to apply the brake thereto at the completion of the step-by-step movement of the cam and to simultaneously disengage said worm from said worm wheel and energize the independent motor, and a second trip for opening the circuit of said independent motor at the completion of the cycle of said cam.

12. The combination with tuft setting mechanism and a work holder therefor, of connecting mechanism therebetween including a rotary cam having a plurality of equally timed steps for imparting intermittent movements to the holder, each step corresponding to one cycle of the tuftsetting mechanism and all of said steps constituting less than a full cycle of the cam, and means operating at the completion of the stepped movements of the cam for stopping said tuft setting mechanism, means operating to fill work holder, means for automatically operating said cam independently of said tuft setting mechanism after a predetermined step-by-step movement thereof and means for automatically stopping the independent man operation of said cam after a predetermined movement thereof.

14. In a brush machine, the combination of tuft setting mechanism, a work holder for presenting brush backs thereto, a rotary cam having a plurality of stepped portions extending for less than a full cycle of the cam, mechanism operated by said cam for positioning the work holder relative to said tuft setting mechanism, means for driving said cam in timed relation to said tuft setting mechanism for a predetermined portion of the cycle, means for driving said cam independently of said tuft setting mechanism for the remainder of the cycle and automatic control means for alternately operating the driving means aforesaid.

In testimony whereof I aflix my signature.

CONRAD JOBC'I