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Nov. 19, 1946. J. HALL 2,411,265 MACHINE FOR MAKING CIRCULAR LATHE BRUSHES Filed May 15, 1943 2 Sheets-Sheet l NOV. 19, 1946. J, HALL 2,411,265 MACHINE FOR MAKING CIRCULAR LATHE BRUSHES Filed May 15, 1943 2 Sheets-Sheet 2 2,411,265 Patented Nov. 19, 1946 UNITED STATES PATENT OFFICE 2,411,265 MACHINE FOR MAKING CIRCULAR LATHE BRUSHES James Hall, Leeds, England, assignor to Kings wood Manufacturing Co. Limited, Letchworth, Herts, England, a company of Great Britain Application May 15, 1943, Serial No. 487,173 In Great Britain May 26, 1942 7 Claims. (C1. 300-.-3) 2 1 This invention relates to machines for making circular lathe brushes, especially circular dental lathe brushes, with rows of converging bristles, i. e._. machines which drill the brush stocks and/or ?ll drilled stocks with bristles, Brushes of this type comprise a cylindrical wooden stock which is drilled all around its cylindrical face with two inserting means 4, 5. Each of the stock holders comprises a pair of side arms and a rear part with a web between the arms carrying a rotatable stock receiving pin 5. The forward ends of the arms have resilient buffer means 1 associated with the pivot pins 2 which support the holder and the back face of the rear part has a cam or more rows of holes, staggered in relation to face 8 working against the rounded front endof may be duplicated with a common control device on a combined drilling and bristle inserting ma chine. track it which acts as a support for the rear of the holders, The latter are tied together by a cross bar 52 with a pendant arm is intermediate the operating arm 9. In this manner a stock one another and running parallel with the side faces of the stock, into which bristles are inserted. ll) holder i can be moved about its pivots 2 with a stock iii thereon and an even depth of hole will The brush in use is rotated at high speed for be maintained in the different rows in relation to buf?ng dental plates or the like. ' the straight stock face being tilted. The general The main object of this invention is to improve construction and arrangement of the machine the machine stock holders and their control de parts for operating the stock holders ! towards vices, that is, each stock holder is pivoted to allow and away from the means 4i and 5 are of known a stock to be tilted or inclined for changing its type and the only members shown are the arms position so that different rows of holes can be 6 (which are tied together and slide horizontally drilled at the correct angle and a supporting cam in the machine frame) to which the carrier heads track is furnished for enabling such movement and angle of presentation to be effected at will by 20 3 are secured. The arms are reciprocated'tin bearings by a rocking lever in known manner. a single operative movement. This arrangement The device for tilting the stock holders I about is equally applicable to the stock holder which their pivots 2 after the ?rst simultaneous drilling supports a drilled stock during the bristle inser and filling operations, comprises a stepped cam tion operation. Furthermore‘ the stock holders Another object is to advance automatically, during the tilting movement of the stock holder, the means which rotate the stock, so that the holes of a subsequent row will be staggered in relation to the holes in the previous row. Referring now to the accompanying drawings, an embodiment of the invention is shown by way ' of example and will be described as applied to a combined drilling bristle inserting machine, wherein a pair of stock holders are adapted to be advanced towards and away from the drill and bristle inserting means. . Fig. .l is a part sectional side elevation showing one of the stock holders and the control means; Fig. 2 is a sectional side elevation of a stock holder; Fig. 3 is a plan view showing the general ar rangement of the stock holders and mechanism; Fig. 4 is a plan view,‘ from beneath, of the mechanism for rotating brush stocks, and Fig. 5 is a fragmentary view, partly in section, oi the cam track and associated member for im parting a step-by-step angular adjustment to the stock holders. A pair of stock holders l are pivoted at their front ends by pins 2 to a pair of bifurcated car rier heads‘3 arranged on the machine behind, and in alignment with, the drilling and bristle its ends having a roller iii (in two parts) at its lower end working in a slot Ma formed in a hori zontal member 65. rl‘he roller is divided at its center (for mounting purposes) with end flanges tic-b, i. e. like a transversely split bobbin. In this . manner although the member i5 is secured to the top of a vertical cam rod is which rests on the stepped cam track ii and is supported freely in a stationary boss ll’ (?xed to the machine frame) to have a rising and falling motion under the control of the cam track, the ?anges Mb main tain the relative positions of the roller Ill and the guide member !5.' Also, the member 15, which is merely the supporting link between the arm island the cam rod I6, is slotted because the arm is has a horizontal reciprocatory move ment with the stock holders I whilst the rod [6 has a vertical reciprocatory movement in the ?xed boss ll. The cam track i! is extended for, wardly in the form of a handle l8 which may be supported by the machine frame and the cam track itself is supported in the boss I‘! in which the cam rod works. As the handle I3 is pushed in, the cam rod l6 slips from the top step of the cam track itself down an incline to the next step so that the horizontal slotted member 15, the pendant arm !3 and the cross bar l2 all fall caus ing the stock holders l to tilt downwardly about 2,411,265 4 their pivots 2. The stocks ID are now at the cor the pawls 26 are released temporarily by manual operation of the trip member 29 and the cross bar l2 pulled up by means of, say, a handle 35 rect level and angle in relation to the drilling and ?lling means 4, 5, for a second row of holes to be drilled and ?lled, The cam track can again be operated for a further row (or rows) of holes and is stepped to correspond with the num ber of rows of holes it is desired to drill and ?ll. To retain the cam track in each adjusted position, the handle it is notched to receive a spring actu ated lever l9. _ To afford adjustment for varying the number when the stepped cam track 3! can be pulled for wardly its full extent. It is to be understood the invention may be applied to separate drilling and ?lling machines and that it can be modi?ed in a variety of ways without departing fromthe scope thereof, 10 What I claim is: 1. In a machine for making cylindrical brushes of rows of holes in a stock, di?erent sizes of spac of the dental lathe type, a stock holder, a pin ing collars Fill may be inserted between the cross rotatably supported on said stock holder for re bar i2 and pendant arm is to pivotally lift or ceiving a cylindrical brush stock, a carrier head lower the stock holders with respect to the 15 having pivot means supporting the forward end stepped cam track and so centralize the stocks of said stock holder for angular movement to with the drill and ?lling means. Other adjust present the stock to work devices so that different ing means may be employed. Make-up washers rows of holes may be drilled or ?lled with bristles 2! are also used on the stock receiving pins 5 for at the correct angle, means supporting said car the stocks to rest on so as to allow for diilerent rier head for reciprocatory movement with re widths of stocks and a top and bottom clamping spect to said work devices, and means connected washer 22 grips each stock. To support Or brace to the rear end of said stock holder to support each of the pins 6 against the pressure of the the stock holder for reciprocation with said car drilling and bristle inserting means 4, 5, a pivoted plate 23 has its bifurcated outer end dropped on 25 rier head, said supporting means being adjustable vertically to effect the desired changes in the an to the upper stock clamping washer 22 before the gular presentation of the cylindrical brush stock. nut 25! is located on the pin. 2. In a machine for making cylindrical brushes To enable the distance between the rows of of the dental lathe type, the invention as recited holes to be adjusted, the head of the aforesaid in claim I, wherein said supporting means in pendant arm i3 is secured in a transverse slot 12a cludes a cam rod engaging a stepped cam track, in the cross bar I 2 so that the effective radial dis a horizontally slotted member secured to said rod, ' tance between the roller M and the stock holder an arm secured to the rear portion of said stock pivots 2 may be varied at will by movingr the arm l3 in said slot slightly nearer to or further from said pivots for adjusting the actual arcuate move ment of the stock holders. The stock receiving pins t are rotated by ratchet wheels 25, which are operated by pawls holder, and a roller carried by said arm and co 35 operating with said slotted member to support the rear end of the stock holder for reciprocatory movement. 3. In a machine for making cylindrical brushes of the dental lathe type, the invention as recited 26>carried by brackets 21, mounted freely on the bosses of the ratchet wheels, linked together by 40 in claim 1 wherein said supporting means in a cross rod 28 and a trip member 2% engaging a stationary roller 36 each time the bifurcated cludes a cam track, a cam engaging device having a horizontal slot at its upper end, an arm secured to the rear end of said stock holder and carrying means cooperating with said slotted device to heads 3 are retracted by the machine mechanism (not shown) to a normal position. The arrange ment is to advance the ratchet wheels 25 tWo 45 guide said stock holder during reciprocatory movement thereof. , e teeth each time during the operations on any one ‘i. In a machine for making cylindrical brushes row of holes, and to start the next row (having a of the dental lathe type, the invention as recited in claim 1 wherein said supporting means in from the'last hole of one row to the first hole of 50 cludes a cam track and means automatically locking the same in each adjusted position. the next row. 5. In a machine for making brushes, a stock ' holes in adjacent circumferential rows holder including a rotatable pin on which a cy are thereby, staggered, and the falling move ment of. the stock holders I is arranged auto lindrical brush stock may be secured, pawl and ’ matically to rotate the stocks it] the required 55 ratchet. means for imparting angular movement to said pin, a reciprocatory carrier having pivot amount. As the stepped cam track ll lowers the similar spacing for the‘ holes) after advancing the ratchet wheels only one tooth during the change stock holders, a member 3! secured on the cross means mounting said stock holder for tilting link rod 28 of the pawls 26 bears down on to the movement about an axis normal to the axis of nearest one of a series of ?xed pins 32 (whose said pin, means including a cam track and cam free ends are chamfered off to form downwardly 60 rod for imparting a step-by-step tilting move inclinedv cam tracks), so that as the rod 28 is ment to said stock holder, and means actuated by capable of axial movement against the action said stock holder during movement thereof to of its return spring 33 (anchored to the adjacent operate said pawl and ratchet means to impart a stock holder I) the member 3! slips laterally and downwardly off the pin 32, causes the rod 28 to move axially which through the pawls 26 ad ' vances the ratchet wheels 25 one tooth and so staggers the holes in the next row, As the mem step advance to said pin. 7 , 6. In a machine for making brushes, a stock holder including a rotatable pin- on which a cy lindrical brush stock may be secured, pawland ratchet means for imparting angular movement her 3! slips off the pin 32 (carrying the rod 28 to said pin, a reciprocatory carrier having pivot with it) it’is immediately pulled back above the 70 means mounting said stock holder for tilting next pin 32 by its return spring. A locking pawl‘ movement about a horizontal axis normal to the its for each wheel 25 ensures correct engagement axis of said pin, supporting means adjustably between the operating pawls ‘and the ratchet connected to said stock holder at a point spaced from said pivot means, said supporting means To raise the stock holders to a normal position 75 including a vertically arranged cam rod extend wheels. ' , 1 214112635 5 ing below said stock holder and resting upon a cam track, whereby displacement of the cam track imparts a tilting movement to said stock holder, and means actuated by the stock holder, during movement thereof to operate said pawl and ratchet means to impart a step advance to - said pin. '7. In a machine for making brushes, a pair of laterally arranged stock holders pivotally sup ported on reciprocatory carriers for tilting move ment about a horizontal axis, a pin journalled on each stock holder ‘on which a cylindrical brush stock may be secured, a cross bar connecting said 6 stock holders, means includinga cam track and vertically movable cam rod coupled to said cross bar for supporting said stock holders in di?erent positions of adjustment about their axis of tilt ing, pawl and ratchet means for imparting angu lar movement to each of said pins, means opera ble by reciprocatory movement of, said stock hold ers for actuating said pawl and ratchet means for imparting angular movement to said pins, and means for actuating said pawl and ratchet means upon displacement of said cam track to. tilt said stock holders. JAMES HALL.