US1518844A - Brush-making machine - Google Patents

Description

Dec. 1924- 1,518,844

0. E. FISHER BRUSH MAKING MACHINE Original Filed Jun 21, 1921 s Sheets-Sheet 1 Dec. 9, 1924. 1,518,844

c. E. FISHER BRUSH MAKING MACHINE Original Filed June 21-, 1921 3 Sheets-Sheet 2 inventor;

0. E. FISHER BRUSHMAKING MACHINE Original Filed June 21, 1921 3 sheets-sheet a 6113501 nag Patented Dec. 9, 1924.

UNITED STATES PATENT OFFICE.

CHARLES EDWARD FISHER, OF BALTIMORE, MARYLAND, ASSIGNOR TO THE FISHER AUTOMATIC BRUSH MACHINE COMPANY, INC., OF BALTIMORE, MARYLAND, A GOR- IORATION F MARYLAND.

BRUSH-MAKING MACHINE.

Original application filed June 21, 1921, Serial No. 479,253. Divided and this application filed June 24,

' 1924. Serial No. 722,011.

T 0 all whom it may concern Be it known that I, CHARLES E. FIsHnn,

a citizen of the United States, residing at Baltimore, in the State of Maryland, have invented certain new and useful Improvements in Brush-Making Machines, of which the following is a specification.

This invention relates to improvements in machines for making brushes, such as 0 scrubbing brushes. The general type of machine to which the improvements are applicable is well known, and comprises a pair of tables adapted to hold wooden blocks shaped to form brush backs, a boring tool arranged over one table, and stapling mechanism for applying tufts to the blocks arranged over the other table, means for operating the boring tool and stapling mechanism simultaneously and intermittent- 1y to bore holes in one block. and apply tufts to previously bored holes in the other block, and means for automatically shifting the tables to position the blocks so that the holes will be bored in one block in accordance with a predetermined pattern while tufts are secured in the holes in the other block, previously bored according to the same pattern.

In my co-pending application, Serial Number 479,253, filed June 21, 1921, of which the present application is a division, I have shown and described in detail a machine of the type referred to. The present application relates to the table shifting 35. mechanism, and particularly to the means for resetting the table frame in its initial or starting position, and to means for counterbalancing the table frame.

In the accompanying drawing,

Fig. 1 is a front elevation of the ma-,

chine, with various parts removed;

Fig. 2 is a top plan view of the table frame and operating mechanism;

Fig. 3 is a section on the line 3-3 of Fig. 2; I

' Fig. 4 is a detail view illustrating the operation of the detent on the cam wheel which moves the table forwardly;

Fig. 5 is a section on the line 55 .of 6 Fig. 2; and

Fig. 6 is a detail view showing the eccentric for operating the mechanism which moves the cam shaft.

Referring to the drawing, A indicates the frame of the machine comprising a bed or table a, supported by legs a, and an arched frame a comprising parallel uprights 1 and 2, secured'to the bed at its ends, and a cross-piece 3 mounted upon the uprights. A main shaft 4 is mounted in bearings at the back of the legs a, and this shaft is maintained in constant operation by power applied to a pulley 5 on the shaft. The main shaft is provided with a sprocket wheel 6, which is connected by a drive chain 7 to a sprocket wheel 8, revolubly mounted upon a clutch shaft 9. which is supported in suitable bearings on the upper part of the frame." This sprocket wheel drives a clutch (fully illustrated in my original application, and unnecessary to illustrate here) which operates the shaft 9, and this clutch may be tripped and disengaged from the shaft by a tripping lever 10. This lever is movable to the tripping position by a spring 11; but it is held out of the tripping position while the brush blocks are being bored and tufted by a spring-pressed latch 12, pivoted on a fixed arm 13. By rocking the latch against the action of its spring 14, the tripping lever will be released and will be drawn in the direction to trip the clutch and stop the shaft 9 by the spring 11. When the tripping lever is moved in the opposite direction, that is, to the left in Fig. 1, it will be caught and held by the spring latch and the shaft 9 will be driven by the clutch.

The latch 12 is automatically tripped, to release the clutch mechanism and stop the machine, when the final tuft has been applied to a brush block, by means of a rod 15, connected to the latch lever and to a tappet lever 16, the latter being arranged in the plane of movement of a'tappet arm 17 on the cam shaft B of the machine. At.

the completion of each revolution. of the cam shaft, the tappet arm rocks the tappet 1 and the clutch is thereby released.

Secured to the clutch shaft 9 is a hand wheel 18, by means of which the cam shaft and the entire mechanism can be turned by hand for the purpose of adjustment or repairs, when desired, and upon the hand wheel is secured an adjustable bracket 19, carrying a crank pin 20, which may be adjusted by the bracket toward and from the aXis of the clutch shaft so as to vary the eccentricity of the crank pin. Secured to the bracket 19 is a rod 21, which is given a reciprocating motion by the crank pin and operates a mechanism for giving a step-bystep movement to the cam shaft, which is journaled in brackets a a, and a, which project rearwardly from the bed plate a of the machine. The step-by-step mechanism operated by the rod 21 is mounted upon the bracket a and comprises a ratchet arm 22, pivotally connected to the lower end of the rod 21 and journaled upon a shaft 23 in a support 24, which is integral with the bracket. The ratchet lever carries a spring pawl 25, which engages a ratchet wheel 26, secured to the shaft 23, and upon said shaft is secured a spur gear 27 which, through intermediate gearing, g, more particularly described in my original application aforesaid, operates the cam shaft B.

The cam shaft B carries three spiders or disks 28 29 and 30* to which are secured sectional cam rings 28, 29, and 30, respectively, which co-operate, through mechanism to-be described, to adjust two brush supporting tables 0 and a so that the brush backs, which are carried thereby, may be properly positioned to be operated upon by the borin and stapling mechanisms. As shown in ig. 1, the table 0 is directly beneath a drill spindle 31, carrying a drill 32, and the table 0 is similarly located with respect the stapling mechanism, a guide for which is shown at 33.

' The brush holders or tables 0 and 0 are upon the ends of forked levers 34 and 35, respectively, which levers are pivoted adjacent the tables upon pivot pins 36 to the upper part of a frame C, which is mounted so that it may be moved vertically and also rocked forwardly and backwardly. The levers 34 and 35, supporting the brush tables, may be rocked laterally about their pivots 36 with respect to the frame, as shown in Fig. 5. The frame C has two depending legs 37, which are centrally pivoted at 38 to dove-tailed bars 39, which are movable in vertically arranged guides 40, secured to the bed plate a.

The frame 0, carrying the tables 0, 0, is movable vertically by a rocking frame 41, which is centrally pivoted upon trunnions 42- and carries at its rear end a roller 43, which is engaged by the cam wheel 30. The forward end of the rocker supports the vertically sliding bars 39 to which the legs 37 of the frame C are pivoted. It will be evident that any rocking movement imparted to the rocker 41 by the cam 30 will cause the frame C to be raised or lowered. The cam surface is so formed that the parts of the brush blocks immediately beneath the drill and stapling device will always be at the same height.

The cam 29, which has a snail form,

arm 47 which projectsupwardly from the top of the frame C. A hand piece 47 is attached to the arm 47, for moving the table frame by hand to re-set it' in its rearward tilting position, as hereinafter described. The roller is held in engagement with the cam by a weight 48 which is connected to the lever by a flexible cable 49 passing over the cam shaft. As the table tilts forwardly from its central position more tension is required on the cable to hold the lever so that its roller will bear on the cam, and when the table is moved to the rear of its central position, less tension on the cable is required to hold the roller against the cam. To apply more tension, I provide a compensating spring 50 above the weight which is compressed by the latter against a stop 51 as the table tilts forwardly beyond its central position, and to apply less tension to the cable, I provide a compensatmg spring 52 below the weight which relieves the cable of an increasing amount'of the weight as the table is moved rearwardly from its central position.

Mounted on the cam 29 adjacent its high end 29- is a pivoted detent 53 which is normally held in a more or less radial position by a spring 54, as shown in full lines in Fig.

3, and in dotted lines in Fig. 4, but as the .high end of the cam is passing the roller, the

latter engages the detent and rocks it about its pivotal point until the longer. arm of the detent rests against a stop pin 55 and the shorter arm projects beyond the high end of the cam, as shown in full lines in Fig. 4, and forms a continuation thereof, which prevents the roller on the lever from dropping immediately to the low end of the cam. When the roller rests upon the detent, as shown in Fig. 4, the stop mechanism before described operates and the entire machine comes to rest. This occurs at the time when the last hole has been bored in one brush block and the last tuft has been secured to the other brush block, and the brush tables are in their extreme forward positions. To reset the tables in their rearmost positions, for the next operation, the operator pulls of the handle 47 and this pul s the lever 45 i to the left hand dotted position in Fig. 4,

a roller 61 on the slide.

and the roller 44 is moved out of engagement with the detent, which springs to the radial position indicated in dotted lines in Fig. 4. The operator then allows the tables to be pulled backwad by the weight, and as the detent is now out of the path of movement of the roller, the roller will pass to the lowest point on the cam, as indicated by the dotted lines at the right in Fig. 4, and the tables will be tilted backward so that the drill and staplin devices may commence to operate on the forward ends of the brush blockswhen the machine is again started.

To effect lateral spacing of the holes and tufts in the brush blocks, the levers 34 and 35, which carry the brush block tables, are pivotally connected at their lower ends to a horizontally movable frame 56, and the lower ends of the levers 35 are connected cto the pivotal points of the levers 34 by diagonally arranged springs 57, which normally tend to cant the levers and the tables 0, c, to the left, as shown in Fig. 5. The frame 56 has a cross-bar 56 which is held in engagement with an upright tapering pin 58 by the springs 57. This pin is mounted upon a bell crank lever 59, the shorter arm of which is connected by a link 60 to a slide 61, which is movable forwardly and backwardly by'the cam wheel 28, which engages The roller is held in engagement with the cam wheel by the tension of the springs 57, acting through the medium of the parts just described, and it will be evident that as the roller is pressed forwardl by the cam wheel, the pin 58 will be rocked so as to swing the frame 56 to the left, in Fig. 5, and thereby rock the tables 0, c, to the right. When theroller 61 enters a depression in the cam wheel, the frame 56 will be allowed to move to the right, in Fig. 5, and the tables will be moved to the left by the springs 57.

The operation is as follows: Normally the brush tables are in the forwardly inclined position, and the roller 44, on the lever 45, rests upon the detent 53 on the cam wheel 29, as illustrated in Fig. 4. A block! to be bored is placed uponthe table 0, and a. block which has previously been bored on the table a is placed on the table a. The operator then ulls the table frame forwardly, so that the etent can spring out of line with the roller on the lever 45, and then allows the table frame to be pulled backwardly by the weight until said roller rests on the low part of the cam 29. In this position of the tables, the forward ends of the brush blocks are beneath the boring tool and stapling mechanism and areinclined so that the holes bored and tufts set will be inclined with re spect to the faces of the brush blocks. The

operator then moves the clutch lever to the left, in Fig. 1, until it is engaged-by the latch 12, and this movement causes the clutch shaft to be connected to the constantly driven shaft 4. The boring and staple driving devices then-make a, downward and up ward movement at each revolution of the clutch shaft, and at each downward movement a hole is bored in one block and a tuft is stapled into a correspondingly located hole in the other block. A step by step movement is given to the cam shaft between successive operations of the boring and stapling devices, and two of the cam wheels 28 and 29, on said shaft, cause'the tables carrying the brush blocks to be shifted so as to space the holes and tufts according to a pattern predetermined by the form of the cam surfaces on' said cam wheels. Thus, the cam wheel 28, which causes lateral shifting of the brush tables efi'ects lateral spacin of the holes and tufts, while the cam whee 29, which rocks the tables forwardly, eflects longitudinal spacing of the holes and tufts. The cam wheel 30, which causes vertical movement of the tables, adjusts the tables so that the brush blocks, at the points immediately under the drill and staple driving mechanism will always be at the same height. During one complete turn of the cam shaft, the tables carrying the brush blocks are rocked step by step from a backwardly inclined position to a forwardly inclined position, and the one block is bored with a full complement of holes while the other block is completely tufted, and near the end of the revolution of the cam shaft, the tappet arm 17 thereon engages the tripping lever 16 which is connected to the latch 12 on the clutch mechanism and this latch is moved to release the clutch and thereby cause stop- "allow the detent on the cam 29 to swing out of line with the roller on lever 45, and then allows the table frame to rock back to the startingl position in which said roller engages t lever is then moved b hand to. start the machine and the operations before described are repeated.

What I claim is:

1. In a brush-making machine, the combination with a table-frame having thereon tables for supporting brush blocks, of means for adjusting said table-frame forwardly comprising a cam shaft, a snail cam thereon, a detent on the higher end of said cam and normally projecting radiall beyond" its surface, a member movable wit the table-frame and having a part bearing on the cam and adapted to rock the detent so that the latter e low part of said cam. The clutchv will project over the low end of the cam, and means for automatically stopping the movement of the cam when said part rests on said detent.

2. In a brush-making machine, the combination with tables for supporting brush blocks, a tiltin frame for said tables and means for rocking said frame forwardly comprising a cam wheel, a lever having a roller bearing on said wheel and a link connecting the lever with'the table frame, of means for rocking the tables backwardly comprising a weightadapted to slide vertically, a cable connecting the Weight with the frame, and springs adapted to be compressed by the Weight near the limits of its movement.

3. In a brush-making machine, the combination with tables for supporting brush blocks, a tiltin frame for said tables and means for rocking said frame forwardly comprising a cam wheel, a lever having a roller bearing on said wheel and a link conframe, and means for increasing the tension on the cable when the weight approaches the upper limit of its movement. a

p 4:. In a brush-making machine, the combination with tables for supporting brush blocks, a tilting frame for said tables and means for rocking said frame forwardly comprising a cam wheel, a lever having a roller bearin on said Wheel and a link connecting the ever with the table frame, of means for rocking the tables backwardly comprising a weight adapted to slide vertically, a cable connectin the weight with the frame, and means for ecreasing the tension on the cable when the weight approaches the lower limit of its movement.

In testimony whereof I hereunto aflix my signature.

CHARLES EDWARD FISHER.

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