US2084345A - Tuft setting anchor and apparatus for forming and applying the same - Google Patents

Description

June 22, 1937. c, O T

'lfUFT SETTING ANCHOR AND APPARATUS FOR FORMING AND APPLYING THE SAME Original Filed Sep t. '2, 1950 s SheetsSheet 1 llll l I I ll INVENTOR Q7zraci Jobs t firm/M 41M ATTORNEY-9' c. JOBST 2,084,345 TUFT SETTING ANCHOR AND APPARATUS FOR FORMING AND APPLYING THE SAME June 22, 1937.

Original Filed Sept. 2.,- 1930 3 Sheets-Sheet 2 llll... a

INVENTOR (anraaf J ,sz 7' 10mm il m ATTORNEY- June 22, 1937. c. JOBST 2,084,345

TUFT SETTING ANCHOR AND APPARATUS FOR FORMING AND APPLYING THE SAME Original Filed Sept. 2, 1930 3 Sheets-Sheet 3 4 [0 G 1 6/ TL IEWJIIIL- LC) Q 0 5 0 -c 1'7 71; Car/rec? Jaz f BY W l- I v ATTORNEYS Patented June 22, 1937 PATENT OFFICE TUFT SETTING ANCHOR AND APPARATUS FOR FORMING AND APPLYING THE SAME Conrad Jobst, Toledo, Ohio, assignor to The Toledo Automatic Brush Machine Company, Toledo, Ohio, a corporation of Ohio Application September 2, 1930, Serial No. 479,371 Renewed October 6, 1934 15 Claims.

The invention relates to the manufacture of brushes such for instance as tooth brushes and of that type in which the tufts are secured in the bores inthe brush back by so-called anchors.

These anchors are usually stamped from sheet metal and are of various forms but usually provided with a straight edge for engaging the bristles of the tuft, with a V-shaped notch in the opposite edge forming prongs which during the setting of the tuft are laterally expanded intothe sides of the bore to prevent disengagement.

One'of the objections to the setting of tufts by this method is that as the anchors are very small, it is exceedingly diflicult to feed them into 1-5-engagement with the tufts in the short interval of time allowed for this operation. Other objections are that the anchors being sheared from sheet metal present sharp edges which frequently cut-the bristles in contact therewith. Thus in 20 comparison with the setting of the tufts by certain other securing devices, such for instance as round wire staples, the anchor method is neither as satisfactory as a securing means nor capable of as high a rate of production.

.It is the object of the present invention to obtain a construction of anchor and a method of forming and setting the tufts with the same which is capable of a high rate of production on automatic machines. It is a further object to obtain an anchor which has a rounded edge in contact with the bristles so as not to injure the same and one which can be made exceedingly small in dimensions, particularly in depth so as to be applicable tothe setting of tufts in very thin brush backs. This latter feature is of great commercial value in the manufacture of tooth brushes with celluloid handles, as the cost of this material is a large factor in the total cost of the brush; With these objects in view the inven- 40; tion consists in the novel construction of anchor and method and apparatus for setting the tufts in the same as hereinafter set forth.

-In the drawings:

Figure 1 is a side elevation of a tuft setting s, mechanism in which my improvements are' applied; 1

Figure 1A is an enlarged view of a portion of Figure 1 shown partly in section;

Figure 2 is a sectional plan view thereof;

Figure 3 is a front end elevation;

Figures 4 and 5 are sections substantially on line 4-4 of Figure 3, illustrating in different positions the mechanism for notching the anchors;

Figure 16 is an enlarged elevation of a portion of re an Figure '7 is a cross section thereof on line 'l-'I of Figure 6;

Figure 8 is a bottom plan view of the parts shown in Figures 6 and '7;

Figure 9 is an enlarged perspective view of one of the anchors detached;

Figure 10 is an enlarged cross section through the brush back showing the anchor in position in one of the tuft receiving bores;

Figure 11 is an enlarged elevation of the anchor strip as shown in Figure 6 showing in full lines a severed anchor and in dotted lines the portion of strip from which it is severed and also showing a driver in initial engagement with the severed anchor such as to change the same in driving to the form shown in Figure 10.

A is a: recip-rocatory nozzle of a tuft setting mechanism having a lateral slot B through which the bristles are introduced after first being separated and delivered from the mass by suitable mechanism (not shown). C is the central longitudinal channel in the nozzle through which the bent or folded bristles are passed and introduced into the registering bore of a brush back, and D is a reciprocatory driver for pushing the bristles through this channel. All of these parts may be through the channel C into the bore'in the brushv back where it is laterally expanded into the sides of the bore to prevent disengagement. As above described, it is exceedingly difiicult to feed elements as small as these anchors so as to suc cessively register them with the driver and without danger of clogging or interfering with each other. I have eliminated the difficulty by substi-' tuting for the separate anchors a continuous strip which is fed into the nozzle and from which the anchors are successively sheared and deposited directly in the'path of the'driver. This method has the further advantage that the continuous strip from which the anchors are sheared can' be formed with a rounded edge which forms the contact with the bristles, the sheared edges being imbedded in the side walls of the bore. 'Also by this method the notching of the anchors toform the laterally separable prongs can be accom--' plished at a point adjacentto the nozzle and beyond the feed mechanism for the strip. This. insures very accurate forming and positioning of,

the anchors and also greatly facilitates the feeding of the strip which in its imperforate portions has no tendency to bend or skew.

The method above described can be carried out by a simple construction of mechanism as follows: E is the strip or ribbon for forming the,

anchors which has a width considerably in excess of its thickness and suitable for the depth of the anchor. This strip is fed laterally into the nozzle by means of feed rollers F and F which are intermittently actuated by a ratchet wheel G and a latch pawl H, the latter being carried by a bell crank lever I which in turn is actuated by a reciprocatory slide J, bell crank lever K and cam L. The cam L may be mounted on a shaft M which is also provided with cranks M M for actuating the nozzle and the driver. The strip E after passing the feed rolls F F extends through a guide N which directs it laterally into the nozzle A in rear of the bristles entering the slot B. The plane of the feed of the strip is, however, slightly off-set from the plane of the channel C and a shearing member is located with its shearing edge in the horizontal plane of the bottom of said channel C. A co-operating movable shearing member P which is of a width equal to the width of the anchor is normally spaced from the member 0 for the feeding of the strip therebetween and subsequently is moved to shear the anchor E from the strip E and simultaneously move it into the plane of the channel C so as to be in the path ofthe driver D. This member P also forms one wall of the channel C after the anchor is sheared which in cooperation with the opposite wall Q will accu rately hold the anchor in the path of the driver. Thus the anchor when severed from the strip can not become misplaced, but is positively transferred into the path of the driver and held in alignment therewith during the driving operation. The anchor when advanced by the driver into the nozzle passes between plates C and C which have grooved edges C for engaging and guiding the opposite ends of said anchor holding it in alignment with the driver until delivery from the end of the nozzle into the registering bore in the brush back. I

The notching of the anchors is accomplished at a point intermediate the feed rolls F F and the upper end of the anchor strip E. This notching is preferably accomplished by a pair of co-operating shear members R and R. The shear member R is in the form of a'peripherally V-shape grooved disk which has a notch or cut away seg ment presenting a shearing face R with a V- shaped notch therein. The member R has its peripheral portion of a cross section to fit in the V-shaped groove in the member R and is also notched or cut away to present a shearing face R opposite to the face R The member R may be clamped in position by a clamping bolt S but the member R is mounted on a rock shaft S journalled in a bearing in the guide N. This rock shaft is intermittently actuated through the medium of a rock arm S v which-extends laterally into a recess T in the housing T which latter forms the guide for the reciprocatory nozzle. It is to be understood that all of the parts of the strip feeding mechanism are mounted on the shank A of the nozzle A so as'to maintain a fixed relation thereto, but during movement of the nozzle in its housing T the rock, arm 5 will alternately contact with shoulders T and T at opposite ends of the recess T. Thus at a certain point in the movement of the nozzle the rock arm S will rock the member R so as to cause the shearing face R to shear a notch inthe strip and enter the V-shaped groove inthe member R. While thus engaged the strip is' firmly held against longitudinal movement at which time the shearing of the anchor from the strip occurs. erably in the form of a lever pivoted at P and having its outer edge cammed at P -and P to co-operate with cam faces in the housing member T so as to rock said lever at a certain point in the movement of the nozzle. All of these parts are so timed that the shearing of the anchor from the end of the strip and the movement of the same laterally into the path of the driver occurs slightly in advance of contact of the anchor by said driver and subsequent to the feeding of the bristles through the slot B into registration with the channel C. Thus the following movement of the driver will force the anchor against the bristles and into engagement with the grooved guides C carrying the folded tuft through the nozzle and into the registering bore in the brush back. The end of the'driver is so shaped that at the completion of the driving movement it will spread the prongs of the anchor laterally, imbedding them in the side Walls of the bore so as to securely hold them from disengagement.

The above described mechanism is capable of high speed operation, for'all of its parts are positively actuated in accurately timed relation while the anchor and the bristle tuft are. accurately guided during movement thereof. By reason of this it is possible to use anchors which are smaller, particularly in the dimension of depth, than constructions that have heretofore been used, so

that the brush backs may becorrespondingly re-* duced in thickness with the saving of expensive material. All sharp edges. produced by shearing the brush per se in this application, as this forms the subject matter of another patent. I

What I claim as my invention is: 1. In a tuft setting mechanism, the combine application for tion with a nozzle for receiving the tuft, and a" driver in rectilinear alignment therewith, of means for feeding a continuous flat ribbon strip laterally into said nozzle out of alignment with said driver and means for shearing an anchor' The shearing member P'is pref-' from the end portion of said strip into the path of said driver.

2. In a tuft setting mechanism the combination with a nozzle for receiving the bristle and a driver, of means for intermittently feeding a continuous strip laterally into saidnozzle in a plane spaceda reciprocatory driver, of mechanism carried by said nozzle for intermittently feeding a strip thereinto and in a plane spaced from the plane of the driver, means for notching the strip atone point during the interval of rest of said intermittent feed, and means for shearing an anchor from the end portion of said strip and moving the same into the plane of said driver while said strip is locked by the notching means.

4. In a tuft setting mechanism, the combination with a nozzle for receiving the bristles, and a driver, of means for intermittently feeding a continuous strip laterally to said nozzle in a plane spaced from the plane of the driver, a shearing member movable to sever the end portion of said strip and to carry the same into the plane of the driver, said member constituting a guiding wall for holding the severed anchor in the path of the driver.

5. In a tuft setting mechanism, the combination with a nozzle for receiving the bristles, and a driver, of means for intermittently feeding a continuous strip laterally into said nozzle in a plane spaced from the plane of the driver, a stationary shearing member adjacent to the plane of feed with its shearing edge located in the transverse plane of one edge of the driver, a cooperating movable shearing member 'normally spaced from said stationary shearing member for the feeding of the end of the strip therebetween, and means for moving said movable shear member to sever an anchor from said strip, carrying the same into the plane of the driver, said movable shearing member also constituting a guiding wall for holding the anchor in the path of the driver.

6. In a tuft setting mechanism, the combination with a reciprocatory tuft setting nozzle adapted to receive the bristles for the tuft and a reciprocatory driver, of mechanism carried by said nozzle for intermittently feeding a strip thereinto and in a plane spaced from the plane of the driver, guides forming off-set channels through which said strip and said driver are respectively moved, said channels having an interconnecting portion and a shearing member movable in said inter-connecting portion to sever an anchor from the end of the strip and to carry the same into the plane of the driver.

7. In a tuft setting mechanism, the combination with a reciprocatory tuft setting nozzle adapted to receive bristles for the tuft, a reciprocatory driver within said nozzle and a station-.

ary guide in which said nozzle reciprocates, of mechanism carried by said nozzle for intermittently feeding a strip thereinto and in a plane spaced from the plane of the driver, a shearing member carried by said nozzle for severing the end portion of the strip and moving the same into the plane of the driver, and means on said stationary guide for actuating said shearing member by the relative movement of said nozzle.

8. In a tuft setting mechanism, the combination with a reciprocatory tuft setting nozzle and a reciprocatory driver, of mechanism carried by said nozzle for intermittently feeding a strip thereinto comprising intermittently actuated feed rolls for advancing the strip, a guide for holding the advancing strip in a plane spaced from the plane of the driver, notching means for said strip While in said guide and shearing means for severing the end portion of said strip and for moving the same into the path of the driver, a stationary guide for the reciprocating nozzle and means on said stationary guide for actuating said notching and shearing means during the reciprocation of the nozzle.

9. An anchor strip for use in tuft setting mechanisms provided with parallel edges, one of which is rounded and a series of notches in the opposite edge between which a strip maybe sheared to form individual anchors.

10. An anchor for securing a folded bristle tuft in the bore of a brush back having a. smooth laterally extending edge for engaging the fold in the bristle tuft, parallel longitudinally extending edges of smaller dimension than said laterally extending edge for embedding in the opposite walls of said bore and a V-shaped notch in the edge opposite to said laterally extending edge whereby, after insertion, the notched edge is expanded into the sides of the bore.

11. An anchor strip for a tuft setting mechanism for a brush making machine provided with parallel edges and a series of notches ,in one of said edges spaced by a dimension greater than the distance between said edges, said strip having a substantially straight end edge forming one side of an individual anchor, said strip being adapted to be sheared successively between said notches to successively form a series of individual anchors.

12. In a method of setting tufts in brush backs, the steps comprising intermittently feeding a continuous strip laterally into the tuft setting nozzle in a plane spaced from the path of the driver and, during each interval of rest, shearing an anchor from the end portion of said strip and carrying the same into the path of the driver.

13. In a method of setting tufts in brush backs,

the steps comprising feeding a continuous strip having a series of notches therein into a tuft setting nozzle in a plane spaced from the path of the driver, moving a shearing element transversely to said continuous strip and transversely to the path 'of said driver, thereby shearing the end portion of said strip at a point intermediate successive notches and carrying. the anchor so formed into the path of the driver with the sheared edge extendingin the direction of movement of said driver, moving said anchor through the path of said driver into a brush back, and spreading the side portions of said anchor on opposite sides of said notch to embed the same into the brush back.

14. In a tuft setting mechanism, the combination of a nozzle for receiving the tuft, a driver in rectilinear alignment therewith, means for feeding a continuous fiat ribbon strip into said nozzle out of alignment with said driver and means for shearing an anchor from the end portion of said strip and moving the same into the path of said driver.

15. An anchor for securing a folded bristle tuft in the bore of a brush back, said anchor before driving having a smooth laterally extending edge for engaging the fold in the bristle tuft and of a dimension substantially equal to the diameter of said bore, parallel longitudinally extending edges of smaller dimension than said laterally extending edge and at right angles thereto, a substantially V-shaped notch in the edge opposite said laterally extending edge and with a portion between the inner end of said notch and bristle engaging edge of a dimension less than the depth of the notch whereby in driving the portion at the inner end of said notch will be bent and the portions on opposite sides of said notch will be expanded with their outer edges diverging in a directionoutwardly of said bore and with their outer corners embedded in the side walls of the bore.

CONRAD JOBST.

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