US794810A - Serrating-machine. - Google Patents

Description

No. 794,810. PATBNTED JULY 18, 1905.

` R. P. MASSA.

SERRATING MACHINE.

APPLICATION FILED MAB.17,1905.

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No. 794,810. PATBNTED JULY 18, 1905.

y R. F. MASSA.

SBRRATING MACHINE.

APPLICATION FILED MAB.. 17, 1905.

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APPLIOATION FILED MAR. 17, 1905.

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No. I794,810.

UNTTED STATES l Patented July 18, 1905.

PATENT OFFICE.

ROBERT F. MASSA, OF CHICAGO, ILLINOIS, ASSIGN OR TO INTERNATIONAL HARVESTER COMPANY, A CORPORATION OF NEW JERSEY.

SERRATlNG-IVIACHINE..

SPECIFICATION forming part of Letters Patent No. 794,810, dated July 18, 1905. Application liled March 17, 1905. Serial No. 250,551.

To a/ZZ 1071/0717/ it may concern.-

Be it known that I, ROBERT F. MAssA, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Serrating-Machines, of which the followingis a complete specification.

This invention relates to the class of machines employed in imparting a serrated effect to the margins of harvester-knife Sections and the like, its application being made in this instance to a machine which serrates the cutting' edges of ledger or guard plates. Heretofore in such machines independent hammerhelves, each carrying a suitable serrating-tool, were made to operate on the cutting edges of the knife-sections; but since these serratingtools were required to move in convergent 1ines,and thus made to approach the apex of the section or ledger-plate being operated upon, interference of the tools would result if their advance was simultaneous. It was therefore found necessary to make them advance successively instead of simultaneously upon their work. In practice, however, the tool on one side of the knife-section or ledger-plate was started suiiiciently in advance of the one on the other side to permit it to complete its work and withdraw in time to prevent interference with the other hammer.

The above-mentioned difiiculties resulted'in a machine of a more complicated construction and of a lessened capacity, because the two sides of the ledger-plate or section could not be operated upon wholly simultaneously. These objections I have overcome by securing two serrating-tools of a special construction to a single hammer-helve.

Referring to the accompanying drawings, Figure l represents a plan view of a serratingmachine in which is embodied my invention. Fig. 2 is a side elevation of same, the stand or support upon which the machine is placed being omitted. Fig. 3 is an enlarged detail plan of the hammer-belve, and Fig. 4 represents a side elevation of same. Figs. 5, 6, and 7 are detail views of the base on which the ledger-plate is supported during the operation thereon, being a plan, a side elevation,

l and an end elevation, respectively. Fig. 8

represents a detail view, partly in section, of one of the stocks which hold the serratingtools. Fig. 9 represents an enlarged plan of a ledger-plate with diagrammatic views of the serrating-tools shown thereon; and Fig. 10 is a transverse section of same, taken on the plane indicated by the line 10.10 in Fig. 9. Fig. ll represents a side elevation of the spring-actuated arm for holding in position the ledger-plates, the foot-lever for operating said arm, and the connecting mechanism interposed therebetween. Fig. 12 is a front elevation of the hammer-lift and hand-lever on which said lift is mounted, the hammerhelve being shown in section; and Fig. 13 shows a view similar to Fig. 9 with the pins on the ledger-plate more clearly shown, so situated as to provide for the necessary small degree of lateral movement of the ledgerplate which is required in order to accurately adjust to the bits of the serrating-tool.

As the invention consists, essentially, in the provision of means whereby both sides of the ledger-plate are operated upon simultaneously, only a brief general description of the other parts not directly concerned will be given. For a knowledge of the detail construction and operation of a serrating-machine of the type herein shown reference is made to Patent N o. 640,529, granted to Chris Borg January 2, 1900, serrating-machine.

In the drawings, l designates the base-support, and 2 the base-plate secured to the upper surface thereof. On the base-plate 2 are fixed the longitudinally-extending guides 3, which, with said base-plate, constitute a way in which the carriage 4 is guided in its reciprocating movement. On the carriage 4 is mounted the cross-shaft 5, journaling in the bearings 6 and having secured to its projecting end the drive-pulley 7, the shaft 5 and driving-pulley moving, of course, with the carriage 4; but sincethe belt which engages this pulley leads to a shaft directly overhead the slight reciprocating movement will not materially affect the tension of the driving-belt. On the forward end of the driving-shaft 5 is rigidly secured the bevel-gear 8, which meshes with and drives the bevel-pinion 9 on the leadscrew 10. This lead-screw 10l journals in suitable bearings 11, which are fixed to the carriage 4, and engages on its under side the halfnut 12. This half-nut is fixed with respect to longitudinal movement, but provided with means for engaging and disengaging it from i riage.

the said lead-screw, it being apparent that since the lead-screw has a rotary movement whenever the half-nut engages same a longitudinal movement will be imparted to the car- As the means for actuating the halfnut 12 is not pertinent in this connection, details thereof have been omitted.

The driving-pulley 7 is provided with the clutch-teeth 7', and on the shaft 5 is feathered the clutch-sleeve 13. Pivoted in a suitable bearing on the carriage 4 at the point 14' is the clutch-engaging lever 14, and with a pivotal axis at 15 is the hand-lever 15 for controlling said clutch-lever. A link 16 connects the hand-lever 15 with the clutch-lever 14. The coil expansion-spring 17, bearing against the hand-lever 15, exerts a pressure tending to hold the clutch-sleeve 13 out of engagement with the pulley 7 as will be apparent from an inspection of Fig. 1.

In Fig. 1 the carriage 4 is shown in its farthest position forward, and to return same to its initial position or position of starting the block or half-nut 12 is depressed and the tension-spring 18 pulls the carriage back to its original position. The spring 18 is interposed between the carriage 4 and the standard 19, which rises from a rearwardly-projecting arm 19, secured to the base-plate 2.

On the forward end of the carriage 4 is pivoted the trip-lever 20, its pivotal center being at 20. A spring 21, pressing against a cam 22, which is fixed to said lever, operates to hold said lever ina definite but yielding position in relation to the carriage-frame,

this normal position being indicated by dotted lines in Fig. 1. A tappet 202 is provided on the lower end of the trip-lever 20, and when said lever is in normal position the tappet 202 engages or registers with a shoulder 152 on the hand-lever 15, thus preventing the hand-lever returning and in this manner hold the clutch-sleeve 13 into engagement with the pulley 7. A stop 23, fixed to the guide 3, is s0 situated as to be impinged by the trip-lever 20, which will move the `said trip-lever to ythe full-line vposition shown in Fig. 1, this movement disengaging the tappet 202 and shoulder 152,which will permit the hand-lever to move sufficiently to disengage the clutch 13 from the pulley 7.

Journaled slightly forward of the shaft 5 in the bearings 24 is the short rock-shaft 25, to which is rigidly secured the hammer-helve 26. On the shaft 5 is rigidly secured the tappet-wheel 27, which imparts a vibratory vmovement to the hammer-belve, the springs 28 and 29 operating to give effectiveness to the blow. The outer end of the helve 26 is provided with a double split head 26', bilaterally arranged, in which two tool-stocks 30 are securely held. These tool-stocks 30 receive the serrating-bits 31,which are secured in place by means of the set-screw 30', while the bolt 262 secures the tool-stocks firmly in position, the split head 26l enabling a tight grip to be effected. In Figs. 3 and 4 the construction of the hammer-belve and double head is clearly set forth, also the shoulders 26u and 26b of the said helve, against which bear the springs v28 and 29. This construction of the head 26 will enable the two serrating-tools to be placed closely together, as is required in operating upon ledger-plates.

In Fig. 9 will be seen the arrangement of the serrating-bits 31 and the manner in which they advance on the convergentW sides of the ledger-plate, the dotted lines indicating their position after having completed their operation on the plate.

To hold the ledger-plate in proper position while being operated upon. a small bed-plate 32 is fixed to the base-support 1, and on this plate is adjustably secured the ledger-plate holder 33. The upper surface of the ledgerplate holder is formed on an angle, as shown in the several figures, and is provided with the pins 33 at its upper end and the pin 332 at its lower end, the function of which is to secure the ledger-plate against lateral movement. As the ledger-plate is narrower at its upper than at its lower end, it follows that since the serrating-tools have the engaging edges of their bits angularly inclined (see Fig. 10) t0 correspond .with the angle of the margin of the ledger-plate thehammer would drop lower'before engaging its work. Hence to preserve a uniform length of stroke of the hammer-belve the upper surface of the plateholder 33 is formed on the angle, as shown.

To firmly hold the plate down on the plateholder during the operation, a spring-actuated arm 34, with its pivotal axis formed by the rock-shaft 34, is provided. A rearwardlyextending arm 342 is rigidly secured to the end of the rock-shaft, the end of this arm connecting with a link 343, which engages with a suitable foot-lever 344, such as shown in Fig. 11, and within convenient reach of the operator. A compression-spring 35 reacts between the base-support 1 and the rearwardly-extending arm 342, which operates to press the arm 34 firmly down on the ledger-plate.

The ledger-plate holder 33 is symmetrically arranged with respect to the hammer-belve 26, so that both sides of the said plate will receive their serrations uniformly and simultaneonsly.

To raise the tools from their work an amount sufficient to permit the withdrawal of the ledger-plate when finished, a hammer-lift 36 is secured to the upper side of the hand-lever 15, (see Fig. 12,) this hammer-lift being so IOO IIO

arranged that when the clutch mechanism is thrown out the movement of the said leverl, carrying with it the hammer-lift 36, will cause the latter to crowd under the hammer-belve and lift the same.

In Fig. 12 the dotted lines indicate the position of the hammer-belve 26 before it has been engaged by said lift 36, while the full lines show the position after engagement. rIhe engaging side of the lift is shown beveled to enable it to more readily crowd underneath the said helve. l

The operation of the device is as follows: rIhe arm 34 is raised through the rock-shaft 34', the arm 342, and the link 343, connecting with a foot-lever, (not shown,) and by means not shown, but preferably actuated by the same lever, the half-nut 12 is depressed, permitting the spring 18 to draw the carriage 4 back to its initial position, the clutch being out of engagement, as shown in Fig. 1. The operator, with his foot yet on the lever, then removes the ledger-plate just operated upon and places a new blank on the ledger plate holder 33 and within the pins 33 and 332. The foot-lever is then released, allowing the arm 34 to press against the ledger-plate and the half-nut 12 to engage the lead-screw 10. The handle of the lever 15 is then moved to the right or toward the lead-screw, thus engaging the clutch-sleeve 13 with the drive-pulley 7. This movement of the lever 1.5 will also cause the shoulder 152 to release the trip-lever 2O and permit it to take the position indicated by dotted lines in Fig. 1, it being remembered that the carriage is now in its returned position, and hence the stop 23 does not interfere with the said trip lever. As soon as the clutch is engaged the carriage will at once begin to advance, the hammer-helve 26 being rapidly vibrated by the tappet-wheel 27. The bits 31 are set to make the serrations at the proper angle, as will appear from an inspection of Fig. 9. The inclination of the engaging edges of the bits is such as-to conform to the bevel of the ledger-plate, and hence room will vbe .left above said plate for the reception of the arm 34, as will be made clear by reference to Fig. 10. Concurrently with the serrating-tools reaching the narrow end of the ledger-plate the trip-arm 20 will have impinged the stop 23, moving said trip-arm to theposition shown by full lines in Fig. 1.

l This will cause the tappet 2()2 to no longer lows that any slight variations in the size of the ledger-plate or any slight variation inits position upon its support will result in one bit of the serrating-tool striking harder on one side of the ledger-plate than on the other and possibly prevent contact on one side altogether. rIo avoid such consequences, the ledger-plate is held in such a manner as to bev slightly movable laterally, which will permit it to adjust itself to the rigidly-held tool.

In Fig. 13 is shown the ledger-plate holder 33, the pins 33/ and 332 mounted thereon for securing the ledger-plate against lateral movement, and the ledger-plate resting therein. It will be seen that the pin 332 is of a diameter somewhat less than. the diameter of the circular sector into which it lits, while the pins 33 do not fit closely against the tongue of the ledger-plate. In this manner suflcient provision is made for the slight amount of lateral movement required.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. In a serrating-machine, in combination, a vibrating hammer, bilaterally-arranged serrating-tools secured to said hammer for acting simultaneously on both sides of the ledgerplate, means for holding in position the said .ledger-plate While being operated upon, actuating means for said hammer, and means for producing a relative feeding movement between the serrating-tools 4and ledger-plate.

, 2. In a serrating-machine, in combination, a reciprocating carriage, a vibrating hammer mounted thereon, bilaterally-arranged serrating-tools secured to said hammer, actuating mechanism for said carriage and hammer,

IOO

and means for securely holding in position the piece being operated upon.

3. In a serrating-machine, in combination, a reciprocating carriage and a single hammer mounted thereon, means for reciprocating said carriage and for actuating said hammer, two serrating-tools bilaterally arranged on the free end of said hammer for acting simultaneously on both edges of the ledger-plate, and means for holding in position theledger-plate operated upon.

4. In a serrating-machine, in combination, a reciprocating carriage, avibrating hammer mounted thereon, bilaterally-arranged serrating-tools secured to the free end of said hammer and advanced thereby in a direction longitudinal of the ledger-plate and angularly with respect to the margin thereof, actuating mechanism for the said reciprocating carriage and hammer, and means for securely holding in position the ledger-plate operated upon.

5. In a serrating-machine, incombination, a reciprocating carriage, a vibrating hammer IIO IZO

mounted thereon, bilaterally-arranged serrat- ISO arranged to lie upon theledgcr-plate beneath riage and hammer, and a ledger-plate holder 10 the upwardly-inclined engaging' edges of the inclined upwardly toward its narrow end for serrating-tools for holding said ledger-plate securely holding in position the plate being in position while being operated upon. Operated upon.

6. In a serrating-machine, in combination, a reciprocatingcarriage, avibrating hammer ROBERT F MAbSA mounted thereon, two hilaterally-arranged Witnesses: A serrating-tools secured to the free end of said MARGARET A. vSWEENEY, hammer` actuating mechanism for said car- J. C. WARNES.

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