US2576699A - Pantographic marking machine - Google Patents

Description

Nov. 27, 1951 B. w. SCHABOT 2,576,699

PANTOGRAPHIC MARKING MACHINE Original Filed Oct. 15, 1943 5 Sheets-Sheet l INVENTOR jmxdill wh A ORNEYS B. W. SCHABOT PANTOGRAPHIC MARKING MACHINE Nov. 27, 1951 v s Sheets-Sheet3 Original Filed Oct. 15, 1943 INVEN OR Y fi l- \TT RNEYS.

Patented Nov. 27, 1951 UNITED STATES PATENT OFFICE TOGRAPHIC MARKING MACHINE Bernard W: Schabot, Fcmd'ale, Mich- Original application October 15, 1943,, SerialNo.

506.357; DiVit 1d and this'application Septem- Ber 11, 1946; SI'iZI NO. 695234 This invention relates to a pantographicmarh ing machine.

Marking machines are usually single purpose machines, that is, they are adapted for the marking'of a single type of tooror article.

This invention contemplates: 21 oantograpine marking machine which is universally adapted to the accurate'marking"of'any object irrespec= tive of size.

It is an object or this invention-to produce a p-antographio marking machine which is siinrile in structure, each to manipulate and accurately reproduces the marking desired.

It is also an object of thisiinvention to produce apantographic. marking machine in which the typecan be set or changed easily.

This invention contemplates a pantograonic marking machine which" is universal inits type of marking, i. e'., one can use any type or scribing instrument in said machine; e. g, a diamond scriber, a rotary engraver, an electric pe'ii'c'il, a vibrating marking tool. Further, the machine can be used for marking on any material and either directly on the object to" be marked or through a coating such as p araffi'n preparatory to etching themark in the'object. v

Fig. 1' is a top plan view of the p-antog'raphic' Fig. 6a is a sectional View of the ieceof'type shown in Fig. 6.

Fig. '7 is a section along. the line"i--T of Fig l 3'. Fig; 8 is a detailed elevation of the pantograpn and tracing pen.

Fig. 9is a section alongv the line 9-9 of -Fig. 8'.

Fig. 10 is a section along the Tine" lo ic of" Fig. 3'.

Fig. 141 is a top lan-view of the Work table.- Fig. 12 is an end elevation or the worktame.- Fig.1}? is a detailo'f one oi'tne screw members of the Work table;

Referring more particuianly to the drawings it will be seen that the marking machine comprisesa post i upon which is supported ior'verticai adjustment 2; support arm 2*foi-the-w01 k tabl'3. This permitsone' to mark work of different sizes, such as tools and dies. The type is setup on the type assembly table ll also mounted on post I.

The pantographzsupport arm v 6 has one" 'ndl tween eoiianzsand arr'rrtflto -y'ieldablir hold-the".

3 claims. (01. 33-45) 2 in the form of a split sleeve which is vertically adjustable on the nest I. The pantograp'hsum poi-term can also be swung to any position-about thpost' l and t en locked by means of the ded' handle 5" which tightens the support sleeve for arm 6 on the post I.

The work table support arm 2 15 nroviiiedwith alocatin grooveor liner and-the post I is" provideo with a corresponding line 3. The work table is provided" with a locating line 9 and the vvorletabiesupport arm is provided with a locatingline In. Lines 5 and: it must be in a1ignmerit and lines 1 and a must also oe'in a1ig nflient loefore the work is marked, otherwise the marking will run asla'nt of" the article being marked. Wo'i-k'table' 3'is swiveled on its support and graduation lines 9 occur every ninety degrees so that whenever lines a and is are in alignment one-edge H of the work table will. be parallelwith: the: edge lz'o'f the tyne assembly table. Graduationline's'intermediate lines 9 can be pifovided' for adjusting table 3 in case one desires to mark" the work in a line not parallel tothelines of type'on table i. The typeis as-- s'embled o'n'thetable 4 in grooves runningp'arah lel to'edge' I2; Thep'antograph is pivotaiiy su ported on arm 6 by means of shait' or pivot pin I3. The pantograp-h is adjustable to various s'iz'esb'y'ineans' of the adjusting. holes Iain the arms: of the pantograph' and pins l6- which fit in holes I 5.

The traoin'gt en or stylus n isrnounted on'one end: oi'the pantographand is provided with a handle: I 8 by means of which: the tracin pen is moved along the groovedletters of the type. The marking: can be done by" any suitable scribing instrument; e; g; a diamond point, an electric needle; a viBrating-scriben a rotary engraving tooli For purposes of description thescribing instrument is herein show'nas a vibrating diainond pointedtool. The diamond point is mounte'd' up'ona rod orshart' 2! which is free to vibrate longitudinally" within casing or stem 26. The electric ibratin coil meohanisin'isinounted Within housing 2 4' which is fixedon the: collar 23. fiolla'i 23 1s axes to the upper end or stem 20'.- The vibrating marking encil, ineiuciing diamondpoint Z5; fed 2 I, stem 20, collar 23 and housing 24 and the mechanism contained thereiis hiadeas a unit which is adaptedfor easy removal or disassemoiy ironithe antograp-h l4; 'ro tnis-end the pantograph is provided with a sieevezs (Fig. 9) in which stem 2i] is free to slide and down;- compression spring" 22 acts' be diamond point in raised or non-marking position. In marking the die or tool or other article, the operator merely pushes down on the vibrator against spring 22 until the diamond point 25 engages the work and cuts the letter or number into the work. The operator need merely remove his hand from the vibrator and spring 22 will immediately raise the vibrator out'of contact with the work.

The pantograph l4 comprises parallel arms 28 and 29 each of which comprises a single metal strip or bar. The other tw parallel arms of the pantograph are double arms, the one arm comprising two metal strips or bars 30 and13| and the other two metal strips or bars 32 and 3 3. Arms 30 and 3| are positioned one above the other and arms 32 and 33 are positioned one above the other. The connection between the arms of the edge 4| of the type, however, is free to swing pantograph are designed so that the pantograph will move easily and accurately. The connection between pantograph arm 29 and arms 30 and 3| is a permanent pivotal connection, that is, sleeve 26 has a press fit in the ends of arms 30 and 3|. Arm 29 is provided with an opening in which bushing 34 has a press fit. Bushing 34 is telescoped with, and pivots about sleeve 26. Bushing 34 spaces arms 30 and 3 The pivotal connections between the arms at the other three corners of the pantograph parallelogram are shown in Fig. 4 and are designed so that the parallelogram can be manipulated easily and'substantially at the finger touch. As shown, arms 39 and 3| are connected to arm 28 by means of a pin or pintle l6, the lower end of which is threaded or screwed int arm 3 Thrust bearing races 35 are positioned between arms 36 and 28 and between arms 3| and 23. Thus, the joints between the pantographic arms are ball bearing joints. Thrust ball bearing races are also provided in the connection between the pantograph and the pantographic support arm 6. Due to these ball bearing joints the pantograph can be easily manipulated and the joints remain substantially free from play at all times--these two features are important features conducing to the accuracy of the machine. Any wear in the joints can be taken up by simply tightening the pintle |6.

The adjustment openings l5 in arms 3| and 33 are threaded for receiving the threaded ends of pins l6, as above described.

The type assembly table 4 is provided with parallel grooves 36. These groove are undercut or beveled as indicated at 37, Fig. '7. The type 38 is provided with a beveled edge or face 39 which makes an acute angle with the bottom face 40 of the type. Thus, the beveled face 39 of the type will seat accurately in the undercut or beveled edge 31 of groove 36. The opposite edge or face 4| of the type should make an obtuse angle with bottom face 4|]. Face 4| is so inclined so that the piece of type can be removed from the type groove by lifting or pivoting the piece at face 4| upwards about the corner between faces 39 and 40 as a pivot. Thus, face 4| must make an obtuse angle of a few degrees more than 90 in order to clear the face or edge of groove 36 opposite face 39 as the type is tilted out to remove the same. By way of example, an obtuse angle of 98 is satisfactory in the type shown. The obtuseness of the angle will vary depending on the dimensions of the type and groove 36. When the type 38 i seated in groove 36, the beveled edge 39 fits under the undercut or beveled edge 31 of the groove 36 to lock the type in place. The opposite upwardly or out of groove 36 because it does not interengage the opposite edge of groove 36. The type is purposely designed this way so that it can be readily removed from groove 36 by simply pulling or prying upwardly on edge 4|, preferably with a small instrument such a a pick.

If the edge 4| were beveled in the same manner as edge 39, then the type could only be removed from the type assembly plate 4 by sliding the same longitudinally out of one end of the groove 36. It was to obviate this laborious method of removing the type from the plate 4 that the bevel was omitted from edge 4|.

After the type is inserted in groove 36 and the proper legend set, the clamping blocks 45, having beveled edges 46 corresponding t the undercut 31 in grooves 36, are slid into the end of the groove 36, one on either side of the type, and pushed tight against the opposite ends of the type and then locked in place by the set screws 41. If beveled edge 39 is omitted from type 40, then when the clamps are screwed in place the type will buckle or lift out of groove 36. The provision of a single beveled edge, such as 39, which interengages the undercut or beveled edge 31 of groove 36 prevents this buckling and yet at the same time the type has the advantage of being readily lifted out of the groove 36. Thus, one can readily and. easily change any number or numbers or any letter or letters in the legend without removing either the other letters or the clamps. This could not be done if the type had to be slid out of the end of the type groove 36.

The Work table is shown in Figs. 11 to 13. The work table has fixed therein along its opposite parallel edges stationary screws 50 and 5| provided with standard acme threads 52. Each screw is provided with a nut 53 threaded thereon. The Work table is provided with a pair of clamping bars 54 and 54-A. Each end of the clamping bars 54 and 54-A is afiixed to a cylindrical block 55 provided with an opening 56 through which passes the screw 59. The ends 51 of nuts 53 are journaled in blocks 55 so that turning of nuts 53 on screw 50 adjusts clamp 54 along the work table 3. Clamp bar 54-A can be freely slid along the screws 55 and locked in any position desired by set screws 58 which are screwed in tapped openings in the blocks 56 and interengage the screws 50 in the valley of the thread. This arrangement is such that the clamping faces 60 of the clamping bars cannot get out of parallelism because the openings 56 through the blocks 55 have a close sliding fit with the outside diameter of screws 50.

In operation the type bearing whatever legend desired to be marked on the work is set up on the type assembly table 4. The work is clamped on the work table 3 and graduation lines 9 and I6 are aligned as well as lines 1 and 8 so that the marking on the work will be made parallel or in alignment with the letters on the type table 4. Tables 3 and 4 are also aligned up so that edges II and I2 are parallel. The vibrator or electric needle is next inserted in sleeve 26. Sleeve 26 and stem 26 preferably have lapped surfaces which also aids in the production of accurate markings. The vibrator or electric needle is then turned on. The operator next places the tracing pen inthe type letter and then brings the diamond point or electric needle down upon the Work. While holding the diamond point 25 against the work, the operator traces the various lettersin the type which is setup on the table 4 and these letters are reproduced by the diamond point on the work. The pantograph action causes the letters on the work to be smaller in size than the letters set up on the type table. Whenever the operator is through marking the work or any individual letter on the work he simply takes his hand off the vibrator and spring 22 automatically raises the diamond point out of contact with the work. If one desires to etch the letters or marking, then the object to be marked is first coated with paraffin and then marked through the parafiin with this machine using a hard point. The object is next subjected to the acid or other etching solution in the conventional way and the marking etched into the object along the line scribed through the parafiin.

This application is a division of my copending application Serial No. 506,357, filed October 15, 1943, now Patent No. 2,426,156, dated August 19, 1947.

Iclaim:

1. In a marking machine comprising a post, an arm swivelled on said post, and a pantograph of the parallelogram type pivotally mounted on the end of said arm, the combination of a type settin table mounted on said post below said pantograph, said type setting table having fixed guides thereon for positioning type on said table, a second arm pivoted on said post below said type setting table and adjustable upwardly and downwardly on said post, cooperating indicia on said second arm and said post for adjusting said last named arm in a predetermined position relative to said type setting table, a work support table rotatably mounted at the end of said last named arm for movement in a horizontal plane, and cooperating indicia on said work support table and said last named arm for adjusting said work support table in a predetermined position relative to said last named arm.

2. The combination as set forth in claim 1 wherein said fixed guides on said type setting table are adapted for holding type in a predetermined position on said type setting table and wherein said work support table is provided with means for aligning the straight side of a Work piece on said last named table in a predetermined position relative to the indicia on said table whereby the work piece may be arranged on said work support table with its straight side aligned in a predetermined position relative to the position of the type on said type setting table.

3. In a marking machine of the type including a pantograph of the parallelogram type and a work support table, the combination of a vertical post, an arm swivelled at one end to said post, means for pivotally supporting said pantograph on said arm adjacent its other end, a second arm swingably mounted for movement on said post in a plane below and parallel to the plane of movement of said first arm, said second arm being adjustable vertically on said post, means for rotatably mounting said work support table adjacent the end of said second arm beneath said pantograph for rotation in a horizontal plane, and means for clamping said work support table against movement on said second arm.

BERNARD W. SCHABOT.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 192,907 Ellinwood July 10, 1877 238,882 Francis Mar. 15, 1881 260,463 Earle July 4, 1882 387,595 Moore Aug. 7, 1888 695,069 Martin Mar. 11, 1902 1,055,973 Hope Oct. 17, 1911 1,471,869 Turner Oct. 23, 1923 1,508,280 Kay Sept. 9, 1924 1,626,014 Smith et al Apr. 26, 1927 2,093,203 Miller Sept. 14, 1937 2,268,654 Goddu Jan. 6, 1942 2,346,474 De la Torre Apr. 11, 1944 FOREIGN PATENTS Number Country Date 21,673 Great Britain A. D. 1899 536,685 Great Britain May 23, 1941 677,185 France Dec. 7, 1929

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