US2676534A - Rotary marxing tool and mounting means therefor - Google Patents

Description

April 27, 1 5 R. H. NORRIS ETAL 2,676,534

ROTARY MARKING TOOL AND MOUNTING MEANS THEREFOR Filed March 27, 1951 2 Sheets-Sheet l INVENTORS, FZCidrJ/fNdf/Zli Ap 1954 R. H. NORRIS ETAL 2,676,534

ROTARY MARKING TOOL AND MOUNTING MEANS THEREFOR Filed March 27,1951 2 Sheets-Sheet 2 I VENTO Fzd%ara arriz,

' rollv Patented Apr. 27, 1954 ROTARY MARKING TOOL AND MOUNTING MEANS THEREFOR Richard H. Norris and Harvey E. Woodard, De-

troit, Mich., assignors to New Method Steel Stamps, 1110., Detroit, Mich., a corporation of Michigan Application March 27, 1951, Serial No. 217,763

This invention relates to new anduseful improvements in tools for marking graduations or other indicia on external surfaces of screw machine parts and the like.

The subject matter of this application represents an improvement in marking tool disclosed in the copending application of Richard H. Norris, Serial No. 123,85 l, which was filed October 27, 1949, and matured into Patent No. 2,610,576 on the 16th day of September, 1952. The tool shown in this prior application is pre-eminently satisfactory in operation but some difilculty has been experienced in adapting it to widely variant conditions of use. Marking tools conventionally are not included as parts of machine tools.

Rather, they comprise accessories to these tools and are added when and where the situation re- .quires it. Manifestly, the environments where on all of these machines and there is no onemounting bracket that is universal in its application. Accordingly, it is expedient for the marking tool manufacturer to make and sell the working parts of the tool as a subassembly and to let the ultimate purchaser construct a mounting bracket that will adapt the tool for the particular machine on which it is to be used.

In addition to the above, it is necessary to change the marking roll from time to time and the instant method of assembling the operating parts of the tool permits the roll to be changed with maximum speed and facility and without disassembling a large number of small parts that are easily scattered and lost or misplaced.

An important object of the present invention is to provide, a marking tool that can be easily and quickly disassembledto change the marking Another object of the invention is to provide a marking tool in which substantially all the parts removed from the holder during substitution of the roll are held together as a subassembly.

Still another object of the invention is to provide a marking tool in which the operating parts I of the tool can be adapted to a variety of holders this specifi 4 Claims. (01. 101-28)- 2 cation and whereinlike numerals are employed to designate like parts throughout the same;

Fig. 1 is a perspective view of a marking tool embodying the invention;

Fig. 2 is a vertical, transverse, sectional view taken on the line 2-2 of Fig. 1;

Fig. 3 is a vertical, longitudinal, sectional view taken on the line 3-3 of Fig. 2;

Fig. 4 is an exploded, perspective view of the tool looking from one side of the tool showing the parts disassembled as when a marking roll is being substituted; and

Fig. 5 is an exploded, perspective view of the tool looking from the other side thereof.

The marking tool here shown comprises a mounting bracketor holder l0 having bifurcations l2 and M at one end thereof disposed in embracing relation to and rotatably supporting a marking roll t6. The mounting bracket of course can assume a variety of forms, but the one here shown-has a longitudinal shank is which extends from and is in alignment with the bifurcation l2. Two threaded openings 20 and 22 are provided in the shank [8 for use in attaching the tool to a machine.

The marking roll I6 is mounted on a hub 24 having oppositely disposed axial spindles 2G and 28 which extend'through aligned openings 30 and 32' in the bifurcations l2 and I4 respectively. A bearing 34 in opening 30 rotatably supports spindle 26, and a bearing 36 on the spindle 28 rotatably supports the spindle in the opening 32. For reasons hereinafter apparent, bearing 3 is press fitted into opening 36 and has a slip fit on spindle 26. Bearing 36, on the other hand, is press fitted on the spindle 2a and has a slip fit in opening 32. As perhaps best shown in Fig. 2, the hub 24 carries a key 38 which extends intoa keyw-ay 40 in the marking roll [6. The key 38 connects the marking roll 16 and hub 24 for mutual rotation but permits the hub to be pulled axially out of the marking roll;

Spindle 28 is longer than spindle 2'6 and extends -a substantial distance beyond the bearing 36. Mounted on the projecting portion of spindle 28 is a knob 42 having a pair of laterally spaced, radially projecting, annular flanges 44 and it. The knob 42 is press fitted on or otherwise fixed to the spindle 28 so as to rotate with the marking roll l6. As clearly shown in the drawings, the knob 42 is spaced laterally from bifurcation l4 and a mounting plate 58 is interposed therebetween. Th mounting plate 48 fits snugly between the bifurcation Miand knob 42 and it is partially located on and attached to theblfurcationi l by 3 studs 50 and 52 which extend from the bifurcation and through openings 54 and 56 in the plate. The studs 50 and 52 preferably are located adjacent the distal end of bifurcation I4 so to locate and support the front end of the mounting plate 48.

An adjustable stop screw 58 carried by a block 60 engages a pin 6I carried by and extending between the flanges 44 and 46 to position the marking roll I6 rotatably for proper initial engagement with work to be marked. The screw 58 preferably is provided with a flat, longitudinal head 62 for convenience in adjusting the screw, and a lock nut 63 is provided on thescrew'to hold it in the selected adjusted position. The block 60 is fastened to mounting plate 48 by a rivet 64. Screws 66 and 68 extend through openings I and I2 in the block 60 and mounting plate 48 and into threaded holes I4 and 16 in the holder I0 to hold the mounting plate and its adjuncts detachably fastened to the holder.

A helical spring 18 is disposed on spindle 28 and received in a central recess .30 in knob 42. The outer end 82 of spring I8 extends into an opening 04 in knob 42. The inner terminal portion of spring I8 extends radially from spindle 28 in a countersink 66 provided at the inner side of knob 42, and the inner end 88 of the spring extends into a hole 90 provided in mounting plate 48. If necessary or desirable a recess 92 may be provided in bifurcation I4 in alignment with the opening 90 to accommodate any of the end 88 that may extend beyond the mounting plate 48.

In use the marking roll I6 is jammed against The marking roll I6 here shown is formed with a peripheral indentation or recess 06 which extends the full width of the roll and is disposed substantially immediately behind the marking indicia 94. Inertia causes the marking roll l6 to continue to rotate through several degrees against the action of spring I0 after the marking operation has been completed and suniciently to bring the recess 96 into confronting relation with the work 93. In the latter position, the marking roll I6 is entirely disengaged from the work so that there is no marking or scoring of the work by dragging of the indicia 94 or other parts of the marking roll across the workbefore the marking tool is retracted.

After the marking it is almost impossible to retract the marking tool .sufficientlyquickly to avoid marring of the work if the marking roll is permitted to rotate immediately and automatically under the action of spring I8 to its initial position. Accordingly provision is made for holding the marking roll positioned with the recess '96 in confronting relation to the work until the marking tool has been retracted sufficiently to prevent contact of the marking indicia with the work.

In the form of the invention shown, the holding means is in the form of a pawl 88 which operates in a recess I00 provided at the lower end of block 60. The pawl 98 is attached to the block 60 by a pivot I412. As perhaps best shown in Fig. 3, the pawl 98 engages serrations I04 in the periphery of the knob flange 44. A spring I06 fastened at one end to the block 60 and at the other end to the pawl 98 below pivot I02 holds the pawl normally engaged with the flange 44. In operation, the pawl 88 ratchets freely during the marking operation, but by reason of its spring-pressed engagement with the serrations I04, it prevents return rotation of the marking roll until the pawl is pivoted out of engagement with the knob 42. The marking tool conventionally is mounted on a slide or other suitable means for advancing and retracting the same relative to the work, and a stop I08 is provided on the machine to engage the lower end of pawl 80 near the end of the retractive movement. This construction is perhaps best illustrated in Fig. '3. It will be observed that engagement of the pawl 98 with the stop I08 prior to the time the marking tool reaches the limit of its travel away from the work causes the pawl to pivot so as to release the serrations I04 and permits spring I8 to return the marking roll I6 to its initial position with pin 61 against the adjustable stop 58.

By reason of the above construction the marking roll I6 can be changed easily and quickly by removing screws 66 and 68 and by pulling the mounting plate 48 and its adjuncts away from the holder I0. This causes the outer spindle 26 to pull out of the bearing 34 which remains in the opening as a part of theholder I0. It also causes the hub '24 to pull out of the marking roll I6 and the bearing 36 to leave the opening 32 in which it is mounted. When the hub 24 and spindle 26 are completely disengaged from the holder I0, the marking roll I6 falls away from the holder and is readily removed. The holder 10 of course remains attached to the machine. It will be observed that the operating parts of the tool remain assembled on the mounting plate 48 and that except for the two screws '66 and 64 there are no loose parts that may become lost or misplaced.

Another marking roll can be easily substituted for the one removed by reversing the above operations. The new roll is inserted between the bifurcations I2 and I4 and the subassembly is mounted again on the holder I0. It will be observed in this connection that the studs and 52 enter openings 54 and 56 to hold the mounting plate 48 initially assembled and properly positioned on the holder I 0 until the fastening screws 66 and 68 can be inserted and tightened to faci1itate assembly of the parts.

A further feature of the invention is that the hub 24 and plate 48 form substantially a complete seal for the bearing 36 and effectively prevent dirt, grit, and the like from gaining access to the bearing.

It may thus be seen that the structure shown achieves the objects of the invention. The operating parts of thetool are uniquely assembled and correlated to facilitate and expedite changing of the marking roll 56 and the arrangement is such that all the operating parts of the tool are maintained as a subassembly when the tool is disassembled for replacement of the roll. In addition, the several parts of the subassembly are constructed to provide a complete seal for the bearing 36 which forms a part of the subassembly. Also, by reason of the construction hereinafter described, the manufacturer can, if desired, manufacture and sell only the winssembly of operating parts so that the purchaser can adapt these parts to his particular machine by mounting it in a holder of his own design and manufacture.

Having thus described the invention, we claim:

1. A marking tool comprising a mounting bracket having a bifurcated end, a mounting plate detachably fastened to one of said bifurcations at the outer side thereof, a marking roll disposed between said bifurcations, a hub disposed between and having axial, opposite spindle portions extending through said bifurcations, a marking roll mounted on said hub for rotation therewith, a bearing fixed to the bifurcation remote from the mounting plate rotatable supporting and disengageable'from the spindle portion extending therethrough, a bearing in and disengageable from the bifurcation adjacent the mounting plate fixed on and rotatably supporting the other of said spindle portions, a springbiased knob fixed on sail last-mentioned spindle portion at the outer side of the mounting plate, spring means coactive with said knob normally tending to rotate the same and said marking roll in one direction, and means co-operative with said knob for holding the marking roll normally in a predetermined rotative position.

2. A marking tool comprising a bifurcated mounting bracket, aligned bearings carried by said bifurcations, one bearing being fixed and the other bearing being removable, a hub disposed between said bifurcations and having opposite spindle portions extending through and rotatably supported by said bearings, a marking roll on and rotatable with said hub, a mounting plate detachably fastened to the bifurcation carrying 1 said removable bearing and co-operating with said hub to hold said removable bearing assembled on the spindle portion which it rotatably supports, stop means for initially rotatably positioning said marking roll, and spring means coactive with the roll for holding the same normally in said initial position.

3. In a marking tool, the subcombination comprising a mounting plate adapted to be detachably fastened to a suitable support, a hub adapted to carry a marking roll having a spindle portion extending through and projecting from said plate,'a bearing on said spindle portion interposed between and retained by the hub and said plate, a knob fixed on the projecting portion of said spindle, a block on the mounting plate lateral- 1y of and adjacent said knob, and adjustable stop carried by said block, means on said knob engageable with said stop to rotatably position said hub, and spring means around said spindle having one end attached to the knob and the other end attached to said mounting plate normally holding said positioning means against said adjustable stop, and a spring-biased pawl pivoted on the block and coactive with said knob to prevent rotation of the knob in one direction.

4. In a marking tool, the subcombination comprising a mounting plate adapted for attachment to a suitable support, a hub adapted to carry a marking roll and having spindle portion of lesser diameter than the hub at opposite sides thereof, one of said spindle portions adapted to receive a bearing and the other spindle portion extending through said mounting plate, a bearing on said other spindle portion confined between the hub and said mounting plate, and means on the spindle preventing axial movement of said other spindle portion relative to the mounting plate and holding the bearing confined between the hub and the mounting plate.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,095,337 Lommatzsch May 5, 1914 1,186,712 Vandergrift June 13, 1916 1,500,771 Schlueter July 8, 1924 1,840,680 Schubach Jan. 12, 1932 1,886,564 Lunden Nov. 8, 1932 1,978,330 Scholtes Oct. 23, 1934 2,408,899 Wright Oct. 8, 1946 2,417,865 Douglass Mar. 25, 1947

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