US1942873A - Work positioning means - Google Patents

Description

Jan. 9, 1934. A. H. NARROW WORK POSITIONING MEANS 4 Sheets-Sheet 1 Filed Sept. 18, 1929 array Jane 9, 1934. A. H. NARROW 3,942,873

WORK POS ITIONING MEANS Filed Sept. 18, 1929 4 Sheets-Sheet 2 220 12 7 [W252i War/ 0w Jan. 9, 1934. A NARROW 1,942,873

WORK POSITIONING MEANS Filed Sept. 18, 1929 4 S heeis-Sheet 3 a??? L /Z 1 62/5;

Jan. 9, 1934. A. H. NARROW I 1,942,873

WORK POSITIONING MEANS Filed Sept. 18, 1929 4 Sheets-Sheet 4 Patented Jan. 9, 1934 PATENT @FFHEE WQRK roslrromno MEANS Anton H. Narrow, Memphis, Tenn.

Application September 18, 1929 Serial No. 393,420

4 Claims.

My invention relates to work positioning means for machines employing tools that are provided for operation upon work that is to be shaped, the invention being of particular service in con- 5 nection with machines employing band saws that serve to trim printers slugs and rules to predetermined lengths. V

The machine of my invention contains a gauge including a work positioning member, a longitudinally movable track along which said work positioning member is movable and having holding formations distributed therealong with which a holding formation that is provided upon said Work positioning member is selectively receivable, and means for securing the track in the different positions to which it is longitudinally moved to adjust the position of the work positioning member which is preferably a bar. In the preferred embodiment of the invention the track includes two rails to which the aforesaid work positioning bar is transverse. The work is slidable along the work positioning bar to be operated upon by the saw or other tool. The rails are desirably formed into racks by the provision of gear teeth along the same and rotatable gears are in mesh with said rack teeth, these gears being provided upon the relatively rotatable and normally relatively fixed sections of a shaft. A coupling unites these shaft sections and may be loosened to permit relative longitudinal adjust ing movement of the rails, whereby the work positioning bar may be brought into exactly the right position after which the two shaft sections are again secured in fixed relation.

I also provide micrometric means whereby the work positioning bar may be moved by small increments longitudinally of the rails.

The invention includes also cam devices at the ends of another work positioning bar serving to force movement of this bar transversely of itself into work engaging position. This device enables the work to be held closely upon the table as it is being moved toward the saw or other tool, a feature of importance where the machine is designed to trim printers rules and slugs.

The invention has other characteristics and will be more fully set forth in connection with the accompanying drawings in which Fig. 1 is a plan view illustrating the preferred embodiment thereof employed in conjunction with a work engaging tool in the form of a band saw, portions of the band saw and pulley over which it passes being broken away; Fig. 2 is a sectional View on line 22 of Fig. 1; Fig. 3 is a sectional view on line 3-3 of Fig. 1, on a larger scale; Fig. 4 is a sectional view on line il of Fig. 1, on a larger scale; Fig. 5 is a, sectional view on line 55 of Fig. 1, on a larger scale; Fig. 6 is a sectional view on line 6-8 of Fig. 2, on a larger scale and with parts broken away; Fig. 7 is a sectional view on line 77 of Fig. 6; Fig. 8 is a sectional View on line 8-8 of Fig. 6; Fig. 9 is a sectional view on line 99 of Fig. 8; and Fig. 10 is a perspective view illustrating some of the parts. in the embodiment of the invention illustrated the Work table 1 is designed for use in conjunction with a band saw 2. This band saw passes over pulleys 3 and 4, one of these pulleys being 70. driven to drive the band saw and the other being an idler. The table top is interposed between the pulleys and is provided with openings 5 and 6 through which the band saw passes, the opening 6 being a slot extending along the table throughout the greater part of the length thereof. A work positioning bar 7 is arranged along and upon the table to be perpendicular to the plane of rotation of the pulleys. The work 8 which is to be operated upon by the saw or other tool 2 is guided by the work positioning bar into position to be operated upon by said tool. The work is pushed along the work positioning bar by a pusher 9 which has a reduced portion 16 which passes through and is in sliding engagement with the longitudinal margins of the slot 6, the work positioning bar '7 and slot 6 being in parallelism. The machine of my invention, having been primarily designed for trimming printers rules and linotype slugs, I provide means for holding the work down upon the table top closely adjacent the place of engagement of the saw with the work. This holding means includes a Work positioning bar 12 which margins the inner longitudinal side of the slot 6 and which is spaced sufficiently far from the top of the table as to permit the work to snugly pass thereunder and across the slot 6 into position to be operated upon by the band saw. The downward adjustment of the bar 12 permits the work to have snug sliding engagement therewith as the pusher 9 is moved along the slot 6. The means for positioning the bar 12 is desirably such as to afford two alternative spacings between the bar and the work table to suit the varying widths of the slugs or rules that are to be trimmed. To this end, I have provided two brackets 13 and 14 to which are respectively bolted the upright plates 15 and 16. These plates are provided with upright slots 1''! through which the clamping screws 18 are passed, the slots being just suificiently lon so that when their upper ends engage the bolts, the bar 12 will be given one adjustment and when their lower ends en gage the bolts, the bar will be given the alternative adjustment. In this way the bar will maintain snug guiding fit with the work of two different heights. In adjusting the from one alternative position to the other, the camming devices 19 are turned. These caznming devices are received within notches formed in the upper ends of the plates 15 and 15, the top margin 21 of one notch in each plate being higher than the top margin 22 oi the other notch. Each camming device 19 is of U form, one side being engageable within one of the aforesaid notches and the other within the other notch. The camming devices are rotatably mounted at the base of bight portions thereof and are extended into thumb holds, whereby they may readily be turned.

The work positioning bar '7 is adjustable toward and from the slot 5. To this end, it is desirably movable along a track that is disposed perpendicularly or transversely to the slot 6 and the bar 7. This track desirably includes two rails 24 and The work positioning bar 7 is provided with holding formations 26 which are engageable with holding formations 27 upon'rails 24 and 25. These holding formations are preferably in the nature of teeth, the teeth 27 forming the rails 24, 25 into racks, while the teeth 26 are provided upon blocks 28 which are vertically reciprocable within the upright slots 29 which are formed in the blocks 30. The positioning bar 7 is secured to these blocks 30, this bar and these blocks being thus together movable transversely of the slot 6 when the blocks 28 are lowered out of engagement with the track rails 24, 25. The blocks 30 carry upwardly spring pressed plungers 31, which are rigidly connected to the blocks 28,

as is best shown in Fig. 3, the springs 32 pressing upon these plungers, serving to place the blocks 28 in their normal uppermost positions in which the teeth 26 upon these blocks are in mesh with the teeth 27 upon said track rails. The plungers are simultaneously depressed, when the bar 7 is to be shifted, for the purpose of disengaging both blocks 28 from the rails 24, 25. The device for simultaneously depressing the plungers includes a bar 33 extending along the work positioning bar and which is journaled, at its ends, in the brackets 34 that are carried upon the ends of the blocks 30. The bar 33 is provided with a handle 35, at its mid-portion, so that this bar may be turned upon its axis to have depressing engagement with the plungers that are disposed beneath the same. When the blocks 28 are withdrawn from engagement with the track rails, the work positioning bar 7 may be moved crosswise of the table to the desired extent which may be determined with the aid of a pointer 36 which is carried by one 01. the brackets 34 and travels over the scale divisions of the scale bar 37. In the adjusting movements of the work positioning bar 7 the pinions 38, which are journaled in the blocks 39 and which are in permanent mesh with the teeth of the rails 24, 25 are idly turned. The pinions 38 thus facilitate movement by small increments of the blocks 30 with respect to the rails 24, 25. These pinions are provided upon a shaft which is formed in two sections 39 and 40. These two shaft sections are coupled by a sleeve 41 which is permanently secured to one of the sections and is separably clamped into engagement with the other by means of the clamping screws 42 and 43. If the work positioning bar 7 has not been moved in exact parallelism with the slot 6 and the plane of sawing of the band saw, said screws are loosened and one or the other of the shaft sections is turned to bring said work positioning bar into such parallelism, whereaiter said screws are again tightened.

In addition to having the work positioning bar '7 adjusted along the track rails 25 said track rails are themselves bodily adjustable lengthwise. These track rails may be received in slots formed in the top side of the work positioner 12 and may be slidingly held in such slots by the cover plates 44, that are screwed down upon the bar 12. When these tracks are moved lengthwise they carry with them the work positioning bar 7. In order that said track rails may thus be moved, I employ two normally fixedly coupled coaxial driving pinions 45 which are in mesh with the teeth 2'7 of the rails, whereby said rails are moved together. These pinions are provided upon the two sections 46 and 4'7 of a driving shaft, these shaft sections being normally held in fixed relation by means of a sleeve 48 which is a fixed continuation of the shaft section 46, and the screws 49 which rigidly secure this sleeve into assembly with the shaft section 47. The pinions 45 are journaled within blocks 50 which, unlike the blocks 30, are rigidly secured to the table 1. The track rails are held down in engagement with the p-inions 45 by means of plates 51 which are screwed down upon these blocks against the top sides of the rails that are slidingly received within slots formed in the blocks 50. Any suitable means may be employed for turning the shaft to effect the simultaneous movement of the rails crosswise of the table. The means shown includes an arm 52 which is rigidly secured to the shaft section 47. In order that the range of movement of the shaft 46, 4'7 may be accurately defined and predetermined, I desirably provide the arm 52 with a spring pressed plunger 53 which is in changeable engagement with the teeth 54 of a stationarily mounted sector 55. The teeth 54 are radially directed. Where the machine is adapted for the trimming of rules or slugs for printers use, said teeth are desirably so spaced apart that each tooth space corresponds to one-twelfth of a pica. That is when the arm 52 is turned to bring the plunger 53 out of engagement with g one tooth 54 into engagement with an adjacent tooth the track rails 24 and 25 are moved onetwelfth of a pica toward the slot 6 or away from said slot according to the direction in which said arm is turned. If the shaft sections 46 and 3 4'7 happen to be so related that the work positioning bar 7 is not in exact parallelism with the slot 6, the screws 49 may be loosened to permit relative longitudinal adjustment of the track rails until said work positioning bar is in exact parallelism with said slot, whereafter the screws 49 may be tightened.

Changes may be made without departing from the invention.

Having thus described my invention, I claim: 140

1. Work positioning means including parallel racks; a block carried by and movable on each rack; means connecting the blocks adjustably for relative movement thereof; a toothed member carried by and movable in each blockya spring carried by each block and pressing the toothed members into engagement with the racks to fix the position of the blocks on the racks; a plunger carried by each block and connected with the toothed member to move the same away 150 from the rack; a work positioning member carried by the blocks transversely of the racks; a bar hinged to both blocks and engageable with the plungers to simultaneously release the blocks against the force of the spr ngs to adjust the work positioning member; and a handle on the bar for manipulation thereof.

2. Work positioning means including parallel racks; a block carried by and movable on each rack; a toothed member carried by and movable in each block; a spring carried by each block and pressing the toothed members into engagement with the racks to fix the position of the blocks thereon; a pinion carried by and rotatable in each block in engagement with each rack; a shaft section connected to each pinion, said sections being axially alignable; a sleeve fixed to one of the sections and adjustably receiving the other section; clamping screws for clamping the sleeve and shaft section received therein together; a work positioning bar carriedby the blocks transversely of the racks; and unitary means for simultaneously moving both toothed members away from the racks to adjust the bar, said pinions having continuous engagement with the racks during said adjustment and being independently movable to permit minute adjustments of the bar by small increments.

3. The structure of claim 2 wherein the racks are themselves bodily adjustable lengthwise.

4. The structure of claim 2 wherein mechanism is provided for adjusting the racks lengthwise said meohanism including coaxially coupled driving pinions engaging the racks; a lever arm connected with said driving pinions to rotate the same; a sector plate fixed with respect to the lever arm, radially directed teeth on said sector; and a spring pressed plunger carried by the lever arm and engageable in the teeth of the sector.

ANTON H. NARROW.

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