US2040437A - Printing plate shaving machine - Google Patents

Description

May 12, 1936. w. F. HUCK' PRINTI NG PLATE SHAVING MACHINE Filed NOV. 25, 1953 5 Sheets-Sheet 1 INVENTOR.

A'r'ry F'IG.E3.- -FIG.m.-

May 12, 1936. w, HUCK 2,040,437

PRINTING PLATE SHAVING MACHINE Filed Nov. 25 1935 5 Sheets-Sheet 2 i; n a a x '2 v 5% i 3$ INVENTOR.

May 12, 1936. w F HUCK 2,040,437

' PRINTING PLATE SHAVING MACHINE Filed NOV. 25, 1935 5 Sheets-Sheet I w I INVENTOR; 244

May 12, 1936. HUCK 2,040,437

' PRINTING PLATE SHAVING MACHINE V Filed Nov. 25, 1955 '5 Sheets-Sheet 4 -|-|c;. u.- 66K INVENTOR.

11 69 I ALJ May 12, 1936. I w. F. HUCK 2,040,437

' PRINTING PLATE SHAVING MACHINE I Fi led Nov. 25, 1953 5 sheets-sheet 5 INVENTOR.

Patented May 12, 1936 UNITED STATES PATENT OFFICE PRINTING PLATE SHAVING MACHINE Application November 25, 1933, Serial No. 699,732

14 Claims.

This invention in general relates to printing plate shaving machines having for its general object an improved and more efficient device of the kind indicated.

A more particular object is to provide a printing plate shaving machine of a highly efficient design and balanced construction, embodying improved means for progressively advancing and holding down printing plates while being shaved, for making the cutting instrumentalities operative, preventing lost motion in the operating means, and other improved means for securing a direct micrometer gauge reading of the thickness of the shaving removed at each cutting operation and/ or the total amount by which a printing plate is reduced in thickness.

Another object is to provide a device of the kind indicated with improved electrically actuated means for automatically stopping the reciprocating instrumentalities at the completion of each reciprocation.

A further object is to provide improved manual- 1y operable means for smoothly raising and lowering the plate supporting means in order to graduate the depth of cut required, while simultaneously indicating on a gauge the extent of the vertical movement of the said plate supporting means.

Another object is to provide automatic means for moving the shaving knife to operative position during each positive reciprocation of the table.

It is also an object of the invention to provide a plate shaving machine of generally improved construction, whereby the device will be simple, durable and inexpensive in construction, as well as convenient, practical, serviceable and efficient in its use.

With the foregoing and other objects in View, which will appear as the description proceeds, the invention resides in the combination and arrangement of parts, and in the details of construction hereinafter described and claimed.

The preferred embodiment of the invention is illustrated in the accompanying drawings, wherein:

Figure 1 is a side elevational view of an embodiment of the invention;

Figure 2 is a fragmentary enlarged elevational view, partly in section, with parts broken away, of certain parts shown in Figure 1;

Figure 3 is a top plan view of the device, as seen in the direction of the arrow 3 of Figure 1;

Figure 4 is an enlarged fragmentary sectional view, partly in elevation, taken on the line and as viewed in the direction of the arrow 4 of Figure 1;

Figure 5 is an enlarged fragmentary sectional view, taken on the line and as viewed in the direction of the arrow 5 of Figure 1;

Figure 6 is an enlarged fragmentary elevational view of a sectional plate engaging roller;

Figure '7 is an enlarged fragmentary sectional view, taken on the line and as viewed in the direction of the arrow 1 of Figure 6;

Figure 8 is an enlarged fragmentary elevational' view of the multiple roller assembly which coacts with the plate engaging rolls shown in Figure 6 in pressing down a plate while being shaved;

Figure 9 is a fragmentary sectional view, partly in eleveation, taken on the line and as viewed in the direction of the arrow 9 of Figure 8;

Figure 10 is an elevational view of certain parts as viewed in the direction of the arrow III of Figure 2;

Figure 11 is an enlarged fragmentary sectional detail view of the plate stop and certain adjacent elements;

Figure 12 is an enlarged fragmentary sectional view of details as seen in the direction of the arrow I2 of Figure 5;

Figure 13 is an end elevational view as seen in the direction of the arrow I3 of Figure 12; and

Figure 14 is a fragmentary sectional view, taken on line FI4 of Figure 5, as seen in the direction of the arrow.

In the drawings, II designates generally the frame of the device which includes side members or pedestals I2 and I3 formed with inwardly directed flanges or projections I4, I5 serving as trackways or supporting ledges whereon are seated shoulders I6, I1 of uprights or members I8, I9 forming a part of a reciprocating carriage or table 23 adapted to support a printing plate 2| while being shaved. The said members I8, I9 are joined by a base plate 22 to which they are secured in any suitable manner as by the screws 23.

The reciprocating table 20 also includes an internal bed or plate supporting member 24 provided with outwardly projecting flanges 25,. 26 which are slidably confined between vertically extending portions or guides 21, 28 of the said frame members. The plate supporting member 24 of the table 20 has also integrally formed therewith a depending lug or threaded socket member 29 apertured to receive a single screw shaft or spindle 30 arranged in the side members I2, I3 and connected by gearing, indicated generally at 3!, to a motor M. The screw shaft 30, which, as hereinafter described, serves to reciprocate the table 20, is provided with an elongated pocket or recess 36', adapted to receive a guide rod 24' which in turn is fastened to the. bed plate 24. The bed plate 24 has integrally formed therewith depending sides 32, 33 provided with inclined edges 32, 33 which latter register with and are supported on correspondingly inclined upper surfaces or planes 34, 35 of side frames 34, 35 (Figure 1), forming a part of the lower portion of plate 22. TIhe coacting inclined plane surfaces 32', 33, 34, and 35f provide. an efficient means of smoothly raising and lowering the bed plate 24 by stepiess gradations when the saidframes 34, 35 are reciprocated in a horizontal plane by manually operable means hereinafter described.

The cross member 36 carries a threaded nut or block 38 suitably secured thereto and adapted to accommodate the threaded end of a manually operated adjusting rod or screw spindle 3B having an outer portion journaled on bearing means indicated generally at 38a, the said bearing means being suitably secured to an end wall joining and forming'a part of the members I8, |9. A coil spring 39 encircling the spindle 38 and confined between the block 38 and a plate 39' (Figure '3) and suitably held-in position relatively to the block 38, serves to prevent play or lost motion between the said spindle and block 38. As best shown in Figure 1, 'a thrust collar 39a is pinned to the spindle 38' and engaged against the bearing means 38a; 7

.It will now be understood that when the adjusting spindle 38 is turned by a hand wheel W secured toan outer end thereof, the cross member 36 and parts connected thereto-including the side frames 34, will be moved in a plane parallel to the longitudinal axis of the frame I I, thereby causing the inclined edges of'the said. side frames 34, 35 to slide under the registering inclined plane edges of the upper side'frames 32, 33 and consequently,'elevating or lowering the bed plate 24 to the extent desired in order to position the latter to shave or cut a predetermined amount of metal from the plate. 2| when the table 20 is reciprocated in a direction from left to right, as seen in Figure 1.

Arranged between upper and diagonally stretching portions or extensions of the frame members |2, |3, a plate hold-down assembly indicated generally at 40 is hingedly mounted or journaled at one end on a rod or shaft 40 secured in said extensions, and is adjustably and pivotally connected at another end as at 4| to turnbuckles or equivalent elements 42, 43, each of which is hingedly connected to an adjacent yoke or bracket 44, respectively (Figure. 4) which are keyed to a shaft 46 rotatably supported in the diagonally stretching frame members or extensions 41, 48, referred to above, the said shaft 46 having operating handles 49, 49'. As best shown in Figure 10, a portion of the hub of the handle 49 receives athreaded pin 4611 upon which is journaled the head 46b of a rod 46 against the said head of which the upper end of a spring 48' encircling the said rod is engaged, the lower end of the said spring being seated on a bracket 41 hingedly mounted on a stud 41a secured to the frame member 41, the hinging of the said bracket 41' permitting angular movement of the rod 46. The spring 48' balances the weight of the assembly 49 and also normally maintains a follow-up pressure or bias serving to maintain the said assembly either in lowered operative position, as shown in full lines in Figure 2, or in raised inoperative position, as shown in dotted lines in Figure 1, these results being accomplished by the offset position of the head or block 46b of the spring rod 46' relatively to the shaft 46, in both raised and lowered positions of the said assembly. As best shown-in Figures 1 and 2, a stop 45' is secured to the frame member 41, the said. stop being engaged by an adjacent yoke 44, and serving to restrain the assembly from substantial further downward or angular movement beyond the position shown in Figures 1 and 2.

The turnbuckles 42, 43, mentioned above, provide means for finely adjusting the assembly 40,

the rollers 50 of which latter are adapted to press directly against the upper surface of the printing plate 2|, so that the series of said rollers 59 may be correctly aligned with the said plate. The hinged connections 40 of the plate hold-down assembly permits same to be swung upwardly for inspection or adjustment when desired and then to be returned instantly to operative position.

The plate hold-down assembly 40 includes a plurality of rollers 50, the shaft ends of which are connected to rods or stems 50 slidably arranged in pockets 5| having bushings 5|a' in which springs 5| encircling the said stems, are accommodated (see Figures 8-9). The springs 5| are confined betweenan upper portion of the hold-down assembly and the adjacent portions of the shaft end of each roller 59 alluded to above, the said springs 5| serving to maintain a follow up pressure of the rollers 50 upon the printing plate 2|.

The means for holding down the plate 2| also includes a pressure member indicated generallyat 52 (Figures 6 and '1) which is hinged to the'side frame members 41, 48 and composed of individual sections or rolls 52', each rotatably mounted between an adjacent pair of arms 53 forming apart of each of a plurality of spring pressed plungers or U-shaped yokes 53 to which the rolls 52 are secured. .Each yoke 53 is positioned between a pair of plates '54 arranged in spaced relation in any suitable manner by means which may include lower and upper spacer blocks 54 54 securedby screws 54' and 52 Each of the yoke arms- 53 in' turn spans an adjacent element or section of the lower spacer block 54 which latter is of the sectional type, the individual sections being secured between the side plates 54 by the screws 52 mentioned above, while the upper spacer block 54 is preferably of unitary construction. Each of the yoke members 53 is furtherprovided with astop pin 53 which normally rests upon the top of the lower spacer block 54 (Figure 7) the said stop pin limiting the downward movement of an adjacent yoke or plunger 53. V

In order to vertically'adjust 'the pressure member 52, the plates 54 are formed with slots 55 which accommodate screws 55. Adjusting screws 7 56 threadedly engaged in lugs or projections 56 formed integrally with'the spacer block 54 and engaged against the upper edge of one of the pair of joined plates 54, provide means for the vertiframes 41, 48 and having lugs 60 which serve as stops to limit the upward movement of the member 51', it being understood that when the solenoid is energized and 'deenergized through switch means hereinafter described, the member:

51' may be angled about its pivotal connection to the side frames 41, 48, thus permittingthe knife 51 attached thereto to be swung or lowered to engage the plate 2|, or raised out of effective operating position therewith.

In order to energize, deenergize and reverse the motor M which reciprocates the table 28, and also in order to actuate the solenoid S which moves the knife 5? into and out of operative or cutting range of the plate 2| on the bed plate 24, a suitable switching mechanism (not shown) which may be of conventional type having the customary forward, stop and reverse push buttons, is attached to the device at any convenient portion thereof. A pair of limit switches 6|, 62 fastened in any suitable manner to the stationary pedestals I2, I3 and electrically connected to the circuit controlled by the above-mentioned switching mechanism is also provided. As best shown in Figure l, the limit switch 6i has already engaged a depending lug or projection 6| on the base plate 22 (Figure 4) of the reciprocating table 2!! as the latter was moving in a direction from left to right (as seen in Figure 1). In a similar manner, the limit switch 62 is adapted to engage a. lug 62 also secured to the base plate 22, when the reciprocating table moves from right to left.

As indicated in Figures 1 and 11, a plate engaging member or stop indicated generally at 63 is provided, the saidstop being adapted to yield in a vertical plane and move with the printing plate 2| as the cutting knife 51 moves over and shaves that portion of the said printing plate which is adjacent to the stop. The said stop, as best shown in Figure 11, comprises a bar 64 which is secured by screws 65 in an elongated recess 66 provided in the upper surface of an end portion of the reciprocating bed plate 24. An upper portion of the bar 64 is recessed to accommodate a series of plates- 61 adapted to directly engage an adjacent end of the printing plate 2|, the plates 67 being seated on a strip of resilient material 68 arranged in a groove formed in the bar 64. Screws 69 retain the plates 61 and resilient strip 68 in position on the bar 64, the said screws 69 being locked against loosening by set screws H. The purpose of the resilient material 68 is to permit the plate engaging end of the stop 63, while under the pressure incident to the shaving operation, to move downward so as to allow the end of the plate 2| which abuts the stop to contact firmly with the rigid bed or plate supporting member 24. The other end of the printing plate 2| abuts against an adjustable stop 12 (Figure 2), arranged on the upper surface of the bed plate 24 of the reciprocating table 20, the printing plate 2|, in this manner, being located in pro-per position on the said reciprocating table 20 and pressed down by the assembly 46 and pressure member 52 while the said table is oscillated.

It is to be understood that in practice the pressure of the plate hold-down assembly 4|] and the roller 52' coupled to that of the knife 51 has a tendency to slightly depress the forward and rearward end of the printing plate on the bed 24. Prior to applicants invention, however, the rearward, or left hand end of the printing plate (as seen in Figure l) was prevented from moving in a. vertical plane as the cutting knife and press down assembly passed over same, this being the type of stop hitherto employed, which, being of a rigid and unyielding type, engaged the rearward end of the printing plate firmly and prevented same from moving downwardly. As a result of this inequality of movement, the printing plate was shaved to a greater extent at the rearward end than at the front end. This operating defect, so fatal to the production of a printing plate of uniform thickness, has been completely overcome by the present means which is particularly designed and adapted to permit both ends of the printing plate to move slightly downward with a consequent uniform thinning of the plate.

In order to determine with accuracy, the distance between the cutting knife 51 and the plate supporting member 24, or the vertical displacement of the upper portion of the reciprocating table 20 relatively to the said knife, and consequently, the amount of metal shaved from the plate being operated upon, a calibrated meter or indicating means I3 preferably a commercial dial type instrument is provided, this meter being actuated by a spring biased bell crank lever 14 which is rockably mounted on a stud 15 journaled in the end portion of the frames l8, l9 (see Figure 14).

As best shown in Figure 5, the bell crank lever 14 at its upper end bears against a link or rod 13 connected to the internal mechanism (not shown) of the meter 13, the said bell crank 14 being provided at the end of its lower arm with a small plate 16 which'is adapted to'be engaged by a finger or pin 11 slidably and clampingly secured in a circular portion of a slot I8 formed in an adjustable block or plate 18, by means of a screw 19 threaded in the plate 18 and passing transversely through the slot 78. The outer split portion of the block 18 formed by the said slot,

thus firmly clamps the finger 11in normal operative position or frees same for adjustment, when desired. The block 18 is arranged between a pair of projections 82 formed on the end of the rod 8|, the said block 18 being provided with a slot 19 formed in same, the latter receiving the stem of a screw 80 threaded to the end of the rod 8| (Figures 5, 12, and 13). As best shown in Figure 4, the rod 8| is secured to an extension 83 of the socket 29 which as mentioned above, is formed integrally with the plate supporting member 24. A second screw 84 rotatable in an extension 18a of the block 18 and threadedly engaged into the rod 8|, serves to bodily shift or move the block 18 and, consequently, the finger H to the extent desired within the limits of the slot 19, relatively to the rod BI and the upper surface of the plate I6, in this manner increasing or decreasing the effective operating length of the lower arm of the bell crank lever 14, as best shown in Figure 5. It is, of course, to be understood that before the block 18 is adjusted by the screw 84, the screw 88 will first be loosened, and after the desired adjustments are made, this said screw 88 will be tightened, to maintain the block in fixed position.

It will be further understood the finger 11 may be vertically adjusted to compensate for wear, to allow for replacement and for such slight changes in the relative position of the lever 14 and the finger 11, as may be required. From the above, it will be observed that the meter 13 can be regulated or calibrated to a very fine degree of adjustment. It will also be understood that for all normal operating conditions, the finger 11 will be engaged with the plate 16 at substantially the position shown in Figure 5, in which position vertical displacement of the reciprocating plate supporting member 24 resulting from horizontal movement of the lower inclined plane surfaces 34 and 35 relatively to the coacting surfaces 32, 33' will cause a correspondingly equal and substantially horizontal displacement or thrust of the rod 13 mentioned above which is connected toithe mechanism forming a part of the calibrated meter 13, thereby moving'the indicating means 85 and 86 over their respective scales 85 and 86. When adjustments are necessary, as remarked above, as through natural wear or otherwise, the plate or block 18 may be finely adjustedby the screw 84 tomeet different conditions encountered and for compensating for wear and the likein the elements wheel W towards the stationary cutting knife connected thereto. 7 V 7 The'general function and "manner of operation of the device has been in large measure indicated above, but may be summarized as follows:

Assuming a printing plate 2| of a given thickness which, for example, may be .933 has been placed upon the reciprocatingbed 24 between the stops 83, i2, and the plate hold-down means 40, including the pressure roller 52, is pressing against the said printing plate, after the table 2:: with the plate 2|; thereon has been raised by'the above described means actuated by the hand wheel W; and further assuming that it is desired to shave the said plate from .933" to a conventional type-high thickness or .918", the bed 24 carrying the plate will be moved in a vertical plane by means of the hand shave .015" from the said plate, the indicating means of the calibrated meter 13'meanwhile denoting that after the table is reciprocated past the knife 5?, the printing plate will be .918! in thickness. One of the buttons of the switch mechanism mentioned above may now be pressed, thus completing a circuit simultaneous ly, energizing the'motor M and the solenoid 60 which, in the relative position of parts shown in Figure 1, will at once raise the-plunger 59 and lower the pivoted knife 5'! into operative position, and also move the table in adirection from left to right, bringing the printing plate 2| secured thereon against the cutting edge of the lowered knife 57, now effective for trimming the plate 2|. When the table 25 has been moved substantially to its limit or to the right hand side of the frame II, the limit switch 62 will engage the projection 62' thereby interrupting the circuit and deenergizing the motor M and theelectro-magnet (it? at the same time, the plunger of which latter will descend by gravity, thereby swinging the cutting knife 5'! about the pin 58' and out of operative position. The reversing push button of the switching mechanism may now be pressed in order to reverse the motor M to return the table to the position shown in Figure ,1, it being observed that limit 1 switch Gl during this return motion will engage projection 6| at substantially the position shown in Figure 1, thereby interrupting the circuit again and causing the motor M to be deenergized, thus bringing the reciprocating table to a stop. This completes thecycle of operation. When a comparatively short plate is secured on the table 20 which does not require the full length reciprocation of the latter, the said table can be stopped and reversed immediately after the plate has been shaved and before either of the limit switches 6|, 62, as the case may be, is actuated.

Should it be desired to further reduce the thickness of the printing plate, the hand wheel W will be turned in a clockwise direction, the meter 13 simultaneously indicating, preferably in one thousandths of an inch, the extent to, which the plate supporting member 24 has been raised thereby, relatively to the cutting knife 51, and consequently, indicating the total amount or thickness of the layer of metal that will beshaved from a printing plate after being operated upon.

After the amount of metal to be removed is de- 7 cided upon, the switch mechanism will be actu ated to lower the knife 51 into cutting position and to reciprocate thetable 20 in the manner described above.

As best shown in Figure 3, the dial of the meter 13 is provided with two coordinated scales 85, 86, respectively, over which travel their respective indicating needles or pointers 86.

denote in highly amplified form actual verticalmovements of the plate supporting member 24 and, consequently, of the printing plate thereon, while the smaller pointer 86' which is actuated simultaneously with the large needle 85 gives roughly an indication of the total vertical movement of the table 24. It will be evident from the foregoing description that when the upper surface of the printing plate 2| is level with the lower extremity of the knife 51, the thickness of the said plate may be determined by the indicating means of the calibrated meter 13, while further elevation of the printing plate by the means referred to above, will serve, when the table 20 is subsequently reciprocated from left to right,.as viewed in Figures 1 and 2, to remove a layer of metal from the printing plate to the predeter be embodied in other specific forms without de-v parting from the spirit or essential attributes thereof, and itis therefore desired that the present embodiment be considered in all respects as illustrative and not restrictive, reference being had to the appended claims rather than to the foregoing description to indicate the scope of the invention. 1 i

What I claim is: V V

1. In a device of the character described, the combination of a frame, a table slidably supported on said frame and adapted to receive a plate, power operated means for reciprocating the table, means automatically effective for deenergizing the power means at each alternate reciprocation of the said table, and plate shaving means normally inoperative but automatically effective upon a forward reciprocation of the table to engage the plate on the table and shave same, said plate'shaving means being electro-magnetically controlled.

2. In a device of the character described, the combination of a frame, a table slidably mounted on said frame and adapted to support a plate, an electric motor for reciprocating the table, electro-magnetically controlled plate shaving means, mechanically actuated means for, deenergizing the electric motor at each reciprocation of the table, and other means simultaneously effective with the energization of the electric motor to operatively engage the plate shaving means with the plate at each alternate reciprocation of the table. 7

3. In a device of the character described, the combination of a frame, a table reciprocatingly mounted on the table and adapted to receive a plate. plate hold-down means adjustably mounted on the frame, a solenoid for raising and lowering the plate shaving means into and out of operative position, plate shaving means arranged on the frame, manually operable means for raising and lowering said table, power driven means for reciprocating the table, and other means automatically effective for deenergizing the power driven means at each reciprocation of the table and the solenoid at each alternate reciprocation of the table.

4. In a device of the character described, the combination of a frame, a member reciprocatingly mounted on said frame and adapted to support a plate, screw threaded means for reciprocating the member, plate shaving means adjustably mounted on the frame, manually operable means for raising and lowering said member relatively to the plate shaving means, and a spring and an abutment coacting with said spring for taking up lost motion in said manually operable means; said abutment being mounted on the manually operable means.

5. In a device of the character described, the combination of a frame, a table reciprocatingly mounted on said frame and adapted to support a plate, plate shaving means movably mounted on the frame, power driven screw threaded means for reciprocating the table, manually operable means including inclined plane surfaces for moving the table relatively to the plate shaving means for shaving different thicknesses of metal from said plate, a plate hold down device movably mounted on said frame, spring means for maintaining a bias on said device both in lowered operative position and in raised inoperative position, resilient means for preventing lost motion in the manually operable means, and other means for automatically moving the plate shaving means to operative position at each alternate operative reciprocation of the table.

6. In a device of the character described, the combination of a frame, a table slidably mounted on said frame and adapted to support a plate, an adjustable plate hold-down assembly including resilient plate engaging instrumentalities, electro-magnetically controlled plate shaving means, threaded means for reciprocating said table, manually operable means including a spring biased shaft and coacting inclined surfaces for adjusting said table to various heights, and a pair of limit switches, each of said limit switches being alternately effective at each reciprocation of the table to bring same to a stop automatically.

7. A combination as specified in claim 1 wherein said table is provided with plate engaging means adapted to yield in a vertical plane with the printing plate as said printing plate is operatively engaged by said plate shaving means.

8. In a device of the character described, the combination of a frame, a plate supporting means reciprocatingly mounted on said frame and adapted to support a plate, plate hold-down means swingably mounted on said frame, resilient instrumentalities for maintaining a pressure on the plate hold-down means when in lowered operative position and for maintaining the plate hold-down means in upright inoperative position, and plate cutting means engageable with a printing plate positioned on the table, said cutting means being electrically controlled.

9. In a device of the character described, the combination of a frame, a table slidably and reciprocatingly mounted on the frame, means for actuating said table, plate hold-down means engageable with a plate positioned on the table, resilient instrumentalities for normally maintaining a follow-up pressure on said plate holddown means, and for maintaining the plate holddown means in upright inoperative position when desired, and manually operable means for raising in a vertical plane a portion of the table whereon the said plate is positioned, said means including at least a pair of members, each of said members having inclined plane surfaces, and instrumentalities for moving one of said inclined surfaces relatively to the other.

10. In a device of the character described, the combination of a fixed frame, a plate supporting table slidably mounted on said frame, said table being composed of a pair of sections, one of said sections being movable relatively to the other, manually operable means having a mechanical connection to one of the said sections for moving same relatively to the other of the sections in order to raise and lower the said last mentioned section, plate hold-down means pivotally mounted on said fixed frame, resilient means for maintaining a follow-up pressure on the hold-down means while same are optionally in horizontal operative plate hold-down position or in inoperative vertical position, and cutting means engageable with said plate, said cutting means being electrically controlled.

11. In a device of the character described, the combination of a frame, a table reciprocatingly mounted on the frame and adapted to support a printing plate thereon, means connected to said frame for reciprocating the table, cutting instrumentalities mounted on the frame and movable in a vertical plane relatively to said table, threaded means connected to a portion of the table for raising and lowering the same to engage the printing plate with the cutting means, and other means including limit switches for deenergizing the table reciprocating means at each alternation of said table.

12. In a plate shaving machine, a plate stop adapted to form an abutment for a plate being shaved, and a mounting for said stop permitting its movement in a substantially vertical plane with movement of the plate.

13. In a plate shaving machine having a plate supporting member and plate shaving instrumentalities, plate engaging means arranged on said member and adapted to form an abutment for a plate positioned on the member, and a resilient mounting for the means, said means moving with said plate and in a direction substantially at right angles to the movement of said plate supporting member when said plate is being shaved by the said instrumentalities.

14, In a plate shaving machine having a member adapted to support a printing plate and plate shaving means, a plate stop secured to said member and adapted to engage and move with a plate being shaved thereon, and resilient means for adapting the said stop to maintain a continuous yielding engagement with the plate while being pressed towards the plate supporting member during the operation of shaving.

WILLIAM F. HUCK.

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