US1591827A - Semiautomatic stereotype-plate finishing and cooling machine - Google Patents

Description

July 6 1926. C. E. HQPKiN$ SEMIAUTOMATI/C KS'I'EJREOTYPE PLATE FIN ISEING AND COOLING MACHINE (Jriginal Filer! 1914 8 Sheets-Sheet 1 July 6 1926.

Original File! May 15, 1914 8 Sheets-Sheet 2 Znc ZW C3. 5.22 672%).

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C. E. HOPKINS SEMIAUTOMATIC STEREOTYPE PLATE FINISHING AND COOLING MACHINE.

Original Filed May 15, 1914 8 Sheets-Sheet 5 ozvz Whiz;

8 Sheets-Sheet 4 INN NR1 Ow 3 Ju y 6, 1926.

C, E. HOPKINS SEMIAU'IOMATIC STEREOTYPE PLATE FINISHING AND COOLING MACHINE Orifiinal Filed May 15 191 1914 8 Sheets-Sheet 5 July 6 2926: v

C. E. HOPKENS SEMIAUTOMATIC STEREOTYPE PLATE FlNISHING- AND COOLING MACHINE Original Filed May 15,

July 6 1926.

C. E. HOPKINS SEMIAUTOMATIC STEREOTYPE PLATE FINISHING AND COOLING MACHINE Original Filed y L91 8 Sheets-Sheet 6 July 6 1926. 1,591,827

c. E. HoPKaNs SEMIAUTOMATIC STEREOTYPE PLATE FINISHING AND COOLING MACHINE Original Filed May 1 1914 8 Sheets-Sheet 7 July 6 1926.

C. E. HOPK!NS SEMIAUTOMATIC STEREOTYFE PTJATE FINISHING AND COOLING MACHINE Original Filed May 15,

1914 8 Sheets-Sheet 8 .Itented July 6, 1926.

UNITED STAES PATNT OFFICE.

CHARLES E. HOPKINS, OF IPLAINFIELD, NEW JERSEY; THE PLAINFIELD TRUST COM- PANY ADMINISTRATOR 0F SAID CHARLES E. HOPKINS, DECEASED.

SEMIAUTOMATIC STEREOTYPE-PLATE FINISHING.- AND COOLING MACHINE.

Original application filed May 15, 1914, Serial No.

16, 1919, Serial No. 317,963.

This is a division of my Patent No. 1,330,942 granted Feb. 17 1920, on an application originally filed May 15, 1914, Serial No. 838,647.

Among the features of my present invention are means carried by the core for aligning the plate with a finishing mechanism, and means by which the plate starts the mechanism through one cycle of operations; means for revolving a tool carrying and a tool operating cam ring at dissimilar speeds so that the riser separating tools will follow each other in sequence; means for allowing the riser to tip so as to free itself from its support and allow the finished plate to advance to the cooler, means whereby the plate holder in the finishing machine operates a plate stop in the cooler, and elements in the cooler for allowing the plate to contract and expand.

The invention also involves improvements in details of construction of the parts thereof.

Reference is to be had to the accompanying drawings in which Fig. 1 is a side elevation of the machine with a cast plate shown resting on the plate lifting roller, and in position to move into the finishing mechanism;

Fig. 2 is a plan view of the finishing mechanism with the finishing arch and its support removed, a portion of the shaving knife shaft broken away, and the trimming mechanism sectioned;

Fig. 3 is a central longitudinal section of part thereof;

Fig. 4 is a cross section on line 4-4: of Fig. 2;

Fig. 5 is a cross section on line 5-5 of Fig. 2;

Fig. 6 is a cross section taken on the line 66 at the end of the arch in Fig. 3;

Fig. 7 is across section taken on line 77 of Fig. 2,showing the mechanism in position half way through its cycle;

Fig. 8 is a cross section on line 88 of Fig. 2;

Fig. 9 is a side view of one of the arch operating toggles, and associated parts;

Fig. 10 is a cross section of the same on line 10-1O of Fig. 9;

Fig. 11 is a side view of the arch support- 838,647. Divided and this application filed August Renewed. December 19, 1925.

ing and positioning brackets with the arch plate rollers attached;

Fig. 12 is an end view thereof;

Fig. 13 is a central longitudinal sectional view of the cooling mechanism, and

Fig. 14 is a cross section thereof on the line 1414 of Fig. 13.

The mechanism is shown as supported between side frames A and B, and cross frames O and D. The casting back can be mounted on a pivot bracket fast on a cross pivot shaft which operates in bearings formed in the side frames A and B.

The finishing mechanism is such that the stereotype plate itself starts it through a cycle of operations, the plate is clamped by the arch, without the axial displacement of the said plate, the riser is separated from the type portion of the plate, and it is thereafter disposed of as will appear.

Assume that the cast stereotype plate P is left supported on the flanged rollers 150 and in alignment with rollers 90 operating in brackets formed on the cross frame C. As the plate in this position is free from the core F it starts to move down the inclined series of rollers engaging with the guide rollers 90 and passed on down until it is located on the guide rollers 91 beneath the arch 1 when it is stopped by projections J on the concave surface of the riser portion of the plate P coming into contact with a positioning stop 49.

The finishing mechanism is supported between the side frames A and B and cross frames C and D. The arch 1 is mounted on and fast to movable positioning supports 2, 2. The inner faces of the supports 2 are provided with short brackets on which are mounted the set of guide rollers 91. The supports 2 are located above V shaped projections 3 formed on the top edges of side frames A and B, corresponding V recesses are made in the underside of the supports 2. Each support 2, 2 is made fast to the top ends of two vertical rods 4, operating in bearings formed in brackets 5 and 6, made fast to each upper and inner face of the side frames. The lower ends of the rods 4 are located in bearings 7 fast to the lower inner face of the side frames.

The arch 1 and coacting guide rollers 91 and 92 are caused to rise or descend by two pairs of toggle-joints, located between each pair of vertical rods 4. The upper arm 8 of each toggle joint is pivoted to fixed brackets, one to bracket and the other to bracket 6. Their coacting arms 9 are pivoted to cross ties 101O made fast to and joining each pair of vertical rods 4. By thus pivoting the upper arm of the toggle joint to a fixed support and the lower arm to a support made fast to the vertical rods 4 the arch is drawn down by extending the toggle-joints, and raised by contracting the same.

For the purpose of removing the strain from the toggle-joints when raising the arch there are provided four counterbalance springs 11, one of which is wound about each rod 4. between the tops of bearings 7 and collars 12 fast on the rods.

The two sets of toggle joints are caused to operate in unison by links 13 and 1ft, which connect the swinging ends of the toggle-joints to the loose end of a vertical rock lever 15. This lever is fast on a. rock shaft 16, which is located in bearings formed in the cross frames C and D. This rock lever 15 is caused to rock back and forth at the beginning and end of each cycle of opera tions by a cam lever 17, also fast on the rock shaft 16. The swinging end of the lever 17 is provided with an antifriction roller which is positioned in a suitable camway formed in a cam wheel 18, mounted on a shaft 19. This cam wheel 18 is caused to make one revolution to each cycle of operations by a worm wheel 20 fast on the end of the cam shaft 19. The worm wheel is driven by a worm 36 located above the worm wheel and fast on a cross driving shaft 37 operating in bearings formed on the cross frame C. Each of the toggle-joint tie-pieces 10 is provided at one end with extensions in which are fast vertically disposed and bent rods 21. The top ends of these rods are provided with short studs upon which are mounted guide rollers 92-92.

In operation the worm wheel 20 makes one revolution to each cycle of finishing operations, first extending the toggle-joints which push down the tie pieces 10 fast on the rods 1, thereby drawing down the arch 1 which engages with the periphery of the stereotype plate. This operation lowers the guide rollers 91 and 92, and deposits the straight edges of the stereotype plate on top of four supports 93, 94, and 6262, which are aligned with, but slightly below, the top surface of the guide rollers when they are in raised position. The supports 93 and 91 are made L-shaped. The top edges of the L supports 93 and 94 act as plate holding means for supporting the plate during the finishing operations. The supports 6262 are fixed within the opening of the fixed ring support of the trimming mechanism, and are intended to support the riser portion of the plate while it is being separated by the trinnning tools as hereinafter described.

The L supports 93 and 9% are provided with recesses 2-1 in which the guide rollers 91 are located. The support 93 is fixed to extending arms formed on the fixed bracket 5.

Owing to an uneven shrinkage of the stereotype plates there is a slight variation in the length of its circumference, to compensate for which the L support 94: is made slightly movable, and is mounted on arms 9595, which are pivoted on studs fast in the ends of the fixed bracket 6. This pivoted L support 91 is held up in the normal lowered position by projections 9696, formed on the pivot arms 95, engaging against the side frame B, so that it is slightly lower than the upper face of the guide rollers 91, when the rollers are in the raised position as previously stated. But when the guide rollers 91 are lowered, by the lowering of the arch. the plate as stated, is transferred to the upward projecting arms of the L supports 93 and 94. As the arch nears its lowered operative position a pin 97 fast on the togglejoint connecting link 1 1 engages the free end of a stiff spring bar 98 fast to the lower face of the L support 9 1. This causes the support to swing up and force the curved plate solidly against the dome of the arch 1. Upon the completion of the finishing operations the connecting link 14 reverses its movement when a pin 99, fixed in the link 14, forces the spring bar 98 back and holds the L support 9st down in the lower position.

The shaving of the ribs formed on the interior of the cast plate is accomplished by a shaving knife 30, mounted on a projecting ledge 31, formed on a hollow knife shaft 32. This knife shaft 32 operates in bearings 33 and 3% formed on top of the cross frames C and D. The knife shaft is revolved by a worm wheel 35 made fast to the end of the shaft, and in front of the bearing 33. This worm gear is located above and in mesh with the driving worm 36, which, as stated, is fast on the cross driving shaft 37, mounted in bearings formed on the face of the cross frame C.

A clutch mechanism is provided and arranged so as to engage and disengage the driving shaft with a constantly driven pulley 38, which is mounted so as to revolve about the front end of the driving shaft 37.

The clutch mechanism I employ is well known in the trade and therefore does not need explaining. The driving member 3!) of the clutch is fast to the pulley 38 and the driven member 10 is fast to the driving shaft 37. A yoke 11, pivoted above the shaft mem ber 10 to the cross frame C operates in a groove formed in the shaft member. This lllll lllS yoke 41 is caused to swing back and forth to engage and disengage the clutch members by a spring rod 42, one end of which is pivoted to the yoke and the other end supported in an eye bolt 43, fast in the cross frame 0. Mounted on this rod 42 in front of the eye bolt is a coil compression spring 44. The spring 44 is held under tension by a collar fast on the rod 42. The function of this spring is to force the clutch members into engagement.

A trip mechanism, operated in connection with the shaving knife shaft, causes a trip arm 45 to engage with a pin 46, located on the spring rod and push the rod back against the action of the spring 44 at the end of each cycle of operations. This trip arm 45 is located in a bearing made through the rim of the worm gear 35 so'that it rotates with the gear. The engaging end of this arm 45 is bent down so as to project in front of the trip pin 46. The opposite end of the arm 45 is fast in a connecting bracket 47 which is fast on the end of a long rod 48 located in the hollow of the knife shaft 32 and slidingly operative in bearings in the ends of said shaft.

As previously stated the starting of the finishing mechanism is accomplished by the movement of a stereotype plate into position to be finished. The stereotype plate P is cast with projections J on its concave surface located beneath the riser. These projections J extend in front of a stop 49 slidingly mounted on a bearing formed on the knife shaft, and made fast to the end of a slide block 50 operating through a slotted opening in the knife shaft and attached to the long rod 48. A buffer spring 51 is wound about the long rod 48 between the block 50 and the bearing 52 of the rod 48. (See Fig. 3.)

\Vhen a stereotype plate is freed from the core it comes gliding down over the antifriction core-lifting rollers 150, and over guide rollers 90 and 91, and engages its projections J against the sliding stop 49 with considerable force and pushes the stop back against the action of the buffer spring 51 until the block 50 comes up against the end of the slot in which it operates. At this time the stem 53 of a spring latch 54 on the sliding stop 49 passes beyond the end of the sliding stop bearing, and is pushed out by the spring. It engages the edge of the bearing, and holds the stop in the advanced position against the rebound action of the buffer spring, see Figs. 3 to 7.

This moving of the sliding stop 49 has slid the trip arm 45 from in front of the trip pin 46, leaving the spring 44 free to push the clutch member into engagement and start the mechanism going through its cycle of operations. The driving shaft revolves the worm which in turn revolves both worm gears 20 and 35, causing the arch to come down on top of the plate and the sliding stop 49 to move around from in front of the projections J on the plate. But when the mechanism is about half through its cycle, as shown in Fig. 7, the end of the stem 53 of the spring latch 54 engages a face cam 55, fast on the underside of the bearing 34, and is pushed back. WVhereupon the buffer spring once more comes into action and pushes the long rod 48 back into the starting position and as the cycle nears its end of operations the trip arm 45 once more engages the pin 46 and forces it back thereby disengaging the clutch members and stopping the mechanism.

The trimming mechanism for separating the riser from the type face portion of the plate is located in front of and axially aligned with the arch 1 when the arch is in the lowered position. The trimming mechanism is mounted on a flanged ring bearing fastened to the cross frame D by three cap screws 61.

lVithin the hollow of the ring bearing 60 and at each side are located the fixed plate supports 62, which act to support the riser during the trimming operations. These supports are aligned with the L supports 93 and 94 and like them located slightly below the top level of the guide rollers, when they are in raised position.

Mounted on the outside of the ring hearing 60 are two toothed rings 63 and 64. Ring 63 is referred to as the tool ring and 64 as the cam ring. The cam ring 64 is located next to the flange of the ring bearing 60, and the tool ring 63 against the cam ring 64. Both rings 63 and 64 are held in position on the ring bearing 60 by the flange of a cover 65 fast to and extending about the periphery of the flange of the ring bearing. These toothed rings 63 and 64 are driven by gear wheels 66 and 67 fast on a shaft 68, operating in bearings in the cross frames 0 and D. The shaft 68 is driven by a helical gear 69, which is fast on the end of the shaft and located beneath, and in mesh with, a like gear 70, fast on the driving shaft 37.

The tool ring 63 is provided with four movable trimming tools 73 mounted in holders, located on its face and at each quarter of its circumference, and the cam ring 64 with a groove, facing the tool ring, divided into four equally disposed eccentric camways 72, joining each other into a continuous cam groove.

The tool ring 63 is so timed that it makes ten revolutions during each cycle of operations, and the cam ring 64 has one more tooth so that it makes nine and three fourths revolutions during the cycle.

A tool operating cam roller 71 is located in each of the four eccentric camways 72. These are caused to travel from the high point of each eccentric camway to its lowest advance point; and then up a steep 1ncline to the high point of the advance eccentric camway, during each cycle of operations, owing to the tool ring travelling one fourth of a revolution more than the cam ring. (See Fig. 7.)

The trimming tools Tl-l consist of steel bars formed with beveled cutting ends. The tools 73 are each fast in a sliding tool holder Tl, which operates in guideways fast to the face of the tool ring (13. Each tool holder is provided with an extension T0 which operates in a slot opening through the tool ring. See Fig. 3. A hearing is formed on the face of the extension it; upon which the cam roll 71 is mounted. See Figs. 3 and 7.

In operation, the rings are revolved through their cycle the tools advance toward and engage the periphery of the curved plate, and owing to the tools being positioned to follow each other in sequence in their advancing operations, gradually separate the riser and bevel the edge of the type face portion of the plate.

During the operation of separating the riser from the type portion of the plate the riser is held up by the supports 09. fast: within the ring support (10. rlust previously the sliding stop -19, mounted on the shaving knife shaft 32, has been revolved from in front of the projections J on the riser and the shaving knife 30 has shaved oil the ribs cast beneath the type face portion of the plate making the same the proper thickness.

As the revolution of the knife shaft continues. the sliding stop is brought up into the original position, but to the rear of the projections, J, as shown in Fig. 5, and leaves the riser free to tip forward over the ends of the fixed supports 02 and slip down through the gap between the cross frame D and the end of a cooling device located in front.

As the riser is now separated and out of the way, the toggle-joint tie piece 10, which supports the two guide rollers 02tl2. moves the rollers up, thus closing the gap through which the riser passed out. Shnultaneously with this movement, the arch is raised and the guide rollers lift the now finished stereotype plate off the L supports. leaving it free to glide down the inclined guideway over the antifriction guide rollers 91 and 02, and pass over the rollers 80, on over the top edge of a cooler sink 81 on a set of guide rollers 82. The rollers are mounted in front of the cooler sink and the rollers 82 on studs located within and at each side of the sink. (Figs. 1, 13 and 1 1-.)

The cooling device illustrated comprises the sink 81 fastbetween the side frames A and B, and located in alignment with the finishing mechanism. Each inside wall of the sink is provided with a set of the flanged guide rollers 82 for supporting a finished stereotype plate, during the cooling operation. Located longitudinally and above the sink S1 is a tube 83, closed at both ends.

This tube is supported by brackets 81, and

85 fast to the end walls of the sink. The tube is provided with a slotted opening 80 on its top side. 70'T0 are made fast to the tube at each side of this slot; 80. The free ends of each wing are provided with a.- stitlening piece ST, 87 on which are extensions 88. Each extension 88 is termed with a slot in which is located a pin 8!), fast to the end of tour of the flanged guide roller studs. See Fig. 13. The periphery of each flanged guide roller 82 is formed with a slightly flat surface 100, and a bevel surface 101.

Cooling water is admitted to the chamber in the tube 83 through a supply pipe 102, let in through the lower closed end. The water passes out of the tube through the long slot 80, made in the top side of the tube, and ttows down over the curved flexible wings '79 into the sink out of which it passes through a waste pipe.

As stated, a finished stereotype plate glides down from the finishing mechanism over the guide rollers 91, 92, and 80, and over the cooler sink 81 011 the beveled rollers S2, and over the flexible wings until brought up by a movable stop 103.

\Vhen the cooling water comes into contact with the interior surface of the plate, now located over the flexible curved wings. and resting on the tlat of the beveled guide rollers 82, the plates interior begins to shrink, which action causes the straight edges of the plate to draw in; whereupon they leave the flatof the periphery of the guide rollers and move down the bevels, which causes the plate to lower itself upon the curved exterior of the cooler. As the shrinkage continues the flexible wings close in and the straight edges continue to move down the bevel of the rollers. But as the cooling operation progresses through the plate its outside commences to contract and gradually draws the straight edges back up the bevels of the rollers until they once more rest on the flat surface and the plate has returned to its original curvature.

The plate remains upon the cooler guide rollers 82 until the next finishing operation begins, when, through connections with the arch moving mechanism, the movable stop 103 is lowered and the plate is free to move off the cooler down the guide rollers 82 and over rollers lOl positioned in recesses formed on two plate receiving brackets 10:"). It is lifted by the operator from these brackets, all finished and cooled ready to be attached to the printing press cylinders.

The movable stop 103 is supported in a pair of ways 106 fast on the lower end Flexible curved wings of the cooler sink 81. It is moved up or down by a rock lever 107, fast on a rock shaft 108, operating in bearings formed in the plate supporting and receiving brackets 105. A rock lever 109, fast on the end of the rock shaft 108 is pivoted to one end of a connecting rod 110. The opposite end of this rod is pivoted to a vertically disposed arm 111 of a crank lever, which is mounted on a stud fast in the side frame B. A second arm 112 of the crank lever engages with a pin 113, fast on the adjacent bent guide roller rod 21 which is fast to the tie piece 10 of the adjacent toggle-joint. By thus connecting the movable stop with the toggle-joint tie piece it is caused to move in unison with the up and down movement of the arch.

Although I have shown and described a preferred embodiment of the invention, I am aware of the fact that many modifications can be made therein by any person skilled in the art without departing from the scope of the invention as expressed in the claims. Therefore, I do not wish to be limited in these respects, but what I do claim is 1. In a stereotype plate finishing machine, the combination with plate supports and finishing tools, of means for operating the tools, a longitudinally slidable plate positioning stop and trip, and means whereby the positioning of a plate automatically starts the mechanism through a cycle of operations.

2. In a curved stereotype plate finishing machine, the combination with finishing tools and means for operating the said tools, of a positioning stop for the plate located inside the concavity of the plate, a trip for starting the tools, and means by which the positioning of a plate causes the trip to start the mechanism.

In a stereotype plate finishing machine, the combination of finishing tools, means for intermittently operating the tools, a movable stop, and means whereby the movement of the stop starts the finishing mechanism through a cycle of operations for the purpose set forth.

4. In a curved stereotype plate finishing machine, the combination of a plate supporting arch, a movable shaving knife shaft located beneath the arch, a trimming tool support aligned with the arch, and means for revolving and advancing the tool radially toward and through a curved plate located between the arch and shaving knife shaft.

5. In a curved stereotype plate finishing machine, the combination of means for supporting a curved plate, edge beveling and trimming tools, and means for revolving the said tools around the periphery of the curved plate and simultaneously advancing the same toward and through the said plate and thereafter retracting them for the purpose set forth.

6. In a curved stereotype plate finishing machine, the combination of a tool support, a tool carrying ring and a cam ring located on said support, a movable tool holder located on the tool ring and operated by the cam ring, and means for revolving both rings at dissimilar speeds, for the purpose set forth.

7. In a substantially horizontally disposed curved stereotype plate finishing ma chine, the combination of a movable shaving knife, a plate supporting arch above the knife, plate supports beneath the arch, a riser supporting and separating means at one end of the arch, and means for allowing the riser to tip in a vertical direction and free itself from the riser supporting means for the purpose set forth.

8. The combination of a curved stereotype plate finishing machine with a cooling device aaially aligned therewith, and means for guiding a finished plate from the finishing machine to the cooling device, said parts being so located and arranged that the riser portion of the stereotype plate is caused to tip endwise and move down freely so the finished plate can advance to the cooling device.

9. In a curved stereotype plate finishing and cooling machine, the combination of means for finishing a stereotype plate, a cooling means, flexible wings on the cooler, and cone-shaped rollers aligned with the free sides of said wings for the purpose set forth.

10. In a curved stereotype plate finishing and cooling machine, the combination of means for finishing a stereotype plate, a cooling means, means for guiding a finished plate to the cooling means from the finishing means, a cooling supply chamber and coneshaped guide rollers aligned at each side of the said supply chamber and having cylindrical portions at the bases of the cones and continuous there-with for the purpose set forth.

11. In a curved stereotype plate finishing and cooling machine, the combination of means for finishing a plate, means for holding a plate while being finished, a cooler, means for guiding a finished plate through the finishing mechanism to the cooler, means for stopping the plate over the cooler, and a plate receiver aligned with said cooler, the plate stopping means being operated by the holding means for the purpose set forth.

12. In a stereotype plate finishing and cooling machine, the combination of means for finishing a plate, means for holding a plate while being finished, a cooler, means for guiding a finished plate through the finishing mechanism to the cooler, and means for stopping the plate over the cooler, the

plate stopping means being capable of being operated by the holding means.

13. In a stereotype plate finishing and cooling machine, the combination of a cooling means, means for guiding a plate to the cooling means, a cooling supply chamber and guide rollers aligned at each side of the said supply chamber, having cylindrical portions for receiving the edges of the hot plates and conical portions at the inner ends of the cylindrical portions down which the edges of the plates slip as they shrink so that they are lowered.

14. In a curved stereotype plate cooling machine. the combination of a cooling means, means for guiding a plate to the cooling means, flexible wings on the cooler, and cone-shaped rollers aligned with the tree sides of. said wings.

15. In. a cooling machine for curved stereotype printing plates, the combination with a cooling means. of a runway extending thereto along which a plate is adapted to travel on its straight edges, a stop lo- 'ated at the bottom of the runway and adapted to be engaged by the forward edge of the plate to stop it in proper position in the cooling device, a lever for moving said stop up into position to engage the plate and stop it. supports along the runway at a distance from the cooling mechanism for the plates, said supports being vertically movable. means for moving said supports up and down. and means connected with the support-moving means for operating said lever.

16. In a machine for finishing curved stereotype printing plates, the combination of a runway for supporting the plates on their straight edges, a pair of supports along said runway for carrying the plates, vertically-movable rods on which said supports are carried, means fixed to said rods for causing them to move in unison, a toggle lever construction for moving the last named means up and down to raise and lower the supports, a shaving knife shaft, a second shaft connected therewith, and means on the second shaft for operating said toggle levers.

17. In a curved stereotype plate finishing machine, the combination with a runway through which the plates are adapted to pass comprising means for supporting the plates on their opposite edges. a stop slidably mounted and projecting above said supporting means in position to be engaged and moved by a plate moving down the runway. a rotatable shaving knife shalt. a pin mounted to slide with said stop but rot atable with the shaving knife. shaft. and means adapted to be engaged by the pin at the end of a revolution of the shaft. provided a plate is in engagement with the stop. for disconnecting the shaving knife shaft from a source of power.

18. In a machine for finishing curved stereotype plates the combination of a support for an end-trimming tool, a tool carrying ring, and a cam ring located on said support, each being provided with a gear. said gears being of the same size but one having more teeth than the other, gears of the same size mounted to rotate together for rotating said two gears, whereby one of the rings will rotate a little faster than the other. and a movable tool-holder located on the tool-ring.

19. In a machine for finishing curved stereotype printing plate. the combination with a runway, of an arch for receiving the plate on the runway, means for shaving its interior and cutting off the riser, and a cooling device located at a distance from the arch along the runway leaving a space between them for receiving the riser. where by when the riser is cut oil it will drop down through said space instead of going into the cooler.

In testimony whereof I have hereunto allixed my signature.

CHARLES E. HOPKINS.

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