US1518904A - Machine for making printing plates - Google Patents

Description

Dec. 1924. 1,518,904

J. 5. DUNCAN MACHINE FOR MAKING PRINTING PLATES Filed Sept. 11, 1922 3 Sheets-Sheet J Dec. 1924- 1,518,904

J. 5. DUNCAN MACHINE FOR MAKING PRINTING PLATES F iled Sept. 11, 1922 3 Sheets-Sheet 2 J.S,DUNCAN MACHINE FOR MAKING PRINTING PLATES Filed bept. 11, 1922 3 Sheets-Sheet 5 flxL F L Patented a. 9,1924.

UNITED STATES 1,518,904 PATENT OFFICE.

JOSEPH S DUNCAN, OF CHICAGO, ILLINOIS, ASSIGNOB '10 ADDRESSOGRAPH COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

MACHINE FOR MAKING PRINTING PLATES.

Application filed September 11, 1922. Serial 587,278.

useful Improvements in Machines for Making Printing Plates, of which the following is a specification.

This invention relates to machines of the general type disclosed in my Patents No.

' 921,600 patented May 11, 1909, and No.

955,116 patented April 12, 1910, which are employed for pressing or stamping printing characters in relief on printing plates. And the principal object of the present invention is to provide'a machine with a plurality of keys arranged in a keyboard for operation like a typewriting machine at a comparatively high rate of speed and without requiring any special mechanical skill or instruction.

' A further object of the invention is to provide a keyboard machine for making printing devices of the kind referred to in my prior patents which embodies a rotating die head carrying a plurality of punches and dies in pairs arranged to make an impression upon an interposed plate and adapted to be operated entirely from the keyboard, there being groups of automatic and safety devices embodied in the machine to enable it to be operated rapidly and by the comparatively simple manipulation of the keys similar to an ordinary typewriting machine.

A further object of the invention is to provide the machine with safety devices whereby one key only can be operated at a time and whereby the complete cycle of operation must he proceeded with upon the depression of one key before any other key can 'be depressed, except in special cases, and also to provide manually operated means whereby a key may be restored to normal position without the necessity of completing the cycle of operation of the other parts of the machine.

Other objects of the invention are to pro vide a normally rotating die head having means for accurately stopping the head and for locking the head to make an impression from a selected die and punch; to automatically release the head as soon as the impression is made so that its rotation may be resumed; to quickly restore the depressed key to normal position when its punch and die have operated; to arrange the several groups of mechanism so that they will operate in proper sequence and quickly to enable rapid operation of the machine and to provide means for insuring proper operation of the machine and to prevent irregular operation or jamming of the parts.

And the invention also has for a primary ob ect the provision of a keyboard machine adapted for rapid operation for making printing plates which can be sold to the trade generally for use as an office appliance to be operated by young people having no mechanical experience and which will require very little instruction beyond mastering the keyboard which may conform to the standard keyboard in use on typewriting machines. In the accompanying drawings illustrating a selected embodiment of the invention and which I have found satisfactory in practical use Fig. 1 is a front elevation of the machine, partly in section;

Figs. 2, 3 and 4. are sectional views on ghe lilnes 2-2, 3-3 and 44 respectively of Figs. 2 and 2 are detail views partly in section;

Fig. 5 is an enlarged view of the die head locking devices;

Fig. 6 is an enlarged elevation of the key locking and restoring devices;

Fig. 6 is a detail view;

Fig. 7 is a side elevation of the manually operated. key restoring means.

Referring to the drawings the main frame 10 is mounted on a suitable base 11 which may be supported on legs 12 or in any other suitable manner. A die head 13 is mounted in the frame to rotate about a vertical axis. A pulley 14.- (Fig. 4:) communicates power from any suitable source to a main driving shaft 15 which is provided with a bevel gear 16 meshing with a bevel gear 17 on a vertical shaft 18 which drives the die head through a suitable friction device 19. The die head carries a plurality of dies 20 and punches 21 arranged in complementary pairs and movably mounted therein and adapted to be operated to make an impression (stamp a die character in relief) on an interposed plate which is caused to travel by step by step or other movement along atable 22 and is carried by a carriage which it is not considered necessary to illustrate in this application. A punch stock 23 is slidably arranged in the mainframe to enga e a punch 21 and a die stock 24 is forme on the die shuttle arm 25 to engage the cor-1 res onding die. This arm is pivoted at 26 an it sup orts the shuttle 27 which is adapted we ide back and forth thereon and is engaged in 0 erative position by an'anvil 28 carried by t e head 29 of a rock lever 30 which is also ivoted at 26. The head 29- is operated by t 1e toggle 31 which is pivoted to the main frame at 31 and is operated by the shaft 32 (Fig. 4') which is in turn operated by the pitman rod 33 and the ec-.

centric 34 on the main driving shaft 15, or in any other suitable manner. The toggle rotates continuously except during the impression movement of a pair of punches and dies, and the toggle preferably operates continuously also. The shuttle 27 1s provided with a recess 35 which is disposed opposite the anvil 28 under normal conditions to prevent the anvil from depressing the die stock to o erate a die, but when the die shuttle has. een projected to the right in Fig. 1, to bring the seat 36 thereof in alignment with the anvil 28 the shuttle will be depressed, the arm 25 will be rocked on its pivot and the die stock 24 will operate a die, the rotation of the head having by that time been stopped and the head locked against movement while the punch and die are being operated. An arm 37 on the shuttle arm 25 is provided with a stop screw 38 adapted to be adjusted to en age the main frame or other fixed part to Timit the upward movement of the die shuttle. A

spring 39 is connected to the arm 37 and to the main frame and tends to hold the die shuttle in elevated position, as shown.

A- punch shuttle 43 is slidably mounted on the head 44 carried by the lever 45 which is pivoted at 46 on the main frame and is operated by crank pin 47 and connecting rod 48 on the main driving shaft 15. The head 44 is carried by a rod 49 slidably mounted in the lever 45 and normally held in raised position by the spring 50. The lever 45 constantly operates like the toggle 31 and the die head, and the punch shuttle has a recess 51 and corresponding with the recess 35 in the die shuttle so that the punch stock 23 will be engaged only when the punch shuttle is moved to the right in Fig. 1 in alignment with the punch stock.

A link 53 connected to the die shuttle and v a link 54 connected to the punch shuttle are pivotally connected to a rock lever 55 which is pivoted at 56 on the main frame. A sprlng 57 is connected to one arm 58 of the rock lever 55 and to the main frame to hold the shuttles normally out of operative position, as shown in Fig. 1. Y

The die head is normally rotating, as

stated, and means are provided for quickly and accurately sto pin the head and for preventing any re oun A hollow shaft 59, Figs. 1,3, 9, is rigidly secured to the head and rotates therewith.

An arm 60, Fig. 2, rigid on the shaft 59 has a striker 61 arran ed above the circular series of stops 62 slidmgly mounted in the ring '63 which is secured to the base 11 by bolts 64 or other suitable means, Fig. 1. The stops are each connected by spring 65 with a ring 66 which is supported in spaced relation to the ring 63 by rods 67. The stops are lifted against the tension "of their springs by corresponding key bars 68 (Fig.

4) which are pivoted at 69 on posts 7 O and carry keys or finger pieces 71 on their outer ends which are preferably arranged in substantial accordance with a standard key board. When a key is depressed its key bar is rocked and its stop is lifted into the path of the striker 61 and since the arm 60 is rigid with the shaft 59 and the latter is rigid with the die head it follows that the die head will come to rest when the striker en 'ages the lifted stop.

To prevent any rebound of the head when the striker engages a stop "a pawl 72 (Fig. 2) is pivoted at 73 on the extension 74 of the striker arm 60 and a spring 75 pulls the pawl inward-1y in position to engage that side of the lifted stop opposite to the striker 6-1. The pawl has an inclined face 77 which will first engage the lifted stop and cause the pawl to swing outward against the tension of spring 75 but the parts are so proportioned that when the striker engages one side of a lifted stop the inclined face of the pawl will have passed by the stop so that the lip 76 of the pawl may be engaged with the stop under the action of the spring 7 5. Since the action of the pawl is practically coincident with the engagement of the striker with a lifted stop and since the engagement of the pawl with the stop will prevent any rebound of the die head it will be understood that when the die head is brought to a stop it is a dead stop without any rebound o-r vibration, and this is highly desrable for accurate work.

The pivot 73 for the pawl is preferably located beyond the circle of the stops to facilitate the operation of the pawl. It is desirable to have the shuttles and the punchand die corresponding with the depressed key operate immediately when the die head is stopped by depressing a key, and quickly so that the machine may be operated at considerable speed. The lower free end of the rock lever 55 is loosely connected with one arm of the bell crank lever 78, Fig. 1, which is pivoted at 79 on a bracket 80 sesured to the base 11 and carries at the end of its other arm a pivoted bearing 81 for a rod 82 which. extends through the plug 83 in the lower end of the hollow shaft 59 and projects upwardly even with the stop arm 60. The rod 82-carries a collar 84 between the pivot 81 on the lever 78 and the arm 85 fastened to said lever so that the rod normally holds the latch in position to en gage the upper end of the rod 82-with its free end projecting rt way across the circle of the stops ant slightly in advance of the striker. The face of the striker is raised at 61 to permit the outer end of the latch to seat therein when the latch is swung on its pivot by engagin with a lifted stop to release the rod 82. his seating of the end of the latch in the recess of the striker permits the striker to engage the lifted sto at the same time that the rod 82' is release by the swinging of the latch. And when the latch 86 is withdrawn front engagement with the rod 82 the spring 57, Fi 1, is enabled to rock the bell crank lever 78 and the shifting lever to shift the shuttles into operative position so that the next movement of the toggle 31 and the lever 45 will cause the die and punch corresponding with the key that has been depressed to cooperate and produce a type character on the interposed plate.

' To return the shuttles to their normal inoperative position and also to return the rod 82 to position for engagement with the latch 86, I provide a lever 93 (Fig. 1) which is pivoted at 94 on the main frame and carries a kicker 95 pivoted to its lower end 96. This kicker rojects between the springs 97 and 98 on t e guide 99 carried b the lever 93 and consequently it has a yiel ing movement on'its pivot in both directions. The forward free end of the kicker is wedge-shaped or tapered and it normally lies beneath the die shuttle but is arranged to enter a notch 102 in the die shuttle when the latter is lowered in its operating movement. A link 103 is connected with the toggle and with the lever 93 so that the kicker is continuously operating with the toggle. It will be recalled that when the shuttle die moves to operative po sition it slides to the right, Fig. 1, and moves downward, and during this movement the yieldingly held kicker enters the slot 102 so that immediately after the impression operation and when the toggle flexes, the kicker is caused to pushthe die shuttle back to its normal positlon and in so doing the punch shuttle is returned to its normal position in these arms by means of and the rod 82 is lowered for engagement with the latch.

It is desirable to prevent o eration of a second key before the comp etion of the cycle of operation produced by depressing one key and it is likewise desirable to return a depressed key to normal position as quickly as possible after it has performed its function. To accomplish these results I provide a pair of arms 104 and 105 which project forward alongside the keyboard, Fig. 2; and a key locking bar 106 is pivotally mounted intles 107 and 108. This key-bar has a ownwardly inclined flange or blade 116 and an upwardly inclined flange or blade 117 (Fig. 6). A lug 109 on the flange 116 is arranged to engage a pin 110 on the arm 104 to limit the movement of the key bar under the influence of spring 111 which is attached at 112 to the arm and at 112 to the flange 116 below the intle 107. Each key bar is provided Wit 1 a downwardly projecting leg 113 which has an inclined lower end 114 turned over to provide a smooth footing for engagement with the flange 116 of the locking bar. When a key is depressed to raise a stop the locking bar is rotated clockwise by engagement of the leg 113 with the flange 116 and as the downward movement of the leg continues the edge 116 of the flange 116 engages the shoulder 119 on the leg. At the same time, the upper flange 117 of the key bar swings into engagement with the shoulders 118 of all the other key bars. The construction is such that the shoulder of the key bar which is depressed will clear the flange 117 before the latter engages therewith, so that at the completion of the depressing movement of a key the depressed key will be locked in lowered position by engagement of the flange 116 of the locking bar with the leg 113 of the depressed key bar, and all of the other key bars will be locked in normal position by engagement of the flange 117 of the locking bar with the shoulders of the other key bars.

To release the key bars from the locking bar which holds the depressed key and all the other keys in locked position I provide a release bar 120, Figs. 4, 6, which is carried below the key bars by link 121 and a bell crank 122 pivoted at 122' on a fixed part of the machine. A pawl 123 1s pivoted to the release bar and a spring 123' normally holds the pawl in approximately the position shown in Figs. 4 and 6 beneath the flange 116 of the locking bar and in engagement with the lower edge 116 thereof. The die shuttle arm 25 is provided with an extension 25' (Fig. 1) WlllCh is connected by a link 125 with an arm 126 of the bell crank 122 (Fig. 4). When the die shuttle arm is lowered in the operation of making an impression the link 125 is also lowered to swing the bell crank 122 and thereb thrust the release bar 120 to the right in igs. 4 and 6 until the edge 127 of the pawl 123 engages the lower edge 116 of the flange 116 of the looking bar. Then when the die shuttle arm rises after making the impression the release bar 120 is thrust to the left in Figs. 4 and 6 and the pawl 123 rocksthe 100 in bar until it is released from the le 113 o the depressed key, and at or about t e same time t e awl disengages itself from said flan e. T on the spring 111 returns the key lockmg bar to normal position, releasing the keys which were not depressed and the spring retracts the lifted stop.

To return the depressed key to normal position I provide a key replacer 128, Figs. 4 and 6, which extends transversely of the ke board below the key bars and is provided with a pad 129 to engage the lower edge of each key bar. The replacer is pivoted at 130 on the arm 104 and it has a shoulder 131 to be engaged by a pawl 132 carried by the releasesbar 120 and operatin simultaneously with the .pawl 123.

en the release bar moves to the right, Figs. 4 and 6, the pawl 132 is raised by the spring 134 connected with the release bar 120, into engagement with the shoulder 131 on the key replacer; and when the release bar moves to the left, Figs. 4 and- 6, the replacer is swung on its pivot and the pad 129 engages the depressed key bar and returns it to normal position quickly. Like the pawl 123, the pawl 132 automatically disengages from its shoulder after the operation just described and the parts assume their normal position as shown in Figs. 4 and 6. It may happen that the power is shut off or the machine is otherwise brought to a complete'rest with a key depressed, or

for any reason, it may be desired to restore the key to normal position after being depressed without proceeding through the usual cycle of operation. For this purpose I pivot an angle lever 135, Fig. 7, on a downward extension 136 of the arm 105 and provided with an arm 137 adapted to engage a projection 128 on the key replacer or operating the replacer as has just been described. Another arm 138 is arranged to engage the flange 116 for operating the locking bar 106 as has also been described. This arm 138 is preferably pivoted at 139 to the angle lever 135 and it has a pin 140 projecting into an enlarged opening 141 in the angle lever whereby the movement of the arm relative to the lever is limited. A spring 142 is connected to a pin 143 on the arm 105 and to the pin 140 and operates to hold the arm 138 in its upward position and also holds the lever 135 in its normal position, as shown in Fig. 7. The angle lever 135 is operated manually by means of the handle 144 and when so operated, by swing ing the handle to the left, Fig. 7, the lockmg lever is released from the depressed key bar andthe replacer is lifted to restore the depressed bar to normal position.

The normal resiliency of the arm 60 and the shaft 59 ma perimta slight movement of the die hea just as the lmpression is being made and this may result in an imperfeet impression or other undesirable result.

To prevent this and to lock the die head rigidl during the impression operation I provi e a lockin block 146, Figs. land 5, shdably dlSPOS o posite a series of, teeth 145 at the bottom 0 the die head and adapted to be engaged therewith as the punch and die are being moved into operation. The locking block is operated by the arm 25 through a link 147, a bell crank lever 148v and a lever 149, the latter having a sliding connection 150 at one end with the block 146. The bell crank 148 and the lever 149 are pivotally connected at 151 and an arm 152 on the bell crank has a notch 153 to receive a pin 154 on the lever. A spring 155 connects the free end of the lever 149 with the bell crank and normally holds them in the position shown in Fig. 5. When the shuttle. arm 25 lowers with the operative movement of the toggle, the extension 25' causes link 147 to swing the bell crank clockwise on its pivot and to cause the spring 155 to pull the lever 149 clockwise also and project the locking block into engagement with a pair of teeth to lock the die head. As the to gle bends the link 147 is raised to swing 5w bell crank counter clockwise, and the arm 152 engaging the pin 154 swings the lever 149 to withdraw the locking block from engagement with the teeth and thereby release the die head. Thus the die head is positively locked in rigid position during the impression operation of the punch and die and is released from locked position when the impression has been completed.

In operation, the die head is normally rotating in a counter clockwise direction as indicated by the arrow in Fig. 2 with the stop arm 60 and the latch 86 traveling over the stops; the shuttles are in retractedor idle position and the toggle and the levers 30 and 45 are vibrating in unison; the latch 86 is normally engaged with the upper end of the rod 82 to hold the shuttles in retracted position; and the keys are all free. When any key is depressed its stop 62 is raised into the path of the latch 86 and the arm 60; the latch is first released from engagement with the rod 82 and the spring 57 is then enabled to rock the lever 55 and thereby to shift the shuttles into operative position. By this time the striker of the arm 60 has engaged the lifted stop, the die head has been brought to rest, the pawl 72 has become engaged with the lifted stop and the locking bar has shifted to hold the depressed key in depressed position and the other keys in normal position.- When the toggle straightens and the lever 45 swings upward the shuttles are moved toward each other to'operate the punch and die corresponding with the depressed key for impressing a type character in an interposed plate. As the die shuttle moves downward the locking block 146 is thrust into engagement with the teeth on the die head to rigidly lock the die head during the impression operation. After the impression is made and the tog le bends and the lever 45 swings downward the locking block is withdrawn from engagement with the die head, the release bar is projected forward, to the right, in Figs. 4 and 6, to release the keys and to restore the depressed key to normal position. The kicker also shifts the shuttles i which is adapted for the production of type characters on printing plates from which impressions of high grade may be printed in imitation of typewriting or otherwise. The machine is simple to operate, it requires no mechanical experience because it is automatic in action except for the operation of the keys and they are operated in substantially the same manner as the keys of a typewriting machine.

I have not considered it necessary to show the carriage which feeds the plate through impression position because a carriage of this description is illustrated in my former patents and forms no part of the present invention.

I am aware that changes in the form, proportion, construction and arrangement of parts may be made without departing from the spirit and without sacrificing the advantages of the invention and I reserve the right to make all such changes as fairly fall within the scope of the following claims.

I claim:

1. In a machine for making printing plates, the combination of a normally rotating die head, dies movably mounted on the head, means for operating the dies and including a shuttle, means for stopping the die head, and means operated by the last named means for controlling the shuttle.

2. In a machine for making printing plates, the combination of a normally rotating die head, dies movably mounted on the head, means for operating the dies and including a shuttle, means for holding said shuttle in inoperative position, means forstopping the die head, and means operated by the last named means for releasing the shuttle.

3. In a machine for making printing plates, the combination of a normally rotating die head, dies movably mounted on the head, continually vibrating means for operating the dies, a shuttle for rendering the vibrating means effective, means for holding the shuttle in inoperative position, means for stopping the die head, and means operated by said stopping means for releasing said shuttle.

4. In a machine for making printing plates, the combination of a normally rotating die head, dies movably mounted on the head, means for operating the dies and including a shuttle, means for holding said shuttle in inoperative position, an arm rotating with said head, a stop adapted to be moved into the path of said arm, and means carried by said arm for controlling said shuttle. Y

5. In a machine for making printing plates, the combination of a normally rotating die head, dies movably mounted on the head, means for operating the dies and including a shuttle, means for holding the shuttle in inoperativeposition, a latch rotating with the die head, and means for causing the die head to stop and including a stop adapted to operate said latch to release said shuttle.

6. In a machine for making printing plates, the combination of a' normally 1'0- tating die head, dies movably mounted on the head, means for operating the dies and including a shuttle, means for holding said shuttle in inoperative position and including an arm rotating with the die head, a latch rotating with the arm, and a stop adapted to be moved into the path of said arm and latch to operate said latch and release said shuttle.

7. In a machine for making printing plates, the combination of a normally rotating die head, dies movably mounted on the head, means for operating the dies and including a shuttle, means for holding the shuttle in inoperative position and including a reciprocating rod, a latch rotating with said die head to limit the movement of said rod, means for simultaneously stopping the die head and. releasing the latch, and means for restoring the latch to operative position.

8. In a machine for making printing plates, the combination of a normally rotating die head, dies movably mounted on the head, keys and key bars corresponding to said dies, key operated means for stopping said die head, means for locking a key in operative position, means for operating the die when the head is stopped, and means operated by the last name means for releasing the key and the die head.

9. In a machine for making printing plates, the combination of a normally rotating die head, dies movably mounted on the head, key.operated means for stopping tating v thehead, stops for stopping the die head,

key bars for operating the stops, means for automatically looking a key bar in operated position and the remaining keys in normal position, means for operating the dies,,. and means operated by said last mentioned means for releasing the keys and the die head.

11. In a machine for making printing plates, the combination of a normally rotating die head, dies movably mounted on the head, a plurality of stops adapted to stop the die head, key bars for operating the stops, means for automatically looking a key bar in position to hold its stop 1n operated position, means for operating the dies, and means operated by the return stroke of the operating means for releasing theke bar.

12. n a machine for making printing plates, the combination of a normally rotating die head, dies movably mounted on the head, key operated means for stopping said die head, key bars for operating said stopping means, means for locking a key bar in operated osition, means for operating the dies an including a shuttle lever, and means operated by the shuttle'lever for releasing the key bar and restoring it to normal position.

13. In a machine for making printing plates, the combination of a normally rotating die head, dies movably mounted on the head, key operated means for stopping the die head, key bars for operating said stopping means, m'eans for looking a bar in operated position, means for operating the dies and including an arm, a release bar for releasing said bar, and means for connecting said release bar to said arm.

14. In a machine for making printing plates, the combination of a normally rotating die head dies movably mounted on the head, key operated means for stopping said die head, key bars for operating said means, a locking bar for locking said key bars, a release bar for releasing said looking bar, means for operating said dies, and

means for connecting said release bar with said d1e operating means.

for operating the dies and inc uding a" shuttle, means for normally holding the shuttle'in inoperative position, means for stopping the rotating head, means for re leasing the shuttle whenthe head is stopped, and means operated by the die operating means for releasing the die head.

16. In a machine for making printing 7 plates, the combination of a normally rotating die head, dies carried thereby, continuously operating but normally inefiective means for operating said dies, means for stopping the die head, means for rendering said continuously operating means effective on the dies when the head is'stopped, and

means for automatically Withdrawing the stopping means after the dies have operated. 17 In a machine for making printing plates, the combination of a normally rotat-- ing die head, dies carried thereby, continu-v ously operating means for operating said dies, means for stopping said head, and means operated by the die operating means for locking said head while the impression is being made.

18. In a machine for making printing plates, the combination of a normally rotating die head, dies movably mounted on said head, keys corresponding to said dies, an arm rotating with said die head, stops corresponding with said dies, means 0 erated by the respective keys for-moving t e said stops into the path of said arm, means for operating said dies and including a shuttle, means for locking the shuttle in inoperative position, and means rotating with said die head and adapted to be moved by engagement with a stop for releasing said shuttle.

19. In a machine for making rinting plates, the combination of a normaliy rotating die head, dies carried thereby, means for operating said dies and including a pivoted shuttle arm, means for stopping the head, a device for locking said head, and means connected with said arm for operating said device to lock the head during the impression operation.

20. In a machine for making printing plates, the combination of a normally rotating die head having a series of teeth, a locking block, an operating lever for moving 22. In a machine for making printing plates, the combination of a normally rotating die head having a plurality of teeth, a locking device adapted to engage said teeth, and means for operating said device comprising two levers pivotally mounted on the same pivot, one of said levers being engaged with said device, a pin on the other lever to engage said first mentioned lever, and a spring yieldingly connecting said levers.

23. In a machine for making printing plates, the combination of a plurality of key bars, a locking bar, means operated by depressing a key bar for locking said key bar in depressed position and the other key bars in normal position, and manually operated means for releasing said key bars and restoring the depressed key bar to normal position. 24. In a machine for making printing plates, the combination of a plurality of key bars, a locking bar for engaging and looking a key bar in depressed position and the other key bars in normal position,

means for restoring the depressed key bar to normal position when released, and manually controlled means for operating said locking bar and restorer.

25. In a machine for making printing plates, the combination of a plurality of key bars, a locking bar for engaging and looking a key bar in depressed position and the other key bars in normal position, means for restoring the depressed key bar to normal position when released, and manually controlled means comprising an arm for operating said locking bar to release the key bars and another arm for operating the restorer. I

JOSEPH S. DUNCAN.

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