US1204214A

US1204214A - Signal-recorder.

Info

Publication number: US1204214A
Authority: US
Inventors: Lee J Voorhees
Original assignee: GAMEWELL FIRE ALARM TELEGRAPH
Current assignee: GAMEWELL FIRE ALARM TELEGRAPH Co; GAMEWELL FIRE ALARM TELEGRAPH
Priority date: 1914-06-03
Filing date: 1914-06-03
Publication date: 1916-11-07
Anticipated expiration: 1933-11-07

Description

L. J. VOORHEES.

SIGNAL RECORDER.

APPLICATION FlLED JUNE 3,1914.

Patented Nov. 7

wwm.

3 SHEETSSHEET I.

INVENTOH M ATTORNEY L. J. VOORHEES.

SIGNAL RECORDER.

APPLICATION FILED JUNE 3.1914

1 ,2U42 1 Q. Patented Nov. 7, 1916.

SHEETSSHEET 2.

IN l/E/VTOR z 4 WITNESSES:

L. J. 'VOORHEES SIGNAL RECORDER.

APPLICATION FILED JUNE 3.1914.

Patented Nov. 7', 1916.

3 $HEETSSHEET 3 WITNESSES:

rromvy a are LEE J. VOORHEES, OF BINGHAMTON, NEW,YORK-, ASSIGNOR, BY MESN E ASSIGNMENTS, TO THE GAMEWELL FIRE ALARM TELEGRAPH COMPANY, A CORPORATION OF NEW YORK.

SIGNAL-REG ORDER.

To all whom it may concern:

Be it known that 15, LEE J. VOORHEES, a citizen of the United States, residing at -Binghamton, in the county of 'Broome, and

State of New York, have invented a new and useful Signal-Recorder, of which the following is a specification.

My improvement relates to electro-mag netically controlled signal recorders and is particularly adapted for recording fire alarm, police and other similar signals on a paper tape."

The objects of my invention are to provide a signal recorder positive in action, requiring minimum operative energy, permanent in adjustment and capable of economical manufacture, and'such other objects as are hereinafter specified and more particularly pointed out in the claims.

In constructing my invention, I provide an electro-magnetic escapement mechanism, a normally wound spring driven punching train and a propelling train actuated by the same motor spring, the cooperating parts of the escapement mechanism and punching train being so arranged that the structure carried by the armature shaft will merely guide a detent bar, and thus not be subjected to the blow incident to stopping the mechanism, which bar, in turn, is mounted upon a separate shaft or pivot and is provided with ledges and is hereinafter referred to as a ledge bar; the end of this bar being forked or slotted so as to permit relative adjustment of the ledges after they have been suitably hardened and to facilitate economical manufacture; a ledge arm being mounted upon a shaft of the punching train and flexibly connected therewith, such arm being adapted to engage with either of. the ledges carried by the ledge bar, the flexible connection between this revoluble ledge arm and the ledge bar consisting of a spring of such tension that the blow occasioned by the sud den stopping of the punching train will be cushioned by said spring and a ratchet disk and pawl being provided so as to prevent undue rebound of the punching train as a result of this cushioned stop.

The propelling train "is provided with suitable rollers for propelling the material to be punched and with a detent arm engaging with a toothed disk carried by a rela- Specification. of Letters Patent. Patented Nov, "Z, 1916,

Application filed June 3, 1914. 1 Serial No. 842,690.

controlled by an actuating plate frictionally connected with a relatively slow moving shaft of said train. Said detent arm and plate are connected by a link permitting some lost motion between them, a spring being so applied to the detent arm that when said arm is in position to engage the toothed disk said spring will tend to hold said arm in engagement. therewith, but when said arm is moved a certain distance away from the toothed disk, said spring will not tend to return the arm into engagement with the toothed disk, the lost motion in the connection between the arm and the actuating plate being such that when the plate has moved the arm toward the toothed disk to a point where the spring commences to act to swing the arm into engagementlwith the toothed disk, said arm will be permitted to instantaneously move into engagement with said toothed disk without further movement of the plate, and the direction of rotation of the shaft with which said plateis frictionally connected being such as to move said plate in the direction which will tend to move the detent arm into engagement with the toothed disk. The shaft of the punching train which carries the revoluble ledge arm is also provided with a pair of cams adapted to suitably influence a roller which is connected by a suitable arm with the frictionally driven detent actuating plate and this shaft also drives a crank pin which is connected by a suitable link with a punch bar so mounted as to be adapted to punch the material to be perforated; said cams and crank pin being so located with relation to each other and to the revoluble ledge arm that when said revoluble ledge arm is held by engagement with either of the ledges carried by the ledge bar, the crank pin will hold the punch bar out of the path of the material to be perforated, and neither of the cams will be in the path of theirco-engaging roller: but when the punching train is permitted to act, by the disengagement of the ledge bar from the revoluble ledge arm, one of the cams will be carried across the path of the roller in such relation thereto that if the detent arm is at the time of such release out of engagement with its cooperating toothed disk, the action of this cam on the roller will result in so moving the actuating plate as to cause the detent arm to engage the toothed disk, and the further movement of the punching train will cause the crank pin acting through its connecting link to drive the f punch 'bar through the material to be perfora-ted and positively withdraw said bar from said material, whereupon the further movement of the punching train will bring the second cam into engagement with the roller and thereby through the actuating plate withdraw the detent arm from the toothed disk and move said plate to a point with relation to the shaft of the propelling train with which it is frictionally connected from which it will only be moved to cause reengagement of the detent arm with the ing part of this specification, Figure 1 is a toothed disk after such shaft has revolved a predetermined distance.

In the drawings accompanying and formside elevation of the gear trains and controlling mechanism, with side plates re-' moved. Fig. 2 is an enlarged view of the propelling train detent. Fig. 3 shows the punching and propelling mechanism, with the cover of the punching case removed.

Fig. 4 is an enlarged view of the punching train ledge arm and restraining arm. Fig. 5 is an enlarged view of the ratchet mounted on the ledge arm shaft and its c'o-acting pawl. Fig. 6 is a sectional View of the motor spring taken on the line X X of Fig.

1. Fig. 7 is a side elevation of the recorder. Fig. 8 is an enlarged sectional view of the punching mechanism'shown in' Fig. 3, taken on the line Y Y. Fig. 9 is an enlarged view of the ledge arm shaft for the punching train shown in Fig. 1, and associated struc- "is pivoted at 5 and carries the pin 6 near the free, end of the other arm thereof, which pin 6 is adapted to engage with the ledge bar 7 which is pivoted at 8 and provided with a slot 9 at its free end adapted to receive the pm 6.

2 j The ledges 10 and 11 are formed on oneside of the bar 7 and on opposite sides of the slot 9. adjacent to the point where'said slot is engaged bypin 6 and at different distances from the pivot 8.- The faces of the ledges 10 and 11 nearest to the pivot 8 are substantially at right angles with the slot 9 and extend substantially to the edges of said slot. The face-of the ledge 11 nearest to the ledge- 10 is cut away for a purpose Well 1111- ment of said ledges without grinding them and thereby impairing or cutting through the casehardened surface. Thus, if warping of the part incidental to hardening results in unduly separating these ledges or distorts their relative position, they may be squeezed together, or twisted with relation to each other, while without this slot, a part so warped would be-useless. The slot 9 fur ther facilitates manufacture inproviding a cutting clearance for tools employed in forming the ledges and also furnishes convenient means of accurately obtaining desired relation between armature and ledges as the pin 6 may bereadily placed in fixed relation to the armature and being arranged to work in the slot 9 adjacent to said ledges assures a fixed relation between the armature and ledges in spite of any warping of the bar 7 .incidental to hardening.

The ledges 10 and 11 should be hardened so that their operating faces will not become battered or distorted due to the pounding upon them incident to the. operation of the mechanism, but it is preferable that the ledge bar should not be hardened throughout its entire length, but the hardening should be confined to the ledges and their immediate vicinity or the temper should be drawn from the portion of the' bar surrounding the end of the slot-'9 nearest the pivot 8 so that the two prongs of the fork formed by slotting the free-end of said bar will be adapted to relative adjustment by bending.

The punching train comprises the ledge arm shaft 12 driven by the pinion 13 and having thereon.

\ The ledge 15 (see also 4) projects from orieside of the ledge arm 14 in such position that it is adapted to be engaged by either of the ledges '10, 11. A lug 16 proj ects from the opposite side of the ledge arm 14 and is adapted to be engaged by an arm carried by the shaft 12 for causing the rota-. tion of said arm 14 with the shaft 12.

The restraining arm 17 is fixed upon the shaft 12 in such position that the sides of the notch 19 formed in said arm lie in the path of lug 16 and thereby limit the rotation of the arm 14 with relation to the shaft 12. I

, A spring 18 so connects the arms 14 and the ledge arm 14 loosely mounted 17 as tend to move the arm 14 as far as the notch 19 will permit it to rotate with relation to the shaft 12 in the directi on in which the shaft 12 normally revolves. This spring should be of such strength and tension that when the shaft 12 has made a complete revolution and thereby brought the ledge 15 against either the ledge 10 or the ledge 11, said spring 18, while permitting the continued motion of the shaft-l2 and parts moving therewith after the rotation of the ledge arm 14 has been arrested, will absorb the momentum of said shaft and moving parts within the distance which the notch 19 will permit said shaft 12 to revolve after the rotation of arm 14 has been arrested, and thus cushion the stopping of said punching train. The ratchet dish 20 (see also Fig. 5) is fixed upon the shaft 12 and the pawl 21 is mounted in suitable relation to said disk 20 and is provided with the spring 22 which is adapted to hold the free end of said pawl 21 in the path of the abutment 23 of the ratchet disk 20.

The disk 20 is so positioned upon the shaft 12, with relation to the restraining arm 17, that when said shaft 12 is rotating in its normal counter-clockwise direction, the abutment 23 will pass beyond the free end of the pawl 21 just before the ledge arm 14 reaches a point in its rotation where its movement will be arrested if the ledge 11 lies in its path. The purpose of the ratchet disk 20 and its coacting pawl 21 is to stop the movement of the shaft 12 and parts moving therewith, due to the recoil of spring 18 after said spring has been stretched in cushioning the blow incident to suddenly stopping the rotation of the shaft 12, within a limit which will be hereinafter more fully explained. The

cams

24 and 25 are fixed upon the shaft 12 and are adapted to suitably influence the roller 26 for the purpose of controlling the operation of the propelling train, as will be hereinafter more fully pointed out in describing the construction and arrangement of said propelling train.

The crank pin 27, punch bar 28 and link 29 are inclosed by the case 30 and cover 31 (see Figs. 3 and 8). The punch bar 28 is provided at one end with a cutting face adapted to punch the material to be perforated, which is shown as a paper tape 32 and the other end of said punch bar is slotted to receive the link 29 and is provided with a hole at right angles to the slot for receiving the pin 33 by means of which said link 29 is pivotally connected to said punch bar 29.

For convenience and economy in manufacture, the crank pin 27 is permanently fastened in the enlarged end 34 of the shaft 12 and is arranged to operate in a hole provided therefor in one end of, link 29. The

&

spring 35 is attached to the link 29 by means of the screw 36 and the free end of said spring is arranged to bear upon the enlarged head of the pin 33 and thereby hold said pin in position in the punch bar 28. The punch bar 28 is mounted in suitable openings in the case 30 so that said case forms a guide through which said punch bar may freely slide, and the opening 37 in the case 30 is provided in suitable relation to the punch bar 28 so as to guide the tape 32 in. the path of said punch bar.

The die 38 is provided with a large end or flange 39 and fitted to an opening in the case 30 which is provided in the line of motion of the punch bar 28, a suitable shoulder being pro ided in said opening so that one end of the die 38 maybe brought flush with the lower face of the opening 37, While preventing said die being moved far enough toward the punch bar 28 so that its end will project into said opening 37. A dovetailed piece 40 is fitted into a suitable slot in the bottom of the case 30 and is arranged to hold the flange 39 of the die 38 against the shoulder provided therefor in the case 30. An opening is provided in the die 38 in the path of the punch bar 28 and suitably fitted to the cutting end of said bar, and the lower part of the die 38 is recessed to a diameter substantially larger than that of the punch bar 28 to a point beyond that to which the end of said punch bar 28 will be depressed upon the rotation of the shaft 12 so that the disks detached from the tape 32 may fall freely through said recess after they have been forced through the cutting portion of the die by the action of the punch bar 28. An opening in line with the recess in the die 38 is provided in dovetailed piece 40, said opening being at least as large as said recess so that the disks will pass freely-through said dovetailed piece 40.

The cover 31 is attached to the case 30 for the purpose of protecting the crank pin,-

punch and link from dust and from mechanical injury and at the same time guiding the tape in suitable relation to the punch bar 28.

It will be noted that the cutting end of the punch bart28 is normally held slightly above the top of the opening 37 so that the punch will always be positively disengaged from the tape, and the cooperation of the ratchet disk 20 with the pawl 21 prevents the shaft 12 from backing up enough, as a result of the rebound due to the cushioning effect of the spring 18, to bring the punch bar 28 against the tape 32.

The pinion 13 is connected by suitable intel-mediate gearing with the main punching gear 41 which is loosely mounted upon the main shaft 42.

In the interests of clearness, the various gears and pinions are merely indicated by dotted pitch lines.

The main spring 46 is attached at one end to the main shaft 42 and at the other end to the main punching gear 41. The main prothe gear 47, as more particularly described in Patent No. 726,882 to H. W. Doughty and C. E. Beach dated May 5, 1903.

. The gear 47 is arranged to drive the shafts 48 and 49 by means of suitable intermediate gearing. The shaft 49 carries escapement wheel 50 which is adapted to engage with and operate the pallet 51 carried by the pallet shaft 52. The propelling roller 53 is also carried by the shaft 49, said roller being of such diameter as to adapt it to propel the tape 32, said tape being held in contact with said propelling roller by the tension roller 54 carried by the adjustable tension roller spring 55. The block 56 is provided for supporting the spring 55, said block having a slot 57 formed .therein to act as a guide for the tape 32.

A suitable governor bar 58 (see Fig. 1) is carried by the shaft 52 having thereon governdr weights 59 for regulating the speed of vibration of the pallet 51. A toothed disk 60 is also carried by the shaft 52 and a detent arm 61 is pivoted in suitable relation to said 'disk so that the free end of this arm may be brought into engagement with the teeth of said disk.

The relation of the arm 61 to the teeth of the disk 60 is such that said arm may permit the disk to rotate in one direction but will act as a ratchet click and prevent its rotation in the opposite direction, and as the escapement shaft 52 oscillates rapidly it is evident that when the arm 61 moves to engage the teeth of said disk the engaging end of said arm may bound out of said teeth momentarily, but at the same time said disk completes its movement in one direction and is about to start u on its return movement, it is evident that t ere is an instant during which said shaft is at rest and at such instant the detent arm 61 may engage with the teeth of said disk and prevent the resumption of its oscillation. By the use of this form of escapement shaft detent, I am enabled to arrest the movement of the escapement shaft by an expenditure of very little energy in moving the detent arm, because I have arranged to lock the shaft at a time when it has, of its own accord, momentarily come to rest, and I thus am' enabled to employ a detent structure merely capable of holding the pallet shaft structure at rest when it has, in its ordinary operation, come to rest, instead of having to provide a structure not only capable of holding the shaft at rest but capable of absorbing the momentum of the governor and other parts moving with said shaft when they are in most rapid vibration.

A suitable spring 62 (see also Fig. 2 is so connected with the arm 61 that when said arm has been moved nearly into engagement and so that when said plate is not so moved it will be moved with-said shaft 48 with sufficient force to positively operate the detent arm 61 as hereinafter described.

A link 65 is provided for connecting the plate 63 with the detent arm'61, said link having a slot 66 at one end, of such length that Whenever the detent arm 61 has been moved by said link to such position that the spring 62 tends to swing. said arm 61 into engagement with the disk 60, said slot 66 will permit the arm 61 to move into engagement with the disk 60 without further motion of the plate 63. With this construction the action of the detent in finally movmg into engagement with the pallet shaft structure is always practically instantaneous, thereby avoiding the chattering and uncertain action heretofore experienced in similar detents, due to the very slight movement of I the detent controlling structure incident to each oscillation ofthe escapement structure and the consequent tendency of the escapement structure to drive back the detent opcrating structure through the rounding over of the engaging points and requiring a very strong driving means for forcing the detent into the path of the escapement shaft lstrucure.

An arm 67 pivoted at 68 is arranged to connect at one end with the plate 63 and at the other end with the roller 26, said arm being arranged to carry said roller in such position with relationto the

cams

24 and 25 that when said cams are in the position which they occupy when the ledge 15 is engaging either the ledge 10 or the ledge 11,

neither of said cams will lie within the path of the roller 26, but when said ledge 15 has been disengaged by the ledge 10, the counterclockwise movement of the shaft 12 will bring the cam 25 in the path of the roller 26, and if the plate 63 is not already in posltlon to cause engagement of the detent arm 61 with toothed disk 60, said cam 25 will act upon the roller 26 to cause the plate 61 to be moved to such position,'thereby assuring the stopping of the propelling train just after the commencement of the rotation of the shaft 12. The cam 25 will further be so formed as to insure the engagement of the detent arm 61 with the disk before the shaft 12 has revolved far enough to cause'the punch bar 28 to force the tape 32 against the die 38.

The cam 24 is so formed that in the normal rotation of the shaft 12, after said shaft has revolved far enough to force the cutting end of the punch bar 28 through the tape 32 and to withdraw said punch bar therefrom, the cam 24 will engage the roller 26 and thereby so move the plate 63 as to not only withdraw the detent arm 61 from engagement with the toothed disk 60, but in addition thereto, will move said plate 63 far enough with relation to the shaft 48 so that said shaft will have to travel a distance sufficient to cause a predetermined amount of tape to be propelled past the

rollers

53 and 54 before the detent arm 61 will be so moved by the link 65 that the spring 62 will carry said arm 61 into engagement with the teeth of disk 60, for reasons well understood by those skilled in this art.

The operation of this recorder is as follows :Assuming that the various parts are in the positions shown in the drawings, which is the position said parts will assume when they come to rest when the magnet is denergized, (the arrangement of the escapement mechanism ledges 10 and 11 being such as to particularly adapt them for use in connection with a normally closed circuit) :If the magnet 1 is connected to a suitable normally closed circuit, it is evident that the armature 3 will be moved to its attracted position and the ledge 11 will be withdrawn from the path of the ledge 15 and the shaft 12 will rotate slightly, bringing said ledge 15 into engagement with the ledge 10. If, now, a signal be transmitted in the circuit connected to magnet 1, each time such circuit is interrupted, the armature 3 will be moved away from the magnet 1 through the action of gravity (which may be supplemented by a retractile spring, which is not shown, to avoid complicating the drawing) thereby movingthe ledge 10 out of the path of the ledge 15 and leaving the shaft 12 free to rotate. The rotation of the shaft 12 will carry the cam 25 past the roller 26 and may slightly move the arm 67 around its pivot 68 in a direction which will swing the actuating plate 63 in the direction which tends to move the detent arm 61 into the path of the toothed disk 60, but said arm and disk being already in engagement, no movement of said arm 61 will result from the cam 25 being thus carried past the roller 26. The continued rotation of the shaft 12 will cause the crank pin 27 acting through the link 29 to drive the unch bar 28 through the tape 32 and into t-e die 38 to a point where the cutting end of the punch bar 28 will project into the recess in the underside of said die 38, thereby forcin the disk thus cut from the tape 32 complete y through said die and leaving said disk free to drop clear of said die.

It is evident that the shaft 12 will have made substantially half a revolution at the time when the punch bar 28 is forced to the extent of its travel into the die 38. The continued rotation of the shaft 12 past this point will therefore result in withdrawing the punch bar 28 from the die 38 and from the tape 32, and immediately after the punch bar 28 has been raised far enough to disengage it from the tape 32, the cam 24 will be brought into engagement with the roller 26 and thereby swing the arm 67 to a point which will turn the actuating plate 63 far enough to withdraw the detent arm 61 from engagement with the toothed disk 60, leaving said detent arm 61 in a position from which it may be moved by the rotation of the shaft 48 only after said shaft has rotated for, a predetermined time which should be substantially longer than the interval between any two strokes of any signal which it is desired to record. After the cam 24 has thus caused the roller 26 to pass out of the path of said cam, the movement of the shaft 12 will be arrested by the engagement ofthe ledge 15 with the ledge 11.

It is evident that if the circuit through the magnet 1 is immediately closed after any break which has caused the disengagement of the ledge 10 from the ledge 15, the ensuing rotation of the shaft 12 will continue until the ledge 15 again engages the ledge 10, as the ledge 11 would, under these circumstances, be moved out of the path of the ledge 15 before said ledge 15 was in position to engage therewith. It will also be seen that differing time intervals elapsing between succeeding breaks in the circuit during any signal will be represented by correspondingly differing distances between perforations in the tape. It will also be noted that whenever the ledge 15 is released by the ledge 10 at a time when the detent arm 61 is out of engagement with the toothed disk 60, the cam 25 will cause said detent arm to be brought into engagement with said disk and thereby arrest the

rollers

53 and 54, and the tape 32 propelled thereby, before the punch bar 28 has been moved to a position where saidv tape 32 will be pinched between the cutting end of said punch bar 28 and the die 38, thus not only causing the record produced on the tape 32 to emphasize pauses or silent intervals in the signal recorded but also guarding against the tape being torn or I caused to catch in the die due to its being propelled at the time the punch is being forced through it.

Having now fully described my invention,

what I claim and desire to secure by Letters Patent of the United States is 1. In a signal recorder having an electromagnetically controlled punching train, and a normally wound propelling train for material to be punched ;detent mechanism adapted to engage said propelling train, means frictionally moved by the propelling train to cause engagement of the detent with said train, and a connection whereby the running of the punching train will actuate the frictionally moved means to alternately cause engagement and disengagement of said detent. 4

2. In a signal recorder, electro-magnetic escapement mechanism, a normally wound punching train controlled thereby, a suitable propelling train for material to be perforated, detent mechanism for said propelling train, means whereby said detent mechanism may be operated by the propelling train, a cam carried by the punching train and adapted to render the detent effective at certain times independent of the action of the,

propelling train, and a second cam carried by the punchingtrain and adapted to render the detent ineffective at certain other times in spite of the action of the propelling train.

3. In a signal recorder having a punching e train comprising electromagnetic escapement mechanism for releasing it for a predetermined cycle of operation, and a normally wound propelling train for material to be punched ;controlling means adapted to be frictionally moved by the propelling train,

and operating means moved by the punching train and normally permitting the controlling means to be moved by the propelling train and adapted to cause said controlling means to move the detent to engaging positionduring each cycle of the punching train.

4. In a signal recorder, electro-magnetic escapement mechanism, a normally wound punching train controlled thereby, a suitable propelling train for'material to be perforated, a disk moving with a shaft of said propelling train, a detent .arm rotatably mounted in suitable relation to said disk and adapted to be moved to engage therewith, a spring so connected with the detent arm as to tend to move said arm into engagement with said disk at certain times and-so that when said detent arm is moved a predetermined distance away from the disk said spring will cease to tend to move said detent arm toward said disk, suitable actuating mechanism for said detent arm controlled by both the punching and propelling trains, and a connection between said actuating mechanism and the detent arm arranged to permit relative movement between them.

5. In a signal recorder having a punching train comprising electro-magnetic escapement mechanism for releasing it for a predetermined cycle, and a normally wound propelling train for material to be punched controlling means adapted to be frictionally moved by the propelling train, and operating means moved by the punching train and adapted to actuate said controlling means during each cycle of the punching train, first h to said second opening and having a punch opening therein which is substantially enlarged from the end farther from the punch bar to a point passed by the end of the punch bar in the operation thereof.

7. In a signal recorder, electro-magnetic escapement mechanism, a normally wound punching train controlled thereby and including a shaft upon which a member of the escapement mechanismis so mounted as to be capable of rotating independently thereof, a restraining arm carried by said shaft and arranged to suitably limit the rotation of said member with relation to said shaft, a suitable spring connecting said member and said restraining arm, a ratchet carried by said shaft, a pawl adapted to-engage with said ratchet and limit the rebound of said shaft when its rotation has been arrested by the engagement of the escapement mechanism. punch mechanism connected with said punching train, a normally wound propelling train arranged to propel material to be perforated, and detent mechanism for said propelling train controlled by said punching train.

8. In a signal recorder, electro-magnetic escapement mechanism comprising a magnet and its armature, a ledge bar moved by said armature and having a forked end, a revoluble ledge arm mounted adjacent to the ledge bar, two ledges, each carried by aprong of the forked end of said ledge bar and adapted to be successively engaged by the ledge arm to. arrest the rotation thereof, a normally wound punching train having a shaft upon which the ledge arm is mounted, punch mechanism connected with said punching train, a normally wound propelling train arranged to propel material to be perforated, and detent mechanism for said propelling train controlled by said punching train.

9. In an electro-magnetically controlled signal recorder, a suitably operatedpunch bar, a guide case for said punch bar having therein an opening for the material to be perforated and a second opening for receiving a suitable die, said die opening being smaller at the end nearer the punch bar than at the end farther therefrom, a die fitted to said die opening and having a punch opening which is substantially enlarged from the end farther from the punch bar to a point passed by the end of the punch bar in the operation thereof, and a dove-tailed plate fitted to said case for retaining said die in said die opening and having an opening at least as large as, and registering with, 15 the enlarged end of said punch opening.

In witness whereof, I have hereunto subscribed my name, this 29th day of May, A. D. I914.

LEE J. VOORHEES.

Witnesses:

W. KENDALL BROWN, J. E. MARSHALL.