US1008303A - Pattern or record-strip composing-machine. - Google Patents

Description

J. S. BANGROPT & M. G. INDAHL. PATTERN 0R RECORD STRIP GOMPOSING MACHINE.

APPLICATION FILED JULY 18, 1910. 1,008,303. Patented Nov. 14, 1911.

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COLUMBIA PLANOGRAPH co.. WASHINGTON. D. c.

J. S. BANGROPT & M. G. INDAHL. PATTERN 0R RECORD STRIP com'osme MACHINE. APPLICATION FILED JULY 18, 1910.

Patented Nov. 14, 1911.

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J. S. BANGROPT & M. G. INDAHL. PATTERN 0B. BEGORD STRIP GOMPOSING MACHINE. APPLICATION FILED JULY 18, 1910.

1,008,303. Patented Nov. 14, 1911.

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J. S. BANGROFT & M. G. INDAHL. PATTERN 011 RECORD STRIP GOMPOSING MACHINE.

APPLICATION FILED JULY 18, 1910. 1,008,303. Patented Nov. 14, 1911.

15 SHEETS-SHEET 4.

J. S. BANCROPT & M. 0. INDAHL. PATTERN 0R RECORD STRIP GOMPOSING MACHINE.

APPLICATION FILED JULY 18, 1910.

- Patented Nov. 14, 1911.

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J. S. BANGROFT & M. 0. INDAHL. PATTERN 0R RECORD STRIP GOMPOSING MACHINE.

APPLICATION FILED JULY 18, 1910. 1,008,303, Patented Nov. 14, 1911.

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COLUMBIA PLANOGRAFH co, WASHINGTON. n. c.

J. S. BANCROFT & M. G. INDAHL. PATTERN 0R RECORD STRIP comrosme MACHINE.

APPLICATION FILED JULY 18, 1910.

Patented Nov. 14, 1911.

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Patented Nov. 14, 1911.

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J. S. BANGROPT & M. G. INDAHL.

PATTERN OR RECORD STRIP GOMPOSING MACHINE. I

APPLICATION FILED JULY 1a, 1910.

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J. S. BANGROPT & M. G. INDAHL. PATTERN on RECORD STRIP GOMPOSING MACHINE.

APPLIOATION FILED JULY 18, 1910.

Patented Nov. 14,1911.

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J. S. BANGROFT & M. G. INDAHL. PATTERN on RECORD STRIP comrosme MACHINE. APPLICATION FILED JULY 18, 1910.

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J. s. BANGROPT & M. 0; INDAHL. PATTERN 0R RECORD STRIP GOMPOSING MACHINE. APPLICATION FAILED JULY 18, 1910.

1,008,303. Patented Nov. 14, 1911.

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JOHN SELLERS BANCROFT AND MAURITZ C. INDAHL, OF PHILADELPHIA, PENNSYL- VANIA, ASSIGNORS TO LANSTON MONOTYPE MACHINE COMPANY, OF PHILADEL- PHIA, PENNSYLVANIA, A CORPORATION OF VIRGINIA.

PATTERN OB- RECORD-STRIP COMPOSING-MACHINE.

Specification of Letters Patent.

Patented Nov. 14., 1911.

Application filed Jul 18,1910. Serial No. 572,526.

To all whom it may concern:

Be it known that we, JOHN SELLERS BAN: CROFT and MAURIT C. INDAHL, of Philadelphia, in the county of Philadelphia, State of Pennsylvania, have invented a certain new and useful Improvement in Pattern or Record-Strip Composing-Machines; and we do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, and to the figures and letters of reference marked thereon.

This invention relates to improvements in the class of keyboard perforating machines employed in the production of patterns or controllers for automatic type casting and composing machines and equipped with a perforating mechanism including a series of ke -controlled and power actuated punches, a feed mechanism for the pattern, and a units measuring and registering mechanism including a units-wheel coupled with the registering devices, a units-rack, a holding pawl, a series of stop or gage bars for the units-rack, and means for alternately engaging the units-rack and holding pawl with the units-wheel. Heretofore in machines of this class the units measuring mechanism has been provided with a motor coupled with the units wheel to impel the latter, the units rack operating as part of an escapement for admeasuring the advance of the units wheel, while the punches were either directly operated by pressure upon the keys, or through a separate motor or motors controlled by the keys.

In the prior machines referred to the pressure of the units-wheel-motor being continuous is, in the intervals between successive feed movements, received upon and borne by the escapement devices, thereby not only increasing thewear on the contacting surfaces but favoring accidental displacement of the interlocking members and racing on the part of the units-wheel.

One of the principal objects of the present invention is to produce an organized machine of the class mentioned wherein the units measuring mechanism, as well as the feeding and punching devices, receive their operating movements from a single motor device or driving shaft, the latter coupled with or receiving motion from any competent or approved form of motor or prime mover.

The invention also includes minor features of construction and combinations of parts pertaining to the organized mechanism, including, in particular, a repeat mechanism, and long line preventer, all as here inafter fully described, the novel features being specified in the appended claims.

In the accompanying drawings illustrating a preferred form of embodiment of the in'ventionFigure 1 is a front elevation of the machine with a portion of the keyboard cut away. Fig. 2 is a top elevation, also omitting portions of the keyboard. Fig. 3 is a left hand end elevation of Fig. 2. Fig. 4. is a perspective view, on an enlarged scale, of the units measuring mechanism. and connected parts. Fig. 5 is a bottom plan view and Fig. 6 is a rear elevation of the actuating mechanism for the punch bars, stop bars, clutch and units measuring devices. Fig. 7 is a vertical section on the line 0000, Fig. 6. Fig. 8 is a similar section on the line yy, Fig. 6. Fig. 9 is a longitudinal vertical section of the units measuring mechanism. Fig. 10 is a detail perspective of a portion of the units measuring mechanism. Fig. 11 is a perspective view of the one revolution clutch. Fig. 12 is a detail view of the clutch showing the parts thereof detached and separated. Fig. 13 is a detail view of the punch actuating cams and connections. Fig. 1 1 is a perspective view of a portion of the paper tower showing the feeding and tensioning winding mechanism for the record strip. Fig. 15 is a section through the punching devices showing the movable punch guide. Fig. 16 is a detail view of the connections between the punch-bar and stop-bar actuators and the selectors. Fig. 17 is a perspective view of the clutch controlling devices and their relation to the selectors and punch and stop-bar actuators. Fig. 18 is a perspective view of the clutch controlling latch and cooperating trips. Fig. 19 is a side elevation partly in section of the clutch controlling devices. Fig. 20 is a perspective view of the line-scale-rack supplemental gaging and indicating attachment. Fig. 21 is a perspective View of a portion of the repeat trip and cut out mechanism. Fig. 22 is a detail view of the connections between the linescalerack pick-up and the controlling devices of the repeat action, the cut out and the justification drum. Fig. 23 is a side elevation of the justification drum pointer actuating devices, and the movable pick up carriage, the latter shown in section. Fig. 24 is an enlarged perspective of the adjustable stop for the line-scale-rack. Fig. 25 is a perspective of the bell actuating mechanism. F ig. 26 is a diagrammatic perspective of the permutation keyboard mechanism.

Like letters of reference in the several fig ures indicate the same parts.

The several performing mechanisms, including the punches, units-bars, paper feed, bell and units-measuring and indicating devices derive motion from a driven shaft 1, mounted in bearings on the frame, and coupled through a one-revolution clutch, with a running motor or prime mover, represented in this instance by driving pulley 2. Pulley 2 is fast on a shaft 3, located at one end of and in alinement with shaft 1, to which it is connected through a one revolution clutch, of which that illustrated, by way of example, includes a sleeve 1 fast on shaft 3 and surrounding a hub 5 fast on shaft 1. Hub 5 is furnished with one or more, prefer ably four, inclined or cam faced seats 6, and between each of the latter and the inner face of sleeve 4 is disposed a gripping roller 7. Interposed between sleeve 1 and hub 5 is a collar 8 provided with longitudinal grooves 9 for the reception of rollers 7 and with a radial projection or arm 10. Collar 8 turns loosely upon hub 5 and is advanced thereon, in the direction of the motion of driving sleeve 41-, by a spring 11, one end whereof is connected to arm 10 and the other to an en largement of hub 5. Through the action of spring 11 rollers 7 are advanced upon their inclined seats to grip sleeve at and thereby transmit motion from. shaft 3 to shaft 1; but when arm 10 encounters an obstruction, such as the end of a bar 12 thrust into its path, collar 8 will be arrested and caused to retract rollers 7 relatively to their seats 6, thereby withdrawing them from gripping engagement with sleeve 1 and thus opening the clutch, which condition is maintained until by the withdrawal of bar 12, spring 11 is again permitted to exert its closing pressure.

The punches are driven from an eccentric 13 fast on shaft 1, as follows: The punches 1 1 are supported against lateral displacement by a guide bar 15 in close proximity to the die bar 16 on head 17. Guide bar 15 is supported in guides on the paper-tower 18, to move longitudinally of the punches toward and from die bar 16, and it is engaged by a lever 19 to which is connected a spring 20, the latter tending to advance said guide bar 15 toward die bar 16 and hold the same against a limiting abutment, to provide a narrow opening for the passage of the paper strip or ribbon. To facilitate the insertion of the paper a. lever 21 fast on shaft 21*, the latter supported in bearings on the paper tower, is connected by a link 22 with lever 19, the arrangement being such that when lever 21 is in one extreme position, as indicated by full lines in Fig. 15, spring 20 will be free to advance the guide bar, and when said lever is moved to the opposite extreme position, as indicated by dotted lines, the guide bar will be retracted and so held by the passing of the connecting end of link 22 to the opposite side of the fulcrum of lever 19, a stop being provided. for arresting shaft 21* as will presently appear. Each punch is detachably secured to one of a series of punch-bars 24 the latter supported in guides on the frame, and to each punch bar is pivotally attached an interponent- 25 provided with an engaging shoulder 26 adapted to be moved over or into engagement with an actuator, the latter in the form of a cross bar 27 supported to reciprocate longitudinally of the punch bars in guides on the frame. To the punch actuator 27 is secured an inverted T, 28, the stem whereof is pivotally connected to one arm of a lever 29, the other arm whereof is pivotally attached to a pitman 30 carrying a strap surrounding eccentric 13. Each revolution of shaft 1 will pro duce a complete reciprocation of actuator 27 and of those punch bars whose interponents 25 have previously been projected into its path. The paper feed mechanism is also driven from eccentric 13. This mechanism includes a V toothed wheel 31, fast on the pin-wheel shaft; an annulus 32 movable in bearings concentric with the axis of the pinwheel shaft and carrying a driving pawl 33 engaging wheel 31 and a lug 3 1 movable between stops 35; a holding pawl 36 pivoted on the frame; a link 37 connected to pawl 33; a lever 38 pivoted to link 37 and pawl 36; a spring 39 connecting the operating ends of pawls 33 and 36; and an actuating lever 10 coupled with lever 38 through a link 4-1. The arrangement is such that when lever 1O is at the upper extremity of its movement, as illustrated in Fig. 14, annulus 32 will be arrested by the forward stop 35 and pawl 33 held in engagement and pawl 36 out of engagement with wheel 31 by the tilting of lever 38 on link 37, thereby increasing the tension of spring 39. If, now, lever 40 is retracted, to tilt lever 38, the reaction of spring 39 will effect the engagement of holding pawl 36 prior to the withdrawal of actuating pawl 33, and thereafter during the continued downward movement of lever 10, to retract annulus 32 and its driving pawl 33, lever 38 will fulcrum upon the holding pawl and insure the engagement of the latter with wheel 31. Vhen the motion of lever 40 is reversed, driving pawl 33 will engage wheel 31 before holding pawl 36 is withdrawn, and during the return or upward movement of said lever 40 the feed movement will be communicated to the pin wheel shaft.

Actuating lever 40 is connected by a rod 42 to a head 43, the latter fast on a rod 44 supported to reciprocate longitudinally in bearings on the frame, and said head 43 is in turn connected with the punch operating pitman 30 through a compression coupling formed, in this instance, by a sleeve 45 pivotally attached at one end to pitman 30, a rod 46 pivotally attached at one end to head 43, and a spring 47 interposed between collars 48, the latter movable upon rod 46 between shoulders 48. Opposite ends of sleeve 45 engage collars 48 so that the movement of said sleeve in either direction will be transmitted to rod 46 through spring 47, to compensate for an excess of movement of pitman 30 over that permitted lever 40 by the engagement of annulus 32 with stops 35, and to prevent breakage if from any cause the movement of lever 40 is prevented. Through actuating lever 40 eccentric 13 is also caused to operate the receiving spool 50 of tne paper feeding mechanism, as will next appear. Pivoted upon the shaft of ratchet wheel 51, to which the winding spool is coupled in the usual manner, are two levers 52, 53, the first carrying pawl 54 and the second pawl 55, each held in engagement with said ratchet wheel by a spring 56. A bar 57 is connected to lever 52 on one side the axis of wheel 51, and a similar bar 58 is connected to lever 53 on the opposite side of said axis, the arrangement being such that bars 57, 58, move in opposite directions in effecting the forward or feeding movements of their respective pawls 54, The lower ends of bars 57, 58, are slotted to receive a pin 59 carried by an arm or extension 60 of the feed actuating lever 40, and a motor spring 61 is connected at opposite ends to said bars 57, 58, respectively.

The arrangement is such that as actuating lever 40 is depressed to retract driving pawl 33 preliminary to the feeding movement, pin 59 will engage bar 57 to retract pawl 54; and upon the reverse or feeding movement of said actuating lever bar 58 will be moved to retract its pawl 55. Thus, during each complete reciprocation of the feed actuating lever 40, pawls 54, 55, will be successively retracted, and as the bars 57, 58, to which said pawls are connected are coupled to opposite ends of the same motor spring and are arranged to move in relatively opposite directions during the feeding movements of their respective pawls, a constant and more nearly uniform degree of tension can be maintained upon the strip than where a single spring actuated pawl is employed for the purpose, inasmuch as the power of the spring is restored during the winding motion and the tension is maintained on the strip by the action of one or the other pawl while such restoration of power is being effected, consequently there is no relaxation of the tension incident to the restoring action.

it is desirable that the winding spool should be disconnected from its tensioning and impelling devices, and the pin wheels released from their feeding devices when a new strip is being applied, and as this coincides in point of time with the more frequent occasions for the withdrawal of guide bar 15, provision is made whereby the turning of shaft 21* to retract said guide bar will automatically throw pawls 54, 55, out

-of engagement with ratchet wheel 51, and

driving pawl 33 out of engagement with toothed wheel 31, so that the pin wheel shaft and winding spool can each be freely turned by hand and in either direction. lVith these ends in view, a lever 63 is so pivoted on the side of the paper tower that one arm stands opposite a shoulder 64 on bar 57 with the opposite arm opposite a bearing on an extension of link 37. Bar 57 is provided with an engaging shoulder 65 opposite the tail of pawl 55 and an extension 66 opposite the tail of pawl 54, and the several members are so proportioned and arranged that when lever 63 is tilted from its normal position, Fig. 14, it will, through its engagement with link 37, tilt pawl 33, to withdraw its engaging end from wheel 31, and, through its engagement with shoulder 64, advance bar 57 until shoulder 65 and extension 66 contact with and Withdraw pawls 54, 55, from ratchet wheel 51. Lever 63 is coupled to a crank arm 67 011 shaft 21* through a link 68. When shaft 21* is turned to retract guide bar 15 and pawls 33, 54 and 55, the pressure of spring 20 on shaft 21* is shifted from a point below to a point above the axis of said shaft, thereby tending to rotate the latter in the reverse direction, and by arranging a stop 69 on the frame in the path of crank arm 67, spring 20 Fig. 15 is utilized forretaining said guide bar and pawls both in the active and inactive positions to which they are carried by the rotation of shaft 21*.

The units measuring and indicating mechanism includes the usual units wheel 75, holding pawl 76, units-rack 77, series of stop-bars 78 for admeasuring the excursions of the units-rack when in engagement with the units-wheel, justification-drum 79, pointer 80, line-scale 81, and line-scale-rack 82, the latter connected to the units wheel through shaft 83 and pinion 84; but the actuating devices, more especially those controlling the units rack, holdingpawl and stop-bars, have been materially changed and modified to accommodate said mechanism to the single motor drive system of the present invention, as will presently appear.

The stopbars are disposed side by side in sequence between the side bars of the stopbar-frame 85, and are normally suspended upon a cross bar 86. Each stop bar is provided with a dependent arm or stem 87 provided with an off-set 88 adapted, when said stem is swung rearwardly, to be engaged by an actuator 89, the latter guided on the frame to reciprocate longitudinally of said stems.

To the stopdun-actuator 89 is pivotally connected an arm 90 secured to a head 91, fulcrumed at 92 on bearings on the frame and carrying a furcated arm 98 straddling shaft 1, the branches of said arm 93 being spread laterally, the one engaging cam 94: and the other cam 95, both fast on shaft 1. Thus, at each complete revolution of shaft 1, actuator 89, together with such of the stop-bars as are at the time engaged therewith, will be compelled to make a complete reciprocation.

The imits-rack 77 is supported to reciprocate longitudinally in guides in the unitsrack-carrier 96, the latter pivoted at one end upon fulcrum 92 while its opposite end is free to vibrate between adjustable stops 9?, to alternately engage the units rack with the units-wheel, and to withdraw the same therefrom. The holding pawl 76 is movable radially of the units-wheel and is connected to the units-rack-carrier 96 through hellcrank lever 98, link 99, and lever 100, the latter pivot-ally supported upon one end of lever 101 whose opposite end carries a roller engaging a cam 102 on shaft 1. To lever 100, at a point intermediate link 99 and the fulcrum of said lever on lever 101, is connected a spring 103, the latter exerting pressure in a direction to advance both the units-rack-carrier and the holding pawl toward the units-wheel, thereby insuring the seating of one of said members before the other can be withdrawn from the unitswheel. Units-rack 77 is provided with a lug 1014-, for engaging the stop-bars, when the latter are projected into its path, and with two bearings 105 between which is received the end of the actuating lever 106, the latter pivotally supported upon the frame, as at 107.

Supported to reciprocate transversely of shaft 1, as upon a pin 108 fast at one end upon the frame, is a slide 109 to which is pivoted one end of a lever 110 carrying a roller 111 in position to engage the periph cry of a cam 112 fast on shaft 1, while the opposite end of said lever is connected by a link 1113 to unitsrack-actuating-lever 106 at a point intermediate its fulcrum and the units-rack, and to said lever 110, at a point intermediate roller 111 and slide 109, is connected at retracting spring llt. The arrangement is such that when shaft 1 is at rest the low point of cam 11.2 will be presented to roller 111, and the reaction of spring 1141 will hold slide 109 against its bearing 115, thereby causing units-rack 77 to be retracted and held against its gaging abutment 116 on the units-rack-carrier. When, however, shaft 1 is revolved, and cam 112 is thereby caused to displace lever 110, the resistance of spring 11 1 being greater than that of the units-rack, lever 110 will be tilted upon its fulcrum on slide 109 without causing displacement of the latter, and units-rack 77 will be advanced until it encounters a projected stop-bar, whereupon said units-rack will be arrested, and the resistance being thereby in creased above the capacity of spring 111, the latter will yield, permitting slide 109 to move away from its bearing 115.

The timing is such that the advance or operating stroke of the units-rack takes place after the withdrawal of the holding pawl and the engagement of the units-rack with the units-wheel, while the return stroke of said units-rack occurs only after the holding pawl has been engaged and the units-rack withdrawn, hence the admeasuring movement derived from. cam 112 and transmitted to the units-wheel and connected mechanism is measured by that one of the stopbars at the time projected into the path of said units-rack, and no pressure is exerted upon the units wheel, to turn the latter, save during this feeding movement.

It is next in order to explain the means for uniting the several mechanisi'ns hereinbefore described into an organized machine competent to produce the desired series of signals and at the same time register the unit values thereof. This includes the means for selectively engaging the punches and stop-bars with their respective actuators, for controlling thhe clutch intermediate the prime mover and the driving or cam shaft 1 from which the said actuators as well as the units-registering mechanism derive their movements, and for returning the units-measuring mechanism to starting position at the beginning of each line of composition.

Each of the punch bar interponents 25 is connected by a link 120 to one of a series of selectors 121, and each stop-bar stem 87 is in like manner connected by a link 122 to one of a series of selectors 123. Selectors 121 are pivotally supported from their lower ends upon a rod 124:, and selectors 123 are in like manner supported from their upper ends upon a rod 125, said rods being in turn mounted in a frame 126 detachably secured to the main frame.

Supported upon rod 124 and arranged in series with selectors 121 are two additional selectors 127, 128, the former provided with an offset or arm 129 and the latter provided with a bar 129 extending across the ends of selectors 121 and supported at its opposite end upon said rod 124. Each of the selectors 121, 127 and 128, is furnished with a retracting spring 130, while selectors 123, together with the units-bar stems are returned by gravity aided by bar 129*.

Clutch-opening bar 12, movable longitudinally in guides on the frame, is pro vided with a retracting spring 131, and rests upon a lever 132, pivoted to the frame at 133. The inner or free end of lever 132 projects above punchactuator 27 and is provided with an adjustable bearing 134 for engaging said punch-actuator when the latter is elevated to advance the punches. Said lever 132 is also provided with a bearing 135 adapted to engage and be upheld by a movable support in the form of a latch 136 pivoted to swing into and out of the path of said bearing. To selector 128 is pivoted one end of a trip 137, the latter provided with a shoulder 138 against which latch 136 is held by a retracting spring 139 in position to receive and support bearing 135 of clutch-opening bar 12, and with an extension 140 overlying punch-actuator 27. The arrangement is such that when the machine is at rest, 2 6., with clutch opening bar 12 advanced into the path of and engaged by arm 10 of the clutch, latch 136 will stand beneath bearing 135 to uphold lever 132, said latch resting against shoulder 138 on trip 137. If, now, selector 128 is advanced its trip 137 will engage with and withdraw latch 135 from beneath lever 132 and the latter will drop until arrested by contact with punch-actuator 27, whereupon bar 12 will be withdrawn from contact with arm 10 and the clutch permitted to close. As punch actuator 27 is elevated it will raise lever 132 and trip.137 until bar 12 is again projected into the path of clutcharm 10 and shoulder 138 is elevated above latch 136, which latter immediately returns to initial position ready'to receive and uphold lever 132 as the punch-actuator descends, and to be rengaged by trip 137 when actuator 128 is retracted. Thus a single revolution of shaft 1 will take place at each forward movement of selector 128, not to be repeated until said selector shall have first been retracted to rengage latch 136.

To selector 127 is pivoted a trip 141 provided with a latch-engaging shoulder 142 similar to that on trip 137 but shorter. The purpose of this trip is to withdraw latch 136 and hold it out of the path of lever 132 so long as pressure is maintained upon selector 127, so that the shaft 1 may continue in motion for more than one revolution, to the end that a designated signal may be repeated a number of times, as when quadding out a line.

It may here be noted that each punch-bar interponent 25 as Well as each stop-bar stem 87 is provided with a notch 143, and above the series of interponents 25 is arranged a looking or retaining bar 144, and above the notched portions of the stop-bar stems is arranged a similar retaining bar 145. Bars 144 and 145 are pivotally supported to move longitudinally of the punch bars, the upper bar 145 resting upon the supporting arms 146 of the lower bar 144, and the latter provided with an arm 144* resting upon lever 132. When lever 132 is supported 'upon latch 136 locking bars 144 and 145 will be sustained at such distance above their respective actuators as, to afford a clear opening for the passage of the interponents and stop-bar stems. When, however, latch 136 is withdrawn from under lever 132 and the latter is permitted to descend until arrested by punch bar actuator 25, looking bars 144, 145, will be deposited in the notches of such of the interponents and stop-bar stems as shall have been advanced above their respective actuators to lock and hold the same in engagement until latch 136 is again interposed in the path of lever 132, to arrest the latter during the descent of actuator 25.

The punch bar, clutch and stop-bar selectors 121, 127, 128 and 123, are controlled through the medium of a suitable keyboard mechanism, preferably of the type illustrated, wherein through the intervention of permutating means any key may be placed in control of any one or more ofthe selectors, as will presently appear.

The keyboard mechanism shown includes a series of key levers 151 preferably separated laterally into two groups; a series of push bars 152, one for each key lever and provided with a. lug 153 for engagement thereby; a series of push bars 154 arranged parallel and in the same plane with push bars 152; a special push bar 155 associated with the series 152; a third series of push bars 156, 156", in parallel with but in a plane below series 152; and a series of transmitting bars 157 intermediate the series of push bars 154 and push bars 152 and 153 and extending transversely thereof.

The forward end of each push-bar 156 registers with one of the selectors 121, while push bar 156 registers with selectors 128, and each of said push bars 156 is furnished with a shoulder 158 in position to be engaged by a different one of the series of transmitters 157, the latter pivotally sup ported upon rods 159 extending transversely of the push-bars, while push bar 156 is furnished with a series of such shoulders 158, one for each transmitter 157.

At opposite ends of the series of push-

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