US2252472A - Typographical composing and distributing machine - Google Patents

Description

Aug. 12, 1941. R. H. sco'r'r Emu. 2,252,472

TYPOGRAPHICAL COMPOSING AND DISTRIBUTING mourns Filed Dec. 14, 1939 s Sheets-Sheet 1 Aug. 12, 1941. R. H. SCOTT ETAL 2,252,472

, TYPOGRAPHICAL comrosznm AND DISTRIBUTING MACHINE Filed Dec. 14, 1939 5 Sheets-Sheet 2 -12, 941. R. .4. SCOTT HAL 2 252 472 I'YPOG'RAPHICAI. COMPOSING AND DISTRIBUTING MACHINE Filed Dec. 14, 1959 5 Sheets-Sheet a I Aug. 12, 1941.

R. H. scoTT 5 m. 2,252,472 TYPOGRAPHICAL COMPOSI-NG AND DISTRIBUTING MACHINE Fil'ed Dec. 14, 1939 5 Sheets-Sheet 4 //VVE/VT0R.( M. M

g- 2, 1941- R. H. scoTT ErAL 2,252,472

TYPOGRAPHICAL COMPOSING AND DISTRIBUTING MACHINE Filed Dec. 14, 1939 s sheets-sheet S I MMMMM 1 '"6/ 60, n I l m MEG/VET Patented Aug. 12, 1941 TYPOGRAPHICAL COMPOSING AND DISTRIBUTING MACHINE Richard Henry Scott, Enfield, and William Fairall Gorse and Arthur Staniland Hayward, Altrincham, England, assignors to Linotype and Machinery Limited, London, England, a limitedliability company of Great.Britain Application December 14, 1939, Serial No. 309,166 In Great Britain December 16, 1938 30 Claims.

This invention relates to typographical composing and distributing machines such as those known commercially under the registered trademark Linotype, and more particularly to machines embodying a plurality of superposed magazines which are adjustable to bring one ormore of the magazines into operative relationship with assembling and distributing mechanisms. The primary object of the invention is to provide an improved form of power operated mechanism for effecting the adjustments of the magazines.

A further object of the invention is to prevent operation of the mechanism for adjusting the magazines, when the presence of a matrix in the distributing or assembling mechanisms might cause damage to a matrix or to parts of the machine in the event of the magazines being moved.

With these and other ends in view the invention consists in a typographical composing machine of the kind referred to having power operated mechanism for effecting adjustments of the magazines wherein a mechanical relay is provided to ensure that such means do not operate while a matrix or matrices are in transit in the distributing mechanism or are at the entrances to the magazine. Preferably the mechanical relay is electrically controlled.

For effecting the adjustments of the magazines the invention contemplates the employment of power operated cam mechanism comprising two cams, one of which serves to unlock the magazines prior to adjustment and the other of which serves to move the magazines, when both cams are given a predetermined movement in response to a signal or impulse which brings the poweroperating means into action. In order to prevent actuation of the last-mentioned means while matrices are in transit in the distributing mechanism, th invention further contemplates the use of such matrices to interrupt the transmission or relay of the magazine-change signal or impulse to the poweroperating means.

One convenient form of magazine-changing means according to the invention comprises an electrically controlled mechanical relay including rotary cams which are actuated so as to receive a predetermined angular movement at each actu ation in response to the closing of a magazinechange switch. With this arrangement the closing of the magazine-change switch may first bring about the actuation of feelers in the distributor which, by their full movement when the distributor is clear, close a second circuit to release the mechanical relay, or the circuit closed by the magazine-change switch may have an alternative path through any matrices in the distributor to render inactive a relay switch which normally, i. e., in the absence of matrices in the distributor, closes a second circuit serving to release the mechanical relay, after actuating further safety devices if desired. The opening of the magazine-change switch is preferably effected automatically by the movement of a member of the magazine-changing mechanism.

The invention can be applied, for example, to a machine embodying a column of four superposed inclined magazines movable columnwise to bring adjacent pairs of magazines into operative relationship with two distributors and two assembler entrances, and one form of the invention is described with reference to such a machine in the accompanying drawings in which: a

Figures 1 and 1A show a part section through a composing machine of the type referred to illustrating the mechanical relay and electrical controlling means, Figure 1 showing the lower part and Figure 1A the upper part thereof;

Figure 2 is a detailed drawing showing the modification of the invention wherein the matrices are employed to control the mechanical relay,

Figure 3 is a diagram showing the electrical connections of Figure 1, and

Figure 4 shows another alternative arrangement for carrying out the electrical control of the mechanical relay.

In the following description the form of mechanical relay chosen for illustrative purposes includes a vertically reciprocable striker rod l located above a constantly vertically reciprocated horizontal bar 2 and normally held out of the path thereof by means of a trip lever 3 which is electro-magnetically controlled.

In this constructional form of the invention, the striker rod l contacts at its upper end with a rocker arm 4 carrying a pawl 5 engaging a ratchet wheel 6 mounted on a short horizontal shaft 1 extending beneath the magazines A. On the said shaft is a gear wheel 8 engaging with a second gear wheel 9 mounted on a second horizontal shaft Ill parallel with that carrying the ratchet wheel 6, on which are fixed a profile cam II and a race cam 12. The race cam I2 is engaged by a roller l3 carried by an arm l4 connected to lever and link mechanism l5 for moving the magazines, while the profile cam II is engaged by a roller E6 on an arm [1 connected to lever and link mechanism is for unlocking the magazines preparatory to movement thereof. The two cams are so arranged that an unlocking movement must be imparted to the lever and link mechanism before the magazine movement takes place. In the arrangement under review each actuation of the striker rod I moves the ratchet wheel 6 through 45 and the gears by which this movement is transmitted to the cam shaft I 3 are of 2 to 1 ratio, so that at each actuation the cam shaft It) has a movement of 90, the race cam I 2 being of such form that each 90 movement thereof will cause the magazine column A to move from a position in which the lower pair of magazines I9 is operative to a position in which the upper pair of magazines 2!! is operative, or vice versa. Obviously, however, the cam and gears may be designed to provide for any desired sequence and number of changes.

A magazine-change switch 2| mounted conveniently on the machine controls, preferably through circuits embodying safety devices as hereinafter mentioned, an electro-magnet 22 whichactuates the trip lever 3. An arm 23 extends from the magazine-change switch 2! into the path of a stud 24 on the link mechanism l3 which eifects the unlocking of themagazines, so that during the unlocking movement, the switch is returned to its normal off position.

In the form of safety device shown in Figures 1 and 1A for ensuring that the machine is in condition for magazine-change before the change mechanism is actuated, closing of the magazinechange switch 2! energizes an electro-magnet 25 which, througha series of levers and links 26 moves feelerbars 27, 27a, on each distributor inwards towards the path of matrices on the distributor bars 28, 28a. The linkage 26 pivots about the points 29, 30. Should there be any matrices on the distributor bars, the feeler bars are arrested until the matrices are clear. Further movement of the feeler bars 21, 21a, is then permitted and causes a push rod 3| to move another feeler bar 32 situated on the upper magazine entrance channel 33 adjacent to one of the magazines 20, and the full movement of this feeler bar 32 permitted in the event of the magazine entrance channel being clear of matrices, causes a relay (Figure 3) to energize the electromagnet 22 controlling the striker rod trip lever 3. In the arrangement shown in the drawings the switch 2! is operable by hand to eiTect the magazine change and bring the relay into operation. The switch may, however, be automatically actuated by mechanical or electrical means from any suitable part of the machine.

The details of the electrical connections employed in the construction of Figures 1 and 1A are shown in Figure 3 wherein the connection 34 leads from the magazine-change switch 2! to the electro-magnet 25 at reduced mains voltage. A similar connection to th main is shown at 35 and the connection to the magnet 22 at 31. 33 is a connection to earth. The arrangement is such that the continued movement of the linkage 23 under the attraction of the core 38 of the electromagnet 25 when the feeler bar 32 is free to move into the channel 33 operates connections within the magnet 25 to close the relay circuit energising the electro-magnet 22.

An alternative arrangement of safety devices (see Figure 2) comprises an electrical circuit connected to the distributor bars 33 in such a manner that the presence of matrices 40 on the distributor bars 39 closes a circuit though the matrix to an electro-magnet 4! which lifts a lever arm 42 away from the relay switch 43 so rendering the relay switch 43 inactive. When the last matrix has dropped 01f the distributor bars the electrical circuit from the distributor bars is broken, the electro-magnet fill de-energised and the lever arm 42 pulled by a spring into contact with the relay switch 43. The relay switch 43 causes a second electro-magnet 44 to be energised and through a series of levers and links 26 (as in Figure 1A) a push rod 45 is engaged to move a feeler bar 46 situated on the upper magazine en trance 4?, which acts in a manner similar to the corresponding bar of the previously described arrangement, to energise the electro-magnet 22 controlling the striker rod trip lever 3.

The machine frame is earthed at 43 and on operation of the switch 2| current is led to the electro-magnet All at reduced mains voltage along the conductor 49. The connection 53 also leads to the mains and comes into operation when the relay circuit 5! is closed to the electro-magnet 22. The operation of the electro-magnet 44 is similar to that of the electro-magnet 25 (Figure 3) already described. It is to be observed that the distributor bars 39 are insulated and the current passes through the distributor screws 52 to the matrices 4B.

In the embodiment shown in Figure 4, an electric circuit is connected to the distributor bars 39 in such a manner that the presence of matrices 40 on the distributor bars 33 closes a circuit from the switch 2! through the conductor 49, the resistance 58, the conductor 89, the distributor bars 39, the matrices 49, the distributor screws 52 and the machine frame to earth.

When the last matrix has dropped off the distributor bars, the circuit having no way through the conductor 63, passes through the electromagnet coil 5| to earth. This energises the electro-magnet 6i and causes the lever arm 62 to be lifted, so that by operation of a series of levers and links 26, the push rod 45 is engaged to actuate the feeler bar 46 which is situated on the upper magazine entrance 4?. A dash pot 63 is embodied in the electro-magnet 6!, which delays the action of the feeler bar 43 for such time as is necessary to enable the matrix 43 to pass through the entrance 4? and be housed in the magazine l9.

Should there be no interference with the feeler 46, the lever 62 makes contact with a charged fixed point 64 and causes the electro-magnet 22 to be energized and the mechanical relay to be brought into operation to adjust the magazines.

To ensure that no'interference can be caused by matrices hanging in the lower magazine entrance, this entrance which as usual is pivotally mounted at 53 is connected by means of links 54 to the magazine unlocking mechanism, so that the unlocking movement causes the magazine entrance to be swung away from the magazines. Similar provision may be made to prevent interference by matrices at the front of the magazines by connecting a pivotal section of the assembler entrance 55 to the unlocking mechanism.

For example, in the known assembler entrance construction wherein a lower assembler entrance section is adjustable to connect either with the lower magazine or with an upper assembler entrance section, which latter is itself pivotally movable out of the operative position, the pivoted upper assembler entrance section 55 may be connected to the magazine unlocking mechanism so that it is swung away from the magazine by the unlocking movement. In the operation of this arrangement, the lower assemblyentrance section 56 is adjusted into operative relationship with the upper assembler entrance section 55 prior to the closing of the magazine-change switch 2|. The entrances are returned to normal working position by springs 51, when a locking motion is given to the appropriate lever and link mechanism l8.

It should be understood that the invention is not solely restricted to the details of the form of the invention herein described, since various modifications may be introduced as they become desirable inorder to carry the invention into effect without in any way departing from the scope thereof as defined in th appended claims.

Having described our invention, we declare that what we claim and desire to secure by Letters Patent is:

1. In a typographical composing machine of the kind referred to, a plurality of superposed magazines adjustable into operative relationship with matrix assembling and distributing mechanisms, power operated means for effecting said adjustment, and a power controlled mechanical relay to render said means inoperable while a matrix or matrices are in transit in the distributing mechanism or at the entrances to said magazines.

2. In a typographical composing machine of the kind referred to, a plurality of superposed magazines adjustable into operative relationship with matrix assembling and distributing mechanisms, power operated means for effecting said adjustment, said means having associated therewith a mechanical relay, said relay being controlled by an electric circuit containing a switch, said switch being manually operable in one direction to close the circuit if the distributing mechanism is clear of matrices and operable in the other direction by automatic means.

3. In a typographical composing machine of the kind referred to, a plurality of superposed magazines adjustable into operative relationship with matrix assembling and distributing mechanisms, power operated means for efiecting said adjustment, a mechanical relay adapted to be actuated by said power operated means to unlock the magazines and adjust their position, and an electric circuit incorporating a relay adapted to bring said mechanical relay into cooperation with said power operated means when the distributing mechanism is free from matrices, said circuit including a switch, said switch being automatically operated from the machine to close and open said circuit.

4. In a typographical composing machine of .the kind referred to, a plurality of superposed magazines adjustable into operative relationship with matrix assembling and distributing mechanisms, power operated means for effecting said adjustment, said means having associated therewith a mechanical relay, and an electric circuit passing through a matrix or matrices in the distributing mechanism and rendering said mechanical relay inoperative while said matrix or matrices are in transit in the distributing mechanism.

5. In a typographical composing machine according to claim 4, an electric relay interposed between said electric circuit and said mechanical relay operable to ensure that said mechanical relay only permits adjustment of the magazine when the entrances of said magazines are clear.

6. In a typographical composing machine of the kind referred to, a plurality of superposed magazines adjustable into operative relationship with matrix assembling and distributing mechanisms, power operated means for effecting said adjustment, a pair of cams, one controlling the unlocking of said magazines and the other the movement thereof, and means for actuating said cams operating only when the distributing mechanism is clear.

7. In a typographical composing machine of the kind referred to, aplurality of superposed magazines adjustable into operative relationship with matrix assembling and distributing mechanisms, power operated means for effecting said adjustment, a horizontal bar forming part of said power operated means, a striker rod normally held out of the path of said bar by means of a trip lever, a pair of cams, one controlling the unlocking of said magazines and the other the movement thereof, means connecting said striker rod to said cams to actuate the same, and means for releasing said trip lever only when the distributing mechanism and magazine entrances are clear.

8. In a typographical composing machine of the kind referred to, a plurality of superposed magazines adjustable into operative relationship with matrix assembling and distributing mechanisms, power operated means for effecting said adjustment, a pair of cams, one controlling the unlocking of said magazines and the other the movement thereof, link and. lever mechanism connecting said cams with said magazines, said cams being brought into operation by means of an electric circuit containing a switch, said switch being operable in one direction to close the circuit if the distributing mechanism is clear of matrices, and having a'lever thereon, and a stud on a member of said magazine unlocking mechanism adapted to engage said lever after adjustment of the magazine to operate said switch in the other direction.

9. In a typographical composing machine of the kind referred to, a plurality of superposed magazines adjustable into operative relationship with matrix assembling and distributing mechanisms, power operated means for effecting said adjustment, a horizontal bar forming part of said power operated means, a striker rod normally held out of the path of said bar by means of a trip lever, a profile cam controlling the unlocking of said magazines and a race cam the movement thereof, link and lever mechanism connectingsaid cams with said magazines, means connecting said striker rod to said cams to actuate the same, said trip lever being controlled by an electromagnet, and a switch in circuit with said electro-magnet and manually operable in one direction to close the circuit if the distributing mechanism is clear of matrices and having a lever'thereon, a stud being provided on said link and lever mechanism adapted to engage said lever after adjustment of the magazine to operate said switch in the other direction.

10. In a typographical composing machine of the kind referred to, a plurality of superposed magazines, adjustable into operative relationship with matrix assembling and distributing mechanisms, power operated means for effecting said adjustment, a mechanical relay adapted to be actuated by said power operated means to unlock the magazines and adjust their position, and an electric circuit incorporating a relay adapted to bring said mechanical relay into cooperation with said power operated means when the distribution mechanism is free from matrices.

11. In a typographical composing machine of the kind referred to, a plurality of superposed magazines adjustable into operative relationship with matrix assembling and distributing mechanisms, power operated means for effecting said adjustment, cam controlled link and lever mechanism to unlock and adjust said magazines, and an electric relay adapted to bring said mechanical relay into co-operation with said power operated means when the distribution mechanism is free.

12. In a typographical composing machine of the kind referred to, a plurality of superposed magazines adjustable into operative relationship with matrix assembling and distributing mechanisms, power operated means for effecting said adjustment, and a mechanical relay adapted to be actuated by said power operated means to unlock the magazines and adjust their position, said relay being brought into operation by means of an electro-magnet, said electro-magnet being energised by an electric circuit which is enabled to be closed by the movement of a feeler bar, said feeler bar being only capable of closing said circuit when the distributor is free from matrices.

13. In a typographical composing machine of the kind referred to, a plurality of superposed magazines adjustable into operative relationship with matrix assembling and distributing mechanisms, power operated means for effecting said adjustment, a mechanical relay adapted to be actuated by said power operated means to unlock the magazines and adjust their position, said relay being brought into operation by means of an electro-magnet, said electro-magnet being energised by an electric circuit, and a feeler bar in said circuit movable in relation to the magazine entrance channel whereby said circuit is only closed when said channel is free from matrices.

14;. In a typographical composing machine of the kind referred to, a plurality of superposed magazines adjustable into operative relationship with matrix assembling and distributing mechanisms, power operated means for effecting said adjustment, a mechanical relay adapted to be actuated by said power operated means to unlock the magazines and adjust their position, an electric circuit including a switch and an electromagnet, a feeler bar actuated by said electromagnet through links and levers, towards the matrix path of the distributor bar, a push rod controlled by said links and levers, a second feeler bar associated with said push rod and movable in the matrix path of the magazine entrance channel, an electric relay adapted to be closed on full movement of said feeler bars, and an electro-magnet in said relay associated with said mechanical relay and operating to permit the same to be actuated.

15. In a typographical composing machine of the kind referred to, a plurality of superposed magazines adjustable into operative relationship with matrix assembling and distributing mecha nisms, power operated means for effecting said adjustment, a mechanical relay adapted to be actuated by said power operated means to unlock the magazines and adjust their position, an electric circuit including a switch and passing through matrices on the distributor bars whereby the said circuit is broken on release thereof, and a second circuit energised upon break of said circuit, said second circuit energising an electromagnet associated with said mechanical relay and operating to permit the same to be actuated.

16. In a typographical composing machine of the kind referred to, a plurality of superposed magazines adjustable into operative relationship with matrix assembling and distributing mechanisms, power operated means for effecting said adjustment, a mechanical relay adapted to be actuated by said power operated means to unlock the magazines and adjust their position, an electric circuit including a switch and passing through matrices on the distributor bars whereby the said circuit is broken on release thereof, a relay switch closing a second circuit, an electromagnet in said second circuit, a feeler bar actuated by said electro-magnet, said feeler bar being movable in the magazine entrance channel, a relay circuit adapted to be closed on full movement of said feeler bar, and an electro-magnet in said relay circuit associated with said mechanical relay and operating to permit the same to be actuated.

17. In a typographical composing machine of the kind referred to, a plurality of superposed magazines adjustable into operative relationship with matrix assembling and distributing mechanisms, power operated means for effecting said adjustment, a horizontal bar forming part of said power operated means, a striker rod normally held out of the path of said bar by means of a trip lever, a pair of cams one controlling the unlocking of said magazines and the other the movement thereof, means connecting said striker rod to said cams to actuate the same, an electro-magnet adapted to withdraw said trip lever, said electro-magnet being included in a relay circuit controlled from a second electric circuit, said second circuit including a switch and an electro-magnet, a feeler bar actuated through links and levers towards the matrix path of the distributor bar, a push rod controlled by said links and levers, and a second feeler bar associated with said push rod and movable in the matrix path of the magazine entrance channel, the arrangement being such that the relay circuit is only actuated when the distributor bar and magazine entrances are free from matrices.

18. In a typographical composing machine of the kind referred to, a plurality of superposed magazines adjustable into operative relationship with matrix assembling and distributing mecha nisms, power operated means for effecting said adjustment, a horizontal bar forming part of said power operated means, a striker rod normally held out of the path of said bar by means of a trip lever, a pair of cams one controlling the unlocking of said magazines and the other the movement thereof, means connecting said striker rod to said cams to actuate the same, an electro-magnet adapted to withdraw said trip lever, said electro-magnet being included in a relay circuit controlled from a second electric circuit, said second circuit including a feeler bar, actuated by an electro-magnet through link and lever mechanism and a push rod and movable in the magazine entrance channel, and a relay switch adapted to be closed upon a third circuit being broken, said third circuit passing through any matrices on the distributor bar, the arrangement being such that the relay circuit is onlyactuated when the distributor bar and magazine entrances are free from matrices.

19. In a typographical composing machine of the kind referred to, a plurality of superposed magazines adjustable into operative relationship with matrix assembling and distributing mechanisms, power operated means for effecting said adjustment, a pair of cams, one controlling the unlocking of said magazines and the other the movement thereof, link and lever mechanism connecting said cams with said magazines, an electric circuit incorporating a relay adapted to control the actuation of said cams from said power operated means, a switch in said circuit, said switch being automatically operated to close said circuit if the distributing mechanism is clear of matrices, and a lever on said switch adapted to engage a stud on a part of said magazine unlocking mechanism after adjustment of the magazine so as to actuate said switch to open said circuit.

20. In a typographical composing machine equipped with a plurality of magazines adjustable into operative relationship with matrix assembling and distributing mechanisms, the combination of power operated mechanism for effecting the adjustment of the magazines, and means for controlling the operation of said power operated mechanism, said means including an instrumentality operated by power upon the actuation of said controlling means and which is rendered momentarily inoperative by matrices still in course of distribution into the magazine in use.

21. In a typographical composing machine equipped with a plurality of magazines adjustable into operative relationship with matrix assembling and distributing mechanisms, the combination of power operated mechanism for effecting the adjustment of the magazines, and means for controlling the operation of said power operated mechanism, said means including an electrical relay which is rendered momentarly inoperative by matrices still in course of distribution into the magazine in use.

22. In a typographical composing machine equipped with a plurality of magazines adjustable into operative relationship with matrix assembling and distributing mechanisms, the combination of power operated mechanism for effecting the adjustment of the magazines, a mechanical relay adapted to be actuated by said power operated mechanism to adjust the position of the magazine, and a power operated instrumentality to control the operation of said mechanical relay, said instrumentality being rendered momentarily inoperative by matrices still in course of distribution into the magazine in use.

23. In a typographical composing machine equipped with a plurality of magazines adjustable into operative relationship with matrix assembling and distributing mechanisms, the combination of power operated mechanism for effecting the adjustment of the magazines, a mechanical relay adapted to be actuated by said power operated mechanism to adjust the position of the magazine, a power operated instrumentality to control the operation of said mechanical relay, and a manual device connected to said instrumentality and operable at will to initiate its operation, said connections includin a relay which renders them effective only when there are no matrices in course of distribution into the magazine in use.

24. In a typographical composing machine, the combination of axplurality of magazines adjustable: into operative relationship with, matrix assembling and distributing mechanisms, and electrically actuated mechanism for controlling the adjustment of the magazines, said mechanism including a control switch for closing the electric circuit in initiating the operation of said mechanism.

25. In a typographical composing machine, the combination of a plurality of magazines adjustable into operative relationship with matrix assembling and distributing mechanisms, electrically actuated mechanism for controlling the adjustment of the magazines, said mechanism including a control switch for closing the electric circuit in initiating the operation of said mechanism, and automatic means for opening the electric circuit after the operation of said mechanism has been initiated.

26. In a typographical composing machine, the combination of a plurality of magazines adjustable into operative relationship with matrix assembling and distributing mechanisms, electrically actuated mechanism for controlling the adjustment of the magazines, said mechanism including a control switch operable manually to close the electric circuit in initiating the operation of said mechanism, and automatic means for operating said switch to open the electric circuit after the operation of said mechanism has been initiated.

27. In a typographical composing machine, the combination of a plurality of magazines adjustable into operative relationship with matrix assembling and distributing mechanisms, electrically actuated mechanism for controlling the adjustment of the magazines, said mechanism including a control switch for closing the electric circuit in initiating the operation of said mechanism, and a safety switch to prevent such closing of the electric circuit while matrices are still undergoing distribution.

28. In a typographical composing machine, the combination of a plurality of magazines adjustable into operative relationship with matrix assembling and distributing mechanisms, electrically actuated mechanism for controlling the adjustment of the magazines, said mechanism including a control switch for closing the electric circuit in initiating the operation of said mechanism, and a safety switch to prevent such closing of the electric circuit while matrices are protruding from a magazine in operative position.

29. In a typographical machine, the combination of a plurality of superposed matrix magazines shiftable as a unit in opposite directions to bring a selected magazine into operative position, electrically actuated mechanism for controlling the shifting of said unit in either direction including control means governing the operation thereof, a member operated prior to the shifting operation and adapted to detect obstructions to the shifting movement, and an auxiliary safety device adapted normally to prevent response of the electrically actuated mechanism to its control means, said device being actuated by the detecting member in the absence of obstructions to the operation thereof to permit operation of the electrically actuated mechanism in response .tO said control means.

30. In a typographical machine, the combination of a plurality of superposed matrix magazines shiftable as a unit in opposite directions to bring a selected magazine into operative position, electrically actuated mechanism for controlling the shifting of said unit in either direction including adjustable control means for closing and opening the electric circuit, a member operated prior to the shifting operation to detect obstructions in the path of the shifting movement, and a normally open switch in series with the electric circuit and closed by said member in the absence of obstructions to the operation thereof to thereby permit operation of the electrically actuated mechanism in response to said 5 control means.

RICHARD HENRY SCOTT. WILLIAM FAIRALL GORSE. ARTHUR STANILAND HAYWARD.

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