Patent GB-191217007-A (GB)
Title: Improvements in Typewriters.
Inventor: MOHR JOSEF
IPC: B41J1/00
Filed: 1912-07-22
Granted: 1913-10-22
Abstract: 17,007. Mohr, J. July 22. Type-wheel actions; case-shift mechanism.-In a relay action, the type-wheel is mounted on a rock-shaft, which is connected to the driving- mechanism of the paper-carriage and is released by means of the letter-spacing escapement when the character-keys are operated. The keys can be operated singly or in combination to impart different aggregate motions to series of coupling- sleeves or the like which are mounted on the rock-shaft and control the setting movements of the type-wheel (i). In the arrangement shown in Fig. 1, the type-drum 26 is mounted to rotate and slide for character selection on a tube 24, Fig. 2, secured to a boss 25 on the rock-shaft 23 which is rocked to impress the selected type against the platen 42, the rotary and sliding movements being controlled respectively by series of keys R<1>, R<2> R<3>, R<4> and L<1>, L<2>, L<3>, L<4>, adapted to be operated by a short stroke. The shaft is connected by a link 21 to a crank 16 on a rock-shaft 14<b>, which is controlled by the letter-spacing mechanism. The link 21 is connected to the shaft 23 or 14<b> through a yielding connexion. The tube 24 carries a shaft 27 provided with a hammer or head 28, to which is secured a spring 29<b> engaging a slot in the type-drum. The shaft 27 is controlled from the kevs R<1> ... R<4> through bevel-gearing 32, 48. The shaft 27 carries a loose sleeve 33 formed with a screw 36 engaging a groove 36 in a slide 34 which engages the type-drum, the rotation of the screw and thereby the axial movement of the type-drum being controlled from the keys L<1>... L<4> through bevel-gearing 37, 58. The keys R<1> ... R<4> are arranged over a series of sleeves 47<a>, 47<b>, 47<c>, 47<d>, 47<e> on the shaft 23, the sleeve 47<e> being fast and the others loose. The sleeve 47<a> is secured to the bevel-gear 48 and is provided with a spring which normally holds a pin 56 on the sleeve against a stop 57. The sleeves 47<e>, 47<d>, 47<c>, 47<b> are provided respectively with springs 52<d>, 52<c>, 52<b>, 52<a> which can engage slots in disks 50<d>, 50<c>, 50<b>, 50<a> on the sleeves 47<d>, 47<c>, 47<b>, 47<a>, the slots being concentric with the shaft and being of graded lengths, preferably in the proportions of 4:3:2:1. The springs normally occupy grooves at the ends of the slots and couple the sleeves together, but, when one or more of the keys R<1>.. R<4> are depressed, the corresponding springs are pressed out of the grooves into the slots. The depression of the keys also releases the shaft 14<b> and causes the shaft 23 to rock forward, the type-drum rotating during the forward movement so long as the sleeve 47<a> is not coupled to the shaft 23. When the depressed springs have taken up the lost-motion in their slots, the sleeve 47<a> becomes coupled to the shaft and the rotation of the type-drum ceases. The keys L<1> ... L<4> operate a similar series of sleeves X which control the bevel-gear 58. Instead of the spring arrangement described above for retaining the sleeve 47<a>, the positive device shown in Fig. 12 may be provided. The sleeve 47<a> is divided transversely, the part 47<a1> which carries the bevel-gear 48 being provided with a slide 56 which is normally held by a spring in a notch 56<b> in a stationary member 56<c>. The other part of the sleeve is provided with a disk 56<d> formed with a cam 56<e> adapted to engage a pin 56<g> on the slide 56. In operation, when the play of the sleeves on the shaft 23 is exhausted, the cam 56<e> retracts the slide 56 from the notch 56<b> and engages the pin 56<@> with a gear segment 56<f> fast on the shaft 23, the bevel-wheel 48 being thereby coupled to the shaft. The springs 52 may be arranged underneath the sleeves. (2) In the arrangement shown in Fig. 16, the typedrum 62 consists of a bobbin provided with a series of rotary type cylinders or prisms 64, the arrangement being such that character-selection is effected by rotating and axially moving the bobbin and case-shift is effected by simultaneously rotating the type-cylinders. Preferably there are ten type-cylinders, each provided with nine types disposed in three vertical rows, one row being for small letters, the second for capitals, and the third for figures, so that the capitals and figures can be brought to the outside by simultaneously rotating the typecylinders through 120 degrees and 240 degrees. The bobbin 62 is rotatably mounted on the shaft 61 which is mounted to slide in a bracket 25<a> on a rock-shaft 23<a> corresponding to the rockshaft 23 of the previously-described arrangement. The shaft 61 carries loosely bevel-gears 66, 67, which respectively effect the rotation of the bobbin and the simultaneous rotation of the type-cylinders. For this purpose, the boss of the gear 66 is provided with a pin 69 engaging the bobbin, and the gear 67 is provided with a pin 68 engaging a pinion 65 gearing with pinions 63 formed on or secured to the type-cylinders, the pins 68, 69 having lostmotion with respect to the bobbin and the pinion 65 respectively. The gears 66, 67 are respectively engaged by segmental gears 70, 71 mounted on the shaft 23<a> and controlled by a series of disks S<1> ... S<13>, the disks S<13>, S<5>, S<1> being respectively secured to the shaft 23<a>, the gear 70 and the gear 71. The disks S<2>, S<4>, S<6>, S<8>, S<10>, S<12> are formed as key-depressible slides provided with pins engaging peripheral notches in the adjacent left-hand disks, the pins and the notches operating in the same manner as the springs 52 and notches 54 described above. The axial movement of the bobbin is effected by a gear 73 engaging the toothed part of a stirrup 74 on the shaft 61 the movements being controlled by a series X of key-operated disks. Springs 72, 75 are provided for holding the gears 71, 73 against stops 57. The shaft 23<a> is connected to the driving-mechanism through a yielding connexion consisting of a pin 45<a> engaging a slot in a stirrup 22<a> which is engaged by a spring 46<a>. The gears 66, 67 are prevented from sliding by the engagement of a boss on the gear 66 with the bracket 25<a>. Keyboards.-The keys R<1> ... R<4>, L<1> .. L<4>, Fig. 1, may be operated directly by the fingers, but preferably the arrangement shown in Fig. 13 is adopted, in which ten keys T<1> ... T<10> are provided with tappets for actuating certain combinations of the levers R<1> ... R<4>, L<1> ... L<4>, the other combinations being effected by keys T<11>, T<12>, T<13>, T<14>, which are used together with the keys T<1> ... T<10> and respectively operate the levers L<1>, L<2>, L<3>, L<4>. The keys are all in the same plane, so that the fingers can remain on the keys T<1> ... T<10>, the keys T<13>, T<14> being operated by the thumbs and the keys T<11>, T<12> being operated bv the fingers simultaneously with the keys T<1> ... T<10>. The keyboard may be readily detachable so that another keyboard can be substituted. The keys T<11>, T<12> may each be replaced by ten keys. Letter-spacing mechanism.-(1)The carriagefeed rack 5, Fig. 1, is connected by gearing, comprising toothed wheels 6, 15 and the ratchetcoupling, to a shaft 14<b> provided with escapement-mechanism described below. The carriage is preferably driven by a spring-drum 1 forming part of the machine; or the carriage may be driven by a weight or by an external electro- or spring-motor. If a spring-drum is used, the feed-rack can be geared to a second rack which is pushed in by the right hand to wind the spring. (2) The wheel 15, Fig. 1, gears with a wheel 14 on a sleeve 14<a> loose on the shaft 14<b> but normally coupled thereto by the engagement of an escapement-arm 14<g> with a spring 14<c> secured to an arm on the shaft and guided by a slot in a second arm 14<f> on the shaft. The shaft is provided with an escapement-arm 17 engaged by an arm 18 on a rock-shaft 19, which is operated when any of the keys R<1> ... R<4> are depressed. The escapement-arm 14<g> is controlled by a space-key Z<w>, Figs. 1 and 2, which rocks a shaft 59<c> provided with a finger 59<b> adapted to move the spring 14<e> towards the shaft 14<b>. The arrangement is such that, when the keys R<1> ... R<4> are depressed, the carriage is spaced under control of the escapement-arm 17 and the shaft 23 is rocked for impression, but, when the space-key Z<w> is depressed, the carriage is spaced under control of the escapement-arm 14<g>, the sleeve 14<a> turning independently of the shaft 14<b> so that the impressionmechanism is inoperative. The escapementarms each consist of two unequal arms formed with projecting fingers, the finger on the longer arm of the escapement-arm 14<g> normally engaging the spring 14<e> and the finger on the shorter arm of the escapement-arm 17 normally engaging the arm 18. Carriage-releasing arrangements. - The feedrack 5, Fig. 1, can be lifted by an arm for carriage-release.