IL23481A - Typewriters - Google Patents

Description

PATENTS AND DESIGNS ORDINANCE SPECIFICATION Improvements an Israel of 43 Israel do hereby declare the of this invention and in what manner the same is to to he particularly described ascertained in and by the following This invention relates to typewriters wherein provision is made for alternative use of the writer in typing languages reading from left to such as European languages with Latin characters and languages reading from right to left auch for the Hebrew and Arabic With such a typewriter the problem arises of providing a carriage drive mechanism such that the working direction of the carriage can be reversed as It has already been proposed Patent ification to provide a typewriter for alternate use with an alphabet of a language reading from left and another reading from wherein the working direction of the carriage can be reversed by connecting the drawband to either the one or the other end of the Such a typewriter will hereinafter be referred to as writer of the kind It is an object of the present invention to provide a new and improved typewriter of the kind According to the present invention there is provided a typewriter of the kind specified comprising reversing means coupled to the reversing the direction of operation of the a pair of spaced apart racks articulated as a unit to the typewriter displacing means for displacing the racks as a unit with respect to the carriage in a direction normal to the direction of movement of the carriage for engagement of one or other of the racks with an eseapeiaent pinion of the transmission coupling means for coupling the displacing means of said racks being moved into held in engagement with the According to a preferred feature of the present invention the s a slider adapted to alide on guide carried by the carriage and ing alon length alider being coupled to retaining means located at each end of the guide rod for retaining the slider at either end of the said being coupled to the rack displacement the being suc that when the slider is retained at one end of the said retaining means being coupled to the rack displacement the arrangement being such that when the slider is retained at end of the rod by the retaining the pull exerted on the slider conaequently on the retaining means by the drawband actuates the displacing means so as to move and retain one of the racks in the whilst when the slider is retained at the other end of the rod the other rack is into and retained engagement with the pinion and release means for releasing the retaining means and engaging said slider as it passed from one end of the rod to the Preferably said release means is coupled to the margin release key of the typewrite and is adapted upon depression of the margin release key and when the carriage has been moved to an extreme position to engage the slider as One embodiment of the Invention will now be described by way of example with reference to the accompanying drawings wherein only those of the typewriter necessary an understanding of the invention are shown and in 1 is an elevation of a transmission rack mechanism of the typewriter with the carriage in an extreme position and with the drawband connected for movement of the carriage to the is a view on an enlarged scale of one end of the mechanism shown in 2 is an elevation of the transmission rack mechanism with the carriage in an extreme position and the drawband connected for movement of the carriage to the 2a is a view on an enlarged scale of one end of the mechanism shown in 2b is an exploded view showing the constituent components of one end of the mechanism as shown in 1 3 is a view on an enlarged scale of a detail of the mechanism show in 1 and 2 4 is a front elevation of a direction changeover Fi 5 is a side elevation of the mechanism shown in and 6 shows schematically the coupling between the mchanism shown in 4 and 5 and a typewriter In this specification reference to and right direction refers to directions as seen from the rear of the As in 2a and 2b of the drawings the typewriter is provided a pair of elongated transmission rack members 1 and 2 which are to a plate of a typewriter carriage otherwise in such a manner as to move with the carriage in its longitudinal motion and so as to be capable of sliding in a direction normal to the longitudinal axis of the A pair of shaped levers and are adjacent pairs of ends of the rack members 1 and 2 being rigidly secured to the horizontal limbs of the F shaped A pivoting stud extends downwardly from the extremity of the vertical limb of each F shaped the studs being located in corresponding apertures 6 of pivoted coupling straps 6a and 6b which are respectively sandwiched between the levers 5a and and turning levers 7a and A first pivoting stud upwardly from one extremity of each lever 7 is located in a corresponding aperture in each coupling strap A second pivoting stud extending downwardly from the opposite extremity of each lever 7 is located in a corresponding aperture 31 formed in the plate 31 S assembly just described is articulated to the plate 31 by means of retaining brackets 4a and 4b which are respectively secured to opposite edges of the plate so to leave the coupled racks free for limited sliding motion with respect to the A pair of brackets 8a and 8b are respectively secured to the carriage and passing through apertures formed in their vertical an elongated rod Slidable on the rod 9 is a sleeve which is formed effectively of two pieces 10a and 10b separated by a spacing 1 and rigidly coupled together by a coupling strap Rectangular 5a each has an end projecting into a hollow pivot pin 14 which in end of the levers 7a and 7b and which passes through the rod Sh spring retaining member 1 is as shown in 3 of the biased towards the rod 9 and when this spring retaining member engages in spacing formed in the sleeve 0 it inhibits axial movement of the sleeve on the rod An escapement pinion 15 is on an axle 16 the the pinion with one or other of the racks 1 and One end of a drawband 17 passes a of pulleys on the typewrite not and is secured to the sleeve The other end of the drawband 17 is secured to a drum 19 mounted on the t pewriter frame Reference will now be made to 5 and 6 of the drawings in which can seen details of the carriage direction reversal The mechanism comprises an elongated bar 21 end of which is supported in an aperture 22 formed in the typewriter frame Depending from an Intermediate of the bar 21 is a coupling strap 24 which is apertured and through which passes a coupling member 25 coupled to one of the typewriter The end of the bar 21 opposite the frame 25 is provided with a engaging piece having an elongated aperture 23 through which passes a belt 29 screwed into a support plate 50 with respect to the typewriter frame spring wound around the bolt 29 presses the engaging piece 27 towards plate The engaging 27 is directed towards the 9 and when the bar 21 and the engaging piece 27 are actuated by depression of the key 26 the engaging is displaced into the position shown in dotted lines in 4 and 5 of the In use as shown in 1 of the the sleeve 10 is located at the end o the rod 9 and retained in this position by means o the retaining via sleeve XO the retaining spring so as to bring it the position shown in 1 of the result of which the upper rack engages pinion tf the lower rack out of engagement with this In this position the carriage is free to under the of the drawband from to When the 10 is displaced by to be described to the end of the rod 9 shown 2 of the and is retained there the spring retaining membe 13 the pull exerted lever by the drawband via the sleeve and the retaining displaces the lever the position shown 2 of the drawings as a result of which the 2 are with the lower rack in engagement with the pinion if and with the upper rack The carriage is now free to move from the right to the Reversal of the direction of of the carriage is effected as She typewriter key which can appropriately be the margin release is when the carriage is displaced to its extreme end position wherein the engaging piece 27 engages in the spacing formed between the halves of the sleeve With the engaging piece in this position dotted line position shown in 4 and 5 the the retainin end of the retaining spring 13 lifted out of engagement with sXeeve the sleeve itself still being retained in this position as a result of engagement with the engaging If with this engaging piece 27 still engaging the sleeve the carriage is moved to its 8 opposite extreme position the sleeve will arrive at the position shown in 2 of the drawings where it will become retained by the retaining action of hand retaining spring as soon as the ke is As explained the coupling of the sleeve with the retaining spring at either end of the rod 9 results in a corresponding displacement of the lever 7a or 7b respectively coupled to the retaining springs with the consequent engagement and disengagement of it respective racks 1 and 2 with the pinion As shown in of the drawings the between the typewriter 26 and the bar 21 can be readily effected by any suitable known typewriter key couplin the arrangement being that when the key 26 is downwardly the bar 21 is displaced In the example given above the typewriter key 26 is the margi release key this being particularly advantageous as depression of the key 26 results at the same time in release of the margin stops which allows the carriage to move to its extreme and at the same time the actuatio of the bar so as to engage sleeve It will be that other typewriter keys or even a special key can be used for actuating the direction changing Whils in the specific embodiment described above a specific form drawband direction reversing means has been described consisting of a slider adapted to slide on a guide rod carried by the carriage invention is equally applicable in the case of embodiments where differing forms of reversing means are employed the reversing means described in 8a prescribes the use of a of spaced apart racks which are articulated as a unit to the carriage and which are provided with displacing means which is coupled to the reversing insufficientOCRQuality

Claims (1)

1. CLAIMS A typewriter of the kind specified comprising reversing coupled to the drawband for reversing the direction of operation of the a pair of spaced apart racks articulated as a unit to the typewriter displacing means for displacing the racks as a unit with respect to the carriage in a normal to the direction of movement of the carriage for engagement of one or other of the racks with an escapement pinion the coupling couplin the displacing means to the reversing means so that reversal direction of operatio of the drawband is accompanied by one or other of said racks moved into and held in engagement with the typewriter according to claim 1 wherein the ing means a slider ad pted slide on a carried by the carriage and along the length said slider being the retaining means located end of the guide rod for retaining the slider at either end of the said retaining means led to the rack displacement arrangement being such that whe the at one end of the rod b the retaining on slider consequently on the retaining by the drawband actuates the means so as to r one of the racks in engagement with the whilst when the slider retained at the other end of the rod the other rack is into and retained in engagement with pinion and release means for releasin the retai means and engaging said slider as it is passed one end o the A typewriter according to Claim wherein said retaining means ie constituted spring clip carried by said rod and adapted to engage and retain said said rack displacing means being constituted by lever arrangement coupled on the one band to the rod and on th other to the A typewriter according Claim 2 or wherein said release means constituted by a lever which is pivoted with respect to the typewriter body and which is provided an engaging member adapted to be pivoted into engagement with said slider end so as to release said retaining A typewriter according to Claim wherein said lever is coupled to the typewrite margin release typewriter of Hind c hereinbefore described with n Dated this 3rd day of for the Applican insufficientOCRQuality