US945956A - Type-writing machine. - Google Patents

Description

H. N. JOSLEYN.

TYPE WRITING MACHINE.

APPLICATION FILED SEPT. 20, 1906.

H. N. JOSLEYN.

TYPE WRITING MACHINE.

APPLICATION FILED SEPT. 20, 1906 Patented Jan. 11, 1910.

2 sums-sum 2.

INVENTEIRHI M a w HIE TTIIIRNEVY HUBBARD NJ JosLEYN', or

which the two parts may I rrn STATES OFFICE.

SYRACUSE, NEW YORK, ASSIGNOBTO THE MONARGH TYPE- WBITEB COMPANY, OF SYRACUSE, NEW YORK, A CORPORATION OF NEW YORK.

TYPE-WRITING mncnmn.

Specification of Letters Patent. Patented Jan. 11, 1910.

,Application flled September 20 1906. Serial no. 335,430.

To all whom it may concern:

Be it known that I, HUBBARD N. J 0s I YN, a citizen of the United States and res dent of Syracuse, in-the county of nondaga and State of New York, have invented certain new and useful Improvements in Type to provide improved means whereby the platen of a typewriting machine may be turned to any desired position while the line space wheel is held fixed by its detent and whereby the platen may be positively clutched to the line space wheel at any position to which said platen may be adjusted. In devicesv for this purpose itis important that it be possible to adjust the platen to any desired position whatever, because an extremely sl' ht displacementof some of the letters out of line with the other letters is noticeable in typewriting. It is also very important that the platen and line space wheel be positively clutched together, as the line spacing lever is frequently operated with considerable violence and there will be a slippin of the parts if any such slipping is possib e. Devices in which the platen may be released from the line space wheel so as to render said platen independently rotatable for fractional spacing and in be agamsecured together in ad usted ,osition, have heretofore usually been o two general kinds: namely, those in which the arts are connected by some form of friction device and those in which they areconnected by some 'form of toothed clutch mechanism. The friction clutches'permit of an adjustment of the platen to any degree of fineness, but these clutches are open to a number of objections. It has been found extremely difliis violently operated and such clutches have usually comprised a stiff spring, the tension to be overcome by hand when of which had the clutch was disengaged. In those site finenessof adjustment.

to a clutchbetween the platen and displacement a perspective I clutches in which toothed members are employed it is possible to clutch the two members together positively, but in most of such devices it is not possible to secure the requi- These devices are adapted to clutch the members together only in certainpfedeterminedrelative positions, in which t e teeth of the clutch members are in register; and when the platen is adjusted to the precise position desired, it will be displaced to a' greater or less extent when the clutch is thrown in unless this position happens to coincide with one of said predetermined positions, the extent of such depending on the size of the clutch teeth.

cured by making the teeth very small, but .even with the smallest teeth that it is practicable to employ the displacement that is liable to occur when the clutch is thrown in is sufiicient to be very objectionable.

The present invention embodies a toothed clutch mechanism and it is of such a character that the teeth may be of cod size, and the platen may be positively c utched to the line space wheel in any position to which it may be adjusted. That is to say, no matter in what position theplaten is set it will be positively clutched to the line space wheel withoutbeing displaced relatively to said line space wheel.

- In the accompanying drawings, Figure 1 is a central longitudinal sectional view of v the platen and line space wheel and some of the associated parts of a Monarch typewriter having one form of my invention applied thereto. Fig. 2 is a left-hand end view of the platen and line space Wheel and some of the associated parts with the platen rod shown in section and some of the parts of the mechanism removed. Fig. 3 is a diarammatic view similar to Fig. 2 but showlngthe parts in a difierent relation. Fig. 4 is a perspective view of the left-hand platen head. F'g. hand part of Fig. 1, but showing the platen unclutched from the line space wheel. Fig.

6 is a diagrammatic view of some of the parts shown in Fig.2 but with the dogs in retracted or unclutched position. Fig. 7 is dogs. Figs. 8, 9 and 10 show another form of With these devices a certain degree of fineness of adjustment can be ,se-

5 is a view similar to the left-.

view of one of the clutching left-hand face the invention. Figs. 8 and 9 are fragmentary longitudinal sectional views through the lefthand end of the platen and some of the parts associated therewith, the clutch being shown in normal position in Fig. 8 and in its released position in Fig. 9. Fig. 10 is a perspective view of one of the clutching dogs used in this form of the invention.

My invention is applicable to typewriting machines generally but I have here shown it applied to that sort of typewriting machine in which the keys and printing instrumentalities are mounted in a stationary frame/ and in which the paper is passed about a rotary platen. Some of the features shown in the drawings are those ordinarily employed in the Monarch typewriter. This machine has a paper carriage comprising two forwardly extending end pieces 1, in which is mounted a roller platen 2. Said platen has a shaft 3 having a left-hand finger wheel 4 and a right-hand fin er wheel 5 mounted on the ends thereof an secured to the'shaft by set screws 6 threaded through the hubs of the finger whetls and engaging the shaft. Just inside of each'of said. hubs there is a bearing sleeve 7 that loosely surrounds the shaft and that passes through the and piece 1 of the carriage where it is secured in position by a set screw 8 threaded through said end piece from below andengagin the sleeve. "The construction is such that t e sleeves 7 are thus held rigid in the carriage and the shaft 3 is journaled in them. The aten has a right-hand platen head 10 which is secured tothe shaft 3 by a set screw 11 threaded through the hub of said platen head and which is secured to the platenhy screws 12. In the Monarch machine the line space mechanism is at the lefthand end of the platen and said platen has a left-hand platen head 13, the former of which I have modified in order to ads t it tom clutch mechanism. The platenv ead 13 w ichis shown in detail in Fig. 4, is securedto the platen by screws 14 in the usual manner, said screws passing through coun-' tersunk openings v15. As is best shown in said Fig. 4:, the outer face of the platenhead 13 has projecting therefrom three annular ribs or three segments of an annular rib or flange 16, said segments being se arated by three openings or slots 17 in w ich three clutching dogs 18, 19 and 20 are maintained in such fashion that theyare free to slide readily in and out ina direction toward and from the shaft 3,. they being guided in such movements by the walls of the slots 17.

The line space wheel-22 is in the form of a ring having an angular cross-section, as shown in Fig. 1, thus forming a flange, the of which has the usual crown ratchet teeth 23 formed therein for coiiperation with the line space pawl (not shown) and withthe detent roller 24 which is jouror recesses between said teeth.

naled in the usual way in a spring arm 25 that is secured to the left-hand end piece 1 of the carriage. The detent roller 24, being pressed by the resiliency of the s ring arm 25 toward the right, normally hol s the line space wheel in one or another of the line space positions in the usual Way, but this roller prevents the line space wheel from occupying intermediate positions. The other flange of the line space wheel extends inward and has a series of internal teeth 26 formed on its inner surface, leaving notches The points the periphor edges of these teeth bear on cry of the annular projection or ro ections 16 which thus form the bearing or the line space wheel. a The faces of the teeth 26, or the sides of the notches or recesses between said teeth, constitute contact surfaces for cooperation with certain dogs or clutch devlces presently to be described. Where, in the claims, I use the word tooth or its derivatives, referring to the teeth 26, I mean such expressions to be construed broadly to include any configuration of the parts resulting in contact or engaging surfaces having the function of the teeth 26 shown in the present instance. It may loe possible to produce these contact or engaging surfaces without producing teeth which project like those shown in the drawings; and I would regard such constructions as bein the equiva'lents of that shown and described in the 1 present case.- The projections 16 are cut as shown in Fig. 4. at 27 in order to permit of the insertion of the screws 14.. The teeth 26 asseen from the face of the wheel, are pointed, both working faces of each tooth bein at an inclination to the radius of the whee? and preferably at the same inclination to said radius. 'As shown in the present instance these teeth have their opposite faces at an angle of about 60 with-"each other. I have found this to be a good angle for the purposes of this form'of the invention, but 110 it may be varied. to a considerable extent. Each of the dogs-18,19 and 20 has its outer end formed'into a tooth 28 adapted to enter the notches or recesses between the teeth 26, the two faces of the teeth 28 being inclined 1 to correspond with the inclination of the working faces of the teeth 26 so that if the platen happens to stand in the position shown in Fi 3 for example, in which the tooth 28 of a e dog 20 happens to extend to 120 the bottom of the notch between two of the teeth 26, the tooth 28 fits nicely in said. notch. I

The platen head 13 inside of the platen 2, has a part 3O that fits snugly within the 125 core of t e platen, and a cylindrical extension 30 in which are three holes 31,extend ing from the left-hand face of the platen head and terminating short of the righthand end of the extension 30. In these holes 3 uncouple or disengage are seated three plungers 32, having sprin s 33 compressed between their right-hand en s and the bottoms of the holes 31. The lefthand end ofeach of these plungers is beveled, as shown in Fig. 1, at 34 to form a Wedge or cam which contacts with the inner end of one of the dogs 18, 19 and 20, which inner ends of'said dogs are formed at an inclination corresponding to that of the wedge face 34. The construction is such that the springs 33 press the plungers 32 toward the left and the wedge or camming action of these plungers tendsto press the dogs 18, 19 and 20 firmly into engage ent with the teeth 26 of the line space w eel. The inclination of the wedge 34 isso slight that even if very great pressure be exerted tending to move the dogs 18, 19 and 20 toward the shaft 3, such pressure would not cause the plungers to be moved toward the right. The construction is such that when one of the dogs is thus wedged into engage- -ment with one or both of the sides of a notch between two of the teeth 26, such engagement is positive and cannot be released by pressure on the dog. "When it is desired to the platen from the line space wheel all of the wedges 32 are pressed toward the ri ht against the tension of their springs 33 y a disk 35 slidably mountedon the shaft;3 just the left-hand ends of said wedges. The shaft 3 has a longitudinal slot 36 cut therein and a pin 37 proects from the disk 35 into said slot. A pus pin 38 lies loosely in the longitudinal slot 36 and extends out through the middle of the left-hand finger wheel 4, said push rod having a push button 40 mounted on its outer end. In order to bring the outer end of the rod 38 into the axis of the shaft 3, said rod is off-set as shown at 41 and the slot is deepened near the end of the shaft, as shown at 42. The ofi-set 41 prevents the push rod 38 from being withdrawn lengthwise from its seat. struction'is such that if the button 40 be pressed toward the right, the rod 38, acting 1 onthepin'37, will push the disk 35 towar the right, pressing all of the wedges 32 back to the position shown in Fig.5.

I have provided means for withdrawing the dogs 18, 19 and 20 from the recesses or notches in the line space wheel when the button 40 is pushed in as described. In the form of the invention shown in Figs. 1 7,

- each of said dogs has pro ecting from its left-hand face a pin' 43 against which there presses the free end of a light spring 44 which is secured at its opposite end to the flan e 16 by a screw 45 and which presses against a stationary pin 46. When the wedges are Withdrawn these springs 44 move the dogs platen and out of the way of the teeth 26,

35 the springs being merely of suflicient strength to effect to the left of:

The contoward. the center 'of the this result. When the parts are in this position the platen may be turned to any desired position by means of the finger wheels 4 and 5 without turning the line space wheel.

I have provided a cover. 47 which is secured to the platen head 13 by screws 48 (Fig. 1) which pass through said cover and are threaded into openings 49 the flanges 16. The cover 47 is recessed in the middle to permit of the motion of the disk 35 and it also has an annular groove I 50.formed in its right-hand face to aoconr modate the pins 43 and springs 44. The inner end of this cover is seated within the flan e of the line spacing wheel which carries the teeth 23 and forms a bearing therefor and also engages the inwardly projecting-flange of the line space wheel and retalns said wheel in position, preventing displacement of said wheel toward the left. Said cover also retains the dogs 18, 19 and 20 in position in their guide-slots and protects the parts from dust and injury.

The "partsare so designed that the angular distance from the point of the tooth 28 of one dog to the point of the tooth of either of the others is not equal tance occupied by any whole number of the teeth 26. This relation may be secured in any one of a number of ways. In the present instance I have shown fifty-seven teeth 26. This number fifty-seven is exactly d1- visible by three so that if the points of the teeth 28 of the dogs 18, 19 and 20 were uniformly spaced, that is to say, if they were spaced 120 apart, the relation above referred to would not obtain. As shown in the diagram in Fig. 6, the points of the teeth 28 of the dogs 19 and 20 are off-set from the center lines of said dogs so that the distance from the point of the tooth 28 of the dog 18 to the point of the tooth 28 of either of the dogs 19 and 20 is equal to nineteen and onefourth of the teeth 26 and the distance between the points of the teeth 28 of the dogs 19 and 20 is equal to eighteen and one-half of the teeth 26. When the parts are in the position shown in Fig; 2 the dog 18 is in full engagement with one of the notches between two successive teeth 26,the dog 1.9 is in about one-half engagement with one side of one of said notches and the dog 20 in about onehalf engagement with one side of one of said. notches. It will be noted that in this particular position of the parts the dog 18 tends to hold the line space wheel from turning relatively 'to the platen in either direction and if this dog had a sufficiently tight fit in its 4 slot 17 it would alone be sufficient to hold the wheel. this position of the parts the dog '19 willosit1vely prevent rotation of the line spacmg wheel relatively to the platen in .the direction of the arrow in Fig. 2, and that the It will be. perceived that in' (Fig, 4) in to the angular dis- &

dog 20 will positively prevent rotation ofsaid. line spacing wheel relatively to the platen in the opposite direction. The poorest engagement that can be effected between the parts is that shown in Fig. 3 inwhich a I tooth of one of the dogs, say 20, is in full enhold the line spacing wheel against any rdtation whatever relatively to the platen. Ordinarily the platen would not happen to be arrested relatively to its line spacing wheel in either of the two positions shown in Figs.

2 and 3 but in some intermediate position in which no one of the points of the teeth 28 would extend fully to the bottom of the notch between two of the teeth 26. No matter what relative rotative adjustment the parts may have there will always be at least one of the dogs that engages one side of one of the notches when the clutch is in operation and thus positively prevents rotation of the line spacing wheel independently of the platen in one direction and at least one other dog that engages the opposite side of another notch and thus prevents rotation of the line spacing Wheel independently of the platen in the o posite direction. The line spacing wheel will thus always be positively locked against turning relatively to the platen in either direction and these two elements will therefore be rigidly and positively clutched together so that an actuation of the line spacing mechanism at this time will cause the line spacing wheel an'd platen to turn together.

It will be understood that the springs 33 do not need to be heavy springs but may on the contrary be rather light sothat the force with which the dogs are pressed into the re cesses between the teeth 26 is not sufiiciently great to cause the platen to turn with relaT tion to the line space wheel should one do engage in advance of another, but when al of the dogs are pressed to operative position the wedges 32, 34 positively retain them in such positions so that they cannot be moved back toward the shaft 3 by any force applied at their outer ends. I

It will be understood, of course, that the different wedges 32 will usually move different distances when the pressure of the fingcr'or thumb on the button 40 is released.

Thus when the parts stand in the position shown in Fig. 3, the dog 19 is nearly in its retracted position and the corresponding wedge 32 has therefore been permitted to move toward the left but a short distance. The dog 18 has moved farther from its retracted position and its wedge 32 has there fore moved farther toward the left. The

dog 20 is in its extreme outer fully engagedposition and the corresponding wedge must therefore have moved 'to its extreme lefthand position. If the button 40 be now pushed in, the disk 35 will obviously first encounter the wedge 32' associated with the dog 20, next that associated with the dog 18 and last of all that associated with the dog 19. If the button be released without moving the platen the springs 33 will move the button toward the left. In this motion the wedge 32associated with the dog 19 will obviously be arrested first, thenthe wedge' 32 associated with the dog 18 will be arrested and last of all the wedge 32 associated and 10, most of the parts that are common to the two forms of the invention are designated by reference characters similar to those used in the other figures. The form of the platen head 13 and the line space wheel are the same as those already described. The

three dogs 18, however, do not have thepins 43 but each of said dogs has projecting from its inner end toward the left a toe or cam 51 as shown in detail in Fig. 10, said cam'being adapted to coiiperate with the inner surface 0 an internally. coned flange formed on the pusher or d1sk 35*. Then said disk is pushed toward the right to the position shown in Fig. 9 the inclined conical surface of this flange engaging the inclined faces of the toes 51 positively cams the dogs toward the shaft 3, thus positively withdrawing them .from en agement with the teeth 26. In this form of the invention each of the plungers .or wedges 32 has a straight extension 53, the end of which is adapted to contact with the flat face 54 of the disk 35*. When the rod 38 is pushed toward the right this flat face of the disk 35, acting on the prolongations 53 of the Wedges 32 pushes said wedges toward the right and in y the last part of the motion of the disk35 the coned face of the fiange52 engages the toes 51 and withdraws the dogs to their inoperative positions.

The construction of the parts is such that the platen ma be readily removed from the machine witl iout disturbing the platen clutch. If it 'be desired to thus remove the platen the set screw 6 of the left-hand finger wheel 4.- is loosened and said finger wheel is removed. In this 0 eration the push rod 38 will be withdrawn from its slot 36 and will remain associated with the finger wheel.

ceases 4 pin When the shaft is set in place said dogs will always prevent relative moteeth to prevent re tion of said elements in the other direction ments in the ot no matter in what relative positions the two said dogs positive parts may happen to be, It will, of course, any tendency to re be understood that more than "three dogs elements, whereby s may be provided if desired, but three is tively, enough to insure the mode of operation tion tl specified. The broad principle of this clutch. clutch is capable of embodiment in a great 4, In a clutch device, variety of forms, some of them differing two rotary elements tobe widely from either of the forms shown in a circular serie the present case. I therefore do, not re ard ments, a plurality of dogs 0 my invention as limited to the precise orm said elements, and of clutch shown in this case but wish to any I be understood as claiming the invention wedge broadly. with sai What I claim as new and desire tosecure tive by Letters Patent, is ment 1. In a clutch device, the combination of ofsaid elements at least one o two elements to be clutched together, a series positively prevent relative ro of teeth on one of said elements, a plurality elements in one of separately movable dogs on the'other of said dogs will positive said elements, and means for moving one of rotation of said elemen said dogs differentially to enga e a tooth on direction.

one side to positively prevent re ative motion 5. In a clut of said elements in one direction and for two rotary ele moving another of said dogs differentially to a series of tee each adapted engage a tooth on the other slde to positively three dogs,

revent relative motion of said elements in side of any one 0 so the other direction-and for holding said do s cams for moving sai positively against displacement by any ten with said teeth, the ency to relative motion between said elethat 'in any relative ments, each do moving1 into engagement a ments, at least ative potively prevent sition of said elements, whereby said elements in one distance depen ing on t e exact re relative position f said. elemen elements in one direction and nother of said dogs into engageside only of one of said on of said eledirection and for holding ly against displacement by lative motion between said aid elements can be posiy relative posiclutched together in an by the LQIGOf without displacement s of teeth on. o

wedge mea elative position 0 each of said (1 d teeth without dis osition of the elements,

eing such that in any ments to be 0 th ou one of s to engage ei th, spring pressed (1 dogs into engagement arrangement being such position of said elef said ddgs will posirelative rotation of said eledirection, and at least one of 130 The set screw 11 of the right-hand platen ments can be positively clutched together in head is next loosened and the shaft 3 is any pulled. out from the right, thus leaving the displaced by the c platen entirel free from the machine. 2, in a clutch 5 When the sha is thus withdrawn the disk two elements to be 35 is maintained in its p'roper'position by of teeth on one of the cover 47 in which it is inclosed. When rality of separately mo it is desired to replace the platen on the other of said elements, machine the platen is set in position between being adapted to eng 14; the two sleeves 7 and the shaft is inserted one of said teeth, and

from the right. passing freely through the such that in any relative platen head 10 and through the platen head elements, at least one 13 and its extension 30 and also through the vent relative motion disk 35. In inserting the shaft into the disk one direction and at 5 35 it is, of course, essential that said shaft be will prevent relative turned until the slot 36 registers with ti e in the. opposite direction, t .e holding said dogs in enga set screw 11 is tightened, the rod 38 is inteeth serted in its slot 36 and the finger wheel 40 V3. in a properly positioned and secured in position two elements to be by tightening the set screw 6 of teeth on one of'said Some of the features of the invention on the other 0 herein set forth are broadly new. As far as ed to engage cit I am aware it is broadly new to provide a means operative in any re 5 plurality of dogs that are adapted to coopersaid elements for moving at ate with a series of teeth in such fashion dogs into engagement with that when the clutch is in use, at least one of one of said teeth to preve said dogs will always prevent relative moof said tion of the two elements to be clutched to,- moving a 30 gether in one direction and at least one of ment with the other lative moti thereof with out being device, the combination of clutched together, a series said elements, and a pluvable dogs on the each of said dogs ther side of any the arrangemen position of the two said dogs will preof the two elements in least one of said dog's motion of said elements and Wedges for gement with said t being a clutch device, the combination of clutched together, a series elements, three dogs ts and each adapther side of any of said teeth, lative position of least one of said. one side only of t relative motion for the combination of lutched together,

ne of said eleer of us operative in f said elements to s into engagement turbing the relathe arrangeative position if said dogs will tation-of said direction and at least one of ly prevent relative ts in the opposite the combination of lutched together,

aid elements,

ther

said dogs will positively prevent relative rotation of said elements in the opposite d1rection, and means for releasing sa1d,dogs.

' 6. In a clutch device, the combination of two rotary'elements to be clutched together,

a series of teeth on one of said elements, each of said teeth having inclined faces, a plurality of dogs on the other of said elements,

each of said dogs having two engaging faces.

inclined to correspon with the inclined faces of said teeth and each of said dogs being movable into and out of engagement with said teeth, and means operative in any relative position of said elements for mov-. ing each of said dogs into locking engagement with said teeth without disturbin the relative position of said elements an for holding the dogs positively against displacement by any tendency to relative motion,

between the elements, the arrangement being such that in any relative position of said ele-. ments at least oneof said dogs will have one .of its faces engaging one of the faces of one faces, a plurality of dogs on the other of said elements, each of .said dogs having two engaging faces inclined to correspond with the inclined faces of said teeth and each of said dogsbeing movable radially into and out of engagement with said teeth, the arrangement being such that in any relative position of said elements at least one of said dogs Wlll have one of its faces engaging one of the faces of one of said teeth to prevent relative motion of said elements in one direction, and at least one of said dogs will have one of its faces engaging one of the faces of one of said teeth to prevent relative motion of said elements in the opposite direction, and spring pressed Wedges, movable parallel to the axis of said rotary element for camming said dogs into engagement with said teeth.

8. In a typewriting machine, the combination with a platen and a line space wheel, one of which elements carries a series of teeth having inclinedlocking faces, of three dogs having inclined locking faces, means for moving said dogs into engagement with said teeth the arrangement being such that in any relative positlon of said elements at least one of said dogs will engage one side or 'face of one of said teeth and at least one of said dogs will engsge the other side or face 9f one of said teet and in some relative ad- Justments of the parts any one of said dogs will be engaged on one of its faces and in I other-adjustments the same dog will be eneasing' said do s, whereby said platen is ositively and re easably connected with said ine space wheel by wedge action. I 9. In a typewriting machine, the combination .of a i teeth, .a which said line space wheel is mounted and relatively towhich the platen and platen head may be turned, three dogs mounted in said platen. head for rad al motion into and out of engagement with said teeth and so disposed that in any position of said platen with relation to said line space wheel at least one of said dogs will be adapted to hold said platen against motion in one dlrection and at least one of said dogs will be adapted to hold said platen against motion in the OtlIQI'dlI'BC-t'IO Il, Wedges movable longitudinally of said laten and controlling said dogs, and means or-moving said wedges.

' 10. In a typewriting machine, the combination of a line space wheel having internal teeth, a platen having a platen head on which said line space wheel is mounted and relatively to which the platen and platen head may be turned, three dogs mounted in said platen head for radial motion into and out of engagement with said teeth and so disposed that in any posit-ionof said platen with relation to said line space wheel at least one-of said dogs will be adapted to hold said platen against motion in one. direction relatively to the. line space wheel and. at.

least one of said dogs will be adapted tohold. said platen against motion relatively to the line space wheel in the other direction, wedges movable longitudinally of said platen and controlling said dogs, springs or moving saidwedges to-l0cking position, and hand operatedmeans for moving said wedges to inoperative position. 7 11. In a-typewriting machine, the combine space wheel having internal platen having a platen head on" nation of alme space wheel having teeth,

a platenjhaving'a platen head, on whlch said line space wheelis mounted and relatively to which his adapted totu'rn', a dogmounted in said platen head for'motion nto and out of engagement with said teeth,"aspring pressed wedge independent of said dog and movable longitudinally of said platen and operating to force said dog into engagement with said teeth,'a platen shaft, and a rod extending longitudinally of said shaft and adapted to move said wedge against the ten- $1011 of its spring. 1 2. In a typewriting machine, the combination of a line space wheel having internal teeth, a laten having 'a platen head on which said line space wheel is mounted and relativel to which it'may'be turned, a plurality. 0 locking dogs mounted in said.

assess of said shaft, and means whereby said rodcontrols said dogs.

13. In a typewriting machine, the combination of a platen having a platen head and a shaft, a line space wheel relatively to which the platen and platen headmay be turned and having a series of teeth with inclined locking faces. three dogs mounted in said platen head and having locking'faces inclined tocorrespond with the faces of said teeth, means for moving said dogs into space wheel engaged with the platen head i and platen by wedge action and the dogs being so arranged that in any relative position of said platen and line space wheel at least one of said dogs positively holds said platen against rotation relatively to said line space wheel in one direction and at least one of said dogs positively holds said platen against rotation relatively to said line space wheel in the opposite direction, a hand operated rod extending longitudinally of said shaft, and means controlled by said rod for releasing said dogs.

1- In a typewriting machine, the combination of a platen having a platen head and a shaft, a line space wheel adapted to turn with and to afiord an independent rotation of said platen and platen head and having a series of teeth'with inclined locking faces, three dogs mounted in said platen head and having locking faces inclined to correspond with the faces of said teeth, means for moving said dogs into engagement with said teeth, the construction being such that said dogs hold said line space wheel to the platen by wedge action and the dogs being so arranged that in any relative position of said platen and line space wheel atleast one of said dogs positively holds said platen against rotation relatively to said line space wheel in one direction and at least one of said dogs positively holds said platen against rotation relatively to said line space wheel in the opposite direction. a hand operated rod extending lon itudinally of said shaft, and a disk surroun ing said shaft and controlled by said rod for, releasing said dogs.

15. In a typewriting machine, the combination of a platen having a platen head with a flange or projection onone face thereof, a line space wheel rotatably mounted on said flange and having internal teeth, and lockin dogs mounted in slots in said flange and a apted to lock said line space wheel and said platen together.

16. In a typewriting machine, nation of a platen having a platen head with the face of said platen said flange.

the combi-- a flange or projection on one face thereof, a line space. wheel rotatably mounted on said flange and having internal teeth, locking dogs mounted in slots in said flange and adapted to lock said line space wheel and said platen together, and wedges movable longitudinally of said platen and adapted to move said dogs into locking engagement with said teeth.

17. In a typewriting machine, the combination of a platen having'a platen head with a flange or projection on one face thereof, a line space wheel rotatably mounted on said flange and having internal teeth, locking dogs mounted in slots in said flange and adapted to lock said line space wheel and said platen together, and a cover secured to head and serving to retain said-line space wheel in position on 18. In a typewriting machine, the combination of a platen having a removable shaft, a line space wheel, a platen clutch connecting said line space wheel with said platen, means for releasing said platen clutch comprising a rod lying in a groove in said shaft, and a member surrounding said rodand having a pin extending into said groove, and means for retaining said member in position when said shaft is removed. i

19. In a typewriting machine, the combination of a platen, a line space wheel, and a clutch for coupling said platen and line space Wheel together, said clutch comprising a series of teeth, a dog adapted to cooperate with said teeth, and means operative in any relative position of the line space wheel and platen and including a spring-pressed wedge or cam for movin said dog into contact with one 'or more 0 said teeth in the precise position in which said teeth may happen to stand in any relative adjustment of the parts and without disturbing the relative position of said parts,

the dog moving difiierent distances depending on the relative adjustment no of the parts, and for holding said dog in the position to which it has been moved, said means holding the dog dpositively against displacement by an ten ency to relative'motion between the ine space wheel and-platen.

20. In a typewritingmachine, the combination of a line spacing wheel, a platen" adapted to rotate with and indepen ently thereof, teeth carried by one of said parts, independently movable do s eotiperating with said teeth and carried %y the other of said parts, and independently operablev wedges coiiperating with said dogs, one for each dog.

21. Ina typewriting machine, the combination of a p able dog engaging said teeth, and .a hand 13o operated clutch releasing device comprising a cam movable longitudinally of the platen for positively withdrawing said dog from engagement with said teeth.

22. In a typewriting machine, the combination of a p aten, a line space wheel and a clutch for con ling these two elements together, said c utch comprising a series of teeth on one of said elements, a plurality of radially movable dogs engaging said teeth, and a hand operated clutch releasing device comprising a cone-shaped cam movable longitudinally of said platen and adapted positively to withdraw said dogs from said teeth.

23. In a typewriting machine, the combination of a platen, a line space Wheel, a clutch for coupling these two elements together, said clutch comprising a series of internal teeth on said line space wheel, a plurality of radially movable dogs engaging said teeth, and a hand operated releasing device comprising a. member movable longitudinally of said platen and having an internally cone-shaped cam surface for Withdrawing said dogs from said teeth.

24. In a typewriting machine, the combination of a platen, a line space wheel, a clutch for coupling these two elements to gether, said clutch comprising a series of internal teeth on said line space wheel, a plurality of radially movable do s engaging said teeth, wedges movable longitudinally of the platen for. pressing said dogs into engagement with said teeth, and a hand operated releasing device comprising a member movable longitudinally of said platen and adapted to withdraw said wedges,-and means for withdrawing said dogs from said teeth.

25. In a typewriting machine, the combination of a platen, a line space wheel, a clutch for coupling these twoelements together, said clutch comprising a series of internal teeth on said line s ace wheel, a plurality of radially movable dogs engaging said'teeth, wedges movable longitudinally of,

the platen for pressing said dogs into enthereof, teeth carried by one of said parts,-

and independently movable dogs cooperating with said-teeth and carried by the other of said parts, independently operable spring pressed wedges cooperating with said dogs, one'for each dog, whereby a simultaneous or successive engagement between said dogs and teeth may be effected through said independently operable wed es' depending on the relations between the and platen and whereby the line spacing wheel and platen may be positively locked together and maintained 1n any relative adustmentthey may assume.

me spacing wheel 27. In a typewriting machine, thecombiv nation of a line spacing wheel, a platen adapted to turn with or independently of said line spacing wheel, and means for'positively connecting the line spacing wheel and platen to turn together at any point or relative adjustment'between the two, said means comprising a plurality of teeth connected with one of sa d parts and a plurality of in dependently movable teeth operatively connected with the other of said parts and adapted to positively engage said first mentioned teeth at different depths in the space between them depending on the precise relative adjustment of said parts.

' Signed at Syracuse, in the county of Onondaga, and State of New York, this 18th'day of September, A. D. 1906.

HUBBARD N. JOSIIEYN.

Witnesses:

Gnonen A. 81111;, W. J LOGAN.

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