US1496940A - Typewriting machine - Google Patents

Description

June 10. 1924.

L. C. MYERS TYPEWRITING MACHINE Filed Aug. 22 1923 2 Sheets-Sheet 1 LMIG 3 2 5'2 ldaitented June i9, 192%.

UNEWE TATES l dddfidd rarest earica.

LEWIS O. MYERS, OF FREEPORT, NEW YORK, ASSIGNOR TO ROYAL TYPEWRITER COM- PANY, INQ, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

TYPEWRITING MACHINE.

Application filed August 22, 1923. Serial No. 658,717.

To all whom it may concern:

Be it known that I, Lnwrs C. MYERS, a citmen of the United States, and resident of Freeport, in the county of Nassau and State of New York, have invented certain new and useful Improvements in Typewriting Machines, of which the following is a specification.

It has been previously proposed to make' the platen of a typewriting machine removable from the platen frame, in order that new platens or those of different characteristics may be readily installed, and a device of this character is shown in patent to Hess, No. 990,736, April 26, 1911.

I is also old to provide what is known asfractional line spacing, or devices for writmg intermediate the lines, and to so arrange the mechanism that when the regular line spacing devices are again brought into use, the regular line spacing will start from that exact point. Devices of this character are disclosed in patent to Dowd, No. 1,312,024, August 5, 1919.

In general these fractional line space mechanisms include elements that extend into the interior of the platen and are shiftable from one position to the other and are frequently actuated by a rod sliding within the platen axle. For this reason no construction is known prior to my invention by which a platen which is equipped for fractional line spacing can be readily removed from its bearings inthe' platen frame or vide such mechanism that is simple in construction' and in which the platen may be quickly detached and as quickly replaced, and in which the parts of the fractional line space mechanism carried by the platen and those mounted on the platen frame will automatically register upon the replacement of the platen.

for the right hand end of the platen.

Other objects of the invention will be apparent from the following detailed description and the appended claims.

In the drawings:

Figure 1 is a perspective View of the right hand side of a typewriter carriage of the well known Royal typewriter, with a platen axle in section.

Figure 2 is a similar view showing the platen removed from the carriage and the latch in released position.

Figure 3 is a front view of the carriage and platen with parts omitted and parts in longitudinal section.

Figure dis a view of the platen removed with parts of the platen in the portion of the fractional line space mechanism carried thereby in section.

Figure 5 is an end view of the platen removed.

Figure 6 is a side view on a larger scale of the left hand end of the platen and the fractional line space mechanism associated therewith.

Figure 7 is a longitudinal section through the portion of the fractional line space mechanism remaining in the carriage when the la-ten is removed.

Figure 8 is a fragmental top plan View of the left hand end of the carriage and special supporting mechanism for the fractional line space mechanism.

Figure 9 is a perspective view of the latch A laten carriage has side plates A and A joined at the bottom by a rail a supported by ball bearings a upon a shiftable track a in the usual manner. The usual rack a is attached to the side plates. A platen B has a sleeve 3) which is fastened by screws 6 to the platen axle C. At the right hand end of. the axle a sleeve 6 is fastened thereto by screws 6 and carries a finger wheel 6 by which the platen may be turned manually as desired. Interposed between the sleeves b and b is ashort sleeve loose on the axle C and having an annular groove b". The right hand carriage plate has a cut out A into which the sleeve passes when the parts are assembled, the groove 6 being entered by the edge of the sidewall.

To hold the platen axle in position in the carriage, there is provided a latch member D shown in perspective in Figure 9. This latch is pivoted on an eccentric screw D for purposes of adjustment and has an upper hook end D curved at d to fit within the groove b. The latch is also provided with a finger piece (1 and a U-shaped offset (1 which hasits free arm longer than the other to engage the side plate A and guide the latch in its movement. The bend of this offset member will also engage the side plate and 'limit the movement of the latch towards its holding position.

The carriage is provided with a feed roll release lever E pivoted at E to the side plate A and having a mutilated gear 6 on .theend thereof that meshes with a mutilated gear 6 on the paper feed roll and is held in placeby a screw 6 The latch D has a tail d which contacts with the screw 6 to limit the movement of the latch D when moved to releasing position as shown in Figure 2. The latch also has an ear d to which is attached one end of a returning spring (i the other end of which is fastened to the screw E or to some other part of the paper feed .roll release lever E. This spring tends to hold the latch in position to retain the platen in its proper position in the carriage.

The line space mechanism is of the usual Royal type and comprises a pawl F pivoted to a carrier F at f and engaging a rachet f normally rotating with the platen. A finger piece F adjusts the position of a guard plate i and determines the point at which the pawl will enga e the ratchet and the conse uent extent 0 rotation of the ratchet an platen. A roller F carried by a sprin arm in the usual manner engages the rate et wheel f? to determine exact line space movements.

Fastened to the left hand end of the platen is a head G which has an inwardly extending hollow boss 9' and an outwardly extending hollow boss 9'. This is fastened to the platen by screws 9 and forms a bearirzlg for the left hand end of the platen axle which terminates at this point instead of being extended as usual, and is provided with a rounded end C.

The left hand carriage plate A has a portion bent outwardly and downwardly as at A to form an extended bearing for a spindle H which is coaxial with the platen shaft C and whose inner end enters the hollow boss 9. On the outside of the plate portion A the spindle H is provided with a sleeve H. fastened by a set screw 72 to the spindle, and fast to this sleeve is a finger piece it normally used for "turning the platen. llnside the plate portion A3 a collar h is fastened by a set screw a to the, spindle s0 that the spindle is held against endwise movement but can rotate freely.

aaaaeeo Mounted to turn freely on the inner end of the spindle H is a cup-shaped member K having a hub K fitting said spindle. Said hub has a reduced portion on which is mounted the line space ratchet P so as to turn therewith. The member K surrounds the boss 9 but at a considerable distance therefrom and is provided on its inner wall with a finely serrated or toothed ring portion K. This member K forms one element of a fractional line space mechanism such as shown for. example in Dowd; No. 1,312,024;, August 5, 1919; a

The other element of the fractional line space mechanism ,is in the form of a hub portion L slidingly mounted on the boss g and having three outwardly extending arms Z terminating in serrated portions Z adapted to cooperate with the serrated ring K The member L is mounted to rotate with the platen and is pressed normally into engagement with the ring K by means of pins L secured to the arms Z of the member L which pins pass through openings in the head G and into sockets L of the platen. Springs Z in said sockets bear at one end against the inner ends of the sockets and at the other end against collars Z on the pins L. When the member L is pressed out Wardly into the position shown in Figure 3, the serrations Z on the arms thereof engage the serrations on the ring K and the member K with the line space ratchet wheel f is locked to the platen, so that an 1 actuation of the line space mechanism wil turn the platen.

A disengagement of the two members of the fractional'line space mechanism may be brought about in the following manner. The outer face of thelockingmember L is rovided with an annular undercut recess lid in which is mounted a split ring M tapered to fit the recess. This ring has a projecting tongue M which passes through an open channel in the hollow boss g and througha slot H in the inner tapered end of the spindle H. The spindle H is hollow and slidably mounted therein is a rod N provided with a push button N at its outer end. It also hasa shoulder a working in an enlarged'opening n in the sleeve H and is held against withdrawal by a set screw n Normally the parts are in the position shown in Figurev 3 in which the serrations Z are in engagement with the serrated ring K If the rod N is pushed inwardly it will engage the tongue M and thereby slide the member L into the position shown in Figure 6, in which the connection between the members L and K i entirely broken and the platen may be moved without any .movement of the line space ratchet wheel 7. When the rod is released, the springs Z will return the parts to the Figure 3 position.

neeaeeo and A of the carriage and an arm P has a downwardly extending ear p held in place by the screw 70 which fastens the rod P to the side bar or late A of the carriage.

' The other end of t e arm P is fastened by a screw 70 to the overhanging portion A of the left hand carriage side plate which con-.

nects the portion A with the plate proper A.

When the parts are in normal position as shown in Figure 3 and it is desired to remove the platen, the latch D will be pressed back by the finger piece d so that the engaging end D moves to the position shown in Figure 2, thus clearing the platen axle C. The rod N will then be pushed in to disengage the two clutch elements, and bring the parts to the position shown in Figure 6. The right hand end of the platen may then be lifted slightly, bringing it to the dotted line position of Figure 6, whereupon it may be withdrawn endwise enough to disengage the boss 9 from the spindle H. The rounded end C of the platen axle and the tapered end H of the spindle H will permit this tilting movement. To replace the platen, the left hand end is first placed in position so that the boss g passes over the spindle H which will automatically center the parts, the platen is pushed towards the left, the latch D swung to open position and the platen dropped into place. The spring (P will move the latch to holdin position when released.

t will be evident that l have provided I a platen equipped with fractional line space mechanism which may nevertheless be quickly detached from the platen carriage with no further trouble than the mere release of a single latch. Furthermore the platen may be as readily replaced and is automatically centered in proper position. The platen is held in proper working position and all parts function with their usual ease and accuracy.

Obviously many detailed changes may be made in the arrangement of the parts and the specific construction of the elements without departing in any way from the spirit of the invention, and it is to be understood that the invention is limited only by the scope of the appended claims.

I claim as my invention:

1Q In a typewriting machine, the combination of a detachable platen, a carriage frame, and line space mechanism comprising release devices one portion of which is carried by the platen and the other by the carriage frame, said devices when in release position permitting the removal of the platen and automatically separating upon such removal.

2. In a typewriting machine, the combination of a detachable platen, a carriage frame, line space mechanism comprising release devices one portion of which is carried by the platen and the other by the carriage frame, said devices when in release position permitting the removal of the platen and automatically separating upon such removal, and inter-engaging means on the two portions whereby the platen is automatically centered when replaced in the carriage frame.

3. In a typewriting machine, the combi nation of a detachable platen, means for holding the platen normally in position, and line space mechanism having elements which freely separate to release the platen from the line space mechanism, and when thus separated, permit the free removal of the platen.

4. In a typewriting machine, the combination of a detachable platen, a carriage frame, means for holding the platen normally in position in said frame, and line space mechanism comprising a part mounted on the platen and a part mounted on the carriage frame which freely separates to release the platen from the line space mechanism, and when thus separated, permit the free removal of the platen.

5. In a typewriting machine, the combination of a detachable platen, a carriage frame, a platen axle supported in one end of the carriage frame, a spindle supported in the other end of the carriage frame, line space mechanism comprising a portion carried by the platen and a portion carried by the spindle, said portions separating freely to release the platen from the line space mechanism, and when thus separated, permitting the free removal of the platen, and means for holding the platen in position with the portions of the line space mechanism in operative relation.

(3. In a typewriting machine, the combination of a platen, a platen axle, a carriage frame having side plates, a bearing on the axle beyond one end of the platen, means for supporting the bearing in one side plate, a spindle mounted in the other side plate coaxial with the platen axle, means carried by the platen for detachably engaging said spindle, and a latch forholding the platen in position.

" 7. In a typewriting machine, the combination of a platen, a platen axle, a carria e frame, a bearing in said frame for the ax e beyond one end of the platen, means supported in the other side of the frame and extending inside thereof, mechanism carried by the platen and detachably engaging said means to support the platen at that end, and a latch for holding the platen in position.

8. In a typewriting machine, the combi nation of a platen, a carriage frame, a

platen axle extending in one direction be-c -end, a spindle mounted in the carriage frame coaxial with the platen axle and extending within the carriage frame, means carried by the adjacent end of the platen for detachably engaging said spindle and a latch for holding the platen in position.

10. In a typewriting machine the combination of a platen, a carriage frame, a platen axle extending in one direction beyond the carriage frame and terminating short of the carriage frame at the other end, a spindle mounted in the carriage frame coaxial with the platen axle and extending within the carriage frame, a hollow boss portion curved to swing neeaeeo carried by the adjacent end of the platen for fitting over' the end of the spindle, said boss and spindle separating to permit removal of the platen and a latch for holding the platen in position.-

11. In a typewriting machine, a carriage frame, a detachable. platen, line space mechanism including platen release devices and having a portion carried by the frame,

and'a bracket-carried by the carriage frame and furnishing additional support for said portion of the line space mechanism when the platen is detached. F

12. In a typewriting machine, a carriage frame, a detachable platen, and a latch for holding the platen in operative position in operative position comprising a hook reely into and out of engaging position, a tail portion for limitingthe swing in one direction, an 0&- set arm for guiding the latch and limiting the swing in the other direction and a spring normally tending to move the latch 4 ,to holding position.

In testimony whereof, I have hereunto subscribed my name.

LEWIS C. MYERS.

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