US1236650A - Type-writing machine. - Google Patents

Description

N. H. ANDERSON.

"TYPE WRITING MACHINE. APPLICATION FILED JUNE 12, I914.

1,236,65. Patented Aug. 14, 1917.

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N. H. ANDERSON. TYPE WRITING MACHINE. APPLICATION man JUNE 12', 1914.

1,236,650. Patented Aug. 11, 1917.

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Mrs H. ANDERSON, or MIDDLETOWN, CONNECTICUT, AssIGNon to THE NoIsnLEss rvrnwnrrnn COMPANY, or MIDDLETOWN, CONNECTICUT, A CORPORATION or CONNECTICUT.

Application filed June 12, 1914.

To all whom it may concern:

Be it known that I, Nrns H. ANDERSON, a citizen of the United States, residing at Middletown, in the county of MiddleseX and State of Connecticut, have invented certain new and useful Improvements in Type-Writing Machines, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to typewriting machines, and with regard to certain more specific features thereof, to the escapement mechanism and associated parts.

One of the objects of the present invention is to provide a simple and practical escapement mechanism. Another object is to provide an escapement mechanism which will be efiicient and reliable in use and operation. A further object is to provide an escapement mechanism which may be independently operated from the type actions or space bar. A further object is to provide an escapement mechanism of the first abovementionecl character which will permit writing at a high rate of speed and with a minimum amount of noise. Other objects will be in part obvious and in part pointed out hereinafter.

The invention accordingly consists in the features of construction, combinations of elements and arrangement of parts which will be exemplified in the construction hereinafter set forth, and the scope of the application of which will be indicated in the following claims.

In the accompanying drawings, wherein is shown one of various possible embodiments of this invention,

Figure 1 is a plan view of a portion of a typewriting machine showing the escapement mechanism and some of the associated parts applied thereto;

Fig. 2 is a side elevation of the same;

Fig. 3 is a detail plan view of a portion of the escapement mechanism;

Fig. l is a diagrammatic view of theparts shown in Fig. 3; and

Figs. 5 and 6 are detail views.

S m r refere ce chara e s refer to im Specification of Letters Patent.

TYPE-WRITING MACHINE.

Patented Au 14, 1917.

Serial No. 844,654.

lar parts throughout the different views of the drawings.

The present invention will be hereinafter described with relation to its application to the Noiseless Typewriting Machine, although it is of course to be understood that the escapement is applicable to other forms of machines without departing from the scope of the invention.

In the accompanying drawings the escapement is shown free from the other mechanisms common to a typewriting machine for the sake of clearness, and it may be stated briefly that this escapement mechanism is adapted to be actuated at each operation of any type action or the space bar to feedthe carriage with which it is con neeted one letter space in a letter feed direction.

Referring now in detail to these drawings, and more particularly to Figs. 1 and 2, 1 denotes an escapement shaft which is vertically disposed in the rear of the machine, its lower end being supported in trunnions 2 carried by an escapement bracket 3 secured to the frame of the machine. The object in mounting the escapement shaft in trunnions in this manner is to permit of an adjustment of the carriage fore and aft of the machine, according to the number of sheets carried thereby, in order that the outer sheet may be properly positioned with respect to the end of the path of travel of the type carriers. Immediately above the trunnions is positioned an escapement wheel 4 which is keyed to the shaft in any desired manner, as by means of a set screw This escapement wheel has an upwardly eX- tending portion or hub which is provided, near its upper end, with a grooved portion or ring 6 adapted to support and control a plurality of radially movable teeth 7. These teeth have offset ends 8 and are mounted in radially disposed grooves both in the escapement wheel and the grooved ring and are held in place by means of a ring 9 passing around the grooved portion and engaging all of the teeth. The teeth are maintained in their normal or inactive outward position by means of a coil spring 10 engaging notches in their upper ends and act-.

ing on the teeth in such a manner as to urge their lower ends outward in a position to be engaged by a silencing stop or do 11 mounted slightly above in the rear 0 the escapement wheel.

At this point it may be briefly noted that, in operation, the teeth 7 are tripped successively'out of engagement with the silencing dog 11' by tripping mechanism which will be hereinafter more fully described.

When the carriage is returned to linecommencing position a reverse movement is, of course, given the escapement wheel, and the teeth, during this reverse movement, move inwardly in passing the dog, being returned to normal position immediately thereafter by the action of the coil spring 10 engaging their upper ends. The dog 11, which limits rotation of the escapement wheel, and is thus a holding dog, may also, for convenience, be called a silencing dog, for the reason that it silently arrests the movement of the escapement wheel when feeding the carriage in a letter space direction, and further, for the reason that it is neither a fixed dog nor a movable dog in the sense in which these terms are generally used in this art.

As shown more clearly in Fig. 3, this holding or silencing dog, which is composed of two parts, is pivotally mounted at 12 on a bracket or support 13 secured to the escapement bracket 3. The movement of the dog about its pivot is controlled by the action of a bell crank lever 14 pivotally mounted at 15 to one side of the dog upon the bracket 13, and having its long arm 16 connected at one end to the dog by means of a short link 17. When normally engaging the teeth of the escapement wheel the parts are substantially in the position as shown in Fig. 3, but when a tooth is tripped out of engage ment with the silencing dog the bell crank 14 is rotated by the action of a spring 18 connected to the outer end of its short arm 20, which causes the dog 11 to pass forward a slight amount ready for engagement with the neXt succeeding tooth of the escapement wheel. It will be noted, however, that this distance is very slight, which permits the tooth of the escapement wheel to move freely and rapidly through a relatively large por tion of its path of travel, yet it is suflicient to silently arrest the movement of the escapement wheel by means of the peculiar toggle construction composed of the bell crank lever 14, the connecting link 17 and the member 21 forming part of the dog 11. By referring to the diagram in Fig. 4-, which shows the parts in their active position, this toggle construction will be clear. The

. amount which the bell crank lever 14 is permitted to swing is controlled by an adjustable stop pin 22 mounted upon the bracket 13 against which the short arm 20 is brought to rest under the action of the coil spring 18. The tension of this spring may also be controlled by an adjustable automatic lock nut 23 engaging a threaded member 2 1 to which the spring 18 is connected after passing through an ear 25 on the bracket supporting the silencing dog.

It will be noted that the dog itself is a separate and independent member mounted in slots at the end of the link 21, pivoted at its opposite end 12 to the bracket. This construction permits the dog 11 to be moved rearward when the lug 26 is engaged by a member 27 connected with the tabulating mechanism to allow the escapement wheel to run free. The dog is normally held in outward position by an. expansion spring 28, as shown in Fig. 5. v

The tripping mechanism is shown more clearly in Figs. 1 and 2 and comprises a bracket 30 attached to the frame of the machine and carrying two pawls, one of which, 31, is adapted to trip the escapement from the key action through the universal bar mechanism, and the other, 32,.to trip the escapement from the space bar mechanism. The pawl 32 is mounted at the upper end of an arm 33 carried by a shaft 34 adjustably trunnioned in the bracket 30, while the pawl 31 is carried by a similar arm 35 on a shaft 36 also pivotally mounted on the bracket 30. The pawl 31 is shown in detail in Fig. 6 in retracted position, and, it will be noted, is held in normal raised positionby means of the coil spring 37 connecting its rear end with a lug 38 on the lower end of the arm 35 on which it is mounted. This spring, however, is sufliciently resilient to permit the pawl to be easily moved into inactive position before tripping the-escapement tooth,

or when moving to position shown in Fig. 6.

The pawl 31 is connected to the universal bar mechanism by means of an arm 40 mounted on the outer end of the shaft 36, through which connection is made to a universal bar rock shaft 41 by means of an adjustable pull wire 42 and an arm 43 keyed to the shaft. When the universal bar is actuated the shaft 11 rotates in the direction indicated by the arrow and causes the pawl 31- to pass under the tooth of the escapement wheel, and on its return movement to normal position disengages the tooth 7 from the silencing dog 11, allowing the wheel to rotate to bring the next tooth into position. The pawl and associated parts are returned to normal position by means of a universal bar spring 4 1 connected to an arm 415 011 shaft 36. It will be noted that the pawl 31 normally stands in front of the tooth of the escapement wheel and slightly to one side thereof, as shown clearly in Fig. 1, and when actuated passes behind the tooth and then forward again to engage the offset end 8 of the tooth and move the teeth i a d fir the silencing dog. This peculiar action is especially desirable in a universal bar mechanism, in which the movement which actuates the escapement is made after the key lever has been brought to rest and the escapement tripped independently of the holding down of the key lever by the operator, as is done in the Noiseless machine. In other words, it is particularly applicable to an escapement mechanism which is. tripped simultaneously with or efiectively after the printing moment.

The space bar mechanism trips the escapement by means of the pawl 32 and its operation is substantially the reverse to that above described in connection with the pawl 31. That is, the pawl 32 occupies a normal position immediately behind the tooth 7 of the escapement wheel and acts thereon to disengage the tooth from the silencing dog 11 during the downward movement of a space bar 46, which operates to rotate the rock shaft 3st and arm 33 toward the front of the machine through the space bar rock shaft 17, pull wire 48 and arm 50 on shaft 341, the parts being returned by spring 51 on rock shaft 47. Under this condition the pawl will trip the tooth 7 out of engagement with the silencing dog 11 and permit the next succeeding tooth of the escapement wheel to move into engagement therewith. The pawl returns to its normal position after said operation has taken place. Should this return movement of the-dog occur under abnormal conditions, as while the escapement wheel is rotating, it is desirable to offset the lower end of each tooth of the escapement wheel whereby it will be engaged by the pawl, since this will allow a correct return movement of the pawl without interference. A spring 52 similar to sprin 37 permits such movement and assures a proper return and holding in normal position.

It will thus be seen that, in this particular form of escapement mechanism, separately and independently acting means having effective movements in opposite directions are provided for tripping the escapement according to whether the space bar is actuated or one of the type actions. The actuating pawls, being pivotally mounted and resiliently held in normal position, are permitted to return to such position after each actuation in a rapid and silent manner.

It is thought that the operation of this device will be clear from the above description. It may, however, be briefly stated as follows: Assuming the parts to be in position as shown in Figs. 1 and 2, whenever a type action is operated it will, in a Noiseless machine, operate the universal bar rock shaft 41 at substantially the end of the path of travel of the type carrier. Motion is transmitted from the shaft through the arm and adjustable pull wire 4:2 to the rock shaft 36 carrying the tripping pawl 31. This pawl moves first rearward and on its return engages the adjacent tooth 7 of the escapement wheel and moves its lower end inward out of the path of travel of the silencing dog 11 before it slips out of engagement therewith. As soon, however, as the tooth of the escapement wheel is tripped, the parts of the silencing dog will move into the position shown diagrammatically in Fig. 1; that is, flexing the toggle construction shown. The escapement wheel is rotated under the action of the spring drum drive mechanism common to many forms of commercial machines and causes the succeeding tooth of the escapement wheel to move into contact with the silencing dog. As it moves into engagement it will carry the same back to normal position, as shown in Fig. 3, and move the toggles comprising the silencing mechanism into extended or straightened position, at the same time tensioning the actuating spring 18. This movement will, of course, silently arrest the movement of the escapement wheel, but as the distance through which the tooth of the escapement wheel travels after coacting with the silencing dog is so very slight, there will not be a perceptible retardation of the effective operation of the escapement mechanism.

When the space bar mechanism is actuated, motion is transmitted through the space bar rock shaft 17 the arm mounted thereon and adjustable pull wire 48 to the other pawl 32, which operates to trip the teeth of the escapement wheel directly or in a manner reverse to that of the tripping pawl. The general result, however, is the same in both cases, for the escapement wheel is permitted to rotate one letter space movement at each tripping.

It is thus seen that this invention provides a simple and practical escapement mechanism which is eflicient and reliable in operation and in use and is believed to accomplish, among others, all of the objects and advantages above set forth.

As many changes could be made in the above construction and many apparently widely different embodiments of this invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

Having described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In escapement mechanism, in combination, an escapement rack, and means to effect a step-by-step feed thereof and to silently arrest the same during the final portion of each feed step whereby the initial portion of each feed step is free. said means including a movable holding dog positioned for engagement by a tooth of said rack at a point closely adjacent the termination of a feed step movement of the latter.

2. In escapement mechanism, in combination, a rotatable escapement wheel, and means to effect a step-by-step rotative feed thereof and to silently arrest the same dur ing a relatively short final portion of each feed step whereby the rotative movement thereof is unrestricted during a relatively long initial portion of each feed step, said means including a movable holding dog positioned for engagement by a tooth of said 'ack at a point closely adjacent the termination of a feed step movement of the latter.

. 3. In escapement mechanism, in combination, an escapement wheel having relatively movable teeth, and common means normally urging all of said teeth to normal position.

4:. In escapement mechanism, in combination, a rotatable escapement wheel, a plurality of teeth pivoted thereon and having their free extremities movable radially with respect thereto, and a common spring acting upon all of said teeth and urging the eX tremities thereof outward.

5. In escapement mechanism, in combination, an escapement wheel having radially disposed teeth, resilient means holding said teeth in normal outward position, means to move said teeth inward, and a movable holding dog to coact with the teeth of the escapement wheel.

6. In escapement mechanism, in combination, an escapement wheel having radially disposed teeth, resilient means holding said teeth in normal outward position, means to move said teeth inward, a movable holding dog, and means associated with said dog to silently arrest its movement and the move ment of the escapement wheel.

7. In escapement mechanism, in combination, a rotatable escapement wheel having an elongated hub, a plurality of elongated teeth pivotally mounted on said hub and disposed substantially in the direction thereof, the free ends of said teeth being movable radially toward the center of said wheel, a dog holding said escapement wheel in normal position, and means to trip said teeth.

8. In escapement mechanism, in combination, an escapement wheel having movable teeth, a holding dog for retaining the wheel in normal position, a tripping dog, and a toggle mechanism associated with the holding dog for silently arresting its movement and the movement of the escapement wheel.

9. In escapement mechanism, in combination, an escapement wheel having movable teeth, a holding dog, a tripping dog, and a toggle associated with said holdmg dog adapted to be flexed after the escapement wheel is tripped.

10. In escapement mechanism, in combination, an escapement wheel having movable teeth, a holding dog coacting therewith, means for tripping the escapement teeth, and a toggle mechanism associated with the movable holding dog.

11. In escapement mechanism, in combination, an escapement wheel having movable teeth, a holding dog coacting therewith, means for tripping the escapement teeth, and a toggle mechanism associated with the holding dog adapted to move to flexed position after the teeth of the escapement wheel have been tripped.

12. In an escapement mechanism, in combination, an escapement wheel having movable teeth, a holding dog coacting therewith, means for tripping the escapement wheel, toggle mechanism associated with the holding dog and movable to flexed position after the teeth of the escapement wheel have been tripped, and resilient means associated with said toggle mechanism for silently arresting its return to normal position.

13. In escapement mechanism, in combination, an escapement bracket, an escapement wheel trunnioned therein, a plurality of radially disposed teeth mounted in the escapement wheel, a holding dog, and a trip ping dog.

14. In escapement mechanism, in combination, an escapement bracket, an escapement wheel trunnioned therein, a plurality of radially disposed teeth mounted in the escapement wheel, asilencing dog, and a pair of tripping dogs one of which is adapted to trip the teeth of the, escapement wheel on its forward movement and the other on its return movement. 7 e

15. In escapement mechanism, in combination, an escapement bracket, an escapement wheel trunnioned therein, a plurality of radially disposed teeth mounted in the escapement wheel, a silencing dog, and a pair of tripping dogs one of which is con nectedwith the universal bar and the other of which is connected with the space bar mechanism.

16. In escapement mechanism, in combination, an escapement wheel having movable teeth, a holding dog, and a tripping mechanism, said tripping mechanism comprising a pair of movable dogs, one of which is adapted to act on its forward fmovement and the other on its return movement.

17. In escapement mechanism, in combination, an escapement wheel having movable teeth, a holding dog, and a tripping 1nechanism,'said tripping mechanism comprising a pair of resiliently held tripping dogs, one of which .is connected. with the universal bar mechanism. and the other with the space bar mechanism.

18. In escapement mechanism, in combination, an escapement wheel having movable teeth, a holding dog, and a tripping mechanism, said tripping mechanism comprising a pair of movable dogs having their effective movements in opposite directions.

19. In escapement mechanism, in combination, an escapement wheel having movable teeth, a holding dog, and a tripping mechanism, said tripping mechanism comprising a pair of vertically disposed movable dogs and spring means holding said dogs in normal position and permitting them to move out of the path of travel of the teeth of the escapement wheel.

20. In escapement mechanism, in combination, an escapement Wheel having movable teeth, a holding dog, and a tripping mechanism, said tripping mechanism comprising a bracket, independent shafts mounted in said bracket and tripping dogs mounted on said shafts.

21. In escapement mechanism, in combination, an escapement wheel having movable teeth, a holding dog, and a tripping mechanism, said tripping mechanism com prising a bracket, independent shafts mounted in said bracket and tripping dogs mounted on said shafts, one of said dogs being adjnstably connected with the universal bar mechanism and the other of said dogs being connected with the space bar mechanism.

22. In escapement mechanism, in combination, an escapement wheel having movable teeth, a holding dog, and a tripping mechanism, said tripping mechanism com prising a bracket, independent shafts mounted in said bracket and tripping dogs mounted on said shafts, one of said dogs being adjustably connected with the universal bar mechanism and the other of said dogs being connected with the space bar mechanism and having their effective movements in opposite directions.

23. In escapement mechanism, in combination, an escapement wheel having substantially radially movable teeth, a movable holding dog coacting therewith, and a trip ping means associated with said parts, said movable holding dog having an independent fore and aft movement to permit a free rotation of the escapement wheel.

24. In escapement mechanism, in combination, an escapement wheel having substantially radially movable teeth, a movable holding dog coacting therewith, and a tripping means associated with said parts, said movable holding dog being pivoted at its rear end and a toggle associated therewith to limit its return movement.

25. In escapement mechanism, in combination, an escapement wheel, a holding dog coacting therewith, and a reverse toggle associated with said holding dog adapted to limit and to silently arrest the movement of the escapement wheel.

26. In escapement mechanism, in combination, an escapement wheel, and a movable dog associated there *ith for silently arresting the movement of the escapement wheel, and a toggle to limit and silently arrest movement of the escapement wheel, said toggle comprising a bell crank lever, a spring connected with one arm and a link connecting the other arm with the movable dog.

27. In escapement mechanism, in combination, an escapement wheel, and a movable dog associated therewith for silently arresting the movement of the escapement wheel, and a toggle to limit and silently arrest movement of the escapement wheel, said toggle comprising a bell crank lever, a spring connected with one arm and a link connecting the other arm with the movable dog, one arm of said bell crank lever and said link forming a reversed toggle.

28. In escapement mechanism, in combination, an escapement wheel, movable teeth, tripping means, a holding dog to move forward after the escapement wheel is tripped for engagement by the next tooth, a bell crank lever, and a spring connected with said holding dog adapted to bring the parts to rest without impact or concussion.

29. In escapement mechanism, in combination, an escapement wheel having movable teeth, tripping mechanism, and holding mechanism, said holding mechanism comprising a pivotally mounted dog having an independent fore and aft movement.

30. In escapement mechanism, in combination, an escapement wheel. having movable teeth, tripping mechanism, and holding mechanism, said holding mechanism comprising a twopart pivotally mounted dog, a bell crank lever and a link between one arm of said bell crank lever and one of the parts of said dog.

31. In escapement mechanism, in combination, an escapement wheel having movable teeth, tripping mechanism, and holding mechanism, said holding mechanism com' prising a pivotally mounted dog and a bell crank lever toggle mechanism associated therewith to move the dog forward after the tripping mechanism has been operated.

32. In escapement mechanism, in combination, an escapement bracket, an escapement wheel mounted therein having substantially radially movable teeth, a movable holding dog, and tripping mechanism comprising a pair of resiliently held tripping pawls connected with the space bar and universal bar mechanism, respectively, said holding dog having means associated therewith to urge it silently forward after the escapement wheel has been tripped.

38. In escapement mechanism, in combination, an escapement bracket, an escapement wheel mounted therein having substantially radially movable teeth, a movable NILS H. ANDERSON.

holding dog, and tripping mechanism comprising a, pair of resiliently held tripping pawls connected with the space bar and universal bar mechanisms, respectively, said holding dog having means associated therewith to urge it silently forward after the escapement wheel has been tripped, and a reversed toggle bell crank mechanism for Witnesses:

FRANCIS A. BEACH, EDWARD A. WILCOX.

Copies of this patent may be obtained for five, cents each, by addressing the Commissioner of Patents, Washington, D. 0.

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