US1011720A - Type-writing machine. - Google Patents

Description

G. J. BARRETT.

TYPE WRITING MACHINE. APPLIc IoN FILED MAR.11, 1911.

Patented Dec. 12, '1911.

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1||5 ATTEIRNEY G. J. BARRETT.

TYPE WRITING MACHINE.

APPLICATION FILED MAR. 11, 1911.

Patented Dec. 12, 1911.

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WITNESSES:

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COLUMBIA PLANOGRAPH co., WASHINGTON. n. 5'.

G. J. BARRETT. TYPE WRITING MACHINE.

APPLICATION FILED [A111, 1911.

1,0]. 1,720. I Patented Dec. 12, 1911.

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fiiTDRNEY 1 v COLUMBIA C0-, DAL

UNITED STATES PATENT OFFICE.

GLENN J. BARRETT, OF GRAND RAPIDS, MICHIGAN, ASSIGNOR TO UNION TYPEWRITER COMPANY, or ILION, NEW YORK,

A CORPORATION OF NEW YORK.

TYPE-WRITING MACHINE.

and State of Michigan, have invented cer-' tain new and useful Improvements in Type- Vriting Machines, of which the following.

is a specification.

My invention relates to typewriting machines and more particularly to carriage escapement mechanism.

escapements are known as ordinary escapements as distinguished from reverse escapements, the extent that the dog passes through or into the teeth of the escapement rack or wheel, depends somewhat upon the extent to which the key is depressed. There is often a lost travel of the dogs through or into the teeth of the wheel and it is necessary to take up this lost travel of the dogs on the return stroke of the key before the carriage can be let ofi' which results in an irregular acting and comparatively slow escapement.

The main object of my invention, generally stated, is to overcome the disadvantages usually found in such escapements as those referred to above and to provide a rapid, reliable, positively acting and efficient escapement which is uniform in its action under different conditions of key stroke and in which a let-off of the carriage is effected early in the upstroke of a depressed key, whether the ke Y be depressed to the full ex tent or only partly depressed.

To the above and other ends which will hereinafter appear, my invention consists in the features of construction, arrangements of parts and combinations of devices to be hereinafter described and particularly pointed out in the appended claims.

In the accompanying drawings, wherein like reference characters indicate corresponding parts in the various views, Figure -1 is a vertical central fore and aft sectional view of one form of typewriting machine embodying my inventlon; only a suflicient Specification of Letters Patent.

Application filed March 11,

Patented Dec. 12, 1911.

1911. Serial No. 613,779.

number of parts of the machine being shown to illustrate my invention in its embodiment therein. Fig. 2 is a fragmentary rear elevation, with parts in section, of a portion of the escapement mechanism. Fig. 3 is a top plan view of the same with some of the parts omitted and some of the parts in section. Figs. 4, 5 and 6 are fragmentary detail side elevations, with parts sectioned away, of a portion of the escapement mechaparts disposed as they appear at different parts of the operation of the key.

While my invention is capable of being embodied in various forms of typewriting machines I have illustrated it in the present instance in a machine of the front-strike variety somewhat similar to the No. 10 Remington machine, although some of the parts are merely conventionally represented in the drawings.

In my present construction I provide means for automatically effecting a momentary disconnection between parts of the intermediate actuating devices between the keys and the key controlled escapement member and provide adjustablemeans for regulating the point in the operation of the key when such disconnection shall be effected or to throw the automatically opernism, the different views illustrating the Ordinarily in that class of escapements in which the let-off of the carriage is effected at the upstroke of the key and which 1 carries a platen 7 with which upwardly and rearwardly striking type bars 8 cooperate. The type bars are segmentally arranged and are mounted upon the type bar segment 9.

Each type bar is actuated by links 10 and 11, an intermediate sub-lever 12. and akey lever 13, the last provided with a finger key 14 and a returning spring 15.

Any suitable escapement rack and cooperating feed dogs can be employed, so far as my invention is concerned. As here shown, the carriage is provided with rearwardly extending arms 16 pivoted thereto at 17 and connected at their rear ends to a feed rack 18. This feed rack meshes with a pinion 19 fixed to the forward end of a shaft 20 which turns in a bearing 21 secured to the top plate of the machine. An escapement rack or wheel 22 is fixed to the rear end of the shaft 20 and is provided with teeth 23 having their reverse faces 24 beveled for purposes which will hereinafter more clearly appear. A dog rocker 25 has a shaft 26 mounted to turn on pivot screws 27 held in tapped openings in lugs 28 which project from a bracket plate 29 secured to the frame of the machine. The upwardly extending dog carrying arm of the rocker or dog carrier has formed thereon a fixed dog 30 provided with a flat working face with which the teeth of the escapement wheel cooperate. A dog 31 is pivoted upon a shouldered pivot screw 32 connected to the upwardly extending arm of the dog rocker, the axis of the pivot 32 being parallel with the pivotal axis of the dog rocker. The dog 31 is thus fixed against movement in the direction of movement of the escapement wheel but is adapted to turn around the axis of the pivot 32 in a plane at substantially right angles to the plane of the escapement wheel. A contractile spring 33 is connected at one end to a laterally projecting pin 34 on the dog rocker and at its opposite end to a pin 35 which projects laterally from the dog 31, The pull of this spring is exerted to draw the dog 31 toward the dog 30 and to maintain the dog 31 normally in the position shown in Fig. 4, for example where it is arrested by a shoulder of the fixed dog. The dog rocker is provided with a substantially horizontally disposed forwardly extending arm 36 which, according to my present in vention, is formed with a step, shoulder or notch 37 and with a second step, notch or shoulder 38 formed by the bottom wall of a slot 39. A key controlled actuating member 40 coiiperates with the rocker arm 36 to actuate the dog rocker and control it from the keys in its movements from and back to normal position. In the present instance this actuating member 1s in the nature of a two-part link the two parts being adjustably connected at 41. The lower end of the two-part link is pivoted at 42 to a rearwardly extending arm 43 projecting from a universal bar 44 which extends beneath the series of key levers for actuation thereby. The universal bar is supported by arms 45 which extend rearwardly from a rock shaft 46 pivoted in the base of the machine. The Y actuating link 40 is connected by a contractile spring 47 to the arm 36 of the dog rocker, one end of the spring being connected to a pin 48 on the link and the other end of the spring being connected to a pin 49 on the dog rocker. This spring stands at an inclination upward and toward the rear and the pull of it is exerted to normally maintain the actuating link positioned as indicated in Fig. 1 with reference to the dog rocker. The upper end of the link 40 is formed into a yoke 50 which embraces the arm 36 of the dog rocker near the free end thereof. The upward movement of the link 40 relatively to the dog rocker is limited by a pin 51 carried by the link 40, said pin contacting with the lower edge of the rocker arm 36, as shown in Fig. 1. An antifriction roller 52 is pivoted upon a pin 53 which extends between the side arms of the yoke 50 and constitutes an abutment cooperative with the steps, shoulders or notches 37 and 38 on the rocker arm 36, as indicated in Figs. 4 and 5, respectively. It will be understood therefore that the relative movement between the link 40 and the rocker arm 36 in one direction is limited by the pin 51, whereas the roller 52 in its cooperation with the lower wall 38 of the notch 39 in the rocker arm limits the relative movement between the link 40 and the rocker arm in the opposite direction.

An abutment which in the present instance is in the nature of a cam plate 54, is interposed in the path of movement of the anti-friction roller 52. This cam plate is preferably loosely supported on the rocker shaft 26 to turn on said shaft as a center and is adjustably held in place by a headed binding screw 55 which extends through a slot 56 in the cam plate and is received at its threaded end in a tapped opening in a projection 57 on the bracket plate 29. The slot 56 is in the nature of an arc of which the axis of the dog rocker shaft 26 is the center. An up and down adjustment of the cam plate may therefore be effected around the shaft 26 of the dog rocker as a center. The cam plate has an inclined face 58 at the forward free end thereof which constitutes a contact surface with which the antifriction roller 52 is adapted to contact during the downward movement of the link 40. The efiect of the engagement of the antifriction roller with the cam face 58 is to displace the roller from the step, shoulder or notch 37 during the down stroke of the finger key; the camming off of the roller from the step 37 turning the link 40 around its pivotal connection 42 with the universal bar and against the pull of the spring 47. When the actuating member or link 40 is thus displaced to disconnect it from the step 37 and connect it with the step 38 of the dog rocker, the severance of the positive connec-- tion between the actuating link and the dog rocker 1s but a momentary one and such disconnectlon and reestablishment of a positive connection between the actuating link and dog rocker is effected at the down stroke of the printing key. It will be understood therefore that while the momentary disconnection specified between these parts is effected the dog rocker is never wholly out of control of the finger keys and the finger keys control the dog rocker in its movement back to normal position as will presently appear.

A contractile spring 59 is connected at one end to a pin 60 which projects downwardly from the shaft 26 of the do rocker, the opposite end of this spring lieing connected to a downwardly projecting pin 61 fixed to the bracket plate 29. The pull of this spring is exerted to turn the rock shaft 26 so as to move the upright arm of the dog rocker rearwardly to the position shown in Fig. 1. The movement of the dog rocker in this direction is limited by a screw stop 62 received in a tapped opening in an off-set projection 63 on the arm 36 of the dog rocker (see Fig. 2) said screw being adapted to bear at its upper end against a stop 64 formed on the bracket plate 29 (see Figs. 1, 2 and It will be understood that an adjustment of the abutment or cam plate 54 to different set positions determines the point in the downward movement or dip of a finger key when the actuating link 40 is automatically disconnected from the stepped face 37 of the rocker arm. When, however, the cam plate is adjusted to its lowermost position the inclined face 58 is maintained in such position that the roller 52 will not be brought into contact therewith during the depression of a key, so that the automatically operating means for effecting a disconnection between the link 40 and the dog rocker is thrown out of operation. When such an adjustment of the cam plate 54 is provided a comparatively slow escapement results in which there is no compensation for the lost pull of the dogs through the escapement wheel. However, other adjustments of the cam plate, to provide an automatic momentary disconnection of the positive engagement between the actuating link 40 and the rocker arm are effective to provide a comparatively rapid escapement in which compensation is made for any lost pull of the feed dogs through the escapement wheel or rack and a quick let off of the carriage is afforded at the first portion of the upstroke of the key. This quick let ofi is afforded irrespective of the character of key touch, 2'. 6., whether a comparatively short, quick dip of the key is effected, or the operators touch is of a character which provides a long, following stroke on the key; pressure being maintained thereon by the operator until the key reaches the limit of its downward movement.

In the operation of the machine it may be assumed that the cam plate 54 has previously been adjusted to the central position shown in the drawings and is fixed in such position by the binding screw 55. A depression of a finger key is effective to move the associated type bar to the printing position. During the key depression the universal bar is taken up and a downward movement of the link 40 is efiected. The first part of the downward movement of the link 40 from the position shown in Fig. v1 is in the nature of a lost motion, such motion continuing until the roller 52 is brought into engagement with the step or shoulder 37 on the dog rocker. A further downward movement of the link 40 is effective to turn the dog rocker, through a positive connection, on its pivotal axis and to move it from the position shown in Fig. 1 to that represented in Fig. 4. This movement of the dog rocker carries the dog 31 out of engagement with the previously engaged tooth of the escapement wheel and brings the dog 30 into engagement with the same tooth with out appreciably advancing the escapement wheel, although there is a slight drop between the working faces of the two dogs as .indicated in Fig. 2. This movement of the link 40 with the dog rocker is effective to bring the roller 52 into cotiperation with the cam face 58 and a further downward movement of the key is effective to displace the roller 52 from the step 37, by camming the upper end of the link forwardly. At the instant of displacement of the roller 52 from the step or shoulder 37 the dog 30 has been pulled through the escapement wheel by a lost pull or travel to bring, say, the vertical center of the dog 30 into engagement with the tooth of the escapement wheel. The disconnection of the dog rocker from the link by camming off the roller 52 from the shoulder 37 enables the dog rocker to receive a slight retrograde or return movement under the pull of its returning spring 59; the power of the spring 59 being greater than the power of the spring 47 so that the spring 47 is stretched at this time. The retrograde movement of the dog rocker, thus automatically effected, continues until the shoulder or stepped face 38 on the dog rocker cooperates with the roller 52, as indicated in Fig. 5. The retrograde movement of the dog rocker just described will carry the dog 30 back to a position such as that represented in Fig. 5 where a further slight retrograde or backward movement of the dog rocker is effective to bring the inner edge of the dog 31 into contact with the engaged tooth of the ecapement wheel. In no instance, however, is this retrograde movement or back lash of'the dog rocker sufficient to produce a complete return movement of the dog rocker to normal position,

and in no instance is the automatically effected back lash of the dog rocker sufficient to afford a let ofi of the carriage. The movements of the parts to the positions indicated in Fig. 5 are effected at about the time of a complete depression of the finger key. As soon as power is released on the depressed key the pull of the spring 59 is effective to return the dog rocker and the actuating link 40 together, and a slight return movement of the parts from the position in Fig. 5 is effective to bring the inner edge of the dog 31 into engagement with the engaged tooth of the escapement wheel, thus holding the dog 31 against the pressure of the spring 33 while the dog 30 continues its movement with the dog rocker. This is effective to separate the dogs 30 and 31, to afford a let off or advance movement of the escapement wheel and as soon as the engaged tooth of the wheel passes through the space between the two dogs, the dog 31 is forced by the pressure of its spring 33 into the path of the next oncoming tooth of the escapement wheel to arrest it, as shown in Fig 6. It will be seen that this return movement of the dog rocker and actuating link 40 is effected while the roller 52 is maintained seated in the lower end of the notch 39, as indicated in Fig. 6, so that the dog rocker at this time is under control of the key. It will be understood therefore that a slight return movement of the finger key is effective to afford a quick let off of the carriage. In the present instance it may be assumed, under the adjustment of the cam 54 shown in the drawings, that this let-off will take place when the type bar has returned from the platen to the dotted line position shown in Fig. 1. When the cam is adjusted to its lowermost position the roller 52 will be maintained in engagement with the shoulder 37 of the dog rocker during both the down and upstroke of a finger key, and this affords a relatively slow operation of the escapement because no compensation is provided for the lost travel of the fixed dog 30 through the escapement wheel and the carriage cannot be let off until this lost travel is taken up by the return movement of the finger key. This may be assumed to be, for example, at a point when the type bar returns, say, about one-half its travel from the platen back to normal position.

It will be understood that although a moin entary severance of the positive connection is effected between the actuating link 40 and the dog rocker at one point in the down stroke of a finger key, the positive connection is reestablished before the key completes its down stroke and the dog rocker is under control of each finger key at the upstroke thereof as well as at the down stroke; the rocker being moved in one direction at a down stroke and in the opposite direction at the upstroke of a finger key and in both instances under control of the key. By maintaining control of the key controlled escapement member by the keys and yet affording a temporary severance of the positive connection between them, and affording a limited independent movement between said escapement member and the keys in the manner described, I am enabled to provide a more positively acting and reliable escapement than one in which the re turn movement of the key controlled escape ment member is efiected independently of or out of control of the key. Moreover, the escapement of my invention responds more accurately to different conditions of touch or key stroke employed by different operators and responds equally well to operators having a short, sharp stroke as it does to operators having a long, following stroke. It will also be understood that a complete movement of the dog rocker in one direction sufficient to disengage, the dog 31 and bring the dog 30 into engagement with the escapement wheel is effected while the actuating link is connected to the dog rocker at one point as at the shoulder 37 whereas the return movement of the dog rocker to disengage the dog 30 and bring the dog 31 into the path of the next oncoming tooth of the escapement wheel is effected during the return movement of the dog rocker and while the actuating link &0 is connected to the dog rocker at another point, as at 38. When the dog rocker has completed its return movement and has been arrested by the cooperation of the stops 62 and 6 1, the spring 17 is effective to restore the normal relation between the actuating link and the dog rocker as indicated in Fig. 1.

It will be understood that the cam plate 54 constitutes an abutment which may be maintained in the path of the key controlled actuating member or link 10 to automatically effect a displacement of the link relatively to the dog rocker during the down stroke of the key; and that the normal relation between these parts is automatically reestablished at the completion of the upstroke of the key.

The beveled faces 24 on the rear sides of the teeth of the escapement wheel cooperate with the corresponding bevel on the dog 31, so that a reverse movement of the escape ment wheel, effected during the movement of the carriage from left to right, is effective to cam the dog 31 against the pull of the spring 33 so that the dog 31 does not constitute an obstruction to the reverse movement of the escapement wheel.

That feature of the present invention which relates to the automatically operating means for affording a retrograde or return movement of the dog rocker during the depression of a key is claimed generically herein. However, in a companion application filed by me of even date herewith and bearing Serial No. 613,77 8 I have included generic claims which cover the present construction but an automatic retrograde movement, such as is mentioned above, is not effected in the construction described in said companion application. In another companion application filed by me of even date herewith and bearing Serial No. 613,780 is disclosed 'another form of construction in which the retrograde movement spoken of above is embodied but the claims in that case are limited to features not disclosed herein.

Various changes may be made without departing from the spirit and scope of my invention.

What I claim as new and desire to secure by Letters Patent, is

1. In a typewriting machine, the comblnation of a power driven carriage; an escapement member moved thereby, finger keys; a second cooperative escapement member controlled by said finger keys during both upward and downward strokes of the latter; and means operating automatically at the downstroke of a key for brealn'ng the operative connection between the finger keys and said second escapement member at one part of the down stroke of a key and for reestablishing such operative connection during the down stroke of the key and before the return movement of the key takes place and before a return movement of said second escapement member takes place sufiicient to afford a let-off of the carriage.

2. In a typewriting machine, the combination of a power driven carriage; an escapement member moved thereby; finger keys; a second cooperative escapement member controlled by said finger keys during both upward and downward strokes of the latter; and means operating automatically at the down-stroke of a key for breaking the operative connection between the finger keys and said second escapement member at one part of the down stroke of a key and for restablishing such operative connection during the down stroke of the key and before the return movement of the key takes place and before a return movement of said second escapement member takes place, said means including an adjustable device, the adjustment of which determines at what point in the down stroke of a key the breaking of the operative connection takes place.

3. In a typewriting machine, the combination of a power driven carriage; an escapement member moved thereby; finger keys; a second cooperative escapement member controlled by said finger keys during both upward and downward strokes of the latter; and means operating automatically one part of the down stroke of a key and for reestablishing such operative connection during the down stroke of the key and before the return movement of the key takes place and before a return movement of said second escapement member takes place, said means including a device which may be moved to a position to render the automatically operating breaking means inoperative so that there is no break in the connections during the depression of a key.

4. In a typewriting machine, the combination of a power driven carriage; finger keys; and escapement mechanism for the carriage, said escapement mechanism comprising an escapement rack, a dog carrier, intermediate actuating connections between the finger keys and the dog carrier including an actuating member, and a cam having an inclined cam face in the path of said actuating member and which shifts it from one point on the dog carrier to another at the depression of a finger key.

5. In a typewriting machine, the combination of a power driven carriage; finger keys; and escapement mechanism for the carriage, said escapement mechanism comprising an escapement rack, a dog carrier, intermediate actuating connections between the finger keys and the dog carrier including an actuating member, a cam having an inclined cam face in the path of said actuating member and which shifts it from one point on the dog carrier to another at the depression of a finger key, and means for affording a rotative adjustment of said cam to different set positions.

6. In a typewriting machine, the combination of a power driven carriage; finger keys; and escapement mechanism for the carriage comprising an escapement rack, a dog carrier, means by which the finger keys control the dog carrier, said means including a stepped member and an actuating member, and automatically operating means for effecting a relative shifting movement between the actuating member and the stepped member at the depression of a finger key to eflect'a disconnection between the actuating member and one step of the stepped member and to effect a connection between said actuating member and another step of the stepped member.

7. In a typewriting machine, the combination of a power driven carriage; finger keys; and escapement mechanism for the carriage, said escapement mechanism comprising an escapement rack, a dog rocker having a stepped arm, a key actuated member cooperative with said stepped arm, and automatically acting means for shifting said actuating member from one step to another of said stepped arm at the depression of a finger key.

8. In a typewriting machine, the combination of a power driven carriage; finger keys; and escapement mechanism for the carriage, said escapement mechanism comprising an escapement rack, a dog rocker having a stepped arm, a key actuated member cooperative with said stepped arm, and a cam fixed in the path of said actuating member and operative at the depression of a key to cam said actuating member off one step and onto another step of said stepped arm.

9. In a typewriting machine, the combination of a power driven carriage; finger keys; and escapement mechanism for the carriage, said escapement mechanism comprising an escapement rack, a dog rocker having a stepped arm, a key actuated member cooperative with said stepped arm, a cam fixed in the path of said actuating member and operative at the depression of a key to cam said actuating member off one step and onto another step of said stepped arm, and means for affording an adjustment of said cam to different fixed positions.

10. In a typewriting machine, the combination of finger keys; a carriage; and escapement mechanism therefor, said escapement mechanism comprising an escapement rack, cooperative escapement means that are mounted to vibrate back and forth transversely of the plane of said rack, intermediate connections between said finger keys and said escapement member for affording a control of the latter in both its back and forth movements by the keys, and automatically operating means acting at a down stroke of a key for effecting a disconnection between members of the intermediate connections at one part of the down stroke of a key and reestablishing a different point of operative connection between said intermediate connecting members during the down stroke of the key.

11. In a typewriting machine, the combination of finger keys; a carriage; and escapement mechanism therefor, said escapement mechanism comprising an escapement rack, feed dogs cooperative therewith, a dog carrier, intermediate connections between the finger keys and dog carrier for moving the carrier under control of the keys at both the down stroke and upstroke of each finger key, and automatically operating means for detaching a member of said connections from the carrier and connecting the member to the carrier at another point at the down stroke of the key.

12. In a typewriting machine, the combi nation of finger keys; a carriage; and escapement mechanism therefor, said escape- Inent mechanism comprising an escapement rack, feed dogs cooperative therewith, a dog -carrier, intermediate connections between the finger keys and dog carrier for moving the carrier under control of the keys at both the down stroke and upstroke of each finger key, and automatically operating means for detaching a member of said connections from the carrier and connecting the member to the carrier at another point at the down stroke of the key, and adjusting means by which the point in the operation of a key at which said automatically operating means shall operate may be determined.

13. In a typewriting machine, the combination of a power driven carriage; finger keys; and carriage escapement mechanism, said escapement mechanism comprising an escapement rack, feed dogs that move transversely of the plane of said rack, a dog rocker that carries said dogs, a link under control of said keys, and means for automatically disconnecting said link from the rocker at one point in the down stroke of a key and for reestablishing connection between said link and said rocker before the completion of the down stroke of the key.

14. In a typewriting machine, the combination of finger keys; a power drivencarriage; and escapement mechanism therefor comprising an escapement rack, a holding dog, key controlled means for moving the holding dog into engagement with the teeth of the escapement rack, and automatically operating means for decreasing the extent of engagement between the holding dog and rack without releasing the rack or key.

15. In a typewriting machine, the combination of finger keys; a power driven carriage; and escapement mechanism therefor comprising an escapement rack, a dog rocker controlled by said finger keys in the a movement of the dog rocker from and back to normal position, dogs carried by said rocker, and means operating automatlcally on the down stroke of a key to afford a retrograde movement of the dog rocker without affording a let-ofi' of the carriage.

16. In a typewriting machine, the combination of finger keys; a power driven carriage; and escapement mechanism therefor comprising a key controlled escapement member, a key controlled actuating device operatively connected therewith, and automatically operating means operative at the down stroke of a key to afford a partial retrograde movement of the key controlled escapement member without afiording a let-off of the carriage and for holding the said member against further retrograde movement by the pressure exerted upon the key.

17. In a typewriting machine, the combination of finger keys; a power driven carriage; and escapement mechanism therefor comprising a dog rocker, a key controlled actuating link operatively connected there- Signed at Grand Rapids, in the county of with, and automatically operating means by Kent, and State of Michigan, this sixth day 10 which a change in the relation between said of March, A. D. 1911.

link and dog rocker is effected at the down T stroke of a key and by which a retrograde GLE1\N BARRETT movement of the dog rocker is afforded Witnesses:

without affording a let-oil' of the car- HELEN M. NEWTON,

riage. LULU B. VALENTINE.

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

Washington, D. G.

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