US1012884A - Carriage-feed mechanism for type-writers. - Google Patents

Description

W'. A. MUGOOL. CARRIAGE FEED MEOHANISM FOR TYPE WRITERS. APPLICATION FILED 00T. 10, 1905. BENBWED MAR. 29, 1909. 1,012,884 v Patented Deo. 26, 1911.

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W. A. McCooL. CARRIAGE FEED MEGHANISM FOR TYPE WRITERS. APPLICATION FILED 00T. 10, 1905. RENILWED MAR. 29, 1909.

1,012,884. Patented Dc. 26, 1911.

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W. A. MOCOOL.

CARRIAGE FEED MBGHANISM FOR TYPE WRITERS.

APPLIOATION FILED oT. 1o, 1905. RENBWBD MAB. 29, 1909.

Patented Dec. 26, 1911.

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W. A. MoGOOL. cARmGB FEED MEGHANISM PoR TYPE WRITERS. APPLICATION I'ILED 00T. 10, 1905. RENEWED MAR. 29, 1909. 1,012,884, v Patented Dec. 26, 1911.

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uNTTn sTATns PATENT fernen..

WILLIAM A. MGCOOL, OE BEAVER FALLS, PENNSYLVANIA, ASSIG'NOR TO ACME- KEYSTONE MANUFACTURING COMPANY, A CORPORATION. 0F PENNSYLVANIA.

CARRIAGE-FEED MECHANISM TYPE-WRITERS.

Specification of Letters Patent.

Patented Dec. 26, 1911.

Original application filed June 19, 1903, Serial No. 162,225. Divided and this application filed October 10, 1905, Serial No. 282,170. Renewed March 29, 1909. Serial No. 486,492.

To all whom 'it may concern:

Be it known that I, VILLIAM A. MCCOOL, a citizen of the United States, residing at Beaver Falls, in the county of Beaver and State of Pennsylvania, have invented certain new and useful Improvements in Carriage-Feed Mechanism for Type-XVriters, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to a carriage feed mechanism for typewriters. It is illustrated as applied to a typewriter of the typewheel class in which are embodied a number of my improvements not claimed or described in detail in this case, but forming the subject of my application for Patent No. 162,225, tiled June 19, 1903, of which this application is a division.

Figure 1 is a vertical longitudinal section of the typewriter to which are applied the improvements constituting the subject-matter of this case. Fig. 2 is a front elevation of the same machine, with parts broken away and other parts in section. Fig. 3 is a top plan view with part of the carriage and some of the key levers broken away. Figs. 4 and 5 are plan views representing the ratchet wheel of the carriage driving mechanism and its operating pawl respectively in different positions. Fig. 6 is a detail elevation of the parts indicated in Figs. 4 and 5. Figs. 7 and 8 represent a different form of the carriage feed mechanism, the former being a vertical section and the latter a top plan view. 4

In the accompanying drawings 1 designates a frame made of any suitable material, substantially rectangular in shape and having formed integral therewith, or suitably attached thereto, a longitudinal brace 1a, and a transverse brace 1b. Above such braces and at t-he rear of the frame is the transverse key seat l". Mounted transversely on the frame about midway of its length is a bridge 2, which is milled out or otherwise shaped to form guide-ways for the paper carriage 3 which is adapted to move longitudinally on the bridge 2 trans versely of the frame 1. To the bed piece of the carriage is secured the rack bar 64 with which engages a pinion 63 mounted upon a vertically disposed sleeve or hollow shaft 49. Extending through this sleeve is a shaft end supported by a bracket 53 suitably secured to the bridge 2 of the typewriter frame, and at its lower end by the longitudinal brace 1a. At or near its lower' end is secured a ratchet wheel 50, the teeth of which yare preferably cut with radial faces in the direction of its rotation and with curved working faces upon their opposite sides. This ratchet wheel is so related to the gear wheel 63, at the other end of the sleeve and engaging with the rack 64 of the carriage, that its revolution of one tooth moves the carriage one type space.

The key levers 22 are preferably arranged in banks in the ordinary manner. By their manipulation the type-wheel 47, the hammer l5 that forces the paper and the inking ribbon against the type-wheel and the ribbon feed mechanism are all, through appropriate mechanism, operated. But as these parts and the connecting and operating mechanisms between them and the key levers do not form parts of the invention claimed in this case, they will be described only so far as such description will aid in an understanding of the carriage feed mechanism, which is also operated from the keys. The key levers are normally held elevated by springs 80, and intermediate their fulcrum ends 73 and their striking lettered buttons, they bear upon a cross bar 58 of a rocking frame 81, fulcrumed at 32 and held in a raised position by a spring 128. The cross bar 58 of this rocking frame is preferably slitted to form seats for the key levers which latter are preferably formed of thin bars vertically disposed.

Attached to lugs 85 at the front of the bridge 2 of the frame is a stationary key lever guide 75, also slitted to form seats for the key levers. These two slitted bars, 58

and 75, are so related as to keep the key A levers from a wabbling, holding themin accurate alinement with a diierentially spaced toothed bar 59 that constitutes a part of the setting mechanism for the type-wheel.

54 designates a driving pawl for the ratchet or star wheel 50. It is mounted upon the brace 1a in rear of the ratchet wheel and is guided in its movements by the pins or posts 51 projecting upward from the brace through slots 52 in the driving of the teeth of the wheel.

pawl. These pins or posts are preferably surrounded by anti-friction sleeves or rollers and are headed as indicated in Figs. 4 and 5. The pawl 54 carries a tooth 54a pivoted at 54C and held in working posit-ion by a relatively weak or light spring 54h. The tooth 54L is that member of the driving pawl that engages directly with the teeth of the ratchet wheel 50, and it is provided with a concave face or working edge that is arranged to engage with the convex edges These parts are so arranged and related that each forward movement of the driving pawl causes its tooth to act upon a tooth of the wheel and move the latter a distance equal to that between adjacent. teeth. In Fig. 5 the position of these parts is represented at the end of the forward movement of the driving pawl, while Fig. 4 represents the position of the same parts with the pawl retracted and 'ready to be moved into engagement with a new tooth of the ratchet wheel. The force required to move the carriage, the pinion 63, the shaft 48 and the ratchet wheel 50 is greater than the resistance offered by the .spring 54", with the result that when the tooth 54a comes into engagement with a tooth of the ratchet wheel the former is slightly rocked upon its fulcrum in the direction of the arrow zu Fig. 4, the spring yielding to permit this, and the parts assume the position represented in Fig. 5. As the pawl is retracted and the tooth 54a clears the end of the tooth of the ratchet wheel, the spring restores the pivoted tooth to its normal position where Vit is ready to pass the point of the neXt tooth of the ratchet wheel and engage with its curved face. By this mechanism I am enabled to cause the tooth 54a to be in proper position to successively engage with the teeth of the ratchet wheel, notwithstanding the fact that the movement imparted tothe latter by the advance of thedriving pawl is eq'ual only to the pitch distance between the ratchet teeth.

It will be observed that the teeth of the star wheel 50 are so shaped that the forward edges thereof are substantially radial to the wheel, while the rear edges are curved or cam-shaped; and that the tooth of the reciprocating driving pawl is arranged to act upon the cam surfaces of the teeth of the star wheel as it is moved forward or toward the latter. The driving pawl is mounted so that vit moves in substantially the same hori- Zontal planes as those occupied by the star wheel, and is so guided in its movements that as it reciprocates the part engaging the teeth thereof moves on lines. substantially radial to the wheel.

Movements are imparted to the driving pawl 54 from the rocking frame 81 through the following train of mechanism: 55 is a toggle link pivotally connected at 57 with the rocking frame, and by the pin 117 with the driving pawl 54. The pin 117, carried by the driving pawl plate 54, passes through a short radially curved slot 117a formed in the lower forward portion of the toggle link. 56 represents a pin secured to some stationary part of the frame of the machine, such as the brace la, and extending at right angles to the lines of travel of the pawl 54 and passing through a hyperbolic curved slot 56a in the toggle lilik 55. The relation of the curved slotv 56a in the link 55 and the pivoted connection 57 with the rocking member 81 is such that the total forward travel of the link 55 on its guide pin 56 during the movement of the pawl is accomplished during the first two thirds of the downward swing of the rocking frame S1, and the remainder of the curved slot slides downwardly upon its guide pin 56 without effecting any substantial forward movement of the pawl. Greater 0r lesser lengths of stroke may be obtained by changing the relation of the focus of the curves to the pivotal connection 57 which connects the toggle link 55 with the rocking frame 81. When said rocking frame 8l is depressed the link 55 is driven forward on its guide pin 56 and through its connection with the pawl 54 by means of the pin 117 forces the pawl 54 into engagement with the convex face of one of the teeth of the ratchet wheel 50 and causes said wheel to rotate the pitch distance of one tooth. As the gear wheel 63 is mounted on the same sleeve as the ratchet wheel 50 and meshes with the rack 64 on the carriage 3, said carriage is positively moved the requisite distance to provide for the spacing between the letters. The carriage 3 has no retracting spring but simply rests upon the bridge, being dependent upon gravity for its stability. The rack 64 and gear wheel 63 move it positively in one direction when the keys are depressed, and as the ratchet wheel 50 and sleeve 49 are free the carriage may be moved by hand in either direction at the will of the operator.

In Figs. 7 and 8 I have shown a modification of the carriage moving mechanism. Here, instead of a sliding pawl plate 54 there is a swinging lever 54d pivoted at 54` f This lever at one end is connected to the swinging slotted plate 55 above described and has a tooth 54a adapted to engage successively with the teeth of the wheel 50. At the front end this lever has a pivoted dog 54f, which is adapted to advance the wheel 50 slightly, and at the same time to lock it in position. The dog 54f is held in normal relation to the lever 54l by a spring 54. In this construction when a key is depressed it swings the lever 541 inward and the tooth 54a engages with a tooth and advances the wheel one step. When the key is released the lever 54d returns to its normal position and in so doing causes the dog` tf to impinge on a tooth of the wheel and advance it slightly so that the next time the tooth 54 moves the wheel will be in proper position for advancement. The dog 54;f also serves to hold the wheel 50 in proper positionbut can yield to allow the wheel to rotate in either direction. In the modification shown in these views the sleeve 49 connected with the wheel 50 is not rigidly connected with the rack pinion 63. At the upper end of the sleeve L9 there is a small ratchet 49h and the pinion 63 has spring pawls 49a adapted to engage with the ratchet in one direction of rotation. Ihen the parts are constructed in this way the carriage can be advanced step b y step by the automatically acting device above described, or can be advanced by hand any desired distance without affecting the position of the sleeve 49 or the wheel 50. lVhen it is to be rot-ated by hand movement is permitted by the yielding of thedog 5LP.

that I claim is:

l. In a typewriter, the combination of a frame, a series of keys mounted therein, a

carriage, a toothed wheel for actuating the' carriage, a rocking member actuated by the keys, a link pivoted to the rocking member and formed with two cam slots, a stationary guide pin in one of said slots, a pawl for operating the said toothed wheel, and a pin on the pawl disposed in the second of the the said cam slots.

2. In a typewriter, the combination of a frame, a series of key levers mounted therein, a carriage normally free to be moved forward and back in the frame, a ratch operatively connected to the carriage and having its teeth formed with cam surfaces, an oscillating driving pawl arranged to engage in its forward movement the cam surface of a ratch tooth, and positive transmitting devices between the several key levers and the pawl, whereby the pawl is advanced and the carriage moved on a down stroke of a key lever.

3. In a typewriter, the combination of a frame, a series of keys mounted therein, a carriage, free to be moved forward and back in the frame, a wheel for actuating the carriage, a shaft on which the wheel is mounted, a star wheel on the said shaft having a series of teeth `formed with cam surfaces and a device arranged to be moved forward on straight lines and engage with the cam surface of a tooth of the star wheel when a key is depressed and to be retracted when the key is replaced, whereby the carriage is moved a fixed distance with each depression of a key, but is free to be moved by hand in either direction when a key is not depressed.

4L. In a typewriter, the combination of a frame, a series of key levers fulcrumed therein, a paper carriage, a ratch operatively connected to the carriage and having cam faced teeth, a driving pawl arranged to engage with the cam surfaces ofthe ratch teeth, the tooth engaging portion of the driving pawl being slightly yielding, and means for reciprocating the driving pawl to cause the carriage to be moved a fixed distance with each depression of a key lever.

5. In a typewriter, the combination of a frame, a series of key levers fulcrumed therein, a carriage mounted above the keys, a rack on the carriage, a pinion engaging with the rack, a driving wheel for the pinion having teeth with their rear faces cam shaped, a driving pawl arranged to engage with the cam surfaces of the teeth of the driving wheel, the teeth engaging portions of the driving pawl being slightly yielding, and means for reciprocating the driving pawl and causing the wheel and the carriage to be moved a fixed distance with each depression of the keys.

6. In a typewriter, the combination of a frame, a series of key levers mounted therein, a carriage, a ratch operatively connected to the carriage and having cam faced teeth, a driving pawl having a pivoted toot-h arranged to engage with the cam surfaces of the ratch teeth to move the ratch and carriage, and a spring arranged to cause the pawl tooth to assume a position to clear the end of a tooth of the ratch when the pawl has been retracted.

7 In a typewriter, the combination of a frame, a series of key levers mounted therein, a carriage, a gear wheel for actuating the carriage, a shaft on which the wheel is mounted, a toot-hed wheel on the said shaft, a pawl member operated by the depression of the keys having a pivoted tooth arranged to engage with and turn the said toothed wheel and to yield slightly when in operative engagement therewith, and a spring arranged to cause the said tooth to assume a position to clear the end of a tooth of the wheel when it has been moved away from the wheel.

8. In a typewriter, the combination with a frame, printing mechanism, key levers for actuating said mechanism, and a carriage, of a wheel geared to the carriage and having cam-shaped teeth, an oscillating driving pawl arranged to engage the cam teeth of the wheel, and means for transmitting the movements of the said key levers to the pawl, whereby the carriage is moved by each. depression of a key lever.

9. In a typewriter, the combination of key levers, a paper carriage, a rack on the carriage, a pinion in mesh with said rack, a wheel with cam teeth connected to said pinion, a driving pawl arranged to engage the cam teeth of said wheel, and means controlled by the key levers of the machine for reciprocating the pawl on a line, substantially radial to said wheel.

10. In a typewriter, the combination of the key levers, a paper carriage, a rack on the carriage, a gear wheel meshing in the rack, a star wheel connected with the gear wheel, a driving pawl engaging with the star wheel, the star wheel and driving pawl being situated in substantially the same horizontal planes, means for causing the driving pawl to reciprocate on straight lines toward and from the star wheel, a rocking frame actuated by the keys and a link connecting said rocking frame and driving pawl.

11. In a typewriter, the combination of a frame, a series of keys mounted therein, a carriage, a toothed wheel for actuating the carriage, a rocking member actuated by the keys, a link pivoted to the rocking member and provided with two cam slots, a stationary guide pin in one of said slots, a pawl for operating the said toothed wheel, and a pin on the pawl disposed in the second cam slot, the said cam slots and part being so arranged as to cause a reciprocation of the pawl when the rocking member is actuated.

12. In a typewriter, the combination of a frame having a brace la, a sliding carriage, a rack therefor, a pinion meshing with the said rack, a star wheel connected with the pinion and resting on the said brace of the machine, a driving pawl also mounted on the said brace of the machineA frame, means for guiding the driving pawl in a path t0- ward or from the star wheel, means for reciprocating the driving pawl, and keys for operating the said pawl-reciprocating means, substantially as set forth.

13. In a typewriter, the combination of a frame, a series of keys mounted therein, a sliding carriage mounted on the frame, a toothed wheel for actuating the carriage, a vertically movable rocking member actuated by the keys, a horizontally movable driving pawl arranged to engage with and move the said toothed wheel, and a link connecting the said vertically moving rocking member and horizontally moving driving pawl, arranged to transmit motion directly from the former to the latter, substantially as set forth.

In testimony whereof I aiiiX my signature, in presence of two witnesses.

WILLIAM A. MCCOOL.

Witnesses:

Jos. C. ROUZER, E. T. FnssENDEN.

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

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