US2099504A - Typewriting machine - Google Patents

Description

NOV. 16, 1937. UTZ

TYFEWRITIING MACHINE Original Filed May 1, 1936 A rzZ hang [1&2

Patented Nov. 16, 1937 TYPEWRITING MACHINE Anthony Utz, Hartford, Conn., assignor to Royal. Typewriter Company, Inc., New York, N. Y., a corporation of New York Original application May '1, 1936, Serial No. 77,420. Divided and this application August 27, 1936, Serial No. 98,233

3 Claims.

quiet escapement action is produced during the step by step feeding movement of the carriage.

With this and other objects in view which will more fully appear, the nature of the invention will be more clearly understood by following the description, the appended claims, and the several views illustrated in the accompanying drawing.

In the drawing:

Figure 1 is a rear elevation, partly in section, of an escapement mechanism constructed inv accordance with my invention.

Figure 2 is an enlarged section taken on the line 2-2 of Figure 1, and

Figure 3 is a perspective view of the flexible stop for the pivoted pawl.

In the accompanying drawing, 5 indicates the usual rack which is attached to the carriage, and supported on the main frame of the machine below the rack is a frame A for supporting the escapement mechanism. The frame A includes two spaced horizontal arms 6, 6 and an upwardly extending vertical arm I. Journaled in the vertical arm I is a shaft 8 on which is rotatable a pinion 9 having teeth It] for engaging the rack 5. Fixed to the shaft 8 is an escapement wheel I I having teeth 12. A back dog I3 for the pinion 9 is pivoted as at l3 to the escapement wheel H.

The escapement wheel ll is intermittently released during the step by step feeding movement of the carriage by the following noise-reducing mechanism: Pivoted on the horizontal arms 6, 6 of the escapement supporting frame A as at 23, 23 is a dog rocker C which carries a fixed dog 24 and a pivoted or limber dog 25 which intermittently engage the teeth l2 of the escapement wheel in the usual manner whenever the dog rocker C is rocked by the key levers.

A flexible stop arm D for the pivoted dog 25 is preferably formed from flat spring steel, and includes an attaching bracket 26 which is positioned against the front face of the rocker C and is secured thereto by rivets 21, the stop arm being disposed in rear of the rocker and extending upwardly from and at right angles to the bracket 26. The upper end of the flexible stop arm D is bent laterally towards the pivoted dog 25 to form an ear 28. A metal block 29 is positioned against the under face of the ear 28 and is secured to said ear by a rivet 30. The block 29 is in loose contact with the arm D as indicated at 3| in Figure 1, and is formed with'a horizontal threaded opening 32 for adjustably receiving a stop screw 33, said screw extending into the opening 32 through an alined opening 34 formed in the arm D. The diameter of the opening 34 is slightly greater than the diameter of the stop screw, and this functions to permit the block 29 and the stop screw 33 to receive the impact of the pivoted dog 25, transmitting the sound waves directly to the stop D.

The rocker C is provided with a limiting ear 35 which is located on that side of the flexible stop arm D opposite the pivoted dog 25. This car 35 is spaced from the arm D a distance sufficient under normal operating conditions to avoid being contacted by said arm. Should, however, an accidental heavy thrust be imparted to the arm, any undue flexing thereof will be prevented by its contacting said ear.

A coil spring 36 which has one end connected to the pivoted dog 25 and the other end anchored to the rocker C, functions to yieldingly urge the dog away from the stop screw 33 and against a sound deadening stop 31 mounted on the rocker.

In operation, assuming the parts to be in their normal positions, as viewed in Figure 1, the rocker C is rocked upon depression of a key lever and the pivoted dog 25 is thereby released from the tooth of the escapement wheel. The escapement Wheel is then rotated by the carriage spring until said released tooth engages the fixed dog 24, and simultaneously the pivoted dog 25 is swung against the stop 3! by means of the spring 36. The rocker C is then returned to its initial position by the usual return spring, and the pivoted dog is thereby carried into the path of. the next tooth of the escapement wheel, the latter being free to turn the pivoted dog 25 to its normal or starting position against the stop screw 33. The impact of the pivoted dog against the stop screw 33 will cause the stop arm D to flex and thereby reduce the noise of impact which would otherwise occur if the arm were rigid.

It is of course to be understood that the details of structure and arrangement of parts may be variously changed and modified without departing from the spirit and scope of my invention.

I claim:

1. In a typewriter or like machine, an escapement mechanism including an escapement wheel,

a dog rocker, a fixed dog and a movable dog mounted on the rocker and alternately movable into engagement with the teeth of the wheel, a flexible stop arm for the movable dog mounted on the rocker, and an adjustable stop mounted on said arm for direct contact with said movable dog.

2. In a typewriter or like machine, an escapement mechanism including an escapement wheel, a dog rocker, a fixed dog and a movable dog mounted on the rocker and alternately movable into engagement with the teeth of the wheel, a flexible stop arm for the movable dog mounted on the rocker, the upper end of the arm terminating in an offset ear, a block fixed to said ear and provided with a threaded opening, and a stop screw mounted in said threaded opening for direct contact with said movable dog.

3. In a typewriter or like machine, an escapement mechanism including an escapement wheel, a dog rocker, a fixed dog and a movable dog mounted on the rocker and alternately movable into engagement with the teeth of the wheel, a flexible stop arm for the movable dog mounted on the rocker, an adjustable stop mounted on said arm for direct contact with said movable dog, and a limiting stop for the flexible arm fixed to the rocker and disposed on that side of the arm opposite the movable dog and normally spaced from said arm.

7 ANTHONY UTZ.

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