US1792012A - Typewriting machine - Google Patents

Description

Feb. 10, 1931. c.' F. HANDLEY TYPEWRITING MACHINE Filed April 14. 1928 I ATTORNEYS- 10 quently a Patented Feb. 1931 UNITED STATES PATENT OFFICE GEORGE F. HANDLE I Y, OF GLENDALE, NEW YORK, ASSIGNOR TO ROYAL TYPEWRITER COMPANY, INc., or NEW YORK, N.

Y., A CORPORATION on NEW YORK TYPEWRITING EACEINE Application filed April 14,

This invention relates to improvements in typewritingmachines generally, although the invention is particularly directed to improvements in back-spacing mechanisms adapted for use in connection with Royal portable typewriting machines. In a typewriting machine having a pitch 7 above the standard or 12, that is, a lesser number of spaces to the inch and consereater width to each space, difficulty has been experienced in rotating the escapement wheel the required distance during its back-spacin movement, owing to the increased width 0 the spaces between the teeth of the wheel and the failure of the escapement actuating pawl to cooperate in a proper manner with such wheel. This difficulty is caused by the nose of the actuating pawl when picking up a tooth in the initial travel of the escapement wheel, encountering the inclination of the teeth and then being subse uently forced out of contact with the tooth y reason ofthe angle of the tooth becoming more and more inclined after the tooth has passed the center line position. Furthermore, this defect is accentuated by reason of the escapement wheel .in its back spacing movement having to move the escapement stop p'awl through a greater distance than usual.

Among the several objects of my invention are to provide means for overcoming the above defects whereby the escapement actuating pawl will be retained in proper working 35 engagement with the escapement wheel throughout each forward movement of the pawl, and to provide means for insuring the proper cooperation. of the escapement stop pawl with the escapement wheel.

In the accompanying drawings, which illustrate one form of my invention,

Figure 1 is a top plan view of a back spacing mechanism constructed in accordance with my invention, and

Figure 2 is a bottom plan view thereof. Although the invention 'is' applicable to typewriting machines of different types, it is especially intended for use in connection with a Royal portable machine having the carriage escapement mechanism A for con- 1928. Serial No. 270,108.

trolling the movement of the carriage step by the machine. A spring (not shown) func-- 'tions to return said actuating parts to their initial positions. J ournaled on the bracket 9 is apinion 10 which engages the usual carriage rack (not shown) and an escapement wheel 11 having teeth 12, the rack and-wheel being in this instance connected to rotate in ,unison about. a common axis. The diameter of the escapement wheel 11 is considerably greater than the diameter of the pinion 10, and the bar 8 is located under the wheel and alongside the pinion. The wheel 11 in this instance is provided with nine teeth 12, which is a lesser number than is employed in machines having the standard pitch. A spring pressed escapement actuating pawl 13 which is-pivoted at 14 to the slide bar 8 is provided with a plurality of spaced noses arranged in tandem for engaging the teeth 12 of the escapement wheel 11., As shown in the drawings, the pawl is provided with a front nose 15 and a rear nose 16 which are. preferably connected integrally to the body portion of the pawl. The rear end of the pawl 13 is provided with an arm 17 which extends on the side of the pivot 14. opposite the noses 15, 16. This arm. 17 is provided in its rear end with a recess 18 forming-resultant stop shoulders for cooperation with astop pin 19 which limits the rocking movements of the pawl. The wall or shoulder 20 of the recess 18 cooperates with the pin 19 to prevent overthrow o the pawl which would otherwise occur because the tooth of the wheel following the one being actuated would contact with the underside of the pawl." The slidezbar 8 is provided with a tooth 8, which is adapted to contact with the end of the frame 9 as shown I ment of the bar in the same direction, simultaneously with the shoulder 20 engaging the 'stop pin 19. Furthermore, at this time, the

escapement tooth next following the one which has been operated by the pawl, comes into contact with the underside of the pawl as shown ,in Figure 2. Thus the escapement wheel 11 is prevented from being overthrown during each operative movement of the the required distance or movement, as shown in the dotted line position of the pawl in Figure 1.

This partial forward movement of the pawl positions the rear nose 16 in operative engagement with the next tooth of the wheel, whereby said rear nose will function during the latter part of the forward travel of the pawl to rotate the wheel during the second half of the required distance or movement, as shown by full lines in Figure 2. During this second half of the wheelmo'vement, the first tooth of the wheel will necessarily change its angular position relative to the front nose 15-of the pawl and consequently the front nose of the pawl will cease to function.

After the wheel has been moved the required distance, the actuating pawl 13 and the associated operating parts will be returned to their normal positions'by a spring as above described.

The carriage escapement mechanism A includes the escapement plate 21 which is pivoted to the bracket 9 on the side of the escapement wheel 11 opposite the actuating pawl 13. Pivoted to the escapement plate 21 is a stop pawl 22 having a nose 23 for engage ment with the teeth 12 of the escapement wheel. The stop pawl-22 is provided with spaced stops 24 and 25 located on the side of the pawl opposite the nose 23. The lever arm 26 is fulcrumed on the escapement plate 21 for cooperation with the spaced stops 24 and 25, and a spring 27, which has one end connected to the free end of the arm 26 and the other end connected to the plate 21, serves to yieldably retain the arm 26 in contact with either or both of the stops 2i and 25. The arm 26 is provided with an arm 28 adapted to contact with a part of the escapement plate 21 to limit the swinging movement of the arm 26. in a direction away from the stop pawl 22 whereby the swinging movements of the stop pawl 22 will be maintained within limits to properly cooperate with the teeth of the escapement wheel.

The above invention is to be regarded as limited only by the scope of the appended claims.

Iclaim:

1. The combination of an escapement mechanism including an escapement wheel for controllin the movement of a carriage in in one direction, and back spacing mechanism for the carriage including a reciprocatorypawl operable during one stroke of reciprocation to successively engage a plurality of teeth of the wheel for rotating the latter a predetermined distance, a pivoted stop pawl having a nose engageable with the teeth of said escapement wheel and having spaced stops opposite said nose, and yield ablc means cooperating with said spaced stops for limiging the pivotal movements of said stop paw 2. The combination of an escapement mechanism including an escapement wheel for controlling the movement of a carriage in one direction, and back spacing mechanism for the carriage including a reciprocatory pawl operable during one stroke of reciprocation to successively engage a plurality of teeth of the wheel for rotating the latter a predetermined distance, a, pivoted stop pawl having a nose engagea-ble with the teeth of said escapement wheel and having spaced stops opposite said nose, yieldable means for limiting the pivotal movements of said stop pawl including a pivoted armcooperating with said stops, and a spring for yieldably retaining said arm in contact with said stops.

3. The combination of an escapement mechanism including an escapement wheel for controlling the movement of a carriage in onedirection, and back spacing mechanism for the carriage including a reciprocatory pawl operable during one stroke of reciprocation to successively engage a plurality of teeth of the wheel for rotating the latter a predetermined distance, a pivoted stop pawl having a nose engageable with the teeth of said escapement wheel and having spaced stops opposite said nose, yieldable means for limiting the pivotal movements of said stop pawl including a pivoted arm cooperating with said stops, a spring for yieldably retaining said arm in contact with said stops, and a fixed stop for limiting the swinging movement of the arm in a direction away from said stop pawl 4. The combination of an escapement mechanism including a frame and an escape ment wheel journaled on the frame, and a back spacing mechanism including a bar slidably mounted on the frame for reciprocatory movements, a spring pressed pawl pivoted on the bar for engaging a tooth on the escapement wheel to rotate the latter a predetermined distance during one stroke of reciprocation of the bar, and cooperating means between the bar and pawl to maintain said pawl in engagement with the next following tooth ofthe wheel at the end of an operative move ment of said bar, said cooperating means comprising a recess in the pawl forming a resultant stop shoulder, and a stop pin' fixed to the bar for, engagement with said stop shoulder.

5. The combination of an escapement V mechanism including a frame and an escapestroke of the bar to stop further movement of ment wheel journa'led on the frame, and aback spacing mechanism including a bar slidably mounted on the framefor reciprocatory movements, a spring pressed pawl pivoted on the bar and operable during one stroke of reciprocation of the bar to successively engage a plurality of teeth of the escapement diameter of the pinion, a back spacing mechanism including-a bar slidably mounted on the frame and arranged below the escapement wheel and-alongside the pinion, an actuating pawl pivoted to the bar and operable during one stroke of reciprocation of vthe bar to successively engage a plurality of teeth of the wheel for rotating the latter a predetermined distance, and means for preventing overthrow of the pawl at the end of an operative movement of the bar.

' In testimony whereof, I have hereunto subscribed my name.

GEORGE F. HANDLEY.

anism including a frame and an escapement wheel journaled on the frame, and a back spacing mechanism including a bar slidably mounted on the frame for reciprocatory movements, a spring pressed pawl pivoted on the bar for engaging a tooth on the escapement wheel to rotate the latter a predetermined distance during one stroke of reciprocation of the bar, cooperating means between the bar and pawl to maintain said pawl in engagement with the next following tooth of the wheel at the end of an operative movement of said bar, and a tooth fixed to the bar for engaging the frame at the end of said the bar in the same direction. g

7. The combination of an escapement mechanism including a, frame and an escapement wheel journaled on the frame, and a back spacing mechanism including a bar slidably mounted on the frame for reciprocatory movements, a spring'pressed awl pivoted on the bar and operable during one stroke of reciprocation of the bar to successively engage a plurality of teeth of the'escapement ,wheel for rotating the latter a predetermined distance, cooperating means between the bar and pawl to maintainsaid pawl in engagement with the nextwfollowing tooth of the wheel at the end of an operative movement of said bar,

and a tooth fixed to thebar-for engaging the frame at the end of said stroke of the bar to stop further movement of the bar in the same direction.

8. The combination of an escapement mechanism including a. frame, an escapement wheel journaled on the frame, and a pinion fixed to the wheel to rotate therewith, the diameter of the wheel being greater than the

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