US1695520A - Case-shift mechanism for typewriters - Google Patents

Description

c. D. 'YOUNGBERG CASE SHIFT MECHANISM FOR TYPEWRITERS 2 Sheets-She et 1 Filed Jan. 2, 1925 Dec. 18, 1928.-

- 1 1,695,520 c. D. YOUNGBERG 1 CASE SHIFT MECHANISM FOR TYPEWRITERS .2, I 6 35m 1925 I 2 Sheets Shoe 2 Patented Dec. 18, 19 28.

"CONRAD D. Younesnimer woozosro'ox, rumors, assienoa 11o WOODSTOCK TYPE- wnrrnn COMPANY, or WOODSTOCK-ILLINOIS, A CORPORATION or ILLINOIS;

cAsn-snrr'r MEci-rANIs n ron TYPEWR-ITERS;

Application filed January 2, 11925. Serial No. 31.

This invention relates to mechanism for effecting case shifting of power driven apparatus such as that shown inthe application of Otto A. Hokanson Serial No. 732,615, filed August 18,1924, granted January 18,

1927, as Patent No. 1,614,475, for an im provement in power actuated typewriters. The present invention has for itsobject the provision of case shift mechanism which shall be of improved construction and operation and in which the movement and release of the movable part shall be under the control of the operator and shall be produced with a minimum amountof exertion. The invention is exemplified in the combination and an rangement of parts shown'in the accompanying drawings and described in the following specification and it is a more. particularly pointed out in the appended claims. In the drawings: Figure 1-is a vertical sectional view of a typewriting machine showing one embodiment of the present invention; and

, Fig. 2 is a view similar to Fig. 1,"showing a slightly differentform of the invention.

Referring first to Fig. '1, the numeral designates} the frame of a typewriter machine which is provided with a rotary power drum 11 for actuating the type bars in the manner described in the application referred to above. At one side of the frame 10 and:

at oneend of the drum 11 a pinion 12 is secured to the drum ll which meshes with an idler pinion 13 which in turn drives a larger gear 14. The gear 14 is mounted on a stud shaft 15 secured to the side of thefra'me 10 and the pinion 13 may be-journaled ona bracket 16 also projecting from the side of the frame 10. The gear 14 has. a ratchet wheel 17 formed integral therewith and disposed in registration with a tooth 18 on an actuator bar 19. The tooth 18 is normally held upwardly and rearwardlyby a spring 20. The rear end of the actuator 19 is pivand having one face thereof 31 arranged to bear againsta detent 32. The detent 32 is provided with. a shoulder 33 movable into engagement with the shoulder 34 on the stop to retain the case shift frame in its uppermost position. The detent 32 ispivotally mounted at 35 and is provided with a spring 36 normally urging the detent against the face 31. A-shi-ft lever 37 is pivotally mount-' ed at 3'8 and is provided with a contact finger 39 engaging a lug 40 on the actuator 19. When the shift lever 37 is depressed a suffic ent amount to bring the tooth 18 into the path of the tooth on the ratchet wheel 17 the actuator 19 will be drawn forwardly by the rotation of the ra tchetwheel 17 "so that-the link'25 will move the'shiftfra'me 28 about its a pivot 41 until the shoulder 33 on the detent 32 .engages the shoulder 34 on the stop 30. This will lock the shift frame in its uppermost position where it will remain until the detent 32 is released inthe manner tobe described. The actuator tooth 18 will be, moved into-contact with a release screw 42 which will throw the actuator out of engagement with the ratchet wheel 17 and cause it to be drawn upwardly by the spring 20 out of the path of the teeth on the wheel 17.

The detent 32 is provided with a downwardly extending arm 43 which carries a link '44 pivoted at 45 thereon. The forward end ofthe link 44 is provided with a nose 46 disposed adjacent the teeth of the ratchet wheel 17. A plate47 is adjustably mounted on the link 44 and is provided ,withacain lug 48 which engages a screw-49adjustably mounted in a guide pl'ate50. 'lVlien the detent 32 is in the position shown in Fig. 1 withv the link 44 retracted, the cam face 4'8cooperat ing with the screw 49holds the nose 46 out of thecpath of the teeth on the ratchet wheel 17. When the detent 32 rotates upon its pivot 35 to lock the'shift frame in its uppermost position the cam face 48 will move forward to permit the nose 46 to swing upwardly into contact with the teeth on the ratchet wheel 17. So long {as the shift lever 37 is depressed, however', a pin 51 on the side of the lever 37 will engage the link 44 and prevent the nose 46 from swinging into engagement with the ratchet wheel 17. As soon as the shift lever is released, however, the link 44 will be free to swing upwardly underthe influence of a spring 52 connectedtherewith so that the nose 46 will be brought into engagement with the teetliof theratchet'wheel 1 17. This will move'the link44 rearwardl-y so as to disengage the shoulder 33 from the stop 30 and permit the shift frame 28 to return to its lowermost position. The same rearward movement will bring thecam face 48 into engagement with the screw 49 so as to retain the nose d6 out of the path of the teeth on the ratchet wheel 17. It will thus be seen that on a slight depression of the shift key the carriage will be automatically raised to effect a case shifting movement. The power for raising the carriage is furnished from the power driven roller 11, the movement of the shift key alone being sufficient to move the actuator 19 into engagement with the teeth of the ratchet wheel 17. As long as the shift key is held. in its depressed position the platen will remain in its upper case position but soon as the shift key is released the locking mechanism will be disengaged by the power driven ratchet wheel 17 so that the parts will be restored to their lower case position without further effort on the part of the operator. It will be noted that the ratchet wheel 17 is driven at a lower speed than is the main power drum 1.1. In some cases this may be found desirable because of the greater weight of the parts moved during case shifting than that of the parts actuated for writing.

In the form of the invention shown in Fig. 2 the parts are similar to those described in connection with Fig. 1 except that the actuator 19 for the case shift mechanism is arranged to directly engage the main power drum 11 and the nose piece l6 of the release link 44 also engages the main power drum 11. WVhere rapid movement of the case shift mechanism is desired and where the weight of the shifted parts does not interfere with this rapid operation, the arrangement shown in Fig. 2 may be employed.

A single link 44 is provided at one side of the machine only, but it may be operated by shift levers 37 at either side of the machine. These levers are connected bya rock shaft and arms 56, the arms being fixed to the rock shaft and pivoted, one to each of the shift levers 37. In this way depression of either shift lever will actuate the shift mechanism as the two shift levers are constrained to act in unison.

I claim:

1. In a typewriting machine, a case shift member, a continuously operating power drive, an actuator for said ease shift member, a key lever for establishing connection between said power drive and actuator, and power actuated means other than said actuator for controlling the return of said case shift member after operation of said actuator.

2. In a typewriter, a case shift member, a power drive, an actuator for said case shift member, a key lever for effecting operative connection between said actuator and power drive to move said ca se shift member, a latch for retaining said case shift member in the position to which it is moved by said actuator, means for releasing said latch, means controlled by said key lever for connecting said latch releasing means with said power drive to effect release of said latch, and means operated by said key lever for preventing operation of said releasing means while said key lever is depressed.

3. In a typewriter, a case shift member, a power drive comprising a continuously rotating toothed wheel, an actuator for said case shift member, a key lever for moving said actuator into engagement with said tootl'ied wheel to effect a case shift move ment, a latch for retaining said case shift member in its shifted position, means for releasing said latch, and means controlled by said key lever for effecting operative connection between said latch releasing means and toothed wheel upon release of said key lever to effect release of said latch.

4. In a typewriter, a case shift member, k'ey controlled power actuated means including a power drive for effecting a case shift movement of saidmember, a latch for retaining said member in its shifted position, an actuator for said latch movable into engagement with said power drive, means for retaining said actuator out of engagement with said power drive when said latch is released, and key controlled means for preventing engagement of said power drive and actuator when said latch is engaged and said key lever is depressed but permitting engagement of said power drive and actuator to release said latch upon the release of said key lever.

5. In a typewriter, a case shift member, a latch for retaining said case shift member in shifted position, a power driven member, a link connected with said latch and having means thereon for engaging said power driven member, a stop for holding said link out of operative engagement with said power driven member when said latch is in released position but permitting movement of said link into engagement with said power driven member when said latch is in engaged position, a key lever, and means on said key lever for holding said link out of operative engagement with said power driven member when said key lever is depressed but arrangedto permit the engagement of said link with said power driven member when said key lever is released and said latch is in engagement with said case shift member.

6. In a typewriter, a pivoted case shift member, a pivoted latch for holding said case shift member in one position, a power actuated drive, a link connected with said case shift member, key controlled means for establishing operative connection between said link and said power drive, a link connected with said latch and key controlled means for effecting operative connection between said last named link and said power drive. I

7. In atypewriter, a case shift member, a power drive comprising a continously rotating toothed wheel, an actuator for said case shift member comprising a link having a tooth for engaging said wheel, a latch for said case shift member, means for releasing said latch comprising a link having a tooth for engaging said wheel, and a key lever for effecting engagement between the tooth on said actuator and the teeth on said wheel to efiect case shift movement when said key lever is depressed, said key lever operating to establish connection between the teeth on said toothed wheel and the tooth on there leasing means for said latch to effect release of said latch when said key lever is released.

8. In a typewriter, a power actuated member for actuating a portion of a typewriter mechanism, a second power actuated member, reduction gearing interposed between said power actuated members, case shift mechanlsm, a key lever for efiectmgconnection between said second power actuated 'member and said case shift mechanism, a

latch for automatically retaining said case shift mechanism in its shifted position, means for releasing said latch, and means for effecting connection between said releasing means andsaid second power actuated member upon release of said key lever.

9. In a typewriting machine, a case shift member mounted to rock about a horizontal axis, a continuously operating power drive, an actuator for rocking said case shift member, a key lever for establishing connection between said power drive and actuator, and power-actuated means independent of said actuator for controlling the return of said case shift member after operation of said actuator. v

In testimony whereof I have signed my name to this specification on this 29th day of December, A. D. 1924.

CONRAD D. YOUNGBERG.

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