US1686325A - Case-shift mechanism - Google Patents

Description

' I o. A. HOKANSON CASE SHIFT- MECHANISM Filed May 10,, 1924 La I;

ww Q E. U wv v ..EE QM \v 49 g Patented Oct. 2, 1928.

UNITED STATES 1,686,325 TNT. OFFICE.

OTTO A. HOKANSON, OF WOODSTOCK, ILLINOIS, ASSIGNOR TO WOODSTOCK TYPEWIRITER COMPANY, OF WOODSTOCK, ILLINOIS, A CORPORATION OF ILLINOIS.

CASE-SHIFT MECHANISM.

Application filed May 10, 1924. Serial 150 712182.

This invention relates to power-actuated mechanism for effecting a case shift to change from one case to another and has for its object the provision of mechanism which shall retain the typewriter parts in the case position to which they are shifted so long as the shift key isheld depressed, the shift being effected either by power-drivenmechanism or by hand.

Another object is to provide mechanism of the class named which shall be of improve construction and operation.

The invention is exemplified in the combination and. arrangement of parts shown in the accompanying drawing and described in the following specification, and it is more particularly pointed out in the appended claims.

In the drawing Fig. 1 is a vertical section showing a p01- tion of a typewriter having one embodiment of the present invention applied thereto; and

Fig. 2 is a fragmentary view looking from the right in Fig. v1, but drawn'on a larger scale.

The machine is type keys 9.

The numeral 10 designates the platen carriage mounted on runways 11 and having a; sub-carriage 12 pivotally mounted thereon;

provided with I the: usual the platen 13 being supported by the subcarriage. An arm 14 pro]ects downwardly from the sub-carriage 12 and supports a roller 15 journaled at the lower end thereof. The roller 15 travels on a shiftrai-l 16 carried by a shift frame 17 pivotally mounted at 18. The shift frame 17 has a bell-crank 19-adjustably secured thereto by screws 20. A spring 21 is fastened to the shift frame 17 for partially counterbalancing the Weight of the sub-carriage 12 and platen l3.

' A link 22 is pivoted at 23 to the lever arm 19, the opposite end of the link being pivoted at 24 to a plate 25 pivotally mounted at 26 on a cross-bar 27. The link 22 is made in two sections having a spring 28 interposed ther'ebetween for yieldingly resisting longitudinal expansion of the link. The plate 25 is slotted at 29 to receive a pin 38 carried by an actuating-lever 31. The lever 31 is pivot ally mounted at 32 on a cross-bar 33 and pressed upwardly by a spring 34: A cam face 35 is formed on the lever 31 in the path of rollers 36 carried by a mutilated gear 37. The gear 37 is journaled on a shaft 38 which plunger 48 will move downwardly releasing is supported in the sides of the machine frame.

A power driven gear 39 is journaled in the machine frame in position to mesh with the mutilated gear 37. A lever 40 is pivoted at 41 and'is pressed upwardly by a spring 42. The upper face of the lever 40 engagesone of the rollers 36 tending to rotate the gear 37 in a counterclockwise direction, as viewed in Fig. 1. Rotation of the gear 37 is normally prevented by a stop 43 on an escapement dog 44 pivotally mounted on the shaft 41 concentric with the pivot of the lever 40. The escapement dog 44 is providedwith an extension 46 to-which the spring 42 is attached. A plunger 48 is pivoted at 49 to the extension 46 and lies in the path of a projection 50 on the shift lever 51,- the shift lever being provided with a key 52 properly located in w the keyboard of the machine.

The lever 51 is pivoted at 53 on a cross-bar 54 and is held in its uppermost position by a spring 55. An upwardly projecting arm 56 is carried by the lever 51 and supports an extension 57 .pivoted thereon at 58. The exten-. sion 57 carries a tailpiece 59 at its lower end which is connected by aspring 60 with a lug 61 on the extension 56. A stop screw 62 is threaded in the tailpiece 59 and strikes upon a lug 63 formed on the arm 56. The upper end of theextension 57 is beveled at 64 and is positioned adjacent a bracket 65 carried by the shift frame 17. i

.When the shift key 52 is depressed the the stop 43 from the path of the roller 36. The lever 40 will then rotate the mutilated gear 37 to bring the teeth thereof into mesh with the-teeth on the roller 49. The roller- 39 is continuously driven in a clockwise direction, as viewed in Fig. 1, so that as soon as the teeth on the mutilated gear mesh with the teeth on the roller the gear will be driven by the roller until all of the meshing set of teeth have passed the driving gear. sion of the key 52 will move the lower end of the escapement dog 44 into the path of the uppermost roller 36 so that rotation of the multilated gear will be arrested after the blank portion thereof has come into registra- 105 ator will shift the plate 25 about its pivot 26 11 0 Depresand exert tension on the link 22, which tension will in turn shift the bell crank 19. and raise the shift rail 16, changing the platen from one case position to another.

Initial depression of the key 52 will cause the arm 56 to move forwardly and bring the extension 57 against the bracket 65. This will rotate the extension 57 about its pivot 58 stretching the spring 60. As soon as the shift frame 17 is moved by the link 22 the beveled end 6 1 of the extension 56 will be moved beneath the lower edge of the bracket 65 by the spring 60. This will retain the shift frame in its uppermost position as long I as the shift key is held'in its depressed position. As soon as the shift key is released,

however, the arm 62 will move rearwardly and withdraw the extension 57 from beneath the bracket 65 to permit the platen to return to its lower position. It will be seen that the shift keymay be held depressed as long as desired while other keys are operated for typewriting in the upper case, the operation being exactly the same as that of a hand actuated machine, except that the power for raising the shift frame is furnished by the power driven gear 39 and not by the force exerted on the shift lever. It is only necessary for the operator to exert suflicientforce on the shift lever to release the power driven mechanism and this mechanism furnishes the power for shifting the platen.

In order to avoid strain on the parts the connection between the power driven roller and the shift frame is provided with the resilient link 22 which prevents any violent movement and permits yielding in case the platen. should in any way be held against shifting. In order to adjust the position of the beveled face 64 relative to its cooperating bracket 65 the extension 57 is mounted on an eccentric bearing sleeve 66 which is carried on the pivot bolt 58. When it is desired-toadjust the vertical position of the extension 57 the bolt 58 is released andthe hexagon head 67 secured to the sleeve 66 is'rotated to move the extension 57 vertically and the bolt again tightened to lock the sleeve in its adjusted position. The eccentric sleeve when the bolt is tightened is clamped between the bolt held and a spacing collar 68. It will thus be seen that I have provided a poweractuated case shift which may be moved of the machine frame and are provided withlevers 79 by which they may be rocked about their pivots. It will be apparent that when the levers 79 are moved rearwardly the cam depressed while the plunger 48 is in this position a pin 80 will strike the upper bifurcation 81 which f0 ms the slot 29 and thus rotate the lever 25 d wnwardly to operate the link 22 and the case shift mechanism.

It will be seen that the mechanism may be,

operative by depression of said key lever for retaining said member in its shifted position while said key lever is depressed and for releasing said member to return to normal position on release of said key lever.

2, In a typewriting machine, 7 a member movable to change from one case to another, power actuated means for shifting said member, a key lever forcontrolling said power actuated means, and means mechanically connected with said key .lever and rendered operative thereby for retaining said member inits shifted position solong as said key .lever is depressed but permitting return of said member to normal position upon release of said keylever irrespective of the operation of other parts of said typewriter.

3. In a typewriting machine, a member movable to change from one case to another, power actuated means for moving said member, a key lever for'controlling said power actuated means. type keys, and means controlled by saidfirst-mentioned key lever and mechanically connected therewith for retaining said memberin its shifted position and for permitting return thereof irrespective of the operation of said type keys.

4. In a typewriting machine, case shift mechanism, a power drive, means for connecting said power drive with said case shift with very little effort on the part of the op- 6 erator and which requires no new manipulation other than that to which the operator is accustomed to use in connection with the ordinary hand key-board.

The plunger 48 is guided by an angle bar 70 having an ear 71 at each side of the machine pivotally mounted at 72 on a plate 73. The plate 73 is pivoted at 7 4 to the sides of the machine frame and carries pins 75 which cooperate with cam groves 76" in plates 77. The plates 77 are pivoted at'78 tothe sides rom said power drive while said shift key is retained in depressed position, and means for retaining said case shift mechanism in its shifted position while said shift key is retained in depressed position, said retaining means being mechanically and yieldingly connected to said shift key and moved thereby into operative relationwith said shift mechanism when said .shift key is depressed but operated to release said shift mechanism when said shift key is released.

5. In a typewriting machine, case shift mechanism, a power driven member, a rotary member having a fixed axis of rotation and driving means for connection with said power driven member for a portion of a revolution of said rotary member, an eccentrically disposed driver on said rotary memher, means actuated by said driver for operating said case shift mechanism, a key for controlling the connection between said power driven member and said rotary member, and means for preventing repeated operation of said rotary member when said key is depresed. I

6. ,In -a typewriting machine, a power driven gear, a mutilated gear having a fixed axis of rotation arranged to mesh with said power driven gear through a portion of rotation of said mutilated gear, a key for controlling the connection between said power drivengear and said mutilated gear, and means actuated by said mutilated gear for operating said case shift mechanism.

7 In a typewriting machine. a power drive, a rotary member movable into operative, engagement with said power drive,-

means normally holding said rotary member out of operative engagement with said power drive, a shift lever for releasing said holding means to permit engagement between said power drive and rotary member, an eccentrlcally disposed driver on said' rotary member, an actuating member operated by '7 said driver when said rotary member is driven'by said power drive, and case shift" mechanlsm operated by said actuating member.

drive, a rotary member having means thereon for operatively engaging said power drive during a portion of rotation of said member, a spring-pressed device for moving said rotary member into position to en age said power drive, a stop for holdin said rotary member out of engagement wit said power drive, a shift key for releasing said stop from said vrotarymember, an actuator arranged to be engaged by said rotary member when driven by said power drive, means for arresting said rotary member to prevent repeated engagement thereby with said actuator, and case shift mechanism connected with said actuator.

9. In a typewriter, a power drive, a rotary member having means thereon for engaging said power drive for a portion of a.

revolution of said rotary member, a shift key for controlling 'the connection between said rotary member and power drive, means for arresting said rotary member to prevent re- .peated operation thereofafter a depression of said shift key, case shift mechanism, op-

6 erated by said rotary member, and means for 8. In a typewriting machine, a power I retaining said case-shift mechanism in its shifted position while said case shift key is held depressed.

10. In a typewriter, the combination with a shift frame for changing from one case to another power actuated means for moving said shift frame, a key lever for controlling said power actuated means, and a stop carried by said key lever for locking'said shift frame in its shifted position.

11. In a typewriting machine, the combination with a shift frame for changing from one case to another, power actuated means for moving said shift frame, a shift lever for controlling said power actuated means, and a stop carried by said shift lever and movable thereby into position. to engage said shift frame and retain said shift frame in its shifted position, said stop being released by said shift lever when said shift lever is permitted to return to its normal position.

12. In a typewriter, the combination with a shift frame, of power actuated means for moving said shift frame, a key lever, a stop movably mounted on said key lever, and yielding'means for holding said stop in one position relative to said key lever, said stop being movable upon depression of said key lever into position to hold said shift= frame in its shifted osition.

, 13. In a typewritmg machine, the combination with a shift frame for changing from one case to another, a power drive for moving said shift frame of a key lever for controlling the movement of said shift frame, and a stop actuated by said key lever for locking said shift frame in its shifted position and out of driving relation with said power drive. I I

14. In a typewriting machine, the combination with a shift frame for changing from one-case-to another, ofpower driven means for moving said shif t frame, a key lever for controlling the movement of said shift frame, and a stop actuated by said key lever for locking said shift'frame in its shifted position out of driving relation with said power driven means when said key lever is depressed but releasing said shift frame when said key lever is released.

15. In a typewriting machine, the combination with a shift frame for changing from one case to another, of means for moving said shift frame, a keylever for controlling said moving means, a spring stop carried by said key lever, and a cooperating stop member mounted on said shift frame for engaging said spring stop. s

16. In a typewriting machine, a member movable for changing from one case to another, power actuated means for moving said member, a case shift lever for moving said case shift member and having connection with said power actuated means for controlling said power actuated means, andmeans for disconnecting said power actuated means from said case shift lever to permit opera tion of said case shift mechanism by said shift lever.

means controlledby said shift lever for con- 10 necting said case shift mechanism with said power drive, and means for moving said connectmg means out of operative relation with said-case shift lever to permit hand operation of said case shift mechanism by saidshift lever.

In testimony whereof I have signed my name to this specification on this 7th day of May, A. n. 1924.

' LOTTO A. HonANsoN.

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