US1795337A - Typewriting machine - Google Patents

Description

F. A. HART TYPEWRITING MACHINE Filed Nov.

March 10; 1931.

3, 1927 2 Sheets-Sheet l o hm E @w mm AM u mm mm & V 0 mm L i a MN 2 E g. m w

m k w W 8 4 t k 8\ Q N INVENTOR I ATTORNEY TYPEWRITING MACHINE Filed Nov. 3, 1927 2 SheetsSheet 2 WITIIIESS s INVENTOR A Y "aw L 1 Lu ATTORNEY Patented Mar 10, 1931 FREDERICK A. HART, F NEW BRITAIN, CONNECTIGUT, ASSIGNQR T0 REMINGTON TYPEWRITER COMPANY, OF ILION, NEW YORK, A CORPORATION OF NEW YO 'rvrn'warrrne MACHINE Application filed November 3, 1927. Serial No. 230,841.

My invention relates to typewriting and like machines and especially to motor driven means for returning the carriages of such machines to initial position. My invention has for its principalobject to improve the control mechanism of a certain type of carriage return'mechanism so as to insure freedom from racing of the electric motor. 7

To the above end, my invention consists in certain features of construction and combinations and arrangements of parts all of which will be fully set forth herein and particularly pointed out in the claims.

In the accompanying drawings T have shown my invention applied to the electric carriage return mechanism which has for some time been used on the Remington type- -writer, one form of such mechanism being shown in my prior Patent No. 1,567,590 dated December 29, 1925. As the Remington typewriter with this mechanism applied to it is well known in the art, I have shown in the drawings only so much of the machine as is necessary'to illustrate the embodiment of my invention therein. All of said drawings are fragmentary in character with parts omitted or broken away or shown in section as has been found convenient.

In said drawings Fig. 1 is a side elevation of themachine.

Fig. 2 is a front elevation at the upper part of the machine. Y

Fig. 3 is a left-hand side elevation at the rear ofthe machine and showing the parts in normal position.

Figs. 4 and 5 are similar to portions of Fig. 3 but show the parts in different operated positions, p l

Fig. 6 shows three parts of the mechanism in perspective and disassembled.

Fig. 7 is a rear view in section on the line 77 of Fig. 3. V

The Remington No. 12 typewriter has a frame comprising a base 1, corner posts 2 and a top plate 3, a carriage 4 running on stationary rails 5 and various other devices. The electric I carriage return mechanism comprises a drive unit supportedin a casting 6, the upper part of which passes through the top plate 3 and the lower part of which is secured to the base 1. 9n this casting there is mounted a motor 8 whose armature shaft 10 is connected by a flexible connection 11 toa horizontal drive shaft 12 'ournaled in the casting 6 and cared by evel gears 13 and 14: to a vertical rive shaft 15 also j ournaled in the casting 6 andhaving at its upper end a spur gear 16 meshing with a rack bar 17 mounted by screws 18 on the under side of the rear frame bar of the carriage or truck 4. This rack has a limited sliding movement on the screws 18 in order clutch member 21 is controlled in its up and down movements by a pin 26 projecting into a peripheral groove 27 in said clutch memher, said pin projecting from an arm 28 mounted on a rock shaft 30. Said shaft 30 7. extends leftward across the rear of the machine and its left-hand end is journaled in an ear projecting from a control box 31 which is secured to the left-hand side of the typewriter frame. This box is of rectangular outline as indicated in Fig.1 and" its lefthand side consists of a cover plate which in said Fig. 1 has been removed. Moreover the box itself has been broken away in order to disclose" certain mechanism behind it. On

its left-hand end the shaft 30 has secured thereto an arm 32 projecting forward into the control box 31.- As will presently be explained the shaft 30 and the parts attached operation by means of a hook 36 engaging a pin 37 on said latch, said hook being pivoted at 38 to a lever arm 40 mounted on a rock shaft 41 journaled in lugs on the under side of the box 31. This rock shaft or another one connected with it extends through the typewriting machine to the right-hand side thereof where it has mounted on it a key 42 by depressing which the carriage return mechanism can be set into operation.

In some instances the mechanism can be set into operation automatically at the end of a line of writing. To this end the lever arm 40 has a branch 43 thereof projecting through a slot in the front wall of the box 31 and having pivoted thereto a Vertical link 44 which at its upper end is pivoted to an arm 45 fast on a short rock shaft which is journaled in a bracket 46 secured by a screw to the top plate 3. Said rock shaft has mounted on its forward end an upright arm 47 so that the arms 45 and 47 together in elfect constitute a bell crank. At its upper end the arm 47 has pivoted thereto a horizontal rod 48 which at the middle of the machine is slidably supported in a bracket 50 fastened to the front stationary carriage rail 5. On its end the rod 48 has an arm or tappet 51 adapted to be engaged at the end of a line of writing by the right-hand margin stop 52 on the carriage 4. The con struction is such that atthe end of a line of writing said margin stop engaging the tappet 51 pushes the rod 48 rearward and the rod 44 downward, thus through lever arm 43, 40 and hook 36 releasing the latch 33.

In order to arrest the carriage when it is drawn to the right and to stop the motor, another rod 53 has its right-hand end slidably, mounted in the bracket 50 and said rod carries a tappet 54 lying in the path of the left-hand margin stop 55 on the carriage the construction being such that as the carriage in its rightward motion approaches its initial position the stop 55 will strike the tappet 54 and carry it and the rod 53 leftward until arrested by, the bracket 50. Said rod 53 at its left-hand end is pivoted at 56 to a bell crank 57 which at 58 is pivoted to a vertical link 60, which at its lower end is pivoted to a bell crank 61, 62 which is pivoted at 63 in the control box 31 and is influenced by a restoring spring 64. The horizontal arm 61 vof this bell crank projects forward through a slot in the wall of the box 31 and the lower arm 62 of said bell crank has longitudinally forward and downward, with the result that a shoulder or cam 67 on said bar acts on a roller 68 journaled on a stud 69 of the arm 32, depressing said arm to its normal position where it is caught and retained by the latch 33.

As usually constructed, the tappet 54 has half an inch or so of motion rightward from its normal position before it is arrested and it will be perceived that this tappet and the whole train of connections controlled by it will not be fully restored to normal position by the spring 64 until in its leftward travel the typewriter carriage shall have proceeded this half an inch or so, which under ordinary spacing amounts to some five or six letter space steps of the carriage. It will be perceived that if during these first few steps of the carriage the key 42 were to be operated, the starting mechanismcould not function properly and means have accordingly been provided to prevent the latch 33 from being operated at that time. The particular means shown in the drawing for that purpose is different from that shown in my prior patent hereinbefore referred to and is specifically claimed in other applications now pending. The hook 36 is drawn rearward and slightly downward by the same spring 35 that controls the latch 33 and said hook is held up in position to engage the pin 37 by means of a pin 70 projecting from the bar 65. The construction is such that when said bar is drawn forward and downward by the return motion of the carriage this pin 70 moves to such a position as to allow the hook 36 to drop down out of engagement with the pin 37 so that the latch would not be released even if the keys were depressed. The pin 70 does not restore the latch far enough to make it operative until the shoulder 67 has moved so far away from the roller 68 as to allow the mechanism to function correctly.

The motor circuit comprises a switch mounted in the boX-like base part of the casting 6 beneath the motor 8. A piece of fibre 71 secured to the inner wall'of this box-like casting has secured thereto two strips of met-. al 72 and 73 having. contact points 74 and 75 respectively which tend to come in contact due to the resilience of strip 73. This strip carries a piece of fibre or other insulating material 76 on its upper end against which normally presses the rear end of a rod 77 which passes slidably through the wall of the casting and at its forward end is pivoted at 78 to the depending arm 80 of a bell crank which has also a horizontal arm 81and a split hub 82 by means of which the bell crank is clamped fixedly on the shaft 30. The arm 81 overlies and is normally in contact with a stud 83 projecting from the lever arm 28 whichv is loosely pivoted on the shaft 30.

Said arm has an ear 84 to which is connected one end of a tension spring 85, the other end of which is connected to an arm 86 clamped by a' split hub 87 to the end of the shaft 30. The arm 86 is bent across the hub 82 as shown in Fig. 7. The split hub 87 which can be clamped tightly against the shaft by a screw 88 provides for an adjustment of the arm 86 to regulate the tension of the spring 85.

The rod 77 is not pivoted directly to the arm but is screwed into a piece 90, which piece is so pivoted, and the length of the rod 77 can be regulated or adjusted by screwing in or out and it can be secured in adjusted position by tightening the clamping screw parts connected therewith their tendency to turn in a direction to close the clutch. It will be perceived that the same rocking motion will close the switch 74, 75.

The two springs 93 and are so made and adjusted as that the spring 93 is considerably stronger than the spring 85. v

The mode of operation is illustrated in three steps in Figs. 3, 4 and 5. When the latch 33 is released the spring 93 rocks the shaft 30. The rod 77 is so adjusted as to length that in case the clutch teeth 25 do not collide with the teeth 24 then the clutch section 21 will have been moved up far enough to bring the teeth into good engagement before the contact 75 touches the contact 74. In-case, however, the teeth 25 happen to be directly under the teeth 24 at the time, these teeth will collide as shown in Fig. 4 and the clutch section 21 can rise no further at that moment. As shown in Fig.4, the contacts 75 and 74 have not yet come together. The spring 93 being stronger than the spring 85, the arms 80, 81 and 86 will continue to rotate to the positions shown in Fig. 5 where the contacts are brought together and the motor will immediately be started. In doing this the arm 81 will be lifted off of the stud 83 and the arm 28 will then be under the.

pressure of the spring 85, tending to raise it. As soon as the contacts touch the motor will start and the clutch section 21 will bein to rotate. As soon as the teeth 25 turn from .under the teeth 24, the lower clutch section will be snapped by the spring 85 into full engagement with the upper clutch section.

At the end of the return motion of the carriage the shoulder 67 on the bar 65, de resses the arm 32 and rocks the shaft 30. t this time, the arm 81 acts positively to open the clutch and the rod 77 acts positively to open clutch is not closed is thus rendered impossible. Also it'is assured that at the initiation of a return movement the circuit will not fail to be closed by reason of the collisionv of clutch teeth 25 with the clutch teeth In case the carriage was not quite fully restored as above described, leaving the switch open but the clutch still in engagement, the operator may push the carriage back to initial position by hand, thus opening the clutch, or she can move it to the left by hand, thusclosing the motor circuit, or

she can push by hand rightward on the vertical arm of the bell crank 57, completely disengaging the clutch and leaving the motor circuit also open.

The situation provided for by this Inecha nism, namely, that of racing the motor by reason of not quite restoring the carirage, is one that is not supposed to happen and as a matter of fact it does ha pen only in comparatively rare instances. Vhen it does happen, however, it is troublesome because the motor gets to running very rapidly and if the operator should move the carriage so as to bring the clutch into engagement the gearing will be started with a severe hammer blow which is likely to result in considerable injury to the mechanism, either stripping some gear teeth or injuring some other parts.

What I claim as new and desire to secure by Letters Patent, is

l. The combination with a carriage, an electric motor having a normally open circuit, and driving connections from said mo; tor to said carriage including a normally open clutch, of controlling means including a spring tending to close said clutch, an actuator connected when moved in one direction to open said clutch positively against the action of said spring but capable of moving in the other direction independently of the clutch and permitting said spring to close said clutch, and means controlled by said actuator when the latter is moved in the first said direction to open said circuit before the clutch is opened and in the said other direction to close said circuit after said actuator has moved far enough to permit the clutch to be closed.

2. The combination with a carriage, an electric motor having a normally open circuit, and driving connections from said motor to said carriage including a normally open clutch, of a rocker having an arm fast thereon, an arm loose onsaid rocker and operatively connected to open and; close the clutch, said fast arm acting positively on said loose arm only in the direction to open said clutch,

a spring acting on said loose arm in the direction to close said clutch, circuit closing means operated by said rocker to close the circuit after said rocker has moved far enough to permit said spring to close the clutch and to open said circuit before said fast arm has moved far enough to open said clutch.

Signed at the borough of Manhattan, city of New York, in the county of New York and State of New York, this 2nd day of November, A. D. 1927.

FREDERICK A. HART.

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