US732498A - Type-writer. - Google Patents

Description

- No. 732,498. PATENTED mmso, 1903.

N. L. ANDERSON.

TYPE WRITER.

' APPLICATION FILED MAY 10, 1902. H0 IODEL. 2 SHEETS-SHEET 1.

1/91 lineage 4%? Nil PATENTED JUNE 30, 1903. N. L. ANDERSON.

v TYPE WRITER.

APPLIOATIQN FILED MAY 10. 1902.

' 2 SHEETS-SHEET 2.

N0 MODEL.

l luueu Fox :tric starter.

U ITED STATES Patented June so, 1903.

PATENT OFFICEO TYPE-WRITER.

$EECIFICATION formingpart of Letters Patent No. 732,498, dated June 30, 1903.

Application filed May 10,1902. Serial No. 106,802. (No model.) I

To all whom it may concern:

Be it known that I,:NEAL LARKIN ANDER- SON, acitizen of the United States,-residing at Montgomery, in thecounty of Montgomery,

Stateof Alabama, have invented certain new. and useful Improvements in Type-Writing The object of my present invention is to greatly simplify the-structure and lessen the cost of the manufacture of the machine, while still preserving the characteristic and general mode of operation of the former invention, and especially to modify the construction of v the automatic electric switch, to provide an automatic starter for the electric motor, and to provide different degrees of torque for said motor corresponding to the tension of the return-spring. V I

In the accompanying drawings, Figure 1 represents a side elevation of the motor and return-spring mechanism, shown asa separate structure, to be applied to any typewriter. a Fig. 2 is a rear elevation showing certain details. Fig. 3 is a frontelevation of the same, showinga simplified automatic electric switch and simplified structure of the return-spring mechanism and an automatic electric starting mechanism for the electric motor. Fig. 4 is a cross-section of the side elevation, showing certain details of the automatic switch. Fig. 5 shows a detail of the hand-lever switch in the base of the motor and means for changing the speed of the electric motor and insuring the prompt starting of the motor by means of the automatic elec- Fig. 6 is a transverse section through a type-writer of the Remington type with my invention applied thereto. Fig. 7 shows a modification of the mechanism for ing or frame. a shaft suitably journaled in a bracket mountchanging the motor-speed after the motor has started.

Referring tothe drawings, A represents the frame'of the small electric motor mounted as described in my. Letters Patent No. 695,779. It should be noted that inasmuch as gear A is mounted on armature-shaft A and gear A on the shaft of the return-spring mechanism I have done away with the use of the gear cas- Gears a and a are mounted on ed on the face of the casing of the electric motor. The mounting of the return-spring and the cam and pulley mechanism for effecting the return of the carriage and the automatic release of the return-spring are the same in structure and operation as in my former patent, except that in place of the spur-gear O, with its accompanying pinion and ratchet,I have substituted a ratchet 0, thus simplifying the structure and lessening the cost of the device. Normally engaging the ratchet-wheel O is a pawl F formed on lever F, which in turn is mounted on a projection of the motorcasing A by means of a pivot. This lever F, which constitutes the starting and stopping device for the spring-drum and, secondarily, for the electric motor, as in my former patent, is connected atone end to the link K and is provided with a pin F adapted to engage a slot in lever I, to be explained later on. A

spring F normally presses F and forces F into engagement with the teeth of the ratchet C. An L-shap'ed locking-arm I cooperates with the pawl Fand is pivot-ally mounted on a projection of the motor-casing A and is acted upon by a flat spring 1 secured to the casing at I, which tends to force the said arm I against the pin F Secured within the outer periphery of cam D by a suitable pin is let into the inner periphery of this ring V3,

and a short distance beyond this is a smaller fiber block W. The fiber disk U, with brass hub and bushing, is mounted on shaft B by a set-screw U Fastened to the outer surface of this disk and insulated therefrom is a thin brass ring U. On the outer edge of disk U, perforating its interior, is a hole in which works a brass pin X. Around this is a light coiled spring X pressing said pin outward into constant contact with the inner periphery of ring V Pin X is also in metallic contact with the under surface of the brass ring U.

The circuit for supplying current to the electric motor leads from one side of a suitable battery ormain to a binding-post on the motor a, thence to a copper brush WV fastened to the motor-casing, but insulated therefrom. This brush is in constant contact with ring V W is a copper brush fastened also to the motor-casing and similarly insulated therefrom and in constant contact with the brass ring U on the fiber disk U. From this brush W run-s a wire to the field of the motor. Thus when the electric motor is at rest the pin Xisin contact with the fiber W on the ring V and the current from the main to the motor is broken.

The operation of the carriage-return mechanism, cams, pulley, 850., is in all respects similar to that of Letters Patent, March 18, 1902, No. 695,779.

I will now describe the operation of the simplified structure of lever F and the automatic switch mechanism.

While the line is being written, 0 islocked by means of the pawl F on lever F. IVhen, however, it is desired to return the carriage to the beginning of the new line, the operator strikes the return-key, which by means of the link K pulls down the lever F, releases pawl F from engagement with the ratchet C, and allows the return-spring C to rotate gear 0 and cam-ring D. The rotation of said ring D causes the cam-teeth d to ride up the incline of teeth (1 on ring D and forces said ring toward the pulley D When the clutchteeth (1 and 01 come into engagement, pulley D is carried around with the springdrum, winding up the band N and reversing the carriage, and thereby restoring the tension of the main spring, which advances the carriage, as in my former patent referred to. As lever F is pulled down by link K it forces back the lock-arm I until pin F has reached the slot I when under pressure of spring I this slot I locks lever F in position shown, Fig. 3, holding pawl F out of engagement with ratchet G. Then the ratchet O is thus released by link K, the spring-drum and ratchet attached to same begin to revolve, and thereby pin X is advanced beyond the fiber W and is brought into metallic contact with brass ring V thus closing the circuit through the electric motor. When the carriage reaches its initial position, the trip H engages pin 1 on lever I and rocks said lever to release the lever F, which by means of pawl F again engages. ratchet 0, thus stopping the spring-motor and releasing pulley D from engagement with the cam D, as in my former patent referred to. The electric motor continues to revolve shaft B and fiber disk U, attached thereto, until pin X comes into contact with the short fiber block W, when the circuit is broken for an instant. The momentum of the motor, however, causes shaft B to carry pin X past the fiber block W, and the circuit is again closed, and motor drives shaft B until pin X reaches fiber block W, when the circuit is again opened, and the electric motor having had its momentum already checked by fiber W now comes to rest.

It sometimes happens that it is desirable to change the speed of the motor to correspond to variation of the voltage of the current on the main. This is accomplished by means of a coil of German-silver wire or other resistance mounted in the base of the motor, Fig. 5. One wire from the main S goes to the resistance-coil and after a few turns of the resistance-coil has a branch wire S soldered to it.

S S S are branch wires soldered to the coils of resistance-wire with relatively morewindings each, so that the current has its greatest resistance when it has passed to the motor through S and relatively less from S S S An ordinary hand-switch is set in the base of the motor, as shown in Figs. 1 and 5. One end of the switch is pivoted at S and is connected to the wire S leading to the commutator. Comparing Figs. 3and 5, it is evident that when the switch is thrown so as to unite S and S the current has least resistance from the coil. By throwing the switch successively to points S, S and S the resistance is increased, and the motor runs at relatively less speed.

In using current from an alternating-circuit main it is sometimes desirable that the motor should start more promptly and with greater torque than would be derived from the normal strength of the current to which the switch has been set. I have consequently provided a small automatic electric starting mechanism, by means of which a very strong current is thrown through the motor during the time the carriage is being returned to the beginning of the new line and is then automatically cut out, leaving the motor to continue its revolutions under the normal strength of current to which the switch is set.

The wire S is soldered to the resistance-wire of the coil after a few turns have been made around the coil, or, if desired, it may be soldered to the wire from the main before it enters the coil at all. This wire S runs to an insulated brush S on lever F, Fig. 5, and another wire S connects with the motor through the base of switch S and runs to the brush S insulated on the motor-casing at S It is obvious that when the key-lever pulls down the lever F brushes S and S are in contact and the strongest current passes through the motor until the carriage reaches its initial position, when the trip H strikes t'helever-arm I, releasing lever F, thus breaking the contact-points S and S and leaving the motor to continue its revolutions with the normal strength of the current to which the switch S is set. ing the contacts between S and S, as shown, is due to the fact that if the strongest currentwere left on during the entire time the electric motor is in circuit said motor would acquire such momentum as to carry pin X beyond both fiber blocks W and W, thus overwinding the return-spring. induction-motor is used, S and S may be connected with the commutator in such a way that the motor will start under full torque as a series motor, when the contacts 5 and S are broken and will continue its windings under reduced torque as aninduction-motor, when said contacts are closed, as illustrated in Fig. 7, in.which the wires from S and S are connected to the respective wires entering and leaving the motor-commutator, shortcircuiting the motor-armature when contacts S and S are closed, thereby converting said motor into an induction-motor. When the pawl-lever F is disengaged from the springmotor during the return of the carriage, contacts S and S are disengaged, and the motor starts as a series motor under an increased torque, which is reduced when the armature is short-circnited by contacts S and S, as above described.

It is to be noted that both forms of the mechanism for determining the initial and final speeds of the motor comprise a relativelylowresistance circuit subsidiary to the main motor-circuit controlled by means of the cont acts S and S and releasing-lever F, that in the first instance depending upon the closure of a low-resistance path in the motor-circuit by way of said contacts to permit an abnormal current to flow through the motor and develop an abnormal starting torque in said motor and that in the modified form depending upon the establishment of a lowresistance circuit or short circuit for the m0- tor-armature by way of contacts S and 8, thereby converting said motor into an induction-motor, having a relatively reduced torque for a given current-fiow.

What I claim is 1. A type-writer, having a paper-carriage, means for impelling the carriage in its advance movement, a spring-motor for impelling said carriage in the opposite direction, a pulley-wheel connected with the carriage, cam-rims, on said pulley and said springmotor respectively, a ring intermediate of said pulley and said motor and provided with cams cooperating with the respective cam-rims on the pulley and motor, said mechanism being adapted to connect said carriage The necessity for break- 7 When an,

starting and stopping the spring-motor, said means comprising a ratchet fastened to the spring-drum, a cooperating pawl-lever engaging said ratchet-teeth and holding said spring-drum normally inoperative, a key-actuating lever releasing said pawl from engagement with said ratchet, a locking-lever, locking said pawl out of engagement with said ratchet during the return movement of the carriage, and a trip fastened to the pulley, said trip being in line with a pin on the locking-lever and adapted to release said pawl from the rocking arm, and permit it again to engage the said ratchet when the beginning of the line has been reached.

2. A type-writer having a paper-carriage, means for impelling said carriage in its advance movement, a spring-motor for impelling the carriage in the opposite direction, an auxiliary electric motor, with means for starting and stopping said electric motor, comprising two circuit-terminal brushes, an

insulated metal disk fastened to the shaft'of,

the return-spring motor, said disk being in constant electric contact with one of said terminal brushes, and a ring surrounding said disk and fastened to the spring-drum of said return-spring, said ring being in constant electric contact with the other brush of said terminals, with means for automatically making and breaking electric circuit between said ring and disk.

3. A type-writer having a paper-carriage, means for impelling said carriage in its advance movement, a spring-motor for impelling the carriage in the opposite direction, an auxiliary electric motor for storing energy in said spring-motor, and with means for starting and stopping said electric motor, comprising two circuit-terminal brushes fastened to a stationary part of the apparatus, an'insulated metal disk fastened adjustably upon the shaft of the returnspring motor, said disk being in constant contact with one of said terminal brushes, a ring surrounding said disk, fastened to the spring-drum of said return-spring, said ring being in constant contact with the other brush of said terminals, with means for automatically making and breaking the electric circuit between said ring and disk, said means consisting of a conductor on said disk, engaging the inner periphery of said ring, and adapted to make electrical connection between said terminals for stopping the same, by first checking the momentum of the electric motor, then bringing said electric motor to a final stop.

5. A type-writer having a paper-carriage,

a spring-motor for impelling the carriage in means for starting said electric motor, and

means for stopping the same by first opening the circuit for an instant, thereby checking the momentum of said electric motor, then closing the circuit, and again automatically opening the same for a longer period, Whereby the electric motor comes finally to a stop.

6. A type-writer having a paper'carriage, a spring-motor for impelling the carriage in its advance movement, a spring-motor for impelling the carriage in the opposite direction, an auxiliary electric motor for storing energy in said spring-motor, means for automatically starting said electric motor, and means for first checking the momentum and then bringing said electric motor to rest, said means consisting of two insulating-pieces of diiferent lengths within the inner periphery of the insulated ring fastened to the returnspring motor, and in line with the revolution of a spring-pressed conductor working within the outer periphery of and in electric contact with an insulated disk fastened to the shaft of said return-spring, whereby the momentum of said electric motor is first checked when the said conductor comes into contact with the shorter of theinsulating-pieces, and afterward the motor continues its winding until the said conductor comes into contact with thelonger of theinsulating-pieces, when the current is again out out and the motor finally comes to rest.

7. A type-writer having a paper-carriage, a spring-motor for impelling said carriage in its advance movement, a spring-motor for impelling the carriage in the opposite direcan abnormal torque and automatically red ucing said abnormal torque, thereby leaving the motor to continue its windings under the energy of the reduced torque.

8. A type-writer having a paper-carriage, a spring for impelling the carriage in its advance movement, a spring-motor for impelling the carriage in the opposite direction, an auxiliary electric motor adapted to restore the energy of the said return-spring, a cooperating pawl-lever adapted to release said spring-motor, a locking-arm holding said pawl-lever out of contact with said springmotor during the return of the carriage, a trip adapted to release said pawl from said locking-arm when the carriage has returned to the beginning of the new line, means for starting said electric motor under an abnormal torque, and means for automatically reducing said abnormal torque leaving the motor to continue its winding under the normal torque after the motor has been started, said means consisting of a circuit-breaker actuated by said pawl-lever controlling a relatively low-resistance circuit subsidiary to the main motor-circuit.

9. A type-Writer having a paper-carriage, a spring for impelling said carriage in its advance movement, a spring-motor for returning the carriage to the beginning of the line, an auxiliary electric motor for restoring energy to said spring-motor, and a switch in the base of said motor, whereby through different resistances the strength of the current supplied to the motor may be changed at the will of the operator.

In testimony whereof I afiix my signature in the presence of two witnesses.

NEAL LARKIN ANDERSON. Vitnesses:

W. R. MCDADE, B. GASTON.

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