US2297383A

US2297383A - Differential mechanism foe cash

Info

Publication number: US2297383A
Authority: US
Publication date: 1942-09-29
Anticipated expiration: 1959-09-29

Description

B. BERIA Sept. 29, 1942.

DIFFERENTIAL MECHANISM FOR CASH REGISTERS I Original Filed March 28, i936 Patented Sept. 29, 1942 UNITED STATES PATENT OFFICE DIFFERENTIAL MECHANISM FOR CASH REGISTERS Biagio Beria, Turin, Italy; vested in the Alien Property Custodian 2 Claims.

This invention is a division of application Serial No. 71,522 filed March 28, 1936 by the same applicant and relating to a cash register comprising a main shaft and a driving member for each row of amount keys, which perform in a first period of the operation a forward rotation and in a second period of the operation a backward rotation over a constant extent, whereby each driving member moves a wheel setting the wheels of the totalizer, the indicator and the type wheels by an extent which is proportional to the value of the depressed key.

One object of the invention is to provide a device of simple construction and dependable working to transmit to the setting a wheel a rotation in one direction through an angle corresponding to the depressed amount key.

Another object of the invention is to provide an actuating device for each setting wheel comprising a rockable arm carrying a hook-shaped beam having a key-controlled pawl so arranged that during the forward movement of the arm, the hook-shaped beam is kept free from the setting wheel, while during the backward movement the hook-shaped beam is carried by the depressed key into engagement with the setting wheel, which is carried along in motion to effect the desired adding operation.

A further object of the invention is to provide suitable means to positively maintain the hookshaped beam in engagement with the setting wheel during the adding operation.

A further object of the invention is to provide suitable means for disengaging the hook-shaped beam from the setting wheel at the end of each adding operation.

Other objects and advantages of the invention will appear from the following specification with reference to the annexed drawing, in which:

Fig. 1 is an elevation view of the advancing arrangement disengaged from the setting wheel, and

Fig. 2 is a partial View of Fig. 1, showing the advancing device in engagement with the setting wheel.

Referring to the drawing, denotes a bedplate and 2 a cover plate. A driving shaft 3 is mounted on the baseplate and carries a double cam I2 and I3, on which ride the rollers l4 and I5 of a lever l6 pivoted on the stationary pivot H. A lever I8 is pivoted to the lever I6 and is connected by its upper end to the arm is keyed on the main shaft 20. By this arrangement, the main shaft 20 receives in the first period of each turn of the driving shaft 3 an oscillation in the direction of the arrow A of Fig. 1 (return stage) and in a second period of the same turn an oscillation in the opposite direction (arrow B) (actuating stage), each oscillation extending over about 66.

A keyboard comprising as many columns of nine keys 5 as required by the importance of the amounts cashed is arranged on the cover plate. A setting wheel 2| loosely mounted on the main shaft 20 is provided for each column of keys.

Beside each wheel 2| an arm 23 is keyed on the shaft 20 and rotates in the second period the respective setting wheel 2| through an angle according to the position of the key 5 depressed in the corresponding column. For this purpose each setting wheel 2| carries attached thereto a segment comprising nine teeth 22 extending over a portion of the periphery somewhat smaller than the angle of oscillation of the main shaft 20, for instance over each tooth 22 bein opposite a key 5 of the respective column. A beam 25 is articulated to the free end of the arm 23 and its end forms the hook 26 which cooperates with the teeth 22. A pawl 21 is articulated to the beam 25 in proximity to the hook 26 and is subjected to the action of a spring 26 tending to bring a projection thereon against a stop 28. During the first period as the arm 23 oscillates in the direction of the arrow A, the beam 25 passes between the keys 5 and teeth 22 without the hook 26 becoming engaged by one of the teeth 22, even if one of the keys 5 is depressed. The pawl 27 riding in this direction yields on meeting a lowered key 5. If, on the next oscillation of the arm 23 (arrow B, second period) the pawl 21 meets a depressed key 5, the pawl cannot yield being withheld by the stop 28 on the beam 25. As the arm 23 moves further (Figure 2), the beam oscillates causing the hook 26 to be engaged by the tooth 22 corresponding to the depressed key 5. The setting wheel 2| is carried along by the arm 23 on the remainin portion of the oscillation of the arm 23 till, towards the end of the second period, the hook is released I from the tooth 22 by the following mechanism:

An arm 24 is loosely mounted on the hub of the arm 23 (Figs. 1, 2) and its free end is formed with a out between the

extensions

30 and 3|, said out engaging the pin 29 attached to the end of the beam 25 opposite the hook 25. The extension 3| forms the step 32. A spring 33 is stretched between the pin 29 and an extension 34 of the arm 24. The arm 24 is carried along by the arm 23 during the first period in which the arm 23 oscillates in the direction shown by the arrow A, for the pin 29 meets the extension 30; during rotation in the direction of the arrow B (second period) the arm 24 is carried along by the pin 29 which abuts the extension 3| below the step 32. On depression of a key 5 the hook 26 is engaged by a tooth 22 (Figure 2) and the pin 29 oscillates outwardly to the level of the step 32 and, under the action of the spring 33, the arm 24 is drawn nearer the arm 23 while the pin 29 comes to bear on the step 32. The engagement between the hook 26 and tooth 22 is maintained and both arms oscillate further together in the direction of the arrow B. At the end of the oscillation the arms 24 pass under a pawl 35 (Fig. 1) rockably mounted on the shaft 38 and operated by the cam 40 on the main shaft 3 through the lever 40a, link 40 lever 40c, pawl BI and link 62 in such manner that its lower end is lifted (position shown in dotted lines in Fig. 1) when the

arms

23, 24 perform their oscillations. When the

arms

23 and 24 have finished their second period oscillation and resume their initial position, the pawl 35 is caused to oscillate to the position shown in full lines in Fig. 1, pushing away the arm 24 from the arm 23 in the direction of the arrow B. The pin 29 thus set free from the step 32 snaps under the action of the spring 33 causing the hook 26 to become released from the tooth 22.

When, during the first period of the next operation, the arm 23 is oscillated in the direction of the arrow A, all the setting wheels are returned to zero by an extension 36 on the arm 23 which abuts an abutment 31 provided on one of the spokes of the setting wheel 2|.

When no amount key 5 is depressed in the column, the respective setting wheel 2| remains stationary, The oscillation performed during the second period proportional in extent to the value of the amount (actuating stage) is transmitted to a general totalizer and, if desired, to one of a number of partial totalizers, to printing rollers and indicator wheels. For this purpose each setting wheel 2| is provided with a set of teeth 45.

What I claim is:

1. In a differential mechanism for a machine of the class described, the combination of amount-keys, comprising, for each order, a setting wheel, a rockable arm, a hook-shaped beam articulated on said arm, a key-controlled pawl on said beam engaged by a depressed key during swinging movement of the arm in one direction to bring the hooked beam into engagement with the setting wheel, a loose arm, a projection on said hooked beam, a stepped notch on the loose arm receiving said projection, the step of which being capable to hold the hooked beam into engagement with the setting wheel, a spring interposed between the loose arm and the projection for moving the step under the projection when raised by the pawl bringing the beam into engagement with the setting wheel, and means for moving the step out from under the projection, whereby the spring disengages the hooked beam from the setting wheel.

2. A machine according to claim 1, in which the means for moving the step out from under the projection comprises a push member, a shaft, a lever, a linkage connecting said push member and lever, and a cam on the shaft acting on said lever for pushing said member against said loose arm at the end of the oscillation.

BIAGIO BERIA.