DE419315C - Device for deleting and locking the keyboards on calculating and adding machines - Google Patents

Description

Device for deleting and locking the keyboards on computing and Addition machines. There are erasing devices for the keyboards of computing and Addition machines are known in which the key lock rails are triggered that a fixed tooth on the drive shaft cooperates with a lever lock. These devices are suitable for machines in which the drive shaft is only in is rotated in one direction.

In calculating and adding machines, however, where the drive shaft for performing the various arithmetic operations in one way or the other Turned direction "must be grounded, is the deletion of the key lock bars by a Fixed tooth on the axis is not possible, since the deletion always occurs during the last Part of the rotational movement of the shaft must take place in one sense or the other.

The purpose of the invention is now to create an extinguishing device, those for clearing the keyboards both in the rotation of the drive shaft in one as well as in the other direction can be used, at the same time a device to lock the keyboard is provided to prevent the keys of the keyboard can be adjusted when the drive shaft moves out of its zero position which is sure to prevent false results.

This is achieved according to the invention essentially in that when rotating the drive shaft by a driver or the like connected to it. with the mediation of a tooth that can be loosely rotated on the axis by means of a lever transmission the deletion of the keyboard and by a fixed on the drive shaft, whose Rotation participating cam disables the locking of the key lock rails as a function of from the action of the extinguishing device and the lifting of the key lock bar.

In the drawing is an embodiment of the device according to of the invention, and it is: Fig. i is a partially sectioned view of the device with the drive shaft in the zero position, Fig. 2, one similar to Fig. i View in which the drive shaft has been moved out of the zero position.

On the drive shaft 23, which is used to rotate it, for example with a crank? can be provided, sits a cam 2.1 with a projection g. A tooth 15 is loosely mounted on the shaft 23 or, better, on the hub of the cam disc 2.1, and the disc 2.1 carries a driver pin 25 is pulled in the direction of the shaft 23. The end of the double lever 16 facing away from the shaft works together with an angle lever 2o which is rotatably mounted on the frame 26 and which, in a known manner, pushes back the key lock rails 2 upon completion of the arithmetic process; to clear the keyboard. Behind the key lock rails 2, an angle lever ii is also rotatably mounted on the frame 26 of the machine, the arm 2, 9 of which is rotatably connected to a pull rod 29. The rod 29 is slidably arranged in bearings 30 and is constantly pressed against the cam 2.1 under the action of a spring 31. The rod 29 could of course also carry a shoulder or a roller at its free end, which runs in a curve of the disk 2: 1, in which case the spring 31 can then be omitted and the movement of the angle lever it inevitably takes place.

The mode of operation of the new device is briefly as follows: If the Crank? rotated, the disk 2.1 rotates with it. Tooth 15 retains its downward position until the Mitnehnierstift 25 of the disc 2.1 hits tooth 15 as it rotates. From that moment on it takes the tooth 15 also participates in the rotation of the disk 24 and finally comes towards the end of lever i6, lift it so that (the other end moves downwards and thereby in a known manner (read erasure. As soon as the crank 7 is moved out of the zero position, the approach 9 of the cam 24 comes out Contact with the rod 29, causing this under the action of the spring 31 to the left is shifted in the sense of Fig. i and assumes the position shown in Fig.2. As a result, the angle lever i i is rotated so that its free arm against the key lock rails 2 lays down and this, as shown in Fig. 2, is locked against displacement. With the further rotation of the crank 7, the extension 9 finally comes back to lie against the rod 29 and press it against the action of the spring 31 back to the position illustrated in Fig. i, so that the free end of the bell crank 28 is brought out of the path of movement of the key lock rails.

The same mode of operation of the locking device results, of course, when, as indicated above, the rod 29 is forcibly moved back and forth.

Of course, the driver pin 25 with reference to the approach 9 of the disc so that the key lock is disengaged, before the keyboard is cleared.

Claims (3)

PATENT CLAIMS: i. Device for erasing and locking the keyboards on calculating and processing machines, characterized in that when turning the drive shaft (23) by a Mitnelimer (25) or the like connected to this under mediation a tooth (15) that can be rotated on the drive shaft.less by means of a lever transmission (16, 17, 2o) causes the keyboard to be deleted and by one on the drive shaft fixed cam disc (9, 2.1) that participates in its rotation, the locking of the key lock rails (2) depending on the effectiveness of the extinguishing device and the lifting of the blockage the key lock rails. 2. Device according to claim i, characterized in that that the local position of the deletion by pushing back the key lock rails (2) organ causing the cause (driver 25) to which the blocking or lifting the blocking causally initiating organ (cam plate g, 2.1) is such that the deletion takes place by pulling back the key lock rails and that the cam (9, 24) has unlocked the key lock rails in that angular position the drive shaft in which (read the driver element (25) begins, the key lock rails to move in the sense of deletion. 3. Device according to claim i, characterized in that that the blocking of the key lock rails by a movable organ such. B. a Angle lever (i i), a rail or the like., Is carried out by a counter to the Effect of a spring or a rod that is inevitably moved by the cam disk (9, 2q.) (2g) is shifted.