DE2056564A1 - Line switching device for power-driven typists and similar machines - Google Patents

Description

IBM Germany Internationale Büro-Maschinen Gesellschaft mbH

Boeblingen, November 13, 1970 wi-sk

Applicant: International Business Machines

Corporation, Armonk, N.Y. 10

Official file number: New registration

File number of the applicant: Docket LE 968 039

Line feed device for powered typewriters and similar machines

The invention relates to a line switch device for power-driven writing and similar iöschinen with a drive motor acting on the paper guide and a locking device defining the angular position of the paper guide. The line switching device according to the invention is intended in particular for typewriters and printing units that are used for lettering forms or large sheets of paper, e.g. sheets of drawings, are provided. The invention is further below on one Typewriter will be explained, which is intended for the lettering of drawings in larger format and accordingly is equipped with a movable paper carriage and a printing station which can be advanced along the printing line.

Docket LE 968 039

10 9 3 2 2/1318

Finding a surface area on a larger sheet for printing purposes is usually a manual function both with office typewriters and with drawing machines. In the case of electric typewriters in particular, it is already known to provide a step-by-step line switch that can be triggered by means of a function key, and continuous feed drives are already known for machines that process forms. The present invention solves the problem of accomplishing both the step-by-step line switching and the continuous w feed by means of a single motor that can be switched on by function keys. The solution to this problem is characterized by at least one first Stellylied, which is connected to the motor for different, continuous line switching steps via first switching means, at least one second actuator for setting a step-by-step line switching, a line switch connected to the motor via a clutch and with the Second switching means connected to the second actuator for switching on and automatically switching off the motor regardless of the position of the first switching means.

| Embodiments of the invention are based on the following of the drawings.

In the drawings show:

Fig.l is a perspective view of a typewriter with separate power drive for line switching;

2 shows a circuit diagram of the control circuits of the line switching device;

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FIGS. 4a-4e show different positions of part of the line switching device shown in FIG. 3;

FIG. 5 shows another embodiment of a part of the line switching device shown in FIG for either half or full line spacing.

In Fig.l is a typewriter 10 with a keyboard 11 and a type carrier 12 shown, with a paper guide 13 with a laterally displaceable writing carriage 14 in which a Platen 15 is mounted. In addition, the type carrier 12 is also positioned along the platen 15 by means of a carriage movable. By moving the writing carriage sideways

14 the different areas of a very large sheet of paper P can be labeled with the type carrier 12, for example for labeling technical drawings up to one Paper width of 120 cm. To print consecutive lines or to go to different areas for printing, the platen is used to feed the paper P vertically

15 rotated. This paper feed is controlled from the keyboard 11 via a forward line shift key 16 and a backward line shift key 17 as well as a fast feed key 18 and a normal feed key 19 controlled and controlled by means of a reversible, self-starting designed as an alternating current motor motor 20 causes.

The motor 20 is coupled to the platen 15 via a gear transmission 30, consisting of a pinion 31, a Intermediate gear 32, another on a square shaft 34 on the carriage 14 displaceably arranged gear 33, a Pinion 35 and further gears 36, 37, 38 and 39, the gear 19 being coupled to the platen 15. On the opposite At the end of the platen 15 there is a latching device 40 (see also FIG. 3) with a line index wheel 41,

Docket LE 968 039 109822/1318

a locking roller 42 resting under spring force and a control device 43.

via the line keys 16 and 17 and the speed control keys 18 and 19 the running time, speed and direction of rotation of the motor 24 are controlled via a number of secondary M> gate control switches, namely a direction control switch 21 and further switches 50, 60, 61, 44, 22 and 23. The direction of travel control switch 21 and switch 23 are normally moved forward by a tension spring 24 assigned position held. The switch 23 is therefore normally open. The direction of travel control switch 21 is connected to the forward winding 25 of the gate 20. If via the keyboard 11 by closing the switch 62 or the switches 51 or 52 by means of the switches assigned to them Buttons 17, 18 or 19 the reverse direction is set a relay 26 is actuated. As a result, the switch 23 is closed and the direction control switch 21 for connection actuated with the forward motor winding 27.

The switch 50 is normally open and thereby prevents the motor 20 from starting. The clutch control switch 64 is open also normally open so that the clutch actuation solenoid 63 (see also Fig. 3) is switched off. The switches 50 and 61 are closed by the relay 53, after pressing the cutting feed key 18 or the Normal feed key 19 via the contacts 51, 52,54 or 55 responds. After closing the clutch control switch 61 after a short delay caused by a capacitor 56, the electromagnet 63 is actuated, which controls the switch 44 closes and the clutch 64 (Fig. 3) disengages. By closing the switch 44, the electromagnet 45 (Fig.3) excited the control device 43, which rotates the toggle lever 46 counterclockwise about its storage and the Ring 47 axially moved away from the line index wheel 41, whereby the line index wheel 41, which is normally engaged, is excluded

109622/1318

Docket LE 968 039

- 5 comes into engagement with the platen 15.

The speed of the motor 20 is controlled by a control circuit (Fig.2), which the power supply from the AC input 71 to the output lines 71a periodically interrupts as required to raise the engine speed to keep the desired value. The output lines 71a are connected to the selected active motor winding 25 or 27 via the switch 21. The circuit 70 is connected to a speed sensor connected, which is designed, for example, as a generator coil within the MDtors 20, in which one on a the voltage divider 73 or 74 tapped control voltage Ec is induced. The voltage divider 73 is closed by closing one or the other of the contacts 75 and 76 is placed in the control circuit and the voltage divider 74 by closing one of the contacts 77 and 78. A resistor 79 is constantly in the circuit and controls the speed during step-by-step Operations when none of the keys 18 or 19 are pressed. The circuit 70 operates when the voltage is increased Ec a temporary interruption of the current flow to the motor 20 via a predetermined threshold value. If its speed has set to the setpoint, the current flow is initiated again. It can of course also be another known one Motor control can be used.

The switches 22 and 60 are normally open and are closed when an electromagnet 65 (Figure 3) is actuated, as a result of either the switch 66 or the switch 62 being closed by means of the keys assigned to them 16 and 17. A line switch switch 80 (Fig. 3) controls this open the switches 22 and 60 after measuring a predetermined line switching angle of the platen 15. The Line shift encoder 80 comprises a disk 81 which is normally rotatably coupled to motor 20 via clutch 64.

Docket LE 968 039 10 9 8 2 2/1318

The electromagnet 63 is connected to a coupling arm 67, which, against the force of a spring 68, interrupts the mechanical connection given by the clutch 64, if a larger one Paper advance is desired.

The disc 81 contains a pair of slots 82 which define the home position define the disc. A sliding control arm 83 is normally supported by one of the slots 82 and moves under the action of a spring 84 up to a stop defined by the slot 82. In

in this position the switches 22 and 60 are activated by the finger

85 of the control arm 83 is open. The control arm 83 is moved by.; U electromagnet 65 against the force of the spring 84 to the left

pulled out of the slot 82. The electromagnet 65 is connected to the control arm 83 via a locking mechanism with a pawl 86, which is pivotably mounted at an angle 87 and counterclockwise against one end of a toggle lever which is hinged to the control arm 83 and is normally biased clockwise by a spring 89 is. When the pawl 86 is pivoted, it comes under the shoulder 89a of the toggle lever 88 and thereby interrupts the connection between the electromagnet 65 and the ™ control arm 83. The control arm 83 can then under the action the spring 84 return to the right to its normal position. Since the leftward movement of the finger 85 den Switch 60 closes, the motor 20 starts immediately and thus brings the slot 82 out of its position of alignment with the control arm 83. As a result, the control arm 83 cannot return fully to the right, although it is off the pawl

86 is released.

As shown in FIGS. 4a to 4e, a locking device is used 90 to ensure that the control arm 83 does not come back can enter the slot 82 before the motor 20 has made a greater angle of rotation. The locking device 90 contains a radial arm 91, which relative to the disc 81 Docket LE 968 039 109822/1318

is rotatably arranged between a pair of stops 92 and 93, extends radially beyond the disk 81 tmd has an end 94 at which the arm 91, as later described, can be operated. A pair of leaf springs 95 act against a corresponding pair of lugs 96 of the ratchet 90 to align the arm 91 with the slots 82. In Fig.4a the disc 81 and the control arm airid 83 shown in a position that of the one shown in FIG is equivalent to. The right leaf spring 95 forces the arm 91 clockwise upward against the control arm 83. When the Control Arai 83 withdrawn by the electromagnet 65 (Fig.3) (FIG. 4b), the arm 91 immediately rotates clockwise under the action of the leaf spring 95, around the slot 82 to cover. Even if the control arm 83 were immediately released so that it could snap back to the right, it would he cannot enter the slot 82 because of the arm 91. As shown in Fig. 4c, the rotation of the disk 81 stalls by the motor 20 the slot 82 clockwise and enables the application of the control arm 83 against the peripheral Edge of the disk 81 under the action of its spring 84. The same condition exists when the disk 81 rotates continues and the second of the slots 82 approaches the control arm 83, as shown in Figure 4d. The control arm 83 hits on the end 94 of the arm 91, as shown in Figure 4e, moves it from its position over the slot 82 and allows the re-entry of the control arm 83 into the slot 82 under the influence of the spring 84 in a rightward movement. This is the one shown in Figure 4a State restored. Immediately after the rightward movement of the control arm 83, the switch 60 opened to terminate the flow of current to the motor 20 and stop its rotation. The angle that the motor 20 has passed through during the rotation of the disk 81, corresponds to the movement of the platen 15 by one line spacing. It it can be seen that because of the symmetry of the arrangement with the disc 81, the control arm 83 and the locking device Docket LE 968 039 10 9 8 2 2/1318

90 the distance measurement in both the forward and backward directions is carried out essentially identically.

The actuation of the SchneiIvorschub button 18 in the direction of their operative position F closes the contacts 54 and 76 (FIG. 2). The contact 76 selects the voltage divider 73 to control the Mortar speed on fast feed. Contact 54 switches by closing the switch 50 by actuating the relay 53, the motor and separates the line switching wheel 41 from the platen 15 by exciting the electromagnet 45 by closing the switch 61 and by the delayed Closing the switch 44. When the writing zone is reached, the fast feed key 18 is manually in its middle, inoperative position reset, whereby the switches 54 and 76 are opened for the purpose of opening the motor through of the switch 50 and switch off by the relay 53 dropping out. The electromagnet 63, the line switch switch 80 by disengaging the clutch 64 has switched off, drops after a delay determined by the capacitor 56 and is thus restore the facility to its normal, gradual operating mode. After the electromagnet 63 falls, the switch 44 opened and the platen 15 again with the line index wheel 41 connected.

The normal feed is achieved in a similar way by pressing button 19 in its forward operating position "V", whereby contacts 55 and 78 are closed. The difference in operation lies in the choice of the normal feed voltage divider 74 by means of the contact 78 to allow the motor 20 to run slowly. If faster or slower more continuous Reverse is desired, the appropriate switch, e.g., button 18, is set to its labeled "R" Brought operating position and the contacts 51 and closed. In addition to the choice of the high-speed voltage divider 73 and switching on the motor

109822/1318

LE 968 039

Closing the switch 50 as previously described energized the contact 51 also the relay 26 to the direction of travel switch 21 to switch to the reverse winding 27 of the motor 20. Furthermore, the contact 54 also sets the switch 21 around when the key 19 is brought into its position marked "R" will.

Depression of the forward cursor key 16 toggles the motor 20 at a speed controlled by the resistor 79. The M) gate 20 is, however, closed by closing of the switch 60 is energized by energizing the solenoid 65 when the step-up switch 66 is closed will. In connection with FIG. 3 it was mentioned that the electromagnet 65 pulls the pawl 86 against the toggle lever 88, to withdraw the control arm 83 from the slot 82 in the disc 81. This withdrawal movement closes the switch 60 and turns on the motor 20 by means of the forward winding 25. The electromagnet 65 is automatically separated from the control arm 83, when the pawl 86 swings downward, free from the toggle shoulder 89a. The control arm 83 thus comes free to return to the right under the influence of the spring 84, although such movement is provided by the arm 91 (Fig. 4b) or the disk 81 (Flg.4c) is prevented. The switch 60 is therefore kept in its closed state, even when the Electromagnet 65 has fallen off. As the disc 81 is rotated, the arm 91 hits the side edge of the control arm and is offset away from the slot 82 (FIG. 4d). The control arm 83 can collapse into the slot 82 when the disc 81 is at its Starting position reached. This movement opens switch 60 to stop motor 20. Would be the reverse row switch button 17 had been pressed, the operation would have been similar except that the electromagnet 26 was also depressed would have been actuated to change the direction of travel switch 21 and thus the reverse winding 27 of the motor 20 to make it effective. The switch 23 would also be through the electrical

Docket LE 968 039 10 9 8 2 2/1318

- ίο -

magnets 26 have been closed so that when the Switch 22 formed by the electromagnet 65, a holding circuit via the switches 22 and 23 to the electromagnet 26 would have been in order to keep this energized until the end of the operation by opening the switches 60 and 22.

FIG. 5 shows a modification of the device according to FIG shown, with which either a half or a full vertical line break can be carried out. Half carriage return may be desirable, for example, when printing indices or exponents, or when printing fractions such as. The device according to Figure 5 contains a line switch switch 80 ', which is similar to the encoder 80 in Figure 3 and includes a modified disc 81 'which four defined by slots 82' Can assume starting positions. The rotation of the disk 8l ″ between adjacent starting positions corresponds to one half line spacing, while the rotation between opposing slots is full line spacing. A Modified arm 83 'is driven directly by an electromagnet 65 'is actuated after either a full or half forward or reverse carriage return operation has been initiated. To select a full or half line separator

"Standes is a feedback device with the disc 81 · connected, which has a magnetic surface 101, which in four Zones 102 separated from one another by sharp transitions 103 are magnetized. Next to the magnetic surface 101 in the field of the magnetic zones 102 is a normally closed reed switch 104 with a suitable selective counter 105 is connected and the movement of the disc 81 'by opening when passing each of the transitions 103 indicates. The transitions 103 are approximately 45 ° out of phase with reed switch 104. As a result, the half-line mode falls the electromagnet 65 * is released for the first time when the reed switch 104 is opened. This allows the spring 84 ', the arm 83 'to pull against the disc 81 *, where it is in the next

Docket LE 968 039 10 9 8 2 2/1318

Slit 82 'falls and the opening of switches 60 and 22' allowed the switches 60 shown in FIGS and 22 correspond. If full line switching is selected, the electronic counter 105 is set so that the electromagnet 65 'is held energized until the reed switch 104 opens a second time. Then the disc 81 'can be the first Rotate slot 82 'past arm 83'.

Docket LE 968 039 10 9 8 2 2/1318

Claims (10)

Claims Line switch device for power-driven writing and similar machines with one on the paper guide acting drive motor and a locking device defining the angular position of the paper guide by at least one first actuator (18,19) / that for different, continuous Line switching steps via first switching means (50) with the MDtor (20) is connected, at least a second Actuator (16, 17) for setting a step-by-step line switch, one via a coupling (64) to the Motor (20) connected to the line switch (80) and connected to the second actuator (16,17) second Switching means (65, 60) for switching on and automatically switching off the motor (20) regardless of the position the first switching means (50). 2. Line switching device according to claim 1, characterized by a latching control device (43) with switching elements (45,46) for making the latching device ¹ (40) effective or ineffective, which is always effective when w the first actuator (18,19) is not actuated. 3. line switching device according to claim 1, characterized in that that the first actuator (18, 19) can occupy two working positions, the forward or reverse of the motor (20) are assigned, and that a corresponding to the position of the first actuator (18,19) adjustable direction switch (21) is provided. 4. line switching device according to claim 3, characterized in that the direction switch (21) via a relay (26) by the second actuator (16,17) and the motor (20) thus independently of the Cover LE 968 039 109822 / $ 131 Position of the first switching means (5Q) can be set to forward and reverse. 5. line switching device according to claim 1, characterized in that that two first actuators (18 and 19) and a speed-proportional voltage (Ec) supplying Tachometer (72) are provided, and that the voltage (Ec) by means of the actuators (18,19) selectively switchable voltage divider (73,74) is fed to a control circuit (70) which is connected to the motor (20) is connected. 6. line switching device according to claim 1, characterized in that that the line switch switch (80) is a rotatable Has disc (81) which can assume at least one rest position per revolution, and that a sensor (83) is provided that actuates the switching means (22, 60) assigned to it when the disc (81) assumes a rest position . 7. line switching device according to claim 1, characterized in that that the line switch (80) is connected to the motor (20) via a coupling (64), which by means of a spring (68) is normally held in the engaged state, and that an actuating member (63,67) is provided which can be actuated via the first actuator (18, 19) to disengage the clutch (64). 8. line switching device according to claim 6, characterized in that that the disc (81) has two slots (82) into which the sensor (83) can enter if one the slot (82) is aligned with it with a half turn of the disc (81) taking a full line pitch is equivalent to. 109822/1318 Docket LB 968 039 9. line switching device according to claim 6, characterized in that that the disc (81) has four slots (82) and that the angle between adjacent Slitting (82) corresponds to half a line switching step. 10. line switching device according to claim 9, characterized in that the disc (81) is assigned a magnetic surface (101) with magnetic zones (102) that in the magnetic field of the zones (102) is assigned a reed switch (104) which is associated with a Counter (105) is connected, and that the counter (105) for signaling half and whole line switching steps is connected to an electromagnet (65 *) which ^{actuates the sensor (83 1).} Docket LE 968 039 10 9 8 2 2/1318