US1792283A - Telegraph receiving apparatus for producing punched tape - Google Patents

Description

F. cs. CREED 1,792,283

Feb. 10, 1931.

TELEGRAPH RECEIVING APPARATUS FOR PRODUCING 'PUNCHED TAPE Filed y 14. 1950 s Sheets-Sheet 1 FIG. I

INVENTOR FREDERICK G. CREED ATTOR N EY TELEGRAPH RECEIVING A PARATUS FOR PRODUCING PUNCHED TAPE Filed May 14, 1930 v 3 Sheets-Sheet 2 FIG. 2

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I Bf E I ATTORNEY Feb, 10, 1931. F, G. CREED 1,792,283

TELEGRAPH RECEIVING APPARATUS FOR PRODUCING PUNCHED TAPE Filed'May 14, 1930 3 Sheets-Sheet 3 M B1 C1 D1 E1 A2 B2 02 D2 INVENTOR .7 razocmcnacnzsn BY l ATTORNEY Patented Feb. 10, 1931 UNITED STATES iaaaaae PATENT caries FREDERICK GEORGE GBEED, OF CROYDON, ENGLAND, ASSIGNOB 'I'O CREE-D AND COM- PANY, LIMITED, 0F CBOYDON, ENGLAND TELEGRAPH RECEIVING APPARATUS FOR PRODUCING PUNGHED TAPE Application filed Kay 14, 1930, Serial No. 452,367, and in Great Britain April 26, 1929.

This invention relates to telegraphic reproducing apparatus in which signal reproducing means is actuated by mechanical power under the control of received signals.

In apparatus of the class referred to distortion or prolongation of the elements of the received signals due to line conditions or other disturbing causes frequently results in the reproduction of false signal elements. This is due in part to the selective power of such apparatus to reproduce as normal elements such portions of the received signals as may be represented only by fractions of elements therein.

The present invention has for its main object to provide means to obviate such reroduction of false elements without impairing the reproduction of weak received elements and whilst retaining all the advantages of the use of mechanical power.

One embodiment of the invention will be described as applied to a tape perforating receiver for the production of a tape perforated according to the Morse cable code, but

it will be obvious that the invention is not limited to this, but may also be applied to a receiver perforating according to any multiple unit code, or to apparatus in which means is actuated instead to retransmit sig nals, according to any of aforementioned codes, to a second line.

In the accompanying drawings:

Figure 1 is a plan view showing one construction of a cable receiver embodying the present invention;

Figure 2 is a View, partly in section, taken on the line 2-2 of Figure 1;

Figure 3a side view of the receiver; I

Figure 4 shows a manner of constructing a resilient link which is preferably incorporated in the receiver as described;

Figure 5 is a sectional view of a detail, and,

Figures 6, 7 and 8 are diagrams for use in explaining the principle of the present invention.

In the example shown, 1 is the tape feed wheel and 2 the corrector wheel fixed on a spindle 3 driven through a friction coupling 4 and worm gearing 5 from a shaft 6. 7 is a corrector rod designed to co-act with the corrector wheel 2 for adjusting the rotary position of the feed wheell in the known way.

8 and 9 indicate two punches mounted to slide in a punch block 10 and the rear ends of which punches are inturned as shown at 11 and 12. 13 indicates a spring blade fixed at one end to a stationary part of the apparatus and bearing against the inturned rear ends 11 and 12 of the punches to return them to their normal positions after operation.

14 indicates a reciprocating bar carried by pivoted links 16 and 18 and reciprocated by a rotary cam device 20 through a roller 22 carried by the upper end of link 18 and engaging a cam groove 24 in the cam device 20. The bar 14, it is to be noted, is bifurcated at the end adjacent the link 16 which projects above the bar 14 for a purpose to be hereinafter explained.

Working in a second cam groove 34 in the cam device 20 is a second roller 32 carried by a pivoted link 30 to which is connected the rear end of the corrector rod 7.

The said cam device is adapted to be rotated by a spindle 35 rotated from any suitable power source, such as a motor, preferably through a safety spring device. On the spindle 35 is mounted a gear wheel 36 with which gears another wheel 38 carried by the shaft 6 and by which connection the latter is driven from the spindle 35.

This arrangement may be reversed, however, as will be readily understood, that is to say, the shaft 6 may constitute the main shaft of the apparatus and the spindle 35 be subsidiary.thereto and driven therefrom in any suitable manner.

The rotary motion of the cam device 20 is controlled by starting and stopping mechanism, including any suitable escapement device under the control of a non-polarized relay 40.

In the example shown, the escapement device comprises a three armed pawl 42 pivoted on a pin 44 within a recess 46 in a sleeve 48 attached to the cam device 20 and surrounding a ratchet wheel 50 fixed to the spindle 35 and a pivoted catch connected by a rod 52 to the tongue 41 of the relay 40. The pawl 42 .is held out of engagement with the ratchet wheel by the engagement of the pawl arm 54 with the catch but upon the receipt of a positive or negative signal relay 40 will momentarily withdraw the rod 52 and catch 55 from the pawl arm 54 and the pawl 42 will be caused to en age the ratchet wheel 50, under the action 0 its spring 56, so that the pawl, sleeve 48 and cam device 20 will be caused to make one revolution, whereupon the pawl arm 54 will be re-engaged by the catch 55 which will have been returned to its normal position, and the pawl thereby disengaged from the ratchet wheel and the motion of the cam device 20 arrested. In order to prevent the device-20 from being rotated in the wron direction, it is provided with a surface 57%iaving a depression into which is arranged to drop a roller 59 carried by a rod 61 under the control of a spring 63, the depression being steep on one side but not on the other so that rotation of the cam device in tihe right direction will not be interfered wit The unch selector consists of a bar 58 mounted to move transversely in front of the rear ends of the punches 8 and 9 and is provided, on the face opposite said punches with two spaced-apart recesses and 62 providing a striking segment 61. The punch selector is connected laterally to the tongue 64 or equivalent movable part of a polarized rela 66.

T e selecting bar 58 is preferably attached to the armature 64 of the polarized relay 66 in a resilient manner so as to prevent damage to the punches. For this purpose, in t e arrangement shown in Fig. 4, the selecting bar is bent as shown and the link 68, attached to the armature 64 of the relay at one end, passes through a ertures in the bent ortions of the selecting ar. Collars 70 ad ustably fixed to the link 68 retain springs 72 located on either side of the extremity of the selectin bar 58.

his arrangement is advisable since the aparatus described enables the instrument to he used for the reproduction of poorer signals than could previously be successfully reproduced.

Eccentrically pivoted to the top of a rotatable post 74, as by a pivot 76, is a lever 78, one end of which is connected to the rod 52 of the relay 40 and to the opposite end of which is pivoted, as shown at 80, a member 82. The member 82 is turned at its tip as shown at 84 and slotted see Fig. 2), the slotted portion embracing t e selector bar 58 and being slidably guided thereby in combination with a stationary stop or guide bar 86. The eccentric pivoting of the lever 78 permits of its adjustment and of that of the member 82 as will be readily apparent, the movement of the post 74 being conveniently efi'ected as by a projectin rod 79.

The non-p0 arized relay 40 is arranged to be operated by both positive and negative signals and is thereby operated to positively move the rod 52 and the catch 55 from and toward the pawl 54 each time a signal is re ceived. The polarized relay 66 is however arranged to operate to move the punch selector 58 in one direction only on the reception of a positive signal and in the opposite direction only on the reception of a negative signal.

The dot and dash punches are selected according to the position of the segment 61 of the selecting bar 58, the armature of the relay 66 moving the bar 58 so that said segment 61 is opposite either the punch 8 or the punch 9. On'the other hand, the non-polarized relay 40 moves its armature so that the catch 55 releases the pawl 54 of the escapement device, to permit the cam shaft to rotate through one revolution in the time of a signal period, and actuate the punch striking mechanism about the middle of the signal period through the medium of the link 14. This will cause the actuation of either the punch 8 or the punch 9 according to the position of the striking segment of the bar 58 in the manner presently to be described, that is to say, following a description of Figures 6 to 8 which it is now convenient to proceed with.

Referring to Figure 6, the vertical lines A,

B, 0,1), E, etc., represent signal periods and the full line may be taken as representing the letters F. I. as transmitted b an automatic transmitter in Morse cable co e. The signals will be received after transmission through a line or cable, substantially of the form shown in Fig. 7. If the distances of the horizontal lines I) and c, Fig. 7, from the zero line a be considered as the minimum values of signal strength to actuate or to hold actuated the non-polarized relay it will be seen it should have terminated. This case is shown diagrammatically on the termination of the second dot in the signal I in Fig. 7; the dotted portion of the curve representing the distorted signal and the full line representing the normal termination of the signal. It will thus be seen that instead of the non-polarized relay becoming de-energized at the point m and arresting the motion of the cam shaft by the clutch pawl 54 when the point C2 is reached the relay is not de-energized before point 12. By this time the pawl 54 will have passed the catch 55, the cam shaft will therefore make another complete revolution, and as the polarized relay although now de-energized, remains in the position to which it was last actuated an extra. perforation would be punched.

The present construction obviates such errors, and, the way is now clear to point out that the segment 61 will only 0 erate the selected punch when the tip 84 of t e member 82 is interposed between said segment and the projecting upper end of the pivoted link 16, which latter 1-5, of course, operated by the rod 14. Thus, when the non-polarized relay 40 operates on receipt of a signal, tip 84 of member 82 is inserted between the rod 14 and the selector bar 58 but when said relay returns on the completion of a signal, tip 84 of member 82 is withdrawn in view of the connection of the latter with the rod 52 and no motion of rod 14 can be imparted to the punches: Hence, referring again to the example of a distorted signal in Fi 7, it will be seen that although the shaft 0 the cam device makes another revolution, tip 84 of member 82 is now withdrawn at point p, which is before point as at which actuation of the punches would occur during that revolution of the cam shaft; an extra punch therefore cannot now be punched.

It will be appreciated that the invention can be variously constructed and as stated not limited to the above described example of a tape perforating receiver.

What is claimed is:

1. A. telegraphic receiver comprising slgnal receiving means, a rotatable member released under the control of signals received by said means, signal reproducing means and means also under the control of said signals for preventing any further effect of the continuing rotation of said member on said signal reproducing means after the cessation of a received signal.

2. A telegraphic receiver comprising a driven member, means for releasing said member for rotation at the beginning of each signal, and signal reproducing means actu ated during the rotation of said member, selected for actuation under the control of received signals and dependent for actuation upon said signals continuing to be received during such rotation.

3. A telegraphic reproducer comprising punches selectively actuated to reproduce signals, a rotating shaft, a punch actuating member driven towards said punches by said shaft, means interposed between said actuating member and said punches under the control of received signals to select the particular punch to be actuated and means, also under the control of said signals, interposed between or withdrawn from between said actuating member and said punches.

trol of the receive 4. A telegraphic reproducer comprising a relay, an armature therefor actuated in the same direction for both ositive and negative signals, a rotatable mem er adapted to be released and stopped under the control of said armature, signal reproducing means, a member adapted to be moved by said rotatable member to actuate said reproducing means, a polarized relay to select the particular reproducing means to be actuated, and an abutment moved by the first-mentioned relay between the signal reproducing means and said member at each actuation and Withdrawn at each release of said first-mentioned relay.

5. Telegraphic reproducin ap aratus comprising dot and dash unc selectin one of said unc es for operation, means or operating t e selected punch, and means interposed between said operating means and bar and withdrawable therefrom to prevent duplicate operation of the selected punch on the completion of a particular signal, all of said arts being under the con- 5 signals.

6. A cable receiver comprising a tape Wheel, a relay, a pair of punches selectable under the control of said relay, a constantly running shaft, punch actuating mechanism adapted to be connected to and disconnected from said shaft, a second relay controlling said punch actuating mechanism, and means interposed between said actuating mechanism and the selected punch to revent duplicate operation of the latter on i516 completion of a received signal.

7. A cable receiver, adapted to reproduce as perforations in a tape, signals according to the Morse cable code, comprising a pair of punches, a non-polarized. relay, punch operating mechanism adapted to be brought into action to punch a hole in the tape by said relay whenever a positive or negative impulse is received, a polarized relay, a punch selector movable by said polarized relay in one'direction upon the reception of a positive impulse and in the opposite direction upon the reception of a negative impulse, and a member under the control of said non-polarized relay preventing the duplicate o eration of the selected punch for any particular signal.

8. A telegraphic reproducer com rising a relay operated by the reproducing means,

means for actuating said signal reproducing means, means for selecting the particular reproducing means to be actuated, a second relay also operated by the received signals for actuating said selecting means, and resilient means interposed between said second relay and said selecting means to prevent damage to said signal re producing means.

FREDERICK GEORGE CREED. I

received signa 5, signal

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