US1987523A - Margin-regulating stop - Google Patents

Description

Jan. 8, 1935. H. BENZING MARGIN REGULATING STOP Filed Dec. 23, 1935 v l w In ren/on @fw Patented Jan. .8, 1935 UNITED STATES MARGIN-BEGUIATING S'IOll Hugo Benzing, Dresden, Germany, assignor Aktiengesellschaft vorm. Seidel & Naumann,

Dresden, Germany Application December 23, 1933, Serial No. 703,701

In Germany January 3, 1933 3 Claims. (Cl. 197-63) The invention relates to a device for limiting the commencement and the end of the line in connection with typewriters, calculating machines and the like,`in which margin-regulating stops co-operate with a ilxed stop, are guided on a common bar or each on a separate bar, and possess pawls movable by the ends of the carriage, the said pawls co-operating with teeth or notches in the guide bar.

It is the object of the invention to enable the adjustment of the device to be performed more rapidly, and to simplify the same in such fashion that for the purpose of making a new adjustment it is merely necessary, whilst moving a lever furnished for the particular margin stop, to move the carriage to the desired point. The idea disclosed by the invention is of particular value in connection with machines of so-called open construction, in which the margin-regulating means are usually arranged behind the paper feed plate, invisible to the person using the machine.

In the known devices of the kind in question, in which the margin stops, normally invisible to the person using the machine, are acted upon by a lever mounted on the carriage, it is necessary as regards alteration in the margin adjustment in the first place to press the lever, whereupon the pawl of the mar-gin stop is lifted from the rack, and secondly, when the lever has been pressed, to move the carriage wholly to the left if it is desired to move the right hand stop, or wholly to the right if it is desired to move the left hand stop, and thirdly not until the lever has been depressed to move the carriage into the position which is intended to be the marginal one.

By reason of the invention the adjustment is considerably facilitated by the fact that each of the movable margin stops is acted upon by a force which, after the pawl of the stop has been lifted from the teeth in the guide bar, moves it automatically up to the appertaining stationary stop. The lifting of the pawls of the margin stops from 'the teeth of the guide bar takes place preferably by means of an oscillatory actuating bar, provided separately for each margin stop and extending over the entire range of the margin stops.

According to the invention, each margin stop is acted upon by a working spring which, through the medium of a gear wheel, the teeth of which engage with the teeth of a guidebar preferably bearing at the same time the teeth for the pawls 0f the margin stops, is tensioned when the movable stop is moved away from the ilxed stop. The fixed axisof each of these gear wheels is surrounded by a drum-like casing, in which a spiral spring is so arranged that the same is tensioned as the margin stop moves away from the xed 5 stop. It would also be possible to employ springcontrolled cords or connecting rods or any other force with the same results.

In order that the positions of the stops of the margin-regulating means exactly coincide 1 with the conventional scale visible to the person using the machine, these stops, co-operating with the fixed stop, are, in accordance with the invention, made to be shiftable at the marginregulating members in the direction of movement 15 of the latter, 'and are adjustable by means of pressure screws.

A form of embodiment of the invention is illustrated in the drawing, in which the guide bar for the margin-regulating stops is mounted on the movable carriage, while the fixedv stop cooperating with the margin-regulating `stops is located at the middle of the rear wall of the frame of the machine.

Fig. 1 is a rear view of the guide bar and the margin-regulating stops.

Fig. 2 is a part plan view of the arrangement according to Fig. 1, and

Fig. 3 is an elevational view of the same.

On a guide bar 1 there are provided so as to be capable of sliding'thereon margin-regulating members 2 and .2. These members are exactly identical in reverse form. The following description refers to the margin regulating member 2 in Fig. 1 at the left. The corresponding parts of the right hand member 2' are furnished with the same reference characters having, however, an index. y

The margin-regulating'member 2 is U-shaped in cross-section (Fig. 3).4 The arms possess at 4) their ends small edges 2a bent off at right angles, so that the guide bar-1 is encompassed by the member 2 on all four sides. Beyond this the arms also possess at right angles to the direcpressure spring- 'l ensures engagement between the teeth 5 and 6 in the stationary position. Becured to the member 2 is a stop 13, which may be displaced in grooves 14, 15 parallel to the direction of movement of the member 2 and is held by means 'of pressure screws 16. The stops 13 and 13', in cooperation with a fixed stop 11, which is arranged at the middle of the rear wail of the machine and normally projects into the path of the said first stops, limit the path of operation of the paper-carriage. For the pawls 4 and 4' of each of the two members 2 and 2' there is provided in each case a yoke 18 or 18'. These yokes each .possess a bent operating lever 19 or 19'. The yokes themselves are mounted to rock on the side walls 20, 21, which also act as bearings for the platen, and are each acted upon by a spring' 22 or 22 tending to lift the yokes 18 or 18' from the pawls 4 or 4'.

The oscillation of the levers 19 or 19' caused by the springs 22 or 22 is limited by stops 23, 23' on the paper feed plate 24. In the stationary position the two yokes 18, 18' are Just suspended over the pawls 4, 4'.

On each member 2 there is also provid-1d a bearing 8 or 8' for the shaft 9 of a gear wheel 10 carrying a spring casing 11 having a spiral spring 25. The one end of the spring is anchored to the fixed shaft 9 and the other end to the casing 11, and the winding means for the spring is so chosen that the latter is tensioned when the stop 13 or 13' moves away from the fixed stop 17. The teeth of the wheel 10 co-operate with the teeth 12 of the guide bar 1.

The operation of the device is as follows: If the margin is to be altered, pressure is applied to the lever 19 (19') pertaining to the particular margin stop. The depressed lever through the medium of the yoke member 18 (18') rigidly connected therewith now acts on the surface 4a (4a) of the pawl 4 (4'), and presses the same downwards. In this manner the teeth 5 (5') move out of engagement with the teeth 6 of the guide bar 1, and under the action of the tensioned spring 25 in the casing 11 the marginregulating member 2 (2') moves towards the stop 17 and presses against the same. If now the carriage-the lever 19 (19') still being depressedis additionally moved in the direction of movement of the margin regulatorftheguide rod 1 slides through between the margin regulator, as the stop 17 prevents its operation until the lever 19 (19'), after the pressure on the same has ceased, has again been returned to its normal position by the spring 22 (22').

The teeth 5 (5') of thepawl 4 (4') are again able to engage with the teeth 6 of the guide bar l, and the margin-regulating stop is locked in the position at which the carriage was located at the moment when the lever i9 (19') was released. If the carriage is moved in the direction opposite to the direction of movement of the marginregulating stop, the guide bar is likewise able to pass through the margin member without moving the same, as the force of the spring 25 now maintains contact between the stops 13 (13') and 17, It is accordingly merely necessary, if it of the carriage in both directions, so that when r adjusting the margin it is unnecessary also to depress the known release lever additional to the lever 19 (19').

It will be understood that no restriction is made to the specic form of embodiment illustrated in the drawing, which has been quoted merely by way of example, and that numerous modifications are quite, possible within the meaning of the annexed claims and the above description without departing from the spirit of the invention.

What I claim is new and desire to secure by Letters Patent is: Y

1. A device for limiting the beginning and the end of a line on typewriters, calculating machines and similar machines comprising in combination, a shiftable rail provided with teeth, an abutment secured in fixed relation adjacent the rail, margin stops slidably mounted on said rail, s. ratchet carried by each stop and adapted to engage the teeth on the rail, means'releasing the ratchet, a spring adapted to automatically return the stop for engagement with the fixed abutment after the rachet has been released from the teeth. y

2. A device for limiting the beginning and the end of a line on twpewriters, calculating machines and similar machines comprising in combination, a shiftable rail provided with teeth, an abutment secured in xed relation adjacent the rail, margin stops slidably mounted on said rail, a ratchet carried by each stop and adapted to engage the teeth on the rail. means releasing the ratchet. a spring adapted to automatically return the stop for engagement with the xed abutment after the ratchet has been released from the teeth of the rail, a gear, one end of the spring having connection with the gear, the other end of said spring being connected to a fixed support, means on the rail engaging the gear for causing the gear to be revolved and for causing winding of the spring when the rail is shifted.

3. A device for limiting the beginning and the end of a line on typewriters, calculating machines and similar machines comprising in combination, a shiftable rail provided with teeth, an abutment secured in fixed relation adjacent the rail, margin l stops slidably mounted on said rail, a ratchet carried by each stop and adapted to engage the teeth on the rail, means releasing the ratchet, an adjustable abutment projecting laterally from each stop, a spring adapted automatically to return the stop so that the adjustable abutment will engage i the fixed abutment after the ratchet has been released from the teeth of the rail, and means for causing the spring to be wound when the rail is Y

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