DE1101781B - Writing device with reciprocating stylus for generating recordings on paper sensitive to electrical current - Google Patents

Description

Writing device with a stylus moved to and fro for generating of records on paper sensitive to electrical currents When writing Short-term measuring devices for echo sounder purposes and other types of recording devices with one Writing member attached to a support guided along a rectilinear path is and alternately moved back and forth by engaging drive means on the carrier is, whereby only when the writing member runs out, records are made on a writing strip are to be generated, it is known that the writing member by pivoting when reversing lift off the guide of the writing member carrier from the writing surface. To this end are those for driving and controlling the direction of movement of the writing member serving means coupled to the device for pivoting the guide that the writing member is lifted from the writing surface during the return movement. This connection two devices to be operated in a certain time-dependent manner and the pivoting design of the guide of the writing link carrier are in some Cases undesirable for design reasons. One has further with writing implements with an alternately to-and-fro writing member, which during its run should be effective and ineffective on return, a writing link in the form of a toothed wheel provided, which is constantly pressed against the writing surface and through the outward run a lock is prevented from rotating while it is reversing on .the writing surface unrolls. Such a thumbwheel is not suitable for generating records on electrically sensitive paper, for which a fine wire is used as a writing link has proven to be most suitable.

In order to avoid scratching the writing surface, a Writing wire in known recording devices, seen from the writing tip, arranged inclined in the direction of its approach to the writing surface. At a Such an arrangement there is a risk that the writing tip when reversing in hooked on the paper of the writing strip, so that it is absolutely necessary that the Lift the writing tip off the paper when reversing.

The object of the invention is to create a writing link carrier attached device that is independent of the movement of the writing member carrier alternately serving in opposite directions is and in the immediate vicinity Depending on the direction of movement of the writing member carrier during the outward run that Lets the writing member rest on the writing surface and when it returns from this takes off.

In a writing device for generating records for electrical current sensitive paper by means of a preferably sharp one Pointed and when writing in the direction of its movement against the writing surface inclined writing pen, which is in constant orientation to the writing surface guided by means of a force conductor alternately moved to and fro handlebars is carried, during the steady trajectory of which records are generated and after overflowing the paper it returns to the starting position with a reversal of movement is fed back, in particular for short-term measuring devices, according to the invention is a to be overcome during the movement of the stylus carrier by means of the force conductor the frictional force generated on the guide part of the pen support or on the writing surface dimensioned so that the movably mounted on the stylus support, with one arranged on this Manual transmission connected stylus by the action of changing Direction of the driving force acting on this gear or the driving force opposite to it Frictional force is influenced in such a way that it comes to rest on the writing surface is brought and is lifted off when it returns.

A device according to the invention can for example in the manner be designed that a movably connected to the pen support mechanical Switching element rests resiliently on the paper or the guide of the switch handle carrier and the frictional force that arises when sliding the pen back and forth is operated in the opposite sense. The stylus is alternating brought to resilient contact with the paper and lifted from it. In a way the reverse of such a device is an arrangement in which the Pen carrier taken along by a reciprocating force transmission member is that with the carrier indirectly, via a mechanical mounted on this Switching element is connected. As the direction of the driving force for the pen support reverses with the direction of movement, the switching element is turned back and forth operated in the opposite sense. The pen carrier is here with a Friction brake effective for both directions of movement. Through appropriate Dimensioning the braking force is to achieve that switching the stylus every time takes place before the start of the outward or return journey. Here as with the other institutions In the embodiment of the invention, a stroke limiter is to be provided for the switching element. In particular, this creates a very specific contact force on the resilient stylus ensured on the paper, and also thereby the pen holder takes on Outgoing a very specific position in relation to the force transmission member. The power transmission link can be made from a tensioned cord that is wound and unwound from rollers Swing arm or the like, oscillating back and forth by a cam disk.

Another embodiment of a device according to the invention can be used, if the pen carrier when running out through a uniformly circumferential, z. B. on a belt rotating over two rollers or on a rotating disc attached driver periodically and in the meantime for the return, which takes place under the action of a constantly tensioned spring, is released. The entrainment force does not act directly on the stylus carrier, but over a switching element stored in this on this. The movement of the switching element by the entrainment force lets the pen rest on the paper while if this force ceases to exist, the stylus is lifted by a counteracting spring will. The retraction force constantly acting on the stylus support is greater than that for Measure the required drag force when actuating the switching device. This comes about - the stylus to the system, before the outward run of the stylus carrier begins, take place against it Lifting the stylus and beginning the return does not take place one after the other, but at the same time.

This disadvantage is avoided by having both the entrainment force as well as the retraction force on a common switching element designed as a lever can attack, the drag force having the larger lever arm. Thereby actuated she the switching device and lets the stylus come to rest before the movement of the stylus holder begins. If the entrainment force is no longer available, the retraction force the switching device back and lifts the stylus before the return begins.

The invention is based on the drawings of exemplary embodiments explained. In the drawings, Fig.1 shows a diagram of a stylus support according to the invention, in which putting on and taking off the stylus from a directly is controlled by frictional forces actuated mechanical switching element, Fig. 2 and FIG. 3 shows a front and side view, partly in section, of a pen carrier. in which a force transmission member reciprocating against a frictional force engages a mechanical switching element movably attached to the stylus carrier, which causes the stylus to be put on and taken off, Fig. 4 is a diagram of a Stylus carrier, in which the stylus movement by interaction of one only when Existing drag force and a continuously acting retraction force controlled will.

In all representations, the stylus carrier runs from right to left. The writing current is via a guide rod made of metal fed; however, a grinding brush and grinding track can also be arranged for this purpose be.

In Fig. 1, 1 is a writing strip made of electrically sensitive Labeled paper. The stylus carrier 2 slides on a guide rod 3. He is attached to a cord 4, the ends of which are left on two drums, not shown and wound to the right of the writing surface. When the pen carrier runs there the left drum is coupled to an evenly rotating shaft and winds one end of the cord, while the other end of the cord is under spring tension standing right drum unwinds. The left drum is driven during the reverse movement uncoupled, and the right end of the cord is released from the spring loaded The drum is wound up, the cord being taut by braking the left drum is held. The writing wire 5 is drawn into a tube 6, which is on the Arm 7 of a bracket is pivotably mounted. A spring acting on the tube 6 8 lets the writing wire 5 rest resiliently on the paper surface 1. One by one Axis 9 connected roller pair 10 made of insulating material is through on the stylus support attached leaf springs 11, which have bearings for the axle 9 at the free end, constantly pressed against the paper surface 1. When moving there and back, the pair of rollers tries to to turn left or right, but the angle of rotation is through with the front Leaf spring 11 cooperating stop pins 12 limited to about 90 °, after which the Rolls slide on the paper. With clockwise rotation of the rollers, i. H. on return of the pen carrier, the pin 13, which is an extension of one of the stop pins, moves 12 shows up and lifts the tube 6 with the writing wire 5 from the paper away. Conversely, the pin 13 assumes its lowest position when it runs there and gives the movement of the tube 6 downwards free.

According to Fig. 2 and 3, the stylus carrier 14 slides on a guide rod 15. It is similar to that already described for Fig. 1, by a cord 16 moved back and forth, but the cord not directly on the stylus support, rather, it is attached to a part thereof, the tilting frame 18, which is rotatable about the axis 17 is. Stops 19 and 20 limit the range of motion of the tilting frame. With the tilting frame is interchangeably connected to a bracket 21, which partially to a Spiral 22 wound up and .due to this resiliently resting on the writing surface 24 Writing wire 23 carries. During the outward run, the Tilting frame 18 against the stop 19, and the writing wire 23 is resilient to the Paper pressed. When returning, the tilting frame 18 rotates about the axis 17 to to the stop 20, and through the designed as an abutment for the writing wire 21 Part 25 of the bracket 21, the writing wire 23 is lifted upwards from the paper before the stylus holder starts moving. The working method described requires that the stylus carrier 14 is to be dimensioned accordingly friction has opposite the guide rod 15. By means of a spring 26, this can accordingly can be set. The stylus can also be attached to the stylus support in a manner similar to that shown in Fig. 1 14 can be rotatably mounted and controlled by the tilting frame 18 via intermediate links. This has the advantage that, in a better approximation, the stylus tip is vertical to take off the paper.

According to Fig. 4, the pen carrier sliding on the guide rod 27 is 28 when running there through one at an endless, over roles, of which only one, 29; is shown, cam 31 attached to the circumferential belt 30. At the When the cam runs onto the roller 29, the stylus carrier 28 is itself ätib -for the return is released. t 'The entrainment takes place on a rotatable about the axis 32 Winkelelliebel 33, the rotation of which is limited by stop pins 3435 and on which at the same time, finitely smaller lever arm, the tensile force of one under spring tension Standing cord 36 acts through which, when the --Nock is released, the stylus carrier is quickly returned to the starting position. The one that sweeps over the writing surface 37 Writing wire 38 is clamped in a holder 40 rotatable about axis 39, which is articulated to your arm 42 of the angle lever 33 via an arm 41. at At the beginning of the outward run, the entrainment force causes the angle lever33 to tilt to the left, regardless of the magnitude of the force acting on the cord 36. The holder 40 thereby tilts to the right and presses the writing wire 38 resiliently onto the paper. The movement of the stylus carrier does not begin until the arm 42 reaches the lower stop 34 is present. During the return movement, the then only effective pull of the cord 36 causes a Clockwise rotation of the angle lever 33, whereby the holder 40 is rotated to the left and the writing wire is lifted. When the arm 42 rests on the pin 35, the begins Return of the handle carrier.

The arrangements described can also be used with minor changes to be used with stylus moved back and forth on an arc of a circle. The order is not limited to short-term measuring devices. but is in connection with known, Fast-reverse line writing devices of all types can be used.

Claims (5)

PATENT CLAIMS: 1. Writing device for generating recordings on paper sensitive to electric current by means of a pen, preferably with a sharp point and inclined when writing in the direction of its movement towards the writing surface, alternating from a pen that is guided in constant orientation to the writing surface by means of a force conductor - and moving stylus carrier is carried, during the steady movement of which records are generated and which is returned to the starting position after running over the paper with reversal of movement, in particular for short-term measuring devices, characterized in that one during the movement of the stylus carrier (2, 14 or 28 ) by means of the force conductor (4, 16 or 30) to be overcome, on the guide part (3, 15 or 27) of the stylus support or on the writing surface (1) generated frictional force is such that the movably mounted on the stylus support, with a at this arranged Sc stop gear (9 to 13; 18. 21 or 33, 40 to 42) connected stylus (5.23 or 38) is influenced by the action of the driving force acting on this gear with changing sense of direction or the frictional force opposing it, so that it rests on the writing surface when it runs towards it is brought and is lifted off when it returns. 2. Writing device according to claim 1, wherein the force conductor (4) is directly connected to the stylus support, characterized in that the gearbox (9 to 13) by a directly on an element (10) of the gearbox attacking frictional force is actuated. 3. Writing device according to claim 1, characterized in that the force conductor (16) indirectly via a member (18) of the Gearbox (18, 21) is connected to the stylus support (14) and that the gear is actuated by frictional forces acting on the stylus support. -1. Writing device according to claim 1, in which the outward movement of the pen carrier by a uniform circumferential, at the end of the outward run automatically disengaging driver against a constantly effective retraction force is caused, characterized in that the driver (31) acts on a member (33) of the gearbox (33, 40, 41, 42) in such a way that the gearbox against the action of a return spring the stylus on the paper presses. 5. Writing device according to claim 4, characterized in that entrainment force and retraction force in opposite directions with different lever arms (31 and 33) on the gearbox attack in such a way that in the presence of a drag force of the stylus (38) is brought into contact with the paper and when this force ceases to exist the retraction force is lifted from the writing surface. Considered publications: German Patent Nos. 426 779, 579 778, 584 430; Swiss patent specification No. 197 340.