US2735890A

US2735890A - Wosteney

Info

Publication number: US2735890A
Authority: US
Priority date: 1951-12-21
Publication date: 1956-02-21
Anticipated expiration: 1973-02-21
Also published as: US2966547A; FR1073450A; FR71847E; GB717657A; GB819708A; DE1029034B; CH310989A; CH354116A

Description

Filed' Dec. 1, 1952 United States Patent O ce 2,735,890 y START-STOP TELEPREJ'IER RECEIVER Herbert Wsteney, Municll-Thalkirchen, Germany, assignor to Siemens & Halske, Aktiengesellschaft, Munich, Germany, a corporation of Germany Application December 1, 1952, Serial No. 323,487

Claims priority, application Germany December 21, 1951 9 Claims. (Cl. 178-33) This invention relates to receiver mechanisms for remotely controlled signalling apparatus, and is particularly concerned with a teleprinter receiver operating in accordance with the start-stop principle.

The operative release of remotely controlled apparatus, operating in accordance with the start-stop principle, especially of teleprinters, remotely controlled measuring devices and the like, is usually effected by the deenergization of the receiver magnet. The release of the armature of such magnet controls, among other operations, the start of rotation of the motor-driven startstop or selector shaft.

The pressure of the clutch means, the friction between the various elements due, for example, to un avoidable contamination, small adjustment errors and the like as well as wear of the various parts constitute unavoidable variable factors which are ascertained with difiiculty and adversely affect the reliability of operation because deviations in the individual operations by tenth of milliseconds may in start-stop systems play an important part.

lt is believed that these factors cause variable loading of the armature of the receiver magnet, thereby detrimentally atl'ecting the operation of the apparatus.

The invention proposes to eliminate the drawbacks inherent in the above indicated situation by relieving the armature in its normal position and also incident to the major portion of -its release motion of extraneous loads so that it can act with a great momentum upon the operating elements controlled by it. The armature of the receiver magnet is, in accordance with the invention, completely free of any load. The receiver cam is locked by a lever system. The pressure exerted by the clutch is, in accordance with the invention, absorbed by a special locking lever, and not by the armature.

The invention will now be described with reference to the accompanying drawing, showing as an example in schematic representation an embodiment in which all parts are illustrated in normal or resting position.

The receiver magnet 1, which is energized by the incoming signals, holds in normally attracted position the armature 2, which is pivotally mounted at 3. The attractive force of the magnet 1 is opposed by a spring 15 which exerts a force in the direction P1, thus tending to move the armature into its released position. The receiver cam 16 on the shaft 6 is acted upon by a driving force (for example, a slip clutch, not shown) which is effective in the direction of the arrow. The rotation of the receiver cam 16 having the lobe 7 is in resting position prevented by interlocking engagement of the lobe 7 with an extension projecting from the locking lever 17, pivoted at 4, which is in turn in locking engagement with the trigger lever 5. Between the finger 11 of the trigger lever and the extension 12 of the armature 2 is a free space, as shown. The distance represented by this space corresponds to the major portion of the release travel of the armature 2 responsive to deenergization of the magnet 1.

2,735,890 Patented Feb. 21, 1956 When the receiver magnet 1 is deenergized, the armature 2 will move by the action of the spring 15 pulling in the direction P1 entirely unimpeded by any variable factor for a distance corresponding to the space between the parts 11 and 12. The larger part of the interval allotted to the release travel of the armature therefore is constant. The extension 12 of the armature 2 hits the finger l1 of the trigger lever 5 with great momentum stored in its unimpeded motion, and the lever 5 moves away from the stop 10 against the force of a spring 18 acting in the direction P2 and frees the locking lever 17. The action is positive and forceful. The receiver cam 16 can now rotate in the direction of the arrow.

The locking lever 17 is restored to its initial position by the force of a spring 19 acting in the direction P4 as soon as the lobe 7 of the receiver cam 16 has Sulliciently rotated to the right.

The lobe 8 on the receiver cam means hits the angular end 20 of the lower arm 9 of the restoring lever near the termination of its revolution, causing counterclockwise displacement of the lever arm 9 against the force of a spring 21 which acts in the direction P3. To the lower arm 9 of the restoring lever is connected an other arm 9', by a connecting link 23. Accordingly, the angular end 22 of the arm 9 of the restoring lever hits the extension 12 of the armature 2, thus causing the armature to move positively into its normal position against the force of the spring 15 until it is in engage ment with the pole shoes of the magnet 1. The trigger lever 5 is thereby freed and placed in engagement with the stop 10 by the action of the spring 18 pulling in the direction P2. The locking lever 17 pivoted at 4 interlocks again with the trigger lever 5, thereby arresting the motion of the receiver cam means on the shaft 6 by interlocking engagement of its lobe 7. The receiver cam means remains now at rest so long as the armature 2 of the magnet 1 is in attracted position.

The described interplay and interaction of the parts is again initiated responsive to the deenergization of the magnet 1.

Changes may be made within the scope and spirit of the appended claims.

I claim:

l. A start-stop signalling apparatus comprising cam means and means attempting to rotate it, a trigger lever and means for pivotally mounting it at a point between the opposite ends thereof, means acting upon one end of said trigger lever to hold the other end thereof in a predetermined position, interlock means between said trigger lever and said cam means to hold said cam means against rotation by the means attempting to rotate it, a receiver magnet having a normally attracted pivoted armature, force means acting upon said armature attempting to move it into its released position, and an operating arm extending from said armature for coaction with said other end of said trigger lever, said operating arm being in attracted position of said armature spaced from such other end of said trigger lever by a predetermined distance corresponding to the major portion of angular travel of said operating arm incident to the release of said armature responsive to deenergization of said receiver magnet, whereby said armature moves into released position by the action of said force means wholly unimpeded by any external force to move said operating arm wholly unimpeded by an angular amount corresponding to said predetermined distance so as to strike said other end of said trigger lever with the momentum stored in its unimpeded travel for the purpose of displacing said trigger lever positively to free said interlock means so as to effect rotation of said cam means.

2. The structure dened in claim 1, comprising a locking lever which constitutes said interlock means.

3. The structure defined in claim 2, comprising means effective at the end of one revolution of said cam means for restoring said trigger lever and said locking lever to cause said locking lever to stop the rotation of said cam means. f l

4. The structure defined in claim 1, comprising restoring means actuated by said cam means at the end of one revolution thereof for restoring said armature to initial position.

5. The structure defined in claim 4, wherein a pivotally mounted lever constitutes said restoring means, said cam means actuating said last named lever at the end of one revolution thereof to cause it to restore said armature, and spring means for thereafter restoring such lever to its normal position.

6. In a start-stop teleprinter receiver having rotatable receiver cam means and means attempting to rotate it and having a receiver magnet which is normally energized to hold a coacting armature normally in attracted position, a device for controlling the operation of said cam means, said device being interposed between said armature and said cam means and comprising a locking lever for normally locking said cam means against rotation, a trigger lever for interlocking engagement with said locking lever, an operating arm projecting from said trigger lever, the free end of said arm being spaced from said armature by a distance corresponding to the major portion of the angular release travel thereof responsive to deenergization of said magnet, whereby said armature moves upon release thereof through such major portion Wholly unimpeded by any external force to strike said trigger lever with momentum stored by such unimpeded motion for the purpose of positively actuating said trigger lever to release said locking lever so as to release said cam means for rotation.

7. The structure defined in claim 6, comprising spring means for biasing said armature in the direction of its release motion, and spring means for biasing said trigger lever in the direction of its normal position relative to said armature.

8. The structure defined in claim 6, comprising a restoring lever, and means controlled by said cam means upon conclusion of a revolution thereof for actuating said restoring lever to operate said armature so as to restore it to its initial position.

9. The structure defined in claim 8, comprising spring means for biasing said armature in the direction of the release motion thereof, spring means for biasing said trigger lever in the direction of its normal position relative to said armature, and spring means for biasing said restoring lever in the direction of its normal position relative to said armature.

References Cited in the tile of this patent UNITED STATES PATENTS