Abstract:
A reading and lifting device has a force amplifying bar which can be reciprocated vertically and is driven positively, and a reading needle is slidably supported therein. A pattern card with nonperforated and perforated points is provided below the force amplifying bar. When the needle hits a nonperforated point, the needle is moved back into the force amplifying bar. In one embodiment, the needle slides with its head on a surface which effects a swivelling of a lock member. Through this, an end of the lock member comes to lie in front of an offset portion of a control arm. The force amplifying bar during its downward movement then carries the control arm along against the force of a spring. The device facilitates the sensitive reading of a pattern card and the forceful passing on of the control information read.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is related to a co-pending application entitled &#34;READING AND CONTROL DEVICE FOR A CONTROL MACHINE&#34;, Ser. No. 235 824, filed Feb. 19, 1981. 
     FIELD OF THE INVENTION 
     This invention relates to a reading and lifting device for a control machine which is controllable by a pattern card having holes or nonperforated points and has a reading needle for reading the pattern card and a force amplifying bar movable in the direction of movement of the reading needle, the reading needle being supported movably in the force amplifying bar to project toward the pattern card and being in operative contact with a lock member which is pivotally supported on the force amplifying bar for movement between two positions. 
     BACKGROUND OF THE INVENTION 
     To control any kind of machines, particularly in the textile industry, it is common to use pattern cards having holes or nonperforated points and made of paper, cardboard, plastic foil or a similar light material. These pattern cards save a lot of room and are handy to use, but they require careful handling. During intensive use, control errors can occur if the control points become damaged or notched due to the action of the reading needles and/or pressure exerted by the reading needles which is too strong. But it is also required of such controls that they be able to apply greater forces which influence a mechanical part. 
     Reading and control devices with a positively driven part, in which part the reading needle is supported, are already known. 
     The goal of the invention is to provide such a device, which works reliably and directly, namely quickly, particularly in machines in which one part is returned by a spring into its initial position after being controlled and driven. 
     SUMMARY OF THE INVENTION 
     This goal is achieved with a device of the foregoing type in which the lock member is constructed as at least a one-arm lever which is pivotally supported on a shaft on the force amplifying bar and is operably engageable on the one hand with the reading needle and on the other hand with a control arm, a spring being provided to move the control arm back to its initial position. 
     With this it is possible, simultaneously with the reading to a control point, to move the part which lowers the reading needle with respect to the reading needle so that it carries out firmly and automatically the appropriate control. This device works when the controlled part reaches again its initial position through the urging of a spring after a relief, namely, between a first and a second control. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     Exemplary embodiments of the subject matter of the invention are illustrated in the drawings, in which: 
     FIGS. 1 to 3 are sectional side views illustrating schematically in three positions of operation a first embodiment of a reading and lifting device having a one-arm lock member; 
     FIGS. 4 to 6 are sectional side views illustrating schematically in three positions of operation a second embodiment of a reading and lifting device having a two-arm lock member; 
     FIGS. 7 to 9 are sectional side views illustrating schematically in three positions of operation a third embodiment of a reading and lifting device having a pivotally supported control arm; and 
     FIGS. 10 to 12 are sectional side views illustrating schematically in three positions of operation a fourth embodiment of a reading and lifting device having a hook on the lock member. 
    
    
     DETAILED DESCRIPTION 
     In all embodiments, a force amplifying bar 1 is a beam which is viewed sectionally in a longitudinal direction and extends over a plurality of control points, wherein at each control point there is provided one of the illustrated control mechanisms having a lock member which is pivotally supported for movement between an initial position and a pivoted position. The beam is moved firmly up and down in the axial direction of the reading needle 2 by a conventional and not-illustrated drive mechanism. The reading needle 2 is used to read the holes or perforated points 3 and nonperforated points 4 of a pattern card 5 and is vertically supported in openings in walls of the force amplifying bar for sliding movement in its axial direction. The reading needle 2 has a head 6 at its upper end. A relatively weak compression spring 7 is arranged between a wall of the bar 1 and a flange 2A of the reading needle 2 and urges the reading needle 2 downwardly, but permits the reading needle 2 to retreat into the force amplifying bar 1 when it hits a nonperforated point on the pattern card 5. A shaft 8 is part of the force amplifying bar 1 and pivotally supports a lock member which will be described later on. 
     In the first exemplary embodiment according to FIGS. 1 to 3, the lock member 10 is a one-arm lever which is pivotally supported on the shaft 8. Between a projection 10A on the lock member 10 and a recess in a wall of the force amplifying bar 1 is arranged a spring 12 which pivotally urges an inclined surface 13 provided on the end of the arm of the lock member 10 against the head 6 of the reading needle 2. Adjacent the inclined surface 13, the arm has a sliding surface 14 for the head 6 which extends approximately radially with respect to the shaft 8 and is substantially aligned with the reading needle 2. The pivot axis S of the lock member 10 approximately intersects the extension of the axis T of the reading needle 2. 
     A control arm 15 is arranged parallel to the force amplifying bar 1, has an offset portion 16 which faces the lock member 10, and is supported slidingly in guides 17. A compression spring 18 arranged between a support 18A and the lower end of the arm 15 urges the control arm 15 upwardly toward the initial position illustrated in FIG. 1. 
     If the force amplifying bar 1 is lowered toward the pattern card 5 and the reading needle 2 enters a hole 3, then nothing changes positionally within the force amplifying mechanism from the position illustrated in FIG. 1. However, if the reading needle 2 hits a nonperforated point 4, then it is moved upwardly into the force amplifying bar 1, as shown in FIGS. 2 and 3. The head 6 slides along the inclined surface 13 of the arm of the lock member 10 and pivots the lock member 10 into the position shown in FIG. 2. Upon a further lowering of the force amplifying bar 1, the tip of the arm of the lock member 10 engages the offset portion 16 and presses the control arm 15 downwardly with a relatively large force without increasing the pressure exerted by the reading needle 2 onto the pattern card 5. Upon a lifting up of the force amplifying bar 1, the springs 18 and 7 respectively move the control arm 15 and the reading needle 2 back into the initial position of each shown in FIG. 1. 
     Various controls can be carried out with the control arm 15, and it is important that the control arm 15 is able to exert a relatively high pressure which is not directly possible through the reading needle alone. Such a control is, for example, used in shed-forming machines for the control of weaving machines, for the control of the color selector or thread distributor in weaving machines, and for controlling lateral movement of heddles or needles in a chain-edge apparatus. The control arm 15 is returned to the initial position (FIG. 1) after each downward movement by the spring 18. 
     The exemplary embodiment according to FIGS. 4 to 6 illustrates a lock member 20 which is a two-arm lever, the lock member 20 under the urging of the spring 22 being pivoted clockwise so that the inclined surface 23 on the right arm of the lock member 20 is urged against the head 6 of the reading needle 2. The left arm of the lock member 20 thereby projects laterally outwardly beyond the force amplifying bar 1 toward a control arm 25. 
     The two arms of the lock member 20 extend downwardly substantially parallel to each other to define a downwardly facing slot 24 in which the head 6 of the reading needle 2 is received. The sloped surface 23 is provided within the slot 24 at the lower end thereof and a substantially radially extending sliding surface 20A is provided in the slot 24 adjacent the inclined surface 23. The control arm 25, guides 27, spring 28 and support 28A are functionally and structurally similar to the control arm 15, guides 17, spring 18 and support 19 of FIGS. 1-3 described hereinabove. 
     If the reading needle 2 of FIGS. 4-6 reads a hole 3 in the pattern card 5 during a lowering of the force amplifying bar 1, the pivotal position of the lock member 20 is not changed. The left arm of the lock member 20 engages the offset portion 26 of the control arm 25 and presses the control arm 25 downwardly to a position similar to that of the control arm 15 in FIG. 3. 
     If, however, the reading needle 2 reads a nonperforated point 4 (FIGS. 5 and 6), then the head 6 slides along the inclined surface 23 and the lock member 20 swivels in a counterclockwise direction, and then the head 6 slides further into the downwardly opening slot 24. The lock member 20 is held in this swivelled position until the bar 1 is raised and the control arm 25 is thus not pressed downwardly but remains in its raised position under the urging of the spring 28. 
     The exemplary embodiment according to FIGS. 7 to 9 has a lock member 30 similar to the lock member 10 in the FIGS. 1 to 3, but the control arm 35 is of differing structure. 
     The one-arm lock member 30 is pivotally supported on the shaft 8 of the force amplifying bar 1. It has an inclined surface 33 and a sliding surface 34 which cooperate with the head 6 of the reading needle 2. In the initial position of FIG. 7 or in the position in which the reading needle 2 reads a hole 3, the lock member 30 remains laterally within the force amplifying bar 1. The control arm 35 has an offset portion 36 and is hingedly connected to a pivotally supported two-arm control element 37. A spring 38 extending between a support 38A and an arm of the element 37 holds the control arm 35 in a lifted position, and a leaf spring 32 mounted in a support 32A presses the control arm 35 toward the lock member 30. 
     If the reading needle 2 reads a perforated point 3 during a lowering of the force amplifying bar 1, the control arm 35 remains uninfluenced until an outwardly projecting nose 39 on the force amplifying bar 1 engages the offset portion 36 and pulls the control arm 35 down parallel to the movement of the force amplifying bar 1. The lateral pressure exerted by the spring 32 facilitates this carrying along. When the force amplifying bar 1 then moves upwardly, the spring 38 acts through the elements 37 to pull the control arm 35 upwardly. 
     If the reading needle 2 reads a nonperforated point 4 during a lowering of the force amplifying bar 1, then its head 6 swings the lock member 30 to the right by sliding along the inclined surface 33 and holds the lock member in this position (FIG. 9) through engagement with the sliding surface 34. The outwardly extending tip of the arm of the lock 30 thereby pushes the control arm 35 outwardly away from the force amplifying bar 1, as shown in FIG. 9, so that the nose 39 slides past the offset portion 36. Thus, a control movement transmission or force transmission onto the two-arm control element 37 does not take place. 
     The force amplifying bar 1 in the exemplary embodiment according to FIGS. 10 to 12 is of simple structure. This permits a faster acceleration of its movement. In contrast to the previous embodiments, the arm of the lock member 40 is longer and has at its end a hook 49. The lock member 40 is pivotally supported on the shaft 8 of the force amplifying bar 1 and is biased by a compression spring 42 arranged between the lock member 40 and a wall of the force amplifying bar 1. In the initial position according to FIG. 10, the lock member 40 engages an edge 41 of the force amplifying bar 1 rather than the head 6 of the reading needle 2, which results in a small relief for the reading needle 2. A control arm 45 extends approximately in the same direction as the reading needle 2. It is supported in guides 47 and has a hook 46 on its lower end, which hook 46 engages or does not engage the arm of the lock member 40, depending on the pivotal position of the lock member 40. 
     The control arm 45 has a flange 45A and a spring 50 arranged between the flange 45A and a stationary support 51 urges the control arm 45 upwardly. 
     The entire structure of the embodiment of FIGS. 10-12 extends in height instead of width and permits a space-saving installation where, for example in the case of dobbies, there is more vertical space available. 
     If the reading needle 2 reads a hole 3, then the force amplifying bar 1 is lowered without a change in the position of its inner mechanism and the control arm 45 is pulled downwardly by the lock member 40 (FIG. 10). 
     If, however, the reading needle 2 reads a nonperforated point 4, then the lock member 40 pivots to the right against the force of the spring 42, due to the sliding of the head 6 of the reading needle 2 over the inclined surface 43 and the sliding surface 44. The hooks 46 and 49 of the control arm 45 and the lock member 40 do not engage, but pass each other side by side, as shown in FIGS. 11 and 12. 
     Although particular preferred embodiments of the invention have been disclosed in detail for illustrative purposes, it will be recognized that variations or modifications of the disclosed apparatus, including the rearrangement of parts, lie within the scope of the present invention.