US3441060A

US3441060A - Double lift dobbies

Info

Publication number: US3441060A
Application number: US673838A
Authority: US
Inventors: Rudolf Schwarz
Original assignee: Staubli Geb & Co
Current assignee: Gebr Staubli & Co; Staubli Geb & Co
Priority date: 1966-10-07
Filing date: 1967-10-09
Publication date: 1969-04-29
Anticipated expiration: 1986-04-29
Also published as: CH472517A; FR1503816A; GB1177400A; DE1710194B1

Description

April 29, 1969 R. SCHWARZ DOUBLE LIFT DOBBIES Sheet of4 Filed Oct. 9, 1967 April 29, 1969 R. SCHWARZ 3,441,060

DOUBLE LIFT DOBBIES Filed Oct. 9, 1967 Sheet 3 of 4 April 29, 1969 R. SCHWARZ DOUBLE LIFT DOBBIES Sheet Filed Oct. 9. 1967 April 29, 1969 R. SCHWARZ.

DOUBLE LIFT DOBBIES Shoot Filiui Qci. 0. 19 7 United States Patent Int. Cl. 1303c N06 US. Cl. 139-68 6 Claims ABSTRACT OF THE DISCLOSURE In a double lift dobby, each shaft actuating lever is provided with a balance the ends of which have hitch hooks which cooperate with holding hooks that are swingably mounted on fixed axes. Each holding hook is coaxial with a likewise swingable lever the movement of which is controlled by the pattern card. By an arrangement of springs and abutments, each holding hook is swingable to a limited extent relative to the respective lever so that it can be preselected and will ride over and engage the respective hitch hook when the latter is subsequently moved into an engaging position in the course of the cycle of oscillation of the balance. The mechanism is adapted to be controlled by cards of various kinds including wooden or metal cards having pins or paper or cardboard cards having holes.

The present invention relates to a double-lift dobby in which each actuating lever of a shaft is provided with a balance whose ends have hitch hooks are movable by two bars abutting thereon swinging to and fro in opposite directionsand displaced through 180, whereby the hitch hooks may be held fixed selectively by holding hooks mounted swingably on stationary axles to raise the shaft at the next balance movement.

More particularly, the invention relates to those dobbies in which the holding hooks are controlled by a pattern card. Steel roller, wood, cardboard or paper cards may be used as pattern cards with appropriate activating mechanisms for the holding hooks.

In dobbies in which each hook for restraining the hitch hook is a component part of the actuating lever, the hitch hook must first reach that location in which it can be gripped by the holding hook before the holding hook starts its engaging tilting movement produced by the pattern card. The time required for this engagement plays an important part in the running of the dobby and thus determines the operating speed of the loom.

On the other hand, since the tilting of the holding hook has to take place at a certain point of the operational time sequence, the advance of the pattern card has to occur discontinuously which, at high speeds, leads to severe stresses on the pins and the connections between the units of the wooden cards.

The object of the invention is to obviate these disadvantages, thus increasing the operational speed of the dobby and at the same time reducing the stress on the pattern card and the pins.

The double-lift dobby, according to the invention, in which each actuating lever of a shaft is provided with a balance, the ends of which have hitch hooks which cooperate with holding hooks are swingably mounted on a stationary axle and are controlled by a pattern card for raising or lowering the shaft, is characterized in that each holding hook is swingable and is operatively associated with a likewise swingable lever which is mounted on a stationary axle and whose movement is controlled by the pattern card, the holding hook being held at a given angular position relative to the lever by an arrangement of springs and stops, and the holding hook being swinglice able to a limited extent relative to the lever, in order that the holding hook arrives in the operational position for engagement with the hitch hook, before the hitch hook of the balance is itself in the engagement position, and that the holding hook is swung, being pushed by the hitch hook, until the holding engages with the hitch hook under the action of the tension spring, the corresponding shaft being raised by the movement of the rod of the second hitch hook.

Due to this arrangement, the time required for engaging the hitch hooks and holding hooks can be greatly reduced without the balance having to be stopped. By this new way of preselection the operational speed of the dobby can be increased. Moreover, the pattern card can be advanced continuously, since tilting of the holding hook can take place before the hitch hook reaches its engagement position.

The angular disposition of the hook and lever can be determined by the feature that a stop provided on the hitch hook abuts the lever under the action of a tension spring.

constructional examples of the dobby according to the invention are illustrated in the drawing.

FIGURE 1 is a longtudinal section of a shaft actuating device with direct wooden card control;

FIGURES 2, 3 and 4 show different positions of the holding hook in the same embodiment as in FIGURE 1;

FIGURE 5 is a longitudinal section of a variant of a shaft actuating device with direct wooden card control; and

FIGURE 6 is a longitudinal section of another shaft actuating device with paper card control with intenposed needle system.

In all figures the same parts have the same reference numerals, parts occurring twice in each shaft control or only similar parts having an additional subscript. Each drawing illustrates the shaft actuating device for a single shaft as is used for dobbies for looms. Such a device controls the shaft (not shown) of a loom by means of the swinging lever 2 which is supported on the stationary axle 3. The shaft is connected to the free end of the lever 2 by the chain or cord 1.

Swinging lever 2 and jack-lever 5 are interconnected by the link 4. For this purpose the jack-lever 5 is provided with a recess F in which is accommodated the end of the link 4. A return tension spring 8 is likewise fixed to another recess below the recess F. One end of the jack-lever 5 is mounted on the stationary axle 6 and the other end is pivotally connected centrally at 11 on the balance 9 on the ends of which are pivotally mounted the hitch hooks 10a and 10b, the hook opening facing upwards in the upper hook 10a and the hook opening in the lower hook 10b facing downwards.

All of the balances 9 of the dobby are moved by two continuous bars 12a and 12b, the bar 12a lying on the abutment surface 13a of the hitch hook 10a and the bar 12b on the abutment surface 13b of the hitch hook 101;. These bars 12a and 12b carry out a swinging, oppositely directed to and fro movement, each on an arc whose center lies approximately at the pivot point 11. The paths of the bearing positions of the hitch hooks thus produced are indicated as arcs 14a and 14b in FIGURE 1. This movement permits engagement of the hitch hook 10a or 10b with one of the holding hooks 18a and 18b respectively, which are swingably mounted respectively on the stationary axles 15a and 15b and are controlled by the pattern card 16 provided with pins 27.

Bell crank levers 21a and 21b, which have two

arms

17a and 22a or 17b and 2212 respectively, cooperate with the holding hook. As shown in FIGURE 1, the opening of the upper hook 18a faces downwards and the opening of the lower hook 18b upwards.

The holding hook 18a is pivotally mounted on the stationary axle' a while the bell crank lever 21a is itself swingably disposed on the boss a of the hook 18a. The same applies to the hook 18b which is mounted on the axle 15b and bears the bell crank lever 2112 on its boss 20b. The two arms of each bell crank lever are approximately at right angles to each other. The arms 17:: and 1717 respectively, are provided with bearing surfaces 19a, 1%, respectively for engagement by the pattern card pins 27.

The angular disposition of the hook 18a or 18b relative to its bell crank lever 21a or 21b is determined by the lug 23a or 2311 of the holding hook 18a or 18]), said lug acting as a limiting means by abutting the arm 22a or 22b under the action of the tension spring 24a or 24b. The tension spring 24a or 24b is fixed at one end to the hook 18a or 18b and at the other end to the end of the rod 25a or 251) rigidly connected to the arm 22a or 22b.

Other springs 26a or 26b which act on the arms 17a and 17b from a fixed machine part, urge the arms 22a and 22b against the stop 28 so that when a pin 27 is missing from the pattern card 16, the holding hooks 18a and 1812 are disengaged from the hitch hooks 10a and 10b and the balance 9 can thus swing in known fashion without imparting a movement to the corresponding shaft.

In contrast, if one of the pins 27 of the pattern card 16 arrives, for example, on the bearing surface 19a of the arm 17a, then the arm 17a swings in the direction of arrow 29 in FIGURE 2, the arm 22a thus clearing the way for the lug 23a, so that, under the action of the spring 24a, the hook moves in the direction of the arrow 29 and thus lies in the path of the hitch hook 10a of the balance 9. The bar 12a contacting the abutment surface 13a of the hitch hook 10a brings the end surface B of the hook 10a into contact with the end surface D of the hook 18a, the latter hookas shown in FIGURE 3moving back in the direction of the arrow 30 against the action of the spring 24a. The hitch hook 10a starts its forward movement under the pressure of the bar 12a, both surfaces B and D remaining in contact until the moment when the surface B slides under the surface D, the hook 18a, pulled by the spring 24a, being thus able to assume its previous position. In this swinging of the holding hook 18a-as shown in FIGURE 3the lug 23a is released from the arm 22a. The two

hooks

18a and 10a then engage when the return movement of the bar 12a begins.

Since the hitch hook 10a is engaged and held back by the hook 18a, it cannot move back any further, so that when the opposite end of the balance 9 is pushed by the rod 121), the pivot point 11 of this balance moves on an arc about the axle 6 and entrains the jack lever 5 and the actuating lever 2 through the link 4 which causes raising of the corresponding shaft.

By virtue of the described arrangement, the holding hooks 18a and 18b can be moved into their operational positions for engagement before the hitch hooks 10a and 1011 have completed their full swinging movement towards the holding hooks. As a result of this preselection, the time required for engagement is reduced and the operational speed of the dobby and the loom can be increased.

When the pin 27 no longer affects the bearing surface 19a, the holding hook 18a stays in engagement with the hitch hook 10a until the moment when the swinging bar 12a contacts the abutment surface 13a of the coupled hook 10a and pushes the hitch hook out of the engaged position, i.e., provides the necessary play to allow the holding hook 18a to snap outwards under the action of the spring 26:: and against the tension of the spring 24a and reassume its original position. The balance 9 is thus released and returns with the bar 12a to its starting position, the bar 12a carryin gout the same movement and the jack lever 5 and also the actuating lever 2 following this movement under the action of the return springs of the corresponding shaft.

In the embodiment of FIGURE 5 the

bearing surfaces

19c and 19d are not arranged on both sides of the pattern card as in FIGURES 1 to 4 but are arranged at the front thereof. This has the advantage that both bearing surfaces are controlled by the pattern card at one and the same location. Thus the patterns do not have to be placed on the pattern card with a spacing of several picks. In addition it can be seen from the drawing that by altering the opposed position of the bearing surfaces, an alteration of the hook positions was also necessitated, i.e., the

holding hooks

18c and 18d are open toward the outer side of the machine and the

hitch hooks

10c and 10d toward the inner side.

As in the example first illustrated and described, the actuating lever 2, swingable about the axle 3, is connected at one side to the shaft by the chain 1 and at the other side by the link 4 to the jack-lever 5. The latter is mounted on the axle 6 and centrally engages the balance 9. At both ends of the balance are disposed the

hitch hooks

10c and 10d which abut the bars and 12d provided they are not held back by the

holding hooks

18c and 18d in the extended position. A pin 27 of the pattern card 16 causes a swinging of the bell crank lever 210 or 21d about the stationary axle or 15d when it passes over the

surface

190 or 19d. A

tension spring

26c or 26d ensures that the

surface

19c or 19d remains in contact with the pin as long as there is one in front of it. If there is no pin at the height of the

surfaces

190 or 19d on the pattern card, the

spring

26c or 26d swings the bell crank lever 210 or 21d until its

arm

22c or 22d abuts a stop 28. Since no force is exerted on the holding

hook

18c or 18d except by the

tension spring

240 or 24d, which is attached to the bell crank

lever

21c or 21d as well as to the holding hook or 18d, it lies in the position illustrated, i.e., it abuts the bell crank lever with its

projection

230 or 23d.

The method of operation of the cooperating

hooks

18c and 100 or 18d and 10a is the same as that illustrated in FIGURES 1 to 4.

The upper holding hook 180 in FIGURE 5 is ready for engagement with the upper hitch hook 10c as in FIG- URE 2 so that when the hitch hook 10c is next pushed out, the end surfaces B and D meet and the hook 180 moves inwards until engagement.

If, instead of the wooden or metal cards, e.g. roller cards, provided with pins or pegs, perforated paper or cardboard cards are used which cannot exert any direct force on a lever, then the device must be somewhat modified constructionally, as is illustrated for example in FIGURE 6. The actual shaft actuating device again consists of chain or rope I, actuating lever 2 which is mounted on the axle 3, link 4, jack lever 5 which is seated on the axle 6, return spring 8, balance 9, bars 12c and 12), and also hitch hooks 10c and 10) with outwardly directed hook openings. On the axle 15s or 15 is mounted the hitch hook 18s or 18f and on each boss 20c or 20; of this hook, the bell crank lever 21e or 211.

The drawing also shows the stop 28 for the bell crank levers 21c and 21 the rods 25c and 25f of the bell crank lever to which are attached the tension springs 24c and 24 between holding

hooks

18e or 18; and bell crank levers 212 or 21f, the lugs 23e and 23 of the holding hooks, as also the tension springs 262 and 26 of each bell crank lever.

Serving to initiate the control is the pattern card 16' from which the reading needles 31c or 31f scan the pat tern, and, depending on whether the reading needle has dropped into an aperture or rests on the card, the tension needles 326 or 32f are entrained in a known manner by the movement of the tension rails 33s or 33] swinging to and fro as indicated by arrow A, thus causing swinging of the bell crank lever 21e or 21]. Operation of the mechanism to effect movement of the shaft corresponds to the embodiment illustrated in FIGURES 1-4 and the corresponding description.

It will be understood that features of the several embodiments are mutually interchangeable and that other modifications of the invention may be made within the scope of the appended claims.

What I claim and desire to be secured by Letters Patent is:

1. In a double lift dobby, the combination of a balance, a shaft actuating lever pivotally connected to a midsection of said balance, hitch hooks mounted on opposite ends of said balance, means for cyclically oscillating said balance, holding hooks swingable about fixed axes and engageable with said hitch hooks, selector levers swingable about said fixed axes and associated with said holding hooks, pattern card means cooperating with said selector levers to move same from a non-selected position to a selected position; resilient means interconnecting each said selector lever and associated holding hook to urge said holding hook into a normal position relative to said selector lever and means for limiting the movement of said holding hook relative to said selector lever and thereby determining their relative positions.

2. Double lift dobby according to claim 1, in which said limiting means comprises an abutment on said holding hook engageable with said selector lever and in which said resilient means comprises a spring which urges said abutment resiliently in engagement in such manner as to allow said holding hook to be movable relative to said selector lever against the resilient action of said spring.

3. Double lift dobby according to claim 2, in which a second spring acts on said selector lever to urge it against a fixed stop in non-selected position.

4. Double lift dobby according to claim 3, in which said pattern card means has pegs for exerting a lifting force, and in which said selector lever has a bearing surface engageable by said pegs to swing said lever against the force of said second spring to selected position.

5. Double lift dobby according to claim 3, in which said pattern card means comprises a perforated card, and in which card reading means comprises an oscillating tension bar, a tension needle connected with said selector lever, and a reading needle for sensing perforations in said card and moving said tension needle in position for engagement by said tension bar to move said selector lever to selected position.

6. Double lift dobby according to claim 3, in which said selector lever is a bell crank lever having a first arm on which said pattern card means acts and a second arm engageable by said abutment of said holding hook under action of said first mentioned spring.

References Cited UNITED STATES PATENTS 3,276,483 10/1966 Golobart 13968 XR 3,307,591 3/1967 Staubli 13971 3,381,719 5/1968 Favre 139-68 HENRY S. JAUDON, Primary Examiner.

U.S. Cl. X.R.