US859085A - Dobby mechanism for looms. - Google Patents

Description

PATENTED JULY 2, 19,07.

R. KOHLHAAS.

DOBBY MEGHANISM POR LOOMS.

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APPLIUATIGN FILED AUG. 2, 1906.

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BOBBY MBGHANISM POR4 LOOMS,

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APPLICATION FILED AUG. 2, 1906.

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No. 859,085. PATENTED JULY 2. 1907.

RKOHLILAAS.v BOBBY MBGHANISM FOR Looms..

APPLICATION FILED AUG. 2, 1906.

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UNITED STATES PATENT OFFICE.

DOBBY MECHANISM FOR LOOMS. V

Specification of Letters Patent.

Patented July 2, 1907.

Application filed August 2,1906. Serial No. 328,832.

To all whom it 'may concern:

Be it known that I, 'RnYNoLn KoHLHAAs, a citizen of the United States, residing at Paterson, Passaic county, State of New Jersey, have invented new and useful Improvements in Dobby Mechanism for Looms, of which the following is a specification.

This invention relates to an improved open shed dobby mechanism for looms, which is of greatly simplified construction, reliable in its operation, and of great durability.

In the accompanying drawings: Figure l is an end elevation of my improved dobby; Fig. 2 a front view thereof; Fig. 3 a rear view, partly broken away and with some of the parts omitted; Fig. 4 a vertical section on line 4 4, Fig. l g Fig. 5 a detail section through the cardcylinder and adjoining parts; Fig. 6 a cross section on line 6 6, Fig. 5; Fig. 7 a detail of the leveling device; Figs. 8, 9 and 10 are details of parts of the coupled levers; Fig. 11 a section on line 1l-11, Fig. 8, Fig. 12 a detail of the connection between lever and hook; Fig. 13 a section on line 13-13, Fig. 12, and Fig. 14 a detail of the lifter.

In the frame 2() of the dobby is journaled a rock-shaft 2l. Fast on each end of this shaft is a two-arm lever 22, one of said levers having an extension 23 which is connected to one member 24 of a jointed rod, the other member 25 of which is eccentrically pivoted to the driving wheel 26. Bythe means described, an oscillating movement is imparted to levers 22. To the upper ends of these levers are pivoted links 27 ,Ewhich are in turn pivoted at 28 to reciprocating rods 29, connected by an upper bar 30. In like manner the lower ends of levers 22 are connected by links 3l to rods 32, to which is attached a lower bar 33` Thus the oscillation of shaft 21 will alternately advance and retract bars 30, 33.

Means are provided by which either of the bars may be operatively connected with the cords 34 that serve to raise the sheds of the loom in the usual manner. These means are as follows: Upon a shaft 35 turn a series of curved levers 36 provided with integral rack-extensions 37 engaged by the cords 34. Lever 36 has a hook 38 of reduced thickness, and shoulders 39 below such hook. Back to back with hook 38 is a second hook 40, formed at about the center of a two-arm lever 4l. Hooks 38, 40, are coupled-to each other by a yoke or slotted link 42 supported upon shoulders 39, and having a nose 43 bearing against the edge of hook 38. Link 42 serves to couple lever 41 to lever 36, without the use of pins and in such a manner that the parts may be readily assembled and separated. To upper end of lever 41 is ulcrumed the shank 44 of an upper hook 45. This shank is humpcd or has a raised section 46 at a distance back oi hook 45. In like manner there is pivoted to the lower end of lever 4l, the shank 47 of a hook 48, said shank having the hump or raised section 49. The beaks oi both hooks 45, 48 are directed downwards.

Abutments 50, 51 on frame 20, limit the oscillation of lever 4l. The `pivotal connection between lever 4l and shanks 44 and 47, is preferably such that the parts may be readily assembled and separated. As shown, each end of lever 4l terminates in a disk or head 52 having a sector-shaped slot 53, which opens into a cen@ tral eye 54 the inner end of slot 53 being narrower than the diameter of said eye. The end of each of the Vshanks 44, 47, is made tapering to correspond to the shape oi slot 53, and is provided with a knuckle 55 and a slot 56 in proximity to such knuckle. The latter engages eye 54, while disk 52 enters slot 56, as shown.

By the construction described, the parts may be assembled by laterally introducing contracted end of shank 44 and knuckle 55 into slot 53 and eye 54, respectively, and then turning said shank until disk 52 is received within slot 56. In this way any disengagement of the parts while'in their operative position is prevented.

The relative position of the parts is such that by lowering the hooks 45, they may be brought into engagement with bar 30, while the hooks 48 may in like manner be brought into engagement with bar 33. If either of the upper' hooks is thus made to engage bar 30, the outward movement of the latter will, by said hook, be transmitted to the upper end of lever 4l, so that the latter will swing on its lower head 52, bearing against abutment 5l. In this way the lever 36 is drawn downwards on fulcrum 35, to raise, by means of cord 34, the corresponding shed, which is weighted as usual. In like manner when either of the lower hooks 48 is swung down, said hook will engage bar 33 to swing lever 41 on its upper head 52 and thereby lower lever 36 to again raise the shed. If either one of the hooks 45 and 48 or" one and the same lever 41 is in engagement with its bar, to raise the shed, and during the next pick, the other hook of such lever is also brought into en` gagement with its bar, then the lever 4l will befreely swung on yoke 42, while no motion will be transmitted to lever 36. Thus the shed will remain raised or held up for any given number of picks, without working up and down at each pick.

The hooks 45, 48 connected to thesame lever 41, are both operated by means of a single lifter, in lieu of being operated by two separate lifter-s, as heretofore. This .results in a great simplieation of the machine, more particularly, because but a single card and card- .cylinder performs the work ol" operating the upper, as well as the lower hooks, while heretofore a separate card and card-cylinder was necessary for each set of hooks.

The litters 57 have bent upperkends 58 by which they are normally suspended Vfrom a slotted top bar 59 of frame 20. The downwardly bent upper end 58 of each lifter engages a perforation adjoining that through which the lifter passes, so as to hold the latter rorn rotation during the vertical movement of the lifter. Each lifter has an upper step or shoulder 60 adapted to engage shank 44, and a lower step or shoulder 61 adapted to engage shank 47. ranged respectively vertically below the shanks o f hooks 45, 48, so as to bodily engage said shanks when the lifters are raised. The lifters are guided near their lower ends by a perforated bar 62, and are adapted to be supported by the card 63 that partly surrounds the cardcylinder 64. The latter may be raised and lowered and also rotated in the usual manner, and is journaled in swinging arms 65, which receive oscillating motion by rod 66 from crank wheel 67 the latter making double the number of revolutions as wheel 26. Cylinder 64 is secured to arms 65 by hooks 68, and is held in position by a spring-plunger 69, while it is rotated by spring-influenced hook 70 in the usual manner.

It will be seen that bars 30 and 33 receive a reciprocating movement from crank disk 26, in such a manner that while bar 30 moves inwards, to the lef tin Fig. 4), bar 33 will move outwards. When bar 3() is in its extreme outward position, bar 33 will therefore be in its extreme inward position, and Vice versa. During the reciprocating movement of bars 30, 33, cylinder 64, together with card 63, receives oscillating movement from crank disk 67, but as the latter makes twice as many rotations as disk 26, cylinder 64 will make two oscillations while bars 30, 33 make each one complete stroke. The movements are so timed that when the bars 30, and 33 arrive at their terminal positions, cylinder 64 will be raised. As the latter is provided with recesses 7l adapted to be brought below the perforations of card 63, it is clear that whenever these recesses are covered by an imperforate portion of the card, the lifters 57 will be raised by the rising cylinder,

` while, when the recesses are uncovered by being alined with perforations of the card, the lifters will remain in their lowered position. When the shed is lowered, lever 41 hangs upright to engage both abutments 59 and 5l, so that both hooks 45 and 48 are retracted and vertically above one another. 1n this position the hooks rest on supports 72, 73, of a slotted frame 74, which supports are placed at such a height that the hooks are in the path of bars 30, 33, respectively.

'lf it is desired to hold the shed in its lowered position, hooks 45, 48 must be raised at the end of each stroke of bars 30 and 33, so as to'clear such bars when they start their outward movement. This is effected by cylinder 64, its recess 71, directly below lifter 59, be#

, ing covered by an imperforate portion of the card.

The upward movement of the card and cylinder will therefore cause the lifter 57 to be raised, so as to swing hooks 45 and 48 upwards and 'cause them to clear bars 30, 33 respectively.

Wherever it is desired to raise the shed, card 63 is provided with a perforation below lifter 57, so that the latter is not taken along by the upward movement of cylinder 64. 1n this way the hooks 45 and 48 remain lowered and either one or the other of them will be taken along by its outwardly moving bar 30 or 33. Whether hook 45 or hook 48 is thus taken along, depends upon the position of bars 30 and 33. If bar 30 is in its retracted position, hook 45 will become engaged by said bar and be taken along when the latter moves Shoulders 60 and 61, are aroutwardly, while hook 48 remains idle. In similar manner hook 48 will be taken along by bar 33 if the latter happens to be in its retracted position, while hook 45 remains idle. Fig. 4 shows the position of the parts when a hook 48 has been carried to its extreme outward position by bar 33. During the outward movement of this hook, lever 41 has swung lever 36, as above described, and the shed has been opened by cord 34. If it is desired to immediately lower the shed, the meanwhile rotated and raised cylinder 64 has again presented an imperforate portion of the cardto lifter 57, so that the latter is raised and upper hook 45 is brought out of engagement with bar 30 by upper shoulder 60. This upward movement of lifter 57, while hook 48 still engages bar 33, is rendered possible by providing shank 47 with the hump 49. As this hump is brought vertically above lower shoulder 61 of lifter 57, when the hook 48 is in its outward position, the lifter 57 may be raised to swing hook 45 upward without causing hook 48 to be interfered with. 1f it is, however, desired to hold the shed raised for a number of picks, the rotated and raised cylinder 64 must present a perforation to lifter 57, so that the latter may enter a corresponding recess 71 in the cylinder. In this way hook 45 remains in its lowered position and will be taken along by the advancing bar 30, while hook 48 will, under the influence of the weighted shed, follow the receding bar 33. Lever 36 is prevented from being raised and thereby lowering the shed, as longas both hooks 45 and 48 of the same lever 4l, are in engagement with their bars. The operation of the parts is the same, in substance, if bar 30 takes along hook 45, when shoulder 61 may raise hook 48, while hook 45 is not interfered with by shoulder 60, owing to raised shank-section 46.

Means are provided for permitting a ready leveling of the warp threads, `without imparting an objectionable shock to the dobby and loom. These means are as follows: In bearing 75 of frame 20 turns a rock-shaft 76, one end of which carries an arm 77 having ,over-balancing weight 78. The movement of the rock-shaft is controlled by ahand-spring 79 which is fastened to lever 77, and is under control of the operator. Rock-shaft 76 is provided near each end with a lever 80, to which is pivoted at 81 an arm 82, the two arms 82 being connected at their upwardly inclined free ends by a levelingblade 83. Each arm has a curved lower side, as shown, and is arranged above an abutment 84. If the warp threads are to be leveled, a pull on string 79 will rock shaft 76 to advance arms 82 by levers 80. During the first part of the forward stroke of the arms, they will freely advance below Shanks 47 without coming into engagement therewith. During the latter part of the forward stroke, however, the arms willI be raised by toes 85 formed on bars 33, so that blade 83 passes between bar 33 and shank 47, and thereby raises hook 48 out of engagement with the bar. All the advanced hooks 48 being thus made to clear bar 33, the operator gradually slackens the string 79, so that the hooks will be slowly retracted by the weighted shed. The latter will consequently be gently lowered, its descent being under the complete control of the operator, so that all shocks are avoided.

What l claim is:

f1. In a dobby mechanism for looms, a pair of reciproeating bars, a pair of hooks adapted to engage said bars,

shed-raising means operatively connected to the hooks, a top bar having adjoining perforatons, a lifter passing through one of said perforations and having a bent upper end that engages the other perforation, anda pair of shoulders on the lifter arranged vertically below the hooks, substantially as specified.

2. In a dobby mechanism for looms, a shed-raising lever having a first hook and a pair of shoulders beneath said hook, combined with a second lever having a hook placed back to back relatively to the rst hook, means for oscillating the second lever, and a link embracing both hooks and supported on the shoulders of the first hook, substantially as specified.

3. In a dobby mechanism for looms, a shed-raising lever having a first hook and a pair of shoulders beneath said hook, combined with a second lever having a hook placed back to back relatively to the first hook, means for oscillating the second lever, a link embracing both hooks and supported on the shoulders of the first hook, and a nose l on the link that engages the back of said first hook, substantially Vas specified.

4. In a dobby mechanism for looms, a series of hooks, combined with a rock-shaft, a hand-controlled over-balanced lever secured thereto, arms operatively connected t0 said shaft, a blade connecting the arms, and means for gradually raising the blade into operative engagement with the hooks, substantially as specified.

5. In a dobby mechanism for looms, a rock-shaft@ handcontrolled over-balanced lever secured thereto, arms operatively eonnected to said shaft and having upwardly inclined ends, a blade connecting said ends, and a bar having toes adapted to engage the arms, substantially as specified.

Signed by me at Paterson, New Jersey, this 30th day of July, 1906.

REYNOLD KOHLHAAS.

Witnesses FRANKLIN HOLLAND, Louisa HOLLAND.

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