US2305386A

US2305386A - Paper indicated dobby

Info

Publication number: US2305386A
Application number: US427318A
Authority: US
Inventors: Clarence R Kronoff
Original assignee: Crompton and Knowles Corp
Current assignee: Crompton and Knowles Corp
Priority date: 1942-01-19
Filing date: 1942-01-19
Publication date: 1942-12-15
Anticipated expiration: 1959-12-15

Description

D 15, 1942. c. R. KRoNoFF TAPER INDICATED BOBBY Filed Jan. 19, 1942 3 Sheefcs-Sheet 1 Dc.15,1942. C, R KRoNoFF I I 2,305,386

PALER INDICATED DOBBY Filed Jan. 19, 1942 3 Sheets-Sheet 2 IIIIIIIH O l0 Il INVENTR,

CLnaaNcE. RKRoNov-r HTTORNEY Dec. l5, 1942-. c. R. KRoNr-'F 2305,385

PAPER INDIcATED DQBBY l I Filed Jan. 19, 1942 s sheets-sheet s Fria-hg INVENTOR Patented Dec. 15, 1942 PAPER INDICATED DOBBY Clarence R. Kronoif, Worcester, Mass., assignor to Crompton & Knowles Loom Works, Worcester, Mass., a corporation of Massachusetts Application January 19, 1942, Serial No. 427,318

21 Claims.

This invention relates to loom dobbies which are indicated by paper patterns and it is the general object of the invention to provide improved pattern reading and feeding mechanism so constructed as to facilitate exchange of patterns.

In co-pending application Serial No. 402,080 there is set forth a paper pattern indicated loom dobby in which yielding plungers move toward hook lifters and are controlled by a paper pattern between the plungers and the wires. The plungers are mounted on a carriage which rises and falls in timed relation with the movement of the dobby knives and mechanism is provided to advance the pattern while the carriage is in low position so that the several zones of indications may move successively to pattern reading position over the plungers. It is an important object of my present invention to provide improved driving mechanism for the carriage including a mounting normally in supporting position with respect to the carriage but swingable to a position cut of the path of the paper pattern when the latter is to be taken out of the dobby to be replaced by another pattern.

The paper pattern is usually in the form of anV endless loop and previous dobbies have employed feeding mechanism located within the loop. It is another object of my present invention to locate the feeding cylinder outside the pattern loop land mount guide rolls within the loop on open bearings to permit their ready removal. Such aconstruction permits the removal of a sheet pattern from the dobby with very little disturbance of the parts which feed and guide the sheet pat- Itis desirable to be able to inspect the plung ers and associated parts and also be able to clean the carriage on which the plungers are mounted. In order to provide for these conditions and alsof afford accessibility it is a further object ofv my invention to provide a drive for the carriage sofconstructed that the latter can swing away from its normal position under the hook lifter wires.

During the normal operation of the dobby the' paper pattern should be held stationary during the pattern reading interval and in order to in sure this condition it is a further object of my present invention to provide a lock for the feed'- ing cylinder which will preventits rotation when the reading plungers are projecting through the paper. A more specific feature ofthe lock is its connection to the leveller for the plungers so that when the latter are moved to an abnormal low position for reasons already mentioned the lock will be disengaged from the feed cylinder to permit the carriage to swing as already mentioned.

With these and other objects in view which will appear as the description proceeds, my invention resides in the combination and arrangeyment of parts hereinafter described and set forth.

In the accompanying drawings, wherein a convenient embodiment of my invention is set forth, Fig. l is a front elevation of a dobby mader according to my present invention,

Fig. 2 is an enlarged detail front elevation of the lower part of Fig. 1,

Fig. 3 is a detail vertical section on line 3 3, of Fig. 2,

Fig. 4 is an enlarged end elevation partly in section looking in the direction of arrow 4, Fig. 1,

Fig. 5 is a detail end elevation showing the driving gear for the feed cylinder,

Fig. 6 is a detail rear elevation, looking in the direction of arrow E, Fig. 4, parts being omitted,

Fig. 7 is a modified form of the invention showing feeding and guiding mechanism for the sheet pattern which may be substituted for the mechanism shown in Fig. 2,

Fig. 8 is a diagrammatic plan View of the plunger carriage showing the manner in which the same may be swung away from normal posi tion,

Fig. 9 is a vertical section on line 9 9 of Fig. 4,

Fig. 10 is a plan view looking in the direction of arrow IIJ, Fig. 4, and

Fig. 1l is a plan View of the paper pattern.

Referring particularly to Fig. l, I have a shown a loom frame lil on which is mounted' a stand il' to support the dobby designated generally at D2 The dobby comprises front and back plates f2 and i3, respectively, between which extends a pin i4 on which is pivotally mounted a series of harness lifter jacks I5. Each jack has pivoted thereto a jack lever it having upper and lower hooks I1 and i8, respectively, pivoted thereto. Relatively long and short lifter wires 26 and 2|, respectively, are provided for top and bottom hooks to determine their vertical position.

Journaled for rotation in the dobby frame is a rock shaft 23 having at the rear end thereof a three-armed lever 24 one arm of which is attached to a vertical operating rod 25 which.

may if desired be driven by the bottom shaft of the loom not shown to cause the shaft 23 to rock to the right on one pick of the loom and to the left on the next pick. The dobby plates have top and

bottom slots

21 and 23, respectively, in which slide top and bottom knives 29 and 3B, respectively. A front lever 32 is secured to shaft 23 and moves with rear lever 24. The knives are attached by means of connectors 3| to the levers on shaft 23 and the relationship of the knives is such that as the top knife is moving out or to the left on one pick as seen in Fig. l the bottom knife moves inwardly, and on the next pick the direction of the knives is reversed.

Cross combs

33 and 34 between plates I2 and |31 are provided to support the upper hooked ends of lifter wires 25 and 2|, respectively.

That part of the structure already described is of common construction and except as pointed out hereinafter may be made and operated in the usual manner.

My invention relates more particularly to the mechanism for controlling the vertical position of the lifter wires 20 and 2| and in carrying my invention into effect I provide a bottom guide plate 35 which may be held in xed horizontal position on front and

back brackets

35 and 31, respectively, secured to their corresponding dobby side plates. The guide 35 is perforated as at 38 to receive the lower ends of the wires 20 and 2|. A second `plate 4G secured to the

brackets

36 and 31 above plate 35 is also perforated to receive the lifter wires and hold them centrally with respect to the perforations 38. The rear or left bracket 31 as viewed in Fig. 4 has secured thereto for adjusted vertical position a guide post 43 held in adjusted vertical po'- sition by nut 44 and having the lower end thereof extended through a sleeve 45. The sleeve extends through upper and lower ears 46 and 41, respectively, of an arm 48 provided with a roll 49 having a flange 55, and resting on a cam 5| secured to a shaft 52 parallel to and behind plate I3. Bearings 53 on plate I3 support shaft 52.

The carriage C comprises a rear vertical plate `55 having top and bottom

horizontal flanges

56 and 51, respectively, and has secured thereto a bearing block 58 having a bearing 59 located between the ears 46 and 41 and through which the sleeve 45 passes. The block 58 also has a rear extension 6i) carrying a horizontal stud 5|. The forward end of plate 55 has secured thereto a second block 65 provided with forwardly eX- tending spaced vertical parallel guide ears 66 between which is normally located a hook 61 pivoted as at 68 to front bracket 36 above the guide plate 35. Hook 61 has the lower end thereof provided with a horizontal tread 16, and a yieldable spring lock 1| secured to the front dobby plate I2 cooperates with hub 12 of the hook to hold the latter yieldably either in the full or dotted line position shown in Fig. 4.

A bell crank lever is pivoted on the stud 6| at the rear end of the dobby and carries a roll 'I6 for engagement with the lower flat end of post 43. Lever 15 has a depending arm 18 attached to a connector rod 19 which extends forwardly to be connected to the depending arm of a lever 8| pivoted as at 82 to the block 65 which is fastened to the vertical plate 55 of the carriage. Lever 8| has a forwardly extending arm 63 on which is mounted a roll 84 for engagement with the tread 1B.

The carriage has associated therewith a leveler 81 having a top flange 88 extending under and close to the top flange 56 of the carriage. Plungers for operating the lifter wires are mounted on the carrier and each plunger comprises a stem 9U having a head 9| which projects upwardly through the flanges 56l and 88 and through a pattern rest or guide plate S2 located below plate 35 suiciently to receive the paper pattern P. Each plunger stem has a shoulder 33 which limits upward motion of the plunger with respect to flange 88 and has also a second shoulder 94 which receives the upward thrust of a compression spring 95 surrounding the lower part of the stem. The bottom of each stem passes through the bottom flange 51 and the latter limits downward motion of the springs 95. The plungers are arranged in two parallel rows disposed transversely of the dobby.

The pattern designated at P in Fig. 1l may be made of any approved sheet material such as a paper of sufficient strength to withstand the pressure of the plungers 9|). The paper is provided with pairs of transverse pattern determining zones comprising perforations Illl and unperforated portions I 0 I Assuming that the pattern is positioned rwith a pair of zones over the plunger heads 9|, the cam 5| will raise the arm 48 and cause the same to slide along the post 43. This upward motion of arm 48 causes the bottom ear 41 to lift bearing 59 thereby elevating stud 6| and raising lever 15. The latter thereupon turns in a clockwise direction as viewed in Fig. 4 and exerts a rearward pull on rod I9 to cause a corresponding clockwise angular motion of lever 8|.. The tread 10 on which roll 84 rests is held stationary by the fixed pivot 68 and lever 8| is raised to elevate pivot 82, ears 66 sliding upwardly along hook 61. The blocks 5B and 65 therefore rise simultaneously and raise the plunger carriage fastened to them. Those plungers which align with perforations |00 pass through the latter and raise the corresponding lifter wires to place the associated hooks in the paths of their dobby knives. Those plungers which are aligned with the unperforated portions Il are kept down with attendant compression of their springs 95 and the corresponding lifter wires remain down and do not lift their associated hooks.

When the low part of cam 5I starts to move under roll 45, stud 6| and the carriage C fall by gravity. The stationary tread 10 prevents downward motion of the roll 84 and the weight of the front end of the carriage exerts a downward force acting through pivot 82, Lever 8| therefore tends to turn counterclockwise around the rolling contact between roll 84 and tread 10. The amount of this turning is dependent upon right hand motion of rod 19 which in turn is limited by movement of pivot 6| and roll I6 rolling along post 43.` Levers 'I5 and 8| are equal as to the lengths of their corresponding arms and both ends of the carriage therefore descend together. It is to be understood that the cam 5| is so actuated as to lift the carriage every other pick of the loom preferably shortly before the bottom knife starts on its outward or left hand motion as viewed in Fig. 1, and the cam maintains the carriage in raised position for slightly more than a pick, or until after the top knife has started on its outward or left hand motion.

Another feature of my invention relates to the leveling or lowering of all of the plungers 90 with respect to the carriage to permit the paper pattern to be moved manually without danger of being torn- In carrying Vthis feature of my l invention into effect I provide a horizontal rod I I having a hand hold I I and pivot. the bar to a pair of toggles. Each toggle includes an upper link H2 pivoted as at H3 to the upper part of plate 55 and pivoted at its lower end to the bar at I III. A second or lower link ||5 of each toggle is pivoted to the bar at ||4 and has a stud I I6 on its lower end secured to the plate 01 and projecting through a vertical slot I |1 in the plate 55. Normally the pressure of the several springs 95 hold the flange S8 in high position against the flange 56 and the toggles will be angularly disposed as indicated in Fig. 4. When it is desired to depress all of the plungers the hand hold III is moved to the right, Fig. 4, to straighten the toggles and cause lowering of the studs IIE and the plate 81, thereby moving the ange 8S and the shoulders 93 downwardly to lower the heads 9| to a position under the pattern sheet. A stop pin H8 on bar ||0 engages a lug I IS o-n wall or plate 55 to hold the plungers yieldingly locked in down position. When the plungers are thus lowered the hook 61 can be swung from the full to the dotted line position in Fig. 4 to permit removal of the pattern sheet and its replacement by another pattern. The carriage can also be rocked angularly from the full to the dotted line position of Fig. 8 to permit removal of any damaged plunger and to facilitate handling of the pattern sheet, or cleaning of the carriage,

The pattern guide 92 has the rear end thereof held in fixed position by a cap screw threaded into the rear stand or bracket 31 and having a large head under the Vleft end of the guide 92 as seen in Fig. 4. Normally the right end 'of guide 92 will be supported by a screw |2| adjustably threaded into a lug |22 projecting to the left from the hook 51. When the hook is held in the full position shown in Fig. 4 the screw |2'| supports the right or forward end of the plate 92. When 'the hook is swungl to the dotted line position shown in Fig. 4 the lug I 22 and its supporting screw swing above the plate 92. At this time the large head of the cap screw |20 will suffice to hold the guide 92 in position so that a pattern sheet between the

guide

35 and 92 can be removed by movement to the right under the hook and replaced by another pattern the left edge of which will pass under the hook, over guide 52 and under the plate 35. When a new pattern is in position the hook is moved from the dotted to the full line position and the hand hold III pushed to the left to release the plungers and permit them to rise to their normal position with respect to the carriage. Clips |23 on plate 35 extend down to guide plate 92 when the latter is released at the time the hook 61 is swung up to remove the pattern sheet.

In order that full advantage may be taken of the ability to insert a pattern between the

guide plates

35 and 92 when the hook is raisedv I also` provide an improved pattern feeding and guiding mechanism, the preferred form of which isshown in Figs. l, 2 and 3. The sheet pattern P v.as-shown in Fig. 1l may Ice-trained around-a` 75.'

series fof guide rolls |25y which. may be supported as suggested in Fig.. .l by having their gudgeon's |25 received. zby open bearings 1|.21,. This construction permits the rolls to be removed readily and `slipped endwise from. within the loop which the continuous `pattern sheet forms.

The feed cylinder is mounted so that it is on the outside ofthe loop to avoid the necessity of passing it through the. loop in order to establisli driving vconnection with. the pattern sheet. The cylinder rotates in xed front and back bearings ISI and |32, respectively, supported by the dobby frame and has a cylindrical body |33 from which project feed pins |34 which enter marginal perforations |35 along the front edge of the pattern and vhas also feed pins |36 projecting therefrom near the rear of the cylinder to enter elongated perforations |31 formed along the rear margin of the sheet pattern. A guide roll |40 received by open bearings 4| is close to the cylinder |353 and the pattern sheet feeds from this guide roll |40 to the cylinder in the direction of arrow a, Fig. 2, and then passes to the space between the

guides

35 and 92.

The feed cylinder is secured to a shaft |42 on which is fastened a Worm Wheel |43 to mesh with a worm |44'on shaft 52, as indicated in Figs. 6 and 10. Since shaft 52 makes a rotation every second pick of the loom vthe cylinder is given Aan advance feeding motion on alternate picks to move the pattern with respect to the carriage and itsplungers when the latter are in the low position shown in Fig. 4. With the construction shown in Fig. 2 the paper pattern is fed from a point outside the loop toward pattern reading position.

In order that the cylinder may be locked when the carriage is rising to prevent movement of the paper pattern with respect to the plunger heads 92 and avoid tearing of the pattern I provide the cylinder with a lock wheel |46, see Figs. 2 and 3, having spaced slots |41 adapted to receive a locking blade |48 mounted on the upper end of an arm |49 which is secured to plate 81 as suggested in Figs. 2, 3 and 4. The lock |48 will enter one of the slots |41 -as soon as the carriage starts to lift the pattern reading plungers and in this way movement of the feed cylinder and therefore the pattern sheet in a forward or backward direction is prevented. Whenever plate 81 is depressed by movement of bar I0 to the right the wire |49 will move downwardly to take the lock out of the slot |41 which it occupied before leveling of the plungers.

In the matter thus far described the pattern sheet Vis pushed forwardly by the cylinder to 1ocate its perforated and unperforated zones in pattern reading position. I do not wish however to be limited to this manner of advancing the pattern sheet-and if desired the construction shown' in Fig..7 may be employed. In this second or f. modifiedl instance ther-matter thusVVV far describedL with respect to the plunger carriage and guides for the pattern sheet will be used, but a cylinder |60 similar as to its drive and other features to cylinder |33 is mounted to the right of the pattern feeding position and turns in the direction of arrow b to pull the pattern sheet through its

guide plates

35 and 92. Guide rolls |6| may be located adjacent to the feed cylinder |60 to insure proper driving relation between said cylinder and the pattern sheet P'. An auxiliary guide |62 may be provided at such a level as to feed the paper pattern in a horizontal plane to the pattern reading position.

In order that the arm or lever 48 may be held in fixed angular position with respect to the carriage under normal conditions, and may remain engaged with cam when the carriage is swung as indicated in Fig. 8, I employ certain structure shown in Fig. l0. The flange 60 which overhangs lever 48 is provided with a pin |65 which extends downwardly into the lever 48 as indicated in Fig. 4. This pin is normally in position to hold the lever 48 in the position shown in Fig, with respect to the carriage when the latter is in normal operating position, but when the carriage is to be swung to the position shown in Fig. 8, the pin |65 is removed. The arm 48 extends downwardly in front of cam 5| as viewed in Fig. 4 and prevents right hand motion of the arm around the post 43 when the carriage is swung to the dotted line position in Fig. 8. When the carriage is returned to its normal position the previously described ange 5!) engages that side of cam 5| opposite the arm 48 and prevents the roll from becoming disengaged from the cam. The arm 43 therefore is always operatively related to the cam 5|, both during normal conditions and when the carriage is swung away from its normal position.V

From the foregoing it will be seen that I have provided a dobby so constructed that an endless paper pattern can be easily inserted into the dobby after being cemented to form a loop. It will further be seen that the plunger carriage can be swung angularly from its normal position and that the pivot around which it turns is the post 43 which serves also as a support for the roll 73 during vertical motion of the carriage. It will further be noted that the plungers can all be leveled by means of a rod ||0 and that hook 61 swings upwardly to a position out of the path of the pattern when the latter is being placed between the guide plates and 92. Also, the pattern feeding cylinder is outside the endless loop and can therefore be mounted on fixed bearings which need not be disturbed when a new pattern is being placed in the dobby. The lock |43 on the feed cylinder holds the latter stationary while the plungers are in raised position to prevent tearing of the pattern. Again, the hook by its screw |22 supports the plate 92 under normal conditions, but the screw and its arm swing clear of the pattern sheet when the hook is raised.

Having thus described my invention it will be seen that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the inventionand I do not wish to be limited to the de-l tails herein disclosed, but what I claim is:

l. In a loom dobby having a pattern readingv mechanisn'i an endless sheet pattern in the form of a loop having pattern zones and located around said reading mechanism, support means for the pattern sheet so constructed that the sheet pat-- tern is movable endwise of said support means, yand feed means for the sheet pattern located outside the loop to engage the sheet `pattern and 'advance said zones successively to pattern reading position with respect to said reading mechamsm.

2. In a loom dobby having a frame and operating with a set of pattern reading elements, an endless sheet pattern in the form of a loop having pattern zones, av feed cylinder for said sheet pattern, bearings on the dobby frame for the feed cylinder mounted to locate the latter outside said loop, means outside of said loop to turn the cylinder in a direction to feed said zones successively to pattern reading position with `respect to said set of elements, and support means for the pattern sheet so constructed that the pattern loop is removable from the dobby while said bearings and feed cylinder are in normal position on the dobby frame.

3. In a loom dobby having a set of pattern reading elements, an endless sheet pattern having pattern zones movable to reading position with -respect tol said set of elements, feed means engaging the sheet pattern and located on the outside of the pattern loop to move said zones progressively to feeding position with respect to said set of elements, and support means for the pattern loop so constructed that the pattern loop is removable from the dobby while the feed means is in normal position.

4. In a loom dobby having a pattern reading mechanism, an endless sheet pattern in the form of a loop having feed perforations and provided with pattern zones movable to feeding position with respect to said elements, feed means located outside of said loop and spaced from said reading mechanism in the direction in which the sheet pattern moves cooperating with the feed Iperforations and advancing the sheet pattern to move said Zones progressively to reading position, and support means for the pattern loop so constructed that the pattern loop is removable from the dobby while the feed means is in normal position.

5. In a loom dobby having a frame and operating with an endless sheet pattern in the form of a loop, a set of pattern reading elements for the sheet pattern, Aa carriage for said set of elements, said elements and carriage located within said loop, a support for said carriage extending across the endwise projection of said loop, and means to mount said support on the dobby frame on that side of said projection opposite said carriage for movement relatively to the frame to a position out of said projection and the path of the sheet pattern when the latter is removed from the dobby by an endwise movement away from said set of elements and carriage.

6. In a loom dobby having a frame and operating with an endless sheet pattern in the form of a loop, a carriage within said loop including pattern reading elements, means at one side of said loop lying in the path of lateral movement of said loop when the latter is removed by endwise movement parallel to said carriage to support the carriage with the elements in pattern reading position, and a connection between said means and the dobby frame on that side of said path opposite to said carriage and so located that said means is movable to a position out of the path of the sheet pattern when the latter is moved endwise away from said carriage.

'7. In a loom dobby having a frame and operating with an endless sheet pattern in the form,

of a loop, a carriage including a set of pattern reading elements mounted Within said loop, a support for one end of said carriage extending from one side of said loop to the other side thereof, actuating means cooperating with said support to move the carriage toward and from the sheet pattern, and a connection between said support and the dobby frame on that side of said loop opposite to said carriage and so located that said support is movable away from said means to a position out of the path of the sheet pattern when the latter is moved endwise away from said carriage.

8. In a loom dobby having a frame and operating with an endless sheet pattern in the form of ya loop having a portion thereof in pattern reading position, a carriage including a set of pattern reading elements located within said loop to cooperate with said portion, a support for said carriage extending from one side of said portion of the sheet lpattern to the other-side thereof, and a pivotal mounting for said support located out of alignment with said portion of the sheet pattern, whereby said support is movable pivotally to a position out of the path of the sheet pattern when the latter is moved endwise away from said carriage.

9. In a loom dobby having a frame and operating with an endless sheet pattern forming a loop,V a feed cylinder mounted for rotation on the frame and'having driving relation with respect to the sheet pattern and located on one side of said loop, pattern reading mechanism located on the other side of and within the loop, means extending Within the loop to move the reading mechanism toward and from the pattern sheet, a support for said means extending'from one side of said loop to the other side thereof, and a pivotal connection between said support and the-dobby frame out of alignment with said loop and located on that side of the latter opposite to said reading mechanism to permit said support to move to a position out of the path of the sheet pattern when the latter is moved laterally with respect toV said reading mechanism.

10. In a pattern reading mechanism for a loom dobby operating with a sheet pattern, a flat carrier member extending transversely of the sheet pattern, a set of pattern reading. members mounted on and movable with respect to the carrier, a leveler movable with respect to the carrier and in engagement with the members, and manual v means to move the leveler relatively to the carrier in a direction laway from said sheet pattern to move said members out of engaging position with respect to said sheet pattern.

1l. In a pattern reading mechanism for a loom dobby operating with a sheet pattern, a carrier extending transversely of the sheet pattern, a set of pattern reading members mounted on and movable with respect to the carrier, a leveler mounted for movement with respect to the carrier and engaging said members, and mechanism including linked elements connected to the carriage and the leveler to move the leveler and the members relatively to the carriage in a direction away from said sheet pattern.

12. In a loom dobby having a frame and operating with a sheet pattern, pattern reading mechanism for the sheet pattern, means to move the reading mechanism toward and from the sheet pattern, a guide for the reading mechanism extending transversely of the sheet pattern, and means on the reading mechanism to engage said guide and constitute both a pivotal and sliding connectionbetween said guide and reading mechanism aroundv which'the latter is movable angularly in a direction substantiallyy parallel to the sheet pattern and along which the reading mechanism moves toward the sheet pattern.

13. In a loom dobby having a frame and operating with a sheet pattern having transverse pattern zones, pattern reading mechanism normally aligned with a-pattern zone of the sheet pattern, means to move the reading mechanism toward the sheet pattern, and guide means transverse of the sheet pattern along which the'reading mechanism slides When moving toward the sheet pattern and around which said reading mechanism is movable as a pivot to swing" away from normal position.

lli. in a loom dobby having a frame and operating with a sheet pattern having transverse pattern Zones, positioning means to hold one of the zones in reading position, pattern reading mechanism normally aligned with the positioning means and said one zone, means to move the pattern reading mechanism toward the positioning means and said one zone, land a combined slide and pivot member xed with respect tothe frame along Which the reading mechanism slides when moving toward the positioning means and around which the reading mechanism is movable as .a pivotr to move away from the positioning means and out of alignment therewith,

In a loom dobby havingla. frame andvoperating with a sheet pattern having pattern zones movable to pattern reading position, pattern reading mechanism normally aligned with a zone in reading position, means to move the pattern reading mechanism toward the zone in reading position, and means constituting a combined sliding and pivotal connection between said reading mechanism and the dobby frame along which the reading mechanism slides when moving toward the zone in reading position and around which the reading mechanism is movable as a pivot to move in a direction away from normal position with respect to the sheet pattern.

16. In a loom dobby having a frame land operating with a sheet pattern having pattern zones, a feed cylinder for the sheet pattern to move the zones successively to pattern reading position, pattern reading mechanism for the zone of the sheet pattern in pattern reading position, means to move the pattern reading mechanism toward the sheet. pattern, and lock means including a part moving with the pattern reading mechanism and another part moving with the feeding mechanism to cooperate with the first named part to prevent movement of the feeding mechanism when the pattern reading mechanism is in reading position with respect to the sheet pattern.

17. In a loom dobby having a frame and operating with a sheet pattern, a feed cylinder for the sheet pattern to move the latter, pattern reading mechanism for the sheet pattern, means to move the pattern reading mechanism toward and into pattern reading relation with respect to the sheet pattern, a lock element moving with the feed cylinder and provided with spaced slots, and means carried by the pattern reading mechanism to enter said slots one at a time to prevent movement of the feed cylinder when the reading mechanism is in pattern reading position with A respect to the sheet pattern.

the frame and extending in a direction trans- Versely of the sheet pattern and at one side thereof, pattern reading mechanism mounted on said guide to slide therealong, a lifting element slidable along said guide and connected to the reading mechanism, a pair of levers pivotally mounted on the reading mechanism, one at each end thereof, one of said levers engaging the guide on one side of the sheet pattern, a support for the other lever on the other side of the sheet pattern, and means to cause said levers to move in unison, said levers effective When said element slides along said guide to cause both ends of the reading mechanism to move in unison relatively to the sheet pattern.

19. In a loom dobby having a frame and operating With a sheet pattern, pattern reading mechanism movable toward and from the sheet pattern, a pair of similar levers mounted on the pattern reading mechanism, one on each side of the sheet pattern, means to cause said levers to move in unison, stationary means on the dobby frame to engage corresponding parts of said levers, and actuating means located on one side of the pattern sheet to move said reading mechanism toward the sheet pattern, said levers eiTective to cause both ends of the Weaving mechanism to move in unison toward the sheet pattern by a force derived from said actuating means.

20. In a loom dobby having a frame and' operating with a sheet pattern, a pattern reading mechanism movable toward the sheet pattern,

two similar levers pivotally mounted on the pattern reading mechanism, one lever at each end of the latter, means connecting corresponding arms of said levers to cause the latter to move in unison, xed means to engage the other arms of said levers, and actuating mechanism to move one of said levers and thereby cause both of said levers to move in unison and cooperate with the iixed means engaging said other arms of the levers to cause the opposite ends of the pattern reading mechanism to move in unison relatively to the sheet pattern. y

21. In a loom dobby having a frame and operating with an endless sheet pattern forming a loop, pattern reading mechanism within the loop to cooperate With the sheet pattern, feed mechanism for the sheet pattern to advance the latter toward the pattern reading mechanism and 1ocated on that side of the loop opposite to said reading mechanism, support means for the pattern reading mechanism including an element extending from one side of the sheet pattern to the other side thereof, and means to mount said element on said frame on that side of said sheet pattern opposite to the reading mechanism for movement relatively to the reading mechanism and frame to a position out of the path of the sheet pattern when the latter is moved endwise away from said feeding and reading mechanisms.

CLARENCE R. KRONOFF.