US3517703A

US3517703A - Heald control and drive mechanism for double lift dobbies

Info

Publication number: US3517703A
Application number: US740550A
Authority: US
Inventors: Rudolf Schwarz
Original assignee: Staubli Geb & Co
Current assignee: Gebr Staubli & Co; Staubli Geb & Co
Priority date: 1967-06-27
Filing date: 1968-06-27
Publication date: 1970-06-30
Anticipated expiration: 1987-06-30
Also published as: DE1760394A1; CH480463A; FR1604836A; BE717092A; GB1236412A

Description

30, 1970 v nf uwaz 3,517,103

11mm CONTROL AND DRIVE uncnmrs u FOR DOUBLE LIFT 'DOBBIES ,4 Shets-Sheet 1 Filed June 27, 1968 June 30,1970 R, 3,517,703 v HEALD cannon AND muvs MEOBANI Sll-FOR DOUBLE um DOBBIES I 4 sheets-s ee 2 Filed June 27, 1968 I 15-. 17a "Ir-1321 19 Ill/III/l/l/l/f/ R. scHwAi Z' I 3,517,703

4 Sheets-Sheet 3 June 30, 1970 HEALD CONTROL AND DRIVE MECHANISM FOR DOUBLE LIFT DOBBIES Fild June 27, 1968 R. SCHWARZ 3,517,703

HEALD CONTROL AND DRIVE MECHANISM FOR DOUBLE LIFT DOBBIES June 30, 1970 4 Sheet s'-Sheet 4 Filed June 27, 1968 Fig. 5

United States Patent M US. Cl. 139-68 Claims ABSTRACT OF THE DISCLOSURE In a double lift dobby having a heald control and drive mechanism comprising a baulk with attachment hooks, a pivotal connection between the baulk and the attachment hooks permits a rotative swinging movement and also a straight line movement in the plane of the baulk.

This invention relates to a heald control and drive mechanism comprising a baulk and attachment hooks for dobby machines of the Hattersley type, especially double lift dobbies.

Dob'bies of the Hatersley type have for each heald of the loom a baulk which is pivoted at its center to the heald-operated lever and at each end of the baulk there is an attachment hook, which according to the control setting is carried along by a pusher bar swinging to and fro, which involves the lifting of the heald into the raised position.

Doublelift dobbies are known in which the attachment hooks are in the form of double hooks with a positive hook attaching movement. This positive movement makes a faster operation of the machine possible, as the alternate engagement and disengagement with the one or the other pusher bar or with a stationary bar is not left to chance, but the time sequence is exactly known and can be controlled.

In operation, the freely movable baulk performs a swinging movement about the central attachment point of the jacklever, this point also performing a relative movement. According to whether during the alternate pulling movement of associated pusher bars, the one or the other or both ends of the baulk is or are driven, the position of the pivot points of the baulk ends changes with respect to the hooks. In the known dobbies of the Hattersley type, especially with simple hooks, the relatively great length of the hooks serves to compensate for these changes of position.

Also the baulk end slides up and down on the stationary impact bar and on the stop beams, which causes wear due to friction. These changes of position are very disadvantageous with double hooks with positive locking, the position of which with respect to the opposite hooks should not change.

In order to avod these drawbacks, the heald control and drive mechanism according to the invention is charterized by the feature that the articulated connection between the baulk and the attachment hook allows a rotational swinging movement as well as a straight line movement in the plane of the baulk.

In such a control and drive mechanism, with a plate connecting the balance and the attachment hooks, the plate may, for example, have a bolt-like hub or projection with a slot extending transversely to the shaft axis and a sliding block arranged movably therein, the sliding block having a bore in which a bolt of one of the parts to be connected is swingably arranged while the 3,517,703 Patented June 30, 1970 other part to be connected is swingable on the bolt-like hub or projection.

Such arrangement can, for example, be used very advantageously in heald control and drive mechanisms having an attachment hook which is swingable with respect to the baulk and is constructed as a double hook, one hook of the double hook being capable of engaging the swinging, pulling and pushing ar and the other hook engaging the stationary impact or arrester bar.

In the drawing a constructional example of the invention is illustrated.

FIG. 1 is a diagrammatic illustration of the mode of operation of a dobby machine of the Hattersley type with double hooks.

FIG. 2 shows in detail the arrangement of the baulk with the double hook in the position in which it is not drawn out.

FIG. 3 shows the same arrangement according to FIG. 2 in the drawn-out position.

FIG. 4 is a section on the line IVIV in FIG. 2, and

FIG. 5 is a section on the line VV in FIG 2.

The jack lever 2 which through the various connection bars 3 determines the position of the heald 4 is pivoted at the center of the baulk 1. At each end of the baulk 1 an attachment hook 5 is swingably arranged and according to its position comes into engagement with the arrester bar 6 or with the pulling and pushing bar 7 which swings to and fro about the axis 25 as indicated by the arrow A.

The pulling and pushing bar 7 draws a hook which is engaged with it forwards and pushes the end of the baulk back into its initial position by means of the plate 13. The control device for the attachment hooks is the perforated pattern card 8 from which the reading needles 9 read off the pattern and the draw bars 10 which, according to their position, carry the connecting levers 11 with them.

In FIGS 2 and 5 a section of the control and drive mechanism is shown in which the parts arranged at the two ends of the baulk are similar and therefore have the same reference numerals.

The baulk 1 consists of two spaced parallel plates between which the bolt 12 is arranged. The attachment hook 5 is constructed as a double hook and comes into engagement according to its position with the arrester bar 6 (FIG. 2 below) or with the pulling and pushing bar 7 (FIG. 2 at the top).

Between the hook 5 and the baulk is the plate 13 hav ing a hub-like extension 14 on which the hook 5 is swingably mounted. In the hub or projection 14 there is a slot 15 extending transversely to the shaft axis and in line with the bolt 12 of the baulk 1, which slot serves as a guide for the sliding block 16. The block 16 serves as a bearing for the bolt 12 of the baulk 1. In addition, the plate 13 has recesses 17 and autment surfaces 24 which are shaped to receive mating portions on the pulling and pushing bar 7 or the arrester bar 6.

A spring 18 bears on the plate 13 and tends to swing the attachment hook so as to engage with the pulling and pushing bar 7. A bar 19 operates against the force of the spring 18 and is moved to and fro by a cam disc (not shown) on the drive shaft of the dobby.

The transmission of the control impulses derived from the pattern card 8 is effected by means of a lever 21 which is swingable on a shaft 20 which co-operates with the surface 22 of the hook 5.

Each time the pulling and pushing bar 7 is in the rear dead center position (FIG. 3 below), the plate 13- being held between the pulling and pushing bar 7 and the arrester bar 6, the bar 19 presses on the hook 5 through the rod 23 and thus swings the hook in a counter clockwise direction. The hook 5 engages with the arresting rail of the bar 6. If, at the next drawing out movement of the pulling and pushing bar 7, the end of the baulk is to be controlled so as not to be moved, the lever 21 tilts in front of the surface 22 and thereby locks the position of the hook 5. As shown in the lower part of FIG. 2 the end of the baulk is held in engagement with the arrester bar and not moved during the drawing'out movement of the pulling and pushing bar 7 even when the bar 19 is retracted.

If on the other hand the pulling and pushing bar 7 is to take the baulk end with it on its next drawing out movement, as is shown in the upper part of FIG. 3, the lever 21 remains out of range of engagement with the surface 22 (as shown in the upper part of FIG. 2). As the bar 19 yields, the spring 1 8 now presses on the hook 5 until the hook engages the pulling and pushing bar 7. Since the plate 13 rests on the pulling and pushing bar 7 and on the hook 5, and also engages behind the arresting rail of the pulling and pushing bar, the attachment hook is guided without play during the whole of the drawing out movement of the pulling and pushing bar 7. As described, the hook which is not drawn out also rests without play on the arrester bar 6. These positionings act on the ends of the baulk free from play. The control and drive mechanism would not operate it there were only a pivotal connection between the attachment hooks and the ends of the baulk. A comparison between FIGS. 2 and 3 shows that both the distances between the attachment hook centers and also their relative position have changed. This is one of the reasons for swingably mounting the hooks 5 on the projection 14 of the plate. In addition, due to the movability of the block 16 in the slot 15, the bolt 12 can move away from the center of the hook 5 as is evident from the relative position of the bolt 12 and the corresponding hook 5 in FIG. 3.

What I claim is:

1. In a double lift dobby: a heald control and driv mechanism comprising; a baulk, a pair of movable pushing-and-pulling bars, a pair of stationary arrester bars, a pair of attachment hooks each mounted to selectively engage with one of said pushing-and-pulling bars and with one of said arrester bars, and means pivotally connecting each of said attachment hooks to said baulk for both pivotal movement relative to said baulk and translational movement in the plane of said baulk; said lastmentioned means comprising a plate having a hub-like projection on which said attachment hooks are pivotally mounted, a guide slot within said hub-like projection and extending transversely to the pivotal axis of said attachment hooks, and a slide block pivotally connected to said baulk and slidably positioned in said guide slot.

2. A dobby according to claim 1; wherein said guide slot extends parallel to a line connecting the pivot points of said attachment hooks when said baulk is not drawn out and maintains this orientation during movement of said baulk.

3. In a double lift dobby: a heald control and drive mechanism comprising; a baulk, a pair of movable pushing-and-pulling bars, a pair of stationary arrester bars, a pair of attachment hooks each mounted to selectively engage with one of said pushing-and-pulling bars and with one of said arrester bars, means including a plate pivotally connecting each of said attachment hooks to said baulk for both pivotal movement relative to said baulk and translational movement in the plane of said baulk, said plate having recesses therein shaped to receive without play mating portions of said pushing-andpulling bars and said arrester bars when said pushingand-pulling bars and said arrester bars are engaged with said attachment hooks.

4. A dobby according to claim 3; including spring means continually tending to move said attachment hooks into engagement with said pus hing-and-pulling bars.

5. A dobby according to claim 4; including means for moving said attachment hooks against the force of said spring means into engagement with said arrester bars, and means for holding and locking said attachment hooks in engagement with said arrester bars.

References Cited UNITED STATES PATENTS 1,841,923 1/1932 Waters 13974 2,421,599 6/1947 Cash 139-74 2,705,506 4/ 1955 Staubli 139-71 3,285,291 11/1966 Favre 13968 FOREIGN PATENTS 155,357 2/ 1954 Australia. 959,899 3/1957 Germany.

12,331 1893 Great Britain. 853,856 11/1960 Great Britain.

JAMES KEECHI, Primary Examiner US. Cl. X.R. 139-41, 74