US3450168A - Device for turning off the vertical movement of the printing bar or grid during the return movement of a double-stroke jacquard machine - Google Patents

Description

J1me 1969 K. HABERHAUER ETAL 3,

DEVICE FOR TURNING OFF THE VERTICAL MOVEMENT OF THE PRINTING BAR OR GRID DURING THE RETURN MOVEMENT OF A DOUBLE-STROKE JACQUARD MACHINE Filed July 6, 1967 Sheet. of 2 June 1969 K. HABERHAUER ETAL 3,450,153

DEVICE FOR TURNING OFF THE VERTICAL MOVEMENT 0F THE PRINTING BAR 0R GRID DURING THE RETURN MOVEMENT OF A DOUBLE-STROKE JACQUARD MACHINE Filed July 6, 1967 Sheet 2 of 2 course of movement dur/ng return movem en! United States Patent US. Cl. 139-59 7 Claims ABSTRACT OF THE DISCLOSURE Double-stroke open shed jacquard loom in which a printing grid lifts drop wires away from a punched control element and moves the drop wires into engagement with the punched control element, with linkage connected to the printing grid for so moving it and under the control of a shaft driven cam, with a blocking lever connected to the shaft by a one-way drive operable when the shaft turns in forward direction to permit the cam to operate the linkage while in the reverse direction of the shaft the blocking lever engages the linkage when the printing grid lifts the drop wires away from the punched control member and holds the printing grid in that position as long as the shaft turns in reverse direction.

The present invention concerns a device for turning off the vertical movement of the printing bar or grid during the return movement of a double-stroke open shed jacquard machine with a cylinder drive shaft having mounted thereon the cam discs for the horizontal and vertical movement of the printing grid.

With heretofore known printing grids with similar movements, the course of movement for the return stroke is such that the head wires lifted by the drop wires or droppers will not contact the downwardly moving printing rails of the printing grid. In order to prevent said printing rails from being placed upon the tips of the head wires, whereby the droppers would be pressed into the punchcard, larger strokes are required for the movement of the printing grid, and furthermore a precise adjustment of the printing grid is required while in most instances the printing magnitude cannot be changed. Too large strokes, however, are disadvantageous with regard to the speed. When the printing grid is not properly adjusted, during the return movement a premature wear of the printing rails at the tip of the angles and of the punchcards will occur. Moreover, the bending of the droppers and head wires cannot be avoided.

According to another heretofore known jacquard machine in which a return safety device is provided which prevents the printing rails from being placed upon the head wires during the return movement, a frictionally operable blocking lever is provided which is adapted to turn off the vertical movement of the printing grid. The employment of a disc spring provided between the blocking lever and a rotating eccentric, which disc spring is also during the forward movement of the machine subjected to a continuous friction and thus to fatigue when used over a longer period of time, endangers the function of the safety device. With this type of machine it is generally suggested not to turn the machine backwards. This, however, is unavoidable in practice, for instance, when the direction of turning is incorrectly adjusted or when pick finding.

It is, therefore, an object of the present invention to 3,450,168 Patented June 17, 1969 provide a device of the above mentioned general type which will overcome the above mentioned drawbacks.

It is another object of this invention to provide a device for turning oif the vertical movement of the printing grid during the return movement of a double-stroke jacquard machine which will have a long life and throughout its life will work free from disturbances, will have a low rate of wear and will work with a minimum of servicing.

These and other objects and advantages of the invention will appear more clearly from the following specification in connection with the accompanying drawings, in which:

FIG. 1 diagrammatically illustrates a device according to the invention for turning oif the vertical movement of the printing grid during the operation in normal operation.

FIG. 2 is a top view of FIG. 1, partially sectioned.

FIG. 3 shows the position of the printing grid, leading wire mechanism and of the blocking lever during the return movement.

The above outlined objects have been realized according to the present invention by an arrangement which is characterized primarily in that on the cylinder drive shaft below the leading wire mechanism there .is journalled a blocking lever for rotation in one direction only, which lever is adapted to arrest the driving lever for the vertical movement of the printing grid in the position of its maximum stroke. In this condition, the blocking lever engages the foremost printing position. The driving lever frictionally engaging the cam disc is in this position lifted off the cam disc. As a result thereof, during the return movement the droppers remain lifted out of the punchcard, and the card cylinder can be advanced. The printing grid will then carry out only the horizontal movement which is controlled by the second drive.

When the drive is adjusted for operation direction, a roller of the driving lever will engage the cam disc and thereby free the blocking lever which will then engage the lower contact surface on the driving lever. By means of a freewheel drive which frictionally engages the blocking lever and the inner ring of which is positively connected to the cylinder drive shaft while the outer ring of said freewheel drive is at a standstill in view of the pressure exerted thereupon, laterally low friction will occur. By turning off the vertical movement of the printing grid during the return movement, it will be appreciated that after one revolution of the cylinder drive shaft all of the warps are lifted out and remain in the upper shed during the further return movement.

Since no further reading-in is effected, the head wires place themselves upon the printing rails of the printing grid, and the jacquard machine idles.

Referring now to the drawings in detail, the device shown therein comprises a cylinder drive shaft 1 ar ranged below the leading wire mechanism and provided with a pivot 1a having journalled thereon two flat rails 2 and 3. The flat rail 2 is provided with an angle-shaped nose 2a forming a blocking lever. The flat rail 3 serves as clamp for the outer ring 4a of a free-wheel drive 4 and by means of two discs 5 of synthetic material and by means of screws 6 and counter-nuts 7 is connected to the blocking lever 2.

When the cylinder drive shaft 1 turns in the direction of rotation (in clockwise direction in FIG. 1), a follower pin 8 turns the inner ring of the freewheel drive 4. The outer ring 4a of the ring 4a drive or overunning clutch 4 stands still against which freewheel the two discs 5 are pressed by means of flat rail 3 and blocking lever 2 by screws 6. The blocking lever 2 thus is at a standstill when in its basic position shown in FIGS. 1 and 2. A ball bearing 9 arranged at the lower end of rail 2 moves over the lower portion 10a of an oscillating driving lever 10 for the printing grid 21. The oscillating movement of lever 10 is produced by a cam roller 11 which unimpededly moves over a cam 12.

When the cylinder drive shaft 1 rotates in a direction counter to the direction of operation (in counterclockwise direction), the inner ring of the freewheel drive 4 which is positively connected to shaft 1 by the follower pin 8 is clamped against the outer ring 4a and due to the rotation of shaft 1 will through the pressed discs of synthetic material actuate the blocking lever 2 which latter first with its upper edge 21) engages a roller bolt 13. Cam disc 12 and the cylinder driveshaft 1 nonrotatably connected thereto turns relative to the blocking lever 2 until the driving lever 10 has reached its maximum angle of deviation. When the driving lever 10 in view of cam -12 has performed its maximum stroke, the rail 2 with its nose 2a is placed in front of the roller bolt 13 and during the further turning movement of shaft 1 keeps the roller 11 off the cam 12 as shown in FIG. 3. The printing grid 21 will carry out only the upper horizontal movement shown in heavier lines in the diagram of movement 14 in FIG. 3, and by means of lever '19, is held in its uppermost position. The head wires 15 place themselves upon the printing rails 16 and thereby lift the droppers 17 guided by the head wires 15 out of the punchcard 18. The lifting out of all droppers or dropper wire 17 is maintained as long as shaft 1 is turned backwardly.

When the device is again adjusted for turning in the direction of operation, the roller bolt 13 will when the cam roller 11 again engages the cam disc 12 be lifted out of nose 2a of rail 2. During the further course of the rotary movement, the unilaterally jouralled rail 2 will by means of its ball bearing 9 be placed upon the surface 10a of the driving lever 10.

Instead of the structural design of the device for turning off the vertical movement of the printing grid, which is shown in the embodiment of FIGS. 1, 2 and 3, also other embodiments may be provided which bring about an automatic lifting out of the droppers 17 and from the punchcard '18, for instance, for lifting off the driving lever 10 which frictionally engages the cam disc 12.

It will be noted that surface, or shoulder, 10a on the pivoted driving lever or link 10 is so directed that, when roller 9 is resting thereon, blocking lever 2 will be supported while lever 10 is free to swing unimpededly under the influence of cam disc 12. At the same time, blocking lever 2, which rests by its own weight on shoulder 10a, is close to its blocking position so that it quickly moves to blocking position when shaft 1 commences to turn in reverse direction.

It is, of course, to be understood that the present invention is, by no means, limited to the structural design of the device as shown in the drawings nad set forth above, but also comprises any modifications within the scope of the appended claims.

What is claimed is:

1. In a double-stroke open shed jacquard loom having a punch control element with dropper wires adapted to be moved toward and away (from the punch control element and head wires connected to the dropper wires for moving the dropper wires and engaging a printing grid and linkage and connected to the printing grid for moving it from a first position wherein the dropper wires are spaced from the punch control element to a second position where the dropper wires engage the punch control element and a cam is provided on a rotatable cylinder drive shaft which cam engages said linkage for moving said printing grid in the aforesaid manner, said shaft having a forward direction when the loom is operating and having a reverse direction; said linkage comprising a pivoted drive lever resting on said cam and operable when displaced outwardly from the shaft by the cam to a first position to move said punching grid to its first position, and a pivotally supported blocking lever having a blocking position wherein it engages said drive lever and holds the drive lever in first position and an unblocking position wherein it releases said drive lever for actuation by said cam, and drive means connecting said blocking lever to said shaft for movement of said blocking lever into unblocking position when the shaft turns in forward direction and movement of the blocking lever into blocking position when the shaft turns in reverse direction.

2. A loom according to claim 1, in which the blocking lever is mounted on said shaft and is normally in unblocking position and said drive means includes an overrunning clutch effective for driving the blocking lever in only the reverse direction of said shaft.

3. A loom according to claim 2, in which said overrunning clutch comprises an element drivingly connected to said shaft and an element drivingly connected to said blocking lever, and friction means interposed between one of said shaft and blocking lever and the pertaining element to permit continued reverse rotation of said shaft after said blocking lever is moved to blocking position.

4. A loom according to claim 3, in which said drive lever comprises pin means projecting therefrom and said blocking lever has a notched angular nose portion which engages said pin when said blocking lever is in blocking position and said drive lever is in its said first position to hold said printing grid in said first position.

5. A loom accordng to claim 4, in which said pin is a roller pin.

6. A loom according to claim 1, in which said drive lever comprises a roller engaging said cam.

7. A loom according to claim 2, in which said blocking lever comprises a support roller near the said drive lever, and a shoulder on said drive lever extending substantially in the direction of movement of the portion of the drive lever on which the shoulder is formed, said shoulder being disposed to engage said support roller and support said blocking lever in unblocking position when said shaft rotates in forward direction, said shoulder permitting free pivotal movement of said drive lever under the influence of said cam while supporting said blocking lever so that a short movement of the blocking lever from its supported position will move it into blocking position when the said shaft moves in reverse direction.

References Cited UNITED STATES PATENTS 3,096,792 7/ 1963 Strach 139-59 3,356,109 12/1967 Neyraud 13959 X FOREIGN PATENTS 571,648 10/1958 Belgium. 1,039,530 5/1953 France.

593,098 10/ 1947 Great Britain.

733,960 7/1955 Great Britain.

755,184 8/ 1956 Great Britain.

789,852 1/ 1958 Great Britain.

JAMES KEE CHI, Primary Examiner.

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