JPS5887346A - Changeable draw mechanism for straight bar type knitting machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a variable draw (
This invention relates to a knitting machine equipped with such a mechanism. The invention particularly relates to British Patent Specification No. 201
It can be applied to high speed straight knitting machines of the type described in No. 5039.

Variable draw mechanisms are well known. When extending or shortening the stroke of the traversing motion by changing the drive mode of the variable 10 mechanism to adapt to changes in knitting width, the camshaft is adjusted to maintain the maximum possible linear speed of the yarn carrier. rotation speed is changed. This increases the productivity of the knitting work and maintains the high quality of the knitted product.

The variable draw mechanism described in U.S. Pat. No. 2,872,798 uses a conventional friction box in which the travel of the n1' lower cam is transmitted at a variable rate to the slurry cock and drag box. The end stop is displaced so that the yarn carrier is stopped at the desired stage of the draw (yarn retraction operation) and leads the slurry cock again during the next traversing movement of the stopped carrier. Make it move.

British Patent No. 2,015,039 describes a variable draw mechanism that does not use a friction box and actively drives both the carrier and slurry cock via a differential drive mechanism. In that patent, a cruciform cam is provided to vary the timing of the differential and drive to ensure proper lead of the carrier to the slurry cock during each traverse motion. However, such a configuration is expensive to manufacture and has high maintenance costs.

It is an object of the present invention to provide a reliable variable draw mechanism in which the carrier and slurcock are positively driven via a differential.

The present invention relates to a straight par type knitting machine equipped with a variable draw mechanism for moving a slurcock and a yarn carrier back and forth. a first manpower member for supplying human power; means for changing the transmission ratio of the draw cam follower to the first manpower member in order to change the draw width; and a second manpower member for supplying the gear device. The second manpower member and the gear device include a differential device for assembling the first manpower and the second manpower in order to differentially move the slurry cock and the Yankiyaya, and in which direction. a control means for controlling the second manual member so that the yarn carrier fully leads the slurry cock even in the draw motion;
a cam mounting member movable integrally with the input member; a lead control cam means mounted on the cam mounting member and movable as a whole therewith; and the lead control cam means y;
means for individually moving the low cam follower relative to said cam mounting member in synchronization with the transmission ratio between said low cam follower and said first human power member; a lead control cam follower coupled to the second manpower member to slow the carrier travel speed and set a desired carrier lead for a subsequent draw movement at a different draw width; To provide a knitting machine characterized by the following. The lead control cam has a constant travel and is used to set the lead reversal and desired carrier deceleration at the end of the traverse motion at widely different draw widths. can do. The constant travel cam is actuated by the varied movement of the first differential input member in a manner that imparts the desired movement to the second differential input member. This variable draw mechanism can be robustly constructed to allow high speed operation for long periods of time and is highly reliable.

Preferably, the first differential input member is pivotable and includes a first sector gear for driving engagement with a gear of the differential. The first human power member can be coupled to a second sector gear that drivingly engages the rack to linearly move the lead control cam mounting member. Such differential operation allows the differential and reed control cam to change speed without distortion, thereby allowing precise synchronization of slurry cock and yarn carrier motion.

The follower for following the draw cam is preferably pendulum controlled and linked to a block attached to a screw attached to A-. This screw is rotated in proportion to the required draw width. The block is slidably carried within a slot formed in a member carried by a pair of parallel arms. The first differential input member is a lever that is pivotable integrally with the parallel arm. The screw screwed onto the pendulum control lever is 1
The end stop of the carrier can be rotated proportionally to the screw displacing the end stop for a variable range of 0-width. There is no need to compensate for the non-linear response of the first differential input member to changes in the position of the end stop by a separate mechanism.

Preferably, the lead control cam mounting member includes a pair of screws and a cam block attached to each screw, the pair of screws being turned together to move the cam blocks in opposite directions. Make it. The pair of screws are drivingly connected to the splined shaft. When this splined shaft is rotated together with a screw mounted on the pendulum control lever, the pair of cam blocks are correspondingly displaced linearly relative to each other. The cam follower makes one rocking motion at the end of each traverse motion. The cam follower is
A pair of arms are provided for engaging each of said cam blocks, and switching means are provided for associating a corresponding arm with a corresponding cam boot block at the end of each traverse motion. This switching means is a means for displacing the cam follower in the axial direction, and is actuated by a cam that is movable together with the draw cam. The screws, cam block and switching means pivot the cam follower at the end of each traversing motion and ensure that the cam follower is held in position by a linear cam trajectory until the switching means is next actuated. so that it is maintained.

Explaining mainly with reference to FIGS. 1 to 3, 10-cam 2 (yarn drawing cam 'J Ifi) is rotated by a half-speed shaft so that it rotates once every two revolutions of the main cam shaft. Each revolution of the shaft performs a knitting cycle and a draw (yarn drawing) cycle.The follower mechanism of the draw cam is mounted on mounting members 6, 6 interconnected by rods 8 and extends diametrically across the cam 2. A pair of rollers 4, 4 are provided on opposite sides.

A set of rods is provided on each side of the cam 2.

This cam follower mechanism is supported on one side by a pendulum lever 10 and on the other side by an upright lever 12. Lenos 10 and 12 are both mounted on the side tables of a straight par knitting machine. The cam follower mechanism is connected to the vertical slot 1 of the A-shaped member 20.
A substantially horizontal link 14 to a block 16 mounted within 8
connected by. Lever 1o4ma1. It has two interconnected members extending across the A-shaped member 2o, and the rear member of the two members is connected to the link 14.

The ratio of motion transferred from the cam follower mechanism to the A-shaped member 20 is determined by the position of the block 16 within the slot 18. The position of the block 16 within the slot 18 can be controlled by moving the block 16 up and down by turning a screw 22 attached to a pendulum lever 24 attached to the end stand of the knitting machine. . The A-shaped member 20 is supported by two parallel bowls 26,28. One arm 28 is connected to a quadrant gear 30 by a pin 29 and is pivotable about the same axis 29 as the quadrant gear 30. Quadrant tooth profile 3
0 is therefore moved integrally with arm 28. Quadrant gear teeth 32 communicate a first differential input to a gear mechanism including a differential 34 of the configuration described in British Patent No. 2,015,039%.

This first human power is directly connected to the slurry cock drive mechanism and changes the range of motion of the slurry cock in accordance with the rotation of the screw 22 (see FIG. 10).

Referring specifically to FIGS. 2 and 3, a sector gear 40 is attached to the lower end of the arm 28 and meshes with a toothing 42 engaged with a rack 44. rack 4
4 slides linearly back and forth with the same differential rate transmitted to the slurry cock via the differential 34.

Rack 44 carries a cam mounting member 46 that is slidably mounted on guide rails 51.53 (FIG. 3). The cam mounting member 46 rotatably supports a pair of screws 60, 62. Each screw is also included. Upper track par 48 and lower track nozzle 50, and cam block 52.54'
I support it.

Cam blocks 52 and 54 have oppositely sloped constant travel lead control cam surfaces 56,58 (FIG. 3). The cam surfaces 56,58 form an inclined surface.

The cam blocks 52, 54 have respective track holes 48
, 50, the sliding movement is guided by the rails 51.53 and is held against rotation. screw 60.62
is turned by rod 64 so that it rotates simultaneously and by the same amount as screw 22. The rod 64 and the screw 22 are driven in synchronization with the selvage screw 121 attached to the knitting machine (FIG. 4). The screw 121 moves the end stop to impinge on the carrier at the end of the traverse movement of the carrier. A chain 120 or the like (FIGS. 4-9) may be used to transfer motion from selvage screw 121 to rod 64 and screw 22.

The screws 60 and 62 are connected to a gear 122 (11th
) and operate in opposite directions. Thus, as the draw width (yarn pull width) is increased or decreased, the lead control cam surfaces 56 and 58.

They are moved linearly in opposite directions. The linear movement stroke of the cam mounting member 46 from the time the cam follows until the cam 6- engages the respective cam surface changes in proportion to the draw width.

The IJ-F control cam followers are in the form of levers 72 for engaging cam surfaces 56 and 58. Leno and others
72 are two rollers 68 oriented in opposite directions
．． 70 and an output arm 66 connected to the differential gear 173 to provide a second differential input to the differential 34. The reno gear 72 is pivotally mounted on a biget shaft 74. Leno 2-66 for axially displacing the lever 66 along the axis 74 to position the appropriate follower or roller 68 and 70 within the path of travel of the corresponding cam surface 56 or 58.
A threaded member 76 is provided which engages with. Screw member 7
6 is actuated by a bell crank lever 80 following a rotor l'78 and a conjugate cam B2 on the half-speed shaft. Thus, the leno yarn 72 is forced into the 9 position at the end of each 10-(yarn retraction) operation when the slurcock is at rest and the knitting operation is in progress.

In the modified construction shown in FIGS. 4-10, the quadrant gear 30 is actuated by a variable ratio transmission mechanism similar to that previously described, but with a pendulum gear for structural convenience. 2
4 is placed on the opposite side.

The quadrant gear operates a gear mechanism that includes differential #34;
The slurry cock and carrier are operated as in the embodiment of FIGS. 1-3. The quadrant gear 30 also includes a sector gear 40 for reciprocating the cam mounting member 46. The main difference is that the 1j-1 control force follower 72 is
The cam follower and the side stand 2 of the knitting machine are controlled by the swinging cam 102.
It is configured to be moved in the axial direction via the rod 103 extending through it, thereby simplifying the mechanism for controlling the axial movement of the follower 72.

Screws 60 and 62 are turned in opposite directions by a splined shaft 63 connected to rod 64 by a bevel gear.

A series of sequential operations for controlling the draw motion will now be described with reference to FIGS. 4-9. Figures 4-6 are.

The sequential stages of the wide draw movement are shown. Figures 7-9 show the successive stages of the narrow draw movement. In the case of a wide draw movement, the screw 22 and the screw 60.62 are turned simultaneously together with the screw 121 attaching the end stop 104 for the yarn carrier 116. This operation is performed by chain 1
20 and a rotating shaft 124 having a gear 126 meshing with a gear on a screw 121 (FIG. 10), end stop 104, block 16, and block 52% 54.
is moved so that it occupies a distance t suitable for wide draw motion. That is, the block 16 is inserted into the slot 1 by the screw 22.
It is placed in a low position within 8. The rear block 54 is spaced to the left of the front block 56 by screws 60,62.

At the start of the draw (yarn retraction) cycle (fourth
), quadrant gear 30 is pivoted to rotate gear 108 (FIG. 10) of differential @110. The gear 108 is connected to a slurry cock 116 by a shaft 112 and a belt 114.
is directly connected to. Cam followers for lead control
72 rollers 68 are connected to the upper track par 48 and the lower track A-
50, and is held in that position by the action of the cam 102 and rod 103. What is the angular position of lever 72?

transmitted by the Rondore 3 and controls the binion carrier 115 of the differential 110 to hold it in place, thereby causing the yarn carrier to6t to move in the same direction and at the same speed as the slurry cock 116 by means of the belt/sleeve transmission mechanism.
And some "lead" (preceding) against slurcock
(Figure 10). As the quadrant gear 30 continues to swing (pivot) further, the sector gear 40 moves the cam mounting member 46, thereby causing the reno-72 to move.
The track holes 48, 50 are slid against the rollers 68 without moving the rollers 68. In Figures 4-6, a portion of track/6-48.50 has been cut away to show the parts behind it.

Next (FIG. 5), the carrier 106 is moved to the end stop 104.
, the cam surface 56 approaches the roller 68. Just as the carrier 106 hits the end stop 104, the roller 68 and cam surface 56 cause the lever 72 to swing. As a result, the binion carrier 115 is pivoted, stopping the motion of the gear 108 that propels the slurry cock 116. When the roller 68 climbs up the cam surface 56, the slurry cock 116 has overtaken the yarn carrier 106, which is pressed against the stop 116. Camming surface 56 thus decelerates carrier 106 when carrier 106 impinges stop 104 and positions the carrier in the correct position for selvage formation. It also ensures that the carrier 106 moves ahead of the slurry cock 116 again during the next traverse movement. During the above-mentioned movement, the lever 72 assumes the attitude shown in FIG. 11 with respect to the cam mounting member 46.

As roller 68 is raised, roller 70 is lowered between another track par.

The draw cycle ends at this stage. The knitting cycle occurs while the quadrant gear 30 is stationary and the carrier 106 and slurcock 116 are stationary.

The swing cam 102 operates the rod 103, and the Leno? -7
2*Displace along its bisette axis. the result,
The rollers 70 connect the upper track holes 48 and the lower track holes 50.
and the roller 68 is moved out of the path of the parts forming the cam surface 56, as shown in FIG.

FIG. 6 shows one stage of the reverse draw movement following the end of the knitting cycle. At the end of this draw movement, the rearmost cam surface 58 moves and ? -72 is swung,
The differential 34 is moved to the fourth position, which is the ready position for repeating the cycle.
Return to the position shown in the figure.

For narrow draw movements, screws 22 and 60.
62 are simultaneously rotated together with the end stop 104, the block 16 is placed in a higher position, and the rear cam block 54 is displaced in a direction closer to the front cam block 52. As a result, the time that Reno-72 is held stationary by orbits ζ-48 and 50 gradually becomes shorter. 7th to 9th
The figure shows successive stages of a very narrow draw motion in which the differential 110 serves to slow the movement of the yarn carrier 106 during substantially the entire stroke of the draw motion. Of course, the draw width can be changed during the knitting of the garment, but Figures 4-6 and 7-9 show extreme positions.

In FIG. 7, the quadrant gear 30 is at its midpoint as it oscillates clockwise due to the narrow draw motion. At this stage the lever 72 is swung by the cam surface 56 acting on the roller 68. Roller 70 is lowered. Yarn carrier 106 is thus decelerated during most of the draw cycle.

In FIG. 8, the quadrant gear 3o has reached the end of its oscillation and the roller 68 has been fully pushed up. Slurcock 116 is now ahead of carrier 106 and has regained the lead. As can be seen, the roller 7o is in a ready position to be pushed up by the cam surface once the lever 72 is displaced axially during the next knitting cycle.

In the next draw cycle, the slurry cock 116 makes a traverse movement, but the carrier 106 is stopped from the very beginning by the swinging of the lever 72. Thus,
The slurcock catches up with the carrier 106 pressed against the end stop 104 and then overtakes the carrier to recover the lead for the next traverse motion. The final position in which roller 7o is pushed up by cam surface 58 is shown in FIG.

As you can see from the above explanation, even if the draw width is narrowed,
The cam surfaces 56,58 are repositioned on the cam mounting member so that they still engage the follower lenos 72 at the end of the pinched draw motion.

This operation is reliable and can be achieved by a simple cam geometry.

The overall arrangement is such that the yarn carrier is decelerated early in the case of narrow draw movements.

This is done in synchronization with the slowing down of the slurcock that will immediately follow.

By doing so, the deceleration operation is spread over a larger arc of rotation of the camshaft. Because roller 68.
70 because the movement obtained from the movement of the quadrant gear 30 reduced in speed in the transmission mechanism must be used to climb the inclined surface of the cam. Thus, even if high camshaft rotational speeds are used for narrow draw motions,
The required carrier deceleration characteristics can be maintained so that the linear velocity of the carrier remains constant.

[Brief explanation of the drawing]

FIG. 1 is a side view of the main parts of a variable draw mechanism according to the present invention for supplying a first differential input, and FIG. 2 is a side view of the main parts of a variable draw mechanism according to the present invention for supplying a second differential input. FIG. 3 is a cross-sectional view of the parts shown in FIG. 2, FIG. 4 is a side view of the main components of the variable draw mechanism according to a modified embodiment of the present invention, and FIGS. 5 to 9 show the draw mechanism. Fig. 1θ is a front view of a portion of the straight nomer type knitting machine equipped with the draw mechanism shown in Figs. 1 4 to 9, and Figs. FIG. 6 is a diagram showing the position of the lead control cam follower shown in the figure. In the figure, 2 is a draw cam, 4 is a roller (cam follower), 6 is a cam mounting member, 16 is a block, 18 is a slot, 20
is the A-shaped member, 22 is the screw, 24 is the pendulum Leno ζ-126
, 28 is an arm, 30 is a quadrant gear, 32 is a gear tooth, 34 is a differential gear, 40 is a sector gear, 44 is a rack, 46 is a cam mounting member, 48.50 is a track hole, 151, 53 are Rail, 52.54 is a cam block, 56.58 is a lead control cam surface, 60.62 is a screw, 68.70 is a roller, 72 is a lever (lead control cam follower), 76 is a screw member, 82 is a cam . Patent applicant: 2 persons other than William Codon Limited Procedural amendment (method) December 1997 218 Patent Office Commissioner Kazuo Wakasugi 1, Indication of the case, 1981 Patent m No. 140015 3, Amendment Relationship with the case filed by the applicant: Address of applicant: Name: William Codon Limited 6,
Number of inventions increased by amendment [2] Complete drawings (engraved, no changes in content) 8 Supplementary HHo
Part 6: Attached page

Claims (1)

Claims: 1) Variable with cam means for controlling the lead of the yarn carrier to the slurry cock caused by the difference in the draw movement in each direction and the difference in the range of the draw movement provided by the variable ratio transmission mechanism. In a straight par knitting machine equipped with a draw mechanism, a cam mounting member (46) to which a pair of lead control cams (56, 58) are attached is provided, and the cam mounting member is connected to a draw cam follower (4, 6). The cam (56, 58
) The entire assembly is configured to be able to be moved together with the cam mounting member by an amount corresponding to the range of the draw motion, and the differential f (34) is operated to slow down the moving speed of the yarn carrier. relative to said cam mounting member such that said cam (56, 58) engages a lead control cam follower (72)' at the end of a draw movement to set the desired carrier lead at different draw widths; A knitting machine characterized in that it is provided with means (60, 62) for individual movement. 2) The cam mounting member (46) is a rail (51, 53)
The rack is supported so that it can slide linearly by
A draw lever (30) is provided with a sector gear tooth (40) connected to the differential gear (34) and is connected to the differential gear (34). 32)) A knitting machine according to claim 1. 3) The cam mounting member (46) is attached to the cam block (52).
and 54), a pair of rotatable screws (60,
3. A knitting machine according to claim 1, wherein the cams (56.degree. 58) are arranged to move the cam blocks in opposite directions. 4) to allow sliding movement of the cam mounting member (46) while maintaining rotational control of the screw (60% 62);
The splined shaft assembly (59) is connected to the variable transmission ratio transmission mechanism (16, 18, 20, 22, 24, 26, 28, 30
4. A knitting machine according to claim 3, wherein the knitting machine is drivingly connected to a control screw (22) for rotation therewith. 5) The control screw (22) is a lever! The draw cam follower (4) is attached to the draw cam follower (4) via the link (14).
, 6'), the block (16) changing the range of draw movement in proportion to the amount moved by the screw (22). A pair of parallel arms (26,
A slot (28) formed in the member (20) supported by
5. A knitting machine as claimed in claim 4, in which the knitting machine is drivingly engaged within the knitting machine 18'). 6) The lead control cam follower (72) is connected to the cam (56,5).
8) along the axis (74) of the cam follower to engage the cam follower (72) with a selected one of the cams (56, 58). The knitting machine according to any one of claims 1 to 5, further comprising a cam (82) for operating the moving mechanism (76).7) The cam follower (72) is Each corresponding cam (
a pair of rollers (68 or 58) for engaging rollers (56 or 58);
, 70) and are provided with linear tracks (48, 50) for restraining said rollers (68, 70) so that a proper carrier lead is maintained during the draw movement. A knitting machine according to item 6 within the scope of