JPS5831908Y2 - Pile length adjustment device for towel loom - Google Patents

Description

[Detailed description of the invention] This invention relates to a pile length adjustment device for a towel loom.In particular, by separating the locking operation of the draw lever and the associated loose/fast pick selection operation, the invention eliminates noise, vibration, etc.
This is designed to reduce parts damage.

In towel looms, during so-called loose picks, the reed is moved back from its normal position to perform weft beating, and during fast picks, the reed is moved forward to its normal position to perform weft beating.
The pile is being woven.

The increase or decrease in the pile length is determined by the retreating distance of the reed, that is, the amount of relief.

Conventionally, the pile length adjustment device described above uses a terry cam to lock a draw lever operatively connected to the race at a predetermined cycle and timing, and this locking causes the race to tilt backward as the sled sword moves forward. There is a known method in which the reed is let go and the reed is released.

To explain this type of device in more detail, a race is swingably installed on a fixed support shaft on the machine base, and this race is operatively connected to the front end of the draw lever via an intermediate link mechanism such as a toggle lever, and is fixed. A draw pin is placed near the rear end of the draw lever, and the rear end of the draw lever is operatively connected to the tenor cam via an intermediate link mechanism.

In terms of operation, during a loose pick, the draw lever is locked by the draw pin due to the action of the cam, and as the sled sword moves forward, it receives resistance and does not follow it.

As a result, a corresponding movement occurs in the intermediate link mechanism connecting the draw lever and the race, and the race swings backward about the support shaft, and the reed moves backward, that is, escapes.

During a fast pick, the draw lever is similarly released from the lock by the drawbin due to the action of the cam, and the sleigh sword follows this movement without any resistance as it moves forward.

As a result, no movement occurs in the intermediate link mechanism connecting the draw lever and the race, so the race does not tilt backward and the reed does not move backward.

By the way, in the above-mentioned type, the timing at which the draw lever is locked coincides with the timing at which the reed release starts.

As a result, all the parts related to the reed release move at the same time as the draw lever locks, which causes a large load to be applied to the area around the draw lever at once, causing the entire device to shake violently and make a loud noise. This has the drawback that not only does it cause damage, but also that each part is more likely to be damaged by impact, which is disadvantageous from both the occupational environment and hygiene standpoint as well as from the standpoint of maintenance management.

In view of this current situation, this invention shifts the locking timing of the draw lever and the timing of starting reed release, thereby separating the locking operation of the draw lever and the accompanying loose/fast pick selection operation. The purpose is to disperse the impact.

That is, in this invention, a cam for reed release is formed at the upper end of a cam lever swingably mounted on a locking shaft, and a cam ball attached to the sled sword and operatively connected to the race via an intermediate link mechanism is attached to this cam. The draw lever is placed in elastic pressure contact with the reed release cam, and the front end of the draw lever is pin-coupled to the rear end of the cam.

Here, the cam surface of the reed release cam does not cause any movement in the intermediate link mechanism connecting the race and the cam ball in a certain section at the beginning as the sled sword moves forward, and the sled sword further moves beyond the above section. When moving forward, the intermediate link mechanism is designed to move.

During a loose pick, the draw lever is locked by the draw pin due to the action of the terry cam, and as the sleigh sword moves forward, it receives resistance and does not follow this.

Therefore, the cam lever swings backward and the flow cam is locked.

On the other hand, the cam ball moves forward as the sled sword moves forward and comes into rolling contact with the arcuate surface of the cam.At a certain timing, it is acted upon by the rising surface of the cam, and the intermediate link mechanism moves accordingly, causing the race to move. The reed swings backward about the support shaft, and the reed retreats, that is, escapes.

During fast pick, the draw lever is similarly released from the draw pin lock by the action of the terry cam, and when the sled sword moves forward, it follows this without any resistance.

Therefore, the cam lever moves forward together with the sleigh sword without swinging.

That is, even when the cam ball moves forward, its positional relationship with the cam does not change, so no movement occurs in the intermediate link mechanism connecting the cam ball and the race, so the race does not swing and the reed does not escape.

The present invention will be described in more detail below with reference to embodiments shown in the accompanying drawings.

In this specification, the side on which the front of the loom is located is referred to as the front, and the side on which the warp beam is located is referred to as the rear.

Furthermore, the heads of the pins used in the various parts described below are often screwed with nuts to prevent them from being pulled out, but these are omitted in the diagram for the sake of simplicity, unless it is particularly necessary. This is an indication.

FIG. 1 shows an outline of the overall structure of the pile length adjusting device.

This device is attached to the sides of the left and right sled swords S, but since there is essentially no difference in configuration and function between the left and right sides, only the device installed on the left sled sword S will be described.

That is, in the figure, the left side is the front. As shown in detail in Figures 1 and 2, a reed R is installed on the upper surface of the race L whose lower end is loosely supported on the support shaft 1, and a first toggle lever is installed at the rear end of the race L. The front end of 3 is pin-coupled A.

A pin 5 is fixed to the rear end of the torque braker 3 so as to protrude laterally, and the front end of a second toggle lever 4, which faces downward and has a substantially triangular shape, is pin-coupled to the pin 5.

Furthermore, the upper end of the rod 11 is pin-coupled C to the lower end of the second toggle lever 4, and the upper end of the first tension spring 9 is locked to the rear end.

A draw lever racket 13 is fixed to the side surface near the lower end of the sled sword S.
An adjustment lever 1 is attached to a pin 15 protruding from the side.
7 is loosely supported at a position near the front end.

The lower end of the rod 11 described above is fixed to an adjustment elongated hole 16 formed through the body of the adjustment lever 17 so as to be able to change its mounting position.

Note that the elongated hole 16 is preferably formed into an arc centered on the pin connection point C so that the lever 17 does not move even if the mounting position of the rod 11 is changed.

Further, the lower end of the first tension spring 9 is locked to the rear end of the adjustment lever 17.

A ball lever 20 is supported on the pin 15 at a position inside the adjustment lever 17, and a cam ball 21 is rotatably supported at the front end of the ball lever 20.

As is clear from Fig. 3, the adjustment lever 17
The front end of the ball lever 20 projects above the ball lever 20, and a stopper 22 provided on this projecting part has its tip abutted against the upper surface of the ball lever 20.

Therefore, when the ball lever 20 rotates clockwise about the pin 15, the adjustment lever 17 is also pushed up via the stopper 22 and rotates around the pin 15 in the same direction.

Note that the upper end of the second tension spring 23 is locked to the rear end of the bracket 13.

A cam lever 27 extending upward is loosely fitted at the lower end of the locking shaft 25 that pivotally supports the sleigh sword S, and this cam lever 27 has a cam shaped like an inverted triangle and having a cam surface on the upper surface. It has 27 a.

Note that the lower end of the second tension spring 23 is locked to the rear protrusion 27b at the lower end of the cam lever 27.

Normally, the front surface of the cam lever 27 is urged by this spring force so as to come into pressure contact with the stopper 28 on the sleigh sword S, and is in the position shown by the chain line in the figure.

In this state, the cam lever 27 swings in accordance with the swing of the sled sword S.

At least a portion of the cam surface of the cam 27 a near the draw lever 29 is formed by a circular arc surface centered on the axis of the locking shaft 25, and the remaining portion rises upward from this. Formed by a surface.

The front end of a draw lever 29 is pin-coupled to the rear end of the cam 27a, and a draw hook 29a is formed at the rear end of the draw lever 29.

Further, a terry cam 33 is fixed to a rotating shaft 31 installed horizontally at the rear and lower part of the cam lever 27.
3 has a cam peripheral surface of high and low height to complete one cycle for a predetermined number of loom picks.

An arm 36 extending rearward is loosely fitted into a fixed rotation shaft 35 arranged in parallel with the rotation shaft 31, and a cam ball 37 rotatably supported at the rear end of this arm 35 is driven by a spring biasing mechanism (not shown). Due to its action, it is in rough contact with the circumferential surface of the Terry cam 33.

Furthermore, an arm 39 is loosely fitted onto the fixed shaft 35 and extends rearward and is integrally connected to the arm 36 described above.

A horizontal main shaft 41 is provided below the draw hook 29a across the machine base, and a draw pin 45 is installed horizontally at the end of an arm 43 fixed to the main shaft 41.

In the illustrated state, this draw pin 45 is attached to the draw hook 29.
It is covalently captured at a.

A switch lever 47 that extends back and forth is loosely fitted into the main shaft 41 at approximately the center thereof, and its front end is connected to the link 4.
9 to the rear end of the arm 39, and the rear end contacts the bottom of the draw hook 29a through a ball 51.

In addition, from the Terry cam 33 to the draw pin 45 and the ball 5
Each mechanism up to 1 is arranged at the front lower side of the back cross rail BCR.

(I) Now, in the above structure, each part operates as follows when the fast pick timing comes.

Around the timing when the sleigh sword S is the most backward (the timing when the liquid also reaches the right position in the figure), the cam ball 37 comes into contact with the high part of the terry cam 33, and the arm 36
, 39 are both pushed down and swung clockwise, and the link 4
9, the switch lever 47 swings counterclockwise about the main shaft 41.

As a result, the draw hook 29a is pushed up via the ball 51, and the engagement between the draw hook 29 and the draw pin 45 is released.

Therefore, the cam lever 27 is no longer restrained via the draw lever 29, and as a result, the cam lever 27 is placed in the position shown by the chain line in the figure by the action of the spring 23, and comes into contact with the stopper 1 to the collar 28, and the cam ball 21 is moved to the cam. 27a near the draw lever (the arcuate surface centered on the axis of the locking shaft 25).

When the sled sword S moves forward (swings to the left in the figure), the cam lever 27 also maintains the above state and moves forward together with the sled sword S.

During this time, the draw lever 29 also moves forward together, but since it has already been disengaged from the draw pin 45, there is no resistance to prevent this movement.

Therefore, at the timing when the sled sword S moves forward the most, the reed R performs fast pick at the position shown by the chain line in the figure.

(II) When the loose pick timing comes, each part operates as follows.

When the sleigh sword S is moved back the most, the cam ball 37 comes into contact with the lower part of the terry cam 33, and the arm 36.
39 both swing counterclockwise, and the switch lever 47 rotates clockwise around the support shaft 41 via the link 49. Therefore, the position of the ball 51 is lowered and the draw hook 29
a engages with the draw pin 45 and captures it.

Even if the sled sword S starts moving forward in this state, the cam lever 27, which is locked to the draw pin 45 via the draw lever 29, cannot follow this movement, so it maintains the posture shown by the solid line in the figure.

On the other hand, since the ball lever 20, which is locked to the sled sword S via the bracket 13, moves forward as the sled sword S moves forward, the cam ball 21 moves forward on the cam surface.
Eventually, the ball lever 20 reaches its rising surface and is pushed upward, and accordingly, the ball lever 20 is also gradually pushed up and rotated clockwise about the pin 15.

This rotation causes the integral adjustment lever 17 to swing in the same direction.

That is, the rod 11 is pulled down, and the race L swings clockwise around the support shaft 1 via the toggle levers 3 and 4.
At the timing when the sled sword S moves forward the most, the reed R performs a loose pick at the position shown by the solid line in the figure.

That is, when the reed R is loosely picked, its weft striking position is moved back by a distance FD (usually referred to as the missed amount) than when it is fast picked.

The size of this relief amount FD is determined by the elongated hole 1 at the lower end of the rod 11.
It can be freely adjusted by changing the mounting position relative to 6.

The amount of relief increases as the mounting position of the rod 11 approaches the rear end of the elongated hole 16.

Therefore, the attachment of the lower end of the rod 11 can be adjusted back and forth depending on the pile length that the towel to be woven should have.

By the way, in the case of the device of this invention, the draw lever 29 and the draw pin 45 are engaged at the timing when the sled sword S is at its most retracted position, but the pushing up of the cam ball 21 (i.e., the release of the reed R) is done after the sleigh sword S moves to a certain extent from there. The process starts after the cam ball 21 moves forward and reaches the rising surface of the cam 27a.

That is, the lock timing of the draw lever precedes the start timing of reed release.

Therefore, it is the cam lever 2 that moves (relatively) when locking.
7 and no other parts are moved, so only the elastic force of the second tension spring 23 and the inertial force of the cam lever 27 are applied to the draw pin 45, and the impact applied to the draw pin 45 is also alleviated.

In addition, since the above-mentioned locking is performed near the most retracted position where the speed of the sled becomes extremely small, the impact is further alleviated.

Then, at a subsequent timing, when the cam ball is pushed up, a large load will be applied to the area around the draw lever, but this load is borne by the locking shaft 25 and not applied to the draw pin 45, so there is no problem.

Furthermore, even though the parts move, as far as the cam lever 27 is concerned, the cam ball 21 simply rolls on the upper surface of the cam 27a, so no impact is applied to the locking shaft 25.

The timing to start pushing up the cam ball can be freely selected by changing the design of the cam surface.

In addition, since the reed is gradually reversed as the cam moves forward, the motion is gentle, so damage to parts, vibrations, and noise can be avoided. It can be effectively avoided.

To give an example of a practical design, when performing a loose pick, the draw lever is locked at around a crank angle of 210°, the ball lever starts to swing around 250° (in other words, the reed release begins), and the ball lever starts to swing at around 250°, and the ball lever starts to swing at around 250°, and at 330°. Make sure that the reed escape is completed in the vicinity.

In this case, the cam surface has a crank angle of 210 to 250°.
The section corresponding to 250 DEG to 330 DEG may be formed of a circular arc surface centered on the axis of the rocking shaft, and the section corresponding to 250 DEG to 330 DEG may be made of the above-mentioned rising surface.

[Brief explanation of drawings]

FIG. 1: A partially sectional side view showing one embodiment of this invention. FIG. 2: A perspective view showing the area around the lace. FIG. 3; A plan view showing the surroundings of the cam mechanism. S...Slay sword, L...Lace,
R...Reed, 3,4...Toggle lever,
5, 15... Pin, 22, 28... Stopper, 9, 23... Tension spring, A, C...
...Pin connection point, 11...Rod, 13.
...Draw lever bracket, 17...
Adjustment lever, 20...Pole lever, 2
1, 37...Cam ball, 25...Rocking shaft, 27...Cam lever, 27a...
...Cam, 29...Draw lever, 29a
...Draw hook, 31...Rotation axis,
33...Terry cam, 41...Main shaft,
45...Draw pin, 47...Switch lever

Claims (5)

[Scope of utility model registration request] (1) Due to the action of the terry cam, the draw lever 29 engages with the draw pin at a fixed position at a predetermined cycle and timing, and as the sled sword S moves forward, the movement corresponds to the intermediate mechanism that connects the draw lever and the race L. The cam lever 2 is swingably installed on the locking shaft 25, and the cam lever 2 is of a type that performs loose picks by raising the
A reed relief cam 27a is formed at the upper end of the reed retraction cam 27a, and this cam has a forward rising surface, and the front end of the draw lever is pin-coupled to the rear end of the reed retraction cam 27a. A cam ball 21 operatively connected to the race via an intermediate link mechanism is mounted on the sled sword by being elastically pressed against the reed release cam surface, and when the draw lever engages with the draw pin. Only in this case, as the sled sword moves forward, the cam ball moves relative to the cam and moves on the rising surface of the cam, and accordingly, the race swings backward to perform the reed release. Pile length adjustment device for towel looms. (2) The device according to claim 1, wherein the section of the rising surface of the cam is 250 to 330 degrees in terms of crank angle. (3) An adjustment lever 17 is loosely supported on the pin 15 which is in a fixed relationship with the sleigh sword, and the rear end of this adjustment lever is operatively connected to the race via a group of intermediate link members, and is connected to the above-mentioned pin. The device according to claim 1, wherein the cam ball 21 is rotatably supported at the end of a ball lever 20 which is integrally supported with an adjustment lever in a loose fit. (4) The device according to claim (1) of the utility model registration claim, characterized in that the portion on the rear side of the cam rising surface is constituted by an arcuate surface centered on the axis of the locking shaft 25. . (5) The section of the circular arc surface of the cam is 21 in terms of crank angle.
The apparatus according to claim (4) of the utility model registration, characterized in that the angle is 0 to 250 degrees.