JPS6236874Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heald frame hanging device for a loom.

A heald frame hanging device is known in which a hanging rope connected to a heald frame is hooked to one side of a swingable jack lever, and a spring is hooked to the other side. This type of heald frame hanging device was developed in the 1970s.
It is disclosed in No. 38617 and Japanese Unexamined Patent Publication No. 53-90470. In other words, this type of heald frame hanging device takes into consideration the effects of the heald frame's own weight and the warp tension, so that the spring tension acting on the heald frame is always constant during the shedding movement of the heald frame, or The spring tension tends to decrease slightly when the heald frame is lowered due to movement.

On the other hand, in a loom that uses selvedges for weaving, a heald frame for selvedge warps is separately provided in order to form selvedges made of several warp threads on both ends or one side of the woven fabric. In conventional heald frame hanging devices, jack levers of the same shape and springs of the same performance are used for the heald frame for the selvedge warp and the heald frame for the ground warp.
The spring latching point on the jacket lever connected to the heald frame for the ground warp is provided at the same position as the spring latching point on the jacket lever connected to the heald frame for the ground warp. The spring tension acting on the jack lever is set to pull up the ground warp heald frame on which a large number of ground warp threads are hung, and to press the cam follower connected to the heddle frame against the cam. In other words, the sum of the spring tension and the force generated by a large number of ground warp yarns to pull up the heald frame upward against the downward inertial force of the heald frame that occurs when the heald frame descends is the The spring tension is set to press the cam follower against the frame drive cam. However, the number of warp threads that can be hung on the heald frame for the selvedge warp is small, so when the heald frame is lowered, the force that tries to pull up the heald frame for the selvedge warp by the selvedge warp is used to pull up the heald frame for the ground warp. It is smaller than the force you try to use. Therefore, when weaving is carried out using a conventional heald frame hanging device, when the heald frame is lowered, the downward inertial force of the heald frame for the heddle warp tends to pull the heald frame upward for the heald warp. The cam follower connected to the heald frame may overcome the spring tension and separate from the cam for driving the heald frame for discarded warps. Therefore, the shedding movement of the heald frame for the selvedge warp yarns does not follow the movement of the driving cam. This tendency increases as the operating speed of the loom increases.

In particular, in air jet looms, etc., in order to have the function of reliably capturing the ends of the weft threads that are inserted into the waste selvage, the opening time of the waste selvedge warp threads is constructed to be slightly earlier than the opening time of the ground warp threads. ing. However, as mentioned above, in the conventional heald frame hanging device, the cam follower connected to the heald frame for discarded warps tends to separate from the driving cam, so the cam and cam follower collide, causing damage to parts and discarding. This will also affect the opening movement of the ear warp threads.

The object of the present invention is to provide a simple device in which the heald frame for warp threads can be easily followed by a driving cam, and the heddle frame can reliably perform the weft end capturing function.

In order to achieve the object of the present invention, the torque acting on the jacket lever connected to the heald frame for loose warp yarns may be made larger than the torque acting on the jacket lever of the heald frame for ground warp yarns.

Increasing the torque acting on the jack lever can also be achieved, for example, by increasing the tension of a spring used in a heald frame for selvedge warp yarns. However, this method is complicated because it is necessary to prepare springs with different tensions depending on whether they are used in the heald frame for discarded warp yarns or the heald frame for ground warp yarns.

Therefore, in the present invention, a plurality of jacket levers are swingably attached to a support shaft, and a hanging rope connected to a heald frame for ground warp yarns or a heald frame for waste warp yarns and a heald frame are suspended from each jacket lever. In a heald frame hanging device in which a spring is hung for the heald frame, the spring hanging point on the jacket lever connected to the heald frame for the ground warp is higher than the spring hanging point on the jacket lever connected to the heald frame for the ground warp. is also configured to be located away from the support shaft. In other words, in the case of a heald frame for heald warp yarns with selvedges, the distance between the line of action of the spring force acting on the spring hanging point and the support shaft is larger than in the case of a heald frame for ground warp yarns. As a result, the torque acting on the jacket lever connected to the heald frame for the heddle warp yarns is increased, and the force for pulling up the heald frame for the heald warp yarns can be increased. In addition, in the device of the present invention, springs having substantially the same performance may be used in the heald frame for ground warp yarns and the heald frame for discarded warp yarns, depending on the case, and the position of the spring hooking point may be Jack levers that are otherwise substantially identical in shape may be used.

In addition, when the spring latching point is provided on the jack lever via a bushing, the shape of the jack lever excluding the bushing can be made substantially the same for the heald frame for the selvedge warp and the heald frame for the ground warp. . Therefore, since a jack lever having substantially the same shape can be used for both the heald frame for the selvedge warp and the heald frame for the ground warp, the apparatus of the present invention can be manufactured at low cost.

Furthermore, the bush may have a laterally symmetrical outer shape, and the spring retaining point may be located at a position offset from the axis of symmetry of the outer shape. In this case, bushes having substantially the same shape can be turned over left and right with the heald frame for the selvedge warp and the heald frame for the ground warp and attached to the respective jack levers.
Therefore, since a jack lever having substantially the same shape and a bush having substantially the same shape can be used for the heald frame for discarded warp yarns and the heald frame for ground warp yarns, the apparatus of the present invention can be manufactured at a lower cost. can be made.

The present invention will be described in detail below based on an embodiment shown in the accompanying drawings.

In the heald frame hanging device of the present invention, as shown in FIG. 1, a jack lever 2 is swingably attached to a support shaft 1. A hanging rope 5 connected to a heald frame 4 is hooked to the rope side end 3 of the jack lever 2. A spring attachment arm 9 having a plurality of springs 13 attached to its lower end is hooked to the tension side end 7 of the jack lever 2. The lower ends of the plurality of springs 13 are supported by the spring holding arm 11.
is attached to a bracket 12 fixed to the frame of the loom. The positions of the hanging rope 5 and the spring attachment arm 9 shown in solid lines in FIG. 1 indicate their respective positions when the heald frame 4 is lowered. 1st
The positions of the hanging rope 5 and the spring attachment arm 9 indicated by two-dot chain lines in the figure indicate their respective positions when the heald frame 4 is raised.

In a preferred embodiment of the present invention, a jack lever 2 of the same shape and a spring 13 of the same performance are used for the heald frame for the selvage warp and the heald frame for the ground warp.

In this embodiment, the spring attachment arm 9 is attached to the jack lever 2 via a bush 8. That is, the bush 8 is attached to the tension side end 7 of the jack lever 2. An engagement shaft 14 is provided at the tip of the spring mounting arm 9 in a direction perpendicular to the spring mounting arm 9 . As shown in FIG. 4, the bush 8 has a laterally symmetrical outer shape. A bearing portion 15 for locking the engagement shaft 14 of the spring mounting arm 9 is provided on the bush 8 so as to be offset from the axis of symmetry of the outer shape. on the other hand,
The tension side end 7 of the jack lever 2 is provided with a recess corresponding to the outer shape of the bush 8, that is, a symmetrical recess.

In the heald frame hanging device of this embodiment, the bush 8
The jack lever 2 is shaped as described above. As shown in FIG. 2, the bush 8 is attached to the jack lever 2 connected to the ground warp heddle frame with the bearing 15 facing left. On the other hand, there is a third
As shown in the figure, the bushing 8 having the same shape is turned over from side to side and attached with the bearing portion 15 on the right side.
A spring mounting arm 9 is hooked to each of the bearing portions 15 via an engagement shaft 14 . Therefore, the spring latching point on the jacket lever connected to the heald frame for the ground warp is provided at a position farther from the spindle 1 than the spring latching point connected to the heald frame for the ground warp. . As a result, the distance l from the support shaft 1 to the line of action of the spring tension on the jacket lever 2 connected to the heddle frame for ground warp yarns is greater than the distance l from the support shaft 1 to the line of action of the spring tension on the jacket lever 2 connected to the heddle frame for ground warp yarns. The distance L from axis 1 increases. Therefore, a large torque acts on the jacket lever 2 connected to the heald frame for the selvedge warp yarns.

The bush may be made of metal or synthetic resin.
If it is made of synthetic resin, it can be mass-produced and manufactured at low cost, and it is also useful for preventing wear of the engagement shaft 14 of the spring mounting arm 9.

In the heald frame hanging device of the present invention, the spring hooking point of the jacket lever 2 connected to the heald frame for discarded warps can be provided at a position away from the support shaft. Therefore, a larger torque is applied by the spring to the jacket lever connected to the heald frame for the ground warp yarns than to the jacket lever connected to the heald frame for the ground warp yarns. Therefore, when the heald frame for the heddle warp is lowered by the shedding movement, a stronger spring tensile force acts on the heald frame for the heald warp than the heald frame for the ground warp. As a result, the followability of the heald frame for the selvedge warp yarns to the driving cam becomes reliable, and the shedding movement of the selvedge warp yarns can be performed satisfactorily.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a heald frame hanging device in a loom of the present invention, and Fig. 2 shows a state in which a spring mounting arm is hooked to a jack lever connected to a heald frame for ground warp of the device of the present invention. FIG. 3 is a front view showing the spring mounting arm hooked to the jack lever connected to the heddle frame for heald warps of the device of the present invention, and FIG. 4 is a front view of the bush of the device of the present invention. FIG. 1... Support shaft, 2... Jack lever, 3... Rope side end, 4... Heald frame, 5... Hanging rope, 7... Extension side end, 8... Bush, 9...
Spring mounting arm, 11... Spring holding arm, 12... Bracket, 13... Spring, 14... Engagement shaft, 15... Bearing portion.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A plurality of jacket levers are swingably attached to a spindle, and each jacket lever has a hanging rope and a heald frame connected to a heald frame for ground warp yarns or a heddle frame for selvedge warp yarns. In a heald frame hanging device in which a spring for lifting is hung, the spring hanging point can be changed depending on whether the jack lever is connected to a heald frame for selvedge warp or when connected to a heald frame for ground warp. A heald frame hanging device characterized in that a bushing is attached. 2. The heald frame hanging device according to claim 1, wherein the bush has a bilaterally symmetrical outer shape, and the spring hooking point is located at a position offset from the axis of symmetry of the outer shape.