JPH0619580Y2 - Positive cam drive device in shedding device of loom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a positive cam drive device in a shedding device of a loom.

2. Description of the Related Art Conventionally, a shedding device provided with a positive cam in a loom has been constructed as follows. That is, in FIG. 3, there is a trader shaft 21 driven by a loom drive motor (not shown) through an appropriate transmission means, and a plurality of trader levers 22 (in the direction perpendicular to the plane of the drawing, are overlapped with each other). Is swingably supported on the shaft. Two cam rollers 23, 23 are attached to the trader lever 22 at symmetrical positions with the same radius and a certain distance from the swing center, and a connecting rod 24 connected to a heddle frame 25 is attached separately. Has been.

Further, a spur gear 26 is detachably attached to the trader shaft 21, and a cam shaft 28 having a spur gear 27 that meshes with the spur gear 26 has a certain distance on the same horizontal plane as the trader shaft 21. It is vertically removably supported in the retained position. A plurality of positive cams 29 are attached to the cam shaft 28. The positive cams 29 are configured to engage with the cam rollers 23 of the trader shaft 29. When the loom body is driven, the trader shaft 21 is moved. By rotating the cam shaft 28 via the spur gear 26 and the spur gear 27, the two cam rollers 23, 23 engaged with the positive cam 29 via the positive cam 29 fixed to the cam shaft 28. By Trader Lever 2
2 makes an oscillating motion about the tradel shaft 21, and as a result, the heald frame 25 makes a reciprocating motion in the vertical direction via the connecting rod 24 attached to the trader lever 22.

The problem to be solved by the present invention is that, when changing the fabric structure, it is necessary to replace the positive cam attached to the cam shaft with a different shape or a spur gear with a different number of teeth.

At this time, when the bolt is loosened from the mounting seat of the housing and then removed and moved in the vertical direction, the cam shaft and the tradel shaft are arranged on the same horizontal plane. In addition to the weight of multiple positive cams and spur gears attached to the trade lever, the load of the opening system transmitted from the heald frame through the connecting rod is added to the trade lever. The load was also applied from the side of the cam shaft via the cam roller.

For this reason, when the cam shaft is lifted in the vertical direction and attached or detached,
The load from this opening system must be removed, and its attachment and detachment is extremely difficult.

Therefore, the present invention is intended to solve the above-mentioned drawbacks.
The purpose of this invention is to provide a positive cam drive device which has an extremely simple structure and in which the load from the opening system of the heddle frame does not affect the attachment / detachment action of the cam shaft. The means of taking is adopted. That is, the shaft center of the cam shaft to which the positive cam is attached is provided so as to be located above the shaft center of the tradel shaft to which the trader lever connected to the heald frame is attached in the horizontal direction. Also, the cam shaft is supported by the housing so as to be movable in the horizontal direction.

EXAMPLE An example of an apparatus for carrying out the present invention will be specifically described with reference to the drawings. In FIGS. 1 and 2, reference numeral 1 denotes a trader driven from a loom drive motor (not shown) through an appropriate transmission means. A trader lever 3 connected to the heddle frame 2 is swingably supported on the shaft. Reference numerals 4 and 4 denote cam rollers attached to the trade lever 3, and the rollers are symmetrically arranged with the radius of the trade shaft 1 as the center. Reference numeral 5 denotes a cam shaft to which a positive cam 6 is attached, and the cam shaft is arranged so that its axial center is located above the axial center of the trader shaft 1 in the horizontal direction. The cam shaft 5 is supported by the housing 7 so as to be movable in the horizontal direction.

Incidentally, spur gears are attached to the trade shaft 1 and the cam shaft 5, but the mounting state of these is the same as in the conventional example, and therefore the details thereof are omitted.

Reference numeral 9 denotes a slide block that supports the camshaft 5, and the slide block is mounted on the inner surface of the housing 7 and is horizontally slidably mounted between a pair of upper and lower guide plates 10 and 11. Reference numeral 13 is a rotary plate which is rotatably mounted on the inner surface of the housing about a shaft 14 as a fulcrum.
The rotary plate 13 is provided with an arc groove 13a having an arc center at a position eccentric to the rotary shaft center. A cam follower 12 attached to one end of the slide block 9 is engaged with the circular arc groove 13a. Reference numeral 15 is a handle detachably attached to the rotating plate 13.

Now, when the cam shaft 5 is arranged at an upper position in the horizontal direction with respect to the trader shaft 1, the trader lever 3 pivotally supported on the trader shaft 1 is conventionally Therefore, the heddle frame 2 attached via the connecting rod 8 attached to the trade lever 3 is arranged so as to be inclined from the vertical direction to the upper right direction.
The load of the opening system from is not applied in the vertical direction by the upper cam roller, and the load is reduced as compared with the conventional one.

By the way, at the time of changing the structure of the woven fabric, when the attachment / detachment work of the cam shaft 5 to which the positive cam is attached is performed, first, the bolts fixing the slide block 9 supporting the cam shaft 5 to the housing 7 are loosened. Then, with the handle 15, the rotating plate 13 is rotated counterclockwise about the shaft 14 as a fulcrum. By the rotation of the rotation plate 13, the slide block 9 slides in the circular arc groove 13a formed in the rotation plate 13 through the cam follower 12, and slides in the left direction in the drawing along the guide plates 10 and 11. Move. As a result, the cam shaft 5 supported by the slide block 9 is attached to the heddle frame 2
No side pressure from the opening system is received, and only the positive cam fixed to the camshaft 5 and the spur gear are self-weighted. Therefore, the replacement work of the camshaft can be performed very easily.

Effects The present invention is arranged such that the axis of the cam shaft with the positive cam attached as described above is located above the axis of the trader in the horizontal direction and moves in the horizontal direction of the cam axis. Since it is supported by the housing as much as possible, the cam shaft for replacing the positive cam when changing the fabric structure can be attached and detached more easily than the conventional one.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of a drive device having an active cam drive device embodying the present invention when a loom is opened, FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG. 3 is a conventional active cam drive device. FIG. 1 ... Tradle shaft, 3 ... Tradle lever 5 ... Cam shaft, 6 ... Positive cam 7 ... Housing

Claims (1)

[Scope of utility model registration request] 1. A shaft center of a cam shaft having a positive cam attached is provided so as to be located above the shaft center of a tradel shaft having a trader lever connected to a heald frame in the horizontal direction. An active cam drive device in a shedding device of a loom, characterized in that the cam shaft is supported by a housing so as to be movable in a horizontal direction.