JPH0527506Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] It is used in an apron draft device installed in a roving frame or a ring spinning frame used in the spinning process, and in particular, a top apron roller attached to the waiting arm side. is configured to be held parallel to the bottom apron roller to ensure a reliable drafting effect.

[Prior Art] It is well known that an apron draft device is used as a draft device for a spinning machine. In addition, among these apron draft devices, a single apron draft device in which either the top side or the bottom side is an apron type,
It is also well known that there is a double apron draft device in which both the top and bottom sides are apron-type. In particular, the latter type of double apron draft device is commonly used in the draft device of ring spinning machines. FIG. 1 (partially cutaway side view) shows only the main parts of a double apron draft device suitable for applying the present invention, and this draft device consists of a front bottom roller 1, a bottom apron roller 2, a third The roller 8 and a back roller group (not shown) constitute a bottom roller group, and the bottom apron roller 2 is covered with a bottom apron 4 surrounding a tensile bar 7 provided between the front bottom roller 1 and the bottom apron roller 2. The bottom apron 4 is properly tensioned and supported by a guide steel plate 7a inserted into the top side of the tensile bar 7 and a tension guide member 7b provided at the lower part of the tensile bar 7 to form a bottom apron device. are doing.

On the other hand, on the upper side of the bottom roller group, a front top roller 1a, a top apron roller 3,
A third top roller 8a and a back top roller (not shown) are provided, and the support shafts of these top roller groups are supported by arms 1b and 8b attached to the waiting arm 13, respectively. The top apron device includes top apron rollers 3 that are pivotally supported on both sides of a support shaft 3a and combined with a cradle 6, and a top apron 5 is stretched around the outer periphery of the cradle 6 and the top apron roller 3. . The top apron 5 is supported under tension by a top tensor 5a which is provided in a protruding manner on the distal end side of the base portion of the cradle 6, thereby forming a top apron device. By the way, the top apron device configured in this way is shown in Fig. 2 (a plan view showing only the top apron device in Fig. 1 removed) and Fig. 3 (a cross-sectional view in the direction of the arrow along the cutting line - in Fig. 2). ), the central narrow diameter part of the support shaft 3a of the top apron roller 3 is fitted into the lower open support groove 10a formed on both side walls of the support arm frame 10, and the spring plate supported on the cradle side (Fig. (not shown) holds the support shaft 3a so that it does not fall out of the support groove. The support arm frame 10 has its swing fulcrum pivoted on a shaft 11 installed on the lower side of a pressure spring case body 9 attached to a waiting arm 13, and the pressure spring case body 9 is open at its lower side. The pressure spring 12 is housed inside. The pressure spring 12 is pressurized and housed between a support seat 12a provided on the upper side of the case body 9 and the back wall of the support arm frame 10, and the support arm frame 10 is formed on the upper part of the back wall. The protruding portion 10b is moored to a window hole 9a formed on the top surface of the pressurizing spring case body 9. Therefore, when the top apron device is held under pressure, the front surface of the position regulating leg 6a of the cradle 6 comes into contact with the guide steel plate 7a inserted into the tensile bar 7 as shown in FIG. 1, as shown in FIG. At the same time, the top apron rollers 3, 3 are pressurized and supported on the bottom apron roller side by swinging pressure by the support shaft 11 of the support arm frame 10 via the support shaft 3a.

Incidentally, the combination of the cradle 6 and the roller support shaft 3a is such that the lower open bent portion of the support arm frame 6b provided on the cradle 6 side is formed so as to cover the upper half of the support shaft 3a. The support arm frame 10 is inserted between the support arm frames 6a and grips the support shaft 3a, and in this gripping state, the support shaft 3a is inserted into the open support groove 10a of the support arm frame 10 as shown in FIG. When fully fitted, the support shaft 3a is pressurized by the bottom surface of the support groove 10a and the top surface of the support shaft 3a.

[Problems to be Solved by the Invention] In the top apron roller support device configured as described above, the support shaft 3a and the support arm frame 10 are assembled with no margin at all. Therefore, if the mounting of the waiting arm 13 or the mounting of the pressurizing spring case body 9 is in accordance with the regulations, the top apron roller 3 and the cradle 6 will be correctly supported under pressure on the bottom apron, but if the waiting arm 13 is not manufactured properly. Due to errors, wear and tear of the pivot portion, or improper or incorrect installation of the pressure spring case body 9, the top apron roller 3 may not be installed parallel to the bottom apron, or a load difference may occur. For this reason, consideration was given to allowing the pivot portion of the support arm frame 10 to have a margin in the pressurizing spring case body 9 so that the support arm frame 10 could swing slightly, but it was pointed out that this would be unstable. Furthermore, when an apron draft device is used in which the distance between the top apron roller 3 and the tip of the cradle 6 is shortened in order to improve draft control of short fibers, it is necessary to check whether the position of the cradle is properly regulated. Difficult to identify. Also, the handling operator simply anchors the waiting arm 13 under pressure and does not monitor the installation, believing that the cradle and top apron rollers are correctly positioned. Therefore, products that do not provide a uniform draft may be produced due to wear and tear, poor installation, etc. as described above.

Therefore, the present invention is based on the spindle 3 of the top apron roller.
By improving the supporting means between the supporting arm frame 10 and the support arm frame 10, when the top apron roller is supported under pressure, the cradle 6 is configured to self-center along with the support shaft 3a and the cradle 6 along with the bottom apron device. When lifting the top apron device by releasing the load on the holding arm, move the support shaft 3a to the supporting arm frame 10.
The structure is such that it is held securely and prevented from falling off.

[Means for Solving the Problems] That is, the present invention is such that the shaft supporting portion of the lower open support groove formed in the support arm frame is made longer in the front and back direction, and the cradle is supported within the support frame under pressure. The support shaft is positioned in the middle of the support groove, and a bent plate spring is interposed to hold the support shaft in pressure contact with the front side of the support groove when the pressure is released.

[Example and operation] The present invention will be explained in detail below based on the drawings. However, the drawings show an example of a specific implementation of the present invention, and the present invention is not limited to the illustrated example. It is possible to similarly implement the top apron device with a part of the configuration changed or with a different configuration depending on the purpose. FIG. 4 (side view) shows a top apron roller support shaft retaining device to which the present invention is applied, which is applied to a support arm frame 10 that is an improved part of the support arm frame 10 in FIG. It shows. That is, the present invention has a support shaft 3 formed on the support arm frame 10.
a lower open support groove 10a (Fig. 3) on the support shaft 3.
The support groove 14 is a long hole formed horizontally toward the rear side (right side in the drawing) in the support part of a, and the support arm frame 1
A bending plate spring 15 is provided inside 0. FIG. 6 (sketches) is an enlarged view of only the support arm frame 10 shown in FIG.
is passed through and pivotally supported by the pressurizing spring case 9. The leaf spring 15 provided within the support arm frame 10 is formed by bending as shown in FIG. 7 (schematic diagram). That is, the leaf spring 15 has a curved portion 15a on its top side, and a planar portion on its rear side, with a mooring bent portion 15b formed at its tip. On the other hand, curved portion 15a
The front side is curved into a tongue shape and folded back, and the front side of the tongue is formed by a curved surface 15d having a large diameter circumferential surface and a holding curved surface 15e having a circumferential surface along the outer circumferential surface of the support shaft 3a. Then, it is folded back to form a small diameter curved portion 15c at the lower part of the mooring bent portion 15b. When installing the leaf spring 15 bent in this way on the support arm frame 10, the small diameter curved portion 15c
is hooked onto the support shaft 11 of the support arm frame 10, and then the mooring bent portion 15b is engaged with the lower end edge of the rear wall of the support arm frame 10. Therefore, the planar portion of the leaf spring 15 is provided along the inner side of the rear wall of the support arm frame 10, and the tongue-like tip small diameter curved portion 15c is attached to the support shaft 3a fitted in the long hole support groove 14. The support shaft 3a is biased and bent along the circumferential surface so as to press the support shaft 3a toward the front side of the support groove 14. That is, the fourth
The figure shows a state in which the cradle 6 and the support shaft 3a are supported under pressure, and the cradle 6 and the support shaft 3a are held with the position regulating leg 6a of the cradle in contact with the guide steel plate 7a (see FIG. 1). At this time, the support shaft 3a is configured to be supported in the middle of the support groove 14, and the cradle 6 is urged forward via the support shaft 3a by the leaf spring 15, and the support shaft 3a The load acts almost vertically at point A due to the tilting movement of the support arm frame 10 by the support shaft 11. In this state, the support shaft 3a can be tilted in the penetrating direction of the paper within the range of the gap formed in the front and back in the support groove 14 of the support arm frame 10, and this tilt is the permissible tilt range of the cradle 6, and the above-mentioned restrictions The top apron device can be correctly positioned on the bottom apron device by making sure that the legs 6a abut each guide steel plate 7a.

FIG. 5 (side view for explaining the operation in FIG. 4) shows a state in which the load engagement of the waiting arm 13 is released and the top apron device is separated upward from the bottom apron device, and the cradle 6 is in the restricted position. At the same time as the leg 6a is released away from the tensor portion, the support shaft 3a is pressed against the front wall of the support groove 14 by the leaf spring 15. Since the tongue-shaped tip of the leaf spring 15 forms a curved surface 15e along the support shaft 3a, the support shaft 3a is held in the support groove 14 and prevented from falling off, and the pressurizing spring case 9 and the support arm frame The entire cradle together with 10 is detached and retracted above the bottom apron device and is held there.

[Effects of the invention] Since the holding device for the top apron roller support shaft of the present invention is constructed in this way, the support arm frame that holds the support shaft allows the support shaft to tilt in a pressurized state, and the device is provided within the support arm frame. The leaf spring allows the cradle to be correctly positioned, and also allows the support shaft to be held in the support groove when the load is released. This makes it possible to ensure that the top apron device runs parallel to the bottom apron device, resulting in a good drafting effect.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view showing an example of a draft device suitable for applying the present invention, Fig. 2 is a plan view taken out of a part of Fig. 1, and Fig. 3 is a cutting line of Fig. 2. 4 is a side view of the device of the present invention, 5 is a side view explaining the operation of 4, FIG. 6 is a sketch of the support arm frame, and 7 is a sketch of the leaf spring. It is. 1...Front bottom roller, 2...Bottom apron roller, 3...Top apron roller, 3a...Spindle, 4...Bottom apron, 5
...Top Apron, 6...Cradle, 7...
Ten bar, 8... Third roller, 9... Pressure spring case body, 10... Support arm frame, 11... Support shaft, 12... Pressure spring, 13... Wacing arm, 14... Horizontal support Groove, 15... leaf spring.

Claims (1)

[Scope of utility model registration request] A holding device in which a support shaft that freely supports the top apron roller on both ends is fitted and held in a lower open support groove of a support arm frame pivotally supported on the lower side of the pressure spring case body together with the cradle. The shaft supporting portion of the lower open support groove formed in the arm frame is formed to be longer in the front-rear direction, and when the cradle is supported under pressure within the support arm frame, the shaft is positioned between the support grooves and pressurized. 1. A top apron roller support shaft holding device comprising a bent plate spring which presses and holds the support shaft against the front side of a support groove when the support groove is released.