JPS6360133B2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention relates to spinning machines such as spinning machines and twisting machines.
This invention relates to a doffing device installed in an automatic tube changing machine that changes bobbin tubes.

Prior art The dotting device installed in the automatic pipe changing machine is
In a spinning machine such as a spinning machine or a twisting machine, a full bobbin is pulled out from the spindle, and the bobbin is guided to a full bobbin container equipped in an automatic tube changer, and in some cases, it is transferred to an automatic tube changer instead. It serves to insert the built-in empty bobbin into the spindle. In conventional doffing devices, the vertical movement and back-and-forth movement of the bobbin gripping device are generally performed separately, and in order to prevent the bottom end of the bobbin from getting caught on the spindle, the bottom end of the bobbin is placed above the top of the spindle (spindle top).
The structure is such that the bobbin cannot be evacuated to the rear while gripping the bobbin until after the bobbin has moved upward. The doffing stroke is therefore limited by spindle length and bobbin lift. Generally, in spinning machines such as ring spinning machines and yarn twisting machines, a draft part consisting of a draft roller, clearer roller, etc. is provided in a protruding state above the spindle. Therefore, it is necessary to configure the bobbin gripping device to move avoiding the roller part, and the upward stroke of the bobbin gripping device is restricted.

Furthermore, even if sufficient space is secured between the spindle top and the roller part, a mechanism in which the bobbin gripping device retracts backward when the bottom end of the bobbin moves above the spindle top (vertical doffing) The stroke of the device must be increased. In general, an intermittent movement type automatic tube changer that moves intermittently along the spindle row of a spinning machine and changes tubes sequentially, has a bobbin supply section above the dotting device and a bobbin storage box, so that the bobbin can be gripped easily. As the stroke of the device increases, the position of the bobbin storage box inevitably becomes higher, resulting in a drawback that workability during attachment and detachment of the bobbin storage box deteriorates.

Purpose This invention was made in order to eliminate the defects in the conventional device, and the purpose is to shorten the upward stroke of the bobbin gripping device, and to securely hold the bobbin gripping device against protruding parts such as the roller parts of the spinning machine. To provide a doffing device for an automatic tube changer, which can be moved in an avoidable manner and can improve workability when attaching and detaching a bobbin storage box disposed in an upper part of the tube changer.

Embodiment Hereinafter, an embodiment embodying the present invention will be described in the first to
This will be explained according to FIG. The machine body 2 is located at the center of the spinning machine side of the machine body 2 of an automatic tube changing machine that moves along the longitudinal direction of the spinning machine table 1 and changes the tubes of multiple spindles at the same time.
A doffing device 6 is provided which serves to release the bobbin 4 into a chute 5 which guides the bobbin 4 to a full bobbin storage container (not shown) provided in the machine. As shown in FIG. 2, a drive shaft 8 is supported by a pair of left and right brackets 7 arranged at a predetermined interval in the upper part of the body 2 so as to be rotatable in forward and reverse directions. At one end of the drive shaft 8 is a drive source such as a motor (not shown).
a bevel gear 9 that transmits forward and reverse rotation from the drive shaft 8 to the drive shaft 8;
is fixed. Further, a pair of pinions 10 are fitted onto the drive shaft 8 on the outside of the bracket 7.

A pair of left and right brackets 11 are provided below the front side of the bracket 7, and a pair of guide rods 12 are respectively provided upright between the upper and lower brackets 7 and 11 facing each other. A pair of left and right cams 13 are disposed below the rear side of the bracket 7 so that their cam grooves 13a face each other. A pair of holders 14 are supported on the left and right guide rods 12 so as to be movable up and down, and are movable up and down along the guide rods 12 via racks 15 fixed to the outer surface of each holder 14 and meshing with the pinion 10. It's summery. Each holder 14 is provided with a lever 16 having a cross-sectional shape, as shown in FIGS.
The cam 13 is supported so as to be movable back and forth via a guide roller 17 provided thereon, and a roller 18 that engages with the cam groove of the cam 13 is rotatably supported by a shaft 19 at its rear end. A boss portion 20 is provided protruding from the inside of the front end of both levers 16, and an end portion of a support shaft 21 is fitted into a fitting hole 20a provided in the boss portion 20, and is fixed unrotatably by a pin 22. There is.

The support shaft 21 has a plurality of (8 in this embodiment)
A doffing bar 24, which is equipped with several bobbin gripping devices 23 at the same spacing as the spindle 3, is suspended via a bracket 25 so as to be rotatable and slidable. The bracket 25 is attached to the support shaft 21 via a metal 26 so that the bracket 25 can rotate and slide smoothly.
is penetrated into the A spring 27 is wound around both ends of the support shaft 21 between the boss portion 20 and the bracket 25, so that the support shaft 21 is held in a fixed position by the dotting bar 24.

Attachment grooves 30 to which the fixed gripping piece 28 and the movable gripping piece 29 of the bobbin gripping device 23 are attached are formed on the upper surface of the dotting bar 24 so as to be perpendicular to the downward longitudinal direction of the dotting bar 24, as shown in FIG. At the front of the mounting groove 30, the upper part of a guide hole 31 for guiding the bobbin 4 is open, and at the rear thereof, a recess 30a is formed. A guide groove 3 is provided on the upper surface of the dotting bar 24.
A screw hole 32 is formed along the
A cover 34 covering the mounting groove 30 is fixed to the dotting bar 24 by a bolt 33 that is screwed into the dotting bar 24. As shown in FIG. 6, a through hole 34a corresponding to the upper opening of the guide hole 31 is formed in the front part of the cover 34, and a recess 34b corresponding to the recess 30a is formed in the rear part.

As shown in FIG. 6, the bobbin gripping device 23 includes a fixed gripping piece 28 fixed to the front part of the mounting groove 30 by a pin 35 passing through the cover 34, and a movable gripping piece provided so as to be movable back and forth within the mounting groove. Piece 2
9, and a piston 3 that operates the movable gripping piece 29.
6 and a cylinder 37.
A buffer member 38 is fixed to the opposing gripping portions of the fixed gripping piece 28 and the movable gripping piece 29, respectively, and the movable gripping piece 29 is always held backward by a spring 39 disposed in the mounting groove 30 and the recesses 30a, 34b of the cover 34. is being energized. An intermediate position between the gripping portions of the fixed gripping piece 28 and the movable gripping piece 29 is configured to be located forward of the center position of the support shaft 21 on which the dotting bar 24 is suspended. The cylinder 37 is connected to the dotting bar 2 by the bolt 40.
4 is fitted and fixed in a fitting hole 42 provided in a fixing plate 41 fixed to the rear end surface of 4. cylinder 37
A connecting pipe 44 connected to a pipe 43 that leads pressure fluid from a pressure fluid supply source (not shown) is connected to the rear part of the pressure fluid supply source (not shown).

As shown in FIG. 7, the dotting bar 24 has bolts 4 screwed into screw holes 45 provided at both ends.
6, it is fixed to a bracket 25 integrally projecting from the cover 34. dotu flying bar 24
A pair of latching hooks 47 are fixed to both ends of the rear surface of the fixing plate 41 fixed to the rear end surface, and a pair of latching hooks 47 are provided between the latching hooks 47 and the protruding end of the shaft 19 provided on the lever 16. A tension spring 48 is attached, and urges the dotting bar 24 to rotate counterclockwise in FIG. 6 about the support shaft 21. Engagement protrusions 49 are provided at both ends of the upper surface of the fixed plate 41, and when the engagement protrusions 49 come into contact with the lower surface of the lever 16, the rotation of the dotting bar 24 is restricted, and the dotting bar 24 is placed in a horizontal state. is now being maintained.

When the bobbin gripping device 23 grips the tip of the bobbin 4, it is necessary to grip the circumferential surface of the tip of the bobbin 4 evenly in order to reliably pull out the bobbin 4. Therefore, it is certain that the doffing bar 24, which is rotatable around the support shaft 21, is kept in a horizontal state by the tension spring 48 and the engagement protrusion 49. This is an important matter for drawing out the bobbin 4.

Next, the operation of the doffing device configured as described above will be explained. The automatic tube changer moves along the spinning machine and each bobbin gripping device 23 stops at a fixed position corresponding to the spindle 3. Next, due to normal rotation of a drive source such as a motor, the drive shaft 8 is rotated counterclockwise in FIGS. 1 and 2 via the bevel gear 9, and the pinion 1
0, the holder 14 is lowered along the guide rod 12 via the rack 15. Since the roller 18 supported at the rear end of the lever 16 rolls along the cam groove 13a, the lever 16 supported by the holder 14 via the guide roller 17 is pushed forward while descending together with the holder 14. . After the lever 16 is pushed out to a position where the center of the guide hole 31 provided in the dotting bar 24 corresponds to the axis of the bobbin 4, the lever 16 descends while maintaining this state and grips the bobbin gripping device 23. 8 is loosely fitted into the head of the bobbin 4 on the spindle 3, as shown by the chain line in FIG. Since the dotting bar 24 is slidably suspended relative to the support shaft 21, even if the automatic tube changing machine slightly deviates from the fixed position corresponding to the spindle 3 and stops, the sloped part of the guide hole 31 will not disturb the bobbin. The dotting bar 2 is pressed by the head of the dotting bar 2 against the force of the spring 27.
4 is moved in parallel, and the gripping portion of the bobbin gripping device 23 is reliably fitted loosely into the head of the bobbin 4.

Thereafter, pressure fluid is supplied from a pressure fluid supply source (not shown) to each cylinder 37 via the connecting pipe 44 or the like, and the piston 36 is pushed forward.
As a result, the movable gripping piece 29 is pushed forward against the force of the spring 39, and the head of the bobbin 4 is firmly clamped and gripped between the fixed gripping piece 28 and the lower end gripping piece 29.

In this case, since the dotting bar 24 is maintained in a horizontal state by the tension spring 48 and the engagement protrusion 49, both the fixed gripping piece 28 and the movable gripping piece 29 are in close contact with the tip of the bobbin. Has a strong gripping action.

Next, the drive shaft 8 is reversed by reversing the driving source such as a motor, and the holder 14 is raised along the guide rod 12 via the pinion 10 and rack 15.
Since the bobbin 4 is held in front of the support shaft 21, the force acting on the dotting bar 24 when the bobbin 4 and the spindle 3 are disengaged from each other is applied to the dotting bar 24 in a direction centered around the support shaft 21. This is the force that rotates it counterclockwise as shown in Figure 8.
However, the counterclockwise rotation of the dotting bar 24 is caused by the engagement convex portion 49 abutting the lower surface of the lever 16.
The dotting bar 24 is held in a horizontal state. As the holder 14 rises, the lever 16 is guided by the roller 18 moving along the cam groove 13a and moves backward at the same time as the holder 14 rises. In order to move the dotting bar 24, the lever 16, etc. while avoiding the protruding parts such as the roller part 50 on the upper part of the spindle 3, the lever 16 is moved when the lower end of the bobbin 4 is located below the top of the spindle 3. Cam groove 13a so that backward movement begins
is formed. Then, as shown by the solid line in FIG. 8, the lever 16 moves back with the lower end of the bobbin 4 caught on the spindle 3, but since the dotting bar 24 is rotatably suspended via the bracket 25, The dotting bar 24 is rotated clockwise in FIG. 8 about the support shaft 21 against the force of the tension spring 48. When the lower end of the bobbin 4 comes off the top of the spindle 3, the dotting bar 24 is rotated counterclockwise by the action of the tension spring 48, as shown in FIG.
The dotting bar 24 is held in the horizontal position again by the engagement convex portion 49 coming into contact with the lower surface of the lever 16. Then, when the supply of pressure fluid to the cylinder 37 is stopped, the movable gripping piece 29 is moved back and returned to the rear by the action of the spring 39, and the bobbin 4
The clamp grip is released. Bobbin 4 is chute 5
and is guided to a full bobbin container (not shown) provided in the machine body 2.

Even if the dotting bar 24 moves backward while the bobbin 4 is caught on the spindle 3, no excessive force will be applied to the spindle 3 because the dotting bar 24 is configured to be rotatable around the support shaft 21. It never works. In this dotting device, when the lower end of the bobbin 4 is located below the top of the spindle 3, the dotting bar 2
Since the backward movement of step 4 begins, the stroke is reduced by 1 compared to the case where vertical doffing is performed as shown by the chain line in FIG. 9, and the height of the automatic pipe changer can be lowered.

In the case of vertical dotting, the tail thread 51 connected to the full bobbin 4 may come off above the spindle 3 together with the bobbin 4, or gripping of the tail thread 51 becomes unstable, causing thread breakage when the spinning machine is restarted. However, in the device of the present invention, the upward stroke of the dotting bar 24 is small, and when the bobbin 4 comes off the top of the spindle 3 and rotates to the vertical position, the tail thread 51 remaining on the spindle 3 is pulled laterally. Tension is applied to the tail thread 51 and a winding action is performed, ensuring thread gripping and reducing thread breakage when restarting the spinning machine. Further, since tension is applied to the thread connected to the bobbin 4, the thread can be easily cut by the cutter.

Note that the present invention is not limited to the above-described embodiment, and the cover 34 that covers the bobbin gripping device 23
The shape and structure of each part may be arbitrarily changed without departing from the spirit of the present invention, such as by integrally forming the bobbin 4 or using a gripping device that grips the bobbin 4 from the left and right instead of the front and back. It is possible.

Effects As detailed above, the present invention uses a dotting bar equipped with a plurality of bobbin gripping devices to rotate around a support shaft that is located above and rearward of the bobbin gripping portion and extends parallel to the spindle row of a spinning machine. The dotting bar is rotatably suspended, and the dotting bar is urged upward and rearward by an elastic means, and also comes into contact with the support member of the support shaft to restrict rotation of the dotting bar about the support shaft by the elastic means, thereby horizontally moving the dotting bar. By providing an engaging part on the dotting bar to hold the bobbin in position, the bobbin gripping device of the bobbin can smoothly fit onto the tip of the bobbin, and can grip the tip of the bobbin evenly. Even if the bobbin gripping device is moved backward when the bobbin gripping device is located at a lower position, no unreasonable force will be applied to the spindle, and the upward stroke of the bobbin gripping device can be shortened. It is possible to reliably avoid and move the parts. In addition, the height of the dotting mechanism can be lowered, and there is no need to increase the height of the storage section of the bobbin storage box located above it, which reduces work efficiency when installing and removing the bobbin storage box. Moreover, it is possible to make the automatic pipe changer more compact. Furthermore, when the lower end of the bobbin comes off the top of the spindle and rotates to a vertical position, a tightening action is applied to the tail thread, ensuring thread gripping and reducing thread breakage when restarting the spinning machine. be effective.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of the main parts of a spinning machine and an automatic tube changing machine, Fig. 2 is a schematic perspective view of a doffing device embodying the present invention, and Fig. 3 is a partial plan view as well.
Figure 4 is a cross-sectional view taken along line AA in Figure 3;
The figure is a partial perspective view of the dotting bar, FIG. 6 is a cross-sectional view taken along the line B-B in FIG. 3, FIG. It is a side view for explaining. Spindle...3, Bobbin...4, Dotting device...6, Lever...16, Support shaft...2
1. Bobbin gripping device...23, Dotting bar...24, Bracket...25, Cover...3
4. Tension spring...48, Engagement protrusion...49.

Claims (1)

[Scope of Claims] 1. A dotting device for an automatic tube changer configured such that the bobbin gripping device starts moving backward when the lower end of the bobbin is located below the top of the spindle of the spinning machine, which comprises a plurality of bobbin gripping devices. The equipped dotting bar is located at the upper rear of the bobbin grip and is rotatably suspended around a support shaft extending parallel to the spindle row of the spinning machine, and the dotting bar is urged upward and rearward by an elastic member. In addition, the dotting bar is provided with an engaging portion that comes into contact with the support member of the support shaft to restrict rotation of the dotting bar about the support shaft by the elastic member and to hold the dotting bar in a horizontal position. A dotting device for an automatic pipe changer.