JPS63165531A - Autodoffer - Google Patents

Abstract

PURPOSE:To prevent doffing miss and shorten the length of tail yarn, by holding a bobbin head of a full pirn by the expansion and contraction of an elastic material and applying a slight rotation and vertical displacement to the bobbin in held state. CONSTITUTION:A chuck 4a of a working arm 4 is lowered from the upside of a fully wound bobbin 2, a spindle 2b is stopped with a brake press 8a, compressed air is introduced into the chuck 4a and the bobbin top 2a is held by the expansion and contraction of an elastic material. The chuck 4a is rotated by a belt 4b and a gear 4c to release the fitting, rotated while lifting the chuck by a light distance and a yarn is wound several turns round the spindle 2b. The bobbin is lifted to press the tail yarn wound round the spindle 2b with a yarn pressing tool 8c and a cutting tool 8b is inserted under the pirn 2c. The bobbin is turned about one round to wind the yarn around the cutting tool 8b and the tail yarn is cut by pulling the cutting tool 8b.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Technical Field of the Invention Unpublished II relates to an automatic doffing device for spinning spinning a and the like.

B. Prior art and problems There have been proposals for a bobbin (core) gripping mechanism installed in automatic doffing devices such as spinning machines to grip the bobbin head of a full pirn. The conventional proposal was to extract the bobbin from the spindle by slow vertical movement of the gripping mechanism, so if the bobbin and spindle were tightly fitted, the extraction could not be carried out smoothly, and it was always necessary to remove the bobbin during dotting. This method was not effective when taking into consideration the execution of the necessary thread processing.

C. Solution to the problem and operation First, regarding the work of removing the bobbin from the spindle,
After stopping the rotation of a fully wound bobbin in the usual way, when holding the bobbin m section and lifting the bobbin upward while rotating, it is easy to fit the bobbin and spindle. Being able to release and pull out the bobbin, and at the same time rotating the bobbin at low speed and moving it up and down, can be effectively used to process the tail thread.

Hereinafter, the present invention will be explained based on examples.

2. Embodiment In FIG. 1, l is a spinning machine stand, 2 is a spinning unit including a bobbin 2a, a spindle 2b, a pirn 2c, a knee brake 2d, and a traveling ring 2e, which is usually several hundred sides. The spinning units are lined up on the spinning machine stand l in the direction of the front and back of the page. An automatic doffing device is used for this spinning machine.
Doffing is performed while moving along the spinning machine stand.

3 is an automatic doffing device, and 3a is its machine base.

Reference numeral 3b indicates a moving ten wheel, and reference numeral 4 indicates a working arm that actually performs the doffing work.A machine J5 that moves this working arm 4 in the vertical direction is a support 5a, and a slide attached to this support 5a. The block 5b is moved in the front-rear direction (left and right in the drawing) by a mechanism 6 including a horizontal support 6a and a slide block 6b. The working arm 4 is pivotally supported by a horizontal arm 6d,) via a vertical arm 6C and a horizontal arm 6d located in the direction F from the horizontal slide block 6b.

That is, the working arm 4 is a slightly bent inscription.

A chuck 4a for gripping the rirJ portion of the full-volume burn is attached to the tip. Therefore, the chuck is at pivot point 6
It rotates around e, and its rotation is performed by a pneumatic cylinder 7 provided midway through the vertical arm 6C, and in order to follow the rotation, the cylinder 7 pivots at a pivot point 7a. The tip of the cylinder rod 2 is pivotally attached to the arm 4 at a point 7b. The belt 4b and gear 4c are connected to the chuck 4
This is a transmission mechanism for imparting rotation to the chuck 4a, and a mechanism 48 located above the tip of the arm is an intake port for sending pressurized air to the chuck 4a. Regarding these.

This will be explained in detail using FIGS. 2 and 3.

Further, 8 is a water feather arm for operating the knee brake 2d'''g, and a brake presser foot 8a, a cutter 18b for cutting the thread, and a thread presser 8C5 are attached to the tip of the arm.

Figure 2 shows 6 works tllli! This is a partial cross-sectional view of the chuck 4a attached to the tip of the chuck 4.
As explained above, it is necessary to provide the chuck with a force for gripping the head of the bobbin and a mechanism for rotating and moving the chuck itself northward.

In the figure, reference numeral 10 denotes a chuck body made of rubber or elastic plastic material, and its shape is, as shown in FIG. The lower half of the bobbin head 2a is expanded or contracted inward by pneumatic pressure (indicated by dotted lines) to grip the bobbin head 2a. The chuck body IO is airtightly fixed in the chuck 4a by a structure 11, a bottom plate 12, and a cover plate 13 that covers the seven-end circular part of the inner wall, and the hole 14 of the structure 11 is connected to the compressed air inlet 1.
A space 16 continues from 5 and acts on the expansion or contraction of the chuck body.

The rotation of the char is caused by gear 4d connected to gear 4c.
The power is transmitted through the meshing of the gear lla provided on the outside of the structure 11. Moreover, the one-way rotation of the chuck 4a is achieved by the working arm 4 mentioned in the explanation of FIG. ).

Next, it will be described how the chuck and the like described in I- below operate in doffing.

The chuck 4a of the working arm 4 descends from above the fully wound bobbin to a position where it can grip the head. However, at this time it is not gripping the bobbin. Next, the brake presser 8a works to release the head of the bobbin. Apply the brake 2d to stop the spindle. Next, compressed air is introduced into the chuck 4a, and the chuck grips the bobbin head 2a.

We will now begin the unfitting and tail thread processing described in (7) above, but it is desirable to refer to the attached Figure 4 (the tail threads should be la
).

FIG. 4a is an explanatory view including a partial cross section showing a state where the chuck grips the bobbin head, and the bobbin 2a and spindle 2b are fitted together as shown by the reference numeral 2ab (there are two locations). ing. If this fitting is attempted to be released only by the force of pulling up the bobbin, a large force will be required, causing the problem j3 as described above.

In the present invention, first, while the chuck grips the bobbin, it is rotated (approximately 1 rotation) to release the mating, and then the chuck is raised while rotating for a slight distance (usually 5 to 6 cm). During this time, the thread is The bobbin is wound around the spindle 2b several times (this 83 part is indicated by laa), and then the bobbin is raised a little distance (usually 2 to 3 cm) after the bobbin rotation has stopped rising, and then the bobbin is wound around the spindle 2b. The thread presser 8C presses the tail thread 1a, and then the cutting tool 8b goes under the bobbin (pirn). The bobbin is then lowered a little (usually 1 to 2 cm) and the bobbin is rotated about once. As a result, the thread becomes wrapped around the cutting tool 8b. This situation is shown in Figure 4b. Therefore, in FIG. 4b, the fitting location 2ab is eliminated and the bobbin 2
A is held up against the spindle 2b.

At this point, raise the bobbin to its original height and then remove the cutting tool 8.
When b is pulled, the tail thread is easily cut because it is fixed between point X at the lower end of the spindle and point y pressed by thread presser 8C. Furthermore, since the tail thread is fixed between x and y, the length of the tail thread after cutting can be shortened.

This completes the tail thread processing, and the bobbin is moved to the full pirn processing location by the vertical movement shown in FIGS.

EFFECT OF THE INVENTION By rotating the chuck that grips the bobbin,
In order to release the fit between the spindle and bobbin, in the past, a force of 10 kg or more, I:, was required to remove a fully wound pirn, but with the present invention, a force of about 1 kg, which is 1/10, is required. This allows you to make a list of the items you want to extract, and this allows you to perform dotting without making mistakes.

In addition, the length of the tail thread can be shortened, which has the effect of reducing spindle winding loss and eliminating trouble in the next winding operation.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the overall outline of the automatic doffing device of the present invention. 2 is a partially sectional side view showing the chuck portion of FIG. 1. FIG. FIG. 3 is a sectional view showing the shape of the chuck body. FIGS. 4a and 4b are side views centered on the bobbin, partially including a cross section and a perspective view, for explaining the tail thread processing. The explanation of the numeral 1: in the figure is as follows. l-spinning frame la-tail thread 2a-bobbin 2b-spindle 2cm pirn 3-automatic doffing device 4-working arm 4a-chuck 7-rotating cylinder 8a-brake presser 8b-1, l) cutting tool 8C-system Presser foot 10 - chuck body or more

Claims (1)

[Claims] This automatic doffing device is equipped with a mechanism that grips the bobbin head of a fully wound pirn of a spinning machine or the like by expanding and contracting an elastic material, and a mechanism that allows the bobbin to be slightly rotated and moved up and down while being gripped.