JPH05293280A - Shuttle device with thread dust discharging mechanism - Google Patents

Abstract

PURPOSE:To discharge the thread dust accumulated on the shuttle guide face of a shuttle main body by injecting air from an injection hole formed on the shuttle guide face of the shuttle main body. CONSTITUTION:A connecting hole, a circumference hole, and an injection hole 30 are provided to be communicated from the outer wall of a shuttle main body 10 to a shuttle guide face 14, and air is injected to the shuttle guide face 14 by an air pressure pump32, a pressure adjusting device 34, a solenoid valve 36, and a flow adjusting valve 38 to discharge the accumulated thread dust.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a half-turn hook device for a sewing machine.

[0002]

2. Description of the Related Art Conventionally, as a half-turn hook device in a sewing machine, in a middle hook guided by a hook main body and a large hook, there is a hook device in which an outer diameter surface of the middle hook rotates along a hook guide surface of the hook main body. is there.

[0003]

However, in the former device, when the inner hook is set in the hook main body, the outer diameter surface of the inner hook is entirely on the hook guide surface of the hook main body due to the structure of the half-turn hook. Since there is no circumferential contact, a non-contact surface is created on the outer diameter surface of the inner hook and the hook guide surface of the hook main body, and the thread dust entering from the non-contact surface during the rotation of the inner hook causes the abrasive to function. Then, the outer diameter surface of the inner hook and the hook guide surface of the hook main body were worn, resulting in backlash between the hook main body and the inner hook, resulting in noise and stitching problems such as skipped stitches.

The present invention has been made to solve the above-mentioned problems, and air is ejected from a vent hole formed in the hook guide surface of the hook main body, so that the hook guide surface of the hook main body and the inner hook are separated. It is characterized by discharging thread dust accumulated between the outer diameter surface of the hook, which causes wear on the outer diameter surface of the hook of the inner hook and the hook guide surface of the hook main body, and noise and rattling caused by the backlash caused by the wear. An object of the present invention is to provide a hook device with a thread dust discharging mechanism, which solves the problem of sewing such as jumping.

[0005]

In order to achieve this object, a hook device with a thread dust discharging mechanism according to the present invention is provided with a vent hole provided so as to communicate from the outer wall of the hook body to the hook guide surface, and the vent hole. Air jetting means for jetting air through the shuttle guide surface is provided.

[0006]

In the hook device with a thread dust discharging mechanism of the present invention having the above-mentioned structure, the air generated by the air ejecting means for ejecting air is provided so as to pass from the outer wall of the hook main body to the hook guide surface. Air is blown from the ventilation hole formed in the shuttle guide surface through the ventilation hole, and the yarn dust accumulated between the shuttle guide surface of the shuttle main body and the outside diameter surface of the shuttle hook is discharged.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall block diagram of a hook device with a thread dust discharging function embodying the present invention, and FIG. 2 is a sectional explanatory view showing an internal structure of a hook main body 10.

A hook guide surface 14 for slidably supporting the inner hook 12 is provided on the hook main body 10 attached to the main body of the sewing machine, centering on the lower shaft of the sewing machine. A driver 16 for swinging the inner hook 12 is provided so as to be driven along the hook guide surface 14.

Further, a large hook 18 for supporting the inner hook 12 so that the inner hook 12 does not jump out of the inner hook body 10 is attached to the hook main body 10. The bobbin 20 and the bobbin case 22 are housed in the inner hook 12.

Next, as shown in FIG. 2, the hook main body 10 is provided therein with a circumferential hole 24 extending in the circumferential direction, and at both ends thereof, a connecting hole 28 for connecting with an air pipe 26 described later. Extends toward the outer wall of the shuttle body 10. Further, eight ejection holes 30 are provided at approximately equal intervals so as to communicate from the circumferential hole 24 to the shuttle guide surface 14. Therefore, the circumferential hole 24, the connecting hole 28, and the ejection hole 30 form a ventilation hole.

Further, an air pressure pump 32 for ejecting air from the ejection hole 30 to the shuttle guide surface 14 is provided. A pressure adjusting device 34 for adjusting the pressure of air is connected to the air pressure pump 32, and a solenoid valve 36 for controlling the air to be ejected is connected to the pressure adjusting device 34.
A flow rate adjusting valve 38 for adjusting the flow rate of air is connected to the electromagnetic valve 36, and the flow rate adjusting valve 38 is connected to the connecting hole 28 of the shuttle main body 10 through the air pipe 26. Therefore, the pneumatic pump 32, the pressure adjusting device 34, the solenoid valve 36
The flow rate adjusting valve 38 and the flow rate adjusting valve 38 constitute air jetting means.

Next, the operation of the hook device with the yarn dust discharging function of this embodiment will be described.

First, the air compressed by the air pressure pump 32 is supplied to the pressure adjusting device 34, and the inner hook 1 is sewn during sewing.
The pressure adjusting device 34 regulates the air so that the air does not affect the loop of the thread when the tip of the second blade scoops the loop of the thread. Then, the electromagnetic valve 36 controls the ejection of air, and the flow rate adjusting valve 38 sets the air to a flow rate sufficient to discharge the yarn dust between the shuttle guide surface 14 of the shuttle main body 10 and the shuttle outer diameter surface of the inner shuttle 12. After adjusting, air is jetted through the air pipe 26 through the connecting hole 28, the circumferential hole 24, and the jet hole 30 which are provided so as to communicate from the outer wall of the shuttle body 10 to the shuttle guide surface 14, and the air of the shuttle body 10 is removed. The yarn dust accumulated between the guide surface 14 and the outer diameter surface of the inner hook 12 is discharged.

[0015]

As is apparent from the above description, the hook device with a thread dust discharging function of the present invention ejects air from the vent hole formed in the hook guide surface of the hook main body, and guides the hook guide of the hook main body. By discharging the thread dust accumulated between the surface and the outer diameter surface of the inner hook of the inner hook, the outer diameter surface of the inner hook of the inner hook and the hook guide surface of the hook main body are prevented from being worn by the thread dust, and the wear causes backlash. The problem of sewing such as noise and skipped stitches can be solved.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a hook device with a yarn dust discharging function of the present invention.

FIG. 2 is a cross-sectional explanatory view showing an internal configuration of a shuttle body of the shuttle device.

[Explanation of symbols]

 10 hook main body 12 middle hook 18 large hook 24 circumferential hole 26 air piping 28 connecting hole 30 jet hole 32 pneumatic pump 34 pressure adjusting device 36 solenoid valve 38 flow rate adjusting valve

Claims (2)

[Claims] 1. A half-rotating hook device comprising a hook main body having a hook guide surface for rotatably guiding an inner hook and a large hook, and a ventilation provided so as to communicate from an outer wall of the hook main body to the hook guide surface. A hole and an air ejecting means for ejecting air to the shuttle guide surface through the ventilation hole are provided, and by the jetted air, the yarn dust accumulated between the inner shuttle and the shuttle body is discharged. A hook device with a featured thread dust discharge mechanism. 2. A thread dust provided with a groove provided on a hook guide surface of the hook main body, and a ventilation hole provided so as to communicate from an outer wall of the hook main body to a groove on the hook guide surface. A hook device with a discharge mechanism.