JPH0679080A - Shuttle race body for sewing machine with half-turn shuttle - Google Patents

Abstract

PURPOSE:To provide a shuttle race body of reduced production processes and low cost, easy to install in a conventional machine casing bed. CONSTITUTION:A metallic bearing part 1 which holds a drive shaft rotatably with a little clearance of fitting, and smoothly transmits a rotational motion of a lower shaft to the driver shaft is inserted and integrated into a resin body part 2, which guides a sliding motion of a shuttle body, upon its injection molding. At this time, a chuck is provided for an end part 1a, which comes into contact with the resin body part 2, to strengthen the integration into the resin body part 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a semi-rotary hook sewing machine large hook.

[0002]

2. Description of the Related Art Conventionally, the large rotary hook of a semi-rotary rotary sewing machine has a reamer, a reamer, and a punched metal material made of cast iron.
It was manufactured by machining such as turning, milling, and screw hole processing. However, under the above technique, it is difficult to keep the manufacturing cost low because the number of processing steps increases. Therefore, as disclosed in Japanese Utility Model Laid-Open No. 1-99380, a driver shaft is fixedly mounted on a machine frame bed, and a driver is rotatably mounted on the shaft. The resin cauldron is a machine frame bed around the driver shaft. A resin cauldron device having a mounting portion orthogonal to the axis has been proposed.

[0003]

However, according to the technique disclosed in the above publication, it is necessary to drastically change the hook driving mechanism of the sewing machine when the large hook is mounted on the machine frame bed.

The present invention has been made in order to solve the above-mentioned problems, and an object thereof is to provide a cauldron which has a small number of manufacturing steps, is inexpensive, and can be easily mounted on a conventional machine frame bed.

[0005]

To achieve this object, a cauldron according to the present invention comprises a metal bearing portion for rotatably holding a driver shaft and a resin main body for guiding the sliding movement of an inner pot. And a means for integrally fixing the resin main body and the metal bearing.

[0006]

The metal bearing portion for a driver shaft according to the present invention having the above-described structure enables the driver shaft to rotate and keeps a small fitting clearance, and allows the lower shaft to rotate smoothly on the driver shaft. Make it communicate. The resin main body guides the sliding movement of the inner hook. The fixing means integrally fixes the bearing portion and the resin main body portion. As a result, it is possible to obtain a cauldron having a small number of manufacturing steps, which is inexpensive, and which can be easily mounted on the conventional machine frame bed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, the bearing portion 1 is formed by turning a metal material, for example, a brass material, or by a sintering method, so that the driver shaft can rotate and the fitting clearance is kept small. A knurl is provided on the end portion 1a that is in contact with the resin main body 2 in order to strengthen the integration with the resin main body 2. The resin main body 2 for guiding the sliding movement of the inner pot is formed by injection molding a resin material. At this time, the bearing 1 is inserted and integrally molded. The metal bearing 1 and the resin main body 2 may be integrated by welding, bonding, or by providing a screw hole in the metal bearing 1 and screwing the resin main body.

[0008]

As is apparent from the above description, according to the cauldron of the present invention, since the main body portion having a complicated shape is formed by resin molding, the man-hours for processing can be reduced and the cost can be reduced. In addition, since the bearing portion for the driver shaft is made of metal, the driver shaft can be rotated and the fitting play can be kept small, and the rotational movement of the lower shaft can be smoothly transmitted to the driver shaft. . In addition, since the resin main body and the metal bearing are integrated, it can be easily installed in the conventional machine frame bed without a large change in the shuttle drive mechanism.

[Brief description of drawings]

FIG. 1 is a front view of a cauldron showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

[Explanation of symbols]

 1 Bearing part 1a End part 2 Body part

Claims (1)

[Claims] 1. In a semi-rotary hook sewing machine, a metal bearing portion that rotatably holds a driver shaft, a resin main body portion that guides the sliding movement of the inner hook, the resin main body portion, and A cauldron consisting of means for integrally fixing the metal bearing part.