JPH1033874A - Sewing machine provided with supporting curved body for driving motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mount a driving motor with less vibration in a protected state in a sewing machine provided with a casing provided with a substrate and the driving motor fixed to the casing for which the shaft of the driving motor is drive-connected to a main shaft mounted to the substrate through a clutch. SOLUTION: The driving motor 12 is fixed to an U-shaped supporting curved body 19 bridged in a space part and fixed and connected to the substrate 1 inside the space part of the substrate 1. Also, the fixed positions 20 and 21 of the driving motor 12 in the supporting curved body 19 are roughly positioned on the plane E of the centroid S of the driving motor 12 horizontally extended to a driving motor shaft 23 or a range extended in the direction of the opposite end part of the driving motor 12 from the centroid S to the clutch 8. Thus, the above purpose is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a casing having a substrate and a drive motor fixed to the casing, and a shaft of the drive motor is drivingly connected to a main shaft mounted on the substrate via a clutch. About the sewing machine.

[0002]

2. Description of the Related Art In a sewing machine known from U.S. Pat. No. 2,223,315 having a casing consisting of a board, a column and an arm, a main shaft mounted on the board is connected to a shaft of a drive motor via a clutch. Have been. The drive motor is fixed to a column of the machine casing via a bent support screwed to the side of the motor casing.
In this case, the motor extends at a distance to the side of the substrate, so that, on the one hand, there is a danger that the support will be bent by the action of the impact force, thus impairing the correct orientation of the motor, on the other hand Since the suspension of the motor during the operation of the sewing machine is unstable, the motor vibrates due to a slight imbalance of the motor, which is transmitted to the sewing machine, which is extremely inconvenient.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to mount a drive motor in a protected state with low vibration.

[0004]

According to the present invention, there is provided an electronic apparatus comprising:
That is, the drive motor is fixed to the U-shaped support curved body which bridges the space in the space of the substrate and is fixedly connected to the substrate, and the drive motor in the support curved body Is fixed in the plane of the center of gravity of the drive motor, which extends substantially transverse to the drive motor axis, or in a range extending from the center of gravity to the clutch in the direction of the opposite end of the drive motor.

[0005]

By accommodating the motor in the space of the substrate, the motor is protected like a built-in motor, whereby the motor is significantly protected against shocks and other obstacles. Another way to secure the motor to the motor mount within its center of gravity or at a position opposite the center of gravity as viewed from the clutch is to assure stable mounting of the motor, thereby producing vibration and its sewing machine. Transmission to the user. Lastly, the U-shaped supporting curved body bridging the space of the substrate performs the function of stabilizing or reinforcing the substrate weakened by the space. further,
Since the support curve engages the motor below, it forms a motor protection acting from below and at the same time serves as a standing leg of the sewing machine or as a covering plate abutment for closing the substrate from below.

[0006] By means of claim 2 in which the support curve is an integral part of the substrate, it is not necessary to manufacture the support curve as a separate auxiliary component and screw it to the substrate. Furthermore, with regard to the weakening of the shape rigidity of the substrate caused by the space, one of the walls of the substrate is narrow and long and therefore unstable, especially due to the asymmetry of the installation of the motor and thus of the position of the space. There are special casting techniques when forming webs. When the substrate is cast together with the manufactured supporting curved body, the above-mentioned wall web can be cast without delay, so that a later adjustment operation can be omitted. Furthermore, there is no danger of the web breaking or breaking after casting. Lastly, there is also a feature in the manufacturing technology that it is not necessary to particularly support the wall web during cutting.

In one embodiment, the bearing stand remote from the clutch is configured to form at least one protrusion for fixing the motor to the supporting curved body. The fact that the point supports form a particularly trouble-free fixation of the motor shows another advantageous configuration of the motor mounting.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. The casing of the sewing machine includes a substrate 1, a support 2, and an arm 3 that moves to a head 4. The main shaft 5 of the sewing machine is arranged on the substrate 1. The main shaft 5 is fixed at one end to the boss 6 of the first clutch part 7 of the clutch 8. The clutch part 7 has a toothed belt wheel 9 on the outside.
Is configured as The toothed belt wheel 9 includes the arm shaft 1
This is a structural part of the toothed belt drive unit 11 for driving the drive unit 0.

A motor 13 serves to drive the sewing machine, and a casing 13 thereof includes a front bearing stand 14, a rear bearing stand 15 and an intermediate portion 16. On the rear bearing stand 15 a positioner, which is well known and therefore not shown in detail, is provided below the cover cap 17 integrally with the motor 12. A projection 18 is formed at the rear end of the rear bearing stand 15. The motor 12 allows the U-shaped support curved body 1
9, two fixed positions 20, 21 which are spaced apart from one another. The motor 12 is mounted on the substrate 1
Is located in the space 22.

The second clutch part 2 of the clutch 8
4 is fixed to the motor shaft 23. The two clutch parts 7, 24 are form-lockingly engaged with one another, in which case the clutch part 7 attached to the main shaft 5 is configured like an internal gear ring, and the clutch part 24 attached to the motor shaft 23 has external teeth. It is configured like a ring. The clutch part 24 is injection-moulded around with thermoplastic polyurethane, thereby forming an envelope 25 surrounding the clutch element in a jacket-like manner and filling the intermediate space between the clutch elements of the two clutch parts 7,24.

The boss 6 of the clutch part 7 partially projects on the end of the main shaft 5. The motor shaft 23 protrudes beyond the clutch portion 24 and fits into the boss 6.
The motor shaft 23 is radially supported by the boss 6 via an O-ring 26 disposed at an end thereof.

The supporting curved body 19 is an integral component of the substrate 1 manufactured by casting. The support flexure 19 bridges the space 22 and connects the web wall 27 of the relatively thin substrate 1 with the other part of the substrate 1 adjacent to the space 22 (FIG. 3). In this case, the support curved body 19 covers the lower part of the motor 12, and forms the standing point of the sewing machine with its horizontal lower side. The sewing machine has another two standing points 29, 30 arranged at the other end of the substrate 1. When a covering plate for closing the lower part of the substrate 1 is provided, the standing points 29 and 30 and the supporting curved body 19 serve as a support for the covering plate.

As shown in FIG. 4, the fixed positions 20 and 21 of the motor 12 on the support curved body 19 are located in a range extending from the center of gravity S of the motor 12 toward the end of the motor 12 opposite to the clutch 8. . In other words, the center of gravity S of the motor 12 is defined by the two fixed positions 20 and 21 on the one hand and the O-ring 26 of the motor shaft 23 with respect to the main shaft 5 on the other hand.
And between the supporting points. In this way, stable three-point support mounting of the motor 12 is achieved, thereby preventing vibration of the motor 12 which causes instability.

[Brief description of the drawings]

FIG. 1 is a front view showing a cross section of a part of a sewing machine according to the present invention.

FIG. 2 is a side view of a lower portion of the sewing machine and a mounted motor.

FIG. 3 is a bottom view of a mechanical board.

FIG. 4 is a sectional view of a motor mounting portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 5 Main shaft 8 Clutch 12 Motor 13 Casing 14, 15 Bearing base 19 Supporting curved body 20, 21 Fixed position 22 Space 23 Motor shaft 26 O-ring E Plane S Center of gravity

Claims (3)

[Claims] 1. A sewing machine having a casing having a substrate and a drive motor fixed to the casing, wherein a shaft of the drive motor is drivingly connected to a main shaft mounted on the substrate via a clutch. 12) Substrate (1)
The space (22) is fixed to a U-shaped support curve (19) which is bridged to the substrate (1) by bridging the space (22), and the support curve (19) The fixed position (20, 21) of the drive motor (12) in the plane (E) of the center of gravity (S) of the drive motor (12) extending approximately transversely to the drive motor axis (23), or the center of gravity ( Drive motor (12) from S) to clutch (8)
A sewing machine located in a range extending in the direction of the opposite end of the sewing machine. 2. The sewing machine according to claim 1, wherein the support curve is an integral part of the substrate. 3. A drive motor (12) comprising two bearing blocks (1).
3. The sewing machine according to claim 1, further comprising a casing (13) provided with the clutch (4, 15).
The more remote bearing stand (15) is connected to the motor casing (1).
3) being fixed to the support curve (19) at two mutually spaced positions (20, 21) via at least one protruding part (18), and both fixed positions (20, 21), together with the support (O-ring 26) of the drive motor shaft (23) to the machine spindle (5) performed in the clutch range, as well as the drive motor (12) 3
A sewing machine characterized by forming a point support.