JPH105471A - Needle bar support body of zigzag sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce weight of a needle bar support body, reduce vibration of a sewing machine, and facilitate manufacture by integrally forming the needle bar support body by bending respective parts by sheet metal. SOLUTION: A needle bar support body 3 of a zigzag sewing machine is fitted/installed by a hole part 4 to/on a support shaft supported by a sewing machine frame, and swingably supports a plate-like main body, and two places are bent from its part, and are raised up in a U shape, and are formed as a pair of rising parts. Through holes 7 and 8 orthogonal to the shaft direction of the hole part 4 are arranged in the rising parts, and are formed as needle bar support parts 5 and 6, and a small shaft 12 is implanted in a proper position of a main body so as to be fitted to and installed in a long hole 14 bored on the other end of an amplitude rod 13 whose one end is connected to a zigzag generating mechanism. A part of the main body is raised up by being bent in the direction orthogonal to the through holes 7 and 8, and an installing part 16 oppositely coming into contact with the other end surface of the amplitude rod 13 is integrally formed. Therefore, the needle bar support body 3 can be integrally formed of sheet metal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a needle bar support for a zigzag sewing machine.

[0002]

2. Description of the Related Art A needle bar support of a zigzag sewing machine supports a needle bar in a vertically movable manner to form a zigzag stitch. The support itself must be swingably mounted on the machine frame to move the needle bar left and right. To convert the operation from the zigzag generating mechanism to left and right movement. In addition, a configuration that enables adjustment of the needle drop position is required. Of these, the direction of vertical movement of the needle bar is different from the direction of left / right movement of the needle bar, so that a three-dimensional configuration is required. For this reason, a needle bar support that has been widely used in zigzag sewing machines has conventionally been made of cast iron or die cast, and has achieved a three-dimensional structure.

[0003]

In such a three-dimensional structure made of cast iron or aluminum die cast, the weight of cast iron increases, which causes vibration of the sewing machine. Required the production of expensive aluminum die-casting molds and subsequent machining.

In view of such a situation, the applicant of the present invention has disclosed in Japanese Utility Model Laid-Open No. 50-71148 a hole 20 at the upper end, which becomes a swing center, and a collar member 23 for pivotally mounting an amplitude rod below. Is manufactured by sheet metal and the collar member is press-fitted. A proposal has been made in which a pair of bearing portions 22 for supporting the needle bar are made of a sintered oil-impregnated alloy or a synthetic resin containing glass fiber and are fixed so as to support an axial direction perpendicular to the plate-like portion of the sheet metal (FIG. 6). reference).

[0005] The main body can be made of sheet metal. Press-fitting the collar member reduced the overall weight and facilitated fabrication.

However, when the bearing portion for supporting the needle bar is made of a sintered oil-impregnated alloy, it must be fixed to the main body by brazing, and in the case of a synthetic resin, an outsert operation is required when forming the bearing. There is a problem that it takes a long time to manufacture because different materials are used partially.

According to the present invention, a needle bar support for a zigzag sewing machine is manufactured from a sheet metal, and a needle bar having an integral plate-like body is solved by supporting vertical movement of the needle bar, connecting to an amplitude rod, adjusting needle drop, and the like. It is an object of the invention to provide a support.

[0008] The positioning and adjustment of the needle bar support with respect to the amplitude rod is performed by adjusting the tip of the push screw screw-fitted to the needle bar support to the end face of the amplitude rod by pushing the push screw. In order to prevent the screw from being loosened, a conventional nut is used to form a double nut together with the threaded portion of the needle bar support.

For this reason, in order to adjust the position after assembling, the nut is loosened, the push screw is adjusted, and the nut is tightened again. Therefore, the adjustment is complicated, and the push screw also moves when the nut is tightened. It is another object of the invention to solve this problem and to provide a needle bar support that can be easily adjusted.

[0010]

According to the present invention, a support portion on which a needle bar is vertically movably fitted is horizontally bent at two upper and lower positions.
A pair of through-holes are drilled in the horizontal part, and a hole for fixing a small shaft that movably fits a connection part with the amplitude rod into a long hole drilled in the amplitude rod is provided at an appropriate position on the side part. Further, an attaching portion for mounting an adjusting element having an abutting surface to an end surface formed at one end of the amplitude rod is integrally formed by a plate-like member provided by being bent in parallel to the through hole for supporting the needle bar. To configure. The problem was solved by adopting a double lock configuration using a push screw and an adjustable lock nut for the adjustment element.

[0011]

According to the present invention, the needle shaft is swingably supported by a supporting shaft fitted into a hole formed at the upper end of the sewing machine body, and the needle bar is vertically fitted and supported by a pair of through holes. The vertical direction of the amplitude rod is supported by a small shaft fitted in a long hole formed at one end of the amplitude rod at an appropriate position, and the appropriate position is bent in parallel with the needle bar support direction, and the amplitude is used as a mounting portion. The movement from the zigzag generating mechanism is converted into the left and right movement of the needle bar by being attached to the end face formed at one end of the rod. Also, by providing a mounting portion for mounting the adjustment element on the mounting portion, the needle drop position can be adjusted,
The vibration of the sewing machine can be reduced and the needle bar support of the sewing machine can be easily manufactured.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of an embodiment of the present invention will be described below with reference to FIGS.

A mechanism base 1 is integrally fixed to a part of a machine frame (not shown) of the zigzag sewing machine. A support shaft 2 is fixed to the mechanism base 1 in a direction perpendicular to the vertical direction of the needle bar.

Reference numeral 3 denotes a needle bar support of the present invention, which is made of a plate-shaped main body, here, a sheet metal which is easy to manufacture. At the upper end of the main body, a hole 4 to be fitted in the support shaft 2 is formed, and the needle bar support 3 is swingably pivoted about the support shaft 2 as a fulcrum.

A pair of horizontal needle bar supports 5 and 6 are formed at two appropriate positions on the needle bar support 3 by being bent at right angles in a direction coinciding with the axial direction of the hole 4 and standing up.

The pair of needle bar support portions 5 and 6 are provided with through holes 7 and 8 penetrating in a single axis perpendicular to the axial direction of the hole portion 3, respectively. It is fitted and supported so as to be slidable in the directions.

The needle bar is fixed to the needle bar doki 10 at an appropriate position. The needle bar dok is connected to a known drive mechanism of the sewing machine and is connected via a drive shaft supported by the sewing machine frame and other needle bar cranks (none of which is shown). Moves the needle bar 9 up and down.

A hole 11 is provided at an appropriate position on the main body of the needle bar support 3.
And the small shaft 12 is fixed to the hole.

The small axis has a zigzag generating mechanism (not shown).
Slot 1 provided at the other end of the amplitude rod 13 connecting one end to
4 is fitted so as to be movable in the swinging direction, and the fitted state is maintained by a retaining ring 15 attached to the small shaft.

At an appropriate position of the needle bar support 3, there is provided an adjusting element mounting portion 16 which is bent and raised at a right angle to the needle bar support portions 5, 6, and a screw hole is provided in the mounting portion. A screw 17 is mounted in the screw hole, and the tip is arranged at a position where it comes into contact with the end surface 13a of the amplitude rod 13, and always comes into contact with the action of a spring member (not shown) to form a zigzag generating mechanism. The swinging position of the needle bar support 3 with respect to.

Therefore, the zigzag movement generated by the zigzag generator in conjunction with the rotation of the drive shaft is not affected by the amplitude rod 13.
To the needle bar support 3 to continuously oscillate the needle bar 9.

Numeral 18 denotes an adjustable lock nut, as shown in detail in FIG. 3, which is formed of a thin plate having a spring property and comprises a screw hole and an outer frame. Combine and adjust element mounting part 1 at outer frame
6 abuts.

The repulsive force between the screw 17 and the adjusting element mounting portion 16 prevents the screw 17 from loosening.

Further, a forward and backward movement by rotation of the screw 17 against the repulsive force is allowed, and a constant repulsive force is maintained. The swinging position of the needle bar support 3 with respect to the amplitude rod 13 can be adjusted by moving the tip forward and backward by the rotation of the screw 17. The adjusting element 19 is composed of the screw 17 and the adjustable lock nut 18.

One embodiment of the present invention has a structure as described above. The needle bar support 3 is formed by punching a sheet metal and bending the needle bar support portions 5 and 6 and the adjusting element mounting portion 16 at right angles.
Since each of the plurality of holes is formed by being drilled at the time of molding, the production can be performed in a short time and easily.

Next, the function of the present invention will be described. The needle bar 9 is provided with two through-holes 7 in horizontal needle bar supports 5 and 6 provided in the needle bar support 3 as the drive shaft rotates. In addition, the zigzag generator mounted in the sewing machine frame makes the rocking movement via the amplitude rod 13 and the needle bar support 3 in synchronization with the vertical movement while being guided by 8.

At the lower end of the needle bar 9, a sewing needle is mounted. When the needle bar 9 moves downward, the needle bar 9 is passed through the sewing needle in cooperation with a thread catching device provided in the lower sewing machine frame. The seam can be constituted by the thread and the lower thread in the yarn catching device.

The stitch cannot be formed unless the needle drop position is appropriate for the thread catcher. In addition, in order to set a predetermined needle drop position, adjustment of the horizontal (left and right) direction of the needle is performed by the needle. The adjustment is performed by rotating the screw 17 of the adjustment element 19 attached to the adjustment element mounting portion 16 formed by bending the rod support 3 in a part thereof and moving forward and backward.

In this embodiment, the vertical movement of the needle bar 9 is supported by the pair of through holes 7 and 8. However, in the second embodiment, the sliding state with the needle bar is further improved as shown in FIG. As shown in FIG. 4, it is also effective to form at least one of the through holes large and insert the bearing member.

Since the bearing member in this case is intended to prevent metallic contact with the needle bar, the bearing member with a rib on the outer periphery as shown in FIG. Is press-fitted by molding of resin or the like.

It is also effective to provide a shape with an axial slit for facilitating press-fitting.

[0032]

The structure and operation of the present invention are as described above. For a needle bar support requiring a three-dimensional configuration, each part is bent and integrally formed, so that the needle bar support is integrated with a sheet metal. It is possible to reduce the weight of the needle bar support because it can be formed in a flexible manner, and it is possible to reduce the vibration of the sewing machine and to press the needle bar support, thereby facilitating production. The practical and manufacturing effects are remarkable. Further, by using a screw and an adjustable lock nut fitted to the screw as the adjustment element, the screw can be prevented from loosening, and the needle drop position can be easily adjusted after assembling.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part showing a state where the present invention is mounted,

FIG. 2 is a side view of a main part showing a state where the present invention is mounted;

FIG. 3 is a sectional view taken along line AA in FIG. 2;

FIG. 4 is a structural explanatory view of a bearing portion of a second embodiment,

FIG. 5 is an explanatory view of a bearing member,

FIG. 6 is a perspective view of a conventional example.

[Explanation of symbols]

 2 ... Support shaft 3 ... Needle bar support 4 ... Hole 5,6 ... Needle bar support 7,8 ... Through hole 9 ... Needle bar 10 ... Needle bar dowel 11 ... Hole 12 ... Small axis 13 ... Amplitude rod 14 ... Slot 16: Adjustment element mounting part 19: Adjustment element

Claims (3)

[Claims] 1. A zigzag for transmitting an operation of a zigzag generating mechanism as a lateral movement of a needle bar by swinging a support shaft as a fulcrum with respect to a lateral movement of an amplitude rod and supporting a needle bar in a through hole so as to be vertically movable. A needle bar support of a sewing machine, a plate-shaped main body which is fitted to a support shaft supported by a sewing machine frame with a hole and is swingably supported, and two portions are bent from a part of the main body. A needle bar support having a pair of raised portions raised in a U-shape and a through-hole provided in the raised portion in a direction perpendicular to the axial direction of the hole, and one end of a zigzag generating mechanism; A small shaft implanted at an appropriate position of the main body so as to fit into a long hole formed at the other end of the connected amplitude rod, and a part of the main body is bent in a direction orthogonal to the through hole to stand. The amplitude rod is integrally formed with a mounting portion for abutting against the other end face of the amplitude rod. Needle bar support zigzag sewing machine, characterized in that. 2. The apparatus according to claim 1, wherein an adjusting element for adjusting a contact state with the other end surface of the amplitude rod is mounted on the mounting portion, so that a needle drop position by the needle bar can be adjusted. Item 7. A needle bar support of the zigzag sewing machine according to Item 1. 3. A needle for a zigzag sewing machine according to claim 1, wherein a bearing member is provided for supporting the needle bar by being fitted into at least one of the through holes. Rod support.