DESC:SEWING MACHINE WITH OIL IMPRIGNATED SINTERED BUSHES”

TECHNICAL FIELD
[0001] The present disclosure, in general, relates to a sewing machine. The present disclosure, in particular, relates to a sewing machine with oil impregnated sintered bushes. The present disclosure further relates to household sewing machine and/or light duty sewing machine for industrial purposes.

BACKGROUND
[0002] A sewing machine is a device used to stitch fabric and other materials together with thread. The sewing machines have household variants and industrial variants. Generally, the household variant of sewing machine differ from the industrial variant of sewing machine in size and material of manufacturing. The sewing machine typically consists of a needle for sewing, a motor (or a hand-operated or foot-operated mechanism) to drive the needle through the material, and various controls and attachments for different types of stitching. The sewing machines can range from simple, manual machines to complex, computerized models with advanced features. The sewing machines are used in various applications, including garment construction, quilting, embroidery, and home sewing projects. There are several types of sewing machines, each designed for specific purposes and sewing techniques.
[0003] In reference to the Figure 1 illustrating a traditional household sewing machine in accordance with the prior art. The sewing machine 100 comprises a base 101, a main housing 102 and an arm shaft 103. The base 101 act as a platform for stitching. The base 101 provides the stability and support to various components, including the motor, mechanism and controls. The base 101 often helps dampen vibrations and reduce noise generated by the sewing machine 100 during operation.
The base 101 and the main housing 102 together make a complete body of the household sewing machine.
[0004] The main housing 102 integrally extends from the base 101 of the sewing machine 100. The main housing 102 has an upright arm 102a and a horizontal arm 102b. The upright arm 102a integrally extends vertically from the rear end of the base 101. The upright arm 102a has a bottom end and a top end. Further, the horizontal arm 102b integrally extends horizontally from the top end of the upright arm 102a, such that, the horizontal arm 102b is parallel to the base 101. The horizontal arm 102b has a front end and a rear end. The horizontal arm 102b is adapted to accommodate the arm shaft 103. The arm shaft 103 has a front end and a rear end. The arm shaft 103 is positioned in the horizontal arm 102b, such that, the front end of the arm shaft 103 is positioned in the front end of the horizontal arm 102b and the rear end of the arm shaft 103 is positioned in the rear end of the horizontal arm 103b. The arm shaft 103 has different configurations for household sewing machine and light duty sewing machine for industrial purposes. In the household sewing machine, the arm shaft 103 has a u-bend near rear end of the arm shaft 103. This u-bend is not required in the light duty sewing machine for industrial purposes as the mechanism and components for rotating the arm shaft are different in household sewing machine and light duty sewing machine for industrial purposes. A bush 104 is provided in the front end of the horizontal arm around the arm shaft 103 to aid in rotation of the arm shaft 103 inside the horizontal arm 102b of the main housing 102.
[0005] The rear end of the horizontal arm 102b is provided with an opening 105 through which the rear end of the arm shaft 103 passes through. In the existing embodiments of the sewing machine 100, the rear end of the arm shaft 103 is in contact with the rear end opening region of the horizontal arm 102b of the main housing 102. In traditional sewing machines, the arm shaft 103 comes into direct contact with the opening region of the horizontal arm 102b. This necessitate constant lubrication. Accordingly, a lubrication channel 106 is provided in this region to apply lubrication. Continuous operation with the arm shaft 103 in direct contact with the opening 105 region of the horizontal arm 102b leads to wear in the contact area of the horizontal arm 102b and the arm shaft 103 causing friction in the body. Due to this, too much starting torque is required for rotating the arm shaft at the initial stage.
[0006] Maintenance is crucial to keep the sewing machine 100 running smoothly and efficiently. One of the major parts of maintenance is oiling/lubricating the sewing machine 100. Oiling the sewing machine is an important maintenance task that helps keep the sewing machine 100 running smoothly and prevents excessive wear and tear on moving parts. This makes oiling of the sewing machine 100 a regular part of the maintenance routine, especially if the sewing machine 100 is being used frequently. How often is the need to oil the machine 100 depends on how much the sewing machine 100 is being used.
[0007] Therefore, sewing machine 100 usually requires time to time oiling of the parts which is a time taking and a hinderance procedure in between the operation.
[0008] Moisture ingress into the sewing machine 100 through the lubrication channel 106 in the arm shaft 103. If the sewing machine 100 is operated in a humid environment, moisture in the air can condense and enter the lubrication channel 106. If the sewing machine 100 is not properly maintained, lubrication oil or grease in the lubrication channel 106 may become contaminated with water or moisture from external sources. This contamination can compromise the effectiveness of the lubricant and lead to corrosion or rusting of internal components. Due to corrosion machine is jammed as ferrous shaft and ferrous body are directly contacted and both catch rust. Thus, presence of lubrication channel 106 in the opening region of the horizontal arm 102b increases the probability of corrosion or rusting in this region. Generally, the main housing 102 and the arm shaft 103 are ferrous in nature. Accordingly, direct contact happens between the ferrous main body 102 and the ferrous arm shaft 103.
[0009] Further, layouts for accommodation of the arm shaft in the horizontal arm 102b of the main housing 102 is provided through machining operation. Accordingly, the layout is machined to accommodate the bush 104 in the front end of the horizontal arm 102b and opening 105 in the rear end. Further, a separate machining operation is performed to machine the lubrication channel 106 in the rear end of the horizontal arm 102b. This makes the assembly and production process time consuming.
[0010] These above-mentioned drawbacks are observed in both household sewing machine and light duty sewing machine for industrial purposes.
[0011] Accordingly, there is a need for a sewing machine that can overcome the above-mentioned drawbacks of the existing household sewing machine and light duty sewing machine for industrial purposes.

OBJECT OF THE INVENTION
[0012] Some of the objects of the present disclosure, which at least one embodiment herein satisfies, are as follows.
[0013] An object of the present disclosure is to ameliorate one or more problems of the prior art or to at least provide a useful alternative.
[0014] Another objective of the present disclosure is to provide a sewing machine equipped with oil impregnated sintered bushes which requires no lubrication in the rear end of the horizontal arm and/or needle bar of the front end of the arm Shaft.
[0015] Yet another objective of the present disclosure is to provide a sewing machine with oil impregnated sintered bushes which minimizes the starting torque requirement.
[0016] Another objective of the present disclosure is to provide a sewing machine with oil impregnated sintered bushes to reduce the time spent on frequent lubrication application.
[0017] Another objective of the present disclosure is to provide a sewing machine with oil impregnated sintered bushes that ensure that the sewing machine is free from corrosion and rust due to the presence of lubrication channel in the rear end of the horizontal arm in contact area.
[0018] Yet another objective of the present disclosure is to provide a sewing machine with oil impregnated sintered bushes which reduces the maintenance requirements.
[0019] Another objective of the present disclosure is to provide a sewing machine with oil impregnated sintered bushes which enhances the efficiency and ease of use.
[0020] Another objective of the present disclosure is to provide a sewing machine with oil impregnated sintered bushes which extend the lifespan and durability of the sewing machine and make the sewing machine smoother to operate.
[0021] Another objective of the present disclosure is to provide a household sewing machine and light duty sewing machine for industrial purposes.
[0022] Yet another objective is to provide a sewing machine with sintered bushes which improves the overall performance and user experience of the sewing machine.

SUMMARY
[0023] This summary is provided to introduce concepts related to sewing machine with oil imprignated sintered bushes. The concepts are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.
[0024] The subject matter relates to a household sewing machine. The household sewing machine comprises a base, a main housing and an arm shaft. The main housing is integrally extended from the base. The main housing has an upright arm and a horizontal arm. The arm shaft is adapted to positioned inside the horizontal arm of the main housing. A first oil impregnated sintered bush and/or a second oil impregnated sintered bush is engaged with the arm shaft to facilitate smooth rotation of the arm shaft. Either of these bushes can be used or both can be used simultaneously. A third oil impregnated sintered bush is accommodated in the needle bar region of the main body.
[0025] In an aspect, bottom end of the upright arm integrally extends vertically from rear end of the base and rear end of the horizontal arm is integrally extended horizontally from the top end of the upright arm making the horizontal arm parallel to the base.
[0026] In an aspect, the first oil impregnated sintered bush is provided in a first bush sitting area of the horizontal arm of the main housing.
[0027] In an aspect, the second oil impregnated sintered bush is provided in a second bush sitting area of the horizontal arm of the main housing.
[0028] In an aspect, the third oil impregnated sintered bush is provided in a third bush sitting area in needle bar region of the horizontal arm of the main housing.
[0029] In an aspect, the first bush sitting area and/or the second bush sitting area and the third bush sitting area in the horizontal arm of the main housing is provided through machining operation to accommodate the first oil impregnated sintered bush, the second oil impregnated sintered bush and the third oil impregnated sintered bush.
[0030] In an aspect, the arm shaft has a u-shaped bend near the rear end of the arm shaft.
[0031] The subject matter further relates to a light duty sewing machine for industrial purpose (second embodiment). The light duty sewing machine comprises a base, a main housing and an arm shaft. The main housing integrally extends from the base. The main housing has an upright arm and a horizontal arm. The arm shaft is adapted to positioned inside the horizontal arm of the main housing. A first oil impregnated sintered bush and a second oil impregnated sintered bush is engaged with the arm shaft to facilitate smooth rotation of the arm shaft. A third oil impregnated sintered bush is accommodated in the needle bar region of the main body.
[0032] In an aspect of second embodiment, bottom end of the upright arm integrally extends vertically from rear end of the base and rear end of the horizontal arm is integrally extended horizontally from the top end of the upright arm making the horizontal arm parallel to the base.
[0033] In an aspect of the second embodiment, the first oil impregnated sintered bush is provided in a first bush sitting area of the horizontal arm of the main housing.
[0034] In an aspect of the second embodiment, the second oil impregnated sintered bush is provided in a second bush sitting area of the horizontal arm of the main housing.
[0035] In an aspect of the second embodiment, the third oil impregnated sintered bush is provided in a third bush sitting area in needle bar region of the horizontal arm of the main housing.
[0036] In an aspect of the second embodiment, the first bush sitting are and/or the second bush sitting area and the third bush sitting area in the horizontal arm of the main housing is provided through machining operation to accommodate the first bush and/or the second bush and the third bush.
[0037] In an aspect of the second embodiment, the arm shaft is straight rod.
[0038] To further understand the characteristics and technical contents of the present subject matter, a description relating thereto will be made with reference to the accompanying drawings. However, the drawings are illustrative only but not used to limit the scope of the present subject matter.
[0039] Various objects, features, aspects, and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like components.

BRIEF DESCRIPTION OF FIGURES
[0040] The illustrated embodiments of the present disclosure will be best understood by reference to the drawings, wherein like parts are designated by like numerals throughout. The following description is intended only by way of example, and simply illustrates certain selected embodiments of the vehicle rear side body structure that are consistent with the subject matter as claimed herein, wherein:
[0041] FIG. 1 illustrates a traditional household sewing machine in accordance with the prior art;
[0042] FIG. 2 illustrates an assembled view of household sewing machine with oil impregnated sintered bushes that can be utilized to implement one or more exemplary embodiments of the present disclosure;
[0043] FIG. 3 illustrates an exemplary household sewing machine outer structure that can be utilized to implement one or more exemplary embodiments of the present disclosure;
[0044] FIG. 4 illustrates an exemplary arm shaft with oil impregnated sintered bush that can be utilized to implement one or more exemplary embodiments of the present disclosure;
[0045] FIG. 5 illustrates an assembled view of light duty sewing machine for industrial purposes with oil impregnated sintered bushes that can be utilized to implement one or more exemplary embodiments of the present disclosure;
[0046] FIG. 6 illustrates an exemplary light duty Industrial sewing machine outer structure that can be utilized to implement one or more exemplary embodiments of the present disclosure; and
[0047] FIG. 7 illustrates an exemplary arm shaft with oil impregnated sintered bushes that can be utilized to implement one or more exemplary embodiments of the present disclosure.
[0048] The figures depict embodiments of the present subject matter for the purposes of illustration only. A person skilled in the art will easily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.

DETAILED DESCRIPTION
[0049] A few aspects of the present disclosure are explained in detail below with reference to the various figures. Example implementations are described to illustrate the disclosed subject matter, not to limit its scope, which is defined by the claims. Those of ordinary skill in the art will recognize a number of equivalent variations of the various features provided in the description that follows.
Definitions
[0050] In the disclosure hereinafter, one or more terms are used to describe various aspects of the present disclosure. For a better understanding of the present disclosure, a few definitions are provided herein for better understanding of the present disclosure.
[0051] “Main Housing” may be defined, in the context of the disclosure, as the machine body or casing that encloses and protects internal components, such as the motor, gears, and electrical components, and mechanisms of the sewing machine. The main housing is usually made from durable materials such as metal or high-quality plastic to ensure longevity and resilience under frequent use.
[0052] “Base” may be defined, in the context of the disclosure, as bottom part that provides a stable platform for the main housing to sit on. The base ensures that the sewing machine remains stable and does not tip over during operation. It is typically designed to be flat and sturdy to support the weight and movements of the machine. The base often includes a flat, smooth surface called the bed or sewing platform, where the fabric rests and moves smoothly as it is being sewn.
[0053] “Arm Shaft” may be defined, in the context of the disclosure, as the component that transfers motion from motor to various parts of the sewing machine, enabling the sewing process. The arm shaft helps in driving needle of the sewing machine up and down through the fabric. The precise motion of the arm shaft ensures consistent stitching and prevents needle breakage or skipped stitches. The arm shaft in a sewing machine is typically made of durable metal, such as steel or hardened MS.

EXEMPLARY EMBODIMENTS
[0054] While the present disclosure may be embodied in various forms, there are shown in the drawings, and will hereinafter be described, some exemplary and non-limiting embodiments, with the understanding that the present disclosure is to be considered an exemplification of the invention and is not intended to limit the invention to the specific embodiments illustrated. Not all of the depicted components described in this disclosure may be required, however, and some implementations may include additional, different, or fewer components from those expressly described in this disclosure. Variations in the arrangement and type of the components may be made without departing from the scope of the claims as set forth herein.
[0055] Embodiments, of the present disclosure, will now be described with reference to the accompanying drawings.
[0056] Embodiments are provided so as to thoroughly and fully convey the scope of the present disclosure to the person skilled in the art. Numerous details are set forth, relating to specific components, and methods, to provide a complete understanding of embodiments of the present disclosure. It will be apparent to the person skilled in the art that the details provided in the embodiments should not be construed to limit the scope of the present disclosure.
[0057] The terminology used, in the present disclosure, is only for the purpose of explaining a particular embodiment and such terminology shall not be considered to limit the scope of the present disclosure. As used in the present disclosure, the forms "a,” "an," and "the" may be intended to include the plural forms as well, unless the context clearly suggests otherwise. The terms "comprises," "comprising," “including,” and “having,” are open-ended transitional phrases and therefore specify the presence of stated features, integers, steps, operations, elements, modules, units and/or components, but do not forbid the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The particular order of steps disclosed in the method and process of the present disclosure is not to be construed as necessarily requiring their performance as described or illustrated.
[0058] As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed elements.
[0059] Sewing machines generally requires periodic maintenance, such as lubrication, for smooth operation and longevity of sewing machines. There are some potential drawbacks and challenges associated with it which includes:
• Maintenance Frequency: Regular lubrication is required to keep the sewing machine running smoothly. This means users must be diligent about maintenance schedules, which can be time-consuming and easily overlooked.
• Over-Lubrication: Applying too much lubricant can cause it to seep into unwanted areas, potentially leading to stains on fabrics or gumming up the sewing machine's components. Over-lubrication can attract dust and lint, creating a sticky residue that may hinder the sewing machine's performance.
• Mess and Clean-Up: Lubrication can be messy, with the risk of oil dripping onto work surfaces or fabrics. Cleaning up excess lubricant and ensuring it doesn't come into contact with sewing projects can be a hassle.
[0060] Further, to provide lubrication, lubrication channels are created in the sewing machine main body to give access to internal components. These lubrication channels also aid in ingression of moisture of water to the internal component which may result in rusting/corrosion in internal components. Also, machining the lubrication channels on the main housing increases production costs and time of the sewing machine.
[0061] To solve the problems, a sewing machine is required with oil impregnated sintered bushes. The features of the sewing machine with sintered bushes are described in more detail below.
[0062] FIG. 2 illustrates an assembled view of household sewing machine with oil impregnated sintered bushes that can be utilized to implement one or more exemplary embodiments of the present disclosure. The sewing machine 200 comprises a base 201, a main housing 202 and an arm shaft 203. The main housing 202 is adapted to accommodate the arm shaft 203. In an aspect of the first embodiment, the arm shaft 203 has a u-shaped bent. In the assembled state of the sewing machine 200, the arm shaft 203 is parallelly positioned with reference to the base 201. The base 201 is a horizontal platform over which the stitching operation is done.
[0063] FIG. 3 illustrates an exemplary household sewing machine outer structure that can be utilized to implement one or more exemplary embodiments of the present disclosure. The base 201 has a front end 201a and a rear end 201b. The stitching operation is performed over the front end 201a. The main housing 202 integrally extends vertically from the rear end 201b of the base 201. The main housing 202 comprises an upright arm 202a and a horizontal arm 202b. The upright arm 202a has a top end 202aa and a bottom end 202ab. The bottom end 202ab of the upright arm 202a extends integrally vertical from the rear end 201b of the base 201. The horizontal arm 202b has a front end 202ba and a rear end 202bb. The rear end 202bb of the horizontal arm 202b is integrally in connection with the top end 202aa of the upright arm 202a. The horizontal arm 202b runs parallel to the base 201.
[0064] The horizontal arm 202b of the main housing 202 is adapted to accommodate the arm shaft. The arm shaft 203 has a front end 203a and a rear end 203b (Shown in Fig. 4). The front end 203a of the arm shaft 203 is positioned in the front-end region of the horizontal arm 202b and the rear end 203b of the arm shaft 203 is positioned in the rear end region of the horizontal arm 202b. The rear end 203b of the arm shaft 203 passes through the rear end 202bb of the horizontal arm 202b through an opening 204 provided on the rear end 202bb of the horizontal arm 202b.
[0065] In an aspect of the invention, in the horizontal arm 202b, a first bush seating area 301 is provided to accommodate first oil impregnated sintered bush and/or a second bush seating area 302 is provided to accommodate second oil impregnated sintered bush. A third bush seating area 303 is provided at the needle bar area of the horizontal arm 202b of the main housing of the sewing machine 200 to accommodate the third oil impregnated sintered bush.
[0066] To accommodate the first oil impregnated sintered bush and/or the second oil impregnated sintered bush and the third oil impregnated sintered bush in the horizontal arm 202b, the first bush seating area 301 and/or the second bush seating area 302 and the third bush seating area 303 (layouts) are machined in the front-end region and rear end region of the horizontal arm 202b.
[0067] FIG. 4 illustrates an exemplary arm shaft with oil impregnated sintered bush that can be utilized to implement one or more exemplary embodiments of the present disclosure. In an aspect, the first oil impregnated sintered bush 205 is provided in the front-end region of the horizontal arm 202b and a second oil impregnated sintered bush 206 is provided in the second end region of the horizontal arm 202b. The first oil impregnated sintered bush 205 is provided near the front end 203a of the arm shaft 203 and the second oil impregnated sintered bush 206 is provided near the rear end 203b of the arm shaft 203.
[0068] The arm shaft 203 passed through the rear end 202bb of the horizontal arm 202b through the opening 204. Since second oil impregnated sintered bush 206 is provided in the rear end 202bb of the horizontal arm 202b, there is no need to provide lubrication in rear end 202bb of the horizontal arm 202b. Accordingly, there is no need to machine a lubrication channel in this region. This saves time during manufacturing of the sewing machine 200. Further, this reduces the probability of rust and corrosion in the rear end region of the horizontal arm 202b and rear end 203b of the arm shaft 203 as no lubrication channel is needed in this region. Further, there is no direct contact between the ferrous main body 202 to ferrous arm shaft 203.
[0069] Since first oil impregnated sintered bush 205 is provided in the front end 202ba of the horizontal arm 202b, there is no need to provide lubrication in front end 202ba of the horizontal arm 202b.
[0070] Since third oil impregnated sintered bush is provided in the needle bar area, there is no need to provide lubrication in the needle bar area.
[0071] The presence of second oil impregnated bush 206 in the rear end 202bb of the horizontal arm 202b reduces the starting torque required for rotating the arm shaft 203 during the initial stage. This results in ease in operation of the sewing machine 200.
[0072] FIG. 5 illustrates an assembled view of light duty sewing machine for industrial purposes with oil impregnated sintered bushes that can be utilized to implement one or more exemplary embodiments of the present disclosure. Although the outer structure 202 of the household sewing machine 200 is similar to the light duty sewing machine for industrial purpose 500, the structure 502 primarily differs in size and material. Further, the working mechanism and internal components of the household sewing machine 200 is different from the light duty sewing machine 500 for industrial purpose. The light duty sewing machine 500 for industrial purpose comprises a base 501, a main housing 502 and an arm shaft 503. The main housing 502 is adapted to accommodate the arm shaft 503. In an aspect of the embodiment, the arm shaft 503 is a straight rod. In the assembled state of the sewing machine, the arm shaft 503 is parallelly positioned with reference to the base 501. The base 501 is a horizontal platform over which the stitching operation is done. A first oil impregnated sintered bush 505 and/or a second oil impregnated sintered bush 506 and a third oil impregnated sintered bush 507 is provided in the main housing 502.
[0073] FIG. 6 illustrates an exemplary light duty industrial sewing machine outer structure that can be utilized to implement one or more exemplary embodiments of the present disclosure. The base 501 has a front end 501a and a rear end 501b. The stitching operation is performed over the front end 501a. The main housing 502 integrally extends vertically from the rear end 501b of the base 501. The main housing 502 comprises an upright arm 502a and a horizontal arm 502b. The upright arm 502a has a top end 502aa and a bottom end 502ab. The bottom end 502ab of the upright arm 502a extends integrally vertical from the rear end 501b of the base 501. The horizontal arm 502b has a front end 502ba and a rear end 502bb. The rear end 502bb of the horizontal arm 502b is integrally in connection with the top end 502aa of the upright arm 502a. The horizontal arm 502b runs parallel to the base 501.
[0074] The horizontal arm 502b of the main housing 502 is adapted to accommodate the arm shaft (shown in FIG. 7). The arm shaft 503 has a front end 503a and a rear end 503b. The front end 503a of the arm shaft 503 is positioned in the front-end region of the horizontal arm 502b and the rear end 503b of the arm shaft 503 is positioned in the rear end region of the horizontal arm 502b. The rear end 503b of the arm shaft 503 passes through the rear end 502bb of the horizontal arm 502b through an opening 504 provided on the rear end 502bb of the horizontal arm 502b.
[0075] In an aspect of the invention, in the horizontal arm 502b, a first bush seating area 601 is provided to accommodate first oil impregnated sintered bush and a second bush seating area 602 is provided to accommodate second oil impregnated sintered bush. A third bush seating area 603 is provided at the needle bar area of the horizontal arm 502b of the main housing of the sewing machine 500 to accommodate the third oil impregnated sintered bush.
[0076] To accommodate the first oil impregnated sintered bush and/or the second oil impregnated sintered bush and the third oil impregnated sintered bush in the horizontal arm 202b, the first bush seating area 601, the second bush seating area 602 and the third bush seating area 603 (layouts) are machined in the front-end region and rear end region of the horizontal arm 502b.
[0077] FIG. 7 illustrates an exemplary arm shaft with oil impregnated sintered bushes that can be utilized to implement one or more exemplary embodiments of the present disclosure.
[0078] In an aspect, the first oil impregnated sintered bush 505 is provided in the front-end region of the horizontal arm 502b and a second oil impregnated sintered bush 506 is provided in the second end region of the horizontal arm 502b. The first oil impregnated sintered bush 505 is provided near the front end 503a of the arm shaft 503 and the second oil impregnated sintered bush 506 is provided near the rear end 503b of the arm shaft 503.
[0079] The arm shaft 503 passed through the rear end 502bb of the horizontal arm 502b through the opening 504. Since second oil impregnated sintered bush 506 is provided in the rear end 502bb of the horizontal arm 502b, there is no need to provide lubrication in rear end 502bb of the horizontal arm 502b. Accordingly, there is no need to machine a lubrication channel in this region. This saves time during manufacturing of the sewing machine 500. Further, this reduces the probability of rust and corrosion in the rear end region of the horizontal arm 502b and rear end 503b of the arm shaft 503 as no lubrication channel is needed in this region. Further, there is no direct contact between the ferrous main body 502 to ferrous arm shaft 503.
[0080] Since first oil impregnated sintered bush 505 is provided in the front end 502ba of the horizontal arm 502b, there is no need to provide lubrication in front end 502ba of the horizontal arm 502b.
[0081] Since third oil impregnated sintered bush 507 is provided in the needle bar area, there is no need to provide lubrication in the needle bar area.
[0082] The presence of second oil impregnated bush 506 in the rear end 502bb of the horizontal arm 502b reduces the starting torque required for rotating the arm shaft 503 during the initial stage. This results in ease in operation of the sewing machine 500.
ADVANTAGES
[0083] The proposed household sewing machine and the light duty sewing machine for industrial purpose are equipped with the first oil impregnated sintered bush and/or the second oil impregnated sintered bush, and the third oil impregnated sintered bush, which eliminate the requirement of lubrication in the front end region, rear end region and needle bar region of the horizontal arm of the main housing. Consequently, the proposed household sewing machine and the light duty sewing machine for industrial purpose reduces the time spent on frequent lubrication application during operation of the machine. Accordingly, the proposed household sewing machine and the light duty sewing machine for industrial purpose reduces the maintenance requirements. Further, the presence of the second oil impregnated sintered bush in the proposed household sewing machine and the light duty sewing machine for industrial purpose minimizes the starting torque requirement which enhances the efficiency and ease of use of the sewing machine. Furthermore, the presence of second oil impregnated sintered bush in the household sewing machine and the light duty sewing machine for industrial purpose eliminates the presence of lubrication channel in the horizontal arm which ensures that the household sewing machine and the light duty sewing machine for industrial purpose is free from corrosion and rust due to presence of lubrication channel in the rear end of the horizontal arm of the main housing. Accordingly, the lifespan and durability of the household sewing machine and the light duty sewing machine for industrial purpose is enhanced. Overall the performance of the household sewing machine and the light duty sewing machine for industrial purpose and user experience is enhanced.
[0084] The above description does not provide specific details of the manufacture or design of the various components. Those of skill in the art are familiar with such details, and unless departures from those techniques are set out, techniques, known, related art or later developed designs and materials should be employed. Those in the art are capable of choosing suitable manufacturing and design details.
[0085] Further, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. It will be appreciated that several of the above-disclosed and other features and functions, or alternatives thereof, may be combined into other systems or applications. Various presently unforeseen or unanticipated alternatives, modifications, variations, or improvements therein may subsequently be made by those skilled in the art without departing from the scope of the present disclosure as encompassed by the following claims.
[0086] The claims, as originally presented and as they may be amended, encompass variations, alternatives, modifications, improvements, equivalents, and substantial equivalents of the embodiments and teachings disclosed herein, including those that are presently unforeseen or unappreciated, and that, for example, may arise from applicants/patentees and others.
[0087] It will be appreciated that variants of the above-disclosed and other features and functions, or alternatives thereof, may be combined into many other different systems or applications. Various presently unforeseen or unanticipated alternatives, modifications, variations, or improvements therein may be subsequently made by those skilled in the art which are also intended to be encompassed by the following claims.
,CLAIMS:We Claim:
1. A household sewing machine (200), the machine (200) comprises:
a base (201);
a main housing (202) integrally extending from the base (201), wherein the main housing (202) has an upright arm (202a) and a horizontal arm (202b); and
an arm shaft (203) adapted to positioned inside the horizontal arm (202b) of the main housing (202), wherein:
a first oil impregnated sintered bush (205) and/or a second oil impregnated sintered bush (206) is engaged with the arm shaft (203) to facilitate smooth rotation of the arm shaft (203); and
a third oil impregnated sintered bush (207) is accommodated in the needle bar region of the main body (202b).
2. The household sewing machine (200) as claimed in claim 1, wherein bottom end (202ab) of the upright arm (202a) integrally extends vertically from rear end (201b) of the base (201) and rear end (202bb) of the horizontal arm (202b) is integrally extended horizontally from the top end (202aa) of the upright arm (202a) making the horizontal arm (202b) parallel to the base (201).
3. The household sewing machine (200) as claimed in claim 1, wherein the first oil impregnated sintered bush (205) is provided in a first bush sitting area (301) of the horizontal arm (202b) of the main housing (202).
4. The household sewing machine (200) as claimed in claim 1, wherein the second oil impregnated sintered bush (206) is provided in a second bush sitting area (302) of the horizontal arm (202b) of the main housing (202).
5. The household sewing machine (200) as claimed in claim 1, wherein the third oil impregnated sintered bush (207) is provided in a third bush sitting area (303) in needle bar region of the horizontal arm (202b) of the main housing (202).
6. The household sewing machine (200) as claimed in claim 1, wherein the first bush sitting area (301) and/or the second bush sitting area (302) and the third bush sitting area (303) in the horizontal arm (202b) of the main housing (202) is provided through machining operation to accommodate the first oil impregnated sintered bush (205), the second oil impregnated sintered bush (206) and the third oil impregnated sintered bush (207).
7. The household sewing machine (200) as claimed in claim 1, wherein the arm shaft (203) has a u-shaped bend near the rear end (203b) of the arm shaft (203).
8. A light duty industrial sewing machine (500) for industrial purpose, the machine (500) comprises:
a base (501);
a main housing (502) integrally extending from the base (501), wherein the main housing (502) has an upright arm (502a) and a horizontal arm (502b); and
an arm shaft (503) adapted to positioned inside the horizontal arm (502a) of the main housing (502), wherein:
a first oil impregnated sintered bush (505) and/or a second oil impregnated sintered bush (506) is engaged with the arm shaft (503) to facilitate smooth rotation of the arm shaft (503); and
a third oil impregnated sintered bush (207) is accommodated in needle bar region of the main body (202b).

9. The light duty Industrial sewing machine (500) as claimed in claim 8, wherein bottom end (502ab) of the upright arm (502a) integrally extends vertically from rear end (501b) of the base (501) and rear end (502bb) of the horizontal arm (502b) is integrally extended horizontally from the top end (502aa) of the upright arm (502a) making the horizontal arm (502b) parallel to the base (501).
10. The light duty Industrial sewing machine (500) as claimed in claim 8, wherein the first oil impregnated sintered bush (505) is provided in a first bush sitting area (601) of the horizontal arm (502b) of the main housing (502).
11. The light duty Industrial sewing machine (500) as claimed in claim 8, wherein the oil impregnated second oil impregnated sintered bush (506) is provided in a second bush sitting area (602) of the horizontal arm (502b) of the main housing (502).
12. The household sewing machine (200) as claimed in claim 1, wherein the third oil impregnated sintered bush (507) is provided in a third bush sitting area (603) in needle bar region of the horizontal arm (502b) of the main housing (502).
13. The light duty Industrial sewing machine (500) as claimed in claim 8, wherein the first bush sitting area (601) and/or the second bush sitting area (602) and the third bush sitting area (603) in the horizontal arm (502b) of the main housing (502) is provided through machining operation to accommodate the first bush (505), the second bush (506) and the third bush (507).

14. The light duty Industrial sewing machine (500) as claimed in claim 8, wherein the arm shaft (503) is straight rod.