VG-series: Awarded New Machine Development Prize

Yamato Sewing Machine Mfg. Co., Ltd. (President: Shogo Kondo) was awarded the "Fiscal 1999, 30th "New Machine Development Prize" set up by Japan Society for the Promotion of Machine Industry for its development of "VG2700 ultrahigh-speed short cylinder bed interlock stitch machine". This prize was awarded to 8 companies (35 candidates, competitive rate 4.4 times). Yamato was awarded in the field of textile and dyeing machines. As a sewing machine, Yamato's VG series is the first machine to which this prize was awarded.

      

The company's achievement for which this prize was awarded is as follows.

Development of VG2700 ultra high-speed short cylinder bed interlock stitch machine by Yamato Sewing Machine Mfg. Co., Ltd.


Recommended by: Japan Sewing Machinery Manufacturers Association

 

Outline of achievement:

In response to the recent needs in the market, T-shirt and underwear's sleeve and bottom hemming process is under change from overlockstitching to 2-needle interlockstitching. Therefore, a short cylinder bed interlock stitch machine is in increasing demand and even copied Yamato machines are sold by an Asian maker on the worldwide market.

To cope with the above trend, Yamato began research for enhancing the quality of its sewing machines and has attained the world's highest sewing speed of 6,500 s.p.m. among the short cylinder bed interlock stitch machines available on the market, thereby contributing to improvement on productivity. Also, Yamato developed a new type sewing machine which incorporates a variety of innovative mechanisms for reducing loss time in sewing and ensures improved safety on use.

Technological features:

1 ) Maximum rotational speed 6,500 rpm is world's highest among the short cylinder bed interlock stitch machines available on the market.

2) Capable of carrying out condensed stitching with a new type feeding mechanism. (Stitch pitch is narrowed toward the end of sewing to prevent loosening of seam thread) and Short Cylinder (a space of 45 mm is secured at the left of the needle drop position).

3) Because the looper thread take-up cam has been shifted from the center of main shaft to the sewing machine frame (arm) position, 1) threading is easy, 2) winding of thread, if any, can be corrected in a shorter time and 3) cam can be attached and detached easily (replaceable with the cam for special thread or the one exclusive for 1 needle).

4) New development of a simple and convenient mechanism capable of changing the needle bar stroke depending on the kind of sewn product with no need for parts exchange.

5) Due to a mechanism which does not necessitate a needle guide for controlling the stitching performance at the top of needle bar, an enclosed structure is realised, in which the needle bar will not protrude beyond the top face of arm. So, safety is high and oil leakage can be prevented.

6) A self-cleaning system reduces entrance of dust into the cylinder.

Economy on practical use:

1) Enhancement of productivity thanks to maximum speed as high as 6,500 rpm (an increase of 500 rpm from the previous record). (It has been reported that a rise in the rotational speed of a sewing machine can lead to a 10% or more increase in productivity according to the process analysis by a major user in U.S.A.)

2) Even if thread is wound on the looper thread take-up cam, it can be removed in a shorter time (thus reducing loss time).

3) Troubles due to dust can be prevented with the self-cleaning system. Therefore, defective sewing will decrease to reduce loss due to corrective sewing.

Japan Society for the Promotion of Machine Industry (Chairman: Shoichiro Toyota) is a public corporation intended to make contribution to the growth of Japanese machine industry through management of effective and appropriate business in order to improve management in the machine industry, upgrade technological level and promote measures for vitalising this industry. It was founded in accordance with the general will and co-operation of the machine industry circle in August, 1964.

The new machine development prize is a custom to honor the enterprises and their staff in charge of engineering development that have conducted excellent engineering development and put the result into practice, thereby making significant contribution to Japanese machine industry.