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Table 1.1: Total cycle time of different buttonhole indexers along with ordinary buttonholing cycle time
Serial No. |
Machine Type |
Machine Model |
Pick the |
|
|
piece( in |
|
|
secs) |
Buttonholing( in secs)
|
Dispose( in secs)
Total Time( in secs)
|
Actual Time per buttonhole( in secs) |
1. |
GTN |
GTN1054BHVJ |
17 |
21( for 6) |
3 |
41 |
6.83 |
2. |
Duerkopp Adler |
Class 841 |
9 |
32( for 7) |
2 |
43 |
6.14 |
|
buttonhole Indexer |
|
|
|
|
|
|
3. |
Zoje |
ZJ-ACF-S-5780 |
5 |
9( for 3) |
1 |
15 |
5 |
4. |
Juki |
AC-172N-1790 |
4 |
20( for 5) |
3 |
27 |
5.4 |
5. |
Sakho |
SA-5800 BH |
6 |
26( for 6) |
5 |
37 |
6.16 |
|
Ordinary buttonholing machine |
540-100 |
4 |
36( for 5 with manual positioning) |
4 |
44 |
8.8 |
Table 1.2: Improvement in buttonhole indexers with respect to ordinary buttonholing machine in percentage with respect of actual sewing time, total cycle time, average production per hour and shirt completed per hour
Serial No.
Machine Type
Machine Model
% improvement in actual sewing time
% improvement in total cycle time
Average Production per hr in terms of no. of button-holes made
Shirts completed / hr with 6 buttonholes
1. GTN GTN1054BHVJ 51.3 % 22.3 % 458 76
2. Duerkopp Adler buttonhole Indexer
Class 841 36.5 % 30.1 % 509 85
58.33 % 43.1 % 626 104
4. Juki AC-172N-1790 44.44 % 38.63 % 579 96 5. Sakho SA-5800 BH 39.81 % 29.92 % 507 84
Table 1.3: Total cycle time of different button sewing indexers along with ordinary button sewing cycle time
Serial No.
Machine Type
Machine Model
Pick the piece( in seconds)
Buttonholing( in seconds)
Dispose( in seconds)
Total Time( in seconds)
Actual Time per buttonhole( in seconds)
1. Yuho U-2607-LK 4 17( for 5) 5 26 5.2
6 11( for 6) 4 21 3.5
3. Sakho SA5800 BS 8 14( for 6) 3 25 4.16
Ordinary button sewing machine
MB-372 |
2 |
30( for 6 |
|
|
with manual |
|
|
positioning) |
5 37 6.16
Table 1.4: Improvement in button sewing indexers with respect to ordinary button sewing machine in percentage with respect of actual sewing time, total cycle time, average production per hour and shirt completed per hour
Serial No.
Machine Type
1. Yuho Button indexer
2. GTN button indexer
3. Sakho button indexer
Machine Model
% improvement in actual sewing time
% improvement in total cycle time
Average Production per hour in terms of buttons stitched
Shirts completed per hour with 6 button placements
U-2607-LK 32 % 15.6 % 602 100
GTN-1054BSB 63.4 % 43.2 % 894 149
SA-5800-BS 53.33 % 32.43 % 751 125
GTN Buttonhole indexer with automatic stacker to keep pieces aside with Juki sewing head
the distance on the front placket of the shirt. After the buttonholes have been sewn, the shirt front slips towards the back of the machine with the help of third sub clamp catch plate and an automatic stacker comes from back of the machine to catch the piece over it and place it on a stand. This synchronization of the adjuster clamp, belt conveyor and stacker is made possible with the help of the touch screen control panel, in which the parameters of stitch density, stitch length, buttonhole length and fixing distance between buttonholes are defined before commencing operations of the machine. All the above automations work exactly in the same manner in case of button sewing indexers, except that buttons are fed by a button feeder which keeps delivering buttons to the sub clamp for placement of the sewing head.
Benefits of installing Buttonholing Indexers
Buttonholing indexers not only carry advantages like automatically and accurately sewing buttonhole in lockstitch mode but also having improved cycle time for sewing a buttonhole according to a recent time study done on different types of buttonhole indexers and ordinary
ESSENTIALS
Amongst the button sewing and buttonholing indexers, GTN and Zoje score above other manufacturers in terms of productivity and cycle time, hence can be used by manufacturers handling large quantities.
58 Apparel Online Bangladesh | AUGUST 2017 | www. apparelresources. com