Showing posts with label Repairs. Show all posts
Showing posts with label Repairs. Show all posts

October 13, 2014

What makes a second a second in apparel quality standards?

In the fashion industry a second is an item with a few defects that can still be worn or used. If there are seconds, then there are firsts though we don't call them that. We may call them first quality, though I rarely hear that term either. The word quality, all by itself, is a controversial term with various meanings attached to it. If there are firsts and seconds, then there are also thirds.

The goal of any company is to produce goods without any defects for the least amount of money possible. But as we all live in the real world, defects happen. I've worked for three different companies and how each handled defects were roughly the same. Each company came up with a ranking system to evaluate product during production and as it came off the line. Each ranking was called something a little different though they conveyed the same meaning. The qualification for each ranking varied and the product that fell into each ranking was handled differently. Here is a brief break down.

First - top quality goods with no obvious defects

Second - goods with X number of defects that may or may not be repaired, but still wearable or usable and can be sold on a secondary market.

Third - goods with sufficient number of serious defects to render the item unwearable or usable. These goods may be sold for scrap and may be called rejects.

Quality can be subjective and that can cause problems not only in production but in the retail sector. A first quality item can be rendered second or third after it's first wearing and washing. In that case, was the item truly a first quality item? Perhaps not. Likewise, a second can be repaired sufficiently to make it a first quality item. But is it financially feasible to repair a second to make it a first? These are all questions that individual companies must deal with as they develop and sell product. In order to not get too long-winded on this subject, let's look at something I recently purchased at the thrift store.

A shirt with defects that are not obvious
This is a cute knit top that I found at a thrift store for a few dollars. It looked pretty good when I tried it on in the dressing room, but as usual the lighting was bad and I missed some obvious problems. Once home I tried it on again and immediately saw a problem with the gathers on the neckband. I also noticed the brand label and content tag were off center. Also the elastic on one of the sleeve hems was pulling away. It is true that most thrift store clothes are previously worn and I have no doubt this shirt fit that category. But because of the defects, I think this shirt started life as a second and was likely sold at an outlet store or other secondary market.

Defect along the neckline band seam
A closer look reveals the problem on the neckline. There is some fabric caught in the seam. Unfortunately, I did not take any pictures of the problem from the other side, but the fabric caught in the stitching is more obvious. 

This style of neckline would be difficult to sew, especially in a factory. First, each gathered area was pre-gathered by applying 1/4 inch clear elastic - stretched between notches. Next, the operator prepares the neck band. The tie and neckband are one piece. The tie portion is sewn and turned out and the rest of the neckband is folded in half. Hopefully there were notches to help the operator position the neck band on the neck, otherwise it would be easy to skew the neckband. Anyway, the operator matches up the neckband to the neckline, starting the sewing on the left side neck. The neckband would be on top and the neckline on bottom. The operator has to match the pre-gathered section from underneath to meet a match point on the band, catch enough of the seam under the foot securely and then stitch the pre-gathered section to the neckband. Hopefully there is another notch to indicate where the pre-gathered section should end. The sewing continues around the neck to the right side, where there is hopefully another notch to indicate where the next pre-gathered section should start. The neckline is then finished off, overedging the center front neck which is left unattached from the neckband. This small section is later topstitched down. Finally, the next operator would place the brand and size label to the back neck with a single needle machine within the seam allowance of the neckband/neckline.


The most difficult part of this whole sequence of steps would be where the operator starts attaching the neckband on the left side. The pre-gathered section is not stable and will move around as the pieces are placed under the foot. This is what happened here. Some additional fabric worked its way under the foot as the sewing began. The label placement would be difficult because the operator would have to guess where center back is and place the labels on a knit top that likes to move around.

This type of defect would have been difficult to repair in a factory. The elastic and two rows of stitching would be time consuming to undo and redo and look good. The poor placement of the brand labels would have been a second strike. The top was still wearable though and likely sold as a second or at a steep discount. I imagine there were quite a few seconds on this style....

Anyway, I was able to repair this top. I carefully unpicked the band with my fingers crossed that none of the shirt was cut when it was stitched. Luckily it wasn't. I removed some of the elastic in the affected area (it wasn't worth redoing the whole gathered area with the elastic), and regathered the neckline with a needle and thread. I then basted the neckband and neckline together to double check it was all right and stitched it back together. Almost as good as new - at least you can't tell there had ever been a problem.

Repair of the neckband seam


September 23, 2013

Repairing a leather sewing machine belt

If you own a sewing machine (industrial or otherwise) with a leather sewing machine belt, chances are that you will have to either replace or repair it at some point. Leather belts will stretch or shrink, and/or break. The climate of your workspace and other variables play into the life and condition of the belt. The area around the belt clip tends to get a lot of wear too. Leather belts are a little old school, but they do have a few advantages. They are customizable and relatively easy to fix.

You'll know you have a problem when the belt ends up in pieces or the machine is not operating properly. The leather belt on my Singer Hemstitcher 72w-19 machine stretched out over time and my machine was not going as fast as it should. It was time to shorten the belt.

Tools needed to repair a leather sewing machine belt.
Any workshop should have a toolbox. For this job, you'll need these tools:

  1. Drill
  2. 3/32nd drill bit
  3. Scrap wood
  4. Pliers
  5. Hammer
  6. Utility knife (not pictured)
  7. Belt clips (not pictured)
I purchased a box of 500 belt clips from Southstar Supply. It sounds like overkill, but believe me, you will probably mess up the clip the first time you do it. Southstar also sells leather belting. You'll want extra length because you never know when you'll need it. Leather belting is not cheap, and there are other places on the net that will sell it in cut lengths. So it pays to repair a belt when you can.

One more note. There is a special tool designed to punch a hole in the leather belt for the belt clip. It's expensive. It doesn't work well (from what I'm told) and you don't need it. A drill with the right drill bit works really, really well.

Drilling a hole in a leather belt for a sewing machine

In my case, I first removed the belt from the machine by bending the existing belt clip apart with pliers. You won't be able to reuse it, so don't bother trying to save it (this is why you want a box of 500!).

Next, determine how much to shorten the belt. It won't be as much as you think. If you make the belt too short, the belt won't fit or the belt will exert too much tension on the machine causing the machine to work harder than it should. Using the utility knife, I only shortened the belt 1/4".

About 1/4" from the cut end, drill a hole through the center of the belt. Be sure to drill the hole on top of some scrap wood so you don't damage your work table! You do need your other hand to help steady the belt as you drill, but I was taking a demo picture by myself. All other safe tool handling rules apply.
Inserting a belt clip into a leather sewing machine belt

Place the belt clip through both holes to test, but don't mash the belt clip closed yet (Yes, I've done this!). Take the belt clip off one side and take the belt to the machine and thread it through the holes in the table. Attach the belt clip to the belt ends and place it over the handwheel and motor pulley to test the tension.

Leather sewing machine belt in place

How much tension is needed? It depends on your machine. You need just enough to turn the handwheel properly. In the photo below I'm testing the tension (or slack) on the belt. This is about how much I need to have the machine operate properly.

Testing the tension of a leather sewing machine belt

Finally, mash the belt clip closed with the pliers (sometimes you need a hammer) and you're good to go. It's amazing that a 1/4" shorter in length makes a big difference!

April 23, 2009

A tale of a broken screw, loose screws and a DIY mechanic for the Singer Hemstitcher 72w-19

This lovely 72w19 Singer Hemstitcher (circa 1945) has caused me all kinds of grief this month.

Singer Hemstitcher 72w-19
I have had a persistent problem with this machine every since I purchased it 4 years ago. The left needle thread has a tendency to break, almost randomly. I can stitch some distance, it will start skipping and then get cut by either the needles or the piercer. I have played around with various settings and adjustments continuously over all this time. Sometimes I can improve it, other times it becomes worse. Despite all these adjustments, the right needle continues to behave as it should and the left will not.

One day, I noticed that the piercer holder was loose. I could wiggle it with my finger. This led to me over tightening the piercer holder screw and breaking it. This screw is a size #6 and some of the screw was stuck in the machine. How to get it out?

Broken screw in a Singer Hemstitcher 72w-19 piercer

It would be easy to say I am not a sewing machine mechanic. I have done some basic tuning up on regular sewing machines. Set the timing on both of my sewing machines. Cleaned, oiled, lubed. But that is about it. Armed with my 72w19 manual, I set out to fix my machine, extract that screw and get to the bottom of the thread breakage problem. The engineers who designed this machine and most mechanics who worked on these are all gone now. Those that are left are hobbyists, for the most part. Some are very good, but too far away to consult. Other mechanics rarely work on or understand these machines.

Even with the manual, there are gaps of knowledge. Perhaps later I will post a little about the history of these machines. One thing I did learn is that the ladies who purchased these machines attended a training and certification class so they could adjust them on their own. I am sure they picked up all kinds of information never written in the manual.

So back to the broken screw. Nothing could happen until that screw was extracted and replaced (and luckily I did find a replacement).

Assemble some basic tools:
1. Drill (variable speed, set on slowest setting)
2. Very small metal cutting drill bits (like 5/64")
3. Punch
4. Extractors and/or left hand drill bits
5. A steady hand.

Step 1
Use an auto centering punch to punch a pilot hole into the broken screw. There are different sizes and shapes of punches. I found one that is about the size of an ink pen. You press down on it and an internal spring forces the punch. A very nifty and useful gadget for small spaces (also expensive uni-tasker). You may need to do several punches because the surface of the broken screw will probably be uneven. This punch is critical so that the drill with a metal cutting bit doesn't float around.

Step 2
Using the drill with the regular metal cutting bit, drill a hole in the center of the broken screw. Make sure the drill is on a slow speed setting. In my case, I could drill all the way through the center of the screw to the other side and not risk damaging other components. Even so, drill just far enough to be able insert a slightly larger extractor or left hand drill bit. Stop every so often to clean out the hole and to let the drill bit cool off. The drill bit may dull quickly, so be prepared to replace it.

Step 3
If the screw is not jammed too tightly into the machine, you may be able to insert the extractor and turn the screw out by hand. This is what I ended up doing in my case. If you need more power, use the drill but be sure to reverse the direction of the drill.

And here is the result. You can see how small that broken screw bit was and why I was so nervous about it.
Screw extractor and broken screw part
With the broken screw removed and a new one inserted, I once again began to check all the possible adjustments. In this I discovered more lose screws. There were lose screws on the piercer bar, and underneath the bobbin. Cleaned more lint and gunk out of areas I rarely clean. Oiled every moving part. Adjusted the vibration (zig-zag), pitmans, levers, etc. I could definitely say I have learned a lot by over adjusting some part and seeing what would happen (very carefully of course). I think I may have zeroed in on the vibration setting as the sources of the skipping as the left needle only skips on the inside vibration.

And then the piercer snapped in half the other day. I can't figure out how or why. Did I have it set too low in the machine? Maybe it was just worn out and over abused?

Thankfully, replacement piercers can still be found. Though they are very expensive. I bought two, just in case this happens again. Hopefully not.