More Blocks!

Marcy Petrini 

November, 2024

 

Just a few days away!

 

Because of this seminar, I have been thinking a lot about blocks…. More to come in December.

Meanwhile, here are two of my favorite blocks.

 

 

 

 

Can you believe that they were woven on the same threading? Do you know what they are?

 

Happy Weaving!

 

Marcy

 

 

Twill Blocks on 8 Shafts

Marcy Petrini 

September, 2024

 

My blog in August was about developing an eight-shaft tie-up for broken twills blocks, also called false satin. Here is the drawdown as a reminder:

  

 

I wove the sample and here it is:

 

 

Next, I wove the classical turned twill blocks. Here is the sample:

 

 

Below is the drawdown with the tie up for the turned twill blocks; it is derived from the broken twill by returning all quadrant to a straight 1/3 (or 3/1) twill tie-up.

 

 

There is a bit of warp left, so rethreading may be in order. There are other options for twill blocks and other structures.

Happy weaving and happy fall.

Marcy

 

 

Pointed Twill Blocks

Marcy Petrini 

October, 2024

 

After working through the tie-up and treadling steps for two twill blocks, I decided to use the warp still on the loom for some more experimenting. I wrote about these two twills block, false satin and turned twills, in the August and September blogs.

Looking at the twill block chapter in Strickler’s book, I was struck by how many of the blocks had treadlings that didn’t produce blocks, rather stripes. Others are intricate blocks, and some others are color and weave effect. They are all very interesting, but I wanted to go back to basics.

I thought I would try the next logical step, the pointed twill.

Strickler describes the threading process for twill blocks as using two repeats of a four-shaft twill, first on shafts 1 through 4, then on shafts 5 through 8. I decided to try that with the same tie-up as the turned twill blocks and a “tromp-as-writ” treadling.

Here is the starting drawdown.

 

 

 

I made two decisions. The first is that I didn’t balance the threading because I wanted to maintain plain weave across the width of the fabric, as visible from the drawdown. That is not necessary and starting with a balanced threading for the two repeats on the two sets of shafts would result in different motifs.

My second decision was to start the treadling steps as “tromp as writ” but balanced, because I wanted the top and bottom of the blocks to be mirror images.

When I design motifs as I did here, I may change the threading or the treadling steps. The latter may be changed in the tie-up or in the sequence of activating the treadles. In my case, I threaded the loom first, so my only choice was to change the motif looks by changing the treadling steps.

I noticed that there were several places where the motifs were not symmetrical within the block. These are circled below in the partial drawdown of the right corner.

 

 

 

I looked at each one of the places where the motifs were not symmetrical left to right. For each, I looked at which shaft on which treadle was causing the asymmetry or which shaft added to a treadle would result in symmetry.

For example, looking at the top right of the warp-faced block on shafts 5 through 8 (circled above), I saw that shaft 5 on treadle 2 was causing that right corner not to be matched to the left corner. Removing shaft 5 from treadle 2 solved the asymmetry.

There were three other places that I changed: a) add shaft 1 to treadle 3; b) remove shaft 1 from treadle 7; c) add shaft 5 to treadle 7.

The two tie-ups are below for comparison, with the changes highlighted. The original on the left, the final on the right.

 

 

Below is the final drawdown

 

 

Here are the samples, front and back woven from the drawdown above.

 

 

I would like to clarify the treadling nomenclature. It you look at the treadling sequence between the original and final drawdowns, it hasn’t changed. But, since the tie-ups have changed, the treadling steps have changed!

I have heard people say: the treadling didn’t change but the tie-up did. What they mean is the treadling sequence didn’t change. Think about weaving on a table loom. The levers that you would engage for the final drawdown are not the same as those you would use for the original one. The terminology is confusing.

To avoid the confusion, I use the terms treadling steps for the combination of which treadle I step on and what shafts are attached to it, and treadling sequence for the numerical list of the steps.

For example, in the drawdown above, the first part of my treadling sequence is: 1, 2, 3, 4.

My treadling is:
           1, 5, 6, 7
           2, 6, 8
           1, 3, 5, 7, 8
           4, 6, 7, 8

If I were to give you just the treadling sequence 1, 2, 3, 4, you would have no idea how to weave it. But there would be no ambiguity with the treadling steps listed above.

Next, I tried some more options on the same threading, with a different tie-up. Below is the starting drawdown of an example.

 

 

To arrive at the final drawdown, I changed both the tie-up and the treadling sequence, as shown below.

 

 

Do you see the difference? To avoid half motifs, I changed the treadling sequence; to obtain symmetry I changed the tie-up. Do you see where?

Below is the front and back of the sample woven from the modified drawdown.

 

 

 

Happy Weaving!

Marcy

 

 

Twill Blocks Tie-Up

Marcy Petrini 

August, 2024

 

It invariably happens that when I teach a topic, I come away with more ideas. I offered a seminar on blocks at Convergence^® 2024 and as I was finishing the handout, I thought of things that I wanted to change.

One of the areas is twill blocks on eight shafts. In my monograph on eight shaft twills, I have taken a straight draw and wove the two halves as 1/3 and 3/1 broken twills, forming blocks, one block weft dominant, the other warp dominant and then reversed. We also call these twills false satins, so two blocks of false satins form a false damask.

Below is the drawdown and the fabric woven from it.

  

 

 

There are two lessons to be learned from these figures. We can see that they are formed with broken twills; they are false satin and not true satin blocks because the twill lines are still visible. A true satin has “the suppression of the appearance of diagonals” as defined by Emory (Emory, Irene. The Primary Structure of Fabrics. Washington, D.C.: The Textile Museum, 1980.)

The second lesson is that floats of a 1/3 and 3/1 twill should be three threads long for both weft and warp floats. In the above fabric and drawdown, I wasn’t careful and where the blocks meet, some of the floats carry over into the next block, sometimes resulting in a four-thread float.

In some of the variations of this structure, Carol Strickler in her book (A Weaver’s Book of 8-Shaft Patterns) describes these blocks as having units, one on shafts 1 through 4 forming block A, the other on shafts 5 through 8 for block B. The same twill is used for both units and each unit can be repeated. The drawdown below is an example. Block A is formed with two repeats of the straight twill on four shafts; block B is the same configuration, but on the second set of shafts. The treadling is weaving the blocks to square, one weft dominant, the other warp dominant, and then reversing.

   

This drawdown also appears in my monograph, and it has the same problem as the previous one: floats continuing into the adjacent block.

Now, however, I want to weave this structure, so it’s time to think about making the floats the correct length. I could just copy the tie-up and treadling from Strickler’s book, but I want to understand how to manipulate the tie-up to achieve that goal. I have seen others just break the twill and not worry about the spill-over floats as I did. We can think about developing the correct tie up. (The next set of figures derive the drawdown; if you don’t want to follow it, see Figure 11, the final result.)

When I weave broken twills, I usually “break” the twill in the threading, between shafts 2 and 3. Thus, the resulting threading is 1, 3, 2, 4. When treadled as a 2/2 straight draw, this has the advantage of not needing floating selvages because of the odd vs. even edges in the threading.

However, straight twill threadings are more versatile for twill blocks. Then the tie-up can be broken. I used the same 1, 3, 2, 4 which resulted in the next drawdown.

 

  

This portion of the tie-up and treadling weaves blocks A weft dominant.

We can repeat this tie-up for the second block; however, the weft-dominant tie-up and treadling for block B must occur when block A weaves the warp-dominant twill, as in the drawdown below:

 

 

The next step is to find a warp dominant tie up for the shafts 5 through 8. There must be three warp thread and one weft thread for each twill repeat. Warp threads in the warp dominant block B cannot be adjacent to warp threads at the edge of the weft dominant block A. It’s a bit like solving a puzzle.

I approach this tie-up by figuring out which shaft can be tied to which treadle, using the limitations described above.

Shaft 5 can show warp with treadling step 1, 2 and 3, since the adjacent shaft 4 shows weft. Then treadling step 4 for shaft 5 will show weft, since shaft 4 shows warp. The drawdown is below:

 

 

We can use the same strategy on the other side of the block, with shaft 8. Shaft 1 shows warp with the first pick, and weft with picks two through four. Thus, shaft 8 must show weft on the first pick and warp for the remaining three, as shown in the drawdown below.

 

 

Next, I want to look at the bottom and the top of the warp-dominant block B where it meets the top and bottom of the weft-dominant block B. In order to see top and bottom I must extend the treadling steps 1 through 4.

 

 

For treadling step 4, shafts 6 and 7 must show warp since step 5 shows weft. For treadling step 1, shafts 6 and 7 must also show warp since step 8 shows weft.

 

 

Next, we need to fill in the treadling by following the rules: warp on shaft 6 for treadling step 3, in order to have a three-thread warp float. Similarly, warp on shaft 7 for treadling step 2.

 

 

Our last step is to do the tie-up for warp-dominant block A, which we do in parallel to block B.  To complete the drawdown, we repeat treadling steps 5 through 8 again. Below is the final drawdown.

  

 

Done! To check that all the floats are never longer than three threads, I use the float analysis of the drawdown software and it confirms it.

Describing the process takes longer than to do the steps!

I figured that there is more than one way to treadle these twill blocks. I was curious what tie-up is used in Strickler’s book, so I did the drawdown exactly as it appears, shown below:

 

 

Totally different approach, same result.

While going through the process, I noticed how the tie-up is organized, which is more obvious when looking at it as filled boxes rather than numbers. On the left is the one we just derived, on the right the one from Strickler.

 

 

The parallel images of the opposite quadrants and the mirror images of the adjacent quadrants are obvious and can be used to determine a drawdown.

Next time you look at a complicated tie-up, and wonder how the weaver ever arrived at it, now you know!

And the fabric…. The warp is wound…. Stay tuned….

 

Happy Weaving!

Marcy