It is essential that the reader get these explanations of the different parts and their functions well fixed in his mind in order to understand intelligently the relation of one to the other.
Fig. 47 is a drawing of the cams and cam plates, and Fig. 48 shows the top of the carriage with the cams or locks mounted underneath. In the Dubied machine this part of the carriage on which the locks are fixed is detachable, and either side may be taken off separately, which arrangement is very convenient at times. At the left of Fig. 48 will be seen several slides, designated by small letters, which extend through the locks at different points between the cam plate and the carriage proper, and some on the top of the carriage. These are the essence of the automatic control of the stitch forming mechanism. This principle is followed in all automatic machines of this type, although the different builders vary in the details of construction and in the methods of moving these slides, as well as the manner of operating on the cams and yarn carriers.
Fig. 47.
Cam Arrangement of Dubied Single Lock Machine.
Fig. 48.
Top Side of Carriage Directly Over Locks or Cams, Dubied Single
Lock Machine.
These slides make the proper cam or yarn guide changes by being pushed in or pulled out, as the case may be, and this is done by the levers indicated by the letters a to i, Fig. 46. Each slide is provided with a flat spot or shoulder, as indicated at m and o, Fig. 48, which pushes them in upon coming in contact with the proper lever as the carriage reaches the extreme left end and is clear of the needles. In order to have these slides moved in just the proper distance there are projections from the carriage underneath the slides with beveled ends, part of which may be seen in Fig. 48 at k and i, which push the levers off the before-mentioned shoulders and release the slides at just the proper time. To explain the drawing out of these slides, it will be noted that each slide has an enlarged part or head and all have at least one right angled shoulder on the inside of the head; some have two.
It will also be noted that each one has under it a guard or extension from the carriage, which is fixed to the carriage and is stationary, as e and p. This extension also has an enlarged part or head on the outer end, but it is different from the heads on the levers in one respect, this head has sloping shoulders on both ends instead of the right angled shoulders that are on the inside head of the slides. Where a fixed guard or extension has a sloping shoulder on both sides (not ends) they will be found to be at different distances from the carriage.
The right angled shouldered heads on the slides are made in this way so that when the proper lever (Fig. 46) is placed in its path, which is done by the studs attached to the main chain S, it will slide over the head and drop in back of the shoulder as the carriage moves to the left, and when the carriage moves to the right the lever catches on the shoulder and draws it out until the lever is released by being pushed out by the sloping shoulder of the extension underneath. When the fixed extension has a sloping shoulder on both sides at different distances from the carriage proper it will be found that the slide also has a right angled shoulder on both sides. This indicates that this slide may be moved to any one of three different positions, therefore has a choice of three different functions it may perform in the automatic changes.