Intermittent motion machines

Some machines, e.g., Bosch GKF, Index, Impressa and Zanasi, are called intermittent motion machines because they exhibit an interrupted filling sequence. That is, indexing turntables must stop at specific stations to execute the various operations described above. Continuous motion machines, e.g., MG2 and Matic, execute these functions in a continuous cycle. Eliminating the need to decelerate and accelerate from one station to the next makes possible higher machine speeds with the continuous motion machines (24). 

In commercial practice, packaging is produced from continuous web on intermittent-motion thermoforming/die-cut machines. The web edge is clamped and conveyed into a heating box. If a plastic with a narrow softening temperature is used, heating is carefully controUed from top and bottom. 

JR Britten, MI Barnett, NA Armstrong. Construction of an intermittant-motion capsule filling machine simulator. Pharm Res 12 196-200, 1995. 

Figure 1 Dosator from a Zanasi LZ-64 intermittant motion filling machine.

Automatic. There are two basic types of machines—intermittent motion and continuous motion. The intermittent is smaller, slower, and cheaper, usually with a blade-opening action for the carton prebreak so that it is likely to accept... 

There are two basic types of machine—intermittent motion and continuous motion. The intermittent is the smaller, slower and cheaper, usually with a blade opening action for the carton pre-break, so that it is likely to accept a lower quality of carton than the really high-speed machines. The continuous motion machines tend to be much larger, faster and more expensive and, being much faster with vacuum pick-up of the carton for a knock pre-break, are much more sensitive to the quality of the carton presented. 

The key technologies for microgrinding machine tools also include rapid response speed and extremely smooth movements in the X-Y-Z axis, the main spindle, and the fine infeed. Therefore, the driving resistance and the intermittent motion such as stick-slip must be avoided. As shown in Figure 1.21, the current trend in movements for X-Y-Z axis and the main spindle is to replace the friction of solid-solid contact with pneumatic or hydraulic friction. ° ... 

Intermittent motion arises from an interaction between the machine and the frictional energy dissipation process 38,39. The latter includes the static and kinetic friction of the contact. 

In these experiments a complication is introduced because of the relatively long time constant of the microbalance which supports the hanging fibre. This would appreciably attenuate the frictional force at high tensions which also corresponds to the high frequencies of intermittent motion. A part of the observed response may originate in this machine effect. 

Fully automatic machines are based on either continuous or intermittent movement of the web through the unit, or a combination of the two. Until recently this motion depended on whether certain processes were carried out on platens or cylinders. It is now possible to use platens which have a reciprocating action whereby continuous motion can be maintained. The basic machine operations performed on a machine are ... 

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