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14.26.6 Star-Wheel Cam for Intermittent Motion The conventional star-wheel mechanism is the most versatile of the intermittent mechanisms. However, it can be shown that the follower slot takes the path of an epicycloid, which gives inherently unfavorable dynamic properties. The poor acceleration curve limits highspeed application to machinery. In the conventional star-wheel mechanism, Fig. 14.38b, the drive roller is enclosed on both sides of the star-wheel follower slot during indexing operation. However, a physical change in the arrangement of parts may be made to permit the use of camlike surfaces. In this design, two rollers and two cam surfaces are employed. In Fig. 14.38a, we see the counterclockwise-rotating driver indexing (positive acceleration) the clockwise-rotating star-wheel follower. The drive roller and the control cam are on the driving member, with the control roller and the drive cam on the driven star-wheel follower. The drive roller is in contact with the drive cam with the control roller in contact with the control cam. Note that the drive roller contacts one side of the slot only, with clearance on the other side of its slot. Positive engagement, therefore, is the only function of the control roller and its contacting control cam. Figure 14.38b shows an installation having the rollers on the driver and the cams on the driven member. As with all other cam mechanisms, the cam surfaces may have any form. It has been found that proper choice of acceleration curve (trapezoidal or cycloidal) will reduce the maximum acceleration value to one-half that with the basic star-wheel mechanism. A nite jerk exists at all times. This mechanism has been used in various lithographic offset and typographic presses. In one installation, a 12-inch cylinder weighing about 1000 pounds was driven with a maximum velocity of 250 rpm with one standstill period per revolution.

Summary

method of this section. Also nd (b) at point the characteristic values of displacement, velocity, and acceleration.

Laws and regulations are one of the primary reasons why organizations perform internal and external audits. Regulations on industries generally translate into additional effort on target companies parts to track their compliance. This tracking takes on the form of internal auditing, and new regulations sometimes also require external audits. And while other factors such as competitive pressures can compel an organization to begin or increase auditing activities, this section discusses laws and regulations that require auditing. Almost every industry sector is subject to laws and regulations that affect organizations use of information systems. These laws are concerned primarily with one or more of the following characteristics and uses of information and information systems: Security Some information in information systems is valuable and/or sensitive, such as financial and medical records. Many laws and regulations require such information to be protected so that it cannot be accessed by unauthorized parties and that information systems be free of defects, vulnerabilities, malware, and other threats. Integrity Some regulations are focused on the integrity of information to ensure that it is correct and that the systems it resides on are free of vulnerabilities and defects that could make or allow improper changes. Privacy Many information systems store information that is considered private. This includes financial records, medical records, and other information about people that they feel should be protected.

Requirements traceability matrix Requirements allocation to system components in both the design specification and the bill of materials, phases, and test plans. (M) Workflow document Allocation of tasks for tenprint, latent and administrative use for remote users, local tenprint users, forensic (latent) users, and system administrators to include backup and restore of the system and its databases and the latent case management subsystem. (R) System design To document design particulars to include, but not be limited to, components, communications links, inter and intra site or configuration item communication loads, databases, security features,