Do I need join(s) in this?

I have a db with the following tables, with pertinent fields listed: 

Locations-pk_LocationID, Location, Bed, Service

Observers- pk_ObserverID, ObserverName

TimeClock- pk_ClockID, TimeIN, TimeOUT, Date

Cases- pk_CaseID, Date, Start Time.

Delays- pk_DelayID, DelayCode, Duration

For a given record, a location can have one observer, each observer can have multiple cases, but each case has only one observer, and each case can have multiple delays (fixed list of delay codes). 

For the time clock, each observer can have multiple time clock entries, but each entry can have only one observer. Time clock entries do not need a relationship to/don't reference the other tables. 

Data entry is entirely through a layout referencing the 'cases' table. As a result, when a new record is created through the cases table, a new observer and location record is created. I use a portal to enter delays via the cases table, so for each caseID, I have multiple delay records. 

The first file shows the relationships I have now (I have removed everything but the tables/fields). The second file contains where I believe I need to put in some join tables. 

I'd really appreciate some feedback!

Examples.zip