1) Punching-in device 
A time clock, sometimes known as a clock card machine or punch clock or time recorder, is a mechanical (or electronic) timepiece used to assist in tracking the hours worked by an employee of a company. In regard to mechanical time clocks this was accomplished by inserting a heavy paper card, called a time card, into a slot on the time clock. When ...
An instrument that records the time an associate begins and ends work. The time is usually displayed on a time card or electronic monitor. Used to calculate hourly wages or weekly wages for hours worked. 
[n] - clock used to record the hours that people work
noun clock used to record the hours that people work