Section 131. Any person owning, managing or operating a factory where looms are used shall equip them with such guards or other devices as will prevent injury to employees from shuttles falling or being thrown from the looms. Such guards or devices shall be made of such material and be placed in such manner as shall be approved by the department. Whoever violates this section shall be punished by a fine of not more than one hundred dollars for every week during which the violation continues.