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4-4. Paper Feed Mechanism

The paper feed mechanism consists of a paper feed motor, an idler gear, a platen and a traction unit.

The paper feed motor is a PM (Permanent Magnet) 4-phase and 48 pulse motor.

There are two ways of feeding paper into the printer: the friction method and the tractor method. You can select the

method you want to use by setting the release lever on the optional push tractor unit.

Position of release lever [1] [2]

Engaement of the PF idler gear Not linked Linked

Status of the PF roller and

Pressed Not

PF roller

Release lever position detector Open Closed

Paper feeding method Friction Tractor

• Friction Method

Friction method is selected when the release lever is position [1].

With this method, paper is pressed between the platen roller and the holder roller therefore, paper is fed as the rollers

turn.

As the paper feed motor is driven, the motor gear, through the idler gear, turns the platen gear in the paper feeding

direction. However, since the tractor gear and the tractor clutch are not linked at this time, the tractor unit will not

be driven.

• Tractor Method

Tractor method is selected when the release lever is position [2].

Paper feeding is facilitated by rotation of the sprocket pin of the tractor unit. When the tractor method is selected,

the PF idler gear is linked to the PF idler gear, enabling the drive force generated by the paper feed motor to be

transferred to the tractor unit via the idler gear.

Fig. 2-7 Paper Feed Mechanism

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