A sheet-feeding device for a recorder has a recording sheet (P) fed on a cylindrical platen (1) which is retained by a sheet-retaining roller.

Each substrate holding roller (120) has a circular tube section (121) and holding flanges (123a, b) each located at a portion of the outer periphery of each of opposite end surfaces of the circular tube section (121).

At least one of the cam followers is a restriction cam follower of which the tube engaging surface engages the flexible tube segment for a longer period than that of the other cam followers.

The retainer includes an alignment feature configured to receive the drive roll.

The flared roller-retaining surface is located more or less in the extension of the flared needle-retaining surface (20).

The piston is attached to the piston holding portion (7) of the roller clip.

At least one roller cage (7) for the deep-rolling roller head (1) is designed as a cage roller (9), and for the deep-rolling roller (3) a retaining device is provided in the form of a retaining metal plate (14).

The roller head has a center opening and the roller shaft has an end part which is trapped in the center opening of the roller head without requiring the use of separate fasteners.

The curved shoe distributes force from the piston rod onto a relatively large area of the cam bearing and a retaining ring holds each shoe against the cam bearing.

A sheet-feeding device for a recorder has a recording sheet (P) fed on a cylindrical platen (1) which is retained by a sheet-retaining roller.

The curved shoe distributes force from the piston rod onto a relatively large area of the cam bearing and a retaining ring holds each shoe against the cam bearing.

  When the roller makes contact with the other surface of the continuing sheet, the direction of the center axis of the roller intersects the direction of the center axis passing through the center of the circle of the circular arc-shaped holding surface.

Each roller member has a pair of protuberances at both ends, and the protuberances are clamped rotatably between adjacent pairs of retainer portions.

Cylindrical rollers (10), which are held by the retainers (4), are each disposed at axial the other end of each sprag (3).

The retaining unit has a ring (8) mounted at the end of the arm and spaced from the pins (4), said ring including on the outside and at least on the major portion of its circumference a flange (18) for positively retaining the roller.