JPS6016584Y2 - Pinch roller structure - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pinch roller structure when a medium is conveyed by a capstan roller and a pinch roller.

A feed roller mechanism consisting of a capstan roller (drive roller) and a pinch roller (idling roller) that presses against the drive roller using an elastic material is used to convey various strips, cards, and other media along the guide. It will be done.

In the conventional pinch roller in such a feed roller mechanism, both ends of the idling roller support shaft are supported by pivotable levers, and this lever is biased using a spring so that the idling roller comes into pressure contact with the drive roller. It is a structure.

However, in this conventional pinch roller structure, parts such as the lever, lever pivot, spring, and ring for preventing rotation of the idling roller support shaft must be prepared and assembled separately, resulting in a large number of parts and a complicated structure. Moreover, during assembly, precision was required for the parallelism of the respective support shafts of the idle roller and the drive roller, and the rollers could sometimes contact each other unevenly due to improper lever installation.

The present invention was devised in view of the above points, and aims to provide a pinch roller structure that reduces the number of parts, has a simple structure, is easy to assemble, and can reliably prevent uneven contact between the rollers. .

Therefore, in the pinch roller structure according to the present invention, an idling roller is rotatably mounted on its spindle, steps are formed at both ends of the spindle, and a pair of bifurcated arms for holding the spindle are provided. The idler roller is brought into pressure contact with the drive roller by a leaf spring member, and the tip of each arm has a curled part that wraps around both ends of the support shaft and grips it, and each curled part has a slit on the outer side. and an inner part, and each inner curl part wraps and holds the inner support shaft of the stepped part provided at the end of the support shaft, and each outer curl part wraps the support shaft around the leaf spring member. On the other hand, it is engaged with the stepped portion so as to be unable to rotate.

FIG. 1 is a side view of the feed roller mechanism according to the present invention.

A driving roller 3 for conveying a medium 2 along the guide 1 is installed at the bottom of the guide 1 .

An idling roller 4 is supported above the drive roller 3 by being pressed by a leaf spring 5 in a direction in which it comes into pressure contact with the drive roller 3.

The end of the leaf spring 5 is fixed to the guide 1 by spot welding, adhesive or other suitable means.

The idle roller 4 is rotatably mounted on its support shaft 6.

As shown in FIG. 2, this support shaft 6 has stepped portions 7 formed at both ends thereof.

The leaf spring 5 has a pair of arms 8 for holding the support shaft 6 from both sides, and a slit 10 is provided at the tip of the arm 8.
An inner curl portion 9a and an outer curl portion 9b which are divided into two are formed.

Each inner curl portion 9a wraps around and grips the cylindrical portion of the support shaft 6 on which the idle roller 4 is attached.

Each outer curled portion 9b faces the stepped portions 7 at both ends of the support shaft 6, is crushed using an appropriate tool, and is plastically deformed to engage with both ends 7.

Therefore, this support shaft 6 cannot rotate relative to the leaf spring 5, and the support shaft 6 does not fall off from the leaf spring 5.

In the pinch roller structure configured as described above, a plate spring is used as an elastic member that presses the idling roller against the drive roller, and the plate spring itself supports the idling roller.

Furthermore, stepped portions are formed at both ends of the spindle of the idler roller, and after the spindle and the idler roller are assembled and attached to the plate spring, the curled portion of the plate spring is plastically deformed to engage with the stepped portion.

Therefore, the number of parts constituting the pinch roller is reduced, the structure is simplified, and assembly work can be easily performed.

In addition, since the elastic force of the leaf spring 5 is applied equally to the support shaft 6 from both ends of the support shaft 6 via the arm 8, the peripheral surface of the idle roller is uniformly pressed against the peripheral surface of the drive roller, causing uneven contact. There isn't.

Further, even when the drive roller rotates at high speed, the idle roller support shaft does not rotate, so that wear of the curled portion of the leaf spring due to friction is prevented.

[Brief explanation of drawings]

FIG. 1 is a side view of a feed roller mechanism having a pinch roller structure according to the present invention, and FIG. 2 is an exploded view of the pinch roller structure according to the present invention. 3... Drive roller, 4... Idle roller, 5... Leaf spring, 6... Support shaft, 7...
...Stepped portion, 8...Arm, 9a, 9b...
...Curl section.

Claims (1)

[Scope of utility model registration request] In a pinch roller structure consisting of an idling roller that presses against a drive roller using an elastic material, the idling roller is rotatably mounted on its support shaft, step portions are formed at both ends of the support shaft, and the elastic material is constituted by a plate spring member having a pair of bifurcated arms for holding the above-mentioned support shaft, and the tip of each arm has a curled part that wraps around both ends of the above-mentioned support shaft to grip it. The curl part is divided into two parts, an outer part and an inner part, and each inner curl part wraps around and holds the inner support shaft of the stepped part provided at the end of the support shaft.Each outer curl part wraps around the support shaft. A pinch roller structure, characterized in that the pinch roller engages with the stepped portion so as to be unable to rotate with respect to the plate spring member.