# US 2017/0282602 A1 · Conveyance apparatus of web being print medium

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- Number: US 2017/0282602 A1
- Document ID: US20170282602A1
- Status: Published application
- Kind: A1
- Application number: 15/443,022
- Filed: 2017-02-27
- Published: 2017-10-05
- Earliest claimed: 2016-03-30
- Assignees: Riso Kagaku Corporation
- Applicants: Riso Kagaku Corporation
- Inventors: Kazuyuki AOKI
- Web page: https://patentgrep.com/patent/US20170282602A1

## CPC

- B41J 13/0009: {control of the transport of the copy material}
- B41J 15/16: Means for tensioning or winding the web
- B65H 23/1806: {in reel-to-reel type web winding and unwinding mechanism, e.g. mechanism acting on web-roll spindle}
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B65H: HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES

## Abstract

A conveyance apparatus includes a conveyance roller, a conveyance motor, a back tension roller, a conveyance speed detector, a brake, and a controller. The controller is configured to: based on a conveyance speed of a web detected by the conveyance speed detector, control a value of a drive control parameter of the conveyance motor such that the conveyance speed of the web is equal to a target speed; and, based on an output torque of the conveyance motor corresponding to the value of the drive control parameter, adjust a braking force of the brake applied to the back tension roller which applies a tension to the web such that the tension of the web is equal to a target tension.

## Claims

### Claim 1

A conveyance apparatus comprising:
a conveyance roller configured to convey a web and arranged downstream of an inkjet head for ejecting ink to the web in a conveyance direction of the web;
a conveyance motor configured to drive the conveyance roller;
a back tension roller arranged upstream of the inkjet head in the conveyance direction and configured to apply a tension to the web;
a conveyance speed detector configured to detect a conveyance speed of the web;
a brake configured to apply a braking force to the back tension roller; and
a controller configured to control the conveyance motor and the brake,
wherein the controller is configured to
based on the conveyance speed of the web detected by the conveyance speed detector, control a value of a drive control parameter of the conveyance motor such that the conveyance speed of the web is equal to a target speed, and
based on an output torque of the conveyance motor corresponding to the value of the drive control parameter, adjust the braking force of the brake such that the tension of the web is equal to a target tension.

### Claim 2 (depends on 1)

The conveyance apparatus according to claim 1, wherein
the brake comprises:
a base brake configured to generate a base braking force; and
an adjustment brake with a maximum output smaller than a maximum output of the base brake and with a response speed higher than a response speed of the base brake, and
the controller is configured to adjust the braking force of the brake by adjusting a braking force of the adjustment brake.

### Claim 3 (depends on 1)

The conveyance apparatus according to claim 1, wherein, depending on a type and a size of the web, instead of adjusting the braking force of the brake such that the tension of the web is equal to the target tension, the controller is configured to control the braking force of the brake such that the braking force of the brake is maintained constant at a braking force predetermined depending on the type and the size of the web.

### Claim 4 (depends on 2)

The conveyance apparatus according to claim 2, wherein, depending on a type and a size of the web, instead of adjusting the braking force of the brake such that the tension of the web is equal to the target tension, the controller is configured to control the braking force of the brake such that the braking force of the brake is maintained constant at a braking force predetermined depending on the type and the size of the web.

### Claim 5 (depends on 2)

The conveyance apparatus according to claim 2, wherein the base braking force is a constant force predetermined depending on a type and a size of the web.

### Claim 6 (depends on 3)

The conveyance apparatus according to claim 3, wherein the base braking force is a constant force predetermined depending on the type and the size of the web.

### Claim 7 (depends on 4)

The conveyance apparatus according to claim 4, wherein the base braking force is a constant force predetermined depending on the type and the size of the web.