Layer transfer device

1. A layer transfer device for transferring a foil layer of a multilayer film onto an image formed on a sheet, the layer transfer device comprising:

a heating member configured to contact and heat the multilayer film and extending along a width direction of the multilayer film, the width direction being orthogonal to a direction of conveyance of the multilayer film;

a first heater configured to heat a first portion of the heating member more intensively than a second portion of the heating member, the first portion and the second portion being arranged side by side along the width direction;

a second heater configured to heat the second portion more intensively than the first portion; and

a controller,

wherein, during transfer of the foil layer, the controller is configured to:

control the first heater with an input power set at a predetermined input power,

control the second heater with an input power set at a first input power if both of the multilayer film and the sheet pass over a surface of the second portion, and

control the second heater with an input power set at a second input power that is smaller than the first input power if at least one of the multilayer film and the sheet does not pass over the surface of the second portion.

2. The layer transfer device according to claim 1 , wherein the controller is configured to:

make a determination, upon receipt of a first signal, that the multilayer film passes over the surface of the second portion, and

make a determination, upon receipt of a second signal, that the multilayer film does not pass over the surface of the second portion.

3. The layer transfer device according to claim 2 , further comprising a film sensor capable of detecting whether or not the multilayer film passes over the surface of the second portion,

wherein the film sensor is configured to:

output the first signal to the controller when the multilayer film is held in the layer transfer device in such a manner that the multilayer film faces both of the first portion and the second portion, and

output the second signal to the controller when the multilayer film is held in the layer transfer device in such a manner that the multilayer film does not face the second portion and faces the first portion.

4. The layer transfer device according to claim 3 , wherein the layer transfer device is configured such that a first film cartridge or a second film cartridge is installable therein,

wherein the first film cartridge installed in the layer transfer device holds the multilayer film in such a manner that the multilayer film faces both of the first portion and the second portion,

wherein the second film cartridge installed in the layer transfer device holds the multilayer film in such a manner that the multilayer film does not face the second portion and faces the first portion, and

wherein the film sensor is configured to:

output the first signal to the controller when the first film cartridge is installed, and

output the second signal to the controller when the second film cartridge is installed.

5. The layer transfer device according to claim 3 , comprising a sheet sensor located upstream of the heating member in a direction of conveyance of the sheet and configured to be capable of detecting whether or not the sheet passes over the surface of the second portion.

6. The layer transfer device according to claim 5 , wherein the controller is configured to:

start control over the second heater, upon receipt of the first signal from the film sensor, with the input power set at the first input power before starting conveyance of the sheet, and

switch the control over the second heater from control with the input power set at the first input power to control with the input power set at the second input power, if a signal indicating that the sheet does not pass over the surface of the second portion is received from the sheet sensor after starting the conveyance of the sheet.

7. The layer transfer device according to claim 5 , wherein the controller is configured to start control over the second heater, upon receipt of the second signal from the film sensor, with the input power set at the second input power before starting conveyance of the sheet.

8. The layer transfer device according to claim 5 , wherein the controller is configured such that:

after the second heater is controlled with the input power set at the second input power based on a determination that the multilayer film passes over the surface of the second portion, and a determination that a downstream part of the sheet in the direction of conveyance of the sheet does not pass over the surface of the second portion, if a determination is made that an upstream part of the sheet, of which the downstream part determined not to pass over the surface of the second portion in the direction of conveyance of the sheet, passes over the surface of the second portion, then the control over the second heater is switched from control with the input power set at the second input power to control with the input power set at the first input power.

9. The layer transfer device according to claim 5 , wherein the controller is configured such that:

if a determination is made that the multilayer film passes over the surface of the second portion, and that the sheet does not pass over the surface of the second portion, the input power to the second heater is set at the second input power,

if a determination is made after setting the input power to the second heater at the second input power that another sheet, conveyed after the transfer of the foil layer on the sheet is finished, does not pass over the surface of the second portion, conveyance of a next sheet succeeding the another sheet is started before conveyance of the another sheet ends, and

if a determination is made after setting the input power to the second heater at the second input power that the another sheet passes over the surface of the second portion, the conveyance of the next sheet succeeding the another sheet is prohibited from starting before the conveyance of the another sheet ends.

10. The layer transfer device according to claim 1 , wherein the first portion is a portion of the heating member located in a midsection thereof in the width direction, and

the second portion are the portions of the heating member adjacent to both ends thereof in the width direction.

11. The layer transfer device according to claim 1 , wherein the heating member is a roller.

12. A layer transfer device for transferring a layer of a multilayer film onto an image formed on a sheet, the layer transfer device comprising:

a heating member configured to contact and heat the multilayer film and extending along a width direction of the multilayer film, the width direction being orthogonal to a direction of conveyance of the multilayer film;

a first heater configured to heat a first portion of the heating member more intensively than a second portion of the heating member, the first portion and the second portion being arranged side by side along the width direction;

a second heater configured to heat the second portion more intensively than the first portion; and

a controller,

wherein, during transfer of the layer, the controller is configured to:

make a determination, upon receipt of a first signal, that the multilayer film passes over a surface of the second portion,

make a determination, upon receipt of a second signal, that the multilayer film does not pass over the surface of the second portion,

control the first heater with an input power set at a predetermined input power,

control the second heater with an input power set at a first input power if both of the multilayer film and the sheet pass over the surface of the second portion, and

control the second heater with an input power set at a second input power that is smaller than the first input power if at least one of the multilayer film and the sheet does not pass over the surface of the second portion.

13. The layer transfer device according to claim 12 , wherein, if the controller makes a determination based on the second signal that the multilayer film does not pass over the surface of the second portion, the controller controls the second heater with an input power set at the second input power.

14. The layer transfer device according to claim 12 , further comprising a film sensor capable of detecting whether or not the multilayer film passes over the surface of the second portion,

wherein the film sensor is configured to:

output the first signal to the controller when the multilayer film is held in the layer transfer device in such a manner that the multilayer film faces both of the first portion and the second portion, and

output the second signal to the controller when the multilayer film is held in the layer transfer device in such a manner that the multilayer film does not face the second portion and faces the first portion.

15. The layer transfer device according to claim 14 , wherein the layer transfer device is configured such that a first film cartridge or a second film cartridge is installable therein,

wherein the first film cartridge installed in the layer transfer device holds the multilayer film in such a manner that the multilayer film faces both of the first portion and the second portion,

wherein the second film cartridge installed in the layer transfer device holds the multilayer film in such a manner that the multilayer film does not face the second portion and faces the first portion, and

wherein the film sensor is configured to:

output the first signal to the controller when the first film cartridge is installed, and

output the second signal to the controller when the second film cartridge is installed.

16. The layer transfer device according to claim 14 , comprising a sheet sensor located upstream of the heating member in a direction of conveyance of the sheet and configured to be capable of detecting whether or not the sheet passes over the surface of the second portion.

17. The layer transfer device according to claim 16 , wherein the controller is configured to:

start control over the second heater, upon receipt of the first signal from the film sensor, with the input power set at the first input power before starting conveyance of the sheet, and

switch the control over the second heater from control with the input power set at the first input power to control with the input power set at the second input power, if a signal indicating that the sheet does not pass over the surface of the second portion is received from the sheet sensor after starting the conveyance of the sheet.

18. The layer transfer device according to claim 16 , wherein the controller is configured to start control over the second heater, upon receipt of the second signal from the film sensor, with the input power set at the second input power before starting conveyance of the sheet.

19. The layer transfer device according to claim 16 , wherein the controller is configured such that:

after the second heater is controlled with the input power set at the second input power based on a determination that the multilayer film passes over the surface of the second portion, and a determination that a downstream part of the sheet in the direction of conveyance of the sheet does not pass over the surface of the second portion, if a determination is made that an upstream part of the sheet, of which the downstream part determined not to pass over the surface of the second portion in the direction of conveyance of the sheet, passes over the surface of the second portion, then the control over the second heater is switched from control with the input power set at the second input power to control with the input power set at the first input power.

20. The layer transfer device according to claim 16 , wherein the controller is configured such that:

if a determination is made that the multilayer film passes over the surface of the second portion, and that the sheet does not pass over the surface of the second portion, the input power to the second heater is set at the second input power,

if a determination is made after setting the input power to the second heater at the second input power that another sheet, conveyed after the transfer of the layer on the sheet is finished, does not pass over the surface of the second portion, conveyance of a next sheet succeeding the another sheet is started before conveyance of the another sheet ends, and

if a determination is made after setting the input power to the second heater at the second input power that the another sheet passes over the surface of the second portion, the conveyance of the next sheet succeeding the another sheet is prohibited from starting before the conveyance of the another sheet ends.