Foil transfer device

Abstract

To prevent a cover from being locked for an unnecessarily long time.SOLUTION: A foil transfer device of the invention includes: an openable / closable cover; a lock mechanism: a heating member; a pressurizing member; a temperature sensor; and a control unit. The locking mechanism can lock the cover in a closed position. The control unit calculates a value obtained by adding a first correction value A determined from conditions for performing foil transfer to a detection temperature T detected by the temperature sensor as a first lock determination temperature T1, and controls the lock mechanism to lock the cover when the first lock determination temperature T1 is equal to or more than a first threshold value. The control unit calculates a value obtained by adding a second correction value B that is determined from conditions for performing foil transfer and is different from the first correction value A, to a detection temperature T detected by the temperature sensor as a second lock determination temperature T2, and controls the lock mechanism to release the lock of the cover when the second lock determination temperature T2 is less than a second threshold value.SELECTED DRAWING: Figure 10

Description

[Technical field]

[0001] The present invention relates to a foil transfer device for transferring a foil onto a sheet. [Background technology]

[0002] Conventionally, a foil transfer device is known that includes a supply reel on which a foil film is wound, a take-up reel for taking up the foil film, a heating roller for heating the foil film and the sheet, and a pressure roller for sandwiching the foil film and the sheet between the heating roller (see Patent Document 1). This foil transfer device has a cover that can be opened to replace the foil film or remove a jammed sheet. After foil transfer is performed, this cover is locked and cannot be opened if the internal temperature is equal to or higher than a threshold value. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-121788 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the prior art, the operating conditions of the foil transfer device are not taken into consideration when determining the locking and unlocking conditions. In such cases, it is common to adopt the strictest locking conditions of all conditions for safety reasons. In this case, depending on the operating conditions of the foil transfer device, the cover may not be unlocked even though it is possible to unlock it. This may result in the cover remaining locked for an unnecessarily long time, reducing user convenience.

[0005] Therefore, an object of the present invention is to prevent the cover from remaining in the locked state for an unnecessarily long period of time. [Means for solving the problem]

[0006] A foil transfer device for solving the above problem is a device for overlaying a sheet on a foil film containing foil to transfer the foil to the sheet, and includes a housing main body having an opening, a cover, a locking mechanism, a heating member, a pressure member, a temperature sensor, and a control unit. The cover is movable between a closed position that closes the opening and an open position that opens the opening. The locking mechanism is capable of locking the cover in the closed position. The heating member heats the foil film and the sheet. The pressure member sandwiches the foil film and the sheet between the heating member and the pressure member. The control unit calculates a first locking determination temperature by adding a first correction value determined from the conditions for performing foil transfer to the detected temperature detected by the temperature sensor, and if the first locking determination temperature is equal to or higher than a first threshold value, controls the locking mechanism to lock the cover. The control unit calculates a second lock determination temperature by adding the detected temperature detected by the temperature sensor to a second correction value determined from conditions for performing foil transfer, the second correction value being different from the first correction value, and if the second lock determination temperature is less than a second threshold value, controls the locking mechanism to unlock the cover.

[0007] According to this configuration, the first lock judgment temperature, which is the criterion for locking the cover, and the second lock judgment temperature, which is the criterion for unlocking the cover, are determined by adding different correction values. Therefore, the conditions for locking and unlocking the cover are appropriately calculated for the conditions for performing foil transfer. As a result, the cover is prevented from being locked for an unnecessarily long time, improving user convenience.

[0008] In addition, in the above-mentioned configuration, the foil transfer device may be capable of mounting either a first foil film which is a foil film of a first width, a second foil film which is a foil film of a second width narrower than the first width and is mounted in a central region in the width direction of the area where the first foil film is mounted, or a third foil film which is a foil film of the second width and is mounted in a region shifted to one side in the width direction of the area where the first foil film is mounted, the temperature sensor may be located in the width direction within the area where both the second foil film and the third foil film are mounted, and closer to the edge of the second foil film than the center of the second foil film, and the first correction value and the second correction value may be determined to be larger when the second foil film is mounted than when the first foil film is mounted, and determined to be larger when the third foil film is mounted than when the first foil film is mounted and smaller than when the second foil film is mounted.

[0009] According to this configuration, the first and second correction values ​​are determined to values ​​corresponding to the attached first, second or third foil film, so that the cover lock and unlock are appropriately calculated, respectively. As a result, the cover lock state is prevented from being unnecessarily long, improving user convenience.

[0010] In the above-described configuration, the first correction value may be determined to be a larger value when the sheet width is a first width than when the sheet width is a second width larger than the first width.

[0011] According to this configuration, the first correction value is determined to a value according to the sheet width, so that the cover lock and unlock states are each appropriately calculated. As a result, the cover lock state is prevented from being unnecessarily long, improving user convenience.

[0012] In the above-described configuration, the first correction value may be determined to be larger when the sheet has a first thickness than when the sheet has a second thickness that is thicker than the first thickness.

[0013] According to this configuration, the first correction value is determined to a value corresponding to the thickness of the sheet, so that the cover lock and unlock states are appropriately calculated. As a result, the cover lock state is prevented from being unnecessarily long, improving user convenience.

[0014] In addition, in the above-mentioned configuration, the control unit can execute a normal mode in which a foil film is brought into contact with the entire area of ​​the sheet in the conveying direction of the sheet to perform transfer, and a foil save mode in which a foil film is brought into contact with a partial area of ​​the sheet in the conveying direction to perform transfer, and the first correction value and the second correction value may be determined to be larger values ​​when the foil save mode is executed than when the normal mode is executed.

[0015] According to this configuration, the first and second correction values ​​are determined to correspond to the normal mode or the foil saving mode, so that the cover lock and unlock states are calculated appropriately. As a result, the cover lock state is prevented from being unnecessarily long, improving user convenience.

[0016] In the above-described configuration, the first threshold value may be greater than the second threshold value.

[0017] In the above-mentioned configuration, the first threshold value may be a temperature that is 5 to 15° C. higher than the second threshold value.

[0018] According to this configuration, by providing a gap of 5 to 15° C. between the first threshold value and the second threshold value, it is possible to prevent the cover from being locked and unlocked repeatedly too frequently.

[0019] The foil transfer device may further include a contact / separation mechanism that moves the heating member between a pressure-contact position where the heating member is pressed against the pressure member and a separated position where the heating member is separated from the pressure member, and a shutter that is linked to the operation of the contact / separation mechanism and is positioned at a first position between the heating member and the pressure member and covers the heating member when the heating member is in the separated position, and is positioned at a second position different from the first position when the heating member is in the pressure-contact position, and the control unit may be configured to control the locking mechanism to lock the cover when the shutter is in the second position, and not unlock the cover regardless of the temperature detected by the temperature sensor.

[0020] According to this configuration, the cover is unlocked only when the shutter is in the first position covering the heating member, so that it is possible to prevent the user from touching the heating member.

[0021] In addition, the foil transfer device may further include a metal plate facing the heating member, extending in the width direction of the foil film and positioned downstream of the heating member in the conveying direction, and the temperature sensor may be arranged on the metal plate.

[0022] According to this configuration, the temperature sensor can detect a temperature corresponding to the state of the heating member.

[0023] A foil transfer device for solving the above problem is a device for overlaying a sheet on a foil film containing foil to transfer the foil to the sheet, and includes a housing main body having an opening, a cover, a locking mechanism, a heating member, a pressure member, a temperature sensor, and a control unit. The cover is movable between a closed position that closes the opening and an open position that opens the opening. The locking mechanism is capable of locking the cover in the closed position. The heating member heats the foil film and the sheet. The pressure member sandwiches the foil film and the sheet between the heating member and the pressure member. The control unit locks the cover when the temperature detected by the temperature sensor is equal to or greater than a value obtained by subtracting a third correction value determined from the conditions for performing foil transfer from a third threshold value. The control unit detects that the detected temperature detected by the temperature sensor is a value obtained by subtracting a fourth correction value determined based on the conditions for performing the foil transfer from a fourth threshold value. less than If so, unlock the cover.

[0024] According to this configuration, the criterion value for locking the cover and the criterion value for unlocking the cover are determined by subtracting different correction values ​​from the respective threshold values. Therefore, the cover lock and unlock are appropriately calculated for the conditions for performing foil transfer. As a result, the cover lock state is prevented from being unnecessarily long, improving user convenience.

[0025] In the above-mentioned configuration, the heating member may be a rotatable heating roller.

[0026] In the above-mentioned configuration, the pressure member may be a rotatable pressure roller.

[0027] Furthermore, in the above-described configuration, the locking mechanism may be configured to include a locking lever that can swing between a locked position, in which the cover is locked in the closed position, and an unlocked position, in which the cover is not locked, and a swing restricting member that can move between a restricting position, in which the locking lever is restricted from swinging from the locked position to the unlocked position, and an unlocked position, in which the locking lever is not restricted from swinging from the locked position to the unlocked position. Effect of the Invention

[0028] According to the present invention, it is possible to prevent the cover from remaining in the locked state for an unnecessarily long period of time. [Brief description of the drawings]

[0029] [Figure 1] 1 is a diagram showing a foil transfer device according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a diagram showing the foil transfer device with the cover open. [Diagram 3]FIG. 1 is a perspective view showing a first film cartridge (a), a second film cartridge (b), and a third film cartridge (c). [Figure 4] (a) is a diagram showing three film sensors, and (b) is a table showing the detection results of each sensor. [Diagram 5] FIG. 2 is a top view of the foil transfer device, illustrating the positions of the foil film and each sheet sensor. [Figure 6] 1A is a side view showing the structure around the lock lever, in which FIG. 1A shows the state in which the lock lever is restricted to the locked position, FIG. 1B shows the state in which the lock lever is not restricted, and FIG. 1C shows the state in which the lock lever is swung to the unlocked position. [Figure 7] FIG. [Figure 8] FIG. 2 is a perspective view showing a heating unit. [Figure 9] 1A is a diagram illustrating the shutter and the interlocking mechanism when the heating roller is in the pressure contact position, and FIG. 1B is a diagram illustrating the shutter and the interlocking mechanism when the heating roller is in the separated position. [Figure 10] 11 is a graph illustrating the relationship between the detected temperature plus a first correction value and the timing at which the cover is locked, and the relationship between the detected temperature plus a second correction value and the timing at which the cover is unlocked. [Figure 11] 1 is a table showing first and second correction values ​​corresponding to different types of foil films. [Figure 12] Table (a) shows the first and second correction values ​​corresponding to the sheet width, table (b) shows the first and second correction values ​​corresponding to the sheet thickness, and table (c) shows the first and second correction values ​​corresponding to the foil transfer mode. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] Next, an embodiment of the present invention will be described with reference to the drawings. An embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the overall configuration of a foil transfer device will be briefly described first, and then the configuration of the characteristic portion of the present invention will be described. In the following description, directions will be described in terms of the directions shown in Fig. 1. That is, the right side of Fig. 1 will be referred to as "front", the left side of Fig. 1 will be referred to as "rear", the front side of the paper in Fig. 1 will be referred to as "left", and the back side of the paper in Fig. 1 will be referred to as "right". Additionally, the top and bottom of Fig. 1 will be referred to as "top and bottom".

[0031] 1, foil transfer device 1 is a device for transferring a foil such as gold foil onto a toner image formed on sheet S by an image forming device such as a laser printer. In other words, foil transfer device 1 forms a foil image on sheet S by transferring foil onto the toner image on sheet S. Foil transfer device 1 includes a housing 2, a sheet tray 3, a sheet conveying unit 10, a film supply unit 30, a transfer unit 50, and a control unit 100.

[0032] The housing 2 is made of resin or the like, and includes a housing body 21 and a cover 22. The housing body 21 has an opening 21A (see FIG. 2) at the top. The opening 21A is an opening for attaching and detaching a film unit FU, which will be described later, to the housing body 21. The cover 22 is a member for opening and closing the opening 21A. A rear end portion of the cover 22 is rotatably supported by the housing body 21. The cover 22 is rotatable between a closed position (position in FIG. 1) in which the opening 21A is closed, and an open position (position in FIG. 2) in which the opening 21A is opened.

[0033] The foil transfer device 1 includes a locking mechanism 8 that locks the cover 22 in the closed position. The locking mechanism 8 will be described in detail later.

[0034] The sheet tray 3 is a tray on which sheets S, such as paper and overhead projector films, are placed. The sheet tray 3 is provided at the rear of the housing 2. The sheet S is placed on the sheet tray 3 with the surface on which the toner image is formed facing downward.

[0035] The sheet conveying section 10 includes a sheet supply mechanism 11 and a sheet discharge mechanism 12. The sheet supply mechanism 11 is a mechanism that conveys the sheets S on the sheet tray 3 one by one toward the transfer section 50. The sheet supply mechanism 11 includes a pickup roller 11A and a conveying roller.

[0036] The sheet discharge mechanism 12 is a mechanism that discharges the sheet S that has passed through the transfer unit 50 to the outside of the housing 2. The sheet discharge mechanism 12 includes a plurality of transport rollers.

[0037] The film supply section 30 is a section that supplies the foil film F so as to be superimposed on the sheet S conveyed from the sheet supply mechanism 11. The film supply section 30 includes a film unit FU and a drive source such as a motor (not shown).

[0038] 2, the film unit FU is detachable from the housing main body 21 by passing through the opening 21A in a direction perpendicular to the axial direction of a supply reel 31 (described later). The film unit FU includes the supply reel 31 and a take-up reel 35. A foil film F is wound around the supply reel 31.

[0039] The foil film F is a film composed of multiple layers. More specifically, the foil film F has a support layer and a supported layer. The support layer is a tape-like transparent substrate made of a polymeric material, and supports the supported layer. The supported layer has, for example, a release layer, a transfer layer, and an adhesive layer. The release layer is a layer for facilitating peeling of the transfer layer from the support layer, and is disposed between the support layer and the transfer layer. The release layer contains a transparent material, such as a wax-based resin, that is easily peeled from the support layer.

[0040] The transfer layer is a layer to be transferred to the toner image and contains a foil. The foil is a metal such as gold, silver, copper, or aluminum that is thinly rolled out. The transfer layer also contains a coloring material such as gold, silver, or red, and a thermoplastic resin. The transfer layer is disposed between the release layer and the adhesive layer. The adhesive layer is a layer for facilitating adhesion of the transfer layer to the toner image. The adhesive layer contains a material that easily adheres to the toner image heated by the transfer unit 50 described later, such as a vinyl chloride resin or an acrylic resin.

[0041] The supply reel 31 is made of resin or the like and has a supply shaft portion 31A around which the foil film F is wound. One end of the foil film F is fixed to the supply shaft portion 31A. The foil film F is wound around the supply reel 31 with the supporting layer on the outside and the supported layer on the inside.

[0042] The take-up reel 35 is made of resin or the like, and has a take-up shaft portion 35A for taking up the foil film F. The other end of the foil film F is fixed to the take-up shaft portion 35A. The foil film F is wound around the take-up reel 35 with the supporting layer on the outside and the supported layer on the inside.

[0043] For convenience, Fig. 1 and other figures show a state in which the foil film F is wound to its maximum around both the supply reel 31 and the take-up reel 35. In reality, when the film unit FU is new, the diameter of the roll-shaped foil film F wound around the supply reel 31 is at its maximum, and either no foil film F is wound around the take-up reel 35, or the diameter of the roll-shaped foil film F wound around the take-up reel 35 is at its minimum. Also, at the end of the film unit FU's life (when the foil film F has been used up), the diameter of the roll-shaped foil film F wound around the take-up reel 35 is at its maximum, and either no foil film F is wound around the supply reel 31, or the diameter of the roll-shaped foil film F wound around the supply reel 31 is at its minimum.

[0044] With the film unit FU attached to the foil transfer device 1, the take-up reel 35 is driven to rotate counterclockwise by a drive source (not shown). When the take-up reel 35 rotates, the foil film F wound around the supply reel 31 is pulled out, and the pulled-out foil film F is taken up by the take-up reel 35. In more detail, during foil transfer, the foil film F is fed out by a pressure roller 51 and a heating roller 61 (described later), so that the foil film F is pulled out from the supply reel 31. Then, the foil film F fed out from the pressure roller 51 and the heating roller 61 is taken up by the take-up reel 35.

[0045] The transfer unit 50 is a section for transferring a transfer layer onto the toner image formed on the sheet S by applying heat and pressure to the sheet S and the foil film F in a superposed state. The transfer unit 50 includes a pressure roller 51 as an example of a pressure member, and a heating roller 61 as an example of a pressure member. The transfer unit 50 heats and presses the sheet S and the foil film F in a superposed state at a nip portion between the pressure roller 51 and the heating roller 61.

[0046] The pressure roller 51 is a roller in which the periphery of a cylindrical core metal is covered with a rubber layer made of silicone rubber. The pressure roller 51 is disposed on the upper side of the foil film F and is capable of contacting the rear surface of the sheet S (the surface opposite to the surface on which the toner image is formed).

[0047] The pressure roller 51 has both ends rotatably supported by the cover 22. The pressure roller 51 sandwiches the sheet S and the foil film F between itself and the heat roller 61, and is driven to rotate by a drive source (not shown), thereby rotating the heat roller 61.

[0048] The heating roller 61 is a rotatable roller with a heater disposed inside a cylindrical metal tube, and heats the foil film F and the sheet S. The heating roller 61 is disposed below the foil film F and is in contact with the foil film F.

[0049] In this embodiment, the heating roller 61 is moved by a contact / separation mechanism 7 for bringing the heating roller 61 into contact with and away from the foil film F. The contact / separation mechanism 7 is a mechanism for moving the heating roller 61 between a pressure contact position where the heating roller 61 is in pressure contact with the pressure roller 51 and a separated position where the heating roller 61 is separated from the pressure roller 51. When the film unit FU is attached, the heating roller 61 contacts the foil film F when the heating roller 61 is located at the pressure contact position. When the cover 22 is closed, the contact / separation mechanism 7 moves the heating roller 61 to a contact position where the heating roller 61 contacts the foil film F in accordance with the timing when the sheet S is supplied to the transfer section 50. When the cover 22 is opened or when foil transfer is not performed on the sheet S in the transfer section 50, the contact / separation mechanism 7 positions the heating roller 61 at a separated position where the heating roller 61 is separated from the foil film F.

[0050] In the foil transfer device 1 configured in this manner, the sheets S placed on the sheet tray 3 with their front surfaces facing downwards are transported one by one toward the transfer unit 50 by the sheet supply mechanism 11. The sheets S are overlapped with the foil film F supplied from the supply reel 31 on the upstream side of the transfer unit 50 in the transport direction of the sheets S (in the following description, simply referred to as the "transport direction"), and are transported to the transfer unit 50 with the toner image on the sheets S and the foil film F in contact with each other.

[0051] In the transfer section 50, when the sheet S and the foil film F pass through a nip between the pressure roller 51 and the heating roller 61, they are heated and pressed by the heating roller 61 and the pressure roller 51, and the foil is transferred onto the toner image. On the downstream side of the transfer section 50, the foil film F is peeled off from the sheet S.

[0052] The foil film F peeled off from the sheet S is taken up by the take-up reel 35. Meanwhile, the sheet S from which the foil film F has been peeled off is discharged by the sheet discharge mechanism 12 to the outside of the housing 2 with the surface on which the foil has been transferred facing down.

[0053] The control unit 100 includes a CPU, a RAM, a ROM, and an input / output circuit, and executes control by performing various arithmetic processing based on programs and data stored in the ROM etc. The operation of the control unit 100 will be described in detail later.

[0054] Here, the foil transfer device 1 is capable of mounting foil films F of a variety of widths, and is also capable of conveying sheets S of a variety of widths.

[0055] First, with reference to Figs. 3(a) to (c) and 9, the foil film F that can be attached to the foil transfer device 1 will be described. The foil transfer device 1 can mount any one of the first foil film F1, the second foil film F2, and the third foil film F3. The first foil film F1 is a foil film F having a first width H1. As shown in FIG. 5, the second foil film F2 is mounted in a central region R2 in the width direction of the region R1 in which the first foil film F1 is mounted, and is a foil film F having a second width H2 narrower than the first width H1. The third foil film F3 is mounted in a shifted region R3 toward one side (the left side in FIG. 5) in the width direction of the region R1 in which the first foil film F1 is mounted, and is a foil film F having a second width H2.

[0056] As shown in Fig. 3(a), a film unit FU to which a first film cartridge FC1 having a foil film F with a width H1 is attached is referred to as a first film unit FU1. The first width H1 is the maximum width of the foil film F that can be placed in the film unit FU, and is, for example, 220 mm. The first film unit FU1 is suitable for use with any sheet S of a transportable size, and is particularly suitable for use when foil transfer is to be performed across the entire width of a wide sheet S. The first film unit FU1 has engagement pieces P1, P2, and P3 fixed to all of the three recesses 32D formed in the outer peripheral wall 32A.

[0057] As shown in Fig. 3(b), a film unit FU having a foil film F with a width H2 and a second film cartridge FC2 with the foil film F positioned toward the center is called a second film unit FU2. The second width H2 is smaller than the first width H1, and is, for example, 110 mm. The second film unit FU2 is suitable for narrow sheets or when foil transfer is to be performed only on the central region R2 of a wide sheet, and can save foil film F (see Fig. 5). The second film unit PU2 has three recesses 32D formed in the outer wall 32A, of which two recesses 32D on the left and right sides have engagement pieces P1, P3 fixed thereto, and no engagement piece is fixed to the central recess 32D.

[0058] As shown in Figure 3(c), a film unit FU having a third film cartridge FC3 attached thereto, in which the foil film F has a width H2 and the foil film F is positioned to one side in the width direction of the foil film F, is called the third film unit FU3. The second film unit FU2 is suitable for the case where foil transfer is to be performed only on the one-side region R3 of the wide sheet S, and can save the foil film F (see FIG. 5). The third film unit PU3 has three recesses 32D formed in the outer wall 32A, of which engagement pieces P2, P3 are fixed to the central recess 32D and the recess 32D on one of the left and right sides, and no engagement piece is fixed to the other recess 32D on the left or right side.

[0059] 4(a), the foil transfer device 1 is provided with a foil film sensor that detects the width of the foil film F. The foil film sensor has three sensors: a first sensor AS1, a second sensor AS2, and a third sensor AS3.

[0060] The first sensor AS1, the second sensor AS2, and the third sensor AS3 are positioned at positions corresponding to three recesses 32D formed in the outer wall 32A of the supply case 32 when the film unit FU is attached to the housing main body 21. The first sensor AS1 sends a signal indicating LOW to the control unit 100 when it detects the engagement piece P1 of the film unit FU, and sends a signal indicating HIGH to the control unit 100 when it does not detect the engagement piece P1. The second sensor AS2 sends a signal indicating LOW to the control unit 100 when it detects the engagement piece P2 of the film unit FU, and sends a signal indicating HIGH to the control unit 100 when it does not detect the engagement piece P2. The third sensor AS3 sends a signal indicating LOW to the control unit 100 when it detects the engagement piece P3 of the film unit FU, and sends a signal indicating HIGH to the control unit 100 when it does not detect the engagement piece P3.

[0061] By receiving signals from the first sensor AS1, the second sensor AS2, and the third sensor AS3, the control unit 100 can determine whether the first film unit FU1, the second film unit FU2, or the third film unit FU3 is attached to the housing main body 21.

[0062] Specifically, as shown in the table in Figure 4(b), when the signals from the first sensor AS1, the second sensor AS2, and the third sensor AS3 are all LOW, the control unit 100 determines that the first film unit FU1 is attached to the housing main body 21. In addition, the control unit 100 determines that the second film unit FU2 is attached to the main housing 21 when the signals from the first sensor AS1 and the third sensor AS3 are LOW and the signal from the second sensor AS2 is HIGH. Furthermore, when the signals from the second sensor AS2 and the third sensor AS3 are LOW and the signal from the first sensor AS1 is HIGH, the control unit 100 determines that the third film unit FU3 is attached to the main housing 21. Furthermore, if the signals from the first sensor AS1, the second sensor AS2 and the third sensor AS3 are all HIGH, the control unit 100 determines that none of the first film unit FU1, the second film unit FU2 or the third film unit FU3 is attached to the housing main body 21.

[0063] Next, a case where sheets of different widths are placed on the foil transfer device 1 will be described with reference to Fig. 5. As shown in Fig. 5, the foil transfer device 1 has a first sheet sensor SS1 and a sheet width sensor SS4.

[0064] 1, the first sheet sensor SS1 is located between the pickup roller 11A and the transfer unit 50 in the conveying direction. The first sheet sensor SS1 is located at the center C in the width direction (left-right direction in FIG. 5) of the sheet S (see FIG. 5). The first sheet sensor SS1 can detect the passage of the sheet S conveyed toward the transfer unit 50. While the first sheet sensor SS1 is detecting the sheet S, an ON signal is sent to the control unit 100.

[0065] The sheet width sensor SS4 is located between the pickup roller 11A and the transfer unit 50 in the conveying direction. As shown in Fig. 5, the sheet width sensor SS4 can detect the sheet S conveyed toward the transfer unit 50 and passing through the shifting area. In this embodiment, the sheet width sensor SS4 is located in the shifting area R3, and is located slightly upstream in the conveying direction from the first sheet sensor SS1. The sheet width sensor SS4 is disposed to one side from the center C in the width direction of the sheet S (the left-right direction in Fig. 5). While the sheet width sensor SS4 is detecting the sheet S, an ON signal is sent to the control unit 100.

[0066] In this embodiment, the sheet width sensor SS4 is disposed at a position 75 to 77 mm away from the center C to the left in FIG. The sheet width sensor SS4 can detect the sheet S1 when the sheet S1 having a width larger than the A5 size (width 148.5 mm) is conveyed centered. When the sheet S2 having a width equal to or smaller than A5 size (width 148.5 mm) is conveyed centered, the sheet width sensor SS4 cannot detect the sheet S2.

[0067] Here, the lock mechanism 8 that locks the cover 22 will be described in detail. 6(a), the lock mechanism 8 has a lock lever 81, an actuator 91, a swing restriction member 92, and a lock pin RP. In this embodiment, the lock lever 81 is located at the front end of the cover 22, and the actuator 91, the swing restriction member 92, and the lock pin RP are located in the housing main body 21 (see FIG. 2).

[0068] The lock lever 81 is capable of swinging between a lock position (see FIG. 6(a)) where the cover 22 is locked in the closed position, and an unlock position (see FIG. 6(c)) where the cover 22 is not locked.

[0069] As shown in Fig. 7, the lock levers 81 are provided on both ends of a cylindrical shaft 82. The shaft 82 is rotatably supported by the cover 22. A handle 83 that is operated by a user is provided at the center of the shaft 82 in the axial direction. Each lock lever 81 and the handle 83 are fixed to the shaft 82. As a result, when the user rotates the handle 83, each lock lever 81 rotates together with the shaft 82.

[0070] 6(a), the tip of the lock lever 81 is hook-shaped and can be engaged with the lock pin RP. When the cover 22 is in the closed position, the lock lever 81 can move between a locked position (position in FIG. 6(a)) where it can be engaged with the lock pin RP, and an unlocked position (position in FIG. 6(c)) where it is disengaged from the lock pin RP.

[0071] The swing restricting member 92 is movable between a restricting position shown in Fig. 6(a) and non-restricting positions shown in Fig. 6(b) and (c). As shown in Fig. 6(a), the swing restricting member 92 comes into contact with the lock lever 81 at the restricting position, thereby restricting the lock lever 81 from swinging from the locked position to the non-locked position.

[0072] Furthermore, as shown in FIGS. 6(b) and 6(c), when in the non-restrictive position, the swing restriction member 92 is separated from the lock lever 81 and does not restrict the lock lever 81 from swinging from the locked position to the non-locked position.

[0073] The actuator 91 is for sliding the swing restricting member 92 between a restricting position and a non-restricting position.

[0074] Here, the heating unit 6 having the heating roller 61 will be described in detail. 1, the heating roller 61 is supported by the heating unit 6 so as to be rotatable and movable up and down. The heating unit 6 is disposed between the supply reel 31 and the take-up reel 35 in the transport direction. The heating unit 6 has a contact / separation mechanism 7, a fixed frame 60, a shutter 62, an interlocking mechanism 63, a temperature sensor 66, and a metal plate 67.

[0075] The contact / separation mechanism 7 has a movable frame 70 and a cam 73. The movable frame 70 is a member that directly supports the heating roller 61. The movable frame 70 is slidably guided by a guide portion (not shown) of the fixed frame 60. The cam 73 is a member that moves the movable frame 70 up and down by rotating.

[0076] 8, the fixed frame 60 constitutes the outer frame of the heating unit 6 and is a frame that supports the contact / separation mechanism 7. The fixed frame 60 is fixed to the housing main body 21.

[0077] The shutter 62 is slidably supported by a shutter guide 65 described later, and is movable between a first position shown in Fig. 9(b) and a second position shown in Fig. 9(a). The shutter 62 moves between the first and second positions in conjunction with the operation of the contact / separation mechanism 7.

[0078] As shown in FIG. 9(b), the first position is a position between the heating roller 61 and the pressure roller 51 that covers the heating roller 61 when the heating roller 61 is in the separated position. The second position, as shown in FIG. 9(a), is a position different from the first position, and is a position where the shutter 62 retreats to the upstream side in the transport direction when the heating roller 61 is in the pressure contact position.

[0079] The interlocking mechanism 63 is a mechanism that moves the shutter 62 in conjunction with the movement of the movable frame 70. Specifically, as shown in Fig. 9, when the movable frame 70 moves from the first position to the second position, the interlocking mechanism 63 moves the shutter 62 from the open position to the closed position. Also, as shown in Fig. 8, when the movable frame 70 moves from the second position to the first position, the interlocking mechanism 63 moves the shutter 62 from the closed position to the open position.

[0080] The interlocking mechanism 63 has a link 64 and a shutter guide 65. The link 64 is supported by the fixed frame 60 so as to be able to swing. The link 64 can swing between a third position shown in FIG. 9(a) and a fourth position shown in FIG. 9(b). The link 64 has a swing shaft 64A, an arm 64B, and an elongated hole 64H. The link 64 is always biased by a torsion spring (not shown) toward the fourth position, that is, in the direction in which the shutter 62 is closed.

[0081] The swing shaft 64A is supported by the fixed frame 60 and is an axis about which the link 64 swings. The arm 64B is a portion that comes into contact with the protrusion 70D of the movable frame 70. The shaft 62S of the shutter 62 fits into the elongated hole 64H.

[0082] The shutter guide 65 is fixed to the fixed frame 60, and has an elongated hole 65H. The elongated hole 65H guides the movement of the shaft 62S of the shutter 62.

[0083] The metal plate 67 is located downstream of the heating roller 61 in the transport direction. The metal plate 67 is a metal plate, and is fixed to the fixed frame 60. The metal plate 67 extends in the width direction of the foil film F (in the following description, simply referred to as the "width direction"). The metal plate 67 faces the heating roller 61.

[0084] The temperature sensor 66 is disposed on the lower surface of the metal plate 67. That is, the temperature sensor 66 is disposed on the surface of the metal plate 67 on the heating roller 61 side. As shown in Fig. 5, the temperature sensor 66 is located in the width direction (left-right direction in Fig. 5) within the area where the second foil film F2 and the third foil film F3 are both attached (the area where R2 and R3 overlap), and is located closer to the end of the second foil film F2 (the left end of R2 in Fig. 5) than the center C of the second foil film F2. The temperature sensor 66 is located closer to the sheet width sensor SS4 than the first sheet sensor SS1 in the width direction.

[0085] Next, a case where the control unit 100 controls the lock mechanism 8 to lock the cover 22 (lock ON) and a case where the control unit 100 releases the lock (lock OFF) will be described. When the cover 22 is locked, the user cannot open the cover 22, and when the cover is released, the user can open the cover 22 by rotating the handle 83.

[0086] When the shutter 62 is located at the second position, the control unit 100 controls the locking mechanism 8 to lock the cover 22, and does not unlock the cover 22 regardless of the detected temperature T detected by the temperature sensor 66. As described above, the shutter 62 is located at the second position in conjunction with the operation of the contact / separation mechanism 7, so that when the shutter 62 is located at the second position, the heating roller 61 is located at the pressure contact position. That is, the shutter 62 is located at the second position when the heating roller 61 is located at the pressure contact position. In this case, since foil transfer is being performed, the control unit 100 does not unlock the cover 22.

[0087] Here, in FIG. 10, the detected temperature T detected by the temperature sensor 66 is indicated by a solid line. As shown in FIG. 10, the control unit 100 calculates a first lock determination temperature T1 (indicated by a dashed line in FIG. 10) by adding a first correction value A determined from the conditions for performing foil transfer to the detected temperature T detected by the temperature sensor 66 (T1=T+A). When the first lock determination temperature T1 is equal to or higher than the first threshold value, the control unit 100 controls the lock mechanism 8 to lock the cover 22. The first correction value A is a value that is determined in advance by experimental results according to the operating conditions of the foil transfer device 1. The first threshold value is a value that is determined in advance according to the specifications of the foil transfer device 1. The first threshold value is, for example, 85°C.

[0088] Furthermore, the control unit 100 calculates a second lock determination temperature T2 (T2=T+B) by adding a second correction value B (shown by a dashed line in FIG. 10) determined from the conditions for performing foil transfer to the detected temperature T detected by the temperature sensor 66, and if the second lock determination temperature T2 is less than the second threshold value, controls the lock mechanism 8 to unlock the cover 22. The second correction value B is a value that is determined in advance from experimental results depending on the operating conditions of the foil transfer device 1, and is a value different from the first correction value A.

[0089] The first threshold is a value greater than the second threshold. The first threshold is a temperature that is 5 to 15° C. higher than the second threshold. The second threshold is, for example, 75° C.

[0090] The control unit 100 changes the first correction value A and the second correction value B depending on the type of foil film F attached to the foil transfer device 1, the width of the sheet S, the thickness of the sheet S, the selected foil transfer mode, etc. The control unit 100 determines the values ​​according to a table that is determined in advance based on the results of experiments, for example, as shown in Figs. 11 and 12.

[0091] Specifically, as shown in FIG. 11, when the first foil film F1 is attached to the foil transfer device 1, the control unit 100 sets the first correction value A to A1 and the second correction value B to B1. When the second foil film F2 is attached to the foil transfer device 1, the control unit 100 sets the first correction value A to A2, which is a value larger than A1, and sets the second correction value B to B2, which is a value larger than B1. That is, when the second foil film F2 is attached, the first correction value A and the second correction value B are determined to be larger values ​​than when the first foil film F1 is attached (A2>A1, B2>B1). When the third foil film F3 is attached to the foil transfer device 1, the control unit 100 sets the first correction value A to A3, which is a value larger than A1 and smaller than A2, and sets the second correction value B to B3, which is a value larger than B1 and smaller than B2. That is, when the third foil film F3 is attached, the first correction value A and the second correction value B are determined to be values ​​larger than when the first foil film F1 is attached and smaller than when the second foil film F2 is attached (A2>A3>A1, B2>B3>B1).

[0092] In this embodiment, by receiving signals from the first sensor AS1, the second sensor AS2, and the third sensor AS3, it is possible to determine which of the first film unit FU1, the second film unit FU2, or the third film unit FU3 is attached to the housing main body 21, so that the first correction value A and the second correction value B can be determined without the user having to input the width of the foil film F.

[0093] 12(a), when a sheet S of a first width is loaded in the foil transfer device 1, the control unit 100 sets the first correction value A to A4 and the second correction value B to B4. When a sheet S of a second width larger than the first width is loaded in the foil transfer device 1, the control unit 100 sets the first correction value A to A5, which is a value smaller than A4, and sets the second correction value B to B5. That is, when the width of the sheet S is the first width, the first correction value A is determined to be a value A4 larger than when the width of the sheet S is the second width larger than the first width (A4>A5). In this embodiment, the second correction values ​​B4 and B5 are the same value (B4=B5).

[0094] In this embodiment, the first width sheet is A5 size (width 148.5 mm), and the second width sheet is A4 size (width 210 mm). In this embodiment, when the sheet is centered, the control unit 100 can determine whether the sheet is smaller than A5 size or larger than A5 size based on the signal sent from the sheet width sensor SS4, so that the first correction value A and the second correction value B can be determined without the user having to input the width of the sheet S.

[0095] 12(b), when a sheet S having a first thickness is attached to the foil transfer device 1, the control unit 100 sets the first correction value A to A6 and the second correction value B to B6. When a sheet S having a second thickness that is thicker than the first thickness is attached to the foil transfer device 1, the control unit 100 sets the first correction value A to A7, which is a value smaller than A6, and sets the second correction value B to B7. That is, when the thickness of the sheet S is the first thickness, the first correction value A is determined to be a value A6 larger than when the thickness of the sheet S is the second thickness that is larger than the first thickness (A6>A7). In this embodiment, the second correction values ​​B6 and B7 are the same value (B6=B7).

[0096] The control unit 100 can execute a normal mode in which the foil film F contacts the entire area of ​​the sheet S in the conveying direction to perform the transfer, and a foil save mode in which the foil film F contacts a partial area of ​​the sheet S in the conveying direction to perform the transfer. The normal mode includes a case in which the foil film F is pressed against the sheet S only in a partial area of ​​the sheet S in the width direction.

[0097] 12(c), when the control unit 100 executes the normal mode, the first correction value A is set to A8, and the second correction value B is set to B8. When the control unit 100 executes the foil transfer mode, the first correction value A is set to A9, which is larger than A8, and the second correction value B is set to B9, which is larger than B8. That is, when the control unit 100 executes the foil save mode, the first correction value A and the second correction value B are determined to be values ​​A9 and B9, which are larger than when the normal mode is executed.

[0098] When determining the first correction value A and the second correction value B, if there are a plurality of operating conditions among the operating conditions such as the type of foil film F mounted on the foil transfer device 1, the width of the sheet S, the thickness of the sheet S, and the selected foil transfer mode, the control unit 100 determines the average of the plurality of first correction values ​​A and the second correction values ​​B selected from the tables of Figures 11 and 12 as the correction value. That is, for example, when the foil film F is the first foil film F1, the sheet S has a first width, a first thickness, and is in the normal mode, the control unit 100 calculates the first correction value A by the arithmetic average of A1, A4, A6, and A8.

[0099] According to the configuration described above, the following effects can be obtained in this embodiment.

[0100] The foil transfer device 1 can open the cover 22 to replace the foil film F or remove a jammed sheet S. However, since the temperature inside the foil transfer device 1 may be high after foil transfer is performed, the control unit 100 controls the cover 22 to be locked so that the cover 22 cannot be opened until the temperature drops below a certain level. During foil transfer, the control unit 100 presses the heating roller 61 and the pressure roller 51 together, and the shutter 62 covering the heating roller 61 is retracted. For this reason, if the cover 22 were not locked during foil transfer, it would be possible for the cover 22 to be opened, and the user could potentially touch the heating roller 61. For this reason, the cover 22 is not unlocked during foil transfer, regardless of the internal temperature.

[0101] In addition, even if foil transfer is not being performed, if the shutter 62 covering the heating roller 61 is at a high temperature, the cover 22 is not unlocked. In this embodiment, even if a temperature sensor is not provided on the shutter 62, the temperature of the shutter 62 is predicted and the lock mechanism 8 is controlled. Specifically, the control unit 100 calculates a first lock determination temperature T1 by adding a first correction value A determined from the conditions for performing foil transfer to the detected temperature T detected by the temperature sensor 66 (T+A), and if the first lock determination temperature T1 is equal to or higher than a first threshold, controls the lock mechanism 8 to lock the cover 22. Then, the control unit 100 calculates a second lock determination temperature T2 by adding a second correction value B different from the first correction value A (T+B), and if the second lock determination temperature T2 is lower than the second threshold, controls the lock mechanism 8 to unlock the cover 22. That is, the first locking determination temperature T1 is the estimated temperature of the shutter 62 when the heating roller 61 is in the ON state, and the second locking determination temperature T2 is the estimated temperature of the shutter 62 when the heating roller 61 is in the OFF state. With this configuration, the first lock determination temperature T1, which is the determination criterion for locking the cover 22, and the second lock determination temperature T2, which is the determination criterion for unlocking the cover, are determined by adding appropriate correction values ​​(first correction value A, second correction value B), respectively. As a result, the locked state of the cover 22 is prevented from becoming unnecessarily long, improving user convenience. Furthermore, with this configuration, the temperature of the shutter 62 can be estimated without arranging the temperature sensor 66 on the shutter 62.

[0102] Furthermore, the first correction value A and the second correction value B are determined to be larger values ​​A2 and B2 when the second foil film F2 is attached than when the first foil film F1 is attached. As shown in Fig. 5, when the second foil film F2 is attached, air easily passes near the sensor 66, so that the area near the sensor 66 of the sheet metal 67 is more likely to cool than other areas compared to when the first foil film F is attached. For this reason, it is preferable to set the first correction value A and the second correction value B to be larger values ​​A2 and B2 than when the first foil film F1 is attached. Furthermore, when the third foil film is attached, the values ​​A3 and B3 are determined to be larger than when the first foil film F1 is attached and smaller than when the second foil film is attached. As shown in Fig. 5, the first foil film F (see region R1) is a wide film, so both the shutter 62 and the metal plate 67 are difficult to cool. As shown in Fig. 5, when the third foil film F3 is attached, the half of the metal plate 67 on the side where the sensor 66 is not arranged is easy to cool, but the other half of the metal plate 67 on which the sensor 66 is arranged is difficult to cool, so it is preferable to set values ​​A3 and B3 larger than when the first foil film F1 is attached and smaller than when the second foil film is attached. As a result, the first correction value A and the second correction value B are determined to values ​​corresponding to either the first foil film F1, the second foil film F2 or the third foil film F3 that has been attached, and the locked and unlocked states of the cover 22 are each appropriately calculated.

[0103] Moreover, the first correction value A is determined to be a larger value when the sheet S has a narrow first width than when the sheet S has a wide second width. When the sheet S has a narrow width, the temperature of the metal plate 67 is lower than that of the shutter 66, and the difference in temperature between the shutter 66 and the metal plate 67 becomes large, so it is preferable to set the correction value to a large value. As a result, the first correction value A is determined to be a value corresponding to the width (first width, second width) of the sheet S, so that the locked and unlocked states of the cover 22 are each appropriately calculated.

[0104] Moreover, the first correction value A is determined to be a larger value when the thickness of the sheet S is a first thickness that is small than when the thickness is a second thickness that is larger than the first thickness. When the thickness of the sheet S is small, the temperature of the metal plate 67 is low relative to the shutter 66, and the difference in temperature between the shutter 66 and the metal plate 67 becomes large, so it is preferable to set the correction value to a large value. As a result, the first correction value A is determined to be a value corresponding to the thickness (first thickness, second thickness) of the sheet S, so that the locked and unlocked states of the cover 22 are each appropriately calculated.

[0105] Furthermore, the first and second correction values ​​are determined to be larger when the foil saving mode is executed than when the normal mode is executed. When the foil saving mode is executed, the temperature of the metal plate 67 is lower than that of the shutter 66 compared to when the normal mode is executed, and the difference in temperature between the shutter 66 and the metal plate 67 becomes larger, so it is better to set the correction values ​​to larger values. As a result, the first correction value A and the second correction value B are determined to values ​​corresponding to the normal mode or the foil-saving mode, so that the locking and unlocking of the cover 22 are appropriately calculated.

[0106] Furthermore, by providing a gap of 5 to 15° C. between the first and second threshold values, frequent repetition of locking and unlocking of the cover can be suppressed.

[0107] Furthermore, since the cover is unlocked only when the shutter is in the first position covering the heating member, it is possible to prevent the user from touching the heating member.

[0108] Furthermore, since the temperature sensor 66 is disposed on the metal plate 67, the temperature sensor 66 can detect the temperature corresponding to the state of the heating roller 61.

[0109] The present invention is not limited to the above-described embodiment, but can be used in various forms as exemplified below.

[0110] In the above embodiment, the control unit 100 calculates a first locking determination temperature T1 by adding a first correction value A determined from the conditions for performing foil transfer to the detection temperature T detected by the temperature sensor 66, and if the first locking determination temperature T1 is equal to or greater than a first threshold value, controls the locking mechanism to lock the cover, and calculates a second locking determination temperature T2 by adding a second correction value B to the detection temperature T detected by the temperature sensor 66, and if the second locking determination temperature T2 is less than the second threshold value, controls the locking mechanism to unlock the cover, but this configuration is not limited to this. For example, when the detected temperature T detected by the temperature sensor 66 is equal to or greater than the value obtained by subtracting a third correction value D determined from the conditions for performing the foil transfer from the third threshold value, the control unit 100 locks the cover 22, and when the detected temperature T detected by the temperature sensor 66 is equal to or greater than the value obtained by subtracting a fourth correction value E determined from the conditions for performing the foil transfer from the fourth threshold value, the control unit 100 less than If so, the cover 22 may be configured to be unlocked.

[0111] In this modification, the criterion value for locking the cover and the criterion value for unlocking the cover 22 are determined by subtracting different correction values ​​from the respective threshold values. Therefore, the locking and unlocking of the cover 22 are appropriately calculated for the conditions for performing the foil transfer. As a result, the locked state of the cover 22 is prevented from being unnecessarily long, improving user convenience.

[0112] In the above embodiment, the lock lever is located at the front end of the cover, and the actuator, the swing limiting member and the lock pin are located on the housing body, but the lock lever may be located on the housing body, and the actuator, the swing limiting member and the lock pin may be located on the cover.

[0113] In the above embodiment, the control unit determines the width of the foil film and the width of the sheet S based on signals from the sensors, but the control unit may also determine the width based on information input by the user.

[0114] In the above embodiment, the second correction values ​​B4 and B5 are the same value (B4=B5), and the second correction values ​​B6 and B7 are the same value (B6=B7), but they may be different values.

[0115] In the above embodiment, the conditions for performing foil transfer to change the first correction value A and the second correction value B were determined by the type of foil film F, the width and thickness of the sheet S, and whether the mode was normal or foil save mode, but are not limited to this. For example, the control unit may be configured to change the first correction value A and the second correction value B depending on the length of the sheet S in the transport direction, the transport speed of the sheet S (full speed, half speed), the fixing temperature setting of the heating roller, the continuous execution time of foil transfer, and the environmental conditions of the device such as temperature and humidity.

[0116] In the embodiment, the control unit 100 determines the first correction value A and the second correction value B based on a condition table corresponding to each condition, but may determine them based on a predetermined calculation formula.

[0117] In the above embodiment, the movable frame 70 is moved from the second position to the first position by being pressed by the cam 73, but this is not limited to the configuration and the movable frame 70 may be moved from the second position to the first position by being pressed by another member, for example, a solenoid actuator.

[0118] In the above embodiment, the pressure roller 51 is used as the pressure member and the heating roller 61 is used as the heating member, but the present invention is not limited to this. For example, the pressure member may be a pad that sandwiches the sheet and foil film between the pressure member and the heating roller. The heating member may also be a plate-shaped member that sandwiches the sheet and foil film between the pressure member and the heating roller.

[0119] In the above embodiment, the roller-shaped second guide shaft 42 is exemplified as the peeling member, but the present invention is not limited to this, and the peeling member may be, for example, a plate-shaped blade. In the above embodiment, the roller-shaped third guide shaft 43 is exemplified as the regulating member, but the present invention is not limited to this, and the regulating member may be, for example, a plate-shaped blade.

[0120] In the above embodiment, the foil transfer film cartridge FC is provided with the supply reel 31 and the take-up reel 35, but the present invention is not limited to this. For example, the foil transfer film cartridge may be provided with a supply reel, and the housing may be provided with a take-up reel.

[0121] In the above embodiment, a foil transfer device that transfers foil onto a toner image formed on a sheet is exemplified, but the present invention is not limited to this, and the foil transfer device may be any device that transfers foil onto a sheet.

[0122] In the above embodiment, the foil film F is configured with four layers, but the present invention is not limited to this, and the foil film may have any number of layers as long as it has a transfer layer and a support layer.

[0123] In the above embodiment, the film unit is composed of a foil transfer film cartridge and a holder, but the present invention is not limited to this, and the film unit does not have to have a holder. Also, the holder may support the foil transfer film cartridge in an undetachable manner.

[0124] The elements described in the above-mentioned embodiment and modified examples may be implemented in any combination. [Explanation of symbols]

[0125] 1 Foil transfer device 6 Heating Unit 7 Approach / separation mechanism 8 Locking mechanism 21. Main unit 21A opening 22 Cover 50 Transcription unit 51 Pressure roller 60 Fixed Frame 61 Heating roller 62 Shutter 66 Temperature Sensor 67 Sheet Metal 70 Movable Frame 81 Lock lever 100 Control section A 1st correction value B Second correction value F foil film F1 1st foil film F2 Second foil film F3 3rd foil film T Detected temperature T1 First lock judgment temperature T2 Second lock judgment temperature

Claims

1. A foil transfer device that overlays a sheet on a foil film containing a foil and transfers the foil to the sheet, A housing body having an opening; a cover movable between a closed position that closes the opening and an open position that opens the opening; a locking mechanism capable of locking the cover in the closed position; a heating member for heating the foil film and the sheet; a pressure member for sandwiching the foil film and the sheet between the pressure member and the heating member; a metal plate facing the heating member, the metal plate extending in a width direction of the foil film and located downstream of the heating member in a sheet conveying direction; A temperature sensor is disposed on the metal plate and faces the heating member; a contact / separation mechanism that moves the heating member between a pressure contact position where the heating member is in pressure contact with the pressure member and a spaced position where the heating member is spaced from the pressure member; a shutter that is interlocked with the operation of the contact / separation mechanism and is located at a first position between the heating member and the pressure member and covers the heating member when the heating member is located at a separated position, and is located at a second position that is different from the first position when the heating member is located at a pressure contact position; A control unit, The control unit is a first lock determination temperature is calculated by adding a first correction value determined from a condition for performing foil transfer to a detected temperature detected by the temperature sensor, and when the first lock determination temperature is equal to or higher than a first threshold value, the lock mechanism is controlled to lock the cover; a second lock determination temperature is calculated by adding a second correction value determined from a condition for performing foil transfer, the second correction value being different from the first correction value, to the detected temperature detected by the temperature sensor; and when the second lock determination temperature is less than a second threshold value, the lock mechanism is controlled to unlock the cover. A foil transfer device characterized in that, when the shutter is located in a second position, the locking mechanism is controlled to lock the cover, and the cover is not unlocked regardless of the detected temperature detected by the temperature sensor.

2. The foil transfer device is a first foil film, the first foil film being a foil film of a first width; A second foil film is attached to a central region in the width direction of the region where the first foil film is attached, and is a foil film having a second width narrower than the first width; a third foil film which is attached to a side area of ​​the first foil film in the width direction of the area where the first foil film is attached and is a foil film having the second width; Either of the following can be installed. the temperature sensor is located in a region where the second foil film and the third foil film are both attached in a width direction, and is located closer to an end of the second foil film than to a center of the second foil film; The first correction value and the second correction value are When the second foil film is attached, the value is determined to be larger than when the first foil film is attached, 2. The foil transfer device according to claim 1, characterized in that when the third foil film is installed, the value is determined to be larger than when the first foil film is installed and smaller than when the second foil film is installed.

3. 3. The foil transfer device according to claim 1, wherein the first correction value is determined to be larger when the sheet has a first width than when the sheet has a second width larger than the first width.

4. The foil transfer device according to any one of claims 1 to 3, characterized in that the first correction value is determined to be a larger value when the thickness of the sheet is a first thickness than when the thickness of the sheet is a second thickness that is thicker than the first thickness.

5. The control unit is A normal mode in which the foil film is brought into contact with the entire area of ​​the sheet in the sheet transport direction to perform transfer, and a foil save mode in which the foil film is brought into contact with a partial area of ​​the sheet in the transport direction to perform transfer, are executable; The first correction value and the second correction value are 5. The foil transfer device according to claim 1, wherein when the foil save mode is executed, a value larger than when the normal mode is executed is determined.

6. 6. The foil transfer device according to claim 1, wherein the first threshold value is greater than the second threshold value.

7. 7. The foil transfer apparatus according to claim 6, wherein the first threshold value is a temperature that is 5 to 15° C. higher than the second threshold value.

8. A foil transfer device that overlays a sheet on a foil film containing a foil and transfers the foil to the sheet, A housing body having an opening; a cover movable between a closed position that closes the opening and an open position that opens the opening; a locking mechanism capable of locking the cover in the closed position; a heating member for heating the foil film and the sheet; a pressure member for sandwiching the foil film and the sheet between the pressure member and the heating member; a metal plate facing the heating member, the metal plate extending in a width direction of the foil film and located downstream of the heating member in a sheet conveying direction; A temperature sensor is disposed on the metal plate and faces the heating member; a contact / separation mechanism that moves the heating member between a pressure contact position where the heating member is in pressure contact with the pressure member and a spaced position where the heating member is spaced from the pressure member; a shutter that is interlocked with the operation of the contact / separation mechanism and is located at a first position between the heating member and the pressure member and covers the heating member when the heating member is located at a separated position, and is located at a second position that is different from the first position when the heating member is located at a pressure contact position; A control unit, The control unit is when the detected temperature detected by the temperature sensor is equal to or greater than a value obtained by subtracting a third correction value determined based on a condition for performing foil transfer from a third threshold value, the locking mechanism is controlled to lock the cover; when the detected temperature detected by the temperature sensor is less than a value obtained by subtracting a fourth correction value determined based on a condition for performing foil transfer from a fourth threshold value, the locking mechanism is controlled to unlock the cover; A foil transfer device characterized in that, when the shutter is located in a second position, the locking mechanism is controlled to lock the cover, and the cover is not unlocked regardless of the detected temperature detected by the temperature sensor.

9. 9. The foil transfer device according to claim 1, wherein the heating member is a rotatable heating roller.

10. 10. The foil transfer device according to claim 1, wherein the pressure member is a rotatable pressure roller.

11. The locking mechanism includes: a lock lever that is pivotable between a lock position where the cover is locked in a closed position and an unlock position where the cover is not locked; a swing restriction member movable between a restriction position where the lock lever is restricted from swinging from the lock position to the unlock position and a non-restriction position where the lock lever is not restricted from swinging from the lock position to the unlock position; The foil transfer device according to any one of claims 1 to 10, further comprising:

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