JPH06751U - Thermal transfer recorder - Google Patents

Abstract

(57) [Abstract] [Purpose] A grip and a release switching mechanism are installed between the paper discharge pinch roller and the paper discharge roller, and when printing, the paper discharge pinch roller and the paper discharge roller are separated from each other by printing by pinning the paper. In the case of scratches and twisting due to rubbing between the surface and the paper guide, the paper is not broken and the quality of the printed surface is prevented from deteriorating. [Structure] A pinch pressing plate 26 attached to one end of a pinch pressing angle lever portion 27b which rotates around a fulcrum 27a acts on a pinch roller 25 to be attached to and detached from a capstan roller 14a. The pinch pressing cam 32 acting on the other end of the lever portion 27b acts on the discharge pinch angle 45 via the discharge pinch link 48. The discharge pinch angle 45 is fitted with a discharge pinch spring 46,
A paper discharge pinch roller 21 is pivotally supported on the paper and is attached to and detached from the paper discharge roller 20b. When the pinch roller 25 is pressing the capstan roller 14, the paper discharge pinch roller 21 and the paper discharge roller 20b are separated from each other.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a thermal transfer recording device.

[0002]

[Prior art]

 A conventional thermal transfer recording device will be described with reference to FIGS. FIG. 4 is a sectional view of a basic mechanism of a conventional thermal transfer recording device. The sheets are stocked in the sheet feeder 1 located at the bottom of the device. The main mechanical portion is supported by the base 2 and a side plate (not shown). The base 2 supports a paper feed motor 3, a shutter solenoid 4, and a shutter lever 8. The shutter solenoid 4 and the shutter lever 8 are connected to a plunger 5 and a shutter angle 7, and the shutter lever 8 is a shutter. The lever support pin 8a is rotatable about a fulcrum, and the shutter lever 8 can switch between opening and closing the path of the paper guides 10 and 11 forming the path of the paper.

A spring 6 is attached to the plunger 5, and when a current is applied to the shutter solenoid 4, the path of the paper guides 10 and 11 is opened to allow paper to enter, and when the current is cut off, the spring 6 is inserted. The elastic force of 6 blocks the paths of the paper guides 10 and 11 to form a paper conveyance path by the paper guide 11 and the paper guide portion 2a of the base 2.

The paper feed motor 3 has a pulley 12 on its shaft, and transmits power to a capstan roller 14a by a timing belt 13. In addition to the capstan pulley A14b connected to the paper feed motor 3 and the timing belt 13, a capstan pulley B14c that rotates together with the capstan shaft 14 and a capstan gear 14d are mounted on the capstan shaft 14.

The capstan pulley B14c is connected to a paper feed pulley 16a and a discharge pulley 18a by a timing belt 15, the paper feed pulley 16a is a paper feed roller 16b, and the discharge pulley 18a is a discharge gear 18b and a discharge idler gear 19 and the like. Also, the discharge roller gear 20a is rotated to power the discharge roller 20b. A pair of a paper feed pinch roller 17 and a paper discharge pinch roller 21 are supported so as to press and contact the paper feed roller 16b and the paper discharge roller 20b so that the paper 50 can be conveyed and discharged. The capstan gear 14d rotates the platen idler gear 22 and the platen gear 23 to give a driving force to the platen roller 24.

A pinch roller 25 is supported on the capstan roller 14a so that the entire width of the paper can be carried together with the capstan roller 14a so that the paper can be conveyed. The pinch roller 25 has a pinch pressing plate 26 that presses the pinch roller 25 against the capstan roller 14a via a pinch roller shaft 25a and a pinch pressing angle 27 that supports the pinch pressing plate 26 in order to generate a stronger grip during printing. is there. The pinch pressing angle 27 can swing around a fulcrum 27a.

The pinch pressing is performed by the rotation of the pinch pressing cam 32 positioned so as to contact the tip of the lever portion 27b of the pinch pressing angle 27. The pinch pressing cam 32 is supported by a pinch pressing cam shaft 35. A pinch pressing gear 30 is provided on the pinch pressing cam shaft 35 so as to engage with the pinion gear 29 so that the head motor 28 can drive the pinch pressing gear 30. Since the pinch pressing gear 30 is supported by the pinch pressing camshaft 35 via a one-way clutch, it transmits power to the pinch pressing camshaft 35 only when rotating in the direction of the counterclockwise arrow in FIG. At this time, the pinch pressing gear 30 and the pinch pressing cam shaft 35 rotate idly.

Further, the pinch pressing gear 30 meshes with the head gear 31 so that the head shaft 36 can be driven. The headgear 31 incorporates a one-way clutch like the pinch pressing gear 30 and transmits the drive to the headshaft 36 only in the counterclockwise arrow direction in the figure. A head cam 33 is incorporated in the head shaft 36 and is sandwiched between a head plate 38 and a head angle 34 fixed to the head plate 38. At the time of printing, the head cam 33 contacts the head plate 38 and presses the head 37 supported by the head plate 38 against the platen roller 24. Further, at the time of non-printing, it contacts the upper portion of the head angle 34 and serves to separate the head 37 from the platen roller 24.

Further, as shown in the conventional head-up / down mechanism diagram of FIG. 5, the head shaft 36 and the pinch pressing cam shaft 35 are equipped with a head sense cam 39 and a pinch sense cam 40, respectively. Each position of the head cam 33 and the pinch pressing cam 32 is detected.

Next, the operation will be described. When the power is turned on, the initialization operation starts. Initialization puts the device in a standby state and initializes the head and releases the pinch pressure. The end of the initialization operation is recognized by detecting the rotational states of the head sense cam 39 and the pinch sense cam 40 by the microswitches 41 and 42. This situation is shown in FIGS. 6 and 7, which are diagrams of the position detection mechanism for pressing the head pinch.

FIG. 6 shows the micro switch off, and FIG. 7 shows the on state. With the rotation of the head shaft 36 and the pinch pressing cam shaft 35, the head sense cam 39 and the pinch sense cam 40 also rotate to detect the positions of the head cam 33 and the pinch pressing cam 32.

As shown in the table of position detection of the micro switch in FIG. 8, four positions are detected. A one-way clutch is mounted on each of the headgear 31 and the pinch pressing gear 30, and since the power is transmitted to the respective shafts by the normal rotation and the reverse rotation of the head motor 28, the positioning can be performed independently. You can The initialized state is when the head 37 is up and the pinch pressure is open.

When printing is performed by operating an operation panel (not shown), when the control circuit of FIG. 9 receives a print command, the paper feed motor 3 rotates in the direction in which the paper feed roller 16b feeds the paper into the paper guide 11. To start. At the same time, a current flows through the shutter solenoid 4 and the path of the paper guides 10, 11 is formed. A sheet is fed from the sheet feeder 1, and the sheet detection sensor 44 attached to the paper guide 10 is turned on. The sheet is conveyed to the paper guide 11. The paper is fed until the trailing edge comes off the paper feed roller 16b. Whether or not the paper comes off the paper feed roller 16b is detected by how many pulses the paper feed motor 3 has sent after the paper detection sensor 44 is cut off.

When the trailing edge of the paper comes off from the paper feed roller 16b, the current to the shutter solenoid 4 is cut off, and the paper is conveyed to the platen roller 24 formed by the paper guide 11 and the paper guide portion 2a of the base 2. A path is formed, the head motor 28 starts rotating, and the head 37 is up and the pinch pressing stops in the pressed state. The paper feed motor 3 starts rotating in the reverse direction, and the paper is sent to the platen roller 24. When the paper reaches the base paper guide portion 2a, the paper detection sensor 9 having a lever on the paper guide portion 2a of the base 2 detects the front end of the paper, and the pulse count of the paper feed motor 3 causes the paper front end to move. Recognize that the capstan roller 24 has been reached.

Next, the head motor 28 rotates in the opposite direction to the operation of the pinch pressing mechanism to bring the head 37 into the down state and start printing. Since the printing is performed for each color, the head 37 goes up and the paper feed motor 3 reversely rotates every time one color is finished, the paper is returned toward the paper guide 11, and the print is cueed again. The next printing starts. Printing is accomplished by repeating this process during printing of yellow, magenta, cyan, or yellow, magenta, cyan, and black.

When the printing of the last one color is completed, the head motor 28 is rotated to raise the head 37 to rotate the paper feed motor 3 to convey the paper to the paper guide 11. There is a paper detection sensor 43 just before the leading edge of the paper passes through the paper guide 11 and reaches the discharge roller 20b. When the paper passes, the sensor works to inform the control unit of FIG. 9 that the paper is normally fed. Inform.

After the trailing edge of the sheet passes through the sheet detection sensor 43, the control unit is informed of the completion of sheet ejection by the pulse count sent by the paper feed motor 3. Upon obtaining this information, the control unit stops the rotation of the paper feed motor 3, initializes the apparatus, and returns to the standby state again.

[0018]

[Problems to be solved by the device]

 In the thermal transfer recording apparatus as described above, both the paper discharge roller 20b and the paper feed roller 16b feed the paper at the time of printing, but there is a difference in the paper feed amount of both due to the dimensional accuracy of the parts and the assembly accuracy. Occurs, and the paper is warped or pinned in the path of the paper guide 11. If the paper is bent, the paper may be broken, and if the paper is pinned, it may be scratched by rubbing against the paper guide 11. Either of them may deteriorate the print quality.

Therefore, the present invention aims to solve the above problems.

[0020]

[Means for Solving the Problems]

 In order to solve the above problems, the grips of the paper discharge pinch roller 21 and the paper discharge roller 20b of the discharge roller unit are made detachable, and gripped only at the time of discharge, otherwise the grip is released. I decided to leave it.

[0021]

[Action]

 By doing the above, it has become possible to prevent the paper from bending and pinning during printing.

[0022]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a device diagram of an embodiment of the present invention. The discharge pinch link 48 and the discharge pinch angle 45 are supported by side plates (not shown) by pins 48a and 45a which are respectively erected, and are rotatable about the pins 48a and 45a as fulcrums.

Also, pins 48b and 48c are erected at both ends of the discharge pinch link 48, and a rotatable roller 47 is attached to the pin 48b. The pin 48b and 48c contact the pinch pressing cam 32 described in the conventional example, and A counterclockwise rotational force is applied from the motor 28. With the rotation of the pinch pressing cam 32 described above, the pin 48a rotates about the pin 48a as a fulcrum.

On the other hand, the pin 48c standing on the other end is inserted into an elongated hole (not shown) provided at the end of the discharge pinch angle 45, and the rotational force given by the rotation of the pinch pressing cam 32 is applied to the pin 48c. A transmission link structure is formed on the discharge pinch angle 45. The discharge pinch angle 45 is provided with discharge pinch springs 46 at six positions along the width of the sheet by a fastening method such as screwing, welding, or adhering.

A part of the discharge pinch spring 46 is bent to hold the pin 21 a of the paper discharge pinch roller 21 above the discharge pinch angle 45, and a driving force from a drive source (not shown) is applied. It is possible to rotate with the rotation of the paper discharge roller 20b. Further, the ejection pinch spring 46 functions as a cushion when the ejection pinch angle 45 is rotated by its elastic force and the paper ejection pinch roller 21 contacts the paper ejection roller 20b.

With the above-described link structure, when the pinch is pressed, the discharge pinch link 48 and the discharge pinch angle 45 rotate as shown in FIG. 2 to rotate the paper discharge pinch roller 21 of the discharge roller unit. When the pinch roller 25 and the capstan roller 14a are separated from each other and the pinch pressing is released as shown in FIG. 3, the paper discharge roller 20b and the discharge pinch roller 21 are gripped. Become so.

As described in the conventional example, the pinch pressing is always performed during printing as shown in FIG. 2, so that the grips of the paper discharge roller 20b and the paper discharge pinch roller 21 of the discharge roller unit are released. Therefore, the sheet 50 can be prevented from being bent or pinched between the sheet feed roller 16a and the sheet discharge roller 20b. When the printing is completed and the paper 50 is discharged, the pinch pressing is released when the leading edge of the paper is applied to the paper detection switch 43 near the paper discharge roller portion of the paper guide 11, and the paper discharge pinch roller of the discharge roller portion is released. 21 and the paper discharge roller 20b may be gripped.

In the present embodiment, the grip of the discharge pinch roller 21 of the discharge roller portion is attached and detached using the pinch pressing cam 32, but the same effect can be obtained even if a single actuator is provided. You can However, since the cost of the device can be minimized by using the actuator also, the present embodiment is superior.

[0029]

[Effect of device]

 If the above-described paper discharging mechanism is provided in the thermal transfer recording apparatus, the pinch roller 25 and the capstan roller 14a are constantly pinched during printing, so that the paper discharging pinch roller 21 and the paper discharging roller of the discharge roller unit are discharged. The grip of the roller 20b is maintained in the released state, and it is possible to prevent the sheet from being twisted or pinned between the paper feed roller 16a and the sheet discharge roller 20b. Therefore, when the sheet is bent, the sheet 50 is folded. In the case of pin-tensioning, it is possible to prevent deterioration of print quality due to scratches caused by rubbing with the paper guide 11, and it is possible to obtain good print quality. Further, since the grip of the paper discharge pinch roller 21 of the discharge roller unit is attached and detached using the pinch pressing cam 32, it is possible to suppress the cost increase of the apparatus when the single actuator is provided.

[Brief description of drawings]

FIG. 1 is a device diagram of an embodiment of the present invention.

FIG. 2 is an operation diagram when the discharge pinch of the present invention is opened.

FIG. 3 is an operation diagram of the discharge pinch grip of the present invention.

FIG. 4 is a device diagram of a conventional example.

FIG. 5 is a diagram of a conventional head-up / down mechanism.

FIG. 6 is a diagram of a head and pinch pressing position detection mechanism (microswitch off).

FIG. 7 is a diagram of a head and pinch pressing position detection mechanism (micro switch on).

FIG. 8 is a list of micro switch position detections.

FIG. 9 is a circuit block diagram of the device.

[Explanation of symbols]

 11 Paper Guide 14a Capstan Roller 20b Paper Ejection Roller 21 Paper Ejection Pinch Roller 25 Pinch Roller 27 Pinch Press Angle 28 Head Motor 32 Pinch Press Cam 45 Ejection Pinch Angle 46 Ejection Pinch Spring 47 Roller 48 Ejection Pinch Link

Claims (1)

[Scope of utility model registration request] 1. A reciprocating printing unit is provided, in which a set of a capstan roller and a pinch roller and a set of a paper discharge roller and a paper discharge pinch roller are arranged with the print head interposed therebetween, whereby the paper reciprocates for each color. In the color thermal transfer recording apparatus that performs color printing by repeating printing, the repetitive printing unit interlocks with the printing operation of the print head, presses the paper against the capstan roller with the pinch roller, and interlocks with the non-printing operation. Then, the pinch roller drive mechanism that releases the pressure is released, and the pressure between the paper ejection pinch roller and the ejection roller is released in conjunction with the printing operation of the print head, and the paper ejection pinch is interlocked with the non-printing operation. A color heat transfer device including a paper discharge pinch roller driving mechanism that presses the paper discharge capstan roller by a roller. Recording device.