JPS61209174A - Image formation device - Google Patents

Abstract

PURPOSE:To easily adjust an extent of movement of an object to be transferred, and to suppress image retrogradation by providing a dip switch which sets a quantity of paper feeding in the reversed direction for each color of heat transfer ribbon and by operating the switch. CONSTITUTION:For instance, if a magenta M ribbon is faster than a yellow Y ribbon as much as l1 in its transferring start position, the contact point S1 of a dip switch 15 is turned on, and the contact points S1 and S2 are suitably set and a transferring start position is delayed. Then, if a cyanic C ribbon is slower than the magenta M ribbon as much as l2 in its transferring start position, a contact point S1 of a dip switch 16 is turned off,and the contact points S1 and S2 are suitably set and the transferring start position of the cyanic ribbon is advanced. Thus, in accordance with a transferring start position of a black ribbon in relation to the cyanic, the dip switch 17 s suitably set to have the transferring start position of the black to agree with the cyanic. Adjusting as stated above results in an agreement of the transferring start positions of all different colors.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention forms a 2-color image by, for example, transporting paper backward every time the transfer operation of one color is completed and transferring ink of multiple colors in an overlapping manner. The present invention relates to an image forming apparatus.

[Technical background of the invention and its problems]

FIG. 4 shows this type of image forming apparatus. The platen 3 is driven by a pulse motor 30, and a thermal head 32 is disposed facing the platen 31 so as to be able to approach and separate from it. Between these thermal heads 32° platens 3.10, both ends are rolls 33.3.
Thermal transfer (ink) sheet is wound around 4 and is driven by a Nolles motor (not shown). A port 35 is provided. As shown in FIG. 5, this thermal transfer IJ&N 35 includes colored inks 35□ consisting of yellow (G), magenta (F), cyan (C), and black (Bk).

35□, 353.354 are arranged in this order,
On the side of the yellow (A) colored ink 351 is a bar code 35. is provided. Therefore, this barcode 35. By detecting this, the yellow (a) color ink 35□ is set at the transfer start position.

Further, each of the inks 35□ to 354 is slightly larger than the size of the paper serving as the transfer material.

In the above configuration, when the paper P is inserted between the platen 31 and the thermal transfer retin 35 and color mode transfer is started, the thermal spatula P32 is pressed against the platen 31, and then the platen 31 is rotated in the normal direction. Transfer is performed using the color ink 351 of (Y). When this transfer is completed, the thermal head 32 is separated from the platen 31, the platen 31 is reversed, and only the paper P is transported back to the transfer start position. In this state, the thermal head 32 is pressed against the platen 3 again, and the paper P and the thermal transfer roller 35 are integrally driven by the platen 31, and the magenta color ink 35. are transferred onto the paper P in an overlapping manner. In this way, each time the transfer of one color is completed, only the paper P is fed backwards, and then the next color ink is superimposed and transferred, thereby forming one color image.

Note that the paper P is pressed against the platen 31 by registration rollers (not shown) to prevent it from shifting.

Further, the traveling distance of the thermal transfer retin 35v and the reverse feeding distance of the paper are controlled by the number of cells supplied to the cell motor.

By the way, in an image forming apparatus that transports paper backward each time one color of ink is transferred as described above, if the transfer start position of the paper shifts, the image quality of the transferred image deteriorates. Correction of the paper transfer start position largely depends on the accuracy of the paper feeding mechanism, and adjustment thereof is also difficult. Furthermore, although it was previously possible to correct the predetermined amount of paper movement for each color, it was difficult to easily adjust for errors between products and deviations due to changes over time. Purpose of the Invention The present invention has been made based on the above circumstances, and its purpose is to provide an image in which the amount of movement of the transfer material can be easily adjusted and deterioration in image quality can be suppressed. The present invention aims to provide a forming device.

[Summary of the invention]

Is this invention applicable to thermal transfer, for example? A dip switch is provided to set the amount of paper conveyance in the reverse direction for each color, and the transfer start position of the paper is made to coincide with each other by operating this switch.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows only the essential parts of the invention.

In the figure, a main control section 11 is composed of, for example, a microcomputer, and controls the operation of the entire image forming apparatus. The barcode detector 12 also detects the barcode 35 attached to the thermal transfer plate 35 described above. The main controller 11 recognizes from the detection output signal of the barcode detector 12 that the yellow ink is at the transfer start position. Further, the motor drive circuit 13 drives and controls the pulse motor 14 in accordance with commands from the main control section 11.
According to the operation of step 4, the paper as the transfer material is conveyed in the forward direction or in the reverse direction, as described above. Furthermore, the main control section 11 is provided with so-called dip switches 15, 16, and 17 as means for setting the conveyance amount of paper. These dip switches 15, 16, and 17 each have contact 8.
11829S, and each DIP switch 15, 16.17 is used to control the next transfer of the previously transferred ink, such as the shift of magenta with respect to yellow, the shift of cyan with respect to magenta, and the shift of black with respect to cyan. This is to adjust the ink transfer start position. These dip switches 15.16
17 is set as shown in FIG. 2 depending on the misalignment of each ink. In the figure, the ○ mark indicates that the contact of the switch is on, and the X mark indicates that the switch contact is off.

For example, when the contact S1.81 is on and the contact S is off, the main control unit 1 sets the paper transfer start position to the normal position.
! If the reverse feed amount of the paper is controlled so that it is delayed by 71 steps f (approximately 0.16 m), and contacts S□ and S3 are off and contact S is on, the transfer start position of the paper advances by one step compared to normal. The reverse feed amount of paper is controlled as follows.

In the above configuration, the adjustment operation will be explained. First of all,
Correctly load and remove paper and thermal transfer ribbon, and perform multiple sheet transfer operations. As a result, as shown in FIG. 3, if the transfer start position of magenta () is earlier than that of yellow (A) by t8, contacts S, , S, etc. are turned on as appropriate while contact s8 of the dip switch 15 is turned on. Set to delay the transcription start position. After this, if the transfer start position is delayed by t compared to cyan (C) (changed to magenta), contacts S, , S with contact SL of the dip switch 16 turned off.
, are set appropriately to advance the cyan transfer start position. Thereafter, the DIP switch 17 is appropriately set according to the transfer start position of black with respect to cyan, so that the transfer start position of black coincides with that of cyan.

By adjusting in this way, the transfer start positions of each ink are matched.

According to the above embodiment, the main control section 11 is provided with dip switches 15, 16, 17, and these dip switches 15, 16, 17 are provided.
, 16 and 17, the reverse feed amount of the paper relative to the previous ink is adjusted so that the transfer start position of the next ink coincides with the transfer start position of the previous ink. Therefore, the shift in the transfer start position of each ink can be easily corrected, and deterioration of the transferred image can be suppressed.

Note that this invention is not limited to the above embodiments,
Of course, various modifications can be made without departing from the gist of the invention.

〔Effect of the invention〕

As described in detail above, according to the present invention, it is possible to provide an image forming apparatus that can easily adjust the amount of movement of the transfer material and can suppress deterioration of image quality.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of an image forming apparatus according to the present invention; FIG. 2 is a circuit configuration diagram showing only the essential parts; FIG.
The figure is a diagram shown to explain how to adjust the transfer start position.
FIG. 4 shows an image forming apparatus to which the present invention is applied, and is a perspective view showing only essential parts, and FIG. 5 is a plan view showing a thermal transfer gun. 11... Main control unit, 13... Motor drive circuit, 14
.../J? Luss motor, 15, 16.17...Dip switch, 32...Thermal head, 35...
Heat transfer? N, P...Paper. Applicant's representative Patent attorney Takeshi Suzue 2 Figure 1 Shizu 2 Figure 2 Figure 3 Figure 4 Prisoner M5 figureffa+u6Ql! 4・-7,. '1 Mr. Manabu Shiga, Director-General of the Toki Agency ■, ・Special Patent Application No. 60-50899 2, Name of the invention Image forming device 3, Relationship with the Nagisa case to be amended Patent applicant: Billion Co., Ltd. Toshiba 4, Full text of agent Iv1m document 7, contents of amendments

Claims (1)

[Claims] 1) Transferring the colorant while the transfer material is being conveyed in the forward direction;
In an image forming apparatus that transports the material to be transferred in the reverse direction to a transfer start position after completion of transfer, and then transports the material to be transferred in the forward direction again to transfer other colorants to form an image, for each colorant, An image forming apparatus comprising: a setting means for setting a conveyance amount of a transfer material. 2) The image forming apparatus according to claim 1, wherein the setting means sets a reverse conveyance amount of the transfer material. 3) The image forming apparatus according to claim 1, wherein the setting means comprises a switch.