JP2990533B2 - Label printing electrostatic recorder - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a fixing roll in an electrostatic recording apparatus for label printing, and relates to a case where continuous recording paper is loosened in front of the fixing roll due to slippage of the fixing roll. And a device for eliminating the slack.

(Prior art and its problems) Printing of various types of information on each label on continuous recording paper in which labels that have been die-cut into appropriate shapes from label base paper and are temporarily attached at predetermined intervals on a backing paper are successively attached. In the past, in many cases, a thermal printer was used, but recently, an electrostatic recording apparatus has been used.

The label is only a separation cut line and a gap (waste = unnecessary part)
For those of the type temporarily attached on the backing paper,
Labels that are die-cut from the label base paper and temporarily attached at predetermined intervals on the backing paper with unnecessary (scrap) portions removed, have rounded corners of the label, or have a circular or triangular shape. , Hexagons, flower shapes, etc. can be made optional, the ease of label peeling, and the difference in light transmittance between the laminated part of the label and the mount and the part of only the mount, special This is widely used because, for example, the portion of only the backing sheet can be used as a portion to be detected for the label pitch (interval between each label on the backing sheet) without marking.

As shown in FIG. 3, the continuous recording paper A in which the labels L die-cut from the label base paper are successively temporarily attached on the mount S at predetermined intervals, the portion of the mount S where the label L does not exist is generally used. It is exposed as a surface in a state where a release agent made of silicon is applied. Further, the thickness differs between the laminated portion of the label L and the mount S and the portion of the mount S alone.

In the electrostatic recording apparatus, generally, the rotational peripheral speeds of the photosensitive drum and the fixing roll pair are completely matched, and this is the transfer speed of the continuous recording paper.

As described above, when the continuous recording paper A is loaded into the conventional electrostatic recording apparatus and printing is performed, at the time when the continuous recording paper A passes through the fixing roll, only the mount S is coated with the release agent. When the fixing roller (heat roll) is moved up and down when switching from a layered portion of the label L and the backing sheet S to a portion including only the backing sheet S or vice versa, the fixing is performed. Slip occurs between the roll and the continuous recording paper.

As a result, the transfer amount of the continuous recording paper is smaller in the fixing roll portion than in the photosensitive drum portion, and the continuous recording paper is slackened before the fixing roll. If this phenomenon is accumulated in the case of continuous printing, for example, it may cause a trouble such as a paper jam.

(Object of the Invention) In view of the above-described drawbacks of the conventional apparatus, the present invention detects a slack of a continuous recording sheet in front of a fixing roll and detects the slack to eliminate the slack of the continuous recording sheet. It is an object to provide an electrostatic recording device for use.

(Summary of the Invention) The continuous recording paper A is called a fanfold paper as shown in FIG. 3, and is provided with holes P to be fed on both sides of the backing paper S, so that it is easy to cut out each unit. There are a type that is folded at the perforation M and a type that is a so-called roll type. Here, after printing different types of data continuously, a printed matter (label) of necessary data is printed in the middle. It is intended to be a fan-fold paper type which has advantages such as easy cutting and easy removal and no need for a winding mechanism.

Therefore, in order to initially load the leading end of the continuous recording paper to the position of the fixing roll, and to prevent the continuous recording paper from meandering from the photosensitive drum to the fixing roll, the transport speed is set to be equal to the rotational speed of the photosensitive drum. A recording paper transporting means which is set and which transports continuous recording paper while being disengaged from the feed hole P is disposed between the photosensitive drum and the fixing roll.

And, a motor for driving the fixing roll alone is provided,
A detecting means for detecting the slack of the continuous recording paper is disposed between the recording paper transporting means and the fixing roll, and the output of the detecting means for detecting the slack determines the rotational speed of the motor for driving the fixing roller to fix the slack. From the state where the rotation peripheral speed of the roll matches the rotation peripheral speed of the photosensitive drum, speed control is performed to increase the rotation speed more than that, and the transfer amount of the continuous recording paper per unit time by the fixing roll is increased. Thus, the slack of the continuous recording paper is eliminated.

(Embodiment of the Invention) FIG. 1 shows an electrostatic recording apparatus for label printing using fanfold paper type continuous recording paper.
Is a photosensitive drum, 2 is output light corresponding to image data provided by an electrostatic latent image forming means such as a semiconductor laser or an LED array, 3 is a cleaning brush, 4 is a photosensitive charger, 5 is a developing device, and 6 is This is a transfer charger.

Reference numeral 8 denotes a fixing roll, which is constituted by a pair of a heat roll 8A and an auxiliary roll 8B.

Further, A temporarily attaches a label L die-cut from a label base paper as shown in FIG. 3 to a mount S at predetermined intervals (label pitch), and forms feed holes P on both sides of the mount S. Continuous recording paper.

Reference numeral 10 denotes a sprocket wheel which is disposed between the photosensitive drum 1 and the fixing roll 8 and has pins 10a which are engaged with and disengaged from the feed holes P provided on the circumferential surface at equal intervals. The sprocket wheel 10 has a pair of structures located on both sides of the continuous recording paper A. As is well known, the sprocket wheel 10 can approach and separate from each other by center distribution according to different widths of the type of the recording paper A, and can move the Thus, the position can be set according to the width.

Numeral 11 is sandwiched between the boss portion of the sprocket wheel 10 and the brim portion 10b, and is movable integrally with the sprocket wheel 10 in the width direction of the recording paper A by the guide by the pin 14. A paper guide member that cannot be rotated by
A paper guide 12a is provided on the arm 12 extending to the photosensitive drum 1 side.
Is formed. That is, the paper guide portion 12a extends the paper guide stroke as compared with only the pin 10a of the sprocket wheel 10.

Reference numeral 15 denotes a well-known paper holding plate, which is movable in the width direction of the recording paper A together with the sprocket wheel 10, but does not rotate.
For example, the recording paper A is supported by a paper guide member 11 in a hinge format.
Can be opened and closed between a position where the recording paper A is released and a position where the recording paper A is pressed.

Reference numeral 16 denotes a detection element holder attached to the arm 13 extending to the fixing row 8 side of the paper guide member 11, on which the light emitting element 17 and the light receiving element 18 are placed.

The light-emitting element 17 and the light-receiving element 18 are set and arranged at such a condition that the amount of light reflected from the edge of the continuous recording paper A (the part not affected by the feed hole) can be monitored.

Since the position of the light emitting element 17 and the position of the light receiving element 18 correspond to the position of the paper guide member 11, the position necessarily adapts to the width of the continuous recording paper A.

The photosensitive drum 1 and the sprocket wheel 10 are connected to the same drive source (motor) via an interlocking mechanism (not shown), and are set under the condition that their rotational peripheral speeds match each other.

On the other hand, the fixing roller 8 is driven independently of the photosensitive drum system by a motor 20 in the block diagram shown in FIG. 2, and the motor 20 is composed of a motor drive circuit 21, a speed control circuit 22, and a light amount level comparison circuit. It is systematically connected to a circuit 23.

The light quantity comparison circuit 23 outputs a speed switching command signal to the speed control circuit 22 depending on whether the output level based on the light reflected by the light emitting element 17 of the light receiving element 18 via the continuous recording paper A is equal to or higher than the comparison reference level. The speed type is
The rotational peripheral speed of the fixing roll 8 is equal to the rotational peripheral speed of the photosensitive drum 1, and the rotational speed is higher than that.

With the above configuration, the control device of the entire apparatus (not shown) controls and drives the electrostatic latent image forming means for outputting the output light 2 and the operation mechanisms such as the photosensitive drum 1 to continuously record desired image information. This is to print and output on a label L on paper A.

The continuous recording paper A is conveyed from the left side of the photosensitive drum 1 in FIG. 1, the toner image is transferred from the photosensitive drum 1 onto the label L by the transfer charger 6, and is fixed by the fixing roll 8 via the sprocket wheel 10. After the fixing, the fixing roll 8
Is discharged to the right of

Here, the continuous recording paper A is, as shown in FIG.
The label L is temporarily attached at a predetermined interval, and a portion of only the mount S is intermittently present, and the portion of the mount S alone is exposed as a release agent application surface and has a low coefficient of friction, Since the thickness of the laminated portion of the backing sheet S and the label L is different from that of the portion of the backing sheet S alone, when passing through the fixing roll 8, the fixing roll 8 (heat roll 8A) is moved up and down to be continuous with the fixing roll 8. Slip occurs with the recording paper A.

As a result, the continuous recording paper A is in front of the fixing roll 8,
As shown by the two-dot chain line, slack occurs.

As a result of the generation of the slack, the output level of the light receiving element 18 decreases due to the attenuation of the amount of light reflected by the light emitting element 17 and the recording paper A.
23 outputs a speed switching command signal to the speed control circuit 22.

Accordingly, the rotation speed of the motor 20 is increased to make the peripheral speed of the fixing roll 8 faster than the peripheral speed of the photosensitive drum 1 and the sprocket wheel 10, thereby increasing the transfer amount of the continuous recording paper A per unit time. To eliminate slack.

If the slack of the continuous recording paper A is eliminated, the light receiving element
18 is again higher than the comparison reference level, and the rotational peripheral speed of the fixing roll 8 is changed to the photosensitive drum 1 and the sprocket wheel.
It is returned to the state that matched 10.

If the comparison reference level value is made narrower in the vertical direction, a vibration operation may occur, and if it is not preferable, a timer operation for giving a predetermined width or canceling the inversion operation within a short time may be used. By combining them, the vibration phenomenon can be prevented.

In a method using a sprocket wheel 10, the paper guide portion 12a of the paper guide member 11 is connected to the photosensitive drum 1 of the embodiment.
Instead of the downstream side, it may be made to face the upstream side.

Further, in addition to the method of the sprocket wheel 10, the recording paper transport means engages the pins with the feed holes while placing the recording paper on a flat portion by hanging an endless belt having pins formed between the two pulleys. The so-called pin tractor system may be used.

Furthermore, the detecting means for detecting the slack of the continuous recording paper includes:
A transmitted light type may be used instead of the reflected light type.

Although a single light receiving element is used, a multi-stage line sensor or a multi-level sensor system is used to control the rotational speed of the fixing roller in multiple stages according to the degree of slack of the continuous recording paper. Is also good.

(Effects of the Invention) The present invention relates to an electrostatic recording apparatus for label printing using a continuous recording paper in which labels that have been die-cut from a label base paper are temporarily attached to a backing paper at predetermined intervals, and are provided with a fixing roll. Even if the continuous recording paper becomes loose due to slippage, it is monitored and eliminated, so that troubles such as paper jams do not occur, and printed labels can be collected as desired without waste. It is very good in practical use.

Moreover, since the slack of the continuous recording paper is detected by the detecting means provided on the arm portion extending to the fixing roll side of the paper guide member movable in the width direction of the continuous recording paper, the width of the continuous recording paper changes. Even in such a case, since the position of the detecting means is determined at a position corresponding to the width of the continuous recording paper, looseness can be reliably detected.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing the configuration of an embodiment of the present invention, FIG. 2 is a control block diagram of a motor for driving a fixing roll, and FIG.
The figure is an explanatory perspective view showing an example of the continuous recording paper. DESCRIPTION OF SYMBOLS 1 ... Photosensitive drum, 8 ... Fixing roll 10 ... Sprocket wheel 1, ... Paper guide member 12a ... Paper guide part, 16 ... Detection element holder 17 ... Light emitting element, 18 ... Light receiving element 20 ... Motor 21 ... Motor drive circuit 22 ... Speed control circuit 23 ... Light level comparison circuit A ... Continuous recording paper S ... Mount, L ... Label

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B65H 23/18-23/198 B41S 15 / 16,11 / 42 G03G 15/00

Claims (1)

(57) [Claims] 1. An electrostatic recording method using a continuous recording paper in which a label which has been die-cut from a label base paper into an appropriate shape is temporarily attached to a backing paper continuously and holes to be fed are formed on both sides of the backing paper. In the apparatus, a sprocket wheel is provided between a photosensitive drum and a fixing roll, and is provided with a plurality of pins which are sequentially engaged with and disengaged from the feed hole at equal intervals on a circumferential surface and can move in the width direction of the continuous recording paper. Recording paper transport means for transporting the continuous recording paper by the sprocket wheel, and further moving at a speed corresponding to the rotation speed of the photosensitive drum that matches the rotation peripheral speed of the sprocket wheel; A paper guide member that can move in the width direction of the continuous recording paper integrally with the motor; a motor that drives a fixing roll alone; and a fixing roller that is disposed between the recording paper transport unit and the fixing roll, and fixes the paper guide member. Low Control means for detecting the slack of the continuous recording paper provided on the arm extending to the side of the printer, and controlling to increase the rotation speed of the motor by the output of the detecting means for detecting the slack of the continuous recording paper. An electrostatic recording apparatus for label printing, comprising: speed control means.