JPH0767994B2 - Diagonal single-sheet processing method in single-sheet feeding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is an apparatus which is installed above a printing unit of a printer and which feeds cut sheets set one by one to a predetermined printing position. A method for handling skewed cuts.

(Prior Art) Conventionally, in a printer or the like, a single-sheet feeding device for automatically feeding a single-cut sheet to a printing position has been widely used as an option.
There is one described in 63-145707. FIG. 3 is a schematic side view showing such a conventional cut sheet feeder, which will be described below with reference to the drawings.

As shown in the figure, the cut sheet feeding device 1 is installed above a printing unit 5 in which a print head 2 and a platen 3 are opposed to each other with a ribbon protector 4 interposed therebetween. The cut sheet feeder 1
A front seat guide 7 and a rear seat guide 8 are provided for inserting the single-cut sheet 6 from above substantially vertically. The front seat guide 7 is fixed to the left and right guide portions 8a, 8b of the rear seat guide 8. Also both seat guides 7,8
A detection sensor 9 for detecting the single-cut sheet 6 is arranged below the. The detection sensor 9 comprises a light-emitting diode 9a and a light-receiving transistor 9b, which are opposed to each other with a cut sheet 6 fed therebetween. Further, below the detection sensor 9, a feed roller 11 and a pressure roller 10 are arranged in pressure contact with each other. The detection sensor 9, the feed roller 11 and the pressure roller 10 are provided at positions where both left and right ends of the single-cut sheet 6 pass, as shown in FIG. FIG. 4 is a schematic front view showing a conventional cut sheet feeding device, and the printing unit 5, the front sheet guide 7 and the rear sheet guide 8 are omitted for convenience of explanation. In FIG. 3, an upper guide 12 and a lower guide 13 for guiding the cut sheet 6 are provided below the printing unit 5, and the upper guide 12 can remove the cut sheet 6 when it is jammed. Thus, it can be rotated in the direction of arrow C.

Next, the operation will be described.

When one sheet 6 is inserted from above and set between the front seat guide 7 and the rear seat guide 8, the detection sensor 9 detects this and the feed roller 11 moves in the direction of arrow A shown in FIG. Rotate for a fixed time. Due to the rotation of the feed roller 11, the single-cut sheet 6 is fed downward and stopped at a predetermined printing position. This completes the paper feeding operation, and then shifts to the printing operation.

Next, the operation of calculating the skew amount when the cut sheet 6 is skewed and fed will be described with reference to FIG.

In FIG. 4, the left and right detection sensors 9 are arranged on a straight line substantially orthogonal to the feeding direction B of the cut sheet 6,
Therefore, during the feeding of the cut sheet 6, one of the left and right detection sensors 9 first comes to the rear end portion in the feeding direction of the cut sheet 6,
That is, when the upper end is detected and then the other detection sensor 9 detects it, it is understood that the single-cut sheet 6 is skewed. For example, if the single-cut sheet 6 is skewed as shown in FIG. 4, when the single-cut sheet 6 comes to the position indicated by the chain double-dashed line, the detection sensor 9 on the right side first detects the upper end of the single-cut sheet 6. To do. From here, a fixed amount of the single-cut sheet 6 is fed to the feed roller 11 in the direction of arrow B. In the feeding process, when the cut sheet 6 reaches the position shown by the solid line, the other, that is, the left detection sensor 9 detects the upper end portion of the cut sheet 6. The skew amount of the cut sheet 6 is obtained from this time difference, and if this amount is not greater than a predetermined amount, the printing operation is continued. If it is more than the certain amount, it is determined that the curl is large, and the printing operation is performed. Without feed roller
Reversely rotate 11 and eject the single-cut sheet 6 upward. After discharging, the operator is informed that the cut sheet 6 is bent and fed by a lamp or the like, or re-feeding is performed assuming that the cut sheet 6 becomes vertical due to its own weight.

(Problems to be Solved by the Invention) However, in the above-described conventional apparatus, the cut sheet determined to have a large skew amount is forcibly discharged by the feed roller. Therefore, depending on the skew amount, the discharging operation may be performed. There was a problem that a jam might occur in the process of. This will be described with reference to FIG. FIG. 5 is an explanatory diagram showing an operation of discharging a skewed sheet.

In the figure, the single-cut sheet 6 determined by the left and right detection sensors 9 to have a large skew amount is fed upward by the feed roller 11 from the position indicated by the solid line.

When the single-cut sheet 6 is sent to the position indicated by the chain double-dashed line, it hits the left-side guide portion 8a of the rear seat guide at the position P. When the ejecting operation is further continued and the single-cut sheet 6 is fed to the position away from the feed roller 11, that is, the position indicated by the alternate long and short dash line, the amount of interference with the left guide portion 8a increases, and the single-cut sheet 6 is wrinkled and jams. There are cases where it reaches to.

Further, when the cut sheet causes a jam, the operator removes the cut sheet, but at this time, there is a problem that the jammed portion is broken and a part of the cut sheet remains in the apparatus.

The present invention has been made in view of the above problems, and an object of the present invention is to prevent a jam of a single cut by stopping the single cut in the device when the skew of the single cut of a certain amount or more is detected. It is to provide a method of prevention.

(Means for Solving the Problems) The means taken by the present invention to solve the above problems is to guide and feed single sheets set one by one by a guide member, and the guide member in the feeding direction. The skew detection amount of the voucher is calculated by two detection sensors arranged on a straight line near the end of the sheet and substantially orthogonal to the feeding direction, and the voucher skewed by a certain amount or more is fed from the guide member. In the skewed single sheet processing method in the single sheet feeder that removes on the downstream side in the feeding direction,
Guide the cut sheet with the guide member,
The sheet is fed to a position detected by both of the detection sensors, and the skew amount is calculated at the rear end of the cut sheet based on the detection time difference between the two detection sensors. Both of the two detection sensors return to a minimum distance for detecting the presence of a single-cut sheet and stop, and then an alarm is issued.

(Operation) The operation of the present invention based on the above configuration will be described. When calculating the skew amount of a single-cut sheet, set the trailing edge of the single-cut sheet to 2 in the feeding direction.
The individual detection sensors detect and perform. Then, for a single-cut sheet in which the skew feed amount is a certain amount or more, the two detection sensors are returned to the positions where the single-sheet presence is detected and stopped. This can prevent the occurrence of jams. Further, since the returning distance is the minimum distance at which the two detection sensors detect the presence of the single-cut, the single-cut does not jam when returning. Further, when removing the skewed single-cut sheet, the minimum distance is returned, which facilitates the removal.

(Embodiment) An embodiment according to the present invention will be described below with reference to the drawings.
Elements common to the drawings are given the same reference numerals.

FIG. 1 is a schematic structural diagram showing an embodiment according to the present invention.

In the figure, the single-cut sheet 6 is the left guide portion 8a of the rear seed guide and the right guide portion of the rear seat guide, as in the conventional example.
The sheet is fed between 8b, and a detection sensor 9 is arranged at a position where both ends of the cut sheet 6 pass. The detection sensor 9 is composed of a light emitting diode and a light receiving transistor as in the conventional example, and is connected to the control unit 16. A feed roller 11 to which a shaft 15 is attached is provided below both detection sensors 9. Although not shown, a pressure roller is pressed against the feed roller 11 as in the conventional example, so that the single-cut sheet 6 can be fed.
The shaft 15 is supported by a frame 17 and rotated by a motor 18. The motor 18 is connected to the control unit 16. Further, a buzzer 19 is connected to the control unit 16.

Next, the operation of the embodiment will be further described with reference to FIG. FIG. 2 is a flow chart showing the operation of the embodiment according to the present invention.

When the cut sheet 6 is inserted from above along the left side guide portion 8a and the right side guide portion 8b, the lower end portion of the cut sheet 6 is inserted between the feed roller 11 and a pressure roller (not shown). At this time, since the single-cut sheet 6 passes through the left and right detection sensors 9, the detection sensor 9 detects that the single-cut sheet 6 is set (step 1). As a result, the detection signal is transmitted from the detection sensor 9 to the control unit 16
Then, the control unit 16 sends a drive signal to the motor 18. As a result, the motor 18 is driven, and the feed roller 11 rotates in a direction for feeding the single-cut sheet 6 downward for a certain period of time (step 2). As a result, the single-cut sheet 6 is fed to the printing unit (not shown). When the feeding operation progresses and the rear end of the voucher 6 in the feeding direction, that is, the upper end passes through either of the left and right detection sensors 9, the upper end of the voucher 6 is detected (step 3). . If the left and right detection sensors 9 detect the upper end of the cut sheet 6 almost at the same time, the cut sheet 6 is fed straight.
When one of the detection sensors 9 detects first, the cut sheet 6 is skewed. From this point, the feed roller 11
Is rotated for a certain time, and the single-cut sheet 6 is fed further downward (step 4). As a result, when the single-cut sheet 6 is fed straight, it is fed to a predetermined printing position and stopped. When the cut sheet 6 is skewed, one detection sensor (right side in the case of FIG. 1) first detects the upper end of the cut sheet 6 and the other detection sensor (in the case of FIG. 1). Then, the skew amount is obtained from the time difference until the upper left portion of the cut sheet 6 is detected. Then, it is determined whether the skew amount calculated here is larger than a certain amount (step 5). If it is smaller than a certain amount, the single-cut sheet 6 is continuously fed as it is and stopped at a predetermined printing position. If the skew amount is larger than a certain amount, it is determined that the curve is large, and the cut sheet 6 is stopped at the position indicated by the solid line in FIG. 1, that is, the position where the skew amount is detected (step 6). A case where the skew amount is a certain amount or more will be continuously described. After stopping the single-cut sheet 6, the control unit
The motor 16 rotates the motor 18 in the opposite direction to the above for a certain period of time, and therefore also rotates the feed roller 11 in the reverse direction to feed the single-cut sheet 6 upward (step 7). The fixed time in this case is the time when the voucher 6 is sent at the position shown by the chain double-dashed line in FIG. 1, that is, the voucher 6 is sent by the minimum distance detected by both detection sensors 9. The skewed single-cut sheet 6 stops at the above position. As a result, the detection sensor 9 keeps the single-cut state, and the apparatus does not perform the recovery operation unless the skewed single-cut sheet 6 is removed. At this position, the single-cut sheet 6 is, as shown in FIG.
It does not interfere with the left-side guide portion 8a, or even if it interferes, it requires only a very small portion and does not lead to a jam. Here, the control unit 16 sounds the buzzer 19 and issues an alarm (step 8). That is, the operator is informed that the cut sheet 6 is bent and fed, and the removal of the cut sheet 6 is urged. When removing the skewed single-cut sheet 6, the guide unit (not shown) is rotated to remove the single-cut sheet 6.
Hold the lower end of the and pull it downwards. In the present embodiment, the single-cut sheet 6 is stopped relatively downward, so that the removing operation can be easily performed. When the operator removes the cut sheet 6 (step 9), the alarm state is released by the operator's recovery operation (step 10).

In step 5, if the skew amount of the cut sheet 6 is less than the predetermined amount, the sheet is fed to a predetermined printing position and then the printing operation is performed by the printing unit (not shown) (step 11). When the printing operation is completed (step 12), the feed roller is rotated in the reverse direction to eject the single-cut sheet 6 upward (step 13).

Needless to say, the lamp may be turned on as a means for issuing an alarm.

(Effects of the Invention) As described in detail above, according to the present invention, when a certain amount of cut sheets are skewed during feeding, the cut sheets are not forcibly discharged and are stopped in the apparatus. You can prevent jamming of votes. Further, when removing the skewed sheet, the sheet remains relatively below the device, so that it is easy to remove and does not break when removed.

In addition, the position where the skewed voucher is stopped is the position detected by multiple detection sensors, so even if the operator mistakenly performs the recovery operation before removing the voucher, It can be seen that is not removed. Therefore, since the device does not perform the recovery operation, there is also an effect that it is possible to prevent a single-cut jam caused by an erroneous operation of the operator.

[Brief description of drawings]

FIG. 1 is a schematic structural view showing an embodiment according to the present invention, FIG. 2 is a flow chart showing an operation of the embodiment according to the present invention, and FIG. 3 is a schematic side view showing a conventional cut sheet feeder, FIG. 4 is a schematic front view showing a conventional single-cut sheet feeding device, and FIG. 5 is an explanatory view showing an operation of discharging skewed sheets. 6-single-cut, 9-detection sensor, 11-feed roller, 16-control unit, 19-buzzer.

Claims (1)

[Claims] 1. A single-cut sheet, which is set one by one, is fed by being guided by a guide member, and is arranged on a straight line substantially orthogonal to the feeding direction in the vicinity of the terminal end portion of the guide member with respect to the feeding direction. The skew feeding cut sheet processing method in the cut sheet feeding device for calculating the skew feeding amount of the cut sheet by the two detected sensors and removing the cut sheet skewed by a predetermined amount or more on the downstream side in the feeding direction from the guide member. In, the single piece is guided by the guide member and the rear end is
The sheet is fed to a position detected by both of the detection sensors, and the skew amount is calculated at the trailing end of the cut sheet based on the detection time difference between the two detection sensors. A skewed single-cut sheet processing method in a single-cut sheet feeding device, wherein both of the two detection sensors return to a minimum distance for detecting the presence of a single-cut sheet and stop the same, and then issue an alarm.