JPH03238262A - Sheet supply device - Google Patents

Abstract

PURPOSE:To prevent a sheet after recording from being contaminated by a part of a sheet supply device by providing a spur roller on at least either one of the upstream side and the downstream side of a paper discharge roller in a sheet feed direction. CONSTITUTION:A pitch roller 17 abutting against a paper discharge roller 12 is supported rotatably on a U-like leaf spring 16 attached to a front cover 15. Leaf springs 18, 20 are attached to the paper discharge roller 12 on the upstream and downstream sides in the sheet feed direction, and spur rollers 19, 21 are supported on the leaf springs 18, 20, respectively. Both spur rollers 19, 21 lead a sheet S which is discharged after recording, preventing the same from making contact respectively with the upper and lower parts 15a, 15b of the front cover 15.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for automatically supplying sheets to a sheet processing device that continuously processes multiple sheets, such as a recording device or a sorting/counting device. In sheet feeding devices [Prior art] -G. In sheet processing devices such as recording devices, 1 classification counting devices, and reading devices such as printers and copying machines, it is also possible to feed sheets manually. 2. Description of the Related Art A sheet feeding device that is detachable from a sheet processing device is used as a device that automatically separates and feeds sheets one by one.

In the above-described recording apparatus, recording methods include those using a wire dot method, a thermal method, a thermal transfer method, and an inkjet method. Among these, the inkjet method in particular forms a recorded image by jetting ink directly onto the recording sheet, so it takes a certain amount of time for the ink to dry completely, although there are differences depending on the type of recording sheet. Requires opening. While this unfixed recorded sheet is being fed within the recording device or within the sheet feeding device,
If the paper ejection roller is of the surface contact type, the ink is retransferred to the ejection roller, and the ink is retransferred to the recorded sheet passing over the ejection roller, thereby staining the sheet. In order to prevent this staining, a technique is generally known in which, for example, a spur roller having a small contact area is brought into pressure contact with the paper ejection roller.

FIG. 5 shows this type of sheet feeding device 2 recording device.

In the figure, 101 is a sheet feeding device, and a recording device 10
It is detachably attached to a sheet processing apparatus consisting of two parts. Examples of the recording device 102 include a printer and a copying machine.

The recording device 102 is provided with a paper feed roller 103, and pinch rollers 104 and 105 are disposed in pressure contact with the outer periphery of the paper feed roller 103. 10
Reference numeral 6 denotes a recording pad for recording on the sheet S, which is disposed facing the paper feed roller 103. An inkjet method is adopted as a recording method for C+-S.

A discharge roller 107 and a spur 108 that presses against the discharge roller 107 are provided above between the paper feed roller 103 and the recording head 1060.

The sheet feeding device 101 described above is a sheet feeding stacker 1.
09, and a paper feed roller 120 is disposed in front of this paper feed stacker 109. In front of the paper feed roller 110, a paper ejection stacker 111 is arranged at a predetermined interval to accommodate the recorded sheets +-S that have passed through the paper feed roller 103 in a stacked manner. The paper discharge stacker 111 has a stacker wire 111A.

Reference numeral 112 denotes a paper ejection roller, which is attached to a roller shaft 114 rotatably suspended between left and right side plates 113, 113. The paper discharge roller 112 is drivably connected to the recording device 102 by a gear train (not shown).

A front cover 125 is attached between the left and right side plates 113, 113, and a spur roller 116 is swingably attached to this front cover 1]5.
6 is pressed against the paper discharge roller 112.

Thus, the sheets S are stacked in the paper feed stacker o9. This sheet S is guided to the paper feed roller 101 in the recording device 102 by the rotation of the paper feed roller 110, and as the paper feed roller 103 rotates, the sheet S is guided to the pinch roller 104,
The paper is fed by frictional force with the paper feeding cola 103 based on the pressing force of the paper sheet 105 . Thereafter, the sheet S is sent between the discharge roller 107 and the spur 108, and is recorded by the recording head 106 during this time.

Furthermore, the sheet S conveyed by the discharge roller 107 and the spur 10B is pulled up by the paper discharge roller 112 and the spur roller 116 pressed against the paper discharge roller 112 and sent into the paper discharge stacker 111.

[Problem to be solved by the invention]

In the conventional sheet feeding device, the sheet) S is
If the sheet S is thick and strong, when the recorded sheet S is removed from the recording device 102, the sheet S will be
As a result, the printed surface of the sheet S comes into contact with the lower part 115a of the front cover 115. Therefore, stains occur on the printed surface of the sheet S.

Furthermore, when the sheet S slips out of the paper ejection roller 112 and jumps up, the printed surface of the sheet +-S comes into contact with the upper part 115b of the front cover 115, causing stains.

Furthermore, the sheet S is curled by the paper feed roller 103 during the paper feed operation, and the sheet S
When the sheet S is fed into the paper ejection stacker 111 to a certain extent, the ejection operation continues with the upper end of the sheet S hanging on the stacker wire IIIA, and the sheet S with the curling tendency is transferred to the ejection roller 112. When it comes out of the front cover 115, the printed surface of the sheet S comes into contact with the upper part 115b of the front cover 115, causing stains.

In particular, in the inkjet recording method, the ink may not be completely dry even when the sheet is ejected, and the sheet S with unfixed ink may come into contact with the front cover 115, causing the printing of the sheet S. dirt becomes noticeable.

The present invention has been made in order to solve the above-mentioned problems, and its purpose is to prevent stains on the printed surface of recorded sheets caused by the unique curling and "curling" of thick sheets. An object of the present invention is to provide a sheet feeding device that can perform the following steps.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a sheet feeding device that discharges sheets sent out from a sheet processing device one by one by this paper discharging roller, at least one of the upstream or downstream of the paper discharging roller in the sheet feeding direction. A spur roller is provided on one side.

Note that if the sheet is a postcard, a spur roller can be provided only at the postcard passing position.

[For production]

In the present invention, the recorded sheet is sent out from the sheet processing device by the paper ejection roller, and this sheet is
The sheet is guided by a spur roller on either the upstream or downstream side of the paper ejection roller in the sheet feeding direction, and movement of the sheet is suppressed.

〔Example] Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show a sheet feeding device according to an embodiment of the present invention.

In FIG. 1, numeral 1 denotes a sheet feeding device, which is detachably attached to a sheet processing device consisting of a recording device 2. As shown in FIG. Examples of the recording device 2 include a printer and a copying machine.

The recording device 2 is provided with a paper feed roller 3, and pinch rollers 4A and 4B are disposed in pressure contact with the outer periphery of the paper feed roller 3.

Further, a paper guide 3A is installed behind the paper feed roller 3. Reference numeral 5 denotes a recording head for recording on the sheet s, which is disposed opposite the paper feed roller 3. An inkjet method is adopted as a recording method for the sheet s.

A discharge roller 6 and a spur 7 that presses against the discharge roller 6 are provided above between the paper feed roller 3 and the recording head 5, and a spur cover 8 is further disposed above the discharge roller 6 and the spur 7. ing.

The spur cover 8 has an opening 8A through which the sheet S passes.

The sheet supply bag W1 has a paper feed stacker 9, and a paper feed roller 10 is disposed in front of the paper feed stacker 9. In front of the paper feed roller 10, a paper discharge stacker 11 is disposed at a predetermined interval to store recorded sheets S that have passed through the paper feed roller 3 in a stacked manner. The paper discharge stacker 11 has a stacker wire IIA.

As shown in FIG. 2, a paper ejecting roller 12 is attached to a roller shaft 14 rotatably suspended between left and right side plates 13 and 13. The paper ejection roller 12 is a gear train (not shown)
The recording device 2 is interlocked with and drivably connected to the recording device 2.

A front cover 15 is attached between the left and right side plates 13 and 13, and a U-shaped leaf spring 1 is attached to this front cover 15.
6 is attached, and the support shaft 16 is supported between the plate springs 16.
A pair of pinch rollers 17 are swingably attached to A. Further, a paper ejection roller 12 is attached to the front cover 15.
A U-shaped plate spring 18 is attached to the upstream side of the sheet feeding direction, and the support shaft 1 is pivotally supported between the plate springs 18.
A pair of spur rollers 19 are attached to 8A, and
A U-shaped temporary spring 20 is attached to the front cover 15 on the downstream side of the paper ejection roller 12 in the sheet feeding direction, and a pair of spur rollers 21 are attached to the support shaft 2OA pivotally supported between the leaf springs 20. It is being The above pair of spur rollers 21. The pair of pinch rollers 17. A pair of spur rollers 19 are arranged in a straight line in the vertical direction.

The value of the spring constant of the above temporary spring 18, 20 is required to be within a predetermined range, and if it is too small, the spur roller 18.
9 and 21 will come into contact with the front cover 15 and be damaged. In other words, the appropriate spring constant of the plate springs 18.20 is A, the lower limit of the spring constant at which the sheet S itself contacts the front cover 15 due to the force of the sheet S springing up due to the strainer J is B, and the lower limit of the spring constant of the sheet S is B. cover 1
5, the spring constant A is set so that C<A<B. As a result, even when receiving the force of the sheet S during feeding, the spur roller 19.2
A hold of 1 is performed.

Next, the operation of this embodiment will be explained.

First, sheets S are stacked in the paper feed stacker 9.

This sheet S is transferred to the recording device 2 by the rotation of the paper feed roller 10.
The paper is guided to a conveyance path formed between the inner paper feed roller 3 and the paper guide 3A. Then, the sheet S is sent to the paper feed roller 3 of the recording device 2, and as the paper feed roller 3 rotates, the sheet S is fed by the frictional force with the paper feed roller 3 based on the pressing force of the pinch rollers 4A and 4B. It will be done. Thereafter, the sheet s is sent between the discharge roller 6 and the spur 7, and is recorded by the recording head 5 in between.

Further, the sheet S conveyed by the discharge roller 6 and the spur 7 is pulled up by the paper discharge roller 12 and the pinch roller 17 that is in pressure contact with the paper discharge roller 12, and the paper discharge stunning force 11
sent within.

According to the above configuration, the spring constant of the leaf spring 18 is appropriately adjusted to meet the above-mentioned conditions, and the movement of the recorded sheet S is suppressed by the pair of spur rollers 19, so that the sheet S is When the sheet S passes through the opening 8A of the spur cover 8 and jumps up, it is possible to prevent the printed surface of the sheet S from touching the lower part 15a of the front cover 15 and causing stains.

In addition, the spring constant of the leaf spring 20 is appropriately adjusted to meet the above-mentioned conditions, and the movement of the recorded sheet S is suppressed by the pair of spur rollers 21. When the sheet s is flipped up, the printed surface of the sheet s can be prevented from touching the upper part of the front cover 15 and getting dirty.

Furthermore, when the sheet S with the curl J is removed from the paper ejection roller 12 by the paper feed roller 3 during the paper feed operation, the sheet hs is
Even if the printed surface of the sheet S tries to touch 5b, the sheet S
Since the printed surface of the sheet S is guided by the pair of spur rollers 21, it is possible to prevent the printed surface of the sheet S from touching the upper part 15b of the front cover 15, thereby preventing it from becoming dirty.

In this embodiment, an inkjet method is adopted as the recording method for the sheet S, but the printing method is not limited to this, and even if a wire dot method is used, for example, environmental conditions, sheet type, etc. A remarkable effect occurs when the ink is not fixed on the sheet due to the above factors. It can also be applied to a thermal method or a thermal transfer method.

Further, in this embodiment, as shown in FIG. 2, a pair of spur rollers 21. The pair of pinch rollers 17 and the pair of spur rollers 19 are arranged vertically in a straight line, but when the thick sheet to be fed is a postcard, as shown in FIG. Two pairs of spur rollers 31 in the center. A pair of spur rollers 32 is disposed upstream of the sheet feeding direction of the pinch roller 17. These pair of spur rollers 31. The pair of spur rollers 32 are located at two locations on both sides of the sheet S having the width of a postcard. Further, a pair of spur rollers 33 are disposed downstream of the pinch roller 17 in the sheet feeding direction.
3 is located at the center of the front cover 15 in the width direction.

Furthermore, in this embodiment, as shown in FIG. 2, a pair of spur rollers 21. A pair of pinch rollers 17. The pair of spur rollers 19 are arranged in a straight line in the vertical direction, but when the thick sheet is a thick wide sheet other than a postcard, the spur rollers are at a position corresponding to the postcard in the width direction as shown in Fig. 3. , the above-mentioned relationship C<A<B cannot be satisfied over the entire width direction, and the effect of the spur roller is particularly difficult to reach at both ends of the sheet, resulting in stains on the printed surface of the sheet. Therefore, in this case, as shown in FIG. 4, a large number of spur units 41 each consisting of a pair of spur rollers 41A and a plate 4IB are arranged in parallel upstream and downstream of the bin roller 17 in the sheet feeding direction. This can be done by setting up

In this embodiment, the pinch roller 17 is held by the leaf spring 16, and the spur roller 19.21 is held by the leaf spring 18.20, but the present invention is not limited to such an embodiment. For example, a rigid shaft to which a pinch roller or a spur roller is attached is passed across the inside width direction of the front cover 15, and this rigid shaft is swingably attached to the front cover 15 with a plate spring. Although this mechanism is large-scale, it eliminates variations due to differences in leaf springs, and allows the pinch roller and a plurality of spur rollers to suppress the movement of the sheet under almost the same conditions.

In addition, in this embodiment, as a sheet processing device,
Although the recording device 2 is mentioned, the present invention is not limited to this, and can also be applied to, for example, a sorting and counting device or a reading device.

Furthermore, in this embodiment, spur rollers are provided upstream and downstream of the paper ejection roller 12 in the sheet feeding direction.
A spur roller may also be provided either upstream or downstream of the paper discharge roller 12 in the sheet feeding direction.

(Effects of the Invention) As described above, according to the present invention, due to the r-strain J and r-wrap mJ peculiar to thick sheets, the printed surface of the recorded sheet is removed from parts other than the spur roller of the sheet feeding device. This has the effect of preventing stains on the printed surface of sheets (sheets) caused by contact with sheets.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a sea I/supply device according to an embodiment of the present invention. FIG. 2 is a perspective view showing the spur roller of FIG. 1. FIG. 3 is a front view of the inside of a front cover to which the present invention is applied when the thick sheet is a postcard. FIG. 4 is a front view of the inside of the front cover to which the present invention is applied when the thick sheet is a wide sheet. FIG. 5 is a sectional view of a conventional sheet feeding device. [Explanation of symbols of main parts] l... Sheet supply device 2... Recording device 12... - Paper ejection roller 19... Spur roller 21... Spur roller S... Sheet. Figure 2

Claims (2)

[Claims] (1) A sheet feeding device that discharges sheets sent out from a sheet processing device one by one by a sheet discharging roller, characterized in that a spur roller is provided at least either upstream or downstream of the sheet discharging roller in the sheet feeding direction. sheet feeding device. (2) The sheet feeding device according to claim 1, characterized in that a spur roller is provided only at a position where sheets of postcards pass.