JPH01148577A - Discharging device for printer - Google Patents

Abstract

PURPOSE:To contrive a stable discharging operation for a recording sheet through supporting the sheet between a plurality of sheet-pressing units and a discharging roller, irrespective of the width of the sheet, by biasing each of a plurality of spurs toward the discharging roller. CONSTITUTION:A plurality of spur units 26 are arranged on a spur shaft 5 at regular intervals, whereby a sheet-pressing spur 16 and a discharging spur 17 in each of the spur units 26 are biased toward a discharging roller 1 by a compression spring 18 and a torsion coil spring 25, respectively. By this, a sheet 6 can be securely maintained between the spur units 26 and the discharging roller 1 until it is discharged, and variations or localization of a holding force will not be generated depending on the width of the sheet. By appropriate control of the spring forces of the compression spring 18 and the torsion coil spring 25, an ideal pressing force can be set.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a printer discharge device, and more particularly to a printer discharge device including a discharge roller and a pressing member that presses a recording sheet against the discharge roller.

[Prior Art] In recent years, as printers that use cut sheets have come into widespread use, attempts have been made to optionally attach a cut sheet feeder to the printer. In this case, even if the feeder is mounted externally, it is generally necessary to separately provide power for it, which increases the number of parts and increases the cost, so printers with internal cut sheet feeders have been developed.

When such a feeder is installed internally, everything from the feeding mechanism to the ejecting mechanism must be installed in a limited space.In particular, the ejecting mechanism must be designed so that the printed sheet does not have to be held on the platen roller for a long time, and it is also possible to record the printed sheet. It is necessary to discharge the water accurately so as not to have a negative impact on the water.

FIG. 5 shows a general configuration example of a conventional printer equipped with this type of cut sheet feeder. In this figure, reference numeral 1 denotes a discharge roller that is mounted at a predetermined position on the shaft island of the discharge roller, and is made of a material with a large friction coefficient such as rubber. A plurality of engagement grooves I parallel to the axial direction for holding the edge
B is placed around it. 2 is a platen roller, and 3 is a friction roller. A spur holder 4 has a built-in spur for pressing the sheet against the discharge roller 1, and is rotatably attached to a spur shaft 5 at a position facing the discharge roller 1, and this shaft 5 is attached to a spur lever ( Spur shaft mounting plate) 7
It is biased towards the discharge roller 1 by the spring 8 via the . Reference numeral 9 denotes a recording head, for example, an inkjet recording head that records characters or images on a recording sheet by ejecting ink droplets, and 10 denotes a stacker from which the recording sheets are discharged.

Cut sheets for recording are stacked on a pressure plate 11, from which they are fed one by one by a feed roller 12 and a separation claw 13, and are transferred to a pinch roller 14, a friction roller 3, and a sheet (not shown in FIG. 6). 1 to the pan 15 to reach the position of the platen roller 2, the sheet is further moved upward by the platen roller 2, and is pressed and held between the sheet presser spur 16 and the discharge roller 17 by the sheet presser spur 16 and the discharge spur 17. The sheet presser spur 16 is biased toward the discharge roller 1 via the spur shaft 5 by the spring force of the spring 8 shown in FIG.
The ejector spur 17 is biased by a compression spring 18 towards the output roller, which allows the sheet 6 to be held taut in the correct recording position. In addition, 5A
is attached to the spur shaft 5, and the compression spring 18 is attached to the spur shaft 5.
This is a pin to hold it between the

When the sheet 1-6 reaches the recording position of the platen roller 2 in this manner, ink droplets are ejected from the inkjet recording head 5, and recording is performed on the sheet 1 and the sheet 6. The inkjet recording head 5 is mounted on a carriage 20 driven by a carrier motor 19, and reciprocates in the main scanning direction along a guide shaft 21. Furthermore, the platen roller 2 moves in the direction of arrow R (
(clockwise direction) to move the sheet 6 upward toward the discharge roller 1 side.

The rear end of the recorded sheet 6 is guided by a gear-shaped discharge spur 17 and falls into the engagement groove # of the discharge roller 1, and as the discharge roller 1 rotates in the direction of the arrow, the entire sheet 6 is stored on the stacker lo. be done.

At this time, the discharge spur 17 functions to feed the sheet 6 toward the stacker 1o without returning it to the spur holder 4 side.

[Problem that the invention seeks to solve]

However, as shown in FIG. 7, with such a conventional printer ejecting device, stable ejection can be achieved in the case of a sheet 6A having a width a, but when the sheet 6B has a width a, stable ejection can be achieved.
In this case, due to the deflection of the spur shaft 5, the sheet presser spurs 168 and 16G located at both ends come into pressure contact with the discharge roller 1, but a gap g is created between the sheet presser spur 16B located at the center and the discharge roller 1. There was a risk that stable emissions would not be achieved.

SUMMARY OF THE INVENTION An object of the present invention is to provide a printer discharge device that eliminates the above-mentioned drawbacks and can realize stable discharge of sheets of various widths.

[Means for solving problems]

In order to achieve this object, the present invention includes a plurality of sets of sheet pressing units each including a discharge roller for discharging a recording sheet and a plurality of spurs for pressing the recording sheet against the discharge roller. In a printer ejection device in which presser units are arranged on one support shaft and biased toward an ejection roller, and the recording sheet is ejected outside the machine by being held between a plurality of spurs and the ejection roller, The invention is characterized in that each of the spurs is biased toward the discharge roller.

[For production]

According to the present invention, each of the plurality of spurs in the plurality of sheet pressing units arranged in the width direction of the sheet is individually biased toward the ejection roller, and the sheet is held between the plurality of spurs and the ejection roller. Therefore, regardless of the deflection of the spur shaft or the size of the sheet, the sheet is held between the sheet or multiple discharge units and the discharge roller, and stable sheet discharge is always performed. can.

[Examples] Examples of the present invention will be described below in detail and specifically based on the drawings.

FIG. 1 shows a first embodiment of the invention. In this example as well, the spur shaft 5 fitted into the spur holder 4 is the fifth
As shown in the figure, the ejection roller 1 is
biased toward However, in this example, the upper end of the spur holder 4 is supported by the sheet presser spur 16 or its rotating shaft 168, and the sheet presser spur 16 is biased toward the discharge roller 1 by the spring force of the compression spring 18. . Also, 2
Reference numeral 4 denotes a discharge spur support member that is swingably supported around the rotation shaft 16, and a support shaft 17A of the discharge spur 17 is pivotally supported at the tip of the support member 24. Reference numeral 25 denotes a spring coil provided around the seat presser spur rotation shaft 16, and the spring force of this spring 25 causes the support member 2 to
4, the discharge spur 17 can be biased toward the discharge roller 1.

By arranging a plurality of spur units configured in this manner at predetermined intervals on the spur shaft 5, the sheet presser spur 16 is compressed by the spring force of the compression spring 18 at each spur unit 26 km, and the ejection spur is 17 can be biased toward the ejection roller 1 by the spring force of the torsion coil spring 25, thereby making it possible to reliably hold the sheet 6 between the ejection roller 1 and the ejection roller 1 until ejection. The holding force will not be influenced or shifted by the Note that here, the compression spring 18
By appropriately adjusting the spring force of the twisted coil spring 25, it is possible to set an ideal pressure contact force.

FIG. 2 shows a second embodiment of the invention. Here, 4Δ is an arc-shaped elastic portion formed by partially extending from the spur holder 4 made of an elastic body such as plastic, and one end of such elastic portion 4A is hooked to the spur shaft 5. As a result, the elastic force causes the spur holder 4 to move clockwise around the spur shaft 5.Thereby, the sheet presser spur 16 can be biased toward the discharge roller 1. .

Further, the ejection spur support member 24 is also formed of an elastic material such as plastic in this example, and a part of its lower end is extended as shown to form an elastic l1iIi24A, and a locking portion 4B provided on the spur holder 4. The end portion to the elastic arm 24 is locked.

By configuring the spur unit in this way, the ejection spur 17 can be biased toward the ejection roller 1 via the support member 24, and the force can be maintained on each of the sheet presser spur 16 and the ejection spur 17. You can make it happen.

FIG. 3 shows a third embodiment of the invention. In this example, the spur shaft 5
The compression spring 28 provided between the pin 5A attached to the pin 5A and the spur boulder 4 causes the seat presser spur 1 to be compressed via the spur holder 4.
At the same time, the compression spring 38 provided between the pin 5A and the discharge spur support member 24 biases the discharge spur 17 toward the discharge roller 1 via the support member 24. It was designed so that That is, in this example as well, in each of the spur units U, the sheet presser spur 16 and the discharge spur 17 can individually maintain the biasing force toward the discharge roller 1.

FIG. 4 shows a fourth embodiment of the invention. In this example, both the rotation shaft 168 of the sheet presser spur 16 and the support shaft 178 of the discharge spur 17 are both supported by the spur support member 34, and the spur support member 34 is proportioned to the spur holder 4. Axis 3
It is designed to be supported through 5. By configuring the spur unit U in this way, the spring force of one compression spring 28 is applied to both the sheet presser spur 16 and the discharge spur 17 via the alignment mechanism by the balancing shaft 35, and therefore, these The spurs 16, 17 can be biased towards the discharge roller 1.

In the above explanation, the discharge device of an inkjet recording device has been described as an example, but the application of the present invention is not limited to this, but can be applied to a wide variety of printers such as thermal type, thermal transfer type, wire tod type, etc. It goes without saying that the present invention can be applied not only to the spur unit for holding down the sheet, but also to the part A that presses the sheet against the discharge roller.

〔Effect of the invention〕

As described above, according to the present invention, each of the plurality of spurs is biased toward the ejection roller in each sheet holding unit provided at a position facing the ejection roller, so that the recording sheet is Regardless of the width, the sheet can be held between multiple sheet holding units and the discharge roller, ensuring stable discharge operation.

[Brief explanation of the drawing]

FIGS. 1, 2, 3, and 4 illustrate the first embodiment of the present invention.
Second. 5 is a perspective view showing an example of a printer equipped with a conventional ejecting device; FIG. 6 is a sectional view including the ejecting device shown in FIG. 5; FIG. 7 is an explanatory diagram showing a problem occurring in the discharge device when viewed from above. DESCRIPTION OF SYMBOLS 1... Discharge roller, 2... Platen roller, 3... Friction roller, 4... Spur holder, 4A... Elastic part, 4B... Locking part, 5... Spur shaft, 5A... Pin, 6... Sheet, 9... Recording head, 10... Stacker, 16... Sheet presser spur, 17... Ejection spur, +8.28.38... Compression spring , 24... Ejection spur support member, 24A... 1 unit t, 26.36, 46, 56... Spur unit, 35...
- Balanced axis.

Claims (1)

[Claims] It has a plurality of sets of sheet pressing units each including a discharge roller for discharging a recording sheet and a plurality of spurs for pressing the recording sheet against the discharge roller, and the plurality of sets of sheet pressing units are combined into one sheet presser unit. In the ejecting device for a printer, the plurality of recording sheets are arranged on a support shaft and biased toward the ejecting roller, and the recording sheet is sandwiched between the plurality of spurs and the ejecting roller and ejected to the outside of the machine. A discharge device for a printer, characterized in that each of the spurs is biased toward the discharge roller.