JPS62146866A - Medium accommodating mechanism - Google Patents

Abstract

PURPOSE:To improve reliability and lighten the labour of an operator by setting the diameter of a drum, arrangement position, and waiting position and suspending the revolution of the drum, restraining the top edge part of the medium at the waiting position when the medium is long, and then releasing the medium after the rear edge part is perfectly discharged, thus permitting the medium to be reversed free from adjustment independently of the length. CONSTITUTION:The diameter of a drum 3 which is proper for treating the shortest medium 1 among the medium 1 discharged from a printing machine 10, arrangement position, and a waiting position T immediately before a paper discharge stopper 5 are set. When the medium 1 is long, the revolution of the drum 3 is temporarily suspended, restraining the top edge part of the medium 1 at the waiting position T, and after the rear edge part is perfectly discharged from the printing machine 10, a chuck 4 releases the medium 1. Therefore, even if the medium 1 is long, the top edge part is certainly held, and the springing-up of the medium by its own restoring force is prevented, and the reversing operation can be certainly executed. Therefore, the reliability of the device can be markedly improved, and the labour of an operator can be lightened.

Description

Detailed Description of the Invention [Summary] The medium storage mechanism of the present invention has a structure in which a chuck holding the leading edge of the medium does not release the leading edge of the medium until the trailing edge of the medium is completely ejected from the printing device. It has become. Therefore, even if the medium is longer than the standard size, it can be reliably reversed.

[Industrial application field]

The present invention relates to an improvement in a medium storage mechanism installed in a printing device.

[Conventional technology]

FIG. 7 is a side view of essential parts showing an example of the configuration of a conventional medium storage mechanism.

As shown in the figure, the conventional medium storage mechanism includes a drum 3 that conveys the medium 1 ejected from the printing device 10 by rotation of the paper feed roller 2 to the stacker 20 side, and a drum 3 that fixes the medium 1 to the drum 3. It is composed of a chuck 4 for moving the medium 1, and a discharge stopper 5 for positioning the leading edge of the medium 1 being conveyed.

The operation of the medium storage mechanism will be explained below with reference to FIG.

(2) The leading portion of the medium 1 discharged in the direction of arrow A is fixed on the drum 3 at the initial position P.

Note that this fixing is performed by a chuck 4.

■ The drum 3, which is driven by a motor (not shown) and rotates in the direction of arrow B, holds the medium 1 held by the chuck 4.
The paper is transported to a position where the leading edge of the paper contacts the paper discharge stopper 5 (the chuck 4 is configured to move together with the drum 3).

■ When the leading edge of the medium 1 comes into contact with the paper ejection stopper 5,
The chuck 4 that had captured the medium 1 becomes inactive and releases the medium 1.

(2) The medium 1 released from the restraint of the chuck 4 is stored in the stacker 20 with its front and back reversed.

[Problems to be Solved by the Invention] However, in the conventional medium storage mechanism described above, the leading end of the medium 1 is released regardless of the length of the medium 1, so if the medium 10 is long, There was a problem in that the released medium 1 would jump up in the direction of arrow C due to its own restoring force, and the reversal operation would not be performed properly.

As a means to solve this problem, there are methods such as changing the distance between the printing device 10 and the paper ejection stopper 5, or changing the diameter of the drum 3, but both methods have problems in terms of operability and cost. There are some drawbacks and it is difficult to employ.

The present invention provides a medium storage mechanism that can easily and reliably turn over the medium 1 without changing the diameter or position of the drum 3 even if the length of the medium 1 changes.

[Means for solving problems]

As shown in the embodiment diagram of FIG.
The drum diameter and drum arrangement position suitable for processing the shortest medium among the media 1 ejected from the machine are set, and a standby position T point is set almost immediately before the paper ejection stopper 5. If the length of the medium 1 is long, the rotation of the drum 3 is temporarily stopped while the leading end of the medium 1 is restrained at the standby position T point, and the trailing end of the medium 1 is finished being ejected from the printing device 10. The chuck 4 is configured to release the medium 1 from the drum 3 afterwards.

[Effect]

With this configuration, even if the medium 1 is long, the leading edge of the medium 1 is securely held, so the phenomenon of the medium 1 bouncing up due to its own restoring force does not occur, and the reversing operation is accurate. is executed.

〔Example〕

The present invention will be described in detail below based on embodiments shown in the drawings.

FIG. 1 is a side view of essential parts showing one embodiment of the medium storage mechanism of the present invention, and the same parts as in FIG. 7 are given the same reference numerals.

As shown in FIG. 1, the medium storage mechanism of the present invention includes an optical sensor D that detects the medium 1 sent out via the paper ejection roller 2.
S and the cam 6 which is attached to the rotating shaft 7 of the drum 3 (=l)
and a pair of cam switches 5ill and SW2 whose 0N10FII is controlled by the cam 6,
In front of the paper ejection stopper 5 (on the left side of the paper ejection stopper 5 in the figure) is a standby device that determines the subsequent operations of the drum 3 and chuck 4 when the leading edge of the medium 1 has been conveyed just before the paper ejection stopper 5. A position T point is set.

If the medium 1 is not detected by the optical sensor DS when the leading edge of the medium 1 has been conveyed to just before the paper ejection stopper 5, that is, if the feeding of the medium 1 has been completed, then the waiting position T point Ignoring this, the drum 3 continues to rotate, and the chuck 4 releases the medium 1. On the other hand, when the media handling is detected by the optical sensor DS, that is, when the feeding of the medium 1 is not completed, the drum 3 is temporarily stopped at the standby position T point, and the chuck 4 holds the medium 1 while holding the medium 1. The system waits until the sending of the first message is completed.

Therefore, in the latter case, the leading edge of the medium 1 is fixed in front of the paper ejection stopper 5 as shown by the dotted line, and waits until the trailing edge has been fed out, and is released only when feeding is completed. No reversal errors occur.

The present invention will be described in detail below with reference to the operation timing chart shown in FIG. 2 and the side view of the circuit configuration shown in FIG. The reference numerals in the text correspond to the reference numerals used in FIGS. 1 and 2 above.

■ The optical sensor DS detects the passing of the leading edge of the medium 1 by 1. A chuck drive signal CDS and a motor drive signal MDS are output from the delay circuit at timing t2, which is a time τ after detection.

Now, the drum 3 starts rotating by gripping the medium 1.

■ In the case of the short medium ■, the light shielding by the medium I is released at timing t, and the output of the optical sensor DS becomes 0. Therefore, even if the drum 3 rotates in this state and the cam switch SW2 closes, the motor M will not be activated. The rotation does not stop and the cam switch SWI
It rotates continuously until the timing t5 when is closed.

■ In the case of a long medium ■, when the output of the cam switch SW2 becomes 1 at timing t4, the sensor DS detects the medium ■
Since the inverted output is in the state of 1 because the light is blocked by
A motor stop signal MSS is output through the D gate and the OR gate, and the motor M is temporarily stopped.

■ In this state, only the feeding of medium 1 progresses, and sensor D
When S detects passage of the trailing edge of the paper at timing t6, motor stop signal MSS becomes O, motor M is restarted, and rotates until timing t6 even though SWI is turned ON. At this time, the chuck 4 is also released and the reversing operation of the medium 1 is completed.

FIG. 4 is a perspective view showing an embodiment of the drum structure.

The figure shows an example in which the drum 3 was manufactured using a symmetrical plastic mold in which the cylinder was divided into two in order to realize mass production of the drum 3, and the protrusions provided in the thick part of the drum 3, which was formed into a semi-cylindrical shape, were A desired cylindrical shape can be easily obtained by mutually engaging the holes 3a and 3b. The groove 3' formed on the outer periphery will be explained with reference to FIG.

FIG. 5 is a view showing a modified example of a partial structure of the paper ejection stopper, in which (a) is a side view of the main part, and (a) is a front view of the main part.

In the case of this modification, the groove 3 provided on the outer periphery of the drum 3
The convex portion 5' of the paper discharge stopper 5 is inserted into the inside of the paper discharge stopper 5. By configuring a portion of the paper ejection stopper in this way, interference between the medium 1 and the drum 3 is reduced, and the medium 1
separation operation is facilitated.

FIG. 6 is a diagram for explaining an embodiment of the reversing auxiliary plate, which is a member constituting the medium storage mechanism, and +a+ is a perspective view of the main part showing the shape and mounting structure of the member; bl is a perspective view showing the external appearance of a drum equipped with a reversing auxiliary plate.

As shown in FIGS. 6(a) and 6(b), the reversing auxiliary plate 13
is a band-shaped elastic member whose tip is bent at right angles, and the bent tip is formed with an engagement hole 13a that engages with the protrusion 3a of the drum 3, and the drum 3 is divided into two parts.
The structure is maintained by combining the Therefore, it is possible to easily and reliably attach the reversing auxiliary plate 13 to the drum 3, which is made of a material such as a polyester film, which is not compatible with bonding means such as adhesive.

〔Effect of the invention〕

As explained above, the present invention is capable of reliably reversing the medium without any adjustment, regardless of the length of the medium, which greatly improves the accuracy of the device, and in particular significantly reduces the burden on the operator. .

[Brief explanation of drawings]

FIG. 1 is a side view of essential parts showing an embodiment of the medium storage mechanism of the present invention, FIG. 2 is a timing chart diagram for explaining the operation of the present invention, and FIG. 3 is a diagram of an embodiment of the circuit configuration of the present invention. FIG. 4 is a perspective view of an embodiment of the drum structure of the present invention, and FIG. , Figure 6 (a
1 and Cb+ are perspective views showing an example of the member structure of the reversing auxiliary plate used in the present invention and an assembled state, and FIG. 7 is a side view of main parts showing an example of the structure of a conventional medium storage mechanism. In the figure, 1 is a medium, 3 is a drum, 3a is a protrusion, 3b is a hole,
3' is a groove, 4 is a chuck, 5 is a paper discharge stopper, 5' is a convex portion, 10 is a printing device, 13 is a reversing auxiliary plate, 13a is an insertion hole, 20 is a stacker, DS is an optical sensor, and SWI. SW2 indicates a cam switch, P indicates an initial position, and T indicates a standby position. Figure 1: Anti-fn cold B Money's sudden attack C: Figure 6: Figure 7

Claims (1)

[Scope of Claims] A medium storage device equipped with a drum (3) that turns a medium (1) discharged from a printing device upside down by rotation, and a paper discharge stopper (5) that positions the reversed medium (1). A mechanism, the medium storage mechanism is configured to store a medium (
1); a chuck (4) that captures the leading edge of the ejected medium (1) at an initial position P set on the drum (3); A pair of cam switches (SW1) and (SW2) that control the operation of the chuck (4) and the rotation of the drum at a predetermined rotational position in response to rotation, one of the cam switches. A medium storage mechanism characterized in that the rotation of the drum is selectively stopped temporarily depending on the state of the medium (1) when the rotational position (T) of the drum is detected by SW2.