JPS621156Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a paper feed operation release device for a printing machine such as a rotary copying machine based on the number of sheets remaining.

Conventionally, this type of device utilizes the fact that a lever falls into the trough of a cam when the number of sheets remaining becomes zero, and when this is linked with the paper feed drive, the paper feed operation is canceled. Also known is a device that utilizes a weight falling into a hole in a paper feed table to link this with the paper feed drive to cancel the operation. However, both had the disadvantage of having a large number of components.

In view of this, the present invention has been developed to provide a paper feed system for a printing machine that uses fewer components and can cancel the paper feed operation based on a paper feed release signal such as when there is no paper remaining, or manually at any time. The purpose is to provide a release device. According to the present invention, this problem can basically be solved by using a solenoid in conjunction with an electric component.

Next, the present invention will be explained with reference to an embodiment of a rotary copying machine shown in the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a control cam that is rotated at a reduced speed by a main electric motor (not shown). 2 is an L-shaped lever rotatably supported on a shaft 3, at the end of one arm it carries a roller 4 which is pressed by a control cam 1, and at the end of the other arm it carries a roller 4 which is pressed by a control cam 1; It is connected to a link 28 that controls a pressure roller 27 that presses the. When the lever 2 follows the rotation of the control cam 1, the link 28 resists the spring force and moves the lever 2 within its maximum displacement range.
Therefore, the pressure roller 2
7 is rotated about a shaft 29 in a direction away from the printing drum 26. On the other hand, when the no-displacement range is reached, the link 28 is pushed and the pressure roller 27
contacts the printing drum 26 and printing is performed.

An L-shaped positioning plate 6 is rotatably supported on the shaft 3, and at the end of one arm there is a hook hole 6a for a spring 19 that biases it clockwise as seen in the figure.
A grooved cam 6b (FIG. 3) is provided in the middle part, and a vibration isolating shaft 7 is provided at the end of the other arm. Positioning plate 6
further includes first and second shoulders, which will be described later, on its back surface. A link 8 is pivotally supported between the lever 2 and the grooved cam 6b, so that the lever 2 and the positioning plate 6 can be connected. Groove cam 6b shown in FIG.
A, B and C respectively indicate the positions that can be occupied by the engagement pin 9 at the free end of the link 8. The link 8 can be rotated at a pivot point on the lever 2,
Its free end is biased counterclockwise in the figure by a spring 10, and a wire 11 is connected to this free end, and the other end is connected to a movable piece of a solenoid 12 in the opposite direction to the biasing direction. There is. Therefore, when the solenoid 12 is energized, the link 8 rotates clockwise against the force of the spring 10.

A shaft 13 is supported by the main body frame at a distance from the shaft 3, and an arm 14 is rotatably supported on this shaft. At the end of the arm 14 is a roller 1.
5 is rotatably supported, and the roller 15 is attached to the first shoulder 6c or the second shoulder 6d of the positioning plate 6.
can be supported. Further, a tension spring 18 is mounted between the tip of the arm 14 and the tip of a spring support portion 17 fixed to the side surface of the paper feed tray 16. The arm 14 is biased counterclockwise by this spring. Furthermore, a limit switch 20 is attached to the main body frame toward the upper side of the arm 14, and this limit switch opens and closes the input of an electric motor, etc. When the roller 15 is on the first shoulder 6c of the positioning plate 6, It does not operate when it is activated and supported by the second shoulder 6d.

The paper feed tray 16 has a shaft 22 supported by the main body frame.
It is now possible to swing around. Also, the paper feed tray 16
A limit switch 21 that issues a paper feed release signal
is fixed, and its actuator protrudes from the top surface of the paper feed tray 16 (Fig. 2), but when the paper 23 is set, its weight causes the paper feed tray 1 to
6 (Fig. 1). Fourth
The figure shows an electric circuit between the limit switch 21 and the solenoid, and the contact of the limit switch 21 closes to supply power to the solenoid 12 when its actuator is not pressed down.

The paper feed release device configured as described above operates as follows. In FIG. 1, the control cam 1 is indicated by the arrow 24
By rotating in the direction of the arrow 25, the lever 2 swings and printing is performed, while the paper feed roller 5 rotates in the direction of the arrow 25 to guide the paper 23 on the paper feed tray 16 through the paper feed path to the printing drum. are doing. During this time, the engaging pin 9 is inserted into the grooved cam 6b of the positioning plate 6 at positions B and C.
(Figure 3).

Assuming that the number of sheets 23 remaining on the paper feed tray 16 is now 0, the actuator of the limit switch 21 will protrude beyond the top surface of the paper feed tray 16, and at this time, the circuit state shown in FIG. do. As a result, the link 8 is pulled clockwise via the wire 11, and the engagement pin 9 at its free end is pulled into the grooved cam 6b.
occupies position A (Fig. 3). As a result, as the control cam 1 rotates, the engagement pin 9 remains at position A without reciprocating between positions B and C within its maximum displacement range.
rotate counterclockwise by a slightly fixed angle. As a result, the roller 15 at the tip of the arm 14 is disengaged from the first shoulder 6c of the positioning plate 6 and moves to the second shoulder 6d, and at this time, the intermediate portion of the arm 14 is supported on the vibration isolating shaft 7 It stops. As the arm 14 descends, the paper feed tray 16, carried by the arm 14 via the tension spring 18, rotates around the shaft 22 and descends to the state shown in FIG.
Therefore, the paper feed roller 5 becomes inoperable, and at the same time, the limit switch 20 is also deactivated, and power supply to the main motor is interrupted.

Note that when manually releasing the paper feed in the state shown in FIG.
descend to

In the embodiment described above, the limit switch 2
A preset counter for the number of sheets can be connected in parallel to the solenoid 1, and the paper feed release signal for the solenoid 12 can be supplied from various interlocking mechanical parts or independently.

As is clear from the above explanation, according to the present invention, by using electrical parts in the paper feed release device, the number of components is reduced, the structure is simplified, and paper feed can be released automatically, reliably, and at any time. It becomes like this. Furthermore, since it can respond to various electrical release signals, it can become a higher performance paper feed release device.

[Brief explanation of the drawing]

Figures 1 and 2 show the paper feed release device according to the present invention, showing a case where there is paper and a case where the number of papers is zero, respectively, and Figure 3 shows an enlarged view of the engagement pin of the groove cam of the positioning plate. Figure 4 shows the positions A, B and C that can be occupied by 9.
Figure 2 shows the electrical circuit of the device according to the diagram. 1... Control cam, 2... Lever, 3, 13, 2
2, 29... Axis, 4, 15... Roller, 5... Paper feed roller, 6... Positioning plate, 6a... Hole, 6b
...Groove cam, 6c, 6d...Shoulder, 7...Vibration isolation shaft, 8...Link, 9...Engagement pin, 10,1
8, 19... tension spring, 11... wire, 12... solenoid, 14, 17... arm, 16... paper feed stand, 20, 21... limit switch, 23... paper, 26... printing drum, 2
7...Pressiyarolla, 28...Link.

Claims (1)

[Claims for Utility Model Registration] A positioning plate 6 rotatably supported on the shaft 3 of a lever 2 that brings the pressure roller 27 into contact with and away from the printing drum 26 by being oscillated by the control cam 1.
and a link 8 which is actuated by a solenoid 12 and connects the positioning plate to the lever to follow the rotation; one end is rotatably supported and the other end is supported by the paper feed tray 16.
The paper feed tray contacts the paper feed roller 5 with the paper 23 sandwiched therebetween, in a state where it can be engaged with the positioning plate, and is disengaged from the positioning plate by the operation of the solenoid, so that the paper feed A paper feed release device for a printing press, comprising an arm 14 in a state where the paper feed table is separated from a roller.