JPS60190371A - Paper feeder for printing machine - Google Patents

Abstract

PURPOSE:To provide a printing machine which reduces the load on a motor by separating a pinch roller from the platen to prevent possible jamming during the supply of a paper while a tractor mechamism is stopped when a paper is fed with the platen and pinch roller. CONSTITUTION:A control lever 5 is fastened at one end of a shaft 2, a roller arm 4 at the intermediate part and a switching lever 17 at the other end thereof. A rocking arm 19 is retained oscillably on support shafts 18 of transmission gears 12 and 13 and an idler gear 14 to be meshed with the transmission gear 13 is supported rotatably at one end thereof while the tip of a switching lever 17 connected at the other end thereof. When an operation lever 5 is put down to the right, the pinch roller 3 is separated from the platen 1 and with the turning of the arm 19, the idler gear 14 is meshed with a tractor gear 10 to feed paper with a tractor 8. When the operation lever 5 is put down to the left, the pinch roller 3 presses against the platen 1 and the idler gear 14 separates from the tractor gear 10.

Description

[Detailed description of the invention] Technical field of invention The present invention relates to a vapor feeding device for a printing machine.

Technical background of the invention and its problems First, a conventional example is shown in FIGS. 1 and 2. (1) is a platen, and the roller shaft 7) (parallel to this platen (1))
A roller arm (4) that rotatably supports a pinch roller (3) is fixed to 2), and an operating lever (5) is fixed to one end of the roller shaft 7N2).

One end of a toggle spring (6) is held by the operating lever (5), and the other end of the toggle spring (6) is held by a side frame (not shown) that supports the platen (1). A platen gear (force) is fixed to the end of the platen (1), and a tractor gear Ql is fixed to the end of the rotation input shaft (9) of the tractor mechanism (8).
A transmission gear α2 meshed with a drive gear aυ directly connected to a motor (not shown) and a transmission gear 13 meshed with a platen gear (7) are provided to rotate integrally on the same axis. An idler gear (circle) is provided which meshes with the gear 0.31 and the trough gear (II).

Therefore, when printing paper Q51 by feeding it onto the platen (1) by the tractor mechanism (8) as shown in path A, the rotation of the drive gear aυ is controlled by the transmission gear α2) (l).
(to) and the idler gear 01lIl to the rotational input shaft (9) of the tractor mechanism (8), and on the other hand, the power is transmitted from the transmission gear (131 to the platen gear). By tilting the pinch roller (3) away from the platen (1), the paper (151) is fed at nine feed pitches regulated by the circumferential speed of the sprocket (8a) of the tractor mechanism (8).

In addition, when feeding another paper (16) without using the tractor mechanism (8) as shown in path B, the operating lever (5)
) to the left to bring the pinch roller (3) into contact with the platen (1).

However, when the tractor mechanism (8) was transporting the paper (19) to a person on the route, an operational error caused the paper cutter (3).
) may be operated while being in contact with the platen (1). The circumferential speed between the platen (1) and the sprocket (8a) of the tractor mechanism (8) may differ due to manufacturing errors.If the circumferential speed of the platen (1) is faster, the platen (1) may On the other hand, there is no particular problem if it just slips, but if the circumferential speed of sprocket (8a) is faster, the paper r15) will loosen between the platen (1) and sprocket (8a) and a jam will occur. Also, even if the paper α6I is supplied to the outer circumference of the platen (1) through path B without using the sprocket (8a), and the paper (16) is fed to the platen (1) and the pinch roller (3), (8a) is driven, so the negative pressure applied to the motor is large and a motor with large power is required.

Purpose of the Invention The present invention has been made in view of the above-mentioned points. When the shiver is sent by a tractor mechanism, the pinch roller is reliably separated from the platen to prevent jamming, and the paper is separated from the platen and the pinch roller. The purpose of this invention is to stop the tractor mechanism when feeding the paper to reduce the load on the motor and to prevent erroneous operation of the paper feeding device of the printing machine.

Summary of the Invention This invention transmits the rotation of a motor from a transmission gear to a platen gear when feeding paper by a tractor mechanism, and also transmits the rotation of the transmission gear to a tractor gear fixed to an end of a rotation input shaft of the tractor mechanism via an idler gear. ,
When the pinch roller is brought into contact with the platen to feed the paper, the idler gear is retracted from the tractor gear to stop the tractor mechanism, thus reducing the load on the motor when feeding the shiver bar between the platen and the pinch roller, and further improving the operation. The pinch roller is moved toward and away from the platen by gripping the lever and rotating the roller shaft, but this operation is linked to the forward and backward movement of the idler gear relative to the tractor gear, so that when the tractor mechanism is driven, the pinch roller is securely moved regardless of whether caution is given or not. The structure is such that it can be moved away from the platen to prevent jamming from occurring.

Embodiment of the Invention An embodiment of the invention will be described with reference to FIGS. 3 to 6. Components that are the same as those described in FIGS. 1 and 2 are designated by the same reference numerals, and description thereof will be omitted. Roller shaft (
2) An operating lever (5) is fixed to one end, a roller arm (4) is fixed to the middle part, held by a frame (not shown), and swingably held by this support shaft H. An idler gear (14) that meshes with the transmission gear a3 is rotatably supported on the swing arm (LI).
The other end of 1 is connected to the tip of a switching lever αη.

In such a configuration, when the operating lever (5) is tilted to the right as shown in FIGS. 3 and 4, the roller shaft 7)
(21 rotates clockwise together with the roller arm (4) and the switching lever αη, the swing arm α9 rotates counterclockwise around the support shaft α mark, and the idler gear Q4) meshes with the tractor gear Qol. Therefore, the rotation transmitted from the drive gear συ to the transmission gear Oza■ is transmitted on one side to the platen gear (7) and on the other hand from the idler gear side to the tractor gear (II). For this, paper α9
(sprocket) as shown in Figure 4 with route A) (
8a) is fed to the outer periphery of the shim platen (1). At this time, due to the rotational movement of the roller arm (4), the shivinch roller (3) is always separated from the platen (1), which causes a difference in circumferential speed between the sprocket (8a) and the platen (1). Even if this occurs, the paper (19) will not loosen between the two and jam will not occur.

To feed the paper a0 between the platen (1) and the pinch roller (3), move the operating lever (5) to the left as shown in Figures 5 and 6, and move the roller shaft (2) and roller The arm (4) and the switching lever aη are rotated counterclockwise to bring the pinch roller (3) into contact with the platen (1). In this state, the platen gear (7) is being rotated by the motor, so the vapor stream is sent along path B. In this state, the swing arm 4 rotates clockwise around the support shaft, and the idler gear (141) retreats from the tractor gear (II), so the tractor mechanism (8) stops.Therefore, the drive gear aυ is driven. It is possible to reduce the load on the motor, downsize the motor, and save power.

Effects of the Invention Since the present invention is configured as described above, it is possible to prevent the occurrence of jams due to differences in the paper feeding amount of the tractor rafter mechanism, and also to feed the paper by bringing the pinch roller into contact with the platen. In some cases, the idler gear can be automatically retracted from the tractor gear to stop the tractor mechanism, which has the effect of reducing the load on the motor, downsizing the motor, and saving power.

[Brief explanation of drawings]

Fig. 1 is a side view showing a conventional example, Fig. 2 is a side view showing the operation of the operating lever, Figs. 3 to 6 are related to an embodiment of the present invention, and Fig. 3 is a tractor mechanism. Figure 4 is a side view showing the state in which the tractor is driven.
FIG. 5 is a side view showing the state in which the vapor is being fed, FIG. 5 is a side view showing the state in which the tractor mechanism is stopped, and FIG. 6 is a side view showing the state in which the platen and the pinch roller are feeding paper. 1...-platen, 2... roller shaft, 3...
Pinch roller, 4... Roller arm, 5... Operation lever, 7... Platen gear, 8... Tractor mechanism,
9... Rotation input shaft, 10... Tractor gear, 12
, 13... Transmission gear, 14... Idler gear, 17
...Switching lever, 18...Spindle, 19...Swinging arm Applicant: Tokyo Electric Co., Ltd.

Claims (1)

[Claims] A roller arm, in which a pinch roller is rotatably supported on a roller shaft parallel to the platen, is mounted in a non-rotating manner, and an operating lever is fixed to the end of the loan shaft, and a control lever is fixed to the end of the rotation input shaft of the tractor mechanism. A tractor gear is fixed, and a transmission gear that transmits the rotation of the motor to the platen gear fixed to the end of the platen is supported on a support shaft parallel to the platen, and an idler gear that is always meshed with the transmission gear is provided at one end. An intermediate portion of a rotatably supported swing arm is swingably attached to the support shaft of the transmission gear, and the roller shaft is rotated together with the row 2 arm to separate the pinch roller from the platen. A paper feeding device for a printing machine, characterized in that a switching lever is fixedly provided at an end of the roller shaft for causing the swinging arm to swing and meshing the idler gear with the tractor gear.