JPS6018368A - Form feeding device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a document feeding device having a sprocket hole (feeding hole).

BACKGROUND ART Conventionally, as a document feeding device having sprocket holes on both sides, a device in which a tractor or a bin/platen is driven by a motor has been used. In these devices, variations in the stop position of the motor directly result in variations in the amount of document feed, making it impossible to feed with such high precision. In order to improve the feeding accuracy, there are devices equipped with a detent mechanism independent of the above-mentioned mechanism, but these devices are quite expensive.

Therefore, an object of the present invention is to provide a form feeding device that is capable of highly accurate feeding and is inexpensive.

According to the present invention, the A position includes a drive shaft that reciprocates by a certain angle, a sprocket wheel and a detent wheel that are integrally coupled, and a detent wheel that is elastically pressed against the detent wheel. a detent roller; and a one-way bearing that supports the sprocket wheel and the detent wheel so that they can freely rotate only in the backward rotational direction with respect to the drive shaft, and the rotation angle of the drive shaft is controlled by the detent wheel. The rotation angle is smaller than the specified rotation angle.

Next, the present invention will be specifically explained in detail with reference to the drawings.

FIG. 1 is a plan view of an embodiment of a form feeding device according to the present invention, and FIG. 2 is a view taken along the line A--A in FIG. 1.

The sprocket wheel 1 and the detent wheel 2 are integrally molded, and a one-way bearing 10 is press-fitted inside thereof. This one-way bearing 1
0 and the drive shaft 3 passes through it. The drive shaft 3 is supported by side frames 15 on both sides so as to rotate smoothly, and is reciprocated by a predetermined angle by a drive source (not shown) connected to one end of the drive shaft 3. There is a groove between the sprocket wheel 1 and the detent wheel 2, and the frame 7 is curved into this groove so that it can rotate smoothly. The sprocket bin 9 belt 9 meshing with the sprocket wheel 1 can run smoothly using the surface of the guide fist case 8 fixed to the frame 7 as a guide. A servo shaft 14 passes through the end of the guide case 8, and the entire mechanism can move smoothly in the lateral direction (vertical direction in FIG. 1) on this shaft. The support shaft 14 is fixed to the side frames 15 on both sides and positions the inclination of the sprocket bin belt 90 in the running direction.

On the upper and lower sides of the guide case 8, paper presser plates 12 are supported by the frame 7 and are opposed to each other with sufficient clearance for the paper to travel, and are further pressed by presser plate springs 13 so as to be sandwiched between the upper and lower sides.

The paper press plate 12 is supported by a hinge to the frame 7,
Can be expanded up and down respectively. With the paper press plate 12 unfolded, the form is set in the sprocket bin portion of the sprocket bin/belt 9, and the paper press plate 12 is returned to its original position. A detent roller 4 that engages with the teeth of the detent wheel 2 is rotatable about a stud shaft 5, and is fixed at one end to a frame 7 by a torsion spring 6 against the detent wheel 2. It is pressed with a constant pressure. The stud shaft 5 is fixed to the frame 7, and the detent roller 4 is attached to the end of the stand shaft 5.
J-song 1 prevents removal. Since this example is intended for forms with sprocket holes at both ends, the mechanism including the sprocket wheel 1, detent wheel 2, etc. described above and the left and right A symmetrical (vertically symmetrical in FIG. 1) mechanism (indicated by chain lines) is provided.

Next, the feeding operation of this embodiment will be explained.

The drive shaft 3 is reciprocated by a predetermined angle by a drive source (not shown), and the sprocket wheel 1 and detent wheel 2 rotate together in the forward direction only during the period of rotation in the forward direction (see FIG. 1). The rotation angle penalty of the drive 1 and 3 is determined so that the rotation angle of both wheels 1 and 20 at this time is slightly smaller than one pitch of both wheels. Therefore, at the time when the forward rotation of the drive shaft 3 is completed, the detent roller 4 is engaged with the inclined portion of the teeth of the detent fist wheel 2. However, since the detent roller 4 is pressed against the detent wheel 2 by the elastic force of the torsion spring 60, a force acts to further rotate the detent wheel 2 in the forward direction.
The detent wheel 2 is rotated until the detent roller 4 falls into the valley of the detent wheel 2 (the one-way bearing 10 does not restrain relative rotation in this direction). In this way, the detent wheel 2 does not need to control the rotation angle of the drive shaft 30 with such high precision.
The sprocket wheel 1 can be rotated by a certain angle determined by the tooth pitch of the sprocket wheel 1, and the feed amount of the form can be determined with high precision. Note that when the drive shaft 3 rotates in the backward direction, the one-way bearing 10 and the drive shaft 30 are not constrained in any way.

FIG. 3 is a conceptual diagram showing the relationship between the detent wheel 2 and the detent roller 4 during the forward rotation described above. L corresponds to the angle at which the detent roller 2 is rotated by the forward rotation of the drive shaft 3, and L corresponds to the angle at which the detent roller 2 is rotated by the forward rotation of the drive shaft 3;
This corresponds to the specified rotation angle of the roller 2. (L-J-)
corresponds to the angle through which the detent fist wheel 2 is rotated by the action of the detent roller 4.

In the above-mentioned embodiment, the form is fed by the sprocket bin skewer belt 9 that engages with the sprocket wheel 1, but the sprocket wheel 1 can also be configured to feed the form directly. The sprocket bin 1 belt 9 can also be a chain in which sprocket bins are arranged.

As described above, the form feeding device of the present invention can easily increase the accuracy of the form feeding amount according to the processing accuracy of the detent wheel, and furthermore, the detent mechanism is integrated with the sprocket mechanism and has a simple structure. This is simple and can be achieved at a much lower cost than adding a separate detent mechanism.

According to the present invention, it is possible to achieve the effect of blinding a highly accurate and inexpensive form feeding device.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a view taken along the line A--A in FIG. 1, and No. 3N is a conceptual diagram for explaining the operation of the detent mechanism. 1... Sprocket battle wheel 2... Detent wheel 3... Drive @ 4... Detent roller 6...
Torsion spring 9...Sprocket bin 1 Belt 10...One-way bearing Figure 1 Figure 2

Claims (1)

[Claims] 1. A drive shaft that reciprocates, a sprocket wheel and a detent wheel that are integrally coupled together, a detent roller that is elastically pressed against the detent wheel, and a sprocket wheel that rotates reciprocally, and a detent roller that is elastically pressed against the detent wheel.
A sprocket comprising a wheel and a bearing that supports the detent wheel so that it can freely rotate only in the forward rotation direction, and the rotation angle of the drive shaft is smaller than the specified rotation angle of the detent wheel. A form feeding device with holes.