JPS6232201Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an intermittent feeding device for a roll sheet that intermittently feeds the roll sheet forward over a fixed length.

When printing on rolled sheets using a multi-color label printing machine, printing misalignment will occur if the sheet is fed unevenly, so the paper that is being fed intermittently must always be fed accurately by keeping the feeding amount constant. There is a need.

1 and 2 show a conventional intermittent feeding device. In this device, an inner ring 3 is attached to a roller shaft 2 of a feed roller 1, a clutch 5 is provided between this inner ring 3 and an outer ring 4 fitted on the outside thereof, and the outer ring 4 is moved forward and backward by rotation of a drive wheel 6. The rotation of the outer ring 4 in one direction is transmitted to the inner ring 3 via the clutch 5, and the rotation of the feed roller 1 causes the sheet P in contact with the outer circumference to move in a predetermined direction in one direction. I try to send the length.

By the way, as mentioned above, in a feeding device that uses a clutch, due to the structure of the clutch, it is impossible to reduce the engagement error (circular play) to zero, and the material is transported by the rotation of the feeding roller. A feed error inevitably occurs in the amount of sheet feed, and this cannot be avoided. Therefore, in order to improve the sheet feeding accuracy, it is needless to say that the error of the clutch during its rotation transmission must be reduced.

However, in the above-mentioned conventional feeding device, since the axis of the feed roller 1 and the axis of the clutch 5 are coaxial, the accuracy of the clutch 5 depends on the accuracy of feeding the sheet P conveyed by the feed roller 1. If a clutch 5 that is directly related and has low precision is adopted, the feeding error of the sheet P will become large, and the conveyance amount of the sheet P will become inaccurate.

Furthermore, if the outer diameter of the clutch 5 becomes smaller than the outer diameter of the feed roller 1, the engagement error of the clutch 5 will be magnified and transmitted to the feed roller 1 due to the dimensional difference between the two. Therefore, there is an inconvenience that a high-cost clutch with a large outer diameter must be used as the clutch 5.

Therefore, this idea solves the above problems and
It is an object of the present invention to provide an intermittent feeding device for a roll sheet, which is capable of transporting the roll sheet extremely accurately and also allows the adoption of an inexpensive clutch with a small outer diameter.

The configuration of this invention is that a driven gear on the roller shaft of the feed roller is fixed, and a pinion that meshes with this driven gear is rotatably supported by a gear case that is driven to rotate in forward and reverse directions at a set angle around the roller shaft. , fix the inner ring to the pinion shaft of the above pinion,
The outer ring fitted on the outside is supported by the gear case,
A one-way clutch is provided between the inner ring and the outer ring, so that when the gear case rotates in one direction, the inner ring and the outer ring are connected to rotate the feed roller by a predetermined angle.

An embodiment of this invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 3 and 4, a driven gear 13 is fixed to the roller shaft 12 of the feed roller 11, and a pinion 14 meshing with the driven gear 13.
A pinion shaft 15 is rotatably supported by a gear case 16.

The gear case 16 is rotatably supported around the roller shaft 12, and an arm 1 is attached to the outer periphery of the gear case 16.
7 is provided, and this arm 17 and the outer circumferential portion of a drive wheel 18 that continuously rotates in one direction are connected by a rod 19, and the rotation of the drive wheel 18 causes the gear case 16 to rotate by a set angle in the forward and reverse directions. It's becoming like that.

Note that the rotational drive means for the gear case 16 is not limited to the above configuration, and any other arbitrary mechanism can be adopted.

An inner ring 20 is attached to the end of the pinion shaft 15 that protrudes outward through the side plate of the gear case 16, and an outer ring 21 is fitted on the outside of the inner ring 20.
is attached to the gear case 16, and a clutch 22 is provided between the inner ring 20 and outer ring 21.

The clutch 22 may be of any type as long as it connects the outer ring 21 and the inner ring 22 in the rotational direction when the gear case 16 rotates in one direction.

Now, when the drive wheel 18 is rotated, the gear case 1
6 rotates around the roller shaft 12 in the direction of the set angle and the gear case 16 rotates in the direction of the arrow in FIG. 3, the pinion 14 starts to rotate due to engagement with the driven gear 13, At this time, the clutch 22 is actuated to connect the inner ring 20 and the outer ring 21 in the rotational direction. Therefore, the inner ring 20 is prevented from rotating with respect to the gear case 16, and the driven gear 13 rotates due to the rotation of the gear case 16 at a certain angle about the roller shaft 12, and the feed roller 11 rotates.
rotates at a set angle and conveys the rolled sheet P in contact with the outer periphery in one direction.

Furthermore, when the gear case 16 rotates in the opposite direction to the direction of the arrow in FIG. , and the feed roller 11 is held in a stopped state.

By the way, in the intermittent conveyance state of the sheet as described above, the clutch 22 that connects and releases the inner ring 20 and the outer ring 21 has some play in the circular direction, and this play affects the feed amount of the sheet P.
Since the pitch circle of the pinion 14 is smaller than the outer diameter of the clutch 22, which is coaxial with the pinion 14, the play of the clutch 22 is reduced due to the difference in outer diameter dimensions of the pinion 14 and the clutch 22.
Sheet P is conveyed with high precision. In addition, paper P
The material may be paper, plastic, aluminum or copper plate.

As described above, this invention is based on the idea that when a gear case that rotates in the forward and reverse directions at a set angle rotates in one direction, the clutch connects the outer ring and the inner ring in the rotation direction to prevent the pinion from rotating. When the feed roller rotates due to the engagement between the pinion and the driven gear, and the gear case rotates in the other direction, the clutch releases the connection between the outer ring and the inner ring and releases the pinion from rotating, so the feed roller stops. As a result, the sheet in contact with the outer periphery of the feed roller can be intermittently conveyed in one direction for a predetermined length.

In addition, the pinion shaft is located at an eccentric position with respect to the roller shaft of the feed roller, and the pinion shaft and the axis of the clutch are arranged coaxially, and the pitch circle of the pinion provided on the pinion shaft is set to the outer diameter of the clutch. Since it is made smaller than the size, the play of the clutch can be reduced in proportion to the ratio of the outer diameters of the clutch and the pinion, and the feeding accuracy of the rolled sheet can be improved.

Furthermore, since the driven gear is rotated via a pinion that is prevented from rotating, the feed roller can be rotated with extremely light force, improving the durability of the clutch compared to the clutch shown in Figure 1. can. In addition, many other effects can be achieved, such as the ability to use a small, low-cost clutch.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a conventional feeding device, Fig. 2 is a partially cutaway side view of the same as above, Fig. 3 is a longitudinal sectional front view showing an embodiment of the feeding device according to this invention, and Fig. 4 is same as above. FIG. 11...Feed roller, 12...Roller shaft, 13
... Driven gear, 14 ... Pinion, 15 ... Pinion shaft, 16 ... Gear case, 20 ... Inner ring, 2
1... Outer ring, 22... Clutch.

Claims (1)

[Scope of utility model registration request] A driven gear on the roller shaft of the feed roller is fixed, and a pinion that meshes with this driven gear is rotatably supported by a gear case that is driven to rotate in forward and reverse directions at a set angle around the roller shaft. An inner ring is fixed to the shaft, and a clutch is provided between the inner ring and an outer ring provided on the gear case to connect the inner ring and outer ring in the rotational direction when the gear case rotates in one direction. An intermittent feeding device for a roll sheet, characterized in that the pitch circle is larger than the pitch circle of the roll sheet.