JPH0431979B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention relates to a paper box manufacturing method in which paper boxes are manufactured by holding die-cut blank sheets between belts, moving them straight, bending them, and gluing them at predetermined positions. The present invention relates to a so-called folder gluer, and specifically relates to an improvement of a paper feeding device for a folder gluer.

<Prior Art> Conventionally, as this type of paper feeding device, one using vacuum suction and one using friction between a belt and a blank sheet have been generally used. It is about improvement.

The above-mentioned belt-type paper feeding device loads blank sheets cut into a predetermined shape onto a drive unit equipped with a plurality of endless belts with a relatively large coefficient of friction that rotate intermittently or continuously, and A shutter is provided at the front end in the direction of movement of the blank sheet, and a hopper portion is formed by a pair of side guides on both sides of the blank sheet. At this time, the gap between the lower end of the shutter and the belt is adjusted so that the blank sheets are reliably fed one by one to the next process.

<Problems to be Solved by the Invention> In the conventional paper feeding device configured as described above, when paper boxes called B-type boxes are made, blank sheets are fed straight to the direction of travel. The drawback was that the song became distorted. In the folder gluer, the blank sheet is held by a belt and the paper box making process is performed while moving straight, so if the blank sheet is fed from the paper feed section in a crooked state, it will be impossible to obtain a paper box with the specified shape. The problem is that it is possible.

<Means to solve the problem> As a result of investigating the cause of the bending during paper feeding, we found that the blank sheet in the B-type box is A as shown in Figure 2.
The surface is longer than the other B, C, and D surfaces, so B,
Even though the C and D sides pass through the shutter section, the A side has not yet completely passed through, so paper feed resistance is applied due to the weight of the blank sheet above it. On the other hand, the B, C, and D sides are in contact with the belt and are being fed. Also, while the B, C, and D sides of the next blank sheet come into contact with the belt and the sheet feeding operation begins, the A side does not yet come into contact with the belt. Therefore, at this time, the next blank sheet is already B in the direction of travel,
The C and D sides end up being advanced further than the A side, and when the blank sheet is fed, the sheet is fed in a crooked state from the beginning. In the series of paper feeding operations, the above steps are performed continuously.

In order to solve this problem, it would be good if it were possible to cut off the contact between the upper blank sheet and the belt until each blank sheet completely passes through the stacking section with the upper blank sheet.

As described above, when feeding the stacked blank sheets, the present invention utilizes cams, levers, etc. to bring the blank sheets into contact with the belt in accordance with the feeding timing, so that unnecessary parts do not come into contact with the belt. This is an attempt to control a non-contact state.
Further, as a support that comes into direct contact with the blank sheet, for example, a roller or a bar whose surface is coated with a low-friction material is used.

<Function> A plurality of supports 23, 23' (hereinafter described as rollers 23, 23') are provided as shown in Fig. 1 A to D. In Fig. 1 A, all of the rollers 23, 23' are raised. Therefore, the blank sheet and the belt are in a non-contact state. Figure 1 B shows rollers 23 and 2.
3' are all lowered, and the blank sheet and belt are in contact with each other, thus being in the feeding state. Figure 1C shows the state in which the B, C, and D sides of the blank sheet have passed through the shutter section, and some of the rollers 23 and 23' have risen and A
The surface is in contact with the belt and the paper feeding state continues,
Also, the B, C, and D sides of the blank sheets stacked on top of the blank sheet currently being fed are supported by the rollers 23 and 23' and are not in contact with the belt. FIG. 1D shows the state in which side A of the blank sheet has passed through the shutter section, and all of the rollers 23 and 23' have been raised, thus being in the same state as in FIG. 1A.

In this way, the roller 2 is adjusted to the paper feed timing.
By establishing the ascending and descending cycles of 3 and 23', the occurrence of bending of the blank sheet is completely eliminated.

<Embodiment> An embodiment of the present invention is shown in FIGS. 3 to 7 and will be described in detail.

In the figure, 1 is a frame, 2 is a shutter, and 3 is a pair of side guides. A plurality of belts 4 are provided between the driving roller 5 and the driven roller 6. Reference numerals 6 and 7 indicate drive shafts, which are driven by a drive source (not shown). Reference numerals 8 and 8' designate a pair of rotating bodies fixedly attached to the drive shaft 7, and a first transmission lever 9 and 9' is provided at a part of the rotating bodies. Reference numerals 10 and 10' designate second levers, which operate a set of two cams 1 as the rotating bodies 8 and 8' rotate.
1 and 11' are given rotational motion. Cam 11,
The outer periphery of 11' has convex parts 12, 12' and concave parts 13, 1
3'. Also, cam 11,
11' has long holes 14, 14' and screws 15, 15'.
a boss 17 fixed to the shafts 16, 16' by
17' can be fixed at any position. 18, 18' are cam floors, which are biased by springs 19, 19', and cam floors 11, 1
The levers 20, 20' are constantly in contact with the outer periphery of the cams 1', and provide movement to the levers 20, 20' in accordance with the movement of the cams 11, 11'. The levers 20, 20' have one end connected to the protruding shaft 21, 2.
It is fixed at 1'. The protruding shafts 21, 21' are moved by the levers 20, 20' and the cam floors 19, 19' to the concave and convex portions 12, 12', 1 on the outer periphery of the cams 11, 11'.
3 and 13', a certain rocking motion is performed. Further, a plurality of ejection levers 22, 22' can be set at arbitrary positions on the ejection shafts 21, 21'. Rollers 23, 23' are provided at the other ends of the projecting levers 22, 22', and these rollers 23, 23' come into direct contact with the blank sheet. Incidentally, the projecting shafts 21 and 21' are arranged independently at approximately the center of the frame 1, and each is supported at one end by a bearing.

In addition, the position of the rollers 23, 23' and the raising and lowering timing are optimized by adjusting the thrusting levers 22, 22' to the thrusting shafts 21, 2 so that they are optimized for the dimensions of the blank sheet.
1', and two concave portions 12, 12' on the convex portions of the outer periphery of the cams 11, 11', respectively, so that the states of A to D in Fig. 1 can be independently controlled. Set its position and length.

In this embodiment, the cams 11 and 1 are connected to the drive shaft 7.
Although the first levers 9, 9' are used to transmit power to the motor 1', it is not necessary to use the levers, and the same effect can be achieved by using a chain sprocket or a gear train. Also, the thrust shafts 21, 21'
On the other hand, the same effect can be achieved by applying a certain amount of oscillation using a linear drive mechanism such as an air cylinder, rack pinion, or linear motor.

Furthermore, the present invention is that the rollers 23, 23' control contact and non-contact between the blank sheet and the belt, and the rollers 23, 23' are directly attached to the tip of a linear drive mechanism such as an air cylinder, rack pinion, or linear motor. The same effect as expected by the present invention can be obtained even if one linear drive mechanism is provided between the belts and driven selectively depending on the dimensions of the blank sheet.

<Effects of the Invention> According to the embodiments described above, there is no occurrence of bending of blank sheets during paper feeding, and therefore it is possible to reduce the defective rate, and there is no occurrence of paper jams during the process. Effects such as being able to increase acceleration can be obtained.

[Brief explanation of drawings]

Figures 1A to 2D are explanatory diagrams of the operation of the present invention, Figure 2 is an explanatory diagram of a blank sheet, Figure 3 is a plan view of the present invention, Figure 4 is an explanatory diagram of the relationship between the rotating body and the transmission lever, and Figure 5 The figure is an explanatory diagram of the cam part, FIG. 6 is an explanatory diagram of the cam, and FIG. 7 is an explanatory diagram of the thrust lever. 2 is a shutter, 3 is a side guide, 4 is a belt, 5 is a drive roller, 7 is a drive shaft, 8, 8' is a rotating body, 9, 9' is a first transmission lever, 10, 1
0' is the second lever, 11, 11' are the cams, 12, 1
2' is a protrusion on the cam outer periphery, 13, 13' is a recess on the cam outer periphery, 17, 17' is a boss, 18, 18' is a cam floor, 20, 20' is a lever, 21, 21' is a thrust shaft, 22, 22 ' is a projection lever, and 23, 23' are rollers.

Claims (1)

[Scope of Claims] 1. Consisting of a shutter, a pair of side guides, and a plurality of belts, the blank sheet stacked between the shutter and the pair of side guides is separated and fed one by one from the lowest end. In the paper feeding device, at least two or more supports are arranged between the plurality of belts and at positions corresponding to the blank sheets, and the supports are arranged independently and in synchronization with the paper feeding timing. and a support drive device that drives the blank sheet so as to bring the blank sheet into contact with or out of contact with the belt. 2 The supports are connected to 2 independent
2. The paper feeding device according to claim 1, which is fixed at an arbitrary position on a book's ejection shaft, and the ejection shaft is driven by a cam or a linear drive mechanism in synchronization with paper feeding timing. 3. Claim 1, wherein a plurality of linear drive mechanisms are installed between the belts, a support is provided at the tip of each of the linear drive mechanisms, and the linear drive mechanisms are selectively driven in synchronization with paper feeding timing. Paper feeding device as described in section.