Cutter structure for folding machine

Abstract

The utility model discloses a cutter structure for a folding machine, which relates to the technical field of folding machines and comprises a center seam cutter, a head cutter and a ridge cutter. The center joint cutter is linked through a shaft fixed on the upper folding hinge and is used for longitudinally rotating, punching and cutting through paper; the head cutter is fixed to the circumferential punching roller and used for transversely punching and cutting through paper, a cutting edge is arranged on a cutter body along the long edge of one side of the cutter body, a plurality of first notches are formed in the cutting edge at intervals so that the cutting edge can be divided into a plurality of cutting sections, a plurality of second notches are formed in the cutting sections at intervals, and the second notches are communicated with the first notches. The cutting section is divided into a plurality of cutting teeth; the center seam cutter, the head cutter and the ridge cutter are improved, paper can be completely and instantly cut through and scratched, air in the paper after being folded can be completely and completely exhausted, a section after being folded is smoother, and the problem that the section is wrinkled is thoroughly solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of folding machine, especially a tool structure for folding machine. BACKGROUND

[0002] In many book printing enterprises in China, large-scale rotary printing machines are very common, which are fast and efficient, and can complete printing, folding and stacking at one time, but the machine is always unsatisfactory in folding, and when the paper completes printing and enters the folding mechanism, it needs to be folded instantly at a high speed of 30000 sheets per hour to become a 16 or 32 size book block, but the book block contains a large amount of air, which cannot be successfully squeezed out and discharged at once, causing irregular wrinkles in the book block and affecting the appearance quality.

[0003] The existing equipment manufacturers equip the folding mechanism with middle joint knives, top knives and back knives, among which the middle joint knives and back knives are respectively clamped on the upper and lower folding shafts, which can cut through the paper when rotating at high speed, facilitating the discharge of air after folding, and the top knives are installed in the circumferential punching roller, which can cut through the middle part of the book block, also facilitating the full discharge of air after folding, but the folding wrinkling problem has not been effectively solved. Figure 1 、 3 and 5, the middle joint knives, top knives and back knives are relatively close and each tooth width is relatively narrow, the original manufacturer's tool design has shallow blade and not enough tooth tip, which cannot completely cut through and break the paper instantly when folding on the high-speed printing machine, resulting in that the air in the paper after folding cannot be completely discharged and cleaned, and wrinkles are prone to occur, especially when printing thick paper and stacking book blocks, which seriously affects the product quality and production efficiency of the subsequent process. TECHNICAL PROBLEM

[0004] The technical problem to be solved by the utility model is that the original manufacturer's tool cannot completely cut through and break the paper instantly when folding on the high-speed printing machine, resulting in that the air in the paper after folding cannot be completely discharged and cleaned, and wrinkles are prone to occur, which seriously affects the product quality.

[0005] In order to solve the above technical problems, the technical scheme of the utility model is as follows:

[0006] A kind of knife structure for folding machine, including middle joint knife, head knife and back knife.The middle joint knife, by fixed device, is linked with upper folding roller, and is used to longitudinally rotate and punch through paper;The head knife is fixed on punching roller, and is used to transversely punch through paper, the head knife includes blade body, the blade body is provided with blade edge along one side long edge, a plurality of first notches are arranged on the blade edge to separate the blade edge into a plurality of cutting sections, a plurality of second notches are arranged on the cutting section to separate the cutting section into a plurality of cutting teeth;The back knife is linked with lower folding roller by fixed device, and is used to longitudinally rotate and punch through book back, the middle joint knife, head knife and back knife cooperate with folding mechanism to complete book folding.

[0007] Preferably, a blade edge is formed between two adjacent cutting teeth, and the inclination direction of the blade edge is consistent with the inclination direction of the blade edge.

[0008] Preferably, the blade edge in the second notch is an arc-shaped blade edge to separate the cutting section into a plurality of tapered cutting teeth.

[0009] Preferably, the cutting section is provided with chamfer at both ends.

[0010] Preferably, the cutting section is provided with 3-7 blade edges.

[0011] Preferably, the blade edges a of the middle joint knife are uniformly spaced, and the length of the blade edges a is 1-1.8 cm.

[0012] Preferably, the blade edges b of the back knife are uniformly spaced, and the length of the blade edges b is 1-1.5 cm.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] In the present application, a plurality of first notches are arranged on the blade edge of the head knife to separate the blade edge into a plurality of cutting sections, a plurality of second notches are arranged on the cutting section to separate the cutting section into a plurality of cutting teeth, a blade edge is formed between two adjacent cutting teeth, the arrangement of a plurality of blade edges is more conducive to puncturing paper, the increase of exhaust port also makes it easier to exhaust, and the pitch of the middle joint knife and the back knife is greatly improved, the use of the three knives can completely cut through and puncture the paper instantaneously, the air inside the paper can be completely exhausted and cleaned after folding, the book block after folding is more flat, and the problem of book block wrinkling is completely solved.

[0015] The blade edge in the second gap of the top knife is an arc-shaped blade edge, so as to separate the cutting section into a plurality of tapered cutting teeth. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 Fig. 1 is a structural schematic diagram of a top knife in the prior art;

[0017] Figure 2 Fig. 1 is a structural schematic diagram of a top knife in the prior art;

[0018] Figure 3 Fig. 4 is a structural schematic diagram of a middle knife in the prior art;

[0019] Figure 4 Fig. 4 is a structural schematic diagram of a middle knife in the prior art;

[0020] Figure 5 Fig. 5 is a structural schematic diagram of a back knife in the prior art;

[0021] Figure 6 Fig. 5 is a structural schematic diagram of a back knife in the prior art;

[0022] In the figure, 1 is a blade body, 2 is a blade edge, 3 is a blade edge, 4 is a second gap, 5 is a cutting tooth, 6 is a chamfer, 7 is a first gap, 8 is a cutting section, 9 is a blade edge a, and 10 is a blade edge b DETAILED DESCRIPTION

[0023] The specific embodiments of the utility model will be further described below in combination with the drawings. It should be noted that the description of these embodiments is used to help understand the utility model, but does not constitute the limitation of the utility model. In addition, the technical features involved in each embodiment of the utility model described below can be combined with each other as long as they do not conflict with each other.

[0024] As shown in Figure 2 , 4 and 6, the utility model discloses a knife structure for a folding machine, which comprises a top knife, a middle knife and a back knife, and the top knife, the middle knife and the back knife are connected through a folding mechanism to complete three times of folding of a sheet.

[0025] The top knife is fixed on a circumferential punching roller and is used for transversely punching and cutting through paper. As shown in Figure 2As shown, the top knife includes a blade body 1, the blade body 1 is provided with a blade edge 2 along one side of the long edge, a plurality of first notches 7 are arranged on the blade edge 2 in intervals, so as to separate the blade edge 2 into a plurality of cutting sections 8, a plurality of second notches 4 are arranged on the cutting section 8 in intervals, so as to separate the cutting section 8 into a plurality of cutting teeth 5, preferably, a blade edge 3 is formed between two adjacent cutting teeth 5, and the inclination direction of the blade edge 3 is consistent with the inclination direction of the blade edge 2. Among them, the blade edge 3 at the second notch 4 is formed by being obliquely cut at a certain angle with the blade body 1, and the inclination angle is between the inclination angle of the blade edge 2 and the angle perpendicular to the blade body 1. Further preferably, the blade edge 3 in the second notch 4 is an arc-shaped blade edge 3, so as to separate the cutting section 8 into a plurality of tapered cutting teeth 5. Through the arc-shaped blade edge 3, the cutting tooth 5 first contacts the paper cutting, and then the arc-shaped blade edge 3 between the cutting teeth 5 gradually contacts the paper cutting, thereby improving the cutting effect.

[0026] Preferably, the cutting section 8 is provided with a chamfer 6 at both ends, and the cutting section 8 is provided with 3-7 blade edges 3, and the number of blade edges 3 of each cutting section 8 can be the same or different. Specifically, the present application preferably has four blade edges 3 in the front section of the top knife and six blade edges 3 in the rear section, which is more than the four straight tooth blade edges 3 in the top knife in the prior art, and is more conducive to piercing the paper and increasing the exhaust port. Figure 1

[0027] The middle slit knife is fixed on the upper hinge shaft and rotates at high speed, and is used for longitudinal punching and cutting through the paper, as shown in Figure 4 The blade edges a9 of the middle slit knife are uniformly and spacedly arranged, and the length of the blade edges a9 is 1-1.8 cm, which is longer than the blade edges of about 0.4 mm of the middle slit knife shown in Figure 3 The length of the blade edges in the present application is longer, the breakage length of the cutting through paper is longer, and the exhaust is easier.

[0028] The back spine knife is fixed on the lower hinge shaft and rotates at high speed, and is used for punching and cutting through the book back. As shown in Figure 6 The blade edges b10 of the back spine knife are uniformly and spacedly arranged, and the length of the blade edges b10 is 1-1.5 cm, which is longer than the blade edges of about 0.3 mm of the back spine knife shown in Figure 5 The length of the blade edges in the present application is longer, the breakage length of the cutting through paper is longer, and the exhaust is easier.

[0029] The embodiments of the utility model are described in detail in combination with the drawings, but the utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, replacements and modifications can be made to these embodiments without departing from the principles and spirits of the utility model, and still fall within the protection scope of the utility model.​

Claims

1. A blade structure for a folding machine, characterized in that: The system includes a center seam cutter, a top edge cutter, and a spine cutter. The center seam cutter is linked to the upper folding roller via a fixing device and is used for longitudinally rotating and punching holes through the paper. The top edge cutter is fixed on the punching roller and is used for transversely punching holes through the paper. The top edge cutter includes a blade with a cutting edge along one long side. The cutting edge has several first notches spaced apart to divide the blade into several cutting segments. The cutting segments have several second notches spaced apart to divide the cutting segments into several cutting teeth. The spine cutter is linked to the lower folding roller via a fixing device and is used for longitudinally rotating and punching holes through the spine. The center seam cutter, top edge cutter, and spine cutter cooperate with the folding mechanism to complete the folding of the book pages.

2. The blade structure for a folding machine according to claim 1, characterized in that: A cutting edge is formed between two adjacent cutting teeth, and the inclination direction of the cutting edge is consistent with the inclination direction of the blade.

3. The blade structure for a folding machine according to claim 2, characterized in that: The cutting edge in the second notch is an arc-shaped cutting edge, so as to divide the cutting segment into a plurality of tapered cutting teeth.

4. The blade structure for a folding machine according to claim 3, characterized in that: The cut section has chamfers at both ends.

5. The blade structure for a folding machine according to claim 4, characterized in that: The cutting section is provided with 3-7 cutting edges.

6. The blade structure for a folding machine according to claim 5, characterized in that: The blade a of the center seam knife is evenly spaced, and the length of blade a is 1-1.8 cm.

7. The blade structure for a folding machine according to claim 6, characterized in that: The blade b of the back knife is evenly spaced, and the length of the blade b is 1-1.5 cm.

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