SU931631A1 - Device for inserting ribbon between preset portions of sheet pile for sheeting machine - Google Patents

Description

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connected to the wheel of the first ratchet mechanism and the command sensor, with the wheels of the ratchets mounted coaxially, the second ratchet pawl in contact with the cam, and the command sensor mounted on the wheel of the second ratchet and electrically connected with the drive roller electromagnet.

FIG. 1 is a schematic diagram of the feed tape in the stack of paper; in fig. 2 is a schematic diagram of the rev counter of the main shaft of the sheet-cutting machine.

The device contains a tape feed mechanism and a rev counter for the main shaft of the sheet-cutting machine.

The tape feed mechanism consists of two paper feed rollers 1 and 2 with their periodically activated drive having a single turn coupling 3 connected to the electromagnet k. The sealing tape feeds the rollers from roll 5.

The counter of revolutions of the main shaft consists of the first ratchet mechanism including a wheel 6 with a dog 7, and a second additional mechanism including a wheel 8 with a dog 9. The dogs 7 and 9 are mounted on a common swing of the lever 10. The lever is driven in a known manner from the main shaft of the sheet cutting machine. On the ratchet wheel 6, the fist 11 is rigidly fixed, and on the wheel 8 a sensor 12 of the command, which turns on the track switch 13 (for example, a proximity switch).

The device works as follows.

The lever 10 rotates the ratchet wheel 6 every step one way. Together with the wheel, the fist 11 is rotated to the corresponding angle. The ratchet wheel 8 remains stationary while the pawl 9 is located on the convex part of the fist profile 11, since at this time there is no contact between the pawl and the teeth of the wheel. When the knuckle approaches the doggie, the latter rotates counterclockwise and engages with the teeth of the ratchet wheel B. When the lever 10 is turned, both wheels turn. On subsequent swinging of the lever as the fist turns, its trough leaves the doggie 9 and the doggie engages the teeth of the ratchet wheel 8 inwards

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is terminated. The wheel 8, therefore, will again stand up until the next approach of the depression of the cam to the dog 9. Therefore, unlike wheel 6, which rotates every cycle, the wheel 8 turns only during periods corresponding to the depression of the cam 11 against the dog 9. The command to turn on the electromagnet

 is given only for one revolution of the wheel 8, at the moment when the sensor 12 is located at the switch 13. When the magnet is turned on, the connecting pulleys 1 and 2 are connected to their drive through

one-turn clutch 3. The rollers are rotated one turn and feed the sealing tape from roll 5 to the foot I. Then the one-turn clutch is disconnected. Gasket 15

cut off from the tape in a known manner and remain in the foot.

The number of operating cycles of the machine between the two inclusions of the magnet, and hence the number of sheets between

pads in the foot, depending on the number of teeth of the wheels and the number of cavities on the fist. This is usually 250 or 500 sheets.

The use of the proposed device on sheet cutting machines will reduce the cost of its manufacture and increase the durability of its work in printing houses.

Claims (1)

1. Technical data sheet for sheet-cutting machines LR-1-20, LR 2-120 and LR-120 produced by the Khodorovsky plant Loligraphmash,