JPH0413157B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention is designed to check whether a predetermined number of signatures are being supplied each time in a collating machine, and to issue a defective signal in the case of defective sheets. This invention relates to a device for checking the quality of signature supply for a collating machine.

(Prior art) In a collating machine, when feeding signatures (sheets) onto a downward conveyor, it is checked whether the signatures (sheets) are being fed well each time by a predetermined number of small sheets. Checking is extremely important in the bookbinding process, as, for example, if there is a defect in the supply of signatures, it may have to be corrected manually before being sent to the subsequent stitching process or other process. That's true.

However, conventionally, this has generally been left to a detection device that measures the thickness of the signature and detects abnormalities using a micro switch or other switch, or an electromagnetic relay.

(Problems to be Solved by the Invention) However, this method lacks functional stability during continuous operation, and it is difficult to maintain accurate and sensitive detection confirmation over a long period of time.

Also, even if the number of front edges of signatures is the same, the thickness may differ due to the folding process, feeding conditions, or some temporary problem in the feeding mechanism, or the number of front edges of signatures may vary by one or two sheets as necessary. In some cases, extra sheets or one or two sheets removed may be mixed in with the normal number of sheets, and in such cases, the permissible upper limit The quality of the number of signature sheets to be supplied must be determined based on the lower limit thickness setting value.

However, until now, there has been no suitable device capable of solving the above-mentioned problems, which has been considered a major problem in this field.

(Means for Solving the Problem) This invention was made to solve the above problem, and it is possible to properly check whether a predetermined number of signatures are always being supplied in a collating machine every time. The purpose is to provide equipment.

More specifically, the present invention includes a rotary encoder that magnifies and detects changes in signature thickness, a counting counter that counts signal pulses from the rotary encoder, and a counter that detects in advance the thickness of one signature. There is an input register where you can input the normal pulse value and the upper limit positive value and lower limit negative value allowed for it as set values, and the number of pulses from the rotary encoder is counted by a counting counter and compared with the set value of the input register to determine whether it is defective. The present invention relates to an apparatus for checking the quality of signature supply for a collating machine, characterized by comprising a comparison circuit that emits a signal when

The present invention will be described below in detail with reference to an embodiment of the drum-type collating machine shown in the drawings.

First, in FIG. 1 of the drawings, A is a drum-type collating machine that supplies signatures 6 one by one from above downward by a supply drum 1. Signature 6 between drum 1
When the lever enters as shown in the figure, the sector gear 5 at the other end of the lever 2, to which the trochanter 3 is attached at one end, rotates in the direction of the arrow. In this case, the trochanter 3 pivot point and the lever 2 pivot point 4
Since the distance between the pivot 4 and the pitch circle of the sector gear 5 is greater than the distance between the axis 4 and the pitch circle of the sector gear 5, the movement of the trochanter 3, that is, the thickness of the signature 6, becomes the rotational movement of the enlarged sector gear 5. Further, a large gear 12 is fixed to the shaft 10 of the pinion 7 that meshes with the sector gear 5, and a large gear 13 is fixed to the shaft 11 of the pinion 8 that meshes with the large gear 12.
is fixed, and the large gear 13 meshes with the fixed pinion 9 on the shaft of the rotary encoder 14.
Therefore, the rotation angle of the sector gear 5 is further sequentially expanded by the gear transmission and transmitted to the rotary encoder 14. That is, a rotary encoder 14 is provided to magnify and detect changes in signature thickness. Note that the signature 6 between the supply drum 1 and the trochanter 3
Since the movement of the trochanter 3 is unstable when the trochanter 3 is inserted, the timing switch 19 is used to set a separate thickness measurement position. 18 is a timing cam. Also, as the rotary encoder 14,
Absolute type, which is an absolute value type that determines the current position with the fixed position of the rotary encoder as 0°, or a single signal for two directions, forward rotation and reverse rotation, with a predetermined number of signals per rotation of the rotary encoder. You may use any of the incremental types that are emitted as .

The present invention also includes a counting counter 15 that counts signal pulses from the rotary encoder 14, and a normal pulse value (i.e., the value of the first signature) when the thickness of one signature 6 serving as a reference is detected in advance. 6 inserted between the supply drum 1 and the trochanter 3, detected by the timing switch 19 and stored, and the upper limit positive value and lower limit negative value (if no special settings are made) The number of pulses from the input register 17 and the rotary encoder 14, which can be input as a set value (pulse value determined as x% of the normal value), is counted by the counting counter 15, and compared with the set value of the input register 17 to determine if it is defective. A comparator circuit 16 is provided in each case, and a comparator circuit 16 is arranged to issue a "defective" signal when the test occurs.

From the above, the pulse value of the counting counter 15 when the signal of the timing switch 19 is input,
That is, if the count value is each of the following values, it is considered "defective".

(Normal value + Upper limit positive value) <Count value (Normal value + Lower limit negative value) > Count value (effect of the embodiment) First, the thickness of the first signature 6 as a reference is detected in advance and the The number of pulses, that is, the positive number
Suppose it is 300. If the upper limit positive value allowed for this is +60 and the lower limit negative value is -60, then the following cases are defective.

360 <count value, 240> count value. Then, when the drum-type collating machine A is started and the signatures 6 are sequentially fed downward, the thickness of each signature 6 is detected and the rotary encoder 14 detects the thickness of each signature 6. Converted to rotation angle. The number of pulses from the rotary encoder 14 for each signature 6 is counted by a counting counter and input to an input register 17.
The count value is 360 or more compared to the set value (300 ^±60 ),
Or if it is less than 240, a "bad" signal will be issued.

(Effects of the Invention) This invention is equipped with a rotary encoder that magnifies and detects changes in the thickness of signatures, and the signal pulses from the rotary encoder are counted by a counting counter. In addition to being able to reliably measure the number of counted pulses for each fed signature, the number of pulses counted for each fed signature is compared with the set value of the input register, and a "defective" signal is issued only in the event of a failure. It has excellent effects such as being able to reliably check whether a predetermined number of signatures are being supplied at all times during operation, and in the event of a defect, it can be quickly dealt with by a signal.

In addition, commands can be entered into the input register as set values using the normal pulse value when the thickness of one standard fold is detected in advance, and the upper limit positive value and lower limit negative value allowed for it, so even if the number of edge sheets is the same, the thickness If there are signatures with different number of signatures, or if the number of signatures has been added one or two extra pages or one or two signatures have been decreased as necessary, it is considered that the number of signatures with the normal number of signatures is the same. Even in the case where the sheets are mixed and supplied as appropriate, there is an outstanding effect that the quality of the supplied signatures can always be accurately checked by setting the upper and lower limit values.

[Brief explanation of drawings]

The drawings show an embodiment of the device according to the invention, and FIG. 1 is a front view of the main parts, and FIG. 2 is a system block diagram. 1... Supply drum, 2... Lever, 3... Trochanter, 4... Pivot, 5... Sector gear, 6... Signature,
7, 8, 9...Pinion, 10,11...Shaft, 1
2, 13...Large gear, 14...Rotary encoder, 15...Counter, 16...Comparison circuit, 17...Input register, 18...Timing cam, 19...Timing switch, A...
Drum type collating machine.

Claims (1)

[Claims] 1 A rotary encoder that magnifies and detects changes in signature thickness, a counting counter that counts signal pulses from the rotary encoder, and a normal pulse value and its tolerance when the thickness of one signature is detected in advance as a standard. There is an input register that can input the upper limit positive value and lower limit negative value as set values, and a counting counter counts the number of pulses from the rotary encoder, compares it with the set value of the input register, and issues a signal in the event of a failure. What is claimed is: 1. A device for confirming the quality of signature supply for a collating machine, characterized by comprising a comparison circuit having the following characteristics: