JPS6260983B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to an apparatus for sequentially manufacturing bags from a thermoplastic synthetic resin bag material strip, and in particular,
The present invention relates to a device for correctly transporting bag material strips on which trademarks, characters, patterns, etc. corresponding to each bag are displayed.

(Prior Art) This type of device includes a rack that reciprocates in conjunction with a crank rod whose one end is pivoted to a crank fixed to a continuously rotating main shaft, and a pinion shaft that meshes with one of sector gears. An electromagnetic clutch brake is provided between the transmission mechanism and the pair of clamping type transfer rollers (conveyor), in which the clutch is engaged only during the feeding stroke of the crank, and the brake is released, and the connection point between the fan-shaped gear and the crank rod, One of the coupling points between the crank and the crank rod is provided on a slider that moves along a guide provided in the radial direction of the crank or sector gear, and is threadedly engaged with the slider to connect the crank or sector gear. A threaded rod is provided in one of these in the radial direction of the device, and during operation of these devices, the threaded rod is reversibly rotated to change the eccentricity of the slider and rotate at one time of the transfer roller. BACKGROUND ART Bag making machines are known that have a feed dimension changing device that can change the rotation angle.

When using this type of bag-making machine to manufacture bags from bag material strips that display trademarks, other characters, patterns, etc., register marks displayed at the same pitch as these trademarks (even if part of the trademark is the same) are used. ) The rotation angle at which the transfer roller operates at one time is determined by changing the eccentric dimension of the slider of the above-mentioned feed dimension changing device so that a dimension slightly larger than the pitch of A device detects the register mark, releases the clutch of the electromagnetic clutch brake, stops the rotation of the transfer roller that conveys the bag material strip, and the size transferred at one time matches the pitch interval of the register mark. The rotation angle of the transfer roller is controlled so that the

(Problem) However, the pitch of the register mark printed on this type of bag material strip is due to the uneven tension applied to the bag material strip during printing and the tension applied to the bag material strip when it is rolled up and stored. It is not uniform over the entire length of the
For seeds sown over a distance of 10,000 m, there may be a considerable difference (10 mm to 20 mm) between the pitch at the center and the pitch at the outer periphery.

In such a case, in a conventional bag making machine, the bag material strip is set in the bag making machine, and before the movement starts, the eccentricity of the above-mentioned connection point of the crank rod or the connection point of the crank rod and the fan-shaped gear is adjusted. Predicting the dimension where the pitch of the register mark displayed on this bag material band is the longest, and determining the eccentricity dimension of the slider so that it will be fed out slightly longer, for example, about 10 mm, than this, I am driving while fixing that position.

However, the offset dimension of the mover determined in this way is only a prediction, and when the dimension transferred at one time becomes shorter than the pitch of the register mark, it cannot be controlled using the conventional method. Therefore, there is a tendency to set the above-mentioned offset dimension so that the material is fed out at a considerably long length.

Therefore, when this known device is operated, the speed of the transfer roller changes in a sine curve for each transfer period, so that the transfer roller speed changes in the part of the bag material strip where the pitch of the register marks is shortened. The electromagnetic clutch has to be removed and the electromagnetic brake applied while the machine is still rotating at a considerable speed, which not only causes severe wear and tear on the brake shoe, but also causes large vibrations and noise from the machine, which can cause the brake shoe to slip. As a result, dimensional errors during transfer tend to occur, shortening the life of the machine as a whole.

In order to eliminate this type of problem, the current situation is that a skilled worker is always on watch and manually adjusts the offset dimension of the slider.

(Problems to be Solved) The purpose of the present invention is to improve the drawbacks of the conventional device as described above. According to the register mark pitch during operation of the device, the slider is first automatically adjusted to match the slightly longer dimension, and the feed stroke of the crank or sector gear is adjusted accordingly. The register mark is always detected by the mark detection device at a constant location near the end, and the electromagnetic clutch brake is activated when the transfer roller reaches a low speed to ensure accurate braking without uneven braking. The purpose is to enable transport, reduce vibration and noise of the equipment, and extend the life of the equipment.

Another purpose is that even when two or more bag material strips are transferred by the set of transfer rollers, the same purpose as described above is achieved when one bag material strip is transferred. In addition, using this as a reference, the transfer dimensions of all bag material strips can be transferred in accordance with the register mark pitch so that the positions of two or more bag material strips are lined up with few errors in the transverse direction. It is to do so.

(Means for Solving the Problems) The present invention achieves the above-mentioned object, and uses the above-mentioned known device as a prerequisite, and synchronizes the rotation of the main shaft to which the crank is fixed, and the feed stroke of the crank. Near the end, a synchronizing signal generating device for generating an output signal and a mark detecting device for detecting register marks displayed at approximately equal intervals on the bag material strip transferred by the transfer roller are provided. The output signal of one device is input,
An order determining circuit is provided that determines the order of these input signals and outputs a positive or negative output signal depending on the difference between cram schools, and when the time difference between this and the input signal is greater than a certain time difference, an output signal is generated. A gate circuit is provided, and an output signal from the gate circuit is transmitted, and a signal when the input signal from the synchronization signal generator comes first and the input signal from the mark detection device comes later causes the transfer roller to A feed dimension changing drive device is provided that moves in a direction to increase the feed dimension and operates in a direction to shorten the feed dimension of the transfer roller in response to a signal when the order of the two input signals is reversed. This is a bag material band transfer dimension control device in a bag making machine that uses a bag making machine.

In another invention, with the above-mentioned known device as a prerequisite, a plurality of bag material strips are conveyed in parallel by the pair of pinching type transfer rollers, and each of the bag material strips has a transport path. Mark detection devices are provided independently to detect register marks displayed at regular intervals, and one of these mark detection devices is synchronized with the main shaft to which the crank is fixed, and the crank feeding stroke is completed. A synchronizing signal generating device that emits an output signal is provided nearby, the output signals of these two devices are taken as input signals, and the order of these input signals is determined,
An order judgment circuit is provided that outputs a positive or negative output signal depending on the difference in the order, and a gate circuit is provided that outputs an output signal when the time difference between this and the two input signals is greater than a certain time difference, An output signal is generated from this gate circuit, and when the input signal from the synchronizing signal generator comes first and the input signal from the mark detection device comes later, the feed size changing device changes the feed size of the transfer roller. A feed size changing drive device is provided which operates the feed size changing device in a direction to increase the feed size of the transfer roller when the order of the two input signals is reversed, and operates the feed size changing device in a direction to shorten the feed size of the transfer roller. A control device is provided which contacts each material strip independently and applies a transfer load, and this device applies a transfer load to the mark detection device that first issued the mark detection signal among the several mark detection devices. This is a bag material strip transfer dimension control device in a bag making machine, characterized in that the corresponding control device is a device that controls the duration during the next transfer period.

(First Embodiment of the Invention) The apparatus of the present invention will now be described based on the illustrated representative embodiment.

In the figure, 10 is a bag making machine, and its machine frame 1
A main shaft 11 supported by a motor 8 is continuously rotated by a motor 12, and a crank 13 is fixed to one end of the main shaft 11.
One end is pivoted, and this pivot point is the connection point 1
5 can be freely changed in position along the length of the arm of the crank 13, and can be fixed at any desired location.Normally, a threaded rod 16 is installed in the direction of the arm of the crank 13. One end of the crank rod 14 is pivotally connected to a mover 17 that is screwed into the rod 16, and the mover 17 can be moved in the direction of the arm of the crank 13 by a handle at the outer end of the threaded rod 16. There is.

19 is a fan-shaped gear whose fulcrum is pivotally supported on the machine frame 18 of the bag-making machine 10, and the threaded rod 2 extends in the radial direction.
0, and a slider 21 screwed into threaded rod 20 is movably mounted on the radial guide of sector gear 19, and the other end of the crank rod 14 is pivotally connected to this slider 21. There is. The fan-shaped gear shift of the crank rod 14 is bifurcated in the middle, and the fan-shaped gear 19 is pivotally connected to the mover 21 from both sides. A reversibly rotatable motor 22 is mounted on the threaded rod 20 near the pivot of the sector gear 19 via a suitable transmission mechanism (see FIGS. 3 to 5).

The aforementioned numerals 19 to 22 are mechanical parts of the feed size changing device.

This motor 22 may be directly fixed to the fan-shaped gear 19, but as illustrated in FIG. It is supported by a bearing part 25 integrated with the fan-shaped gear 19, and the short shaft 26 has a universal joint 27.
The vertical short shaft 30 is connected to the bag making machine 1 through a shaft 28 (for example, a coupling made of a spline male shaft and a female shaft) that transmits rotation and expands and contracts in the axial direction, and another flexible joint 29.
This vertical short shaft 30
The motor 22 is connected to the bag making machine 1.
The screw rod 20 is rotated around its axis by the rotation of the motor 22, and the slider 21 screwed therewith is moved upward or downward. Move, sector gear 19
The eccentric dimension of the connecting point between the crank rod 14 and the crank rod 14, that is, the dimension from the fulcrum of the sector gear 19, can be changed, and the reciprocating rotation angle of the sector gear 19 can be changed.

A pinion 31 that meshes with the fan-shaped gear 19 is connected to a pair of sandwiched transfer rollers 33 via a gear and a suitable transmission mechanism 32.
An electromagnetic clutch brake 32 is provided in the middle.

Fa and Fb are bag material bands conveyed in parallel by the common conveyance roller 33, and these are marked with register marks 35 at approximately constant intervals.
a and 35b are respectively indicated, and these bag material bands Fa and Fb are register marks 35a and 35b.
During the stop period, the bags are processed into individual bags by a heat sealer 36, a cutter 37, etc. to form bags Ba and Bb. The order of processing means such as the heat sealer 36 and cutter 37 may be reversed depending on the type of bag making machine, and some machines do not have the cutter 37 and are equipped with a heat sealer 36 that has a hot-nice type fusing and welding function. be.

38a and 38b are mark detection devices, which detect register marks 35 displayed on bag material bands Fa and Fb.
a or 35b during their transfer, and is provided on the machine frame 18 of the bag making machine 10 midway through the transfer path of the bag material bands Fa and Fb.

In the above-mentioned device, the connection point 15 between the crank 13 and the crank rod 14 is manually selected to have an appropriate separation dimension, and the rotation angle at which the transfer roller 33 rotates at one time is set to each of the values displayed on the bag material bands Fa and Fb. By setting the distance between the pitches of the registers 35a and 35b to be slightly larger, the above device detects the mark detection devices 38a and 38a near the end of the transfer stroke.
38b, the clutch of the electromagnetic clutch brake 34 is released, the brake is applied, and the transfer roller 33 is stopped. Further, during the return stroke of the crank 13, the clutch remains disengaged, and when the next forward stroke of the crank 13 begins, the clutch is engaged again.

The above are the prerequisites for the known device mechanism and control device.

In addition to the above-mentioned known devices, the present invention also includes an electric or electronic control device (second invention) which is a control section operated by the mechanical part of the feed size changing device as described below in an embodiment of the specific invention. In this case, a first electrical or electronic control device) C is provided.

That is, the main shaft 1 is continuously rotated by the motor 12.
1 is provided with a synchronous cam 39c, and a proximity switch 39d which emits a signal by this synchronous cam 39c.
A synchronizing signal generating device 40 is provided in the machine frame 18.

The aforementioned cam 39c may not be the main shaft 11 as long as it rotates synchronously with the main shaft 11, or the cam 39c
Even if the above-described crank 13 is used, the present invention is the same. The other two mark detection devices 38
A and 38b, in the figure, there is provided an order judgment circuit 41 which takes as input signals the output signals of the mark detection device 38a and the synchronization signal generation device 40, and judges the order of these signals. A first-come-first-served priority circuit 41 is provided as an example of an order judgment circuit. It is reset by the switch 43 at the same time as the feed stroke ends. The first-come-first-served priority circuit 41 is configured to output the signal that arrives first, and to stop outputting in response to a signal that is input later. Therefore, if the input time difference between the two signals is large, the output signal 44 or 45 will be emitted for a correspondingly long time, and if they are close, the output time will be short.

Among the output signals 44 and 45, one output signal 44 is an output signal that is emitted when the input signal from the synchronization signal generator 40 comes first and the input signal from the mark detection device 38a comes after. The input signal from the synchronization signal generator 40 is the output signal that is generated later, and the input signal closer to the mark detection device 38a is generated first.

Each output signal 4 of the first-come-first-served priority circuit 41
Gate circuits (for example, integrating circuits, time-limited operation timers, or relays) 46, 47 that output an output to the next circuit only when signals 4 and 45 are emitted for a certain period of time or longer;
The motor 22 is rotated in either forward or reverse direction via one-shot elements (time-limited operation timer, relay, etc.) 48 and 49, respectively.

That is, when the output signal is 44, the motor is rotated in the forward direction so that the motor rotates in a direction that reduces the eccentricity of the motor 21, and when the output signal is 45, the motor is rotated in the opposite direction.

In the illustrated example, the outputs of the one-shots 48 and 49 are outputted to the motor 22 by ANDing the synchronizing signal generated by the synchronizing signal generator 40 with the output signal via a binary flip-flop (or cycle counter) 50. Rotate forward or backward.

The above is the control part of the feed size changing device.

(Operation of the first invention) In the example of this invention configured as described above, the main part and operation of the specific invention and the first invention are as follows: A strip of bag material strip Fa is attached to the transfer roller 33. The bag material strip Fa is held between the crank 13 and the crank 13 so that the bag material strip Fa is transferred in one transfer period by a transfer roller 33 that is slightly longer than the pitch between the register marks displayed on the bag material strip Fa. Adjust and fix the connecting point 15 of the crank rod 14.

Next, the position of the mark detection device 38a that detects the register mark as in a normal bag making machine, or
The mark detection device 38a detects the mark by adjusting the position of the guide roller to adjust the length of the path of the bag material strip Fa, and in parallel with the transmission of the synchronization signal generator 40 near the end of one feed stroke of the transfer roller 33. Adjust to emit a detection signal.

When the apparatus of the present invention is operated, first, the order of the signals from both the synchronizing signal transmitting device 40 and the mark detecting device 38a is determined by the order determining circuit 41, and if the signal from the synchronizing signal transmitting device 40 is When the signal 44 is determined to be the later signal by the mark detection signal device 38a, the control device C issues the signal first.
As a result, the motor 22 rotates in the forward direction, moves the slider 21 in a direction where the eccentric dimension becomes slightly shorter, and the fan-shaped gear 1
9 and pinion 31 by increasing the reciprocating rotation angle,
The rotation angle of the transfer roller 33 is increased, and this action is outputted by the gate circuits 46 and 47 when the difference in timing between the synchronization signal generator 40 and the mark detection signal device 38a becomes smaller than a predetermined value. without any of the above signals, the motor 22
stops.

That is, the reciprocating rotation angle of the fan-shaped gear 19 and the pinion 31 is first adjusted by the position of the mover 21 in accordance with the pitch of the register mark 35a.

Next, in response to the output signal of the mark detection device 38a, the electromagnetic clutch brake 34 provided between the pinion 31 and the transfer roller 33 is disengaged, and the transfer roller 33 is braked. Then, the transfer roller 33 is stopped.

When the order of the signals from the synchronizing signal transmitting device 40 and the mark detecting device 38a is reversed to that described above, that is, when the mark detecting device 38a transmits the signal 45 first and the signal from the synchronizing signal transmitting device 40 comes later, The motor 22 rotates in the opposite direction, the eccentricity of the mover 21 increases, and the reciprocating rotation angle of the sector gear 19 and pinion 31 decreases. Other effects are the same as before.

In the above example, the mover 21 operated by the motor 22 was explained as moving the connection point between the sector gear 19 and the crank rod 14. The same applies if it is moved.

However, the moving direction of the moving element 17 with respect to the signals 44 and 45 is exactly opposite to that of the fan-shaped gear 19 and that of the crank 13.

(Effect of the first invention) As shown in the above embodiment, the effect of this specific invention is that the bag making machine automatically adjusts the pitch displayed on the bag material band Fa while the bag making machine is operating. Since the reciprocating rotation angle of the pinion 31 that drives the transfer roller 33 changes, the timing at which the electromagnetic clutch brake 34 is actuated is always at a low point near the end of the feed stroke of the transfer roller 33, depending on the output signal of the mark detection device 38a. Since the brake operates when the vehicle reaches the speed, the braking force of the brake acts effectively, and the amount of slip on the brake part is small, resulting in less unevenness in the distance from when the brake is applied to when the vehicle actually stops.

In addition, the register mark pitch of the bag material band Fa is larger between the winding start part and the winding end part of the bag material belt Fa (for example, the pitch difference is 15 to 20 mm).
Even if there is a dimension, as long as it changes sequentially, the reciprocating rotation angle of the sector gear 19 and the pinion 31 will sufficiently follow the register mark pitch, and as in the conventional known device, the reciprocating rotation angle of the sector gear 19 and the pinion 31 will be different from the transfer roller 33. There is no need to operate the electromagnetic clutch brake 34 to stop the transfer roller 33 before the transfer roller 33 reaches a sufficiently low speed, thereby improving dimensional accuracy and significantly reducing wear and tear on the brake shoes of the electromagnetic clutch.

In addition, in the embodiment of the first invention, the signals 44 and 45 are made to be able to generate output signals through gate circuits represented by integration circuits 46 and 47, respectively, so that the synchronous signal generator 40 When the input signal from the mark detection device 38a and the input signal from the mark detection device 38a are the same or very close to each other, a signal to rotate the motor 22 in the forward or reverse direction is not generated, and the motor 22 simply rotates. To extend the life of a threaded rod 21 and a motor 22 without causing control vibration (heightening) due to excessive tightening. Also, the control device becomes simple.

In the embodiment, the binary flip-flop 50 is used to rotate the main shaft 11 twice, that is,
Since the motor 22 is rotated every time the intermittent transfer is performed twice to change the transfer dimension, control is performed by moving the bag material band Fa forward or backward based on the average value between two pitches of the register mark 35a. Furthermore, the number of control operations for the motor 22 is reduced, allowing for more stable control.

If this binary flip 50 is used in two stages, a control signal will be output once every four times, and if a cycle counter or the like is used, it will be possible to arbitrarily obtain a single output twice or more, making it even slower. control.

(Second Embodiment) As a second invention, in the above-mentioned device, a bag material strip having two or more strips (two strips in the figure)
This is for transferring Fa and Fb in parallel by the common transfer roller 33, and the following devices are loaded on the device of the first invention.

That is, mark detection devices 38a and 38b are provided to detect the register marks 35a and 35b of each bag material strip Fa and Fb, respectively.
While being transferred to Fa, Fb, I came into contact with this,
Braking devices 51a, 51 that apply transfer braking (load)
b are provided independently, and a second electrical or electronic control unit for operating the mark detecting devices 38a, 38b is an order determining circuit (first-come, first-served priority circuit shown in the figure) that determines the order of the output signals of the mark detecting devices 38a, 38b. A circuit) 52 is provided which provides an output signal 53a if the mark detection device 38a detects a mark earlier than the mark detection device 38b, and provides an output signal 53b if the order is reversed. The two output parts of this order judgment circuit 52 are connected to a gate circuit (for example, an integrating circuit, a time-limited operation timer, or a relay) 54 that does not pass the output unless the output exceeds a predetermined value.
The corresponding braking device 51a or 51b is actuated via the one-shot elements (time-limited return timer or relay) 55a, 55b. The order judgment circuit 52 is reset by the synchronization switch 43 of the synchronization cam 42. Preferably, the output emission period of the one-shot element 55a or 55b is the next full transfer period.

(Operation of the second invention) In the second invention configured as described above, the common transfer roller 33 is made to sandwich, for example, two bag material bands Fa and Fb, and each bag material band is
Regarding Fa and Fb, mark detection devices 38a and 38
b in correspondence with the respective registers 35a,
35b are set at positions where they can be detected independently, and the bag making machine of this invention is operated in the same way as the first invention, and the bag material band Fa has exactly the same effect as the above-mentioned specified invention.

In relation to the other bag material band Fb, an order determination circuit 52 determines the order of mark detection signals of the two sets of mark detection devices 38a and 38b.
The braking device 51 acts on the bag material strip Fa or Fb which has issued the preceding signal, causing a slip between the bag material strip Fa or Fa and the transfer roller 33, and By shortening the transfer dimension of the bag material band Fa or Fb, the bag material band with two strips can be used.
Control is performed so that the Fa and Fb register marks 35a and 35b are arranged horizontally in the transverse direction.

Therefore, only the output signals of the synchronization signal transmitting device 40 and one of the mark detection devices 38a are compared, and the rotation angle of the transfer roller 33 is adjusted by moving the slider 21 by the motor 22 so that these signals become simultaneous. As a result, both bag material bands Fa and Fb are transferred in accordance with the register mark pitch by a single transfer roller 33.

(Effect of the second invention) In this second invention, the timing at which the register mark 35a of one bag material band Fa is detected by the mark detection device 38a is compared with the signal from the synchronization signal generator 40. The rotation angle of the transfer roller 33 is controlled so as to approach this, and a control device is provided for the other bag material strips to operate a braking device 51a or 51b to relatively reduce the difference in slow speed. Because there are two bag material bands
For both Fa and Fb, register marks 35a and 35b are detected by mark detection devices 38a and 38b almost at the end of their transfer strokes,
Overall, the control is stable.

In the illustrated example, when the output signal 53a or 53b of the order judgment circuit 52 is a pulse longer than the set time, and the front error of the register mark is larger than the set interval, the braking device 51
Since it is not possible to correct the problem quickly with only the brakes 51a and 51b, a constantly operating brake device 56 is provided, which is separate from the brakes 51a and 51b. This constantly operating type braking device 56 is shown in FIGS. 1, 2 and 8.
As shown in the figure, a large-diameter round bar 57 and a small-diameter round bar 58, which are long enough to hang two bag material bands Fa and Fb, are provided close to each other.
Guide rollers 59 and 60 for determining the positions of the bag material strips Fa and Fb are provided on the machine frame 18 of the bag making machine, respectively, on the loading and unloading sides of the bag material strips 58.
Fa passes over the round bar 58 and is led to the lower side of the round bar 57, and the other bag material band Fb is guided from the lower side of the round bar 58 to the upper side of the round bar 57, and is guided by the guide roller 59 on the carry-in side. A light transfer load is applied to the bag material bands Fa and Fb so that sufficient contact resistance can be obtained for the bag material bands Fa and Fb at the portions where they contact the round bars 57 and 58. In order to further increase this contact resistance, the aforementioned braking devices 51a and 51b may be provided at this guide roller 59. Round bar 58
The bearing 61 is screwed onto a vertical threaded rod 62 and can be moved up or down by a common motor 63.
A constantly operating braking device is provided that can displace the round bar 58 upwardly or downwardly relative to the round bar 57, and by this displacement, for example, if the round bar 58 is raised, a greater braking force is applied to the bag material band Fa. Conversely, the braking applied to the bag material band Fb becomes lighter. Said round bar 5
If 8 is lowered, the effect is reversed.

Such a mechanical always-operating braking device 56
The output signal 53a or 53 of the order judgment circuit 52
When the output of the motor 6 is longer than a certain set time, the time limit operation circuits 54a and 54b operate the motor 6 in response to the respective output signal 53a or 53b.
Since a control circuit is provided to rotate the bar 58 and displace the round bar 58 one step up or down, even if the one step round bar 58 is displaced, the register marks on both sides are still not aligned, resulting in a large misalignment. In some cases, the next similar signal causes the round bar 58 to be displaced one step further.

Two mark detection signals and synchronization signal generator 40
A safety device may be provided to issue a signal 67 to stop the entire device and stop the operation of the bag making machine 10 if the synchronization signal of

As a device for finely adjusting the rotation angle of the transfer roller 33 in the first and second inventions, FIG.
Crank rod 1 as shown in Figures 4 and 5.
4 and the sector-shaped gear 19 by changing the eccentricity dimension, but instead of this device, the device shown in FIG.
As shown in the seventh figure, the mover 17 of the crank 13 is
Rack 66a, 66b which engages with the sun gear 65 is provided on the outer end of the threaded rod 20 in the machine frame 18 so that it can be displaced while the crank 13 is rotating. Activate the front rack 66a or 66b to engage the sun gear 65 and adjust the rotation angle of the transfer roller 33 to the register mark 35a of the bag material band Fa.
The present invention is applicable even if the braking device matches the pitch of the vehicle.

[Brief explanation of the drawing]

Figure 1 is a mechanical side view showing the overall mechanism of the bag making machine, and Figure 2 is a side view of the mechanism of the bag making machine.
3 is a partially omitted mechanical perspective view,
Figure 4 is an enlarged partial vertical side view showing the fan gear mover and displacement mechanism, Figure 5 is an enlarged partial cross sectional plan view showing the relationship between the crank rod and the fan gear, and Figure 6 is another fine adjustment of the rotation angle. 7 is a side view of the crank portion with the device, FIG. 7 is a view taken from the 7-7 arrow line in FIG. 6, FIG. 8 is a longitudinal sectional front view taken from the 8-8 arrow line in FIG. FIG. 10 is a logic circuit diagram of the control section, and FIG. 10 is an operation diagram. Explanation of main symbols in the figure, 40...Synchronization signal generator, 41...Sequence judgment circuit, 42...Synchronization cam, 43...Synchronization switch, 46, 47...Gate circuit, 48, 49...One shot circuit, 50
...Binary flip-flop, 51a, 51
b... Braking device, 52... Sequence judgment circuit, 54
a, 54b...gate circuit, 55a, 55b...
One shot circuit.

Claims (1)

[Claims] 1. A rack that reciprocates in conjunction with a crank rod whose one end is pivotally supported by a crank fixed to a continuously rotating main shaft, a pinion shaft that meshes with one of the fan-shaped gears, and a pair of pinch-type racks. An electromagnetic clutch brake is provided in the middle of the transmission mechanism of the transfer roller, and the clutch is engaged and the brake is released only during the feeding stroke of the crank. one coupling point is provided on a slider that moves along a guide provided in the radial direction of the crank or sector gear, and a threaded rod threadedly engaged with the slider moves along a guide provided in the radial direction of the crank or sector gear. and a feed dimension changing device capable of reversibly rotating the threaded rod to change the eccentric dimension of the slider and change the rotation angle of the transfer roller at one time during operation of the device. in synchronization with the rotation of the main shaft to which the crank is fixed,
Near the end of the crank's feeding stroke, a synchronizing signal generating device for generating an output signal and a mark detecting device for detecting register marks displayed at approximately equal intervals on the bag material strip transferred by the transfer roller are provided. There is an order judgment circuit that takes the output signals of these two devices as input, judges the order of these input signals, and outputs a positive or negative output signal depending on the difference in the cram school. When the time difference is more than a certain time difference, a gate circuit is provided that emits an output signal, and the output signal from this gate circuit is transmitted first, and then the input signal from the synchronization signal generator is input first, and then the input signal from the mark detection device is output. A signal when the signal is later causes the transfer roller to move in a direction to increase the feed size, and a signal when the order of the two input signals is reversed causes the transfer roller to move in a direction to shorten the feed size. A bag material strip transfer dimension control device in a bag making machine, characterized in that a feed dimension changing drive device is provided. 2. A bag material strip transfer dimension control device in a bag making machine according to claim 1, wherein the gate circuit is an integral circuit. 3. The bag material strip transfer dimension control device in a bag making machine according to claim 1, wherein the gate circuit is a type of delay relay or delay timer. 4. A rack that reciprocates in conjunction with a crank rod whose one end is pivotally supported by a crank fixed to a continuously rotating main shaft, a pinion shaft that meshes with one of the fan-shaped gears, and a pair of pinched transfer rollers. An electromagnetic clutch brake is provided in the middle of the transmission mechanism, and the clutch is engaged and the brake is released only during the crank feed stroke. A dot is provided on a slider that moves along a guide provided in the radial direction of a crank or a fan-shaped gear, and a threaded rod that is threadedly engaged with the slider is provided in the radial direction of the crank or sector-shaped gear. In the device having a feed dimension changing device that can reversibly rotate the threaded rod to change the eccentricity dimension of the mover during operation, and change the rotation angle at which the transfer roller rotates at one time, the paired clamp type On the transfer path of multiple strips of bag material that are transferred in parallel by the transfer rollers, mark detection devices are installed independently to detect register marks displayed at regular intervals on each of these strips of bag material. A synchronizing signal generating device is provided which is synchronized with one of these mark detecting devices and the main shaft to which the crank is fixed, and which emits an output signal near the end of the crank's feed stroke. An order judgment circuit is provided that takes an output signal as an input signal, judges the order of these input signals, and outputs a positive or negative output signal depending on the difference in this order, and the time difference between this and the two input signals is constant. A gate circuit is provided to generate an output signal when the time difference is greater than or equal to the time difference, and an output signal is generated from this gate circuit. The signal operates the feed size changing device in a direction to increase the feed size of the transfer roller, and when the order of the two input signals is reversed, the feed size changing device operates to shorten the feed size of the transfer roller. A feed dimension changing drive device is provided which operates in the direction of the feed dimension change drive device, and a braking device is provided which independently contacts each bag material strip and applies a transfer load, and this device is connected to the plurality of mark detection devices. A bag material strip transfer size control device for a bag making machine, characterized in that the braking device corresponding to the mark detection device that first issues the mark detection signal is applied during the next transfer period. 5. The bag material strip transfer dimension control device in a bag making machine according to claim 4, wherein the gate circuit is an integral circuit. 6. The bag material strip transfer size control device according to claim 4, wherein the gate circuit is one of a delay relay and a delay timer.