JPS5847499B2 - Electromagnetic needle selection device for hand knitting machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in electromagnetic control means for a needle selection device in a hand knitting machine.

Conventionally, there has been a technology that uses an electromagnet as an electric control means to selectively control the needle selection plate of a knitting machine in response to a needle selection pattern signal via a punch card or the like. In order to control the selected needle selector plate to its operating position, the control element was activated by the attraction force of the electromagnet, which caused a harsh impact sound when the electromagnet was activated, and the necessary attraction force was not obtained. This requires an electromagnet with a considerable capacity, and as a result, the device is large and heavy, consumes considerable power and generates heat, and is also difficult to respond to, from the timing of the electrical signal given to the electromagnet to the needle selection plate control. Sex wasn't always enough either.

The purpose of the present invention is to solve the problems of the prior art as described above. In the present invention, the electromagnet does not directly attract or operate the needle selection plate or its control element by its operation, but rather Electromagnets selected according to the pattern signal are energized to respond to the needle selection plate, which is sequentially displaced to the working position in conjunction with the knitting needles that are pushed down with the lateral movement of the carriage. This is to hold the needle selection plate in its working position, and one important point here is
When the electromagnet is activated, the plunger of the electromagnet is not attracted and takes an impulse stroke, but the member equivalent to the needle selection plate is moved sequentially in conjunction with the depression of the knitting needle, and the moved position remains unchanged. An electromagnet is used to selectively hold the needle, and since the electromagnet only holds the needle and does not act on the suction stroke, an electromagnet with a significantly smaller capacity than the previous examples can be used to create an electromagnetic needle selection control device with good characteristics. It is characterized by what it did.

That is, the gist of the present invention is a structure in which knitting needles, needle selection plates, and electromagnets are mechanically and electromagnetically related, and synchronized with the movement of the carriage from a pattern signal via a punch card or the like. The structure of the part where the electromagnet is selectively excited by
The example of the prior art can be used as is.

As a conventional example of such electromagnetic needle selection control, Japanese Patent Application Laid-Open No. 50-70
The following explanation will be given by comparing the example from No. 644 with the above example.

Although FIG. 1 schematically shows the conventional example as a control system diagram, it is noted that the former block 1, which is divided into two blocks 1 and 2 for convenience, is also common to the present invention. Figure 2 shows.

However, in order to understand the operation of the rear stage block 2' of the present invention, the entire control system including the front stage block 1 will be briefly explained.

The systems connected by broken lines in the figure indicate the mechanical connection or interlocking relationship.As the carriage of the hand knitting machine is operated to slide horizontally on the needle, first, when the direction of carriage movement is changed, the punch card The signals for one knitting row are sent in parallel to the reading device 5 via the interlocking means 4 of the step feed, which sends the pattern signal 3 for one row.

Next, when the carriage is operated laterally, the knitting needles 6 are sequentially pushed down as the carriage advances by the action of a push-down cam provided on the carriage, and return upward as the carriage passes.

In conjunction with the sequential depression of these knitting needles, a group of selector switches 7 are sequentially closed and opened by a synchronous interlocking stage 8.

In the selector switch 7, a number of switches corresponding to the number of signals for one stage of the pattern signal 3 are sequentially connected in parallel at a predetermined arrangement period on the output side, and are connected to the carriage position via a synchronous interlocking stage 8. As the synchronized switcher 9 moves, the switch groups are always closed in a series of several adjacent ones, and each switch is opened as the switcher 9 moves apart.

Thereby, the selector switch 7 plays a role of distributing each of the parallel outputs of the reading device 5, which are read out in parallel from the pattern signal 3 every row, to the output end in synchronization with the carriage position and in an overlapping manner for several depletion signals. The details are based on the example found in the above-mentioned publication.

The output signals thus obtained from the pre-stage block 1 cause the electromagnets 10 to be activated sequentially and selectively depending on the presence or absence of the signal.

Therefore, in the case of the conventional technology, when the electromagnet 10 is excited, the action is to directly pull the needle selection plate 11 toward the knitting needles 6 that are pushed down as the carriage advances, as described above. When a plurality of needle selection plates 11 arranged corresponding to each electromagnet 10 are selectively moved by the electromagnet 10, the engager 11a on the needle selection plate engages with the knitting needle 6 in the depressed state. The needle selection cam (not shown) provided on the carriage sequentially engages the knitting needle 6 in the push-down position as usual to provide a needle selection action.

That is, in this example, the needle selection plate 11, which is operated by being attracted by the electromagnet 10, has a single function of holding the selected knitting needle in its depressed position.

In the latter block 2' in the case of the present invention, as will be described in detail later, the electromagnet 18 is energized to move the needle selection control plate 12.
The needle selection control board 12 has a different structural role from the needle selection board 11 described above, and when the knitting needle 6 is pushed down as the carriage advances, the needle first moves through the needle selection control board 12. At that time, the electromagnetic plunger connected to the needle selection control board 12 is moved to its attracted operation position, and the interlocking movement from the knitting needles 6 to the electromagnetic plunger via the needle selection control board 12 is such that the knitting needles 6 return to the upper position. However, when the knitting needle 6 is in the depressed position, that is, the electromagnetic plunger is in the original sucked position,
The output signal of the front block 1 excites the electromagnet 18 in synchronization with this, and therefore, the plunger of the excited electromagnet 18 is simply held in the attracted state without performing an impulse stroke again, and its holding state is maintained. Force is needle selection control board 1
2 and the knitting needles engaged therewith are also held in a depressed state to perform the needle selection function as in the prior art.

The detailed configuration of the present invention will be explained below.

In FIG. 3, knitting needles 6 are arranged in a row on the needle bed 13 so as to be movable back and forth, and the knitting needles 6 are normally kept at the position shown by the two-dot chain line upwardly under the bias of the leaf spring 14.

When the carriage 15 is operated, the push-down cam 16 pushes it down to the push-down position shown by the solid line.

As shown in FIG. 4, the push-down cam 16 sequentially pushes down the knitting needles 6 along its string arc, and upon passing, the knitting needles 6 are returned upward by the leaf springs 14.

A needle selection control plate 12 is disposed at right angles to and behind the knitting needles 6, and the rear end of a connecting rod 17 extending from the rear needle selection control plate 12 is engaged with a plunger 19 of an electromagnet 18.

As shown in FIG. 5, the connecting rods 17 are combined one-to-one with the needle selection control plates 12, and the corresponding needle selection control plates 12 penetrate through the small holes 20 and engage with the corresponding needle selection control plates 12. The control plate 12 fits loosely into a window hole 21 provided on the plate side, so that mutual movement is not hindered.

The middle of the connecting rod 17 is pivotally supported by a fulcrum hole 23 passing through a support plate 22, and the longitudinal direction of the connecting rod 17 is regulated by a needle bed support plate 24 and an electromagnetic support plate 25. .

The needle selection control plate 12 is supported by a holding rod 26 so as to be movable horizontally in parallel, and the amount of movement in the left and right directions is limited by a slot 27 into which one of the holding rods 26 fits, and biased to one side by a spring 28.

The needle selection control board 12 includes a plurality of interlocking parts 29 disposed along the entire length of the needle bed 13 and below the knitting needles 6 so as to be able to engage with the rear ends of the corresponding knitting needles in a pinch of a predetermined number of knitting needles. There is.

The number of knitting needles at this predetermined pitch corresponds to the number of electromagnets 18, and each needle selection control board 12 is arranged so that the interlocking parts 29 on the roots of the adjacent knitting needles 6 are sequentially shifted by one stitch of the knitting needles 6. It is something that will be placed.

As shown in detail in FIGS. 6 to 8 along with its functions,
Each interlocking part 29 has a cam groove 29a extending diagonally in the F direction from the inlet located below the tail end 6a of the knitting needle 60 when the needle selection control plate 12 is pulled by the spring 28 and is in the inactive rest position. It is formed.

The groove width of the cam groove 29a is sufficient to allow the knitting needle tail end 6a to slide in and receive the knitting needle tail end 6a without any trouble when it descends as shown by arrow A.
A cam portion 29b that engages with A and operates the needle selection control plate 12 in the direction of arrow B against the spring 28 by the action of the wedge cam.
is formed, and on the upper side there is a presser foot which presses down the knitting needle tail end 6a from above and holds it at the position 6a' when the needle selection control plate 12 is operated and held at the operating position 12'. A trunnion 29c is formed that acts as a cam.

Further, the trunnion 29c side of the inlet of the cam groove 29a is shaved off to facilitate entry of the knitting needle tail end 6a.

In this way, the interlocking part 29a displaces the needle selection control plate 12 from the rest position to the operating position 12' at right angles to the knitting needle 6 when the corresponding knitting needle 6 is lowered. If not added, the knitting needles 6 will be returned to their original positions by the return spring of the leaf spring 14 and the needle selection control plate 12 will be returned to their original positions by the restoring force of the spring 28 as the push-down cam 16 passes.

During this period, the reciprocation of the needle selection control board 12 to the operating position 12' is transmitted to the plunger 19 by the connecting rod 17, and during the outward movement, the plunger 19 moves in the direction of the suction stroke of the electromagnet 18, and during the return movement, the plunger 19 moves in the direction of the attraction stroke of the electromagnet 18. moves in the direction in which it wants to separate from the electromagnet 18.

The electromagnet 18 does not exert any restraining action on the movement of the plunger 19 in and out unless it is energized. The closing timing synchronized with the movement of the carriage of the selector switch 7 in the front block 1, that is, the movement of the push-down cam, is given in the vicinity of the bottom dead center when the corresponding knitting needle 6 is pushed down. When the electromagnet 18 is excited in this state with the knitting needle position 6a/, the plunger 19 remains sucked in the same position, and the electromagnetic force is applied to the needle selection control board by the force of the spring 28. 12 is held in the operating position 12', thereby the knitting needle 6 is held in the depressed position 6a', and the selector switch 7 is such that the switcher 9 always closes a plurality of switches in series. As shown in FIG. 8, the knitting needles 6 once gripped by the interlocking part 29 are maintained in the gripped state for several knitting needles even when the push-down cam 16 passes overhead, and during this time the needle selection (not shown) is performed. The action of the cam produces front and rear needle selection.

Therefore, by operating the carriage 15, the push-down cam 16 moves the knitting needle 6.
When moving back and forth on the rows of , the needle selection control board 12 is sequentially pulled out to the operating position 12' in conjunction with the knitting needles 6, and the needle selection control board 12 is sequentially pulled out to the operating position 12', and the needle selection control board 12 is sequentially pulled out to the operating position 12' according to the correspondence relationship given by the reading device 5 to the signal to be selected. The electromagnet 18 is selectively excited, and the needle selection control plate 12 is controlled to remain in place to produce a needle selection action.

When the selector switch 7 is released from the electromagnetic operating state shown in FIG. 8, the knitting needles 6 are released from the restraint by the interlocking part 29 and return upward.

As explained above, the role of the electromagnet 18 of the present invention is to attract and hold the plunger, which approaches in the direction of the suction stroke in conjunction with the depression of the knitting needle 6, under selective excitation control. Since this is different from a device that activates suction from a plunger that has been at rest, it does not require a large output capacity and only requires a small device, thereby reducing the weight and volume of the needle selection device as a whole. be.

Furthermore, the operational response of the electromagnet 18 to the closing timing of the selector switch 7 is also better because there is no suction operation load on the plunger 19.

In relation to the fact that the use of a small electromagnet is sufficient, let us explain the example of FIG. The ratio l2/l1 is set to be slightly larger than 1 so that the stroke of the plunger 190 is the same as the amount of movement of the needle control plate 12.

As a result, when the plunger 19 is in the rest position with a large stroke as shown on the left side of the figure, even if the electromagnet 18 is excited due to a timing difference, the force of the electromagnetic force acting on the plunger 19 is weaker, so the knitting needle The interlocking gripping action between the interlocking portion 6 and the interlocking portion 29 is less likely to be adversely affected, and the action becomes more stable.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a control system of a conventional device in comparison with the present invention, Fig. 2 is a schematic diagram of the same system of the present invention, showing only the characteristic parts of the invention, and Fig. 3 and subsequent figures show examples. 3 is a side sectional view of the device, FIGS. 4 and 5 are configuration diagrams of the main parts, FIG. 4 is a partial layout view from the front, and FIG. 5 is a partially enlarged planar sectional view. It is. 6 to 8 are explanatory views of the operation, and FIG. 9 is a partially modified embodiment corresponding to FIG. 5. 3...Pattern signal, 5...Reading device, 6
...Knitting needle, 6a...Knitting needle tail end, 8...
... Synchronization interlocking means, 10 ... Conventional electromagnet, 12 ... Needle selection control board, 15 ... ...Carriage, 16...Press cam, 17...
・Connecting rod, 18... Electromagnet, 19...
Plunger, 23...Fully hole of connecting rod, 29.
...Interlocking part, 29a...Cam groove, 29b
...Cam part, 29c...Trunion.

Claims (1)

[Scope of Claims] 1. A pattern signal read from a signal recording medium is periodically and sequentially distributed to an output end in synchronization with the movement of a carriage, and an electromagnet disposed at the output end is selected according to the pattern signal. In a needle selection device of a hand knitting machine, which selectively holds knitting needles that are sequentially pushed down in accordance with the movement of the carriage at the depressed position by controlling excitation, when the knitting needle is depressed, interlocking parts each formed with a cam groove that engages with the knitting needle tail end and causes the knitting needle tail end to actuate at right angles to the push-down by a cam action, and that restrains and holds the knitting needle tail end when the knitting needle tail end is held in the operating position; Needle selection control boards are arranged at a pitch of the number of knitting needles corresponding to the number of electromagnets, and the electromagnets The same number of knitting needles are arranged in parallel, each pair of the needle selection control board and the electromagnet are moved in series via a connecting rod, and the electromagnet is selectively excited when the knitting needle is in a depressed state. Electromagnetic needle selection device. 2. The connecting rod has a length that extends from the fulcrum to the engagement point on the electromagnet plunger side, relative to the length of the needle selection control plate and the electromagnet from the intermediate fulcrum to each engagement point. The electromagnetic needle selection device according to claim 1, wherein the electromagnetic needle selection device is pivoted so that one of the two needles is longer than the other. 3. The cam groove of the interlocking part is shaped diagonally downward by the cam part on the lower side and the trunnion on the upper side, and the upper inlet part is formed by cutting off the trunnion side. An electromagnetic needle selection device according to claim 1 or 2.